JP2019176792A - Work vehicle - Google Patents

Abstract

[PROBLEMS] To improve workability.
A work vehicle according to an embodiment is provided in a traveling vehicle body 2, and a plurality of loading platforms 51 on which work materials are loaded are stacked in a multi-tiered state, and a deployed state in which the stacked state is deployed linearly from the stacked state. And a loading unit 50 that can be switched between. The loading unit 50 fixes the work material loaded on the loading table 51 in the stacked state on the loading table 51, and releases the work material loaded on the loading table 51 in the unfolded state.
[Selection] Figure 2A

Description

  The present invention relates to a work vehicle.

  Conventionally, in a working vehicle such as a seedling transplanting machine for planting seedlings while traveling in a field, a vehicle equipped with a loading part on which work materials such as mat seedlings and fertilizer bags are placed on either the left or right side of the traveling vehicle body or both sides. Are known. Some of these stacking units are capable of switching between a stacked state in which a plurality of loading platforms are vertically arranged in a plurality of stages and overlapping in a plan view and a deployed state in which the plurality of loading platforms are linearly expanded in the front-rear direction (for example, , See Patent Document 1).

JP 2013-45 A

  Here, in the scene where the loading unit is used, for example, the work assistant loads the working material from the loading unit in the unfolded state, and the worker receives the working material on the machine body and inputs the received working material to a predetermined location. As a result, workability is improved.

  However, in the conventional work vehicle as described above, when work material is placed on the loading platform of the stacking unit in the stacked state, the work material may slide down from the loading platform due to vibration or tilt of the machine during work, In addition, if the work material is heavy, it may be difficult to load the work material on the loading table of the loading unit in the unfolded state, and workability is reduced.

  The present invention has been made in view of the above, and an object thereof is to provide a work vehicle capable of improving workability.

  In order to solve the above-described problems and achieve the object, the work vehicle (1) according to claim 1 is provided on the traveling vehicle body (2) and includes a plurality of loading platforms (51) on which work materials are loaded. A stacking portion (50) capable of switching between a stacked state in which the upper and lower layers are stacked and an unfolded state in which the stacked state is expanded linearly is provided, and the stacking portion (50) includes the stacking platform (51) in the stacked state. The working material loaded on the loading table (51) is fixed on the loading table (51), and the working material loaded on the loading table (51) in the unfolded state is released.

  The work vehicle (1) according to claim 2 is the work vehicle (1) according to claim 1, wherein the loading portion (50) is deployed in the loading platform (51) of the work material in the deployed state. A movement assisting part (53) for assisting movement in the direction, wherein the movement assisting part (53) receives the work material loaded on the loading platform (51) in the stacked state of the loading part (50). The working material is fixed on the loading platform (51), and the working material loaded on the loading platform (51) is unfixed in the unfolded state of the loading section (50).

  The work vehicle (1) according to claim 3 is the work vehicle (1) according to claim 2, wherein the movement assisting portion (53) is provided on a bottom surface (512) of the loading platform (51), It moves below the bottom surface (512) of the loading table (51) in the stacked state, and moves above the bottom surface (512) of the loading table (51) in the unfolded state. .

  The work vehicle (1) according to claim 4 is the work vehicle (1) according to claim 3, wherein the loading unit (50) changes the posture between the stacked state and the deployed state. A frame (52) for supporting (51), wherein the movement assisting portion (53) is pushed up against the frame (52) in the unfolded state, and is separated from the frame (52) in the stacked state. It is characterized by that.

  The work vehicle (1) according to claim 5 is provided in the work vehicle (1) according to any one of claims 1 to 4 so as to be freely retractable on left and right sides of the traveling vehicle body (2). At the same time, the distal end portion (12a) is detachably attached to the base, and when the traveling vehicle body (2) travels in the field, a traveling reference line is formed in the farm scene as the traveling vehicle body (2) travels. A marker (12) is further provided, and the stacking part (50) includes a marker holding part (55) for holding the tip part (12a) of the marker (12).

  According to the first aspect of the present invention, since the work material is fixed to the loading table in the stacked state of the loading unit, the work material is prevented from sliding off the loading table even when the machine body is working. Can do. In addition, since the working material is released from being fixed in the unfolded state of the loading portion, the work material can be loaded easily. That is, workability can be improved.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the work material released from being fixed in the unfolded state of the loading unit is smoothly moved on the loading table by the movement assisting unit. The work material can be loaded better. In addition, since the work material is fixed to the loading table by the movement assist unit in the stacked state of the loading unit, it is possible to prevent the work material from sliding off the loading table even when the machine is working. In the expanded state of the part, the work material is unfixed, so that the work material can be easily loaded. That is, workability can be improved.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, the work auxiliary material is loaded by its own weight by moving the movement auxiliary portion below the bottom surface of the loading table in the stacked state. The movement assisting portion is stabilized on the table and moved upward from the bottom surface of the loading table in the unfolded state, so that the movement of the work material is assisted by being interposed between the bottom surface and the work material. Thereby, it is possible to prevent the work material from slipping off from the loading platform in the stacked state, and in the unfolded state, the work material can be easily loaded and workability can be improved.

  According to the fourth aspect of the invention, in addition to the effect of the third aspect of the invention, the movement assisting portion can be moved forward and backward with respect to the bottom surface of the loading table by a frame whose posture is changed between the stacked state and the unfolded state. It becomes. Specifically, in the unfolded state, the movement assisting unit abuts on the frame and is pushed up to project upward from the bottom surface of the loading table, and in the stacked state, the moving member moves away from the frame and below the bottom surface of the loading table. Retract. Thereby, a movement auxiliary | assistant part can be act | operated reliably according to the state of a loading part.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, when the marker is not used, the tip part is stored in the loading part which is a part of the fuselage. It is possible to prevent the marker (tip portion) from being lost.

FIG. 1 is a schematic left side view illustrating an example of a work vehicle according to the embodiment. FIG. 2A is a schematic left side view illustrating a stacked state and a deployed state of the stacking unit. FIG. 2B is a schematic plan view showing when the stacking unit is unfolded. FIG. 3A is a schematic left side view showing a stacking state and an unfolded state of a modified example (part 1) of the stacking unit. FIG. 3B is a schematic enlarged perspective view of a part A in FIG. 3A. FIG. 4 is a schematic left side view showing the auxiliary stacking unit. FIG. 5 is a schematic left side view showing a modification of the auxiliary stacking unit. FIG. 6 is a schematic left side view showing the marker holding unit. FIG. 7A is a schematic plan view (part 1) illustrating a floor step and an expansion step. FIG. 7B is a schematic plan view (part 2) illustrating the floor step and the expansion step. FIG. 8 is a schematic perspective view showing the expansion step. FIG. 9A is a schematic perspective view showing a floor step and an expansion step. FIG. 9B is an end view taken along line BB in FIG. 9A. FIG. 10 is an explanatory diagram of a detachable handrail, (a) a plan view of the handrail, (b) a side view of the handrail, and (c) a rear view of the handrail. FIG. 11 is an explanatory diagram of an attachment part of a detachable handrail. FIG. 12 is an explanatory diagram of attachment of a detachable handrail. FIG. 13 is an explanatory diagram of a fixed handrail, (a) a plan view of the handrail, (b) a side view of the handrail, and (c) a rear view of the handrail. FIG. 14 is an explanatory diagram of the periphery of a loading unit and a fertilizer application device according to another modification. FIG. 15A is a block diagram illustrating each part related to notification control (part 1) by the control unit. FIG. 15B is a block diagram illustrating each part related to notification control (part 2) by the control unit. FIG. 16A is an explanatory diagram (No. 1) of a rear wheel swing restricting structure. FIG. 16B is an explanatory diagram (part 2) of the rear wheel swing regulating structure. FIG. 17A is a schematic left side view showing a seedling inlet and a spacer for densely seeding seedlings. FIG. 17B is a schematic rear view showing a seedling inlet and a spacer for densely seeding seedlings. FIG. 18A is a schematic left side view showing a seedling inlet and a spacer for densely seeding seedlings. FIG. 18B is a schematic plan view showing a seedling inlet and a spacer for densely seeding seedlings. FIG. 18C is a schematic rear view showing a seedling inlet and a spacer for densely seeding seedlings. FIG. 19A is a schematic left side view showing a modified example of the seedling inlet and the spacer for densely seeding seedlings. FIG. 19B is a schematic plan view showing a modified example of the seedling inlet and the spacer for densely seeding seedlings. FIG. 19C is a schematic rear view showing a modified example of the seedling inlet and the spacer for densely seeding seedlings.

  Hereinafter, an embodiment of a work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

<Overall configuration of work vehicle (seedling transplanter) 1>
With reference to FIG. 1, the whole structure of the working vehicle (seedling transplanter) 1 which concerns on embodiment is demonstrated. FIG. 1 is a schematic left side view illustrating an example of a work vehicle (seedling transplanter) 1 according to an embodiment. In the following, as a working vehicle 1 according to the embodiment, a seedling transplanting machine for planting seedlings on a topsoil surface (a field scene) of a field while traveling in the field will be described as an example.

  Moreover, in the following description, the front-rear direction is a traveling direction when the seedling transplanter 1 as a work vehicle is traveling straight, and the front side in the traveling direction is defined as “front” and the rear side is defined as “rear”. . The advancing direction of the seedling transplanter 1 is a direction from a cockpit 9 (to be described later) toward the steering handle 10 during straight travel (see FIG. 1).

  The left-right direction is a direction that is horizontally orthogonal to the front-rear direction. In the following, left and right are defined toward the “front” side. That is, the left hand side is “left” and the right hand side is “right” in a state where an operator (also referred to as a pilot) is seated on the cockpit 9 and faces forward. Further, the vertical direction is the vertical direction. The front-rear direction, the left-right direction, and the up-down direction are orthogonal to each other.

  Note that these directions are defined for convenience in order to make the explanation easy to understand, and the present invention is not limited by these directions. In the following, the seedling transplanter 1 may be referred to as “airframe”.

  As shown in FIG. 1, the seedling transplanter 1 includes a traveling vehicle body 2 that can travel in a field. The traveling vehicle body 2 includes a pair of left and right front wheels 3 and a pair of left and right rear wheels 4. The traveling vehicle body 2 is, for example, a four-wheel drive in which the front wheels 3 and the rear wheels 4 are driven. A seedling planting unit 30 that is driven up and down by the lifting device 20 is provided at the rear of the traveling vehicle body 2.

  The traveling vehicle body 2 includes a body frame 5, an engine E provided on the body frame 5, and a power transmission device 6 that transmits power generated by the engine E to the drive wheels and the seedling planting unit 30. That is, the power generated by the engine E that is a power source is used not only for moving the traveling vehicle body 2 forward or backward, but also for driving the seedling planting unit 30.

  The engine E is arranged at a center portion of the traveling vehicle body 2 in the left-right direction and at a position protruding above the floor step 7 on which an operator who has boarded the traveling vehicle body 2 puts his / her foot. As the engine E, a heat engine such as a diesel engine or a gasoline engine is used. The floor step 7 is provided at the front portion of the traveling vehicle body 2 in the front-rear direction. The floor step 7 is provided from the front part of the traveling vehicle body 2 to the rear part of the engine E.

  The floor step 7 is mounted on the body frame 5. Of the floor step 7, for example, a part of the vicinity of the cockpit 9 described later is formed in a lattice shape in plan view so that mud or the like adhering to the operator's shoes can be dropped on the farm field. A rear step that also serves as a fender for the rear wheel 4 may be provided at the rear of the floor step 7.

  The engine E is covered with an engine cover 8. A cockpit 9 is provided above the engine cover 8. The power transmission device 6 includes a belt type power transmission unit 6a to which power is transmitted from the engine E, and a hydraulic continuously variable transmission that is a transmission for shifting power transmitted from the engine E through the belt type power transmission unit. And a mission case 6b.

  The hydraulic continuously variable transmission is, for example, a hydrostatic continuously variable transmission called HST (Hydro Static Transmission). The hydraulic continuously variable transmission can change the output (rotation speed) and the output direction (rotation direction) by operating the main transmission lever. In other words, the hydraulic continuously variable transmission can change the forward and backward travel and the traveling speed of the traveling vehicle body 2 by changing the rotational speed and the rotational direction.

  The transmission case 6b is provided with a transmission device that transmits the power from the engine E, which is changed by the hydraulic continuously variable transmission, to each part. The mission case 6b includes a sub-transmission mechanism that switches the traveling speed during traveling and working. When the sub-shift lever is operated, the mission case 6b switches the traveling speed of the traveling vehicle body 2 to, for example, a traveling speed higher than the traveling speed at the time of planting, a seedling planting speed at the time of planting, or the like. Is possible.

  As shown in FIG. 1, the traveling vehicle body 2 includes a cockpit 9 on a floor step 7. The cockpit seat 9 is a seat on which an operator is seated during steering. The traveling vehicle body 2 includes a steering handle 10 and a planting lever in front of the cockpit 9. The steering handle 10 is provided on the bonnet 11 of the traveling vehicle body 2 and is operated by an operator to steer the traveling vehicle body 2. The planting lever is a clutch lever, and is a lever that is provided on the bonnet 11 and operates to raise and lower the seedling planting unit 30 and to start and stop planting seedlings by the seedling planting unit 30.

  The traveling vehicle body 2 includes a main transmission lever and a sub transmission lever. The main transmission lever (also referred to as HST lever) is a lever that is operated when the vehicle body 2 moves forward and backward and the traveling speed is changed. The auxiliary transmission lever is a lever that is operated when the traveling speed of the traveling vehicle body 2 is switched to a speed corresponding to a traveling place (a field or a road).

  The bonnet 11 is provided so as to protrude upward from the floor step 7 and is covered with a front cover 11a. The bonnet 11 is provided with a display unit (meter panel), for example. The display unit has a display surface inclined downward so as to face an operator who is seated in the cockpit 9 and facing forward.

  The display unit is, for example, a marker sensor for detecting that a marker 12 (see FIG. 6), which will be described later, which forms a travel reference line that serves as a guide for straight traveling in a field scene, is on the left and right sides of the traveling vehicle body, and a planting lever A planting lever position sensor for detecting the operation position of the fertilizer, a fertilizer running sensor for detecting that the fertilizer stored in the storage hopper 41 of the fertilizer application device has fallen below a predetermined amount, and the fertilizer sent from the storage hopper 41 in the supply path Information from various sensors such as a fertilizer clogging sensor that detects clogging is displayed.

  As shown in FIG. 1, the seedling transplanter 1 includes an elevating device 20 and a seedling planting unit 30. The lifting device 20 includes a lifting link 21. The elevating link 21 is a parallel link that connects the rear portion of the traveling vehicle body 2 and the seedling planting portion 30, and rotates in the vertical direction with respect to each of the link frame and the seedling planting portion 30 at the rear portion of the traveling vehicle body 2. By being connected freely, the seedling planting part 30 is connected to the traveling vehicle body 2 so as to be movable up and down.

  The lifting device 20 includes a hydraulic lifting cylinder 22. The elevating cylinder 22 is expanded and contracted by operating the planting lever and switching the hydraulic valve. The raising / lowering cylinder 22 drives the raising / lowering link 21 by extending / contracting, and raises / lowers the seedling planting part 30. That is, the elevating cylinder 22 is switched to a non-working position where the seedling planting part 30 is raised and a ground work position (planting position) where the seedling planting part 30 is lowered by operating the planting lever.

  The seedling planting part 30 is attached to the rear part of the traveling vehicle body 2 via the lifting link 21 as described above. The seedling planting unit 30 can plant seedlings in a plurality of rows (rows), for example. The seedling planting unit 30 includes a seedling placement table 31, a float 32, and a planting device 33.

  The seedling placement table 31 has as many seedling placement surfaces as the number of planting strips in the left-right direction of the machine body. Each seedling placement surface is a rearwardly inclined surface on which a plurality of mat seedlings (mat seedlings with soil) can be placed in the vertical direction. The float 32 levels the ground while sliding on the field scene of the field (paddy field) as the traveling vehicle body 2 moves. The float 32 includes a center float disposed in the center of the body in the left-right direction of the body and a side float disposed outside in the left-right direction across the center float. In the illustrated example, the seedling transplanter 1 further includes a leveling rotor 13 that is a leveling device.

  Each float (center float and side float) of the float 32 is rotatably attached to the traveling vehicle body 2 such that the front part moves up and down according to the unevenness of the farm scene. For example, the planting device 33 detects the vertical movement of the center float with a rotation sensor for controlling the angle of attack. In the seedling planting unit 30, the vertical movement of the front part of the center float is detected by the rotation sensor during planting work, and the control unit 100 (see FIGS. 15A and 15B) described later according to the detection result of the rotation sensor. The seedling planting portion 30 can be raised and lowered by switching the hydraulic valve that controls the expansion and contraction operation of the lifting cylinder 22 to adjust the seedling planting depth.

  The planting device 33 is arranged below the seedling placement table 31 by being supported by the planting support frame of the seedling placement table 31. The planting device 33 plants the seedling placed on the seedling placing table 31 in the field. The planting device 33 includes a planting basket 331, a rotary case 332, and a planting transmission case 333. The planting basket 331 takes seedlings from the mat seedlings placed on the seedling placement table 31 and plants them in the field scene. The planting basket 331 is rotatably connected to the planting transmission case 333.

  The rotary case 332 rotatably supports the planting basket 331 and is rotatably coupled to the planting transmission case 333. The rotary case 332 is provided with an inconstant speed transmission mechanism that can rotate the implantation rod 331 while changing the rotation speed of the implantation rod 331. The implantation rod 331 rotates while changing the rotation speed depending on the rotation angle with respect to the rotary case 332. The planting transmission case 333 transmits the power transmitted from the engine E to the seedling planting unit 30 to the planting basket 331.

  As shown in FIG. 1, the seedling transplanter 1 includes a fertilizer application device 40. The fertilizer application device 40 is a device that spreads fertilizer on a farm field. In the seedling transplanter 1, fertilizer is sprayed on the field by the fertilizer application device 40 while seedlings are planted on the field by the seedling planting unit 30. The fertilizer application 40 is provided, for example, above the rear part of the traveling vehicle body 2 and behind the cockpit 9. The fertilizer application device 40 includes a storage hopper 41 that stores fertilizer.

  As shown in FIG. 1, the seedling transplanter 1 includes, for example, a loading portion (also referred to as a preliminary seedling placement portion) 50 on either the left or right side or both sides on the front side of the traveling vehicle body 2. The loading unit 50 includes a plurality of loading platforms 51. The loading platform 51 has a pallet shape and includes a pair of side walls 511 and a bottom surface 512 (see FIG. 2B). The loading unit 50 is configured to be able to switch between a stacked state in which a plurality of loading platforms 51 are arranged in a plurality of stages and overlapping in plan view, and a deployed state in which the plurality of loading platforms 51 are linearly expanded in the front-rear direction, for example. Is done.

<Loading unit 50>
Next, the stacking unit 50 will be further described with reference to FIGS. 2A and 2B. FIG. 2A is a schematic left side view showing a stacked state and a developed state of the stacking unit 50. FIG. 2B is a schematic plan view showing the loading unit 50 when unfolded. Note that FIG. 2A shows both the stacked state and the unfolded state of the stacking unit 50. As described above, the seedling transplanter 1 (see FIG. 1) has a replenishing seedling (preliminary seedling) and fertilizer on the left or right or both sides of the front part of the traveling vehicle body 2 (see FIG. 1). A plurality of loading platforms 51 (51a, 51b) on which work materials such as fertilizer bags are loaded are loaded.

  As shown in FIG. 2A, as described above, the stacking unit 50 includes a plurality of (for example, two) stacking bases 51 (51a, 51b) stacked in an overlapping manner with upper and lower multi-stages (for example, two stages). It is possible to switch between the unfolded state in which the loading platforms 51a and 51b in the stacked state are unfolded linearly. Here, in the stacked state, the stacking unit 50 is arranged above the rear stacking platform 51b in which the front loading platform 51a is fixed in position. In the unfolded state, the stacking unit 50 is disposed in front of the rear loading platform 51b with the front loading platform 51a moving forward. In the example shown in FIGS. 2A and 2B, the stacking unit 50 is configured to expand in the front-rear direction. However, for example, the stacking unit 50 may be configured to expand in the left-right direction. Further, the stacking unit 50 is rotatably supported by a support shaft (vertical shaft) protruding from the floor step 7 and can be freely rotated by an operator's hand, for example.

  The loading unit 50 includes a frame 52 that is provided on either the left or right side of the loading table 51 and connects the front loading table 51a and the rear loading table 51b. A plurality of (for example, two) frames 52 are provided side by side in the front-rear direction, and constitute a rotation link mechanism for rotating the front loading platform 51a in the direction indicated by the arrow X in the drawing.

  The frame 52 supports the front loading platform 51a with respect to the rear loading platform 51b while changing the posture between the stacked state and the deployed state of the loading unit 50. In other words, the posture of the frame 52 changes between the stacked state and the deployed state of the stacking unit 50. Specifically, the frame 52 is attached to the rear loading platform 52b and is rotatable in the front-rear direction around a first fulcrum (fixed fulcrum) 521 whose position is fixed, and the front loading platform. It is attached to 51a and can rotate around a second fulcrum (moving fulcrum) 522 that moves in the front-rear direction.

  Further, the frame 52 has a shape bent upward from the middle when the stacking unit 50 is deployed. As described above, the frame 52 is bent upward in the unfolded state of the stacking unit 50, whereby the rigidity of the frame 52 can be increased. A portion ahead of the bent portion of the frame 52 becomes an abutting portion 523 that abuts a movement assisting portion 53 described later.

  In the stacked state, the loading unit 50 fixes work materials (for example, mat seedlings and fertilizer bags) loaded on the loading platforms 51a and 51b on the bottom surfaces 512 of the loading platforms 51a and 51b. In addition, the loading unit 50 releases the fixing of the work material loaded on the loading platforms 51a and 51b in the unfolded state. Here, the fixing of the work material is a state in which the work material cannot be moved on the loading platform 51 (51a), and the work material is stably placed on the loading platform 51 (51a). is there. The work material fixation release is a state in which the work material can be moved on the loading platform 51 (51a). In addition, the loading unit 50 includes a movement assisting unit 53 for releasing the fixation of the work material on the bottom surfaces 512 of the loading platforms 51a and 51b and assisting the movement of the work material in the deployment direction.

  The movement assisting unit 53 is provided on the bottom surface 512 of the loading platform 51 (for example, the front loading platform 51a). The movement assisting part 53 includes a plurality of (for example, two) movement assisting members 531 arranged in the left-right direction. Each roller 531 is provided so that the direction of the rotation shaft 531a is orthogonal to the work material conveyance direction (the deployment direction of the stacking unit 50, for example, the front-rear direction), and is arranged in parallel on the bottom surface 512 of the stacking table 51. . Thus, by providing the roller 531 on the bottom surface 512 of the loading table 51, when the work material moves on the bottom surface 512 of the loading table 51, the movement (conveyance) load of the work material is reduced, and Smooth movement is possible. The plurality of rollers 531 are connected by a connecting shaft 532 parallel to the rotating shaft 531a.

  Further, the movement assisting portion 53 is a protruding portion that is provided to protrude to the side of the loading platform 51 at the end (left end) on the side where the frame 52 is provided, of the left and right ends of the connecting shaft 532. 533. The protruding portion 533 is provided with a contact roller 533 a that serves as a contact portion on the movement assisting portion 53 side when the stacking portion 50 is in contact with the contact portion 523 of the frame 52. Further, the protruding portion 533 is formed in a crank shape and is disposed off the extension line of the connecting shaft 532.

  As illustrated in FIG. 2A, the roller 531 moves below the bottom surface 512 of the stacking platform 51 in the stacked state of the stacking unit 50. Further, the roller 531 moves upward from the bottom surface 512 of the stacking platform 51 in the unfolded state of the stacking unit 50. Specifically, the roller 531 is behind the frame 52 in the stacked state of the stacking unit 50. In this case, since the contact roller 533 a is separated from the contact portion 523 of the frame 52, the roller 531 is depressed below the bottom surface 512. Further, the roller 531 is above the frame 52 in the unfolded state of the stacking unit 50, and is pushed up by the contact roller 533 a contacting the contact portion 523 of the frame 52. As a result, the roller 531 can be automatically acted upon when the stacking unit 50 that moves the work material is deployed. That is, the roller 531 can be automatically operated when necessary.

  Up to now, when the loading table is provided with a movement assist roller, the roller remains protruding in the loading state of the loading unit, and it has been difficult to stabilize the work material on the loading table. Thus, by making the roller 531 into a retractable type, the work material can be fixed on the loading platform 51 (51a) in the loading state of the loading section 50. On the other hand, in the case where the loading table is not provided with a movement assist roller, the work material may not move smoothly in the unfolded state of the loading section, but as described above, by making the roller 531 retractable, Since the roller 531 protrudes from the bottom surface 512 of the loading platform 51 (51a) in the unfolded state of the loading section 50, the working material becomes unstable on the loading platform 51 (51a), and the working material can be unfixed.

  In addition, the roller 531 does not protrude from the bottom surface 512 of the stacking base 51 in the stacked state of the stacking unit 50 and thus does not act on the work material. Accordingly, the work material can be stabilized on the bottom surface 512 by the weight of the work material loaded on the loading table 51. That is, the work material can be fixed on the bottom surface 512.

  Further, as shown in FIG. 2A, the roller 531 is arranged forward by a predetermined distance d from the existing roller, and continuously cooperates with the existing roller with respect to the work material that moves the loading platform 51. Comes to work. The roller 531 is preferably disposed about 250 mm ahead of the existing roller.

  In addition, the movement assistance part 53 is good also as a structure provided with the slide pin extended in the expansion | deployment direction of the stacking part 50 instead of the roller 531 as a movement assistance member, for example. The slide pin is also retractable like the roller 531 and protrudes on the bottom surface 512 of the stacking platform 51 when the stacking unit 50 is unfolded.

  According to the loading unit 50 described above, in the stacked state of the loading unit 50, the work material is fixed to the loading table 51 (51a), and therefore the work material is loaded from the loading table 51 (51a) even when the machine is working. Can be prevented from sliding down. Further, since the working material is released from being fixed in the unfolded state of the loading unit 50, the work material can be easily loaded. That is, workability can be improved.

  In addition, the work auxiliary member 53 can smoothly move the work material released from being fixed in the unfolded state of the stacking unit 50 on the loading table 51, and the work material can be loaded more satisfactorily. In addition, since the work material is fixed to the loading platform 51 (51a) by the movement assisting unit 53 in the stacked state of the loading unit 50, the working material is received from the loading platform 51 (51a) even when the machine body is working. The sliding can be prevented and the work material is unfixed in the unfolded state of the loading platform 51 (51a), so that the work material can be easily loaded. That is, workability can be improved.

  Further, the movement assisting portion 53 moves below the bottom surface 512 of the loading platform 51 (51a) in the stacked state, so that the work material is stabilized on the loading platform 51 (51a) by its own weight, and the movement assisting portion in the deployed state. As 53 moves above the bottom surface 512 of the loading platform 51 (51a), the movement of the work material is assisted by being interposed between the bottom surface 512 and the work material. As a result, it is possible to prevent the work material from slipping down from the loading platform 51 (51a) in the stacked state, and the work material can be easily loaded in the unfolded state.

  Further, since the movement assisting portion 53 can move forward and backward with respect to the bottom surface 512 of the loading platform 51 (51a) by the frame 52 whose posture is changed between the stacked state and the unfolded state, the movement assisting portion 53 can be moved according to the state of the loading portion 50. 53 can be operated reliably.

  In addition, in the stacking unit 50 described above, when changing from the unfolded state to the stacked state, an assist unit is provided that pulls the front stacking platform 51a toward the stacking position, that is, above the rear stacking platform 51b. May be. For example, the assist portion is configured by connecting a middle position of the front frame 52 and a first fulcrum (fixed fulcrum) 521 of the rear frame 52 with a spring member. The spring member extends along the longitudinal direction of the frame 52 when the loading unit 50 is in the deployed state, and assists the front loading platform 51a that moves so that the loading unit 50 is in a stacked state.

<Modification of loading unit 50>
Here, a modified example (stacking unit 50A) of the stacking unit 50 will be described with reference to FIGS. 3A and 3B. FIG. 3A is a schematic left side view showing a stacked state and an unfolded state of a modified example of the stacking unit 50 (the stacking unit 50A). FIG. 3A shows both the stacked state and the unfolded state of the stacking unit 50A. FIG. 3B is a schematic enlarged perspective view of a part A in FIG. 3A.

  As illustrated in FIGS. 3A and 3B, the stacking unit 50 </ b> A includes an assist unit 54. The assist portion 54 includes a pin 541a provided in the middle position of the front frame 52, and a pin 541b provided at the first fulcrum 521 of the rear frame 52 connected to the pin 541a via a spring member 542. Prepare. The pin 541b provided at the first fulcrum 521 is connected to the spring member 542 at the tip portion that is off (offset) from the extension line of the rotation axis of the first fulcrum 521. According to such a configuration, as shown in FIG. 3A, the tip portion of the pin 541b provided at the first fulcrum 521 is disposed behind the first fulcrum 521 in the unfolded state of the stacking portion 50A, and the spring member 542 is attached. You can increase the power.

  The spring member 542 does not interfere with the first fulcrum 521 of the front frame 52 because the tip of the pin 541b provided at the first fulcrum 521 is laterally separated from the first fulcrum 521. Further, the spring member 542 has a free length and the minimum urging force when the stacking portion 50A is stacked, and the urging force is maximum when the stacking portion 50A is stacked. For this reason, a high urging force can be obtained when the stacking portion 50A is changed from the unfolded state to the stacked state.

<Auxiliary loading unit 56>
Next, the auxiliary stacking unit 56 will be described with reference to FIG. FIG. 4 is a schematic left side view showing the auxiliary stacking unit 56. The seedling transplanter 1 (see FIG. 1) has a work material such as a fertilizer bag on the opposite side to the left and right of the loading unit 50 (see FIG. 1), for example, on the front left and right sides of the traveling vehicle body 2 (see FIG. 1). There may be a case where an auxiliary stacking unit 56 is mounted. As shown in FIG. 4, the auxiliary stacking unit 56 includes a plurality (for example, two) of auxiliary stacking tables 57.

  As shown in FIG. 4, the two auxiliary loading platforms 57 are provided so as to be stacked in two upper and lower stages. The auxiliary stacking unit 56 has a marker holding unit 55 (see FIG. 5) for holding the tip end portion (watermill unit) 12a of the marker 12 on a mounting plate 551 described later provided below the auxiliary stacking table 57 disposed on the lower side. 6). FIG. 5 is a schematic left side view showing a modified example (auxiliary stacking unit 56A) of the auxiliary stacking unit 56. As shown in FIG. 5, the auxiliary stacking portion 56 </ b> A is provided such that three auxiliary stacking stands 57 are stacked in three upper and lower stages.

<Marker holding unit 55>
Next, the marker holding unit 55 will be described with reference to FIG. FIG. 6 is a schematic left side view showing the marker holding unit 55. The loading unit 50 includes a marker holding unit 55 that holds the tip portion (water wheel unit) 12a of the marker 12 when the marker 12 is not used. As described above, the marker 12 is provided on the left and right sides of the traveling vehicle body (see FIG. 1) so as to freely move in order to form a travel reference line that is a guide for straight travel in the farm scene. In addition, the marker 12 is provided with a distal end portion 12 a detachably attached to a base portion extending from the traveling vehicle body 2. The distal end portion 12a is removed from the base portion and stored in a predetermined place when the marker 12 is not used.

  As shown in FIG. 6, the marker holding portion 55 includes a clip 552 attached to an attachment plate 551 provided below the rear loading platform, and a small hole 553 formed in the attachment plate 551. The marker holding portion 55 holds the tip portion 12a of the marker 12 by holding the rod 121 of the tip portion 12a by the clip 552 and inserting the bent portion 121a bent at a right angle of the rod 121 into the small hole 553. To do.

  According to such a configuration, when the marker 12 is not used, the distal end portion 12a can be stored in the stacking portion 50 that is a part of the machine body, and the loss of the distal end portion 12a of the marker 12 can be prevented.

<Extended step 71>
Next, the expansion step 71 will be described with reference to FIGS. 7A to 9B. 7A and 7B are schematic plan views showing the floor step 7 and the expansion step 71. FIG. In FIG. 7A, the extension step 71 is hatched. FIG. 8 is a schematic perspective view showing the expansion step 71. FIG. 9A is a schematic perspective view showing the floor step 7 and the expansion step 71. FIG. 9B is an end view taken along line BB in FIG. 9A. As shown in FIG. 7A, the floor step 7 is provided from the front portion of the traveling vehicle body 2 to the rear portion of the engine cover 8 that houses the engine E (see FIG. 1).

  As shown in FIG. 7A and FIG. 7B, expansion steps (also referred to as small steps) 71 shown in FIG. As shown in FIGS. 9A and 9B, the expansion step 71 is substantially the same surface as the floor step 7, and a hole 72 is formed in the step surface 71a. Thus, by forming the hole 72, the operator can visually recognize the front wheel 3 (see FIG. 1) and the like from the floor step 7. In addition, the design is improved.

  Further, as shown in FIGS. 7A, 7B, and 9A, a protruding portion (also referred to as a wide step) 73 is provided on either the left or right side of the floor step 7 or on both sides thereof. The above-described expansion step 71 is disposed between the front portion of the floor step 7 and the overhang portion 73 so as to be sandwiched between them. As described above, the expansion step 71 is arranged between the front portion of the floor step 7 and the overhanging portion 73, so that the expansion step 71 fills the gap, and the area of the entire floor step 7 is also enlarged. Therefore, safety is improved. 9A and 9B, the left and right side edges of the floor step 7 are provided with protrusions 74 that are continuous in the front-rear direction. As described above, the provision of the protruding portion 74 prevents slipping, thereby improving safety.

  Here, as shown in FIG. 7A, a blower 47 connected to a fertilizer (see FIG. 1) and an air duct is provided at either the left or right side end (for example, the left end) of the rear portion of the traveling vehicle body 2. Provided. For example, the blower 47 is configured to be rotatable about 90 degrees toward the inside of the machine body during cleaning of the air duct, discharging of fertilizer, and other maintenance. The seedling transplanter 1 (see FIG. 1) includes a detachable handrail 75 to avoid interference with the blower 47 when the blower 47 is rotated toward the inside of the machine body.

<Handrail 75>
Next, the detachable handrail 75 will be described with reference to FIGS. 10A and 10B are explanatory views of the detachable handrail 75, in which (a) a plan view of the handrail 75, (b) a side view of the handrail 75, and (c) a rear view of the handrail 75. FIG. 11 is an explanatory diagram of the attachment portion (the overhang portion 73) of the detachable handrail 75. FIG. FIG. 12 is an explanatory diagram of attachment of the detachable handrail 75. The detachable handrail 75 is a left handrail provided with a blower 47 on the left and right of the rear part of the traveling vehicle body 2 (see FIG. 7A).

  As shown in FIG. 10, the detachable (left) handrail 75 includes a main body portion 751 and a fixing portion 76. The main body 751 is a pipe-like member and a member that is curved so that a linear one is folded. The fixing portion 76 is a plate-like member whose upper portion is bent, and is welded, for example, to both end portions of the main body portion 751. The fixing portion 76 includes holes 761 and 762. Among these, the hole part 762 is formed in the bent part. A fixture 763 (see FIG. 12) such as a bolt described later is inserted through the holes 761 and 762.

  As shown in FIG. 11, the attachment portion to which the handrail 75 is attached is an overhang portion 73 projecting outward from the floor step 7 (see FIGS. 7A and 7B), and both ends of the pipe-like handrail 75. Provided with a pin 731 to be inserted into the hole 752 of the portion. Then, as shown on the right side of FIG. 12, when attaching the handrail 75, holes 752 at both ends of the handrail 75 are fitted into the pins 731 of the overhanging portion 73, and the fixing tool is inserted through the hole portion 761 of the fixing portion 76. By attaching 763, the handrail 75 is fixed to the overhang portion 73.

  Further, the handrail 75 can also be used for maintaining the posture of the blower 47 that has been turned inside the machine body. In this case, as shown on the left side of FIG. 12, the handrail 75 is attached to both end portions by attaching the fixture 763 to the attachment hole 732 of the overhanging portion 73 from above via the hole portion 762 of the fixing portion 76. It fixes so that the connection part with the air duct of the blower 47 may be inserted | pinched between.

  In this manner, the detachable handrail 75 does not require a change in shape to cope with the rotation of the blower 47. If the shape of the handrail is changed, the left and right shapes are different, and thus there are various problems such as a decrease in design and an increase in the number of parts. However, such a problem occurs in the detachable handrail 75. There is nothing. The detachable handrail 75 can also be provided on the side where the blower 47 is not provided.

  Note that FIG. 13 shows a handrail 77 without the blower 47 on the left and right of the rear portion of the traveling vehicle body 2, and a fixed handrail 77 is shown. FIG. 13 is an explanatory diagram of a fixed handrail 77, (a) a plan view of the handrail 77, (b) a side view of the handrail 77, and (c) a rear view of the handrail 77. In this case, as for the handrail 77, the main-body part 771 is fixed to the overhang | projection part 73 by welding etc.

<Other Modifications of Loading Unit 50 and Fertilizer Application 40>
Next, another modification of the stacking unit 50 (50B) and the fertilizer applicator 40 (40B) will be described with reference to FIG. FIG. 14 is an explanatory diagram of the vicinity of the stacking unit 50B and the fertilizer application device 40B according to another modification. Note that the fertilizer application device 40B illustrated in FIG. 14 is a so-called side fertilizer device disposed on the left and right sides of the traveling vehicle body 2.

  As shown in FIG. 14, the stacking unit 50B, like the stacking unit 50 described above, has a stacked state in which a plurality of stacking bases 51B are overlapped in upper and lower stages and an unfolded state in which the plurality of stacking bases 51B are deployed in a straight line. It is configured to be switchable. Moreover, switching of each state of the stacking unit 50B is automatically performed by an electric actuator, for example. The loading unit 50B includes three loading platforms 51Ba, 51Bb, and 51Bc.

  In the stacking state of the stacking unit 50B, the stacking table 51Ba located at the center (referred to as the central loading table) 51Ba is fixed in the stacked state and the unfolded state, and the stacking table (front loading table) positioned below the central loading table 51Ba. 51Bb is moved forward as indicated by the arrow Y1 in the figure, and a loading table (referred to as a rear loading table) 51Bc located above the central loading table 51Ba is deployed. In the case, as shown by the arrow line Y2 in the figure, it moves backward. The front loading platform 51Bb and the rear loading platform 51Bc are connected to the central loading platform 51Ba via a rotation link mechanism constituted by a frame 52, respectively. Further, the front loading platform 51Bb is configured by a loading platform having a plurality of upper and lower stages (two stages).

  According to such a configuration, the front loading platform 51Bb positioned below the central loading platform 51Ba fixed in the stacked state of the stacking unit 50B moves forward when unfolded. For example, as shown in FIG. In addition, it is possible to prevent interference with the blower 14 provided in the rear part of the machine body during the movement during deployment. Further, since the front loading platform 51Bb moves downward when changing from the deployed state to the stacked state, for example, the load on the electric actuator is reduced. Further, since the front loading platform 51Bb is composed of a plurality (two) of loading platforms, the amount of work material replenished can be increased.

  Further, as shown in FIG. 14, each loading platform 51B of the loading section 50B is inclined upward from the front to the rear. In this case, the rear loading platform 51Bc disposed at the rear in the unfolded state of the loading portion 50B is located in front of the lid portion 42 of the storage hopper 41 of the fertilizer application device 40B and provided on both sides of the traveling vehicle body 2. It is located above the handrail 15 (which may be a handrail 77 as shown in FIG. 12). That is, since the loading part 50B is lower in the front than the rear in the unfolded state, the supply position of the work material is lowered and the supply performance is improved. Further, the rear loading platform 51Bc does not interfere with the lid portion 42 of the storage hopper 41, and for example, the lid portion 42 can be opened even when the loading portion 50B is deployed. Further, since the rear loading platform 51Bc does not interfere with the handrail 15, the handrail 15 is not obstructed when receiving work materials. Moreover, even if it is the design by which the blower 14 different from the rotational blower 47 as shown to FIG. 7A is arrange | positioned ahead of the storage hopper 41 of the fertilizer application 40B, the loading part 50B can be expand | deployed.

  Further, in the unfolded state of the stacking unit 50B, the storage hopper 41 and the blower 14 of the fertilizer application device 40B are arranged so as to fit at least within the left and right widths of the stacking platform 51B below the loading platform 51B in the rear view of the machine body. Thereby, the body width can be suppressed, and for example, the body can be loaded on a transport vehicle such as a light truck.

<Control related to fertilizer application 40>
Next, with reference to FIG. 14, FIG. 15A, and FIG. 15B, the control relevant to the fertilizer applying apparatus 40 (40B) by the control part 100 is demonstrated. FIG. 15A and FIG. 15B are block diagrams illustrating the respective units related to notification control by the control unit 100. As shown in FIG. 14, a powder sensor 101 such as an ultrasonic sensor is provided on the lid portion 42 of the storage hopper 41 of the fertilizer application device 40B. The powder sensor 101 detects fertilizer (powder) in the storage hopper 41. The powder sensor 101 is arrange | positioned above the supply part 43 which pays out fertilizer. Further, the feeding shaft 44 of the feeding unit 43 is provided with a feeding shaft rotation sensor 103 that detects the rotation of the feeding shaft 44.

  As shown in FIG. 15A, in the control related to the fertilizer application device 40B (see FIG. 14), when the fertilizer application failure in the fertilizer application device 40B and other failures in each part occur, the control unit 100 causes the notification unit 150 to Let me know. As shown in FIG. 15A, a powder sensor 101, a fertilizer height sensor 102, a feeding shaft rotation sensor 103, a planting lever position sensor 104, a heel clutch lever position sensor 105, and the like are connected to the control unit 100. In addition, a notification unit 150 is connected to the control unit 100. In addition, the alerting | reporting part 150 is good also as a structure provided with the lamp 151 and the buzzer 152 (refer FIG. 15B).

  The control unit 100 outputs a signal to the notification unit 150 when a signal indicating a decrease in fertilizer is input from the powder sensor 101. The notification unit 150 notifies “fertilizer trouble”. In this case, in the feeding part 43, when the fertilizer decreases, the upper surface of the fertilizer becomes concave. As described above, since the powder sensor 101 is located above the fertilizer feeding portion 43, it can be detected that the upper surface of the fertilizer is concave, and the fertilizer is reduced in the storage hopper 41. Can be detected in the shortest time.

  Further, the control unit 100 receives a fertilizer height detection signal at the time of planting “on” by the fertilizer height sensor 102 after turning of the machine body during work in the field, and also feeds the feed shaft by the feed shaft rotation sensor 103. 44 (see FIG. 14) is input, and based on these detection signals, when the descent of the fertilizer height stops, or when the descent amount of the fertilizer height is less than the predetermined amount A signal is output to the unit 150. The notification unit 150 notifies “fertilizer trouble”. Moreover, the control part 100 performs this control for every process of planting. In the planting process, since fertilizer is replenished at the edge of the plant, the decrease in fertilizer can be detected after the fertilizer is replenished, and the decrease in fertilizer can be accurately grasped. In addition, when the fertilizer height sensor 102 detects an increase in the fertilizer height due to fertilizer replenishment, the control unit 100 newly detects the fertilizer height with the feeding shaft 44 rotated in planting “ON”. Then, the above control is continued. Thereby, the decrease in fertilizer can be monitored with the start of the fertilizer height when the fertilizer feed is resumed.

  In addition, when it is detected that the rod clutch lever is operated by the rod clutch lever position sensor 105, for example, the control unit 100 detects that the fertilizer in increments of two has not decreased. No signal is output to 150. That is, “fertilizer trouble” is not notified. Further, when it is detected by the heel clutch lever position sensor 105 that the heel clutch lever is returned to the original position, the control unit 100 notifies that the fertilizer corresponding to the strip is not decreased. A signal is output to the unit 150. That is, “fertilizer trouble” is notified. Thereby, for example, forgetting to return after using the one-line clutch can be prevented.

  As shown in FIG. 15B, the control unit 100 is connected to a rear wheel rotation sensor 106, a center float position sensor 107, a planting depth lever position sensor 108, a hydraulic pressure sensitivity sensor 109, and the like. In addition, a notification unit 150 is connected to the control unit 100. The notification unit 150 includes a lamp 151 and a buzzer 152. The control unit 100 receives a signal indicating that the aircraft is moving backward by the rear wheel rotation sensor 106 (and the back detection switch, etc.), and the center float 32 (see FIG. 14) is grounded to the farm scene by the center float position sensor 107. When a signal that detects this is input, a signal is output to the notification unit 150. The notification unit 150 notifies, for example, a lamp 151 and a buzzer 152 that notify a manure clog. In addition, the control part 100 outputs the signal which makes the alerting | reporting part 150 complete | finish notification, for example, when operation of a buzzer stop switch, planting start, or key-off is detected. In this case, for example, the clogging of the fertilizer can be prevented by notifying the grooving machine that mud is clogged by the backward movement of the machine body.

  The control unit 100 outputs a signal to the notification unit 150 according to the position of the planting depth lever detected from the planting depth lever position sensor 108 from “shallow” to “deep”, and the center The position of the float 32 (see FIG. 14) is controlled to be either “sensitive” or “insensitive”. In this case, the control unit 100 makes the position “sensitive” when the position of the center float 32 is lowered (ie, shallow), and sets the position “when the position of the center float 32 is raised (ie, deep)”. Control to be "insensitive". Thus, the control unit 100 can perform optimal switching control.

  The control unit 100 outputs a signal to the notification unit 150 according to the position of the hydraulic sensitivity detected by the hydraulic sensitivity sensor 109 from “sensitive” to “insensitive”, and the center float 32 (see FIG. 14). The position of is controlled to be either “sensitive” or “insensitive”. In this case, the control unit 100 determines that the position of the center float 32 is “insensitive” and the position of the hydraulic sensitivity is “insensitive” in the field where the hydraulic sensitivity position is “sensitive” because the topsoil is soft and mud does not easily clog. Since the topsoil is hard in the field “and the grooving machine is easily clogged with mud, the position of the center float 32 is controlled to be“ sensitive ”. Thus, the control unit 100 can perform optimal switching control.

  In addition, the control unit 100 sets the rear wheel rotation sensor 106 to detect the backward movement of the aircraft with a smaller number of counts as the hydraulic sensitivity position is “insensitive”, and the rear wheel rotation sensor 106 detects the backward movement of the aircraft. When a signal is input and a signal is detected by the center float position sensor 107 that the center float 32 (see FIG. 14) is grounded on the farm scene, the signal is output to the notification unit 150. In addition, the control unit 100 sets the planting depth lever position sensor 108 to detect the backward movement of the aircraft with a smaller number of counts as the planting depth lever position is “deeper”. When a signal indicating that the aircraft is moving backward is input and a signal indicating that the center float 32 is grounded to the farm scene is input by the center float position sensor 107, a signal is output to the notification unit 150. In this way, under conditions where the grooving machine is likely to be clogged with mud, clogging of the mud can be prevented by detecting the backward movement of the machine body with a smaller moving distance.

  Further, as shown in FIG. 14, an image recognition device such as a camera whose front and upper sides are covered with a mudguard cover is provided in front of the seedling placement table 31 of the seedling planting unit 30, and the image recognition device It is good also as a structure which recognizes the overflow of a fertilizer based on the imaged image. In this case, means for rotating by the power of the vertical slide when raising and lowering the seedling mounting table 31 is provided, and as shown in FIG. 15B, the control unit 100 detects the overflow of the fertilizer from the fertilizer hose 45 by the image of the image recognition device. Then, a signal is output to the notification unit 150. The alerting | reporting part 150 alert | reports the fertilizer overflow with the lamp 151 and the buzzer 152. FIG. That is, when one apparatus (seedling planting part 30) operates, the situation of the fertilization hose 45 of a wide range is grasped, and it is notified when the overflow of the fertilizer is detected.

  Further, as shown in FIG. 14, for example, a weight detection unit 46 that detects the weight of the fertilizer is provided in the pipe portion that holds the entire fertilization hose 45, and the control unit 100 controls the field with the traveling vehicle body 2 in the planting state. When it is detected that the weight of the fertilizer in the fertilizer hose 45 continues to increase when the weight detector 46 travels, the clogging of the fertilizer is detected. Thereby, the fertilizer collected in the fertilizer hose 45 can be detected, and the clogging of the fertilizer can be detected even in an unmanned situation, for example.

<Swing restriction structure of the rear wheel 4 (swing restriction part 60)>
Next, the swing restricting structure (swing restricting portion 60) of the rear wheel 4 will be described with reference to FIGS. 16A and 16B. 16A and 16B are explanatory diagrams of the swing restricting structure (swing restricting portion 60) of the rear wheel 4. FIG. FIG. 8A is a schematic view of the swing restricting structure (swing restricting portion 60), and is a view (rear view) of the traveling vehicle body 2 as viewed from the rear. FIG. 16B is a schematic left side view of the rear wheel 4 and its periphery.

  As shown in FIG. 16A, the swing restricting portion 60 restricts the vertical movement (referred to as swing) of the left and right rear wheels 4 (4L, 4R) by a predetermined angle (for example, 20 degrees) or more. The swing restricting unit 60 includes a pendulum weight 61, a swing lock plate 62, and a cable 63. The pendulum weight 61 is provided at the central portion on the axle 4a of the rear wheel 4 so as to be swingable in the left-right direction as indicated by an arrow Z in the figure. The pendulum weight 61 swings left and right around the fulcrum 61a according to the horizontal tilt of the airframe due to the swing of the left and right rear wheels 4L and 4R. The swing lock plates 62 (62L, 62R) are connected to the axle 4a at the left and right ends of the axle 4a and inside the left and right rear wheels 4L, 4R.

  As shown in FIG. 16B, the swing lock plate 62 is formed with a plurality (two) of small holes 62a arranged vertically. 16A, the cable 63 (63L, 63R) is provided between the pendulum weight 61 and the swing lock plate 62 (62L, 62R), and the pendulum weight 61 and the swing lock plate 62 (62L, 62R). ). For example, when the pendulum weight 61 swings such that the left rear wheel 4L rises and the right rear wheel 4R falls among the left and right rear wheels 4L, 4R, the swing restricting portion 60 is shifted toward the right rear wheel 4R side. The 61a side moves to the left. Along with this, the cable 63R connected to the right rear wheel 4R is pulled upward, and the right rear wheel 4R is pulled up. Thus, by reducing the up / down swing amount of the left and right rear wheels 4L, 4R, the left and right rear wheels 4L, 4R can be regulated, and the tipping angle during the movement of the aircraft can be automatically improved. it can.

  In the swing restricting unit 60 described above, the pendulum weight 61 is provided at the rear part of the machine body. For example, the pendulum weight 61 may be provided at the front part of the machine body. With this configuration, the pendulum weight 61 can replace the balance weight, and the number of parts can be reduced. Moreover, you may comprise so that the swing control part 60 may be made to act at the time of the raising of the seedling planting part 30 (refer FIG. 1). By setting it as this structure, since the swing control part 60 acts in the state which the seedling planting part 30 is rising, ie, the state with a bad body balance, a fall angle can be improved more effectively.

<Seedling outlet 80 and spacer 90 for dense seedlings>
Next, the seedling inlet 80 for densely seedling seedlings will be described with reference to FIGS. 17A to 18C. FIG. 17A is a schematic left side view (partially cross-sectional view) showing the seedling inlet 80 and the spacer 90 for densely seeding seedlings. FIG. 17B is a schematic rear view showing the seedling inlet 80 and the spacer 90 for densely seeding seedlings. FIG. 18A is a schematic left side view showing a seedling inlet 80 and a spacer 90 for densely seeding seedlings. FIG. 18B is a schematic plan view showing the seedling inlet 80 and the spacer 90 for densely seeding seedlings. FIG. 18C is a schematic rear view showing the seedling inlet 80 and the spacer 90 for densely seeding seedlings.

  Here, when planting densely seeded seedlings, it is necessary to replace the seedling inlet for conventional seedlings with a seedling outlet for densely seeded seedlings in which the width and depth of the seedling outlet are narrowed. In this case, it takes time to remove the fastening member such as a bolt and replace the seedling opening. In addition, for example, when it is desired to separate densely seeded seedlings and conventional seedlings for each field, it is necessary to frequently change seedling outlets. For this reason, in this embodiment, as shown in FIGS. 17A and 17B, by adjusting the vertical width and depth of the seedling inlet 80 using the spacer 90, it is possible to perform conventional seedling use and dense seedling use. It can be changed.

  As shown in FIG. 17A and FIG. 17B, a spacer 90 is attached to the upper part of the seedling collection port 80 for a conventional seedling. Thereby, the vertical width and depth of the seedling collection port 80 are narrowed, and the seedling collection port 80 for dense seedlings can be formed. Thereby, it is possible to change between dense seeding seedling use and conventional seedling use only by attaching or removing the spacer 90, so that it is not necessary to replace the seedling collection port 80, and labor can be saved.

  As shown in FIGS. 18A, 18B, and 18C, the spacer 90 includes an engaging portion 91 and a hanging plate portion 92. The engaging portion 91 includes a hook 91a. As shown in FIG. 18B, the hook 91 a fits into a hole 82 formed in the upper surface 81 of the seedling collection port 80. Since the hook 91a is pushed back toward the front side, the hook 91a is caught in the hole 82 and is prevented from coming off. The engaging portion 91 is engaged with the seedling taking port 80 by inserting a hook 91 a provided on the lower plate into the hole portion 82 while sandwiching the upper surface between the upper and lower plates.

  Further, the engaging portion 91 is formed so that the upper and lower plates spread in the depth direction. Thereby, attachment of the spacer 90 becomes easy.

  The hanging plate portion 92 is, for example, a leaf spring and has elasticity. The hanging plate portion 92 extends downward with the spacer 90 attached to the seedling collection port 80. Further, the vertical plate portion 92 has a distal end portion (lower end portion) bent in the depth direction.

  Further, as shown in FIG. 18A, the opening 83 is provided in the seedling collection port 80. For example, when removing the spacer 90, the spacer 90 can be easily removed by inserting a tool such as a screwdriver into the opening 83. Can do.

  FIG. 19A is a schematic left side view showing a seedling inlet 80 for densely seeded seedlings and a modified example of spacers (spacer 90A). FIG. 19B is a schematic plan view showing a seedling inlet 80 for dense seeding seedling and a modified example of the spacer (spacer 90A). FIG. 19C is a schematic rear view showing a seedling inlet 80 for dense seeding seedling and a modified example of the spacer (spacer 90A).

  As shown in FIGS. 19A, 19B, and 19C, the spacer 90A according to the modification includes an engaging portion 91A and a hanging plate portion 92A. The engaging portion 91A includes a hook 91Aa. As shown in FIG. 19B, the hook 91 </ b> Aa is fitted into a hole 82 formed in the upper surface 81 of the seedling collection port 80. As shown in FIG. 19B, the hook 91Aa is formed in a U-shape to increase the rigidity.

  The hanging plate portion 92A is, for example, a leaf spring and has elasticity. The hanging plate portion 92 </ b> A extends downward with the spacer 90 </ b> A attached to the seedling collection port 80. In addition, the vertical plate portion 92A has a distal end portion (lower end portion) bent in the depth direction.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

1 Work vehicle (seedling transplanter)
2 traveling vehicle body 3 front wheel 4 rear wheel 4a axle 5 machine body frame 6 power transmission device 6a belt type power transmission unit 6b transmission case 7 floor step 8 engine cover 9 cockpit 11 bonnet 11a front cover 12 marker 12a tip (water turbine part)
121 Rod 121a Bending part 13 Leveling device (Leveling rotor)
DESCRIPTION OF SYMBOLS 14 Blower 15 Handrail 20 Lifting device 21 Lifting link 22 Lifting cylinder 30 Seedling planting part 31 Seedling mounting base 32 Float 33 Planting device 331 Planting rod 332 Rotary case 333 Planting transmission case 40 Fertilizer 41 Storage hopper 42 Lid 43 Feeding section 44 Feeding shaft 45 Fertilization hose 46 Weight detection section 47 Blower 50 Stacking section 51 Loading platform 51a Front loading platform 51b Rear loading platform 511 Side wall 512 Bottom surface 52 Frame 521 First supporting point (fixed supporting point)
522 Second fulcrum (moving fulcrum)
523 Contact portion 53 Movement assist portion 531 Roller 531a Rotating shaft 532 Connection shaft 533 Projection portion 533a Contact roller 54 Assist portion 541a Pin 541b Pin 542 Spring member 55 Marker holding portion 551 Mounting plate 552 Clip 553 Small hole 56 Auxiliary stacking portion 57 Auxiliary loading table 60 Swing restricting portion 61 Pendulum weight 62 Swing lock plate 62a Small hole 63 Cable 71 Expansion step (small step)
71a Step surface 72 Hole 73 Overhang (wide step)
731 Pin 732 Mounting hole 74 Projection 75 Handrail (detachable handrail)
751 Body portion 752 Hole 76 Fixed portion 761 Hole portion 762 Hole portion 763 Fixture 77 Handrail (fixed handrail)
771 Main body 80 Seedling opening 81 Upper surface 82 Hole 83 Opening 90 Spacer 91 Engaging portion 91a Hook 92 Hanging plate portion 100 Control unit 101 Powder sensor 102 Fertilizer height sensor 103 Feeding shaft rotation sensor 104 Planting lever position sensor 105 畦 Clutch lever position sensor 106 Rear wheel rotation sensor 107 Center float position sensor 108 Planting depth lever position sensor 109 Hydraulic sensitivity sensor 150 Notification unit 151 Lamp 152 Buzzer

Claims (5)

A loading section provided on the traveling vehicle body and capable of switching between a stacked state in which a plurality of loading platforms on which work materials are loaded is stacked in multiple stages, and a deployed state in which the stacked state is expanded linearly from the stacked state;
The loading section is
The work vehicle loaded on the loading table in the stacked state is fixed on the loading table, and the working material loaded on the loading table is unfixed in the unfolded state. The loading section is
A movement assisting part for assisting movement of the work material in the unfolding direction of the loading platform in the unfolded state;
The movement assisting part is:
Fixing the work material loaded on the loading table in the stacked state of the loading unit on the loading table, and releasing the work material loaded on the loading table in the unfolded state of the loading unit; The work vehicle according to claim 1. The movement assisting part is:
3. The device is provided on a bottom surface of the loading table, and moves downward from the bottom surface of the loading table in the stacked state, and moves upward from the bottom surface of the loading table in the unfolded state. The work vehicle as described in. The loading section is
A frame for supporting the loading platform while changing the posture between the stacked state and the deployed state;
The movement assisting part is:
4. The work vehicle according to claim 3, wherein the work vehicle is pushed up while abutting on the frame in the unfolded state, and is separated from the frame in the stacked state. It is provided on the left and right side portions of the traveling vehicle body so as to be freely retractable, and a distal end portion is provided so as to be detachable from the base portion. When the traveling vehicle body travels in the field, the traveling vehicle body advances to the farm scene as the traveling vehicle body travels. A marker for forming a reference line;
The loading section is
The work vehicle according to claim 1, further comprising: a marker holding portion that holds the tip portion of the marker.

Images