JP2012231695A - Seedling transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seedling transplanter solving the problem that a working operation for detecting the fertilizer concentration in a farm and changing fertilizer application level according to the thus detected fertilizer level makes an accurate fertilizer application level difficult to regulate in coping with changing fine fertilizer concentrations, therefore adjustment difficult to coincide with a proper fertilizer application level.SOLUTION: The seedling transplanter includes a fertilizer application device having a level sensor 71 to detect the fertilizer concentration in soil and a controller 72 to calculate fertilizer application level based on the thus detected value from the level sensor 71 and making a control of fertilizer application levels through reflecting the thus calculated fertilizer application level on the driving of a fertilizer unloading roll 13. In this seedling transplanter, there are provided a control motor 6 subject to driving control by the controller 72 and an indication needle 9 subject to movement by a screw shaft 7 revolved by the control motor 6, and this seedling transplanter is so constructed that: a regulator 8 to regulate fertilizer unloading levels by the fertilizer unloading roll 13 with the control motor 6 is put under control and the indication needle 9 is moved; and the movement level of the indication needle 9 is detected by a stroke sensor 14; and when the thus detected value coincides with a fertilizer application level calculated by the controller 72, the driving of the control motor 6 is put to a halt.

Description

  The present invention relates to a seedling transplanter equipped with a fertilizer application device that detects fertilizer concentration on a soil surface while traveling in a field and applies and controls the fertilizer amount corresponding to the fertilizer concentration.

  It has a fertilizer concentration sensor that detects the fertilizer concentration in the soil, and a tiller depth sensor that detects the depth of the soil tiller, and a technique for applying fertilizer while calculating the amount of fertilization by detection of these sensors (for example, Patent Document 1) is known.

JP 2010-000019 A

  The fertilizer concentration sensor detects and calculates the fertilization amount, and this is controlled by the electric control of the feeding motor that rotates the feeding roll, and it is difficult to maintain the accurate fertilizing amount. The error fluctuation of quantity control tends to be large.

  The invention according to claim 1 is a fertilizer concentration sensor (71) that detects fertilizer concentration in soil while fertilizing and running, and a fertilizer application control device that calculates fertilizer application amount based on detection of the fertilizer concentration sensor (71). In the seedling transplanting machine provided with a fertilizer that is configured to control the fertilizer amount by reflecting the fertilizer amount calculated by the fertilizer amount controller (72) in the drive of the feeding roll (13). An adjustment motor (6) driven and controlled by a quantity control device (72) and an indicator needle (9) moved to a helical shaft (7) rotated by the adjustment motor (6) are provided, and the adjustment motor (6 ), The fertilizer amount adjusting device (8) for adjusting the feed amount by the feed roll (13) is interlocked and adjusted, and the indicator needle (9) is moved, and the movement amount of the indicator needle (9) is determined by the stroke sensor ( 14) And seedling transplanter, characterized by stopping the driving of the regulating motor (6) by the detected value by Kusensa (14) matches the amount of fertilizer value calculated by the fertilizer amount control device (72).

  The fertilizer concentration sensor 71 detects the concentration of the fertilizer component in the soil as the vehicle travels, and the fertilizer application controller 72 drives the adjustment motor 6 while calculating the fertilizer application amount in the soil at the travel position. Accordingly, the fertilizer application amount adjustment device 8 for adjusting the fertilizer application amount or the supply amount of the fertilizer application device 4 by the supply roll 13 is adjusted in conjunction with movement of the indicator needle 9. The movement of the indicating needle 9 is detected by the stroke sensor 13, and when the indicating needle 9 reaches the position of the facility fertilizer value calculated by the fertilizing amount control device 72, the driving of the adjusting motor 6 is stopped. Then, the adjustment of fertilizer amount is stopped.

  In the invention according to claim 2, the fertilizer application control device (72) for calculating an appropriate fertilizer application amount detects the detected value of the fertilizer concentration sensor (71) and the depth of the soil cultivator. The seedling transplanter according to claim 1, wherein the fertilizer application amount is calculated from the detection value of the sensor (74).

  The fertilization amount calculated by the fertilization amount control device 72 is determined by the fertilizer concentration detected by the fertilizer concentration sensor 71 and the detection by the tiller depth sensor 74 for detecting the depth of the soil layer to be fertilized. The amount of fertilizer applied to the traveling soil position is calculated. Under the detection conditions by these sensors 71 and 74, the adjusting motor 6 is driven and the rotation of the feeding roll 13 is controlled to feed the fertilizer. While the fertilizer application amount is adjusted, the movement stop position of the indicator needle 9 is detected by the stroke sensor 14 while the indicator needle 9 is moved. Since fertilizer is applied and a small amount of fertilizer can be applied in shallow soil, the fertilizer concentration can be made uniform regardless of changes in the depth of the soil.

  The invention according to claim 3 arranges the spiral shaft (7) and the indicator needle (9) moved by the spiral shaft (7) in a sensor case (16) provided with an indicator (15), The seedling transplanter according to claim 1 or 2, wherein the moving position of the indicator needle (9) can be seen through from the outside of the sensor case (16).

  As described above, the fertilizer concentration on the soil surface during fertilization traveling is controlled by the fertilizer concentration sensor 71 and the adjustment motor 6 is operated to output the fertilizer amount adjustment device 8 and the indicator needle 9 is moved. The operator can see the movement state of the indicating needle 9, the indicating needle 9 detected by the stroke sensor 14, the stop instruction position, and the like from the outside of the sensor case 16.

  According to a fourth aspect of the present invention, a fertilizer concentration sensor (71) for detecting the fertilizer concentration of the soil is mounted as a conductive plate (17) on an axle (80) of a front wheel (10), and the axle (80) is mounted. The front axle housing 93 to be mounted on the shaft is provided with a slip ring (64) that rotates integrally with the axle (80), and a pair of conductive brushes (67, 67) that are in sliding contact with the upper part of the rotational peripheral surface (65) of the slip ring (64). 68). The seedling transplanting machine according to any one of claims 1 to 3, wherein the seedling transplanting machine is provided.

  When the fertilizer machine body 2 is fertilized, the left and right conductive plates 17 provided on the axle 80 together with the front wheels 10 are stepped into the soil and rotated, and the fertilizer contained in the soil is determined by the conductivity between the left and right conductive plates 17. The concentration of is detected. The conductivity between the conductive plates 17 is energized from the conductive plate 17 to the fertilizer application control device 72 via the slip links 64 and the conductive brushes 67 and 68 that are in sliding contact with the rotating peripheral surface 65 of the slip ring 64. Since the slip link 64 and the conductive brushes 67 and 68 are arranged as a pair of front and rear along the rotation peripheral surface 65, either the front or rear power brush 67 or 68 is slid on the rotation peripheral surface 65 of the slip ring 64. Contact to maintain accurate and stable electrical conduction and detection. Further, since the outer peripheral portions of the slip ring 64 and the conductive brushes 67 and 68 are covered with the front axle housing 93 to prevent the intrusion of muddy water or the like, the accurate fertilizer concentration is maintained.

  The invention according to claim 1 is provided with a spiral shaft 7 that adjusts and interlocks the fertilizer application amount adjustment device 8 of the soil fertilizer 5, an indicator needle 9 that is moved by the spiral shaft 7, and the movement of the indicator needle 9. By providing the stroke sensor 14 for detecting the position, the driving of the adjustment motor 6 is stopped when the value detected by the stroke sensor 14 coincides with the fertilization amount value calculated by the fertilization amount control device 72. Since the amount of fertilizer can be accurately controlled, the fertilizer feed amount of the fertilizer application device 5 is automatically switched and adjusted according to the detected fertilizer concentration in the field, so that the fertilizer concentration in the entire field becomes uniform. The growth of the crop is stabilized and the quality is improved.

  Moreover, since it is the structure which detects the switching adjustment state of the fertilizer application amount adjusting device 8 with the stroke sensor 14, and stops at an appropriate adjustment position, the adjustment stop position of a fertilizer is easy to be determined, and it corresponds to switching of a trace amount fertilizer supply. Therefore, the fertilizer concentration in the field can be made uniform and fertilization accuracy can be improved, and the growth of the crop can be stabilized and the quality can be further improved.

  In addition to the effect of the invention of claim 1, the invention of claim 2 calculates the fertilizer concentration by input from the tiller depth sensor 74 that detects the depth of the soil, and the tiller depth sensor 74. Based on the calculation result, the adjusting motor 6 is driven to move the indicating needle 9, and the movement of the indicating needle 9 is detected and controlled by the stroke sensor 14. Regardless, since an appropriate amount of fertilization can be performed in any soil, the growth and quality of crops can be further improved.

  In addition to the effect of the invention of claim 1 or 2, the invention of claim 3 is provided with a sensor case 16 having an indicator 15 formed in the movement stroke area of the indicator needle 9 that is moved by the drive control of the adjusting motor 6. Since the movement of the indicator needle 9 can be viewed from the outside of the sensor case 16, the fertilizer replenishment timing can be determined while the operator can easily see the indicator needle 9, so that the fertilizer replenishment timing can be determined. As it becomes easier to predict the duration of fertilization and fertilization, work efficiency is improved.

  Further, since the indicator needle 9, the spiral shaft 7, the stroke sensor 15 and the like are arranged in the sensor case 16, the sensor case 16 prevents the mud and fertilizer from being scattered and attached. Since the operation is performed smoothly and the detection by the stroke sensor 15 is normally performed, the detection result is prevented from being disturbed, and the fertilization accuracy is further improved.

  The indicator needle 9 detected by the stroke sensor 15 is moved long in the front-rear direction by the spiral shaft 7 rotated by the adjusting motor 6, so that the amount of movement of the indicator needle 9 is determined by the output from the fertilizing amount control device 72. Since the fertilizer application amount adjustment device 8 can be interlocked to adjust the fertilizer application amount promptly, the occurrence of malfunction of the fertilizer application amount adjustment can be prevented and accurate fertilizer application control can be performed. .

  In addition to the effect of the invention described in any one of claims 1 to 3, the invention described in claim 4 is provided in the front axle housing 93 of the front wheel 10 and at the upper position of the rotational peripheral surface 65 of the slip ring 64. By providing the pair of conductive brushes 67 and 68, the position of the conductive brushes 67 and 68 can be set to a position higher than the soil surface position of the field, for example, a position higher than the axle 80. Is maintained, and accurate conduction and fertilizer concentration detection is maintained.

  Further, by arranging the conductive brushes 67 and 68 at a position higher than the axle 80, it can be made less susceptible to the influence of lubricating oil and the like, and maintenance such as replacement of the conductive brushes 67 and 68 is facilitated. .

Side view of seedling transplanter Top view of seedling transplanter Front view of front wheel of seedling transplanter Front view of seedling transplanter Right side view of the fertilizer application part of the seedling transplanter Left side view of the stroke sensor of the seedling transplanter Block diagram of fertilizer application control device Front sectional view of axle housing (A) Side view of slip ring part of axle housing part, (B) Side view of slip ring part of another embodiment (A) Plan view of a stroke sensor section showing another embodiment, (B) Side view of the stroke sensor section showing another embodiment (C) Front view of the stroke sensor section showing another embodiment (A) Front sectional view of a front wheel portion showing another example, (B) Side view of the front wheel portion showing another example (A) Front view of center mascot part, (B) Side view of center mascot part

  Based on the drawings, the seedling planter 1 connects a multi-row seedling planting device 4 for planting seedlings on a soil surface to a lifting link 3 having a parallel link configuration on the rear side of a traveling vehicle body 2 traveling in a field, A fertilizer application device 5 for applying fertilizer to the soil surface where the seedling is planted is mounted on the rear portion of the vehicle body 2. The traveling vehicle body 2 includes a pair of left and right front wheels 10 and a rear wheel 11 to form a tractor vehicle body form of a riding four-wheel traveling form. The traveling vehicle body 2 includes a transmission case 12 disposed at the front, and an upper portion. A front cover 32 having various operation mechanisms is provided on the front side of the steering post having the driver's seat 31 and the steering handle 34, and a center mascot 33 or the like serving as an indicator of straight traveling is provided.

  Further, a floor step 35 is provided on the traveling vehicle body 2, and a spare seedling table 38 is provided on the left and right sides of the front portion of the traveling vehicle body 2 and on the lateral side of the machine body for placing a supplementary seedling. Reference numeral 39 denotes an operation panel for operating the seedling transplanter 1.

  The seedling planting device 4 includes a seedling tank 51 that places seedlings and feeds them to a planting part, and a planting device 52 that separates and holds seedlings that are fed from the seedling tanks 51 and plant them on the soil surface. 55, and the soil surface leveled by the side float 56, it is set as the structure of the multi-row planting form of a total six-row planting planted by two for every float 55,56.

  The spiral tafloat 55 and the side float 56 are respectively grounded and slid up and down at the center of the lower part of the seedling planting device 4 and the left and right sides, and the center float 55 is swung while leveling the soil surface. The raising / lowering cylinder 53 is expanded and contracted by the movement, and the raising / lowering control is performed so as to maintain the seedling planting depth constant by raising / lowering the seedling planting device 4 to a desired ground height.

  The fertilizer application device 5 has a fertilizer hopper 60 for storing fertilizer at an upper portion thereof, and a feeding roll 13 that receives and feeds the fertilizer flowing down from the supply port 18 at the lower portion of the fertilizer hopper 60 is fed into a feeding case 20. The supply port 18 is provided with a shutter 40, an adjustment plate 41 as a fertilizer application amount adjusting device 8, and the like. This is a mode in which the feed amount by the feed roll 13 is increased, decreased, or adjusted by adjusting the opening degree of the supply port 18 by the adjusting plate 41.

  A fertilizer guide 63 that forms a fertilizer groove near the seedling planting position by the seedling planting device 52, such as a fertilizer hose 62 that guides the fertilizer fed by the feed roll 13, from the planting action position of the seedling planting device 52. Are also attached to the floats 55 and 56 at the front side position. The fertilizer guided from the fertilizer hose 62 is discharged into the fertilizer groove of the soil for fertilization.

  Further, a fertilizer concentration sensor 71 for detecting the fertilizer concentration in the soil is provided inside the left and right traveling front wheels 10 to enter the soil, and the energization resistance or electrical conductivity in the soil between the left and right sensors 71 is detected. It is a configuration. The fertilizer concentration sensor 71 is composed of a conductive plate 17 in the form of a disc. The fertilizer application amount control device 72 built in the front cover 32 is configured to change and adjust the fertilizer application amount of the fertilizer application device 5 by controlling the feed amount adjustment device 8 based on the detection data of the fertilizer concentration sensor 71.

  73 is a temperature sensor that detects the temperature of the soil, 74 is a plow depth sensor that detects the depth of the plow in the field, and 75 receives GPS signals from a plurality of sanitations in the sky and acquires confidence position data. A GPS receiver 76 is a data box for storing fertilizer concentration and fertilizer application data at various locations in the field for each position data acquired by the GPS receiver 75.

  When the traveling vehicle body 2 travels on the field, the fertilizer in the fertilizer hopper 60 is discharged to the soil on the front side of the fertilizer guide 63, the spiral tafloat 55, and the side float 56 via the feed roll 13 and the fertilizer hose 62 in the feed case 20. Is done. The seedling planting device 52 acts on the soil prepared by sliding the spiral tafloat 55 and the side float 56 to plant seedlings in the seedling tank 51.

  At this time, the fertilizer concentration sensor 71 detects the energization resistance or electrical conductivity of the soil between the left and right traveling front wheels 10 by the pair of left and right fertilizer concentration sensors 71 and calculates as the fertilizer concentration of the soil in the fertilizer application amount control device 72. To do.

  Moreover, the temperature of the soil is detected by the temperature sensor 73, and the fertilizer application control device 72 corrects the detection data of the fertilizer concentration sensor 71 based on the detection data of the temperature sensor 73, and the detection data after the correction is used. Based on this, the feed amount adjusting device 8 is controlled to increase or decrease the fertilizer feed amount to change the fertilizer application amount of the fertilizer application device 5. Thereby, it becomes possible to change the fertilization amount to an appropriate amount in accordance with the change in energization resistance or electrical conductivity due to the difference in soil temperature, and the fertilization adjustment accuracy can be improved by a simple measurement method.

  In this way, since it is possible to acquire data used as a reference when performing fertilization work in the same field or a similar environment, when storing the acquired data in the fertilization amount control device 72, fertilization is performed based on this data. By automatically changing the fertilization amount of the device 5, fertilization control after the next time is improved.

  In addition, the optimum fertilization work can be performed based on the data in the acquired data box 76, and the fertilizer application amount control device 72 controls the traveling vehicle body 2 to travel along a desired travel route. Can be achieved.

  Further, the detection data of the fertilizer concentration sensor 71, the detection data of the temperature sensor 73, and the detection data of the tiller depth sensor 74 are integrated, and the feeding amount adjusting device 8 of the control device 72 is controlled based on the integrated data. Then, the fertilizer application amount of the fertilizer application device 5 may be changed. As a result, the amount of fertilization can be changed to an appropriate amount following the change in the working conditions, and the accuracy of fertilizing can be further improved and can be adapted to various working conditions.

  Here, the fertilizer application amount control device includes a fertilizer concentration sensor 71 that detects the fertilizer concentration in the soil while fertilizing and running, and a fertilizer application amount control device 72 that calculates the fertilizer application amount based on the detection of the fertilizer concentration sensor 71. Thus, in the fertilizer that applies the calculated fertilizing amount by driving the feeding roll 13, the fertilizer is moved by the adjusting motor 6 output by the fertilizing amount control device 72 and the spiral shaft 7 rotated by the adjusting motor 6. The indicator needle 9 is provided, and the fertilizer adjustment device 8 that adjusts the feeding amount by the feeding roll 13 is adjusted in conjunction with the adjusting motor 6, and the indicator needle 9 is moved. By detecting with the stroke sensor 14, the detected value by the stroke sensor 14 coincides with the fertilization amount value calculated by the fertilization amount control device 72. Te configured to stop driving of the adjusting motor 6.

  The fertilizer concentration sensor 71 detects the concentration of the fertilizer component in the soil as the vehicle travels, and the fertilizer application controller 72 drives the adjustment motor 6 while calculating the fertilizer application amount in the soil at the travel position. Accordingly, the fertilizer application amount adjustment device 8 for adjusting the fertilizer application amount or the supply amount of the fertilizer application device 4 by the supply roll 13 is adjusted in conjunction with movement of the indicator needle 9.

  The movement of the indicating needle 9 is detected by the stroke sensor 13, and when the indicating needle 9 reaches the position of the facility fertilizer value calculated by the fertilizing amount control device 72, the driving of the adjusting motor 6 is stopped. Then, the adjustment of fertilizer amount is stopped.

  Further, the fertilizer application control device 72 for calculating the appropriate fertilizer application amount calculates the fertilizer application amount by the detection by the fertilizer concentration sensor 71 and the detection by the tiller depth sensor 74 for detecting the depth of the soil tiller. To be configured.

  The fertilization amount calculated by the fertilization amount control device 72 is determined by the fertilizer concentration detected by the fertilizer concentration sensor 71 and the detection by the tiller depth sensor 74 for detecting the depth of the soil layer to be fertilized. The amount of fertilizer applied to the traveling soil position is calculated. Under the detection conditions by these sensors 71 and 74, the adjusting motor 6 is driven and the rotation of the feeding roll 13 is controlled to feed the fertilizer. While the fertilizer application amount is adjusted, the movement stop position of the indicator needle 9 is detected by the stroke sensor 14 while the indicator needle 9 is moved. Fertilizer is applied, and a small amount of fertilizer is applied in shallow soil, and the fertilizer concentration can be made uniform regardless of changes in soil depth and depth.

  Further, the spiral shaft 7 and the indicator needle 9 moved by the spiral shaft 7 are provided in a sensor case 16 provided with an indicator 15, and the movement position of the indicator needle 9 can be seen through from the outside of the sensor case 16. The form is as follows.

  As described above, the fertilizer concentration on the soil surface during fertilization traveling is controlled by the fertilizer concentration sensor 71 and the adjustment motor 6 is operated to output the fertilizer amount adjustment device 8 and the indicator needle 9 is moved. The operator can see the movement state of the indicating needle 9, the indicating needle 9 detected by the stroke sensor 14, the stop instruction position, and the like from the outside of the sensor case 16.

  The fertilizer application device 5 is mounted on a rear frame 19 at the rear of the vehicle body 2. The seedling planting device 4 is mounted on the rear side through a lifting link 3 pivotally attached to the lower side, and is lifted and lowered by the expansion and contraction of the lifting cylinder 53. The seedling tank 51 and the planting device 52 of the seedling planting device 4 are a double-row planting planted for each leveling track that leveles the left and right sides of the center float 55 and each side float 56, and has a total six-row planting form. However, according to this, the fertilizer application device 5 is set to a six-row fertilization form in which fertilization is performed for each planting line, or a three-row fertilization form in which fertilization is applied to one line for each float.

  The fertilizer application devices 5 are arranged in parallel in the horizontal direction, and the feeding rolls 13 having a feeding groove having a fixed volume formed on the rotating peripheral surface are arranged along the feeding shaft 21, and are rotated in the feeding case 20. The fertilizer which consists of the powder, granule, etc. which flow-down-feeds from the fertilizer hopper 60 is made to fit in a feeding groove, and it pays out. The feeding shaft 21 is rotated in conjunction with the gears 22 and 23 of the interlocking shaft 27 that is interlocked with the PTO shaft 36 of the transmission case 12, and has a constant interlocking ratio with the transmission rotation of the front wheels 10 and the rear wheels 11. It is the form which it has and is rotated by transmission and carries out feeding fertilization.

  A blower duct 25 and a fertilizer recovery duct 28 are arranged along the lateral direction before and after each of the feeding cases 20, and one side end thereof is switched from the blower 29 by a switching valve so that the blower duct 25 or the recovery duct 28. To blow. In a form in which a discharge port 26 is inserted into the fertilizer cylinder 24 at the lower portion of the feeding case 20, the fertilizer fed by the feeding roll 13 is received and conveyed to the fertilizing hose 62 by blowing air blown from the blowing duct 25. is there. Each fertilization hose 62 is applied by ejecting fertilizer into a groove formed by the fertilization guide 63 with the discharge port at the lower end of the fertilization hose 62 being looked over the fertilization guide 63.

  The lower end portion of the fertilizer hopper 60 is communicated with the supply port 18 on the upper side of the feeding case 20 so that the fertilizer in the hopper 60 flows into the feeding roll 13 chamber. The fertilizer amount adjusting device 8 for adjusting the fertilizer amount can be opened and closed by providing a shutter 40 at the supply port 18 part, and an adjustment plate 41 that can be moved and adjusted in the front-rear direction is provided below the shutter 40. The amount of fertilizer supplied to the feeding roll 13 can be adjusted by adjusting the opening degree of the supply port 18 by the adjusting plate 41.

  The adjustment plate 41 has a rack on the lower surface and meshes with a pinion of the adjustment shaft 42, and is moved and adjusted by meshing the pinion by the rotation of the adjustment shaft 42. The adjusting shaft 42 that moves the adjusting plate 41 is rotated by the adjusting motor 6 via the helical shaft 7, the bell crank 43, the link rod 44, the link arm 45, the gears 46, 47, etc. The opening degree of the adjustment plate 41 is adjusted. The bell crank 43 is rotatable about the swing shaft 48 on the rear frame 19, and the tip end portion of the adjustment rod 42 is fitted to the upper end of the bell crank 43 by an interlocking pin 49 so as to be rotatable up and down.

  The adjustment motor 6, the stroke sensor 14, the spiral shaft 42, the sensor case 16, and a linkage mechanism such as a link mechanism or a gear mechanism that links the adjustment shaft 42 from the spiral shaft 42 are provided in a feeding case in which the feeding roll 13 is housed. The sensor case 16 and the adjustment motor 6 are arranged on the front side of the feeding case 20 and the driver seat 21 side, and the driver sees through the indicator 15 and the position of the indicator needle 9 in the center case 16. It is easy.

  In addition, in FIG. 6, the pointer 9 that is moved back and forth by screwing the boss portion 49 to the spiral shaft 7 is moved by applying a laser beam by the stroke sensor 14 located on the adjustment motor 6 side. However, instead of this configuration, the cylinder 69 fixed at a fixed position on the sensor case 16 side and the spindle 70 integrated on the indicator needle 9 side are fitted and expanded and indicated as shown in FIG. A configuration of the stroke sensor 14 that detects the amount of movement of the needle 9 may be employed.

  8 and 9, reference numeral 80 denotes the axle of the front traveling wheel 10, 81 denotes a rotating side electrode of the slip ring 64 that rotates integrally with the axle 80 and is joined to the conductive plate 17, and 82 denotes a steering case, which supports the axle 80. At the terminal end of the axle housing 93, it is provided so as to be steerable and rotatable around the kingpin shaft 84, and is steered and linked by operation of the steering handle 34.

  A rotating side electrode 81 and a fixed side electrode 83 of a contact that contacts the rotating side electrode 81 are provided inside the steering case 82, and the conductive plate 17 is connected to the rotating side electrode 81 and the fixed side electrode 83 by sliding contact. The space between the fertilizer application control device 72 and the fertilizer application amount control device 72 is always set in a conductive state.

  Here, a fertilizer concentration sensor 71 for detecting the fertilizer concentration in the soil is mounted as a conductive plate 17 on the axle 80 of the front wheel 10, and the front axle housing 93 that mounts the axle 80 is rotated together with the axle 80. The slip ring 64 and a pair of conductive brushes 67 and 68 that are in sliding contact with the upper portion of the rotational peripheral surface 65 of the slip ring 64 are provided.

  When the fertilizer machine body 2 is fertilized, the left and right conductive plates 17 provided on the axle 80 together with the front wheels 10 are stepped into the soil and rotated, and the fertilizer contained in the soil is determined by the conductivity between the left and right conductive plates 17. The concentration of is detected. The conductivity between the conductive plates 17 is energized from the conductive plate 17 to the fertilizer application control device 72 via the slip links 64 and the conductive brushes 67 and 68 that are in sliding contact with the rotating peripheral surface 65 of the slip ring 64. Since the slip link 64 and the conductive brushes 67 and 68 are arranged as a pair of front and rear along the rotary peripheral surface 65, either the front or rear conductive brush 67 or 68 is slidably contacted with the rotary peripheral surface 65 of the slip ring 64. To maintain an accurate and stable electric conduction and detection state. Further, since the outer peripheral portions of the slip ring 64 and the conductive brushes 67 and 68 are covered with the front axle housing 93 to prevent the intrusion of muddy water or the like, the accurate fertilizer concentration is maintained.

  84 is a vertical kingpin shaft that deviates outward in the lateral direction of the traveling vehicle body 2 toward the lower side, 85 is a pair of bevel gears that are transmitted from the kingpin shaft 84 to the axle 80, 86 is a harness that conducts electricity to the fixed side electrode 83, and 87 is A guide pipe arranged so as to deviate outwardly in the left-right direction of the traveling vehicle body 2 along the kingpin shaft 84 as viewed from the front of the machine body, 88 is a harness that conducts electricity to the rotation-side electrode 81, and 89 is for passing the harness 88 A hole 90 is a spoke portion of the traveling wheel 10, 91 is a pair of fixtures for fixing the conductive plate 17 to the spoke portion 90, 92 is a wheel cap of the traveling wheel 10, and 93 is a front axle housing.

  The conductive plate 17 has a circular outer shape whose outer periphery is smaller than the outer peripheral diameter of the front traveling wheel 10, and the center of this circle is fitted to the axle 80 so that it is within the lateral width of the front traveling wheel 10, that is, the traveling vehicle body 2. It is arranged on each of the left and right sides. A rotating side electrode 81 that rotates integrally with the axle 80 and connects to the conductive plate 17, and a stationary side electrode 83 that is provided in the steering case 82 that supports the axle 80 and contacts the rotating side electrode 81 are provided. It is comprised so that between the plate 17 and the fertilization control apparatus 72 may supply with electricity.

  As described above, the conductive brushes 67 and 68 provided in the front axle housing 93 have the arm 77 attached to the right upper end portion (see A in FIG. 9), and the conductive brushes 67 and 68 on the front and rear end portions of the arm 77. Are attached to the rotating peripheral surface 65 of the slip ring 64 by springs 78, respectively. The conductive brushes 67 and 68 are configured so as to be detachable from the outer peripheral surface of the axle housing 93 through the mounting holes 79, and the mounting holes 79 can be opened and closed with a cap.

  Further, the arm 77 and the conductive brushes 67 and 68 can be arranged at positions deviated from the position directly above the axle 80 by an appropriate angle back and forth (see B in FIG. 9). Further, the electric brushes 67 and 68 are slidably contacted so as to sandwich the rotating peripheral surface 65 of the slip ring 64 as a leaf spring form.

  Next, mainly based on FIG. 11, the conductive plate 17 of the fertilizer concentration sensor 71 is formed in the form of a plate ring along the inner surface of the rim diameter portion of the wheel 10 and fixed to the tip portion of each spoke portion 90. Install with tool 95. The harness 88 of the fertilizer concentration sensor 71 is connected in a waterproof state through a pipe 97 attached along the spoke 90 from the hole 89 of the axle 80. Further, the outer periphery of the axle housing 93 and the steering case is covered with an axle cover 98 to maintain waterproofness.

  Further, based on FIG. 12, the lower end portion of the mascot 33 at the front end portion of the vehicle body 2 is attached to and supported on a T-shaped handle frame 57 protruding forward and upward from the vehicle body 2 so as to be able to rotate forward and backward. A handle ring 59 is provided on the front side of the center mascot 33. The handle ring 59 has a vertically long shape that covers the front surface of the front mask 58 and has an upper side formed in a loop shape. The handling 59 can be easily gripped, and the center mascot 33 can be tilted independently.

  Further, an emergency stop switch 54 is provided at the upper end portion of the handle frame 57 so as to be located on the inner side of the handle ring 59 and can be interlocked so as to stop the engine.

DESCRIPTION OF SYMBOLS 5 Fertilizer 6 Adjusting motor 7 Spiral shaft 8 Fertilizer amount adjuster 9 Support needle 10 Front wheel 14 Stroke sensor 15 Indicator 16 Sensor case 17 Conductive plate 64 Slip ring 65 Rotating circumferential surface 67 Conductive brush 68 Conductive brush 71 Fertilizer concentration sensor 72 Fertilizer Quantity control device 74 Plowing depth sensor

Claims (4)

A fertilizer concentration sensor (71) that detects the fertilizer concentration in the soil while running fertilizer and a fertilizer amount control device (72) that calculates the fertilizer amount based on the detection of the fertilizer concentration sensor (71) are provided, and the fertilizer amount control In the seedling transplanting machine provided with the fertilizer applied so that the amount of fertilization calculated by the device (72) can be controlled by reflecting the amount of fertilization calculated in the drive of the feeding roll (13).
An adjustment motor (6) driven and controlled by the fertilizer application control device (72) and an indicator needle (9) moved to a helical shaft (7) rotated by the adjustment motor (6) are provided, and the adjustment motor The fertilizer amount adjusting device (8) for adjusting the feed amount by the feed roll (13) is adjusted in conjunction with (6) and the indicator needle (9) is moved, and the amount of movement of the indicator needle (9) is determined as a stroke. Stopping the drive of the adjusting motor (6) when the value detected by the sensor (14) and the value detected by the stroke sensor (14) coincides with the fertilization amount value calculated by the fertilization amount control device (72). A seedling transplanter characterized by.   The fertilizer application control device (72) for calculating an appropriate fertilizer application amount applies fertilizer from the detected value of the fertilizer concentration sensor (71) and the detected value of the tillage depth sensor (74) for detecting the depth of the soil tillage. The seedling transplanter according to claim 1, wherein the amount is calculated.   The spiral shaft (7) and the indicator needle (9) moved by the spiral shaft (7) are arranged in a sensor case (16) provided with an indicator (15), and the movement position of the indicator needle (9) The seedling transplanting machine according to claim 1 or 2, characterized in that said can be seen through from the outside of the sensor case (16).   A fertilizer concentration sensor (71) for detecting the fertilizer concentration in the soil is mounted as a conductive plate (17) on the axle (80) of the front wheel (10), and the front axle housing 93 that mounts the axle (80) is mounted on the front axle housing 93. A slip ring (64) that rotates integrally with the axle (80), and a pair of conductive brushes (67, 68) that are in sliding contact with the upper part of the rotational peripheral surface (65) of the slip ring (64) are provided. The seedling transplanter according to any one of claims 1 to 3.

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