JP2009249961A - Ground leveling work device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ground leveling work device capable of performing sufficient ground leveling, in spite of its simple constitution. <P>SOLUTION: The ground leveling work device 7 can be mounted on a dump truck 1 equipped with a vertically movable dump type deck 2, and can vertically move the blade provided between the front wheels 4 and rear wheels 5 of the dump truck 1, interlocked with the deck 2. The blade is extended laterally passing below, for example, the lower portion of the dump truck 1, and is detachably mounted to the deck 2 with support sections. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a leveling work apparatus, and more particularly to a leveling work apparatus that can be mounted on a vehicle having a dump-type loading platform that can move up and down.

  For example, school playgrounds initially have a soft surface with little unevenness, but it is known that a clay layer deposits on the sand and gravel layer after a certain period of use and the surface becomes hard in an uneven state. ing. In such a case, the clay layer on the surface is excavated and mixed with the sand / gravel layer using, for example, a bucket of a hydraulic excavator or a soil discharge plate, and then returned to the original playground.

  However, if the undulation of the surface is large, the undulation cannot be eliminated even if excavation is performed using a bucket of a hydraulic excavator or a dumping board. In such a case, for example, a dedicated heavy machine called a motor grader is used. It was. Here, the blades were moved up and down by the left and right lifting cylinders with respect to the vehicle body having a long distance between the wheel bases, and even on a surface with a large swell, the swells could be eliminated evenly. .

  Moreover, in patent document 1, it is a leveling work vehicle connected to a relatively light tractor or the like without using the heavy machinery as described above. A connecting means serving as a connecting portion, a blade provided between the front wheel and the rear wheel provided on the frame and capable of moving up and down at least with respect to the road surface and tilting with respect to the traveling direction, and lifting and tilting the blade A leveling work vehicle having a drive device is disclosed.

In Patent Document 2, a leveling machine connected to a light truck or the like, which is a long H-shaped steel blade extending left and right for leveling the ground, a support frame for supporting the blade, A pair of rollers rotatably mounted on the left support portion and the right support portion of the support frame, a pair of vertical movement mechanisms interposed between the left support portion, the right support portion and the blade, and a pair of rollers; A tilt mechanism and a connecting mechanism for connecting the blade to a light truck or the like, and the pair of vertical movement mechanisms move the blade in the vertical direction relative to the support frame, thereby There is disclosed a leveling machine configured to adjust an inclination angle between a blade and a ground leveling. Note that both the vertical movement mechanism and the tilting mechanism are manually operated on the machine side.
JP 2004-308303 A JP 2004-190299 A

  However, in Patent Document 1, although heavy machinery such as the hydraulic excavator and motor grader is not used, as with these heavy machinery, a dedicated drive device for moving the blade up and down and tilting is provided, which is relatively complicated. It has a configuration. On the other hand, in the above-mentioned document 2, since such a driving device is not provided, the ground leveling machine is lightweight, but the blade jumps on the hard surface in the concavo-convex state although it has a relatively simple configuration. In that case, in the above-mentioned document 2, since the vertical movement mechanism of the blade is manually operated on the machine side, the vertical movement of the blade cannot be adjusted while a light truck or the like connected to the leveling machine is traveling. For this reason, there was a problem that the force for pressing the blade against the ground was insufficient and sufficient leveling work could not be performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a leveling work device that can perform sufficient leveling with a simple configuration.

  Usually, in a vehicle equipped with a dump type loading platform that can move up and down, the vertical movement of the loading platform can be operated from the cabin. This corresponds to the work of dropping the earth and sand on the loading platform little by little on the ground. Accordingly, the present invention provides a leveling work apparatus that can be mounted on a vehicle having a dump type loading platform that can move up and down, and is provided with a leveling plate for leveling the ground between a front wheel and a rear wheel of the vehicle. The ground leveling plate can be moved up and down in conjunction with the loading platform.

  According to the present invention, since the leveling plate provided between the front wheel and the rear wheel of the vehicle can be moved up and down in conjunction with the loading platform, a heavy machine such as a hydraulic excavator or a motor grader or a dedicated drive device is provided. Even if the vehicle is running, it is possible to move the leveling plate up and down and press the leveling plate against the ground simply by operating the vertical movement of the loading platform from the cabin. The leveling plate will not jump up and down, and sufficient leveling can be performed. As a result, it was possible to provide a leveling work device that can perform sufficient leveling with a simple configuration.

  According to a second aspect of the present invention, the leveling plate extends left and right through the lower part of the vehicle, and it is preferable that the leveling plate is detachably attached to the loading platform.

  According to the second aspect of the present invention, the leveling plate extends right and left through the lower part of the vehicle, and since the leveling plate is detachably attached to the loading platform, a simple configuration is obtained. Moreover, there is an economic advantage that it can be applied not only to newly designed vehicles but also to existing vehicles without major modifications.

  According to a third aspect of the present invention, the leveling plate is attached to a position where the leveling plate does not interfere with the lower part of the vehicle with the loading platform moved upward, and the leveling plate is moved to the ground by moving the loading platform downward. It is preferable to be configured so as to be pressed to the side.

  According to a third aspect of the present invention, the leveling plate is attached at a position where the leveling plate does not interfere with the lower part of the vehicle in a state where the loading platform is moved upward, and the leveling plate is moved to the ground by moving the loading platform downward. Since it is configured to be pushed down to the side, it is convenient that the leveling plate can be easily attached or replaced.

  According to a fourth aspect of the present invention, a first member that is detachably attached to the loading platform, and a second member that is detachably attached to the first member and is fixed to the leveling plate. It is preferable that when the loading platform is moved upward, the leveling plate does not interfere with the lower part of the vehicle by shifting the second member in the direction of dropping from the first member.

  According to a fourth aspect of the present invention, a first member that is detachably attached to the loading platform, and a second member that is detachably attached to the first member and is fixed to the leveling plate. And when the platform is moved upward, the leveling plate is prevented from interfering with the lower part of the vehicle by shifting the second member in the direction of dropping from the first member. Can be reliably prevented.

  Alternatively, as in the fifth aspect of the invention, the leveling plate extends to at least one of the left and right sides while avoiding the lower portion of the vehicle, and it is preferable that the leveling plate is detachably attached to the loading platform.

  According to the fifth aspect of the present invention, the leveling plate extends to at least one of the left and right sides while avoiding the lower portion of the vehicle, and since the leveling plate is detachably attached to the loading platform, the configuration can be simplified. The leveling plate can reliably prevent interference with the lower part of the vehicle body. In addition, as described above, when the earth and sand placed on the loading platform is gradually dropped on the ground while traveling, the vehicle is driven by avoiding the dropped earth and sand so that the vehicle body does not ride on the earth and sand. It is convenient to perform leveling work with at least one of the right and left leveling boards.

  By the way, the earth and sand removed by the leveling board may obstruct the running of the vehicle. Therefore, as in the invention described in claim 6, it is preferable that the leveling plate can be inclined in the left-right direction.

  According to invention of Claim 6, since the said leveling board can incline in the left-right direction, the earth and sand removed with the leveling board can be pushed out to either the right or left, and it can prevent from obstructing driving | running | working of a vehicle. . Further, as described above, even when the leveling work is performed with at least one of the left and right leveling boards of the vehicle, the leveled earth and sand may enter the lower part of the vehicle body. Needless to say, it is also effective in traveling.

  As in the invention described in claim 7, it is preferable to provide a claw-like member for excavating the ground instead of the leveling plate.

  According to the seventh aspect of the present invention, since a claw-like member for excavating the ground is provided in place of the leveling plate, excavation work before leveling can be performed by the claw-like member.

  According to the present invention, since the leveling plate provided between the front wheel and the rear wheel of the vehicle can be moved up and down in conjunction with the loading platform, a heavy machine such as a hydraulic excavator or a motor grader or a dedicated drive device is provided. Even if the vehicle is not in use, it is possible to move the leveling plate up and down and press the leveling plate against the ground simply by operating the vertical movement of the loading platform from the cabin. In contrast, the leveling plate does not jump up and down, and sufficient leveling can be performed. As a result, it was possible to provide a leveling work device that can perform sufficient leveling with a simple configuration.

  FIG. 1 is a side view showing a schematic configuration of a dump truck 1 equipped with a leveling work device 7 according to an embodiment of the present invention (a state in which a loading platform 2 is swung downward), and FIG. 3 is an overall view of the leveling work device 7. FIG. 4 is an exploded perspective view showing a partial configuration of the leveling work device 7, and FIG. 5 is a circuit diagram showing a hydraulic control system of the dump truck 1.

  In FIG. 1, the left side is referred to as the front side, the right side is referred to as the rear side, and the direction perpendicular to the paper surface is referred to as the left-right direction. The same applies to the following drawings.

  As shown in FIGS. 1 and 3, the leveling work device 7 according to the present embodiment is mounted on a dump truck (an example of a vehicle) 1 including a dump-type loading platform 2 that can move up and down. is there. The dump truck 1 includes a cabin 3 for an operator to perform various operations, a front wheel 4 below the cabin 3, and a rear wheel 5 below the loading platform 2. The mounted engine 6 can be driven by driving the rear wheel 5 through a drive shaft (not shown).

  As shown in FIG. 5, the dump truck 1 includes a hydraulic cylinder 11 for swinging the loading platform 2 in the vertical direction with respect to the base 21. The inside of the hydraulic cylinder 11 is divided into a lower oil chamber 11a and an upper oil chamber 11c by a piston 11b connected to a piston rod 11d. The hydraulic cylinder 11 supplies and discharges pressure oil supplied from a hydraulic pump 12 driven by the engine 6 to and from both oil chambers 11a and 11c via a control valve 13 and lines L1 to L4. 11d is expanded and contracted, and thereby the loading platform 2 is swung upward, or the loading platform 2 is swung downward. Here, the hydraulic cylinder 11 directly swings the loading platform 2 in the vertical direction with respect to the base 21, but it goes without saying that a link mechanism or the like may be interposed.

  The control valve 13 performs supply / exhaust switching to both the oil chambers 11a and 11c of the hydraulic cylinder 11 by operating the operation lever 13d. For this reason, the control valve 13 can select any one of the supply position 13a, the neutral position 13b, and the discharge position 13c by operating the operation lever 13d. The hydraulic pump 12 adjusts the amount of pressure oil supplied to and discharged from the hydraulic cylinder 11 by adjusting the output of the engine 6, whereby the moving speed of the hydraulic cylinder 11 is adjusted. Note that both the operation of the operation lever 13d and the output adjustment of the engine 6 can be performed in the cabin 3, so that the vertical movement of the loading platform 2 can be operated from the cabin 3. This corresponds to the work of dropping the earth and sand placed on the loading platform 2 little by little on the ground.

  As shown in FIG. 3, a blade 71 of the leveling work device 7 is provided at a substantially intermediate position between the front wheel 4 and the rear wheel 5 of the dump truck 1 (A≈B in FIG. 1). The blade 71 is detachably attached to the left and right side plates of the loading platform 2 by support portions 72 and 73. For this reason, the present ground leveling work device 7 has an economic merit that it can be applied not only to the newly designed dump truck 1 but also to the existing dump truck 1 without major modification.

  The support portion 73 includes, for example, a first support member 731 that is bolted to the side plate of the loading platform 2, a second support member 732 that extends downward from the rear end of the first support member 731 toward the blade 71, and a first support A third support member 733 that extends downward from the front end of the member 731 and connects to an intermediate portion of the second support member 732 to reinforce the second support member 732. As shown in FIG. 4, the support portion 72 is fixed to, for example, a blade 71, and the tip of the second support member 732 is fitted into the tip of the support portion 72 so as to be detachable. The blade 71 corresponds to a leveling plate, the first support member 731, the second support member 732, and the third support member 733 of the support portion 73 correspond to the first member, and the support portion 72 corresponds to the second member. .

  The blade 71 is made of a steel material having a cross-sectional arc shape or a flat plate shape, and has a long shape extending left and right through the lower portion of the dump truck 1. The lower end of the blade 71 may be provided with a cutting edge called a cutting edge.

  The support portion 72 is made of a steel plate having a substantially square cross section, extends from the blade 71 to the left and right, and has its tip end bent and facing upward.

  Each of the first support member 731 to the third support member 733 of the support portion 73 is made of steel having a substantially square cross section, and one end of the second support member 732 is interposed via the first support member 731. For example, it is detachably attached to the loading platform 2 by bolt fastening, and the other end has a downward sleeve shape so that it can be inserted into and removed from the support portion 72.

  Then, when the loading platform 2 is swung upward, the blade 71 is separated from the lower portion of the dump truck 1 by shifting from the other end of the second support member 732 of the support portion 73 in a direction in which the tip of the support portion 72 is dropped. It is designed not to interfere. Note that the fixing portion of the support portion 72 to the blade 71 has a structure capable of adjusting the angle of the blade 71 in the left-right direction, for example, by inserting a spacer (not shown).

  Hereinafter, the usage example of this leveling work apparatus 7 is demonstrated. FIG. 2 is a side view showing a schematic configuration of the dump truck 1 on which the leveling device 7 according to the embodiment of the present invention is mounted (a state where the loading platform 2 is swung upward).

  First, as shown in FIG. 2, the loading platform 2 is slightly swung upward. For this reason, the hydraulic pump 12 is driven by the engine 6 in FIG. The hydraulic pump 12 supplies the oil sucked from the oil tank 14 to the control valve 13 through the line L1 as an appropriate pressure oil. At this time, since the spool position of the control valve 13 is in the neutral position 13b, the operation lever 13d is operated to switch to the supply position 13a.

  Pressure oil is supplied from the control valve 13 to the lower oil chamber 11a of the hydraulic cylinder 11 to push up the piston 11b. The pressure oil in the upper oil chamber 11c is discharged to the oil tank 14 through the lines L3, L4 and the control valve 13. As a result of the piston rod 11 d of the hydraulic cylinder 11 extending and pushing the loading platform 2 upward with respect to the base 21, the loading platform 2 rotates a little clockwise around the fulcrum 22 on the base 21. When the spool position of the control valve 13 is returned to the neutral position 13b at the desired position, the swinging of the loading platform 2 stops at that point.

  In this state, the first support member 731 of the support portion 73 is fixed to the loading platform 2. A second support member 732 and a third support member 733 are respectively attached to the front and rear of the first support member 731, and the support portion 72 is attached to the tip of the second support member 732 via a temporary fixing pin, for example. Since the blade 71 fixed to is attached, the blade 71 is attached in a state of slightly floating from the ground. In this way, the blade 71 can be easily attached or replaced, which is convenient.

  Thereafter, the operation lever 13d of the control valve 13 is operated to switch the spool position from the neutral position 13b to the discharge position 13c. The hydraulic pump 12 supplies the oil sucked from the oil tank 14 as an appropriate pressure oil to the control valve 13 through the line L1. At this time, the pressure is supplied from the control valve 13 to the upper oil chamber 11c of the hydraulic cylinder 11 through the line L3. Oil is supplied to push down the piston 11b. The pressure oil in the lower oil chamber 11a is discharged to the oil tank 14 through the lines L2, L4 and the control valve 13. As a result of the piston rod 11d of the hydraulic cylinder 11 being contracted and pushing the loading platform 2 downward with respect to the base 21, the loading platform 2 rotates counterclockwise about the fulcrum 22 on the base 21 as shown in FIG. Become.

  Thereby, since the blade 71 is pressed against the ground, the dump truck 1 can be moved forward in that state to perform leveling work. At that time, for example, by inserting a spacer (not shown) between the blade 71 and the support portion 72 so that the blade 71 is inclined to the left or right, the earth and sand removed by the blade 71 is left or right. It can be pushed out so as not to obstruct the running of the dump truck 1.

  Further, instead of the blade 71, a claw-like member (not shown) can be provided. The claw-like member is composed of a plurality of pins that are tip portions and a shank that is a handle portion, and the dump truck 1 is advanced while the pins are inserted into the ground, thereby scratching the ground. I do. Thereby, when the ground is very hard, excavation work and mixing work before leveling can be performed.

  Further, when the pressing force of the blade 71 or the claw-like member on the ground is insufficient, a weight may be mounted on the loading platform 2 to increase the pressing force.

  As described above, according to the leveling work device 7 of the present embodiment, the blade 71 provided between the front wheel 4 and the rear wheel 5 of the dump truck 1 moves up and down in conjunction with the loading platform 2 of the dump truck 1. Because it is possible to move, the blade 71 can be moved up and down simply by operating the platform 2 from the cabin 3 while the dump truck 1 is running, without using heavy equipment such as a hydraulic excavator or motor grader or a dedicated drive device. By moving the blade 71 and pressing the blade 71 against the ground, the blade 71 is less likely to jump on a hard surface with unevenness, and sufficient leveling can be performed.

  During leveling, the blade 71 may be slightly lifted due to the undulation of the ground. In this case, the support portion 72 is displaced in the direction of falling off from the support portion 73. Thus, the blade 71 does not interfere with the lower portion of the dump truck 1.

  In addition, unlike the above, by providing a position sensor for the blade 71 and stopping the hydraulic pump 12 with an output signal from the position sensor, it is possible to reliably prevent the blade 71 from interfering with the lower portion of the dump truck 1. become able to.

  FIG. 6 is a perspective view showing an example of the overall configuration of the leveling work device 7 according to a modification. In the above embodiment, the blade 71 extends left and right through the lower portion of the dump truck 1 and is supported by the support portions 72 and 73 from the cargo bed 2. For example, as shown in FIG. 712 extends to the left and right while avoiding the lower portion of the dump truck 1, and supports the blades 711, 712 directly from the loading platform 2 with left and right support portions 73 (731, 732, 733) and reinforcing members (not shown). It may be. Further, it is not always necessary to provide both of the blades 711 and 712, and only one of the blades 711 and 712 may be provided. In those cases, interference between the blade 71 and the lower portion of the dump truck 1 can be more reliably prevented with a simpler configuration. Further, as described above, when the earth and sand placed on the loading platform 2 are gradually dropped on the ground while traveling, the dump truck 1 rides on the earth and sand by running the dump truck 1 while avoiding the dropped earth and sand. In addition, it is convenient that the leveling work can be performed by either the left or right blade 711 (or 712).

  Moreover, in the said embodiment, although the 1st support member 731 of the support parts 73 is bolted, for example to the left-right side plate of the loading platform 2, the 1st support member 731 is welded and fixed to the loading platform 2, and the 2nd The third support members 732 and 733 may be bolted to the first support member 731, for example. Also in this case, the blade 71 can be detachably attached to the loading platform 2.

  In the above embodiment, as an example of the vehicle, the dump truck 1 including the left and right pairs of the front wheels 4 and the rear wheels 5 is illustrated, but the distance between the wheel bases for interposing the blades 71 is illustrated. Of course, it is better to be as large as possible. In that case, there may be two or more rear wheels. Moreover, in the said embodiment, although the loading platform 2 illustrated what can rock | fluctuate to an up-down direction, the trailer etc. which can raise / lower the loading platform 2 to an up-down direction may be sufficient.

  Further, the scope of application of the present invention is not limited to the dump truck 1, but may be any vehicle provided with other dump type loading platforms that can move up and down. Also, some vehicles have an outrigger that moves the vehicle up and down while being supported from the ground, and the blade 71 is attached to the lower portion of the vehicle body by slightly lifting the vehicle body from the ground by using the expansion and contraction of the outrigger. In this case, the outrigger cannot be expanded and contracted while the vehicle is traveling, and therefore the blade 71 during traveling cannot be moved up and down. In addition, it is conceivable to attach the blade 71 to the lower part of the vehicle body with only the front wheel of the vehicle placed on a steep slope, for example. In this case, the blade 71 can be moved up and down in the same manner. Can not.

1 is a side view of a dump truck on which a leveling apparatus according to an embodiment of the present invention is mounted (a state in which a loading platform 2 is swung downward). It is a side view (state which made the loading platform 2 rock | fluctuate upward) of the dump truck in which the leveling work apparatus which concerns on this embodiment is mounted. It is a perspective view which shows the whole structure of the leveling work apparatus which concerns on this embodiment. It is a disassembled perspective view which shows the partial structure of the leveling work apparatus which concerns on this embodiment. It is a circuit diagram which shows the hydraulic control system of a dump truck. It is a perspective view which shows the example of whole structure of the leveling work apparatus which concerns on a modification.

Explanation of symbols

1 Dump truck (a type of vehicle)
DESCRIPTION OF SYMBOLS 11 Hydraulic cylinder 12 Hydraulic pump 13 Control valve 14 Oil tank 2 Loading platform 3 Cabin 4 Front wheel 5 Rear wheel 6 Engine 7 Leveling work apparatus 71 Blade (equivalent to leveling plate)
72 support (corresponds to the second member)
73 Supporting part (corresponding to the first member)
731 First Support Member 732 Second Support Member 733 Third Support Member

Claims (7)

A leveling work device that can be mounted on a vehicle equipped with a dump type loading platform that can move up and down,
A leveling work apparatus comprising a leveling plate for leveling the ground between a front wheel and a rear wheel of the vehicle, wherein the leveling plate can be moved up and down in conjunction with the loading platform. .   2. The leveling work device according to claim 1, wherein the leveling plate extends left and right through a lower part of the vehicle, and the leveling plate is detachably attached to the loading platform.   The leveling plate is attached to a position where it does not interfere with the lower part of the vehicle when the loading platform is moved upward, and the leveling plate is pressed to the ground side by moving the loading platform downward. The leveling work apparatus according to claim 2.   A first member detachably attached to the loading platform; and a second member that is detachable with respect to the first member and fixed to the leveling plate, and the loading platform is moved upward 4. The leveling work device according to claim 2, wherein the leveling plate does not interfere with a lower portion of the vehicle when the second member is displaced in a direction of dropping from the first member.   The leveling work apparatus according to claim 1, wherein the leveling plate extends to at least one of the left and right sides while avoiding a lower portion of the vehicle, and the leveling plate is detachably attached to the loading platform.   The leveling work apparatus according to any one of claims 1 to 5, wherein the leveling plate is tiltable in a left-right direction. The leveling work device according to any one of claims 1 to 6, wherein a claw-like member for excavating the ground is provided in place of the leveling plate.

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