JP6403563B2 - Transportation work vehicle - Google Patents

Description

  The present invention relates to a transport work vehicle capable of side dumping a loading platform.

  The side dump type transport work vehicle described in Patent Document 1 below is known as a side-dump type transport work vehicle in which the load platform is inclined in a direction orthogonal to the traveling direction of the transport work vehicle and the transported goods loaded on the load platform are carried out. Yes.

  This transport work vehicle is equipped with an outrigger that prevents the vehicle body from swinging during side dumping of the cargo bed. The outrigger supports the vehicle body during side dumping to prevent the vehicle body from swinging during side dumping of the cargo bed. The body is prevented from falling.

JP 2002-187475 A

  According to the prior art of Patent Document 1, by supporting the vehicle body at the time of side dumping with the outrigger, the vehicle body can be prevented from falling and safe work can be performed.

  However, since the outrigger according to the prior art of Patent Document 1 is such that a leg member that is elastically expanded and contracted is attached to the distal end portion of a telescopic arm that protrudes toward the side of the vehicle body. When a load due to the inclination of the leg member is applied to the leg member, the leg member contracts due to the load, and as a result, the vehicle body swings.

  In addition, since a leg member that is telescopically expanded and contracted is attached to the tip of a telescopic arm that protrudes toward the side of the vehicle body, another transport work vehicle, a container, or the like is disposed on the side of the vehicle body. There is also a problem that the space is limited and it becomes difficult to carry the conveyed product during the side dump.

  Furthermore, when the ground is soft, the leg members are buried in the ground due to the weight of the vehicle body, and the vehicle body cannot be kept horizontal, and the vehicle body tilts during side dumping.

  Further, when the transport work vehicle is driven, the outrigger is stored. However, since the outrigger having the above-described configuration generally has a slow storage operation, the arm does not notice that the outrigger is in the storage operation after the transfer work. There was a case where the transport work vehicle was caused to travel in a state of protruding to the side of the vehicle body. It is not only dangerous to move the transport work vehicle with the arm protruding to the side of the vehicle body, but the arm touches another transport work vehicle or container placed on the side of the vehicle body. In some cases, each part of the transport work vehicle including the arm, and other parts of the transport work vehicle and the container are damaged.

  This invention makes it an example of a subject to cope with such a problem. In other words, it is possible to prevent vertical movement of the transport work vehicle during side dumping, and to secure a space for placing other transport work vehicles and containers on the side of the transport work vehicle to carry out the work to carry out the transported goods. It can be easily done, even if the ground is soft, the transport work vehicle can be prevented from tilting during side dumping, each part of the transport work vehicle during traveling after unloading work, each part of other transport work vehicles and containers It is an object of the present invention that damage can be prevented.

  In order to achieve such an object, a transport work vehicle according to the present invention has at least the following configuration.

A transport work vehicle capable of side dumping in which a loading platform is tilted in a direction orthogonal to the traveling direction of the transport work vehicle and a transported object loaded on the load platform is carried out, the transport work vehicle including a link mechanism A frame that supports the loading platform so as to be capable of side dumping via a shaft, a shaft support provided on the frame, and a shaft support that is rotatable about an axis orthogonal to the traveling direction of the transport vehicle. a pair of axles before and after the, a wheel which is pivotally supported coaxially with the axle, is bridged across said shaft support and said frame, and a hydraulic cylinder to expand and contract to follow the vertical movement of the wheel, of the loading platform A locking device that locks the hydraulic cylinder so as not to extend and contract in a side dump state, and the shaft support portion has an axis parallel to the axle and is disposed between a pair of the axles. Axis The hydraulic cylinder is rotatably supported on the center, and the hydraulic cylinder is disposed at least on the axial support portion side on the side where the cargo bed side dumps, and the locking device causes liquid to flow with respect to the hydraulic cylinder. And an open / close valve that enables expansion and contraction of the hydraulic cylinder and disables expansion and contraction of the hydraulic cylinder by stopping the flow of liquid with respect to the hydraulic cylinder. The lever that is pivotally supported by the valve stem rotates so that the valve stem of the on-off valve rotates together with the valve stem in conjunction with the switching operation between the carrying state and the side dump state of the loading platform. Thus, the transport work vehicle is configured to switch between a liquid flowable state and a liquid flow stop state with respect to the hydraulic cylinder .

One end of the hydraulic cylinder which is connected to the shaft supporting portion side, it is luck transportable work vehicle you wherein disposed in front of the said support shaft.

An edge on the carry-out side of the opening for carrying in / out of the conveyed product is provided with an extension plate extending in the carry-out direction of the conveyed product from the edge, and the extension plate is The bearing is rotatably supported around an axis parallel to the traveling direction of the transport vehicle, and is rotated toward the opening by an urging portion arranged so as to span the extension plate and the opening. it is luck transportable work vehicle you characterized that is biased to rotate to the opposite side with respect to.

Some of the tips of said extension elongated plate facing the axial support side of said extension plate, or the whole, it is luck transportable work vehicle you wherein the buffer portion to mitigate the contact impact is disposed.

  By having such a feature, the present invention can stop the expansion and contraction of the cylinder that expands and contracts following the operation of the wheel by the lock device, and thus prevents the vehicle body from swinging in the side dump without using the outrigger. be able to. In addition, since the outrigger is unnecessary, there is no side protrusion of the vehicle body due to this outrigger, and a space for placing other transport work vehicles, containers, etc. is secured on the side of the vehicle body to carry out the work to carry out the conveyed object. It can be easily performed, and even when the ground is soft, the body can be prevented from tilting when side dumping, and each part of the transport work vehicle, other transport work vehicles and containers of the transport work when traveling after unloading work Breakage of each part can be prevented.

It is a perspective view of the conveyance work vehicle of 1st embodiment which concerns on this invention, and shows the state before the side dump of a loading platform. It is a perspective view which shows the state which carried out the side dump of the loading platform in FIG. FIG. 3 is a sectional view taken along line (3)-(3) in FIG. 1. FIG. 2 is a front view of FIG. 1. The state which carried out the side dump of the loading platform in FIG. 4 is shown. FIG. 3 shows the expansion / contraction state of the hydraulic cylinder corresponding to the position of the wheel. FIG. 3 shows the expansion / contraction state of the hydraulic cylinder corresponding to the position of the wheel. It is a schematic block diagram of a locking device. FIG. 4 is an enlarged cross-sectional view of a main part of the line (9)-(9) in FIG. FIG. 9 shows a locked state of the hydraulic cylinder. It is a perspective view of the conveyance work vehicle of 2nd embodiment which concerns on this invention, and while making a loading platform side dump, it is a perspective view which shows the state which the extension plate contacted with the edge of the accommodating part and rotated. FIG. 12 is a front view of FIG. 11. FIG. 12 shows a state in which the extension plate does not contact the edge of the housing portion.

  Hereinafter, the conveyance work vehicle A of 1st embodiment which concerns on this invention is demonstrated based on FIGS. In addition, although the conveyance work vehicle A illustrated below is a thing of the structure which tow | pulls and drive | works by a tow vehicle (not shown). In the present invention, a self-propelled configuration such as a dump truck may be used.

  In the following, the forward direction (the connection portion A1 side in FIG. 1) of the transport work vehicle A is “front”, the reverse direction is “rear”, and the side dump is performed orthogonally with the forward direction and the plane direction (see FIG. 2). The direction is “left”, the side opposite to the side dumping direction is “right”, the ground G side is “down”, and the direction facing the ground G is “up”.

  The transport work vehicle A supports a pair of front and rear biaxial wheels W1 and W2, and a loading platform 1 is connected via a link mechanism L on a frame A2 having a connecting portion A1 connected to a towing vehicle. As shown in FIG. 2 and FIG.

  The loading platform 1 is in a bucket shape having an opening 10 on the upper side, and is formed in a shape that expands from the lower side toward the opening 10. By carrying out side dump so as to incline downward, a conveyed product (not shown) is carried out from the loading platform 1 via the carry-out edge 10C1 located at the lowest side of the opening 10 at the time of side dump. It has become so.

  The link mechanism L includes a slide rotation support portion L1 provided so as to extend between the support frame A20 disposed on the front and back of the loading platform 1 on the frame A2, the front side wall 10A and the rear side wall 10B of the loading platform 1, the frame A2 and the loading platform. The actuator L2 is provided so as to extend over one front side wall 10A and the rear side wall 10B.

  The slide rotation support portion L1 is configured by fitting a slide protrusion L10 integral with the loading platform 1 into a slide groove L11 provided in the support frame A20 with the vertical direction as a long side, as shown in FIGS. Further, the slide protrusion L10 is slidable along the longitudinal direction of the slide groove L11 and is supported rotatably in the slide groove L11 by the expansion and contraction of the actuator L2.

  The slide protrusion L10 is provided on the left side wall 10C, which is a side wall on the carry-out side, and is a part protruding forward of the front side wall 10A and a part protruding rearward of the rear side wall 10B of the rod L1A having a longitudinal axis. . The slide groove L11 is configured such that the opening axis of the slide groove L11 facing in the front-rear direction is parallel to the axis of the slide protrusion L10, the longitudinal direction is from the lower end to the upper end of the slide groove L11, and the side dump direction (left It is provided so as to be inclined in an oblique direction.

  Here, the carry-out edge 10C1 is an edge on the opening 10 side of the left side wall 10C, which is a carry-out side wall of the loading platform 1, and is adjacent to the work vehicle A and another work vehicle 100 (see FIG. 11)) is an edge located on the side where it is disposed.

  That is, when the slide protrusion L10 rises along the longitudinal direction of the slide groove L11, the slide protrusion L10 is raised in the diagonally left direction and guided to rotate in the left direction. Can be rotated to the left while being lifted in the diagonally left direction, whereby the loading platform 1 can be brought into a side dump state.

  Moreover, as shown in FIG.1, FIG.3, FIG.4, the loading platform 1 is in the state before the side dump (the state where the opening of the loading platform 1 is positioned on the upper side in the vertical direction, the transport work vehicle A is transporting the conveyed item. In order to make it a transport state), by lowering the slide protrusion L10, the loading platform 1 rotates in the right direction while descending in the right diagonal direction, and is in a state before the side dump.

  The actuator L2 has a lower end of the cylinder portion L20 that is pivotally supported about an axis in the front-rear direction with respect to the frame A2, and an upper end of the piston rod L21 is supported with respect to the front side wall 10A and the rear side wall 10B of the loading platform 1. Thus, the upper and lower ends of the actuator L2 are rotated in response to the loading platform 1 ascending in the left diagonal direction and descending in the right diagonal direction. Has been.

  For example, various hydraulic cylinders, air cylinders, electric cylinders and the like can be used as the actuator L2.

  The wheels W1 and W2 are coaxially supported on axles W10 and W20 that are rotatably supported by a shaft support portion 2 disposed below the frame A2, and the forward and backward movements of the towed transport work vehicle A are performed. It is designed to rotate.

  As shown in FIGS. 3, 6, and 7, the shaft support portion 2 is rotatably supported by a support shaft 20 having a left and right axis disposed on a support A <b> 21 provided below the frame A <b> 2. During the traveling of the transport work vehicle A, the vertical movement of the transport work vehicle A when the wheels W1 and W2 get over the unevenness of the ground G is absorbed by the rotation of the shaft support portion 2, thereby The vertical movement of the transport work vehicle A can be suppressed, and the impact caused by the vertical movement of the transport work vehicle A can be reduced.

  The support shaft 20 is disposed between the axles W10 and W20, and the shaft support portion 2 is rotated at the position of the support shaft 20.

  The shaft support portion 2 may be moved up and down during the traveling of the transport work vehicle A via a suspension (not shown) using the hydraulic pressure and the expansion and contraction force of a spring (not shown). With this configuration, the unevenness of the ground may be absorbed to reduce the impact on the traveling work vehicle A during traveling.

  A hydraulic cylinder (hydraulic cylinder) 3 that extends and contracts following the rotation of the shaft support portion 2 is installed on the transport work vehicle A over the frame A2 and the shaft support portion 2.

  The hydraulic cylinder 3 is disposed only on the side of the shaft support 2 that supports the left wheels W1 and W2 (on the side of the shaft support 2 in the direction in which the loading platform 1 side dumps).

  The hydraulic cylinder 3 is extended and retracted by the lock device 4 while the transport work vehicle A is traveling, and the expansion and contraction is stopped during the operation of the loading platform 1.

  That is, when the transport work vehicle A is traveling, the lock device 4 holds the hydraulic cylinder 3 so as to be extendable and contracted, so that the rotation of the shaft support portion 2 is not obstructed while the transport work vehicle A is traveling. The shaft support 2 that suppresses vertical movement during traveling can be rotated normally.

  On the other hand, the locking device 4 stops the expansion and contraction of the hydraulic cylinder 3 during the operation of the loading platform 1, thereby stopping the rotation of the shaft supporting portion 2 during the operation of the loading platform 1 and maintaining the rotation stopped state of the shaft supporting portion 2. be able to.

  With this lock device 4, the hydraulic cylinder 3 can be switched between a telescopic state and a hydraulic cylinder 3 in a telescopic stop state, and the hydraulic cylinder 3 can be held in an telescopic state and an expansion / contraction stopped state.

  In the telescopic state of the hydraulic cylinder 3, while the transport work vehicle A is traveling, the shaft support 2 can be freely rotated according to the vertical movement of the wheels W <b> 1 and W <b> 2 overcoming the unevenness of the ground G. The vertical movement of A can be absorbed.

  When the loading platform 1 side dumps, the center of gravity of the transport work vehicle A is moved to the left side of the transport work vehicle A due to the load of the loading platform 1, and the load of the loading platform 1 due to the movement of the center of gravity is concentrated on the left wheels W1 and W2. As a result, the wheels W1 and W2 move up and down as the shaft support 2 rotates, and the transport work vehicle A tends to tilt.

  At this time, before the loading platform 1 is side dumped, the lock device 4 is switched in a direction in which the expansion and contraction of the hydraulic cylinder 3 stops, so that the load on the loading platform 1 due to the movement of the center of gravity of the transport work vehicle A is changed to the left wheel W1. , Even if it concentrates on W2, since the rotation of the shaft support part 2 is prevented by the expansion and contraction stop of the hydraulic cylinder 3, it is possible to prevent the transport work vehicle A from being inclined due to the vertical movement of the wheels W1 and W2. The rollover due to the inclination of the transport work vehicle A can be prevented.

  In addition, in order to reliably carry out the conveyed product in the loading platform 1, even if the load when the loading platform 1 is shaken up and down is continuously applied by the link mechanism L, the hydraulic pressure whose expansion and contraction is stopped by the locking device 4. Since the cylinder 3 prevents the shaft support 2 from rotating, it is possible to prevent the transport work vehicle A from tilting due to the vertical movement of the wheels W1 and W2, thereby preventing the rollover of the transport work vehicle A from being overturned. be able to.

  The center of gravity of the transport work vehicle A having the illustrated configuration is generally positioned forward, and accordingly, the load acting on the hitch A10 portion of the connecting portion A1 increases. Therefore, the inclination of the transport work vehicle A due to the vertical movement of the wheels W1 and W2 is the right front diagonal direction.

  Therefore, in the transport work vehicle A having the illustrated configuration, the shaft support position with respect to the frame of the cylinder portion 40A of the hydraulic cylinder 3 is set to the rear side with respect to the support shaft 20, and the shaft support portion of the piston rod 40B of the hydraulic cylinder 3 2 is set to the front side with the support shaft 20 as a boundary, and the axial direction of the hydraulic cylinder 3 is tilted forward, thereby efficiently receiving the load in the diagonally forward direction on the left side of the transport work vehicle A. be able to.

  That is, by the arrangement configuration of the hydraulic cylinder 3 described above that can efficiently receive the load in the left front diagonal direction of the transport work vehicle A, the left front tilt of the transport work vehicle A is inclined in the front diagonal direction. Can be prevented.

  Regarding the arrangement configuration of the hydraulic cylinder 3, the illustrated transport work vehicle A is supported so that the loading platform 1 is side dumped only on the left side, and therefore, if the hydraulic cylinder 3 is only on the left side, the side dump of the loading platform 1 is performed. It is possible to prevent the rotation of the shaft support portion 2 by receiving the load on the left side due to.

  In addition, in the case of carrying out a more reliable prevention of rollover and when the loading platform 1 is a transport work vehicle A that side dumps both left and right, the hydraulic cylinder 3 is attached to the shaft support portion 2 that supports the left and right wheels W1, W2. Each is provided (not shown).

  Next, the locking device 4 according to the present embodiment will be described with reference to FIGS. The locking device 4 includes a primary side pipe 4B piped from the reservoir tank 4A to the primary side port 40 of the cylinder part 40A, and a secondary side pipe piped from the reservoir tank 4A to the secondary side port 41 of the cylinder part 40A. 4C and the on-off valve 4D connected to the primary side pipe 4B.

  According to this locking device 4, in the open state of the on-off valve 4D, when the force due to the rotation of the shaft support portion 2 is transmitted to the piston rod 40B, the primary side pipe 4B and the secondary side pipe 4C of oil through the reservoir tank 4A. Therefore, the piston rod 40B can be projected and retracted with the rotation of the shaft support portion 2, and the piston rod 40B can be expanded and contracted by following the rotation of the shaft support portion 2 (unlocked state). .

  On the other hand, in the closed state of the on-off valve 4D, when the force to rotate the shaft support portion 2 is transmitted to the piston rod 40B, the oil in the primary side pipe 4B and the secondary side pipe 4C through the reservoir tank 4A Since the circulation is hindered by the on-off valve 4D, even if the force to rotate the shaft support portion 2 is transmitted to the piston rod 40B, the piston rod 40B is immovable by the pressure of the oil that has hindered the circulation ( Locked).

  That is, even if the force that the shaft support portion 2 tries to rotate acts on the piston rod 40B, the rotation of the shaft support portion 2 is prevented by the piston rod 40B that has been locked by the lock device 4 so that the expansion and contraction is locked. Thus, the vertical movement and the inclination of the transport work vehicle A during the side dump of the loading platform 1 can be prevented.

  As shown in FIGS. 9 and 10, the on-off valve 4 </ b> D is opened and closed according to the vertical movement of the loading platform 1.

  The opening / closing structure of the opening / closing valve 4D is such that the opening / closing valve 4D is provided on the frame A2 with the axis of the valve rod 40D parallel to the front-rear direction, and the lever 41D is rotated on the valve rod 40D integrally with the valve rod 40D. The urging portion 42D is bridged across the left side (side dump side) end portion 410D and the frame A2 with the valve rod 40D of the lever 41D as a boundary.

  The lever 41D rotates the valve rod 40D to operate opening / closing of the on-off valve 4D. The lever 41D shown in FIG. 9 is rotated by rotating the valve rod 40D in the direction of opening the on-off valve 4D. It is the state hold | maintained in the state which does not prevent expansion / contraction of.

  On the other hand, the position of the lever 41D shown in FIG. 10 is a state in which the valve rod 40D is rotated in the direction to close the on-off valve 4D and the expansion and contraction of the hydraulic cylinder 3 is prevented.

  As shown in FIG. 9, the lever 41 </ b> D that rotates the valve rod 40 </ b> D in the direction to open the on-off valve 4 </ b> D is a lever at the lower corner portion 10 </ b> D on the left side wall 10 </ b> C side of the loading platform 1 in the transportation state. The contact end 411D on the right side (loading platform 1 side) with the valve rod 40D of 41D as a boundary is held in a state of being pushed down to the frame A2 side.

  Since the contact end portion 411D is pushed down to the frame A2 side, the end portion 410D is positioned upward, and the biasing portion 42D applies a biasing force in a direction to pull the end portion 410D to the frame A2 side.

  On the other hand, as shown in FIG. 10, the lever 41D that rotates the valve rod 40D in the direction to close the on-off valve 4D has the lower corner portion 10D separated upward from the contact end portion 410D by the rising of the loading platform 1. The end portion 410D is pulled down to the frame A2 side by the pulling force of the biasing portion 42D, and the contact end portion 410D is held in a state of being lifted upward.

  The position where the contact end portion 410D is lifted upward is a position where the lower corner portion 10D contacts from above and can be pushed down to the frame A2 side during the return when the loading platform 1 returns to the transport state.

  The operation of switching the open / close valve 4D shown in FIG. 9 from the open state to the closed state shown in FIG. 10 is caused by the pulling force of the urging portion 42D generated when the loading platform 1 is lifted. The lever 41D is rotated in the closing direction while being lifted upward while being in contact with the lower corner portion 10D, and the on-off valve 4D is rotated by the rotation of the valve stem 40D in the closing direction accompanying the rotation of the lever 41D. Is a closing operation.

  In this switching operation, the lever 41D may be set so that the on-off valve 4D is fully closed when the lower corner portion 10D is separated from the contact end portion 411D, or the lever 41D is being rotated in the closing direction. In the state where the lower corner portion 10D is in contact with the contact end portion 411D, the lever 41D may be set so as to fully close the on-off valve 4D. The lever 41D that is rotated by force rotates the valve rod 40D to the fully closed state, whereby the open / close valve 4D can be switched from the fully open state to the fully closed state, and the open / close valve 4D is pulled by the pulling force of the urging portion 42D. It is possible to hold the position of the lever 41D that fully closes the lever 41D.

  On the other hand, the operation of switching from the closed state of the on-off valve 4D shown in FIG. 10 to the open state of the on-off valve 4D shown in FIG. By contacting the end portion 411D and pushing down the contact end portion 411D toward the frame A2, the lever 41D is rotated in the opening direction, and the opening / closing valve 4D of the valve rod 40D is opened in accordance with the rotation of the lever 41D. This is an operation of opening the on-off valve 4D by rotation.

  In this switching operation, the lever 41D is set so as to fully open the on-off valve 4D when the loading platform 1 returns to the transporting state, and the lever 41D that rotates when the loading platform 1 moves down is the valve rod 40D. The on-off valve 4D can be switched from the fully-closed state to the fully-open state by rotating it to the fully open state, and at the lower corner portion 10D of the loading platform 1 in the transported state, the on-off valve 4D is pressed by the contact end portion 411D. The position of the lever 41D that opens the 4D can be held.

  According to such an opening / closing structure of the opening / closing valve 4D, the opening / closing valve 4D can be opened by the operation of bringing the loading platform 1 into the transport state, and the opened state can be maintained. The on-off valve 4D can be closed and the closed state can be maintained.

  The urging portion 42D exemplified in the present embodiment uses a tension spring, whereby the lever 41D that closes the on-off valve 4D and the lever 41D that closes the on-off valve 4D with the pulling force generated by the expansion and contraction of the tension spring. The position of the biasing portion 42D is not limited to the tension spring, but the rotation of the lever 41D that closes the on-off valve 4D and the position of the lever 41D that closes the on-off valve 4D. As long as the urging force capable of holding is generated, it is sufficient.

  As another example of the opening / closing structure of the opening / closing valve 4D, an electromagnetic valve or an electric valve that is electrically opened / closed by a remote switch (not shown) operation is used. A structure that can be opened and closed by operating a switch in accordance with unloading can be exemplified. In this case, the switch may be arranged at a place where the driver can easily operate such as a driver's seat of the tow vehicle.

  According to the transport work vehicle A having the above configuration, the expansion and contraction of the hydraulic cylinder 3 is locked by the lock device 4 without using the outrigger, so that the rotation of the shaft support portion 2 is prevented, and the transport work vehicle A is moved up and down. And tilting can be prevented.

  That is, since the expansion and contraction of the hydraulic cylinder 3 that expands and contracts following the rotation of the shaft support portion 2 can be stopped by the lock device 4, the vertical movement of the transport work vehicle A by the side dump of the loading platform 1 without using the outrigger, and Tilt can be prevented.

  In addition, since the outrigger is unnecessary, there is no side protrusion of the transport work vehicle A by the outrigger, and another transport work vehicle 100 (FIGS. 11 to 13) or a container (see FIG. (Not shown) and the like can be secured, and the work for carrying out the conveyed product can be easily performed.

  Furthermore, since an outrigger that contacts the ground G is not required, even when the ground G is soft, it is possible to prevent the transport work vehicle A from being tilted at the time of side dumping of the loading platform 1 and during traveling after unloading work. It is possible to prevent damage to each part of the transport work vehicle A, and other parts of the transport work vehicle 100 and the container.

  Moreover, by unlocking the locking device 4, the shaft support portion 2 is in a freely rotatable state. As a result, the wheels W1 and W2 move up and down during the traveling of the transport work vehicle A to absorb the unevenness of the ground and are traveling. The impact on the transport work vehicle A can be reduced.

  In addition, since the on-off valve 4D is kept open in the transport state of the loading platform 1, the unlocking state of the locking device 4 can be reliably maintained during the traveling of the transport work vehicle A. In the 1 side dump state, since the on-off valve 4D is kept closed, the locked state of the lock device 4 can be reliably held during the carrying-out operation of the conveyed product.

  Hereinafter, a transport work vehicle A ′ according to a second embodiment of the present invention will be described with reference to FIGS. 11 to 13. In addition, description about the site | part which overlaps with 1st embodiment is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The edge portion 10C1 on the carry-out side of the loading platform 1 of the transport work vehicle A 'is provided with an extension plate 5 extending from the edge portion 10C1 in the carry-out direction of the load. Here, the unloading side edge 10C1 is an edge on the opening 10 side of the left side wall 10C, which is the unloading side wall of the loading platform 1, and is adjacent to the unloading work vehicle A ′. It is an edge part located in the side by which FIG. 11 is arrange | positioned.

  The extension plate 5 improves the certainty when transporting the transported object to the loading platform 101 of the other transport work vehicle 100, and has a length over the entire area of the edge 10C1, with respect to the edge 10C1. The shaft is supported so as to rotate in the left-right direction around the front-rear axis.

  Further, as shown in FIG. 13, the extension plate 5 is prevented from rotating to the left side from the position where the surface continues at the same angle as the angle of the vertical surface of the left side wall 10C of the cargo bed 1, and to the right side. Is supported so that

  Further, the extension plate 5 is given a biasing force to rotate leftward with respect to the rightward rotation of the extension plate 5 by a spring (biasing portion) 6 provided so as to extend between the extension plate 5 and the loading platform 1. As shown in FIGS. 11 and 13, when the loading platform 1 is side dumped, the extension plate 5 rotates to the right when it contacts the edge 102 of the loading platform 101 of another transport work vehicle 100. By doing so, the impact caused by the contact can be alleviated, whereby the extension plate 5 and the loading platform 101 can be prevented from being damaged or deformed.

  The extension plate 5 is biased so as to rotate to the left side with respect to the rotation to the right side. Therefore, when the extension plate 5 moves away from the edge 102 of the loading platform 101, the extension plate 5 rotates to the left side by the biasing force of the spring 6 and extends. The extension plate 5 can be held at a position where the surface of the plate 5 continues at the same angle as the angle of the vertical surface of the left side wall 10C of the loading platform 1, and as shown in FIG. In a state where it does not come into contact with the edge portion 102, it is possible to maintain a state where the extension plate 5 faces the inside of the loading platform 101.

  Further, the front and rear corners of the extension plate 5 are constituted by deformable plates (buffer portions) 50 made of a synthetic resin material such as a rubber material having a hardness that is less bent by its own weight.

  In the corner portion of the extension plate 5, the deformation plate 50 is a place where damage or deformation due to contact occurs most in the range of the extension plate 5. By using the deformation plate 50 in this place, damage or deformation due to contact occurs. Can be suppressed.

  Further, when the transport work vehicle A ′ and another transport work vehicle 100 are adjacent to each other, the front and rear angles of the transport work vehicles A ′ and 100 are very rare, even if one is horizontal. In many cases, the other side is tilted forward or rearward. Therefore, when the loading platform 1 is side dumped, the first contact portion becomes the corner portion of the extension plate 5.

  When the front and rear angles of the transport work vehicles A ′ and 100 are the same, the entire lengthwise direction of the extension plate 5 contacts the edge portion 102 of the loading platform 101 when the loading platform 1 is side dumped. Is distributed over the entire area of the extension plate 5, whereby deformation and breakage of the extension plate 5 including the corner portion and the edge portion 102 can be suppressed.

  However, when the front and rear angles of the transport work vehicles A ′ and 100 are not the same, the corner portion of the extension plate 5 first comes into contact with the edge portion 102 when the loading platform 1 is side dumped. It concentrates on the corner part of the extension board 5, and it becomes easy to produce the deformation | transformation and damage of the corner part of the extension board 5, and the edge part 102 which this corner part contacts.

  That is, by configuring the corner portion of the extension plate 5 with the deformable plate 50, the corner portion of the extension plate 5 is caused by the side dump of the loading platform 1 when the front and rear angles of the transport work vehicle A ′, 100 are not the same. When contacting the edge portion 102, the contact pressure is absorbed by the deformation of the deformation plate 50, thereby suppressing the deformation and breakage of the corner portion of the extension plate 5 and the edge portion 102 that the corner portion contacts. it can.

  In addition, the deformation | transformation board 50 is not restricted to the structure arrange | positioned in the corner part of the extension board 5 which was illustrated, It is good also as what comprises the whole region of the extension board 5. FIG.

  According to this transport work vehicle A ′, with the same effect as the transport work vehicle A of the first embodiment, the extension plate 5 applies the contact pressure to the edge portion 102, the rotation of the extension plate 5, and the deformation plate 50. Absorbing by deformation has an effect of suppressing deformation and breakage of the extension plate 5 and the edge portion 102 due to contact.

A: Transport work vehicle A ': Transport work vehicle A2: Frame L: Link mechanism W1: Wheels W2: Wheels W10: Axle W20: Axle 1: Loading platform 10: Opening 10C1: Edge 2: Shaft support 3: Hydraulic cylinder ( Cylinder, hydraulic cylinder)
4: Lock device 4A: Reservoir tank 4B: Primary side pipe 4C: Secondary side pipe 4D: Open / close valve 40: Primary side port 41: Secondary side port 5: Extension plate 50: Deformation plate (buffer part)
6: Spring (biasing part)

Claims (4)

A transport work vehicle capable of side dumping in which a loading platform is tilted in a direction orthogonal to the traveling direction of the transport work vehicle and a transported object loaded on the load platform is carried out, the transport work vehicle including a link mechanism A frame that supports the loading platform so as to be capable of side dumping via a shaft, a shaft support provided on the frame, and a shaft support that is rotatable about an axis orthogonal to the traveling direction of the transport vehicle. a pair of axles before and after the, a wheel which is pivotally supported coaxially with the axle, is bridged across said shaft support and said frame, and a hydraulic cylinder to expand and contract to follow the vertical movement of the wheel, of the loading platform A locking device that locks the hydraulic cylinder so as not to extend and contract in a side dump state, and the shaft support portion has an axis parallel to the axle and is disposed between a pair of the axles. Axis The hydraulic cylinder is rotatably supported on the center, and the hydraulic cylinder is disposed at least on the axial support portion side on the side where the cargo bed side dumps, and the locking device causes liquid to flow with respect to the hydraulic cylinder. And an open / close valve that enables expansion and contraction of the hydraulic cylinder and disables expansion and contraction of the hydraulic cylinder by stopping the flow of liquid with respect to the hydraulic cylinder. The lever that is pivotally supported by the valve stem rotates so that the valve stem of the on-off valve rotates together with the valve stem in conjunction with the switching operation between the carrying state and the side dump state of the loading platform. Thus, the transport vehicle is configured to switch between a liquid flowable state and a liquid flow stop state with respect to the hydraulic cylinder . The liquid end of the pressure cylinder, according to claim 1 carrying work vehicle, wherein the is arranged in front of the said support shaft is coupled to the shaft supporting portion. An edge on the carry-out side of the opening for carrying in / out of the conveyed product is provided with an extension plate extending in the carry-out direction of the conveyed product from the edge, and the extension plate is The bearing is rotatably supported around an axis parallel to the traveling direction of the transport vehicle, and is rotated toward the opening by an urging portion arranged so as to span the extension plate and the opening. The transport work vehicle according to claim 1 , wherein the transport work vehicle is biased so as to rotate to the opposite side of the vehicle. The transport work vehicle according to claim 3, wherein a buffer portion that alleviates a contact impact is arranged on a part or all of the tip of the extension plate facing the shaft support side of the extension plate .

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