JP2002036937A - Pallet carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure by reducing the number of parts of a pallet carrier which holds, carries and dumps the pallets. SOLUTION: There is provided at rear body 14 of the carrier a hold frame 19 which is constituted in horizontal posture with up and down freedom by lift cylinder devices 21, 22 installed respectively at the fore and the rear of the rear body, and the rear end of the hold frame 19 is connected to and held by the tip of piston rod 22a at the rear cylinder device 22 through a hinge pin 30 connected to the tip part of the above piston rod 22a, and the hold frame 19 is constituted to be freely rotative and movable upward and downward with centering the hinge pin 30 and there is provided a dump cylinder device 36 for making the hold frame 19 rotate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet transport vehicle used for transporting a pallet loaded with earth and sand and dumping the pallet at a destination to discharge the earth and sand.

[0002]

2. Description of the Related Art Conventionally, as this kind of transporting vehicle, there is one that transports a vessel (pallet) as disclosed in, for example, Japanese Patent Application Laid-Open No. 2-193732. That is, a sub-frame (support member) that supports the vessel is provided on the rear frame. The sub-frame is configured to be able to move up and down in a horizontal posture by a front lift cylinder and a rear lift cylinder provided on a rear frame. A rear part of the lift frame is connected to a rear end of the sub-frame via a hinge pin in a left-right direction. The front portion of the lift frame is connected to the front end of the piston rod of the rear lift cylinder via a connecting pin in the left-right direction.

Further, an upper pin hole and a lower pin hole are formed at the rear of the lift frame, and a lock pin which is retracted by a lock cylinder provided in the rear frame is configured to be freely inserted into and removed from the pin hole. Have been.

Further, the sub-frame is configured to be rotatable up and down around the hinge pin.
A dump cylinder for rotating the sub frame is provided on the rear frame.

According to this, when transporting a vessel,
The sub-frame is raised in a horizontal position by extending the front lift cylinder and the rear lift cylinder. As a result, the vessel is supported and lifted by the subframe. At this time, the lift frame moves up via the connecting pin and the hinge pin as the sub frame moves up. Thereafter, the lift frame is fixed to the rear frame by inserting the lock pin into the lower pin hole.

[0006] When the vessel is transported in this way, and the vessel is dumped to discharge the earth and sand in the vessel,
By extending the dump cylinder, the sub-frame pivots upward around the hinge pin, so that the vessel also pivots upward with the sub-frame to assume an inclined posture, and the sediment in the vessel is discharged.

[0007]

However, in the above-mentioned conventional type, as shown in FIG. 13, the hinge pin 71 moves up and down together with the sub-frame 72, and the rear lift cylinder 73 is provided forward of the hinge pin 71. It is necessary to provide a lift frame 74 that can move up and down together with the sub-frame 72 between the hinge pin 71 and the distal end of the piston rod 73a of the rear lift cylinder 73. For this reason, there has been a problem that the structure becomes complicated.

[0008] It is an object of the present invention to provide a pallet transport vehicle having a simplified structure by reducing the number of parts.

[0009]

According to a first aspect of the present invention, there is provided a pallet transport vehicle in which a support member for supporting a pallet is provided at a rear portion of a vehicle body. A plurality of front and rear lift cylinder devices provided on the vehicle body are configured to be able to move up and down in a horizontal posture, and the rear end of the support member is connected to a rear end of a piston rod of a rearmost lift cylinder device via a left-right hinge pin. The hinge pin is connected to and supported by a distal end, the hinge pin is connected to a distal end of a piston rod of a rearmost lift cylinder device, and the support member is configured to be rotatable up and down around the hinge pin. A dump cylinder device for rotating a member is provided.

According to this, when transporting a pallet,
The piston rod of each lift cylinder device projects, and the support member rises in a horizontal posture. Thereby, the pallet is lifted while being supported by the support member. At this time, the piston rod of the last lift cylinder device protrudes,
The hinge pin rises with the support member.

When the pallet is transported in this manner and the pallet is dumped and the contents stored in the pallet are discharged, the piston rod of the dump cylinder device protrudes, whereby the support member rotates upward around the hinge pin. As a result, the pallet is rotated upward together with the support member to assume an inclined posture, and the stored items in the pallet are discharged.

As described above, since the hinge pin is connected to the distal end of the piston rod of the rearmost lift cylinder device, the vertical load applied to the hinge pin is directly supported by the rearmost lift cylinder device, and the conventional lift cylinder device has the conventional structure. Such a lift frame becomes unnecessary.

According to the second aspect of the present invention, an arm for receiving a load in the front-rear direction is provided between the vehicle body and the hinge pin, and the arm is long in the front-rear direction, and rotates up and down as the support member moves up and down. It is configured to be movable.

According to this, when the pallet is lifted by raising the support member and the pallet is transported by moving the vehicle body, the load in the front-rear direction acting on the support member is received by the arm. Also, when the pallet is dumped, a load in the front-rear direction acts on the support member, and the load in the front-rear direction is also received by the arm. Thus, it is possible to prevent the piston rod of the last lift cylinder device from being damaged by the load in the front-rear direction.

According to a third aspect of the present invention, there is provided a fixing device for fixing the support member raised to the raised position in a horizontal posture. According to this, when the piston rod of each lift cylinder device protrudes and the support member rises to the raised position in the horizontal posture and lifts the pallet, the support member is fixed by the fixing device. Accordingly, if the working fluid pressure in the lift cylinder device is inadvertently reduced and the piston rod attempts to retreat, the support member is fixed at the raised position, so that the support member is lowered from the raised position. Never. Therefore, even if the piston rod attempts to retreat carelessly while lifting and transporting the pallet, the pallet is prevented from falling to the ground, and the pallet can be transported continuously without any trouble. .

[0016]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG. As shown in FIG.
Is a transport vehicle for transporting the pallets 2.

The pallet 2 has a box-shaped main body 3 having an open upper surface and a rear surface, a plurality of legs 4 hanging from both sides of the main body 3, and left and right sides provided at lower ends of the legs 4. It is composed of a pair of ground frames 5. The main body 3 is supported at a fixed height from the ground by the leg members 4 and the grounding frame 5.

The transport vehicle 1 is configured as follows. That is, as shown in FIG. 1, the vehicle body 10 includes a front vehicle body 12 having a front wheel 11 and a rear vehicle body 14 having a rear wheel 13. A driver's cab 15 is provided in the front body 12. The front body 12 and the rear body 1
4 is a connecting device 17 comprising a pair of upper and lower connecting pins 16
Are connected so as to be relatively swivelable about the longitudinal axis 18. Also, between the front body 12 and the rear body 14,
A cylinder device (steering cylinder device: not shown) for changing the direction of turning the front vehicle body 12 in the left-right direction with respect to the rear vehicle body 14 is provided.

As shown in FIG. 1 and FIG.
4, a supporting frame 19 for supporting the pallet 2
(An example of a support member) is provided. The support frame 19 is configured to be vertically movable in a horizontal posture by a pair of left and right front lift cylinder devices 21 and a pair of left and right rear lift cylinder devices 22. Each of the lift cylinder devices 21 and 22 is attached to the rear vehicle body 14 in a vertical direction via a lower horizontal pin 23 in the left-right direction, and is swingable back and forth about the horizontal pin 23. 3 and 5
As shown in (2), when the piston rods 21a and 22a of the lift cylinder devices 21 and 22 are retracted, the support frame 19 is lowered to the lowering position A and is supported by the rear vehicle body 14. As shown in FIGS. 4 and 6, when the piston rods 21a and 22a protrude,
Rises to the ascending position B and is lifted above the rear vehicle body 14.

As shown in FIGS. 2 to 4, a horizontal member 25 in the left and right direction is provided between the distal ends of the piston rods 21a of the front lift cylinder devices 21 via a horizontal upper pin 24 in the left and right direction. Is provided. The cross member 25 supports the front part of the support frame 19 from below, and moves the front part of the support frame 19 up and down by the reciprocation of the piston rods 21a of both front lift cylinder devices 21.

The upper horizontal pin 24 and the rear vehicle body 14
A pair of left and right front arms 26 receiving a load in the front-rear direction is provided between the front arm 26 and the front arm 26. That is, both front arms 26
The rear end is rotatably connected to the upper horizontal pin 24, and the front end is rotatably connected to the rear vehicle body 14 via a front horizontal pin 27 in the left-right direction. As shown in FIG. 3, when the support frame 19 is lowered to the lowering position A, the front arm 26 rotates downward and lays down in the front-rear direction.
As shown in (2), when the support frame 19 has been raised to the raised position B, the front arm 26 is rotated upward and the rear portion is in an inclined posture in which it is raised.

As shown in FIGS. 2, 5 to 7, the rear end of the support frame 19 is connected to the front ends of the piston rods 22a of the left and right rear lift cylinder devices 22 through a pair of left and right hinge pins 30. It is connected and supported. That is, at the rear end of the support frame 19, two sets of left and right mounting plates 31, 32, and 33 facing each other in the left and right direction are provided.
1, 32, and 33 are inserted in the left-right direction. The distal ends of the piston rods 22a of the rear lift cylinder devices 22 are inserted from below into between the inner mounting plate 31 and the intermediate mounting plate 32, and the hinge pins 30 are connected to the piston rods 22a.
Is connected to the distal end of the piston rod 22a. The support frame 19 includes a hinge pin 30
Is configured to be rotatable up and down around the center.

The hinge pin 30 and the rear body 14
A pair of left and right rear arms 34 receiving a load in the front-rear direction is provided between the left and right arms. That is, both rear arms 34
The rear end is inserted between the middle mounting plate 32 and the outer mounting plate 33 and is rotatably connected to the hinge pin 30. The front ends of the rear arms 34 are rotatably connected to the rear vehicle body 14 via rear horizontal pins 35 in the left-right direction. When the support frame 19 is lowered to the lowering position A as shown in FIG. 5, the rear arm 34 turns downward and lays down in the front-rear direction, and as shown in FIG. When the rear arm 34 has risen to the position B, the rear arm 34 is pivoted upward and the rear part is in the inclined posture in which the rear part has risen.

As shown in FIGS. 1 and 2, the support frame 19 is provided with a pair of left and right telescopic dump cylinder devices 36 for rotating the support frame 19. The two dump cylinder devices 36 are rotatably mounted on the support frame 19 via left and right mounting pins 37, respectively. The distal ends of the piston rods 36 a of the both dump cylinder devices 36 are connected to the left and right connecting pins 3.
8, and is rotatably connected to the rear vehicle body 14.

Further, the transporting vehicle 1 is provided with a rear fixing device 40 and a front fixing device 41 for fixing the support frame 19 which has been raised to the raised position B (see the solid line in FIG. 1). That is, as shown in FIGS. 5, 6, and 8, the rear fixing device 40 includes a rear fixing plate 42 hung from the left and right rear arms 34 and a pair of right and left rear fixing pins 43 provided on the rear body 14. And a rear fixing cylinder device 45 for inserting and removing the rear fixing pins 43 into and from rear pin holes 44 formed in the lower portions of the left and right rear fixing plates 42.

The two rear fixing pins 43 are inserted into a pair of left and right cylindrical rear boss members 46 provided on the rear vehicle body 14 and held so as to be able to move back and forth in the left and right directions. Also,
The rear fixing cylinder device 45 includes two rear fixing pins 43.
One of the right and left rear fixing pins 4 is provided between the distal ends of the piston rods 45a of the rear fixing cylinder device 45.
3 is connected to the main body 45 of the rear fixing cylinder device 45.
The other right and left rear fixing pins 43 are connected to the other end of b. Further, as shown in FIG.
6 is provided with a stopper 47 for preventing the rear fixing pin 43 from falling off.

As shown in FIGS. 2 to 4, the front fixing device 41 includes a pair of left and right front fixing plates 49 suspended from the cross member 25 and a pair of left and right front fixing plates 49 provided on the rear body 14. A front fixing pin 50 and a front fixing cylinder device 52 for inserting and removing the front fixing pins 50 into and from front pin holes 51 formed in the lower portions of the front fixing plates 49. Have been.

Like the rear fixing device 40, as shown in FIG. 9, the front fixing pins 50 are inserted into a pair of left and right cylindrical front boss members 53 provided on the rear vehicle body 14. It is held so that it can move back and forth in the left and right directions. The front fixing cylinder device 52 is provided between both front fixing pins 50, and one of the left and right front fixing pins 50 is attached to the tip of the piston rod 52a of the front fixing cylinder device 52.
Are connected to the main body 52b of the front fixing cylinder device 52.
The other left and right front fixing pins 50 are connected to each other. The left and right front boss members 53 are provided with stoppers 47 for preventing the front fixing pins 50 from falling off, similarly to the rear fixing device 40.

The support frame 19 is provided with a lock device (not shown) for fixing the supported pallet 2 to the support frame 19. Hereinafter, the operation of the above configuration will be described.

When the pallet 2 is transported by the transporting vehicle 1 after the storage items such as earth and sand are loaded into the pallet 2, the support frame 19 is lowered to the lowering position A as shown in FIG. Then, the transport vehicle 1 is moved backward, and the rear vehicle body 14 is inserted between the left and right leg members 4 of the pallet 2. Thus, the support frame 19 is located below the main body 3 of the pallet 2.

Thereafter, as shown by the solid line in FIG. 1, the piston rods 21a and 22a of the front and rear lift cylinder devices 21 and 22 are protruded so that the support frame 19 is moved from the lowered position A to the raised position in a horizontal posture. It rises to B. Thereby, as shown in FIG.
Is supported by the support frame 19 and lifted.

At this time, the pallet 2 is fixed to the support frame 19 by a lock device (not shown). As shown by the solid line in FIG.
The projection of the piston rod 22a raises both hinge pins 30 together with the support frame 19. Further, the front arm 26 pivots upward from the sideways posture about the front lateral pin 27 to an inclined posture, and the rear arm 34 pivots upward from the sideways posture around the rear lateral pin 35. To the inclined posture.

As shown in FIG. 6, with the rotation of the rear arm 34, the rear fixing plate 42 is raised, and the rear pin hole 44 matches the position of the rear fixing pin 43. Then, as shown in FIGS. 8 and 9A, by projecting the piston rod 45a of the rear fixing cylinder device 45, the rear fixing pins 43 protrude and are inserted into the rear pin holes 44. Thereby, the support frame 19
Is fixed to the raised position B by the rear fixing device 40.

Further, as shown in FIG. 4, when the support frame 19 is raised to the raised position B,
The left and right front fixing plates 49 also rise, and the front pin holes 51 match the positions of the front fixing pins 50. Then, FIG.
As shown by, by projecting the piston rod 52a of the front fixing cylinder device 52, both front fixing pins 50 protrude and are inserted into both front pin holes 51. Thus, the front portion of the support frame 19 is fixed at the raised position B by the front fixing device 41.

As described above, since the support frame 19 can be fixed at the ascending position B by the front and rear fixing devices 40 and 41, each of the lift cylinder devices 21 and
2. The hydraulic pressure in the interior of the cylinder 2 decreases and the front lift cylinder device 21
Piston rod 21a and rear lift cylinder device 22
When the piston rod 22a of the second frame is about to retreat, the support frame 19 is fixed at the rising position B, and does not lower from the rising position B. Therefore, the pallet 2 is lifted, and the transport vehicle 1 is caused to travel, so that the pallet 2
When the piston rod 21 is inadvertently
Even if a and 22a try to retreat, the pallet 2 is prevented from falling to the ground, and the pallet 2 can be transported continuously without any trouble.

When the transport vehicle 1 is traveling and the pallet 2 is transported, a load in the front-rear direction is generated on the support frame 19 by accelerating or decelerating the transport vehicle 1. Such a load in the front-rear direction is received by the front arm 26 and the rear arm 34. As a result, the piston rods 21a, 21a of the lift cylinder devices 21, 22
2a can be prevented from being damaged by the load in the front-rear direction.

After transporting the pallet 2 to the destination, FIG.
As shown in FIG. 2, when the pallet 2 is dumped and the storage items (such as earth and sand) in the pallet 2 are discharged, the support rod 19 is moved around the hinge pin 30 by projecting the piston rod 36 a of the dump cylinder device 36. The pallet 2 rotates together with the support frame 19 to rotate upward.
The pallet 2 is also turned to the inclined position, and the stored items are discharged from the rear end of the pallet 2. At this time, the support frame 19 is
Away from above.

As described above, since the hinge pin 30 is connected to the distal end of the piston rod 22a of the rear lift cylinder device 22, the vertical load applied to the hinge pin 30 is directly supported by the left and right rear lift cylinder devices 22. This eliminates the need for a conventional lift frame. Thereby, the number of parts is reduced and the structure is simplified.

When the pallet 2 is dumped as described above, a load in the front-rear direction acts on the support frame 19, and the load in the front-rear direction is received by the rear arm 34. Thereby, the rear lift cylinder device 22
Can be prevented from being damaged by the load in the front-rear direction.

After the dumping of the pallet 2 is completed, the support frame 19 is rotated downward about the hinge pin 30 by retracting the piston rod 36a of the dump cylinder device 36, as shown in FIG. The empty pallet 2 rotates together with the support frame 19 and returns from the inclined posture to the horizontal posture. As shown in FIG. 4, the support frame 19 has its front portion supported on the horizontal member 25 and moves to the ascending position B. Return.

Then, as shown in FIG. 9B, when the piston rod 45a of the rear fixing cylinder device 45 is retracted, the rear fixing pins 43 are retracted and removed from the rear pin holes 44. Is pulled out. Thereby, the fixing of the rear part of the support frame 19 is released. Similarly, by retracting the piston rod 52a of the front fixing cylinder device 52, the front fixing pins 50 are retracted and removed from the front pin holes 51. Thereby, the support frame 19
The front part is released. Further, the fixing of the pallet 2 to the support frame 19 by the lock device (not shown) is released, and the pallet 2 is separated from the support frame 19.

Thereafter, as shown in FIG. 3 and FIG. 5, the piston rods 21a and 22a of the front and rear lift cylinder devices 21 and 22 are retracted to support the support rods as shown by phantom lines in FIG. The frame 19 is lowered from the raised position B to the lowered position A in a horizontal posture. Thereby, both grounding frames 5 of the pallet 2 are grounded, the empty pallet 2 is lowered to the ground, and the support frame 19 is separated below the main body 3 of the pallet 2. Thereafter, as shown in FIG. 10, the transport vehicle 1 is advanced, and the rear vehicle body 14 is disengaged forward from below the main body 3 of the pallet 2 and between the left and right leg members 4.
Thereby, the empty pallet 2 is left on the ground.

When the support frame 19 is raised and lowered between the lowered position A and the raised position B as described above, the piston rod 36a of the dump cylinder device 36 is moved in accordance with the vertical movement of the support frame 19. Therefore, they are switched to leave freely.

As shown in FIG. 9 (b), when the piston rod 45a of the rear fixing cylinder device 45 is retracted to remove the rear fixing pins 43 from the rear pin holes 44, the left and right One of the rear fixing pins 43 is detached from one of the rear pin holes 44 to form one of the rear boss members 4.
6, it is locked to one stopper 47, and then the other rear fixing pin 43 is pulled out from the other rear pin hole 44.
As a result, the left and right rear fixing pins 43 can be inserted into and removed from the rear pin holes 44 with one rear fixing cylinder device 45.

The same procedure is applied to the case where the piston rod 52a of the front fixing cylinder device 52 is retracted and the front fixing pins 50 are removed from the front pin holes 51. The left and right front fixing pins 50 can be inserted into and removed from both front pin holes 51 with one front fixing cylinder device 52.

In the above embodiment, as shown in FIG.
A dump cylinder device 36 is provided on the support frame 19, and the tip of the piston rod 36a is connected to the rear body 14, but the dump cylinder device 36 is provided on the rear body 14,
The tip of the piston rod 36a may be connected to the support frame 19. Further, as shown in FIG. 2, the number of dump cylinder devices 36 is not limited to two on the left and right, and
One or three or more units may be provided.

In the above embodiment, as shown in FIG.
Although the vehicle body 10 is divided into a front vehicle body 12 and a rear vehicle body 14, the vehicle body 10 may be integrally formed without being divided. In the above embodiment, as shown in FIG. 1, the lift cylinder devices 21 and 22 are provided at two places in front and rear of the rear body 14, but may be provided at three or more places. Further, as shown in FIG. 2, each of the lift cylinder devices 21 and 22 is provided on two right and left sides, but may be provided on one or three or more units.

[0048]

As described above, according to the first aspect of the present invention, since the hinge pin is connected to the distal end of the piston rod of the rearmost lift cylinder device, the vertical load applied to the hinge pin is reduced by the rearmost lift. It is directly supported by the cylinder device, eliminating the need for a conventional lift frame. Thereby, the number of parts is reduced and the structure is simplified.

According to the second aspect of the present invention, it is possible to prevent the piston rod of the last lift cylinder device from being damaged by the load in the front-rear direction. Further, according to the third aspect of the invention, when the pallet is lifted and transported, even if the piston rod of the lift cylinder device attempts to retreat carelessly, the pallet is prevented from falling to the ground, Pallets can be transported continuously without any trouble.

[Brief description of the drawings]

FIG. 1 is a side view of a transport vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view of a rear vehicle body of the transport vehicle.

FIG. 3 is a side view of the front lift cylinder device and the front fixing device of the transporting vehicle, showing a state where a support frame is lowered to a lowered position.

FIG. 4 is a side view of the front lift cylinder device and the front fixing device of the transporting vehicle, showing a state in which a support frame is raised to a raised position.

FIG. 5 is a side view of the rear lift cylinder device and the rear fixing device of the transporting vehicle, showing a state where the support frame is lowered to a lowered position.

FIG. 6 is a side view of the rear lift cylinder device and the rear fixing device of the transporting vehicle, showing a state in which a support frame is raised to a raised position.

FIG. 7 is a view of a rear end portion of a rear vehicle body of the transport vehicle.

FIG. 8 is a rear view of the rear fixing device of the transporting vehicle.

9A and 9B are diagrams illustrating the operation of the rear fixing device and the front fixing device of the transport vehicle, wherein FIG. 9A illustrates a fixed state, and FIG. 9B illustrates a released state.

FIG. 10 is a side view for explaining a procedure for transporting the pallet using the transport vehicle, showing a state where the transport vehicle is positioned in front of the pallet.

FIG. 11 is a side view when the pallet is supported using the transport vehicle.

FIG. 12 is a side view when the pallet supported by using the transport vehicle is dumped.

FIG. 13 is a side view of a conventional transport vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transport vehicle 2 Pallet 10 Body 19 Support frame (support member) 21 Front lift cylinder device 22 Rear lift cylinder device 22a Piston rod 30 Hinge pin 34 Rear arm 36 Dump cylinder device 40, 41 Fixing device B Ascending position

Claims (3)

[Claims] 1. A pallet transport vehicle provided with a support member for supporting a pallet at a rear portion of a vehicle body, wherein the support member is raised and lowered in a horizontal posture by a plurality of front and rear lift cylinder devices provided on the vehicle body. A rear end of the support member is freely connected to and supported by a distal end of a piston rod of a rearmost lift cylinder device via a horizontal hinge pin, and the hinge pin is a rearmost lift cylinder device. The support member is connected to the distal end of the piston rod, the support member is configured to be rotatable up and down around the hinge pin, and a dump cylinder device for rotating the support member is provided. Pallet transport vehicle. An arm for receiving a load in the front-rear direction is provided between the vehicle body and the hinge pin, the arm is long in the front-rear direction, and is configured to be rotatable up and down as the support member moves up and down. The pallet transport vehicle according to claim 1, wherein 3. The pallet transport vehicle according to claim 1, further comprising a fixing device that fixes the support member that has been raised to a raised position in a horizontal posture.