JPH10129329A - Carriage vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carriage vehicle to perform elevation of a load-carrying platform in a horizontal attitude through simple structure and support the load of a cargo supported by the load-carrying platform at the vehicle body side even when the operation timings of a plurality of cylinder device for elevation are not accurately synchronized with each other. SOLUTION: In a carriage vehicle 1 having a load-carrying platform 3 to support a cargo placed thereon, the load-carrying platform 3 is elevatably arranged at a vehicle body 10 in a state to hold a horizontal attitude through a plurality of parallel links 23 vertically turnable in a perpendicular surface, and a vehicle body 10 is provided with an individually turned cylinder device 24 for elevation. When the load-carrying platform 3 is raised and reaches a cargo support position P1 to support a cargo, support members 26 and 27 to support the load-carrying platform 3 on the vehicle body 10 side are arranged at the front end part of the vehicle body 10 and the rear end part, respectively, of the load-carrying platform 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport vehicle having a carrier for supporting a load such as a steel material placed thereon, and capable of changing the height of the carrier.

[0002]

2. Description of the Related Art Conventionally, as this type of transport vehicle, there is, for example, Japanese Utility Model Laid-Open Publication No. Sho 59-113232. That is, the tractor and the trailer towed by the tractor are connected via a connecting member, and a plurality of traveling wheels of the trailer are respectively attached to the trailer frame via lift arms that can be opened and closed in the vertical direction. . Each lift arm is provided with a hydraulically driven lift cylinder device that opens and closes the lift arm.
A loading platform is provided on the upper part of the trailer frame. Further, between the connecting member and the trailer frame, there is provided a double-acting cylinder device which is vertically expandable and contractible.

According to this, after a trailer is positioned below a load placed on a pit, each lift cylinder device and a double-acting cylinder device are operated to raise a trailer frame. As a result, the load is supported by the loading platform that rises with the trailer frame and lifted from the pit. Thereafter, the load is conveyed from the pit while being supported by the trailer bed by running the tractor and towing the trailer.

[0004]

However, in the above-mentioned conventional type, when the trailer frame is lifted to lift the load from above the pit or when the trailer frame is lowered to lower the load onto the pit, the loading platform is always in a horizontal posture. In order to move up and down, it is necessary to precisely synchronize the operation timing of each lift cylinder device and the double-acting cylinder device. In this way, the operation timing of each lift cylinder device and the double-acting cylinder device must be accurately synchronized. Tuning was difficult and required a complex tuning mechanism. In addition, since the load of the load supported by the carrier is received by each lift cylinder device, an excessive load is applied to each lift cylinder device due to an impact during traveling or the like, and the durability of each lift cylinder device is reduced or the lift cylinder device is lifted. There is a problem that oil leaks from the device.

Therefore, the present invention according to claim 1 of the present invention does not require a complicated tuning mechanism, allows the platform to be raised and lowered in a horizontal posture with a simple structure, and reduces the load of the load on the platform. It is an object of the present invention to provide a transport vehicle that can be supported on the vehicle body side.

[0006]

According to one aspect of the present invention, there is provided a transport vehicle having a carrier for supporting a load placed thereon. The loading platform is provided on the vehicle body via a plurality of parallel links rotatable in the vertical direction in a vertical plane, while being held in a horizontal position, and is vertically movable on the vehicle body. At least one parallel link is provided on the vehicle body. Is provided, a support member interposed between the loading platform and the vehicle body to support the loading platform on the vehicle body side when the loading platform rises and reaches the load supporting position for supporting the load. It is characterized by being provided.

[0007] According to this, when at least one parallel link is rotated by the driving device, all the parallel links are rotated synchronously in the same direction, so that the loading platform moves up and down in a horizontal posture. As described above, by using a plurality of parallel links, the bed can always be moved up and down in a horizontal posture with a simple structure without requiring a complicated tuning mechanism.

In addition, when the at least one parallel link is rotated upward by the driving device to raise the carrier to the supporting position, the supporting member is interposed between the carrier and the vehicle body, and the carrier is moved to the vehicle body. Since the load is supported on the side, the load of the load on the carrier is supported on the vehicle body side via the support member, and is not applied to the parallel link or the driving device.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 7, reference numeral 1 denotes a transport vehicle for transporting a load 2 such as a steel material or a wire rod.
Is composed of a trailer 4 provided with a carrier 3 for supporting the load 2 placed thereon, and a towing vehicle 5 for towing the trailer 4. As shown in FIGS. 1 and 2, the towing vehicle 5 includes:
A driver's cab 6 and a pair of left and right drive wheels 8 driven to rotate by an engine 7 are provided.

The vehicle body 10 of the trailer 4 has a pair of left and right main frames 11a, 11b extending in the front-rear direction.
End frames 12 and 13 connected between the front and rear ends of both main frames 11a and 11b;
It comprises a plurality of connecting frames 14 connected between the intermediate portions 1a and 11b. The vehicle body 10 of the trailer 4 is provided with a plurality of free-running traveling wheels 15.

A rear portion of the towing vehicle 5 and a front portion of the vehicle body 10 of the trailer 4 are connected via a kingpin 16 so as to be rotatable in the left-right direction about a vertical axis 17. Between the rear of the towing vehicle 5 and the front of the vehicle body 10 of the trailer 4, a steering cylinder device 18 for turning the direction of the towing vehicle 5 with respect to the trailer 4 in the left and right direction is distributed to the left and right sides of the king pin 16. It is provided.

The loading platform 3 includes a pair of left and right side frames 20 extending in the front-rear direction and a plurality of front and rear connection frames 21 connected between the two side frames 20. In addition, as shown in FIG. 2, the width W1 of the loading platform 3 is formed to be wider than the width W2 of the vehicle body 10 of the trailer 4. The loading platform 3 is provided on the vehicle body 10 via a parallel link mechanism 22 that is rotatable in a vertical plane in a vertical plane and that can move up and down while maintaining a horizontal posture.

As shown in FIGS. 2 and 3, the parallel link mechanism 22 is composed of four parallel links 23. Each of the parallel links 23 is located outside the main frame 11a on one of the left and right sides of the vehicle body 10. The front and rear portions of the side surface and the front and rear portions of the outer side surface of the other main frame 11b are attached in parallel to each other. The free end of each parallel link 23 is connected to the front connection frame 21 and the rear connection frame 21 of the carrier 3.

A hydraulically driven lifting / lowering cylinder device for individually rotating the parallel links 23 in the vertical direction at the front and rear portions of the one main frame 11a and the front and rear portions of the other main frame 11b, respectively. 24 (an example of a driving device) are provided. Each lifting / lowering cylinder device 24
Of the piston rod 25 is connected to the free end of each parallel link 23.

Both main frames 11 of the vehicle body 10
A front support member 26 is provided between the front portions of the upper surfaces a and 11b, and a rear support member 27 is provided between the lower rear ends of both side frames 20 of the carrier 3. The front support member 26 and the rear support member 27 are positioned at the highest point as shown by the imaginary lines in FIG. At the load support position P1 which has slightly lowered after passing through the vehicle body 1
It is supported on the 0 side. That is, the front support member 26 supports the front of the carrier 3 when the carrier 3 reaches the load support position P1. Also, the rear support member 27
When the carrier 3 reaches the load support position P1, the carrier is placed on the rear portion of the vehicle body 10 and is supported.

As shown by the solid line in FIG.
The carrier 3 descending to 2 is connected to the main frame 11a, 11b by the connection frame 21.
It is supported by the vehicle body 10.

When conveying a load 2 such as a high-temperature steel material or a wire material immediately after being formed at an ironworks, a pallet 29 is used as shown in FIG. Pallet 2 above
9 has a hollow portion 30 whose front surface is formed in a gate shape and into which the trailer 4 can be inserted and removed from the front and rear directions. On the upper surface of the pallet 29, a gate-shaped holding frame 31 for preventing the loaded load 2 from collapsing to the left and right sides is detachably provided. Further, as shown in FIG.
Is provided at the front end thereof with a stopper body 32 which engages with the front surface of the carrier 3 to prevent the pallet 29 on the carrier 3 from shifting backward.

The operation of the above configuration will be described below.
When the load 2 is transported by the transport vehicle 1, the load 2 is loaded on the pallet 29 using a dedicated crane or the like, and the holding frame 31 is mounted on the pallet 29 to prevent the load 2 from collapsing to the left and right sides. I do.

Then, the transport vehicle 1 is moved backward, and the trailer 4 is inserted into the hollow portion 30 of the pallet 29 as shown in FIG. Thereafter, as shown by the phantom line in FIG. 3, by extending the piston rod 25 of each of the lifting and lowering cylinder devices 24, each of the parallel links 23 rotates synchronously upward, and the carrier 3 remains in the horizontal posture. It rises from the lower limit position P2 to the load support position P1. Thereby, as shown in FIGS. 6 and 7, the load 2 is supported on the loading platform 3 via the pallet 29.

As shown in the imaginary line of FIG. 3 and FIG. 7, when the carrier 3 reaches the cargo support position P1, the front support member 26 supports the front of the carrier 3, and the rear support member 27 supports the trailer. 4 is mounted and supported on the rear portion of the vehicle body 10. Thereby, the load of the load 2 on the bed 3 is supported by the vehicle body 10 via the front and rear support members 26 and 27,
It does not affect each parallel link 23 or each elevating cylinder device 24. Therefore, no excessive load is applied to each of the parallel links 23 and each of the lifting and lowering cylinder devices 24, and the durability of each of the lifting and lowering cylinder devices 24 is reduced, and oil leakage from each of the lifting and lowering cylinder devices 24 is prevented. Can be.

In this way, the load 2 is transported by running the transport vehicle 1 while the load 2 is supported on the loading platform 3 via the pallet 29. At this time, as shown in FIG. 7, since the stopper 32 of the pallet 29 is engaged with the front surface of the carrier 3, the pallet 29 can be prevented from moving backward on the carrier 3 during transportation.

When the load 2 is unloaded from the trailer 4, as shown by the solid line in FIG.
By shortening the piston rod 25 of FIG. 4, each parallel link 23 rotates synchronously downward, and the carrier 3 descends from the load support position P1 to the lower limit position P2 while maintaining the horizontal posture, and Supported. Thereby, as shown in FIG. 5, the pallet 29 lands, and the load 2 is unloaded via the pallet 29. After that, the transport vehicle 1 is advanced, and the trailer 4 is removed from the hollow portion 30 of the pallet 29.

As described above, each of the lifting and lowering cylinder devices 24
Is operated to rotate each parallel link 23, even if the operation timing of any one of the lifting / lowering cylinder devices 24 slightly shifts, all the parallel links 23 rotate synchronously in the same direction. The carrier 3 moves up and down in a horizontal posture. As described above, by using the parallel link mechanism 22 including the plurality of parallel links 23, the bed 3 can always be moved up and down in a horizontal posture with a simple structure without requiring a complicated tuning mechanism.

In the above embodiment, as shown in FIG.
The transport vehicle 1 is composed of a trailer 4 having a carrier 3 and a towing vehicle 5 for towing the trailer 4, but may be a self-propelled truck having the carrier 3 at the rear.

In the above embodiment, the hydraulic drive type lifting / lowering cylinder device 24 is used as an example of the drive device. However, an air drive type may be used. In the above-described embodiment, the same number of ascending and descending cylinder devices 24 as the parallel links 23 are provided, and each of the parallel links 23 is individually rotated by the ascending and descending cylinder device 24.
Can be moved up and down in a horizontal posture even if the structure is rotated by one elevating cylinder device 24.

In the above embodiment, as shown in FIG.
The parallel link 23 is attached to the vehicle body 10 of the trailer 4 by two
Although two are provided on the left and right, three or more on the front and rear or three or more on the left and right may be provided.

[0027]

As described above, according to the first aspect of the present invention, at least one of the driving devices is used.
By rotating the parallel links, all the parallel links rotate synchronously in the same direction, so that the loading platform moves up and down in a horizontal posture. As described above, by using a plurality of parallel links, the bed can always be moved up and down in a horizontal posture with a simple structure without requiring a complicated tuning mechanism.

When the carrier is raised to the supporting position, the support member is interposed between the carrier and the vehicle body to support the carrier on the vehicle body side. And is not supported on the parallel link or the drive device through the vehicle body. Therefore, an excessive load is not applied to the parallel link and the driving device, and it is possible to prevent a decrease in the durability of the driving device.

[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 the transport vehicle.

FIG. 3 is a partially cutaway side view showing a vertical movement of the carrier.

FIG. 4 is a rear view of the transport vehicle.

FIG. 5 is a rear view when the trailer of the transport vehicle is inserted into the hollow portion of the pallet.

FIG. 6 is a rear view when a load is supported on a loading platform via a pallet.

FIG. 7 is a side view when a load is supported on a loading platform via a pallet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transport vehicle 2 Load 3 Loading platform 10 Vehicle main body 23 Parallel link 24 Elevating cylinder device (drive device) 26, 27 Support member P1 Load support position

Claims (1)

[Claims] 1. A transport vehicle provided with a carrier for supporting a load placed thereon, wherein the carrier has a horizontal posture via a plurality of parallel links rotatable vertically in a vertical plane. The vehicle body is provided on the vehicle body so as to be able to move up and down while being held, and the vehicle body is provided with a drive device for rotating at least one parallel link, and the carrier rises to reach a load supporting position for supporting the load. In this case, the transport vehicle is provided with a support member interposed between the carrier and the vehicle body to support the carrier on the vehicle body side.