JP3267573B2 - Cargo handling vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo handling vehicle such as a dump truck.

[0002]

2. Description of the Related Art Conventionally, for example, a dump truck is shown in FIG.
It is configured as shown in FIG. That is, the vehicle body 1
Is composed of a front body 3 provided with a pair of left and right front wheels 2 and a rear body 5 provided with rear wheels 4 on the left and right. The front body 3 and the rear body 5 The coupling device 6 is connected to a steering cylinder device 7 at a portion of the coupling device 6.
An operating unit 8 is provided above the front vehicle body 3.

[0003] The rear body 5 has a carrier 2
A plurality of lift cylinder devices 26 and a pair of left and right multistage dump cylinder devices 27 are provided between the rear vehicle body 5 and the loading platform 25. Note that the vessel 28 can be placed on the carrier 25.

[0004] Such a dump truck (cargo handling vehicle)
In the above, the carriage 25 is lifted by the extension movement of the group of lift cylinder devices 26, so that it can run in a fixed state at the ascending position as shown by the solid line, and the carriage portion 25 is moved by the contraction movement of the group of lift cylinder devices 26. 25
Is lowered, the landing of the vessel 28 can be performed, and at the ascending position, the dumping cylinder device 27 is extended to rotate the loading platform 25 around the support shaft 29 as shown by a virtual line. You can dump.

[0005] By the way, for example, tunnel work includes excavation, blasting, loading and shearing, concrete spraying,
Is repeatedly performed. Therefore, in order to turn the work cycle in a short time for efficiency, it is necessary to increase the transportation speed by the dump truck as much as possible. However, the longer the excavation distance from the tunnel entrance becomes, the longer the transport distance becomes. Become.

[0006] Therefore, at the work site, while keeping the safety while prohibiting the passage of the inside of the tunnel during the slippage, the transportation work is speeded up and the time required for the slippage is shortened.

[0007]

By the way, there are many places where the roadbed is bad in the tunnel, and there is a possibility that the bottom of the vessel 28 may be dragged when the vehicle is running. You are traveling in the ascended position. However, when the dump truck enters the tunnel at a low speed in reverse, the traveling visibility is narrowed by the fixed vessel 28 at the ascending position, so that not only the traveling speed in the tunnel is reduced but also the traveling speed in the tunnel is reduced. The speed of transportation is reduced or stopped when passing a tunnel or passing through a tunnel in the space. Further, it takes time to adjust the position of engagement with the loading machine and the like, and sometimes the collision or contact with the loading machine is caused, so that the loading operation is delayed.

Accordingly, an object of the present invention is to provide a cargo handling vehicle capable of fixing a cargo handling device at an intermediate elevation position at any time.

[0009]

In order to achieve the above object, a cargo handling vehicle according to a first aspect of the present invention has a driving unit and a cargo handling device which are disposed in front of and behind a vehicle body. The loading and unloading device comprises a support shaft that can be adjusted vertically with respect to the vehicle body by a lift cylinder device, a loading platform that is rotatable around the support shaft, and a rotation support provided between the vehicle body and the loading platform. It comprises a cylinder device and each movement amount detection means of both cylinder devices, and is configured to stop both cylinder devices at the intermediate extension position based on detection by both movement amount detection means by an intermediate stop operation in the control unit. It is characterized by the following.

Therefore, according to the first aspect of the present invention, the cargo handling device is fixed at the intermediate elevating position at any time, so that the traveling field of view when the vehicle is traveling backward is fixed relative to the traveling field of view when it is fixed at the elevated position. And spread it. Further, by widening the traveling field of view, for example, the position of engagement with the loading machine or the like can be easily and quickly adjusted, and the number of collisions or contact with the loading machine can be minimized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
The state adopted for the dump truck will be described with reference to FIGS. In the embodiment of the present invention, components that are the same as or similar to the above-described conventional configuration (FIG. 6) are assigned the same reference numerals, and details thereof are omitted.

1 and 2, 1 is a vehicle body, 2 is a front wheel, 3 is a front vehicle body, 4 is a rear wheel, 5 is a rear vehicle body, 6 is a coupling device, 7 is a steering cylinder device, 8 Indicates an operation unit.

A cargo handling device 10 is disposed above the rear vehicle body 5 in a state where the cargo handling device 10 is separated from the vehicle body 1 by a driving unit 8. That is, a loading platform 11 is provided above the rear body 5, and a support shaft 12 in the vehicle width direction is provided at a rear portion of the loading platform 11, and the support shaft 12 is provided.
A pair of links 13 are provided in the vehicle width direction between the vehicle body 5 and the rear vehicle body 5, so that the carrier 11 is rotatable via the support shaft 12. Furthermore, the support shaft 12 and the rear body 5
The lift cylinder device 14 is provided between the support shaft 12 and the support shaft 12, so that the vertical position of the support shaft 12 with respect to the vehicle body 1 can be adjusted by the lift cylinder device 14.

A pair of rotating cylinder devices 1 is provided between the rear vehicle body 5 and the front of the loading platform 11 in the vehicle width direction.
5 is provided, wherein the rotating cylinder device 15 is disposed so as to be inclined such that the lower portion is rearward. The operation amount detecting means 16 of the lift cylinder device 14 is provided on the cylinder body, and the operation amount detecting means 17 of the rotating cylinder device 15 is provided on the cylinder body. Here, both operation amount detecting means 16 and 17
Is, for example, a type that detects that the detection objects connected to the piston rod side are integrally moved, and is always in the detection state.

The vessel 18 can be placed on the carrier 11. An example of the cargo handling device 10 is configured by the above 11 to 18 and the like.

The operating section 8 is provided with a control section (control box) 19, and by an intermediate stop operation by an intermediate switch 20 provided in the control section 19, based on the detection by both operation amount detecting means 16, 17. The two cylinder devices 14 and 15 are configured to stop at the set intermediate expansion / contraction position. In addition, the set value of the intermediate expansion / contraction position is adjustable.

The operation of the above embodiment will be described below.

During normal traveling of the dump truck, the vessel 18 can be fixed at the raised position as shown by the solid line in FIG. Thus, high-speed traveling can be performed without fear of dragging the bottom of the vessel 18. In addition, the vehicle can be transported out of the tunnel at a high speed in the same manner, after grasping the condition of the roadbed in the tunnel.

When entering the tunnel at low speed in reverse, the vessel 18 is fixed at an intermediate position as shown by the imaginary line in FIG. 1 after grasping the condition of the roadbed in the tunnel. And

In the following, a description will be given with reference to FIGS. 4 and 5. Here, the expansion and contraction operation of the two cylinder devices 14 and 15 is performed by opening and closing a valve.
The amount of expansion and contraction of both cylinder devices 14 and 15 is detected by both operation amount detecting means 16 and 17. Then, the set middle extension position is referred to as a set position.

That is, first, the intermediate stop switch 20 is depressed (step 1), and both operation amount detecting means 16 and 17 are operated.
Then, it is determined whether or not the height of the vessel 18 is at the set position based on the current detection value (step 2).

If yes, the lamp at the vessel height setting position is turned on, and the operation ends. When the result is NO, it is determined whether the amount of expansion and contraction of the lift cylinder device 14 is equal to or less than the set position (step 3).

Here, when the result is NO, the lift cylinder device 14 is extended. If the answer is YES, it is determined whether or not the amount of expansion and contraction of the rotation cylinder device 15 is not more than the set position and not more than the set position while the extension movement of the lift cylinder device 14 is stopped (step 4).

Here, when the result is NO, the extension movement of the rotation cylinder device 15 is stopped, and when the result is YES, the rotation cylinder device 15 is extended. Next, it is determined whether or not the amount of expansion and contraction of the rotating cylinder device 15 is equal to or greater than the set position (step 5).

If the answer is "NO" here, it is determined whether or not the amount of expansion and contraction of the lift cylinder device 14 is equal to or less than the set position (step 6).

Here, when the answer is NO, the extension movement of the lift cylinder device 14 is stopped. In the case of Jesus,
It is determined whether or not the amount of expansion and contraction of the lift cylinder device 14 is equal to or greater than the set position (step 7).

Here, when the result is NO, the extension movement of the lift cylinder device 14 is stopped. In the case of Jesus,
The lift cylinder device 14 is extended.

When it is determined whether or not the amount of expansion and contraction of the rotation cylinder device 15 is equal to or greater than the set position (step 5), if the determination is yes, the rotation cylinder device 1
It is determined whether or not the amount of expansion and contraction of No. 5 is equal to or less than the set position (step 8).

Here, when the answer is NO, the contraction movement of the rotating cylinder device 15 is stopped. In the case of Jesus,
The rotating cylinder device 15 is contracted and moved.

Next, it is determined whether or not the amount of expansion and contraction of the lift cylinder device 14 is equal to or less than a set position (step 9).

Here, when the result is NO, the contraction movement of the lift cylinder device 14 is stopped. In the case of Jesus,
It is determined whether or not the amount of expansion and contraction of the lift cylinder device 14 is equal to or greater than the set position (step 10).

Here, when the answer is NO, the contraction movement of the lift cylinder device 14 is stopped. In the case of Jesus,
The lift cylinder device 14 is contracted and moved.

By operating as described above, as shown by the imaginary line in FIG. 1, the loading / unloading device 10, that is, the vessel 18 is fixed at the intermediate elevating position (set position) at any time, so that the vehicle can travel backward. The traveling field of view A at the time is widened with respect to the traveling field of view a when the vessel 18 indicated by the solid line is fixed at the raised position. As a result, the traveling speed in the tunnel can be considerably increased, and even when passing through or passing through the tunnel in a limited space in the tunnel, the vehicle is hardly stopped and the transport speed is reduced. Can be increased.

Further, by widening the traveling field of view A,
For example, as shown in FIG. 3, the adjustment of the position of engagement with the loading machine 21 or the like can be easily and quickly performed, and the number of collisions or contact with the loading machine 21 can be extremely reduced.
Loading work can be performed efficiently. As a result, the speed of transportation by the dump truck can be increased, the slippage time can be shortened, and the work cycle can be accelerated.

By lowering the carrier 11 by the contraction movement of the lift cylinder device 14 and the rotation cylinder device 15, the landing can be performed with the vessel 18 at the lowered position.
5 by extending, as shown by the imaginary line in FIG.
The loading unit 11 can be rotated via the support shaft 12 to perform a dumping operation.

In the above-described embodiment, the dump truck is shown as a cargo handling vehicle, but this can be applied to another type of cargo handling vehicle.

[0037]

According to the first aspect of the present invention, the loading / unloading device is fixed at the intermediate elevation position at any time, so that the traveling view at the time of reverse traveling is fixed at the elevation position. It can be spread to the driving field of view. This makes it possible, for example, to significantly increase the traveling speed in a tunnel, and to minimize the need to stop when passing a vehicle or passing through a tunnel in a limited space within the tunnel. Can be increased.

Furthermore, by widening the traveling field of view, it is possible to easily and quickly adjust the position of engagement with a loading machine, etc., and to minimize the number of collisions or contact with the loading machine. The loading operation can be performed efficiently because the loading can be performed. As a result, the transport speed of the dump truck can be increased, the slippage time can be reduced, and the work cycle can be accelerated.

[Brief description of the drawings]

FIG. 1 is a side view of a cargo handling vehicle, showing an example of an embodiment of the present invention.

FIG. 2 is a rear view of the cargo handling vehicle.

FIG. 3 is a side view of the cargo handling vehicle during a loading operation.

FIG. 4 is a flowchart of the cargo handling vehicle.

FIG. 5 is a flowchart of the same cargo handling vehicle.

FIG. 6 is a side view of a cargo handling vehicle, showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 8 Operating part 10 Cargo handling device 11 Cargo part 12 Support shaft 14 Lift cylinder device 15 Rotating cylinder device 16 Operation amount detection means 17 Operation amount detection means 18 Vessel 19 Control part (control box) 20 Intermediate stop switch 21 Loading machine A Driving view

Continuation of the front page (56) References JP-A-3-121940 (JP, A) JP-A-2-193732 (JP, A) JP-A-6-247697 (JP, A) Jpn. , U) Hikaru Hei 5-82657 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60P 1/02 B60P 1/34

Claims (1)

(57) [Claims] An operation unit and a cargo handling device are disposed in front of and behind a vehicle body, and the cargo handling device includes a support shaft that can be adjusted vertically with respect to the vehicle body by a lift cylinder device;
It consists of a bed part rotatable around this support shaft, a rotating cylinder device provided between the vehicle body and the bed part, and each movement amount detecting means of both cylinder devices. A cargo handling vehicle characterized in that both cylinder devices are stopped at an intermediate telescopic position based on detection by both operation amount detecting means by an operation.