JPH08245198A - Pallet slip preventing device available in time of order picking car traveling - Google Patents

Abstract

PURPOSE: To prevent the mislaying of a pallet and any dragging or the like from occurring by installing a pallet height detector in a mast unit in front of a driver's cab, and in a state that the height detection signal is outputted, lowering a fork whenever an operating signal of a down operating switch set up in and around this driver's cab is inputted twice. CONSTITUTION: A pallet height detector consisting of a limit switch is attached to a mast unit, while a limit switch LS13 is clamped to a lift bracket 11 at a specified height position from a car traveling road surface 12, then an operating piece 14 for the limit switch is clamped to an outer mast 9. This operating piece 14 is formed into such a length as operating the limit switch LS13 at less than the specified height from the traveling road surface 12. In the case where the operating piece 14 has operated the limit switch LS13 at the time of having operated a down operating switch, a down motion of a driver's cab 4 is stopped at the specified height position from the traveling road surface 12 by a control unit, and subsequently, an operation of this down operating switch 21 is once stopped and then when this switch 21 is reoperated, the down motion of a fork 6 is allowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing pallet pull-out during traveling of an order picking vehicle, which is intended to allow the user to concentrate on cargo handling work without paying unnecessary attention.

[0002]

2. Description of the Related Art In a conventional order picking vehicle, as shown in FIG. 5, a steering wheel arranged in a driver's cab and operation switches for cargo handling such as an up / down switch are provided on the vehicle body side.

[0003]

As described above, the order picking vehicle is provided with the steering wheel disposed in the driver's cab and the cargo handling operation switches such as the up / down switch on the vehicle body side, and the forks are used for the loading operation. When descending, it was configured to stop at the maximum lowered position of the lift cylinder, so it is not possible to judge whether the pallets are still stacked on the forks in the backward driving posture, and when moving to traveling operation, the pallet Problems such as misplacement and dragging of pallets occurred.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a pallet height detector is provided in a mast device in front of the driver's cab in an order picking vehicle in which a driver's cab rises and descends integrally with a fork. In the state where the height detection signal of the height detector is output, the fork is lowered again only when the operation signal of the lowering operation switch arranged near the driver's cab is input twice It was devised to solve various problems.

For the pallet height detector, there is a method of detecting the fork height from the rotation speed of a limit switch and an encoder as a mechanical structure.

The control device may be so constructed that the fork is lowered at a very low speed only when the operation signal of the descending operation switch arranged near the driver's cab is inputted twice.

[0007]

1 is a perspective view showing an order-picking vehicle embodying the present invention. The order-picking vehicle 1 includes a vehicle body 2, a mast device 3 arranged behind the vehicle body 2, and a mast device 3.
Includes a driver's cab 4 that can move up and down and a fork 6 fixed to the driver's cab 4, and a raising operation switch 20, a lowering operation switch 21, an accelerator 2 are provided in front of the operator's cab 4.
2 and a pallet height detector 5 are arranged, and the vehicle body 2 is equipped with a control device 7 and a battery 8 as a drive energy source, which will be described later.

FIG. 2 is a side view in which a pallet height detector 5 composed of a limit switch is attached to the mast device 3, and the mast device 3 has an outer mast 9 fixed to the vehicle body 2 and the outer mast 9 along the outer mast 9. The inner mast 10 moves up and down, and a lift bracket 11 that moves up and down is arranged on the inner mast 10. The lift cab 11 is equipped with a driver's cab 4. A fork 6 is fixed to the operator's cab 4, and a limit switch 13 is fixed to the lift bracket 11 at a predetermined height from a traveling road surface 12 of the order picking vehicle 1 and an outer mast 9 is an operating piece for operating the limit switch 13. 1
4 is fixed. The operating piece 14 has a length that always operates the limit switch 13 at a predetermined height or less from the traveling road surface 12.

The control device 7 includes the lowering operation switch 21.
When the operating piece 14 comes into contact with the limit switch 13 to operate the limit switch 13 while operating the, the operation signal is transmitted to the control device 7, and the lowering operation of the cab 4 is performed on the traveling road surface. Stop from 12 while keeping a predetermined height. After that, once the lowering operation switch 21 is stopped and the lowering operation switch 21 is operated again,
If the fork 6 descends and the reduction operation of the rod of the lift cylinder (not shown) stops, the fork 6 also stops.

FIG. 3 is a side view in which a pallet height detector 5 for detecting the height of a fork is attached to the mast device 3. The mast device 3 has an outer mast 9 fixed to the vehicle body 2 and the outer mast. 9 comprises an inner mast 10 which moves up and down along with 9, and a lift bracket 11 which moves up and down is arranged on the inner mast 10 and the operator cab 4 is mounted on the lift bracket 11. An encoder 30 is attached to the outer mast 9, and the encoder 3
A sprocket 32 is fixed to the rotary shaft 31 of 0, a chain 33 is engaged with the sprocket 32, one end of the chain 33 is fixed to the lower end of the outer mast 9, and the other end is fixed to the lift bracket 11. There is.

FIG. 4 is a flow chart showing the operating state of the control device 7 of the present invention, and is particularly limited to the case where the forks 6 (of course, the driver's cab 4 is also lowered). The fork 6 descends and the pallet height detector 5 operates (S
1). Even if the lowering operation switch 21 is still operating, it is stopped. However, once the operation of the lowering operation switch 21 is stopped and the lowering operation switch 21 is operated again after that, the forks 6 are lowered again (S2). Even if the descending operation switch 21 is continuously operated, the lift cylinder (not shown) is stopped at the highest descending position (S3). When the raising operation switch 20 is operated to raise the forks 6 and the pallet height detector 5 operates, the process returns to step 1.

[0012]

As described above, according to the present invention, the pallet height detector is provided in the mast device in the front of the cab, and the cab height detector outputs the height detection signal to the cab. It is equipped with a control device that lowers the fork again only when the operation signal of the descending operation switch arranged in the vicinity is input twice, and the fork always stops at a predetermined height from the road surface, so you forget to put the pallet, There is no need to drag the pallet, and even if you work backwards, you do not have to pay extra attention and you can improve the efficiency of cargo handling work.

Further, according to the present invention, the forks 6 are moved down at a very low speed to further prevent the load from collapsing when the pallet is placed on the ground.

[Brief description of drawings]

FIG. 1 is a perspective view showing an order picking vehicle embodying the present invention.

FIG. 2 is a diagram showing a mounted state of a pallet height detector including limit switches.

FIG. 3 is a diagram showing a state in which a pallet height detector configured to detect a fork height is attached to a mast device.

FIG. 4 is a flowchart showing an operating state of the control device of the present invention.

FIG. 5 is a perspective view showing a conventional order picking vehicle.

[Explanation of symbols]

 1 order picking vehicle 2 vehicle body 3 mast device 4 cab 5 pallet height detector 6 forks 7 controller

Claims (4)

[Claims] 1. In an order picking vehicle in which a driver's cab rises and descends integrally with a fork, a pallet height detector is provided in a mast device in front of the cab, and a height detection signal of the pallet height detector is provided. Is output,
A device for preventing pallet removal during traveling of an order picking vehicle, comprising a control device for which the fork is lowered again only when an operation signal of a lowering operation switch arranged near the cab is input twice. 2. In an order picking vehicle in which a driver's cab rises and descends integrally with a fork, a pallet height detector is provided in a mast device in front of the cab, and a height detection signal of the pallet height detector is provided. Is output,
A device for preventing pallet slippage during traveling of an order-picking vehicle, comprising a control device for causing the fork to descend at a slight speed again only when the operation signal of the descending operation switch arranged near the driver's cab is input twice. 3. A device for preventing pallet slippage during order picking vehicle travel, comprising a limit switch, in which the pallet height detector according to claim 1 is fixed to the mast device at a predetermined height from the travel road surface. 4. A device for preventing pallet slippage during traveling of an order picking vehicle, wherein the pallet height detector according to claim 1 comprises a fork height detector for calculating the height of the fork as it moves upward.