JPH0632943Y2 - Face moving device for cargo handling vehicles with push-pull - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a device for moving a face equipped with a seat gripper in the front-back direction along a fork claw that moves up and down in a push-pull cargo handling vehicle.

[Conventional technology]

The following are known as cargo handling vehicles with push-pull.

That is, a fork claw is provided so as to be able to move up and down along a mast provided on the front part of the vehicle body, and a face equipped with a seat gripper is provided along the fork claw so as to be movable in the front-rear direction.
The face pallet is moved forward to the frontmost position farthest from the vehicle body, the sheet pallet laid under the load is gripped by the sheet gripper, and the face pallet is moved forward while moving the face backward to the rear position close to the vehicle body. At the same time, the load is pulled onto the fork claws to perform the unloading work, and while the grip of the sheet pallet by the sheet gripper is released, the face is moved forward while the car body is running backwards and the load is carried along with the sheet pallet along the fork claws. Vehicle with push-pull that pushes out forward and puts the load.

As a device for moving the face in the forward-backward direction in such a cargo handling vehicle with push-pull, a base end portion of the telescopic link mechanism is attached to the frame, a face is attached to the tip end of the telescopic link mechanism, and the hydraulic pressure for extending and contracting the telescopic link mechanism is used. It is known that a cylinder is provided and a hydraulic cylinder is expanded and contracted to expand and contract an expandable link mechanism to move a face back and forth.

[Problems to be solved by the device]

With such a face moving device, a hydraulic pipe for supplying pressure oil to the hydraulic cylinder is required, and since the hydraulic pipe has a certain diameter, it is not only troublesome to dispose, but oil leaks, etc. Is likely to occur and the load may be soiled with oil, which is not preferable.

In order to expand and contract the hydraulic cylinder, the operating valve is switched by switching the operating lever to supply pressure oil from the hydraulic source to the expansion chamber and the contraction chamber of the hydraulic cylinder. Since the extension pressure is increased by increasing the hydraulic pressure of the control lever, it takes time for the hydraulic pressure in the extension chamber and the reduction chamber to increase after operating the operating lever until the face moves back and forth after operating the operating lever. Not only is there a time delay and the responsiveness is poor, but the movement of the face is determined by the telescopic flow of the hydraulic cylinder, and the telescopic stroke of the hydraulic cylinder is determined by the pressure oil supply amount, but is not supplied to the hydraulic cylinder. It is difficult to control the amount of pressure oil that is generated by the operating valve minutely, and it is very difficult to finely move the facet. , There is to be a movement was jerky.

Therefore, an object of the present invention is to provide a face moving device for a cargo handling vehicle with a push-pull capable of solving the above-mentioned problems.

[Means and Actions for Solving the Problems]

A feed screw rod that is rotated forward and backward by an electric motor is screwed into a nut member provided in the telescopic link mechanism to drive the electric motor so that the face can move smoothly back and forth with good responsiveness.

〔Example〕

As shown in FIG. 1, the vehicle body 1 is provided with driving wheels 2, steering wheels 3, a driver's seat 4 and a steering member 5, and a mast 6 is tilted forward and backward by a tilt cylinder 7 at the front of the vehicle body 1. The fingerboard 8 is freely provided, and the fingerboard 8 can be moved up and down along the mast 6.
A fork claw 9 is attached to the fork, and a face 10 is provided so as to be movable in the front-rear direction by a moving device 11.
A sheet gripper 14 including a sheet receiving piece 12 and a pressing piece 13 is provided below the face 10, and a sheet pallet B laid under the load A is placed between the sheet receiving piece 12 and the pressing piece 13. No, the load handling vehicle with push-pull is configured such that the pressing piece 13 is moved and the sheet pallet B is held by the sheet receiving piece 12 and the pressing piece 13.

As shown in FIGS. 1 and 2, the moving device 11 includes a vehicle body side link mechanism 22 composed of a pair of upper and lower X-shaped link pairs 20 and 21, and a face composed of a pair of upper and lower X-shaped link pairs 23 and 24. The side link mechanism 25 is provided, and one end of each link of the vehicle body side link mechanism 22 and one end of each link of the face side link mechanism 25 are connected by the vertical axis 26 to form an extendable link mechanism. The end portion is connected to the frame 27 provided on the finger board 8 through the vertical pin 33 and the long groove 34, and the other end of each link of the face side link mechanism 25 is connected to the face 10 through the vertical pin 31 and the long groove 32. The electric motor 28 provided on the frame 27 is connected to a reducer 29, the output side of the reducer 29 is connected to a feed screw rod 30 such as a ball screw, and the feed screw rod 30 is connected to the lower X side. One link Jo link pairs 21 2
A nut member 32 that is swingably connected to 1a by a vertical pin 31.
, And the electric motor 28 is driven in the forward direction to drive the feed screw rod 3
When 0 is rotated in the forward direction, the telescopic link mechanism is extended as shown in FIG. 2 to move the face 10 forward, and when the electric motor 28 is driven in the reverse direction to rotate the feed screw rod 30 in the reverse direction, the telescopic link mechanism is moved as shown in FIG. The face 10 moves backward as it shrinks.

The speed reducer 29 is provided with bevel gears and the like so that the input side and the output side are at right angles.

The vehicle body 1 is provided with an operation lever 40 for switching movement of faces, and front and rear strokes of the operation lever 40 are detected by a potentiometer 41 as shown in FIG. 4, and the detected stroke is a motor current controller 42.
In addition, the forward and backward operations of the operating lever 40 are detected by the limit switches 43, 44 and the like and input to the motor current controller 42, and the signal from the motor current controller 42 causes the motor current controller 42 to operate.
A forward rotation current and a reverse rotation current are sent to 8, and the current value is proportionally increased or decreased based on the detection stroke. When the operation stroke of the operation lever 40 increases, the current value increases and the electric motor 28 rotates at high speed. However, when the operation stroke becomes short, the current value becomes small and the electric motor 28 rotates at a low speed.

In addition, a stroke end signal is input to the controller 42 from the stroke end detecting means 45 at which the face 10 is at the front stroke end position and the rear stroke end position, and the controller 42 outputs a brake signal to the electric motor 28 for braking and at the same time, the The supply is stopped and the face 10 is stopped.

The stroke end detecting means 45, as shown in FIG.
The first switch 46 and the second switch 47 are provided on both sides of the long groove 32 of the face 10, and the first switch 43 is turned on by the pin 31 at the rear stroke end, and the pin 31 turns the second switch 44 off at the front stroke end.
It is set to N.

The stroke end detection means 45 is provided with an ultrasonic wave transmitter / receiver on the frame 27 and a reflection plate on the face 10 so that the phase difference between the transmitted ultrasonic wave and the received ultrasonic wave causes a difference between the frame 27 and the face 10. The distance may be measured and the front stroke end signal and the rear stroke end signal may be output when the distance reaches a preset value. Alternatively, a potentiometer may be provided in the rotating portion of the electric motor 28. It is also possible to detect the rotational position by outputting a forward stroke end signal when a constant rotation is made in one direction from the intermediate point and output a backward stroke end signal when a constant rotation is made in the other direction.

Further, the nut member 32 may be provided on the connecting pin 21b of the lower vehicle body side link pair 21 as shown in FIG. 6, and the feed screw rod 30 may be oriented at a right angle to the face 10.

[Effect of device]

The feed screw rod 30 is rotated forward and backward by the electric motor 28 to extend and contract the telescopic link mechanism to move the face 10 in the front-rear direction with respect to the vehicle body side. Further, the electric motor 28 is provided on the base end side of the fork pawl 9. Therefore, since it suffices to connect a thin power cable to the electric motor 28, the wiring work is simplified, and the load is not contaminated due to oil leakage.

Further, the electric motor 28 is driven by sending an electric current without a time delay, so that the electric motor 28 has good responsiveness, and furthermore, the electric motor 2
Since the rotation speed of 8 can be controlled minutely by the current value, the moving speed of the face 10 can be controlled minutely by controlling the rotation speed of the feed screw rod 30 minutely.
You can move 0 smoothly.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a front view of a cargo handling vehicle with push-pull, Fig. 2 is a plan view of a face moving device, Fig. 3 is an operation explanatory diagram, and Fig. 4 is control. Fig. 5 is a circuit diagram, Fig. 5 is a plan view of the stroke end detecting means, and Fig. 6 is a plan view showing another example of the face moving device. 1 is a vehicle body, 9 is a fork claw, 10 is a face, 14 is a sheet gripper, 27 is a frame, 28 is an electric motor, 3
0 is a feed screw rod and 32 is a nut member.

Claims (1)

[Scope of utility model registration request] 1. A face 10 provided with a seat gripper 14 is provided along a fork claw 9 provided on the vehicle body side so as to be movable back and forth between a front position and a rear position. In a push-pull cargo handling vehicle that grips and releases the laid sheet pallet B, a frame 27 is provided at the base end of the fork claw 9, and one end of the telescopic link mechanism is connected to the frame 27, and the other end. Side, the face 10 is connected, the frame 27 is provided with an electric motor 28, a feed screw rod 30 is connected to the output side of the electric motor 28, and the feed screw rod 30 is provided in the telescopic link mechanism. A face moving device for a cargo handling vehicle with a push-pull, which is screwed to 32.