JP2000229796A - Remote controller for work machine in fork light truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent danger for a worker when he operates a remote controller for a work machine. SOLUTION: In a remote controller for a work machine in a fork lift truck which is provided with a lever body in a remote controller box 11 to remote control a lift device mounted on a vehicle body 2 by this lever body through a controller 9 mounted on a vehicle, a parking lever switch 14a and a neutral switch 14b for confirming the stop of running of the vehicle body 2 are provided, and a limit mechanism part 15 enabling the remote operation of the lift device in the lever body only when the stop of running of the vehicle body 2 is confirmed by these switches is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control for a working machine for remotely controlling a working machine mounted on a vehicle body of a forklift truck.

[0002]

2. Description of the Related Art As a working machine mounted on a forklift truck, for example, a lift device is known. As shown in FIG. 1, this lift device 1 can be tilted forward and backward by a tilt cylinder 3 at a front portion of a vehicle body 2. A pair of left and right masts 4, a lift bracket 6 that can be moved up and down by a lift cylinder 5 along the mast 4, and a structure in which the lift bracket 6 is provided with a fork 7. The lift cylinder 5 and the lift cylinder 5 are controlled by an on-board controller 9 mounted inside the vehicle body 2 via an electromagnetic control valve 8 that supplies pressure oil thereto.
Conventionally, there has been known a working machine remote for remotely controlling the lift device 1 as the working machine.

As a remote control for the working machine, a remote control box connected to the on-board controller 9 by wire is provided. The remote control box is provided with a tilt lever body and a lift lever body, and an operator operates the tilt lever body. By doing so, the mast 4 is tilted forward or backward by the tilt cylinder 3 via the on-board controller 9, and the lift bracket 6 by the lift cylinder 5 via the on-board controller 9 is operated by operating the lift lever body. The fork 7 was raised or lowered.

[0004]

When using the above-mentioned remote control for a working machine, an operator gets off the driver's seat of the vehicle body and remotely controls the lift device using the remote control for the working machine outside the vehicle body. However, at this time, the operator often operates the remote control for the working machine while standing at a position where the lift device can be reliably seen, for example, at the front or near the vehicle body.
Therefore, when the operator operates the remote control for the work equipment,
If the vehicle body is not securely stopped, there is a possibility that a danger may be given to an operator, and a safety problem such as an accident may occur. An object of the present invention is to solve this problem.

[0005]

According to a first aspect of the present invention, an operating body for a working machine is provided in a remote control box, and the working machine mounted on the vehicle body is remotely controlled by the operating body for the working machine via an on-board controller. The forklift truck has a work machine remote control, which is provided with body stop confirmation means for confirming the stop of the running of the vehicle body. The work machine is provided with a restriction mechanism that enables remote control.

According to a second aspect of the present invention, in the first aspect, an emergency stop switch is provided in the remote control box, and when the emergency stop switch is operated, the on-vehicle controller for controlling the working machine is stopped and the engine of the forklift truck is operated. An emergency stop mechanism for stopping the operation is provided.

[0007]

According to the first aspect of the present invention, the remote control of the working machine in the operating body for the working machine is enabled only when the running stop of the vehicle body is confirmed by the vehicle body stop confirming means. In the case of operating the work machine remote controller, it is possible to prevent the work machine from being remotely controlled unless the vehicle body is securely stopped.

According to the second invention, when the emergency stop switch is operated, the on-vehicle controller for controlling the working machine is stopped, and the engine of the forklift truck is stopped. The work machine can be reliably stopped in an emergency.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a remote control for a working machine in a forklift truck according to the present invention will be described. As shown in FIG. 1, a lift device 1, which is a type of a working machine mounted on a forklift truck, includes a pair of left and right masts 4 that can be tilted back and forth by a tilt cylinder 3 at a front portion of a vehicle body 2, as in the related art. A lift bracket 6 that can be moved up and down by a lift cylinder 5 along the mast 4 is provided. The lift bracket 6 is provided with a fork 7, and the tilt cylinder 3 and the lift cylinder 5 It is controlled by an on-board controller 9 mounted inside the vehicle body 2 via each electromagnetic control valve 8 for supplying oil.

As shown in FIG. 2, a remote controller for a working machine for remotely controlling the lift device 1 is connected to a vehicle-mounted controller 9 mounted inside the vehicle body 2 by a connection cord 10 by a wire. A box-shaped remote control box 11 is provided, and a lever body 12a that is a working machine operating body 12 is provided on an upper surface of the remote control box 11,
The lever body 12a is movable in the front-rear direction and the left-right direction, respectively, and is moved by the lever body 12a in the front-rear direction (indicated by the black arrow in FIG. 2), whereby the lift cylinder 5 Bracket 6
The fork 7 is raised or lowered, and the lever body 12a is moved in the left-right direction (indicated by a white arrow in FIG. 2), whereby the mast 4 is tilted forward or backward by the tilt cylinder 3 via the on-vehicle controller 9. The tilting operation, that is, two operations of tilting the mast 4 back and forth and lifting and lowering the lift bracket 6 and the fork 7 can be operated. Further, a seesaw power switch 13 is provided on the upper surface of the remote control box 11, and the power of the work machine remote control is turned on / off by the power switch 13.

In the working machine remote control as described above, first, the vehicle body stop confirmation means 14 for confirming the stop of traveling of the vehicle body 2 is provided, and the vehicle body stop confirmation means 14 is provided in the driver's seat of the vehicle body 2. A parking lever switch 14a which is mounted on the parking lever and is turned on when the parking lever is operated, and a neutral switch 14b which is mounted on a forward / reverse lever provided on the driver's seat of the vehicle body 2 and is turned on when the forward / reverse lever becomes neutral. The stop of traveling of the vehicle body 2 is confirmed by turning on the parking lever switch 14a and turning on the neutral switch 14b. Only when it is confirmed by the parking lever switch 14a and the neutral switch 14b that the vehicle body 2 has stopped traveling, the limiting mechanism 1 that enables the remote operation of the lift device 1 on the lever body 12a of the remote control box 11
5 is provided. As the limiting mechanism 15, the parking lever switch 14a is turned on and the neutral switch 1 is turned on.
When the switch 4b is turned on, that is, when it is confirmed that the traveling of the vehicle body 2 is stopped, electricity from the power supply is transmitted to the power switch 13 of the work machine remote controller.

Further, a push button type emergency stop switch 16 is provided on the upper surface of the remote control box 11, and when the emergency stop switch 16 is turned on, the lift device 1 is turned on.
And an emergency stop mechanism 17 for stopping the on-vehicle controller 9 for controlling the engine and stopping the engine of the forklift truck. The emergency stop mechanism 17 cuts off the power supply to the on-vehicle controller 9 when the emergency stop switch 16 is turned on, and also cuts off the power supply to the engine of the forklift truck. Will be stopped. When the on-vehicle controller 9 and the engine are stopped as described above, the spool of each electromagnetic control valve 8 is fixed, and the lift device 1 is also fixed.

Next, an electric circuit configuration of the working machine remote controller will be described. As shown in FIG. 3, the lever body 12a is
Potentiometer 1 for detecting the forward / backward movement of
8 and a potentiometer 19 for detecting the movement of the lever body 12a in the left-right direction. These two potentiometers 18 and 19 are connected to the in-vehicle controller 9 via the connection cord 10. And the onboard controller 9
Is connected to an electromagnetic control valve 8 for supplying pressure oil to the tilt cylinder 3 of the lift device 1 and an electromagnetic control valve 8 for supplying pressure oil to the lift cylinder 5 so as to control the lift device 1 via these components. Become.

The power switch 13 provided in the remote control box 11 of the working machine remote controller is connected to a power source 20 via a neutral switch 14b and a parking lever switch 14a constituting a limiting mechanism 15 to supply power. And the other side is connected to a first relay 21 via a second relay 22 described later, and the first relay 21 opens and closes a circuit connecting the power supply 20 and the on-vehicle controller 9. The circuit is closed to supply power to the on-vehicle controller 9 when in the ON state.
The other side of the power switch 13 is branched and connected to the emergency stop switch 16.
6 is connected to a second relay 22, which opens and closes a circuit connecting the power switch 13 and the first relay 21. When the circuit is turned on, the circuit is opened to supply power to the first relay 21. It cuts the supply. Further, the second relay 22 is connected to a third relay 23. The third relay 23 opens and closes a circuit for supplying power to an engine of the forklift truck. The emergency stop mechanism 17 is constituted by the second relay 22 and the third relay 23 and this circuit.

With such an electric circuit configuration, the power switch 13 of the remote control box 11 is turned on, and the parking lever switch 14a and the neutral switch 1 are turned on.
4b are on, the in-vehicle controller 9
The power supply to the vehicle-mounted controller 9 is stopped when either the parking lever switch 14a or the neutral switch 14b is off.

When the power switch 13 is turned on, the parking lever switch 14a and the neutral switch 14
b is on, the emergency stop switch 1
When the power supply 6 is turned on, first, the second relay 22 is turned on to cut off the power supply to the first relay 21, and when the power supply to the first relay 21 is cut off, the first relay 21 is turned off and the onboard controller 9 is turned off. To cut off the power supply. Further, the third relay 23 is also turned on to cut off the power supply to the engine of the forklift truck.

As described above, the parking lever switch 14
When the operator operates the remote control for the work equipment outside the vehicle body 2 by enabling the remote control of the lift device 1 on the lever body 12a only when the traveling stop of the vehicle body 2 is confirmed by the a and the neutral switch 14b. The remote control of the lift device 1 cannot be performed unless the vehicle body 2 is securely stopped.

Further, when the emergency stop switch 16 is operated, the on-vehicle controller 9 for controlling the lift device 1 is stopped, and the engine of the forklift truck is stopped. The device 1 can be brought to an emergency stop.

In the above description, the lift device 1 is used as a working machine, but the present invention is not limited to this, and other attachments such as a side clamp device, a rotary fork device, or a fork Instead, a crane device with a crane may be used.

Although the parking lever switch 14a and the neutral switch 14b are both used as the vehicle stop confirmation means 14 for confirming that the vehicle 2 has stopped traveling, only one of the parking lever switch 14a and the neutral switch 14b may be used. Any other device, such as an in-vehicle sensor that detects movement, can be used as long as it can confirm the running stop of the vehicle body 2.

A limiting mechanism 15 for enabling remote operation of the lift device 1 on the operating body 12 for the working machine only when it is confirmed that the vehicle body 2 has stopped traveling, and an emergency stop switch 16
The emergency stop mechanism 17 that stops the on-vehicle controller 9 that controls the lift device 1 and stops the engine of the forklift truck when is operated is not limited to the above-described one, and has the same function. If so, it may be something else.

[0022]

According to the present invention, the remote control of the working machine in the operating body for the working machine is enabled only when the stopping of the running of the body is confirmed by the body stop confirming means, so that the worker operates the remote control for the working machine outside the body. In this case, remote control of the work machine cannot be performed unless the vehicle body is stopped securely, eliminating the danger to workers and eliminating safety problems such as accidents. , Can greatly improve safety. In addition, when the emergency stop switch is activated, the on-board controller that controls the work machine is stopped, and the engine of the forklift truck is stopped. Therefore, it is possible to prevent any danger to the operator beforehand, and also to greatly improve the safety.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a forklift truck.

FIG. 2 is a perspective view showing a remote controller for a working machine in a forklift truck according to the present invention.

FIG. 3 is an electric circuit configuration of a remote control for a working machine in a forklift truck according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lift device, 2 ... Body, 3 ... Tilt cylinder, 4 ...
Mast, 5 ... lift cylinder, 6 ... lift bracket,
7 fork, 8 electromagnetic control valve, 9 onboard controller, 10 connection cord, 11 remote control box, 12
... operating body for working machine, 12a ... lever body, 13 ... power switch, 14 ... vehicle stop confirmation means, 14a ... parking lever switch, 14b ... neutral switch, 15 ... restriction mechanism section, 16 ... emergency stop switch, 17 ... emergency Stop mechanism, 18: potentiometer, 19: potentiometer, 20: power supply, 21: first relay, 22: second relay, 23: third relay.

Claims (2)

[Claims] 1. A forklift truck in which a remote control box 11 is provided with a working machine operating body 12, and the working machine mounted on the vehicle body 2 is remotely controlled by the working machine operating body 12 via a vehicle-mounted controller 9. A vehicle-body-stop confirming means 1 for confirming that the vehicle body 2 has stopped traveling in a remote control for a work machine.
The vehicle body stop confirmation means 14 includes the vehicle body 2
Only when it is confirmed that the traveling of the operating
Mechanism 15 that enables remote operation of work equipment
A remote control for a working machine in a forklift truck, comprising: 2. An emergency stop mechanism which is provided with an emergency stop switch 16 in the remote control box 11 and which, when the emergency stop switch 16 is operated, stops the on-vehicle controller 9 for controlling the working machine and stops the engine of the forklift truck. The remote controller for a working machine in a forklift truck according to claim 1, further comprising a part (17).