JPH06313328A - Working machine operating device for industrial machine - Google Patents

Abstract

PURPOSE:To automatically stop a working machine for improving the safety of an industrial machine even in the case where danger exists in an dead angle to an operator within a working domain or the operator does not notice the danger notwithstanding that it is visible to him. CONSTITUTION:A lever function releasing means which can be changed over into a short rest state or a free state in the direction of expansion and contraction by turning ON or OFF a hydraulic or electric input is insertedly attached in a linkage for mutually connecting the operating lever part of a working machine operating valve being manually operated and its operating lever 6. The input section of the lever function releasing means is connected to a control section controlled by a controller 23 for processing a signal sent from a danger detecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work machine operating device for industrial machines such as construction vehicles such as power shovels and industrial vehicles.

[0002]

2. Description of the Related Art For example, in a work machine operating device for a power shovel, an actuator such as a swing motor is operated by manually operating a direction switching valve to control the supply of pressure oil from a hydraulic pump to operate the operating direction. It is supposed to be done.

[0003]

In the above-described conventional work machine operating apparatus, since all the operations are manual operations by the operator as described above, there is a danger in the blind spot of the operator or a simple operation. It was not possible to prevent the occurrence due to an operator error.

The present invention has been made in view of the above, and when there is a danger in the working range of the working machine, the operating valve is automatically returned to the neutral position so that there is a danger in the blind spot of the operator. When there is a danger in the working range of the work machine, whether it is visible to the operator or not noticed by the operator, the work machine can be automatically stopped and the safety of the industrial machine can be improved. It is an object of the present invention to provide a work machine operating device for an industrial machine.

[0005]

In order to achieve the above object, a working machine operating device for an industrial machine according to the present invention is provided in a linkage for connecting an operating lever of a working machine operating valve to be manually operated with an operating lever 6. ON or O of hydraulic or electric input
The lever operation releasing means that can be switched between the integrated state and the free state in the expansion / contraction direction by the FF is provided, and the input portion of the lever operation releasing means is controlled by the controller 23 that processes the signal from the danger detecting means. It is connected to the control unit.

[0006]

[Operation] During normal operation, the lever operation releasing device is integrated, and therefore the operation valve 6 is switched by operating the operation lever 6. On the other hand, when the danger detecting means detects a danger, a signal is input to the lever operation releasing means via the controller 23, and the signal is brought into a free state, so that the operation valve returns to neutral regardless of the attitude of the operation lever 6, and the working machine is operated. Is stopped.

[0007]

EXAMPLES Examples of the present invention will be described, for example, in a working machine operating device for a power shovel, and a turning device therein. In the figure, reference numeral 1 is a main operation valve having a built-in directional control valve for controlling a plurality of operating devices such as a traveling device, a bucket operating device, and an arm operating device in a power shovel, and 2 is a swing operating valve among them. This turning operation valve 2 is manually operated by operating the operating rod 2a, and by switching operation thereof, the pressure oil from the main pump 3 is selectively supplied to the left rotation side or the right rotation side of the rotation motor 4 and the upper portion. By turning the revolving unit to the left, turning to the right, or in a neutral state, the supply of the pressure oil is stopped, the revolving motor 4 is stopped, and the revolving unit is stopped in that state. . The operation valves are spring-biased in the direction of returning to neutral by the biasing forces of the springs 5a and 5b interposed at both ends of the spool.

The operating rod 2a of the turning operation valve 2 and the operating lever 6 are connected via a lever operation releasing device 7. The lever operation releasing device 7 is configured as shown in FIG. 2, and includes a first cylinder 9 having one end connected to a push-pull wire 8 connected to the operating rod 2a of the turning operation valve 2 and a link 10 of the operation lever 6. Second cylinder 1 with one end connected
1 and 1 are arranged on the same axis with their other ends facing each other, and both cylinders 9 and 11 have piston parts 12 at both ends.
Each piston portion 12a of the rod 13 provided with a, 12b,
The rods 13 are connected by fitting 12b. The rod 13 is biased in one direction by a weak biasing force by springs 14a and 14b installed in the cylinders 9 and 11, respectively. Each cylinder 9, 11 has a pump port 15 which communicates with the chamber on the side of the spring biasing action.
a and 15b are provided, and tank ports 16a and 16b are provided in the chambers on the opposite sides.

The respective ports 15a, 15b, 16a and 16b of the cylinders 9 and 11 are connected to the electromagnetic directional control valve 1.
It is connected to the pilot pump 18 and the tank 19 via 7. This electromagnetic directional control valve 17 is for both pump ports 1
It has an operating position A for connecting 5a and 15b to the pilot pump 18 and a release position B for connecting both pump ports 15a and 15b to the tank 19. The release position is obtained by inputting a switching signal to the solenoid 20. B is switched against the biasing force of the spring.

Reference numeral 21 is an ultrasonic transceiver, and this ultrasonic transceiver 21 has a power shovel 22 as shown in FIG.
It is mounted toward a stop zone C, such as within the turning radius behind the, and when a worker or the like enters this stop zone, this is detected and input to the controller 23. An operating current is input to the solenoid 20 of the electromagnetic directional control valve 17 based on a signal.

In the above-mentioned structure, the electromagnetic directional control valve 17 is in the operating position A in a working state in which a signal for obstacle detection by the ultrasonic transmitter / receiver 21 is not input. , 15
Pressure oil from the pilot pump 18 acts on b, whereby the rod 13 moves to the one stroke end side of both cylinders 9 and 11, and both cylinders 9 and 11 are integrated.

Therefore, in this state, when the operation lever 6 is operated, the turning operation valve 2 is switched and operated via the lever operation releasing device 7 and the push-pull wire 8 in which both the cylinders 9 and 11 are integrated. The upper revolving structure is to the right,
Alternatively, it is turned to the left.

During the turning operation, for example, the ultrasonic transmitter / receiver 2 detects that there is an obstacle in the stop zone C as shown in FIG.
1 detects that the electromagnetic directional control valve 17 is in the release position B, and the pump ports 15a, 15 at the lever operation release position 7
b is communicated with the tank 19.

Thus, both cylinders 9 and 11 and rod 1
The connection with 3 is released. Both cylinders 9 and 11 are urged against the rod 13 by springs 14a and 14b having weak urging force, but this urging force is weaker than the spring force for returning the turning operation valve 2 to the neutral position. There is. Therefore, the turning operation valve 2 is returned to the neutral position regardless of the operation angle of the operation lever 6, the upper turning body stops at that position, and further turning is prevented, and safety against obstacles is secured.

In the above embodiment, the example of the turning operation valve 2 is shown. However, when it is applied to a plurality of operation valves, as shown in FIG. 4, the operation valves 2a and 2b and the operation lever are shown. Electromagnetic directional control valve 17 in which lever operation releasing devices 7a, 7b are interposed between 6a, 6b, and each lever operation releasing device 7a, 7b is connected to pilot pump 18 in series.
It is controlled by a and 17b.

5, 6 and 7 show an example of the mounting position of the ultrasonic transmitter / receiver 21 in the power shovel, which is mounted at the positions indicated by a, b and c in the drawings. In addition, a,
b and c show groups.

In the above embodiment, the operation releasing device 7 is constituted by the two cylinders 9 and 11 and the rod 13, but as shown in FIG. ON / OFF control may be performed to turn it off when an obstacle is detected, and the operation system connected to the operation lever 6 may be in a free state.

FIG. 9 shows another construction of the operation canceling device 7 shown in FIG. 2. One piston 26 is fitted in one cylinder 25, and free pistons are provided on both sides of this piston 26. 27a and 17b are slidably fitted to the piston 26 side by spring biasing with a weak biasing force. Further, the pump ports 28a and 28b are opposed to the back sides of the free pistons 27a and 27b, and the tank port 2 is provided between the opposed sides of the free pistons 27a and 27b.
9 are facing each other. The cylinder 25 is connected to the operation valve side, and the rod 25a of the piston 25 is connected to the operation lever side.

Also in this configuration, both pump ports 28
By supplying pressure oil from a and 28b, the cylinder 2
5 and the piston 26 are integrally connected, and both pump ports 28a and 28b are communicated with the tank side,
The cylinder 25 and the piston 26 are in a free state, and the operation valve is automatically returned to neutral.

[0020]

As described above, according to the present invention, the working machine can be operated even when the blind spot of the operator is at risk in the working range, or when the operator can see the operator's blind spot and do not notice it. It can be stopped automatically and the safety of industrial machinery can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a lever operation canceling device.

FIG. 3 is an explanatory diagram showing a stop zone of the power shovel.

FIG. 4 is a circuit diagram showing another example of the present invention.

FIG. 5 is a plan view showing an example of a mounting position of an ultrasonic transceiver in a power shovel.

FIG. 6 is a side view showing an example of a mounting position of an ultrasonic transceiver in a power shovel.

FIG. 7 is a front view showing an example of a mounting position of an ultrasonic transceiver in a power shovel.

FIG. 8 is a perspective view showing another embodiment of the lever operation canceling device.

FIG. 9 is a cross-sectional view showing another embodiment of the cylinder type lever operation releasing device.

[Explanation of symbols]

1 ... Main operation valve, 2 ... Swing operation valve, 2a ... Actuating rod, 2
b, 2c ... Operation valve, 3 ... Main pump, 4 ... Rotation motor, 5a, 5b, 14a, 14b ... Spring, 6 ... Operation lever, 7 ... Lever deactivating device, 8 ... Push-pull wire, 9, 11, 25 … Cylinder, 10… Link, 12
a, 12b ... piston part, 13, 25a ... rod, 15
a, 15b, 28a, 28b ... Pump port, 16a,
16b, 29 ... Tank port, 17 ... Electromagnetic switching valve, 18
... Pilot pump, 19 ... Tank, 20 ... Solenoid, 21 ... Ultrasonic transceiver, 22 ... Power shovel, 2
3 ... Controller, 24 ... Electromagnetic clutch, 26 ... Piston, 27a, 27b ... Free piston.

Claims (1)

[Claims] 1. A linkage for connecting an operating lever of a manually operated working machine operating valve and an operating lever 6 can be switched between an integral state and a free state in a telescopic direction by turning on or off an input of hydraulic pressure or electricity. And a control unit controlled by a controller 23 for processing a signal from the danger detecting unit. Operating device.