JPH0971388A - Operating device of working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operating device of a working machine devised impossible to operate the working machine unless an operating lever is once returned to a neutral position even when a gate lock lever is operated to an unlocking position. SOLUTION: Driving of an actuator is prohibited at the time when a gate lock lever 2 is operated to a lock position and an operating lever 3c is operated to an operating position. Driving of the actuator is kept prohibited even when only the gate lock lever 2 is operated to an unlocking position from this state, and driving of the actuator is allowed only as the operating lever 3c is once operated to a neutral position when the gate lock lever 2 is at the unlocking position. The actuator of a working machine is driven as the operating lever 3c is operated to the operating position in this state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating device for a work machine such as a crawler crane, a hydraulic excavator, a forklift, and the like.

[0002]

2. Description of the Related Art Some work machines such as crawler cranes are provided with a detent mechanism for holding an operation lever for operating an actuator at a certain operation position. FIG. 3 is a perspective view of a driver's seat of a working machine, for example, a crawler crane having an operation lever 3 and a gate lock lever 2 provided with the detent mechanism. FIG. 5 shows this hydraulic circuit of the prior art. As shown in FIG. 3, the gate lock lever 2 is provided at the doorway of the driver's seat, and when it is operated to a position that prevents access to the driver's seat, the gate lock lever 2 is in the unlocked position and is operated to a position that does not interfere. And the locked position. That is, the position where the gate lock lever 2 is obliquely projected as shown in FIG. 3 is the unlock position, and the position where the gate lock lever 2 is pulled up toward you to stand vertically and the doorway of the driver's seat is opened is the lock position. Is. Therefore, when the operator tries to leave the driver's seat, the gate lock lever 2 must be pulled up to the lock position.
I was unable to leave the driver's seat because I was disturbed by the gate lock lever 2. When the gate lock lever 2 is pulled up to the lock position, as shown in FIG. 5, the gate lock valve 1 that operates in conjunction with the gate lock lever 2 causes
The hydraulic pressure supply from the hydraulic pump 5 to the operation pilot valves 3a and 3b is shut off. As a result, the control valve CV is set to the neutral position regardless of the position of the operation lever 3c, and the hydraulic motor 4 is forcibly stopped.

In this way, when the operator leaves the driver's seat, the gate lock lever 2 is always operated to the lock position, and the work is forcibly stopped even if the operation lever 3 is the position to operate the work machine. . As such a device, the device disclosed in Japanese Patent Laid-Open No. 4-250230 is known.

[0004]

However, the operating lever 3
When the gate lock lever 2 is forcibly stopped by pulling up the gate lock lever 2 while keeping c in the operating position,
When the gate lock lever 2 is operated to the unlocked position, the work machine starts operating.

An object of the present invention is to prevent the work machine from being operated even if the gate lock lever is operated to the unlock position, for example, unless the operation lever is reset, that is, returned to the neutral position. To provide an operating device for the working machine.

[0006]

The present invention will be described with reference to FIGS. 1, 3 and 4 of an embodiment. In order to achieve the above object, the operating device for a working machine according to claim 1 is such that the operating member 3c is operated to an operating position for driving the actuator and a neutral position for stopping the actuator, and the operating member 3c is operated to the operating position. Operation position detecting means 7 that outputs an operation position signal when the operation member 3c is operated to a neutral position, and an unlock position and a boarding / exiting position protruding in the entry / exit path to the driver's seat. A gate lock member 2 operable to a position retracted from the path, and a lock release position signal when the gate lock member 2 is controlled to the lock release position, and when the gate lock member 2 is controlled to the lock position. The gate lock member position detecting means 6 for outputting the lock position signal and the gate lock member position detecting means 6 are reset when the lock position signal and the operation position signal are respectively output. When the motion prohibition signal is output and the lock release position signal and the neutral position signal are output respectively, it is set and the drive permission signal is output, and the lock release position signal and the operation position signal are output respectively Is a latch circuit 9 that outputs a drive prohibition signal or a drive permission signal according to the previous state, and when the drive prohibition signal is output, prohibits the actuator from driving even if the operating member 3c is operated to the operating position, The drive permission prohibition means 8 is provided for permitting the drive of the actuator when the operation member 3c is operated to the operation position while the permission signal is being output. In the work machine operating device according to the first aspect, the operator operates the operating member 3c to operate the actuator of the work machine.
The gate lock member 2 projects into the entry / exit path to the driver's seat, and the operator cannot leave the driver's seat unless the operator operates the gate lock member 2 to a position retracted from the entry / exit path. The actuator of the work machine is driven as follows depending on the combination of the states of the operation member 3c and the gate lock member 2. When the gate lock member 2 is operated in the lock position and the operation member 3c is operated in the operation position, driving of the actuator is prohibited and the operation is stopped.
When the gate lock member 2 is in the unlocked position, the operation member 3c
Although the actuator is allowed to drive when is operated to the neutral position, the actuator is stopped because the operation member 3c is operated to the neutral position. When the gate lock member 2 is in the unlocked position and the operating member 3c is in the operated position, the previous state is maintained and the driving of the actuator is prohibited or permitted, and when the driving is prohibited, the actuator is stopped. However, when the driving is permitted, the actuator is driven because the operating member 3c is operated to the operating position. The operating device for a working machine according to claim 2 is an operating member 3c operated to an operating position for driving the actuator and a neutral position for stopping the actuator.
And an operation position detecting means 7 which outputs an operation position signal when the operation member 3c is operated to the operation position, and outputs a neutral position signal when the operation member 3c is operated to the neutral position.
Driver's absence detection lock devices 6A and 10 that detect the presence of an operator in the driver's seat and output a lock release position signal, and detect the absence of an operator in the driver's seat and a lock position signal And the operation position signal are respectively output, the drive prohibition signal is output, and when the unlock position signal and the neutral position signal are respectively output, the drive permission signal is set and the drive enable signal is output. A latch circuit 9 that outputs a drive prohibition signal or a drive permission signal according to the previous state when the lock release position signal and the operation position signal are respectively output, and the operation member 3c when the drive prohibition signal is output. Prohibits the drive of the actuator even if is operated to
The drive permission prohibiting means 8 is provided for permitting the drive of the actuator when the operation member 3c is operated to the operation position while the drive permission signal is being output. In the working machine operating device according to the second aspect, the operator operates the operating member 3c to operate the actuator of the working machine. Then, the driver's seat absence detection lock devices 6A and 10 output a lock position signal when detecting that the operator is not in the driver seat,
When it detects that it is in the driver's seat, it outputs an unlock position signal. The actuator of the work machine is driven as follows by the combination of the states of the operating member 3c and the driver's seat absence detection lock devices 6A and 10. When the driver's seat absence detection lock devices 6A and 10 do not detect the operator and the operation member 3c is operated to the operation position, the driving of the actuator is prohibited and the operation is stopped. When the driver's seat absence detection lock devices 6A and 10 detect the operator and the operation member 3c is operated to the neutral position, the actuator is allowed to drive, but the actuator is operated because the operation member 3c is operated to the neutral position. Will stop. The driver's seat absence detection lock devices 6A and 10 detect the operator, and the operation member 3
When c is operated to the operation position, the previous state is maintained and the actuator drive is prohibited or permitted,
If the drive is prohibited, the actuator will stop,
When driving is permitted, the actuator is driven because the operating member 3c is operated to the operating position.

Incidentally, in the section of the means for solving the above-mentioned problems for explaining the constitution of the present invention, the drawings of the embodiments are used for the sake of easy understanding. It is not limited.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

-First Embodiment- The first embodiment will be described with reference to FIGS. 1 to 3. FIG.
Shows the electric circuit and hydraulic circuit of the first embodiment.
The same parts as those in FIG. 5 are designated by the same reference numerals, and the differences will be mainly described.

Reference numeral 6 denotes a one-circuit switch which operates in conjunction with the gate lock lever 2, and when the gate lock lever 2 is operated to the lock position, the switch 6 conducts with a contact on the "lock" side, When the gate lock lever 2 is operated to the unlocked position, the gate lock lever 2 is electrically connected to the contact on the "unlocked" side. A switch 7 is a two-circuit switch that operates in conjunction with the operation lever 3c.
When is in the operating position, it conducts with the contact on the "ON" side, and when the operating lever 3a is in the neutral position, it conducts with the contact on the "neutral" side. The operation position means an operation lever position for moving or working the work machine, and the neutral position means an operation lever position for stopping the running or the work.

Reference numeral 9 is a latch relay, and the latch relay 9 is set or reset depending on a combination of the state of the switch 6 for detecting the position of the gate lock lever 2 and the state of the switch 7 for detecting the position of the operation lever 3. To be done. When a signal is input to the SET side coil, the latch relay 9 conducts with the "set" side contact and holds this state even when the SET side coil signal is turned off. RESET
When a signal is input to the side coil, it conducts with the contact on the "reset" side, and this state is maintained even when the coil signal on the RESET side is turned off. That is, the latch relay 9 is a set / reset type latch relay. Reference numeral 8 is an electromagnetic switching valve which is switched by the output of the latch relay 9. The electromagnetic switching valve 8 is inserted in series with the gate lock valve 1 between the hydraulic pump 5 and the operation pilot valves 3a, 3b, and the output of the latch relay 9 causes the hydraulic pump 5 to operate the pilot valves 3a, 3b. Supply or shut off hydraulic pressure to.

Next, how the hydraulic motor 4 operates depending on the combination of the operation position of the gate lock lever 2 and the operation position of the operation lever 3c of the operation pilot valves 3a and 3b.
Explain whether to stop. FIG. 2 is a table in which the states of the gate lock lever 2, the gate lock lever position detection switch 6, the operation lever 3c, the operation lever position detection switch 7, the latch relay 9, the electromagnetic switching valve 8, and the hydraulic motor 4 are associated with each other. is there.

In FIG. 2, state 1 is the case where the gate lock lever 2 is operated to the unlocked position (the gate lock valve 1 is in the c position) and the operation lever 3c is operated to the neutral position. The gate lock lever position detection switch 6 is connected to the “unlock” side, the operation lever position detection switch 7 is connected to the “neutral” side, a signal is input to the SET coil side of the latch relay 9, and the latch relay 9 Set. Therefore, the electromagnetic switching valve 8 switches to the a position.
At this time, since the operating lever 3c is in the neutral position, the hydraulic motor 4 is stopped.

Next, the state 2 is the case where the operating lever 3c is moved from the state 1 to the operating position. The operation lever position detection switch 7 is connected to the "ON" side, but the gate lock lever position detection switch 6 is connected to the "unlocked" side, so that the SET side coil of the latch relay 9 also has the RES.
No signal is input to the ET coil side, and the latch relay 9 remains in the set state in the state 1. Therefore, the electromagnetic switching valve 8 holds the a position, pilot pressure oil is supplied to the control valve CV from the operation pilot valve 3a or 3b according to the operation amount of the operation lever 3c, and the pressure oil is guided to the hydraulic motor 4. Driven. When the operating lever 3c is operated to the neutral position, that is, when the operating lever 3c is returned to the state 1, the hydraulic motor 4 stops. This is the normal operating condition.

Next, with the operation lever 3c in the neutral position,
That is, when the gate lock lever 2 is operated to the lock position from the state of the state 1 (the gate lock valve 1 is at the position d), the state 3 of FIG. 2 is obtained. The gate lock lever position detection switch 6 is connected to the “lock” side, the operation lever position detection switch 7 is connected to the “neutral” side, and the latch relay 9 receives a signal on the SET coil side and the latch relay 9
Is set. When the latch relay 9 is set, an ON signal is output to the electromagnetic switching valve 8 and the electromagnetic switching valve 8 switches to the a position. At this time, since the operating lever 3 is in the neutral position, the hydraulic motor 4 does not operate. In this embodiment,
Since the circuit is connected to the SET coil of the latch relay 9 from the “neutral” side of the operation lever position detection switch 7, the latch relay 9 is set, but this circuit is not particularly necessary to configure the present invention. Good. That is, in the state 3, the signal may not be input to the latch relay 9 and the previous state may be maintained.

When the gate lock lever 2 is at the lock position and the operation lever 3c is at the operation position, the state 4 in FIG. 2 is obtained. The gate lock lever position detection switch 6 is connected to the "lock" side, the operation lever position detection switch 7 is connected to the "on" side, and the latch relay 9 is reset.
A signal is input to the coil side and reset. When the latch relay 9 is reset, the latch relay 9 causes the electromagnetic switching valve 8
An off signal is output to the solenoid valve 8, and the solenoid operated directional control valve 8 is switched to the b position. Therefore, when the gate lock lever 2 is at the lock position, the hydraulic motor 4 does not operate even if the operation lever 3c is moved to the operation position. On the other hand, when the gate lock lever 2 is in the unlocked position as in the state 2 and the operation lever 3c is operated and the hydraulic motor 4 is operating, even if the gate lock lever 2 is operated to the lock position, Since the electromagnetic switching valve 8 is switched to the b position, the working machine is forcibly stopped. In the present embodiment, when the gate lock lever 2 is in the lock position, the gate lock valve 1 is switched to the d position, and the supply of pilot hydraulic pressure is already cut off by the gate lock valve 1.

When the gate lock lever 2 is operated from this state 4 to the unlocked position, the state becomes the state 5. The gate lock lever position detection switch 6 is connected to the “unlock” side, the operation lever position detection switch 7 is connected to the “ON” side, and the SET side coil of the latch relay 9 is also connected to
No signal is input to the RESET coil side, and the latch relay 9
Holds the previous state, and the electromagnetic switching valve 8 also holds the previous state.

Here, the previous state means that the gate lock lever 2 is in the lock position and the operation lever 3c is in the operation position.
The state 4 in which the lock lever position detection switch 6 is connected to the “lock” side and the operation lever position detection switch 7 is connected to the “on” side is the state 4, the latch relay 9 is reset, and the electromagnetic switching valve 8 is in the b position (hydraulic pressure). It has been switched to (blocking). Therefore, even if the gate lock lever 2 is operated to the unlocked position in this state, the hydraulic motor 4 does not operate. In order to start the hydraulic motor 4 from this state 5, the operation lever 3c is once set to the neutral position and the latch relay 9 is set, that is, the state 1 is set and the electromagnetic switching valve 8 is switched to the a position (hydraulic pressure supply). The operation lever 3c may be operated again. This operation is the object of the present invention.

In the previous state, when the gate lock lever 2 is in the unlocked position and the operation lever is in the neutral position, that is, when the operation lever 3c is operated to the operation position in the state 1, the explanation is made in the state 2. On the street.

Thus, when the hydraulic motor 4 is stopped by pulling up the gate lock lever 2 to the lock position with the operation lever 3c in the operation position, the gate lock lever 2 is operated to the unlocked position. However, since the latch relay 9 holds the previous reset state, the hydraulic motor 4 does not operate.

The gate lock valve 1 of FIG. 1 has been conventionally used as shown in FIG. 5, and when the gate lock lever 2 is in the lock position, the hydraulic pressure is supplied in association with the gate lock lever 2. The hydraulic motor 4 is forcibly stopped regardless of the position of the operation lever 3c. As mentioned above, even without this gate lock valve 1,
Although the object of the present invention can be achieved, in the first embodiment of FIG. 1, in order to more reliably stop the operation of the hydraulic motor 4 when the gate lock lever 2 is operated to the lock position, This gate lock valve 1 is provided.

Further, the switches 6 and 7 are used for detecting the positions of the gate lock lever 2 and the operating lever 3c, and the circuits of these switches 6 and 7 and the latch relay 9 are used for the latch means. Detect the position, I
The latch means may be realized by a logic circuit such as C, or the latch means may be realized by a microprocessor and peripheral circuits. It is also possible to use a relay.

-Second Embodiment- The second embodiment will be described with reference to FIG. In the second embodiment, the gate lock lever 2 of the first embodiment is replaced with a driver seat absence detection device, the switch 6 that operates in conjunction with the gate lock lever 2 is replaced with a relay, and the gate lock valve is used. The configuration is the same as that of the first embodiment except that 1 is deleted. Therefore, the replaced part will be mainly described, and the description of other parts will be omitted. FIG. 4 shows an electric circuit and a hydraulic circuit according to the second embodiment.

Reference numeral 10 is a driver's seat absence detecting device for detecting whether or not the operator is in the driver's seat. 6A is a relay that turns on and off in response to a signal from the driver's seat absence detection device 10. The driver's seat absence detection device 10 detects when the operator is in the driver's seat and sends a signal for turning on the relay 6A to the relay 6A. When the operator turns on the relay 6A, the contact for the "unlocked" side is conducted. When the operator is not in the driver's seat, the driver's seat absence detection device 10 sends a signal to the relay 6A to turn off the relay 6A, and the relay 6A is turned off to conduct the contact on the "lock" side. Hereinafter, the operation of setting and resetting the latch relay 9 depending on the combination of the state of the relay 6A and the state of the switch 7 that detects the position of the operation lever 3 is the same as the combination of the states of the switch 6 and the switch 7 of the first embodiment. Therefore, the description is omitted.

In the present embodiment, the driver's seat absence detecting device 10 is realized by detecting the presence of an operator by detecting the body temperature of a person with a pyroelectric sensor. However, the presence of the operator may be detected by providing a switch under the driver's seat so that the switch operates when the operator sits in the driver's seat. Further, the presence of the operator may be detected by a photoelectric switch or the like. Alternatively, the presence of the operator may be detected by photographing the inside of the driver's seat with a CCD camera and performing image processing, or the presence of the operator may be detected by installing a microphone in the driver's seat.

In the above embodiment, the operating lever 3c is the operating member, the switch 7 is the operating position detecting means, the gate lock lever 2 is the gate locking member, the switch 6 is the gate locking member position detecting means, and the latch relay. Reference numeral 9 constitutes a latch circuit, electromagnetic switching valve 8 constitutes a drive permission / prohibition means, and driver's seat absence detecting device 10 and relay 6A constitute a driver's seat absence detecting lock device.

[0026]

Since the present invention is configured as described above, it has the following effects. When the gate lock member is forcibly stopped by pulling it up to the lock position while the operation member is in the operation position, the previous drive prohibition signal is not canceled by the latch circuit unless the operation member is once moved to the neutral position. Even if the gate lock member is operated to the unlocked position, it is possible to prevent the operation start of the work machine. Also, when the driver's absence detection lock device detects the absence of the operator with the operating member in the operating position and forcibly stops, similarly, unless the operating member is once moved to the neutral position, the previous drive by the latch circuit is performed. Since the prohibition signal is not canceled, the operation start of the work machine can be prevented even when the operator returns to the driver's seat.

[Brief description of drawings]

FIG. 1 is a diagram showing an electric circuit and a hydraulic circuit according to a first embodiment.

FIG. 2 is a table for explaining the operation of the first embodiment.

FIG. 3 is a perspective view of a driver's seat of the work machine.

FIG. 4 is a diagram showing an electric circuit and a hydraulic circuit according to a second embodiment.

FIG. 5 is a diagram showing a conventional hydraulic circuit.

[Explanation of symbols]

 1 Gate Lock Valve 2 Gate Lock Lever 3a, 3b Operation Pilot Valve 3c Operation Lever 4 Hydraulic Motor 5 Hydraulic Pump 6 Switch 6A Relay 7 Switch 8 Electromagnetic Changeover Valve 9 Latch Relay 10 Driver's Seat Absence Detector CV Control Valve

Claims (2)

[Claims] 1. An operating member operated to an operating position for driving an actuator and a neutral position for stopping the actuator, and an operating position signal for outputting the operating position signal when the operating member is operated to the operating position. Operating position detecting means for outputting a neutral position signal when the vehicle is operated to the neutral position, and a gate lock member operable to a lock release position projecting to the entry / exit path to the driver's seat and a lock position retracted from the entry / exit path. And a gate lock member position detection that outputs a lock release position signal when the gate lock member is operated to the lock release position, and outputs a lock position signal when the gate lock member is operated to the lock position. Means, and when the lock position signal and the operation position signal are respectively output, they are reset and a drive prohibition signal is output. When the lock release position signal and the neutral position signal are respectively output, the drive is set and a drive permission signal is output, and the lock release position signal and the operation position signal are respectively output. Is a latch circuit that outputs the drive prohibition signal or the drive permission signal according to the previous state of each position signal, and, even when the operation member is operated to the operation position when the drive prohibition signal is output, An operation of a work machine, comprising: drive permission prohibition means for inhibiting the drive of the actuator and permitting the drive of the actuator when the operation member is operated to the operation position while the drive permission signal is being output. apparatus. 2. An operating member operated to an operating position for driving an actuator and a neutral position for stopping the actuator, and an operating position signal for outputting the operating position signal when the operating member is operated to the operating position. Operating position detection means that outputs a neutral position signal when is operated to the neutral position, and an unlock position signal is output by detecting that there is an operator in the driver's seat, and it is detected that there is no operator in the driver's seat. And a driver's seat absence detection lock device for outputting a lock position signal, and when the lock position signal and the operation position signal are respectively output, a drive prohibition signal is output and the lock release position signal is output. When the neutral position signal and the neutral position signal are respectively output, they are set to output the drive permission signal, and the lock release position signal and the operation position signal are output. Is output respectively, a latch circuit that outputs the drive prohibition signal or the drive permission signal according to the previous state of each position signal, and the operation member is operated when the drive prohibition signal is output. A drive permission prohibition unit that prohibits the drive of the actuator even when the actuator is operated to the position, and permits the drive of the actuator when the operation member is operated to the operation position when the drive permission signal is output. Characteristic work machine operating device.