JP2569841Y2 - Operating device of hydraulic working machine - Google Patents

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 hydraulic working machine, and more particularly to an operating device for a four-way three-position hydraulic switching valve for controlling the driving of the hydraulic working machine.

[0002]

2. Description of the Related Art As hydraulic working machines, mobile cranes,
Truck mounted cranes, aerial work vehicles, and the like are known. The hydraulic working machine of this type is driven by a hydraulic cylinder or a hydraulic motor, and these hydraulic cylinders or the hydraulic motor are controlled by four-way three-position hydraulic switching valves. .
By the way, the operation of these hydraulic switching valves is controlled by an operating lever interlockingly connected to the hydraulic switching valve, a remote operation signal generating section that can be carried by a crane operator for superimposing and transmitting operation signals on radio waves, and the hydraulic switching valve. A hydraulic actuator for driving a switching valve interlocked with a servo valve for controlling the drive of the hydraulic actuator, and an operation signal from the remote operation signal generating unit, and a control signal to the servo valve in response to the received operation signal. And an operation processing unit that outputs the data.The operation device is configured to be able to be operated by both the remote operation signal generation unit and the remote operation signal generation unit when the remote operation signal generation unit is not used. In recent years, a storage unit provided with a storage unit has been frequently used.
When operating the hydraulic working machine at a position close to the hydraulic working machine, the operation lever is used.When operating at a position distant from the hydraulic working machine, the remote control signal generating section is provided from the storage section. It is very convenient because it can be taken out and remotely operated from this remote operation signal generator.

A conventional example of this type of operating device will be described with reference to FIG. In FIG. 2, reference numeral 1 denotes a four-way three-position hydraulic switching valve for controlling the driving of a hydraulic working machine, which is a spring center type. 2 is a hydraulic switching valve 1
An operating lever that is mechanically or hydraulically interlocked with the hydraulic lever, and that operates the hydraulic switching valve 1 from the neutral position to the forward and reverse operating positions by tilting in the forward and reverse directions from the neutral position. It is. When the hydraulic switching valve 1 is operated from the neutral position to the forward operating position, the hydraulic motor or the hydraulic cylinder A connected to the hydraulic switching valve 1 is driven in one direction, and the hydraulic switching valve 1 is moved in the reverse direction from the neutral position. Is operated, the hydraulic motor or the hydraulic cylinder A connected to the hydraulic switching valve 1 is driven in the other direction.

[0004] Reference numeral 3 denotes a remote operation signal generating section 4 that can be carried by a crane operator for transmitting an operation signal superimposed on a radio wave, a hydraulic actuator 5 for driving a switching valve interlocked with the hydraulic switching valve 1, A servo valve 6 for controlling the drive of the hydraulic actuator 5; and an arithmetic processing unit 7 for receiving an operation signal from the remote operation signal generation unit 4 and outputting a control signal to the servo valve 6 in accordance with the received operation signal. Remote control means. Reference numeral 8 denotes a feedback signal generation unit included in the arithmetic processing unit 7, which generates a signal relating to the operation amount of the hydraulic actuator 5. Reference numeral 9 denotes a storage section of the remote operation signal generation section 4 arranged at an appropriate position of the hydraulic working machine. This storage section 9
Is for accommodating the remote operation signal generation unit 4 when the hydraulic switching valve 1 is not remotely operated by the remote operation means 3 (when the hydraulic switching valve 1 is switched by the operation lever 2).

In the example shown in FIG. 2, the hydraulic actuator 5 in the remote control means 3 is constituted by a double-acting hydraulic cylinder having two opposed oil chambers. The servo valve 6 in the remote control means 3 is a pair of spring offset electromagnetically operated two-position switching valves 6a and 6b.
It consists of: The two-position switching valve 6a includes an oil passage 6c connected to one oil chamber of the hydraulic actuator 5,
It is interposed between the high-pressure oil passage 6d and the tank oil passage 6e. The oil passage 6c and the tank oil passage 6e communicate with each other at the spring offset position, and the high-pressure oil passage 6d and the oil passage 6c move from the former to the latter at the switching position. Is connected via the check valve 6f so as to allow only the supply of the hydraulic oil. The two-position switching valve 6b is interposed between an oil passage 6g, a high-pressure oil passage 6d, and a tank oil passage 6e connected to the other oil chamber of the hydraulic actuator 5, and has an oil passage at its spring offset position. 6g and the tank oil passage 6e,
At the switching position, the high-pressure oil passage 6d and the oil passage 6g are connected via a check valve 6h so as to allow only the supply of hydraulic oil from the former to the latter.

When no operation signal is input from the remote operation signal generator 4 and the arithmetic processing unit 7 does not output a control signal to the servo valve 6, the two-position switching valves 6a, 6a, Reference numeral 6b is at a spring offset position, and both oil chambers of the hydraulic actuator 5 are both connected to a tank oil passage 6e. In this state, the hydraulic switching valve 1 can be freely operated by the operation lever 2.

When an operation signal for switching the hydraulic switching valve 1 to the right is input from the remote control signal generating section 4 to the arithmetic processing section 7, a control signal for switching the two-position switching valve 6a from the arithmetic processing section 7 is provided. Is output. Two-position switching valve 6a
Is operated to the switching position, the piston of the hydraulic actuator 5 is driven to the right in the drawing, and the hydraulic switching valve 1 associated therewith is driven to switch to the right. Arithmetic processing unit 7
Compares the information on the operation amount included in the operation signal from the remote operation signal generation unit 4 with the feedback signal from the feedback signal generation unit 8 of the arithmetic processing unit 7;
When the switching amount of the hydraulic switching valve 1 reaches a position corresponding to the operation signal from the remote operation signal generator 4, a control signal for switching the two-position switching valve 6b in addition to the two-position switching valve 6a is output. As a result, the two-position switching valves 6a and 6b are both operated to the switching position, and the hydraulic actuator 5 is locked.

When an operation signal for switching the hydraulic switching valve 1 to the left from the remote control signal generating unit 4 is input to the processing unit 7, a control signal for switching the two-position switching valve 6b from the processing unit 7 is provided. Is output. Two-position switching valve 6b
Is operated to the switching position, the piston of the hydraulic actuator 5 is driven to the left in the figure, and the hydraulic switching valve 1 linked to this is driven to switch to the left. Arithmetic processing unit 7
Compares the information on the operation amount included in the operation signal from the remote operation signal generation unit 4 with the feedback signal from the feedback signal generation unit 8, and determines the amount of switching of the hydraulic switching valve 1 by the remote operation signal generation unit. When reaching the position corresponding to the operation signal from 4, the control signal for switching the two-position switching valve 6a is output in addition to the two-position switching valve 6b. As a result, the two-position switching valves 6b and 6a are both operated to the switching position, and the hydraulic actuator 5 is locked. Such a remote control means 3 is well known.

[0009]

In the operating device for a hydraulic working machine constructed as described above, while the operator is operating the operating lever 2 to drive the hydraulic working machine, another operator may erroneously operate the hydraulic working machine remotely. When the remote control signal generating section 4 of the operating means 3 is operated, there is a problem that the hydraulic switching valve 1 is operated against the intention of the operator. In order to cope with such a problem, a remote operation shut-off switch for disabling operation signal output even when the remote operation signal generating unit 4 is operated is attached to the remote operation signal generating unit 4 of the remote operation means 3. When the hydraulic switching valve 1 is to be switched via the operating lever 2, the remote control shut-off switch may be switched to a remote control disabled state. Since there is a possibility that the remote operation signal generating unit 4 may be operated after the remote operation cutoff switch is restored, the problem cannot be solved. An object of the present invention is to provide a novel hydraulic operating machine operating device that solves the above-mentioned problem.

[0010]

Means for Solving the Problems To achieve the above object, the operating device for a hydraulic working machine according to the present invention is configured as follows. (First Invention) A four-way, three-position type hydraulic switching valve 1 for controlling the driving of a hydraulic working machine, an operating lever 2 interlocked to the hydraulic switching valve 1, and an operation signal superimposed on a radio wave for transmission. A remote control signal generator 4 which can be carried by a crane operator, a hydraulic actuator 5 for driving a switching valve interlocked with the hydraulic switching valve 1, a servo valve 6 for controlling the driving of the hydraulic actuator 5 , and the remote control signal Hydraulic work configured to be operated by both the remote control means 3 including an arithmetic processing unit 7 which receives an operation signal from the generation unit 4 and outputs a control signal to the servo valve 6 according to the received operation signal. Operating device for the hydraulic machine,
When the remote operation signal generator 4 is not used, a storage unit 9 for storing the remote operation signal generator 4 is provided. In addition to interposing a valve, a storage detector for detecting that the remote control signal generation unit 4 has been stored in the storage unit 9 is attached, and a detection signal of the storage detector is input to the arithmetic processing unit 7 and the arithmetic processing unit 7 performs the calculation. The processing unit 7 outputs a signal for turning on the unload valve in the on-load state when the signal for detecting the storage of the remote operation signal generation unit 4 is input from the storage detector. In a state in which a signal for detecting the storage of the operation signal generation unit 4 is not input, a signal for turning the unload valve on-load only when an operation signal is input from the remote operation signal generation unit 4 is output. I Hydraulic working machine operation device characterized in that there. (Second Invention) A four-way three-position hydraulic switching valve 1 for controlling the driving of a hydraulic working machine is provided with an operating lever 2 interlockingly connected to the hydraulic switching valve 1, and an operation signal is superimposed on a radio wave and transmitted. A remote control signal generator 4 which can be carried by a crane operator, a hydraulic actuator 5 for driving a switching valve interlocked with the hydraulic switching valve 1, a servo valve 6 for controlling the driving of the hydraulic actuator 5 , and the remote control signal Hydraulic work configured to be operated by both the remote control means 3 including an arithmetic processing unit 7 which receives an operation signal from the generation unit 4 and outputs a control signal to the servo valve 6 according to the received operation signal. Operating device for the hydraulic machine,
When the remote operation signal generator 4 is not used, a storage unit 9 for storing the remote operation signal generator 4 is provided. In addition to interposing a valve, a storage detector for detecting that the remote operation signal generation unit 4 is stored in the storage unit 9 is attached, and the operation state of the hydraulic switching valve 1 is detected in the hydraulic switching valve 1 or the operating lever 2. Operating state detecting means to be attached, and the detection signals of the storage detector and the operating state detecting means are input to the arithmetic processing section 7 and the arithmetic processing section 7
In the state where the signal for detecting the storage of the remote operation signal generation unit is input from the storage detector, the operation state detection is performed.
Outputs a signal to turn on load state the unloading valve only when the signal for detecting the operation state of the hydraulic switching valve 1 from the means out is input, the storage of the remote control signal generator 4 from the reception detector In a state where a signal to be detected is not input, a signal for turning the unload valve into an on-load state is output only when an operation signal is input from the remote operation signal generation unit 4. Operating device for hydraulic working machine.

[0011]

In the operation device of the conventional hydraulic working machine of the present invention configured as described above, at the time of operation by the operation lever 2, in the first invention, the remote operation signal generation unit 4 is stored in the storage unit 9. Is detected, that is, when the hydraulic working machine is about to be operated by the operation lever 2, the unload valve is turned on by a signal from the arithmetic processing unit 7. In the second invention, the remote control signal generator 4
State but it is detected that has been housed in the housing portion 9, Misao
Only when the working state detecting means detects the operating state (non-neutral state) of the hydraulic switching valve 1, the unload valve is turned on by the signal from the arithmetic unit 7. That is, in the second invention, after the remote operation signal generation unit 4 is stored in the storage unit 9 and the operation lever 2 is operated from the neutral position, the unload valve is in the on-load state only. In the operation standby state by the lever 2, the unload valve maintains the unload state, and has an effect that the energy loss due to the return of the hydraulic oil can be further reduced. In this state, the hydraulic working machine can be operated by the operation lever 2. Since the remote operation signal generation unit 4 is stored in the storage unit and the operation of the remote operation signal generation unit 4 is disabled, the operator operates the operation lever 2 to drive the hydraulic working machine. This prevents another operator from erroneously switching the remote control means 3. At the time of operation by the remote operation means 3 When the hydraulic working machine is operated by the remote operation means 3, first, the remote operation signal generation section 4 is taken out of the storage section 9. Then, the storage detector detects that the remote operation signal generation unit 4 is not stored in the storage unit 9, and this detection signal enters the arithmetic processing unit 7. In this state, when the operation signal is input from the remote operation signal generation unit 4, the arithmetic processing unit 7 sets the unload valve to the on-load state. For this reason, the operation of the hydraulic working machine using the remote control means 3 becomes possible in the same manner as the conventional one.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the operating device for a hydraulic working machine according to the present invention will be described below with reference to FIG. Since the present invention is obtained by adding a part of the configuration to the conventional one, the reference numerals used in the description of the above-described prior art are used as the same in the following description.

(First Invention) In FIG. 1, reference numeral 10 denotes an electromagnetically operated unload valve interposed between a pressure oil supply circuit 1a for the hydraulic switching valve 1 and a tank. In this example, the unload valve 10 is configured to be in the on-load state when the solenoid 10a is energized, and to be in the unloaded state when the solenoid 10a is not energized. 10b is a switch interposed between the solenoid 10a and a power supply.

Reference numeral 11 denotes a storage detector attached to the storage unit 9, which detects a state in which the remote control signal generation unit 4 is stored in the storage unit 9 and inputs the detection signal to the arithmetic processing unit 7. Make up.

The arithmetic processing unit 7 includes the storage detector 11
When a signal for detecting the storage of the remote operation signal generation unit 4 is input from the controller, a signal for setting the switch 10b to the connected state is output. Therefore, when the remote control signal generation unit 4 is stored in the storage unit 9, the switch 10 b is connected, the unload valve 10 is turned on, and the operation lever 2 operates the hydraulic switching valve 1.
Can be operated to drive the hydraulic working machine . In this state, since the remote operation signal generation unit 4 is stored in the storage unit 9, the operation signal cannot be output from the remote operation signal generation unit 4 . The driving state is not obstructed by the remote control means 3.

The arithmetic processing unit 7 takes out the remote control signal generating unit 4 from the storage unit 9 and
In the state in which the hydraulic working machine is being driven by the operation signal from, that is, in the state where the signal for detecting the storage of the remote operation signal generation unit 4 from the storage detector 11 is not input to the arithmetic processing unit 7, Only when an operation signal is input from the remote operation signal generator 4 (when the operator operates the remote operation signal generator 4), a signal for turning on the switch 10b is output.

For this reason, in a state where the remote control signal generating section 4 is taken out of the storage section 9, the hydraulic working machine can be driven by operating the remote control signal generating section 4. In addition,
When the remote control signal generator 4 is not operated with the remote control signal generator 4 taken out of the storage unit 9 for remote control of the hydraulic working machine (the operation signal is input to the arithmetic processing unit 7). If no), the unloading valve 10 is in the unloaded state, so that even if the hydraulic switching valve 1 is operated by the operating lever 2, the hydraulic working machine is not driven, so that it is safe. (Second Device) In the above embodiment, when the storage detector 11 detects that the remote operation signal generation unit 4 is stored in the storage unit 9, the unload valve 10 is turned on in response to this detection. However, in the second invention, in addition to the above embodiment, an operation state detecting means (not shown) for detecting the operation state of the hydraulic switching valve is attached to the hydraulic switching valve or the operating lever.
The detection signal of the operation state detecting means is input to the arithmetic processing unit 7, and the storage detector 1 is input to the arithmetic processing unit 7.
In the state where the signal for detecting the storage of the remote operation signal generation unit 4 is input from 1, the unload valve is turned on only when the signal for detecting the operation state of the hydraulic switching valve is input from the operation state detection means. It is configured to output a signal for loading. With such a configuration, the unload valve maintains the unload state in the operation standby state by the operation lever 2 and has an additional effect that the energy loss due to the return of the hydraulic oil can be further reduced. As the operation state detecting means , the hydraulic switching valve 1 is operated in the operation processing section 7 based on a feedback signal input from the feedback signal generation section 8 of the remote operation means 3 to the arithmetic processing section 7 (non-operating state). It may be detected that the operation is being performed in the neutral state. Further, a limit switch (not shown) associated with the operation lever 2 may be used.

[0018]

The operating device for a hydraulic working machine according to the present invention, which is constructed and operates as described above, requires that the remote control signal generating section 4 is not stored in the storing section 9 in which the remote control signal generating section 4 cannot be operated. The operator cannot operate the hydraulic working machine with the operating lever 2, and when the operator operates the operating lever 2 to operate the hydraulic switching valve 1, another operator can use the remote operation signal generating unit 4 to operate the hydraulic operating machine. Hydraulic switching valve 1
The situation of manipulating is completely avoided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of the operating device of the hydraulic working machine of the present invention.

FIG. 2 is an explanatory view of a conventional operating device of a hydraulic working machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic switching valve 2 Operation lever 3 Remote control means 4 Remote control signal generation part 5 Hydraulic actuator 6 Servo valve 7 Operation processing part 8 Feedback signal generation part 9 Storage part 10 Unload valve 10a Solenoid 10b Switch 11 Storage detector

Claims (2)

(57) [Scope of request for utility model registration] An operation lever interlockingly connected to a four-way three-position type hydraulic switching valve for controlling the driving of a hydraulic working machine, a crane operator for transmitting an operation signal by superimposing an operation signal on a radio wave. A portable remote control signal generating unit, a hydraulic actuator for driving a switching valve interlocked with the hydraulic switching valve, a servo valve for controlling the driving of the hydraulic actuator, and receiving an operation signal from the remote control signal generating unit; And a remote control means comprising a processing unit for outputting a control signal to the servo valve in response to the received operation signal. A storage unit for storing the remote operation signal generation unit when the remote operation signal generation unit is not used, wherein a pressure oil supply circuit to the hydraulic switching valve and a tank are provided. And a storage detector for detecting that the remote control signal generation unit is stored in the storage unit, and the detection signal of the storage detector is calculated by the arithmetic processing unit. The arithmetic processing unit outputs a signal for turning the unload valve into an on-load state when a signal for detecting storage of the remote operation signal generation unit is input from the storage detector, In the state where the signal for detecting the storage of the remote operation signal generation unit is not input from the storage detector, a signal for turning the unload valve into the on-load state is output only when the operation signal is input from the remote operation signal generation unit. An operating device for a hydraulic working machine, wherein the operating device is configured to perform the following operations. 2. A four-way three-position type hydraulic switching valve for controlling the driving of a hydraulic working machine, an operating lever interlockingly connected to the hydraulic switching valve, and a crane operator for transmitting an operating signal superimposed on a radio wave. A portable remote control signal generating unit, a hydraulic actuator for driving a switching valve interlocked with the hydraulic switching valve, a servo valve for controlling the driving of the hydraulic actuator, and receiving an operation signal from the remote control signal generating unit; And a remote control means comprising a processing unit for outputting a control signal to the servo valve in response to the received operation signal. A storage unit for storing the remote operation signal generation unit when the remote operation signal generation unit is not used, wherein a pressure oil supply circuit to the hydraulic switching valve and a tank are provided. An electromagnetically operated unload valve is interposed between the housings, and a storage detector for detecting that the remote control signal generation unit has been stored is attached to the storage unit. Attach operation state detection means to detect the operation state ,
The detection signals of the storage detector and the operation state detecting means are input to the arithmetic processing unit, and the arithmetic processing unit is configured to input a signal for detecting storage of the remote operation signal generation unit from the storage detector. Outputting a signal for turning on the unload valve only when a signal for detecting the operation state of the hydraulic pressure switching valve is input from the operation state detection means , and remote from the storage detector. In the state where the signal for detecting the storage of the operation signal generation unit is not input, the signal for turning on the unload valve is output only when the operation signal is input from the remote operation signal generation unit. An operating device for a hydraulic working machine, comprising: