KR20030087908A - Hydraulic controller - Google Patents

Abstract

Even when manual operation and remote operation are operated at the same time, a hydraulic control apparatus is provided in which one operation is prioritized and the actuator is not operated by the other operation.

The direct pressure reducing valve devices 50a to operated by the remote control means 7 and the source pressure supplied to the pressure reducing valves 33a to 33d of the hydraulic pressure reducing valve device 3 controlled by the operation lever 31 by manual operation. The source pressure supplied to 50d) is supplied to only one device by the switching valves 22, 23, and 15.

Description

Hydraulic control device {HYDRAULIC CONTROLLER}

The present invention relates to a hydraulic control device which is controlled by manual operation or remote operation and supplies pilot pressure oil to an actuator.

Since manual and remote operation are selectively performed by the operator, the operation control for the actuator is performed, but the hydraulic device is performed. That is, in a normal working environment, when the operator controls the operation of the actuator by manual operation from the cab of the device equipped with the actuator, for example, when the work must be performed in a hazardous area or in a dangerous environment, the operator moves from a position away from the cab. The operation of the actuator is controlled by remote operation. As the remote operation, a wireless communication means or a wired communication means is used, and operation control of the actuator can be performed by remote operation from the outside of the apparatus equipped with the actuator.

As a pilot pressure output device capable of performing manual operation and remote operation, Japanese Patent Application Laid-Open No. 2000-340612 to the present applicant is proposed. The hydraulic circuit diagram of the pilot pressure output device proposed in the application will be described with reference to FIG.

In FIG. 3, the operation lever 31 has shown the state in neutral position. As the operation lever 31, an operation lever 31 as shown in FIG. 4 is used. That is, the operation lever 31 is provided in the apparatus body through the free joint 8 and the disk plate 9 so that the inclined movement in the front-rear direction and the inclined movement in the direction orthogonal to the ground is free. The lower end of the disk plate 9 comes into contact with the upper ends of the pistons 32a to 32d, and the corresponding piston is pressed down by the operation of the operation lever 31.

When the operating lever 31 in a neutral state is inclined in the counterclockwise direction in FIG. 3, the piston 32a is thrust by the inclined movement of the operating lever 31 and is displaced in the direction of arrow D in FIG. In the following description, the pressure reduction valve 33a which operates by the displacement of the piston 32a, and the electromagnetic proportional pressure reduction valve 50a which cooperate with the same pressure reduction valve 33a are demonstrated as an example. The operation of the pressure reducing valve actuated by the displacement of the pistons 32b to 32d and the electromagnetic proportional pressure reducing valve in conjunction with the same pressure reducing valve perform the same operation as that of the pressure reducing valve 33a and the electromagnetic proportional pressure reducing valve 50a. will be.

When the piston 32a is displaced in the direction of the arrow D, the opening area of the pressure reducing valve 32a is limited according to the displacement amount of the piston 32a, and the pressure of the pressure oil supplied from the pressure reducing pump 28 is reduced to output pipe 34a. ) The pressure oil output from the pressure reducing valve 33a is output to the pressure oil hydraulic part 41a of the shuttle valve 40a via the output pipe 34a.

The pressurized oil flowing into the shuttle valve 40a moves the ball 44a in the direction of arrow D, that is, the pressurized oil inlet 42a, and closes the pressurized oil inlet 42a to open the pressurized oil inlet 41a. As a result, the pilot pressure oil output from the pressure reducing valve 33a communicates with the pilot pipe line 43a, and the pilot pressure oil can be supplied to an actuator (not shown). At this time, the pressure oil inflow portion 42a and the pilot pipe line 43a are blocked.

In this way, the pilot pressure oil corresponding to the inclined movement amount of the operation lever 31 is output from the pressure reducing valve 33a. Similarly, even when the pistons 32b, 32c, and 32d are displaced in accordance with the inclination movement amount of the operating lever 31, the pilot pressure oil is output to the pilot pipes 43b, 43c and 43d, respectively, and the pilot pressure oil is supplied to an actuator (not shown). Can supply

Next, a description will be given of the case where the operator operates the remote control means 7 by remote operation from the outside instead of operating the operation lever 31.

In FIG. 3, the electric current does not flow in each solenoid coil 54a-d of the electromagnetic proportional pressure reducing valves 50a-50d. In this state, the remote control means 7 is operated to transmit the command value of the current flowing through the solenoid coil 54a. The controller 6 having received the command value flows a current according to the command value to the solenoid coil 54a, restricts the opening area of the pressure reducing valve 53a, and reduces the pressure of the hydraulic oil supplied from the hydraulic pump 28. Output to the output line 52a. The pilot pressure oil output from the pressure reducing valve 53a is output to the pressure oil inflow portion 42a of the shuttle valve 40a through the output pipe line 52a.

The pilot pressure oil flowing into the shuttle valve 40a moves the ball 44a in the direction of the arrow U, that is, the pressure oil inlet 41a, and closes the pressure oil inlet 42a to close the pressure oil inlet 42a. Thereby, the pilot pressure oil output from the pressure reduction valve 53a communicates with the pilot pipe line 43a, and it is possible to supply the pilot pressure oil to an actuator (not shown). At this time, the pressure oil inflow portion 41a and the pilot pipe line 43a are broken.

In this way, the pilot pressure oil corresponding to the command value of the remote control means 7 is output from the pressure reducing valve 53a. Similarly, even when current flows in the solenoid coils 54b, 54c, and 54d according to the command value of the remote control means 7, pilot pressure oil is output to the pilot pipe lines 43b, 43c, and 43d, respectively, and pilot pressure oil is supplied to the actuator (not shown). Can be supplied.

The shuttle valves 40a to d connect the pilot pressure oil on the high pressure side between the pressure of the pilot pressure oil introduced into the pressure oil inflow portions 41a to d and the pressure of the pilot pressure oil introduced to the pressure oil inflow portions 42a to d into the pilot pipe ( Output to 43a ~ d). For this reason, the pilot pressure oil output from the pressure reduction valves operated among the pressure reduction valves 33a-d or the pressure reduction valves 53a-d is output to a pilot pipe line.

The above-described Japanese Patent Application No. 2000-340612 filed by the present applicant enables the actuator to be operated from both manual operation and remote operation. Since the pilot pressure oil on the high pressure side is supplied to the actuator by the shuttle valves 40a to d, only the pilot pressure output from the operated pressure reducing valve can be output to the pilot pipe lines 43a to d. Thereby, stability by manual operation and remote operation is ensured, and operation from both manual operation and remote operation is possible.

Considering common sense, it is not possible to think of using such a method without performing the remote operation when the manual operation is being performed or the manual operation when the remote operation is being performed. .

However, as there are exceptions to the world, one can consider doing a strange use away from the usual one. In other words, it is possible to consider the use situation that the actuator may be operated by manual operation and remote operation at the same time. For such exceptionally considered cases, it is thought that it is necessary to add more stability so that manual operation and remote operation are not performed at the same time, and it is an object of the present invention to achieve this.

1 is a hydraulic circuit diagram of the first embodiment.

2 is a hydraulic circuit diagram of a second embodiment.

3 is a hydraulic circuit diagram of a source application by the applicant of the present application.

4 is a schematic view of the operation lever.

(Explanation of symbols for the main parts of the drawing)

One … Hydraulic control unit 3. Hydraulic Pressure Reducing Valve Device

5…. Electromagnetic proportional pressure reducing device 6. controller

7. Remote control means 8. Free Joint

9. Disk plate 10... Tank

15... Switching valve 16. Solenoid coil

21. Hydraulic pump 22. Switching valve

23. Solenoid coil 25... Hydraulic pump

26. Switching valve 27.. Solenoid coil

28. Hydraulic pump 31. Operation lever

32a to d. Piston 33a to d. Pressure Reducing Valve

34a-d. Output pipe 35. Supply line

36. Drain pipe 40a to d. Shuttle Valve

41a-d. Pressure oil inflow portion 42a to d. Pressure oil inlet

43a-d. Pilot pipes 44a to d. ball

50a-d. Electromagnetic proportional pressure reducing device 51a to d. Drain line

52a-d. Output pipe 53a ~ d. Pressure Reducing Valve

54a-d. Solenoid coil

In the present invention, the actuator can be operated from both manual operation and remote operation, and even when manual operation and remote operation are operated simultaneously, one operation is given priority so that the other actuator does not operate. It is to provide a hydraulic control device.

The said subject is achieved by the invention which concerns on each claim of this application provided with the following matters effectively.

That is, the invention according to claim 1 is a hydraulic control device for outputting pressure oil by manual operation and remote operation, comprising: a first pressure reducing valve operated by manual operation, a second pressure reducing valve operated by remote operation, A pressure reducing control device comprising a supply means for selectively supplying a source pressure to a first pressure reducing valve and a second pressure reducing valve.

In the present invention, the first pressure reducing valve and the second pressure reducing valve are simultaneously provided by providing supply means for selectively supplying the source pressure to the first pressure reducing valve operated by manual operation and the second pressure reducing valve operated by remote operation. Even if operated, only the pressure reducing valve supplied with the source pressure can output the pilot pressure oil. This ensures stability in the case where manual operation and remote operation are operated simultaneously.

As the supply means, various types of supply means can be used as long as the supply means can selectively supply the source pressure supplied from the hydraulic pump or the like to the first pressure reducing valve and the second pressure reducing valve. The source pressure supplied to the first pressure reducing valve or the second pressure reducing valve may be supplied to the first pressure reducing valve and the second pressure reducing valve directly or from the hydraulic pump through the filter. The pressure oil output from the other pressure reducing valve may be supplied as a source pressure with another pressure reducing valve interposed therebetween.

According to a second aspect of the present invention, there is provided a pressure reducing control device according to claim 1, wherein the supply means comprises a switching valve for switching the supply of the source pressure to the first and second pressure reducing valves. .

In this invention, the source pressure supplied from the hydraulic pump etc. can be selectively supplied with respect to a 1st pressure reducing valve or a 2nd pressure reducing valve by switching a switching valve.

According to a third aspect of the present invention, there is provided a pressure reducing control device characterized in that, in addition to the matters of claim 1, independent source pressures are respectively supplied to the first pressure reducing valve and the second pressure reducing valve.

In this invention, the original pressure supplied from the independent hydraulic pump etc. is supplied to the 1st pressure reduction valve and the 2nd pressure reduction valve, respectively. For this reason, the source pressure supplied to each of the first pressure reducing valve and the second pressure reducing valve is independent of each other, and the source pressure can be supplied only to the pressure reducing valve to be operated.

The invention according to claim 4 is, in addition to the matters of claim 3, when the supply means supplies a source pressure to one of the first pressure reducing valve and the second pressure reducing valve, the pressure supply to the other pressure reducing valve The pressure reduction control device characterized in that it comprises a means for blocking the.

In the present invention, the pilot pressure oil can be output only from the operated pressure reducing valve by operating either the first pressure reducing valve or the second pressure reducing valve. The supply of the original pressure can be cut off for the pressure reducing valve not being operated. The means for interrupting the supply of the primary pressure can be constituted by allowing the switching valve to be sandwiched between the source of pressure supply such as a hydraulic pump and the pressure reducing valve, respectively.

According to a fifth aspect of the present invention, in addition to the matters of claims 1 to 4, the first pressure reducing valve is a hydraulic pressure reducing valve.

In this invention, since the pressure reduction valve to be operated manually is limited, a well-known pressure reduction valve which can drive a pressure reduction valve by manual operation, such as a sequence valve and a proportional pressure reduction valve, can be used as a hydraulic pressure reduction valve.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described concretely based on an accompanying drawing. The present invention can be effectively applied as a hydraulic control device for various actuators used in construction machinery such as hydraulic excavators, civil machines such as bulldozers, wheel loaders, and the like. In particular, the operator can get into the cab of a construction machine, a civil engineering machine, etc., and can operate from both sides about the operation of various actuators by manual operation and the operation of the actuator by remote operation from the outside of the machine. It can be effectively applied as a hydraulic control device. Moreover, the pilot pressure oil supplied from the hydraulic control apparatus of this invention is not limited to what is supplied to the actuator in a construction machine or a civil engineering machine, For example, if it is an actuator drive-controlled by the pilot pressure oil supplied from a hydraulic control apparatus, it is applicable. will be. The electromagnetic proportional pressure reducing valve device, the hydraulic pressure reducing valve device in the hydraulic control device, and the arrangement of the flow path in the hydraulic control device are not limited to the preferred embodiments described below, and those skilled in the art can easily Naturally, the applicable technical scope is also included.

Fig. 1 shows a hydraulic oil pressure circuit diagram of the hydraulic control device 1 according to the first embodiment of the present invention. In Fig. 1, the hydraulic pressure reducing valve device 3, which is a first pressure reducing valve that is operated in accordance with the inclined movement amount of the operating lever 31, the manual operating lever 31, which is operated manually when surrounded by the double-dot chain line, and the remote operation. The electromagnetic proportional pressure reducing valve devices 50a to 50d controlled by the controller 6 based on the command value from the means 7, the output pressure from the hydraulic pressure reducing valve device 3 and the electromagnetic proportional pressure reducing valve device 50a. Shuttle valves 40a to 40d which output the output pressure on the high pressure side among the output pressures from ˜50d) are provided. Each member arrange | positioned in the middle surrounded by these double-stranded chains can be formed as an integral structure. In addition, the hydraulic circuit diagram in the part enclosed by the double-dashed line of this hydraulic control apparatus 1 is the same as the hydraulic circuit structure of the hydraulic control apparatus shown in FIG. 3, and the same code | symbol is used for the same member.

In the hydraulic circuit of FIG. 1, when the manual operation by the operation lever 31 and the remote operation by the remote operation means 7 are temporarily performed at the same time, a configuration for prioritizing one operation is provided. That is, the hydraulic pressure reducing device 3 is supplied to each of the pressure reducing valves 33a to 33d through the pressure oil pressure switching valve 22 from the hydraulic pump 21, and the drain from each of the pressure reducing valves 33a to 33d is piped ( 36 is connected to the tank 10. In addition, the oil pressure from the hydraulic pump 25 is supplied to each of the electromagnetic proportional pressure reducing valve devices 50a to 50d to each of the pressure reducing valves 53a to 53d through the switching valve 26, and each of the pressure reducing valves 53a to 53d is provided. The drain from is connected to the tank 10 by a pipe 36. In this way, the oil pressures from the two independent hydraulic pumps 21 and 25 are supplied to the hydraulic pressure reducing valve device 30 and the electromagnetic proportional pressure reducing valve devices 50a to 50d, respectively. In addition, by switching the switching valves 22 and 26, when the source pressure is supplied from one hydraulic pump, the supply of the source pressure from the other hydraulic pump can be interrupted.

Next, the operation of the hydraulic control device 1 as the first embodiment of the present invention will be described with reference to FIG.

In FIG. 1, the operation lever 31 has shown the state in neutral position. As the jaw lever 31, an operation lever 31 as shown in FIG. 4 is used. That is, the operation lever 31 is provided in the apparatus main body through the free joint 8 and the disc plate 9 so that the inclination movement in the front-back direction and the inclination movement in the direction orthogonal to the ground is free. The upper ends of the pistons 32a to 32d come into contact with the lower surface of the disk plate 9, and the corresponding pistons 32a to 32d are pushed downward by the inclined movement of the operating lever 31. When the pistons 32a to 32d are pushed down, the pressure reducing valves 33a to 33d arranged in correspondence with the respective pistons 32a to 32d operate.

At present, manual operation by the operation lever 31 is assumed to be performed by the operator. At this time, it is necessary to prevent the pilot pressure oil from being output from the electromagnetic proportional pressure reducing valve devices 50a to 50d by the remote operation by the remote operation means 7. For this reason, in the first embodiment, the hydraulic pressure from the hydraulic pump 25 for supplying the original pressure to the electromagnetic proportional pressure reducing valve devices 50a to 50d is switched by the switching valve 26, and the hydraulic pressure from the hydraulic pump 25 is reduced. The oil pressure is cut off so that it is not supplied to the electromagnetic proportional pressure reducing device 50a to 50d. The control command to the solenoid coil 27 in the selector valve 26 is issued by an instruction command by an operator in the cab for manual operation. The control device issues an instruction command or the like based on a detection signal from the detector or a detection signal confirming the opening / closing of the door of the entrance into the cab by the operator or the lock fund operation. It is possible to use a variety of well-known means by issuing a switching instruction to the solenoid coil 27 of the selector valve 26, so that safety confirmation can be performed, and the pressure oil from the hydraulic pump 25 It is possible to control the switching valve 26 for a supply that is not supplied to the proportional pressure reducing valve devices 50a to 50d.

In this way, the pressurized oil from the hydraulic pump 21 is supplied to the hydraulic pressure reducing valve device 30, and the pressurized oil from the hydraulic pump 25 is cut off by the switching valve 26 so that the electromagnetic proportional pressure reducing valve device 50a is provided. 50d) is not supplied. At this time, if the operating lever 31 in a neutral state is inclined in the counterclockwise direction in FIG. 1, the piston 32a is thrust by the inclined movement of the operating lever 31 and is displaced in the direction of arrow D in the figure. do. In the following description, the pressure reducing valve 33a operating by the displacement of the piston 32a has been described as an example, but the operation of the pressure reducing valves 33b to 33d operating by the displacement of the pistons 32b to 32d is a pressure reducing valve. The operation is performed similarly to (33a).

When the piston 32a is displaced in the direction of the arrow D, the opening area of the pressure reducing valve 33a is limited in accordance with the displacement amount of the piston 32a, and the pressure of the hydraulic oil supplied from the hydraulic pump 21 is reduced to output pipe 34a. ) The pressure oil output from the pressure reducing valve 33a is output to the pressure oil inflow part 41a of the shuttle valve 40a via the output line 34a.

The pressurized oil which flowed into the shuttle valve 40a moves the ball 44a to the arrow D direction, ie, the pressurized oil inflow part 42a, and closes the pressurized oil inflow part 42a, and opens the pressurized oil inflow part 41a. As a result, the pilot pressure oil output from the pressure reducing valve 33a communicates with the pilot pipe line 43a, and the pilot pressure oil can be supplied to an actuator (not shown) by manual operation. At this time, the pressure oil inflow portion 42a and the pilot pipe line 43a are blocked.

In this way, the pilot pressure oil corresponding to the amount of tilt movement of the operation lever 31a is output from the pressure reducing valve 33a. Similarly, even when the pistons 32b, 32c, and 32d are displaced in accordance with the inclination movement of the jaw lever 31, the pilot pressure oil is output to the pilot pipe lines 43b, 43c and 43d, respectively, and the pilot pressure oil is supplied to an actuator (not shown). Can supply

Next, a description will be given of the case where the operator operates the remote control means 7 by remote operation from the outside instead of operating the operation lever 31.

At this time, it is necessary to prevent the pilot pressure oil from being output from the hydraulic pressure reducing valve device 30 by manual operation by the operation lever 31. For this reason, in the first embodiment, the hydraulic pressure from the hydraulic pump 21 for supplying the original pressure to the hydraulic pressure reducing valve device 30 is switched by the switching valve 22 so that the hydraulic pressure from the hydraulic pump 21 is hydraulic. It is cut off so that it may not be supplied to the pressure reduction valve apparatus 30.

The operation command for interrupting the supply to the solenoid coil 23 in the selector valve 22 causes an alarm in the cab via the controller 6 to indicate that the remote operation is performed by the remote operation means 7. In addition, when a signal indicating that the presence is not detected by a detector installed in the cab to confirm the presence of an operator in the cab is transmitted from the controller 6 to the remote control means 7, the remote control means. The control command from (7) is configured to issue a command to switch the switching valve 22 to the shutoff side.

As means for detecting that no operator is present in the cab, image information by a camera installed in the cab, a belt sensor to detect that the belt is worn on the seat of the cab, and the operator in the cab perform manual operation. Various checking means for safety confirmation can be used, for example, to detect a state in which the switch is turned on. In addition, since an alarm is issued in the cab, when the operator is temporarily in the cab, attention can be paid to the operator.

In addition to the above-mentioned confirmation method, various well-known confirmation methods can be used as a safety confirmation method which makes it possible to issue a command for switching the selector valve 22.

When it is confirmed that no operator is present in the cab, the controller 6, based on the instructions from the remote control means 7, switches the shutoff and switching valve 26 of the switching valve 22 and the electromagnetic proportional pressure reducing valve device ( Control to communicate 50a to 50d is performed on the solenoid coils 23 and 26. In this way, the hydraulic oil from the hydraulic pump 25 is supplied to the electromagnetic proportional pressure reducing valve devices 50a to 50d, and the hydraulic oil from the hydraulic pump 21 is cut off by the switching valve 22 to provide the hydraulic pressure reducing valve device ( 30) is not supplied.

In FIG. 1, the electric current does not flow in each solenoid coil 54a-d of electromagnetic proportional pressure reducing valves 50a-50d. In this state, the remote control means 7 is operated to transmit the command value of the current flowing in the solenoid coil 54a. The controller 6 receiving the command value flows a current according to the command value to the solenoid coil 54a, restricts the opening area of the pressure reducing valve 53a, and reduces the pressure of the hydraulic oil supplied from the hydraulic pump 28. Output to the output line 52a. The pilot pressure oil output from the pressure reducing valve 53a is output to the pressure oil inflow part 42a of the shuttle valve 40a via the output line 52a.

The pilot pressure oil flowing into the shuttle valve 40a moves the ball 44a in the direction of arrow U, that is, the pressure oil inlet part 41a, and closes the hydraulic oil inlet part 41a to open the pressure oil inlet part 42a. As a result, the pilot pressure oil output from the pressure reducing valve 53a communicates with the pilot pipe line 43a, and the pilot pressure oil can be supplied to an actuator (not shown). At this time, the pressure oil inflow portion 41a and the pilot pipe line 43a are blocked.

In this way, the pilot pressure oil corresponding to the command value of the remote control means 7 is output from the pressure reducing valve 53a. Similarly, even when current flows in the solenoid coils 54b, 54c, and 54d according to the command value of the remote control means 7, pilot pressure oil is output to the pilot pipe lines 43b, 43c, and 43d, respectively, and pilot pressure oil is supplied to the actuator (not shown). Can be supplied.

The shuttle valves 40a to d connect the pilot pressure oil on the high pressure side between the pressure of the pilot pressure oil flowing into the hydraulic oil inflow portions 41a to d and the pressure of the pilot pressure oil flowing into the hydraulic oil inflow portions 42a to d. Output to 43a ~ d). For this reason, the pilot pressure oil output from the pressure reduction valves operated among the pressure reduction valves 33a-d or the pressure reduction valves 53a-d is output to a pilot pipe line.

As the pressure reducing valve in the hydraulic pressure reducing valve device 30, in the first embodiment, four pressure reducing valves 33a to 33d are provided, but the number of pressure reducing valves is not limited to four, and any number of pressure reducing valves is provided. Also, a plurality of hydraulic pressure reducing valve devices can be used as the valves. As the hydraulic pressure reducing valve device, a sequence valve device, an electromagnetic proportional pressure reducing device or the like can be used. For example, when the electromagnetic proportional pressure reducing valve device is used, it can be performed by controlling the amount of current flowing through the solenoid coil of the electromagnetic proportional pressure reducing valve device by manual operation. The number of electromagnetic proportional pressure reducing valve devices 50a to 50d may be set in accordance with the number of pressure reducing valves of the hydraulic pressure reducing valve device 30.

2, the second embodiment will be described using the hydraulic circuit diagram according to the second embodiment of the present invention.

In the hydraulic circuit diagram of the second embodiment, an electromagnetic switching valve is provided downstream of the hydraulic pump provided in the hydraulic circuit diagram in FIG. 3. That is, in FIG. 2, the solenoid coil 16 which switches the switching valve 15 and the copper switching valve 15 by the operation signal from the exterior is provided in the downstream of the hydraulic pump 28. As shown in FIG. By the selector valve 15, the pressure oil from the hydraulic pump passes each pressure reducing valve 33a to 33d of the hydraulic pressure reducing valve device 30 or each pressure reducing valve 53a to 53d of the electromagnetic proportional pressure reducing valve device 50a to 50d. Is supplied. Since the control after the hydraulic oil from the hydraulic pump 28 is supplied to the hydraulic pressure reducing valve device or the electromagnetic proportional pressure reducing valve devices 50a to 50d is the same as in the first embodiment, the same reference numeral is given to a member having the same function. The description is omitted.

The operation signal from the outside to the solenoid coil 16 is detected when the operator is in the cab by various detectors installed in the cab, and when the switch for manual operation by the operator from the cab is ON. The operation signal for switching the switching valve to the hydraulic pressure reducing valve device 3 side is transmitted to the solenoid coil 16. In addition, when it is detected by the various detectors installed in the cab that the operator is not in the cab, and the switch performed by the operator for manual operation from the cab is not turned on, the remote control means 7 is switched over. When the operation signal for switching the valve 15 to the electromagnetic proportional pressure reducing valves 50a to 50d is transmitted to the solenoid coil 16, the switching valve 15 is switched to the electromagnetic proportional pressure reducing valve side 50a to 50d. .

According to the first and second embodiments, when the operator operates the actuator by manual operation from the inside of the cab, it is assured that the electronic proportional pressure reducing valve devices 50a to 50d are operated by the remote operation from the remote operation means. Can be prevented.

The hydraulic control device of the present invention enables the actuator from both the manual operation and the remote operation, and even if the manual operation and the remote operation are operated at the same time, the other actuator gives priority to one operation. It is characterized by not working.

Claims (5)

Hydraulic control device which outputs pressure oil by manual operation and remote operation, A first pressure reducing valve operated by a manual operation; A second pressure reducing valve operated by a remote operation; And And a supply means for selectively supplying a source pressure to the first pressure reducing valve and the second pressure reducing valve. The pressure reduction control device according to claim 1, wherein the supply means comprises a switching valve for switching the supply of the source pressure to the first and second pressure reducing valves. 2. The pressure reduction control device according to claim 1, wherein the supply means supplies independent source pressures to the first pressure reducing valve and the second pressure reducing valve, respectively. 4. The supply means according to claim 3, wherein the supply means has a means for interrupting the supply of the original pressure to the other pressure reducing valve when the supply pressure is supplied to the pressure reducing valve of either the first pressure reducing valve or the second pressure reducing valve. Decompression control device, characterized in that made. The hydraulic control apparatus according to any one of claims 1 to 4, wherein the first pressure reducing valve is a hydraulic pressure reducing valve.