JPH0488202A - Directional control valve device - Google Patents

Abstract

PURPOSE:To freely change a fourth position of a main valve to a plurality of changeover functions by providing a flow passage forming member for changeably and selectively installing a pilot valve and a changeover member in the main valve composed of four main valve bodies for communication and shut-off between a feed passage, a discharge passage and a load passage. CONSTITUTION:A main valve 2 is constituted of a first - fourth valve bodies 3-6 for communicating and shutting off respectively a first, a second load passages A, B, a feed passage P and a discharge passage R leading to a rod, a head chambers 1A, 1B of a fluid actuator 1. There are also provided solenoid operated pilot valves 9, 10 for controlling pilot pressure to fluid chambers 3A-6A of main valve bodies respectively, and a first, a third, a fifth, a seventh changeover members 12, 13, 31, 36 changeably and selectively installed on a flow passage forming member 11. Since the respective changeover members 12, 13, 31, 36 are selectively installed on the flow passage forming member 11, a fourth position of the main valve 2 can be changed to a plurality of changeover functions, thus coping with a wide range of application.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a directional control valve device that operates four main valve bodies to obtain four-position switching.

[Conventional technology]

Conventionally, this type of directional control valve device has been disclosed in Japanese Patent Publication No. 214563.
The configuration is as shown in the publication, and includes a supply path that supplies pressurized fluid by operating four main valve bodies in the main valve by switching two pilot valves, and a first load path that connects to the fluid actuator. and a main valve which communicates between the second load path and a discharge path connected to the low pressure side, and a main valve which communicates between the supply path and the second load path and communicates between the discharge path and the first load path.
a second position that communicates between the supply path and the first load path and a second position that communicates between the discharge path and the second load path; and a second position that communicates between the supply path and the first load path and the second load path and a discharge path that communicates with each other. The fluid actuator is switched in the first position of the main valve, and has a fourth position where the supply path, the first load path, the second load path, and the discharge path are shut off. It operates in one direction, the second position of the main valve operates the fluid actuator in the other direction, the third position of the main valve operates the fluid actuator at high speed by the differential circuit, and the neutral position of the main valve stops the fluid actuator. The fluid actuator is provided to control the operation of the fluid actuator.

[Problem that the invention seeks to solve]

However, since such a directional control valve device exclusively has the switching function of shutting off the supply path, the first load path, the second load path, and the discharge path at the fourth position of the main valve, the fourth position of the main valve In order to accommodate applications that require pressure relief from both the first load path and the second load path, or applications that require pressure relief from either one of the load paths, a dedicated fourth position is provided. There was a problem in that a directional control valve device with a switching function had to be provided, making management work difficult.

The present invention solves this problem, and the fourth valve of the main valve
The present invention provides a directional control valve device in which the switching function can be changed depending on the position and can be used in a wide range of applications.

[Means for solving problems]

For this reason, the present invention provides a first main valve body that disconnects communication between a supply path that supplies pressure fluid and a first load path that connects to a fluid actuator, and a first main valve body that disconnects communication between a supply path that supplies pressure fluid and a first load path that connects to a fluid actuator; A second main valve body that cuts off communication between the first load path and the discharge path connected to the low pressure side, a fourth main valve body that cuts off communication between the second load path and the discharge path. A pilot supply path and one pilot load path are connected so that pilot fluid can be introduced into the fluid chambers formed at the back of the four main valve bodies and the pilot fluid in the fluid chamber can be discharged to the low pressure side. A first position where the pilot discharge passage and the other pilot load passage communicate with each other, and a second position where the pilot supply passage and the other pilot load passage communicate with each other and the pilot discharge passage and one of the pilot load passages communicate with each other. Two pilot valves that can be freely switched between the two pilot valves are provided between the main valve and the two pilot valves, and are installed between the fluid chambers on the back of the four main valve bodies and the pilot load paths of the two pilot valves. a flow path forming member forming a plurality of pilot connection paths connecting the pilot valves; By performing a switching operation, the main valve is placed in the first position, which communicates between the supply path and the second load path, and the discharge path and the first load path, and one of the pilot valves is placed in the second position, and the other is placed in the first position. By switching the main valve to a second position, the main valve communicates between the supply path and the first load path, and also communicates the discharge path and the second load path, and both pilot valves are switched to the second position. The main valve is placed in the third position constituting a differential circuit of the fluid actuator in which the main valve shuts off the discharge path and allows communication between the supply path, the first load path, and the second load path, and both pilot valves are placed in the first position. The main valves are provided in such a way that the main valves are switched to the fourth position when the pilot valve is switched between the first and second positions. a first switching member that switches the pilot connection path connected to the fluid chamber of the pilot valve into communication with one pilot load path of one pilot valve and the other pilot load path of the other pilot valve; A pilot connection path connected to the chamber and a second switching member connecting the other viroft load path of the other pilot valve are changeably selected and installed, and the first and second positions of the other pilot valve are changed. A third switching device that switches the pilot connection path connected to the fluid chamber on the back of the fourth main valve body to one pilot load path of the other pilot valve and the other pilot load path of the one pilot valve in accordance with the switching operation. and a fourth switching member that connects the pilot connection path connected to the fluid chamber on the back of the fourth main valve body to the other pilot load path of one pilot valve, and is provided by freely selecting and attaching the pilot connection path to the fluid chamber on the back of the fourth main valve body. The fourth position of the main valve can be changed to a plurality of switching functions by selectively attaching each switching member to the path forming member.

[For production]

In this configuration of the present invention, by selectively attaching the first switching member and the third switching member to the flow path forming member, the first main valve body, the second main valve body, and the third main valve body are switched at the fourth position of the main valve. body, 4th
The first switching function operates to shut off the main valve body to shut off the supply path, the first load path, the second load path, and the discharge path, and also connects the first switching member to the second switching member and the third switching member. By changing and attaching them to the fourth switching member, the first main valve body and the second main valve body are operated to shut off at the fourth position of the main valve, and the third main valve body and the fourth main valve body are closed. A second switching function that operates to communicate with each other to cut off the supply path and establish communication between the first load path, the second load path, and the discharge path also switches the third switching member to the fourth switching function without changing the first switching member. By changing the parts and attaching them, the first main valve body, the second main valve body, and the third main valve body are operated to shut off at the fourth position of the main valve, and the fourth main valve body is operated to communicate. A third switching function that cuts off the supply path and the first load path and communicates between the discharge path and the second load path also changes the first switching member to the second switching member without changing the third switching member. By installing the main valve in the fourth position, the first main valve body, the second main valve body, and the fourth main valve body are operated to shut off, and the third main valve body is operated to communicate with the supply channel. A plurality of switching functions can be obtained, including a fourth switching function that interrupts the second load path and communicates between the discharge path and the first load path. For this reason,
The switching function at the fourth position of the main valve can be changed depending on the application, making it possible to correspond to a wide range of applications.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In FIG. 1, P is a supply path for supplying pressure fluid, A is a first load path connected to the rod chamber IA on which the load of the workpiece W of the fluid actuator 1 acts, and B is connected to the head chamber IB of the fluid actuator 1. The second load path R is a discharge path connected to the low pressure side. 2 is the main valve, which connects the supply path P and the first
A first main valve body 3 that disconnects communication between the load path A, a second main valve body 4 that disconnects communication between the supply path P and the second load path B, and a communication between the first load path A and the discharge path 2. A third main valve body 5 that blocks the communication, a fourth main valve body 6 that blocks communication between the second load path B and the discharge path 2, and a valve formed on the back of each main valve body to introduce pilot fluid or discharge the pilot fluid. Fluid chambers 3A, 4A,
Equipped with 5A and 6A. The first main valve body 3 is provided in a poppet shape and has a piston portion at the head so that the pressure fluid in the supply path P acts in equilibrium, forming a first action chamber 3B. A second action chamber 3C is formed into which fluid from the load path A is introduced, and a spring 3D whose spring force is adjustable is housed in the fluid chamber 3A at the back so as to bias the first main valve body 3 in the shutoff direction. are doing.

The second main valve body 4 is provided in a poppet shape and has a piston portion at the head so that the pressure fluid in the supply path P acts in equilibrium, forming a first action chamber 4B, and a second fluid chamber 4A at the back. Main valve body 4
A spring 4D is installed to bias the switch in the blocking direction. The third main valve body 5 and the fourth main valve body 6 are provided in a poppet shape,
The back fluid chambers 5A and 6A house springs 5D and 6D to bias each main valve body 5.6 in the blocking direction, and
Adjustment members 5E and 6E are provided to freely adjust the opening degree of each main valve body 5.6 in the communication direction. 3F, 4F, 5F.

6F is a pilot path connected to the fluid chambers 3A, 4A, and 5A15A, 3J and 4J are pilot paths connected to the first action chamber 3B14B, 7 is a pilot discharge flow path connected to the low pressure side, and 8 is connected to the supply path P. Each main valve 2 is equipped with a pilot supply flow path. 9.10 are two electromagnetically operated pilot valves, including pilot supply paths 9P and 10P that supply pilot fluid, a pilot discharge path 9R1IOR that discharges pilot fluid to the low pressure side, and two pilot load paths 9A, IOA and gB. , is equipped with IOB. And the pilot valve 9.10 is the pilot supply path 9.
P, a first position 9C110C that is a neutral position in a non-energized state that communicates between the IOP and the pilot load paths 9A and 10A, and also communicates between the pilot discharge path 9R110R and the pilot load path 9B and IOB, and a pilot supply path 9P,
A second position 9D1 in an energized state that communicates between the IOP and the pilot load path 9B1 and the IOB, and also communicates between the pilot discharge path 9R and IOR and the pilot load path 9A and IOA.
10D, which can be freely switched. Reference numeral 11 denotes a flow path forming member interposed between the main valve 2 and the two pilot valves 9 and 10, and a plurality of pilot connection paths, which will be described in detail later, are formed inside. Reference numeral 12 denotes a first switching member which is selectively and selectively attached to the flow path forming member 11;
A is connected to the pilot load path 9B of the pilot valve 9 via the pilot connection path 13.14.15, and the pilot path 5F of the third main valve body 5 is connected at the first position 9C of the pilot valve 9 to the pilot load path 9B of the pilot valve 9.
The pilot connection path 16 connected to the pilot connection path 17
．． Pilot load path 9A of pilot valve 9 via 18
At the same time, the second position 9D of the pilot valve 9
Connect pilot connection path 16 to pilot connection path 19.20.
, 21 and 22, the pilot load path 10B of the pilot valve 1o is switched to communicate with the pilot load path 10B. Reference numeral 13 denotes a third switching member which is selectively and selectively attached to the flow path forming member 11, and connects the pilot operation path 13A to the pilot connection path 23.
24.22 to the pilot load path 10B of the pilot valve 10, and the first position 10C of the pilot valve 10
When the pilot connection path 25 connected to the pilot path 6F of the fourth main valve body 6 is switched to the pilot load path 10A of the pilot valve 10 via the pilot connection path 26.27, the second position of the high-lot valve 1o is reached. 10D to pilot connection path 25 to pilot connection path 28.29.30.1
5, the pilot load path 9B of the pilot valve 9 is switched to communicate with the pilot load path 9B. Then, the first switching member 12
and the third switching member 13 have the same internal structure. 3
1 is a fifth member selectively attached to the flow path forming member 11 in a changeable manner.
The switching member connects the pilot operating path 31A to the pilot load path 10B of the high rotary valve 1o via the pilot connection path 32.24.22, and connects the pilot operating path 31A to the pilot load path 10B of the pilot valve 1o at the first position 10C of the pilot valve 1o. The pilot connection path 33 connected to the pilot connection path 34.27 is switched to the pilot load path 10A of the pilot valve 1o via the pilot connection path 34.27, and the pilot connection path 33 is connected to the pilot connection path 35.27 at the second position 10D of the pilot valve 10. 29.
30 and 15, the pilot load path 9B of the pilot valve 9 is switched to communicate with the pilot load path 9B. Reference numeral 36 denotes a seventh switching member that is selectively and selectively attached to the flow path forming member 11, and connects the pilot connection path 37 connected to the pilot path 4F of the second main valve body 4 to the pilot valve 9 via the pilot connection path 38.18. The pilot load path 9A is connected to the pilot load path 9A. 38A is a pilot connection path that branches from the pilot connection path 21 and connects to the pilot path 3J of the first main valve body 3; 39 is a pilot connection path that branches from the pilot connection path 30 and connects to the pilot path 4J of the second main valve body 4. Pilot connection path, 4
0 is a pilot connection path connecting the pilot supply path 8 of the main valve 2 to the pilot supply path 9P of the pilot valve 9;
1 is branched from the pilot connection path 40 and connected to the pilot valve 1
0 is a pilot connection path connected to the pilot supply path 10P, 42.43 is a continuation path, and 44.45 is a pilot connection path 4.
2, the pilot discharge passage 10 of the pilot valve 10
This is a pilot connection path that connects to R.

Next, the operation of this configuration will be explained.

A part of the pressure fluid supplied to P flows as a pilot fluid from the pilot supply passage 8 and the pilot connection passage 40 to the pilot supply passage 9P of the pilot valve 9, and also passes through the pilot connection passage 41 to the pilot supply passage of the pilot valve 10. 10P, and the pilot fluid that has flowed into the pilot supply path 9 is transferred to the pilot load path 9A, the pilot connection path 18.17, the first switching member 12, and the pilot connection path 1.
6. It flows through the pilot path 5F and is introduced into the fluid chamber 5A, and the third main valve body 5 is biased by the acting force based on the pressure of the pilot fluid and the force of the spring 5D, and flows between the first load path A and the discharge path 2. Cut off. Further, the pilot fluid flows from the pilot connection path 18 through the pilot connection path 38, the seventh switching member 36, the pilot connection path 37, and the pilot path 4F, and is introduced into the fluid chamber 4A, and the second main valve body 4 is introduced into the first action chamber. The pilot fluid of 4B is connected to the pilot path 4J and the pipe connection path 39.
．． 30.15, pilot load path 9B of pilot valve 9
, pilot discharge path 9R, pilot connection path 42.43
, because it flows through the pilot discharge channel 7 and is discharged to the low pressure side, it is biased by the acting force based on the pressure of the pilot fluid introduced into the fluid chamber 4A and the force of the spring 4D, and the supply channel P and the second
The load path B is cut off. Further, the pilot fluid flowing into the pilot supply path 10P of the pilot valve 10 is transferred to the pilot load path 10A1, the pilot connection path 27.26, the third switching member 13, the pilot connection path 25, and the pilot path 6F.
is introduced into the fluid chamber 6A, and the fourth main valve body 6 is biased by the acting force based on the pressure of the pilot fluid and the force of the spring 6A, thereby blocking the second load path B and the discharge path 2. Further, the pilot fluid is transferred from the pilot connection path 27 to the pilot connection path 34, the fifth switching member 31, the pilot connection path 33,
The first fluid flows through the pilot path 3F and is introduced into the fluid chamber 3A.
In the main valve body 3, the pilot fluid in the first action chamber 3B is connected to the pilot path 3J1, the pilot connection path 38A, 21.22, the pilot load path 10B of the pilot valve 10, the pilot discharge path 10R, and the pilot connection path 45.44.42.43.
, because it flows through the pilot discharge channel 7 and is discharged to the low pressure side, it is biased by the acting force based on the pressure of the pilot fluid introduced into the fluid chamber 3A and the force of the spring 3D, and the supply channel P and the first
The load path A is cut off. That is, as shown in FIG. 2, the fourth device X has a first switching function that cuts off the supply path P, the first load path A, the second load path B, and the discharge path R;
Fluid actuator 1 is stopped.

Next, when one pilot valve 9 is energized and switched to the second position 9D, the pilot fluid in the pilot supply path 9P is transferred to the pilot load path 9B and the pilot connection path 15.30.
．． 39, it flows through the pilot path 4J and is introduced into the first action chamber 4B, and at the same time flows through the pilot connection path 14.13 from the pilot connection path 15 and is introduced into the pilot operation path 12A of the first switching member 12, so that the first switching Element 12 switches pilot connection 16 into pilot connection 19 . The second main valve element 4 switches the pilot fluid in the fluid chamber 4A to the pilot path 4F, the pilot connection path 37, and the seventh switching channel against the force of the spring 4D by the action force based on the pressure of the pilot fluid introduced into the first action chamber 4B. Member 36, pilot connection path 3
8. The pilot connection path 18, the pilot load path 9A of the pilot valve 9, and the pilot discharge path 9R are operated to the left in FIG. 1 while discharging to the low pressure side to connect the supply path P and the second load path B. It goes through. The third main valve body 5 resists the force of the spring 5D by the acting force based on the pressure of the first load path A acting on the head, and moves the pilot fluid in the fluid chamber 5A to the pilot path 5F1.
The pilot connection path 16, the first switching member 12, the pilot connection path 19.20.21.22, the pilot load path 10B1 of the pilot valve 10, and the pilot discharge path 10R operate to the right in FIG. 1 while discharging to the low pressure side. The discharge path R and the first load path A are communicated with each other. That is, the system switches to the first device Y shown in FIG. 2, and the fluid actuator 1 operates in the downward direction in FIG.

Next, when the pilot valve 9 is de-energized to return to the state shown in FIG. 1 and then the other pilot valve 10 is energized and switched to the second position 10D, the pilot fluid in the pilot supply path 10P is transferred to the pilot load path 10B1. It flows through the pilot connection path 22.21.38A and the pilot path 3J and is introduced into the first working chamber 3B. In addition, pilot connection path 2
The pilot fluid flowing through the pilot connection 24.2
3 to the pilot operating path 13A of the third switching member 13.
At the same time, it flows from the pilot connection path 24 through the pilot connection path 32 and is introduced into the pilot operation path 31A of the fifth switching member 31. The third switching member 13 switches and connects the pilot connection path 25 to the pilot connection path 28;
The fifth switching member 31 switches the pilot connection path 33 into communication with the pilot connection path 35 . The first main valve body 3 switches the pilot fluid in the fluid chamber 3A to the pilot path 3F, the pilot connection path 33, and the fifth switching channel against the force of the spring 3D by the action force based on the pressure of the pilot fluid introduced into the first action chamber 3B. The member 31, the pilot connection path 35.29.30.15, the pilot load path 9B of the pilot valve 9, and the pilot discharge path 9R are operated to the left in FIG. One load path A is communicated with the other. Based on the pressure of the second load path B acting on the head, the fourth main valve body 6 transfers the pilot fluid in the fluid chamber 6A against the force of the spring 6D to the pilot path 6F1, the pilot connection path 25, and the third Switching member 13, pilot connection path 28.29.30.15,
While discharging to the low pressure side through the pilot load path 9A and pilot discharge path 9R of the pilot valve 9, it operates rightward in FIG. 1 to establish communication between the discharge path R and the second load path B. That is, the switch is switched to the second device Z shown in FIG. 2, and the fluid actuator 1 operates upward in FIG. 1.

Next, after de-energizing the pilot valve 10 to return to the state shown in FIG. 1, energizing both pilot valves 9 and 10 and switching them to the second positions 9D and 10D, the pilot fluid in the pilot supply path 9P is The pilot fluid flowing through the pilot load path 9B, the pilot connection path 15, 30, 39, and the pilot path 4J is introduced into the first working chamber 4B, and the pilot fluid flowing through the pilot connection path 15 is introduced into the pilot connection path 1.
4.13 and is introduced into the pilot operation path 12A of the first switching member 12, so that the first switching member 12 switches the pilot connection path 16 into communication with the pilot connection path 19. Also,
The pilot fluid in the pilot supply path 10P is the pilot load path 10B and the pilot connection path 22.21.38A1.
It flows through the pilot path 3J and is introduced into the first action chamber 3B,
Furthermore, the pilot fluid flowing through the pilot connection path 22 flows through the pilot connection path 24.23 and the third switching member 13
is introduced into the pilot operating path 13A of the third switching member 1.
3 switches the pilot connection path 25 to the pilot connection path 28 and flows through the pilot connection path 32 from the pilot connection path 24 and is introduced into the pilot operation path 31A of the fifth switching member 31, so that the fifth switching member 31 is connected to the pilot connection path 28. The connection path 33 is switched and communicated with the pilot connection path 35. In the third main valve body 5, the pilot fluid flows through the pilot load path 10B1 of the pilot valve 10, the pilot connection path 22.19, the first switching member 12, the pilot connection path 16, and the pilot path 5F, is introduced into the fluid chamber 5A, and is discharged. The road R and the first load road A are cut off. The fourth main valve element 6 has pilot fluid flowing through the pilot load path 9B of the pilot valve 9, the pilot connection path 15, 30, 29, 28, the third switching member 13, the pilot connection path 25, and the pilot path 6F.
A is introduced to cut off the discharge path R and the second load path B.

The second main valve body 4 switches the pilot fluid in the fluid chamber 4A to the pilot path 4F, the pilot connection path 37, and the seventh switching channel against the force of the spring 4D by the action force based on the pressure of the pilot fluid introduced into the second action chamber 4B. Member 36, pilot connection path 38
．． 18. While flowing through the pilot load path 9A and pilot discharge path 9R of the pilot valve 9 and leading it to the low pressure side, it operates to the left in FIG. 1 to establish communication between the supply path P and the second load path B.

The pressure fluid in the supply path P flows through the second load path B and is introduced into the head chamber IB of the fluid actuator 1, and the pressure in the rod chamber IA of the fluid actuator 1 increases due to the introduction of the pressure fluid into the head chamber IB. The first main valve body 3 receives an acting force based on the pressure of the fluid that flows from the rod chamber IA of the fluid actuator 10 through the first load path A and is introduced into the second action chamber 3C.
Based on the pressure of the pilot fluid introduced into the action chamber 3B (if the sum of the action force exceeds the sum of the spring 3D force and the action force based on the pressure of the pilot fluid introduced into the fluid chamber 3A, the force will move to the left in Figure 1). The actuator operates to establish communication between the supply path P and the first load path A.The fluid in the rod chamber 1A of the fluid actuator 1 flows through the first load path A, the supply path P, and the second load path B and is introduced into the head chamber IB. A differential circuit is constructed, and a counterbalance function is obtained by the first main valve body 3, and the fluid actuator operates at high speed in the downward direction in FIG. Change.

FIG. 3 shows a structure in which the first switching member 12 shown in FIG. 1 is replaced with a second switching member 46, and the third switching member 13 is replaced with a fourth switching member 47.
6 is a pilot path 5 connected to the fluid chamber 5A of the third main valve body 5
The pilot connection path 16 connected to F is connected to the pilot load path 10B of the pilot valve 10 via the pilot connection path 19. The pilot connection path 25 connected to the pilot path 6F connected to the fluid chamber 6A is connected to the pilot valve 9 via the pilot connection path 28, 29, 30, 15.
The second switching member 46 and the fourth switching member 47 have the same internal structure. According to this configuration, the pilot valve 9
．． 10 is in a de-energized state, and the fourth device This is the second switching function that communicates.

FIG. 5 shows the first switching member 12 without changing the first switching member 12 shown in FIG. 1.
The third switching member 13 shown in the figure is replaced with the fourth switching member 47 shown in FIG. 3 and the fourth switching member 47 shown in FIG. This is a third switching function that disconnects the discharge path R and establishes communication between the discharge path R and the second load path B.

FIG. 7 shows the first switch without changing the third switching member 13 shown in FIG.
The first switching member 12 shown in the figure is replaced with the second switching member 46 shown in FIG. 3, and in the fourth device This is a fourth switching function that disconnects the discharge path R and communicates the first load path A with each other.

With this operation, the switching function of the fourth device X can be changed, so that it can be used in a wide range of applications. Moreover, since each switching member selectively attached to the flow path forming member 11 can be made small and easy to handle, it has the effect that management is easy and changes and attachments can be easily made even after the directional control valve device is installed.

In addition, in one embodiment, the fifth switching member 31 and the seventh switching member 3
6 is selectively attached to the flow path forming member 11 in a changeable manner.
Each of these switching members may be fixed to the flow path forming member 11.

FIG. 9 shows another embodiment of the present invention, in which the fifth switching member 31 shown in FIG. 1 is replaced with a sixth switching member 48, and the first main valve body 49 is replaced with the second main valve body. 4, and the sixth switching member 48 is connected to the pilot connection path 33 connected to the pilot path 3F connected to the fluid chamber 3A of the first main valve body 49.
pilot valve 1 via pilot connection 34.27
0 pie〈 Bet load path! According to this configuration, the pilot valves 9 and 10 are both energized and switched to the second position 9D and IOD, and the main valve 2 is switched to the third position to form a differential circuit. The first main valve body 49 does not have a counterbalance function when the valve is closed.

FIG. 10 shows still another embodiment of the present invention,
The fifth switching member 31 shown in FIG. 1 is replaced with the sixth switching member 48 shown in FIG. 9, and the seventh switching member 36 shown in FIG.
The switching member 50 is modified and attached to the first main valve body 51.
is provided in the same shape as the second main valve body 4 shown in FIG. 1, the second main valve body 52 is provided in the same shape as the first main valve body 3 shown in FIG. At the first position 9C of the pilot valve 9, the pilot connection passage 37, which connects to the pilot passage 4F connected to the fluid chamber 4A of the second main valve body 52, is connected to the pilot valve 9 through the pilot connection passage 38.18. At the same time, at the second position 9D of the pilot valve 9, the pilot connection path 37 is switched into communication with the pilot load path 10B of the pilot valve 10 via the pilot connection path 53.20.21.22. The pilot operating channel 50A is connected to the pilot load channel 9B of the pilot valve 9 via a pilot connection channel 54.14.15. According to this configuration, when the main valve 2 is switched to the third position and a differential circuit is configured, the second main valve body 5
2 provides a counterbalance function.

FIG. 11 shows another embodiment of the present invention, in which the first main valve body 55 and the second main valve body 56 are replaced by the third main valve body 5 and the fourth main valve body shown in FIG. It is provided in the same shape as the valve body 6, so that the pressure fluid of the supply path P acts on the head of the first main valve body 55 and the second main valve body 560. In this case, the pilot paths 3J and 4J are unnecessary, so the pilot connection path 38A1
The connection point to No. 39 is closed. and,
With this configuration, four switching functions can be freely changed at the fourth position of the main valve, similar to that shown in FIG.

〔Effect of the invention〕

As described above, the present invention provides a first main valve body that cuts off communication between a supply path that supplies pressure fluid and a first load path that connects to a fluid actuator, and a first main valve body that disconnects communication between a supply path that supplies pressure fluid and a first load path that connects to a fluid actuator; a second main valve body that blocks communication; a third main valve body that blocks communication between the first load path and the discharge path connected to the low pressure side;
A main valve equipped with a fourth main valve body that disconnects communication between the second load path and the discharge path, and a main valve that introduces pilot fluid into the fluid chambers formed at the back of the four main valve bodies, or controls the pilot fluid in the fluid chamber. A first position that communicates between the pilot supply path and one pilot load path and communicates between the pilot discharge path and the other pilot load path so as to discharge to the low pressure side, and a first position that communicates between the pilot supply path and the other pilot load path. two pilot valves having a second position which can be freely switched and communicated with each other and which communicates between the pilot discharge passage and one of the pilot load passages;
The flow path forming member is provided with a fluid chamber on the back of the main valve body and a flow path forming member in which a plurality of pilot connection paths are formed to connect between each pilot load path of the two pilot valves. By switching the pilot connection path so that one of the pilot valves is in the first position and the other is in the second position, the main valve communicates between the supply path and the second load path, and also communicates between the discharge path and the first load path. By switching one of the pilot valves to the first position, one of the pilot valves to the second position, and the other to the first position, the main valve communicates between the supply path and the first load path, and also connects the discharge path and the second load path. The fluid actuator is configured to switch both pilot valves to the second position so that the main valve blocks the discharge path and enables communication between the supply path, the first load path, and the second load path. A third position constituting the differential circuit is provided so that when both pilot valves are switched to the first position, the main valve is switched to the fourth position. Depending on the switching operation between the 1st position and the 2nd position, the pilot connection path connected to the fluid chamber on the back of the third main valve body is connected to one pilot load path of one pilot valve and the other pilot load path of the other pilot valve. and a second switching member that connects the pilot connection path connected to the fluid chamber on the back of the third main valve body to the other pilot load path of the other pilot valve. At the same time, when the other pilot valve is switched between the first position and the second position, the pilot connecting path connected to the fluid chamber on the back of the fourth main valve body is connected to the negative or negative side of one of the pilot valves of the other pilot valve. A third switching member that switches between the load passage and the other pilot load passage of one pilot valve, and a pilot connection passage connected to the fluid chamber at the back of the fourth main valve to the other pilot load passage of one pilot valve. The fourth switching member to be connected can be freely selected and attached, and the fourth position of the main valve can be changed to a plurality of switching functions by selectively attaching each switching member to the flow path forming member. Therefore, the switching function at the fourth position of the main valve can be changed depending on the application, and it is possible to correspond to a wide range of applications.

In addition, each switching member selectively attached to the flow path forming member is small and easy to handle (as a single unit), so management is easy and changes and attachments can be easily made even after the directional control valve device is installed.

[Brief explanation of drawings]

1 to 8 show an embodiment of the present invention,
Figure 1 is a partial cross-sectional circuit diagram of the directional control valve device;
The figure is a symbol diagram showing the switching function in the directional control valve device shown in FIG. 1, and FIGS. 4, 6, and 8 are symbol diagrams showing switching functions in the directional control valve devices shown in FIGS. 3, 5, and 7, respectively, and FIG. 9 is a circuit diagram showing the present invention in cross section. A circuit diagram showing a partial cross section of a directional control valve device showing another embodiment, No. 10
The figure is a partial cross-sectional circuit diagram of a directional control valve device showing still another embodiment of the present invention, and FIG. 11 is a partially cross-sectional circuit diagram of a directional control valve device showing still another embodiment of the present invention. It is a circuit diagram. 1--solid fluid actuator, 2-m-main valve, 3-11 first main valve body, 4-m-2nd main valve body, 5--1 third main valve body, 61--4th Main valve body, 9.10-11 pilot valve,
11-m-flow path forming member, 12-m-first switching member, 1
3-m--third switching member, 46---second switching member, 47
1--4th switching member, P-m-supply path, A--1 first load path, B--1 second load path, R--1 discharge path.

Claims (1)

[Claims] A first main valve body that disconnects communication between a supply path that supplies pressure fluid and a first load path that connects to the fluid actuator; and a second main valve body that disconnects communication between the supply path and a second load path that connects to the fluid actuator. , a main valve including a third main valve body that disconnects communication between the first load path and the discharge path connected to the low pressure side, and a fourth main valve body that disconnects communication between the second load path and the discharge path; The pilot supply path and one pilot load path communicate with each other so as to introduce pilot fluid into the fluid chamber formed at the back of the main valve body, and to discharge the pilot fluid in the fluid chamber to the low pressure side. It has a first position that communicates between the other pilot load path and a second position that communicates between the pilot supply path and the other pilot load path and communicates between the pilot discharge path and one pilot load path, which can be freely switched. Two pilot valves, and a plurality of pilot connections that are interposed between the main valve and the two pilot valves and connect between the fluid chambers on the backs of the four main valve bodies and each pilot load path of the two pilot valves. The flow path forming member has a pilot connection path formed inside the main valve by switching one of the pilot valves to a first position and the other to a second position. By switching one of the pilot valves to the second position and the other to the first position, the main valve is placed in the first position, which communicates between the supply path and the second load path, and also communicates between the discharge path and the first load path. is in the second position, which communicates between the supply path and the first load path, and also communicates between the discharge path and the second load path, and by switching both pilot valves to the second position, the main valve shuts off the discharge path. At the same time, by switching both the pilot valves to the first position, the main valve are provided to switch to the fourth position, respectively, and the flow path forming member has a pilot connection connected to the fluid chamber on the back of the third main valve body in response to switching operation between the first position and the second position of one pilot valve. a first switching member that switches the passage between one pilot load passage of one pilot valve and the other pilot load passage of the other pilot valve; and a pilot connection passage connected to the fluid chamber on the back of the third main valve body. The second switching member connected to the other pilot load path of the other pilot valve is changeably selected and installed, and the fourth switching member is connected to the other pilot load path in accordance with the switching operation between the first position and the second position of the other pilot valve. a third switching member that switches a pilot connection path connected to the fluid chamber on the back of the valve body to one pilot load path of the other pilot valve and the other pilot load path of the one pilot valve; and a fourth main valve body. A pilot connection path connected to the fluid chamber at the back and a fourth switching member connecting the other pilot load path of one pilot valve are freely selected and installed, and each switching member to the flow path forming member is provided. A directional control valve device characterized in that the fourth position of the main valve can be freely changed to a plurality of switching functions by selective attachment of the directional control valve device.