JP2544804Y2 - Direction control valve device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a directional control valve device in which a pressure control valve is integrally connected to a plurality of directional control valves interconnected and connected.

[0002]

2. Description of the Related Art A directional control valve device of this type is shown in FIG. 9 shown in Japanese Utility Model Application No. 2-229131 already filed by the applicant. In this directional control valve device, three directional control valves 1A, 1B, and 1C are connected and connected to each other to communicate between each supply flow path P and each discharge flow path R of the directional control valves 1A, 1B, and 1C. The two load flow paths A and B of the directional control valves 1A, 1B and 1C are connected to the fluid actuators 2A, 2B and 2C, respectively, and the directional control valve 1A at one end is provided with a pressure control valve. The pressure control valve 3 is provided integrally with the supply flow path P1 and the discharge flow path R1 of the pressure control valve 3 so as to communicate with the supply flow path P and the discharge flow path R of the direction control valve 1A. Is provided with an action chamber 5 formed at the back of the valve body 4 and a switching valve body 6 of each of the directional control valves 1A, 1B and 1C.
A, 6B, 6C pilot passages 7, 8 provided in each of the directional control valves 1A, 1B, 1C so that communication can be cut off freely by sliding in the axial direction.
When at least one directional control valve 1A or 1B or 1C is in the switching position, the pilot paths 7 and 8 are shut off and the supply paths P1 and P are in the on-load state. And all three directional control valves 1A, 1B,
When 1C is at the neutral position as the original position, the pilot paths 7 and 8 are communicated with each other so that the supply flow paths P1 and P are brought into the unload state. And each direction control valve 1A,
Fluid actuators 2A, 2B, 2C by 1B, 1C
Are controlled individually.

[0003]

However, in the directional control valve device having such a structure, at least one directional control valve 1A is provided.
Or, if 1B and 1C are in the switching position, pilot path 7,
8, the supply passages P1, P are set to the on-load state, and when all three directional control valves 1A, 1B, 1C are at the neutral position, the pilot passages 7, 8 are communicated with each other and the supply passage P
For example, when the directional control valve 1A is switched from the neutral position to the switching position and the directional control valve 1A at the switching position is returned to the neutral position, the switching valve body 6A In the switching position, when the foreign matter caught in the fluid bites into the fluid at the switching position and the sticking phenomenon occurs, it is impossible to return to the neutral position and slide, so that the pilot paths 7 and 8 are shut off.
The pressure control valve 3 cannot switch the supply flow paths P1 and P from the on-load state to the unload state, and the pressure fluid of the supply flow paths P1 and P in the on-load state flows through the load flow path A to the fluid actuator 2A. There has been a problem that the fluid actuator 2A runs out of control and is extremely dangerous.

The present invention solves such a problem. When the directional control valve at the switching position is operated to return to the original position, even if the switching valve body cannot return to the original position from the switching position and slides. An object of the present invention is to provide a directional control valve device capable of reliably switching a supply flow path from an on-load state to an unload state to improve safety.

[0005]

Therefore, in the directional control valve device according to the first aspect, a supply flow path for supplying a pressure fluid, two load flow paths connected to a fluid actuator side, and a low pressure side are connected. The switching valve body is slidably fitted inside the valve body having a discharge flow path to be switched, and switching between the respective flow paths is possible by axial sliding from the original position of the switching valve body to the switching position. a plurality provided directional control valve to which, joined connecting the valve body of each directional control valve so as to communicate with the plurality of directional control valves of <br/> each between supply channel and between the discharge channel respectively mutually And provided
One end of each directional control valve is connected and connected to the body of the on-off valve.
The valve body of the pressure control valve is
Connection of the directional control valve to the valve body of the pressure control valve.
Supply flow path and discharge respectively communicating with supply flow path and discharge flow path
And a pressure control valve having at least one directional control valve at a switching position to set the supply flow path to an on-load state and to set the supply flow path to an unload state at an original position of all directional control valves. The operation chamber formed on the back of the valve body housed inside the valve body is connected to the directional control valve so that the communication can be cut off by sliding the switching valve body of each directional control valve in the axial direction. provided in connection to the side, the between the pressure control valve and the directional control valve
The opening / closing valve that interposes the body is a supply flow path and a discharge flow path that communicate between the supply flow path and the discharge flow path of the pressure control valve and the direction control valve, respectively, and a working chamber of the pressure control valve and a pilot of the direction control valve. The pilot path that communicates between the paths and the pilot path of the directional control valve that branches off from this pilot path
The main body has a pilot discharge path connected to the low pressure side without intervening, and shuts off the pilot discharge path and switches to the switching position in accordance with the switching operation of at least one directional control valve from the original position to the switching position inside the main body. An electromagnetic opening / closing valve body that connects the pilot discharge path to the low pressure side with the return operation of a certain directional control valve to the original position is housed.

According to a second aspect of the present invention, there is provided a directional control valve device, wherein a main body is provided between the pressure control valve and the directional control valve according to the first aspect.
Off valve for switching interposed to the supply channel on the load state and the unloaded state includes a supply passage for respectively communicating the inter-supply flow path and between the discharge channel of the pressure control valve and the directional control valve The main body has a discharge passage, a pilot passage connecting the working chamber of the pressure control valve and the pilot passage of the directional control valve, and a connection passage branched from the supply passage and connected to the low pressure side. Electromagnetic operation for shutting off the connection flow path in accordance with the switching operation of the one directional control valve from the original position to the switching position and communicating the connection flow path in response to the returning operation of the directional control valve in the switching position to the original position. The on-off valve body is housed.

[0007]

In the directional control valve device according to the first aspect of the present invention, when the directional control valve at the switching position is returned to the original position, the on-off valve is operated by the on-off valve body at a low pressure in the pilot discharge path. The pressure control valve switches the supply passage from the on-load state to the unload state by connecting the working chamber at the back of the valve body to the low-pressure side via the pilot path and the pilot discharge path. In the directional control valve device according to the second aspect, with the return operation of the directional control valve at the switching position to the original position, the on-off valve communicates with the on-off valve body through the connecting flow path and the supply flow path with the connecting flow path. The supply passage is switched from the on-load state to the unload state by communicating with the low-pressure side via the path. Therefore, in the directional control valve device according to both claims, when the directional control valve at the switching position is operated to return to the original position, even if the switching valve body cannot return to the original position and slides from the switching position, the supply can be performed. The flow path can be reliably switched from the on-load state to the unload state, and safety can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 10A, 10B, 1
Reference numeral 0C denotes three directional control valves, a supply flow path P2 for supplying a pressure fluid, two load flow paths A2 and B2 connected to the fluid actuators 11A, 11B and 11C, and a discharge flow path R2 connected to the low pressure side. 13A, 13B, 13 having
C are provided so as to be joined to each other in the vertical direction in FIG. 2, and are provided so as to communicate between the respective supply flow paths P2 and between the respective discharge flow paths R2. Reference numeral 30 denotes a pressure control valve which has a supply flow path P3 and a discharge flow path R3 in the valve body 31 and switches the supply flow path P3 between an on-load state and an unload state.
2 is provided integrally with the direction control valve 10A at one end of FIG. 2, and the supply flow path P3 and the discharge flow path R3 are respectively connected to the supply flow path P2 and the discharge flow path R2 of the direction control valve 10A. It is provided in communication. Reference numeral 51 denotes a side plate member provided in connection with the direction control valve 10C at the other end of FIG.
A flow path 59 connecting the discharge flow path R2 of the direction control valve 10C and a pilot path 33 described later in detail is provided inside.
Reference numeral 52 denotes four bolt members, which are fixedly provided with three directional control valves 10A, 10B, and 10C, a pressure control valve 30, an on-off valve 50, and a side plate member 51 which are joined and connected.

As shown in FIG. 3, a directional control valve 10A (the directional control valves 10B and 10C have the same configuration as the directional control valve 10A) is provided at intervals in the axial direction of the flow paths P2, A2, B2 and R2. An open fitting hole 14 is provided through the valve body 13A, and a switching valve body 15 is provided in the fitting hole 14 so as to be slidable in the axial direction. Reference numerals 16A and 16B denote lid members fixed on both side surfaces of the valve body 13A to close both ends of the fitting hole 14, and to open pilot chambers 17A and 17B at both ends of the switching valve body 15.
B is sectioned. Reference numerals 18A and 18B denote springs housed in the pilot chambers 17A and 17B, which are provided so as to hold the switching valve body 15 at a neutral position as an original position. And
Pilot channels 19 are provided in the pilot chambers 17A and 17B.
A, 19B, 20A, 20B, 21A, 21B, 22
The pilot fluid is provided so as to be freely introduced through A and 22B. Reference numerals 23A and 23B denote pilot valves for raising and lowering the pilot fluid pressure introduced into the pilot chambers 17A and 17B in accordance with an increase or decrease in the value of a current supplied to the coils 24A and 24B. The pilot valves are fixed to the lid members 16A and 16B. Pilot valves 23A and 23B are internally urged by springs 43A and 43B to be seated on valve seats 25A and 25B.
A and 26B, and the pilot chambers 17A and 26B are separated from the valve seats 25A and 25B by the pilot chambers 17A and 26B.
A, the pilot fluid of 17B, the pilot flow path 27A,
27B, 28A, 28B, 29A, and 29B so as to be freely discharged to the discharge flow path R2.
The seating force of the 6B on the valve seats 25A and 25B is provided so as to be adjustable in accordance with the current value. Reference numerals 32 and 33 denote pilot passages formed in the fitting hole 14 so as to be annularly depressed at intervals in the axial direction, and communicate between the pilot passages 32 and 33 at a neutral position of the switching valve body 15 shown in FIG. The switching valve body 15 is provided so as to cut off between the pilot paths 32 and 33 by sliding in the axial direction from the neutral position to the switching position in the left-right direction.

As shown in FIG. 4, a pressure control valve 30 accommodates a main valve body 34 as a valve body slidably in the axial direction inside a valve body 31 and an action chamber 35 at the back of the main valve body 34. The working chamber 35 is formed so that a part of the pressure fluid in the supply flow path P3 is freely introduced as a pilot fluid through a flow path 36 provided in the main valve body 34, and the main valve body 34 is provided inside the supply flow path P3. And a spring 37 for urging the discharge passage R3 in the blocking direction. Further, a pilot path 44 is connected to the action chamber 35. Reference numeral 38 denotes a pilot valve for setting a pilot fluid pressure introduced into the working chamber 35 to a set value, which is fixed to the valve body 31 and has a pilot valve body 40 seated on a valve seat 39 inside. The pilot fluid in the pilot chamber 35 is provided so as to be freely discharged to the discharge flow path R3 by being separated from the valve seat 39, and the force of the spring 41 is adjusted by the adjusting member 42 to adjust the seating force of the pilot valve body 40 on the valve seat 39. It is provided freely. Reference numeral 45 denotes a pressure reducing valve body slidably fitted inside the valve body 31. A part of the pressure fluid in the supply flow path P3 is introduced as a pilot fluid through a flow path 46, and the introduced pilot fluid is depressurized. Control the pilot channel 47
A, 47B.

As shown in FIG. 5, an on-off valve 50 is branched from a supply passage P4, a discharge passage R4, a pilot passage 54, pilot passages 55A and 55B, and a pilot passage 54 in the main body 53, and directional control valves 10A and 10B. Pyro of 10C
It has a pilot discharge path 56 connected to the discharge flow path R4 without passing through the cut paths 32 and 33 (see FIG. 1) . And
As shown in FIG. 1, the supply flow path P4 communicates between the pressure control valve 30 and the supply flow paths P3 and P2 of the direction control valve 10A, the discharge flow path R4 communicates between the discharge flow paths R3 and R2, and the pilot flow path. 54 communicates between the pilot paths 44 and 32, and pilot paths 55A and 55B are pilot paths 47A and 47B,
19A and 19B are connected. Reference numeral 57 denotes an on-off valve body slidably housed inside the main body 53. The on-off valve body 57 is provided with a pilot discharge path 56 so as to be capable of communicating and shutting off by an electromagnetic operation of energizing and de-energizing an electromagnetic device 58 disposed behind the on-off valve body 57. . The on-off valve body 57 has at least one directional control valve 10A.
Alternatively, when the pilot valve 23A or 23B is energized, the electromagnetic device 58 is energized so as to switch the 10B and 10C from the neutral position to the switching position, and slides rightward in FIG. The directional control valve 10A or 10A in the switching position is shut off while the discharge path 56 is shut off.
B and 10C are returned to the neutral position, and the electromagnetic device 58 is energized with the non-energization of the pilot valve 23A or 23B.
Are de-energized and return to the position shown in FIG. 5 by the force of the spring 59 so as to communicate with the pilot discharge path 56.

Next, the operation of the above configuration will be described. When the pressurized fluid is supplied to the supply flow path P3 from the state shown in the drawing, the directional control valves 10A, 10B and 10C
A, each channel P2 held in the neutral position by the force of 18B,
A pilot fluid, which is shut off between A2, B2, and R2 and communicates between the pilot paths 32, 33, is controlled by the pressure reducing valve body 45 to flow into the pilot chambers 17A, 17B at both ends of the switching valve body 15. Roads 47A, 47B,
55A, 55B, 19A, 19B, 20A, 20B, 2
1A, 21B, and flow into the pilot valve 23A,
23B is a non-energized pilot valve body 26A, 26B
With the highest seating force due to the springs 43A and 43B.
A, 25B, the pilot fluid pressure in the pilot chambers 17A, 17B is set to the highest level, the on-off valve 50 is not energized to the electromagnetic device 58, the on-off valve body 57 communicates with the pilot discharge path 56, and pressure control is performed. The valve 30 communicates with the discharge chamber R2 via the pilot passages 44, 54 through the pilot passages 44, 54, the pilot passages 32, 33 of the directional control valves 10A, 10B, and 10C, and the passage 59. The discharge passage R from the passage 54 through the pilot discharge passage 56
4, the main valve element 34 slides leftward in FIG. 4 against the force of the spring 37, and communicates between the supply flow path P3 and the discharge flow path R3 to supply the flow paths P3, P4, and P2. In the unload state, and the fluid actuators 11A, 11B, and 11C are stopped.

In this state, for example, when the pilot valve 23A of one directional control valve 10A is energized, an attraction force corresponding to the energized current acts on the pilot valve body 26A, and the pilot valve body 26A is applied to the valve seat 25A. The seating force is spring 43A
The value is obtained by subtracting the suction force from the force, and the pilot chamber 17
The pilot fluid pressure of A is controlled to decrease. Switching valve element 15
FIG. 3 shows the switching position from the neutral position to the switching position where the acting force based on the pilot fluid pressure in the pilot chamber 17B set by the pilot valve 23B and the acting force based on the lowered pilot fluid pressure in the pilot chamber 17A and the spring 18A force are balanced. Of the supply flow path P2 and the load flow path A
2 and between the load flow path B2 and the discharge flow path R2 are set to an opening degree in accordance with the value of the current supplied to the pilot valve 23A to switch and communicate between the pilot paths 32 and 33. The on-off valve 50 is energized by energizing the electromagnetic device 58 upon energization of the pilot valve 23A of the directional control valve 10A, and the on-off valve body 57 slides rightward in FIG. Block 56. The pressure control valve 30 shuts off the pilot passages 32 and 33 and shuts off the pilot discharge passage 56 so that the pilot fluid in the working chamber 35 is released from the pilot passage 4.
4 and 54, the main valve body 34 returns to the position shown in FIG. 4 by the force of the spring 37 and slides back to cut off between the supply flow path P3 and the discharge flow path R3 to unload the supply flow paths P3, P4, and P2. The on-load state is switched from the state to the set pressure of the pilot valve 38. In the fluid actuator 11A, the pressure fluid in the supply flow paths P3, P4, and P2 in the on-load state flows through the load flow path A2, is introduced, and discharges the fluid from the load flow path B2 to the discharge flow path R2. The operation is controlled upward. At this time, the other two directional control valves 10B, 1B
0C is held in the neutral position.

When the value of the current supplied to the pilot valve 23A is increased, the seating force of the pilot valve body 26A on the valve seat 25A is reduced, so that the pilot fluid pressure in the pilot chamber 17A is further lowered, and the switching valve body is controlled. Reference numeral 15 further slides leftward in FIG. 3 to a switching position where the acting force based on the lowered pilot fluid pressure is balanced, and the flow paths P2 and A
The opening degree setting between 2 and between B2 and R2 is increased. Also,
If the value of the current supplied to the pilot valve 23A is reduced, the seating force of the pilot valve body 26A on the valve seat 25A is increased, and the pilot fluid pressure in the pilot chamber 17A is controlled to rise,
The switching valve element 15 slides rightward in FIG. 3 to a switching position where the acting force based on the increased pilot fluid pressure is balanced, and the opening degree between each flow path P2 and A2 and between B2 and R2 is reduced. I do.

In this state, when the pilot valve 23A is de-energized, the pilot fluid pressure in the pilot chamber 17A is set to the maximum and becomes the same as the pilot fluid pressure in the pilot chamber 17B, and the switching valve body 15 is forced by the spring 18A. 3 returns to the neutral position in FIG. 3 and slides through each of the flow paths P2, A2, and B.
2 and R2 are cut off and the pilot paths 32 and 33 are connected. When the directional control valve 10A is de-energized to the pilot valve 23A, the electromagnetic device 58 is de-energized, and the on-off valve body 57 returns to the position shown in FIG. Communicate. In the pressure control valve 30, the pilot fluid in the working chamber 35 is discharged, and the main valve body 34 slides leftward in FIG. 4 against the force of the spring 37 to communicate between the supply flow path P3 and the discharge flow path R3. Supply channel P3, P
4. P2 is switched from the on-load state to the unload state, and the fluid actuator 11A stops operating.

The pilot valve 2 of the directional control valve 10A
3B, the switching valve element 15 slides to the right in FIG. 3 to move between the supply flow path P2 and the load flow path B2 and the load flow path A2.
The fluid actuator 11A is controlled to operate in the downward direction in FIG. 1 by setting the opening between the and the discharge flow path R2 to an opening corresponding to the value of the current supplied to the pilot valve 23B and switching the fluid. At this time,
As described above, the on-off valve 50 shuts off the pilot discharge path 46, and the pressure control valve 30 switches the supply flow paths P3, P4, P2 from the unload state to the on-load state. When the pilot valve 23B is de-energized, the switching valve body 15 slides back to the neutral position, the fluid actuator 11B stops operating, the on-off valve 50 communicates with the pilot discharge passage 46, and the pressure control valve 30 The supply flow paths P3, P4, and P2 are switched from the on-load state to the unload state.

Another directional control valve 10B or 10C
Is switched, the fluid actuator 11B or 1
1C is operated and three directional control valves 10A, 10A
When all the switches B and 10C are switched, the operation of the fluid actuators 11A, 11B and 11C is controlled, and the two directional control valves 10A, 10B or 10A, 10C and 10C are operated.
When the switching operation is performed between B and 10C, the fluid actuator 11
A, 11B or 11A, 11C or 11B, 11C
Is controlled.

With this operation, the pilot valves 23A, 23
When the directional control valve 10A in the switching position is energized and the pilot valve 23A or 23B is de-energized to return to the neutral position, the on-off valve 50 is turned on when the pilot valve 23A or 23B is de-energized. Since the electromagnetic device 58 is de-energized and the on-off valve body 57 communicates with the pilot discharge path 56, the directional control valve 10 in the switching position
When the valve A is returned to the neutral position, the switching valve body 15 bites in foreign matter mixed in the fluid at the switching position, causing a sticking phenomenon, and cannot return to the neutral position to slide.
The pressure control valve 3 does not
0 indicates that the pilot fluid in the working chamber 35 behind the main valve body 34 can be discharged from the pilot passages 44 and 54 to the discharge passage R4 via the pilot discharge passage 56, so that the supply passages P3 and P
4. P2 can be reliably switched from the on-load state to the unload state, and safety can be improved. Moreover, the opening and closing valve 50 is the main body between the directional control valve 10A and the pressure control valve 30
53, and the pressure control valve 30 is connected to the main body 53.
Between the supply flow paths P3 and P2 of the directional control valve 10A and
A supply channel P that communicates between the discharge channels R3 and R2.
4, the discharge passage R4 and the working chamber 35 of the pressure control valve 30
And a communication path between the pilot path 32 of the directional control valve 10A.
Branch from the pilot road 54 and the pilot road 54
Directional control valves 10A, 10B, 10C
Pilot connected to discharge flow path R4 without passing through 32, 33
Because it has a discharge passage 56, without requiring any special external pipe for the passage connected to the opening and closing valve 50, the body 5 of the on-off valve 50
3 between the pressure control valve 30 and the direction control valve 10A.
Each of the flow paths P3... P2, R3.
.. 32 can communicate with each other, so that the piping can be simplified and can be easily attached, and the whole apparatus can be made compact. Further, the on-off valve body 57 housed inside the main body 53 of the on-off valve 50 may be a small one that opens and closes a pilot discharge passage 56 through which a small flow of pilot fluid flows.
An increase in the size of the entire apparatus can be favorably suppressed.

FIGS. 6 to 8 show another embodiment of the present invention. The same members as those of the embodiment are designated by the same reference numerals, and only different portions will be described. Pressure control valve 30 and direction control valve 10
A on-off valve 60 interposed between A
5, a discharge passage R5, a pilot passage 62, pilot passages 63A and 63B, and a connection passage 64 branched from the supply passage P5 and connected to the discharge passage R5.
Is a supply flow path P3 of the pressure control valve 30 and the direction control valve 10A,
P2, the discharge passage R5 communicates between the discharge passages R3 and R2, and the pilot passage 62 is connected to the pilot passages 44 and 32.
The pilot channels 63A, 63B communicate between the pilot channels 47A, 47B, 19A, 19B. Reference numeral 65 denotes an opening / closing valve body housed inside the main body 61. The opening / closing valve body 65 is provided so that the connection flow path 64 can be freely cut off by an electromagnetic operation of energizing / de-energizing an electromagnetic device 66 disposed behind the opening / closing valve body 65. The electromagnetic device 66 is energized by energizing the pilot valve 23A or 23B so as to switch at least one of the directional control valves 10A or 10B or 10C from the neutral position to the switching position. 8 to slide to the left in FIG. 8 to block the connection flow path 64, and to switch the directional control valve 10A or 10A in the switching position.
B and 10C are returned to the neutral position and the electromagnetic device 66 is turned off when the pilot valve 23A or 23B is de-energized.
Are de-energized and returned to the position shown in FIG. 8 by the force of the spring 67 so as to communicate with the connection flow path 64.

Next, the operation will be described. When the pressurized fluid is supplied to the supply flow path P3 from the state shown in FIG.
A, 10B, and 10C are held at neutral positions, and each flow path P
2, A2, B2, and R2 are shut off, and the pilot paths 32 and 33 are communicated. The pressure control valve 30 is configured such that the pilot path 44 is the pilot path 62, and the directional control valves 10A and 10A.
Since it communicates with the discharge flow path R2 via the pilot paths 32 and 33 of 0B and 10C and the flow path 59, the supply flow path P3 and the discharge flow path R3 are connected. The on-off valve 60 is not energized to the electromagnetic device 66 and the on-off valve body 65
4 is connected. Thereby, the supply flow paths P3, P5,
P2 is in the unloaded state and the fluid actuator 11
A, 11B and 11C are stopped.

In this state, for example, when the pilot valve 23A of one directional control valve 10A is energized, the directional control valve 10A connects between the supply flow path P2 and the load flow path A2 and between the load flow path B2 and the discharge flow path R2. The opening degree is set in accordance with the value of the current supplied to the pilot valve 23A to switch and communicate, and the pilot passages 32 and 33 are shut off. The discharge path R3 is shut off. The on-off valve 60 is energized by the electromagnetic device 66 when the pilot valve 23A of the directional control valve 10A is energized, and the on-off valve body 65 slides leftward in FIG. Cut off. Accordingly, the supply flow paths P3, P5, and P2 are switched from the unload state to the on-load state, and the operation of the fluid actuator 11A is controlled in the upward direction in FIG.

In this state, when the pilot valve 23A is de-energized, the directional control valve 10A returns to the neutral position in FIG. 6 to slide and shut off the passages P2, A2, B2, and R2, and the pilot passage 32, 33 is communicated. Pressure control valve 3
Numeral 0 communicates between the supply flow path P3 and the discharge flow path R3 by the communication between the pilot paths 32 and 33. When the pilot valve 23A is de-energized, the electromagnetic device 66 is de-energized, and the on-off valve body 65 returns to the position shown in FIG. As a result, the supply flow paths P3, P5, and P2 are switched from the on-load state to the unload state, and the fluid actuator 11A stops operating.

The pilot valve 2 of the directional control valve 10A
3B, the operation of the fluid actuator 11A is controlled downward in FIG. 6, and the other directional control valve 10B or 10B is controlled.
When C is switched, the fluid actuator 11B or 1
1C is operated and three directional control valves 10A, 10A
When all the switches B and 10C are switched, the operation of the fluid actuators 11A, 11B and 11C is controlled, and the two directional control valves 10A, 10B or 10A, 10C and 10C are operated.
When the switching operation is performed between B and 10C, the fluid actuator 11
A, 11B or 11A, 11C or 11B, 11C
Is controlled.

In this operation, when the directional control valve 10A at the switching position is returned to the neutral position with the pilot valve 23A or 23B de-energized, and the opening / closing valve 60 is turned off when the pilot valve 23A or 23B is de-energized.
When the directional control valve 10A at the switching position is returned to the neutral position, the switching valve returns to the neutral position when the directional control valve 10A at the switching position is operated to return to the neutral position. Even if the pressure control valve 30 cannot communicate between the supply flow path P3 and the discharge flow path R3 while the pilot paths 32 and 33 cannot be slid, and the pressure control valve 30 cannot communicate between the supply flow path P3 and the discharge flow path R3, the on-off valve 60 supplies the pressure fluid in the supply flow path P5. Discharge flow path R5 via connection flow path 64
Therefore, the supply flow paths P3, P5, and P2 can be reliably switched from the on-load state to the unload state, and safety can be improved. The opening / closing valve 60 is joined and connected between the directional control valve 10A and the pressure control valve 30 with a main body 61 interposed therebetween , and the main body 61 is connected to the pressure control valve 30 and the directional control valve 10A.
A between each supply flow path P3, P2 and each discharge flow path R3,
A supply flow path P5 and a discharge flow path R5 that respectively communicate between R2 and R2.
And the action chamber 35 of the pressure control valve 30 and the direction control valve 10
A pilot path 62 communicating between the pilot paths 32 of A
In addition, branch from the supply flow path P5 and connect to the discharge flow path R5.
Since the has a connecting channel 64 that, without requiring any special external pipe for the passage connected to the opening and closing valve 60, the main body of the on-off valve 60
61 is interposed between the pressure control valve 30 and the direction control valve 10A.
Each of the flow paths P3... P2, R3.
Since.. 32 can be communicated with each other, the piping can be simplified, the pipe can be easily mounted, and the entire apparatus can be made compact. Further, in the unloaded state, the supply flow path P
3, P5, P2 can be discharged to the discharge flow path R5 via the connection flow path 64 of the on-off valve 60 separately from the pressure control valve 30, so that the supply flow paths P3, P5, P in the unloaded state.
2 can be satisfactorily reduced without being affected by the pressure control valve 30.

[0025]

As described above, in the directional control valve device according to the first aspect, the opening / closing valve having the main body interposed between the pressure control valve and the directional control valve is provided between the supply passages of the pressure control valve and the directional control valve. A supply passage and a discharge passage communicating between the respective discharge passages, a pilot passage communicating between the working chamber of the pressure control valve and the pilot passage of the directional control valve, and a pilot of the directional control valve branched from the pilot passage. The main body has a pilot discharge path connected to the low pressure side without passing through the path, and shuts off and switches the pilot discharge path in accordance with the switching operation of at least one directional control valve from the original position to the switching position inside the main body. The directional control valve device according to claim 2, further comprising an electromagnetically operated opening / closing valve body that communicates the pilot discharge path to the low pressure side with the return operation of the directional control valve at the original position to the original position. , Pressure control The functions of the switching valve is a pressure control valve and the directional control valve the supply flow path and between the supply channel and the discharge channel and a pressure control valve for each communicating between the discharge passage of the intervening body between the valve and the directional control valve The main body has a pilot passage communicating between the chamber and the pilot passage of the directional control valve, and a connecting flow passage branched from the supply flow passage and connected to the low pressure side, and at least one directional control valve is provided inside the main body. An electromagnetic open / close valve body that shuts off the connection flow path with the switching operation from the position to the switching position and communicates the connection flow path with the return operation of the directional control valve in the switching position to the original position is housed. In the directional control valve device according to both claims, when the directional control valve at the switching position is operated to return to the original position, even if the switching valve body cannot return to the original position from the switching position and slides, the supply flow is not increased. Unloading road from on-road condition It is possible to improve the safety can be switched on. The on-off valve is pressure controlled
Bonding connecting interposed the body between the valve and the directional control valve, the book
Supply passage, discharge passage, pilot passage, pilot discharge
Outgoing path (directional control valve device of claim 1), connection flow path (claim
2 directional control valve device), no special external piping for connecting the flow path to the on- off valve is required, and the main body of the on-off valve
Between the pressure control valve and the directional control valve.
Can communicate between each flow path of pressure control valve and directional control valve with
Al, instrumentation with readily installed Hakare simplification of piping
The entire device can be made compact.

Further, in the directional control valve device according to the first aspect, the on-off valve body housed inside the main body of the on-off valve may be a small-sized one that opens and closes a pilot discharge passage through which a small flow of pilot fluid flows. This has the effect of favorably suppressing an increase in the size of the entire apparatus. In the directional control valve device according to the second aspect, the pressure fluid in the supply flow path can be discharged to the low pressure side through the connection flow path of the on-off valve separately from the pressure control valve in the unload state. This has the effect that the pressure in the supply flow path can be satisfactorily reduced without being affected by the pressure control valve.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a directional control valve device according to an embodiment of the present invention.

FIG. 2 is a front view of the directional control valve device showing one embodiment.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged sectional view taken along line BB of FIG. 2;

FIG. 5 is an enlarged sectional view taken along line CC of FIG. 2;

FIG. 6 is a circuit diagram of a directional control valve device showing another embodiment of the present invention.

FIG. 7 is a front view of a directional control valve device showing another embodiment.

FIG. 8 is an enlarged sectional view taken along line DD of FIG. 7;

FIG. 9 is a circuit diagram of a directional control valve device showing a conventional example.

[Explanation of symbols]

 10A, 10B, 10C Direction control valve 11A, 11B, 11C Fluid actuator 13A, 13B, 13C valve body 15 Switching valve body 30 Pressure control valve 31 Valve body 32, 33, 54, 62 Pilot path 34 Main valve body 35 Working chamber 50 , 60 on-off valve 53, 61 main body 56 pilot discharge path 57, 65 on-off valve body 64 connection flow path P2, P3, P4, P5 supply flow path A2, B2 load flow path R2, R3, R4, R5 discharge flow path

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-310298 (JP, A) JP-A-2-291435 (JP, A) JP-A-49-65465 (JP, A) JP-A-57- 127104 (JP, A) JP-A-59-69503 (JP, A) JP-T-61-500374 (JP, A)

Claims (2)

(57) [Scope of request for utility model registration] 1. A switching valve element is slid inside a valve body having a supply flow path for supplying a pressure fluid, two load flow paths connected to a fluid actuator side, and a discharge flow path connected to a low pressure side. movably fitted is provided a plurality of directional control valve is freely switching換連communicating between the flow paths by axial displacement of the switching position from the original position of the switching valve member, each of the plurality of directional control valves Each direction to communicate between the supply flow path and each discharge flow path
The valve body of the control valve is connected and connected to each other.
The body of the on-off valve is interposed at one end where the control valve is connected
Pressure control valve pressure control valve
Supply and discharge of directional control valve by connecting to the valve body of the valve
There is a supply flow path and a discharge flow path that communicate with the flow path, respectively.
The pressure control valve is configured so that the supply flow path is turned on at the switching position of at least one directional control valve and the supply flow path is unloaded at the original positions of all the directional control valves. An action chamber formed at the back of the valve body housed inside is connected to the low pressure side via a pilot passage provided in each direction control valve so that communication can be cut off by axial sliding of the switching valve body of each direction control valve. The on-off valve, which has a main body between the pressure control valve and the directional control valve, has a supply flow path, a discharge flow path, and a pressure that communicate between each supply flow path and each discharge flow path of the pressure control valve and the directional control valve. The main body has a pilot path communicating between the operation chamber of the control valve and the pilot path of the directional control valve, and a pilot discharge path branched from the pilot path and connected to the low pressure side without passing through the pilot path of the directional control valve. At least one inside the body Electromagnetic operation that shuts off the pilot discharge path when the directional control valve is switched from the original position to the switching position and returns the pilot discharge path to the low pressure side when the directional control valve at the switching position returns to the original position. A directional control valve device that houses the on-off valve body. 2. A switching valve body is slid inside a valve body having a supply flow path for supplying a pressure fluid, two load flow paths connected to a fluid actuator side, and a discharge flow path connected to a low pressure side. movably fitted is provided a plurality of directional control valve is freely switching換連communicating between the flow paths by axial displacement of the switching position from the original position of the switching valve member, each of the plurality of directional control valves Each direction to communicate between the supply flow path and each discharge flow path
The valve body of the control valve is connected and connected to each other.
The body of the on-off valve is interposed at one end where the control valve is connected
Pressure control valve pressure control valve
Supply and discharge of directional control valve by connecting to the valve body of the valve
There is a supply flow path and a discharge flow path that communicate with the flow path, respectively.
The pressure control valve is configured so that the supply flow path is turned on at the switching position of at least one directional control valve and the supply flow path is unloaded at the original positions of all the directional control valves. An action chamber formed at the back of the valve body housed inside is connected to the low pressure side via a pilot passage provided in each direction control valve so that communication can be cut off by axial sliding of the switching valve body of each direction control valve. The on-off valve, which has a main body between the pressure control valve and the directional control valve, has a supply flow path, a discharge flow path, and a pressure that communicate between each supply flow path and each discharge flow path of the pressure control valve and the directional control valve. The main body has a pilot passage communicating between the operation chamber of the control valve and the pilot passage of the directional control valve, and a connection flow passage branched from the supply flow passage and connected to the low pressure side, and at least one direction is provided inside the main body. For switching operation of control valve from original position to switching position Directional control valve apparatus formed by accommodated off valve body of the electromagnetic operation for communicating the connecting channel with the return operation to the original position of the directional control valve in a switching position with blocking gastric connecting channel.