JPH04124302U - directional control valve device - Google Patents

Abstract

(57) [Summary] [Purpose] When returning the directional control valve in the switching position to the neutral position, the supply flow path is reliably turned on even if the switching valve body cannot return to the neutral position from the switching position. Improve safety by switching from load state to unload state. [Structure] When operating the directional control valve 10A in the switching position to return to the neutral position, even if the switching valve body cannot return to the neutral position and the pilot passages 32 and 33 remain in the cutoff state, the opening/closing will not be performed. The valve 50 communicates with the pilot discharge passage 56 upon the return operation of the direction control valve 10A, and the pressure control valve 30
The pilot passage 44 communicates with the discharge passage R4 via the pilot passage 54 and the pilot discharge passage 56, and the supply passage P
3. Switch P4 and P2 from the on-load state to the unload state.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In this invention, a pressure control valve is integrally connected to a plurality of mutually connected directional control valves. The present invention relates to a directional control valve device.

0002

[Conventional technology]

As this type of directional control valve device, the applicant has already filed Utility Application No. 2-229. There is something like FIG. 9 shown in No. 131. This directional control valve device has three directions. The control valves 1A, 1B, and 1C are connected to each other to form directional control valves 1A, 1B, and 1C. The supply flow paths P and each discharge flow path R are provided in communication with each other, and The two load channels A and B of the control valves 1A, 1B, and 1C are connected to fluid actuators, respectively. 2A, 2B, and 2C, and a pressure control valve 3 is connected to the direction control valve 1A at one end. The pressure control valve 3 is integrally connected to the supply flow path P and the discharge flow path R of the directional control valve 1A. The supply channel P1 and the discharge channel R1 are provided in communication with each other, and the pressure control valve 3 is connected to the valve body 4. The action chamber 5 formed on the back is connected to the switching valve body 6A, 6B of each direction control valve 1A, 1B, 1C, Each directional control valve 1A, 1B, 1C has one that can be freely communicated and shut off by sliding in the axial direction of 6C. Connected to the discharge channel R via pilot channels 7, 8, at least one directional control valve 1 When A, 1B, and 1C are in the switching position, pilot paths 7 and 8 are cut off and the supply is interrupted. While setting the flow paths P1 and P to the on-load state, all three directional control valves 1A and 1B , 1C is in the neutral position as the original position, the pilot paths 7 and 8 are communicated and are in service. The supply channels P1 and P are provided to be in an unloaded state. And each directional control valve 1A, 1B, and 1C control the operation of fluid actuators 2A, 2B, and 2C, respectively. I try to control it.

0003

[Problem that the idea aims to solve]

However, in the directional control valve device having such a configuration, at least one directional control valve 1A Or, if 1B and 1C are in the switching position, pilot paths 7 and 8 will be cut off and the supply flow will be interrupted. road P1 and P are on-road, and all three directional control valves 1A, 1B, and 1C are in the When in the upright position, pilot passages 7 and 8 are communicated, and supply passages P1 and P are unloaded. For example, switch the directional control valve 1A from the neutral position to the switching position. When the directional control valve 1A in this switching position is returned to the neutral position, the switching valve If the body 6A catches foreign matter in the fluid at the switching position and causes a sticking phenomenon, it will return to the neutral position. The pilot passages 7 and 8 remain blocked because they cannot slide back to the original position, and the pressure The control valve 3 can switch the supply channels P1 and P from an on-load state to an unload state. The pressure fluid in the supply channels P1 and P, which are in the on-load state, flows through the load channel A. continues to be introduced into the fluid actuator 2A, causing the fluid actuator 2A to run out of control. There was a problem with this, which was extremely dangerous.

0004 The present invention solves this problem by moving the directional control valve in the switching position to the original position. When returning to the original position, the switching valve body cannot return from the switching position to the original position. Safety is ensured by reliably switching the supply flow path from on-load state to unload state, even when The present invention provides a directional control valve device that can be improved.

[0005]

[Means to solve the problem]

Therefore, in the directional control valve device according to claim 1, the supply flow for supplying the pressure fluid is two load channels connected to the fluid actuator side and a discharge flow connected to the low pressure side. The switching valve body is slidably fitted inside the valve body having a passage and the switching valve body is placed in its original position. A directional control valve that can freely switch and communicate between each flow path by sliding in the axial direction from to the switching position. A plurality of directional control valves are installed between each supply flow path and between each discharge flow path. They are connected and connected to each other so that they communicate with each other, and the supply flow path and discharge flow path of this directional control valve are A supply flow path and a discharge flow path provided in the valve body of the pressure control valve are communicated with the flow path, respectively. A pressure control valve is provided integrally connected to a directional control valve via an on-off valve to control the pressure. The control valve places the supply flow path on-load in the switching position of at least one directional control valve. together with the valve body to unload the supply flow path at the original position of all directional control valves. A working chamber is formed on the back of the valve body housed inside the valve body in the axial direction of the switching valve body of each direction control valve. It is connected to the low pressure side through the pilot passage in each directional control valve, which can be freely disconnected by sliding. The on-off valve interposed between the pressure control valve and the direction control valve is connected to the pressure control valve and the direction control valve. A supply flow path and a discharge flow path that communicate between each supply flow path and each discharge flow path of the control valve, respectively. A pipe that communicates between the flow path and the working chamber of the pressure control valve and the pilot path of the directional control valve. The pilot exhaust that branches off from the lot path and this pilot path and connects to the low pressure side. The main body has an outlet passage, and there is at least one directional control valve inside the main body for switching from its original position. When switching to the position, the pilot discharge path is shut off and the direction at the switching position is Electromagnetic control that connects the pilot discharge path to the low pressure side when the control valve returns to its original position. It is equipped with a manufactured opening/closing valve body.

[0006] Further, in the directional control valve device according to claim 2, the pressure control valve according to claim 1 and Interposed between directional control valves to switch the supply flow path between on-load and unload states. The on-off valves are used to connect the pressure control valve and the direction control valve between each supply flow path and between each discharge flow path. The supply flow path and discharge flow path, as well as the action chamber of the pressure control valve and the directional control valve, communicate with each other. The pilot path that communicates between the pilot paths and the low pressure side branched from the supply flow path. The main body has a connecting passage connected to the main body, and at least one directional control valve is installed inside the main body. When switching from the original position to the switching position, the connecting flow path is cut off and the switch is placed at the switching position. An electromagnetically operated on-off valve that connects the connecting flow path when the directional control valve returns to its original position. It is made up of a body.

[0007]

[Effect]

In the configuration of the present invention, in the directional control valve device according to claim 1, the switching position is When the directional control valve is returned to its original position, the on-off valve body becomes the pilot. The discharge passage is connected to the low pressure side, and the pressure control valve has an action chamber on the back of the valve body that is connected to the pilot passage and the pipe. Unloads the supply flow path from the on-load state by communicating with the low pressure side via the lot discharge path. Switch to state. Further, in the directional control valve device according to claim 2, the directional control valve device is located at the switching position. When the directional control valve returns to its original position, the on-off valve body communicates with the connecting flow path. The supply flow path is connected to the low pressure side via the connection flow path, and the supply flow path is removed from the on-load state. Switch to download state. For this reason, both the directional control valve devices described in both claims, When returning a directional control valve that is in the switching position to its original position, the switching valve body is not in the switching position. The supply flow path can be reliably unloaded from the on-load state even if it cannot be returned to its original position. Safety can be improved by switching to the load state.

[0008]

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. In FIGS. 1 and 2, 10A, 10B, and 10C are three directional control valves, and the pressure Supply channel P2 that supplies force fluid and fluid actuators 11A, 11B, 11C side It has two load flow paths A2 and B2 that connect to the lower pressure side and a discharge flow path R2 that connects to the low pressure side. The valve bodies 13A, 13B, and 13C are connected and connected to each other in the vertical direction in FIG. The supply flow paths P2 and the discharge flow paths R2 are provided in communication with each other. 3 0 has a supply flow path P3 and a discharge flow path R3 in the valve body 31, and the supply flow path P3 is turned on. A pressure control valve that switches between a load state and an unload state. It is provided integrally connected to the directional control valve 10A at one end of 2, and the supply flow path P3 and the discharge The flow path R3 is communicated with the supply flow path P2 and the discharge flow path R2 of the directional control valve 10A, respectively. It is set up as follows. 51 is connected and connected to the directional control valve 10C at the other end of FIG. The side plate member has a discharge flow path R2 of the directional control valve 10C inside, which will be described in detail later. It has a flow path 59 that connects between the pilot paths 33. 52 is 4 bolts Three directional control valves 10A, 10B, 10C, and a pressure control valve 30 joined and connected with , an on-off valve 50, and a side plate member 51 are fixedly provided.

[0009] As shown in FIG. 3, the direction control valve 10A (the direction control valves 10B and 10C are also It has the same configuration as 10A. ) is the interval between each flow path P2, A2, B2, R2 in the axial direction. A fitting hole 14 having an opening is provided through the valve body 13A, and the switching valve body 1 is inserted into the fitting hole 14. 5 are slidably fitted in the axial direction. 16A and 16B are both valve bodies 13A Both end openings of the fitting hole 14 are closed with a lid member fixed to the side surface, and both ends of the switching valve body 15 are closed. Pilot chambers 17A and 17B are partitioned into each other. 18A and 18B are pilot The switching valve body 15 is moved to its original neutral position by the springs housed in the chambers 17A and 17B. It is designed to be retained. Pilot rooms 17A and 17B are equipped with pilots. Via channels 19A, 19B, 20A, 20B, 21A, 21B, 22A, 22B A pilot fluid is provided so that it can be freely introduced. 23A and 23B are pilot room 17 The pilot fluid pressure introduced into A and 17B is the current value applied to coils 24A and 24B. A pilot valve that controls the elevation according to the increase or decrease of There is. The pilot valves 23A and 23B are internally biased by springs 43A and 43B. It has pilot valve bodies 26A and 26B that are seated on seats 25A and 25B, and the pilot The pilot chamber 17A is opened by separating the valve bodies 26A and 26B from the valve seats 25A and 25B. , 17B to the pilot flow paths 27A, 27B, 28A, 28B, 29A, 29B so as to be freely dischargeable to the discharge flow path R2, and the pilot valve body 26A , 26B on the valve seats 25A, 25B can be freely adjusted according to the energizing current value. ing. Reference numerals 32 and 33 denote pads formed in the fitting hole 14 with annular depressions spaced apart from each other in the axial direction. At the pilot path, both pilot paths 32 and 33 are set at the neutral position of the switching valve body 15 shown in FIG. and the axial direction from the neutral position of the switching valve body 15 to the left-right switching position. It is provided so that the two pilot paths 32 and 33 are cut off by sliding in the opposite direction.

0010 As shown in FIG. 4, the pressure control valve 30 has a main valve body 3 as a valve body inside a valve body 31. 4 is housed so as to be slidable in the axial direction, and an action chamber 35 is defined at the back of the main valve body 34 for operation. The use chamber 35 receives a portion of the pressure fluid of the supply flow path P3 via the flow path 36 provided in the main valve body 34. is provided so that it can be freely introduced as a pilot fluid, and the main valve body 34 is connected inside the supply flow path P3 and the exhaust flow path P3. A spring 37 is housed therein which biases the outlet flow path R3 in the blocking direction. And the action chamber 35 A pilot path 44 is connected to. 38 is a pilot flow introduced into the action chamber 35 This is a pilot valve that sets body pressure to a set value, and is fixed to the valve body 31 and has a valve seat 3 inside. It has a pilot valve body 40 seated on the valve seat 39 of the pilot valve body 40. By separating the seat, the pilot fluid in the pilot chamber 35 can be freely discharged to the discharge flow path R3. , the force of the spring 41 is adjusted by the adjustment member 42, and the force of the pilot valve body 40 is applied to the valve seat 39. The seating force is adjustable. 45 is slidably fitted inside the valve body 31 The pressure reducing valve body uses a part of the pressure fluid in the supply flow path P3 as pilot fluid to open the flow path 46. The introduced pilot fluid is controlled to be depressurized and the pilot fluid is introduced through the pilot flow path 47. A, 47B.

[0011] As shown in FIG. 5, the on-off valve 50 includes a main body 53, a supply channel P4, a discharge channel R4, Separated from lot path 54, pilot flow paths 55A, 55B, and pilot path 54 It has a pilot discharge path 56 that branches off and connects to the discharge flow path R4. And figure 1, the supply passage P4 is the supply passage P4 of the pressure control valve 30 and the direction control valve 10A. 3, P2 is connected, and the discharge flow path R4 is connected between the discharge flow paths R3 and R2, and the pilot The to passage 54 communicates between the pilot passages 44 and 32, and the pilot passages 55A and 55B. communicates between the pilot channels 47A, 47B, 19A, and 19B. 57 is a book An on-off valve body is slidably housed inside the body 53, and an electromagnetic valve located on the back of the on-off valve body 57 The pilot discharge path 56 can be freely disconnected from communication by electromagnetic operation of energizing and de-energizing the device 58. It is set up in The on-off valve body 57 is connected to at least one directional control valve 10A or Pilot valve 23A is operated to switch 10B and 10C from the neutral position to the switching position. Or, when electricity is applied to 23B, the electromagnetic device 58 is energized and resists the force of the spring 59. 5 to the right in FIG. 5 to block the pilot discharge path 56 and move it to the switching position. A pyrotron controller is used to return the directional control valve 10A, 10B, or 10C to the neutral position. If the electromagnetic device 58 is de-energized due to de-energization to the shut valve 23A or 23B, 59 so as to return to the position shown in FIG. 5 and communicate with the pilot discharge passage 56. It is set up.

0012 Next, the operation of this configuration will be explained. When pressure fluid is supplied to the supply channel P3 in the state shown in the figure, each directional control valve 10A, 1 For 0B and 10C, the switching valve body 15 is held in the neutral position by the force of springs 18A and 18B. The flow paths P2, A2, B2, and R2 are blocked off, and the pilot paths 32 and 3 are The pilot chambers 17A and 17B at both ends of the switching valve body 15 are provided with pressure reducing valve bodies. The pilot fluid whose pressure is reduced by 45 flows through pilot flow paths 47A, 47B, 5 5A, 55B, 19A, 19B, 20A, 20B, 21A, 21B. is on, the pilot valves 23A and 23B are de-energized, and the pilot valve bodies 26A and 2 6B is seated on the valve seats 25A and 25B with the maximum seating force due to the force of springs 43A and 43B. to set the pilot fluid pressure in the pilot chambers 17A and 17B to the maximum, and open the on-off valve 5. 0, the electromagnetic device 58 is not energized and the on-off valve body 57 is connected to the pilot discharge path 56. The pressure control valve 30 has an action chamber 35 at the back of the main valve body 34 connected to the pilot passages 44 and 54. Pilot passages 32, 33 and flow passages 59 of each directional control valve 10A, 10B, 10C The pilot passage 54 communicates with the discharge passage R2 via the pilot passage R2. 56, the main valve body 34 resists the force of the spring 37. The supply flow path P3 slides to the left in FIG. 4 and communicates between the supply flow path P3 and the discharge flow path R3, P4 and P2 are set to the unloaded state, and each fluid actuator 11A, 11B, 11 C is stopped.

[0013] From this state, for example, the pilot valve 23A of one directional control valve 10A is energized. Then, an attractive force corresponding to the energizing current value acts on the pilot valve body 26A, and the pilot The seating force of the valve body 26A on the valve seat 25A is the value obtained by subtracting the suction force from the force of the spring 43A. As a result, the pilot fluid pressure in the pilot chamber 17A is controlled to decrease. Switching valve body 1 5 is the pilot of the pilot chamber 17B set to the highest level by the pilot valve 23B. Due to the acting force based on the fluid pressure and the lowered pilot fluid pressure in the pilot chamber 17A, From the neutral position to the left side in Figure 3 until the switching position where the acting force based on the base and the spring 18A force are balanced. 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. When the opening is set according to the current value flowing to the pilot valve 23A and switching is made, Both block the pilot paths 32 and 33. The on-off valve 50 is a part of the directional control valve 10A. When the pilot valve 23A is energized, the electromagnetic device 58 is energized and the opening/closing valve body 57 is opened. It slides to the right in FIG. 5 against the force of the spring 59 to block the pilot discharge path 56. pressure The force control valve 30 provides a shutoff between the pilot passages 32 and 33 as well as a pilot discharge passage 56. By shutting off, the pilot fluid in the action chamber 35 is discharged from the pilot passages 44 and 54. The main valve body 34 slides back to the position shown in FIG. 4 by the force of the spring 37, and the supply flow path P3 and discharge flow path R3, and supply flow paths P3, P4, and P2 are changed from the unloaded state to the Switch to the on-load state with the set pressure of the pilot valve 38. fluid actuator The pressure fluid in the supply flow paths P3, P4, and P2 that is in the on-load state is the load on the tank 11A. The fluid is introduced through the flow path A2 and is discharged from the load flow path B2 to the discharge flow path R2. The operation is controlled in the upward direction in FIG. At this time, the other two directional control valves 10B, 1 0C is held at a neutral position.

[0014] Then, if the value of current applied to the pilot valve 23A is increased, the pilot valve body 2 The seating force of valve 6A on valve seat 25A decreases and the pilot fluid pressure in pilot chamber 17A decreases. The force is further lowered, and the switching valve body 15 is controlled based on this lowered pilot fluid pressure. 3 until the switching position is balanced with the acting force, and slide further to the left in FIG. Increase the opening settings between A2 and between B2 and R2. Also, to the pilot valve 23A If the energizing current value is decreased, the seating force of the pilot valve body 26A on the valve seat 25A will increase. In addition, the pilot fluid pressure in the pilot chamber 17A is increased and the switching valve body 15 is 3 until the switching position is balanced with the acting force based on this increased pilot fluid pressure. slide to the right to decrease the opening settings between each channel P2 and A2 and between B2 and R2. Ru.

[0015] In this state, when the pilot valve 23A is de-energized, the pilot chamber 17A is The pilot fluid pressure is set to the maximum and the pilot fluid pressure in the pilot chamber 17B The pressure becomes the same as the force, and the switching valve body 15 slides back to the neutral position shown in Fig. 3 by the force of the spring 18A. to block the flow paths P2, A2, B2, and R2, and to block the pilot paths 32 and 33. communicate between. The on-off valve 50 de-energizes the pilot valve 23A of the directional control valve 10A. Accordingly, the electromagnetic device 58 is de-energized, and the opening/closing valve body 57 is operated as shown in FIG. 5 by the force of the spring 59. It slides back to the position and communicates with the pilot discharge passage 56. The pressure control valve 30 is the action chamber 3 5 is discharged and the main valve body 34 moves to the left in FIG. 4 against the force of the spring 37. to connect the supply flow path P3 and the discharge flow path R3 to connect the supply flow paths P3, P4, and P2. Switching from on-load state to unload state, fluid actuator 11A operates stop.

[0016] Moreover, when the pilot valve 23B of the directional control valve 10A is energized, the switching valve body 15 Slide to the right in Fig. 3, between supply flow path P2 and load flow path B2, and between load flow path A2 and exhaust flow path. Switch by setting the opening degree between the outlet flow path R2 according to the current value flowing to the pilot valve 23B. Through this communication, the fluid actuator 11A is controlled to move downward in FIG. At this time , similarly to the above, the on-off valve 50 shuts off the pilot discharge path 46, and the pressure control valve 30 closes off the pilot discharge path 46. The supply channels P3, P4, and P2 are switched from the unloaded state to the onloaded state. So Then, 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, and the on-off valve 50 discharges the pilot. The pressure control valve 30 connects the supply channels P3, P4, and P2 to the on-load state. Switch from to unload state.

[0017] Also, when the other directional control valve 10B or 10C is switched, the fluid actuator The operation of the controller 11B or 11C is controlled, and the three directional control valves 10A, 10B, 1 When all 0C are switched, fluid actuators 11A, 11B, and 11C operate. controlled by two directional control valves 10A, 10B or 10A, 10C or 10B , 10C, fluid actuators 11A, 11B or 11A, The operation of 11C or 11B and 11C is controlled.

[0018] With this operation, either the pilot valves 23A or 23B are energized to switch to the switching position. De-energize the pilot valve 23A or 23B of the directional control valve 10A located at the When the on-off valve 50 is operated to return to the neutral position, the on-off valve 50 is activated by the pilot valve 23A or 23. With the de-energization of B, the electromagnetic device 58 is de-energized and the opening/closing valve body 57 is closed to the pilot exhaust. In order to communicate the outlet passage 56, the directional control valve 10A in the switching position is operated to return to the neutral position. When the switching valve body 15 is in the switching position, it may catch foreign objects in the fluid and cause them to stick. An error occurred and the slide could not be returned to the neutral position, and the pilot path between 32 and 33 was cut off. Even if the pressure control valve 30 remains in this state, the pressure control valve 30 is operated by the pyrotron in the action chamber 35 on the back of the main valve body The cut fluid flows from the pilot passages 44 and 54 to the discharge passage via the pilot discharge passage 56. Since it can be discharged to R4, the supply channels P3, P4, and P2 can be reliably removed from the on-load state. It is possible to switch to the unloaded state and improve safety. In addition, the on-off valve 5 0 is interposed between the direction control valve 10A and the pressure control valve 30 and connected to each other, so it cannot be opened. No special piping is required to connect the flow path to the closing valve 50, and it can be easily installed. It is possible to achieve compactness. Furthermore, it is housed inside the main body 53 of the on-off valve 50. The on-off valve body 57 communicates with a pilot discharge passage 56 through which a small flow of pilot fluid flows. It is sufficient to use a small-sized device that shuts off, and it is possible to satisfactorily suppress the increase in size of the entire device.

[0019] 6 to 8 show other embodiments of the present invention, and the same members as in one embodiment are designated by the same reference numerals. Only the different parts will be explained. Between the pressure control valve 30 and the direction control valve 10A The intervening on-off valve 60 connects the main body 61 with a supply passage P5, a discharge passage R5, and a pilot passage. 62, a discharge flow branched from the pilot flow paths 63A, 63B and the supply flow path P5 It has a connection passage 64 connected to passage R5, and supply passage P5 is connected to pressure control valve 30 and direction control. The supply passages P3 and P2 of the control valve 10A are connected to each other, and the discharge passage R5 is connected to the discharge passages R3 and R. The pilot path 62 communicates between the pilot paths 44 and 32, and the pilot path 62 communicates between the pilot paths 44 and 32. The pilot channels 63A and 63B are connected between the pilot channels 47A, 47B, 19A, and 19B. It's communicating. 65 is an on-off valve body housed inside the main body 61, and is located on the back of the on-off valve body 65. The connection flow path 64 is cut off by electromagnetic operation of energizing and de-energizing the arranged electromagnetic device 66. It is set up freely. The on-off valve body 65 is connected to at least one directional control valve 10A or or pilot valve 2 to switch 10B and 10C from the neutral position to the switching position. When 3A or 23B is energized, the electromagnetic device 66 is energized and resists the force of the spring 67. and slide it to the left in FIG. 8 to block the connecting flow path 64, and also Pilot to return control valve 10A, 10B, 10C to neutral position. When the valve 23A or 23B is de-energized, the electromagnetic device 66 is de-energized and the spring 6 is de-energized. 7. The connecting flow path 64 is provided so as to be slid back to the position shown in FIG. 8 by force.

[0020] Next, the operation will be explained. In the state shown in the figure, when pressure fluid is supplied to the supply channel P3, each directional control valve 10A, 10B and 10C are held at neutral positions to block each flow path P2, A2, B2, and R2. and communicates between the pilot passages 32 and 33, and the pressure control valve 30 is connected to the pilot passages 32 and 33. The pilot path 44 is the pilot path 62 and the pilot path of each directional control valve 10A, 10B, 10C. The supply channel P is connected to the discharge channel R2 via the channels 32 and 33 and the channel 59. 3 and the discharge flow path R3 are communicated with each other. Further, the on-off valve 60 is not connected to the electromagnetic device 66. An on-off valve body 65 communicates with the connecting flow path 64 . This allows the supply flow path P3, P5, and P2 are in the unloaded state, and the fluid actuators 11A and 11B , 11C are stopped.

[0021] From this state, for example, the pilot valve 23A of one directional control valve 10A is energized. Then, the directional control valve 10A operates 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 is set to the opening degree according to the current value flowing to the pilot valve 23A. The pilot passages 32 and 33 are switched and communicated with each other, and the pressure control valve 30 is connected to the pilot passages 32 and 33. By blocking the lot paths 32 and 33, the supply channel P3 and the discharge channel R3 are blocked. The on-off valve 60 is an electromagnetic device when the pilot valve 23A of the directional control valve 10A is energized. 66 is energized, the on-off valve body 65 slides to the left in FIG. 8 against the force of the spring 67 and comes into contact. The follow-on flow path 64 is cut off. As a result, the supply channels P3, P5, and P2 are in an unloaded state. The state changes from the state to the on-road state, and the fluid actuator 11A moves upward in FIG. Operation controlled.

[0022] From this state, when the pilot valve 23A is de-energized, the directional control valve 10A 6 and slides back to the neutral position, blocking each flow path P2, A2, B2, and R2, and It communicates between Ilot roads 32 and 33. The pressure control valve 30 has pilot paths 32 and 33 The supply flow path P3 and the discharge flow path R3 are communicated by the communication between them. The on-off valve 60 is a pi As the lot valve 23A is de-energized, the electromagnetic device 66 is de-energized and the opening/closing valve body 65 is de-energized. is slid back to the position shown in FIG. 8 by the force of the spring 67, and communicates with the connection channel 64. This is it , the supply channels P3, P5, and P2 switch from the on-load state to the unload state. , the fluid actuator 11A stops operating.

[0023] Also, when the pilot valve 23B of the directional control valve 10A is energized, the fluid actuator The directional control valve 11A is controlled to operate downward in FIG. When the switching operation is performed, the operation of the fluid actuator 11B or 11C is controlled, and the three When all directional control valves 10A, 10B, and 10C are switched, the fluid actuator 11A, 11B, 11C are operated and the two directional control valves 10A, 10B or When switching 10A, 10C or 10B, 10C, the fluid actuator The operation of 11A, 11B or 11A, 11C or 11B, 11C is controlled.

[0024] With this operation, the directional control valve 10A in the switching position is switched to the pilot valve 23A or When 23B is de-energized and returned to the neutral position, the on-off valve 60 becomes the pilot valve. When 23A or 23B is de-energized, the electromagnetic device 66 is de-energized and the opening/closing valve body is turned off. 65 communicates with the connecting flow path 64, the directional control valve 10A in the switching position is set to the neutral position. When returning to the neutral position, the switching valve body cannot return from the switching position to the neutral position. The pressure control valve 30 closes the supply flow path P3 while the pilot paths 32 and 33 remain cut off. Even if it becomes impossible to communicate between Since the body can be discharged to the discharge channel R5 via the connecting channel 64, the supply channels P3 and P5 , P2 can be reliably switched from on-load state to unload state, improving safety. can do. Moreover, the on-off valve 60 is located between the direction control valve 10A and the pressure control valve 30. Because they are interposed and connected, special piping is required to connect the flow path to the on-off valve 60. It is not necessary and can be easily installed and made compact. moreover, In the unloaded state, the pressure fluid in the supply channels P3, P5, and P2 is separated from the pressure control valve 30. Since it can be discharged to the discharge flow path R5 via the connection flow path 64 of the on-off valve 60, the unloading The pressure in the supply channels P3, P5, and P2 in the It can be reduced satisfactorily.

[0025]

[Effect of the idea]

In this way, the directional control valve device according to claim 1 has a pressure control valve and a directional control valve. The on-off valves interposed between the pressure control valve and the direction control valve are connected between each supply flow path and each discharge flow path. The supply flow path and discharge flow path that communicate between the paths, as well as the action chamber and direction of the pressure control valve. Pilot path that communicates between pilot paths of control valves and from this pilot path The main body has a pilot discharge passage that branches and connects to the low pressure side, and there is a small Pilot discharge occurs when one directional control valve is switched from its original position to its switching position. When the directional control valve in the switching position returns to its original position, the piping is interrupted. It is equipped with an electromagnetically operated on-off valve body that communicates the lot discharge path with the low pressure side. In the directional control valve device according to claim 2, the opening/closing valve interposed between the pressure control valve and the directional control valve The valves are connected between each supply flow path and between each discharge flow path of the pressure control valve and the direction control valve. The supply flow path and discharge flow path as well as the working chamber of the pressure control valve and the pilot valve of the directional control valve. Connects to the low pressure side by branching from the pilot path and supply flow path that communicate between the two paths. The main body has a connecting passage, and there is at least one directional control valve inside the main body from its original position. When switching to the switching position, the connecting flow path is blocked and the direction control at the switching position is performed. Contains an electromagnetically operated opening/closing valve body that communicates the connecting flow path when the valve returns to its original position. The directional control valve devices recited in both claims are based on the directional control valve in the switching position. When returning to the position, the switching valve body cannot return to the original position from the switching position. The supply flow path can be reliably switched from the on-load state to the unload state even when In addition to improving performance, it is possible to connect the flow path to the on-off valve by connecting the on-off valve. Easy to install and compact without requiring special piping for installation. be able to.

[0026] Furthermore, in the directional control valve device according to claim 1, a The on-off valve body is a small valve that blocks communication with the pilot discharge path through which a small flow of pilot fluid flows. It may be of the type, and has the effect of effectively suppressing the increase in size of the entire device. Also, request In the directional control valve device according to claim 2, the pressure fluid in the supply flow path is pressurized in the unloaded state. Separately from the force control valve, it can be discharged to the low pressure side via the connection flow path of the on-off valve, so it is easy to unload. The effect of successfully reducing the pressure in the supply flow path in a closed state without being affected by the pressure control valve has.

[Brief explanation of drawings]

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

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

FIG. 3 is an enlarged sectional view taken along line A-A in FIG. 2;

FIG. 4 is an enlarged cross-sectional view taken along line BB in FIG. 2;

FIG. 5 is an enlarged cross-sectional view taken along line CC in 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 cross-sectional view taken along line DD in FIG. 7;

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

[Explanation of symbols]

10A, 10B, 10C directional 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 route 34 main valve body 35 action chambers 50, 60 on-off valve 53, 61 main body 56 pilot discharge passage 57, 65 open/close valve body 64 connection channels P2, P3, P4, P5 supply flow path A2, B2 load flow path R2, R3, R4, R5 discharge flow path

Claims (2)

[Scope of utility model registration request] Claim 1: A switching valve element is slid inside a valve body having a supply passage for supplying pressure fluid, two load passages connected to the fluid actuator side, and a discharge passage connected to the low pressure side. A plurality of directional control valves are provided that are movably fitted to each other so that each flow path can be freely switched and communicated by sliding the switching valve body in the axial direction from the original position to the switching position. The supply channels and the discharge channels are connected and connected to each other so as to communicate with each other, and the supply channel and the discharge channel of the directional control valve are connected to the supply channel provided in the valve body of the pressure control valve. The pressure control valve is integrally connected to the directional control valve via an on-off valve so as to communicate with the discharge flow path, and the pressure control valve is connected to the supply flow path at the switching position of at least one directional control valve. Switching of each directional control valve is performed using an action chamber formed on the back of the valve body housed inside the valve body so that the supply flow path is placed in the on-load state and the supply flow path is unloaded in the original position of all directional control valves. The opening/closing valve interposed between the pressure control valve and the direction control valve is connected to the low pressure side via the pilot path provided in each direction control valve so that communication can be cut off or disconnected by sliding in the axial direction of the valve body. A supply flow path and a discharge flow path that communicate between each supply flow path and each discharge flow path of the control valve, a pilot path that communicates between the action chamber of the pressure control valve and the pilot path of the directional control valve, and from this pilot path. The main body has a pilot discharge passage that branches off and connects to the low pressure side, and when at least one directional control valve is switched from the original position to the switching position, the pilot discharge passage is shut off and the switching position is changed. A directional control valve device that houses an electromagnetically operated opening/closing valve body that communicates a pilot discharge path with a low pressure side when the directional control valve returns to its original position. [Claim 2] A switching valve body is slid inside a valve body having a supply channel for supplying pressure fluid, two load channels connected to the fluid actuator side, and a discharge channel connected to the low pressure side. A plurality of directional control valves are provided that are movably fitted to each other so that each flow path can be freely switched and communicated by sliding the switching valve body in the axial direction from the original position to the switching position. The supply channels and the discharge channels are connected and connected to each other so as to communicate with each other, and the supply channel and the discharge channel of the directional control valve are connected to the supply channel provided in the valve body of the pressure control valve. The pressure control valve is integrally connected to the directional control valve via an on-off valve so as to communicate with the discharge flow path, and the pressure control valve is connected to the supply flow path at the switching position of at least one of the directional control valves. Switching of each directional control valve is performed using an action chamber formed on the back of the valve body housed inside the valve body so that the supply flow path is placed in the on-load state and the supply flow path is unloaded in the original position of all directional control valves. The opening/closing valve interposed between the pressure control valve and the direction control valve is connected to the low pressure side via the pilot path provided in each direction control valve so that communication can be cut off or disconnected by sliding in the axial direction of the valve body. From the supply flow path and discharge flow path that communicate between each supply flow path of the control valve and between each discharge flow path, and the pilot path and supply flow path that communicate between the action chamber of the pressure control valve and the pilot path of the directional control valve. The main body has a connecting flow path that branches and connects to the low pressure side, and inside this main body, when at least one directional control valve is switched from the original position to the switching position, the connecting flow path is shut off and the switching position is changed. A directional control valve device comprising an electromagnetically operated opening/closing valve body that communicates a connecting flow path when the directional control valve is returned to its original position.