JP5791351B2 - Compound solenoid valve - Google Patents

Description

The present invention relates to a mounting structure of the micro switch, in particular, about the composite electromagnetic switching valve which two of the main valve to switch換連communication between chambers arranged in parallel in the valve body of the supply chamber and the load chamber and the discharge chamber.

  Conventionally, in a microswitch mounting structure used for a composite electromagnetic switching valve in which two main valves for switching communication between a supply chamber, a load chamber, and a discharge chamber are arranged in parallel in a valve body, Patent Document 1 discloses. As is the case, a microswitch is mounted in a terminal box as a fixing member provided at the lower part of the valve body.

  That is, two substantially conical dogs formed of elastic rubber material are arranged in the terminal box, and the two dogs are respectively moved integrally with the valve body. Two micro switches are attached to the inside of the terminal box corresponding to both valve bodies, a roller provided at the tip of the lever of the micro switch is brought into contact with the dog, and both valve bodies that reciprocate are moved. It is detected and the switching operation of both valve bodies is confirmed.

Japanese Utility Model Publication No. 63-25619

  In such a conventional microswitch mounting structure, the microswitch is fixed to the terminal box with two bolts or the like when the microswitch is fixed at the detection position where the dog and the roller contact to detect the movement of the valve body. However, since there are assembly errors, processing errors, etc., adjustment is made so that the fixed position of the microswitch becomes the detection position. However, during this adjustment, the microswitch must be adjusted and fixed to the terminal box in the direction of movement of the valve body and the direction perpendicular to the direction of movement, and there is a problem that it takes time to install the microswitch. It was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite electromagnetic switching valve including a microswitch mounting structure that can easily adjust the microswitch mounting.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In the microswitch mounting structure in which the microswitch that detects the axial movement of the moving member in contact with the dog provided on the moving member that reciprocates in the axial direction is disposed on the fixed member.
The micro switch is attached to the swing member, and the swing member is swingable about the fulcrum pin substantially orthogonal to the axial direction of the moving member, and the fulcrum of the swing member is fixed to the fixed member. This is a composite electromagnetic switching valve including a microswitch mounting structure in which the detection position due to contact between the dog and the microswitch can be adjusted in the axial direction by swinging around the pin.

  In this case, the dog may be substantially conical, and the dog and the fulcrum pin may be provided at substantially the same position in the axial direction of the moving member. The fulcrum pin may be arranged on the opposite side of the microswitch with respect to the dog.

  In the microswitch mounting structure of the present invention, since the swinging member to which the microswitch is mounted is disposed so as to be swingable around the fulcrum pin, the detection position can be adjusted by swinging the swinging member. There is an effect that the mounting adjustment can be easily performed.

  Further, by providing the dog and the fulcrum pin at substantially the same position in the axial direction of the moving member, when the swinging member is swung, the detection position changes in the axial direction of the moving member and changes in the direction perpendicular to the axial direction. Can be adjusted easily. By disposing the fulcrum pin on the opposite side of the micro switch with respect to the dog, the distance between the fulcrum pin and the contact position of the dog can be appropriately secured.

It is sectional drawing of the composite solenoid valve to which the attachment structure of the microswitch as one Embodiment of this invention is applied. It is operation | movement explanatory drawing in case the movement of both the moving members of the attachment structure of the microswitch of this embodiment is simultaneous. It is operation | movement explanatory drawing when the movement of both the moving members of the attachment structure of the microswitch of this embodiment differs. It is explanatory drawing of adjustment by the attachment structure of the microswitch of this embodiment. It is sectional drawing of the composite solenoid valve to which the attachment structure of the microswitch as 2nd Embodiment is applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a main valve body, and two main valves a and b are incorporated in the main valve body 1. The main valve body 1 includes a supply chamber 2 connected to a supply passage P for supplying compressed air as pressure fluid therein, and a brake cylinder of a press machine as a fluid actuator (not shown) via a load passage A. The connected load chamber 4 and the discharge chamber 6 connected to the atmosphere as the low pressure side via the discharge flow path E are stacked in the main valve body 1 in the vertical direction in FIG. A silencer (not shown) is attached to the discharge channel E in order to achieve a silencing effect when discharging to the atmosphere.

  The main valve body 1 is formed with two sliding holes 8 and 10 communicating with the discharge chamber 6 from the upper end side, and the discharge chamber 6 and the load chamber 4 communicate with each other on the same axis. Communication holes 12 and 14 are formed. Further, through holes 16 and 17 are formed on the same axis as the sliding holes 8 and 10 so as to communicate the load chamber 4 and the supply chamber 2.

  Discharge valve seats 18 and 19 are formed on the discharge chamber 6 side of the communication holes 12 and 14, and supply valve seats 20 and 22 are formed on the supply chamber 2 side of the through holes 16 and 17. Piston members 24 and 26 are slidably inserted into the sliding holes 8 and 10, respectively. The piston members 24 and 26 are provided with discharge valve bodies 28 and 30 on the discharge valve seats 18 and 19 side, respectively. Yes. Rod members 32 and 34 are fitted to the piston members 24 and 26 through the discharge valve bodies 28 and 30. The rod members 32, 34 extend so as to reach the through holes 16, 17 through the communication holes 12, 14 and the load chamber 4.

  In the supply chamber 2, supply valve bodies 36 and 38 are arranged opposite to the supply valve seats 20 and 22, and communicate with the supply chamber 2 coaxially with the sliding holes 8 and 10. The fitting holes 40 and 42 opened in the lower end surface of the are formed. Plug members 44 and 46 are fitted in the fitting holes 40 and 42, respectively, and coil springs 48 and 50 are interposed between the supply valve bodies 36 and 38 and the plug members 44 and 46, respectively. The supply valve bodies 36 and 38 are urged in the seating direction on the supply valve seats 20 and 22.

  Both rod members 32, 34 are integrally provided with moving members 52, 54 that pass through the supply valve bodies 36, 38 and plug members 44, 46 and project airtightly from the main valve body 1. The piston members 24 and 26, the rod members 32 and 34, and the moving members 52 and 54 may be formed integrally, and the discharge valve bodies 28 and 30 and the supply valve bodies 36 and 38 may be formed integrally. Good.

  Both main valves a and b are provided in parallel in a circuit so as to individually switch and communicate between the chambers 2, 4, and 6, and communicate between the load chamber 4 and the discharge chamber 6 to communicate with the load chamber 4. Each has a discharge position for blocking between the supply chamber 2 and a supply position for connecting between the load chamber 4 and the supply chamber 2 and blocking between the load chamber 4 and the discharge chamber 6.

  A pilot solenoid valve body 56 is attached to the upper end surface of the main valve body 1, and the sliding holes 8 and 10 are closed. The chambers 58 and 60 are defined by the sliding holes 8 and 10, the piston members 24 and 26, and the pilot solenoid valve body 56, respectively.

  The pilot solenoid valve main body 56 incorporates two pilot solenoid valves c and d. The pilot solenoid valve main body 56 has pilot supply passages 62 and 64 for supplying a pilot fluid, and working chambers 58 and 60. Pilot load paths 66 and 68 to be connected and pilot discharge paths 70 and 72 to be opened to the atmosphere are formed. Both pilot supply paths 62 and 64 are connected to the supply chamber 2 via the communication path 73.

  The pilot solenoid valve main body 56 is provided with control chambers 74 and 76 communicating with the pilot supply passages 62 and 64, the pilot load passages 66 and 68, and the pilot discharge passages 70 and 72. The movable iron cores 78 and 80 slidably accommodated are biased in a direction away from the fixed iron cores 86 and 88 by the elastic force of the springs 82 and 84.

  In the non-energized state shown in FIG. 1, the pilot solenoid valves c and d are energized by the movable cores 78 and 80 by the springs 82 and 84 to close the pilot supply paths 62 and 64 and the pilot load paths 66 and 68 and the pilot. The movable iron core 78 is communicated with the discharge passages 70 and 72 to discharge the pilot fluid in the working chambers 58 and 60 to the atmosphere and set both the main valves a and b to the discharge position, or in the energized state shown in FIG. , 80 are attracted by the fixed iron cores 86, 88 against the elastic force of the springs 82, 84 to close the pilot discharge passages 70, 72 and communicate between the pilot supply passages 62, 64 and the pilot load passages 66, 68. Thus, the pilot fluid is introduced into the working chambers 58 and 60 so that both the main valves a and b are set to the supply position, and the both main valves a and b are provided so as to be separately movable between the discharge position and the supply position.

  A terminal box 90 is attached to the lower end surface of the main valve body 1 with a plurality of screws 91. The terminal box 90 is formed in a hollow shape and closes one side surface in FIG. A lid member (not shown) is provided, and the lid member is detachably screwed.

  The terminal box 90 is formed with fitting holes 92 and 94 that open to the main valve main body 1 side, and the plug holes 44 and 46 are partly fitted into the fitting holes 92 and 94 so that the main valve main body is fitted. 1 and the terminal box 90 are positioned.

  Moving members 52 and 54 projecting airtightly from the main valve body 1 are extended to the inside of the terminal box 90. Dogs 96 and 98 are attached to the ends of the moving members 52 and 54 in the terminal box 90, respectively. The dogs 96 and 98 are formed in a substantially conical shape, and are attached to the moving members 52 and 54 so that the conical surfaces of the dogs 96 and 98 are reduced in diameter toward the main valve body 1 side. The dogs 96 and 98 are made of an elastic rubber material or the like.

  Corresponding to the dogs 96 and 98, micro switches 100 and 102 are provided in the terminal box 90. The micro switches 100 and 102 are provided with rotatable rollers 100a and 102a at the end of the lever, and the rollers 100a and 102a. It is a well-known one that opens and closes contacts when is pressed. The contact configuration of the microswitches 100 and 102 may be a so-called a contact, b contact, or c contact, and may be selected as necessary.

  The micro switches 100 and 102 are attached to the swing members 104 and 106 by a plurality of screws 108 and 110, respectively. The swing members 104 and 106 are fitted so as to be swingable around fulcrum pins 112 and 114 provided in the terminal box 90, and the fulcrum pins 112 and 114 are orthogonal to the axial direction of the moving members 52 and 54. Standing up.

  The fulcrum pins 112 and 114 are provided at substantially the same positions as the dogs 96 and 98 in the axial direction of the moving members 52 and 54, and the fulcrum pins 112 and 114 are opposite to the micro switches 100 and 102 with respect to the dogs 96 and 98. Is arranged. That is, the micro switches 100 and 102 are disposed between the dogs 96 and 98 and the fulcrum pins 112 and 114.

  Since the main valve body 1 and the terminal box 90 are positioned at the time of assembly by fitting the plug members 44 and 46, the fulcrum pins 112 and 114 of the terminal box 90 with respect to the center of the moving direction of the moving members 52 and 54 are arranged. The position can be secured by machining in advance.

  The swinging members 104 and 106 have elongated holes 116 and 118 formed on the opposite side of the fulcrum pins 112 and 114 with the micro switches 100 and 102 interposed therebetween. It is formed in an arc shape centering on 114. The swing members 104 and 106 are fixed by screws 120 and 122 inserted into the elongated holes 116 and 118 and screwed into the terminal box 90. A terminal block 124 is disposed in the terminal box 90, and lead wires from the micro switches 100 and 102 and the pilot electromagnetic valves c and d, wiring from the outside, and the like are connected.

  When adjusting the detection position where the contact of the micro switch 100 on the main valve a side in the terminal box 90 is opened and closed, the piston member 24, the discharge valve body 28, the rod member 32, the supply valve body 36, the moving member 52, the dog 96 is moved in the axial direction, the discharge valve body 28 is separated from the discharge valve seat 18, and the supply valve body 36 is also moved to an intermediate operation position separated from the supply valve seat 20. The main valve a is positioned between the discharge position and the supply position, and this position is set as the detection position of the micro switch 100.

  Then, as shown in FIG. 4, the swing member 104 is swung around the fulcrum pin 112 so that the roller 100a of the micro switch 100 depresses the dog 96 and the contact of the micro switch 100 is switched. .

  Since the roller 100a of the micro switch 100 moves in the axial direction of the moving member 52 by swinging around the fulcrum pin 112 of the swing member 104, adjustment is possible by swinging around the fulcrum pin 112. Adjustment is easy because it can be adjusted by moving in one direction by swinging. At the time of adjustment, a buzzer or a lamp that operates in response to the opening / closing of the contacts may be connected to the micro switch 100 to notify that the micro switch 100 has been switched at the detection position.

  In the present embodiment, the fulcrum pin 112 is located at substantially the same position with respect to the moving direction of the moving member 52 with respect to the dog 96. When the rocking member 104 is swung around the fulcrum pin 112, the roller 100a of the micro switch 100 moves in an arc shape. However, since the fulcrum pin 112 and the dog 96 are in substantially the same position, the moving component is The component in the direction substantially the same as the moving direction of the member 52 is main, the component in the direction orthogonal to the axial direction of the moving member 52 is small, and adjustment is easy. The same applies to the adjustment of the micro switch 102 of the other main valve b.

  Next, the operation of the composite electromagnetic switching valve of this embodiment described above will be described. FIG. 1 shows the non-energized state of both pilot solenoid valves c and d. The two main valves a and b are urged by the elastic force of the springs 48 and 50 and switched to the discharge position in the upward direction of FIG. The supply valve bodies 36 and 38 are seated on the supply valve seats 20 and 22, and the discharge valve bodies 28 and 30 are separated from the discharge valve seats 18 and 19.

  Since the load chamber 4 and the discharge chamber 6 communicate with each other and are switched to a discharge position where the load chamber 4 and the supply chamber 2 are blocked, the compressed air of the brake cylinder of the press machine connected to the load chamber 4 Is silenced by the silencer from the discharge chamber 6 and discharged to the atmosphere.

  At this time, the moving members 52 and 54 are urged upward in FIG. 1 by the elastic force of the springs 48 and 50 and are in contact with the lower ends of the rod members 32 and 34 in the axial direction. The dogs 96 and 98 are in a state where the rollers 100a and 102a of the micro switches 100 and 102 are pressed.

  When the pilot solenoid valves c and d are both energized from the discharge position and the pilot solenoid valves c and d are operated, a part of the compressed air in the supply chamber 2 serves as a pilot fluid from the communication path 73 to the pilot supply path 62, 64, the control chambers 74 and 76, and the pilot load paths 66 and 68 are introduced into the working chambers 58 and 60.

  As shown in FIG. 2, the main valves a and b are opposed to the elastic force of the springs 48 and 50 by the acting force based on the pressure of the pilot fluid introduced into the working chambers 58 and 60. Together with the discharge valve bodies 28 and 30, the rod members 32 and 34, the supply valve bodies 36 and 38, and the moving members 52 and 54, they move downward in FIG.

  The supply valve bodies 36 and 38 are separated from the supply valve seats 20 and 22, and the discharge valve bodies 28 and 30 are seated on the discharge valve seats 18 and 19, and the load chamber 4 and the supply chamber 2 communicate with each other. The space between the chamber 4 and the discharge chamber 6 is blocked. For this reason, the compressed air in the supply chamber 2 is supplied from the load chamber 4 to the brake cylinder of the press machine.

  Further, by switching the main valves a and b to the supply position, the dogs 96 and 98 move together with the moving members 52 and 54 downward in the figure, and the rollers 100a and 102a of the micro switches 100 and 102 are pressed by the dogs 96 and 98. Is released. Therefore, the opening and closing of the contacts in the microswitches 100 and 102 are switched at the detection position, the movement of the two moving members 52 and 54 in the axial direction is detected, and both the main valves a and b are switched to the supply position. Is detected.

  When the pilot solenoid valves c and d are operated with both the pilot solenoid valves c and d de-energized in the state of being switched to the supply position, the piston members 24 and 26, the discharge valve bodies 28 and the two main valves a and b are operated. 30, the rod members 32 and 34, the supply valve bodies 36 and 38, and the moving members 52 and 54 move upward in FIG. 2 and return to the discharge position in FIG. The micro switches 100 and 102 detect that the rollers 100a and 102a are pressed by the movement of the dogs 96 and 98, the contact opening / closing is switched at the detection position, and both the main valves a and b are switched to the discharge position.

  Next, a case will be described in which either one of the pilot solenoid valves c and d fails and does not operate. In the state of FIG. 1, when both pilot solenoid valves c and d are energized and only the pilot solenoid valve d is operated, the state of FIG. 3 is obtained, and one main valve a maintains the state of the discharge position of FIG. The piston member 26, the discharge valve body 30, the rod member 34, the supply valve body 38, and the moving member 54 of the main valve b are all moved downward in FIG. 3 and switched to the supply position.

  However, although the supply chamber 2 and the load chamber 4 are communicated by the main valve b, the communication between the load chamber 4 and the discharge chamber 6 is maintained by the main valve a, and the press machine connected to the load chamber 4 from the supply chamber 2 is maintained. The supply of compressed air to the brake cylinder is suppressed, preventing malfunction of the brake cylinder. One micro switch 100 corresponding to one main valve a is maintained without switching the contact opening and closing, and the other micro switch 102 corresponding to the other main valve b is switched opening and closing the other contact. By detecting that only the main valve b is moved to the supply position, it is possible to confirm the malfunction with an external device.

  Next, a description will be given of an operation in which either one of the main valves a and b is delayed and a time phase is generated in the movement of both the main valves a and b. In the state of FIG. 1, when both pilot solenoid valves c and d are energized and both main valves a and b move downward in FIG. 1, for example, foreign matter between the main valve body 1 and one piston member 24 The movement resistance in the downward direction in FIG. 1 increases due to the biting of the other piston member, and one piston member 24 moves downward in FIG. 1 after the other piston member 26 moves in the downward direction in FIG. When a target phase occurs, the detection of one microswitch 100 is performed later than the detection of the other microswitch 102, and the time phase detected by both microswitches 100 and 102 is detected by an external device to check for malfunction. it can.

Next, a second embodiment different from the above-described embodiment will be described with reference to FIG. In addition, about the same member as embodiment mentioned above, the same number is attached | subjected and detailed description is abbreviate | omitted.
In the second embodiment, the positions of the fulcrum pins 112 and 114 of the swing members 104 and 106 to which the micro switches 100 and 102 of the above-described embodiment are attached are different. In the second embodiment, both swinging members 126 and 128 to which the micro switches 100 and 102 are attached are supported so as to be swingable around the fulcrum pins 132 and 134, respectively.

  The fulcrum pins 132 and 134 are provided in the vicinity of the lower extension of the inclined surface of the substantially conical dogs 96 and 98, and are provided on the opposite side of the dogs 96 and 98 with the microswitches 100 and 102 therebetween. . Arc-shaped elongated holes 136 and 138 around the fulcrum pins 132 and 134 are formed in the swing members 126 and 128, respectively. The long holes 136 and 138 are formed in the vicinity of the dogs 96 and 98, and are fixed by screws 140 and 142 inserted into the long holes 136 and 138 and screwed into the terminal box 90.

  As in the above-described embodiment, the screws 140 and 142 are loosened to swing the swinging members 126 and 128, and the detection positions of the microswitches 100 and 102 are adjusted. Adjustment is easy because it can be adjusted by moving in one direction by swinging.

  In the case of the second embodiment, when the swinging members 126 and 128 are swung around the fulcrum pins 132 and 134, the rollers 100a and 102a of the microswitches 100 and 102 are arcuate around the fulcrum pins 132 and 134. Therefore, the contact position between the rollers 100a and 102a and the dogs 96 and 98 moves in the axial direction of the moving members 52 and 54, and also moves in the direction orthogonal to the axial direction.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

A ... Load flow path E ... Discharge flow path P ... Supply flow path a, b ... Main valve c, d ... Pilot solenoid valve 1 ... Main valve body 2 ... Supply chamber 4 ... Load chamber 6 ... Discharge chamber 18, 19 ... Discharge Valve seats 20, 22 ... Supply valve seats 24, 26 ... Piston members 28, 30 ... Discharge valve bodies 32, 34 ... Rod members 36, 38 ... Supply valve bodies 44, 46 ... Plug members 52, 54 ... Moving members 56 ... Pilots Electromagnetic valve main body 58, 60 ... Working chamber 78, 80 ... Movable iron core 86, 88 ... Fixed iron core 90 ... Terminal box 92, 94 ... Fitting hole 96, 98 ... Dog 100, 102 ... Micro switch 100a, 102a ... Roller 104, 106, 126, 128 ... swing members 112, 114, 132, 134 ... fulcrum pins 116, 118, 136, 138 ... elongated holes

Claims (3)

A main valve body having a main valve movable between a position for supplying the pressure fluid to the fluid actuator and a position for discharging the pressure fluid;
A fixing member attached to the main valve body;
A moving member connected to the main valve and reciprocating in the axial direction;
A micro switch having a roller in contact with a substantially conical dog provided on the moving member, and detecting axial movement of the moving member;
A swinging member to which the microswitch is attached, and a swinging member disposed on the fixed member so as to be swingable about a fulcrum pin substantially orthogonal to the axial direction of the moving member;
A screw for fixing the swing member to the fixing member;
The swing member is disposed on the fixed member so that the detection position by contact between the dog and the roller can be adjusted in the axial direction by swinging around the fulcrum pin,
The dog, the fulcrum pin and the roller are provided at substantially the same position in the axial direction of the moving member,
Furthermore, in the axial direction of the moving member, the screw is disposed on the opposite side to the main valve with respect to the dog, the fulcrum pin, and the roller.
A composite electromagnetic switching valve. 2. The composite electromagnetic switching valve according to claim 1, wherein the fulcrum pin is disposed on the opposite side of the micro switch with respect to the dog. 3. The composite electromagnetic switching valve according to claim 2 , wherein the fulcrum pin is disposed on the opposite side of the screw across the microswitch in a direction orthogonal to the axial direction of the moving member .

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