JP4874468B2 - Pilot type solenoid valve and fluid pressure cylinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pilot-type solenoid valve and a fluid pressure cylinder including the same.
[0002]
[Prior art]
Conventionally, as shown in FIG. 6, for example, a pilot solenoid valve 181 is used to drive and control an air cylinder or the like. In the pilot type electromagnetic valve 181, a spool valve 183 is slidably provided in the valve housing casing 182. The spool valve 183 moves integrally with a large-diameter piston 186 accommodated in a pilot pressure working chamber 185 formed together with the pilot drive unit 184 so as to be able to reciprocate. Then, by opening and closing the first and second valve portions 187 and 188 provided in the pilot driving portion 184, pilot pressure is applied to the pressure receiving surface of the large-diameter piston 186 so that the spool valve 183 moves. It has become. Note that air pressure is constantly applied to the small-diameter piston 195 provided on the other end side of the spool valve 183.
[0003]
The valve housing casing 182 has one air supply port 189, first and second output ports 190 and 191, and first and second exhaust ports 192 and 193. Then, when the spool valve 183 moves to one switching position (position shown in FIG. 6), the air supply port 189 and the first output port 190 communicate with each other, and the second output port 191 and the second exhaust port 193 become Communicate with each other. Further, when the spool valve 183 moves to another switching position (not shown), the air supply port 189 and the second output port 191 communicate with each other, and the first output port 190 and the first exhaust port 192 communicate with each other. . As described above, the connection of the ports 189 to 193 is switched, so that the rod provided in the air cylinder appears and disappears.
[0004]
[Problems to be solved by the invention]
However, in the conventional pilot type electromagnetic valve 181, the ports 189 to 193 are arranged side by side along the axial direction of the spool valve 183 on one side surface of the valve housing casing 182. The dimension of the valve housing casing 182 increases. That is, if the valve housing casing 182 occupying most of the pilot solenoid valve 181 is enlarged, the pilot solenoid valve 181 as a whole is enlarged.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a pilot-type electromagnetic valve that can be miniaturized.
[0006]
[Means for Solving the Problems]
  In order to solve the above-mentioned problem, in the invention according to claim 1, in a valve housing casing having a fluid supply port and a plurality of output ports for supplying fluid introduced into the fluid supply port to the actuator. The spool valve is accommodated so as to be reciprocally movable between two positions, a first pressure acting chamber and a second pressure acting chamber are provided on both end sides of the spool valve, and a large-diameter piston is provided in the first pressure acting chamber. A pilot-type solenoid valve in which a small-diameter piston integrated with a spool valve is provided in the second pressure working chamber, and the spool valve is moved by applying a pilot pressure to the large-diameter piston. A fluid passage is provided therein, and when the spool valve is moved to the first switching position, the second pressure working chamber and the specific output port are communicated with each other via the fluid passage; The serial the second pressure working chamber when the spool valve is moved to the second changeover position and the other output port is communicated through said fluid passageway, said spool valve includes a coil having a movable iron core thereinInDriven by energization, the movable iron core and the spool valve are arranged with a positional relationship in which their axis lines are parallel to each other, and the fluid supply port is arranged with the output port in the valve housing casing. The gist is that it is arranged on the side surface orthogonal to the side surface.
[0007]
  According to a second aspect of the present invention, in the pilot solenoid valve according to the first aspect, the valve housing casing is provided.InThe gist of the invention is that a fluid supply passage communicating with the second pressure action chamber is formed, and the fluid is constantly supplied from the fluid supply port to the second pressure action chamber via the fluid supply passage. .
[0008]
  In the invention according to claim 3, in the pilot type solenoid valve according to claim 1 or 2,The valve housing casing is provided with a fluid discharge passage for discharging the fluid flowing from the actuator and having an exhaust port at an end thereof, and this fluid discharge passage also serves to discharge the fluid in the first pressure working chamber. ingThis is the gist.
[0009]
In the invention according to claim 4, the moving body is accommodated in the cylinder tube so as to be able to reciprocate, and the first pressure chamber and the second pressure chamber partitioned by the moving body are provided in the cylinder tube, The fluid pressure cylinder configured to reciprocate the moving body by the pressure of the fluid supplied to either of the two pressure chambers, to switch the fluid supply to each of the pressure chambers. The pilot-type solenoid valve described in 1 is provided.
[0010]
According to a fifth aspect of the present invention, in the fluid pressure cylinder according to the fourth aspect, a position detection sensor for detecting the position of the moving body is provided on the outer surface of the cylinder tube, and a lead connected to the position detection sensor. A connector for electrically connecting to an electric wire extending from a control unit that drives and controls the pilot type solenoid valve is provided at an end of the wire, and this connector is an electrical connection connector provided in the pilot type solenoid valve. The gist is that it is located in the vicinity.
[0011]
The “action” of the present invention will be described below.
According to the first aspect of the present invention, when the spool valve moves to the first switching position, the fluid in the pressure action chamber flows to the specific output port through the fluid passage. When the spool valve moves to the second switching position, the fluid in the pressure action chamber flows to the other output port via the fluid passage. That is, the fluid in the pressure action chamber is caused to flow to each output port. Therefore, as long as the fluid is supplied to the pressure action chamber, it is not necessary to arrange the port for supplying the fluid at a predetermined position. As a result, a plurality of output ports and fluid supply ports need not be concentratedly arranged along the axial direction of the spool valve, so that the valve housing casing can be downsized.
[0012]
  Also,Claim1According to the invention described in the above, the output port is arranged in the valve housing casing.~ sidesurfaceSide perpendicular toSince the fluid supply port can be arranged on the surface, the degree of freedom in design is increased.
[0013]
  further,Claim1According to the described inventionYesWhat is a moving iron core and spool valve?To face each otherSince they are arranged in parallel, the dimensions of the pilot solenoid valve in the spool axis direction can be reduced. Therefore, the pilot solenoid valve can be further downsized.
According to the third aspect of the present invention, the passage through which the fluid flows in the valve housing casing can be simplified.
[0014]
According to the invention described in claim 4, since the pilot-type solenoid valve can be downsized, it is possible to realize downsizing of the entire valve housing casing.
In the invention according to claim 5, the electrical connection connector of the pilot type solenoid valve and the connector of the position detection sensor are arranged in a concentrated manner. For this reason, it is possible to easily attach and detach the wiring connected to each connector. Further, the centralized arrangement of the connectors makes it easy to organize the wirings connected to the connectors. Therefore, the wiring space can be reduced and the wiring can be simplified.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in an air cylinder with a valve as a fluid pressure cylinder will be described in detail with reference to the drawings.
[0016]
As shown in FIG. 1, the air cylinder A with a valve includes a cylindrical cylinder tube 1. Among the openings of the cylinder tube 1, the opening on the right side in FIG. 1 is closed by the head cover 2, and the opening on the left side is closed by the rod cover 3.
[0017]
A first air passage 4 and a second air passage 5 are formed in the head cover 2. Both the air passages 4 and 5 communicate with the internal space of the cylinder tube 1. A piston 6 is accommodated in the internal space of the cylinder tube 1 so as to be slidable along the longitudinal direction of the cylinder tube 1. Due to the presence of the piston 6, the internal space of the cylinder tube 1 is partitioned into two pressure action chambers 7 and 8.
[0018]
Air as a fluid is supplied to and discharged from the head cover side pressure acting chamber 7 as the first pressure chamber via the first air passage 4. On the other hand, air is supplied to and discharged from the rod cover side pressure acting chamber 8 as the second pressure chamber via the second air passage 5. In FIG. 1, only a part of the second air passage 5 is depicted, but actually the second air passage 5 communicates with the rod cover side pressure action chamber 8. The inner end of the piston rod 9 is integrated with the center of the piston 6 by screwing. An outer end portion of the piston rod 9 penetrates the rod cover 3 and protrudes outside the cylinder tube 1.
[0019]
When air is supplied to the first air passage 4 with the piston 6 at the stroke end on the head cover side, air is introduced into the head cover side pressure acting chamber 7 and the pressure in the chamber 7 rises. Then, the piston 6 and the rod 9 move to the rod cover side, and the air in the rod cover side pressure action chamber 8 is discharged to the outside through the second air passage 5. In contrast, when air is supplied to the second air passage 5 with the piston 6 at the stroke end on the rod cover side, air is introduced into the pressure action chamber 8 on the rod cover side, and the pressure in the chamber 8 increases. To do. Then, the piston 6 and the rod 9 move to the head cover side, and the air in the head cover side pressure acting chamber 7 is discharged to the outside through the first air passage 4.
[0020]
As shown in FIGS. 1 and 5, a pilot type electromagnetic valve 11 is provided at the end of the cylinder tube 1 on the head cover side. By the excitation of the pilot type electromagnetic valve 11, the supply of air to the air passages 4, 5 is switched.
[0021]
Two magnetic sensors 80 and 81 which are position detection sensors are attached to the outer peripheral surface of the cylinder tube 1 with a gap therebetween. Both magnetic sensors 80 and 81 are disposed near the stroke end of the piston 6. Both magnetic sensors 80 and 81 detect the magnetic force of the magnet 93 provided on the piston 6. Thereby, it is detected whether the piston 6 has moved to the rod cover side stroke end or the head cover side stroke end.
[0022]
A lead wire 82 inserted in a lead wire mounting groove 94 formed in the pilot type electromagnetic valve 11 is connected to each of the magnetic sensors 80 and 81. The lead wire 82 is prevented from being displaced by a pressing cover 95 that closes the mounting groove 94. Sensor female connectors 83 and 84 are provided at the ends of the lead wires 82, respectively. The female connectors 83 and 84 for sensors are attached to a mounting cover 85 provided on the side surface of the pilot type electromagnetic valve 11. These female connectors for sensors 83 and 84 are arranged in the vicinity of the female connector for electromagnetic valve 86 as an electrical connection connector provided in the pilot type electromagnetic valve 11.
[0023]
To each of the female connectors 83, 84, 86, sensor male connectors 87, 88 and a solenoid valve male connector 89 are detachably connected. The sensor male connectors 87 and 88 are connected to one terminal block 97 via a multi-core cable 90 as an electric wire. The male connector 89 for the solenoid valve is connected to the other terminal block 98 via the multicore cable 90. One terminal block 97 is connected to the input-side controller 91, and the other terminal block 98 is connected to the output-side controller 92.
[0024]
Due to the connection relationship as described above, the magnetic sensors 80 and 81 are connected to the input-side controller 91 constituting the control unit. The pilot solenoid valve 11 is electrically connected to an output-side controller 92 that constitutes a control unit. When detection signals are output from the magnetic sensors 80 and 81, the detection signals are input to the input-side controller 91. Based on this signal input, the output-side controller 92 drives and controls the pilot solenoid valve 11.
[0025]
As shown in FIGS. 1 to 3, the pilot solenoid valve 11 includes a valve housing casing 12 made of synthetic resin, and a sleeve 10 as a cylindrical wear-resistant member is provided therein. The sleeve 10 is made of metal such as stainless steel or aluminum.
[0026]
A spool valve 14 serving as a moving body for switching a flow path of air that is a fluid is accommodated in the sleeve 10 so as to be reciprocally movable. The spool valve 14 has a plurality of valve portions 14a arranged on the shaft so as to be spaced apart from each other, and an annular seal member 23 is mounted on each valve portion 14a. The seal member 23 seals the interface between the inner peripheral surface of the sleeve 10 and the valve portion 14a. The diameter of each valve portion 14 a is slightly larger than the diameter of the spool valve 14. The valve housing casing 12 includes one air supply port P, a pilot valve air supply port 15a, a pilot valve exhaust port 15b, a pilot valve output port 15c, a first output port 16, a second output port 17, a first exhaust port 18, A second exhaust port 19 is provided.
[0027]
The first and second output ports 16 and 17 communicate with the first and second air passages 4 and 5 of the valved air cylinder A. On the other hand, as shown in FIG. 4, the first and second exhaust ports 18 and 19 communicate with a common exhaust port H through exhaust air passages 32a and 33a, respectively. As shown in FIGS. 4 and 5, two throttle valves (only the throttle valve 32 is shown in FIG. 4) 32 and 33 are provided on the exhaust air passages 32a and 33a. The throttle valves 32 and 33 are attached to the valve housing casing 12 so as to be able to advance and retract. Then, by adjusting the flow rate of air passing through the exhaust air passages 32a and 33a by the corresponding throttle valves 32 and 33, the protruding speed and the immersion speed of the piston rod 9 can be freely adjusted.
[0028]
Incidentally, by reducing the exhaust flow rate of the air discharged from the first exhaust port 18 at one throttle valve 33, the immersing speed of the piston rod 9 is decreased, and conversely, the immersing speed is increased. Is possible. Further, by reducing the exhaust flow rate of the air discharged from the second exhaust port 19 by the other throttle valve 32, the protruding speed of the piston rod 9 is decreased, and conversely, the protruding speed is increased by increasing it. Is possible.
[0029]
The ports 15a to 15c, the other ports 16 to 19, and the air supply port P are formed on different side surfaces of the valve housing casing 12, respectively. In the present embodiment, the pilot valve air supply port 15a, the pilot valve exhaust port 15b, and the pilot valve output port 15c are arranged on the side surface opposite to the side surface of the valve housing casing 12 in which the ports 16 to 19 are arranged. Yes. The air supply port P is disposed on a side surface orthogonal to the side surface of the valve housing casing 12 in which the ports 15a to 15c and 16 to 19 are disposed.
[0030]
A pilot pressure working chamber 21 as a first pressure working chamber is formed at a position located at one end of the spool valve 14 in the valve housing casing 12. On the other hand, an air pressure working chamber 22 as a second pressure working chamber is formed at a position located at the other end of the spool valve 14. A large-diameter piston 25 and a small-diameter piston 26 provided integrally with the spool are accommodated in each pressure working chamber 21, 22.
[0031]
A sliding packing 27 is attached to the outer periphery of the large-diameter piston 25. The sliding packing 27 seals the interface between the inner peripheral surface of the pilot pressure working chamber 21 and the outer peripheral surface of the large-diameter piston 25. Similar to the large-diameter piston 25, a sliding packing 28 is mounted on the outer periphery of the small-diameter piston 26 via a packing holder 29. The sliding packing 28 seals the interface between the inner peripheral surface of the air pressure working chamber 22 and the outer peripheral surface of the small diameter piston 26.
[0032]
The pressure receiving area of the large diameter piston 25 that receives the pilot pressure is different from the pressure receiving area of the small diameter piston 26 that receives the air pressure. That is, the pressure receiving area of the large diameter piston 25 is larger than that of the small diameter piston 26. Thereby, it can be said that the thrust by the pilot pressure which the large diameter piston 25 receives is larger than the thrust by the air pressure which the small diameter piston 26 receives. When both pistons 25 and 26 receive air pressure at the same time, the spool valve 14 moves to the first switching position (position shown in FIG. 2) due to the thrust difference generated in both pistons 25 and 26. When only the small diameter piston 26 receives air pressure, the spool valve 14 moves to the second switching position (position shown in FIG. 3).
[0033]
A pilot air supply passage 30 communicating with the pilot pressure working chamber 21 is formed in the valve housing casing 12, and an outer end portion of the pilot air supply passage 30 serves as the pilot valve output port 15c. An air supply passage 31 communicating with the air pressure working chamber 22 is formed in the valve housing casing 12, and an outer end portion of the air supply passage 31 serves as the pilot valve air supply port 15a. Air is constantly supplied from the air supply port P via the air supply passage 31. Therefore, the thrust by the air pressure is always acting on the small diameter piston 26.
[0034]
As shown in FIGS. 2 and 3, the spool valve 14 is formed with an air introduction passage 35 as a fluid passage. One end of the air introduction passage 35 is opened at the end face of the small diameter piston 26, and the other end is opened at the outer peripheral face of the spool valve 14. The air introduction passage 35 includes one large-diameter channel 35a and a plurality (two) of small-diameter channels 35b having a smaller hole diameter. The large-diameter flow path 35a extends along the axial direction of the spool valve 14 from the end face of the spool valve 14 to the vicinity of the center portion. On the other hand, the two small-diameter channels 35b are open at both ends, and extend along the radial direction of the spool valve 14 so as to be orthogonal to each other at the inner end of the large-diameter channel 35a. That is, one end of the air introduction passage 35 is opened at one position on one end face of the spool valve 14, and the other end is opened at a plurality of positions near the center of the outer peripheral face of the spool valve 14.
[0035]
Then, when the spool valve 14 moves to the first switching position (position shown in FIG. 2), the air pressure working chamber 22 and the first output port 16 communicate with each other via the air introduction passage 35. Accordingly, when the spool valve 14 is in the first switching position, the pressurized air fed into the pilot pressure working chamber 21 is supplied to the first output port 16 via the air introduction passage 35.
[0036]
Further, when the spool valve 14 is moved to the second switching position (position shown in FIG. 3), the air pressure working chamber 22 and the second output port 17 communicate with each other through the air introduction passage 35. Therefore, when the spool valve 14 is in the second switching position, the pressurized air fed into the pilot pressure working chamber 21 is supplied to the second output port 17 via the air introduction passage 35.
[0037]
As shown in FIGS. 1 to 3, a pilot drive unit D is provided on one side (the right side in FIG. 1) of the valve housing casing 12. The pilot drive unit D includes a synthetic resin drive unit body 41 joined to the valve housing casing 12. A pilot supply passage 34 that communicates with the pilot valve supply port 15a and a pilot exhaust passage 37 that communicates with the pilot valve exhaust port 15b are formed in the drive unit main body 41.
[0038]
A pilot output passage 40 communicating with the pilot valve output port 15c is formed in the drive unit main body 41. The pilot output passage 40 communicates with the pilot air supply passage 34 via a communication passage 36 formed in the drive unit main body 41. That is, the pressurized air supplied to the air supply port P is supplied into the pilot pressure working chamber 21 via the pilot air supply passage 34, the communication passage 36, and the pilot output passage 40.
[0039]
A first valve seat 38 is provided at a position located in the inner end of the pilot air supply passage 34 in the drive unit main body 41. A second valve seat 39 is provided at a position of the drive unit main body 41 located at the inner end of the pilot exhaust passage 37. Both valve seats 38 and 39 are arranged backward so as to face in opposite directions on the same line.
[0040]
A coil housing casing 42 is provided at one side of the drive unit main body 41, and a coil 44 wound around a bobbin 43 is provided therein. The accommodation hole 43 a formed in the center of the bobbin 43 is provided with a fixed iron core 45 and a movable iron core 46. One end opening of the accommodation hole 43a is closed by a fixed iron core 45, and a movable iron core 46 projects from the other end opening.
[0041]
The movable iron core 46 is arranged in such a positional relationship that its axis is parallel to the axis of the spool valve 14. By adopting such an arrangement, it is possible to make the entire pilot electromagnetic valve 11 compact in a direction orthogonal to the axial direction of the spool valve 14. This is because the valve housing casing 12 provided with the spool valve 14 has a large outer dimension in the axial direction of the spool valve 14 and a smaller outer dimension in a direction perpendicular to the axial direction. Further, the pilot drive unit D has a large outer dimension in the axial direction of the movable iron core 46 and a smaller outer dimension in a direction orthogonal to the axial direction.
[0042]
A first valve seat 51 and a second valve seat 52 that are movable integrally therewith are provided at the tip of the movable iron core 46. The first valve seat 51 is disposed on the distal end surface of the movable iron core 46, and the end surface thereof can abut against the first valve seat 38. On the other hand, the second valve seat 52 is disposed at a position separated from the first valve seat 51 via the seat holder 53. The end surface of the second valve seat 52 can come into contact with the second valve seat 39.
[0043]
When the coil 44 is energized, the movable iron core 46 is attracted by the electromagnetic force generated there, and is disposed at the energization position shown in FIG. As a result, the supply pilot valve B1 is opened and the exhaust pilot valve B2 is closed. Further, since no electromagnetic force is generated unless the coil 44 is energized, the movable iron core 46 protrudes and is disposed at the non-energized position shown in FIG. As a result, the supply pilot valve B1 is closed and the exhaust pilot valve B2 is opened.
[0044]
As shown in FIGS. 2 and 3, a large-diameter coil spring 56 is externally inserted at the tip of the movable iron core 46. One end of the large-diameter coil spring 56 is locked to a coil cover 55 provided in the coil housing casing 42. The other end of the large-diameter coil spring 56 is locked to an annular protrusion 54 formed on the outer peripheral surface of the distal end of the movable iron core 46. The large-diameter coil spring 56 applies an elastic force in a direction in which the first valve seat 51 is brought closer to the first valve seat 38.
[0045]
A spring support portion 59 is attached to a location facing the second valve seat 52 in the drive portion main body 41. A small-diameter coil spring 60 is provided between the spring support portion 59 and the second valve seat 52. One end of the small-diameter coil spring 60 is engaged with a locking projection 61 formed at the end of the second valve seat 52, and the other end is engaged with a locking projection 62 formed at the spring support 59. ing. The small-diameter coil spring 60 imparts an elastic force in a direction in which the second valve seat 52 is brought closer to the second valve seat 39. In the present embodiment, the first valve seat 51 and the first valve seat 38 constitute an air supply pilot valve B1. The second valve seat 52 and the second valve seat 39 constitute an exhaust pilot valve B2.
[0046]
The large diameter coil spring 56 is set to an elastic force larger than the elastic force of the small diameter coil spring 60. Therefore, when the coil 44 is not energized, only the first valve seat 51 is pressed against the first valve seat 38. Further, the combined force of the elastic force of the small diameter coil spring 60 and the electromagnetic attractive force of the coil 44 is set to be larger than the elastic force of the large diameter coil spring 56. Therefore, in a state where the coil 44 is energized, the second valve seat 52 is pressed against the second valve seat 39.
[0047]
Next, the operation of the pilot type electromagnetic valve 11 configured as described above will be described.
(Projection movement of piston rod 9)
When the coil 44 is energized, the movable iron core 46 is attracted by the electromagnetic force generated there, and the supply pilot valve B1 is opened and the exhaust pilot valve B2 is closed. Thus, pressurized air is supplied into the pilot pressure working chamber 21 through the air supply port P, the air supply passage 31, the pilot air supply passage 34, the communication passage 36, and the pilot output passage 40. Then, a pilot pressure is applied to the pressure receiving surface of the large diameter piston 25, and a thrust is generated in the large diameter piston 25.
[0048]
At this time, the pressurized air from the air supply port P is also supplied into the air pressure working chamber 22 via the air supply passage 31, and air pressure is constantly applied to the pressure receiving surface of the small diameter piston 26. That is, thrust by air pressure is always acting on the small diameter piston 26. However, since this thrust is smaller than the thrust of the large-diameter piston 25, the spool valve 14 moves to the first switching position (position shown in FIG. 2) as a result.
[0049]
By moving the spool valve 14 to the first switching position, the head cover is connected via the air supply port P, the air supply passage 31, the air pressure working chamber 22, the air introduction passage 35, the first output port 16, and the first air passage 4. Pressurized air is supplied into the side pressure working chamber 7. Thereby, the pressure in the head cover side pressure action chamber 7 rises, and the piston 6 and the piston rod 9 move in the direction of the rod cover side (left side in FIG. 1). At the same time, the air in the rod cover side pressure working chamber 8 passes through the sleeve 10 through the second air passage 5 and the second output port 17, and further, the second exhaust port 19, the exhaust air passage 32a, and the exhaust port H. It is discharged to the outside through.
[0050]
(Immersion operation of piston rod 9)
Next, when the coil 44 is not energized, the movable iron core 46 is protruded by the difference in elastic force between the coil springs 56 and 60, the supply pilot valve B1 is closed, and the exhaust pilot valve B2 is opened. Thereby, the pressurized air from the air supply port P is supplied only to the air pressure working chamber 22. That is, since no pilot pressure is applied to the pressure receiving surface of the large diameter piston 25, no thrust is generated in the large diameter piston 25. As a result, the spool valve 14 is moved to the second switching position (position shown in FIG. 3) under the thrust of only the small diameter piston 26. Further, as the spool valve 14 moves to the second switching position, the air in the pilot pressure working chamber 21 flows into the pilot air supply passage 30, the pilot output passage 40, the pilot exhaust passage 37, the pilot valve exhaust port 15b, It is discharged to the outside through the first exhaust port 18, the exhaust air passage 33 a and the exhaust port H.
[0051]
By switching the spool valve 14 to the second switching position, the rod is passed through the air supply port P, the air supply passage 31, the air pressure working chamber 22, the air introduction passage 35, the second output port 17, and the second air passage 5. Pressurized air is supplied into the cover side pressure working chamber 8. Thereby, the pressure in the rod cover side pressure action chamber 8 rises, and the piston 6 and the piston rod 9 move toward the head cover side (right side in FIG. 1). At the same time, the air in the head cover side pressure working chamber 7 passes through the sleeve 10 via the first air passage 4 and the first output port 16, and further passes through the first exhaust port 18, the exhaust air passage 33a, and the exhaust port H. It is discharged to the outside.
[0052]
Therefore, according to the present embodiment, the following effects can be obtained.
(1) An air introduction passage 35 extending along the axial direction is formed in the spool valve 14. When the spool valve 14 moves to the first switching position, the first output port 16 and the air pressure working chamber 22 are communicated with each other via the air introduction passage 35. Further, when the spool valve 14 moves to the second switching position, the second output port 17 and the air pressure working chamber 22 are communicated with each other via the air introduction passage 35. Therefore, the pressurized air in the air pressure working chamber 22 can be discharged from the output ports 16 and 17, and the piston rod 9 can be retracted. As a result, as long as the pressurized air from the air supply port P is supplied into the air pressure working chamber 22, the position of the air supply port P needs to be disposed between both output ports as shown in the prior art. Absent. Therefore, since it is not necessary to arrange the ports 16, 17, and P along the axial direction of the spool valve 14, the dimension of the valve housing casing 12 in the axial direction of the spool valve 14 is reduced. Therefore, the pilot solenoid valve 11 as a whole can be reduced in size, and the entire air cylinder A can be reduced in size.
[0053]
(2) The air supply port P can be arranged on a surface different from the surface on which both the output ports 16 and 17 are arranged in the valve housing casing 12. Therefore, the freedom degree of arrangement | positioning of air paths, such as the air supply path 31 formed in the valve storage casing 12, the pilot air supply path 30, and each port 16-19, becomes high. Therefore, the pilot solenoid valve 11 can be easily designed.
[0054]
(3) Since the air supply port P can be disposed on a surface different from the surface on which both the output ports 16 and 17 are disposed in the valve housing casing 12, the number of valve portions 14a formed on the spool valve 14 can be reduced. Can be reduced. That is, in contrast to the six valve portions 14a provided in the prior art, this embodiment can be reduced to four. Therefore, since the number of seal members 23 in contact with the sleeve 10 is reduced, the sliding resistance of the spool valve 14 with respect to the sleeve 10 can be reduced. In particular, since the resistance force at the start of the spool valve 14 can be reduced, the responsiveness of the spool valve 14 can be improved.
[0055]
(4) Since the spool valve 14 can be reduced in weight by the presence of the air introduction passage 35, the responsiveness of the spool valve 14 can be further improved.
(5) The valve housing casing 12 is provided with a sleeve 10 having wear resistance at a portion where the spool valve 14 slides. Due to the presence of the sleeve 10, the spool valve 14 and the valve housing casing 12 are not in contact with each other, and therefore the sliding portion of the spool valve 14 with respect to the valve housing casing 12 can be eliminated. Therefore, an inexpensive and lightweight synthetic resin or the like can be used as a material for forming the valve housing casing 12. As a result, it is possible to contribute to cost reduction and weight reduction of the pilot type solenoid valve 11 as a whole.
[0056]
(6) When discharging the air in the head cover side pressure working chamber 7 and discharging the air in the pilot pressure working chamber 21, the air is discharged from the exhaust port H through a common flow path. it can. Specifically, in any case, air can be discharged through the cylinder first exhaust port 18 and the exhaust air passage 33a. Therefore, since the air discharge path is made common, it is possible to contribute to simplification of the air passage formed in the valve housing casing 12, so that the processing cost of the valve housing casing 12 can be reduced.
[0057]
(7) The movable iron core 46 provided in the pilot drive unit D and the spool valve 14 provided in the valve housing casing 12 are arranged with a positional relationship in which their axes are parallel. Therefore, the dimensions of the pilot solenoid valve 11 in the spool axis direction can be reduced as compared with a case where the axes of the movable iron core 46 and the spool valve 14 are arranged in a perpendicular relationship.
[0058]
(8) The female connector 86 for the electromagnetic valve provided in the pilot type electromagnetic valve 11 and the female connectors for the sensors 83 and 84 connected to the magnetic sensors 80 and 81 are arranged in a concentrated manner. Therefore, the work of attaching / detaching the male connectors 87, 88, 89 to the female connectors 83, 84, 86 can be easily performed. Therefore, the air cylinder A can be easily replaced by maintenance or the like. Further, since the female connectors 83, 84, 86 are concentratedly arranged, the multi-core cable 901 can be obtained. Therefore, the wiring space can be reduced and the wiring can be simplified.
[0059]
In addition, you may change embodiment of this invention as follows.
The air supply port P may be provided in the vicinity of the air pressure working chamber 22, for example, and the pressurized air may be directly supplied to the air pressure working chamber 22 without passing through the air supply passage 31. In this case, as the arrangement position of the air supply port P, for example, the upper surface of the valve housing casing 12 (upper surface in FIG. 1), the upper left side surface of the valve housing casing 12 (left side surface in FIG. 1), or the like can be considered.
[0060]
In the embodiment, the sleeve 10 is provided in the valve housing casing 12 and the spool valve 14 is housed therein. However, the sleeve 10 may be omitted. When this configuration is adopted, it is preferable that the valve housing casing is made of metal instead of synthetic resin.
[0061]
  Next, in addition to the technical idea described in the claims, the technical idea grasped by the above-described embodiment is shown below..
[0062]
  (1) ValveA pilot-type solenoid valve characterized in that a wear-resistant member (sleeve) is provided at a boundary portion between the housing casing and the spool valve. With this configuration, the valve housing casing does not have to have wear resistance, and therefore the material for forming the valve housing casing does not have to have wear resistance. Therefore, the material of the valve housing casing can be made of synthetic resin, for example. Accordingly, the pilot solenoid valve can be reduced in weight and cost.
[0063]
  (2) A spool valve is housed in a valve housing casing having a fluid supply port and a plurality of output ports for supplying fluid introduced into the fluid supply port to the actuator so that the spool valve can reciprocate between two positions. A pilot type in which a piston integrated with the spool valve is provided in a pressure acting chamber provided on the end side of the valve so as to be able to reciprocate, and the spool valve is moved by applying a pilot pressure to the piston. In the solenoid valve, a fluid passage is provided inside the spool valve, and when the spool valve moves to the first switching position, the pressure action chamber and a specific output port are communicated with each other via the fluid passage, and the spool A pilot characterized in that when the valve is moved to the second switching position, the pressure action chamber and another output port are communicated with each other through the fluid passage. Electromagnetic valve.
[0064]
  (3) BeforeEach pressure chamber communicates with the fluid discharge passage (exhaust air passages 32a, 33a) provided in the pilot type solenoid valve, and a flow rate adjustment that adjusts the moving speed of the moving body in the middle of the fluid discharge passage. A pilot-type solenoid valve provided with means (throttle valves 32, 33).
[0065]
【The invention's effect】
As described above in detail, according to the present invention, since the fluid from the fluid supply port flows to the output port through the fluid passage provided in the spool valve, the pilot type solenoid valve can be downsized.
[Brief description of the drawings]
FIG. 1 is a sectional view of an air cylinder with a valve.
FIG. 2 is a cross-sectional view showing a state where a solenoid valve is energized.
FIG. 3 is a cross-sectional view showing a state where a solenoid valve is not energized.
4 is a cross-sectional view of a solenoid valve at a position different from that in FIG. 2;
FIG. 5 is an exploded perspective view of an air cylinder with a valve.
FIG. 6 is a sectional view of a conventional air cylinder with a valve.
[Explanation of symbols]
6 ... piston (moving body), 7 ... head cover side pressure acting chamber (first pressure chamber), 8 ... rod cover side pressure acting chamber (second pressure chamber), 9 ... piston rod (moving body), 11 ... Pilot solenoid valve, 12 ... valve housing casing, 14 ... spool valve, 16 ... first output port, 17 ... second output port, 18 ... first exhaust port, 19 ... second exhaust port, 21 ... pilot pressure working chamber (First pressure working chamber), 22 ... air pressure working chamber (second pressure working chamber), 25 ... large diameter piston, 26 ... small diameter piston, 35 ... air introduction passage (fluid passage), 46 ... movable iron core, 82 ... Lead wire, 83, 84 ... Female connector for connector (connector), 86 ... Female connector for solenoid valve (electrical connection connector), 90 ... Multi-core cable (electric wire), 91 ... Input side controller (control unit), 92 ... Output side Controller (control unit).

Claims (5)

A spool valve is housed in a valve housing casing having a fluid supply port and a plurality of output ports for supplying fluid introduced into the fluid supply port to the actuator so that the spool valve can reciprocate between two positions. A first pressure working chamber and a second pressure working chamber are provided on both end sides of the first pressure working chamber, a large-diameter piston is provided in the first pressure working chamber, and a small-diameter piston integrated with a spool valve is provided in the second pressure working chamber. In the pilot type solenoid valve provided to move the spool valve by applying a pilot pressure to the large diameter piston,
A fluid passage is provided inside the spool valve, and when the spool valve moves to the first switching position, the second pressure acting chamber and a specific output port are communicated with each other via the fluid passage, and the spool valve When the second switching position is moved to the second switching position, the second pressure working chamber communicates with another output port via the fluid passage;
The spool valve is driven by energizing the coil with a movable core inside, the A movable iron core and the spool valve, their axes are arranged in a positional relation of parallel opposed,
The pilot solenoid valve according to claim 1, wherein the fluid supply port is disposed on a side surface orthogonal to a side surface on which the output port is disposed in the valve housing casing. The said valve housing casing, the fluid supply passage leading to the second pressure working chamber is formed, from the fluid supply port, the fluid in the second pressure working chamber through said fluid supply passage is always supplied The pilot solenoid valve according to claim 1, wherein The valve housing casing is provided with a fluid discharge passage for discharging the fluid flowing from the actuator and having an exhaust port at an end thereof, and this fluid discharge passage also serves to discharge the fluid in the first pressure working chamber. pilot solenoid valve according to claim 1 or 2, characterized in that is. A moving body is accommodated in the cylinder tube so as to be able to reciprocate, and a first pressure chamber and a second pressure chamber partitioned by the moving body are provided in the cylinder tube and supplied to either of the pressure chambers. A fluid pressure cylinder configured to reciprocate the moving body by the pressure of the fluid to be provided, the pilot-type solenoid valve according to any one of claims 1 to 3 for switching the fluid supply to each pressure chamber. A fluid pressure cylinder characterized by that. A position detection sensor for detecting the position of the moving body is provided on the outer surface of the cylinder tube, and an end portion of a lead wire connected to the position detection sensor extends from a control unit for driving and controlling the pilot solenoid valve. The fluid pressure cylinder according to claim 4, wherein a connector for electrically connecting to the electric wire is provided, and the connector is disposed in the vicinity of the electrical connector provided in the pilot type solenoid valve. .

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