JP2010065747A - Control device of selector valve unit and hydraulic pressure cylinder apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control a selector valve unit so that high-speed switching may be performed by improving the responsibility of displacing valve element of the selector valve unit. <P>SOLUTION: The selector valve unit 11, which has a first port PT1, a second port PT2 and a third port PT3, and performs switching so that the second port PT2 may communicate with either of the first port PT1 and the third port PT3, is controlled by a control device 31 so that it may be switched between a first connecting condition where a liquid is supplied to the third port PT3 and a second connecting condition where the liquid is discharged to a tank 17 by connecting the third port PT3 to the tank 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device for a switching valve device having at least three ports, and a hydraulic cylinder device capable of performing high speed driving and high output driving (high pressure driving) using these switching valve device and control device. About. The present invention is used in, for example, a mold clamping device, a press-fitting device, a caulking machine, and a marking device.

  Conventionally, a hydraulic cylinder is used for clamping a die of a press device. In order to increase production efficiency, mold clamping is performed by moving the mold at high speed until the mold hits the workpiece, and then pressing the mold against the workpiece with high output after the mold hits the workpiece. It is common. The hydraulic cylinder used in such a press apparatus may have a relatively small output when moving the mold, and requires a high output only during pressing. Therefore, a dedicated hydraulic cylinder is provided for each of the mold movement and pressurization, or a ram with a small pressure-receiving area is built into the rod for movement, and the speed of the mold movement is increased. ing.

  The present applicant has previously proposed a hydraulic cylinder device that can perform high-speed driving and high-output driving with one hydraulic cylinder (Patent Documents 1 and 2). Next, the switching valve device 11j and the hydraulic cylinder device 1j proposed by Patent Document 1 will be described.

  FIG. 9 is a sectional front view of a conventional switching valve device 11j, and FIG. 10 is a circuit diagram of the hydraulic cylinder device 1j.

  As shown in FIG. 9, the switching valve device 11j includes a first cover 21, a tube 22, a second cover 23, a solenoid valve 24, a moving valve body 25, a spring 26, and the like.

  A hole 212 having a circular cross section is opened in one end surface 211 of the first cover 21. A poppet valve body 259 of the moving valve body 25 is slidably inserted into the hole 212. When the poppet valve body 259 comes into contact with the valve seat 214 provided at the bottom of the hole 212, the hole 212 is closed.

  The first cover 21 is provided with holes 219 and 220. The opening of the hole 219 is the first port PT1, and the opening of the hole 220 is the second port PT2. A flow path including the first port PT1, the hole 219, the hole 212, the hole 220, and the second port PT2 is a first flow path RR1.

  As shown in FIG. 10, the solenoid valve 24 is a two-position two-way valve that switches between a shut-off position incorporating a check valve and a communication position. The hole 234 and the hole 238 are communicated or blocked by the valve portion 242 of the solenoid valve 24. That is, when the solenoid of the solenoid valve 24 is off, the flow path from the hole 234 to the hole 238 is closed, and when the solenoid is turned on, the flow path from the hole 234 to the hole 238 is opened.

  The opening to the lower surface of the hole 234 is the fourth port PT4. A check valve body 237 is provided in the hole 234. The check valve body 237 constitutes a second check valve CH2. A portion of the hole 275 that opens to the hole 238 is the third port PT3. The flange portion 272 is provided with a hole 276 that communicates with the hole 236.

  The moving valve body 25 is provided so as to be capable of reciprocating in the axial direction inside the first cover 21 and the tube 22. The moving valve body 25 includes a main body 251, a valve body guide 253, a check valve body 254, a spring 255, and the like. A poppet valve body 259 is formed at the end of the main body 251. The moving valve body 25 is urged by the spring 26 so as to be always positioned at the right end. In the moving valve body 25, when the poppet valve body 259 comes into contact with the valve seat 214 provided at the moving end on the first cover 21 side, the first flow path RR1 described above is closed.

  A leg portion of the valve body 254 is slidably inserted into a circular hole provided in the valve body guide 253. A spring 255 is mounted in a compressed state between the base portion of the valve body guide 253 and the head of the valve body 254. The valve body 254, the spring 255, and the like constitute the first check valve CH1.

  The first check valve CH1 allows only the flow from the third port PT3 side to the second port PT2 side. A flow path connecting the second port PT2 and the third port PT3 is a second flow path RR2.

  In the switching valve device 11, when the hydraulic pressure is not applied to the third port PT3, the moving valve body 25 is biased by the spring 26 and is positioned at the right end, the first flow path RR1 is opened, and the second flow path is opened. RR2 is in a closed state. When hydraulic pressure is applied to the third port PT3, the moving valve body 25 moves to the left, the poppet valve body 259 comes into contact with the valve seat 214, and the first flow path RR1 is closed.

  In order to apply hydraulic pressure to the third port PT3, the solenoid of the solenoid valve 24 is turned on with pressure oil connected to the fourth port PT4. When the solenoid is turned off, the pressure oil does not flow into the third port PT3. However, when the pressure oil does not flow out from the second port PT2, the hydraulic pressure of the internal flow path does not decrease unless otherwise handled. . That is, in this state, the moving valve body 25 does not return even if the solenoid is turned off.

  In the switching valve device 11, when the hydraulic pressure of the fourth port PT4 decreases, the second check valve CH2 is opened, and the pressure oil in the internal flow path has holes 276, 236, the second check valve CH2, and the hole 234. Through the fourth port PT4. As a result, the pressure in the internal flow path is reduced, and the moving valve body 25 is returned to the right moving end by the spring 26.

  In FIG. 10, a hydraulic cylinder device 1j includes a switching valve device 11, a hydraulic cylinder 12, a pump 13, a replenishing device HK1, a fall prevention valve 14, a controller 20, and the like.

  When the pump 13 is driven and pressure oil is output from the supply / discharge port PA, the pressure oil enters the high speed cylinder chamber AA from the port PTA of the hydraulic cylinder 12. As a result, the rod 121 moves at a high speed and moves the mold at a high speed.

  By turning on the solenoid, the pressure oil from the supply / discharge port PA flows from the fourth port PT4 to the third port PT3, moves the moving valve body 25, closes the first flow path RR1, The flow path RR2 is opened. As a result, the hydraulic cylinder 12 performs high output driving, and the mold is clamped by the mold.

  When the mold clamping is finished, the solenoid of the solenoid valve 24 is turned off and the motor M is driven in reverse. Pressure oil is output from the supply / discharge port PB of the pump 13, and the pressure oil enters the return side cylinder chamber CA from the port PTC of the hydraulic cylinder 12. As a result, the rod 121 moves backward at high speed.

  At this time, in the switching valve device 11j, the second check valve CH2 is opened, and the pressure oil in the internal flow path returns from the fourth port PT4 to the supply / discharge port PA or to the tank 17. As a result, the moving valve body 25 is restored, the second flow path RR2 is closed, and the first flow path RR1 is opened. Therefore, the pressure oil in the high output cylinder chamber BA of the hydraulic cylinder 12 returns to the tank 17 through the first flow path RR1.

In this way, by using the switching valve device 11j in the hydraulic cylinder device 1j, high speed driving and high output driving can be performed by one hydraulic cylinder 12 without providing a hydraulic source in addition to the pump 13.
Patent No. 3881005 JP 2008-57732 A

  However, the hydraulic cylinder device 1j and the switching valve device 11j described above have the following problems.

  That is, when the hydraulic cylinder 12 is moved forward with a high output and then switched to the backward movement, there is a problem that the switching takes time.

  That is, in order to switch the hydraulic cylinder 12 from the forward movement to the backward movement, the moving valve body 25 of the switching valve device 11j is returned from the left end to the right end, and the first flow path RR1 is opened, and the high output It is necessary to return the pressure oil in the cylinder chamber BA to the tank 17 via the first flow path RR1.

  In order to return the moving valve body 25 to the right end, the solenoid of the solenoid valve 24 is turned off and the motor M is reversed, and the pressure oil in the second flow path RR2 is sucked out by the pump 13 and discharged. I must. However, at that time, if the motor M is rotated reversely and rotated at a normal high speed, the hydraulic cylinder 12 moves backward at a high speed, and a large amount of pressure oil in the high output cylinder chamber BA is discharged. The pressure oil collides in the second flow path RR2, and the moving valve body 25 does not return to the right end. That is, in the switching valve device 11j, the responsiveness of the moving valve body 25 is poor and high-speed switching cannot be performed.

  Therefore, when the motor M is reversely rotated, control is performed such that the motor M is operated at a low speed (for example, about 200 RPM) for a predetermined time (for example, about 2 seconds), and thereafter is operated at a high speed (for example, about 3000 RPM).

  Therefore, it takes a long time of about 2 to 3 seconds to switch the hydraulic cylinder 12 from the forward movement to the backward movement. This causes a problem that the cycle time of the operation of the hydraulic cylinder 12 becomes long.

  The present invention has been made in view of the above-described problems, and an object thereof is to improve the responsiveness of a moving valve body of a switching valve device and perform control so that high-speed switching can be performed.

  The apparatus according to the present invention has a first port, a second port, and a third port, and the second port communicates with either the first port or the third port. The switching valve device is a control device for switching between a movable valve body capable of reciprocating and a moving path of the movable valve body when the movable valve body is at one moving end. When the first flow path and the moving valve body are at the other moving end, the part is a part of the flow path and is provided to communicate the second port and the first port. A second flow path provided so that the internal flow path provided in the moving valve body is part of the flow path and the second port and the third port communicate with each other; and the mobile valve body A biasing member that biases the one moving end side toward the one moving end side, and the moving valve body includes A first check valve that allows only a flow from the third port side to the second port side is provided, and when the hydraulic pressure is applied to the third port, the movement is caused by the hydraulic pressure. The valve body moves to the other moving end to close the first flow path, and after the first flow path is closed, the first check valve is opened to open the second flow path. The control device is configured to open a first connection state for supplying liquid to the third port, and to connect the third port to a tank and discharge the liquid to the tank. Control is performed so as to switch between the two connection states.

  Here, the tank is not particularly limited in shape and size as long as it can receive the liquid discharged from the third port. It may be a simple container.

  Preferably, the control device is a three-way switching valve having an A port and a P port and an R port that are switched so as to be selectively connected to the A port, and the A port is the third port. The P port is connected to a liquid supply source, and the R port is connected to the tank.

  According to the present invention, the responsiveness of the moving valve body of the switching valve device can be improved and control can be performed so that high-speed switching can be performed.

  FIG. 1 is a cross-sectional front view showing a state of a switching valve device 11 according to an embodiment of the present invention at a normal time, and FIG. 2 is a diagram showing that a first flow path RR1 of the switching valve device 11 is closed and a second flow path RR2 is a fourth. FIG. 3 is a sectional front view showing a state in which the third port PT3 of the switching valve device 11 is in communication with the fifth port PT5. FIG. 4 is a first sectional view of the switching valve device 11. FIG. 5 to FIG. 7 are circuit diagrams of the hydraulic cylinder device 1, and FIG. 8 is an operation of each part in the hydraulic cylinder device 1. The flow path RR 1 is opened and the first port PT 1 communicates with the second port PT 2. It is a timing diagram which shows a state.

  5 is a circuit diagram when the hydraulic cylinder 12 moves forward at high speed, FIG. 6 is a circuit diagram when the hydraulic cylinder 12 moves forward at high output, and FIG. 7 shows a state where the hydraulic cylinder 12 moves backward at high speed. FIG.

  The switching valve device 11 shown in the present embodiment is basically the same in structure and operation as that shown in Patent Document 1 except for the control valve device 31 and its peripheral portion. Further, the hydraulic cylinder device 1 shown in the present embodiment is basically the same in circuit and operation as that shown in Patent Document 1 except for the control valve device 31 and its peripheral portion. Therefore, for the basic part, the description in Patent Document 1 and the background art can be referred to. Here, differences from them will be mainly described. 1 to 7, parts having the same functions as those shown in FIGS. 9 and 10 are denoted by the same reference numerals.

  As shown in FIGS. 1 to 4, the switching valve device 11 includes a first cover 21, a tube 22, a second cover 23, a moving valve body 25, a spring 26, and a control valve device 31.

  A hole 212 having a circular cross section is opened in one end surface 211 of the first cover 21. A poppet valve body 259 of the moving valve body 25 is slidably inserted into the hole 212. When the poppet valve body 259 comes into contact with the valve seat 214 provided at the bottom of the hole 212, the hole 212 is closed.

  A spring receiving portion 213 is provided in the vicinity of the opening of the hole 212. The first cover 21 is provided with holes 219 and 220. The opening of the hole 219 is the first port PT1, and the opening of the hole 220 is the second port PT2. A flow path including the first port PT1, the hole 219, the hole 212, the hole 220, and the second port PT2 is a first flow path RR1.

  The first cover 21 is provided with an auxiliary first port PT1a that communicates with the first port PT1. The auxiliary first port PT1a may be connected to the same circuit as the first port PT1, or may be closed with a plug or the like if not necessary.

  A hole 232 having a circular cross section is opened on one end surface 231 of the second cover 23. The second cover 23 is provided with holes 234, 238, 239.

  The opening to the lower surface of the hole 239 is the fourth port PT4. A hole 236 communicating with the hole 234 and opening to the hole 232 is provided. A check valve body 237 is provided in the hole 234. The check valve body 237 constitutes a second check valve CH2. The opening portion communicating with the hole 238 is the third port PT3.

  A moving valve element guide 27 is attached to the second cover 23. The moving valve element guide 27 includes a columnar guide portion 271 and a disc-shaped flange portion 272. The flange portion 272 is fitted into the hole 232 of the second cover 23. A hole 275 that communicates with the hole 238 is provided in the central portion of the moving valve element guide 27 along the axis. The flange portion 272 is provided with a hole 276 that communicates with the hole 236.

  A control valve device 31 is attached to the end surface 235 of the second cover 23 with a bolt or the like (not shown).

  The control valve device 31 includes a block 311, a valve body 313 inserted in a hole 312 provided in the block 311, a solenoid 314 that drives the valve body 313, and the like. The block 311 is provided with a hole 315 communicating with the third port PT3 and a hole 316 communicating with the fourth port PT4. When the solenoid 314 is turned on / off, the valve body 313 moves, whereby the hole 315 is selectively connected to either the hole 312 or the hole 316.

  That is, the control valve device 31 is a two-position three-way switching valve whose flow path is switched by turning on and off the solenoid 314. The hole 315 is an A port VA, the hole 316 is a P port VP, and the fifth port PT5 is an R port VR. Therefore, when the solenoid 314 is off, the A port VA and the R port VR are connected, and when the solenoid 314 is turned on, the R port VR is blocked and the A port VA and the P port VP are connected.

  The first cover 21, the tube 22, and the second cover 23 are integrated by being fastened together by four tie bolts. The moving valve body 25 is provided so as to be capable of reciprocating in the axial direction inside the first cover 21 and the tube 22. The moving valve body 25 includes a main body 251, a valve body guide 253, a check valve body 254, and a spring 255. A poppet valve body 259 is formed at the end of the main body 251.

  The guide portion 271 of the moving valve element guide 27 is inserted into the inner peripheral surface 256 of the main body 251, and the main body 251 can slide in the axial direction with respect to the outer peripheral surface of the guide portion 271. A partition wall 258 is provided on the inner peripheral surface 256 of the intermediate portion in the axial direction of the main body 251. The partition wall 258 is provided with a valve hole 257 having a diameter smaller than that of the inner peripheral surface 256. The periphery of the valve hole 257 is a valve seat.

  One end of the main body 251 is provided with a large-diameter collar part, and the spring 26 is mounted in a compressed state between the collar part and the spring receiving part 213. The moving valve body 25 is urged by the spring 26 so as to be always positioned at the right end.

  A poppet valve body 259 is formed at the other end of the main body 251. The land portion 260 formed in the poppet valve body 259 has an outer diameter substantially equal to the inner diameter of the hole 212 of the first cover 21 and is slidable with respect to the inner peripheral surface of the hole 212. The land 260 part contacts the valve seat 214 and closes the hole 212. When the poppet valve body 259 contacts the valve seat 214 provided at the moving end on the first cover 21 side, the first flow path RR1 is closed.

  A screw hole 261 is formed on the inner peripheral surface of the main body 251 where the land portion 260 is provided, and a poppet valve body 259 is formed by screwing a holding plug into the screw hole.

  A leg portion of the valve body 254 is slidably inserted into a circular hole provided in the valve body guide 253. A spring 255 is mounted in a compressed state between the base portion of the valve body guide 253 and the head of the valve body 254. The valve body 254 is biased by the spring 255 so as to contact the valve seat. The main body 251 is provided with a hole 262 communicating between the inside and the outside.

  The valve body 254, the spring 255, and the like constitute a first check valve CH1.

  An internal flow path is formed by the hole 275, the valve hole 257, the hole 262, and the like of the guide portion 271. The first check valve CH1 allows only the flow from the third port PT3 side to the second port PT2 side in this internal flow path. A flow path including the internal flow path and communicating the second port PT2 and the third port PT3 is a second flow path RR2.

  In the switching valve device 11, when the hydraulic pressure is not applied to the third port PT3, the moving valve body 25 is biased by the spring 26 and is positioned at the right end, the first flow path RR1 is opened, and the second flow path is opened. RR2 is in a closed state (the state shown in FIG. 1).

  During operation, that is, when hydraulic pressure is applied to the third port PT3 by turning on the solenoid 314 with pressure oil connected to the fourth port PT4, the moving valve body 25 moves to the left, and the poppet valve body 259 It abuts on the seat 214 and closes the first flow path RR1. During this time, the first check valve CH1 is kept closed. That is, the strengths of the spring 255 and the spring 26 are adjusted so that the pressure required for the movement of the valve body 254 is greater than the pressure required for the movement of the movement valve body 25.

  When the pressure of the internal flow path rises when the moving valve body 25 reaches the left moving end and stops, the valve body 254 moves to open the first check valve CH1. As a result, the second flow path RR2 is opened (state shown in FIG. 2).

  Next, when the solenoid 314 is turned off, as shown in FIG. 3, the pressure oil in the third port PT3 is discharged to the tank 17 via the A port VA and the R port VR (fifth port PT5). Thereby, the moving valve body 25 is restored by the urging force of the spring 26, the second flow path RR2 is closed, and the first flow path RR1 is opened (state shown in FIG. 4).

  Next, the operation of the switching valve device 11 will be described together with the operation of the hydraulic cylinder device 1 shown in FIGS. First, the circuit of the hydraulic cylinder device 1 will be described.

  5-7, the hydraulic cylinder device 1 includes a switching valve device 11, a hydraulic cylinder 12, a pump 13, a replenishing device HK1, a drop prevention valve 14, a pressure sensor PE, a controller 20, and the like.

  A single hydraulic cylinder 12 can perform high-speed driving and high-power driving in mold clamping. That is, it has a high speed cylinder chamber AA for driving the rod 121 at a high speed, a high output cylinder chamber BA for driving the rod 121 at a high output, and a return side cylinder chamber CA for returning the rod 121. In addition, supply and discharge of pressure oil to each cylinder chamber AA, BA, CA is performed via ports PTA, PTB, PTC. The cylinder chamber DA is connected to the tank 17 and pressure oil is supplied and discharged. The pressure of the pressure oil (pressure fluid) supplied to the port PTB is detected by the pressure sensor PE, and the detection signal SGP is sent to the controller 20.

  The pump 13 is a bidirectional pump capable of discharging in both directions by being driven forward or reversely by the motor M. That is, the pressure oil is discharged from one of the supply / discharge ports PA and PB and sucked from the other according to the rotation direction. The pressure of the pressure oil discharged from the pump 13 is, for example, about 5 to 20 MPa. A replenishing device HK1 including pilot check valves 15 and 16 and a tank 17 is provided between the supply / discharge ports PA and PB.

  The tank 17 has an excess or shortage of pressure oil due to a difference in effective pressure receiving area between the high speed cylinder chamber AA or the high output cylinder chamber BA and the return side cylinder chamber CA, a volume change due to a circuit temperature, etc., and a loss due to leakage. Contains pressure oil to adjust the minute.

  The fall prevention valve 14 prevents the hydraulic cylinder 12 from freely falling to the forward movement side due to the weight of a die or the like attached to the rod 121 when the hydraulic pressure in the cylinder chamber CA decreases due to the motor M being stopped or the like. .

  The controller controls the motor M so that the hydraulic cylinder 12 performs a predetermined operation or performs a predetermined positioning based on a detection signal SGP output from the pressure sensor PE, a setting signal (not shown), a command signal, and the like. Control start, stop, rotation direction, rotation speed, etc.

  The switching valve device 11 has a first port PT1 connected to the tank 17, a second port PT2 connected to the port PTB of the hydraulic cylinder 12, and a fourth port PT4 connected to the supply / discharge port PA of the pump 13 and the hydraulic cylinder 12. The fifth port PT5 is connected to the tank 17 while being connected to the port PTA.

  Now, when the pump 13 is driven by the motor M and the pressure oil is output from the supply / discharge port PA while the solenoid 314 is off, the pressure oil enters the high speed cylinder chamber AA from the port PTA of the hydraulic cylinder 12. . As a result, the rod 121 moves at a high speed and moves the mold at a high speed (the state shown in FIG. 5).

  In the meantime, the pressure oil from the port PA is supplied to the fourth port PT4 and the P port VP of the switching valve device 11, but the P port VP is shut off because the solenoid 314 is off, and the third port No pressure oil is applied to PT3. Therefore, the first flow path RR1 is in a communication state (the state shown in FIG. 1).

  When the rod 121 of the hydraulic cylinder 12 moves forward, the volume of the high output cylinder chamber BA increases. The increased pressure oil passes from the tank 17 through the first port PT1, the first flow path RR1, and the second port PT2 of the switching valve device 11 to the high output cylinder chamber BA via the port PTB. To be replenished. Further, the difference between the amount of pressure oil discharged from the supply / discharge port PA and the amount of pressure oil discharged from the return side cylinder chamber CA is replenished from the replenishing device HK1.

  When the die comes to the clamping position by the forward movement of the rod 121, the rod 121 stops moving. The controller 20 detects that the state has been reached, and turns on the solenoid 314.

  By turning on the solenoid, the pressure oil from the supply / discharge port PA flows from the fourth port PT4 to the third port PT3, moves the moving valve body 25, and closes the first flow path RR1 (FIG. 2). State shown in). Then, the first check valve CH1 is opened, whereby the second flow path RR2 is communicated (state shown in FIG. 2).

  Due to the communication of the second flow path RR2, the pressure oil from the supply / discharge port PA passes through the port PTB through the fourth port PT4, the third port PT3, the second flow path RR2, and the second port PT2. Into the high output cylinder chamber BA (state shown in FIG. 6). As a result, the hydraulic cylinder 12 performs high output driving, and the mold is clamped by the mold.

  When the mold clamping is finished, the controller 20 turns off the solenoid 314 and drives the motor M in the reverse direction. That is, at the same time as the solenoid 314 is turned off, the motor M is temporarily stopped, and then, after the elapse of time T1, it is started in reverse. At this time, since the moving valve body 25 quickly returns by turning off the solenoid 314, the time T1 from when the solenoid 314 is turned off until the motor M is started in reverse rotation may be short.

  That is, when the solenoid 314 is turned off, the second check valve CH2 is opened, and the pressure oil in the internal flow path returns from the fifth port PT5 to the tank 17 (the state shown in FIG. 3). Thereby, the moving valve body 25 returns in a short time, the second flow path RR2 is closed, and the first flow path RR1 is opened (state shown in FIG. 4).

  By the reverse drive of the motor M, pressure oil is output from the supply / discharge port PB of the pump 13, and the pressure oil enters the return side cylinder chamber CA from the port PTC of the hydraulic cylinder 12. As a result, the rod 121 moves backward at a high speed (the state shown in FIG. 7).

  Further, the pressure oil in the high output cylinder chamber BA of the hydraulic cylinder 12 returns to the tank 17 through the first flow path RR1.

  As shown in FIG. 8, when the solenoid 314 is turned on at time t1 while the hydraulic cylinder 12 is being driven at a high speed toward the forward movement side, the first flow path RR1 is closed, and then the second flow Road RR2 is opened. As a result, the hydraulic cylinder 12 is switched to high output driving, and the pressure sensor PE outputs a high pressure detection signal SGP.

  When the solenoid 314 is turned off at time t2, the moving valve body 25 immediately returns, the first flow path RR1 is opened, and the second flow path RR2 is closed. After the time T1 from the time t2, the hydraulic cylinder 12 moves backward at a high speed by starting the motor M in the reverse direction. The time T1 may be a short time, and may be about a sufficient second to a few seconds, for example, about 0.2 seconds. A timer is used to measure the time T1.

  As described above, the two-position three-way switching valve is used as the control valve device 31, and the first connection state (the state shown in FIG. 2) for supplying pressure oil to the third port PT3, and the third port PT3. Is switched to the second connection state (the state shown in FIG. 3) in which the pressure oil is connected to the tank 17 and discharged to the tank 17, so that the movable valve body 25 is restored in a short time.

  Thereby, since the responsiveness of the moving valve body 25 of the switching valve device 11 is greatly improved, the hydraulic cylinder 12 can be switched from the forward movement to the backward movement at a high speed, and a long time can be taken as in the prior art. It doesn't cost. Therefore, the cycle time of the operation of the hydraulic cylinder 12 can be shortened.

  Further, by using the switching valve device 11 in the hydraulic cylinder device 1, it is possible to perform high speed driving and high output driving with one hydraulic cylinder 12 without providing a pressure oil source in addition to the pump 13. The whole hydraulic cylinder device 1 can be made compact. Further, it is easy to integrate the entire hydraulic cylinder device 1, and an integrated compact hydraulic cylinder device 1 can be obtained. It is not necessary to make the effective pressure receiving areas of the high-speed cylinder chamber and the return-side cylinder chamber of the hydraulic cylinder 12 equal, and the degree of freedom in designing the hydraulic cylinder 12 is high. The manufacturing cost can be reduced accordingly.

  In addition, since the switching valve device 11 is in a state where the first flow path RR1 is normally open, a large amount of pressure oil can be flowed, and the rod 121 can be moved at a high speed. The circuit configuration of the hydraulic cylinder device 1 is simple and the operation is stable.

  In the above-described embodiment, the time T1 is measured by the timer provided in the controller 20, and control is performed so that the motor M is started in reverse from the stopped state. However, instead of this, control may be performed based on the detection signal SGP of the pressure sensor PE. For example, when the detection signal SGP returns from a high pressure to a constant pressure, the motor M may be controlled to start in a reverse direction from a stopped state.

  In the above-described embodiment, the control valve device 31 is integrally provided in the switching valve device 11. However, the control valve device 31 may be provided separately and connected between them by piping.

  In the embodiment described above, the hydraulic cylinder 12 performs high-speed driving and high-power driving only during forward movement, but as disclosed in Patent Document 2, high-speed driving and high-power driving are also performed during backward movement. A hydraulic cylinder that performs driving may be used, and the two switching valve devices 11 may be provided for forward movement and backward movement.

  In the embodiment described above, the hydraulic cylinder device 1 can be integrated. As a result, high-speed driving and high-power driving can be easily performed, and the usability is extremely good. A hydraulic cylinder may be used in place of the hydraulic cylinder 12.

  In addition, the configuration, structure, material, shape, size, number, etc. of the whole or each part of the control valve device 31, the switching valve device 11, the hydraulic cylinder 12, or the hydraulic cylinder device 1 are appropriately changed in accordance with the spirit of the present invention. be able to.

It is a section front view of the change-over valve device of one embodiment of the present invention. It is a cross-sectional front view which shows the state which the 1st flow path of the switching valve apparatus closed and the 2nd flow path connected to the 4th port. It is a cross-sectional front view which shows the state which the 3rd port of the switching valve apparatus connected to the 5th port. It is a cross-sectional front view which shows the state which the 1st flow path of the switching valve apparatus opened and the 1st port connected to the 2nd port. It is a circuit diagram of a hydraulic cylinder device. It is a circuit diagram of a hydraulic cylinder device. It is a circuit diagram of a hydraulic cylinder device. It is a timing diagram which shows the operation state of each part in a hydraulic cylinder apparatus. It is a cross-sectional front view of the conventional switching valve apparatus. It is a circuit diagram of the conventional hydraulic cylinder apparatus.

Explanation of symbols

1 Hydraulic cylinder device (hydraulic cylinder device)
11 Switching valve device 12 Hydraulic cylinder (hydraulic cylinder)
17 Tank 20 Controller (control device)
21 First cover (first cover)
22 Tube 23 Second cover (second cover)
25 Moving valve body 26 Spring (biasing member)
31 Control valve device (control device)
CH1 First check valve CH2 Second check valve RR1 First flow path RR2 Second flow path PT1 First port (first port)
PT2 Second port (second port)
PT3 3rd port (3rd port)

Claims (4)

Control of a switching valve device having a first port, a second port, and a third port, and switching so that the second port communicates with either the first port or the third port A device,
The switching valve device is
A reciprocating movable valve body;
When the moving valve body is at one moving end, a part of the moving path of the moving valve body is a part of the flow path so as to communicate the second port with the first port. A first flow path;
When the moving valve body is at the other moving end, an internal flow path provided in the moving valve body is used as a part of the flow path so as to communicate the second port and the third port. A second flow path,
A biasing member that biases the moving valve body toward the one moving end,
The moving valve body is provided with a first check valve that allows only a flow from the third port side to the second port side in the internal flow path,
When a hydraulic pressure is applied to the third port, the moving valve body moves to the other moving end due to the hydraulic pressure, closes the first flow path, and closes the first flow path. The first check valve is opened and the second flow path is opened after being
The control device includes:
Controlling to switch between a first connection state for supplying liquid to the third port and a second connection state for connecting the third port to the tank and discharging the liquid to the tank;
A control device for a switching valve device. The control device includes:
A three-way switching valve having an A port and a P port and an R port that are switched to be selectively connected to the A port;
The A port is connected to the third port, the P port is connected to a liquid supply source, and the R port is connected to the tank.
The control apparatus of the switching valve apparatus of Claim 1. A second check valve for allowing a part of the liquid in the second flow path to escape to the third port is provided;
The control apparatus of the switching valve apparatus of Claim 2. A switching valve device and a control device according to any one of claims 2 to 3,
A return-type hydraulic cylinder having a first cylinder chamber and a second cylinder chamber having an effective pressure receiving area larger than that of the first cylinder chamber, which are provided for forward driving;
A tank for storing a liquid to be supplied to the hydraulic cylinder;
With
The first cylinder chamber is connected to a supply source of the liquid;
The second cylinder chamber is connected to the second port;
The first port is connected to the tank containing a liquid;
A hydraulic cylinder device.

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