JP4688759B2 - Fluid pressure cylinder device - Google Patents

Description

  The present invention relates to a fluid pressure cylinder device configured to reciprocate at a high speed or a low speed by controlling a first switching valve device and a second switching valve device. 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.

  In either case, when moving at high speed, it is necessary to replenish the pressure oil directly from the tank against the increase in the volume of the pressurizing cylinder chamber. It is necessary to. Furthermore, when returning the mold from clamping to the standby position, it is necessary to discharge a large amount of pressurized oil in the pressurizing cylinder chamber to the tank.

  In response to these requirements, when separate hydraulic cylinders for movement and pressurization are provided, for example, a hydraulic cylinder using a profile valve 81 that can obtain a large flow rate with low pressure loss as shown in FIG. A device 8 has been proposed (Non-Patent Document 1).

  The present applicant has previously proposed and disclosed a fluid pressure cylinder device that can perform high-speed driving and high-power driving with one fluid pressure cylinder (Patent Document 1).

The fluid pressure cylinder device includes a fluid pressure cylinder, a bidirectional pump having two supply / exhaust ports for supplying and discharging fluid to reciprocate the fluid pressure cylinder, and a bidirectional pump in either the forward direction or the reverse direction. And a motor that selectively rotates. The fluid pressure cylinder includes a cylinder tube, a piston that slides inside the cylinder tube, a cover that closes both end faces of the cylinder tube, and a rod that is connected to the piston and penetrates one of the covers. The cylinder chamber on the forward side of the fluid pressure cylinder has a high-speed cylinder chamber having substantially the same effective pressure receiving area as the reverse-side cylinder chamber which is the reverse-side cylinder chamber, and a high-output cylinder having the remaining effective pressure-receiving area. A valve is provided for switching the fluid supplied from the bidirectional pump to selectively supply the cylinder chamber for high output.
http: // www. yuken. co. jp / japanes / pdf / E407. pdf JP 2002-147404 A

  However, when the system using the profile valve 81 as proposed in Non-Patent Document 1 is to be implemented by a bidirectional pump, even when the bidirectional pump rotates in the same direction, it is not moved and pressed. There is a problem that the profile valve needs to be opened and closed, and a pump for generating a pilot pressure for operating the profile valve 81 must be prepared separately.

  Further, in the fluid pressure cylinder device of Patent Document 1, since it is necessary to make the effective pressure receiving areas of the high-speed cylinder chamber and the return-side cylinder chamber equal, the design of the hydraulic cylinder is restricted accordingly, and the manufacturing cost is increased. There's a problem.

  The present applicant has disclosed a switching valve device capable of flowing a large flow rate without requiring any other pressure source even when a bidirectional pump is used, and without restricting the design of the hydraulic cylinder, and the switching valve device The fluid pressure cylinder device using the above was previously proposed as Japanese Patent Application No. 2005-67139.

  The present invention is an improvement over the previously proposed fluid pressure cylinder device so that it can be switched to either high speed or high output in either case of forward drive or backward drive. is there.

An apparatus according to the present invention is a fluid pressure cylinder device configured such that a fluid pressure cylinder reciprocates at a high speed or a low speed by controlling a first switching valve device and a second switching valve device, Each of the first switching valve device and the second switching valve device has a first port, a second port, and a third port, and the second port is the first port or the the third one to be one which is switched so that communication ports, shut-off valve for blocking the fluid supplied from the outside has kicked set, the inflow side of the shut-off valve of the fourth port And the outflow side of the shut-off valve communicates with the third port, and the fluid pressure cylinder is provided by a first cylinder chamber and a first cylinder chamber provided for forward drive. Is also very effective A second cylinder chamber having a pressure area, and a third cylinder chamber and a fourth cylinder chamber having an effective pressure receiving area larger than that of the third cylinder chamber, which are provided for backward driving. The fourth port of the first switching valve device is one output port of the bidirectional pump for supplying the first cylinder chamber and the pressurized fluid, and the second port is the second cylinder chamber. Are connected so as to communicate with each other, the fourth port of the second switching valve device is connected to the other output port of the third cylinder chamber and the bidirectional pump, and the second port is connected to the fourth cylinder. Each room is connected to communicate with each other.

According to another aspect, each of the first switching valve device and the second switching valve device has a first port, a second port, and a third port, and the second port is When switching to communicate with either the first port or the third port, the movable valve body capable of reciprocating, and when the movable valve body is at one moving end, A first flow path provided so that a part of the movement path of the movement valve body is a part of the flow path and the second port communicates with the first port, and the movement valve body is the other An internal flow path provided in the moving valve body as a part of the flow path, and the second port and the third port are communicated with each other. A flow path and a biasing member that biases the movable valve body toward the one movable end, and the movable valve Is provided with a first check valve that allows only the flow from the third port side to the second port side in the internal flow path, and when fluid pressure is applied to the third port In addition, the fluid valve causes the moving valve body to move 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. is configured to open the second flow path Te, further shutoff valve is set vignetting for blocking fluid supplied from the outside, the inflow side of the shut-off valve is provided as the fourth port And the outflow side of the shut-off valve is in communication with the third port, and the fluid pressure cylinder is more effective than the first cylinder chamber and the first cylinder chamber provided for forward drive. A second cylinder chamber having a pressure receiving area; And a fourth cylinder chamber having a larger effective pressure receiving area than the third cylinder chamber and the third cylinder chamber, the fourth port of the first switching valve device. Are connected to the first cylinder chamber, the second port is connected to the second cylinder chamber, and the fourth port of the second switching valve device is connected to the third cylinder chamber. The second port is connected to the fourth cylinder chamber so as to communicate with each other.

Preferably, in each of the first switching valve device and the second switching valve device, the moving valve body closes the first flow path when the moving valve body is at the other moving end. The pressure fluid in the flow path communicating between the poppet valve body provided on the other moving end side of the first check valve and the first check valve is released to the fourth port, and the biasing member biases the pressure fluid. A second check valve is provided to enable the moving valve body to return to the one moving end side .

According to another aspect, the fluid pressure cylinder device is configured such that the fluid pressure cylinder is reciprocated at a high speed or a low speed by controlling the first switching valve device and the second switching valve device, The first switching valve device and the second switching valve device each have a first port, a second port, and a third port, and the second port is the first port or the first port. 3 to switch to communicate with any one of the three ports, a tube, a first cover for closing one end of the tube, a second cover for closing the other end of the tube, the tube and the first A movable valve body capable of reciprocating in the axial direction inside the cover of the first cover, and when the movable valve body is at the movable end on the second cover side, a part of the movement path of the movable valve body is a flow path As part of the second paw And the first port provided to communicate with the first port, and when the moving valve body is at the moving end on the first cover side, the moving valve body is provided on the moving valve body. A second flow path provided so as to communicate the second port and the third port with an internal flow path as a part of the flow path, and the moving valve body attached to the cover side of the second. A poppet valve body that closes the first flow path by contacting a valve seat provided at a moving end on the first cover side, and the poppet A first check valve provided integrally with a valve body and allowing only a flow from the third port side to the second port side in the internal flow path, and is always The poppet valve body is separated from the valve seat by urging and the first flow path is opened, and the third port is opened. When the fluid pressure is applied, the moving valve body moves due to the fluid pressure, the poppet valve body comes into contact with the valve seat, closes the first flow path, and closes the first flow path. is configured to open the second flow path the after being first check valve is in the open, further shut-off valve for blocking the pressure fluid supplied from the outside is set vignetting, The inflow side of the shut-off valve is provided as a fourth port, the outflow side of the shut-off valve is communicated with the third port, and the fluid pressure cylinder is provided for forward drive. A cylinder chamber and a second cylinder chamber having an effective pressure receiving area larger than that of the first cylinder chamber, and a third cylinder chamber and a third cylinder chamber which are provided for backward driving and are more effective than the third cylinder chamber. A fourth cylinder chamber having a pressure receiving area; And a fourth port of the first switching valve device is connected to the first cylinder chamber, a second port is connected to the second cylinder chamber, and is connected to the second switching chamber. A fourth port of the valve device is connected to the third cylinder chamber, and a second port is connected to the fourth cylinder chamber so as to communicate with each other.

  According to the present invention, even when a bi-directional pump is used, a large flow rate can be allowed to flow without requiring another pressure source, the design of the fluid pressure cylinder is not restricted, and the forward drive is performed. In either case, it can be switched to either high speed or high output.

  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, FIG. 2 is a plan view showing a part of the switching valve device 11, and FIG. 3 is a solenoid valve in FIG. 4 is a partial cross-sectional view of the moving valve body 25, FIG. 5 is a diagram corresponding to FIG. 1 showing a state during the switching operation of the switching valve device 11, and FIG. 6 is a switching valve. FIG. 7 is a circuit diagram of the hydraulic cylinder device 1, and FIG. 8 is a cross-sectional view of the hydraulic cylinder device 1.

  As shown in FIGS. 1 to 3, the switching valve device 11 includes a first cover 21, a tube 22, a second cover 23, a solenoid valve 24, a moving valve body 25, and a spring 26.

  The first cover 21 is made of a metal material and has a substantially rectangular parallelepiped shape. A hole 212 having a circular cross section is opened in one end surface 211 of the first cover 21. As will be described later, a poppet valve body 259 of the moving valve body 25 is slidably inserted into the hole 212. Therefore, the hole 212 is a movement path of the poppet valve body 259, and the hole 212 is closed when the poppet valve body 259 comes into contact with the valve seat 214 provided at the bottom of the hole 212 (see FIGS. 5 and 6). ).

  A spring receiving portion 213 having a diameter larger than that of the hole 212 is provided in the vicinity of the opening of the hole 212. Furthermore, a large diameter portion 215 having a diameter larger than that of the spring receiving portion 213 is provided in the opening portion of the hole 212. The tube 22 is fitted into the large diameter portion 215.

  The first cover 21 is provided with a hole 219 that communicates with the hole 212 and opens on the upper surface, and a hole 220 that communicates with the hole 212 and opens on the lower surface. 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 second cover 23 is made of a metal material and has a substantially rectangular parallelepiped shape. A hole 232 having a circular cross section is opened on one end surface 231 of the second cover 23. The tube 22 is fitted into the hole 232. The second cover 23 is provided with a hole 234 that penetrates from the top surface to the bottom surface, and a hole 238 that penetrates from the hole 232 of one end surface 231 to the other end surface 235 so as to intersect and communicate with the hole 234. Provided.

  The solenoid valve 24 is screwed and attached to the opening portion of the hole 238 to the end surface 235. As shown in FIG. 7, 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. An opening to the upper surface of the hole 234 is closed by a plug 239, and a hole 236 that communicates with the hole 234 and opens to the hole 232 is provided. A check valve body 237 is provided on the side of the hole 234 that is closed by the plug 239 so that a free flow is generated only in the direction from the hole 236 toward the hole 234. The check valve body 237 constitutes a second check valve CH2.

  As can be understood from the above description, the fluid that has entered the hole 236 can flow out to the fourth port PT4 via the hole 234 regardless of whether the valve portion 242 is opened or closed.

  In addition, 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. 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 tube 22 is made of a metal material and has a circular cross section. One end surface of the tube 22 is closed by fitting into the large-diameter portion 215 of the first cover 21, and the other end surface thereof is inserted into the hole 232 of the second cover 23 and closed. The flange portion 272 of the moving valve element guide 27 described above is sandwiched and held between the other end surface of the tube 22 and the second cover 23.

  As shown in FIGS. 2 and 3, the first cover 21, the tube 22, and the second cover 23 are fastened together by four tie bolts 29 and integrated. The first cover 21 and the outer peripheral surface of the tube 22 and the second cover 23 and the outer peripheral surface of the tube 22 are sealed by packing.

  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.

  As shown well in FIG. 4, the moving valve body 25 includes a main body 251, a holding plug 252, 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 main body 251 is made of a metal material and has a substantially cylindrical outer shape. 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. An O-ring 274 is attached to the outer periphery of the guide portion 271 to seal between the outer peripheral surface of the guide portion 271 and the inner peripheral surface 256.

  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 flange portion 263, and the spring 26 is mounted in a compressed state between the flange portion 263 and the spring receiving portion 213. The moving valve body 25 is always urged by the spring 26 so as to be positioned at the right end of FIG. The right end corresponds to one moving end in the present invention.

  A poppet valve body 259 is formed at the other end of the main body 251. The poppet valve body 259 has an outer peripheral portion larger in diameter than other portions of the main body 251, and a land portion 260 is formed there. The land portion 260 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. An end portion further than the land 260 is formed in a tapered shape, and the tapered portion abuts on the valve seat 214 to close the hole 212. Thus, 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 screw hole 261 is formed in the inner peripheral surface of the portion of the main body 251 where the land portion 260 is provided, and the holding plug 252 is screwed into the screw hole 261, thereby closing one end surface of the main body 251. .

  The holding plug 252 is provided with a hole 265 having a circular cross section on the inner end face thereof. In the hole 265, a valve body guide 253 including a base portion 267 and a valve guide portion 266 is fitted and positioned.

  A leg portion 270 of the valve body 254 is slidably inserted into a circular hole 268 provided in the valve body guide 253. A spring 255 is mounted in a compressed state between the base portion 267 of the valve body guide 253 and the head portion 269 of the valve body 254.

  The valve body 254 is urged by the spring 255 so that the head 269 contacts the valve seat of the partition wall 258. In the vicinity of the partition wall 258 of the main body 251, four holes 262, 262... Communicating with the inside and the outside of the main body 251 are provided at intervals of 90 degrees in the circumferential direction.

  The valve body 254, the partition 258, and the spring 255 constitute a first check valve CH1.

  The flow path formed inside the moving valve body 25 corresponds to the internal flow path in the present invention. That is, 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.

  When the switching valve device 11 is in a steady state, that is, when no fluid pressure is applied to the third port PT3, as shown in FIG. 1, the moving valve body 25 is urged by a spring 26 and is positioned at the right end. The flow path RR1 is open and the second flow path RR2 is closed. During operation, that is, when fluid pressure is applied to the third port PT3, the moving valve body 25 moves to the left, the poppet valve body 259 abuts against the valve seat 214 as shown in FIG. 5, and the first flow path RR1. Close. 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 at which the valve body 254 moves is greater than the pressure at which the moving valve body 25 moves. Specifically, for example, the valve body 254 operates at 0.3 MPa, and the moving valve body 25 operates at 0.15 MPa.

  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 and the first check valve CH1 opens as shown in FIG. This opens the second flow path RR2.

  In order to apply fluid pressure to the third port PT3, the solenoid of the solenoid valve 24 is turned on with the pressurized fluid connected to the fourth port PT4. When the solenoid is turned off, the pressurized fluid does not flow into the third port PT3. However, when the fluid does not flow out from the second port PT2, the fluid pressure in 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 of the present embodiment, when the fluid pressure at the fourth port PT4 decreases, the second check valve CH2 opens, and the pressurized fluid in the internal flow path passes through the holes 276, 236, the second check valve. It flows out from the fourth port PT4 via CH2 and the hole 234. 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 (state shown in FIG. 1).

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

  In the hydraulic cylinder device 1, the two switching valve devices 11 described above are used as the first switching valve device 11A and the second switching valve device 11B. Therefore, for the first switching valve device 11A and the second switching valve device 11B, the same components are denoted by the same reference numerals, but the first and second switching valve devices 11B have the same reference numerals. For the switching valve device 11A, "A" is added to the reference symbol for the member, and for the second switching valve device 11B, "B" is added to the reference symbol for the member.

  For the first switching valve device 11A, the high-speed cylinder chamber is “AA” and the high-output cylinder chamber is “BA”. For the second switching valve device 11B, the high-speed cylinder chamber is “CA” and the high-output cylinder chamber is “DA”. These cylinder chambers AA, BA, CA, and DA correspond to the first cylinder chamber, the second cylinder chamber, the third cylinder chamber, and the fourth cylinder chamber, respectively, in the present invention.

  In FIG. 7, the hydraulic cylinder device 1 includes two switching valve devices 11A and 11B, a hydraulic cylinder 12, a pump 13, a replenishing device HK1, a fall prevention valve 14, a controller 20, and the like.

  A single hydraulic cylinder 12 can perform high-speed driving and high-power driving in mold clamping. Further, when the mold is loosened, high output driving and high speed driving can be performed. That is, the forward side high speed cylinder chamber AA for driving the rod 121 at high speed, the forward side high output cylinder chamber BA for driving the rod 121 at high output, and the return for driving the rod 121 at high speed. It has a moving side high speed cylinder chamber CA and a return side high output cylinder chamber DA for high output driving.

  Further, the supply and discharge of the pressure oil to each cylinder chamber AA, BA, CA, DA is performed via ports PTA, PTB, PTC, PTD. The pressure of the pressure oil (pressure fluid) supplied to the port PTB is detected by a pressure sensor, 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 a pressure due to a difference in effective pressure receiving area between the forward-side high-speed cylinder chamber AA or the forward-side high-power cylinder chamber BA and the backward-side high-speed cylinder chamber CA or the backward-side high-power cylinder chamber DA. Accommodates pressure oil that adjusts for excess and deficiency of oil, volume change due to circuit temperature, and loss due to leakage.

  The fall prevention valve 14 allows the hydraulic cylinder 12 to freely fall to the forward movement side due to the weight of a die attached to the rod 121 when the hydraulic pressure of the return side high speed cylinder chamber CA is lowered due to the motor M being stopped or the like. To prevent it. The fall prevention valve 14 may be provided so as to be connected also to the return side high output cylinder chamber DA.

  The circuit diagram of FIG. 7 is used when the rod 121 is downward, and the drop prevention valve 14 is not necessary when the rod 121 is lateral. Further, when the rod 121 is upward, the fall prevention valve may be connected to the two ports PTA and PTB.

  The controller controls the hydraulic cylinder 12 to perform a predetermined operation based on detection signals SGL and SGP output from a length measurement sensor 18 such as a resolver and a pressure sensor, a setting signal and a command signal (not shown), or a predetermined operation. The rotational direction and rotational speed of the motor M are controlled so as to perform positioning.

  In each of the two switching valve devices 11, the first port PT <b> 1 is connected to the tank 17. The second port PT2 of the switching valve device 11A is connected to the port PTB of the hydraulic cylinder 12, and the fourth port PT4 of the switching valve device 11A is connected to one supply / discharge port PA of the pump 13 and the port PTA of the hydraulic cylinder 12. The

  The second port PT2 of the switching valve device 11B is connected to the port PTD of the hydraulic cylinder 12, and the fourth port PT4 of the switching valve device 11B is connected to the other supply / discharge port PB of the pump 13 and the port PTC of the hydraulic cylinder 12. The

  When the pump 13 is driven by the motor M and pressure oil is output from the supply / discharge port PA, the pressure oil enters the forward-side 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.

  In the meantime, the pressure oil from the supply / discharge port PA is supplied to the fourth flow path RR4 of the switching valve device 11A, but since the solenoid of the solenoid valve 24 is off, the pressure oil is supplied to the third port PT3. Don't join. 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 forward movement high output cylinder chamber BA increases. The increased amount of pressurized 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 11A, and passes through the port PTB to the forward side high output cylinder. Supply to room BA. 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 high speed cylinder chamber CA and the return side high output cylinder chamber DA is supplied from the supply device HK1. .

  When the die comes to the clamping position by the forward movement of the rod 121, the movement of the rod 121 stops. The controller 20 detects that the state is reached and turns on the solenoid of the solenoid valve 24.

  In addition, as a method of detecting that the movement of the rod 121 has stopped, for example, a detection signal SGL of the position of the rod 121 by the length measurement sensor 18 is used. In addition, it is also possible to use various signals such as a time-lapse signal by a timer, a signal detecting an increase in pressure at the supply / discharge port PA, and a detection signal from the outside.

  By turning on the solenoid, the pressure oil from the supply / discharge port PA flows into the third port PT3 from the fourth port PT4 of the switching valve device 11A, moves the moving valve body 25, and the first flow path RR1. Is closed (state shown in FIG. 5). Then, the first check valve CH1 is opened, whereby the second flow path RR2 is communicated (state shown in FIG. 6). 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. And flows into the cylinder chamber BA for high output on the forward side. As a result, the hydraulic cylinder 12 performs high output driving, and the mold is clamped by the mold.

  When the mold clamping is completed, specifically, for example, when the time required for mold clamping has elapsed, the controller 20 turns off the solenoid of the solenoid valve 24 and drives the motor M in the reverse direction. Pressure oil is output from the supply / discharge port PB of the pump 13, and the pressure oil enters the return-side high-speed cylinder chamber CA from the port PTC of the hydraulic cylinder 12 according to the control state of the switching valve device 11B. The return side high output cylinder chamber DA is entered from the PTD. As a result, the rod 121 moves backward at high speed or high output.

  At this time, in the switching valve device 11A, 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.

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

  Since the operation of the switching valve devices 11A and 11B is symmetrical to each other, the operation of the switching valve device 11B when the hydraulic cylinder device 1 moves backward is the operation when the switching valve device 11A described above moves forward. Is the same.

  In this way, by using the switching valve devices 11A and 11B in the hydraulic cylinder device 1, high-speed driving and high-power driving can be performed both in a reciprocating manner with one hydraulic cylinder 12 without providing a pressure oil source in addition to the pump 13. And can be done. 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. The effective pressure receiving area of each cylinder chamber of the hydraulic cylinder 12 does not need to be equal, and the degree of freedom in designing the hydraulic cylinder 12 is high. The manufacturing cost can be reduced accordingly.

  Further, since the first flow path RR1 is normally open in the switching valve devices 11A and 11B, a large amount of pressure oil can be flowed, and the rod 121 can be moved at high speed. The circuit configuration of the hydraulic cylinder device 1 is simplified and the operation is stable. The structure of the switching valve devices 11A and 11B is simple and the whole can be made compact.

  Next, an example of a specific structure of the hydraulic cylinder 12 will be described.

  8, the hydraulic cylinder device 1 includes a rod 121, a piston 122, a cylinder tube 123, cylinder covers 124 and 125, a bush 126, a flange 127, and the like.

  The rod 121 is provided with a hole 131, and a small piston 132 is slidably provided in the hole 131. The small piston 132 is supported and fixed to the cylinder cover 124 by the second tube 133. An inner piston member 134 is provided on the inner peripheral surface of the piston 122 that moves integrally with the rod 121, and the inner peripheral surface of the inner piston member 134 slides closely with the outer peripheral surface of the second tube 133. To do.

  A space surrounded by the small piston 132, the inner piston member 134, the rod 121, and the second tube 133 is a backward side high speed cylinder chamber CA.

  Further, a third tube 135 is provided inside the second tube 133, and the length measuring sensor 18 described above passes through substantially the center of the third tube 135. The space between the third tube 135 and the length measuring sensor 18 is a flow path communicating with the forward-side high-speed cylinder chamber AA, and the pressure oil supplied to the port PTA passes through this flow path. It flows into the forward side high speed cylinder chamber AA.

  Further, the pressure oil supplied to the port PTC passes through the space between the inner peripheral surface of the second tube 133 and the outer peripheral surface of the third tube, and returns from the hole 136 provided in the second tube 133 to the return side high speed. Flows into the cylinder chamber CA.

  Further, the pressure oil supplied to the port PTB flows into the forward movement high output cylinder chamber BA through the hole 137 provided in the cylinder cover 124. The pressure oil supplied to the port PTD flows into the return-side high-power cylinder chamber DA through the gap between the cylinder cover 125 and the outer peripheral surface of the rod 121.

  Note that the hydraulic cylinder 12 is actually joined or positioned by a number of members such as screws and fittings, sealed with packing as necessary, and an appropriate sliding material is mounted on the sliding surface. Assembled.

  The forward-side high-power cylinder chamber BA has a larger effective pressure receiving area than the forward-side high-speed cylinder chamber AA, and the backward-side high-power cylinder chamber DA is more effective than the backward-side high-speed cylinder chamber CA. Large area. Therefore, when pressure oil is supplied to the forward-side high-speed cylinder chamber AA during forward movement, the output is weak but it can be driven at high speed. When pressure oil is supplied to the forward-side high-output cylinder chamber BA, Although it is slow, it can be driven with high power. Similarly, when pressure oil is supplied to the return side high speed cylinder chamber CA at the time of reverse operation, the output is weak but it can be driven at high speed, and if pressure oil is supplied to the return side high output cylinder chamber DA, The speed is slow, but it can be driven with high power.

  As described above, the hydraulic cylinder 12 has the second tube 133 and the third tube 135 provided in the rod 121 in a double manner, the return-side high-speed cylinder chamber CA, the flow path communicating therewith, and the forward-side A flow path communicating with the high speed cylinder chamber AA was provided. As a result, the output can be switched to two stages in the reciprocating motion without increasing the diameter of the rod 121. In addition, since the effective pressure receiving area of the forward-side high-speed cylinder chamber AA and the reverse-side high-speed cylinder chamber CA can be reduced, the speed at high speed can be increased even with a hydraulic cylinder having a large cylinder tube diameter. In addition, the flow rate at high speed is small, so that the capacity of the tank 17 can be reduced.

  Although not shown in the drawing, by providing a pressure sensor for measuring the pressure oil pressure from the supply / discharge port PB of the pump 13 in FIG. ) Can be easily obtained. In addition, various sensors may be provided.

  Next, a hydraulic cylinder device 1B according to another embodiment will be described.

FIG. 9 is a front view of a hydraulic cylinder device 1B according to another embodiment, and FIG. 10 is a plan view of the hydraulic cylinder device 1B.

  The hydraulic cylinder device 1B is obtained by integrating the entire hydraulic cylinder device 1 described above, and the circuit configuration, function, operation, and the like are the same as those of the hydraulic cylinder device 1. Therefore, only the mechanical arrangement and connection state of each element will be described here.

  As shown in FIGS. 9 and 10, the hydraulic cylinder device 1B includes a motor MB, a switching valve device 11C, a hydraulic cylinder 12B, a pump 13B, a tank 17B, a replenishing device HK1B, and the like.

  The switching valve device 11C is arranged so that the first port PT1B is on the replenishing device HK1B side and the second port PT2B and the third port PT3B are on the hydraulic cylinder 12B side, and is sandwiched between the hydraulic cylinder 12B and the tank 17B. In this state, the connectors 31Ba and b communicate with each other.

  The hydraulic cylinder 12B is provided with a length measuring sensor 18B at the axial center. In the pump 13B, the motor MB and the shaft are directly connected and integrated, and are fixed to the hydraulic cylinder 12B by brackets STBa and b. The tank 17B has a built-in manifold in which the replenishing device HK1B is configured.

  Thus, the hydraulic cylinder device 1B is compact and small as a whole, and can be easily driven at a high speed and a high output by the integrated hydraulic cylinder device 1B, so that the usability is very good.

  In the above-described embodiment, the solenoid valve 24 is integrally provided in each of the switching valve devices 11A and 11B. However, the solenoid valve 24 may be provided separately and connected between them by piping. In that case, the switching valve devices 11A and 11B may be configured such that the third port PT3 is exposed on the surface.

  In addition, the first cover 21, the tube 22, the second cover 23, the solenoid valve 24, the moving valve body 25, the spring 26, the switching valve device 11, the hydraulic cylinder 12, and the configuration of the whole or each part of the hydraulic cylinder device 1, 1B, The structure, material, shape, size, number, and the like can be changed as appropriate within the spirit of the present invention.

  The present invention can be used for a mold clamping device, a press-fitting device, a caulking machine, a stamping device, etc. in an injection molding apparatus.

It is a cross-sectional front view which shows the state in the normal state of the switching valve apparatus of one Embodiment of this invention. It is a top view which shows a part of switching valve apparatus in cross section. It is a right view which shows the state which removed the solenoid valve in FIG. It is a fragmentary sectional view of a moving valve body. It is a figure corresponding to FIG. 1 which shows the state in the middle of the switching operation | movement of a switching valve apparatus. It is a figure corresponding to FIG. 1 which shows the state after switching operation | movement of a switching valve apparatus. It is a circuit diagram of a hydraulic cylinder device. It is sectional drawing of a hydraulic cylinder apparatus. It is a front view of the hydraulic cylinder apparatus of other embodiment. It is a top view of a hydraulic cylinder device. It is a circuit diagram of a cylinder device using a conventional profile valve.

Explanation of symbols

1,1B Hydraulic cylinder device (fluid pressure cylinder device)
11, 11A, 11B, 11C Switching valve device 12, 12B Hydraulic cylinder (fluid pressure cylinder)
17, 17B Tank 21 First cover (first cover)
22 Tube 23 Second cover (second cover)
25 Moving valve body 26 Spring (biasing member)
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)
PT4 4th port (4th port)
AA Forward side high speed cylinder chamber (first cylinder chamber)
BA Forward side high output cylinder chamber (second cylinder chamber)
CA Reverse side high speed cylinder chamber (third cylinder chamber)
DA Reverse side high output cylinder chamber (fourth cylinder chamber)

Claims (4)

A fluid pressure cylinder device configured to reciprocate at a high speed or a low speed by controlling a first switching valve device and a second switching valve device,
The first switching valve device and the second switching valve device are respectively
A first port, a second port, and a third port, wherein the second port is switched to communicate with either the first port or the third port; ,
Shut-off valve for blocking the fluid supplied from the outside have been eclipsed set,
An inflow side of the shutoff valve is provided as a fourth port;
The outflow side of the shutoff valve is in communication with the third port;
The fluid pressure cylinder is
A first cylinder chamber provided for forward driving and a second cylinder chamber having an effective pressure receiving area larger than that of the first cylinder chamber, and a third cylinder provided for backward driving A cylinder chamber and a fourth cylinder chamber having an effective pressure receiving area larger than that of the third cylinder chamber,
The fourth port of the first switching valve device is one output port of the bidirectional pump for supplying the first cylinder chamber and the pressurized fluid, the second port is the second cylinder chamber, Each connected to communicate,
The fourth switching valve device is connected so that the fourth port communicates with the third cylinder chamber and the other output port of the bidirectional pump, and the second port communicates with the fourth cylinder chamber. Become,
A fluid pressure cylinder device. A fluid pressure cylinder device configured to reciprocate at a high speed or a low speed by controlling a first switching valve device and a second switching valve device,
The first switching valve device and the second switching valve device are respectively
A first port, a second port, and a third port, wherein the second port is switched to communicate with either the first port or the third port; ,
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 fluid pressure is applied to the third port, the moving valve body moves to the other moving end due to the fluid 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
Furthermore, shut-off valve for blocking the pressure fluid supplied from the outside is set vignetting,
An inflow side of the shutoff valve is provided as a fourth port;
The outflow side of the shutoff valve is in communication with the third port;
The fluid pressure cylinder is
A first cylinder chamber provided for forward driving and a second cylinder chamber having an effective pressure receiving area larger than that of the first cylinder chamber, and a third cylinder provided for backward driving A cylinder chamber and a fourth cylinder chamber having an effective pressure receiving area larger than that of the third cylinder chamber,
A fourth port of the first switching valve device is connected to the first cylinder chamber, and a second port is connected to the second cylinder chamber so as to communicate with each other;
A fourth port of the second switching valve device is connected to the third cylinder chamber, and a second port is connected to the fourth cylinder chamber so as to communicate with each other;
A fluid pressure cylinder device. In each of the first switching valve device and the second switching valve device,
Between the first check valve and the poppet valve body provided on the other moving end side of the moving valve body so as to close the first flow path when the moving valve body is at the other moving end. A second fluid for releasing the pressurized fluid in the flow path communicating with the second port to the fourth port and returning the moving valve body to the one moving end side by the biasing of the biasing member. A check valve is provided,
The fluid pressure cylinder device according to claim 2. A fluid pressure cylinder device configured to reciprocate at a high speed or a low speed by controlling a first switching valve device and a second switching valve device,
The first switching valve device and the second switching valve device are respectively
A first port, a second port, and a third port, wherein the second port is switched to communicate with either the first port or the third port; Tubes,
A first cover for closing one end of the tube;
A second cover for closing the other end of the tube;
A movable valve body capable of reciprocating in the axial direction inside the tube and the first cover;
When the moving valve body is at the moving end on the second cover side, a part of the moving path of the moving valve body is a part of the flow path, and the second port and the first port are communicated with each other. A first flow path provided to
When the moving valve body is at the moving end on the first cover side, the internal flow path provided in the moving valve body is a part of the flow path, and the second port and the third port are A second flow path provided so as to communicate;
A spring member that urges the movable valve body toward the cover side of the two,
The moving valve body is
A poppet valve body that contacts the valve seat provided at the moving end on the first cover side and closes the first flow path;
A first check valve provided integrally with the poppet valve body and allowing only a flow from the third port side to the second port side in the internal flow path;
The poppet valve element is normally separated from the valve seat by the bias of the spring member, and the first flow path is opened.
When fluid pressure is applied to the third port, the moving valve body is moved by the fluid pressure, the poppet valve body abuts on the valve seat, and the first flow path is closed. The first check valve is opened after the flow path is closed and the second flow path is opened,
Furthermore, shut-off valve for blocking the pressure fluid supplied from the outside is set vignetting,
An inflow side of the shutoff valve is provided as a fourth port;
The outflow side of the shutoff valve is in communication with the third port;
The fluid pressure cylinder is
A first cylinder chamber provided for forward driving and a second cylinder chamber having an effective pressure receiving area larger than that of the first cylinder chamber, and a third cylinder provided for backward driving A cylinder chamber and a fourth cylinder chamber having an effective pressure receiving area larger than that of the third cylinder chamber,
A fourth port of the first switching valve device is connected to the first cylinder chamber, and a second port is connected to the second cylinder chamber so as to communicate with each other;
A fourth port of the second switching valve device is connected to the third cylinder chamber, and a second port is connected to the fourth cylinder chamber so as to communicate with each other;
A fluid pressure cylinder device.