JP4504144B2 - On-off valve and hydraulic device for injection control using the on-off valve - Google Patents

Description

  The present invention relates to an on-off valve that selectively switches and connects two inflow passages to one outflow passage, and an injection control hydraulic device that performs injection control and pressure increase control using the on-off valve.

Conventionally, for example, as disclosed in Patent Document 1, in a die casting machine, hydraulic oil is supplied to an injection cylinder via an injection operation intermittent pilot check valve to perform injection control, and the pressure increase cylinder is connected via a pressure increase control valve. The hydraulic oil is supplied to control the pressure increase.
JP 2001-79655 A

  However, in such a conventional system, a check valve that performs injection control and a pressure increase control valve that performs pressure increase control are provided, and hydraulic oil is supplied to the injection cylinder and pressure increase cylinder via hydraulic flow paths, respectively. As a result, the size of the apparatus is increased, and piping according to each flow path must be performed, resulting in a complicated piping work.

  An object of the present invention is to provide an on-off valve that can be miniaturized and that can simplify piping work, and an injection control hydraulic device using the on-off valve.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
A first valve body is slidably inserted into a first insertion hole provided in the valve body, and a sliding hole is formed coaxially with the first insertion hole, and the first hole is formed in the sliding hole. A piston portion formed in one valve body is slidably inserted, a sliding chamber is partitioned by the piston portion to form a working chamber, and sliding of the first valve body by introduction of hydraulic oil into the working chamber is performed. The first inflow channel and the outflow channel are formed so as to be able to cut off communication with each other, and the second valve body is slidably inserted into a second insertion hole provided in the first valve body, The second valve body is formed so that the second inflow channel and the outflow channel can be disconnected by sliding, and the second valve body slides against the valve body against the second valve body. A valve-opening member for communicating the second inflow channel and the outflow channel, and the first valve body blocks the first inflow channel and the outflow channel, and the second A first position where the body blocks the second inflow channel and the outflow channel, and the first valve body communicates between the first inflow channel and the outflow channel and the first A second position that blocks between the second inflow channel and the outflow channel with a two-valve body, and a block between the first inflow channel and the outflow channel with the first valve body; The on-off valve is characterized in that the second valve body has a third position communicating between the second inflow channel and the outflow channel. A first valve seat on which the first valve body is seated is formed in the valve body, and the first inflow passage and the outflow passage are separated by the separation of the first valve body from the first valve seat. A second valve seat on which the second valve body is seated is formed in the first valve body, and when the second valve body is separated from the second valve seat, the second valve seat is separated from the second valve seat. The second inflow channel and the outflow channel are formed so as to be able to cut off communication, and an elastic member for urging the second valve body in the seating direction with respect to the second valve seat is provided, and the opening is opened. It is good also as a structure which moves a valve member and slides a said 2nd valve body against a biasing force of the said elastic member from a said 2nd valve seat in the separation direction.

Further, the first valve body is formed so as to be slidable in a state where the first inflow channel and the outflow channel are blocked, and the second valve body is seated in the first valve body. Forming two valve seats so that communication between the second inflow channel and the outflow channel can be interrupted by separating the second valve body from the second valve seat; and An elastic member for urging the two valve bodies in the seating direction on the second valve seat is provided, and the first valve body is further slid in a state where the first inflow passage and the outflow passage are blocked. When the valve body is moved, the valve opening member fixed to the valve body may slide the second valve body from the second valve seat in the separating direction against the urging force of the elastic member. . Further , the on-off valve is provided, the first inflow passage of the on-off valve is connected to an injection hydraulic source, the outflow passage is connected to an injection cylinder, and the second inflow passage is connected to an injection hydraulic pressure. An injection control hydraulic device may be configured by connecting to a pressure-increasing hydraulic pressure source that is higher than the pressure source.

  Since the on-off valve according to claim 1 of the present invention is provided with the second valve body in the first valve body, the on-off valve can be downsized and the first inflow channel and the second inflow channel can be selectively outflowed. Since it communicates with the road, there is an effect that the number of pipes can be reduced.

  According to a second aspect of the present invention, in addition to the effect of the first aspect of the invention, the first valve body is seated on the first valve seat to block between the first inflow passage and the outflow passage. The second valve body can be seated on the second valve seat to block between the second inflow channel and the outflow channel, and leakage between the respective channels can be reliably prevented.

  According to a third aspect of the present invention, in addition to the effect of the first aspect of the invention, the second valve body is brought into contact with and separated from the valve opening member by the sliding of the first valve body. Since it is separated from the seat, it is not necessary to provide a mechanism for moving the valve opening member, and if the sliding of the first valve body is controlled, the communication interruption by the second valve body can be controlled.

  According to a fourth aspect of the present invention, there is provided a hydraulic device for injection control, which uses the aforementioned on-off valve to perform injection control and pressure increase control without disposing a valve for performing injection control and a valve for performing pressure increase control. This can be done, piping can be reduced, and the apparatus can be miniaturized.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes a valve body. A mounting hole 2, a communication hole 4, and an insertion hole 6 are coaxially connected to the valve body 1 from one side surface to the other side surface. An outflow hole 8 as an outflow channel is connected to the communication hole 4, and a first inflow hole 12 as a first inflow channel is connected to the annular groove 10 formed in the insertion hole 6.

  An insertion member 14 is inserted into the insertion hole 6, a connection hole 16 communicating with the communication hole 4 is formed in the insertion member 14, and a first fitting insertion hole 18 is connected coaxially with the connection hole 16. Has been. Further, a sliding hole 20 is formed coaxially so as to be connected to the first fitting insertion hole 18. A first valve body 22 is slidably inserted into the first insertion hole 18, and the first valve body 22 is a first formed between the connection hole 16 and the first insertion hole 18. It is configured to be seated on the valve seat 24. The first inflow hole 12 is communicated with the first fitting insertion hole 18 through a through hole 27 that communicates the annular groove 26 formed in the first fitting insertion hole 18 and the outer annular groove 10.

  A piston portion 28 is formed in the first valve body 22, and the piston portion 28 is slidably inserted into the sliding hole 20. A plug member 30 is inserted into the insertion hole 6 and a lid member 32 is inserted to close the insertion hole 6. The plug member 30 is formed with a connection hole 33 into which the rear end of the first valve body 22 is slidably inserted.

  The sliding hole 20 is divided into two parts, a valve opening working chamber 20a and a valve closing working chamber 20b, by a piston portion 28, and one flow path hole 34 formed in the valve body 1 is formed in the valve opening working chamber 20a. The first and second flow passage holes 36 are connected to the valve-closing action chamber 20b, respectively, so that the first valve body 22 can be slid in the axial direction by the introduced hydraulic oil.

  A second insertion hole 38 is formed in the first valve body 22 in the axial direction, and the connection hole 40 connected to the second insertion insertion hole 38 is on the outflow hole 8 side of the first valve body 22. An opening is formed in the end face of the. A mounting hole 42 is connected to the second fitting insertion hole 38 on the side opposite to the connection hole 40, and the mounting hole 42 is formed on the end surface on the opposite side.

  A second valve body 44 is slidably inserted into the second insertion hole 38, and the second valve body 44 is a second valve formed between the second insertion hole 38 and the connection hole 40. The seat 46 can be seated. The second valve body 44 is formed with a protrusion 44 a that protrudes into the connection hole 40. The second valve body 44 is formed with a bottomed hole 48 having one end opened on the end surface opposite to the protrusion 44a, and a through hole 50 communicating with the bottomed hole 48 is formed in the radial direction. The through hole 50 is formed so as to be closer to the second fitting insertion hole 38 than the second valve seat 46.

  A stop member 52 is screwed into the mounting hole 42, and an elastic member 54 using a coil spring is disposed between the second valve body 44 and the stop member 52, and the second valve body 44 is moved to the second valve body 44. The two valve seats 46 are biased in the direction of seating. A through hole 56 is formed in the stop member 52 to communicate the second fitting insertion hole 38 and the mounting hole 42. The valve main body 1 and the lid member 32 are formed with a second inflow hole 58 as a second inflow channel communicating with the mounting hole 42 through the connection hole 33.

  A cylinder member 60 is mounted in the mounting hole 2, and a small diameter hole 62 communicating with the communication hole 4 is formed in the cylinder member 60, and a sliding hole 64 communicating with the small diameter hole 62 is formed. Yes. A pilot piston 66 is slidably inserted into the sliding hole 64, and a valve opening member 68 integral with the pilot piston 66 is inserted into the small diameter hole 62, and the valve opening member 68 is a second valve body. 44 is arranged on the same axis so as to be opposed to the protrusion 44 a of 44.

  A lid member 69 is attached to the sliding hole 64 to close the sliding hole 64. The sliding hole 64 is divided into two parts, a valve opening working chamber 64a and a valve closing working chamber 64b by the pilot piston 66. It is partitioned. One flow path hole 70 formed in the valve body 1 and the cylinder member 60 is connected to the valve opening action chamber 64a, and the other flow path hole 72 is connected to the valve closing action chamber 64b. The hydraulic oil can be introduced. By introducing hydraulic oil, the valve opening member 68 can be moved forward and backward in the axial direction via the pilot piston 66.

  As shown in FIG. 1, the valve opening member 68 is a pilot piston when the first valve body 22 is seated on the first valve seat 24 and the second valve body 44 is seated on the second valve seat 46. When 66 is retracted, it is formed so as to be in a separated state without contacting the projection 44a of the second valve body 44. Further, in this state, when the pilot piston 66 is advanced, the valve opening member 68 comes into contact with the projection 44a, and the second valve body 44 is slid against the urging force of the elastic member 54, and the second valve The body 44 is configured to be separated from the second valve seat 46.

Next, the operation of the on-off valve of the first embodiment described above will be described.
First, as shown in FIG. 1, hydraulic fluid is supplied to the valve closing chamber 20 b through the flow path hole 36, and the first valve body 22 is slid through the piston portion 28 so as to slide the first valve seat 24. The first inflow hole 12 and the outflow hole 8 are blocked from each other. Further, hydraulic fluid is supplied to the valve closing chamber 64 b through the flow path hole 72, the pilot piston 66 is moved backward, and the valve opening member 68 is separated from the protrusion 44 a of the second valve body 44. Thus, the second valve body 44 is seated on the second valve seat 46 by the urging force of the elastic member 54, and is set to the first position where the second inflow hole 58 and the outflow hole 8 are blocked.

  From this state, when hydraulic fluid is supplied to the valve opening working chamber 20a through the flow path hole 34, the first valve body 22 slides in the first fitting insertion hole 18 through the piston portion 28, and FIG. As shown in (a), the first valve body 22 is separated from the first valve seat 24, and the first inflow hole 12 and the outflow hole 8 are communicated with each other. Even when the first valve body 22 slides in the first insertion hole 18, the second valve body 44 is seated on the second valve seat 46 together with the first valve body 22 by the urging force of the elastic member 54. Moving. Accordingly, the second inflow hole 58 and the outflow hole 8 are set to the second position in which the state of being blocked is maintained.

  On the other hand, when hydraulic fluid is supplied to the valve opening working chamber 64a through the flow path hole 70 from the state of the first position (position shown in FIG. 1), the pilot piston 66 moves forward, and FIG. As shown in FIG. 5, the valve opening member 68 hits the protrusion 44 a of the second valve body 44 and separates the second valve body 44 from the second valve seat 46 against the urging force of the elastic member 54. Thus, the second inflow hole 58 is set to the third position communicating with the outflow hole 8.

  Thus, since the 2nd valve body 44 was provided in the 1st valve body 22, it can reduce in size. Further, the first inflow hole 12 and the second inflow hole 58 are selectively communicated with the outflow hole 8, that is, the two inflow channels can be selectively switched to one outflow channel, Compared with the case where the flow path is switched to two outflow paths, the number of pipes connected to the outflow path can be reduced.

  Further, the first valve body 22 is seated on the first valve seat 24 to block between the first inflow hole 12 and the outflow hole 8, and the second valve body 44 is seated on the second valve seat 46 and the second valve seat 46 is seated. 2 Since the gap between the inflow hole 58 and the outflow hole 8 is blocked, leakage can be reliably prevented.

Next, an injection control hydraulic apparatus using the above-described on-off valve will be described with reference to FIG.
The first inflow hole 12 is connected to an injection accumulator 82 as an injection hydraulic source via an injection flow path 80. The outflow hole 8 is connected to the head side port of the injection cylinder 84 via a supply flow path 86. The second inflow hole 58 is connected to a pressure increasing accumulator 90 as a pressure increasing hydraulic pressure source higher than the injection accumulator 82 via a pressure increasing flow path 88. The injection flow path 80 is connected to the tank 106 via an electromagnetic opening / closing valve 126 and a variable throttle 128.

  The hydraulic pressure source 92 is connected to the rod side port of the injection cylinder 84 via a switching valve 94, and a relief valve 95 is provided along with the switching valve 94. The hydraulic pressure source 92 is connected to the injection flow path 80 via a high pressure flow path 96 and an electromagnetic on-off valve 98. The high pressure channel 96 is also connected to the pressure increasing channel 88 via the electromagnetic on-off valve 100. The high-pressure channel 96 is connected to the tank 106 via the electromagnetic on-off valve 102 and the variable throttle 104.

  A pilot flow path 108 is connected to the high pressure flow path 96, and the pilot flow path 108 is connected to the electromagnetic switching valve 110, and the electromagnetic switching valve 110 and one flow path hole 34 are connected to each other, and the electromagnetic switching is performed. The valve 110 and the other flow path hole 36 are connected via a pilot check valve 112. The electromagnetic switching valve 110 connects the pilot flow path 108 and the flow path hole 34, and connects the flow path hole 36 to the tank 106 via the pilot check valve 112, and connects the flow path hole 34 to the tank 106. In addition, the holding position 110b for connecting the flow path hole 36 to the tank 106 via the pilot check valve 112, the pilot flow path 108 to the flow path hole 36 via the pilot check valve 112, and the flow path hole 34 A blocking position 110 c connected to the tank 106 is provided.

  The pilot flow path 108 is connected to the electromagnetic switching valve 114, and is connected to the flow path holes 70 and 72 via the electromagnetic switching valve 114. The electromagnetic switching valve 114 connects the pilot channel 108 and the channel hole 72 and connects the pilot channel 108 and the channel hole 70 together with the valve closing position 114a that connects the channel hole 70 to the tank 106 and flows. And a valve opening position 114 b for connecting the passage hole 72 to the tank 106.

  Further, the pilot flow path 108 is connected to an electromagnetic switching valve 118 via a variable throttle 116, and the electromagnetic switching valve 118 is connected to the injection flow path 86 via a pilot check valve 120 and a variable throttle 122, and is variable. A check valve 124 is attached to the throttle 122. The electromagnetic switching valve 118 includes a supply position 118 a for connecting the pilot flow path 108 to the injection flow path 86 via the pilot check valve 120 and the variable throttle 122, and the tank 106 via the variable flow 122 and the pilot check valve 120 for the injection flow path 86. A holding position 118b connected to the pilot passage 108, and a return position 118c connecting the pilot passage 108 and the pilot check valve 120 to connect the injection passage 86 to the tank 106 via the variable throttle 122 and the pilot check valve 120.

Next, the operation of the hydraulic control device for injection control according to this embodiment will be described.
First, the electromagnetic on-off valve 126 and the electromagnetic on-off valve 102 are excited to be in a closed state, the electromagnetic on-off valve 100 is excited to be in a closed state, and the electromagnetic on-off valve 98 is in a non-excited open state. As a result, pressure is accumulated from the hydraulic source 92 to the injection accumulator 82. When the injection accumulator 82 reaches the set pressure, the electromagnetic on-off valve 98 is excited by a signal from the pressure switch 130 to be in a closed state.

  Next, the electromagnetic on-off valve 100 is opened in a non-excited state, and pressure is accumulated from the hydraulic source 92 to the pressure increasing accumulator 90. When the pressure increasing accumulator 90 reaches the set pressure, the electromagnetic on-off valve 100 is excited by a signal from the pressure switch 132 to be in a closed state. The set pressure of the pressure increasing accumulator 90 is higher than the set pressure of the injection accumulator 82.

  Thereafter, the electromagnetic on-off valve 98 is opened without being excited, and the high-pressure hydraulic oil of the injection accumulator 82 is supplied to the pilot flow path 108 and used as part of the pilot fluid.

  When the electromagnetic switching valve 110 is switched to the injection position 110a in this state, pilot fluid is supplied from the pilot flow path 108 to the valve opening working chamber 20a. Further, the pilot pressure is applied to the pilot check valve 112 to be opened, and the hydraulic oil in the valve closing chamber 20 b is discharged to the tank 106 through the pilot check valve 112. Therefore, the first valve body 22 is switched to the second position where the first valve body 22 is separated from the first valve seat 24.

  As a result, hydraulic fluid is supplied from the injection accumulator 82 to the head side chamber of the injection cylinder 84 through the injection flow path 80, the first inflow hole 12, the outflow hole 8, and the supply flow path 86. And discharged to the tank 106 to start injection. The speed control of the injection cylinder 84 is performed by meter-out control for restricting the outlet-side flow path by the switching valve 94.

  When the injection control is completed, the electromagnetic switching valve 110 is switched to the cutoff position 110c. The pilot fluid is supplied to the valve closing chamber 20b, and the first valve body 22 is seated on the first valve seat 24. Therefore, the injection channel 80 and the supply channel 86 are blocked. Thereafter, the electromagnetic switching valve 110 is switched to the holding position 110b, the pilot check valve 112 is closed, and the pilot fluid introduced into the valve closing chamber 20b is prevented from flowing out into the tank 106 by the pilot check valve 112. The seating state of the first valve body 22 is maintained.

  Next, when the electromagnetic switching valve 114 is excited and switched to the valve opening position 114b, the pilot fluid is introduced into the valve opening working chamber 64a, and the pilot fluid in the valve closing working chamber 64b is discharged to the tank 106, and the pilot piston 66 is discharged. Is moved forward. Therefore, the valve-opening member 68 abuts against the protrusion 44 a of the second valve body 44 and switches to the third position in which the second valve body 44 is separated from the second valve seat 46.

  Therefore, the hydraulic oil is supplied from the pressure increasing accumulator 90 to the head side chamber of the injection cylinder 84 through the pressure increasing flow path 88, the second inflow hole 58, the outflow hole 8, and the supply flow path 86, and pressure increase control is started. At this time, the speed of the injection cylinder 84 is controlled by meter-out control by the switching valve 94 as described above.

  When the pressure increase control is completed and the electromagnetic switching valve 114 is switched to the valve closing position 114a, the pilot fluid is introduced into the valve closing operation chamber 64b, the pilot piston 66 moves backward, and the second valve body 44 is moved to the elastic member. The urging force of 54 is switched to the first position where the second valve seat 46 is seated and closed, and the pressure increasing flow path 88 and the supply flow path 86 are blocked.

  When the solenoid valve 118 is switched to the return position 118c in the state where the pressure increase control of the injection cylinder 84 is completed, the pilot check valve 120 is opened, and hydraulic oil is supplied to the rod side chamber via the switch valve 94. The hydraulic fluid in the head side chamber is discharged to the tank 106 through the variable throttle 122 and the pilot check valve 120. Therefore, the injection cylinder 84 is returned to the original position. When the electromagnetic switching valve 118 is switched to the holding position 118b, the pilot check valve 120 is closed and the injection cylinder 84 is stopped. The pilot fluid is supplied from the injection accumulator 82 to the pilot channel 108 via the supplementing channel 136 in which the check valve 134 is interposed, and the pilot fluid in the pilot channel 108 is supplemented.

  Thus, by using the on-off valve provided with the second valve body 44 in the first valve body 22, the injection control and the valve for performing the pressure increase control can be performed without any special arrangement. Since pressure increase control can be performed and only one supply flow path 86 is required, the number of pipes can be reduced, and the apparatus can be downsized.

Next, the on-off valve of the second embodiment will be described with reference to FIGS. The same members as those of the above-described on-off valve of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
In the second embodiment, a first fitting insertion hole 202 is provided in the valve body 201, and a spool-type first valve body 204 is slidably fitted into the first fitting insertion hole 202. Yes. An annular groove 206 is formed in the first fitting insertion hole 202, and the first inflow hole 12 is communicated with the annular groove 206.

  In addition, a sliding groove 208 is formed in the first fitting insertion hole 202, and the piston portion 210 of the first valve body 204 is slidably inserted into the sliding groove 208 to close the sliding groove 208. The valve action chamber 208a and the valve opening action chamber 208b are partitioned. The valve closing chamber 208a and the valve opening chamber 208b are connected to the electromagnetic switching valve 110 via pilot check valves 212 and 214.

  Similarly to the first embodiment described above, the first valve body 204 is formed with a second insertion hole 38, and the second valve body 44 is slidably inserted into the first valve body 204 by the elastic member 54. The seat 46 is biased so as to be seated. A protrusion 44 a provided on the second valve body 44 protrudes from the connection hole 40, and a valve opening member 216 is fixed to the valve body 201 so as to face the protrusion 44 a.

  As shown in FIG. 4, when the piston portion 210 of the first valve body 204 is substantially in the middle of the sliding groove 208, the first valve body 204 closes the annular groove 206, and the first inflow hole 12 and the outflow hole 8, the projection 44a of the second valve body 44 is separated from the valve opening member 216, the second valve body 44 is seated on the second valve seat 46, the second inflow hole 58 and the outflow hole 8 is a first position where the distance between the first position and the second position is blocked.

  When the electromagnetic switching valve 110 is switched to the injection position 110a from this state, the pilot check valve 212 is opened by the pilot fluid, the pilot fluid is supplied to the valve opening working chamber 208b, and the pilot check is performed from the valve closing working chamber 208a. Pilot fluid is discharged into the tank via valve 212. Therefore, as shown in FIG. 5 (a), the first valve body 204 slides in the first insertion hole 202, the annular groove 206 is opened, and the first inflow hole 12 and the outflow hole 8 are annular. The position is switched to the second position communicated through the groove 206 and the first insertion hole 202.

  Further, when the electromagnetic switching valve 110 is switched to the cutoff position 110c from the state of the first position shown in FIG. 4, the pilot check valve 214 is opened by the pilot fluid, and the pilot fluid is supplied to the valve closing chamber 208a. The pilot fluid is discharged from the valve opening chamber 208 b to the tank 106 through the pilot check valve 214. Therefore, as shown in FIG. 5B, the first valve body 204 further slides in the first insertion hole 202 while the annular groove 206 is closed. The second valve body 44 also moves together with the first valve body 204, the projection 44a hits the valve opening member 216, and the second valve body 44 is separated from the second valve seat 46 against the urging force of the elastic member 54. The As a result, the second inflow hole 58 and the outflow hole 8 communicate with each other via the second fitting insertion hole 38, the bottomed hole 48, the through hole 50, the connection hole 40, and the first fitting insertion hole 202. Switch to 3 position.

  For switching to the first to third positions, a position sensor (not shown) for detecting the sliding position of the first valve body 204 is provided, and electromagnetic switching is performed according to the position of the first valve body 204 detected by the position sensor. The valve 110 may be switched and controlled.

  Thus, the on-off valve of the second embodiment can be reduced in size because the second valve body 44 is provided in the first valve body 204 as in the first embodiment described above. Further, the first inflow hole 12 and the second inflow hole 58 are selectively communicated with the outflow hole 8, that is, the two inflow channels can be selectively switched to one outflow channel, Compared with the case where the flow path is switched to two outflow paths, the number of pipes connected to the outflow path can be reduced. Further, since the second valve body 44 comes into contact with and separates from the valve opening member 216 and is separated from the second valve seat 46 by sliding of the first valve body 204, a mechanism for moving the valve opening member 216. It is sufficient to control the sliding of the first valve body 204.

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

It is a longitudinal cross-sectional view of the on-off valve as one Embodiment of this invention. It is operation | movement explanatory drawing of the on-off valve of this embodiment. It is a circuit diagram of the hydraulic device for injection control using the on-off valve of this embodiment. It is a block diagram of the on-off valve as 2nd Embodiment. It is operation | movement explanatory drawing of the on-off valve of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,201 ... Valve body 8 ... Outflow hole 12 ... 1st inflow hole 18, 202 ... 1st insertion hole 20 ... Sliding hole 22,204 ... 1st valve body 24 ... 1st valve seat 28,210 ... Piston part 34, 36, 70, 72 ... channel hole 38 ... second fitting insertion hole 44 ... second valve element 44a ... projection 46 ... second valve seat 54 ... elastic member 58 ... second inflow hole 60 ... cylinder member 66 ... pilot Pistons 68, 216 ... Valve opening member 80 ... Injection flow path 82 ... Injection accumulator 84 ... Injection cylinder 86 ... Supply flow path 86 ... Injection flow path 88 ... Pressure increase flow path 90 ... Pressure increase accumulator 92 ... Hydraulic pressure source 94 ... Switching valve 96: High-pressure flow path 98, 100, 102, 110, 114, 118, 126 ... Electromagnetic switching valve 106 ... Tank 108 ... Pilot flow path 130, 132 ... Pressure switch 136 ... Supplementary flow path

Claims (4)

A first valve body is slidably inserted into a first insertion hole provided in the valve body, and a sliding hole is formed coaxially with the first insertion hole, and the first hole is formed in the sliding hole. A piston portion formed in one valve body is slidably inserted, a sliding chamber is partitioned by the piston portion to form a working chamber, and sliding of the first valve body by introduction of hydraulic oil into the working chamber is performed. The first inflow channel and the outflow channel are formed so as to be able to cut off communication with each other, and the second valve body is slidably inserted into a second insertion hole provided in the first valve body, The second valve body is formed so that the second inflow channel and the outflow channel can be disconnected by sliding, and the second valve body slides against the valve body against the second valve body. A valve-opening member for communicating the second inflow channel and the outflow channel, and the first valve body blocks the first inflow channel and the outflow channel, and the second A first position where the body blocks the second inflow channel and the outflow channel, and the first valve body communicates between the first inflow channel and the outflow channel and the first A second position that blocks between the second inflow channel and the outflow channel with a two-valve body, and a block between the first inflow channel and the outflow channel with the first valve body; An on-off valve having a third position where the second valve body communicates between the second inflow channel and the outflow channel. A first valve seat on which the first valve body is seated is formed in the valve body, and the first inflow passage and the outflow passage are separated by the separation of the first valve body from the first valve seat. A second valve seat on which the second valve body is seated is formed in the first valve body, and when the second valve body is separated from the second valve seat, the second valve seat is separated from the second valve seat. The second inflow channel and the outflow channel are formed so as to be able to cut off communication, and an elastic member for urging the second valve body in the seating direction with respect to the second valve seat is provided, and the opening is opened. 2. The on-off valve according to claim 1, wherein the valve member is moved to slide the second valve body from the second valve seat in a separating direction against the urging force of the elastic member. The first valve body is further slidably formed in a state of blocking between the outflow channel and the first inflow channel, a second valve, wherein the second valve body to the first valve body is seated Forming a seat so that communication between the second inflow passage and the outflow passage can be interrupted by attaching and detaching the second valve body to and from the second valve seat; and the second valve An elastic member for urging the body in the seating direction on the second valve seat is provided, and the first valve body is further slid in a state where the first inflow passage and the outflow passage are blocked. claims when in, characterized in that said valve opening member fixed to said valve body to slide the second valve body against the urging force in the separating direction from the second valve seat of the elastic member Item 2. The on- off valve according to Item 1 . The on-off valve according to claim 1, wherein the first inflow passage of the on-off valve is connected to an injection hydraulic source, the outflow passage is connected to an injection cylinder, and the second An injection control hydraulic apparatus, wherein the inflow passage is connected to a pressure-increasing hydraulic pressure source that is higher in pressure than the injection hydraulic source.

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