KR101835691B1 - Auxiliary valve for hydraulic operation - Google Patents

Abstract

The present invention provides a hydraulic operation-auxiliary valve, which is able to compensate for the difference between volume flow rates of hydraulic fluids flowing into/out of one side space and the other side space of a hydraulic actuator, respectively, and is able to prevent operation of a hydraulic actuator adapted to an external load in a neutral state where the operation of a bidirectional hydraulic pump has been stopped. Accordingly, the hydraulic operation-auxiliary valve comprises a first opening and closing device, a second opening and closing device, a first check valve and second check valve. The first opening and closing device and the second opening and closing device are installed in a first operation space and second operation space of a body block, respectively, and are interlinked by a push bar to allow a compensation flow path of the body block to be selectively connected to one of the first operation space and second operation space, which is lower. The first check valve and second check valve are installed in a space between a first actuator connection flow path connected to the hydraulic actuator and the first operation space and in a space between a second actuator connection flow path and the second operation space, respectively. It is possible to forcibly open the first and second check valves by moving the push bar by the first opening and closing device and the second opening and closing device.

Description

AUXILIARY VALVE FOR HYDRAULIC OPERATION

More particularly, the present invention relates to a hydraulic operation assistant valve which automatically compensates for a difference in volume flow rate input and output to both ports during operation of a hydraulic actuator such as a single-rod cylinder operated by a bidirectional hydraulic pump, To a hydraulic actuating auxiliary valve installed between a hydraulic actuator and a bidirectional hydraulic pump in order to prevent the occurrence of an operation of the hydraulic actuator by the hydraulic actuator.

A hydraulically operated single rod cylinder is widely used for an apparatus requiring large thrust such as an injection molding machine, a construction machine, a cylinder for steering a ship, and a hydrometric drive device in which a rod is connected to one end of a piston to reciprocate linearly in a cylinder body.

Such a single-rod cylinder is constituted and operated by an electrohydrostatic actuator (EHA) apparatus including a servo motor, a bidirectional hydraulic pump, a low oil tank, and the like. The control can easily control the flow rate, pressure and direction of the piston required for the system.

In the hydraulic hydraulic hybrid actuator device, the hydraulic fluid enters and exits from the ports at both ends by the bidirectional hydraulic pump when the single rod cylinder is contracted and extended. However, due to the structure in which the rod is installed only at one end of the piston, There is a need to compensate for this difference.

1 is a circuit diagram showing a conventional electrohydraulic hybrid actuator device.

1, in the conventional apparatus, there are provided a single rod cylinder 2, a first supply line 3 and a second supply line 4 connected to the cylinder for supply and discharge of operating oil, Way hydraulic pump 5 connected to the hydraulic pump 4, 4.

When the hydraulic oil is supplied to one side space of the cylinder body 2a through the first supply line 3 by the unidirectional rotation of the bidirectional hydraulic pump 5, Rod cylinder 2 can be extended while the working oil in the space is discharged to the second supply line 4 and the working oil is supplied to the other space of the cylinder body 2a through the second supply line 4, The working fluid in one space of the body 2a can be discharged to the first supply line 3 and the single rod cylinder 2 can be retracted.

At this time, due to the structure in which the rod body and the other side space of the cylinder body 2a are installed so that the rod crosses only the other space, the volume of the hydraulic fluid accommodated in the cylinder body 2a is different from each other, In order to prevent the behavior, a volume flow compensating means 6 and a storage tank 7 may be provided between the first supply line 3 and the second supply line 4 to compensate the operating fluid according to the flow rate difference .

The volume flow compensating means 6 includes a first check valve 6a having one side connected to the first supply line 3 and the other side connected to the storage tank 7 and a second check valve 6b having one side connected to the second supply line 4 And a second check valve 6b connected to the storage tank 7 on the other side.

A pilot pipe 6d connecting one side of the first check valve 6a and the second supply line 4 and a pilot pipe 6d connecting one side of the second check valve 6b and the first supply line 3 So that the check valves can be switched on and off according to the operating oil supply direction of the bidirectional hydraulic pump 5.

The shortage of the hydraulic oil due to the volume difference at the time of extension of the single rod cylinder 2 is transmitted from the storage tank 7 to the bidirectional hydraulic pump 5 through the connection passage 8 and the second supply line 4 The excess amount of the operating oil at the time of contraction of the single rod cylinder 2 can be supplied to the first supply line 3 and the connecting flow path 8 from the one side space of the cylinder body 2a In the storage tank 7 as shown in FIG.

However, in the above-mentioned electrohydraulic hybrid actuator device, the rotation of the bi-directional hydraulic pump 5 and the linear motion of the single-rod cylinder 2 are stopped, and the external load F may act on the rod.

In this case, the external load F is generated by pushing or pulling the rod so that the working oil filled in one space or the other space of the cylinder body 2a is forcedly discharged through the first supply line 3 and the second supply line 4 Directional hydraulic pump 5 is forced to rotate, and there is a problem that an operation of adapting to an external load occurs without maintaining the position where the rod of the single rod cylinder 2 is stopped.

Korean Patent Registration No. 10-1692408 Korean Patent Registration No. 10-1570390

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a hydraulic actuator, such as a single-rod cylinder operated by a bidirectional hydraulic pump, And it is an object of the present invention to provide a hydraulic operation auxiliary valve that can compensate for a difference between flow rates and can prevent the occurrence of an operation of a hydraulic actuator in accordance with an external load in a stationary state in which the operation of the bidirectional hydraulic pump is stopped.

The hydraulic actuating auxiliary valve for compensating for the difference between the flow rates of the hydraulic oil flowing in and out of the one side space and the other side space of the hydraulic actuator when the hydraulic actuator is operated by the bidirectional hydraulic pump, A first operation space and a second operation space which are communicated with the compensation passage and extend from both sides of the compensation passage, respectively, and a second operation space which is connected to the rear end of the first operation space, A first actuator connecting passage and a second actuator connecting passage formed to communicate with the rear end of the second actuating space and respectively connecting the first actuating space and the second actuating space to one space and the other space of the hydraulic actuator, And a second pumping line connected to the first working space and the second working space and connected to one pumping line and the other pumping line of the bidirectional hydraulic pump, The body block including a second pump flow path; The first operating space and the second operating space, wherein the first operating space and the second operating space are interlocked with each other by the push bar so that the compensating flow path is selectively communicated to the lower hydraulic pressure side of the first operating space and the second operating space, And a second opening / closing device; And a second actuator connecting passage provided between the first actuator connecting passage and the first actuating space and between the second actuating actuator connecting passage and the second actuating space so that operating oil flows into the first actuating space and the second actuating space, And a first check valve and a second check valve for respectively disconnecting the first check valve and the second check valve when the hydraulic pressure is generated in the reverse direction, The first check valve and the second check valve can be forcibly opened.

In addition, the present invention is characterized in that, in the above-described configuration, when the hydraulic pressure difference between the first operating device and the second operating device occurs in the first operating space and the second operating space, And pushing the check valve provided on the lower side of the first check valve and the second check valve to forcibly open the check valve.

Further, the present invention is characterized in that, in the above-described configuration, the push bar includes a first push bar engaged with the first open / close device, and a second push bar engaged with the second open / close device, The bar is arranged so that its outer ends are pushed against each other with the first check valve and the second check valve in a state in which they are arranged in a line so that their inner end portions opposed to each other are pressed against each other, do.

Further, the present invention is characterized in that, in the above-described configuration, the first opening and closing device is provided in the first operating space and has a first cylinder-shaped member in which a cylinder space is disposed in a direction toward the second opening- A first push bar insertion hole through which the first push bar passes is formed to open / close a flow passage connecting the compensation flow passage and the first operation space by back and forth movement in a direction from the cylinder space of the first switch device to the second switch device, A first sliding space communicating with the first push bar insertion hole and opening rearward and having a diameter larger than that of the first push bar insertion hole is formed, and the first sliding space is moved in the direction toward the second opening / And a first piston block located in the first sliding space and performing a piston movement in a direction toward the second opening / closing device And the second opening and closing device includes a second cylinder-shaped member installed in the second operating space and having a cylinder space disposed in a direction toward the first opening and closing device, and a second cylinder-shaped member disposed in the cylinder space of the second cylinder- A second push bar insertion hole through which the second push bar passes is formed to open and close a flow passage connecting the compensation passage and the second operation space by back and forth movement in a direction toward the opening and closing device, A second sliding space having a diameter larger than that of the second push bar insertion hole is formed in the rear side of the second opening and closing member and communicated with the second opening and closing spring, And a second piston block located in the second sliding space and performing a piston movement in a direction toward the first opening / closing device, wherein the first push bar and the second push block Is fixed to the first piston block and the second piston block, respectively, and the first push bar and the second push bar are installed at the front end of the first push bar and the second push bar, respectively, and are engaged with the first open / close operation member and the second open / And a first engaging head and a second engaging head located between the first opening and closing operation member and the second opening and closing operation member.

In addition, the present invention is characterized in that, in the above-described configuration, the length of the push bar is set such that, when the hydraulic pressure by the bidirectional hydraulic pump is completely removed from the first operating space and the second operating space, In a state where a hydraulic pressure difference is generated between the first operating space and the second operating space without pushing the first check valve and the second check valve so that the check valve can be closed, The hydraulic pressure is set to a range that allows the check valve provided on the lower one of the first and second check valves to be opened when the hydraulic pressure in the space is moved to the lower side.

Further, in the present invention, an external poppet portion formed by chamfering a corner with a diagonal line is formed around the front end of the first opening and closing operation member to form an annular line contact with an end jaw of the flow path connecting the compensation passage and the first operation space Wherein the first pumping passage has a front end branch passage and a rear end branch passage that are branched and connected to the front end portion and the rear end portion of the first operation space and that the rear end branch passage is closed around the front end portion of the second opening and closing operation member, And an outer poppet portion chamfered by an oblique line is formed to establish an annular line contact with an end jaw of the flow path connecting the compensation flow path and the second working space to seal the flow path and the second pumping flow path is branched, The first opening and closing operation member is retracted by having the front end branch passage and the rear end branch passage connected to the front end portion and the rear end portion of the space, Closing operative member is retracted so that the outer poppet portion of the second openable and closable operation member is separated from the end jaw so that the compensating flow passage communicates with the first operating space and the first pumping flow passage, And communicates the compensation passage with the second working space and the second pumping passage.

According to another aspect of the present invention, there is provided a hydraulic operation assisting valve for compensating for a difference between flow rates of hydraulic oil flowing into and out of a hydraulic actuator, the hydraulic operation assist valve comprising: a compensation channel formed to connect with an external low- A first operating space and a second operating space extending from both sides of the compensation passage respectively in the directions of both sides and a rear end portion of the first operating space and a rear end portion of the second operating space, A first actuator connecting flow path and a second actuator connecting flow path for connecting the operating space to one space and the other space of the hydraulic actuator respectively and a second actuator connecting flow path communicating with the first operating space and the second working space, A body block including a first pumping passage and a second pumping passage for connecting to the pumping line and the other pumping line, respectively; A push bar installed to pass through the first operation space and the second operation space; The first operating space and the second operating space, wherein the first operating space and the second operating space are coupled to each other by the first operating space and the second operating space, respectively, An opening and closing device and a second opening and closing device; And a second actuator connecting passage provided between the first actuator connecting passage and the first actuating space and between the second actuating actuator connecting passage and the second actuating space so that operating oil flows into the first actuating space and the second actuating space, A first check valve and a second check valve capable of forcibly opening when the push bar is moved by the first opening / closing device or the second opening / closing device, respectively; Wherein the first check valve and the second check valve block the flow path without interference of the push bar in a state where the hydraulic pressure by the bidirectional hydraulic pump is removed from the first operation space and the second operation space State.

In addition, the present invention is characterized in that, in the above-described configuration, when the hydraulic pressure difference between the first operating device and the second operating device occurs in the first operating space and the second operating space, And pushing the check valve provided on the lower side of the first check valve and the second check valve to forcibly open the check valve.

Further, the present invention is characterized in that, in the above-described configuration, the first opening and closing device and the second opening and closing device are provided on both sides symmetrically with each other, and the push bar is provided with a first push bar and a second push & Wherein the first push bar and the second push bar are arranged so as to be aligned in a row and contact each other so that their inner ends oppose each other, A first cylinder-shaped member provided in the first cylinder-shaped member and having a cylinder space disposed in a direction toward the second opening and closing apparatus, and a second cylinder-shaped member provided in the cylinder space of the first cylinder- A first push bar insertion hole through which the first push bar passes, and a second push bar insertion hole communicating with the first push bar insertion hole, A first opening and closing operation member formed with a first sliding space having a larger diameter than the first pushbar insertion hole and receiving an elastic force to move in a direction toward the second opening and closing device by a first opening and closing spring, And a first piston block positioned in the first sliding space and piston-moving in a direction toward the second opening / closing device, wherein the second opening / closing device is installed in the second operating space, A second cylinder-shaped member having a space therebetween, and a flow path connecting the compensation passage and the second operation space by opening and closing the flow passage in the cylinder space of the second cylinder-shaped member in the direction toward the first opening and closing device A second push bar insertion hole through which the second push bar passes is formed, and the second push bar insertion hole communicates with the second push bar insertion hole and opens rearward, A second opening and closing operation member having a second sliding space having a larger diameter and receiving an elastic force to move in a direction toward the first opening and closing device by a second opening and closing spring, Wherein the first push bar and the second push bar are fixed to the first piston block and the second piston block, respectively, and the first push bar and the second piston block are respectively fixed to the first piston block and the second piston block, The push bar is provided with a first latching head which is respectively provided at the front end portion thereof and which is engaged with the first opening and closing operation member and the second opening and closing operation member and which is positioned between the first opening and closing operation member and the second opening and closing operation member, 2 latching head.

The hydraulic actuating auxiliary valve according to the present invention is characterized in that a first operating space and a second operating space are provided in a body block and a first opening and closing device and a second opening and closing device are interlocked with each other by a push bar, The operation of the hydraulic actuator such as the single-rod cylinder operated by the bi-directional hydraulic pump compensates for the difference between the flow rates of the hydraulic oil flowing into and out of the one side space and the other side space of the hydraulic actuator, can do.

Further, the hydraulic operation assistant valve according to the present invention is characterized in that a first check valve and a second check valve are provided between the first actuator connecting passage and the first working space, and between the second actuator connecting passage and the second working space, respectively , The operation of the hydraulic actuator adapted to the external load can be prevented in the neutral state in which the operation of the bidirectional hydraulic pump is stopped.

The hydraulic operation assistant valve according to the present invention is configured such that the first check valve and the second check valve are forced to be opened by moving the push bars by the first and second opening and closing devices, The first check valve or the second check valve that cuts off the discharge of the hydraulic oil from the hydraulic actuator in the neutral state in which the operation of the hydraulic pump is stopped and the bidirectional hydraulic pump expands or contracts the hydraulic actuator It is possible to smoothly compensate for the difference between the flow rates of the hydraulic oil flowing into and out of the one space and the other space of the hydraulic actuator.

1 is a circuit diagram of a conventional electrohydraulic hybrid actuator device
2 is a schematic view of a hydraulic actuating device equipped with a hydraulic actuating auxiliary valve according to an embodiment of the present invention
3 is a structural explanatory view showing an exploded configuration of the hydraulic operation assisted valve according to the embodiment of the present invention
4 is an explanatory view for explaining an action of the hydraulic actuator being extended in the hydraulic actuator equipped with the hydraulic actuating auxiliary valve according to the embodiment of the present invention
5 is an explanatory view explaining an operation of contracting the hydraulic actuator in the hydraulic actuating apparatus provided with the hydraulic actuating auxiliary valve according to the embodiment of the present invention
FIG. 6 is a view showing a state in which when the bi-directional hydraulic pump and the hydraulic actuator of the hydraulic actuating apparatus equipped with the hydraulic actuating auxiliary valve according to the embodiment of the present invention are stopped and an external load acts on the rod of the hydraulic actuator, Explanation of operation explaining the action of

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The hydraulic actuating auxiliary valve according to an embodiment of the present invention is applied to a hydraulic actuating device known as an Electro Hydrostatic Actuator (EHA) system.

2 and 3, the hydraulic pressure operating device of the present embodiment is configured to supply hydraulic oil to one pumping line 11 and suck hydraulic oil from the other pumping line 12 when rotating in one direction, A bidirectional hydraulic pump 10 for supplying hydraulic oil to the pumping line 12 and sucking operating oil from the one pumping line 11 and one side space 21 and the other side space 22 partitioned by the piston 25 A hydraulic actuator 20 in which the hydraulic fluid is operated to move into and out of the one side space 21 and the other side space 22 by the bi-directional hydraulic pump 10 and the other side space 21 and the other side space 22, And a hydraulic operation auxiliary valve 30 for compensating for the difference between the flow rates of the hydraulic oil flowing into and out of the hydraulic oil supply valve 30 respectively.

Specifically, the bi-directional hydraulic pump 10 may be a gear pump having a drive gear and a driven gear connected to the servo motor 15 so that the suction and discharge directions can be reversed.

The bidirectional hydraulic pump 10 controls the speed, torque, and rotation direction of the servo motor 15 so that the delivery flow rate, delivery pressure, and delivery direction of the hydraulic oil can be controlled, The operating speed, the operating load, and the operating direction of the main body 20 can be controlled.

When the bidirectional hydraulic pump 10 sucks the working fluid of the other pumping line 12 and sends it to the one pumping line 11, the hydraulic actuator 20 is driven to be extended and the bidirectional hydraulic pump 10 is driven to the one pumping line 11. [ When the hydraulic fluid in the hydraulic pump 11 is sucked and sent to the other pumping line 12, the hydraulic actuator 20 is contracted and driven.

That is, when the working oil flows into the space 21 at one side of the hydraulic actuator 20 through the one pumping line 11, the piston 25 moves in the direction in which the hydraulic actuator 20 is extended, When the hydraulic oil is discharged through the other pumping line 12 and the hydraulic oil flows into the other space 22 of the hydraulic actuator 20 through the other pumping line 12, The operating fluid of the one space 21 is discharged through the one pumping line 11. [

In this specification, the bidirectional hydraulic pump 10 is not only a pump capable of pumping in both directions by reversing the rotational direction of the rotary shaft, but also rotating in only one direction, The pumping line 11 and the pumping line 12 can be reversed in direction and direction.

The hydraulic actuator 20 has a space 21 and a space 22 partitioned by a piston 25 and formed inside the bidirectional hydraulic pump 10 The operating oil flows into the one side space 21 and the other side space 22 and is operated.

The hydraulic actuator 20 is configured such that one side space 21 partitioned by the piston 25 is connected to one side discharge portion of the bidirectional hydraulic pump 10 through one pumping line 11 and the other side space 22 is connected to the other side And is connected to the other discharge portion of the bi-directional hydraulic pump 10 through the pumping line 12. [

The volume of one space 21 and the volume 22 of the other side of the hydraulic actuator 20 are different from each other due to the rod 26 protruding only in one direction so as to cross the other side, It is necessary to compensate for the difference in the flow rate of the operating oil flowing into and out of the space 22 so that smooth operation is possible.

The hydraulic operation assistant valve 30 is provided to compensate for the difference between the flow rates of the hydraulic oil flowing into and out of the hydraulic actuator 20 operated by the bidirectional hydraulic pump 10.

That is, when the hydraulic actuator 20 is extended, a shortage of the hydraulic oil flows into the other pumping line 12 from the low oil tank 90 and replenished. When the hydraulic actuator 20 is contracted, To the low oil tank 90 and stored.

2 and 3, the hydraulic actuating auxiliary valve 30 of the present embodiment having such an action includes a compensating passage 49 formed for connecting to the external low-pressure reservoir 90, A body block 40 having a first working space 41 and a second working space 42 extending in both lateral directions from the compensation flow passage 49 and communicating with the first working space 41 and the second working space 42, A push bar 70 installed to penetrate the operation space 42 and a push bar 70 installed in the first operation space 41 and the second operation space 42. The push bar 70 is engaged with the push bar 70, And a first opening and closing device 50 and a second opening and closing device 60 for selectively communicating the compensating flow passage 49 to the lower hydraulic pressure in the first operating space 41 and the second operating space 42.

The body block 40 forms a body of the hydraulic actuating auxiliary valve 30 and includes a compensation flow passage 49 connected to an external low oil reservoir 90 at a central portion thereof, The first operating space 41 and the second operating space 42 formed on both sides of the operating space 41 and the second operating space 42 are formed to extend in both directions, And are disposed symmetrically with respect to each other.

The body block 40 is connected to the rear end of the first operating space 41 and the rear end of the second operating space 42 so as to communicate with the first operating space 41 and the second operating space 42 A first actuator connecting flow path 43 and a second actuator connecting flow path 44 connecting the first operating space 41 and the second operating space 41 to one space 21 and the other space 22 of the hydraulic actuator 20, And a first pumping passage 45 and a second pumping passage 46 which are connected to the second working space 42 and connected to the first pumping line 11 and the second pumping line 12, respectively.

The body block 40 is formed such that the compensation passage 49 communicates with the outside and the first and second operation spaces 41 and 42 are disposed on both sides of the compensation passage 49, And the first working space 41 and the second working space 42 communicate with the first pumping passage 45 and the second pumping passage 46 disposed on both sides of the compensation passage 49, And also communicates with the first actuator connecting flow path 43 and the second actuator connecting flow path 44.

The compensation flow passage 49 communicates with the intermediate portion of the through passage 47 that communicates the first operation space 41 and the second operation space 42 so that the first operation space 41 and the second operation space 42 .

The through passage 47 provides a space in which the push bar 70 is disposed and can move.

The first pumping passage 45 has front end and rear end branch passages 45a and 45b that are branched and connected to the front end and the rear end of the first operating space 41. The front end branch passage 45a is connected to the first pumping passage And the rear end branch flow passage 45b is provided at the rear end of the first opening and closing operation member 52 and the first piston block 53 to be described later, The pressure of the operating oil flowing from the oil passage 45 is applied and communicated with the rear portion of the first operating space 41 so as to communicate with the first driver connecting oil passage 43. [

The second pumping passage 46 also includes front and rear branch passages 46a and 46b, and the construction and operation of the second pumping passage 46 are the same as those of the first pumping passage 45. [

The first and second operating spaces 41 and 42 are provided with a first opening / closing device 50 and a second opening / closing device 60, respectively, which form a symmetrical structure facing each other.

The first opening and closing device 50 and the second opening and closing device 60 are interlocked with each other by the push bar 70 so that the compensation flow passage 49 can be opened and closed in the first operation space 41 and the second operation space 42, To selectively communicate with the lower side.

The first opening and closing device 50 includes a first cylindrical member 51 disposed in the first operating space 41 and having a cylinder space 51C disposed in a direction toward the second opening and closing device 60, And a flow path connecting the compensation flow path 49 and the first working space 41 by back and forth in the direction from the cylinder space 51C of the first cylindrical member 51 toward the second opening and closing device 60 The first push bar insertion hole 52a through which the first push bar 71 passes is formed. The first push bar insertion hole 52a communicates with the first push bar insertion hole 52a. Closing operating member 52 that receives an elastic force to move in the direction toward the second opening / closing device 60 by the first opening / closing spring 54. The first opening / closing operation member 52 And a first piston block 53 located in the first sliding space 52b and performing a piston movement in a direction toward the second opening / closing device 60.

The flow passage connecting the compensation flow passage 49 and the first operation space 41 is formed by a through passage 47 for communicating the first operation space 41 and the second operation space 42 with each other in the body block 40 And through holes 51g and 61g directly connected to the through passages 47 at the respective front ends of the first and second cylindrical members 51 and 61, The cylinder space 51c of the first cylinder member 51 and the cylinder space 51c of the second cylinder member 61 are connected to each other by the passage of the operating oil from the compensation passage 49 into the first and second working spaces 41 and 42, And the hydraulic oil flows into the cylinder space 61c.

The first cylinder-shaped member 51 is provided so as to be in close contact with the inner circumferential surface of the first operating space 41 and the cylinder space 51c therein forms a columnar space arranged toward the second opening / closing apparatus 60 It is possible to perform the piston movement in which the first opening and closing operation member 52 reciprocates in the direction toward the second opening and closing device 60 in the cylinder space.

The cylinder space 51c of the first cylinder-shaped member 51 is provided so that the first cylinder-shaped member 51 surrounds the inner cylinder space 51c along the outer periphery of the first operating space 41, The cylinder space 51c of the first cylinder member 51 is formed in the working space 41 in such a manner that the cylinder space 51c of the first cylinder member 51 communicates with the first working space 41, And constitutes a part of the operating space 41. [

The first cylinder-shaped member 51 is provided with communication holes 51a and 51b so that the first pumping passage 45 can communicate with the first operation space 41. The first pumping passage 45 is formed with the first The communication holes 51a and 51b have the front end portion and the rear end branch flow paths 45a and 45b branched and connected to the front end portion and the rear end portion of the cylinder shaped member 51, End communication hole 51a and a rear-end communication hole 51b respectively formed at the rear end portion and the rear end portion.

The front end branch passage 45a and the front end communication hole 51a of the first pumping passage 45 are connected to the compensation flow passage 49 at the time of backward movement of the first opening and closing operation member 52, The pumping passage 45 is quickly connected to allow the hydraulic oil to flow in and out through the compensation passage 49 quickly.

On the other hand, the first open / close operation member 52 has a cylindrical shape and slidably opens and closes a flow passage connecting the compensation flow passage 49 and the first operation space 41.

To this end, an outer poppet portion 52c chamfered by a diagonal line is formed around the front end of the first opening and closing operation member 52, so that the end portion of the flow path connecting the compensation flow passage 49 and the first operation space 41 And an annular line contact is made with the jaw 51f.

Accordingly, the flow of the operating oil can be shut off from the outside of the first opening and closing operation member 52.

The minute oil outflow of the first operating member 52 through the first pushbar insertion hole 52a is blocked by the inner poppet 53c formed in an annular shape on the front surface of the first piston block 53. [ The inner poppet 53c is linearly contacted with the end step 52d of the first push bar insertion hole 52a so that the flow of the hydraulic fluid through the first push bar insertion hole 52a can be blocked .

The first opening and closing operation member 52 can cooperate with the first piston block 53 to completely close the flow passage connecting the compensation flow passage 49 and the first operation space 41 and to move backward, The flow path can be opened. The double poppet structure of the external poppet portion 52c and the internal poppet portion 53c can exhibit excellent closing performance even if the machining tolerance or the assembly tolerance is relatively increased, thereby facilitating the manufacture of the device.

The first push bar insertion hole 52a of the first opening and closing operation member 52 is installed in the direction toward the second opening and closing device 60 so that the first push bar 71 can be inserted and moved forward and backward, A first sliding space 52b having a larger diameter than the first push bar insertion hole 52a is formed in the opening and closing operation member 52 in communication with the first push bar insertion hole 52a and rearward.

Since the first piston block 53 is installed in the first sliding space 52b to perform the piston movement and the first piston block 53 moves integrally with the first push bar 71, The piston block 53 receives the pressure and can advance / retreat the first push bar 71 while moving back and forth. The first piston block 53 and the first push bar 71 may be separated from each other and then fixed to each other. Alternatively, the first piston block 53 and the first push bar 71 may be integrally formed and fixed to each other.

The first opening and closing spring 54 is provided at the rear of the first opening and closing operation member 52 to push the first opening and closing operation member 52 in the direction toward the second opening and closing device 60, The first opening and closing operation member 52 can move to a position for closing the flow path connecting the compensation flow passage 49 and the first operation space 41 by the elastic force.

The first block spring 53a is provided on the inner side of the first opening and closing spring 54 to the rear of the first piston block 53 so that the first piston block 53 moves in the direction toward the second opening / closing device 60 And the first piston block 53 is pushed to the inside of the first sliding space 52b.

For reference, in the present specification, in consideration of the fact that the first and second operating spaces, the first and second opening and closing devices, etc., are opposed to each other in the forward and backward directions such as the front end, the rear end, And the direction toward the central portion is referred to as forward and the opposite side is referred to as the rear.

On the other hand, the second opening and closing apparatus 60 has the same symmetrical structure as that of the first opening and closing apparatus 50 facing each other.

That is, the second opening / closing apparatus 60 includes a second cylinder-shaped member 61 provided in the second operating space 42 and having a cylinder space 61c disposed in a direction toward the first opening / closing device 50, Closing the flow passage connecting the compensation flow passage 49 and the second operation space 42 by back and forth movement in the cylinder space of the second cylinder-shaped member 61 in the direction toward the first opening and closing device 50, A second push bar insertion hole 62a through which the push bar 72 passes is formed and communicates with the second push bar insertion hole 62a and opens rearward and has a larger diameter than the second push bar insertion hole 62a Closing operation member (62) formed with a second sliding space (62b) having a second opening / closing spring (64) and receiving an elastic force to move in the direction toward the first opening / closing device (50) And a second piston block 63 located in the second sliding space 62b and performing piston motion in the direction toward the first opening and closing device 50. [

The second opening and closing device 60 also has a double poppet structure of an outer poppet portion 62c and an inner poppet portion 63c like the first opening and closing device 50 and the first and second piston blocks 53, A second piston block 63, a second opening / closing spring 64 and a second block spring 63a corresponding to the first opening / closing spring 54 and the first block spring 53a are provided in the same manner.

The push bar 70 is installed so as to pass through the first operating space 41 and the second operating space 42. The first and second switching devices 50 and 60 are connected to the compensation flow path The first and second open / close devices 50 and 60 are interlocked with each other so that the first and second operation spaces 41 and 49 are selectively operated to selectively communicate the oil pressure in the first and second operation spaces 41 and 42 .

The push bar 70 includes a first push bar 71 coupled to the first opening and closing device 50 and a second push bar 71 connected to the second opening and closing device 60 as a member separated from the first push bar 71. [ The first push bar 71 and the second push bar 72 are arranged in a line and contact each other at the through passages 47 so that the respective inner ends facing each other push each other .

The first push bar 71 and the second push bar 72 are connected to the check balls 81a and 82a of the first check valve 81 and the second check valve 82, Respectively. That is, when the first push bar 71 and the second push bar 72 are pushed to the left or the right to push the check balls 81a and 82a located at the rear, the first check valve 81 or the second check The valve 82 can be forcibly opened.

The first push bar 71 is provided with a first engagement head 71a which is engaged with the first open / close operation member 52 on the opposite side of the first piston block 53 with the first push bar insertion hole 52a interposed therebetween. Is installed.

The first latching head 71a is provided at the front end of the first push bar 71 and is connected to the first latching head 72a of the second push bar 72 together with the first opening and closing operation member 52, 2 open / close operation member (62).

The first engaging head 71a has an outer diameter larger than that of the first push bar inserting hole 52a so that when the first push bar 71 is retracted, the first engaging head 71a is engaged with the first open / close operation member 52 And the first pawl operating member is retracted together.

A second latching head 72a is installed at the front end of the second push bar 72 so as to be symmetrical with respect to the first push bar 71 and hooked to the second opening and closing operation member 62.

The hydraulic actuating auxiliary valve 30 of the present embodiment is provided with a first actuating member 41 and a second actuating member 41 which are provided between the first actuator connecting passage 43 and the first actuating space 41 and between the second actuating actuator connecting passage 44 and the second actuating space 42 A first check valve 81 and a second check valve 82 are provided.

The first check valve 81 is provided between the first actuator connecting flow path 43 and the first working space 41 at a rear position of the first working space 41 and is connected to the first actuator connecting flow path 43 Is communicated with the first operating space 41 through the first check valve 81. [

The first check valve 81 prevents the working oil from flowing into the first working space 41 from the first actuator connecting flow path 43 and prevents the first working space 41 from flowing into the first working space 41 when the hydraulic pressure is generated in the reverse direction, When the hydraulic fluid is to be introduced into the actuator connecting passage 43, the hydraulic passage 81c is opened by the hydraulic pressure.

The second check valve 82 is disposed between the second actuator communication passage 44 and the second operation space 42 at a position rearward of the second operation space 42 so that the second actuator communication passage 44 Is communicated with the second operating space 42 through the second check valve 82. [

The second check valve 82 blocks the flow of the working oil from the second actuator connecting flow path 44 into the second working space 42 and opens the flow path 82c when the hydraulic pressure pushing in the opposite direction is generated.

The first check valve 81 and the second check valve 82 are provided symmetrically with respect to each other and are provided with check balls 81a and 82a for closing the flow path and check balls 81a and 82a, And check springs 81b and 82b for supporting the first and second check valves 81c and 82c so as to be able to be closed by an elastic force.

The first piston block 53 and the second piston block 63 are moved in the first operating space 41 and the second operating space 42 in a state in which the hydraulic pressure by the bidirectional hydraulic pump 10 is removed, The first and second check valves 81 and 82 can form a state in which the flow path is blocked without interfering with the push bar 70 because the pushbars 70 are positioned at the neutral position . However, when the push bar 70 is moved to one side or the other side by the first opening / closing device 50 or the second opening and closing device 60, the flow path can be forcibly opened from the pushing valve on the pushing side.

In a state in which the bidirectional hydraulic pump 10 is not operated, that is, in a state where the hydraulic pressure by the bidirectional hydraulic pump 10 is completely removed from the first and second working spaces 41 and 42, The first check valve 81 and the second check valve 82 do not push the first check valve 81 and the second check valve 82 on both sides so that the operating oil of the first check valve 81 and the second check valve 82 do not come out, .

For this, the maximum length of the push bar 70 that can be set at the time of manufacture is set so that the first check valve 81 and the second check valve 82 check the first check valve 81 Is a length corresponding to the distance between the ball 81a and the check ball 82a of the second check valve 82. [

However, the length of the push bar 70 is set to be shorter than the length of the first opening and closing device 50 and the second opening and closing device 60 in a state in which a hydraulic pressure difference is generated between the first operating space 41 and the second operating space 42, The hydraulic pressure of the first check valve 81 and the second check valve 82 is lower than that of the first check valve 81 and the second check valve 82 when the push bar 70 is moved to the lower hydraulic pressure among the first and second operating spaces 41, If the check valve provided on the lower side can not be pushed, the operating oil of the hydraulic actuator 20 is not discharged, so that the hydraulic operation assistant valve 30 of the present invention can not operate normally.

The push bar 70 being moved is moved between the first check valve 81 and the second check valve 82 in a state where a hydraulic pressure difference is generated between the first and second operation spaces 41 and 42, The length of the push bar 70 should be set within a range that can satisfy both of the condition and the maximum length condition.

The first engaging head 71a and the second engaging head 72a of the push bar 70 are engaged with each other in a state where the first push bar 71 and the second push bar 72 are in contact with each other, The first opening and closing operation member 52 and the second opening and closing operation member 62 are provided so as to block the connection between the first operating space 41 and the second operating space 42 and the compensation flow path 49. [ And the second openable and closable operation member 62 are not disturbed.

That is, when the supply of the working oil to either one of the first working space 41 and the second working space 42 is in the same neutral state, the hydraulic oil pressurized by the bidirectional hydraulic pump 10 is supplied to the compensation flow path The first openable and closable operation member 52 and the second openable and closable operation member 62 must be able to block the flow of the working oil to the compensation flow path 49 so that the first and second engagement heads 71a, The head 72a should be installed at the position of the push bar 70 not obstructed by the movement of the first openable and closable operation member 52 and the second openable operation member 62 to the closed position as shown in FIG.

Hereinafter, the operation of the hydraulic actuating auxiliary valve 30 according to the embodiment of the present invention will be described in detail.

First, referring to FIG. 4, as the bidirectional hydraulic pump 10 rotates, the hydraulic oil is supplied to one pumping line 11 and the hydraulic oil is sucked in the other pumping line 12, The operation process is explained.

When the working oil is supplied to the one pumping line 11, the working oil having a predetermined pressure flows into the first pumping passage 45 into the first working space 41 communicated with the first pumping line 11, And also flows into the cylinder space 51c of the constituent first cylinder-shaped member 51 to press the respective members.

The working oil in the first working space 41 is pressurized and the check ball 81a of the first check valve 81 is pushed out so that one space 21 of the hydraulic cylinder and the first working space 41 are communicated with each other, Is introduced into one side space (21) of the cylinder and the hydraulic actuator (20) is stretched.

The operating oil supplied to the first operating space 41 pushes the first piston block 53 to the inside of the sliding space and moves the first push bar 71 in the direction in which the second opening and closing device 60 is located Push it out. At this time, since the first opening and closing operation member 52 is pushed by the operating oil and is pushed in the direction in which the second opening and closing device 60 is located by the first opening and closing spring 54, The flow path through which the space 41 is connected is blocked.

The outer poppet portion 52c of the first opening and closing operation member 52 is pressed against the end stop 51f of the flow passage connecting the compensation flow passage 49 and the first operating space 41 in the pressurized state of the operating oil, And the inner poppet portion 53c formed in an annular shape on the front surface of the first piston block 53 is pressed against the end protrusion 52d of the first push bar insertion hole 52a in an annular line contact And blocks the flow of the working oil through the first pushbar insertion hole 52a.

This allows the first opening and closing device 50 to completely block the flow of the hydraulic fluid between the compensation passage 49 and the first operating space 41.

With the generation of the above action, the operating oil must be discharged in the other space 22 of the hydraulic actuator 20, and the discharged working oil flows into the second working space 42.

That is, the first push bar 71 pushed by the operating oil in the first operating space 41 pushes the second push bar 72 whose inner ends are in contact with each other, so that the second push bar 72 is moved rearward The hydraulic oil can be allowed to flow into the second working space 42 by pushing and forcing the second check valve 82 while moving.

When the second push bar 72 is moved while the second openable and closable operation member 62 is engaged with the second engaging head 72a and moves backward together, Is closed and communicated with each other.

The reason that the compensation flow path 49 and the second working space 42 and the second pumping path 46 can be quickly communicated from the start of the backward movement of the second opening and closing operation member 62 is that, End branching flow path 46a and the rear end branching flow path 46b branched and connected to the front end portion and the rear end portion of the second operating space 42 and the second opening and closing operation member 62 is disposed on the periphery of the front end portion And an external poppet portion 62c chamfered by an oblique line.

That is, when the second opening and closing operation member 62 starts to move backward, the outer poppet portion 62c of the second opening and closing operation member 62 is separated from the end jaw 61f, (46a) immediately communicates.

The hydraulic fluid discharged from the other space 22 of the hydraulic actuator 20 flows into the second working space 42 through the forcibly opened second check valve 82 and is communicated with the second working space 42 Way hydraulic pump 10 through the two-pumping flow path 46. As shown in FIG.

At this time, the flow rate of the hydraulic fluid supplied from the bidirectional hydraulic pump 10 to one side space 21 of the hydraulic actuator 20 and the hydraulic fluid sucked from the other side space 22 of the hydraulic actuator 20, Differences arise due to the structure of the hydraulic actuator 20. [ That is, the flow rate of the bidirectional hydraulic pump 10 sucked from the other space 22 is smaller than the flow rate to be supplied to the space 21 at one side of the hydraulic actuator 20.

This difference in flow rate is caused by the operation of the second openable and closable operation member 62 which is pushed rearward together with the second push bar 72 and the compensation flow path 49 and the second operation space 42 and the second pumping flow path 46 The shortage of the hydraulic oil sucked into the bidirectional hydraulic pump 10 can be absorbed from the outer oil reservoir 90 through the compensation passage 49 and the second operation space 42 It is.

5, the bidirectional hydraulic pump 10 rotates in the opposite direction to supply the hydraulic fluid to the other pumping line 12 and suck the hydraulic fluid from the one pumping line 11, Desc / Clms Page number 2 >

When the working oil is supplied to the other pumping line 12, the working oil having a predetermined pressure flows into the second pumping passage 46 and flows into the communicated second working space 42, and a part of the second working space 42 And also flows into the cylinder space of the constituent second cylinder-shaped member 61 to press each member.

The working oil in the second working space 42 is pressurized and the check ball 82a of the second check valve 82 is pushed out so that the one space 21 of the hydraulic cylinder and the second working space 42 are communicated with each other, And flows into the other space 22 of the cylinder to contract the hydraulic actuator 20. [

The operating oil supplied to the second operating space 42 moves the second piston block 63 to the inside of the sliding space and moves the second push bar 72 in the direction in which the first opening and closing device 50 is located Push it out. At this time, since the second opening and closing operation member 62 is pushed by the operating oil and is pushed in the direction in which the first opening and closing device 50 is located by the second opening and closing spring 64, The flow path through which the space 42 is connected is blocked.

The external poppet portion 62c of the second openable and closable operation member 62 in the pressurized state of the operating oil contacts the end edge protrusion 61f of the flow passage connecting the compensation flow passage 49 and the second operation space 42, And the inner poppet part 63c formed in an annular shape on the front surface of the second piston block 63 is pressed against the end step 62d of the second push bar insertion hole 62a by an annular line contact And blocks the flow of hydraulic oil through the second pushbar insertion hole 62a.

Thus, the second opening / closing apparatus 60 can completely shut off the flow of the hydraulic fluid in the compensation passage 49 and the second operating space 42.

With the occurrence of the above action, in the space 21 on one side of the hydraulic actuator 20, the operating oil must be discharged, and the discharged working oil flows into the first operating space 41.

That is, the second push bar 72 pushed by the operating oil in the second operating space 42 pushes the first push bar 71 whose inner ends are in contact with each other, so that the first push bar 71 is moved rearward The operating oil can be allowed to flow into the first working space 41 by pushing and forcing the first check valve 81 while moving.

The first opening and closing operation member 52 is engaged with the first engaging head 71a and moves backward together with the movement of the first push bar 71 so that the compensation flow path 49 and the first operating space 41 are closed, Is closed and communicated with each other.

The hydraulic fluid discharged from one side space 21 of the hydraulic actuator 20 flows through the first check valve 81 forcibly opened into the first working space 41 and communicated with the first working space 41 Directional hydraulic pump 10 through the first pumping passage 45 which has been opened.

At this time, the flow rate of the hydraulic fluid supplied to the other space 22 of the hydraulic actuator 20 by the bidirectional hydraulic pump 10 and the hydraulic fluid sucked from the space 21 on one side of the hydraulic actuator 20, Differences arise due to the structure of the hydraulic actuator 20. [ In other words, the flow rate to be sucked from the one side space 21 is larger than the flow rate to be supplied to the other side space 22 of the bidirectional hydraulic pump 10 by the hydraulic actuator 20.

This difference in flow rate is eliminated by the communication of the compensation flow passage 49 and the first operating space 41 by the operation of the first opening and closing operation member 52 pushed rearward together with the first push bar 71, The surplus portion of the hydraulic fluid discharged from the space 21 at one side of the hydraulic actuator 20 by the suction pressure of the bidirectional hydraulic pump 10 flows into the first working space 41 and the front end branching flow path of the first pumping path 45 45a and the compensating flow passage 49 to be stored in the external low-pressure reservoir 90 and stored.

In the description of the above-described operation related to the one-directional and the other-directional pumping of the bidirectional hydraulic pump 10, the first working space 41 and the second working space 42 are connected to each other by the bidirectional hydraulic pump 10 The open / close device provided on the higher one of the first operating space 41 and the second operating space 42 moves the push bar 70 to a lower oil pressure, It can be seen that an action of making

This is an operation in which the check valve provided on the lower side of the hydraulic pressure of the first check valve 81 and the second check valve 82 is forcedly opened by the push bar 70 at all times.

That is, on the side where the suction pressure of the bidirectional hydraulic pump 10 is generated, the check valve can not be opened by the pressure of the hydraulic oil due to the structure of the hydraulic actuating auxiliary valve 30 of the present embodiment, The push bar 70 is forcibly opened to discharge the operating oil.

However, when the operation of the bidirectional hydraulic pump 10 is stopped and the pumping oil pressure is removed in the first operation space 41 and the second operation space 42 as described later, the first check valve 81 and the second check valve 2 check valve 82 operates normally and interference by the push bar 70 does not occur.

Referring to FIG. 6, when the bidirectional hydraulic pump 10 stops rotating and the hydraulic actuator 20 is stopped and an external load acts on the rod 26 of the hydraulic actuator 20 in this state, The operation when the actuator 20 is to be contracted or stretched will be described.

When the rotation of the bidirectional hydraulic pump 10 is stopped, no hydraulic pressure is supplied to supply the hydraulic oil to the first pumping passage 45 and the second pumping passage 46. Therefore, the first check spring 81b and the second check The first check valve 81 and the second check valve 82 block the flow path by the elastic force of the spring 82b.

At the same time, the first opening and closing operation member 52 and the second opening and closing operation member 62 are advanced by the elastic force of the first opening and closing spring 54 and the second opening and closing spring 64, respectively, 52 and the outer poppet portions 52c, 62c of the second opening and closing operation member 62 are connected to the respective end portions of the flow path connecting the compensation flow path 49 and the first operation space 41 and the second operation space 42 After the annular line contact with the jaws 51f and 61f, respectively, it waits at the closed position.

The first block spring 53a and the second block spring 63a push the first piston block 53 and the second piston block 63 with the same elastic force, The operating oil in the second working space 42 has the same pressure so that the push bar 70 maintains the neutral state without interfering pushing the first check valve 81 and the second check valve 82 at the intermediate position .

In such a state, even if an external load acts on the rod 26 of the hydraulic actuator 20 to push or pull the rod 26 to one side or the other side of the hydraulic actuator 20, the first check valve 81 and the second The operating fluid of the one space 21 and the space 22 of the other space are discharged through the first check valve 81 and the second check valve 82, And the operation of the hydraulic actuator 20, which complies with the external load, does not occur.

As described above, the hydraulic operation assistant valve 30 of the present embodiment has the function of the push bar 70 for forcibly opening the first check valve 81 or the second check valve 82, so that in the neutral state, The bidirectional hydraulic pump 10 exerts the unique action of the first check valve 81 or the second check valve 82 for shutting off the discharge of the operating oil of the hydraulic motor 20 and the bidirectional hydraulic pump 10, It is possible to compensate for the difference between the flow rates of the hydraulic oil flowing into and out of the one space 21 and the other space 22 of the hydraulic actuator 20 in spite of the intrinsic action thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the particular embodiments set forth herein. It goes without saying that other modified embodiments are possible.

10; A hydraulic pump 11; One pumping line
12; The other pumping line 20; Hydraulic actuator
21; One side space 22; The other side space
30; Hydraulic actuating auxiliary valve 40; Body block
41; A first operating space 42; The second working space
43; A first actuator connecting flow path 44; The second actuator-
45; A first pumping passage 46; The second pumping channel
49; Compensation Euro 50; The first opening and closing device
51; The first cylinder-shaped member 51f; Jaw
52; The first opening and closing operation member 52a; The first push bar insertion hole
52b; A first sliding space 53; The first piston block
60; A second opening / closing device 61; The second cylinder-
61f; A step 62; The second open /
62a; A second push bar insertion hole 62b; The second sliding space
63; A second piston block 70; Push bar
71; A first push bar 71a; The first latching head
72; A second push bar 72a; The second latching head
81; A first check valve 82; The second check valve
90; Low oil tank

Claims (10)

A hydraulic actuation auxiliary valve for compensating for a difference between flow rates of hydraulic oil flowing into and out of one space and the other space of the hydraulic actuator when the hydraulic actuator is operated by a bidirectional hydraulic pump,
A first operation space and a second operation space which are communicated with the compensation passage and extend from both sides of the compensation passage, respectively, and a second operation space which is connected to the rear end of the first operation space, A first actuator connecting passage and a second actuator connecting passage formed to communicate with the rear end of the second actuating space and respectively connecting the first actuating space and the second actuating space to one space and the other space of the hydraulic actuator, And a second actuating space communicating with the first actuating space and the second actuating space and being connected to the one pumping line and the other pumping line of the bidirectional hydraulic pump, A body block including a first pumping passage and a second pumping passage;
The first operating space and the second operating space, wherein the first operating space and the second operating space are interlocked with each other by the push bar so that the compensating flow path is selectively communicated to the lower hydraulic pressure side of the first operating space and the second operating space, And a second opening / closing device; And
And a second actuator communicating passage provided between the first actuator connecting passage and the first actuating space and between the second actuating actuator connecting passage and the second actuating space, A first check valve and a second check valve for respectively interrupting the inflow of operating oil from the second actuator connecting passage to the second operating space and for opening the flow paths when the hydraulic pressure is generated in the opposite directions,
The first check valve and the second check valve can be forcibly opened by moving the push bar by the first opening and closing device and the second opening and closing device,
Wherein the first actuator connecting passage and the first pumping passage are formed with a passage through which the working oil can flow with each other by connecting the first working spaces to each other, And the hydraulic operating auxiliary valve is formed by connecting the second operating spaces to each other, delete The method according to claim 1,
The first opening / closing device and the second opening /
When the hydraulic pressure difference is generated between the first operating space and the second operating space, the push bar is moved toward the lower one of the first operating space and the second operating space, and the first check valve and the second check valve The check valve installed on the lower side of the hydraulic pressure is forced to open,
Wherein the push bar includes a first push bar coupled with the first opening and closing device and a second push bar coupled with the second opening and closing device,
Wherein the first push bar and the second push bar comprise:
Wherein the first and second check valves are disposed such that inner end portions facing each other are arranged in a line so as to push each other out so that the respective outer end portions can be pushed out and opened against the first check valve and the second check valve, respectively. The method of claim 3,
The first opening and closing device
A first cylinder-shaped member installed in the first operating space and having a cylinder space disposed in a direction toward the second opening / closing device;
Closing the flow passage connecting the compensation passage and the first operating space by back and forth movement in a direction from the cylinder space of the first cylinder member toward the second opening and closing device, A first opening and closing operation member having a push bar insertion hole formed therein and having a first sliding space communicating with the first push bar insertion hole and opening rearward and having a larger diameter than the first push bar insertion hole,
And a first piston block located in the first sliding space and piston-moving in a direction toward the second opening / closing device and fixed to the first push bar,
The second opening and closing device
A second cylinder-shaped member installed in the second operating space and having a cylinder space disposed in a direction toward the first opening / closing device;
And a second flow path connecting the compensation flow path and the second operation space by opening and closing a flow path connecting the compensation flow path and the second operation space in a direction from the cylinder space of the second cylindrical member toward the first opening and closing device, A second opening / closing operation member having a push bar insertion hole formed therein, a second sliding space communicating with the second push bar insertion hole, having a rear portion thereof opened and a second sliding space having a larger diameter than the second pushbar insertion hole,
And a second piston block located in the second sliding space and piston-moving in a direction toward the first opening / closing device and fixed to the second push bar. 5. The method of claim 4,
Wherein the first opening and closing operation member receives an elastic force to move in the direction toward the second opening and closing device by the first opening and closing spring and the second opening and closing operation member is urged toward the first opening and closing device by the second opening and closing spring Lt; RTI ID = 0.0 > direction,
The first push bar and the second push bar are respectively installed at the front end thereof and are respectively engaged with the first opening and closing operation member and the second opening and closing operation member. The first and second push bars are located between the first opening and closing operation member and the second opening and closing operation member The first latching head and the second latching head, 5. The method of claim 4,
The length of the push-
The first check valve and the second check valve are closed so that the first check valve and the second check valve can be closed when the hydraulic pressure by the bidirectional hydraulic pump is removed from the first operation space and the second operation space, Without pushing the second check valve,
When the push bar is moved to a lower oil pressure in the first operating space and the second operating space in a state where a hydraulic pressure difference between the first operating space and the second operating space is generated, Characterized in that the hydraulic operating auxiliary valve is set in a condition that a check valve provided on the lower side of the valve can be pushed open 5. The method of claim 4,
An outer poppet portion formed by chamfering a corner with a diagonal line around the front end portion of the first opening and closing operation member is formed to establish line contact with an end jaw of the flow path connecting the compensation flow passage and the first operation space, ,
Wherein the first pumping passage has a front end branch passage branched to the front end portion and a rear end portion of the first operation space and a rear end branch passage,
An outer poppet portion formed by chamfering a corner with a diagonal line around the front end portion of the second opening and closing operation member forms an annular line contact with an end jaw of the flow path connecting the compensation flow passage and the second operation space, ,
The second pumping passage is branched and has a front end branch passage and a rear end branch passage connected to the front end portion and the rear end portion of the second operation space,
Wherein when the first opening and closing operation member is retracted to separate the outer poppet portion of the first opening and closing operation member from the end jaw, the compensation passage is communicated with the first working space and the first pumping passage,
And the second operating space and the second pumping passage are communicated with each other when the second opening and closing operation member is retracted to separate the outer poppet portion of the second opening and closing operation member from the end jaw. valve A hydraulic actuation auxiliary valve for compensating for a difference between flow rates of hydraulic oil flowing into and out of a hydraulic actuator,
A first operation space and a second operation space which are communicated with the compensation passage and extend from both sides of the compensation passage, respectively, and a second operation space which is connected to the rear end of the first operation space, A first actuator connecting flow channel and a second actuator connecting flow channel formed to communicate with the rear end of the first and second working spaces, respectively, for connecting the first and second working spaces to one space and the other space of the hydraulic actuator,
And a second actuator communicating passage formed separately from the first actuator communicating passage and the second actuator communicating passage and communicating with the first operating space and the second actuating space, respectively, for connecting to one pumping line and the other pumping line of the bidirectional hydraulic pump, A body block including a first pumping passage and a second pumping passage;
A push bar installed to pass through the first operation space and the second operation space;
The first operating space and the second operating space, wherein the first operating space and the second operating space are coupled to each other by the first operating space and the second operating space, respectively, An opening and closing device and a second opening and closing device; And
And a second actuator communicating passage provided between the first actuator connecting passage and the first actuating space and between the second actuating actuator connecting passage and the second actuating space, The first actuator is connected to the first actuator and the second actuating device is connected to the first actuating device and the second actuating device, A first check valve and a second check valve capable of being forcibly opened when they are moved,
The first check valve and the second check valve form a state in which the flow path is blocked without interference of the push bar in a state where the hydraulic pressure by the bidirectional hydraulic pump is removed from the first operating space and the second operating space ,
Wherein the first actuator connecting passage and the first pumping passage are formed with a passage through which the working oil can flow with each other by connecting the first working spaces to each other, And the hydraulic operating auxiliary valve is formed by connecting the second operating spaces to each other, 9. The method of claim 8,
The first opening / closing device and the second opening /
When the hydraulic pressure difference is generated between the first operating space and the second operating space, the push bar is moved toward the lower one of the first operating space and the second operating space, and the first check valve and the second check valve And the hydraulic control valve is forcibly opened by pushing the check valve provided on the lower side of the hydraulic pressure, 10. The method of claim 9,
Wherein the first opening and closing device and the second opening and closing device are installed on both sides in symmetry with each other,
Wherein the push bar includes a first push bar coupled with the first opening and closing device and a second push bar coupled with the second opening and closing device,
The first push bar and the second push bar are arranged so as to be aligned in a row so that their inner ends opposed to each other come into contact with each other,
The first opening and closing device
A first cylinder-shaped member installed in the first operating space and having a cylinder space disposed in a direction toward the second opening / closing device;
Closing the flow passage connecting the compensation passage and the first operating space by back and forth movement in a direction from the cylinder space of the first cylinder member toward the second opening and closing device, A first sliding space having a diameter larger than that of the first push bar insertion hole is formed in the interior of the first push bar insertion hole and communicated with the first push bar insertion hole, (2) a first opening and closing operation member that receives an elastic force to move in a direction toward the opening /
And a first piston block located in the first sliding space and performing piston movement in a direction toward the second opening / closing device,
The second opening and closing device
A second cylinder-shaped member installed in the second operating space and having a cylinder space disposed in a direction toward the first opening / closing device;
And a second flow path connecting the compensation flow path and the second operation space by opening and closing a flow path connecting the compensation flow path and the second operation space in a direction from the cylinder space of the second cylindrical member toward the first opening and closing device, A second sliding space having a diameter larger than that of the second push bar insertion hole is formed in the interior of the second push bar insertion hole and communicated with the second push bar insertion hole, A second opening and closing operation member that receives an elastic force to move in a direction toward the one opening and closing apparatus,
And a second piston block located in the second sliding space and performing a piston movement in a direction toward the first opening / closing device,
The first push bar and the second push bar are respectively fixed to the first piston block and the second piston block,
Wherein the first push bar and the second push bar comprise:
A first engaging head and a second engaging head which are respectively installed at the front end of the first opening and closing operation member and the second opening and closing operation member and which are respectively engaged with the first opening and closing operation member and the second opening and closing operation member, A hydraulic actuating auxiliary valve

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