KR101830361B1 - Apparatus for maintaining hydraulic pressure and hydraulic apparatus comprising the same - Google Patents

Abstract

The present invention relates to an apparatus to maintain a hydraulic pressure and a hydraulic apparatus comprising the same. According to the present invention, the apparatus to maintain a hydraulic pressure, which keeps the pressure of a hydraulic fluid on a hydraulic actuator or a hydraulic duct in a hydraulic system, which comprises: the hydraulic actuator driven by the hydraulic fluid from a first status, which is one of elongation and shrinkage, into a second status, which is another status than the first status among the elongation and shrinkage, and from the second status into the first status; a pump to supply the hydraulic fluid; and the hydraulic duct to allow the hydraulic fluid to flow from the pump to the hydraulic actuator, may comprise: a main frame unit into which the hydraulic fluid is introduced from a branch duct, which is branched from the hydraulic duct, and into which air is introduced from an air compressor through a pneumatic duct; a hydraulic fluid storage space to classify the hydraulic fluid and air introduced into the main frame unit and to store the hydraulic fluid on the main frame; and a moving unit to regulate an air storage space to store air on the main frame and to change on the main frame in accordance with the pressure of the hydraulic fluid and pressure of the air on the main frame for keeping the hydraulic fluid pressure on the hydraulic actuator or the hydraulic duct. The present invention provides the apparatus to maintain hydraulic pressure and the hydraulic apparatus comprising the same, which is able to keep a hydraulic pressure supplied to the hydraulic actuator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic pressure maintaining apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic pressure holding device, and more particularly, to a hydraulic pressure holding device that maintains hydraulic pressure on a hydraulic system including a hydraulic actuator, a pump, and a hydraulic pressure line which are extended and contracted by hydraulic oil.

In general, hydraulic actuators are used in factory equipment, construction machinery, and so on.

The hydraulic actuator can be driven by the pressure of the operating oil supplied from the pump.

For example, the hydraulic actuator can be used as a component of a jig.

The jig may refer to a special tool that attaches the workpiece or is attached to the workpiece to position the workpiece and guide the workpiece at the same time.

The jig may receive the hydraulic oil from the pump and restrict the movement of the workpiece by grasping the workpiece by the pressure of the hydraulic oil. Alternatively, the jig may be released from the workpiece by releasing the grip of the workpiece.

For example, the workpiece can be cut, machined, and the like by a machining facility while the jig grasps the workpiece to limit the movement of the workpiece.

Here, when the hydraulic fluid supplied to the hydraulic actuator is leaked, the hydraulic actuator can reduce the force of grasping the workpiece, failing to firmly grasp the workpiece, resulting in a defect in the workpiece or a worker's injury.

In order to solve such a problem, there is a method in which the pump is continuously operated to constantly supply a predetermined hydraulic pressure to the hydraulic actuator.

However, when the pump is continuously operated, a problem of high energy loss occurs.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic pressure holding device capable of maintaining a hydraulic pressure supplied to a hydraulic actuator and a hydraulic device including the hydraulic pressure holding device.

It is to be understood that the present invention is not limited to the above-described embodiments and that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the following claims .

According to the hydraulic holding device according to the embodiment of the present invention, the first state - the first state is either the state of extension or contraction by the operating oil - the second state - the second state is the state of extension or contraction And a hydraulic actuator that is driven from the second state to the first state, wherein the hydraulic system further comprises a pump for supplying operating fluid in addition to the hydraulic actuator, Wherein the operating fluid flows from the branch pipe branching from the hydraulic pressure pipe to the pneumatic pressure pipe through the air compressor, A main body through which air flows; And an air storage space in which air is stored on the main body portion and an operating oil storage space in which the operating oil is stored on the main body portion by separating the operating oil and air flowing into the main body portion, And a moving part changing on the main body part according to the pressure of the working oil on the main body part and the pressure of the air to maintain the pressure of the main body part.

According to the hydraulic pressure maintaining apparatus and the hydraulic pressure apparatus including the same according to the embodiment of the present invention, energy loss can be minimized and the hydraulic pressure supplied to the hydraulic actuator can be maintained.

The effects of the present invention are not limited to the above-mentioned effects, and the effects not mentioned can be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 is a schematic view showing an example of a hydraulic system including a hydraulic actuator;
FIGS. 2 to 4 are schematic views showing the operation of the hydraulic pressure holding device according to an embodiment of the present invention; FIG.
5 is a schematic block diagram of a hydraulic holding device according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

According to an aspect of the present invention, there is provided a hydraulic pressure holding apparatus comprising: a first state in which the first state is a state in which the first state is one of extension or contraction; a second state in the second state; 1 < / RTI > state and a hydraulic actuator that is driven from the second state to the first state, wherein the hydraulic system further comprises a pump for supplying hydraulic fluid in addition to the hydraulic actuator and a pump for supplying hydraulic fluid from the pump to the hydraulic actuator Wherein the operating fluid is supplied from a branch pipe branching from the hydraulic pressure pipe and is supplied from an air compressor through a pneumatic pipe to the hydraulic actuator, A main body portion into which air flows; And an air storage space in which air is stored on the main body portion and an operating oil storage space in which the operating oil is stored on the main body portion by separating the operating oil and air flowing into the main body portion, And a moving part changing on the main body part according to the pressure of the working oil on the main body part and the pressure of the air to maintain the pressure of the main body part.

In addition, the moving unit may increase the first change state in which the working oil storage space becomes smaller and the air storage space becomes larger, and the working oil storage space becomes larger according to the pressure of the working oil on the working oil storage space and the pressure of air on the air storage space, And a second change state in which the air storage space is reduced. The main body portion continuously receives air from the air compressor to maintain the pressure of the hydraulic fluid on the hydraulic actuator or the hydraulic pressure pipe in the first change state, Even if the storage space is enlarged, the pressure of the air on the air storage space may not be reduced.

The hydraulic pressure maintaining apparatus may further include an inflow control unit disposed on the pneumatic conduit to regulate the pressure of the air flowing into the air storage space from the air compressor.

The hydraulic pressure maintaining apparatus may further include an air conditioning unit disposed on the pneumatic conduit to discharge at least a part of the air on the air storage space to the outside in the second change state.

In addition, the air conditioner may block air moving from the air compressor toward the air storage space in the second change state.

The hydraulic pressure maintaining apparatus may further include an exhaust gas control unit disposed on the pneumatic conduit to regulate the pressure of air moving from the air storage space toward the air compressor in the second change state.

The hydraulic pressure maintaining apparatus may further include a controller for controlling whether the pump is operated based on the pressure of the operating fluid on the working fluid storage space and the pressure of the air on the air storage space.

The control unit may control whether the pump is operated based on the position of the moving unit moved in accordance with the pressure of the operating oil on the working oil storage space and the pressure of the air on the air storage space.

The hydraulic pressure holding device may further include a sensing unit sensing a position of the moving unit, and the control unit may control whether the pump is operated based on sensing of the sensing unit.

The control unit controls the pump so that the pump is operated when the moving unit is moved and the operating oil storage space changes to a predetermined size or less, and when the moving unit is moved so that the air storage space is less than a predetermined size The pump can be controlled so as to stop the operation of the pump.

The hydraulic pressure maintaining apparatus may further include an air adjusting unit disposed on the air pressure pipe and selectively limiting movement of air supplied from the air compressor to the air storage space, The controller may control the air conditioning unit to restrict the movement of the air when the pump is controlled so that the pump is operated.

When the pump is controlled to stop the operation of the pump by changing the air storage space to a predetermined size or less, the control unit may control the air conditioning unit so as not to restrict the movement of the air. have.

The control unit controls whether the pump is operated based on the pressure of the hydraulic oil on the hydraulic oil storage space and the pressure of the air on the hydraulic oil storage space on the hydraulic oil storage space when the hydraulic actuator is in the first state, In the second state, it is possible not to control the operation of the pump based on the pressure of the working oil on the working oil storage space and the pressure of the air on the air storage space.

The moving unit may have an area of a surface to which the pressure of the air on the air storage space is transferred, which is larger than an area of the surface of the operating oil storage space where the pressure of the operating oil is transmitted.

According to another aspect of the present invention, there is provided a hydraulic device comprising: the hydraulic pressure maintaining device; A hydraulic system including a hydraulic actuator driven by operating oil, a pump for supplying operating oil, and a hydraulic pressure line for allowing hydraulic fluid to flow from the pump to the hydraulic actuator; And an air compressor for introducing air into the hydraulic pressure holding device.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

FIG. 1 is a schematic view showing an example of a hydraulic system including a hydraulic actuator, and FIGS. 2 to 4 are schematic views showing the operation of a hydraulic holding device according to an embodiment of the present invention.

5 is a schematic block diagram of a hydraulic pressure maintaining apparatus according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

First, the hydraulic system 20 will be described with reference to Fig.

The hydraulic system (20) includes a hydraulic actuator (21) driven by hydraulic oil from a first state to a second state and from the second state to the first state, a pump (P) (22) for allowing hydraulic fluid to flow from the hydraulic actuator (21) to the hydraulic actuator (21).

For example, the hydraulic actuator 21 may be a hydraulic cylinder, and the piston may be stretched or contracted on the cylinder depending on the hydraulic pressure of the hydraulic oil.

The first state and the second state may mean that the hydraulic actuator 21 is driven by operating oil to change the state.

For example, the first state may mean either the state in which the piston of the hydraulic actuator 21 is stretched or the state in which the piston contracts.

For example, the second state may refer to a state different from the first state of the state in which the piston of the hydraulic actuator 21 extends or contracts.

That is, if the first state means a contracted state, the second state means an elongated state, and if the first state indicates an elongated state, the second state means a contracted state.

Here, for example, the hydraulic actuator 21 may be a jig having a jaw, and when the hydraulic actuator 21 is in the first state, the hydraulic actuator 21 may grip or clamp the workpiece so as to limit movement of the workpiece Quot; state ", and may mean a state in which, when the hydraulic actuator 21 is in the second state, the jaws are released from tightening the work.

Of course, in the first state, the first state is a state in which the workpiece is not clamped, and in the second state, the first state is a state in which the workpiece is clamped. However, State, and the second state is a state in which the workpiece is unclamped.

The hydraulic system (20) is arranged on the hydraulic line (22) to allow the hydraulic actuator (21) to be driven from the first state to the second state and from the second state to the first state 23).

In one example, the valve 23 may be a solenoid valve.

For example, when the valve 23 is in the first valve position 23a, the valve 23 may supply the hydraulic fluid to the entire chamber of the hydraulic actuator 21 and allow the hydraulic fluid stored in the rear chamber to be discharged to the tank.

As a result, when the valve 23 is at the first valve position 23a, the hydraulic actuator 21 can maintain the first state.

Conversely, in the case of the second valve position 23b, the valve 23 allows the hydraulic oil stored in the front chamber of the hydraulic actuator 21 to be discharged to the tank and supply the hydraulic oil to the rear chamber.

As a result, when the valve 23 is the second valve position 23b, the hydraulic actuator 21 can maintain the second state.

Here, the hydraulic system 20 may further include a check valve 24 disposed on the hydraulic pressure line 22 and allowing flow of the hydraulic fluid only from the pump P toward the valve 23 .

The hydraulic system 20 can be used in factory facilities, construction machines, and the like.

For example, when the hydraulic system 20 is used as a jig for machining a workpiece, the hydraulic actuator 21 must maintain the first state of tightly grasping or tightening the workpiece during the machining operation of the workpiece.

However, leakage and loss of operating oil may occur on the connection portion between the components constituting the hydraulic system 20, the hydraulic pipeline 22 or the hydraulic actuator 21. [

The pressure of the operating fluid that maintains the first state is lowered. As a result, the hydraulic actuator 21 may fail to securely hold the workpiece.

To solve this problem, the pump P may be continuously operated to maintain the first state, but the continuous operation of the pump P causes a lot of energy loss.

Hereinafter, a hydraulic holding device capable of solving such a problem will be described in more detail with reference to Figs. 2 to 5. Fig.

The hydraulic pressure holding device may be a device for maintaining the pressure of the hydraulic fluid on the hydraulic actuator 21 or the hydraulic pressure line 22. [

For example, the hydraulic pressure holding device may include a main body 100 (see FIG. 1) in which operating oil flows from a branch pipe L1 branching from the hydraulic pressure pipe 22 and air flows from the air compressor A through a pneumatic pipe L2, ).

For example, the branch passage L1 may be a conduit for guiding the hydraulic fluid supplied from the pump P to the hydraulic actuator 21 to be transferred to the main body 100.

For example, the branch pipe L1 may be branched from the hydraulic pipe 22, but may be connected to the hydraulic actuator 21 so that the hydraulic oil on the hydraulic actuator 21 may flow into the main body 100 To be moved.

For example, the air compressor A may be configured to introduce air having a predetermined pressure into the main body 100.

For example, the air compressor (A) may be an air compressor.

For example, the main body 100 may be supplied with operating fluid from the branch pipe L1, and air may be introduced from the air compressor A.

The hydraulic pressure holding device includes a working oil storage space S1 in which the working oil is stored on the main body 100 by separating the working oil flowing into the main body 100 from the air, And a moving unit 200 for defining an air storage space S2 in which the air is stored.

For example, a sealing member may be disposed between the moving part 200 and the main body part 100 to prevent leakage of operating oil on the working oil storage space S1 and air leakage on the air storage space S2. have.

For example, the moving unit 200 is configured to move the operating fluid on the main body 100 to maintain the pressure of the operating fluid on the hydraulic actuator 21 or the hydraulic pressure pipe 22 in the first state of the hydraulic actuator 21. [ And may be changed on the main body 100 according to the pressure of the air and the pressure of the air.

More specifically, when the pump P is stopped in the first state and the amount of the hydraulic fluid on the hydraulic system 20 is reduced by the loss of hydraulic oil, the pressure of the hydraulic fluid on the main body 100 is The problem may be lowered.

In order to compensate for the lowering of the pressure of the working oil on the main body 100, the moving part 200 is operated by the balance of the force of the working oil on the main body 100 and the pressure of the air, 100).

For example, the moving unit 200 may reduce the working oil storage space S1 according to the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2, The first change state in which the operating oil storage space S2 becomes large and the second change state in which the working oil storage space S1 becomes large and the air storage space S2 becomes small.

More specifically, when the amount of hydraulic fluid leaking from the hydraulic system 20 is reduced at the position of the moving part 200 shown in FIG. 2, the moving part 200 moves in the working oil storage space S1, I.e., the first change state, by the balance of the force according to the pressure of the working oil on the air storage space S2 and the pressure of the air on the air storage space S2 .

Conversely, when the pump P is operated at the position of the moving part 200 shown in FIG. 3 to supply the hydraulic oil to the hydraulic pressure line 22, the moving part 200 moves in the hydraulic oil storage space S1, I.e., the second changing state, by the balance of the force according to the pressure of the working oil on the air storage space S2 and the pressure of the air on the air storage space S2.

Here, the main body 100 continuously receives air from the air compressor A to maintain the pressure of the hydraulic fluid on the hydraulic actuator 21 or the hydraulic pressure pipe 22 in the first change state, The pressure of air on the air storage space S2 may not be reduced even if the storage space S2 is large.

More specifically, the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2 are equalized to each other, and the working oil on the hydraulic system 20 is leaked, When the pressure of the working oil on the working oil storage space S1 is lowered, the moving part 200 moves from the air storage space S2 toward the working oil storage space S1, 1 change state.

Here, the main body 100 continuously receives air from the air compressor A through the pneumatic pipeline L2. Even if the air storage space S2 is enlarged due to the first change state, The pressure of the air on the space S2 can be kept constant at a predetermined pressure without being reduced.

The pressure of the working oil on the working oil storage space S1 is not lowered without further operation of the pump P due to the first change state of the moving part 200, So that the pressure of the hydraulic fluid on the hydraulic system 20 can be kept constant at a predetermined pressure.

The hydraulic pressure maintaining apparatus according to an embodiment of the present invention includes an inlet regulator (not shown) disposed on the pneumatic conduit L2 for regulating the pressure of air introduced from the air compressor A into the air storage space S2 300).

For example, the inflow control unit 300 may be a regulator and may control the pressure of air on the air storage space S2.

For example, the inflow control unit 300 controls the pressure of the air flowing into the air storage space S2 from the air compressor A in the first change state, Pressure can be adjusted.

The user can operate the inflow control unit 300 to set the pressure of air on the air storage space S2 to various values. As a result, the pressure of the air on the air storage space S2 can be variously adjusted have.

In addition, the hydraulic pressure maintaining apparatus according to an embodiment of the present invention may be arranged on the air pressure pipeline L2 so as to control at least one of air conditioning (400). ≪ / RTI >

In addition, the air conditioning unit 400 may block air moving in the direction of the air storage space S2 from the air compressor A in the second change state.

More specifically, the pump P is operated in a state where the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2 are in equilibrium, The pressure of the working oil on the working oil storage space S1 is increased and the moving part 200 moves the pressure of the working oil on the working oil storage space S1 and the pressure of the working oil on the air storage space S2 The second change state can be realized by the pressure.

Here, due to the second change state, the pressure of the air on the air storage space S2 may be abnormally high, which may cause the air compressor A to fail.

In order to solve this problem, the air conditioning unit 400 discharges at least a part of the air on the air storage space S2 to the outside in the second change state, so that the pressure of the air on the air storage space S2 becomes non- And further prevents the air moving from the air compressor (A) to the air storage space (S2) from being blocked in the second change state so that the pressure of the air on the air storage space (S2) .

For example, the air conditioning unit 400 may be a solenoid valve.

For example, the air conditioning unit 400 may be located at a first position 400a that allows air to flow from the air compressor A to the air storage space S2 in the first change state, (S2) from the air compressor (A) to the air storage space (S2) while discharging at least a part of the air on the air storage space (S2) (Not shown) to the air compressor (A).

The hydraulic pressure maintaining apparatus according to an embodiment of the present invention may further include a pressure control valve (not shown) disposed on the pneumatic pressure conduit L2 for moving air from the air storage space S2 toward the air compressor A And a discharge control unit 500 for controlling the pressure.

For example, the discharge control unit 500 may be a regulator or a speed control, and may control the pressure of air on the air storage space S2.

For example, the discharge control unit 500 may control the discharge control unit 500 to discharge the air from the air storage space S2 for a pressure equal to or higher than a predetermined pressure such that the pressure of air on the air storage space S2 is constant at a predetermined pressure The air can be moved in the direction of the air compressor (A).

Accordingly, it is possible to adjust the pressure of the air on the air storage space S2 in the second change state by controlling the pressure of the air moving from the air storage space S2 toward the air compressor A.

The user can set the pressure of the air on the air storage space S2 to various values by operating the discharge control unit 500. As a result, the pressure of the air on the air storage space S2 can be variously adjusted have.

When the pressure of the air on the air storage space S2 becomes higher in the second change state, the discharge control unit 500 controls the air pressure in the air storage space S2, The air that has passed through the discharge control unit 500 is allowed to flow from the air storage space S2 to the air compressor A in the second position 400b, And can be discharged to the outside through the regulating unit 400.

As a result, even in the second change state, the pressure of the air on the air storage space S2 can be kept constant at a predetermined pressure, and the pressure of the working oil on the working oil storage space S1 is also constant Can be maintained.

Hereinafter, the operating state of the hydraulic pressure holding device will be described in more detail with reference to FIG. 2 to FIG.

The inflow adjusting unit 300 adjusts the pressure of the air flowing into the air storage space S2 from the air compressor A so that the pressure of the air on the air storage space S2 becomes 10 MPa .

The discharge control unit 500 regulates the pressure of the air moving from the air storage space S2 toward the air compressor A so that the pressure of air on the air storage space S2 is maintained at 10 MPa I suppose.

For example, the hydraulic actuator 21 shown in Figs. 2 to 4 may be in a state holding the workpiece as the first state.

In Fig. 2, when the hydraulic actuator 21 grips the workpiece, the pump P may be in a stopped state for further energy saving.

Here, the moving part 200 can pressurize the working oil in the working oil storage space S1 by the pressure of the air continuously flowing from the air compressor A into the air storage space S2.

For example, the moving unit 200 can be moved on the main body 100 according to the balance of the force due to the pressure of the air on the air storage space S2 and the pressure on the working oil storage space S1.

For example, the moving part 200 may have an area of a surface to receive the pressure of the air on the air storage space S2 and an area of a surface to receive the pressure of the working oil on the working oil storage space S1.

For example, the moving part 200 may have an area of a surface receiving the pressure of air on the air storage space S2 larger than an area of a surface of the working oil storage space S1 on which the pressure of the operating oil is transmitted.

As a result, even if the pressure of the air on the air storage space S2 is relatively smaller than the pressure of the working oil on the working oil storage space S1, As shown in FIG.

That is, it is possible to maintain the pressure of the operating oil on the working oil storage space S1 by inducing the balance of the force only by the pressure of air on the air storage space S2, which is smaller than the pressure of the working oil on the working oil storage space S1.

Here, when leakage of the operating oil occurs on the hydraulic system 20, the pressure of the operating oil in the working oil storage space S1 may be lowered, and the moving unit 200 may be in the first change state Lt; / RTI >

FIG. 3 shows that the moving unit 200 shown in FIG. 2 is changed to the first changing state.

The main body 100 continuously receives air having a predetermined pressure from the air compressor A into the air storage space S2 so that the pressure of the working fluid in the working fluid storage space S1 The pressure of the working oil on the working oil storage space S1 can be kept constant by the movement of the moving part 200, which becomes smaller.

The pressure holding device further includes a control unit 900 for controlling whether the pump P is operated based on the pressure of the working oil on the working oil storage space S1 and the pressure of air on the air storage space S2 .

The control unit 900 controls the operation of the pump 200 based on the position of the moving unit 200 that is moved in accordance with the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2. P can be controlled.

The pressure holding device may further include a sensing unit 600 sensing the position of the moving unit 200.

For example, the sensing unit 600 may sense the position of the moving unit 200 moved on the main body 100.

For example, the sensing unit 600 includes an interlocking part 610 connected to the moving part 200 and extended to the outside of the body part 100 to move in conjunction with movement of the moving part 200, And sensing units 620 and 630 for sensing the position of the interlocking unit 610.

Here, for example, the moving unit 200 may form an interlocking part arrangement space S3 which is distinguished from the working oil storage space S1 and the air storage space S2.

The interlocking part 610 can be moved in conjunction with the movement of the moving part 200 in the space of the interlocking part arrangement space S3 and can be moved along with the working oil storage space S1 and the air storage space S2, It is not directly influenced by the pressure of the working oil and the air due to being disposed on the separate interlocking part arrangement space S3.

For example, the sensing units 620 and 630 sense the interlocking unit 610 that moves in conjunction with the moving unit 200 in the first change state and detects that the working oil storage space S1 becomes smaller And a second sensing unit 620 sensing the interlocking unit 610 moving in conjunction with the moving unit 200 in the second change state to sense a decrease in the air storage space S2, And a sensing unit 630.

For example, the sensing units 620 and 630 may be optical sensors, but the present invention is not limited thereto. The sensing units 620 and 630 may be limiter switches in contact with the interlocking unit 610. Further, The present invention can be modified in various ways as long as it is capable of directly or indirectly detecting the position of the display device.

For example, the controller 900 may control whether the pump P is operated based on the sensing of the sensing unit 600.

3, when the moving part 200 is moved due to the first change state and the working oil storage space S1 is changed to a predetermined size or less, The control unit 900 may sense the position of the moving unit 200 and the control unit 900 may control the driving unit 600 based on the sensing of the sensing unit 600 so that the working oil storage space S1 is no longer small, (P) can be operated.

When the controller (P) operates the pump (P), the operating fluid may flow into the working oil storage space (S1).

When the operating oil flows into the working oil storage space S1, the working oil pressure on the working oil storage space S1 can be increased.

As a result, the moving part 200 can be changed to the second changing state in which the working oil storage space S1 is increased and the air storage space S2 is decreased.

Here, as the air storage space S2 becomes smaller, the pressure of air in the air storage space S2, which has been maintained at 10 MPa, can be increased.

However, the discharge control unit 500 is configured to discharge the air from the air storage space S2 to the air storage space S2 for a pressure exceeding 10 MPa so that the pressure of the air on the air storage space S2 in the second change state is maintained at 10 MPa. (A) direction.

As a result, the pressure of air on the air storage space S2 can be maintained at 10 MPa even in the second change state.

Therefore, even if the operating oil is introduced into the working oil storage space S1 by the operation of the pump P, the pressure of the working oil on the working oil storage space S1 can be kept constant at a predetermined pressure.

The pressure discharged from the discharge control unit 500 may be discharged to the outside without being moved to the air compressor A through the air conditioning unit 400 located at the second position 400b.

When the control unit 900 controls the pump P so that the operating oil storage space S1 is changed to a predetermined size or less and the pump P is activated, that is, when the pump P is changed to the second change state, The air conditioning unit 400 may control the air conditioning unit 400 to limit the movement of the air.

That is, when the control unit 900 changes from the first change state to the second change state, the controller 900 controls the air control unit 400 to change from the first position 400a to the second position 400b can do.

As a result, the air conditioning unit 400 can selectively restrict the movement of air supplied from the air compressor A to the air storage space S2 under the control of the controller 900. [

Here, the moving part 200 is moved by the operation of the pump P and can be located at the position shown in FIG.

In order to prevent the air storage space S2 from becoming smaller when the moving unit 200 is moved and the air storage space S2 is changed to a predetermined size or less, The pump P can be controlled so that the pump P is stopped.

When the controller P controls the pump P to stop the pump P by changing the air storage space S2 to a predetermined size or less, the controller 900 controls the air- The air conditioning unit 400 may be controlled so as not to limit the movement of the air.

The control unit 900 senses the position of the moving unit 200 through the sensing unit 600 and determines that the air storage space S2 is changed to a predetermined size or less. The pump P is controlled to stop the operation of the pump P while controlling the air conditioning unit 400 to return to the first position 400a from the second position 400b, can do.

As a result, the air generated from the air compressor A can be introduced into the air storage space S2 again, and the air pressure in the air storage space S2 can be maintained at 10 Mpa.

When the moving part 200 moves to the position of FIG. 3 again by leakage of the operating oil at the position of FIG. 4, the control part 900 operates the pump P again, The control unit 900 again stops the operation of the pump P, and such a cycle can be continuously repeated.

When the hydraulic actuator 21 is in the first state, that is, when gripping a workpiece, the control unit 900 controls the pressure of the working oil on the working oil storage space S1, The control unit 900 can control whether the pump P is operated based on the pressure of the air on the hydraulic motor S2 when the hydraulic actuator 21 is in the second state, It is possible not to control the operation of the pump P based on the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2.

This is because it is not necessary to maintain the pressure of the hydraulic fluid in the working oil storage space S1 constant in a state where the hydraulic actuator 21 does not grip the workpiece.

Therefore, when the hydraulic actuator 21 is in the second state, the controller 900 controls the pump (not shown) based on the pressure of the working oil on the working oil storage space S1 and the pressure of the air on the air storage space S2, P) is not controlled so that energy saving can be realized.

5 is a block diagram of components constituting the present invention. The control unit 900 may control at least one of the pump P, the valve 23, and the air conditioning unit 400.

That is, the control unit 900 can control whether the pump P is operated or not, and the valve 23 is positioned at any one of the first valve position 23a and the second valve position 23b And the air conditioning unit 400 may be controlled to be positioned at any one of the first position 400a and the second position 400b.

Furthermore, the control unit 900 may also control the inflow control unit 300 and the discharge control unit 500 to control the air pressure.

The control unit 900 may receive data necessary for operating the hydraulic pressure maintenance apparatus through the input unit 700 and may display data related to the operation of the hydraulic pressure maintenance apparatus through the display 800. [

For example, the control unit 900 is an electronic circuit that processes and computes various electronic signals. The control unit 900 receives information or signals regarding the position of the moving unit 200 from the sensing unit 600, Data can be calculated and processed, and other configurations of the hydraulic pressure holding device can be controlled with an electronic signal.

Also, the controller 900 does not necessarily have to be implemented as a single object.

The controller 900 may be implemented as a plurality of controllers 900 that can communicate with each other.

For example, the control unit 900 may be partly installed in the hydraulic system 20 and some of the control unit 900 may be distributed to the hydraulic pressure maintaining apparatus. The distributed control unit 900 may perform wireless / wired communication And perform the functions by collaborating with them.

For example, when a plurality of control units 900 are distributed and arranged, a part of the control units 900 may simply transmit signals or information in a slave type, while others may receive various signals or information in a master type, Control may be performed.

The hydraulic device according to another embodiment of the present invention may include the hydraulic system 20 and the hydraulic holding device.

Furthermore, the hydraulic device may further include the air compressor (A).

The hydraulic pressure holding device may be used not only to maintain the hydraulic pressure of the hydraulic system described above but also to maintain the hydraulic pressure of the hydraulic device, the hydraulic equipment, and the like, not the hydraulic pressure system.

In addition, although it has been described that the pressure of the air is used to maintain the hydraulic pressure, the present invention is not limited thereto, and hydraulic pressure may be used.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that changes or modifications may fall within the scope of the appended claims.

P: Pump
20: Hydraulic system
100:
200:

Claims (15)

The second state being a state different from the first state during elongation or contraction; and a second state in which the second state is different from the first state during stretching or contraction, Wherein the hydraulic system further includes a pump for supplying operating fluid to the hydraulic actuator in addition to the hydraulic actuator and a hydraulic pressure line for allowing hydraulic fluid to flow from the pump to the hydraulic actuator, The hydraulic pressure holding device for holding the pressure of the hydraulic fluid on the hydraulic actuator or the hydraulic pressure line in the housing,
A main body portion through which hydraulic oil flows from a branch pipe branching from the hydraulic pressure pipe into the air compressor through a pneumatic pipe;
An operating oil storage space in which the operating oil is stored on the main body portion by separating the operating oil and air flowing into the main body portion, and an air storage space in which air is stored on the main body portion; A moving part changing on the main body part according to the pressure of the working oil on the main body part and the pressure of the air to maintain the pressure; And
And a control unit for controlling the operation of the pump for supplying the hydraulic fluid to the hydraulic actuator based on the pressure of the hydraulic oil on the hydraulic oil storage space and the pressure of the air on the air storage space,
The moving unit includes:
And a control unit that controls the operation of the compressor according to the pressure of the operating oil on the working oil storage space and the pressure of the air on the air storage space,
A first change state in which the working oil storage space is reduced and the air storage space is increased, and a second change state in which the working oil storage space is increased and the air storage space is decreased,
Wherein,
Wherein the pump is operated to control the pump so that the pump is operated from the first change state to the second change state when the movement portion is changed and the operating oil storage space is changed to a predetermined size or less, The control unit controls the pump to stop the operation of the pump when the moving unit is changed and the air storage space is changed to a predetermined size or less,
An air regulator disposed on the pneumatic conduit to discharge at least a part of the air on the air storage space to the outside in the second change state; And
And a discharge control unit disposed on the pneumatic conduit to regulate the pressure of air moving from the air storage space to the outside in the second change state,
Wherein the pressure of the hydraulic fluid on the hydraulic actuator or the hydraulic pressure pipe in the second change state,
A control unit for controlling the pump so as to allow hydraulic oil to flow from the branch pipe into the working oil storage space,
Hydraulic holding device.
The method according to claim 1,
Wherein,
Wherein the pressure of the air on the air storage space is not reduced even if the air storage space is continuously inflowed from the air compressor to maintain the pressure of the hydraulic oil on the hydraulic actuator or the hydraulic pressure line in the first change state,
Hydraulic holding device.
3. The method of claim 2,
And an inflow control unit disposed on the pneumatic conduit to regulate the pressure of air introduced into the air storage space from the air compressor,
Hydraulic holding device.
delete 3. The method of claim 2,
The air-
And a second change-over state in which air flowing from the air compressor toward the air storage space is blocked,
Hydraulic holding device.
delete delete The method according to claim 1,
Wherein,
And controls the operation of the pump based on the position of the moving part moved in accordance with the pressure of the operating oil on the working oil storage space and the pressure of the air on the air storage space.
Hydraulic holding device.
9. The method of claim 8,
And a sensing unit for sensing a position of the moving unit,
Wherein,
And a control unit for controlling the operation of the pump based on sensing of the sensing unit,
Hydraulic holding device.
delete The method according to claim 1,
Wherein,
When the pump is controlled so that the working oil storage space is changed to a predetermined size or less and the pump is operated,
Wherein the air conditioner controls the air conditioner to restrict movement of the air,
Hydraulic holding device.
12. The method of claim 11,
Wherein,
When the pump is controlled so that the air storage space is changed to a predetermined size or less to stop the operation of the pump,
Wherein the air conditioner controls the air conditioner so as not to restrict the movement of the air,
Hydraulic holding device.
The method according to claim 1,
Wherein,
Controls the operation of the pump based on the pressure of the working oil on the working oil storage space and the pressure of the air on the air storage space when the hydraulic actuator is in the first state,
Wherein the controller controls the operation of the pump based on the pressure of the hydraulic fluid on the hydraulic oil storage space and the pressure of the air on the air storage space when the hydraulic actuator is in the second state,
Hydraulic holding device.
The method according to claim 1,
The moving unit includes:
Wherein an area of a surface of the air storage space receiving the pressure of the air is larger than an area of a surface of the pressure receiving space of the working oil storage space,
Hydraulic holding device
A hydraulic pressure holding device according to claim 1;
A hydraulic system including a hydraulic actuator driven by operating oil, a pump for supplying operating oil, and a hydraulic pressure line for allowing hydraulic fluid to flow from the pump to the hydraulic actuator; And
And an air compressor for introducing air into the hydraulic pressure holding device.
Hydraulic equipment.

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