KR20180071693A - reversing prevention Valve for construction vehicle possible common of relief valve - Google Patents

Abstract

With the present invention, single relief valve-based sharing can be carried out for relief valves for left turn and right turn, which are mounted to respectively control the maximum pressures of the left turn and the right turn by improving the structural type of a reversing prevention valve mounted to prevent reversing of an excavator upper body. The present invention provides a reversing prevention valve for a construction vehicle allowing relief valve sharing including a first chamber communicating with a left turn port between a valve mounting portion and a valve body, a second chamber communicating with a right turn port, a center chamber formed between the first and second chambers, and a common relief valve connected to the center chamber; and includes a first flow path connected to the center chamber in a form formed in the valve body and a first through hole connected to the first chamber; a second flow path connected to the center chamber and a second through hole connected to the second chamber; a first orifice unit formed in the first spool to allow or block communication between the first through hole and the first flow path in accordance with the movement position of the first spool; and a second orifice unit formed in the second spool to allow or block communication between the second through hole and the second flow path in accordance with the movement position of the second spool.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing prevention valve for a construction equipment,

The present invention relates to a reversing prevention valve for a construction equipment capable of sharing a relief valve, and more particularly, to a reversing prevention valve for a construction equipment, which improves the structure type of a reversing prevention valve mounted to prevent an inverting phenomenon of an upper portion of an excavator, The left-hand relief relief valve and the relief relief valve, which are mounted to control the respective pressures, can be used as one relief valve.

Generally, a construction machine such as an excavator and a crane is provided with an excavator upper body driven by hydraulic pressure. Such an excavator upper body is configured to perform a left turn, a priority turn, and a turn stop by the operation of the driver.

Generally, the turning of the upper body of the excavator is performed by driving the hydraulic swing motor, and the hydraulic swing motor is stopped by turning the hydraulic oil supplied from the hydraulic pump and cutting off the pressure oil.

On the other hand, when the excavator upper body is controlled to stop turning, the supply of the hydraulic oil is interrupted through the left-turn swing port or the priority swing port, and the hydraulic oil supply to the left- The excavator upper body is continuously turned by the inertia force. As a result, braking pressure is accumulated in the hydraulic swing motor in the opposite direction to the connection port due to continuous turning according to the inertia of the upper body of the excavator, and finally, the turning of the upper body of the excavator is stopped.

 When the upper body of the excavator stops rotating, the braking pressure of one of the connection ports is limited through the corresponding left-hand relief valve or the relief relief valve connected to the left connection relief valve or the relief relief valve. The upper body of the excavator is reversed in the direction opposite to the turning due to the braking pressure which is still accumulated in the hydraulic swivel motor although it goes out through the valve to the tank.

At this time, since the pressure formed inside the hydraulic swing motor is lower than the relief pressure, the hydraulic oil can not escape. As a result, the pressure of one of the high pressure, which has acted as a braking force, The reversal phenomenon occurs again due to the high pressure.

In order to prevent such an inversion phenomenon, when the high pressure of one side is lowered and the low pressure of the other side is elevated, the left-turn purpose port of the anti-reverse valve and the priority port are communicated with each other, Thereby preventing the reversion of the upper body.

In general, the relief valve is provided in a state in which the left-hand relief valve and the relief relief valve are connected to the reversal prevention valve, respectively, in order to respectively control the maximum pressure for the left and the right. As a result, the cost of each relief valve can be increased, and additional line installation and various valves (for example, a shuttle valve, a check valve) and connecting parts for controlling the flow rate together with the connection of the relief valve can be added The manufacturing cost is increased. In addition, the number of working hours is increased, so that the productivity can not be increased.

Korean Patent Publication No. 10-2016-0015630 Korean Patent Publication No. 10-2008-0045314 Korea public utility model room 1998-031865

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems of the prior art, and it is an object of the present invention to provide an anti-reverse valve for preventing an inverted phenomenon of an upper body of an excavator, And the relief valve for allowing the relief valve to be used as a single relief valve to be shared by the left line relief valve and the priority relief valve, Check valve) and an anti-reverse valve for a construction equipment that can be used without an accessory connection part.

According to an aspect of the present invention, there is provided an inversion preventing apparatus including a valve body fixed in a valve mounting portion, first and second spools arranged to be interlocked with each other while being accommodated in the valve body, A valve, comprising: a first chamber communicating with a left line-turning port between the valve mounting portion and a valve body; a second chamber communicating with the priority port; a center chamber formed between the first chamber and the second chamber; And a common relief valve connected to the common relief valve; A first flow path connected to the center chamber in a form formed on the valve body, and a first through hole connected to the first chamber; A second flow path connected to the center chamber, and a second through hole connected to the second chamber; A first orifice formed in the first spool so as to cut off communication between the first passage and the first passage according to the movement position of the first spool or to communicate with each other; A second orifice formed in the second spool to block or communicate communication between the second through hole and the second flow path according to the movement position of the second spool; The present invention can achieve the object through a reversing prevention valve for a construction equipment which is capable of sharing a relief valve formed by including a relief valve.

The first and second diaphragms may be formed in the valve mounting portion so as to define the first chamber, the second chamber, and the center chamber so as to be closely fixed to the valve body. A first flow path connected to the center chamber in a state of being formed in the valve body with the first partition wall therebetween, and a first through hole connected to the first chamber; A second passage connected to the center chamber in a state of being formed in the valve body with the second partition being interposed therebetween, and a second passage communicating with the second chamber, wherein the relief valve can be commonly used. The purpose can be achieved through the prevention valve.

In addition, the first and second orifice portions can achieve the object through a reversing prevention valve for a construction equipment which can commonly use a relief valve formed of the first and second orifice holes.

As described above, when the anti-reverse valve for construction equipment capable of sharing the relief valve according to the present invention is applied, the maximum pressure control of the left line and the maximum pressure control of the priority line can be realized as one relief valve, The additional line installation for controlling the flow rate together with the connection of one of the relief valves as well as the subsidiary adoption of various valves (for example, a shuttle valve, a check valve) and connecting parts are eliminated, It is possible to lower the work cost, and the work cost can be reduced, so that the productivity can be improved.

1 is a view showing a reversal prevention valve for a construction equipment capable of sharing a relief valve according to the present invention.
FIGS. 2A to 2D are views showing an anti-reverse valve for a construction equipment capable of sharing a relief valve according to the present invention. FIG. 2A shows an operation state of the upper body of the excavator during a turning operation. FIG. 2B shows the operating state of the upper body of the excavator during inertial rotation. FIG. FIG. 2c is a view showing an operating state when the high pressure, which serves as a hydraulic brake during the reverse rotation of the upper body of the excavator, is lowered and the pressure forming the low pressure is increased. FIG. 2D shows an operation state when the left line-turning port and the priority switching port of the reverse prevention valve are in communication with each other.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the anti-reverse valve 10 includes a valve mounting portion 12 formed in a hollow structure, a valve body 14 fixedly coupled to the valve mounting portion 12 to be received in the valve mounting portion 12, And first and second spools (16, 18) movably received in the valve body (14) and respectively disposed on both sides in a symmetrical structure abutting against each other.

Specifically, the first and second diaphragms 20 and 22 are spaced apart from each other along the longitudinal direction of the valve mounting part 12 and fixed to the outer surface of the valve body 14 And is formed along the inner circumferential surface.

A first chamber 24 communicating with the left-turn swinging port A of the valve mounting portion 12 and a second chamber 24 communicating with the left-turn swinging port A of the valve mounting portion 12 are provided between the valve mounting portion 12 and the valve body 14, And a center chamber 28 formed between the first chamber 24 and the second chamber 26. The center chamber 28 is divided into a first chamber 24 and a second chamber 26. The second chamber 26 communicates with the first chamber 24 and the second chamber 26, And is connected to communicate with the valve 30 through the line 32.

The valve body 14 is provided with a first flow path 34 connected to the center chamber 28 via the first partition 20 and a first through hole 36 connected to the first chamber 24, And the first passage 34 and the first passage 36 can communicate with each other through the first space portion 38 formed in the valve body 14. [

The first space portion 38 may be formed with the first space portion 38 or the first space portion 38 may be destroyed depending on the moving position of the first spool 16 accommodated in the valve body 14 The first spool 16 is formed with a first step portion P2 that can be engaged with the first step P1 of the valve body 14. [

The valve body 14 is provided with a second flow path 40 connected to the center chamber 28 via the second partition 22 and a second through hole 42 connected to the second chamber 26, Respectively. The second passage 40 and the second passage 42 are connected to communicate with each other through a second space 44 formed in the valve body 14.

The second space portion 44 is formed in accordance with the moving position of the second spool 18 coupled to the valve body 14 or the second space portion 44 disappears A second stepped portion P4 is formed in the second spool 18 so that the second stepped portion P4 can be engaged with the second stepped portion P3 of the valve body 14. [

As described above, the first and second spools 16 and 18 are movably accommodated in the valve body 14. The first and second orifices 46 and 48 are formed in the first and second stepped portions P1 and P2 of the first and second spools 16 and 18, respectively.

The first orifice hole 46 is formed in the first orifice hole 46 so that the first through hole, the first space portion 38 and the first flow path 34 can communicate with each other according to the position of the first spool 16. [ The second orifice second space portion 44 and the second flow path portion 40 are formed in the second orifice portion 48 such that the second orifice second space portion 44 and the second flow path portion 40 communicate with each other according to the position of the second spool 18. [ And an orifice hole 52.

Hereinafter, the operation of the anti-reverse valve 10 for a construction equipment capable of sharing a relief valve according to the present invention will be schematically described.

Prior to the explanation, in the construction machine such as the excavator and the crane, the hydraulic oil forming the high pressure is supplied to the corresponding port (for example, the left port A or the priority port B ).

For example, as shown in FIG. 2A, the hydraulic fluid that forms a high pressure through the first recirculating port B is supplied to the revolving motor drive portion M and the anti-reverse valve 10, respectively.

Here, when the high-pressure hydraulic oil (arrow) is supplied to the anti-reverse valve 10, the high-pressure hydraulic oil fills the second chamber 26.

The operating fluid supplied to the second chamber 26 flows into the center chamber 28 through the second through hole 42 and flows through the common relief valve 30 connected to the center chamber 28 through the line 32. [ So that the pressure is adjusted by the set pressure. At this time, the second orifice portion 48 of the second spool 18 advances together with the second spool 18, and the second chamber 26, the second through hole 42, the second flow path 40, So that the chamber 28 is in a communicating state.

The first spool 16 is moved backward to close the first passage 36 and the first passage 34 so that the operating fluid present in the center chamber 28 is discharged to the first chamber 24, It is in a state that it can not flow.

2B and 2C, when the swing stop signal of the control valve (not shown) is made to stop the upper body of the excavator (not shown) in the above state, All of the working oil supplied to the swing motor drive section M is shut off as well as the excavator upper body is continuously turned by the turning inertia.

As a result, the braking pressure for the hydraulic fluid acting in the opposite direction to the inertial direction of the upper body of the excavator is gradually accumulated inside the swing motor drive section M in which the hydraulic oil is shut off, When a high pressure is formed in the first chamber 24 connected to the recycling port A, the first spool 16 advances and part of the operating fluid present in the first chamber 24 flows into the first through- The central chamber 28 and the common relief valve 30 to the tank.

The second spool 18 is retracted to block the second flow path 40 and the second through hole 42 so that the operating fluid present in the center chamber 28 can not flow into the second chamber 26 State.

Of course, the first spool 16 advances and the second spool 18 corresponds to the first and second through holes 36 and 42 through the first and second orifice holes 50 and 52, respectively, The first and second flow paths 34 and 40 communicate with each other for a moment so that the first chamber 24, the center chamber 28 and the second chamber 26 communicate with each other. The switching movement of the second spools 16 and 18 is performed very quickly, and sufficient communication for pressure relief is not achieved.

In this way, the inertial force is reduced by the braking pressure accumulated in the first chamber 24, and the turning of the upper body of the excavator is stopped, but the reverse is started in the opposite direction due to the accumulated pressure. At this time, since the pressure of the operating oil is lower than the set pressure of the common relief valve 30, the operating oil of the first chamber 24, which has failed to escape through the common relief valve 30, The pressure of the working fluid in the second chamber 26, which has formed the low pressure, gradually increases.

When the operating oil pressure of the first chamber 24 and the operating oil pressure of the second chamber 26 become the same or similar to each other, the first and second orifice holes 50, The first flow path 34 and the first orifice hole 50 are formed by the first and second orifice portions 46 and 48 being positioned so as to communicate with the first and second flow paths 34 and 40, The center chamber 28, the second flow path 40, and the second orifice hole 50 communicate with each other, so that the communication flow of the operating fluid continues smoothly.

Accordingly, the pressure build-up in the first chamber (24) or the second chamber (26) is eliminated, and the reversion of the upper body of the excavator is prevented.

Therefore, when the reversal prevention valve for a construction equipment capable of sharing the relief valve according to the present invention is applied, it is possible to prevent the left-turn relief valve and the relief relief valve, which are connected to the left- (For example, a shuttle valve, a check valve), which is employed together with one of the relief valves, as well as a cost reduction by employing one of the relief valves, since the valve can be shared by one relief valve. And the use of connecting parts can be reduced, thereby remarkably reducing the manufacturing cost and significantly reducing the number of workings, thereby enhancing the productivity. In the figure, the reference symbol S is a spring.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But fall within the scope of the appended claims.

10: Anti-reverse valve
12: Valve mounting portion
14: Valve body
16: first spool
18: Second spool
20: first partition
22: second partition
24: First chamber
26: Second chamber
28: center chamber
30: Common relief valve
32: line
34: First Euro
36: First through hole
38:
40: the second euro
42: second through hole
44: second space portion
46: first orifice part
48: second orifice part
50: First orifice ball
52: second orifice ball

Claims (3)

A valve body 14 fixed within the valve mounting portion 12 and first and second spools 16 and 18 arranged to cooperate with each other while being accommodated in the valve body 14, In this case,
A first chamber 24 communicating with the left-turn swinging port A, a second chamber 26 communicating with the first swinging port B, a second chamber 26 communicating with the first swinging port B, A center chamber 28 formed between the first chamber 24 and the second chamber 26 and a common relief valve 30 connected to the center chamber 28;
A first passage 34 connected to the center chamber 28 in the form of a valve body 14 and a first through hole 36 connected to the first chamber 24;
A second flow path 40 connected to the center chamber 28 and a second through hole 42 connected to the second chamber 26;
The first orifice (36) and the first orifice (34) are formed in the first spool (16) so as to block communication or communicate with each other according to the movement position of the first spool (16) 46);
A second orifice portion 48 formed in the second spool 18 for blocking or communicating communication between the second through hole 42 and the second flow path 40 according to the movement position of the second spool 18, ;
Wherein the relief valve is formed to include a plurality of relief valves. The method according to claim 1,
The first chamber 24 and the second chamber 26 are formed in the valve mounting portion 12 such that the first chamber 24, the second chamber 26 and the center chamber 28 can be partitioned by the valve body 14, (20, 22);
A first flow path 34 connected to the center chamber 28 in a state of being formed in the valve body 14 with the first partition 20 therebetween and a first flow passage 36 connected to the first chamber 24 );
A second flow path 40 connected to the center chamber 28 in a state of being formed in the valve body 14 with the second partition 22 interposed therebetween and a second flow path 40 connected to the second chamber 26, 42);
Wherein the relief valve is formed to include at least one relief valve. The method of claim 2,
Wherein the first and second orifice portions (46) are formed of first and second orifice holes.

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