KR101149834B1 - Oil pressure breaker prevented no-load strikes - Google Patents

Abstract

PURPOSE: A hydraulic breaker with an idle blow prevention device is provided to maintain an accurate opening and closing work by actively treating the pressure change of fluid. CONSTITUTION: A hydraulic breaker with an idle blow prevention device comprises an idle blow prevention selecting valve(6). The idle blow prevention selecting valve is installed inside a chamber(7) formed between first and second transfer paths(L4,L5) and controls the flow of fluid. The idle blow prevention selecting valve comprises a main body(7), a plunger(8), an elastic body(9), and a plug(10). The main body has an inlet path(72), an outlet path(75), and an operation path(71). The plunger is inserted into the operation path of the main body and opens and closes the inlet path. The elastic body is inserted into the plunger. The plug is coupled to the outer side of the main body and supports the elastic body.

Description

Hydraulic breaker with anti-hit device {OIL PRESSURE BREAKER PREVENTED NO-LOAD STRIKES}

The present invention relates to a hydraulic breaker equipped with an anti-ballout device, and more particularly, is automatically opened to allow a high-pressure fluid to pass through, and a low-pressure fluid lower than a certain pressure to block the movement to prevent the anti-ballout device. The invention relates to a hydraulic breaker equipped with an anti-ballout device to operate correctly.

In general, the hydraulic breaker is a device that delivers the kinetic energy generated during the reciprocating motion of the piston to the chisel by hitting it, and breaks up the crushed object such as rock or concrete.It is connected to the hydraulic power source of the excavator through the supply line and the return line. It is operated by receiving pressure oil from the pump.

In general, breakers are divided into cylinders forming the breaker body, pistons movably installed in the cylinders, chisels installed under the cylinders to be hit by the pistons, and pistons by selectively supplying pressure oil to the cylinder compartment and the cylinder chamber. It consists of a hydraulic system consisting of a valve device for reciprocating.

The piston is driven by hydraulic pressure to reciprocate between the raised position and the striking position, and is configured to strike the chisel in the striking position.

The chisel converts the kinetic energy of the piston into impact energy and transmits the shock to the crushed object. When the piston descends from the rising position to the striking position, it is hit by the piston.

The hydraulic system of the breaker is equipped with a valve device to control the direction of the hydraulic oil flowing into the breaker and supplied to the cylinder.

The control valve reciprocates between the first position and the second position depending on the position of the reciprocating piston. In the first position, the control valve is connected to the low pressure flow path by a high pressure which is always in the cylinder base. Move the piston from the striking position to the up position.

In the second position, the cylinder loss is connected to the high pressure flow path to move the piston from the rising position to the striking position.

The upper end of the piston is provided with a cylinder gas chamber in which the compressed gas is injected to be further compressed as the piston rises, this gas pressure increases the speed of movement of the piston when the piston descends.

The chisel is movably installed in the lower part of the cylinder and is supported by the chisel pin so as not to be released from the breaker.

By operating the excavator, the chisel is brought into contact with the crushed object and the breaker is pressed to push the chisel up and raise the piston to the hitting position.

Thus, by applying a mechanical external force to the breaker and pressing the chisel in contact with the crushed object, moving the chisel to a position where it can be hit by the reciprocating piston is called a "preload" of the breaker.

If the chisel is not preloaded, that is, the chisel is caught in the chisel pin, the piston moves from the up position to the striking position, causing the piston to not hit the chisel and directly hit the cylinder, causing excessive stress on the piston and the cylinder. Let's go. This phenomenon is called “no-load strikes” or idle blows, and it is one of the main causes of shortening of the service life by causing breaker failure.

During a crushing operation with a breaker, after the moment the crushed object is completely crushed, the chisel will no longer be supported by the crushed object and will be lowered down.If the driver does not stop the breaker immediately, the breaker will continue to run at idle. do.

A breaker is a device that operates at a high strike frequency of 5 to 15 Hz.It usually takes a certain time to stop the operation after the crushed object is crushed by the driver. It is common for conference strikes to occur.

In order to remedy this problem, some breaker manufacturers have been proposed a technology for the breaker to detect the above-described idle state by itself so that the breaker does not continue to operate in idle state even if the driver does not stop the breaker operation.

As an example of the breaker prevention device of such a breaker, Korean Patent Publication No. 1996-4277 and US Patent No. 6,334,495 have been proposed.

This technique moves the piston downwards from the striking position and moves to the lowest position (hereafter referred to as the "vacant position") in contact with the cylinder, thereby hydraulically restraining the piston and the control valve and closing the hydraulic system controlling them. It has a ball prevention device that prevents the occurrence of a ball.

In addition, Korean Patent No. 0510966 discloses an anti-ballast device for a hydraulic breaker.

Looking at the Korean Patent No. 0510966, it is further provided with a flow path blocking means for blocking the anti-vibration line, the flow path blocking means is an anti-off selection valve is integrally formed with the flow resistance means, the anti-off selection valve Is configured to be switched to any one of the flow path blocking means and the flow resistance means according to the user's operation.

A detailed description of the anti-offense line is described in detail in the patent publication, so please refer to it.

By the way, the anti-outlet selection valve according to the prior art is an orifice type in which a flow path is formed. This is a flow path hole having a diameter most optimized for the pressure by calculating the flow pressure of the fluid in advance. The flow rate and flow rate of the different from the design value of the hydraulic control is not made accurately, which causes a problem that causes the malfunction of the anti-ballout function.

The present invention has been made to solve the above-mentioned problems of the prior art, it is connected to the anti-ballast device mounted on the hydraulic breaker than the pressure designed by having an anti-ball selector valve that can be actively opened and closed by the applied hydraulic pressure It is an object of the present invention to provide a hydraulic breaker equipped with an anti-vibration prevention device capable of maintaining stable opening and closing operation even if the variable hydraulic pressure is applied, so that the performance of the anti-vibration preventing device can be stably maintained.

In order to achieve the above object, the hydraulic breaker provided with the anti-ballout device according to the present invention is installed in a chamber provided between the first transfer path and the second transfer path of the high-pressure fluid for anti-ballout to prevent the fluid flow. A hydraulic breaker provided with an anti-ballast device comprising: the second transfer passage is formed in the chamber in the same direction as the first transfer passage; The anti-outlet selection valve has an inflow path through which the high pressure fluid flows in one end facing the first transfer path, an outflow path through which the inflow high pressure fluid flows out, and the high pressure fluid therein. A main body having an operating passage for opening and closing the inflow of the main body ; A plunger inserted into an operation passage of the main body to open and close the inflow path to open and close the inflow of the high pressure fluid; An elastic body that causes the plunger to elastically close the inflow path; A plug for sealing the operation passage formed in the main body and supporting the elastic body, wherein the main body is installed in a chamber, and the main body and the plug are coupled by screwing in the same direction as the first transfer path. It is characterized by.

In addition, in the hydraulic breaker provided with an anti-ballast device according to the present invention, the plunger is formed with a flow path therein, a stepped portion is formed to support the elastic body on the inner circumference, the outer peripheral surface has a plurality of holes communicating with the flow path Is formed, the plunger is characterized in that the disk is attached to one end in close contact with the inlet.

In order to achieve the above object, the hydraulic breaker provided with the anti-ballout device according to the present invention is installed in a chamber provided between the first transport path and the second transport path of the high-pressure fluid for anti-ballout to prevent the fluid flow. In the hydraulic breaker provided, an inflow path through which the high pressure fluid flows is formed at one end facing the first transport path, and an outflow path through which the inflow high pressure fluid flows is formed in the side, and the outflow flows therein. A main body having an operating passage for controlling the furnace; A closing means integrally formed at a front end portion, and a sealing means inserted into an operating passage of the main body to block the inflow of the high pressure fluid; and the second transfer passage includes the first opening in the chamber. Is formed in the same direction as the transfer passage, the main body is installed in the chamber, the main body and the sealing means is coupled by screwing in the same direction as the first transfer passage in the working passage formed in the main body It is characterized by closing the inlet.

According to the present invention, by providing the anti-ball selection valve, it is possible to actively maintain the precise opening and closing operation in response to the pressure fluctuations of the fluid has the effect that the performance of the anti-ballout device can be stably maintained.
In addition, according to the present invention, when the hydraulic breaker (A) is not used for a long time, it is possible to prevent leakage of the fluid and to maintain the best state by blocking the inflow of foreign substances.
In addition, according to the present invention there is an effect that can easily exchange the plunger and the elastic body which is a part of the anti-ballout selection valve.

1 is a view showing a hydraulic breaker according to the present invention,
Figure 2a is an enlarged view of the "anti-ball selection valve" in Figure 1,
Figure 2b is a view showing the "sealing means" to replace the anti-ball selection valve,
3 to 9 are views sequentially showing the operation of the hydraulic breaker according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a hydraulic breaker according to the present invention, Figure 2a is an enlarged view of the "anti-ball selection valve" in Figure 1, Figure 2b is a view showing a "sealing means" to replace the anti-ball selection valve, Fig. 3 to 9 are views sequentially showing the operation of the hydraulic breaker according to the present invention.

1 and 2, the hydraulic breaker A according to the present invention includes an upper chamber 22, a recovery chamber 23, and a lower chamber in which the hydraulic supply means 1 are mounted and the fluid is concentrated. A cylinder 2 on which 21 is formed; A piston (3) coupled to the inside of the cylinder (2) for lifting and lowering operation by the pressure of the fluid; It comprises a chisel (5) for applying a hitting force of the piston (3) and repeatedly hitting the object while hitting the object and a control valve (4) to control the flow of fluid.

On the outer circumferential surface of the piston 3, a plurality of large diameter portions 32 corresponding to the upper chamber 22, the recovery chamber 23, the lower chamber 21, and the like are formed.

The hydraulic pressure supply means 1 includes an accumulator 11 to which a high pressure fluid (indicated by a solid line in the drawing) is supplied, and a lower chamber communicating with the accumulator 11 and formed inside the cylinder 2 ( A first transport path L1 leading to 21); A second conveying path (L2) formed through the lower chamber (21) and through the control valve (4); A third transfer path (L3) formed to open the high pressure fluid into the upper chamber (22) by opening the control valve (4); First and second transfer paths L4 and L5 communicating with the second transfer path L2 and connected to a recovery chamber 23; It is connected to the recovery chamber 23 and comprises a recovery passage (L8) for recovering the fluid of low pressure (indicated by the dotted line in the drawing).

The first and second transfer passages L4 and L5 are connected to the chamber 70, and the chamber 70 has no anti-ballast to control the fluid flow of the first and second transfer passages L4 and L5. The selector valve 6 is coupled.

As shown in FIG. 2A, the anti-ballout selection valve 6 is coupled to the chamber 70, an inflow path 72 is formed at one end, and an outflow path 75 is formed at a side thereof, and an operating passage therein. A main body 7 on which 71 is formed; A plunger (8) which opens and closes the inflow path (72) while being inserted into and operated in the inner working passage (71) of the main body (7); An elastic body 9 inserted into the plunger 8; It is configured to include a plug 10 is coupled to the outside of the main body 7 and seals and supports the elastic body (9).

The chamber 70 is formed in a substantially cylindrical shape, and a thread is formed on an inner circumferential surface near the inlet so that the main body 7 is screwed.

The main body 7 has a cylindrical shape and a protrusion 76 having a thread formed on an outer circumferential surface of the middle portion is formed, and an O-ring 77 is interposed on the outer circumferential surface of the front end to be in close contact with the mating end of the chamber 70 to be hermetically coupled. do.

In addition, a thread is formed on the inner circumferential surface adjacent to the inlet of the operation passage 71 formed inside the main body 7 so that the plug 10 is screwed together.

The plunger 8 is inserted into the inner working passage 71 of the main body 7 to move up and down, so that the disk 81 at its tip opens or closes the inflow passage 72.

In addition, the plunger 8 has a flow path 84 formed therein, and the stepped portion 83 is formed to support the elastic body 9 at the inner circumference, and a plurality of holes 82 communicating with the flow path 84 are formed on the outer circumference. And a disk 81 is attached to one end to open and close the inflow path 72.

The elastic body 9 is preferably a normal coil spring.

The plug 10 is to seal and seal the main body 7, and the thread is formed on the outer circumferential surface to be screwed to the thread formed on the inner circumferential surface of the main body 7.

On the other hand it is further included a sealing means for sealing to replace the anti-outlet selection valve (6).

As shown in FIG. 2B, the sealing means 11 has a screw thread formed on an outer circumferential surface thereof and is screwed to the chamber 70, and a closing hole 112 is integrally formed at the front end portion thereof so that the first transfer path L4 is formed. Can be sealed by sealing.

This is selected to prevent the leakage of fluid when the hydraulic breaker (A) is not used for a long time, and to block the inflow of foreign substances to maintain the best state.

Referring to the operating relationship of the present invention configured as described above are as follows.

1 is in its initial state and is an initial stage without fluid transfer.

Thereafter, as shown in FIG. 3, the high pressure fluid flows through the first transfer path L1 and begins to be supplied to the lower chamber 21 of the cylinder 2, and the piston 3 is prepared to rise to the right. It is moved and moved to the hitting position.

At this time, the low pressure fluid staying in the upper chamber 22 is supplied to the control valve 4 through the third transfer path L3 to maintain the control valve 4 in the lowered state.

In this state, the anti-ballout selection valve 6 is closed by the plunger 8 blocking the inflow path 72 of the main body 7 by the pressurization of the elastic body 9.

Then, as shown in FIG. 4, when more fluid of high pressure is supplied to the lower chamber 21 of the cylinder 2, the pressure is raised (the right side in the drawing) by the piston 3 and the chisel 5. Spaced apart from the.

In addition, the high pressure fluid introduced into the lower chamber 21 flows into the second transfer path L2 and is supplied to the control valve 4, and the control valve 4 is raised (the right side in the drawing).

5, the high pressure fluid begins to flow into the third transfer path L3 while being opened due to the high pressure fluid introduced into the control valve 4, and is immediately concentrated in the upper chamber 22. The piston 3 is lowered to generate power to move it to the left.

6, the piston 3 begins to be lowered (left side in the drawing) by the high pressure fluid concentrated in the upper chamber 22. At this time, the low pressure fluid is recovered through the recovery chamber 23.

Afterwards, as shown in FIG. 7, the striking force can be exerted by lowering the piston 3 to hit the chisel 5, and the high pressure fluid is filled in the upper chamber 22 to the first transfer path L4. Will come close.

Then, as shown in FIG. 8, when the piston 3 is completely lowered, the high pressure fluid filled in the upper chamber 22 flows into the chamber 70 through the first transfer passage L4 to prevent anti-ballout selection. The valve 6 is opened.

That is, the high pressure fluid is introduced through the inflow path 72 of the main body 7 through the first transport path L4 to push and open the plunger 8, and then the second transport path through the outflow path 75. It is supplied to (L5) and flows into the control valve (4).

The high pressure fluid introduced into the control valve 4 is circulated to the upper chamber 22 through the third transfer path L3 again.

At this time, the piston (3) is placed in the anti-hit position. That is, even if the high-pressure fluid is no longer supplied, the piston 3 cannot be lowered and circulated via the anti-ballout selection valve 6, so no ball is generated.

Thereafter, as shown in FIG. 9, when the piston 3 is further lowered, the high pressure fluid flows into the recovery chamber 23, is recovered through the recovery path L8, and is drained to the low pressure port L7.

Therefore, a part of the high pressure fluid is recovered and drained so that the fluid flowing through the first transfer passage L4 is reduced in pressure, and the plunger 8 is driven by the restoring force of the elastic body 9 of the anti-ballout selection valve 6. Is operated to block the inlet passage 72, so that the second transfer passage L5 is blocked from transferring the fluid.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, all such modifications and modifications being attached It is obvious that the claims belong to the claims.

1: hydraulic supply means 2: cylinder
4: control valve 5: chisel
6: Anti-ball selector valve 7: Body
9: elastic body 21: lower thread
22: upper chamber 23: recovery chamber

Claims (4)

In the hydraulic breaker provided with an anti-ballast prevention device including an anti-battery selection valve mounted inside the chamber provided between the first transfer path and the second transfer path of the high-pressure fluid for anti-ballout to control the fluid flow,
The second transfer passage is formed in the chamber in a direction that is not the same as the first transfer passage;
The anti-outlet selection valve has an inflow path through which the high pressure fluid flows in one end facing the first transfer path, an outflow path through which the inflow high pressure fluid flows out, and the high pressure fluid therein. A main body having an operating passage for opening and closing the inflow of the main body ; A plunger inserted into an operation passage of the main body to open and close the inflow path to open and close the inflow of the high pressure fluid; An elastic body that causes the plunger to elastically close the inflow path; A plug for sealing the operation passage formed in the main body and supporting the elastic body;
The main body is installed in the chamber, the main body and the plug is a hydraulic breaker with an anti-ballout device, characterized in that coupled by screwing in the same direction as the first transfer passage. The method of claim 1,
The plunger has a flow path formed therein, a stepped portion is formed to support the elastic body at an inner circumference, and a plurality of holes communicating with the flow path are formed at an outer circumferential surface thereof, and the plunger has a disk attached at one end thereof to the inflow path. Hydraulic breaker is provided with an anti-ballout device characterized in that the close contact. delete In the hydraulic breaker provided with an anti-ballout device mounted inside the chamber provided between the first transfer path and the second transfer path of the high-pressure fluid for preventing the ball flow,
An inflow path through which the high pressure fluid flows is formed at one end facing the first transport path, and an outflow path through which the inflow high pressure fluid flows is formed at a side thereof, and an operation passage for controlling the outflow path therein. The main body is formed;
A closing means integrally formed at a front end portion, and the closing means is inserted into an operation passage of the main body to block the inflow of the high pressure fluid; and
The second transfer passage is formed in the chamber in a direction that is not the same as the first transfer passage, the main body is installed in the chamber,
And the main body and the sealing means are coupled by screwing in the same direction as the first transfer path in the operation passage formed in the main body to close the inflow path.

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