KR20090006657A

KR20090006657A - Front head assembly for hydraulic breaker

Info

Publication number: KR20090006657A
Application number: KR1020070070227A
Authority: KR
Inventors: 김동욱
Original assignee: 주식회사대신중공업
Priority date: 2007-07-12
Filing date: 2007-07-12
Publication date: 2009-01-15

Abstract

The present invention protects the front head by limiting the vertical movement of the chisel in the hydraulic breaker that breaks the crushed object such as rock or concrete by transmitting the striking force to the chisel through the up and down movement of the piston by the hydraulic pressure Regarding the front head protection structure of the hydraulic breaker to reduce the noise,

A piston 11 reciprocating in the hydraulic cylinder 10, a chisel 15 mounted to the front head 12 and crushing the object to be crushed while moving up and down by the impact of the piston 11, and the front head ( 12) includes a movement limiting means (20) installed on the top of the chisel inside to limit the movement of the chisel (15) using hydraulic pressure; The movement limiting means 20 is formed inside the front head 12 and has a predetermined length of the hydraulic chamber 21 filled with the fluid, and is installed at the top outside of the chisel 15 to move together with the chisel 15. It characterized in that it comprises a disk 22, the movement is limited by the hydraulic pressure in the hydraulic chamber 21.

Thus, the chisel does not collide with the components of the front head, and the sound of the piston and chisel blows occurs in the closed space, thereby obtaining sound insulation, and preventing other front head damage from impact accumulation.

Description

Front Head Assembly for Hydraulic Breaker

The present invention relates to a hydraulic breaker mounted on an excavator and to crush the crushed object such as rock or concrete through vertical movement by hydraulic, in particular a chisel for crushing movement using the impact force of the piston moved up and down by hydraulic This invention relates to a front breaker protection structure of a hydraulic breaker, which can protect the front head and reduce noise by restricting the movement of the oil through hydraulic pressure.

Hydraulic breaker is used as mounted on an excavator as shown in Figure 1, most of the kind of construction equipment used when breaking down buildings, digging roads or removing rocks such as mountain.

Conventional hydraulic breaker is, as shown in Figure 2, the piston 51 which is moved up and down by the hydraulic pressure and the cylinder 50 for guiding it, and is installed in the lower portion of the front head 12 and by the piston 51 It comprises a chisel 55 to crush the crushed object using the impact force. Accordingly, by the action of the cylinder 50, the piston 51 reciprocates up and down, hitting the top surface of the chisel 55, which causes a strong impact force on the tip of the chisel 55, thereby crushing the crushed object. It is.

Accordingly, the noise generated when the piston 51 hits the chisel 55 while the hydraulic breaker is operated and the noise generated when the chisel 55 breaks the crushed object are generated. This noise is generated using the hydraulic breaker. This is a very big disadvantage. In other words, when breaking a building or breaking a road in a downtown area, civil complaints are generated due to noise, which delays the construction time and entails separate costs for resolving civil complaints.

Therefore, various measures have been devised to reduce the blow noise generated when the piston 51 strikes the chisel 55, but most of the soundproofing materials are provided in the bracket to reduce noise between the piston 51 and the chisel 55. It is limited to how to insert it.

Meanwhile, in order to limit the movement of the chisel 55 mounted on the front head 12, a key groove 56 having a predetermined length having a smaller diameter of the upper part of the chisel inside the cylinder is formed and the key 53 is formed around the key head 56. Is installing. That is, when the upper end of the key groove 56 of the chisel 55 contacts the key 53, the lowering of the chisel 55 is stopped, and the lower end of the key groove 56 of the chisel 55 is connected to the key 53. When in contact, the lifting of the chisel 55 is stopped, thereby limiting the movement of the chisel 55.

However, the above-described conventional hydraulic breaker of the key structure has a problem that the chisel and the key continuously collides with the chisel up and down, so that the impact amount due to the collision accumulates and the front head may be destroyed.

In addition, there is another problem that additional impact noise occurs as the top and bottom of the chisel's key groove hit the key.

The present invention has been made to solve the above-mentioned conventional problems, and provides a front head protection structure of the hydraulic breaker to protect the front head and reduce noise by restricting the movement of the chisel by using hydraulic pressure without mechanically restricting the movement of the chisel. Its purpose is to.

The front head protection structure of the hydraulic breaker of the present invention for achieving the above object, the piston reciprocating in the interior of the hydraulic cylinder, the chisel is installed in the front head and crushed the crushed object while moving up and down by the impact of the piston; It is installed on the top of the chisel inside the front head, characterized in that it comprises a movement limiting means for limiting the movement of the chisel by using hydraulic pressure.

In addition, according to the front head protection structure of the hydraulic breaker of the present invention, the movement limiting means is formed in the inside of the front head and the fluid chamber of a predetermined length filled with the fluid, and is installed on the upper side of the chisel and moved together with the chisel. It characterized in that it comprises a disk whose movement is limited by the hydraulic pressure inside the chamber.

The front head protection structure of the hydraulic breaker according to the present invention does not cause the chisel to collide with other components due to the use of hydraulic pressure to limit the vertical movement of the chisel. This has the effect of being prevented.

Hereinafter, the front head protection structure of the hydraulic breaker of the present invention with reference to the accompanying drawings as follows.

3 is a configuration diagram showing the front head protection structure of the hydraulic breaker according to the present invention, Figure 4 is a cross-sectional view showing the movement limiting means when the piston hits the chisel, Figure 5 is when the piston is raised Figure 6 is a cross-sectional view showing the shape of the movement limiting means, Figure 6 is a detailed cross-sectional view showing the portion "A" of FIG.

The chisel protection structure of the hydraulic breaker of the present invention is provided with a piston 11 reciprocating inside the hydraulic cylinder 10 and the front head 12 and moving up and down by the impact of the piston 11. It comprises a chisel 15 to crush the crushed object, and a movement limiting means 20 is installed on the top of the chisel inside the front head 12 to limit the movement of the chisel 15 by using hydraulic pressure.

Here, the movement limiting means 20 is formed inside the front head 12 and the hydraulic chamber 21 of a predetermined length filled with the fluid, and installed outside the chisel 15, the chisel 15 and The disk 22 is moved together and the movement is limited by the hydraulic pressure in the hydraulic chamber 21.

The front head protection structure of the hydraulic breaker of the present invention configured as described above limits the movement of the chisel by using hydraulic pressure when the chisel is reciprocated up and down by the piston to protect the front head and prevent the noise of collision.

When the piston 11 reciprocated by the hydraulic cylinder 10 hits the upper end of the chisel 15, the chisel 15 descends to crush the crushed object. As the chisel 15 is lowered, the disk 22 is lowered in the hydraulic chamber 21 to compress the fluid of the lower hydraulic chamber 21a. At this time, a part of the fluid in the lower hydraulic chamber 21a is leaked between the disk 22 and the inner wall of the hydraulic chamber 21 to move to the upper hydraulic chamber 21b, but most of the fluid is compressed in the lower hydraulic chamber 21a. It will remain Therefore, as the hydraulic pressure in the lower hydraulic chamber 21a increases, the lowering of the disk 22 is restricted, and as the lowering of the disk 22 is restricted, the lowering of the chisel 15 is also stopped.

On the other hand, since the disk 22 is not in direct contact with the cover of the hydraulic cylinder 10 due to the compressed fluid of the lower hydraulic chamber 21, the collision noise between the disk 22 and the cover does not occur. Of course, the chisel 15 also does not collide with other components so that the chisel 15 is not subjected to an additional impact other than the impact caused by the piston 11 or the impact of the crushing operation.

Afterwards, when the piston 11 is raised, the pressure applied to the chisel 15 is removed, and the chisel 15 is raised by the pressing force of the excavator to move to the initial position. Therefore, the disk 22 also rises in the hydraulic chamber 21, and the pressure in the lower hydraulic chamber 21a is lowered. As the disk 22 rises, the pressure in the upper hydraulic chamber 21b rises, and the lift of the disk 22 is restricted by the fluid compressed in the upper hydraulic chamber 21b. Therefore, even when the chisel 15 is raised, the disk 22 and the chisel 15 do not come into direct contact with other components, so that collision noise is not generated.

At this time, the disk 22 installed on the top of the chisel 15 is moved up and down together with the chisel 15 in the hydraulic chamber 21, as the disk 22 is moved up and down only in the hydraulic chamber 21 Completion of the moving speed of the chisel 15 is adjusted by the length and the internal pressure of the hydraulic chamber 21.

As a result, even if the chisel 15 moves up and down, it does not collide with other components, thereby preventing noise from collision and preventing damage to the front head 12 due to the accumulation of impact.

1 is a state diagram used in the general hydraulic breaker.

2 is a configuration diagram showing a conventional hydraulic breaker.

3 is a configuration diagram showing the front head protection structure of the hydraulic breaker of the present invention.

Figure 4 is a sectional view showing the state of the movement limiting means when the piston hits the chisel.

5 is a cross-sectional view showing the shape of the movement limiting means when the piston is raised.

FIG. 6 is a detailed cross-sectional view of portion “A” of FIG. 4.

10: hydraulic cylinder

11: piston

15: Chisel

20: movement limiting means

21: hydraulic chamber

21a: Lower hydraulic chamber

21b: Upper hydraulic chamber

22: disc

Claims

A piston 11 reciprocating in the hydraulic cylinder 10, a chisel 15 mounted to the front head 12 and crushing the object to be crushed while moving up and down by the impact of the piston 11, and the front head ( 12) Front head protection structure of the hydraulic breaker, characterized in that it comprises a movement limiting means (20) installed on the top of the chisel in the interior to limit the movement of the chisel (15) by using hydraulic pressure.

The method of claim 1,

The movement limiting means 20 is formed inside the front head 12 and filled with an oil-filled hydraulic chamber 21 having a predetermined length, and is installed outside the upper end of the chisel 15 to move together with the chisel 15. And the front of the hydraulic breaker of the hydraulic breaker, characterized in that it comprises a disk (22) movement limited by the hydraulic pressure in the hydraulic chamber (21).