WO2022055219A1

WO2022055219A1 - Hydraulic breaker chisel

Info

Publication number: WO2022055219A1
Application number: PCT/KR2021/012115
Authority: WO
Inventors: 정문교
Original assignee: 주식회사 맵
Priority date: 2020-09-14
Filing date: 2021-09-07
Publication date: 2022-03-17
Also published as: KR102266336B1

Abstract

The present invention provides a hydraulic breaker chisel, which is struck by a piston provided to reciprocate inside a hydraulic breaker, and comprises: a shaft-shaped chisel body having a conical crushing part provided at the lower end thereof, and having, at one side thereof, a mounting groove part tapered such that the diameter thereof gradually decreases from the upper side to the lower side thereof; a compression elastic body, which is made of a soft material, is provided in the mounting groove part so as to be inserted into and disposed at the outer side of the chisel body, and absorbs and reduces vibration that moves in the axial direction of the chisel body, while being compressed toward the inner side of the chisel body by inertia when the piston strikes the chisel body; and a coil-type elastic spring which is coupled to and provided in the inner portion of the compression elastic body so as to be inserted into and disposed on the outer side of the chisel body, thereby elastically supporting the compression elastic body, and which increases compressive force, generated from the compression of the compression elastic body toward the inner side of the chisel body, so as to increase the absorption rate of vibration that moves in the axial direction of the chisel body, while being compressed toward the inner side of the chisel body by inertia when the piston strikes the chisel body.

Description

Chisel for Hydraulic Breaker

The present invention relates to a chisel for a hydraulic breaker that reduces vibration and shock repulsion generated in the process of being struck through a piston of a hydraulic breaker mounted on an excavator.

In general, hydraulic breakers are equipment that is installed in construction machines such as excavators and loaders to crush rock or concrete, and when the cylinder is operated, the piston moves up and down and hits a chisel, which is a crushing tool, and the chisel is used in concrete and rock, etc. It crushes by applying an impact force.

The noise generated during the crushing operation using the hydraulic breaker is divided into a hitting noise generated when the piston hits the chisel and a crushing noise generated when the chisel crushes concrete and rock. Most of them are hitting noise, and the number varies depending on the size of the hydraulic breaker, but it is approximately 90~110dB.

Recently, as regulations on noise and vibration have been strengthened, the noise level indication of construction equipment has been changed from a reporting system to a mandatory system, and products such as excavators, bulldozers, loaders, and breakers have been designated as obligatory noise level indication targets. In order to respond to these noise and vibration regulations, the development of a low-noise type breaker is being actively carried out.

In particular, related organizations are also encouraging the development of low-noise breakers, such as certifying low-noise breakers for breakers that satisfy noise regulations.

Looking at the conventional hydraulic breaker 1 with reference to FIG. 1 , the hydraulic cylinder 10 , the piston 20 installed movably up and down inside the hydraulic cylinder 10 , and the lower part of the hydraulic cylinder 10 . It includes a front head 30 coupled to, and a chisel 40 installed on the front head 30 and struck by the piston 20 . A gas chamber 12 is provided at the upper end of the hydraulic cylinder 10, a valve 14 is formed on the side surface of the hydraulic cylinder 10, and hydraulic oil is temporarily stored in the lower side adjacent to the valve 14 as a kinetic energy source. An accumulator 50 for use is formed. In addition, the chisel 40 is supported by the upper bush 60 provided inside the middle of the front head 30 and the lower bush 70 coupled to the lower end of the front head 30 . And an insertion groove (not shown) is formed inside the lower bush 70, and a vibration-proof material (not shown) may be installed in the insertion groove.

The chisel 40 is struck by the piston 20 and vibrates by itself while transferring the kinetic energy of the piston 20 to the crushed object. That is, when the piston 20 descends and hits the top surface of the chisel 40, a stress wave accompanying elastic compression deformation is generated on the striking surface of the chisel 40 by the impact energy of the piston 20, this stress The wave is transmitted to the lower end along the body of the chisel 40 and finally reaches the contact surface with the object to be crushed, thereby performing the crushing operation.

At this time, if the piston 20 and the chisel 40 collide in a straight line, the compressive stress wave is transmitted along the center line of the chisel 40 so that left-right or lateral vibration of the chisel 40 does not occur. However, in the actual case, the respective center lines do not coincide, and the chisel 40 is eccentrically struck when hitting by the gap between the chisel 40 and the upper bush 60 and the lower bush 70 , and the chisel 40 . By forming the center of the contact surface of the piston 20 and the chisel 40 at a point deviating from the center line of the chisel 40, bending deformation of the chisel 40 is generated by the impact force generated at this time. Accordingly, the chisel 40 is deformed as well as the stress wave transmitted along the chisel 40 is in the form of a compressive stress wave accompanied by bending stress. At this time, a part of the stress wave reaching the interface with the crushed object is diffused and absorbed into the crushed object, and the remaining part is reflected back and transmitted toward the striking surface with the piston 20, and then returns to the reverse direction again. will repeat In this process, the stress waves are overlapped at the point where two stress waves propagating in different directions meet, and the amplitude of the stress waves becomes conspicuous at a specific frequency by such overlap, and vibration and noise are generated as well as the chisel (40). There is a problem of reducing the service life.

Such a technology related to a hydraulic breaker is presented in Korean Patent Registration No. 10-1712553 (2017.02.27).

An object of the present invention is to provide a chisel for a hydraulic breaker that reduces vibration and noise generated in the process of crushing by a piston and crushing objects.

In the present invention, in the chisel for a hydraulic breaker installed inside the hydraulic breaker and struck by a reciprocating piston, a conical crushing part is provided at the lower end, and a tapered installation groove is provided on one side so that the diameter decreases from the upper side to the lower side. A axial chisel body formed with an additional portion is installed in the installation groove to be inserted and disposed on the outside of the chisel body, and when the piston hits the chisel body, it is compressed in the chisel body direction by inertia and moves along the axial direction of the chisel body A soft compressive elastic body having elasticity to absorb and reduce vibration, and molded and coupled to the inside of the compressive elastic body in an integral state so that it can be inserted and disposed on the outside of the chisel body, the piston elastically supports the compressed elastic body Coil type having elasticity to increase the absorption rate of vibration moving along the axial direction of the chisel body by increasing the compressive force that is compressed in the inner direction of the chisel body while the compressed elastic body is compressed in the inner direction of the chisel body when hitting the chisel body It provides a chisel for a hydraulic breaker comprising; an elastic spring of

In addition, the rim portion of the chisel body positioned above and below the installation groove portion may be formed with a separation prevention end protruding in the direction of the installation groove portion to catch the upper and lower portions of the compression elastic body.

In addition, a plurality of contact insertion grooves are formed to be spaced apart from each other at regular intervals in the vertical direction in the portion where the installation groove portion of the chisel body is formed, and the contact protrusion may be formed to protrude to be inserted corresponding to the contact insertion groove on the inner circumferential surface of the compressed elastic body. .

In addition, the size of the inner diameter of the elastic spring may be formed to decrease from the upper end of the chisel body toward the lower end.

In addition, the contact insertion groove may be formed in a tapered shape such that the diameter of the chisel body decreases from the upper side to the lower side of the chisel body.

In the chisel for a hydraulic breaker according to the present invention, the compression elastic body and the elastic spring are inserted and installed in the installation groove of the chisel body. The compression force is transmitted in the inner center direction to reduce the vibration of the chisel body, thereby reducing noise and increasing the striking force against the crushed object. In addition, the impact repulsive force through the blow of the crushed object of the chisel body is also transmitted to the inner center direction of the chisel body as the compressive elastic body and the elastic spring are compressed by the inertial force, thereby reducing the vibration of the chisel body. A stable striking force is generated while maintaining the position where the chisel body is hit by the piston again after that in its original position.

1 is a schematic structural cross-sectional view of a conventional hydraulic breaker.

2 is a perspective view of a chisel for a hydraulic breaker according to an embodiment of the present invention.

3 is an enlarged perspective view of a portion 'A' shown in FIG. 2 .

4 is an exploded perspective view of part 'A' shown in FIG. 2 .

FIG. 5 is a cross-sectional view of part 'A' shown in FIG. 3 .

6 is a perspective view according to another embodiment of the compressive elastic body shown in FIG.

7 is a perspective view according to another embodiment of the elastic spring shown in FIG.

8 is a simulation result image of measuring the acceleration in the crushing part when hitting the iron plate of the conventional hydraulic breaker chisel and the hydraulic breaker chisel of the present invention.

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

2 is a perspective view of a chisel for a hydraulic breaker according to an embodiment of the present invention, FIG. 3 is an enlarged perspective view of part 'A' shown in FIG. 2, and FIG. 4 is an exploded perspective view of part 'A' shown in FIG. and FIG. 5 is a cross-sectional view of part 'A' shown in FIG. 3 . 2 to 5 , the chisel 100 for a hydraulic breaker according to an embodiment includes a chisel body 110 , a compression elastic body 120 , and an elastic spring 130 . Here, the chisel 100 for a hydraulic breaker operates to crush the shredding object while moving after being struck by a piston that reciprocates by hydraulic pressure inside the cylinder. At this time, the hydraulic breaker has the same configuration as in the prior art, and a detailed description of the specific configuration of the hydraulic breaker is omitted here.

The chisel body 110 is a portion having an axial shape hit by a piston reciprocating in the vertical direction by hydraulic pressure. A conical crushing part 111 is provided at the lower end of the chisel body 110 so as to be crushed when it collides with a crushed object while moving downward by the piston. Here, the chisel body 110 is formed to have a smaller outer diameter from the lower edge portion where the installation groove portion 112 is formed to the upper edge portion of the crushing unit 111 to be described later, and the compression elastic body 120 and the elastic spring to be described later. The 130 can be easily inserted and installed on the outside of the chisel body 110 in which the installation groove 112 is formed.

In addition, an installation groove 112 is formed around the outer surface of the chisel body 110 at one side between the upper end and the lower end in the vertical direction of the chisel body 110 . This, the installation groove 112 allows the compression elastic body 120 and the elastic spring 130 to be described later to be coupled and installed on one side of the chisel body 110 in a state of being caught on one side of the chisel body 110, so that the chisel body 110 by the piston is damaged. When a corresponding inertial force occurs, the compressive elastic body 120 and the elastic spring 130 are connected and supported so that compression can be stably made, and after a certain time elapses, that is, the magnitude of the inertial force increases with the compressive elastic body 120 and the elastic spring ( At a point in time when the size of the elastic restoring force of 130) becomes smaller than the size of the elastic restoring force, the compressive elastic body 120 and the elastic spring 130 serve to support the elastic restoration to the original state.

Here, the installation groove 112 of the chisel body 110 is formed in a tapered shape such that the diameter of the chisel body 110 decreases from the upper side to the lower side. In addition to stably transmitting the crushing part 111 in the direction, the compressive elastic body 120 and the elastic spring 130 according to inertia transmit the compressive force in the inner center direction of the chisel body 110 while compressing the elastic body ( 120) and stably reducing vibration through stable compression of the chisel body 110 by the elastic spring 130.

In addition, a separation prevention end 113 is formed to protrude in the direction of the installation groove 112 on the edge of the chisel body 110 positioned above and below the installation groove 112 . The separation prevention end 113 is to engage the upper and lower portions of the compressed elastic body 120 inserted and disposed in the installation groove 112, and the compressed elastic body 120 and the elastic spring 130 are the chisel body 110. ) to prevent separation from the installation groove 112 when it is compressed in a state inserted and arranged on the outside or elastically restored from the compressed state to its original state.

In addition, a contact insertion groove 114 is formed around the outer surface of the chisel body 110 in which the installation groove portion 112 is formed. A plurality of the contact insertion grooves 114 are formed to be spaced apart from each other at regular intervals in the vertical direction of the chisel body 110 , that is, the axial direction of the chisel body 110 . Further, the contact insertion groove 114 is formed in a tapered shape such that the diameter of the chisel body 110 decreases from the upper side to the lower side of the chisel body 110 . As such, the contact insertion groove 114 is formed in a tapered shape to increase the contact area with the inner circumferential surface of the compressed elastic body 120 and the compressed elastic body 120 is inserted into the chisel body 110 in a stable locking state. do.

When the compression elastic body 120 and the elastic spring 130 are compressed according to the inertia of the chisel body 110 by the piston by the contact insertion groove 114, toward the inner center of the chisel body 110. The compressive force is stably distributed and transmitted, and the compressive elastic body 120 also serves to support the inner circumferential surface of the compressed elastic body 120 so that it can be stably restored to its original state after compression. In addition, the contact insertion groove 114 enables the corresponding insertion of the contact protrusion 121 formed on the inner circumferential surface of the compressed elastic body 120 , and the inner surface of the compressed elastic body 120 is on the outer surface of the chisel body 110 . Stable coupling is achieved in the inserted state. In this way, when the contact insertion groove 114 of the chisel body 110 and the contact protrusion 121 of the compressed elastic body 120 are disposed to correspond to each other, the inner circumferential surface of the compressed elastic body 120 is on the outer circumferential surface of the chisel body 110 When the chisel body 110 is hit by the piston while maintaining a certain position, the compression force according to the inertia of the compressed elastic body 120 is distributed and transmitted toward the center of the chisel body 110, and the vibration of the chisel body 110 is to reduce what is happening.

The compressed elastic body 120 moves the piston downward by hydraulic pressure, and is compressed when the lower side of the piston is in contact with the chisel body 110 and hits the upper side of the chisel body 110. After a certain period of time, it is elastic again to its original state It is a part that absorbs the vibration of the chisel body 110 while being restored and allows the striking stress to be transmitted linearly in the axial direction of the chisel body 110 . That is, when the compressive elastic body 120 hits the chisel body 110 by the downward movement of the piston by hydraulic pressure, it is compressed toward the inner center of the chisel body 110 through an inertial force while transmitting the compressive force to the chisel body 110 . and absorbs the vibration of the chisel body 110 through this. In this way, the compressive elastic body 120 absorbs vibrations generated in the chisel body 110 when the chisel body 110 is struck with a piston so that the striking stress is transmitted linearly in the axial direction of the chisel body 110 to the crushed object. to increase striking power.

In addition, the compressed elastic body 120 is elastically restored to its original state after a certain period of time has elapsed in the compressed state, that is, when the magnitude of the inertial force generated by the impact of the piston becomes smaller than the magnitude of the elastic restoring force, the chisel The body 110 is reduced to a compressed state by the inertial force even with respect to the vibration transmitted from the lower end to the upper end while striking the object to be shredded. As such, when the vibration transmitted from the lower end to the upper end of the chisel body 110 is reduced while the lower end of the chisel body 110 hits the crushed object, the distance between the outer surface of the chisel body 110 and the inner wall of the hydraulic breaker is reduced. Stable striking force while stably maintaining the chisel body 110 to prevent damage due to the contact between the outer surface of the chisel body 110 and the inner wall of the hydraulic breaker and maintaining the position where the chisel body 110 is hit by the piston again afterward make it happen

Such, the compressive elastic body 120 is compressed by the inertial force when the chisel body 110 is struck with a piston so as to transmit the compressive force in the inner center direction of the chisel body 110 outside of the chisel body 110, more specifically is installed in the inserted state in the chisel body 110 so as to be inserted into the installation groove 112 . Here, the compressive elastic body 120 is compressed by the inertial force when the chisel body 110 is struck by the downward movement of the piston, and after a certain period of time, it is formed of soft rubber or synthetic resin having elasticity to elastically restore to its original state. can Therefore, when the compressed elastic body 120 is inserted into the chisel body 110 to be disposed in the installation groove portion 112, the installation groove portion 112 at the end of the chisel body 110 in a state in which it is spread by applying force to increase the inner diameter. ) to be inserted and disposed, when the force applied to increase the inner diameter is released, the chisel body 110 is coupled to the portion where the installation groove 112 is formed by its own elastic restoring force.

In addition, the compression elastic body 120 has a tube shape with both ends open so that it can be inserted and disposed on the outside of the chisel body 110 . At this time, the inner circumferential surface of the compressed elastic body 120 is formed such that the inner diameter size decreases from the upper side to the lower side so that the installation groove 112 of the chisel body 110 can be inserted to correspond to the formed outer surface portion. In addition, a plurality of contact projections 121 are formed to protrude to be inserted into the contact insertion groove 114 in which the installation groove portion 112 of the chisel body 110 is formed on the inner circumferential surface of the compressed elastic body 120, so that the compressed elastic body ( 120) and the elastic spring 130 during compression of the chisel body 110 in the inner central direction to be transmitted stably, as well as to the upper and lower sides of the installation groove 112 when the elastic restoration of the compression elastic body 120 is It prevents the compressive elastic body 120 from being separated from the installation groove 112 of the chisel body 110 while blocking the concentration of stress to the rim of the chisel body 110 .

Referring to FIG. 6 , a step-shaped multi-end portion 122 may be formed on the outer peripheral surface of the compressive elastic body 120 in a direction from the upper side to the lower side. The multi-end portion 122 applies the compressive force of the compressive elastic body 120 to the chisel body 110 regardless of the position from the upper side to the lower side of the compressive elastic body 120 while varying the elastic force for the compressive elastic body 120 from the upper side to the lower side. ) It enables stable dispersion transmission in the inward direction and enables stable fixation through the operator's grip or a separate jig means (not shown), while making it easy to insert and install on the outside of the chisel body 110 .

The elastic spring 130 is a portion that elastically supports the compression elastic body (120). In addition, when the elastic spring 130 moves the piston downward by hydraulic pressure and hits the chisel body 110 while the lower side of the piston comes into contact with the chisel body 110, it is compressed and returned to its original state after a certain period of time has elapsed. It is a part that can stably absorb the vibration generated from the blow of the chisel body 110 while being restored. That is, when the elastic spring 130 hits the chisel body 110 by the downward movement of the piston by hydraulic pressure, like the compressed elastic body 120 described above, the elastic spring 130 is compressed through an inertial force while compressing the chisel body 110 in the direction of the inner center of the compressive force. to absorb the vibration generated in the chisel body 110 through this. As such, when the elastic spring 130 hits the chisel body 110 with a piston, the compression duration and compression force of the compressed elastic body 120 compressed in the inner center direction of the chisel body 110 are increased, and through this, the chisel body By further increasing the compression force in the inner center direction of the chisel body 110, the vibration absorption rate for the chisel body 110 is increased, and the striking stress on the chisel body 110 is a straight line parallel to the axial direction of the chisel body 110. It transmits and increases the striking power.

In addition, the elastic spring 130 is in the compressed state after a certain period of time has elapsed, that is, when the magnitude of the inertial force becomes smaller than the magnitude of the elastic restoring force, the elastic spring 130 returns to its original state when the chisel body 110 is hit. Again, the vibration transmitted from the lower end to the upper end of the chisel body 110 can be stably absorbed while compression is made from the lower side to the upper side by the inertial force.

Such, the elastic spring 130 is compressed by the inertial force when the chisel body 110 is hit with a piston, and the chisel body ( The installation groove 112 of the 110) is installed in an inserted state inside the compressed elastic body 120 so as to be disposed in the formed portion. More preferably, the elastic spring 130 is formed in an integral state in a state where the compression elastic body 120 is placed on the mold when the compression elastic body 120 is molded by a mold so that it is coupled and disposed inside the compression elastic body 120 in an integral state. can be done Therefore, the elastic spring 130 is moved to be inserted into the installation groove 112 from the end of the chisel body 110 in a state in which the inner diameter is increased by applying a force to increase the inner diameter together with the compressed elastic body 120, and then the inner diameter is increased. When the applied force is released, coupling is made to the portion where the installation groove 112 of the chisel body 110 is formed by its own elastic restoring force and the elastic restoring force of the compressed elastic body 120 .

Here, the elastic spring 130 has a coil-type spring structure so that it can be inserted and disposed while enclosing the outer surface of the chisel body 110 . And, when the elastic spring 130 is inserted into the chisel body 110, the inner diameter of the chisel body 110 is formed to decrease from the upper side to the lower side. As such, the elastic spring 130 is formed to have a smaller inner diameter as it goes from the upper side to the lower side with respect to the axial direction of the chisel body 110, and through this, compression by the inertial force is uniformly and stably performed throughout from the upper end to the lower end. When the chisel body 110 is struck by the downward movement of the piston, the compression by the inertial force is stably made, and through this, the compression force is transmitted in the inner center direction of the chisel body 110 for the chisel body 110. Vibration absorption is stable.

In addition, as shown in Fig. 7, the upper and lower ends of the elastic spring 130 may be provided with a locking ring portion 131 for connecting and fixing the edge portion of the elastic spring 130. This, the engaging ring part 131 compresses the elastic spring 130 while preventing the upper and lower edge portions of the elastic spring 130 from expanding beyond a certain size when elastically restored from the compressed state of the elastic spring 130 . When formed integrally with the inside of the elastic body 120, it is possible to prevent the upper and lower edge portions of the elastic spring 130 from protruding upwards and downwards of the compression elastic body 120 . Here, the locking ring part 131 has a ring structure with one side open. And, a through hole 132 is formed in one side of the engaging ring portion 131, and when the elastic spring 130 is integrally molded inside the compression elastic body 120, the compression elastic body 120 is the engaging ring portion 131. It enables it to be molded in a stable state even in the position of

In this way, the compressive elastic body 120 and the elastic spring 130 are compressed by the inertial force when the chisel body 110 is hit by the downward movement of the piston by hydraulic pressure. While absorbing the vibration of the chisel body 110, the striking stress transmitted through the chisel body 110 is moved in a concentrated state in a straight line parallel to the axial direction of the chisel body 110, increasing the striking force against the crushed object make it In addition, the compression elastic body 120 and the elastic spring 130 are transmitted from the lower end to the upper end of the chisel body 110 through the compressive force due to the inertia generated in the chisel body 110 when the crushed object of the chisel body 110 is struck. As a result of reducing vibration, the distance between the outer surface of the chisel body 110 and the inner wall of the hydraulic breaker is stably maintained to prevent damage due to contact between the outer surface of the chisel body 110 and the inner wall of the hydraulic breaker In addition, a stable striking force is generated while the chisel body 110 maintains the position at which it is hit by the piston again afterward.

Here, since the specific gravity of the elastic spring 130 made of metal is higher than the specific gravity of the compression elastic body 120 and the elastic spring 130 having different specific gravity, that is, the elastic spring 130 having ductility is higher than that of the elastic spring 130. The kinetic energy also increases. Therefore, when the piston strikes the chisel body 110, the different compressive forces of the compressive elastic body 120 and the elastic spring 130 by the inertial force are transmitted to the inner center of the chisel body 110, while the chisel body 110. Vibration absorption is made stable.

In addition, the chisel for a hydraulic breaker according to an embodiment may include an auxiliary compression member (not shown) in the form of a ring having elasticity inserted outside the compression elastic body 120 . This auxiliary compression member prevents the compression elastic body 120 from bursting while supporting the outer circumferential surface of the compressive elastic body 120 when the compressive elastic body 120 and the elastic spring 130 are compressed, and the compressive elastic body 120 is a chisel. It makes it possible to maintain a stable fixed state so as not to depart from the body 110 . In addition, the auxiliary compression member stably transmits the compressive force in the inner direction of the chisel body 110 when the compression elastic body 120 and the elastic spring 130 are compressed while the chisel body 110 is hit by the piston. By reducing the vibration of the body 110, it is possible to stably increase the striking force against the crushed object. Here, the auxiliary compression member is provided on one side so that the compression elastic body 120 and the elastic spring 130 can be compressed and restored to their original state stably, as well as making it easy to install the compression elastic body 120 outside. It is preferable to have a ring structure in which an opening connecting the outside is formed.

Figure 8 (a) is a simulation result image of measuring the acceleration in the crushing part when the conventional chisel for a hydraulic breaker hits the iron plate, and Figure 8 (b) is the crushing when the chisel for the hydraulic breaker of the present invention hits the iron plate. This is an image of the simulation result obtained by measuring the acceleration in the part. In more detail, (a) and (b) of Fig. 8 shows the results of measuring the acceleration at the crushing part of the chisel when a 500t steel plate fixed with a 14ton excavator is struck with an inclination of 1 degree in the Z-axis. As shown in a), in the conventional chisel for a hydraulic breaker, a maximum acceleration value of 50,000 m/sec ² is measured, and the chisel 100 for a hydraulic breaker according to an embodiment of the present invention as shown in FIG. The maximum acceleration measured by the crushing unit 111 has an acceleration value reduced by about 40% to 30,000 m/sec ² . Through this, the chisel 100 for a hydraulic breaker according to an embodiment is a compressive elastic body 120 and elasticity at the time of striking. It can be seen that the compression force according to the inertia of the spring 130 is transmitted to the chisel body 110 to reduce vibration and noise.

As described above, the absorption action of vibrations generated when the piston of the chisel for a hydraulic breaker according to an embodiment configured as described above is struck by the piston and the shredding object is described as follows.

First, when the piston moves downward by hydraulic pressure, the lower end of the piston hits the upper end of the chisel body 110 .

At this time, the compressive elastic body 120 and the elastic spring 130 are compressed by the inertial force and apply a compressive force toward the inner center of the chisel body 110, thereby reducing the vibration of the chisel body 110.

In this way, when the striking stress is transmitted from the top to the bottom of the chisel body 110, the vibration of the chisel body 110 is reduced while the hitting stress moving from the top to the bottom of the chisel body 110 is the chisel body 110. As it is transmitted in a straight line parallel to the axial direction from the center of the

Conversely, when the impact repulsive force is transmitted from the upper end to the lower end of the chisel body 110 while the lower end of the chisel body 110 hits the crushed object, the compressive elastic body 120 and the elastic spring 130 are compressed by the inertial force. A compressive force is applied toward the inner center of the chisel body 110 , thereby reducing vibration of the chisel body 110 .

In this way, when the vibration of the chisel body 110 is reduced, even when the chisel body 110 moves upward by the impact repulsive force after hitting the crushed object, the distance between the outer surface of the chisel body 110 and the inner wall of the hydraulic breaker is stably maintained to keep the chisel body In addition to preventing damage due to the contact between the outer surface of the 110 and the inner wall of the hydraulic breaker, the chisel body 110 maintains the position hit by the piston again in the correct position, and then a stable striking force by the piston is generated. do.

As such, in the chisel for a hydraulic breaker of an embodiment, the compression elastic body 120 and the elastic spring 130 are inserted and installed in the installation groove 112 of the chisel body 110, and the chisel body 110 through the piston. When hitting, the compressive elastic body 120 and the elastic spring 130 are compressed by the inertial force, and the compressive force is transmitted to the inner center direction of the chisel body 110 to reduce the vibration of the chisel body 110. Bar noise reduction and to increase the striking force against the crushed object. In addition, the chisel body 110 transmits the compressive force to the inner center direction of the chisel body 110 while the compressive elastic body 120 and the elastic spring 130 are compressed by the inertial force in the impact repulsive force through the blow of the crushed object of the chisel body 110 . As the vibration reduction of 110 is made, a stable striking force is generated while reducing noise and maintaining the position where the chisel body 110 is hit by the piston again afterward at the correct position.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

Claims

In the chisel for a hydraulic breaker installed inside the hydraulic breaker and struck by a reciprocating piston,

A chisel body in the form of a shaft having a conical crushing portion provided at the lower end and a tapered installation groove portion formed on one side to decrease in diameter from the upper side to the lower side;

It is installed in the installation groove so as to be inserted and disposed on the outside of the chisel body, and when the piston hits the chisel body, it is compressed inwardly by inertia and has elasticity so as to absorb and reduce vibrations moving along the axial direction of the chisel body soft compressible elastomer; and

It is installed to be integrally molded and coupled to the inside of the compressive elastic body so that it can be inserted and disposed on the outside of the chisel body, while elastically supporting the compressive elastic body, and when the piston hits the chisel body, it is compressed in the inner direction of the chisel body by inertia A chisel for a hydraulic breaker including; a coil-type elastic spring having elasticity so that the compression elastic body is compressed in the inner direction of the chisel body and the absorption rate of vibration moving along the axial direction of the chisel body is increased.
The method according to claim 1,

The chisel for a hydraulic breaker is formed with a separation prevention end protruding in the direction of the installation groove so as to catch the upper and lower portions of the compressed elastic body on the edge of the chisel body located on the upper and lower sides of the installation groove.
The method according to claim 1 or 2,

A plurality of contact insertion grooves are formed in a portion of the chisel body at regular intervals in the vertical direction in which the installation groove portion is formed,

A chisel for a hydraulic breaker in which a contact protrusion protrudes to be inserted into the contact insertion groove on the inner circumferential surface of the compressed elastic body.
The method according to claim 1,

The size of the inner diameter of the elastic spring is a chisel for a hydraulic breaker formed to decrease from the top to the bottom of the chisel body.
4. The method according to claim 3,

The contact insertion groove is a chisel for a hydraulic breaker formed in a tapered shape so that the diameter of the chisel body decreases from the upper side to the lower side of the chisel body.