WO2017159955A1

WO2017159955A1 - Hydraulic breaker

Info

Publication number: WO2017159955A1
Application number: PCT/KR2016/013059
Authority: WO
Inventors: 박정열
Original assignee: (주)대동이엔지
Priority date: 2016-03-15
Filing date: 2016-11-14
Publication date: 2017-09-21
Also published as: RU2018136135A; KR101804790B1; KR20160108255A

Abstract

The present invention relates to a hydraulic breaker and, more specifically, to a hydraulic breaker capable of reducing the impact applied to a tool pin by a chisel when a no-load strike is generated. The hydraulic breaker of the present invention comprises: a front head coupled to a cylinder in which a piston is provided so as to enable reciprocation; the chisel slidably provided to the front head, and to be hit by the piston; a thrust ring provided so as to be slidable in the longitudinal direction of the front head, and restricting the chisel from entering the side of the piston; and a chisel repulsion buffering unit having at least one elastic body provided between the thrust ring and an upper bush, which is provided inside the cylinder or the front head, so as to buffer the impact applied inside the piston and the front head when the chisel, which is lifted by the repulsive force applied to the chisel from an object to be crushed, and the thrust ring come into contact with each other.

Description

Hydraulic breaker

The present invention relates to a hydraulic breaker, and more particularly, to a hydraulic breaker that can reduce the impact generated in the front head during the shredding object shredding, and can reduce the impact received by the tool pin by the chisel when a ball strike occurs.

In general, the breaker mounted on the excavator is operated by the hydraulic pressure of the excavator, such a breaker is a piston that is mounted inside the main body is mounted on the front head to hit the chisel to crush the object to break such as rock .

The conventional structure of the hydraulic breaker is a front head provided with a cylinder constituting the body of the hydraulic breaker, a piston which is installed to reciprocate up and down inside the cylinder, and a blow chamber connected to the lower part of the cylinder and to which the piston is applied. And a chisel installed in the front head so that the upper end is located in the impact chamber, and a chisel for crushing the crushing object, and a valve selectively supplying hydraulic pressure to the lower cylinder and the upper cylinder to reciprocate the piston.

Chisel is a configuration for transferring the kinetic energy of the piston to the impact energy to the fracture object. If the lower end of the piston hits the top of the chisel while the piston is lowered from the top dead center, which is the maximum rising position, and the bottom of the piston hits the top of the chisel, the chisel transmits the impact energy, which is the impact force received from the piston, to the fracture object. Done. At this time, the chisel is movable by a limited distance to the front head and is supported by the tool pin so as not to be separated from the front head. When the hydraulic breaker is pressed while the chisel is in contact with the crushing object by the operation of the excavator, the chisel is pushed up and the piston is opened to the position where the high pressure can be received by opening the high pressure port.

In this way, by mechanically applying an external force to the hydraulic breaker and pressing the chisel in contact with the crushing object, the movement of the chisel to a position that can be hit by the reciprocating piston is referred to as 'preload' of the hydraulic breaker.

Here, when the piston moves from the up position to the striking position while the chisel is not preloaded, that is, when the chisel is caught by the tool pin or when the shredding object is completed, the chisel is lowered due to its own weight. Not hitting directly, the inner wall of the cylinder or the front head directly hits the piston and the cylinder will cause excessive stress and impact. This phenomenon is called no-load strikes or idle blows. If the operator does not stop the operation of the hydraulic breaker after the crushing object is completed, the hydraulic breaker is continuously operated in the idle state. Typically, the operator recognizes that the shredding of the shredding object is completely finished and the struck is generated during the time it takes to stop the operation of the hydraulic breaker.

The ball strikes the front head to impact the front head and assembly parts such as stop pins, thrust rings, and tool pins mounted inside the front head and the front head, as well as the service life of the hydraulic breaker.

Korean Patent Publication No. 10-1518811 discloses a hydraulic breaker for detecting breakage of the chisel pin (tool pin) for supporting the chisel. However, these hydraulic breakers do not have a function to reduce the impact of the chisel pin when a ball strike occurs.

On the other hand, when the chisel crushes the shredding object by using the force striking the piston, a repulsive force is generated that is opposed to the direction in which the piston strikes the chisel from the shredding object until the shredding object is broken. This repulsive force raises the chisel and strikes the inside of the front head and the piston. In particular, due to the collision of the impact force of the piston and the repulsive force of the crushing object, the vibration and noise are further increased, causing a problem that the durability of the hydraulic breaker may be significantly reduced.

The problem to be solved of the present invention is to reduce the internal impact due to the chisel raised by the repulsive force generated from the shredding object during shredding of the shredding object, the shredding of the shredding object is completed, the ball is started to be generated as the chisel is lowered by its own weight By providing a hydraulic brake that can reduce the impact on the front head and tool pins.

Hydraulic breaker of the present invention for solving the above technical problem and the front head is coupled to the cylinder in which the piston is reciprocally installed;

A chisel slidably mounted to the front head and hitting the piston;

A thrust ring slidably installed in the longitudinal direction of the front head to restrict the chisel from entering the piston;

Installed between the thrust ring and the upper bush installed in the cylinder or the front head, the chisel and the thrust ring, which are raised by the repulsive force received by the chisel from the crushing object, are applied to the piston and the inside of the front head when contacted. Characterized in that it comprises a chisel rebound shock absorbing unit having at least one elastic member to cushion the impact.

In the present invention, the chisel repulsion shock absorbing unit is installed in the front head and the plurality of elastic member support grooves in the circumferential direction on the lower surface of the upper bush having an inner diameter reducing portion that guides the piston and defines the lowered position of the piston Is formed, one side of the spring which is an elastic member is supported in the elastic member support groove,

The other side of each spring is supported on a flange portion extending radially from the chisel guide portion of the thrust ring so that the thrust ring is elastically biased downward.

Hydraulic breaker according to the present invention for solving the technical problem is a front head coupled to the cylinder in which the piston is reciprocally installed, the chisel is slidably installed on the front head and hit the piston, the front head First and second thrust rings that are slidably installed in the longitudinal direction and restrict the entry of the chisel to the piston side, and a first non-metallic ring absorbing a shock installed between the first thrust ring and the lower surface of the upper bush; And the piston and the thrust ring, which are installed between the first and second thrust members, are installed between the first and second thrust members and are lifted by the repulsive force received by the chisel from the crushing object. Chisel with at least one elastic member to cushion shocks inside the front head And in that it includes to the buffer unit to its features.

In the present invention, a plurality of first and second support grooves are formed on the surfaces of the first and second thrust rings that face each other at equal intervals, and the elastic unit is installed in the first and second support grooves.

The elastic unit may be formed of a coil spring installed in the first and second support grooves, and the elastic unit is installed in the first and second support grooves, and includes a plurality of plate springs and the plate springs. It may be provided with a support plate spring support member.

In addition, the hydraulic breaker of the present invention increases the resistance received by the lubricant moved along the direction of movement of the chisel when the chisel is moved up and down to reduce the impact received by the chisel to reduce the impact of the tool pin by the chisel. It is further provided.

The air shock reduction unit is guided into the engaging groove extending in the up and down direction and introduced inward to both sides of the outer circumferential surface of the chisel located in the front head and the jam state is maintained when the chisel flows up and down in the front head Tool pins installed in the front head, the inner circumferential surface of the front head and the lubricant to be filled in the inner space of the site where the tool pin is installed, and is installed in the front head so as to be located outside the chisel where the locking groove is formed And a shock reducing member for increasing the resistance received by the lubricant moving along the moving direction of the chisel when the chisel is moved up and down, thereby reducing the impact of the tool pin by the chisel when the chisel is generated.

The impact reducing member is formed to penetrate up and down with a diameter larger than that of the chisel, so that the chisel penetrates so that the inner circumferential surface is spaced from the chisel and the outer circumferential surface is in contact with the inner circumferential surface of the front head. A body portion having first and second through-holes formed at one side and the other side of the position corresponding to the tool pin, and protruding from the inner circumferential surface of the body portion in contact with the outer circumferential surface of the chisel and extending in the circumferential direction And a lubricant movement inhibiting portion which suppresses the lubricant from being moved in the moving direction of the chisel.

The hydraulic breaker of the present invention can reduce the impact applied to the piston and the front head because the repulsive force generated during the shredding object shredding to raise the chisel is reduced by the chilsch repulsion buffer unit. In addition, since the resistance to the lubricant to move along the direction of movement of the chisel is increased by the impact reducing member, the impact on the tool pins by the chisel is reduced, thereby reducing damage to the front head and tool pins. Has the advantage to improve.

1 is a partially separated perspective view of a hydraulic breaker according to the present invention.

2 is a partial cross-sectional view of the hydraulic breaker of FIG.

Figure 3 is an exploded perspective view showing an extract of the chisel repulsion buffer unit shown in Figure 1,

Figure 4 is an exploded perspective view showing another embodiment of the hydraulic breaker according to the present invention.

5 is a partial cross-sectional view of the hydraulic breaker of FIG.

Figure 6 is an exploded perspective view showing an extract of the chisel repulsion buffer unit shown in Figure 2,

7 is a partial ablation perspective view showing an exclusion shock reduction unit according to the present invention,

8 is a partial cross-sectional view of the hydraulic breaker shown in FIG.

9 is a partial cross-sectional view of the hydraulic breaker shown in FIG.

The present invention relates to a hydraulic breaker capable of preventing the impact caused by the struck, one embodiment is shown in Figures 1 to 6.

Referring to the drawings, the hydraulic breaker 1 includes a cylinder 20 in which the piston 10 is reciprocally embedded, a front head 30 installed at one end of the cylinder 20, and a piston 10. And a chisel 40 which is hit and transmits the striking force to the crushing object, and a tool pin 60 which is installed at the front head 30 to support the chisel 40 so as to be movable, and the piston is raised due to the raised chisel. And a chisel rebound shock absorbing unit (90) having at least one elastic member to cushion the shock applied to the inside of the front head, and the impact received by the front head (30) and the tool pin (60) when a ball strike occurs. It is provided with an impact reduction unit 120 including a shock reduction member 130 that can be.

Referring to the hydraulic breaker configured as described above for each component as follows.

The cylinder 20 is a hydraulic cylinder for reciprocating the piston 10 by using hydraulic pressure, and a valve (not shown) is provided at one side to change the direction of hydraulic pressure. In addition, the cylinder 20 is provided with an accumulator 50 for temporarily storing hydraulic oil to be used as a kinetic energy source in the lower side adjacent to the valve. At this time, the piston 10 reciprocates to protrude with respect to one end of the cylinder 20.

The front head 30 is coupled to one end of the cylinder 20, which is connected in parallel to the direction of movement of the piston (10). The front head 30 is provided with a striking chamber 31 that can accommodate the lower portion of the piston 10 protruding with respect to one end of the cylinder 20 during the reciprocating movement of the piston 10 at the top and the striking chamber 31 Below the chisel 40 is installed to be movable in a direction parallel to the reciprocating direction of the piston. At this time, the top of the chisel 40 is installed to be located in the striking chamber.

Referring to FIG. 1, the front head 30 has a cross-sectional shape of the tool pin 60 so that the tool pin 60 to be described later can be inserted into the front head 30 in a direction orthogonal to the longitudinal direction of the front head 30. Correspondingly, a plurality of tool pin insertion holes 33 are formed. The plurality of tool pin insertion holes 33 are formed side by side in the horizontal direction and are formed longer than the extended length of the tool pin 60, respectively.

In addition, the front head 30 is orthogonal to the longitudinal direction of the front head 30 and penetratingly formed in a direction orthogonal to the extending direction of the tool pin insertion hole 33, the coupling hole 35 is in communication with the tool pin insertion hole (33) ) Is formed. Coupling hole 35 is coupled to the stop pin 70 for preventing the separation of the tool pin 60 inserted into the tool pin insertion hole 33. The coupling hole 35 is formed in plural so that the stop pin 70 can penetrate through one side and the other side of the tool pin insertion hole 33, respectively. At this time, the stop pin 70 is formed relatively long so as to pass through a plurality of tool pin insertion hole 33 formed side by side.

The chisel 40 has an upper portion positioned in the front head 30 or the striking chamber 31 to hit the piston 10 descending to the lower portion of the striking chamber 31, and is caused by the impact of the piston 10. It protrudes from the end of the front head 30 so that the object can be broken by the impact force.

The chisel 40 is brought into contact with the crushing object and presses the crushing object while raising the upper portion of the front head 30, which is a position where it can be hit by the piston 10, or transmitting the impact force due to the impact of the piston 10 to the crushing object. It is slidably installed in the front head 30 so that it can be lowered.

The chisel 40 has engaging grooves 41 extending in the up and down directions and being inwardly formed on both sides of the outer peripheral surface of the upper part located in the front head 30, respectively. The locking groove 41 is preferably formed to extend longer in the longitudinal direction of the front head 30 than the width of the tool pin 60 to be described later so as not to interfere when moving by the impact force when the piston 10 is hit. .

The tool pin 60 is installed in the front head 30 so as to be positioned between the inner circumferential surface of the front head 30 and the engaging groove 41 of the chisel 40 so that the chisel 40 is placed in the front head 30 within the front head 30. Support the chisel 40 so as to be in a locking state that can flow in the longitudinal direction of the). The tool pin 60 is inserted into the tool pin insertion hole 33, which is installed in the coupling hole 35 and fixed by the stop pin 70 passing through one side and the other side of the tool pin insertion hole 33. Tool pin 60 is located in each of the engaging grooves 41 formed on both sides of the chisel 40, the chisel 40 is the front head while contacting the upper and lower ends of the engaging groove 41 according to the movement direction of the chisel 40 It prevents the departure from the (30) and serves to limit the stroke distance when the chisel (40) flows.

The chisel repulsion buffer unit 90 is installed inside the front head when the chisel 40 hits the piston 10 to impact the crushing object, with the repulsive force received by the chisel 40 by the crushed object not broken. The chisel 40 serves to cushion the shock applied to the piston 10 and the front head 30 while moving in the direction of the piston 10.

1 to 2 and 3, the chisel repulsion buffer unit 90 includes an upper bush 91, a lower bush 93, a thrust ring 94, and an elastic body 97.

The upper bush 91 wraps around the outer circumferential surface of the piston 10 accommodated above the front head 30 during the reciprocating movement of the piston 10, and is fixed to the striking chamber 31 of the front head 30. The upper bush 91 is formed in a tubular shape through which a piston 10 enters an upper portion and a chisel 40 enters a lower portion so that upper and lower portions of the upper bush 91 penetrate. The upper bushing 91 has a first inner diameter reducing portion 91a having a reduced inner diameter so as to limit an entry distance of the piston 10 into the front head at the lower portion thereof.

The lower bush 93 is positioned in the upper outer side of the chisel 40 in a tubular shape through which the upper and lower penetrates, and is fixed to the front head 30 to be spaced a predetermined distance from the upper bush 91. The lower bush 93 guides the traveling direction of the chisel 40 and prevents the detachment of the thrust ring 94 to be described later.

Referring to FIG. 3, the thrust ring 94 is inserted into the end side of the chisel 40 and is installed to be movable in the longitudinal direction of the front head 30 between the upper bush 91 and the lower bush 93. . The thrust ring 94 has an inner diameter smaller than that of the lower bush 93 so that the thrust ring 94 is inserted into the reduced diameter of the end of the chisel 40, thereby limiting the entrance to the upper portion of the front head 30. The thrust ring 94 has a ring shape penetrating in the vertical direction and has a step shape having a smaller outer diameter than the lower portion thereof, that is, a flange portion is formed to form an elastic seat portion 94a in contact with the lower portion of the elastic body 97 to be described later. do. In addition, the thrust ring 94 has a second inner diameter reducing portion 94b which limits the entry of the chisel 40 by reducing the inner diameter toward the upper side thereof. The second inner diameter reduction portion 94b is in contact with the stepped portion 42 formed by decreasing the diameter of the end side of the chisel 40.

The elastic body 97 is installed in the circumferential direction on the lower portion of the upper bush 91 to be located between the upper bush 91 and the thrust ring 94. The elastic body 97 may be provided in plural so as to be supported in the grooves 92 formed in the lower portion of the upper bushing 91, and may be formed of a coil spring. The elastic body 97 is applied to the piston 10 and the front head 30 when the chisel 40 moves in the direction of the piston 10 due to the repulsive force received by the chisel 40 from the crushing object. It can cushion the impact.

5 to 6 show another embodiment of the chisel repulsion buffer unit according to the present invention. The same reference numerals as in the embodiment indicate the same components.

Referring to the drawings, the chisel rebound shock absorbing unit 100 of the hydraulic breaker is installed in the front header 30 coupled to the cylinder 20 to guide the upper bush 91 and the lower member 93 of the piston 10. Between the first thrust ring 101 and the second thrust ring 102 is provided to restrict the chisel 40 from entering the piston 10 side. The second thrust ring 102 has an upper portion relatively smaller than a diameter portion of the lower member 93 and is positioned on the upper side of the chisel 40 and is coupled to an upper end portion of the chisel having a relatively small diameter.

In addition, a non-metal ring 105, which is an elastic body that absorbs a shock installed between the first thrust ring 101 and the lower surface of the upper bushing 91, is installed. The non-metal ring 105 may be made of a synthetic resin material, preferably made of PE material. In addition, it is installed between the first and second thrust rings 101 and 102, and is installed between the first and second thrust rings 101 and 102 to be lifted by the repulsive force received by the chisel from the crushing object. At least one elastic unit 110 is provided to cushion the shock applied to the piston and the front head when the chisel and the thrust ring contact each other. The elastic unit 110 is formed with a plurality of first and

second support grooves

112 and 113 at equal intervals on the surfaces of the first and second thrust rings 101 and 102 opposed to each other, and the first The two

support grooves

112 and 113 are provided with a plurality of dish springs 114 and 115 and a dish spring support member 116 for supporting the dish springs 114 and 115. The plate spring support member 116 is provided with protrusions 117 into which the plate springs 114 and 115 are fitted.

The elastic unit 110 is not limited to the above embodiments, and may be any structure that can elastically defend the first and second thrust rings 101 and 102 in the vertical direction. For example, the first and second thrust rings 101 and 102 may be formed of coil springs installed in a circumferential direction. Support grooves may be formed in a portion where the plurality of coil springs arranged along the circumferential direction between the first and second thrust rings 101 and 102 to support the coil springs.

Meanwhile, the lubricant is filled in the empty space formed between the front head 30 and the chisel 40. Lubricant is to prevent abrasion generated in the front head 30, the tool pin 60, and the chisel 40 by the impact or friction caused by the movement of the chisel (40). The lubricant 81 is supplied into the front head 30 through the nipple 80 for supplying the lubricant mounted on the front head 30. As the lubricant 81, a general grease is used.

The impact reduction unit 120 is installed on the outside of the chisel 40, the locking groove 41 is formed, by increasing the resistance received by the lubricant 81 is moved in accordance with the direction of movement of the chisel 40 It is provided with a shock absorbing member 130 to reduce the impact received by the tool pin 60 and the front head 30 by the chisel 40 when the ball is generated. Referring to FIGS. 1 and 2 and 5 to 9, the ball impact shock absorbing member 130 includes a body portion 140 and a lubricant moving restraint portion 150.

The body 131 has a cylindrical shape formed to penetrate up and down larger than the diameter of the chisel 40 so that the chisel 40 is penetrated so that the inner circumferential surface thereof is spaced apart from the chisel 40. Body portion 131 is installed so that the outer circumferential surface is in contact with the inner circumferential surface of the front head 30 of the position corresponding to the locking groove 41 of the chisel 40, so that the tool pin 60 can contact the locking groove 41 First and second through

parts

132 and 133 are formed on one side and the other side of the position corresponding to the tool pin.

The first and second through-

holes

131 and 132 are formed to correspond to each other, respectively, through the inner circumferential surface of the body portion 131 is formed in the shape of a long hole extending a predetermined distance in the circumferential direction. Therefore, as shown in FIGS. 7 and 8, one side of the tool pin 60 contacting the catching groove 41 of the chisel 40 is positioned inside the body 131. In addition, the upper and lower ends of both sides of the body portion 131 on which the first and

second penetration parts

132 and 133 are formed are positioned above and below the upper and lower ends of the tool pin 60.

In addition, the body portion 131 is in communication with the lubricant supply nipple 80 installed in the cylinder 20 to supply the lubricant 81 into the front head 30 on one side, the lubricant inside the body portion 131. A lubricant supply passage 82 is formed to allow 81 to be supplied.

The lubricant movement suppressing part 150 is formed on the inner circumferential surface of the body part 131 between the first and second through

parts

132 and 133. The lubricant movement inhibiting part 150 protrudes from the inner circumferential surface of the body portion 131 to the outer circumferential surface of the chisel 40 in the direction of the chisel 40 and extends in the circumferential direction.

The lubricant movement inhibiting part 150 suppresses the movement of the lubricant 81 along the moving direction of the chisel 40 to the empty space between the outer circumferential surface of the portion where the engaging groove 4 of the chisel is not formed and the front head. Accordingly, the lubricant movement inhibitor 150 serves to increase the resistance received by the lubricant 81 by inducing the lubricant 80 to be moved only to a portion where the tool pin 60 and the engaging groove 41 are in contact with each other.

The lubricant movement suppressing part 150 includes a first movement restraining jaw 151 and a second movement restraining jaw 152. The first movement restraining jaw 151 protrudes from the inner circumferential surface of the body 131 in the direction in which the chisel 40 is located, protrudes upwardly toward the end and extends in the circumferential direction to contact the outer circumferential surface of the chisel. The second movement restrained jaw 152 is formed below the first movement restrained jaw 151. The second movement restraining jaw 152 protrudes from the inner circumferential surface of the body portion 131 in the direction in which the chisel 40 is located, protrudes downwardly toward the end and extends in the circumferential direction to contact the outer circumferential surface of the chisel.

In addition, the lubricant movement inhibiting part 150 has a front head for each end of the first and second

movement inhibiting jaws

151 and 152 between the first movement restraining jaw 151 and the second movement restraining jaw 152. An inlet groove 153 is formed which is drawn in the direction of 30 and extends in the circumferential direction.

Unlike the illustrated illustration, the lubricant movement suppressing part may protrude to contact the outer circumferential surface of the chisel at the inner circumferential surface of the body portion, but may be widened toward the end. That is, the lubricant movement inhibiting part may be applied such that the first movement restraining jaw 151 and the second movement restraining jaw 152 are integrally formed without the inlet groove 153 being formed.

The operation of the hydraulic breaker 1 having the same structure as described above will be described. 2, 5 and 7, 8, while the chisel 40 is in contact with the crushing object to pressurize the crushing object, the chisel 40 is a blow chamber 31 in a position that can be hit by the piston 10 Will rise to the bottom of. In the state in which the chisel 40 is raised, the piston 10 descends from the top dead center to the bottom dead center by the flow of hydraulic pressure in the cylinder 20, and strikes the top of the chisel 40. The impact received by the chisel 40 by the impact of the piston 10 is transmitted to the crushing object is to be crushed object.

The hydraulic breaker 1 according to the present invention receives a repulsive force opposite to the direction in which the piston 10 strikes the chisel from the crushing object until the crushing object is crushed during crushing of the crushing object. The chisel 40 is lifted by this repulsive force and is in contact with the chisel 40 and the thrust ring 94. At this time, the chisel 40 is restricted to enter by the second inner diameter reduction portion 94b of the thrust ring 94 and the chisel 40 rises while the elastic body 97 positioned above the thrust ring 94 is contracted. Slows down. Accordingly, the impact applied to the piston 10 in contact with the chisel 40 may be reduced.

In the embodiment of FIGS. 4 to 6, the chisel 40 is raised to raise the second thrust ring 102 or the piston 10 is lowered to lower the first thrust ring 101. Since the plate springs 114 and 115 supported by the support member 116 are installed between the thrust rings 101 and 102, the impact generated by the contact between the chisel 40 and the piston 10 can be reduced. It becomes possible.

On the other hand, when the crushing object is in the crushing complete state, the chisel (40) begins to descend by its own weight, and the batter is generated until the operator stops the piston operation to recognize the crushing completion. The chisel 40 can be moved in the vertical direction, which is the longitudinal direction of the front head 30 due to the ball strike, and the lubricant 80 filled between the front head 30 and the chisel 40 according to the moving direction of the chisel. Will move.

Lubricating material 81 is a large space (a) of the empty space between the front head 30 and the chisel 40 along the direction of movement of the chisel 40 to a narrow space (b) inside the impact reducing member 130 The movement is prevented from moving to the portion where the locking groove 41 of the chisel 40 is not formed by the lubricant movement inhibiting unit 150 so as to be moved only between the tool pin 60 and the locking groove 41. Accordingly, the resistance received by the lubricant 81 increases, and thus the movement speed of the chisel 40 is slowed down by decreasing the movement speed of the lubricant 81. As the moving speed of the chisel is slowed, the impact applied to the tool pin 60 in contact with the chisel 40 and the front head 30 coupled to the tool pin 60 is reduced, and the chisel repulsion buffer unit as described above. The impact is further reduced.

The hydraulic breaker 1 according to the present invention described above is generated during the shredding of the shredding object, so that the repulsive force for raising the chisel 40 is reduced by the chilsch

repulsion buffer unit

90, 100, and thus the piston 10 and the front head 30. ) Can reduce the impact applied to the inside, and the resistance received by the lubricant 81 to move along the moving direction of the chisel 40 when the ball is generated by the impact reducing member 130 increases the tool pin by the chisel 40 By reducing the impact applied to the (60) it is possible to reduce the damage to the front head 30 and the tool pin 60 has the advantage to improve the durability.

Although the hydraulic breaker according to the present invention described above has been described with reference to an example shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments may be made by those skilled in the art. Will understand. Therefore, the true scope of the technical protection of the present invention will be defined by the technical spirit of the appended claims.

Claims

A front head coupled to a cylinder in which the piston is reciprocally installed,

A chisel slidably mounted to the front head and hitting the piston;

A thrust ring slidably installed in the longitudinal direction of the front head to restrict the chisel from entering the piston;

Installed between the thrust ring and the upper bush installed in the cylinder or the front head, the chisel and the thrust ring, which are raised by the repulsive force received by the chisel from the crushing object, are applied to the piston and the inside of the front head when contacted. Hydraulic breaker, characterized in that provided with a chisel rebound buffer unit having at least one elastic body to cushion the impact.
The method of claim 1,

The chisel repulsion buffer unit is installed in the front head and a plurality of support grooves in the circumferential direction on the lower surface of the upper bush having an inner diameter reducing portion for guiding the piston and defining the lowering position of the piston, is formed in each support groove The back side of the spring which is an elastic body is supported,

Hydraulic breaker, characterized in that the other side of each spring is supported on the upper surface of the flange portion extending radially from the chisel guide portion of the thrust ring so that the thrust ring is elastically biased downward.
A front head coupled to a cylinder in which the piston is reciprocally installed,

A chisel slidably mounted to the front head and hitting the piston;

First and second thrust rings which are slidably installed in the longitudinal direction of the front head to restrict the chisel from entering the piston side, and a first absorbing force installed between the first thrust ring and the lower surface of the upper bush; Non-metal ring,

It is installed between the first and second thrust, and installed between the first and second thrust members, the piston and the front when the chisel and the thrust ring are raised by the repulsive force received by the chisel from the crushing object. A hydraulic breaker, comprising: a chisel rebound buffer unit having at least one elastic unit to cushion shocks applied to the inside of the head.
The method of claim 3, wherein

A hydraulic breaker, characterized in that a plurality of first and second support grooves are formed at equal intervals on the surfaces of the first and second thrust rings at equal intervals, and the elastic unit is installed in the first and second support grooves.
The method of claim 4, wherein

The elastic unit is a coil spring installed in the first and second support grooves

Hydraulic breaker, characterized in that made.
The method of claim 4, wherein

The elastic unit is installed in the first and second support grooves, a hydraulic breaker, characterized in that it comprises a plurality of dish springs and a dish spring support member for supporting the dish springs.
The method of claim 1,

When the chisel is moved up and down, the hydraulic shock reduction unit further increases the resistance received by the lubricant moved along the moving direction of the chisel to reduce the impact received by the tool pin by the chisel when the ball is generated Blake.
The method of claim 7, wherein

The air shock reduction unit is guided into the engaging groove extending in the up and down direction and introduced inward to both sides of the outer circumferential surface of the chisel located in the front head and the jam state is maintained when the chisel flows up and down in the front head Tool pins installed in the front head so that

Lubricant is filled in the inner circumference of the front head and the inner space of the site where the tool pin is installed,

The tool pin is installed on the front head so as to be located outside the chisel where the catching groove is formed so that the chisel is increased in resistance when the lubricant is moved along the moving direction of the chisel at the same time. Hydraulic breaker comprising a; shock reduction member for reducing the impact received.
The method of claim 8,

The impact reducing member is

The chisel penetrates up and down with a diameter larger than the chisel, and the chisel penetrates so that the inner circumferential surface is spaced apart from the chisel, and the outer circumferential surface is installed to contact the inner circumferential surface of the front head. A body portion having first and second through portions formed on one side and the other side of the position,

Protruding from the inner circumferential surface of the body portion in the chisel direction to contact the outer circumferential surface of the chisel and extending in the circumferential direction so as to have a lubricating agent movement restraining portion for inhibiting the lubricating material from moving along the direction of movement of the chisel. Hydraulic breaker.
The method of claim 9, wherein the lubricant movement inhibitor

A first movement restraining jaw protruding upward from the inner circumferential surface of the body and extending in the circumferential direction and contacting the outer circumferential surface of the chisel;

It is formed below the first movement inhibiting jaw and protrudes in the chisel direction inclined downward from the inner circumferential surface of the body portion and is formed in the circumferential direction has a second movement suppressing jaw in contact with the outer circumferential surface of the chisel,

An inlet groove is formed between the first movement restraint jaw and the second movement restraint jaw, the inlet groove extending in the front head direction and extending in the circumferential direction with respect to each end of the first and second movement restraint jaws. Hydraulic breaker.