KR20120041996A

KR20120041996A - Breaker

Info

Publication number: KR20120041996A
Application number: KR1020100103443A
Authority: KR
Inventors: 황순승
Original assignee: (주)엠아이비
Priority date: 2010-10-22
Filing date: 2010-10-22
Publication date: 2012-05-03

Abstract

PURPOSE: A breaker with a fluid channel structure for increasing hitting power is provided to maximize impact transferred to a chisel by strongly descending a piston using auxiliary pressure generated from a third chamber. CONSTITUTION: A breaker with a fluid channel structure for increasing hitting power comprises first, second, and third chambers(72,74,76), a valve room(VR), first and second fluid channels(P1,P2), and a direction switching valve set(S). The first and second chambers form a space where touches the inner and outer surfaces of a piston(70) and a cylinder(10). The third chamber is formed between the first and second chambers. The valve room is installed outside the cylinder. High-pressure fluid is supplied from an external supply source to the valve room. The first flow channel connects the first chamber to the valve room, and the second flow channel selectively connects the valve room to the second chamber. The direction switching valve set is installed inside the valve room and ascends and descends the piston.

Description

Breaker with flow structure that can increase impact force {Breaker}

The present invention relates to a breaker having a flow path structure capable of increasing the striking force, the present invention relates to a breaker having a flow path structure capable of increasing the striking force, the chisel 30 and the chisel 30 is accommodated in a certain range A cylinder (10) having a chisel case (20) guiding to be stroked only therein, and a piston (70) coupled to and in communication with the chisel case (20) and accommodated on the coaxial to strike the chisel (20); In the breaker using the gas and hydraulic pressure which is fixed to the upper side of the cylinder 10 and provided with a gas chamber 50 which can be selectively expanded / contracted according to the lifting stroke of the piston 70 by nitrogen gas injection The first and second stepped surfaces 77 and 79 are formed along the longitudinal direction of the piston 70 so that the outer diameter of the piston 70 is changed by the stepped surfaces 77 and 79 so that the piston 70 and The third chamber 76 formed between the first and second chambers 72 and 74 having a predetermined space formed in a portion of the cylinder 10 in contact with the inner and outer circumferential surfaces thereof, and the first and second stepped surfaces 77 and 79. ), The valve chamber VR installed at the outside of the cylinder 10 and supplied with a high pressure fluid by an external source, and the first chamber 72 and the valve chamber VR communicate with each other. The first fluid passage (P1), the second fluid passage (P2) formed to selectively communicate with the valve chamber (VR) and the second chamber (74), and the bell It is installed inside the chamber (VR), the high-pressure fluid supplied by an external source is selectively supplied sequentially through the first fluid passage (P1) or the second fluid passage (P2) to the piston 70 It characterized in that it comprises a valve set for switching the direction (S) to enable the up / down of the drive, the second fluid passage (P2) is the piston 70 is located at the top dead center, It relates to a breaker having a flow path structure capable of increasing the impact force, characterized in that it is also formed in communication with the third chamber (76).

In general, a breaker (BREAKER) is exposed to the outside by hitting the head of the chisel (CHISEL) is a vertically reciprocating movement in a certain area by the power of the hydraulic or pneumatic acting intermittently act on the upper surface of the piston. It is a mechanism that allows the tip of the chisel to be crushed while the crushed object is in contact with it.

For example, as illustrated in FIG. 1, the breaker is filled with a compressive gas such as nitrogen gas and injected into the gas chamber 50 formed at the upper end of the piston 70 in the cylinder 10, and a chisel ( The head of 30 is mounted coaxially in contact with the piston 70, and the pressure state of the fluid supplied in this state is switched by the control valve installed in the valve chamber VR to lift the piston 70. In this case, the expansion force of the nitrogen gas in the gas chamber 50 is converted into hammering energy hitting the head of the chisel 30 through the piston 70, such as rock, concrete, etc., which are in contact with the front end thereof. And configured to crush the hardness crushed object.

Examples of such a breaker are well known, for example, Patent No. 10-0078639 ([A blow mechanism using gas and hydraulic pressure] as described in the prior art Patent Document 1) has a high-pressure fluid through-hole formed in the outer peripheral portion of the valve Without opening, the inlet of the passage connecting the rear annular chamber formed in the upper part of the piston and the through hole formed in the valve is directly opened and closed.When the piston reaches the top dead center while compressing the gas chamber, the outer circumferential surface of the spool (SPOOL) and the valve The high pressure fluid flows into the valve switching chamber formed by the inner circumferential surface, and the high pressure fluid directly pushes the spool in the valve to open the through hole formed in the valve, thereby immediately switching the rear annular chamber formed on the piston to the high pressure side. Configuration to maximize the energy and increase the hit energy at the same time It can control.

In addition, Patent No. 10-0343888 ([Breaker using gas and hydraulic pressure]) of Patent Document 2 in the following prior art document forms a step along the longitudinal direction of the piston to change the outer diameter of the piston so that the piston and the cylinder First, second, and third chambers having predetermined spaces formed at portions in contact with the inner and outer circumferential surfaces thereof; A first fluid passage formed in a part of a main surface of the cylinder so as to be in communication with the fluid inlet for supplying a high pressure fluid and to communicate with the first chamber; A valve chamber provided on an opposite end side in which the first fluid passage and the first chamber communicate; A second fluid passage formed on the main surface of the cylinder to selectively communicate the valve chamber and the second chamber; A valve set installed in the valve chamber to return the high pressure fluid supplied to the first chamber to the valve chamber and to supply the high pressure of the valve chamber to the second chamber through the plurality of through holes and the second fluid passage. Wow; A switching passage formed between the first and second fluid passages and selectively connected with the valve chamber through the valve set in accordance with the lifting and lowering operation of the piston; Disclosed is a configuration including an opening and closing passage formed adjacent to the switching passage and disposed to remove the residual pressure in the third chamber through the fluid through hole.

However, in these existing embodiments, at the moment when the operation of lowering the piston which has risen to the top dead center is started, in addition to utilizing the expansion force of the compressed gas in the gas chamber, as shown in FIG. By supplying a high-pressure fluid only to the second chamber 74 through P2), it is only a structure that can assist the piston descending process to increase the striking force of the piston. .

Patent Registration 10-0078639 Patent Registration 10-0343888

The present invention solves the problems of the existing inventions described above, by the configuration such that the high pressure supplied through the second fluid passage is applied not only to the second chamber but also to the third chamber at the moment when the operation of the piston is switched from rising to falling. In addition, the lower pressure of the piston is generated more efficiently and powerfully by the auxiliary pressure generated in the third chamber, so that the impact delivered to the chisel can be maximized to obtain a strong breaking force.

In order to achieve the above object, the present invention, the chisel (30), the chisel case (20) for receiving the chisel 30 and guided to be stroked only within a certain range, and is coupled to the chisel case 20 and communicated A cylinder (10) having a piston (70) received coaxially to strike the chisel (20); In the breaker using the gas and hydraulic pressure which is fixed to the upper side of the cylinder 10 and provided with a gas chamber 50 which can be selectively expanded / contracted according to the lifting stroke of the piston 70 by nitrogen gas injection The first and second stepped surfaces 77 and 79 are formed along the longitudinal direction of the piston 70 so that the outer diameter of the piston 70 is changed by the stepped surfaces 77 and 79 so that the piston 70 and The third chamber 76 formed between the first and second chambers 72 and 74 having a predetermined space formed in a portion of the cylinder 10 in contact with the inner and outer circumferential surfaces thereof, and the first and second stepped surfaces 77 and 79. ), The valve chamber VR installed at the outside of the cylinder 10 and supplied with a high pressure fluid by an external source, and the first chamber 72 and the valve chamber VR communicate with each other. The first fluid passage (P1), the second fluid passage (P2) formed to selectively communicate with the valve chamber (VR) and the second chamber (74), and the bell It is installed inside the chamber (VR), the high-pressure fluid supplied by an external source is selectively supplied sequentially through the first fluid passage (P1) or the second fluid passage (P2) to the piston 70 It characterized in that it comprises a valve set for switching the direction (S) to enable the up / down of the drive, the second fluid passage (P2) is the piston 70 is located at the top dead center, It is characterized in that it is formed so as to communicate with the third chamber (76).

In addition, the width A of the distal end portion P2 ′ of the second fluid passage P2 may be larger than the width B of the second step portion 79.

In addition, the width A of the distal end P2` of the second fluid passage P2 may be 1.2 to 3 times larger than the width B of the second stepped portion 79. .

According to the present invention, at the moment when the operation of the piston is switched from the ascending to the descending configuration, a simple improvement is made to the existing apparatus such that the high pressure supplied through the second fluid passage is applied not only to the second chamber but also to the third chamber. As a result, the lowering process of the piston is more efficiently and powerfully generated by the auxiliary pressure generated in the third chamber, thereby maximizing the impact delivered to the chisel, thereby obtaining a strong breaking force.

1 is an exemplary cross-sectional view of a breaker according to the prior art.
2a: Exemplary cross-sectional view when the piston of the breaker according to the prior art is at top dead center.
2b: Exemplary cross-sectional view when the piston of the breaker according to the prior art is at the bottom dead center.
FIG. 3A is a cross-sectional view when the piston of the breaker having a flow path structure capable of increasing the striking force according to an embodiment of the present invention is in a top dead center; FIG.
FIG. 3B is a cross-sectional view when the piston of the breaker having the flow path structure capable of increasing the striking force according to the embodiment of the present invention is located at the bottom dead center. FIG.
Figure 4 is an enlarged view of the main portion shown in a circle of Figure 3a showing the flow of the fluid when the piston of the breaker having a flow path structure capable of increasing the impact force in the top dead center according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a breaker having a flow path structure capable of increasing the impact force according to an embodiment of the present invention will be described in detail. First, it should be noted that, in the drawings, the same components or parts are denoted by the same reference numerals whenever possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

The present invention is characterized in that it comprises a cylinder 10, a chisel case 20, a chisel 30, a gas chamber 50, a piston 70 as shown in Figure 3a and 3b. As shown in FIGS. 3A and 3B, the cylinder 10 and the chisel case 20 include a chisel case 20 and a cylinder 10 fixedly connected to the chisel case 20. . The cylinder 10 is a space in which the piston 70 striking the chisel 30 is slid by being interviewed and coaxial with the chisel case 20. On the other hand, the gas head 40 is fixed to one end of the cylinder 10 is generally finished. The chisel 30 is fixed inside the chisel case 20 so as to be reciprocated. The chisel 30 is partially inserted into the chisel case 20 and the rest of the chisel case 20 is exposed to the outside of the chisel case 20. It is fixed. The chisel 30 is a rod (ROD) of the tip is in direct contact with the crushing object to crush it, the upper end is provided to be in contact with the piston 70 built in the cylinder 10 can be pressed out . Therefore, the chisel 30 which is pressed down by the striking of the piston 70 is capable of reciprocating along its longitudinal direction.

Meanwhile, as shown in FIG. 3A, the first and second stepped surfaces 77 and 79 are formed along the longitudinal direction of the piston 70 to form the piston 70 by the stepped surfaces 77 and 79. By changing the outer diameter, the first and second chambers 72 and 74 having a predetermined space are formed at portions in contact with the inner and outer peripheral surfaces of the piston 70 and the cylinder 10. Meanwhile, a third chamber 76 is formed between the first and second stepped surfaces 77 and 79 as shown in FIG. 3A.

In addition, as shown in FIG. 3A, a valve chamber VR to which a high pressure fluid is supplied by an external supply source is formed outside the cylinder 10. As shown in FIG. 3A, a valve set S for changing direction is installed in the valve chamber VR. On the other hand, the first fluid passage (P1) is formed as shown in Figure 3a so that the first chamber 72 and the valve chamber (VR) communicate with each other, the valve chamber (VR) and the second chamber A second fluid passage P2 is formed to selectively communicate 74. By the operation of the direction change valve set S installed in the valve chamber VR, the high-pressure fluid supplied by an external supply source is supplied to the first fluid passage P1 or the second fluid passage P2. It is selectively supplied sequentially through) to enable the up / down driving of the piston (70).

The configuration of the valve chamber (VR) and the direction change valve set (S) to enable such driving is very much as disclosed in a number of breaker related inventions in addition to the embodiments disclosed in Patent Documents 1 and 2 of the prior art document. Various embodiments are possible. Since the configuration of the valve chamber (VR) and the directional valve set (S) is a level of technology widely known and practiced in the field of the present invention, a detailed description thereof will be omitted.

On the other hand, the second fluid passage (P2), as shown in Figures 3a and 4, when the piston 70 is located in the top dead center, it is formed so as to communicate with the third chamber (76). do. By the second fluid passage (P2) of this configuration, in the existing breaker, when the piston 70 starts the lowering operation at the top dead center as shown in Figure 2a of the compressed gas in the gas chamber 50 In addition to the pressure, the high-pressure fluid supplied through the second fluid passage P2 simply pressurizes only the second chamber 74, whereas in the present invention, the second pressure is added to the pressure of the gas compressed in the gas chamber 50. The high pressure fluid supplied through the fluid passage P2 presses the third chamber 76 together with the second chamber 74. Therefore, when the direction of movement is switched from the rising operation to the lowering operation, and at the point of time when the greatest driving force is required, the piston 70 may be more strongly supplied with the driving force by the high pressure fluid than the conventional breaker. It is possible to increase the striking force by lowering the movement more quickly and powerfully.

In this case, the width A of the end portion P2 ′ of the second fluid passage P2 is larger than the width B of the second step portion 79 as shown in FIG. 4. Preferably, more preferably, the width A of the end portion P2 ′ of the second fluid passage P2 is formed to be 1.2 to 3 times larger than the width B of the second step portion 79. At the time when the direction of movement is changed from the rising operation to the lowering operation, a larger driving force is generated, and the valve chamber VR and the direction are made as in the embodiment disclosed in Patent Document 2 of the prior art document. The second fluid, if the descending to some extent progressed even when another fluid passage (opening passage (PA), opening and closing passage (PB), etc. of Patent Document 2) is formed for the operation of the switching valve set (S). By preventing the passage P2 and the third chamber 76 from communicating with each other, interference by operation can be prevented. It is desirable to.

In the above, the best embodiments have been disclosed in the drawings and specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

10: cylinder 20: chisel case
30: Chisel
50: gas chamber
70: piston
72,74,76: chamber
100: Breaker
VR: Valve chamber S: Directional valve set
P1: first fluid passage P2: second fluid passage

Claims

Chisel 30;
A chisel case 20 which accommodates the chisel 30 and guides the stroke to be stroked only within a predetermined range; A cylinder (10) coupled to and in communication with the chisel case (20) and having a piston (70) coaxially received to strike the chisel (20); In the breaker using the gas and hydraulic pressure which is fixed to the upper side of the cylinder 10 and provided with a gas chamber 50 which can be selectively expanded / contracted according to the lifting stroke of the piston 70 by nitrogen gas injection ,

The piston 70 and the cylinder are formed by forming the first and second stepped surfaces 77 and 79 along the longitudinal direction of the piston 70 such that the outer diameter of the piston 70 is changed by the stepped surfaces 77 and 79. First and second chambers 72 and 74 having predetermined spaces formed at portions in contact with the inner and outer circumferential surfaces of 10;
A third chamber 76 formed between the first and second stepped surfaces 77 and 79;
A valve chamber (VR) installed outside the cylinder (10) and supplied with a high pressure fluid by an external source;
A first fluid passage (P1) formed so that the first chamber (72) and the valve chamber (VR) communicate with each other;
A second fluid passage (P2) formed to selectively communicate the valve chamber (VR) with the second chamber (74);
Installed in the valve chamber (VR), the high pressure fluid supplied by an external supply source is selectively supplied sequentially through the first fluid passage (P1) or the second fluid passage (P2) to the piston ( Turn valve set (S) to enable the up / down driving of the 70; Characterized in that comprises a,

The second fluid passage (P2) is a breaker having a flow path structure capable of increasing the striking force, characterized in that when the piston (70) is located at the top dead center, it is also formed to communicate with the third chamber (76).

The method according to claim 1,
The width A of the distal end P2` of the second fluid passage P2 is formed to be larger than the width B of the second stepped portion 79. Breaker equipped.

The method according to claim 2,
The width A of the distal end portion P2 ′ of the second fluid passage P2 is 1.2 to 3 times larger than the width B of the second step portion 79 to increase the striking force. Breaker having a flow path structure is possible.