CN210265324U

CN210265324U - Piston guide structure of hydraulic breaking hammer

Info

Publication number: CN210265324U
Application number: CN201920440348.0U
Authority: CN
Inventors: 林雨才
Original assignee: Taizhou Belite Machinery Co ltd
Current assignee: Taizhou Belite Machinery Co ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-04-07
Anticipated expiration: 2029-04-02

Abstract

The utility model provides a piston guide structure of hydraulic breaking hammer belongs to hydraulic equipment technical field. It has solved the easy strain phenomenon of current well cylinder body and the problem that the life of well cylinder body is low. The piston guide structure of the hydraulic breaking hammer is characterized in that a front working cavity and a rear working cavity are formed in the inner peripheral surface of a middle cylinder body, a front boss and a rear boss are arranged in the middle of the outer peripheral surface of a piston, a guide sleeve is arranged in the middle cylinder body, the front end of the guide sleeve extends to the front end portion of the middle cylinder body, the front end face of the guide sleeve is located on the front side of the front working cavity, the rear end of the guide sleeve extends to the rear end portion of the middle cylinder body, the rear end face of the guide sleeve is located on the front side of the rear working cavity, and the piston is arranged in the guide sleeve in a. This structure avoids the piston direct with the inner wall contact of well cylinder body tip, after the uide bushing takes place wearing and tearing, with in the cylinder body the uide bushing change can for well cylinder body can used repeatedly, has prolonged the life and the cost of maintenance of well cylinder body greatly.

Description

Piston guide structure of hydraulic breaking hammer

Technical Field

The utility model belongs to the technical field of hydraulic equipment, a piston guide structure of hydraulic crushing hammer, especially a hydraulic crushing hammer is related to.

Background

The hydraulic breaking hammer is a machine tool capable of converting hydraulic energy into mechanical energy so as to apply work to the outside, is mainly used for breaking, dismantling, excavating hard layers and the like, and is usually installed on an excavator, a loader or a power station for use.

At present, the chinese patent network discloses a novel hydraulic nitrogen combined action quartering hammer [ grant No.: CN201695429U, including preceding cylinder body, the drill rod of setting in preceding cylinder body, the back cylinder body of storage nitrogen gas, well cylinder body and setting up piston and the switching-over valve of control oil circuit conversion in well cylinder body, set up preceding working chamber and back working chamber between piston and the well cylinder body, set up the oil circuit passageway on preceding working chamber and the back working chamber, preceding working chamber and main oil circuit communicate with each other, keep normal high pressure state, back working chamber is the oil extraction when the piston return stroke, is the low pressure state, the oil intake when the piston stroke, is the high pressure state. In the piston return stage, the piston compresses nitrogen upwards under the action of high-pressure oil in the front working cavity, the hydraulic oil in the rear working cavity flows back to a hydraulic oil tank through a reversing valve, when the piston rises to a certain position, the reversing valve reverses, and the high-pressure oil enters the rear working cavity; in the piston stroke stage, as the action area of the hydraulic oil in the rear working cavity of the piston is larger than that of the front working cavity, the downward force is larger than the upward force, and the piston moves downward under the combined action of hydraulic pressure and nitrogen pressure and strikes the drill rod. The middle part of the piston is provided with two annular bosses at intervals from front to back, when the piston descends, high-pressure oil in the back working cavity acts on the back end surface of the back boss to push the piston to strike, when the piston ascends, the high-pressure oil in the front working cavity acts on the front end surface of the front boss to push the piston to reset, during the reciprocating motion of the piston, the front end and the back end of the middle cylinder body play a role in supporting and guiding the piston, the bosses also play a role in guiding to ensure that the piston has better centering property, a gap between the outer peripheral surface of the piston and the inner peripheral surface of the front end and the back end of the middle cylinder body is generally several wires, during the reciprocating motion of the piston, absolute centering motion cannot be kept, the outer peripheral surface of the piston easily rubs against the inner walls of the front end and the back end of the middle cylinder body, so that the inner walls of the front end and the back end of the middle, the piston easily takes place the centering nature reduction that the vibrations of certain degree lead to the piston for follow-up piston in-process that rises, the outer peripheral face of boss or the outer fringe of terminal surface take place the scraping and strain with the inner wall of well cylinder body, need change whole well cylinder body during the maintenance, because the volume of this kind of large-scale mechanical equipment's cylinder body is huge, cause the cost of maintenance of quartering hammer huge, on the other hand, because the oil circuit design of quartering hammer and other auxiliary components all arrange on well cylinder body, need dismantle numerous auxiliary components from condemned well cylinder body when changing well cylinder body, then install again on new well cylinder body, cause the maintenance very inconvenient.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a piston guide structure of hydraulic breaking hammer, the utility model aims to solve the technical problem that: how to reduce the pulling phenomenon of the piston and the middle cylinder body and improve the service life of the middle cylinder body.

The purpose of the utility model can be realized by the following technical proposal:

a piston guide structure of a hydraulic breaking hammer comprises a front cylinder body, a middle cylinder body, a rear cylinder body, a piston and a drill rod arranged in the front cylinder body, the front cylinder body, the middle cylinder body and the rear cylinder body are sequentially connected end to end, a front working cavity and a rear working cavity are formed in the inner peripheral surface of the middle cylinder body, a front boss and a rear boss are arranged in the middle of the outer peripheral surface of the piston, it is characterized in that a guide sleeve is arranged in the middle cylinder body, the front end of the guide sleeve extends to the front end part of the middle cylinder body, the front end surface of the guide sleeve is positioned at the front side of the front working cavity, the rear end of the guide sleeve extends to the rear end part of the middle cylinder body, the rear end surface of the guide sleeve is positioned at the front side of the rear working cavity, the piston is arranged in the guide sleeve in a sliding manner, the front boss and the rear boss both slide back and forth along the inner circumferential surface of the guide sleeve, the front end of the guide sleeve is provided with a thickened portion, and the front end portion of the piston is slidably arranged in the thickened portion.

After the guide sleeve is arranged in the middle cylinder body, the piston is arranged in the guide sleeve in a sliding manner, the guide sleeve isolates the piston from the middle cylinder body, the front boss and the rear boss both slide back and forth along the inner circumferential surface of the guide sleeve, the front end part of the piston is arranged in the thickened part in a sliding manner, the structure ensures that the piston has better centering property in the reciprocating movement process, the structure prevents the piston from directly contacting with the inner wall of the end part of the middle cylinder body, the piston rubs with the guide sleeve in the reciprocating movement process, when the guide sleeve is worn, the guide sleeve in the middle cylinder body is replaced, so that the middle cylinder body can be repeatedly used, the service life of the middle cylinder body is greatly prolonged, and because the middle cylinder body has huge volume and high price, the maintenance cost of tens of thousands or hundreds of thousands is frequently generated in the mode of replacing the middle cylinder body in the prior art, and the abrasion of the structure is generated on the guide sleeve, the guide sleeve is low in price, the manufacturing cost is generally thousands, after the structure is adopted, the maintenance cost is reduced to one tenth or one tenth of the original maintenance cost, the maintenance cost of the breaking hammer is greatly reduced, and remarkable economic benefit is generated.

In the above piston guide structure of the hydraulic breaking hammer, the inner peripheral surface of the front end of the middle cylinder body is provided with an annular positioning boss, the front end surface of the guide sleeve abuts against the positioning boss, the rear end of the middle cylinder body is internally provided with a piston sleeve, the front end surface of the piston sleeve abuts against the rear end surface of the guide sleeve, the inner peripheral surface of the front end of the rear cylinder body is provided with a limiting step, the limiting step abuts against the rear end surface of the piston sleeve, and the rear end of the piston is slidably arranged in the piston sleeve. During assembly, the guide sleeve is inserted into the middle cylinder body from the rear end of the middle cylinder body, so that the front end face of the guide sleeve abuts against the positioning boss, the piston sleeve is plugged into the rear end of the middle cylinder body, the front end face of the piston sleeve abuts against the rear end face of the guide sleeve, then the front end face of the rear cylinder body abuts against the rear end face of the middle cylinder body, the front cylinder body, the middle cylinder body and the rear cylinder body sequentially abut against one another end to end and are mutually tensioned through fasteners, the end faces and the end faces abut against one another closely, the limiting step on the rear cylinder body abuts against the rear end face of the piston sleeve, so that the guide sleeve and the piston sleeve are pressed between the positioning boss and the limiting step, the guide sleeve and the piston sleeve cannot axially move in the reciprocating movement process of the piston, and the guide sleeve and the piston sleeve are firmly positioned in the middle.

In the piston guide structure of the hydraulic breaking hammer, the front end surface of the piston sleeve extends forwards to form an annular extension part, the front end surface of the extension part abuts against the rear end surface of the guide sleeve, a rear oil cavity is arranged between the rear end surface of the rear boss and the piston sleeve, and the extension part is provided with a first oil inlet hole communicated with the rear working cavity and the rear oil cavity. In the structure, high-pressure oil in the rear working cavity enters the rear oil cavity through the first oil inlet hole, and then acts on the rear end face of the rear boss to push the piston to descend to strike the drill rod.

In the above piston guiding structure of the hydraulic breaking hammer, the first oil inlet hole has a plurality of first oil inlet holes, and the plurality of first oil inlet holes are arranged at intervals along the circumferential direction of the extending portion. In this structure, the high-pressure oil in the back working chamber enters into the back oil pocket through a plurality of inlet port one, the high-pressure oil enters into the back oil pocket from a plurality of directions in, the oil feed efficiency of back oil pocket has been improved, and the oil pressure in the back oil pocket is even, it leads to the interior local oil pressure of back oil pocket too high to have avoided the haplopore oil feed, the too high centering nature that can influence the piston of local oil pressure in the back oil pocket, the centering nature of piston can be showing to the oil feed mode of this structure improvement, reduce the wearing and tearing of piston and uide bushing, the life-span of piston and uide bushing is improved.

In the above piston guide structure of the hydraulic breaking hammer, a first seal ring is arranged between the outer peripheral surface of the piston sleeve and the inner wall of the middle cylinder body. The structure prevents high-pressure oil in the rear working cavity from leaking out from a gap between the outer peripheral surface of the piston sleeve and the inner wall of the middle cylinder body.

In the above piston guide structure of the hydraulic breaker, a guide belt and a second seal ring are disposed between the inner circumferential surface of the piston sleeve and the outer circumferential surface of the piston, and the second seal ring has at least two seal rings disposed respectively on the front and rear sides of the guide belt. The guide belt of the structure plays a role in guiding the reciprocating movement of the piston, the centering performance of the piston is improved, and the sealing ring II is arranged to prevent high-pressure oil in the rear oil cavity from leaking from a gap between the inner peripheral surface of the piston sleeve and the outer peripheral surface of the piston.

In the piston guide structure of the hydraulic breaking hammer, the front oil cavity is formed between the positioning step and the front end face of the front boss, and the guide sleeve is provided with a second oil inlet hole for communicating the front working cavity with the front oil cavity. In the structure, high-pressure oil in the front working cavity enters the front oil cavity through the second oil inlet hole, and then acts on the front end face of the front boss to push the piston to ascend and reset.

In the piston guide structure of the hydraulic breaking hammer, the oil inlet holes II are provided with a plurality of oil inlet holes II, and the oil inlet holes II are arranged at intervals along the circumferential direction of the guide sleeve. In this structure, the high-pressure oil in the preceding working chamber enters into in the preceding oil pocket through a plurality of inlet port two, the high-pressure oil enters into in the preceding oil pocket from a plurality of directions, the oil feed efficiency of preceding oil pocket has been improved, and the oil pressure in the preceding oil pocket is even, it leads to preceding oil pocket interior local oil pressure too high to have avoided the haplopore oil feed, the too high centering nature that can influence the piston of local oil pressure in the preceding oil pocket, the centering nature of piston can be showing to the oil feed mode of this structure improvement, reduce the wearing and tearing of piston and uide bushing, the life-span of piston and uide bushing is improved.

In the piston guide structure of the hydraulic breaking hammer, a third sealing ring is arranged between the outer peripheral surface of the guide sleeve and the inner wall of the middle cylinder body, and the third sealing ring is provided with at least two sealing rings which are respectively arranged at the front side and the rear side of the front working cavity. The structure prevents high-pressure oil in the front working cavity from leaking out from a gap between the outer peripheral surface of the guide sleeve and the inner wall of the middle cylinder body.

Compared with the prior art, the utility model discloses a piston guide structure of hydraulic crushing hammer has following advantage: this structure avoids the piston direct with the inner wall contact of well cylinder body tip, after the uide bushing takes place wearing and tearing, with in the cylinder body the uide bushing change can for well cylinder body enough used repeatedly has prolonged the life of well cylinder body greatly, adopts this structural configuration back, cost of maintenance falls to original ten minutes or ten minutes, greatly reduced the cost of maintenance of quartering hammer, produced apparent economic benefits.

Drawings

Fig. 1 is a schematic diagram of the ascending cross-sectional structure of the piston of the present invention.

Fig. 2 is an enlarged schematic view of a portion a in fig. 1.

Fig. 3 is a schematic view of the cross-sectional structure of the piston descending according to the present invention.

Fig. 4 is a schematic perspective view of the piston of the present invention.

In the figure, 1, a front cylinder body; 2. a middle cylinder body; 2a, a front working cavity; 2b, a rear working cavity; 2c, positioning a boss; 3. a rear cylinder body; 31. a limiting step; 4. a drill rod; 5. a piston; 51. a front boss; 52. A rear boss; 6. a guide sleeve; 61. a front end face; 62. a rear end face; 63. thickening part; 64. an oil inlet hole II; 7. a piston sleeve; 71. an extension portion; 71a and a first oil inlet hole; 8. a rear oil chamber; 9. a first sealing ring; 10. a guide belt; 11. a second sealing ring; 12. a front oil chamber; 13. and a third sealing ring.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, 3 and 4, the piston guiding structure of the hydraulic breaking hammer comprises a front cylinder 1, a middle cylinder 2, a rear cylinder 3, a piston 5 and a drill rod 4 arranged on the front cylinder 1, wherein the front cylinder 1, the middle cylinder 2 and the rear cylinder 3 are sequentially connected end to end, the inner circumferential surface of the middle cylinder 2 is provided with a front working chamber 2a and a rear working chamber 2b, the middle part of the outer circumferential surface of the piston 5 is provided with a front boss 51 and a rear boss 52, a guide sleeve 6 is arranged in the middle cylinder 2, the front end of the guide sleeve 6 extends to the front end part of the middle cylinder 2, the front end of the guide sleeve 6 is positioned at the front side of the front working chamber 2a, the rear end of the guide sleeve 6 extends to the rear end part of the middle cylinder 2, the rear end surface 62 of the guide sleeve 6 is positioned at the front side of the rear working chamber 2b, the piston 5 is slidably arranged in the guide sleeve 6, the front boss 51 and the rear boss 52 slide along the inner circumferential surface of the guide sleeve 6, the front, the front end portion of the piston 5 is slidably disposed in the thickened portion 63. After the guide sleeve 6 is arranged in the middle cylinder body 2, the piston 5 is arranged in the guide sleeve 6 in a sliding mode, the piston 5 is isolated from the middle cylinder body 2 by the guide sleeve 6, the front boss 51 and the rear boss 52 both slide back and forth along the inner circumferential surface of the guide sleeve 6, the front end portion of the piston 5 is arranged in the thickened portion 63 in a sliding mode, the piston 5 has better centering performance in the reciprocating moving process due to the structure, the piston 5 is prevented from being directly contacted with the inner wall of the end portion of the middle cylinder body 2 due to the structure, the piston 5 rubs with the guide sleeve 6 in the reciprocating moving process, after the guide sleeve 6 is worn, the guide sleeve 6 in the middle cylinder body 2 can be replaced, the middle cylinder body 2 can be used repeatedly, and the service life of the middle cylinder body 2 is greatly prolonged.

As shown in fig. 1 and 3, the front oil chamber 12 is disposed between the positioning boss 2c and the front end surface of the front boss 51, the guide sleeve 6 is provided with a plurality of oil inlet holes 64 communicating the front working chamber 2a with the front oil chamber 12, the oil inlet holes 64 are arranged at intervals along the circumferential direction of the guide sleeve 6, the high-pressure oil in the front working chamber 2a enters the front oil chamber 12 through the oil inlet holes 64, the high-pressure oil enters the front oil chamber 12 from multiple directions, the oil inlet efficiency of the front oil chamber 12 is improved, the oil pressure in the front oil chamber 12 is uniform, the centering performance of the piston 5 can be obviously improved, the abrasion between the piston 5 and the guide sleeve 6 is reduced, and the service lives of the piston 5 and the guide sleeve 6 are prolonged. And a third sealing ring 13 is arranged between the outer peripheral surface of the guide sleeve 6 and the inner wall of the middle cylinder body 2, and the third sealing ring 13 is provided with at least two sealing rings which are respectively arranged at the front side and the rear side of the front working cavity 2a, so that high-pressure oil in the front working cavity 12 is prevented from leaking from a gap between the outer peripheral surface of the guide sleeve 6 and the inner wall of the middle cylinder body 2.

As shown in fig. 1 and 2, the inner peripheral surface of the front end of the middle cylinder 2 has a positioning boss 2c in an annular shape, the front end surface 61 of the guide sleeve 6 abuts against the positioning boss 2c, the rear end of the middle cylinder 2 is provided with a piston sleeve 7, the front end surface of the piston sleeve 7 abuts against the rear end surface 62 of the guide sleeve 6, the inner peripheral surface of the front end of the rear cylinder 3 has a limit step 31, the limit step 31 abuts against the rear end surface of the piston sleeve 7, and the rear end of the piston 5 is slidably disposed in the piston sleeve 7. When the structure is assembled, the guide sleeve 6 is firstly inserted into the middle cylinder body 2 from the rear end of the middle cylinder body 2, so that the front end surface 61 of the guide sleeve 6 is abutted against the positioning boss 2c, the piston sleeve 7 is plugged into the rear end of the middle cylinder body 2, the front end surface of the piston sleeve 7 is abutted against the rear end surface 62 of the guide sleeve 6, then the front end surface of the rear cylinder body 3 is abutted against the rear end surface of the middle cylinder body 2, the front cylinder body 1, the middle cylinder body 2 and the rear cylinder body 3 are abutted against one another end to end in sequence and are tightened with one another through fasteners, the end surfaces are abutted against one another closely, the limit step 31 on the rear cylinder body 3 is abutted against the rear end surface of the piston sleeve 7, so that the guide sleeve 6 and the piston sleeve 7 are pressed between the positioning boss 2c and the limit step 31, and during the reciprocating movement of the piston 5, the guide sleeve 6 and the piston sleeve 7 can not axially move, and the guide sleeve 6 and the piston sleeve 7 are firmly positioned in the middle cylinder body 2.

As shown in fig. 2, the front end surface of the piston sleeve 7 extends backwards to form an annular extension portion 71, the front end surface of the extension portion 71 abuts against the rear end surface 62 of the guide sleeve 6, a rear oil chamber 8 is formed between the rear end surface of the rear boss 52 and the piston sleeve 7, an oil inlet hole one 71a communicating the rear working chamber 2b and the rear oil chamber 8 is formed in the extension portion 71, the oil inlet hole one 71a is provided with a plurality of oil inlet holes one 71a, and the oil inlet holes one 71a are arranged at intervals along the circumferential direction of the extension portion 71. High-pressure oil in the rear working cavity 2b enters the rear oil cavity 8 through the oil inlet holes 71a, and the high-pressure oil enters the rear oil cavity 8 from multiple directions, so that the oil inlet efficiency of the rear oil cavity 8 is improved, the oil pressure in the rear oil cavity 8 is uniform, the centering performance of the piston 5 is obviously improved, the abrasion between the piston 5 and the guide sleeve 6 is reduced, and the service lives of the piston 5 and the guide sleeve 6 are prolonged.

As shown in fig. 2, a first seal ring 9 is arranged between the outer peripheral surface of the piston sleeve 7 and the inner wall of the middle cylinder body 2 to prevent high-pressure oil in the rear working chamber 2b from leaking out of a gap between the outer peripheral surface of the piston sleeve 7 and the inner wall of the middle cylinder body 2; a guide belt 10 and a second sealing ring 11 are arranged between the inner circumferential surface of the piston sleeve 7 and the outer circumferential surface of the piston 5, the second sealing rings 11 are at least two and are respectively arranged on the front side and the rear side of the guide belt 10, the guide belt 10 plays a role of guiding the reciprocating movement of the piston 5, the centering performance of the piston 5 is improved, and the second sealing rings 11 are arranged to prevent high-pressure oil in the rear oil cavity 8 from leaking from a gap between the inner circumferential surface of the piston sleeve 7 and the outer circumferential surface of the piston 5.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A piston guide structure of a hydraulic breaking hammer comprises a front cylinder body (1), a middle cylinder body (2), a rear cylinder body (3), a piston (5) and a drill rod (4) arranged on the front cylinder body (1), wherein the front cylinder body (1), the middle cylinder body (2) and the rear cylinder body (3) are sequentially connected end to end, a front working cavity (2a) and a rear working cavity (2b) are formed in the inner circumferential surface of the middle cylinder body (2), a front boss (51) and a rear boss (52) are arranged in the middle of the outer circumferential surface of the piston (5), the piston guide structure is characterized in that a guide sleeve (6) is arranged in the middle cylinder body (2), the front end of the guide sleeve (6) extends to the front end part of the middle cylinder body (2), the front end face (61) of the guide sleeve (6) is located on the front side of the front working cavity (2a), and the rear end of the guide sleeve (6) extends to the rear end part of the middle cylinder body (, the rear end face (62) of the guide sleeve (6) is located on the front side of the rear working cavity (2b), the piston (5) is arranged in the guide sleeve (6) in a sliding mode, the front boss (51) and the rear boss (52) both slide back and forth along the inner circumferential surface of the guide sleeve (6), the front end of the guide sleeve (6) is provided with a thickened portion (63), and the front end portion of the piston (5) is arranged in the thickened portion (63) in a sliding mode.

2. The piston guide structure of the hydraulic breaking hammer according to claim 1, wherein the inner peripheral surface of the front end of the middle cylinder (2) is provided with an annular positioning boss (2c), the front end surface (61) of the guide sleeve (6) abuts against the positioning boss (2c), the rear end of the middle cylinder (2) is internally provided with a piston sleeve (7), the front end surface of the piston sleeve (7) abuts against the rear end surface (62) of the guide sleeve (6), the inner peripheral surface of the front end of the rear cylinder (3) is provided with a limiting step (31), the limiting step (31) abuts against the rear end surface of the piston sleeve (7), and the rear end of the piston (5) is slidably arranged in the piston sleeve (7).

3. The piston guide structure of a hydraulic breaking hammer as claimed in claim 2, wherein the front end surface of the piston sleeve (7) extends forwards to form an annular extension part (71), the front end surface of the extension part (71) abuts against the rear end surface (62) of the guide sleeve (6), a rear oil chamber (8) is arranged between the rear end surface of the rear boss (52) and the piston sleeve (7), and the extension part (71) is provided with a first oil inlet hole (71a) which is communicated with the rear working chamber (2b) and the rear oil chamber (8).

4. The piston guide structure of a hydraulic breaker hammer according to claim 3, wherein the oil inlet hole one (71a) has a plurality of oil inlet holes one (71a) arranged at intervals in a circumferential direction of the extension portion (71).

5. A piston guide structure of a hydraulic breaking hammer according to any one of claims 2-4, characterized in that a first seal ring (9) is arranged between the outer peripheral surface of the piston sleeve (7) and the inner wall of the middle cylinder body (2).

6. The piston guide structure of a hydraulic breaker according to any one of claims 2 to 4 wherein a guide belt (10) and a second seal ring (11) are provided between the inner peripheral surface of the piston sleeve (7) and the outer peripheral surface of the piston (5), and the second seal ring (11) has at least two and is provided on the front and rear sides of the guide belt (10).

7. The piston guide structure of a hydraulic breaking hammer as claimed in claim 2, wherein a front oil chamber (12) is arranged between the positioning boss (2c) and the front end surface of the front boss (51), and an oil inlet hole II (64) for communicating the front working chamber (2a) with the front oil chamber (12) is formed in the guide sleeve (6).

8. The piston guide structure of a hydraulic breaking hammer according to claim 7, wherein the oil inlet hole two (64) is provided with a plurality of oil inlet holes two (64), and the plurality of oil inlet holes two (64) are arranged at intervals along the circumferential direction of the guide sleeve (6).

9. The piston guide structure of a hydraulic breaker according to any one of claims 1 to 4 and 7 to 8, wherein a third seal ring (13) is provided between the outer peripheral surface of the guide sleeve (6) and the inner wall of the middle cylinder (2), and the third seal ring (13) has at least two and is provided on the front and rear sides of the front working chamber (2a), respectively.