Hydraulic breaker

Abstract

This utility model discloses a hydraulic breaker, comprising an upper cylinder, a middle cylinder, a lower cylinder, a piston, and a chisel. The upper end of the middle cylinder is connected to the lower end of the upper cylinder; the lower cylinder is connected to the lower end of the middle cylinder; the piston passes through the upper, middle, and lower cylinders and can move axially up and down; the upper end of the piston is located in the upper cylinder and forms a sealed air chamber with the inner wall of the upper cylinder, the air chamber being filled with high-pressure gas; the middle part of the piston is housed in the middle cylinder and forms a sealed hydraulic oil chamber with the inner wall of the middle cylinder; the chisel is housed in the lower cylinder; wherein, the middle cylinder is provided with a control unit connected to the hydraulic oil chamber, and an oil inlet chamber and an oil outlet chamber selectively connected to the control unit, the control unit being used to control the entry and exit of hydraulic oil into the hydraulic oil chamber to drive the piston to move up and down. This hydraulic breaker can more accurately control the impact force, and has a simple structure and higher reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of rock crushing equipment, specifically relating to a hydraulic breaker. Background Technology

[0002] With the explosive growth in demand for green mining, mining methods are also rapidly evolving. Hydraulic breakers, due to their precise energy delivery characteristics, have become an indispensable technological node for energy conservation and emission reduction. Existing hydraulic breakers are mainly pneumatic-hydraulic hybrid breakers, which use high-pressure hydraulic oil to push the piston upwards and compress high-pressure gas in the upper cylinder to store energy. Then, under the combined action of hydraulic pressure and the high-pressure gas in the middle cylinder, the piston begins its impact stroke. The piston repeatedly impacts the end face of the chisel in the lower cylinder, breaking the target object contacted by the other end of the chisel. However, the coordination of hydraulic and pneumatic pressure in existing breakers is not precise enough, making it difficult to accurately control the piston's impact force. Furthermore, the hydraulic or pneumatic circuit structure of existing breakers is very complex, resulting in low reliability.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a hydraulic breaker that can more accurately control the impact force, and has a simple structure and higher reliability.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides the following technical solution: A hydraulic breaker includes an upper cylinder, a middle cylinder, a lower cylinder, a piston, and a chisel. The upper end of the middle cylinder is connected to the lower end of the upper cylinder; the lower cylinder is connected to the lower end of the middle cylinder; the piston passes through the upper, middle, and lower cylinders and can move up and down axially; the upper end of the piston is located in the upper cylinder and forms a sealed air chamber with the inner wall of the upper cylinder, the air chamber being used to fill with high-pressure gas; the middle part of the piston is housed in the middle cylinder and forms a sealed hydraulic oil chamber with the inner wall of the middle cylinder; the chisel is housed in the lower cylinder; wherein, the middle cylinder is provided with a control unit connected to the hydraulic oil chamber, and an oil inlet chamber and an oil outlet chamber selectively connected to the control unit, the control unit being used to control the hydraulic oil entering the hydraulic oil chamber and exiting from the hydraulic oil chamber to drive the piston to move up and down.

[0006] In one or more embodiments of this utility model, the control unit includes a hydraulic oil passage, a main valve sleeve, and a main valve core. One end of the hydraulic oil passage communicates with the hydraulic oil chamber; the main valve sleeve is fixedly disposed at the other end of the hydraulic oil passage, and the main valve sleeve is provided with a first communicating hole communicating with the oil inlet chamber and a second communicating hole communicating with the oil outlet chamber; the main valve core is movably disposed within the main valve sleeve, such that the first communicating hole and the second communicating hole selectively communicate with the hydraulic oil passage.

[0007] In one or more embodiments of this utility model, a main valve sleeve end cap is provided at the other end of the hydraulic oil passage. The main valve sleeve end cap is used to connect to an external control device to control the movement of the main valve core.

[0008] In one or more embodiments of this utility model, a flow passage is provided on the main valve core, the flow passage is connected to the hydraulic oil channel, and the main valve core has a first working position and a second working position in the main valve sleeve. In the first working position, the flow passage is aligned with the first connecting hole, and the hydraulic oil can enter the hydraulic oil channel from the oil inlet chamber; in the second working position, the flow passage is aligned with the second connecting hole, and the hydraulic oil can enter the oil outlet chamber from the hydraulic oil channel.

[0009] In one or more embodiments of this utility model, an oil inlet hole is provided between the hydraulic oil channel and the oil inlet chamber, and an oil outlet hole is provided between the hydraulic oil channel and the oil outlet chamber. The first connecting hole is connected to the oil inlet hole, and the second connecting hole is connected to the oil outlet hole.

[0010] In one or more embodiments of this utility model, one end of the oil inlet chamber is connected to an external oil supply device, and an energy storage piston is provided in the oil inlet chamber. The oil inlet chamber is divided into a closed oil inlet chamber and a high-pressure gas chamber by the energy storage piston. When the external oil supply device adds hydraulic oil to the oil inlet chamber, the energy storage piston moves and compresses the high-pressure gas in the high-pressure gas chamber. When the hydraulic oil in the oil inlet chamber enters the control unit, the high-pressure gas expands and pushes the energy storage piston.

[0011] In one or more embodiments of this utility model, an oil storage piston is provided in the oil discharge chamber. The oil discharge chamber is divided into an oil storage chamber and a low-pressure gas chamber by the oil storage piston. When the hydraulic oil in the control unit is discharged into the oil storage chamber, the oil storage piston moves and compresses the low-pressure gas in the low-pressure gas chamber. When the oil storage chamber discharges the hydraulic oil to an external oil storage device, the low-pressure gas expands and pushes the oil storage piston.

[0012] In one or more embodiments of this utility model, a piston sealing sleeve is interference-fitted between the upper part of the middle cylinder and the piston to prevent communication between the upper cylinder and the middle cylinder.

[0013] In one or more embodiments of this utility model, a dust seal and a sealing ring are provided between the lower part of the cylinder body and the piston to seal and clean the piston.

[0014] In one or more embodiments of this utility model, an upper cylinder sleeve and a lower cylinder sleeve are sequentially arranged between the lower cylinder body and the chisel to support the chisel.

[0015] Compared with existing technologies, the hydraulic breaker of this invention effectively controls piston movement to achieve the corresponding crushing effect by setting up a control unit and an oil inlet and outlet chambers connected to the control unit. By controlling the time the main valve core is at the first connecting hole of the main valve sleeve, the amount of hydraulic oil entering the hydraulic oil chamber can be accurately controlled, thereby adjusting the impact force of the piston. The oil inlet and outlet chambers are also equipped with high-pressure gas chambers and low-pressure gas chambers, which can further accurately regulate the impact energy of the piston and improve the reciprocating efficiency of the piston. In addition, the control part of this hydraulic breaker is located in the middle cylinder body, resulting in a simpler structure and higher reliability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a hydraulic breaker in one embodiment of the present invention;

[0018] Figure 2 This is a front view of a hydraulic breaker in one embodiment of the present invention;

[0019] Figure 3 for Figure 2 A sectional view along the AA axis;

[0020] Figure 4 This is a side view of a hydraulic breaker in one embodiment of the present invention;

[0021] Figure 5 for Figure 4 A sectional view along the BB axis;

[0022] Figure 6 This is a perspective view of the main valve sleeve and the main valve core in one embodiment of the present invention.

[0023] Explanation of key figure labels:

[0024] 1-Upper cylinder body, 11-Air chamber, 2-Middle cylinder body, 21-Hydraulic oil chamber, 22-Control unit, 221-Hydraulic oil passage, 222-Main valve sleeve, 2221-First connecting hole, 2222-Second connecting hole, 223-Main valve core, 2231-Flow passage, 224-Main valve sleeve end cap, 23-Inlet chamber, 231-Accumulator piston, 232-Inlet chamber, 233-High-pressure gas chamber, 24-Outlet chamber, 241-Store piston, 242-Store chamber, 243-Low-pressure gas chamber, 25-Inlet hole, 26-Outlet hole, 3-Lower cylinder body, 4-Piston, 41-Limiting part, 5-Chisel rod, 6-Piston sealing sleeve, 7A-Dust seal, 7B-Sealing ring, 8-Upper cylinder sleeve, 9-Lower cylinder sleeve. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0026] like Figure 1-6 As shown, a hydraulic breaker according to one embodiment of the present invention includes an upper cylinder 1, a middle cylinder 2, a lower cylinder 3, a piston 4, and a chisel 5. The upper end of the middle cylinder 2 is connected to the lower end of the upper cylinder 1. The lower cylinder 3 is connected to the lower end of the middle cylinder 2. The piston 4 passes through the upper cylinder 1, the middle cylinder 2, and the lower cylinder 3 and can move up and down axially. The upper end of the piston 4 is located in the upper cylinder 1 and forms a sealed air chamber 11 with the inner wall of the upper cylinder 1. The air chamber 11 is filled with high-pressure gas to drive the piston 4 to move downward. The middle part of the piston 4 is housed in the middle cylinder 2 and forms a sealed hydraulic oil chamber 21 with the inner wall of the middle cylinder 2. The chisel 5 is partially housed in the lower cylinder 3, and the piston 4 transmits the impact force to one end of the chisel 5 to break the target object at the other end of the chisel 5. The cylinder block 2 is also equipped with a control unit 22 connected to the hydraulic oil chamber 21, an oil inlet chamber 23 selectively connected to the control unit 22, and an oil outlet chamber 24. The control unit 22 is used to control the hydraulic oil entering the hydraulic oil chamber 21 and exiting the hydraulic oil chamber 21 to drive the piston 4 to move up and down.

[0027] The working principle of this hydraulic breaker is as follows: In the initial state, as shown... Figure 3As shown, piston 4 is at the bottom of its stroke, and because a stepped limiting part 41 is provided on the lower part of piston 4 and inside the middle cylinder 2, piston 4 cannot move further downward. The upper cylinder 1 is filled with high-pressure gas. When the breaker needs to break the target object, hydraulic oil is added to the oil inlet chamber 23. Then, the control unit 22 is connected to the oil inlet chamber 23, and the hydraulic oil enters the control unit 22 and then enters the hydraulic oil chamber 21 from the control unit 22. Due to the pressure of the hydraulic oil, piston 4 is pushed upward and compresses the high-pressure gas in the upper cylinder 1. Then, the control unit 22 disconnects from the oil inlet chamber 23 and connects to the oil outlet chamber 24. The oil outlet chamber 24 is connected to the external power unit oil tank (e.g., the hydraulic oil tank of an excavator). When the control unit 22 connects to the drain chamber 24, the compressed high-pressure gas in the sealed cavity 11 rapidly expands. The hydraulic oil in the hydraulic oil chamber 21 is discharged from the drain chamber 24 to the external power unit oil tank via the control unit 22. Simultaneously, the piston 4 is pushed downwards and hammered onto the chisel 5. The chisel 5 transmits the impact force of the piston 4 to the target object. Then, the control unit 22 disconnects from the drain chamber 24 and connects to the inlet chamber 23. Repeating the above steps enables the reciprocating movement of the piston 4, breaking the target object.

[0028] In the above embodiment, the hydraulic breaker can effectively control the accuracy and height of piston 4 movement by setting control unit 22 and oil inlet chamber 23 and oil outlet chamber 24 connected to control unit 22, and cooperate with high pressure gas in cylinder 1 to control the impact energy of chisel 5 to achieve the corresponding crushing effect.

[0029] In one implementation, such as Figure 5 and Figure 6 As shown, the control unit 22 includes a hydraulic oil passage 221, a main valve sleeve 222, and a main valve core 223. One end of the hydraulic oil passage 221 communicates with the hydraulic oil chamber 21. The main valve sleeve 222 is fixedly disposed at the other end of the hydraulic oil passage 221. The main valve sleeve 222 is provided with a first connecting hole 2221 communicating with the oil inlet chamber 23 and a second connecting hole 2222 communicating with the oil outlet chamber 24. For example, the first connecting hole 2221 is opened on the upper side wall of the main valve sleeve 222, and the second connecting hole 2222 is opened on the lower side wall of the main valve sleeve 222.

[0030] The main valve core 223 is movably disposed within the main valve sleeve 222. The control unit 22 controls the main valve core 223 to move within the main valve sleeve 222 to control the hydraulic oil passage 221 to selectively connect with the first connecting hole 2221 or the second connecting hole 2222 on the main valve sleeve 222, thereby realizing the entry or discharge of hydraulic oil and thus realizing the up and down movement of the piston 4.

[0031] The other end of the hydraulic oil passage 221 is provided with a main valve sleeve end cap 224. The main valve sleeve end cap 224 is used to connect to an external control device, such as an external hydraulic controller. The main valve sleeve end cap 224 communicates with the main valve core 223 to control the up and down movement of the main valve core 223.

[0032] Specifically, such as Figure 6 As shown, a flow passage 2231 is provided on the side wall of the main valve core 223, and the flow passage 2231 communicates with the hydraulic oil passage 221. The main valve core 223 has a first working position and a second working position within the main valve sleeve 222. When the main valve sleeve 222 is in the first working position, the flow passage 2231 is aligned with the first communicating hole 2221, and hydraulic oil can enter the hydraulic oil passage 221 from the inlet chamber 23, and then enter the hydraulic oil chamber 21 from the hydraulic oil passage 221. After the hydraulic oil fills the hydraulic oil chamber 21, the piston 4 moves upward under the action of oil pressure, and the high-pressure gas in the cylinder is compressed. When the main valve sleeve 222 is in the second working position, the flow passage 2231 is aligned with the second communicating hole 2222, and hydraulic oil can enter the outlet chamber 24 from the hydraulic oil chamber 21 through the hydraulic oil passage 221. The high-pressure gas expands rapidly, and the piston 4 loses the oil pressure and is thus driven to move downward.

[0033] Furthermore, an oil inlet hole 25 is provided between the hydraulic oil passage 221 and the oil inlet chamber 23, and the first connecting hole 2221 communicates with the oil inlet hole 25. When the main valve sleeve 222 is in the first working position, the oil inlet hole 25, the first connecting hole 2221, and the flow hole 2231 are connected in sequence, thereby connecting the oil inlet chamber 23 with the hydraulic oil passage 221, allowing hydraulic oil to enter the hydraulic oil chamber 21. An oil outlet hole 26 is provided between the hydraulic oil passage 221 and the oil outlet chamber 24, and the second connecting hole 2222 communicates with the oil outlet hole 26. When the main valve sleeve 222 is in the second working position, the flow hole 2231, the second connecting hole 2222, and the oil outlet hole 26 are connected in sequence, thereby connecting the hydraulic oil passage 221 with the oil outlet chamber 24, allowing hydraulic oil to be discharged from the hydraulic oil chamber 21.

[0034] Because the piston 4 reciprocates at high speeds and frequencies, hydraulic oil needs to be able to be added and discharged rapidly. To achieve this, an accumulator piston 231 is installed inside the inlet chamber 23, which divides the inlet chamber 23 into a closed inlet cavity 232 and a high-pressure gas cavity 233. The size of the inlet cavity 232 and the high-pressure gas cavity 233 changes depending on the position of the accumulator piston 231. One end of the inlet chamber 23 is connected to an external oil supply device. When the external oil supply device adds hydraulic oil to the inlet cavity 232, the accumulator piston 231 moves upward and compresses the high-pressure gas in the high-pressure gas cavity 233. Therefore, when the outlet chamber 24 discharges oil to the outside, the inlet cavity 232 is filled with hydraulic oil and the high-pressure gas is compressed. Then, when the inlet cavity 232 is connected to the control unit 22, the hydraulic oil, under its own oil pressure and the gas pressure generated by the rapid expansion of the high-pressure gas, quickly enters the hydraulic oil passage 221 and the hydraulic oil cavity 21 to push the piston 4 upward.

[0035] An oil storage piston 241 is installed inside the oil discharge chamber 24, which divides the oil discharge chamber 24 into an oil storage chamber 242 and a low-pressure gas chamber 243. The sizes of the oil storage chamber 242 and the low-pressure gas chamber 243 change depending on the position of the oil storage piston 241. When the control unit 22 is connected to the oil discharge chamber 24, the high-pressure gas in the gas chamber 11 rapidly expands, pushing the piston 4 downwards. Hydraulic oil is discharged from the hydraulic oil chamber 21 through the hydraulic oil passage 221 into the oil storage chamber 242. Since the pressure generated by the rapid expansion of the high-pressure gas in the gas chamber 11 mainly acts on the piston 4, and the piston 4's own weight is insufficient to completely discharge the hydraulic oil from the oil discharge chamber 24, the hydraulic oil is temporarily stored in the oil discharge chamber 24. This allows the oil storage piston 241 to move under the oil pressure and compress the low-pressure gas in the low-pressure gas chamber 243. During the interval when piston 4 makes its next lift, the low-pressure gas expands and pushes the oil storage piston 241 to discharge the hydraulic oil temporarily stored in the oil discharge chamber 24.

[0036] With this configuration, hydraulic oil can enter or exit the hydraulic oil chamber 21 in a timely manner, and the entry and exit of hydraulic oil is more uniform through the high-pressure gas chamber 233 and the low-pressure gas chamber 243, and the reciprocating motion of the piston 4 is relatively consistent.

[0037] In one implementation, such as Figure 2As shown, a piston sealing sleeve 6 is interference-fitted between the upper part of the middle cylinder body 2 and the piston 4 to prevent communication between the upper cylinder body 1 and the middle cylinder body 2. A dust seal 7A and a sealing ring 7B are provided between the lower part of the middle cylinder body 2 and the piston 4 to seal and clean the piston 4. By providing the aforementioned piston sealing sleeve 6 and dust seal 7A, the hydraulic oil between the middle cylinder body 2 and the piston 4 will not leak internally, thus affecting the energy consumption of the equipment, and will also prevent hydraulic oil from leaking into the external environment. Furthermore, an upper cylinder sleeve 8 and a lower cylinder sleeve 9 are sequentially provided between the lower cylinder body 3 and the chisel 5 to support the chisel 5 and prevent wear on the lower cylinder body 3 during the up-and-down movement of the chisel 5. The piston sealing sleeve 6, dust seal 7A, and sealing ring 7B can be rubber rings or rubber sleeves, etc., while the upper cylinder sleeve 8 and lower cylinder sleeve 9 are made of high-strength wear-resistant steel, which is a conventional technique in this field and will not be described in detail here.

[0038] The specific working principle of the hydraulic breaker is as follows: When the hydraulic breaker needs to perform hammering, the external oil supply device injects hydraulic oil into the oil inlet chamber 232. Under the action of oil pressure, the accumulator piston 231 moves, thereby compressing the high-pressure gas in the high-pressure gas chamber 233. Then, the external control device controls the main valve core 223 to move to the first working position, and the flow passage 2231 connects with the oil inlet 25 and the first connecting hole 2221. The high-pressure gas in the high-pressure gas chamber 233 expands rapidly, forcing the hydraulic oil in the oil inlet chamber 232 into the hydraulic oil passage 221 of the control unit 22 and into the hydraulic oil chamber 21 through the hydraulic oil passage 221. When the hydraulic oil chamber 21 is full of hydraulic oil, the piston 4 is pushed upward under the action of oil pressure, and at the same time, the high-pressure gas in the gas chamber 11 is compressed. Then, the external control device controls the main valve core 223 to move to the second working position, connecting the flow hole 2231 with the second connecting hole 2222 and the oil outlet hole 26 in sequence. Hydraulic oil is discharged from the hydraulic oil chamber 21 through the hydraulic oil passage 221 to the oil discharge chamber 24 and discharged through the oil discharge chamber 24. The hydraulic oil that is not discharged in time pushes the oil storage piston 241, compressing the low-pressure gas in the low-pressure gas chamber 243. The hydraulic oil is then temporarily stored in the oil storage chamber 242. During the subsequent upward lifting of the piston 4, the low-pressure gas expands and discharges the hydraulic oil from the oil storage chamber 242. At the same time, the high-pressure gas in the gas chamber 11 expands rapidly and pushes the piston 4 downward to strike the chisel 5, achieving one hammering of the target. This cycle can achieve the reciprocating motion of the piston 4, thereby repeatedly hammering the target.

[0039] In summary, the hydraulic breaker of this invention, by setting up a control unit 22 and an oil inlet chamber 23 and an oil outlet chamber 24 connected to the control unit 22, can effectively control the movement of the piston 4 to achieve the corresponding crushing effect. By controlling the time that the main valve core 223 is at the first connecting hole 2221 of the main valve sleeve 222, the amount of hydraulic oil entering the hydraulic oil chamber 21 can be accurately controlled, thereby adjusting the impact force of the piston 3. The oil inlet chamber 23 and the oil outlet chamber 24 are also provided with a high-pressure gas chamber 233 and a low-pressure gas chamber 243, which can further accurately regulate the impact energy of the piston 4 and improve the reciprocating efficiency of the piston 4. In addition, the control part of this hydraulic breaker is mainly set in the middle cylinder 2, which makes the structure simpler and the reliability higher.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hydraulic breaking hammer, characterized in that, include; upper cylinder; The middle cylinder body, the upper end of which is connected to the lower end of the upper cylinder body; The lower cylinder body is connected to the lower end of the middle cylinder body; A piston is inserted into the upper cylinder, middle cylinder and lower cylinder and can move up and down axially; the upper end of the piston is located in the upper cylinder and forms a sealed air chamber with the inner wall of the upper cylinder, the air chamber is used to fill high pressure gas, and the middle part of the piston is housed in the middle cylinder and forms a sealed hydraulic oil chamber with the inner wall of the middle cylinder. The drill rod is partially housed within the lower cylinder. The cylinder body is provided with a control unit connected to the hydraulic oil chamber, and an oil inlet chamber and an oil outlet chamber selectively connected to the control unit. The control unit is used to control the hydraulic oil to enter the hydraulic oil chamber and to discharge from the hydraulic oil chamber, so as to drive the piston to move up and down.

2. The hydraulic breaker according to claim 1, characterized in that, The control unit includes: A hydraulic oil passage, one end of which is connected to the hydraulic oil chamber; The main valve sleeve is fixedly disposed at the other end of the hydraulic oil passage. The main valve sleeve is provided with a first connecting hole communicating with the oil inlet chamber and a second connecting hole communicating with the oil outlet chamber. The main valve core is movably disposed within the main valve sleeve, such that the first and second connecting holes selectively communicate with the hydraulic oil passage.

3. The hydraulic breaker according to claim 2, characterized in that, The other end of the hydraulic oil passage is provided with a main valve sleeve end cap, which is used to connect to an external control device to control the movement of the main valve core.

4. The hydraulic breaker according to claim 2, characterized in that, The main valve core is provided with a flow passage hole, which is connected to the hydraulic oil passage. The main valve core has a first working position and a second working position in the main valve sleeve. In the first working position, the flow passage hole is aligned with the first connecting hole, and the hydraulic oil can enter the hydraulic oil passage from the oil inlet chamber. In the second working position, the flow passage is aligned with the second connecting hole, and the hydraulic oil can enter the drain chamber from the hydraulic oil passage.

5. The hydraulic breaker according to claim 4, characterized in that, An oil inlet hole is provided between the hydraulic oil channel and the oil inlet chamber, and an oil outlet hole is provided between the hydraulic oil channel and the oil outlet chamber. The first connecting hole is connected to the oil inlet hole, and the second connecting hole is connected to the oil outlet hole.

6. The hydraulic breaker according to claim 2, characterized in that, One end of the oil inlet chamber is connected to an external oil supply device. An energy storage piston is installed in the oil inlet chamber, which is divided into a closed oil inlet chamber and a high-pressure gas chamber. When the external oil supply device adds hydraulic oil to the oil inlet chamber, the energy storage piston moves and compresses the high-pressure gas in the high-pressure gas chamber. When the hydraulic oil in the oil inlet chamber enters the control unit, the high-pressure gas expands and pushes the energy storage piston.

7. The hydraulic breaker according to claim 2, characterized in that, An oil storage piston is provided in the oil discharge chamber. The oil discharge chamber is divided into an oil storage chamber and a low-pressure gas chamber by the oil storage piston. When the hydraulic oil in the control unit is discharged into the oil storage chamber, the oil storage piston moves and compresses the low-pressure gas in the low-pressure gas chamber. When the oil storage chamber discharges the hydraulic oil to an external oil storage device, the low-pressure gas expands and pushes the oil storage piston.

8. The hydraulic breaker according to claim 1, characterized in that, A piston sealing sleeve is provided between the upper part of the middle cylinder and the piston to prevent the upper cylinder and the middle cylinder from communicating.

9. The hydraulic breaker according to claim 1, characterized in that, A dust seal and a sealing ring are provided between the lower part of the cylinder body and the piston to seal and clean the piston.

10. The hydraulic breaker according to claim 1, characterized in that, An upper cylinder sleeve and a lower cylinder sleeve are sequentially arranged between the lower cylinder body and the drill rod to support the drill rod.

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