Hydraulic breaking hammer pressure stabilizing system and hydraulic breaking hammer

Abstract

The invention provides a hydraulic breaking hammer pressure stabilizing system which comprises a high pressure stabilizer, the high pressure stabilizer is provided with a first inner cavity, a first plunger is arranged in the first inner cavity and divides the first inner cavity into a first nitrogen chamber and a first hydraulic chamber, the first hydraulic chamber is connected with an upper cavity, and the first nitrogen chamber is communicated with the first inner cavity. The first nitrogen chamber is communicated with a main nitrogen chamber of the main energy accumulator; when the piston moves upwards in a reversing mode, instantaneous high pressure generated in the upper cavity pushes the first plunger to move towards the first nitrogen chamber, and the instantaneous high pressure is absorbed. The problem of instantaneous abnormal high pressure generated by the upper cavity during reversing of the piston is effectively solved through the pressure stabilizing system, excessive pressure can be absorbed without interfering the normal hydraulic impact process, and therefore the impact performance is guaranteed, damage of abnormal pressure fluctuation to a breaking hammer sealing piece and a hydraulic element is remarkably reduced, and the service life of the breaking hammer is prolonged. The service life of the breaking hammer hydraulic system is prolonged, and the maintenance frequency and cost of equipment are reduced.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic breaker hammers, and in particular relates to a hydraulic breaker hammer pressure stabilizing system and a hydraulic breaker hammer. Background Art

[0002] Hydraulic breakers, a common construction machinery accessory, are widely used in mining, construction, and other fields. Their operating principle is that a hydraulic system drives a piston to reciprocate, converting hydraulic energy into impact energy, which is ultimately transferred to the workpiece by the drill rod. In existing technologies, hydraulic breakers typically use high-pressure hydraulic oil to push the piston to store energy and then quickly release it, causing the piston to strike the drill rod at high speed to complete the impact operation.

[0003] However, existing hydraulic systems for breaker hammers suffer from a flaw: when the piston rebounds after impact, the oil in the upper chamber of the piston cannot be drained due to a delay in the reversing valve's operation, resulting in an instantaneous buildup of abnormally high pressure. This peak pressure far exceeds the system's normal operating pressure, severely impacting the hydraulic system. This transient high pressure not only accelerates seal aging but also damages the cylinder's inner wall, leading to oil leaks and other problems. Over time, this reduces equipment reliability and significantly increases maintenance costs. Summary of the Invention

[0004] The embodiments of the present invention provide a hydraulic breaker pressure stabilizing system and a hydraulic breaker, aiming to solve the above-mentioned technical problems.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a hydraulic breaker hammer pressure stabilization system, including a middle cylinder body, an upper cylinder body assembled on the middle cylinder body, a piston reciprocating in the middle cylinder body, and a reversing valve and a main accumulator assembled outside the middle cylinder body, wherein the piston divides the middle cylinder body into an upper chamber, a signal chamber and a lower chamber, wherein the lower chamber is connected to the oil inlet oil circuit, the upper chamber is connected to the reversing valve and is connected to the return oil circuit or the oil inlet oil circuit based on different working positions of the valve core, the signal chamber is connected to the pilot control end of the reversing valve to control the switching of the working position of the reversing valve, and is characterized in that the pressure stabilization system includes: A high-pressure regulator, comprising a first inner cavity, wherein a first plunger or an elastic diaphragm is disposed in the first inner cavity, the first plunger or the elastic diaphragm dividing the inner cavity into a first nitrogen chamber and a first hydraulic chamber, wherein the first hydraulic chamber is connected to the upper cavity, and the first nitrogen chamber is connected to the main nitrogen chamber of the main accumulator; When the piston moves upward, the instantaneous high pressure generated in the upper chamber pushes the first plunger to move toward the first nitrogen chamber or drives the elastic diaphragm to contract toward the first nitrogen chamber to absorb the instantaneous high pressure.

[0006] In the embodiment of the present application, the problem of instantaneous abnormal high pressure generated in the upper chamber when the piston is reversed is effectively solved through the pressure stabilization system, which can absorb excess pressure without interfering with the normal hydraulic impact process. While ensuring the impact performance, it significantly reduces the damage to the breaker hammer seals and hydraulic components caused by abnormal pressure fluctuations, extends the service life of the breaker hammer hydraulic system, and reduces the maintenance frequency and cost of the equipment.

[0007] In one embodiment, the hydraulic breaker pressure stabilization system further includes: A low-pressure regulator, comprising a second inner cavity, wherein a second plunger is disposed in the second inner cavity, and the second plunger divides the second inner cavity into a second nitrogen chamber and a second hydraulic chamber, wherein the second hydraulic chamber is connected to the oil return line; When the piston moves upward, the high pressure generated in the upper chamber pushes the second plunger to move toward the second nitrogen chamber to absorb hydraulic fluctuations.

[0008] In the embodiment of the present application, a low-pressure stabilizer is provided to prevent damage to the pipeline caused by oil pressure fluctuations in the return oil circuit just after the piston switches from the downward state to the upward state, thereby ensuring the normal operation of the system and improving the service life of the equipment.

[0009] In one embodiment, a throttle valve is provided in the oil circuit between the main nitrogen chamber and the first nitrogen chamber.

[0010] In the embodiment of the present application, a throttle valve is provided between the main nitrogen chamber and the first nitrogen chamber, which can reduce the air pressure loss in the first nitrogen chamber during the rapid downward phase of the piston and ensure the normal operation of the system.

[0011] In one embodiment, the oil return circuit includes a main oil return circuit and a first oil return circuit and a second oil return circuit connected to the main oil return circuit, the first oil return circuit is connected to the second hydraulic chamber, and the second oil return circuit is connected to the reversing valve; When the piston moves upward, the second oil return path is connected to the upper chamber through the reversing valve; When the piston moves downward, the second oil return line is cut off by the reversing valve; The oil inlet circuit includes a main oil inlet circuit and a first oil inlet circuit and a second oil inlet circuit connected to the main oil inlet circuit, wherein the first oil inlet circuit is connected to the lower chamber, and the second oil inlet circuit is connected to the reversing valve; When the piston moves upward, the second oil inlet path is cut off by the reversing valve; When the piston moves downward, the second oil inlet path is connected to the upper chamber through the reversing valve.

[0012] In one embodiment, an inner shoulder suitable for limiting the position of the first plunger is formed in the first hydraulic chamber; The first nitrogen chamber is equipped with a detachable first end cover; An air passage communicating with the first nitrogen chamber is provided in the cylinder of the high-voltage regulator. The air passage communicates with an air port provided on the bottom end surface of the high-voltage regulator and is suitable for communicating with the main nitrogen chamber.

[0013] In one embodiment, an upper chamber oil return path communicating with the upper chamber is opened in the outer walls of the upper cylinder body and the middle cylinder body; The bottom of the high-voltage regulator is provided with a first assembly portion, the high-voltage regulator is plugged into the assembly hole of the middle cylinder, and the first assembly portion is provided with an annular groove suitable for accommodating a sealing ring; A first oil port communicating with the first hydraulic chamber is provided in the first assembly portion, and the first oil port is adapted to communicate with the upper chamber oil return line; A threaded hole is vertically opened on the high-voltage regulator and passes through the outer wall thereof. The high-voltage regulator is fixed to the middle cylinder body by bolts.

[0014] In one embodiment, an inner shoulder adapted to limit the position of the second plunger is formed in the second hydraulic chamber; The second nitrogen chamber is equipped with a detachable second end cover, and the second end cover is provided with an intake valve suitable for connecting to an intake pipeline.

[0015] In one embodiment, the main oil return path and the first oil return path are both opened in the outer wall of the middle cylinder; The bottom of the low-voltage regulator is provided with a second assembly portion, which is plugged into the assembly hole of the upper cylinder body and has an annular groove suitable for accommodating a sealing ring. A second oil port communicating with the second hydraulic chamber is formed in the second assembly portion, and the second oil port is adapted to communicate with the main oil return circuit or the first oil return circuit; A threaded hole is vertically opened on the low-voltage regulator and passes through the outer wall thereof. The low-voltage regulator is fixed to the upper cylinder body by bolts.

[0016] In one embodiment, a sealing ring is provided on both the first end cover and the second end cover.

[0017] On the other hand, the present invention provides a hydraulic breaker hammer, comprising the hydraulic breaker hammer pressure stabilization system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the hydraulic breaker pressure stabilizing system of embodiment 1 of the present invention (the valve core of the reversing valve is located on the right); Figure 2 This is the hydraulic breaker pressure stabilization system of embodiment 1 of the present invention (the valve core of the reversing valve is located on the left); Figure 3 This is the hydraulic breaker pressure stabilizing system of the second embodiment of the present invention; Figure 4 It is a structural diagram of the hydraulic breaker hammer of the present invention; Figure 5 Schematic diagram of the structure of the low voltage regulator of the present invention; Figure 6 Schematic diagram of the structure of a high-voltage regulator according to the first embodiment of the present invention; Figure 7 Schematic diagram of the structure of a high-voltage regulator according to the second embodiment of the present invention.

[0019] Description of reference numerals: 011-main oil inlet; 012-second oil inlet; 013-first oil inlet; 02-main accumulator; 021-main nitrogen chamber; 03-high-pressure regulator; 031-first end cover; 032-first nitrogen chamber; 033-first plunger; 034-first hydraulic chamber; 035-first assembly part; 036-first oil port; 037-air duct; 038-elastic diaphragm; 041-main oil return line; 042-second oil return line; 043-first oil return line; 05- low-pressure regulator; 051- inlet valve; 052- second end cover; 053- second nitrogen chamber; 054- second plunger; 055- second hydraulic chamber; 056- second assembly part; 057- second oil port; 06-upper cavity; 07-middle cylinder; 08-Signal cavity; 09-lower cavity; 10-piston; 11- reversing valve; 12-throttle valve; 13-Upper cylinder; 14-Upper chamber oil return line. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0022] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] As an essential accessory for construction machinery, a hydraulic breaker operates by using hydraulic oil to drive the reciprocating motion of a piston to achieve impact. During actual operation, after the piston completes its downward impact, it rapidly rebounds upward due to the reaction force. At this point, due to a brief delay in the reversing valve's response, the oil circuit fails to switch in time, resulting in the upper chamber failing to connect to the return oil circuit. The piston's high-speed upward movement compresses the hydraulic oil in the upper chamber, causing its pressure to rise sharply, resulting in an abnormally high instantaneous pressure far exceeding the system's operating pressure. This abnormally high pressure not only increases the load on the hydraulic system but also impacts key components such as seals and cylinder walls. Long-term effects can lead to seal failure, oil leakage, and even structural damage, significantly shortening the equipment's service life and maintenance cycle.

[0025] In response to the above technical problems, the present invention provides a hydraulic breaker hammer pressure stabilization system and a hydraulic breaker hammer, in which a high-pressure stabilizer is added to the return oil circuit of the upper chamber to absorb the abnormal high pressure generated instantaneously in the upper chamber when the piston is reversed, thereby alleviating the impact of the abnormal pressure on the equipment. This not only protects the sealing elements and hydraulic elements of the breaker hammer from damage by high pressure, but also maintains the stable operation of the system, thereby extending the overall service life of the breaker hammer.

[0026] Please refer to the attached Figure 1 To the attached Figure 7The hydraulic breaker hammer pressure stabilization system and hydraulic breaker provided by the present invention are now described. The hydraulic breaker hammer pressure stabilization system includes a high-pressure regulator 03 connected to the upper chamber 06. At the moment the piston 10 shifts to the upward phase, the reversing valve 11 has not yet switched to its working position. At this time, the upper chamber 06 is connected to the oil inlet line through the reversing valve 11. The piston 10 collides with the drill rod, upwardly squeezing the high-pressure oil in the upper chamber 06, instantly generating abnormally high pressure. This abnormally high pressure exceeds the operating pressure in the first nitrogen chamber 032 of the high-pressure regulator 03. Therefore, it can push the first plunger 033 or the elastic diaphragm 038 to compress the air pressure in the first nitrogen chamber 032, absorbing the abnormally high pressure in the upper chamber 06. Specifically, the hydraulic breaker pressure stabilizing system includes a middle cylinder body 07, an upper cylinder body 13 assembled on the middle cylinder body 07, a piston 10 reciprocating in the middle cylinder body 07, and a reversing valve 11 and a main accumulator 02 assembled outside the middle cylinder body 07. The piston 10 separates the middle cylinder body 07 into an upper chamber 06, a signal chamber 08 and a lower chamber 09, wherein the lower chamber 09 is connected to the oil inlet circuit, the upper chamber 06 is connected to the reversing valve 11, and is connected to the return oil circuit or the oil inlet circuit based on different working positions of the valve core, and the signal chamber 08 is connected to the pilot control end of the reversing valve 11 to control the switching of the working position of the reversing valve 11. In addition, the hydraulic breaker pressure stabilization system also includes a high-pressure stabilizer 03, which is provided with a first inner cavity. A first plunger 033 or an elastic diaphragm 038 is provided in the first inner cavity. The first plunger 033 or the elastic diaphragm 038 divides the inner cavity into a first nitrogen chamber 032 and a first hydraulic chamber 034, wherein the first hydraulic chamber 034 is connected to the upper cavity 06, and the first nitrogen chamber 032 is connected to the main nitrogen chamber 021 of the main accumulator 02; when the piston 10 reverses upward, the instantaneous high pressure generated in the upper cavity 06 pushes the first plunger 033 toward the first nitrogen chamber 032 or drives the elastic diaphragm 038 to contract toward the first nitrogen chamber 032, thereby absorbing the instantaneous high pressure.

[0027] Specifically, the elastic diaphragm 038 is a basin-shaped structure, the main body of which is made of rubber or polyurethane, and the basin is made of hard materials such as metal to ensure that the elastic diaphragm 038 can withstand high pressure.

[0028] For the upward phase of piston 10, please refer to the attached Figure 1The valve sleeve of the reversing valve 11 is on the right side. At this time, oil enters the lower chamber 09 and returns to the upper chamber 06. The oil pressure in the lower chamber 09 is higher than that in the upper chamber 06, thereby pushing the piston 10 to move upward. The piston 10 squeezes the nitrogen in the nitrogen chamber of the cylinder to accumulate energy. At this time, the main accumulator 02 connected to the oil inlet line is connected to the lower chamber 09. Under the action of the working oil pressure of the lower chamber 09 (i.e., the oil inlet pressure), the leather cup of the main accumulator 02 squeezes the main nitrogen chamber 021 upward, so that the pressure in the main nitrogen chamber 021 is equal to the working oil pressure. Since the first nitrogen chamber 032 is connected to the main nitrogen chamber 021, the pressure in the first nitrogen chamber 032 is also equal to the working oil pressure. At this stage, the working oil pressure in the lower chamber 09 is greater than that in the upper chamber 06, that is, the pressure in the first nitrogen chamber 032 is greater than that in the upper chamber 06. The first hydraulic chamber 034 is connected to the upper chamber 06, so the pressure in the first nitrogen chamber 032 is greater than that in the first hydraulic chamber 034, and the first plunger 033 is always maintained at the lowest position, ensuring that the high-pressure stabilizer 03 does not work during the upward stage of the piston 10.

[0029] When the piston 10 switches from upward to downward movement, the pressure stabilizing system Figure 1 Switch to Attachment Figure 2 In the state of 09, piston 10 ascends to its highest position, and the pressure in lower chamber 09 and the cylinder nitrogen chamber reaches its maximum. At this point, lower chamber 09 communicates with signal chamber 08 through a groove on piston 10, and thus with the pilot control port on the right side of reversing valve 11. Under the high pressure of lower chamber 09, the valve sleeve of reversing valve 11 moves to the left, and upper chamber 06 communicates with the oil inlet line through reversing valve 11. At this point, piston 10 switches to the downward state.

[0030] For the downward phase of piston 10, please refer to the attached Figure 2 Oil enters both upper and lower chambers 06 and 09 simultaneously, creating the same pressure. Because the contact area between upper chamber 06 and piston 10 is greater than that between lower chamber 09 and piston 10, the pressure in upper chamber 06 is greater than that in lower chamber 09, exerting a downward thrust on piston 10. Driven by the pressure differential between upper and lower chambers 09 and the thrust from the cylinder's nitrogen chamber, piston 10 accelerates downward. The cup of main accumulator 02 presses hydraulic oil downward, replenishing the oil inlet line and addressing the issue of insufficient oil flow caused by the high-speed impact of piston 10.

[0031] When the piston 10 switches from downward movement to upward movement, the pressure stabilizing system Figure 2 Switch to Attachment Figure 1 In the state, the piston 10 is at the lowest position. At this time, the signal chamber 08 is connected to the return oil circuit, and the pilot control end of the reversing valve 11 is connected to the low-pressure signal chamber 08, causing the valve sleeve to move to the right.

[0032] In the embodiment of the present application, high-pressure regulator 03 is in communication with upper chamber 06, capable of absorbing the abnormally high pressure generated within upper chamber 06 at the moment piston 10 switches to the upward state. First nitrogen chamber 032 is in communication with main nitrogen chamber 021, maintaining the operating pressure within it. This ensures that high-pressure regulator 03 does not affect the hydraulic system when the oil pressure in upper chamber 06 is normal. This solution accurately identifies and eliminates oil pressure peaks exceeding the operating oil pressure without interfering with the normal hydraulic shock process. This significantly reduces damage to sealing and hydraulic components caused by abnormally high pressure while maintaining shock performance, extending the equipment's service life and reducing maintenance frequency and costs.

[0033] In one embodiment, the hydraulic breaker pressure stabilization system also includes a low-pressure stabilizer 05. When the piston 10 is just switched to the upward state, the upper chamber 06 is connected to the oil return line. The low-pressure stabilizer 05 can absorb some of the high-pressure oil rapidly flowing from the upper chamber 06 into the oil return line, while the high-pressure stabilizer 03 releases the stored abnormal hydraulic pressure. Specifically, the low-pressure stabilizer 05 is provided with a second inner chamber, and a second plunger 054 is provided in the second inner chamber. The second plunger 054 divides the second inner chamber into a second nitrogen chamber 053 and a second hydraulic chamber 055, wherein the second hydraulic chamber 055 is connected to the oil return line. When the piston 10 moves upward, the high pressure generated in the upper chamber 06 pushes the second plunger 054 toward the second nitrogen chamber 053, absorbing the hydraulic fluctuations.

[0034] When piston 10 is initially switched to the upward position, a large amount of high-pressure oil flows into the return oil line, causing the oil pressure in the line to rise suddenly. In this embodiment of the application, a low-pressure regulator 05 is installed in the return oil line to absorb abnormally high pressure in the circuit, preventing vibration caused by high pressure impacting the pipeline, preventing pipeline damage, and extending the service life of the equipment.

[0035] In one embodiment, a throttle valve 12 is provided in the oil circuit between the main nitrogen chamber 021 and the first nitrogen chamber 032. Because the piston 10 rapidly descends, oil needs to be replenished from the main accumulator 02, causing some pressure loss within the main nitrogen chamber 021. Providing a throttle valve 12 between the main nitrogen chamber 021 and the first nitrogen chamber 032 mitigates pressure fluctuations within the first nitrogen chamber 032.

[0036] In one embodiment, the high-pressure regulator 03 employs a plunger-type structure, with an internal shoulder formed within the first hydraulic chamber 034 to limit the position of the first plunger 033. A removable first end cap 031 is mounted on the first nitrogen chamber 032. An air passage 037 is defined within the cylinder of the high-pressure regulator 03, communicating with the first nitrogen chamber 032. This air passage 037 communicates with a port on the bottom surface of the high-pressure regulator 03, which is adapted to connect to the main nitrogen chamber 021.

[0037] In one embodiment, an upper chamber oil return line 14 communicating with the upper chamber 06 is provided in the outer walls of the upper cylinder body 13 and the middle cylinder body 07. A first assembly portion 035 is formed at the bottom of the high-pressure regulator, which is plugged into the assembly hole of the middle cylinder body 07. An annular groove suitable for accommodating a sealing ring is provided on the first assembly portion 035. A first oil port 036 communicating with the first hydraulic chamber is provided in the first assembly portion 035. The first oil port 036 is suitable for communicating with the upper chamber oil return line 14. A threaded hole is vertically provided on the high-pressure regulator, which passes through its outer wall. The high-pressure regulator is fixed to the middle cylinder body 07 by bolts.

[0038] In one embodiment, the high-voltage regulator 03 employs a diaphragm structure. The bottom of the high-voltage regulator 03 is provided with multiple oil-passing sieve holes that communicate with the first hydraulic chamber 034. These sieve holes are adapted to communicate with the upper chamber oil return line 14. An air passage 037 is also provided within the cylinder of the high-voltage regulator 03, communicating with the first nitrogen chamber 032. This air passage 037 communicates with an air port located at the bottom of the high-voltage regulator 03, which is adapted to communicate with the main nitrogen chamber 021.

[0039] In one embodiment, the oil return circuit includes a main oil return circuit 041, as well as a first oil return circuit 043 and a second oil return circuit 042 connected to the main oil return circuit 041. The first oil return circuit 043 is connected to the second hydraulic chamber 055, and the second oil return circuit 042 is connected to the reversing valve 11. When the piston 10 moves upward, the second oil return circuit 042 is connected to the upper chamber 06 through the reversing valve 11. When the piston 10 moves downward, the second oil return circuit 042 is blocked by the reversing valve 11. The oil supply circuit includes a main oil supply circuit 011, as well as a first oil supply circuit 013 and a second oil supply circuit 012 connected to the main oil supply circuit 011. The first oil supply circuit 013 is connected to the lower chamber 09, and the second oil supply circuit 012 is connected to the reversing valve 11. When the piston 10 moves upward, the second oil supply circuit 012 is blocked by the reversing valve 11; when the piston 10 moves downward, the second oil supply circuit 012 is connected to the upper chamber 06 through the reversing valve 11.

[0040] In one embodiment, the second hydraulic chamber 055 is provided with an inner shoulder adapted to limit the second plunger 054. The second nitrogen chamber 053 is provided with a detachable second end cap 052, which is provided with an intake valve 051 adapted to connect to an intake line.

[0041] In one embodiment, the main oil return line 041 and the first oil return line 043 are both formed in the outer wall of the middle cylinder body 07. A second assembly portion 056 is formed at the bottom of the low-pressure regulator 05. The second assembly portion 056 is inserted into the assembly hole of the upper cylinder body 13. The second assembly portion 056 is provided with an annular groove suitable for accommodating a sealing ring. A second oil port 057 is provided within the second assembly portion 056, which is in communication with the second hydraulic chamber 055. The second oil port 057 is suitable for communication with the main oil return line 041 or the first oil return line 043. A threaded hole is vertically formed through the outer wall of the low-pressure regulator 05. The low-pressure regulator 05 is fixed to the upper cylinder body 13 by bolts. The low-pressure regulator 05 and the high-pressure regulator 03 are detachably assembled to the middle cylinder body 07, facilitating disassembly and replacement.

[0042] In one embodiment, sealing rings are provided on both the first end cover 031 and the second end cover 052 to improve the sealing performance of the high-voltage regulator 03 and the low-voltage regulator 05 and ensure the normal operation of the voltage stabilization system.

[0043] The present invention provides a hydraulic breaker hammer, comprising the hydraulic breaker hammer pressure stabilizing system provided in the above embodiment.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic breaker pressure stabilization system, comprising a middle cylinder, an upper cylinder mounted on the middle cylinder, a piston reciprocating in the middle cylinder, and a reversing valve and a main accumulator mounted outside the middle cylinder, wherein the piston divides the middle cylinder into an upper chamber, a signal chamber, and a lower chamber. The lower chamber is connected to the oil inlet circuit, the upper chamber is connected to the reversing valve, and is connected to the oil return circuit or the oil inlet circuit based on different working positions of the valve core. The signal chamber is connected to the pilot control end of the reversing valve to control the switching of the working position of the reversing valve. It is characterized in that the pressure stabilizing system includes: A high-pressure regulator, comprising a first inner cavity, wherein a first plunger or an elastic diaphragm is disposed in the first inner cavity, the first plunger or the elastic diaphragm dividing the inner cavity into a first nitrogen chamber and a first hydraulic chamber, wherein the first hydraulic chamber is connected to the upper cavity, and the first nitrogen chamber is connected to the main nitrogen chamber of the main accumulator; When the piston moves upward, the instantaneous high pressure generated in the upper chamber pushes the first plunger to move toward the first nitrogen chamber or drives the elastic diaphragm to contract toward the first nitrogen chamber to absorb the instantaneous high pressure.

2. A hydraulic breaker pressure stabilizing system according to claim 1, characterized in that: Also includes: A low-pressure regulator, comprising a second inner cavity, wherein a second plunger is disposed in the second inner cavity, and the second plunger divides the second inner cavity into a second nitrogen chamber and a second hydraulic chamber, wherein the second hydraulic chamber is connected to the oil return line; When the piston moves upward, the high pressure generated in the upper chamber pushes the second plunger to move toward the second nitrogen chamber to absorb hydraulic fluctuations.

3. A hydraulic breaker pressure stabilizing system according to claim 1, characterized in that: A throttle valve is provided in the oil passage between the main nitrogen chamber and the first nitrogen chamber.

4. A hydraulic breaker pressure stabilizing system according to claim 2, characterized in that: The oil return circuit includes a main oil return circuit and a first oil return circuit and a second oil return circuit connected to the main oil return circuit, the first oil return circuit is connected to the second hydraulic chamber, and the second oil return circuit is connected to the reversing valve; When the piston moves upward, the second oil return path is connected to the upper chamber through the reversing valve; When the piston moves downward, the second oil return line is cut off by the reversing valve; The oil inlet circuit includes a main oil inlet circuit and a first oil inlet circuit and a second oil inlet circuit connected to the main oil inlet circuit, wherein the first oil inlet circuit is connected to the lower chamber, and the second oil inlet circuit is connected to the reversing valve; When the piston moves upward, the second oil inlet path is cut off by the reversing valve; When the piston moves downward, the second oil inlet path is connected to the upper chamber through the reversing valve.

5. A hydraulic breaker pressure stabilizing system according to claim 1, characterized in that: An inner shoulder adapted to limit the first plunger is formed in the first hydraulic chamber; The first nitrogen chamber is equipped with a detachable first end cover; An air passage communicating with the first nitrogen chamber is provided in the cylinder of the high-voltage regulator. The air passage communicates with an air port provided on the bottom end surface of the high-voltage regulator and is suitable for communicating with the main nitrogen chamber.

6. A hydraulic breaker pressure stabilizing system according to claim 4, characterized in that: An upper chamber oil return passage communicating with the upper chamber is provided in the outer walls of the upper cylinder body and the middle cylinder body; The bottom of the high-voltage regulator is provided with a first assembly portion, the high-voltage regulator is plugged into the assembly hole of the middle cylinder, and the first assembly portion is provided with an annular groove suitable for accommodating a sealing ring; A first oil port communicating with the first hydraulic chamber is provided in the first assembly portion, and the first oil port is adapted to communicate with the upper chamber oil return line; A threaded hole is vertically opened on the high-voltage regulator and passes through the outer wall thereof. The high-voltage regulator is fixed to the middle cylinder body by bolts.

7. A hydraulic breaker pressure stabilizing system according to claim 5, characterized in that: An inner shoulder adapted to limit the position of the second plunger is formed in the second hydraulic chamber; The second nitrogen chamber is equipped with a detachable second end cover, and the second end cover is provided with an intake valve suitable for connecting to an intake pipeline.

8. A hydraulic breaker pressure stabilizing system according to claim 4, characterized in that: The main oil return passage and the first oil return passage are both opened in the outer wall of the middle cylinder; The bottom of the low-voltage regulator is provided with a second assembly portion, which is plugged into the assembly hole of the upper cylinder body and has an annular groove suitable for accommodating a sealing ring. A second oil port communicating with the second hydraulic chamber is formed in the second assembly portion, and the second oil port is adapted to communicate with the main oil return circuit or the first oil return circuit; A threaded hole is vertically opened on the low-voltage regulator and passes through the outer wall thereof. The low-voltage regulator is fixed to the upper cylinder body by bolts.

9. A hydraulic breaker pressure stabilizing system according to claim 7, characterized in that: The first end cover and the second end cover are both provided with sealing rings.

10. A hydraulic breaker, characterized in that: It comprises the hydraulic breaker hammer pressure stabilization system as described in any one of claims 1-9.

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