Hydraulic hammer with built-in piston accumulator

Abstract

The utility model relates to hydraulic impact hammer technical field especially relates to a kind of hydraulic hammer with built-in piston accumulator, including cylinder body and oil inlet channel and oil return channel.The first energy storage mechanism, the first energy storage mechanism includes first chamber and the first sealing assembly reciprocatingly slidably arranged along the central axis direction of first chamber;First sealing assembly divides first chamber into first hydraulic oil chamber and first nitrogen chamber independent of each other, and first hydraulic oil chamber is communicated with oil inlet channel;Second energy storage mechanism, second energy storage mechanism includes second chamber and the second sealing assembly reciprocatingly slidably arranged along the central axis direction of second chamber;Second sealing assembly divides first chamber into second hydraulic oil chamber and second nitrogen chamber independent of each other, and second hydraulic oil chamber is communicated with oil return channel, and first chamber is not communicated with second chamber.The utility model solves the problem that hydraulic oil produces water hammer effect in hydraulic oil pipeline when hydraulic hammer works, causes unstable hydraulic system, and low service life problem by built-in piston accumulator.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic impact hammer technology, and in particular to a hydraulic hammer with a built-in piston accumulator. Background Technology

[0002] In infrastructure construction, using excavators equipped with hydraulic impact hammers to break reinforced concrete or underground rock is a common construction machinery and method. In mining blasting, hydraulic rock drills are also widely used to impact and break boreholes, which are then filled with explosives for blasting. In hydraulic hammer impact breaking operations, the higher the impact frequency, the higher the breaking efficiency. However, this causes the reversing valve inside the hydraulic impact hammer to generate larger and more intense impact vibrations when switching at high frequencies. Especially when the hydraulic oil pipes are long and the hydraulic oil flow rate is greater than 3-5 m / s, a "water hammer" effect can occur within the hydraulic oil pipes, easily damaging the hydraulic oil pipes and their joints due to impact vibrations.

[0003] Hydraulic breakers and rock drills were introduced to China from abroad in the 1970s and 1980s. To solve the impact and vibration problems of hydraulic breaker hammers, the original foreign technology generally used an oil port led out from the hydraulic hammer body, and a corresponding diaphragm-type shock-absorbing accumulator was installed on the outside of the hammer body through this oil port. Because the accumulator is installed on the outside of the hammer body, it increases the overall installation volume of the hydraulic hammer on the equipment. For some equipment with limited installation conditions, it is difficult to install a hydraulic hammer with such an external diaphragm accumulator.

[0004] Furthermore, when the hydraulic lines on a hydraulic hammer are very long, exceeding 30 meters, a "water hammer" effect occurs during operation. This effect causes extremely high instantaneous pressure within the hydraulic system, sometimes exceeding 30-40 MPa. Since the accumulator diaphragm is made of rubber, it is easily punctured and damaged under high-pressure impact. Utility Model Content

[0005] To address at least one of the aforementioned technical problems, this utility model proposes a hydraulic hammer with a built-in piston accumulator. This solves the problems of inconvenience in using existing external accumulators, the impact force generated by hydraulic oil in the hydraulic oil pipeline easily damaging the external accumulator, resulting in instability of the hydraulic system and a short service life.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A hydraulic hammer with a built-in piston accumulator includes:

[0008] A hydraulic hammer, including a cylinder and an oil inlet channel and an oil return channel arranged along the central axis of the hydraulic hammer;

[0009] The first energy storage mechanism is used to absorb the impact force in the oil inlet channel through a buffering effect. The first energy storage mechanism includes a first chamber disposed in the cylinder of the hydraulic hammer and a first sealing assembly that is reciprocated along the central axis of the first chamber. The first sealing assembly divides the first chamber into a first hydraulic oil chamber and a first nitrogen chamber that are independent of each other. The first hydraulic oil chamber is connected to the oil inlet channel, and the first nitrogen chamber is filled with nitrogen through a first gas filling assembly.

[0010] The second energy storage mechanism is used to absorb the impact force in the return oil channel through a buffering effect. The second energy storage mechanism includes a second chamber disposed in the cylinder of the hydraulic hammer and a second sealing assembly that reciprocates along the central axis of the second chamber. The second sealing assembly divides the first chamber into a second hydraulic oil chamber and a second nitrogen chamber that are independent of each other. The second hydraulic oil chamber is connected to the return oil channel, and the second nitrogen chamber is filled with nitrogen through a second gas filling assembly. The first chamber and the second chamber are not connected.

[0011] Preferably, the diameter of the first chamber is larger than the diameter of the oil inlet channel, and the diameter of the second chamber is larger than the diameter of the oil return channel.

[0012] Preferably, the central axes of the first chamber and the second chamber are perpendicular to the central axes of the oil inlet channel and the oil return channel, respectively.

[0013] Preferably, the central axes of the first chamber and the second chamber coincide with the central axes of the oil inlet channel and the oil return channel, respectively.

[0014] Preferably, the first nitrogen chamber and the second nitrogen chamber are provided with airbags for cushioning.

[0015] Preferably, the first nitrogen chamber and the second nitrogen chamber are provided with springs for cushioning.

[0016] Preferably, the first sealing assembly includes a first piston that reciprocates along the axial direction of the first chamber and a first sealing ring embedded on the outer periphery of the first piston;

[0017] The second sealing assembly includes a second piston that reciprocates along the axial direction of the second chamber and a second sealing ring embedded on the outer periphery of the second piston.

[0018] Preferably, both the first piston and the second piston are made of metal, silicon-based material, or plastic; both the first sealing ring and the second sealing ring are made of polyurethane, fluororubber, or nitrile rubber.

[0019] Preferably, the first inflation assembly includes a first plug fixedly disposed in the first chamber and having a first inflation hole communicating with the first nitrogen chamber, and the side of the first plug away from the first nitrogen chamber is provided with a first inflation plug communicating with the first inflation hole for filling with nitrogen.

[0020] The second inflation assembly includes a second plug fixedly disposed in the second chamber and having a second inflation hole communicating with the second nitrogen chamber. The side of the second plug away from the second nitrogen chamber is provided with a second inflation plug communicating with the second inflation hole for filling with nitrogen.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] This invention features a first chamber and a second chamber inside the cylinder of a hydraulic hammer, connected to the inlet and return oil channels. When the hydraulic hammer operates, the hydraulic oil in the inlet and return oil channels drives the hammer core to reciprocate up and down, generating a certain impact force. Under this impact force, the first and second sealing components are pushed into the first and second nitrogen chambers, compressing the nitrogen gas filled within. This nitrogen compression absorbs the impact energy of the hydraulic oil, effectively reducing the vibration intensity of the hydraulic pipes and extending the service life of the hydraulic pipes and related components. Simultaneously, the independent first and second chambers prevent mutual interference between the two energy storage mechanisms, ensuring each chamber independently buffers the impact forces of the inlet and return oil, further improving the stability of the hydraulic system.

[0023] This invention utilizes the fact that the diameter of the first chamber (second chamber) is larger than the diameter of the oil inlet channel (oil return channel). When hydraulic oil flows into the first and second chambers with larger cross-sections, the flow rate of the hydraulic oil will be significantly reduced due to the increased buffer volume. The impact force of the hydraulic oil is initially attenuated, which significantly reduces the instantaneous impact force of the hydraulic oil on the first and second pistons compared to the same diameter, and further improves the stability of the hydraulic system. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a hydraulic hammer with a built-in piston accumulator (the accumulator mechanism is arranged vertically);

[0025] Figure 2 This is a schematic diagram of a hydraulic hammer with a built-in piston accumulator (the accumulator mechanism is arranged horizontally);

[0026] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 4 for Figure 2 Enlarged view at point B in the middle;

[0028] Figure 5 This is a top view of the first and second energy storage mechanisms in this utility model;

[0029] Figure 6 A schematic diagram showing the structure in which springs are installed in the first and second nitrogen chambers;

[0030] Figure 7 A schematic diagram showing the structure of the first and second nitrogen chambers equipped with airbags.

[0031] In the diagram: 10. Hydraulic hammer; 101. Oil inlet channel; 102. Oil return channel; 20. Cylinder body;

[0032] 30. First energy storage mechanism; 301. First chamber; 3011. First hydraulic oil chamber; 3012. First nitrogen chamber; 302. First sealing assembly; 3021. First piston; 3022. First sealing ring; 303. First inflation assembly; 3031. First plug; 30311. First inflation port; 3032. First inflation plug;

[0033] 40. Second energy storage mechanism; 401. Second chamber; 4011. Second hydraulic oil chamber; 4012. Second nitrogen chamber; 402. Second sealing assembly; 4021. Second piston; 4022. Second sealing ring; 403. Second air filling assembly; 4031. Second plug; 40311. Second air filling hole; 4032. Second air filling plug;

[0034] 50. Airbag;

[0035] 60. Spring. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions in this utility model, the technical solutions in 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 a part of the embodiments in this utility model, and not all of the embodiments in this utility model.

[0037] Please refer to Figures 1-7 As shown, a hydraulic hammer 10 with a built-in piston accumulator includes:

[0038] The hydraulic hammer 10 includes a cylinder 20 and an oil inlet channel 101 and an oil return channel 102 arranged along the central axis of the hydraulic hammer 10.

[0039] The first energy storage mechanism 30 is used to absorb the impact force in the oil inlet channel 101 through a buffering effect. The first energy storage mechanism 30 includes a first chamber 301 disposed in the cylinder 20 of the hydraulic hammer 10 and a first sealing component 302 that is reciprocally slidable along the central axis of the first chamber 301. The first sealing component 302 divides the first chamber 301 into a first hydraulic oil chamber 3011 and a first nitrogen chamber 3012 that are independent of each other. The first hydraulic oil chamber 3011 is connected to the oil inlet channel 101, and the first nitrogen chamber 3012 is filled with nitrogen through the first gas filling component 303.

[0040] The second energy storage mechanism 40 is used to absorb the impact force in the return oil channel 102 through buffering. The second energy storage mechanism 40 includes a second chamber 401 disposed in the cylinder 20 of the hydraulic hammer 10 and a second sealing assembly 402 that slides back and forth along the central axis of the second chamber 401. The second sealing assembly 402 divides the first chamber 301 into a second hydraulic oil chamber 4011 and a second nitrogen chamber 4012 that are independent of each other. The second hydraulic oil chamber 4011 is connected to the return oil channel 102. The second nitrogen chamber 4012 is filled with nitrogen through the second gas filling assembly 403. The first chamber 301 and the second chamber 401 are not connected.

[0041] In this embodiment, a first chamber 301 and a second chamber 401, connected to the oil inlet channel 101 and the oil return channel 102, are provided inside the cylinder 20 of the hydraulic hammer 10. When the hydraulic hammer 10 is working, the hydraulic oil in the oil inlet and return channels drives the core of the hydraulic hammer 10 to reciprocate up and down, giving the hydraulic oil a certain impact force. Under the action of the impact force, the first sealing component 302 and the second sealing component 402 are pushed towards the first nitrogen chamber 3012 and the second nitrogen chamber 4012, compressing the nitrogen gas filled therein. Thus, the impact energy of the hydraulic oil is absorbed by the nitrogen gas compression, effectively reducing the vibration force of the hydraulic oil pipe and improving the service life of the hydraulic oil pipe and related accessories. At the same time, the independent first chamber 301 and the second chamber 401 avoid mutual interference between the two energy storage mechanisms, ensuring that each buffers the impact force of the oil inlet and return, further improving the stability of the hydraulic system.

[0042] Please refer to Figures 1-4 As shown, the first sealing assembly 302 includes a first piston 3021 that reciprocates along the axial direction of the first chamber 301 and a first sealing ring 3022 embedded on the outer periphery of the first piston 3021; ​​the second sealing assembly 402 includes a second piston 4021 that reciprocates along the axial direction of the second chamber 401 and a second sealing ring 4022 embedded on the outer periphery of the second piston 4021.

[0043] It should be noted that in this embodiment, the first piston 3021 and the second piston 4021 are both made of metal, silicon-based or plastic materials, wherein the metal includes but is not limited to copper, iron, aluminum, etc.; the first sealing ring 3022 and the second sealing ring 4022 are both made of polyurethane, fluororubber or nitrile rubber.

[0044] Please refer to Figures 1-4 As shown, in this embodiment, the diameter of the first chamber 301 is larger than the diameter of the oil inlet channel 101, and the diameter of the second chamber 401 is larger than the diameter of the oil return channel 102.

[0045] Understandably, when hydraulic oil flows into the first chamber 301 and the second chamber 401 with larger cross-sections, the flow rate of the hydraulic oil will be significantly reduced due to the increased buffer volume. The impact force of the hydraulic oil is initially attenuated, and compared with the same diameter, the instantaneous impact force of the hydraulic oil on the first piston 3021 and the second piston 4021 is significantly reduced, further improving the stability of the hydraulic system.

[0046] Please refer to Figures 1-5 As shown, in this embodiment, the central axes of the first chamber 301 and the second chamber 401 are perpendicular to the central axes of the oil inlet channel 101 and the oil return channel 102, respectively. Alternatively, the central axes of the first chamber 301 and the second chamber 401 coincide with the central axes of the oil inlet channel 101 and the oil return channel 102, respectively.

[0047] It is understood that in this embodiment, the absorption of hydraulic oil impact force is achieved by the compression of nitrogen gas by the first piston 3021 and the second piston 4021. Therefore, theoretically, as long as the oil inlet pipe and the oil return pipe can be connected to the first hydraulic oil chamber 3011 and the second hydraulic oil chamber 4011, the impact force of the hydraulic oil can be transmitted to the first piston 3021 and the second piston 4021.

[0048] Please refer to Figure 3 As shown, the first inflation assembly 303 includes a first plug 3031 fixedly disposed in the first chamber 301 and having a first inflation hole 30311 communicating with the first nitrogen chamber 3012. The first plug 3031 has a first inflation plug 3032 communicating with the first inflation hole 30311 for filling with nitrogen on the side away from the first nitrogen chamber 3012.

[0049] Please refer to Figure 4 As shown, the second inflation assembly 403 includes a second plug 4031 fixedly disposed in the second chamber 401 and having a second inflation hole 40311 communicating with the second nitrogen chamber 4012. The side of the second plug 4031 away from the second nitrogen chamber 4012 is provided with a second inflation plug 4032 communicating with the second inflation hole 40311 for filling with nitrogen.

[0050] It should be noted that the functions of the first inflation component 303 and the second inflation component 403 are to improve the convenience of nitrogen filling in the first nitrogen chamber 3012 and the second nitrogen chamber 4012, and at the same time, to ensure the sealing performance of the inflation port, ensure the sealing of the first nitrogen chamber 3012 and the second nitrogen chamber 4012 during use, ensure the pressure stability of the nitrogen chamber, and avoid the impact of pressure fluctuations on the performance of the energy storage mechanism.

[0051] Furthermore, the nitrogen pressure in the first nitrogen chamber 3012 and the second nitrogen chamber 4012 can be controlled by the first inflation component 303 and the second inflation component 403. The nitrogen pressure can be adjusted according to the working requirements of the hydraulic system, thereby ensuring the buffering effect of the first energy storage mechanism 30 and the second energy storage mechanism 40.

[0052] Therefore, this application does not specifically limit the structure of the first inflation component 303 and the second inflation component 403, as long as nitrogen can be filled while preventing nitrogen leakage.

[0053] Please refer to Figure 6 As shown, a buffer spring 60 is provided in the first nitrogen chamber 3012 and the second nitrogen chamber 4012. In this embodiment, the spring 60 is positioned between the first piston 3021 (second piston 4021) and the first plug 3031 (second plug 4031). To ensure the stability of the buffering effect of the spring 60 on the first piston 3021 and the second piston 4021, in this embodiment, one end of the spring 60 is fixed to the first plug 3031 (second plug 4031), and the other end is a free end.

[0054] It can be understood that in this embodiment, when the piston moves under impact, the spring 60 is compressed, providing additional elastic force. This, together with the pressure of nitrogen, enhances the buffering capacity of the energy storage mechanism. Especially when the impact force is small, the spring 60 can restore the piston position more quickly, improving the response speed of the energy storage mechanism.

[0055] Meanwhile, the spring 60 has a simple structure, low cost, and is easy to maintain. It has high reliability and can maintain stable buffering performance during long-term operation.

[0056] Please refer to Figure 7 As shown, the first nitrogen chamber 3012 and the second nitrogen chamber 4012 are provided with airbags 50 for cushioning.

[0057] In this embodiment, the airbag 50 mainly includes a bladder made of elastic material and an inflation valve for easy nitrogen injection. The elastic material can be made of rubber. Since both the first nitrogen chamber 3012 and the second nitrogen chamber 4012 are cylindrical in this embodiment, the airbag 50 can be elliptical or cylindrical. To ensure that the airbag 50 can be cushioned by deformation when subjected to pressure from the first piston 3021 (second piston 4021), in this embodiment, the upper and lower ends of the airbag 50 are in contact with the first piston 3021 (second piston 4021) and the first plug 3031 (second plug 4031), and a deformation space is left between the airbag 50 and the first nitrogen chamber 3012 (second nitrogen chamber 4012) in the circumferential direction.

[0058] To prevent the airbag 50 from blocking the first inflation port 30311 (second inflation port 40311), in this embodiment, the first inflation component 303 and the second inflation component 403 can both be set at the edge of the first plug 3031 (second plug 4031) so as to fill the first nitrogen chamber 3012 (second nitrogen chamber 4012) with nitrogen.

[0059] It is understood that in this embodiment, the airbag 50 has good elasticity and flexibility, which can provide additional buffering when nitrogen is compressed and expanded, further improving the buffering performance of the energy storage mechanism. Especially for high-frequency or large-amplitude impacts, the airbag 50 can better absorb and mitigate impact energy.

[0060] The above description is a specific implementation of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A hydraulic hammer with a built-in piston accumulator, characterized in that, include: The hydraulic hammer (10) includes a cylinder (20) and an oil inlet channel (101) and an oil return channel (102) arranged along the central axis of the hydraulic hammer (10); A first energy storage mechanism (30) is used to absorb the impact force in the oil inlet channel (101) through a buffering effect. The first energy storage mechanism (30) includes a first chamber (301) disposed in the cylinder (20) of the hydraulic hammer (10) and a first sealing assembly (302) that is reciprocally slidably disposed along the central axis of the first chamber (301). The first sealing assembly (302) divides the first chamber (301) into a first hydraulic oil chamber (3011) and a first nitrogen chamber (3012) that are independent of each other. The first hydraulic oil chamber (3011) is connected to the oil inlet channel (101), and the first nitrogen chamber (3012) is filled with nitrogen through the first gas filling assembly (303). The second energy storage mechanism (40) is used to absorb the impact force in the return oil channel (102) through buffering. The second energy storage mechanism (40) includes a second chamber (401) disposed in the cylinder (20) of the hydraulic hammer (10) and a second sealing assembly (402) that slides back and forth along the central axis of the second chamber (401). The second sealing assembly (402) divides the first chamber (301) into a second hydraulic oil chamber (4011) and a second nitrogen chamber (4012) that are independent of each other. The second hydraulic oil chamber (4011) is connected to the return oil channel (102). The second nitrogen chamber (4012) is filled with nitrogen through the second gas filling assembly (403). The first chamber (301) and the second chamber (401) are not connected.

2. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The diameter of the first chamber (301) is larger than the diameter of the oil inlet channel (101), and the diameter of the second chamber (401) is larger than the diameter of the oil return channel (102).

3. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The central axes of the first chamber (301) and the second chamber (401) are perpendicular to the central axes of the oil inlet channel (101) and the oil return channel (102), respectively.

4. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The central axes of the first chamber (301) and the second chamber (401) coincide with the central axes of the oil inlet channel (101) and the oil return channel (102), respectively.

5. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The first nitrogen chamber (3012) and the second nitrogen chamber (4012) are provided with airbags (50) for cushioning.

6. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The first nitrogen chamber (3012) and the second nitrogen chamber (4012) are provided with springs (60) for cushioning.

7. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The first sealing assembly (302) includes a first piston (3021) that reciprocates along the axial direction of the first chamber (301) and a first sealing ring (3022) embedded on the outer periphery of the first piston (3021); The second sealing assembly (402) includes a second piston (4021) that reciprocates along the axial direction of the second chamber (401) and a second sealing ring (4022) embedded on the outer periphery of the second piston (4021).

8. The hydraulic hammer with a built-in piston accumulator according to claim 7, characterized in that, The first piston (3021) and the second piston (4021) are both made of metal, silicon-based or plastic material; the first sealing ring (3022) and the second sealing ring (4022) are both made of polyurethane, fluororubber or nitrile rubber.

9. The hydraulic hammer with a built-in piston accumulator according to claim 1, characterized in that, The first inflation assembly (303) includes a first plug (3031) fixedly disposed in the first chamber (301) and having a first inflation hole (30311) communicating with the first nitrogen chamber (3012). The first plug (3031) has a first inflation plug (3032) on the side away from the first nitrogen chamber (3012) communicating with the first inflation hole (30311) for filling with nitrogen. The second inflation assembly (403) includes a second plug (4031) fixedly disposed in the second chamber (401) and having a second inflation hole (40311) communicating with the second nitrogen chamber (4012). The second plug (4031) has a second inflation plug (4032) on the side away from the second nitrogen chamber (4012) that communicates with the second inflation hole (40311) for filling with nitrogen.

Images