Energy accumulator applied to breaking hammer

Abstract

The utility model provides an energy accumulator applied to a breaking hammer, and belongs to the technical field of mechanical equipment. The energy accumulator solves the problem that an energy accumulator used in an existing breaking hammer is short in service life. The energy accumulator applied to the breaking hammer comprises a rear cylinder body connected with the breaking hammer, and is characterized in that a gas storage cavity, an energy storage channel and an oil return channel communicated with the breaking hammer are formed in the rear cylinder body, the right side of the energy storage channel is communicated with the oil return channel, and the left side of the energy storage channel is communicated with the gas storage cavity; the energy storage channel is provided with a piston capable of moving in a reciprocating mode along the energy storage channel, gas in the gas storage cavity keeps a certain pressure intensity, when the pressure intensity in the oil return channel is larger than that in the gas storage cavity, the piston moves towards the left side, and when the air pressure in the oil return channel is smaller than that in the gas storage cavity, the piston moves towards the right side. The service life of the energy accumulator applied to the breaking hammer is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical equipment, and in particular relates to an accumulator used for a breaking hammer. Background Art

[0002] A hydraulic breaker is a machine that can convert hydraulic energy into mechanical energy to perform work. It is mainly used for crushing, demolishing, excavating hard layers, etc. It is usually installed on excavators, loaders or power stations. Traditional hydraulic breakers generally include a hydraulic-pneumatic system. Usually, this system has a high-pressure accumulator in the oil inlet channel. The accumulator is used to store energy in the hydraulic-pneumatic system. It converts the energy in the system into compressed energy and stores it at the right time. When the system needs it, it converts the compressed energy into hydraulic energy and releases it to replenish the system. At the same time, when the system pressure increases instantly, it can absorb this part of the energy to ensure the stability of the pressure of the entire system.

[0003] For example, the Chinese patent authorization announcement number: CN216041434U discloses a hydraulic breaker with multiple accumulators. The breaker is equipped with an accumulator, which can absorb the large oil pressure generated instantly in the oil return chamber during oil return, and reduce the peak oil pressure in the oil return chamber. The accumulator adopts a leather cup structure. When the breaker is working, the leather cup in the accumulator will deform frequently. The leather cup is prone to fatigue damage during repeated deformation, which increases the user's cost of use. Summary of the invention

[0004] The purpose of the utility model is to solve the above problems in the prior art and to propose an accumulator for a breaker. The technical problem to be solved by the utility model is: how to improve the service life of the accumulator.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] An accumulator used for a breaker hammer comprises a rear cylinder body connected to the breaker hammer, characterized in that an air storage chamber, an energy storage channel and an oil return channel connected to the breaker hammer are provided on the rear cylinder body, the right side of the energy storage channel is connected to the oil return channel, and the left side is connected to the air storage chamber, the energy storage channel is provided with a piston that can reciprocate along the energy storage channel, the gas in the air storage chamber maintains a certain pressure, when the pressure in the oil return channel is greater than the pressure in the air storage chamber, the piston moves to the left, and when the air pressure in the oil return channel is less than the pressure in the air storage chamber, the piston moves to the right.

[0007] This accumulator is installed on the breaker. The oil return passage on the accumulator is connected to the oil return cavity of the breaker. When the oil pressure in the oil return cavity suddenly increases, the oil in the oil return cavity will enter the oil return passage. The gas storage cavity in the accumulator has a certain air pressure. The air pressure in the gas storage cavity enters the energy storage passage and acts on the piston. When the oil pressure in the oil return cavity increases and the oil enters the energy storage passage, the oil will also act on the piston. When the pressure in the oil return passage is greater than the pressure in the gas storage cavity, the piston moves to the left. When the air pressure in the oil return passage is less than the pressure in the gas storage cavity, the piston moves to the right. The capacity of the oil in the energy storage passage is adjusted by the reciprocating movement of the piston in the accumulator to absorb the instantaneous excessive oil pressure. Compared with the frequent deformation of the leather cup, the fatigue strength of the reciprocating movement of the piston is greatly increased, and it has a longer service life compared with the accumulator on the breaker in the prior art.

[0008] In the accumulator applied to the breaker as described above, a vent hole communicating with the gas storage cavity is provided on the inner wall of the energy storage passage. When the piston moves to the left to its maximum stroke, the vent hole is blocked by the piston. When the oil pushes the piston to move to the maximum stroke and the air hole is blocked by the piston, it can prevent the gas in the gas storage cavity from entering the oil return passage, making this accumulator have both long service life and reliability in use.

[0009] In the accumulator applied to the breaker as described above, an oil seal groove and a gas seal groove are spaced from left to right on the piston. Sealing rings are provided in the oil seal groove and the gas seal groove. When the piston moves to the left to its maximum stroke, the vent hole is located on the left side of the gas seal groove. When the piston moves to the left to its maximum stroke and the vent hole is located on the left side of the gas seal groove, it can further ensure the reliability of this accumulator in use and prevent gas from entering the oil return passage.

[0010] In the accumulator applied to the breaker as described above, at least two oil seal grooves are provided on the piston from left to right.

[0011] In the accumulator applied to the breaker as described above, a limiting step surface is provided in the energy storage passage. The limiting step surface is located on the side close to the oil return passage. When the air pressure in the oil return passage is less than the pressure in the gas storage cavity, the piston can abut against the limiting step surface. The gas in the gas storage cavity acts on the piston, causing the end face of the piston to abut against the limiting step surface. At this time, the end face of the piston is pressed against the limiting step surface, thereby preventing gas from entering the oil return passage.

[0012] In the accumulator applied to the breaker as described above, an inflation hole communicating with the gas storage cavity is provided on the rear cylinder body. The inflation hole provided on the rear cylinder body can adjust the air pressure in the gas storage cavity according to the use environment during the use process.

[0013] In the accumulator applied to the breaker described above, the energy storage channel penetrates through the outer surface of the rear cylinder block to form a through hole, and a plugging block is detachably connected in the through hole.

[0014] In the accumulator applied to the breaker described above, an elastic buffer portion is provided at one end of the plugging block facing the piston. When the oil pressure in the oil return channel is too high, the elastic buffer portion on the plugging block can buffer the piston, improving the service life of the accumulator.

[0015] In the accumulator applied to the breaker described above, the oil return channel has an opening one on the rear cylinder block, and the gas storage cavity has an opening two on the rear cylinder block. The through hole, the opening one, and the opening two are all located on the same side of the rear cylinder block. When installing this accumulator on the breaker, there are corresponding bosses on the breaker that can cooperate with the opening one and the opening two, enabling the sealing of the gas storage cavity and the connection between the oil return channel and the oil return cavity on the breaker through one assembly step, and pressing the outer end face of the plugging block located on the through hole against the breaker, simplifying the installation steps.

[0016] In the accumulator applied to the breaker described above, the end face area of the end of the piston in contact with the gas in the gas storage cavity is larger than the end face area of the end of the piston in contact with the oil. The end face of the piston in contact with the oil can be located in the oil return channel. When the oil pressure in the oil return channel is at the normal value, the end face of the piston in contact with the oil can be located in the oil return channel. Due to the different area sizes at both ends of the piston, when the pressure in the oil return channel increases, the force on the piston in the oil return channel is greater than the pressure on the gas storage chamber side, enabling a faster response to the pressure change in the oil return channel and moving the piston to the left.

[0017] And the end face of the piston in contact with the oil can be located in the oil return channel

[0018] Compared with the prior art, the accumulator applied to the breaker has the following advantages:

[0019] By using the reciprocating movement of the piston to adjust the size of the space available for the oil to accommodate in the energy storage channel, compared with the leather cup structure of the traditional accumulator, the service life of the accumulator can be significantly improved. Description of the Drawings

[0020] Figure 1 It is the front view of the accumulator.

[0021] Figure 2 It is the A - A cross-sectional view of the accumulator.

[0022] Figure 3 It is the B - B cross-sectional view of the accumulator.

[0023] Figure 4 It is the B - B cross-sectional view of the accumulator when the piston abuts against the elastic buffer portion.

[0024] Figure 5 is Figure 4 the partial enlarged view I of

[0025] Figure 6 is the B - B cross - sectional view of the accumulator in Embodiment 2.

[0026] In the figure, 1. Rear cylinder block; 2. Gas storage cavity; 2a. Opening 2; 3. Energy storage channel; 3a. Through hole; 4. Oil return channel; 4a. Opening 1; 5. Piston; 5a. Oil seal groove; 5b. Gas seal groove; 6. Vent hole; 7. Sealing ring; 8. Limit step surface; 9. Inflation hole; 10. Plugging block; 10a. Elastic buffer part. Specific embodiments

[0027] The following are specific embodiments of the present invention and in combination with the attached drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0028] For the convenience of describing the structure in the accumulator, the left - right direction in this embodiment does not determine the orientation in the actual use process.

[0029] Embodiment 1

[0030] As Figures 1 to 4 shown, the accumulator applied to a breaker includes a rear cylinder block 1. A gas storage cavity 2, an energy storage channel 3 and an oil return channel 4 connected to the breaker are opened on the rear cylinder block 1. The right side of the energy storage channel 3 is connected to the oil return channel 4, and the left side of the energy storage channel 3 is connected to the gas storage cavity 2. The gas in the gas storage cavity 2 maintains a certain pressure. A piston 5 is arranged in the energy storage channel 3. The gas in the gas storage cavity 2 enters the energy storage channel 3 and acts on the piston 5, which can move the piston 5 to the right. The oil in the oil return channel 4 enters the energy storage channel 3 and acts on the piston 5, which can move the piston 5 to the left.

[0031] The rear cylinder block 1 is connected to the breaker, and the oil return channel 4 on the accumulator is connected to the oil return cavity of the breaker. When the pressure in the oil return channel 4 is greater than the pressure in the gas storage cavity 2, the piston 5 moves to the left. When the pressure in the oil return channel 4 is less than the pressure in the gas storage cavity 2, the piston 5 moves to the right; in the accumulator, the capacity of the oil in the energy storage channel 3 is adjusted by the reciprocating movement of the piston 5 to absorb the transient excessive oil pressure; under normal working conditions, the pressure in the gas storage cavity 2 is always greater than the oil pressure in the oil return channel 4. Compared with the frequent deformation of the leather cup, the fatigue strength of the reciprocating movement of the piston 5 is greatly increased, and compared with the accumulator on the breaker in the prior art, it has a longer service life.

[0032] Further, an air vent hole 6 communicating with the air storage cavity 2 is formed in the rear cylinder block 1, so that gas enters the energy storage channel 3 through the air vent hole 6. When the oil in the oil return channel 4 pushes the piston 5 to the left to the maximum position, the air vent hole 6 is blocked by the piston 5, preventing the gas in the air storage cavity 2 from entering the oil return channel 4.

[0033] Further, Figure 5 As shown, two oil seal grooves 5a and one air seal groove 5b are formed in the piston 5 at intervals from left to right. Sealing rings 7 are provided in both the oil seal grooves 5a and the air seal groove 5b. When the piston 5 moves to the left by the maximum stroke, the air vent hole 6 is located on the left side of the air seal groove 5b, thus preventing the gas from affecting the air seal groove 5b. Figure 5 In this case, the air vent hole 6 is opposite to the middle oil seal groove 5a. However, most preferably, when the piston 5 moves to the left by the maximum stroke, the air vent hole 6 is located between the two oil seal grooves 5a.

[0034] Further, as Figure 2 and Figure 3 shown, a limiting step surface 8 is provided in the energy storage channel 3, and the limiting step surface 8 is located on the side close to the oil return channel 4. When the air pressure in the oil return channel 4 is less than the pressure in the air storage cavity 2, the piston 5 can abut against the limiting step surface 8. The gas in the air storage cavity 2 acts on the piston 5, causing the end surface of the piston 5 to abut against the limiting step surface 8. At this time, the end surface of the piston 5 is pressed against the limiting step surface 8, thereby preventing the gas from entering the oil return channel 4.

[0035] Further, as Figure 2 and Figure 3 shown, an inflation hole 9 communicating with the air storage cavity 2 is formed in the rear cylinder block 1. During use, the air pressure in the air storage cavity 2 is adjusted according to the use environment. The inflation hole 9 is blocked by a plug to ensure the air pressure in the air storage cavity 2.

[0036] Further, as Figures 3 to 5 shown, the energy storage channel 3 penetrates through the outer surface of the rear cylinder block 1 to form a through hole 3a, and a plugging block 10 is detachably connected in the through hole 3a. The plugging block 10 is located at the end of the energy storage channel 3. When the piston 5 or the sealing ring 7 needs to be replaced, the plugging block 10 can be removed and then the piston 5 can be taken out.

[0037] Preferably, as Figure 5 shown, an elastic buffer portion 10a is provided at one end of the plugging block 10 facing the piston 5. When the oil pressure in the oil return channel 4 is too high, the elastic buffer portion 10a on the plugging block 10 can buffer the piston 5, improving the service life of the accumulator.

[0038] As Figure 1As shown, the oil return passage 4 has an opening 4a on the rear cylinder block 1, and the air storage chamber 2 has an opening 2a on the rear cylinder block 1. The through hole 3a, the opening 4a, and the opening 2a are all located on the same side of the rear cylinder block 1. Sealing rings for cooperating with the breaker are provided on both the opening 4a and the opening 2a. When this accumulator is installed on the breaker, there are corresponding bosses on the breaker that can cooperate with the sealing rings on the opening 4a and the opening 2a, enabling the air storage chamber 2 to be sealed and the connection between the oil return passage 4 and the oil return chamber on the breaker to be sealed through one assembly step. The outer end face of the plugging block 10 located on the through hole 3a is abutted against the breaker, thereby further preventing the plugging block 10 from loosening and coming off under the impact of the piston 5. The above-mentioned sealing rings can be pre-assembled on the rear cylinder block or pre-assembled on the breaker, and are selected according to actual process requirements.

[0039] Embodiment 2

[0040] This embodiment is substantially the same as Embodiment 1, and the difference is that in this embodiment, the end face area of the end of the piston in contact with the gas in the air storage chamber is larger than the end face area of the end of the piston in contact with the oil. The end face of the piston in contact with the oil can be located in the oil return passage. When the oil pressure in the oil return passage is at the normal value, the end face of the piston in contact with the oil can be located in the oil return passage. Due to the different areas of the two ends of the piston, when the pressure in the oil return passage increases, the force on the piston in the oil return passage is greater than the pressure on the air storage chamber side, and the pressure change in the oil return passage can be reflected faster, moving the piston to the left.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An accumulator for a breaker hammer, comprising a rear cylinder (1) connected to the breaker hammer, characterized in that: The rear cylinder body (1) is provided with an air storage chamber (2), an energy storage channel (3) and an oil return channel (4) connected to the breaker. The right side of the energy storage channel (3) is connected to the oil return channel (4), and the left side is connected to the air storage chamber (2). The energy storage channel (3) is provided with a piston (5) capable of reciprocating along the energy storage channel (3). The gas in the air storage chamber (2) maintains a certain pressure. When the pressure in the oil return channel (4) is greater than the pressure in the air storage chamber (2), the piston (5) moves to the left. When the air pressure in the oil return channel (4) is less than the pressure in the air storage chamber (2), the piston (5) moves to the right.

2. The accumulator used for a breaker hammer according to claim 1, characterized in that: The inner wall of the energy storage channel (3) is provided with a vent hole (6) communicating with the gas storage chamber (2); when the piston (5) moves to the left at its maximum stroke, the vent hole (6) is shielded by the piston (5).

3. The accumulator used for a breaking hammer according to claim 2, characterized in that: An oil seal groove (5a) and an air seal groove (5b) are provided on the piston (5) from left to right at intervals, and a sealing ring (7) is provided in the oil seal groove (5a) and the air seal groove (5b). When the piston (5) moves to the left to a maximum stroke, the vent hole (6) is located on the left side of the air seal groove (5b).

4. The accumulator used for a breaking hammer according to claim 3, characterized in that: At least two oil seal grooves (5a) are provided on the piston (5) from left to right.

5. The accumulator used for a breaking hammer according to claim 1, 2, 3 or 4, characterized in that: A limiting step surface (8) is provided in the energy storage channel (3), and the limiting step surface (8) is located on a side close to the oil return channel (4). When the air pressure in the oil return channel (4) is lower than the pressure in the air storage chamber (2), the piston (5) can abut against the limiting step surface (8).

6. The accumulator used for a breaking hammer according to claim 1, 2, 3 or 4, characterized in that: The rear cylinder body (1) is provided with an air charging hole (9) which is in communication with the air storage chamber (2).

7. The accumulator used for a breaking hammer according to claim 1, characterized in that: The energy storage channel (3) penetrates the outer surface of the rear cylinder body (1) to form a through hole (3a), and a wire blocking block (10) is detachably connected to the through hole (3a).

8. The accumulator used for a breaking hammer according to claim 7, characterized in that: An elastic buffer portion (10a) is provided at one end of the thread blocking block (10) facing the piston (5).

9. The accumulator used for a breaking hammer according to claim 7, characterized in that: The oil return passage (4) has an opening 1 (4a) on the rear cylinder body (1), the air storage chamber (2) has an opening 2 (2a) on the rear cylinder body (1), and the through hole (3a), the opening 1 (4a) and the opening 2 (2a) are all located on the same side of the rear cylinder body (1).

10. The accumulator used for a breaking hammer according to claim 1, 2, 3, 7, 8 or 9, characterized in that: The end surface area of ​​the piston (5) in contact with the gas in the gas storage chamber (2) is greater than the end surface area of ​​the piston (5) in contact with the oil, and the end surface of the piston (5) in contact with the oil can be located in the oil return channel (4).

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