A hydraulic system fluid pressure actuator

Abstract

The present invention discloses a fluid pressure actuator for a hydraulic system, which relates to the technical field of fluid pressure actuation and includes: a cylinder block; a left end cover fixed to the left end of the cylinder block; a right end cover fixed to the right end of the cylinder block and corresponding to the left end cover; a piston adjusting device slidably disposed within the cylinder block; a connecting rod disposed on the central axis of the cylinder block, fixedly connected to the piston adjusting device, and slidably connected to the center of the right end cover; a buffer assembly having one end fixedly connected to the left end cover and the other end slidably disposed within the connecting rod. The present invention enables the thrust of the oil pressure on the piston to be more evenly distributed on the piston, effectively improving the smoothness of the piston movement. At the same time, under the change of oil pressure, it is transmitted step by step, effectively avoiding fatigue damage to the piston caused by rapid change of oil pressure, buffering the movement of the connecting rod, and enabling the connecting rod to move and reset smoothly within the cylinder block.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid pressure actuators, and more specifically, to a fluid pressure actuator for a hydraulic system. Background Art

[0002] Fluid drivers composed of drive cylinders and pistons are widely used in the field of engineering technology. Their conventional design is to alternately introduce pressurized fluid into both sides of the piston in the drive cylinder by means of a distribution valve, thereby pushing the external load body fixedly connected to the piston rod to move bidirectionally. A hydraulic cylinder is a type of fluid pressure actuator, which is mainly applied to some equipment with large load-bearing capacity. The hydraulic cylinder can provide stable power for these large-scale equipment and ensure the normal operation of construction operations. In actual use, during the buffering movement of the piston in the hydraulic cylinder, the force uniformity of the piston is poor, the movement smoothness of the piston is insufficient, and during the working process, affected by the self-weight of the hydraulic equipment, it is very difficult for the hydraulic cylinder to reset slowly, resulting in a large impact on the piston and the bottom wall of the cylinder of the hydraulic cylinder. Therefore, it is necessary to provide a fluid pressure actuator for a hydraulic system to solve the problems raised in the above background art. Summary of the Invention

[0003] To achieve the above object, the present invention provides the following technical solution: A fluid pressure actuator for a hydraulic system, comprising:

[0004] A cylinder block;

[0005] A left end cover, fixed to the left end of the cylinder block;

[0006] A right end cover, fixed to the right end of the cylinder block, corresponding to the left end cover;

[0007] A piston adjusting device, slidably arranged in the cylinder block;

[0008] A connecting rod, arranged on the central axis of the cylinder block, fixedly connected to the piston adjusting device, and slidably connected to the center of the right end cover;

[0009] A buffer assembly, one end fixedly connected to the left end cover, and the other end slidably arranged inside the connecting rod.

[0010] Further, as a preference, a first oil port is provided on the side of the left end cover, a second oil port is provided on the side of the right end cover, and the first oil port and the second oil port are respectively communicated with both ends of the cylinder block and an external oil tank.

[0011] Further, as a preference, the piston adjusting device includes:

[0012] A central connecting member, slidably arranged in the cylinder block, and the side of the central connecting member close to the right end cover is fixedly connected to the connecting rod;

[0013] The first piston surface is slidably arranged in the cylinder body, on the left side of the central connecting piece, and the center of the first piston surface is slidably connected to the buffer assembly;

[0014] The second piston surface is slidably arranged in the cylinder body, corresponding to the first piston surface, on the right side of the central connecting piece, and the center of the second piston surface is slidably connected to the connecting rod;

[0015] Two sets of multi-stage buffer mechanisms are symmetrically distributed about the central connecting piece, respectively fixed on both sides of the central connecting piece, and the multi-stage buffer mechanisms are respectively in contact with the corresponding first piston surface and second piston surface.

[0016] Further, as a preference, the central connecting piece includes:

[0017] The connecting circular surface is arranged in the cylinder body, the center on the side close to the right end cover is fixedly connected to the connecting rod, and both sides of the connecting circular surface are respectively fixedly connected to the corresponding multi-stage buffer mechanisms;

[0018] The sealing ring is fixed on the outer ring of the connecting circular surface, and the sealing ring is slidably connected to the inner wall of the cylinder body.

[0019] Further, as a preference, the multi-stage buffer mechanism includes:

[0020] The outer compression assembly, one end is fixedly connected to the side surface of the connecting circular surface, and the other end is in contact with the piston surface;

[0021] The inner compression assemblies are arranged in multiple numbers in sequence from the outside to the center of the connecting circular surface, and the inner compression assemblies are arranged inside the outer compression assembly. One end of the inner compression assembly is fixedly connected to the side surface of the connecting circular surface, and the other end corresponds to the piston surface, and the inner compression assembly and the outer compression assembly have the same structure.

[0022] Further, as a preference, the compression assembly includes:

[0023] The fixed ring surface is fixed on the side part of the connecting circular surface;

[0024] The compression spring is fixed on the side away from the connecting circular surface of the fixed ring surface;

[0025] The connecting ring surface is fixed at the end of the compression spring away from the fixed ring surface, and the connecting ring surface corresponds to the side part of the piston surface;

[0026] The spacer ring surface is fixed on the inner ring of the connecting ring surface, and the spacer ring surface is in contact with the adjacent compression assemblies;

[0027] The pushing ring surface is fixed in the middle of the inner side of the spacer ring surface, and is parallel to the connecting ring surface in the adjacent compression assemblies.

[0028] Further, as a preference, the compression degrees of the plurality of compression springs decrease successively from the outside to the center of the connecting circular surface, and during the compression process of the compression springs, each pushing ring surface must be in contact with the corresponding connecting ring surface.

[0029] Further, as a preference, the buffer assembly includes:

[0030] A limit rod, one end of which is fixedly connected to the left end cover, and the other end passes through the first piston surface and the central connecting member and is arranged in the connecting rod;

[0031] A positioning slider, fixed to one end of the limit rod located in the connecting rod, and the positioning slider is slidably arranged inside the connecting rod;

[0032] A buffer spring, sleeved on the limit rod and located inside the connecting rod, and fixedly connected to the side of the positioning slider.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] In the present invention, through the setting of the piston adjusting device, when the pressure of the hydraulic oil changes and the piston pushes the connecting rod, under the action of the multi-stage buffer mechanism, before the hydraulic oil pressure pushes the connecting rod to move, the thrust of the oil pressure on the piston is more evenly distributed on the piston, effectively improving the smoothness of the piston movement. At the same time, under the action of the piston adjusting device, the oil pressure on both sides of the piston is transmitted. When the oil pressure changes, it is transmitted step by step through the multi-stage buffer mechanism, effectively avoiding fatigue damage to the piston caused by rapid changes in oil pressure; through the setting of the buffer assembly, the movement of the connecting rod is buffered, so that the connecting rod moves and resets smoothly in the cylinder body. Description of the Drawings

[0035] Figure 1 It is a schematic diagram of the overall structure of a fluid pressure actuator of a hydraulic system;

[0036] Figure 2 It is a schematic diagram of the structure of the piston adjusting device;

[0037] Figure 3 It is a schematic diagram of the structure of the central connecting member and the multi-stage buffer mechanism;

[0038] Figure 4 It is a schematic diagram of the structure of the compression spring assembly;

[0039] Figure 5 It is a schematic diagram of the structure of the buffer assembly;

[0040] In the figure: 1. Cylinder block; 2. Left end cover; 3. Right end cover; 4. Piston adjusting device; 5. Connecting rod; 6. Buffer assembly; 21. First oil port; 31. Second oil port; 41. Central connecting piece; 42. First piston surface; 43. Second piston surface; 44. Multi-stage buffer mechanism; 61. Limit rod; 62. Positioning slider; 63. Buffer spring; 411. Connecting circular surface; 412. Sealing ring; 441. Outer compression assembly; 442. Inner compression assembly; 4411. Fixed ring surface; 4412. Compression spring; 4413. Connecting ring surface; 4414. Spacing ring surface; 4415. Pushing ring surface. Detailed implementation mode

[0041] Please refer to Figures 1 to 5 , in the embodiment of the present invention, a hydraulic system fluid pressure actuator includes:

[0042] Cylinder block 1;

[0043] Left end cover 2, fixed to the left end of the cylinder block 1;

[0044] Right end cover 3, fixed to the right end of the cylinder block 1, corresponding to the left end cover 2;

[0045] Piston adjusting device 4, slidably arranged in the cylinder block 1;

[0046] Connecting rod 5, arranged on the central axis of the cylinder block 1, fixedly connected to the piston adjusting device 4, and slidably connected to the center of the right end cover 3;

[0047] Buffer assembly 6, one end fixedly connected to the left end cover 2, and the other end slidably arranged inside the connecting rod 5.

[0048] In this embodiment, a first oil port 21 is provided on the side of the left end cover 2, a second oil port 31 is provided on the side of the right end cover 3, and the first oil port 21 and the second oil port 31 are respectively communicated with both ends of the cylinder block 1 and an external oil tank.

[0049] That is to say, under the action of the first oil port 21, the space between the external fuel tank and the left end cover 2 and the piston adjustment device 4 in the cylinder block 1 is connected. By controlling the oil pressure input to the first oil port 21, pressure is applied to the left side of the piston adjustment device 4, driving the piston adjustment device 4 and the connecting rod 5 to move in the direction of the right end cover 3; under the action of the second oil port 31, the space between the external fuel tank and the right end cover 3 and the piston adjustment device 4 in the cylinder block 1 is connected. By controlling the oil pressure input to the second oil port 31, pressure is applied to the right side of the piston adjustment device 4, driving the piston adjustment device 4 and the connecting rod 5 to move in the direction of the left end cover 2; when the oil pressure input to the first oil port 21 is greater than the oil pressure input to the second oil port 31, under the action of the oil pressure, the piston adjustment device 4 and the connecting rod 5 move in the direction of the right end cover 3; when the oil pressure input to the first oil port 21 is less than the oil pressure input to the second oil port 31, under the action of the oil pressure, the piston adjustment device 4 and the connecting rod 5 move in the direction of the left end cover 2 to control the position of the connecting rod 5.

[0050] In this embodiment, the piston adjustment device 4 includes:

[0051] A central connecting member 41, which is slidably arranged in the cylinder block 1, and the side of the central connecting member 41 close to the right end cover 3 is fixedly connected to the connecting rod 5;

[0052] A first piston surface 42, which is slidably arranged in the cylinder block 1, is located on the left side of the central connecting member 41, and the center of the first piston surface 42 is slidably connected to the buffer assembly 6;

[0053] A second piston surface 43, which is slidably arranged in the cylinder block 1, is arranged corresponding to the first piston surface 42, is located on the right side of the central connecting member 41, and the center of the second piston surface 43 is slidably connected to the connecting rod 5;

[0054] Two sets of multi-stage buffer mechanisms 44 are symmetrically distributed about the central connecting member 41, are respectively fixed on both sides of the central connecting member 41, and the multi-stage buffer mechanisms 44 are respectively in contact with the corresponding first piston surface 42 and second piston surface 43.

[0055] That is to say, when the oil pressure input into the first oil port 21 is greater than the oil pressure input into the second oil port 31, that is, the pressure received by the first piston surface 42 is greater than the pressure received by the second piston surface 43, under the primary dispersion of the multi-stage buffer mechanism 44, the oil pressure is evenly distributed on the piston surface. Then, under the action of the oil pressure, the central connecting member 41 drives the connecting rod 5 to move smoothly in the direction of the right end cover 3, and the connecting rod 5 is pushed out; when the oil pressure input into the first oil port 21 is less than the oil pressure input into the second oil port 31, that is, the pressure received by the first piston surface 42 is less than the pressure received by the second piston surface 43, under the primary dispersion of the multi-stage buffer mechanism 44, the oil pressure is evenly distributed on the piston surface. Then, under the action of the oil pressure, the central connecting member 41 drives the connecting rod 5 to move in the direction of the left end cover 2, and the connecting rod 5 is retracted.

[0056] In this embodiment, the central connecting member 41 includes:

[0057] A connecting circular surface 411, which is arranged in the cylinder block 1, is fixedly connected to the connecting rod 5 at the center on the side close to the right end cover 3, and both sides of the connecting circular surface 411 are fixedly connected to the corresponding multi-stage buffer mechanisms 44;

[0058] A sealing ring 412, which is fixed on the outer ring of the connecting circular surface 411, and the sealing ring 412 is slidably connected to the inner wall of the cylinder block 1.

[0059] That is to say, the connecting circular surface 411 serves as the central fixed point of the multi-stage buffer mechanisms 44 on both sides. The pressures received by the first piston surface 42 and the second piston surface 43 are buffered and distributed by the multi-stage buffer mechanism 44, and finally converge at the connecting circular surface 411. According to the magnitudes of the oil pressures on both sides, the connecting circular surface 411 is pushed to move. Then, it slides on the inner wall of the cylinder block 1 through the sealing ring 412, and at the same time drives the connecting rod 5 to move and adjust on the cylinder block 1.

[0060] In this embodiment, the multi-stage buffer mechanism 44 includes:

[0061] An outer compression assembly 441, one end of which is fixedly connected to the side surface of the connecting circular surface 411, and the other end is in contact with the piston surface;

[0062] Inner compression assemblies 442, which are provided in multiple numbers in sequence from the outside to the center of the connecting circular surface 411, and the inner compression assemblies 442 are arranged inside the outer compression assembly 441. One end of the inner compression assemblies 442 is fixedly connected to the side surface of the connecting circular surface 411, and the other end corresponds to the piston surface. And the inner compression assemblies 442 and the outer compression assembly 441 have the same structure.

[0063] That is to say, when the piston surface is subjected to the pressure from the hydraulic oil, under the action of the oil pressure, the piston surface is pushed to compress the outer compression assembly 441, and the acting force of the oil pressure is gradually dispersed on the piston surface, and then the inner compression assembly 442 is compressed in turn, and the thrust of the oil pressure on the piston surface is gradually distributed more evenly on the piston surface, effectively improving the smoothness of the movement of the piston adjusting device 4, so that the piston surface pushes the central connecting member 41 to drive the connecting rod 5 to slide stably in the cylinder block 1.

[0064] In this embodiment, the compression assembly includes:

[0065] A fixed ring surface 4411, fixed on the side of the connecting circular surface 411;

[0066] A compression spring 4412, fixed on the side of the fixed ring surface 4411 away from the connecting circular surface 411;

[0067] A connecting ring surface 4413, fixed at one end of the compression spring 4412 away from the fixed ring surface 4411, and the connecting ring surface 4413 corresponds to the side of the piston surface;

[0068] An interval ring surface 4414, fixed on the inner ring of the connecting ring surface 4413, and the interval ring surface 4414 is in contact with the adjacent compression assembly;

[0069] A pushing ring surface 4415, fixed in the middle of the inner side of the interval ring surface 4414, and is parallel to the connecting ring surface 4413 in the adjacent compression assembly.

[0070] That is to say, when the piston surface moves towards the central connecting member 41 under the action of the oil pressure, the piston surface first pushes the connecting ring surface 4413 of the outer compression assembly 441, compresses the corresponding compression spring 4412. During the compression of the compression spring 4412, the connecting ring surface 4413 drives the corresponding interval ring surface 4414 and the pushing ring surface 4415 to move towards the connecting ring surface 4413 on the adjacent inner compression assembly 442. Then, under the action of the pushing ring surface 4415, the compression spring 4412 in the corresponding inner compression assembly 442 is compressed. As the piston surface moves, the compression springs 4412 in each inner compression assembly 442 are compressed in turn until the central connecting member 41 is pushed to move in the cylinder block 1. Under the action of the multi-stage compression assembly, not only the pressure exerted by the hydraulic oil on the piston surface is more evenly distributed, but also during the rapid adjustment of the oil pressure, the multi-stage buffering effectively avoids fatigue damage to the piston caused by the rapid change of the oil pressure.

[0071] In this embodiment, the compression degrees of the multiple compression springs 4412 decrease sequentially from the outside of the connecting circular surface 411 towards the center, and during the compression of the compression springs 4412, each pushing ring surface 4415 must be in contact with the corresponding connecting ring surface 4413.

[0072] That is to say, under the push of the oil pressure, a plurality of compression springs 4412 distributed on the central connecting member 41 are compressed in sequence, giving the central connecting member 41 sufficient reaction adjustment time, effectively avoiding fatigue damage to the piston caused by rapid changes in oil pressure. It should be noted that before the outer compression spring 4412 is compressed to the limit, the corresponding pushing ring surface 4415 of the compression spring 4412 must be in contact with the connecting ring surface 4413 in the adjacent compression assembly, so as to ensure that the plurality of compression springs 4412 can be buffered under the pushing action of the piston surface, gradually adjust the pressure exerted by the hydraulic oil on the piston surface, make the pressure exerted by the hydraulic oil on the piston surface more evenly distributed, and effectively improve the smoothness of the movement of the piston adjusting device 4 in the cylinder block 1.

[0073] In this embodiment, the buffer assembly 6 includes:

[0074] A limit rod 61, one end of which is fixedly connected to the left end cover 2, and the other end passes through the first piston surface 42 and the central connecting member 41 and is arranged in the connecting rod 5;

[0075] A positioning slider 62, which is fixed to one end of the limit rod 61 located in the connecting rod 5, and the positioning slider 62 is slidably arranged inside the connecting rod 5;

[0076] A buffer spring 63, which is sleeved on the limit rod 61 and is located in the connecting rod 5, and is fixedly connected to the side of the positioning slider 62.

[0077] That is to say, when the oil pressure input into the first oil port 21 is greater than the oil pressure input into the second oil port 31, that is, the pressure received by the first piston surface 42 is greater than the pressure received by the second piston surface 43, the central connecting member 41 drives the connecting rod 5 to move in the direction of the right end cover 3 on the limit rod 61. Under the buffering action of the buffer spring 63, the connecting rod 5 moves smoothly on the limit rod 61 and pushes the connecting rod 5 out, effectively preventing the piston adjusting device 4 from impacting the right end cover 3 when moving rapidly in the cylinder block 1 and damaging the piston surface; when the oil pressure input into the first oil port 21 is less than the oil pressure input into the second oil port 31, that is, the pressure received by the first piston surface 42 is less than the pressure received by the second piston surface 43, the central connecting member 41 drives the connecting rod 5 to move in the direction of the left end cover 2 on the limit rod 61 to reset. When the first piston surface 42 approaches the left end cover 2, under the buffering action of the buffer spring 63, the speed of the connecting rod 5 and the piston adjusting device 4 is reduced, effectively preventing the piston adjusting device 4 from impacting the left end cover 2 when moving rapidly to reset in the cylinder block 1 and damaging the piston surface.

[0078] In specific implementation, first, in the initial state, the oil pressures at the first oil inlet 21 and the second oil inlet 31 are made the same. Then, under the combined action of the oil pressures on both sides, the multi-stage buffer mechanism 44 is compressed respectively through the first piston surface 42 and the second piston surface 43, and the acting force of the oil pressure is gradually dispersed on the piston surfaces, so that the thrust of the oil pressure on the piston surfaces is more evenly distributed on the piston surfaces, effectively improving the stability of the piston adjusting device 4 and maintaining the central connecting member 41 stationary in the cylinder block 1. Next, when the connecting rod 5 is pushed out, the oil pressure at the first oil inlet 21 is increased, and the oil pressure at the second oil inlet 31 is decreased. Then, under the interaction of the oil pressures, the pressure on the second piston surface 43 is reduced, while the pressure on the first piston surface 42 is increased. The multi-stage buffer mechanisms 44 on both sides are gradually compressed with the second piston surface 43 as the fixed surface, and at the same time, the central connecting member 41 is driven to move towards the second piston surface 43, thereby driving the entire piston adjusting device 4 to move towards the position of the right end cover 3 in the cylinder block 1. Then, under the buffering action of the buffer spring 63, the piston adjusting device 4 drives the connecting rod 5 to move smoothly on the limiting rod 61 to push out the connecting rod 5; when the connecting rod 5 is retracted, the oil pressure at the first oil inlet 21 is decreased, and the oil pressure at the second oil inlet 31 is increased. Then, under the interaction of the oil pressures, the pressure on the second piston surface 43 is increased, while the pressure on the first piston surface 42 is reduced. The multi-stage buffer mechanisms 44 on both sides are gradually compressed with the first piston surface 42 as the fixed surface, and at the same time, the central connecting member 41 is driven to move towards the first piston surface 42, thereby driving the entire piston adjusting device 4 to move towards the position of the left end cover 2 in the cylinder block 1. Then, under the buffering action of the buffer spring 63, the piston adjusting device 4 drives the connecting rod 5 to move smoothly on the limiting rod 61 to retract the connecting rod 5.

[0079] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A hydraulic system fluid pressure actuator, characterized in that: Comprising: Cylinder block (1); Left end cover (2), fixed to the left end of the cylinder block (1); Right end cover (3), fixed to the right end of the cylinder block (1), corresponding to the left end cover (2); Piston adjusting device (4), slidably arranged in the cylinder block (1); Connecting rod (5), arranged on the central axis of the cylinder block (1), fixedly connected to the piston adjusting device (4), and slidably connected to the center of the right end cover (3); Buffer assembly (6), one end fixedly connected to the left end cover (2), and the other end slidably arranged inside the connecting rod (5); The piston adjusting device (4) includes: Central connecting piece (41), slidably arranged in the cylinder block (1), and the side of the central connecting piece (41) close to the right end cover (3) is fixedly connected to the connecting rod (5); First piston surface (42), slidably arranged in the cylinder block (1), located on the left side of the central connecting piece (41), and the center of the first piston surface (42) is slidably connected to the buffer assembly (6); Second piston surface (43), slidably arranged in the cylinder block (1), corresponding to the first piston surface (42), located on the right side of the central connecting piece (41), and the center of the second piston surface (43) is slidably connected to the connecting rod (5); Multi-stage buffer mechanism (44), symmetrically distributed in two groups with respect to the central connecting piece (41), respectively fixed on both sides of the central connecting piece (41), and the multi-stage buffer mechanisms (44) are respectively in contact with the corresponding first piston surface (42) and second piston surface (43).

2. A fluid pressure actuator of a hydraulic system according to claim 1, characterized in that: A first oil port (21) is provided on the side of the left end cover (2), a second oil port (31) is provided on the side of the right end cover (3), and the first oil port (21) and the second oil port (31) are respectively communicated with both ends of the cylinder block (1) and an external oil tank.

3. A hydraulic system fluid pressure actuator according to claim 1, characterized in that: The central connecting piece (41) includes: Connecting circular surface (411), arranged in the cylinder block (1), the center of the side close to the right end cover (3) is fixedly connected to the connecting rod (5), and both sides of the connecting circular surface (411) are respectively fixedly connected to the corresponding multi-stage buffer mechanisms (44); Sealing ring (412), fixed on the outer ring of the connecting circular surface (411), and the sealing ring (412) is slidably connected to the inner wall of the cylinder block (1).

4. A hydraulic system fluid pressure actuator according to claim 3, characterized in that: The multi-stage buffer mechanism (44) includes: Outer compression assembly (441), one end fixedly connected to the side surface of the connecting circular surface (411), and the other end in contact with the piston surface; Inner compression assemblies (442), a plurality of which are arranged in sequence from the outside to the center of the connecting circular surface (411), and the inner compression assemblies (442) are arranged inside the outer compression assembly (441), one end of the inner compression assemblies (442) is fixedly connected to the side surface of the connecting circular surface (411), and the other end corresponds to the piston surface, and the inner compression assemblies (442) and the outer compression assembly (441) have the same structure.

5. A hydraulic system fluid pressure actuator according to claim 4, characterized in that: The outer compression assembly (441) includes: Fixed ring surface (4411), fixed to the side of the connecting circular surface (411); Compression spring (4412), fixed to the side of the fixed ring surface (4411) away from the connecting circular surface (411); The connecting toroidal surface (4413) is fixed to the end of the compression spring (4412) away from the fixed toroidal surface (4411), and the connecting toroidal surface (4413) corresponds to the side of the piston surface; The spacer toroidal surface (4414) is fixed to the inner ring of the connecting toroidal surface (4413), and the spacer toroidal surface (4414) is in contact with the adjacent compression assembly; The pushing toroidal surface (4415) is fixed to the middle of the inner side of the spacer toroidal surface (4414) and is parallel to the connecting toroidal surface (4413) in the adjacent compression assembly.

6. A hydraulic system fluid pressure actuator according to claim 5, characterized in that: The compression degrees of the plurality of compression springs (4412) decrease sequentially from the outside to the center of the connecting circular surface (411), and during the compression of the compression springs (4412), each pushing toroidal surface (4415) must be in contact with the corresponding connecting toroidal surface (4413).

7. A fluid pressure actuator of a hydraulic system according to claim 1, wherein: The buffer assembly (6) includes: A limiting rod (61) with one end fixedly connected to the left end cover (2) and the other end passing through the first piston surface (42) and the central connecting member (41) and being arranged in the connecting rod (5); A positioning slider (62) fixed to the end of the limiting rod (61) located in the connecting rod (5), and the positioning slider (62) is slidably arranged inside the connecting rod (5); A buffer spring (63) sleeved on the limiting rod (61) and located inside the connecting rod (5), and fixedly connected to the side of the positioning slider (62).

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