Exhaust device for an oil damper and exhaust method thereof

Abstract

The application discloses an oil pressure damper exhaust device and an exhaust method thereof, which comprises a moving trolley, positioning tools, oil storage cylinder assemblies, a manual driving mechanism and an electric driving mechanism. A plurality of groups of rotatable positioning tools are arranged on the moving trolley. A plurality of oil storage cylinder assemblies are positioned and placed on the positioning tools. The positioning tools are driven to swing by the manual driving mechanism or the electric driving mechanism. The manual driving mechanism and the electric driving mechanism are installed on the moving trolley. Through the above mode, the application has the advantages of simple structure, added oil pressure damper exhaust process, and the oil storage cylinder assemblies are positively inclined and statically placed after oil injection. After a set time, the oil storage cylinder assemblies are reversely inclined, air bubbles in the cavities are effectively discharged, and the damping performance of the damper is improved.

Description

Technical Field

[0001] This invention relates to the field of hydraulic vibration dampers for high-speed trains, and in particular to an exhaust device and exhaust method for a hydraulic vibration damper. Background Technology

[0002] In the manufacturing process of hydraulic shock absorbers, after the bottom valve and working cylinder are press-fitted, they are placed into the oil reservoir assembly, and then the oil injection process is performed. At the same time, an air bladder is placed in the oil reservoir. At this time, due to the compression deformation of the air bladder and the porous irregular structure of the bottom valve, free air bubbles will be trapped in the oil cavity. When the shock absorber is working, the air bubbles in the working cavity will cause discontinuous damping force, that is, defects such as abrupt changes in the indicator diagram will occur. In the existing technology, no air venting is performed after oil injection, which leads to defects in the indicator diagram and unqualified damping performance during performance testing. Disassembly and rework are required, resulting in low production efficiency.

[0003] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design an exhaust device and exhaust method for a hydraulic shock absorber. Summary of the Invention

[0004] The main technical problem solved by this invention is to provide an exhaust device and exhaust method for a hydraulic shock absorber, which solves the problem that the existing hydraulic shock absorbers have defects in the indicator diagram and unqualified damping performance during the performance test due to air bubbles in the oil cavity during the production process.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by the present invention is to provide an exhaust device for a hydraulic shock absorber. The exhaust device for the hydraulic shock absorber includes a mobile trolley, a positioning fixture, an oil reservoir assembly, a manual drive mechanism, and an electric drive mechanism. The mobile trolley is equipped with several sets of rotatable positioning fixtures. Several oil reservoir assemblies are positioned on the positioning fixtures. The positioning fixtures are driven to swing by the manual drive mechanism or the electric drive mechanism. The manual drive mechanism and the electric drive mechanism are mounted on the mobile trolley.

[0006] Preferably, the mobile trolley includes a frame and wheels. The overall frame of the trolley is welded from square tubing. Wheels are installed at the bottom of the frame. The wheels adopt a bottom plate type double brake structure. The wheels are made of polyurethane with an iron core. Two sets of parallel upper Y-direction crossbeams and lower Y-direction crossbeams are installed on the frame. Two opposing support blocks are welded between the upper Y-direction crossbeams and the lower Y-direction crossbeams. The support blocks are provided with mounting holes that cooperate with bearings to support the weight of the positioning fixture and the oil reservoir assembly. The top of the frame is provided with a support beam that is parallel and offset from the positioning fixture.

[0007] Preferably, the positioning fixture includes a base, a PVC pipe, an upper plate, side plates, a bottom plate, and a rotating shaft. The bottom plate, upper plate, and side plates are sheet metal parts, welded together to support and encapsulate the base and the PVC pipe. The base has several circular grooves that fit with the outer diameter of the PVC pipe. The PVC pipe is used to house the oil reservoir assembly. The bottom of each circular groove has a groove end face that fits with the lower end face of the PVC pipe. The bottom of each circular groove has a through groove. The upper plate has multiple upper plate circular holes. The PVC pipe fits with the upper plate circular holes. After assembly, the lower end face of the PVC pipe contacts the groove end face, and the PVC pipe extends out of the upper plate end face. The extended part of the PVC pipe is easy to put on and take off. The two outer side plates are inserted into the support block through the rotating shaft. The base has through holes that match the pin shaft.

[0008] Preferably, the electric drive mechanism includes a support plate, a stepper motor, a coupling, a control cabinet, and an HMI controller. A support plate is added to the frame, and a stepper motor is mounted on the support plate. The stepper motor is connected to the rotating shaft through the coupling. The forward and reverse rotation of the stepper motor controls the forward and reverse rotation of the positioning fixture. A control cabinet is added to the frame, and the control cabinet contains electrical control components. An HMI controller is located above the control cabinet. The HMI controller controls the forward and reverse rotation of the stepper motor by outputting pulse signals. The HMI controller realizes timing, and the stepper motor is equipped with a braking device.

[0009] Preferably, the manual drive mechanism includes a crank, a handle, a pin, a limiting component, a nut, an angle plate, and a limiting block. A circular hole is provided in the middle of the crank, through which a rotating shaft on the other side of the positioning fixture passes. A handle is installed on the upper part of the crank, and a crank circular hole is provided at the bottom of the crank. The pin passes through the crank circular hole and is inserted into the through hole of the positioning fixture. A limiting component is installed inside the handle, comprising a slide rod, a positioning pin, and a spring. The slide rod slides axially within the handle, and a positioning pin passing through the crank is installed at the top of the slide rod. A ring of limiting holes is provided on the moving trolley. A sliding cavity for the slide rod to move is provided inside the handle. A spring is fitted on the slide rod, located within the sliding cavity, with its two ends abutting against the slide rod and the handle, respectively. A bearing is connected to the rotating shaft and the support block, allowing relative movement between the rotating shaft and the bearing. A nut is screwed onto the threaded portion of the rotating shaft, restricting the axial displacement of the crank. An angle plate is provided on the moving trolley, with four positive and negative limiting blocks welded onto it. The angle plate has multiple evenly distributed limiting holes.

[0010] A method for venting air from a hydraulic shock absorber, characterized in that the method includes the following steps:

[0011] S1. Oil reservoir assembly assembly: After pressing the bottom valve and working cylinder into the oil reservoir assembly, the oil injection process is performed, and an airbag is placed in the oil reservoir chamber at the same time.

[0012] S2. Oil reservoir assembly installation: After oil filling, the oil reservoir assembly is placed in the positioning fixture of the exhaust device. The oil reservoir assembly is placed inside the PVC pipe. The end face of the bottom lifting ring of the oil reservoir assembly matches the end face of the through groove on the base to restrict the product rotation. The oil reservoir assembly is equipped with a bottom valve, working cylinder and air bladder. The cavity is filled with oil, and the liquid level line is always horizontal.

[0013] S3. After the positioning fixture is loaded with the product, it is in a free vertical state under its own weight. The positioning fixture is driven by a human-powered or electric-powered mechanism to swing. After swinging to the set angle, it is left to stand still. Then it is swung in the opposite direction and left to stand still until there are no free air bubbles visible on the surface.

[0014] Preferably, in step S3, the angle is set to 6° and the plant is left to stand for 15 minutes.

[0015] Preferably, in step S3, when the oil reservoir assembly is being prototyped, the positioning fixture is driven by a manual drive mechanism. The handle drives the crank to rotate around the axis of the circular hole, and the pin drives the positioning fixture to swing. After swinging to the set angle, the slide rod is released, and the positioning pin is inserted into the limiting hole to restrict the swing of the positioning fixture. After the positioning fixture is loaded with the product, it is in a free vertical state A under its own weight. The positioning fixture swings around the axis of rotation. State B1 is a swing of 6°. After standing still for 15 minutes, it swings to state B2, which is a swing of -6°.

[0016] Preferably, in step S3, during mass production of the oil reservoir assembly, to reduce the workload of workers, the positioning fixture is driven by an electric drive mechanism. The forward and reverse rotation of the positioning fixture is controlled by a stepper motor. The forward and reverse rotation of the stepper motor is controlled by outputting pulse signals. The HMI controller realizes timing and alarm reminder functions after the process is completed. Sufficient torque is provided to ensure the swing function of the exhaust device. The swing speed is set to 1 revolution / minute, i.e., 6° / second. The HMI controller is set with a corresponding number of pulses, and the number of pulses N = (6° / 1.8°) × 2000 = 6666, to ensure slow swing and prevent oil from being impacted and splashed.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] After oil filling, an additional oscillation venting process is added to oscillate and settle the oil reservoir assembly, which helps to expel air bubbles and improve the damping performance of the shock absorber.

[0019] The exhaust system consists of a mobile trolley, positioning fixtures, and a drive unit. The drive unit is equipped with both manual and motor drive components to meet the needs of both prototype manufacturing and mass production stages.

[0020] The mobile trolley is equipped with wheels and a steel frame to meet the product's load-bearing and mobility requirements.

[0021] The positioning fixture ensures that the product does not shake or leak oil during stationary and moving processes;

[0022] The drive unit enables the product tilt angle setting, ensuring that air bubbles are effectively expelled. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the exhaust device of a hydraulic shock absorber.

[0024] Figure 2 This is a partial structural diagram of the exhaust device of a hydraulic shock absorber.

[0025] Figure 3 This is a schematic diagram of the unfolded structure of the positioning fixture for the exhaust device of a hydraulic shock absorber.

[0026] Figure 4 This is a cross-sectional view of a positioning fixture for the exhaust device of a hydraulic shock absorber.

[0027] Figure 5 Another perspective sectional view of the positioning fixture for the exhaust device of a hydraulic shock absorber.

[0028] Figure 6 This is a schematic diagram of the manually driven mechanism of the exhaust device of a hydraulic shock absorber.

[0029] Figure 7 This is a schematic diagram of the limiting component structure of the exhaust device of a hydraulic shock absorber.

[0030] Figure 8 This is a schematic diagram of the positioning fixture for the exhaust device of a hydraulic shock absorber in different states.

[0031] Among them, 1. mobile trolley, 11. truss, 12. wheels, 13. upper Y-direction crossbeam, 14. lower Y-direction crossbeam, 15. support block, 16. support beam;

[0032] 2. Positioning fixture, 20. Base, 21. PVC pipe, 22. Top plate, 23. Side plate, 24. Bottom plate, 25. Rotating shaft, 201. Circular groove, 202. Circular groove end face, 203. Through groove, 204. Circular hole in top plate, 205. Through hole;

[0033] 3. Oil reservoir assembly, 301. Lifting ring, 302. Oil, 303. Liquid level line;

[0034] 4. Manual drive mechanism, 41. Crank, 410. Round hole, 411. Crank round hole, 42. Handle, 420. Slide cavity, 43. Pin, 44. Limiting assembly, 441. Slide rod, 442. Positioning pin, 443. Spring, 44. 45. Nut, 46. Angle plate, 460. Limiting hole, 47. Limiting block;

[0035] 5. Electric drive mechanism; 51. Support plate; 52. Stepper motor; 53. Coupling; 54. Control cabinet; 55. HMI controller. Detailed Implementation

[0036] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0037] Please see Figures 1 to 8 The embodiments of the present invention include:

[0038] An exhaust device for a hydraulic vibration damper includes a mobile trolley 1, positioning fixtures 2, oil reservoir assemblies 3, a manual drive mechanism 4, and an electric drive mechanism 5. Two sets of rotatable positioning fixtures 2 are mounted on the mobile trolley 1. Five sets of oil reservoir assemblies 3 are positioned on the positioning fixtures 2. The positioning fixtures 2 are driven to swing by either the manual drive mechanism 4 or the electric drive mechanism 5. The manual drive mechanism 4 and the electric drive mechanism 5 are mounted on the mobile trolley 1. Figure 1 and Figure 2 As shown.

[0039] The mobile trolley 1 includes a frame 11 and wheels 12. The frame 11 is constructed from welded square tubing. Wheels 12 are mounted on the bottom of the frame 11 and feature a double-brake structure with a base plate. The wheels are made of polyurethane with an iron core. The mobile trolley 1 meets a 100kg load requirement. Two sets of parallel upper Y-axis beams 13 and lower Y-axis beams 14 are mounted on the frame 11. Two opposing support blocks 15 are welded between the upper Y-axis beams 13 and lower Y-axis beams 14. The support blocks 15 have mounting holes that mate with bearings to support the weight of the positioning fixture 2 and the oil cylinder assembly 3. A support beam 16 is provided on the top of the frame 11 and is parallel to and offset from the positioning fixture 2. After the oil cylinder assembly 3 is filled with oil, it can be vertically placed into the positioning fixture 2 for easy manual operation.

[0040] like Figure 3 and Figure 4As shown, the positioning fixture 2 includes a base 20, a PVC pipe 21, an upper plate 22, a side plate 23, a bottom plate 24, and a rotating shaft 25. The bottom plate 24, upper plate 22, and side plate 23 are sheet metal parts, welded together to support and encapsulate the base 20 and the PVC pipe 21. The base 20 has five sets of circular grooves 201 that fit with the outer diameter of the PVC pipe 21. The PVC pipe 21 is used to hold the oil reservoir assembly 3. The positioning fixture 2 can hold five products (oil reservoir assemblies 3 for filling). The bottom of the circular grooves 201 is provided with a groove that fits with the PVC pipe 21. The lower end face is fitted with a circular groove end face 202. Five sets of circular grooves 201 are provided with through grooves 203 at the bottom. The upper plate 22 is provided with multiple upper plate circular holes 204. The PVC pipe 21 is fitted with the upper plate circular holes 204. After assembly, the lower end face 21b of the PVC pipe 21 contacts the circular groove end face 202. The PVC pipe 21 extends out of the end face of the upper plate 22. The protruding part 21a of the PVC pipe 21 is easy to put in and take out. The damaged PVC pipe 21 can be replaced. The two outer side plates 23 are inserted into the support block 15 through the pivot 25. The base 20 is provided with through holes 205 that match the pin.

[0041] like Figure 5 As shown, the end face of the bottom lifting ring 301 of the oil reservoir assembly 3 mates with the end face of the through groove 203 on the base 24 to restrict the rotation of the product. The oil reservoir assembly 3 is equipped with a bottom valve, a working cylinder and an air bladder. The cavity is filled with oil 302 and the liquid level line 303 is always horizontal.

[0042] In mass production, to reduce the workload of workers, the positioning fixture 2 is driven by an electric drive mechanism 5, such as... Figure 2 As shown, the electric drive mechanism 5 includes a support plate 51, a stepper motor 52, a coupling 53, a control cabinet 54, and an HMI controller 55. A support plate 51 is added to the frame 11, and a stepper motor 52 is mounted on the support plate 51. The stepper motor 52 is connected to the rotating shaft 25 via the coupling 53. The forward and reverse rotation of the stepper motor 52 controls the forward and reverse rotation of the positioning fixture 2. A control cabinet 54 is added to the frame 11, and the control cabinet 54 houses electrical control components. An HMI controller 55 is located above the control cabinet 54. The pulse signal is output to control the forward and reverse rotation of the stepper motor 52. The HMI controller 55 can realize timing and alarm reminder functions after the process is completed. Sufficient torque is provided to ensure the swing function of the exhaust device. The swing speed is set to 1 revolution / minute, that is, 6° / second. The HMI controller 55 is set with a corresponding number of pulses, the number of pulses N=(6° / 1.8°)×2000=6666, to ensure slow swing to prevent oil from being impacted and splashed. The stepper motor 52 is equipped with a braking device to ensure rapid braking and improve the control accuracy of the rotation angle.

[0043] like Figure 6 , Figure 7 and Figure 8As shown, during the trial production of the three prototype oil reservoir assemblies, the positioning fixture 2 is driven by a manual drive mechanism 4. The manual drive mechanism 4 includes a crank 41, a handle 42, a pin 43, a limiting component 44, a nut 45, an angle plate 46, and a limiting block 47. The crank 41 has a circular hole 410 in the middle, and the rotating shaft 25 on the other side of the positioning fixture 2 passes through the circular hole 410. The handle 42 is installed on the upper part of the crank 41, and the bottom of the crank 41 has a crank circular hole 411. The pin 43 passes through the crank circular hole 411 and is inserted into the through hole 205 of the positioning fixture 2. The handle 42 contains a limiting component 44, which includes a slide rod 441, a positioning pin 442, and a spring 47. 43. The slide rod 441 is axially slidably placed inside the handle 42. A positioning pin 442 passing through the crank 41 is installed on the top of the slide rod 441. A limiting hole 460 is provided on the moving trolley 1 to cooperate with it. A sliding cavity 420 for the slide rod 441 to move is opened in the handle 42. A spring 443 is sleeved on the slide rod 441. The spring 443 is located in the sliding cavity 420 and its two ends abut against the slide rod 441 and the handle 42 respectively. The handle 42 drives the crank 41 to rotate around the axis of the circular hole 410. The pin 43 drives the positioning fixture 2 to swing. After swinging to a set angle, the slide rod 441 is released, and the positioning pin 442 is inserted into the limiting hole 460 to limit the swing of the positioning fixture 2. Figure 8 As shown, after the positioning fixture 2 is loaded with the product, it is in a free vertical state A under its own weight. The positioning fixture 2 swings around the rotating shaft 25. State B1 is a swing of 6°. After standing still for 15 minutes, it swings to state B2, which is a swing of -6°. The rotating shaft 25 and the support block 15 are connected by a bearing to reduce structural wear and reduce working noise. The rotating shaft 25 moves relative to the bearing. The threaded part of the outer end of the rotating shaft 25 is screwed with a nut 45. The nut 45 restricts the axial displacement of the crank 41. The moving trolley 1 is equipped with an angle plate 46. Four positive and negative limit blocks 47 are welded on the angle plate 46 to prevent the product from tipping over due to human error. The angle plate 46 is equipped with multiple evenly distributed limit holes 460 to meet the different angle control of the vibration damper of various specifications for exhaust.

[0044] A method for venting air from a hydraulic shock absorber, comprising the following steps:

[0045] S1. Assemble the oil reservoir assembly 3. After pressing the bottom valve and the working cylinder together, place them into the oil reservoir assembly and then perform the oil injection process. At the same time, place the airbag in the oil reservoir.

[0046] S2. After oil filling, the oil reservoir assembly 3 is placed in the positioning fixture 2 of the exhaust device. The oil reservoir assembly 3 is placed in the PVC pipe 21. The end face of the bottom lifting ring 301 of the oil reservoir assembly 3 matches the end face of the through groove 203 on the base 24 to restrict the product rotation. The oil reservoir assembly 3 is equipped with a bottom valve, working cylinder and air bag. The cavity is filled with oil 302. The liquid level line 303 is always horizontal.

[0047] S3. After the positioning fixture 2 is loaded with the product, it is in a free vertical state A under its own weight. The positioning fixture 2 is driven by the human-driven mechanism 4 or the electric-driven mechanism 5 to swing. After swinging to the set angle, it is left to stand still, then it is swung in the opposite direction and left to stand still until there are no free air bubbles on the surface.

[0048] Preferably, in step S3, the angle is set to 6° and the plant is left to stand for 15 minutes.

[0049] This invention discloses an exhaust device and method for a hydraulic shock absorber. By adding an exhaust process to the hydraulic shock absorber, the oil reservoir assembly is tilted forward and left to stand still after being filled with oil. After a set time, it is tilted in the reverse direction to effectively expel air bubbles from the cavity and improve the damping performance of the shock absorber. The exhaust device consists of a mobile trolley, a positioning fixture, and a drive unit. The tilt angle is adjustable, and the positioning fixture is replaceable to meet the application requirements of different product specifications. Automated control improves the accuracy of tilt angle control. During mass production, it reduces the need for manual tilting actions by employees, reduces labor intensity, and improves production efficiency.

[0050] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An exhaust device for a hydraulic shock absorber, characterized in that: The exhaust device of this type of hydraulic shock absorber includes a mobile trolley, a positioning fixture, an oil reservoir assembly, a manual drive mechanism, and an electric drive mechanism. The mobile trolley is equipped with several sets of rotatable positioning fixtures. Several oil reservoir assemblies are positioned on the positioning fixtures. The positioning fixtures are driven to swing by the manual drive mechanism or the electric drive mechanism. The manual drive mechanism and the electric drive mechanism are mounted on the mobile trolley. The mobile trolley includes a frame on which two sets of parallel upper Y-direction crossbeams and lower Y-direction crossbeams are mounted. Two opposing support blocks are welded between the upper Y-direction crossbeams and the lower Y-direction crossbeams. The support blocks are provided with mounting holes that mate with bearings to support the weight of the positioning fixture and the oil reservoir assembly. The positioning fixture includes a base, a PVC pipe, an upper plate, side plates, a bottom plate, and a rotating shaft. The bottom plate, upper plate, and side plates are sheet metal parts, which are welded together to support and encapsulate the base and the PVC pipe. The base has several circular grooves that fit with the outer diameter of the PVC pipe. The PVC pipe is used to hold the oil reservoir assembly. The bottom of the circular grooves has a circular groove end face that fits with the lower end face of the PVC pipe. The bottom of the circular grooves has through grooves. The upper plate has multiple upper plate circular holes. The PVC pipe fits with the circular holes of the upper plate. After assembly, the lower end face of the PVC pipe contacts the circular groove end face, and the PVC pipe extends out of the upper plate end face. The protruding part of the PVC pipe is easy to put on and take off. The two outer side plates are inserted into the support block through the rotating shaft. The base has through holes that match the pin shaft. The manually driven mechanism includes a crank, a handle, a pin, a limiting assembly, a nut, an angle plate, and a limiting block. A circular hole is provided in the middle of the crank, through which a rotating shaft on the other side of the positioning fixture passes. A handle is installed on the upper part of the crank, and a crank circular hole is provided at the bottom of the crank. The pin passes through the crank circular hole and is inserted into the through hole of the positioning fixture. A limiting assembly is installed inside the handle, comprising a slide rod, a positioning pin, and a spring. The slide rod slides axially within the handle, and a positioning pin passing through the crank is installed at the top of the slide rod. A ring of limiting holes is provided on the moving trolley. A sliding cavity for the slide rod to move is provided inside the handle. A spring is fitted on the slide rod, located within the sliding cavity, with its two ends abutting against the slide rod and the handle, respectively. A bearing is connected to the rotating shaft and the support block, allowing relative movement between the rotating shaft and the bearing. A nut is screwed onto the threaded portion of the rotating shaft, restricting the axial displacement of the crank. An angle plate is provided on the moving trolley, with four positive and negative limiting blocks welded onto it. The angle plate has multiple evenly distributed limiting holes.

2. The exhaust device for a hydraulic vibration damper according to claim 1, characterized in that: The mobile trolley also includes wheels. The overall frame of the trolley is made of welded square tubes. The wheels are installed at the bottom of the frame. The wheels adopt a bottom plate type double brake structure. The wheels are made of iron core polyurethane. The top of the trolley is provided with a support beam that is parallel and staggered to the positioning fixture.

3. The exhaust device for a hydraulic shock absorber according to claim 1, characterized in that: The electric drive mechanism includes a support plate, a stepper motor, a coupling, a control cabinet, and an HMI controller. A support plate is added to the frame, and a stepper motor is mounted on the support plate. The stepper motor is connected to the rotating shaft through the coupling. The forward and reverse rotation of the stepper motor controls the forward and reverse rotation of the positioning fixture. A control cabinet is added to the frame, and the control cabinet contains electrical control components. An HMI controller is located on top of the control cabinet. The HMI controller controls the forward and reverse rotation of the stepper motor by outputting pulse signals. The HMI controller realizes timing. The stepper motor is equipped with a braking device.

4. A method for venting a hydraulic shock absorber according to any one of claims 1-3, characterized in that: The exhaust method for this type of hydraulic shock absorber includes the following steps: S1. Oil reservoir assembly assembly: After pressing the bottom valve and working cylinder into the oil reservoir assembly, the oil injection process is performed, and an airbag is placed in the oil reservoir chamber at the same time. S2. Oil reservoir assembly installation: After oil filling, the oil reservoir assembly is placed in the positioning fixture of the exhaust device. The oil reservoir assembly is placed inside the PVC pipe. The end face of the bottom lifting ring of the oil reservoir assembly matches the end face of the through groove on the base to restrict the product rotation. The oil reservoir assembly is equipped with a bottom valve, working cylinder and air bladder. The cavity is filled with oil, and the liquid level line is always horizontal. S3. After the positioning fixture is loaded with the product, it is in a free vertical state under its own weight. The positioning fixture is driven by a human-powered or electric-powered mechanism to swing. After swinging to the set angle, it is left to stand still. Then it is swung in the opposite direction and left to stand still until there are no free air bubbles visible on the surface.

5. The exhaust method for a hydraulic shock absorber according to claim 4, characterized in that: In step S3, set the angle to 6° and let it stand for 15 minutes.

6. The exhaust method for a hydraulic vibration damper according to claim 4, characterized in that: In step S3, when the oil reservoir assembly is being prototyped, the positioning fixture is driven by a manual drive mechanism. The handle drives the crank to rotate around the axis of the circular hole, and the pin drives the positioning fixture to swing. After swinging to the set angle, the slide rod is released, and the positioning pin is inserted into the limiting hole to restrict the swing of the positioning fixture. After the positioning fixture is loaded with the product, it is in a free vertical state A under its own weight. The positioning fixture swings around the axis of rotation. State B1 is a swing of 6°. After standing still for 15 minutes, it swings to state B2, which is a swing of -6°.

7. The exhaust method for a hydraulic shock absorber according to claim 4, characterized in that: In step S3, during mass production of the oil reservoir assembly, to reduce the workload of workers, the positioning fixture is driven by an electric drive mechanism. The forward and reverse rotation of the positioning fixture is controlled by a stepper motor. The forward and reverse rotation of the stepper motor is controlled by outputting pulse signals. The HMI controller realizes timing and alarm reminder functions after the process is completed. Sufficient torque is provided to ensure the swing function of the exhaust device. The swing speed is set to 1 revolution / minute, i.e., 6° / second. The HMI controller is set with the corresponding number of pulses. The number of pulses N = (6° / 1.8°) × 2000 = 6666 to ensure slow swing and prevent oil from splashing due to impact.

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