Automobile piston rod oil seal assembling mechanism and method

Abstract

The invention relates to the technical field of automobile manufacturing equipment, and discloses an automobile piston rod oil seal assembling mechanism and method.The automobile piston rod oil seal assembling mechanism comprises a bottom plate, a sleeve is fixedly connected to the surface of the bottom plate, a cavity is formed in the bottom plate, and a movable assembly is arranged on the inner side wall of the cavity. According to the automobile piston rod oil seal assembling mechanism, through arrangement of a first motor, a first bevel gear, a second bevel gear, a first threaded rod and a telescopic rod, during accurate alignment, the first motor is started firstly to drive the first bevel gear to rotate, and meanwhile, the second bevel gear meshed with the surface of the first bevel gear is driven to rotate; under the combined action of the second bevel gear and the first threaded rod, the telescopic rod moves until the telescopic rod moves to a proper position, it can be guaranteed that the oil seal is installed at the designated position of the piston rod, and therefore the sealing performance of the oil seal is guaranteed, the problems of leakage and the like caused by insufficient installation precision are solved, and the product quality and reliability are improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing equipment, and in particular to an automobile piston rod oil seal assembly mechanism and method. Background Art

[0002] In automobile manufacturing, the sealing performance of the piston rod is extremely critical, and the oil seal is the core component to ensure its sealing, which plays a decisive role in ensuring the stable operation of the automobile system; traditional oil seal assembly mainly relies on manual labor, which is inefficient and difficult to ensure the consistency and accuracy of installation due to operational differences, often leading to problems such as poor sealing and oil leakage, which not only affects the performance and safety of the vehicle, but also increases the intensity of manual labor and is prone to mistakes due to fatigue; the automobile industry is developing rapidly, and the requirements for output and quality are constantly increasing. Traditional assembly methods cannot meet the needs of large-scale, high-quality production; the oil seal processing process is complicated, involving feeding, pressing, hot pressing, etc. In the past, the assembly mechanism could not achieve intelligent control, and the various links were disconnected, and an efficient automated production line could not be formed, resulting in a long production cycle and high cost, which restricted the development of the enterprise.

[0003] However, the existing automobile piston rod oil seal assembly mechanism has the following disadvantages: The installation of piston rod oil seal requires precise alignment. The commonly used devices are difficult to make the oil seal fit more closely and accurately with the piston rod during installation. The installation of the piston rod oil seal usually requires manual installation, and it is difficult to accurately push the piston ring into the groove in a short time, resulting in low production efficiency. Therefore, the present invention provides an automobile piston rod oil seal assembly mechanism. Summary of the invention

[0004] (I) Technical problems to be solved: The present invention aims to provide an automobile piston rod oil seal assembly mechanism which is highly practical, can be easily operated and has a relatively simple structure, thereby solving the problems raised in the above-mentioned background technology that it is difficult to make the oil seal fit more closely and accurately with the piston rod during installation and that it is difficult to accurately push the piston ring into the groove in a short time.

[0005] (II) Technical solution: To achieve the above purpose, the present invention is implemented by the following technical solution: an automobile piston rod oil seal assembly mechanism, comprising a bottom plate, a sleeve is fixedly connected to the surface of the bottom plate, a cavity is provided inside the bottom plate, a movable component is provided on the inner side wall of the cavity, one end of the movable component is fixedly connected to a cross bar, a round tube is fixedly connected to the lower surface of the cross bar, a sliding groove is provided on the surface of the round tube, a fixed block is fixedly connected to one end of the round tube, and a mounting component is provided on the inner side wall of the round tube; The movable assembly includes a first motor fixed to the inner wall of the cavity, the output end of the first motor is spline-connected with a first transmission rod, one end of the first transmission rod is fixedly connected with a first bevel gear, the surface of the first bevel gear is meshed with a second bevel gear, a first threaded rod is fixedly passed through the center of the second bevel gear, the surface of the first threaded rod is threadedly sleeved with a telescopic rod, and the surface of the telescopic rod is slidably connected to the inside of the sleeve; The mounting assembly includes a second motor fixed to the inner wall of the round tube, the output end of the second motor is splinedly connected to the second transmission rod, one end of the second transmission rod is fixedly connected to the second threaded rod, the thread of the second threaded rod passes through a connecting block, the connecting block is slidably connected to the inner wall of the slide groove, one side of the connecting block is fixedly connected to a connecting pipe, the lower surface of the connecting pipe is installed with a mounting paddle, the surface of the bottom plate is installed with a round rod, the surface of the round rod is provided with an annular groove, and the inner side wall of the annular groove is rotatably connected with a blocking block.

[0006] Optionally, the lower surface of the base plate is fixedly connected with supporting legs, and the supporting legs are arranged in a rectangular shape. The arrangement of the supporting legs can avoid tilting or shaking due to uneven force during operation.

[0007] Optionally, a pad is installed at one end of the leg, and the number of the pads is four. The setting of the pad plays a buffering role and absorbs vibrations during work.

[0008] Optionally, a tool box is installed on the surface of the base plate, and the tool box is symmetrically arranged. The arrangement of the tool box facilitates operators to access tools at different positions.

[0009] Optionally, a mounting seat is fixedly connected to the surface of the base plate, and the mounting seat is arranged in a circular shape. The piston can be better fixed by the arrangement of the mounting seat.

[0010] Optionally, a rotation groove is provided on the inner bottom wall of the cavity, and the first threaded rod rotates inside the rotation groove. The stability of the movable component is improved by setting the rotation groove.

[0011] Optionally, a method for assembling the automotive piston rod oil seal assembly mechanism comprises the following steps: Equipment debugging: Check whether the connections of the components of the assembly mechanism are firm and whether the electrical connections are normal. Start the first motor and the second motor to test whether they operate normally. Observe whether the telescopic rod slides smoothly in the sleeve and whether the movement trajectory of the installation paddle meets the requirements. Height adjustment: Place the piston rod on the mounting seat, start the first motor according to the height of the piston rod, and the output end of the first motor drives the first transmission rod to rotate, thereby driving the first bevel gear to rotate, and the second bevel gear meshing with the first bevel gear rotates accordingly, and the second bevel gear drives the first threaded rod to rotate, so that the telescopic rod moves up and down along the thread direction of the first threaded rod, driving the crossbar and the round tube components to rise or fall as a whole, until the position of the round tube matches the installation position of the oil seal on the piston rod; Oil seal installation: Place the oil seal on the installation paddle, start the second motor, the output end of the second motor drives the second transmission rod to rotate, drives the second threaded rod to rotate, and the connecting block threadedly connected to the second threaded rod makes a linear motion under the restriction of the slide slot, drives the connecting pipe and the installation paddle to move downward, when the installation paddle drives the blocking block to contact the upper surface of the oil seal, reverse the second motor, drive the installation paddle to move upward, and install the oil seal to the specified position of the piston rod; Quality inspection: After installation, inspect the installation quality of the oil seal to see if the oil seal fits tightly with the piston rod and if there is any offset. If any problems are found, adjust or reinstall them in time.

[0012] Optionally, the equipment debugging step also includes an operation of calibrating the rotational speeds of the first motor and the second motor, specifically: using a speed meter to respectively measure the actual rotational speeds of the first motor and the second motor, and comparing them with the preset rotational speeds; if the deviation between the actual rotational speed and the preset rotational speed exceeds an allowable range, the input voltage or frequency of the motor is adjusted through the motor controller until the actual rotational speed meets the preset requirements.

[0013] Optionally, in the height adjustment step, the moving distance of the telescopic rod is monitored in real time by a sensor, specifically: a displacement sensor is installed on the telescopic rod or the sleeve, the displacement sensor is electrically connected to the controller, and when the first motor is started, the displacement sensor collects the displacement data of the telescopic rod in real time and transmits it to the controller, and the controller controls the first motor to stop rotating when the telescopic rod moves to an appropriate position according to a preset height value.

[0014] Optionally, in the quality inspection step, a pressure detection method is used to detect the oil seal installation quality, specifically: gas or liquid with a certain pressure is passed into the piston rod, and the detection liquid is applied around the oil seal installation position to observe whether bubbles are generated. If bubbles are generated, it indicates that there is a leakage problem in the oil seal installation and it needs to be reinstalled; if no bubbles are generated, the oil seal installation quality is judged to be qualified.

[0015] (III) Beneficial effects: The present invention provides an automobile piston rod oil seal assembly mechanism, which has the following beneficial effects: 1. The automobile piston rod oil seal assembly mechanism, through the arrangement of the first motor, the first bevel gear, the second bevel gear, the first threaded rod and the telescopic rod, when accurately aligned, first starts the first motor to drive the first bevel gear to rotate, and at the same time drives the second bevel gear meshing with the surface to rotate, under the joint action of the second bevel gear and the first threaded rod, the telescopic rod moves until it moves to a suitable position, which can ensure that the oil seal is installed at the specified position of the piston rod, thereby ensuring the sealing performance of the oil seal, reducing leakage and other problems caused by insufficient installation accuracy, and improving the quality and reliability of the product; 2. The automobile piston rod oil seal assembly mechanism is provided with a second motor, a second threaded rod, a connecting block, a connecting pipe, an installation paddle and a blocking block. When installing the oil seal, first start the second motor to drive the second threaded rod to rotate, and at the same time drive the connecting block threadedly connected thereto to move. Under the joint action of the connecting block and the connecting pipe, the installation paddle moves downward, and then the blocking block is driven to contact the upper surface of the oil seal. At the same time, the installation paddle is driven upward by the reverse rotation of the second motor to complete the installation of the oil seal. The device can realize fast and accurate installation of the piston ring. Compared with manual installation, it greatly shortens the installation time and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the toolbox structure of the present invention; Figure 3 It is a schematic diagram of the telescopic rod structure of the present invention; Figure 4 This is a schematic diagram of the paddle installation structure of the present invention.

[0017] In the figure: 1, base plate; 2, sleeve; 3, movable component; 301, first motor; 302, first bevel gear; 303, second bevel gear; 304, first threaded rod; 305, telescopic rod; 4, cross bar; 5, round tube; 6, fixing block; 7, mounting component; 701, second motor; 702, second threaded rod; 703, connecting block; 704, connecting tube; 705, mounting paddle; 706, blocking block; 8, supporting leg; 9, pad; 10, tool box; 11, mounting base. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 4The present invention provides a technical solution: an automobile piston rod oil seal assembly mechanism, comprising a bottom plate 1, a sleeve 2 is fixedly connected to the surface of the bottom plate 1, a cavity is provided inside the bottom plate 1, a movable component 3 is provided on the inner side wall of the cavity, one end of the movable component 3 is fixedly connected to a cross bar 4, a round tube 5 is fixedly connected to the lower surface of the cross bar 4, a sliding groove is provided on the surface of the round tube 5, a fixed block 6 is fixedly connected to one end of the round tube 5, and a mounting component 7 is provided on the inner side wall of the round tube 5; The movable component 3 includes a first motor 301 fixed to the inner wall of the cavity, the output end of the first motor 301 is splined with the first transmission rod, one end of the first transmission rod is fixedly connected to the first bevel gear 302, the surface of the first bevel gear 302 is meshed with the second bevel gear 303, the center of the second bevel gear 303 is fixedly penetrated by a first threaded rod 304, the surface of the first threaded rod 304 is threadedly sleeved with a telescopic rod 305, the surface of the telescopic rod 305 is slidably connected to the inside of the sleeve 2, and through the arrangement of the first motor 301, the first bevel gear 302, the second bevel gear 303, the first threaded rod 304 and the telescopic rod 305, when accurately aligned, the first motor 301 is first started to drive the first bevel gear 302 to rotate. The gear 302 rotates, and at the same time drives the second bevel gear 303 meshing with the surface to rotate. Under the joint action of the second bevel gear 303 and the first threaded rod 304, the telescopic rod 305 moves until it moves to a suitable position, which can ensure that the oil seal is installed at the specified position of the piston rod, thereby ensuring the sealing performance of the oil seal, reducing leakage and other problems caused by insufficient installation accuracy, and improving the quality and reliability of the product. In the height adjustment part, the relationship between the pitch of the threaded rod, the motor speed and the moving speed can be added. For example, the pitch P=5mm, the motor speed n=100rpm, then the moving speed of the telescopic rod v=Pn=5mm100=500mm / min. In this way, the adjustment process can be quantified; The mounting assembly 7 comprises a second motor 701 fixed to the inner wall of the round tube 5, the output end of the second motor 701 is splinedly connected to the second transmission rod, one end of the second transmission rod is fixedly connected to the second threaded rod 702, the thread of the second threaded rod 702 passes through a connecting block 703, the connecting block 703 is slidably connected to the inner wall of the slide groove, one side of the connecting block 703 is fixedly connected to a connecting pipe 704, the lower surface of the connecting pipe 704 is installed with a mounting paddle 705, a round rod is installed on the surface of the bottom plate 1, an annular groove is opened on the surface of the round rod, and a blocking block 706 is rotatably connected to the inner wall of the annular groove. 03. The setting of the connecting tube 704, the installation paddle 705 and the blocking block 706. When installing the oil seal, first start the second motor 701 to drive the second threaded rod 702 to rotate, and at the same time drive the connecting block 703 threadedly connected thereto to move. Under the joint action of the connecting block 703 and the connecting tube 704, the installation paddle 705 moves downward, and then the blocking block 706 is moved to contact the upper surface of the oil seal. At the same time, the installation paddle 705 is driven to move upward by the reverse rotation of the second motor 701, and the installation of the oil seal can be completed. The device can realize the rapid and accurate installation of the piston ring. Compared with manual installation, it greatly shortens the installation time and improves the production efficiency. The lower surface of the bottom plate 1 is fixedly connected with a support leg 8, and the support leg 8 is arranged to avoid tilting or shaking due to uneven force during operation, and the support legs 8 are arranged in a rectangular shape; A cushion block 9 is installed at one end of the leg 8. The cushion block 9 plays a buffering role and absorbs vibration during work. There are four cushion blocks 9. A tool box 10 is installed on the surface of the bottom plate 1. The tool box 10 is arranged to facilitate operators to take tools at different positions. The tool box 10 is arranged symmetrically. The surface of the bottom plate 1 is fixedly connected with a mounting seat 11. The piston can be better fixed by setting the mounting seat 11. The mounting seat 11 is set in a circular shape. The inner bottom wall of the cavity is provided with a rotation groove, and the stability of the movable assembly is improved by the provision of the rotation groove, and the first threaded rod 304 rotates inside the rotation groove.

[0020] In the present invention, the method for assembling an automobile piston rod oil seal assembly mechanism comprises the following steps: Equipment debugging: Check whether the connection of each component of the assembly mechanism is firm and whether the electrical connection is normal, start the first motor 301 and the second motor 701, test whether they operate normally, observe whether the telescopic rod 305 slides smoothly in the sleeve 2, and whether the movement trajectory of the installation paddle 705 meets the requirements; Height adjustment: Place the piston rod on the mounting seat 11, and start the first motor 301 according to the height of the piston rod. The output end of the first motor 301 drives the first transmission rod to rotate, and then drives the first bevel gear 302 to rotate, and the second bevel gear 303 meshing with the first bevel gear 302 rotates accordingly. The second bevel gear 303 drives the first threaded rod 304 to rotate, so that the telescopic rod 305 moves up and down along the thread direction of the first threaded rod 304, driving the cross bar 4, the round tube 5 and other components to rise or fall as a whole until the position of the round tube 5 matches the installation position of the oil seal on the piston rod; Installation of oil seal: Place the oil seal on the installation paddle 705, start the second motor 701, the output end of the second motor 701 drives the second transmission rod to rotate, drives the second threaded rod 702 to rotate, and the connecting block 703 threadedly connected to the second threaded rod 702 makes a linear motion under the restriction of the slide groove, drives the connecting pipe 704 and the installation paddle 705 to move downward, when the installation paddle 705 drives the blocking block 706 to contact the upper surface of the oil seal, reverse the second motor 701, drive the installation paddle 705 to move upward, and install the oil seal to the specified position of the piston rod; Quality inspection: After installation, inspect the installation quality of the oil seal to see if the oil seal fits tightly with the piston rod and if there is any offset. If any problems are found, adjust or reinstall them in time.

[0021] In the present invention, the equipment debugging step also includes the operation of calibrating the rotational speeds of the first motor 301 and the second motor 701, specifically: using a rotation speed measuring instrument to measure the actual rotational speeds of the first motor 301 and the second motor 701 respectively, and comparing them with the preset rotational speeds. If the deviation between the actual rotational speed and the preset rotational speed exceeds the allowable range, the input voltage or frequency of the motor is adjusted through the motor controller until the actual rotational speed meets the preset requirements.

[0022] In the present invention, in the height adjustment step, the moving distance of the telescopic rod 305 is monitored in real time by a sensor, specifically: a displacement sensor is installed on the telescopic rod 305 or the sleeve 2, and the displacement sensor is electrically connected to the controller. When the first motor 301 is started, the displacement sensor collects the displacement data of the telescopic rod 305 in real time and transmits it to the controller. The controller controls the first motor 301 to stop rotating when the telescopic rod 305 moves to an appropriate position according to a preset height value.

[0023] In the present invention, in the quality inspection step, a pressure detection method is used to detect the installation quality of the oil seal, specifically: a gas or liquid with a certain pressure is passed into the piston rod, and a detection liquid is applied around the oil seal installation position to observe whether bubbles are generated. If bubbles are generated, it indicates that there is a leakage problem in the installation of the oil seal and it needs to be reinstalled; if no bubbles are generated, the oil seal installation quality is judged to be qualified.

[0024] It should be noted that the device structure and the drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above invention, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field; The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile piston rod oil seal assembly mechanism, comprising a base plate (1), characterized in that: A sleeve (2) is fixedly connected to the surface of the bottom plate (1), a cavity is provided inside the bottom plate (1), a movable component (3) is provided on the inner side wall of the cavity, one end of the movable component (3) is fixedly connected to a cross bar (4), a round tube (5) is fixedly connected to the lower surface of the cross bar (4), a sliding groove is provided on the surface of the round tube (5), one end of the round tube (5) is fixedly connected to a fixing block (6), and a mounting component (7) is provided on the inner side wall of the round tube (5); The movable component (3) comprises a first motor (301) fixed to the inner wall of the cavity, the output end of the first motor (301) is spline-connected to a first transmission rod, one end of the first transmission rod is fixedly connected to a first bevel gear (302), the surface of the first bevel gear (302) is meshed with a second bevel gear (303), a first threaded rod (304) is fixedly passed through the center of the second bevel gear (303), a telescopic rod (305) is threadedly sleeved on the surface of the first threaded rod (304), and the surface of the telescopic rod (305) is slidably connected to the inside of the sleeve (2); The mounting assembly (7) comprises a second motor (701) fixed to the inner wall of the round tube (5); the output end of the second motor (701) is spline-connected to a second transmission rod; one end of the second transmission rod is fixedly connected to a second threaded rod (702); the thread of the second threaded rod (702) penetrates a connecting block (703); the connecting block (703) is slidably connected to the inner wall of the slide groove; one side of the connecting block (703) is fixedly connected to a connecting tube (704); a mounting paddle (705) is mounted on the lower surface of the connecting tube (704); a round rod is mounted on the surface of the bottom plate (1); an annular groove is formed on the surface of the round rod; a blocking block (706) is rotatably connected to the inner wall of the slide groove.

2. The automobile piston rod oil seal assembly mechanism according to claim 1, characterized in that: The lower surface of the bottom plate (1) is fixedly connected with supporting legs (8), and the supporting legs (8) are arranged in a rectangular shape.

3. The automobile piston rod oil seal assembly mechanism according to claim 2, characterized in that: A cushion block (9) is mounted on one end of the supporting leg (8), and the cushion blocks (9) are four in number.

4. The automobile piston rod oil seal assembly mechanism according to claim 1, characterized in that: A tool box (10) is mounted on the surface of the bottom plate (1), and the tool box (10) is symmetrically arranged.

5. The automobile piston rod oil seal assembly mechanism according to claim 1, characterized in that: A mounting seat (11) is fixedly connected to the surface of the bottom plate (1), and the mounting seat (11) is arranged in a circular shape.

6. The automobile piston rod oil seal assembly mechanism according to claim 1, characterized in that: The inner bottom wall of the cavity is provided with a rotation groove, and the first threaded rod (304) rotates inside the rotation groove.

7. A method for assembling an automobile piston rod oil seal assembly mechanism according to any one of claims 1 to 6, characterized in that: The following steps are involved: Equipment debugging: Check whether the connections of the components of the assembly mechanism are firm and whether the electrical connections are normal, start the first motor (301) and the second motor (701) to test whether they operate normally, observe whether the telescopic rod (305) slides smoothly in the sleeve (2), and whether the movement trajectory of the installation paddle (705) meets the requirements; Height adjustment: the piston rod is placed on the mounting seat (11), and the first motor (301) is started according to the height of the piston rod. The output end of the first motor (301) drives the first transmission rod to rotate, thereby driving the first bevel gear (302) to rotate, and the second bevel gear (303) meshing with the first bevel gear (302) rotates accordingly. The second bevel gear (303) drives the first threaded rod (304) to rotate, so that the telescopic rod (305) moves up and down along the thread direction of the first threaded rod (304), driving the cross rod (4), the round tube (5) and other components to rise or fall as a whole until the position of the round tube (5) matches the installation position of the oil seal on the piston rod; Installation of the oil seal: the oil seal is placed on the installation paddle (705), and the second motor (701) is started. The output end of the second motor (701) drives the second transmission rod to rotate, which drives the second threaded rod (702) to rotate. The connecting block (703) threadedly connected to the second threaded rod (702) moves linearly under the restriction of the slide groove, which drives the connecting pipe (704) and the installation paddle (705) to move downward. When the installation paddle (705) drives the blocking block (706) to contact the upper surface of the oil seal, the second motor (701) is reversed to drive the installation paddle (705) to move upward, and the oil seal is installed at the specified position of the piston rod. Quality inspection: After installation, inspect the installation quality of the oil seal to see if the oil seal fits tightly with the piston rod and if there is any offset. If any problems are found, adjust or reinstall them in time.

8. The method for assembling an automobile piston rod oil seal according to claim 7, characterized in that: The equipment debugging step also includes an operation of calibrating the rotation speeds of the first motor (301) and the second motor (701), specifically: using a rotation speed measuring instrument to measure the actual rotation speeds of the first motor (301) and the second motor (701), respectively, and comparing them with the preset rotation speeds; if the deviation between the actual rotation speed and the preset rotation speed exceeds an allowable range, adjusting the input voltage or frequency of the motor through a motor controller until the actual rotation speed meets the preset requirements.

9. The method for assembling an automobile piston rod oil seal according to claim 7, characterized in that: In the height adjustment step, the moving distance of the telescopic rod (305) is monitored in real time by means of a sensor, specifically: a displacement sensor is installed on the telescopic rod (305) or the sleeve (2), the displacement sensor is electrically connected to a controller, and when the first motor (301) is started, the displacement sensor collects displacement data of the telescopic rod (305) in real time and transmits it to the controller, and the controller controls the first motor (301) to stop rotating when the telescopic rod (305) moves to a suitable position according to a preset height value.

10. The method for assembling an automobile piston rod oil seal according to claim 7, characterized in that: In the quality inspection step, a pressure detection method is used to detect the installation quality of the oil seal, specifically: a gas or liquid with a certain pressure is passed into the piston rod, and a detection liquid is applied around the oil seal installation position to observe whether bubbles are generated. If bubbles are generated, it indicates that there is a leakage problem in the installation of the oil seal and it needs to be reinstalled; if no bubbles are generated, the installation quality of the oil seal is judged to be qualified.

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