Failure offset detection device and failure offset detection method for shock absorber oil seal

Abstract

The present invention relates to the technical field of oil seal detection, and provides a failure offset detection device and a failure offset detection method for a shock absorber oil seal. The failure offset detection device comprises: a connecting rod, which is used to pass through the center hole of the oil seal and seal against the sealing lip of the oil seal; a pushing device, which is connected to the connecting rod and can radially push the connecting rod; a displacement detection device, which is connected to the connecting rod or the pushing device; a sealing detection device, which is used to detect the sealing state between the connecting rod and the sealing lip; wherein, as the pushing device pushes the connecting rod to move, when the sealing detection device detects a change in the sealing state, the displacement detection device displays the failure offset of the oil seal. The present invention can accurately detect the offset of the shock absorber oil seal when it loses its sealing effect under the action of lateral force. By comparing the offset with the specified offset threshold, it can effectively identify whether the sealing performance of the oil seal meets the requirements, so as to ensure that qualified oil seals are used in shock absorbers and ensure the performance and service life of shock absorbers.

Description

Technical Field

[0001] The invention relates to the technical field of oil seal detection, in particular to a failure offset detection device and a failure offset detection method for a shock absorber oil seal. Background Art

[0002] The oil seal is a key component to ensure the sealing of the shock absorber, and is crucial to the reliable operation and service life of the shock absorber.

[0003] The oil seal of the shock absorber is a dynamic seal that automatically adjusts as the shock absorber operates, so both the stretch rate and the sealing performance must be taken into account. During the operation of the shock absorber, the oil seal will be affected by the lateral force. When the lateral force is too large, the oil seal will fail, causing oil and air leakage.

[0004] How to accurately detect the failure conditions of the oil seal under the action of lateral force to identify whether the sealing performance of the oil seal meets the requirements and ensure that qualified oil seals are used in the shock absorber to ensure the performance of the shock absorber is an urgent problem to be solved.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The present invention provides a failure offset detection device and a failure offset detection method for a shock absorber oil seal, which can accurately detect the offset of the shock absorber oil seal when it loses its sealing effect under the action of a lateral force. By comparing the offset with a specified offset threshold, it can be effectively identified whether the sealing performance of the oil seal meets the requirements, thereby ensuring that a qualified oil seal is used in the shock absorber, thereby ensuring the performance and service life of the shock absorber.

[0007] According to one aspect of the present invention, there is provided a device for detecting the failure offset of an oil seal of a shock absorber, comprising: a connecting rod, for passing through a central hole of the oil seal and sealingly abutting against a sealing lip of the oil seal; a pushing device, connected to the connecting rod and capable of radially pushing the connecting rod; a displacement detecting device, connected to the connecting rod or the pushing device; a sealing detecting device, for detecting the sealing state between the connecting rod and the sealing lip; wherein, as the connecting rod is pushed to move by the pushing device, when the sealing detecting device detects a change in the sealing state, the displacement detecting device displays the failure offset of the oil seal.

[0008] The above-mentioned failure offset detection device applies lateral force to the oil seal through a connecting rod that passes through the center hole of the oil seal and is in sealing contact with the sealing lip of the oil seal, and a pushing device that can radially push the connecting rod to move; in the process of the connecting rod pulling the oil seal laterally, the displacement detection device detects the offset of the oil seal under the action of the lateral force, and the sealing detection device detects the sealing state between the connecting rod and the sealing lip of the oil seal; when the sealing detection device detects a change in the sealing state, the detection value displayed by the displacement detection device is the failure offset of the oil seal, that is, the offset that causes the oil seal to lose its sealing effect under the action of the lateral force.

[0009] The above-mentioned failure offset detection device has a simple structure and is easy to operate. Through the cooperation of the connecting rod, the pushing device, the sealing detection device and the displacement detection device, it can accurately detect the offset of the shock absorber oil seal when it loses the sealing effect under the action of the lateral force. Comparing the offset with the specified offset threshold can effectively identify whether the sealing performance of the oil seal meets the requirements, thereby reducing the quality risk of unqualified products, ensuring that qualified oil seals are used in the shock absorber, and ensuring the performance and service life of the shock absorber.

[0010] In some embodiments, the failure offset detection device further includes: a test seat, which is provided with a test cavity, the oil seal is accommodated in the test cavity, and the test cavity is divided into a sealed cavity and an open cavity; wherein the sealing detection device is used to detect the sealing state of the sealed cavity.

[0011] The oil seal is stably placed through the test seat, and the oil seal divides the test cavity into a sealing cavity and an open cavity, so that the sealing state between the connecting rod and the sealing lip of the oil seal can be detected through the sealing cavity.

[0012] In some embodiments, the sealing detection device includes: air pressure formed in the sealed cavity and a liquid seal formed in the open cavity; and / or, air pressure formed in the sealed cavity and an air pressure sensor connected to the sealed cavity.

[0013] By inflating the sealing cavity and observing whether bubbles are generated in the liquid seal, or by inflating the sealing cavity and observing whether the detection data of the air pressure sensor changes, it is possible to accurately determine whether the seal between the connecting rod and the sealing lip of the oil seal has failed.

[0014] In some embodiments, the test seat includes: a base provided with a receiving groove for receiving the edge of the oil seal; and a cover plate, which is disposed on the base and can press the edge of the oil seal.

[0015] The base and the cover plate cooperate to facilitate the placement of the oil seal and to press the edge of the oil seal so as to detect the sealing state between the connecting rod and the sealing lip of the oil seal.

[0016] In some embodiments, the cover is screwed to the base via a plurality of first locking wrenches.

[0017] The cover plate can be conveniently locked and released by the first locking wrench.

[0018] In some embodiments, the sealing detection device includes: a distance sensor for detecting the gap between the connecting rod and the sealing lip.

[0019] By detecting the gap between the connecting rod and the sealing lip through a distance sensor and comparing the gap with the critical gap at which the oil seal loses its sealing effect, it is possible to accurately determine whether the sealing between the connecting rod and the sealing lip of the oil seal has failed.

[0020] In some embodiments, the pushing device includes: two push pins, respectively connected to the two ends of the connecting rod; a push plate, connected to the two push pins; and a push rod, connected to the push plate.

[0021] Through the two push pins connected to the two ends of the connecting rod respectively, the connecting rod can be pushed to move stably in the radial direction to stably apply lateral force to the oil seal; through the push plate and the push rod, the movement of the connecting rod can be easily controlled.

[0022] In some embodiments, a groove is provided at the end of the ejector pin, and the end of the connecting rod is received in the groove and abuts against the groove.

[0023] The design of the groove ensures that the top pin and the connecting rod are stably connected.

[0024] In some embodiments, a threaded hole is provided at the center of the push plate, and the push rod is a threaded rod.

[0025] The push rod and the push plate are screwed together to push the connecting rod to move accurately and smoothly.

[0026] In some embodiments, the pushing device is supported on a fixing seat, and the fixing seat is fixed to a base of the failure offset detection device.

[0027] The pushing device is stably supported on the base of the failure offset detection device through the fixing seat.

[0028] In some embodiments, the fixed seat is clamped in the limiting groove of the base and fixed to the base through an eccentric pin locking mechanism, and the eccentric pin locking mechanism includes: a cam, the fixed seat is provided with a step wall and a groove wall, the end face of the cam is pressed against the step wall, and the side face of the cam abuts against the groove wall; a second locking wrench, the cam is screwed to the base through the second locking wrench; wherein the direction of the force between the fixed seat and the limiting groove, the direction of the force between the end face of the cam and the step wall, and the direction of the force between the side face of the cam and the groove wall are perpendicular to each other.

[0029] The fixed seat is clamped in the limiting groove of the base, and the end face of the cam of the eccentric pin locking mechanism is pressed against the step wall of the fixed seat, and the side of the cam abuts against the groove wall of the fixed seat, so as to limit the movement of the fixed seat in the X, Y and Z three-dimensional directions. The cam is screwed to the base through a second locking wrench, and the tightness of the cam can be easily adjusted so that the fixed seat can be stably fixed to the base.

[0030] According to another aspect of the present invention, a method for detecting a failure offset of an oil seal of a shock absorber is provided. The method for detecting a failure offset is implemented based on a failure offset detection device as described in any of the above embodiments, and comprises: pushing the connecting rod to move by the pushing device so that the connecting rod pulls the oil seal laterally; detecting an offset of the connecting rod moved by the pushing device by the displacement detection device, and detecting a sealing state between the connecting rod and the sealing lip by the sealing detection device; when the sealing detection device detects a signal representing a change in the sealing state, reading a detection value of the displacement detection device as the failure offset of the oil seal.

[0031] The above-mentioned failure offset detection method is easy to operate. Through the cooperation of the connecting rod, the pushing device, the sealing detection device and the displacement detection device, the lateral force is stably applied to the shock absorber oil seal and the offset of the oil seal when it loses the sealing effect under the action of the lateral force can be accurately detected. By comparing the offset with the specified offset threshold, it can be effectively identified whether the sealing performance of the oil seal meets the requirements, so as to ensure that qualified oil seals are used in the shock absorber, thereby ensuring the performance and service life of the shock absorber.

[0032] In some embodiments, the signal characterizing the change in the sealing state includes: a signal indicating a change in the sealing state of the sealing cavity where the oil seal is located, and / or a signal indicating that the gap between the connecting rod and the sealing lip increases to a critical gap.

[0033] When the sealing detection device detects that the sealing state of the sealing cavity where the oil seal is located has changed, or detects that the gap between the connecting rod and the sealing lip of the oil seal has increased to a critical gap, it indicates that the oil seal has lost its sealing effect.

[0034] The beneficial effects of the present invention compared with the prior art include at least:

[0035] The failure offset detection device and the failure offset detection method provided by the present invention apply lateral force to the oil seal through a connecting rod that passes through the center hole of the oil seal and is in sealing contact with the sealing lip of the oil seal, and a pushing device that can radially push the connecting rod to move; in the process of the connecting rod pulling the oil seal laterally, the displacement detection device detects the offset of the oil seal under the action of the lateral force, and the sealing detection device detects the sealing state between the connecting rod and the sealing lip of the oil seal; when the sealing detection device detects a change in the sealing state, the detection value displayed by the displacement detection device is the failure offset of the oil seal, that is, the offset that causes the oil seal to lose its sealing effect under the action of the lateral force.

[0036] The failure offset detection device and the failure offset detection method provided by the present invention have a simple structure and are easy to operate. Through the cooperation of a connecting rod, a pushing device, a sealing detection device and a displacement detection device, the offset of the shock absorber oil seal when the shock absorber loses its sealing effect under the action of a lateral force can be accurately detected. Comparing the offset with a specified offset threshold can effectively identify whether the sealing performance of the oil seal meets the requirements, thereby ensuring that a qualified oil seal is used in the shock absorber and ensuring the performance and service life of the shock absorber.

[0037] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0039] Figure 1 A schematic cross-sectional structure diagram of a shock absorber oil seal is shown;

[0040] Figure 2 A schematic diagram showing the three-dimensional structure of a failure offset detection device for a shock absorber oil seal according to an embodiment of the present invention;

[0041] Figure 3 A schematic cross-sectional structure diagram of a failure offset detection device for a shock absorber oil seal according to an embodiment of the present invention is shown;

[0042] Figure 4 A schematic diagram showing an enlarged structure of an eccentric pin locking mechanism of a failure offset detection device according to an embodiment of the present invention;

[0043] Figure 5 A schematic diagram showing the steps of a method for detecting a failure offset of a shock absorber oil seal in an embodiment of the present invention;

[0044] Figure 6 A schematic diagram showing the steps of another method for detecting failure offset of a shock absorber oil seal in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein. Instead, these embodiments are provided to make the present invention comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0046] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. The processes shown in the accompanying drawings are only exemplary and do not necessarily include all the steps. For example, some steps can be decomposed, some steps can be combined or partially combined, and the actual execution order may change according to actual conditions. The words "first", "second" and similar words used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components.

[0047] It should be noted that, in the absence of conflict, the embodiments of the present invention and features in different embodiments may be combined with each other.

[0048] Figure 1 The cross-sectional structure of the shock absorber oil seal is shown. Figure 2 The three-dimensional structure of the failure offset detection device of the shock absorber oil seal is shown. Figure 3 The cross-sectional structure of the failure offset detection device of the shock absorber oil seal is shown; Figures 1 to 3 As shown, the failure offset detection device of the shock absorber oil seal provided by the embodiment of the present invention includes:

[0049] The connecting rod 20 is used to pass through the central hole 11 of the oil seal 10 and seal against the sealing lip 12 of the oil seal 10;

[0050] The pushing device 30 is connected to the connecting rod 20 and can push the connecting rod 20 to move radially;

[0051] A displacement detection device 40 connected to the connecting rod 20 or the pushing device 30;

[0052] A sealing detection device (not specifically shown in the figure), used to detect the sealing state between the connecting rod 20 and the sealing lip 12;

[0053] When the pushing device 30 pushes the connecting rod 20 to move and the sealing detection device detects a change in the sealing state, the displacement detection device 40 displays the failure offset of the oil seal 10 .

[0054] The above-mentioned failure offset detection device applies lateral force to the oil seal 10 through the connecting rod 20 that passes through the central hole 11 of the oil seal 10, is sealed against the sealing lip 12 of the oil seal 10, and the pushing device 30 that can radially push the connecting rod 20 to move; in the process of the connecting rod 20 pulling the oil seal 10 laterally, the displacement detection device 40 detects the offset of the oil seal 10 under the action of the lateral force, and the sealing detection device detects the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10; when the sealing detection device detects a change in the sealing state, the detection value displayed by the displacement detection device 40 is the failure offset of the oil seal 10, that is, the offset that causes the oil seal 10 to lose its sealing effect under the action of the lateral force.

[0055] The above-mentioned failure offset detection device has a simple structure and is easy to operate. Through the cooperation of the connecting rod 20, the pushing device 30, the sealing detection device and the displacement detection device 40, it can accurately detect the offset of the oil seal 10 of the shock absorber when it loses the sealing effect under the action of the lateral force. Comparing the offset with the specified offset threshold can effectively identify whether the sealing performance of the oil seal 10 meets the requirements. Specifically, if the detected failure offset of the oil seal 10 is greater than or equal to the specified offset threshold, it indicates that the sealing performance of the oil seal 10 meets the standard; and if the detected failure offset is less than the specified offset threshold, it indicates that the sealing performance of the oil seal 10 does not meet the standard. In this way, through detection, the quality risk of unqualified products can be reduced, ensuring that qualified oil seals 10 are used in shock absorbers, and ensuring the performance and service life of shock absorbers.

[0056] In some embodiments, the failure offset detection device also includes: a test seat 50, which is provided with a test cavity 55, the oil seal 10 is accommodated in the test cavity 55, and the test cavity 55 is divided into a sealed cavity 551 and an open cavity 552; wherein, the sealing detection device is used to detect the sealing state of the sealed cavity 551.

[0057] The test seat 50 can be fixed to the base 60 of the failure offset detection device by fastening bolts. The oil seal 10 is stably placed through the test seat 50, and the oil seal 10 divides the test cavity 55 into a sealing cavity 551 and an open cavity 552, so that the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10 can be detected through the sealing cavity 551.

[0058] In some embodiments, the sealing detection device includes: air pressure formed in the sealed cavity 551 and a liquid seal formed in the open cavity 552; and / or, air pressure formed in the sealed cavity 551 and an air pressure sensor connected to the sealed cavity 551.

[0059] By inflating the sealing cavity 551 and observing whether bubbles are generated in the liquid seal, or by inflating the sealing cavity 551 and observing whether the detection data of the air pressure sensor changes, it is possible to accurately determine whether the seal between the connecting rod 20 and the sealing lip 12 of the oil seal 10 fails.

[0060] In some embodiments, the test seat 50 includes: a base 51 provided with a receiving groove for receiving the edge 13 of the oil seal 10 ; and a cover plate 52 , which is covered on the base 51 and can press the edge 13 of the oil seal 10 .

[0061] The base 51 and the cover plate 52 cooperate to facilitate placement of the oil seal 10 and to press the edge 13 of the oil seal 10 so as to detect the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10 .

[0062] In some embodiments, the cover plate 52 is screwed to the base 51 through a plurality of first locking wrenches 53. The cover plate 52 can be conveniently locked and loosened through the first locking wrenches 53.

[0063] In some embodiments, the sealing detection device includes: a distance sensor for detecting the gap between the connecting rod 20 and the sealing lip 12 .

[0064] By detecting the gap between the connecting rod 20 and the sealing lip 12 through a distance sensor and comparing the gap with the critical gap at which the oil seal 10 loses its sealing effect, it is possible to accurately determine whether the sealing between the connecting rod 20 and the sealing lip 12 of the oil seal 10 has failed.

[0065] In some embodiments, the pushing device 30 includes: two push pins 32 connected to the two ends of the connecting rod 20 respectively; a push plate 33 connected to the two push pins 32; and a push rod 35 connected to the push plate 33.

[0066] Through the two push pins 32 respectively connected to the two ends of the connecting rod 20, the connecting rod 20 can be pushed to move stably in the radial direction to stably apply lateral force to the oil seal 10; through the push plate 33 and the push rod 35, the movement of the connecting rod 20 is conveniently controlled.

[0067] The displacement detection device 40 may be a micrometer connected to the push plate 33 , which can accurately detect the displacement of the connecting rod 20 pushed by the pushing device 30 .

[0068] In some embodiments, the end of the ejector pin 32 is provided with a slot, and the end of the connecting rod 20 is received in the slot and abuts against the slot. The ejector pin 32 is stably connected to the connecting rod 20 by the design of the slot.

[0069] In some embodiments, a threaded hole is provided at the center of the push plate 33, and the push rod 35 is a threaded rod. The push rod 35 is threadedly engaged with the push plate 33, and can accurately and stably push the connecting rod 20 to move.

[0070] In some embodiments, the pushing device 30 is supported on a fixing seat 62, and the fixing seat 62 is fixed to the base 60 of the failure offset detection device. Through the fixing seat 62, the pushing device 30 is stably supported on the base 60 of the failure offset detection device.

[0071] Figure 4 The enlarged structure of the eccentric pin locking mechanism of the failure offset detection device is shown; Figures 1 to 4 As shown, in some embodiments, the fixing seat 62 is clamped in the limiting groove 600 of the base 60 and fixed to the base 60 by an eccentric pin locking mechanism 66. The eccentric pin locking mechanism 66 includes:

[0072] The cam 662, the fixing seat 62 is provided with a step wall 622 and a groove wall 624, the end surface of the cam 662 is pressed against the step wall 622, and the side surface of the cam 662 is abutted against the groove wall 624;

[0073] A second locking wrench 663, the cam 662 is screwed to the base 60 through the second locking wrench 663;

[0074] The direction of the force between the fixing seat 62 and the limiting groove 600 , the direction of the force between the end surface of the cam 662 and the step wall 622 , and the direction of the force between the side surface of the cam 662 and the groove wall 624 are perpendicular to each other.

[0075] By clamping the fixed seat 62 in the limiting groove 600 of the base 60, the end face of the cam 662 of the eccentric pin locking mechanism 66 is pressed against the step wall 622 of the fixed seat 62, and the side of the cam 662 abuts against the groove wall 624 of the fixed seat 62, so as to limit the movement of the fixed seat 62 in the three-dimensional directions of X, Y, and Z. Specifically, the fixed seat 62 is clamped in the limiting groove 600, which can limit the movement of the fixed seat 62 in the X direction; the end face of the cam 662 is pressed against the step wall 622 of the fixed seat 62, which can limit the movement of the fixed seat 62 in the Z direction; the side of the cam 662 abuts against the groove wall 624 of the fixed seat 62, which can limit the movement of the fixed seat 62 in the Y direction. In this way, the fixed seat 62 is stably fixed to the base 60, and the cam 662 is screwed to the base 60 through the second locking wrench 663, so that the tightness of the cam 662 can be easily adjusted to achieve the fixation of the fixed seat 62.

[0076] An embodiment of the present invention also provides a method for detecting a failure offset of a shock absorber oil seal, which can be implemented based on the failure offset detection device described in any of the above embodiments to achieve accurate and convenient detection of the failure offset of the shock absorber oil seal.

[0077] Figure 5 The main steps of a method for detecting the failure offset of a shock absorber oil seal are shown; combined with Figures 1 to 5As shown, in some embodiments, a method for detecting a failure offset of a shock absorber oil seal includes:

[0078] S700a, pushing the connecting rod 20 to move by the pushing device 30, so that the connecting rod 20 pulls the oil seal 10 laterally;

[0079] S700b, detecting the displacement of the connecting rod 20 pushed by the pushing device 30 by the displacement detecting device 40, and detecting the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10 by the sealing detecting device;

[0080] S700c, when the sealing detection device detects a signal indicating a change in the sealing state, the detection value of the displacement detection device 40 is read as the failure offset of the oil seal 10.

[0081] The above-mentioned failure offset detection method is easy to operate. Through the cooperation of the connecting rod 20, the pushing device 30, the sealing detection device and the displacement detection device 40, a lateral force is stably applied to the oil seal 10 of the shock absorber and the offset of the oil seal 10 when the sealing effect is lost under the action of the lateral force can be accurately detected. By comparing the offset with the specified offset threshold, it can be effectively identified whether the sealing performance of the oil seal 10 meets the requirements, so as to ensure that a qualified oil seal 10 is used in the shock absorber, thereby ensuring the performance and service life of the shock absorber.

[0082] In some embodiments, the signal characterizing the change in the sealing state between the connecting rod 20 and the sealing lip 12 includes: a signal indicating a change in the sealing state of the sealing cavity 551 where the oil seal 10 is located, and / or a signal indicating that the gap between the connecting rod 20 and the sealing lip 12 increases to a critical gap.

[0083] When the sealing detection device detects that the sealing state of the sealing cavity 551 changes, or detects that the gap between the connecting rod 20 and the sealing lip 12 increases to a critical gap, it indicates that the oil seal 10 has lost its sealing effect.

[0084] Figure 6 The main steps of another method for detecting the failure offset of the shock absorber oil seal are shown; Figures 1 to 6 As shown, in an embodiment where the sealing detection device includes an air pressure formed in the sealing cavity 551 and a liquid seal formed in the open cavity 552, the failure offset detection method of the shock absorber oil seal may include the following steps.

[0085] S800a, ventilate the sealed cavity 551 to form air pressure, and inject water into the open cavity 552 to form a liquid seal. When forming air pressure, a certain amount of gas can be injected into the sealed cavity 551 through the gas port 550, and then the sealed cavity 551 is sealed.

[0086] S800b, push the connecting rod 20 to move by the pushing device 30, so that the connecting rod 20 pulls the oil seal 10 laterally. In specific implementation, the push rod 35 can be rotated to accurately and smoothly push the push plate 33 and the two ejector pins 32 to move in the radial direction; the connecting rod 20 will pull the oil seal 10 laterally during the movement, so that the oil seal 10 is eccentric.

[0087] S800c, using the displacement detection device 40 to detect the displacement of the connecting rod 20 pushed by the pushing device 30, and observe whether bubbles are generated in the liquid seal. When the connecting rod 20 pulls the oil seal 10 sideways to a certain extent, the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10 will change, which is manifested as bubbles in the liquid seal.

[0088] S800d, when bubbles are generated in the liquid seal, the detection value of the displacement detection device 40 is read as the failure offset of the oil seal 10.

[0089] In this way, through the cooperation of the connecting rod 20, the pushing device 30, the sealing detection device and the displacement detection device 40, based on the sealing detection principle of air pressure + liquid seal, the change in the sealing state of the sealing cavity 551 is used to cause the liquid seal to produce bubbles, and the displacement of the oil seal 10 when it loses its sealing effect under the action of lateral force can be detected conveniently and accurately.

[0090] In summary, the failure offset detection device and the failure offset detection method provided by the present invention apply lateral force to the oil seal 10 through the connecting rod 20 that passes through the center hole 11 of the oil seal 10, is sealed against the sealing lip 12 of the oil seal 10, and the pushing device 30 that can radially push the connecting rod 20 to move; in the process of the connecting rod 20 pulling the oil seal 10 laterally, the displacement detection device 40 detects the offset of the oil seal 10 under the action of the lateral force, and the sealing detection device detects the sealing state between the connecting rod 20 and the sealing lip 12 of the oil seal 10; when the sealing detection device detects a change in the sealing state, the detection value displayed by the displacement detection device 40 is the failure offset of the oil seal 10, that is, the offset that causes the oil seal 10 to lose its sealing effect under the action of the lateral force.

[0091] The failure offset detection device and the failure offset detection method provided by the present invention have a simple structure and are easy to operate. Through the cooperation of the connecting rod 20, the pushing device 30, the sealing detection device and the displacement detection device 40, the offset of the oil seal 10 of the shock absorber when it loses the sealing effect under the action of the lateral force can be accurately detected. By comparing the offset with the specified offset threshold, it can be effectively identified whether the sealing performance of the oil seal 10 meets the requirements, so as to ensure that the qualified oil seal 10 is used in the shock absorber, thereby ensuring the performance and service life of the shock absorber.

[0092] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A failure offset detection device for a shock absorber oil seal, characterized in that: include: A connecting rod, used to pass through the center hole of the oil seal and seal against the sealing lip of the oil seal; A pushing device connected to the connecting rod and capable of radially pushing the connecting rod, wherein the pushing device is supported by a fixing seat, and the fixing seat is fixed to a base of the failure offset detection device; The fixing seat is clamped in the limiting groove of the base and fixed to the base through an eccentric pin locking mechanism, and the eccentric pin locking mechanism comprises: a cam, the fixing seat is provided with a step wall and a groove wall, the end face of the cam is pressed against the step wall, and the side face of the cam is abutted against the groove wall; a second locking wrench, the cam is screwed to the base through the second locking wrench; wherein the direction of the force between the fixing seat and the limiting groove, the direction of the force between the end face of the cam and the step wall, and the direction of the force between the side face of the cam and the groove wall are perpendicular to each other; A displacement detection device connected to the connecting rod or the pushing device; A sealing detection device, used for detecting the sealing state between the connecting rod and the sealing lip; The test seat is provided with a test cavity, the oil seal is accommodated in the test cavity, and the test cavity is divided into a sealed cavity and an open cavity; The sealing detection device is used to detect the sealing state of the sealing cavity, and the sealing detection device includes: an air pressure formed in the sealing cavity and an air pressure sensor connected to the sealing cavity, and a distance sensor for detecting the gap between the connecting rod and the sealing lip; Wherein, as the pushing device pushes the connecting rod to move, when the sealing detection device detects that the sealing state has changed, the displacement detection device displays the failure offset of the oil seal.

2. The failure offset detection device according to claim 1, characterized in that: The sealing detection device also includes: The air pressure formed in the sealed cavity and the liquid seal formed in the open cavity.

3. The failure offset detection device according to claim 1, characterized in that: The test socket comprises: A base, provided with a receiving groove for receiving the edge of the oil seal; The cover plate is arranged on the base and can press the edge of the oil seal tightly.

4. The failure offset detection device according to claim 3, characterized in that: The cover plate is screwed to the base through a plurality of first locking wrenches.

5. The failure offset detection device according to claim 1, characterized in that: The pushing device comprises: Two ejector pins are respectively connected to two ends of the connecting rod; A push plate connected to the two ejector pins; A push rod is connected with the push plate.

6. The failure offset detection device according to claim 5, characterized in that: The end of the ejector pin is provided with a cutting groove, and the end of the connecting rod is accommodated in the cutting groove and abuts against the cutting groove.

7. The failure offset detection device according to claim 5, characterized in that: A threaded hole is arranged at the center of the push plate, and the push rod is a threaded rod.

8. A method for detecting failure offset of a shock absorber oil seal, characterized in that: The failure offset detection device according to any one of claims 1 to 7 is implemented, comprising: The fixing seat for supporting the pushing device is fixed to the base through an eccentric pin locking mechanism; The connecting rod is pushed to move by the pushing device so that the connecting rod pulls the oil seal laterally; The displacement detection device is used to detect the displacement of the connecting rod pushed by the pushing device, and the sealing state between the connecting rod and the sealing lip is detected by the sealing detection device; When the sealing detection device detects a signal indicating a change in the sealing state, the offset detected by the displacement detection device is read as a failure offset of the oil seal; Among them, the signal characterizing the change in the sealing state includes: a signal of a change in the sealing state of the sealing cavity where the oil seal is located, detected by an air pressure sensor, and / or a signal of an increase in the gap between the connecting rod and the sealing lip to a critical gap, detected by a distance sensor.

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