Automatic tightening device for shock absorber dust cover

Abstract

The present invention relates to an automatic tightening device for a shock absorber dust cover, comprising a base, one end of the base being provided with a shock absorber clamping mechanism, the other end of the base being fixedly mounted with a driving motor, a friction torque limiter being connected to the rotating shaft of the driving motor, an end of the friction torque limiter being away from the driving motor being connected with a speed torque sensor, an end of the speed torque sensor being away from the friction torque limiter being connected with a tightening head, an end of the tightening head being away from the speed torque sensor being provided with a rectangular groove for a hanging ring on the dust cover of the shock absorber to be clamped into; when the speed torque sensor detects that the tightening torque reaches the assembly process requirement of the dust cover and the dust cover cover, the input end and the output end of the friction torque limiter are disconnected, and the driving motor keeps idling, thereby meeting the tightening torque requirement of the dust cover and the dust cover cover.

Description

Technical Field

[0001] The present invention relates to the technical field of shock absorbers, and in particular to an automatic tightening device for a shock absorber dust cover. Background Art

[0002] Shock absorbers are key components of high-speed trains, and their damping characteristics play a crucial role in the smooth operation of high-speed trains. The dust cover of the shock absorber plays a vital role throughout its operation. As the name suggests, the dust cover is for dust protection, but this is far more than just dust protection. In addition to dust protection, the shock absorber dust cover also serves a protective function, protecting the shock absorber from dust and ensuring that it maintains optimal operating condition. Most people believe that the shock absorber dust cover is not that important among the entire shock absorber component. In fact, the opposite is true. Failure to pay attention to the use of the shock absorber dust cover can lead to damage to the entire shock absorber, and the shock absorber's vibration isolation effect will be less obvious.

[0003] The tightening process for the shock absorber dust cover and dust cover is essentially about meeting the specified tightening torque for the dust cover and dust cover within the specified assembly process. Too loose a tightening torque can cause the dust cover to fall off during operation, while overtightening can also negatively impact the shock absorber's performance. Therefore, there is an urgent need to ensure that the tightening torque for the dust cover meets the specified process requirements while also improving assembly efficiency, reducing labor intensity, and achieving assembly automation.

[0004] Currently, there is no dedicated equipment for tightening dust covers and dust cover caps in China. Manual tightening is used in production, and the tightening torque does not meet the process requirements, resulting in either overtightening or underloosening. This results in extremely low production efficiency, seriously affecting production capacity. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an automatic tightening device for a shock absorber dust cover, which adopts a speed torque sensor combined with a friction torque limiter to well control the size of the tightening torque of the dust cover, and at the same time realizes the automatic tightening of the dust cover to solve the problems in the prior art.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: an automatic tightening device for a shock absorber dust cover, comprising a base, one end of the base is provided with a shock absorber clamping mechanism, the other end of the base is fixedly mounted with a drive motor, a friction torque limiter is connected to the rotating shaft of the drive motor, the end of the friction torque limiter away from the drive motor is connected to a speed torque sensor, the end of the speed torque sensor away from the friction torque limiter is connected to a tightening head, and the end of the tightening head away from the speed torque sensor is provided with a rectangular groove for the hanging ring on the dust cover of the shock absorber to be clamped into.

[0007] As an optimal technical solution, the shock absorber clamping mechanism includes a lower support seat, a vertical plate is fixedly installed on one side of the lower support seat, a top plate is fixedly installed on the top of the vertical plate, a downward extending cylinder is fixedly installed on the top plate, an upper pressure seat is fixedly installed on the telescopic rod of the cylinder, and the top of the lower support seat and the bottom of the upper pressure seat are respectively provided with arc grooves for clamping the shock absorber.

[0008] As a further improvement, a transversely extending slide groove is provided on the base, and the lower support seat is slidably installed in the slide groove. The lower support seat slides along the slide groove to enable the hanging ring on the dust cover to be clamped into or out of the rectangular groove.

[0009] As a further improvement, a support plate is fixedly mounted on the base, the support plate is located on the side of the lower support seat away from the tightening head, a hydraulic cylinder is provided between the support plate and the lower support seat, the cylinder body of the hydraulic cylinder is fixedly mounted on the support plate, and a support spring is connected between the telescopic rod of the hydraulic cylinder and the lower support seat.

[0010] As a further improvement, a rack extending along its length is fixedly installed at the bottom of the slide groove, and an avoidance groove for the rack to pass through is provided at the corresponding position of the lower support seat and the rack, and a horizontal shaft is rotatably installed in the avoidance groove, and a gear matching the rack is coaxially fixedly installed on the horizontal shaft; a mounting cavity is provided in the lower support seat, one end of the horizontal shaft extends into the mounting cavity and is coaxially fixedly installed with a ratchet, and a pawl matching the ratchet is provided in the mounting cavity, and one end of the pawl is rotatably installed in the mounting cavity through a small shaft, and the pawl is engaged with the ratchet to limit the lower support seat from sliding to the side away from the tightening head, and a linkage mechanism for driving the pawl to engage or disengage with the ratchet is provided in the lower support seat.

[0011] As a preferred technical solution, the linkage mechanism includes a swing plate fixedly mounted on one end of the pawl close to the small shaft, the swing plate and the pawl are located in the same plane, an auxiliary cavity is provided in the lower support seat, the auxiliary cavity is provided with a through hole extending downward and connected to the mounting cavity, a movable column is movably installed in the through hole, a long strip hole is provided on the swing plate for the movable column to pass through, a first baffle located in the mounting cavity is fixedly mounted on the lower end of the movable column, a first spring located between the swing plate and the first baffle is sleeved on the movable column, the swing plate is pushed to rotate upward by the first spring to engage the pawl with the ratchet, and the upper end of the movable column is fixed A metal block is installed in the auxiliary cavity, and an electromagnet for adsorbing the metal block is fixedly installed on the top of the auxiliary cavity; a limit plate is fixedly installed in the auxiliary cavity through a support rod, and a avoidance hole is provided on the limit plate for the movable column to pass through; a second baffle located in the auxiliary cavity is fixedly installed on the movable column, and the second baffle is located below the limit plate, and a second spring is sleeved on the movable column and located between the limit plate and the second baffle; a third baffle located in the installation cavity is also fixedly installed on the movable column, and the third baffle is located above the swing plate, and the swing plate is pushed downward by the third baffle to separate the pawl from the ratchet.

[0012] As a further improvement, a rubber pad is provided in the arc-shaped groove.

[0013] As a further improvement, a sleeve is fixedly mounted on a side of the lower support seat away from the tightening head, and the telescopic rod of the hydraulic cylinder is movably mounted in the sleeve.

[0014] Due to the adoption of the above technical solution, an automatic tightening device for a shock absorber dust cover includes a base, one end of the base is provided with a shock absorber clamping mechanism, the other end of the base is fixedly mounted with a drive motor, a friction torque limiter is connected to the rotating shaft of the drive motor, an end of the friction torque limiter away from the drive motor is connected to a speed torque sensor, an end of the speed torque sensor away from the friction torque limiter is connected to a tightening head, and an end of the tightening head away from the speed torque sensor is provided with a rectangular groove for receiving a lifting ring on the dust cover of the shock absorber;

[0015] When the speed torque sensor detects that the tightening torque reaches the assembly process requirement of the dust cover and the dust cover cover, the input end and the output end of the friction torque limiter are disconnected, and the drive motor remains idling, thereby meeting the requirement of reducing the tightening torque of the dust cover and the dust cover cover, realizing the automation of the tightening of the dust cover cover, enabling the tightening torque of the dust cover cover to be accurately controlled, ensuring the qualified tightening torque of the dust cover, and improving product quality.

[0016] According to the present invention, when the angle of the lifting ring on the dust cover is inconsistent with that of the rectangular groove, the hydraulic cylinder pushes the lifting ring on the dust cover through the support spring to abut against the left end of the rectangular groove and prevent it from entering. When the driving motor drives the tightening head to rotate until the angle of the rectangular groove is consistent with that of the lifting ring on the dust cover, the elastic force of the support spring causes the lifting ring on the dust cover to automatically snap into the rectangular groove, thereby eliminating the need to deliberately keep the angle of the lifting ring on the dust cover consistent with that of the rectangular groove when clamping the shock absorber. This simplifies the assembly steps, reduces labor intensity, and improves work efficiency.

[0017] The driving motor of the present invention drives the tightening head to tighten the dust cover and the dust cover cover, and at the same time, the electromagnet is energized to engage the pawl with the ratchet, thereby limiting the lower support seat from moving to the left and away from the tightening head, preventing the lifting ring on the dust cover cover from detaching from the rectangular groove during the tightening process, thereby improving the stability of the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the shock absorber structure.

[0020] Figure 2 It is a structural diagram of an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of an embodiment of the present invention where the lifting ring is against the left end of the rectangular slot and cannot enter;

[0022] Figure 4 2 is a schematic structural diagram of a tightening head according to an embodiment of the present invention;

[0023] Figure 5 is a structural schematic diagram of a shock absorber clamping mechanism according to an embodiment of the present invention;

[0024] Figure 6 yes Figure 5 Middle AA cross-sectional view;

[0025] Figure 7 2 is a schematic diagram of the pawl and the ratchet wheel when they are engaged with each other according to an embodiment of the present invention.

[0026] In the figure: 1-base; 2-drive motor; 3-friction torque limiter; 4-speed torque sensor; 5-tightening head; 6-rectangular groove; 7-lower support seat; 8-vertical plate; 9-top plate; 10-cylinder; 11-upper pressure seat; 12-arc groove; 13-slide; 14-support plate; 15-hydraulic cylinder; 16-support spring; 17-rack; 18-avoidance groove; 19-horizontal axis; 20-gear; 21-mounting cavity; 22-ratchet; 23-pawl; 24-small Shaft; 25-swing plate; 26-auxiliary chamber; 27-through hole; 28-movable column; 29-first baffle; 30-first spring; 31-metal block; 32-electromagnet; 33-limiting plate; 34-second baffle; 35-second spring; 36-third baffle; 37-rubber pad; 38-sleeve; 39-long strip hole; 40-shock absorber; 401-working cylinder component; 402-oil storage cylinder base; 403-dust cover; 404-dust cover cover; 405-lifting ring. DETAILED DESCRIPTION

[0027] like Figures 1 to 7 As shown, an automatic tightening device for a shock absorber dust cover comprises a base 1, one end of the base 1 is provided with a shock absorber clamping mechanism, the other end of the base 1 is fixedly mounted with a drive motor 2, a friction torque limiter 3 is connected to the rotating shaft of the drive motor 2, the end of the friction torque limiter 3 away from the drive motor 2 is connected to a speed torque sensor 4, the end of the speed torque sensor 4 away from the friction torque limiter 3 is connected to a tightening head 5, and the end of the tightening head 5 away from the speed torque sensor 4 is provided with a rectangular groove 6 for receiving a hanging ring 405 on the dust cover 404 of the shock absorber 40.

[0028] like Figure 1 As shown, the shock absorber 40 includes a working cylinder component 401, an oil storage cylinder base 402, a dust cover 403, and a dust cover 404. The oil storage cylinder base 402 and the dust cover 404 are respectively provided with a lifting ring 405.

[0029] When in use, the dust cover 403 of the shock absorber 40 is clamped by the shock absorber clamping mechanism, and the ring 405 on the dust cover 404 is clamped into the rectangular groove 6 of the tightening head 5, as shown in FIG. Figure 2As shown, the drive motor 2 is energized and drives the friction torque limiter 3 to rotate, and the friction torque limiter 3 transmits the speed and torque to the speed torque sensor 4. The speed torque sensor 4 drives the tightening head 5 to rotate, and the tightening head 5 drives the dust cover 404 to rotate relative to the dust cover 403 through the hanging ring 405 on the dust cover 404; when the speed torque sensor 4 detects that the tightening torque reaches the assembly process requirement of the dust cover 403 and the dust cover 404, the input and output ends of the friction torque limiter 3 are disconnected, and the drive motor 2 keeps idling, thereby meeting the requirement of reducing the tightening torque of the dust cover 403 and the dust cover 404.

[0030] like Figure 5 As shown, the shock absorber clamping mechanism includes a lower support seat 7, a vertical plate 8 is fixedly installed on one side of the lower support seat 7, a top plate 9 is fixedly installed on the top of the vertical plate 8, a downwardly extending cylinder 10 is fixedly installed on the top plate 9, an upper pressure seat 11 is fixedly installed on the telescopic rod of the cylinder 10, and the top of the lower support seat 7 and the bottom of the upper pressure seat 11 are respectively provided with an arc groove 12 for clamping the shock absorber 40.

[0031] The base 1 is provided with a transversely extending slide groove 13 , and the lower support seat 7 is slidably installed in the slide groove 13 . The lower support seat 7 slides along the slide groove 13 so that the lifting ring on the dust cover is clamped into or out of the rectangular groove 6 .

[0032] A support plate 14 is fixedly mounted on the base 1, and the support plate 14 is located on the side of the lower support seat 7 away from the tightening head 5. A hydraulic cylinder 15 is provided between the support plate 14 and the lower support seat 7, and the cylinder body of the hydraulic cylinder 15 is fixedly mounted on the support plate 14, and a support spring 16 is connected between the telescopic rod of the hydraulic cylinder 15 and the lower support seat 7.

[0033] When clamping the shock absorber 40, place the shock absorber 40 in the arc groove 12 of the lower support seat 7, and drive the upper pressure seat 11 downward by extending the cylinder 10, so that the arc groove 12 at the bottom of the upper pressure seat 11 is buckled on the top of the shock absorber 40, as shown in FIG. Figure 2 As described above, the dust cover 403 of the shock absorber 40 is clamped by the upper pressure seat 11 and the lower support seat 7 .

[0034] Then the hydraulic cylinder 15 extends and pushes the lower support seat 7 to the right, closer to the tightening head 5, through the support spring 16. If the angle of the ring 405 on the dust cover 404 is consistent with the angle of the rectangular groove 6 when the shock absorber 40 is clamped, the hydraulic cylinder 15 pushes the lower support seat 7 to the right, closer to the tightening head 5, through the support spring 16, and the lower support seat 7 directly drives the ring 405 on the dust cover 404 to be clamped into the rectangular groove 6. Figure 2 shown.

[0035] If the angle of the lifting ring 405 on the dust cover 404 is inconsistent with that of the rectangular groove 6 when the shock absorber 40 is clamped, the hydraulic cylinder 15 pushes the lower support seat 7 to the right toward the side close to the tightening head 5 through the support spring 16, and the lifting ring 405 on the dust cover 404 abuts against the left end of the rectangular groove 6 and cannot enter, and the lower support seat 7 stops moving to the right toward the side close to the tightening head 5, thereby compressing the support spring 16. Figure 3 As shown; the driving motor 2 is then energized to drive the tightening head 5 to rotate. When the tightening head 5 rotates to the point where the angle of the rectangular groove 6 is consistent with the angle of the hanging ring 405 on the dust cover 404, the compressed support spring 16 stretches and continues to push the lower support seat 7 to the right to move closer to the side of the tightening head 5, so that the hanging ring 405 on the dust cover 404 is automatically stuck in the rectangular groove 6.

[0036] A rack 17 extending along its length is fixedly installed at the bottom of the slide groove 13, and an avoidance groove 18 for the rack 17 to pass through is provided at the corresponding position of the lower support seat 7 and the rack 17, and a transverse shaft 19 is rotatably installed in the avoidance groove 18, and a gear 20 matching the rack 17 is coaxially fixedly installed on the transverse shaft 19; a mounting cavity 21 is provided in the lower support seat 7, one end of the transverse shaft 19 extends into the mounting cavity 21 and is coaxially fixedly installed with a ratchet 22, and a pawl 23 matching the ratchet 22 is provided in the mounting cavity 21, and one end of the pawl 23 is rotatably installed in the mounting cavity 21 through a small shaft 24, and the pawl 23 engages with the ratchet 22 to limit the lower support seat 7 from sliding to the side away from the tightening head 5, and a linkage mechanism for driving the pawl 23 to engage or disengage with the ratchet 22 is provided in the lower support seat 7.

[0037] Specifically, when the hydraulic cylinder 15 is extended, the support spring 16 pushes the lower support seat 7 to move to the right, toward the side close to the tightening head 5, and then drives the gear 20 to rotate clockwise through the rack 17, and the gear 20 drives the horizontal shaft 19 and the ratchet 22 to rotate clockwise; or when the hydraulic cylinder 15 is contracted, the support spring 16 pulls the lower support seat 7 to move to the left, away from the tightening head 5, and then drives the gear 20 to rotate counterclockwise through the rack 17, and the gear 20 drives the horizontal shaft 19 and the ratchet 22 to rotate counterclockwise.

[0038] The linkage mechanism includes a swing plate 25 fixedly mounted on one end of the pawl 23 close to the small shaft 24, the swing plate 25 and the pawl 23 are located in the same plane, an auxiliary cavity 26 is provided in the lower support seat 7, the auxiliary cavity 26 is provided with a through hole 27 extending downward and communicating with the mounting cavity 21, a movable column 28 is movably installed in the through hole 27, the swing plate 25 is provided with a long strip hole 39 for the movable column 28 to pass through, the lower end of the movable column 28 is fixedly mounted with a first baffle 29 located in the mounting cavity 21, the movable column 28 is sleeved with a first spring 30 located between the swing plate 25 and the first baffle 29, the swing plate 25 is pushed to rotate upward by the first spring 30 to engage the pawl 23 with the ratchet 22, and the upper end of the movable column 28 is fixedly mounted with a first spring 30 located in the mounting cavity 21 The metal block 31 in the auxiliary cavity 26 is fixedly installed with an electromagnet 32 ​​on the top of the auxiliary cavity 26 for adsorbing the metal block 31; a limit plate 33 is fixedly installed in the auxiliary cavity 26 through a support rod, and the limit plate 33 is provided with an avoidance hole for the movable column 28 to pass through; a second baffle 34 located in the auxiliary cavity 26 is fixedly installed on the movable column 28, and the second baffle 34 is located below the limit plate 33; a second spring 35 is sleeved on the movable column 28 and is located between the limit plate 33 and the second baffle 34; a third baffle 36 located in the installation cavity 21 is also fixedly installed on the movable column 28, and the third baffle 36 is located above the swing plate 25, and the swing plate 25 is pushed downward by the third baffle 36 to separate the pawl 23 from the ratchet 22.

[0039] In the initial state, if Figure 6 As shown, the electromagnet 32 ​​is in a power-off state. At this time, the second baffle 34 is pushed down to the bottom of the auxiliary cavity 26 by the second spring 35. The second baffle 34 drives the movable column 28 to move downward. The movable column 28 drives the swing plate 25 to rotate downward through the third baffle 36 to separate the pawl 23 from the ratchet 22. At the same time, the movable column 28 drives the metal block 31 to move downward and separate from the electromagnet 32.

[0040] After the shock absorber 40 is clamped, the hydraulic cylinder 15 is extended to drive the lower support seat 7 to move rightward toward the side of the tightening head 5, so that the ring 405 on the dust cover 404 is stuck in the rectangular groove 6. When the lower support seat 7 moves rightward toward the side of the tightening head 5, it drives the gear 20, the horizontal shaft 19 and the ratchet 22 to rotate clockwise; then the driving motor 2 is energized to drive the tightening head 5 to rotate and tighten the dust cover 403 and the dust cover 404. When the driving motor 2 is energized, the electromagnet 32 ​​is energized. Figure 7As shown, after the electromagnet 32 ​​is energized, the metal block 31 is attracted and moved upward, and the metal block 31 drives the movable column 28 to move upward, and the movable column 28 drives the second baffle 34 to move upward to compress the second spring 35. At the same time, the movable column 28 drives the third baffle 36 to move upward and separate from the swing plate 25. At the same time, the movable column 28 drives the first baffle 29 to move upward, and the first baffle 29 pushes the swing plate 25 to rotate upward through the first spring 30 to engage with the ratchet 22. After the pawl 23 engages with the ratchet 22, the ratchet 22 is restricted from rotating counterclockwise. The ratchet 22 restricts the gear 20 from rotating counterclockwise through the horizontal shaft 19, thereby restricting the lower support seat 7 from moving to the left and away from the tightening head 5, thereby preventing the lifting ring 405 on the dust cover 404 from separating from the rectangular groove 6 during the tightening process.

[0041] When the tightening torque of the dust cover 403 and the dust cover cover 404 reaches the requirement, the drive motor 2 is powered off, the tightening head 5 stops rotating, and the electromagnet 32 ​​is powered off at the same time. The elastic force of the second spring 35 separates the pawl 23 from the ratchet 22, thereby preventing the pawl 23 from restricting the ratchet 22, the horizontal shaft 19 and the gear 20 from rotating counterclockwise; then the hydraulic cylinder 15 contracts and drives the lower support seat 7 to move to the left and away from the tightening head 5, so that the lifting ring 405 on the dust cover cover 404 is separated from the rectangular groove 6, and finally the cylinder 10 contracts and drives the upper pressure seat 11 to move upward to release the shock absorber 40.

[0042] Similarly, if the hydraulic cylinder 15 is extended to drive the lower support seat 7 to move to the right toward the side of the tightening head 5, the ring 405 on the dust cover 404 is against the left end of the rectangular groove 6 and cannot enter. After the driving motor 2 and the electromagnet 32 ​​are energized, the pawl 23 engages with the ratchet 22, and the pawl 23 will not limit the clockwise rotation of the ratchet 22. Then, when the driving motor 2 drives the tightening head 5 to rotate until the angle of the rectangular groove 6 is consistent with the angle of the ring 405 on the dust cover 404, the compressed support spring 16 extends and continues to push the lower support seat 7 to move to the right toward the side of the tightening head 5. The ring 405 on the dust cover 404 can still be automatically stuck in the rectangular groove 6, and can prevent the ring 405 on the dust cover 404 from detaching from the rectangular groove 6 during the tightening process.

[0043] A rubber pad 37 is provided in the arc-shaped groove 12 to prevent the upper pressure seat 11 and the lower support seat 7 from damaging the shock absorber 40 .

[0044] A sleeve 38 is fixedly mounted on the side of the lower support seat 7 away from the tightening head 5. The telescopic rod of the hydraulic cylinder 15 is movably mounted in the sleeve 38. The sleeve 38 is used to guide the support spring 16 to prevent the support spring 16 from bending.

[0045] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic tightening device for a shock absorber dust cover, characterized by: The invention comprises a base, one end of which is provided with a shock absorber clamping mechanism, the other end of which is fixedly mounted with a drive motor, a friction torque limiter connected to the rotating shaft of the drive motor, an end of the friction torque limiter away from the drive motor being connected to a speed torque sensor, an end of the speed torque sensor away from the friction torque limiter being connected to a tightening head, and an end of the tightening head away from the speed torque sensor being provided with a rectangular groove for receiving a lifting ring on a dust cover of the shock absorber; The shock absorber clamping mechanism includes a lower support seat, a vertical plate is fixedly mounted on one side of the lower support seat, a top plate is fixedly mounted on the top of the vertical plate, a downwardly extending cylinder is fixedly mounted on the top plate, an upper pressure seat is fixedly mounted on the telescopic rod of the cylinder, and an arc groove for clamping the shock absorber is respectively provided on the top of the lower support seat and the bottom of the upper pressure seat; The base is provided with a transversely extending slide groove, and the lower support seat is slidably installed in the slide groove, and the lower support seat slides along the slide groove to enable the lifting ring on the dust cover to be clamped into or out of the rectangular groove; A support plate is fixedly mounted on the base, the support plate is located on a side of the lower support seat away from the tightening head, a hydraulic cylinder is provided between the support plate and the lower support seat, the cylinder body of the hydraulic cylinder is fixedly mounted on the support plate, and a support spring is connected between the telescopic rod of the hydraulic cylinder and the lower support seat; The bottom of the slide groove is fixedly installed with a rack extending along its length direction, and the lower support seat is provided with an avoidance groove for the rack to pass through at the corresponding position of the rack, and a cross shaft is rotatably installed in the avoidance groove, and a gear matching the rack is coaxially fixedly installed on the cross shaft; a mounting cavity is provided in the lower support seat, one end of the cross shaft extends into the mounting cavity and is coaxially fixedly installed with a ratchet, and the mounting cavity is provided with a pawl matching the ratchet. One end of the pawl is rotatably installed in the mounting cavity through a small shaft, and the pawl is meshed with the ratchet to limit the lower support seat from sliding to the side away from the tightening head. A linkage mechanism is provided in the lower support seat for driving the pawl to engage or disengage with the ratchet; A rubber pad is arranged in the arc groove.

2. The automatic tightening device for a shock absorber dust cover according to claim 1, characterized in that: The linkage mechanism includes a swing plate fixedly mounted on one end of the pawl near the small shaft, the swing plate and the pawl are located in the same plane, an auxiliary cavity is provided in the lower support seat, the auxiliary cavity is provided with a through hole extending downward and connected to the mounting cavity, a movable column is movably installed in the through hole, and a long strip hole is provided on the swing plate for the movable column to pass through, a first baffle located in the mounting cavity is fixedly mounted on the lower end of the movable column, and a first spring located between the swing plate and the first baffle is sleeved on the movable column, and the swing plate is pushed upward by the first spring to engage the pawl with the ratchet, and the upper end of the movable column is fixedly mounted with a The metal block in the auxiliary cavity is fixedly installed on the top of the auxiliary cavity with an electromagnet for adsorbing the metal block; a limit plate is fixedly installed in the auxiliary cavity through a support rod, and the limit plate is provided with an avoidance hole for the movable column to pass through; a second baffle located in the auxiliary cavity is fixedly installed on the movable column, and the second baffle is located below the limit plate; a second spring located between the limit plate and the second baffle is sleeved on the movable column; a third baffle located in the installation cavity is also fixedly installed on the movable column, and the third baffle is located above the swing plate, and the swing plate is pushed downward by the third baffle to separate the pawl from the ratchet.

3. The automatic tightening device for a shock absorber dust cover according to claim 1, characterized in that: A sleeve is fixedly mounted on one side of the lower support seat away from the tightening head, and the telescopic rod of the hydraulic cylinder is movably mounted in the sleeve.

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