Car door anti-collision protector

Abstract

The present invention discloses a vehicle door anti-collision protector, comprising a vehicle door, a vehicle body, a drive mechanism, a protection mechanism, an adjustment mechanism, and a buffer mechanism. The vehicle door comprises an outer door panel and an inner door panel, and the drive mechanism is installed between the outer door panel and the inner door panel. The protection mechanism comprises a protector, which is arranged at the rear of the outer door panel and connected to the drive mechanism. The drive mechanism comprises a limiter, a first pull rod, a steering gear, and a second pull rod. Point A of the limiter is fixed to the vehicle body, and point B is connected to the first pull rod. The steering gear comprises a guide rod and a rotating shaft, and the steering gear is fixed to the inner door panel. One end of the guide rod is connected to the first pull rod, and the other end is connected to the second pull rod. The other end of the second pull rod is connected to the protector. The present invention adopts a mechanical structure, which is simple and reliable, low in cost, has a small number of parts, a low failure rate, and high feasibility. It can be installed when the vehicle leaves the factory, avoiding the need for the owner to install additional structures later.

Description

Technical Field

[0001] The invention relates to a vehicle door anti-collision protector, belonging to the technical field of automobile parts. Background Art

[0002] In the field of automotive door protection, in addition to fixed structures such as the vehicle's built-in door lower anti-scratch plates, car owners typically use protective pads, car covers, or car films to protect the door edges from damage caused by bumps and obstacles when the door is opened. Currently, existing door anti-scratch protection devices are relatively complex in structure, requiring sensors, motors, and other components. They are large and difficult to deploy, are costly, and have low reliability, making them difficult to mass-produce. As a result, there are no widely used door anti-scratch protection devices. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a vehicle door anti-collision protector to address the defects of the existing technology, and to provide a protective mechanism to prevent the edge of the vehicle door from colliding with obstacles during the vehicle door opening process.

[0004] In order to solve this technical problem, the present invention provides a vehicle door anti-collision protector, which includes a vehicle door, a vehicle body, a driving mechanism, a protection mechanism, an adjustment mechanism and a buffer mechanism. The vehicle door includes a vehicle door outer panel and a vehicle door inner panel, and the driving mechanism is installed between the vehicle door outer panel and the vehicle door inner panel; the protection mechanism includes a protector, which is arranged at the rear of the vehicle door outer panel and connected to the driving mechanism, and is hidden between the vehicle door and the vehicle body when the door is closed; the driving mechanism includes a limiter, a pull rod 1, a steering gear and a pull rod 2, and point A of the limiter is fixed on the vehicle body, and point B is connected to the vehicle body. The steering gear includes a guide rod and a rotating shaft, and the steering gear is fixed to the inner panel of the vehicle door. One end of the guide rod is connected to the pull rod 1, and the other end is connected to the pull rod 2, and the other end of the pull rod 2 is connected to the protector; when the vehicle door is opened and rotated, the limiter drives the pull rod 1 to move, and the pull rod 1 pulls the guide rod to make the steering gear rotate around the rotating shaft, and the other end of the guide rod pushes the pull rod 2; the protector is connected to the pull rod 2, and when the door is opened, the driving mechanism pushes it out of the vehicle door through the pull rod 2, and the protruding position of the vehicle door edge is covered by the two-link structure to achieve the protection purpose.

[0005] The protector includes a guide rod, a limit block, a guide, a guard plate, a torsion spring, an axis and a roller, one end of the guide rod is connected to the pull rod 2 of the drive structure, and can rotate relative to it; the guide is fixed inside the door structure; the guard plate is hingedly connected to the guide rod and can rotate relative to it; the guard plate is installed with a torsion spring at the hinge with the guide rod, one end of the torsion spring is fixed on the guide rod, and the other end is fixed on the guard plate. The torsion force of the torsion spring causes the guard plate to generate a self-rotating torque, and when the door is opened without any obstacles, it bends and covers the outer panel of the door, and fits tightly against the outer panel of the door to play a protective role.

[0006] The center of the guide is provided with a square through hole, the shape of which matches the outer contour of the guide rod. The guide rod moves linearly through the central through hole of the guide, and the guide plays a role in guiding the movement of the guide rod.

[0007] The front section of the guard plate is connected to a number of rollers via an axis, and when the guard plate is extended, rolling occurs between the rollers and the vehicle door, thereby avoiding excessive resistance when extending.

[0008] The guard plate is made of a soft, wear-resistant rubber material. When the car door is opened, it extends out and covers the outer panel of the car door to provide protection.

[0009] The roller is made of a soft, wear-resistant rubber material to avoid damage to the vehicle door.

[0010] The adjusting mechanism includes a steering gear, which plays an adjusting role; the steering gear includes a rotating shaft, a guide rod, a pin, an adjustment hole, an inner fixing block and an outer fixing block, the inner fixing block serves as a base to fix the steering gear on the inner panel of the vehicle door, and the rotating shaft rotates in the hole positions of the inner fixing block and the outer fixing block; the pin fixes the guide rod on the rotating shaft, and the outer fixing block plays the role of fixing and pressing the rotating shaft and the guide rod; a number of adjustment holes are distributed on the guide rod, and the pin fixes the guide rod on the hole position of the rotating shaft after passing through the adjustment hole. The selection of the adjustment hole can adjust the length ratio of the A and B sections of the guide rod, which will determine the ratio of the translational movement distance of the pull rod one to the translational movement distance of the pull rod two; during the door opening process, the angle at which the protector reaches the fully extended state can be adjusted by adjusting the length ratio of the A section and the B section of the guide rod, so that the rotation angle of the door pulled by the driving mechanism and the extension position of the push protector reach a suitable ratio.

[0011] The adjustment mechanism adjusts the length ratio of section A and section B of the guide rod so that the protector does not extend out of the vehicle door 1 within α degrees of door opening, and the protector reaches the working state and plays a protective role when the door is opened to β degrees, where β is greater than α, the maximum opening angle of the vehicle door is γ degrees, and γ≥β.

[0012] Furthermore, the adjustment mechanism adjusts the length ratio of section A and section B of the guide rod so that the protector does not extend out of the door within 10 degrees of door opening, and reaches the working state when the door is opened 45 degrees, thereby playing a protective role.

[0013] The buffer mechanism includes a pull rod 2, which plays a buffering role; the pull rod 2 includes a pull rod 2a, a guide tube, a compression spring and a pull rod 2b; when the car door is opened to an angle β and the protector is fully functional, the car door continues to open, and the compression spring is deformed, so that the pull rod 2a continues to push, and the pull rod 2b does not move, and the compression of the compression spring offsets the translational movement; the guide tube plays a guiding role for the compression spring; during the door closing process, the compression spring first releases the deformation, and then connects the pull rod 2a and the pull rod 2b to move together, retracting the protector and completing the complete door opening and closing movement process.

[0014] Beneficial Effects: Compared to existing protectors that rely on sensors, motors, and other mechanisms, this invention adopts a mechanical structure, resulting in reliability, durability, and a low failure rate. When the door is statically closed, the protector is concealed within the vehicle door structure, without affecting the exterior appearance. The protector utilizes a simple two-link structure, resulting in a simple and reliable structure, low cost, a small number of parts, and high implementability. The protector can be adjusted to determine the door opening angle at which it activates, enabling different protection positions for vehicles with different uses and scenarios. This invention can be installed at the factory, eliminating the need for owners to retrofit the structure later. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the protection method of the present invention;

[0017] Figure 3 This is a schematic diagram of the driving principle of the present invention;

[0018] Figure 4 This is an exploded schematic diagram of the structure of the present invention;

[0019] Figure 5 This is a schematic diagram of the door closing working principle of the present invention;

[0020] Figure 6 This is a schematic diagram of the working process of the present invention;

[0021] Figure 7 This is a schematic diagram of the door opening working principle of the present invention;

[0022] Figure 8 Schematic diagram of the limiting structure of the present invention;

[0023] Figure 9 This is a schematic diagram of the adjustment and buffering mechanism of the present invention;

[0024] Figure 10 It is a structural schematic diagram of the commutator of the present invention.

[0025] In the figure: 1. Vehicle door; 2. Vehicle door outer panel; 3. Vehicle door inner panel; 4. Vehicle body; 5. Limiter; 6. Tie rod 1; 7. Steering gear; 8. Tie rod 2; 9. Protector; 10. Guide rod; 11. Limit block; 12. Guide; 13. Guard plate; 14. Torsion spring; 15. Shaft; 16. Roller; 17. Tie rod 2a; 18. Guide tube; 19. Compression spring; 20. Tie rod 2b; 21. Rotating shaft; 22. Guide rod; 23. Pin; 24. Adjustment hole; 25. Inner fixing block; 26. Outer fixing block. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] like Figures 1-10 As shown, the present invention provides a vehicle door anti-collision protector, including a vehicle door 1, a vehicle body 4, a driving mechanism, a protection mechanism, an adjustment mechanism and a buffer mechanism, the vehicle door 1 includes a vehicle door outer panel 2 and a vehicle door inner panel 3, the driving mechanism is installed between the vehicle door outer panel 2 and the vehicle door inner panel 3; the protection mechanism includes a protector 9, which is arranged at the rear of the vehicle door outer panel 2 and connected to the driving mechanism. When the door is closed, it is hidden between the vehicle door 1 and the vehicle body 4 and does not affect the appearance; the driving mechanism includes a limiter 5, a pull rod 1 6, a deflector 7 and a pull rod 2 8, point A of the limiter 5 is fixed on the vehicle body 4, and point B is connected to the pull rod 1 6; the deflector 7 includes a guide rod 22 and a rotating shaft 21, the deflector 7 is fixed on the vehicle door inner panel 3, one end of the guide rod 22 is connected to the pull rod 1 6, and the other end is connected to the pull rod 2 8, and the other end of the pull rod 2 8 is connected to the protector 9.

[0028] The driving working principle is as follows: the movement process of the driving mechanism when opening the door is as follows: point A of the limiter 5 is fixed on the vehicle body 4 and does not move. When the door 1 is opened and rotated, the gap between the door 1 and the vehicle body 4 becomes larger due to the rotation of the door 1. Therefore, point B of the limiter 5 moves relative to the inside of the door along the Figure 3 Move in the direction of the middle arrow (from right to left); the pull rod 16 is connected to the point B of the limiter 5, and the movement of the limiter 5 drives the pull rod 16 along Figure 3 The direction of the arrow is from right to left; the steering gear 7 is fixed to the door 1, and one end of the guide rod 22 of the steering gear 7 is connected to the pull rod 1 6 and the other end is connected to the pull rod 2 8. The guide rod 22 of the steering gear 7 rotates around the shaft 21. Figure 3 Rotate in the direction of the arrow (clockwise), the other end of the guide rod 22 will move the connected pull rod 8 along Figure 3 Push in the direction of the middle arrow (from left to right), the other end of the pull rod 2 8 is connected to the protector 9. When opening the door, the driving mechanism pushes it out of the car door 1 through the pull rod 2 8, and then pushes the protector 9 out of the car door, thereby covering the protruding position of the edge of the car door 1 and playing a protective role; the driving direction is opposite when closing the door.

[0029] The protector 9 includes a guide rod 10, a limit block 11, a guide 12, a guard plate 13, a torsion spring 14, an axis 15 and a roller 16. One end of the guide rod 10 is connected to the pull rod 2 8 of the drive mechanism and can rotate relative to it; the guide 12 is fixed inside the structure of the car door 1 to provide directional guidance and structural support for the guide rod 10; the guard plate 13 is hingedly connected to the guide rod 10 and can rotate relative to it; the guard plate 13 is installed with a torsion spring 14 at the hinge with the guide rod 10, one end of the torsion spring 14 is fixed on the guide rod 10, and the other end is fixed on the guard plate 13. Since the guide rod 10 cannot rotate after passing through the square through hole in the center of the guide 12 and can only move linearly in a fixed direction, the torsion force of the torsion spring 14 causes the guard plate 13 to generate a self-rotating torque, which bends and covers the car door outer panel 2 when the car door is opened without any obstacles, and is close to the car door outer panel 2 to play a protective role.

[0030] The guide 12 has a square through hole at its center, the shape of which matches the outer contour of the guide rod 10 . The guide rod 10 moves linearly through the central through hole of the guide 12 , and the guide 12 guides the movement of the guide rod 10 .

[0031] The front section of the guard plate 13 is connected to a plurality of rollers 16 via a shaft 15 . When the guard plate 13 is extended, rolling occurs between the rollers 16 and the vehicle door 1 , thereby avoiding excessive resistance during extension.

[0032] The guard plate 13 is made of a soft, wear-resistant rubber material. When the door is opened, it extends out and covers the door outer panel 2 to provide protection.

[0033] The roller 16 is made of a soft, wear-resistant rubber material to avoid damage to the vehicle door.

[0034] During the initial movement of the door opening process, the protection mechanism is still inside the door mechanism and has not yet extended; Figure 5 Schematic diagram of the door closing working principle, the guide rod 10 and the pull rod 2 8 in the driving mechanism are pushed along the guide direction of the guide 12 and extended in a fixed direction, the guard plate 13 extends outward and rotates around the hinge point with the guide rod 10 under the torsion of the torsion spring 14 and always adheres to the door inner panel 3, at this time the roller 16 rolls around the axis 15 and along the inner wall of the door 1; after the door is opened to a certain angle, the protection mechanism is in the process of operation but has not yet been fully in place; Figure 6 Schematic diagram of the working process, at this time, the guard plate 13 is pushed forward (from left to right) out of the car door, and generates torque (clockwise) to bend under the action of the torsion spring 14. Due to the obstruction of the car door outer panel 2, it has not been completely bent and covered on the car door outer panel 2; when the door is opened to the next fixed angle β, the protection mechanism is in a fully working state, as shown in FIG. Figure 7Schematic diagram of the door opening principle. At this point, the front end of the guide rod 10 is also pushed out of the door. The guard plate 13, under the action of the torsion spring 14, generates torque (clockwise), bending and covering the door outer panel 2. Simultaneously, the roller 16 also contacts the door outer panel 2, preventing the guard plate 13 from being completely parallel to the door outer panel 2. Instead, it is at a certain angle. This prevents the guard plate 13 from being unable to retract due to the small angle between the guide rod 10 during door closing. At this time, the soft material roller 16 and guard plate 13 also serve as door protection. During the door closing process, the drive mechanism and protection mechanism move in the opposite direction.

[0035] The adjusting mechanism includes a steering gear 7, which plays an adjusting role; the steering gear 7 includes a rotating shaft 21, a guide rod 22, a pin 23, an adjustment hole 24, an inner fixing block 25 and an outer fixing block 26, the inner fixing block 25 serves as a base to fix the steering gear 7 on the inner door panel 3, and the rotating shaft 21 rotates in the holes of the inner fixing block 25 and the outer fixing block 26; the pin 23 fixes the guide rod 22 on the rotating shaft 21, and the outer fixing block 26 plays a role in fixing and pressing the rotating shaft 21 and the guide rod 22; the guide rod 22 is fixed to the rotating shaft 21, and the outer fixing block 26 plays a role in fixing and pressing the rotating shaft 21 and the guide rod 22; There are several adjustment holes 24 distributed, and the pin 23 passes through the adjustment hole 24 to fix the guide rod 22 on the hole position of the rotating shaft 21. The selection of the adjustment hole 24 can adjust the length ratio of the A and B sections of the guide rod 22, which will determine the ratio of the translational movement distance of the pull rod 1 6 and the translational movement distance of the pull rod 2 8; during the door opening process, the angle at which the protector reaches the fully extended state can be adjusted by adjusting the length ratio of the A and B sections of the guide rod 22, so that the rotation angle of the door pulled by the drive mechanism and the extension position of the push protector 9 reach a suitable ratio.

[0036] The adjustment mechanism adjusts the length ratio of sections A and B of the guide rod 22 so that the protector 9 does not extend outside the vehicle door 1 within α degrees of door opening, and is fully operational and protective when the door is opened β degrees, where β is greater than α. The maximum door opening angle is γ degrees, with γ ≥ β. For example, the adjustment mechanism adjusts the length ratio of sections A and B of the guide rod 22 so that the protector 9 does not extend outside the vehicle door 1 within 10 degrees of door opening, and is fully operational and protective when the door is opened 45 degrees. The angle selection can be adjusted based on the actual vehicle model.

[0037] The buffer mechanism includes a pull rod 2 8, which plays a buffering role; the pull rod 2 8 includes a pull rod 2 a17, a guide tube 18, a compression spring 19 and a pull rod 2 b20; when the car door is opened to an angle β and the protector 9 is fully functional, the limit block 11 interferes with the guide 12, so that the guide rod 10 cannot continue to extend forward, thereby preventing the roller 16 and the guard plate 13 from exerting pressure on the car door outer panel 2 and causing damage; the car door continues to open, and the compression spring 19 deforms, so that the pull rod 2 a17 continues to push, and the pull rod 2 b20 does not move, and the compression spring 19 compresses to offset the translational movement; wherein the guide tube 18 plays a guiding role for the compression spring 19 to avoid instability and bending; during the door closing process, the compression spring 19 first releases the deformation, and then connects the pull rod 2 a17 and the pull rod 2 b20 to move together, retracting the protector 9, and completing the complete door opening and closing movement process.

[0038] During actual use, the protector 9 needs to play a protective role when the car door 1 is opened to a certain angle before it is fully opened. Therefore, the door opening angle at which the protector 9 plays a full role needs to be adjusted according to the vehicle model or usage scenario. After the protector 9 plays a full role, the car door 1 continues to open and it is necessary to ensure that the protector 9 does not continue to move. Therefore, between the door opening angle where the protector 9 is fully in place and the door opening to the maximum angle, a buffer mechanism is required to absorb the movement of the limiter 5 caused by the continued opening of the door, so that the protector 9 no longer continues to move.

[0039] Compared to existing protectors that rely on sensors, motors, and other mechanisms, this invention adopts a mechanical structure, which is reliable, durable, and has a low failure rate. When the door is statically closed, it is hidden within the vehicle door structure, without affecting the appearance. The protector has a simple two-link structure, which is simple and reliable, low cost, has a small number of parts, and is highly implementable. The protector can be adjusted to determine the door opening angle at which it will activate, thereby achieving different protection positions for vehicles with different uses and usage scenarios. This invention can be installed at the factory, eliminating the need for owners to install additional components later.

[0040] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A car door anti-collision protector, characterized by: The invention comprises a vehicle door (1), a vehicle body (4), a driving mechanism, a protection mechanism, an adjustment mechanism and a buffer mechanism, wherein the vehicle door (1) comprises a vehicle door outer panel (2) and a vehicle door inner panel (3), and the driving mechanism is installed between the vehicle door outer panel (2) and the vehicle door inner panel (3); the protection mechanism comprises a protector (9), which is arranged at the rear of the vehicle door outer panel (2) and connected to the driving mechanism, and is hidden between the vehicle door (1) and the vehicle body (4) when the door is closed; the driving mechanism comprises a limiter (5), a pull rod 1 (6), a steering gear (7) and a pull rod 2 (8), wherein point A of the limiter (5) is fixed on the vehicle body (4), and point B is connected to the pull rod 1 (6); the steering gear ( 7) includes a guide rod (22) and a rotating shaft (21), the steering gear (7) is fixed on the inner panel of the door (3), one end of the guide rod (22) is connected to the pull rod 1 (6), and the other end is connected to the pull rod 2 (8), and the other end of the pull rod 2 (8) is connected to the protector (9); when the door (1) is opened and rotated, the limiter (5) drives the pull rod 1 (6) to move, and the pull rod 1 (6) pulls the guide rod (22) to make the steering gear (7) rotate around the rotating shaft (21), and the other end of the guide rod (22) pushes the pull rod 2 (8); the protector (9) is connected to the pull rod 2 (8), and when the door is opened, the driving mechanism pushes it out of the door (1) through the pull rod 2 (8), and the two-link structure is used to realize the protection. The protruding position of the edge of the vehicle door (1) is now covered to achieve the purpose of protection; the regulating mechanism includes a steering gear (7), and the steering gear (7) plays an regulating role; the steering gear (7) includes a rotating shaft (21), a guide rod (22), a pin (23), an adjustment hole (24), an inner fixing block (25) and an outer fixing block (26), the inner fixing block (25) serving as a base to fix the steering gear (7) on the inner panel (3) of the vehicle door, and the rotating shaft (21) rotates in the holes of the inner fixing block (25) and the outer fixing block (26); the pin (23) fixes the guide rod (22) on the rotating shaft (21), and the outer fixing block (26) plays a role in fixing the rotating shaft (21), the guide rod (22) and the outer fixing block (26). The rod (22) has the function of fixing and pressing; a plurality of adjustment holes (24) are distributed on the guide rod (22), and the pin (23) is passed through the adjustment hole (24) to fix the guide rod (22) on the hole position of the rotating shaft (21). The selection of the adjustment hole (24) can adjust the length ratio of the A and B sections of the guide rod (22), and determine the ratio of the translational movement distance of the pull rod 1 (6) to the translational movement distance of the pull rod 2 (8); in the process of opening the door, the angle at which the protector (9) reaches the fully extended state can be adjusted by adjusting the length ratio of the A and B sections of the guide rod (22), so that the rotation angle of the door pulled by the driving mechanism and the extension position of the push protector (9) reach a suitable ratio.

2. The vehicle door anti-collision protector according to claim 1, characterized in that: The protector (9) comprises a guide rod (10), a limit block (11), a guide (12), a guard plate (13), a torsion spring (14), a shaft (15) and a roller (16), wherein one end of the guide rod (10) is connected to the second pull rod (8) of the driving mechanism and can rotate relative to each other; the guide (12) is fixed inside the vehicle door (1) structure; the guard plate (13) is hingedly connected to the guide rod (10) and can rotate relative to each other; a torsion spring (14) is installed at the hinge of the guard plate (13) with the guide rod (10), one end of the torsion spring (14) is fixed to the guide rod (10), and the other end is fixed to the guard plate (13), the torsion of the torsion spring (14) causes the guard plate (13) to generate a self-rotating torque, and when the vehicle door is opened without any obstacles, the guard plate (13) is bent and covers the vehicle door outer panel (2) and is closely attached to the vehicle door outer panel (2) to play a protective role.

3. The door anti-collision protector according to claim 2, characterized in that: The guide (12) is provided with a square through hole at its center, the shape of which matches the outer profile of the guide rod (10). The guide rod (10) moves in a straight line when passing through the central through hole of the guide (12). The guide (12) serves as a motion guide for the guide rod (10).

4. The vehicle door anti-collision protector according to claim 2, characterized in that: The front section of the guard plate (13) is connected to a plurality of rollers (16) via a shaft (15). When the guard plate (13) is extended, rolling occurs between the rollers (16) and the vehicle door (1), thereby avoiding excessive resistance when extending.

5. The vehicle door anti-collision protector according to claim 2, characterized in that: The guard plate (13) is made of a soft, wear-resistant rubber material and extends out when the door is opened and covers the door outer panel (2) to provide protection.

6. The vehicle door anti-collision protector according to claim 2, characterized in that: The roller (16) is made of a soft, wear-resistant rubber material to avoid damage to the vehicle door.

7. The vehicle door anti-collision protector according to claim 1, characterized in that: The regulating mechanism adjusts the length ratio of the section A and the section B of the guide rod (22) so that the protector (9) does not extend out of the vehicle door (1) within the door opening α degrees, and the protector (9) reaches the working state and plays a protective role when the door is opened β degrees, wherein β is greater than α; the maximum opening angle of the vehicle door is γ degrees, and γ≥β.

8. The vehicle door anti-collision protector according to claim 1, characterized in that: The regulating mechanism adjusts the length ratio of the A section and the B section of the guide rod (22) so that the protector (9) does not extend out of the vehicle door (1) within 10 degrees of door opening, and the protector (9) reaches the working state when the door is opened 45 degrees, thereby playing a protective role.

9. The vehicle door anti-collision protector according to any one of claims 1 to 8, characterized in that: The buffer mechanism includes a pull rod 2 (8), and the pull rod 2 (8) plays a buffering role; the pull rod 2 (8) includes a pull rod 2a (17), a guide tube (18), a compression spring (19) and a pull rod 2b (20); when the car door is opened to an angle β, the protector (9) plays a full function, the car door continues to open, the compression spring (19) is deformed, so that the pull rod 2a (17) continues to push, the pull rod 2b (20) does not move, and the compression spring (19) is compressed to offset the translational movement; wherein the guide tube (18) plays a guiding role for the compression spring (19); during the door closing process, the compression spring (19) first releases the deformation, and then connects the pull rod 2a (17) and the pull rod 2b (20) to move together, retracting the protector (9), completing the complete door opening and closing movement process.

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