Anti-trailing door

Abstract

The utility model relates to an anti-trailing door. The anti-trailing door comprises a first door leaf, a second door leaf and a connecting rod mechanism, one end of the connecting rod mechanism is arranged opposite to the first door leaf, the other end of the connecting rod mechanism is arranged opposite to the limiting hole of the second door leaf, and the connecting rod mechanism is connected to a first door frame corresponding to the first door leaf through an elastic component; when the first door leaf is opened, the elastic component restores, the other end of the connecting rod mechanism is inserted into the limiting hole, so that the second door leaf cannot be opened, when the first door leaf is closed, the elastic component is compressed, the other end of the connecting rod mechanism retreats from the limiting hole, and the second door leaf can be opened. And it is ensured that the first door and the second door cannot be opened at the same time. The anti-trailing door solves the problem that the existing anti-trailing door cannot work normally under the condition that the power is interrupted or an electric control system goes wrong, so that the safety and the effectiveness of an access control system are influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of protective doors, in particular to an anti-tailgating door. Background Art

[0002] With the continuous progress of society and the rapid advancement of technology, anti-theft systems are constantly undergoing technological innovation and functional upgrades to meet increasingly complex security needs. Against this backdrop, anti-tailgating doors, as a highly effective physical security measure, are widely used in banks, financial institutions, and key government agencies and departments. To prevent and deter criminal activity and avert major public security incidents, these institutions have implemented a variety of security measures, including the installation of riot and burglary-resistant doors. The primary function of anti-tailgating doors is to physically block potential criminals from entering, thereby safeguarding the personnel and assets within.

[0003] Currently, various security door manufacturers offer their own unique anti-tailgating door solutions. These doors typically feature two doors, front and back, locked by side locks and typically controlled by an electronic control system. This design effectively prevents unauthorized access under normal circumstances. However, in the event of a power outage or electronic control system failure, the anti-tailgating door may not function properly, directly impacting the security and effectiveness of the access control system. Therefore, to ensure safety, a more reliable backup mechanical locking mechanism is urgently needed to ensure that the anti-tailgating door can function effectively in all circumstances, providing a safer environment for people. Utility Model Content

[0004] In view of this, the purpose of the present invention is to provide an anti-tailgating door to solve the problem that the existing anti-tailgating door cannot work normally when there is a power outage or a problem with the electronic control system, thereby affecting the safety and effectiveness of the access control system.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0006] An anti-tailgating door comprises a first door, a second door and a connecting rod mechanism;

[0007] One end of the connecting rod mechanism is arranged opposite to the first door, and the other end is arranged opposite to the limiting hole of the second door. The connecting rod mechanism is connected to the first door frame corresponding to the first door through an elastic component;

[0008] When the first door is opened, the elastic component is restored, and the other end of the connecting rod mechanism is inserted into the limiting hole, so that the second door cannot be opened. When the first door is closed, the elastic component is compressed, and the other end of the connecting rod mechanism is withdrawn from the limiting hole, so that the second door can be opened, ensuring that the first door and the second door cannot be opened at the same time.

[0009] According to the above technical means, by providing a connecting rod mechanism and an elastic component, and cooperating with a limit hole provided on the second door, when the first door is opened, the gap between the first door and the first door frame increases, the elastic component recovers, and pushes the connecting rod mechanism connected to the elastic component to move. The connecting rod mechanism is actuated and moves toward the second door leaf, so that the other end of the connecting rod mechanism is inserted into the limit hole of the second door, preventing the second door from opening. When the first door is closed, the gap between the first door and the first door frame decreases, the elastic component is compressed, and the connecting rod mechanism connected to the elastic component moves in the opposite direction. The connecting rod mechanism is actuated and moves away from the second door leaf, so that the other end of the connecting rod mechanism is withdrawn from the limit hole of the second door, allowing the second door to open. This ensures that the first door and the second door cannot be opened at the same time, ensuring that the anti-tailgating door can perform its due function in any situation, providing people with a safer environment. This effectively solves the problem that the existing anti-tailgating door cannot work properly in the event of power outage or problem with the electronic control system, thereby affecting the safety and effectiveness of the access control system.

[0010] Preferably, one side of the first door frame is hinged to the first door, and the elastic component is provided on the other side near the top of the first door.

[0011] Preferably, the connecting rod mechanism includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod;

[0012] One end of the first connecting rod is arranged opposite to the first door, and the other end is connected to one end of the second connecting rod;

[0013] The other end of the second connecting rod is connected to one end of the third connecting rod;

[0014] The other end of the third connecting rod is connected to one end of the fourth connecting rod;

[0015] The other end of the fourth connecting rod is arranged opposite to the limiting hole of the second door.

[0016] By setting the connecting rod mechanism into four connecting rods, a compact design of the anti-tailgating door is achieved, which effectively reduces the occupied space and is suitable for use in limited spaces; the design of the connecting rod mechanism improves the stability of the door leaf, reduces the shaking of the door leaf caused by external forces, and enhances the overall performance of the door; the anti-tailgating door can effectively prevent the door leaf from being forced open through the linkage action of the connecting rod mechanism, thereby improving the safety performance of the door; the length and angle of the connecting rod mechanism can be adjusted according to actual needs, making the opening and closing angle and speed of the door more flexible, adapting to the needs of different usage scenarios; due to the relatively simple structure of the connecting rod mechanism, daily maintenance and troubleshooting are relatively easy, reducing maintenance costs; the connecting rod mechanism is usually made of metal material, which has good wear resistance and durability, and extends the service life of the door.

[0017] Preferably, one end of the elastic component is connected to the other end of the first connecting rod, and the other end is connected to the first door frame.

[0018] Preferably, a first fixing bracket is provided on the second connecting rod, and the second connecting rod and the first fixing bracket are in sliding fit.

[0019] Preferably, a second fixing bracket is provided on the third connecting rod, and the third connecting rod and the second fixing bracket are in sliding fit.

[0020] Typically, the first fixing bracket and the second fixing bracket are fixed on a wall.

[0021] Preferably, a sliding guide rail is mounted on the second connecting rod, so that the first fixing bracket can slide back and forth on the sliding guide rail.

[0022] Preferably, a sliding guide rail is installed on the third connecting rod, so that the second fixing bracket can slide back and forth on the sliding guide rail.

[0023] The installation of sliding rails on the second connecting rod improves the door's flexibility and adaptability, allowing the door leaf to open and close more smoothly, reducing noise and wear caused by friction or jamming. The sliding rail design effectively absorbs and disperses the impact force generated by the door leaf during opening and closing, extending the door's service life. The sliding rail also facilitates maintenance and replacement of the door leaf, improving maintenance efficiency and reducing maintenance costs.

[0024] Preferably, a first guide sleeve is sleeved on the first connecting rod, and the first guide sleeve is fixed on the first door frame.

[0025] Preferably, a second guide sleeve is sleeved on the second connecting rod, and the second guide sleeve is fixed on a second door frame corresponding to the second door.

[0026] By installing a guide sleeve on the first connecting rod and / or the second connecting rod, the friction between the connecting rod and the door frame is effectively reduced, and the opening and closing flexibility of the door is improved; at the same time, the guide sleeve is fixed to the door frame, which helps to maintain the stability and guidance of the connecting rod, thereby ensuring that the door leaf remains stable during the opening and closing process, reducing noise and wear, and extending the service life of the door.

[0027] Preferably, one side of the second door frame is hinged to the second door, and the other side of the second door frame is provided with the second guide sleeve near the top of the second door.

[0028] Preferably, the first guide sleeve is welded to the first door frame.

[0029] By welding the first guide sleeve to the first door frame, the stability of the first guide sleeve is effectively guaranteed.

[0030] Preferably, the second guide sleeve is welded to the second door frame.

[0031] By welding the second guide sleeve to the second door frame, the stability of the second guide sleeve is effectively guaranteed.

[0032] Preferably, the elastic component is selected from a spring, one end of the spring is connected to the other end of the first connecting rod, and the other end of the spring is connected to the first door frame.

[0033] Preferably, the second door frame is a hollow cavity structure, the portion where the third connecting rod and the fourth connecting rod are connected is located in the hollow cavity of the second door frame, and a portion of the second guide sleeve is located in the hollow cavity of the second door frame.

[0034] Preferably, a first through hole and a second through hole are provided on the cavity wall of the second door frame, the third connecting rod is passed through the first through hole, and the second guide sleeve is passed through the second through hole.

[0035] By designing the second door frame as a hollow cavity structure, portions of the third and fourth connecting rods can be concealed within the door frame, shielding them from the external environment and enhancing the door's safety and aesthetics. Furthermore, the through-holes provided in the cavity wall of the second door frame ensure a smooth connection between the connecting rod and guide sleeve while maintaining the overall stability of the door's structure. This not only improves the door's durability but also helps reduce maintenance costs, as wear and damage to the internal mechanical components are less susceptible to external environmental influences. Furthermore, the concealed design may also offer a certain degree of anti-theft benefits, as the internal mechanical structure is difficult for external observers to directly see, making it more difficult for potential intruders to crack the door lock.

[0036] Preferably, the first door frame is a hollow cavity structure, the elastic component is provided in the hollow cavity of the first door frame, and the other end of the elastic component is fixedly connected to the inner wall of the cavity of the first door frame.

[0037] Preferably, a third through hole and a fourth through hole are provided on the cavity wall of the first door frame, the second connecting rod is passed through the third through hole, and the first guide sleeve is passed through the fourth through hole.

[0038] By adopting a hollow cavity structure for the first door frame, not only is the overall weight of the door reduced, but installation space is also provided for the internal elastic components, making the door structure more compact and reasonable. The elastic component is located in the hollow cavity, with one end connected to the connecting rod mechanism and the other end fixed to the inner wall of the cavity. At the same time, one end of the connecting rod mechanism is designed to be opposite to the door frame, which can effectively absorb and cushion the impact force when closing the door, reduce noise, and extend the service life of the door. By providing third and fourth through-holes in the cavity wall of the first door frame, the second connecting rod and the first guide sleeve can be precisely installed, ensuring the stability and accuracy of the door leaf during the opening and closing process, and improving the performance of the door. The combination of the hollow cavity structure and the internal elastic components can, to a certain extent, prevent the door frame from deforming due to external forces, enhance the structural stability of the door, and thus improve the safety performance of the anti-tailgating door. Since key components such as the elastic components and connecting rods are located inside the door frame, daily inspection and maintenance are facilitated, while also reducing the wear and tear on these components caused by the external environment, thereby extending the service life of the door.

[0039] Preferably, the other end of the first connecting rod is hinged to one end of the second connecting rod.

[0040] Preferably, the other end of the second connecting rod is hinged to one end of the third connecting rod.

[0041] Preferably, the other end of the third connecting rod is hinged to one end of the fourth connecting rod.

[0042] Beneficial effects of the utility model:

[0043] The anti-tailgating door of the present invention is provided with a connecting rod mechanism and an elastic component, and cooperates with the limiting hole provided on the second door, so that when the first door is opened, the gap between the first door and the first door frame increases, the elastic component recovers, and pushes the connecting rod mechanism connected to the elastic component to move. The connecting rod mechanism is driven and moves in a direction close to the second door leaf, so that the other end of the connecting rod mechanism is inserted into the limiting hole of the second door, so that the second door cannot be opened. When the first door is closed, the gap between the first door and the first door frame is reduced, the elastic component is compressed, and pushes the connecting rod mechanism connected to the elastic component to move in the opposite direction. The connecting rod mechanism is driven and moves in a direction away from the second door leaf, so that the other end of the connecting rod mechanism is withdrawn from the limiting hole of the second door, so that the second door can be opened, thereby ensuring that the first door and the second door cannot be opened at the same time, ensuring that the anti-tailgating door can play its due role under any circumstances, and providing people with a safer environment. The invention effectively solves the problem that the existing anti-tailgating door cannot work normally in the case of power outage or problem with the electric control system, thereby affecting the safety and effectiveness of the access control system. In the field of protective door technology, the invention has promotion and application value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a schematic diagram of the structure of the anti-tailgating door of the present invention (the first door is open, the second door is closed, and the elastic component is restored);

[0045] Figure 2 This is a schematic diagram of the structure of the anti-tailgating door of the present invention (the first door is closed, the second door is open, and the elastic component is compressed);

[0046] Figure 3 Schematic diagram of the structure of the anti-tailgating door of the present invention (first door closed, second door closed and elastic component compressed);

[0047] Among them, 1-first door; 2-second door; 3-connecting rod mechanism, 31-first connecting rod, 32-second connecting rod, 33-third connecting rod, 34-fourth connecting rod, 35-sliding guide rail; 4-first door frame, 41-third through hole, 42-fourth through hole; 5-elastic component; 6-first fixed bracket; 7-second fixed bracket; 8-first guide sleeve; 9-second guide sleeve; 10-second door frame, 101-first through hole, 102-second through hole. DETAILED DESCRIPTION

[0048] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended solely to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0049] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. Therefore, the drawings only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated. Example

[0050] like Figures 1 to 3 As shown, an anti-tailgating door includes a first door 1, a second door 2 and a connecting rod mechanism 3;

[0051] One end of the connecting rod mechanism 3 is arranged opposite to the first door 1, and the other end is arranged opposite to the limiting hole 21 of the second door 2. The connecting rod mechanism 3 is connected to the first door frame 4 corresponding to the first door 1 through the elastic component 5;

[0052] When the first door 1 is opened, the elastic component 5 is restored, and the other end of the connecting rod mechanism 3 is inserted into the limiting hole 21, so that the second door 2 cannot be opened. When the first door 1 is closed, the elastic component 5 is compressed, and the other end of the connecting rod mechanism 3 is withdrawn from the limiting hole 21, so that the second door 2 can be opened, ensuring that the first door 1 and the second door 2 cannot be opened at the same time.

[0053] By providing a connecting rod mechanism and an elastic component, and cooperating with a limiting hole provided on the second door, when the first door is opened, the gap between the first door and the first door frame increases, the elastic component recovers, and pushes the connecting rod mechanism connected to the elastic component to move. The connecting rod mechanism is driven and moves in a direction close to the second door leaf, so that the other end of the connecting rod mechanism is inserted into the limiting hole of the second door, so that the second door cannot be opened. When the first door is closed, the gap between the first door and the first door frame is reduced, the elastic component is compressed, and pushes the connecting rod mechanism connected to the elastic component to move in the opposite direction. The connecting rod mechanism is driven and moves in a direction away from the second door leaf, so that the other end of the connecting rod mechanism withdraws from the limiting hole of the second door, so that the second door can be opened, thereby ensuring that the first door and the second door cannot be opened at the same time, ensuring that the anti-tailgating door can play its due role under any circumstances, providing people with a safer environment.

[0054] In some embodiments, one side of the first door frame 4 is hinged to the first door 1 , and the other side is provided with an elastic component 5 near the top of the first door 1 .

[0055] In some embodiments, in order to achieve a compact design of the anti-tailgating door to reduce the occupied space, the link mechanism 3 is set to include a first link 31, a second link 32, a third link 33 and a fourth link 34;

[0056] One end of the first connecting rod 31 is arranged opposite to the first door 1, and the other end is connected to one end of the second connecting rod 32;

[0057] The other end of the second connecting rod 32 is connected to one end of the third connecting rod 33;

[0058] The other end of the third connecting rod 33 is connected to one end of the fourth connecting rod 34;

[0059] The other end of the fourth connecting rod 34 is arranged opposite to the limiting hole 21 of the second door 2 .

[0060] Among them, the design of the connecting rod mechanism can significantly improve the stability of the door leaf, reduce the shaking of the door leaf caused by external force, and enhance the overall performance of the door; the anti-tailgating door can effectively prevent the door leaf from being forced open through the linkage action of the connecting rod mechanism, thereby improving the safety performance of the door; the length and angle of the connecting rod mechanism can be adjusted according to actual needs, making the opening and closing angle and speed of the door more flexible, adapting to the needs of different usage scenarios; due to the relatively simple structure of the connecting rod mechanism, daily maintenance and troubleshooting are relatively easy, reducing maintenance costs; the connecting rod mechanism is usually made of metal material, which has good wear resistance and durability, and extends the service life of the door.

[0061] In some embodiments, one end of the elastic component 5 is connected to the other end of the first connecting rod 31 , and the other end is connected to the first door frame 4 .

[0062] In some embodiments, a first fixing bracket 6 is provided on the second connecting rod 32 , and the second connecting rod 32 and the first fixing bracket 6 are in sliding fit.

[0063] In some embodiments, a second fixing bracket 7 is provided on the third connecting rod 33 , and the third connecting rod 33 and the second fixing bracket 7 are in sliding fit.

[0064] Typically, the first fixing bracket 6 and the second fixing bracket 7 are fixed on a wall.

[0065] In some embodiments, in order to provide flexibility and adaptability of the door, a sliding guide rail 35 is installed on the second connecting rod 32 so that the first fixed bracket 6 can slide back and forth on the sliding guide rail 35;

[0066] A sliding guide rail 35 is installed on the third connecting rod 33 so that the second fixing bracket 7 can slide back and forth on the sliding guide rail 35 .

[0067] The design of the sliding guide rail can effectively absorb and disperse the impact force generated when the door leaf is opened and closed, thereby extending the service life of the door.

[0068] In some embodiments, in order to reduce friction between the connecting rod and the door frame, improve the opening and closing flexibility of the door, maintain the stability and guidance of the connecting rod, reduce noise and wear, and extend the service life of the door, a first guide sleeve 8 is mounted on the first connecting rod 31, and the first guide sleeve 8 is fixed to the first door frame 4;

[0069] The second guide sleeve 9 is sleeved on the second connecting rod 32 , and the second guide sleeve 9 is fixed on the second door frame 10 corresponding to the second door 2 .

[0070] In some embodiments, one side of the second door frame 10 is hinged to the second door 2 , and the other side is provided with a second guide sleeve 9 near the top of the second door 2 .

[0071] Exemplarily, in order to ensure the stability of the first guide sleeve, the first guide sleeve 8 is welded to the first door frame 4 .

[0072] Exemplarily, in order to ensure the stability of the second guide sleeve, the second guide sleeve 9 is welded to the second door frame 10 .

[0073] Exemplarily, the elastic component 5 is selected from a spring, one end of the spring is connected to the other end of the first connecting rod 31 , and the other end of the spring is connected to the first door frame 4 .

[0074] In some embodiments, in order to increase the safety and aesthetics of the door, the second door frame 10 is designed to have a hollow cavity structure, the part where the third connecting rod 33 and the fourth connecting rod 34 are connected is located in the hollow cavity of the second door frame 10, and a part of the second guide sleeve 9 is located in the hollow cavity of the second door frame 10.

[0075] In some embodiments, a first through hole 101 and a second through hole 102 are provided on the cavity wall of the second door frame 10 . The third connecting rod 33 is passed through the first through hole 101 , and the second guide sleeve 9 is passed through the second through hole 102 .

[0076] In some embodiments, in order to increase the safety and aesthetics of the door and reduce the overall weight of the door, the first door frame 4 is designed to have a hollow cavity structure, the elastic component 5 is arranged in the hollow cavity of the first door frame 4, and the other end of the elastic component 5 is fixedly connected to the inner wall of the cavity of the first door frame 4.

[0077] In some embodiments, a third through hole 41 and a fourth through hole 42 are provided on the cavity wall of the first door frame 4 . The second connecting rod 32 is passed through the third through hole 41 , and the first guide sleeve 8 is passed through the fourth through hole 42 .

[0078] In some embodiments, the other end of the first connecting rod 31 is hinged to one end of the second connecting rod 32 .

[0079] In some embodiments, the other end of the second link 32 is hinged to one end of the third link 33 .

[0080] In some embodiments, the other end of the third link 33 is hinged to one end of the fourth link 34 .

[0081] When the first door is closed, the gap between the first door and the first door frame is reduced, the elastic component is compressed, pushing the link mechanism connected to the elastic component to move in the opposite direction, the link mechanism is driven and moves in the direction away from the second door leaf, so that the other end of the link mechanism withdraws from the limiting hole of the second door, so that the second door can be opened, thereby ensuring that the first door and the second door cannot be opened at the same time, ensuring that the anti-tailgating door can play its due role under any circumstances, and providing people with a safer environment. The invention effectively solves the problem that the existing anti-tailgating door cannot work normally in the case of power outage or problem with the electric control system, thereby affecting the safety and effectiveness of the access control system. In the field of protective door technology, the invention has promotion and application value and practical value.

[0082] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. An anti-tailgating door, characterized in that: It comprises a first door (1), a second door (2) and a connecting rod mechanism (3); One end of the connecting rod mechanism (3) is arranged opposite to the first door (1), and the other end is arranged opposite to the limiting hole (21) of the second door (2); the connecting rod mechanism (3) is connected to the first door frame (4) corresponding to the first door (1) through an elastic component (5); When the first door (1) is opened, the elastic component (5) is restored, and the other end of the connecting rod mechanism (3) is inserted into the limiting hole (21), so that the second door (2) cannot be opened. When the first door (1) is closed, the elastic component (5) is compressed, and the other end of the connecting rod mechanism (3) is withdrawn from the limiting hole (21), so that the second door (2) can be opened, ensuring that the first door (1) and the second door (2) cannot be opened at the same time.

2. The anti-tailgating door according to claim 1, characterized in that: The connecting rod mechanism (3) comprises a first connecting rod (31), a second connecting rod (32), a third connecting rod (33) and a fourth connecting rod (34); One end of the first connecting rod (31) is arranged opposite to the first door (1), and the other end is connected to one end of the second connecting rod (32); The other end of the second connecting rod (32) is connected to one end of the third connecting rod (33); The other end of the third connecting rod (33) is connected to one end of the fourth connecting rod (34); The other end of the fourth connecting rod (34) is arranged opposite to the limiting hole (21) of the second door (2).

3. The anti-tailgating door according to claim 2, characterized in that: One end of the elastic component (5) is connected to the other end of the first connecting rod (31), and the other end is connected to the first door frame (4).

4. The anti-tailgating door according to claim 2, characterized in that: A first fixing bracket (6) is provided on the second connecting rod (32), and the second connecting rod (32) and the first fixing bracket (6) are in sliding engagement; And / or, a second fixing bracket (7) is provided on the third connecting rod (33), and the third connecting rod (33) and the second fixing bracket (7) are in sliding fit.

5. The anti-tailgating door according to claim 4, characterized in that: The second connecting rod (32) is provided with a sliding guide rail (35), so that the first fixed bracket (6) can slide back and forth on the sliding guide rail (35); And / or, a sliding guide rail (35) is installed on the third connecting rod (33), so that the second fixed bracket (7) can slide back and forth on the sliding guide rail (35).

6. The anti-tailgating door according to claim 2, characterized in that: A first guide sleeve (8) is sleeved on the first connecting rod (31), and the first guide sleeve (8) is fixed on the first door frame (4); And / or, a second guide sleeve (9) is sleeved on the second connecting rod (32), and the second guide sleeve (9) is fixed on a second door frame (10) corresponding to the second door (2).

7. The anti-tailgating door according to claim 6, characterized in that: The first guide sleeve (8) is welded to the first door frame (4); And / or, the second guide sleeve (9) is welded to the second door frame (10); And / or, the elastic component (5) is selected from a spring, one end of the spring is connected to the other end of the first connecting rod (31), and the other end is connected to the first door frame (4).

8. The anti-tailgating door according to claim 6, characterized in that: The second door frame (10) is a hollow cavity structure, the portion where the third connecting rod (33) and the fourth connecting rod (34) are connected is located in the hollow cavity of the second door frame (10), and a portion of the second guide sleeve (9) is located in the hollow cavity of the second door frame (10); And / or, a first through hole (101) and a second through hole (102) are provided on the cavity wall of the second door frame (10), the first through hole (101) is penetrated by the third connecting rod (33), and the second through hole (102) is penetrated by the second guide sleeve (9).

9. The anti-tailgating door according to claim 6, characterized in that: The first door frame (4) is a hollow cavity structure, the elastic component (5) is arranged in the hollow cavity of the first door frame (4), and the other end of the elastic component (5) is fixedly connected to the inner wall of the cavity of the first door frame (4); And / or, a third through hole (41) and a fourth through hole (42) are provided on the cavity wall of the first door frame (4), the second connecting rod (32) is passed through the third through hole (41), and the first guide sleeve (8) is passed through the fourth through hole (42).

10. The anti-tailgating door according to claim 2, characterized in that: The other end of the first connecting rod (31) is hinged to one end of the second connecting rod (32); And / or, the other end of the second connecting rod (32) is hinged to one end of the third connecting rod (33); And / or, the other end of the third connecting rod (33) is hinged to one end of the fourth connecting rod (34).

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