Automatic anti-flood civil defense door

Abstract

This invention discloses an automatic flood-proof civil defense door, comprising a concrete structure, a door frame, a door, a track groove, and a threaded guide rod. An entrance / exit passage is arranged on the concrete structure. The door frame surrounds the entrance / exit passage. The track groove is installed on the lower side of the door frame and connected to the lower end of the door, serving as the door's moving track. The threaded guide rod is installed on the upper side of the door frame and connected to the upper end of the door. A steel ring is provided at the upper end of the door, and the steel ring is fitted onto the threaded guide rod. The steel ring has internal threads. By rotating the threaded guide rod in both directions, the steel ring moves left and right, thereby moving the door left and right along the threaded guide rod and the track groove to open or close the entrance / exit passage. This invention, through the cooperation of the threaded guide rod and the steel ring, achieves automatic opening and closing of the civil defense door, possessing excellent flood-proof capabilities and improving safety and reliability.

Description

Technical Field

[0001] This invention relates to the fields of construction, civil defense, and drainage, and can be applied to shield tunneling stations, conventional underground stations, underground spaces, civil buildings, industrial buildings, etc. Specifically, it refers to an automatic flood-proof civil defense door. Background Technology

[0002] In recent years, with global climate change and frequent extreme weather events, floods have occurred frequently in many areas. Traditional ground-level flood barriers at entrances and exits often fail to perform their intended waterproofing function under these circumstances, leading to flooding of underground structures (especially underground stations) and causing significant damage to people and public property. To address this situation, most underground building designs in China now require civil defense features, and many cities are also requiring research into automatic civil defense doors with flood control functions. However, installing separate internal flood barriers requires more installation and working space, and conventional designs often fail to provide sufficient slack to meet this requirement.

[0003] Existing traditional air-raid shelter doors offer some flood protection due to their sealing properties, but they suffer from several fatal drawbacks: First, traditional air-raid shelter doors typically require manual opening and closing, making them difficult to close promptly during flooding and failing to quickly stop floodwater intrusion; achieving timely, coordinated opening requires additional complex electric devices. Second, traditional air-raid shelter doors mostly employ a swing design, which, due to their weight and the lever principle, makes efficient electric and automatic control difficult. Finally, due to the swing door design, water flow resistance during flooding makes it almost impossible for the doors to close effectively. Therefore, existing technology cannot simultaneously meet the needs of both civil defense and flood protection, necessitating a new type of air-raid shelter door that can automatically prevent flooding and is easy to operate. Summary of the Invention

[0004] In view of the shortcomings of existing technologies, this invention proposes an automatic flood-proof door, which not only has excellent flood protection capabilities, but also can automatically open and close, simplifying operation and improving safety and reliability.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: An automatic flood-proof civil defense door includes a concrete structure, a civil defense door frame, a civil defense door, a track groove, and a threaded guide rod. An entrance / exit passage is arranged on the concrete structure. The civil defense door frame surrounds the entrance / exit passage. The track groove is installed on the lower side of the civil defense door frame and connected to the lower end of the civil defense door, serving as a moving track for the civil defense door. The threaded guide rod is installed on the upper side of the civil defense door frame and connected to the upper end of the civil defense door. A steel ring is provided at the upper end of the civil defense door, and the steel ring is sleeved on the threaded guide rod. The steel ring has an internal thread. By rotating the threaded guide rod in both directions, the steel ring moves left and right, thereby causing the civil defense door to move left and right along the threaded guide rod and the track groove to open or close the entrance / exit passage. A resilient pin is provided on the civil defense door, and a socket is provided on the civil defense door frame to cooperate with the resilient pin. When the civil defense door closes the entrance / exit passage, the resilient pin is inserted into the socket to lock the position of the civil defense door.

[0006] Preferably, the air-raid shelter door is folding, covering the entrance / exit passage when closed, and folding to the right side of the entrance / exit passage when open. It includes alternating main doors and sub-doors. The steel ring is set on the top of the leftmost main door, and the top of the other main doors is provided with guide rings sleeved on the threaded guide rod. The inner surface of the guide rings is smooth.

[0007] Preferably, a movable shaft is provided inside the left side of the main door, the movable shaft passes through the door body of the main door, its upper end is connected to the steel ring or guide ring, and its lower end is inserted into the track groove.

[0008] Preferably, the air-raid shelter door is an integral type, covering the entrance and exit passage in the closed state and located on one side of the entrance and exit passage in the open state. A sliding guide rod is provided on one side of the entrance and exit passage, and the sliding guide rod is perpendicular to the threaded guide rod. A steel ring is provided at one end of the air-raid shelter door, and a guide ring is provided at the other end. The guide ring is sleeved on the sliding guide rod.

[0009] Preferably, a movable shaft is provided inside the left side of the air defense door. The movable shaft passes through the door body of the air defense door, with its upper end connected to the steel ring and its lower end inserted into the track groove.

[0010] Preferably, the air-raid shelter door has two panels, with one panel located on the left side of the entrance / exit passage and the other panel located on the right side of the entrance / exit passage when open.

[0011] Preferably, it also includes an operating guide rod and a linkage guide rod. The operating guide rod is located on the back of the air-raid shelter door frame and is controlled to rotate by a motor or a manual crank. A bevel gear is provided at the top of the operating guide rod, which cooperates with a bevel gear at one end of the linkage guide rod. After the linkage guide rod passes through the concrete wall, it drives the threaded guide rod to rotate through a gear mechanism. The motor is controlled by the control room through the FAS / BAS system. A detection point is provided at an appropriate water level at the flood control baffle of the entrance and exit passage. When the water level reaches a predetermined height, the motor is triggered to start.

[0012] Preferably, the bottom of the air-raid shelter door is inlaid with small, freely rotatable steel spheres to ensure that the air-raid shelter door can move in any direction, or it is equipped with wheels with corners, which are secondary load-bearing components of the air-raid shelter door.

[0013] Preferably, the air-raid shelter door is provided with a latch groove, and the elastic latch is located in the latch groove, including a spring and a latch. An electromagnet is provided inside the socket of the air-raid shelter door frame. When the entrance and exit passage is closed, the electromagnet is energized and generates a magnetic attraction force, attracting the elastic latch to insert into the socket.

[0014] Preferably, the socket is equipped with an intelligent sensor to sense the contact pressure between the elastic pin and the electromagnet, and after confirming that the air defense door is accurately positioned with respect to the air defense door frame, it controls the motor to close and transmits the positioning information to the remote control terminal via wireless communication.

[0015] The beneficial effects of this invention are as follows:

[0016] (1) The design structure of this invention is simple, including key components such as a concrete structure, a civil defense door frame, a track groove, and a threaded guide rod. Through reasonable layout and installation, the civil defense door can move smoothly and steadily, reducing the complexity of the mechanical transmission structure. When the door is closed, a horizontal force is applied, avoiding the problem of the door being unable to close due to flooding. This invention provides two types of civil defense door designs: folding and integral, suitable for different application scenarios. The folding design can be folded away when not in use, occupying little space, while the integral design can provide a larger area of ​​protection when closed, flexibly meeting the flood prevention needs of various underground buildings.

[0017] (2) This invention achieves automatic opening and closing of the air-raid shelter door by setting a threaded guide rod and a steel ring. Furthermore, through the linkage control of the motor and the FAS / BAS system, it can automatically start when an appropriate water level is detected, effectively preventing floods from invading underground buildings and ensuring timely response to flood situations. In addition to automatic control through the motor, it is also equipped with a manual crank to ensure that manual operation can still be performed in the event of motor failure or power outage, thereby achieving emergency closure and increasing the safety and reliability of the system.

[0018] (3) The present invention is equipped with an elastic pin and a socket on the door body. The door is firmly locked by inserting the pin into the socket, which ensures a high degree of airtightness in the closed state, effectively preventing water infiltration and further enhancing the flood prevention capability. An intelligent sensor is installed in the socket, which can monitor the contact pressure between the elastic pin and the electromagnet in real time, ensuring the accurate positioning of the door and the door frame, and transmitting the positioning information to the remote control terminal through wireless communication, which facilitates remote monitoring and management and improves the intelligence level of the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the folded state of a civil defense door according to an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the unfolding process of a civil defense door according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a fully deployed air-raid shelter door according to an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 A magnified view of part A;

[0023] Figure 5 This is a schematic diagram of the back of a civil defense door according to an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the open state of a civil defense door according to another embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the closing process of a civil defense door according to another embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the closed state of a civil defense door according to another embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the bottom structure of the air-raid shelter door according to an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the structure of the elastic pin and pin groove according to an embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the engagement between the elastic pin and the pin slot in an embodiment of the present invention.

[0030] Reference numerals: 1-Concrete structure; 2-Air raid shelter door frame; 3-Air raid shelter door; 31-Main door; 32-Daughter door; 4-Slide rail; 5-Threaded guide rod; 6-Entrance / exit passage; 7-Steel ring; 8-Elastic pin; 9-Socket; 10-Guide ring; 11-Sliding guide rod; 12-Operating guide rod; 13-Linkage guide rod; 14-Motor; 15-Manual crank; 16-Small steel ball; 17-Wheel; 18-Pin slot; 19-Electromagnet; 20-Intelligent sensor. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the present invention.

[0032] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0033] Please see Figure 1-11 This embodiment provides an automatic flood-proof civil defense door, including a concrete structure 1, a civil defense door frame 2, a civil defense door 3, a track groove 4, and a threaded guide rod 5. An entrance / exit passage 6 is arranged on the concrete structure 1, and the civil defense door frame 2 is arranged around the entrance / exit passage 6 to ensure that the civil defense door 3 can effectively close the entrance / exit passage 6 during floods. The track groove 4 is installed on the lower side of the civil defense door frame 2 and connected to the lower end of the civil defense door 3, serving as the moving track for the civil defense door 3. Through the track groove 4, the civil defense door 3 can move smoothly in the horizontal direction. When the civil defense door 3 closes, a horizontal force is applied, avoiding the problem of the door failing to close due to flooding.

[0034] The threaded guide rod 5 is installed on the upper side of the air-raid shelter door frame 2 and connected to the upper end of the air-raid shelter door 3 to ensure that the air-raid shelter door 3 remains stable when moving. A steel ring 7 is provided at the upper end of the air-raid shelter door 3. The steel ring 7 is fitted on the threaded guide rod 5 and has an internal thread. By rotating the threaded guide rod 5 in both directions, the steel ring 7 is driven to move left and right, thereby driving the air-raid shelter door 3 to move left and right along the threaded guide rod 5 and the track slide 4 to open or close the entrance and exit passage 6. This design enables the air-raid shelter door 3 to respond quickly and smoothly to flood conditions and close the entrance and exit passage 6 in a timely manner.

[0035] The air-raid shelter door 3 is equipped with a resilient latch 8, and the air-raid shelter door frame 2 is equipped with a socket 9 that mates with the resilient latch 8. Multiple resilient latches 8 and sockets 9 can be installed, such as at the four corners of the air-raid shelter door frame 2. When the air-raid shelter door 3 closes the entrance / exit passage 6, multiple resilient latches 8 are inserted into the corresponding sockets 9 to lock the position of the air-raid shelter door 3, preventing it from moving left or right after closing. This design not only ensures the precise positioning of the air-raid shelter door but also maintains the stability of the door body under flood pressure, thus guaranteeing the reliability of the flood prevention function. This structural design enables the automatic flood-proof air-raid shelter door to maintain efficient protective functions under various harsh conditions, providing a reliable flood barrier for underground structures.

[0036] Please see Figure 1-5 In some embodiments, the air-raid shelter door 3 is foldable, covering the entrance / exit passage 6 when closed, and folding to the right side of the entrance / exit passage 6 when open. It includes alternating main doors 31 and secondary doors 32. The main door 31 is the primary load-bearing door. The secondary doors 32 and main doors 31 are connected by a folding design. The door bodies of the secondary doors 32 and main doors 31 are designed with approximately 1m sections of internal steel plates with interlocking seams and sealing rubber to ensure waterproof sealing. A steel ring 7 is positioned at the top of the leftmost main door 31 to ensure smooth movement of the main door 31 under the action of the threaded guide rod 5. Other main doors 31 have guide rings 10 fitted onto the threaded guide rod 5 at their tops. The inner surface of the guide rings 10 is smooth to reduce friction and ensure smooth sliding of the main doors 31. A movable shaft is located inside the left side of the main door 31, penetrating the door body. Its upper end is connected to the steel ring 7 or guide ring 10, and its lower end is inserted into the track groove 4. This design allows the movable shaft to slide within the track groove 4, further ensuring the stability and smoothness of the main door 31. When the air-raid shelter door 3 is closed, the main door 31 and the daughter door 32 work closely together to effectively cover the entrance / exit passage 6, providing reliable flood protection. In the open state, the folded air-raid shelter door 3 is located on the right side of the entrance / exit passage 6, saving space and facilitating passage and use. This folding design not only increases the flexibility of the air-raid shelter door 3 but also reduces the civil engineering scale on the front and other sides of the air-raid shelter door in traditional designs, improving the convenience of installation and maintenance.

[0037] Please see Figure 6-8In other embodiments, the air-raid shelter door 3 is an integral unit, covering the entrance / exit passage 6 when closed and located on one side of the entrance / exit passage 6 when open. A sliding guide rod 11 is provided on one side of the entrance / exit passage 6, perpendicular to the threaded guide rod 5, allowing the air-raid shelter door 3 to move smoothly along a predetermined trajectory when opening and closing. A steel ring 7 is provided at one end of the air-raid shelter door 3, and a guide ring 10 is provided at the other end. The guide ring 10 is fitted onto the sliding guide rod 11, ensuring that the air-raid shelter door 3 remains stable and smooth during sliding. A movable shaft is provided inside the left side of the air-raid shelter door 3, penetrating the door body. Its upper end is connected to the steel ring 7, and its lower end is inserted into the track groove 4. Through this design, the movable shaft slides in the track groove 4, further ensuring the stability and smoothness of the air-raid shelter door 3. When the air-raid shelter door 3 is closed, the integral design ensures complete coverage of the entrance / exit passage 6, providing reliable flood protection. When open, the air-raid shelter door 3 is located on one side of the entrance / exit passage 6, without occupying the space of the entrance / exit, making it convenient for passage and use. This integrated design not only improves the protective performance of the air-raid shelter door 3, but also simplifies the structure, making it easy to install and maintain.

[0038] In some embodiments of these integrated air-raid shelter doors, there are two doors (3 in total), with one door on the left side of the entrance / exit passage 6 and the other on the right side when open. To allow the two doors (3) to move along the threaded guide rod 5 via steel rings (7), the threads on the left and right sides of the threaded guide rod 5 are designed to run in opposite directions. Thus, when the threaded guide rod 5 rotates, the two steel rings (7) move in opposite directions, causing the two doors (3) to move closer to or further away from the entrance / exit passage 6. This design ensures that during floods, the two doors (3) can close quickly and smoothly from both sides, fitting tightly to completely seal the entrance / exit passage 6. Under normal circumstances, the two doors (3) are located on either side of the entrance / exit passage 6, not occupying passage space and facilitating the passage of personnel and vehicles. When closing is required, the opposite thread design of the threaded guide rod 5 allows the two doors (3) to move synchronously to the center position, providing efficient and reliable flood protection.

[0039] Strong reference Figure 5Whether it is a folding type or an integral type of air-raid shelter door 3, the embodiments include an operating guide rod 12 and a linkage guide rod 13. The operating guide rod 12 is set on the back of the air-raid shelter door frame 2 and is controlled by a motor 14 or a manual crank 15. The motor 14 and the manual crank 15 are arranged simultaneously to cope with different working conditions. The motor 14 is arranged on the upper part of the operating guide rod 12 to avoid damage from floods, and the manual crank 15 is arranged on the lower part of the operating guide rod 12 for easy operation by personnel. A bevel gear is set on the top of the operating guide rod 12, which cooperates with the bevel gear at one end of the linkage guide rod 13 to ensure that the rotation operation can be smoothly transmitted. After the linkage guide rod 13 passes through the wall of the concrete structure 1, it drives the threaded guide rod 5 to rotate through the gear mechanism, thereby realizing the movement control of the air-raid shelter door 3. The linkage guide rod 13 is divided into two layers, the outer layer is used to fix it to the concrete structure 1, and the inner layer is a guide rod that can rotate freely within the outer layer.

[0040] The electric motor 14 is controlled by the control room via FAS (Fire Alarm System) / BAS (Building Automation System) to ensure a rapid response in emergencies. The flood barrier at the entrance / exit passage 6 is equipped with a detection point for an appropriate water level, which can be monitored using a level sensor. When the water level reaches a predetermined height, the level sensor transmits a signal to the control room, triggering the start of the control motor 14. After starting, the motor 14 drives the rotation of the threaded guide rod 5, automatically closing the air-raid shelter door 3, ensuring the flood prevention function is activated promptly and effectively preventing floodwater from entering the underground structure.

[0041] Please see Figure 9 Furthermore, the bottom of the air-raid shelter door 3 is inlaid with small, freely rotating steel spheres 16. This design ensures that the air-raid shelter door 3 can move smoothly in any direction, reducing frictional resistance. In addition, corner wheels 17 can be installed as secondary load-bearing components of the air-raid shelter door 3, further improving the flexibility and stability of movement.

[0042] Please see Figure 10-11 The air-raid shelter door 3 is equipped with a latch groove 18, and a flexible latch 8 is located in the latch groove 18, including a spring and a latch, to ensure that the flexible latch 8 can flexibly extend and retract to cooperate with the socket 9 during use. An electromagnet 19 is installed inside the socket 9 of the air-raid shelter door frame 2. When the entrance passage 6 is closed, the electromagnet 19 is energized and generates a magnetic force to attract the flexible latch 8 to insert into the socket 9, thereby locking the position of the air-raid shelter door 3 and preventing it from moving under water pressure. When the entrance passage 6 is opened, the electromagnet 19 is de-energized, and the flexible latch 8 is dislodged from the socket 9 under the action of the spring, allowing the air-raid shelter door 3 to move smoothly. For the energization control of the electromagnet 19, position sensing devices can be installed at corresponding positions on the air-raid shelter door frame 2 and the air-raid shelter door 3 to detect the position of the air-raid shelter door 3. When the air-raid shelter door 3 approaches the closed position, the position sensing device will send a signal to control the electromagnet 19 to be energized.

[0043] A smart sensor 20 is also installed inside the socket 9 to sense the contact pressure between the elastic latch 8 and the electromagnet 19. The smart sensor 20 can monitor in real time whether the elastic latch 8 is accurately inserted into the socket 9, ensuring precise positioning between the air-raid shelter door 3 and the air-raid shelter door frame 2. When the smart sensor 20 confirms that the contact pressure between the elastic latch 8 and the electromagnet 19 reaches a predetermined standard, it will send a signal to control the motor 14 to close, ensuring that the air-raid shelter door 3 is completely locked. In addition, the smart sensor 20 also transmits the positioning information to a remote control terminal via wireless communication, which facilitates remote monitoring and management of the status of the air-raid shelter door 3. This design not only improves the safety and reliability of the air-raid shelter door 3, but also ensures that protective operations can be carried out quickly and effectively in emergency situations.

[0044] In this embodiment, the air-raid shelter door 3 is made of steel or carbon fiber to ensure its excellent strength and durability. Steel provides extremely high compressive strength and corrosion resistance, maintaining structural stability and reliability under high water pressure and harsh environments. Carbon fiber, on the other hand, is lightweight and high-strength, reducing the overall weight of the air-raid shelter door 3, improving operational flexibility and convenience, while also possessing excellent corrosion resistance and fatigue resistance, meeting the needs of long-term use and frequent opening and closing. By selecting steel or carbon fiber materials, the air-raid shelter door 3 meets flood prevention requirements while simultaneously achieving the dual advantages of structural strength and ease of operation, further enhancing the overall performance and reliability of the system.

[0045] To ensure the waterproof capability of the air-raid shelter door, and considering that the highest water pressure is at the bottom, vertical elastic pins are designed into the track groove 4. These vertical elastic pins cooperate with the pin slots designed at the bottom of the air-raid shelter door 3. Their working principle is the same as the elastic pin system described earlier. When the intelligent sensor 20 detects a positioning signal, the vertical elastic pins extend from the track groove 4 and insert into the bottom pin slots of the air-raid shelter door 3, ensuring that the air-raid shelter door is securely locked at the bottom. This design not only further enhances the stability and waterproof capability of the air-raid shelter door 3 under high water pressure, but also transmits the water pressure force to the track groove 4, and then from the track groove 4 to the concrete structure 1, dispersing the water pressure and improving the reliability and protective effect of the entire system.

[0046] In summary, this invention provides an automatic flood-proof civil defense door with efficient waterproofing capabilities and a reliable automatic control system. The system includes a concrete structure 1, a civil defense door frame 2, a civil defense door 3, a track groove 4, and a threaded guide rod 5, enabling the automatic opening and closing of the civil defense door 3. The civil defense door 3 is designed in two forms: folding and integral. The folding civil defense door covers the entrance / exit passage 6 when closed and folds to one side of the entrance / exit passage 6 when open, including alternating main doors 31 and secondary doors 32. The integral civil defense door covers the entrance / exit passage 6 when closed and is located to one side of the entrance / exit passage 6 when open. The threaded guide rod 5 is installed on the upper side of the civil defense door frame 2 and connected to the upper end of the civil defense door 3. Through the cooperation of a steel ring 7 and a guide ring 10, it drives the civil defense door 3 to move left and right along the threaded guide rod 5 and the track groove 4 to open or close the entrance / exit passage 6. The electric motor 14 of this invention is controlled by the control room via a FAS / BAS system. A liquid level sensor monitors the water level, and when the water level reaches a predetermined height, it triggers the start of the control motor 14, driving the rotation of the threaded guide rod 5 and automatically closing the air-raid shelter door 3, ensuring timely activation of the flood prevention function. This invention not only improves the ease of operation and safety of the air-raid shelter door 3, but also enables rapid response and effective protection in emergencies, providing a reliable flood barrier. Through innovative structural design and intelligent control system, this invention addresses the shortcomings of existing technologies while providing a completely new solution for flood prevention in underground structures, with broad application prospects and significant social benefits.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automatic flood-proof air defense door, characterized in that, The system includes a concrete structure (1), a civil defense door frame (2), a civil defense door (3), a track groove (4), and a threaded guide rod (5). An entrance / exit passage (6) is arranged on the concrete structure (1). The civil defense door frame (2) is arranged around the entrance / exit passage (6). The track groove (4) is installed on the lower side of the civil defense door frame (2) and connected to the lower end of the civil defense door (3), serving as the moving track for the civil defense door (3). The threaded guide rod (5) is installed on the upper side of the civil defense door frame (2) and connected to the upper end of the civil defense door (3). A steel ring (7) is provided at the upper end of the civil defense door (3). A steel ring (7) is fitted onto the threaded guide rod (5). The steel ring (7) has an internal thread. By rotating the threaded guide rod (5) in both directions, the steel ring (7) moves left and right, thereby causing the air-raid shelter door (3) to move left and right along the threaded guide rod (5) and the track groove (4) to open or close the entrance / exit passage (6). The air-raid shelter door (3) is equipped with an elastic pin (8), and the air-raid shelter door frame (2) is equipped with a socket (9) that mates with the elastic pin (8). When the air-raid shelter door (3) closes the entrance / exit passage (6), the elastic pin (8) is inserted into the socket (9) to open or close the entrance / exit passage (6). The position of the air-raid shelter door (3) is locked; the air-raid shelter door (3) is an integral type, covering the entrance passage (6) in the closed state, and located on one side of the entrance passage (6) in the open state. A sliding guide rod (11) is provided on one side of the entrance passage (6). The sliding guide rod (11) is perpendicular to the threaded guide rod (5). A steel ring (7) is provided at one end of the air-raid shelter door (3), and a guide ring (10) is provided at the other end. The guide ring (10) is sleeved on the sliding guide rod (11); it also includes an operating guide rod (12) and a linkage guide rod (13). The operating guide rod (12) is provided with a steel ring (7) and a guide ring (10) at the other end. The door frame (2) is placed on the back side and rotated by a motor (14). The top of the operating guide rod (12) is provided with a bevel gear, which cooperates with the bevel gear at one end of the linkage guide rod (13). After the linkage guide rod (13) passes through the wall of the concrete structure (1), it drives the threaded guide rod (5) to rotate through the gear mechanism. The motor (14) is controlled by the control room through the FAS / BAS system. The appropriate water level at the flood baffle of the entrance and exit channel (6) is provided with a detection point. When the water level reaches the predetermined height, the motor (14) is triggered to start.

2. The automatic flood-proof civil defense door according to claim 1, characterized in that, The air defense door (3) has a movable shaft inside on the left side. The movable shaft passes through the door body of the air defense door (3), with the upper end connected to the steel ring (7) and the lower end inserted into the track groove (4).

3. The automatic flood-proof civil defense door according to claim 2, characterized in that, The air defense door (3) consists of two doors, one of which is located on the left side of the entrance / exit passage (6) and the other is located on the right side of the entrance / exit passage (6) when it is open.

4. The automatic flood-proof civil defense door according to claim 1, characterized in that, The bottom of the air defense door (3) is inlaid with small steel balls (16) that can rotate freely, so that the air defense door (3) can move in any direction, or is equipped with wheels (17) with corners, which are secondary load-bearing components of the air defense door (3).

5. The automatic flood-proof civil defense door according to claim 4, characterized in that, The air defense door (3) is provided with a latch groove (18), and the elastic latch (8) is located in the latch groove (18), including a spring and a latch. The socket (9) of the air defense door frame (2) is provided with an electromagnet (19). When the entrance and exit passage (6) is closed, the electromagnet (19) is energized and generates a magnetic attraction force, attracting the elastic latch (8) to insert into the socket (9).

6. The automatic flood-proof civil defense door according to claim 5, characterized in that, The socket (9) is equipped with an intelligent sensor (20) to sense the contact pressure between the elastic pin (8) and the electromagnet (19), and after confirming that the air defense door (3) is accurately positioned with the air defense door frame (2), control the motor (14) to close, and transmit the positioning information to the remote control terminal through wireless communication.

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