A civil air defense door locking structure

Abstract

The utility model discloses a kind of civil air defence door locking structure, including the bolt driving assembly for driving bolt elongation and door frame insertion to realize the closing of door leaf, bolt driving assembly includes driving mechanism, driving mechanism drives the bolt of upper and lower two sides mutually away to realize the locking of door leaf, door leaf is also provided with the middle joint locking assembly for the bottom middle joint sealing;The bolt driving assembly is set in the application, and operator is conveniently driven by driving mechanism to drive the bolt installed on door leaf, and then cooperate with the bolt seat on door frame to realize the door leaf is pressed to door frame to reach the purpose of closing, in addition, for the bottom middle joint formed after the closing of two door leaves, middle joint locking assembly is separately set to further lock, to cooperate with the bolt to ensure the closing sealing effect of door leaf, improve the protection effect of civil air defence door.

Description

Technical Field

[0001] This utility model relates to the field of civil defense door technology, specifically to a locking structure for civil defense doors. Background Technology

[0002] Civil defense doors are a type of air defense facility, typically installed in basements, air-raid shelters, underground parking lots, and other areas. They serve as facilities for emergency evacuation, wave protection, and moisture protection, and are an important component of civil defense engineering, primarily used for air raid defense and disaster relief. Civil defense doors are usually equipped with locking mechanisms, allowing them to be locked or opened by adjusting the locking mechanism to achieve their protective and operational functions.

[0003] Traditional air defense doors have locking mechanisms that are difficult for individuals to operate when closing, and may even be impossible to close. They may also not lock properly, resulting in air and water leaks because the rubber strip cannot be crushed. In particular, the bottom seam is difficult to ensure a tight seal, which greatly reduces the protective effect of the air defense door. Utility Model Content

[0004] To address the shortcomings of existing technologies, a locking structure for air-raid shelter doors is proposed, which solves the problems of difficulty in closing traditional air-raid shelter doors and the inability to guarantee a locking effect in the aforementioned background technologies.

[0005] To achieve the above objectives, the present invention proposes the following technologies: A locking structure for a civil defense door includes a pin-driven assembly for driving a pin to extend and engage with the door frame to close the door. The pin-driven assembly includes a driving mechanism that drives the pins on the upper and lower sides to move away from each other to lock the door. The door is also provided with a center seam locking assembly for sealing the bottom center seam.

[0006] Furthermore, the driving mechanism includes a scissor jack and a driving rod for driving the scissor jack. One end of the driving rod is connected to a reducer, and the other end is rotatably connected to a support seat mounted on the door leaf.

[0007] Furthermore, the support base includes a fixed base fixedly connected to the door leaf and an adapter base detachably connected to the fixed base. The adapter base has an adapter hole for inserting the end of the drive rod and limiting and supporting it.

[0008] Furthermore, the pin-driven assembly also includes adjustable connecting rods disposed at the upper and lower ends of the scissor jack. The ends of the adjustable connecting rods are connected to sliding plates for installing pins. The scissor jack drives the adjustable connecting rods to reciprocate so as to drive the pins on the sliding plates to engage with the door frame and lock the door.

[0009] Furthermore, the bottom center seam is located between the two door panels, and the center seam locking assembly includes a clamping block rotatably connected to the bottom edge of the right door panel. The distance between the clamping block and the door panel is adjustable so that after rotating to the outside of the left door panel, the distance between the clamping block and the left door panel can be adjusted to clamp the left door panel and thus press the sealing strip between the two door panels to achieve a seal.

[0010] Furthermore, the center seam locking assembly also includes a rotating shaft that is connected to the right door leaf. A rotating arm is fixed to the end of the rotating shaft, and the clamping block is disposed at the free end of the rotating arm so that the clamping block can be moved to the outside of the left door leaf by rotating the rotating arm.

[0011] Furthermore, the tightening block is located at the end of the lead screw, and a sleeve is threadedly connected to the outer periphery of the lead screw. The sleeve is fixedly installed on the rotating arm. Rotating the lead screw causes the tightening block to approach the left door leaf to press the sealing strip that is snapped between the two door leaves.

[0012] Furthermore, a turntable connected to a reducer is provided on each side of the door leaf. The reducer is located on the inner side of the door leaf and is connected to the turntable on the outer side of the door leaf through a connecting shaft. A sealing component is provided inside the connecting shaft to ensure the airtightness of the door leaf.

[0013] Furthermore, the door leaf is provided with mounting holes, and the connecting shaft includes a hollow shaft welded in the mounting holes, and a first connecting shaft that is rotatably connected inside the hollow shaft. The two ends of the first connecting shaft are respectively detachably connected to the outer turntable and the second connecting shaft, and the second connecting shaft is connected to the reducer.

[0014] Furthermore, a sealing section is provided inside the hollow shaft, and the sealing assembly includes a copper sleeve that is snapped into the assembly grooves opened at both ends of the sealing section. The first connecting shaft is rotatably connected to the copper sleeve, and a sealing ring is provided between the first connecting shaft and the copper sleeve.

[0015] Compared with the prior art, the comprehensive effects brought about by this utility model include: This application incorporates a latch-driven component, allowing the operator to extend and retract the latch installed on the door leaf via a drive mechanism. This, in turn, engages with the latch seat on the door frame to press the door leaf tightly against the frame, achieving a closed position. Furthermore, a separate center seam locking component is provided for the bottom center seam formed after the two door leaves are closed, further securing the door leaf. This, in conjunction with the latch, ensures a tight seal when the door leaf is closed, thereby enhancing the protective effect of the blast door. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 for Figure 1 A partial structural diagram at point A in the middle; Figure 3 for Figure 1 A schematic diagram of the partial structure at point B in the middle; Figure 4 for Figure 1 A schematic diagram of the partial structure at point C in the middle; Figure 5 This is a partial structural diagram of the seam locking assembly in an embodiment of the present utility model; Figure 6 This is a cross-sectional view of the seam locking assembly in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the structure of the two doors after they are closed according to an embodiment of this utility model; Figure 8 This is a cross-sectional view of the overall structure of an embodiment of the present utility model; Figure 9 for Figure 8 A schematic diagram of a local part of the structure.

[0017] Legend: 1. Pin; 2. Door frame; 3. Door leaf; 4. Center seam locking assembly; 5. Scissor jack; 6. Drive rod; 7. Reducer; 8. Support base; 9. Fixed base; 10. Adapter base; 11. Adjustable connecting rod; 12. Sliding plate; 13. Connecting pipe; 14. Connecting base; 15. Tightening block; 16. Sealing strip; 17. Rotating shaft; 18. Rotating arm; 19. Lead screw; 20. Sleeve; 21. Turntable; 22. Hollow shaft; 23. First connecting shaft; 24. Second connecting shaft; 25. Sealing section; 26. Assembly groove; 27. Copper sleeve; 28. Sealing ring; 29. ​​Guide seat; 30. Positioning plate; 31. Guide plate; 32. Relief groove; 33. Connecting bolt. Detailed Implementation

[0018] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] In this document, terms such as “up,” “down,” “left,” “right,” and “top” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figures 1 to 9As shown, a locking structure for a civil defense door includes a pin driving assembly for driving a pin 1 to extend and engage with a door frame 2 to close the door leaf 3. The pin driving assembly includes a driving mechanism that drives the pins 1 on the upper and lower sides to move away from each other to lock the door leaf 3. The door leaf 3 is also provided with a center seam locking assembly 4 for sealing the bottom center seam.

[0021] By setting up a latch drive component, the operator can easily extend and retract the latch 1 installed on the door leaf 3 through the drive mechanism, which then cooperates with the latch seat on the door frame 2 to press the door leaf 3 tightly onto the door frame 2 to achieve the purpose of closing. In addition, a separate center seam locking component 4 is set up for the bottom center seam formed after the two door leaves 3 are closed, so as to further lock it, thereby cooperating with the latch 1 to ensure the closing and sealing effect of the door leaf 3 and improve the protection effect of the blast door.

[0022] Specifically, in this embodiment, the left and right door panels are hinged to the door frame 2 by hinges. A sealing strip 16 is provided between the door panels 3 to cover the gaps generated after the blast door is closed and achieve a seal. Multiple pins 1 are provided on the upper and lower sides of the door panels 3, and multiple pin seats are provided on the corresponding door frame 2 to limit the pins 1. A center seam locking component 4 is provided to increase the compressive strength between the two door panels 3 and ensure the seal of the center seam.

[0023] Preferably, in this embodiment, the two door panels 3 are constructed using welded aluminum honeycomb panels. Welded aluminum honeycomb panels are hollow composite structural panels with a hexagonal welded aluminum honeycomb core as the core material, aluminum plates on both sides, and welded together at high temperature. Each door panel 3 is welded together from two honeycomb panels of different densities. The honeycomb panel near the center seam uses a higher density panel, while the panel further away from the center seam uses a lower density panel. The specific widths of the two types of honeycomb panels are determined as needed. The honeycomb panel further away from the center seam is supported by the door frame 2, providing good rigidity under stress. The honeycomb panel near the center seam of the door panel 3 is less supported by the door frame 2 and is a weak point for the two door panels 3; therefore, a higher density honeycomb panel is used here to increase the structural strength. Using aluminum honeycomb panels of different densities reduces the weight of the door panels 3 by approximately 40%.

[0024] In the locking structure of the air-raid shelter door in this embodiment, the driving mechanism includes a scissor jack 5 and a driving rod 6 for driving the scissor jack 5. One end of the driving rod 6 is connected to a reducer 7, and the other end is rotatably connected to a support seat 8 provided on the door leaf 3.

[0025] Using scissor jack 5 allows for effortless, efficient, and rapid activation of the latch 1, facilitating the locking of the air-raid shelter door. In the event of an emergency, the door can be closed quickly and conveniently. Furthermore, scissor jack 5 provides stronger support, making it suitable for heavier and larger air-raid shelter doors.

[0026] Specifically, the scissor jack 5 is a manual mechanical lifting device characterized by a scissor-shaped metal bracket. The frame of the scissor jack 5 consists of two sets of rectangular connecting rods connected in sequence. Slider blocks are set on the left and right sides respectively. The drive rod 6 is a two-way threaded screw with a positive thread on one side and a negative thread on the other side. It is threaded to the two sliders on both sides respectively. A positioning seat fixed on the door leaf 3 is also set between the two sliders. The drive rod 6 passes through the positioning seat and is rotatably connected to it. The positioning seat provides support for the drive rod 6 and cooperates with the support seat 8 at the end of the drive rod 6 to improve the telescopic stability of the scissor jack 5. This provides strong support for the pin 1, smoothly drives the pin 1 to move and positions the pin 1, ensuring safety and reliability and preventing the pin 1 from falling off the pin seat.

[0027] In the locking structure of the air defense door in this embodiment, the support base 8 includes a fixed base 9 fixedly connected to the door leaf 3 and an adapter base 10 detachably connected to the fixed base 9. The adapter base 10 has an adapter hole for inserting the end of the drive rod 6 and limiting and supporting it.

[0028] Specifically, one end of the drive rod 6 is connected to the output end of the reducer 7 via a coupling, and the other end is transferred to the support base 8. The fixed base 9 adopts a single-sided bending form, with one side welded to the door leaf 3. The adapter 10 is fixed to the fixed base 9 by bolts, which facilitates the adjustment of the position of the adapter 10 and the removal of the bolts.

[0029] During operation, the scissor jack 5 experiences varying forces at its upper and lower positions due to differences in the gaps between the upper and lower pins 1. When this force is transmitted to the drive rod 6, the unsupported outer side of the drive rod 6 is prone to bending. This bending causes a change in the thread pitch, leading to locking and making rotation difficult, thus rendering the entire drive mechanism inoperable. The support base 8, as described above, limits and supports the end of the drive rod 6, preventing deformation and ensuring smooth operation of the drive mechanism.

[0030] Compared to traditional locking mechanisms for air-raid shelter doors, the locking mechanism in this application includes a scissor jack 5 and a support base 8. Locking can be achieved quickly and efficiently simply by rotating the turntable 21 to drive the reducer 7. This avoids the problem in traditional locking mechanisms where the large friction between the pin 1 and the pin seat makes it difficult for a single person to close the door, requiring multiple people to rotate the turntable 21. The locking mechanism in this application allows for easy and effortless rotation, achieving rapid and efficient protection. The support base 8 supports the drive rod 6 of the scissor jack 5, reducing stress and deformation of the drive rod 6 and preventing changes in the thread pitch at the bending position of the drive rod 6, which could lead to locking.

[0031] Preferably, an annular copper sleeve is provided on the side of the adapter 10 near the scissor jack 5, and the copper sleeve is fitted around the drive rod 6, thereby reducing the wear of the drive rod 6 on the adapter 10.

[0032] In the locking structure of the air-raid shelter door in this embodiment, the pin driving assembly also includes adjustable connecting rods 11 disposed at the upper and lower ends of the scissor jack 5. The end of the adjustable connecting rod 11 is connected to a sliding plate 12 for installing the pin 1. The scissor jack 5 drives the adjustable connecting rod 11 to reciprocate so as to drive the pin 1 on the sliding plate 12 to be inserted into the door frame 2 to lock the door leaf 3.

[0033] Preferably, in this embodiment, the reducer 7 is installed in the middle of the door leaf 3, and two scissor jacks 5 are symmetrically arranged on each door leaf 3 about the reducer 7. The output ends on both sides of the reducer 7 are connected to drive rods 6 through couplings. Therefore, each sliding plate 12 is driven to slide up and down through two adjustable connecting rods 11 connected to the scissor jacks 5, thereby improving the movement stability of the pin 1.

[0034] Specifically, the adjustable connecting rod 11 includes a connecting tube 13. The two ends of the connecting tube 13 are connected to the scissor jack 5 and the sliding plate 12 respectively through the connecting seat 14. The connecting seat 14 and the connecting tube 13 are threaded together to facilitate adjustment of the overall length of the adjustable connecting rod 11. Locking nuts for locking the connecting seat 14 and the connecting tube 13 are respectively provided on the upper and lower sides of the connecting tube 13.

[0035] The function of the adjustable connecting rod 11 is to adjust the length of the adjustable connecting rod 11 as needed during the assembly of the air defense door if the extension stroke of the scissor jack 5 cannot meet the insertion stroke requirements of the pin 1, thereby ensuring that the insertion stroke of the pin 1 is met.

[0036] Specifically, the connecting seat 14 connected to the sliding plate 12 is a machined integral part. One end is a threaded post for threaded connection with the connecting pipe 13, and the other end is machined into a U-shape so that it can be directly connected to the sliding plate 12 using a pin. The connecting seat 14 connected to the scissor jack 5 is a machined part welded together. One end is a threaded post for threaded connection with the connecting pipe 13, and the other end uses a welded pin, which is hinged to the frame of the scissor jack 5 through the pin.

[0037] In this embodiment, a thin nut is used as the locking nut, which is threaded onto the threaded post of the connecting seat 14. When the adjustment is complete and the stroke meets the requirements, the thin nut in the upper and lower positions is tightened to lock the position between the connecting seat 14 and the connecting tube 13, making the adjustable connecting rod 11 an integral structure. When the turntable 21 is rotated, it avoids any gaps in the fit, preventing the connecting tube 13 from spinning freely and affecting efficiency. At the same time, locking increases the stability of the entire structure. Preferably, two circular through holes are provided on the connecting tube 13, allowing the connecting tube 13 to be quickly rotated with a tool to adjust the length during use.

[0038] In the locking structure of the air-raid shelter door in this embodiment, the bottom center seam is located between the two door leaves 3. The center seam locking assembly 4 includes a top-tightening block 15 rotatably connected to the bottom edge of the right door leaf. The distance between the top-tightening block 15 and the door leaf 3 is adjustable so that after rotating to the outside of the left door leaf, the distance between the top-tightening block 15 and the left door leaf can be adjusted to tighten the left door leaf and thus press the sealing strip 16 between the two door leaves 3 to achieve a seal.

[0039] Specifically, such as Figure 7 As shown, in this embodiment, the right door leaf 3 is closed first, and then the left door leaf 3 is closed. The two door leaves 3 are closed by snap-fitting and are fitted with sealing strips 16. The door gap is sealed by squeezing the sealing strips 16 when the door leaves 3 are closed.

[0040] Preferably, sealing strips 16 are also provided between the upper and lower edges of the door leaf 3, the side away from the center seam, and the door frame 2 to ensure the overall sealing effect of the door leaf 3 and the door frame 2.

[0041] The bottom center of the air-raid shelter door is usually the most difficult to close tightly and the most prone to problems under stress. By setting up a top clamping block 15, when in use, the top clamping block 15 is rotated to the outside of the left door leaf 3, and then the distance between the top clamping block 15 and the door leaf 3 is adjusted until it abuts against the door leaf 3, thereby pressing the left door leaf 3 tightly, increasing the tightness of the connection between it and the right door leaf 3, ensuring the compression of the sealing strip 16, improving the sealing effect, and achieving the purpose of closing tightly.

[0042] In the locking structure of the air defense door in this embodiment, the center seam locking assembly 4 also includes a rotating shaft 17 that is connected to the right door leaf. The end of the rotating shaft 17 is fixed with a rotating arm 18, and the top clamping block 15 is arranged at the free end of the rotating arm 18 so that the top clamping block 15 can be moved to the outside of the left door leaf by rotating the rotating arm 18.

[0043] With the above settings, the rotating arm 18 is rotated. At this time, the rotating arm 18 rotates from the right door leaf to the left door leaf with the rotating shaft 17 as the center, so as to facilitate the adjustment of the position of the clamping block 15, so as to further realize the clamping block 15 on the door leaf 3.

[0044] In the locking structure of the air-raid shelter door in this embodiment, the top clamping block 15 is set at the end of the lead screw 19, and the outer periphery of the lead screw 19 is threaded with a sleeve 20. The sleeve 20 is fixedly installed on the rotating arm 18. Rotating the lead screw 19 drives the top clamping block 15 to approach the left door leaf to achieve the pressing of the sealing strip 16 that is snapped between the two door leaves 3.

[0045] Specifically, a handle is fixedly provided at the end of the lead screw 19 away from the tightening block 15. The handle is shaped like a plum blossom. Rotating the handle causes the lead screw 19 to rotate, thereby cooperating with the sleeve 20 to extend or retract the lead screw 19, so as to cause the tightening block 15 at the end of the lead screw 19 to squeeze the two door leaves 3 tightly, which facilitates increasing the degree of compression on the sealing strip 16 between the door leaves 3 and can effectively solve the sealing problem of the middle seam.

[0046] In the locking structure of the air-raid shelter door in this embodiment, turntables 21 connected to reducers 7 are respectively provided on both sides of the door leaf 3. The reducer 7 is located on the inner side of the door leaf 3 and is connected to the turntables 21 on the outer side of the door leaf 3 through a connecting shaft. A sealing component is provided in the connecting shaft to ensure the sealing of the door leaf 3.

[0047] In order to allow the door leaf 3 to be opened from both the inside and outside, turntables 21 connected to reducers 7 are set on both sides respectively. A connecting shaft is set to enable the other turntable 21 to input power to the reducer 7. In addition, a sealing component is set to seal the installation holes on the door leaf 3 due to the installation of the connecting shaft, so as to prevent toxic gas or liquids from passing through the door leaf 3 through this position, thus ensuring the isolation and protection effect of the air-raid shelter door.

[0048] In the locking structure of the air-raid shelter door in this embodiment, the door leaf 3 is provided with an installation hole, and the connecting shaft includes a hollow shaft 22 welded in the installation hole and a first connecting shaft 23 that is rotatably connected inside the hollow shaft 22. The two ends of the first connecting shaft 23 are respectively detachably connected to the outer turntable 21 and the second connecting shaft 24, and the second connecting shaft 24 is connected to the reducer 7.

[0049] The hollow shaft 22 is welded to the door leaf 3 to improve the sealing effect between the connecting shaft and the door leaf 3. In addition, a sealing component seals the inner wall between the first connecting shaft 23 and the hollow shaft 22, thereby further ensuring the sealing performance at the connecting shaft. The first connecting shaft 23 and the second connecting shaft 24 are designed as separate structures, which facilitates the assembly of the connecting shaft and makes it easy to replace the sealing component later, thus reducing the assembly difficulty while ensuring the sealing effect.

[0050] In the locking structure of the air defense door in this embodiment, a sealing section 25 is provided inside the hollow shaft 22, and the sealing assembly includes a copper sleeve 27 that is snapped into the assembly groove 26 opened at both ends of the sealing section 25. The first connecting shaft 23 is rotatably connected to the copper sleeve 27, and a sealing ring 28 is provided between the first connecting shaft 23 and the copper sleeve 27.

[0051] Specifically, due to the setting of the sealing section 25, mounting holes with different diameters are formed inside the hollow shaft 22. Assembly grooves 26 are respectively opened at both ends of the mounting hole with the smaller diameter on the side where the first connecting shaft 23 is installed for installing the copper sleeve 27. The copper sleeve 27 and the assembly groove 26 are interference fit, thereby ensuring the seal between the copper sleeve 27 and the hollow shaft 22. Furthermore, a sealing ring 28 is set to achieve a sealed connection between the first connecting shaft 23 and the copper sleeve 27.

[0052] With the above setup, when installing the connecting shaft, first weld the hollow shaft 22 onto the door leaf 3, and place copper sleeves 27 on both sides of the assembly groove 26, with an interference fit between the two; then put two sealing rings 28 onto the first connecting shaft 23, place them inside the copper sleeves 27, and connect the ends to another turntable 21. Then connect the second connecting shaft 24 to the first connecting shaft 23, and connect the other side of the second connecting shaft 24 to the reducer 7. During rotation, the sealing rings 28 contact the copper sleeves 27 to achieve a seal.

[0053] Preferably, the longitudinal section of the first connecting shaft 23 is T-shaped, the diameter of its large end matches the large diameter side of the hollow shaft 22, and a cross groove is opened at its end. The corresponding end of the second connecting shaft 24 is provided with a cross protrusion. The first connecting shaft 23 drives the rotation of the second connecting shaft 24 by rising to fit.

[0054] In the locking structure of the air-raid shelter door in this embodiment, guide seats 29 are provided on the upper and lower edges of the door leaf 3 corresponding to the pin 1. The guide seat 29 includes a positioning plate 30 welded to the door leaf 3 and a guide plate 31 detachably connected to the positioning plate 30. The guide plate 31 is provided with a guide sleeve for guiding the pin 1. The left and right sides of the positioning plate 30 are respectively provided with relief grooves 32, and the shape of the relief grooves 32 matches the cross-sectional shape of the connecting bolts 33, which facilitates the connection of the connecting bolts 33. The guide plate 31 and the positioning plate 30 are fixed from the outside using connecting nuts. The setting of the relief grooves 32 realizes the exposed design of the connecting bolts 33 on the door leaf 3. When the original connecting bolts 33 need to be replaced, they can be directly removed from the side guide seat 29 for easy replacement.

[0055] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "rotation", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Although embodiments of the present invention have been shown and described in detail, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A locking structure for a civil defense door, characterized in that, The device includes a pin-driven assembly for extending a pin to engage with a door frame to close the door. The pin-driven assembly includes a drive mechanism that drives the pins on the upper and lower sides to move away from each other to lock the door. The door is also provided with a center seam locking assembly for sealing the bottom center seam.

2. The locking structure for a civil defense door according to claim 1, characterized in that, The driving mechanism includes a scissor jack and a driving rod for driving the scissor jack. One end of the driving rod is connected to a reducer, and the other end is rotatably connected to a support seat mounted on the door leaf.

3. The locking structure for a civil defense door according to claim 2, characterized in that, The support base includes a fixed base that is fixedly connected to the door leaf and an adapter base that is detachably connected to the fixed base. The adapter base has an adapter hole for inserting the end of the drive rod and limiting and supporting it.

4. The locking structure for a civil defense door according to claim 2, characterized in that, The pin-driven assembly also includes adjustable connecting rods at the upper and lower ends of the scissor jack. The ends of the adjustable connecting rods are connected to sliding plates for installing pins. The scissor jack drives the adjustable connecting rods to reciprocate so that the pins on the sliding plates can be inserted into the door frame to lock the door.

5. The locking structure for a civil defense door according to claim 1, characterized in that, The bottom center seam is located between the two door panels. The center seam locking assembly includes a clamping block rotatably connected to the bottom edge of the right door panel. The distance between the clamping block and the door panel is adjustable so that after rotating to the outside of the left door panel, the distance between the clamping block and the left door panel can be adjusted to clamp the left door panel and thus press the sealing strip between the two door panels to achieve a seal.

6. The locking structure for a civil defense door according to claim 5, characterized in that, The center seam locking assembly also includes a rotating shaft that is connected to the right door leaf. A rotating arm is fixed to the end of the rotating shaft, and the clamping block is disposed at the free end of the rotating arm so that the clamping block can be moved to the outside of the left door leaf by rotating the rotating arm.

7. The locking structure for a civil defense door according to claim 6, characterized in that, The tightening block is located at the end of the lead screw, and a sleeve is threadedly connected to the outer periphery of the lead screw. The sleeve is fixedly installed on the rotating arm. Rotating the lead screw causes the tightening block to approach the left door leaf to press the sealing strip that is snapped between the two door leaves.

8. The locking structure for a civil defense door according to claim 2, characterized in that, The door leaf is provided with turntables on both sides connected to the reducer. The reducer is located on the inside of the door leaf and is connected to the turntable on the outside of the door leaf through a connecting shaft. A sealing component is provided in the connecting shaft to ensure the airtightness of the door leaf.

9. A locking structure for a civil defense door according to claim 8, characterized in that, The door leaf has a mounting hole. The connecting shaft includes a hollow shaft welded into the mounting hole and a first connecting shaft that is rotatably connected inside the hollow shaft. The two ends of the first connecting shaft are detachably connected to the outer turntable and the second connecting shaft, respectively. The second connecting shaft is connected to the reducer.

10. A locking structure for a civil defense door according to claim 9, characterized in that, The hollow shaft is provided with a sealing section, and the sealing assembly includes a copper sleeve that is snapped into the assembly grooves opened at both ends of the sealing section. The first connecting shaft is rotatably connected to the copper sleeve, and a sealing ring is provided between the first connecting shaft and the copper sleeve.

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