A civil air defense door locking linkage mechanism

Abstract

This utility model discloses a locking linkage mechanism for a civil defense door in the field of security inspection technology. It includes a left civil defense door panel, a right civil defense door panel, and a housing. A fixed frame is installed on the upper wall of the left civil defense door panel, and the housing is rotatably mounted on the inner side of the fixed frame. A base is installed on the lower wall of the left civil defense door panel, and the right civil defense door panel is slidably mounted on the upper wall of the base. The housing can be mounted above the right civil defense door panel. A sliding groove is provided on the upper wall of the base. A right slider is installed on the lower wall of the right civil defense door panel, and the slider is slidably mounted in the sliding groove. A mounting slot is provided on the upper wall of the right civil defense door panel, and the housing can be inserted into the mounting slot. A locking mechanism is installed on the upper wall of the base, located outside the sliding groove. A clearance groove is provided on the side wall of the right civil defense door panel. In this device, the right civil defense door panel can move towards the left civil defense door panel, thereby shortening the width of the device and preventing it from obstructing equipment during transport into the mine, thus avoiding affecting the transport of equipment.

Description

Technical Field

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

[0002] In the field of civil defense engineering, civil defense doors are key facilities for ensuring the safety of personnel and the stability of engineering structures. The reliability, sealing, and ease of operation of their locking mechanisms have always been core concerns of the industry. With the continuous improvement of civil defense engineering construction standards, existing traditional civil defense door locking mechanisms have gradually revealed many technical defects and are no longer able to meet the needs of modern civil defense engineering. Traditional air-raid shelter doors often employ a single-panel structure or a simple, assembled panel structure. During locking, the fit between the door panel and the base is often imprecise, leading to insufficient sealing due to excessive installation gaps. In emergencies such as nuclear blast shockwaves or toxic gas infiltration, external hazardous media can easily enter the air-raid shelter through these gaps, seriously threatening the lives of those inside. Furthermore, traditional locking mechanisms typically use manual pin or bolt locking structures, which are cumbersome and require multiple people to complete the locking action. In emergency evacuation or enclosed scenarios, this makes it difficult to quickly lock the door, delaying valuable emergency response time. Utility Model Content

[0003] The purpose of this utility model is to provide a locking linkage mechanism for air defense doors to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a locking linkage mechanism for a civil defense door, comprising a left civil defense door panel, a right civil defense door panel, and a housing. A fixing frame is installed on the upper wall of the left civil defense door panel, and the housing is rotatably installed on the inner side of the fixing frame. A base is installed on the lower wall of the left civil defense door panel, and the right civil defense door panel is slidably installed on the upper wall of the base. The housing can be mounted above the right civil defense door panel. The upper wall of the base is provided with a sliding groove, and the lower wall of the right air defense door panel is equipped with a right slider. The slider is slidably installed in the sliding groove. The upper wall of the right air defense door panel is provided with a mounting groove, and the chassis can be inserted and installed in the mounting groove. A locking mechanism is installed on the upper wall of the base. The locking mechanism is located on the outside of the slide groove. A clearance groove is provided on the side wall of the right air defense door panel. The locking mechanism can pass through the side wall of the right air defense door panel through the clearance groove.

[0005] As a preferred embodiment of the present invention, the locking mechanism includes a baffle plate, a spherical groove and a ball bearing. The baffle plate is installed on the upper wall of the base. The cross-section of the baffle plate is L-shaped. A spherical groove is provided on the upper wall of the baffle plate. A ball bearing is installed in the spherical groove. The ball bearing can fit against the inner wall of the clearance groove.

[0006] As a preferred embodiment of this utility model, the side walls of both the left and right air defense door panels are equipped with supporting angle irons, and the lower wall of the supporting angle irons is fitted with the upper wall of the base.

[0007] As a preferred embodiment of this utility model, a rubber pad is fitted to the upper wall of the mounting groove, and the rubber pad can fit against the lower wall of the chassis.

[0008] As a preferred embodiment of this utility model, a support frame is rotatably mounted on the side wall of the right air defense door panel, and a positioning groove is provided on the side wall of the fixed frame. The end of the support frame away from the right air defense door panel can be inserted into the positioning groove, and the upper wall of the support frame can be fitted against the lower wall of the chassis.

[0009] As a preferred embodiment of this utility model, the support frame includes a frame body, a sliding hole, and a pin. The frame body is rotatably mounted on the side wall of the right-side air defense door panel. The side wall of the frame body has a sliding hole, and a pin is slidably mounted in the sliding hole. The pin can be inserted into the positioning groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This device achieves precise sliding of the right air-raid shelter door panel along the groove by creating a groove on the upper wall of the base and installing a slider adapted to the groove on the lower wall of the right air-raid shelter door panel, significantly reducing the installation gap between the door panel and the base. Simultaneously, the locking mechanism penetrates the door panel through a clearance groove on the side wall of the right air-raid shelter door panel, ensuring a tight fit between the locking components and the door panel. This further eliminates gaps between the door panel, the base, and the locking components, effectively blocking the penetration of dangerous media such as nuclear blast shock waves and toxic gases, significantly improving the sealing and protective performance of the air-raid shelter door. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this patent; Figure 2 This is a front sectional view of the patent. Figure 3 This is a schematic diagram of the locking mechanism structure of this patent.

[0012] In the diagram: 1 Left air-raid shelter door panel, 2 Right air-raid shelter door panel, 3 Chassis, 4 Fixing frame, 5 Base, 6 Sliding groove, 7 Sliding block, 8 Erection slot, 9 Locking mechanism, 10 Clearance slot, 11 Support angle iron, 12 Rubber pad, 13 Support frame, 14 Positioning slot, 91 Cover plate, 92 Spherical groove, 93 Ball bearing, 131 Frame body, 132 Sliding hole, 133 Pin. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-3 This utility model provides a technical solution: In this technical solution, a locking linkage mechanism for a civil defense door includes a left civil defense door panel 1, a right civil defense door panel 2, and a housing 3. A fixing frame 4 is installed on the upper wall of the left civil defense door panel 1, and the housing 3 is rotatably installed on the inner side of the fixing frame 4. A base 5 is installed on the lower wall of the left civil defense door panel 1, and the right civil defense door panel 2 is slidably installed on the upper wall of the base 5. The housing 3 can be mounted above the right civil defense door panel 2. A sliding groove 6 is opened on the upper wall of the base 5, and a slider 7 is installed on the lower wall of the right civil defense door panel 2. The slider 7 is slidably installed in the sliding groove 6. An mounting groove 8 is opened on the upper wall of the right civil defense door panel 2, and the housing 3 can be inserted into the mounting groove 8. A locking mechanism 9 is installed on the upper wall of the base 5, and the locking mechanism 9 is located on the outer side of the sliding groove 6. A clearance groove 10 is opened on the side wall of the right civil defense door panel 2, and the locking mechanism 9 can pass through the side wall of the right civil defense door panel 2 through the clearance groove 10. In this technical solution, the assembly relationship between the left air-raid shelter door panel 1, the fixing frame 4, and the housing 3 is as follows: The left air-raid shelter door panel 1 serves as the fixed foundation component of the mechanism. The top of the door panel 1 is fixedly installed with the fixing frame 4 by welding or bolting. The fixing frame 4 has an overall "U"-shaped frame structure, with reserved rotational installation space on the inner side to accommodate the housing 3. The two side walls of the housing 3 are rotatably connected to the inner side walls of the fixing frame 4 via rotating shafts. Wear-resistant bearings are installed between the rotating shafts and the fixing frame 4 to ensure that the housing 3 can rotate flexibly around the fixing frame 4 (the rotation angle range is usually 0°-90°). This allows the installation posture of the housing 3 to be adjusted during the sliding of the right air-raid shelter door panel 2, ensuring that it can be stably installed above the right air-raid shelter door panel 2. The support and cooperation between the left air-raid shelter door panel 1 and the base 5, and the right air-raid shelter door panel 2: The lower wall of the left air-raid shelter door panel 1 is fixedly connected to one end of the base 5 by bolts. The base 5 is a rectangular metal plate structure, and its length is slightly greater than the total width of the left and right air-raid shelter door panels after splicing, providing sufficient sliding space for the right air-raid shelter door panel 2. The right air-raid shelter door panel 2 slides with the sliding groove 6 of the base 5 through the bottom slider 7. The cross-section of the sliding groove 6 is "T" shaped or "U" shaped. The shape of the slider 7 is perfectly matched with the sliding groove 6, and the length of the slider 7 is consistent with the width of the right air-raid shelter door panel 2, which can prevent the right air-raid shelter door panel 2 from shifting left and right during the sliding process. At the same time, the cooperation gap between the slider 7 and the sliding groove 6 is controlled between 0.1-0.3mm, which not only ensures smooth sliding, but also improves the fitting accuracy between the door panel and the base. The positioning and fit between the chassis 3 and the mounting slot 8: The mounting slot 8, located on the upper wall of the right air-raid shelter door 2, has an opening size that perfectly matches the cross-sectional dimensions of the bottom of the chassis 3. Furthermore, the depth of the mounting slot 8 is 1 / 3 to 1 / 2 of the height of the chassis 3. This ensures that after the chassis 3 is inserted into the mounting slot 8, it achieves stable positioning without causing disassembly difficulties due to excessive insertion. When the right air-raid shelter door 2 slides to the closed position, the chassis 3 can rotate around the fixing frame 4 to a horizontal state, with its bottom precisely inserted into the mounting slot 8, forming a stable "left fixed - right supported" structure to prevent the chassis 3 from shaking during use. The synergistic effect of the locking mechanism 9 and the clearance groove 10: The locking mechanism 9, installed on the upper wall of the base 5, is fixed to the preset mounting holes on the outside of the slide groove 6 by bolts. Its installation position corresponds one-to-one with the clearance groove 10 on the side wall of the right air defense door panel 2. The width of the clearance groove 10 is slightly larger than the maximum width of the locking mechanism 9 (the gap is controlled at 0.5-1mm) to ensure that the locking mechanism 9 can smoothly pass through the clearance groove 10 when the right air defense door panel 2 slides. At the same time, the length of the clearance groove 10 is adapted to the sliding stroke of the right air defense door panel 2. When the right air defense door panel 2 slides to the closed position, the locking mechanism 9 is exactly in the middle position of the clearance groove 10, realizing bidirectional limiting of the right air defense door panel 2 and preventing the door panel from shifting in the horizontal direction.

[0015] In some technical solutions, the locking mechanism 9 includes a baffle plate 91, a spherical groove 92 and a ball bearing 93. The baffle plate 91 is installed on the upper wall of the base 5. The cross-section of the baffle plate 91 is L-shaped. The upper wall of the baffle plate 91 is provided with a spherical groove 92. A ball bearing 93 is installed in the spherical groove 92. The ball bearing 93 can fit against the inner wall of the clearance groove 10.

[0016] In this technical solution, the structure and installation requirements of the shield 91 are as follows: The shield 91 is made of high-strength steel plate by stamping, with an "L"-shaped cross-section. The height of its vertical section is consistent with the thickness of the right air-raid shelter door panel 2, and the width of its horizontal section is 50-80mm. The vertical section of the shield 91 is fixed to the upper wall of the base 5 by bolts, while the horizontal section extends above the right air-raid shelter door panel 2, forming a vertical limit on the door panel to prevent the right air-raid shelter door panel 2 from jumping in the vertical direction. At the same time, the inner side wall of the shield 91 (the side closest to the right air-raid shelter door panel 2) needs to be polished, and the surface roughness is controlled below Ra0.8 to avoid excessive friction with the side wall of the door panel. The spherical groove 92 and the ball 93 are designed to fit together: The spherical groove 92 on the upper wall of the baffle plate 91 has a diameter 0.2-0.3 mm larger than the diameter of the ball 93, ensuring that the ball 93 can roll flexibly within the groove and will not fall out. The depth of the spherical groove 92 is 1 / 2-2 / 3 of the diameter of the ball 93, ensuring that the ball 93 has sufficient rolling space while effectively limiting its movement. The ball 93 is made of high-hardness bearing steel (such as GCr15), and its surface is hardened to a hardness of HRC60-65, improving wear resistance and service life. The contact function between the ball bearing 93 and the clearance groove 10: When the right air defense door panel 2 slides, the inner wall of the clearance groove 10 and the ball bearing 93 remain in contact. The ball bearing 93 rolls synchronously with the door panel in the spherical groove 92, converting the sliding friction between the right air defense door panel 2 and the shield 91 into rolling friction. The coefficient of friction is reduced from 0.3-0.5 to 0.05-0.1, which greatly reduces the wear of the parts. At the same time, the contact between the ball bearing 93 and the clearance groove 10 can also play a guiding role, further ensuring that the right air defense door panel 2 slides in a straight line along the slide groove 6, avoiding jamming or deviation.

[0017] In some technical solutions, the side walls of the left air defense door panel 1 and the right air defense door panel 2 are both equipped with supporting angle irons 11, and the lower wall of the supporting angle irons 11 is attached to the upper wall of the base 5.

[0018] In this technical solution, the structure and installation method of the supporting angle iron 11 are as follows: The supporting angle iron 11 is made of galvanized angle steel (usually 50×50×5mm or 60×60×6mm). One side wall is fixed to the side wall of the door panel by welding or bolts (the bolt spacing is controlled at 150-200mm), while the other side wall is placed horizontally, with the lower wall tightly fitted to the upper wall of the base 5. At least two supporting angle irons 11 are installed on the side wall of each door panel, located at both ends of the door panel (100-150mm away from the edge of the door panel) to ensure even distribution of the supporting force. The supporting angle iron 11 serves two main functions: First, it distributes the weight of the door panel onto the base 5, preventing the door panel from bearing force solely through the bottom slider or fixed point, thus reducing deformation caused by excessive localized stress. Second, when encountering external shock waves or compressive forces, the supporting angle iron 11 can withstand some lateral forces, preventing breakage at the connection between the door panel and the base, and enhancing the overall impact resistance of the fire door. Furthermore, the close fit between the supporting angle iron 11 and the base 5 fills the small gaps between the door panel and the base, further improving the sealing performance of the mechanism.

[0019] In some technical solutions, a rubber pad 12 is fitted to the upper wall of the mounting slot 8, and the rubber pad 12 can fit against the lower wall of the chassis 3.

[0020] In this technical solution, the material and installation requirements for the rubber pad 12 are as follows: The rubber pad 12 is made of nitrile rubber or EPDM rubber. These materials have good elasticity (Shore hardness of 50-60HA), wear resistance, and aging resistance, and can adapt to the long-term use environment of civil defense projects. The rubber pad 12 is fixed to the upper wall of the erection trough 8 by strong adhesive or vulcanization process. Its size is consistent with the opening size of the erection trough 8, and its thickness is 3-5mm, ensuring that the rubber pad 12 can completely cover the upper wall of the erection trough 8, and that the chassis 3 will not be unable to be smoothly inserted due to excessive thickness. The rubber pad 12 has a dual function: First, sealing function: When the chassis 3 is inserted into the mounting slot 8, the rubber pad 12 is squeezed by the chassis 3 and undergoes elastic deformation, filling the tiny gap between the chassis 3 and the mounting slot 8, preventing external dust, moisture or toxic gases from entering the chassis through the gap, and protecting the control components inside the chassis; Second, buffering function: When the door panel is opened or closed or when it encounters vibration, the rubber pad 12 can absorb the impact force between the chassis 3 and the mounting slot 8, avoiding damage to components caused by hard contact, and reducing the noise generated by chassis shaking.

[0021] In some technical solutions, a support frame 13 is rotatably installed on the side wall of the right air defense door panel 2, and a positioning groove 14 is opened on the side wall of the fixing frame 4. The end of the support frame 13 away from the right air defense door panel 2 can be inserted into the positioning groove 14, and the upper wall of the support frame 13 can fit against the lower wall of the casing 3.

[0022] In this technical solution, the support frame 13 has the following installation and rotation characteristics: the support frame 13 is rotatably connected to the side wall of the right air-raid shelter door panel 2 via a hinge or pivot. The installation height of the pivot is consistent with the height of the positioning groove 14 on the fixed frame 4, ensuring that the support frame 13 can rotate horizontally to the positioning groove 14. When not in use, the support frame 13 can rotate downward around the pivot until it fits against the side wall of the right air-raid shelter door panel 2, avoiding affecting the sliding of the door panel; when in use, it can rotate upward to a horizontal position, with its end away from the door panel precisely aligned with the positioning groove 14. The positioning groove 14 is designed as follows: It is located at a predetermined position on the side wall of the fixing frame 4. The groove opening is U-shaped, with a depth of 15-20mm. The groove width matches the end width of the support frame 13, ensuring smooth insertion of the support frame 13 without loosening. The inner wall of the positioning groove 14 is smoothed to reduce frictional resistance during insertion of the support frame 13. Chamfers are also provided at the groove opening edges to facilitate quick alignment and insertion of the support frame 13. The supporting function of the support frame 13: When the support frame 13 is inserted into the positioning slot 14, its top fits tightly against the lower wall of the chassis 3, forming an auxiliary support point for the chassis 3 (together with the mounting slot 8, it forms a "two-point support"), which avoids the situation where the chassis 3 is subjected to excessive force at a single point when it relies solely on the mounting slot 8 for support; especially when the door panel is subjected to vibration or impact, the support frame 13 can share part of the weight of the chassis 3, further improving the installation stability of the chassis 3.

[0023] In some technical solutions, the support frame 13 includes a frame body 131, a sliding hole 132 and a pin 133. The frame body 131 is rotatably installed on the side wall of the right air defense door panel 2. The side wall of the frame body 131 is provided with a sliding hole 132. The pin 133 is slidably installed in the sliding hole 132 and can be inserted into the positioning groove 14.

[0024] In this technical solution, the design of the frame 131 and the sliding hole 132 is as follows: The frame 131 is made of rectangular steel pipe or flat steel, and its length is determined according to the distance between the right air defense door panel 2 and the fixed frame 4 (ensuring that the frame 131 can reach the positioning groove 14 after horizontal rotation). The sliding hole 132 is opened along the length direction of the frame 131, and the diameter of the hole is 0.5-1mm larger than the diameter of the pin 133, ensuring that the pin 133 can slide flexibly in the sliding hole 132, with a sliding stroke of 20-30mm, meeting the needs of the pin 133 to be inserted into or pulled out of the positioning groove 14. Locking mechanism of pin 133: Pin 133 is a cylindrical metal rod with a round handle at one end for easy manual pushing by the operator; the other end is chamfered for easy insertion into the positioning groove 14. When the support frame 13 is rotated to a horizontal position and its end is aligned with the positioning groove 14, the pin 133 is pushed to slide along the sliding hole 132, so that the end of the pin 133 is inserted into the positioning groove 14. At this time, the pin 133 passes through both the sliding hole 132 and the positioning groove 14, locking the support frame 13 and the fixing frame 4 to prevent the support frame 13 from falling out of the positioning groove 14 during use; when unlocking is required, simply pull the pin 133 in the opposite direction. The operation is simple and convenient, requiring no additional tools.

[0025] Working principle: 1. Door panel sliding: The right door panel precisely moves closer to the left door panel. Power drive: The operator pushes the right-side fire door panel 2, causing the slider 7 at its bottom to slide along the groove 6 of the base 5 (the "T" / "U" shaped fitting structure between the groove 6 and the slider 7 ensures that the door panel does not shift). Assisted guidance: During the sliding process, the locking mechanism 9 (baffle plate 91) on the base 5 passes through the door panel through the clearance groove 10 on the side wall of the right door panel, and the ball 93 in the spherical groove 92 of the baffle plate 91 rolls against the inner wall of the clearance groove 10, converting sliding friction into rolling friction, reducing jamming, and assisting the right door panel to slide smoothly to the closed position where it is in contact with the left civil defense door panel 1. II. Chassis Mounting: Securely fix the chassis and reinforce the door panel connections. Chassis rotation and positioning: After the right door panel is closed, the operator rotates the chassis 3 on the top fixed frame 4 of the left door panel 1 (rotating around the pivot 0°-90° to a horizontal state) so that the bottom of the chassis 3 is inserted into the mounting slot 8 on the upper wall of the right door panel 2; Buffer sealing adapter: The rubber pad 12 inside the mounting groove 8 is elastically deformed by the pressure of the chassis 3, filling the gap, which not only fixes the chassis, but also prevents external dust / gas from entering the chassis. III. Locking and locking: Multiple structures ensure door panel stability Locking mechanism limit: When the right door panel slides to the closed position, the locking mechanism 9 is exactly in the middle of the clearance groove 10. The horizontal section of the baffle 91 forms a vertical limit (anti-jumping) on ​​the right door panel, and the contact between the ball bearing 93 and the clearance groove 10 restricts the horizontal displacement of the door panel. Support frame auxiliary fixation: Rotate the support frame 13 on the side wall of the right door panel 2 to a horizontal position, align its end with the positioning groove 14 of the fixing frame 4, and push the pin 133 on the support frame 13 into the positioning groove 14 along the sliding hole 132 to lock the support frame; at this time, the top of the support frame is in contact with the lower wall of the chassis 3, and together with the mounting groove 8, it forms a "two-point support" for the chassis, further strengthening the connection between the door panel and the chassis. IV. Unlock / Activate: Simply reverse the operation. When it is necessary to open the air-raid shelter door, follow the steps in reverse: Pull the pin 133 to disengage it from the positioning groove 14, and rotate the support frame 13 until it is flush with the side wall of the right door panel; Rotate the housing 3 upwards (around the axis of the fixed frame 4) to disengage it from the mounting slot 8 on the right door panel; Push the right door panel 2 so that it slides along the groove 6 away from the left door panel to unlock and open.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A locking linkage mechanism for a civil defense door, comprising a left civil defense door panel (1), a right civil defense door panel (2), and a housing (3), characterized in that: A fixing frame (4) is installed on the upper wall of the left air defense door panel (1), and a housing (3) is rotatably installed on the inner side of the fixing frame (4). A base (5) is installed on the lower wall of the left air defense door panel (1), and a right air defense door panel (2) is slidably installed on the upper wall of the base (5). The housing (3) can be mounted on the upper part of the right air defense door panel (2). The upper wall of the base (5) is provided with a sliding groove (6), and the lower wall of the right air defense door panel (2) is provided with a slider (7). The slider (7) is slidably installed in the sliding groove (6). The upper wall of the right air defense door panel (2) is provided with a mounting groove (8), and the chassis (3) can be inserted into the mounting groove (8). A locking mechanism (9) is installed on the upper wall of the base (5). The locking mechanism (9) is located on the outside of the slide groove (6). A clearance groove (10) is provided on the side wall of the right air defense door panel (2). The locking mechanism (9) can pass through the side wall of the right air defense door panel (2) through the clearance groove (10).

2. The interlocking linkage mechanism for a civil defense door according to claim 1, characterized in that: The locking mechanism (9) includes a baffle plate (91), a spherical groove (92) and a ball (93). The baffle plate (91) is installed on the upper wall of the base (5). The cross-section of the baffle plate (91) is L-shaped. The upper wall of the baffle plate (91) is provided with a spherical groove (92). A ball (93) is installed in the spherical groove (92). The ball (93) can fit against the inner wall of the clearance groove (10).

3. The interlocking linkage mechanism for a civil defense door according to claim 1, characterized in that: The left air defense door panel (1) and the right air defense door panel (2) are both equipped with supporting angle irons (11), and the lower wall of the supporting angle irons (11) is attached to the upper wall of the base (5).

4. The interlocking linkage mechanism for a civil defense door according to claim 1, characterized in that: A rubber pad (12) is fitted to the upper wall of the mounting slot (8), and the rubber pad (12) can fit against the lower wall of the chassis (3).

5. The interlocking linkage mechanism for a civil defense door according to claim 1, characterized in that: The right air defense door panel (2) is rotatably mounted with a support frame (13), and the side wall of the fixed frame (4) is provided with a positioning groove (14). The end of the support frame (13) away from the right air defense door panel (2) can be inserted into the positioning groove (14), and the upper wall of the support frame (13) can be attached to the lower wall of the chassis (3).

6. The interlocking linkage mechanism for a civil defense door according to claim 5, characterized in that: The support frame (13) includes a frame body (131), a sliding hole (132) and a pin (133). The frame body (131) is rotatably installed on the side wall of the right air defense door panel (2). The side wall of the frame body (131) has a sliding hole (132). The pin (133) is slidably installed in the sliding hole (132). The pin (133) can be inserted into the positioning groove (14).

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