Adjustable connecting device for chimeric civil air defense door

Abstract

The utility model relates to the technical field of civil air defence door discloses a kind of embedded civil air defence door adjustable connecting device, including door frame, the front side inside rear end of door frame is provided with connecting mechanism, the connecting mechanism is used to increase the stability of civil air defence door rotation, the front side right end of door frame is fixedly connected with fixed strip, the front side of fixed strip is provided with stabilizing mechanism, the stabilizing mechanism is used to increase the vertical support property when civil air defence door is closed, the connecting mechanism includes two mounting blocks, the rear side of two mounting blocks is fixedly connected in the front side inside rear end of door frame.In the utility model, mounting block is fixed to door frame, bolt is used to penetrate mounting block and is threadedly connected with door frame, then card strip is inserted along the slot of mounting block and is fixed with protective door by screw, the effect that protective door and door frame are stably connected is realized, connection loosening due to long time use is avoided, and the rotation stability of civil air defence door is effectively increased.

Description

Technical Field

[0001] This utility model relates to the field of civil defense door technology, and in particular to an adjustable connecting device for a snap-fit ​​civil defense door. Background Technology

[0002] The adjustable connecting device for the interlocking type air defense door is used to connect the door body and the door frame. It is made of metal and is used to connect and fix it to the door frame. It has various shapes and structures and is equipped with mounting holes or connecting parts so that it can be tightly connected to the door frame by bolts or welding. During the installation of the air defense door, the connecting device can help the construction workers to accurately install the door body onto the door frame.

[0003] A search revealed Chinese patent publication number CN220226643U, which discloses a civil defense door with a dual positioning structure, belonging to the field of civil defense doors. The door includes a door frame, on which a civil defense door body is mounted. An installation guide rail is installed at the inner end of the civil defense door body. The installation guide rail consists of an installation guide plate and an installation plate. Two installation plates are symmetrically installed at the upper and lower ends of the installation guide plate. A support plate is installed at the inner end of the civil defense door body below the installation guide rail. A connecting plate is slidably mounted on the installation guide plate. By setting the installation guide rail, connecting plate, and positioning structure on the civil defense door body, their cooperation strengthens the positioning and fixing of the civil defense door body. This allows the civil defense door body to be positioned by a positioning device composed of the installation guide rail, connecting plate, and positioning structure, while possessing traditional mechanical locking. This dual positioning results in better impact resistance and safety performance of the civil defense door body. However, in actual use, although the hinged connection offers flexible opening and closing, it is not suitable for heavy doors, leading to insufficient connection stability. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides an adjustable connecting device for interlocking air defense doors, which aims to improve the problem that although hinged connections are flexible in opening and closing, they are not suitable for heavy doors and will lead to insufficient connection stability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an adjustable connecting device for a fitted air-raid shelter door, including a door frame, a connecting mechanism provided at the rear end of the front side of the door frame, the connecting mechanism being used to increase the stability of the air-raid shelter door rotation, a fixing strip being fixedly connected to the right end of the front side of the door frame, a stabilizing mechanism being provided at the front side of the fixing strip, the stabilizing mechanism being used to increase the vertical support of the air-raid shelter door when it is closed; The connecting mechanism includes two mounting blocks. The rear sides of the two mounting blocks are fixedly connected to the rear end of the front side of the door frame. Bolts penetrate the four corners of the front side of the two mounting blocks. The rear ends of the outer walls of the bolts are threaded to the rear end of the front side of the door frame. Insertion slots are provided on the left side of the two mounting blocks. Locking strips are slidably connected inside the two insertion slots. Multiple screws are threaded to the left side of the two locking strips. A protective door is provided on the front side of the door frame. The same rotating component is provided on the front side of the two mounting blocks. An opening and closing component is provided on the rear side of the protective door. A sealing component is provided inside the door frame.

[0006] The above technical solution involves fixing the mounting block to the door frame, using bolts to thread the mounting block and the door frame together to form a stable foundation, then sliding the clip along the groove of the mounting block and fixing the clip to the protective door with screws. This achieves a stable connection between the protective door and the door frame, preventing the connection from loosening due to long-term use and effectively increasing the rotational stability of the air-raid shelter door.

[0007] As a further description of the above technical solution: The stabilizing mechanism includes a baffle, the rear side of which is rotatably connected to the front side of the fixing strip. A fixing block is fixedly connected to the top rear side of the baffle. A spring is fixedly connected to both the left and right sides of the fixing block. A groove is provided on the top front side of the fixing strip. A round hole is provided on the top left and right sides of the fixing strip. A pressing component is provided on the top left and right sides of the fixing strip.

[0008] The above technical solution involves a baffle that is rotatably connected to a fixing strip, allowing the baffle to rotate around the connection point. When the air-raid shelter door is closed, the baffle is pushed to fit, causing the fixing block to embed into the groove. The spring is then compressed and enters the round hole, achieving the effect of automatically obtaining vertical support force when the air-raid shelter door is closed. The compression component balances the support force, effectively preventing the air-raid shelter door from vertical displacement due to external forces, and significantly improving the vertical support and structural stability of the air-raid shelter door when it is closed.

[0009] As a further description of the above technical solution: The rotating assembly includes two fixed sleeves, the rear sides of which are fixedly connected to the front side of the mounting block. A rotating rod is rotatably connected between adjacent fixed sleeves, and the outer wall of the rotating rod is fixedly connected to the inner left side of the protective door.

[0010] The above technical solution involves two fixed sleeves that are fixedly connected to the front of the mounting block to provide a mounting base for the rotating rod. The two fixed sleeves are rotatably connected to the rotating rod, and the outer wall of the rotating rod is fixedly connected to the left side of the inside of the protective door, so that the protective door can move with the rotation of the rotating rod.

[0011] As a further description of the above technical solution: The rotating assembly also includes two rotating balls, the outer walls of which are rotatably connected to the inside of the fixed sleeve. The upper and lower ends of the rotating rod are provided with semi-circular grooves, and the two rotating balls are rotatably connected to the semi-circular grooves.

[0012] Through the above technical solution: the rotating ball is rotatably connected inside the fixed sleeve and cooperates with the semi-circular groove of the rotating rod. When the protective door is rotated, the rotating ball rolls in the semi-circular groove, providing support for the rotating rod and reducing frictional resistance, while limiting axial displacement, so as to realize the stable and smooth rotation of the protective door and ensure the reliability of the opening and closing process.

[0013] As a further description of the above technical solution: The opening and closing assembly includes a lock, the front side of which is fixedly connected to the rear side of the protective door, two insertion rods are slidably connected to the right side of the lock, a rotating column is rotatably connected to the rear side of the lock, and two round holes are opened on the right side of the inside of the door frame.

[0014] Through the above technical solution: the opening and closing component is fixed to the rear side of the protective door by locking, the insertion rod slides into the round hole of the door frame along the locking, the rotation column is linked to the internal structure to lock the insertion rod, and the reverse rotation unlocks and pulls out the insertion rod. The rotation column and the insertion rod cooperate to realize the mechanical locking after the protective door is closed and the convenient unlocking when it is opened, ensuring the fixed position and operational flexibility of the air defense door in different states.

[0015] As a further description of the above technical solution: The opening and closing assembly also includes multiple connecting rods, the front ends of which are fixedly connected to the rear side of the outer wall of the rotating column, and the rear ends of which are fixedly connected to the same rotating ring.

[0016] Through the above technical solution: the rotating ring of the opening and closing component is fixedly connected to the rotating column through the connecting rod. Rotating the rotating ring drives the rotating column to rotate synchronously, controlling the extension or retraction of the insertion rod. The rotating ring and the connecting rod form a linkage structure, amplifying the operating torque, making the locking and unlocking operation of the insertion rod easier, improving the convenience of use for operators, and reducing the difficulty of manual operation.

[0017] As a further description of the above technical solution: The sealing assembly includes multiple main sealing strips, with the opposite sides of the main sealing strips fixedly connected to the inner perimeter of the door frame, and secondary sealing strips fixedly connected to the inner perimeter of the protective door.

[0018] Through the above technical solution: the main sealing strip of the sealing component is fixed inside the door frame around the perimeter, and the secondary sealing strip is fixed inside the protective door around the perimeter. After the protective door is closed and locked, the two are squeezed together and elastically deformed to fill the gaps. The main sealing strip and the secondary sealing strip work together to form a double sealing barrier, effectively preventing external airflow, dust and impact energy from being transmitted through the gaps, significantly improving the sealing performance and protection capability of the air-raid shelter door.

[0019] As a further description of the above technical solution: The extrusion assembly includes two springs, which are fixedly connected to the top left and right sides of the fixing bar. Extrusion plates are fixedly connected to the opposite sides of the two springs, and extrusion columns are fixedly connected to the adjacent sides of the two extrusion plates.

[0020] Through the above technical solution: the second spring of the extrusion assembly is fixed to the top of the fixing bar and connected to the extrusion plate. The extrusion plate drives the extrusion column to move. The extrusion column compresses the first spring, causing the fixing block to exit the groove. The second spring, together with the extrusion plate and the extrusion column, provides controllable extrusion force when opening the air-raid shelter door, releasing the vertical support constraint of the stabilizing mechanism. At the same time, the elastic resistance of the second spring avoids excessive operating force, ensuring the safety of the unlocking process.

[0021] This utility model has the following beneficial effects: 1. In this utility model, by fixing the mounting block to the door frame and using bolts to thread the mounting block and the door frame to form a stable foundation, the clip is slidably inserted along the groove of the mounting block and fixed to the protective door with screws, thus achieving a stable connection between the protective door and the door frame, avoiding loosening of the connection due to long-term use, and effectively increasing the rotational stability of the air defense door.

[0022] 2. In this utility model, the baffle and the fixing strip are rotatably connected, so that the baffle can rotate around the connection point. When the air defense door is closed, the baffle is pushed to fit, which drives the fixing block to be embedded in the groove. The spring is squeezed and enters the round hole, which realizes the effect of automatically obtaining vertical support force when the air defense door is closed. The compression component balances the support force, effectively preventing the air defense door from vertically displacing due to external force, and significantly improving the vertical support and structural stability of the air defense door in the closed state. Attached Figure Description

[0023] Figure 1 This is a perspective view of an adjustable connecting device for a fitted air-raid shelter door proposed in this utility model; Figure 2 This is a front view of an adjustable connecting device for a fitted air-raid shelter door proposed in this utility model; Figure 3 This is a schematic diagram of the locking strip in an adjustable connecting device for a fitted air-raid shelter door proposed in this utility model; Figure 4This is a schematic diagram of the structure of the fixing block in an adjustable connecting device for a fitted air-raid shelter door proposed in this utility model; Figure 5 This is a schematic diagram of the extrusion column in an adjustable connecting device for a fitted air-raid shelter door proposed in this utility model; Figure 6 This is a schematic diagram of the main sealing strip in an adjustable connecting device for a nested air-raid shelter door proposed in this utility model.

[0024] Legend: 1. Door frame; 2. Connecting mechanism; 201. Mounting block; 202. Bolt; 203. Insertion slot; 204. Locking strip; 205. Screw; 206. Security door; 207. Rotating assembly; 2071. Fixing sleeve; 2072. Rotating rod; 2073. Semicircular groove; 2074. Turning ball; 208. Opening and closing assembly; 2081. Lock; 2082. Insertion rod; 2083. Rotating column; 208 4. Round hole two; 2085. Connecting rod; 2086. Rotating ring; 209. Sealing assembly; 2091. Main sealing strip; 2092. Secondary sealing strip; 3. Fixing strip; 4. Stabilizing mechanism; 401. Baffle; 402. Fixing block; 403. Spring one; 404. Groove; 405. Round hole one; 406. Extrusion assembly; 4061. Spring two; 4062. Extrusion plate; 4063. Extrusion column. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0026] Reference Figure 1 and Figure 3 An embodiment of this utility model is provided: an adjustable connecting device for a fitted air-raid shelter door, including a door frame 1, a connecting mechanism 2 is provided at the rear end of the front side of the door frame 1, the connecting mechanism 2 is used to increase the stability of the air-raid shelter door rotation, a fixing strip 3 is fixedly connected to the right end of the front side of the door frame 1, and a stabilizing mechanism 4 is provided at the front side of the fixing strip 3, the stabilizing mechanism 4 is used to increase the vertical support of the air-raid shelter door when it is closed. The connecting mechanism 2 includes two mounting blocks 201. The rear sides of the two mounting blocks 201 are fixedly connected to the rear end of the front side of the door frame 1. Bolts 202 are passed through the four corners of the front side of the two mounting blocks 201. The rear ends of the outer walls of the bolts 202 are threaded to the rear end of the front side of the door frame 1. Insertion slots 203 are opened on the left side of the two mounting blocks 201. The inserts 203 are slidably connected to the inside of the two insertion slots 203. Multiple screws 205 are threaded to the left side of the two inserts 204. A protective door 206 is provided on the front side of the door frame 1. The same rotating component 207 is provided on the front side of the two mounting blocks 201. An opening and closing component 208 is provided on the rear side of the protective door 206. A sealing component 209 is provided inside the door frame 1. Specifically, in the connecting mechanism 2, the rear sides of the two mounting blocks 201 are fixedly connected to the rear end of the front side of the door frame 1, forming a basic installation structure. To ensure a stable connection between the mounting blocks 201 and the door frame 1, bolts 202 are inserted through the four corners of the front side of the two mounting blocks 201. The rear ends of the outer walls of the multiple bolts 202 are threadedly connected to the rear end of the front side of the door frame 1. By tightening the bolts 202, the mounting blocks 201 are fixed to the door frame 1. The insertion slots 203 on the left side of the two mounting blocks 201 form a sliding fit structure with the retaining strip 204. The retaining strip 204 is slidably inserted along the insertion slots 203. After the retaining strip 204 is in place, it is fixed to the door frame 1 by multiple threads. The screw 205 connected to the left side of the clip 204 fixes the clip 204 to the protective door 206, establishing a connection between the protective door 206 and the mounting block 201. This also increases the stability of the mounting block 201 and prevents the bolt 202 from loosening after prolonged use. Through the fixed connection between the mounting block 201 and the door frame 1 by the bolt 202, the sliding fit of the clip 204 in the insertion slot 203, and the fixing by the screw 205, a stable connection between the protective door 206 and the door frame 1 is achieved. This ensures stable rotation, smooth opening and closing of the protective door 206, and a good sealing effect after closing, ultimately increasing the rotational stability of the air defense door.

[0027] Reference Figure 4 and Figure 5 The stabilizing mechanism 4 includes a baffle 401, the rear side of which is rotatably connected to the front side of the fixing strip 3. A fixing block 402 is fixedly connected to the top of the rear side of the baffle 401. Springs 403 are fixedly connected to the left and right sides of the fixing block 402. A groove 404 is provided on the top of the front side of the fixing strip 3. A round hole 405 is provided on the top of the left and right sides of the fixing strip 3. A pressing component 406 is provided on the top of the left and right sides of the fixing strip 3. Specifically, the rear side of the baffle 401 is rotatably connected to the front side of the fixing strip 3, forming a rotatable basic structure. The fixing block 402, which is fixedly connected to the top of the rear side of the baffle 401, cooperates with the groove 404 opened at the top of the front side of the fixing strip 3. The springs 403, which are fixedly connected to the left and right sides of the fixing block 402, have their other ends connected to the compression components 406 at the top of the left and right sides of the fixing strip 3, forming an elastic support system. When the air defense door is closed, it pushes the baffle 401 to rotate around the rotation connection point at the front side of the fixing strip 3 until the baffle is closed. Plate 401 is attached to the surface of the air-raid shelter door. Fixing block 402 moves with plate 401 to directly above groove 404. Spring 403 is in a naturally extended state. As the air-raid shelter door closes further, fixing block 402 gradually embeds into groove 404. Spring 403 is compressed by the reverse force of compression component 406, resulting in elastic deformation. The elastic force of spring 403 is transmitted to plate 401 through fixing block 402, causing plate 401 to tightly abut against the air-raid shelter door, thus providing vertical support for the closed air-raid shelter door. The circular holes 405 on the top left and right sides of the fixing strip 3 provide installation space and movement guidance for the extrusion assembly 406. The internal structure of the extrusion assembly 406 cooperates with the spring 403. During the process of the fixing block 402 being embedded in the groove 404, the circular holes 405 apply extrusion force to the spring 403. At the same time, when the spring 403 rebounds, the extrusion assembly 406 limits its excessive extension, ensuring that the elastic force of the spring 403 acts stably on the fixing block 402 and the baffle 401. The rotational connection between plate 401 and fixing strip 3, the engagement between fixing block 402 and groove 404, and the elastic cooperation between spring 403 and pressing assembly 406 enable the stabilizing mechanism 4 to automatically provide vertical support force when the air defense door is closed. The elastic deformation of spring 403 absorbs part of the impact force, and the limiting effect of pressing assembly 406 keeps the support force balanced, avoiding vertical displacement of the air defense door due to external impact, thereby effectively increasing the vertical support and stability of the air defense door when it is closed.

[0028] Reference Figure 3 and Figure 6The rotating assembly 207 includes two fixed sleeves 2071, the rear sides of which are fixedly connected to the front side of the mounting block 201. A rotating rod 2072 is rotatably connected between adjacent fixed sleeves 2071. The outer wall of the rotating rod 2072 is fixedly connected to the inner left side of the protective door 206. The rotating assembly 207 also includes two rotating balls 2074, the outer walls of which are rotatably connected to the inside of the fixed sleeves 2071. Semicircular grooves 2073 are provided at the upper and lower ends of the rotating rods 2072. The two rotating balls 2074 are rotatably connected to the semicircular grooves 2073. The opening and closing assembly 208 includes a lock 2081, the front side of which is fixedly connected to the rear side of the protective door 206. Two insertion rods 2082 are slidably connected to the right side of the lock 2081. A rotating column 2083 is rotatably connected to the rear side of the lock 2081. Two round holes 2084 are provided on the inner right side of the door frame 1. Specifically, two fixed sleeves 2071 are fixedly connected to the rear side of the mounting block 201, providing a mounting base for the rotating rod 2072. The two fixed sleeves 2071 are rotatably connected to the rotating rod 2072. The outer wall of the rotating rod 2072 is fixedly connected to the left side of the interior of the protective door 206, so that the protective door 206 can move with the rotation of the rotating rod 2072. The outer walls of the two rotating balls 2074 of the rotating assembly 207 are rotatably connected to the interior of the fixed sleeves 2071. The semi-circular grooves 2073 at the upper and lower ends of the rotating rod 2072 are connected to the rotating balls 2074. 074 is a rotating connection. When the protective door 206 is opened or closed, an external force acts on the protective door 206, causing the rotating rod 2072 to rotate. The rotating ball 2074 rolls within the semi-circular groove 2073, providing support for the rotating rod 2072 and reducing frictional resistance during rotation. It also limits the axial displacement of the rotating rod 2072, ensuring the protective door 206 remains stable during rotation and preventing swaying or deviation. This achieves a stable and smooth rotation of the protective door 206. In the opening and closing assembly 208, the front side of the locking 2081... Fixedly connected to the rear side of the protective door 206, when the protective door 206 rotates to the closed position, it pushes the two insertion rods 2082 to slide along the right side of the lock 2081, so that they are inserted into the corresponding round hole 2084 on the right side inside the door frame 1. Then, the rotating column 2083 is rotated. The rotating connection structure between the rotating column 2083 and the rear side of the lock 2081 drives the internal mechanical structure to move together during the rotation, further locking and fixing the insertion rods 2082 in the round hole 2084 of the door frame 1, thereby fixing the protective door 206 in the closed state. When the protective door 206 needs to be opened, the rotating column 2083 is rotated in the opposite direction to release the lock on the insertion rod 2082, and the insertion rod 2082 is pulled out from the second round hole 2084 of the door frame 1. Then, the rotating component 207 drives the protective door 206 to rotate around the rotating rod 2072 to open. This realizes the reliable locking and convenient opening function of the protective door 206 after it is closed. With the help of the rotating component 207, the entire process of the protective door 206 from rotation opening and closing to positioning and fixing is fully realized, ensuring the safety and stability of the air defense door during use.

[0029] Reference Figure 2 , Figure 5 and Figure 6The opening and closing assembly 208 also includes multiple connecting rods 2085. The front ends of the multiple connecting rods 2085 are all fixedly connected to the rear side of the outer wall of the rotating column 2083. The rear ends of the multiple rotating columns 2083 are all fixedly connected to the same rotating ring 2086. The sealing assembly 209 includes multiple main sealing strips 2091. The opposite sides of the multiple main sealing strips 2091 are all fixedly connected to the inner periphery of the door frame 1. The inner periphery of the protective door 206 is fixedly connected to the secondary sealing strips 2092. The pressing assembly 406 includes two springs 4061. The adjacent springs 4061 are all fixedly connected to the top of the left and right sides of the fixing strip 3. The opposite sides of the two springs 4061 are all fixedly connected to the pressing plate 4062. The adjacent pressing plate 4062 is fixedly connected to the pressing column 4063. Specifically, the front ends of multiple connecting rods 2085 of the opening and closing assembly 208 are fixedly connected to the rear side of the outer wall of the rotating column 2083, and the rear ends are jointly fixedly connected to the rotating ring 2086. When the rotating ring 2086 is rotated, the rotating column 2083 is driven to rotate synchronously through the connecting rods 2085. During the rotation of the rotating column 2083, its internal structure is linked with the insertion rod 2082, causing the insertion rod 2082 to slide along the right side of the locking 2081, thereby extending or retracting the insertion rod 2082. When the protective door 206 is closed in place, rotating the rotating ring 2086 causes the insertion rod 2082 to insert. The corresponding circular hole 2084 on the right side inside the entrance frame 1 locks the insertion rod 2082 through the mechanical cooperation of the rotating column 2083 and the locking 2081, thus fixing the protective door 206 in the closed state. When opening, the rotating ring 2086 is rotated in the opposite direction, causing the insertion rod 2082 to disengage from the slot and release the lock. In the sealing assembly 209, multiple main sealing strips 2091 are fixedly connected to the inside periphery of the door frame 1 on one side away from each other, and the secondary sealing strips 2092 are fixedly connected to the inside periphery of the protective door 206. When the protective door 206 is closed and locked by the opening and closing assembly 208, the main sealing strips are locked. The sealing strip 2091 and the secondary sealing strip 2092 are pressed together and filled the gap between the door frame 1 and the protective door 206. The elastic deformation of the main sealing strip 2091 and the secondary sealing strip 2092 forms a double sealing structure, preventing external airflow, dust or impact energy from being transmitted through the gap, ensuring the airtightness and protective performance of the air-raid shelter door. The adjacent ends of the two springs 4061 are fixedly connected to the top of the left and right sides of the fixing strip 3, and the far ends are connected to the compression plate 4062. The adjacent sides of the compression plate 4062 are fixedly connected to the compression column 4063. When it is necessary to open the air-raid shelter door, the compression column 4063 is moved towards the fixing strip 3. The two extrusion plates 4062 are squeezed, which drives the extrusion column 4063 to move. The extrusion column 4063 contacts and compresses the first spring 403. The compression of the first spring 403 causes the fixing block 402 to exit from the groove 404, releasing the vertical support constraint of the baffle 401 on the air defense door. The rotating rod 2072 of the rotating component 207 can rotate freely, pushing the protective door 206 to open around the rotating rod 2072. During the extrusion process, the second spring 4061 undergoes elastic deformation simultaneously, providing reverse resistance, making the extrusion operation force controllable and avoiding damage to the mechanism due to excessive external force.

[0030] Working principle: The bolts 202 passing through the four corners on the front side of the mounting block 201 are threaded to the door frame 1 to achieve a stable fixation. The insertion slots 203 on the left side of the two mounting blocks 201 form a sliding fit with the retaining strip 204. After the retaining strip 204 is slidably inserted into the insertion slot 203, the retaining strip 204 is fixed to the protective door 206 with the screws 205, so that the protective door 206 is connected to the mounting block 201, completing the basic assembly of the air-raid shelter door and the door frame 1. The two fixing sleeves 2071 of the rotating component 207 are fixed to the front side of the mounting block 201, providing an installation base for the rotating rod 2072. The rotating rod 2072 is rotatably connected between the two fixing sleeves 2071, and its outer wall is fixed to the left side of the interior of the protective door 206, so that the protective door 206 can rotate. When the rod 2072 rotates, the semi-circular grooves 2073 at the upper and lower ends of the rotating rod 2072 are rotatably connected to the rotating balls 2074 in the fixed sleeve 2071. When an external force is applied to the protective door 206 to drive the rotating rod 2072 to rotate, the rotating balls 2074 roll in the semi-circular grooves 2073, providing support and reducing friction, while limiting the axial displacement of the rotating rod 2072, ensuring the stable rotation of the protective door 206. During the closing process of the air-raid shelter door, the protective door 206 is first rotated around the rotating rod 2072 to the door frame 1 by the rotating assembly 207. The rear side of the baffle 401 of the stabilizing mechanism 4 moves with the protective door 206, rotating around the front rotating connection point of the fixed strip 3 until it fits against the surface of the protective door 206. The fixing block 402 at the top of the rear side of the baffle 401 moves to the top of the front side of the fixed strip 3. Above the groove 404, as the protective door 206 closes further, the fixing block 402 is embedded in the groove 404. The springs 403 on the left and right sides of the fixing block 402 are compressed by the opposing force of the compression assembly 406. The elastic force is transmitted to the baffle 401 through the fixing block 402, making the baffle 401 tightly abut against the air defense door, providing vertical support. The round holes 405 on the top of the left and right sides of the fixing strip 3 provide guidance for the compression assembly 406, ensuring that the springs 403 are stable in terms of force and rebound. After the protective door 206 is closed in place, the opening and closing assembly 208 is operated to lock it. The rotating ring 2086 drives the rotating column 2083 to rotate through the connecting rod 2085. The rotating column 2083 is linked to the internal structure of the locking 2081, pushing the two insertion rods 2082 along the right side of the locking 2081. Slide the rod into the second round hole 2084 on the right side inside the door frame 1. Continuously rotate the rotating column 2083 to further lock the insertion rod 2082, fixing the protective door 206 in the closed state. The sealing component 209 takes effect, and the main sealing strip 2091 around the inside of the door frame 1 and the secondary sealing strip 2092 around the inside of the protective door 206 are pressed and adhered to each other, forming a double sealing structure through elastic deformation. This prevents external airflow, dust, and impact energy from being transmitted through gaps, ensuring the sealing performance of the air defense door. When it is necessary to open the air defense door, the pressing component 406 of the pressing stabilizing mechanism 4 presses the pressing plates 4062 on both sides towards the fixing strip 3. The pressing plates 4062 drive the pressing column 4063 to move, compressing the first spring 403, causing the fixing block 402 to exit from the groove 404.Release the vertical support constraint of the baffle 401 on the air-raid shelter door, and rotate the rotating ring 2086 of the opening and closing assembly 208 in the opposite direction. This is linked to the rotating column 2083 via the connecting rod 2085, releasing the locking of the insertion rod 2082 and pulling it out of the second round hole 2084 in the door frame 1. The rotating assembly 207 then drives the protective door 206 to rotate and open around the rotating rod 2072. During the compression process, the elastic deformation of the second spring 4061 provides reverse resistance, ensuring controllable operating force and preventing damage to the mechanism.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable connecting device for a fitted air-raid shelter door, comprising a door frame (1), characterized in that: The front side of the door frame (1) is provided with a connecting mechanism (2) at the rear end. The connecting mechanism (2) is used to increase the stability of the air defense door rotation. The front right side of the door frame (1) is fixedly connected with a fixing strip (3). The front side of the fixing strip (3) is provided with a stabilizing mechanism (4). The stabilizing mechanism (4) is used to increase the vertical support when the air defense door is closed. The connecting mechanism (2) includes two mounting blocks (201). The rear sides of the two mounting blocks (201) are fixedly connected to the rear end of the front side of the door frame (1). Bolts (202) are passed through the four corners of the front side of the two mounting blocks (201). The rear ends of the outer walls of the bolts (202) are threaded to the rear end of the front side of the door frame (1). An insertion slot (203) is provided on the left side of the two mounting blocks (201). A retaining strip (204) is slidably connected inside the two insertion slots (203). A plurality of screws (205) are threadedly connected to the left side of the two retaining strips (204). A protective door (206) is provided on the front side of the door frame (1). The same rotating component (207) is provided on the front side of the two mounting blocks (201). An opening and closing component (208) is provided on the rear side of the protective door (206). A sealing component (209) is provided inside the door frame (1).

2. The adjustable connecting device for a fitted air-raid shelter door according to claim 1, characterized in that: The stabilizing mechanism (4) includes a baffle (401), the rear side of which is rotatably connected to the front side of the fixing strip (3). A fixing block (402) is fixedly connected to the top rear side of the baffle (401). A spring (403) is fixedly connected to both the left and right sides of the fixing block (402). A groove (404) is provided on the top front side of the fixing strip (3). A round hole (405) is provided on the top left and right sides of the fixing strip (3). An extrusion assembly (406) is provided on the top left and right sides of the fixing strip (3).

3. The adjustable connecting device for a fitted air-raid shelter door according to claim 1, characterized in that: The rotating assembly (207) includes two fixed sleeves (2071), the rear sides of which are fixedly connected to the front side of the mounting block (201), and a rotating rod (2072) is rotatably connected between adjacent fixed sleeves (2071). The outer wall of the rotating rod (2072) is fixedly connected to the inner left side of the protective door (206).

4. The adjustable connecting device for a fitted air-raid shelter door according to claim 3, characterized in that: The rotating assembly (207) also includes two rotating balls (2074), the outer walls of which are rotatably connected to the inside of the fixed sleeve (2071). The upper and lower ends of the rotating rod (2072) are provided with semi-circular grooves (2073), and the two rotating balls (2074) are rotatably connected to the semi-circular grooves (2073).

5. The adjustable connecting device for a fitted air-raid shelter door according to claim 1, characterized in that: The opening and closing assembly (208) includes a lock (2081), the front side of which is fixedly connected to the rear side of the protective door (206), the right side of which is slidably connected to two insertion rods (2082), the rear side of which is rotatably connected to a rotating column (2083), and the inside right side of the door frame (1) has two round holes (2084).

6. The adjustable connecting device for a fitted air-raid shelter door according to claim 5, characterized in that: The opening and closing assembly (208) also includes multiple connecting rods (2085), the front ends of which are fixedly connected to the rear side of the outer wall of the rotating column (2083), and the rear ends of which are fixedly connected to the same rotating ring (2086).

7. The adjustable connecting device for a fitted air-raid shelter door according to claim 1, characterized in that: The sealing assembly (209) includes multiple main sealing strips (2091), and the opposite sides of the multiple main sealing strips (2091) are fixedly connected to the inside periphery of the door frame (1). The inner periphery of the protective door (206) is fixedly connected with secondary sealing strips (2092).

8. The adjustable connecting device for a fitted air-raid shelter door according to claim 2, characterized in that: The extrusion assembly (406) includes two springs (4061), which are fixedly connected to the top of the left and right sides of the fixing strip (3). Extrusion plates (4062) are fixedly connected to the opposite sides of the two springs (4061), and extrusion columns (4063) are fixedly connected to the adjacent sides of the two extrusion plates (4062).

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