Double-leaf linkage self-sealing fixed threshold protection sealed door

Abstract

The utility model relates to the technical field of protective closed equipment, specifically relates to a double -leaf linkage formula self -sealing fixed door sill protective closed door, including door frame, one side of door frame is equipped with the door sill body, is equipped with two closed door body between door frame and door sill body, opening and closing subassembly, opening and closing subassembly install between door frame and door sill body, opening and closing subassembly are used for controlling the synchronous motion between two closed door body, sealing assembly, sealing assembly installs one side of closed door body, sealing assembly includes the several lock head of movable mounting in one side of closed door body, is set up with several lock holes on door frame and door sill body, and lock head and lock hole are adapted. Compared with the prior art, the application sets up mechanical linkage opening and closing mechanism, trigger type hydraulic self -locking mechanism and gravity type top sealing fence, realizes door leaf synchronous opening and closing, automatic locking and top automatic compensation sealing, significantly improves the whole week sealing reliability and operating efficiency of closed door, reduces the artificial dependence.

Description

Technical Field

[0001] This utility model relates to the field of protective sealing equipment technology, and in particular to a double-leaf linkage self-sealing fixed threshold protective sealing door. Background Technology

[0002] Airtight doors are key facilities in underground engineering, civil defense engineering, tunnels, equipment partitions, and special protected areas. Their main function is to achieve spatial isolation and sealing, blocking the spread of air, water, harmful gases, and dust between different areas. At the same time, they play a protective and buffering role when encountering external impact pressure, disasters, accidents, or special working conditions. Therefore, the sealing performance, structural reliability, and opening and closing efficiency of airtight doors are the core indicators that determine the safety of the protection system.

[0003] In existing technologies, airtight doors mostly adopt single-leaf or double-leaf structures, with double-leaf structures offering advantages in terms of passage width and ease of installation. However, traditional double-leaf airtight doors generally suffer from the following technical shortcomings: Firstly, there is a lack of a reliable linkage mechanism between the two leaves, relying primarily on manual opening and closing. Inconsistent operation can easily lead to asynchronous door leaf opening, resulting in misalignment, jamming, or incomplete closure, thus affecting sealing performance and even delaying operation time in emergencies. Secondly, existing airtight doors mostly use manual latches, mechanical knobs, or electronic locks, relying on manual confirmation of locking. In harsh environments, areas with limited visibility, or high-frequency use, this can easily lead to incomplete locking, missed locking, or forgetting to lock, resulting in decreased sealing performance. Thirdly, the top sealing of the door usually relies on fixed rubber strips or manual pressing structures. Due to installation errors in the door frame or deviations in the door leaf position, the top area often becomes a weak point in the seal, prone to gas leakage or pressure leakage. This problem is particularly prominent in airtight scenarios with high protection requirements. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a double-leaf linkage self-sealing fixed threshold protective airtight door to solve the problems of traditional double-leaf airtight doors having no reliable linkage mechanism, resulting in asynchronous operation, poor sealing, and reliance on manual locking which is prone to failure.

[0005] Based on the above objectives, this utility model provides a double-leaf linkage self-sealing fixed threshold protective airtight door, including a door frame and a fixed threshold body located at its bottom, wherein two airtight door bodies are symmetrically hinged and installed inside the door frame. An opening and closing assembly is installed between the door frame and the threshold body, and the opening and closing assembly is used to control the synchronous movement between the two airtight door bodies. A sealing assembly is installed on one side of the airtight door body. The sealing assembly includes several lock heads that are movably installed on one side of the airtight door body. Several lock holes are provided on the door frame and the threshold body. The lock heads and the lock holes are adapted to each other.

[0006] Preferably, a limiting plate is provided on one side of the door frame, and a limiting frame is slidably installed in the limiting plate. A first connecting arm is fixedly installed on one side of the airtight door body, and a limiting post is fixedly installed at one end of the first connecting arm. A sliding groove is provided in the limiting frame, and the limiting post is slidably installed in the sliding groove.

[0007] Preferably, a hydraulic cylinder is provided on one side of the airtight door body, a connecting rod is installed at the output end of the hydraulic cylinder, a connecting block is installed at the end of the connecting rod away from the hydraulic cylinder, the connecting block is slidably installed on one side of the airtight door body, a second connecting arm is rotatably installed on the connecting block, a sliding block is installed at one end of the second connecting arm, and a lock head is fixedly installed on one side of the sliding block.

[0008] Preferably, a plurality of slide rails are provided on one side of the airtight door body, the sliding block is slidably mounted on the slide rails, and the second connecting arm is rotatably mounted on one side of the sliding block.

[0009] Preferably, the connecting rods are arranged symmetrically on the slide rails of the same airtight door body.

[0010] Preferably, a plurality of hydraulic cylinders are provided on one side of the airtight door body, a trigger button is provided at one end of the hydraulic cylinder, and a plurality of trigger blocks are provided on one side of the door frame, with the trigger button abutting against the trigger blocks.

[0011] Preferably, a sealing rail is slidably installed on one side of the door frame, and one side of the sealing rail abuts against one side of the airtight door body.

[0012] The beneficial effects of this utility model are: 1. This type of double-leaf linkage self-sealing fixed threshold protective airtight door utilizes a double-leaf linkage opening and closing assembly consisting of a first connecting arm, a limiting post, a limiting plate, and a limiting frame, installed between the two door bodies. This allows the two doors to maintain strictly synchronized movement. The first connecting arm, as the airtight door body rotates, drives the limiting post to move within a sliding groove in the limiting frame, thereby forcing the other door to rotate at the same angle and in the same direction. This structure avoids the problem of traditional double-leaf airtight doors requiring manual opening and closing of the two doors separately, fundamentally solving the drawbacks of asynchronous operation, deflection, and incomplete closing caused by inconsistent human operation in double-leaf airtight doors. Because the entire linkage... The entire process is achieved through pure mechanical motion, eliminating the need for an electrical control system and complex transmission mechanisms. This results in higher reliability and lower maintenance costs. In practical use, operators only need to push either door to open both doors simultaneously. Similarly, when closing, only one door needs to be closed, and the other door automatically closes in place, greatly improving passage efficiency. In confined spaces, scenarios requiring rapid sealing, or frequent opening and closing, this structure can significantly reduce operation time and improve the overall system response speed. At the same time, the linkage structure distributes force evenly, making it less prone to door misalignment, jamming, or seal failure due to uneven force, thus further enhancing the long-term stability of the airtight door.

[0013] 2. This type of double-leaf linkage self-sealing fixed threshold protective airtight door is equipped with several hydraulic cylinders. The hydraulic cylinders are automatically activated by the mechanical pressing action between the trigger button and the trigger block on the door frame. This pushes the connecting rod, sliding block, and lock head into the keyhole to complete the self-locking process. This structure forms a fully automatic sealing process of "closing—triggering—locking," solving the shortcomings of traditional airtight doors that rely on manual latches, knobs, or external power sources for locking. It achieves a truly intelligent self-sealing function. The hydraulic drive method features high thrust, smooth operation, and reliable locking. Its features allow the lock cylinder to be inserted into the keyhole at a stable speed and with sufficient force, preventing improper manual operation from causing the lock cylinder to be out of position or the keyhole to shift. The mating structure between the lock cylinder and the keyhole can form a firm fit under external impact pressure, effectively resisting external forces such as gas shock waves, water pressure, or flue gas backflow, significantly improving the overall compressive strength and security of the door. In addition, the hydraulic cylinder is controlled by a trigger button, and cannot be activated when the door is not fully closed, structurally avoiding potential damage caused by "forced locking before full closure" and improving security.

[0014] 3. This type of double-leaf linkage self-sealing fixed threshold protective airtight door features a sealing barrier at the top of the door frame. The barrier automatically descends via the movement of a limiting frame within a limiting plate, tightly fitting against the sealing strip at the top of the door body to form a secondary seal. The sealing barrier's movement relies entirely on mechanical linkage and gravity drive during door closing, thus offering reliable operation, requiring no energy consumption, and being unaffected by environmental conditions. Traditional airtight doors often have gaps at the top, requiring manual tightening or complex sealing devices to achieve a seal. This structure utilizes the natural fit of the sealing barrier as the limiting frame reaches the end of its travel after door closing, preventing air, smoke, or water leakage. It also automatically adapts to minor installation errors and structural deviations, improving the overall seal's tolerance. Flexible sealing strips or high-temperature resistant rubber strips can be added to the sealing barrier according to project requirements to enhance fit and sealing performance. Because it operates under gravity, there are virtually no wear parts during long-term operation, resulting in extremely low maintenance and easy troubleshooting of abnormalities. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram showing the disassembled structure of the limiting frame, the first connecting arm, and the limiting post of this utility model; Figure 3 This is a schematic diagram of the planar structure of the airtight door body and door frame of this utility model.

[0017] The diagram is marked as follows: 1. Airtight door body; 2. Door frame; 3. Threshold body; 4. Sealing rail; 5. Limiting plate; 6. Limiting frame; 7. First connecting arm; 8. Limiting post; 9. Hydraulic cylinder; 10. Trigger button; 11. Connecting rod; 12. Slide rail; 13. Sliding block; 14. Second connecting arm; 15. Lock head; 16. Lock hole; 17. Sliding groove; 18. Trigger block; 19. Connecting block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] like Figures 1 to 3 As shown, the airtight door in the embodiment includes a door frame 2, a threshold body 3, and two symmetrically arranged airtight door bodies 1. The threshold body 3 is fixed to the bottom of the door frame 2, and its height can be determined according to the actual engineering airtightness level. The preferred height is 80-120mm, which is used to resist external impact pressure and liquid infiltration in the protective environment.

[0021] To achieve synchronous opening and closing of the two airtight door bodies 1, this embodiment provides an opening and closing assembly. The assembly includes a first connecting arm 7 fixed to one side of the airtight door body 1, a limiting plate 5 installed on the side of the door frame 2, and a limiting frame 6 that can slide along the inside of the limiting plate 5. The first connecting arm 7 can be welded from a steel plate with a thickness of 8-12mm, and a limiting post 8 is welded to one end. The diameter of the limiting post 8 is preferably 12-16mm, used to insert into the sliding groove 17 inside the limiting frame 6. The limiting frame 6 is preferably made of thick-walled square steel, with an internal width slightly larger than the diameter of the limiting post 8 by 1- The 2mm sliding groove 17 allows the limiting post 8 to slide smoothly without wobbling. The above structure is symmetrically installed on the two airtight door bodies 1. When either airtight door body 1 is pushed and rotated, the first connecting arm 7 rotates with the door body and drives the limiting post 8 to make a corresponding linear movement in the sliding groove 17. The first connecting arm 7 is also forced to drive the other airtight door body 1 to rotate synchronously, so that the two doors keep opening or closing synchronously. With this structure, the user only needs to push one of the doors to complete the linkage opening and closing operation of the two doors, improving efficiency and reducing misoperation.

[0022] To ensure automatic sealing and locking after the door is closed, this embodiment includes several hydraulic cylinders 9 and corresponding lock heads 15 and lock holes 16. At least one hydraulic cylinder 9 is arranged on the side of each airtight door body 1. The lock head 15 is fixed to the side of the sliding block 13. The extension and retraction of the hydraulic cylinders 9 drives the sliding block 13 to move up and down reciprocally. When the airtight door body 1 is closed to the appropriate position, the trigger block 18 installed on the door frame 2 presses against the trigger button 10 at the front end of the hydraulic cylinder 9. The trigger button 10, under pressure, activates the internal switch, causing the hydraulic cylinder 9 to automatically... As the door retracts, the sliding block 13 moves towards the lock hole 16, allowing the lock head 15 to smoothly insert into the lock hole 16, thus mechanically locking the door. The clearance between the lock head 15 and the lock hole 16 can be controlled within 0.2-0.5mm, resulting in better sealing. This structure utilizes the door's own closing action to trigger automatic locking, eliminating the need for manual operation and significantly improving the reliability and ease of operation of the airtight door. Under external impact pressure, the interlocking structure between the lock head 15 and the lock hole 16 can form strong tensile strength, ensuring a stable seal for the door.

[0023] To further enhance the sealing effect, a sliding sealing bar 4 is installed above the door frame 2. The sealing bar 4 can be made of corrosion-resistant steel plate with a thickness of 5-8mm and moves up and down along the side guide rail of the door frame 2. When the airtight door body 1 is completely closed, the first connecting arm 7 drives the limiting post 8 to continue pushing the limiting frame 6, so that the limiting frame 6 moves to the end of the limiting plate 5. Since the space below the limiting frame 6 no longer supports the sealing bar 4, the sealing bar 4 falls naturally under the action of gravity and abuts tightly against the upper edge of the airtight door body 1. A rubber sealing strip can be installed on the upper surface of the airtight door body 1 so that the sealing bar 4 forms a flexible fit after falling, improving the sealing performance. This structure does not require an additional power source and can complete the automatic sealing of the top by relying on a series of mechanical actions brought about by the closing of the door.

[0024] Summary of the overall operation process: In use, the operator pushes any one of the airtight door bodies 1, and its rotation causes the first connecting arm 7 to move the limiting post 8 within the sliding groove 17, thereby enabling the other door to open in conjunction. When it is necessary to close, only one door needs to be closed, and the other door will automatically close synchronously. When the door leaf is completely pressed against the door frame 2, the trigger block 18 presses down the trigger button 10, causing the hydraulic cylinder 9 to actuate and automatically push the lock head 15 into the lock hole 16, achieving reliable mechanical locking. Subsequently, as the limiting frame 6 moves to the end of the limiting plate 5, the sealing bar 4 falls under the action of gravity and tightly fits against the upper sealing strip of the airtight door body 1, completing the final seal. This overall structure utilizes a triple design of mechanical linkage, hydraulic self-locking, and gravity sealing, enabling the airtight door to achieve an automatic and reliable sealing effect in the absence of power or in complex environments. It has the beneficial effects of simple structure, clear operation, excellent sealing performance, and high safety.

[0025] In this embodiment, the hydraulic cylinder 9 is installed on the side of the airtight door body 1, the cylinder flange is welded and fixed to the door body, the piston rod is connected to the connecting block 19 via the connecting rod 11, and the trigger button 10 is installed on one side of the hydraulic cylinder 9 and aligned with the trigger block 18 on the door frame 2. Two alternative implementation methods are preferred: First, a mechanical push-button hydraulic valve is used. When the door 1 is closed and the trigger block 18 presses down the trigger button 10, the valve core is mechanically pushed, opening the oil circuit. The hydraulic oil directly enters the hydraulic cylinder 9, pushing the sliding block 13 to insert the lock head 15 into the lock hole 16. After the button is released, the valve spring returns to its original position, and the oil circuit is closed. Second, an electronic control method is used. The trigger button 10 is a 22mm industrial instantaneous button, whose contacts are used to control the coil of the solenoid directional valve. When the button 10 is pressed, the solenoid valve is activated, the main oil circuit is switched, and the hydraulic cylinder 9 is activated, thereby achieving locking. After the button is released, the valve resets (see the example of general control of industrial buttons and solenoid valves). For reliability, the hydraulic circuit can be connected in parallel with check valves and relief valves, and mechanical safety locks or stroke confirmation switches can be arranged where necessary to achieve redundant safety protection.

[0026] The working principle of the double-leaf linkage mechanism: The inner sides of the two airtight door bodies 1 are respectively fixed with first connecting arms 7. The limiting post 8 at the end of the first connecting arm 7 is inserted into the sliding groove 17 in the limiting frame 6. When either door is pushed and rotated, the limiting post 8 moves along the sliding groove 17 and pushes the limiting frame 6 to move. At the same time, through the symmetrical connection relationship, it drives the other door to rotate synchronously at the same angle, realizing the synchronous opening and closing of the two doors. This embodiment employs a pre-charged hydraulic system without external power supply, with hydraulic cylinder 9 connected to the pre-charge storage chamber. When trigger block 18 presses down trigger button 10, trigger button 10 activates the hydraulic circuit, causing the hydraulic oil in the storage chamber to drive hydraulic cylinder 9, which in turn drives connecting rod 11, second connecting arm 14, and sliding block 13 to push lock head 15 into lock hole 16 in door frame 2 or sill body 3, achieving automatic locking. Preferably, a one-way valve is installed in the hydraulic circuit to prevent lock head 15 from retracting under external impact, and mechanical wedge locks can be arranged as redundant self-locking devices as needed to improve safety.

[0027] Release structure of top gravity-compensated sealing bar 4: When both door panels are closed and the limit frame 6 moves to the end of its travel, the sealing bar 4 falls under the action of gravity and fits tightly with the sealing strip at the top of the airtight door body 1 to form a top compensation seal, which can automatically adapt to installation errors.

[0028] Overall operation process: Push open any door → Both doors open simultaneously; Close one door → the other door closes simultaneously; The door is fully closed → the trigger block 18 presses down the trigger button 10 → the pre-charged hydraulic unit drives the lock head 15 to insert into the lock hole 16, achieving self-locking; Limit frame 6 reaches the end of the stroke → release sealing bar 4 → sealing bar 4 falls due to gravity to form a top seal.

[0029] This airtight door requires no external power supply. It forms a complete automatic sealing system through mechanical linkage, pre-charged hydraulic drive, and gravity sealing. It is reliable in structure, simple to maintain, and suitable for a variety of protective and airtight scenarios.

[0030] In existing airtight doors for civil defense, the top sealing beam often adopts a mature linkage method of "automatically rising with the opening of the door leaf". This embodiment also adopts a similar structural action relationship. Specifically: when any airtight door body 1 is pushed open, the first connecting arm 7 rotates with the door leaf and drives the limiting post 8 to move in the opening direction within the sliding groove 17. The movement of the limiting post 8 causes the limiting frame 6 to move upward relative to the limiting plate 5. Since there is a fixed guide gap between the upper end of the sealing rail 4 and the limiting plate 5, the upward movement of the limiting frame 6 will cause a relative displacement between the contact position of the lower end of the sealing rail 4 and the limiting frame 6. The lower edge of the sealing rail 4 is pushed up by the limiting frame 6, thereby driving the sealing rail 4 along the door frame. The guide structure of 2 slides upward, realizing the automatic lifting of the top sealing bar 4 during the opening of the door. When the airtight door body 1 closes again, the first connecting arm 7 and the limiting post 8 drive the limiting frame 6 back to its original position. The limiting frame 6 no longer provides support to the lower end of the sealing bar 4. The sealing bar 4 falls naturally along the guide path under its own gravity and fits against the upper edge sealing strip of the airtight door body 1, realizing top compensation sealing in the closed state. This lifting method is a mature structural feature widely used in the civil defense airtight door industry. It does not require an additional power source or additional mechanism. It can automatically complete the rise and fall of the sealing bar 4 by relying only on the movement brought by the opening and closing of the door. The structure is simple, reliable, and easy to process and maintain.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0032] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A double-leaf linkage self-sealing fixed threshold protective airtight door, characterized in that, include: The door frame (2) and the fixed threshold body (3) located at its bottom, wherein two airtight door bodies (1) are symmetrically hinged inside the door frame (2). An opening and closing assembly is installed between the door frame (2) and the threshold body (3), and the opening and closing assembly is used to control the synchronous movement between the two airtight door bodies (1); A sealing assembly is installed on one side of the airtight door body (1). The sealing assembly includes several lock heads (15) movably installed on one side of the airtight door body (1). Several lock holes (16) are provided on the door frame (2) and the threshold body (3). The lock heads (15) and the lock holes (16) are adapted to each other.

2. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 1, characterized in that, A limiting plate (5) is provided on one side of the door frame (2), and a limiting frame (6) is slidably installed in the limiting plate (5). A first connecting arm (7) is fixedly installed on one side of the airtight door body (1), and a limiting post (8) is fixedly installed at one end of the first connecting arm (7). A sliding groove (17) is provided in the limiting frame (6), and the limiting post (8) is slidably installed in the sliding groove (17).

3. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 1, characterized in that, A hydraulic cylinder (9) is provided on one side of the airtight door body (1). A connecting rod (11) is installed at the output end of the hydraulic cylinder (9). A connecting block (19) is installed at the end of the connecting rod (11) away from the hydraulic cylinder (9). The connecting block (19) is slidably installed on one side of the airtight door body (1). A second connecting arm (14) is rotatably installed on the connecting block (19). A sliding block (13) is installed at one end of the second connecting arm (14). A lock head (15) is fixedly installed on one side of the sliding block (13).

4. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 3, characterized in that, The airtight door body (1) has several slide rails (12) on one side, the sliding block (13) is slidably mounted on the slide rail (12), and the second connecting arm (14) is rotatably mounted on one side of the sliding block (13).

5. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 4, characterized in that, The slide rail (12) on the same airtight door body (1) is symmetrically arranged with the connecting rod (11).

6. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 5, characterized in that, The airtight door body (1) is provided with several hydraulic cylinders (9) on one side, and a trigger button (10) is provided at one end of the hydraulic cylinder (9). The door frame (2) is provided with several trigger blocks (18) on one side, and the trigger button (10) abuts against the trigger block (18).

7. The double-leaf linkage self-sealing fixed threshold protective airtight door according to claim 1, characterized in that, A sealing rail (4) is slidably installed on one side of the door frame (2), and one side of the sealing rail (4) abuts against one side of the airtight door body (1).

Images