Single-leaf non-threshold steel structure protective sealed door

Abstract

The utility model relates to the technical field of protective door discloses a single -leaf no door sill steel structure protective airtight door, including door frame and door board, the front side right -hand member of door frame is provided with the opening and closing mechanism, the bottom support mechanism is provided with in the front side bottom of door board, the bottom support mechanism is used for supporting the impact that door board bottom resisted, the front side right -hand member of door frame is provided with the lock mechanism, the lock mechanism is used for electric locking and unlocking door board, the inside front end of door frame is provided with the buffer mechanism, the front side of door board is provided with the reinforcing mechanism, the bottom support mechanism includes a plurality of rod swing seat, a plurality of the adjacent rod swing seat all are fixedly connected with the rod pivot. In the utility model, the impact force is absorbed by the hydraulic rod, the force is conducted to the ground through the threaded pivot and the support seat, effectively makes up the support loss of the door frame bottom to the door board bottom without the door sill, effectively avoids the plastic deformation of door board under the violent impact.

Description

Technical Field

[0001] This utility model relates to the field of protective door technology, and in particular to a single-leaf, threshold-free steel structure protective airtight door. Background Technology

[0002] A single-leaf, threshold-free steel structure protective airtight door is a protective facility with a steel structure as its main body. It adopts a single-leaf door panel design, with the door frame flush with the ground and no threshold, facilitating unimpeded passage for personnel and equipment. It combines protection and airtightness functions, using high-strength steel to enhance impact resistance, and combining sealing strips and locking structures to achieve high airtightness. It can resist the threats of explosive shock waves, toxic gases, and dust. It is used in civil defense projects, underground facilities, and industrial protection sites, ensuring space safety in emergencies while taking into account the need for convenient passage and rapid opening and closing.

[0003] A search revealed Chinese patent publication number CN216406608U, which relates to the field of airtight doors for civil defense, disclosing a single-leaf, threshold-free steel structure airtight door for civil defense. In this utility model, an inner door body is provided on the inner surface of the main door body; a door opening is provided inside the mounting door frame; supporting side bodies are fixedly connected to the left and right sides of the mounting door frame; the interior of the supporting side bodies, located on the upper surface of the supporting base plate, is filled with buffer sand; a spring is provided at the center of the upper surface of the supporting base plate; and a connecting plate penetrates the clamping wall of the supporting side bodies. The end of the panel is fixedly connected with a protective rubber pad. Supporting side bodies are set on the left and right sides of the door frame. When the edge of the door frame is impacted, the extrusion steel plate at the top of the supporting side body will compress the buffer block inward. The buffer block slides downward, causing the spring to be compressed and deformed, thereby buffering the vibration and protecting the side of the door frame from being impacted and falling off. This increases the stability of the door frame during installation. However, in actual use, the removal of the threshold leads to insufficient support at the bottom of the door frame, causing plastic deformation under severe impact and failing to effectively protect the door panel. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a single-leaf, threshold-free steel structure protective airtight door, which aims to improve the problem that the elimination of the threshold leads to insufficient support at the bottom of the door frame, resulting in plastic deformation under severe impact and inability to effectively protect the door panel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a single-leaf, threshold-free steel structure protective airtight door, comprising a door frame and a door panel, wherein an opening and closing mechanism is provided at the front right end of the door frame, a bottom support mechanism is provided at the front bottom of the door panel, the bottom support mechanism is used to support the bottom of the door panel to withstand impacts, a locking mechanism is provided at the front right end of the door frame, the locking mechanism is used to electrically lock and unlock the door panel, a buffer mechanism is provided at the inner front end of the door frame, a reinforcement mechanism is provided at the front of the door panel, and a leak-proof mechanism is provided at the bottom of the door panel; The bottom support mechanism includes multiple rod pivots, each of which is fixedly connected to an adjacent rod pivot. Two rod pivots are rotatably connected to the outer walls of their respective outer walls, and two hydraulic rods are rotatably connected to threaded pivots at their bottom ends. Two threaded pivots are threaded to the outer walls of their respective outer walls, and two threaded pivots are threaded to the left ends of their respective left ends. A fixing assembly is provided on the top of the multiple rod pivots.

[0006] The above technical solution achieves the rotational connection between the door panel and the door frame through the opening and closing mechanism, the bottom support mechanism buffers the impact and supports the bottom of the door panel, the locking mechanism realizes electric locking and unlocking, the buffering mechanism reduces the impact of the door panel on the door frame when closing, the reinforcement mechanism enhances the strength of the door panel, and the leak-proof mechanism seals the gap between the door panel and the ground.

[0007] As a further description of the above technical solution: The locking mechanism includes a lock seat, the rear side of which is fixedly connected to the front right end of the door frame. A lock bar is slidably connected to the inner side of the lock seat, a rack is fixedly connected to the top of the lock bar, and a drive assembly is provided on the rear side of the lock bar.

[0008] The above technical solution involves fixing the lock seat to the door frame, allowing the lock bar to slide through an internal groove, with the top rack of the lock bar engaging with the gear of the drive assembly. A motor is placed in the slot to provide power, driving the gear to rotate. Through the meshing of the gear and rack, the lock bar moves back and forth, thus completing the electric locking and unlocking of the door panel.

[0009] As a further description of the above technical solution: The fixing component includes two buckles, the rear sides of which are fixedly connected to the lower front part of the door panel, and the lower front part of the door panel is fixedly connected to two fasteners.

[0010] The above technical solution allows the buckle to be rotatably connected to the door panel at one end, while the other end hooks onto the buckle seat, enabling the bottom support mechanism to be folded up and fixed, facilitating storage and use.

[0011] As a further description of the above technical solution: The drive assembly includes a slot located at the front right end of the door frame. A motor is fixedly connected to the top inner side of the slot, and a gear is fixedly connected to the front side of the motor.

[0012] The above technical solution involves a slot in the door frame to house the motor. The motor drives the gears to rotate, transmitting power and moving the lock bar to lock and unlock the door.

[0013] As a further description of the above technical solution: The buffer mechanism includes a rubber strip, the rear side of which is fixedly connected to the inner front end of the door frame, and multiple elastic rubber particles are fixedly connected to the outer wall of the rubber strip.

[0014] The above technical solution involves fixing the rubber strip to the door frame and using elastic particles on the outer wall to first contact the door panel, providing phased buffering and reducing the impact force of the door panel on the door frame.

[0015] As a further description of the above technical solution: The reinforcement mechanism includes a reinforcement frame, the rear side of which is fixedly connected to the front side of the door panel, and a reinforcement strip is fixedly connected to the middle of the front side of the door frame.

[0016] The above technical solution involves reinforcing the frame around the edge of the door panel and placing the reinforcing strip in the center of the door panel, thereby enhancing the overall strength and impact resistance of the door panel.

[0017] As a further description of the above technical solution: The opening and closing mechanism includes multiple opening and closing seats, and each of the multiple opening and closing seats is rotatably connected to a rotating block.

[0018] The above technical solution involves a rotating groove inside the opening and closing seat, which cooperates with the rotating block shaft to realize the rotation and opening of the door panel relative to the door frame, facilitating door operation.

[0019] As a further description of the above technical solution: The leak-proof mechanism includes an inflatable sealing strip, the top of which is fixedly connected to the bottom of the door panel, and an inflation tube is connected to the top right end of the inflatable sealing strip.

[0020] The above technical solution involves installing an inflatable sealing strip at the bottom of the door panel. The strip is inflated through an inflation tube to fill the gap between the door panel and the ground, thus achieving a seal and preventing leakage.

[0021] This utility model has the following beneficial effects: 1. In this utility model, when the bottom support mechanism is not in use, the hydraulic rod can be fixed to the door panel by the fastener and fastener seat of the fixing component to achieve the retraction. When the door panel is impacted, the hydraulic rod is compressed to absorb the impact force and transmits the force to the ground through the threaded shaft and support seat, thereby enhancing the impact resistance and effectively compensating for the lack of support at the bottom of the door panel by the door frame without a threshold. It provides support force to the bottom of the door frame and the door panel and effectively prevents the door panel from undergoing plastic deformation under severe impact.

[0022] 2. In this utility model, a sliding groove is opened inside the lock seat, and a rack is provided on the top of the lock bar. The slot of the drive component is opened at the front right end of the door frame. The motor at the top inside serves as the power source. When the motor rotates, it drives the gear to rotate. Through the meshing transmission of the gear and the rack, the lock bar is controlled to slide back and forth in the lock seat, realizing the automatic movement of the lock bar and completing the electric locking and unlocking of the door panel. This improves the convenience and automation of operation, ensures the stability of the lock bar movement, and enhances the sealing and protection performance of the door. Attached Figure Description

[0023] Figure 1 A perspective view of a single-leaf, threshold-free steel structure protective airtight door proposed in this utility model; Figure 2 This is a front view of a single-leaf, threshold-free steel structure protective airtight door proposed in this utility model; Figure 3 This is a schematic diagram of the structure of the middle door panel of a single-leaf, threshold-free steel structure protective airtight door proposed in this utility model; Figure 4 This is a split view of the door panel of a single-leaf, threshold-free steel structure protective airtight door proposed in this utility model; Figure 5 This is a schematic diagram of the lock seat in a single-leaf, threshold-free steel structure protective airtight door proposed in this utility model.

[0024] Legend: 1. Door frame; 2. Bottom support mechanism; 201. Rod pivot; 202. Rod shaft; 203. Hydraulic rod; 204. Threaded shaft; 205. Nut; 206. Support seat; 207. Fixing assembly; 2071. Buckle; 2072. Buckle seat; 3. Locking mechanism; 301. Lock seat; 302. Lock bar; 303. Rack; 304. Drive assembly; 3041. Groove; 3042. Motor; 3043. Gear; 4. Door panel; 5. Buffer mechanism; 501. Rubber strip; 502. Elastic rubber granules; 6. Reinforcing mechanism; 601. Reinforcing frame; 602. Reinforcing strip; 7. Opening and closing mechanism; 701. Opening and closing seat; 702. Rotating block; 8. Leak-proof mechanism; 801. Inflatable sealing strip; 802. Inflatable tube. 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 , Figure 3 , Figure 4 and Figure 5 An embodiment of this utility model is provided: a single-leaf thresholdless steel structure protective airtight door, including a door frame 1 and a door panel 4. An opening and closing mechanism 7 is provided at the front right end of the door frame 1, and a bottom support mechanism 2 is provided at the front bottom of the door panel 4. The bottom support mechanism 2 is used to support the bottom of the door panel 4 to resist the impact. A locking mechanism 3 is provided at the front right end of the door frame 1. The locking mechanism 3 is used to electrically lock and unlock the door panel 4. A buffer mechanism 5 is provided at the inner front end of the door frame 1, a reinforcing mechanism 6 is provided at the front of the door panel 4, and a leak-proof mechanism 8 is provided at the bottom of the door panel 4. The bottom support mechanism 2 includes multiple rod pivots 201. Each of the multiple rod pivots 201 is fixedly connected to a rod pivot 202. The outer walls of two rod pivots 202 are rotatably connected to hydraulic rods 203. The bottom ends of two hydraulic rods 203 are rotatably connected to threaded pivots 204. The outer walls of two threaded pivots 204 are threadedly connected to support seats 206. The left ends of two threaded pivots 204 are threadedly connected to nuts 205. A fixing component 207 is provided on the top of the multiple rod pivots 201. Specifically, an opening and closing mechanism 7 is provided at the front right end of the door frame 1. The opening and closing mechanism 7 is used for rotation between the door panel 4 and the door frame 1. A bottom support mechanism 2 is provided at the front bottom of the door panel 4. The bottom support mechanism 2 is used to support the bottom of the door panel 4 to withstand impacts. A locking mechanism 3 is provided at the front right end of the door frame 1. The locking mechanism 3 is used for electrically locking and unlocking the door panel 4. A buffer mechanism 5 is provided at the inner front end of the door frame 1. The buffer mechanism 5 is used to buffer the impact of the door panel 4 on the door frame 1. A reinforcement mechanism is provided at the front of the door panel 4. Structure 6, the reinforcing mechanism 6 is used to reinforce the door panel 4. The bottom of the door panel 4 is provided with a leak-proof mechanism 8, which is used to seal the gap between the door panel 4 and the ground. The bottom support mechanism 2 includes multiple rod pivots 201, which connect the door panel 4 and the hydraulic rod 203. Each of the multiple rod pivots 201 is fixedly connected to a rod shaft 202. The rod shaft 202 causes the hydraulic rod 203 to rotate within a range. The outer walls of two rod shafts 202 are rotatably connected to the hydraulic rod 203. The hydraulic rod 203 is shortened under force. When the door panel 4 is subjected to a strong impact, it extends back to its original length. The impact force is transmitted to the ground behind the support 206. The bottom ends of both hydraulic rods 203 are rotatably connected to threaded shafts 204. The ends of the threaded shafts 204 are threaded, while the middle is smooth. Supports 206 are threaded to the outer walls of both threaded shafts 204. The support 206 is fixed to the ground and can be disassembled when not in use. Nuts 205 are threaded to the left ends of both threaded shafts 204, securing the threaded shafts 204. The top of the rod swivel seat 201 is provided with a fixing component 207. The fixing component 207 is used to fix the bottom support mechanism 2 and can be retracted when not in use. The fixing component 207 includes two buckles 2071. One end of the buckle 2071 can rotate on the door panel 4. The rear side of both buckles 2071 is fixedly connected to the lower middle part of the front side of the door panel 4. Two fasteners 2072 are fixedly connected to the lower middle part of the front side of the door panel 4. When the fasteners 2072 are fastened by the other end of the buckle 2071, the hydraulic rod 203 can be fixed on the door panel 4.

[0027] Reference Figure 5 The locking mechanism 3 includes a lock seat 301, the rear side of which is fixedly connected to the front right end of the door frame 1. A lock bar 302 is slidably connected to the inner side of the lock seat 301. A rack 303 is fixedly connected to the top of the lock bar 302. A drive assembly 304 is provided on the rear side of the lock bar 302. Specifically, the lock base 301 has a sliding groove inside. The rear side of the lock base 301 is fixedly connected to the front right end of the door frame 1. A lock bar 302 is slidably connected to the inner side of the lock base 301. The lock bar 302 slides within the lock base 301. A rack 303 is fixedly connected to the top of the lock bar 302. The rack 303 is used to move the lock bar 302. A drive assembly 304 is provided on the rear side of the lock bar 302. The drive assembly 304 is used to provide power for the movement of the lock bar 302. 4 includes a slot 3041, which provides a position for the drive assembly 304. The slot 3041 is located at the front right end of the door frame 1. A motor 3042 is fixedly connected to the top of the inner side of the slot 3041. The motor 3042 is the source of driving force. A gear 3043 is fixedly connected to the front side of the motor 3042. When the motor 3042 rotates, it drives the gear 3043 to rotate. The gear 3043 meshes with the rack 303, thereby controlling the lock bar 302 to move back and forth.

[0028] Reference Figure 3 , Figure 4 and Figure 5 The fixing component 207 includes two buckles 2071, the rear sides of which are fixedly connected to the lower middle part of the front side of the door panel 4. Two buckle seats 2072 are fixedly connected to the lower middle part of the front side of the door panel 4. The driving component 304 includes a slot 3041, which is opened at the right end of the front side of the door frame 1. A motor 3042 is fixedly connected to the top of the inner side of the slot 3041. A gear 3043 is fixedly connected to the front side of the motor 3042. The buffer mechanism 5 includes a rubber strip 501, the rear side of which is fixedly connected to the front end of the inner side of the door frame 1. A plurality of elastic rubber particles 502 are fixedly connected to the outer wall of the rubber strip 501. Specifically, one end of the buckle 2071 is rotatably connected to the door panel 4, and the other end has a rotatable ring that can hook onto the buckle seat 2072. The rear sides of both buckles 2071 are fixedly connected to the lower-middle front part of the door panel 4. Two buckle seats 2072 are fixedly connected to the lower-middle front part of the door panel 4. The drive assembly 304 includes a slot 3041, which is large enough to accommodate a motor 3042. The slot 3041 is located at the right front end of the door frame 1, and an electric motor is fixedly connected to the top inner side of the slot 3041. The motor 3042 drives the gear 3043 to rotate. The gear 3043 is fixedly connected to the front side of the motor 3042 and is used to transmit power. The buffer mechanism 5 includes a rubber strip 501, which is fixed to the door frame 1. The rear side of the rubber strip 501 is fixedly connected to the inner front end of the door frame 1. Multiple elastic rubber particles 502 are fixedly connected to the outer wall of the rubber strip 501. The elastic rubber particles 502 contact the door panel 4 before the rubber strip 501, so as to achieve front and rear buffering of the impact force.

[0029] Reference Figure 2 , Figure 3 and Figure 5 The reinforcement mechanism 6 includes a reinforcement frame 601, the rear side of which is fixedly connected to the front side of the door panel 4. A reinforcement strip 602 is fixedly connected to the middle of the front side of the door frame 1. The opening and closing mechanism 7 includes multiple opening and closing seats 701, and a rotating block 702 is rotatably connected between adjacent opening and closing seats 701. The leak-proof mechanism 8 includes an inflatable sealing strip 801, the top of which is fixedly connected to the bottom of the door panel 4. An inflation tube 802 is connected to the top right end of the inflatable sealing strip 801. Specifically, the reinforcing frame 601 fits around the outer edge of the door panel 4, reinforcing the edge's firmness. The rear side of the reinforcing frame 601 is fixedly connected to the front side of the door panel 4. A slot is provided on the right side of the reinforcing frame 601, allowing the door panel 4 to be locked when the lock bar 302 is inserted. A reinforcing bar 602 is fixedly connected to the center of the front side of the door frame 1, reinforcing the center of the door panel 4. The opening and closing mechanism 7 includes multiple opening and closing seats 701, each with a rotating groove on its inner side. Rotating blocks 702 are rotatably connected to each other of 701. Rotating blocks 702 are equipped with rotating shafts. The leak-proof mechanism 8 includes an inflatable sealing strip 801. When the door panel 4 is closed, the inflatable sealing strip 801 inflates and fills the gap between the door panel 4 and the ground. The top of the inflatable sealing strip 801 is fixedly connected to the bottom of the door panel 4. The top right end of the inflatable sealing strip 801 is connected to an inflation pipe 802. The inflation pipe 802 is used to connect to an external air pump to inflate the inflatable sealing strip 801.

[0030] Working principle: The door panel 4 is connected and installed to the door frame 1 through the opening and closing mechanism 7. In the opening and closing mechanism 7, multiple opening and closing seats 701 are rotatably connected to a rotating block 702. The rotating shaft on the rotating block 702 cooperates with the door panel 4, allowing the door panel 4 to rotate around it, thereby realizing the opening and closing action of the door panel 4 relative to the door frame 1. After the door panel 4 is installed, the bottom support mechanism 2 is operated to release the buckle 2071 of the fixing component 207 from the buckle seat 2072, allowing the hydraulic rod 203 to be lowered. Multiple rod rotating seats 201 are fixed to the bottom of the door panel 4, and the rod rotating seats 201 are connected by rod rotating shafts. 202 connects to the hydraulic rod 203, allowing adjustment of the rotation angle of the hydraulic rod 203. The threaded shaft 204 at the bottom of the hydraulic rod 203 is screwed into the support seat 206, which is fixed to the ground. Nut 205 tightens the threaded shaft 204. When the door panel 4 is impacted, the hydraulic rod 203 shortens under force, transmitting the impact force to the ground behind the support seat 206. When no force is applied, it extends back, buffering and supporting the bottom of the door panel 4 and resisting impact. Then, the door panel 4 is locked by activating the drive assembly 304 of the locking mechanism 3. The right front end of the door frame 1... The motor 3042 inside the slot 3041 starts working, driving the gear 3043 to rotate. The gear 3043 meshes with the rack 303 at the top of the lock bar 302, driving the lock bar 302 to slide within the lock seat 301, so that the lock bar 302 is inserted into the slot on the right side of the door panel 4 reinforcement frame 601, realizing the electric locking of the door panel 4. During the closing process of the door panel 4, the buffer mechanism 5 at the inner front end of the door frame 1 plays a role. The rubber strip 501 is fixed to the inner front end of the door frame 1, and the elastic rubber particles 502 on the outer wall first contact the door panel 4, and then the rubber strip 501 further buffers the door panel 4. To reduce the impact on the door frame 1 when the door panel 4 is closed, an external air pump is connected through the air inflator pipe 802 to inflate the air-sealing strip 801 of the anti-leakage mechanism 8. The air-sealing strip 801 is installed at the bottom of the door panel 4. After inflation, it expands and fills the gap between the door panel 4 and the ground to achieve a sealing effect and prevent external gas, liquid or debris from entering. The reinforcing frame 601 on the front side of the door panel 4 and the reinforcing strip 602 in the middle of the front side of the door frame 1 reinforce the edges and center of the door panel 4 respectively, improve the overall structural strength, and ensure that the protective airtight door can effectively resist external impacts when closed.

[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. A single-leaf, thresholdless steel structure protective airtight door, comprising a door frame (1) and a door panel (4), characterized in that: The door frame (1) is provided with an opening and closing mechanism (7) on the front right side, and the door panel (4) is provided with a bottom support mechanism (2) on the front bottom side. The bottom support mechanism (2) is used to support the bottom of the door panel (4) to resist the impact. The door frame (1) is provided with a locking mechanism (3) on the front right side. The locking mechanism (3) is used to electrically lock and unlock the door panel (4). The door frame (1) is provided with a buffer mechanism (5) on the inner front end, and the door panel (4) is provided with a reinforcement mechanism (6) on the front side. The door panel (4) is provided with a leak-proof mechanism (8) at the bottom. The bottom support mechanism (2) includes multiple rod swivels (201), each of the multiple rod swivels (201) is fixedly connected to a rod shaft (202), the outer walls of two rod shafts (202) are rotatably connected to hydraulic rods (203), the bottom ends of two hydraulic rods (203) are rotatably connected to threaded shafts (204), the outer walls of two threaded shafts (204) are threadedly connected to support seats (206), the left ends of two threaded shafts (204) are threadedly connected to nuts (205), and the top of the multiple rod swivels (201) is provided with a fixing component (207).

2. The single-leaf thresholdless steel structure protective airtight door according to claim 1, characterized in that: The locking mechanism (3) includes a lock seat (301), the rear side of which is fixedly connected to the front right end of the door frame (1), a lock bar (302) is slidably connected to the inner side of the lock seat (301), a rack (303) is fixedly connected to the top of the lock bar (302), and a drive assembly (304) is provided on the rear side of the lock bar (302).

3. A single-leaf, thresholdless steel structure protective airtight door according to claim 1, characterized in that: The fixing component (207) includes two buckles (2071), the rear sides of which are fixedly connected to the lower front part of the door panel (4), and the lower front part of the door panel (4) is fixedly connected to two fasteners (2072).

4. A single-leaf, threshold-free steel structure protective airtight door according to claim 2, characterized in that: The drive assembly (304) includes a slot (3041) which is located at the front right end of the door frame (1). A motor (3042) is fixedly connected to the top of the inner side of the slot (3041), and a gear (3043) is fixedly connected to the front side of the motor (3042).

5. A single-leaf, thresholdless steel structure protective airtight door according to claim 1, characterized in that: The buffer mechanism (5) includes a rubber strip (501), the rear side of which is fixedly connected to the inner front end of the door frame (1), and a plurality of elastic rubber particles (502) are fixedly connected to the outer wall of the rubber strip (501).

6. A single-leaf, thresholdless steel structure protective airtight door according to claim 1, characterized in that: The reinforcement mechanism (6) includes a reinforcement frame (601), the rear side of which is fixedly connected to the front side of the door panel (4), and a reinforcement strip (602) is fixedly connected to the middle of the front side of the door frame (1).

7. A single-leaf, thresholdless steel structure protective airtight door according to claim 1, characterized in that: The opening and closing mechanism (7) includes multiple opening and closing seats (701), and each of the multiple opening and closing seats (701) is rotatably connected to a rotating block (702).

8. A single-leaf, threshold-free steel structure protective airtight door according to claim 1, characterized in that: The leak-proof mechanism (8) includes an inflatable sealing strip (801), the top of which is fixedly connected to the bottom of the door panel (4), and the right end of the top of the inflatable sealing strip (801) is connected to an inflation tube (802).

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