Protective air-tight door for civil air defense of metro

Abstract

A protective air-tight door for subway civil defense belongs to the related technical field of civil defense equipment and comprises a protective air-tight door body, the protective air-tight door body comprises a door body and a door frame, the door frame is of an inverted U-shaped structure, and the horizontal height of the bottom of the door frame is lower than that of the bottom of the door body; a movable block is horizontally arranged below the bottom of the door body and inside the door frame, a first sliding groove used for the movable block to slide up and down is formed in the bottom of the door body, the movable block is arranged in the first sliding groove in a sliding mode, and a first sealing layer is arranged between the movable block and the first sliding groove. The door body is provided with an adjusting mechanism used for adjusting the position height of the movable block in the first sliding groove. A sealing assembly used for being in sealing connection with the movable block and the door body is arranged on the inner side of the door frame. Sealing among the door body, the door frame and the ground can be achieved without arranging a doorsill, and after the door body is opened, due to the fact that the doorsill is not arranged, personnel and vehicles cannot be affected, and passing of the personnel and the vehicles is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field related to civil air defense equipment, and more specifically, particularly relates to a protective closed door for civil air defense in subways. Background Art

[0002] With the rapid development of economy and science and technology, the development of transportation technology is also getting faster and faster. More and more subways are being built in cities, and civil air defense projects are very important in subway construction. In peacetime, subways are mainly used for transportation operations, and in wartime they play the lifeline role of personnel transfer and important material transportation. Civil air defense doors are an important part of civil air defense projects. Civil air defense doors are installed in various entrance and exit passages, air ducts, transfer stations (including transfer passages) and section tunnels of subway stations.

[0003] The existing protective sealed door itself is very heavy, so there is a gap between the bottom of the protective sealed door and the ground to facilitate pushing the protective sealed door and closing it. However, due to the need for sealing, a threshold is set at the bottom of the protective sealed door (the threshold is set on the ground), or the door frame is designed as a rectangular structure. After the door leaf of the protective sealed door is closed, the threshold can seal the gap between the door and the ground. However, for some places with transportation requirements or people flow, such as wartime personnel entrances and exits and transfer passages, the threshold set by the protective sealed door will cause traffic obstruction due to the frequent entry and exit of people and vehicles. Especially in the case of large flow of people, the threshold set on the ground is not easy to be observed, and it is easy to stumble, thereby increasing the risk of stampede. For vehicle traffic, the threshold will hinder the passage of vehicles, resulting in inconvenience in use. Utility Model Content

[0004] 1. Technical issues:

[0005] In summary, how to solve the problem of easy obstruction of traffic caused by setting thresholds for protective sealed doors in the prior art to meet the sealing requirements has become an urgent problem to be solved by technical personnel in this field.

[0006] (II) Technical solution:

[0007] The utility model aims to provide a protective closed door for civil air defense in subways, which is convenient for closing the door, sealing the gap between the door and the ground, and facilitating the passage of people and vehicles through the protective closed door.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] The utility model provides a protective closed door for civil air defense in subways, including a protective closed door body, wherein the protective closed door body includes a door body and a door frame. In the utility model, the door frame is an inverted U-shaped structure, the horizontal height of the bottom of the door frame is lower than the horizontal height of the bottom of the door body, and is used to form a gap between the door body and the ground; a movable block is horizontally arranged below the bottom of the door body and inside the door frame, a first slide groove for the movable block to slide up and down is opened at the bottom of the door body, the movable block is slidably arranged in the first slide groove, a first sealing layer is arranged between the movable block and the first slide groove, and an adjusting mechanism for adjusting the position height of the movable block in the first slide groove is arranged on the door body; a sealing component for forming a sealed connection with the movable block and the door body is arranged on the inner side of the door frame.

[0010] Preferably, in the subway civil air defense protective closed door provided by the utility model, the first sealing layer is a hollow rectangular structure, and the first sealing layer is sleeved on the movable block; the first sealing layer is made of rubber, the first sealing layer is an integrated structure, or the first sealing layer is formed by gluing multiple sheet units.

[0011] Preferably, in the protective closed door for subway civil air defense provided by the utility model, the sealing assembly includes a slider, a second sealing layer is fixedly sleeved on the slider, and the second sealing layer is made of rubber; a second sliding groove for horizontal sliding of the second sealing layer is provided on the door frame, and the second sliding groove is horizontally symmetrically arranged on both side surfaces of the door frame.

[0012] Preferably, in the protective closed door for subway civil air defense provided by the utility model, bolts for fixing the second sealing layer in the second slide groove are provided on the door frame.

[0013] Preferably, in the subway civil defense protective closed door provided by the utility model, the adjustment mechanism includes a fixed plate horizontally fixed in the first slide groove, a rack is vertically arranged on the top of the movable block, a gear meshing with the rack is arranged in the first slide groove, a rotating assembly for rotating the gear is arranged on the door body, and a first through hole for the rack to pass through is opened on the fixed plate.

[0014] Preferably, in the subway civil airtight protective door provided by the utility model, a guide rod is vertically arranged on the top of the movable block, and a second through hole for the guide rod to pass through is opened on the fixed plate, and the guide rod is slidably matched with the fixed plate through the second through hole to limit the movement of the movable block.

[0015] Preferably, in the subway civil defense protective closed door provided by the utility model, two guide rods are provided, the rack is located in the middle of the length direction of the movable block, and the two guide rods are symmetrically distributed with the rack as the center; or, one guide rod is provided, and the guide rod and the rack are symmetrically distributed with the midpoint in the length direction of the movable block.

[0016] Preferably, in the protective closed door for subway civil defense provided by the utility model, the top end of the guide rod exceeds the second through hole and is provided with a second limit block, the second limit block is used to prevent the top end of the guide rod from detaching from the second through hole, and when the bottom of the second limit block contacts the top of the fixed plate, the bottom of the movable block can extend out of the first slide groove.

[0017] Preferably, in the subway civil airtight protective door provided by the utility model, the guide rod is a rectangular structure, the second through hole is a square hole, a roller is fixedly provided on the inner side wall of the second through hole, and the roller is in rolling contact with the outer side surface of the guide rod.

[0018] Preferably, in the subway civil defense protective closed door provided by the utility model, a first limit plate for limiting the upward movement distance of the guide rod is fixed on the guide rod below the fixed plate, and when the first limit plate contacts the bottom of the fixed plate, the movable block can be retracted into the first slide groove.

[0019] (III) Beneficial effects:

[0020] The utility model provides a protective closed door for civil air defense in a subway. In the utility model, the protective closed door for civil air defense in a subway includes a protective closed door body, and the protective closed door body includes a door body and a door frame. The door frame is an inverted U-shaped structure, and the horizontal height of the bottom of the door frame is lower than the horizontal height of the bottom of the door body, and is used to form a gap between the door body and the ground; a movable block is horizontally arranged below the bottom of the door body and inside the door frame, and a first slide groove for the movable block to slide up and down is opened at the bottom of the door body, and the movable block is slidably arranged in the first slide groove, and a first sealing layer is arranged between the movable block and the first slide groove, and an adjusting mechanism for adjusting the position height of the movable block in the first slide groove is arranged on the door body; a sealing component for forming a sealed connection with the movable block and the door body is arranged on the inner side of the door frame. The utility model provides a first slide groove on the door leaf, and a movable block is provided in the first slide groove. The utility model sets the movable block in the first slide groove and allows it to slide up and down, so that a gap can be left between the door body and the ground, which is convenient for pushing the door body, thereby facilitating the closing of the door body and the door frame. After the door body is closed, the movable block is moved downward in the first slide groove so that the movable block contacts the ground, thereby sealing the gap between the door body and the ground. The gap between the door body and the ground is sealed by the movable block, so that the door body and the ground can be sealed without setting a threshold on the ground. Through the above structural design, the utility model can achieve sealing between the door body, the door frame and the ground without setting a threshold. After the door body is opened, since no threshold is set, it will not affect people and vehicles, which is convenient for people and vehicles to pass. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0022] Figure 1 This is a schematic diagram of the structure of a protective closed door for subway civil air defense in an embodiment of the utility model;

[0023] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 3 for Figure 1 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 4 This is a front view structural diagram of the door body in the embodiment of the utility model;

[0026] Figure 5 This is a diagram showing the usage status of the protective closed door for subway civil air defense in the embodiment of the utility model when it is installed.

[0027] exist Figures 1 to 5 In the figure, the corresponding relationship between the reference numerals and the component names is as follows:

[0028] 1. Door body; 2. Door frame; 3. Fixed plate; 4. Guide rod; 5. Second limit block; 6. Gear;

[0029] 7. movable block; 8. first sealing layer; 9. rack; 10. first limit plate;

[0030] 11. Second sealing layer; 12. Slider; 13. Roller; 14. Bolt; 15. Turntable. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0032] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] Please refer to Figures 1 to 5 ,in, Figure 1 This is a schematic diagram of the structure of a protective closed door for subway civil air defense in an embodiment of the utility model; Figure 2 for Figure 1 A schematic diagram of the enlarged structure at A in the middle; Figure 3 for Figure 1 A schematic diagram of the enlarged structure at B in the middle; Figure 4 This is a front view structural diagram of the door body in the embodiment of the utility model; Figure 5 This is a diagram showing the usage status of the protective closed door for subway civil air defense in the embodiment of the utility model when it is installed.

[0034] The utility model provides a protective closed door for subway civil defense, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the subway civil airtight protective closed door includes a protective closed door body, which includes a door body 1 and a door frame 2. The door body 1 is a single-leaf civil airtight door structure, specifically a steel structure single-leaf civil airtight door. Based on the design concept of the utility model, the utility model can also be used in the wind duct and wind pavilion of the subway station equipment area. When used there, the door body 1 is a clean-type single-leaf protective closed door for air inlet and outlet. When used in the wind duct and wind pavilion, there is no need to set a threshold on the ground, so as to facilitate the passage of personnel and prevent bumps on personnel.

[0035] In the utility model, the door frame 2 is designed as a bottomless structure (that is, the door frame 2 as a whole is an inverted U-shaped structure, and no threshold is set), the door frame 2 includes left and right side frames and an upper sill, and the horizontal height of the bottom of the door frame 2 is lower than the horizontal height of the bottom of the door body 1, that is, the downward extending bottom of the door frame 2 exceeds the bottom of the door body 1. After the door frame 2 is installed, the top of the door body 1 and the upper sill of the door frame 2 can achieve a closed contact, and a gap is left between the bottom of the door body 1 and the ground, so as to facilitate the pushing of the door body 1 and facilitate the opening and closing of the door body 1.

[0036] Located below the door body 1, a movable block 7 is horizontally arranged in the door frame 2 in the same width direction as the door body 1, and a first slide groove is arranged on the bottom surface of the door body 1, and the movable block 7 is slidably arranged in the first slide groove at the bottom of the door body 1. The distance from the bottom of the door frame 2 to the bottom of the door body 1 is less than the thickness of the movable block 7, so that after the bottom of the movable block 7 contacts the ground, the top of the movable block 7 is still located in the first slide groove, which can prevent the movable block 7 from escaping from the first slide groove and causing a gap between the top of the movable block 7 and the bottom of the door body 1, that is, part of the structure of the movable block 7 is always located in the first slide groove of the door body 1, so as to ensure the integrity of the entire door body 1 after closing. A first slide groove for the movable block 7 to slide up and down is opened at the bottom of the door body 1, and a first sealing layer 8 is arranged between the movable block 7 and the first slide groove, and the gap between the movable block 7 and the first slide groove is sealed by the first sealing layer 8, thereby preventing a gap between the side wall of the movable block 7 and the side wall of the first slide groove.

[0037] The first sealing layer 8 is a hollow rectangular structure. The first sealing layer 8 is sleeved on the movable block 7. The first sealing layer 8 is adhered to the movable block 7. The first sealing layer 8 is made of rubber, that is, the first sealing layer 8 is arranged on the front, back, left, right, top and bottom of the movable block 7. The first sealing layer 8 wraps the movable block 7. The first sealing layer 8 arranged on the front, back, left and right sides can seal the side wall of the movable block 7 with the side wall of the first chute (the seal is a sliding seal, that is, the movable block can also maintain the seal when it moves in the first chute), and can prevent the movable block 7 from contacting the first chute, thereby protecting the door body 1 and the movable block 7. The first sealing layer 8 arranged at the bottom of the movable block 7 can seal the gap between the movable block 7 and the ground, because the first sealing layer 8 is made of rubber material, which can make the first sealing layer 8 elastic and have a better sealing effect. The first sealing layer 8 is arranged on the top of the movable block 7, and the first sealing layer 8 is an integrated structure as a whole, so that the first sealing layer 8 on the top of the movable block 7 can play a limiting role, preventing the first sealing layer 8 on the side wall and the bottom from falling off during the upward sliding process of the movable block 7.

[0038] Slide blocks 12 are provided at the bottom of the door body 1 on the left and right sides of the movable block 7. Two slide blocks 12 are provided. A second sealing layer 11 is fixedly sleeved on the slide block 12. The second sealing layer 11 is made of rubber. The second sealing layer 11 is a rectangular structure. The second sealing layer 11 completely wraps the slide block 12. A second slide groove for the second sealing layer 11 (slide block 12) to slide horizontally is provided on the door frame 2. The right side wall of the left door frame and the left side wall of the right door frame are both provided with a second slide groove. Bolts 14 for fixing the second sealing layer 11 in the second slide groove are provided on the door frame 2. The door frame 2 The bottom of the front side walls (or the bottom of the rear side walls) on the left and right sides are provided with threaded holes that threadably cooperate with the screw rod of the bolt 14. The threaded holes are connected to the second slide groove. The screw rod of the bolt 14 passes through the threaded holes and presses on the slider 12, thereby fixing the slider 12 in the second slide groove. By sliding the slider 12 left and right, the sliders 12 on the left and right sides are in contact with the left and right ends of the movable block 7, thereby sealing the gap between the movable block 7 at the bottom of the door body 1 and the door frame 2, and the gap between the door body 1 and the ground is completely sealed by the movable block 7 and the two sliders 12.

[0039] Of course, in some embodiments, the slider 12 can also be fixed to the side wall of the door frame 2, and the length of the slider 12 is consistent with the wall thickness of the first slide groove, so that the length of the slider 12 is shorter, so that the slider 12 is fixed to the edge of the door frame 2, and the slider 12 can also be reduced. The above structural design constitutes a sealing component for sealing the gap between the movable block 7 at the bottom of the door body 1 and the door frame 2.

[0040] A fixed plate 3 is horizontally fixed in the first slide slot, and the fixed plate 3 is at a distance from the top of the first slide slot. A rack 9 is vertically fixed to the top of the movable block 7, and the tooth surface of the rack 9 is perpendicular to the top surface of the movable block 7, and the tooth surface of the rack 9 faces right (of course, it can also be set to the left). A gear 6 meshing with the rack 9 is provided in the first slide slot, and the gear 6 is installed in the first slide slot on the right side of the rack 9. The gear 6 can rotate, and a fixed rod is vertically fixed to the front side surface of the gear 6. A mounting hole for the fixing rod to pass through is opened on the door body 1 on the front side of the first slide slot, and a turntable 15 for facilitating the rotation of the gear 6 is fixed at one end of the fixing rod through the mounting hole. The gear 6 is manually rotated by the turntable 15, and the turntable 15 and the fixing rod constitute a rotating assembly for rotating the gear 6.

[0041] In other embodiments of the present invention, the turntable 15 may also be a "Z"-shaped rocker, or may be designed as an electric drive device.

[0042] The fixed plate 3 is provided with a first through hole for the rack 9 to pass through, and the top end of the rack 9 passes through the first through hole and is located above the fixed plate 3. The rack 9 can be limited by sliding up and down in the first through hole. Of course, in some embodiments, the adjustment mechanism can also include a fixed block, which is vertically fixed on the top of the movable block 7, and a screw is vertically fixed on the front side of the fixed block. A third slide groove for the screw to pass through and slide up and down is provided on the door body 1 in front of the first slide groove. A nut threadedly matched with the screw is provided on the screw. By screwing the nut, the nut is tightly attached to the door body 1, so that the movable block 7 is tightly attached to the first slide groove, and the movable block 7 is fixed in the first slide groove. After the nut is loosened, the screw can slide up and down in the third slide groove, so that the fixed block slides up and down in the first slide groove, so that the movable block 7 slides up and down. The above structural design constitutes an adjustment mechanism for adjusting the height of the movable block 7 in the first slide groove.

[0043] A guide rod 4 is vertically fixed on the top of the movable block 7, and a second through hole is opened on the fixed plate 3 for the top end of the guide rod 4 to pass through. The guide rod 4 slides up and down in the second through hole on the fixed plate 3, thereby limiting the up and down sliding of the movable block 7, preventing the movable block 7 from shifting in the first slide groove, and ensuring that the movable block 7 slides up and down smoothly.

[0044] Preferably, two guide rods 4 are provided, the rack 9 is located in the middle of the length direction of the movable block 7, and the two guide rods 4 are symmetrically distributed with the rack 9 as the center. The two guide rods 4 can play a good limiting role on the movable block 7, and the two guide rods 4 can reduce the contact between the rack 9 and the fixed plate 3. Of course, when there is only one guide rod 4, the guide rod 4 and the rack 9 are symmetrically distributed left and right.

[0045] The top end of the guide rod 4 exceeds the second through hole, and a second limit block 5 is fixed horizontally. The second limit block 5 is used to prevent the top end of the guide rod 4 from escaping from the second through hole. The second through hole is a rectangular structure, and the second limit block 5 is a rectangular plate. The length and width of the second through hole are smaller than the length and width of the second limit block 5, preventing the second limit block 5 from passing through the second through hole. When the bottom of the second limit block 5 contacts the top of the fixed plate 3, the bottom of the movable block 7 exceeds the first slide groove, and the bottom of the movable block 7 contacts the ground. The second limit block 5 can limit the main distance of the guide rod 4 moving downward, which can prevent the top end of the guide rod 4 from escaping from the second through hole, that is, prevent the movable block 7 from escaping from the first slide groove, thereby playing a limiting role.

[0046] The guide rod 4 is a rectangular structure, and the second through hole is a square hole. A roller 13 that rolls up and down on the guide rod 4 is fixed to the inner side wall of the second through hole. Four rollers 13 are provided, and the rollers 13 are directional wheels that roll up and down. Rollers 13 are installed on the left, right, front and back side walls of the second through hole. The rollers 13 can prevent the guide rod 4 from contacting the fixed plate 3, reduce sliding friction between the guide rod 4 and the fixed plate 3, and prevent the guide rod 4 from deviating in the second through hole, so that the movable block 7 can slide up and down more smoothly. The rollers 13 can also reduce the matching accuracy between the guide rod 4 and the second through hole, so that production and assembly are simple.

[0047] A first limit plate 10 is fixed on the guide rod 4 below the fixed plate 3 for limiting the upward movement distance of the guide rod 4. The first limit plate 10 is a rectangular block. A third through hole is opened on the first limit plate 10 for the guide rod 4 to pass through. The side wall of the guide rod 4 is fixed to the third through hole, so that the first limit plate 10 is fixedly sleeved on the guide rod 4. The length and width of the second through hole are smaller than the length and width of the first limit plate 10, preventing the first limit plate 10 from passing through the second through hole. When the first limit plate 10 contacts the bottom of the fixed plate 3, the movable block 7 is located in the first slide groove. When the gear 6 is rotated to make the rack 9 drive the movable block 7 to move upward, the first limit plate 10 on the guide rod 4 will be blocked by the fixed plate 3, thereby limiting the maximum distance of the movable block 7 moving upward, preventing the movable block 7 from moving too far in the first slide groove, thereby playing a limiting role.

[0048] The working principle of the utility model is as follows: when in use, Figure 5 As shown, the door frame 2 and the door body 1 are installed by the existing installation method, and the movable block 7 is located in the first slide groove through the cooperation of the gear 6 and the rack 9, so that there is a gap between the door body 1 and the ground, so that when the door body 1 is pushed, the friction between the bottom of the door body 1 and the ground can be avoided, thereby facilitating the pushing of the door body 1 and facilitating the closing of the door body 1; and after the door body 1 is closed, as shown in FIG. Figure 5As shown, the rack 9 drives the movable block 7 to move downward through the gear 6, so that the movable block 7 and the first sealing layer 8 are in contact with the ground, and the movable block 7 and the first sealing layer 8 seal the gap between the ground and the door body 1, and then the gap between the movable block 7 and the door frame 2 at the bottom of the door body 1 is sealed by the second sealing layer 11 and the slider 12, so as to prevent smoke from flowing between the door body 1 and the ground. Since the gap between the door body 1 and the ground is sealed by the movable block 7, the first sealing layer 8, the second sealing layer 11 and the slider 12, there is no need to set a threshold on the ground, so as to prevent bumps on people and facilitate the passage of people, and there is no protrusion on the ground, so as to facilitate the passage of vehicles.

[0049] As can be seen from the above, the utility model provides a protective closed door for civil air defense in subways, including a protective closed door body, which includes a door body 1 and a door frame 2. Among them, the door frame 2 is an inverted U-shaped structure, and the horizontal height of the bottom of the door frame 2 is lower than the horizontal height of the bottom of the door body 1, and is used to form a gap between the door body and the ground; a movable block 7 is horizontally arranged below the bottom of the door body 1 and inside the door frame 2, and a first slide groove for the movable block 7 to slide up and down is opened at the bottom of the door body 1, and the movable block 7 is slidably arranged in the first slide groove, and a first sealing layer 8 is arranged between the movable block 7 and the first slide groove, and an adjusting mechanism for adjusting the position height of the movable block 7 in the first slide groove is arranged on the door body 1; a sealing component for forming a sealed connection with the movable block 7 and the door body 1 is arranged on the inner side of the door frame 2.

[0050] Through the above structural design, the subway civil airtight protective door provided by the utility model can achieve at least the following beneficial effects compared with the prior art:

[0051] The utility model provides a first slide groove on the door leaf, and a movable block is provided in the first slide groove. The utility model arranges the movable block in the first slide groove and can slide up and down, so that a gap can be left between the door body 1 and the ground, which is convenient for pushing the door body, thereby facilitating the closing of the door body and the door frame. After the door body 1 is closed, the movable block is moved downward in the first slide groove so that the movable block contacts the ground, thereby sealing the gap between the door body and the ground. The gap between the door body and the ground is closed by the movable block, so that there is no need to set a threshold on the ground to achieve sealing between the door body 1 and the ground. This structural design does not require the setting of a threshold, will not affect people and vehicles, and is convenient for people and vehicles to pass.

[0052] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A protective closed door for civil air defense in a subway, comprising a protective closed door body, wherein the protective closed door body comprises a door body (1) and a door frame (2), characterized in that: The door frame (2) is an inverted U-shaped structure, the horizontal height of the bottom of the door frame (2) is lower than the horizontal height of the bottom of the door body (1), and is used to form a gap between the door body and the ground; A movable block (7) is horizontally arranged below the bottom of the door body (1) and inside the door frame (2); a first slide groove for the movable block (7) to slide up and down is opened at the bottom of the door body (1); the movable block (7) is slidably arranged in the first slide groove; a first sealing layer (8) is arranged between the movable block (7) and the first slide groove; and an adjusting mechanism for adjusting the position height of the movable block (7) in the first slide groove is arranged on the door body (1); A sealing component is provided on the inner side of the door frame (2) for forming a sealing connection with the movable block (7) and the door body (1).

2. The protective closed door for subway civil air defense according to claim 1 is characterized in that: The first sealing layer (8) is a hollow rectangular structure, and the first sealing layer (8) is sleeved on the movable block (7); The first sealing layer (8) is made of rubber, the first sealing layer (8) is an integrated structure, or the first sealing layer (8) is formed by gluing a plurality of sheet-like units.

3. The protective closed door for subway civil air defense according to claim 2 is characterized in that: The sealing assembly comprises a slider (12), a second sealing layer (11) is fixedly sleeved on the slider (12), and the second sealing layer (11) is made of rubber; The door frame (2) is provided with a second sliding groove for the horizontal sliding of the second sealing layer (11), and the second sliding groove is horizontally symmetrically arranged on both side surfaces of the door frame (2).

4. The protective closed door for subway civil air defense according to claim 3 is characterized in that: The door frame (2) is provided with bolts (14) for fixing the second sealing layer (11) in the second sliding groove.

5. The protective closed door for subway civil air defense according to claim 1 is characterized in that: The adjustment mechanism comprises a fixed plate (3) fixed horizontally in the first slide groove, a rack (9) is vertically arranged on the top of the movable block (7), a gear (6) meshing with the rack (9) is arranged in the first slide groove, a rotating assembly for rotating the gear (6) is arranged on the door body (1), and a first through hole for the rack (9) to pass through is opened on the fixed plate (3).

6. The protective closed door for subway civil air defense according to claim 5 is characterized in that: A guide rod (4) is vertically arranged on the top of the movable block (7), and a second through hole for the guide rod (4) to pass through is opened on the fixed plate (3). The guide rod (4) is slidably matched with the fixed plate (3) through the second through hole to limit the movement of the movable block (7).

7. The protective closed door for subway civil air defense according to claim 6 is characterized in that: Two guide rods (4) are provided, the rack (9) is located in the middle of the movable block (7) in the length direction, and the two guide rods (4) are symmetrically distributed with the rack (9) as the center; Alternatively, one guide rod (4) is provided, and the guide rod (4) and the rack (9) are symmetrically distributed about the midpoint in the length direction of the movable block (7).

8. The protective closed door for subway civil air defense according to claim 7 is characterized in that: The top end of the guide rod (4) exceeds the second through hole and is provided with a second limit block (5), the second limit block (5) being used to prevent the top end of the guide rod (4) from escaping from the second through hole, and when the bottom of the second limit block (5) contacts the top of the fixed plate (3), the bottom of the movable block (7) can extend out of the first sliding groove.

9. The protective closed door for subway civil air defense according to claim 8, characterized in that: The guide rod (4) is a rectangular structure, the second through hole is a square hole, a roller (13) is fixedly arranged on the inner side wall of the second through hole, and the roller (13) is in rolling contact with the outer side surface of the guide rod (4).

10. The protective closed door for subway civil air defense according to claim 9, characterized in that: Located below the fixed plate (3), a first limit plate (10) is fixed on the guide rod (4) for limiting the upward movement distance of the guide rod (4), and when the first limit plate (10) contacts the bottom of the fixed plate (3), the movable block (7) can be retracted into the first sliding groove.

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