Steel structure civil air defense airtight door

Abstract

The utility model relates to the technical field of civil air defence door, and disclose a kind of steel structure civil air defence airtight door, including door frame, the outer wall of door frame is provided with door panel, the side wall of door frame is provided with hinge, by rotating the hand wheel of door panel outer wall drive coaxial fixed worm synchronous rotation, drive worm wheel and rigid connection screw rod rotation meshed with worm, in this process, screw rod utilizes the positive direction of two ends, reverse thread, will rotary motion be converted into the reverse sliding of two groups of guide blocks along guide groove, make its two groups of guide blocks pass through first connecting rod and pull second connecting rod steering, further drive pivot and baulk synchronous swing, the inclined plane of baulk bottom is attached to sealing strip and applies positive pressure, force sealing strip to the elastic deformation in the direction of door frame, still can pass through the repulsion of same pole of magnetic block inlayed in baulk and sealing strip inner magnetic plate and enhance pressurization effect, avoid sealing strip uneven force locally leading to leakage pressure, to further improve the convenience of sealing operation and the reliability of sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of civil defense door technology, specifically a steel structure civil defense airtight door. Background Technology

[0002] Steel structure airtight doors are the lifeline of civil defense projects. As core protective equipment against wartime shock waves, nuclear radiation, toxic vapors, biological warfare agents, and disasters such as fires and floods, their performance is directly related to the safety of personnel and the integrity of the project in underground protected spaces. They are widely used in various peacetime and wartime combined civil defense facilities such as subways, underground shopping malls, civil defense command centers, and medical rescue projects.

[0003] Existing air-raid shelter doors typically use a single sealing strip for sealing. The sealing effect relies entirely on the elastic deformation of the sealing strip and the closing pressure of the door. This results in insufficient and uneven sealing pressure, with pressure concentrated in the center of the door panel. The corners and edges are prone to sealing blind spots due to inadequate compression. This is especially problematic in air-raid shelter projects that need to block high-pressure or highly permeable media such as shock waves and toxic vapors, potentially leading to pressure leakage in the sealing structure. Therefore, we propose a steel structure airtight air-raid shelter door. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a steel structure airtight door for civil defense, which has the advantages of enhanced sealing effect and door panel opening and closing buffer, thus solving the problems mentioned in the background technology.

[0005] This utility model provides the following technical solution: a steel structure airtight door for civil defense, including a door frame, a door panel on the outer wall of the door frame, a hinge on the side wall of the door frame, a sealing strip fixedly mounted on the outer wall of the door panel, a magnetic plate embedded in the inner wall of the sealing strip, a guide rod fixedly installed on the inner wall of the door panel, a guide groove opened on the outer wall of the guide rod, a sealing assembly in the inner cavity of the door panel, and a buffer protection assembly on the side wall of the door panel.

[0006] As a preferred technical solution of this utility model: there are three hinges, and the three hinges are arranged in parallel. One end of each of the three hinges is connected and fixed to the side wall of the door frame, and the other end is connected and fixed to the side wall of the door panel.

[0007] As a preferred technical solution of this utility model: the sealing assembly includes a handwheel disposed on the outer wall of the door panel, a worm gear fixedly sleeved on the inner wall of the handwheel, a threaded rod disposed in the inner cavity of the door panel, a worm wheel fixedly sleeved on the outer wall of the threaded rod, a guide block threadedly connected to the outer wall of the worm wheel, one end of a first connecting rod rotatably connected to the bottom of the guide block, one end of a second connecting rod rotatably connected to the other end of the first connecting rod, a rotating shaft fixedly sleeved on the inner wall of the other end of the second connecting rod, a pressure block fixedly sleeved on the outer wall of the rotating shaft, and a magnetic block embedded in the inner wall of the pressure block.

[0008] As a preferred technical solution of this utility model: the outer helix of the worm gear and the outer teeth of the worm wheel are interlocked and meshed; one end of the threaded rod has a forward thread and the other end has a reverse thread; the guide rod, guide groove, and guide block are considered as a set of movable components, and there are two sets of such movable components, which are symmetrically arranged with the worm wheel as the center; the outer walls of the two guide blocks are slidably fitted to the inner walls of the guide grooves; the first connecting rod, second connecting rod, rotating shaft, pressure block, and magnetic block are considered as a set of movable components, and there are four sets of such movable components, which are arranged in a rectangular array; the bottom cross-section of the four pressure blocks is inclined, and the inclined surface is slidably fitted to the outer wall of the sealing strip; the bottom of the four magnetic blocks and the un-embedded side of the magnetic plate are the S poles, and they are magnetically repelled.

[0009] As a preferred technical solution of this utility model: the buffer protection component includes a box body fixedly installed on the inner wall of the door panel, a rubber pad provided on the outer wall of the box body, a central column fixedly installed on the inner wall of the box body, a spring provided on the outer wall of the central column, a slider provided on the outer wall of the central column, a third connecting rod provided on the outer wall of the slider, and an installation block fixedly installed on the bottom of the rubber pad.

[0010] As a preferred technical solution of this utility model: the buffer protection component is regarded as a set of movable components, and there are two sets of movable components, which are respectively set on the upper and lower ends of the side wall of the door panel. The central column, spring, slider and third connecting rod are regarded as a set of movable components, and there are two sets of movable components, which are respectively symmetrically arranged with the mounting block as the center. One end of the two springs overlaps with the inner wall of the box and the other end overlaps with the side wall of the two sliders. The inner wall of the two sliders is in contact with the outer wall of the central column and slides. One end of the two third connecting rods is rotatably connected to the top of the two sliders and the other end is rotatably connected to the bottom of the mounting block. The outer wall of the rubber pad is in contact with the inner wall of the box and slides.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. This steel-structured airtight door for civil defense uses a handwheel on the outer wall of the door panel to drive a coaxially fixed worm gear to rotate synchronously. This drives the worm wheel meshing with the worm gear and the rigidly connected threaded rod to rotate. During this process, the threaded rod uses the forward and reverse threads at both ends to convert the rotational motion into two sets of guide blocks sliding in opposite directions along the guide groove. The two sets of guide blocks pull the second link through the first link to turn, thereby driving the rotating shaft and pressure block to swing synchronously. The inclined surface at the bottom of the pressure block adheres to the sealing strip and applies positive pressure, forcing the sealing strip to elastically deform towards the door frame. The repulsive force between the like poles of the magnetic block embedded in the pressure block and the magnetic plate inside the sealing strip can also enhance the pressurization effect, avoiding uneven local stress on the sealing strip that could lead to pressure leakage. This further improves the convenience of the sealing operation and the reliability of the sealing effect.

[0012] 2. This steel-structured airtight door for civil defense uses the contact between the door panel and the wall during opening and closing to drive the rubber pad to make flexible contact first. The rubber pad initially buffers the impact energy through its own elastic deformation. During this process, the rubber pad transmits the remaining impact force to the third connecting rod on both sides through the mounting block. This causes the two sets of sliders to slide in opposite directions along the central column and compress the spring. The remaining energy is then absorbed through the elastic extension and contraction of the spring. This process can protect against shock waves during opening and closing collisions, further improving the door's impact resistance and the service life of its core components. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the buffer protection component structure of this utility model; Figure 3 This is a schematic diagram of the sealed transmission structure of this utility model; Figure 4 This is a schematic diagram of the pressing block structure of this utility model; Figure 5 This utility model Figure 2 Enlarged structural diagram at point A in the middle; Figure 6 This utility model Figure 4 Enlarged structural diagram at point B.

[0014] In the diagram: 1. Door frame; 2. Door panel; 3. Hinge; 4. Sealing strip; 5. Magnetic plate; 6. Guide rod; 7. Guide groove; 8. Sealing assembly; 9. Buffer protection assembly; 801. Handwheel; 802. Worm gear; 803. Threaded rod; 804. Worm wheel; 805. Guide block; 806. First connecting rod; 807. Second connecting rod; 808. Rotating shaft; 809. Pressure block; 810. Magnetic block; 901. Box body; 902. Rubber pad; 903. Central column; 904. Spring; 905. Slider; 906. Third connecting rod; 907. Mounting block. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 - Figure 6 A steel structure airtight door for civil defense includes a door frame 1, a door panel 2 on the outer wall of the door frame 1, a hinge 3 on the side wall of the door frame 1, a sealing strip 4 fixedly mounted on the outer wall of the door panel 2, a magnetic plate 5 embedded in the inner wall of the sealing strip 4, a guide rod 6 fixedly installed on the inner wall of the door panel 2, a guide groove 7 opened on the outer wall of the guide rod 6, a sealing component 8 in the inner cavity of the door panel 2, and a buffer protection component 9 on the side wall of the door panel 2. In the above structure, the door frame 1, door panel 2 and hinge 3 form the basic opening and closing frame of the door. At the same time, the hinge 3 enables the door panel 2 to rotate flexibly relative to the door frame 1, providing support for the conversion of the door and daily passage. Meanwhile, the magnetic plate 5 embedded in the inner wall of the sealing strip 4 on the outer wall of the door panel 2 can enhance the sealing fit, and the sealing component 8 in the inner cavity of the door panel 2 improves the sealing effect.

[0017] In a preferred embodiment: there are three hinges 3, and the three hinges 3 are arranged in parallel. One end of each of the three hinges 3 is connected and fixed to the side wall of the door frame 1, and the other end is connected and fixed to the side wall of the door panel 2. In the above structure, the upper and lower areas and the middle area of ​​the door frame 1 and the door panel 2 are connected and fixed by three parallel hinges 3 respectively, forming a three-point balanced support. The three parallel support points can evenly distribute the self-weight of the door panel 2 and the shock wave load to multiple anchoring positions of the door frame 1. The parallel hinge axis ensures that the door panel 2 always rotates along the preset trajectory during the opening and closing process, thereby preventing the sealing strip 4 from misaligning and rubbing against the door frame 1 due to support offset, thus extending the service life of the sealing strip 4.

[0018] In a preferred embodiment: the sealing assembly 8 includes a handwheel 801 disposed on the outer wall of the door panel 2, a worm gear 802 fixedly sleeved on the inner wall of the handwheel 801, a threaded rod 803 disposed in the inner cavity of the door panel 2, a worm wheel 804 fixedly sleeved on the outer wall of the threaded rod 803, a guide block 805 threadedly connected to the outer wall of the worm wheel 804, a first connecting rod 806 rotatably connected to the bottom of the guide block 805, a second connecting rod 807 rotatably connected to the other end of the first connecting rod 806, a rotating shaft 808 fixedly sleeved on the inner wall of the other end of the second connecting rod 807, a pressure block 809 fixedly sleeved on the outer wall of the rotating shaft 808, and a magnetic block 810 embedded in the inner wall of the pressure block 809; In a preferred embodiment: the outer helix of the worm 802 and the outer teeth of the worm wheel 804 are interlocked and meshed; one end of the threaded rod 803 is constructed with a forward thread and the other end is constructed with a reverse thread; the guide rod 6, the guide groove 7 and the guide block 805 are considered as a set of movable components, and there are two sets of such movable components, which are symmetrically arranged with the worm wheel 804 as the center; the outer walls of the two guide blocks 805 are in contact with the inner wall of the guide groove 7 and slide together; the first connecting rod 806, the second connecting rod 807, the rotating shaft 808, the pressure block 809 and the magnetic block 810 are considered as a set of movable components, and there are four sets of such movable components, which are arranged in a rectangular array; the bottom cross-section of the four pressure blocks 809 is inclined, and the inclined surface is in contact with the outer wall of the sealing strip 4 and slides together; the bottom of the four magnetic blocks 810 and the un-embedded side of the magnetic plate 5 are the S poles, and they are magnetically repelled. In the above structure, by rotating the handwheel 801 on the outer wall of the door panel 2, the handwheel 801 drives the coaxially fixed worm 802 to rotate synchronously. Because the outer spiral edge of the worm 802 meshes with the outer teeth of the worm wheel 804, the rotating worm 802 synchronously drives the worm wheel 804 to rotate. The rotation of the worm wheel 804 also drives the threaded rod 803 to rotate synchronously. Since one end of the threaded rod 803 has a forward thread and the other end has a reverse thread, and it cooperates with two sets of symmetrical guide rods 6, guide grooves 7, and guide blocks 805, the two guide blocks 805 driven by the threaded rod 803 slide along the inner wall of the guide groove 7, moving in opposite directions or back-to-back. The bottom of the two sets of guide blocks 805 are connected to the first connecting rod 806 via a pin, and the other end of the first connecting rod 806 is hinged to the second connecting rod 807. 7 are rigidly connected to the rotating shaft 808 in the middle of the pressure block 809. When the guide block 805 slides, it pulls one end of the first connecting rod 806, which in turn pulls the second connecting rod 807 to rotate. The second connecting rod 807 drives the rotating shaft 808 to rotate, causing the pressure block 809, which is fixedly sleeved on the outer wall of the rotating shaft 808, to rotate as well. The inclined surface at the bottom of the pressure block 809 is in contact with the outer wall of the sealing strip 4. During the swing of the pressure block 809, it applies a continuously increasing positive pressure to the sealing strip 4, thereby forcing the sealing strip 4 to elastically deform towards the door frame 1. During this process, the magnetic block 810 embedded in the pressure block 809 and the magnetic plate 5 in the sealing strip 4 generate additional repulsive force due to the repulsion of like poles. This makes the four sets of pressure blocks 809 arranged in a rectangular array, ensuring that the four corners and the middle of the sealing strip 4 are evenly stressed, thereby improving the sealing effect of the sealing strip 4.

[0019] In a preferred embodiment: the buffer protection component 9 includes a box 901 fixedly installed on the inner wall of the door panel 2, a rubber pad 902 provided on the outer wall of the box 901, a central column 903 fixedly installed on the inner wall of the box 901, a spring 904 provided on the outer wall of the central column 903, a slider 905 provided on the outer wall of the central column 903, a third connecting rod 906 provided on the outer wall of the slider 905, and an installation block 907 fixedly installed on the bottom of the rubber pad 902; In a preferred embodiment: the buffer protection component 9 is considered as a set of movable components, and there are two sets of such movable components, which are respectively set at the upper and lower ends of the side wall of the door panel 2. The central column 903, spring 904, slider 905 and third connecting rod 906 are considered as a set of movable components, and there are two sets of such movable components, which are respectively symmetrically arranged with the mounting block 907 as the center. One end of the two springs 904 overlaps with the inner wall of the box 901, and the other end overlaps with the side wall of the two sliders 905. The inner wall of the two sliders 905 is in contact with the outer wall of the central column 903 and slides. One end of the two third connecting rods 906 is rotatably connected to the top of the two sliders 905, and the other end is rotatably connected to the bottom of the mounting block 907. The outer wall of the rubber pad 902 is in contact with the inner wall of the box 901 and slides. In the above structure, when the door panel 2 is opened and closed, the rubber pad 902 on the side wall of the door panel 2 makes flexible contact with the wall first when the door panel 2 contacts the wall. The rubber pad 902 uses its own elastic deformation to initially buffer the impact. At the same time, its outer wall slides tightly against the inner wall of the box 901. The remaining impact force generated by the collision is synchronously transmitted to the third connecting rods 906 on both sides through the mounting block 907 at the bottom of the rubber pad 902. The third connecting rods 906 will correspondingly push two sets of sliding rods symmetrically distributed around the mounting block 907. Block 905 slides in the opposite direction along the central column 903, causing the slider 905 to simultaneously press the springs 904 that overlap with the inner wall of the box 901 at both ends during the sliding process. This allows the springs 904 to further absorb the remaining impact energy through elastic expansion and contraction. The linkage structure between the symmetrical slider 905 and the springs 904 evenly distributes the concentrated impact force to the entire area of ​​the box 901, thereby avoiding the tilting and displacement of the door panel 2 caused by unilateral force. Ultimately, this effectively weakens the vibration and impact generated by the opening and closing collision of the door panel 2, thus preventing the hinge 3 from becoming loose due to repeated impacts.

[0020] Working principle: First, the operator rotates the handwheel 801 on the outer wall of the door panel 2, causing the handwheel 801 to drive the coaxially fixed worm 802 to rotate synchronously. Because the outer helix of the worm 802 meshes with the outer teeth of the worm wheel 804, the rotating worm 802 synchronously drives the worm wheel 804 to rotate. The rotation of the worm wheel 804 also drives the threaded rod 803 to rotate synchronously. Since one end of the threaded rod 803 has a forward thread and the other end has a reverse thread, and it cooperates with two sets of symmetrical guide rods 6, guide grooves 7, and guide blocks 805, the two guide blocks 805 driven by the threaded rod 803 slide along the inner wall of the guide groove 7, moving in opposite directions or back-to-back. The bottom of the two sets of guide blocks 805 are connected to the first connecting rod 806 via a pin, and the other end of the first connecting rod 806 is hinged to the second connecting rod 807, causing the second connecting rod 807 to... The rod 807 is rigidly connected to the rotating shaft 808 in the middle of the pressure block 809. When the guide block 805 slides, it pulls one end of the first connecting rod 806, which in turn pulls the second connecting rod 807 to rotate. The second connecting rod 807 drives the rotating shaft 808 to rotate, causing the pressure block 809, which is fixedly sleeved on the outer wall of the rotating shaft 808, to rotate accordingly. The inclined surface at the bottom of the pressure block 809 is then in contact with the outer wall of the sealing strip 4. During the swing of the pressure block 809, it applies a continuously increasing positive pressure to the sealing strip 4, thereby forcing the sealing strip 4 to elastically deform towards the door frame 1. During this process, the magnetic block 810 embedded in the pressure block 809 and the magnetic plate 5 in the sealing strip 4 generate additional repulsive force due to the repulsion of like poles. This results in the four sets of pressure blocks 809 being distributed in a rectangular array, ensuring that the four corners and the middle of the sealing strip 4 are evenly stressed, thereby improving the sealing effect of the sealing strip 4. Secondly, when the door panel 2 opens and closes, it collides with the wall, causing the rubber pad 902 on the side wall of the door panel 2 to make flexible contact with the wall first. The rubber pad 902 uses its own elastic deformation to initially buffer the impact. At the same time, its outer wall slides tightly against the inner wall of the box 901. The remaining impact force generated by the collision is transmitted synchronously to the third connecting rod 906 on both sides through the mounting block 907 at the bottom of the rubber pad 902. The third connecting rod 906 will push the two sets of sliders 905 symmetrically distributed around the mounting block 907 to slide in opposite directions along the central column 903. During the sliding process, the sliders 905 simultaneously squeeze the springs 904 that overlap with the inner wall of the box 901 at both ends. The springs 904 further absorb the remaining impact energy through elastic expansion and contraction. The linkage structure of the symmetrical sliders 905 and springs 904 evenly distributes the concentrated impact force to the entire area of ​​the box 901, thereby avoiding the tilting and displacement of the door panel 2 due to unilateral force. Ultimately, it effectively weakens the vibration and impact generated by the opening and closing of the door panel 2, thereby preventing the hinge 3 from loosening due to repeated impacts.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel structure airtight door for civil defense, comprising a door frame (1), characterized in that: The outer wall of the door frame (1) is provided with a door panel (2), the side wall of the door frame (1) is provided with a hinge (3), the outer wall of the door panel (2) is fixedly fitted with a sealing strip (4), the inner wall of the sealing strip (4) is inlaid with a magnetic plate (5), the inner wall of the door panel (2) is fixedly installed with a guide rod (6), the outer wall of the guide rod (6) is provided with a guide groove (7), the inner cavity of the door panel (2) is provided with a sealing component (8), and the side wall of the door panel (2) is provided with a buffer protection component (9).

2. The steel structure airtight door for civil defense as described in claim 1, characterized in that: There are three hinges (3), and the three hinges (3) are arranged in parallel. One end of the three hinges (3) is connected and fixed to the side wall of the door frame (1), and the other end is connected and fixed to the side wall of the door panel (2).

3. A steel structure airtight door for civil defense as described in claim 1, characterized in that: The sealing assembly (8) includes a handwheel (801) disposed on the outer wall of the door panel (2), a worm gear (802) fixedly sleeved on the inner wall of the handwheel (801), a threaded rod (803) disposed in the inner cavity of the door panel (2), a worm wheel (804) fixedly sleeved on the outer wall of the threaded rod (803), a guide block (805) threadedly connected to the outer wall of the worm wheel (804), a bottom of the guide block (805) rotatably connected to one end of a first connecting rod (806), the other end of the first connecting rod (806) rotatably connected to one end of a second connecting rod (807), a rotating shaft (808) fixedly sleeved on the inner wall of the other end of the second connecting rod (807), a pressure block (809) fixedly sleeved on the outer wall of the rotating shaft (808), and a magnet (810) embedded in the inner wall of the pressure block (809).

4. A steel structure airtight door for civil defense as described in claim 3, characterized in that: The outer helix of the worm (802) is staggered and meshes with the outer teeth of the worm wheel (804). One end of the threaded rod (803) is constructed with a forward thread, and the other end is constructed with a reverse thread. The guide rod (6), guide groove (7), and guide block (805) are considered as a set of movable components, and there are two sets of such movable components, which are symmetrically arranged with the worm wheel (804) as the center. The outer walls of the two guide blocks (805) slide in contact with the inner wall of the guide groove (7). The first connecting rod (806), the second connecting rod (807), the rotating shaft (808), the pressure block (809), and the magnetic block (810) are considered as a set of movable components, and there are four sets of such movable components, which are arranged in a rectangular array. The bottom cross-section of the four pressure blocks (809) is inclined, and the inclined surface is slidably attached to the outer wall of the sealing strip (4). The bottom of the four magnetic blocks (810) and the un-embedded side of the magnetic plate (5) are respectively the S poles, and they are arranged in a magnetically repulsive manner.

5. A steel structure airtight door for civil defense as described in claim 1, characterized in that: The buffer protection component (9) includes a box (901) fixedly installed on the inner wall of the door panel (2), a rubber pad (902) provided on the outer wall of the box (901), a central column (903) fixedly installed on the inner wall of the box (901), a spring (904) provided on the outer wall of the central column (903), a slider (905) provided on the outer wall of the central column (903), a third connecting rod (906) provided on the outer wall of the slider (905), and an installation block (907) fixedly installed on the bottom of the rubber pad (902).

6. A steel structure airtight door for civil defense as described in claim 5, characterized in that: The buffer protection component (9) is considered as a set of movable components, and there are two sets of movable components, which are respectively set on the upper and lower ends of the side wall of the door panel (2). The central column (903), spring (904), slider (905) and third link (906) are considered as a set of movable components, and there are two sets of movable components, which are respectively set symmetrically with the mounting block (907) as the center. One end of the two springs (904) overlaps with the inner wall of the box (901), and the other end overlaps with the side wall of the two sliders (905). The inner wall of the two sliders (905) slides against the outer wall of the central column (903). One end of the two third links (906) is rotatably connected to the top of the two sliders (905), and the other end is rotatably connected to the bottom of the mounting block (907). The outer wall of the rubber pad (902) slides against the inner wall of the box (901).

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