Rear-mounted threshold-free light-weight double-leaf protective air-tight door and mounting method

Abstract

The invention discloses a rear-mounted threshold-free light-weight double-leaf protective air-tight door and a mounting method, the rear-mounted threshold-free light-weight double-leaf protective air-tight door comprises a door frame and door leaves mounted on two sides of the door frame, the door frame comprises an upper rolling frame, a left rolling frame, a right rolling frame and a lower horizontal support plate, a locking seat is mounted on the upper rolling frame, and a locking hole is formed in the lower horizontal support plate; double sealing strips are arranged on the upper rolling frame, the left rolling frame and the right rolling frame; the two door leaves are each provided with a locking and sealing linkage component, and each locking and sealing linkage component comprises a plurality of plug pin assemblies installed on the corresponding door leaf, a linkage assembly connected with the plug pin assemblies, a driving assembly driving the linkage assembly to act and a lower sealing assembly fixedly installed at the bottom of the plug pin assemblies. The door leaf is composed of a steel framework, a light steel front panel and a light steel rear panel. The door adopts modular design on the whole, is suitable for intelligent manufacturing, is convenient to install and construct, has relatively strong locking capability and leakproofness, is simple and convenient to operate, and is worthy of popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of protective airtight doors, and in particular to a rear-mounted threshold-free lightweight double-leaf protective airtight door and an installation method thereof. Background Art

[0002] The protective closed door is a special door used in protective projects. It can block both shock waves and toxic agents. It combines the dual functions of a protective door and a closed door. When subjected to external threats such as air raids and explosions, it can effectively protect personnel, equipment and materials from shock wave overpressure, radioactive contamination, chemical agents, etc., and ensure the safety and airtightness of the internal space of the protective project. The protective closed door is mainly composed of door leaves, door frames and sealing devices. When shock waves are generated by external explosions, the door leaves of the protective closed door rely on their own structural strength and a stable connection with the door frame to withstand the pressure of the shock wave, dispersing the pressure to the door frame and the surrounding wall structure to prevent the shock wave from directly entering the interior of the protective project. At the same time, in the closed state, the sealing device plays a role, forming a tight barrier to prevent harmful substances such as toxic agents from entering through the door gap. The existing door leaf main beam is usually welded with steel plates. This method is not suitable for the current intelligent assembly line manufacturing process. The manufacturing process is cumbersome and the overall cost is high. In order to improve the overall sealing performance, the existing protective closed doors usually have a bottom threshold, and the setting of the threshold makes the vehicle passability worse.

[0003] Traditionally, the on-site installation of door frames is undertaken by civil construction units. When pouring door frames, the construction plan is to support the formwork and pour the door frames together with the steel bars at the door frame wall after debugging and fixing. It mainly includes door frame positioning and formwork, installation of door frame embedded parts, concrete pouring, door frame installation, door frame fixing and adjustment, and installation of accessories and decorations. Due to the existence of civil construction errors, the accuracy of door frame installation cannot be guaranteed, resulting in certain problems in the installation of subsequent door leaves. In terms of construction procedures, other synchronous construction procedures on site are delayed due to the process of door frame installation, formwork and pouring. Summary of the invention

[0004] The purpose of the present invention is to provide a rear-mounted threshold-free lightweight double-leaf protective closed door and an installation method. The door adopts a modular design as a whole, is suitable for intelligent manufacturing, is easy to install and construct, has strong locking ability and airtightness, is simple and convenient to operate, and is worthy of popularization and application.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A rear-mounted, threshold-free, lightweight, double-leaf protective and airtight door comprises a door frame fixedly mounted at a door opening of a building structure and two door leaves hingedly mounted on both sides of the door frame, the door frame comprising an upper rolled frame, a left rolled frame, a right rolled frame and a lower horizontal support plate, a locking seat is fixedly mounted on the upper rolled frame, and a locking hole is arranged on the lower horizontal support plate; double-sealed seams are arranged on the upper rolled frame, the left rolled frame and the right rolled frame, and when the door leaf is in a closed state, the double-sealed seams perform top and side sealing on the door leaf and the door frame; on the two leaves, the A locking and sealing linkage component is respectively installed on the door leaf, and the locking and sealing linkage component includes a plurality of latch assemblies installed on the door leaf, a linkage assembly connecting the plurality of latch assemblies, a driving assembly for driving the linkage assembly to move, and a lower sealing assembly fixedly installed at the bottom of the latch assembly. When the driving assembly drives the linkage assembly to make the latch assembly inserted into the locking seat or the locking hole, the lower sealing assembly contacts the lower horizontal support plate to achieve bottom sealing. The door leaf consists of a steel frame and a light steel front panel and a light steel rear panel fixedly connected to the outside of the steel frame by rivets.

[0006] Preferably, the upper rolled frame is fixedly installed between the tops of the left rolled frame and the right rolled frame, and the lower horizontal support plate is fixedly installed between the bottoms of the left rolled frame and the right rolled frame; the upper rolled frame, the left rolled frame and the right rolled frame are all integrally formed from steel plates using a rolling process.

[0007] Preferably, wedge-shaped blocks are fixedly provided on both sides of the lower horizontal support plate, and the wedge-shaped blocks are in contact with the lower sealing assembly to seal the bottom corner of the door frame.

[0008] Preferably, double sealing grooves are provided on the upper rolled frame, the left rolled frame and the right rolled frame, and the double sealing strips are installed in the double sealing grooves; when the upper rolled frame, the left rolled frame and the right rolled frame are fixedly spliced, the three double sealing grooves are arranged in a door shape.

[0009] Preferably, the steel frame is formed by splicing a side fence and a rectangular crossbeam; the side fence is integrally formed from a steel plate through a rolling process, and the side fence is U-shaped as a whole.

[0010] Preferably, the two sides of the side fence converge inwardly, and a plurality of through holes compatible with the rectangular crossbeam are arranged at intervals on the side fence. The rectangular crossbeam is installed between the two inwardly converging parts of the side fence and passes through the through holes, and is fixedly connected to the light steel front panel or the light steel rear panel by riveting; the middle part of one side of the side fence protrudes outwardly, and one side of the outwardly protruding part is fixedly connected to the light steel front panel and the light steel rear panel by riveting.

[0011] Preferably, the driving assembly includes a base fixedly mounted on the door leaf, a rotating shaft rotatably mounted in the base, a gear fixedly mounted on the rotating shaft, handwheels detachably mounted at both ends of the rotating shaft, and a rack slidably mounted on the base, the gear is meshingly connected to the rack, and the two handwheels are located on both sides of the door leaf.

[0012] Preferably, the linkage assembly includes two lifting frames hingedly connected to the ends of the racks, two first connecting rods movably connected at both ends of the two lifting frames, a second connecting rod hingedly installed on the top of the first connecting rod, a third connecting rod hingedly installed on the bottom of the first connecting rod, a fourth connecting rod hingedly installed at one end of the second connecting rod and a fifth connecting rod hingedly installed on the third connecting rod. The two lifting frames drive the two first connecting rods to rise and fall synchronously, so that the second connecting rod and the third connecting rod swing around the hinge axis, thereby driving the fourth connecting rod and the fifth connecting rod to rise and fall.

[0013] Preferably, the latch assembly includes a locking sleeve fixedly mounted on the door leaf and a latch slidably mounted in the locking sleeve, one end of the latch has a folded line lock tongue, and the other end of the latch is hingedly connected to the fourth connecting rod or the fifth connecting rod.

[0014] Preferably, the lower sealing assembly includes a connecting member fixedly mounted on the latch, a lower pressure beam fixedly mounted on the connecting member, and a sealing member fixedly mounted on the lower pressure beam.

[0015] A method for installing a rear-mounted threshold-free lightweight double-leaf protective closed door comprises the following steps: Step 1: pouring concrete: ensure the flatness and verticality of the front and side faces of the building structure, and wait for the concrete to completely solidify and reach the designed strength; Step 2: Temporary fixation of the door frame: Place the door frame in the reserved position according to the design requirements, ensure that the contact surface between the door frame and the building structure is flat and has no gaps, and use temporary supports or clamps to fix the door frame in the predetermined position to prevent the door frame from moving when the bottom anchor bolts are installed; Step 3, door frame anchoring: first measure the length below the sleeve of the rear bottom expansion anchor bolt and mark the inch drilling depth; then drill holes, clean holes with a hard brush, and empty holes with an air pump; then expand holes and empty holes with an air pump; then install the rear bottom expansion anchor bolt and tighten the nut; then install the door frame on the rear bottom expansion anchor bolt and tighten the nut; Step 4: Gap filling: Fill the gap between the door frame and the building structure with sealing material, ensure that the filling material is fully cured, and check the filling effect to ensure that there is no leakage or loose filling; Step 5, Install the sealing strip: Install the sealing strip around the door frame to enhance the sealing performance between the door frame and the wall. Ensure that the strip is installed flat and firmly without loosening or falling off, and check the sealing effect of the strip; Step 6, hinge installation: Install the hinge on the door frame and ensure that the hinge is positioned accurately and firmly. The hinge installation should meet the requirements of the door leaf's opening and closing flexibility and stability, and ensure that the hinge and door frame are tightly connected without looseness. Step 7: Door leaf installation: Connect the door leaf to the door frame through hinges, and adjust the position and height of the door leaf so that it remains parallel to the door frame and opens and closes smoothly; Step 8: Door leaf debugging: debug the installed door leaf.

[0016] In the present invention, the locking and sealing linkage components are arranged to lock the door leaf while sealing the door leaf and the bottom of the door frame, killing two birds with one stone, eliminating the need for a threshold, and improving the vehicle's passability while ensuring overall sealing. The principle of the connecting rod and lever is utilized in the linkage assembly, and the gear rack structure in the driving assembly is coordinated, so that the operator only needs to rotate a small number of circles to achieve locking or unlocking operations. The operation is simple and efficient, and a larger locking torque can be achieved. The positions of the latch components are evenly arranged, and the overall safety is high. The broken line lock tongue in the latch assembly is easy to process, low in cost, explosion-proof, anti-rebound, and has a large extrusion force.

[0017] The wedge-shaped blocks arranged on both sides of the bottom of the door frame can contact the lower sealing assembly, thereby enhancing the sealing ability at the bottom corner of the door frame. The seal and the double-sealed seam strip form an integral sealing system with strong sealing ability.

[0018] The upper rolled frame, left rolled frame, and right rolled frame are all formed in one piece by a rolling process using steel plates. They can be rolled in one piece to form double sealing grooves, which not only ensures structural strength and reduces overall weight, but also facilitates the installation of double sealing seams. The rolling process used is an automated assembly line process, which is convenient for intelligent manufacturing and easy to construct. The door frame and reserved concrete adopt a post-anchor installation solution, which is firm, reliable, and easy to construct.

[0019] The side fence, light steel front panel and light steel rear panel in the door leaf are made by folding technology. By designing the cross-sectional structure of the side fence and innovatively combining the rivet nut fixing method, the door leaf installation process can be fully automated and mechanized. No welding is required during the entire installation process, and the structure is light and high in strength. The side fence and rectangular beam are embedded inside the light steel front panel and the light steel rear panel. The rectangular beam mainly bears the resistance role. The light steel front panel is embedded with the light steel rear panel and the side fence, and riveted with flat head rivet nuts. The rectangular beam passes through the preset holes of the variable fence and is fixed between the light steel front panel and the light steel rear panel.

[0020] The post-installation process of the anchor bolt disclosed in this scheme has high construction efficiency: compared with the traditional on-site casting process, the post-installation anchor bolt installation method does not need to wait for the concrete to solidify, and the anchor bolt can be installed immediately after the concrete wall construction is completed, which greatly shortens the construction period and improves the construction efficiency; easy maintenance: if the door frame or wall needs to be repaired or replaced, the post-installation anchor bolt installation method allows the bolt to be removed and replaced without destroying the entire wall; this reduces the cost and difficulty of maintenance and improves maintenance efficiency; efficient connection, firm and reliable: the post-installation anchor bolt has strong tensile and shear resistance, and excellent tensile and seismic properties. The anchor bolt is a countersunk hidden setting, which is aesthetically pleasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention in use state; Figure 2 It is a schematic diagram of the structural axial side of the present invention; Figure 3 It is a front view schematic diagram of the structure of the present invention; Figure 4 It is a schematic diagram of the structure of the locking and sealing linkage components of the present invention; Figure 5 It is a cross-sectional schematic diagram of the drive assembly of the present invention; Figure 6 This is a schematic diagram of the structure of the latch assembly of the present invention; Figure 7 It is an enlarged schematic diagram of the local structure of the lower sealing assembly of the present invention; Figure 8 This is a schematic diagram of the hinge structure of the present invention; Fig. 9 This is a schematic diagram of the door frame structure of the present invention; Fig.10 It is a partial enlarged schematic diagram of a door frame structure viewed from above according to the present invention; Fig.11 It is a schematic diagram of the local structure of the upper rolling frame of the present invention; Fig.12 This is a schematic diagram of the overall structure of the door leaf of the present invention; Fig.13 This is a schematic diagram of the structure of the light steel rear panel of the present invention; Fig.14 This is a schematic diagram of the structure of the light steel front panel of the present invention; Fig.15 It is a schematic cross-sectional view of a door leaf of the present invention; Fig.16 It is a schematic diagram of the BB section of the present invention; Fig.17 It is a partial enlarged schematic diagram of the BB section of the present invention; Fig.18This is a schematic diagram of the axial side of the door leaf of the present invention with the light steel front panel hidden; Fig.19 This is a schematic diagram of the structure of the side fence of the present invention; Fig. 20 Another partial cross-sectional enlarged schematic diagram of the present invention; Fig.21 It is a partial enlarged schematic diagram of the vertical section of the door frame of the present invention; In the figure: 1, door frame; 2, door leaf; 3, hinge; 4, locking and sealing linkage component; 5, middle seam seal; 10, upper rolled frame; 11, left rolled frame; 12, right rolled frame; 13, lower horizontal support plate; 14, double sealing groove; 15, double tight seam strip; 16, wedge-shaped stopper; 17, locking seat; 18, locking hole; 19, anchor plate; 20, steel frame; 21, light steel front panel; 22, light steel rear panel; 30, hinge shaft; 31, hinge seat; 32, pivot arm; 33, pad; 34, first waist-shaped hole; 35, The second waist-shaped hole; 40, the latch assembly; 41, the linkage assembly; 42, the drive assembly; 43, the lower sealing assembly; 200, the side fence; 201, the rectangular beam; 400, the locking sleeve; 401, the latch; 410, the lifting frame; 411, the first connecting rod; 412, the second connecting rod; 413, the third connecting rod; 414, the fourth connecting rod; 415, the fifth connecting rod; 420, the base; 421, the rotating shaft; 422, the gear; 423, the hand wheel; 424, the rack; 430, the connecting piece; 431, the lower pressure beam; 432, the sealing piece. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1 to Figure 21 The rear-mounted, threshold-free, lightweight, double-leaf protective and airtight door shown in the figure comprises a door frame 1 fixedly mounted at the door opening of the building structure and two door leaves 2 hingedly mounted on the left and right sides of the door frame 1. The door frame 1 is fixedly connected to the building structure by rear anchoring. After installation, a dust plug is used to cover the anchoring bottom bolts, making the appearance more beautiful. Two hanging rings are installed on the top of the door leaf 2, and a handle for opening and closing is also installed on the door leaf 2. A center seam seal 5 is provided between the two door leaves 2. When the two door leaves 2 are closed, the center seam seal 5 seals the middle position of the two door leaves 2.

[0023] The door frame 1 includes an upper rolled frame 10, a left rolled frame 11, a right rolled frame 12 and a lower horizontal support plate 13. The upper rolled frame 10 is fixedly installed between the tops of the left rolled frame 11 and the right rolled frame 12 by welding, and the lower horizontal support plate 13 is fixedly installed between the bottoms of the left rolled frame 11 and the right rolled frame 12 by welding, and a rectangular door frame 1 is formed after being fixedly connected. The upper rolled frame 10, the left rolled frame 11 and the right rolled frame 12 are all integrally formed of steel plates using a rolling process. The upper rolled frame 10, the left rolled frame 11, the right rolled frame 12 and the lower horizontal support plate 13 are all fixedly connected to the building structure by anchoring bottom expansion bolts.

[0024] Double-sealed seams 15 are fixedly arranged on the upper rolled frame 10 , the left rolled frame 11 and the right rolled frame 12 . When the door leaf 2 is in a closed state, the double-sealed seams 15 seal the door leaf 2 and the door frame 1 at the top and sides.

[0025] Double sealing grooves 14 are integrally provided on the upper rolling frame 10, the left rolling frame 11 and the right rolling frame 12, and double sealing strips 15 are installed in the double sealing grooves 14. When the upper rolling frame 10, the left rolling frame 11 and the right rolling frame 12 are fixedly spliced, the three double sealing grooves 14 are arranged in a door shape, forming an inverted U-shaped sealing system with only the bottom open. The double sealing strips 15 are one high and one low, the high one has great flexibility and is conducive to deformation, and the low one has low flexibility, and the combination of the two flexibility makes the sealing higher.

[0026] Wedge-shaped blocks 16 are fixedly arranged on both sides of the lower horizontal support plate 13. The wedge-shaped blocks 16 are specifically arranged at two corner positions at the bottom of the door frame 1. When the door leaf 2 is closed, the wedge-shaped blocks 16 contact the lower sealing assembly 43 and seal the bottom corners of the door frame 1, thereby improving the sealing ability at the corners.

[0027] A locking seat 17 is fixedly installed on the upper rolled frame 10, and a locking hole 18 is provided on the lower horizontal support plate 13. Two or more anchor plates 19 are fixedly installed on both the left rolled frame 11 and the right rolled frame 12, and a hinge 3 is fixedly installed on the anchor plate 19, and the other end of the hinge 3 is fixedly installed on the side of the door leaf 2. An anchor reinforcement sleeve is provided on the back of the anchor plate 19, and one end of the anchor bottom bolt is installed in the anchor reinforcement sleeve, which improves the stability of the installation of the anchor bottom bolt.

[0028] The hinge 3 includes a hinge seat 31 and a rotating shaft arm 32 which are hingedly connected by a hinge shaft 30. A shim plate 33 can be detachably installed at the bottom of the hinge seat 31 and the rotating shaft seat 32. The shim plate 33 is used to adjust the installation height on the door frame 1 or the door leaf 2 to ensure installation accuracy. A first waist-shaped hole 34 is provided on the hinge seat 31, and a second waist-shaped hole 35 is provided on the rotating shaft arm 32. The shim plate 33, the first waist-shaped hole 34 and the second waist-shaped hole 35 are used to adjust the displacement of the hinge 3 in three directions to ensure the installation accuracy of the hinge 3.

[0029] The door leaf 2 is composed of a steel frame 20 and a light steel front panel 21 and a light steel rear panel 22 fixedly connected to the outside of the steel frame 20 by riveting. The steel frame 20 is spliced ​​by a side fence 200 and a rectangular crossbeam 201. The side fence 200 is integrally formed by a steel plate through a rolling process, and the side fence 200 is U-shaped as a whole. Specifically, the two sides of the side fence 200 converge inwardly, and a plurality of through holes matching the rectangular crossbeam 201 are arranged at intervals on the side fence 200. The rectangular crossbeam 201 is fixedly installed between the two inwardly converging parts of the side fence 200 and passes through the through holes, and is fixedly connected to the light steel front panel 21 or the light steel rear panel 22 by riveting; the middle part of one side of the side fence 200 bulges outwardly, and one side of the outwardly bulging part is fixedly connected to the light steel front panel 21 and the light steel rear panel 22 by riveting. Foamed aluminum is filled between the light steel front panel 21, the light steel rear panel 22 and the steel frame 20. The inwardly converging parts of the two sides of the side fence 200 are for sinking the flat head after the installation of the rivet nut. The middle part of one side of the side fence 200 is convex outward, and the two sides of the convexity are for sinking the platform after the installation of the side rivet nut.

[0030] A locking and sealing linkage component 4 is respectively installed on the two door leaves 2. The locking and sealing linkage component 4 includes a plurality of latch assemblies 40 installed on the door leaf 2, a linkage component 41 connecting the plurality of latch assemblies 40, a driving component 42 for driving the linkage component 41 to move, and a lower sealing component 43 fixedly installed at the bottom of the latch assembly 40. When the driving component 42 drives the linkage component 41 to make the latch assembly 40 inserted in the locking seat 17 or the locking hole 18, the lower sealing component 43 contacts the lower horizontal support plate 13 to achieve bottom sealing.

[0031] The driving assembly 42 includes a base 420 fixedly mounted on the door leaf 2, a rotating shaft 421 rotatably mounted in the base 420, a gear 422 fixedly mounted on the rotating shaft 421 through a key, hand wheels 423 detachably mounted on both ends of the rotating shaft 421, and a rack 424 slidably mounted on the base 420, the gear 422 is meshed and connected with the rack 424, and the two hand wheels 423 are located on both sides of the door leaf 2. Specifically, rectangular holes are provided at both ends of the rotating shaft 421, and a rectangular block is provided on the hand wheel 423. When the rectangular block is installed in the rectangular hole, rotating the hand wheel 423 can make the rotating shaft 421, and the rack 424 move vertically and linearly through the gear 422.

[0032] The linkage assembly 41 includes two lifting frames 410 hingedly connected to the ends of the rack 424, two first connecting rods 411 movably connected to the two ends of the two lifting frames 410, a second connecting rod 412 hingedly installed at the top of the first connecting rod 411, a third connecting rod 413 hingedly installed at the bottom of the first connecting rod 411, a fourth connecting rod 414 hingedly installed at one end of the second connecting rod 412, and a fifth connecting rod 415 hingedly installed on the third connecting rod 413. The two lifting frames 410 drive the two first connecting rods 411 to rise and fall synchronously, so that the second connecting rod 412 and the third connecting rod 413 swing around the hinge shafts hingedly connected to the door leaf 2, respectively, and then drive the fourth connecting rod 414 and the fifth connecting rod 415 to rise and fall, so that the latch 401 slides vertically in the locking sleeve 400. Horizontal slideways are arranged at both ends of the lifting frames 410, and the first connecting rod 411 is slidably installed in the horizontal slideways through the pin shaft.

[0033] The latch assembly 40 includes a locking sleeve 400 fixedly mounted on the door leaf 2 and a latch 401 slidably mounted in the locking sleeve 400. One end of the latch 401 has a folded line lock tongue, and the other end of the latch 401 is hingedly connected to the fourth connecting rod 414 or the fifth connecting rod 415 through a pin shaft. The folded line lock tongue is convenient for plugging into the locking seat 17 or the locking hole 18. Specifically, a slider is provided in the locking sleeve 400, and a slide groove is provided on the latch 401. The slider is located in the slide groove, so that the latch 401 has only one degree of freedom of vertical sliding.

[0034] The lower sealing assembly 43 includes a connecting member 430 fixedly mounted on the latch 401, a lower pressing beam 431 fixedly mounted on the connecting member 430, and a sealing member 432 fixedly mounted on the lower pressing beam 431. The lower pressing beam 431 is L-shaped, and the sealing member 432 is adapted to the shape of the lower pressing beam 431. The bottom of the sealing member 432 is located at the lower side of the lower pressing beam 431, and the side of the sealing member 432 is located outside the side of the lower pressing beam 431. The side of the lower pressing beam 431 is provided with an inclined surface, and the inclined surface contacts the wedge-shaped stopper 16.

[0035] like Figure 1 to Figure 21The installation method of a rear-mounted threshold-free lightweight double-leaf protective closed door shown in the figure comprises the following steps: Step 1: pouring concrete: ensure the flatness and verticality of the front and side faces of the building structure, and wait for the concrete to completely solidify and reach the designed strength; Step 2: Temporarily fix the door frame 1: Place the door frame 1 in the reserved position according to the design requirements, ensure that the contact surface between the door frame 1 and the building structure is flat and has no gaps, and use temporary supports or clamps to fix the door frame 1 in the predetermined position to prevent the door frame 1 from moving when the bottom anchor bolts are installed; Step 3, anchoring the door frame 1: first measure the length below the sleeve of the rear bottom expansion anchor bolt and mark the inch drilling depth; then drill holes, clean holes with a hard brush, and empty holes with an air pump; then expand holes and empty holes with an air pump; then install the rear bottom expansion anchor bolt and tighten the nut; then install the door frame 1 on the rear bottom expansion anchor bolt and tighten the nut; Step 4, gap filling: fill the gap between the door frame 1 and the building structure with sealing material, ensure that the filling material is fully cured, and check the filling effect to ensure that there is no leakage or loose filling; Step 5, installing the sealing strip: Install the sealing strip around the door frame 1 to enhance the sealing performance between the door frame and the wall, ensure that the strip is installed flat and firmly without loosening or falling off, and check the sealing effect of the strip; Step 6, installation of hinge 3: According to the design requirements, install hinge 3 on door frame 1, and ensure that the position of hinge 3 is accurate and firm. The installation of hinge 3 should meet the requirements of opening and closing flexibility and stability of door leaf 2, and ensure that the connection between hinge 3 and door frame 1 is tight and not loose; Step 7: Install the door leaf 2: Connect the door leaf 2 to the door frame 1 through the hinge 3, and adjust the position and height of the door leaf 2 so that it remains parallel to the door frame 1 and can be opened and closed smoothly; Step 8, debugging of door leaf 2: Debug the installed door leaf 2 to check whether it can be opened and closed flexibly, whether the seal is tight, and whether there are any abnormal sounds.

[0036] The above embodiments are only some illustrations of the concept and implementation of the present invention, and are not intended to limit the same. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A rear-mounted, threshold-free, lightweight double-leaf protective closed door, comprising a door frame (1) fixedly mounted at a door opening of a building structure and two door leaves (2) hingedly mounted on both sides of the door frame (1), characterized in that: The door frame (1) comprises an upper rolled frame (10), a left rolled frame (11), a right rolled frame (12) and a lower horizontal support plate (13); a locking seat (17) is fixedly mounted on the upper rolled frame (10), and a locking hole (18) is arranged on the lower horizontal support plate (13); double-sealed seams (15) are arranged on the upper rolled frame (10), the left rolled frame (11) and the right rolled frame (12); when the door leaf (2) is in a closed state, the double-sealed seams (15) seal the door leaf (2) and the door frame (1) at the top and sides; a locking and sealing linkage component (4) is respectively mounted on the two door leaves (2); the locking and sealing linkage component (4) ) comprises a plurality of latch assemblies (40) mounted on a door leaf (2), a linkage assembly (41) connecting the plurality of latch assemblies (40), a driving assembly (42) driving the linkage assembly (41) to move, and a lower sealing assembly (43) fixedly mounted on the bottom of the latch assemblies (40); when the driving assembly (42) drives the linkage assembly (41) so that the latch assemblies (40) are inserted into the locking seat (17) or the locking hole (18), the lower sealing assembly (43) contacts the lower horizontal support plate (13) to achieve bottom sealing; the door leaf (2) is composed of a steel frame (20) and a light steel front panel (21) and a light steel rear panel (22) fixedly connected to the outside of the steel frame (20) by riveting.

2. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 1, characterized in that: Wedge-shaped stoppers (16) are fixedly arranged on both sides of the lower horizontal support plate (13); the wedge-shaped stoppers (16) are in contact with the lower sealing assembly (43) to seal the bottom corner of the door frame (1).

3. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 1 or 2, characterized in that: Double sealing grooves (14) are provided on the upper rolled frame (10), the left rolled frame (11) and the right rolled frame (12), and the double sealing strips (15) are installed in the double sealing grooves (14); when the upper rolled frame (10), the left rolled frame (11) and the right rolled frame (12) are fixedly spliced, the three double sealing grooves (14) are arranged in a door shape.

4. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 3, characterized in that: The steel frame (20) is formed by splicing a side fence (200) and a rectangular crossbeam (201); the side fence (200) is integrally formed from a steel plate through a rolling process, and the side fence (200) is U-shaped as a whole.

5. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 4, characterized in that: The two sides of the side fence (200) converge inwardly, and a plurality of through holes compatible with the rectangular crossbeam (201) are arranged at intervals on the side fence (200). The rectangular crossbeam (201) is installed between the two inwardly converging parts of the side fence (200) and passes through the through holes, and is fixedly connected to the light steel front panel (21) or the light steel rear panel (22) by riveting. The middle part of one side of the side fence (200) protrudes outwardly, and one side of the outwardly protruding part is fixedly connected to the light steel front panel (21) and the light steel rear panel (22) by riveting.

6. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 1 or 5, characterized in that: The driving assembly (42) comprises a base (420) fixedly mounted on the door leaf (2), a rotating shaft (421) rotatably mounted in the base (420), a gear (422) fixedly mounted on the rotating shaft (421), hand wheels (423) detachably mounted on both ends of the rotating shaft (421), and a rack (424) slidably mounted on the base (420), the gear (422) being meshingly connected to the rack (424), and the two hand wheels (423) being located on both sides of the door leaf (2).

7. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 6, characterized in that: The linkage assembly (41) comprises two lifting frames (410) hingedly connected to the ends of the racks (424), two first connecting rods (411) movably connected at both ends of the two lifting frames (410), a second connecting rod (412) hingedly mounted on the top of the first connecting rod (411), a third connecting rod (413) hingedly mounted on the bottom of the first connecting rod (411), a fourth connecting rod (414) hingedly mounted on one end of the second connecting rod (412), and a fifth connecting rod (415) hingedly mounted on the third connecting rod (413). The two lifting frames (410) drive the two first connecting rods (411) to rise and fall synchronously, so that the second connecting rod (412) and the third connecting rod (413) swing around the hinge axis, thereby driving the fourth connecting rod (414) and the fifth connecting rod (415) to rise and fall.

8. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 7, characterized in that: The latch assembly (40) comprises a locking sleeve (400) fixedly mounted on the door leaf (2) and a latch (401) slidably mounted in the locking sleeve (400); one end of the latch (401) has a folded line lock tongue, and the other end of the latch (401) is hingedly connected to the fourth connecting rod (414) or the fifth connecting rod (415).

9. The rear-mounted threshold-free lightweight double-leaf protective airtight door according to claim 8, characterized in that: The lower sealing assembly (43) comprises a connecting piece (430) fixedly mounted on the latch (401), a lower pressure beam (431) fixedly mounted on the connecting piece (430), and a sealing piece (432) fixedly mounted on the lower pressure beam (431).

10. A method for installing a rear-mounted threshold-free lightweight double-leaf protective closed door according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: pouring concrete: ensure the flatness and verticality of the front and side faces of the building structure, and wait for the concrete to completely solidify and reach the designed strength; Step 2: temporarily fix the door frame (1): place the door frame (1) at the reserved position according to the design requirements, ensure that the contact surface between the door frame (1) and the building structure is flat and has no gaps, and use a temporary support or clamp to fix the door frame (1) at the predetermined position to prevent the door frame (1) from moving when the rear bottom anchor bolts are installed; Step 3, door frame (1) anchoring: first measure the length below the sleeve of the rear bottom anchor bolt and mark the drilling depth; then drill the hole, clean the hole with a hard brush, and empty the hole with an air pump; then expand the hole and empty the hole with an air pump; then install the rear bottom anchor bolt and tighten the nut; Then install the door frame (1) on the rear bottom anchor bolts and tighten the nuts; Step 4: Gap filling: Fill the gap between the door frame (1) and the building structure with sealing material, ensure that the filling material is fully cured, and check the filling effect to ensure that there is no leakage or loose filling; Step 5: Installing the sealing strip: Install the sealing strip around the door frame (1) to enhance the sealing performance between the door frame and the wall. Ensure that the sealing strip is installed flat and firmly without loosening or falling off, and check the sealing effect of the sealing strip. Step 6: Installing the hinge (3): Install the hinge (3) on the door frame (1), and ensure that the hinge (3) is positioned accurately and firmly. The installation of the hinge (3) should meet the requirements of the opening and closing flexibility and stability of the door leaf (2), and ensure that the connection between the hinge (3) and the door frame (1) is tight and not loose. Step 7: Installing the door leaf (2): Connect the door leaf (2) to the door frame (1) via the hinge (3), and adjust the position and height of the door leaf (2) so that it remains parallel to the door frame (1) and can be opened and closed smoothly; Step 8: Debugging the door leaf (2): Debugging the installed door leaf (2).

Images