Post-anchored doorsill-free double-leaf anti-knock door and mounting method

Abstract

The invention discloses a rear anchoring type doorsill-free double-leaf anti-knock door and a mounting method, the rear anchoring type doorsill-free double-leaf anti-knock door comprises a door frame and door leaves, 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 fixedly mounted on the upper rolling frame, and a locking hole is formed in the lower horizontal support plate; double sealing seam strips are arranged on the upper rolling frame, the left rolling frame and the right rolling frame, a center seam sealing strip is arranged between the two door leaves, and bottom sealing strips are arranged at the bottoms of the door leaves; a linkage locking component is installed on the door leaf and comprises a driving assembly installed on the door leaf, two linear driving assemblies installed at the upper end and the lower end of the driving assembly in a power mode and a plurality of plug pin assemblies installed on the linear driving assemblies. The door adopts modular design on the whole, is suitable for intelligent manufacturing, is convenient to install and construct, has relatively strong anti-explosion capability and leakproofness, is simple and convenient to operate, and is worthy of popularization and application.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof doors, and in particular to a rear-anchored threshold-free double-leaf explosion-proof door and an installation method thereof. Background Art

[0002] Explosion-proof and anti-rebound doors are an important part of underground civil air defense projects. After closing, the two sides of the explosion-proof and anti-rebound doors can be opened independently. When closed, they need to be locked with a locking device. The locking device can withstand the huge impact force generated by the explosion and prevent the door from being damaged or accidentally opened under the impact of the explosion, thereby effectively isolating the explosion area and protecting the personnel, equipment and places behind the door. When the door is hit by external force, the locking can effectively prevent the door from excessively rebounding and opening, maintain the original closed and locked state of the door, and ensure the closure and safety of the place. Most existing door frames need to be installed simultaneously with the construction of the building wall, which limits the construction time of civil engineering and affects the construction period. In order to improve the overall sealing, most of them 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-anchored threshold-free double-leaf explosion-proof 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 explosion-proof 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-anchored threshold-free double-leaf explosion-proof door comprises a door frame fixedly installed at a door opening of a building structure and two door leaves hingedly installed 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 installed on the upper rolled frame, a locking hole is arranged on the lower horizontal support plate, and the locking seat and the locking hole are arranged in a staggered manner; double sealing strips are arranged on the upper rolled frame, the left rolled frame and the right rolled frame, a middle sealing strip is arranged between the two door leaves, and a sealing strip is arranged at the bottom of the door leaf. A bottom sealing strip is arranged. When the door leaf is in a closed state, the double-sealed seam strip, the middle seam sealing strip and the bottom sealing strip seal the gaps between the door leaf and the door frame and between the two door leaves. A linkage locking component is respectively installed on the two door leaves. The linkage locking component includes a driving assembly installed on the door leaf, two linear driving assemblies whose power is installed at the upper and lower ends of the driving assembly, and a plurality of latch assemblies installed on the linear driving assembly. Through the driving assembly, the linear driving assembly drives the latch assembly to move vertically and is inserted into the locking seat or the locking hole.

[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, 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.

[0008] Preferably, the driving assembly includes a bevel gear commutator fixedly mounted on the door leaf, a handwheel powered by power installed at the front and rear ends of the bevel gear commutator, and a coupling installed at the upper and lower output ends of the bevel gear commutator, and rotating the handwheel causes the two couplings to rotate through the bevel gear commutator.

[0009] Preferably, the linear drive assembly includes a first support fixedly mounted on the door leaf, a screw rotatably mounted in the first support, a nut dynamically connected to the screw, an adapter fixedly mounted at one end of the nut, and a support frame mounted on the end of the adapter, one end of the screw is fixedly connected to the coupling, the coupling drives the screw to rotate, and the support frame moves vertically through the nut.

[0010] Preferably, the latch assembly includes a second support fixedly mounted on the door leaf and a locking head slidably mounted in the second support, one end of the locking head is connected to the support frame, and the support frame drives multiple locking heads to rise and fall synchronously.

[0011] Preferably, four locking holes are arranged at the bottom of each door leaf, and three locking seats are arranged at the top of each door leaf, and the position and number of the latch assembly are adapted to the locking holes or locking seats.

[0012] Preferably, the door leaf includes a steel frame and a front panel and a rear panel wrapped around the outside of the steel frame, a reinforcing plate is fixedly installed on one side of the door leaf, a wedge-shaped surface is provided on the side where the two door leaves are close to each other, a center seam sealing groove is provided on the wedge surface, and the center seam sealing strip is installed in the center seam sealing groove.

[0013] Preferably, the steel frame is fixed to the front panel and the rear panel by riveting; the steel frame is formed by splicing vertically arranged horizontal steel beams and vertical steel beams.

[0014] Preferably, an anchor hole is provided on the door frame, and a rear bottom-enlarged anchor bolt is passed through the anchor hole to fix the door frame; a sealing plug is also installed in the anchor hole, and the sealing plug shields the rear bottom-enlarged anchor bolt.

[0015] A method for installing a rear-anchored threshold-free double-leaf explosion-proof door comprises the following steps: Step 1: pouring concrete: ensure the flatness and verticality of the front and side faces of the building structure, pour concrete 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: Anchoring the door frame: first measure the length below the sleeve of the rear bottom 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 anchor bolt and tighten the nut; then install the door frame on the rear bottom 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, and that the connection between the hinge and the door frame is tight and not loose; 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 can open and close smoothly; Step 8. Door leaf debugging: debug the installed door leaf.

[0016] In the present invention, the upper rolled frame, the left rolled frame, and the right rolled frame are all formed in one piece by a rolling process from steel plates, and can be rolled in one piece to form a double sealing groove, 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 the reserved concrete adopt a post-anchor installation solution, which is firm and reliable and easy to construct.

[0017] The front and rear panels of the door leaf are made by folding technology, and the steel frame is fixed to the front and rear panels by riveting, so that 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.

[0018] The double-sealed seam strips, the middle seam sealing strips and the bottom sealing strips are used to seal the gaps between the door leaf and the door frame and between the two door leaves, so that all the gaps are sealed after the door leaf is closed, thus improving the overall sealing performance. The middle seam sealing strip is hidden between the two door leaves and will not be exposed when the door leaf is closed, which has better aesthetics and also ensures that the sealing system is not damaged.

[0019] The linkage locking component adopts a bevel gear commutator structure, which provides a large reduction ratio and a large axial force. The locking head is fixed in the vertical direction of the door leaf to achieve explosion-proof function. When the door leaf is subjected to positive pressure and produces a large deformation, the three-upper-lower-four structure of the locking head plays a buffering role in the positive pressure; the first support is fixed to the door leaf. When the lock receives an unbalanced force on the left and right, the first support transmits the force to the door leaf to ensure the lock's vertical movement.

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

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention from the axial side; Figure 2 It is a front view schematic diagram of the door leaf of the present invention in a closed state; Figure 3It is a schematic diagram of the installation state of the overall structure of the present invention; Figure 4 This is a schematic diagram of the door frame structure of the present invention; Figure 5 It is a schematic side view of the upper rolled frame of the present invention; Figure 6 It is an enlarged schematic diagram of the local structure of the door frame of the present invention; Figure 7 It is a schematic diagram of the structure of the linkage locking component of the present invention; Figure 8 It is a cross-sectional schematic diagram of a linear drive assembly of the present invention; Fig. 9 This is a schematic diagram of the structure of the linear drive assembly of the present invention; Fig.10 This is a schematic diagram of the hinge structure of the present invention; Fig.11 It is a partially enlarged schematic diagram of the door leaf in the closed state of the present invention; Fig.12 It is a partial cross-sectional enlarged schematic diagram of the door leaf in the closed state of the present invention; Fig.13 It is a schematic diagram of the structure of the front panel of the present invention; Fig.14 This is a schematic diagram of the rear panel structure of the present invention; Fig.15 This is a schematic diagram of the door leaf structure of the present invention; Fig.16 It is a partial enlarged schematic diagram of the vertical section of the door frame of the present invention; 1. Door frame; 2. Door leaf; 3. Anchor hole; 4. Middle seam sealing strip; 5. Bottom sealing strip; 6. Hinge; 7. Linkage locking component; 10. Upper rolled frame; 11. Left rolled frame; 12. Right rolled frame; 13. Lower horizontal support plate; 14. Double sealing groove; 15. Double sealing strip; 16. Wedge stopper; 17. Locking seat; 18. Locking hole; 20. Steel frame; 21. Front panel; 22. Rear Panel; 60, anchor plate; 61, support; 62, hinge shaft; 63, hinge reinforcement block; 70, drive assembly; 71, linear drive assembly; 72, latch assembly; 700, bevel gear commutator; 701, handwheel; 702, coupling; 710, first support; 711, lead screw; 712, nut; 713, adapter; 714, support frame; 720, second support; 721, locking head. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings: like Figures 1 to 16The rear-anchored threshold-free double-leaf explosion-proof door shown in the figure comprises a door frame 1 fixedly installed at the door opening of the building structure and two door leaves 2 hingedly installed on the left and right sides of the door frame 1. A plurality of anchor holes 3 are arranged on the door frame 1. The door frame 1 is fixed by passing rear-bottom anchor bolts through the anchor holes 3. After fixed installation, sealing plugs are also installed in the anchor holes 3 to shield the rear-bottom anchor bolts. After the sealing plugs are installed, the sealing plugs are sprayed with the same color of paint as the door frame 1. The rear-bottom anchor bolts used for fixing are not visible from the appearance, and the door frame has good aesthetics.

[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.

[0024] Double-tight seam strips 15 are fixedly arranged on the upper rolling frame 10, the left rolling frame 11 and the right rolling frame 12. When the door leaf 2 is in a closed state, the double-tight seam strips 15 seal the door leaf 2 and the door frame 1 at the top and sides. In a preferred embodiment, double sealing grooves 14 are integrally arranged on the upper rolling frame 10, the left rolling frame 11 and the right rolling frame 12, and the double-tight seam 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 opening. The double-tight seam strips 15 are one high and one low. The high one has greater flexibility and is conducive to deformation, while the low one has less flexibility. The combination of the two flexibility makes the airtightness higher.

[0025] A locking seat 17 is fixedly installed on the upper rolling frame 10, and a locking hole 18 is provided on the lower horizontal support plate 13. The locking seat 17 and the locking hole 18 are arranged in a staggered manner. In this embodiment, there are six locking seats 17 and eight locking holes 18. Wedge-shaped stoppers 16 are fixedly provided on both sides of the lower horizontal support plate 13. The wedge-shaped stoppers 16 are specifically provided at two corner positions at the bottom of the door frame 1. The wedge-shaped stoppers 16 improve the stability of the connection between the lower horizontal support plate 13 and the left rolling frame 11 and the right rolling frame 12.

[0026] A center sealing strip 4 is arranged between the two door leaves, and a bottom sealing strip 5 is fixedly arranged at the bottom of the door leaf 2, and the bottom sealing strip 5 is in contact with the lower horizontal support plate 13. When the door leaf 2 is in a closed state, the double sealing strip 15, the center sealing strip 4 and the bottom sealing strip 5 seal the gaps between the door leaf 2 and the door frame 1 and between the two door leaves 2 to form a complete sealing system.

[0027] The door leaf 2 includes a steel frame 20 and a front panel 21 and a rear panel 22 wrapped around the outside of the steel frame 20. A reinforcing plate is fixedly installed on one side of the door leaf 2, and a hinge 6 is fixedly installed on the reinforcing plate. The other end of the hinge 6 is installed on the door frame 1, and the door leaf 2 is hingedly installed on the door frame 1 through the hinge 6. A wedge-shaped surface is set on the side where the two door leaves 2 are close to each other. The wedge-shaped surface is formed by bending the front panel 21 and the rear panel 22 in one piece. A middle seam sealing groove is set on one of the wedge-shaped surfaces, and the middle seam sealing strip 4 is installed in the middle seam sealing groove. Of course, a middle seam sealing groove can also be set on both wedge-shaped surfaces, and the middle seam sealing grooves on both sides are staggered to further improve the sealing performance. The steel frame 20 is fixed to the front panel 21 and the rear panel 22 by riveting; the steel frame 20 is spliced ​​by vertically arranged horizontal steel beams and vertical steel beams.

[0028] The hinge 6 includes an anchor plate 60 fixedly installed on the door frame 1, a support 61 fixedly installed on the anchor plate 60, a hinge shaft 62 installed on the support 61 and a hinge reinforcement block 63 installed on the hinge shaft 62. A plurality of reinforcement sleeves are arranged on the back of the anchor plate 60. After installation, the bottom-enlarged anchor bolts are installed in the reinforcement sleeves to fix them to the building structure. The hinge shaft 62 is composed of three sections connected by bearings, wherein the middle section can rotate relative to the two sections on both sides, the two sections at the two ends are fixed to the support 61, and the middle section is fixed to the hinge reinforcement block 63 to achieve a hinged effect. The hinge reinforcement block 63 is fixedly connected to the door leaf 2.

[0029] A linkage locking component 7 is installed on each of the two door leaves 2, and the linkage locking component 7 is used to lock the door leaves 2. The linkage locking component 7 includes a driving component 70 installed on the door leaf 2, two linear driving components 71 whose power is installed at the upper and lower ends of the driving component 70, and a plurality of latch components 72 installed on the linear driving component 71. The linear driving component 71 drives the latch components 72 to move vertically through the driving component 70 and is inserted into the locking seat 17 or the locking hole 18.

[0030] The driving assembly 70 includes a bevel gear commutator 700 fixedly mounted on the door leaf 2, a handwheel 701 installed at the front and rear ends of the bevel gear commutator 700, and a coupling 702 installed at the upper and lower output ends of the bevel gear commutator 700. Rotating the handwheel 701 causes the two couplings 702 to rotate through the bevel gear commutator 700. The two handwheels 701 are respectively located on the inner and outer sides of the door leaf 2. The handwheel 701 is installed in a detachable manner and is not installed when drive is not needed.

[0031] The linear drive assembly 71 includes a first support 710 fixedly mounted on the door leaf 2, a lead screw 711 rotatably mounted in the first support 710, a nut 712 dynamically connected to the lead screw 711, an adapter 713 fixedly mounted at one end of the nut 712, and a support frame 714 mounted on the end of the adapter 713. One end of the lead screw 711 is fixedly connected to the coupling 702, and the coupling 702 drives the lead screw to rotate, thereby causing the support frame 714 to move vertically through the nut 712.

[0032] The latch assembly 72 includes a second support 720 fixedly mounted on the door leaf 2 and a locking head 721 slidably mounted in the second support 720. One end of the locking head 721 is connected to the support frame 714. The support frame 714 drives the multiple locking heads 721 to rise and fall synchronously, and insert them into the locking seat 17 or the locking hole 18, or pull them out from the locking seat 17 and the locking hole 18. Four locking holes 18 are arranged at the bottom of each door leaf 2, and three locking seats 17 are arranged at the top of each door leaf 2. The position and number of the latch assembly 72 are adapted to the locking holes 18 or the locking seats 17.

[0033] like Figures 1 to 16 A rear anchored threshold-free double-leaf explosion-proof door installation method is shown, and the installation method includes the following steps: Step 1: pouring concrete: ensure the flatness and verticality of the front and side faces of the building structure, pour concrete and wait for the concrete to completely solidify and reach the designed strength; Step 2: Put the door frame 1 in place and temporarily fix it: 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: Install 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, hinge 6 installation: according to the design requirements, hinge 6 is installed on the door frame 1, and the position of hinge 6 is ensured to be accurate and firm. The installation of hinge 6 should meet the requirements of the opening and closing flexibility and stability of door leaf 2, and at the same time, the connection between hinge 6 and door frame 1 should be tight and not loose. Step 7: Install the door leaf 2: Connect the door leaf 2 to the door frame 1 through the hinge 6, 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 eight, debugging of door leaf 2: Debug the installed door leaf 2 to check whether it opens and closes flexibly, whether the seal is tight, and whether there are any abnormal sounds.

[0034] 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-anchored, threshold-free, double-leaf explosion-proof 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); a locking hole (18) is arranged on the lower horizontal support plate (13); the locking seat (17) and the locking hole (18) are arranged in a staggered manner; a double-sealed seam strip (15) is arranged on the upper rolled frame (10), the left rolled frame (11) and the right rolled frame (12); a middle seam sealing strip (4) is arranged between the two door leaves (2); and a bottom sealing strip (5) is arranged at the bottom of the door leaf (2); when the door leaf (2) is in a closed state, the double-sealed seam strip (15) is locked. 15), a middle seam sealing strip (4) and a bottom sealing strip (5) seal the gaps between the door leaf (2) and the door frame (1) and the two door leaves (2); a linkage locking component (7) is respectively installed on the two door leaves (2), and the linkage locking component (7) includes a driving component (70) installed on the door leaf (2), two linear driving components (71) with power installed at the upper and lower ends of the driving component (70), and a plurality of latch components (72) installed on the linear driving component (71), and the linear driving component (71) drives the latch component (72) to move vertically through the driving component (70) and is inserted into the locking seat (17) or the locking hole (18).

2. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 1 is characterized in that: The upper rolled frame (10) is fixedly mounted between the tops of the left rolled frame (11) and the right rolled frame (12), and the lower horizontal support plate (13) is fixedly mounted between the bottoms of the left rolled frame (11) and the right rolled frame (12); the upper rolled frame (10), the left rolled frame (11) and the right rolled frame (12) are all integrally formed from steel plates using a rolling process.

3. The rear-anchored threshold-free double-leaf explosion-proof 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-anchored threshold-free double-leaf explosion-proof door according to claim 3 is characterized by: The driving assembly (70) comprises a bevel gear commutator (700) fixedly mounted on the door leaf (2), a hand wheel (701) powered by power installed at the front and rear ends of the bevel gear commutator (700), and couplings (702) installed at the upper and lower output ends of the bevel gear commutator (700), wherein the hand wheel (701) is rotated to rotate the two couplings (702) via the bevel gear commutator (700).

5. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 4 is characterized in that: The linear drive assembly (71) comprises a first support (710) fixedly mounted on the door leaf (2), a lead screw (711) rotatably mounted in the first support (710), a nut (712) dynamically connected to the lead screw (711), a transition piece (713) fixedly mounted on one end of the nut (712), and a support frame (714) mounted on the end of the transition piece (713), one end of the lead screw (711) being fixedly connected to the coupling (702), the coupling (702) driving the lead screw (711) to rotate, and the support frame (714) is moved vertically via the nut (712).

6. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 5, characterized in that: The latch assembly (72) comprises a second support (720) fixedly mounted on the door leaf (2) and a locking head (721) slidably mounted in the second support (720); one end of the locking head (721) is connected to the support frame (714), and the support frame (714) drives a plurality of locking heads (721) to rise and fall synchronously.

7. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 1 or 6, characterized in that: Four locking holes (18) are arranged at the bottom of each door leaf (2), and three locking seats (17) are arranged at the top of each door leaf (2), and the position and number of the latch assembly (72) are adapted to the locking holes (18) or the locking seats (17).

8. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 1, characterized in that: The door leaf (2) comprises a steel frame (20) and a front panel (21) and a rear panel (22) wrapped around the outside of the steel frame (20); a reinforcing plate is fixedly mounted on one side of the door leaf (2); a wedge-shaped surface is arranged on the side where the two door leaves (2) are close to each other; a center seam sealing groove is arranged on the wedge-shaped surface; the center seam sealing strip (4) is installed in the center seam sealing groove; the steel frame (20) is fixed to the front panel (21) and the rear panel (22) by riveting; the steel frame (20) is formed by splicing vertically arranged horizontal steel beams and vertical steel beams.

9. The rear-anchored threshold-free double-leaf explosion-proof door according to claim 1, characterized in that: An anchor hole (3) is provided on the door frame (1), and a rear-bottomed anchor bolt is passed through the anchor hole (3) to fix the door frame (1); a sealing plug is also installed in the anchor hole (3), and the sealing plug shields the rear-bottomed anchor bolt.

10. A method for installing a rear-anchored threshold-free double-leaf explosion-proof 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, pour concrete 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: Anchoring the door frame (1): 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: Install 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: Install the hinge (6): Install the hinge (6) on the door frame (1), and ensure that the position of the hinge (6) is accurate and firm, and that the connection between the hinge (6) and the 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) via the hinge (6), 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).

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