Fireproof and explosion-proof civil defense air-tight door

Abstract

The invention relates to the technical field of civil defense, and discloses a fireproof and explosion-proof civil defense air-tight door which is characterized in that the inner side surface of a door frame is fixedly connected with a door frame fireproof sealing strip, the lower surface of the door frame is fixedly connected with a rotary doorsill mechanism, and the rotary doorsill mechanism comprises an embedded box body, a first supporting seat and a second supporting seat; the first supporting seat is connected with a first nut seat in a sliding mode through a sliding groove, 180-degree rotation is achieved through meshing with a first rack, a linkage shaft is driven by a driving shaft to rotate, a linkage lead screw installed on the second supporting seat rotates synchronously, a second nut seat moves downwards synchronously, and therefore when a second rotating tooth fork moves downwards, the second rotating tooth fork rotates synchronously. And rotation of 180 degrees is achieved through meshing of the first rack and the second rack, the positions of a flat pedal and a protective threshold in the rotary threshold mechanism are switched through the actions, and therefore the protective threshold is convenient to take and use when the civil air defense door is in the starting state, and daily passing of people and vehicles is facilitated through the flat pedal.

Description

Technical Field

[0001] The present invention relates to the technical field of civil air defense, and in particular to a fireproof and explosion-proof civil airtight door. Background Art

[0002] Civil air defense doors are the entrances and exits of civil defense projects. They are used by governments to mobilize and organize the public to implement air raid defense, disaster relief measures, and rescue operations to prevent and mitigate disaster damage. They are generally constructed of solid steel, providing a degree of shock wave protection and effectively ensuring the safety and stability of the civil air defense space.

[0003] The threshold structures of currently used civil air defense doors are divided into fixed thresholds and movable thresholds. Fixed thresholds are usually integrated with the door frame, while movable thresholds are removable. Both have certain shortcomings. The movable threshold is prone to loss because it can be removed separately. The fixed threshold is affected by the fixed threshold during daily use of the civil air defense passage, making it inconvenient for vehicles and personnel to pass through. Therefore, to address the above shortcomings, this solution proposes a fireproof and explosion-proof civil air defense airtight door. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art and provides a fireproof and explosion-proof airtight door for civil air defense. The door sill mechanism is rotated, and a worm is driven by a hand wheel, so that a worm wheel connected to the worm drives a driving shaft to rotate, so that a first nut seat mounted above a first support seat moves, and the first rotating tine fork rotates 180 degrees by engaging with the first rack while moving downward. The driving shaft drives a linkage shaft to rotate, so that a linkage screw rod mounted on a second support seat rotates synchronously, so that the second nut seat is synchronously moved downward, so that the second rotating tine fork rotates 180 degrees by engaging with the second rack while moving downward. The above actions enable the position of a flat pedal and a protective door sill in the rotating door sill mechanism to be switched, so that the protective door sill is conveniently retrieved and used when the civil air defense door is in an activated state, and the flat pedal facilitates daily passage of people and vehicles when the door is not in an activated state. The upright post provided at the connection between the door leaf and the door frame supports the weight of the door leaf itself, effectively preventing deformation of the door frame caused by long-term stress. The connection between the upright post, the top plate, and the ground effectively enhances the explosion-proof capability.

[0005] The present invention also provides the above-mentioned fireproof and explosion-proof personal airtight door, comprising: a door frame, an inner surface of the door frame being fixedly connected to a door frame fireproof sealing strip, a lower surface of the door frame being fixedly connected to a rotating threshold mechanism, the rotating threshold mechanism comprising an embedded box, a first support seat, and a second support seat, the first support seat being slidably connected to a first nut seat through a slide groove, the first nut seat being located on a side surface of the slide groove and being rotatably connected to a rotating support rod, the rotating support rod being located near one end of the first support seat and being fixedly connected to a first rotating tooth fork, the outer surface of the first support seat being fixedly connected to a first rack, the first rotating tooth fork being meshed with the first rack, the outer surface of the first support seat being fixedly connected to a first shaft seat, the first shaft seat being rotatably connected to a driving shaft, the outer surface of the driving shaft being provided with a thread, and the first nut seat being connected to a thread on the driving shaft through a screw nut; The cam is fixedly provided with a toothed connecting strip which is cooperatively connected with the toothed connecting strip of the cam, and the toothed connecting strip is connected with the toothed connecting strip of the cam. The left and right sides of the door leaf are fixedly provided with a handwheel disc frame, and the inside of the handwheel disc frame is detachably connected to the handwheel disc, and the center of the handwheel disc is provided with an outer hexagonal connector, and the outer surface of the wheel disc connector seat is provided with an inner hexagonal connector, and the outer hexagonal connector and the inner hexagonal connector are clamped with each other, and the outer surface of the door leaf is provided with a sealed groove.

[0006] According to the present invention, a fireproof and explosion-proof airtight door is provided, wherein the door lock mechanism includes a handle, an active arm, and a linkage rod. The handle is fixedly connected to one end of the active arm via a connecting shaft, and the other end of the active arm is rotatably connected to the linkage rod via a rotating shaft. The upper end of the linkage rod is connected to an upper movable lock bolt via a shaft, and the upper movable lock bolt is rotatably connected to the door leaf via a rotating shaft. The lower end of the linkage rod is connected to a lower movable lock bolt via a shaft, and the lower movable lock bolt is rotatably connected to the door leaf via a rotating shaft. The door lock mechanism allows the door leaf and door frame to be tightly coupled after the door is closed.

[0007] According to the present invention, a fireproof and explosion-proof airtight door for civil defense is provided, wherein the left and right inner surfaces of the door frame are provided with lock holes, the upper movable lock bolt is connected to the lock holes, and the lower movable lock bolt is connected to the lock holes, and fixing ears are fixedly connected to the upper surface and the left and right surfaces of the door frame. Through the provided lock holes, the upper and lower movable lock bolts installed on the door leaf are respectively inserted into the lock holes when closing, thereby achieving the effect of locking the civil defense door.

[0008] According to the present invention, a fireproof and explosion-proof airtight door for civil air defense is provided, wherein the upper end surface of the column is rotatably connected to a top bracket, and the lower end surface of the column is rotatably connected to a bottom bracket. The top bracket is connected to the top plate of the floor slab, and the bottom bracket is connected to the ground, thereby improving the strength of the civil air defense door and enhancing its explosion-proof capability.

[0009] According to the present invention, a fireproof and explosion-proof airtight door is provided. The upper surface of the inner box is hingedly connected to a movable cover. The left side of the inner box is fixedly connected to a second protective cover. The inner surface of the second protective cover is fixedly connected to a second support seat. The right side of the inner box is fixedly connected to a first protective cover. The inner surface of the first protective cover is fixedly connected to the first support seat. The opening of the movable cover effectively provides space for the rotating protective threshold to move. The first and second protective covers are respectively provided to effectively protect the movable components within.

[0010] According to a fireproof and explosion-proof personal airtight door provided by the present invention, the outer surface of the first support seat is fixedly connected to a first latch, the first latch is provided with two, the two first latches are respectively located at the upper and lower ends of the slide, the first rotating tine fork is respectively engaged with the two first latches, the outer surface of the second support seat is fixedly connected to a second latch, the second latch is provided with two, the two second latches are respectively located at the upper and lower ends of the slide, the second rotating tine fork is respectively engaged with the two second latches, the upper surfaces of the first support seat and the second support seat are both fixedly connected to baffles, the baffle on one side of the first support seat is rotatably connected to the active shaft, and the baffle on one side of the second support seat is rotatably connected to the upper end face of the linkage screw rod. The first latch is used to position the first rotating tine at the upper and lower positions, and similarly, the second latch is used to position the second rotating tine at the upper and lower positions.

[0011] According to the fireproof and explosion-proof airtight door provided by the present invention, a fireproof sealing strip for the protective threshold is fixedly connected to the side surface of the protective threshold, the fireproof sealing strip for the protective threshold is movably connected to the fireproof sealing strip for the door frame, the fireproof sealing strip for the door frame is movably connected to the sealing groove, and the fireproof sealing strip for the protective threshold is movably connected to the sealing groove. The connection between the fireproof sealing strip for the door frame and the sealing groove enables the airtightness of the airtight door to be achieved.

[0012] According to the fireproof and explosion-proof airtight door provided by the present invention, a linkage shaft protective cover is fixedly connected to the inner bottom wall of the embedded box, and the linkage shaft protective cover is fixedly connected to the linkage shaft seat. The linkage shaft protective cover is provided to effectively protect the linkage shaft seat and the linkage shaft.

[0013] Compared with the prior art, the fireproof and explosion-proof civil airtight door of the present invention rotates the threshold mechanism, drives the worm through the handwheel, and thus the worm gear connected to the worm drives the driving shaft to rotate, so that the first nut seat installed above the first support seat moves, and the first rotating tooth fork is rotated 180 degrees by engaging with the first rack while moving downward, and the linkage shaft is driven by the driving shaft to rotate, so that the linkage screw installed on the second support seat rotates synchronously, so that the second nut seat is moved downward synchronously, so that the second rotating tooth fork is rotated 180 degrees by engaging with the second rack while moving downward. Through the above actions, the position of the flat pedal and the protective threshold in the rotating threshold mechanism is switched, so that the protective threshold is conveniently retrieved and used when the civil airtight door is enabled, and when it is not enabled, the flat pedal is used to facilitate daily passage of people and vehicles.

[0014] Compared with the prior art, the fireproof and explosion-proof civil airtight door of the present invention supports the gravity of the door leaf itself through the columns arranged at the connection between the door leaf and the door frame, effectively avoiding deformation of the door frame caused by long-term stress, and effectively enhances its explosion-proof capability through the connection between the columns, the top plate and the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is an overall structural diagram of a fireproof and explosion-proof airtight door according to the present invention; Figure 2 A side view of a fireproof and explosion-proof airtight door for personal defense according to the present invention; Figure 3 This is a schematic structural diagram of a fireproof and explosion-proof airtight door of the present invention when the protective threshold is activated; Figure 4 This is a schematic diagram of a rotating threshold mechanism for a fireproof and explosion-proof airtight door according to the present invention; Figure 5 This is a schematic diagram of the internal structure of a rotating threshold mechanism of a fireproof and explosion-proof airtight door according to the present invention; Figure 6 This is a structural schematic diagram of the second rotating tine fork of a fireproof and explosion-proof airtight door of the present invention; Figure 7 This is a structural schematic diagram of the first rotating tine fork of a fireproof and explosion-proof airtight door of the present invention; Figure 8 The present invention is a schematic diagram of the cross-sectional structure of a door frame of a fireproof and explosion-proof airtight door.

[0016] Legend: 1. Door frame; 2. Door leaf; 3. Upright; 4. Top support; 5. Bottom support; 6. Heavy-duty hinge; 7. Sealed slot; 8. Door lock mechanism; 801. Handle; 802. Active arm; 803. Linkage rod; 804. Upper movable latch; 805. Lower movable latch; 9. Rotating threshold mechanism; 901. Flat pedal; 902. Movable cover; 903. Protective threshold; 904. Embedded box; 905. First protective cover; 906. Linkage shaft protective cover; 907. Second protective cover; 908. Baffle; 909. Active shaft; 910. Wheel connector; 911. Worm; 912. Worm wheel; 913. First nut seat; 914. A supporting seat; 915, a first shaft seat; 916, a linkage shaft seat; 917, a linkage shaft; 918, a first rotating tine fork; 919, a rotating support rod; 920, a fixing seat; 921, a connecting seat; 922, a fireproof sealing strip for the protective threshold; 923, a first rack; 924, a first latch; 925, a second supporting seat; 926, a second nut seat; 927, a linkage screw rod; 928, a second shaft seat; 929, a second rotating tine fork; 930, a second latch; 931, a second rack; 10, a fixing ear; 11, a fireproof sealing strip for the door frame; 12, a handwheel disc frame; 13, a lock hole; 14, a handwheel disc; 15, a gear groove; 16, a shaft groove. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0018] Reference Figure 1-8The embodiment of the present invention provides a fireproof and explosion-proof airtight door, which includes: a door frame 1, and a door frame fireproof sealing strip 11 is fixedly connected to the inner surface of the door frame 1. When a fire occurs, the door frame fireproof sealing strip 11 expands to seal the gap between the door and block the air circulation between the two spaces, effectively preventing the early smoke, toxic gases and heat from harming the human body and controlling the spread of the fire. The lower surface of the door frame 1 is fixedly connected to a rotating threshold mechanism 9, which includes an embedded box 904, a first support seat 914, and a second support seat 925. The first support seat 914 is slidably connected to a first nut seat 913 through a slide groove. The first nut seat 913 is located on one side of the slide groove and is rotatably connected to a rotating support rod 919. The end of the rotating support rod 919 close to the first support seat 914 is fixedly connected to a first rotating tine fork 918. The arc surface on one side of the first rotating tine fork 918 is provided with teeth that mesh with the first rack 923. The stroke of the first rotating tine fork 918 is just enough to effectively rotate one hundred and eighty degrees, and the first rotating tine fork 9 A U-shaped fork is provided on the other side of 18, and the outer surface of the first support seat 914 is fixedly connected to the first rack 923, and the first rotating tooth fork 918 is engaged with the first rack 923. The outer surface of the first support seat 914 is fixedly connected to the first shaft seat 915, and the driving shaft 909 is rotatably connected through the first shaft seat 915, wherein the connection between the driving shaft 909 and the first shaft seat 915 adopts a stepped shaft form, the purpose of which is to achieve rotation while enabling the first shaft seat 915 to support the driving shaft 909. The outer surface of the driving shaft 909 is provided with a thread, and the first nut seat 913 is connected to the thread on the driving shaft 909 through a screw nut.

[0019] The second support seat 925 is slidably connected to the second nut seat 926 through a sliding groove, and the second nut seat 926 is located on one side surface of the sliding groove and is rotatably connected to the rotating support rod 919. The rotating support rod 919 is fixedly connected to the second rotating tooth fork 929 at one end near the second support seat 925. The arc surface of one side of the second rotating tooth fork 929 is provided with teeth that mesh with the second rack 931. Its stroke just makes the second rotating tooth fork 929 effectively rotate one hundred and eighty degrees, and the other side of the second rotating tooth fork 929 is provided with a U-shaped fork. The outer surface of the second support seat 925 is fixedly connected to the second rack 931, and the second rack 931 meshes with the second rotating tooth fork 929. The second nut seat 926 is connected to the linkage screw rod 927 through a screw nut. The linkage screw rod 927 connected to the second nut seat 926 and the driving shaft 909 connected to the first nut seat 913 are assembled in the form of positive and negative screw threads. The purpose is to keep the moving directions of the first nut seat 913 and the second nut seat 926 consistent. The outer surface of the second support seat 925 is fixedly connected to the second shaft seat 928, and the second shaft seat 928 is rotatably connected to the linkage screw rod 927. The connection between the linkage screw rod 927 and the second shaft seat 928 adopts a stepped shaft connection form. Its function is to satisfy the rotation of the linkage screw rod 927 while enabling the second shaft seat 928 to support the linkage screw rod 927.

[0020] The left and right sides of the rotating support rod 919 are fixedly connected to the fixing seat 920, and the one side surface of the fixing seat 920 is fixedly connected to the flat pedal 901. When the flat pedal 901 is in use, its upper surface remains level with the ground, so as to facilitate the passage of pedestrians and vehicles. The other side surface of the fixed seat 920 is fixedly connected to a connecting seat 921, and one end of the connecting seat 921 is fixedly connected to the protective threshold 903. When the protective threshold 903 is in use, its height protrudes from the ground, and both sides are engaged with the bottom ends of the left and right sides of the door frame 1. The inner bottom wall of the embedded box 904 is fixedly connected to a linkage shaft seat 916, and the internal rotation of the linkage shaft seat 916 is connected to a linkage shaft 917. The power output by the driving shaft 909 is effectively transmitted to one side of the linkage screw rod 927 through the linkage shaft 917. One end of the linkage shaft 917 is connected to the driving shaft 909 through a right-angle transmission gear set, and the other end of the linkage shaft 917 is connected to the linkage screw rod 927 through a right-angle transmission gear set. The right-angle transmission gear set used at both ends of the linkage shaft 917 has a speed ratio of one to one, and its function is to achieve the same speed.

[0021] A gear groove 15 is provided inside the right side of the door frame 1, and an axis groove 16 is provided inside the right side of the door frame 1. The axis groove 16 is communicated with the gear groove 15, and the gear groove 15 is rotatably connected to a worm 911. The driving shaft 909 is located inside the axis groove 16, and the upper end face of the driving shaft 909 is fixedly connected to a worm wheel 912, which is located inside the gear groove 15. The worm wheel 912 and the worm 911 are meshed with each other. One end of the worm 911 is fixedly connected to a wheel connecting seat 910, and the left side of the door frame 1 is fixedly connected to a connecting arm, which is rotatably connected to a column 3. The upper end face of the column 3 is rotatably connected to a top support 4, which forms a support with the lower surface of the floor slab through the top support 4 and is fixed by bolts. The lower end face of the column 3 is rotatably connected to a bottom support 5, which forms a support with the ground through the bottom support 5 and is fixed by bolts. A heavy-duty hinge 6 is fixedly connected to the outer surface of the column 3 , and a door leaf 2 is hinged to the column 3 via the heavy-duty hinge 6 . The door leaf 2 is made of cast iron and coated with heat-resistant concrete. Door lock mechanisms 8 are provided on the left and right sides of the outer surface of the door leaf 2. The outer surface of the door leaf 2 is fixedly connected to a handwheel disc frame 12. The inside of the handwheel disc frame 12 is detachably connected to a handwheel disc 14. An external hexagonal connector is provided at the center of the handwheel disc 14. The outer surface of the wheel disc connecting seat 910 is provided with an internal hexagonal connector. The external hexagonal connector and the internal hexagonal connector are engaged with each other. The wheel disc connecting seat 910 is set on the right side frame of the door frame 1, and the end of the internal hexagonal connector is flush with the surface of the door frame 1. A closed groove 7 is provided on the outer surface of the door leaf 2. Lock holes 13 are provided on the left and right inner surfaces of the door frame 1. The upper movable lock bolt 804 is connected to the lock hole 13, and the lower movable lock bolt 805 is connected to the lock hole 13. The upper surface and left and right side surfaces of the door frame 1 are fixedly connected with fixing ears 10. The fixing ears 10 enable the door frame 1 to be better combined with the poured concrete during installation.

[0022] The door lock mechanism 8 includes a handle 801, an active arm 802, and a linkage rod 803. The handle 801 is fixedly connected to one end of the active arm 802 through a connecting shaft, and the other end of the active arm 802 is rotatably connected to the linkage rod 803 through a rotating shaft. The upper end of the linkage rod 803 is connected to an upper movable lock bolt 804 through a shaft, and the upper movable lock bolt 804 is rotatably connected to the door leaf 2 through a rotating shaft. The lower end of the linkage rod 803 is connected to a lower movable lock bolt 805 through a shaft, and the lower movable lock bolt 805 is rotatably connected to the door leaf 2 through a rotating shaft.

[0023] The upper surface of the embedded box 904 is hinged with a movable cover 902, and the movable cover 902 is located on the movable side of the door leaf 2. The left surface of the embedded box 904 is fixedly connected to the second protective cover 907, and the inner surface of the second protective cover 907 is fixedly connected to the second support seat 925. The right surface of the embedded box 904 is fixedly connected to the first protective cover 905, and the inner surface of the first protective cover 905 is fixedly connected to the first support seat 914. The outer surface of the first support seat 914 is fixedly connected to a first bolt 924, and the first bolt 924 is provided with two, and the two first bolts 924 are respectively located at the upper and lower ends of the slide, and the first rotating tooth fork 918 is respectively engaged with the two first bolts 924, and the outer surface of the second support seat 925 is fixedly connected to a second bolt 930, and the second bolt 930 is provided with two, and the two second bolts 930 are respectively located at the upper and lower ends of the slide, and the second rotating tooth fork 929 is respectively engaged with the two second bolts 930. The upper surfaces of the first support seat 914 and the second support seat 925 are fixedly connected to a baffle 908, and the baffle 908 located on one side of the first support seat 914 is rotatably connected to the driving shaft 909, and the baffle 908 located on the side of the second support seat 925 is rotatably connected to the upper end surface of the linkage screw rod 927.

[0024] The side surface of the protective threshold 903 is fixedly connected with a protective threshold fireproof sealing strip 922, the protective threshold fireproof sealing strip 922 is movably connected to the door frame fireproof sealing strip 11, the door frame fireproof sealing strip 11 is movably connected to the closed groove 7, the protective threshold fireproof sealing strip 922 is movably connected to the closed groove 7, and the inner bottom wall of the embedded box 904 is fixedly connected with a linkage shaft protective cover 906, and the linkage shaft protective cover 906 is fixedly connected to the linkage shaft seat 916.

[0025] Working principle: When in use, manually open the movable cover 902, remove the handwheel disc 14 fixed on the handwheel disc frame 12, and connect the outer hexagonal connector on the handwheel disc 14 and the inner hexagonal connector on the wheel disc connecting seat 910 to each other, and rotate the handwheel disc 14 clockwise. At this time, the worm 911 drives the worm wheel 912 to rotate, thereby causing the driving shaft 909 to rotate. When the driving shaft 909 rotates, the linkage shaft 917 rotates synchronously through the right-angle gear set. The other end of the linkage shaft 917 is connected to the linkage screw rod 927 through the right-angle gear set, thereby causing the linkage screw rod 927 to rotate synchronously. When the driving shaft 909 rotates, the first nut seat 913 connected to the driving shaft 909, through the screw nut and the thread set on the driving shaft 909, realizes the downward movement of the first nut seat 913, and at this time, the second nut seat 926 connected to the linkage screw rod 927 realizes the synchronous downward movement.

[0026] When the first nut seat 913 and the second nut seat 926 move downward synchronously, the rotating strut 919 connected between the first nut seat 913 and the second nut seat 926 follows and moves downward. At this time, the flat pedal 901 installed on the fixed seat 920 causes the protective threshold 903 installed on the fixed seat 920 to move downward synchronously through the connecting seat 921, and the first rotating tine fork 918 and the second rotating tine fork 929 installed on both sides of the rotating strut 919, their U-shaped fork parts disengage from the first bolt 924 and the second bolt 930 respectively as they move downward.

[0027] When the first rotating tine fork 918 and the second rotating tine fork 929 are disengaged from the first bolt 924 and the second bolt 930 respectively, the engaging teeth on the first rotating tine fork 918 engage with the first rack 923, and the engaging teeth on the second rotating tine fork 929 engage with the second rack 931. As the first nut seat 913 and the second nut seat 926 continue to move downward, the first rotating tine fork 918 and the second rotating tine fork 929 rotate, and through the set number of teeth and movable stroke, the rotation angle of the first rotating tine fork 918 and the second rotating tine fork 929 is one hundred and eighty degrees.

[0028] As the first rotating tine fork 918 and the second rotating tine fork 929 rotate, the flat pedal 901 and the protective threshold 903 rotate, and the upper and lower positions of the two in the embedded box 904 are interchanged. When the first rotating tine fork 918 and the second rotating tine fork 929 complete a one hundred and eighty degree rotation, the engaging teeth on the first rotating tine fork 918 and the second rotating tine fork 929 are disengaged from the first rack 923 and the second rack 931 respectively. When the first rotating tine fork 918 and the first rack 923 are disengaged, the U-shaped fork portion on the first rotating tine fork 918 is docked with the other first bolt 924. Similarly, after the second rotating tine fork 929 and the second rack 931 are disengaged, the U-shaped fork portion on the second rotating tine fork 929 is docked with the other second bolt 930.

[0029] Stop rotating the handwheel 14, remove it, install it back on the handwheel frame 12, cover the movable cover 902, push the door leaf 2 to close it, and then the door frame fireproof sealing strip 11 installed on the door frame 1 and the protective threshold fireproof sealing strip 922 installed on the protective threshold 903 are respectively connected to the closed groove 7, and finally the door leaf 2 is locked by pulling the door lock mechanism 8.

[0030] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A fireproof and explosion-proof airtight door, characterized in that: include: A door frame (1), wherein the inner surface of the door frame (1) is fixedly connected to a door frame fireproof sealing strip (11), and the lower surface of the door frame (1) is fixedly connected to a rotating threshold mechanism (9), wherein the rotating threshold mechanism (9) comprises an embedded box (904), a first support seat (914), and a second support seat (925), wherein the first support seat (914) is slidably connected to a first nut seat (913) through a sliding groove, and the first nut seat (913) is rotatably connected to a rotating support rod (919) on a side surface of the sliding groove, and the rotating support rod (919) is close to the first support seat ( 914), one end of the first support seat (914) is fixedly connected to a first rotating tooth fork (918), the outer surface of the first support seat (914) is fixedly connected to a first rack (923), the first rotating tooth fork (918) is meshed with the first rack (923), the outer surface of the first support seat (914) is fixedly connected to a first shaft seat (915), the first shaft seat (915) is rotatably connected to a driving shaft (909), the outer surface of the driving shaft (909) is provided with a thread, and the first nut seat (913) is connected to the thread on the driving shaft (909) through a screw nut; The second support seat (925) is slidably connected to the second nut seat (926) through the slide groove, the second nut seat (926) is located on a side surface of the slide groove and is rotatably connected to the rotating support rod (919), the rotating support rod (919) is fixedly connected to the second rotating tooth fork (929) at one end close to the second support seat (925), the outer surface of the second support seat (925) is fixedly connected to the second rack (931), the second rack (931) is engaged with the second rotating tooth fork (929), the second nut seat (926) is connected to the linkage screw rod (927) through the screw nut, the outer surface of the second support seat (925) is fixedly connected to the second shaft seat (928), and the second shaft seat (928) is rotatably connected to the linkage screw rod (927); The left and right sides of the rotating support rod (919) are fixedly connected to fixed seats (920), one side surface of the fixed seat (920) is fixedly connected to a flat pedal (901), the other side surface of the fixed seat (920) is fixedly connected to a connecting seat (921), one end of the connecting seat (921) is fixedly connected to a protective threshold (903), the inner bottom wall of the embedded box (904) is fixedly connected to a linkage shaft seat (916), the interior of the linkage shaft seat (916) is rotatably connected to a linkage shaft (917), one end of the linkage shaft (917) is connected to the driving shaft (909) via a right-angle transmission gear set, and the other end of the linkage shaft (917) is connected to a linkage screw rod (927) via a right-angle transmission gear set; A gear groove (15) is provided inside the right side of the door frame (1), and an axis groove (16) is provided inside the right side of the door frame (1), the axis groove (16) is connected to the gear groove (15), and a worm (911) is rotatably connected inside the gear groove (15), the driving shaft (909) is located inside the axis groove (16), and a worm wheel (912) is fixedly connected to the upper end face of the driving shaft (909), and the worm wheel (912) is located inside the gear groove (15), and the worm wheel (912) and the worm (911) are meshed with each other, and one end of the worm (911) is fixedly connected to a wheel connecting seat (910), and a connecting arm is fixedly connected to the left side of the door frame (1). The connecting arm is rotatably connected to a column (3), the outer surface of the column (3) is fixedly connected to a heavy hinge (6), the column (3) is hinged to a door leaf (2) through the heavy hinge (6), the outer surface of the door leaf (2) is provided with a door lock mechanism (8) on both sides, the outer surface of the door leaf (2) is fixedly connected to a hand wheel frame (12), the interior of the hand wheel frame (12) is detachably connected to a hand wheel disc (14), the center of the hand wheel disc (14) is provided with an outer hexagonal connector, the outer surface of the wheel disc connecting seat (910) is provided with an inner hexagonal connector, the outer hexagonal connector and the inner hexagonal connector are mutually engaged, and the outer surface of the door leaf (2) is provided with a closed groove (7).

2. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: The door lock mechanism (8) comprises a handle (801), an active arm (802), and a linkage rod (803); the handle (801) is fixedly connected to one end of the active arm (802) via a connecting shaft; the other end of the active arm (802) is rotationally connected to the linkage rod (803) via a rotating shaft; the upper end of the linkage rod (803) is connected to an upper movable lock bolt (804) via a shaft; the upper movable lock bolt (804) is rotationally connected to the door leaf (2) via a rotating shaft; the lower end of the linkage rod (803) is connected to a lower movable lock bolt (805) via a shaft; the lower movable lock bolt (805) is rotationally connected to the door leaf (2) via a rotating shaft.

3. The fireproof and explosion-proof airtight door according to claim 2, characterized in that: The left and right inner surfaces of the door frame (1) are both provided with lock holes (13), the upper movable lock bolt (804) is connected to the lock hole (13), and the lower movable lock bolt (805) is connected to the lock hole (13). The upper surface and the left and right side surfaces of the door frame (1) are both fixedly connected with fixing ears (10).

4. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: The upper end surface of the column (3) is rotatably connected to a top support (4), and the lower end surface of the column (3) is rotatably connected to a bottom support (5).

5. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: The upper surface of the embedded box (904) is hinged with a movable cover (902), the left surface of the embedded box (904) is fixedly connected to a second protective cover (907), the inner surface of the second protective cover (907) is fixedly connected to a second support seat (925), the right surface of the embedded box (904) is fixedly connected to a first protective cover (905), and the inner surface of the first protective cover (905) is fixedly connected to a first support seat (914).

6. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: The outer surface of the first support seat (914) is fixedly connected with a first clamping bolt (924), and the first clamping bolt (924) is provided with two, and the two first clamping bolts (924) are respectively located at the upper and lower ends of the slide groove, and the first rotating tooth fork (918) is respectively engaged with the two first clamping bolts (924). The outer surface of the second support seat (925) is fixedly connected with a second clamping bolt (930), and the second clamping bolt (930) is provided with two, and the two second clamping bolts (930) are respectively located at the upper and lower ends of the slide groove, and the second rotating tooth fork (929) is respectively engaged with the two second clamping bolts (930). The upper surfaces of the first support seat (914) and the second support seat (925) are both fixedly connected with a baffle (908), and the baffle (908) located on one side of the first support seat (914) is rotatably connected to the driving shaft (909), and the baffle (908) located on one side of the second support seat (925) is rotatably connected to the upper end surface of the linkage screw rod (927).

7. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: The side surface of the protective threshold (903) is fixedly connected to a protective threshold fireproof sealing strip (922), the protective threshold fireproof sealing strip (922) is movably connected to the door frame fireproof sealing strip (11), the door frame fireproof sealing strip (11) is movably connected to the closed groove (7), and the protective threshold fireproof sealing strip (922) is movably connected to the closed groove (7).

8. The fireproof and explosion-proof airtight door according to claim 1, characterized in that: A linkage shaft protective cover (906) is fixedly connected to the inner bottom wall of the embedded box (904), and the linkage shaft protective cover (906) is fixedly connected to the linkage shaft seat (916).

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