CN213774999U

CN213774999U - Sealing beam of steel structure movable threshold double-leaf protective airtight door

Info

Publication number: CN213774999U
Application number: CN202022428288.6U
Authority: CN
Inventors: 谢健
Original assignee: Anhui Longhong Civil Air Defense Engineering Protection Equipment Co ltd
Current assignee: Anhui Longhong Civil Air Defense Engineering Protection Equipment Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-07-23
Anticipated expiration: 2030-10-26

Abstract

The application relates to a sealing beam of a steel structure movable threshold double-leaf protective airtight door, which comprises an overturning beam rotationally connected to the bottom of the back of a door leaf, wherein the overturning beam comprises a bottom plate and a side plate which are perpendicular to each other, the bottom wall of the bottom plate is provided with two baffle plates which are arranged at intervals, an installation groove is formed between the two baffle plates, and a first sealing rubber strip is arranged in the installation groove of the bottom plate; the bottom plate is provided with an installation mechanism for installing a first sealing rubber strip, the inner side walls, opposite to the two baffles, are provided with chutes, the installation mechanism comprises a limiting plate connected in the chutes of the baffles in a sliding manner, one end, far away from the first sealing rubber strip, of the limiting plate is fixedly connected with a rack, a containing cavity is formed in the baffle, a first rotating shaft perpendicular to the bottom plate is rotatably connected in the containing cavity of the baffle, one end, close to the limiting plate, of the first rotating shaft is fixedly connected with a rotating gear, and the rotating gear is meshed with the rack; the bottom plate is also provided with a transmission assembly for driving the first rotating shaft to rotate. This application can alleviate the damage that joint strip and ground friction received.

Description

Sealing beam of steel structure movable threshold double-leaf protective airtight door

Technical Field

The application relates to the technical field of civil air defense door sealing, in particular to a sealing beam of a steel structure movable threshold double-leaf protective airtight door.

Background

The civil air defense door is civil air defense equipment which is used for protecting the safety of personnel or material equipment in civil air defense engineering when a nuclear weapon, a conventional weapon or a biochemical weapon explodes in wartime, mainly plays a role in preventing shock waves, fragments and toxic gases, and has performance indexes mainly including resistance level and sealing performance. The civil air defense door sill is one of important parts of the civil air defense door and plays a role in bearing the pressure of a door leaf and sealing. For civil air defense projects such as underground garages and the like needing to be provided with access, if the civil air defense threshold is set to be a fixed threshold, the access of vehicles or equipment can be influenced. In order to solve the problem, a turnover sealing beam mechanism is generally adopted, and after the door leaf is closed and locked, the sealing beam is manually operated to turn over so as to seal a gap between the door leaf and the ground.

The related technology can refer to the Chinese utility model patent with the publication number of CN209742695U, which discloses a civil underground comprehensive pipe gallery communicating port composite material civil air defense protective device, comprising a door leaf, a door frame, a lock, a hinge and a sealing beam lifting mechanism, wherein the door leaf is hinged with the door frame through the hinge, the lock is arranged on the door leaf, the sealing beam lifting mechanism is arranged on the side wall of the door leaf, the lower part of the sealing beam lifting mechanism is provided with an overturning beam and a rubber strip groove, the rubber strip groove is arranged at the bottom of the overturning beam and fixedly connected with a sealing rubber strip for realizing the sealing between the passage terrace and the door leaf; the door leaf is also provided with an embedded part, and the locking part and the hinge are connected with the embedded part through bolts, so that the connection between the door leaf and the door frame is realized.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: under the normal condition, the turnover beam is closed, and the sealing rubber strip fixed at the bottom of the turnover beam is rubbed with the ground to cause damage, so that the sealing performance of the sealing rubber strip is influenced.

SUMMERY OF THE UTILITY MODEL

In order to alleviate the damage that joint strip and ground friction received, this application provides a sealing beam of steel construction threshold biparting protective airtight door that lives.

The application provides a pair of steel construction threshold biparting protective airtight door's sealed roof beam adopts following technical scheme:

the sealing beam of the steel structure movable threshold double-leaf protective airtight door comprises an overturning beam which is rotatably connected to the bottom of the back of a door leaf, wherein the overturning beam comprises a bottom plate and a side plate which are perpendicular to each other, two baffles which are arranged at intervals are arranged on the bottom wall of the bottom plate, an installation groove is formed between the two baffles, and a first sealing rubber strip is arranged in the installation groove of the bottom plate; the bottom plate is provided with an installation mechanism for installing a first sealing rubber strip, the inner side walls of the two baffles opposite to each other are provided with sliding grooves, the installation mechanism comprises a limiting plate connected in the sliding grooves of the baffles in a sliding manner, one end, far away from the first sealing rubber strip, of the limiting plate is fixedly connected with a rack, a containing cavity is formed in each baffle, a first rotating shaft perpendicular to the bottom plate is rotatably connected in the containing cavity of each baffle, one end, close to the limiting plate, of the first rotating shaft is fixedly connected with a rotating gear, and the rotating gear is meshed with the rack; the bottom plate is also provided with a transmission assembly for driving the first rotating shaft to rotate.

Through adopting above-mentioned technical scheme, when needs install first joint strip in the diapire of upset roof beam, operating personnel extrudees first joint strip into the mounting groove of bottom plate earlier, first joint strip is in by compression state this moment, operating personnel makes first axis of rotation rotate through drive assembly after that, first axis of rotation drive rolling gear rotates, rolling gear rotates drive rack and drives the limiting plate and remove to the direction that is close to first joint strip to compress first joint strip into in the mounting groove of bottom plate. Because first joint strip compression is in the mounting groove of bottom plate, operating personnel is closing the in-process of upset roof beam, first joint strip not with ground contact, so can not cause the damage with ground friction. When the sealing beam is in a closed state, an operator makes the first rotating shaft rotate reversely through the transmission assembly to drive the rotating gear to rotate reversely, the rotating gear rotates reversely to drive the rack to move to drive the limiting plate to reset into the sliding groove of the baffle plate, and the first sealing rubber strip recovers deformation to seal a gap between the turnover beam and the ground.

Preferably, an installation cavity communicated with the accommodating cavities of the two baffles is formed in the bottom plate, the transmission assembly comprises a second rotating shaft which is rotatably connected in the installation cavity of the bottom plate, first bevel gears are fixedly sleeved at two ends of the second rotating shaft, second bevel gears are fixedly sleeved at one ends of the first rotating shaft, which are far away from the rotating gears, and the first bevel gears are meshed with the second bevel gears; and the bottom plate is also provided with a driving assembly for driving the second rotating shaft to rotate.

Through adopting above-mentioned technical scheme, when needs make first axis of rotation take place to rotate, operating personnel makes the second axis of rotation rotate through drive assembly, and two first bevel gears of second axis of rotation drive rotate simultaneously, and two first bevel gears of two simultaneous rotation drives two second bevel gears rotate simultaneously, and two first axis of rotation of two simultaneous rotation drives of two second bevel gears rotate simultaneously. The two first rotating shafts can be driven to rotate simultaneously by rotating the second rotating shaft, and the operation is convenient.

Preferably, drive assembly connects in the third axis of rotation of bottom plate roof including rotating, the roof that the one end of third axis of rotation runs through the bottom plate extends to the installation intracavity of bottom plate and the rigid coupling has the worm, the other end rigid coupling of third axis of rotation has the knob, the second axis of rotation cover is established and is fixed with the worm wheel, worm wheel and worm meshing.

Through adopting above-mentioned technical scheme, when needs make the second axis of rotation rotate, operating personnel rotates the knob and makes the third axis of rotation rotate, and the third axis of rotation rotates the drive worm and rotates, and the worm rotates the drive worm wheel and rotates, and the worm wheel rotates the drive second axis of rotation and rotates.

Preferably, one end of the first sealing rubber strip, which is close to the bottom plate, is provided with a wavy telescopic part.

Through adopting above-mentioned technical scheme, when two limiting plates butt when bottom plate was kept away from to the one end at first joint strip, first joint strip pars contractilis was in by the compression state, after the limiting displacement that first joint strip breaks away from two limiting plates, first joint strip pars contractilis recovered deformation and supports first joint strip tightly subaerial.

Preferably, the first sealing rubber strip is hollow inside, and one end of the first sealing rubber strip, which is far away from the bottom plate, is provided with an arc-shaped part extending towards the direction far away from the bottom plate.

Through adopting above-mentioned technical scheme, when first joint strip supports tightly between ground and bottom plate, first joint strip's arc portion receives the extrusion on ground and warp to the hollow inside of first joint strip to extrude first joint strip and extend to the direction that is close to two baffles, and then improve the sealed effect between two baffles and the ground.

Preferably, the door leaf is further provided with a turnover mechanism for driving the turnover beam to turn over, the side wall of the back of the door leaf is fixedly connected with a hinged support, a rocker is hinged on the hinged support, and one end, far away from the hinged support, of the rocker is fixedly connected with the turnover beam; the turnover mechanism comprises an inverted L-shaped vertical connecting rod, a crank, a transmission shaft, a reversing transmission and a first handle, the reversing transmission is mounted on the side wall of the back face of the door leaf, one end of the first handle is fixed on the input end of the reversing transmission, the output end of the reversing transmission is connected with the transmission shaft, the transmission shaft is rotatably connected to the side wall of the door leaf, the crank is sleeved on the outer side wall fixed on the transmission shaft, the other end of the crank is hinged to the upper end of the inverted L-shaped vertical connecting rod, and the lower end of the inverted L-shaped vertical connecting rod is hinged to a rocker.

Through adopting above-mentioned technical scheme, when needs make the upset roof beam upset, the operating personnel rotates the first in command, and the work of first in command rotation drive switching-over derailleur, and the output drive transmission shaft of switching-over derailleur rotates, and the transmission shaft rotates the drive crank and rotates, thereby crank rotation drives the vertical connecting rod of falling L shape and removes and drive the rocker rotation, and the rocker rotates and drives the upset roof beam and overturn.

Preferably, a second handle is arranged on the side wall of the front face of the door leaf, and the second handle and the first handle are coaxially arranged.

Through adopting above-mentioned technical scheme, the setting of second handle is convenient for operating personnel also can drive the upset roof beam and overturn outdoors.

Preferably, a groove is formed in the side wall, close to the door leaf, of the side plate, a second sealing rubber strip is arranged in the groove of the side plate, and an embedding pressing strip used for tightly abutting against the second sealing rubber strip is fixedly connected to the side wall, close to the side plate, of the door leaf.

Through adopting above-mentioned technical scheme, when the upset roof beam was in the closed condition, curb plate and door leaf were parallel to each other this moment, and the layering was supported tightly second joint strip between curb plate and door leaf to inlay this moment to improve the sealing performance between curb plate and the door leaf.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when needs install first joint strip in the diapire of upset roof beam, operating personnel will be first joint strip extrudeed into the mounting groove of bottom plate earlier, and first joint strip is in by compression state this moment, and operating personnel makes first axis of rotation rotate through drive assembly after that, and first axis of rotation drive rotating gear rotates, and rotating gear rotates drive rack and drives the limiting plate and remove to the direction that is close to first joint strip to compress first joint strip in the mounting groove of bottom plate. Because first joint strip compression is in the mounting groove of bottom plate, operating personnel is closing the in-process of upset roof beam, first joint strip not with ground contact, so can not cause the damage with ground friction. When the sealing beam is in a closed state, an operator enables the first rotating shaft to rotate reversely through the transmission assembly to drive the rotating gear to rotate reversely, the rotating gear rotates reversely to drive the rack to move so as to drive the limiting plate to reset into the sliding groove of the baffle, and the first sealing rubber strip restores to deform so as to seal a gap between the overturning beam and the ground;

2. when the two limiting plates abut against one end, far away from the bottom plate, of the first sealing rubber strip, the telescopic part of the first sealing rubber strip is in a compressed state, and after the first sealing rubber strip is separated from the limiting effect of the two limiting plates, the telescopic part of the first sealing rubber strip recovers deformation to abut against the first sealing rubber strip on the ground;

3. when first joint strip supports tightly between ground and bottom plate, first joint strip's arc portion receives the extrusion on ground to the hollow inside deformation of first joint strip to extrude first joint strip and extend to the direction that is close to two baffles, thereby improve the sealed effect between two baffles and the ground.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a schematic structural diagram of the turnover mechanism in the embodiment of the present application.

FIG. 3 is a partial cross-sectional view of a mounting mechanism in an embodiment of the present application.

Description of reference numerals: 1. a door leaf; 11. embedding a pressing strip; 2. turning over the beam; 21. a base plate; 211. a baffle plate; 2111. a chute; 2112. an accommodating chamber; 212. mounting grooves; 213. a mounting cavity; 22. a side plate; 221. a groove; 3. a turnover mechanism; 31. an inverted L-shaped vertical connecting rod; 32. a crank; 33. a drive shaft; 34. a reversing gear box; 35. a first handle; 36. a second handle; 37. hinging seat; 38. a rocker; 4. an installation mechanism; 41. a limiting plate; 42. a rack; 43. a rotating gear; 44. a first rotating shaft; 45. a transmission assembly; 451. a second rotating shaft; 452. a first bevel gear; 453. a second bevel gear; 46. a drive assembly; 461. a third rotating shaft; 462. a worm; 463. a worm gear; 464. a knob; 51. a first sealing rubber strip; 511. a telescopic part; 512. an arc-shaped portion; 52. and a second sealing rubber strip.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses sealing beam of steel construction threshold biparting protective airtight door. Referring to fig. 1, the sealing beam of the steel structure movable threshold double-leaf protective airtight door comprises an overturning beam 2 and an overturning mechanism 3. Taking a single door leaf 1 as an example, the turning beam 2 is rotatably connected to the side wall on the back side of the door leaf 1, the turning beam 2 comprises a bottom plate 21 and a side plate 22 which are perpendicular to each other, a first sealing rubber strip 51 is installed on the bottom wall of the bottom plate 21, and a second sealing rubber strip 52 is installed on the side plate 22 close to the side wall of the door leaf 1.

Referring to fig. 1 and 2, the turnover mechanism 3 is used to turn over the turnover beam 2, thereby achieving opening and closing of the turnover beam 2. The turnover mechanism 3 comprises an inverted L-shaped vertical connecting rod 31, a crank 32, a transmission shaft 33, a reversing speed changer 34, a first handle 35, a second handle 36, a hinged support 37 and a rocker 38, the reversing speed changer 34 is arranged on the side wall of the back surface of the door leaf 1, one end of the first handle 35 is fixed at the input end of the reversing speed changer 34, the transmission shaft 33 is rotatably connected with the side wall of the back surface of the door leaf 1 through a bearing, one end of the transmission shaft 33 is fixed at the output end of the reversing speed changer 34, one end of the crank 32 is sleeved and fixed on the transmission shaft 33, the other end of the crank 32 is hinged to the inverted L-shaped vertical connecting rod 31, the hinged support 37 is installed on the side wall of the back face of the door leaf 1, the rocker 38 is provided with three end portions, one end, close to the door leaf 1, of the rocker 38 is hinged to the hinged support 37, one end, close to the turnover beam 2, of the rocker 38 is welded to the side plate 22, and one end, far away from the turnover beam 2, of the rocker 38 is hinged to the inverted L-shaped vertical connecting rod 31. In order to facilitate the operator to turn the turnover beam 2 outside the door, the second handle 36 is disposed on the side wall of the front side of the door leaf 1, and the first handle 35 is coaxially connected with the second handle 36.

When the turnover beam 2 needs to be driven to turn over, an operator rotates the first handle 35 to drive the reversing speed changer 34 to work, the output end of the reversing speed changer 34 drives the transmission shaft 33 to rotate, the transmission shaft 33 rotates to drive the crank 32 to rotate, the crank 32 rotates to drive the inverted L-shaped vertical connecting rod 31 to move, and the rocker 38 rotates under the combined action of the inverted L-shaped vertical connecting rod 31 and the hinged support 37 to drive the turnover beam 2 to turn over, so that the turnover beam 2 is opened and closed. The operation of the second handle 36 is the same and will not be described in detail.

Referring to fig. 3, the bottom wall of the bottom plate 21 is provided with two baffle plates 211, the two baffle plates 211 are arranged at intervals, a mounting groove 212 is formed between the two baffle plates 211, and the mounting groove 212 of the bottom plate 21 is used for mounting the first sealant strip 51. The bottom plate 21 is provided with an installation mechanism 4 for installing the first sealing rubber strip 51, the inner side walls of the two baffles 211 which are opposite to each other are provided with sliding grooves 2111, the two sliding grooves 2111 are arranged in a collinear manner, and the extension direction of the two sliding grooves 2111 is perpendicular to the baffles 211. The mounting mechanism 4 includes two limiting plates 41, a rack 42, a rotating gear 43, a first rotating shaft 44, a transmission assembly 45 and a driving assembly 46, where each limiting plate 41 slides in the sliding slot 2111 along a direction perpendicular to the baffle 211, and the rack 42 is fixedly connected to one end of the limiting plate 41 away from the first sealing rubber strip 51. An accommodating cavity 2112 is formed in each baffle 211, the first rotating shaft 44 is rotatably connected to the inner wall of the accommodating cavity 2112 of the baffle 211 through a bearing, the first rotating shaft 44 is perpendicular to the bottom plate 21, the rotating gear 43 is fixedly sleeved on one end of the first rotating shaft 44 close to the rack 42, and the rotating gear 43 is meshed with the rack 42.

Referring to fig. 3, a mounting cavity 213 is formed in the bottom plate 21, and the mounting cavity 213 communicates with the accommodating cavities 2112 of the two baffle plates 211. The transmission assembly 45 is used for driving the two first rotating shafts 44 to rotate simultaneously, the transmission assembly 45 comprises a second rotating shaft 451, a first bevel gear 452 and a second bevel gear 453, the second rotating shaft 451 is rotatably connected to the inner wall of the mounting cavity 213 of the bottom plate 21 through a bearing, and the axial direction of the second rotating shaft 451 is parallel to the bottom plate 21. The number of the first bevel gears 452 is two, and the two first bevel gears 452 are respectively sleeved and fixed at two ends of the second rotating shaft 451. Two second bevel gears 453 are provided, the second bevel gears 453 are fixed to one end of the first rotating shaft 44 away from the rotating gear 43, and the first bevel gear 452 and the second bevel gears 453 are engaged.

Referring to fig. 3, the driving assembly 46 is configured to drive the second rotating shaft 451 to rotate, the driving assembly 46 includes a third rotating shaft 461, a worm 462, a worm wheel 463 and a knob 464, the third rotating shaft 461 is rotatably connected to the top wall of the bottom plate 21 through a bearing, one end of the third rotating shaft 461 extends into the mounting cavity 213 of the bottom plate 21 through the top wall of the bottom plate 21 and is fixedly connected to the worm 462, and the knob 464 is fixedly connected to one end of the third rotating shaft 461, which is far away from the worm 462. The worm wheel 463 is fitted and fixed to the circumferential side wall of the rotation shaft, and the worm wheel 463 meshes with the worm 462.

Referring to fig. 3, in order to improve the sealing performance between the bottom plate 21 and the ground, a wavy expansion portion 511 is disposed at one end of the first sealing rubber strip 51 close to the bottom plate 21, the elastic deformation capability of the expansion portion 511 of the first sealing rubber strip 51 is smaller than that of the first sealing rubber strip 51, the interior of the first sealing rubber strip 51 is hollow, an arc portion 512 is disposed at one end of the first sealing rubber strip 51 far away from the bottom plate 21, and the arc portion 512 of the first sealing rubber strip 51 extends towards the direction far away from the bottom plate 21.

Referring to fig. 1 and 2, in order to improve the sealing performance between the side plate 22 and the door leaf 1, a groove 221 is formed in the side plate 22 close to the side wall of the door leaf 1, and the second sealing rubber strip 52 is fixedly connected to the groove 221 of the side plate 22. Under normal conditions, one end of the second sealing rubber strip 52 close to the door leaf 1 extends to the outer side of the groove 221 of the side plate 22, the side wall of the door leaf 1 close to the side plate 22 is fixedly connected with the embedded pressing strip 11, and when the turning beam 2 is in a closed state, the embedded pressing strip 11 can tightly support the second sealing rubber strip 52 between the side plate 22 and the door leaf 1.

The implementation principle of the sealing beam of the steel structure movable threshold double-leaf protective airtight door is as follows:

the first sealing rubber strip 51 is firstly extruded into the mounting groove 212 of the bottom plate 21 by an operator and is limited by the two limiting plates 41, then the operator rotates the first handle 35 to drive the reversing speed changer 34 to work, the output end of the reversing speed changer 34 drives the transmission shaft 33 to rotate, the transmission shaft 33 rotates to drive the crank 32 to rotate, the crank 32 rotates to drive the inverted L-shaped vertical connecting rod 31 to move, and the rocker 38 rotates under the combined action of the inverted L-shaped vertical connecting rod 31 and the hinged support 37 to drive the turnover beam 2 to turn over until the turnover beam 2 rotates to a closed state.

Then, the operator rotates the knob 464 to drive the third rotating shaft 461 to rotate, the third rotating shaft 461 rotates to drive the worm 462 to rotate, the worm 462 rotates to drive the worm wheel 463 to rotate, the worm wheel 463 rotates to drive the second rotating shaft 451 to rotate, the second rotating shaft 451 rotates to drive the two first bevel gears 452 to rotate simultaneously, the two first bevel gears 452 rotate to drive the two second bevel gears 453 to rotate simultaneously, the two second bevel gears 453 rotate to drive the two first rotating shafts 44 to rotate simultaneously, the first rotating shaft 44 rotates to drive the rotating gear 43 to rotate, the rotating gear 43 rotates to drive the rack 42 to drive the limit plate 41 to move away from the first sealant 51, therefore, the limiting plate 41 releases the limiting effect on the first sealing rubber strip 51, and the expansion part 511 of the first sealing rubber strip 51 recovers and deforms to enable the first sealing rubber strip 51 to be tightly abutted against the gap between the bottom plate 21 and the ground. Thereby improving the sealing performance between the bottom plate 21 and the ground. At this time, the embedded bead 11 tightly presses the second sealing rubber strip 52 between the side plate 22 and the door 1, so that the sealing performance between the side plate 22 and the door 1 can be improved, and the gap between the door 1 and the ground can be sealed.

In summary, since the first sealant strip 51 is compressed in the mounting groove 212 of the bottom plate 21, the first sealant strip 51 does not contact the ground when the operator closes the turnover beam 2, and therefore, the first sealant strip does not rub against the ground to cause damage.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a steel construction threshold biparting protective airtight door's sealed roof beam, connects upset roof beam (2) in door leaf (1) back bottom including rotating, its characterized in that: the turnover beam (2) comprises a bottom plate (21) and a side plate (22) which are perpendicular to each other, two baffle plates (211) which are arranged at intervals are arranged on the bottom wall of the bottom plate (21), an installation groove (212) is formed between the two baffle plates (211), and a first sealing rubber strip (51) is arranged in the installation groove (212) of the bottom plate (21); the sealing device is characterized in that an installation mechanism (4) used for installing a first sealing rubber strip (51) is arranged on the bottom plate (21), two sliding grooves (2111) are formed in the inner side wall, opposite to the baffle plate (211), of the baffle plate (211), the installation mechanism (4) is connected with a limiting plate (41) in the sliding groove (2111) of the baffle plate (211) in a sliding mode, a rack (42) is fixedly connected to one end, far away from the first sealing rubber strip (51), of the limiting plate (41), an accommodating cavity (2112) is formed in the baffle plate (211), a first rotating shaft (44) perpendicular to the bottom plate (21) is rotatably connected to the accommodating cavity (2112) of the baffle plate (211), a rotating gear (43) is fixedly connected to one end, close to the limiting plate (41), of the first rotating shaft (44), and the rotating gear (43) is meshed with the rack (42); the bottom plate (21) is also provided with a transmission assembly (45) for driving the first rotating shaft (44) to rotate.

2. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 1, characterized in that: an installation cavity (213) communicated with the accommodating cavities (2112) of the two baffles (211) is formed in the bottom plate (21), the transmission assembly (45) comprises a second rotating shaft (451) which is rotatably connected in the installation cavity (213) of the bottom plate (21), a first bevel gear (452) is fixedly sleeved at two ends of the second rotating shaft (451), a second bevel gear (453) is fixedly sleeved at one end, far away from the rotating gear (43), of the first rotating shaft (44), and the first bevel gear (452) is meshed with the second bevel gear (453); the bottom plate (21) is also provided with a driving assembly (46) for driving the second rotating shaft (451) to rotate.

3. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 2, characterized in that: the driving assembly (46) comprises a third rotating shaft (461) which is rotatably connected to the top wall of the bottom plate (21), one end of the third rotating shaft (461) penetrates through the top wall of the bottom plate (21) and extends into the installation cavity (213) of the bottom plate (21) and is fixedly connected with a worm (462), the other end of the third rotating shaft (461) is fixedly connected with a knob (464), a worm wheel (463) is fixedly sleeved on the second rotating shaft (451), and the worm wheel (463) is meshed with the worm (462).

4. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 1, characterized in that: one end of the first sealing rubber strip (51) close to the bottom plate (21) is provided with a wavy expansion part (511).

5. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 4, wherein: the first sealing rubber strip (51) is arranged in a hollow mode, and one end, far away from the bottom plate (21), of the first sealing rubber strip (51) is arranged to be an arc-shaped portion (512) extending towards the direction far away from the bottom plate (21).

6. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 1, characterized in that: the door leaf (1) is further provided with a turnover mechanism (3) for driving the turnover beam (2) to turn over, the turnover mechanism (3) comprises a hinged support (37) fixedly connected to the side wall of the back of the door leaf (1), a rocker (38) is hinged to the hinged support (37), and one end, far away from the hinged support (37), of the rocker (38) is fixedly connected with the turnover beam (2); the turnover mechanism (3) further comprises an inverted L-shaped vertical connecting rod, a crank (32), a transmission shaft (33), a reversing speed changer (34) and a first handle (35), the reversing speed changer (34) is installed on the side wall of the back face of the door leaf (1), one end of the first handle (35) is fixed on the input end of the reversing speed changer (34), the output end of the reversing speed changer (34) is connected with the transmission shaft (33), the transmission shaft (33) is rotatably connected to the side wall of the door leaf (1), the crank (32) is sleeved on the outer side wall of the transmission shaft (33), the other end of the crank (32) is hinged to the upper end of the inverted L-shaped vertical connecting rod, and the lower end of the inverted L-shaped vertical connecting rod is hinged to a rocker (38).

7. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 6, wherein: the side wall of the front face of the door leaf (1) is provided with a second handle (36), and the second handle (36) and the first handle (35) are coaxially arranged.

8. The sealing beam of the steel structure movable threshold double-leaf protective airtight door as claimed in claim 1, characterized in that: the side wall of the side plate (22) close to the door leaf (1) is provided with a groove (221), a second sealing rubber strip (52) is arranged in the groove (221) of the side plate (22), and an embedded pressing strip (11) for tightly abutting against the second sealing rubber strip (52) is fixedly connected to the side wall of the door leaf (1) close to the side plate (22).