Glass fiber composite material metro section protective airtight partition door and opening and closing method thereof

Abstract

The invention discloses a glass fiber composite metro section protective airtight partition door which comprises a door frame, a door leaf, a hinge, a movable doorsill and a lock, and the door frame comprises an upper angle steel, a lower doorsill, a left angle steel and a right angle steel; a door leaf body of the door leaf is made of glass fiber composite materials through a mold pressing process, the door leaf is installed on the left angle steel or the right angle steel through hinges, a gap exists between the door leaf and the lower threshold when the door is closed, and the movable threshold is installed on the lower threshold to block the gap to achieve protection and sealing. The lock comprises a door locking device and an input speed reducer, the door locking device comprises a connecting plate, a force transmission assembly and a locking assembly, the force transmission assembly comprises a horizontal rod, a lead screw, a transmission nut, a bearing seat, a screw sleeve rotating rod and a speed reduction reverser, and the locking assembly comprises a lock seat and a lock head; the door frame is provided with a locking hole. The door leaf is made of the glass fiber composite material with high specific strength, the door leaf is light in weight and resistant to corrosion, the multiple locking assemblies are driven to act synchronously through the connecting plate for locking, and the door closing and locking efficiency under the emergency condition is improved.

Description

Technical Field

[0001] This invention belongs to the field of subway partition doors, and more specifically, relates to a glass fiber composite material subway section protective airtight partition door and its opening and closing method. Background Technology

[0002] Rail transit, especially subway systems, are the arteries of public transportation in modern metropolises. Not only do they play a vital role in passenger flow management during peacetime, but their underground structures also serve as crucial civil defense facilities during wartime or emergencies. The design and construction of civil defense projects within rail transit systems must adhere to the principle of "combining peacetime and wartime needs," ensuring that protective facilities can be rapidly activated and provide effective protection during wartime.

[0003] In the civil defense engineering system of rail transit, the division of protective units is crucial. To achieve effective regional isolation and functional protection, protective airtight partition doors are usually installed in the tunnels of subway lines. These partition doors are one of the key protective devices in rail transit civil defense engineering, and their core function is to separate protective units. Their significance lies in the fact that when a protective unit is damaged or loses its protective function during wartime, the partition doors can ensure that adjacent protective units are unaffected and continue to perform their protective functions.

[0004] Installing protective airtight doors in subway sections presents a unique technical challenge: the subway tracks must pass through the doors. This results in a large and complex opening between the door panel (especially the lower edge of the door panel) and the track bed and rails, affecting the airtightness of the protective airtight doors.

[0005] The locking mechanisms currently used with traditional steel structure doors generally suffer from one or more of the following defects: Cumbersome operation and low opening / closing efficiency: Many large security doors use a multi-point independent locking system, which means that multiple independent locking handles or bolts are set around the door leaf (especially at the critical corners and midpoints). When opening or closing the door leaf, operators must operate each locking point one by one. This is acceptable for routine maintenance and inspection, but in emergency situations requiring rapid transition from peacetime to wartime operations, this method of operation is extremely time-consuming and labor-intensive, seriously affecting the rapid response capability of the security system.

[0006] The transmission mechanism is bulky, complex, and unreliable: To solve the problem of separate locking, some existing technologies have tried to use mechanical synchronous linkage mechanisms, such as long pull rods running through the door leaf, rocker arms, or complex gear chain systems. However, these transmission mechanisms (especially for large doors) are often bulky, take up a lot of space, and increase the weight of the door leaf.

[0007] Furthermore, the majority of mainstream airtight partition doors for rail transit sections on the market, whether for the door panels or the frames, are made of steel. Specifically, the door panels typically use shaped steel (such as channel steel and I-beams) as the frame, with welded steel plates serving as the skin and load-bearing structure. This traditional steel structure solution has revealed many insurmountable defects in long-term application: 1) The massive size of the protective airtight doors in subway sections results in incredibly heavy steel door panels, often weighing several tons or even tens of tons. This places stringent requirements on the load-bearing and opening / closing structures, with the weight of the door panels ultimately borne by the hinge structure. To support these heavy steel door panels, the hinge system must be designed to be extremely large and cumbersome. This places a heavy load on the civil engineering structure, requiring the door frame and the civil engineering structures supporting the hinges (such as tunnel walls and locating piles) to be excessively reinforced to withstand the enormous static load of the door panels and the dynamic load during opening and closing, significantly increasing the cost and difficulty of the civil engineering project. Furthermore, opening and closing is difficult, and the transition from peacetime to wartime operation is slow: although power-assisting devices such as speed reducers are provided, rotating and opening and closing such heavy door panels still requires considerable force and is a slow process. This hinders rapid transition from peacetime to wartime operation in emergencies.

[0008] 2) Complex manufacturing process and difficult quality control. The manufacturing of large steel structure door panels relies heavily on welding. Numerous long-distance welding operations generate enormous welding stress and thermal deformation, which is difficult to control. To ensure the door panels (especially the sealing surfaces in contact with the sealing strips) have extremely high flatness to meet airtightness requirements, complex anti-deformation processes, aging treatments, or expensive post-weld large-scale CNC machining must be employed during production, resulting in an extremely complex manufacturing process. Residual welding stress may lead to structural defects during long-term service and under shock wave loads.

[0009] 3) Poor corrosion resistance and high maintenance costs. Subway tunnels are generally located underground in humid environments with poor ventilation. Steel structures are highly susceptible to corrosion in such high-humidity conditions. Corrosion weakens the structural strength of the door panels, reducing their protective capabilities. More seriously, corrosion causes the sealing surface (where it contacts the sealing strip) to become rough and uneven, significantly compromising the door's airtightness. Simultaneously, moving parts such as hinges and locks are prone to jamming due to corrosion, leading to malfunctions in opening and closing.

[0010] In summary, the existing steel structure protective airtight partition doors for subway sections not only have significant defects in door leaf materials and structure, but their matching locking devices also generally suffer from problems such as low operating efficiency, poor sealing uniformity, laborious operation, bulky structure, and low reliability. Summary of the Invention

[0011] In view of the above-mentioned defects or improvement needs of the existing technology, the present invention provides a glass fiber composite material subway section protective airtight partition door and its opening and closing method. Under the premise of ensuring protective airtight performance, it achieves lightweight, high strength, corrosion resistance, easy production and installation, and is labor-saving to operate, with synchronous locking and closing and reliable sealing.

[0012] To achieve the above objectives, according to one aspect of the present invention, a glass fiber composite material protective airtight partition door for subway sections is provided, comprising a door frame, door leaf, hinges, a movable threshold, and a lock, wherein: The door frame includes an upper angle steel, a lower threshold, a left angle steel, and a right angle steel forming a quadrilateral. The lower threshold has a notch to allow the subway track to pass through it. The door leaf is mounted on the door frame via hinges. When the door leaf is closed, there is a gap between it and the lower threshold to prevent the door leaf from passing over the subway track. The movable threshold can be detached and mounted on the lower threshold when the door is closed to seal the gap and achieve a protective seal. The main body of the door leaf is made of fiberglass composite material through a molding process. There are sealing strips between the door frame and the door leaf, between the movable threshold and the door leaf, between the movable threshold and the track bed, and between the movable threshold and the track. The locking mechanism includes a door locking device and an input reducer. The door locking device includes a connecting plate, multiple sets of force transmission components arranged from top to bottom, and multiple sets of locking components arranged from top to bottom. Each set of force transmission components includes a horizontal rod, a lead screw, a transmission nut, a bearing seat, a screw sleeve rotating rod, and a reducer. Each set of locking components includes a lock seat and a lock head slidably mounted on the lock seat. Each lock seat is fixedly mounted on the door leaf. Each lock head is fixedly connected to the connecting plate. Each horizontal rod is fixedly connected to the connecting plate. In each of the force transmission components, the horizontal rod is connected to the transmission nut mounted on the lead screw, the lead screw is connected to the speed reducer via the lead sleeve rotating rod, the lead sleeve rotating rod is mounted on the bearing seat via the bearing, the bearing seat and the speed reducer are respectively mounted on the door leaf, and the speed reducer is connected to the input speed reducer mounted on the door leaf via the vertical rod. The door frame is provided with locking holes corresponding to each lock head.

[0013] Preferably, there are two locking devices arranged on the left and right sides of the door leaf, and multiple locking holes are provided on the left and right angle steels respectively; Each of the aforementioned door locking devices has two or three sets of force transmission components arranged vertically.

[0014] Preferably, the upper angle steel, left angle steel, and right angle steel are welded together. The position and size of the lower sill are adjusted to adapt to the position and size of the subway track. After adjustment, the lower sill is fixedly connected to the left and right angle steels. Door frame rubber strip grooves are welded on the upper angle steel, left angle steel, and right angle steel for installing sealing strips that come into contact with the door leaf. The movable threshold can be detachably installed on the lower threshold when the door is closed, and the lower part of the movable threshold has a groove for installing a sealing strip that contacts the track bed, the lower threshold and the subway track. The side of the movable threshold has a groove for installing a sealing strip that contacts the door leaf.

[0015] Preferably, the door leaf further includes a cover plate, a handle, a movable threshold bracket, a retaining plate, and a lifting ring. The main body of the door leaf is made of SMC composite material and has a honeycomb structure formed by hexagonal units and / or quadrilateral units. The cover plate is made of SMC composite material and is fixed to the main body of the door leaf. The handle is connected to the embedded parts installed on the main body of the door leaf for opening and closing the door leaf. The movable threshold bracket is connected to the embedded parts installed on the main body of the door leaf and is exposed on the cover plate. The retaining plate is made of steel structure plate or SMC composite material and is embedded in the cover plate to improve the strength of the cover plate. The lifting ring is connected to the embedded parts installed on the main body of the door leaf to facilitate the hoisting of the door leaf.

[0016] Preferably, a hinge base plate is fixedly installed on the door frame; The hinge includes a hinge base, a hinge plate, and a door leaf hinge base. The hinge base is fixedly installed on the hinge base plate. The hinge plate is hinged to the hinge base via a first hinge shaft. The hinge base is connected to the hinge plate via a limiting shaft and is fixedly connected to the door leaf. The first hinge shaft is vertically arranged.

[0017] Preferably, it also includes a load-bearing arm and a load-bearing base; There are two hinge base plates, namely an upper hinge base plate and a lower hinge base plate, and correspondingly, there are two hinges; The load-bearing arm is fixedly connected to the door leaf. The lower part of the load-bearing arm is hinged to the load-bearing base through a second hinge shaft and supported by the load-bearing base. The load-bearing base is fixedly installed on the bottom plate of the lower hinge leaf. The second hinge shaft is vertically arranged.

[0018] Preferably, the input shaft of the input reducer passes through the door leaf, and both ends of the input shaft of the input reducer are exposed outside the door leaf. Each end of the input shaft of the input reducer is connected to a handwheel so that the locking can be operated from both sides of the door leaf.

[0019] Preferably, the device further includes a safety device, which includes an embedded plate, a limiting block, and a clamping block. The embedded plate is cast into the limiting pile of the civil structure, the limiting block is welded to the embedded plate, and the clamping block is detachably installed on the embedded plate for clamping and fixing the door leaf together with the limiting block after the door is opened.

[0020] Preferably, the safety device further includes a connecting shell, a jack, and a fixing sleeve. The connecting shell is fixed to an embedded part embedded in the door leaf, the fixing sleeve is welded and fixed to the embedded plate, and the jack is installed inside the connecting shell. The protruding shaft of the jack is vertically downward and inserted into the fixing sleeve to achieve the limiting and fixing of the door leaf.

[0021] According to another aspect of the present invention, a method for opening and closing the aforementioned glass fiber composite material subway section protective airtight partition door is also provided, comprising the following steps: 1) The protective airtight partition door remains in the normally open state, and its closing process is as follows: 1.1) The movable threshold is detachably installed on the lower threshold; 1.2) Activate the jack on the connecting housing that is fixed to the door leaf, so that the protruding shaft of the jack is disengaged from the fixing sleeve welded to the embedded plate; 1.3) Remove the top block of the safety device that is blocking the placement of the door leaf, so that the door leaf can rotate freely; 1.4) Rotate the door to the closed position; 1.5) Rotate the handwheel connected to the input shaft of the input reducer in the first direction, and drive the force transmission assembly consisting of the input reducer, the reducer reversing device, the threaded sleeve rotating rod, the lead screw, the transmission nut and the horizontal rod through the handwheel. The force transmission assembly drives the connecting plate to move horizontally, so that the lock head fixed on the connecting plate slides horizontally on the lock seat and extends out of the lock seat. 1.6) The lock head is inserted into the corresponding locking hole on the door frame to close the door. The door frame applies force to the door leaf through the lock head, so that the door leaf fits with the door frame and the movable threshold, and the sealing strips between the door frame and the door leaf, between the movable threshold and the door leaf, between the movable threshold and the track bed, and between the movable threshold and the track are compressed to achieve sealing. 2) The opening process of the protective airtight partition door is as follows: 2.1) Rotate the handwheel in a direction opposite to the first direction to disengage the lock head from the locking hole and retract it into the lock seat; 2.2) Pull the handle of the door leaf to rotate and open the door leaf to the predetermined position; 2.3) Move the door leaf to the safety device and use the limiting block and the top block on the embedded plate of the limiting pile cast in the civil structure to clamp and fix the door leaf together; 2.4) Activate the jack on the connecting shell that is fixed to the door leaf, so that the protruding shaft of the jack is inserted vertically downward into the fixing sleeve welded on the embedded plate, so as to realize the limiting fixation and support of the door leaf; 2.5) Remove the movable threshold from the lower threshold to restore subway traffic.

[0022] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1) The glass fiber composite material protective airtight partition door for subway sections of this invention uses glass fiber composite material for the main body of the door leaf, which is significantly lighter than the steel used in traditional door leaves. This lightweight characteristic makes opening and closing the door easier and greatly improves the efficiency of closing and locking in emergencies, meeting the core requirement of rapid conversion between peacetime and wartime in civil defense projects. At the same time, the significant reduction in the door leaf's weight means that the hinges and load-bearing arms do not need to be designed to be excessively large and cumbersome, greatly reducing the load pressure on the civil engineering structure. While achieving lightweight, the door leaf also possesses extremely high specific strength and structural rigidity, and has excellent chemical stability and corrosion resistance. In the high-humidity environment of the subway, it fundamentally eliminates the occurrence of rust. This not only ensures the long-term stability of the door leaf's structural strength.

[0023] 2) The glass fiber composite material subway section protective airtight partition door of the present invention uses an input reducer as the main power source, distributes power through the vertical rod and the reducer, and then drives each set of force transmission components. This enables multiple sets of locking components on the door to move synchronously with only one operation, completely solving the problem of time-consuming and labor-intensive separate locking, greatly improving the door closing and locking efficiency in emergency situations, and meeting the requirements of rapid conversion between peacetime and wartime in civil defense projects.

[0024] 3) The glass fiber composite material subway section protective airtight partition door of the present invention has an ingenious door frame design. The notch on the lower threshold adapts to the subway track passage requirements, while reserving installation space for the movable threshold. The detachable installation method of the movable threshold not only avoids the sealing problem caused by direct contact between the track and the lower edge of the door leaf, but also facilitates daily maintenance and component replacement, improving the overall reliability and adaptability.

[0025] 4) The glass fiber composite material subway section protective airtight partition door of the present invention features sealing strips between the door frame and the door leaf, between the movable threshold and the door leaf, between the movable threshold and the track bed, and between the movable threshold and the track. This all-around sealing design greatly enhances the airtightness and watertightness of the partition door. After the lock head is inserted into the locking hole, the locking force makes the door leaf, door frame, and movable threshold fit tightly together, thereby evenly compressing the sealing strip and ensuring that the sealing strip is under consistent pressure along its entire circumference, avoiding the risk of local leakage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the glass fiber composite material subway section protective airtight partition door of the present invention; Figure 2 for Figure 1 Sectional view along line AA; Figure 3 for Figure 1 Sectional view along line BB; Figure 4 This is a schematic diagram of the door frame structure in this invention; Figure 5 for Figure 4 A cross-sectional view along the CC line; Figure 6 This is a schematic diagram of the door leaf structure in this invention; Figure 7 for Figure 6 A sectional view along the DD line; Figure 8 This is a schematic diagram of the main body of the door leaf in this invention; Figure 9 This is a schematic diagram of the hinge, load-bearing arm, and load-bearing base installed on the hinge base plate in this invention; Figure 10 for Figure 9 E-direction diagram in the middle; Figure 11 for Figure 9 Sectional view along the FF line; Figure 12 This is a front view of the lock installed on the door leaf in this invention; Figure 13 This is a top view of the lock installed on the door leaf in this invention; Figure 14 This is a schematic diagram of the sealing strip in this invention; Figure 15 This is a front view of the safety device in this invention; Figure 16 for Figure 15 A partial view of the sectional view along line I-I.

[0027] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Door frame; 2. Door leaf; 3. Hinge; 4. Lock; 5. Sealing strip; 6. Safety device; 7. Upper angle steel; 8. Left angle steel; 9. Lower sill; 10. Removable sill; 11. Removable sill lower sealing strip groove; 12. Removable sill side sealing strip groove; 13. Right angle steel; 14. Locking hole; 15. Lower hinge base plate; 16. Upper hinge base plate; 17. Door frame sealing strip groove; 18. Door leaf body; 19. Cover plate; 20. Handle; 21. Removable sill hanger; 22. Embedded plate; 23. First embedded bolt sleeve; 24. Lifting ring; 25. Hinge seat; 26. Hinge plate; 27. Door leaf hinge seat; 28. Second embedded bolt sleeve; 29. Embedded threaded sleeve; 30. Load-bearing arm; 31. Load-bearing base; 32. Lock head; 33. Lock seat; 34. Third embedded threaded sleeve; 35. Connecting plate; 36. Horizontal bar; 37. Lead screw; 38. Bearing seat; 39. Threaded sleeve rotating rod; 40. Reducer; 41. Lower vertical rod; 42. Input reducer; 43. Upper vertical rod; 44. Peripheral sealing strip; 45. Side sealing strip of movable sill; 46. Lower sealing strip of movable sill; 47. Connecting housing; 48. Fourth embedded threaded sleeve; 49. Jack; 50. Fixing sleeve; 51. Embedded plate; 52. Limiting block; 53. Tightening block. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Reference Figures 1-16 A glass fiber composite material subway section protective airtight partition door, including a door frame 1, a door leaf 2, hinges 3, a movable threshold 10, and a lock 4.

[0030] The door frame 1 includes an upper angle steel, a lower threshold 9, a left angle steel 8, and a right angle steel 13 forming a quadrilateral. The lower threshold 9 has a notch to allow the subway track to pass through it. The door leaf 2 is mounted on the door frame 1 via a hinge 3. The main body of the door leaf 2 is made of fiberglass composite material through a molding process. When the door leaf 2 is closed, there is a gap between it and the lower threshold 9 to avoid the subway track. The movable threshold 10 can be detached and installed on the lower threshold 9 when the door is closed to seal the gap and achieve a protective seal. There are sealing strips 5 between the door frame 1 and the door leaf 2, between the movable threshold 10 and the door leaf 2, between the movable threshold 10 and the track bed, and between the movable threshold 10 and the track.

[0031] The locking mechanism 4 includes a door locking device and an input reducer 42. The door locking device includes a connecting plate 34, multiple sets of force transmission components arranged from top to bottom, and multiple sets of locking components arranged from top to bottom. Each set of force transmission components includes a horizontal rod 35, a lead screw 36, a transmission nut, a bearing seat 37, a threaded sleeve rotating rod 39, and a speed reducer 40. Each set of locking components includes a lock seat 32 and a lock head 31 slidably mounted on the lock seat 32. Each lock seat 32 is fixedly mounted on the door leaf 2. Preferably, the lock seat 32 is connected and fixedly mounted to a third pre-embedded threaded sleeve 33 pre-embedded in the door leaf 2 by bolts. Each lock head 31 is fixedly connected to the connecting plate 34, and each horizontal rod 35 is fixedly connected to the connecting plate 34.

[0032] In each set of force transmission components, the horizontal rod 35 is connected to the transmission nut mounted on the lead screw 36. The lead screw 36 is connected to the reducer 40 via the threaded sleeve rotating rod 39. The threaded sleeve rotating rod 39 is mounted on the bearing seat 37 via the bearing 38. The bearing seat 37 and the reducer 40 are respectively mounted on the door leaf 2. The reducer 40 is connected to the input reducer 42 mounted on the door leaf 2 via the vertical rod. If there are two sets of force transmission components, there are two vertical rods, namely the upper vertical rod 43 and the lower vertical rod 41, which are directly connected to the upper reducer 40 and the lower reducer 40, respectively. If there are two sets of force transmission components, there are three vertical rods. The input reducer 42 is connected to two of the reducers 40, and the remaining reducer 40 is connected to one of the reducers 40 via a vertical rod. The remaining reducer 40 is then indirectly connected to the input reducer 42 via the vertical rod.

[0033] The door frame 1 is provided with locking holes 14 corresponding to each lock head 31, which are engaged with the lock head 31.

[0034] Because this invention uses a connecting plate 34 to connect multiple lock heads 31, the number of locking components and the number of force transmission components can be different; the number of locking components can be greater than the number of force transmission components. See [reference needed]. Figure 1 , Figure 12 Four sets of locking components and two sets of force transmission components are set up. The number of locking components is relatively large because the door leaf 2 needs to meet the requirements of bidirectional force. When the front shock wave load acts on the door leaf, the load is transferred to the door frame 1 through the sealing strip and the sealing strip groove, and then to the door frame wall. At this time, the function of the lock head 31 is only to press the sealing strip through the door leaf 2. When the reverse shock wave load acts on the door leaf, the load is transferred to the door frame 1 through the lock head, and then to the door frame wall. At this time, the function of the lock head 31 is not only to press the sealing strip through the door leaf 2, but also to withstand a large shock wave load. Therefore, multiple sets of locking components are needed to share the load.

[0035] Multiple lock heads 31 on the same side are fixed to the same connecting plate 34, which is driven by force transmission components such as a horizontal rod 35 and a transmission nut. This design ensures that the extension stroke displacement of all lock heads 31 is completely consistent and rigidly synchronized. When all lock heads 31 are simultaneously inserted into the locking holes 14 on the door frame 1, the locking force they apply to the door leaf 2 is evenly distributed. This uniform pressure ensures that the sealing strip 5 between the door leaf 2, the door frame 1, and the movable threshold 10 is under consistent pressure, avoiding local sealing defects or leakage points, thus achieving a highly reliable sealing performance far superior to existing technologies. This invention utilizes a reducer and a vertical rod for transmission, and uses a lead screw 36 to convert rotary motion into linear motion. The structural design is more sophisticated and compact, easy to integrate and install on the door leaf 2, and the transmission components are highly rigid with fewer failure points, ensuring long-term operation in humid environments.

[0036] Further, see Figure 12 There are two door locking devices arranged on the left and right sides of the door leaf 2, and there are also two connecting plates 34. Multiple locking holes 14 are respectively provided on the left angle steel 8 and the right angle steel 13.

[0037] Each of the aforementioned door locking devices has two sets of force transmission components, one upper and one lower, and each door locking device has four sets of locking components. The lock heads 31 of the four sets of locking components of each door locking device are connected to the same connecting plate 34.

[0038] By employing two locking devices arranged on the left and right sides, and synchronously driven by the same power source—the input reducer 42—it is ensured that the left and right sides of the door leaf 2 are subjected to equal and symmetrical locking forces at the same time. This symmetrical force system completely eliminates the eccentric torque that could cause the door leaf 2 to twist, ensuring that the door leaf 2 remains straight throughout the locking process, and providing the most basic mechanical guarantee for uniformly pressing the sealing strip 5.

[0039] Each of the aforementioned door locking devices has two sets of force transmission components, or up to three sets, to accommodate protective airtight partition doors with large opening heights.

[0040] The input reducer 42 serves as the sole power source, and through the drive shaft and the reducer 40, the power is synchronously distributed to the left and right sides; on each side, the power is then synchronously distributed to the upper and lower sets of force transmission components.

[0041] This structure ultimately achieves the following: the operator only needs to operate the handwheel at one point, and all the locks 31 of the door leaf 2 will be inserted into the locking holes 14 of the door frame 1 at the same time, with the same stroke and the same locking force.

[0042] Furthermore, the upper angle steel 7, left angle steel 8, and right angle steel 13 are welded together. The position and size of the lower sill 9 are adjusted to adapt to the position and size of the subway track. After adjustment, the lower sill 9 is fixedly connected to the left angle steel 8 and right angle steel 13. Door frame rubber strip grooves 17 are welded on the upper angle steel 7, left angle steel 8, and right angle steel 13 for installing the sealing rubber strip 5 that contacts the door leaf 2.

[0043] The movable threshold 10 is detachably installed on the lower threshold 9 when the door is closed, and the lower part of the movable threshold 10 is welded with a movable threshold lower rubber strip groove 11 for installing a sealing rubber strip 5 that contacts the track bed, the lower threshold 9 and the subway track. The side of the movable threshold 10 is welded with a movable threshold side rubber strip groove 12 for installing a sealing rubber strip 5 that contacts the door leaf 2.

[0044] The door frame 1 of this invention is designed with high flexibility. It allows the construction unit to accurately measure the actual elevation and position of the track on site, and then precisely position and adjust the lower threshold 9 to perfectly fit the shape of the track on site, and then firmly fix it to the left and right angle steels 13 of the door frame 1.

[0045] The adhesive strip groove structure of this invention firmly fixes the adhesive strip in a predetermined position, ensuring that it can only undergo elastic compression within the groove, with no possibility of displacement or detachment. This ensures that the seal remains intact and effective even under the most extreme stress conditions.

[0046] The sealing strip 5 includes a peripheral sealing strip 44, a sill-side sealing strip 45, and a sill-bottom sealing strip 46. The peripheral sealing strip 44 is installed in the door frame sealing strip groove 17 of the door frame 1. The sill-side sealing strip 45 is installed in the sill-side sealing strip groove 12. The sill-bottom sealing strip 46 is installed in the sill-bottom sealing strip groove 11.

[0047] Furthermore, the design of the movable threshold 10 is particularly important in this invention. The movable threshold 10 not only has a side rubber strip groove facing the door leaf 2, but also a lower rubber strip groove facing the track bed and track below. This design enables the movable threshold 10 to simultaneously and independently complete the reliable sealing of the two most complex interfaces, the door leaf 2 and the ground track, after installation, thus solving the sealing problem of the huge and complex opening caused by the track crossing.

[0048] Furthermore, the door leaf 2 also includes a cover plate 19, a handle 20, a movable threshold bracket 21, a pressing plate 22, and a hanging ring 24. The door leaf body 18 is made of SMC composite material and has a honeycomb structure formed by hexagonal units and / or quadrilateral units. The cover plate 19 is made of SMC composite material and is fixed to the door leaf body 18. The handle 20 is connected to the embedded parts installed on the door leaf body 18 for opening and closing the door leaf 2. The movable threshold bracket 21 is connected to the embedded parts installed on the door leaf body 18 and is exposed on the cover plate 19. The movable threshold bracket 21 is used to hang the movable threshold 10 after the door is normally opened so that the movable threshold 10 can be used conveniently after the door is closed. The pressing plate 22 is made of steel structure plate or SMC composite material and is embedded in the cover plate 19. The hanging ring 24 is connected to the embedded parts installed on the door leaf body 18 to facilitate the hoisting of the door leaf 2. The embedded parts on the door leaf body adopt the first embedded screw sleeve 23. After the door leaf 2 is closed, the pressing plate 22 presses down on the sealing strip in the rubber strip groove to achieve a better sealing effect.

[0049] SMC composite materials are lightweight and corrosion-resistant, but to use them to replace load-bearing steel structures, the structural strength issue must be addressed. Honeycomb structures, a highly efficient structural design derived from biomimicry, provide maximum structural rigidity and compressive and bending strength with minimal material usage. The combination of SMC composite materials and honeycomb structures results in overall performance far exceeding that of steel structures.

[0050] The embedded parts are firmly anchored inside the honeycomb structure during the SMC composite material molding of the door leaf body 18, rather than simply fixed to the surface. This allows the huge tensile force borne by components such as handle 20 and lifting ring 24 to be effectively distributed into the deep structure of the door leaf 2, avoiding the risk of the connection points tearing off from the surface of the composite material and ensuring the safety of operation and hoisting.

[0051] The door leaf 2, through the collaborative design of SMC composite material, honeycomb core, embedded parts and pressure plate 22, fundamentally solves the pain points of steel structure door leaf 2, integrating lightweight, high strength, corrosion resistance, easy manufacturing, high flatness, functional integration and structural optimization.

[0052] Furthermore, a hinge base plate is fixedly installed on the door frame 1.

[0053] The hinge 3 includes a hinge base 25, a hinge plate 26, and a door leaf hinge seat 27. The hinge base 25 is fixedly mounted on the hinge base plate. The hinge plate 26 is hinged to the hinge base 25 via a first hinge shaft. The hinge seat is connected to the hinge plate 26 via a limiting shaft and is fixedly connected to the door leaf 2. The first hinge shaft is vertically arranged. This modular, split structure greatly facilitates installation and adjustment, and also allows the door leaf 2 to rotate easily.

[0054] Furthermore, it also includes a load-bearing arm 29 and a load-bearing base 30.

[0055] There are two hinge base plates, namely the upper hinge base plate 16 and the lower hinge base plate 15, and correspondingly, there are two hinges 3.

[0056] The load-bearing arm 29 is fixedly connected to the door leaf 2. Preferably, the side of the load-bearing arm 29 is fixed to the second pre-embedded screw sleeve 28 pre-embedded in the door leaf body 18 by bolts. The lower part of the load-bearing arm 29 is hinged to the load-bearing base 30 through the second hinge shaft and supported by the load-bearing base 30. The load-bearing base 30 is fixedly installed on the lower hinge plate 15. The second hinge shaft is vertically set.

[0057] By adding the load-bearing arm 29 and the load-bearing base 30, an extremely robust load-bearing system is created. The vertical weight of the door leaf 2 is transferred downwards through the load-bearing arm 29 fixed to it and is supported by the load-bearing base 30. The load-bearing base 30 is firmly installed on the lower hinge base plate 15, thereby safely transferring the entire weight to the door frame 1 and the civil structure. The hinge 3 does not need to bear the vertical weight of the door leaf 2; its function is to guide the movement trajectory of the door leaf 2. This design ensures that the hinge 3 can maintain its movement accuracy for a long time, thereby guaranteeing the long service life and reliability of the sealing strip 5. This ensures that the installation accuracy of the door leaf 2 remains constant after long-term use, which ensures that the bottom edge of the door leaf 2 and the sealing strip 5 of the threshold 10 are always at the correct design height. It also ensures that the multiple sets of locks 31 on the door leaf 2 can be accurately aligned and inserted into the locking holes 14 on the door frame 1.

[0058] Furthermore, the input shaft of the input reducer 42 passes through the door leaf 2, and both ends of the input shaft of the input reducer 42 are exposed outside the door leaf 2. Each end of the input shaft of the input reducer 42 is connected to a handwheel, so that the locking 4 can be operated from both sides of the door leaf 2. The handwheel can be detachably installed on the input shaft of the input reducer 42.

[0059] Through bidirectional operation, rotating the handwheel on one side will synchronously rotate the handwheel on the other side. The person on the other side can clearly see that the door 2 is being operated by observing the rotation of the handwheel, eliminating the contradictory situation of one side locking and the other unlocking. The input shaft of the input reducer 42 is a through-core shaft, ensuring that regardless of which side the power comes from, the command transmitted to the downstream input reducer 42 is always unique and synchronous, thus guaranteeing the reliable operation of the multi-point synchronous interlocking system 4. The handwheel of this invention is connected to the input shaft of the input reducer 42. This means that regardless of which side the operator is on, they can operate the input reducer 42, the reduction reversing device 40, and the lead screw 36, which together provide a huge mechanical gain and labor-saving effect. This ensures that a single person, on either side, can independently and easily complete the locking and closing operation of the large door 2.

[0060] Furthermore, it also includes a safety device 6, which includes an embedded plate 51, a limiting block 52, and a clamping block 53. The embedded plate 51 is cast into the limiting pile of the civil structure. The limiting block 52 is welded to the embedded plate 51. The clamping block 53 is detachably installed on the embedded plate 51 and is used to clamp and fix the door leaf 2 together with the limiting block 52 after the door is opened.

[0061] The protective airtight partition doors in subway tunnels must remain open during peacetime to ensure normal subway operation. However, a massive door panel weighing several tons, even a lightweight SMC door panel, would pose a significant safety hazard if it were only held open by its hinges. Subway tunnels are extremely harsh working environments, filled with intense vibrations from high-speed trains and immense piston-effect wind pressure.

[0062] The embedded plate 51 ensures that the base of the safety device 6 is as robust as the tunnel itself, capable of withstanding the strongest air impacts generated when a train passes and the vibrations over many years, without ever loosening or failing. The limiting block 52, acting as a fixed rear stop, first bears the inertia of the door leaf 2; subsequently, the operator installs the detachable clamping block 53. These two components clamp and secure the door leaf 2 from both sides. This clamping state eliminates all degrees of freedom of the door leaf 2, preventing any wobbling, swinging, or micro-movement. The enormous wind pressure generated when a train passes through the tunnel is sufficient to cause an unsecured door leaf 2 to slam or violently open and close. The rigid clamping design of this invention makes the door leaf 2 an integral part of the civil engineering limiting pile, completely immune to the impact of such wind pressure, thereby eliminating the catastrophic risk of the door leaf 2 suddenly closing or swinging and colliding with the train.

[0063] Furthermore, the safety device 6 also includes a connecting housing 47, a jack 49, and a fixing sleeve 50. The connecting housing 47 is fixed to an embedded part pre-embedded in the door leaf 2, and the embedded part connected to the connecting housing 47 is preferably a fourth embedded threaded sleeve 48. The fixing sleeve 50 is welded and fixed to the embedded plate 51. The jack 49 is installed inside the connecting housing 47, with the protruding shaft of the jack 49 pointing vertically downward and inserted into the fixing sleeve 50 to achieve the limiting and fixing of the door leaf 2.

[0064] The system consisting of jack 49, connecting housing 47, and fixing sleeve 50 provides an active, vertical support and locking function. The protruding shaft of jack 49, after being inserted into fixing sleeve 50, itself constitutes an extremely robust shear pin. This vertical steel shaft, firmly fixed to the foundation, provides immense shear strength, thus completely preventing lateral swaying of door leaf 2 physically, not just through friction. Activating jack 49 generates an upward lifting force, transferring most of the weight of door leaf 2 to this rigid support system composed of jack 49 and the foundation, reducing the burden on hinge 3 and load-bearing arm 29.

[0065] According to another aspect of the present invention, a method for opening and closing the aforementioned glass fiber composite material subway section protective airtight partition door is also provided, comprising the following steps: 1) The protective airtight partition door remains in the normally open state, and its closing process is as follows: 1.1) The movable sill 10 is detachably installed on the lower sill 9; 1.2) Activate the jack 49 on the connecting housing fixed to the door leaf 2, so that the protruding shaft of the jack 49 is disengaged from the fixing sleeve 50 welded to the embedded plate 51; 1.3) Remove the top block 53 of the safety device 6 that prevents the door leaf 2 from rotating, so that the door leaf 2 can rotate freely; 1.4) Rotate the door 2 to the closed position; 1.5) Rotate the handwheel connected to the input shaft of the input reducer 42 in the first direction. Drive the force transmission assembly consisting of the input reducer 42, the reducer 40, the threaded sleeve rotating rod 39, the lead screw 36, the transmission nut and the horizontal rod 35 through the handwheel. The force transmission assembly drives the connecting plate 34 to move horizontally, so that the lock head 31 fixed on the connecting plate 34 slides horizontally on the lock seat 32 and extends out of the lock seat 32. 1.6) The lock head 31 is inserted into the corresponding locking hole 14 on the door frame 1 to close the door. The door frame 1 applies force to the door leaf 2 through the lock head 31, so that the door leaf 2 fits with the door frame 1 and the movable threshold 10, and the sealing strip 5 between the door frame 1 and the door leaf 2, between the movable threshold 10 and the door leaf 2, between the movable threshold 10 and the track bed, and between the movable threshold 10 and the track is compressed to achieve sealing. 2) The opening process of the protective airtight partition door is as follows: 2.1) Rotate the handwheel in a direction opposite to the first direction to disengage the lock head 31 from the locking hole 14 and retract it into the lock seat 32; 2.2) Pull the handle 20 of door leaf 2 to rotate and open door leaf 2 to the predetermined position; 2.3) Move the door leaf 2 to the safety device 6, and use the limiting block 52 and the top block 53 on the pre-embedded plate 51 cast in the limiting pile of the civil structure to clamp and fix the door leaf 2 together; 2.4) Activate the jack 49 on the connecting shell that is fixed to the door leaf 2, so that the protruding shaft of the jack 49 is inserted vertically downward into the fixing sleeve 50 welded on the embedded plate 51, so as to realize the limiting fixation and support of the door leaf 2. 2.5) Remove the live threshold 10 from the lower threshold 9 to restore subway traffic.

[0066] When opening and closing the airtight partition door, the operator only needs to perform one action—rotating the handwheel connected to the input shaft of the input reducer 42. This single-point input, through driving the precision force transmission components of this invention, including the input reducer 42, the speed reducer 40, and the lead screw 36, achieves the synchronous extension (retraction) and locking (opening) of all lock heads 31, greatly improving the efficiency of locking and unlocking. The rigid synchronization of the mechanical structure ensures that all lock heads 31 are inserted into the locking hole 14 at the same time, with the same stroke and the same locking force, and can exit the locking hole 14 when unlocking. Moreover, the force applied by the locking hole 14 on the door frame 1 is evenly distributed around the door leaf 2, thus ensuring that all sealing strips 5, such as those between the door frame 1 and the door leaf 2, and between the movable threshold 10 and the door leaf 2, are evenly pressurized, achieving highly reliable airtight performance.

[0067] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A glass fiber composite material subway section protection sealing partition door, characterized in that, Includes door frame, door leaf, hinges, movable threshold, and lock, among which: The door frame includes an upper angle steel, a lower threshold, a left angle steel, and a right angle steel forming a quadrilateral. The lower threshold has a notch to allow the subway track to pass through it. The door leaf is mounted on the door frame via hinges. When the door leaf is closed, there is a gap between it and the lower threshold to prevent the door leaf from passing over the subway track. The movable threshold can be detached and mounted on the lower threshold when the door is closed to seal the gap and achieve a protective seal. The main body of the door leaf is made of fiberglass composite material through a molding process. There are sealing strips between the door frame and the door leaf, between the movable threshold and the door leaf, between the movable threshold and the track bed, and between the movable threshold and the track. The locking mechanism includes a door locking device and an input reducer. The door locking device includes a connecting plate, multiple sets of force transmission components arranged from top to bottom, and multiple sets of locking components arranged from top to bottom. Each set of force transmission components includes a horizontal rod, a lead screw, a transmission nut, a bearing seat, a screw sleeve rotating rod, and a reducer. Each set of locking components includes a lock seat and a lock head slidably mounted on the lock seat. Each lock seat is fixedly mounted on the door leaf. Each lock head is fixedly connected to the connecting plate. Each horizontal rod is fixedly connected to the connecting plate. In each of the force transmission components, the horizontal rod is connected to the transmission nut mounted on the lead screw, the lead screw is connected to the speed reducer via the lead sleeve rotating rod, the lead sleeve rotating rod is mounted on the bearing seat via the bearing, the bearing seat and the speed reducer are respectively mounted on the door leaf, and the speed reducer is connected to the input speed reducer mounted on the door leaf via the vertical rod. The door frame is provided with locking holes corresponding to each lock head.

2. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, There are two locking devices, which are arranged on the left and right sides of the door leaf, and multiple locking holes are provided on the left and right angle steels respectively; Each of the aforementioned door locking devices has two or three sets of force transmission components, one above the other.

3. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, The upper angle steel, left angle steel, and right angle steel are welded together. The position and size of the lower threshold are adjusted to adapt to the position and size of the subway track. After adjustment, the lower threshold is fixedly connected to the left angle steel and right angle steel. Door frame rubber strip grooves are welded on the upper angle steel, left angle steel, and right angle steel for installing sealing rubber strips that come into contact with the door leaf. The movable threshold can be detachably installed on the lower threshold when the door is closed, and the lower part of the movable threshold has a groove for installing a sealing strip that contacts the track bed, the lower threshold and the subway track. The side of the movable threshold has a groove for installing a sealing strip that contacts the door leaf.

4. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, The door leaf also includes a cover plate, handle, movable threshold bracket, embedding plate, and lifting ring. The main body of the door leaf is made of SMC composite material and has a honeycomb structure formed by hexagonal and / or quadrilateral units. The cover plate is made of SMC composite material and is fixed to the main body of the door leaf. The handle is connected to the embedded parts installed on the main body of the door leaf for opening and closing the door leaf. The movable threshold bracket is connected to the embedded parts installed on the main body of the door leaf and is exposed on the cover plate. The embedding plate is made of steel structure plate or SMC composite material and is embedded in the cover plate to improve the strength of the cover plate. The lifting ring is connected to the embedded parts installed on the main body of the door leaf to facilitate the hoisting of the door leaf.

5. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, A hinge base plate is fixedly installed on the door frame; The hinge includes a hinge base, a hinge plate, and a door leaf hinge base. The hinge base is fixedly installed on the hinge base plate. The hinge plate is hinged to the hinge base via a first hinge shaft. The hinge base is connected to the hinge plate via a limiting shaft and is fixedly connected to the door leaf. The first hinge shaft is vertically arranged.

6. The glass fiber composite metro section protection sealed partition door according to claim 5, characterized in that, It also includes a load-bearing arm and a load-bearing base; There are two hinge base plates, namely an upper hinge base plate and a lower hinge base plate, and correspondingly, there are two hinges; The load-bearing arm is fixedly connected to the door leaf. The lower part of the load-bearing arm is hinged to the load-bearing base through a second hinge shaft and supported by the load-bearing base. The load-bearing base is fixedly installed on the bottom plate of the lower hinge leaf. The second hinge shaft is vertically arranged.

7. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, The input shaft of the input reducer passes through the door leaf, and both ends of the input shaft of the input reducer are exposed outside the door leaf. Each end of the input shaft of the input reducer is connected to a handwheel so that the locking can be operated from both sides of the door leaf.

8. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, It also includes a safety device, which includes an embedded plate, a limiting block and a clamping block. The embedded plate is cast into the limiting pile of the civil structure, the limiting block is welded to the embedded plate, and the clamping block is detachably installed on the embedded plate to clamp and fix the door leaf together with the limiting block after the door is opened.

9. The glass fiber composite metro section protection sealed partition door according to claim 1, characterized in that, The safety device also includes a connecting shell, a jack, and a fixing sleeve. The connecting shell is fixed to a pre-embedded part embedded in the door leaf. The fixing sleeve is welded and fixed to the pre-embedded plate. The jack is installed inside the connecting shell. The extension shaft of the jack is vertically downward and inserted into the fixing sleeve to achieve the limiting and fixing of the door leaf.

10. The method for opening and closing the subway section protection sealed partition door of the glass fiber composite material according to any one of claims 1-9, characterized in that, Includes the following steps: 1) The protective airtight partition door remains in the normally open state, and its closing process is as follows: 1.1) The movable threshold is detachably installed on the lower threshold; 1.2) Activate the jack installed on the connecting housing of the door leaf to disengage the jack's protruding shaft from the fixing sleeve welded to the embedded plate; 1.3) Remove the top block of the safety device that is blocking the placement of the door leaf, so that the door leaf can rotate freely; 1.4) Rotate the door to the closed position; 1.5) Rotate the handwheel connected to the input shaft of the input reducer in the first direction, and drive the force transmission assembly consisting of the input reducer, the reducer reversing device, the threaded sleeve rotating rod, the lead screw, the transmission nut and the horizontal rod through the handwheel. The force transmission assembly drives the connecting plate to move horizontally, so that the lock head fixed on the connecting plate slides horizontally on the lock seat and extends out of the lock seat. 1.6) The lock head is inserted into the corresponding locking hole on the door frame to close the door. The door frame applies force to the door leaf through the lock head, so that the door leaf fits with the door frame and the movable threshold, and the sealing strips between the door frame and the door leaf, between the movable threshold and the door leaf, between the movable threshold and the track bed, and between the movable threshold and the track are compressed to achieve sealing. 2) The opening process of the protective airtight partition door is as follows: 2.1) Rotate the handwheel in a direction opposite to the first direction to disengage the lock head from the locking hole and retract it into the lock seat; 2.2) Pull the handle of the door leaf to rotate and open the door leaf to the predetermined position; 2.3) Move the door leaf to the safety device and use the limiting block and the top block on the embedded plate of the limiting pile cast in the civil structure to clamp and fix the door leaf together; 2.4) Activate the jack installed on the connecting shell of the door leaf, so that the protruding shaft of the jack is vertically inserted into the fixing sleeve welded on the pre-embedded plate, so as to realize the limiting fixation and support of the door leaf; 2.5) Remove the movable threshold from the lower threshold to restore subway traffic.

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