Smoke-proof device of refuge floor elevator hall and using method of smoke-proof device

Abstract

The invention discloses a smoke-proof device for an elevator hall of a refuge floor and a using method of the smoke-proof device, the smoke-proof device comprises a door-shaped sealing frame, a roller shutter assembly, a driving motor and a transmission assembly, the roller shutter assembly comprises a rolling shaft, fireproof cloth and a traction rod, a fireproof air bag structure composed of a first air bag and a second air bag is arranged in the sealing frame, and top-side-bottom three-dimensional sealing can be formed. According to the method, rapid unwinding of the fireproof cloth is achieved through electric driving, and an air bag is inflated to complete all-dimensional sealing; when power is cut off or the motor breaks down, the pull rope is pulled down to separate the transmission assembly, and the fireproof cloth is manually unwound through the gravity of the traction rod. Positive pressure smoke prevention is replaced by physical sealing, the smoke prevention device is free of chimney effect and wind interference, gets rid of power dependence, is simple in structure, convenient to maintain and stable and lasting in smoke prevention efficiency, effectively guarantees safety of the refuge storey, and is suitable for various high-rise building refuge storey elevator halls.

Description

Technical Field

[0001] This invention relates to the field of smoke control technology, and in particular to a smoke control device for elevator lobbies on refuge floors and its usage method. Background Technology

[0002] In the fire protection design of high-rise buildings, refuge floors are safe areas for temporary refuge during a fire. As vertical transportation hubs, the elevator lobbies must be effectively protected against smoke intrusion. Currently, smoke control solutions in this area mainly rely on mechanical pressurized ventilation systems in the elevator lobby. However, this system has certain shortcomings in practical application: 1. Mechanical pressurized air supply systems require large fans, complex ductwork, and electrical control systems, resulting in high construction costs and complete reliance on electric power. In the event of a power failure or control system malfunction, the entire smoke control system will be paralyzed and lose its protective function.

[0003] 2. To effectively block smoke, the system needs to maintain a stable positive pressure in the elevator lobby. However, excessive pressure will make it difficult to open fire doors, affecting personnel evacuation; insufficient pressure will fail to prevent smoke intrusion. In a fire, the simultaneous opening of doors on multiple floors will cause pressure imbalance and render the smoke control ineffective.

[0004] 3. The "chimney effect" of super high-rise buildings or external wind can seriously interfere with the airflow organization of pressurized air supply, which may lead to a significant decrease in system efficiency or even draw smoke into safe areas.

[0005] 4. Traditional building structures cannot completely seal elevator lobby doorways. When a "chimney effect" occurs in the lower elevator shaft, dense smoke can spread upwards through the gaps in the elevator lobby doors on the refuge floor, making it impossible to form an effective smoke-proof zone and posing a direct threat to the refuge area.

[0006] 5. Human error or construction issues such as air leakage in the ducts and fire doors being left open can cause the actual performance of the system to fall far short of the design expectations, making daily maintenance and supervision difficult. Summary of the Invention

[0007] The technical problem this invention aims to solve is that traditional mechanical pressurized air supply smoke prevention systems in the elevator lobbies of refuge floors in high-rise buildings suffer from high construction costs, reliance on electricity leading to easy failure, difficulty in pressure control, susceptibility to chimney effects and wind interference, poor doorway sealing, difficulty in maintenance and supervision, and actual smoke prevention effects that do not meet expectations, failing to effectively block the intrusion of smoke.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a smoke prevention device for an elevator hall in a refuge floor, comprising a door-shaped sealing frame arranged around the elevator hall exit, a roller shutter assembly fixed above the sealing frame, and a drive motor connected to one end of the roller shutter assembly. The roller shutter assembly includes a horizontally rotating take-up shaft, a fireproof cloth wound on the take-up shaft, and a traction rod fixedly connected to the movable end of the fireproof cloth. The traction rod is vertically slidably arranged inside the sealing frame. A fireproof airbag structure for squeezing the fireproof cloth and achieving end sealing is provided inside the sealing frame. A transmission component is provided between the drive motor and the roller shutter assembly.

[0009] Preferably, the sealing frame includes a top horizontal support assembly and vertical support assemblies that are vertically fixed to both ends of the horizontal support assembly. The horizontal support assembly has a through groove for the fireproof cloth to pass through.

[0010] Preferably, the vertical support assembly includes a vertically fixed trough, the end of the traction rod is attached to the inner wall of the trough, an installation groove is vertically opened on the opposite inner wall of the trough, a first airbag is arranged in the installation groove, and a vertical support air supply pipe for supplying air to the first airbag is connected to the outer wall of the trough. The first airbag is positioned directly opposite the edge of the fireproof cloth.

[0011] Preferably, the inner side of the groove is provided with a sliding channel with a T-shaped cross-section, and the end of the traction rod is slidably disposed in the sliding channel. When the first airbag is in the storage state, the entire first airbag is located in the mounting groove.

[0012] Preferably, the tank is provided with a cavity-shaped air supply channel, which is connected to the vertical support air supply pipe. The tank is also provided with airflow branches that connect the air supply channel and the first airbag at equal intervals along its length.

[0013] Preferably, a second airbag is horizontally fixedly connected to one side of the cross brace assembly, and a cross brace air supply pipe is fixedly connected to the outer wall of the cross brace assembly. The cross brace air supply pipe communicates with the second airbag. A pressure plate is fixedly connected to the movable end of the second airbag. The pressure plate is horizontally slidably arranged inside the cross brace assembly. The other side of the cross brace assembly is a vertical surface, and the fireproof cloth is located between the pressure plate and the vertical surface.

[0014] Preferably, the second airbag is arranged close to the cross brace assembly, and the cross brace air supply pipe is connected to all the second airbags through several branch pipes.

[0015] Preferably, the bottom end of the sealing frame is fixedly connected to a buried base, and the base is provided with a receiving groove for accommodating the traction rod, the diameter of the receiving groove being set to correspond to the size of the traction rod.

[0016] Preferably, the transmission assembly includes a housing, an input shaft and an output shaft rotatably connected to both ends of the housing, and a transmission block axially slidably connected between the input shaft and the output shaft. An adjustment unit is provided at the bottom of the housing to drive the transmission block to move horizontally and realize the switching of connection between the input shaft and the output shaft.

[0017] Preferably, one end of the input shaft is coaxially fixedly connected to a hexagonal prism-shaped connector, one end of the transmission block is coaxially provided with an adapter hole matching the connector, the other end of the transmission block is fixedly connected to a transmission rod, the end of the output shaft is fixedly connected to a connecting disc, the transmission rod passes through the connecting disc, and the output shaft, the output shaft and the connecting block are coaxially arranged.

[0018] Preferably, the adjusting unit includes a connecting ring fixedly connected to the movable end of the transmission rod, the connecting ring and the transmission block are located on both sides of the connecting plate, a first spring is sleeved on the transmission rod, the first spring is located between the connecting plate and the transmission block, a sliding groove is provided inside the housing, the sliding groove is arranged parallel to the axial direction of the input shaft, a separation push block is slidably arranged on the sliding groove, a pull rope is connected to one end of the separation push block facing the connecting ring, the separation push block is located below the connecting plate and the transmission block, and one end of the separation push block is set directly opposite the end wall of the connecting ring.

[0019] Preferably, a second spring is fixedly connected to the end of the separating push block away from the pull rope, and the two ends of the second spring are respectively connected to the inner sidewall of the separating push block and the housing.

[0020] A method for using a smoke prevention device in an elevator lobby of a refuge floor includes the following steps: Step 1: When the smoke control device is needed, control the drive motor to drive the winding shaft inside the winding device to rotate through the transmission component, so as to unwind the fireproof cloth. This causes the traction rod to pull the fireproof cloth down along the vertical support component under the action of gravity, and causes the traction rod to fall into the receiving groove at the top of the base. Step 2: Control the inflation devices corresponding to the vertical support assembly and the horizontal support assembly respectively, and inflate the first airbag and the second airbag through the vertical support air supply pipe and the horizontal support air supply pipe respectively. After the first airbag on both sides inside the vertical support assembly expands, it will clamp the two vertical edges of the fireproof cloth and keep them tightly attached. The second airbag in the horizontal support assembly pushes the pressure plate to clamp the top of the fireproof cloth. Through the expansion of the second airbag, the through groove in the horizontal support assembly is filled, thus completing the all-round fixation and edge sealing of the fireproof cloth.

[0021] Preferably, when the drive motor malfunctions or breaks down, pulling down the pull rope causes the separation push block to move. As the separation push block moves along the slide groove, it pushes the connecting disc to move. The connecting disc then drives the transmission block to move via the transmission rod, causing the transmission block to separate from the input shaft. After the self-locking of the drive motor is lost, the traction rod pulls the fireproof cloth downwards under the action of gravity to achieve manual unwinding.

[0022] Preferably, the connector and the adapter hole are clearance-fitted.

[0023] This invention provides a smoke prevention device for elevator lobbies on refuge floors and its usage method, which has the following beneficial effects.

[0024] 1. The first airbag of the vertical support component clamps the two sides of the fireproof cloth, the second airbag of the horizontal support component pushes the pressure plate to seal the top of the fireproof cloth, and the traction rod is embedded in the base receiving groove to seal the bottom, forming a three-dimensional sealing structure of top, side and bottom, which completely seals the gaps in the elevator hall door opening and effectively blocks the path of smoke spreading through the door gap; compared with the traditional smoke prevention method that relies on positive pressure, the present invention isolates smoke through physical sealing, and is not affected by the "chimney effect" of super high-rise buildings, external wind force and pressure imbalance caused by the opening of multiple floors. The smoke prevention performance is stable and long-lasting, and greatly improves the safety of the refuge floor area.

[0025] 2. It adopts a dual-mode design with electric drive and manual emergency operation. Under normal working conditions, the fireproof cloth can be quickly unrolled by the drive motor. In the event of a power failure or motor failure, the transmission component can be separated by pulling down the pull rope, so that the fireproof cloth can be automatically unrolled under the gravity of the traction rod. Smoke prevention deployment can be completed without electricity, which completely solves the problem of traditional mechanical pressurized air supply systems relying on electricity and being paralyzed by smoke prevention after failure, ensuring that the smoke prevention function does not fail in fire scenarios.

[0026] 3. No need for large fans, complex air ducts and precision electrical control systems, the overall structure is modularly designed; daily maintenance only requires checking the airbag sealing, transmission component flexibility and fireproof cloth condition, there is no need for complex maintenance such as air duct leakage and pressure calibration, and it avoids the impact of human factors such as fire doors being constantly open on the smoke prevention effect, reducing the difficulty of maintenance and supervision. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a structural front view of an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the internal structure of the vertical support component in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the cross brace assembly in an embodiment of the present invention.

[0030] Figure 4 This is a schematic diagram of the internal structure of the cross brace component in an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the internal structure of the transmission component in an embodiment of the present invention.

[0032] In the diagram: 1. Elevator lobby; 2. Vertical support assembly; 3. Horizontal support assembly; 4. Traction rod; 5. Rewind housing; 6. Fireproof cloth; 7. Transmission assembly; 8. Drive motor; 9. Base; 21. Mounting slot; 22. First airbag; 23. Vertical support air supply pipe; 24. Air supply channel; 25. Airflow branch; 31. Second airbag; 32. Pressure plate; 33. Horizontal support air supply pipe; 701. Input shaft; 702. Output shaft; 703. Transmission block; 704. Connector; 705. Adapter hole; 706. Connecting plate; 707. Transmission rod; 708. Connecting ring; 709. First spring; 710. Slide groove; 711. Separation push block; 712. Second spring; 713. Pull rope. Detailed Implementation

[0033] like Figures 1 to 5 As shown, the present invention provides a smoke prevention device for an elevator hall in a refuge floor, including a door-shaped sealing frame arranged around the exit of the elevator hall 1, a roller shutter assembly fixed above the sealing frame, and a drive motor 8 connected to one end of the roller shutter assembly. The roller shutter assembly includes a horizontally rotating take-up shaft, a fireproof cloth 6 wound on the take-up shaft, and a traction rod 4 fixedly connected to the movable end of the fireproof cloth 6. The traction rod 4 is vertically slidably arranged inside the sealing frame. The sealing frame is provided with a fireproof airbag structure for squeezing the fireproof cloth 6 and achieving end sealing. A transmission assembly 7 is provided between the drive motor 8 and the roller shutter assembly.

[0034] A sealing frame is arranged on the outside of the elevator hall 1 exit. When the fireproof cloth 6 is in the rolled-up state, the traction rod 4 is located at the inner top of the sealing frame. When the fireproof cloth 6 needs to seal the exit of the elevator hall 1, the fireproof cloth 6 is lowered to block the exit of the elevator hall 1. Then, the fireproof airbag inside the sealing frame is inflated, causing the fireproof airbag to expand and fill the gap between the edge of the fireproof cloth 6 and the sealing frame, while pressing the edge of the fireproof cloth 6 tightly. This not only fixes the fireproof cloth 6 but also enhances the sealing performance of the edge.

[0035] like Figures 1 to 4As shown. The sealing frame includes a top horizontal support assembly 3 and vertical support assemblies 2 fixedly connected to both ends of the horizontal support assembly 3. The horizontal support assembly 3 has a through groove for the fireproof cloth 6 to pass through. The fireproof cloth 6 is made of B1-grade fireproof non-woven fabric. The horizontal support assembly 3 limits the traction rod 4, preventing it from moving out of the sealing frame and ensuring that the traction rod 4 drives the fireproof cloth 6 to move accurately along the vertical support assembly 2.

[0036] like Figure 1 and Figure 2 As shown. The vertical support assembly 2 includes a vertically fixed groove. The end of the traction rod 4 is attached to the inner wall of the groove. A mounting groove 21 is vertically opened on the opposite inner wall of the groove. A first airbag 22 is arranged in the mounting groove 21. A vertical support air supply pipe 23 for supplying air to the first airbag 22 is connected to the outer wall of the groove. The first airbag 22 is positioned directly opposite the edge of the fireproof cloth 6. After the traction rod 4 moves to the bottom along the groove, the fireproof cloth 6 is completely lowered. Then, air is supplied to the vertical support air supply pipe 23 through an external inflation device, causing the first airbag 22 to inflate. The first airbag 22 evenly covers both sides of the fireproof cloth 6, and the oppositely arranged first airbags 22 can stably press the fireproof cloth 6, preventing the fireproof cloth 6 from shifting or curling.

[0037] like Figure 2 As shown, a T-shaped sliding channel is provided inside the groove. The end of the traction rod 4 is slidably disposed within the sliding channel. When the first airbag 22 is in the retracted state, the entire first airbag 22 is located within the mounting groove 21. Setting the sliding channel with a T-shaped cross-section ensures that the traction rod 4 is always in a horizontal state, ensuring the stability of the fireproof cloth 6 position.

[0038] like Figure 2 As shown, the tank contains a hollow air supply channel 24, which is connected to the vertical support air supply pipe 23. The tank also contains airflow branches 25 arranged equidistantly along its length, connecting the air supply channel 24 to the first airbag 22. Air is supplied to the first airbag 22 through these multiple airflow branches 25, causing the first airbag 22 to expand uniformly.

[0039] like Figure 3 and Figure 4As shown. A second airbag 31 is horizontally fixedly connected to one side of the inner side of the cross brace assembly 3. A cross brace air supply pipe 33 is fixedly connected to the outer wall of the cross brace assembly 3, communicating with the second airbag 31. A pressure plate 32 is fixedly connected to the movable end of the second airbag 31, and the pressure plate 32 is horizontally slidably arranged inside the cross brace assembly 3. The other side of the inner side of the cross brace assembly 3 is a vertical surface, and the fireproof cloth 6 is located between the pressure plate 32 and the vertical surface. Air is supplied to the second airbag 31 through the cross brace air supply pipe 33. During the expansion of the second airbag 31, it pushes the pressure plate 32 to move, pressing the fully expanded and vertically positioned fireproof cloth 6 tightly to prevent displacement due to inconsistent air pressure on both sides of the fireproof cloth 6, which could lead to sealing failure.

[0040] In a preferred embodiment of the present invention, the second airbag 31 is arranged closely along the cross brace assembly 3, and the cross brace air supply pipe 33 is connected to all the second airbags 31 through several branch pipes. Both the first airbag 22 and the second airbag 31 can adopt a multi-airbag structure. The multi-airbag structure ensures that adjacent airbags are closely attached, which can improve the uniformity of force application and enhance the sealing performance at the gaps.

[0041] like Figure 1 As shown. The bottom end of the sealing frame is fixedly connected to a buried base 9. The base 9 has a receiving groove for accommodating the traction rod 4, and the diameter of the receiving groove corresponds to the size of the traction rod 4. The base 9 is used to accommodate the traction rod 4 and allows the fireproof cloth 6 to completely cover the inner area of ​​the sealing frame.

[0042] like Figure 1 and Figure 5 As shown. The transmission assembly 7 includes a housing, an input shaft 701 and an output shaft 702 rotatably connected to both ends of the housing, and a transmission block 703 axially slidably connected between the input shaft 701 and the output shaft 702. An adjustment unit is provided at the bottom of the housing to drive the transmission block 703 to move horizontally and to switch the connection between the input shaft 701 and the output shaft 702. The input shaft 701 is coaxially fixedly connected to the output end of the drive motor 8, and the output shaft 702 is coaxially fixedly connected to one end of the winding shaft inside the winding shell 5. The winding and unwinding of the fireproof cloth 6 can be controlled by the drive motor 8 and the transmission assembly 7. When the drive motor 8 fails, the transmission block 703 is separated from the input shaft 701 by the adjustment unit. The transmission block 703 loses the self-locking of the motor output shaft, and then under the action of gravity, the traction rod 4 can drive the fireproof cloth 6 to automatically unwind.

[0043] like Figure 5As shown. One end of the input shaft 701 is coaxially fixedly connected to a hexagonal prism-shaped connector 704. One end of the transmission block 703 has a matching adapter hole 705 coaxially formed to match the connector 704. The other end of the transmission block 703 is fixedly connected to a transmission rod 707. The end of the output shaft 702 is fixedly connected to a connecting disc 706, and the transmission rod 707 passes through the connecting disc 706. The output shaft 701, output shaft 702, and connecting block 703 are coaxially arranged. The input shaft 701 is driven by the connector 704 and the transmission block 703, and the transmission block 703 is driven by the transmission rod 707 and the connecting disc 706.

[0044] like Figure 5 As shown. The adjustment unit includes a connecting ring 708 fixedly connected to the movable end of the transmission rod 707. The connecting ring 708 and the transmission block 703 are located on both sides of the connecting plate 706. A first spring 709 is sleeved on the transmission rod 707 and is located between the connecting plate 706 and the transmission block 703. A sliding groove 710 is provided inside the housing. The sliding groove 710 is arranged parallel to the axial direction of the input shaft 701. A separation push block 711 is slidably arranged on the sliding groove 710. A pull rope 713 is connected to one end of the separation push block 711 facing the connecting ring 708. The separation push block 711 is located below the connecting plate 706 and the transmission block 703, and one end of the separation push block 711 is positioned directly opposite the end wall of the connecting ring 708. By pushing the connecting ring 708 to the left by the separating push block 711, the connecting ring 708 drives the transmission block 703 to move to the left via the transmission rod 707, simultaneously compressing the first spring 709. During this movement, the connecting head 704 moves out of the adapter hole 705, the input shaft 701 separates from the transmission block 703, and the output shaft 702 loses the self-locking of the drive motor 8. The drive motor 8 is a motor with an electromagnetic brake. When powered on, the output shaft of the drive motor 8 can operate normally. When powered off or stopped, the brake engages the shaft through spring force, locking the output shaft of the drive motor 8.

[0045] like Figure 5 As shown. A second spring 712 is fixedly connected to the end of the separating push block 711 furthest from the pull rope 713. The two ends of the second spring 712 are respectively connected to the separating push block 711 and the inner wall of the housing. During the pulling of the pull rope 713, the separating push block 711 moves, stretching the second spring 712. As it moves, the separating push block 711 passes under the transmission block 703 and the connecting disc 706, and contacts the connecting ring 708. After the fireproof cloth 6 is unrolled, the separating push block 711 returns to its original position via the second spring 712. After the transmission block 703 is properly aligned with the input shaft 701, sufficient distance is maintained between the separating push block 711 and the connecting ring 708 to prevent the connecting ring 708 from constantly rubbing against the separating push block 711 during long-term rotation.

[0046] A method for using a smoke prevention device in an elevator lobby of a refuge floor includes the following steps: Step 1: When the smoke prevention device is needed, control the drive motor 8 to drive the winding shaft in the winding device 5 to rotate through the transmission component 7, so as to unwind the fireproof cloth 6, and cause the traction rod 4 to pull the fireproof cloth 6 down along the vertical support component 2 under the action of gravity, and cause the traction rod 4 to fall into the receiving groove at the top of the base 9. Step 2: Control the inflation devices corresponding to the vertical support assembly 2 and the horizontal support assembly 3 respectively, and inflate the first airbag 22 and the second airbag 31 through the vertical support air supply pipe 23 and the horizontal support air supply pipe 33 respectively. After the first airbag 22 on both sides inside the vertical support assembly 2 expands, it will clamp the two vertical edges of the fireproof cloth 6 and keep them tightly attached. The second airbag 31 in the horizontal support assembly 3 pushes the pressure plate 32 to clamp the top of the fireproof cloth 6. Through the expansion of the second airbag 31, the through groove in the horizontal support assembly 3 is filled, thus completing the all-round fixation and edge sealing of the fireproof cloth 6.

[0047] When the drive motor 8 malfunctions or breaks down, pulling down the pull rope 713 causes the separation push block 711 to move. As the separation push block 711 moves along the slide groove 710, it pushes the connecting plate 706 to move. The connecting plate 706 drives the transmission block 703 to move through the transmission rod 707, causing the transmission block 703 to separate from the input shaft 701. After losing the self-locking of the drive motor 8, the traction rod 4 pulls the fireproof cloth 6 downward under the action of gravity to achieve manual unwinding.

[0048] In a preferred embodiment of the present invention, to facilitate the connection between the connector 704 and the transmission block 703, the connector 704 and the adapter hole 705 are fitted with a clearance. By reducing the fitting precision, the connection efficiency is improved without affecting the transmission.

Claims

1. A smoke prevention device for an elevator lobby on a refuge floor, characterized in that: The assembly includes a door-shaped sealing frame arranged around the exit of the elevator hall (1), a roller shutter assembly fixed above the sealing frame, and a drive motor (8) connected to one end of the roller shutter assembly. The roller shutter assembly includes a horizontally rotating winding shaft, a fireproof cloth (6) wound on the winding shaft, and a traction rod (4) fixedly connected to the movable end of the fireproof cloth (6). The traction rod (4) is vertically slidably arranged inside the sealing frame. The sealing frame is provided with a fireproof airbag structure for squeezing the fireproof cloth (6) and achieving end sealing. A transmission assembly (7) is provided between the drive motor (8) and the roller shutter assembly.

2. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 1, characterized in that: The sealing frame includes a top horizontal support assembly (3) and vertical support assemblies (2) that are vertically fixed to both ends of the horizontal support assembly (3). The horizontal support assembly (3) has a through groove for the fireproof cloth (6) to pass through.

3. The smoke prevention device for the elevator lobby of a refuge floor as described in claim 2, characterized in that: The vertical support assembly (2) includes a vertically fixed groove, the end of the traction rod (4) is attached to the inner wall of the groove, and an installation groove (21) is vertically opened on the opposite inner wall of the groove. A first airbag (22) is arranged in the installation groove (21), and a vertical support air supply pipe (23) for supplying air to the first airbag (22) is connected to the outer wall of the groove. The first airbag (22) is set directly opposite the edge of the fireproof cloth (6).

4. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 3, characterized in that: The inner side of the groove is provided with a sliding channel with a T-shaped cross section. The end of the traction rod (4) is slidably disposed in the sliding channel. When the first airbag (22) is in the storage state, the entire first airbag (22) is located in the mounting groove (21).

5. The smoke prevention device for the elevator lobby of a refuge floor as described in claim 3, characterized in that: The tank is provided with a cavity-shaped air supply channel (24), which is connected to the vertical support air supply pipe (23). The tank is also provided with airflow branches (25) that connect the air supply channel (24) and the first airbag (22) at equal intervals along the length direction.

6. The smoke prevention device for the elevator lobby of a refuge floor as described in claim 2, characterized in that: The second airbag (31) is horizontally fixedly connected to one side of the cross brace assembly (3). The cross brace air supply pipe (33) is fixedly connected to the outer wall of the cross brace assembly (3). The cross brace air supply pipe (33) is connected to the second airbag (31). The movable end of the second airbag (31) is fixedly connected to a pressure plate (32). The pressure plate (32) is horizontally slidably arranged inside the cross brace assembly (3). The other side of the cross brace assembly (3) is a vertical surface. The fireproof cloth (6) is located between the pressure plate (32) and the vertical surface.

7. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 6, characterized in that: The second airbag (31) is arranged close to the cross brace assembly (3), and the cross brace air supply pipe (33) is connected to all the second airbags (31) through several branch pipes.

8. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 1, characterized in that: The bottom end of the sealing frame is fixedly connected to a buried base (9), and the base (9) is provided with a receiving groove for accommodating the traction rod (4), and the diameter of the receiving groove is set in accordance with the size of the traction rod (4).

9. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 1, characterized in that: The transmission assembly (7) includes a housing, an input shaft (701) and an output shaft (702) rotatably connected to both ends of the housing, and a transmission block (703) axially slidably connected between the input shaft (701) and the output shaft (702). An adjustment unit is provided at the bottom of the housing to drive the transmission block (703) to move horizontally and realize the switching of connection between the input shaft (701) and the output shaft (702).

10. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 9, characterized in that: One end of the input shaft (701) is coaxially fixedly connected to a hexagonal prism-shaped connector (704). One end of the transmission block (703) is coaxially provided with an adapter hole (705) that matches the connector (704). The other end of the transmission block (703) is fixedly connected to a transmission rod (707). The end of the output shaft (702) is fixedly connected to a connecting plate (706). The transmission rod (707) passes through the connecting plate (706). The output shaft (701), the output shaft (702), and the connecting block (703) are coaxially arranged.

11. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 10, characterized in that: The adjustment unit includes a connecting ring (708) fixedly connected to the movable end of the transmission rod (707). The connecting ring (708) and the transmission block (703) are located on both sides of the connecting plate (706). A first spring (709) is sleeved on the transmission rod (707). The first spring (709) is located between the connecting plate (706) and the transmission block (703). A sliding groove (710) is provided inside the housing. The sliding groove (710) is arranged parallel to the axial direction of the input shaft (701). A separation push block (711) is slidably arranged on the sliding groove (710). A pull rope (713) is connected to one end of the separation push block (711) facing the connecting ring (708). The separation push block (711) is located below the connecting plate (706) and the transmission block (703). One end of the separation push block (711) is set directly opposite the end wall of the connecting ring (708).

12. The smoke prevention device for an elevator lobby in a refuge floor as described in claim 11, characterized in that: The separation push block (711) is fixedly connected to a second spring (712) at one end away from the pull rope (713). The two ends of the second spring (712) are respectively connected to the separation push block (711) and the inner wall of the housing.

13. The method of using a smoke prevention device for an elevator lobby in a refuge floor as described in any one of claims 1-12, characterized in that: Includes the following steps: Step 1: When the smoke prevention device is needed, control the drive motor (8) to drive the winding shaft in the winding device (5) to rotate through the transmission component (7) to unwind the fireproof cloth (6), so that the traction rod (4) pulls the fireproof cloth (6) down along the vertical support component (2) under the action of gravity, and so that the traction rod (4) falls into the receiving groove at the top of the base (9); Step 2: Control the inflation devices corresponding to the vertical support assembly (2) and the horizontal support assembly (3) respectively, and inflate the first airbag (22) and the second airbag (31) through the vertical support air supply pipe (23) and the horizontal support air supply pipe (33) respectively. After the first airbag (22) on both sides of the interior of the vertical support assembly (2) expands, it will clamp the two vertical edges of the fireproof cloth (6) and keep them tightly attached. The second airbag (31) in the horizontal support assembly (3) pushes the pressure plate (32) to clamp the top of the fireproof cloth (6), and through the expansion of the second airbag (31), the through groove in the horizontal support assembly (3) is filled, thus completing the all-round fixation and edge sealing of the fireproof cloth (6).

14. The method of using the smoke prevention device in the elevator lobby of a refuge floor as described in claim 13, characterized in that: When the drive motor (8) malfunctions or breaks down, the pull rope (713) is pulled down, and the pull rope (713) drives the separation push block (711) to move. During the movement of the separation push block (711) along the slide groove (710), it pushes the connecting plate (706) to move. The connecting plate (706) drives the transmission block (703) to move through the transmission rod (707), so that the transmission block (703) is separated from the input shaft (701). After losing the self-locking of the drive motor (8), the traction rod (4) pulls the fireproof cloth (6) downward under the action of gravity to realize manual unwinding.

15. The method of using the smoke prevention device in the elevator lobby of a refuge floor as described in claim 14, characterized in that: The connector (704) and the adapter hole (705) are fitted with a clearance.

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