Fireproof cover for stairs

Abstract

The present application relates to the technical field of fire safety, and discloses a fireproof cover plate for automatically closing stairs when fire occurs to prevent fire from spreading in a wooden structure house, which comprises a fireproof stair cover plate, a counterweight, a fixed block one and a mounting block. The counterweight is driven to descend by high-temperature melting of paraffin to remove the support of the counterweight, which drives the traction to synchronously drag the limiting pin to complete the unlocking action. The offset of the rope is constrained by multiple sets of guide members, the locking and constraint of the cover plate are completely released, the cover plate can be smoothly turned and closed along the hinged structure, the vertical smoke and fire passage of the stairs is completely isolated, and the upward opening of the partition caused by the hot air current can be avoided to cause the fire to jump, so that the convection spread of the fire on the floor is long-acting blocked. In addition, the constant downward pressure of the rope on the cover plate caused by the continuous descent of the counterweight can realize gapless airtight blocking, meet the unattended fireproofing requirements of the wooden structure house, and the external power supply and manual on-site operation are not required, which further improves the passive protection reliability of the residential fire.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, specifically to a fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures. Background Technology

[0002] my country has a large number of traditional wooden structures. Wooden components are flammable. After a fire breaks out, hot air and flames will spread rapidly to the upper floors along the stairwell. If no one is home, people cannot enter the high-temperature fire area to manually close the fireproof partitions. Air convection between floors will accelerate the spread of the fire, which can easily cause the entire house to burn down, posing a very high risk to property and personal safety.

[0003] Existing conventional fireproof staircase covers all rely on manual opening and closing. At fire scenes, temperatures can reach over 100 degrees Celsius. Dense smoke and high temperatures hinder manual operation, making it impossible to seal staircase openings in time during the early stages of a fire. They also cannot effectively prevent the vertical spread of smoke and fire, posing significant safety defects. Therefore, we have introduced fireproof staircase covers that automatically close upon contact with fire to prevent the spread of fire in wooden structures. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden houses. It has the advantages of automatically sealing staircase passages at high temperatures and providing simultaneous audible and visual warnings in case of fire, thus solving the problems mentioned in the background technology.

[0005] This invention provides the following technical solution: a fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, comprising a fireproof staircase cover, a counterweight, a first fixing block, and an installation block. The outer wall of the fireproof staircase cover is provided with a hinge. The outer wall of the counterweight has a pre-drilled hole and a polypropylene paraffin pin. A guide ring is provided at the top of the counterweight. A traction rope is provided on the outer wall of the fireproof staircase cover. A second fixing block and a limiting block are fixedly installed on the outer wall of the fireproof staircase cover. The outer wall of the fireproof staircase cover also has a guide hole.

[0006] As a preferred embodiment of the present invention: a buzzer is fixedly mounted on the bottom of the mounting block, a cylinder is fixedly mounted on the bottom of the buzzer, a fixing rod is fixedly mounted on the outer wall of the buzzer, an electrode plate and an electrode plate are respectively provided on the inner wall of the cylinder, a glass bottle is provided at the bottom of the fixing rod, a spring is sleeved on the outer wall of the glass bottle, a corrugated telescopic tube is provided at the bottom of the cylinder, a one-way valve is installed on the outer wall of the corrugated telescopic tube, a fixing rod is provided at the end of the corrugated telescopic tube away from the one-way valve, and an air outlet is opened at the top of the corrugated telescopic tube.

[0007] As a preferred technical solution of the present invention: the hinge is made of self-tapping screws, there are three hinges, and the three hinges are evenly arranged along the side of the fireproof stair cover plate. The two ends of the three hinges are respectively fixed to the fireproof stair cover plate and the wooden stairwell wall panel. The fireproof stair cover plate can be freely flipped open and closed around the hinges.

[0008] As a preferred technical solution of the present invention: the counterweight is precast in one piece of concrete, and one end of the traction rope is pre-embedded and fixed inside the counterweight; the outer wall of the polypropylene paraffin pin is respectively connected to the inner wall of the counterweight and the inner wall of the wooden stairwell wall panel, and the shape of the outer wall of the polypropylene paraffin pin is adapted to the shape of the inner wall of the reserved hole.

[0009] As a preferred technical solution of the present invention: the guide ring is a self-tapping screw with a metal ring, and the guide ring is locked and fixed to the corner of the fireproof staircase cover plate near the staircase entrance. The traction rope passes through the inner wall of the guide ring, fixing block one, fixing block two, limiting block and guide hole in sequence. A limiting pin is provided on the outer wall of the end of the traction rope that passes through the inner wall of fixing block one. The outer wall diameter of the limiting pin end of the traction rope is larger than the diameter of the inner wall circular hole of fixing block one.

[0010] As a preferred technical solution of the present invention: the end of the mounting block away from the buzzer is fixedly installed on the wall panel of the wooden stairwell, and there are two glass bottles and two springs, and each glass bottle and spring forms a single-sided piece, and the two single-sided pieces are symmetrically arranged with the corrugated expansion tube as the center.

[0011] As a preferred embodiment of the present invention: the inner cavity of the glass bottle is filled with liquid, and the boiling point of the liquid in the inner cavity of the glass bottle is lower than the melting point of polypropylene paraffin. The glass bottle is disposed between two fixing rods, one end of the spring is connected to the bottom of the fixing rod, and the other end of the spring is connected to the top of the fixing rod. One end of the corrugated telescopic tube is connected and fixed to the bottom of the cylinder, and the other end of the corrugated telescopic tube is connected and fixed to the top of the fixing rod. The outlet end of the one-way valve is connected to the inlet end of the corrugated telescopic tube. The top opening of the outlet hole corresponds to the bottom protrusion of the electrode plate.

[0012] As a preferred embodiment of the present invention: the first electrode and the second electrode are respectively concave in shape, and the second electrode is electrically connected to the buzzer.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This fireproof staircase cover, which automatically closes upon contact with fire to prevent the spread of fire in wooden structures, works by melting paraffin wax at high temperatures to release the counterweight support, causing the counterweight to fall and pull the limit pin to complete the unlocking action. Relying on multiple sets of guide components to restrain the rope deviation, the locking restraint of the cover is completely released, allowing it to smoothly flip and close along the hinged structure. This completely isolates the vertical smoke and fire passage of the staircase and prevents hot air from pushing the partition upward and causing fire to spread. This effectively inhibits the convection and spread of fire between floors. In addition, the continuous falling of the counterweight applies constant downward pressure through the rope to press the cover tightly, achieving a seamless and airtight barrier. This meets the fire protection requirements of unattended wooden structures, requires no external power supply or on-site manual operation, and further improves the reliability of passive fire protection in residential buildings.

[0014] 2. This fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures utilizes the high temperature of the fire scene to drive the vaporization and expansion of the medium inside the cylinder, causing it to burst. During this process, a spring pushes the matching rod to simultaneously compress the telescopic pipe, pushing the heated and expanded gas inside the pipe to the electrode assembly. This causes the concave electrode to be squeezed by the gas pressure to align with the protruding electrode, thus conducting electricity and activating the power supply circuit of the buzzer device to issue a fire warning. It can also rely on the cooling medium leaking from the broken cylinder to spray the staircase area, thereby slowing the upward spread of flames along the passage. This meets the early warning and protection needs of unmanned wooden structures and requires no additional power supply lines or manual intervention. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the fireproof staircase cover plate structure of the present invention; Figure 3 This is a schematic diagram of the structure on the other side of the present invention; Figure 4 This is a schematic diagram of the stairwell structure of the present invention; Figure 5 This is a schematic diagram of the early warning structure of the present invention; Figure 6 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0016] In the diagram: 1. Fireproof staircase cover plate; 2. Hinge; 3. Counterweight; 4. Reserved hole; 5. Polypropylene paraffin pin; 6. Guide ring; 7. Fixing block one; 8. Traction rope; 9. Fixing block two; 10. Limiting block; 11. Guide hole; 12. Mounting block; 13. Buzzer; 14. Cylinder; 15. Fixing rod one; 16. Electrode plate one; 17. Electrode plate two; 18. Glass bottle; 19. Spring; 20. Corrugated telescopic tube; 21. One-way valve; 22. Vent; 23. Fixing rod two. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 - Figure 6 Fireproof staircase covers that automatically close upon contact with fire to prevent the spread of fire in wooden structures include a fireproof staircase cover 1, a counterweight 3, a fixing block 7, and an installation block 12. The outer wall of the fireproof staircase cover 1 is provided with a hinge 2. The outer wall of the counterweight 3 is provided with a reserved hole 4. The outer wall of the counterweight 3 is provided with a polypropylene paraffin pin 5. The top of the counterweight 3 is provided with a guide ring 6. The outer wall of the fireproof staircase cover 1 is provided with a traction rope 8. The outer wall of the fireproof staircase cover 1 is fixedly installed with a fixing block 9 and a limiting block 10. The outer wall of the fireproof staircase cover 1 is provided with a guide hole 11. In the above structure, at room temperature, polypropylene paraffin pins 5 are inserted into the wall through the pre-drilled holes 4 of the counterweight block 3 to form a rigid support, locking the counterweight block 3 to the wall at the floor junction. The counterweight block 3 pulls the traction rope 8, which is guided by the guide ring 6 and the guide hole 11, and then locked into the interior of the fixing block 7 and the fixing block 9 by the end limiting pin. The limiting pin is blocked by the fixing block 7 and cannot be removed. The traction rope 8 continues to pull the fireproof staircase cover 1 taut, and the hinge support of the hinge 2 keeps the fireproof staircase cover 1 in an upward-opening passage state. When the high temperature of the fire causes the polypropylene paraffin pins 5 to melt and lose their support and restraint, the counterweight block 3 relies on its own strength to release the fire. As the weight falls vertically downwards, the counterweight 3 continues to pull the traction rope 8, which in turn pulls the limiting pin out of the fixed block 7 and fixed block 9. The limiting pin slides to the limiting block 10 and stops. After the fireproof staircase cover plate 1 loses the locking force of the traction rope 8, it rotates downwards around the hinge 2 under the continuous downward pulling force of the counterweight 3, completely covering and blocking the vertical passage of the staircase. The counterweight 3 continues to fall, tightening the traction rope 8 and forming a downward pressing force on the fireproof staircase cover plate 1, which counteracts the upward pushing force of the rising hot air in the fire, keeping the staircase passage completely sealed and blocking the convection and diffusion of flames and high-temperature smoke between floors.

[0019] In a preferred embodiment: a buzzer 13 is fixedly mounted on the bottom of the mounting block 12, a cylinder 14 is fixedly mounted on the bottom of the buzzer 13, a fixing rod 15 is fixedly mounted on the outer wall of the buzzer 13, an electrode plate 16 and an electrode plate 17 are respectively provided on the inner wall of the cylinder 14, a glass bottle 18 is provided at the bottom of the fixing rod 15, a spring 19 is sleeved on the outer wall of the glass bottle 18, a corrugated telescopic tube 20 is provided at the bottom of the cylinder 14, a one-way valve 21 is installed on the outer wall of the corrugated telescopic tube 20, a fixing rod 23 is provided at the end of the corrugated telescopic tube 20 away from the one-way valve 21, and an air outlet 22 is opened at the top of the corrugated telescopic tube 20. In the above structure, the entire alarm mechanism is fixed to the wall through which the hot air flows by the mounting block 12. The cylinder 14 serves as a supporting base, simultaneously fixing the buzzer 13 and the first fixing rod 15. At room temperature, the glass bottle 18 is clamped between the first fixing rod 15 and the second fixing rod 23. The spring 19 sleeved on the outer wall of the glass bottle 18 is supported and compressed by the glass bottle 18 to store energy. The first electrode plate 16 and the second electrode plate 17 separate and disconnect the power supply circuit of the buzzer 13. After the high temperature of the fire is transmitted to the inside of the cylinder 14, the liquid inside the glass bottle 18 boils and expands and breaks. The spring 19 loses the support of the glass bottle 18 and is released from its stretched state, causing the glass bottle 18 to be compressed. The compressed glass bottle 18 will then drive the second fixing rod. 23 moves towards the cylinder 14 and compresses the corrugated telescopic tube 20, causing the gas inside the corrugated telescopic tube 20 to be transported to the inner cavity of the cylinder 14 through the vent 22. This causes the electrode plate 17, which was initially concave, to deform under the pressure of the gas, becoming convex. The convex end of the electrode plate 17 contacts the bottom of the electrode plate 16, triggering the electrode plate 16 to send an activation signal to the buzzer 13, which then alerts personnel. At the same time, when the glass bottle 18 breaks, the liquid inside the glass bottle 18 will spray out and reach the stairwell, thus slowing the spread of the fire and facilitating the safe escape of personnel.

[0020] In a preferred embodiment: the hinge 2 is made of self-tapping screws, there are three hinges 2, and the three hinges 2 are evenly arranged along the side of the fireproof stair cover 1. The two ends of the three hinges 2 are respectively fixed to the fireproof stair cover 1 and the wooden stair opening wall panel. The fireproof stair cover 1 can be freely flipped open and closed around the hinges 2. In the above structure, three sets of self-tapping screw hinges 2 are evenly distributed along the side of the fireproof staircase cover plate 1. The two ends of the hinges 2 are rigidly locked to the wall panel and the cover plate respectively. The three sets of hinges 2 simultaneously form a rotating hinge pair, providing a uniform rotation fulcrum for the fireproof staircase cover plate 1. Under normal conditions, the locking tension of the traction rope 8 acts on the side of the cover plate. The three sets of hinges 2 evenly distribute the cover plate's self-weight and traction force, supporting the cover plate to remain stable in the upward-opening state. When the traction rope 8 is unlocked and the tension is released, the counterweight 3 pulls the traction rope 8 downward. The traction rope 8 forms a downward torque on the cover plate, causing the fireproof staircase cover plate 1 to rotate and flip downward synchronously around the three sets of hinges 2 as the axis. The multiple fulcrums evenly distribute the force to avoid the cover plate getting stuck or shifting on one side, ensuring that the cover plate falls smoothly and completely seals the staircase passage. In a preferred embodiment: the counterweight 3 is precast as a single piece of concrete, and one end of the traction rope 8 is pre-embedded and fixed inside the counterweight 3; the outer wall of the polypropylene paraffin pin 5 is respectively connected to the inner wall of the counterweight 3 and the inner wall of the wooden stairwell wall panel, and the shape of the outer wall of the polypropylene paraffin pin 5 is adapted to the shape of the inner wall of the reserved hole 4. In the above structure, the counterweight block 3 is integrally cast with concrete. During the casting stage, the end of the traction rope 8 is pre-embedded and solidified inside the counterweight block 3, realizing the rigid transmission between the downward force of the counterweight block 3 and the traction rope 8. The shape of the polypropylene paraffin pin 5 is perfectly matched with the inner wall of the reserved hole 4 of the counterweight block 3. The polypropylene paraffin pin 5 passes through the reserved hole 4 and is inserted into the pre-embedded hole in the wall, forming a horizontal limiting support for the counterweight block 3, preventing the counterweight block 3 from moving downward and maintaining the tension and locking state of the traction rope 8. When the ambient temperature reaches the melting temperature range of the polypropylene paraffin pin 5, the polypropylene paraffin pin 5 melts and flows away due to heat. The counterweight block 3 loses its axial support constraint and moves vertically downward by the weight of the concrete. At the same time, it drags the pre-embedded traction rope 8 downward as a whole, outputting the traction power required to unlock the cover plate, and completing the conversion from thermal triggering to gravity mechanical power.

[0021] In a preferred embodiment: the guide ring 6 is a self-tapping screw with a metal ring, and the guide ring 6 is locked and fixed to the corner of the fireproof staircase cover plate 1 near the staircase entrance. The traction rope 8 passes through the inner walls of the guide ring 6, fixing block 1 7, fixing block 2 9, limiting block 10 and guide hole 11 in sequence. A limiting pin is provided on the outer wall of the end of the traction rope 8 that passes through the inner wall of fixing block 1 7. The outer wall diameter of the limiting pin end of the traction rope 8 is larger than the inner wall diameter of the circular hole of fixing block 1 7. In the above structure, the guide ring 6 with a metal ring is fixed to the corner of the cover plate by a self-tapping screw, which controls the direction of the traction rope 8. The traction rope 8 passes through the guide ring 6, fixing block 1 7, fixing block 2 9, limiting block 10, and guide hole 11 in sequence to form a linear transmission path. A limiting pin is set at the end of the traction rope 8 near fixing block 1 7. The outer diameter of the limiting pin is larger than the inner diameter of the fixing block 1 7. At room temperature, the limiting pin is stuck on the outer end face of fixing block 1 7 and cannot pass through, thereby locking the stroke of the traction rope 8 and keeping the fireproof stair cover plate 1 open. When the counterweight 3 falls down and pulls the traction rope 8, the traction rope 8 slides linearly along the inner wall of each guide hole, pulling the limiting pin away from the locking position of fixing block 1 7. The constraint stroke of the traction rope 8 is completely released, and it continues to pull the fireproof stair cover plate 1 to rotate and close around the hinge 2. Each guide component restricts the left and right deviation of the traction rope 8, ensuring that the traction force is transmitted linearly and stably without deviation.

[0022] In a preferred embodiment: the end of the mounting block 12 away from the buzzer 13 is fixedly installed on the wall panel of the wooden stairwell. There are two glass bottles 18 and two springs 19. Each glass bottle 18 and spring 19 forms a single-sided piece. The two single-sided pieces are symmetrically arranged with the corrugated expansion tube 20 as the center. In the above structure, the entire alarm mechanism is rigidly fixed to the wall at the stairwell by the mounting block 12. The two sets of glass bottles 18 and springs 19 are symmetrically arranged with the corrugated telescopic tube 20 as the center, forming two independent synchronous triggering transmission units. When one side of the glass bottle 18 is heated and breaks, the corresponding spring 19 rebounds and pushes the fixing rod 23 to compress the corrugated telescopic tube 20. When both sides of the glass bottle 18 break synchronously, the two sets of springs 19 apply a pushing force to each other in a synchronous manner, and the corrugated telescopic tube 20 is squeezed evenly in both directions to make it axially and smoothly contract, and synchronously drive the electrode plates 16 and 17 on both sides to stick together and conduct the circuit; thus greatly improving the triggering reliability of the high temperature alarm mechanism.

[0023] In a preferred embodiment: the inner cavity of the glass bottle 18 is filled with liquid, and the boiling point of the liquid in the inner cavity of the glass bottle 18 is lower than the melting point of the polypropylene paraffin pin 5. The glass bottle 18 is disposed between the first fixing rod 15 and the second fixing rod 23. One end of the spring 19 is connected to the bottom of the first fixing rod 15, and the other end of the spring 19 is connected to the top of the second fixing rod 23. One end of the corrugated telescopic tube 20 is connected and fixed to the bottom of the cylinder 14, and the other end of the corrugated telescopic tube 20 is connected and fixed to the top of the second fixing rod 23. The outlet end of the one-way valve 21 is connected to the inlet end of the corrugated telescopic tube 20. The top opening of the vent 22 is correspondingly provided to the bottom protrusion of the second electrode plate 17. In the above structure, a low-boiling-point liquid is filled into the inner cavity of the glass bottle 18. The boiling temperature of the liquid is lower than the melting temperature of the polypropylene paraffin tin 5. When the fire heats up, the liquid vaporizes first, increasing pressure and cracking the glass bottle 18, thus triggering the alarm mechanism earlier than the fireproof cover mechanism. The glass bottle 18 is sandwiched between the first fixed rod 15 and the second fixed rod 23. The two ends of the spring 19 are respectively connected between the first fixed rod 15 and the second fixed rod 23. The two ends of the corrugated telescopic tube 20 are respectively connected to the bottom of the cylinder 14 and the second fixed rod 23. The one-way valve 21 and the vent 22 connect the inner cavity of the corrugated telescopic tube 20 and the inside of the cylinder 14. After the glass bottle 18 breaks, the spring 19 rebounds and pushes the second fixed rod 23 downward, causing the corrugated telescopic tube 20 to be axially compressed. The gas in the tube rushes into the inner cavity of the cylinder 14 through the vent 22, pushing the electrode plate 2 17 to deform, thereby triggering the buzzer 13 to start and issue a warning.

[0024] In a preferred embodiment: electrode sheet 16 and electrode sheet 17 are respectively concave in shape, and electrode sheet 17 is electrically connected to buzzer 13. In the above structure, both electrode plate 16 and electrode plate 17 are provided with concave mating surfaces. Electrode plate 17 is stably electrically connected to buzzer 13. After the corrugated telescopic tube 20 is compressed, the internal gas pushes electrode plate 17 upward through the vent 22, causing its concave surface to deform under force. The protrusion contacts the bottom of electrode plate 16, thereby enabling electrode plate 16 to trigger the start of buzzer 13 and ensure that the fire alarm sounds continuously and stably.

[0025] Working principle: First, the polypropylene paraffin pin 5 penetrates the reserved hole 4 of the counterweight block 3 and is inserted into the pre-embedded hole in the wall. The paraffin solidifies at room temperature to form a rigid support, suspending and limiting the counterweight block 3 on the wall at the junction of the floor slab. One end of the traction rope 8 is pre-embedded and fixed inside the counterweight block 3, and the other end is turned by the guide ring 6, passing through the guide hole 11, the limiting block 10, the second fixing block 9, and the first fixing block 7 in sequence. The large-diameter limiting pin at the end is stuck on the outside of the first fixing block 7 and cannot pass through the inner hole. The traction rope 8 is taut throughout the process. Three sets of evenly arranged hinges 2 serve as rotation fulcrums. Under the tension of the traction rope 8, the fireproof staircase cover 1 is stably flipped upward, and the staircase passage is fully opened, allowing people to pass up and down normally. The mounting block 12 fixes the entire alarm assembly to the floor wall through which the hot air flow must pass. Inside the cylinder 14, two sets of glass bottles 18 are clamped between fixing rod 15 and fixing rod 23. The spring 19 is axially supported and compressed by the glass bottles 18, storing elastic potential energy. Electrode 16 and electrode 27 are separated from each other, the power supply circuit of the buzzer 13 is disconnected, and there is no alarm sound. The corrugated telescopic tube 20 is in a naturally extended state, there is no high-pressure gas inside the tube, and the one-way valve 21 remains closed, preventing external air and smoke from flowing back into the cylinder 14. The high-temperature hot airflow generated in the fire flows upward along the stairs, and the heat is transferred to the inside of the alarm mechanism cylinder 14. The low-boiling-point liquid filled in the inner cavity of the glass bottle 18 is heated and vaporized first, and the gas pressure inside the bottle rises sharply, cracking the glass bottle 18. After the glass bottle 18 breaks, it loses its support and constraint on the spring 19. Spring 19 releases its elastic rebound force, pushing the fixing rod 23 downwards, causing the corrugated telescopic tube 20 to compress and contract axially towards the cylinder 14; the gas inside the corrugated telescopic tube 20, heated and expanding, rushes into the inner cavity of the cylinder 14 through the top vent 22, and the gas continues to push the electrode plate 17 upwards. The originally concave electrode plate 17 bulges under the force, and the bulging part comes into contact with the electrode plate 16, instantly completing the conductive circuit. Current is transmitted to the buzzer 13, which continuously emits an audible and visual warning to promptly alert nearby personnel to the fire; at the same time, the liquid inside the shattered glass bottle 18 sprays outwards and flows onto the surface of the stair treads. The liquid absorbs heat and cools down, slowing the upward spread of the flames along the stairs and providing buffer time for personnel evacuation; the hot air continues to rise When the temperature reaches the melting range of the polypropylene paraffin pin 5, the polypropylene paraffin pin 5 melts into a liquid state and loses its rigid support and restraint on the counterweight block 3. The concrete integrally formed counterweight block 3 falls vertically downwards under its own weight, simultaneously dragging the traction rope 8 embedded inside downwards. The traction rope 8 slides linearly along the inner wall of the guide ring 6, guide hole 11, limit block 10, fixing block 2 9, and fixing block 1 7, dragging the end limit pin outwards from the locking position of fixing block 1 7, and the locking force of the traction rope 8 on the fireproof staircase cover plate 1 is completely released. After the fireproof staircase cover plate 1 loses its traction restraint, under the action of the continuous downward pulling force of the counterweight block 3, it smoothly flips downwards with the three sets of evenly arranged hinges 2 as synchronous rotation fulcrums, completely covering and blocking the vertical passage of the staircase.The three sets of hinges 2 evenly distribute the weight of the cover plate and the traction force, preventing the cover plate from jamming or shifting on one side, ensuring a seamless seal. After the fireproof staircase cover plate 1 is fully closed, the counterweight block 3 does not touch the ground and continues to maintain a downward pulling force, continuously tightening the traction rope 8, forming a constant downward pressing force on the fireproof staircase cover plate 1. The high-temperature hot airflow surging upward inside the fire cannot push the cover plate open, and the staircase passage is completely sealed, blocking the convection exchange of flames, high-temperature smoke, and sparks between the first and second floors, preventing the rapid longitudinal spread of the fire.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, comprising a fireproof staircase cover (1), a counterweight (3), a fixing block (7), and an installation block (12), characterized in that: The outer wall of the fireproof staircase cover plate (1) is provided with a hinge (2), the outer wall of the counterweight block (3) is provided with a reserved hole (4), the outer wall of the counterweight block (3) is provided with a polypropylene paraffin pin (5), the top of the counterweight block (3) is provided with a guide ring (6), the outer wall of the fireproof staircase cover plate (1) is provided with a traction rope (8), the outer wall of the fireproof staircase cover plate (1) is fixedly installed with a fixing block two (9) and a limiting block (10), and the outer wall of the fireproof staircase cover plate (1) is provided with a guide hole (11).

2. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 1, is characterized in that: A buzzer (13) is fixedly mounted on the bottom of the mounting block (12). A cylinder (14) is fixedly mounted on the bottom of the buzzer (13). A fixing rod (15) is fixedly mounted on the outer wall of the buzzer (13). An electrode plate (16) and an electrode plate (17) are respectively provided on the inner wall of the cylinder (14). A glass bottle (18) is provided at the bottom of the fixing rod (15). A spring (19) is sleeved on the outer wall of the glass bottle (18). A corrugated telescopic tube (20) is provided at the bottom of the cylinder (14). A one-way valve (21) is installed on the outer wall of the corrugated telescopic tube (20). A fixing rod (23) is provided at the end of the corrugated telescopic tube (20) away from the one-way valve (21). An air outlet (22) is opened at the top of the corrugated telescopic tube (20).

3. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 1, is characterized in that: The hinge (2) is made of self-tapping screws. There are three hinges (2), and the three hinges (2) are evenly arranged along the side of the fireproof stair cover plate (1). The fireproof stair cover plate (1) and the wooden stair opening wall are fixed at both ends of the three hinges (2). The fireproof stair cover plate (1) can be freely flipped and opened around the hinges (2).

4. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 1, is characterized in that: The counterweight (3) is precast in one piece of concrete, and one end of the traction rope (8) is embedded and fixed inside the counterweight (3). The outer wall of the polypropylene paraffin pin (5) is connected to the inner wall of the counterweight (3) and the inner wall of the wooden stairwell wall panel, respectively. The shape of the outer wall of the polypropylene paraffin pin (5) is adapted to the shape of the inner wall of the reserved hole (4).

5. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 1, is characterized in that: The guide ring (6) is a self-tapping screw with a metal ring, and the guide ring (6) is locked and fixed to the corner of the fireproof staircase cover plate (1) near the staircase entrance. The traction rope (8) passes through the inner wall of the guide ring (6), fixing block one (7), fixing block two (9), limiting block (10) and guide hole (11) in sequence. The outer wall of the end of the traction rope (8) that passes through the inner wall of fixing block one (7) is provided with a limiting pin. The outer wall diameter of the limiting pin end of the traction rope (8) is larger than the inner wall diameter of the circular hole of fixing block one (7).

6. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden houses according to claim 2, characterized in that: The mounting block (12) is fixedly installed on the wall panel of the wooden stairwell at the end away from the buzzer (13). There are two glass bottles (18) and two springs (19), and each glass bottle (18) and spring (19) forms a single-sided piece. The two single-sided pieces are symmetrically arranged with the corrugated expansion tube (20) as the center.

7. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 2, is characterized in that: The inner cavity of the glass bottle (18) is filled with liquid, and the boiling point of the liquid in the inner cavity of the glass bottle (18) is lower than the melting point of the polypropylene paraffin pin (5). The glass bottle (18) is positioned between the first fixing rod (15) and the second fixing rod (23). One end of the spring (19) is connected to the bottom of the first fixing rod (15), and the other end of the spring (19) is connected to the top of the second fixing rod (23). One end of the corrugated telescopic tube (20) is connected and fixed to the bottom of the cylinder (14), and the other end of the corrugated telescopic tube (20) is connected and fixed to the top of the second fixing rod (23). The outlet end of the one-way valve (21) is connected to the inlet end of the corrugated telescopic tube (20). The top opening of the vent (22) is correspondingly set to the bottom protrusion of the electrode plate (17).

8. The fireproof staircase cover that automatically closes upon contact with fire to prevent the spread of fire in wooden structures, as described in claim 2, is characterized in that: The first electrode (16) and the second electrode (17) are concave in shape, and the second electrode (17) is electrically connected to the buzzer (13).

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