Composite fireproof door based on cloud alarm platform

Abstract

This invention relates to the field of fire door technology, specifically a composite fire door based on a cloud alarm platform. It includes a door body, a latch, a latch connecting plate, a door closer, a door handle, a connecting block, a switching mechanism, a locking mechanism, and a reset mechanism. The door handle is rotatably mounted on the door body. A connecting block that cooperates with the door handle is slidably mounted inside the door body. A switching mechanism that cooperates with the connecting block is connected to the door handle. The door closer is located on the door body. A locking mechanism that cooperates with the door closer is connected to the connecting block. A reset mechanism that cooperates with the door closer is located inside the door body. This invention limits the door's position by controlling the locking mechanism's restriction of the door closer's hinge rotation through counter-clockwise rotation of the door handle, allowing normal entry of people. In the event of a fire, the reset mechanism triggers, closing the door and effectively preventing the spread of fire.

Description

Technical Field

[0001] This invention relates to the field of fire door technology, specifically to a composite fire door based on a cloud alarm platform. Background Technology

[0002] In today's society, with the rapid development of science and technology and continuous economic growth, people's living standards have significantly improved. The pursuit of material enjoyment and quality of life has gradually become a mainstream social trend. However, this has also brought with it a deeper concern and focus on safety issues. While pursuing a higher quality of life, people are also paying more attention to the safety of their living environment, especially in the face of emergencies, particularly fire.

[0003] With the advancement of urbanization, high-rise buildings, commercial centers, and residential communities have sprung up in cities, becoming important places for people's daily lives. However, the convenience and comfort brought by these buildings are also accompanied by more safety hazards, especially fire risks. Fire, as a sudden and highly dangerous disaster, can not only cause casualties but also lead to huge property losses. Therefore, fire doors, as a mandatory requirement in building construction, have received more attention.

[0004] Fire doors are not merely a safety measure to comply with regulations; they are essential for providing escape routes and time during a fire. By effectively preventing the spread of fire, fire doors offer invaluable protection for people's lives and provide firefighters with the necessary time to extinguish the blaze. However, in places like large shopping malls and residential buildings, normally closed fire doors often obstruct the normal flow of people. Staff frequently place heavy objects to block the doors, creating significant resistance that prevents the door closers from closing. When a fire occurs, the fire door remains open due to this obstruction, preventing it from closing automatically. This leads to the rapid spread of smoke and the inability to effectively contain the fire, endangering people and property.

[0005] Therefore, in order to ensure that the normal flow of people can enter and exit without affecting the automatic closing of the door in the event of a fire, a composite fire door based on a cloud alarm platform is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a composite fire door based on a cloud alarm platform to solve the problems of normally closed fire doors obstructing normal pedestrian access when automatically closing and failing to close automatically in the event of a fire. By rotating the door handle clockwise to open the door to a certain angle, rotating the handle counterclockwise causes the connecting block to switch positions, thereby affecting the locking mechanism. The locking mechanism then locks the door closer, preventing the rotation of the door closer's hinges and fixing the door angle. When a fire occurs, a motor inside the door body is triggered, causing a reset mechanism to rotate the handle of the unclosed fire door counterclockwise, closing the fire door. To achieve the above objective, this invention provides the following technical solution:

[0007] A composite fire door based on a cloud alarm platform includes a door body, a latch, a latch connecting plate, a door closer, a door handle, a connecting block, a switching mechanism, a locking mechanism, and a reset mechanism. The door handle is rotatably mounted on the door body. A connecting block that cooperates with the door handle is slidably mounted inside the door body. A switching mechanism that cooperates with the connecting block is connected to the door handle. The connecting block includes an initial position and a locked position. When the door handle rotates counterclockwise, it drives the connecting block to switch between the initial and locked positions. The door closer is provided on the door body. A locking mechanism that cooperates with the door closer is connected to the connecting block. When the connecting block is in the initial position, the door closer can move freely, and when the connecting block is in the locked position, the door closer is locked. A reset mechanism that cooperates with the door closer is provided inside the door body, and the door body is closed by the reset mechanism after a fire alarm is triggered.

[0008] In the above scheme, the counterclockwise rotation of the door handle drives the connecting block to switch to the locked position via the switching mechanism. The locking mechanism inside the door then mechanically locks the door closer, restricting the automatic closing of the door. When a fire occurs, the motor receives the fire signal and drives the door handle to rotate counterclockwise, automatically closing the door and preventing the fire from spreading.

[0009] It is known that there are two ways to prevent door closers from closing: stacking heavy objects and using hydraulic rods or cylinders to apply resistance. The advantage of this solution compared to stacking heavy objects is that it does not require manual movement of heavy objects and can automatically close the door in the event of a fire. Compared to using hydraulic rods or cylinders to apply resistance, it does not require the addition of an extra control switch. The door is locked simply by controlling the forward and reverse rotation of the door handle, which is convenient for operation and maintenance and reduces the risk of the door not being able to close due to damage to the circuit or gas line in the event of a fire.

[0010] Preferably, the switching mechanism includes a square shaft, a cam, a limiting rod, a spring, and a partition. A square shaft is fixedly installed inside the door handle, and a cam is fixedly installed on the square shaft. A connecting rod that cooperates with the cam is fixedly installed on the connecting block, and the connecting rod and the connecting block are located below the cam. A partition is provided inside the door body, and the partition is connected to the connecting block via a spring. A limiting rod that limits the position of the connecting block is hinged to the partition, and the limiting rod is slidably connected to the connecting block. A guide groove that cooperates with the limiting rod is provided on the connecting block. The guide groove includes a large V-shaped groove corresponding to the initial position, a small V-shaped groove corresponding to the locked position, and a connecting groove. The upper end of the large V-shaped groove is arc-shaped, and the center of the arc is located below the center of the V-shape. The lower end of the small V-shaped groove is arc-shaped, and the center of the arc is located below the center of the V-shape. The lower side of the small V-shaped groove is longer than the upper side. The large V-shaped groove and the small V-shaped groove are connected by the connecting groove.

[0011] In the above scheme, the design of large V-groove and small V-groove is used to switch the initial position and locked position of the connecting block by simply rotating the door handle counterclockwise, which simplifies the operation. The lower side of the small V-groove is longer than the upper side, so that the distance the connecting block moves when it retracts is longer than the distance it moves forward.

[0012] Preferably, an L-shaped pressure plate is hinged to the connecting block, and the end face of the L-shaped pressure plate is an asymmetrical arc shape. The L-shaped pressure plate and the connecting block are connected by a spring. A fixing plate is fixedly installed on the partition to limit the position of the L-shaped pressure plate, and the fixing plate has a groove for locking the L-shaped pressure plate and a guide groove for guiding the movement direction of the L-shaped pressure plate.

[0013] In the above scheme, the L-shaped pressure plate is pressed down by the fixed plate, allowing the L-shaped pressure plate to move along the guide groove inside the fixed plate. The vertical distance difference of the small V-shape is used to fix the L-shaped pressure plate at the groove of the fixed plate when the connecting block is in the locked position, and the L-shaped pressure plate also retracts from the fixed plate when the connecting block retracts to the initial position. This achieves the distribution of the force on the limit rod when the connecting block is in the locked position, increasing the service life of the limit rod.

[0014] As can be seen, the position switching of the control connecting block can be achieved by rotating the motor. This solution uses the forward and reverse rotation of the door handle to realize the function of unlocking and locking the door body position. The door is locked by the first counterclockwise rotation of the door handle, and the door is unlocked by the second rotation of the door handle. The counterclockwise rotation of the door handle controls the switching of the connecting block position without the need to add an additional switch control, which conforms to people's daily usage habits. After opening the door to a certain angle, the door handle is turned counterclockwise to lock the door position. The operation is simple and convenient, and there is no need to press an additional switch.

[0015] Preferably, the cam is provided with a long shaft for controlling the opening and closing of the latch and a pawl for controlling the movement of the connecting rod, and the connecting rod is provided with a ratchet tooth that cooperates with the pawl.

[0016] It can be seen that the same long shaft can be set on the cam to drive the connecting rod to move. In this solution, a pawl is set on the cam and a ratchet on the connecting rod to cooperate with each other. The advantage is that it reduces the force deviation and reduces the force required to turn the door handle.

[0017] Preferably, the locking mechanism includes a slider, a connecting rod, a ratchet, and a second ratchet tooth. The slider is slidably installed inside the door body, and the connecting rod is fixedly installed on the slider and fixedly connected to the connecting block. The ratchet is fixedly installed at the lower end of the door hinge of the door closer, and the second ratchet tooth is fixedly installed on the slider to restrict the rotation of the ratchet. When the connecting block is in the initial position, the ratchet and the second ratchet tooth are separated, and when the connecting block is in the locked position, the ratchet and the second ratchet tooth are engaged.

[0018] In the above scheme, when the connecting block is in the initial position, the second ratchet is not engaged with the ratchet, and the door hinge of the door closer can rotate freely. When the connecting block is in the locked position, the second ratchet will abut against the ratchet, preventing the rotation of the door hinge of the door closer, thereby locking the position of the door body. The smoothness of the locking angle can be achieved by utilizing the engagement of the ratchet and the second ratchet. The use of mechanical mechanism for limiting can reduce the instability of the equipment caused by damage to the circuit or air circuit.

[0019] Preferably, a counterweight is fixedly installed at the lower end of the connecting rod, and the counterweight is used to make the center of gravity of the connecting rod located near the connecting block. The counterweight is filled with fireproof material, and the counterweight is slidably connected to the inner partition of the door body.

[0020] In the above scheme, the connecting block and the slider are connected by a long connecting rod. The transmission of force can easily cause the connecting rod to bend and break. Adding a counterweight moves the stress point of the connecting rod downward, which alleviates the stress concentration caused by the ratchet abutting against the ratchet wheel rotation.

[0021] Preferably, the reset mechanism includes a motor, a drive gear, a driven gear, and a connecting assembly. A motor for receiving fire alarm signals is fixedly installed inside the door body. A drive gear is installed at the output end of the motor. A driven gear that meshes with the drive gear is rotatably installed on the square shaft. A connecting assembly connects the driven gear and the square shaft. When the drive gear rotates, it drives the driven gear to be fixedly connected to the square shaft through the connecting assembly.

[0022] In the above solution, the door handle is turned counterclockwise by the motor receiving the fire alarm signal, which can close the door in time without manual closing. The motor provides the power source, and the normal operation of the motor will not be affected by circuit damage in the event of a fire.

[0023] Preferably, the connecting assembly includes a turntable and guide beads. The turntable is fixedly mounted on the square shaft, and two symmetrical guide beads are fixedly mounted on the turntable. The driven gear has two symmetrical arc-shaped grooves, and the arc-shaped grooves are used to limit the rotation range of the guide beads.

[0024] In the above solution, an arc-shaped groove is provided inside the passive gear, which ensures that the motor will not be driven to rotate within the normal rotation range of the door handle, thereby ensuring the stability and service life of the motor and allowing the motor to rotate smoothly in the event of a fire, thus achieving the effect of closing the door.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. Existing normally closed fire doors typically only have the function of automatically closing after being opened. Often, because the automatic closing function obstructs the normal flow of people, they are often blocked by heavy objects to keep the door open for a long time. This fire door can achieve the effect of keeping the door open for a long time by turning the door handle counterclockwise and using mechanical limit to restrict the rotation of the door closer's hinges. It does not obstruct the normal flow of people and can automatically close the door in the event of a fire to prevent the spread of fire.

[0027] 2. The door handle controls the switching component. In daily use, turning the door handle clockwise causes the latch to open and close without affecting the normal closing action of the door closer. When it is necessary to fix the door closer, turning the door handle counterclockwise causes the connecting block to switch positions, thereby switching the locked and free states of the door closer. Compared with the remote control of electric door closers, it eliminates the need for circuit control and remote control switch structures, making it convenient for daily use.

[0028] 3. The alarm signal is received by the motor. When the door body is locked, the door is unlocked and closed. The connecting component ensures the smoothness of the door handle during daily use and prevents it from driving the motor, thus increasing the motor's service life. In the event of a fire, the motor drives the connecting component to rotate, thereby causing the door handle to rotate counterclockwise, ensuring the door closes promptly in the event of a fire and achieving the first-time blocking of flames. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the door body of the present invention;

[0031] Figure 3 This is a schematic diagram of the switching mechanism of the present invention;

[0032] Figure 4 This is a partially enlarged structural diagram of the connecting block of the present invention;

[0033] Figure 5 This is a partially enlarged structural diagram of the L-shaped pressure plate and fixing plate of the present invention;

[0034] Figure 6 For the present invention Figure 5 AA section view;

[0035] Figure 7 This is a schematic diagram of the locking mechanism structure of the present invention;

[0036] Figure 8 This is a schematic diagram of the reset mechanism structure of the present invention;

[0037] Figure 9 For the present invention Figure 8 BB cross-sectional view.

[0038] In the diagram: 1. Door body; 2. Lock tongue; 3. Lock tongue connecting plate; 4. Door closer; 5. Door handle; 6. Connecting block; 7. Switching mechanism; 8. Locking mechanism; 9. Reset mechanism; 61. Large V-groove; 62. Small V-groove; 63. Connecting groove; 71. Square shaft; 72. Cam; 73. Connecting rod; 74. Limiting rod; 75. Spring 1; 76. Partition plate; 77. Long shaft; 78. Pawl; 79. Ratchet 1; 81. Slider; 82. Connecting rod; 83. Ratchet; 84. Ratchet 2; 85. Counterweight; 91. Motor; 92. Drive gear; 93. Driven gear; 94. Connecting assembly; 710. L-shaped pressure plate; 711. Spring 2; 712. Fixing plate; 931. Arc groove; 941. Turntable; 942. Guide ball; 7121. Groove; 7122. Guide groove. Detailed Implementation

[0039] 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.

[0040] Please see Figures 1 to 9 The present invention provides a case name and the technical solution is as follows:

[0041] A composite fire door based on a cloud alarm platform includes a door body 1, a latch 2, a latch connecting plate 3, a door closer 4, a door handle 5, a connecting block 6, a switching mechanism 7, a locking mechanism 8, and a reset mechanism 9. The switching mechanism 7 includes a square shaft 71, a cam 72, a connecting rod 73, a limit rod 74, a first spring 75, a partition 76, a short shaft, a pawl 78, a first ratchet 79, an L-shaped pressure plate 710, a second spring 711, a fixing plate 712, a groove 7121, a guide groove 7122, a large V-shaped groove 61, a small V-shaped groove 62, and a connecting groove 63. The locking mechanism 8 includes a slider 81, a connecting rod 82, a ratchet 83, a second ratchet 84, and a counterweight 85. The reset mechanism 9 includes a motor 91, a driving gear 92, a driven gear 93, an arc-shaped groove 931, and a connecting assembly 94. The connecting assembly 94 includes a turntable 941 and a guide bead 942.

[0042] As one embodiment of the present invention, refer to Figures 1 to 7 A door handle 5 is rotatably mounted on the door body 1. A square shaft 71 is fixedly mounted inside the door handle 5. A cam 72 is fixedly mounted on the square shaft 71. The cam 72 is provided with a long shaft 77 and a pawl 78. When the door handle 5 rotates clockwise, the square shaft 71 drives the cam 72 to rotate clockwise. At this time, the long shaft 77 of the cam 72 drives the upper baffle of the latch connecting plate 3 to move backward, thereby controlling the opening and closing of the latch 2. A connecting block 6 is slidably mounted inside the door body 1. A connecting rod 73 is fixedly mounted on the connecting block 6. The cam 72 is equipped with a ratchet 79, which engages with the pawl 78 on the cam 72. The pawl 78 on the cam 72 reduces the force deviation transmitted when the door handle 5 rotates counterclockwise, thus reducing the force required for the door handle 5 to rotate counterclockwise. When the door handle 5 rotates counterclockwise, the square shaft 71 drives the cam 72 to rotate counterclockwise. At this time, the pawl 78 on the cam 72 will engage with the ratchet 79 on the connecting rod 73, pushing the ratchet 79 to move to the right. The distance the connecting rod 73 moves to the right can be controlled by setting the shape and curvature of the pawl 78.

[0043] A partition 76 is provided inside the door body 1. A circular boss is provided on the partition 76. A circular hole is opened at the right end of the connecting block 6. A spring 75 is placed on the circular boss and located in the circular hole of the connecting block 6. A limiting rod 74 is hinged to the partition 76 to limit the position of the connecting block 6, and the limiting rod 74 is slidably connected to the connecting block 6. A guide groove is provided on the connecting block 6. The guide groove includes a large V-shaped groove 61 corresponding to the initial position, a small V-shaped groove 62 corresponding to the locked position, and a connecting groove 63. The upper end of the large V-shaped groove 61 is arc-shaped, and the center of the arc is located below the center of the V-shape. The lower end of the small V-shaped groove 62 is arc-shaped, and the center of the arc is located below the center of the V-shape. The lower side of the small V-shaped groove 62 is longer than the upper side, that is, when the connecting block 6 returns to the initial position... When the door handle 5 is turned counterclockwise for the first time, the limiting rod 74 is in the large V-groove 61. The connecting block 6 moves to the right a certain distance and then to the left. At this time, the spring 75 is in a compressed state. The limiting rod 74 will be stuck in the small V-groove 62 of the connecting block 6 via the connecting groove 63 above the connecting block 6. When the door handle 5 is turned counterclockwise for the second time, the connecting block 6 will move to the right a certain distance and then to the left to the initial position. At this time, the spring 75 is released from the compressed state. The limiting rod 74 in the small V-groove 62 will move forward a certain distance because the lower side of the small V-groove 62 is longer than the upper side. Then the connecting block 6 will move back to the large V-groove 61 via the connecting groove 63 below the connecting block 6. At this time, the door handle 5 is reset.

[0044] The partition 76 is installed inside the door body 1 to separate the mechanisms installed inside the door body 1 from the fireproof materials filled inside the door body 1. The partition 76 serves as the basis for installing the various mechanisms inside the door body 1, ensuring the stable operation of each mechanism and isolating the fireproof materials from interference. The partition 76 is made of high-temperature resistant and high-strength steel such as stainless steel.

[0045] An L-shaped pressure plate 710 is hinged to the connecting block 6, and a second spring 711 is installed between the L-shaped pressure plate 710 and the connecting block 6. A fixing plate 712 is fixedly installed on the partition plate 76. The fixing plate 712 has a guide groove 7122 and a recess 7121. When the door handle 5 is turned counterclockwise for the first time, the connecting block 6 drives the L-shaped pressure plate 710 to move to the right. The L-shaped pressure plate 710 is pressed down by the fixing plate 712 and moves along the guide groove 7122 of the fixing plate 712. At this time, the second spring 711 stores energy. When the L-shaped pressure plate 710 moves to the position of the recess 7121, the second spring 711 releases and lifts the L-shaped pressure plate 710. The L-shaped pressure plate 710 then moves a certain distance to the right and returns to its original position. When the door handle 5 is rotated counterclockwise for the second time, the connecting block 6 drives the L-shaped pressure plate 710 to move to the right a certain distance. At this time, the distance to the right will be longer than the distance of the first retraction. After the L-shaped pressure plate 710 touches the wall of the groove 7121 and is pressed down, it moves out of the groove 7121 and then passes through the guide groove 7122. At this time, the connecting block 6 will drive the L-shaped pressure plate 710 to move to the left. The L-shaped pressure plate 710 will retract through the inner wall of the guide groove 7122 and exit the guide groove 7122 until it exits the fixing plate 712. When the L-shaped pressure plate 710 is stuck in the groove 7121, it can help the limit rod 74 to share the force of retraction when the connecting block 6 is in the locked position, thereby improving the service life of the limit rod 74.

[0046] A slider 81 is slidably mounted on the upper part of the door body 1. A connecting rod 82 is fixedly mounted on the slider 81 and is fixedly connected to the connecting block 6. When the connecting block 6 moves, it will drive the slider 81 to move. A ratchet 83 is fixedly mounted on the lower end of the door hinge of the door closer 4. A ratchet tooth 84 is fixedly mounted on the slider 81 to restrict the rotation of the ratchet 83. By controlling the movement of the connecting block 6, the slider 81 moves. When the connecting block 6 moves from the initial position to the locked position, the slider 81 will move in sync with the connecting block 6. However, at this time, the connecting rod 82 is subjected to greater stress concentration. A boss is provided at the lower end of the connecting rod 82, near the connecting block 6. A counterweight 85 is rotatably mounted on the boss. The lower end of the counterweight 85 is placed on the partition 76. The partition 76 has a groove that cooperates with the counterweight 85 to support the counterweight 85 and reduce the force required to push the connecting block 6, that is, to reduce the force required to turn the door handle 5 counterclockwise. The force required is to shift the center of gravity of the connecting rod 82 downward, reducing the stress concentration of the slider 81 and improving the service life of the connecting rod 82. When the connecting block 6 is in the initial position, the slider 81 is away from the door shaft of the door closer 4. At this time, the second ratchet 84 does not engage with the ratchet 83. When the connecting block 6 moves from the initial position to the locked position, the slider 81 drives the second ratchet 84 to move closer to the ratchet 83 on the door shaft of the door closer 4. After the second ratchet 84 engages with the ratchet 83, the slider 81 will continue to move to the right with the second ratchet 84. After the second ratchet 84 rotates with the ratchet 83 at a certain angle, the second ratchet 84 will retract a small distance and stop. At this time, the connecting block 6 is in the locked position. After the ratchet 83 rotates at a certain angle, it will not be able to continue to rotate due to the second ratchet 84, thus achieving the effect of limiting the position of the door body 1. The mechanical limiting method can save the extra power source to apply resistance to block the rotation of the door shaft of the door closer 4 or the force of the door closer 4 to rotate the door.

[0047] As one embodiment of the present invention, refer to Figures 8 to 9The door body 1 is equipped with a motor 91 that receives fire alarm signals from a smoke detector. A drive gear 92 is mounted on the output end of the motor 91. A driven gear 93, meshing with the drive gear 92, is rotatably mounted on a square shaft 71. The driven gear 93 has a circular hole the size of the outer circle of the square shaft 71. When the square shaft 71 rotates, the driven gear 93 does not rotate with it. A bushing is rotatably mounted on the square shaft 71, installed between the door handle 5 and the driven gear 93, to fix the position of the driven gear 93 and prevent it from shifting during rotation. A turntable 941 is fixedly mounted on the square shaft 71, and two symmetrical guide beads 942 are fixedly mounted on the turntable 941. The driven gear 93 is slidably connected, and the driven gear 93 has two symmetrical arc-shaped grooves 931. When the door handle 5 rotates, it drives the guide bead 942 on the turntable 941 to rotate in the arc-shaped groove 931. During the rotation of the door handle 5, the guide bead 942 will not touch the inner walls on both sides of the arc-shaped groove 931. That is, when the door handle 5 rotates, it will not drive the motor 91 to rotate, thereby increasing the stability and service life of the motor 91. When a fire occurs, the motor 91 drives the driving gear 92 to rotate, and the driving gear 92 drives the driven gear 93 to rotate. When the driven gear 93 rotates to a certain angle, the inner wall of the arc-shaped groove 931 contacts the guide bead 942 and drives the turntable 941 to rotate. At this time, the door handle 5 rotates counterclockwise, releasing the lock of the door closer 4 and closing the door body 1.

[0048] 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 composite fire door based on a cloud alarm platform, comprising a door body, a lock tongue, a lock tongue connecting plate, a door closer, characterized in that: The door body is provided with a door closer, the connecting block is connected with the door closer, the door closer is freely movable when the connecting block is in the initial position, and the door closer is locked when the connecting block is in the locked position, the door body is provided with a reset mechanism which is matched with the door closer, and the door body is closed through the reset mechanism after the fire alarm is triggered; the reset mechanism comprises a motor, a driving gear, a driven gear and a connecting assembly, the motor which receives the fire alarm signal is fixedly installed in the door body, the output end of the motor is provided with the driving gear, the driven gear which is matched with the driving gear is rotatably installed on the square shaft, and the connecting assembly is connected between the driven gear and the square shaft; the driving gear drives the driven gear to be fixedly connected with the square shaft through the connecting assembly when the driving gear rotates.

2. The composite fire door based on the cloud alarm platform according to claim 1, characterized in that: The switch mechanism comprises a square shaft, a cam, a connecting rod, a limiting rod, a spring and a partition plate, the square shaft is fixedly installed in the door handle, the cam is fixedly installed on the square shaft, the connecting rod which is matched with the cam is fixedly installed on the connecting block, the connecting rod and the connecting block are located on the lower side of the cam, the partition plate is arranged in the door body and connected with the connecting block through the spring, the limiting rod which limits the position of the connecting block is hinged on the partition plate and slidably connected with the connecting block, the guiding groove which is matched with the limiting rod is formed in the connecting block, the guiding groove comprises a large V-shaped groove corresponding to the initial position, a small V-shaped groove corresponding to the locked position and a connecting groove, the upper end of the large V-shaped groove is arc-shaped, and the center of the arc-shaped is located below the center of the V-shaped groove, the lower end of the small V-shaped groove is arc-shaped, and the center of the arc-shaped is located below the center of the V-shaped groove, the lower side of the small V-shaped groove is longer than the upper side, and the large V-shaped groove and the small V-shaped groove are connected through the connecting groove.

3. The composite fire door based on the cloud alarm platform according to claim 2, characterized in that: The cam is provided with a long shaft which controls the opening and closing of the lock tongue and a pawl which controls the movement of the connecting rod, and the connecting rod is provided with a ratchet which is matched with the pawl.

4. The composite fire door based on the cloud alarm platform according to claim 1 or 2, characterized in that: The locking mechanism comprises a sliding block, a connecting rod, a ratchet wheel and a ratchet, the sliding block is slidably installed in the door body, the connecting rod is fixedly installed on the sliding block and fixedly connected with the connecting block, the ratchet wheel is fixedly installed on the lower end of the door shaft of the door closer, the ratchet which limits the rotation of the ratchet wheel is fixedly installed on the sliding block, the ratchet wheel is separated from the ratchet when the connecting block is in the initial position, and the ratchet wheel is engaged with the ratchet when the connecting block is in the locked position.

5. The composite fire door based on the cloud alarm platform according to claim 4, characterized in that: The lower end of the connecting rod is fixedly provided with a counterweight, the counterweight is used for locating the gravity center of the connecting rod near the connecting block, the counterweight is filled with fireproof material, and the counterweight is slidably connected with the inner partition plate of the door body.

6. The composite fire door based on the cloud alarm platform according to claim 4, characterized in that: The L-shaped pressing plate is hingedly connected to the connecting block, the end face of the L-shaped pressing plate is an arc asymmetric to both sides, the L-shaped pressing plate is connected with the connecting block through the second spring, the fixed plate for limiting the position of the L-shaped pressing plate is fixedly installed on the partition plate, the recess for clamping the L-shaped pressing plate is formed in the fixed plate, and the guide groove for guiding the L-shaped pressing plate to move out of the recess is formed in the fixed plate.

Images