A locking device for a fire door of a subway interval communication passage

Abstract

This application discloses a locking device for fire doors in subway connecting passages, including a door leaf and a locking device. The door leaf is located within a door frame and has a limiting member. The locking device is installed on the side of the door frame near the door leaf opening and is used to lock the door leaf when it is closed. The locking device includes a ball socket, a connecting rod assembly, and a hand lever. The ball socket can be fixedly connected to the door frame or door jamb. One end of the connecting rod assembly is rotatably connected to the ball socket, and the other end is connected to the hand lever, which can drive the connecting rod assembly to rotate. When the door leaf is closed, the connecting rod assembly engages with the limiting member, forming a locked state that prevents the door leaf from opening. When the connecting rod assembly disengages from the limiting member, the door leaf is in an openable state. Compared with the traditional telescopic latch structure, as long as the connecting rod assembly does not disengage from the limiting member, the closed door leaf cannot be opened outward regardless of the lateral wind pressure or vibration, thus improving the fire door's wind pressure resistance in extreme environments.

Description

Technical Field

[0001] This application relates to the technical field of fireproof doors for subway inter-connecting passages, specifically a locking device for fireproof doors in subway inter-connecting passages. Background Technology

[0002] The subway section connecting passage is an emergency escape passage connecting two tunnels. It has been subjected to the huge "piston wind pressure" (alternating positive and negative pressure, with pressure values ​​reaching thousands of Pascals) generated by the high-speed passing of trains for a long time.

[0003] Fire door systems are crucial safety facilities in subway tunnel connections, primarily functioning to ensure safe evacuation during emergencies and prevent the spread of fire. Current fire door systems have the following shortcomings: Firstly, most existing fire doors use traditional hinges for connection, which are "point-loaded" structures. Under long-term high-frequency wind pressure vibration, the hinges are prone to deformation and the screws to loosen, leading to door sealing failure or even detachment.

[0004] Secondly, in order to resist wind pressure and prevent the door from being blown open, the traditional approach is to add multiple chains, bolts, or horizontal bars. In the event of a fire or emergency evacuation, panicked people need to remove these reinforcement facilities one by one, which is cumbersome and time-consuming, seriously delaying the golden time for escape, posing a significant safety hazard, making it difficult for people to escape quickly, and resulting in low escape efficiency.

[0005] Thirdly, the existing door lock handles have extremely high friction under wind pressure, making them difficult to turn and operate. They also lack intuitive status indicators, making it difficult for inspectors to quickly determine whether the door is locked.

[0006] Fourthly, the civil structure of the tunnel is prone to slight settlement, which can cause the door frame to deform. Once the door frame is deformed, traditional bolt-type locks are very likely to get stuck and cannot be pulled out, making it impossible to open the fire door. Summary of the Invention

[0007] One objective of this application is to provide a locking device for fire doors in subway tunnel connecting passages that can overcome at least one of the deficiencies in the aforementioned background art.

[0008] To achieve the above objectives, this application provides the following technical solution: a locking device for fireproof doors in subway connecting passages, comprising: The door leaf, located within the door frame, is equipped with a limiting device; A locking device is installed on the side of the door frame near the door opening to lock the door when it is closed. The locking device includes a ball socket, a connecting rod assembly, and a hand lever. The ball socket can be fixedly connected to the door frame or door jamb. One end of the connecting rod assembly is rotatably connected to the ball socket, and the other end is connected to the hand lever. The hand lever can drive the connecting rod assembly to rotate. When the door is closed, the linkage assembly engages with the limiting member, forming a locked state that prevents the door from opening; When the linkage assembly disengages from the limiting member, the door is in an openable state.

[0009] Compared to existing technologies, by incorporating a locking device and limiting components, when an escapee passes through, the locking device and limiting components can be unlocked with a simple turn and pull, and the door can be opened by pushing, achieving rapid unlocking and avoiding the cumbersome operation of multiple pins or knobs required in traditional structures. The structure employing a linkage assembly that engages with the limiting component ensures that, compared to traditional telescopic latch structures, the door cannot open outwards as long as the linkage assembly remains within the limiting component, regardless of the magnitude of lateral wind pressure or vibration, guaranteeing absolute reliability of locking in tunnel environments with drastic wind pressure fluctuations. Simultaneously, the ball joint can withstand the enormous lateral shear force transmitted from the door through the limiting component and evenly distribute it across the door frame, preventing traditional hinges or locking points from jamming or deforming under extreme wind pressure, ensuring that the door can still be opened smoothly in emergencies.

[0010] Preferably, there are at least three linkage assemblies, which are respectively connected to the middle and both ends of the hand lever; There are at least three ball sockets, and they are provided for corresponding link assemblies; The number of limiting components is equal to the number of ball sockets.

[0011] In this embodiment, by setting at least three linkage components, ball sockets, and limiting components, the stability and reliability of the locking device can be enhanced, and the wind pressure resistance of the fire door in extreme environments can be improved.

[0012] Preferably, the linkage assembly includes a connector and a transmission component, the transmission component can be engaged with a limiting component, and one end of the connector is fixedly connected to the pull rod; One end of the transmission component is rotatably connected to the other end of the connecting component, and the other end is rotatably connected to the ball socket. Both ends of the transmission component are provided with ball heads.

[0013] In this embodiment, the fit between the ball head and the socket is highly precise, ensuring that the linkage assembly maintains a stable connection even under significant lateral shear forces. The connection structure between the ball head and the socket has inherent omnidirectional adjustment capability, allowing for certain installation errors or settlement deformations between the door frame and the door leaf, preventing the lock from jamming due to structural deformation.

[0014] Preferably, the ball socket has a cavity for mounting the ball head, and the surface of the ball socket has a guide groove that communicates with the cavity and is used to fix the transmission component. The surface of the guide groove is provided with an opening, and the guide groove has an L-shaped structure.

[0015] In this embodiment, by setting a guide groove with an opening on its surface, the linkage assembly can operate smoothly during rotation, thereby realizing the locking and unlocking of the door leaf. At the same time, it guides the transmission component and provides stable support for the transmission component in the locked and released states, ensuring that the transmission component can operate normally under various environmental conditions.

[0016] Preferably, the guide groove includes a locking section and a releasing section; the transmission member is at least partially engaged at the locking section and at least partially engaged at the limiting member, so that the closed door is in a locked state; The transmission element is at least partially engaged at the release section so that the door is in an openable state; The length of the locking section is greater than the length of the releasing section.

[0017] In this embodiment, the design of the locking and releasing sections enables the transmission components to achieve precise engagement at different positions, improving the ease of operation and effectively avoiding safety hazards caused by misoperation.

[0018] Preferably, the end of the connector is provided with a fixing part, the fixing part has a cavity inside for placing the ball head, and the surface of the fixing part is also provided with a guide groove.

[0019] In this embodiment, by also providing a guide groove on the surface of the fixed part, the hand lever can rotate and pull the transmission component to rotate together during the rotation process, thereby realizing the engagement or disengagement between the transmission component and the limiting component. This design makes it easier and more convenient for users to operate, and the structure is simple, without the need for additional structures to cooperate, thus saving costs.

[0020] Preferably, the limiting member has an L-shaped structure.

[0021] In this embodiment, the limiting member is used to lock the transmission member in one direction and to limit and support the transmission member in the other direction, so as to prevent the transmission member from shaking due to wind pressure during the locking process and enhance the stability and stability of the locking device.

[0022] Preferably, it also includes a hinge mechanism installed on the side of the door leaf away from the ball socket; The hinge mechanism includes a connecting rod and at least two fixing members, with both ends of the connecting rod rotatably connected to the two fixing members respectively; The side of the connecting rod is fixedly connected to the door hinge side edge of the door leaf, and the connecting rod serves as the rotation axis of the door leaf.

[0023] In this embodiment, by setting connecting rods and fasteners, the door leaf has extremely high wind pressure resistance stability, changing the wind pressure load from "point transmission" to "full-axis transmission", which greatly improves the structure's shear and bending resistance. The connecting rods combine the door leaf and the pivot into one unit, and the load is evenly distributed along the height of the door leaf, completely solving the problems of hinge damage and stress concentration.

[0024] Preferably, one of the fasteners is embedded in the side wall of the door frame, and the other fastener is embedded in the ground; The fixing component is a bearing seat or a bushing.

[0025] In this embodiment, by setting the fixing component as a bearing seat or bushing, most of the vertical load of the door leaf can be directly transferred to the building structure floor, greatly reducing the stress on the side wall of the door frame. This is especially suitable for situations where the connection strength between the door frame and the wall is limited, thus improving the stability of the door leaf. When it is necessary to open the door leaf, only a light force needs to be applied to easily and smoothly rotate and open the door leaf, ensuring reliable sealing while enabling quick and easy opening in emergency situations.

[0026] Preferably, the door leaf is provided with a door handle.

[0027] In this embodiment, the door handle makes it easier for users to open the door, making the opening and closing of the door more convenient. Attached Figure Description

[0028] Figure 1 A schematic diagram of the structure of a locking device for a fireproof door in a subway connecting passage provided in an embodiment of this application. Figure 1 ; Figure 2 for Figure 1 A magnified schematic diagram of the structure of part A in the diagram; Figure 3 A schematic diagram of the structure of a locking device for a fireproof door in a subway connecting passage provided in an embodiment of this application. Figure 2 ; Figure 4 for Figure 3 A magnified schematic diagram of the partial structure of B in the diagram; Figure 5 A schematic diagram of the structure of a locking device for a fireproof door in a subway connecting passage provided in an embodiment of this application. Figure 3 ; Figure 6 for Figure 5 A magnified schematic diagram of the structure of C in the middle; Figure 7 An elevation view of a locking device for a fireproof door in a subway tunnel connecting passage, provided as an embodiment of this application; Figure 8 A partial schematic diagram of a locking device for a fireproof door in a subway tunnel connecting passage provided in an embodiment of this application. Figure 1 ; Figure 9 for Figure 8 Schematic diagram of the DD cross-sectional structure in the middle; Figure 10 A partial schematic diagram of a locking device for a fireproof door in a subway tunnel connecting passage provided in an embodiment of this application. Figure 2 ; Figure 11 for Figure 10 A schematic diagram of the EE cross-sectional structure.

[0029] In the diagram: 1. Door leaf; 2. Door frame; 3. Locking device; 4. Hinge mechanism; 11. Limiting component; 12. Door handle; 31. Ball socket; 32. Linkage assembly; 33. Hand lever; 41. Connecting rod; 42. Fixing component; 311. Cavity; 312. Guide groove; 321. Connector; 322. Transmission component; 323. Ball head; 3121. Opening; 3122. Locking section; 3123. Release section; 3211. Fixing part. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0033] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 11 illustrate.

[0034] This embodiment provides a locking device for fireproof doors in subway connecting passages, such as... Figures 1 to 11 As shown, the device includes a door leaf 1 and a locking device 3. The door leaf 1 is located inside the door frame 2 and has a door handle 12. The door handle 12 facilitates the opening and closing of the door leaf 1, making the opening and closing of the door leaf 1 more convenient for users. The locking device 3 is installed on the side of the door frame 2 near the opening 3121 of the door leaf 1. The locking device 3 is used to lock the door leaf 1 when it is closed. The locking device 3 includes a ball socket 31, a connecting rod assembly 32, and a pull rod 33. The ball socket 31 can be fixedly connected to the door frame 2 or the door jamb. The ball socket 31 is a hemispherical shell. The ball socket 31 can withstand the huge lateral shear force transmitted from the door leaf 1 through the limiting member 11 and distribute it evenly to the door frame 2, avoiding the jamming or deformation of traditional hinges or locking points under extreme wind pressure, and ensuring that the door leaf 1 can still be opened smoothly in an emergency. The pull rod 33 is made of lightweight material and is relatively light in weight. One end of the connecting rod assembly 32 is rotatably connected to the ball socket 31, and the other end of the connecting rod assembly 32 is connected to the pull rod 33. The pull rod 33 can drive the connecting rod assembly 32 to rotate. The rotation angle of the pull rod 33 is 90°, thereby realizing the locking or unlocking action. That is to say, the pull rod 33 can rotate 90° clockwise in a direction parallel to the plane of the door leaf 1. The door leaf 1 is provided with a limiting member 11, which is a door leaf limiter. The limiting member 11 is used to engage with the connecting rod assembly 32 when the door leaf 1 is closed to keep the door leaf 1 in a locked state. When an escapee passes through, only a push action is needed to unlock the locking device 3 and the limiting member 11. Then, the door leaf 1 can be opened by pushing again, realizing quick unlocking and avoiding the cumbersome operation of multiple pins or knobs required in traditional structures.

[0035] like Figure 1 , Figure 2 As shown, when the door 1 is closed, the linkage assembly 32 engages with the limiting member 11, forming a locked state that prevents the door 1 from opening; when the linkage assembly 32 disengages from the limiting member 11, the door 1 is in an openable state. Compared with the traditional telescopic tongue structure, this application ensures that as long as the linkage assembly 32 does not disengage from the limiting member 11, the door 1 in the closed state cannot be opened outward regardless of the lateral wind pressure or vibration, thus ensuring the absolute reliability of locking in the tunnel environment with drastic wind pressure fluctuations.

[0036] Among them, the limiting member 11 has an L-shaped structure, and the opening 3121 of the limiting member 11 is set in the direction away from the ground. The limiting member 11 is used to lock the transmission member 322 on one side, and the other side of the limiting member 11 is used to limit and support the transmission member 322, so as to prevent the transmission member 322 from shaking due to wind pressure during the locking process, thereby enhancing the stability and stability of the locking device 3.

[0037] Specifically, there are at least three linkage assemblies 32, each connected to the middle and both ends of the pull rod 33. One linkage assembly 32 is connected to the middle of the pull rod 33, and the other two linkage assemblies 32 are connected to the two ends of the pull rod 33. There are at least three ball socket seats 31, corresponding to the linkage assemblies 32. The number of limiting members 11 is equal to the number of ball socket seats 31. By setting at least three linkage assemblies 32, ball socket seats 31, and limiting members 11, the three work together to enhance the stability and reliability of the locking device 3, and improve the fire door's wind pressure resistance in extreme environments. Furthermore, the three components have a simple structure, are easy to mold during production, facilitate later maintenance and replacement, and reduce usage costs.

[0038] Furthermore, such as Figure 2 , Figure 4 , Figure 6 , Figure 9 , Figure 11 As shown, the linkage assembly 32 includes a connector 321 and a transmission component 322. The transmission component 322 can engage with the limiting component 11 to lock the door leaf 1 in the closed state. One end of the connector 321 is fixedly connected to the handle 33; one end of the transmission component 322 is rotatably connected to the other end of the connector 321, and the other end of the transmission component 322 is rotatably connected to the ball socket 31. That is, when the user pulls the handle 33 upwards, the transmission component 322 disengages from the limiting component 11, and the handle 33 can drive the connector 321 of the transmission component 322 to rotate, causing the transmission component 322 to rotate around the ball socket 31. The rotation of the transmission component 322 can engage or disengage with the limiting component 11, thereby completing the locking or unlocking operation of the door leaf 1. Both ends of the transmission component 322 are provided with ball heads 323. By setting the ball heads 323, the transmission component 322 is more flexible during rotation, avoiding jamming caused by angle limitation. Meanwhile, the fit between the ball head 323 and the ball socket 31 is highly precise, ensuring that the connecting rod assembly 32 can maintain a stable connection even when subjected to large lateral shear forces. The connection structure between the ball head 323 and the ball socket 31 has a natural omnidirectional adjustment capability, allowing for certain installation errors or settlement deformations between the door frame 2 and the door leaf 1, without causing the lock to jam due to civil engineering deformation.

[0039] The ball socket 31 has a cavity 311 for mounting the ball head 323, the size of which is adapted to the size of the ball head 323. The surface of the ball socket 31 has a guide groove 312, which is L-shaped and communicates with the cavity 311. The guide groove 312 is used to fix the transmission component 322, meaning the transmission component 322 at least partially passes through the guide groove 312 and extends to the outside of the ball socket 31 to connect with the connector 321. The surface of the guide groove 312 has an opening 3121, which facilitates the smooth operation of the linkage assembly 32 during rotation, thereby enabling the locking and unlocking of the door leaf 1. It also guides the transmission component 322, providing stable support for the transmission component 322 in both locked and released states, ensuring its normal operation under various environmental conditions. In the locked state, the solid sidewall of the ball socket 31 directly and physically blocks the wind pressure thrust of the transmission component 322. The greater the wind pressure, the tighter the lock. It can resist high-intensity piston wind without any additional chains or pins.

[0040] Among them, such as Figure 6 , Figure 9 , Figure 11 As shown, the guide slide 312 includes a locking section 3122 and a releasing section 3123. The transmission member 322 is at least partially engaged in the locking section 3122 and at least partially engaged in the limiting member 11, so that the closed door leaf 1 is in a locked state. The transmission member 322 is at least partially engaged in the releasing section 3123, so that the door leaf 1 is in an openable state. The groove length of the locking section 3122 is greater than the groove length of the releasing section 3123. Through the design of the locking section 3122 and the releasing section 3123, the transmission member 322 can achieve precise engagement in different positions, improving the convenience of operation and effectively avoiding safety hazards caused by misoperation. That is, when the transmission member 322 is partially engaged in the locking section 3122, the closed door leaf 1 is in a stable locked state, ensuring that it will not be accidentally opened under extreme wind pressure conditions; while when the transmission member 322 rotates to the releasing section 3123, the door leaf 1 can be opened freely, facilitating quick passage for personnel.

[0041] The end of the connector 321 is provided with a fixing part 3211. The fixing part 3211 has a cavity 311 for placing the ball head 323 inside. The surface of the fixing part 3211 is also provided with a guide groove 312. The guide groove 312 is used to fix the ball head 323 at the other end of the transmission member 322, that is, the ball head 323 near the end of the connector 321. This allows the hand lever 33 to pull the transmission member 322 to rotate together during rotation, thereby realizing the engagement or disengagement between the transmission member 322 and the limiting member 11. This design makes it easier and more convenient for users to operate. At the same time, the structure is simple and does not require additional structures to cooperate, saving costs.

[0042] When door leaf 1 is in the locked state (i.e., the wind-pressure resistant state), the hand lever 33 is fixed by the limiting member 11, and the transmission member 322 is located at the end of the locking section 3122 of the L-shaped guide groove 312. When the train piston wind pressure acts on door leaf 1, and door leaf 1 has a tendency to open outward, the transmission member 322 will be subjected to radial thrust. This thrust acts directly on the solid limiting wall of the ball socket 31, which is the edge of the locking section 3122 of the L-shaped guide groove 312. Due to the physical obstruction of the solid wall, the transmission member 322 cannot enter the opening path, thus relying on the strength of the structure itself to firmly lock door leaf 1.

[0043] The operator holds the handle and rotates it 90° clockwise in a direction parallel to the plane of the door leaf 1. During the rotation, the handle drives the transmission component 322 to slide along the locking section 3122 within the ball socket 31 until it reaches the corner of the L-shaped guide groove 312, which is the intersection of the locking section 3122 and the release section 3123, thus releasing the horizontal limit.

[0044] The operator pulls the lever 33 in a direction perpendicular to the plane of door leaf 1 (i.e., outward). At this time, the transmission component 322 is aligned with the release section 3123 of the L-shaped guide groove 312 (opening 3121 facing outward), and is no longer obstructed by the solid wall. It then slides out of the ball socket 31 along the release section 3123, and the tension between the door frame 2 and door leaf 1 is released. Door leaf 1 can then rotate around the left-hand continuous pivot to open, thus releasing the vertical constraint and opening door leaf 1. The complex unlocking process is simplified into two consecutive ergonomic actions: horizontal rotation of 90° (unlocking) and outward pulling (opening the door). No additional tools or complex operations are required, and the process can be completed in seconds. The simple structure significantly improves emergency evacuation efficiency.

[0045] Furthermore, as shown in Figure 7, it also includes a hinge mechanism 4, installed on the side of the door leaf 1 away from the ball socket 31; the hinge mechanism 4 includes a connecting rod 41 and at least two fixing members 42, the connecting rod 41 is a metal round tube, and the two ends of the connecting rod 41 are rotatably connected to the two fixing members 42 respectively; the side of the connecting rod 41 is fixedly connected to the door hinge side edge of the door leaf 1, and the connecting rod 41 serves as the rotation axis of the door leaf 1. By setting the connecting rod 41 and the fixing members 42, the door leaf 1 has extremely high wind pressure resistance stability, transforming the wind pressure load from "point transmission" to "full axis transmission", greatly improving the structure's shear and bending resistance, combining the door leaf 1 with the rotation axis into one unit, and the load is evenly distributed along the height direction of the door leaf 1, completely solving the problems of hinge damage and stress concentration.

[0046] One fastener 42 is embedded in the side wall of the door frame 2, and the other fastener 42 is embedded in the ground; the fastener 42 is a bearing seat or bushing. By setting the fastener 42 as a bearing seat or bushing, most of the vertical load of the door leaf 1 can be directly transferred to the building structure ground, greatly reducing the stress on the side wall of the door frame 2. This is especially suitable for situations where the connection strength between the door frame 2 and the wall is limited, thus improving the stability of the door leaf 1. When it is necessary to open the door leaf 1, only a light force needs to be applied to easily and smoothly rotate and open the door leaf 1, ensuring reliable sealing while enabling quick and easy opening in emergencies.

[0047] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A locking device for fireproof doors in subway connecting passages, characterized in that, include: The door leaf (1) is located inside the door frame (2) and is equipped with a limiting member (11). A locking device (3) is installed on the side of the door frame (2) near the opening (3121) of the door leaf (1) to lock the door leaf (1) when it is closed; The locking device (3) includes a ball socket (31), a connecting rod assembly (32), and a hand lever (33). The ball socket (31) can be fixedly connected to the door frame (2) or the door jamb. One end of the connecting rod assembly (32) is rotatably connected to the ball socket (31), and the other end is connected to the hand lever (33). The hand lever (33) can drive the connecting rod assembly (32) to rotate. When the door (1) is closed, the linkage assembly (32) engages with the limiting member (11) to form a locked state that prevents the door (1) from opening; When the linkage assembly (32) disengages from the limiting member (11), the door leaf (1) is in an openable state.

2. The locking device for fireproof doors in subway connecting passages according to claim 1, characterized in that, There are at least three linkage assemblies (32), which are respectively connected to the middle and both ends of the hand lever (33); There are at least three ball sockets (31), and they are provided corresponding to the connecting rod assembly (32); The number of limiting members (11) is equal to the number of ball sockets (31).

3. The locking device for fireproof doors in subway connecting passages according to claim 1, characterized in that, The linkage assembly (32) includes a connector (321) and a transmission component (322). The transmission component (322) can be engaged with the limiting component (11), and one end of the connector (321) is fixedly connected to the hand lever (33). One end of the transmission component (322) is rotatably connected to the other end of the connector (321), and the other end is rotatably connected to the ball socket (31); Both ends of the transmission component (322) are provided with ball heads (323).

4. The locking device for fireproof doors in subway connecting passages according to claim 3, characterized in that, The ball socket (31) has a cavity (311) for installing the ball head (323), and the surface of the ball socket (31) has a guide groove (312). The guide groove (312) communicates with the cavity (311) and is used to fix the transmission component (322). The surface of the guide groove (312) is provided with an opening (3121), and the guide groove (312) has an L-shaped structure.

5. The locking device for fireproof doors in subway connecting passages according to claim 4, characterized in that, The guide slide (312) includes a locking section (3122) and a releasing section (3123); the transmission member (322) is at least partially engaged at the locking section (3122) and at least partially engaged at the limiting member (11) so that the closed door leaf (1) is in a locked state; The transmission component (322) is at least partially engaged at the release section (3123) so that the door (1) is in an openable state; The length of the slot in the locking section (3122) is greater than the length of the slot in the releasing section (3123).

6. The locking device for fireproof doors in subway connecting passages according to claim 3, characterized in that, The end of the connector (321) is provided with a fixing part (3211), the fixing part (3211) is provided with a cavity (311) for placing the ball head (323), and the surface of the fixing part (3211) is also provided with a guide groove (312).

7. The locking device for fireproof doors in subway connecting passages according to claim 1, characterized in that, The limiting component (11) has an L-shaped structure.

8. The locking device for fireproof doors in subway connecting passages according to claim 1, characterized in that, It also includes a hinge mechanism (4), installed on the side of the door leaf (1) away from the ball socket (31); The hinge mechanism (4) includes a connecting rod (41) and at least two fixing members (42), with the two ends of the connecting rod (41) being rotatably connected to the two fixing members (42) respectively; The side of the connecting rod (41) is fixedly connected to the door hinge side edge of the door leaf (1), and the connecting rod (41) serves as the rotation axis of the door leaf (1).

9. The locking device for fireproof doors in subway connecting passages according to claim 8, characterized in that, One of the fasteners (42) is embedded in the side wall of the door frame (2), and the other fastener (42) is embedded in the ground; The fastener (42) is a bearing seat or a bushing.

10. The locking device for fireproof doors in subway connecting passages according to claim 1, characterized in that, The door leaf (1) is provided with a door handle (12).

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