Door opening and closing mechanism of multi-overlap door

Abstract

The utility model relates to the technical field of overlapping doors, and discloses a door opening and closing mechanism of a multi-overlapping door, which comprises a door frame, a controller is arranged on the door frame, a main synchronous door moving assembly is arranged at the top of the door frame, and the main synchronous door moving assembly comprises two driving synchronous wheels arranged on the door frame; the two driving synchronous wheels are provided with the same driving synchronous belt, the door frame is provided with a plurality of square motors, the square motors are in transmission connection with the corresponding driving synchronous wheels through transmission parts, and the transmission parts can select couplings and combinations of the couplings and clutches according to needs. Through the design of redundant drive or clutch transmission, the clutch can disconnect power source connection and achieve manual opening and closing when a single power source breaks down, and the system can be automatically switched to a standby power source when a main power source breaks down, so that normal operation of the system is maintained, the reliability and usability of the system are improved, and the service life of the system is prolonged. The method has the effects of high reliability and high availability.

Description

Technical Field

[0001] This application relates to the field of overlapping door technology, and in particular to a door opening and closing mechanism for a multi-overlapping door. Background Technology

[0002] Overlapping doors are a type of door that opens and closes by horizontally moving the door panels relative to each other. In the prior art, CN 117703210 A discloses: "A door opening and closing mechanism for double-leaf overlapping doors, comprising a housing, a power structure fixed to the top of the housing cavity, and two sets of sliding door assemblies movably connected to the middle of the bottom of the housing. Each set of sliding door assemblies includes a moving block fixed to the movable door in the double-leaf overlapping door; the power structure includes a first fixed plate and at least one second fixed plate, the second fixed plate and the adjacent first fixed plate or another adjacent second fixed plate are connected by a quick-release structure; the middle of the first fixed plate is provided with a track... the lower connecting frame is provided with a wire-locking groove adapted to the driven synchronous belt, and a displacement sensor is provided in the wire-locking groove." This door opening and closing mechanism for double-leaf overlapping doors, through the quick-release structure, allows the number of second fixed plates in the power mechanism to be added as needed, enabling the door opening and closing mechanism to adapt to various double-leaf overlapping doors, thus improving its adaptability; furthermore, the first fixed plate and its connecting structure, and the second fixed plate and its connecting structure can be quickly replaced, facilitating the use of the door opening and closing mechanism.

[0003] However, in actual use, since it uses a single motor to directly drive the drive wheel through a coupling to achieve opening and closing, a failure in the power input module may cause the door to fail to open or close according to the predetermined program, requiring staff to repair it. This not only affects the normal use of the door but may also pose safety hazards and negatively impact business operations that rely on the system. Utility Model Content

[0004] To address the issue that using a single motor to directly drive the drive wheel via a coupling for opening and closing affects the normal operation of overlapping doors when the power input module malfunctions, this application provides a multi-overlapping door opening and closing mechanism.

[0005] The opening and closing mechanism for a multi-layered door provided in this application adopts the following technical solution:

[0006] A multi-overlapping door opening and closing mechanism includes a door frame, a controller mounted on the door frame, a main synchronous sliding door assembly mounted on the top of the door frame, the main synchronous sliding door assembly including two active synchronous wheels mounted on the door frame, the two active synchronous wheels being mounted on the same active synchronous belt, several sets of sliding door assemblies mounted on the lower side of the main synchronous sliding door assembly on the door frame, each sliding door assembly including several movable hangers fixedly connected to the movable doors in the overlapping doors, several staggered guide rails mounted on the door frame, the movable hangers being slidably mounted on corresponding guide rails, the movable hanger on the sliding door assembly furthest from the fixed door being connected to a quick-release structure of the active synchronous belt, the movable hangers on adjacent fixed door panels being staggered, one of the active synchronous wheels being connected to a drive device via a clutch transmission component, the transmission power component including a clutch connected to the output end of the drive device for switching the connection state between the active synchronous wheel and the drive device.

[0007] Preferably, the sliding door assembly further includes several secondary synchronous sliding door assemblies, which are respectively disposed on corresponding movable doors. Each secondary synchronous sliding door assembly includes two driven synchronous wheels respectively mounted on corresponding moving hangers. A driven synchronous belt is sleeved on the two driven synchronous wheels, and the driven synchronous belt is connected to the corresponding moving hanger on the adjacent movable door through a quick-release structure.

[0008] Preferably, the drive device includes a square motor mounted on the door frame, the square motor being connected to the input end of the clutch via a coupling, and the output end of the clutch being connected to the drive synchronizing pulley.

[0009] A multi-layered door opening and closing mechanism includes a door frame, a controller mounted on the door frame, a main synchronous sliding door assembly at the top of the door frame, and two active synchronous wheels mounted on the door frame, each with a shared active synchronous belt. Several sets of sliding door assemblies are located below the main synchronous sliding door assembly on the door frame. Each sliding door assembly includes several movable hangers fixedly connected to the movable doors in the multi-layered door system. Several staggered guide rails are also mounted on the door frame, with each movable hanger slidably mounted on its corresponding guide rail. The movable hanger furthest from a fixed door on each sliding door assembly is connected to a quick-release structure of the active synchronous belt. The movable hangers on adjacent fixed door panels are staggered. Both active synchronous wheels are connected to a square motor via a transmission component for redundant drive of the active synchronous wheels. This allows the system to automatically switch to a backup power source in case of a primary power source failure, maintaining normal system operation.

[0010] Preferably, the sliding door assembly further includes several secondary synchronous sliding door assemblies, which are respectively disposed on corresponding movable doors. Each secondary synchronous sliding door assembly includes two driven synchronous wheels respectively mounted on corresponding moving hangers. A driven synchronous belt is sleeved on the two driven synchronous wheels, and the driven synchronous belt is connected to the corresponding moving hanger on the adjacent movable door through a quick-release structure.

[0011] Preferably, the square motor and the active synchronous pulley are directly connected via a coupling.

[0012] Preferably, the square motor is connected to the input end of the clutch via a coupling, and the output end of the clutch is connected to the driving synchronous pulley.

[0013] In summary, this application includes the following beneficial technical effects:

[0014] By using a clutch-driven transmission and / or redundant drive design, if a single-motor clutch-driven active synchronous pulley is used, the connection between the motor and the active synchronous pulley can be temporarily disconnected when a power input failure occurs, enabling manual start and stop. Alternatively, a dual-motor redundant drive can be used, allowing the system to automatically switch to a backup power source when the active power source fails, thus maintaining normal system operation and improving system reliability and availability. Compared to existing technologies, this approach offers higher reliability and greater availability. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of Embodiment 1 of the application;

[0016] Figure 2 This is a three-dimensional structural schematic diagram of embodiment 2 of the application;

[0017] Figure 3 This is a three-dimensional structural schematic diagram of embodiment 3 of the application.

[0018] Explanation of reference numerals in the attached diagram: 1. Door frame; 2. Controller; 3. Main synchronous sliding door assembly; 301. Active synchronous pulley; 302. Active synchronous belt; 4. Square motor; 5. Secondary synchronous sliding door assembly; 501. Driven synchronous pulley; 502. Driven synchronous belt; 6. Guide rail; 7. Hanger assembly; 701. Active hanger; 702. Driven hanger; 8. Overlapping door leaf; 801. Fixed door leaf; 802. Moving door leaf; 9. Clutch. Detailed Implementation

[0019] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0020] Example 1

[0021] This application discloses a door opening and closing mechanism for a multi-overlapping door. (Refer to...) Figure 1A multi-overlapping door opening and closing mechanism includes a door frame 1 and several overlapping door leaves 8 installed inside the door frame 1. The overlapping door leaves 8 are composed of several movable door leaves 801 and fixed door leaves 802. A controller 2 is installed on the door frame 1. A main synchronous sliding door assembly 3 is installed on the top of the door frame 1. The main synchronous sliding door assembly 3 includes two active synchronous wheels 301 installed on the door frame 1. The two active synchronous wheels 301 are equipped with the same active synchronous belt 302. Several group sliding door assemblies are installed on the lower side of the main synchronous sliding door assembly 3 on the door frame 1. The sliding door assembly includes a hanger assembly 7 fixedly connected to the movable door leaves 801 in the overlapping door. The hanger assembly 7 is composed of several movable hangers. Several staggered guide rails 6 are also installed on the door frame 1. The movable hangers are slidably installed on the corresponding guide rails 6. The movable hangers adopt a design of installing multiple rollers on the same plane on the sheet metal connector. The rollers are engaged with the guide rails 6.

[0022] The sliding door assembly can be configured to operate in both directions or in one direction as needed, i.e., two sets of sliding door assemblies or one set of sliding door assemblies. The sliding door assembly also includes several secondary synchronous sliding door assemblies 5. The quantitative relationship between the secondary synchronous sliding door assemblies 5 and the moving door leaf 801 is: a = b - 1, where the number of secondary synchronous sliding door assemblies 5 is set as a and the number of moving door leaves 801 is set as b.

[0023] The movable hangers on two adjacent movable door leaves 801 of a single sliding door assembly are staggered. The movable door leaf 801 furthest from the fixed door in a single sliding door assembly is equipped with two movable hangers as active hangers 701. The outermost active hanger 701 is provided with a wire-locking groove adapted to the active synchronous belt 302, and a displacement sensor is installed in the wire-locking groove. The two active hangers 701 are locked on the corresponding guide rails 6. The active synchronous belt 302 is driven to move by the active synchronous wheel 301, which can drive the active hanger 701 to move.

[0024] The top of each of the remaining sliding door panels 801 is equipped with a secondary synchronous sliding door assembly 5. The sliding hanger connected to the secondary synchronous sliding door assembly 5 is a driven hanger 702. The two driven hangers 702 on a single sliding door panel 801 are both mounted on the same guide rail 6. The secondary synchronous sliding door assembly 5 includes two driven synchronous wheels 501 that are respectively mounted on the corresponding driven hangers 702 through sheet metal parts. The same driven synchronous belt 502 is fitted on the two driven synchronous wheels 501. The remaining active hangers 701 and driven hangers 702 are all equipped with connecting frames with wire-locking grooves that are adapted to the driven synchronous belts. The wire-locking grooves can be used to limit the movement of the driven synchronous belts 502. A displacement sensor is installed in the wire-locking groove. The movement distance of the driven synchronous belts 502 can be detected by the installation of the displacement sensor, which is convenient for judging the opening and closing accuracy of the double-leaf overlapping door.

[0025] One of the active synchronizing pulleys 301 is connected to a drive device via a clutch transmission component. The transmission power component includes a clutch 9 connected to the output end of the drive device. The drive device includes a square motor 4 mounted on the door frame 1. The square motor 4 is connected to the input end of the clutch 9 via a coupling. The output end of the clutch 9 is connected to the active synchronizing pulley 301. The clutch 9 can be an electromagnetic clutch as needed. By controlling the on and off of the clutch 9, the power transmission between the square motor 4 and the active synchronizing pulley 301 can be switched on and off. In the event of a fault in the square motor 4, the power transmission between the square motor 4 and the active synchronizing pulley 301 can be disconnected, and the staff can manually open the door temporarily to ensure temporary operation of the door.

[0026] The implementation principle of the multi-overlapping door opening and closing mechanism in this application embodiment is as follows: When the overlapping door is running normally, the controller 2 controls the clutch 9 to be in the engaged state, realizing the power transmission between the square motor 4 and the active synchronous wheel 301. When the power input of the overlapping door fails, the clutch 9 is in the disengaged state, so that the power transmission between the square motor 4 and the active synchronous wheel 301 is interrupted, and the staff can manually open and close the moving door leaf 801 in time.

[0027] When the double-leaf overlapping door is opened and closed, the square motor 4 drives the active synchronous wheel 301, which is fixedly connected to it, to rotate. The active synchronous wheel 301 drives the active synchronous belt 302 to rotate. The active hanger 701, which is connected to the active synchronous belt 302, moves. When the active hanger 701 moves, it drives the moving door leaf 801 to move, so that the driven synchronous belt 502 moves and drives the remaining moving door leaf 801 to move synchronously, thereby realizing the opening and closing of the double-leaf overlapping door.

[0028] Example 2

[0029] This application discloses a door opening and closing mechanism for a multi-overlapping door. (Refer to...) Figure 2 A multi-overlapping door opening and closing mechanism includes a door frame 1 and several overlapping door leaves 8 installed inside the door frame 1. The overlapping door leaves 8 are composed of several movable door leaves 801 and fixed door leaves 802. A controller 2 is installed on the door frame 1. A main synchronous sliding door assembly 3 is installed on the top of the door frame 1. The main synchronous sliding door assembly 3 includes two active synchronous wheels 301 installed on the door frame 1. The two active synchronous wheels 301 are equipped with the same active synchronous belt 302. Several group sliding door assemblies are installed on the lower side of the main synchronous sliding door assembly 3 on the door frame 1. The sliding door assembly includes a hanger assembly 7 fixedly connected to the movable door leaves 801 in the overlapping door. The hanger assembly 7 is composed of several movable hangers. Several staggered guide rails 6 are also installed on the door frame 1. The movable hangers are slidably installed on the corresponding guide rails 6. The movable hangers adopt a design of installing multiple rollers on the same plane on the sheet metal connector. The rollers are engaged with the guide rails 6.

[0030] The sliding door assembly can be configured to operate in both directions or in one direction as needed, i.e., two sets of sliding door assemblies or one set of sliding door assemblies. The sliding door assembly also includes several secondary synchronous sliding door assemblies 5. The quantitative relationship between the secondary synchronous sliding door assemblies 5 and the moving door leaf 801 is: a = b - 1, where the number of secondary synchronous sliding door assemblies 5 is set as a and the number of moving door leaves 801 is set as b.

[0031] The movable hangers on two adjacent movable door leaves 801 of a single sliding door assembly are staggered. The movable door leaf 801 furthest from the fixed door in a single sliding door assembly is equipped with two movable hangers as active hangers 701. The outermost active hanger 701 is provided with a wire-locking groove adapted to the active synchronous belt 302, and a displacement sensor is installed in the wire-locking groove. The two active hangers 701 are locked on the corresponding guide rails 6. The active synchronous belt 302 is driven to move by the active synchronous wheel 301, which can drive the active hanger 701 to move.

[0032] The top of each of the remaining sliding door panels 801 is equipped with a secondary synchronous sliding door assembly 5. The sliding hanger connected to the secondary synchronous sliding door assembly 5 is a driven hanger 702. The two driven hangers 702 on a single sliding door panel 801 are both mounted on the same guide rail 6. The secondary synchronous sliding door assembly 5 includes two driven synchronous wheels 501 that are respectively mounted on the corresponding driven hangers 702 through sheet metal parts. The same driven synchronous belt 502 is fitted on the two driven synchronous wheels 501. The remaining active hangers 701 and driven hangers 702 are all equipped with connecting frames with wire-locking grooves that are adapted to the driven synchronous belts. The wire-locking grooves can be used to limit the movement of the driven synchronous belts 502. A displacement sensor is installed in the wire-locking groove. The movement distance of the driven synchronous belts 502 can be detected by the installation of the displacement sensor, which is convenient for judging the opening and closing accuracy of the double-leaf overlapping door.

[0033] Both active synchronous pulleys 301 are connected to square motors 4 via transmission components. Square motors 4 are connected to active synchronous pulleys 301 via couplings. The dual motors achieve redundant drive of the active synchronous pulleys 301 to rotate. When the active power source fails, the system can automatically switch to the backup power source to maintain the normal operation of the system. The dual motors can also be started simultaneously as needed.

[0034] The implementation principle of the multi-overlapping door opening and closing mechanism in this application embodiment is as follows: the controller 2 controls the dual motors to achieve redundant drive of the active synchronous wheel 301 to rotate. When one square motor 4 fails, the controller 2 controls the backup square motor 4 to work to maintain the normal operation of the system. The dual motors can also be started simultaneously as needed.

[0035] When the double-leaf overlapping door is opened and closed, the square motor 4 drives the active synchronous wheel 301 fixedly connected to it to rotate. The active synchronous wheel 301 drives the active synchronous belt 302 to rotate. The active hanger 701 connected to the active synchronous belt 302 moves. When the active hanger 701 moves, it drives the moving door leaf 801 to move, so that the driven synchronous belt 502 moves and drives the remaining moving door leaf 801 to move synchronously. Thus, the double-leaf overlapping door can be opened and closed. Compared with embodiment 1, manual opening and closing is not required.

[0036] Example 3

[0037] This application discloses a door opening and closing mechanism for a multi-overlapping door. (Refer to...) Figure 3 A multi-overlapping door opening and closing mechanism includes a door frame 1 and several overlapping door leaves 8 installed inside the door frame 1. The overlapping door leaves 8 are composed of several movable door leaves 801 and fixed door leaves 802. A controller 2 is installed on the door frame 1. A main synchronous sliding door assembly 3 is installed on the top of the door frame 1. The main synchronous sliding door assembly 3 includes two active synchronous wheels 301 installed on the door frame 1. The two active synchronous wheels 301 are equipped with the same active synchronous belt 302. Several group sliding door assemblies are installed on the lower side of the main synchronous sliding door assembly 3 on the door frame 1. The sliding door assembly includes a hanger assembly 7 fixedly connected to the movable door leaves 801 in the overlapping door. The hanger assembly 7 is composed of several movable hangers. Several staggered guide rails 6 are also installed on the door frame 1. The movable hangers are slidably installed on the corresponding guide rails 6. The movable hangers adopt a design of installing multiple rollers on the same plane on the sheet metal connector. The rollers are engaged with the guide rails 6.

[0038] The sliding door assembly can be configured to operate in both directions or in one direction as needed, i.e., two sets of sliding door assemblies or one set of sliding door assemblies. The sliding door assembly also includes several secondary synchronous sliding door assemblies 5. The quantitative relationship between the secondary synchronous sliding door assemblies 5 and the moving door leaf 801 is: a = b - 1, where the number of secondary synchronous sliding door assemblies 5 is set as a and the number of moving door leaves 801 is set as b.

[0039] The movable hangers on two adjacent movable door leaves 801 of a single sliding door assembly are staggered. The movable door leaf 801 furthest from the fixed door in a single sliding door assembly is equipped with two movable hangers as active hangers 701. The outermost active hanger 701 is provided with a wire-locking groove adapted to the active synchronous belt 302, and a displacement sensor is installed in the wire-locking groove. The two active hangers 701 are locked on the corresponding guide rails 6. The active synchronous belt 302 is driven to move by the active synchronous wheel 301, which can drive the active hanger 701 to move.

[0040] The top of each of the remaining sliding door panels 801 is equipped with a secondary synchronous sliding door assembly 5. The sliding hanger connected to the secondary synchronous sliding door assembly 5 is a driven hanger 702. The two driven hangers 702 on a single sliding door panel 801 are both mounted on the same guide rail 6. The secondary synchronous sliding door assembly 5 includes two driven synchronous wheels 501 that are respectively mounted on the corresponding driven hangers 702 through sheet metal parts. The same driven synchronous belt 502 is fitted on the two driven synchronous wheels 501. The remaining active hangers 701 and driven hangers 702 are all equipped with connecting frames with wire-locking grooves that are adapted to the driven synchronous belts. The wire-locking grooves can be used to limit the movement of the driven synchronous belts 502. A displacement sensor is installed in the wire-locking groove. The movement distance of the driven synchronous belts 502 can be detected by the installation of the displacement sensor, which is convenient for judging the opening and closing accuracy of the double-leaf overlapping door.

[0041] Both active synchronizing pulleys 301 are connected to square motors 4 via transmission components. Square motors 4 are connected to the input end of clutches 9 via couplings. The output end of clutches 9 is connected to the active synchronizing pulleys 301. Clutches 9 can be selected as electromagnetic clutches as needed. The active synchronizing pulleys 301 are rotated by dual-motor clutch redundancy. When the active power source fails, the system can automatically switch to the backup power source to maintain the normal operation of the system. The dual motors can also be started simultaneously as needed. Soft start can be achieved through the clutch. When the motors are not running, the power transmission between square motors 4 and active synchronizing pulleys 301 is interrupted, avoiding the active synchronizing pulleys 301 from frequently rotating the rotor of the auxiliary motor when the auxiliary motor is de-energized, which could damage the auxiliary motor.

[0042] The implementation principle of the multi-overlapping door opening and closing mechanism of this application embodiment is as follows: When the overlapping door is running normally, the controller 2 can control two clutches 9 to be engaged at the same time as needed, so that two square motors 4 can work. Alternatively, it can control one clutch 9 to be engaged, so that the corresponding square motor 4 can work. When one square motor 4 fails, the controller 2 controls the clutch 9 to switch working states, so that the backup square motor 4 can run, driving the normal operation of the active synchronous wheel 301.

[0043] When the double-leaf overlapping door opens and closes, the square motor 4 drives the active synchronous pulley 301, which is fixedly connected to it, to rotate. The active synchronous pulley 301 drives the active synchronous belt 302 to rotate, and the active lifting device 701, which is connected to the active synchronous belt 302, moves. When the active lifting device 701 moves, it drives the moving door leaf 801 to move, so that the driven synchronous belt 502 moves and drives the remaining moving door leaf 801 to move synchronously, thereby realizing the opening and closing of the double-leaf overlapping door. Compared with embodiment 2, soft start can be realized. When the motor is not running, the power transmission between the square motor 4 and the active synchronous pulley 301 is interrupted, avoiding the active synchronous pulley 301 from frequently rotating the rotor of the auxiliary motor when the auxiliary motor is de-energized, which could damage the auxiliary motor.

[0044] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0045] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0046] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A door opening and closing mechanism for a multi-overlapping door, comprising a door frame (1), a controller (2) disposed on the door frame (1), a main synchronous sliding door assembly (3) disposed on the top of the door frame (1), the main synchronous sliding door assembly (3) comprising two active synchronous wheels (301) disposed on the door frame (1), the two active synchronous wheels (301) being disposed on the same active synchronous belt (302), a plurality of sliding door assemblies disposed on the lower side of the main synchronous sliding door assembly (3) on the door frame (1), the sliding door assembly comprising a plurality of movable hangers fixedly connected to the movable doors in the overlapping door, a plurality of staggered guide rails (6) disposed on the door frame (1), the movable hangers being slidably disposed on the corresponding guide rails (6), the movable hanger on the sliding door assembly furthest from the fixed door being connected to the active synchronous belt (302) via a quick-release structure, the movable hangers on two adjacent movable door leaves (801) being staggeredly distributed, characterized in that: One of the active synchronizer pulleys (301) is connected to a drive device via a clutch transmission component. The transmission power component includes a clutch (9) connected to the output end of the drive device, used to switch the connection state between the active synchronizer pulley (301) and the drive device.

2. The opening and closing mechanism for a multi-overlapping door according to claim 1, characterized in that: The sliding door assembly also includes several secondary synchronous sliding door assemblies (5), which are respectively installed on the corresponding movable doors. Each secondary synchronous sliding door assembly (5) includes two driven synchronous wheels (501) respectively installed on the corresponding moving hangers. A driven synchronous belt (502) is sleeved on the two driven synchronous wheels (501). The driven synchronous belt (502) is connected to the corresponding moving hanger on the adjacent movable door through a quick-release structure.

3. The opening and closing mechanism for a multi-overlapping door according to claim 1, characterized in that: The drive device includes a square motor (4) mounted on the door frame (1), the square motor (4) is connected to the input end of the clutch (9) via a coupling, and the output end of the clutch (9) is connected to the active synchronous pulley (301).

4. A door opening and closing mechanism for a multi-overlapping door, comprising a door frame (1), a controller (2) disposed on the door frame (1), a main synchronous sliding door assembly (3) disposed on the top of the door frame (1), the main synchronous sliding door assembly (3) comprising two active synchronous wheels (301) disposed on the door frame (1), the two active synchronous wheels (301) being disposed on the same active synchronous belt (302), a plurality of sliding door assemblies disposed on the lower side of the main synchronous sliding door assembly (3) on the door frame (1), the sliding door assembly comprising a plurality of movable hangers fixedly connected to the movable doors in the overlapping door, a plurality of staggered guide rails (6) disposed on the door frame (1), the movable hangers being slidably disposed on the corresponding guide rails (6), the movable hanger on the sliding door assembly furthest from the fixed door being connected to the active synchronous belt (302) via a quick-release structure, the movable hangers on two adjacent movable door leaves (801) being staggeredly distributed, characterized in that: Both active synchronous pulleys (301) are connected to a motor (4) via a transmission component for redundant driving of the active synchronous pulleys (301) to rotate, so that when the active power source fails, the system can automatically switch to the backup power source to maintain the normal operation of the system.

5. The opening and closing mechanism for a multi-overlapping door according to claim 4, characterized in that: The sliding door assembly also includes several secondary synchronous sliding door assemblies (5), which are respectively installed on the corresponding movable doors. Each secondary synchronous sliding door assembly (5) includes two driven synchronous wheels (501) respectively installed on the corresponding moving hangers. A driven synchronous belt (502) is sleeved on the two driven synchronous wheels (501). The driven synchronous belt (502) is connected to the corresponding moving hanger on the adjacent movable door through a quick-release structure.

6. The opening and closing mechanism for a multi-overlapping door according to claim 4, characterized in that: The square motor (4) is directly connected to the active synchronous pulley (301) via a coupling.

7. The opening and closing mechanism for a multi-overlapping door according to claim 4, characterized in that: The input end of the square motor (4) and the clutch (9) are connected by a coupling, and the output end of the clutch (9) is connected to the driving synchronous pulley (301).

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