A lock device for a platform sliding door

Abstract

The application provides a lock device for a platform sliding door. The lock device adopts double hooks, realizes locking and unlocking by power-on and power-off of an electromagnet, and through shape design of an unlocking structure, cooperation of a travel switch, and spatial layout of the electromagnet. Further, the travel switch can adopt a redundant design, and when unlocking or locking mechanical action is in place, unlocking and locking signals are sent to corresponding DCUs to realize joint control of door opening and closing action through DCU control, so as to meet the SIL4 safety level certification in the full-automatic operation mode of a vehicle. The double hooks respectively form left and right closed space structures of the lock pins when the sliding door is closed, so that the hooks cannot be pulled out of the hooks. In addition, through the position layout of the hooks and the pins, the hooks cannot be collided due to overstroke. The lock device provided by the application is compact in arrangement, reasonable and ingenious in position layout of components, simple and reliable in structure, and convenient to install and maintain.

Description

Technical Field

[0001] This application relates to the field of locking structures for platform sliding doors, specifically to a locking device for platform sliding doors, used to add closing and locking functions to the transmission of rail transit sliding doors. Background Technology

[0002] Currently, the opening and closing of platform screen doors is mainly achieved by a motor driving a transmission belt, which in turn pulls the sliding doors to move simultaneously to the left or right, thus closing or opening the doors. In actual operation of subway platform screen doors, these doors need to be opened and closed hundreds of times per day. This requires not only that the sliding doors open flexibly and conveniently, but also that they lock securely and reliably when closed. Correspondingly, the door locking device must be not only efficient, small in size, and lightweight, but also reliable and safe. Furthermore, in order to coordinate with the sliding door's transmission mechanism to achieve closing and locking, unlocking and opening, and other control methods and trajectory requirements for the sliding door, the door locking device must also have a limit switch that can inform the DCU (Digital Control Unit) of the locking device's movement status. Summary of the Invention

[0003] This application aims to provide a locking device for platform sliding doors to meet the aforementioned performance requirements of the locking mechanism for actual operation of rail transit platform sliding doors.

[0004] The locking device for a platform sliding door provided in this application includes: a lock base 1, a lock base plate 11 mounted on the lock base 1, and an electromagnet 2 and an unlocking structure 4 connected by a spring 21, a left locking pin 3, a right locking pin 9, a lower left locking hook positioning pin 51, a lower right locking hook positioning pin 52, a lower left pin shaft 61, a lower right pin shaft 62, an upper left pin shaft 71, an upper right pin shaft 72, a lower left locking hook 81, a lower right locking hook 82, an upper left locking hook 101, and an upper right locking hook 102.

[0005] The lower left and lower right locking hooks 81 and 82 are arranged parallel to each other on both sides of the lock base plate 11, with the back of the hook openings being arc-shaped. The lower left locking hook 81 is fixed to rotate around the left pin 61, and the lower right locking hook 82 is fixed to rotate around the right pin 62. The lower left locking hook 81 is connected to the left locking pin 3, and the lower right locking hook 82 is connected to the right locking pin 9. The upper left and upper right locking hooks 101 and 102 are located above the lower left and lower right locking hooks 81 and 82, arranged parallel to each other on both sides of the lock base plate 11, with the back of the hook openings being arc-shaped. The upper left locking hook 101 is fixed to rotate around the upper left pin 71, and the upper right locking hook 102 is fixed to rotate around the upper right pin 72. The upper left and upper right locking hooks 101 and 102 respectively cooperate with the unlocking structure 4.

[0006] The left locking pin 3 and the right locking pin 9 are arranged parallel to each other on the lock base plate 11, and the left locking pin 3 is provided with a hook pin 161 and the right locking pin 9 is provided with a hook pin 162. The left locking pin 3 is fixedly connected to the left door body of the platform sliding door, and the right locking pin 9 is fixedly connected to the right door body of the platform sliding door.

[0007] When electromagnet 2 is de-energized, the attraction of electromagnet 2 to the unlocking structure disappears, and the restoring force of spring 21 pushes the unlocking structure 4 downward, causing the upper left locking hook 101 to rotate counterclockwise and the upper right locking hook 102 to rotate clockwise. The lower left locking hook 81 rotates clockwise on the left sliding door body via the left locking pin 3, and the lower right locking hook 82 rotates counterclockwise on the right sliding door body via the right locking pin 9; so that the hook pin 161 is wrapped by the left closed lock cavity formed by the hook opening of the upper locking hook 101 and the locking pin positioning opening 811 of the lower left locking hook 81, and the hook pin 162 is wrapped by the right closed lock cavity formed by the locking pin positioning opening 821 of the upper right locking hook 102 and the lower right locking hook 82.

[0008] When electromagnet 2 is energized, the attraction unlocking structure 4 compresses spring 21 and moves it upward, causing the upper left locking hook 101 to rotate clockwise and the upper right locking hook 102 to rotate counterclockwise. The lower left locking hook 81, driven by the left sliding door body via the left locking pin 3, rotates counterclockwise to the lower left locking hook positioning pin 51, and the lower right locking hook 82, driven by the right sliding door body via the right locking pin 9, rotates clockwise to the lower right locking hook positioning pin 52; causing the hook pin 161 to disengage from the left closed lock cavity and the hook pin 162 to disengage from the right closed lock cavity.

[0009] Furthermore, the locking pin positioning port 811 is arranged opposite to the hook opening of the upper left locking hook 101 and is an arc-shaped recess, and the opening direction of the locking pin positioning port 811 is opposite to the opening direction of the hook opening of the lower left locking hook 81; the locking pin positioning port 821 is arranged opposite to the hook opening of the upper right locking hook 102 and is an arc-shaped recess, and the opening direction of the locking pin positioning port 821 is opposite to the opening direction of the hook opening of the lower right locking hook 82.

[0010] Furthermore, the lock base plate 11 is also equipped with a manual unlocking module 14; the manual unlocking module 14 includes a push rod 141 and a slide 142 connected to each other; the slide 142 is fixedly connected to the unlocking structure 4, and the slide 142 moves up and down under the push of the push rod 141, thereby driving the unlocking structure 4 to move up and down.

[0011] Furthermore, the locking device also includes: limit switches 12 and 13 mounted on the lock base plate 11; during the locking process, when the hook pin 161 is wrapped by the left closed lock cavity and the hook pin 162 is wrapped by the right closed lock cavity, the limit switches 12 and 13 simultaneously generate locking signals and send them to the corresponding door control unit (DCU); during the unlocking process, when the lower left lock hook 81 rotates counterclockwise to the lower left lock hook positioning pin 51 and the lower right lock hook 82 rotates clockwise to the lower right lock hook positioning pin 52, the limit switches 12 and 13 generate unlocking signals and send them to the corresponding door control unit (DCU). In some embodiments, a limit switch base 15 is provided; at least one of the limit switches 12 and 13 is mounted on the lock base plate 11 via the limit switch base 15.

[0012] Furthermore, the unlocking structure 4 is U-shaped when viewed from the front of the lock base plate 11, and the electromagnet 2 is connected to the U-shaped opening of the unlocking structure 4 by a spring 21; the detection ends of the limit switches 12 and 13 are respectively in contact with the top surfaces of the two side arms of the notch of the unlocking structure 4.

[0013] The locking device provided in this application employs a double-hook mechanism, with locking and unlocking achieved by the on / off state of an electromagnet. This ensures the reliability and efficiency of the locking mechanism. The device is ingeniously designed through the shape design of the unlocking structure and its compact spatial arrangement with the limit switch and electromagnet. When the locking and unlocking mechanical actions are completed, the limit switch generates a corresponding signal and sends it to the corresponding DCU (Door Control Unit). This allows the DCU to control the door's opening and closing actions in a coordinated manner, meeting the SIL4 safety level certification for fully automated vehicle operation. Attached Figure Description

[0014] Figure 1 A front side view of the locking device provided in the first embodiment of this application.

[0015] Figure 2 A rear side view of the locking device provided in the first embodiment of this application.

[0016] Figure 3 A front view of the locking device provided in this application in a second embodiment. Specific Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0018] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] like Figure 1 , Figure 2 As shown, the locking device for a platform sliding door provided by the present invention includes: a lock base 1, a lock base plate 11 mounted on the lock base 1, an electromagnet 2 and an unlocking structure 4 connected by a spring 21 mounted on the lock base plate 11, a left locking pin 3, a right locking pin 9, a lower left locking hook 81, a lower right locking hook 82, an upper left locking hook 101, an upper right locking hook 102, a lower left locking hook positioning pin 51, a lower right locking hook positioning pin 52, a lower left pin shaft 61, a lower right pin shaft 62, an upper left pin shaft 71, and an upper right pin shaft 72, a manual unlocking module 14, a limit switch seat 15, and limit switches 12 and 13. The limit switch 12 is mounted on the front of the lock base plate 11, the limit switch 13 is mounted on the front of the lock base plate 11 via the limit switch seat 15, and the manual unlocking module 14 is mounted below the limit switch 13.

[0020] like Figure 1 As shown, the lower left hook 81 and lower right hook 82 are arranged parallel to each other on both sides of the lock base plate 11, with the back of the hook openings being arc-shaped. The lower left hook 81 is connected to the left locking pin 3, and the lower right hook 82 is connected to the right locking pin 9. The upper left hook 101 and upper right hook 102 are located above the lower left hook 81 and lower right hook 82, arranged parallel to each other on both sides of the lock base plate 11, and the back of the hook openings are arc-shaped. Figure 1 , Figure 2 (Not shown). The upper left locking hook 101 and the upper right locking hook 102 respectively cooperate with the unlocking structure 4. The lower left locking hook 81 is rotated and fixed with the left pin 61 as the axis of rotation, and the lower right locking hook 82 is rotated and fixed with the right pin 62 as the axis of rotation. The upper left locking hook 101 is rotated and fixed with the upper left pin 71 as the axis of rotation, and the upper right locking hook 102 is rotated and fixed with the upper right pin 72 as the axis of rotation.

[0021] The left locking pin 3 and the right locking pin 9 are arranged in parallel on the lock base plate 11, and both the left locking pin 3 and the right locking pin 9 are provided with hook pins. Figure 1 , Figure 2 (Not shown). The left locking pin 3 is fixedly connected to the left door body of the platform sliding door, and the right locking pin 9 is fixedly connected to the right door body of the platform sliding door.

[0022] When electromagnet 2 is de-energized, the attraction of electromagnet 2 to the unlocking structure disappears, and the restoring force of spring 21 pushes the unlocking structure 4 downward, causing the upper left locking hook 101 to rotate counterclockwise and the upper right locking hook 102 to rotate clockwise. The lower left locking hook 81 rotates clockwise on the left sliding door body via the left locking pin 3, and the lower right locking hook 82 rotates counterclockwise on the right sliding door body via the right locking pin 9; so that the hook pin on the left locking pin 3 is wrapped by the left closed lock cavity formed by the hook opening of the upper locking hook 101 and the locking pin positioning opening 811 of the lower left locking hook 81, and the hook pin on the right locking pin 9 is wrapped by the right closed lock cavity formed by the locking pin positioning opening 821 of the upper right locking hook 102 and the right lower locking hook 82.

[0023] When electromagnet 2 is energized, it attracts the compression spring 21 of unlocking structure 4 to move upward, causing the upper left locking hook 101 to rotate clockwise and the upper right locking hook 102 to rotate counterclockwise. The lower left locking hook 81 rotates counterclockwise to the lower left locking hook positioning pin 51 under the action of the left sliding door body via the left locking pin 3, and the lower right locking hook 82 rotates clockwise to the lower right locking hook positioning pin 52 under the action of the right sliding door body via the right locking pin 9; causing the hook pin on the left locking pin 3 to disengage from the left closed lock cavity, and the hook pin on the right locking pin 9 to disengage from the right closed lock cavity.

[0024] In this embodiment, the operation of the locking device is as follows:

[0025] When the locking device is locked, the electromagnet 2 is de-energized, and the restoring force of the spring 21 pushes the unlocking structure 4 downward, causing the upper left locking hook 101 to rotate counterclockwise and the upper right locking hook 102 to rotate clockwise. The lower left locking hook 81 rotates clockwise under the action of the left sliding door body, and the lower right locking hook 82 rotates counterclockwise under the action of the right sliding door body; so that the hook pin on the left locking pin 3 is wrapped by the left closed lock cavity formed by the hook opening of the upper locking hook 101 and the locking pin positioning opening 811 of the lower left locking hook 81, and the hook pin on the right locking pin 9 is wrapped by the right closed lock cavity formed by the locking pin positioning opening 821 of the upper right locking hook 102 and the lower right locking hook 82. After the hook pin on the left locking pin 3 is wrapped by the left closed lock cavity and the hook pin on the right locking pin 9 is wrapped by the right closed lock cavity, the limit switches 12 and 13 are triggered to generate a locking signal to the corresponding door control unit (DCU).

[0026] When the lock device unlocks, the electromagnet 2 is energized, attracting the compression spring 21 of the unlocking structure 4 to move upward, causing the upper left locking hook 101 to rotate clockwise and the upper right locking hook 102 to rotate counterclockwise. The lower left locking hook 81, driven by the left sliding door body via the left locking pin 3, rotates counterclockwise to the lower left locking hook positioning pin 51, and the lower right locking hook 82, driven by the right sliding door body via the right locking pin 9, rotates clockwise to the lower right locking hook positioning pin 52; causing the hook pin 1 on the left locking pin 3 to disengage from the left closed lock cavity and the hook pin on the right locking pin 9 to disengage from the right closed lock cavity. When the hook pin on the left locking pin 3 disengages from the left closed lock cavity and the hook pin on the right locking pin 9 disengages from the right closed lock cavity, the limit switches 12 and 13 are triggered to generate an unlocking signal to the corresponding door control unit (DCU).

[0027] Furthermore, the locking pin positioning port 811 is arranged opposite to the hook opening of the upper left locking hook 101 and is an arc-shaped recess, and the opening direction of the locking pin positioning port 811 is opposite to the opening direction of the hook opening of the lower left locking hook 81; the locking pin positioning port 821 is arranged opposite to the hook opening of the upper right locking hook 102 and is an arc-shaped recess, and the opening direction of the locking pin positioning port 821 is opposite to the opening direction of the hook opening of the lower right locking hook 82.

[0028] like Figure 2 As shown, the manual unlocking module 14 is installed below the limit switch 13. The manual unlocking module 14 includes a push rod 141 and a slide 142 connected to each other; the unlocking structure 4 is fixedly connected to the slide 142. When the slide 142 moves up and down under the push of the push rod 141, it drives the unlocking structure 4 to move up and down to achieve manual unlocking.

[0029] When manually unlocking the locking device: Using a manual wrench or a matching key on the platform sliding door, the push rod 141 pushes the manual unlocking module 14 upwards. Simultaneously, the manual unlocking module 14 moves upwards, causing the unlocking structure 4 to move upwards, which in turn rotates the upper left and upper right locking hooks 101 and 102, opening the left and right closed lock cavities. Then, using the wrench on the platform sliding door, the sliding door is manually pushed open, causing the left locking pin 3 and right locking pin 9 to move in opposite directions. This causes the lower left locking hook 81 to rotate counterclockwise and stop at the lower left locking hook positioning pin 51, while the lower right locking hook 82 rotates clockwise and stops at the lower right locking hook positioning pin 52, releasing the hooks on the left locking pin 3 and right locking pin 9. As the left and right shielding sliding doors move left and right respectively, the platform sliding door is manually opened.

[0030] Preferably, the unlocking structure 4 is U-shaped when viewed from the front of the lock base plate 11, and the electromagnet 2 is connected to the U-shaped opening of the unlocking structure 4 by a spring 21; the detection ends of the limit switches 12 and 13 are respectively in contact with the top surfaces of the two side arms of the notch of the unlocking structure 4.

[0031] Figure 3 A front view of another embodiment of the locking device provided in this application. In this embodiment, compared with the previous embodiment ( Figure 1 , Figure 2 When the reference numerals in the illustrated embodiments are the same, the corresponding reference numerals also have the same meaning. For example... Figure 3 As shown, the lock base plate 11 is U-shaped when viewed from the front. The electromagnet 2 is connected to the U-shaped opening of the unlocking structure 4 by a spring 21. Limit switches 12 and 13 are both located on the front of the lock base plate 11. The detection ends of the limit switches 12 and 13 are in contact with the top surfaces of the two side arms of the notch of the unlocking structure 4, respectively.

[0032] like Figure 3 As shown, the left locking pin 3 and the right locking pin 9 are arranged parallel to each other on the lock base plate 11, with the left locking pin 3 equipped with a hook pin 161 and the right locking pin 9 equipped with a hook pin 162. The left locking pin 3 is fixedly connected to the left door body of the platform sliding door, and the right locking pin 9 is fixedly connected to the right door body of the platform sliding door. When the platform sliding door is opened or closed by the transmission mechanism, the left locking pin 3 and the right locking pin 9 are moved in opposite directions or towards each other.

[0033] The lower left and lower right locking hooks 81 and 82 are parallel to each other on both sides of the lock base plate 11, and the back of their hook openings is arc-shaped. The lower left locking hook 81 is connected to the left locking pin 3, and the lower right locking hook 82 is connected to the right locking pin 9. The upper left and upper right locking hooks 101 and 102 are located above the lower left and lower right locking hooks 81 and 82, parallel to each other on both sides of the lock base plate 11, and the back of their hook openings is arc-shaped. The upper left and upper right locking hooks 101 and 102 respectively cooperate with the unlocking structure 4.

[0034] Similarly, the lower left locking hook 81 is fixed to rotate around the left pin 61, and the lower right locking hook 82 is fixed to rotate around the right pin 62. The upper left locking hook 101 is fixed to rotate around the upper left pin 71, and the upper right locking hook 102 is fixed to rotate around the upper right pin 72.

[0035] The locking pin positioning opening 811 is positioned opposite to the hook opening of the upper left locking hook 101 and is an arc-shaped recess. The direction of the recess of the locking pin positioning opening 811 is opposite to the opening direction of the hook opening of the lower left locking hook 81. The locking pin positioning opening 821 is positioned opposite to the hook opening of the upper right locking hook 102 and is an arc-shaped recess. The direction of the recess of the locking pin positioning opening 821 is opposite to the opening direction of the hook opening of the lower right locking hook 82.

[0036] Figure 3The locking device in the illustrated embodiment operates as follows:

[0037] During the locking process, the electromagnet 2 is de-energized, and the restoring force of the spring 21 pushes the unlocking structure 4 downward; the left locking pin 3 and the right locking pin 9 move in opposite directions driven by the sliding door. The hook pin 161 pushes the lower left locking hook 81 and the upper left locking hook 101 to rotate respectively, so that the hook pin 161 falls into the notch of the locking pin positioning port 811; similarly, the hook pin 161 pushes the lower right locking hook 82 and the upper right locking hook 102 to rotate respectively, so that the hook pin 162 falls into the notch of the locking pin positioning port 821. Then, under the elastic reset of the spring 21, the unlocking structure 4 is driven to move downward, and the unlocking structure 4 drives the upper left locking hook 102 to rotate counterclockwise and the upper right locking hook 102 to rotate clockwise to a fixed position, so that the hook pin 161 is wrapped by the left closed lock cavity and the hook pin 162 is wrapped by the right closed lock cavity. After the hook pin 161 is enclosed by the left closed lock cavity and the hook pin 162 is enclosed by the right closed lock cavity, the limit switches 12 and 13 are triggered to generate a locking signal and send it to the corresponding gate control unit (DCU).

[0038] During the unlocking process, the electromagnet 2 is energized, attracting the compression spring 21 of the unlocking structure 4 to move upward, causing the upper left locking hook 101 to rotate clockwise and the upper right locking hook 102 to rotate counterclockwise. The lower left locking hook 81, driven by the left sliding door body via the left locking pin 3, rotates counterclockwise to the lower left locking hook positioning pin 51, and the lower right locking hook 82, driven by the right sliding door body via the right locking pin 9, rotates clockwise to the lower right locking hook positioning pin 52; causing the hook pin 1 on the left locking pin 3 to disengage from the left closed lock cavity and the hook pin on the right locking pin 9 to disengage from the right closed lock cavity. When the hook pin on the left locking pin 3 disengages from the left closed lock cavity and the hook pin on the right locking pin 9 disengages from the right closed lock cavity, the limit switches 12 and 13 are triggered to generate an unlocking signal to the corresponding door control unit (DCU).

[0039] Compared with existing locking devices for platform sliding doors, the locking device provided in this application has the advantages of compact layout, simple and reliable structure, and convenient installation and maintenance; it can well meet the performance requirements of the relevant locking device for the actual operation of platform sliding doors.

[0040] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A locking device for a platform sliding door, characterized in that, The locking device includes: a lock base (1), a lock base plate (11) mounted on the lock base (1), and an electromagnet (2) connected by a spring (21) and an unlocking structure (4), a left locking pin (3), a right locking pin (9), a left lower locking hook positioning pin (51), a right lower locking hook positioning pin (52), a left lower pin (61), a right lower pin (62), a left upper pin (71), a right upper pin (72), a left lower locking hook (81), a right lower locking hook (82), a left upper locking hook (101), and a right upper locking hook (102). The lower left locking hook (81) and the lower right locking hook (82) are arranged parallel to each other on both sides of the lock base plate (11), and the back of the hook opening is arc-shaped; the lower left locking hook (81) is fixed by rotating on the lower left pin (61), and the lower right locking hook (82) is fixed by rotating on the lower right pin (62); the lower left locking hook (81) cooperates with the left locking pin (3), and the lower right locking hook (82) cooperates with the right locking pin (9); The upper left locking hook (101) and the upper right locking hook (102) are located above the lower left locking hook (81) and the lower right locking hook (82), and are set parallel to each other on both sides of the lock base plate (11), with the back of the hook openings being arc-shaped; the upper left locking hook (101) is fixed to rotate around the upper left pin (71), and the upper right locking hook (102) is fixed to rotate around the upper right pin (72); the upper left locking hook (101) and the upper right locking hook (102) are respectively matched with the unlocking structure (4); The left locking pin (3) and the right locking pin (9) are arranged in parallel on the lock base plate (11), and the left locking pin (3) is provided with a hook pin (161) and the right locking pin (9) is provided with a hook pin (162); the left locking pin (3) is fixedly connected to the left door body of the platform sliding door, and the right locking pin (9) is fixedly connected to the right door body of the platform sliding door; When the electromagnet (2) is de-energized, the attraction of the electromagnet (2) to the unlocking structure disappears, and the restoring force of the spring (21) pushes the unlocking structure (4) downward, causing the upper left locking hook (101) to rotate counterclockwise and the upper right locking hook (102) to rotate clockwise; the lower left locking hook (81) rotates clockwise under the left sliding door body via the left locking pin (3), and the lower right locking hook (82) rotates counterclockwise under the right sliding door body via the right locking pin (9); so that the hook pin (161) is wrapped in the left closed lock cavity formed by the hook mouth of the upper left locking hook (101) and the locking pin positioning mouth (811) of the lower left locking hook (81), and the hook pin (162) is wrapped in the right closed lock cavity formed by the hook mouth of the upper right locking hook (102) and the locking pin positioning mouth (821) of the lower right locking hook (82); The locking pin positioning port (811) of the lower left locking hook (81) is set opposite to the hook opening of the upper left locking hook (101) and is an arc-shaped recess. The opening direction of the locking pin positioning port (811) of the lower left locking hook (81) is opposite to the opening direction of the hook opening of the lower left locking hook (81). The locking pin positioning port (821) of the lower right locking hook (82) is set opposite to the hook opening of the upper right locking hook (102) and is an arc-shaped recess. The opening direction of the locking pin positioning port (821) of the lower right locking hook (82) is opposite to the opening direction of the hook opening of the lower right locking hook (82). When the electromagnet (2) is energized, it attracts the unlocking structure (4) to compress the spring (21) and move it upward, causing the upper left locking hook (101) to rotate clockwise and the upper right locking hook (102) to rotate counterclockwise; the lower left locking hook (81) rotates counterclockwise to the lower left locking hook positioning pin (51) driven by the left sliding door body via the left locking pin (3), and the lower right locking hook (82) rotates clockwise to the lower right locking hook positioning pin (52) driven by the right sliding door body via the right locking pin (9); causing the hook pin (161) to disengage from the left closed lock cavity and the hook pin (162) to disengage from the right closed lock cavity; The lock base plate (11) is also equipped with a manual unlocking module (14); the manual unlocking module (14) includes a push rod (141) and a slide (142) connected to each other; the slide (142) is fixedly connected to the unlocking structure (4), and the slide (142) moves up and down under the push of the push rod (141), thereby driving the unlocking structure (4) to move up and down; The locking device also includes limit switches (12, 13) mounted on the lock base plate (11).

2. The locking device as claimed in claim 1, characterized in that, During the locking process, when the hook pin (161) is wrapped by the left closed lock cavity and the hook pin (162) is wrapped by the right closed lock cavity, the limit switches (12, 13) simultaneously generate a locking signal and send it to the corresponding door control unit (DCU); during the unlocking process, when the lower left lock hook (81) rotates counterclockwise to the lower left lock hook positioning pin (51) and the lower right lock hook (82) rotates clockwise to the lower right lock hook positioning pin (52), the limit switches (12, 13) generate an unlocking signal and send it to the corresponding door control unit (DCU).

3. The locking device as described in claim 2, characterized in that, The unlocking structure (4) is U-shaped when viewed from the front of the lock base plate (11). The electromagnet (2) is connected to the U-shaped opening of the unlocking structure (4) by a spring (21). The detection ends of the limit switches (12, 13) are in contact with the top surfaces of the two side arms of the notch of the unlocking structure (4).

4. The locking device as described in claim 2, characterized in that, The locking device further includes: a limit switch base (15); at least one of the limit switches (12, 13) is mounted on the lock base plate (11) via the limit switch base (15).

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