Mechanically maintained electromagnetic lock and sliding door

Abstract

The utility model relates to the technical field of electromagnetic locks, and discloses a mechanically maintained electromagnetic lock and sliding door. It comprises a first unit and a second unit, the first unit comprises a first movable plate and a connecting assembly connected to each other, the connecting assembly comprises a mounting plate, the mounting plate is provided with a limiting column and a first locking tongue and a second locking tongue are hingedly connected, the first movable plate is provided with a first locking pin slidably connected to the mounting plate, the first movable plate is provided with a first limiting opening suitable for active connection with the first locking tongue, and the second locking tongue is provided with a bayonet; the second unit comprises a third movable plate and a manual unlocking assembly rotatably connected to each other, the third movable plate is provided with a second locking pin, the second locking pin is suitable for matching with the bayonet, and the manual unlocking assembly comprises a pressing block movably connected to the third movable plate. The utility model maintains a locked state with a mechanical structure, and will not be automatically unlocked even if a power outage or poor circuit contact occurs, which is safer and more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic locks, in particular to a mechanically held electromagnetic lock and a sliding door. Background Art

[0002] At present, most stations in the rail transit system are equipped with a platform screen door system, which separates the public area from the track area to ensure the safety of passengers. When the train enters the station, the control system first controls the electromagnetic lock of the platform screen door to be attracted and unlocked, and then the motor drives the sliding door to open; when closing the door, the motor drives the sliding door to close, and the electromagnetic lock locks the sliding door. At present, most electromagnetic locks on the market are electrically maintained and need to be continuously powered to maintain the closed state of the electromagnetic lock. If a power outage or poor circuit contact occurs, the electromagnetic lock will automatically unlock, which may easily bring safety hazards. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the utility model first provides a mechanically held electromagnetic lock, comprising a first unit and a second unit, wherein the first unit comprises a first movable plate and a connecting assembly connected to each other, wherein the connecting assembly comprises a mounting plate, wherein the mounting plate is provided with a limiting column and a first locking tongue and a second locking tongue are hingedly connected, wherein the first movable plate is provided with a first locking pin slidably connected to the mounting plate, wherein the first movable plate is provided with a first limiting opening suitable for active connection of the first locking tongue, and the second locking tongue is provided with a bayonet;

[0004] The second unit comprises a third movable plate and a manual unlocking assembly which are rotatably connected to each other, the third movable plate is provided with a second locking pin, the second locking pin is adapted to fit the bayonet, and the manual unlocking assembly comprises a pressing block movably connected to the third movable plate;

[0005] When locking is required, the first unit and the second unit are moved closer to each other until the second lock pin is inserted into the bayonet, the second lock tongue is rotated to abut against the limit column, the first lock pin moves downward and abuts against the second lock tongue to achieve a mechanical holding function, and the first lock tongue abuts against the pressing block to complete the locking action;

[0006] When manual unlocking is required, the pressing block is driven to move, and the pressing block pushes the first locking tongue to rotate. The first locking tongue drives the first movable plate to move up, so as to drive the first locking pin to move up, so that the first locking pin is disengaged from the second locking tongue, and the second unit is pulled away from the first unit, and the second locking pin is disengaged from the bayonet, thereby completing the unlocking action.

[0007] Optionally, the second lock tongue includes a first limiting portion, and when unlocked, the first limiting portion abuts against the first lock pin; when locked, two sides of the second lock tongue abut against the limiting column and the first lock pin respectively.

[0008] Optionally, the connecting assembly further comprises a connecting piece, one end of which is connected to the first locking tongue, and the other end of which is provided with a sliding block, and the sliding block is slidably connected to the first limiting opening.

[0009] Optionally, the connecting assembly also includes a second movable plate and a first fixed plate fixed on the mounting plate, the first fixed plate is provided with a through sliding groove, the first locking pin is passed through the second movable plate, the mounting plate is provided with a second limiting opening adapted to the first locking pin, and the second movable plate slides up and down in the sliding groove.

[0010] Optionally, the connecting assembly also includes a second fixed plate fixedly connected to the mounting plate, the second fixed plate is provided with a limit block, the first movable plate is provided with a third limit opening adapted to the limit block, and the limit block is slidably connected to the third limit opening up and down.

[0011] Optionally, the manual unlocking assembly includes a fourth movable plate, the pressing block is arranged on the fourth movable plate, and the fourth movable plate is hinged to the third movable plate.

[0012] Optionally, a pull block is provided on the fourth movable plate, and an escape opening is provided on the third movable plate, and the pull block is connected to the escape opening in a left-right sliding manner.

[0013] Optionally, the first unit also includes an electromagnetic component, which includes an electromagnet for driving the first movable plate to move up and down; when electric unlocking is required, the electromagnet drives the first movable plate to move up, so as to drive the first lock pin to move up, so that the first lock pin is disengaged from the second lock tongue, and the second lock pin is disengaged from the bayonet, thereby completing the unlocking action.

[0014] Optionally, a first connecting portion is provided at the lower end of the electromagnet, a second connecting portion is provided at the lower end of the first movable plate, and the first connecting portion is connected to the second connecting portion.

[0015] Compared with the prior art, the mechanically maintained electromagnetic lock in the utility model maintains the locked state with a mechanical structure by cooperating with the second lock tongue, the first lock pin, the second lock pin and the limit column, and realizes manual unlocking by cooperating with the first lock tongue and the pressing block. Even if a power outage or poor circuit contact occurs, it will not be automatically unlocked, which is safer and more reliable.

[0016] In addition, the utility model provides a sliding door, comprising the mechanically retained electromagnetic lock as described above.

[0017] Compared with the prior art, the sliding door described in the present invention and the above-mentioned mechanically held electromagnetic lock have the same advantages over the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of an electromagnetic lock according to an embodiment of the present utility model;

[0019] Figure 2 An exploded view of the first unit of an embodiment of the utility model;

[0020] Figure 3 It is a schematic diagram of the locking state of the first unit of an embodiment of the utility model;

[0021] Figure 4 It is a schematic diagram of the unlocked state of the first unit of an embodiment of the utility model;

[0022] Figure 5 This is a structural diagram of the first movable plate of an embodiment of the utility model;

[0023] Figure 6 It is a schematic diagram of the combination of the first movable plate, the second fixed plate and the mounting plate of an embodiment of the utility model;

[0024] Figure 7 A schematic diagram of the combination of a first fixed plate and a second movable plate in an embodiment of the utility model;

[0025] Figure 8 is a schematic diagram of a second unit of an embodiment of the utility model;

[0026] Fig. 9 It is a schematic diagram of the second unit of the embodiment of the utility model from another angle;

[0027] Fig.10 This is a schematic diagram of a first locking tongue and a connecting piece according to an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Electromagnetic assembly; 11. Electromagnet; 111. First connection part; 12. First movable plate; 121. First limiting opening; 122. Third limiting opening; 123. Second connection part; 13. Third fixed plate; 2. Connecting assembly; 21. Mounting plate; 211. Limiting column; 212. Second limiting opening; 22. First fixed plate; 221. Slide groove; 222. Opening; 23. Second fixed plate; 231. Limiting block; 24. Second movable plate; 241. First locking pin; 25. First locking tongue; 26. Connecting piece; 261. Sliding block; 27. Second locking tongue; 271. First limiting part; 272. Second limiting part; 273. Bayonet; 3. Third movable plate; 31. Second locking pin; 32. Avoidance opening; 4. Manual unlocking assembly; 41. Pressing block; 42. Fourth movable plate; 43. Pulling block; 44. Pull rod. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships that are based on the positions or location relationships when the product is in normal use.

[0032] The terms "first" and "second" are used only for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The drawings of the embodiments of the present utility model are provided with a coordinate system XYZ, wherein the positive direction of the X-axis represents the left, the reverse direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, the reverse direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the reverse direction of the Z-axis represents the bottom.

[0033] The utility model embodiment provides a mechanically held electromagnetic lock, combined with Figure 1-10 As shown, it includes a first unit and a second unit, the first unit includes a first movable plate 12 and a connecting assembly 2 connected to each other, the connecting assembly 2 includes a mounting plate 21, the mounting plate 21 is provided with a limiting column 211 and is hingedly connected with a first locking tongue 25 and a second locking tongue 27, the first movable plate 12 is provided with a first locking pin 241 slidably connected to the mounting plate 21, the first movable plate 12 is provided with a first limiting opening 121 suitable for active connection of the first locking tongue 25, and the second locking tongue 27 is provided with a bayonet 273;

[0034] The second unit comprises a third movable plate 3 and a manual unlocking assembly 4 which are rotatably connected to each other, the third movable plate 3 is provided with a second locking pin 31, the second locking pin 31 is adapted to fit the bayonet 273, and the manual unlocking assembly 4 comprises a pressing block 41 which is movably connected to the third movable plate 3;

[0035] When locking is required, the first unit and the second unit move closer to each other until the second lock pin 31 is engaged with the bayonet 273, the second lock tongue 27 rotates to abut against the limiting column 211, and the first lock pin 241 moves downward to abut against the second lock tongue 27 to achieve a mechanical holding function, and the first lock tongue 25 abuts against the pressing block 41 to complete the locking action;

[0036] When manual unlocking is required, the pressing block 41 is driven to move, and the pressing block 41 pushes the first locking tongue 25 to rotate. The first locking tongue 25 drives the first movable plate 12 to move upward, thereby driving the first locking pin 241 to move upward, so that the first locking pin 241 is disengaged from the second locking tongue 27, and the second unit is pulled away from the first unit, and the second locking pin 31 is disengaged from the bayonet 273, completing the unlocking action.

[0037] When electromagnetic locks are used on sliding doors of subway platforms, there should be one on each of the left and right doors, and the electromagnetic locks on the left and right doors should be symmetrical to each other. Figure 1 As shown, in this embodiment, the electromagnetic lock is arranged on the left door, wherein the first unit is mounted on a wall or a carriage adapted to the sliding door, and the second unit is mounted on the sliding door and slides left and right with the sliding door.

[0038] like Figure 3 As shown, in this embodiment, the mounting plate 21 is square, and screw holes suitable for mounting are provided at the four corners. The first locking pin 241 is slidably disposed in the middle of the mounting plate 21, and the first locking tongue 25 is disposed above the first locking pin 241. The lower end of the second locking tongue 27 is hingedly connected to the mounting plate 21.

[0039] like Fig. 9 As shown, in this embodiment, the second lock pin 31 is fixed to a side of the third movable plate 3 close to the mounting plate 21. The third movable plate 3 is provided with two screw holes suitable for mounting on the sliding door. The third movable plate 3 slides left and right relative to the mounting plate 21 together with the sliding door.

[0040] When the electromagnetic lock is in a locked state, the left and right sides of the second lock tongue 27 respectively abut against the limit column 211 and the first lock pin 241. At this time, the second lock pin 31 is engaged with the second lock tongue 27, the second lock tongue 27 cannot be rotated to unlock, and the pressing block 41 abuts against the right side of the first lock tongue 25.

[0041] When manual unlocking is required, the manual unlocking component 4 and the connecting component 2 cooperate, and the manual unlocking component 4 is pulled to the left by external force. At this time, the pressing block 41 presses the first lock tongue 25 to the left to make the first lock tongue 25 rotate clockwise. When the first lock tongue 25 rotates, it drives the first movable plate 12 to move upward, so that the first lock pin 241 moves up to release the lock of the second lock tongue 27. At this time, the third movable plate 3 is driven to move to the right by external force to release the lock between the second lock pin 31 and the second lock tongue 27.

[0042] The second locking tongue 27 includes a first limiting portion 271. When unlocked, the first limiting portion 271 abuts against the first locking pin 241. When locked, two sides of the second locking tongue 27 abut against the limiting column 211 and the first locking pin 241 respectively.

[0043] The second locking tongue 27 further includes a second limiting portion 272. Figure 1 and 3 As shown, in this embodiment, the first lock pin 241 and the second lock pin 31 are both columnar, and the bayonet 273 is hook-shaped. When in the locked state, the limiting column 211 is limited and abutted against the left side of the first limiting portion 271, and the first lock pin 241 is limited and abutted against the right side of the second limiting portion 272. At this time, the second lock tongue 27 cannot rotate left and right, and the second lock pin 31 is hooked by the bayonet 273 and cannot move left and right.

[0044] When in the unlocked state, the first lock pin 241 moves upward to release the limit on the second limiting portion 272. At this time, the second lock pin 31 can move to the right to drive the second lock tongue 27 to rotate clockwise until the right side of the first limiting portion 271 abuts against the first lock pin 241, and the second lock pin 31 gradually disengages from the bayonet 273.

[0045] The connecting assembly 2 further includes a connecting member 26 , one end of which is connected to the first locking tongue 25 , and the other end of which is provided with a sliding block 261 , which is slidably connected to the first limiting opening 121 .

[0046] like Fig.10 As shown, in this embodiment, the first limit opening 121 is a horizontal oval. When the first locking tongue 25 swings left and right, one end of the connecting member 26 swings in the same direction as the first locking tongue 25, and the other end of the connecting member 26 swings in the opposite direction, so that the slider 261 slides left and right in the first limit opening 121. At the same time, under the action of the connecting member 26, the slider 261 transmits an upward or downward force to the first limit opening 121, so that the first movable plate 12 can be linked with the first locking tongue 25, and the first movable plate 12 can move up and down to make the first locking tongue 25 swing left and right, and the first locking tongue 25 swinging left and right can also reversely control the first movable plate 12 to move up and down.

[0047] The first locking tongue 25 is fixedly connected to the lower end of the connecting member 26, and the first limiting opening 121 is connected to the upper end of the connecting member 26. When the first locking tongue 25 rotates clockwise, the lower end of the connecting member 26 also rotates clockwise, and the upper end of the connecting member 26 rotates counterclockwise. At this time, the slider 261 moves rightward in the first limiting opening 121 and provides an upward force, thereby driving the first movable plate 12 to move upward, so that the first movable plate 12 moves upward and drives the first locking pin 241 to move upward and unlock.

[0048] The connecting piece 26 is arranged to link the first movable plate 12 and the first locking tongue 25, and further link the first locking tongue 25 and the first locking pin 241, so that when the first locking tongue 25 rotates, it can drive the first locking pin 241 to move upward to achieve unlocking, and the manual unlocking function is realized by using an ingenious mechanical structure.

[0049] The connecting assembly 2 also includes a second movable plate 24 and a first fixed plate 22 fixed on the mounting plate 21, the first fixed plate 22 is provided with a through slide groove 221, the first locking pin 241 is passed through the second movable plate 24, the mounting plate 21 is provided with a second limiting opening 212 adapted to the first locking pin 241, and the second movable plate 24 slides up and down in the slide groove 221.

[0050] like Figure 2 and 3 As shown, in this embodiment, one end of the first lock pin 241 is fixed to the first movable plate 12, the middle part of the first lock pin 241 is fixed to the second movable plate 24, and the other end of the first lock pin 241 is abutted and connected with the second lock tongue 27. When the first movable plate 12 moves up and down, the second movable plate 24 and the first lock pin 241 both move up and down synchronously.

[0051] like Figure 2 and 7 As shown, in this embodiment, the slide groove 221 is formed by a depression on one side of the first fixed plate 22 close to the mounting plate 21, and the width of the slide groove 221 matches the width of the second movable plate 24. The first fixed plate 22 is provided with an opening 222 connected to the slide groove 221 on one side away from the mounting plate 21. The first locking pin 241 extends out of the opening 222 and slides up and down in the opening 222. The shape of the opening 222 is the same as the shape of the second limiting opening 212, and the position of the opening 222 matches the position of the second limiting opening 212. The first locking pin 241 passes through the second limiting opening 212 and the opening 222 at the same time.

[0052] The slide groove 221 limits the up and down movement distance of the second movable plate 24 , and the first fixed plate 22 fixes the position of the second movable plate 24 from the front and rear directions, which makes the structure more stable without affecting the movement of the second movable plate 24 .

[0053] The connecting assembly 2 also includes a second fixed plate 23 fixedly connected to the mounting plate 21, a limit block 231 is provided on the second fixed plate 23, and a third limit opening 122 adapted to the limit block 231 is provided on the first movable plate 12, and the limit block 231 is slidably connected to the third limit opening 122 up and down.

[0054] like Figure 6 As shown, in this embodiment, the second fixed plate 23 is located between the mounting plate 21 and the first movable plate 12, and the first movable plate 12 slides up and down relative to the second fixed plate 23. The shape and size of the third limiting opening 122 are the same as the shape and size of the second limiting opening 212. And there are four limiting blocks 231 and four third limiting openings 122. This arrangement makes the connection structure more stable, and at the same time, further limits the up and down movement distance of the first movable plate 12.

[0055] like Figure 2 As shown, in this embodiment, the electromagnetic assembly 1 further includes a third fixing plate 13, and the front and rear sides of the third fixing plate 13 are simultaneously fixedly connected to the electromagnet 11 and the mounting plate 21, so that the connection structure between the electromagnet 11 and the mounting plate 21 is more stable.

[0056] The manual unlocking assembly 4 includes a fourth movable plate 42 , the pressing block 41 is disposed on the fourth movable plate 42 , and the fourth movable plate 42 is hinged to the third movable plate 3 .

[0057] like Fig. 9 As shown, in this embodiment, the lower end of the fourth movable plate 42 is hinged to the lower end of the third movable plate 3, and the pressing block 41 is provided at the upper end of the fourth movable plate 42. When the third movable plate 3 moves left and right with the sliding door, the fourth movable plate 42 moves together with the third movable plate 3.

[0058] The fourth movable plate 42 is provided with a pull block 43 , the third movable plate 3 is provided with an escape opening 32 , and the pull block 43 is slidably connected to the escape opening 32 leftward and rightward.

[0059] like Figure 8 and 9 As shown, the pull block 43 passes through the avoidance opening 32 and slides left and right in the avoidance opening 32 . The pull block 43 is connected to a pull rod 44 through bolts, and the pull rod 44 is convenient for the user to pull the pull block 43 .

[0060] In this embodiment, pulling the pull rod 44 to the left causes the pull block 43 to move to the left. At this time, the pull block 43 drives the fourth movable plate 42 to move to the left. The pressing block 41 presses the first locking tongue 25 to the left to make the first locking tongue 25 rotate clockwise, thereby driving the first movable plate 12 to move upward, and the first locking pin 241 is unlocked as the first movable plate 12 moves upward.

[0061] The first unit also includes an electromagnetic component 1, which includes an electromagnet 11 for driving the first movable plate 12 to move up and down; when electric unlocking is required, the electromagnet 11 drives the first movable plate 12 to move up, so as to drive the first lock pin 241 to move up, so that the first lock pin 241 is disengaged from the second lock tongue 27, and the second lock pin 31 is disengaged from the bayonet 273, thereby completing the unlocking action.

[0062] When electric unlocking is required, the electromagnetic component 1 and the connecting component 2 cooperate, and the electromagnet 11 controls the first movable plate 12 to move upward to move the first lock pin 241 upward, thereby releasing the lock on the right side of the second lock tongue 27, allowing the second lock tongue 27 to rotate a short distance to the right. At this time, the sliding door drives the third movable plate 3 to move to the right, so that the second lock pin 31 drives the second lock tongue 27 to rotate to the right, until the second lock tongue 27 is again in contact with the first lock pin 241 that has moved upward. After the second lock tongue 27 can no longer rotate, the second lock pin 31 continues to move to the right and disengages from the lock of the second lock tongue 27.

[0063] A first connection portion 111 is disposed at the lower end of the electromagnet 11 , and a second connection portion 123 is disposed at the lower end of the first movable plate 12 . The first connection portion 111 is connected to the second connection portion 123 .

[0064] like Figure 2 and 5 As shown, in this embodiment, the lower end of the electromagnet 11 is provided with a first connecting portion 111 that moves up and down, and the lower end of the first movable plate 12 is provided with a second connecting portion 123 that matches the first connecting portion 111, and the first connecting portion 111 and the second connecting portion 123 are connected by bolts. The electromagnet 11 drives the first connecting portion 111 to move up and down, and the first connecting portion 111 drives the second connecting portion 123 to move up and down, so that the first movable plate 12 drives the first locking pin 241 to move up and down.

[0065] Locking steps: the first unit is fixed, the first limiting portion 271 abuts against the first locking pin 241, and the second unit moves in the first direction until the second locking pin 31 is engaged and locked with the second locking tongue 27. At this time, the first limiting portion 271 abuts against the limiting column 211, the limiting column 211 and the first locking pin 241 are respectively limited on both sides of the second locking tongue 27, and the pressing block 41 abuts against the first locking tongue 25;

[0066] Electric unlocking step: the electromagnet 11 drives the first movable plate 12 to move upward, the first movable plate 12 drives the first lock pin 241 to move upward, the second lock tongue 27 can rotate, and the second unit is driven to move in the second direction by external force so that the second lock pin 31 is disengaged from the second lock tongue 27 to unlock, and at this time, the first limiting portion 271 is in contact with the first lock pin 241;

[0067] Manual unlocking steps: manually pull the manual unlocking component 4 in the first direction so that the pressing block 41 presses the first lock tongue 25 in the first direction, and the first lock tongue 25 rotates to drive the first movable plate 12 to move upward, and the first movable plate 12 drives the first lock pin 241 to move upward. At this time, the second lock tongue 27 can rotate, and the second unit is driven by external force to move in the second direction so that the second lock pin 31 disengages from the second lock tongue 27 to unlock, and at this time, the first limiting portion 271 abuts against the first lock pin 241.

[0068] The first direction is left or right, and the second direction is the direction opposite to the first direction. Figure 1 As shown, in the present embodiment, because the electromagnetic lock is installed on the left sliding door, the first direction is leftward, and the second direction is rightward. If the electromagnetic lock is installed on the right sliding door, the first direction is rightward, and the second direction is leftward.

[0069] Another embodiment of the utility model provides a sliding door, comprising the mechanically retained electromagnetic lock as described above.

[0070] Although the disclosure is as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. A mechanically held electromagnetic lock, characterized in that: The invention comprises a first unit and a second unit, wherein the first unit comprises a first movable plate (12) and a connecting assembly (2) connected to each other, wherein the connecting assembly (2) comprises a mounting plate (21), wherein the mounting plate (21) is provided with a limiting column (211) and is hingedly connected with a first locking tongue (25) and a second locking tongue (27), wherein the first movable plate (12) is provided with a first locking pin (241) slidably connected to the mounting plate (21), wherein the first movable plate (12) is provided with a first limiting opening (121) suitable for movable connection with the first locking tongue (25), and wherein the second locking tongue (27) is provided with a bayonet (273); The second unit comprises a third movable plate (3) and a manual unlocking assembly (4) which are rotatably connected to each other, the third movable plate (3) is provided with a second locking pin (31), the second locking pin (31) is adapted to be matched with the bayonet (273), and the manual unlocking assembly (4) comprises a pressing block (41) movably connected to the third movable plate (3); When locking is required, the first unit and the second unit move closer to each other until the second lock pin (31) is inserted into the bayonet (273), the second lock tongue (27) rotates to abut against the limiting column (211), the first lock pin (241) moves downward and abuts against the second lock tongue (27) to achieve a mechanical holding function, and the first lock tongue (25) abuts against the pressing block (41) to complete the locking action; When manual unlocking is required, the pressing block (41) is driven to move, and the pressing block (41) pushes the first locking tongue (25) to rotate, and the first locking tongue (25) drives the first movable plate (12) to move upward, thereby driving the first locking pin (241) to move upward, so that the first locking pin (241) is disengaged from the second locking tongue (27), and the second unit is pulled away from the first unit, and the second locking pin (31) is disengaged from the bayonet (273), completing the unlocking action.

2. The mechanically held electromagnetic lock according to claim 1, characterized in that: The second locking tongue (27) comprises a first limiting portion (271). When unlocked, the first limiting portion (271) abuts against the first locking pin (241); when locked, two sides of the second locking tongue (27) abut against the limiting column (211) and the first locking pin (241) respectively.

3. The mechanically held electromagnetic lock according to claim 1, characterized in that: The connecting assembly (2) further comprises a connecting piece (26), one end of which is connected to the first locking tongue (25), and the other end of which is provided with a sliding block (261), and the sliding block (261) is slidably connected to the first limiting opening (121).

4. The mechanically held electromagnetic lock according to claim 1, characterized in that: The connecting assembly (2) further comprises a second movable plate (24) and a first fixed plate (22) fixed on the mounting plate (21); a through slide groove (221) is provided on the first fixed plate (22); the first locking pin (241) is passed through the second movable plate (24); a second limiting opening (212) matched with the first locking pin (241) is provided on the mounting plate (21); and the second movable plate (24) slides up and down in the slide groove (221).

5. The mechanically held electromagnetic lock according to claim 1, characterized in that: The connecting assembly (2) further comprises a second fixed plate (23) fixedly connected to the mounting plate (21); a limiting block (231) is provided on the second fixed plate (23); a third limiting opening (122) adapted to the limiting block (231) is provided on the first movable plate (12); the limiting block (231) is slidably connected to the third limiting opening (122) up and down.

6. The mechanically held electromagnetic lock according to claim 1, characterized in that: The manual unlocking assembly (4) comprises a fourth movable plate (42), the pressing block (41) is arranged on the fourth movable plate (42), and the fourth movable plate (42) is hinged to the third movable plate (3).

7. The mechanically held electromagnetic lock according to claim 6, characterized in that: The fourth movable plate (42) is provided with a pull block (43), the third movable plate (3) is provided with an escape opening (32), and the pull block (43) is slidably connected to the escape opening (32) leftward and rightward.

8. The mechanically held electromagnetic lock according to any one of claims 1 to 7, characterized in that: The first unit further comprises an electromagnetic assembly (1), wherein the electromagnetic assembly (1) comprises an electromagnet (11) for driving the first movable plate (12) to move up and down; when electric unlocking is required, the electromagnet (11) drives the first movable plate (12) to move up, thereby driving the first lock pin (241) to move up, so that the first lock pin (241) is disengaged from the second lock tongue (27), and the second lock pin (31) is disengaged from the bayonet (273), thereby completing the unlocking action.

9. The mechanically held electromagnetic lock according to claim 8, characterized in that: A first connecting portion (111) is provided at the lower end of the electromagnet (11), a second connecting portion (123) is provided at the lower end of the first movable plate (12), and the first connecting portion (111) is connected to the second connecting portion (123).

10. A sliding door, characterized in that: A mechanically retained electromagnetic lock comprising the mechanically retained electromagnetic lock as described in any one of claims 1-9.

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