Platform door electromagnetic lock and electromagnetic lock system

Abstract

The present invention relates to the technical field of electromagnetic locks, and in particular to an electromagnetic lock for platform doors and an electromagnetic lock system for platform doors. By adopting the redundant setting of a double-stroke switch, the locking and locking signals of the movable plate of the electromagnetic lock are accurately and reliably transmitted to the control system, thereby improving the reliability of the overall function of the platform door. At the same time, the stroke switch directly detects the movement of the movable plate, which is more direct and reliable, rather than indirectly reflecting the movement of the movable plate by detecting the electromagnet's attraction action, thus meeting the SIL4 safety level certification under the vehicle's fully automatic operation mode. At the same time, an anti-collision buffer column is added to ensure that the lock hook will not be deformed or broken due to over-stroke. The movable plate and the lock hook contact plate form an annular closed space structure to ensure that the lock hook will not fall off the lock plate under any extreme circumstances. A detection module is added to the platform door electromagnetic lock system to predict the working status of the electromagnetic lock through the contact signal synchronization time, thereby facilitating maintenance and repair and reducing the failure rate.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic locks, and in particular to an electromagnetic lock for a platform door and an electromagnetic lock system. Background Art

[0002] The electromagnetic lock for rail transit platform doors is a core component of the platform door system, consisting of an electromagnet, locking mechanism, buffer mechanism, position sensor, and manual unlocking mechanism. These locks must fulfill numerous functions and possess a complex structure, placing extremely high demands on service life, frequency of use, and reliability. Research on electromagnetic locks for platform doors is a key research area for platform door structures. Furthermore, with the increasing adoption of fully automated driving technology for rail transit vehicles, the demand for linkage between platform doors and vehicles is increasing. Improving the structural reliability of electromagnetic locks for platform doors and implementing relevant redundant designs to ensure accurate and timely transmission of the locking signal to the signaling system are also key research areas for electromagnetic locks for platform doors.

[0003] Traditional platform door electromagnetic locks are overly simple, have a single function, and lack redundant design. They can only lock the sliding door by hooking the moving lock hook. The lack of an over-travel protection device makes the sliding door lock hook easily bent or deformed, resulting in a failure to automatically lock the sliding door. Furthermore, the position sensor of traditional platform door electromagnetic locks can only detect the travel position of the electromagnet, lacking redundant detection, and is unable to detect the travel position of the movable plate. When the pin connecting the electromagnet and the lock plate falls off, the electromagnet functions normally, the position sensor also detects normally, but the actual lock plate does not move. This can cause the sliding door to not actually be locked, but the signal system has already received the signal that the sliding door is locked, creating a significant safety hazard. Summary of the Invention

[0004] The present invention provides an electromagnetic lock for a platform door, which solves the technical problems of the existing electromagnetic lock, such as overly simple structure, single function, no redundant structural design, and great potential safety hazards, thereby improving the safety, reliability and service life of the electromagnetic lock.

[0005] To solve the above technical problems, an embodiment of the present invention provides an electromagnetic lock for a platform door, the electromagnetic lock comprising: an electromagnet, a fixed plate, a movable plate, a left lock plate, and a right lock plate;

[0006] The electromagnet is fixed on the fixed plate, and the core of the electromagnet is connected to the movable plate through a pin; a buffer column and a travel switch are respectively provided on the left and right sides of the fixed plate;

[0007] The lower part of the travel switch is connected to a rocker, one end of which is rotatably connected to the travel switch, and the other end of which is provided with a pulley, which is slidably connected to a travel switch trigger plate provided on the upper part of the movable plate;

[0008] A first fixed slide groove and a second fixed slide groove are provided on the center line of the movable plate, and the movable plate slides up and down within the vertical range limited by the first fixed slide groove and the second fixed slide groove through the guide shaft and the rotating shaft provided on the upper and lower sides of the fixed plate;

[0009] The left lock plate and the right lock plate are respectively fixedly mounted with a left lock hook and a right lock hook. The left lock plate is mounted on the left sliding door hanging wheel plate to move with the left sliding door; the right lock plate is mounted on the right sliding door hanging wheel plate to move with the right sliding door.

[0010] In a further embodiment, it further comprises a lock hook contact plate mounted on the rotating shaft, and a limit column arranged on the movable plate;

[0011] The lock hook contact plate is between the movable plate and the fixed plate and moves in an arc with the rotating shaft as the center; a groove is provided on the lock hook contact plate to limit the movement of the lock hook;

[0012] The limiting column abuts against the lock hook and the plate when locking.

[0013] In a further embodiment, there are two locking hook contact plates, which are distributed on the left and right sides of the rotating shaft, and the two locking hook contact plates are separated by a nylon gasket with a low friction coefficient;

[0014] There are two limiting columns, which are respectively arranged on the left and right sides of the movable plate.

[0015] In a further embodiment, the two locking hook contact plates respectively form an annular closed space with the movable plate to restrict the left locking hook and the right locking hook within the space and prevent them from moving up and down or left and right.

[0016] In a further embodiment, a manual unlocking trigger plate is provided at the lower portion of the movable plate.

[0017] In a further embodiment, the buffer column is a movable telescopic structure.

[0018] In a further embodiment, the fixed plate, movable plate, left lock plate, left lock hook, right lock plate, right lock hook and lock hook contact plate are all high-strength wear-resistant stainless steel parts.

[0019] In the second aspect, an embodiment of the present invention provides a platform door electromagnetic lock system, which includes the platform door electromagnetic lock described in any one of the above items, and also includes a control system and a signal system. When the sliding door needs to be opened, the signal system sends an unlocking signal to the control system, and the control system sends an energizing and attracting signal to the electromagnet. The electromagnet is energized and attracted, driving the movable plate to move upward, thereby releasing the limit on the left lock hook and the right lock hook.

[0020] In a further embodiment of the second aspect, the control system collects the connection or disconnection time of the left travel switch and the right travel switch, calculates the connection or disconnection time difference between the left travel switch and the right travel switch, and obtains the synchronization time difference of the travel switch contact signals.

[0021] In a further embodiment of the second aspect, the system also includes a detection module, which receives the travel switch contact signal synchronization time difference obtained by the control system, judges the working state of the electromagnetic lock based on the travel switch contact signal synchronization time difference, and when the contact signal time difference reaches a threshold, determines that the current mechanical resistance of the electromagnetic lock has increased, and issues a warning signal.

[0022] The present invention provides an electromagnetic lock and an electromagnetic lock system for platform doors, which addresses the technical problems of existing electromagnetic locks that are too simple in structure, single in function, without redundant structural design, and have major safety hazards. By adopting the redundant setting of the double-stroke switch, the locking and locking signals of the movable plate of the electromagnetic lock are accurately and reliably transmitted to the control system, thereby improving the reliability of the overall function of the platform door. At the same time, the stroke switch directly detects the movement of the movable plate, which is more direct and reliable, rather than indirectly reflecting the movement of the movable plate by detecting the electromagnet's attraction action, thus meeting the SIL4 safety level certification under the vehicle's fully automatic operation mode. At the same time, an anti-collision buffer column is added to ensure that the lock hook will not be deformed or broken due to over-stroke. The movable plate and the lock hook contact plate form an annular closed space structure to ensure that the lock hook will not fall off the lock plate under any extreme circumstances. A detection module is added to the platform door electromagnetic lock system to predict the working status of the electromagnetic lock through the contact signal synchronization time, thereby facilitating maintenance and repair and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of an electromagnetic lock for a platform door according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the main structure of an electromagnetic lock for a platform door according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of a movable plate of an electromagnetic lock for a platform door according to an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the enclosed space formed by the movable plate and the left lock hook contact plate of a platform door electromagnetic lock according to an embodiment of the present invention;

[0027] Figure 5 It is a structural schematic diagram of an electromagnetic lock system for platform doors in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present invention in detail with reference to the accompanying drawings. The embodiments are provided for illustrative purposes only and are not to be construed as limiting the present invention. The accompanying drawings are provided for reference and illustration purposes only and do not constitute a limitation on the scope of protection of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0029] Please refer to Figure 1 、 Figure 2 、 Figure 3 In an embodiment of the present invention, a platform door electromagnetic lock is provided, including: an electromagnet 9, a fixed plate 10, a movable plate 4, a left lock plate 2, and a right lock plate 6.

[0030] The electromagnet 9 is fixed on the fixed plate 10 , and the core of the electromagnet 9 is connected to the movable plate 4 via a pin 20 ; a buffer column 7 and a travel switch 1 are respectively provided on the left and right sides of the fixed plate 10 .

[0031] The lower part of the travel switch 1 is connected to a rocker 8, one end of which is rotatably connected to the travel switch, and the other end of which is mounted with a pulley 17, which is slidably connected to a travel switch trigger plate 16 provided on the upper part of the movable plate 4;

[0032] A first fixed slot 18 and a second fixed slot 19 are formed on the center line of the movable panel 4. The movable panel 4 slides up and down within the vertical range limited by the first fixed slot 18 and the second fixed slot 19 via a guide shaft 21 and a rotating shaft 22 provided on the fixed panel 10. A manual unlocking trigger plate 15 is provided at the lower portion of the movable panel 4.

[0033] The left lock plate 2 and the right lock plate 6 are respectively fixed with a left lock hook 3 and a right lock hook 5. The left lock plate 2 is installed on the left sliding door hanging wheel plate to move with the left sliding door; the right lock plate 6 is installed on the right sliding door hanging wheel plate to move with the right sliding door.

[0034] In this embodiment, if Figure 2As shown, the platform door electromagnetic lock also includes a hook plate mounted on the rotating shaft 22 and a limit post disposed on the movable plate. There are two hook plates and limit posts, each consisting of a left hook plate 11 and a right hook plate 12, and a left limit post 13 and a right limit post 14. The left hook plate 11 and the right hook plate 12 are both disposed between the movable plate 4 and the fixed plate 10. One end of the left hook plate 11 and the right hook plate 12 are rotatably connected to the rotating shaft 22, allowing them to move in an arc about the rotating shaft 22. A low-friction nylon gasket separates the left and right hook plates 11 and 12. Grooves are provided on each of the left and right hook plates 11 and 12 to limit the movement of the left and right hooks 3 and 5. The left limit post 13 and the right limit post 14 are disposed on the left and right sides of the movable plate 5, respectively, and abut against the hook plates when the lock is released to limit their movement.

[0035] In the embodiment of the invention, by energizing and de-energizing the electromagnet 9, the movable plate 4 is driven to move up and down within the vertical range limited by the first fixing slot 18 and the second fixing slot 19, thereby realizing the electromagnetic lock lifting and locking actions.

[0036] During the electromagnetic lock closing process, the motor drives the belt to move, on which the left and right sliding door hanging plates are fixed. Taking the locking of the left sliding door hanging plate as an example, when the left lock plate 2 and the left lock hook 3 move with the left sliding door hanging plate to the position of the movable plate 4, the left lock hook 3 contacts the inclined surface on the left side of the movable plate 4, causing the movable plate 4 to move upward along the axis formed by the first fixed groove 18 and the second fixed groove 19. The left limit post 13 also moves upward with the movable plate, causing the left lock hook to touch the plate 11 to move in a counterclockwise arc with the rotation axis as the center, ensuring that the left lock hook 3 can smoothly enter the groove of the left lock hook touch plate 11. When the left lock hook 3 further moves to the top of the inclined surface on the left side of the movable plate 4, the left lock hook 3 disengages from the inclined surface on the left side of the movable plate 4, and the movable plate 4 moves downward under the action of gravity and returns to its initial position. The left lock hook plate 11 also moves in a clockwise arc with the rotation axis as the center under the action of the left limit column 13 and is fixed between the left limit column 13 and the guide shaft 21. At this time, the left lock hook 3 is confined in the closed space formed by the movable plate 4 and the left lock hook plate 11 (as shown in FIG. Figure 4 The left sliding door hanger plate (shown in the triangle area) cannot move up or down or left or right. This prevents the risk of the left locking hook 3 being disengaged due to a reduction in the external force applied to the left sliding door hanger plate, ensuring that the sliding door can be locked in any state. The locking process for the right sliding door hanger plate is the same as that for the left sliding door hanger plate, but the movement direction is opposite.

[0037] During the electromagnetic lock unlocking process, when the sliding door needs to be opened, the electromagnet 9 receives the power-on attraction signal and is energized and attracted, driving the movable plate 4 to move upward. When the movable plate 4 moves to the top, the limit of the left lock hook 3 and the right lock hook 5 is released and can move freely. The sliding door can be opened by driving the motor or manually pushing and pulling the sliding door.

[0038] During the manual unlocking process of the electromagnetic lock, the push rod is pushed upward through the manual unlocking handle in the sliding door frame, and the push rod is connected to the manual unlocking trigger plate 15 set at the lower end of the movable plate 4, so that the movable plate 4 also moves upward, achieving the purpose of unlocking, so that the sliding door can be manually pushed open.

[0039] In this embodiment of the present invention, a travel switch 1 is disposed on each side of the fixed plate 10. Travel switches 1 are triggered by a travel switch trigger plate 16 disposed on the upper portion of the movable plate 4. A rocker 8 is connected to the lower portion of the travel switch 1. One end of the rocker 8 is rotatably connected to the lower portion of the travel switch 1, and the other end of the rocker is mounted with a pulley 17, which is slidably connected to the travel switch trigger plate 16 disposed on the upper portion of the movable plate 4. When unlocking, the movable plate 4 moves upward, causing pulley 17 to move inward on the travel switch trigger plate 16, which triggers the travel switch 1 to turn on and off. When locking, the movable plate 4 moves upward and then downward, causing pulley 17 to move inward and then outward on the travel switch trigger plate 16, which triggers the travel switch 1 to turn on and off.

[0040] The electromagnetic lock adopts a redundant design structure, with two travel switches installed to detect whether the lock is lifted or lowered. This ensures that even if one travel switch fails, the signal can still be transmitted to the control system. This improves the overall reliability of the platform door function. The position sensor used in traditional platform door electromagnetic locks can only detect the travel position of the electromagnet, but cannot detect the travel position of the movable plate. When the pin connecting the electromagnet and the movable plate falls off, the electromagnet functions normally and the position sensor also detects normally, but the movable plate does not actually move. As a result, the sliding door is not actually locked, but the signal system still receives the signal that the sliding door is locked, creating a major safety hazard. At the same time, the travel switch directly detects the movement of the movable plate, which is more direct and reliable, rather than indirectly reflecting the movement of the movable plate by detecting the electromagnet's attraction. It meets the SIL4 safety level certification for the fully automatic operation mode of subway vehicles.

[0041] In this embodiment of the present invention, buffer columns 7 are installed on both sides of the fixed plate 10. These columns are retractable and extend to an adjustable length. The heads of these columns are made of soft nylon, effectively absorbing the impact of the sliding door's pulley plate. The impact force generated by the sliding door's movement is offset by the buffer columns 7, protecting the left and right lock hooks 3 and 5 from deformation or breakage due to the impact. This prevents the platform door electromagnetic lock from failing to automatically lock the sliding door, further improving the overall lifespan and reliability of the electromagnetic lock.

[0042] In an embodiment of the present invention, moving parts such as the left lock plate 2, the left lock hook 3, the right lock plate 6, the right lock hook 5, the movable plate 4, the fixed plate 10, the left lock hook contact plate 11 and the right lock hook contact plate 12 are all made of high-strength wear-resistant stainless steel, which meets the rigidity and strength requirements of the electromagnetic lock while improving the anti-corrosion and rust-proof performance and wear resistance of the electromagnetic lock. The dimensional accuracy of the structure is maintained for a longer time, which can meet the requirements of maintaining normal operation under harsh working conditions in the rail transit industry, further improving the reliability and durability of the platform door electromagnetic lock.

[0043] In summary, the platform door electromagnetic lock provided in the embodiment of the present invention, by adopting the redundant setting of the double-stroke switch, can accurately and reliably transmit the locking and locking signals of the electromagnetic lock movable plate to the control system, thereby improving the reliability of the overall function of the platform door. At the same time, the stroke switch directly detects the movement of the movable plate, which is more direct and reliable, rather than indirectly reflecting the movement of the movable plate by detecting the electromagnet's attraction action. It meets the SIL4 safety level certification under the vehicle's fully automatic operation mode. At the same time, an anti-collision buffer column is added to ensure that the lock hook will not be deformed or broken due to over-travel. The movable plate and the lock hook contact plate form an annular closed space structure to ensure that the lock hook will not fall out of the lock plate under any extreme circumstances.

[0044] Based on a platform door electromagnetic lock in an embodiment of the present invention, a platform door electromagnetic lock system is also provided, such as Figure 5 As shown, the system includes the platform door electromagnetic lock 103 mentioned above, and also includes a control system 102 and a signal system 101. When the sliding door needs to be opened, the signal system 101 sends an unlocking signal to the control system 102, and the control system 102 sends an energizing and attracting signal to the electromagnet. The electromagnet is energized and attracted, driving the movable plate to move upward. When the movable plate moves to the top, the limit of the left lock hook and the right lock hook is released and can move freely. The sliding door can be driven by a motor or manually pushed and pulled, so that the sliding door is opened and the limit of the left lock hook and the right lock hook is released.

[0045] The time difference between the left and right travel switches when they are connected or disconnected is the time difference between the travel switch contact signals. The control system 102 collects the time when the left and right travel switches are connected or disconnected, and calculates the time difference between the left and right travel switches when they are connected or disconnected to obtain the time difference between the travel switch contact signals.

[0046] In an embodiment of the present invention, the system further includes a detection module 104. The control system 102 transmits the obtained time difference of the travel switch contact signal synchronization to the detection module 104. The detection module 104 determines the operating status of the electromagnetic lock 103 by analyzing the time difference of the travel switch contact signal synchronization. A contact signal time difference threshold can be set. When the contact signal time difference reaches the threshold, it indicates that the synchronization between the left and right travel switches has deteriorated, and it is determined that the current mechanical resistance of the electromagnetic lock 103 has increased, and an early warning signal is issued. The detection module 104 can quickly determine which travel switch is stuck or not operating, facilitating maintenance and repair and reducing the failure rate.

[0047] In an embodiment of the present invention, an electromagnetic lock and system for platform doors are provided to address the technical issues of conventional electromagnetic locks, which suffer from oversimplified structures, single functions, lack of redundant structures, lack of overtravel protection devices, and inability to detect the travel position of the movable plate. By employing a redundant dual-travel switch configuration, the electromagnetic lock's movable plate's locking and closing signals are accurately and reliably transmitted to the control system, improving the overall reliability of the platform door. Furthermore, the travel switch directly detects the movable plate's movement, providing a more direct and reliable detection method, rather than indirectly detecting the plate's movement by detecting the electromagnet's engagement. This system meets the SIL4 safety level certification for fully automatic vehicle operation. A collision prevention column is also added to prevent the locking hook from being deformed or broken by overtravel. The movable plate and the lock hook contact plate form a closed annular structure, ensuring that the lock hook will not disengage from the lock plate under any extreme circumstances. A detection module is added to the platform door electromagnetic lock system to predict the electromagnetic lock's operating status based on the timing of contact signal synchronization, facilitating maintenance and reducing failure rates.

[0048] The above-described embodiments merely represent several preferred implementations of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art could make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the scope of protection of the claims.

Claims

1. A platform door electromagnetic lock, characterized in that: include: Electromagnet, fixed plate, movable plate, left locking plate, right locking plate; The electromagnet is fixed on the fixed plate, and the core of the electromagnet is connected to the movable plate through a pin; a buffer column and a travel switch are respectively provided on the left and right sides of the fixed plate; The lower part of the travel switch is connected to a rocker, one end of which is rotatably connected to the travel switch, and the other end of which is provided with a pulley, which is slidably connected to a travel switch trigger plate provided on the upper part of the movable plate; A first fixed slide groove and a second fixed slide groove are provided on the center line of the movable plate, and the movable plate slides up and down within the vertical range limited by the first fixed slide groove and the second fixed slide groove through the guide shaft and the rotating shaft provided on the upper and lower sides of the fixed plate; The left lock plate and the right lock plate are respectively fixedly mounted with a left lock hook and a right lock hook, the left lock plate is mounted on the left sliding door hanging wheel plate to move with the left sliding door; the right lock plate is mounted on the right sliding door hanging wheel plate to move with the right sliding door; The left lock hook and the right lock hook are both cylindrical; It also includes a lock hook contact plate installed on the rotating shaft, and a limit column arranged on the movable plate; The two locking hook contact plates respectively form an annular closed space with the movable plate to restrict the left locking hook and the right locking hook from moving up and down or left and right within the space; The lock hook contact plate is between the movable plate and the fixed plate and moves in an arc with the rotating shaft as the center; a groove is provided on the lock hook contact plate to limit the movement of the lock hook; The limiting column abuts against the lock hook and the plate when locking.

2. The platform door electromagnetic lock according to claim 1, characterized in that: There are two lock hook contact plates, which are distributed on the left and right sides of the rotating shaft, and the two lock hook contact plates are separated by a nylon gasket with a low friction coefficient; There are two limiting columns, which are respectively arranged on the left and right sides of the movable plate.

3. The platform door electromagnetic lock according to claim 1, characterized in that: A manual unlocking trigger plate is provided at the lower part of the movable plate.

4. The platform door electromagnetic lock according to claim 1, wherein: The buffer column is a movable telescopic structure.

5. The platform door electromagnetic lock according to claim 1, wherein: The fixed plate, movable plate, left locking plate, left locking hook, right locking plate, right locking hook and locking hook contact plate are all high-strength wear-resistant stainless steel parts.

6. A platform door electromagnetic lock system, characterized in that: The system includes the platform door electromagnetic lock according to any one of claims 1 to 5, and also includes a control system and a signal system. When the sliding door needs to be opened, the signal system sends an unlocking signal to the control system, and the control system sends an energizing and absorbing signal to the electromagnet. The electromagnet is energized and absorbing, driving the movable plate to move upward, thereby releasing the limit on the left lock hook and the right lock hook.

7. The platform door electromagnetic lock system according to claim 6, characterized in that: The control system collects the on or off time of the left travel switch and the right travel switch, calculates the on or off time difference between the left travel switch and the right travel switch, and obtains the travel switch contact signal synchronization time difference.

8. The platform door electromagnetic lock system according to claim 7, characterized in that: The system also includes a detection module, which receives the travel switch contact signal synchronization time difference obtained by the control system, and determines the working status of the electromagnetic lock based on the travel switch contact signal synchronization time difference. When the contact signal synchronization time difference reaches a threshold, it is determined that the current mechanical resistance of the electromagnetic lock has increased, and an early warning signal is issued.

Images