Electromagnetic lock

Abstract

This utility model relates to the field of electromagnetic lock technology and discloses an electromagnetic lock, including a shell, a first connecting post, a first coil, a first iron core, a first elastic element, and a self-locking structure. The first connecting post is slidably mounted on the shell. The portion of the first connecting post extending outside the shell is used to cooperate with an external structure to achieve locking and unlocking of the electromagnetic lock. The first coil is disposed inside the shell. The first iron core is fixedly connected to the first connecting post and magnetically cooperates with the first coil. The first elastic element is disposed between the shell and the first connecting post. The self-locking structure is disposed inside the shell and has the functions of limiting and locking the first connecting post to a self-locking position when power is cut off once, and unlocking the first connecting post to an unlocking position when power is cut off again. The electromagnetic lock of this utility model can maintain the locked state after power failure, has high security, low energy consumption, and is easy to unlock.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic lock technology, specifically to electromagnetic locks. Background Technology

[0002] Traditional electromagnetic locks typically rely on electromagnetic force to maintain the locking state. Once the power is cut off, they lose their locking ability, posing a safety hazard, especially in the event of a power outage or sudden malfunction, which can easily cause the electromagnetic lock to fail.

[0003] In general, spring reset mechanisms or mechanical locking structures are used to solve the above problems. However, these structures often have problems such as complex structure, unreliable self-locking, high energy consumption, or inconvenient unlocking. Utility Model Content

[0004] In view of this, the present invention provides an electromagnetic lock to solve the problems of electromagnetic locks being unable to maintain a locked state after power failure, having low security, high energy consumption, and inconvenient unlocking.

[0005] This utility model provides an electromagnetic lock, comprising: shell; The first connecting post is slidably mounted on the outer casing; The first coil is disposed inside the housing; The first iron core is fixedly connected to the first connecting post and magnetically cooperates with the first coil; A first elastic element is disposed between the outer shell and the first connecting post; The self-locking structure is disposed inside the housing and has a self-locking position that limits and locks the first connecting post when a power failure occurs, and an unlocking position that unlocks the first connecting post when a power failure occurs again.

[0006] Beneficial effects: During the first power outage, the electromagnetic force generated by the first coil disappears, and the first iron core is no longer magnetically attracted. At this time, because the self-locking structure is in the self-locking position of limiting the first connecting post, the first connecting post will not move in the unlocking direction of the electromagnetic lock under the elastic force of the first elastic element. This ensures that the electromagnetic lock can still remain locked in the event of an accidental power outage, improving the security of the electromagnetic lock and reducing energy consumption. When power is restored after the first power outage, the first coil generates an electromagnetic force, and the first iron core is magnetically attracted by the electromagnetic force, limiting the movement of the first connecting post and keeping the electromagnetic lock in the locked state. During the second power outage, the electromagnetic force generated by the first coil disappears again, and the first iron core is no longer magnetically attracted. At this time, because the self-locking structure is in the unlocking position of the first connecting post, the first connecting post moves in the unlocking direction of the electromagnetic lock under the elastic force of the first elastic element, thereby realizing the normal unlocking operation of the electromagnetic lock and ensuring the convenience of unlocking the electromagnetic lock. Therefore, by setting a self-locking structure, the electromagnetic lock can remain locked during the first power outage, improving its security and reducing energy consumption; and it can also ensure that the electromagnetic lock can be unlocked normally during the next power outage, ensuring the ease of unlocking the electromagnetic lock.

[0007] In one optional implementation, the self-locking structure includes: A latch is rotatably disposed within the housing, and a limiting protrusion protrudes from the outer periphery of the latch; The retaining rib has one end fixedly connected to the first connecting post and the other end extending toward the latch; The limiting protrusion has a self-locking position for limiting and locking the stop rib, and an unlocking position that is offset from the stop rib.

[0008] Beneficial effects: The self-locking structure includes a latch and a stop rib. By controlling the rotation of the latch, the limiting protrusion and the stop rib can switch between a self-locking position with the limit locked and an unlocked position that is staggered. This allows the electromagnetic lock to self-lock during a power outage and unlock during another power outage. Furthermore, the design of the latch and stop rib simplifies the structure and facilitates control.

[0009] In one optional implementation, the self-locking structure further includes: The second connecting post is fixedly connected inside the housing and is spaced apart on one side of the first connecting post; Guide grooves are provided on the outer periphery of the second connecting column; The inner circumference of the latch has a protruding sliding engagement part, which is slidably connected to the guide groove.

[0010] Beneficial effects: The second connecting post can initially guide and limit the movement of the latch; the sliding connection between the guide groove and the sliding mating part can further guide and limit the movement of the latch, ensuring that the limiting protrusion can accurately switch between the unlocked position and the locked position.

[0011] In one optional implementation, the self-locking structure further includes: The second coil is sleeved on the outer periphery of the second connecting post; The second iron core is disposed on the latch and magnetically engages with the second coil. The second elastic element is connected between the latch and the second connecting post.

[0012] Beneficial effects: The second coil, second iron core, and second elastic element provide power for the movement of the latch, ensuring that the limiting protrusion on the latch can switch between the locked and unlocked positions. When the second coil is energized, it generates electromagnetic force, and the second iron core is attracted by this force, causing the latch to move. When the second coil is de-energized, the electromagnetic force disappears, and the second iron core moves under the elastic force of the second elastic element.

[0013] In one alternative embodiment, the second coil is spaced apart from the latch in the axial direction of the second connecting post; The guide groove includes: The first groove segment is arranged circumferentially along the second connecting post and extends downwardly along the axial direction of the second connecting post. The second groove segment is arranged circumferentially along the second connecting post and extends upwardly at an angle along the axial direction of the second connecting post; one end of the first groove segment is connected to one end of the second groove segment, and a first included angle is formed between the first groove segment and the second groove segment; The limiting protrusion forms a second included angle on its two sidewalls in the circumferential direction, and the angles of the first included angle and the second included angle are the same.

[0014] Beneficial effects: Because the first groove is arranged circumferentially along the second connecting post and extends downwardly along the axial direction of the second connecting post, the sliding engagement part rotates and moves downward simultaneously when moving within the first groove. Similarly, because the second groove is arranged circumferentially along the second connecting post and extends upwardly along the axial direction of the second connecting post, the sliding engagement part rotates and moves upward simultaneously when moving within the second groove. This movement of the sliding engagement part allows the limiting protrusion to switch between the unlocked and self-locking positions due to the rotation of the latch, and also ensures that the latch engages with the movement of the first connecting post in the axial direction without interfering with the normal movement of the first connecting post. The first and second included angles are consistent, ensuring accurate switching of the limiting protrusion between the self-locking and unlocking positions.

[0015] In one optional embodiment, the limiting protrusions include at least two that are evenly distributed along the circumference of the first connecting post, and the interval between two adjacent limiting protrusions forms a third included angle; the guide grooves are provided in at least two sets along the circumference of the second connecting post; wherein the angles of the first included angle, the second included angle, and the third included angle are the same.

[0016] Beneficial effects: The limiting protrusions have at least two evenly distributed ones, and the guide grooves are arranged in at least two sets in sequence. The angles of the first included angle, the second included angle and the third included angle are consistent, which can realize continuous rotation control of the latch, so that different limiting protrusions can alternately cooperate with the stop rib, and realize the switching of each limiting protrusion between the self-locking position and the unlocking position.

[0017] In one alternative implementation, the first included angle, the second included angle, and the third included angle are all 30°.

[0018] In one optional embodiment, at least two sets of guide grooves are sequentially provided along the circumference of the second connecting post, and the connection between adjacent sets of guide grooves is smoothly transitioned.

[0019] Beneficial effects: The smooth transition at the connection between two adjacent sets of guide grooves facilitates the transition of the sliding mating parts between the two sets of guide grooves and avoids sliding jamming of the sliding mating parts.

[0020] In one alternative implementation, the first groove segment and the second groove segment have a smooth transition.

[0021] Beneficial effects: The smooth transition between the first groove segment and the second groove segment facilitates the transition of the sliding mating part between the first groove segment and the second groove segment, and avoids the sliding mating part from sliding and getting stuck.

[0022] In one alternative implementation, the second coil is connected in series with the first coil.

[0023] Beneficial effects: The second coil is connected in series with the first coil, which can ensure synchronous movement between the latch and the first connecting post. This ensures accurate switching between the latch in the self-locking and unlocking positions, while also preventing the latch from interfering with other movements of the first connecting post.

[0024] In one alternative embodiment, the self-locking structure further includes a first stop block, which is fixedly connected to the outer periphery of the second connecting post and located between the second coil and the latch, and the second elastic element is connected between the latch and the first stop block.

[0025] Beneficial effect: The first stop can limit and fix the second elastic element, ensuring that the elastic force of the second elastic element can be smoothly applied to the lock.

[0026] In one alternative embodiment, the first coil is sleeved on the outer periphery of the first connecting post, and the first iron core is sleeved on the outer periphery of the first connecting post.

[0027] Beneficial effects: The first coil is sleeved on the outer periphery of the first connecting post, which can save space, simplify the structure, and facilitate the generation of a ring magnetic field to produce a more stable magnetic attraction force on the first iron core; The first iron core is sleeved on the outer periphery of the first connecting post, which can save space, simplify the structure, guide and limit the movement of the first iron core, and enhance the magnetic attraction effect with the first coil.

[0028] In one optional embodiment, the electromagnetic lock further includes a second stop block, which is fixedly connected to the outer periphery of the first connecting post, and the first elastic element is sleeved on the outer periphery of the first connecting post and connected between the second stop block and the outer shell.

[0029] Beneficial effect: The second stop can limit and fix the first elastic element, ensuring that the elastic force of the first elastic element can be smoothly applied to the first connecting column. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an electromagnetic lock (self-locking position) according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of an electromagnetic lock (unlocking position) according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of the latch of an electromagnetic lock according to an embodiment of the present utility model; Figure 4 This is another schematic diagram of the latch of an electromagnetic lock according to an embodiment of the present utility model; Figure 5 This is another schematic diagram of the latch of an electromagnetic lock according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of the latch and the second connecting post of an electromagnetic lock according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the second connecting post of an electromagnetic lock according to an embodiment of the present utility model; Figure 8 This is a schematic diagram of the unfolded guide groove of an electromagnetic lock according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures: 1. Outer shell; 2. First connecting post; 3. First coil; 4. First iron core; 5. First elastic element; 6. Self-locking structure; 61. Locking buckle; 611. Limiting protrusion; 612. Sliding mating part; 62. Retaining rib; 63. Second connecting post; 631. Assembly groove; 64. Guide slide groove; 641. First groove segment; 642. Second groove segment; 65. Second coil; 66. Second elastic element; 67. First stop block; 7. Second stop block; 8. Partition plate; 9. First winding frame; 10. Second winding frame. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0037] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0038] According to an embodiment of the present invention, an electromagnetic lock is provided, comprising a housing 1, a first connecting post 2, a first coil 3, a first iron core 4, a first elastic element 5, and a self-locking structure 6.

[0039] The first connecting post 2 is slidably inserted into the outer casing 1.

[0040] The portion of the first connecting post 2 that extends outside the outer casing 1 is used to cooperate with the external structure of the outer casing 1 to achieve locking and unlocking of the electromagnetic lock.

[0041] The first coil 3 is disposed inside the outer casing 1.

[0042] The first iron core 4 is fixedly connected to the first connecting post 2 and magnetically engages with the first coil 3.

[0043] The first elastic element 5 is disposed between the outer shell 1 and the first connecting post 2.

[0044] The self-locking structure 6 is disposed inside the housing 1, and has a self-locking position that limits and locks the first connecting post 2 when a power failure occurs, and an unlocking position that unlocks the first connecting post 2 when a power failure occurs again.

[0045] When power is first cut off, the electromagnetic force generated by the first coil 3 disappears, and the first iron core 4 is no longer attracted by the electromagnetic force. At this time, because the self-locking structure 6 is in the self-locking position of limiting and locking the first connecting post 2, the first connecting post 2 will not move in the unlocking direction of the electromagnetic lock under the elastic force of the first elastic element 5, ensuring that the electromagnetic lock can still maintain the locked state in the event of an accidental power failure, improving the security of the electromagnetic lock and reducing energy consumption. When power is restored after the first power failure, the first coil 3 generates an electromagnetic force, and the first iron core 4 is attracted by the electromagnetic force, limiting the movement of the first connecting post 2, so that the electromagnetic lock remains in the locked state. When power is cut off again, the electromagnetic force generated by the first coil 3 disappears again, and the first iron core 4 is no longer attracted by the electromagnetic force. At this time, because the self-locking structure 6 is in the unlocking position of unlocking the first connecting post 2, the first connecting post 2 moves in the unlocking direction of the electromagnetic lock under the elastic force of the first elastic element 5, thereby realizing the normal unlocking operation of the electromagnetic lock and ensuring the convenience of unlocking the electromagnetic lock. Therefore, by setting the self-locking structure 6, the electromagnetic lock can be kept in the locked state during the first power failure, improving the security of the electromagnetic lock and reducing energy consumption; and it can also ensure that the electromagnetic lock can be unlocked normally during the next power failure, ensuring the ease of unlocking the electromagnetic lock.

[0046] In this embodiment, magnetic attraction means that when the first coil 3 is energized and generates electromagnetic force, it can magnetically attract the first iron core 4; when the first coil 3 is de-energized, the first iron core 4 is no longer magnetically attracted.

[0047] In one embodiment, the self-locking structure 6 includes a latch 61 and a retaining rib.

[0048] The latch 61 is rotatably disposed inside the housing 1, and a limiting protrusion 611 protrudes from the outer periphery of the latch 61.

[0049] One end of the retaining rib 62 is fixedly connected to the first connecting post 2, and the other end extends toward the latch 61.

[0050] The limiting protrusion 611 has a self-locking position for limiting and locking the stop rib, and an unlocking position that is offset from the stop rib.

[0051] The self-locking structure 6 includes a latch 61 and a stop rib. By controlling the rotation of the latch 61, the limiting protrusion 611 and the stop rib can switch between a self-locking position with the limit locked and an unlocked position that is staggered from each other. This allows the electromagnetic lock to self-lock during a power outage and unlock during another power outage. Furthermore, the design of the latch 61 and the stop rib simplifies the structure and facilitates control.

[0052] In a specific implementation, when the limiting protrusion 611 is in the self-locking position, the limiting protrusion 611 can block the stop rib, thereby limiting the movement of the first connecting post 2 by the stop rib, preventing the first connecting post 2 from moving under the action of the first elastic member 5 and thus unlocking the electromagnetic lock.

[0053] In a specific implementation, when the limiting protrusion 611 is in the unlocked position, the limiting protrusion 611 can be offset from the stop rib, and the limiting protrusion 611 no longer limits or blocks the movement of the stop rib. The movement of the first connecting post 2 is unrestricted. At this time, the first connecting post 2 can move under the elastic force of the first elastic member 5, thereby unlocking the electromagnetic lock.

[0054] In one embodiment, the self-locking structure 6 further includes a second connecting post 63 and a guide groove 64.

[0055] The second connecting post 63 is fixedly connected inside the outer casing 1 and is spaced apart on one side of the first connecting post 2.

[0056] The guide groove 64 is disposed on the outer periphery of the second connecting post 63.

[0057] The inner circumference of the latch 61 is provided with a sliding engagement part 612, which is slidably connected to the guide groove 64.

[0058] The second connecting post 63 can initially guide and limit the movement of the latch 61; the sliding connection between the guide groove 64 and the sliding mating part 612 can further guide and limit the movement of the latch 61, ensuring that the limiting protrusion 611 can accurately switch between the unlocked position and the locked position.

[0059] As an alternative implementation, the latch 61 can also be rotatably connected to the housing 1 via a bearing.

[0060] As an alternative implementation, the guide groove 64 may be provided on the inner peripheral wall of the latch 61, and the outer peripheral of the second connecting post 63 may be provided with a sliding engagement part 612; the sliding engagement part 612 may be slidably connected to the guide groove 64.

[0061] In one embodiment, the self-locking structure 6 further includes a second coil 65, a second iron core, and a second elastic element 66.

[0062] The second coil 65 is sleeved on the outer periphery of the second connecting post 63.

[0063] The second iron core is mounted on the latch 61 and magnetically engages with the second coil 65.

[0064] The second elastic element 66 is connected between the latch 61 and the second connecting post 63.

[0065] The second coil 65, the second iron core, and the second elastic element 66 provide power for the movement of the latch 61, ensuring that the limiting protrusion 611 on the latch 61 can switch between the locked and unlocked positions. When the second coil 65 is energized, it generates an electromagnetic force, and the second iron core is attracted by the electromagnetic force, causing the latch 61 to move. When the second coil 65 is de-energized, the electromagnetic force generated by the second coil 65 disappears, and the second iron core moves under the elastic force of the second elastic element 66.

[0066] As an alternative implementation, a micro motor can be installed inside the outer casing 1 to control the rotation of the latch 61.

[0067] In one embodiment, the second coil 65 is spaced apart from the latch 61 in the axial direction of the second connecting post 63.

[0068] The guide groove 64 includes a first groove section 641 and a second groove section 642.

[0069] The first groove segment 641 is arranged circumferentially along the second connecting post 63 and extends downwardly along the axial direction of the second connecting post 63.

[0070] The second groove segment 642 is arranged circumferentially along the second connecting post 63 and extends upwardly along the axial direction of the second connecting post 63; one end of the first groove segment 641 is connected to one end of the second groove segment 642, and a first included angle is formed between the first groove segment 641 and the second groove segment 642.

[0071] The limiting protrusion 611 forms a second included angle on its two sidewalls in the circumferential direction, and the angles of the first included angle and the second included angle are the same.

[0072] Since the first groove segment 641 is arranged circumferentially along the second connecting post 63 and extends downwardly along the axial direction of the second connecting post 63, the sliding engagement part 612 rotates and moves downward simultaneously when moving within the first groove segment 641. Similarly, since the second groove segment 642 is arranged circumferentially along the second connecting post 63 and extends upwardly along the axial direction of the second connecting post 63, the sliding engagement part 612 rotates and moves upward simultaneously when moving within the second groove segment 642. This movement of the sliding engagement part 612 allows the locking protrusion 611 to switch between the unlocked and self-locking positions due to the rotation of the latch 61, and also allows the latch 61 to engage with the movement of the first connecting post 2 in the axial direction without interfering with the normal movement of the first connecting post 2. The first included angle and the second included angle are the same, ensuring accurate switching of the limiting protrusion 611 between the self-locking and unlocking positions.

[0073] In a further embodiment, the second connecting post 63 is also provided with an assembly groove 631. One end of the assembly groove 631 is connected to the guide slide groove 64, and the other end extends to the end of the second connecting post 63. The sliding engagement part 612 slides and engages with the guide slide groove 64 through the assembly groove 631, which facilitates the connection between the second connecting post 63 and the latch 61.

[0074] In one embodiment, the limiting protrusion 611 includes at least two that are evenly distributed along the circumference of the first connecting post 2, and the interval between two adjacent limiting protrusions 611 forms a third included angle; the guide groove 64 is provided with at least two sets along the circumference of the second connecting post 63; wherein the angles of the first included angle, the second included angle and the third included angle are the same.

[0075] The limiting protrusions 611 have at least two evenly distributed ones, and the guide grooves 64 are provided in at least two sets in sequence. The angles of the first included angle, the second included angle and the third included angle are the same, which can realize the continuous rotation control of the latch 61, so that different limiting protrusions 611 can alternately cooperate with the stop rib, and realize the switching of each limiting protrusion 611 between the self-locking position and the unlocking position.

[0076] In one embodiment, the first included angle, the second included angle, and the third included angle are all 30°.

[0077] The first, second, and third included angles are all 30°, which facilitates the control of the movement and rotation of the latch 61, and also facilitates the switching control of the limiting protrusion 611 between the self-locking and unlocking positions.

[0078] As an alternative implementation, the first included angle, the second included angle, and the third included angle can all be 20°; or, the first included angle, the second included angle, and the third included angle can all be 40°. Here, the actual angles of the first included angle, the second included angle, and the third included angle are not subject to excessive restrictions and can be set according to actual needs.

[0079] In one embodiment, at least two sets of guide grooves 64 are sequentially provided along the circumference of the second connecting post 63, and the connection between adjacent sets of guide grooves 64 is smoothly transitioned.

[0080] The smooth transition at the connection between two adjacent sets of guide grooves 64 facilitates the transition of the sliding mating part 612 between the two adjacent sets of guide grooves 64, and avoids the sliding mating part 612 from sliding and getting stuck.

[0081] In one embodiment, the first groove segment 641 and the second groove segment 642 have a smooth transition.

[0082] The smooth transition between the first groove segment 641 and the second groove segment 642 facilitates the transition of the sliding mating part 612 between the first groove segment 641 and the second groove segment 642, and prevents the sliding mating part 612 from sliding and getting stuck.

[0083] In one embodiment, the second coil 65 is connected in series with the first coil 3.

[0084] The second coil 65 is connected in series with the first coil 3, which can ensure that the latch 61 and the first connecting post 2 move synchronously. This ensures that the latch 61 can accurately switch between the self-locking position and the unlocking position, while also preventing the latch 61 from interfering with other movements of the first connecting post 2.

[0085] In one embodiment, the self-locking structure 6 further includes a first stop 67, which is fixedly connected to the outer periphery of the second connecting post 63 and located between the second coil 65 and the latch 61, and the second elastic member 66 is connected between the latch 61 and the first stop 67.

[0086] The first stop 67 can limit and fix the second elastic element 66, ensuring that the elastic force of the second elastic element 66 can be smoothly applied to the latch 61.

[0087] In a specific implementation, the first stop 67 is a flange structure that protrudes from the outer periphery of the second connecting post 63.

[0088] Alternatively, the first stop 67 may include at least two blocks spaced apart along the outer periphery of the second connecting post 63.

[0089] In one embodiment, the first coil 3 is sleeved on the outer periphery of the first connecting post 2, and the first iron core 4 is sleeved on the outer periphery of the first connecting post 2.

[0090] The first coil 3 is sleeved on the outer periphery of the first connecting post 2, which can save space, simplify the structure, and facilitate the generation of a ring magnetic field to produce a more stable magnetic attraction force on the first iron core 4. The first iron core 4 is sleeved on the outer periphery of the first connecting post 2, which can save space, simplify the structure, guide and limit the movement of the first iron core 4, and enhance the magnetic attraction effect with the first coil 3.

[0091] In one embodiment, the electromagnetic lock further includes a second stop 7, which is fixedly connected to the outer periphery of the first connecting post 2. The first elastic member 5 is sleeved on the outer periphery of the first connecting post 2 and connected between the second stop 7 and the outer shell 1.

[0092] The second stop 7 can limit and fix the first elastic element 5, ensuring that the elastic force of the first elastic element 5 can be smoothly applied to the first connecting post 2.

[0093] In a specific embodiment, the second stop 7 is a retaining ring.

[0094] In a further embodiment, the outer casing 1 is provided with a first through hole and a second through hole, and the two ends of the first connecting post 2 are respectively inserted through the first through hole and the second through hole; one end of the first connecting post 2 is provided with a second stop 7, and the other end cooperates with other components outside the outer casing 1 to realize the overall locking and unlocking of the electromagnetic lock; the first coil 3 is located at a position away from the second stop 7.

[0095] In a further embodiment, the outer casing 1 is further provided with a partition 8, which divides the inner cavity of the outer casing 1 into a first cavity and a second cavity. The first coil 3 and the second coil 65 are disposed in the first cavity, and the latch 61, the second elastic element 66, the first stop block 67, the stop rib, and the second iron core are all disposed in the second cavity. The partition 8 is provided with a first through hole and a second through hole; the first connecting post 2 passes through the first through hole, and the second connecting post 63 passes through the second through hole.

[0096] In a further embodiment, the outer casing 1 is further provided with a first winding frame 9 and a second winding frame 10. The first winding frame 9 is sleeved on the outer periphery of the first connecting post 2, and the first coil 3 is wound around the first winding frame 9. The second winding frame 10 is sleeved on the outer periphery of the second connecting post 63, and the second coil 65 is wound around the second winding frame 10.

[0097] In a specific implementation, the electromagnetic lock operates as follows: When energized, the first coil 3 generates electromagnetic force, and the first iron core 4, under the magnetic attraction of the electromagnetic force, compresses the first elastic element 5 and moves downward, achieving the locking state of the electromagnetic lock; simultaneously, the second coil 65 also generates electromagnetic force, and the latch 61, under the magnetic attraction of the electromagnetic force, compresses the second elastic element 66 and moves downward, the sliding engagement part 612 rotates downward along the first groove segment 641, the latch 61 rotates downward, the limiting protrusion 611 follows the movement and remains in the self-locking position abutting against the stop rib limit. When the power is de-energized for the first time, the electromagnetic force generated by the first coil 3 disappears, and the first iron core 4 is no longer subject to the magnetic attraction of the electromagnetic force; the electromagnetic force generated by the second coil 65 disappears, the latch 61 rotates upward under the elastic force of the second elastic element 66, the sliding engagement part 612 rotates upward along the second groove segment 642, at this time, the limiting protrusion 611 follows the movement and remains in the self-locking position abutting against the stop rib limit, and the first connecting post 2 will not move in the unlocking direction of the electromagnetic lock under the elastic force of the first elastic element 5. When power is restored, the first coil 3 and the second coil 65 generate electromagnetic force again. The first iron core 4 is attracted by the electromagnetic force, limiting the movement of the first connecting post 2, thus keeping the electromagnetic lock locked. The second iron core on the latch 61 rotates downward under the magnetic attraction of the electromagnetic force, and the sliding engagement part 612 rotates downward along the first groove segment 641 of the next set of limiting slides. The limiting protrusion 611 and the stop rib are misaligned, and the limiting protrusion 611 reaches the unlocked position. When power is de-energized again, the electromagnetic force generated by the first coil 3 and the second coil 65 disappears. Since the limiting protrusion 611 is in the unlocked position, the first iron core 4 is no longer restricted by the limiting protrusion 611 and moves upward under the elastic force of the first elastic member 5, thus unlocking the electromagnetic lock. At this time, the latch 61 rotates upward under the elastic force of the second elastic member 66, and the sliding engagement part 612 rotates upward along the second groove segment 642, causing the limiting protrusion 611 to move towards the self-locking position until the next time power is restored, at which point the limiting protrusion 611 can return to the self-locking position.

[0098] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An electromagnetic lock, characterized in that, include: Outer shell (1); The first connecting post (2) is slidably mounted on the outer shell (1); The first coil (3) is disposed inside the outer casing (1); The first iron core (4) is fixedly connected to the first connecting post (2) and magnetically cooperates with the first coil (3); A first elastic element (5) is disposed between the outer shell (1) and the first connecting post (2); A self-locking structure (6) is provided inside the housing (1), having a self-locking position that limits and locks the first connecting post (2) when power is cut off once, and an unlocking position that unlocks the first connecting post (2) when power is cut off again.

2. The electromagnetic lock according to claim 1, characterized in that, The self-locking structure (6) includes: The latch (61) is rotatably disposed inside the outer casing (1), and the outer periphery of the latch (61) is provided with a limiting protrusion (611). The retaining rib (62) is fixedly connected at one end to the first connecting post (2) and extends towards the latch (61) at the other end; The limiting protrusion (611) has a self-locking position for limiting and locking the stop rib (62), and an unlocking position that is offset from the stop rib.

3. The electromagnetic lock according to claim 2, characterized in that, The self-locking structure (6) also includes: The second connecting post (63) is fixedly connected inside the outer casing (1) and is spaced apart on one side of the first connecting post (2); A guide groove (64) is provided on the outer periphery of the second connecting post (63); The inner circumference of the latch (61) is provided with a sliding engagement part (612), which is slidably connected to the guide groove (64).

4. The electromagnetic lock according to claim 3, characterized in that, The self-locking structure (6) also includes: The second coil (65) is sleeved on the outer periphery of the second connecting post (63); The second iron core is disposed on the latch (61) and magnetically engages with the second coil (65); The second elastic element (66) is connected between the latch (61) and the second connecting post (63).

5. The electromagnetic lock according to claim 4, characterized in that, In the axial direction of the second connecting post (63), the second coil (65) is spaced apart from the latch (61); The guide groove (64) includes: The first groove segment (641) is arranged circumferentially along the second connecting post (63) and extends downwardly along the axial direction of the second connecting post (63); The second groove segment (642) is arranged circumferentially along the second connecting post (63) and extends upwardly along the axial direction of the second connecting post (63); one end of the first groove segment (641) is connected to one end of the second groove segment (642), and a first included angle is formed between the first groove segment (641) and the second groove segment (642); The limiting protrusion (611) forms a second included angle on the two sidewalls in the circumferential direction, and the angle of the first included angle is the same as that of the second included angle.

6. The electromagnetic lock according to claim 5, characterized in that, The limiting protrusion (611) includes at least two that are evenly distributed along the circumference of the first connecting post (2), and the interval between two adjacent limiting protrusions (611) forms a third included angle; the guide groove (64) is provided with at least two sets along the circumference of the second connecting post (63); wherein the angles of the first included angle, the second included angle and the third included angle are the same.

7. The electromagnetic lock according to claim 6, characterized in that, The first included angle, the second included angle, and the third included angle are all 30°; And / or, the connection between two adjacent sets of guide grooves (64) is smoothly transitioned.

8. The electromagnetic lock according to claim 5, characterized in that, The first groove segment (641) and the second groove segment (642) have a smooth transition.

9. The electromagnetic lock according to any one of claims 4 to 7, characterized in that, The second coil (65) is connected in series with the first coil (3); And / or, the self-locking structure (6) further includes a first stop (67), which is fixedly connected to the outer periphery of the second connecting post (63) and located between the second coil (65) and the latch (61), and the second elastic member (66) is connected between the latch (61) and the first stop (67).

10. The electromagnetic lock according to any one of claims 1 to 7, characterized in that, The first coil (3) is sleeved on the outer periphery of the first connecting post (2), and the first iron core (4) is sleeved on the outer periphery of the first connecting post (2); And / or, the electromagnetic lock further includes a second stop (7), which is fixedly connected to the outer periphery of the first connecting post (2), and the first elastic element (5) is sleeved on the outer periphery of the first connecting post (2) and connected between the second stop (7) and the outer shell (1).

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