Electromagnetic drive stop lock device

Abstract

The invention discloses an electromagnetic drive stop lock device. The device mainly comprises a rack, an L-shaped blocking lug, a buffer pad, a rotary electromagnet, a lap joint rocker arm, a sector part, an electromagnetic safety pin and a signal switch. The vertical part of the baffle lug is provided with a buffer pad for limiting the container, and the horizontal part of the baffle lug is in lap joint with a roller on the lap joint rocker arm; the lap joint rocker arm is hinged to a fan-shaped piece through a connecting piece, and the fan-shaped piece makes contact with an arc-shaped boss of the rotating electromagnet. The rotating electromagnet can drive the fan-shaped piece to move after being powered on, then the blocking lug is driven to rotate through the connecting piece and the lap joint rocker arm, and rapid unlocking of the container is achieved. The device is further provided with a limiting block, an unlocking and locking signal switch and an electromagnetic safety pin, and the limiting reliability and safety are improved. The device is compact in structure, high in response speed, high in bearing capacity and suitable for reliable cargo box limiting and signal control launching of the freight unmanned aerial vehicle in the vibration environment.

Description

Technical Field

[0001] This application relates to the field of cargo container fixing and deployment technology, and more specifically, to an electromagnetically driven motion-limiting lock device. Background Technology

[0002] Medium and large-sized drones are increasingly used in cargo transportation and precision airdrop missions. When performing such missions, reliable cargo containment within the drone's cabin and rapid unlocking upon receiving a drop command in the air are crucial for ensuring mission success and equipment safety. Therefore, cargo drones need to be equipped with a motion-limiting lock device that can securely lock the cargo container during transport and respond quickly during drop.

[0003] Currently, most common cargo box movement limit locks in the industry use electric motors as the drive source, with the motor driving a screw, gear, or linkage mechanism to achieve locking and unlocking functions. While this type of motor-driven solution can meet basic movement restriction and unlocking requirements, it also has significant limitations: First, motor-driven systems are usually complex in structure and have many components, resulting in a large overall weight, which is not conducive to the lightweight design of drones; second, there is a certain response delay in the motor start-up and transmission process, resulting in a long actuation time, making it difficult to meet the requirements of rapid deployment in high-dynamic environments; in addition, limited by the motor output torque and the strength of the transmission mechanism, the load-bearing capacity of this type of movement limit lock is limited, making it difficult to meet the fixing requirements of large-weight cargo boxes; finally, motor-driven systems are expensive, and their reliability under harsh conditions such as vibration and impact still needs to be improved.

[0004] Therefore, it is necessary to propose a new drive and transmission scheme to address the shortcomings of existing motor-driven motion-limiting locks in terms of response speed, load-bearing capacity, weight, and reliability, so as to meet the comprehensive requirements of cargo drones for motion-limiting lock devices that are fast, reliable, lightweight, and have high load capacity. Summary of the Invention

[0005] The purpose of this application is to overcome the shortcomings of existing technologies and provide an electromagnetically driven limiting lock device, which has the advantages of simple structure, high reliability, large load, fast response, light weight and low cost.

[0006] The objective of this application is achieved through the following technical solution:

[0007] In the first aspect, this application proposes an electromagnetically driven limiting lock device, including a frame 3, a stop ear 1, a buffer pad 5, a rotating shaft 2, an unlocking signal switch 4, a limiting block 6, a roller 7, a locking signal switch 8, a connecting rocker arm 9, an electromagnetic safety pin 11, a connecting piece 12, a sector-shaped part 13, and a rotating electromagnet 10. The baffle 1 is L-shaped and is hinged to the frame 3 via the pivot 2. The vertical part of the baffle 1 extends out of the upper part of the frame 3 and is equipped with a buffer pad 5 to limit the movement of the cargo box. The horizontal part of the baffle 1 overlaps with the roller 7 installed on the overlapping rocker arm 9. The limiting block 6 is fixed on the frame 3 to limit the displacement of the stop ear 1 when it rotates counterclockwise; Unlock signal switch 4 and lock signal switch 8 are mounted on rack 3 to provide signal feedback of locked or unlocked status; The overlapping rocker arm 9 is hinged to the frame 3 via a pivot and is also hinged to the sector member 13 via a connecting piece 12. The sector-shaped component 13 is hinged to the frame 3 via a pivot and slides in contact with the arc-shaped boss of the rotating electromagnet 10. The rotating electromagnet 10 is fixedly mounted on the frame 3 and is used to receive electrical signals to drive the sector component 13 to move. Electromagnetic safety pin 11 is installed on the frame 3 and located on the side below the L-shaped long rocker arm of the overlapping rocker arm 9, for safety limiting under abnormal working conditions.

[0008] In one possible embodiment, a first torsion spring 14 is provided on the rotating shaft of the baffle 1 to keep the baffle 1 stable in a vibration environment. A second torsion spring 15 is provided on the rotating shaft of the sector component 13 to assist the sector component 13 in quickly rotating and resetting after the limit is released.

[0009] In one possible embodiment, the operating voltage of the rotating electromagnet 10 is 28V·DC to 32V·DC, and the rotation angle of the moving part of the rotating electromagnet 10 is 7° to 11°.

[0010] In one possible embodiment, the device further includes a manual unlocking component 16, which is mounted on a frame 3 on one side of the rotating electromagnet 10. The lever 18 of the manual unlocking component 16 is located below the movable part of the rotating electromagnet 10 and is used to manually drive the movable part of the rotating electromagnet 10 to rotate for unlocking.

[0011] In one possible embodiment, a manual locking rocker arm 17 extends from one end of the pivot of the sector member 13. By lifting the manual locking rocker arm 17 upwards, the sector member 13 is rotated, thereby enabling manual locking.

[0012] In one possible embodiment, the long arm end of the lap rocker arm 9 is provided with a roller 7, and the short arm end is connected to the fan-shaped member 13 through a connecting piece 12.

[0013] In one possible embodiment, the long arm end of the L-shaped structure of the overlapping rocker arm 9 is provided with a weight block.

[0014] The main solution and its various further alternatives described above can be freely combined to form multiple solutions, all of which are solutions that can be adopted and are claimed in this application; furthermore, the (non-conflicting alternatives) can also be freely combined with each other and with other alternatives. Those skilled in the art, after understanding the solution of this application, will realize from the prior art and common general knowledge that there are many combinations, all of which are technical solutions to be protected in this application, and will not be exhaustively listed here.

[0015] This application discloses an electromagnetically driven limiting lock device, which mainly includes a frame, an L-shaped stop, a buffer pad, a rotating electromagnet, an overlapping rocker arm, a sector-shaped component, an electromagnetic safety pin, and a signal switch. The stop is hinged to the frame via a pivot, with a buffer pad on its vertical portion for limiting the movement of the cargo box, and its horizontal portion overlapping with rollers on the overlapping rocker arm. The overlapping rocker arm is hinged to the sector-shaped component via a connecting piece, and the sector-shaped component contacts the arc-shaped boss of the rotating electromagnet. When the rotating electromagnet is energized, it drives the sector-shaped component to move, which in turn drives the stop to rotate through the connecting piece and the overlapping rocker arm, achieving rapid unlocking of the cargo box. The device also includes a limiting block, unlocking and locking signal switches, and an electromagnetic safety pin, improving the reliability and safety of the limiting action. This device has a compact structure, fast response speed, and strong load-bearing capacity, and is suitable for reliable limiting of cargo box movement and signal-controlled delivery of cargo drones in vibration environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an electromagnetically driven limiting lock device according to an embodiment of this application is shown.

[0018] Figure 2 A schematic diagram of the unlocking state of the electromagnetic drive limiting lock device proposed in the embodiments of this application is shown.

[0019] Figure 3 The front view of the electromagnetic drive limiting lock device according to an embodiment of this application is shown.

[0020] Figure 4 A top view of the actual electromagnetically driven limiting lock device is shown.

[0021] Figure 5 A schematic diagram of the core internal linkage structure of the electromagnetically driven limiting lock device is shown.

[0022] Reference numerals: 1-Awl; 2-Shaft; 3-Frame; 4-Unlock signal switch; 5-Buffer pad; 6-Limiting block; 7-Roller; 8-Lock signal switch; 9-Overlapping rocker arm; 10-Rotating electromagnet; 11-Electromagnetic safety pin; 12-Connecting piece; 13-Fan-shaped component; 14-First torsion spring; 15-Second torsion spring; 16-Manual unlocking assembly; 17-Manual locking rocker arm; 18-Lever. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0024] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In existing technologies, medium and large-sized UAVs need to achieve limiting of cargo after loading and rapid unlocking after receiving signals in the air when performing material delivery missions. Currently, most cargo box limiting locks in the industry use motors as the driving force, and are limited by installation space, resulting in the disadvantages of similar devices such as long reaction time and small load.

[0026] Therefore, to solve the aforementioned technical problems, this application proposes an electromagnetically driven limiting lock device. In this device, the stop lug is used to limit the movement of the cargo box, the buffer pad is used to protect the cargo box in a vibration environment, and the limiting block is used to limit the reverse force on the stop lug. The overlapping rocker arm overlaps with the right arc surface of the stop lug via its upper roller and is connected to the sector-shaped component via a connecting piece. The sector-shaped component overlaps with the rotating electromagnet to achieve movement limitation. An electromagnetic safety pin increases the reliability of the device. This device has the advantages of simple structure, high reliability, easy disassembly and maintenance, light weight, and large load capacity, which will be described in detail below.

[0027] Please refer to Figure 1 , Figure 1 The diagram shows a schematic of the structure of an electromagnetically driven limiting lock device according to an embodiment of this application. The device includes a frame 3, a stop ear 1, a buffer pad 5, a rotating shaft 2, an unlocking signal switch 4, a limiting block 6, a roller 7, a locking signal switch 8, a connecting rocker arm 9, an electromagnetic safety pin 11, a connecting piece 12, a sector-shaped part 13, and a rotating electromagnet 10. The baffle 1 is L-shaped and is hinged to the frame 3 via the pivot 2. The vertical part of the baffle 1 extends out of the upper part of the frame 3 and is equipped with a buffer pad 5 to limit the movement of the cargo box. The horizontal part of the baffle 1 overlaps with the roller 7 installed on the overlapping rocker arm 9. The limiting block 6 is fixed on the frame 3 to limit the displacement of the stop ear 1 when it rotates counterclockwise; Unlock signal switch 4 and lock signal switch 8 are mounted on rack 3 to provide signal feedback of locked or unlocked status; The overlapping rocker arm 9 is hinged to the frame 3 via a pivot and is also hinged to the sector member 13 via a connecting piece 12. The sector-shaped component 13 is hinged to the frame 3 via a pivot and slides in contact with the arc-shaped boss of the rotating electromagnet 10. The rotating electromagnet 10 is fixedly mounted on the frame 3 and is used to receive electrical signals to drive the sector component 13 to move. Electromagnetic safety pin 11 is installed on the frame 3 and located on the side below the L-shaped long rocker arm of the overlapping rocker arm 9, for safety limiting under abnormal working conditions.

[0028] The frame 3, serving as the main support for the entire device, is made of high-strength materials. The lug 1 has an L-shaped structure and is hinged to the frame 3 via a pivot 2. Its vertical portion extends beyond the upper part of the frame and is equipped with a buffer pad 5 to directly limit the movement of the cargo box; the horizontal portion overlaps with the rollers 7 mounted on the overlapping rocker arm 9, forming a force transmission path. The buffer pad 5 is made of elastic material, which can effectively absorb the impact and vibration of the cargo box, protecting the cargo box and the device itself.

[0029] The limiting block 6 is fixed to the frame 3 and located on the counterclockwise rotation path of the stop ear 1. It is used to limit the excessive displacement of the stop ear 1 and ensure the accuracy of the limiting position. The unlocking signal switch 4 and the locking signal switch 8 are both installed on the frame 3. They are used to detect the unlocking and locking states, respectively, and provide discrete signal feedback to the control system. The lap rocker arm 9 is hinged to the frame 3 through a rotating shaft. It adopts an L-shaped structure design. One end is equipped with a roller 7 to reduce the friction when in contact with the stop ear 1. The other end is hinged to the fan-shaped part 13 through the connecting piece 12 to realize motion transmission.

[0030] The sector-shaped component 13 is hinged to the frame 3 via a pivot, and its arc-shaped surface slides in contact with the arc-shaped boss of the rotating electromagnet 10. The rotating electromagnet 10 is fixedly mounted on the frame 3 and is used to drive the sector-shaped component 13 to move after receiving an electrical signal, thereby realizing the unlocking operation. The operating voltage of the rotating electromagnet 10 is 28V·DC~32V·DC, and the rotation angle of its moving part is 7°~11°. The electromagnetic safety pin 11 is mounted on the frame 3 and located on the lower side of the L-shaped long rocker arm of the overlapping rocker arm 9, used to lock the overlapping rocker arm 9 under abnormal operating conditions, thereby enhancing the safety of the device.

[0031] The device is locked as follows Figure 1 As shown, when the cargo box is pushed to the limit position, the stop ear 1 is lifted to the limit block 6, the manual locking rocker arm 17 is lifted, and the fan-shaped part 13 is rotated upward, so that the overlapping rocker arm 9 supports the horizontal part of the stop ear 1 through the roller 7 to form a lock.

[0032] Figure 2 The diagram illustrates the unlocking state of the electromagnetic drive limiting lock device proposed in this application. When the system issues an unlocking command, the rotating electromagnet 10 is energized and rotates clockwise, separating from the sector member 13. The sector member 13 rotates counterclockwise under the action of the torsion spring 15, pulling the overlapping rocker arm 9 through the connecting piece 12, causing the roller 7 to separate from the stop ear 1. The stop ear 1 rotates under the action of gravity or external force, contacting the unlocking signal switch 4 to trigger the unlocking signal. Manual unlocking can achieve the same effect by pushing the lever 18 of the manual unlocking component 16.

[0033] This device features a simple structure, light weight, and large payload capacity. It utilizes electromagnetic drive instead of a traditional motor, improving response speed. Furthermore, a manual backup function and signal feedback mechanism enhance its practicality, making it suitable for the harsh environments of cargo drones.

[0034] A first torsion spring 14 is provided on the rotating shaft of the ear 1 to keep the ear 1 stable in a vibration environment; A second torsion spring 15 is provided on the rotating shaft of the sector component 13 to assist the sector component 13 in quickly rotating and resetting after the limit is released.

[0035] The first torsion spring 14 is mounted on the rotating shaft of the stop ear 1. By providing a continuous preload torque, it enables the stop ear to automatically press against the limiting block 6 or maintain a predetermined position when it is not locked or under external force. The second torsion spring 15 is mounted on the rotating shaft of the sector member 13, and its preload direction is set to drive the sector member to rotate in the unlocking direction. When the rotating electromagnet 10 is activated and the limiting force on the sector member is released, the elastic potential energy stored in the second torsion spring is immediately released, providing the sector member with an initial and rapid acceleration, thereby driving the entire linkage mechanism to move rapidly. Ultimately, the stop ear completes the unlocking action quickly and crisply, significantly shortening the unlocking response time.

[0036] The device also includes a manual unlocking component 16, which is mounted on the frame 3 on one side of the rotating electromagnet 10. Its lever 18 is located below the movable part of the rotating electromagnet 10 and is used to manually drive the movable part of the rotating electromagnet 10 to rotate in order to unlock it.

[0037] The manual unlocking component 16 provides an emergency operation method in case of emergency or power failure. By manually pushing the lever 18, the movable part of the rotating electromagnet 10 can be directly moved to simulate the rotational action during electric unlocking, thereby releasing the restriction on the sector 13 and driving the entire transmission mechanism to complete the unlocking. Figure 4The diagram shows a top view of the electromagnetically driven limiting lock device. The manual unlocking component 16, located slightly to the left of the center on the upper part of the frame, is a small protruding structure containing a horizontally movable lever. In the event of automatic unlocking failure, the operator can directly move this component from here to drive the internal sector component and rotating electromagnet, achieving mechanical emergency unlocking.

[0038] One end of the pivot of the sector-shaped component 13 extends to form a manual locking rocker arm 17. By lifting the manual locking rocker arm 17 upward, the sector-shaped component 13 can be rotated, thereby achieving manual locking.

[0039] The manual locking rocker arm 17 is integrally connected to the pivot of the sector component 13, forming a simple lever. When the rocker arm is lifted upward, the torque generated will directly drive the sector component 13 to rotate around the pivot, thereby pushing the connecting piece and the rocker arm to move, and finally causing the stop ear 1 to return to the locked position.

[0040] Figure 3 The diagram shows a front view of the electromagnetic drive limiting lock device according to an embodiment of this application. The main body of the device is a frame 3, with a pivot 2 on the upper part used to hinge the stop ears. A buffer pad 5 is located at the top to contact and cushion the cargo box. A manual locking rocker arm 17 is installed on the right side of the device for easy manual operation, while the electromagnetic safety pin 11 on the side serves as a safety redundancy mechanism, which can lock the internal transmission components in case of abnormality.

[0041] The overlapping rocker arm 9 has an L-shaped structure, with a roller 7 at the long arm end and the short arm end connected to the fan-shaped part 13 via a connecting piece 12.

[0042] The roller 7 is used to make low-friction contact with the lug 1, effectively transmitting force and reducing wear; its short arm end is hinged to the fan-shaped part 13 through the connecting piece 12, thereby efficiently converting the rotational motion of the fan-shaped part into the swing of the rocker arm.

[0043] The long arm end of the L-shaped structure of the overlapping rocker arm 9 is equipped with a weight block. By utilizing the principle of counterweight, the mass of this end is increased. By increasing the inertia of the rocker arm's moving parts, it helps to stabilize the posture of the overlapping rocker arm when the device is subjected to external vibration or impact, and suppresses its unnecessary slight shaking or flutter.

[0044] The buffer pad 5 is made of elastic material. When the lug 1 comes into contact with the cargo box, it absorbs and buffers the impact and vibration energy through the deformation of the material itself, thereby effectively protecting the surface of the cargo box and reducing the noise and hard impact generated by the device during locking and loading.

[0045] Figure 5A schematic diagram of the core internal linkage structure of the electromagnetically driven limiting lock device is shown. The power and transmission parts of the device are centrally located, with the rotating shaft of the rotating electromagnet 10 contacting the sector-shaped component 13. The sector-shaped component 13 is connected to the connecting piece 12 via a hinge point, and the other end of the connecting piece is hinged to the lap rocker arm 9, thereby converting the rotation of the rotating electromagnet into the swing of the lap rocker arm. One end of the lap rocker arm is equipped with a roller 7 for engaging with the stop ear, and the other end is connected to the torsion spring 15 for reset, ensuring reset after unlocking. The device also integrates a status detection function, with the unlock signal switch 4 and the lock signal switch 8 designed in corresponding positions and triggered by the moving parts to provide electrical signal feedback.

[0046] In one possible implementation, step 1: after the goods are pushed to the left, lift and rotate the stop ear 1 of the limiting lock to the position of the limiting block 6, keep the stop ear 1, and at the same time lift the locking rocker arm 17 of the device to the horizontal position. After releasing the hand, both the stop ear 1 and the locking rocker arm 17 can maintain this position, completing the manual locking. At the same time, the locking rocker arm 17 contacts the locking signal switch 8 to provide a discrete signal to the system. Step 2: Slightly lift the manual unlocking component 16 and push it diagonally downward to the left, causing the lever 18 to rotate upward. The moving part of the rotating electromagnet 10 rotates clockwise, and the sector 13 loses its balance and rotates counterclockwise under the action of the torsion spring 15. At the same time, the stop ear 1 separates from the roller 7 and releases the restriction on the movement of the goods. After the stop ear 1 rotates to the position, it contacts the unlocking signal switch 4 to provide a discrete signal to the system. Step 3: The system provides a 28V•DC~32V•DC voltage according to the instruction to drive the rotating electromagnet 10 to rotate clockwise until it separates from the sector part 13. The sector part 13 loses its balance and rotates counterclockwise under the action of the torsion spring 15. At the same time, the baffle 1 separates from the roller 7 and releases the restriction on the movement of the goods. After the baffle 1 rotates to the position, it contacts the unlocking signal switch 4 to provide a discrete signal to the system.

[0047] Compared with the prior art, the embodiments of this application have the following beneficial effects: First, it uses a rotating electromagnet as the core drive, directly outputting rotational torque. Compared with the traditional motor drive method, it eliminates the complex reduction transmission mechanism, greatly shortens the action response time, and realizes fast and reliable unlocking of the cargo box.

[0048] Secondly, through the ingenious design of lever and overlapping rocker arm structure, the transmission and amplification of force are achieved through simple mechanical linkage, making the overall structure compact and the number of parts small, while achieving greater load-bearing and locking force within a limited space.

[0049] Third, based on electric drive unlocking, manual unlocking and manual locking functions are integrated, providing effective emergency operation redundancy and ensuring that the device can still operate under special circumstances such as power system failure, significantly improving the overall mission reliability of the system.

[0050] Fourth, an independent lock and unlock signal switch is set up, which can provide real-time and accurate feedback on the locking status of the device to the control system, realizing automated monitoring and logical interlocking of the working process, and improving the intelligence level and security of the entire delivery system.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electromagnetically driven limiting lock device, characterized in that, Includes frame (3), lug (1), buffer pad (5), rotating shaft (2), unlocking signal switch (4), limiting block (6), roller (7), locking signal switch (8), overlapping rocker arm (9), electromagnetic safety pin (11), connecting piece (12), sector part (13) and rotating electromagnet (10). The baffle (1) is L-shaped and is hinged to the frame (3) via a pivot (2). The vertical part of the baffle (1) extends out of the upper part of the frame (3) and is equipped with a buffer pad (5) to limit the movement of the cargo box. The horizontal part of the baffle (1) overlaps with the roller (7) installed on the overlapping rocker arm (9). The limiting block (6) is fixed on the frame (3) to limit the displacement of the stop ear (1) when it rotates counterclockwise; The unlock signal switch (4) and the lock signal switch (8) are mounted on the frame (3) to provide signal feedback of the locked or unlocked state; The overlapping rocker arm (9) is hinged to the frame (3) via a pivot and is hinged to the sector piece (13) via a connecting piece (12); The fan-shaped part (13) is hinged to the frame (3) via a pivot and slides in contact with the arc-shaped boss of the rotating electromagnet (10); A rotating electromagnet (10) is fixedly mounted on the frame (3) and is used to receive electrical signals to drive the fan-shaped component (13) to move; The electromagnetic safety pin (11) is installed on the frame (3) and located on the side below the L-shaped long rocker arm of the overlapping rocker arm (9) for safety limiting under abnormal working conditions.

2. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, A first torsion spring (14) is provided on the rotating shaft of the stop (1) to keep the stop (1) stable in a vibration environment; A second torsion spring (15) is provided on the rotating shaft of the sector component (13) to assist the sector component (13) in quickly rotating and resetting after the limit is released.

3. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The operating voltage of the rotating electromagnet (10) is 28V·DC to 32V·DC, and the rotation angle of the moving part of the rotating electromagnet (10) is 7° to 11°.

4. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The device also includes a manual unlocking component (16), which is mounted on a frame (3) on one side of the rotating electromagnet (10). The lever (18) of the manual unlocking component (16) is located below the movable part of the rotating electromagnet (10) and is used to manually drive the movable part of the rotating electromagnet (10) to rotate for unlocking.

5. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The fan-shaped component (13) has a manual locking rocker arm (17) extending from one end of its pivot. By lifting the manual locking rocker arm (17) upwards, the fan-shaped component (13) is rotated, thereby enabling manual locking.

6. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The long arm end of the lap rocker arm (9) is provided with a roller (7), and the short arm end is connected to the fan-shaped part (13) through a connecting piece (12).

7. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The long arm end of the L-shaped structure of the overlapping rocker arm (9) is provided with a weight block.

8. The electromagnetic drive limiting lock device as described in claim 1, characterized in that, The cushioning pad (5) is made of elastic material.

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