A spring operating device with under voltage tripping and manual locking function

Abstract

The application discloses a spring operating device with under-voltage tripping and manual locking functions and relates to the technical field of high-voltage switches.The spring operating device comprises a mechanism box, an output crank arm and a tripping pin shaft are arranged on a spring operating assembly, a main tripping electromagnet is arranged at the front end of the tripping pin shaft, an under-voltage tripping assembly is arranged side by side with the main tripping electromagnet and comprises a front-end electromagnet and a rear-end electromagnet connected in series, the striker rod of the under-voltage tripping assembly is extended to hit the tripping pin shaft when power is lost, a plug plate is movably arranged between the front-end electromagnet and the rear-end electromagnet, the plug plate is provided with a U-shaped groove for blocking the striker rod of the front-end electromagnet from being extended when the plug plate is in a locking position, a manual locking assembly is arranged on the mechanism box and is in transmission connection with the plug plate through a steel wire rope, and the manual locking assembly is used for driving the plug plate to switch between a locking position and an unlocking position.The spring operating device realizes automatic tripping protection when power is lost, can mechanically lock the under-voltage tripping function through the manual locking assembly, ensures the safety of maintenance, and has the advantages of compact structure, high modularization degree and convenient operation.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, and more specifically to a spring-operated device with undervoltage tripping and manual locking functions. Background Technology

[0002] As a core power component of high-voltage circuit breakers, spring-operated assemblies play a crucial role in the field of high-voltage switching, directly affecting the operational safety and power supply reliability of the power grid. Traditional spring-operated assemblies typically rely on external control voltage for tripping operations. However, when a power grid fault causes a drop in control voltage or a complete power outage, conventional spring-operated assemblies cannot automatically perform the tripping action, resulting in the circuit breaker failing to interrupt the fault current in a timely manner. In severe cases, this can lead to large-scale power outages, threatening the stable operation of the power grid.

[0003] Furthermore, during on-site commissioning, inspection, or maintenance of equipment, a manual interlocking component capable of temporarily locking the automatic tripping function is needed to prevent accidental circuit breaker tripping due to misoperation or voltage fluctuations and to ensure the personal safety of operators. While some undervoltage protection devices exist in the current technology, they generally suffer from complex structures, large size, high cost, and the inability to simultaneously provide both automatic protection and manual interlocking functions, making it difficult to meet the requirements of modern high-voltage switchgear for miniaturization, modularity, and high reliability.

[0004] Therefore, developing a spring-operated device that is simple in structure, compact in size, and capable of both automatic tripping protection in the event of power failure and manual locking of the function as needed under operating conditions has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a spring operating device with undervoltage tripping and manual locking functions, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A spring-operated device with undervoltage tripping and manual locking functions includes: Mechanism box; A spring-operated assembly is disposed inside the mechanism housing. The spring-operated assembly is provided with an output crank arm and a rotatably disposed tripping pin. The output crank arm is used for transmission connection with the circuit breaker body. The main tripping electromagnet is installed inside the mechanism box and located at the front end of the tripping release pin. The strike rod of the main tripping electromagnet extends and strikes the tripping release pin when energized to trigger tripping. An undervoltage trip assembly is provided inside the mechanism housing and arranged side by side with the main trip electromagnet, located at the front end of the trip pin. The undervoltage trip assembly includes a front electromagnet and a rear electromagnet connected in series. The striking rods of the front electromagnet and the rear electromagnet extend in the de-energized state and directly strike the trip pin to trigger tripping. An insert plate is movably disposed between the front electromagnet and the rear electromagnet. The insert plate has a U-shaped groove, which is located on the extension path of the front electromagnet's striking rod when the insert plate is in the locked position, and is used to physically block the extension of the striking rod. A manual locking assembly is mounted on the mechanism box and is connected to the insert plate via a steel wire rope. It is used to drive the insert plate to switch between the locked and unlocked positions via mechanical transmission.

[0008] Through the above technical solution, this invention integrates an undervoltage trip assembly and a main trip electromagnet arranged side-by-side at the front end of the trip pin shaft. By utilizing the series-connected front and rear electromagnets to simultaneously release the strike rod and directly impact the pin shaft in the event of power failure, it achieves a reliable automatic tripping function under conditions of reduced control voltage or power failure, significantly improving protection capabilities and operational safety during power grid faults. Simultaneously, this solution, by incorporating a vertically movable insert plate with a U-shaped groove and an external manual interlocking assembly driven by a wire rope, achieves purely mechanical, switchable manual interlocking and unlocking of the undervoltage tripping function. This ensures personal safety during normal commissioning and maintenance operations while avoiding complex electrical interlocking. The overall structure is compact and rationally laid out. The modular design of the manual interlocking device facilitates disassembly, assembly, and position adjustment, offering significant advantages such as simple structure, low cost, high reliability, and ease of maintenance.

[0009] Preferably, in the above-mentioned spring-operated device with undervoltage tripping and manual locking functions, the manual locking component includes: Support; A rotating shaft, which is rotatably mounted on the support; A handle, which is fixedly connected to one end of the rotating shaft; Gear, the gear being fixedly sleeved on the rotating shaft; A rack is slidably mounted on the support and meshes with the gear; one end of the wire rope is fixedly connected to the rack, and the other end passes through the mechanism box and is fixedly connected to the insert plate.

[0010] Preferably, in the above-mentioned spring operating device with undervoltage release and manual locking function, a plurality of limiting grooves are provided on the circumferential surface of the rotating shaft, and an elastic pin assembly is provided on the support; the elastic pin assembly includes a pin, a spring and a set screw, the pin presses against the circumferential surface of the rotating shaft under the action of the spring, and is engaged in the corresponding limiting groove when the rotating shaft rotates, so as to fix the rotation position of the rotating shaft.

[0011] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the undervoltage tripping assembly further includes a reset spring. One end of the reset spring is connected to the upper part of the insert plate, and the other end is connected to the housing of the undervoltage tripping assembly or the mechanism box, for providing an elastic force to drive the insert plate to reset upward.

[0012] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the undervoltage tripping assembly further includes a first micro switch. The first micro switch is disposed on one side of the insert plate, and its contacts abut or separate from the outer edge of the insert plate, for outputting a corresponding locking status signal when the insert plate moves to the locked position or the unlocked position.

[0013] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the undervoltage tripping assembly further includes a second micro switch. The second micro switch is disposed at the tail of the rear electromagnet, and its contacts abut or separate from the tail of the strike rod of the rear electromagnet. It is used to output an engagement or disengagement status signal of the undervoltage tripping assembly when the rear electromagnet is engaged or disengaged.

[0014] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the front electromagnet and the rear electromagnet are simultaneously attracted under rated voltage and simultaneously released when the voltage is lower than the set value.

[0015] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the wire rope is a flexible transmission component, and the manual locking assembly achieves a long-distance transmission connection across the main trip electromagnet through the wire rope and the plug plate.

[0016] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the manual locking component is a modular structure independent of the outside of the mechanism box, and is detachably connected to the side wall or panel of the mechanism box through mounting holes.

[0017] Preferably, in the above-mentioned spring operating device with undervoltage tripping and manual locking functions, the main tripping electromagnet and the undervoltage tripping assembly are arranged side by side in the transverse direction at the front end of the tripping tripping pin, and the two work together to lock the same tripping tripping pin.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a spring operating device with undervoltage tripping and manual locking functions, which has the following beneficial effects: 1. Automatic power failure protection: It can automatically trigger the trip when the control voltage drops or power is completely lost, without manual intervention, effectively ensuring the safe operation of the power grid under fault conditions.

[0019] 2. Equipped with manual interlocking safety function: Through a purely mechanical manual interlocking device, the undervoltage tripping function can be reliably locked during maintenance or debugging to prevent accidental tripping and significantly improve operational safety.

[0020] 3. Easy to operate and visible status: The manual interlocking device is easy to operate and has an automatic positioning function; when used with a micro switch, it can provide real-time feedback on the interlocking status and protection activation status, which is convenient for remote monitoring.

[0021] 4. Compact structure and easy maintenance: It adopts flexible steel wire rope drive and modular design, which makes the layout flexible and easy to disassemble and assemble. While achieving functional integration, it maintains the advantages of simple structure and low cost. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 The attached figure is a schematic diagram of the structure of the spring operating device with undervoltage tripping and manual locking functions provided by the present invention. Figure 2 The attached figure is a structural schematic diagram of the undervoltage tripping assembly and the manual locking assembly provided by the present invention; Figure 3 The attached figure is a structural schematic diagram of the manual locking assembly provided by the present invention; Figure 4 The attached figure is a schematic diagram of the structure of the rotating shaft provided by the present invention; Figure 5 The attached figure is a schematic diagram of the structure of the insert plate provided by the present invention.

[0024] in: 1-Undervoltage trip assembly; 2-Spring operating assembly; 3-Output crank arm; 4-Trip pin; 5-Manual locking assembly; 6-Mechanism box; 7-Front-end electromagnet; 8-Insertion plate; 9-Reset spring; 10-Micro switch; 11-Rear electromagnet; 12-Tail micro switch; 13-Rack; 14-Gear; 15-Handle; 16-Wire rope; 17-Main trip electromagnet; 18-Shaft; 19-Pin; 20-Spring; 21-Setting screw; 22-Support; 23-U-groove; 24-Limit groove. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] See appendix Figure 1 To be continued Figure 3 and attached Figure 5 This invention discloses a spring-operated device with undervoltage tripping and manual locking functions, comprising: Mechanism box 6; Spring operating assembly 2 is installed inside mechanism box 6. The spring operating assembly 2 is equipped with output crank arm 3 and rotating trip pin 4. The output crank arm 3 is used for transmission connection with the circuit breaker body. The main tripping electromagnet 17 is installed inside the mechanism box 6 and located at the front end of the tripping release pin 4. When the main tripping electromagnet 17 is energized, the strike rod extends and strikes the tripping release pin 4 to trigger the tripping. The undervoltage trip assembly 1 is installed inside the mechanism box 6 and is arranged side by side with the main trip electromagnet 17, and is located at the front end of the trip pin 4. The undervoltage trip assembly 1 includes a front electromagnet 7 and a rear electromagnet 11 connected in series. The striking rods of the front electromagnet 7 and the rear electromagnet 11 extend in the de-energized state and directly strike the trip pin 4 to trigger the trip. Insert plate 8 is movably disposed between front electromagnet 7 and rear electromagnet 11. Insert plate 8 has a U-shaped groove 23. When insert plate 8 is in the locked position, U-shaped groove 23 is located on the extension path of the front electromagnet 7's striking rod, which is used to physically block the extension of the striking rod. The manual locking assembly 5 is mounted on the mechanism box 6 and is connected to the insert plate 8 via a steel wire rope 16. It is used to drive the insert plate 8 to switch between the locked and unlocked positions via mechanical transmission.

[0027] To further optimize the above technical solution, the manual locking component 5 includes: Support 22; A rotating shaft 18 is rotatably mounted on a support 22. Handle 15, which is fixedly connected to one end of the rotating shaft 18; Gear 14 is fixedly sleeved on the rotating shaft 18; The rack 13 is slidably mounted on the support 22 and meshes with the gear 14; one end of the wire rope 16 is fixedly connected to the rack 13, and the other end passes through the mechanism box 6 and is fixedly connected to the insert plate 8.

[0028] See appendix Figure 4 The circumferential surface of the rotating shaft 18 is provided with multiple limiting grooves 24, and the support 22 is provided with an elastic pin assembly. The elastic pin assembly includes a pin 19, a spring 20 and a set screw 21. The pin 19 presses against the circumferential surface of the rotating shaft 18 under the action of the spring 20, and is engaged in the corresponding limiting groove 24 when the rotating shaft 18 rotates, so as to fix the rotation position of the rotating shaft 18.

[0029] To further optimize the above technical solution, the undervoltage release assembly 1 also includes a reset spring 9. One end of the reset spring 9 is connected to the upper part of the insert plate 8, and the other end is connected to the housing or mechanism box 6 of the undervoltage release assembly 1, so as to provide elastic force to drive the insert plate 8 to reset upward.

[0030] To further optimize the above technical solution, the undervoltage tripping assembly 1 also includes a first micro switch 10. The first micro switch 10 is disposed on one side of the plug plate 8, and its contacts abut or separate from the outer edge of the plug plate 8. It is used to output a corresponding locking status signal when the plug plate 8 moves to the locked position or the unlocked position.

[0031] To further optimize the above technical solution, the undervoltage trip assembly 1 also includes a second micro switch 12. The second micro switch 12 is located at the tail of the rear electromagnet 11, and its contacts abut or separate from the tail of the strike rod of the rear electromagnet 11. It is used to output the engagement or disengagement status signal of the undervoltage trip assembly 1 when the rear electromagnet 11 is engaged or disengaged.

[0032] To further optimize the above technical solution, the front electromagnet 7 and the rear electromagnet 11 are simultaneously engaged under rated voltage and simultaneously released when the voltage is lower than the set value.

[0033] To further optimize the above technical solution, the wire rope 16 is a flexible transmission component, and the manual locking assembly 5 achieves a long-distance transmission connection across the main trip electromagnet 17 through the wire rope 16 and the plug plate 8.

[0034] To further optimize the above technical solution, the manual locking component 5 is a modular structure independent of the external mechanism box 6, and can be detachably connected to the side wall or panel of the mechanism box 6 through mounting holes.

[0035] To further optimize the above technical solution, the main trip electromagnet 17 and the undervoltage trip assembly 1 are arranged side by side in the transverse direction at the front end of the trip trip pin 4, and the two work together to lock the same trip trip pin 4.

[0036] This invention discloses a spring-operated device with undervoltage tripping and manual locking functions. The spring-operated assembly 2 is located inside the mechanism housing 6 and serves as the power source for driving the circuit breaker's opening and closing. The spring-operated assembly 2 is equipped with an output crank arm 3 and a rotatably mounted tripping pin 4. The output crank arm 3 is connected to the circuit breaker body via a connecting rod. When the energy stored in the spring-operated assembly 2 is released, the output crank arm 3 swings, driving the circuit breaker to perform opening and closing operations. The tripping pin 4 is a key locking component controlling the tripping mechanism; it is equipped with a locking gate. When the locking gate is struck, the mechanism trips and performs the tripping action.

[0037] The main tripping electromagnet 17 is installed inside the mechanism housing 6, located at the front end of the tripping release pin 4. The main tripping electromagnet 17 is used for conventional electric tripping operation: when a tripping command is received, the main tripping electromagnet 17 is energized, its striker extends and strikes the lock door on the tripping release pin 4, triggering the spring operating assembly 2 to complete the tripping.

[0038] The undervoltage release assembly 1 is arranged side-by-side with the main trip electromagnet 17, also located at the front end of the trip pin 4. The undervoltage release assembly 1 consists of a front electromagnet 7 and a rear electromagnet 11 connected in series. They are connected in series in the circuit and arranged side-by-side in the mechanical structure. In the de-energized state, the striking rods of the front electromagnet 7 and the rear electromagnet 11 extend and directly strike the locking gate on the trip pin 4, realizing automatic trip protection in the event of power failure.

[0039] The insertion plate 8 is movably positioned between the front electromagnet 7 and the rear electromagnet 11. (See attached diagram.) Figure 5 The insert plate 8 has a U-shaped groove 23. When the insert plate 8 is in the locked position (moving downward), the U-shaped groove 23 is exactly on the extension path of the front electromagnet 7 striking rod, and the side wall of the U-shaped groove physically blocks the striking rod from extending forward; when the insert plate 8 is in the unlocked position (moving upward), the U-shaped groove 23 avoids the extension path of the striking rod, and the striking rod can extend freely.

[0040] The manual locking assembly 5 is mounted on the mechanism box 6 and is connected to the insert plate 8 via a steel wire rope 16. It is used to drive the insert plate 8 to switch between the locked and unlocked positions.

[0041] See appendix Figure 2 and attached Figure 3The manual locking assembly 5 includes the following structure: a support 22, a rotating shaft 18, a handle 15, a gear 14, and a rack 13. The rotating shaft 18 is rotatably mounted on the support 22; the handle 15 is fixedly connected to one end of the rotating shaft 18 for manual operation; the gear 14 is fixedly mounted on the rotating shaft 18; and the rack 13 is slidably mounted on the support 22 and meshes with the gear 14. One end of the wire rope 16 is fixedly connected to the rack 13, and the other end passes through the mechanism box 6 and is fixedly connected to the insert plate 8.

[0042] When the operator turns the handle 15, the handle 15 drives the rotating shaft 18 to rotate, and the gear 14 on the rotating shaft 18 rotates accordingly, driving the rack 13 to move in a straight line. When the rack 13 moves, it pulls the wire rope 16, and the wire rope 16 pulls the insert plate 8 to move up and down, thereby realizing the switching between locking and unlocking.

[0043] See appendix Figure 4 To achieve automatic positioning of the handle, multiple limiting grooves 24 are provided on the circumferential surface of the rotating shaft 18, and an elastic ejector assembly is provided on the support 22. The elastic ejector assembly includes an ejector pin 19, a spring 20, and a set screw 21. Under the action of the spring 20, the ejector pin 19 is always pressed against the circumferential surface of the rotating shaft 18. When the rotating shaft 18 rotates, the set screw 21 is first unscrewed to unlock it, and then it automatically engages with the corresponding limiting groove 24 under the action of the spring force. Finally, the set screw 21 is tightened to fix the rotational position of the rotating shaft 18. In this way, the operator can maintain the locked or unlocked state without continuously holding the handle 15.

[0044] See appendix Figure 2 The undervoltage release assembly 1 also includes a return spring 9. One end of the return spring 9 is connected to the upper part of the insert plate 8, and the other end is connected to the housing or mechanism box 6 of the undervoltage release assembly 1. When the manual locking assembly 5 releases the lock (i.e., releases the wire rope 16), the return spring 9 provides an elastic force to drive the insert plate 8 to return upward, so that the insert plate 8 automatically returns from the locked position to the unlocked position.

[0045] To enable status monitoring and signal feedback, the undervoltage trip assembly 1 is equipped with two microswitches: The first micro switch 10 is disposed on one side of the plug plate 8, and its contacts abut or separate from the outer edge of the plug plate 8. When the plug plate 8 moves to the locked or unlocked position, the outer edge of the plug plate 8 triggers or releases the contacts of the first micro switch 10, thereby outputting a corresponding locked status signal (such as "locked" or "not locked") for monitoring by the secondary circuit.

[0046] The second micro switch 12 is located at the tail of the rear electromagnet 11, and its contacts abut or separate from the tail of the strike rod of the rear electromagnet 11. When the rear electromagnet 11 is engaged (normal voltage) or released (undervoltage), the tail of the strike rod moves, triggering or releasing the contacts of the second micro switch 12, thereby outputting an undervoltage tripping component 1 engagement status signal (such as "protection engaged" or "protection activated").

[0047] The working principle and workflow of this embodiment are as follows: 1. Normal operating condition (normal voltage) When the control voltage is at its rated value, the front electromagnet 7 and the rear electromagnet 11 of the undervoltage trip assembly 1 are simultaneously energized and engaged, and the striking rods of both retract inward, maintaining a safe distance from the locking door on the trip pin 4. At this time, if tripping is required, the main trip electromagnet 17 can be energized to perform a normal tripping operation.

[0048] 2. Undervoltage tripping condition (voltage drop or power loss) When a power grid fault causes the control voltage to drop below the set value or result in a complete power outage, the front electromagnet 7 and the rear electromagnet 11 simultaneously lose power and are released. Their striking rods extend instantaneously under the force of the internal spring. These two striking rods directly strike the locking gate on the tripping pin 4, triggering the spring operating assembly 2 to release its stored energy. This energy is then used to drive the circuit breaker to trip via the output crank arm 3, cutting off the fault current and protecting the power grid.

[0049] 3. Manual lockout mode (during maintenance / adjustment) When the equipment needs to be repaired or debugged, in order to prevent accidental tripping due to voltage fluctuations, the operator can turn the handle 15 of the manual interlocking component 5.

[0050] Locking Operation: Rotating handle 15, through the transmission of shaft 18, gear 14, and rack 13, pulls the wire rope 16, causing the insert plate 8 to move downwards to the locked position. At this time, the U-shaped groove 23 on the insert plate 8 is located in the extension path of the front electromagnet 7's striking rod. Even if a voltage drop occurs and the front electromagnet 7 attempts to extend, it will be physically blocked by the side wall of the U-shaped groove 23, preventing it from striking the trip pin 4, thus reliably locking the undervoltage tripping function. Simultaneously, the first micro switch 10 is triggered, outputting a "locking in progress" signal.

[0051] Release the lock: Rotate handle 15 in the reverse direction to release the tension in wire rope 16. The insert plate 8 automatically moves upward to the unlocked position under the action of the return spring 9. The U-shaped groove 23 clears the path for the striker to extend, restoring the undervoltage tripping function to normal. The first microswitch 10 is released, outputting an "unlocked" signal.

[0052] 4. Status monitoring The second micro switch 12 monitors the status of the back-end electromagnet 11 in real time. When the undervoltage tripping component 1 is de-energized, the second micro switch 12 outputs a "protection action" signal.

[0053] The first micro switch 10 monitors the position of the plug plate 8 in real time and outputs a lockout status signal.

[0054] These signals can be connected to the substation's secondary monitoring system, allowing operators to remotely monitor equipment status.

[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0056] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spring-operated device with undervoltage tripping and manual locking functions, characterized in that, include: Mechanism box (6); Spring operating assembly (2), the spring operating assembly (2) is set in the mechanism box (6), the spring operating assembly (2) is provided with an output crank arm (3) and a rotating trip pin (4), the output crank arm (3) is used to drive the circuit breaker body; The main trip electromagnet (17) is located in the mechanism box (6) and at the front end of the trip release pin (4). The strike rod of the main trip electromagnet (17) extends and strikes the trip release pin (4) when energized to trigger tripping. The undervoltage trip assembly (1) is located inside the mechanism box (6) and is arranged side by side with the main trip electromagnet (17), and is located at the front end of the trip pin (4); the undervoltage trip assembly (1) includes a front electromagnet (7) and a rear electromagnet (11) connected in series, and the striking rods of the front electromagnet (7) and the rear electromagnet (11) extend in the power-off state and directly strike the trip pin (4) to trigger tripping; Insert plate (8), which is movable up and down between the front electromagnet (7) and the rear electromagnet (11), has a U-shaped groove (23) on it. When the insert plate (8) is in the locked position, the U-shaped groove (23) is located on the extension path of the front electromagnet (7) strike rod, and is used to physically block the extension of the strike rod. The manual locking assembly (5) is mounted on the mechanism box (6) and is connected to the insert plate (8) via a steel wire rope (16) for mechanically driving the insert plate (8) to switch between the locked and unlocked positions.

2. The spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The manual locking assembly (5) includes: Support (22); A rotating shaft (18) is rotatably mounted on the support (22); A handle (15) is fixedly connected to one end of the rotating shaft (18); Gear (14), the gear (14) is fixedly sleeved on the rotating shaft (18); A rack (13) is slidably mounted on the support (22) and meshes with the gear (14); one end of the wire rope (16) is fixedly connected to the rack (13), and the other end passes through the mechanism box (6) and is fixedly connected to the insert plate (8).

3. A spring-operated device with undervoltage tripping and manual locking functions according to claim 2, characterized in that, The circumferential surface of the rotating shaft (18) is provided with a plurality of limiting grooves (24), and the support (22) is provided with an elastic pin assembly; the elastic pin assembly includes a pin (19), a spring (20) and a set screw (21). The pin (19) presses against the circumferential surface of the rotating shaft (18) under the action of the spring (20), and is inserted into the corresponding limiting groove (24) when the rotating shaft (18) rotates, so as to fix the rotation position of the rotating shaft (18).

4. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The undervoltage trip assembly (1) also includes a reset spring (9), one end of which is connected to the upper part of the insert plate (8), and the other end is connected to the housing of the undervoltage trip assembly (1) or the mechanism box (6), for providing an elastic force to drive the insert plate (8) to reset upward.

5. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The undervoltage tripping assembly (1) further includes a first micro switch (10), which is disposed on one side of the plug plate (8). Its contacts abut or separate from the outer edge of the plug plate (8) and are used to output a corresponding locking status signal when the plug plate (8) moves to the locked position or the unlocked position.

6. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The undervoltage trip assembly (1) also includes a second micro switch (12), which is located at the tail of the rear electromagnet (11). Its contacts abut or separate from the tail of the strike rod of the rear electromagnet (11) and are used to output the engagement or disengagement status signal of the undervoltage trip assembly (1) when the rear electromagnet (11) is engaged or disengaged.

7. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The front electromagnet (7) and the rear electromagnet (11) are simultaneously attracted under rated voltage and simultaneously released when the voltage is lower than the set value.

8. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The wire rope (16) is a flexible transmission component, and the manual locking assembly (5) achieves a long-distance transmission connection across the main trip electromagnet (17) through the wire rope (16) and the plug plate (8).

9. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The manual locking assembly (5) is a modular structure independent of the external mechanism box (6) and is detachably connected to the side wall or panel of the mechanism box (6) through mounting holes.

10. A spring-operated device with undervoltage tripping and manual locking functions according to claim 1, characterized in that, The main trip electromagnet (17) and the undervoltage trip assembly (1) are arranged side by side in the transverse direction at the front end of the trip trip pin (4), and both act together on the same trip trip pin (4) lock.

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