A self-resetting trip unit

Abstract

The application relates to a self-resetting tripper and relates to the technical field of electrical protection equipment, and comprises a tripper body internally provided with an elastic assembly; the tripper body internally provided with the elastic assembly is used for cooperating with a circuit breaker to release a holding mechanism thereof. The application solves the pain point of manual resetting through a tripper body containing an elastic assembly and a transmission mechanism, realizes full-automatic resetting, when tripping, a top rod of the tripper body extends to push a circuit breaker on-line device, and synchronously extrudes an internal elastic assembly to store potential energy; when resetting, a positive and negative motor drives a threaded column to rotate, drives a threaded tube to move along an axial direction, a drag hook pulls a connecting rod to slide along a fixing frame through a hook, the connecting rod end extrudes the top rod, and the top rod is pushed back by rebounding auxiliary force of the elastic assembly, finally drives the tripper body to reset; manual operation in the interior of equipment is not needed, and the application is suitable for the scene of large trippers with hidden installation and narrow space.

Description

Technical Field

[0001] This application relates to the field of electrical protection equipment technology, and in particular to a self-resetting trip unit. Background Technology

[0002] A trip unit is an electromagnetic device mechanically connected to a circuit breaker to release the holding mechanism and automatically disconnect the circuit breaker. It is widely used in power distribution, industrial control, and the protection of large electrical equipment. In large electrical equipment, the trip unit is usually installed inside the equipment. In existing technology, the reset process of such large trip units often relies on manual operation after the tripping action is completed. Due to the narrow internal space and concealed installation location of the trip unit, manual reset is not only inconvenient and inefficient, but also prone to affecting the normal closing and operation of the circuit breaker due to incomplete reset. This fails to meet the requirements of automated and efficient equipment operation and has obvious shortcomings for improvement. Therefore, a self-resetting trip unit is provided. Utility Model Content

[0003] The purpose of this application is to provide a self-resetting trip unit that can adapt to scenarios where large trip units are "installed in concealed locations and in narrow spaces," significantly improving reset efficiency, and solving the problem in the prior art where manual reset is easily incomplete, affecting the normal closing of the circuit breaker.

[0004] This application provides a self-resetting trip unit with the following technical solution: It includes a trip unit body with an internal elastic component; the trip unit body with the internal elastic component is used to cooperate with a circuit breaker to release its holding mechanism; the trip unit body has a push rod that can extend and retract axially; when the push rod extends, it can push the circuit breaker connection device to achieve tripping; the elastic component inside the trip unit body cooperates with the push rod to store elastic potential energy when the push rod extends and provide a rebound assist force when the push rod retracts; a fixed frame is fixedly connected to the rear end of the trip unit body; a connecting rod is slidably connected inside the fixed frame; a hook is fixedly connected to one end of the connecting rod; the other end of the connecting rod corresponds to and cooperates with the push rod of the trip unit body; a transmission mechanism is provided on the side of the hook away from the connecting rod; the transmission mechanism includes a transmission chamber; a forward and reverse motor is fixedly connected inside the transmission chamber; a threaded column is fixedly connected to the output end of the forward and reverse motor; a threaded tube is threadedly connected to the left end surface of the threaded column; a pull hook is fixedly connected to the end of the threaded tube away from the forward and reverse motor; the pull hook engages with the hook. By adopting the above technical solution, and by setting up a "tripper body with internal elastic components, fixing frame, connecting rod, hook and transmission mechanism", a complete "trip-reset" transmission chain is constructed: when tripping, the top rod extends to disconnect the circuit breaker; when resetting, the forward and reverse motors drive the threaded transmission, and the pull hook and hook drive the connecting rod to squeeze the top rod. Combined with the rebound force of the elastic component, the reset is completed, completely replacing manual reset. This solves the problems of inconvenience and low efficiency of manual operation caused by the "hidden installation and narrow space" of large trippers, and meets the needs of automated equipment operation.

[0005] Preferably, the fixing frame has a sliding groove inside, and the connecting rod passes through the sliding groove and slides in cooperation with the sliding groove.

[0006] By adopting the above technical solution, a sliding groove is opened inside the fixed frame, allowing the connecting rod to pass through and slide within the sliding groove. The sliding groove can precisely limit the movement direction of the connecting rod, preventing deviation or wobbling during sliding, ensuring that the end of the connecting rod away from the hook can be stably aligned with the top rod, providing precise guidance for subsequent pressing of the top rod, preventing incomplete reset due to connecting rod deviation, and improving the stability and accuracy of the reset action.

[0007] Preferably, the pull hook has a U-shaped structure and the hook has an L-shaped structure. The U-shaped opening of the pull hook is engaged with the L-shaped bent end of the hook, and the inner wall of the pull hook is provided with anti-slip protrusions at the contact part with the hook to enhance the stability of the engagement and facilitate disassembly and separation.

[0008] By adopting the above technical solution, the hook is designed as a U-shaped structure and the hook is designed as an L-shaped structure, and anti-slip protrusions are set on the inner wall of the hook. The fit between the U-shaped opening and the L-shaped bend ensures tightness of the connection and facilitates disassembly and maintenance. The anti-slip protrusions can increase the contact friction between the hook and the hook, and prevent the two from separating due to force during the reset transmission. This improves the connection stability and reduces the difficulty of later maintenance, taking into account both transmission reliability and maintenance convenience.

[0009] Preferably, it also includes an external control module and a position sensor. The position sensor is installed on the outside of the trip unit body and is electrically connected to the control module to detect the extension and retraction of the push rod. The control module is electrically connected to the forward and reverse motors to control the start, stop and direction of the forward and reverse motors according to the detection signal of the position sensor.

[0010] By adopting the above technical solution and setting up "position sensors on the outside of the external control module and the trip unit body", the position sensors can detect the extension and retraction status of the push rod in real time and transmit the signal to the control module. The control module automatically controls the start, stop and direction of the forward and reverse motors according to the signal, without the need for manual intervention in motor operation, avoiding errors in manual control, realizing automatic triggering and precise control of the reset action, adapting to unattended industrial control scenarios, and further improving the automation level of the device.

[0011] Preferably, a pressing block is fixedly connected to the end of the connecting rod away from the hook. The pressing block has an arc-shaped or planar structure, and the end face of the pressing block corresponds to the free end of the top rod. When the connecting rod slides, it contacts the end of the top rod through the pressing block and applies a pressing force to avoid the connecting rod directly contacting the top rod and causing wear.

[0012] By adopting the above technical solution, by fixing a pressing block to the end of the connecting rod away from the hook, and the end face of the pressing block corresponding to the free end of the top rod: when the connecting rod slides, the pressing block replaces the connecting rod to directly contact the top rod and apply pressing force, avoiding hard friction between the connecting rod and the top rod, reducing the wear of both, extending the service life of the top rod and the connecting rod, reducing the frequency of component replacement, and improving the overall operational reliability of the device.

[0013] Preferably, a limiting ring is fixedly connected to the end of the threaded tube away from the forward and reverse motors. The outer diameter of the limiting ring is larger than the inner diameter of the threaded tube, which is used to limit the maximum travel of the threaded tube along the axial direction of the threaded tube and prevent the threaded tube from detaching from the threaded tube.

[0014] By adopting the above technical solution, a limiting ring is fixedly connected to the end of the threaded column away from the forward and reverse motors, and the outer diameter of the limiting ring is larger than the inner diameter of the threaded tube. The limiting ring can prevent the threaded tube from moving excessively along the axial direction of the threaded column, accurately limit the maximum travel of the threaded tube, prevent the threaded tube from detaching from the threaded column due to excessive travel, avoid transmission interruption leading to reset failure, and ensure the operational safety and reliability of the transmission mechanism.

[0015] Preferably, a slider is fixedly connected to the surface of the threaded tube, and a groove is provided inside the transmission chamber, with the slider movably connected inside the groove.

[0016] By adopting the above technical solution, a slider is fixed on the surface of the threaded tube, and a groove is opened inside the transmission chamber, so that the slider is movably connected in the groove: the cooperation between the slider and the groove can restrict the threaded tube to rotate synchronously with the threaded column, ensure that the threaded tube only moves along the axial direction of the threaded column, avoid the transmission deviation caused by the rotation of the threaded tube, ensure the accuracy of the threaded transmission, and further improve the stability of the reset action.

[0017] Preferably, the surface of the transmission compartment is provided with heat dissipation holes.

[0018] By adopting the above technical solution, heat dissipation holes are opened on the surface of the transmission chamber, and the heat generated by the forward and reverse motors during operation can be quickly dissipated outward through the heat dissipation holes, avoiding heat accumulation inside the transmission chamber, preventing the forward and reverse motors from malfunctioning due to overheating, ensuring the stable operation of the forward and reverse motors, extending the service life of the transmission mechanism, and avoiding interruption in the reset process due to motor overheating.

[0019] In summary, this application includes at least one of the following beneficial technical effects: This self-resetting trip unit completely solves the pain points of manual reset by using a "trip unit body with elastic components + transmission mechanism" to achieve fully automatic reset. During tripping, the push rod of the trip unit extends and pushes the circuit breaker connection device, simultaneously squeezing the internal elastic component to store potential energy. During reset, the forward and reverse motors drive the threaded column to rotate, driving the threaded tube to move axially. The hook pulls the connecting rod along the fixed frame through the hook, and the end of the connecting rod squeezes the push rod. Combined with the rebound assistance force of the elastic component, the push rod is pushed back, ultimately driving the trip unit body to reset. No manual operation is required inside the equipment, making it suitable for scenarios where large trip units are "hidden and in narrow spaces". It greatly improves reset efficiency, avoids the inconvenience and inefficiency of manual reset operation, and meets the needs of automated and efficient equipment operation. By employing a combination of a sliding groove, a slider, and a limiting ring, the system enhances reset stability and accuracy, preventing incomplete reset. The connecting rod passes through the sliding groove and is guided and restricted during sliding, moving only axially along the top rod to avoid deviation. When the threaded tube moves, the slider slides along the groove, restricting the threaded tube from rotating with the threaded column and ensuring that the threaded tube moves only axially. The limiting ring restricts the maximum travel of the threaded tube, preventing it from disengaging from the threaded column and causing transmission interruption. This avoids transmission deviation of the connecting rod and threaded tube, ensuring that the pressing block accurately presses the top rod. Combined with the auxiliary force of the elastic component, the top rod retracts into place, solving the problem of incomplete manual reset in existing technologies that affects the normal closing of the circuit breaker. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a partial three-dimensional structural schematic diagram of this application; Figure 3 This is a partial rear-view stereoscopic structural diagram of this application; Figure 4 This is a cross-sectional structural schematic diagram of the transmission mechanism of this application; Figure 5 for Figure 4 A schematic diagram of the structure at point A in the middle.

[0021] In the picture: 1. Trip unit body; 2. Top rod; 3. Fixing frame; 4. Connecting rod; 5. Hook; 6. Transmission mechanism; 601. Transmission chamber; 602. Forward and reverse motor; 603. Threaded column; 604. Threaded tube; 605. Pull hook; 606. Slider; 607. Slide groove; 7. Sliding groove; 8. Position sensor; 9. Pressing block; 10. Heat dissipation hole. Detailed Implementation

[0022] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0023] Example 1: A self-resetting trip unit, referring to... Figure 1 , Figure 2 and Figure 4 The trip unit includes a trip unit body 1 with an internal elastic component. The trip unit body 1, with its internal elastic component, is used to cooperate with the circuit breaker to release its holding mechanism. The trip unit body 1 has a push rod 2 that can extend and retract axially. When the push rod 2 extends, it pushes the circuit breaker's connecting device to achieve tripping. The elastic component inside the trip unit body 1 cooperates with the push rod 2 to store elastic potential energy when the push rod 2 extends and to provide a rebound assist force when the push rod 2 retracts. A fixing frame 3 is fixedly connected to the rear end of the trip unit body 1. A connecting rod 4 is slidably connected inside the fixing frame 3. A hook 5 is fixedly connected to one end of the connecting rod 4, and the other end of the connecting rod 4 corresponds to and cooperates with the push rod 2 of the trip unit body 1. A transmission mechanism 6 is provided on the side of the hook 5 away from the connecting rod 4. The transmission mechanism 6 includes a transmission chamber 601, and a forward and reverse motor 602 is fixedly connected inside the transmission chamber 601. A threaded post 603 is fixedly connected to the output end of motor 602. A threaded tube 604 is threadedly connected to the left end of the threaded post 603. A hook 605 is fixedly connected to the end of the threaded tube 604 away from the forward and reverse motors 602. The hook 605 is engaged with the hook 5. By setting up a trip unit body 1 with an internal elastic component, a fixing frame 3, a connecting rod 4, a hook 5, and a transmission mechanism 6, a complete "trip-reset" transmission chain is constructed: when tripping, the top rod 2 extends to disconnect the circuit breaker. When resetting, the forward and reverse motors 602 drive the threaded transmission, and the hook 605 and hook 5 drive the connecting rod 4 to squeeze the top rod 2. Combined with the rebound force of the elastic component, the reset is completed, completely replacing manual reset. This solves the problems of inconvenient and inefficient manual operation caused by the "hidden installation and narrow space" of large trip units, and meets the needs of automated equipment operation.

[0024] Reference Figure 1 , Figure 2 and Figure 3The fixing frame 3 has a sliding groove 7 inside, and the connecting rod 4 passes through the sliding groove 7 and slides in cooperation with the sliding groove 7. The hook 605 has a U-shaped structure, and the hook 5 has an L-shaped structure. The U-shaped opening of the hook 605 is engaged with the L-shaped bent end of the hook 5. The inner wall of the hook 605 has anti-slip protrusions at the contact part with the hook 5 to enhance the stability of the engagement and facilitate disassembly and separation. By opening the sliding groove 7 inside the fixing frame 3, the connecting rod 4 passes through and slides in the sliding groove 7. The sliding groove 7 can precisely limit the movement direction of the connecting rod 4, prevent the connecting rod 4 from deviating or shaking when sliding, and ensure that the connecting rod 4 is away from the hook 5. One end can be stably aligned with the top rod 2, providing precise guidance for subsequent pressing of the top rod 2, preventing incomplete reset due to misalignment of the connecting rod 4, and improving the stability and accuracy of the reset action. By setting the hook 605 as a U-shaped structure and the hook 5 as an L-shaped structure, and setting anti-slip protrusions on the inner wall of the hook 605: the cooperation between the U-shaped opening and the L-shaped bent end ensures tight connection and facilitates disassembly and maintenance; the anti-slip protrusions can increase the contact friction between the hook 605 and the hook 5, preventing them from separating due to force during reset transmission, which improves connection stability and reduces the difficulty of later maintenance, taking into account both transmission reliability and maintenance convenience.

[0025] Reference Figure 1 , Figure 2 and Figure 3 It also includes an external control module and a position sensor 8. The position sensor 8 is installed on the outside of the trip unit body 1 and is electrically connected to the control module to detect the extension and retraction of the push rod 2. The control module is also electrically connected to the forward and reverse motor 602 to control the start, stop, and direction of the forward and reverse motor 602 based on the detection signal from the position sensor 8. A pressing block 9 is fixedly connected to the end of the connecting rod 4 away from the hook 5. The pressing block 9 has an arc-shaped or flat structure, and its end face corresponds to the free end of the push rod 2. When the connecting rod 4 slides, it contacts the end of the push rod 2 through the pressing block 9 and applies a pressing force to avoid the connecting rod 4 directly contacting the push rod 2 and causing wear. By setting the "external control module and the position sensor 8 on the outside of the trip unit body 1", the position sensor 8 can detect the extension and retraction of the push rod 2 in real time. The system measures the extension and retraction status of the top rod 2 and transmits the signal to the control module. The control module automatically controls the start, stop, and direction of the forward and reverse motors 602 according to the signal, without the need for manual intervention in motor operation, avoiding errors caused by manual control, and realizing automatic triggering and precise control of the reset action. This is suitable for unattended industrial control scenarios and further improves the automation level of the device. By fixing the pressing block 9 to the end of the connecting rod 4 away from the hook 5, and the end face of the pressing block 9 corresponding to the free end of the top rod 2, when the connecting rod 4 slides, the pressing block 9 replaces the connecting rod 4 and directly contacts the top rod 2 and applies pressing force, avoiding hard friction between the connecting rod 4 and the top rod 2, reducing the amount of wear on both, extending the service life of the top rod 2 and the connecting rod 4, reducing the frequency of component replacement, and improving the overall operational reliability of the device.

[0026] Reference Figure 1 , Figure 4 and Figure 5 A limiting ring is fixedly connected to the end of the threaded column 603 away from the reversing motor 602. The outer diameter of the limiting ring is larger than the inner diameter of the threaded tube 604. This limiting ring restricts the maximum axial movement of the threaded tube 604 along the threaded column 603, preventing the threaded tube 604 from detaching from the threaded column 603. A slider 606 is fixedly connected to the surface of the threaded tube 604. A groove 607 is provided inside the transmission chamber 601, and the slider 606 is movably connected inside the groove 607. Heat dissipation holes 10 are provided on the surface of the transmission chamber 601. By fixing the limiting ring to the end of the threaded column 603 away from the reversing motor 602, and ensuring that the outer diameter of the limiting ring is larger than the inner diameter of the threaded tube 604, the limiting ring can prevent the threaded tube 604 from moving excessively along the axial direction of the threaded column 603. This precisely limits the maximum axial movement of the threaded tube 604, preventing the threaded tube 604 from detaching from the threaded column 603 due to excessive travel, avoiding transmission interruption and reset failure, and ensuring the smooth operation of the transmission. To ensure the operational safety and reliability of mechanism 6, a slider 606 is fixed to the surface of the threaded tube 604, and a groove 607 is opened inside the transmission chamber 601, allowing the slider 606 to be movably connected within the groove 607. The cooperation between the slider 606 and the groove 607 restricts the threaded tube 604 from rotating synchronously with the threaded column 603, ensuring that the threaded tube 604 moves only along the axial direction of the threaded column 603, preventing transmission offset caused by the rotation of the threaded tube 604, ensuring the accuracy of the threaded transmission, and further improving the stability of the reset action. By opening heat dissipation holes 10 on the surface of the transmission chamber 601, the heat generated by the forward and reverse motors 602 during operation can be quickly dissipated outward through the heat dissipation holes 10, preventing heat accumulation inside the transmission chamber 601, preventing the forward and reverse motors 602 from malfunctioning due to overheating, ensuring the stable operation of the forward and reverse motors 602, extending the service life of the transmission mechanism 6, and preventing interruption of the reset process due to motor overheating.

[0027] In this embodiment, the pain point of manual reset is completely solved by using "a trip unit body 1 with an elastic component + a transmission mechanism 6", achieving fully automatic reset. During tripping, the push rod 2 of the trip unit body 1 extends to push the circuit breaker connection device, simultaneously squeezing the internal elastic component to store potential energy. During reset, the forward and reverse motors 602 drive the threaded column 603 to rotate, driving the threaded tube 604 to move axially. The hook 605 pulls the connecting rod 4 along the fixed frame 3 through the hook 5. The end of the connecting rod 4 squeezes the push rod 2, and combined with the rebound auxiliary force of the elastic component, pushes the push rod 2 back, ultimately driving the trip unit body 1 to reset. No manual operation is required inside the equipment, which is suitable for scenarios where large trip units are "hidden and have narrow spaces", greatly improving reset efficiency and avoiding the problems of inconvenience and low efficiency of manual reset operation, thus meeting the needs of automated and efficient equipment operation. By using "sliding groove 7 + slider 606 and sliding groove 607 + limit ring", the stability and accuracy of reset are improved, and incomplete reset is avoided. The connecting rod 4 passes through the sliding groove 7 and is guided and restricted by the sliding groove 7 during sliding, moving only along the axial direction of the top rod 2 to avoid deviation. When the threaded tube 604 moves, the slider 606 slides along the sliding groove 607, restricting the threaded tube 604 from rotating with the threaded column 603, ensuring that the threaded tube 604 moves only axially. The limit ring restricts the maximum travel of the threaded tube 604 to prevent it from disengaging from the threaded column 603 and causing transmission interruption, avoiding transmission deviation of the connecting rod 4 and the threaded tube 604, ensuring that the pressing block 9 accurately presses the top rod 2, and the elastic component assists in the return of the top rod 2 to the correct position, solving the problem of incomplete manual reset in the existing technology, which affects the normal closing of the circuit breaker.

[0028] The implementation principle of this application embodiment is as follows: the elastic component inside the trip unit body 1 is in a naturally extended or slightly pre-compressed state, and its own push rod 2 is kept axially contracted and does not contact the circuit breaker connection device; the rear end of the trip unit body 1 is fixedly connected to the fixed frame 3, and the connecting rod 4 passes through the sliding groove 7 of the fixed frame 3 and is in the initial sliding position; the hook 5 at one end of the connecting rod 4 is stably engaged with the pull hook 605 of the threaded tube 604 in the transmission mechanism 6, and the anti-slip protrusion on the inner wall of the pull hook 605 fits against the hook 5; in the transmission chamber 601 of the transmission mechanism 6, the forward and reverse motor 602 is in a stopped state, the slider 606 on the surface of the threaded tube 604 is located at the initial end of the sliding groove 607 of the transmission chamber 601, and the limiting ring at the end of the threaded column 603 away from the forward and reverse motor 602 does not contact the threaded tube 604. The external control module and the position sensor 8 on the outside of the trip unit body 1 are in standby mode, and the position sensor 8 monitors the position of the push rod 2 in real time. When the circuit malfunctions: the trip unit body 1 is energized, and the internal electromagnetic force overcomes the elastic force of the elastic component, pushing the push rod 2 to extend axially. The extended push rod 2 directly pushes the circuit breaker linkage device, releasing the circuit breaker holding mechanism, causing the circuit breaker to automatically disconnect and complete the trip protection. During this process, the push rod 2 simultaneously squeezes the elastic component inside the trip unit body 1, and the elastic component contracts and stores elastic potential energy, preparing for subsequent reset. The position sensor 8 detects that the push rod 2 is in the extended state and immediately transmits the detection signal to the external control module. After receiving the signal, the control module sends a signal to the forward and reverse motor 602 of the transmission mechanism 6 according to the preset logic. A start command is sent to control the forward and reverse motors 602 to rotate in the forward direction; the output end of the forward and reverse motors 602 drives the threaded column 603 to rotate synchronously; because the threaded tube 604 is threadedly connected to the threaded column 603, and the slider 606 on the surface of the threaded tube 604 is fitted into the slide groove 607 of the transmission chamber 601, the threaded tube 604 moves along the axial direction of the threaded column 603; when the threaded tube 604 moves, the hook 605 at its end pulls the hook 5 synchronously, and the hook 5 drives the connecting rod 4 to slide axially along the sliding groove 7 of the fixed frame 3. The end of the connecting rod 4 away from the hook 5 moves synchronously, and its fixed pressing block 9 gradually contacts the free end of the top rod 2 and applies axial pressing force to the top rod 2; the top rod 2 is subjected to the pressing force of the pressing block 9 and the rebound auxiliary force of the elastic component inside the trip unit body 1. Under the combined action, the device retracts axially into the release unit body 1. During this process, the limiting ring of the threaded post 603 restricts the maximum travel of the threaded tube 604, preventing the threaded tube 604 from disengaging from the threaded post 603. At the same time, the heat dissipation holes 10 on the surface of the transmission chamber 601 dissipate the heat generated by the operation of the forward and reverse motors 602 to the outside, preventing the motor from overheating. When the push rod 2 retracts to the initial retracted position, the position sensor 8 detects the reset signal and transmits it to the control module. The control module sends a stop command, the forward and reverse motors 602 stop rotating, and the threaded tube 604 and the hook 605 stop moving. The elastic components inside the release unit body 1 return to their natural extended state, and the connecting rod 4 and the hook 5 remain stationary with the release unit body 1. The entire device returns to its initial working state, waiting for the next release command.

Claims

1. A self-resetting trip unit, mechanically coupled with a circuit breaker to achieve automatic circuit breaker disconnection and trip unit reset, characterized in that, The circuit breaker includes a trip unit body (1) with an internal elastic component. The trip unit body (1) with the internal elastic component is used to cooperate with the circuit breaker to release its holding mechanism. The trip unit body (1) has a push rod (2) that can extend and retract axially. When the push rod (2) extends, it can push the circuit breaker connection device to achieve tripping. The elastic component inside the trip unit body (1) cooperates with the push rod (2) to store elastic potential energy when the push rod (2) extends and to provide a rebound assist force when the push rod (2) retracts. A fixed frame (3) is fixedly connected to the rear end of the trip unit body (1). A connecting rod (4) is slidably connected inside the fixed frame (3). One end of the connecting rod (4) is fixedly connected to a hanging device. The hook (5) is connected to the top rod (2) of the release device body (1) at the other end of the connecting rod (4). A transmission mechanism (6) is provided on the side of the hook (5) away from the connecting rod (4). The transmission mechanism (6) includes a transmission chamber (601). A forward and reverse motor (602) is fixedly connected inside the transmission chamber (601). A threaded column (603) is fixedly connected to the output end of the forward and reverse motor (602). A threaded tube (604) is threadedly connected to the left end of the threaded column (603). A pull hook (605) is fixedly connected to the end of the threaded tube (604) away from the forward and reverse motor (602). The pull hook (605) is engaged with the hook (5).

2. The self-resetting trip unit according to claim 1, characterized in that: The fixed frame (3) has a sliding groove (7) inside, and the connecting rod (4) passes through the sliding groove (7) and slides in cooperation with the sliding groove (7).

3. A self-resetting trip unit according to claim 1, characterized in that: The hook (605) has a U-shaped structure and the hook (5) has an L-shaped structure. The U-shaped opening of the hook (605) is engaged with the L-shaped bent end of the hook (5). The inner wall of the hook (605) is provided with anti-slip protrusions at the contact part with the hook (5) to enhance the stability of the engagement and facilitate disassembly and separation.

4. A self-resetting trip unit according to claim 1, characterized in that, It also includes an external control module and a position sensor (8). The position sensor (8) is installed on the outside of the trip unit body (1) and is electrically connected to the control module. It is used to detect the extension and retraction of the push rod (2). The control module is electrically connected to the forward and reverse motor (602) and is used to control the start, stop and direction of the forward and reverse motor (602) according to the detection signal of the position sensor (8).

5. A self-resetting trip unit according to claim 1, characterized in that: The end of the connecting rod (4) away from the hook (5) is fixedly connected to a pressing block (9). The pressing block (9) is an arc-shaped or planar structure. The end face of the pressing block (9) corresponds to the free end of the top rod (2). When the connecting rod (4) slides, it contacts the end of the top rod (2) through the pressing block (9) and applies a pressing force to avoid the connecting rod (4) directly contacting the top rod (2) and causing wear.

6. A self-resetting trip unit according to claim 1, characterized in that: The end of the threaded column (603) away from the forward and reverse motor (602) is fixedly connected to a limiting ring. The outer diameter of the limiting ring is larger than the inner diameter of the threaded tube (604). The limiting ring is used to limit the maximum travel of the threaded tube (604) along the axial direction of the threaded column (603) and prevent the threaded tube (604) from detaching from the threaded column (603).

7. A self-resetting trip unit according to claim 1, characterized in that: A slider (606) is fixedly connected to the surface of the threaded tube (604), and a groove (607) is provided inside the transmission chamber (601). The slider (606) is movably connected inside the groove (607).

8. A self-resetting trip unit according to claim 1, characterized in that: The transmission compartment (601) has heat dissipation holes (10) on its surface.

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