A small circuit breaker opening and closing mechanism

Abstract

The present invention discloses a small circuit breaker opening and closing mechanism. The opening and closing mechanism and the small circuit breaker are detachable. The opening and closing mechanism includes a housing, in which are arranged a fan-shaped closing gear, a double-layer special-shaped reduction closing transmission gear, a worm, a reduction motor, a tripping lever, a push-pull electromagnet, a linkage shaft between the circuit breaker opening and closing handle and the fan-shaped closing gear, a fan-shaped closing gear closing position sensor, a fan-shaped closing gear opening position sensor, and a double-layer special-shaped reduction closing transmission gear position sensor. When the small circuit breaker automatic opening and closing mechanism performs the closing operation, the reduction motor drives the worm to drive the double-layer special-shaped reduction closing transmission gear to drive the fan-shaped closing gear to rotate, thereby completing the circuit breaker closing operation. Compared with the traditional closing transmission using multiple reduction gear sets, the present technical solution requires fewer parts for transmission, has a simple and compact structure, high stability, and less friction between parts, resulting in high transmission efficiency.

Description

Technical Field

[0001] The invention relates to an opening and closing mechanism of a small circuit breaker, which can be used in the technical field of small switch controllers. Background Art

[0002] Intelligent miniature switch controllers are widely used in various fields, including homes, businesses, and industries. Common examples include automatic reclosing devices and smart switches. Currently, electronic automatic reclosing devices use relays as the main circuit breaker. However, due to the relay's insufficient breaking capacity, it may not open in the event of a short circuit. Therefore, it must be used in conjunction with a circuit breaker (CIB). This has led to a surge in research into mechanical reclosing devices, specifically intelligent circuit breakers that combine a miniature circuit breaker with an actuator and electronic components.

[0003] The intelligent circuit breaker actuators currently on the market use a motor to drive the reduction gear set in forward and reverse rotation to drive the handle to open and close the switch. When performing the opening operation, it takes a long time for the motor to start and drive the reduction gear set to drive the handle to the opening position. When the lower circuit of the switch requires immediate opening protection, this solution cannot meet the application requirements. If opening protection is required immediately after closing the switch, it is easy for the transmission mechanism to get stuck or the gears to break when switching in the reverse direction. In addition, due to the multi-stage reduction of the gear set, many parts are required, the matching requirements between the parts are high, it is easy to malfunction, and the size is large. Once stuck or the gears break, the switch will not be able to open and close effectively, and human intervention cannot open and close the switch, and professional personnel must be present to replace it. Therefore, it has become an urgent problem to study an automatic opening and closing mechanism that is simple and efficient to operate to solve the problems raised in the above background technology. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems existing in the prior art and to provide an opening and closing mechanism for a miniature circuit breaker.

[0005] The object of the present invention is achieved by the following technical solutions: a small circuit breaker opening and closing mechanism, the opening and closing mechanism and the small circuit breaker are detachable, the opening and closing mechanism includes a housing, the housing is provided with a sector-shaped closing gear, a double-layer special-shaped reduction closing transmission gear, a worm, a reduction motor, a tripping lever, a push-pull electromagnet, a linkage shaft between the opening and closing handle of the linkage circuit breaker and the sector-shaped closing gear, a sector-shaped closing gear closing position sensor, a sector-shaped closing gear opening position sensor, and a double-layer special-shaped reduction closing transmission gear position sensor,

[0006] The worm is fixed on the output shaft of the reduction motor, the reduction motor drives the worm to rotate, the worm drives the double-layer special-shaped reduction closing transmission gear to rotate, the double-layer special-shaped reduction closing transmission gear drives the fan-shaped closing gear to rotate, the fan-shaped closing gear drives the linkage shaft of the circuit breaker opening and closing handle and the fan-shaped closing gear to rotate, the double-layer special-shaped reduction closing transmission gear is sleeved on the fixed shaft of the double-layer special-shaped reduction closing transmission gear, and the double-layer special-shaped reduction closing transmission gear is in meshing relationship with the worm;

[0007] The double-layer special-shaped deceleration closing transmission gear is provided with a first boss and a groove to cooperate with the double-layer special-shaped deceleration closing transmission gear position sensor. The gear rotation position is checked by whether the boss presses the detection knob of the sensor; the sector closing gear is connected to the linkage shaft of the circuit breaker opening and closing handle and the sector closing gear, and the other end of the transmission shaft is connected to the circuit breaker opening and closing handle. The circuit breaker opening and closing handle is rotated by the rotation of the sector closing gear to achieve closing.

[0008] The housing also includes a control circuit board, and the sector-shaped closing gear closing position sensor, the sector-shaped closing gear opening position sensor and the double-layer special-shaped reduction closing transmission gear position sensor are electrically connected to the control circuit board.

[0009] Preferably, the reduction motor is fixed on the housing, the worm on the reduction motor output shaft is fixed on the reduction motor output shaft, the worm on the reduction motor output shaft is meshed with the large gear on the double-layer special-shaped reduction closing transmission gear, and the small gear on the double-layer special-shaped reduction closing transmission gear can mesh in, mesh in, and mesh out with the fan-shaped closing gear, thereby driving the fan-shaped closing gear to rotate.

[0010] Preferably, a second boss is provided on the sector closing gear to cooperate with the sector closing gear closing position sensor and the sector closing gear opening position sensor, and the rotation position of the sector closing gear is detected by whether the second boss on the gear presses the detection handle of the sector closing gear closing position sensor or the sector closing gear opening position sensor.

[0011] Preferably, the trip lever is arranged at the position of the circuit breaker tripper, one end of the trip lever is fixed to the housing for rotational movement, and the other end cooperates with the circuit breaker tripper, and the trip lever trips and opens the circuit breaker by rotating the trip lever.

[0012] Preferably, the push-pull electromagnet is fixed on the housing, and the iron core of the push-pull electromagnet pushes the trip lever to rotate and trip the circuit breaker tripper to open the circuit breaker.

[0013] Preferably, there is a height difference between the upper surface of the first boss and the upper surface of the groove, and the height difference is H, where H>the protruding height of the detection knob or the stroke height of the handle.

[0014] Preferably, when the groove moves to the relative position of the detection handle of the double-layer special-shaped deceleration closing transmission gear position sensor, the groove does not contact the handle, the handle is in the initial state, and the output state of the sensor is not pressed down, that is, the initial state, so that when the first boss moves to the relative position of the detection handle of the double-layer special-shaped deceleration closing transmission gear position sensor, the handle is pressed down by the first boss, and the output state of the sensor changes.

[0015] Preferably, when the circuit breaker is in the open state, when the control circuit board issues a closing command, the automatic opening and closing mechanism of the small circuit breaker starts to perform the closing operation, the reduction motor rotates, driving the worm on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped reduction closing transmission gear to rotate counterclockwise, the small gear on the double-layer special-shaped reduction closing transmission gear rotates to engage with the fan-shaped closing gear, driving the fan-shaped closing gear to rotate clockwise, the rotation of the fan-shaped closing gear drives the circuit breaker opening and closing handle to rotate through the linkage shaft of the circuit breaker opening and closing handle and the fan-shaped closing gear to realize circuit breaker closing, and the closing stroke ends;

[0016] The pinion on the double-layer special-shaped reduction closing transmission gear is disengaged from the sector-shaped closing gear, and the double-layer special-shaped reduction closing transmission gear rotates to the initial position and stops. At this time, the pinion on the double-layer special-shaped reduction closing transmission gear has no meshing relationship with the sector-shaped closing gear, and the sector-shaped closing gear can rotate freely. At this time, the circuit breaker can be manually operated to open and close.

[0017] Preferably, when the circuit breaker is in the closed state, when the control circuit board of the automatic opening and closing mechanism of the small circuit breaker issues an opening command, the automatic opening and closing mechanism of the small circuit breaker starts to perform the opening operation, the push-pull electromagnet coil is energized, and the electromagnet core makes a pushing motion to push the tripping lever to rotate and toggle the tripping mechanism on the circuit breaker to trip and complete the opening action within milliseconds. After the opening action is completed, the iron core of the push-pull electromagnet returns to its position, and the tripping lever returns to its position.

[0018] Preferably, each time the opening and closing mechanism is powered on, the double-layer special-shaped reduction closing transmission gear position sensor is used to detect whether the double-layer special-shaped reduction closing transmission gear is in the set initial position. If it is not in the set initial position, the reduction motor drives the worm on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped reduction closing transmission gear to rotate to the set initial position. The fan-shaped closing gear closing position sensor and the fan-shaped closing gear opening position sensor continuously monitor the fan-shaped closing gear closing position, realizing real-time status monitoring and motion closed-loop control. The advantages of the technical solution of the present invention are mainly reflected in: the structure can solve the technical problems of the circuit breaker opening and closing mechanism in the prior art, such as large size, complex structure, and easy jamming of the mechanism.

[0019] When the automatic opening and closing mechanism of this miniature circuit breaker performs the closing operation, a reduction motor drives a worm to drive a double-layer special-shaped reduction closing transmission gear, which in turn rotates a sector-shaped closing gear to complete the circuit breaker closing operation. Compared with traditional closing transmissions using multiple reduction gear sets, this technical solution requires fewer transmission parts, has a simple and compact structure, high stability, and low friction between parts, resulting in high transmission efficiency. The closing actuator of this technical solution uses a worm gear and worm to rotate, resulting in a high transmission ratio and high output torque, capable of driving a four-stage miniature circuit breaker to complete the closing operation.

[0020] The closing mechanism, driven by a worm driven by a reduction motor and a double-layered, special-shaped reduction closing gear, drives the fan-shaped closing gear. All moving parts only move in one direction, eliminating the risk of gear jamming caused by switching in the opposite direction. Position detection devices are installed on both the double-layered, special-shaped reduction closing gear and the fan-shaped closing gear to achieve closed-loop motion control.

[0021] When the automatic opening and closing mechanism of this miniature circuit breaker performs an opening operation, a push-pull electromagnet pushes the trip lever, rotating it and tripping the circuit breaker's trip mechanism, completing the opening operation. This magnetic flux-based opening mechanism allows for rapid opening at millisecond speeds, eliminating the slow opening speeds associated with motor-driven gear-driven opening mechanisms.

[0022] The closing mechanism and opening mechanism in this technical solution are two independent mechanisms. Therefore, if opening protection is required immediately when closing, this technical solution can perform the opening operation through the opening mechanism, and there will be no accident caused by the inability to perform opening protection when it is required at the moment of closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a schematic diagram of the assembly structure of a miniature circuit breaker and an opening and closing mechanism of the present invention.

[0024] Figure 2 The figure is a structural schematic diagram of an opening and closing mechanism of a miniature circuit breaker of the present invention.

[0025] Figure 3 The figure is a structural schematic diagram of an opening and closing mechanism of a miniature circuit breaker of the present invention.

[0026] Figure 4 The figure is a structural schematic diagram of an opening and closing mechanism of a miniature circuit breaker of the present invention.

[0027] Figure 5 The figure is a structural schematic diagram of an opening and closing mechanism of a miniature circuit breaker of the present invention.

[0028] Figure 6 It is a front view of the sector closing gear of the present invention.

[0029] Figure 7It is a front view of the sector closing gear of the present invention.

[0030] Figure 8 It is a rear view of the double-layer special-shaped reduction closing transmission gear of the present invention.

[0031] Figure 9 This is a front view of the double-layer special-shaped reduction closing transmission gear of the present invention. DETAILED DESCRIPTION

[0032] The objects, advantages, and features of the present invention are illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of the application of the technical solutions of the present invention, and any technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

[0033] The present invention discloses a small circuit breaker opening and closing mechanism, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, the opening and closing mechanism and the small circuit breaker are detachably arranged, and the opening and closing mechanism includes a shell 2, in which a fan-shaped closing gear 3, a double-layer special-shaped reduction closing transmission gear 4, a worm 5, a reduction motor 6, a tripping lever 7, a push-pull electromagnet 8, a linkage shaft 9 between the opening and closing handle of the linkage circuit breaker and the fan-shaped closing gear, a fan-shaped closing gear closing position sensor 10, a fan-shaped closing gear opening position sensor 11, and a double-layer special-shaped reduction closing transmission gear position sensor 12 are arranged.

[0034] The worm 5 is fixed on the output shaft of the reduction motor 6, and the reduction motor 6 drives the worm 5 to rotate, and the worm 5 drives the double-layer special-shaped reduction closing transmission gear 4 to rotate, and the double-layer special-shaped reduction closing transmission gear 4 drives the fan-shaped closing gear 3 to rotate, and the fan-shaped closing gear 3 drives the linkage shaft 9 of the linkage circuit breaker opening and closing handle and the fan-shaped closing gear to rotate, and the double-layer special-shaped reduction closing transmission gear 4 is sleeved on the fixed shaft 100 of the double-layer special-shaped reduction closing transmission gear, and the double-layer special-shaped reduction closing transmission gear 4 is in a meshing relationship with the worm 5.

[0035] like Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, the double-layered, special-shaped deceleration closing transmission gear 4 is provided with a first boss 40 and a groove 41 that cooperate with the double-layered, special-shaped deceleration closing transmission gear position sensor 12. The gear rotation position is verified by whether the boss presses against the sensor's detection knob. The sector closing gear 3 is connected to the linkage shaft 9 of the circuit breaker's opening and closing handle and the sector closing gear. The other end of the transmission shaft is connected to the circuit breaker's opening and closing handle. The rotation of the sector closing gear 3 drives the circuit breaker's opening and closing handle to achieve closing.

[0036] The housing also includes a control circuit board, and the sector-shaped closing gear closing position sensor 10, the sector-shaped closing gear opening position sensor 11 and the double-layer special-shaped reduction closing transmission gear position sensor 12 are electrically connected to the control circuit board.

[0037] The reduction motor 6 is fixed on the housing 2, and the worm 5 on the output shaft of the reduction motor is fixed on the output shaft of the reduction motor. The worm 5 on the output shaft of the reduction motor is engaged with the large gear on the double-layer special-shaped reduction closing transmission gear 4, and the small gear on the double-layer special-shaped reduction closing transmission gear 4 can mesh with the sector-shaped closing gear 3, thereby driving the sector-shaped closing gear 3 to rotate.

[0038] The sector closing gear 3 is connected to the linkage shaft 9 of the circuit breaker opening and closing handle and the sector closing gear. The other end of the transmission shaft is connected to the circuit breaker opening and closing handle. The circuit breaker opening and closing handle is rotated by the rotation of the sector closing gear 3 to achieve closing.

[0039] The double-layered, special-shaped deceleration closing transmission gear 4 is equipped with a first boss 40 and a groove 41, which cooperate with the double-layered, special-shaped deceleration closing transmission gear position sensor 12. The gear rotational position is verified by whether the boss presses against the sensor's detection knob. The sector closing gear 3 is connected to the linkage shaft 9 of the circuit breaker's opening and closing handle and the sector closing gear. The other end of the transmission shaft is connected to the circuit breaker's opening and closing handle. The rotation of the sector closing gear 3 drives the circuit breaker's opening and closing handle to achieve closing.

[0040] The housing also includes a control circuit board, and the sector-shaped closing gear closing position sensor 10, the sector-shaped closing gear opening position sensor 11 and the double-layer special-shaped reduction closing transmission gear position sensor 12 are electrically connected to the control circuit board.

[0041] A boss is provided on the sector closing gear 3 to cooperate with the sector closing gear closing position sensor 10 and the sector closing gear opening position sensor 11. The rotation position of the sector closing gear 3 is detected by whether the boss on the gear presses the detection handle of the sector closing gear closing position sensor 10 or the sector closing gear opening position sensor 11.

[0042] A trip lever 7 is positioned at the circuit breaker's trip unit. One end is fixed to housing 2 and can rotate. The other end engages the circuit breaker's trip unit. Rotating the trip lever 7 causes the circuit breaker's trip unit to trip and open. A push-pull electromagnet 8 is fixed to housing 2. The push-pull electromagnet's core pushes the trip lever 7, rotating it and opening the circuit breaker.

[0043] The reduction motor 6, the double-layer special-shaped reduction closing transmission gear position sensor 12, the sector-shaped closing gear closing position sensor 10, and the sector-shaped closing gear opening position sensor 11 are electrically connected to the control circuit board of the automatic opening and closing mechanism of the miniature circuit breaker (not shown in the figure).

[0044] When the circuit breaker is in the open state, when the control circuit board of the automatic opening and closing mechanism of the small circuit breaker issues a closing command, the automatic opening and closing mechanism of the small circuit breaker starts to perform the closing operation, the reduction motor 6 rotates, driving the worm on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped reduction closing transmission gear 4 to rotate counterclockwise, and the small gear on the double-layer special-shaped reduction closing transmission gear 4 rotates and engages with the fan-shaped closing gear 3 to drive the fan-shaped closing gear 3 to rotate clockwise, and the rotation of the fan-shaped closing gear 3 drives the circuit breaker opening and closing handle to rotate through the linkage shaft of the circuit breaker opening and closing handle and the fan-shaped closing gear 3 to realize circuit breaker closing. At the end of the closing stroke, the small gear on the double-layer special-shaped reduction closing transmission gear 4 is meshed and disengaged from the fan-shaped closing gear 3, and the double-layer special-shaped reduction closing transmission gear 4 rotates to the initial position and stops. At this time, the small gear on the double-layer special-shaped reduction closing transmission gear 4 has no meshing relationship with the fan-shaped closing gear 3, and the fan-shaped closing gear 3 can rotate freely. At this time, the circuit breaker can be manually opened and closed.

[0045] When the circuit breaker is in the closed state, the automatic opening and closing mechanism of the miniature circuit breaker controls the circuit board to issue an opening command. The automatic opening and closing mechanism of the miniature circuit breaker begins to open. The push-pull electromagnet coil is energized, and the electromagnet core pushes out, pushing the trip lever 7 and rotating it, tripping the trip mechanism on the circuit breaker. The opening operation is completed within milliseconds. After the opening action is completed, the push-pull electromagnet core returns to its original position, and the trip lever 7 returns to its original position, without affecting the next closing of the circuit.

[0046] Each time the automatic opening and closing mechanism is powered on, the double-layer special-shaped reduction gear closing transmission gear position sensor 12 detects whether the double-layer special-shaped reduction gear closing transmission gear is in the set initial position. If not, the reduction motor 6 drives the worm on the reduction motor output shaft to rotate the double-layer special-shaped reduction gear closing transmission gear 4 to the set initial position. The sector closing gear closing position sensor 10 and the sector closing gear opening position sensor 11 continuously monitor the sector closing gear closing position, enabling real-time status monitoring and closed-loop motion control.

[0047] When the automatic opening and closing mechanism of the small circuit breaker performs the closing operation, the reduction motor 6 rotates, driving the worm 5 on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped reduction closing transmission gear 4 to rotate, and the small gear on the double-layer special-shaped reduction closing transmission gear rotates and engages with the fan-shaped closing gear 3 to drive the fan-shaped closing gear 3 to rotate. The rotation of the fan-shaped closing gear 3 drives the circuit breaker opening and closing handle to rotate through the linkage shaft 9 of the circuit breaker opening and closing handle and the fan-shaped closing gear to close the circuit breaker. At the end of the closing stroke, the small gear on the double-layer special-shaped reduction closing transmission gear 4 is meshed with the fan-shaped closing gear 3, and the double-layer special-shaped reduction closing transmission gear 4 rotates to the initial position and stops. At this time, the small gear on the double-layer special-shaped reduction closing transmission gear 4 has no meshing relationship with the fan-shaped closing gear 3, and the circuit breaker can be manually opened and closed.

[0048] When the automatic opening and closing mechanism of a miniature circuit breaker performs an opening operation, the core of the push-pull electromagnet 8 pushes out, pushing the trip lever 7, rotating the trip mechanism on the circuit breaker and tripping the circuit breaker, completing the opening operation. After the opening operation is completed, the core of the push-pull electromagnet returns to its original position, and the trip lever returns to its original position, without affecting the next closing operation.

[0049] Each time the control mechanism is powered on, the double-layer special-shaped reduction closing transmission gear position sensor 12 detects whether the double-layer special-shaped reduction closing transmission gear 4 is in the set initial position. If it is not in the set initial position, the reduction motor 6 drives the worm on the reduction motor output shaft to rotate, driving the double-layer special-shaped reduction closing transmission gear 4 to rotate to the set initial position.

[0050] This structure solves the technical problems of existing circuit breaker opening and closing mechanisms, such as large size, complex structure, and easy jamming. When the automatic opening and closing mechanism of this small circuit breaker performs the closing operation, the reduction motor drives the worm to drive the double-layer special-shaped reduction closing transmission gear, which drives the fan-shaped closing gear to complete the circuit breaker closing operation.

[0051] Compared to traditional closing mechanisms using multiple reduction gear sets, this solution requires fewer parts, offers a simpler and more compact structure, greater stability, and reduced friction between components, resulting in high transmission efficiency and lower costs, making it suitable for widespread industrial adoption. The closing actuator in this solution utilizes a worm gear and worm, resulting in a high transmission ratio and high output torque, capable of driving a four-stage miniature circuit breaker to complete the closing action.

[0052] The closing mechanism, driven by a worm driven by a reduction motor and a double-layered, special-shaped reduction closing gear, drives the fan-shaped closing gear. All moving parts only move in one direction, eliminating the risk of gear jamming caused by switching in the opposite direction. Position detection devices are installed on both the double-layered, special-shaped reduction closing gear and the fan-shaped closing gear to achieve closed-loop motion control.

[0053] During the tripping operation, the push-pull electromagnet pushes the trip lever, rotating it to trip the trip mechanism on the circuit breaker, completing the tripping operation. Using magnetic flux to trip the circuit breaker offers a simple structure, high reliability, and rapid operation, making the protection operation more efficient and reliable.

[0054] When the automatic opening and closing mechanism of this miniature circuit breaker performs an opening operation, a push-pull electromagnet pushes the trip lever, rotating it and tripping the circuit breaker's trip mechanism, completing the opening operation. This magnetic flux-based opening mechanism allows for rapid opening at millisecond speeds, eliminating the slow opening speeds associated with motor-driven gear-driven opening mechanisms.

[0055] The closing mechanism and opening mechanism in this technical solution are two independent mechanisms. Therefore, if opening protection is required immediately when closing, this technical solution can perform the opening operation through the opening mechanism, and there will be no accident caused by the inability to perform opening protection when it is required at the moment of closing.

[0056] The present invention has multiple implementation modes, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A small circuit breaker opening and closing mechanism, characterized by: The opening and closing mechanism and the miniature circuit breaker are detachable. The opening and closing mechanism comprises a housing (2), wherein a fan-shaped closing gear (3), a double-layer special-shaped deceleration closing transmission gear (4), a worm (5), a reduction motor (6), a tripping lever (7), a push-pull electromagnet (8), a linkage shaft (9) between the opening and closing handle of the linkage circuit breaker and the fan-shaped closing gear, a fan-shaped closing gear closing position sensor (10), a fan-shaped closing gear opening position sensor (11), and a double-layer special-shaped deceleration closing transmission gear position sensor (12) are arranged in the housing, wherein the worm (5) is fixed to the reduction motor (6). On the output shaft, the reduction motor (6) drives the worm (5) to rotate, the worm (5) drives the double-layer special-shaped reduction closing transmission gear (4) to rotate, the double-layer special-shaped reduction closing transmission gear (4) drives the fan-shaped closing gear (3) to rotate, the fan-shaped closing gear (3) drives the linkage shaft (9) of the linkage circuit breaker opening and closing handle and the fan-shaped closing gear to rotate, the double-layer special-shaped reduction closing transmission gear (4) is sleeved on the fixed shaft (100) of the double-layer special-shaped reduction closing transmission gear, and the double-layer special-shaped reduction closing transmission gear (4) and the worm (5) are in a meshing relationship; A first boss (40) and a groove (41) are provided on the double-layer special-shaped deceleration closing transmission gear (4) to cooperate with the double-layer special-shaped deceleration closing transmission gear position sensor (12), and the gear rotation position is checked by whether the boss presses the detection knob of the sensor; the sector closing gear (3) is connected to the linkage shaft (9) of the circuit breaker opening and closing handle and the sector closing gear, and the other end of the transmission shaft is connected to the circuit breaker opening and closing handle, and the circuit breaker opening and closing handle is driven to rotate by the rotation of the sector closing gear (3) to achieve closing; The housing further includes a control circuit board, and the fan-shaped closing gear closing position sensor (10), the fan-shaped closing gear opening position sensor (11) and the double-layer special-shaped reduction closing transmission gear position sensor (12) are electrically connected to the control circuit board; a second boss (30) is provided on the fan-shaped closing gear (3) to cooperate with the fan-shaped closing gear closing position sensor (10) and the fan-shaped closing gear opening position sensor (11), and the rotation position of the fan-shaped closing gear (3) is detected by whether the second boss (30) on the gear presses the detection handle of the fan-shaped closing gear closing position sensor (10) or the fan-shaped closing gear opening position sensor (11); the push-pull electromagnet (8) is fixed on the housing (2), and the iron core of the push-pull electromagnet performs a pushing motion to push the tripping lever (7) to rotate and toggle the circuit breaker tripper to trip the circuit breaker and open the circuit breaker; When the groove (41) moves to the relative position of the detection handle of the double-layer special-shaped deceleration closing transmission gear position sensor (12), the groove does not contact the handle, the handle is in the initial state, and the output state of the sensor is not pressed down, that is, the initial state, so that when the first boss (40) moves to the relative position of the detection handle of the double-layer special-shaped deceleration closing transmission gear position sensor (12), the handle is pressed down by the first boss (40), and the output state of the sensor changes.

2. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: The reduction motor (6) is fixed on the housing (2), and the worm (5) on the output shaft of the reduction motor is fixed on the output shaft of the reduction motor. The worm (5) on the output shaft of the reduction motor meshes with the large gear on the double-layer special-shaped reduction closing transmission gear (4), and the small gear on the double-layer special-shaped reduction closing transmission gear (4) can mesh with the fan-shaped closing gear (3), thereby driving the fan-shaped closing gear (3) to rotate.

3. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: The trip lever (7) is arranged at the position of the circuit breaker tripper, one end of the trip lever (7) is fixed to the housing (2) for rotational movement, and the other end cooperates with the circuit breaker tripper, and the trip lever (7) is rotated to trip the circuit breaker tripper.

4. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: There is a height difference between the upper surface of the first boss (40) and the upper surface of the groove (41), and the height difference is H, where H>the protruding height of the detection knob or the stroke height of the handle.

5. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: When the circuit breaker is in the open state, when the control circuit board issues a closing command, the automatic opening and closing mechanism of the small circuit breaker starts to perform the closing operation, the reduction motor (6) rotates, driving the worm on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped reduction closing transmission gear (4) to rotate counterclockwise, the small gear on the double-layer special-shaped reduction closing transmission gear (4) rotates and engages with the fan-shaped closing gear (3) to drive the fan-shaped closing gear (3) to rotate clockwise, the fan-shaped closing gear (3) rotates through the linkage shaft of the circuit breaker opening and closing handle and the fan-shaped closing gear (3) to drive the circuit breaker opening and closing handle to rotate to realize circuit breaker closing, and the closing stroke ends; The small gear on the double-layer special-shaped deceleration closing transmission gear (4) is meshed and disengaged from the fan-shaped closing gear (3), and the double-layer special-shaped deceleration closing transmission gear (4) rotates to the initial position and stops. At this time, the small gear on the double-layer special-shaped deceleration closing transmission gear (4) has no meshing relationship with the fan-shaped closing gear (3), and the fan-shaped closing gear (3) can rotate freely. At this time, the circuit breaker can be manually operated to open and close.

6. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: When the circuit breaker is in the closed state, the control circuit board of the automatic opening and closing mechanism of the small circuit breaker issues an opening command, and the automatic opening and closing mechanism of the small circuit breaker starts to perform the opening operation. The push-pull electromagnet coil is energized, and the electromagnet core performs a pushing motion to push the tripping lever (7) to rotate and toggle the tripping mechanism on the circuit breaker to complete the opening action within milliseconds. After the opening action is completed, the iron core of the push-pull electromagnet returns to its original position, and the tripping lever (7) returns to its original position.

7. The opening and closing mechanism of a miniature circuit breaker according to claim 1, characterized in that: Each time the opening and closing mechanism is powered on, the double-layer special-shaped deceleration closing transmission gear position sensor (12) detects whether the double-layer special-shaped deceleration closing transmission gear is in the set initial position. If it is not in the set initial position, the reduction motor (6) drives the worm on the output shaft of the reduction motor to rotate, driving the double-layer special-shaped deceleration closing transmission gear (4) to rotate to the set initial position. The fan-shaped closing gear closing position sensor (10) and the fan-shaped closing gear opening position sensor (11) continuously monitor the closing position of the fan-shaped closing gear, thereby realizing real-time status monitoring and motion closed-loop control.

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