Electric driving mechanism and all-electric combined circuit breaker
By designing the electric drive mechanism and control system, the automatic operation of the circuit breaker is achieved and the grounding switch is solved, and the safety hazards of manual operation and the complexity of the interlocking mechanism are achieved, and a high-safety, simple and reliable fully electric combined circuit breaker is realized.
Patent Information
- Application Number
- CN202421181840.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-28
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-28
AI Technical Summary
The isolating switches and grounding switches on existing circuit breakers need to be manually operated during operation and cannot be controlled remotely. Due to the complexity of the interlocking mechanism, misoperation is prone to occur, resulting in safety hazards.
An electric drive mechanism is designed to realize the automatic operation of the isolating switch and the ground switch through the combination of the slide transmission wheel and the large gear. The logic control of the control system is used to achieve interlocking between the isolating switch and the grounding switch, avoid manual misoperation, and set up manual operation protection devices to ensure safety.
It realizes fully automated operation of the isolating switch and grounding switch, improves safety and reliability, simplifies the structure, and provides remote automatic control and manual safe operation functions, supporting intelligent system upgrades.
Smart Images
Figure CN222581027U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to an electric drive mechanism and a full-electric combined circuit breaker. Background Art
[0002] At present, the isolating switch and the grounding switch on the circuit breaker need to have an interlocking function during operation, that is, when the isolating switch is closed, the grounding switch must be opened, and vice versa, when the grounding switch is closed, the isolating switch must be in the open state. In order to avoid operators' misoperation of the isolating switch and the grounding switch, a complex interlocking mechanism needs to be set on the conventional circuit breaker to interlock the isolating switch and the grounding switch to ensure that the isolating switch and the grounding switch cannot be closed at the same time. The isolating switch and the grounding switch on the existing circuit breaker can only be opened or closed by manually turning the drive shaft of the isolating switch or the grounding switch on site, and cannot be remotely controlled, which is not conducive to the intelligent upgrade of the system; at the same time, in order to avoid manual misoperation, a complex interlocking mechanism needs to be set to avoid accidents caused by misoperation. Therefore, there is an urgent need for a fully automatic combined circuit breaker that can automatically operate the isolating switch and the grounding switch, is safe and reliable, and has a simple structure. Summary of the invention
[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide an electric drive mechanism and a fully electric combined circuit breaker, which are electrically driven to open and close the disconnector and the earthing switch, and are fully automatically operated. The interlocking of the disconnector and the earthing switch is achieved by the logic control of the control system, thereby avoiding possible misoperation caused by manual operation. The utility model has high safety, simple and reliable structure, and can be remotely and automatically controlled, providing a basis for the intelligent upgrade of the system.
[0004] The purpose of the utility model is achieved in this way:
[0005] An electric drive mechanism is installed on a bracket and is used to drive an operating shaft to rotate, comprising a slider transmission wheel fixedly mounted on the operating shaft, a large gear rotatably arranged on the operating shaft, a driving device arranged on the bracket and used to drive the large gear to rotate, a large gear limiting mechanism for limiting the rotation of the large gear, and a transmission wheel limiting mechanism for limiting the rotation of the slider transmission wheel; a first slider and a second slider are movably arranged on the slider transmission wheel through an elastic member, the first slider and the second slider are symmetrically arranged, and an inclined surface is arranged on one side of the top and a vertical surface is arranged on the other side; a round pin is arranged on the circumference of the large gear and contacts the vertical side surface of the first slider or the second slider; the driving device drives the large gear to rotate, and the vertical side surface of the first slider or the second slider is pushed by the round pin of the large gear, thereby driving the slider transmission wheel to rotate, and then driving the operating shaft to rotate.
[0006] Furthermore, an inverted T-slot is provided on the slider transmission wheel, the first slider or the second slider is slidably arranged in the corresponding T-slot, and a step is provided at the bottom of the first slider or the second slider to cooperate with the T-slot and limit the sliding of the first slider or the second slider.
[0007] Furthermore, the elastic member is a spring arranged in the T-shaped groove, which provides elastic force for the first slider or the second slider to push the slider transmission wheel outward.
[0008] Furthermore, the transmission wheel limiting mechanism includes a first limiting pin and a second limiting pin which are arranged on the bracket and are used to press the first slider or the second slider into the slider transmission wheel along the inclined surface.
[0009] Furthermore, the driving device includes a motor arranged on the bracket, and an intermediate gear rotatably arranged on the bracket and transmitting the rotation of the motor to the large gear.
[0010] Furthermore, the large gear limiting mechanism includes a boss arranged on the large gear and rotating synchronously with the large gear, and a micro switch arranged on the bracket; the trigger point of the micro switch is arranged on the rotation path of the large gear boss.
[0011] Furthermore, the micro switches include two, which are symmetrically arranged, corresponding to the forward rotation and reverse rotation of the large gear respectively.
[0012] A fully electric combined circuit breaker comprises a circuit breaker, an isolating switch and an earthing switch, and is also equipped with any of the above electric drive mechanisms, and the electric drive mechanism drives the corresponding operating shaft of the isolating switch or the earthing switch to rotate, thereby realizing automatic opening and closing of the isolating switch or the earthing switch.
[0013] Furthermore, the all-electric combined circuit breaker also includes a control system connected to the signal of the all-electric combined circuit breaker; the control system is provided with an interlocking control logic of an isolating switch and a grounding switch, and controls the electric drive mechanism to safely drive the isolating switch and the grounding switch to open and close.
[0014] Furthermore, the all-electric combined circuit breaker is also equipped with a manual operation protection device, including a first baffle and a second baffle hingedly mounted on a support plate of the all-electric combined circuit breaker, respectively used to block the operating ports of the disconnector and the earthing switch, thereby respectively shielding the operating ports of the disconnector and the earthing switch; the first baffle and the second baffle are associated and connected via an interlocking mechanism to achieve associated interlocking between the disconnector and the earthing switch, thereby meeting the requirements of on-site manual safety operation.
[0015] Furthermore, the interlocking mechanism includes an isolating gear and a grounding gear which rotate following the isolating switch operating shaft and the grounding switch operating shaft respectively, a first rack and a second rack which are respectively meshed with the isolating gear and the grounding gear, and a first spring group and a second spring group which respectively control the rotation of the first baffle and the second baffle; the first spring group includes an upper spring A and a lower spring A, wherein the two ends of the lower spring A are respectively hinged to the first rack and the first baffle, and the two ends of the upper spring A are respectively hinged to the first baffle and the circuit breaker switch arm; the second spring group includes an upper spring B and a lower spring B, wherein the two ends of the upper spring B are respectively hinged to the second rack and the second baffle, and the two ends of the lower spring B are respectively hinged to the second baffle and the support plate.
[0016] Furthermore, the support plate is provided with a limit pin, and the first baffle plate and the second baffle plate are both provided with an arc groove, and the limit pin is embedded in the arc groove to limit the rotation of the first baffle plate and the second baffle plate.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] The electric drive mechanism of the utility model realizes clutch transmission between the large gear and the sliding transmission wheel by arranging a round pin and a first slider and a second slider between the large gear and the slider transmission wheel, and utilizes the intermittent transmission of the round pin and the first slider and the second slider, thereby meeting the requirements of clutch intermittent drive of the operating shaft and providing a basis for realizing automatic operation of the combined circuit breaker.
[0019] The fully electric combined circuit breaker of the utility model drives the closing and opening of the isolating switch and the earthing switch respectively through an independent electric drive mechanism, and the automatic operation avoids the risk of manual misoperation. It has high safety, simple and reliable structure, and can be remotely and automatically controlled.
[0020] The fully electric combined circuit breaker of the utility model is provided with a manual operation protection device to prevent manual misoperation. The linkage effect of the rack and the spring is used to control the baffle to block the manual operation port, thereby realizing the associated interlocking between the isolating switch and the earthing switch, preventing the misoperation of closing the isolating switch and the earthing switch at the same time during manual operation, and meeting the requirements of on-site manual safety operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The utility model is a schematic diagram of the assembly structure of an electric drive mechanism.
[0022] Figure 2 The utility model is a clutch transmission working principle diagram of an electric drive mechanism.
[0023] Figure 3 The utility model is a schematic diagram of an electric transmission structure of a fully electric combined circuit breaker.
[0024] Figure 4 The utility model is a schematic diagram of the disconnecting switch of a fully electric combined circuit breaker in the open state.
[0025] Figure 5 The utility model is a schematic diagram of the closing process of the isolating switch of a fully electric combined circuit breaker.
[0026] Figure 6 The utility model is a schematic diagram of the closing process of the isolating switch of a fully electric combined circuit breaker.
[0027] Figure 7 The utility model is a schematic diagram of the disconnector closing state of a fully electric combined circuit breaker.
[0028] Figure 8 The utility model is a schematic diagram of a state where the automatic closing operation of the isolating switch of a fully electric combined circuit breaker is completed.
[0029] Fig. 9 The utility model is a schematic diagram of the structure of a manual operation protection device of a fully electric combined circuit breaker.
[0030] Fig.10 The utility model is a schematic diagram of the gear rack structure of the interlocking mechanism of the all-electric combined circuit breaker.
[0031] Fig.11 The utility model is a perspective structural diagram of the interlocking mechanism connection of a fully electric combined circuit breaker.
[0032] Fig.12 The utility model is a schematic diagram of the disconnecting switch and the earthing switch of a fully electric combined circuit breaker in the open state.
[0033] Fig.13 The utility model is a schematic diagram of the disconnecting switch opening state and the earthing switch closing state of a fully electric combined circuit breaker.
[0034] Fig.14 The utility model is a schematic diagram of the disconnecting switch closing state and the earthing switch opening state of a fully electric combined circuit breaker.
[0035] Fig.15 The utility model is a schematic diagram of the isolating switch closing state, the earthing switch opening state and the isolating switch closing state of a fully electric combined circuit breaker. DETAILED DESCRIPTION Embodiment 1:
[0036] See also Figure 1~Figure 2The utility model relates to an electric drive mechanism, which is installed on a bracket 1 and is used to drive the operating shaft 2 to rotate, and includes a slider transmission wheel 21 fixed on the operating shaft 2, a large gear 22 rotatably arranged on the operating shaft 2, a driving device arranged on the bracket 1 and used to drive the large gear 22 to rotate, a large gear limiting mechanism for limiting the rotation of the large gear 22, and a transmission wheel limiting mechanism for limiting the rotation of the slider transmission wheel 21;
[0037] The slider transmission wheel 21 is movably provided with a first slider 211 and a second slider 212 through an elastic member, the first slider 211 and the second slider 212 are symmetrically arranged, and an inclined surface is arranged on one side of the top and a vertical surface is arranged on the other side; specifically, an inverted T-shaped slot 215 is arranged on the slider transmission wheel 21, and the first slider 211 or the second slider 212 is arranged in the corresponding T-shaped slot 215 for lifting and sliding, and a step 216 is arranged at the bottom of the first slider 211 or the second slider 212 for cooperating with the T-shaped slot 215 and limiting the sliding of the first slider 211 or the second slider 212; the elastic member is a spring arranged in the T-shaped slot 215, which provides the first slider 211 or the second slider 212 with an elastic force to eject the slider transmission wheel 21 outward; when the first slider 211 or the second slider 212 is not subjected to external pressure, the spring in the T-shaped slot 215 ejects the first slider 211 or the second slider 212 outward from the outer cylindrical surface of the slider transmission wheel 21;
[0038] A round pin 221 is provided on the circumference of the large gear 22, which contacts the vertical side surface of the first slider 211 or the second slider 212. As the large gear 22 rotates, the round pin 221 pushes the vertical side surface of the first slider 211 or the second slider 212, so that the first slider 211 or the second slider 212 drives the slider transmission wheel 21 to rotate along with the large gear 22.
[0039] The transmission wheel limiting mechanism includes a first limiting pin 213 and a second limiting pin 214 arranged on the bracket 1 for pressing the first slider 211 or the second slider 212 into the slider transmission wheel 21 along the inclined surface, so as to limit the rotation of the slider transmission wheel 21; specifically, when the large gear 22 rotates clockwise, the round pin 221 pushes the vertical side surface of the first slider 211 to drive the slider transmission wheel 21 to rotate clockwise, and when the inclined surface of the first slider 211 contacts the first limiting pin 213, the first slider 211 is pressed by the first limiting pin 213 and retracted into the slider transmission wheel 21, and the round pin 221 slides over the first slider 211 and continues to rotate clockwise. The first slider 211 is moved, and the slider transmission wheel 21 stops actively rotating clockwise because the round pin 221 loses its pushing effect on the first slider 211; similarly, when the large gear 22 rotates counterclockwise, the round pin 221 pushes the vertical side surface of the second slider 212 to drive the slider transmission wheel 21 to rotate counterclockwise. When the inclined surface of the second slider 212 contacts the second limiting pin 214, the second slider 212 is pressed by the second limiting pin 214 and retracts into the slider transmission wheel 21. The round pin 221 slides over the second slider 212 and continues to rotate counterclockwise. Since the round pin 221 loses its pushing effect on the second slider 212, the slider transmission wheel 21 stops actively rotating counterclockwise.
[0040] The driving device comprises a motor 11 arranged on the bracket 1, and an intermediate gear 12 rotatably arranged on the bracket 1 and transmitting the rotation of the motor 11 to the large gear 22; the motor 11 drives the intermediate gear 12 to rotate through a reduction mechanism, thereby driving the large gear 22 to rotate, and the round pin 221 of the large gear 22 pushes the vertical side of the first slider 211 or the second slider 212 to drive the slider transmission wheel 21 to rotate clockwise or counterclockwise, thereby driving the operating shaft 2 to rotate clockwise or counterclockwise, thereby realizing the automatic switch function;
[0041] The large gear limiting mechanism includes a boss 222 arranged on the large gear 22 and rotating synchronously with the large gear 22, and two micro switches 13 arranged on the bracket 1; the trigger point of the micro switch 13 is arranged on the rotation path of the boss 222 of the large gear 22; the two micro switches 13 are symmetrically arranged, corresponding to the forward and reverse rotation of the large gear 22 respectively. When the boss 222 of the large gear 22 touches the micro switch 13, a stop signal is triggered, the motor 11 of the driving device stops driving, and the large gear 22 stops rotating, thereby achieving the purpose of limiting the rotation of the large gear 22; in other embodiments, for the convenience of maintenance and repair, if the micro switch 13 needs to be replaced, the micro switch 13 can be installed on the outer side of the bracket 1, and the boss 222 of the large gear 22 also extends out to the outer side of the bracket 1 accordingly to ensure the position matching with the micro switch 13;
[0042] Working principle: When the operating shaft 2 needs to rotate counterclockwise, the motor 11 drives the large gear 22 to rotate counterclockwise, and the round pin 221 slides over the first slider 211 which is pressed by the first limit pin 213 and retracted into the slider transmission wheel 21. When the round pin 221 continues to rotate and contacts the vertical side of the second slider 212, the second slider 212 is pushed by the round pin 221 to drive the slider transmission wheel 21 to rotate counterclockwise, thereby driving the operating shaft 2 to rotate counterclockwise; when the inclined surface of the second slider 212 contacts the second limit pin 213 ... When the pin 214 is pushed, the second slider 212 is pressed by the second limit pin 214 and retracts into the slider transmission wheel 21, and the round pin 221 slides over the second slider 212 and continues to rotate counterclockwise. Since the round pin 221 loses the pushing effect on the second slider 212, the slider transmission wheel 21 stops actively rotating counterclockwise, and the operating shaft 2 completes the counterclockwise rotation; the large gear 22 continues to rotate counterclockwise, and when the boss 222 touches the micro switch 13, the motor 11 stops driving, and the large gear 22 stops rotating counterclockwise.
[0043] Similarly, when the operating shaft 2 needs to rotate clockwise, the motor 11 drives the large gear 22 to rotate clockwise, and the round pin 221 slides over the second slider 212 which is pressed by the second limit pin 214 and retracted into the slider transmission wheel 21. When the round pin 221 continues to rotate and contacts the vertical side of the first slider 211, the first slider 211 is pushed by the round pin 221 to drive the slider transmission wheel 21 to rotate clockwise, thereby driving the operating shaft 2 to rotate clockwise; when the inclined surface of the first slider 211 contacts the first limit pin 2 At 13, the first slider 211 is pressed by the first limit pin 213 and retracts into the slider transmission wheel 21, and the round pin 221 slides over the first slider 211 and continues to rotate clockwise. Since the round pin 221 loses its pushing effect on the first slider 211, the slider transmission wheel 21 stops actively rotating clockwise, and the operating shaft 2 completes its clockwise rotation; the large gear 22 continues to rotate clockwise until the boss 222 touches the micro switch 13, the motor 11 stops driving, and the large gear 22 stops rotating clockwise;
[0044] In the electric drive mechanism of the utility model, the large gear 22 and the sliding transmission wheel 21 realize clutch transmission by intermittent contact between the round pin 221 and the first slider 211 and the second slider 212, which not only transmits the power required for the rotation of the operating shaft 2, but also utilizes the pressing effect of the first limit pin 213 and the second limit pin 214 on the first slider 211 and the second slider 212 to disengage the transmission between the large gear 22 and the sliding transmission wheel 21 in time, thereby realizing the clutch transmission between the large gear 22 and the sliding transmission wheel 21, meeting the demand for clutch intermittent drive of the operating shaft 2, and providing a basis for realizing the automatic operation of the combined circuit breaker. Embodiment 2:
[0045] See also Figure 3~Figure 15The utility model relates to a fully electric combined circuit breaker, comprising a circuit breaker, an isolating switch and an earthing switch, and is also equipped with two sets of electric drive mechanisms and manually operated protection devices in the above-mentioned embodiments, and also comprises a control system connected to the signal of the fully electric combined circuit breaker; the control system is provided with an isolating switch and an earthing switch interlocking control logic, and can be remotely connected to the fully electric combined circuit breaker through a signal network, and controls the electric drive mechanism to safely drive the isolating switch and the earthing switch to open and close, thereby realizing remote automatic operation;
[0046] The electric drive mechanism drives the corresponding operating shaft of the isolating switch or the earthing switch to rotate, so as to realize the automatic opening and closing of the isolating switch or the earthing switch. Specifically, the two sets of electric drive mechanisms independently drive the isolating switch operating shaft 23 and the earthing switch operating shaft 24 respectively; Figure 4 The isolating switch is in the open state. At this time, the first slider 211 is pressed by the first limit pin 213 and retracts into the slider transmission wheel 21. When the control system receives the "isolating switch closing" command, the motor 11 drives the large gear 22 to rotate counterclockwise; the round pin 221 of the large gear 22 passes over the first slider 211. When it rotates to Figure 5 When the round pin 221 is in the vertical position, it contacts the vertical side of the second slider 212 and drives the slider transmission wheel 21 and the isolating switch operating shaft 23 to rotate counterclockwise; when it turns to Figure 6 When the isolating switch is in the closed position, the isolating switch reset spring connected to the isolating switch operating shaft 23 on the all-electric combined circuit breaker will directly release energy after the isolating switch operating shaft 23 rotates through the middle position of the isolating switch reset spring, so that the isolating switch is closed quickly. Figure 7 At this time, the second slider 212 is pressed into the slider transmission wheel 21 by the second limit pin 214, and the large gear 22 is still driven by the motor 11 to keep rotating counterclockwise over the second slider 212 until the boss 222 of the large gear 22 touches the micro switch 13, the motor 11 stops outputting, the large gear 22 stops rotating, and the disconnector is automatically closed. Figure 8 After the isolating switch is closed, when the isolating switch needs to be opened, the opening command is input to the control system, and the motor 11 drives the large gear 22 to rotate clockwise, and the automatic opening is completed by executing the above-mentioned principle actions;
[0047] Similarly, the automatic closing and opening operation of the grounding switch is consistent with the operating principle of the above-mentioned isolating switch, and will not be repeated here, but the grounding switch and the isolating switch are protected by the control logic of the control system and cannot be closed at the same time;
[0048] In addition, in the actual application of the all-electric combined circuit breaker, manual operation is often required on the equipment site, such as installation and commissioning, temporary maintenance, etc. Therefore, a manual operation protection device is installed on the all-electric combined circuit breaker, including a first baffle 31 and a second baffle 32 hingedly installed on the support plate 30 of the all-electric combined circuit breaker and used to block the operating ports of the disconnector and the earthing switch respectively, and the operating ports of the disconnector and the earthing switch are respectively blocked. Fig. 9 The first baffle 31 and the second baffle 32 are connected by an interlocking mechanism to realize the interlocking between the isolating switch and the earthing switch, thereby preventing the erroneous operation of closing the isolating switch and the earthing switch at the same time during manual operation, and meeting the requirements of manual safety operation on site;
[0049] See also Figure 9~Figure 11 The interlocking mechanism comprises an isolating gear 33 and a grounding gear 34 which are respectively arranged on the isolating switch operating shaft 23 and the grounding switch operating shaft 24 and rotate with the isolating switch operating shaft 23 and the grounding switch operating shaft 24, a second rack 36 and a first rack 35 which are respectively meshed with the isolating gear 33 and the grounding gear 34, and a first spring group 37 and a second spring group 38 which respectively control the rotation of the first baffle 31 and the second baffle 32; the first spring group 37 comprises an upper spring A and a lower spring A, wherein the two ends of the lower spring A are respectively connected to the first rack 35 and the first baffle. The plate 31 is hinged, and the two ends of the upper spring A are respectively hinged to the first baffle plate 31 and the circuit breaker switch arm; the second spring group 38 includes an upper spring B and a lower spring B, wherein the two ends of the upper spring B are respectively hinged to the second rack 36 and the second baffle plate 32, and the two ends of the lower spring B are respectively hinged to the second baffle plate 32 and the support plate 30; a limit pin 310 is provided on the support plate 30, and an arc groove 39 is provided on the first baffle plate 31 and the second baffle plate 32, and the limit pin 310 is embedded in the arc groove 39 to limit the rotation of the first baffle plate 31 and the second baffle plate 32.
[0050] Interlocking protection principle of interlocking mechanism: Fig.12 The circuit breaker is open, the isolating switch is open, and the grounding switch is open. At this time, the first baffle 31 and the second baffle 32 are both in the open state, and the isolating switch or the grounding switch can be closed respectively;
[0051] When the grounding switch is closed, the grounding switch operating shaft 24 is rotated counterclockwise, and the grounding gear 34 is synchronously rotated counterclockwise to drive the first rack 35 to move upward, thereby reducing the tension of the lower half of the first spring group 37. Under the tension of the upper half of the first spring group 37, the first baffle 31 is driven to rotate clockwise, so that the first baffle 31 blocks the operating port of the isolating switch, making it impossible to operate the isolating switch when the grounding switch is closed. Fig.13 ;
[0052] When the isolating switch is closed, the isolating switch operating shaft 23 is rotated counterclockwise, and the isolating gear 33 is synchronously rotated counterclockwise to drive the second rack 36 to move downward, thereby reducing the tension of the upper half of the second spring group 38. Under the tension of the lower half of the second spring group 38, the second baffle 32 is driven to rotate clockwise, so that the second baffle 32 blocks the operating port of the grounding switch, making it impossible to operate the grounding switch when the isolating switch is closed. Fig.14 ;
[0053] When the isolating switch is closed, the operating port of the grounding switch is blocked by the second baffle 32, and the operating port of the isolating switch is opened. Fig.14 Then the circuit breaker is closed. At this time, the upper half of the first spring group 37 is pulled by the closing of the circuit breaker, which drives the first baffle 31 to rotate clockwise and thus blocks the operating port of the disconnector. Fig.15 That is, when the circuit breaker is in the closed state, the operating ports of the isolating switch and the grounding switch are blocked and operation is prohibited.
[0054] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.
Claims
1. An electric drive mechanism, mounted on a bracket (1) and used to drive an operating shaft (2) to rotate, characterized in that: The invention comprises a slider transmission wheel (21) fixedly mounted on an operating shaft (2), a large gear (22) rotatably mounted on the operating shaft (2), a driving device mounted on a bracket (1) for driving the large gear (22) to rotate, a large gear limiting mechanism for limiting the rotation of the large gear (22), and a transmission wheel limiting mechanism for limiting the rotation of the slider transmission wheel (21); a first slider (211) and a second slider (212) are movably mounted on the slider transmission wheel (21) via an elastic member, wherein the first slider (211) and the second slider (212) are movable. The two sliders (212) are symmetrically arranged, and both have an inclined surface on one side of the top and a vertical surface on the other side; a round pin (221) is provided on the circumference of the large gear (22) for contacting the vertical side surface of the first slider (211) or the second slider (212); the driving device drives the large gear (22) to rotate, and the round pin (221) of the large gear (22) pushes the vertical side surface of the first slider (211) or the second slider (212), thereby driving the slider transmission wheel (21) to rotate, and further driving the operating shaft (2) to rotate.
2. The electric drive mechanism according to claim 1, characterized in that: An inverted T-shaped slot (215) is provided on the slider transmission wheel (21); the first slider (211) or the second slider (212) is slidably disposed in the corresponding T-shaped slot (215); and a step (216) is provided at the bottom of the first slider (211) or the second slider (212) for cooperating with the T-shaped slot (215) and limiting the sliding of the first slider (211) or the second slider (212).
3. The electric drive mechanism according to claim 2, characterized in that: The elastic member is a spring arranged in the T-shaped groove (215) and provides elastic force for the first slider (211) or the second slider (212) to push the slider transmission wheel (21) outward.
4. The electric drive mechanism according to claim 1, characterized in that: The transmission wheel limiting mechanism comprises a first limiting pin (213) and a second limiting pin (214) arranged on the bracket (1) and used for pressing the first slider (211) or the second slider (212) along the inclined surface into the slider transmission wheel (21).
5. The electric drive mechanism according to claim 1, characterized in that: The driving device comprises a motor (11) arranged on a bracket (1), and an intermediate gear (12) rotatably arranged on the bracket (1) and transmitting the rotation of the motor (11) to a large gear (22).
6. The electric drive mechanism according to claim 1, characterized in that: The large gear limiting mechanism comprises a boss (222) arranged on the large gear (22) and rotating synchronously with the large gear (22), and a micro switch (13) arranged on the bracket (1); the trigger point of the micro switch (13) is arranged on the rotation path of the boss (222) of the large gear (22).
7. The electric drive mechanism according to claim 6, characterized in that: The micro switches (13) include two micro switches, which are symmetrically arranged and correspond to the forward and reverse rotation conditions of the large gear (22) respectively.
8. A fully electric combined circuit breaker, comprising a circuit breaker, a disconnector and a grounding switch, characterized in that: An electric drive mechanism according to any one of claims 1 to 6 is also installed, and the electric drive mechanism drives the corresponding operating shaft of the disconnector or earthing switch to rotate, thereby realizing automatic opening and closing of the disconnector or earthing switch.
9. The all-electric combined circuit breaker according to claim 8, characterized in that: It also comprises a control system connected with the signal of the all-electric combined circuit breaker; the control system is provided with an interlocking control logic of an isolating switch and a grounding switch, and controls the electric drive mechanism to safely drive the isolating switch and the grounding switch to open and close.
10. The all-electric combined circuit breaker according to claim 8, characterized in that: A manual operation protection device is also installed, comprising a first baffle (31) and a second baffle (32) hingedly installed on a support plate (30) of the all-electric combined circuit breaker, and used to block the operating openings of the disconnector and the earthing switch respectively, so as to block the operating openings of the disconnector and the earthing switch respectively; The first baffle (31) and the second baffle (32) are connected via an interlocking mechanism, thereby realizing interlocking between the isolating switch and the earthing switch, thereby meeting the requirements of on-site manual safety operation.
11. The all-electric combined circuit breaker according to claim 10, characterized in that: The interlocking mechanism comprises an isolating gear (33) and a grounding gear (34) which rotate respectively following the isolating switch operating shaft and the grounding switch operating shaft, a first rack (35) and a second rack (36) which are respectively meshed with the isolating gear (33) and the grounding gear (34), and a first spring group (37) and a second spring group (38) which respectively control the rotation of the first baffle plate (31) and the second baffle plate (32); the first spring group (37) comprises an upper spring A and a lower spring A, wherein the two ends of the lower spring A are respectively hinged to the first rack (35) and the first baffle plate (31), and the two ends of the upper spring A are respectively hinged to the first baffle plate (31) and the circuit breaker switch arm; the second spring group (38) comprises an upper spring B and a lower spring B, wherein the two ends of the upper spring B are respectively hinged to the second rack (36) and the second baffle plate (32), and the two ends of the lower spring B are respectively hinged to the second baffle plate (32) and the support plate (30).
12. The all-electric combined circuit breaker according to claim 10, characterized in that: A limiting pin (310) is provided on the support plate (30), and an arc-shaped groove (39) is provided on the first baffle plate (31) and the second baffle plate (32). The limiting pin (310) is embedded in the arc-shaped groove (39) to limit the rotation of the first baffle plate (31) and the second baffle plate (32).