Three-position switching mechanism

Abstract

A three-position switching mechanism comprises a gear driving box, the gear driving box comprises a front plate, the front plate is provided with an isolation input shaft and a grounding input shaft which are used for being driven by a handle, and the isolation input shaft and the grounding input shaft are respectively linked with an isolation identification disc and a grounding identification disc. The isolation identification disc is provided with a first limiting tooth and a second limiting tooth which are used for being clamped with the handle at an isolation closing position and an isolation opening position, and the first limiting tooth and the second limiting tooth form one-way rotation limiting on the handle, so that the handle can only drive the isolation input shaft to switch the isolation opening and closing state; the second limiting tooth is located in front of the grounding input shaft in an isolation switching-on state to block insertion of the handle; and the grounding identification disc is provided with a third limiting tooth and a fourth limiting tooth which are used for being clamped with the handle at a grounding closing position and a grounding opening position, so that the handle can only drive the grounding input shaft to switch the grounding opening and closing state.

Description

Technical Field

[0001] The invention relates to a three-position switch mechanism, belonging to the field of three-position mechanisms. Background Art

[0002] A three-position switch (3PS) is a device that integrates the functions of an isolating switch and an earthing switch. Commonly used in fully enclosed combination or composite electrical appliances, it combines the functions of both an isolating switch and an earthing switch. Its operating position is unique at any given moment, providing a mechanical lock to prevent the main circuit from becoming energized. The three-position mechanism controls the high-voltage switch's three positions: closing, opening, and earthing.

[0003] Existing three-position switch mechanisms often lack adequate protection against misoperation and interlocking after the handle is inserted, resulting in poor interlocking functionality. Most designs rely solely on a single spring or simple cam limiter. Even after the operating handle is fully inserted, it can still become overshot or stuck due to external forces or inertia, causing inaccurate operation and increasing the risk of malfunction. The commonly used connecting rod pin lock components require high machining precision, and assembly errors or long-term vibration accumulation can lead to interlock failure, making it impossible to completely prevent closing or opening the switch in an unauthorized position. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a three-position switch mechanism.

[0005] A three-position switch mechanism includes a gear drive box, which includes a front plate, on which are provided an isolation input shaft and a grounding input shaft for being driven by a handle, the isolation input shaft and the grounding input shaft are respectively linked with an isolation identification disk and a grounding identification disk, the isolation identification disk is provided with a first limiting tooth and a second limiting tooth for engaging with the handle in the isolation closing position and the isolation opening position, the first limiting tooth and the second limiting tooth form a one-way rotation limit for the handle, so that the handle can only drive the isolation input shaft to switch the isolation closing and opening states, the second limiting tooth is located in front of the grounding input shaft in the isolation closing state to block the insertion of the handle; the grounding identification disk is provided with a third limiting tooth and a fourth limiting tooth for engaging with the handle in the grounding closing position and the grounding opening position, so that the handle can only drive the grounding input shaft to switch the grounding closing and opening states.

[0006] Preferably, the handle is provided with a first clamping ring and a second clamping ring, and the first clamping ring and the second clamping ring are both provided with a plurality of ratchets. The first clamping ring and the second clamping ring are staggered and arranged on the handle. The end of the handle is provided with a clamping groove for inserting the drive isolation input shaft and the grounding input shaft, and the clamping groove is used to clamp with the pin shaft on the isolation input shaft and the grounding input shaft.

[0007] Furthermore, the first limiting tooth and the second limiting tooth are arranged in opposite layers, the third limiting tooth and the fourth limiting tooth are arranged in opposite layers, and the ratchet directions of the first clamping ring and the second clamping ring are arranged in opposite directions to respectively cooperate with the first limiting tooth and the third limiting tooth, the second limiting tooth and the fourth limiting tooth to form a one-way rotation limit for the handle.

[0008] Preferably, the isolation identification disk and the grounding identification disk are respectively arranged on both sides of the isolation input shaft and the grounding input shaft, and the isolation identification disk and the grounding identification disk are both provided with a limit disk for preventing the handle from being pulled out when the handle drives the opening and closing of the switch. The limit disk is provided with a first groove, a second groove and a third groove. The two first grooves and the second grooves are arranged relative to each other in the isolation opening position and the grounding opening position, and are used to form a first rotation space and a second rotation space for the handle to be inserted into the isolation input shaft or the grounding input shaft. When the third groove is in the isolation closing position or the grounding closing position, it forms a third rotation space for the handle to be inserted for opening the switch or the handle to be pulled out after being closed in place with the second groove on the grounding identification disk or the first groove on the isolation identification disk. The limit disk on the grounding identification disk is used to be located in front of the isolation input shaft in the grounding closing state to block the handle from being inserted.

[0009] Preferably, a locking component is also provided on the front plate, and the locking component includes a first positioning block and a second positioning block respectively sleeved on the isolation input shaft and the grounding input shaft, and the bottom of the first positioning block and the second positioning block is provided with a spring sleeved on the isolation input shaft and the grounding input shaft and abutting against the front plate, and the front plate is provided with a pressure block for limiting the axial stroke of the first positioning block and the second positioning block and a stop block for limiting the circumferential stroke of the first positioning block and the second positioning block, and the first positioning block and the second positioning block are provided with a positioning groove for engaging with the pin shaft on the isolation input shaft and the grounding input shaft to prevent them from rotating when the handle is not inserted, and when the handle needs to be opened and closed, the isolation input shaft or the grounding input shaft is inserted into the isolation input shaft or the grounding input shaft and abuts against the first positioning block or the second positioning block, thereby causing the pin shaft on the isolation input shaft or the grounding input shaft to be disengaged from the locking state with the positioning groove, and the handle can drive the inserted isolation input shaft or the grounding input shaft to rotate.

[0010] Furthermore, the locking component also includes an electromagnet provided in the gear drive box, and the pressure block is connected to the electromagnet through a connecting rod. The pressure block is made of magnetic material. When it is necessary to isolate the input shaft or the grounding input shaft by electric drive, the electromagnet is energized and the pressure block is driven to move through the magnetic connection, so that the first positioning block and the second positioning block are released from the pin shaft on the isolation input shaft or the grounding input shaft, and the isolation input shaft and the grounding input shaft can be rotated by electric drive.

[0011] Furthermore, the pressing block is provided with a first pressing arm, a second pressing arm and a third pressing arm located above the first positioning block and the second positioning block and abutting against them, the second pressing arm is located between the first positioning block and the second positioning block, and a first insertion groove and a second insertion groove for inserting the handle into the isolation input shaft or the grounding input shaft respectively are formed between the first pressing arm, the second pressing arm, the second pressing arm and the third pressing arm.

[0012] Furthermore, a protrusion is provided on the stop block, and the side surfaces of the first positioning block and the second positioning block abut against the protrusion, forming a circumferential limit for the first positioning block and the second positioning block, which is used to isolate the input shaft or the grounding input shaft and lock it through the first positioning block and the second positioning block after the switch is opened and closed and no longer rotates.

[0013] Preferably, the isolated input shaft and the grounded input shaft are connected to the isolated output shaft and the grounded output shaft through a gear set arranged in a gear drive box. The isolated output shaft and the grounded output shaft are also linked to the isolated input motor and the grounded input motor. The isolated input motor and the grounded input motor are used to open and close the isolated output shaft and the grounded output shaft by electrically driving the isolated output shaft and the grounded output shaft.

[0014] Furthermore, the isolated input motor and the grounded input motor are both connected to a clutch, which is used to release the linkage state between the drive shaft of the isolated input motor or the grounded input motor and the isolated output shaft or the grounded output shaft after the isolated input motor or the grounded input motor is driven to open and close.

[0015] The beneficial effects of the present invention are as follows: By providing a first limiting tooth and a second limiting tooth on the isolation identification disk, the handle can only switch in one direction between the "isolation closed" and "isolation open" positions, preventing the handle from accidentally entering an unintended position due to external force or inertia, thereby improving operational accuracy and reliability. When the isolation input shaft is in the closed state, the second limiting tooth is placed in front of the grounding input shaft path, thereby physically blocking the handle from entering the grounding position, ensuring that the insulation isolation and grounding positions are never closed at the same time, effectively preventing the danger of live grounding or simultaneous live operation. The third and fourth limiting teeth on the grounding identification disk also achieve one-way limiting of the handle in the "grounding closed" and "grounding open" positions, making the grounding operation and isolation operation completely independent in structure and reducing the risk of interlock failure caused by the failure of a single spring or cam component. Because the limiting teeth are directly provided on the identification disk, there is no need to rely on the precision-sensitive connecting rod pin lock. The structure is stable and wear-resistant, and can operate stably in high-vibration environments for a long time, significantly reducing the probability of misoperation due to vibration loosening or fatigue failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention in the isolated and closed state;

[0019] Figure 3 It is a schematic diagram of the structure of the present invention in the grounding closing state;

[0020] Figure 4 It is a structural schematic diagram of the handle in the present invention;

[0021] Figure 5 It is a side partial cross-sectional view of the present invention;

[0022] Figure 6 It is a side structural diagram of the present invention;

[0023] Figure 7 It is a rear structural diagram of the present invention;

[0024] Figure 8 It is a structural diagram of the briquette;

[0025] In the figure, 1. gear drive box; 2. front plate; 21. stopper; 211. protrusion; 22. pressure block; 221. first pressing arm; 222. second pressing arm; 223. third pressing arm; 224. first insertion slot; 225. second insertion slot; 23. electromagnet; 231. connecting rod; 3. isolation input shaft; 31. first positioning block; 32. spring; 33. positioning slot; 4. grounding input shaft; 41. pin; 42. second positioning block; 5. isolation identification disk; 51. first limiting tooth; 52 , second limiting tooth; 6, grounding identification plate; 61, third limiting tooth; 62, fourth limiting tooth; 63, limiting plate; 64, first groove; 65, second groove; 66, third groove; 67, first rotation space; 68, second rotation space; 69, third rotation space; 7, handle; 71, first clamping ring; 72, second clamping ring; 73, ratchet; 74, clamping groove; 8, isolation output shaft; 81, isolation input motor; 9, grounding output shaft; 91, grounding input motor; 92, clutch;. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0028] The terms "upper," "lower," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side" used herein are merely references to the directions or positions in the accompanying drawings. These terms are intended to illustrate and facilitate understanding of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] like Figure 1-8 The figure shows an embodiment of a three-position switch mechanism of the present invention, a three-position switch mechanism, including a gear drive box, the gear drive box including a front plate, the front plate is provided with an isolation input shaft and a grounding input shaft for being driven by a handle, the isolation input shaft and the grounding input shaft are respectively linked with an isolation identification disk and a grounding identification disk, the isolation identification disk is provided with a first limiting tooth and a second limiting tooth for engaging with the handle in the isolation closing position and the isolation opening position, the first limiting tooth and the second limiting tooth form a one-way rotation limit for the handle, so that the handle can only drive the isolation input shaft to switch the isolation closing and opening states, the second limiting tooth is located in front of the grounding input shaft in the isolation closing state to block the insertion of the handle; the grounding identification disk is provided with a third limiting tooth and a fourth limiting tooth for engaging with the handle in the grounding closing position and the grounding opening position, so that the handle can only drive the grounding input shaft to switch the grounding closing and opening states.

[0030] By providing the first and second stop teeth on the isolation identification disc, the handle can be switched unidirectionally between the "Isolation Closed" and "Isolation Opened" positions. This prevents the handle from being misplaced due to external forces or inertia, improving operational accuracy and reliability. When the isolation input shaft is closed, the second stop tooth is positioned in front of the grounding input shaft, physically blocking the handle from entering the grounding position. This ensures that the isolation and grounding positions are never closed simultaneously, effectively preventing the danger of live grounding or simultaneous live operation. The third and fourth stop teeth on the grounding identification disc also provide unidirectional stop for the handle in the "Grounded Closed" and "Grounded Opened" positions, making grounding and isolation operations completely independent and reducing the risk of interlock failure due to failure of a single spring or cam. Because the stop teeth are located directly on the identification disc, they eliminate the need for precision-sensitive connecting rod pin locks. The resulting structure is robust and wear-resistant, ensuring long-term stable operation in high-vibration environments and significantly reducing the risk of misoperation due to vibration loosening or fatigue failure.

[0031] The handle is provided with a first clamping ring and a second clamping ring, and each of the first clamping ring and the second clamping ring is provided with a plurality of ratchets. The first clamping ring and the second clamping ring are staggered and arranged on the handle. The end of the handle is provided with a clamping groove for inserting the drive isolation input shaft and the grounding input shaft, and the clamping groove is used to clamp with the pin shaft on the isolation input shaft and the grounding input shaft.

[0032] The first clamping ring and the second clamping ring are arranged in staggered layers and each is provided with a ratchet, forming a two-stage ratchet locking structure. Only when the handle meets the engagement conditions of two sets of ratchets at the same time can the work station switching be completed, effectively preventing misoperation caused by failure of single-stage locking.

[0033] The first and second limiting teeth are staggered in opposite directions, and the third and fourth limiting teeth are staggered in opposite directions. The ratchet teeth of the first and second clamping rings are arranged in opposite directions, respectively cooperating with the first and third limiting teeth, and the second and fourth limiting teeth, to limit the unidirectional rotation of the handle. The two clamping rings achieve locking and linkage without the need for additional complex interlocking parts or connecting pins, reducing the number of parts and assembly steps, simplifying maintenance and repair processes, and lowering subsequent operation and maintenance costs.

[0034] The isolation identification disk and the grounding identification disk are respectively arranged on both sides of the isolation input shaft and the grounding input shaft. The isolation identification disk and the grounding identification disk are both provided with a limit disk for preventing the handle from being pulled out when the handle drives the opening and closing of the switch. The limit disk is provided with a first groove, a second groove and a third groove. The two first grooves and the second grooves are arranged relative to each other in the isolation opening position and the grounding opening position, and are used to form a first rotation space and a second rotation space for the handle to be inserted into the isolation input shaft or the grounding input shaft. When the third groove is in the isolation closing position or the grounding closing position, it forms a third rotation space for the handle to be inserted for opening the switch or the handle to be pulled out after being closed in place with the second groove on the grounding identification disk or the first groove on the isolation identification disk. The limit disk on the grounding identification disk is used to be located in front of the isolation input shaft in the grounding closing state to block the handle from being inserted.

[0035] The reverse-staggered positioning of the limit teeth ensures that the handle can only rotate in the predetermined direction when switching between the isolation and grounding positions, completely preventing overshooting or misplacement due to reverse force. The ratchet teeth of the first and second clamping rings mesh in opposite directions with the corresponding limit teeth, creating a precise one-way rotation limit system, ensuring that the handle can only complete position transitions according to the three-step logic of "exit - insert - rotate".

[0036] In an embodiment of the present application, different from the above-mentioned embodiment, a locking component is also provided on the front plate, and the locking component includes a first positioning block and a second positioning block respectively sleeved on the isolation input shaft and the grounding input shaft, and the bottom of the first positioning block and the second positioning block is provided with a spring sleeved on the isolation input shaft and the grounding input shaft and abutting against the front plate, and the front plate is provided with a pressure block for limiting the axial stroke of the first positioning block and the second positioning block and a stop block for limiting the circumferential stroke of the first positioning block and the second positioning block, and the first positioning block and the second positioning block are provided with a positioning groove for engaging with the pin shaft on the isolation input shaft and the grounding input shaft to prevent them from rotating when the handle is not inserted, and when the handle needs to be opened and closed, the isolation input shaft or the grounding input shaft is inserted into the isolation input shaft or the grounding input shaft and abuts against the first positioning block or the second positioning block, thereby causing the pin shaft on the isolation input shaft or the grounding input shaft to be disengaged from the locking state with the positioning groove, and the handle can drive the inserted isolation input shaft or the grounding input shaft to rotate.

[0037] When the handle is not inserted, the positioning grooves of the first and second positioning blocks engage with the pin shaft, reliably locking the isolation input shaft and the grounding input shaft, and preventing the shaft from idling or malfunctioning due to vibration or external force. The spring under the positioning block continuously applies preload force to it, which can not only quickly reset and relock it after the handle is withdrawn, but also provide controllable damping during the insertion process, improving the feel of the mechanism and self-locking stability. The pressure block on the front plate limits the axial stroke of the positioning block, and the stop block limits its circumferential stroke, ensuring that the positioning block moves only within the range allowed by the design, avoiding jamming or damage to the mechanism due to excessive pushing or rotation. The cooperation between the positioning block and the pin shaft ensures that the input shaft can only be driven after the handle is correctly inserted and abuts the positioning block, ensuring the accuracy and consistency of the opening and closing operations.

[0038] In an embodiment of the present application, different from the above-mentioned embodiment, the locking component also includes an electromagnet arranged in the gear drive box, and the pressure block is connected to the electromagnet through a connecting rod. The pressure block is made of magnetic material. When it is necessary to isolate the input shaft or the grounding input shaft by electric drive, the electromagnet is energized and the pressure block is driven to move through the magnetic connection, so that the first positioning block and the second positioning block are released from the pin shaft on the isolation input shaft or the grounding input shaft, and the isolation input shaft and the grounding input shaft can be rotated by electric drive.

[0039] The introduction of an electromagnet within the gear drive box drives the clamping block through electromagnetic attraction. This allows for seamless switching between handle insertion and electric drive based on the mechanical positioning block, combining both manual and electric interlocking modes to enhance the system's flexibility and safety. The mechanical lock can be released by energizing the electromagnet, eliminating the need for on-site personnel to manually operate the handle. This supports remote or centralized electronic control of the isolation and grounding switches, reducing on-site operation and maintenance efforts and enabling intelligent distribution network control. The electromagnetically driven clamping block operates quickly, quickly unlocking the positioning block upon receiving a closing or opening command. Combined with the electric drive device, this significantly shortens switching time and improves system response speed and switching efficiency.

[0040] The pressing block is provided with a first pressing arm, a second pressing arm and a third pressing arm located above the first positioning block and the second positioning block and abutting against the first positioning block, the second pressing arm is located between the first positioning block and the second positioning block, and a first insertion groove and a second insertion groove for inserting the handle into the isolation input shaft or the grounding input shaft respectively are formed between the first pressing arm, the second pressing arm, the second pressing arm and the third pressing arm.

[0041] The first and second insertion slots, formed by the first, second, and third push arms, accurately guide the handle end along a predetermined trajectory into the isolation input shaft or grounding input shaft, preventing misplacement or jamming due to angular deviation. When the handle end reaches the bottom of the corresponding insertion slot, it simultaneously triggers the release of the first or second positioning block, eliminating the need for additional manual operation.

[0042] The stop block is provided with a protrusion, and the side surfaces of the first positioning block and the second positioning block abut against the protrusion, forming a circumferential limit for the first positioning block and the second positioning block, which is used to isolate the input shaft or the grounding input shaft and lock it through the first positioning block and the second positioning block after the opening and closing are in place and no longer rotate.

[0043] The protrusion on the stopper tightly abuts the sides of the first and second positioning blocks, providing a clear circumferential support surface for the positioning blocks. Once the isolation or grounding position is switched into place, the positioning block is instantly locked by the protrusion to prevent secondary micro-movement in the axial or circumferential direction. The circumferential limit function of the protrusion effectively blocks any unnecessary rotation of the input shaft after opening and closing, eliminating excessive rotation caused by inertia or external forces, and ensuring accurate and reliable switching positions. The limit protrusion locks the positioning block in real time, immediately solidifying the position status in the event of any unexpected impact, avoiding the risk of electric shock or equipment damage caused by misoperation, and significantly improving the overall safety of the distribution system.

[0044] The isolated input shaft and the grounded input shaft are connected to the isolated output shaft and the grounded output shaft through a gear set arranged in the gear drive box. The isolated output shaft and the grounded output shaft are also linked to the isolated input motor and the grounded input motor. The isolated input motor and the grounded input motor are used to open and close the isolated output shaft and the grounded output shaft by electrically driving the isolated output shaft and the grounded output shaft.

[0045] The isolated input shaft and the grounded input shaft are connected to the isolated output shaft and the grounded output shaft through an internal gear set, and then linked to the corresponding motors, realizing seamless switching between manual operation and electric drive. It can be operated by handle in emergency or power-off state, and can be remotely or centrally controlled by the motor during normal operation, greatly improving the flexibility and availability of the system.

[0046] In an embodiment of the present application, unlike the above-mentioned embodiment, the isolated input motor and the grounded input motor are both connected to a clutch, and the clutch is used to decouple the drive shaft of the isolated input motor or the grounded input motor from the isolated output shaft or the grounded output shaft after the isolated input motor or the grounded input motor is driven to open and close.

[0047] The clutch automatically disengages upon successful closing / opening, severing the mechanical linkage between the motor and the output shaft. This effectively prevents the drive shaft from further driving the output shaft due to inertia or external forces, protecting the mechanism from shock or excessive rotation. As an automatic disengagement device, the clutch disengages the moment the switch mechanism is fully activated without the need for additional sensing or control logic, ensuring that the switch mechanism and motor are always in the correct operating state, improving system reliability and stability.

[0048] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

[0049] Although the present invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the specific embodiments disclosed, and the invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A three-position switch mechanism, characterized in that: The gear drive box includes a front plate, on which an isolation input shaft and a grounding input shaft for being driven by a handle are provided. The isolation input shaft and the grounding input shaft are respectively linked to an isolation identification disk and a grounding identification disk. The isolation identification disk is provided with a first limiting tooth and a second limiting tooth for engaging with the handle in the isolation closing position and the isolation opening position. The first limiting tooth and the second limiting tooth form a one-way rotation limit for the handle, so that the handle can only drive the isolation input shaft to switch the isolation opening and closing states. The second limiting tooth is located in front of the grounding input shaft in the isolation closing state to block the insertion of the handle. The grounding identification disk is provided with a third limiting tooth and a fourth limiting tooth for engaging with the handle in the grounding closing position and the grounding opening position, so that the handle can only drive the grounding input shaft to switch the grounding opening and closing states.

2. The three-position switch mechanism according to claim 1, characterized in that: The handle is provided with a first clamping ring and a second clamping ring, and each of the first clamping ring and the second clamping ring is provided with a plurality of ratchets. The first clamping ring and the second clamping ring are staggered and arranged on the handle. The end of the handle is provided with a clamping groove for inserting the drive isolation input shaft and the grounding input shaft, and the clamping groove is used to clamp with the pin shaft on the isolation input shaft and the grounding input shaft.

3. The three-position switch mechanism according to claim 2, characterized in that: The first limiting tooth and the second limiting tooth are arranged in opposite layers, the third limiting tooth and the fourth limiting tooth are arranged in opposite layers, and the ratchet directions of the first clamping ring and the second clamping ring are arranged in opposite directions to respectively cooperate with the first limiting tooth and the third limiting tooth, the second limiting tooth and the fourth limiting tooth to form a one-way rotation limit for the handle.

4. The three-position switch mechanism according to claim 1, wherein: The isolation identification disk and the grounding identification disk are respectively arranged on both sides of the isolation input shaft and the grounding input shaft. The isolation identification disk and the grounding identification disk are both provided with a limit disk for preventing the handle from being pulled out when the handle drives the opening and closing of the switch. The limit disk is provided with a first groove, a second groove and a third groove. The two first grooves and the second grooves are arranged relative to each other in the isolation opening position and the grounding opening position, and are used to form a first rotation space and a second rotation space for the handle to be inserted into the isolation input shaft or the grounding input shaft. When the third groove is in the isolation closing position or the grounding closing position, it forms a third rotation space for the handle to be inserted for opening the switch or the handle to be pulled out after being closed in place with the second groove on the grounding identification disk or the first groove on the isolation identification disk. The limit disk on the grounding identification disk is used to be located in front of the isolation input shaft in the grounding closing state to block the handle from being inserted.

5. The three-position switch mechanism according to claim 1, characterized in that: The front plate is also provided with a locking component, which includes a first positioning block and a second positioning block respectively sleeved on the isolation input shaft and the grounding input shaft, and the bottom of the first positioning block and the second positioning block is provided with a spring sleeved on the isolation input shaft and the grounding input shaft and abutting against the front plate, and the front plate is provided with a pressure block for limiting the axial stroke of the first positioning block and the second positioning block and a stop block for limiting the circumferential stroke of the first positioning block and the second positioning block, and the first positioning block and the second positioning block are provided with a positioning groove for engaging with the pin shaft on the isolation input shaft and the grounding input shaft to prevent them from rotating when the handle is not inserted, and when the handle needs to be opened and closed, the isolation input shaft or the grounding input shaft is inserted into the isolation input shaft or the grounding input shaft and abuts against the first positioning block or the second positioning block, thereby causing the pin shaft on the isolation input shaft or the grounding input shaft to disengage from the locking state with the positioning groove, and the handle can drive the inserted isolation input shaft or the grounding input shaft to rotate.

6. The three-position switch mechanism according to claim 5, characterized in that: The locking component also includes an electromagnet arranged in the gear drive box. The pressure block is connected to the electromagnet through a connecting rod. The pressure block is made of magnetic material. When it is necessary to electrically drive the isolated input shaft or the grounding input shaft, the electromagnet is energized and the pressure block is driven to move through the magnetic connection, so that the first positioning block and the second positioning block are released from the pin shaft on the isolated input shaft or the grounding input shaft, and the isolated input shaft and the grounding input shaft can be rotated by electric drive.

7. The three-position switch mechanism according to claim 5 or 6, characterized in that: The pressing block is provided with a first pressing arm, a second pressing arm and a third pressing arm located above the first positioning block and the second positioning block and abutting against the first positioning block, the second pressing arm is located between the first positioning block and the second positioning block, and a first insertion groove and a second insertion groove for inserting the handle into the isolation input shaft or the grounding input shaft respectively are formed between the first pressing arm, the second pressing arm, the second pressing arm and the third pressing arm.

8. The three-position switch mechanism according to claim 5, characterized in that: The stop block is provided with a protrusion, and the side surfaces of the first positioning block and the second positioning block abut against the protrusion, forming a circumferential limit for the first positioning block and the second positioning block, which is used to isolate the input shaft or the grounding input shaft and lock it through the first positioning block and the second positioning block after the opening and closing are in place and no longer rotate.

9. The three-position switch mechanism according to claim 1, characterized in that: The isolated input shaft and the grounded input shaft are connected to the isolated output shaft and the grounded output shaft through a gear set arranged in the gear drive box. The isolated output shaft and the grounded output shaft are also linked to the isolated input motor and the grounded input motor. The isolated input motor and the grounded input motor are used to open and close the isolated output shaft and the grounded output shaft by electrically driving the isolated output shaft and the grounded output shaft.

10. The three-position switch mechanism according to claim 9, characterized in that: The isolated input motor and the grounded input motor are both connected to a clutch, which is used to release the linkage state between the drive shaft of the isolated input motor or the grounded input motor and the isolated output shaft or the grounded output shaft after the isolated input motor or the grounded input motor is driven to open and close.

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