Three-station mechanism position signal operating mechanism and isolation grounding switch

Abstract

The invention discloses a three-station mechanism position signal operating mechanism and an isolation grounding switch, the mechanism comprises a top plate and a bottom plate, the top plate is provided with a second position signal device, and the bottom plate is provided with a first position signal device; one end of the transmission device is connected with the driving device, and the other end is connected with the first position signal device and the second position signal device; and after the operating mechanism receives an operation instruction, the driving device drives the transmission device to respectively drive the first position signal device and the second position signal device to displace, and double-signal confirmation is carried out. The double-signal confirmation mechanism effectively avoids misjudgment possibly caused by a single signal, improves the accuracy of a position signal, and ensures that a background control system and protection equipment can carry out logic judgment based on accurate data.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage power transmission and transformation switches, and particularly relates to a three-position mechanism position signal operating mechanism and an isolating earthing switch. Background Art

[0002] In the rapid development and wide application of high-voltage power transmission and transformation systems, SF6 gas-insulated metal-enclosed switchgear (GIS) has become an indispensable core equipment in the fields of system operation and protection due to its excellent insulation performance, compact structure design, and high operation reliability. GIS integrates high-voltage electrical components such as circuit breakers, disconnector switches (DS), and earthing switches (ES) in a sealed metal housing filled with SF6 gas, effectively isolating the influence of the external environment and improving the safety and stability of the system.

[0003] Disconnector switches (DS) and earthing switches (ES), as key components in GIS, are responsible for ensuring the safe isolation and earthing of the system. They not only need to accurately and reliably open and close during normal operation but also must provide accurate position signals at any time to reflect the actual state of the switch. These position signals are usually sent by the operating mechanism used with the switch and serve as basic data for the background control system and protection equipment to make logical judgments, which is crucial for maintaining the safe operation of the entire high-voltage power transmission and transformation system.

[0004] However, in the prior art, there is a problem with the first position signal used by the operating mechanism for the interlocking function: this signal often occurs in advance before the actual switch reaches the stable current-carrying position. This asynchrony between the signal and the actual position of the switch may cause the background control system to misjudge the state of the switch, thereby triggering a series of serious consequences. For example, when the disconnector switch or earthing switch is not fully closed, if the control system mistakenly believes that it has been closed, it may wrongly allow current to pass through, causing the equipment insulation to bear undue voltage or current shocks. Over time, this may lead to a decline in insulation performance, and even serious accidents such as insulation failures and equipment burnout may occur.

[0005] In addition, the early occurrence of this position signal may also affect the correct operation of the protection equipment, making it impossible for the protection equipment to timely and accurately cut off the fault point during system failures, further increasing the safety risks of the system. Therefore, there is an urgent need for an operating mechanism that can accurately reflect the actual position state of the switch and whose signal is synchronized with the switch action to improve the operation reliability and safety of the high-voltage power transmission and transformation system and avoid equipment damage and safety accidents caused by misjudgment of position signals. Summary of the Invention

[0006] The object of the present invention is to provide a three-position mechanism position signal operating mechanism and an isolating earthing switch, so as to solve the technical defect in the prior art that signals are often sent in advance before the actual switch reaches the stable current-carrying position, resulting in the asynchrony between the signal and the actual position of the switch.

[0007] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, a three-position mechanism position signal operating mechanism is provided, including: A top plate and a bottom plate, a second position signal device is provided on the top plate, and a first position signal device is provided on the bottom plate; A transmission device, one end is connected to a driving device, and the other end is connected to the first position signal device and the second position signal device; After the operating mechanism receives an operation instruction, the driving device drives the transmission device, respectively drives the first position signal device and the second position signal device to displace, and performs double-signal confirmation.

[0008] Further, the transmission device includes a first transmission component and a second transmission component, and the first transmission component and the second transmission component are in transmission connection; The second position signal device includes a DS opening position monitoring switch, a DS closing position monitoring switch, an ES opening position monitoring switch, an ES closing position monitoring switch and a rack plate. The DS opening position monitoring switch and the DS closing position monitoring switch are located at one end of the top plate, and the ES opening position monitoring switch and the ES closing position monitoring switch are located at the other end of the top plate; The rack plate is arranged in the middle of the top plate, and the periphery of the rack plate is in contact with the DS opening position monitoring switch, the DS closing position monitoring switch, the ES opening position monitoring switch and the ES closing position monitoring switch; One end of the second transmission component is connected to the driving device, and the other end is connected to the rack plate; wherein, under the drive of the driving device, the second transmission component drives the rack plate to displace; The first position signal device includes a DS auxiliary switch assembly, a DS auxiliary switch driving board, an ES auxiliary switch driving board and an ES auxiliary switch assembly. The DS auxiliary switch driving board is arranged at one end of the bottom plate, and the ES auxiliary switch driving board is arranged at the other end of the bottom plate; The DS auxiliary switch assembly is connected to the DS auxiliary switch driving board, the ES auxiliary switch driving board is connected to the ES auxiliary switch assembly, one end of the first transmission component is connected to the driving device, and the other end is matched with the DS auxiliary switch driving board and the ES auxiliary switch driving board.

[0009] Further, the rack plate is of a U-shaped structure, and one side of the open end is provided with teeth, and the teeth are meshed with the second transmission component; The outer sides of the opposite sides of the rack plate are provided with convex contours, one of the convex contours cooperates with the DS opening position monitoring switch and the DS closing position monitoring switch, and the other convex contour cooperates with the ES opening position monitoring switch and the ES closing position monitoring switch; Guide grooves are provided at both ends of the rack plate where the convex contours are arranged. An installation plate is further provided on the top plate. One end of the second transmission assembly is connected to the installation plate, and the other end cooperates with the guide groove to drive the rack plate to displace left and right.

[0010] Furthermore, a pin is provided on the installation plate, and a guide sleeve is provided on the outside of the pin. The guide sleeve abuts against the rack plate and fixes the rack plate; The second transmission assembly includes a first spur gear, a second spur gear, a pinion gear, an output gear shaft and a shaft. One end of the shaft is hinged to the installation plate through a second bearing. The other end of the shaft is connected to the second spur gear and the pinion gear, and the output shaft gear is connected to the first spur gear; Wherein, the first spur gear and the second spur gear are meshed, and the pinion gear is meshed with the teeth.

[0011] Furthermore, the diameters of the first spur gear and the second spur gear are equal.

[0012] Furthermore, the second spur gear is hinged to the installation plate through a first bearing.

[0013] Furthermore, an auxiliary switch installation plate is connected to the DS auxiliary switch assembly and the ES auxiliary switch assembly. An end of the auxiliary switch installation plate is provided with a crank arm and a closing and opening indicator plate 36. An end of the crank arm is connected with a mounting nut. A driving pin is provided at an end of the mounting nut, and a shaft sleeve is provided on the driving pin; The first transmission assembly includes a cam and a ball screw pair. The cam is in transmission connection with the ball screw pair, and a nut is provided on the ball screw pair; The DS auxiliary switch driving plate and the ES auxiliary switch driving plate have the same structure and are both π-shaped. Long grooves are provided on the horizontal ends of the DS auxiliary switch driving plate and the ES auxiliary switch driving plate, and the nut is slidably connected to the long grooves; One of the vertical ends of the DS auxiliary switch driving plate and the ES auxiliary switch driving plate is bent and provided with a U-shaped groove, and the U-shaped groove cooperates with the driving pin.

[0014] Furthermore, the nut is located in the long groove.

[0015] Furthermore, the long groove is composed of a first section of long groove, a second section of long groove and a third section of long groove. Both the first section of long groove and the third section of long groove are inclined, and the second section of long groove is horizontal.

[0016] In a second aspect, an isolating earthing switch is provided, which includes a switch body, and the above-mentioned three-position mechanism position signal operating mechanism is installed on the switch body.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The first position signal device and the second position signal device in the operating mechanism are respectively arranged on the bottom plate and the top plate. This dual-signal design provides double guarantees for the confirmation of the switch position. When the operating mechanism receives an operation instruction, the driving device drives the transmission device to drive the first position signal device and the second position signal device to displace respectively. Only when both position signal devices confirm that the switch has reached the stable current-carrying position, a position signal will be sent. This dual-signal confirmation mechanism effectively avoids misjudgment that may occur with a single signal, improves the accuracy of the position signal, and ensures that the background control system and protection equipment can perform logical judgments based on accurate data.

[0018] 2. By arranging a DS opening position monitoring switch, a DS closing position monitoring switch, an ES opening position monitoring switch, and an ES closing position monitoring switch on the top plate, as well as a rack plate in contact with them, refined monitoring of the opening and closing positions of the disconnector and the earthing switch is achieved. The displacement of the rack plate directly reflects the actual position state of the switch. By contacting with each position monitoring switch, it can accurately and reliably send a position signal, improving the accuracy and reliability of position monitoring.

[0019] 3. The U-shaped structure of the rack plate and the teeth on one side of the open end thereof are engaged with the second transmission component, achieving precise transmission control. The teeth ensure the stability and accuracy during the transmission process, enabling the rack plate to displace along a predetermined trajectory. By the engagement of the teeth with the second transmission component, the displacement amount of the rack plate can be precisely controlled, thereby accurately reflecting the opening and closing positions of the disconnector and the earthing switch.

[0020] 4. The pin installed on the mounting plate and the guiding sleeve on the outside are abutted against the rack plate to fix the rack plate and at the same time provide a stable guiding function. The design of the guiding sleeve ensures that the rack plate can maintain linear motion during displacement, avoiding deviation or shaking, thereby improving the accuracy and reliability of position monitoring.

[0021] 5. When gears with equal diameters are engaged in transmission, they can maintain the same linear velocity, which means that the rotational speed of the first spur gear will be directly equal to the rotational speed of the second spur gear, achieving constant-speed transmission.

[0022] 6. The first bearing provides stable support for the second spur gear, ensuring that it can rotate freely on the mounting plate.

[0023] 7. The end of the auxiliary switch mounting plate is provided with a closing and opening indicator plate 36, which can intuitively display the closing and opening states of the switch. Secondly, the design of the closing and opening indicator plate 36 improves the operation convenience and safety of the equipment. The operator can quickly understand the state of the switch and avoid misoperation.

[0024] 8. The nut is located in the long slot and can reliably drive the drive pin, thereby realizing the rotation of the toggle arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 Overall schematic diagram of the three-position mechanism position signal operating mechanism provided by the present invention; Figure 2 For the present invention Figure 1 Cross-sectional view taken along line A-A; Figure 3 Schematic diagram of the second position signal device in the three-position mechanism position signal operating mechanism provided by the present invention; Figure 4 For the present invention Figure 2 Cross-sectional view taken along line A-A; Figure 5 Schematic diagram of the rack plate structure in the three-position mechanism position signal operating mechanism provided by the present invention; Figure 6 Schematic diagram of the first position signal device in the three-position mechanism position signal operating mechanism provided by the present invention; Figure 7 Schematic diagram of the DS auxiliary switch drive plate structure in the three-position mechanism position signal operating mechanism provided by the present invention; Figure 8 For the present invention Figure 7 Right view; Figure 9 Schematic diagram of the DS auxiliary switch assembly structure in the three-position mechanism position signal operating mechanism provided by the present invention; Figure 10 For the present invention Figure 9 Cross-sectional view taken along line A-A; Figures 11 - 13 Schematic diagram of the first position signal indication state in the three-position mechanism position signal operating mechanism provided by the present invention; In the figure: 1, top plate; 2, output gear shaft; 3, second position signal device; 5, cam; 6, ball screw pair; 8, bottom plate; 9, DS opening position monitoring switch; 10, second spur gear; 11, DS closing position monitoring switch; 12, washer; 13, screw; 14, ES opening position monitoring switch; 15, guide sleeve; 16, pin shaft; 17, pinion; 18, ES closing position monitoring switch; 19, first spur gear; 20, rack plate; 21, lining plate; 22, mounting plate; 23, first bearing; 24, shaft; 25, second bearing; 26, flat key; 27, small bearing; 28, DS auxiliary switch assembly; 29, DS auxiliary switch driving plate; 30, ES auxiliary switch driving plate; 31, ES auxiliary switch assembly; 32, DS auxiliary switch; 33, auxiliary switch mounting plate; 34, toggle arm; 35, joint; 36, opening and closing indicator plate 36; 37, bushing; 38, driving pin; 39, mounting nut; 40, main shaft; 41, gear; 42, first motor; 43, side plate; 44, tapered roller bearing; 45, second motor. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0032] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "linked" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] In the rapid development and wide application of the high-voltage power transmission and transformation system, the SF6 gas-insulated switchgear (GIS) has become an indispensable core device in the field of system operation and protection with its excellent insulation performance, compact structure design, and high operation reliability. GIS integrates high-voltage electrical components such as circuit breakers, disconnectors (DS), earthing switches (ES), etc. in a sealed metal shell filled with SF6 gas, effectively isolating the influence of the external environment and improving the safety and stability of the system.

[0034] As key component units in GIS, the disconnector (DS) and the earthing switch (ES) are responsible for ensuring the safe isolation and grounding of the system. They not only need to accurately and reliably open and close during normal operation, but also must be able to provide accurate position signals at any time to reflect the actual state of the switch. These position signals are usually sent by the operating mechanism used with the switch and serve as the basic data for the background control system and protection equipment to make logical judgments, which is crucial for maintaining the safe operation of the entire high-voltage power transmission and transformation system.

[0035] However, in the prior art, there is a problem with the first position signal of the operating mechanism for the interlocking function: this signal often occurs prematurely before the actual switch reaches the stable current-carrying position. This asynchrony between the signal and the actual position of the switch may cause the background control system to misjudge the state of the switch, and thus trigger a series of serious consequences. For example, when the disconnecting switch or earthing switch is not fully closed, if the control system mistakenly believes that it has been closed, it may wrongly allow current to pass through, causing the equipment insulation to withstand undue voltage or current shocks. Over time, this may lead to a decline in insulation performance, and even serious accidents such as insulation failure and equipment burnout.

[0036] In addition, the premature occurrence of this position signal may also affect the correct operation of the protection equipment, making it impossible for the protection equipment to timely and accurately cut off the fault point during a system fault, further exacerbating the safety risks of the system. Therefore, there is an urgent need for an operating mechanism that can accurately reflect the actual position state of the switch and whose signal occurrence is synchronized with the switch action, in order to improve the operation reliability and safety of the high-voltage power transmission and transformation system, and avoid equipment damage and safety accidents caused by misjudgment of the position signal.

[0037] To solve the above technical defects, the inventor provides an operating mechanism for the three-position mechanism position signal and a disconnector earthing switch.

[0038] The following further describes the present invention in detail with reference to the accompanying drawings: In a first aspect, an embodiment of the present invention provides an operating mechanism for the three-position mechanism position signal, as Figures 1 - 13As shown, it includes a top plate 1 and a bottom plate 8. A second position signal device 3 is provided on the top plate 1, and a first position signal device is provided on the bottom plate 8; a transmission device, one end of which is connected to a driving device, and the other end is connected to the first position signal device and the second position signal device 3; after the operating mechanism receives an operation instruction, the driving device drives the transmission device to drive the first position signal device and the second position signal device 3 to displace respectively, and double-signal confirmation is performed. In the above structure, since the first position signal device and the second position signal device 3 are respectively arranged on the bottom plate 8 and the top plate 1, it provides double guarantee for the confirmation of the switch position. When the operating mechanism receives an operation instruction, the driving device drives the transmission device to drive the first position signal device and the second position signal device 3 to displace respectively. Only when both position signal devices confirm that the switch has reached the stable current-carrying position will a position signal be issued. This double-signal confirmation mechanism effectively avoids the misjudgment that may occur in a single signal, improves the accuracy of the position signal, and ensures that the background control system and protection equipment can make logical judgments based on accurate data. Secondly, through the precise cooperation between the transmission device and the driving device, this operating mechanism can ensure that the issuance of the position signal is synchronized with the actual action of the switch. When the switch is fully closed or opened in place, the position signal will be issued, avoiding the problem of early signal issuance in the prior art. The synchronization of the signal and the switch action ensures that the background control system can timely and accurately grasp the state of the switch, thus making correct control decisions, and at the same time improving the reliability of the position signal. In addition, a reliable position signal can ensure that the protection equipment can timely and accurately cut off the fault point in case of a system fault, avoiding equipment damage and safety accidents caused by misjudgment of the position signal, significantly improving the operation reliability and safety of the high-voltage power transmission and transformation system, and providing a strong guarantee for the stable operation of the system.

[0039] Furthermore, as Figure 3As shown, the transmission device includes a first transmission component and a second transmission component. The first transmission component and the second transmission component are in transmission connection, realizing the coordinated control of the driving device over the rack plate 20 and the auxiliary switch driving plate. The second position signal device 3 includes a DS opening position monitoring switch 9, a DS closing position monitoring switch 11, an ES opening position monitoring switch 14, an ES closing position monitoring switch 18, and a rack plate 20. The DS opening position monitoring switch 9 and the DS closing position monitoring switch 11 are located at one end of the top plate 1, and the ES opening position monitoring switch 14 and the ES closing position monitoring switch 18 are located at the other end of the top plate 1; the rack plate 20 is arranged in the middle of the top plate 1, and the periphery of the rack plate 20 is in contact with the DS opening position monitoring switch 9, the DS closing position monitoring switch 11, the ES opening position monitoring switch 14, and the ES closing position monitoring switch 18; by arranging the DS opening position monitoring switch 9, the DS closing position monitoring switch 11, the ES opening position monitoring switch 14, and the ES closing position monitoring switch 18 on the top plate 1, and the rack plate 20 in contact with them, the refined monitoring of the opening and closing positions of the disconnector DS and the earthing switch ES is realized, and the displacement of the rack plate 20 directly reflects the actual position state of the switch. By contacting with each position monitoring switch, the position signal can be sent accurately and reliably, improving the accuracy and reliability of position monitoring.

[0040] One end of the second transmission component is connected to the driving device, and the other end is connected to the rack plate 20; wherein, driven by the driving device, the second transmission component drives the rack plate 20 to displace; the first position signal device includes a DS auxiliary switch assembly 28, a DS auxiliary switch driving plate 29, an ES auxiliary switch driving plate 30, and an ES auxiliary switch assembly 31. The DS auxiliary switch driving plate 29 is arranged at one end of the bottom plate 8, and the ES auxiliary switch driving plate 30 is arranged at the other end of the bottom plate 8; the DS auxiliary switch assembly 28 is connected to the DS auxiliary switch driving plate 29, the ES auxiliary switch driving plate 30 is connected to the ES auxiliary switch assembly 31, one end of the first transmission component is connected to the driving device, and the other end cooperates with the DS auxiliary switch driving plate 29 and the ES auxiliary switch driving plate 30. The second transmission component is responsible for driving the rack plate 20 to displace and confirming the position state of the switch by contacting with the position monitoring switch; the first transmission component cooperates with the DS auxiliary switch driving plate 29 and the ES auxiliary switch driving plate 30 to further confirm and transmit the position signal. This design of the double transmission components improves the transmission efficiency and stability of the operating mechanism and ensures the accurate transmission of the position signal. In addition, the DS auxiliary switch assembly 28 and the ES auxiliary switch assembly 31 arranged on the bottom plate 8, and the auxiliary switch driving plates cooperating with them form a redundant confirmation mechanism for the position signal. Even if there is a problem with the contact between the rack plate 20 and the position monitoring switch, the auxiliary switch assembly can provide additional confirmation of the position signal, improving the fault tolerance and reliability of the system.

[0041] As shown Figure 5 in the figure, the rack plate 20 has a U-shaped structure, and teeth are provided on one side of the open end. The teeth are engaged with the second transmission component, achieving precise transmission control. The design of the teeth ensures the stability and accuracy during the transmission process, enabling the rack plate 20 to displace along a predetermined trajectory. Moreover, through the engagement of the teeth with the second transmission component, the displacement amount of the rack plate 20 can be precisely controlled, thereby accurately reflecting the opening and closing positions of the disconnector DS and the earthing switch ES. Convex profiles are provided on the opposite outer sides of the rack plate 20. One convex profile cooperates with the DS opening position monitoring switch 9 and the DS closing position monitoring switch 11, and the other convex profile cooperates with the ES opening position monitoring switch 14 and the ES closing position monitoring switch 18. When the rack plate 20 is displaced, it can simultaneously trigger the corresponding position monitoring switches, realizing the simultaneous monitoring of multiple positions and improving the efficiency and accuracy of position monitoring. Guide grooves are provided at both ends of the rack plate 20 where the convex profiles are arranged. An installation plate 22 is also provided on the top plate 1. One end of the second transmission component is connected to the installation plate 22, and the other end cooperates with the guide grooves to drive the rack plate 20 to displace left and right. The design of the guide grooves provides a stable guiding effect for the displacement of the rack plate 20, ensuring the linearity and stability of the rack plate 20 during displacement and avoiding position monitoring errors caused by deviation or shaking.

[0042] As shown Figure 4 in the figure, a pin shaft 16 is provided on the installation plate 22, and a guide sleeve 15 is provided on the outer side of the pin shaft 16. The guide sleeve 15 abuts against the rack plate 20 and fixes the rack plate 20. The pin shaft 16 provided on the installation plate 22 and the guide sleeve 15 on the outer side abut against the rack plate 20 to fix the rack plate 20 and at the same time provide a stable guiding effect. The design of the guide sleeve 15 ensures that the rack plate 20 can maintain linear motion during displacement, avoiding deviation or shaking, thereby improving the accuracy and reliability of position monitoring. The second transmission component includes a first spur gear 19, a second spur gear 10, a pinion 17, an output gear shaft 2, and a shaft 24. One end of the shaft 24 is hinged to the installation plate 22 through a second bearing 25. The other end of the shaft 24 is connected to the second spur gear 10 and the pinion 17, and the output gear shaft 2 is connected to the first spur gear 19. Among them, the first spur gear 19 and the second spur gear 10 are engaged, and the pinion 17 is engaged with the teeth. The second transmission component includes a first spur gear 19, a second spur gear 10, a pinion 17, an output gear shaft 2, and a shaft 24, constituting an efficient gear transmission system. One end of the shaft 24 is hinged to the installation plate 22 through a second bearing 25, and the other end is connected to the second spur gear 10 and the pinion 17, realizing the transmission and conversion of the driving force. The first spur gear 19 is engaged with the second spur gear 10, and the pinion 17 is engaged with the teeth of the rack plate 20, forming a stable transmission chain and ensuring the accuracy and efficiency of the transmission.

[0043] In this embodiment, the first spur gear 19 and the second spur gear 10 have the same diameter. The second spur gear 10 is hinged to the mounting plate 22 through the first bearing 23. When gears with the same diameter are engaged in transmission, they can maintain the same linear velocity. The rotational speed of the first spur gear 19 will be directly equal to the rotational speed of the second spur gear 10, achieving constant-speed transmission and ensuring the stability and consistency of the transmission. Secondly, when gears with the same diameter are engaged, the contact pressure distribution on the tooth surface is more uniform, reducing the possibility of local wear and being easy to maintain. The first bearing 23 provides stable support for the second spur gear 10 to ensure that it can rotate freely on the mounting plate 22. At the same time, the hinged design of the bearing reduces friction and wear, making the rotation of the second spur gear 10 smoother and more stable.

[0044] As Figures 6 - 8 shown, an auxiliary switch mounting plate 33 is connected to the DS auxiliary switch assembly 28 and the ES auxiliary switch assembly 31. An arm 34 and a closing and opening indicator plate 36 are provided at the end of the auxiliary switch mounting plate 33. The closing and opening indicator plate 36 is provided at the end of the auxiliary switch mounting plate 33, which can visually display the closing and opening states of the switch, improving the operation convenience and safety of the equipment. The operator can quickly understand the state of the switch and avoid misoperation.

[0045] A mounting nut 39 is connected to the end of the arm 34. A drive pin 38 is provided at the end of the mounting nut 39, and a bushing 37 is provided on the drive pin 38. The first transmission assembly includes a cam 5 and a ball screw pair 6. The cam 5 is in transmission connection with the ball screw pair 6, and a nut is provided on the ball screw pair 6. The transmission mechanism of converting rotational motion into linear motion is achieved by the transmission connection between the cam 5 and the ball screw pair 6. The nut on the ball screw pair 6 is slidably connected to the long grooves on the horizontal ends of the DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30, making the transmission more flexible and reliable. The DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30 have the same structure and are both π-shaped. Long grooves are opened on the horizontal ends of the DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30, and the nut is slidably connected to the long grooves. One of the vertical ends of the DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30 is bent and provided with a U-shaped groove, which cooperates with the drive pin 38.

[0046] The vertical ends of the DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30 are bent and provided with a U-shaped groove, which cooperates with the drive pin 38. The drive pin 38 is provided with a shaft sleeve 37, which enhances the stability and durability of the drive connection and ensures the accuracy and reliability of the transmission. The DS auxiliary switch drive plate 29 and the ES auxiliary switch drive plate 30 both adopt a π-shaped design, and a long groove is provided on the horizontal end. This design makes the drive plate have a certain adaptability. The design of the long groove allows the nut to slide within a certain range, adapts to the needs of different transmission strokes, and improves the versatility and flexibility of the equipment. Specifically, the long groove is composed of a first section of the long groove, a second section of the long groove, and a third section of the long groove. The first section of the long groove and the third section of the long groove are both inclined, and the second section of the long groove is horizontal, and the nut is located in the long groove. The inclined long groove section can cause the nut to generate a vertical or horizontal displacement component during the movement process. By adjusting the inclination angle of the long groove, the displacement amount and direction of the nut can be accurately controlled. The horizontal second long groove provides a stable transmission stage for the nut, during which the nut can move smoothly and reduce vibration and shaking during the transmission process.

[0047] When this solution is applied specifically, the main shaft 40 is arranged between the top plate 1 and the bottom plate 8, the cam 5 and the gear 41 are connected to the main shaft 40 through a hexagonal connection, and the output gear shaft 2 is meshed with the gear 41; the ball screw pair 6 is hinged to the side plate 43 through a tapered roller bearing 44 to limit its degree of freedom along the axial direction; the output gear shaft 2 is fixed to the second position signal device 3 through a hexagonal socket and a screw 13; the DS auxiliary switch drive board 29 and the ES auxiliary switch drive board 30 are hinged to the bottom plate 8 through a number of regularly arranged small bearings 27, and their translational motion on the bottom plate 8 is limited by washers 12 with the same number as the small bearings 27.

[0048] The switching positions of the DS opening position monitoring switch 9, the DS closing position monitoring switch 11, the ES opening position monitoring switch 14 and the ES closing position monitoring switch 18 correspond to the raised profile on the rack plate 20. The rack plate 20 is hinged to the mounting plate 22 through a number of pins 16 and guide sleeves 15, and is restricted to perform translational motion on the mounting plate 22 by washers 12 having the same number as the pins 16. The teeth on the rack plate 20 mesh with the pinion 17, and the pinion 17 is fixedly connected to the shaft 24 with the second spur gear 10 through a flat key 26. One end of the shaft 24 is hinged to the mounting plate 22 through a second bearing 25, and the second spur gear 10 meshes with the first spur gear 19 hinged to the mounting plate 22 through a first bearing 23. The inner hexagon provided on the first spur gear 19 is used in conjunction with the outer hexagon on the output gear shaft 2. After the lining plate 21 is fixedly connected to the mounting plate 22, the remaining degrees of freedom of the first bearing 23 and the second bearing 25 can be restricted except for rotation.

[0049] The DS auxiliary switch assembly 28 and the ES auxiliary switch assembly 31 have similar structures, including an auxiliary switch mounting plate 33 and an auxiliary switch 32 arranged on the auxiliary switch mounting plate 33; a crank arm 34 is provided on the square shaft sleeve of the auxiliary switch 32, one end of the crank arm 34 is provided with a driving pin 38 and is locked by a mounting nut 39, one end of the driving pin 38 is provided with a shaft sleeve 37, and at one end of the square shaft of the auxiliary switch 32, there is also a closing and opening indicating plate 36 connected through a joint 35.

[0050] The first position signal device drives the DS auxiliary switch driving plate 29 and the ES auxiliary switch driving plate 30 by the ball screw pair 6, and then drives the DS auxiliary switch assembly 28 and the ES auxiliary switch assembly 31 to send position signals at preset positions respectively; the second position signal device 3 is driven by the output gear shaft 2, and then drives the rack plate 20 to make a linear reciprocating motion, and at the preset position, switches its respective micro switches to send position signals.

[0051] In the rack plate 20, convex profiles based on reference marks are respectively arranged on both sides of the plate strip. At the starting ends on both sides of the convex profiles, transition sections with an angle of α are provided. Guide grooves with a width of d are also arranged through both sides of the plate strip. On one side of the hollow part in the middle of the plate strip, several teeth are provided. The DS auxiliary switch driving plate 29 is in the shape of a plate strip in the shape of "π". A long groove with a width of h is arranged on the plate strip. Transition sections with angles of α and β are respectively arranged at both ends of the long groove. The distance between the three long grooves before and after the transition is a preset value "l". Several guide grooves with a width of d are also arranged on the plate strip. One corner of the "π" is set as a bent convex, and a "U" - shaped groove with a width of f and a length of g is opened. Specifically, the ES auxiliary switch driving plate 30 and the DS auxiliary switch driving plate 29 are in a mirror image relationship. After the DS auxiliary switch driving plate 29 and the DS auxiliary switch assembly 28 are combined, the three long grooves and their transition sections arranged on the DS auxiliary switch driving plate 29 form an intermittent motion trajectory under the driving of the ball screw pair 6. Observed from the direction of the closing and opening indicating plate 36, it presents three stable states of "opening", "half - open and half - closed", "closing", and two transient transition processes from "opening" to "half - open and half - closed" and from "half - open and half - closed" to "closing".

[0052] After the ES auxiliary switch driving plate 30 and the ES auxiliary switch assembly 31 are combined, it has a mirror image relationship with the intermittent motion formed by the DS auxiliary switch driving plate 29 and the DS auxiliary switch assembly 28. After the driving pin 38, the crank arm 34 and the DS auxiliary switch driving plate 29 or the ES auxiliary switch driving plate 30 cooperate, the "U" - shaped groove opened on the DS auxiliary switch driving plate 29 or the ES auxiliary switch driving plate 30 happens to be adapted to the shaft sleeve 37 sleeved at one end of the driving pin 38. Obviously, the translational stroke of the DS auxiliary switch driving plate 29 or the ES auxiliary switch driving plate 30 corresponds to the rotation angle θ of the crank arm 34.

[0053] As shown in the figure Figure 6 、 Figure 10 and Figure 11 After the DS auxiliary switch drive board 29 and the DS auxiliary switch assembly 28 are combined, the three long slots and their transition sections provided on the DS auxiliary switch drive board 29 form an intermittent motion trajectory under the driving action of the ball screw pair 6. Taking the conversion process of the first DS closing position signal as an example, the nut in the ball screw pair 6 starts to move linearly to the left. When it moves to the transition section between the first long slot and the second long slot, the DS auxiliary switch drive board 29 moves upward under the pushing action of the nut in the ball screw pair 6. At the same time, the U-shaped slot on the DS auxiliary switch drive board 29 pushes the drive pin 38 in the DS auxiliary switch assembly 28 to move accordingly. Observed from the direction of the closing and opening indicator board 36, the closing and opening indicator board 36 first rotates counterclockwise by θ / 2, presenting a state conversion from "open" to "half open and half closed". The nut in the ball screw pair 6 continues to move to the left. Obviously, the DS auxiliary switch drive board 29 remains stationary in the second long slot until the nut in the ball screw pair 6 moves to the transition section between the second long slot and the third long slot. The DS auxiliary switch drive board 29 continues to move upward under the pushing action of the nut in the ball screw pair 6. At the same time, the U-shaped slot on the DS auxiliary switch drive board 29 pushes the drive pin 38 in the DS auxiliary switch assembly 28 to move accordingly. Observed from the direction of the closing and opening indicator board 36, the closing and opening indicator board 36 rotates counterclockwise by θ / 2 again, presenting a state conversion from "half open and half closed" to "closed". It should be noted that at the end of the transition section between the second long slot and the third long slot, the state of the DS auxiliary switch 32 in the DS auxiliary switch assembly 28 changes, sending out a closing signal. It can be seen that observed from the direction of the closing and opening indicator board 36, there are three stable states of "open", "half open and half closed", "closed" and two transient transition processes from "open" to "half open and half closed" and from "half open and half closed" to "closed".

[0054] Except for the opposite direction, the conversion process of the first DS opening position signal is the same as that of the DS closing process. After the ES auxiliary switch drive board 30 and the ES auxiliary switch assembly 31 are combined, they are in a mirror image relationship with the intermittent motion formed by the DS auxiliary switch drive board 29 and the DS auxiliary switch assembly 28. Obviously, except for the opposite direction, the conversion processes of the first ES closing and opening position signals are exactly the same as those of the DS closing and opening processes.

[0055] Brief description of the action mechanism of the first position signal of the three-position mechanism The three-position mechanism has positions where both the disconnector (DS) and the earthing switch (ES) are in the open position; three working positions where the disconnector (DS) is in the closed position, the earthing switch (ES) is in the open position, and the earthing switch (ES) is in the closed position and the disconnector (DS) is in the open position. No matter which working position the mechanism reaches, accurate position signals should be sent out.

[0056] Taking the signal conversion process of the first position of the electric - operated isolating DS closing as an example, please refer to Figure 1 and Figure 6 , after the mechanism receives the DS isolating closing instruction, the second motor 45 on the DS side drives the nut in the ball screw pair 6 to start moving linearly to the left; First, the nut of the ball screw pair 6 moves in the first - stage long slot of the DS auxiliary switch driving plate 29. At this time, the DS auxiliary switch driving plate 29 remains stationary. When the nut of the ball screw pair 6 moves to the transition section with an inclination angle of β, the nut in the ball screw pair 6 drives the DS auxiliary switch driving plate 29 to move upward. Until the nut in the ball screw pair 6 moves into the second - stage long slot, after the DS auxiliary switch driving plate 29 moves upward by a certain distance, it stops moving again.

[0057] Meanwhile, please refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , the "U" - shaped groove opened on the DS auxiliary switch driving plate 29 drives the drive sleeve 37 and its coaxial drive pin 38 to act, thereby driving the toggle arm 34 to rotate an angle of θ / 2. Observed from the direction of the closing - opening indicator plate 36, the closing - opening indicator plate 36 first rotates counterclockwise by θ / 2. Obviously, please refer to Figure 10 , during this process, observed from the direction of the closing - opening indicator plate 36, the closing - opening indicator plate 36 presents a "switch - off" stable state, a transient transition process from "switch - off" to "half - closed and half - open", and a "half - closed and half - open" stable state. As the nut in the ball screw pair 6 continues to move linearly to the left, obviously the DS auxiliary switch driving plate 29 remains stationary in the second - stage long slot.

[0058] When the nut in the ball screw pair 6 moves to the transition section with an inclination angle of α, the DS auxiliary switch driving plate 29 moves upward again. When the nut in the ball screw pair 6 moves into the third long groove, after the DS auxiliary switch driving plate 29 moves a certain distance, it stops moving again. The nut in the ball screw pair 6 continues to move leftward in a straight line. Obviously, the DS auxiliary switch driving plate 29 remains stationary in the second long groove until the nut in the ball screw pair 6 moves to the transition section between the second long groove and the third long groove. Then, under the pushing action of the nut in the ball screw pair 6, the DS auxiliary switch driving plate 29 continues to move upward. At the same time, the "U"-shaped groove opened on the DS auxiliary switch driving plate 29 drives the drive sleeve 37 and its coaxial drive pin 38 to act, and then drives the toggle arm 34 to rotate by an angle θ / 2. Obviously, during this process, when observed from the direction of the closing and opening indicator plate 36, the closing and opening indicator plate 36 presents a "half open and half closed" stable state, a transient transition process from "half open and half closed" to "closed", and a "closed" stable state. It should be noted that at the end of the transition section between the second long groove and the third long groove, the state of the DS auxiliary switch 32 in the DS auxiliary switch assembly 28 changes, and a first position signal of the DS closing state is issued.

[0059] When the nut in the ball screw pair 6 moves into the third long groove of the DS auxiliary switch driving plate 29, the cam 5 has also reached the closing position before this. Obviously, the first position signal is issued after the main body reaches the closing position with a delay. Therefore, at the moment when the first position signal is issued, it fully meets the condition that it is allowed to be issued only after the main wiring of the equipment is stably conducting current. Therefore, it can be seen that the DS electric operation opening process is the same as the DS closing process except for the opposite movement direction. Coincidentally, when the ball screw pair 6 moves into the first long groove, the DS auxiliary switch resets and issues a first position signal of the DS opening state.

[0060] The ES electric operation closing and opening processes are exactly the same as the DS closing and opening processes. The difference is that when observed from the direction of the closing and opening indicator plate 36, the rotation directions of the two transient transition processes from "open" to "half open and half closed" and from "half open and half closed" to "closed" are opposite to those of the DS.

[0061] Brief description of the action mechanism of the second position signal of the three-position mechanism: As Figure 3 and Figure 5As shown, the mechanism is in the positions of DS opening and ES opening. The raised contours with a width of a provided on both sides of the rack plate 20 just make the DS opening position monitoring switch 9 and the ES opening position monitoring switch 14 in a compressed state. The background control device will detect this signal and determine that the mechanism is in the positions of DS opening and ES opening. Still taking the electric operation of DS closing as an example, after the mechanism receives the DS closing command, the second motor 45 on the DS side of the mechanism drives the ball screw pair 6 to move linearly, thereby driving the cam 5 to rotate counterclockwise. The gear 41 fixedly connected to the cam 5 through the hexagon of the main shaft 40 rotates counterclockwise accordingly, and then drives the output gear shaft 2 meshing with the gear 41 to rotate clockwise. The first spur gear 19 connected to the output gear shaft 2 through the hexagon also rotates clockwise accordingly, and then drives the second spur gear 10 meshing with it to rotate counterclockwise. At the same time, the pinion 17 fixedly connected to the shaft 24 through the flat key 26 with the second spur gear 10 also rotates counterclockwise synchronously, driving the rack plate 20 meshing with the pinion 17 to move horizontally to the right.

[0062] During the DS closing process of the mechanism, first, the raised contour provided on the rack plate 20 leaves the position of the DS opening position monitoring switch 9, causing the state of the DS opening position monitoring switch 9 to change. At this time, the background control system determines that the DS of the mechanism is in the half-open and half-closed position. Until the mechanism reaches the DS closing position, the output gear shaft 2 of the mechanism stops rotating. At the same time, the rack plate 20 happens to move to the position where the raised contour provided on it just makes the DS closing position monitoring switch 11 in a switching state, and the DS closing position monitoring switch 11 sends out a holding signal for the closing position; Obviously, during this process, the states of the ES opening position monitoring switch 14 and the ES closing position monitoring switch 18 do not change, and the background control system determines that the mechanism is in the DS closing position. Obviously, during the DS electric operation opening process, except that the movement direction is opposite, the rest is the same as the DS closing process. The mechanism moves to the positions of DS opening and ES opening again, and the DS opening position monitoring switch 9 and the ES opening position monitoring switch 14 send out holding signals for the opening position.

[0063] Similarly, in the ES electric operation closing and opening processes, they are exactly the same as the DS closing and opening processes except for the direction of movement. The difference is that the rack plate 20 moves horizontally to the left. After ES reaches the closing position, the ES closing position monitoring switch 18 sends out a holding signal for the closing position. Obviously, during this process, the states of both the DS opening position monitoring switch 9 and the ES closing position monitoring switch 18 do not change. After ES reaches the opening position, the mechanism is again in the positions of DS opening and ES opening. Thus, it can be seen that the operating mechanism of this embodiment can not only obtain the first position signal sent after the switch equipped is in the stable current-carrying position by the auxiliary switch drive chain, but also directly obtain the second position signal from the output gear shaft 2 of the mechanism. Both position signals are sent at the end of the stroke, which can meet the requirements of the "double confirmation" function of the power grid company for two different-source position signals of the three-position mechanism, providing guarantee for the safe operation of the equipment.

[0064] It should be noted that in this embodiment, the driving device also includes a first driving component and a second driving component. The first driving component includes a first motor 42 and a first motor mounting plate, and the second driving component includes a second motor 45 and a second motor mounting plate. When driving the first position signal device and the second position signal device through the transmission device, there is no limitation on which driving component is specifically used. It can be understood that Figure 1 it is only for example.

[0065] In the second aspect, an isolating earthing switch is provided, which includes a switch body, and the three-position mechanism position signal operating mechanism as described above is installed on the switch body. The three-position mechanism position signal operating mechanism is closely integrated with the switch body, which can ensure the accuracy and reliability of the position signal transmission, reduce equipment failures caused by signal transmission errors or delays, and improve the reliability of the entire isolating earthing switch system.

[0066] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the scope of its protection. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent replacements to the specific implementation manners of the invention, but these changes, modifications or equivalent replacements are all within the scope of the claims of the invention pending approval.

Claims

1. A three-station mechanism position signal operating mechanism, characterized in that: include: A top plate (1) and a bottom plate (8), wherein the top plate (1) is provided with a second position signal device (3), and the bottom plate (8) is provided with a first position signal device; A transmission device, one end of which is connected to the driving device, and the other end of which is connected to the first position signal device and the second position signal device (3); After the operating mechanism receives the operation instruction, the driving device drives the transmission device to respectively drive the first position signal device and the second position signal device (3) to move, and perform double signal confirmation.

2. The three-position mechanism position signal operating mechanism according to claim 1, characterized in that: The transmission device comprises a first transmission assembly and a second transmission assembly, wherein the first transmission assembly and the second transmission assembly are transmission-connected with each other; The second position signal device (3) comprises a DS opening position monitoring switch (9), a DS closing position monitoring switch (11), an ES opening position monitoring switch (14), an ES closing position monitoring switch (18) and a rack plate (20), wherein the DS opening position monitoring switch (9) and the DS closing position monitoring switch (11) are located at one end of the top plate (1), and the ES opening position monitoring switch (14) and the ES closing position monitoring switch (18) are located at the other end of the top plate (1); The rack plate (20) is arranged in the middle of the top plate (1), and the four sides of the rack plate (20) are in contact with the DS opening position monitoring switch (9), the DS closing position monitoring switch (11), the ES opening position monitoring switch (14), and the ES closing position monitoring switch (18); One end of the second transmission component is connected to the driving device, and the other end is connected to the rack plate (20); wherein, under the drive of the driving device, the second transmission component drives the rack plate (20) to move; The first position signal device comprises a DS auxiliary switch assembly (28), a DS auxiliary switch drive board (29), an ES auxiliary switch drive board (30) and an ES auxiliary switch assembly (31), wherein the DS auxiliary switch drive board (29) is arranged at one end of the bottom plate (8), and the ES auxiliary switch drive board (30) is arranged at the other end of the bottom plate (8); The DS auxiliary switch assembly (28) is connected to a DS auxiliary switch drive board (29), the ES auxiliary switch drive board (30) is connected to an ES auxiliary switch assembly (31), one end of the first transmission assembly is connected to a drive device, and the other end cooperates with the DS auxiliary switch drive board (29) and the ES auxiliary switch drive board (30).

3. The three-position mechanism position signal operating mechanism according to claim 2, characterized in that: The rack plate (20) is a U-shaped structure, and one side of its open end is provided with teeth, and the teeth are meshed with the second transmission component; The rack plate (20) is provided with raised profiles on the opposite outer sides, one of the raised profiles cooperates with the DS opening position monitoring switch (9) and the DS closing position monitoring switch (11), and the other raised profile cooperates with the ES opening position monitoring switch (14) and the ES closing position monitoring switch (18); Guide grooves are provided at both ends of the raised profile of the rack plate (20), a mounting plate (22) is also provided on the top plate (1), one end of the second transmission assembly is connected to the mounting plate (22), and the other end cooperates with the guide groove to drive the rack plate (20) to move left and right.

4. The three-position mechanism position signal operating mechanism according to claim 3, characterized in that: An axle pin (16) is provided on the mounting plate (22), a guide sleeve (15) is provided on the outer side of the axle pin (16), and the guide sleeve (15) abuts against the rack plate (20) and fixes the rack plate (20); The second transmission assembly comprises a first spur gear (19), a second spur gear (10), a pinion gear (17), an output gear shaft (2) and a shaft (24); one end of the shaft (24) is hinged to the mounting plate (22) via a second bearing (25); the other end of the shaft (24) is connected to the second spur gear (10) and the pinion gear (17); and the output shaft gear (2) is connected to the first spur gear (19); The first spur gear (19) is meshed with the second spur gear (10), and the pinion gear (17) is meshed with the teeth.

5. The three-position mechanism position signal operating mechanism according to claim 4, characterized in that: The diameters of the first spur gear (19) and the second spur gear (10) are equal.

6. The three-position mechanism position signal operating mechanism according to claim 4, characterized in that: The second spur gear (10) is hinged to the mounting plate (22) via a first bearing (23).

7. The three-position mechanism position signal operating mechanism according to claim 2, characterized in that: The DS auxiliary switch assembly (28) and the ES auxiliary switch assembly (31) are connected to an auxiliary switch mounting plate (33); a crank arm (34) and a switch opening and closing indicator plate 36 (36) are provided at the end of the auxiliary switch mounting plate (33); a mounting nut (39) is connected to the end of the crank arm (34); a driving pin (38) is provided at the end of the mounting nut (39); and a shaft sleeve (37) is provided on the driving pin (38); The first transmission assembly comprises a cam (5) and a ball screw pair (6), the cam (5) being transmission-connected to the ball screw pair (6), and a nut being provided on the ball screw pair (6); The DS auxiliary switch drive plate (29) and the ES auxiliary switch drive plate (30) have the same structure and are both π-shaped. Long grooves are provided on the horizontal ends of the DS auxiliary switch drive plate (29) and the ES auxiliary switch drive plate (30), and the nuts are slidably connected to the long grooves. One of the vertical ends of the DS auxiliary switch drive plate (29) and the ES auxiliary switch drive plate (30) is bent and provided with a U-shaped groove, and the U-shaped groove cooperates with the drive pin (38).

8. The three-position mechanism position signal operating mechanism according to claim 7, characterized in that: The nut is located in the elongated slot.

9. The three-position mechanism position signal operating mechanism according to claim 7, characterized in that: The long groove consists of a first section of the long groove, a second section of the long groove and a third section of the long groove. The first section of the long groove and the third section of the long groove are both inclined, and the second section of the long groove is horizontal.

10. An isolating grounding switch, comprising a switch body, characterized in that: The switch body is equipped with a three-position mechanism position signal operating mechanism as described in any one of claims 1 to 9.

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