Five-prevention interlocking structure of ring main unit

Abstract

A five-prevention interlocking structure of a ring main unit comprises a three-position switch assembly, an interlocking mechanism and a cable chamber door plate, the interlocking mechanism comprises a base, a first interlocking plate, a second interlocking plate, a transmission block, a third interlocking plate and a fourth interlocking plate, the first interlocking plate abuts against an unlocking operation plate, the second interlocking plate abuts against a first main shaft of a switch, and the third interlocking plate abuts against a second main shaft of the switch. One end of the transmission block abuts against the second interlocking plate, the other end of the transmission block abuts against the third interlocking plate, the third interlocking plate penetrates through the base and is inserted into the cable chamber door plate, one end of the fourth connecting plate abuts against the second main shaft of the switch, and the other end of the fourth connecting plate abuts against the closing button. According to the interlocking mechanism, a multi-plate independent sliding structure is adopted, each interlocking plate is connected with the base through the elastic piece, only corresponding modules need to be replaced in case of faults, and overall disassembly is not needed. And in cooperation with the three-dimensional layered layout of the base, maintenance paths do not interfere with one another, operation limitation caused by narrow space is avoided, the maintenance efficiency is remarkably improved, and meanwhile, the skill dependence on maintenance personnel is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical system equipment production, and particularly to a five-prevention interlocking structure for a ring main unit. Background Art

[0002] In modern power systems, ring main units are widely used in urban power grids, industrial parks, commercial buildings, etc., undertaking important tasks such as power distribution. Their five-prevention interlocking structure is crucial for safe and reliable operation. However, most current interlocking structures of ring main units have significant problems.

[0003] Firstly, the modularity is low and it is a fixed design. Components are closely connected with poor independence. When a certain component fails, the entire interlocking system needs to be disassembled for repair. For example, when a small transmission component is damaged, due to its complex mechanical connection with surrounding components, it takes a long time to remove the surrounding components, and it is easy to make mistakes during assembly. At the same time, the fixed design makes the internal structure complex and compact, with a narrow space between components, restricting the maintenance operation space. For key components deep inside, special tools and complex postures are required for maintenance, which not only increases the maintenance cost and the difficulty of overhaul, prolongs the equipment downtime, affects the power supply continuity, but also requires high skills for maintenance personnel.

[0004] Secondly, the response speed is slow. The realization of the interlocking function requires multiple cumbersome mechanical transmission links, increasing the structural complexity and resulting in a delay in operation response. For example, during the opening and closing operations of a circuit breaker, the sequential movement of multiple transmission components makes the response time longer, easily causing misoperations by operators and threatening the safety of equipment and personnel.

[0005] Therefore, there is an urgent need for a new solution to solve these problems and improve the operation safety and reliability of ring main units. Summary of the Invention

[0006] The purpose of the present invention is to provide a five-prevention interlocking structure for a ring main unit to solve the problems of low modularity and slow response speed of the interlocking structure of the ring main unit in the prior art.

[0007] To achieve the above purpose, the present invention provides a five-prevention interlocking structure for a ring main unit, including a three-position switch assembly, an interlocking mechanism, and a cable chamber door panel. The interlocking mechanism is located between the three-position switch assembly and the cable chamber door panel, and the interlocking mechanism is respectively connected to the three-position switch assembly and the cable chamber door panel. The three-position switch assembly includes an unlocking operation board, a first main shaft of the switch, a second main shaft of the switch, and a closing button.

[0008] The interlocking mechanism includes a base, a first interlocking plate, a second interlocking plate, a transmission block, a third interlocking plate, and a fourth interlocking plate. The base is fixedly connected to the ring main unit through bolts. The first interlocking plate, the second interlocking plate, and the third interlocking plate are respectively slidably connected to the base through elastic members.

[0009] The first interlock plate is provided with a clamping part, which abuts against a clamping block arranged on the unlocking operation plate. The second interlock plate is provided with a bearing part, which abuts and connects with a first cam rotating block arranged on the first main shaft of the switch. The transmission block is rotatably connected to the base. One end of the transmission block abuts against the second interlock plate, and the other end abuts against the third interlock plate. The third interlock plate is provided with an insertion part, which passes through the base and is inserted into the cable chamber door panel. One end of the fourth connecting plate abuts against a second cam rotating block arranged on the second main shaft of the switch and is slidably connected to the three-position switch assembly through an elastic member, and the other end abuts against the closing button;

[0010] The rotating block includes a first crank arm, a second crank arm and an adjusting member. One end of the first crank arm abuts against the second interlock plate, and the other end is rotatably connected to the base. One end of the second crank arm is connected to the second crank arm, and the other end abuts against one end of the third interlock plate away from the insertion part. The adjusting member abuts against the first crank arm and the second crank arm respectively.

[0011] Preferably, the base includes a first mounting surface, a second mounting surface perpendicular to the first mounting surface, and a third mounting surface below the second mounting surface. The first interlock plate is slidably connected to the first mounting surface, the second interlock plate is slidably connected to the second mounting surface, the transmission block is rotatably connected to the second mounting surface, and the third interlock plate is slidably connected to the third mounting surface and the insertion part passes through the third mounting surface.

[0012] Preferably, the first interlock plate, the second interlock plate, the third interlock plate and the fourth interlock plate are respectively provided with sliding grooves, and the base and the three-position switch assembly are respectively provided with sliding connection columns corresponding to the sliding grooves. Sliding wheels abuting against the sliding grooves are arranged in the sliding grooves, and the sliding wheels are fixed to the sliding connection columns by bolts.

[0013] Preferably, a flanging is provided on the side of the edge of the sliding groove facing the base.

[0014] The sliding wheel includes a connecting bearing and a silica gel sleeve sleeved outside the connecting bearing. A V-shaped groove is provided on the outside of the silica gel sleeve, and the V-shaped groove abuts against the flanging.

[0015] Preferably, the first interlock plate, the second interlock plate, the third interlock plate and the fourth interlock plate are respectively provided with lubricating grooves and extension grooves. The lubricating grooves are radially arranged along their sliding directions, and the extension grooves are distributed on both sides of the lubricating grooves and are non-perpendicularly communicated with the lubricating grooves.

[0016] Preferably, the extension groove is in a wavy shape, and the proportional relationship between the number N of the extension grooves and the length L of the lubricating groove is: , where k =[40,60] .

[0017] Preferably, the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate are respectively provided with compensation adjustment components, and the supplementary adjustment components are respectively connected to the elastic members.

[0018] The compensation adjustment component includes a driving device, a moving block, and an adjustment rod. The driving devices are respectively fixed on the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate. The output end of the driving device is fixedly connected to the adjustment rod. The moving blocks respectively pass through the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate. One end of the moving block is meshed with the fixed rod, and the other end is buckled with the elastic member.

[0019] Preferably, the compensation adjustment component further includes a detection device, and the detection devices are respectively arranged at the starting and ending points where the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate slide.

[0020] Preferably, one end of the first crank arm is provided with a first flange that abuts against the second interlocking plate, and the other end is provided with a connection area. One side of the connection area is rotatably connected to the base, and the connection area is provided with adjustment ribs.

[0021] One end of the second crank arm is provided with a second flange that abuts against the third interlocking plate, and the other end is rotatably connected to the other side of the connection area.

[0022] The adjusting member is elliptical and one side is provided with an adjusting groove corresponding to the adjusting ribs. The adjusting member is located between the first crank arm and the second crank arm and is rotatably connected to the connection area. The adjusting groove engages with the adjusting ribs.

[0023] Advantages of the present invention:

[0024] 1. The interlocking mechanism of the present invention adopts a multi-plate independent sliding structure. Each interlocking plate is connected to the base through an elastic member. In case of a failure, only the corresponding module needs to be replaced without overall disassembly. And in combination with the three-dimensional hierarchical layout of the base, the maintenance paths do not interfere with each other, avoiding operation limitations caused by narrow space, significantly improving the maintenance efficiency, and at the same time reducing the skill dependence on maintenance personnel.

[0025] 2. The present invention realizes the five-prevention function through mechanical hard interlocking: when opening the door, the interlocking plate quickly rebounds to lock the opening and closing operations. It is only allowed to open the door for maintenance after grounding. When the operation sequence is incorrect, the closing button is forcibly restricted. At the same time, the compensation adjustment component monitors the state of the elastic member in real time. When the spring force decays, the pre-tightening force is automatically compensated. In combination with the sensor, the position of the interlocking plate is tracked in real time to prevent safety accidents caused by mechanical failure.

[0026] 3. The present invention adopts a rolling friction structure of "sliding groove + sliding wheel" to replace the traditional planar sliding, reducing the friction coefficient and improving the action response time of the interlocking plate. The transmission block and the adjustable elliptical adjusting part are based on the principle of multi-crank lever to optimize the transmission path, and the force arm length can be finely adjusted according to different switch torque requirements. The surface of the interlocking plate is designed with radial lubricating grooves and wavy extension grooves. By optimizing the ratio of the length of the lubricating grooves to the number of extension grooves, the retention area of lubricating grease is increased. Moreover, the sliding wheel adopts a silica gel sleeve elastic buffer and a V-groove automatic centering structure, reducing the wear amount of components and the maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art.

[0028] Figure 1 It is a schematic diagram of the overall structure of the ring main unit of the present invention.

[0029] Figure 2 It is a schematic diagram of the structure of the interlocking mechanism of the present invention.

[0030] Figure 3 It is a schematic diagram of the connection between the first interlocking plate and the unlocking operation plate of the present invention.

[0031] Figure 4 It is a schematic diagram of the connection between the second interlocking plate and the third interlocking plate of the present invention.

[0032] Figure 5 It is a schematic diagram of the connection between the fourth interlocking plate and the closing button of the present invention.

[0033] Figure 6 It is a simplified connection diagram of the sliding wheel and the sliding groove of the present invention.

[0034] Figure 7 It is a schematic diagram of the structure of the lubricating groove and the extension groove on the first interlocking plate of the present invention.

[0035] Figure 8 It is Figure 2 The enlarged view at A in

[0036] Figure 9 It is an exploded view of the connection between the transmission block and the second interlocking plate and the third interlocking plate of the present invention.

[0037] In the figure: three-position switch assembly 1; unlocking operation board 11; clamping block 111; first main shaft 12 of the switch; first cam rotating block 121; second main shaft 13 of the switch; second cam rotating block 131; closing button 14; interlocking mechanism 2; base 20; first mounting surface 201; second mounting surface 202; third mounting surface 203; first interlocking plate 21; clamping position 211; second interlocking plate 22; bearing part 221; third interlocking plate 23; inserting part 231; elastic part 24; transmission block 25; first crank arm 251; first flange 2511; connection area 2512; adjusting rib 2513; second crank arm 252; second flange 2521; adjusting part 253; fourth interlocking plate 26; sliding groove 27; flanging 271; sliding connection column 272; lubricating groove 273; extending groove 274; sliding wheel 28; connecting bearing 281; silica gel sleeve 282; V-shaped groove 283; compensation adjusting assembly 29; driving device 291; moving block 292; adjusting rod 293; detecting device 294; cable chamber door panel 3. Specific embodiments

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0039] The five-prevention interlocking structure of the ring main unit provided by the present invention mainly consists of a three-position switch assembly 1, an interlocking mechanism 2, and a cable chamber door panel 3. In traditional ring main units, the interlocking structure is mostly of a fixed design, and each component is closely connected. When a certain component is damaged, the entire interlocking system needs to be disassembled for repair, which not only takes time and effort but also causes the equipment to be shut down for a long time, affecting the power supply continuity. At the same time, the complex transmission links make the operation response slow and increase the risk of misoperation. However, the present invention effectively solves the above problems through a series of innovative designs.

[0040] As Figures 1-2 shown, a five-prevention interlocking structure of a ring main unit includes a modular structure of a base 20, multiple interlocking plates, and a transmission block 25. The base 20 is fixedly connected to the ring main unit through bolts, providing stable support for the entire interlocking mechanism 2. The first interlocking plate 21, the second interlocking plate 22, and the third interlocking plate 23 are respectively slidably connected to the base 20 through elastic parts 24. The elastic force provided by the elastic parts 24 enables the interlocking plates to have mobility, and each interlocking plate is independently arranged. When a certain interlocking plate fails, such as the first interlocking plate 21 being worn due to long-term use, only the corresponding elastic part 24 and the connecting components need to be disassembled to replace the interlocking plate, without the need for overall disassembly like the traditional structure, solving the problems of low modularity of the traditional fixed structure and the need for overall disassembly for maintenance, and greatly improving the maintenance efficiency.

[0041] Specifically, as Figure 3As shown, the first interlock plate 21 is provided with a locking portion 211, which abuts against the block 111 provided on the unlocking operation panel 11. When the door panel of the cable room is closed, the door panel pressure causes the first interlock plate 21 to move downward, the locking portion 211 is separated from the block 111, and the unlocking operation panel 11 can operate normally; when the door panel is opened, the restoring force of the elastic member 24 causes the first interlock plate 21 to rebound quickly, and the locking portion 211 blocks the block 111. The first interlocking structure forms a chain reaction of "opening the door-interlocking plate rebounding-limiting the unlocking operation", thereby realizing the five-prevention function of "prohibiting opening and closing of the switch in the open door state", effectively avoiding the danger of accidentally entering the live interval.

[0042] like Figure 4 As shown, the second interlock plate 22 is provided with a pressure-bearing portion 221, which is abutted against the first cam rotating block 121 provided on the first main shaft 12 of the switch. The transmission block 25 is rotatably connected to the base 20, one end of which is abutted against the second interlock plate 22, and the other end is abutted against the third interlock plate 23. The third interlock plate 23 is provided with an insertion portion 231 inserted in the cable room door panel. When the first main shaft 12 of the switch rotates, the first cam rotating block 121 fixed thereon is driven to rotate, thereby pushing the second interlock plate 22, and through the lever transmission of the transmission block 25, the third interlock plate 23 is driven to move. Only when the three-position switch is in the grounding position, the first cam rotating block 121 pushes the second interlock plate 22 to separate the insertion portion 231 from the door panel, and the door panel can be opened. This process ensures that "the door can be opened for maintenance only after grounding", preventing the occurrence of live maintenance accidents.

[0043] like Figure 5 As shown, one end of the fourth interlock plate 26 abuts against the second cam rotating block 131 provided on the second main shaft 13 of the switch and is slidably connected to the three-position switch assembly through the elastic member 24, and the other end abuts against the closing button 14. During the power supply operation, if the three-position switch is not in the working position, the second cam rotating block 131 abuts against the fourth interlock plate 26, causing it to move upward to compress the elastic member 24 (the elastic member 24 in this application is a compression spring), and then abuts against the closing button 14 (the closing button 14 is connected to a card plate), that is, the fourth interlock plate 26 abuts against the card plate, thereby preventing it from being pressed; during the power failure operation, if the circuit breaker is not disconnected first, the action of the closing button 14 is also restricted, so as to realize the role of forcibly checking the operation sequence and avoid accidents caused by wrong operation sequence.

[0044] And as Figure 2As shown, the transmission block 25 includes a first crank arm 251, a second crank arm 252, and an adjusting member 253. The first crank arm 251 and the second crank arm 252 form a lever transmission structure, and the adjusting member 253 abuts against them. By finely adjusting the angle between the first crank arm 251 and the second crank arm 252 with the adjusting member 253, the length of the transmission path and the force arm ratio can be changed. Shortening the transmission path can reduce the energy loss and time delay of the transmission link. Compared with the traditional multi-stage transmission, the response speed is improved. At the same time, the transmission clearance can be adjusted to improve the interlocking accuracy.

[0045] Further, as Figure 2 shown, the base 20 includes a first mounting surface 201, a second mounting surface 202 perpendicular to the first mounting surface 201, and a third mounting surface 203 below the second mounting surface 202. Each interlocking plate slides on the corresponding mounting surface. The three-dimensional hierarchical structure of the present application makes the movements of the interlocking plates independent of each other in space. The first interlocking plate 21 slides vertically along the first mounting surface 201, the second interlocking plate 22 slides vertically along the second mounting surface 202, and the third interlocking plate 23 slides horizontally along the third mounting surface 203. The installation and disassembly paths of each plate do not interfere with each other. When repairing a certain interlocking plate, there is no need to move other interlocking plates. Compared with the traditional structure where the internal space is compact and the components block each other, the maintenance operation space is released, the maintenance time of a single component is shortened, and at the same time, the risk of accidental touch caused by the narrow space is avoided.

[0046] Still further, referring to Figure 2 、 Figure 6, a sliding groove 27 is respectively provided on the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23 and the fourth interlocking plate 26, and a sliding connection column 272 corresponding to the sliding groove 27 is respectively provided on the base 20 and the three-position switch assembly 1. A sliding wheel 28 abutted against the sliding groove 27 is arranged in the sliding groove 27. The "sliding groove + sliding wheel" structure changes the traditional planar sliding friction into rolling friction, making the action of the interlocking plate smoother. Under the same driving force, the motion acceleration increases and the response time is faster. At the same time, a flanging 271 is provided on one side of the edge of the sliding groove 27 facing the base 20. The sliding wheel 28 includes a connecting bearing 281 and a silica gel sleeve 282 sleeved outside the connecting bearing 281. A V-shaped groove 283 is provided outside the silica gel sleeve 282, and the V-shaped groove 283 abuts against the flanging 271. The V-shaped groove 283 outside the silica gel sleeve 282 abuts against the flanging 271 at the edge of the sliding groove 27, and they cooperate to form a mechanical limit, constituting an automatic centering mechanism, thereby restricting the lateral displacement of the sliding wheel 28 and avoiding the offset and jamming of the interlocking plate, solving the problems of slow response and fast wear of the traditional mechanical transmission. And due to the elastic deformation ability of the silica gel sleeve 282, when subjected to instantaneous impact loads, such as the impact force generated by switch opening and closing, the vibration force during the sliding of the interlocking plate, etc., it can absorb energy through deformation, reduce the rigid collision between components, reduce the wear between components, extend the service life of the sliding wheel 28, and at the same time, this elastic cooperation reduces the requirement for precision during the production of the interlocking plate, which is beneficial to reducing production costs.

[0047] In addition, as Figure 7 shown, lubricating grooves 273 and extension grooves 274 are respectively provided on one side of the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23 and the fourth interlocking plate 26 facing the base 20 or the three-position switch assembly 1. The lubricating grooves 273 are radially arranged along their sliding direction, and the extension grooves 274 are distributed on both sides of the lubricating grooves 273 and are non-vertically communicated with the lubricating grooves 273. The lubricating grooves 273 are radially arranged along the sliding direction, which can store and release grease or lubricating oil. During the sliding process of the interlocking plate, due to the pressure and movement direction generated by friction, the grease can be evenly released to the friction surface, further reducing the friction coefficient; the non-vertical communication design of the extension grooves 274 makes it easier for the grease to spread to the extension grooves, and the wavy design increases the retention area of the grease, delaying the loss speed of the grease, solving the problem of frequent maintenance and oil injection required by the traditional sliding structure, and at the same time reducing the risk of jamming caused by lack of oil. And the flanging 271 at the edge of the sliding groove 27, on its side facing the base 20, is on the same side as the lubricating grooves 273 and the extension grooves 274, which can effectively prevent the grease from leaking from the sliding groove 27 and further improve the lubrication effect.

[0048] Specifically, the proportional relationship between the number N of the extension grooves 274 and the length L of the lubricating grooves 273 is: , where k =[40,60] , through mathematical modeling and experimental verification, this proportional relationship enables the grease to be evenly and continuously distributed on the friction surface according to the length and motion characteristics of the plate during the sliding process of the interlocking plate, forming a complete oil film. If the proportion is improper, local lubrication blind spots may occur, resulting in uneven wear of components. This optimized proportion ensures the comprehensiveness and effectiveness of lubrication, and can flexibly adapt to the number of extension grooves 274 by adjusting the length of the lubrication groove 273 according to different lubrication requirements, making this structure applicable to ring main units under different working conditions and usage frequencies.

[0049] Furthermore, as Figure 8 shown, the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23, and the fourth interlocking plate 26 are respectively provided with compensation adjustment components 29, and the compensation adjustment components 29 are respectively connected to the elastic members 24. The compensation adjustment component 29 includes a driving device 291, a moving block 292, and an adjusting rod 293. When the elastic force of the elastic member 24 decays due to long-term use fatigue, for example, the elongation of the spring exceeds 5% of the initial value, after the driving device 291 detects the relevant signal, it can drive the moving block 292 to move, and then drive the adjusting rod 293 to change the pre-tightening force of the elastic member 24. This process does not require disassembling components, and realizes elastic force compensation through internal mechanical transmission and control, avoiding the malfunction of the interlocking function caused by spring failure.

[0050] Moreover, the compensation adjustment component 29 further includes a detection device 294 (refer to Figure 2 ), and the detection devices 294 are respectively arranged at the starting and ending points of the sliding of the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23, and the fourth interlocking plate 26. According to the sensor detection principle, the detection devices 294 such as proximity switches and travel sensors can monitor the position of the interlocking plate in real time. When the interlocking plate does not act according to the preset stroke, such as jamming, breakage of the elastic member 24, etc., the detection device 294 triggers an alarm in an extremely short time, feedbacks information in the initial stage of the fault, prevents safety accidents caused by mechanical failures, and at the same time the detection device 294 provides accurate adjustment basis for the driving device 291 to ensure the accuracy of the pre-tightening force adjustment of the elastic member 24, and provides data support for fault location. Maintenance personnel can quickly judge the fault location and cause according to the detection data. For example, if the interlocking plate arrives at the position overtime, it is judged as jamming, and if the interlocking plate leaves the starting point but does not reach the ending point for a long time, it is judged as breakage of the elastic member 24, etc.

[0051] In addition, as Figure 9As shown in the figure, one end of the first toggle arm 251 of the present application is provided with a first flange 2511 that abuts against the second interlocking plate 22, and the other end is provided with a connection area 2512. One side of the connection area 2512 is rotatably connected to the base 20, and the connection area 2512 is provided with adjustment ribs 2513; one end of the second toggle arm 252 is provided with a second flange 2521 that abuts against the third interlocking plate 23, and the other end is rotatably connected to the other side of the connection area 2512; the adjusting member 253 is elliptical and one side is provided with an adjustment groove corresponding to the adjustment ribs 2513. The adjusting member 253 is located between the first toggle arm 251 and the second toggle arm 252 and is rotatably connected to the connection area 2512, and the adjustment groove engages with the adjustment ribs 2513. The first flange 2511 and the second flange 2521 of the present invention increase the contact area with the interlocking plate. The increase in the contact area reduces the contact stress, thereby reducing local wear and avoiding transmission failure caused by local excessive wear; the elliptical shape of the adjusting member 253 cooperates with the adjustment ribs 2513. By rotating the adjusting member 253, the contact positions with the first toggle arm 251 and the second toggle arm 252 are changed, thereby finely adjusting the lever arm length of the transmission rod. The adjustment of the lever arm length can meet the interlocking force requirements under different working conditions, such as the operation torque differences of switches of different specifications, improving the versatility and applicability of the structure.

[0052] The above disclosure is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Those of ordinary skill in the art can understand the whole or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A five-prevention interlocking structure for a ring main unit, comprising a three-position switch assembly, an interlocking mechanism, and a cable chamber door panel. The interlocking mechanism is located between the three-position switch assembly and the cable chamber door panel, and the interlocking mechanism is respectively connected to the three-position switch assembly and the cable chamber door panel. The three-position switch assembly includes an unlocking operation board, a first main shaft of the switch, a second main shaft of the switch, and a closing button, and is characterized in that the interlocking mechanism includes a base, a first interlocking board, a second interlocking board, a transmission block, a third interlocking board, and a fourth interlocking board. The base is fixedly connected to the ring main unit by bolts. The first interlocking board, the second interlocking board, and the third interlocking board are respectively slidably connected to the base through elastic members. The first interlocking board is provided with a clamping portion, and the clamping portion abuts against a clamping block provided on the unlocking operation board. The second interlocking board is provided with a bearing portion, and the bearing portion is in abutting connection with a first cam rotating block provided on the first main shaft of the switch. The transmission block is rotatably connected to the base. One end of the transmission block abuts against the second interlocking board, and the other end abuts against the third interlocking board. The third interlocking board is provided with an inserting portion, and the inserting portion passes through the base and is inserted into the cable chamber door panel. One end of the fourth connecting board abuts against a second cam rotating block provided on the second main shaft of the switch and is slidably connected to the three-position switch assembly through an elastic member, and the other end abuts against the closing button. The rotating block includes a first crank arm, a second crank arm, and an adjusting member. One end of the first crank arm abuts against the second interlocking board, and the other end is rotatably connected to the base. One end of the second crank arm is connected to the second crank arm, and the other end abuts against one end of the third interlocking board away from the inserting portion. The adjusting member abuts against the first crank arm and the second crank arm respectively.

2. The five-prevention interlocking structure of a ring main unit according to claim 1, characterized in that, The base includes a first mounting surface, a second mounting surface perpendicular to the first mounting surface, and a third mounting surface below the second mounting surface. The first interlocking board is slidably connected to the first mounting surface. The second interlocking board is slidably connected to the second mounting surface. The transmission block is rotatably connected to the second mounting surface. The third interlocking board is slidably connected to the third mounting surface and the inserting portion passes through the third mounting surface.

3. The five-prevention interlocking structure of a ring main unit according to claim 2, characterized in that The first interlocking board, the second interlocking board, the third interlocking board, and the fourth interlocking board are respectively provided with sliding grooves. The base and the three-position switch assembly are respectively provided with sliding connection columns corresponding to the sliding grooves. A sliding wheel that abuts against the sliding groove is arranged in the sliding groove, and the sliding wheel is fixed to the sliding connection column by bolts.

4. The five-prevention interlocking structure of a ring main unit according to claim 3, characterized in that, A flanging is provided on one side of the edge of the sliding groove facing the base. The sliding wheel includes a connecting bearing and a silica gel sleeve sleeved outside the connecting bearing. A V-shaped groove is provided on the outside of the silica gel sleeve, and the V-shaped groove abuts against the flanging.

5. The five-prevention interlocking structure of a ring main unit according to claim 4, characterized in that, The first interlocking board, the second interlocking board, the third interlocking board, and the fourth interlocking board are respectively provided with lubricating grooves and extending grooves. The lubricating grooves are radially arranged along their sliding directions. The extending grooves are distributed on both sides of the lubricating grooves and are non-perpendicularly communicated with the lubricating grooves.

6. The five-prevention interlocking structure of a ring main unit according to claim 5, characterized in that, The extension groove is wavy, and the proportional relationship between the number N of the extension grooves and the length L of the lubrication groove is: , where .

7. The five-prevention interlocking structure of a ring main unit according to claim 1, characterized in that, The first interlocking board, the second interlocking board, the third interlocking board, and the fourth interlocking board are respectively provided with compensation adjustment components, and the compensation adjustment components are respectively connected to the elastic members. The supplementary adjustment assembly includes a driving device, a moving block, and an adjusting rod. The driving device is respectively fixed on the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate. The output end of the driving device is fixedly connected to the adjusting rod. The moving block passes through the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate respectively. One end of the moving block is meshed with the fixed rod, and the other end is buckled with the elastic member.

8. The five-prevention interlocking structure of a ring main unit according to claim 7, characterized in that, The supplementary adjustment assembly further includes a detection device, which is respectively arranged at the starting and ending points where the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate slide.

9. The five-prevention interlocking structure of a ring main unit according to claim 1, characterized in that, One end of the first crank arm is provided with a first flange that abuts against the second interlocking plate, and the other end is provided with a connection area. One side of the connection area is rotatably connected to the base, and the connection area is provided with adjusting ridges. One end of the second crank arm is provided with a second flange that abuts against the third interlocking plate, and the other end is rotatably connected to the other side of the connection area. The adjusting member is elliptical and is provided with an adjusting groove corresponding to the adjusting ridges on one side. The adjusting member is located between the first crank arm and the second crank arm and is rotatably connected to the connection area. The adjusting groove engages with the adjusting ridges.

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