A five-proof interlocking structure for ring main units

Abstract

A five-proof interlocking structure for a ring main unit includes a three-position switch assembly, an interlocking mechanism, and a cable compartment door. 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 first interlocking plate abuts against an unlocking operation plate, the second interlocking plate abuts against the first main shaft of the switch, one end of the transmission block abuts against the second interlocking plate, and the other end abuts against the third interlocking plate. The third interlocking plate passes through the base and is inserted into the cable compartment door. One end of the fourth interlocking plate abuts against a second main shaft of the switch, and the other end abuts against the closing button. This invention's interlocking mechanism adopts a multi-plate independent sliding structure. Each interlocking plate is connected to the base via elastic elements. In case of failure, only the corresponding module needs to be replaced, without overall disassembly. Furthermore, the three-dimensional layered layout of the base ensures that maintenance paths do not interfere with each other, avoiding operational limitations caused by confined space, significantly improving maintenance efficiency, and reducing reliance on the skills of maintenance personnel.

Description

Technical Field

[0001] This invention relates to the field of electrical system equipment manufacturing technology, and in particular to a five-proof interlocking structure for a ring main unit. Background Technology

[0002] In modern power systems, ring main units (RNBs) are widely used in urban power grids, industrial parks, and commercial buildings, undertaking important tasks such as power distribution. Their five-proof interlocking structure is crucial for operational safety and reliability. However, most current RNBs have significant problems with their interlocking structures.

[0003] First, the modularity is low and the design is fixed. Components are tightly connected and lack independence; if one component fails, the entire interlocking system must be disassembled for repair. For example, if a small transmission component fails, its complex mechanical connections with surrounding components make disassembling those components time-consuming and prone to errors. Furthermore, the fixed design results in a complex and compact internal structure with limited space between components, restricting maintenance operations. For critical components located deep within the structure, repairs require specialized tools and complex techniques, increasing maintenance costs and difficulty, extending equipment downtime, affecting power supply continuity, and demanding high skill levels from maintenance personnel.

[0004] Secondly, the response speed is slow. The interlocking function requires multiple cumbersome mechanical transmission links, increasing structural complexity and causing operational response delays. For example, in the operation of circuit breaker opening and closing, multiple transmission components act sequentially, which prolongs the response time, easily leading to operator errors and threatening equipment and personal safety.

[0005] Therefore, new solutions are urgently needed to address these issues and improve the safety and reliability of ring main unit operation. Summary of the Invention

[0006] The purpose of this invention is to provide a five-proof interlocking structure for ring main units to solve the problems of low modularity and slow response speed in the existing ring main unit interlocking structures.

[0007] To achieve the above objectives, the present invention provides a five-proof interlocking structure for a ring main unit, including a three-position switch assembly, an interlocking mechanism, and a cable compartment door panel. The interlocking mechanism is located between the three-position switch assembly and the cable compartment door panel, and is connected to both the three-position switch assembly and the cable compartment door panel. The three-position switch assembly includes an unlocking operation panel, a first switch spindle, a second switch spindle, 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 by bolts, and the first, second, and third interlocking plates are slidably connected to the base by elastic elements.

[0009] The first interlocking plate has a locking part that abuts against the locking block on the unlocking operation plate. The second interlocking plate has a pressure bearing part that abuts against the first cam rotating block 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 plate, and the other end abuts against the third interlocking plate. The third interlocking plate has an insertion part that passes through the base and is inserted into the cable compartment door panel. One end of the fourth connecting plate abuts against the second cam rotating block on the second main shaft of the switch and is slidably connected to the three-position switch assembly through an elastic element. The other end abuts against the closing button.

[0010] The transmission 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 plate, and the other end is rotatably connected to the base. One end of the second crank arm is connected to the first crank arm, and the other end abuts against the end of the third interlocking 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. A first interlocking plate is slidably connected to the first mounting surface, a second interlocking plate is slidably connected to the second mounting surface, a transmission block is rotatably connected to the second mounting surface, and a third interlocking plate is slidably connected to the third mounting surface with an interlocking portion passing through the third mounting surface.

[0012] Preferably, the first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate are respectively provided with sliding grooves, and the base and the three-position switch assembly are respectively provided with sliding connecting columns corresponding to the sliding grooves. A sliding wheel that abuts against the sliding groove is provided in the sliding groove, and the sliding wheel is fixed to the sliding connecting column by bolts.

[0013] Preferably, the edge of the sliding groove facing the base has a flange.

[0014] The pulley includes a connecting bearing and a silicone sleeve fitted outside the connecting bearing. The silicone sleeve has a V-shaped groove on its outside, which abuts against the flange.

[0015] Preferably, the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate are all provided with lubrication grooves and extension grooves. The lubrication grooves are arranged radially along their sliding direction, and the extension grooves are distributed on both sides of the lubrication grooves and are non-perpendicularly connected to the lubrication grooves.

[0016] Preferably, the extension grooves are wavy, and the ratio of the number of extension grooves N to the length L of the lubrication groove is as follows: ,in k =[40,60] .

[0017] Preferably, the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate are each provided with a compensation and adjustment assembly, and the compensation and adjustment assembly is respectively connected to the elastic element.

[0018] The compensation adjustment assembly includes a drive device, a moving block, and an adjusting rod. The drive device is fixed to the first interlocking plate, the second interlocking plate, the third interlocking plate, and the fourth interlocking plate, respectively. The output end of the drive 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 engaged with the fixed rod, and the other end is fastened to the elastic element.

[0019] Preferably, the compensation adjustment assembly further includes a detection device, which is respectively disposed at the start and end points of the sliding of the first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate.

[0020] Preferably, one end of the first crank arm has a first flange that abuts against the second interlocking plate, and the other end has a connecting area. One side of the connecting area is rotatably connected to the base, and the connecting area has adjusting grooves.

[0021] The second crank arm has a second flange at one end that abuts against the third interlocking plate, and the other end is rotatably connected to the other side of the connecting area.

[0022] The adjusting component is elliptical and has an adjusting groove on one side that corresponds to the adjusting ridge. The adjusting component is located between the first crank arm and the second crank arm and is rotatably connected to the connecting area. The adjusting groove and the adjusting ridge engage.

[0023] The beneficial effects of this invention are:

[0024] 1. The interlocking mechanism of this invention adopts a multi-plate independent sliding structure. Each interlocking plate is connected to the base through elastic elements. In case of failure, only the corresponding module needs to be replaced, without the need for overall disassembly. Furthermore, the three-dimensional layered layout of the base ensures that maintenance paths do not interfere with each other, avoiding operational limitations caused by confined spaces, significantly improving maintenance efficiency, and reducing reliance on the skills of maintenance personnel.

[0025] 2. This invention achieves five protection functions through mechanical hard interlocking: when the door is opened, the interlock plate quickly rebounds and locks the opening and closing operations; maintenance is only permitted after grounding; and the closing button is forcibly restricted if the operation sequence is incorrect. Simultaneously, the compensation and adjustment component monitors the state of the elastic element in real time, automatically compensating for preload when the spring force decays, and working with sensors to track the interlock plate position in real time to prevent safety accidents caused by mechanical failure.

[0026] 3. This invention employs a "sliding groove + sliding wheel" rolling friction structure to replace traditional planar sliding, reducing the coefficient of friction and improving the interlocking plate's response time. The transmission block optimizes the transmission path through a multi-arm lever principle and an adjustable elliptical adjustment component, allowing for fine-tuning of the lever arm length according to different switching torque requirements. The interlocking plate surface is designed with radial lubrication grooves and wavy extension grooves. By optimizing the ratio of lubrication groove length to extension groove number, the lubricating grease retention area is increased. Furthermore, the sliding wheel uses a silicone sleeve for elastic buffering and a V-groove automatic centering structure to reduce component wear and decrease maintenance frequency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

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

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

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

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

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

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

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

[0035] Figure 8 yes Figure 2 Enlarged view of point A in the middle.

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

[0037] In the diagram: 1. Three-position switch assembly; 11. Unlocking operation panel; 111. Locking block; 12. First main spindle of the switch; 121. First cam rotating block; 13. Second main spindle of the switch; 131. Second cam rotating block; 14. Closing button; 2. Interlocking mechanism; 20. Base; 201. First mounting surface; 202. Second mounting surface; 203. Third mounting surface; 21. First interlocking plate; 211. Locking part; 22. Second interlocking plate; 221. Third interlocking plate; 23. Insertion part; 231. Elastic element; 24. Transmission block; 25. First crank arm. 251; First flange 2511; Connecting area 2512; Adjusting groove 2513; Second crank arm 252; Second flange 2521; Adjusting component 253; Fourth interlocking plate 26; Sliding groove 27; Flanged edge 271; Sliding connecting column 272; Lubrication groove 273; Extension groove 274; Sliding wheel 28; Connecting bearing 281; Silicone sleeve 282; V-groove 283; Compensation and adjustment assembly 29; Drive device 291; Moving block 292; Adjusting rod 293; Detection device 294; Cable compartment door panel 3. Detailed Implementation

[0038] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0039] The five-proof interlocking structure for ring main units provided by this invention mainly consists of a three-position switch assembly 1, an interlocking mechanism 2, and a cable compartment door panel 3. In traditional ring main units, the interlocking structure is mostly a fixed design, with each component tightly connected. When a component fails, the entire interlocking system needs to be disassembled for repair, which is not only time-consuming and labor-intensive but also leads to prolonged equipment downtime, affecting the continuity of power supply. At the same time, the complex transmission links result in slow operation response and increase the risk of misoperation. This invention effectively solves the above problems through a series of innovative designs.

[0040] like Figures 1-2 As shown, a five-proof interlocking structure for a ring main unit includes a modular structure comprising a base 20, multiple interlocking plates, and a transmission block 25. The base 20 is fixedly connected to the ring main unit by 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 slidably connected to the base 20 via elastic elements 24. The elastic force provided by the elastic elements 24 enables the interlocking plates to be movable, and each interlocking plate is independently set. When a certain interlocking plate fails, such as the first interlocking plate 21 due to wear from long-term use, only the corresponding elastic element 24 and connecting parts need to be disassembled to replace the interlocking plate. Unlike traditional structures, it does not require overall disassembly, solving the problem of low modularity and the need for overall disassembly for maintenance in traditional fixed structures, thus significantly improving maintenance efficiency.

[0041] Specifically, such as Figure 3As shown, the first interlocking plate 21 has a locking part 211 that abuts against the locking block 111 on the unlocking operation plate 11. When the cable compartment door is closed, the door pressure causes the first interlocking plate 21 to move downward, separating the locking part 211 from the locking block 111, allowing the unlocking operation plate 11 to operate normally. When the door is opened, the restoring force of the elastic element 24 causes the first interlocking plate 21 to quickly rebound, locking the locking part 211 into the locking block 111. The first interlocking structure forms a chain reaction of "door opening - interlocking plate rebound - limiting unlocking operation", thereby achieving the five-proof function of "prohibiting opening and closing the circuit breaker when the door is open", effectively avoiding the danger of accidentally entering a live compartment.

[0042] like Figure 4 As shown, the second interlocking plate 22 has a pressure-bearing part 221, which abuts against the first cam rotating block 121 mounted on the first main shaft 12 of the switch. The transmission block 25 is rotatably connected to the base 20, with one end abutting against the second interlocking plate 22 and the other end abutting against the third interlocking plate 23. The third interlocking plate 23 has an insertion part 231 that is inserted into the cable compartment door panel. When the first main shaft 12 of the switch rotates, it drives the first cam rotating block 121 fixed thereon to rotate, thereby pushing the second interlocking plate 22. Through the lever transmission action of the transmission block 25, the third interlocking plate 23 is moved. Only when the three-position switch is in the grounded position, and the first cam rotating block 121 pushes the second interlocking plate 22 to disengage the insertion part 231 from the door panel, can the door panel be opened. This process ensures that "the door can only be opened for maintenance after grounding," preventing accidents during live maintenance.

[0043] like Figure 5 As shown, one end of the fourth interlocking plate 26 abuts against the second cam rotating block 131 located on the second main shaft 13 of the switch and is slidably connected to the three-position switch assembly via the elastic element 24. The other end abuts against the closing button 14. During power supply operation, if the three-position switch is not in the working position, the second cam rotating block 131 presses against the fourth interlocking plate 26, causing it to move upward and compress the elastic element 24 (the elastic element 24 in this application is a compression spring), thereby pressing against the closing button 14 (the closing button 14 is connected to a locking plate), that is, the fourth interlocking plate 26 abuts against the locking plate, thereby preventing it from being pressed. During power outage operation, if the circuit breaker is not disconnected first, the action of the closing button 14 is also restricted, realizing the function of forcibly verifying the operation sequence and avoiding accidents caused by incorrect operation sequence.

[0044] And such 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 through the adjusting member 253, the transmission path length and lever arm ratio can be changed. Shortening the transmission path can reduce energy loss and time delay in the transmission links. Compared with traditional multi-stage transmission, the response speed is improved, and the transmission gap can also be adjusted to improve the interlocking accuracy.

[0045] Furthermore, such as Figure 2 As 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 its corresponding mounting surface. The three-dimensional layered structure of this application allows the movement of each interlocking plate to be spatially independent. 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 particular interlocking plate, there is no need to move other interlocking plates. Compared to the traditional structure where the internal space is compact and components obstruct each other, the maintenance operation space is freed up, shortening the maintenance time for individual components and avoiding the risk of accidental contact due to limited space.

[0046] For further details, please refer to [link / reference]. Figure 2 , Figure 6The first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23, and the fourth interlocking plate 26 are each provided with a sliding groove 27. The base 20 and the three-position switch assembly 1 are each provided with a sliding connecting post 272 corresponding to the sliding groove 27. A sliding wheel 28 is provided in the sliding groove 27 to abut against the sliding groove 27. The "sliding groove + sliding wheel" structure transforms the traditional planar sliding friction into rolling friction, making the interlocking plate move more smoothly. Under the same driving force, the motion acceleration is increased and the response time is faster. At the same time, the edge of the sliding groove 27 facing the base 20 is provided with a flange 271. The sliding wheel 28 includes a connecting bearing 281 and a silicone sleeve 282 sleeved on the outside of the connecting bearing 281. The silicone sleeve 282 is provided with a V-shaped groove 283 on the outside, and the V-shaped groove 283 abuts against the flange 271. The V-shaped groove 283 on the outside of the silicone sleeve 282 abuts against the flange 271 on the edge of the sliding groove 27, forming a mechanical limit and an automatic centering mechanism. This limits the lateral displacement of the sliding wheel 28, prevents the interlocking plate from shifting and jamming, and solves the problems of slow response and rapid wear in traditional mechanical transmissions. Furthermore, the elastic deformation capability of the silicone sleeve 282 allows it to absorb energy through deformation when subjected to instantaneous impact loads, such as the impact force generated by the opening and closing of a switch or the vibration force during the sliding of the interlocking plate. This reduces rigid collisions between components, decreases wear between components, and extends the life of the sliding wheel 28. At the same time, this elastic fit reduces the precision requirements during the production of the interlocking plate, which helps to reduce production costs.

[0047] In addition, such as Figure 7 As shown, the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23, and the fourth interlocking plate 26 of this application are respectively provided with a lubrication groove 273 and an extension groove 274 on the side facing the base 20 or the three-position switch assembly 1. The lubrication groove 273 is arranged radially along its sliding direction, and the extension groove 274 is distributed on both sides of the lubrication groove 273 and is non-perpendicularly connected to the lubrication groove 273. The lubrication groove 273 is arranged radially along the sliding direction and can store and release grease or lubricating oil. During the sliding process of the interlocking plate, due to the pressure generated by friction and the direction of movement, the grease can be evenly released to the friction surface, further reducing the coefficient of friction. The non-perpendicular connection design of the extension groove 274 makes it easier for the grease to diffuse into the extension groove, while the wave-shaped design increases the grease retention area, slows down the grease loss rate, solves the problem of frequent maintenance and lubrication of traditional sliding structures, and reduces the risk of jamming due to lack of oil. The flange 271 on the edge of the sliding groove 27, which faces the base 20, is on the same side as the lubrication groove 273 and the extension groove 274, which can effectively prevent grease from leaking from the sliding groove 27 and further improve the lubrication effect.

[0048] Specifically, the ratio of the number N of the extension grooves 274 to the length L of the lubrication grooves 273 is as follows: ,in k =[40,60] Through mathematical modeling and experimental verification, this proportional relationship ensures that the grease is evenly and continuously distributed on the friction surface during the sliding of the interlocking plate, forming a complete oil film according to the plate's length and motion characteristics. An improper ratio may result in localized lubrication blind spots, leading to uneven wear of components. This optimized ratio ensures comprehensive and effective lubrication, and can be flexibly adapted to different lubrication requirements by adjusting the length of the lubrication groove 273 and the number of extension grooves 274, making this structure suitable for ring main units under different operating conditions and frequencies of use.

[0049] Furthermore, such as Figure 8 As shown, the first interlocking plate 21, the second interlocking plate 22, the third interlocking plate 23, and the fourth interlocking plate 26 are each equipped with a compensation adjustment assembly 29, which is connected to the elastic element 24. The compensation adjustment assembly 29 includes a drive device 291, a moving block 292, and an adjusting rod 293. When the elastic element 24 experiences fatigue due to long-term use, resulting in reduced elasticity (e.g., the spring elongation exceeds 5% of its initial value), the drive device 291 detects the relevant signal and controls the movement of the moving block 292, thereby driving the adjusting rod 293 to change the preload of the elastic element 24. This process does not require disassembly of the components; elasticity compensation is achieved through internal mechanical transmission and control, preventing interlocking failure due to spring failure.

[0050] Furthermore, the compensation adjustment assembly 29 also includes a detection device 294 (see...) Figure 2 The detection devices 294 are respectively installed 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. Based on the sensor detection principle, the detection devices 294, such as proximity switches and travel sensors, can monitor the position of the interlocking plates in real time. When the interlocking plates fail to move according to the preset travel, such as jamming or breakage of the elastic element 24, the detection devices 294 trigger an alarm in a very short time, providing timely feedback information in the early stages of the fault to prevent safety accidents caused by mechanical failure. Simultaneously, the detection devices 294 provide precise adjustment basis for the drive device 291, ensuring the accuracy of the preload adjustment of the elastic element 24, and providing data support for fault location. Maintenance personnel can quickly determine the fault location and cause based on the detection data. For example, if the interlocking plate takes too long to reach its position, it is judged as jamming; if the interlocking plate leaves the starting point but fails to reach the ending point for a long time, it is judged as breakage of the elastic element 24, etc.

[0051] In addition, such as Figure 9As shown, the first crank arm 251 of this application has a first flange 2511 at one end that abuts against the second interlocking plate 22, and a connecting area 2512 at the other end. One side of the connecting area 2512 is rotatably connected to the base 20, and the connecting area 2512 is provided with an adjusting ridge 2513. The second crank arm 252 has a second flange 2521 at one end that abuts against the third interlocking plate 23, and the other end is rotatably connected to the other side of the connecting area 2512. The adjusting member 253 is elliptical and has an adjusting groove on one side that corresponds to the adjusting ridge 2513. The adjusting member 253 is located between the first crank arm 251 and the second crank arm 252 and is rotatably connected to the connecting area 2512. The adjusting groove and the adjusting ridge 2513 are engaged. The first flange 2511 and the second flange 2521 of this invention increase the contact area with the interlocking plate. This increased contact area reduces contact stress, thereby reducing localized wear and preventing transmission failure due to excessive localized wear. The elliptical shape of the adjusting member 253 cooperates with the adjusting groove 2513. By rotating the adjusting member 253, its contact position with the first crank arm 251 and the second crank arm 252 is changed, thus fine-tuning the lever arm length of the transmission rod. This adjustment of the lever arm length can adapt to the interlocking force requirements under different working conditions, such as the difference in operating torque between different switch specifications, improving the versatility and applicability of the structure.

[0052] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A five-prevention interlocking structure of a ring main unit, comprising a three-position switch assembly, an interlocking mechanism and a cable chamber door plate, the interlocking mechanism being between the three-position switch assembly and the cable chamber door plate and connected with the three-position switch assembly and the cable chamber door plate respectively, the three-position switch assembly comprising an unlocking operation plate, a switch first main shaft, a switch second main shaft and a closing button, characterized in that 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 base being fixedly connected with the ring main unit by bolts, the first interlocking plate, the second interlocking plate and the third interlocking plate being slidably connected with the base by elastic members respectively, the first interlocking plate being provided with a clamping portion abutting against a clamping block provided on the unlocking operation plate, the second interlocking plate being provided with a pressure receiving portion abutting against a first cam block provided on the switch first main shaft, the transmission block being rotatably connected with the base, one end of the transmission block abutting against the second interlocking plate and the other end abutting against the third interlocking plate, the third interlocking plate being provided with a penetrating portion penetrating through the base and inserted into the cable chamber door plate, one end of the fourth interlocking plate abutting against a second cam block provided on the switch second main shaft and slidably connected with the three-position switch assembly by an elastic member, and the other end abutting against the closing button. The transmission block comprises a first crank arm, a second crank arm and an adjusting member, one end of the first crank arm abutting against the second interlocking plate and the other end being rotatably connected with the base, one end of the second crank arm being connected with the first crank arm and the other end abutting against one end of the third interlocking plate away from the penetrating portion, and the adjusting member abutting against the first crank arm and the second crank arm respectively. The base comprises 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 plate being slidably connected with the first mounting surface, the second interlocking plate being slidably connected with the second mounting surface, the transmission block being rotatably connected with the second mounting surface and the third interlocking plate being slidably connected with the third mounting surface and the penetrating portion penetrating through the third mounting surface. The first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate 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, and sliding wheels abutting against the sliding grooves are arranged in the sliding grooves and fixed to the sliding connection columns by bolts.

2. The five-prevention interlocking structure of the ring main unit according to claim 1, wherein An edge of the sliding groove is provided with a turned edge facing the base.

3. The five-prevention interlocking structure of a ring main unit according to claim 2, characterized in that, The sliding wheel comprises a connecting bearing and a silica gel sleeve sleeved outside the connecting bearing, a V-shaped groove is arranged outside the silica gel sleeve, and the V-shaped groove abuts against the turned edge.

4. The ring main unit five-prevention interlocking structure of claim 3, wherein, The first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate are respectively provided with lubricating grooves and extension grooves, the lubricating grooves being radially arranged along the sliding direction, and the extension grooves being distributed on both sides of the lubricating grooves and being non-perpendicularly communicated with the lubricating grooves. The first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate are respectively provided with compensation adjusting assemblies connected with the elastic members respectively.

5. The ring main unit five-prevention interlocking structure of claim 4, wherein the first and second interlocking mechanisms are connected to each other by a connecting rod. ​ 6. The ring main unit five-prevention interlocking structure of claim 5, wherein, The extension grooves are wavy, and the number N of the extension grooves is in a proportional relationship with the length L of the lubricating groove as follows: wherein .

7. The ring main unit five-prevention interlocking structure of claim 1, wherein, ​ The compensation adjusting assembly comprises driving devices, moving blocks and an adjusting rod, the driving devices are fixed on the first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate respectively, the output ends of the driving devices are fixedly connected with the adjusting rod, the moving blocks pass 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 meshingly connected with the fixed rod, and the other end is buckled with the elastic member.

8. The ring main unit five-prevention interlocking structure of claim 7, wherein, The compensation adjusting assembly further comprises detection devices which are arranged at the start and end points of the sliding of the first interlocking plate, the second interlocking plate, the third interlocking plate and the fourth interlocking plate.

9. The ring main unit five-prevention interlocking structure of claim 1, wherein, One end of the first crank arm is provided with a first flange abutting against the second interlocking plate, and the other end is provided with a connecting area, one side of the connecting area is rotatably connected with the base, and the connecting area is provided with an adjusting convex ridge, One end of the second crank arm is provided with a second flange abutting against the third interlocking plate, and the other end is rotatably connected with the other side of the connecting area, The adjusting member is in an elliptical shape and is provided with an adjusting groove corresponding to the adjusting convex ridge on one side, the adjusting member is located between the first crank arm and the second crank arm and is rotatably connected with the connecting area, and the adjusting groove is engaged with the adjusting convex ridge.

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