An integrated grounding connection device for ring main unit base

Abstract

This invention discloses an integrated grounding connection device for a ring main unit base, relating to the field of grounding connection technology, and particularly suitable for installation spaces such as ring main unit bases. The device includes a connection mechanism comprising a clamping plate assembly that cooperates with a grounding lead plate, the grounding lead plate being used to lead the grounding conductor to the installation space; it also includes a fastening screw, which is rotatably mounted via a bracket and threadedly engages with a movable block in the clamping plate assembly; the clamping plate assembly includes a separate movable block and a clamping block, the clamping block having a clamping groove, the bottom of which is provided with a longitudinally movable conductive plate, used for electrical connection with the grounding wire and pressed against the surface of the grounding lead plate. This grounding connection device, through the separate clamping block and transmission component, allows for multi-faceted composite clamping and disassembly with just the rotation of the screw, solving the problems of existing grounding connection structures being mostly fixed, difficult to disassemble after installation, requiring cutting tools or handling rusted bolts during maintenance, and being time-consuming and labor-intensive.

Description

Technical Field

[0001] This invention relates to the field of grounding connection technology, and in particular to an integrated grounding connection device for a ring main unit base. Background Technology

[0002] As a critical switching device in the power distribution network, the grounding reliability of ring main units (RMS) directly affects the personal safety of maintenance personnel and the stable operation of the power system. According to power safety regulations, RMS units must have a reliable grounding connection to conduct fault currents from the cabinet and internal equipment to the earth, preventing electric shock accidents and equipment damage. Currently, the common grounding method for RMS units involves pre-burying a grounding electrode under the base and connecting the cabinet to the grounding electrode via a grounding lead to ensure a smooth grounding circuit.

[0003] In existing technologies, most ring main unit (RMU) grounding connections adopt a fixed structure, such as permanently fastening the grounding lead to the cabinet base by welding or bolts. Once installed, these connections are difficult to disassemble. For example, the 10kV fully enclosed cable branch box and RMU pile head grounding device in application number 202220467669.1 uses bolt fastening. When the RMU needs to be inspected, replaced, or relocated, operators often need to use cutting tools or repeatedly tighten the corroded bolts, which is not only time-consuming and laborious but may also damage the grounding lead or base structure. In addition, fixed grounding connections lack a flexible disconnection mechanism, making it impossible to quickly achieve grounding isolation in emergencies, causing many inconveniences for on-site operations.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology. How to provide a grounding connection device that is easy to disassemble, install, and maintain efficiently is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated grounding connection device for the base of a ring main unit, which solves the technical problems of existing ring main unit grounding connections mostly adopting a fixed structure, which is difficult to disassemble after installation, requires cutting tools or treatment of rusted bolts during maintenance, is time-consuming and laborious, and is prone to damage to components, and lacks a flexible disconnection mechanism.

[0006] To achieve the above objectives, the present invention provides an integrated grounding connection device for a ring main unit base, including a connection mechanism disposed within the base. The connection mechanism includes a clamping plate assembly that cooperates with a grounding lead plate, and the grounding lead plate is used to lead out from the grounding side conductor to the installation space. It also includes a fastening screw, which is rotatably mounted via a bracket and threadedly engages with a movable block in the clamping plate assembly; The clamping plate assembly includes a separate movable block and a clamping block. The clamping block has a clamping groove, and a conductive plate that can move longitudinally is provided at the bottom of the clamping groove. The conductive plate is used to electrically connect with the grounding wire and press against the surface of the grounding lead plate. The clamping block and the moving block are coupled by a connector, so that the clamping block can be translated along the screw axis and locked longitudinally; A transmission component is also provided between the clamping block and the moving block. When the fastening screw rotates to clamp the clamping block in the lateral position and continues to screw in, the transmission component converts the relative displacement of the moving block into the upward movement of the conductive plate to compact the grounding lead plate.

[0007] Preferably, the installation space is the installation space inside the ring main unit base; The connector includes a square groove on the upper surface of the movable block, a slider fixed below the clamping block, a slide rod fixed in the square groove, a slide sleeve slidably sleeved on the slide rod, and a support spring sleeved on the slide rod; the slider is slidably inserted into the square groove, one end of the support spring abuts against the inner wall of the square groove, and the other end abuts against the end of the slide sleeve, so that the slider is elastically pushed to the initial position near the middle of the screw in the square groove under normal conditions.

[0008] Preferably, the transmission component includes a push rod vertically fixed to the bottom surface of the conductive plate and a wedge groove formed in the bottom wall of the square groove; the push rod passes downward through the clamping block and the slider in sequence, and its bottom end extends into the wedge groove and always abuts against the inclined surface of the wedge groove; the lowest point of the inclined surface of the wedge groove is located on the side near the middle of the screw, and the highest point faces the end of the screw.

[0009] Preferably, the inner walls of the square groove on both sides along the screw axis are symmetrical inclined planes, making the square groove have an isosceles trapezoidal profile, with its narrow end pointing to the middle of the screw and its wide end pointing to the end of the screw.

[0010] Preferably, the slider is provided with an anti-retraction component, which includes a retractable wedge block assembly, a mounting groove, and a one-way control assembly; the wedge block assembly is located in the direction of the slider facing the inclined inner walls on both sides of the square groove, and its exposed end has an inclined surface that matches the inclined surface of the inner side of the square groove; the one-way control assembly is accommodated in the mounting groove and cooperates with the wedge block assembly so that the wedge block assembly can only extend and cannot retract.

[0011] Preferably, the wedge assembly includes a wedge body, a connecting rod, and a top block; the wedge body is located on the outer side of the slider, the connecting rod extends through the side wall of the mounting groove into the mounting groove, and the top block is fixed to the end of the connecting rod and contacts the one-way control assembly.

[0012] Preferably, the unidirectional control group includes a vertically arranged rotating shaft, a ratchet coaxially mounted on the rotating shaft, ratchet teeth inserted radially along the ratchet, and a cam fixed coaxially with the rotating shaft; the ratchet teeth achieve radial elastic extension and contraction through an elastic control element, and engage with the unidirectional teeth of the ratchet, restricting the ratchet to rotate only in one direction; the outer ring of the cam is symmetrically provided with two protrusions, the protrusions having a gradually raised ramp structure, which interact with the top blocks of the wedge block groups on both sides respectively.

[0013] Preferably, a torsion spring is connected between the rotating shaft and the bottom wall of the mounting groove. When the torsion spring is in a naturally released state, the cam is driven to rotate to the position where the highest point of the protrusion contacts the top block, so that the wedge block extends to its maximum length and the total width of its two inclined surfaces matches the internal dimension of the widest end of the square groove.

[0014] Preferably, the elastic control component includes an outer cylinder fixed to the wall of the mounting groove, a sliding column fixedly connected to one end of the ratchet, a rotating column rotatably connected to the sliding column, a threaded column threadedly connected to the outer cylinder, and a telescopic spring disposed between the rotating column and the threaded column; an operating rod is fixed on the rotating column, the operating rod extends out of the cylinder through an elongated guide groove on the outer cylinder, and a limiting groove perpendicularly intersecting the end of the guide groove is provided.

[0015] Preferably, a clearance hole is provided on the wall of the square groove. When the slider moves to the widest end and locks, the outer cylinder passes through the clearance hole, exposing the threaded post to the outside of the moving block. Pulling the operating rod along the axial direction of the guide groove can disengage the ratchet from the ratchet. Rotating the operating rod into the limiting groove can temporarily lock the ratchet disengagement position.

[0016] The present invention has the following advantages: (1) Compared with the above-mentioned background technology, the integrated grounding connection device for ring main unit base provided by the present invention achieves composite clamping of the grounding lead plate on both sides and the top and bottom sides by means of a single continuous operation of rotating the fastening screw through the coordinated design of the split clamping block structure and the transmission component. In the initial stage, the lateral movement resistance of the clamping groove is small and the torque requirement of the screw is low; after the lateral clamping is in place, the screw is rotated to automatically trigger the conductive plate to press the grounding lead plate from below without additional adjustment. When disassembling, the screw is rotated in the opposite direction, the conductive plate is disengaged first, and the lateral clamping is then released, avoiding the problem of the contact surface seizing up.

[0017] (2) Compared with the above-mentioned background technology, the integrated grounding connection device for ring main unit base provided by the present invention constructs an adaptive one-way locking mechanism through the cooperation of the anti-retraction component and the trapezoidal square groove. During the clamping process, when the slider slides from the narrow end to the wide end of the square groove, the wedge block group automatically and gradually extends, eventually forming a large-area contact with the inclined inner wall, generating frictional self-locking and geometric constraint, and rigidly locking the conductive plate in the compacted position. Even if the drive-side thread loosens slightly, the slider cannot retract, thereby maintaining a constant clamping force on the lower surface of the grounding lead plate, enhancing the long-term stability and safety margin of the connection system. At the same time, the manual unlocking device can release the self-locking through simple operation, taking into account both reliability and maintenance convenience. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the base structure of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at point A; Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B; Figure 5 This is a schematic diagram of the movable block structure of the present invention; Figure 6 This is a schematic cross-sectional view of the clamping block of the present invention; Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at point C; Figure 8 This is a schematic diagram of the internal structure of the slider of the present invention; Figure 9 This is a schematic diagram of the anti-retraction component structure of the present invention; Figure 10 This is a schematic diagram of the ratchet structure of the present invention; Figure 11 This is a schematic diagram of the internal structure of the outer cylinder of the present invention.

[0020] In the diagram: 1. Cabinet; 2. Base; 3. Clamping plate assembly; 4. Conductive plate; 5. Connector; 6. Transmission component; 7. Anti-retraction component; 8. Elastic control component; 9. Protrusion; 10. Operating lever; 11. Guide groove; 12. Limiting groove; 14. Square groove; 15. Insulating sleeve; 16. Grounding lead plate; 301. Screw assembly; 3011. Fixed bracket; 3012. Screw; 3013. Clamping block; 3014. Clamping groove; 3131. Moving block; 3132. Clamping Block; 501, slider; 502, sliding sleeve; 503, sliding rod; 504, elastic element; 601, top rod; 602, wedge groove; 701, wedge block assembly; 702, mounting groove; 703, one-way control assembly; 711, wedge block body; 712, connecting rod; 713, top block; 731, rotating shaft; 732, ratchet; 733, ratchet tooth; 734, cam; 801, outer cylinder; 802, sliding column; 803, rotating column; 804, threaded column; 805, telescopic spring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides an integrated grounding connection device for the base of a ring main unit. Its separate clamping block and transmission component allow for multi-faceted composite clamping and disassembly with just the rotation of the screw. It also solves the problems that ring main unit grounding connections often use fixed structures, which are difficult to disassemble after installation, require cutting tools or treatment of rusted bolts during maintenance, are time-consuming and laborious, and are prone to damaging components, and lack a flexible disconnection mechanism.

[0024] Please refer to this as well. Figures 1 to 11 The present invention provides an integrated grounding connection device for a ring main unit base, which includes a connection mechanism disposed in the base 2. The connection mechanism is used to connect the grounding wire of the equipment to the earth, and the cabinet 1 of the ring main unit is disposed above the base 2.

[0025] Specifically, the connection mechanism includes a grounding plate, which is embedded in the ground below the base 2. In addition, a grounding lead plate 16 is fixed above the grounding plate. The top of the grounding lead plate 16 extends through the bottom plate of the base 2 into the interior of the base. An insulating sleeve 15 is fixed to the bottom plate of the base, and the grounding lead plate 16 extends into the interior of the base 2 through this insulating sleeve. A clamping plate assembly 3 is provided inside the base 2 to contact the grounding lead plate 16 by clamping. The grounding wire of the equipment is fixedly connected to the clamping plate assembly 3.

[0026] Specifically, such as Figures 1-4As shown, the core driving component of the clamping plate assembly 3 is the screw assembly 301. A fixed bracket 3011 is fixed to the base via a support rod, and a fastening screw 3012 horizontally passes through the bracket and can rotate around its own axis. A clamping block 3013 is fitted to the threaded section of the screw, and the clamping block 3013 is threadedly connected to the screw. By rotating the fastening screw 3012, the clamping block 3013 can be driven to move laterally along the screw axis. The clamping block 3013 has a clamping groove 3014 on its top inner side, which can be inserted and engaged with the edge of the grounding lead plate 16. When the fastening screw 3012 rotates and moves the clamping block 3013, the clamping groove 3014 clamps the grounding lead plate 16, achieving a firm clamping; rotating the screw in the opposite direction causes the clamping block 3013 to move in opposite directions, thereby releasing the grounding lead plate 16 and completing the separation.

[0027] In actual installation, if the clamping block 3013 is moved solely by the screw assembly 301, causing the inner wall of the clamping groove 3014 to clamp the grounding lead plate 16 from both sides, the actual contact area between the clamping block 3013 and the grounding lead plate 16 is relatively limited, mainly concentrated in the end area of ​​the grounding lead plate 16. This limited contact area affects the grounding effect. Therefore, it is advisable to add conductive plates 4 to the upper and lower inner walls of the clamping groove 3014, allowing them to simultaneously cover and press the upper and lower surfaces of the grounding lead plate 16, thereby increasing the contact area and improving the grounding effect.

[0028] However, while adding conductive plates 4 helps to enhance the clamping surface, it also complicates the installation process: operators must first rotate the fastening screw 3012 to initially clamp the grounding lead plate 16 on both sides with the clamping block 3013, and then further adjust the upper and lower conductive plates 4 to press the upper and lower surfaces of the grounding lead plate 16 together, significantly increasing labor intensity. If, in order to simplify installation, the size of the clamping groove 3014 is designed to form an interference fit with the contour of the grounding lead plate 16, attempting to achieve multi-faceted tight clamping at once when the clamping blocks 3013 move in opposite directions, it will lead to a significant increase in the friction path, causing a sharp increase in the driving force required for screw fastening, which will also increase the operational burden.

[0029] Furthermore, while interference fit can enhance clamping force, it may cause uneven pressure distribution on all surfaces of the clamping block 3013 during clamping: if clamping is prioritized on both sides, the clamping force on the upper and lower surfaces cannot be guaranteed; conversely, if the upper and lower surfaces are excessively clamped, the clamping block 3013 may become stuck during disassembly due to seizing of the contact surfaces, making it difficult to remove and even requiring external force to separate, thus reducing the efficiency of subsequent disassembly. Therefore, achieving a balance between increasing the contact area, ensuring clamping stability, and simplifying operation and facilitating assembly and disassembly has become an important consideration in optimizing the connection structure.

[0030] To avoid the above problems, this embodiment sets the clamping block 3013 into a split structure, such as... Figures 2-5As shown, the device is divided into two parts: a bottom movable block 3131 and a top clamping block 3132. The movable block 3131 is threadedly connected to the fastening screw 3012 and is responsible for transmitting the drive. The clamping block 3132 has a clamping groove 3014 extending through its clamping surface and front and rear end faces to accommodate the grounding lead plate 16, and the height of the clamping groove 3014 is slightly greater than the thickness of the grounding lead plate 16. The key improvement is that a conductive plate 4 is provided at the bottom of the clamping groove 3014, which moves longitudinally by being limited by a rod and normally fits against the bottom of the groove. The clamping block 3132 and the movable block 3131 are coupled by a set of connectors 5, allowing the clamping block 3132 to move horizontally along the screw axis above the movable block 3131 while being longitudinally locked. In addition, a transmission component 6 is provided between the two. Its core function is: after the fastening screw 3012 rotates and drives the moving block 3131 to move and initially clamp the grounding lead plate 16, if the screw continues to rotate, the transmission component 6 will drive the conductive plate 4 in the clamping block 3132 to move upward and press the grounding lead plate 16 from below. Thus, by simply rotating the fastening screw 3012 in one continuous operation, multi-faceted coordinated clamping from both sides to the bottom can be achieved sequentially, enhancing the clamping effect and ease of operation.

[0031] Specifically, such as Figures 3-6 As shown, the connecting member 5 is implemented as follows: a square groove 14 is recessed downwards on the upper surface of the movable block 3131. The connecting member 5 mainly includes a slider 501, a sliding sleeve 502, a sliding rod 503, and an elastic element 504. The slider 501 is fixed below the clamping block 3132, and its length along the screw axis is less than that of the clamping block 3132, allowing the slider 501 to slide into the square groove 14, while the lower end face of the clamping block 3132 remains in contact with the upper end face of the movable block 3131. A set of sliding rods 503 is fixedly installed inside the square groove 14, with both ends of the sliding rods 503 fixed to the two end walls of the square groove 14 along the screw axis. A set of sliding sleeves 502 is fixed inside the slider 501, and the sliding sleeves 502 slidably engage with the sliding rods 503. This structure ensures that the clamping block 3132 can only move along the screw axis relative to the movable block 3131, achieving guidance and longitudinal locking. To provide elastic support and set the initial position, an elastic element 504 is also provided in the square groove 14, specifically a support spring sleeved on the slide rod 503. One end of the support spring abuts against the inner wall of the square groove 14, and the other end abuts against the end of the slide sleeve 502. It is arranged on the side of the slider 501 facing away from the middle of the screw, so that the slider 501 is elastically pushed to the initial position in the square groove 14 near the middle of the screw under normal conditions, reserving travel space for the subsequent transmission action of the conductive plate 4.

[0032] Specifically, the transmission component 6 is formed by the push rod 601 and the wedge groove 602 working together. The push rod 601 is vertically fixed to the bottom surface of the conductive plate 4 and extends downwards through the clamping block 3132 and the slider 501, allowing it to move freely in the longitudinal direction. A rectangular wedge groove 602 is recessed into the bottom wall of the square groove 14, its length direction aligned with the axial direction of the fastening screw 3012. The bottom wall of the wedge groove 602 is machined into a slope, with its lowest point located near the middle of the fastening screw 3012, and its highest point facing the end of the screw. The bottom end of the push rod 601 extends into this wedge groove 602 and always rests against the slope. Supported by the support spring, the slider 501 is normally located within the square groove 14 near the middle of the screw, at which point the bottom end of the push rod 601 is at the lowest point of the slope, and the conductive plate 4 is in contact with the bottom wall of the clamping groove 3014. When secondary clamping is required, after the clamping block 3132 is basically fixed, continuing to rotate the fastening screw 3012 will cause the moving block 3131 to move further towards the middle of the screw. This relative movement will compress the spring and push the bottom end of the push rod 601 to slide from the lowest point to the highest point along the inclined surface of the wedge groove 602, thereby converting the horizontal movement into the longitudinal lifting of the push rod 601, which will ultimately drive the conductive plate 4 to move upward and compact the grounding lead plate 16 from below.

[0033] During clamping, the entire process is achieved through the continuous rotation of the fastening screw 3012. First, the rotation of the fastening screw 3012 drives the moving block 3131 to move. At this time, supported by the spring, the clamping block 3132 moves synchronously with the moving block 3131, with no relative displacement between them. As the screw continues to rotate, its clamping groove 3014 gently fits into the grounding lead plate 16. In this initial stage, the top wall of the clamping groove 3014 naturally adheres to the upper surface of the grounding lead plate 16, mainly relying on the weight of the device itself, while the bottom conductive plate 4 maintains a certain distance from the grounding lead plate 16. Therefore, almost no additional vertical friction is generated during lateral movement, and the torque required for screw rotation is small. After the side wall of the clamping groove 3014 initially contacts the two end faces of the grounding lead plate 16, the screw is tightened further, and the clamping block 3132 begins to laterally clamp the grounding lead plate 16. If further torque is applied, the clamping block 3132 will be unable to move further because the sidewall of the clamping groove 3014 is already pressed against the grounding lead plate 16. At this time, the rotation of the fastening screw 3012 will force the moving block 3131 to produce an independent displacement relative to the clamping block 3132. This relative movement compresses the spring on the one hand, further amplifying the clamping force on the side of the grounding lead plate 16 through the spring force; on the other hand, the displacement of the moving block 3131 causes the bottom end of the push rod 601 to slide from the lowest point to the highest point along the inclined surface of the wedge groove 602, thereby pushing the push rod 601 upward and causing the conductive plate 4 to press against the bottom surface of the grounding lead plate 16 from below. Thus, through a continuous rotation operation, the combined clamping of the two sides and the top and bottom surfaces of the grounding lead plate 16 is achieved in sequence, significantly improving the stability and reliability of the clamping. During disassembly, rotating the screw in the opposite direction first causes the spring to push the moving block 3131 back to its original position, allowing the top rod 601 to slide back to its lowest point along the inclined plane. The conductive plate 4 then descends and disengages from the grounding lead plate 16, thus relieving the friction between the upper and lower parts. Subsequently, as the screw continues to rotate, it drives the clamping block 3132 to move outward synchronously, easily releasing the lateral clamp. This design avoids the problem of the contact surfaces seizing up during disassembly, ensuring overall ease of operation.

[0034] It should be noted that the conductive plate 4 is made of conductive material, and the grounding wire of the equipment is directly electrically connected to the conductive plate 4.

[0035] To fundamentally improve the anti-loosening capability of the clamping plate assembly 3 under long-term use and ensure the durability and stability of the clamping force, this embodiment introduces a multi-layered anti-loosening locking scheme based on the original clamping mechanism. The core of this scheme is that after the operator completes clamping by rotating the fastening screw 3012, the locking nut can be tightened at an appropriate position on the screw, making it tightly adhere to and press against the outer end face of the moving block 3131. This provides a basic and direct anti-loosening barrier for the entire drive system, effectively resisting the rotational tendency of the screw caused by minor vibrations.

[0036] However, recognizing the potential slippage risk of threaded pairs under extreme alternating loads, this embodiment further incorporates a mechanical self-locking mechanism as a second line of defense. The key to this mechanism lies in applying a unidirectional constraint to the motion degree of freedom of the slider 501 within the square groove 14, such as... Figure 4 , Figure 7 As shown, this is specifically achieved by adding an anti-retraction component 7 with elasticity and a wedge-shaped feature to the slider 501. Once the clamping action is completed, the push rod 601 is pushed to the highest point of the inclined wedge groove 602, and the anti-retraction component 7 automatically intervenes, interlocking with the specific structure of the square groove 14, thereby preventing the slider 501 from sliding back to its initial position under the action of the spring restoring force. This means that even if the moving block 3131 and the screw thread loosen slightly due to unforeseen strong vibrations, the slider 501 will be firmly locked in its current position by the anti-retraction component 7. At this time, since the slider 501 cannot move backward, the push rod 601 can remain at the high point of the inclined plane, and the conductive plate 4 at its top will not fall down accordingly, thereby maintaining a constant clamping force on the lower surface of the grounding lead plate 16. This ensures that when loosening occurs on the drive side, the clamping effect on the execution side will not immediately and synchronously decline, enhancing the safety margin and reliability of the entire clamping system.

[0037] To achieve the aforementioned anti-retraction function, the structure of the square groove 14 has been specifically optimized in this embodiment. Specifically, the inner walls of the square groove 14 along both sides of the fastening screw 3012 axis, i.e., the inner walls parallel to the screw axis, are machined as symmetrical inclined planes, rather than the traditional vertical planes. Viewed from above, the entire square groove 14 thus presents a clear isosceles trapezoidal outline, with its narrower end pointing towards the middle of the fastening screw 3012, i.e., the direction in which the two clamping blocks 3013 approach each other; while the wider end faces the end of the screw.

[0038] To ensure stable anti-reverse function and ease of maintenance, in this embodiment, the slider 501 is designed to be detachably connected to the lower part of the clamping block 3132 via standard parts such as bolts. Figure 7 and Figure 8 As shown, the anti-retraction component 7 includes a wedge assembly 701, a mounting groove 702, and a one-way control assembly 703. A set of retractable wedge assemblies 701 is provided on each side of the slider 501, facing the inclined inner walls of the square groove 14. Each wedge assembly 701 protrudes from one end of the slider 501, and its contact surface is machined to perfectly match the corresponding inclined inner surface of the square groove 14, ensuring a large-area fit. The top surface of the slider 501 has a recessed elongated mounting groove 702, which houses a set of one-way control assemblies 703. Both sets of wedge assemblies 701 extend into the mounting groove 702 via mechanical connection and work in conjunction with the one-way control assembly 703. Furthermore, they are configured in a one-way elastic telescopic mode: the wedge assembly 701 can only extend and cannot retract.

[0039] Specifically, such as Figure 7 and Figure 8 As shown, each wedge assembly 701 consists of three main components: a wedge body 711, a connecting rod 712, and a top block 713. The wedge body 711, acting as the component directly performing the locking function, is located on the outer side of the slider 501, with its side facing the inclined inner wall of the square groove 14 forming a mating slope. A set of connecting rods 712 is fixed at one end facing the slider 501 body, extending inward through the side wall of the mounting groove 702 into the interior space of the mounting groove 702. At the end of the connecting rod 712 located within the mounting groove 702, a top block 713 is securely fixed. This top block 713 acts as a transmission and force-bearing intermediary, its specific surface maintaining contact with the one-way control assembly 703 installed within the groove.

[0040] The one-way control unit 703 is the core component for realizing the mechanical self-locking function, such as... Figures 8-9 As shown, the component mainly includes a vertically arranged rotating shaft 731, a ratchet 732, a ratchet tooth 733, and a cam 734. The lower end of the rotating shaft 731 is rotatably connected to the bottom wall of the mounting groove 702, allowing it to rotate freely. The ratchet 732 is coaxially mounted on the rotating shaft 731, and its outer circumference is arrayed with multiple teeth having a unidirectional tilting characteristic. A ratchet tooth 733 is inserted radially along the ratchet 732, and its radial elastic extension and contraction are achieved by means of a set of elastic control elements 8; the ratchet tooth 733 is designed with one side being a slope and the other side being a straight surface, and through a specific engagement with the teeth of the ratchet 732, it strictly restricts the ratchet 732 to rotate only in a single direction.

[0041] Above the ratchet 732, a cam 734 is fixedly connected coaxially to the shaft 731. The outer ring of the cam 734 is symmetrically provided with two specially contoured protrusions 9: one end of each protrusion 9 smoothly transitions to the outer ring of the cam 734, while the other end extends outwards along both the circumference and radial direction of the cam 734, forming a gradually rising ramp structure. The positions of these two protrusions 9 are precisely aligned to interact with the top blocks 713 from the wedge block assemblies 701 on both sides of the slider 501. Furthermore, a torsion spring is connected between the shaft 731 and the bottom wall of the mounting groove 702. Its preset torque causes the cam 734 to be driven to rotate to a specific angle when the torsion spring is in a naturally released state. At this angle, the highest point of the protrusion 9's contour contacts the corresponding top block 713, thereby pushing the wedge block 711 out to its maximum extension length. When the wedge block 711 is in this extreme position, the total width of its two inclined surfaces matches the internal dimensions of the widest end of the square groove 14. This geometric relationship physically prevents the slider 501 from moving to the narrow end of the square groove 14, thereby rigidly locking the top rod 601 and its driven conductive plate 4 at the highest point of the inclined surface of the wedge groove 602, ensuring the stability of the clamping force.

[0042] Based on the above structural design, the anti-retraction mechanism exhibits adaptive and unidirectional locking characteristics. In the initial unlocked state of the device, due to the support spring in the connector 5, the slider 501 is pushed against the narrow end of the square groove 14 near the middle of the fastening screw 3012. At this time, the wedge block 711 is in a retracted state, and the area on the protrusion 9 that contacts the top block 713 is the lowest point. The unidirectional engagement relationship between the ratchet 732 and the ratchet tooth 733 is oriented so that the cam 734 can only rotate in the direction from "the lowest point of the protrusion 9 contacts the top block 713" to "the highest point of the protrusion 9 contacts the top block 713", and the reverse rotation is mechanically locked. This means that in the subsequent clamping process, when the moving block 3131 moves independently relative to the clamping block 3132 and drives the slider 501 to slide from the narrow end to the wide end in the square groove 14, the wedge block 711 can smoothly and gradually extend outward. Once the slider 501 moves to the widest end of the square groove 14, the push rod 601 reaches and remains at the highest point of the inclined surface of the wedge groove 602. At this point, the conductive plate 4 has completed the compaction of the bottom surface of the grounding lead plate 16. Simultaneously, the fully extended wedge block 711 forms a large-area contact with the inclined inner wall of the square groove 14, generating strong frictional self-locking and geometric constraints, thereby firmly restricting the slider 501 to this final position.

[0043] Considering the need for easy disassembly during maintenance, such as Figure 3 , Figure 4 , Figure 7 , Figure 10As shown, this embodiment features a specially designed manual unlocking device integrated into the anti-reverse mechanism. The core of this device is an elastic control component 8, whose structure includes an outer cylinder 801 fixed to the wall of the mounting groove 702, a sliding column 802 fixedly connected to one end of the ratchet 733, a rotating column 803, a threaded column 804, and a telescopic spring 805. The sliding column 802 is slidably inserted into the interior of the outer cylinder 801, with its end inside the cylinder rotatably connected to the rotating column 803. The two can rotate relative to each other but remain axially fixed. At the other end of the outer cylinder 801, an adjustable threaded column 804 is threadedly connected. The telescopic spring 805 provides elastic support between the rotating column 803 and the threaded column 804, thereby enabling the ratchet 733 to have radial elastic extension and retraction capabilities. Furthermore, a clearance hole is precisely calculated and opened on the wall of the square groove 14. When the slider 501 moves to its widest locking position, the entire outer cylinder 801 can pass through this hole, exposing the end with the threaded column 804 to the outside of the moving block 3131 for easy operation. An operating rod 10 is fixed on the column of the rotating column 803. The operating rod 10 extends out of the cylinder through an elongated guide groove 11 opened on the wall of the outer cylinder 801. At the end of this elongated guide groove 11, a limiting groove 12 is also opened perpendicularly to it along the circumference of the outer cylinder 801. When disassembly is required, the operator can first pull the operating lever 10 outward, causing it to slide axially along the elongated guide groove 11. This, through the sliding column 802, drives the ratchet 733 to move as a whole, disengaging it from the ratchet 732 and thus releasing the restriction on the unidirectional rotation of the ratchet 732. Subsequently, rotating the operating lever 10 causes it to engage in the vertical limiting groove 12, temporarily locking the ratchet 733 in the disengaged position. At this time, the wedge block 711 retracts without reverse limiting, and the self-locking state of the slider 501 is released. Afterward, the operator can sequentially perform the resetting of the moving block 3131 and the lateral clamping release operation, realizing the sequential disassembly of the entire device, greatly improving the convenience and efficiency of maintenance work.

[0044] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0045] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A grounding connection device, comprising a connection mechanism, characterized in that, The connection mechanism includes a clamp assembly (3) that mates with a grounding lead plate (16), the grounding lead plate being used to lead from the grounding side conductor to the installation space; It also includes a fastening screw, which is rotatably mounted via a bracket and threadedly engages with a movable block (3131) in the clamping plate assembly; The clamping plate assembly includes a separate movable block (3131) and a clamping block (3132). The clamping block (3132) has a clamping groove (3014). The bottom of the clamping groove (3014) is provided with a conductive plate (4) that can move longitudinally. The conductive plate (4) is used to be electrically connected to the grounding wire and pressed onto the surface of the grounding lead plate (16). The clamping block (3132) and the moving block (3131) are coupled by a connector (5), so that the clamping block can be translated along the screw axis and locked longitudinally; A transmission component (6) is also provided between the clamping block (3132) and the moving block (3131). When the fastening screw rotates to clamp the clamping block in the side position and continues to rotate, the transmission component (6) converts the relative displacement of the moving block into the upward movement of the conductive plate (4) to compact the grounding lead plate (16).

2. The grounding connection device according to claim 1, characterized in that, The installation space is the installation space inside the ring main unit base (2); The connector (5) includes a square groove (14) opened on the upper end face of the movable block (3131), a slider (501) fixed below the clamping block (3132), a slide rod (503) fixed in the square groove (14), a slide sleeve (502) slidably sleeved on the slide rod (503), and an elastic member (504) sleeved on the slide rod (503). The slider (501) is slidably inserted into the square groove (14). One end of the support spring abuts against the inner wall of the square groove (14) and the other end abuts against the end of the sliding sleeve (502), so that the slider (501) is elastically pushed to the initial position near the middle of the screw in the square groove (14) under normal conditions.

3. A grounding connection device according to claim 2, characterized in that, The transmission component (6) includes a top rod (601) that is vertically fixed to the bottom surface of the conductive plate (4) and a wedge groove (602) that is opened in the bottom wall of the square groove (14). The top rod (601) passes through the clamping block (3132) and the slider (501) in sequence, and its bottom end extends into the wedge groove (602) and always abuts against the inclined surface of the wedge groove (602); the lowest point of the inclined surface of the wedge groove (602) is located on the side close to the middle of the screw, and the highest point faces the end of the screw.

4. A grounding connection device according to claim 2, characterized in that, The inner walls of the square groove (14) along the screw axis are symmetrical inclined planes, making the square groove (14) have an isosceles trapezoidal profile, with its narrow end pointing to the middle of the screw and its wide end pointing to the end of the screw.

5. A grounding connection device according to claim 4, characterized in that, The slider (501) is provided with an anti-retraction component (7), which includes a retractable wedge assembly (701), a mounting groove (702), and a one-way control assembly (703). The wedge assembly (701) is located on the slider (501) facing the inclined inner walls on both sides of the square groove (14), and its exposed end has an inclined surface that matches the inclined surface of the inner side of the square groove (14). The one-way control assembly (703) is accommodated in the mounting groove (702) and cooperates with the wedge assembly (701) so that the wedge assembly (701) can only extend and cannot retract.

6. A grounding connection device according to claim 5, characterized in that, The wedge assembly (701) includes a wedge body (711), a connecting rod (712), and a top block (713); the wedge body (711) is located on the outer side of the slider (501), the connecting rod (712) extends through the side wall of the mounting groove (702) into the mounting groove (702), and the top block (713) is fixed to the end of the connecting rod (712) and contacts the one-way control assembly (703).

7. A grounding connection device according to claim 5, characterized in that, The one-way control group (703) includes a vertically arranged rotating shaft (731), a ratchet (732) coaxially mounted on the rotating shaft (731), a ratchet tooth (733) inserted radially along the ratchet (732), and a cam (734) coaxially fixed with the rotating shaft (731). The ratchet (733) achieves radial elastic extension and retraction through the elastic control element (8) and engages with the unidirectional teeth of the ratchet (732), restricting the ratchet (732) to rotate only in one direction; The outer ring of the cam (734) is symmetrically provided with two protrusions (9), which have a gradually raised ramp structure and interact with the top block (713) of the two wedge block groups (701) respectively.

8. A grounding connection device according to claim 7, characterized in that, A torsion spring is connected between the rotating shaft (731) and the bottom wall of the mounting groove (702). When the torsion spring is in a naturally released state, the cam (734) is driven to rotate to the position where the highest point of the protrusion (9) contacts the top block (713), so that the wedge block (711) extends to its maximum length, and the total width of its two inclined surfaces matches the internal size of the widest end of the square groove (14).

9. A grounding connection device according to claim 7, characterized in that, The elastic control component (8) includes an outer cylinder (801) fixed to the wall of the mounting groove (702), a sliding column (802) fixedly connected to one end of the ratchet (733), a rotating column (803) rotatably connected to the sliding column (802), a threaded column (804) threadedly connected to the outer cylinder (801), and a telescopic spring (805) disposed between the rotating column (803) and the threaded column (804); an operating rod (10) is fixed on the rotating column (803), the operating rod (10) extends out of the cylinder through the elongated guide groove (11) on the outer cylinder (801), and a limiting groove (12) perpendicularly intersecting with the guide groove (11) is provided at the end of the guide groove (11).

10. A grounding connection device according to claim 9, characterized in that, The square groove (14) has a corresponding clearance hole on its groove wall. When the slider (501) moves to the widest end and locks, the outer cylinder (801) passes through the clearance hole, exposing the threaded column (804) to the outside of the moving block (3131). Pulling the operating rod (10) to slide along the guide groove (11) axially can disengage the ratchet (733) from the ratchet (732). Rotating the operating rod (10) to engage the limiting groove (12) can temporarily lock the ratchet (733) in the disengaged position.

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