Composite insulator anti-bird grading ring

Abstract

The invention provides an anti-bird grading ring of a composite insulator, relates to the field of grading rings, and aims to solve the problem that a connection structure of a conventional anti-bird grading ring is complex in shape, easy to cause casting defects and easy to break or lose efficacy in advance in operation. One end of the umbrella skirt unit extends out of the fixed cylinder unit, the two units are spliced to form a cylindrical fixed cylinder, and a convex positioning block is arranged on the periphery of the cylindrical fixed cylinder; a clamping groove is formed in the inner ring of the hoop, when the fixing cylinder is sleeved with the hoop, the positioning block is embedded into the clamping groove, and the relative positions of the two umbrella skirt units are fixed through the restraining force of the hoop. The positioning block is only used for axial limiting of the hoop, non-main force-bearing components are adopted, main force bearing is still achieved through radial constraint of the hoop on the fixing cylinder, the casting difficulty is lowered, the casting precision is improved, the problem that molten metal is not fully filled due to a hole structure is solved, and the stability in the operation process is improved.

Description

Technical Field

[0001] The present invention relates to the field of grading rings, and in particular to a bird-proof grading ring for a composite insulator. Background Art

[0002] In the power industry, grading rings can improve the electric field distribution at the ends and along the surface of composite insulators, making the voltage evenly distributed across the entire insulator string, reducing the electric field strength along the surface of the insulator, and avoiding corona. Bird-proof grading rings add metal discs and other structures to prevent bird droppings from falling directly onto the shed, reducing the probability of bird droppings short-circuiting the insulation distance between the high and low voltage ends, and reducing the occurrence of bird-induced tripping accidents.

[0003] Considering the production efficiency and cost issues, the current bird-proof grading ring mostly adopts a cast one-piece molding structure, which consists of two semi-circular shed units. The center grooves of the two shed units can be spliced ​​to form a through hole for the insulator to pass through. The splicing position of the shed units is formed with a protruding ear plate with a hole and other connecting structures, especially near the through hole. The ear plate with a hole is used with bolts to connect and fix the two sheds. Figure 1 As shown in the figure. Since the connecting structures, such as the perforated lugs, formed on the semicircular shed units are complex and located at the intersection of multiple variable structures, the metal liquid has poor fluidity in these connecting structures during casting, resulting in defects such as casting holes. These connecting structures are precisely the stress-bearing locations for fasteners such as bolts. Casting defects can significantly reduce the effective stress-bearing area of ​​these connecting structures. Furthermore, the notch effect caused by these defects, the stress concentration of the complex structures caused by installation stress and wind loads during operation, can lead to fractures during installation or premature failure during operation, damaging or even falling off the anti-bird equalizing ring. Summary of the Invention

[0004] The purpose of the present invention is to address the defects of the existing technology and provide a composite insulator bird-proof equalizing ring, which changes the connection method of the traditional perforated ear plate into a combined structure of a fixed tube unit and a hoop, and a fixed tube unit extends from one end of the umbrella skirt unit. The two units are assembled to form a cylindrical fixed tube, and a raised positioning block is provided on the outer periphery; a groove is provided on the inner ring of the hoop, and when it is sleeved on the outside of the fixed tube, the positioning block is embedded in the groove, and the relative positions of the two umbrella skirt units are fixed by the restraining force of the hoop; the positioning block is only used for axial limitation of the hoop, and is not a major load-bearing component. The main load-bearing is still achieved by the radial constraint of the hoop on the fixed tube, thereby meeting the casting production and service requirements of the bird-proof equalizing ring.

[0005] In order to solve the above problems, the following solutions are adopted: A composite insulator bird-proof grading ring, comprising: The shed unit is in the shape of a semicircular ring. Two shed units are radially spliced ​​together to form an annular shed with a mounting hole at its center. One end of the shed unit extends axially along the mounting hole to form a fixed tube unit. The two shed units correspond to the fixed tube unit and are spliced ​​together to form a cylindrical fixed tube. The fixed tube is connected to the mounting hole. A raised positioning block is provided on the outer periphery of the fixed tube unit. The fixed tube unit and the shed unit are integrally cast. The inner ring of the hoop is provided with a slot, which can be detachably sleeved on the outside of the fixed tube. The positioning block is inserted into the slot. The hoop imposes constraints on the fixed tube to maintain the relative positions of the two umbrella skirt units.

[0006] Furthermore, the fixing tube and the mounting hole are coaxially distributed, and the inner wall of the mounting hole and the inner wall of the fixing tube are coaxially connected to form a stepped hole, and the diameter of the inner wall of the mounting hole is larger than the diameter of the inner wall of the fixing tube.

[0007] Furthermore, the inner wall generatrix and the outer wall generatrix of the fixed cylinder are both parallel to the axis of the fixed cylinder, and the fixed cylinder body is a cylindrical structure with uniform wall thickness.

[0008] Furthermore, at least one positioning block is provided on the outer circumference of each of the fixed cylinder units, and the clamp cooperates with at least one positioning block on each fixed cylinder unit of the same fixed cylinder.

[0009] Furthermore, the positioning blocks that match the same clamp are located at the same axial position of the fixed tube, and the positioning blocks are inserted into the slots to form an engagement to fix the relative axial positions of the clamp and the fixed tube.

[0010] Furthermore, the clamping groove is an annular groove, and when the clamp is not locked, the clamp can rotate around the fixing tube under the guidance of the positioning block to adjust the circumferential position.

[0011] Furthermore, the positioning block is an annular protrusion, and along the radial direction of the fixed cylinder, the positioning block is provided with a taper to form a guide for the cooperation between the slot and the positioning block.

[0012] Furthermore, the clamp includes two semicircular ring-shaped clamps hinged at one end, and the other ends of the two clamps are detachably connected by fasteners.

[0013] Furthermore, the clamps are respectively provided with clamping grooves, and the two clamps are clamped together to form an annular clamp, and the corresponding clamping grooves of the two clamps are connected after being clamped together.

[0014] Furthermore, the end surface of the umbrella skirt unit is a smooth fan-shaped surface, and the joint surfaces of the two umbrella skirt units are in contact with each other.

[0015] Compared with the prior art, the present invention has the following advantages and positive effects: The connection structure of the traditional bird-proof equalizing ring is complex and prone to casting defects, which may lead to breakage or premature failure during operation. The connection method of the traditional perforated ear plate is changed to a combination structure of a fixed tube unit and a hoop. The fixed tube unit extends from one end of the umbrella skirt unit. The two units are assembled to form a cylindrical fixed tube with a raised positioning block on the outer periphery. A slot is provided on the inner ring of the hoop. When it is put on the outside of the fixed tube, the positioning block is embedded in the slot, and the relative positions of the two umbrella skirt units are fixed by the constraint force of the hoop. The positioning block is only used for axial limitation of the hoop and is not the main load-bearing component. The main load-bearing is still achieved by the radial constraint of the hoop on the fixed tube. The positioning block is a simple raised structure. Compared with the original perforated ear plate, it has a regular shape and no holes. It is in a single edge area rather than a multi-structure intersection. After the bolt hole is eliminated, the fluidity of the metal liquid in this area during casting is significantly improved, which reduces the casting difficulty, improves the casting accuracy, avoids the problem of insufficient metal liquid filling due to the hole structure, and improves the stability during operation.

[0016] Compared with the ordinary groove positioning structure, the groove structure needs to fill the concave area with molten metal during casting. The flow resistance of the molten metal in the concave area is large, which easily leads to bubble retention and insufficient filling, resulting in holes or shrinkage defects. In addition, the concave structure is prone to wear during demolding, affecting the accuracy of the casting. The present invention adopts a raised positioning block, and the convex molding mold is simple in design, without the need for a core-pulling structure, avoiding the problem of difficult molding of the concave structure and improving the surface quality of the casting. The cooling and shrinkage of the molten metal at the positioning block are uniform, giving priority to ensuring the strength of the force-bearing structure at the fixed cylinder position and reducing the adverse effects on the strength of the fixed cylinder.

[0017] The uniform wall thickness structure avoids uneven cooling rate caused by sudden changes in cross-section during the flow of molten metal, reduces defects such as shrinkage holes and cracks, and improves casting yield; the uniform wall thickness makes the circumferential strength of the fixed tube consistent, and there is no weak point when bearing the constraint force of the clamp, and the wind load fatigue resistance is enhanced; the standardized cylindrical structure can share the mold, reduce production costs, and adapt to the mass production of equalizing rings of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 Schematic diagram of a traditional bird-proof equalizing ring in the background technology.

[0020] Figure 2 Schematic diagram of the umbrella skirt unit in Example 1 of the present invention.

[0021] In the figure, 1. Umbrella skirt unit; 2. Splicing surface; 3. Ear plate with holes; 4. Breaking point; 5. Fixed tube unit; 6. Positioning block; 7. Fixed tube; 8. Mounting hole. DETAILED DESCRIPTION

[0022] Example 1 In a typical embodiment of the present invention, Figure 1-Figure 2 As shown, a composite insulator bird-proof grading ring is provided.

[0023] The existing bird-proof equalizing ring adopts a one-piece casting structure. The connecting structures such as the perforated ear plate 3 of the semi-circular umbrella skirt unit 1 are complex in shape and are located in the intersection area of ​​multiple structures. During casting, the metal liquid has poor fluidity in this area, which is prone to defects such as casting holes and shrinkage, resulting in a significant decrease in the mechanical properties of the connecting structure. The perforated ear plate 3 is the stress-bearing position of fasteners such as bolts. Casting defects will reduce the effective stress-bearing area. At the same time, under the action of external forces such as installation stress and wind load, the defects will produce notch effects and stress concentration, causing the equalizing ring to break during installation or fall off prematurely during operation. Figure 1 The fracture 4 shown affects the bird protection and electric field homogenization functions. Based on this, this embodiment provides a composite insulator bird protection and grading ring. This eliminates the complex casting connection structure and replaces the traditional perforated ear plate 3 connection method with a combined structure of a fixed tube unit 5 and a clamp. The fixed tube unit 5 extends from one end of the shed unit 1. The two units are assembled to form a cylindrical fixed tube 7 with a raised positioning block 6 on the outer periphery. The inner ring of the clamp is provided with a slot. When it is inserted into the outer periphery of the fixed tube 7, the positioning block 6 engages the slot, and the relative position of the two shed units 1 is fixed by the restraining force of the clamp.

[0024] From cast connection to detachable mechanical connection, the traditional solution relies on the bolt connection of the ear plate formed by casting. In this embodiment, the complex cast connection is converted into a mechanical assembly by combining the mechanical clamp with the positioning block 6 and the slot structure. The structure of the fixed cylinder unit 5 and the positioning block 6 is simpler, which is convenient for casting, reduces the intersection area of ​​multiple structures, and reduces the probability of casting defects; the clamp cooperates with the positioning block 6 through the slot, and the force path is more direct, avoiding the stress concentration problem at the traditional ear plate.

[0025] like Figure 2 As shown, a composite insulator bird-proof grading ring includes an shed unit 1 and a hoop. The shed unit 1 is in the shape of a semicircular ring. Two shed units 1 are radially spliced ​​together to form an annular shed with a mounting hole 8 at the center. One end of the shed unit 1 extends axially along the mounting hole 8 to form a fixed tube unit 5. The two shed units 1 are spliced ​​together corresponding to the fixed tube unit 5 to form a cylindrical fixed tube 7. The fixed tube 7 is connected to the mounting hole 8. A raised positioning block 6 is provided on the outer periphery of the fixed tube unit 5. The fixed tube unit 5 and the shed unit 1 are integrally cast. The inner ring of the hoop is provided with a clamping groove, which can be detachably sleeved on the outside of the fixed tube 7. The positioning block 6 extends into the clamping groove. The hoop constrains the fixed tube 7 to maintain the relative positions of the two shed units 1.

[0026] In this embodiment, the end face of the umbrella skirt unit 1 is a smooth fan-shaped surface, and the joint surfaces 2 of the two umbrella skirt units 1 are in contact with each other. After the complex ear plate 3 with holes is eliminated, the casting mold design of the umbrella skirt unit 1 is simpler, the fluidity of the metal liquid is improved, the defect rate such as casting holes is significantly reduced, and the production yield is improved; the one-piece molding structure is simplified, and the machining steps such as opening the ear plate after casting are reduced, thereby improving the production efficiency and reducing the cost.

[0027] In the connection method between the fixed tube 7 and the clamp, the positioning block 6 fits into the slot, and the positioning block 6 and the slot are in surface contact. At the same time, the clamp's restraining force is applied to the higher-strength fixed tube unit 5. Compared with the point contact of traditional ear plates, the stress distribution is more uniform, avoiding the notch effect. During installation, there is no need to apply a high tightening torque to the ear plates. During operation, the clamp's restraint can resist external forces such as wind loads, reducing the risk of breakage and falling off, and extending the service life of the grading ring. The positioning block 6 cooperates with the slot to ensure the installation accuracy of the anti-bird grading ring, avoid the position deviation of the shed due to connection failure, ensure the stability of the anti-bird droppings shielding function and the electric field equalization effect, and reduce bird-induced tripping and insulator corona loss.

[0028] The clamp is a detachable structure. When the grading ring needs to be repaired or replaced, there is no need to dismantle the insulator string as a whole. The shed unit 1 can be disassembled by simply loosening the clamp, which reduces maintenance costs and improves adaptability.

[0029] In this embodiment, the failure problem of traditional bird-proof equalizing rings caused by casting defects is solved by decomposing the structure and replacing mechanical connections. While ensuring the bird-proofing and electric field uniformization functions, multiple optimizations of production efficiency, structural reliability and maintenance convenience are achieved, providing more reliable protection for the safe operation of power transmission lines.

[0030] In this embodiment, the bolt hole structure is replaced with a positioning block 6. Positioning block 6 serves only as an axial limiter for the clamp and is not a primary load-bearing component. The primary load-bearing function remains the radial constraint between the fixing tube 7 and the clamp. Positioning block 6 is a simple, platform-shaped raised structure. Compared to the original perforated lug plate 3, its shape is regular, without holes, and located in a single edge area, rather than at the intersection of multiple structures. The elimination of the bolt hole significantly improves the fluidity of the molten metal in this area during casting, avoiding the problem of insufficient molten metal filling caused by the hole structure.

[0031] The positioning block 6 does not participate in the main force bearing, but only plays an auxiliary positioning role. Even if there are slight casting defects, such as surface unevenness, sand inclusions, etc., it will not affect the overall mechanical properties of the composite insulator bird-proof equalizing ring. The main restraining force of the clamp still comes from the positioning block 6 on the periphery of the fixed tube 7 and the card slot. This structure is a surface contact force, with uniform stress distribution, avoiding stress concentration at the bolt hole of the traditional ear plate. The axial positioning of the clamp by the positioning block 6 can reduce the position deviation during installation, ensure the coaxiality of the equalizing ring and the insulator, and improve the accuracy of bird-proof shielding. During operation, the clamp is limited by the positioning block 6, which can resist the axial displacement caused by wind load, reduce the risk of the equalizing ring falling off, and extend the service life.

[0032] Compared with ordinary slot-type positioning structures, during casting, the slot-type structure requires the molten metal to fill the concave area. The flow resistance of the molten metal in the concave area is large, which can easily lead to bubble retention and insufficient filling, resulting in holes or shrinkage defects. The concave structure is also prone to wear during demolding, affecting the precision of the casting. In addition, the slot-type structure requires an inner groove to be opened on the outer periphery of the fixed tube 7, which is equivalent to forming a notch on the tube wall. The effective wall thickness of the fixed tube 7 is thinned. When bearing the restraining force of the clamp, the stress is concentrated on the edge of the notch, reducing the structural strength. If the slot-type structure is close to the root of the fixed tube 7, it may weaken the connection strength between the fixed tube 7 and the umbrella skirt unit 1, increasing the risk of fracture. In this embodiment, a raised positioning block 6 is used. The design of the convex molding mold is simple, and there is no need for a core-pulling structure. This avoids the problem of difficult molding of the concave structure and improves the surface quality of the casting. The cooling and shrinkage of the molten metal at the positioning block 6 are uniform, which prioritizes the strength of the force-bearing structure at the position of the fixed tube 7 and reduces the adverse effects on the strength of the fixed tube 7. The positioning block 6 protrudes from the outer periphery of the fixed tube 7, eliminating the need for grooves in the tube wall. The fixed tube 7 maintains a full wall thickness, and the load-bearing capacity is not affected. The clamping force is transmitted to the fixed tube 7 through the positioning block 6, and the force path is more direct. like Figure 2 As shown, the fixing tube 7 and the mounting hole 8 are coaxially arranged, with the inner walls butted together to form a stepped hole. The inner diameter of the mounting hole 8 is larger than that of the fixing tube 7, forming a stepped structure. If the inner diameter of the mounting hole 8 is 50mm, the inner diameter of the fixing tube 7 can be designed to be 40mm, with an axial width of 5-10mm on the step surface. The stepped surface provides axial positioning for the insertion of the insulator, ensuring the coaxiality of the grading ring and the insulator, and preventing the shed from shifting and affecting the bird protection effect. The stepped hole structure can buffer the assembly stress between the insulator and the fixing tube 7, reducing deformation of the fixing tube 7 due to radial extrusion. By adjusting the stepped hole diameter, insulators with different outer diameters can be compatible, improving the versatility of the grading ring.

[0033] The inner and outer generatrixes of the fixed tube 7 are parallel to the axis, and the wall thickness is uniform. In this embodiment, the wall thickness is 5-8 mm, and there is no variable cross-section structure. This uniform wall thickness prevents uneven cooling of the molten metal due to sudden changes in cross-section during flow, reduces defects such as shrinkage cavities and cracks, and improves casting yield. The uniform wall thickness ensures consistent circumferential strength of the fixed tube 7, eliminating weak points when subjected to the restraining force of the clamp and enhancing wind fatigue resistance. The standardized cylindrical structure allows for the use of a common mold, reducing production costs and accommodating the mass production of equalizing rings of different sizes.

[0034] At least one positioning block 6 is provided on the outer periphery of each fixed cylinder unit 5, and multiple positioning blocks can also be provided as needed. The clamp cooperates with at least one positioning block 6 on each fixed cylinder unit 5 of the same fixed cylinder 7. In the actual working room, the clamp slot can be embedded with multiple positioning blocks 6 at the same time to form multi-point constraints.

[0035] The positioning block 6 of the same clamp is located at the same axial position on the fixed tube 7. The positioning block 6 is inserted into the slot to form an interlocking fit, thereby fixing the relative axial position of the clamp and the fixed tube 7. The slot is an annular groove. When the clamp is unlocked, the clamp can rotate around the fixed tube 7 under the guidance of the positioning block 6 to adjust the circumferential position.

[0036] The positioning block 6 is engaged with the card slot at the same axial position to limit the up and down movement of the clamp, ensuring that the pressure equalizing ring does not fall off after installation; when the clamp is not locked, it can rotate around the fixed tube 7, and the annular position is adjusted by the positioning block 6 to facilitate the alignment of the direction of the bird-proof umbrella skirt during on-site installation.

[0037] The positioning block 6 is an annular protrusion. Along the radial direction of the fixed tube 7, the positioning block 6 is provided with a taper to guide the cooperation between the slot and the positioning block 6. The positioning block 6 is tapered along the radial direction (such as a taper of 1:10). The slot entrance matches the tapered profile and can be automatically centered during installation, reducing the difficulty of assembly and avoiding structural damage caused by brute force knocking.

[0038] The clamp is composed of two hinged semicircular ring clamps, connected at the other end by bolts or other fasteners. An annular groove is provided on the inside of the clamp, which connects to form a complete ring when assembled. The hinged structure allows the clamp to be opened and closed, eliminating the need to insert it from the end of the insulator, making it suitable for on-site installation of already installed insulator strings. Disassembly requires only loosening the fasteners to disassemble the clamp, facilitating inspection or replacement and improving maintenance efficiency. The annular groove makes surface contact with the positioning block 6, ensuring uniform circumferential restraint when the clamp is tightened, preventing deformation of the fixing barrel 7 due to local overload.

[0039] The clamps are each provided with a slot. When the two clamps are joined, they form a ring-shaped clamp. The corresponding slots of the two clamps are connected. The end faces of the shed units 1 are smooth, sector-shaped surfaces. The mating surfaces 2 of the two shed units 1 align with each other, forming a tight, complete ring-shaped shed. The tightly joined surfaces 2 prevent bird droppings from leaking through gaps onto the insulator surface, ensuring effective bird protection. The smooth surface reduces electric field distortion points and, in conjunction with the electric field equalization function of the grading ring, reduces corona losses. The sector-shaped surface mold is simple to manufacture, and the flatness of the mating surfaces 2 is easily controlled, improving assembly precision.

[0040] In this embodiment, stress concentration points of the traditional structure are eliminated to adapt to complex working conditions such as long-term vibration and wind load of the transmission line; from a process perspective, simple geometric structures are used to replace complex castings, which meets the needs of industrial mass production; the detachable clamp and positioning adjustment function reduce the difficulty of high-altitude operations, improve the efficiency of power grid maintenance, and provide long-term technical support for bird damage prevention and control.

[0041] It should be noted that in this embodiment, the clamping force is transmitted to the fixed tube 7 via the positioning block 6, shifting the primary force-bearing area from the edge lugs to the fixed tube 7 on the central axis. The fixed tube 7 is a cylindrical structure with uniform wall thickness, axially coaxial with the insulator. External forces such as wind loads are transmitted in the form of axial pressure / tension, avoiding bending moment concentration. This results in a near-uniform force state at the fixed tube 7. During installation, the clamping force is evenly distributed along the circumference of the fixed tube 7, preventing localized compression and deformation when the original lug bolts are tightened.

[0042] In this embodiment, the shed unit 1 of the composite insulator bird-proof grading ring is cast with metal (such as aluminum alloy) and cooperates with the non-metallic material (such as silicone rubber) of the composite insulator to achieve bird-proofing and electric field uniformity functions.

[0043] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A composite insulator bird-proof grading ring, characterized in that: include: The shed unit is in the shape of a semicircular ring. Two shed units are radially spliced ​​together to form an annular shed with a mounting hole at its center. One end of the shed unit extends axially along the mounting hole to form a fixed tube unit. The two shed units correspond to the fixed tube unit and are spliced ​​together to form a cylindrical fixed tube. The fixed tube is connected to the mounting hole, and a raised positioning block is provided on the outer periphery of the fixed tube unit. The inner ring of the hoop is provided with a slot, which can be detachably sleeved on the outside of the fixed tube. The positioning block is inserted into the slot. The hoop imposes constraints on the fixed tube to maintain the relative positions of the two umbrella skirt units.

2. The composite insulator bird-proof grading ring according to claim 1, characterized in that: The fixing cylinder and the mounting hole are coaxially distributed, and the inner wall of the mounting hole and the inner wall of the fixing cylinder are coaxially butted together to form a stepped hole. The inner wall diameter of the mounting hole is larger than the inner wall diameter of the fixing cylinder.

3. The composite insulator bird-proof grading ring according to claim 2, characterized in that: The inner wall generatrix and the outer wall generatrix of the fixed cylinder are both parallel to the axis of the fixed cylinder, and the fixed cylinder body is a cylindrical structure with uniform wall thickness.

4. The composite insulator bird-proof grading ring according to claim 1, characterized in that: At least one positioning block is respectively provided on the outer circumference of each of the fixing cylinder units, and the clamp cooperates with at least one positioning block on each fixing cylinder unit of the same fixing cylinder.

5. The composite insulator bird-proof grading ring according to claim 4, characterized in that: The positioning block matched with the same clamp is located at the same axial position of the fixed tube, and the positioning block is inserted into the card slot to form an engagement to fix the axial relative position of the clamp and the fixed tube.

6. The composite insulator bird-proof grading ring according to claim 4 or 5, characterized in that: The clamping groove is an annular groove. When the clamping hoop is not locked, the clamping hoop can rotate around the fixing tube under the guidance of the positioning block to adjust the circumferential position.

7. The composite insulator bird-proof grading ring according to claim 6, characterized in that: The positioning block is an annular protrusion. Along the radial direction of the fixed cylinder, the positioning block is provided with a taper to form a guide for the cooperation between the clamping slot and the positioning block.

8. The composite insulator bird-proof grading ring according to claim 1, characterized in that: The clamp comprises two semicircular ring-shaped clamps hinged at one end, and the other ends of the two clamps are detachably connected by fasteners.

9. The composite insulator bird-proof grading ring according to claim 8, characterized in that: The clamps are respectively provided with clamping grooves, and the two clamps are clamped together to form an annular clamp, and the corresponding clamping grooves of the two clamps after being clamped are connected.

10. The composite insulator bird-proof grading ring according to claim 1, characterized in that: The end surface of the umbrella skirt unit is a smooth fan-shaped surface, and the joint surfaces of the two umbrella skirt units are in contact with each other.

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