A porcelain insulator facilitating monomer replacement

Abstract

The present application relates to porcelain insulator technical field, especially be a kind of porcelain insulator convenient to single body replacement, including umbrella skirt body, the upper connecting unit fixed in the top of umbrella skirt body and the lower connecting unit fixed in the bottom of umbrella skirt body, the upper connecting unit includes fixed cylinder and the conical cylinder of movable sleeve in the outside of fixed cylinder, the top of conical cylinder is fixed with arc-shaped lug, the bottom surface of arc-shaped lug is equipped with toothed plate.The present application is through the cooperation of arc-shaped lug and the inclined plane of lock block and the meshing structure of toothed plate and tooth groove, realizes automatic locking in insertion process, only needs to press and lift T-shaped rod by hand when disassembling, can complete unlocking, whole dismounting process does not need any tool, greatly reduce the labor intensity of operator, dismounting process does not need any knocking operation, reduces wear, deformation, damage problem, improves the connection reliability of long-term operation of transmission line.

Description

Technical Field

[0001] This invention relates to the field of porcelain insulator technology, specifically to a porcelain insulator that is easy to replace individually. Background Technology

[0002] Suspension porcelain insulator strings are indispensable insulation support elements in overhead transmission lines. Traditional suspension porcelain insulators employ an axial series locking structure of "ball head + cup mouth + M-pin": the steel ball head of the upper insulator is inserted into the steel cap cup mouth of the lower insulator, and axial locking is achieved through laterally inserted M-pins. While this structure provides reliable load-bearing capacity, it presents the following problems when replacing a single damaged insulator:

[0003] M-pins are exposed to the outdoor environment for a long time and are prone to rust and jamming. They can only be pulled out by repeatedly hitting them with a special punch and hammer. The operating space is limited and the porcelain parts are easily damaged. Moreover, the repeated hitting with the punch and hammer can wear down the ball head of the previous insulator, which can lead to loose connections when installing new insulators. Therefore, a porcelain insulator that is easy to replace individually is needed to improve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a ceramic insulator that is easy to replace individual units, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A porcelain insulator that is easy to replace individual units includes a skirt body, an upper connecting unit fixed to the top of the skirt body, and a lower connecting unit fixed to the bottom of the skirt body.

[0007] The upper connecting unit includes a fixed cylinder and a conical cylinder movably sleeved on the outside of the fixed cylinder. The top of the conical cylinder is fixed with an arc-shaped protrusion, and the bottom surface of the arc-shaped protrusion is provided with a toothed plate.

[0008] The lower connecting unit includes a stepped rod, which has an axially penetrating through hole. The inner wall of the through hole has several radial rectangular grooves along the circumference, and each rectangular groove has a circular hole penetrating the side wall of the stepped rod on one side.

[0009] A T-shaped rod is inserted through the circular hole. The thin end of the T-shaped rod extends into the rectangular groove and is fixedly connected to a locking block. The bottom surface of the locking block is arc-shaped, and the top surface is provided with toothed grooves. A spring is sleeved on the outer side of the thin end of the T-shaped rod. The two ends of the spring abut against the locking block and the inner wall of the rectangular groove, respectively.

[0010] When adjacent insulators are connected, the arc-shaped protrusion presses against the arc-shaped locking block, causing the locking block to retract. After passing the arc-shaped surface, the locking block pops out and the tooth groove engages with the tooth plate to lock.

[0011] As a preferred embodiment of the present invention, the conical cylinder is fitted with a fixed cylinder with a clearance and can slide along the axial direction of the fixed cylinder. A storage groove is provided on the top edge of the conical cylinder. The number of storage grooves is the same as the number of toothed plates. Through the axial sliding capability of the conical cylinder and the cooperation of the storage grooves, automatic interference unlocking and toothed plate storage are realized during the disassembly process, which significantly reduces the unlocking resistance.

[0012] As a preferred embodiment of the present invention, the toothed plate is provided with four pieces, which are evenly distributed around the bottom surface of the arc-shaped protrusion. The four toothed plates are evenly distributed at 90° intervals around the circumference, which can provide a sufficient number of meshing points to ensure that at least two toothed plates are in effective meshing with the tooth groove of the locking block at any circumferential angle, thereby reliably preventing relative rotation of the insulator unit during use.

[0013] As a preferred embodiment of the present invention, there are four rectangular slots, which are evenly distributed circumferentially along the inner wall of the through hole. Each rectangular slot corresponds to a locking block and a T-shaped rod. Through the four circumferentially distributed locking blocks, the circumferentially balanced distribution of locking force is achieved, and redundant locking is provided.

[0014] As a preferred embodiment of the present invention, the top surface of the locking block is provided with a plurality of parallel tooth grooves along its length direction, and the tooth plate is a downward protruding strip tooth. The tooth plate and the tooth grooves mesh one-to-one. Through the multi-tooth meshing structure, the locking stability and anti-vibration and anti-loosening ability are significantly improved.

[0015] As a preferred embodiment of the present invention, a protective circular shell is fixed to the outside of the stepped rod, and a stepped cavity is provided inside the protective circular shell. There is a gap between the stepped cavity and the thick end of the T-shaped rod. Through the design of the protective circular shell and the stepped cavity inside, the T-shaped rod is provided with a space for movement, while realizing the physical protection of the internal precision components.

[0016] As a preferred embodiment of the present invention, the bottom of the protective circular shell is provided with an annular mounting groove, and a plurality of compression springs are fixed in an annular shape in the mounting groove. The bottom of the compression springs is fixed together with an annular plate. Through the combination of the multiple annularly distributed compression springs and the annular plate, an adaptive elastic seal is formed, which can automatically compensate for manufacturing tolerances and thermal expansion and contraction, and achieve a continuous and reliable compression seal.

[0017] As a preferred embodiment of the present invention, the annular plate is fitted with the mounting groove with a clearance, and a rubber strip is fixed on the lower surface of the annular plate. Through the clearance fit between the annular plate and the mounting groove and the design of the rubber strip, floating centering and flexible sealing are achieved, further improving the adaptability and durability of the seal.

[0018] As a preferred embodiment of the present invention, a support ring is fixed to the outer wall of the umbrella skirt body, and an annular groove is provided on the upper surface of the support ring. After the adjacent insulators are connected, the protective circular shell is placed on the outside of the upper connecting unit, and the annular plate is pressed against the annular groove under the action of the compression spring. Through the cooperation of the protective circular shell and the support ring, a complete multi-sealed cavity is formed, which effectively isolates external rainwater, dirt and salt spray, and significantly extends the service life of the connection structure.

[0019] As a preferred embodiment of the present invention, the tapered cylinder and the arc-shaped protrusion have the same maximum diameter. The equal diameter design of the tapered cylinder and the arc-shaped protrusion ensures that the lock block can smoothly transition during the unlocking process.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention achieves automatic locking during insertion through the beveled engagement of the arc-shaped protrusion and the locking block, as well as the meshing structure of the toothed plate and the toothed groove. During disassembly, unlocking can be completed simply by pressing and lifting the T-shaped rod by hand. The entire disassembly and assembly process requires no tools, greatly reducing the labor intensity of operators. The disassembly and assembly process does not require any hammering, reducing wear, deformation, and damage problems, and improving the connection reliability of transmission lines in long-term operation.

[0022] In this invention, the planar contact between the top surface of the locking block and the bottom surface of the arc-shaped protrusion provides the main axial tensile strength; and the multi-point meshing locking structure with four sets of toothed plates and four sets of locking blocks arranged circumferentially and symmetrically can evenly distribute the mechanical loads generated by wind pressure, icing, and vibration of the conductor to each locking point, avoiding stress concentration at a single point. At the same time, the toothed plates and tooth grooves form a multi-tooth meshing limit, which can effectively restrict the axial movement and circumferential rotation of the insulator, and has the ability to resist vibration, loosening, and sway, thereby improving the overall load-bearing stability and operational safety of the insulator string.

[0023] This invention features a protective circular shell on the outside of the stepped rod, and an elastic sealing structure consisting of a compression spring, an annular plate, and a rubber strip at its bottom. This structure, in conjunction with the support ring on the umbrella skirt body, forms a closed protective cavity, effectively preventing corrosive media such as rainwater, dust, and salt spray from entering the connection area. This protects precision components such as the locking block, spring, and toothed plate, and improves the environmental adaptability and service life of the locking mechanism. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the assembly structure of the present invention;

[0026] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0027] Figure 4 For the present invention Figure 3 A magnified view of the structure at point A in the middle;

[0028] Figure 5 This is a schematic diagram of the installation structure of the locking block of the present invention;

[0029] Figure 6 This is a schematic diagram of the upper connecting unit structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the conical cylinder of the present invention;

[0031] Figure 8 This is a schematic diagram of the installation structure of the upper connecting unit and the lower connecting unit of the present invention;

[0032] Figure 9 This is a schematic diagram of the unfolded structure of the protective circular shell of the present invention;

[0033] Figure 10 This is a cross-sectional view of the connection between the protective circular shell and the stepped rod of the present invention.

[0034] In the diagram: 1. Umbrella skirt body; 2. Upper connecting unit; 21. Fixed cylinder; 22. Conical cylinder; 221. Storage groove; 23. Arc-shaped protrusion; 231. Toothed plate; 3. Lower connecting unit; 31. Stepped rod; 311. Through hole; 312. Rectangular groove; 313. Round hole; 32. T-shaped rod; 33. Locking block; 331. Toothed groove; 34. Spring; 4. Protective round shell; 41. Stepped cavity; 42. Mounting groove; 43. Compression spring; 44. Annular plate; 45. Rubber strip; 5. Support ring; 51. Annular slot. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] To facilitate understanding of the present invention, a more comprehensive description of the invention will be given below with reference to the accompanying drawings, and several embodiments of the invention will be provided. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.

[0037] Example 1, please refer to Figure 1-10 The present invention provides a technical solution:

[0038] A ceramic insulator that is easy to replace individually includes a skirt body 1, an upper connecting unit 2 fixed to the top of the skirt body 1, and a lower connecting unit 3 fixed to the bottom of the skirt body 1.

[0039] The umbrella skirt body 1 is the core insulating body of the device. It is made of aluminum porcelain material and is integrally sintered at high temperature. The umbrella skirt body 1 as a whole serves as a high-voltage insulation and isolation structure, effectively isolating the high-voltage conductor from the grounding tower. At the same time, the umbrella-shaped extension structure greatly extends the creepage distance along the surface, preventing surface flashover discharge in rain, snow, fog and haze, and ensuring the electrical safety of the transmission line.

[0040] The upper connecting unit 2 includes a fixed cylinder 21 and a conical cylinder 22 movably sleeved on the outside of the fixed cylinder 21, which undertakes the functions of docking, bearing and unlocking adjustment of adjacent insulators.

[0041] The fixed cylinder 21 is made of 45# high-quality carbon structural steel, which has high strength, good toughness, strong compressive and deformation resistance, and excellent tensile and shear mechanical properties. The lower end of the fixed cylinder 21 is fixed to the top center of the umbrella skirt body 1 with 500# high-strength cement adhesive. The adhesive bonding surface has high density and high bonding strength, which can stably transmit axial tensile force. It is not easy to delamination, loosening or displacement under long-term load, thus ensuring the overall structural stability of the upper connecting unit 2 and the ceramic body.

[0042] The conical cylinder 22 is a thin-walled conical sleeve structure, integrally stamped from hot-dip galvanized steel sheet. It features high forming precision, good structural consistency, and a uniform galvanized layer, providing excellent outdoor rust and corrosion resistance. The inner diameter of the conical cylinder 22 is 0.3mm larger than the outer diameter of the fixed cylinder 21, creating a high-precision, micro-clear clearance fit. This ensures that the conical cylinder 22 can slide freely and smoothly along the axial direction of the fixed cylinder 21 without jamming or interference, while also limiting radial wobble, guaranteeing sliding alignment accuracy and structural stability.

[0043] The top edge of the conical cylinder 22 has four evenly spaced storage slots 221, which are used to avoid the toothed plate 231 below during unlocking operations, achieving structural error prevention and completely eliminating mechanical interference during the unlocking process, ensuring smooth and efficient disassembly and assembly operations. The top of the conical cylinder 22 is integrally welded with an arc-shaped protrusion 23. The arc-shaped protrusion 23 is made of spherical crown-shaped cast steel, which has strong integral rigidity and high load-bearing capacity. The surface is hot-dip galvanized for corrosion protection and resistance to outdoor environmental corrosion. The maximum diameter of the arc-shaped protrusion 23 is consistent with the maximum diameter of the conical cylinder 22, so that the overall outer contour is smoothly transitioned, without stress concentration protrusions, reducing wind resistance and dead corners for dirt accumulation.

[0044] Four toothed plates 231 are evenly welded circumferentially to the bottom surface of the arc-shaped protrusion 23. The toothed plates 231 are carburized and quenched, resulting in high surface hardness, strong wear resistance, resistance to extrusion, and resistance to tooth breakage and wear. The four toothed plates 231 are evenly distributed circumferentially, enabling multi-point symmetrical meshing and locking, uniform force distribution, and stable load bearing, effectively improving the overall locking strength and vibration resistance.

[0045] The lower connecting unit 3 is the core functional structure for insulator series locking, playing a crucial role in docking guidance, elastic locking, and anti-disengagement limiting. The stepped rod 31 is made of QT500-7 ductile iron, a material that combines high strength and high toughness, exhibiting high tensile strength, impact resistance, fatigue resistance, and resistance to brittle fracture, making it suitable for long-term vibration, icing, and alternating wind pressure loads on transmission lines. The smaller diameter section of the stepped rod 31 is firmly fixed to the center of the bottom of the umbrella skirt body 1 using high-grade cement adhesive, ensuring a secure connection and strong structural integrity. The larger diameter section faces downwards, providing ample space for the locking mechanism installation.

[0046] A through hole 311 is provided at the center of the stepped rod 31, which is used for the vertical alignment and insertion of the arc-shaped protrusion 23 of the upper insulator to achieve rapid docking and positioning. Four rectangular slots 312 are evenly opened circumferentially on the inner wall of the through hole 311, providing a regular and stable radial extension and retraction track for the locking block 33, ensuring that the extension and retraction of the locking block 33 is smooth, without deviation or jamming. A circular hole 313 penetrating the side wall of the stepped rod 31 is provided at the bottom of each rectangular slot 312, which is used to install the T-shaped rod 32 to achieve precise guidance and assembly of the locking block 33.

[0047] The T-shaped rod 32 is made of 304 stainless steel, which is rust-proof, corrosion-resistant, has high structural strength, and is not easily deformed under long-term stress, making it suitable for outdoor humid, dirty, and salt spray environments. The narrow end of the T-shaped rod 32 extends into the rectangular groove 312 and is fixed to the locking block 33 by a threaded locking method, which ensures reliable connection and convenient assembly and disassembly, and guarantees that the locking block 33 and the T-shaped rod 32 move synchronously without loosening or shifting.

[0048] The locking block 33 is precision cast from ZCuSn10P1 tin bronze, a material with a low coefficient of friction, excellent wear resistance, corrosion resistance, and good self-lubrication, making it suitable for long-term reciprocating sliding meshing conditions. The bottom surface of the locking block 33 features a standard R15 arc-shaped guide surface, which allows for smooth compression and mating with the curved surface of the arc-shaped protrusion 23 during assembly, achieving automatic radial retraction and avoidance without manual alignment. This results in high assembly tolerance and smooth docking. The top surface of the locking block 33 features multiple parallel toothed grooves 331, which form a dense multi-tooth engagement with the upper toothed plate 231. This provides a large meshing area, high limiting strength, and strong anti-slip capability, effectively preventing loosening of the connection and rotational misalignment caused by long-term vibration.

[0049] A stainless steel compression spring 34 is fitted onto the outer side of the narrow end of the T-shaped rod 32. The two ends of the spring 34 are respectively fixed to the back of the locking block 33 and the inner wall of the rectangular groove 312, ensuring a secure fixation that prevents it from easily falling off. The stainless steel spring has the advantages of fatigue resistance, corrosion resistance, and resistance to rust failure. Under normal conditions, it can continuously provide a stable pushing force to ensure that the locking block 33 automatically pops out and engages for locking. During docking and pressing, it can smoothly compress and retract, achieving adaptive avoidance. The structure has extremely high sensitivity and reliability.

[0050] A protective circular shell 4 is fixed to the lower end face of the large-diameter section of the stepped rod 31. The protective circular shell 4 is made of ADC12 aluminum alloy by die casting, which has high molding precision, high structural strength, light weight, corrosion resistance, and impact resistance, making it suitable for long-term outdoor exposure. The protective circular shell 4 has a stepped cavity 41 inside, which provides sufficient clearance for the telescopic movement of the internal T-shaped rod 32 and locking block 33, completely avoiding structural interference and ensuring that the locking mechanism operates flexibly and reliably.

[0051] The bottom of the protective circular shell 4 has an annular mounting groove 42, inside which six sets of compression springs 43 are evenly embedded in a ring. The bottom of the six sets of compression springs 43 are jointly fixed to the annular plate 44. The annular plate 44 is injection molded from POM (polyoxymethylene) material, which is lightweight, wear-resistant, aging-resistant, highly tough, and not easily deformed, possessing excellent outdoor weather resistance. A silicone rubber strip 45 is fixed to the lower surface of the annular plate 44. The silicone rubber material is resistant to high and low temperatures, aging-resistant, has lasting elasticity, and excellent sealing performance.

[0052] The outer wall of the umbrella skirt body 1 is fixed with a ZL102 aluminum alloy support ring 5. The support ring 5 is high in strength, corrosion-resistant and not easily deformed. An annular groove 51 is opened on its upper surface to provide a precise alignment and sealing reference for the sealing structure.

[0053] This invention utilizes a protective circular shell 4 to completely enclose the internal locking mechanism, forming an adaptive closed-loop sealing system with a compression spring 43, an annular plate 44, and a silicone rubber strip 45. Utilizing the elastic compensation characteristics of the compression spring 43, it automatically compensates for assembly tolerance gaps, equipment vibration gaps, and mating gaps caused by long-term wear. This ensures that the silicone rubber strip 45 is consistently and tightly pressed against the annular groove 51 of the support ring 5, creating an all-weather, fully enclosed, and seamless sealed protective space. This effectively prevents corrosive media such as rainwater, smog, salt spray, industrial dust, and condensation from intruding into the internal locking structure. It completely solves the problems common in traditional exposed locking structures, such as spring corrosion fatigue, lock block dust accumulation and jamming, tooth corrosion and wear, and mechanism failure. This significantly improves the reliability and overall service life of the locking mechanism, allowing the device to be stably adapted to harsh power transmission conditions such as coastal salt spray, heavy industrial pollution, and high humidity and rain, greatly reducing equipment failure rates and maintenance frequency.

[0054] Example 2: Based on Example 1, this example strengthens the protective structure. Unlike Example 1, eight compression springs 43 are evenly arranged in the bottom mounting groove 42 of the protective circular shell 4. The wire diameter of the compression springs 43 is thickened to 0.8 mm and the free length is increased to 12 mm to provide greater clamping force. A double-layer rubber strip 45 is fixed on the lower surface of the annular plate 44. The upper layer is silicone rubber and the lower layer is fluororubber, forming a composite sealing structure. The fluororubber layer directly contacts the annular groove 51, which has better chemical corrosion resistance. The annular groove 51 of the support ring 5 is designed with a dovetail shape to form a self-locking seal with the rubber strip 45. Even under high wind speed (35 m / s) conditions, rainwater cannot penetrate into the interior of the protective circular shell.

[0055] In addition, the inner wall of the stepped cavity 41 of the protective circular shell 4 is coated with a polytetrafluoroethylene (PTFE) coating with a thickness of 0.05 mm to reduce the coefficient of friction when the thick end of the T-shaped rod 32 slides and to prevent jamming caused by salt spray deposition. An O-ring is added at the connection between the stepped rod 31 and the protective circular shell 4, not shown in the figure, to form a double seal.

[0056] The beneficial effects of this embodiment are as follows: through the enhanced elastic seal and anti-corrosion coating, the protection level of the insulator connection part reaches IP67, which can be reliably operated for a long time in continuous immersion or high salt spray environment, and the overall service life is extended to more than 40 years.

[0057] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ceramic insulator that is easy to replace individually, comprising a skirt body (1), an upper connecting unit (2) fixed to the top of the skirt body (1), and a lower connecting unit (3) fixed to the bottom of the skirt body (1), characterized in that: The upper connecting unit (2) includes a fixed cylinder (21) and a conical cylinder (22) movably sleeved on the outside of the fixed cylinder (21). The top of the conical cylinder (22) is fixed with an arc-shaped protrusion (23), and the bottom surface of the arc-shaped protrusion (23) is provided with a toothed plate (231). The lower connecting unit (3) includes a stepped rod (31), the stepped rod (31) is provided with an axially penetrating through hole (311), and the inner wall of the through hole (311) is provided with a plurality of radial rectangular grooves (312) along the circumferential direction, and each rectangular groove (312) is provided with a circular hole (313) penetrating the side wall of the stepped rod (31) on one side. A T-shaped rod (32) is inserted through the circular hole (313). The thin end of the T-shaped rod (32) extends into the rectangular groove (312) and is fixedly connected to a locking block (33). The bottom surface of the locking block (33) is an arc-shaped surface, and the top surface is provided with a toothed groove (331). A spring (34) is sleeved on the outside of the thin end of the T-shaped rod (32). The two ends of the spring (34) abut against the locking block (33) and the inner wall of the rectangular groove (312) respectively. When adjacent insulators are connected, the arc-shaped protrusion (23) presses the arc-shaped surface of the locking block (33) to retract the locking block (33). After passing the arc-shaped surface, the locking block (33) pops out and the tooth groove (331) engages and locks with the tooth plate (231).

2. The porcelain insulator for easy individual replacement according to claim 1, characterized in that: The conical cylinder (22) is fitted with a fixed cylinder (21) with a clearance and can slide along the axial direction of the fixed cylinder (21). The top edge of the conical cylinder (22) is provided with a storage groove (221), and the number of storage grooves (221) is the same as the number of toothed plates (231).

3. A porcelain insulator that is easy to replace individual units according to claim 1, characterized in that: The toothed plate (231) has four pieces, which are evenly distributed around the bottom surface of the arc-shaped protrusion (23).

4. A porcelain insulator that is easy to replace individual units according to claim 1, characterized in that: There are four rectangular slots (312), which are evenly distributed along the inner wall of the through hole (311). Each rectangular slot (312) corresponds to a locking block (33) and a T-shaped rod (32).

5. A porcelain insulator that is easy to replace individual units according to claim 4, characterized in that: The top surface of the locking block (33) has multiple parallel tooth grooves (331) along its length direction. The tooth plate (231) is a downward protruding strip tooth, and the tooth plate (231) and the tooth groove (331) mesh one-to-one.

6. A porcelain insulator that is easy to replace individual units according to claim 1, characterized in that: The stepped rod (31) is fixed with a protective round shell (4) on the outside. The protective round shell (4) has a stepped cavity (41) inside. There is a gap between the stepped cavity (41) and the thick end of the T-shaped rod (32).

7. A porcelain insulator that is easy to replace individual units according to claim 6, characterized in that: The bottom of the protective circular shell (4) is provided with an annular mounting groove (42), and several compression springs (43) are fixed in the mounting groove (42) in an annular shape. The bottom of the compression springs (43) is fixed with an annular plate (44).

8. A porcelain insulator that is easy to replace individual units according to claim 7, characterized in that: The annular plate (44) is fitted with the mounting groove (42) with a clearance, and a rubber strip (45) is fixed on the lower surface of the annular plate (44).

9. A porcelain insulator that is easy to replace individual units according to claim 6, characterized in that: The outer wall of the umbrella skirt body (1) is fixed with a support ring (5). The upper surface of the support ring (5) is provided with an annular groove (51). After the adjacent insulators are connected, the protective round shell (4) covers the outside of the upper connecting unit (2), and the annular plate (44) is pressed against the annular groove (51) under the action of the compression spring (43).

10. A porcelain insulator that is easy to replace individual units according to claim 1, characterized in that: The conical cylinder (22) has the same maximum diameter as the arc-shaped protrusion (23).

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