Post insulator and method for preparing the same

Abstract

The present application specifically discloses a post insulator and a method for preparing the same, wherein the post insulator comprises a post insulator body and an insulating sheath, wherein the post insulator body comprises a first end for connecting to an iron tower and a free end opposite to the first end; the insulating sheath is wrapped around the free end. By wrapping the free end with the insulating sheath, it is possible to avoid the use of a hardware structure at the free end, thereby avoiding the phenomenon that the metal parts at the free end may generate a floating potential and partial discharge in a high-voltage field, and preventing the rapid aging of the product or even insulation failure. In addition, wrapping the free end with the insulating sheath can avoid friction with the wire and damage to the wire.

Description

Technical Field

[0001] The present application relates to the technical field of power transmission insulation equipment, and in particular to a post insulator and a method for preparing the same. Background Art

[0002] At present, wind-proof insulators mainly use line composite insulators with smaller specifications, and line composite insulators need to be connected to the conductors, so the wind-proof insulators must be installed and modified without power outage. At the same time, under extreme typhoon conditions, due to specification limitations, the line composite insulators may have a large wind deviation angle, resulting in excessive deflection or breakage of the conductor after it acts on it. In addition, the high-voltage end of the existing wind-proof insulators uses a hardware structure. The metal parts at the high-voltage end may produce floating potential and partial discharge in the high-voltage field strength, resulting in rapid aging of the product or even insulation failure. In addition, the metal parts at the high-voltage end of the existing wind-proof insulators are at risk of friction with the conductors and damage to the conductors. Summary of the invention

[0003] The present application provides a post insulator and a preparation method thereof, which can solve the problem that a suspended potential and partial discharge may occur at the high-voltage end of an existing wind-proof deflection insulator.

[0004] To solve the above technical problems, a technical solution adopted in the present application is to provide a post insulator, including: a post insulator body, including a first end for connecting to an iron tower and a free end opposite to the first end; an insulating sheath wrapped around the free end.

[0005] According to one embodiment of the present application, the insulating sheath is cup-shaped, and the insulating sheath is buckled at the free end, which has a simple structure and is easy to install.

[0006] According to one embodiment of the present application, the post insulator body includes a core rod and an insulating shed wrapped around the core rod, the end of the core rod extending out of the insulating shed is a free end, the insulating sheath is buckled outside the core rod and seamlessly connected to the insulating shed on the outside of the post insulator body, thereby ensuring the sealing of the connection and preventing the insulation performance from being reduced due to the penetration of water vapor.

[0007] According to one embodiment of the present application, the outer wall of the open end of the insulating sheath has an inclined surface inclined toward the post insulator body, and a connecting groove is formed between the inclined surface and the end surface of the insulating shed.

[0008] According to one embodiment of the present application, the connection groove is filled with high temperature vulcanized silicone rubber.

[0009] According to one embodiment of the present application, a connecting layer is provided between the insulating sheath and the post insulator body, and the connecting layer is respectively adhered to the insulating sheath and the post insulator body.

[0010] According to one embodiment of the present application, the insulating sheath is made of high-temperature vulcanized silicone rubber, which has excellent aging resistance, and the connecting layer is made of room-temperature vulcanized silicone rubber, which is easy to operate and has good bonding properties.

[0011] According to one embodiment of the present application, the first end is connected to an end fitting for connecting to the iron tower, and the end fitting includes: a sleeve, which is sleeved and fixed on the first end; a flat plate, one end of which is provided with a U-shaped groove matching the end of the sleeve, and the flat plate is fixed to the end of the sleeve by clamping the U-shaped groove; a reinforcing rib, which is located in the space formed by the surface of the flat plate and the end face of the sleeve, and one side of the reinforcing rib is fixedly arranged on the surface of the flat plate, and the other side is fixedly arranged on the end face of the sleeve.

[0012] In order to solve the above technical problems, another technical solution adopted in the present application is to provide a method for preparing a post insulator, which includes the following steps: forming a cup-shaped insulating sheath, the insulating sheath matching the free end of the post insulator body; coating the room temperature vulcanized silicone rubber on the inner wall of the insulating sheath; buckling the insulating sheath coated with the room temperature vulcanized silicone rubber outside the free end, and waiting for the room temperature vulcanized silicone rubber to cure; the outer wall of the open end of the insulating sheath has an inwardly inclined inclined surface, and a connecting groove is formed between the inclined surface and the end face of the insulating shed outside the post insulator, and the connecting groove is filled with mixed rubber; the mixed rubber in the connecting groove is heated and pressurized to cure to form high temperature vulcanized silicone rubber, thereby preparing the post insulator.

[0013] According to one embodiment of the present application, the high temperature vulcanized silicone rubber at the connection groove is polished after being cured.

[0014] The beneficial effect of the present application is that, different from the prior art, by using an insulating sheath to wrap the free end, the free end can be prevented from using a hardware structure, thereby avoiding the phenomenon that the metal parts of the free end in the high-voltage field may generate a floating potential and partial discharge, and preventing the rapid aging of the product or even insulation failure. In addition, if the free end of the post insulator body uses a metal part, there is a risk of friction with the wire and damage to the wire. The present application uses an insulating sheath to wrap the free end, which can avoid the friction with the wire and damage to the wire. In addition, the present application uses a post insulator to replace the traditional line insulator as a wind deflection insulator. The diameter of the traditional line insulator is relatively small and cannot withstand large bending resistance. It needs to be directly connected to the wire to block the wind deflection. When the wind deflection angle is too large, the wire may cause excessive deflection or breakage after acting on the line insulator. When the post insulator is used as a wind deflection insulator, due to the large diameter of the post insulator and good bending resistance, it does not need to be directly connected to the wire, so that when the power grid is energized, it can be directly installed or modified on the iron tower without power outage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a post insulator of the present application;

[0017] Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of a post insulator of the present application;

[0018] Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of part A;

[0019] Figure 4 It is a partial structural schematic diagram of an embodiment of a post insulator of the present application;

[0020] Figure 5 It is a schematic diagram of the process of the preparation method of the post insulator of the present application;

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of an embodiment of a transmission tower of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] See also Figures 1 to 4 , Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of a post insulator of the present application; Figure 2 It is a schematic cross-sectional structural diagram of an embodiment of a post insulator of the present application; Figure 3 yes Figure 2 A schematic diagram of the enlarged structure of part A; Figure 4 It is a schematic diagram of the partial structure of an embodiment of the post insulator of the present application.

[0024] An embodiment of the present application provides a post insulator 100, such as Figure 1 As shown, it includes a post insulator body 110 and an insulating sheath 120. The post insulator body 110 includes a post insulator body 110 for connecting the iron tower 10 ( Figure 11 and 12 , respectively. The first end 111 and the free end 112 opposite to the first end 111 are shown in the figure, and the insulating sheath 120 is wrapped around the free end 112 .

[0025] Specifically, a suspension insulator is hung on the outer end of the iron cross arm of the existing iron tower 10, and the lower end of the suspension insulator is connected to the transmission line. Under the action of external forces such as strong winds, the line will swing due to wind deviation. The support insulator 100 of the present application is arranged on the iron cross arm, and is located between the suspension insulator and the tower body of the iron tower 10. When the line swings due to wind deviation, the support insulator 100 can prevent the line from approaching the tower body of the iron tower 10, thereby preventing a wind deviation flashover accident from occurring.

[0026] The present application uses an insulating sheath 120 to wrap the free end 112, thereby avoiding the use of a hardware structure for the free end 112, thereby avoiding the phenomenon that the metal parts of the free end 112 may generate floating potential and partial discharge in the high-voltage field, and preventing the rapid aging of the product or even insulation failure. In addition, if the free end 112 of the post insulator body 110 uses a metal part, there is a risk of friction with the wire and damage to the wire. The present application uses an insulating sheath 120 to wrap the free end 112, which can avoid friction with the wire and damage to the wire.

[0027] In addition, this embodiment uses a post insulator 100 to replace a traditional line insulator as a wind deflection insulator. The diameter of a traditional line insulator is relatively small and cannot withstand large bending resistance. It needs to be directly connected to the wire to prevent wind deflection. When the wind deflection angle is too large, the wire may cause excessive deflection or breakage after acting on the line insulator. However, if the post insulator 100 is used as a wind deflection insulator, it does not need to be directly connected to the wire. The first end 111 of the post insulator body 110 of this embodiment is connected to the iron tower 10, and the free end 112 is wrapped with an insulating sheath 120 without being directly connected to the wire, and is arranged between the iron tower 10 and the wire. Therefore, when the power grid is energized, it can be directly installed or modified on the iron tower 10 without power outage, which brings huge market value to power grid customers. In extreme typhoon weather, the post insulator 100 uses its own gravity to block the wind-deflected conductor and absorb energy. When the conductor swings with the wind and hits the post insulator 100, it can be effectively supported, and the maximum wind swing angle of the conductor can be controlled, effectively preventing the wind-deflected flashover accident caused by the conductor approaching the iron tower 10 due to the wind swing, and ensuring the safe electrical clearance between the conductor and the iron tower 10 under strong wind conditions. Under extreme conditions, the conductor will not act on the post insulator 100, causing it to have excessive deflection or break.

[0028] In one embodiment, if Figure 2 and Figure 3As shown, the insulating sheath 120 is cup-shaped and buckled on the free end 112. By providing the cup-shaped insulating sheath 120 and buckling the insulating sheath 120 on the free end 112, the free end 112 of the post insulator 100 can be completely wrapped, which is convenient for installation.

[0029] Specifically, Figure 2 and Figure 3 As shown, the post insulator body 110 includes a core rod 113 and an insulating shed 114 wrapped outside the core rod 113, and the end of the core rod 113 extending out of the insulating shed 114 and away from the iron tower 10 is a free end 112, and the insulating sheath 120 is buckled outside the core rod 113 and seamlessly connected to the insulating shed 114 outside the post insulator body 110. Therefore, the insulating sheath 120 can completely wrap the core rod 113 exposed outside the insulating shed 114, replacing the traditional metal parts, and effectively avoiding the phenomenon that the metal parts of the free end 112 may generate floating potential and partial discharge in the high voltage field strength.

[0030] Furthermore, the insulating sheath 120 is made of high temperature vulcanized silicone rubber, which has good heat resistance, hydrophobicity, electrical insulation and aging resistance, and is suitable for use in power transmission insulation equipment.

[0031] like Figure 3 As shown, in order to enhance the connection strength between the insulating sheath 120 and the post insulator body 110, a connecting layer (not shown in the figure) is provided between the insulating sheath 120 and the post insulator body 110, and the connecting layer is respectively adhered to the insulating sheath 120 and the post insulator body 110, thereby enhancing the connection strength between the insulating sheath 120 and the core rod 113 and preventing the insulating sheath 120 from falling off.

[0032] Furthermore, the connection layer is room temperature vulcanized silicone rubber, which is coated inside the insulating sheath 120, and then the insulating sheath 120 is buckled on the free end 112 of the post insulator body 110. The room temperature vulcanized silicone rubber is respectively bonded to the post insulator body 110 and the insulating sheath 120, and a connection layer is formed after the room temperature vulcanized silicone rubber is cured. The use of room temperature vulcanized silicone rubber coating has good operational feasibility and good bonding performance.

[0033] In one embodiment, if Figure 3As shown, the outer wall of the open end of the insulating sheath 120 has an inclined surface 121 inclined toward the post insulator body 110, and a connecting groove 122 is formed between the inclined surface 121 and the end surface of the insulating shed 114. The connecting groove 122 allows the excess room temperature vulcanized silicone rubber between the insulating sheath 120 and the post insulator body 110 to overflow, thereby improving the connection tightness between the insulating sheath 120 and the post insulator body 110. Furthermore, the connecting groove 122 can also be filled with high temperature vulcanized silicone rubber to enhance the connection tightness between the inclined surface 121 of the insulating sheath 120 and the end surface of the insulating shed 114, and because the aging performance of the high temperature vulcanized silicone rubber exposed outdoors is better than that of the room temperature vulcanized silicone rubber, the use of the high temperature vulcanized silicone rubber to wrap the connecting groove 122 can not only ensure the sealing connection between the insulating sheath 120 and the core rod 113 and the insulating shed 114, but also ensure the overall aging resistance of the post insulator 100.

[0034] In one embodiment, if Figure 2 and Figure 4 As shown, the first end 111 of the post insulator body 110 is connected to an end fitting 140 for connecting to the iron tower 10, and the end fitting 140 includes a sleeve 141, a plate 142 and a reinforcing rib 143. The sleeve 141 is sleeved and fixed on the first end 111, and the other end of the core rod 113 of the post insulator body 110 extending out of the insulating shed 114 is the first end 111, and the sleeve 141 is sleeved and fixed outside the core rod 113. A U-shaped groove 1421 matching the end of the sleeve 141 is provided at one end of the plate 142, and the plate 142 is fixed to the end of the sleeve 141 through the U-shaped groove 1421. Since the plate 142 is fixed to the end of the sleeve 141 through the U-shaped groove 1421, the contact area between the plate 142 and the sleeve 141 is increased, and the connection stability is improved. Specifically, the flat plate 142 can be fixed to the sleeve 141 by welding. In other embodiments, the flat plate 142 can also be integrally formed with the sleeve 141, which is not limited here. The reinforcing rib 143 is located in the space formed by the surface of the flat plate 142 and the end face of the sleeve 141. One side of the reinforcing rib 143 is fixedly arranged on the surface of the flat plate 142, and the other side is fixedly arranged on the end face of the sleeve 141, and the reinforcing rib 143 can be perpendicular to the surface of the flat plate 142 and the end face of the sleeve 141 at the same time. The reinforcing rib 143 improves the connection strength between the flat plate 142 and the sleeve 141 to prevent it from bending or detaching under extreme weather conditions. Specifically, the reinforcing rib 143 can be fixed to the flat plate 142 and the sleeve 141 by welding. In other embodiments, the reinforcing rib 143 can also be integrally formed with the flat plate 142, which is not limited here.

[0035] In one embodiment, if Figure 4As shown, the post insulator 100 further includes a connection fitting 150, through which the end fitting 140 is connected to the iron tower 10, and the connection fitting 150 includes two right-angle plates 151 and a plane plate 152, the two right-angle plates 151 are symmetrically clamped at the angle steel of the iron tower 10, one of the right-angle plates 151 is arranged in contact with the inner wall of the angle steel, and the other right-angle plate 151 is arranged in contact with one side of the outer wall of the angle steel, and the two right-angle plates 151 are fixed by fasteners 153, and the plane plate 152 is arranged in contact with the other side of the outer wall of the angle steel, and is respectively fixed to the two right-angle plates 151 by fasteners 153. The end fitting 140 is located on the side of one of the right-angle plates 151 away from the plane plate 152, and the end fitting 140 is fixed to the connection fitting 150 by fasteners 153, and it should be noted that the end fitting 140, the right-angle plate 151 and the plane plate 152 can be fixed by passing through the same fastener 153. Thus, the connection fitting 150 fixes the post insulator body 110 on the iron tower 10 by clamping, without drilling holes on the iron tower 10, without affecting the strength of the iron tower 10 itself, and can ensure the universality and convenience of the connection fitting 150 in different installation positions of the iron tower 10. Specifically, the fastener 153 can be a bolt or other parts for fastening, and other common connection methods such as welding or gluing can also be used.

[0036] See also Figure 5 , Figure 5 It is a schematic flow chart of the method for preparing the post insulator of the present application.

[0037] Another embodiment of the present application provides a method for preparing a post insulator, comprising the following steps:

[0038] S101: forming a cup-shaped insulating sheath 120.

[0039] A cup-shaped insulating sheath 120 is formed, and the insulating sheath 120 matches the free end 112 of the post insulator body 110 . The insulating sheath 120 is made of high-temperature vulcanized silicone rubber and has excellent aging resistance.

[0040] S102: coating the room temperature vulcanized silicone rubber on the inner wall of the insulating sheath 120, buckling the insulating sheath 120 coated with the room temperature vulcanized silicone rubber outside the free end 112, and waiting for the room temperature vulcanized silicone rubber to solidify.

[0041] The room temperature vulcanized silicone rubber is coated on the inner wall of the insulating sheath 120, and the room temperature vulcanized silicone rubber is coated inside the insulating sheath 120, and then the insulating sheath 120 is buckled on the free end 112 of the post insulator body 110, and the excess room temperature vulcanized silicone rubber is wiped off. The room temperature vulcanized silicone rubber is adhered to the post insulator body 110 and the insulating sheath 120 respectively, and a connection layer can be formed after the room temperature vulcanized silicone rubber is cured, thereby enhancing the connection strength between the insulating sheath 120 and the post insulator body 110.

[0042] The room temperature vulcanized silicone rubber coating has good operational feasibility and good bonding performance.

[0043] S103: Fill the connecting groove 122 with the mixed rubber.

[0044] The outer wall of the open end of the insulating sheath 120 has an inwardly inclined slope 121 , and a connecting groove 122 is formed between the slope 121 and the end surface of the insulating shed 114 outside the post insulator 100 , and the connecting groove 122 is filled with mixed rubber.

[0045] S104 : The mixed rubber in the connection groove 122 is heated and pressurized to be cured to form high temperature vulcanized silicone rubber, thereby preparing the post insulator 100 .

[0046] The mixed rubber in the connection groove 122 is heated and pressurized by a heating mold to cure, so as to form a high temperature vulcanized silicone rubber, thereby preparing a post insulator 100. The aging performance of the high temperature vulcanized silicone rubber exposed outdoors is better than that of the room temperature vulcanized silicone rubber. The use of a heating mold can heat and pressurize only the mixed rubber in the connection groove 122, and the heating temperature will not affect the insulating sheath 120 and the insulating shed 114. At the same time, the high temperature vulcanized silicone rubber can enhance the connection tightness between the inclined surface 121 of the insulating sheath 120 and the end surface of the insulating shed 114.

[0047] In yet another embodiment, the following steps are also included:

[0048] S105: grinding the cured high temperature vulcanized silicone rubber at the connection groove 122 .

[0049] The cured high temperature vulcanized silicone rubber at the connection groove 122 is polished to make its surface smooth and beautiful.

[0050] See also Figure 6 , Figure 6 It is a schematic diagram of the three-dimensional structure of an embodiment of a transmission tower of the present application.

[0051] Another embodiment of the present application provides a transmission tower 200, which is equipped with a post insulator 100, and the post insulator 100 is any of the above-mentioned post insulators 100. At least one post insulator 100 is arranged on the transmission tower 200 to prevent the conductor 20 from approaching the tower body in the case of wind deviation.

[0052] In this embodiment, one post insulator 10 is provided, and the post insulator 100 is only provided on one side of the transmission tower 200 where the conductor 20 is arranged, and is located between the conductor 20 and the tower body. In other embodiments, at least two post insulators 100 are provided, and are symmetrically arranged on both sides of the transmission tower 200 to respectively block the conductors 20 on both sides of the transmission tower 200 from approaching the transmission tower 200. For example, two, four or more post insulators 100 are provided, and one, two or more are provided on each side.

[0053] In other embodiments, at least two post insulators 100 may be provided on the side of the transmission tower 200 where the conductor 20 is provided, and symmetrically arranged on both sides of the iron cross arm along the direction of the conductor 20. Thus, the post insulator 100 can effectively prevent the conductor 20 from approaching the transmission tower 200, and at least two post insulators 100 can share the impact force of the wind-deflected conductor 20 to improve the overall compression resistance. Specifically, two post insulators 100 are provided, and in other embodiments, three, four or more post insulators may be provided.

[0054] It should be noted that the post insulator 100 includes a post insulator body 110 and an insulating sheath 120 . The post insulator body 110 includes a first end 111 for connecting to the transmission tower 200 and a free end 112 opposite to the first end 111 , and the insulating sheath 120 is wrapped around the free end 112 .

[0055] By wrapping the free end 112 with an insulating sheath 120, it is possible to avoid the free end 112 using a metal fitting structure, thereby avoiding the phenomenon that the metal parts of the free end 112 may generate floating potential and partial discharge in the high-voltage field, and preventing the rapid aging of the product or even insulation failure. In addition, if the free end 112 of the post insulator body 110 uses a metal part, there is a risk of friction with the wire 20 and damage to the wire 20. In this application, the free end 112 is wrapped with an insulating sheath 120 to avoid friction with the wire 20 and damage to the wire 20.

[0056] The present application adopts the post insulator 100 to replace the traditional line insulator as the wind deflection insulator. The diameter of the traditional line insulator is relatively small, and it cannot withstand large bending resistance. It needs to be directly connected to the conductor 20 to prevent wind deflection. However, the post insulator 100 is used as the wind deflection insulator, and it does not need to be directly connected to the conductor 20. The first end 111 of the post insulator body 110 of the present application is connected to the iron tower 10, and the free end 112 is wrapped with the insulating sheath 120 without directly connecting to the conductor 20, and is arranged between the transmission tower 200 and the conductor 20, so that when the power grid is energized, the post insulator 100 can be directly installed or modified on the transmission tower 200 without power outage, which brings huge market value to power grid customers. In extreme typhoon weather, the post insulator 100 uses its own gravity to block the wind deflection of the conductor 20 and absorb energy. When the conductor 20 swings with the wind and hits the post insulator 100, it can be effectively supported, and the maximum wind swing angle of the conductor 20 can be controlled, effectively preventing the wind deflection flashover accident caused by the conductor 20 approaching the transmission tower 200 due to the wind swing, and ensuring the safe electrical clearance between the conductor 20 and the transmission tower 200 under strong wind conditions. Under extreme conditions, the conductor 20 will not act on the post insulator 100, causing it to have excessive deflection.

[0057] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent principle transformation made using the contents of the description and drawings of the present application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A post insulator, characterized in that: include: A post insulator body, comprising a first end for connecting to an iron tower and a free end opposite to the first end; An insulating sheath wrapped around the free end, the insulating sheath is cup-shaped, and the insulating sheath is buckled on the free end; The post insulator body comprises a core rod and an insulating shed wrapped around the core rod, the end of the core rod extending out of the insulating shed is the free end, the insulating sheath is buckled outside the core rod and seamlessly connected to the insulating shed on the outside of the post insulator body; the outer wall of the open end of the insulating sheath has an inclined surface inclined toward the post insulator body, and a connecting groove is formed between the inclined surface and the end face of the insulating shed.

2. The post insulator according to claim 1, characterized in that: The connection groove is filled with high temperature vulcanized silicone rubber.

3. The post insulator according to claim 1, characterized in that: A connection layer is provided between the insulating sheath and the post insulator body, and the connection layer is respectively adhered to the insulating sheath and the post insulator body.

4. The post insulator according to claim 3, characterized in that: The insulating sheath is made of high-temperature vulcanized silicone rubber, and the connecting layer is made of room-temperature vulcanized silicone rubber.

5. The post insulator according to any one of claims 1 to 4, characterized in that: The first end is connected to an end fitting for connecting the iron tower, and the end fitting comprises: A sleeve, sleeved and fixed on the first end; A flat plate, one end of which is provided with a U-shaped groove matching the end of the sleeve, and the flat plate is fixed to the end of the sleeve by clamping the U-shaped groove; The reinforcing rib is located in a space formed by the surface of the plate and the end surface of the sleeve. One side of the reinforcing rib is fixedly arranged on the surface of the plate, and the other side of the reinforcing rib is fixedly arranged on the end surface of the sleeve.

6. A method for preparing a post insulator, characterized in that: The method comprises the following steps: An insulating sheath is formed into a cup shape, and the insulating sheath matches the free end of the post insulator body; Coating room temperature vulcanized silicone rubber on the inner wall of the insulating sheath; Buckling the insulating sheath coated with the room temperature vulcanized silicone rubber outside the free end, and waiting for the room temperature vulcanized silicone rubber to solidify; The outer wall of the open end of the insulating sheath has an inwardly inclined slope, and a connecting groove is formed between the inclined surface and the end surface of the insulating shed outside the post insulator, and the connecting groove is filled with mixed rubber; The mixed rubber in the connection groove is heated and pressurized to be cured to form high-temperature vulcanized silicone rubber, thereby preparing the post insulator.

7. The preparation method according to claim 6, characterized in that: Also includes: The high temperature vulcanized silicone rubber at the connection groove is polished after being cured.

Images