A coating mold for a bell-shaped composite insulator and its coating method

Abstract

This invention discloses a coating mold and coating method for bell-shaped composite insulators, belonging to the technical field of insulator coating. It includes an upper mold, a middle mold, and a bottom mold that can be assembled from top to bottom to form a mold cavity. The key feature is that the bottom mold has a steel cap insertion hole communicating with the mold cavity, with a trapezoidal platform above the steel cap insertion hole. The upper mold has a positioning hole communicating with the mold cavity, into which a steel foot clamp is inserted, allowing the upper and bottom molds to move relative to each other. A lifting frame is installed on the bottom mold. The middle mold includes a left and right split body that are slidably mounted on the lifting frame and distributed laterally. A central stop block is provided on the bottom mold. A first limiting block is provided on the left split body, and a second limiting block is provided on the right split body. The first limiting block can abut against the left side wall of the central stop block, and the second limiting block can abut against the right side wall of the central stop block. This coating mold enables molded composite coating of bell-shaped insulators, improving the coating quality.

Description

Technical Field

[0001] This invention belongs to the field of insulator coating technology, specifically relating to a coating mold and coating method for a bell-shaped composite insulator. Background Technology

[0002] An insulator is a special type of insulating component, typically installed between conductors at different potentials or between a conductor and a grounding structure, serving both electrical insulation and mechanical fixation. Insulators are generally classified into suspension insulators and post insulators based on their installation method. Suspension insulators are further divided into disc insulators and bell insulators. Disc insulators have two or more vertically distributed awnings on the lower perimeter of the insulator, while bell insulators have a raised ring on the bottom wall of the insulator. Because disc insulators have a lower pass rate in steep wave impulse tests, they cannot be used in harsh environments with frequent lightning strikes and poor grounding. Bell insulators, on the other hand, have excellent steep wave resistance performance, and therefore their application is becoming increasingly widespread.

[0003] Currently, bell-shaped insulators primarily use porcelain insulators. However, porcelain insulators have poor pollution resistance, easily accumulating dust during application, reducing their insulation performance, and even causing flashover. Silicone rubber, on the other hand, not only possesses high insulation strength but also excellent hydrophobic and hydrophobic migration properties, making it the preferred material for external electrical insulation against flashover. Therefore, the idea has been to laminate a layer of silicone rubber onto the insulator body of bell-shaped insulators to enhance their pollution resistance.

[0004] Because of the complex structure of bell-shaped insulators, the disc-shaped insulator covering mold (CN115742190A) developed by the inventors cannot be applied to the mechanized covering of bell-shaped insulators. As a result, the composite of bell-shaped insulators still adopts the manual bonding method. This method is not only inefficient, but also has a large number of pores at the bonding point, which affects the stability of the bonding and makes the silicone rubber layer easy to fall off, resulting in short protection time. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a coating mold and coating method for bell-shaped composite insulators, which enables molded composite and coating of bell-shaped insulators and improves the coating quality.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A bell-shaped composite insulator encapsulation mold is designed, comprising an upper mold, a middle mold, and a bottom mold that can be assembled together from top to bottom. The upper mold, middle mold, and bottom mold together form a mold cavity. The mold cavity includes a flange disk cavity and a raised cavity. The bottom mold and the middle mold form the flange disk cavity. The upper mold can extend into the middle mold. The upper mold and the middle mold form the raised cavity, which connects to the flange disk cavity. The flange disk cavity connects to the injection hole. The bottom mold has a steel cap insertion hole that connects to the mold cavity. The upper part of the steel cap insertion hole has a stepped platform. The upper mold has a positioning hole. One end of the positioning hole connects to the mold cavity, and the other end connects to the outer wall of the upper mold. A steel foot clamp is inserted into the positioning hole. The upper mold and the bottom mold can rise and fall relative to each other. The mold cavity includes a parachute cavity, which is inclined outward from bottom to top, and the outer end of the parachute cavity does not extend beyond the outer end of the mold cavity; A lifting frame is installed on the bottom mold. The middle mold includes a left split and a right split that are distributed laterally. The left split and the right split are slidably installed on the lifting frame. A centering block is provided on the bottom mold. A first limiting block is provided on the left split and a second limiting block is provided on the right split. The first limiting block can abut against the left side wall of the centering block and the second limiting block can abut against the right side wall of the centering block. When the first limiting block and the second limiting block abut against the centering block, the left split and the right split are brought together.

[0007] Preferably, the lifting frame includes a crossbeam and a first lifting mechanism located at both ends of the crossbeam, and the left and right splits are slidably mounted on the crossbeam.

[0008] Preferably, the crossbeam is a guide rail, on which a first slider and a second slider are mounted. The first slider is located on the left split, and the second slider is located on the right split.

[0009] Preferably, the lower part of the positioning hole is flared from top to bottom.

[0010] Preferably, a first locking mechanism is provided between the middle mold and the bottom mold, and a second locking mechanism is provided between the upper mold and the middle mold.

[0011] Preferably, the first locking mechanism includes a groove and a protrusion. The groove is located on the outer periphery of the mold cavity, and the protrusion can be fitted into the groove. The groove and the protrusion are respectively disposed on the bottom mold and the middle mold.

[0012] Preferably, the groove is an annular groove and the protrusion is an annular protrusion.

[0013] Preferably, the second locking mechanism includes two or more insertion holes, which are located on the outer periphery of the mold cavity. Insertion blocks can be installed in the insertion holes, and the insertion holes and insertion blocks are correspondingly arranged on the middle mold and the upper mold.

[0014] Preferably, the steel foot clamp includes a first part and a second part. The first part can be connected with the second part to form an end block cavity. The bottom wall of the steel foot clamp has an insertion port that communicates with the end block cavity, and the upper end has a connecting part with a connecting piece.

[0015] The present invention also provides a method for coating the above-mentioned bell-shaped composite insulator coating mold, characterized by comprising the following steps: (1) Install the clamp: Install the steel foot clamp on the steel foot of the bell-shaped insulator; (2) Installing insulators: Invert the bell-shaped insulator, insert the steel cap of the bell-shaped insulator into the steel cap socket, and support the steel cap with the ladder platform; (3) Mold closing: After steps (1) and (2), move the left and right split parts in opposite directions, first merge the middle mold, then lower the middle mold so that the middle mold and the bottom mold merge, and finally move the upper mold and / or the bottom mold, insert the steel foot clamps into the positioning holes, and merge the upper mold and the middle mold; or After steps (1) and (2), the left and right split parts are moved towards each other, the middle mold is merged first, and then the upper mold and / or bottom mold is moved. The middle mold moves towards the bottom mold along with the upper mold and / or bottom mold. Finally, the upper mold and the middle mold are merged, and the middle mold and the bottom mold are merged. (4) Fluidization: Inject silicone rubber into the mold cavity after mold closing in step (3), and then fluidize it; (5) Mold opening: After the fluidization in step (4) is completed, move the upper mold and / or the bottom mold first. The upper mold and the middle mold are separated. The lifting frame drives the middle mold and the bottom mold to separate. After the middle mold is separated from the upper end of the flange and the convex ring of the bell-shaped insulator, move the left and right parts in opposite directions to open the middle mold, take out the covered bell-shaped insulator, and complete the covering of the bell-shaped insulator.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention places the bell-shaped insulator in the mold cavity, thereby allowing the injected silicone rubber to be fluidized onto the insulator at high temperature. Under pressure, the adhesion strength of the silicone rubber is further enhanced, strengthening its integrated structure with the insulator. After encapsulation molding, the mold is opened and closed by the relative lifting between the upper and lower molds. After the middle mold obtains the lifting space relative to the lower mold, it can rise under the action of the lifting frame, so that the middle mold can first rise above the flange and the convex ring of the insulator and then move on the lifting frame to complete the opening of the middle mold, freeing it from the constraint of the insulator, thereby realizing the mechanized encapsulation of the bell-shaped insulator.

[0017] 2. Since the mold cavity also includes a wing cavity, a silicone rubber wing integral with the coating layer can be prepared while the coating layer is fluidized on the insulator, increasing the creepage distance of the insulator and improving the overall safety of the insulator. The structure of the wing cavity is inclined outward from bottom to top, and the outer end of the wing cavity does not exceed the outer end of the mold cavity. This can effectively extend the length of the inner and outer ends of the wing while ensuring that the outer end of the silicone rubber wing does not exceed the outer end of the insulator flange. This allows the silicone rubber wing to be under the protection of the insulator, which is conducive to improving the dryness of the silicone rubber wing and maintaining its insulation properties.

[0018] 3. Because the steel cap insertion hole is located on the bottom mold, and the positioning hole for inserting the steel foot clamp is located on the upper mold, the bottom mold can support the entire insulator by supporting the steel cap. However, the steel foot clamp, under its own weight, is located near the lower part of the insulator, preventing it from being fully engaged in the positioning hole. This gap allows air in the mold cavity to leak out, reducing the injection resistance of the silicone rubber, facilitating its uniform distribution within the mold cavity, and enhancing the adhesion between the silicone rubber and the insulator. Furthermore, it provides a certain range of movement space for the upper part of the insulator, preventing the mold from locking the insulator. This ensures uniform coverage of the insulator and avoids porcelain damage caused by locking.

[0019] 4. Because the lifting frame adopts a structure with the first lifting mechanism set at both ends of the crossbeam, and then the left and right parts are slidably installed on the crossbeam, the lifting frame adopts a gantry structure, which can make full use of its hollow space and greatly simplify its structure, thus improving the cost performance of the lifting frame.

[0020] 5. Since a crossbeam is used as a guide rail, and a first slider and a second slider are installed on the guide rail, the first slider is set on the left split and the second slider is set on the right split, which can further simplify the structure of the lifting frame while still being able to realize the horizontal opening and closing of the middle mold.

[0021] 6. Because the lower part of the positioning hole is flared from top to bottom, it can not only form an air venting channel between the steel foot clamp and the side wall of the positioning hole under its own weight, but also achieve the final locking of the steel foot clamp under the action of glue injection pressure, thus achieving the function of injecting glue and venting at the same time.

[0022] 7. Since both the first and second locking mechanisms adopt plug-in mechanisms, they can not only constrain the assembly positions between the molds and improve the assembly quality between the molds, but also have a simple structure, are easy to implement, and improve the cost performance of the locking mechanism.

[0023] 8. Because the steel foot clamp adopts an assembly structure consisting of a first part and a second part, it is easy to install and disassemble the steel foot clamp and convenient to use.

[0024] 9. This invention, through the setting of the steel cap insertion hole and the steel foot positioning hole, the use of the steel foot clamp, and the lifting and opening method of the middle mold, achieves the molded covering of the bell-shaped insulator without damaging the insulator, enhances the integration of the silicone rubber layer and the insulator, helps to extend the protective effect of the silicone rubber layer, and facilitates its promotion and application in the industry. Attached Figure Description

[0025] Figure 1 This is a three-dimensional exploded structural diagram of the present invention; Figure 2 yes Figure 1 View from direction A; Figure 3 yes Figure 2 BB section view; Figure 4 yes Figure 1 The C-direction view; Figure 5 This is a schematic diagram of the usage state of the present invention; Figure 6 yes Figure 5 A magnified view of part I in the middle.

[0026] The diagram shows the following markings: 1. Upper mold; 2. Right split body; 3. Left split body; 4. Mold cavity; 5. Flange disc cavity; 6. Protruding cavity; 7. Fly wing cavity; 8. Bottom mold; 9. Elastic support body; 10. Guide rail; 11. Centering block; 12. First slider; 13. Second slider; 14. Second limiting block; 15. First limiting block; 16. Annular groove; 17. Annular protrusion; 18. Insert block; 19. Positioning hole; 20. Steel cap insertion hole; 21. Ladder platform; 22. First split body; 23. Second split body; 24. Nut; 25. Screw; 26. End block cavity; 27. Insertion port; 28. Insulator; 28-1. Steel cap; 28-2. Steel foot. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] When the present invention is in use, the end furthest from the ground is defined as the top or upper end, and the end closest to the ground is defined as the bottom or lower end; the side closest to the center of the mold cavity 4 is defined as the inner side, and the side furthest from the center of the mold cavity 4 is defined as the outer side; when viewed from the front... Figure 2 The left-hand direction is defined as leftward, and the right-hand direction is defined as rightward.

[0029] like Figure 1As shown, this invention includes an upper mold 1, a middle mold, and a bottom mold 8 that can be assembled together from top to bottom. Specifically, a hydraulic cylinder (not shown in the figure) can be connected to the bottom mold 8. The hydraulic cylinder drives the bottom mold 8 to rise and fall, achieving relative lifting between the upper mold 1 and the bottom mold 8. Alternatively, besides using a hydraulic cylinder as a second lifting mechanism to drive the bottom mold 8, a screw mechanism can also be used to convert the rotation of the screw into vertical movement, thus achieving the same lifting function. Figure 3 As shown, the upper mold 1, middle mold, and bottom mold 8 are assembled together to form a mold cavity 4. The mold cavity 4 is provided with a flange disk cavity 5 and a raised cavity 6. The bottom mold 8 and the middle mold form the flange disk cavity 5. The upper mold 1 can extend into the middle mold. The upper mold 1 and the middle mold form the raised cavity 6. The raised cavity 6 is connected to the flange disk cavity 5. The flange disk cavity 5 is connected to the injection hole. In this way, the mating surface of the bottom mold 8 and the middle mold is located at the outermost end of the flange disk cavity 5, and the mating surface of the middle mold and the upper mold 1 is located at or above the top of the raised cavity. The bottom mold 8 has a steel cap insertion hole 20 that connects to the mold cavity 4. The upper part of the steel cap insertion hole 20 has a ladder 21. This structure not only provides sufficient space for the steel cap 28-1 to be inserted in the lower part of the steel cap insertion hole 20, but also supports the steel cap 28-1 by means of the ladder 21. The upper mold 1 has a positioning hole 19 that connects to the mold cavity 4. The other end of the positioning hole 19 connects to the outer wall of the upper mold 1. The lower part of the positioning hole 19 is flared from top to bottom. A steel foot clamp is inserted into the positioning hole 19, so that the bottom mold 8 can support the entire insulator 28 by supporting the steel cap 28-1, while the steel foot clamp is positioned under its own weight. The lower part near the insulator prevents the steel foot clamp from fully engaging in the positioning hole 19, creating a gap between the steel foot clamp and the side wall of the positioning hole 19. This gap allows air in the mold cavity 4 to leak out, reducing the injection resistance of the silicone rubber and facilitating its uniform distribution within the mold cavity 4. The pressure in the mold cavity 4 also enhances the adhesion between the silicone rubber and the insulator. Furthermore, it allows the upper part of the insulator 28 to have a certain range of movement, preventing the mold from locking the insulator 28. This ensures uniform coverage of the insulator 28 while avoiding the damage rate caused by locking.

[0030] To enhance the creepage distance of insulator 28, such as Figure 3As shown, the present invention also provides a wing cavity 7 connected to the mold cavity 4. The mold mating surface of the upper mold 1 and the middle mold is located at the outermost end of the wing cavity 7. This allows for the preparation of a silicone rubber wing integral with the mold cavity 4 while the coating layer is fluidized on the insulator, increasing the creepage distance of the insulator 28 and improving the overall safety of the insulator 28. The wing cavity 7 is designed to be inclined outward from bottom to top, and the outer end of the wing cavity 7 does not exceed the outer end of the mold cavity 4. This effectively extends the length of the inner and outer ends of the wing while ensuring that the outer end of the silicone rubber wing does not exceed the outer end of the insulator flange. This allows the silicone rubber wing to be protected by the insulator, which is beneficial for improving the dryness of the silicone rubber wing and maintaining its insulation properties.

[0031] The present invention has a gantry-type lifting frame installed on the bottom mold 8, such as... Figure 2 and Figure 4 As shown, the lifting frame specifically uses a guide rail 10 as a crossbeam. Both ends of the guide rail 10 are connected to elastic support bodies 9. The elastic support body 9 can be a structure in which an elastic body is installed in a cylinder and a telescopic rod is connected to the elastic body. A first slider 12 and a second slider 13 are mounted on the guide rail 10. The middle mold is designed as a horizontally distributed left split 3 and right split 2. The first slider 12 is located on the left split 3, and the second slider 13 is located on the right split 2. A centering block 11 is also provided on the bottom mold 8. A first limiting block 15 is provided on the left split 3, and a second limiting block 14 is provided on the right split 2. The first limiting block 15 can abut against the left side wall of the centering block 11, and the second limiting block 14 can abut against the right side wall of the centering block 11. When the first limiting block 15 and the second limiting block 14 abut against the centering block 11, the left split 3 and the right split 2 close together, completing the mold closing of the middle mold. By using the centering block 11 to define the mold-closing position of the left split body 3 and the right split body 2, the mold-closing position of the left split body 3 and the right split body 2 relative to the bottom mold 8 is ensured, thereby improving the mold-closing quality. Of course, in addition to using a gantry-type lifting frame composed of guide rail 10 and the first lifting mechanism, other lifting frames with specific structures can also be used, as long as the left split body 3 and the right split body 2 can be slidably installed on the lifting frame and can be lifted and lowered by the lifting frame. No specific requirements are placed on its structure.

[0032] To prevent the molds from shifting under external forces such as injection pressure after mold closing, such as... Figure 1 and Figure 3As shown, the present invention also provides a first locking mechanism between the middle mold and the bottom mold 8, and a second locking mechanism between the upper mold 1 and the middle mold. Specifically, the first locking mechanism has an annular groove 16 on the top wall of the bottom mold 8 located on the outer periphery of the mold cavity 4, and an annular protrusion 17 on the bottom wall of the middle mold, the annular protrusion 17 being able to fit into the annular groove 16; the second locking mechanism has four insert blocks 18 on the top wall of the middle mold, the four insert blocks 18 being located on the outer periphery of the mold cavity 4 and evenly distributed along the circumference of the mold cavity 4, and four insertion holes on the bottom wall of the upper mold 1, the insert blocks 18 being able to be inserted into the insertion holes one by one. Of course, the annular groove 16 can also be formed on the bottom wall of the middle mold, and the annular protrusion 17 can be set on the top wall of the upper mold 1. This can also achieve the plug-in locking between the upper mold 1 and the middle mold. The groove does not have to be annular; an annular slot can be used to ensure that the insertion part is evenly stressed, improve the endurance of the first locking mechanism, and extend its service life. Similarly, the insertion block 18 can also be set on the bottom wall of the upper mold 1, and the insertion hole can be formed on the top wall of the middle mold. In addition to the above-mentioned plug-in structure, the first locking mechanism and the second locking mechanism can also use other locking mechanisms, as long as they can achieve the locking between the upper mold 1 and the middle mold, and between the middle mold and the bottom mold 8. No specific requirements are made for their structure.

[0033] To facilitate the installation and removal of the steel foot clamp on steel foot 28-2, such as Figure 6 As shown, the steel foot clamp used in this invention adopts a split structure, namely, it consists of a first split 22 and a second split 23. The first split 22 and the second split 23 can be connected to form an end block cavity 26. The bottom wall of the steel foot clamp has an insertion port 27 that communicates with the end block cavity 26, and the upper end has a half-screw. The two half-screws together form a screw 25, and a nut 24 is fitted on the screw 25. Of course, other connecting parts and connecting parts that mate with the connecting parts can also be used. For example, the connecting part can adopt a snap-fit ​​structure, and the connecting part can adopt a snap-fit ​​component, as long as the first split 22 and the second split 23 can be detachably connected. In this way, the first split 22 and the second split 23 can be combined and connected together by the nut 24, that is, the half-screw serves as the connecting part, and the nut 24 serves as the connecting component. The height of the end block cavity 26 is greater than the height of the steel foot end block, so that the steel foot clamp can move a certain distance along the axial direction of the steel foot 28-2 after it is installed on the steel foot 28-2.

[0034] The working process of this invention is as follows: (1) Installing the clamp: Place the first part 22 of the steel foot clamp on one side of the steel foot 28-2 in the insulator 28, and the second part 23 on the other side of the steel foot 28-2. The steel foot end block is located in the end block cavity 26. After the first part 22 and the second part 23 are combined, the rod part of the steel foot 28-2 extends out from the socket 27. Then, screw the nut 24 onto the screw 25 formed by the combination of the first part 22 and the second part 23. In this way, the steel foot clamp is installed on the bell-shaped insulator 28 steel foot 28-2. (2) Installing the insulator: Invert the bell-shaped insulator and insert the steel cap 28-1 of the bell-shaped insulator into the steel cap socket 20. The ladder platform 21 supports the steel cap 28-1. (3) Mold closing: such as Figure 5 As shown, after steps (1) and (2), the first slider 12 and the second slider 13 are moved so that the first slider 12 and the second slider 13 drive the left split 3 and the right split 2 to move towards each other until the first limiting block 15 on the left split 3 and the second limiting block 14 on the right split 2 respectively abut against the center stop block 11, so that the left split 3 and the right split 2 are joined together, the middle mold is merged, and then the hydraulic cylinder drives the bottom mold 8 to rise, the steel foot clamp is inserted into the positioning hole 19, the elastic support body 9 is compressed, and the middle mold is merged with the bottom mold on the upper mold 1. (4) Injection fluidization: Inject silicone rubber into the mold cavity 4 after mold closing in step (3), and then fluidize it at high temperature; (5) Mold opening: After the fluidization in step (4) is completed, the bottom mold 8 is lowered by the hydraulic cylinder, so that there is a certain space between the upper mold 1 and the bottom mold 8, allowing the elastic support 9 to separate from the bottom mold 8 along with the upper mold 1. At the same time as the upper mold 1 separates from the middle mold, the middle mold separates from the bottom mold 8. After the middle mold separates from the upper end of the flange of the bell-shaped insulator, it faces away from the first slider 12 and the second slider 13, causing the left split 3 and the right split 2 to separate. The middle mold is opened, and the covered bell-shaped insulator is taken out, completing the covering of the bell-shaped insulator.

[0035] In addition to using the aforementioned elastic support 9 as the first lifting mechanism, telescopic components such as cylinders and hydraulic cylinders can also be used to achieve the lifting and lowering of the guide rail 10. When using a hydraulic cylinder or a pneumatic cylinder, the left split 3 and the right split 2 move in opposite directions, first merging the middle mold, then lowering the middle mold so that the middle mold merges with the bottom mold 8, and finally moving the bottom mold 8 so that the steel foot clamp is inserted into the positioning hole 19, and the upper mold 1 merges with the middle mold; when opening the mold, the upper mold 1 moves first, separating the upper mold 1 from the middle mold, and the cylinder or hydraulic cylinder drives the middle mold to separate from the bottom mold 8. After the middle mold is separated from the upper end of the flange and the convex ring of the bell-shaped insulator, the left split 3 and the right split 2 move in opposite directions to open the middle mold. Of course, the upper mold 1 can also be connected to the second lifting mechanism, or the upper mold 1 and the bottom mold 8 can be connected to the second lifting mechanism respectively, which can also achieve relative lifting and lowering between the upper mold 1 and the bottom mold 8.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A mold for covering a bell-shaped composite insulator, comprising an upper mold, a middle mold, and a bottom mold that can be assembled together from top to bottom, wherein the upper mold, middle mold, and bottom mold can together form a mold cavity, characterized in that: The mold cavity includes a flange disk cavity and a raised cavity. The bottom mold and the middle mold form the flange disk cavity. The upper mold can extend into the middle mold. The upper mold and the middle mold form the raised cavity. The raised cavity is connected to the flange disk cavity, and the flange disk cavity is connected to the injection hole. The bottom mold has a steel cap insertion hole that connects to the mold cavity. The upper part of the steel cap insertion hole has a step. The upper mold has a positioning hole. One end of the positioning hole is connected to the mold cavity, and the other end is connected to the outer wall of the upper mold. A steel foot clamp is inserted into the positioning hole. The upper mold and the bottom mold can be raised and lowered relative to each other. The mold cavity includes a parachute cavity, which is inclined outward from bottom to top, and the outer end of the parachute cavity does not extend beyond the outer end of the mold cavity; A lifting frame is installed on the bottom mold. The middle mold includes a left split and a right split that are distributed laterally. The left split and the right split are slidably installed on the lifting frame. A centering block is provided on the bottom mold. A first limiting block is provided on the left split and a second limiting block is provided on the right split. The first limiting block can abut against the left side wall of the centering block and the second limiting block can abut against the right side wall of the centering block. When the first limiting block and the second limiting block abut against the centering block, the left split and the right split are joined together. The lower part of the positioning hole is flared from top to bottom, which not only allows the steel foot clamp to form an air venting channel between itself and the side wall of the positioning hole under its own weight, but also allows the steel foot clamp to be engaged under the pressure of glue injection, thus achieving the effect of injecting glue and venting air at the same time. The steel foot clamp includes a first part and a second part. The first part can be connected with the second part to form an end block cavity. The bottom wall of the steel foot clamp has an insertion port that communicates with the end block cavity, and the upper end has a connecting part with a connecting piece. The height of the end block cavity is greater than the height of the steel foot end block, so that the steel foot clamp can move a certain distance along the axial direction of the steel foot after being installed on the steel foot.

2. The covering mold for the bell-shaped composite insulator according to claim 1, characterized in that: The lifting frame includes a crossbeam and a first lifting mechanism located at both ends of the crossbeam, and the left and right splits are slidably mounted on the crossbeam.

3. The covering mold for the bell-shaped composite insulator according to claim 2, characterized in that: The crossbeam is a guide rail, on which a first slider and a second slider are mounted. The first slider is located on the left split, and the second slider is located on the right split.

4. The covering mold for the bell-shaped composite insulator according to any one of claims 1 to 3, characterized in that: A first locking mechanism is provided between the middle mold and the bottom mold, and a second locking mechanism is provided between the upper mold and the middle mold.

5. The covering mold for the bell-shaped composite insulator according to claim 4, characterized in that: The first locking mechanism includes a groove and a protrusion. The groove is located on the outer periphery of the mold cavity, and the protrusion can be fitted into the groove. The groove and the protrusion are respectively disposed on the bottom mold and the middle mold.

6. The covering mold for the bell-shaped composite insulator according to claim 5, characterized in that: The groove is an annular groove, and the protrusion is an annular protrusion.

7. The encapsulation mold for the bell-shaped composite insulator according to claim 4, characterized in that: The second locking mechanism includes two or more insertion holes, which are located on the outer periphery of the mold cavity. Insertion blocks can be installed in the insertion holes, and the insertion holes and insertion blocks are correspondingly arranged on the middle mold and the upper mold.

8. A method for covering a bell-shaped composite insulator with a covering mold according to any one of claims 1 to 7: characterized in that: Includes the following steps: (1) Install the clamp: Install the steel foot clamp on the steel foot of the bell-shaped insulator; (2) Installing insulators: Invert the bell-shaped insulator, insert the steel cap of the bell-shaped insulator into the steel cap socket, and support the steel cap with the ladder platform; (3) Mold closing: After steps (1) and (2), move the left and right parts in opposite directions, first merge the middle mold, then lower the middle mold so that the middle mold and the bottom mold are merged, and finally move the upper mold and / or the bottom mold. Insert the steel foot clamp into the positioning hole and merge the upper mold and the middle mold. or After steps (1) and (2), move the left and right parts in opposite directions, merge the middle mold first, then move the upper mold and / or the bottom mold, and finally merge the upper mold with the middle mold and the middle mold with the bottom mold. (4) Injection and vulcanization: Inject silicone rubber into the mold cavity after mold closing in step (3), and then vulcanize it; (5) Mold opening: After the vulcanization in step (4) is completed, move the upper mold and / or the bottom mold first. The upper mold and the middle mold are separated. The lifting frame drives the middle mold and the bottom mold to separate. After the middle mold is separated from the upper end of the flange and the convex ring of the bell-shaped insulator, move the left and right parts in opposite directions, open the middle mold, take out the covered bell-shaped insulator, and complete the covering of the bell-shaped insulator.

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