A bell-shaped composite insulator coating device

Abstract

This invention discloses a coating device for bell-shaped composite insulators, belonging to the technical field of insulator coating. It involves installing coating molds on the upper and lower heating chambers of a vulcanizing machine. The coating molds are characterized by: an upper mold, a middle mold, and a bottom mold that can be assembled sequentially from top to bottom, forming a mold cavity. The bottom mold has a steel cap insertion hole communicating with the mold cavity, and the upper part of the steel cap insertion hole has a stepped platform. The upper mold has a positioning hole communicating with the mold cavity, and a steel foot clamp is inserted into the positioning hole. 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 device enables mechanized 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 device 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 device for bell-shaped composite insulators, which can realize the mechanized coating of bell-shaped insulators and improve the coating quality.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A coating device for a bell-shaped composite insulator is designed, including a vulcanizing machine. The upper part of the fluidizing machine is equipped with an upper heating box, and the lower part is equipped with a lifting platform. A lower heating box is located in the lifting platform. Coating molds are installed on the upper and lower heating boxes. The coating mold comprises an upper mold, a middle mold, and a bottom mold that can be sequentially assembled from top to bottom. The upper mold is installed in the upper heating box, and the lower mold is installed in the lower heating box. The molds together form a mold cavity, which includes a flange disk cavity and a raised cavity. The bottom mold and the middle mold form the flange disk cavity, and the upper mold can extend into the middle mold. The upper mold and the middle mold form a raised cavity, which is connected to the flange disk cavity. The flange disk cavity is connected to the injection hole, which is connected to the injection machine. 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 outside through the upper heating box. A steel foot clamp is inserted into the positioning hole.

[0007] 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;

[0008] 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 left split and the right split are respectively connected to a push-pull mechanism.

[0009] 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.

[0010] 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.

[0011] Preferably, the lower part of the positioning hole is flared from top to bottom.

[0012] 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.

[0013] Preferably, the groove is an annular groove and the protrusion is an annular protrusion.

[0014] 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.

[0015] 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.

[0016] Preferably, the bottom mold is connected to a second lifting mechanism, the first lifting mechanism is an elastic body or a hydraulic cylinder, and the second lifting mechanism is a hydraulic cylinder.

[0017] 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.

[0018] Preferably, it also includes an ejection mechanism, which is fixedly installed relative to the bottom mold and can extend into the steel cap insertion hole along the axial direction of the steel cap insertion hole.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this invention, a bell-shaped insulator is placed in a mold cavity. The injected silicone rubber is fluidized onto the insulator at high temperature through upper and lower heating boxes. Under pressure, the adhesion strength of the silicone rubber is further enhanced, strengthening its integrated structure with the insulator. After encapsulation and 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. This allows the middle mold to rise above the flange of the insulator before moving on the lifting frame, completing the opening of the middle mold and freeing it from the constraint of the insulator, thereby realizing the mechanized encapsulation of the bell-shaped insulator.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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 mechanized wrapping 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

[0029] Figure 1 This is a schematic diagram of the structure of the present invention;

[0030] Figure 2 yes Figure 1 View from direction A;

[0031] Figure 3 This is a schematic diagram of the three-dimensional exploded structure of the covering mold;

[0032] Figure 4 yes Figure 3 View from direction B;

[0033] Figure 5 yes Figure 4 CC section view;

[0034] Figure 6 yes Figure 3 The D-direction view;

[0035] Figure 7 This is a schematic diagram of the usage state of the present invention;

[0036] Figure 8 yes Figure 7 A magnified view of part I in the middle.

[0037] The diagram shows: 1. Vulcanizing machine; 1-1. Upper heating box; 1-2. Lower heating box; 1-3. Lifting platform; 2. Covering mold;

[0038] 2-1. Upper mold; 2-2. Right split body; 2-3. Left split body; 2-4. Mold cavity; 2-5. Flange plate cavity; 2-6. Protruding cavity; 2-7. Parasol wing cavity; 2-8. Bottom mold; 2-9. Elastic support body; 2-10. Guide rail; 2-11. Centering block; 2-12. First slider; 2-13. Second slider; 2-14. Second limiting block; 2-15. First limiting block; -16, Annular groove; 2-17, Annular protrusion; 2-18, Insert block; 2-19, Positioning hole; 2-20, Steel cap insertion hole; 2-21, Ladder platform; 2-22, First part; 2-23, Second part; 2-24, Nut; 2-25, Screw; 2-26, End block cavity; 2-27, Insertion port; 3, Push-pull mechanism; 4, Glue injection machine; 5, Ejection mechanism; 6, Insulator; 6-1, Steel cap; 6-2, Steel foot. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0040] 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 mold cavity 2-4 is defined as the inner side, and the side furthest from the center of mold cavity 2-4 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.

[0041] like Figure 1 and Figure 2 As shown, in this invention, the vulcanizing machine 1 has an upper heating box 1-1 at its upper part and a lifting platform 1-3 at its lower part. The lifting platform 1-3 contains a lower heating box 1-2. A covering mold 2 is installed on both the upper heating box 1-1 and the lower heating box 1-2. Figure 3 and Figure 4 As shown, the covering mold 2 is equipped with an upper mold 2-1, a middle mold, and a bottom mold 2-8 that can be assembled together from top to bottom. The upper mold 2-1 is installed in the upper heating box 1-1, and the lower mold is installed in the lower heating box 1-2. The bottom mold 2-8 is raised and lowered by the lifting platform 1-3, allowing the upper mold 2-1 and the bottom mold 2-8 to rise and fall relative to each other, thus completing the mold opening and closing. Figure 5 As shown, the upper mold 2-1, middle mold, and bottom mold 2-8 together form a mold cavity 2-4. The mold cavity 2-4 contains a flange disc cavity 2-5 and a raised cavity 2-6. The bottom mold 2-8 and the middle mold form the flange disc cavity 2-5. The upper mold 2-1 can extend into the middle mold. The upper mold 2-1 and the middle mold form the raised cavity 2-6, which connects to the flange disc cavity 2-5. This arrangement ensures that the mating surface of the bottom mold 2-8 and the middle mold is located at the outermost end of the flange disc cavity 2-5, and the mating surface of the middle mold and the upper mold 2-1 is located at or above the top of the raised cavity. The flange disc cavity 2-5 connects to a glue injection hole, which is connected to a glue injection machine 4. The bottom mold 2-8 has a steel cap insertion hole 2-20 that connects to the mold cavity 2-4. The upper part of the steel cap insertion hole 2-20 has a ladder 2-21. This structure provides sufficient space for the steel cap 6-1 to be inserted into the lower part of the steel cap insertion hole 2-20, while also supporting the steel cap 6-1 via the ladder 2-21. The upper mold 2-1 has a positioning hole 2-19. One end of the positioning hole 2-19 connects to the mold cavity 2-4, and the other end connects to the outside through the upper heating box 1-1. The lower part of the positioning hole 2-19 is flared from top to bottom. A steel foot clamp is inserted into the positioning hole 2-19, allowing the bottom mold 2-8 to support the entire insulator 6 by supporting the steel cap 6-1. Under its own weight, the steel foot clamp is located near the lower part of the insulator, which prevents the steel foot clamp from being fully engaged in the positioning hole 2-19. That is, a gap is formed between the steel foot clamp and the side wall of the positioning hole 2-19. On the one hand, the air in the mold cavity 2-4 can leak out through this gap, reducing the injection resistance of the silicone rubber and facilitating the uniform distribution of the silicone rubber in the mold cavity 2-4. The pressure of the mold cavity 2-4 also enhances the adhesion between the silicone rubber and the insulator. On the other hand, it allows the upper part of the insulator 6 to have a certain range of movement space, which can prevent the mold from locking the insulator 6. This allows the insulator 6 to be uniformly covered while avoiding the porcelain damage rate caused by locking.

[0042] To enhance the creepage distance of insulator 6, such as Figure 5As shown, the coating mold 2 is provided with a wing cavity 2-7 that connects to the mold cavity 2-4. The mating surface of the upper mold 2-1 and the middle mold is located at the outermost end of the wing cavity 2-7. This allows for the fluidization of the coating layer on the insulator while simultaneously preparing a silicone rubber wing integral with the coating layer, increasing the creepage distance of the insulator 6 and improving the overall safety of the insulator 6. The wing cavity 2-7 is designed to be inclined outward from bottom to top, and the outer end of the wing cavity 2-7 does not extend beyond the outer end of the mold cavity 2-4. 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 extend beyond 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.

[0043] The present invention has a gantry-type lifting frame installed on the bottom mold 2-8, such as Figure 4 and Figure 6As shown, the lifting frame specifically uses guide rail 2-10 as a crossbeam. Both ends of guide rail 2-10 are connected to elastic support body 2-9. The elastic support body 2-9 can adopt a structure in which an elastic body is installed in a cylinder and a telescopic rod is connected to the elastic body. Then, a first slider 2-12 and a second slider 2-13 are installed on guide rail 2-10. The middle mold is designed as a horizontally distributed left split 2-3 and right split 2-2. The first slider 2-12 is set on the left split 2-3 and the second slider 2-13 is set on the right split 2-2. A centering block 2-11 is also provided on the bottom mold 2-8, a first limiting block 2-15 is provided on the left split body 2-3, and a second limiting block 2-14 is provided on the right split body 2-2. The first limiting block 2-15 can abut against the left side wall of the centering block 2-11, and the second limiting block 2-14 can abut against the right side wall of the centering block 2-11. When the first limiting block 2-15 and the second limiting block 2-14 abut against the centering block 2-11, the left split body 2-3 and the right split body 2-2 come together, completing the mold closing of the middle mold. In this way, the centering block 2-11 limits the mold closing position of the left split body 2-3 and the right split body 2-2, ensuring the mold closing position of the left split body 2-3 and the right split body 2-2 relative to the bottom mold 2-8, thus improving the mold closing quality. Of course, besides using a gantry-type lifting frame composed of guide rail 2-10 and the first lifting mechanism, other lifting frames with specific structures can also be used, as long as the left split 2-3 and right split 2-2 can be slidably installed on the lifting frame and can be lifted and lowered by the lifting frame. No specific requirements are placed on their structure. Push-pull mechanisms 3 are also connected to the left split 2-3 and right split 2-2 respectively. Specifically, push-pull mechanisms 3 are hinged to the left split 2-3 and right split 2-2 respectively. The other end of the push-pull mechanism 3 is hinged to the extension plate of the bottom mold 2-8. The push-pull mechanism 3 can be a hydraulic cylinder or a pneumatic cylinder, or other telescopic mechanisms that can convert rotational motion into translational motion. When a hydraulic cylinder or pneumatic cylinder is used, the telescopic rod is hinged to the left split 2-3 and right split 2-2, and the cylinder is hinged to the extension plate of the bottom mold 2-8. Thus, the pitching and tilting of the hydraulic cylinder or pneumatic cylinder during the hinged rotation meets the lifting and lowering requirements of the middle mold. The push-pull mechanism can also be fixedly installed on the lifting frame, which can realize the push-pull operation of the left split 2-3 and the right split 2-2.

[0044] To prevent the molds from shifting under external forces such as injection pressure after mold closing, such as... Figure 3 and Figure 5As shown, the present invention also provides a first locking mechanism between the middle mold and the bottom mold 2-8, and a second locking mechanism between the upper mold 2-1 and the middle mold. Specifically, the first locking mechanism has an annular groove 2-16 on the top wall of the bottom mold 2-8 located on the outer periphery of the mold cavity 2-4, and an annular protrusion 2-17 on the bottom wall of the middle mold, the annular protrusion 2-17 being fitted into the annular groove 2-16; the second locking mechanism has four inserts 2-18 on the top wall of the middle mold, the four inserts 2-18 being located on the outer periphery of the mold cavity 2-4 and evenly distributed along the circumference of the mold cavity 2-4, and four insertion holes on the bottom wall of the upper mold 2-1, the inserts 2-18 being inserted into the insertion holes one by one. Of course, the annular groove 2-16 can also be formed on the bottom wall of the middle mold, and the annular protrusion 2-17 can be set on the top wall of the upper mold 2-1. This can also achieve the plug-in locking between the upper mold 2-1 and the middle mold. The groove does not have to be annular. However, using an annular groove 2-16 can make the insertion part evenly stressed, thereby increasing the withstand capacity of the first locking mechanism and extending its service life. Similarly, the insertion block 2-18 can also be set on the bottom wall of the upper mold 2-1, 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 2-1 and the middle mold, and between the middle mold and the bottom mold 2-8. There are no specific requirements for their structure.

[0045] To facilitate the installation and removal of the steel foot clamp on steel foot 6-2, such as Figure 8 As shown, the steel foot clamp used in this invention adopts a split structure, namely, it consists of a first split 2-22 and a second split 2-23. The first split 2-22 can be connected with the second split 2-23 to form an end block cavity 26. The bottom wall of the steel foot clamp has an insertion port 2-27 communicating with the end block cavity 26, and the upper end has a half-screw. The two half-screws together form a screw 2-25, and a nut 2-24 is fitted on the screw 2-25. 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 2-22 and the second split 2-23 can be detachably connected. In this way, the first split 2-22 and the second split 2-23 can be combined and connected together by the nut 2-24, that is, the half-screw serves as the connecting part, and the nut 2-24 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 6-2 after it is installed on the steel foot 6-2.

[0046] To facilitate the demolding of insulator 6, such as Figure 7As shown, the present invention also includes an ejection mechanism 5 that extends from bottom to top into the steel cap insertion hole 2-20, allowing the ejection mechanism 5 to extend axially into the steel cap insertion hole 2-20. Specifically, a through hole can be pre-drilled in the lower heating box 1-2, and then the ejection mechanism 5 can be installed on the lifting platform 1-3. The telescopic rod of the ejection mechanism 5 can pass through the through hole and enter the steel cap insertion hole 2-20 to push the steel cap 6-1, thereby allowing the covered insulator 6 to detach from the bottom mold 2-8 for easy removal. Alternatively, an extension section can be provided on the lifting platform 1-3, with a slide rail on the extension section. The bottom mold 2-8 is slidably mounted on the slide rail, and the ejection mechanism 5 is installed on the extension section. After the bottom mold 2-8 moves to the position of the ejection mechanism 5, the ejection mechanism 5 extends into the steel cap insertion hole 2-20 to perform the ejection operation. The ejection mechanism 5 can be a cylinder or a mechanism that can convert rotational motion into lifting motion.

[0047] The working process of this invention is as follows:

[0048] The lifting platform 1-3 is located at the lower part of the vulcanizing machine 1. That is, when the vulcanizing machine 1 is in the initial state, the first part 2-22 of the steel foot clamp is placed on one side of the steel foot 6-2 in the insulator 6, and the second part 2-23 is placed on the other side of the steel foot 6-2. The steel foot end block is located in the end block cavity 26. After the first part 2-22 and the second part 2-23 are combined, the steel foot end block is located in the end block cavity 26. The rod part of the steel foot 6-2 extends out from the insertion port 2-27. Then, the nut 2-24 is screwed onto the screw 2-25 formed by the combination of the first part 2-22 and the second part 2-23. In this way, the steel foot clamp is installed on the steel foot 6-2 of the insulator 6. Then, invert the insulator 6 and insert the steel cap 6-1 of the insulator 6 into the steel cap insertion hole 2-20. The ladder platform 2-21 supports the steel cap 6-1. Then, start the push-pull mechanism 3, so that the first slider 2-12 and the second slider 2-13 drive the left split body 2-3 and the right split body 2-2 to move towards each other until the first limiting block 2-15 on the left split body 2-3 and the second limiting block 2-14 on the right split body 2-2 respectively abut against the center stop block 2-11, so that the left split body 2-3 and the right split body 2-2 are joined together, and the middle mold is merged. Start the lifting platform 1-3, drive the bottom mold 2-8 to rise, insert the steel foot clamp into the positioning hole 2-19, and the elastic support body 2-9 is compressed. The middle mold and the bottom mold are merged together on the upper mold 2-1. Start the injection machine 4 to inject silicone rubber into the mold cavity 2-4, and then fluidize it at high temperature. After fluidization is complete, start the lifting platform 1-3 again to lower the bottom mold 2-8, so that there is a certain space between the upper mold 2-1 and the bottom mold 2-8, allowing the elastic support 2-9 to detach from the bottom mold 2-8 along with the upper mold 2-1. At the same time as the upper mold 2-1 separates from the middle mold, the middle mold separates from the bottom mold 2-8. After the middle mold detaches from the upper end of the flange of the insulator 6, start the push-pull mechanism 3 again to separate the left split 2-3 and the right split 2-2, open the middle mold, start the ejection mechanism 5, and push the steel cap 6-1 upward to separate the insulator 6 from the bottom mold 2-8. Take out the covered insulator 6 to complete the covering of the insulator 6.

[0049] In addition to using the aforementioned elastic support 2-9 as the first lifting mechanism, telescopic components such as cylinders and hydraulic cylinders can also be used to lift the guide rail 2-10. When using a hydraulic cylinder or a cylinder, the left split body 2-3 and the right split body 2-2 move in opposite directions, first merging the middle mold, then lowering the middle mold so that the middle mold merges with the bottom mold 2-8, and finally moving the bottom mold 2-8. The steel foot clamp is inserted into the positioning hole 2-19, and the upper mold 2-1 merges with the middle mold. When opening the mold, the upper mold 2-1 is moved first, separating the upper mold 2-1 from the middle mold. The cylinder or hydraulic cylinder drives the middle mold to separate from the bottom mold 2-8. After the middle mold is separated from the upper end of the convex ring in the insulator 6, the left split body 2-3 and the right split body 2-2 move in opposite directions to open the middle mold.

[0050] 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 coating device for a bell-shaped composite insulator, comprising a vulcanizing machine, an upper heating box at the top of the vulcanizing machine, a lifting platform at the bottom, a lower heating box in the lifting platform, and coating molds mounted on the upper and lower heating boxes, characterized in that: The encapsulation mold includes an upper mold, a middle mold, and a bottom mold that can be assembled together from top to bottom. The upper mold is installed in an upper heating box, and the lower mold is installed in a lower heating box. The upper mold, middle mold, and bottom mold together form a mold cavity, which includes a flange disc cavity and a protruding cavity. The bottom mold and the middle mold form the flange disc cavity, and the upper mold can extend into the middle mold. The upper mold and the middle mold form the protruding cavity, which is connected to the flange disc cavity. The flange disc cavity is connected to the injection hole, which is connected to the injection machine. 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 outside through the upper heating box. A steel foot clamp is inserted into the positioning hole. 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; The bottom mold is equipped with a lifting frame. 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. The bottom mold is provided with a centering block. The left split is provided with a first limiting block and the right split is provided with a second limiting block. 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 left split and the right split are respectively connected to a push-pull mechanism. The lifting frame includes a crossbeam and a first lifting mechanism located at both ends of the crossbeam. The left and right parts are slidably mounted on the crossbeam. The crossbeam is a guide rail, and a first slider and a second slider are mounted on the guide rail. The first slider is located on the left part, and the second slider is located on the right part. 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. 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 correspondingly provided on the bottom mold and the middle mold. The lower part of the positioning hole is flared from top to bottom; Under its own weight, the steel foot clamp forms a gap with the side wall of the positioning hole, allowing air in the mold cavity to leak out. This provides space for the upper part of the insulator to move, preventing the mold from locking up the insulator.

2. The covering device for the bell-shaped composite insulator according to claim 1, characterized in that: The groove is an annular groove, and the protrusion is an annular protrusion.

3. The covering device for the bell-shaped composite insulator according to claim 1 or 2, 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.

4. The covering device for the bell-shaped composite insulator according to claim 1 or 2, characterized in that: 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 connects to the end block cavity, and the upper end has a connecting part with a connecting piece.

5. The covering device for the bell-shaped composite insulator according to claim 1 or 2, characterized in that: It also includes an ejection mechanism, which is fixedly installed relative to the bottom mold and can extend into the steel cap insertion hole along the axial direction of the steel cap insertion hole.

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