The method of obtaining a solid defensive ribbed coating for polymer insulators

 

(57) Abstract:

The invention relates to electrical engineering, in particular to the production technology insulators for the electrical industry. The method consists in installing a coaxial outer tube and inner element in the form of a pipe or rod, and then between them consistently stack detachable liners and procurement of raw silicone rubber. Press up until the point of these liners. The vulcanization lead in two stages: pre - press-form and final - product after extraction from the mold. 3 Il.

The invention relates to electrical engineering, in particular to the production technology insulators for the electrical industry.

A known method of manufacturing bellows PTFE carried out by sintering of pellets pressed from a powder and having an annular shape, in a special form with detachable metal liners and rings. Rings are involved in the design of the outer part of the product, the liners of the fusible alloy or plaster are used to design the internal parts. After product manufacturing gypsum liners are dissolved in hot water, and rings are removed [1]

In itaway rubber, selected for the prototype, when the mold is filled with the required amount of rubber [2]

This coating to form the mold consisting of two half-form, in which the fixed half. The mold is filled under pressure with liquid rubber, stand at room temperature until curing of the rubber, i.e. until the end of the curing process, the coating is removed from the mold.

The disadvantage of this method is the necessity of using a special type of rubber, the cost is quite high, in addition, according to CIGRE experience has shown that this rubber does not have a sufficiently high erosion resistance of the surface of the product.

The purpose of the invention improve the quality of the protective coating and reduce the cost of the final product.

The proposed method of producing a solid defensive ribbed coating of silicone rubber polymer insulators is as follows.

Install vertical outer tube and the inner dielectric load-bearing element. Then between them consistently stack detachable liners and procurement of raw silicone rubber. Press the product after removal from the mold.

In Fig. 1 shows a mold with cavities filled with work before compression; Fig.2 is the same, after compression; Fig.3 finished floor.

Mold consists of an outer tube 1 which is made from a durable material such as steel. It has 2 holes to remove excess rubber and its fixation. The internal element (pipe, the cylinder 3 may be made of metal or dielectric support member, such as fiberglass. Between them there are a number of inserts: narushenie upper 4 and lower 5 and plug 6. Educated liners cavity filled silicone rubber 7.

When performing mold can change the dimensions of the cylinders, shape, number and size of inserts for a given coating 8.

Example. On the Desk is installed vertically outer tube of the mold 1 and the inner bearing element, for example, fibreglass cylinder 3. Then put the inserts 5, 6, 4, and procurement of raw silicone rubber 7, pre-profilirovannye, with the excess volume of the future of the protective coating up to 10% On the lower shell 4 is installed a cylindrical punch or instead of the upper liner pokrytie 8.

The number of inserts corresponds to the specified number of edges of the protective coating and the amount of the formed protective coatings in one of the mold.

The mold is transferred into the working area of the press. After compression mold before closing all the bearings (Fig. 2) and flows out of the abundance of raw rubber through a special process vents 9, 10, 2 vapory, the number, size and location of which should ensure that the excess rubber, while maintaining the desired density of the resulting coating, the position of the punch is fixed by screws 11 screwed into the threaded holes 12 in the outer tube 1, the recording is the result of the setting of the screw head 11 in the annular groove 13 of the punch. Produce heating the mold to a temperature of 120oC for 20 min-the first stage of vulcanization. After that, the screw - clamps 11 turn, the mold is dismantled. Thus obtained pre-vulkanisierung product release liners from 4-6 and transferred to the final vulcanization in an oven with a temperature of 160-200oC, where stand 6-12 hours

In the proposed method of obtaining ribbed cover, you can use metallic element in the form of a pipe element had the base and the end of cylindrical form, and the middle part in the form of a truncated cone. With this solution, the rubber coating may be seated in the dielectric load-bearing element (GRP pipe or rod) with the same taper using sealant between the rubber covering and the bearing element.

To simplify the technological process it is better to use the internal dielectric load-bearing element, for example, fiberglass. And the result will be on the fiberglass hull formed a protective coating with a guaranteed quality clutch. In the case of compound dielectric support member (FRP) with protective ribbed coating of silicone rubber by nozzles of the latter with the help of adhesive sealant, the formation of air inclusions, which degrades the quality of the product.

The proposed method for coating allows to obtain high quality solid protective ribbed cover height, external and internal diameters by varying the dimensions of the outer pipe, the inner element, as well as the size, shape and number of refills.

The cost of silicone rubber used in the proposed method, snakeye for fiberglass insulators, when the mold having separable parts and the inner cylindrical element, is filled with organic material and carry out the vulcanization of the material, characterized in that use the mold is formed of two coaxially arranged cylinders and placed in the gap between the liners, the top and bottom of which are made permanent, and the intermediate split, as the organic material used raw organic silicon rubber and fill the mold with an organic material by a consistent set of detachable liners, and pieces of raw silicone rubber, is pressed workpiece to the clamping inserts and conduct preliminary vulcanization in the mold, then the mold is cooled and removed from the product, followed by a final cure.

 

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