SU792319A1 - Method of manufacturing electroinsulation articles - Google Patents

Description

The invention relates to a technology for the manufacture of electrical insulating products of transformers and can be used in the electrical industry.

There is a method of manufacturing insulating rings, according to which square blanks are cut from sheets of insulating cardboard, washers are cut from them and glued to the outer thickness [1].

However, in the manufacture of insulating rings according to the specified technology, 40-50% of the electrical insulation board goes to waste, which is a disadvantage of this method. ‘

There is also a method of manufacturing electrical insulating products by spiral winding on the edge of a blank of tape made of insulating material [2].

This technical solution is the closest to the invention in technical essence and the achieved result.

The disadvantage of this method is that the rings made of strips with sawtooth grooves have low mechanical and electrical strength, since when the strip is bent, the outer grooves expand and form voids in the ring. In the manufacture of sawtooth grooves, part of the cardboard goes to waste.

In addition, the cost of processing the ring increases, since the glued ring after winding has the shape of a polygon.

The aim of the invention is to increase the mechanical strength and save electrical insulation material.

The goal is achieved by the fact that before winding onto the rib, the tape is corrugated, the spiral is formed by rolling the rollers of one of the tape edges in width, and between the turns of the rolled surfaces, an additional spiral from the tape of a smaller width is laid flush with the outer diameter, é20 prepared using the same technology.

In FIG. 1 shows a device for manufacturing a ring; in FIG. 2 same side view.

The manufacture of electrical insulation products is carried out in the following sequence. The blank of tape 1 of insulating material, previously coated with varnish, is fed into the rotating gears 2, where corrugation is performed, then the corrugated blank 3 passes between the rotating rollers 4, which roll the corrugations of one of the edges of the tape in width, as a result of which the strip bends around the circumference in a spiral and on a rotating table 5 between the stops b, winding is carried out by winding the ring 7 to a predetermined number of turns.

The diameter of the bend of the tape 1 depends on the width of the rolled corrugations. With an increase in the width of the seaming, the diameter of the spiral decreases, and with a decrease in the width of the seaming, the diameter of the spiral increases.

After winding the billet tape 1, its thickness along the inner diameter is greater than the thickness on the outer diameter. To eliminate the thickness of the ring 7 between the turns of the rolled surfaces, an additional spiral is laid, made according to the proposed technology from a tape of a smaller width.

Then, technological bandages are applied to the ring blank 7, glued, bandages removed and processed! outer and inner surfaces.

EFFECT: invention increases mechanical strength and saves insulating material due to preliminary corrugation of a tape blank from insulating material.

Claims (3)

Claim 5 A method for the manufacture of electrical insulating products by spiral winding onto a rib a blank of tape from an insulating material, which requires that, in order to increase In order to reduce mechanical strength and save insulating material, before winding onto the rib, the tape is corrugated, a spiral is formed by rolling with rollers of one of the edges of the tape along (5 widths, and between the turns of the rolled surfaces they are laid flush with the outer diameter of the spiral an additional spiral from a tape of a smaller width made according to the same tech2Q nology.