A method of manufacturing a tubular insulators

 

The invention relates to the field of electrical engineering, and in particular to methods for manufacturing insulators or insulating phone Method of manufacturing a tubular insulators includes a winding on a mandrel binder impregnated fabric. Previously, the fabric is dried at a temperature of 120-150C, then placed in a vacuum chamber at a pressure of 10-3-10-2mm RT. century to complete obezvozhivanija, then the chamber is filled with an adhesive prepared fabric is wound on the mandrel, and then the product is subjected to heat treatment for curing the bonding material. When the winding on the mandrel cloth pressed to her freely rotating roller. Wound tissue can be produced in two layers or more. The technical result of the invention is the possibility of obtaining a tubular insulators of any transverse and longitudinal dimensions with high mechanical and electrical strength through the use of coiling fabric with multiple rolls at full electrical isolation joints. 2 C.p. f-crystals, 3 ill.

The invention relates to the field of electrical engineering, in particular to the major items of electrical equipment, and in particular to methods shotline the roving impregnated before laying epoxy composition. The method has several disadvantages: complexity of the equipment, low productivity high speeds of movement of the roving in the epoxy composition, which leads to porosity of the product and a low electric strength (D. C. Rosato, K. S. grove. The wound fiber glass. - M.: Mashinostroenie, 1969, S. 12-46).

There is a method of winding cylinders glass, which has the same drawbacks as in the previous case (although the performance is higher), and large waste pipe through the marginal areas associated with the change of direction of the pickup tape on a rotating mandrel. In addition, glass is more expensive than glass roving in production (A. A. Shevchenko, P. C. Vlasov. Layered plastics in chemical apparatus and pipelines. - M.: Mashinostroenie, 1971, S. 21-76).

There is a method of winding a cloth pre-impregnated with epoxy compound. The advantage of this method compared to previous ones is the possibility of winding with a relatively low speed, because the length of the pipe corresponds to the width of the fabric. Another advantage of this method is the provision of a small waste pipe at its ends. Eliminates the need is Yu winding device (centuries Baranovsky, G. M. Dulitzky. Layered plates for electrical purposes. - M.: “Energy”, 1976 - prototype).

A significant disadvantage of this method is the impossibility of making pipes, the greater the width of the fabric. Winding cloth end-to-end to extend the length of the pipe is not valid in connection with the formation at the interface of the site with a low mechanical strength, which is determined by the strength of the binder. Wound tissue overlap leads to the formation of local swelling, voids in the pipe and folds wound tissue, resulting in lower electric strength spooled pipe.

This invention eliminates the drawbacks and prototype.

The technical result of the invention to provide a homogeneous mass of the isolator of any desired length and thickness, regardless of the width of the fabric with a given winding density and provision of overlap joints of the strips of one layer of fabric adjacent layers, which improves the electrical and mechanical strength of the product as a whole and the performance of manufacturing insulators.

The technical result is achieved in that in the method of manufacturing a tubular insulators by winding on a mandrel pre-impregnated fabric binder material, and temperature 120-150C, then placed in a vacuum chamber at a pressure of 10-2-10-3mm RT. century to complete obezvozhivanija fabric, synchronizing the time rewind fabric with roll-to-roll, then the chamber is filled with an adhesive to its impregnation with rewinding prepared fabric is wound on the mandrel, and then the product is subjected to heat treatment for curing the bonding material. When the winding on the mandrel cloth pressed to her freely rotating roller.

Winding long products are produced in two layers and more, and the band of tissue located on the mandrel butt, and in each layer the fabric shifted part of the fabric width equal to the width of the fabric, divided by the number of layers.

According to the invention the fabric of the required size (width and length) is first subjected to a heat treatment at a temperature of 120-150With the removal from it of moisture (drying). Then roll the dried fabric is placed in a vacuum-impregnating chamber, where the first under vacuum (10-3-10-2mm RT. Art.) is removed from the fabric of the air, and then is impregnated fabric binder (epoxy composition, liquid silicone rubber, etc.,). Moreover, the evacuation and impregnation are made in the process posledovati fabric is removed from the chamber, tightly wrapped with plastic film and placed for storage in a refrigerator at a temperature of 2-5From where it can be stored using the composition of hot curing agent at least one week.

As necessary, soaked roll of tissue is removed from the refrigerator and placed on a filament winding machine. On reeling machine impregnated fabric is rewound from the roll on the mandrel, the outer diameter of which corresponds to the inner diameter of the product. Wrap the fabric is pressed against the mandrel roller, pressed against the fabric spring or cargo in order to provide a preselected winding density and remove excess epoxy composition.

After reaching the required thickness of the winding drive of the mandrel is turned off (automatically or manually), wrap the fabric is cut from the roll of impregnated cloth. Product wrapped around the film of heat-resistant material having no adhesion to the epoxy resin (such as PTFE), then the product is removed from the winding machine and placed in a heat chamber to ensure the polymerization of the binder. After completion of the polymerization, the product is recovered from the heat chamber and sent for mechanical obrabotki) layer (sunset), the fabric in one layer is shifted relative to another (the other) half of the width of the fabric (or part of the width of the fabric equal to the width of the fabric, divided by the number of layers (visits)). In this case, for one revolution of the mandrel is wound two (or more) layer, which significantly speeds up the winding process, increases the mechanical strength against bending, tension and compression products.

The invention is illustrated in Fig.1, 2A and 2B. In Fig.1 illustrates a winding tubular insulator length equal to twice the width of fabric (top view) 1 - frame; 2, 3 - band fabric one layer; 2', 3' - bobbin-soaked cloth; 4, 5, 6 - band fabric of the second layer; 4', 5',6' - bobbin with a soaked cloth.

The mandrel 1 are laid out end-to-end two strips of fabric 2, 3, coiled with two rolls 2', 3'. On top of this first layer of fabric is laid a strip of fabric the same width 4 in such a way that the junction of the fabric of the first layer is in the middle of the strip of fabric of the second layer. Complemented by a second layer of strips of fabric 5 and 6, the half width of the butt to the middle zone of the second layer. These two intersection coincide with the middle of the strips 2 and 3 of the first layer. During rotation of the mandrel 1 one turn, these two intersection will be blocked lanes 2 and 3 fabric of the first layer. When this strip is overall technique of coiling. In Fig.2B is a view along arrow A.

The mandrel 1 is rotated to get the pipe of the desired thickness. The rate of increase of thickness greater than with the single winding cloth, because each part of the pipe leaves the two (or more) coils (Fig.2A). In this case, there will be no local swelling, no folds, no voids in the winding. Therefore, neither electrical nor mechanical strength will not be less than the usual winding cloth.

This way you can get a tube of infinite length. It is possible that the fabric rolls that are wound on the mandrel, can be pre-impregnated with epoxy composition under vacuum or without vacuum), and the impregnation can be carried out while moving the fabric from the roll on the mandrel by dipping epoxy composition, followed by “rubbing” it in a fabric that with one, on the other hand the system is non-rotating shafts with removal of excess binder.

Claims

1. A method of manufacturing a tubular insulators by winding on a mandrel pre-impregnated fabric binder material, and the diameter corresponds to the inner diameter of the insulator, characterized in that the fabric is pre-dry it is-2mm RT.article to complete obezvozhivanija, then the chamber is filled with an adhesive to its impregnation with rewinding prepared fabric is wound on the mandrel, and then the product is subjected to heat treatment for curing the bonding material.

2. A method of manufacturing a tubular insulators under item 1, characterized in that the winding on the mandrel cloth pressed to her freely rotating roller.

3. A method of manufacturing under item 1 or 2, characterized in that the winding fabric produced in two or more layers, having a band of tissue located back to back, and each layer of fabric is shifted part of the fabric width equal to the width of the fabric, divided by the number of layers.

 

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