Novel processing technique of paper board cylinder

Abstract

The invention relates to a novel processing technique of a paper board cylinder, belonging to the technical field of manufacturing of an ultrahigh voltage and high capacity transformer. The technicalscheme comprises the following steps: blanking, meichen the extra toe of a donkey, vacuum-drying, molding, xunchen extra toe of the donkey, vacuum-drying and then spraying oil. As all insulating partsare immersed in the transformer oil when being used for an oil immersed transformer, the transformer oil does not have any influence to the performance of an insulating cylinder; and but the transformer oil can effectively block humidity from invading the paper board, thus avoiding the paper cylinder from absorbing moisture and expanding in the processes of storage and use. The novel processing technique has the beneficial effects of: guaranteeing manufacturing size of the paper cylinder, avoiding the size change of the paper cylinder in the storage and use, and meeting the requirements of the ultrahigh voltage and high capacity transformer to the paper board cylinder.

Description

Technical field: [0001] The invention relates to a novel cardboard cylinder processing technology, which belongs to the technical field of ultra-high voltage and large-capacity transformer manufacturing. Background technique: [0002] Ultra-high voltage, large-capacity transformer coil cardboard tube is usually a cylinder surrounded by 3~6mm thick insulating cardboard with a diameter of 500~1800mm. It is mainly used for the innermost coil of the transformer. During the operation of the transformer, it plays a role in supporting the coil. Function, improve the mechanical strength and short-circuit resistance of the coil. In the use of cardboard tubes, the diameter requirements are very strict, and the insulating cardboard used to make cardboard tubes is a loose fiber structure, which is easy to absorb moisture in the air and cause dimensional changes. This characteristic has caused cardboard tube production, A difficult problem in the process of storage and use: (1) When mak...

AI Technical Summary

Problems solved by technology

In the use of cardboard tubes, the diameter requirements are very strict, and the insulating cardboard used to make cardboard tubes is a loose fiber structure, which is easy to absorb moisture in the air and cause dimensional changes. This characteristic has caused cardboard tube production, A difficult problem in the process of storage and use: (1) When making a cardboard tube, the cardboard needs to be surrounded into a paper tube. This process needs to be dried to ensure the shape, and the shrinkage of the cardboard during drying is related to the content of the cardboard itself. The amount of water has a lot to do with it, it is difficult to determine the actual amount of shrinkage, so it is difficult to guarantee the diameter after drying

(2) It is difficult to ensure that the finished paper tube can be used on the coil immediately, and it needs to be stored for a certain period of time. During the storage process, the paper tube is easy to be damp and cause the size to increase

This method has a poor control effect on the diameter of the cardboard tube, and it is difficult to meet the requirements of ultra-high voltage and large-capacity transformers for cardboard tubes