In the process of developing the National HT--7U device for the National Science Project of the Chinese Academy of Sciences, another unit technology was developed, which is a four-gun special sand blasting machine for armored conductors. The blasting test conducted recently showed that the blasting machine has reached the safety requirements and filled the gap in this aspect in China. The purpose of the blasting process is to roughen the surface of the armored conductor to increase the mechanical strength after vacuum pressure impregnation. A sandblasting machine with a single-gun structure requires 4 manual operations for each device to blast and stop the conductor winding. This four-gun special sand blasting machine with independent intellectual property rights has four spray guns on-line operation, which can realize on-line automatic sand blasting, completely eliminating the influence of surface blasting on the conductor winding, and the work efficiency is improved by 30% to 40. %. Not only saves manpower, but also reduces dust pollution. It is expected that after the winding of various conductors of the HT--7U device is completed, the cost can be reduced by nearly one million yuan.
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