Method for detecting insulation weaving quality of superconducting wire by weight of woven layer

Abstract

The invention provides a method for detecting the insulation weaving quality of a superconducting wire by the weight of a woven layer. The method comprises the following steps that wire splitting is completed to ensure that tension is stable; weaving is started after a strand of wire is marked, a weaving pitch h is measured after to-be-marked parts are all woven, and the number of grids N is calculated; a sample wire is fixed to a wire density sampling device after the weaving is completed, the sample wire is cut off after being straightened to obtain a 1m sample with the woven layer, and thewoven layer falls off and is weighed to obtain the weight G of the 1m sample with the woven layer; a parameter C can be calculated by substituting N and G into a formula; and a 1.5m sample wire withthe woven layer is taken at the outer end of the to-be-detected wire, the sample wire is straightened and cut off, the woven layer falls off and is weighed to obtain G', and a change ratio P of the number of grids is calculated. The effects of the method are that detection work can be quantified, operation is simplified, a process is standardized, human instable factors caused by different measuring personnel and measuring methods are eliminated, the weaving quality can be greatly improved, and invisible weaving irregularities caused by tension change and the like can be reduced.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a method for detecting the insulation braiding quality of superconducting wires. Background technique [0002] Low temperature superconducting wire is currently the most widely used superconductor material, among which NbTi and Nb 3 Sn is the representative. They are widely used in magnetic resonance imaging (MRI), nuclear magnetic resonance spectroscopy (NMR), large particle accelerators and superconducting energy storage systems (SMES), magnetic confinement nuclear fusion devices (Tokamak) and other magnet winding. In order to ensure the safety of the magnet operation, the outer surface of the low-temperature superconducting wire needs to be coated with insulating material. The insulating material of the superconducting wire in MRI is obtained by braiding. The commonly used braiding insulating materials are high-performance polyester filaments and gla...

AI Technical Summary

Problems solved by technology

[0003] In the process of braiding superconducting wires in the prior art, the tension of the strands of the braiding machine is usually out of control, and the speed of take-up and pay-off is unstable, which causes the phenomenon of dense or thinning of the insulating braiding layer. Interference, braiding will be regularly braided until the end, resulting in a technical problem of overall quality problems, the invention provides a method of using the weight of the braided layer to detect the braiding quality of superconducting wire insulation, which can be adapted to rectangular or circular sections , can adapt to superconducting wires of different materials - NbTi wires, inner tin method Nb 3 Sn wire and bronze method Nb 3 Insulation braiding quality inspection of Sn wire

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