Method for measuring length of superconductive braided flat wire by utilizing accumulation of turn number

Abstract

The invention provides a method for measuring a length of a superconductive braided flat wire by utilizing accumulation of a turn number. The method comprises the steps that: a cylinder diameter D isunified; a thread end of the superconductive flat wire is enabled to sequentially pass through each guide wheel, a laser meter counting system and a wire arrangement device and finally is taken up ona take-up wheel; a compound winding tension is set as 25N; close-packed compound winding of the wire is started, wherein a compound winding speed is 50m / min; four parameters, such as a layer turn number Ni, a first-layer single turn length x1, a tolerance delta x and a total turn number N after compound winding is ended, are obtained by a compound winding experiment, and a corresponding wire length L is calculated by a turn number meter counting formula; the wire length L is compared to a length displayed by a laser meter counting device to calculate turn number meter counting accuracy. According to the invention, after a plurality of pieces of data are simply measured, high-accuracy meter counting can be implemented by utilizing a counter; and accuracy can reach 0.3%.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a method for braiding the length of a superconducting flat wire. 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 flat wire used in MRI is obtained by braiding. The commonly used braiding insulating materials are high-performance polyester filaments and glass fil...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, when using a crawler-type meter meter to count the wire with a braided layer, the braided layer of the wire is easily damaged; if a dual-axis laser meter is used to count the meter, the cost is too high and it is not suitable for large-scale production To solve the technical problem, the present invention provides a method for measuring the length of superconducting braided flat wire by accumulating the number of turns. The superconducting braided flat wire itself has high precision, and the diameter of the wire wheel cylinder carrying the braided wire is highly uniform after being calibrated and selected. When the braided wires are densely arranged on the wire wheel, high-precision meter counting can be achieved only by simple counting of turns, and it has wide applicability in the field of superconducting wire insulation braiding

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