A device for measuring the torque of low-temperature superconducting wires

A low-temperature superconducting and wire technology, which is applied in the direction of measuring devices, power measurement, and analysis materials, can solve the problems of complex shooting section methods, high equipment requirements, and long measurement cycles, and solve the difficult and repeatable torque detection. Good, the effect of shortening the measurement cycle

Active Publication Date: 2014-10-08
西部超导材料科技股份有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a method and device for measuring the torque of a low-temperature superconducting wire, which solves the complexities of the current scanning electron microscope photographing section method, high equipment requirements, difficult mastery, and long measurement cycle. long wait question

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  • A device for measuring the torque of low-temperature superconducting wires
  • A device for measuring the torque of low-temperature superconducting wires
  • A device for measuring the torque of low-temperature superconducting wires

Examples

Experimental program
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Effect test

example 1

[0057] Example 1: Torque measurement of NbTi / Cu superconducting composite wire for ITER

[0058] See Parts 2 and 3.

example 2

[0059] Example 2: ITER uses inner tin method Nb 3 Sn wire torque measurement

[0060] Inner tin method Nb for ITER 3 Sn wire, wire diameter 0.821mm, core wire diameter about 6μm, 3000 cores, design torque between 16.1mm~16.5mm.

[0061] Compared with NbTi / Cu composite wire, inner tin method Nb 3 Sn wire has a layer of Nb barrier layer on the outside of the core wire. After the outer copper stabilization layer is corroded, this layer of barrier layer prevents nitric acid from continuing to corrode the inner copper. Therefore, the measurement of inner tin method Nb 3 The steps of Sn wire torque will be slightly different, as follows:

[0062] Step 1: Preparation before measurement

[0063] Corrosion of the outer copper layer of the sample: Take a section of the sample and put it into 60% nitric acid solution for corrosion. After 15 minutes, the copper layer on the surface is completely dissolved ( Figure 5 a). The samples were taken out and rinsed with running water, deh...

example 3

[0073] Example 3: Measurement of flat belt torque for MRI

[0074] Flat tape for MRI is a kind of NbTi / Cu superconducting composite wire. Its operation steps are the same as the NbTi / Cu superconducting composite wire used for ITER. The measured sample size is: 1.20mm×0.75mm, the design torque is 45mm, the core wire diameter is 25μm, and 630 cores.

[0075] The measured data are as follows

[0076] l=158.4mm, rotated 3 times, the dial reading is 182°, the total degree is 1262°, the calculated torque L p = 45.2 mm.

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Abstract

The invention relates to a method for measuring torque of a low temperature superconductive wire, and an apparatus thereof. The apparatus is characterized in that a supporting rod is a circular pipe with notches; a sliding block is embedded in the circular pipe and is slidingly connected with the supporting rod; one end of the supporting rod is provided with an angle indicating dial and a rotating knob; a through hole is arranged at the centers of the sliding block and the rotating knob; a screw for fixing to-be-measured wire are disposed at the edge of the through hole; and the size of each notch of the supporting rod is smaller than the diameter of the supporting rod. The method is simple, shortens a measuring period (about 0.5 h to 1 h for measuring one sample), and has good repeatability. By using the method for measuring the torque, efficiency of product performance detection is increased, because the method has strong operability and can be mastered by general workers through simple training; and the problem of difficult detection of the torque for low temperature superconductive wire is solved.

Description

technical field [0001] The invention belongs to the technical field of performance measurement of superconducting materials, and relates to a method and a device for measuring the torque of a low-temperature superconducting wire. Background technique [0002] With NbTi and Nb 3 Sn is the representative low-temperature superconducting wire, which is the most widely used superconductor at present. It has a wide range of applications in nuclear 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 many other fields. The design of practical superconducting wires generally adopts the method of thinning superconducting materials and embedding them in good conductor materials of electricity and heat (such as copper, aluminum, etc.), and twisting the wires before final molding. The untwisted wire is very unstable. After...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/26G01L3/00
Inventor 高慧贤
Owner 西部超导材料科技股份有限公司
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