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Method for measuring size of MRI superconducting wire rod woven insulated wire rod by way of wire reel rewinding
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A technology of superconducting wire rod and wire rod, applied in the direction of measuring device, mechanical measuring device, using mechanical device, etc., can solve the problem that the size cannot be truly reflected
Inactive Publication Date: 2018-05-11
西部超导材料科技股份有限公司
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The braided material has a certain degree of ductility. When measuring the size of a single braided insulation wire, the braided material will undergo a certain elastic extension, so that the braided insulation size of a single wire cannot truly reflect the size of the wire when it is wound into a magnet.
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[0033] Step 1: Take 1000m of braided insulated NbTi wire with a nominal diameter of 0.82mm. Clean the wire wheel and rewinder with clean water, dehydrate with absolute ethanol, and blow dry;
[0034] Step 2: Fix the reel of the wire to be tested on the winding spool, and clamp the positioning reel in the corresponding positioning hole of the reel so that the winding tension can be loaded normally.
[0035] Step 3: Put one end of the wire to be tested into the rewinding equipment, ensure that the wire is in the corresponding guide groove, receive it on the measuring wire wheel, and simply bend and fix it;
[0036] Step 4: Set the rewinding tension to 30N, start densely packed rewinding wires, and the rewinding speed is 50m / min;
[0037] Step 5: Start winding 2 to 3 times, artificially apply pressure to the wires to ensure the tightness between the wires, and apply lateral pressure with a PTFE rod after st...
[0043] Step 1: Take a 500m braided insulated NbTi wire with a rectangular (width*height) nominal size of 2.25mm*1.45mm. Clean the wire wheel and rewinder with clean water, dehydrate with absolute ethanol, and blow dry;
[0044] Step 2: Fix the reel of the wire to be tested on the winding spool, and clamp the positioning reel in the corresponding positioning hole of the reel so that the winding tension can be loaded normally.
[0045] Step 3: Put one end of the wire to be tested into the rewinding equipment, ensure that the wire is in the corresponding guide groove, receive it on the measuring wire wheel, and simply bend and fix it;
[0046] Step 4: Set the rewinding tension to 25N, start densely packed rewinding wires, and the rewinding speed is 20m / min;
[0047] Step 5: Start winding 2 to 3 times, artificially apply pressure to the wires to ensure the tightness between the wires, and apply lateral pressure wi...
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Abstract
Disclosed is a method for measuring the size of an MRI superconducting wire rod woven insulated wire rod by way of wire reel rewinding. A wire reel and a rewinding machine are cleaned with clean water, dehydrated with anhydrousethanol, and dried; a wire reel of a wire rod to be measured is fixed on a bobbin, and a positioning tray is clamped into a corresponding wire reel positioning hole; one end of the wire rod to be measured is sent into the rewinding device, and the rewinding tension is set as 20 to 40N to start close arranging and rewind the wire rod to ensure that the wire rod gaps areuniform; after 55 turns of winding, the winding is stopped; 50 turns of the wire rod are counted and the wire rod is marked at the 50 turns; the widths W1, W2, W3, W4 and W5 of the wire rod with 50 turns at five positions in a tight state are measured with a vernier caliper, and the size of the wire rod is equal to (W1+W2+W3+W4+W5) / (5*50). The method for simulating a wound magnet according to invention has the function of simplifying the measurement operation and standardizing the flow. The artificial instability factors caused by different measurement personnel and measurement methods are eliminated.
Description
technical field [0001] The invention relates to a size test of a superconducting material, in particular to a method for measuring the size of an MRI superconducting wire braided insulated wire by rewinding a wire wheel. 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 resonancespectroscopy (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 covered with insulating materials. The insulating material of the superconducting wire in MRI is obtained by weaving or painting, and the commonly used braiding insulating materials are high-perfo...
Claims
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