阅读说明：本技术 一种利用匝数累计测量超导编织扁线长度的方法 (Method for measuring length of superconducting braided flat wire by accumulated turns ) 是由 柳祥 郭强 闫凯鹃 杨创利 朱燕敏 秦星 刘建伟 李建峰 刘向宏 冯勇 于 2018-06-15 设计创作，主要内容包括：本发明提供了一种利用匝数累计测量超导编织扁线长度的方法,包括圆筒直径D统一,将超导扁线线头依次穿过各导轮、激光计米系统及排线器,最终收到收线轮上,将复绕张力设置为25N,开始密排复绕线材,复绕速度小于50m/min,通过复绕实验获得层匝数N<Sub>i</Sub>,第一层单匝长度x<Sub>1</Sub>,公差Δx及复绕结束后的总匝数N<Sub>总</Sub>等4个参数,并通过匝数计米公式计算出对应的线材长度L,对比激光机密器显示长度计算匝数计米精度。本发明在简单测量几个数据后就能利用计数器实现高精度计米,精度可高达0.3％。(The invention provides a method for measuring the length of a superconducting braided flat wire by accumulated turns, which comprises the steps of unifying the diameter D of a cylinder, sequentially passing the wire head of the superconducting flat wire through each guide wheel, a laser meter counting system and a wire arranging device, finally receiving the wire head on a take-up pulley, setting the rewinding tension to be 25N, starting to densely arrange the rewinding wire rods, setting the rewinding speed to be less than 50m/min, and obtaining the number of turns N of a layer by a rewinding experiment i Length x of single turn of the first layer 1 Tolerance Δ x and total number of turns N after completion of rewinding General assembly And waiting for 4 parameters, calculating the length L of the corresponding wire according to a turn number meter formula, and comparing the length displayed by a laser encryptor to calculate the turn number meter precision. The invention can realize high-precision meter counting by using the counter after simply measuring a plurality of data, and the precision can reach 0.3 percent.)

1. A method for measuring the length of a superconducting braided flat wire by using accumulated turns is characterized by comprising the following steps:

(1) measuring the diameter D of the cylinder of the braided wire take-up pulley to ensure that the diameter of the cylinder is D_{Nominal name}In the range of +/-1 mm;

(2) cleaning the densely-arranged rewinding equipment, loading the wire wheel 1 into a take-up machine of the densely-arranged rewinding equipment, preparing 1 superconducting flat wire with a woven layer, fixing the superconducting flat wire to a pay-off machine of the densely-arranged rewinding equipment, sequentially passing a wire end through each guide wheel, a laser meter system and a wire arranging device, finally receiving the wire on a take-up wheel, starting densely-arranged rewinding wires, and starting functions of a laser meter and a turn number counter;

(3) in the process of rewinding, each layer of wire rod records the number of turns N of each layer_iAnd 50 turns of wire length L_iAfter the recording is finished, resetting, and continuing to record the data of the next layer of wire;

(4) after the wire is densely arranged and rewound, recording the number n of full layers and the number M of turns of the outermost layer, and calculating the number of the full layers according to a formulaCalculating the number N of single-layer turns;

(5) then through N_{General assembly}N can be calculated by n.n + M_{General 1}；

(6) In addition, by calculating L_iX can be obtained by 50_iExperimental value of (2), x_iN linear fitting to obtain the length x of the single turn of the first layer_iAnd a tolerance Δ x;

(7) recording the display value of the laser length counter after the rewinding is finished, i.e. the total length L of the wire₁；

(8) Total number of turns N_{General 1}Combined with fixed parameters N, x_iAnd Δ x intoCalculate the corresponding length L of the wire₁。

2. The method of claim 1, wherein the number of turns N of the recording layer is recorded_iThe required accuracy is 0.1 turns.

3. The method of claim 1, wherein the method comprises setting a rewinding tension of 20N to 40N and starting to close-packed rewinding the wires after the wires are finally received on a take-up reel, wherein the rewinding speed is less than 50 m/min.

4. The method for measuring the length of a superconducting braided flat wire by using the cumulative number of turns as claimed in claim 1, wherein in the step (3), winding is started for 2-3 turns, the wire is pressed to ensure the tightness of the wires, and after the wire is stabilized, a certain lateral pressure is applied by using a polytetrafluoroethylene rod to ensure the uniform gap of the wires.

5. The method according to claim 1, wherein the volume of the braided wire take-up wheel is measured by a volume measuring device, the braided wire take-up wheel is classified according to different specifications by the volume of the detection liquid discharged after the braided wire take-up wheel is placed in the volume measuring device, the volume measuring device comprises a detection tank, a detection liquid tank and a pipeline, the bottom of the detection tank is communicated with the bottom of the detection liquid tank through the pipeline, a telescopic rod is arranged below the middle part of the pipeline, a valve is arranged on the pipeline, a notch is arranged on one side of the detection tank, a sealing plate is arranged at the notch and extends out of the bottom of the detection tank, a measuring pipe is arranged on the detection tank opposite to the notch, the measuring pipe is communicated with the detection tank through a hose, and the telescopic rod and the measuring pipe are provided.

6. The method according to claim 5, wherein a pressing plate is provided inside the detection tank, and a handle is provided on the pressing plate.

7. The method of claim 5, wherein the tube at the location where the telescoping rod is fixed is provided with an opening.

8. The method for measuring the length of a superconducting braided flat wire by accumulating the number of turns as claimed in claim 5, wherein the measuring tube is provided with a sealing plug at the bottom side wall.

9. The method for measuring the length of a superconducting braided flat wire using cumulative number of turns as claimed in claim 5, wherein said measuring tube is an acid type burette, and the upper portion of the acid type burette is communicated with the measuring tank through a rubber tube.

10. The method of claim 5, wherein the top of the telescoping rod is flush with the lower edge of the connection port between the measuring tube and the testing tank.

Technical Field

The invention belongs to the technical field of superconducting material processing, and relates to a method for the length of a superconducting braided flat wire.

Background

Low-temperature superconducting wire is the most widely used superconductor material at present, and NbTi and Nb are used₃Sn is representative. They are widely used in magnet winding for nuclear Magnetic Resonance Imagers (MRI), nuclear magnetic resonance spectrometers (NMR), large particle accelerators and superconducting energy storage systems (SMES), magnetic confinement nuclear fusion devices (Tokamak), etc. In order to ensure the safety of the operation of the magnet, the outer surface of the low-temperature superconducting wire needs to be coated with an insulating material, and the insulating material of the superconducting flat wire for MRI is obtained by weaving, wherein the commonly used weaving insulating materials are high-performance polyester yarns and glass yarns. If the crawler-type meter counter is adopted to meter the wires with the woven layer, the woven layer of the wires is easy to damage; if a double-optical-axis laser meter counter is adopted for metering, the cost is too high, and the method is not suitable for large-scale production. Therefore, it is important to obtain a high precision metric method for knitting flat wires.

Disclosure of Invention

Aiming at the problem that when a crawler-type meter counter is adopted to meter the wire with a braided layer in the prior art, the braided layer of the wire is easy to damage; the invention provides a method for measuring the length of a superconducting flat knitting wire by using accumulated turns, which utilizes the characteristics of high precision of the superconducting flat knitting wire and strong uniformity of the diameter of a drum of a wire wheel bearing the knitting wire after calibration and selection, can realize high-precision meter counting only by simple turns when the knitting wire is densely arranged on the wire wheel, and has wide applicability in the field of superconducting wire insulation knitting.

The invention provides a method for measuring the length of a superconducting braided flat wire by accumulated turns, which comprises the following steps:

(1) and measuring the cylinder diameter D of the braided wire take-up pulley.

(2) Cleaning the densely-arranged rewinding equipment, loading the wire wheel 1 into a winding machine of the densely-arranged rewinding equipment, preparing 1 superconducting flat wire with a braided layer, fixing the superconducting flat wire to the paying-off machine of the densely-arranged rewinding equipment, sequentially passing a wire end through each guide wheel, the laser meter counting system and the wire arranging device, finally receiving the wire on a winding wheel, setting the rewinding tension to be 20N-40N, starting the densely-arranged rewinding wire, and starting the functions of the laser meter counter and the turn number counter at the rewinding speed of less than 50 m/min.

(3) And starting winding for 2-3 circles, and applying pressure to the wires to ensure that the wires are compact. After stabilization, polytetrafluoroethylene rods are adopted to apply certain lateral pressure, the uniform gap of the wires is ensured, and the number of turns N of each layer of wires is recorded in the process of rewinding_i(required precision of 0.1 turns) and 50 turns of wire length L_iAnd (i is 1, 2, 3 … n), clearing after recording is finished, and continuing to record data of the next layer of wire rod.

(4) And after the wire is densely wound, recording the number N of full layers and the number M of turns of the outermost layer, and calculating the number N of turns of the single layer according to a formula (4).

(5) Then, N can be calculated by the formula (2)_{General 1}。

(6) In addition, by calculating L_iX can be obtained by 50_iExperimental value of (2), x_iN linear fitting to obtain the length x of the single turn of the first layer_iAnd a tolerance ax.

(7) Recording the display value of the laser length counter after the rewinding is finished, i.e. the total length L of the wire₁。

(8) Total number of turns N_{General 1}Binding of fixed parameters (N)，x_iAnd Δ x) into equation (1), calculating the corresponding wire length L₁。

According to the invention, a volume measuring device is placed in a braided wire take-up wheel to measure the volume, the braided wire take-up wheel is classified according to different specifications through the volume of detection liquid discharged after the braided wire take-up wheel is placed, the volume measuring device comprises a detection tank, a detection liquid tank and a pipeline, the detection tank is communicated with the bottom of the detection liquid tank through the pipeline, a telescopic rod is arranged below the middle part of the pipeline, a valve is arranged on the pipeline, an opening is formed in one side of the detection tank, a sealing plate is arranged at the opening, the sealing plate extends out of the bottom of the detection tank, a measuring pipe is arranged on one side of the detection tank opposite to the opening, the measuring pipe is communicated with the.

In the invention, a pressure plate is arranged in the detection liquid tank, and a handle is arranged on the pressure plate.

In the invention, the pipeline at the fixing position of the telescopic rod is provided with an opening.

In the invention, the side wall of the bottom of the measuring tube is provided with a sealing plug.

In the invention, the measuring tube is an acid burette, and the upper part of the acid burette is communicated with the detection tank through a rubber tube.

In the invention, the top of the telescopic rod is level with the lower edges of the connecting ports of the measuring tube and the detection tank.

Principle for detecting weaving quality of superconducting wire through weight of weaving layer

In the process of weaving the superconducting wire, the phenomenon of dense weaving or sparse weaving of the insulating braided layer is caused by equipment reasons such as loss of control of strand tension of a weaving machine, unstable take-up and pay-off speeds and the like, if the problems occur, weaving can be regularly carried out until the end, and then the weaving rule of the whole wire can be represented by taking the braided layer of 1m of the wire.

If one superconducting flat wire is densely wound on the wire wheel, the total length of the wire can be calculated by the formula (1).

Wherein L represents the total length of the wire, N represents the number of full layers of the wire, N represents the number of turns of each layer of the wire, M represents the number of turns of the outermost layer of the wire, and x_iRepresenting the length of the ith layer single turn.

Assuming that the total number of turns of the wire is N_{General assembly}The diameter of the wire wheel is D, the thickness of the wire is T, then N is known_{General assembly}On the premise of obtaining N, the wire arrangement condition, N, N and M of the wire can be calculated through the formula (2).

N_{General assembly}Formula (2) n.n + M

In addition, x is known from the formula (3)_iFor an arithmetic progression, the length x of the single turn of the first layer is obtained through experimental measurement and data fitting₁And a tolerance ax.

x_i＝3.14[D+(2i+1)T]Formula (3)

Therefore, N, x when the wires with the same size are wound on the wire wheels with the same specification₁And Δ x is a fixed parameter (to be measured), only N needs to be obtained_{General assembly}The total length L of the wire rod can be calculated through the formula (1).

The invention has the beneficial effects that:

the method for measuring the length of the flat superconducting braided wire by using the accumulated turns utilizes the characteristics that the diameter D of a cylinder is stable, the thickness T of a wire rod is stable and the number N of turns of each layer of the wire rod is stable when the flat superconducting wire is braided, combines the calculation formula of the invention, can realize high-precision metering by using a counter after simply measuring a plurality of data, and has the precision as high as 0.3 percent, so that the detection work number is quantized, the operation is simplified, the flow is standardized, the artificial instability factors caused by different measuring personnel and measuring methods are solved, the braiding quality can be greatly improved, the problem of large length measurement deviation caused by tension change and the like is reduced, and the applicability is wide in the field of superconducting wire braiding.

Drawings

FIG. 1 is a diagram of a wire close-packed rewinding process according to the present invention;

FIG. 2 shows a larger gauge wire x of the present invention_i-n linear fit to the fitted graph;

FIG. 3 shows a smaller gauge wire x of the present invention_i-n is linearFitting the fitting graph;

FIG. 4 is a first schematic structural diagram of a volume measuring device according to the present invention;

FIG. 5 is a schematic structural diagram of a volume measuring device according to the present invention;

fig. 6 is a diagram of a turn counter according to the present invention.

In the figure 4-5, 1-detection tank, 2-detection tank, 3-telescopic rod, 4-pipeline, 5-valve, 6-measuring tube, 7-sealing plate, 8-scale, 9-hole, 10-pressing plate, 11-handle.

Detailed Description

The following description of the embodiments of the present invention will be made in further detail with reference to the accompanying fig. 1 to 6 and examples, but the method of the present invention is not limited to the following examples.