CN110608698A - Method for measuring length of superconducting braided flat wire by accumulated turns - Google Patents
Method for measuring length of superconducting braided flat wire by accumulated turns Download PDFInfo
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- CN110608698A CN110608698A CN201810618008.2A CN201810618008A CN110608698A CN 110608698 A CN110608698 A CN 110608698A CN 201810618008 A CN201810618008 A CN 201810618008A CN 110608698 A CN110608698 A CN 110608698A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/06—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness specially adapted for measuring length or width of objects while moving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F17/00—Methods or apparatus for determining the capacity of containers or cavities, or the volume of solid bodies
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- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
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 experimentiLength x of single turn of the first layer1Tolerance Δ x and total number of turns N after completion of rewindingGeneral assemblyAnd 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.
Description
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 rewindingi(required precision of 0.1 turns) and 50 turns of wire length LiAnd (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 LiX can be obtained by 50iExperimental value of (2), xiN linear fitting to obtain the length x of the single turn of the first layeriAnd 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 NGeneral 1Binding of fixed parameters (N)，xiAnd 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 xiRepresenting the length of the ith layer single turn.
Assuming that the total number of turns of the wire is NGeneral assemblyThe diameter of the wire wheel is D, the thickness of the wire is T, then N is knownGeneral assemblyOn the premise of obtaining N, the wire arrangement condition, N, N and M of the wire can be calculated through the formula (2).
NGeneral assemblyFormula (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.
xi＝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 obtainedGeneral assemblyThe 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 inventioni-n linear fit to the fitted graph;
FIG. 3 shows a smaller gauge wire x of the present inventioni-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.
The first embodiment is as follows: the invention discloses a method for measuring the length of a superconducting braided flat wire by accumulated turns
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 a paying-off machine of the densely-arranged rewinding equipment, sequentially passing a wire end through each guide wheel, a laser meter counting system and a wire arranging device, finally receiving the wire on a winding wheel, setting the rewinding tension to be 20N, starting the densely-arranged rewinding wire, and starting the functions of the laser meter counting device and a 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 rewindingi(required precision of 0.1 turns) and 50 turns of wire length LiAnd (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 LiX can be obtained by 50iExperimental value of (2), xiN linear fitting to obtain the length x of the single turn of the first layeriAnd 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 NGeneral 1Combining fixed parameters (N, x)iAnd Δ x) into equation (1), calculating the corresponding wire length L1。
Example two: the invention utilizes the accumulated number of turns to measure the precision of the method for measuring the length of the superconducting braided flat wire
Step 1: and 4 selected wire wheels are taken, the surfaces in contact with the wires are cleaned, and after the surfaces are cleaned by clean water, the surfaces are dehydrated by absolute ethyl alcohol and dried.
Step 2: the long-claw vernier caliper is adopted to measure the cylinder diameter of each wire wheel, so that the cylinder diameter is ensured to be DNominal nameWithin the range of +/-1 mm, the gear is named as a wire wheel 2, a wire wheel 3, a wire wheel 4 and a wire wheel 5 in sequence, and the reference is made to the attached figure 1 of the specification.
And step 3: 4 wires of nominal size the same as NbTi 1 were selected, named NbTi 2, NbTi 3, NbTi 4, NbTi 5, respectively.
And 4, step 4: and selecting corresponding wire wheels and wires (such as the wire wheels 2 and the NbTi 2) and performing rewinding preparation work, namely step three (step 1-step 4).
And 5: and adding a turn number counter on the rewinding device, referring to the figure 6 of the specification, and starting the rewinding device and the turn number counter to start rewinding. After the rewinding is finished, the number of turns counter displays the number part plus the number of turns of the starting winding to obtain the total number of turns of the wire, and the 4 groups of data are respectively NIn total, 2，NIn total, 3，NTotal, 4，NTotal, 5。
Step 6: laser meter counter for recording after rewindingL 'respectively represents a value'2，L′3，L′4，L′5。
And 7: respectively change the total number of turns NGeneral assemblyCombining fixed parameters (N, x)1And Δ x) into equation (1), calculating the corresponding wire length L2，L3，L4，L5。
And 8: and calculating the precision of 5 groups of data, and taking the maximum value as the precision of the turn meter.
Example three: the invention relates to a volume measuring device
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 1, a detection liquid tank 2 and a pipeline 4, the bottoms of the detection tank 1 and the detection liquid tank 2 are communicated through the pipeline 4, a telescopic rod 3 is arranged below the middle part of the pipeline 4, a valve 5 is arranged on the pipeline 4, an opening is formed in one side of the detection tank 1, a sealing plate 7 is arranged at the opening, the sealing plate 7 extends out through the bottom of the detection tank 1, a measuring pipe 6 is arranged on one side, opposite to the opening, of the detection tank 1, the measuring pipe 6 is communicated with the detection.
In the invention, a pressure plate 10 is arranged in the detection liquid tank 2, and a handle 11 is arranged on the pressure plate 10.
In the invention, the pipeline 4 at the fixed position of the telescopic rod 3 is provided with an opening 9.
In the invention, the side wall of the bottom of the measuring pipe 6 is provided with a sealing plug 1.
In the invention, the measuring tube 6 is an acid burette, and the upper part of the acid burette is communicated with the detection tank 1 through a rubber tube.
In the invention, the top of the telescopic rod 3 is level with the lower edge of the connecting port of the measuring tube 6 and the detection tank 1.
During measuring will detect the measuring liquid in the liquid jar through the clamp plate and impress and detect jar 1, to measure and stop when measuring the intraductal outflow liquid of pipe 6, close valve 5, will survey buret rotatory upwards, adjust suitable height with closing plate 7, will await measuring the sample and put into and detect jar 1, rock gently for during the sample sinks to detect the liquid, put down survey buret 6 and let the measuring liquid that exceeds survey buret 6 flow into survey buret 6 and read and obtain the volume.
Example four: the invention discloses a method for measuring the length of a superconducting braided flat wire by accumulated turns
The invention utilizes the accumulated number of turns to measure the length of a large-specification flat wire, and comprises the following steps:
(1) taking 5 wire wheels, selecting a cylinder with a nominal diameter value of 400mm by using a volume measuring device to ensure that the diameter is within the range of 400mm +/-1 mm, cleaning the surface in contact with the wire, wiping the surface with clean water, dehydrating with absolute ethyl alcohol, and drying. The diameters of the cylinders at 5 different positions of one reel are measured by a long claw vernier caliper to be 399.78mm, 399.58mm, 399.76mm, 400.06mm, 399.82mm and D is 399.80mm respectively, and the diameters of the cylinders at 5 different positions of the other reel are measured by the long claw vernier caliper to be 399.78mm, 399.92mm, 399.96mm and 399.96mm within a required range, which indicates that the method is feasible.
(2) Cleaning the close-packed rewinding equipment, and loading the wire wheels into a wire rewinding machine of the close-packed rewinding equipment.
(3) Taking a rectangular (width and height) knitted insulated NbTi wire rod with the nominal size of 2.553mm 1.765mm, cleaning the closely-spaced rewinding equipment, cleaning the wire rod by using clean water, dehydrating the wire rod by using absolute ethyl alcohol, drying the wire rod by blowing, fixing the experimental wire to a paying-off machine of the closely-spaced rewinding equipment, sequentially passing the wire end through each guide wheel, the laser meter counting system and the wire arranging device, and finally receiving the wire end on a take-up wheel.
(4) And setting the rewinding tension to be 25N, starting to densely arrange the rewinding wires, enabling the rewinding speed to be less than 30m/min, and simultaneously starting the functions of the laser meter counter and the turn number counter.
(5) And starting winding for 2-3 circles, and artificially applying certain pressure to the wires to ensure that the wires are compact. After the wire is stabilized, a certain lateral pressure is applied by using a polytetrafluoroethylene rod, so that the uniform gap of the wire is ensured.
(6) After the rewinding is completed, the number of layer turns recorded NiAnd 50 turns of wire length liSee table 1.
(7) The full layer number is 31 layers, and the outermost layer number of turns is 1.3 turns.
(8) Will NiThe average value is obtained, the number of single-layer turns N is 111.15 turns, and the total number of turns NGeneral 13446.8 turns.
(9) By calculating li50 obtaining xiExperimental value of (1), xiThe fitting result of-n is shown in the attached figure 2 of the specification, wherein y is 0.01113x +1.24564, and R is2.000000.99996, the first layer has a single turn length xi1.25677mm, and a tolerance Δ x of 0.01113 mm.
(10) Display value L 'of laser meter after the rewinding is finished'14911.3 m.
(11) Total number of turns NGeneral assembly3446.8 turns combined with fixed parameters (N111.15 turns, x)11.25677mm, Δ x 0.01113mm), the wire length L is calculated1＝4907.5m。
(12) 4 wires with the same nominal size as the experimental wire are selected and are rewound on equipment provided with a turn number counter, the total turns obtained after the rewinding are 3441, 3433,1434 and 1083 respectively, and the display values of the laser meter counter are 4905.7m, 4892.9m, 1902.5m and 1417.0m respectively.
(13) The total number of turns is combined with a fixed parameter (N111.15 turns, x) respectively11.25677mm, Δ x 0.01113mm), calculated to correspond to wire lengths of 4898.2m, 4885.5m, 1897.2m, 1413.9m in that order.
(14) The calculated precision of 5 groups of data is 0.08%, 0.15%, 0.15%, 0.27% and 0.22% in sequence, and the meter precision of turns is 0.3%.
Example five: the invention discloses a method for measuring the length of a superconducting braided flat wire by accumulated turns
The invention utilizes the accumulated number of turns to measure the length of the flat wire with smaller specification, and comprises the following steps:
(1) taking 5 wire wheels, selecting a cylinder with a nominal diameter value of 400mm by using a volume measuring device to ensure that the diameter is within the range of 400mm +/-1 mm, cleaning the surface in contact with the wire, wiping the surface with clean water, dehydrating with absolute ethyl alcohol, and drying. The diameters of 5 different positions of the cylinder of one reel are measured by a long claw vernier caliper and are 399.98mm, 400.02mm, 400.02mm, 400.10mm, 399.88mm and D is 400.00mm respectively, and the diameters of the 5 different positions of the cylinder of the other reel are measured by the long claw vernier caliper and are 400.22mm, 399.96mm, 400.34mm and 399.88mm respectively in a required range, so that the method is feasible.
(2) Cleaning the close-packed rewinding equipment, and loading the wire wheels into a wire rewinding machine of the close-packed rewinding equipment.
(3) A rectangular (width by height) braided insulated NbTi wire of nominal size 2.24mm by 1.425mm was taken. Cleaning the close-packed rewinding equipment, cleaning the close-packed rewinding equipment by using clear water, dehydrating by using absolute ethyl alcohol, drying by blowing, fixing the experimental wire to a paying-off machine of the close-packed rewinding equipment, sequentially passing a wire end through each guide wheel, the laser meter counting system and the wire arranging device, and finally receiving the wire end on a take-up pulley.
(4) And setting the rewinding tension to be 40N, starting to densely arrange the rewinding wire rods, enabling the rewinding speed to be less than 30m/min, and simultaneously starting the functions of a laser meter counter and a turn number counter.
(5) And starting winding for 2-3 circles, and artificially applying certain pressure to the wires to ensure that the wires are compact. After the wire is stabilized, a certain lateral pressure is applied by using a polytetrafluoroethylene rod, so that the uniform gap of the wire is ensured.
(6) After the rewinding is completed, the number of layer turns recorded NiAnd 50 turns of wire length liSee table 1.
(7) The full layer number is 30 layers, and the outermost layer number of turns is 101.2 turns.
(8) Will NiThe average value is obtained to obtain 149.20 turns of single-layer turn number N and total turn number NGeneral 14577.2 turns.
(9) By calculating li50 obtaining xiExperimental value of (1), xiThe fitting result of-n is shown in the attached figure 3 of the specification, wherein y is 0.00892x +1.24808, R2.000000.99994, the first layer has a single turn length xi1.25700mm, and a tolerance Δ x of 0.00892 mm.
(10) Display value L 'of laser meter after the rewinding is finished'16369.0 m.
(11) Total number of turns NGeneral assembly4577.2 combined with fixed parameters (N149.20 turns, x)11.25700mm, Δ x 0.00892mm), the wire length L is calculated1＝6359.5m。
(12) 4 wires with the same nominal size as the experimental wire are selected and are rewound on equipment provided with a turn number counter, the total turns obtained after the rewinding are 2942, 2155,1825 and 2458 in sequence, and the display values of the laser meter counter are 3953.0m, 2841.5m, 2390.1m and 3265.7m in sequence.
(13) The total number of turns is combined with a fixed parameter (N-149.20 turns, x) respectively11.25700mm, Δ x 0.00892mm), calculated to correspond to wire lengths of 3943.8m, 2838.2m, 2385.6m, 3259.5m in that order.
(14) The calculated precision of 5 groups of data is 0.15%, 0.23%, 0.12%, 0.19% and 0.19% in sequence, and the meter-counting precision of turns is 0.3%.
TABLE 1 close-packed rewinding experimental parameters for two specifications of wire
Example six: the method for measuring the length of the superconducting braided flat wire by accumulated turns has validity verification
In order to prove the reliability and stability of the method, the same experimental wire is wound to test the length of the wire, the same batch of wire wheels are adopted, different operators strictly operate according to the steps, and the number of turns N of the layer is measurediThe full number of layers n, the number of turns M of the outermost layer and the length l of 50 turns of wire material of each layeriCalculating the fixed parameters N, x1Δ x and NGeneral assemblyThe final calculated wire length is shown in the following table:
| number of reel | Operator numbering | Length of wire/m |
| Reel 1 | A | 5496.0 |
| Reel 2 | B | 5493.4 |
| Reel 3 | C | 5495.4 |
| Reel 4 | D | 5494.8 |
The coefficient of variation COV (standard deviation divided by the mean of the measurements) of the wire length test results was calculated to be 0.02%.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope determined by the present invention.
Claims (10)
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 DNominal nameIn 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 layeriAnd 50 turns of wire length LiAfter 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 NGeneral assemblyN can be calculated by n.n + MGeneral 1；
(6) In addition, by calculating LiX can be obtained by 50iExperimental value of (2), xiN linear fitting to obtain the length x of the single turn of the first layeriAnd 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 NGeneral 1Combined with fixed parameters N, xiAnd 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 recordediThe 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.
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| CN201810618008.2A CN110608698A (en) | 2018-06-15 | 2018-06-15 | Method for measuring length of superconducting braided flat wire by accumulated turns |
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| CN113932875A (en) * | 2021-09-15 | 2022-01-14 | 中联重科股份有限公司 | Method for determining the scale volume of a mixing station, processor and mixing station |
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