CN102841023B - Method for measuring torque of low temperature superconductive wire, and apparatus thereof - Google Patents
Method for measuring torque of low temperature superconductive wire, and apparatus thereof Download PDFInfo
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- CN102841023B CN102841023B CN201210278929.1A CN201210278929A CN102841023B CN 102841023 B CN102841023 B CN 102841023B CN 201210278929 A CN201210278929 A CN 201210278929A CN 102841023 B CN102841023 B CN 102841023B
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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
The invention belongs to superconductor performance measurement technical field, relate to a kind of method and device thereof of measuring low-temperature superconducting wire torque.
Background technology
With NbTi and Nb
3sn is for representing that low-temperature superconducting wire is current most widely used superconductor.At NMR imaging instrument (MRI), nuclear magnetic resonance spectrometer (NMR), large-scale particle accelerator and superconductive energy storage system (SMES), there is application extremely widely in multiple fields such as magnetic confinement nuclear fusion device (Tokamak).Practical superconducting wire design generally adopts superconductor filamentization and embeds in electric and hot good conductor material (as copper, aluminium etc.) and the method for before final molding, wire rod being reversed.Very unstable without the wire rod reversing, to flow through after specific length at electric current, its inner all core silk can be coupled together completely, and a similar very thick core silk is in effect.Twisting technique has been broken this coupling, can greatly reduce coupling effect, reduces flux jumping, reduces the wastage thereby reach, and increases the object of the stability of wire rod.
Now, along with the expansion of domestic low-temperature superconducting wire large-scale production, wire rod kind increase, towards customers also day by day increase.Very most client requires the lay length of twist (being called for short afterwards torque) to final finished wire rod to propose clear and definite requirement.And development in early days, the nominal torque providing while conventionally only having parameter while setting strander while reversing wire rod.Wire rod again after final molding the measurement of actual torque become difficult point.Existing generally employing in the world inlayed sample and at least one pitch range, taken continuously multiple scanning electron microscope pictures, after printing in proportion, carefully splicing, measure integral multiple torque length the method divided by enlargement factor, its shortcoming is that operational sequence is complicated, and very high to measuring equipment requirement, measuring period is long, generally need even within several days, just can complete for one day, general workman cannot grasp through short-term cultivation.
Summary of the invention
The technical matters solving
The problems such as for fear of the deficiencies in the prior art part, the present invention proposes a kind of method and device thereof of measuring low-temperature superconducting wire torque, has solved the scanning electron microscope adopting now and has taken the numerous and diverse of Cross Section Method, and equipment requirement is high, is difficult for grasping, and measuring period is long.
Technical scheme
Measure a method for low-temperature superconducting wire torque, it is characterized in that step is as follows:
Step 1: get one section of tested wire rod sample, by tested wire rod sample tension;
Step 2: tested wire rod sample middle part is carried out corroding in the bending rear salpeter solution that immerses volume ratio 40% ~ 60%, until inner core silk disperses;
Step 3: the tested wire rod sample corroding is taken out, repeatedly rinse with circulating water, then to leave standstill natural air drying after dehydration of alcohol, or dry up by hot blast gentleness;
Step 4: tested wire rod sample is strained again, measured the partial-length l that is corroded;
Step 5: the one end that rotates tested wire rod sample is untied the twisting of wire core silk, and all core silks are parallel shape; The angle θ of record rotation, calculates torque
wherein:
Realize a device for the method for described measurement low-temperature superconducting wire torque, it is characterized in that comprising slide block 1, support bar 2, angle display disc 3 and turning knob 4; Support bar 2 is the pipe with notch, and slide block 1 embeds in pipe, is to be slidably connected with support bar 2; One end of support bar 2 is provided with angle display disc 3 and turning knob 4; The center of described slide block 1 and turning knob 4 is provided with through hole, and through hole edge is provided with the screw of fixing tested wire rod; The notch size of described support bar 2 is less than the diameter of support bar 2.
Beneficial effect
A kind of method and device thereof of measuring low-temperature superconducting wire torque that the present invention proposes, is applicable to diameter at 0.2mm ~ 2mm(or cross section is equal to it square-section wire rod) between, core filament diameter is at NbTi and the Nb of 3 μ m ~ 50 μ m
3sn multi-core composite superconducting wire torque measurement.The inventive method is easy and shortened measuring period (measure a sample about half an hour to one hour), favorable repeatability.Adopt the inventive method to carry out torque measurement, workable, general workman just can grasp through simple training, has improved the efficiency that properties of product detect.Solve domestic low-temperature superconducting wire torque and detected difficult problem.
Brief description of the drawings
Fig. 1: principle schematic;
Fig. 2: servicing unit design diagram;
Fig. 3: servicing unit pictorial diagram: measure wire diameter 0.2mm ~ 2mm, torque <50mm;
Fig. 4: torque measurement process: a) b) c) d) e) rotary sample one end of corrosion region linear measure longimetry of corrosion of bending preparation of samples corrosion of dress sample;
Fig. 5: Nb
3before Sn sample torque measurement set-up procedure a) sample b) corrode outer copper c) corrode after sample d) barrier layer polish.
Embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
Part I: the inventive method principle and complete step are described
One, measuring principle
Multi-core low-temp superconducting wire is to embed copper matrix by tens even thousands of superconducting core silks to be composited.Superconducting wire is through after twisting, and the core silk of its inside also can reverse according to specific torque Development pattern.The present invention utilizes this feature of low-temperature superconducting wire, contrived experiment: first sample two ends are fixed to (Fig. 1 a), erodes copper matrix sample center section with nitric acid, leaves that core silk is clear one by one divides, and measures corrosion partial-length l(Fig. 1 b) 1.; Secondly rotary sample one end (Fig. 1 c), until the core silk reversing parallel (Fig. 1 d), records windup-degree θ, and calculates the torsion number of turns:
3. calculate torque
Two, servicing unit design and fabrication
In order to implement above-mentioned measurement scheme, inventor has designed a servicing unit, sees Fig. 2, acts on as follows: 1. stretching and fixed sample, make sample can be in whole operating process autorotation.On assembly A and assembly B, be designed with the screw of fixing wire rod; 2. one end design optionally can be fixed and can flexible rotating dual-purpose apparatus.Between assembly B and assembly C, be provided with a location bar, it is free to rotate that location bar unplugs rear assembly B; After plugging, assembly B is fixing on assembly C.3. also with angle indication dial plate, on assembly B, be carved with index line, can conveniently read the anglec of rotation.The size of device can be set according to measuring wire rod concrete condition.
Making material is selected: because device can contact or be splashed to strong acid unavoidably, optimal selection is various acidproof materials.Such as the teflon that inventor adopts, both acidproof, light again; Also can adopt Ti alloy material that can resistance to strong acid etc.
Fig. 3 is that inventor is used as measurement wire diameter 0.2mm ~ 2mm left and right, and the servicing unit pictorial diagram of the superconducting wire torque of torque <50mm, measures torque as needs and be greater than 50mm wire rod, needs to strengthen the length of assembly D.
Three, measuring process
Concrete operation step is as follows:
Step 1: dress sample
Assembly A is pushed into assembly D one end and is alignd, fix with bolt.Get length of wire sample, clean up, through the middle aperture of assembly A and B, hole diameter is 2mm.Tension wire rod after by its two ends on bolt, tighten; Dress sample is complete.Attention: be applicable to big or small plastic flexible pipe if sample wire diameter, below 1mm, can be put at wire rod two ends, then through aperture, wire rod can significantly not rock in aperture like this.In order to prevent that strong acid from too much corroding sample, estimating that the two ends, region that will corrode put the plastic flexible pipe protection of being close to wire rod, see Fig. 4 a) in addition;
Step 2: corrosion
Unclamp the bolt of fixation kit A, in the middle of it is pushed into, bending sample, fixes assembly A with bolt simultaneously, sees Fig. 4 b);
Sample sweep is immersed in the salpeter solution of volume ratio 40% ~ 60%, until inner core silk scatter completely, nothing bonds.See Fig. 4 c);
Step 3: clean with dry
The sample that corrodes is taken out, repeatedly rinse with circulating water, then with dehydration of alcohol.Sample can be selected to leave standstill natural air drying, or dries up by hot blast gentleness.
Step 4: measure
After sample parches completely, assembly A is pushed back and puts device one end position, with Bolt to position and tighten.Now assembly A in step 1 same position.The measurement partial-length l that is corroded, Fig. 4 d).
Unclamp the location bar of assembly B and assembly C, observe wire rod direction of lay, the assembly B if dextrorotation turns clockwise, is shown in Fig. 4 e), otherwise also anti-.Rotation limit, limit is observed, until the twisting of wire core silk is untied completely, all core silks are parallel shape.Judge that the method whether twisting untie is completely as follows: get a thin hard paper, provoke a thread core silk in the visible one end of core silk, slide to the other end, can be directly to while reaching the other end correspondence position core silk completely parallel.The angle θ of record rotation.And calculate torque L
p
Part II: in conjunction with the feasibility of concrete case illustration method
With ITER Ф 0.73mm, core filament diameter 8 μ m, the NbTi/Cu composite wire torque measurement of 2600 cores is example.
Step 1: dress sample
Assembly A is pushed into assembly D one end and is alignd, fix with bolt.Get length of wire sample, clean up, because gauge or diameter of wire is less, plastic flexible pipe is put on again through the middle aperture of assembly A and B in two ends, strains after wire rod its two ends on bolt, tightens.
Step 2: corrosion
Unclamp the bolt of fixation kit A, in the middle of it is pushed into, bending sample, fixes assembly A with bolt simultaneously.Sample sweep is immersed in the salpeter solution of volume ratio 60%, soak after 20 minutes and take out, inner core silk scatter completely, and without bonding.
Step 3: clean with dry
The sample that corrodes is taken out, repeatedly rinse with circulating water, then with dehydration of alcohol.Slowly blow sample approximately 3 minutes with hot blast, sample bone dry.
Step 4: measure
Assembly A is pushed back and puts device one end position, with Bolt to position and tighten.Now assembly A in step 1 same position.The measurement partial-length l=131.2mm that is corroded.
Unclamp the location bar of assembly B and assembly C, observe wire rod direction of lay, wire rod dextrorotation, assembly B turns clockwise.Get a hard paper by the method judgement of introducing in Part II, all core silks have been parallel shape, record rotating cycle 9 and enclose, 284 ° of dial readings, total angle θ=3524 °.And calculate torque L
p=13.4mm.The design torque of wire rod is between 13.3mm ~ 13.6mm.Measured value is within its scope.
Part III: reliability prove
Get an ITER Ф 0.73mm, core filament diameter 8 μ m, the NbTi/Cu composite wire of 2600 cores, is cut into four sections, and four operating personnel measure according to Part II step, prove its repeatability and precision, and result is as follows:
The relative standard uncertainty of measurement result is 0.3%, favorable repeatability.
Part IV: example demonstration
NbTi/Cu super-conduct composite line material torque measurement for example 1:ITER
See second and Part III.
Interior tin method Nb for example 2:ITER
3sn wire rod torque measurement
Interior tin method Nb for ITER
3sn wire rod, wire diameter 0.821mm, core filament diameter approximately 6 μ m, 3000 cores, design torque is between 16.1mm ~ 16.5mm.
Compare NbTi/Cu composite wire, interior tin method Nb
3it has one deck Nb barrier layer Sn wire rod in the outside of core silk, after outer ring copper resistant strata corrodes, this one deck barrier layer hampers nitric acid and continues the inner copper of corrosion.Therefore, measure interior tin method Nb
3the step of Sn wire rod torque has some differences, specific as follows:
Step 1: prepare before measuring
The outer copper layer corrosion of sample: get one section of sample, put into 60% salpeter solution corrosion, after 15 minutes, surface copper layer dissolves that (Fig. 5 a) completely.Take out sample and rinse with circulating water, dehydration of alcohol hot blast drying.
Barrier layer polishing: get 600 order～1000 order fine sandpapers, uniform grinding needs measure portion, to visible inner coppery, (Fig. 5 b), stops polishing, cleans, and dries up.
Step 2: dress sample
Assembly A is pushed into assembly D one end and is alignd, fix with bolt.Sample is loaded onto, noted polishing part to be contained in corrosion region, because gauge or diameter of wire after corrosion is less, plastic flexible pipe is put on again through the middle aperture of assembly A and B in two ends, strains after wire rod its two ends on bolt, tightens.
Step 3: corrosion again
Unclamp the bolt of fixation kit A, in the middle of it is pushed into, bending sample, fixes assembly A with bolt simultaneously.Sample sweep is immersed in the salpeter solution of volume ratio 60%, soak after 20 minutes and take out, inner core silk scatter completely, and without bonding.
Step 4: clean with dry
The sample that corrodes is taken out, repeatedly rinse with circulating water, then with dehydration of alcohol.Slowly blow sample approximately 3 minutes with hot blast, sample bone dry.
Step 5: measure
Assembly A is pushed back and puts device one end position, with Bolt to position and tighten.Now assembly A in step 1 same position.The measurement partial-length l=128.9mm that is corroded.Unclamp the location bar of assembly B and assembly C, observe wire rod direction of lay, wire rod dextrorotation, assembly B turns clockwise.Get a hard paper by the method judgement of introducing in Part II, all core silks have been parallel shape.Record rotating cycle 7 and enclose, 338 ° of dial readings, total angle θ=2858 °.And calculate torque L
p=16.2mm.The design torque of wire rod is between 16.1mm ~ 16.5mm.Measured value is within its scope.
Example 3:MRI bandlet torque measurement
MRI bandlet is the one of NbTi/Cu super-conduct composite line.Its operation steps is identical with NbTi/Cu super-conduct composite line with ITER.Institute's test sample product are of a size of: 1.20mm × 0.75mm, design torque 45mm, core filament diameter 25 μ m, 630 cores.
Measurement the data obtained is as follows
L=158.4mm, has rotated 3 circles, 182 ° of dial readings, and 1262 ° of total number of degrees, calculate torque L
p=45.2mm.
Claims (1)
1. measure a device for low-temperature superconducting wire torque, comprise turning knob (4), characterized by further comprising slide block (1), support bar (2), angle display disc (3); Support bar (2), for the pipe with notch, slide block (1) embeds in pipe, is with support bar (2) and is slidably connected; One end of support bar (2) is provided with angle display disc (3) and turning knob (4); The center of described slide block (1) and turning knob (4) is provided with through hole, and through hole edge is provided with the screw of fixing tested wire rod; The notch size of described support bar (2) is less than the diameter of support bar (2); The measuring method that uses the device of described measurement low-temperature superconducting wire torque, step is as follows:
Step 1: get one section of tested wire rod sample, by tested wire rod sample tension;
Step 2: tested wire rod sample middle part is carried out corroding in the bending rear salpeter solution that immerses volume ratio 40%～60%, until inner core silk disperses;
Step 3: the tested wire rod sample corroding is taken out, repeatedly rinse with circulating water, then to leave standstill natural air drying after dehydration of alcohol, or dry up by hot blast gentleness;
Step 4: tested wire rod sample is strained again, measured the partial-length l that is corroded;
Step 5: the one end that rotates tested wire rod sample is untied the twisting of wire core silk, and all core silks are parallel shape; The angle θ of record rotation, calculates torque
wherein:
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| CN102841023B true CN102841023B (en) | 2014-10-08 |
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