CN112327229B - Twisting device and method for detecting twisting performance of high-temperature superconducting tape - Google Patents
Twisting device and method for detecting twisting performance of high-temperature superconducting tape Download PDFInfo
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- CN112327229B CN112327229B CN202011137147.7A CN202011137147A CN112327229B CN 112327229 B CN112327229 B CN 112327229B CN 202011137147 A CN202011137147 A CN 202011137147A CN 112327229 B CN112327229 B CN 112327229B
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- 238000000034 method Methods 0.000 title claims description 23
- 238000004804 winding Methods 0.000 claims abstract description 67
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 230000001351 cycling effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 239000002887 superconductor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1238—Measuring superconductive properties
- G01R33/1246—Measuring critical current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/26—Investigating twisting or coiling properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
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Abstract
The invention discloses a twisting device for detecting twisting performance of a high-temperature superconducting tape, which comprises a twisting mechanism and a tape winding and unwinding mechanism, wherein the twisting mechanism is used for winding the high-temperature superconducting tape; the twisting mechanism comprises a first bracket, a mandrel and a first motor, and a plurality of clamps are further arranged on the mandrel; the belt winding and unwinding mechanism comprises a second base, a belt winding and unwinding bracket and a belt winding and unwinding power assembly; at least one screw rod is rotatably arranged on the second base, a winding and unwinding belt bracket is sleeved on the screw rod, a second motor is arranged at one end of the screw rod, the second motor rotates and drives the screw rod to rotate, and the screw rod rotates and drives the winding and unwinding belt bracket to move; the winding and unwinding belt power assembly comprises a rotating shaft which is rotatably arranged on the winding and unwinding belt support, one end of the rotating shaft is fixedly provided with a winding disc, the other end of the rotating shaft is provided with a third motor for driving the rotating shaft to rotate, and a tension controller is further arranged on the rotating shaft. The device can test the critical current of the high-temperature superconductive tape in a certain twisting state so as to test the twisting resistance, stability and reliability of the superconductive tape.
Description
Technical Field
The invention relates to the technical field of superconducting cables, in particular to a twisting device and a detection method for detecting twisting performance of a high-temperature superconducting tape.
Background
Along with the continuous deep research of high-temperature superconducting materials and the continuous improvement of the preparation technology of high-temperature superconducting tapes, the application of the high-temperature superconducting tapes is gradually realized. At present, high-temperature superconducting tapes are mainly used for superconducting magnets and superconducting power technologies.
The superconducting layer of the high-temperature superconducting material is a ceramic structure, and is inevitably affected by continuous strain such as stretching, bending and twisting in the process of preparing, transporting and winding into a superconducting cable or a superconducting magnet and in the application process thereof. When the superconducting material is subjected to strain such as continuous stretching, bending and twisting, the crystal structure of the superconducting material is changed, thereby causing defects of the superconducting tape. When the superconducting cable or the superconducting magnet works, certain heat is generated when current passes through the defect position, and the heat dissipated by the superconducting cable or the superconducting magnet cannot be conducted in time to heat up the superconducting material, so that the superconductor is converted from a superconducting state to a normal state, and quench occurs. Studies have shown that after a superconductor experiences a local quench, the normal state of the location propagates in the direction of current transport, and the propagation speed of the normal state is the quench propagation speed. Compared with a low-temperature superconducting tape, the high-temperature superconducting tape has slower quench propagation speed, and the slow quench propagation speed leads to easier heat accumulation after the tape is quenched, so that more heat cannot be eliminated through conduction, the superconductor is more easily quenched, and the superconducting devices or superconducting equipment are more easily destroyed. Therefore, with the popularization of the application of the high-temperature superconducting material in the superconducting magnet and the superconducting power, the requirements on the mechanical properties such as tensile property, bending resistance and torsion resistance of the superconducting material in the market are also higher and higher.
However, there is no specific method in the prior art for realizing the twisting test of the high temperature superconductive tape and testing the critical current of the tape after continuous operation under different twisting states. The design experiment according to the special working environment of the high-temperature superconducting tape is needed to detect the performance of the high-temperature superconducting tape after continuous working under different twisting states and verify the application reliability of the superconducting tape, so that the high-temperature superconducting tape has important reference value for industrialization of superconducting magnets and superconducting power technology.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a twisting device and a detection method for detecting the twisting performance of a high-temperature superconducting tape, which can test the critical current of the high-temperature superconducting tape in a certain twisting state and check the twisting resistance, stability and reliability of the superconducting tape.
In order to achieve the above purpose, the present invention provides the following technical solutions: a twisting device for detecting twisting performance of the high-temperature superconducting tape, comprising a twisting mechanism and a tape winding and unwinding mechanism arranged at one side of the twisting mechanism;
The twisting mechanism comprises a first bracket, a mandrel rotatably arranged on the first bracket, and a first motor for driving the mandrel to rotate, and a plurality of clamps for fixing superconducting strips are further arranged on the mandrel;
The belt winding and unwinding mechanism comprises a second base, a belt winding and unwinding bracket arranged on the second base and a belt winding and unwinding power assembly arranged on the belt winding and unwinding bracket;
The second base is rotatably provided with at least one screw, the screw is sleeved with the winding and unwinding belt support, the winding and unwinding belt support is in threaded connection with the screw, the winding and unwinding belt support is slidably arranged on the second base in a circumferential limiting and axial non-limiting mode, one end of the screw is provided with a second motor, the second motor rotates and drives the screw to rotate, and the screw rotates and drives the winding and unwinding belt support to move on the second base;
the winding and unwinding belt power assembly comprises a rotating shaft which is arranged on a winding and unwinding belt support in a rotating mode, a winding disc is fixed at one end of the rotating shaft, a third motor which is used for driving the rotating shaft to rotate is arranged at the other end of the rotating shaft, a motor shaft of the third motor is fixedly connected with the rotating shaft, and a tension controller is further arranged on the rotating shaft.
The device can test the critical current of the high-temperature superconductive tape in a certain twisting state so as to test the twisting resistance, stability and reliability of the superconductive tape, has strong applicability, can be used for twisting experiments of various high-temperature superconductive tapes, and has strong operability, low cost and simple and controllable equipment.
Preferably, the twisting mechanism further comprises a first base, wherein a circular arc guide rail is fixed on the first base, a circular arc groove matched with the circular arc guide rail is formed in the bottom of the first support, the circular arc guide rail on the first base is embedded into the circular arc groove on the first support, and the first support can circumferentially rotate along the circular arc guide rail; the first base is also provided with a locking mechanism for locking the first bracket on the first base.
Preferably, the locking mechanism comprises a fastener, a threaded hole communicated with the circular arc-shaped groove is formed in the first base, and the fastener is in threaded connection with the threaded hole; the fastener is rotated to prop against the circular arc guide rail, so that the first bracket can be locked on the first base.
Preferably, a plurality of positioning holes matched with the fastening pieces are formed in the circular arc-shaped guide rail at intervals.
Preferably, the winding and unwinding belt support comprises a sliding block sleeved on the screw rod, the sliding block is in threaded connection with the screw rod, a third supporting plate is fixed on the sliding block, and the rotating shaft is rotatably arranged on the third supporting plate.
Preferably, the second base is provided with two screws in a rotating mode, the two screws are arranged in parallel, and the two screws are in threaded connection with the retractable belt support.
Preferably, the mandrel is fixedly connected with a motor shaft of the first motor through a first coupling.
Preferably, the rotating shaft is fixedly connected with a motor shaft of the third motor through a second coupler.
Preferably, the first bracket comprises a first bottom plate, a first supporting plate and a second supporting plate, wherein the first supporting plate and the second supporting plate are fixed on the first bottom plate, one end of the mandrel is rotatably arranged on the first supporting plate, a first semicircular groove is formed in the upper end of the second supporting plate, a locking plate part is arranged at the upper end of the second supporting plate through a fastener, a second semicircular groove is formed in the locking plate part, the first semicircular groove and the second semicircular groove are matched to form a shaft hole, and the other end of the mandrel is rotatably arranged in the shaft hole.
Preferably, the method for detecting the twist performance of the high temperature superconducting tape, using the above-described twist device for detecting the twist performance of the high temperature superconducting tape, comprises the steps of:
Step 1), taking a section of superconducting strip to be tested, and respectively welding a current lead and a voltage lead on the superconducting strip;
step 2), measuring and recording critical current Ic 0 of the superconducting tape in the step 1) in a straight state by using a four-lead method;
Step 3), coiling one end of the superconducting tape in the step 1) on a tape coiling disc, and fixing the other end of the superconducting tape on a mandrel with the radius R through a clamp; adjusting the position of the mandrel and enabling the included angle between the length direction of the superconducting strip and the mandrel to be theta;
step 4), starting a first motor, and enabling the first motor to rotate and drive the mandrel to rotate so as to enable the superconducting tape to wind along the surface of the mandrel;
Step 5), simultaneously, starting a third motor, wherein the third motor drives the take-up disc to rotate and enables the take-up disc to release the superconducting tape, and the tension state of the superconducting tape on the mandrel is maintained through a tension controller;
step 6), simultaneously, starting a second motor, rotating and driving a screw rod to rotate, and driving a sliding block to move by rotating the screw rod, so as to drive a winding and unwinding belt power assembly to move, and keeping theta unchanged;
step 7), after winding is finished, fixing the superconducting tape on the mandrel by using another clamp, and keeping the superconducting tape in a twisted state;
Step 8), measuring and recording critical current Ic S of the superconducting tape in the twisting state in the step 7) by using a four-wire method;
Step 9), keeping the superconducting tape in the twisted state in the step 8), soaking the superconducting tape in liquid nitrogen, testing the critical current Ic Ei of the soaked superconducting tape every 10 days, and recording;
Step 10), recycling the step 9) for a plurality of times or taking down the superconducting tape after the superconducting tape is quenched; the critical current retention is calculated from the critical current tested and plotted to measure the twist resistance, stability and reliability of the strip.
In summary, the invention has the following beneficial effects:
1. The invention can verify the application reliability of the superconducting tape, detect the performance of the superconducting tape after continuous operation, and can be used for verifying the twisting resistance, stability and reliability of the superconducting tape;
2. the invention realizes the direct critical current test of the superconducting tape in a certain twisting state;
3. The twisting device has strong applicability and can be used for twisting experiments of various high-temperature superconducting tapes;
4. The twisting device has strong operability, low cost and simple and controllable equipment.
5. The twisting device is convenient for replacing the mandrel, so that the critical current of the superconducting tape under the condition of different radii R can be tested;
6. The twisting device provided by the invention is convenient for adjusting the position of the mandrel to change the torsion angle theta, so that the critical current of the superconducting tape in different torsion angle theta states can be tested.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the twisted structure of the present invention assembled on a first base;
FIG. 3 is a schematic diagram of a twisting mechanism according to the present invention;
FIG. 4 is a schematic view of a tape winding and unwinding mechanism according to the present invention;
FIG. 5 is an enlarged view of FIG. 3 at A;
FIG. 6 is a schematic illustration of the twisting of the superconducting tape of the present invention on a mandrel;
fig. 7 is a graph of the critical current retention δ2 obtained by the test.
Reference numerals: 1. a twisting mechanism; 2. a tape winding and unwinding mechanism; 3. a first bracket; 4. a mandrel; 5. a first motor; 6. a motor bracket; 7. a superconducting tape; 8. a clamp; 9. a second base; 10. a tape bracket is retracted and released; 11. a screw rod; 12. a second motor; 13. a rotating shaft; 14. a take-up reel; 15. a third motor; 16. a tension controller; 17. a first base; 18. a circular arc guide rail; 19. a slide block; 20. a third support plate; 21. a first base plate; 22. a first support plate; 23. a second support plate; 24. a guide block; 25. circular arc grooves; 26. and a locking plate part.
Detailed Description
The invention is further described with reference to the accompanying drawings.
The present embodiment discloses a twisting device and a detection method for detecting the twisting performance of a high temperature superconducting tape, as shown in fig. 1 to 5, the twisting device includes a twisting mechanism 1 and a tape winding and unwinding mechanism 2 provided on one side of the twisting mechanism 1; the twisting mechanism 1 comprises a first bracket 3, a mandrel 4 rotatably arranged on the first bracket 3, and a first motor 5 for driving the mandrel 4 to rotate; the first motor 5 is fixed on the first bracket 3 through a motor bracket 6, one end of the mandrel 4 is fixedly connected with a motor shaft of the first motor 5 through a first coupler, and a plurality of hoops 8 for fixing the superconducting tape 7 are also arranged on the mandrel 4; the belt winding and unwinding mechanism 2 comprises a second base 9, a belt winding and unwinding bracket 10 arranged on the second base 9, and a belt winding and unwinding power assembly arranged on the belt winding and unwinding bracket 10; at least one lead screw 11 is rotatably arranged on the second base 9, a winding and unwinding belt bracket 10 is sleeved on the lead screw 11, the winding and unwinding belt bracket 10 is in threaded connection with the lead screw 11, and the winding and unwinding belt bracket 10 is slidably arranged on the second base 9 in a circumferential limit and axial non-limit mode, so that the winding and unwinding belt bracket 10 can slide back and forth on the second base 9 without circumferential rotation; a second motor 12 is arranged at one end of the lead screw 11, the second motor 12 rotates and drives the lead screw 11 to rotate, and the lead screw 11 rotates and drives the winding and unwinding belt bracket 10 to move on the second base 9; the winding and unwinding belt power assembly comprises a rotating shaft 13 which is rotatably arranged on a winding and unwinding belt support 10, a winding disc 14 is fixed at one end of the rotating shaft 13, a third motor 15 for driving the rotating shaft 13 to rotate is arranged at the other end of the rotating shaft 13, a motor shaft of the third motor 15 is fixedly connected with the rotating shaft 13 through a second coupling, and a tension controller 16 is further arranged on the rotating shaft 13. Tension control is an important technology in the winding and unwinding process of various strips, wires and cables, such as adhesive tapes, metal foil tapes, wires and cables, and the like, and the tension controller in the application is a tension controller for the strips, which is common in the prior art.
The device can test the critical current of the high-temperature superconducting tape 7 in a certain twisting state so as to test the twisting resistance, stability and reliability of the superconducting tape 7, has strong applicability, can be used for twisting experiments of various high-temperature superconducting tapes 7, and has strong operability, low cost and simple and controllable equipment.
Preferably, the twisting mechanism 1 further comprises a first base 17, the first base 17 is fixed with a circular arc guide rail 18, the bottom of the first bracket 3 is provided with a circular arc groove 25 matched with the circular arc guide rail 18, the circular arc groove 25 on the first bracket 3 is embedded in the circular arc guide rail 18 on the first base 17, the circular arc guide rail 18 on the first base 17 is embedded in the circular arc groove 25 on the first bracket 3, and the first bracket 3 can circumferentially rotate along the circular arc guide rail 18; the first base 17 is further provided with a locking mechanism for locking the first bracket 3 to the first base 17. The first bracket 3 is rotated on the first base 17 by rotating, and the relative position between the first base 17 and the first bracket 3 is locked by a locking mechanism and kept unchanged; in this way, the position of the mandrel 4 is conveniently adjusted to change the torsion angle θ, so that the critical current of the superconducting tape 7 in different torsion angle θ states can be tested. The locking mechanism comprises a fastener, a threaded hole communicated with the circular arc-shaped groove 25 is formed in the first base 17, and the fastener is in threaded connection with the threaded hole; the fastener is rotated to be propped against the circular arc-shaped guide rail 18, so that the first bracket 3 can be locked on the first base 17; further, a plurality of positioning holes matched with the fasteners are formed in the circular arc-shaped guide rail 18 at intervals, after the position of the mandrel 4 is adjusted, the fasteners are rotated to be embedded into the positioning holes in the circular arc-shaped guide rail 18, and then the relative positions of the first base 17 and the first bracket 3 are locked.
The winding and unwinding belt bracket 10 is slidably arranged on the second base 9 in a circumferential limit and axial non-limit mode, specifically, when a screw rod 11 is rotationally arranged on the second base 9, the bottom of the winding and unwinding belt bracket 10 is propped against the second base 9 and the winding and unwinding belt bracket 10 is limited to rotate, so that when the screw rod 11 rotates and drives the winding and unwinding belt bracket 10 to move, the circumferential rotation of the winding and unwinding belt bracket 10 is limited due to the acting force of the second base 9; or rotate on the second base 9 and set up two lead screws 11, two lead screws 11 mutual parallel arrangement, and two lead screws 11 all with receive and release tape holder 10 threaded connection, so, on the one hand, can avoid receive and release tape holder 10 to take place circumference rotation, on the other hand, two lead screws 11 all with receive and release tape holder 10 threaded connection, can make receive and release tape holder 10's removal more steady. In the above technical scheme, the tape winding and unwinding bracket 10 comprises a slider 19 sleeved on the screw rod 11, the slider 19 is in threaded connection with the screw rod 11, a third support plate 20 is fixed on the slider 19, and the rotating shaft 13 is rotatably arranged on the third support plate 20.
In order to facilitate the replacement of the mandrels 4 with different radii R, the mandrels 4 are detachably and rotatably arranged on the first bracket 3, specifically, the first bracket 3 comprises a first bottom plate 21, a first supporting plate 22 and a second supporting plate 23 fixed on the first bottom plate 21, a plurality of guide blocks 24 are fixed on the bottom of the first bottom plate 21, the plurality of guide blocks 24 are arranged at intervals along the sliding path of the first bracket 3, and circular arc grooves 25 are formed in the guide blocks 24; one end of the mandrel 4 is rotatably arranged on the first support plate 22, a first semicircular groove is formed in the upper end of the second support plate 23, a locking plate portion 26 is arranged at the upper end of the second support plate 23 through a fastener, a second semicircular groove is formed in the locking plate portion 26, the first semicircular groove and the second semicircular groove are matched to form a shaft hole, the other end of the mandrel 4 is rotatably arranged in the shaft hole, and therefore the mandrel 4 is convenient to replace, and then critical currents of superconducting tapes 7 under different radius R conditions can be tested.
The method for detecting the twist performance of the high temperature superconducting tape 7, using the above-described twist device for detecting the twist performance of the high temperature superconducting tape 7, comprises the steps of:
Step 1), taking a section of superconducting strip 7 to be tested, and welding current lead tapes and voltage lead wires with the same width on two ends of the superconducting strip 7 by using soldering flux so as to reduce the contact resistance between an electrode and the strip and avoid burning near the electrode caused by overlarge contact resistance in a critical current experiment; the welding spot is required to have no defects such as virtual joint, bubbles and the like;
Step 2), welding two voltage poles on the superconducting tape 7 in the step 1) by using soldering flux, wherein the distance between the two voltage poles is L=50 cm, measuring critical current Ic 0 of the superconducting tape 7 to be measured in a straight state by using a four-lead method, and ensuring a certain distance by using a voltage lead inside a current lead;
Step 3) coiling one end of the superconducting tape 7 in step 1) on a take-up reel 14; meanwhile, at the position 10cm away from the initial end of the superconducting tape 7, the other end of the superconducting tape 7 is fixed on a mandrel 4 with the radius R through a clamp 8, wherein R is more than or equal to 15mm; the position of the mandrel 4 is adjusted, and the included angle between the length direction of the superconducting strip 7 and the mandrel 4 is theta, namely the torsion angle is theta, and theta is 20-60 degrees;
Step 4), starting a first motor 5, and enabling the first motor 5 to rotate and drive the mandrel 4 to rotate so as to enable the superconducting tape 7 to wind along the surface of the mandrel 4;
Step 5), simultaneously, the third motor 15 is started, the third motor 15 drives the second motor 12, the second motor 12 drives the take-up reel 14 to rotate and enables the take-up reel 14 to release the superconducting tape 7, and the tension state of the superconducting tape 7 on the mandrel 4 is maintained through the tension controller 16;
step 6), simultaneously, starting a second motor 12, wherein the second motor 12 rotates and drives a screw rod 11 to rotate, and the screw rod 11 rotates and drives a sliding block 19 to move, so that a winding and unwinding belt power assembly is driven to move, and theta is kept unchanged;
Step 7), after winding is finished, fixing the superconducting tape 7 on the mandrel 4 by using another clamp 8, keeping the superconducting tape 7 in a twisted state, and cutting the superconducting tape 7 at a position 810cm away from the clamp; the twisted state of the superconducting tape 7 on the mandrel 4 as shown in fig. 6;
Step 8), measuring and recording critical current Ic S of the superconducting tape 7 in the twisted state in the step 7) by using a four-wire method;
step 9), keeping the superconducting tape 7 in the twisted state in the step 8), immersing the superconducting tape 7 in liquid nitrogen, testing the critical current I CEi of the immersed superconducting tape 7 every 10 days, and recording;
Step 10), cycling step 9) 10 times or after quench of the superconducting tape 7, removing the superconducting tape 7; calculating a critical current retention δ1= (Ic S/Ic0)*100％,δ2＝(IcEi/IcS) ×100%, wherein δ1 is used to verify whether the superconducting tape 7 is damaged after being twisted, and plotting a relationship between δ2 and a soaking time; the critical current retention is calculated from the critical current tested and plotted to measure the twist resistance, stability and reliability of the strip. ( Wherein: ic: a critical current; ic 0: critical current in the initial untwisted state; ic S: critical current of initial twist state; ic E: critical current after button twist state soaking; ic Ei: critical current measured every 8-12 days )
When the experiment is needed, the mandrel 4 and the torsion angle theta of different radiuses R can be respectively changed, and the steps 3) to 10) are repeated; in general, the radius R and the torsion angle θ should be designed according to the actual application of the superconducting tape 7, and may be properly severe in the application. In addition, in the experimental process, good welding performance of the current lead and the voltage lead should be ensured, contact resistance is ensured not to be too large, proper welding temperature should be selected to prevent damage to the superconducting tape 7, proper soldering flux should be selected, and welding firmness of the current lead and the voltage lead is ensured in long-term test.
As shown in FIG. 7, curves a-c respectively show the critical current retention delta 2 versus soaking time of the high temperature superconducting tape 7 under three different twisting conditions, wherein R1 > R2, and theta 1 < theta 2. From the curves a and b, it can be seen that the larger the radius R of the twisting mandrel 4, the better the twisting resistance and the fatigue resistance of the superconducting tape 7, when the torsion angle θ is unchanged. From the curves b and c, it can be seen that the smaller the torsion angle θ, the better the twisting resistance and the fatigue resistance of the superconducting tape 7, when the radius R of the twisted mandrel 4 is unchanged. In the figure, the K line represents that when the critical current retention δ2 is smaller than the critical current retention coefficient K, that is, it is determined that the superconducting tape 7 has reached the fatigue state under this condition, the current retention coefficients K of the different superconducting tapes 7 are different.
The directions in this embodiment are merely for convenience in describing the positional relationship between the respective members and the relationship of mutual cooperation. The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (8)
1. The method for detecting the twisting performance of the high-temperature superconducting tape is characterized by comprising the following steps of: the twisting device for detecting the twisting performance of the high-temperature superconducting tape is utilized, and the steps are as follows:
step 1), taking a section of superconducting strip (7) to be tested, and respectively welding a current lead and a voltage lead on the superconducting strip (7);
step 2), measuring and recording critical current Ic 0 of the superconducting tape (7) in the step 1) in a straight state by using a four-lead method;
step 3), coiling one end of the superconducting tape (7) in the step 1) on a winding disc (14), and fixing the other end of the superconducting tape (7) on a mandrel (4) with the radius R through a clamp (8); adjusting the position of the mandrel (4) and enabling the included angle between the length direction of the superconducting strip (7) and the mandrel (4) to be theta;
step 4), starting a first motor (5), and enabling the first motor (5) to rotate and drive the mandrel (4) to rotate so as to enable the superconducting tape (7) to wind along the surface of the mandrel (4);
Step 5), simultaneously, a third motor (15) is started, the third motor (15) drives a take-up reel (14) to rotate and enable the take-up reel to release the superconducting tape (7), and the tension state of the superconducting tape (7) on the mandrel (4) is maintained through a tension controller (16);
step 6), simultaneously, starting a second motor (12), wherein the second motor (12) rotates and drives a screw rod (11) to rotate, and the screw rod (11) rotates and drives a sliding block (19) to move, so that a winding and unwinding power assembly is driven to move, and theta is kept unchanged;
step 7), after winding is finished, fixing the superconducting tape (7) on the mandrel (4) by using another clamp (8) and keeping the superconducting tape in a twisted state;
Step 8), measuring and recording critical current Ic S of the superconducting tape (7) in the twisted state in the step 7) by using a four-wire method;
Step 9), keeping the superconducting tape (7) in the step 8) in a twisted state, immersing the superconducting tape in liquid nitrogen, testing the critical current Ic E i of the immersed superconducting tape (7) every 10 days, and recording;
step 10), cycling step 9) for a plurality of times or after quench of the superconducting tape (7), removing the superconducting tape (7); calculating a critical current retention rate according to the tested critical current and drawing a curve;
the twisting device for detecting the twisting performance of the high-temperature superconducting tape comprises a twisting mechanism (1) and a tape winding and unwinding mechanism (2) arranged on one side of the twisting mechanism (1);
The twisting mechanism (1) comprises a first bracket (3), a mandrel (4) rotatably arranged on the first bracket (3) and a first motor (5) for driving the mandrel (4) to rotate; a plurality of hoops (8) for fixing the superconducting tape (7) are also arranged on the mandrel (4);
the belt winding and unwinding mechanism (2) comprises a second base (9), a belt winding and unwinding bracket (10) arranged on the second base (9), and a belt winding and unwinding power assembly arranged on the belt winding and unwinding bracket (10);
The device is characterized in that at least one screw rod (11) is rotatably arranged on the second base (9), the screw rod (11) is sleeved with the winding and unwinding belt support (10), the winding and unwinding belt support (10) is in threaded connection with the screw rod (11), the winding and unwinding belt support (10) is slidably arranged on the second base (9) in a circumferential limiting and axial non-limiting mode, a second motor (12) is arranged at one end of the screw rod (11), the second motor (12) rotates and drives the screw rod (11) to rotate, and the screw rod (11) rotates and drives the winding and unwinding belt support (10) to move on the second base (9);
The belt winding and unwinding power assembly comprises a rotating shaft (13) rotatably arranged on a belt winding and unwinding bracket (10), a belt winding disc (14) is fixed at one end of the rotating shaft (13), a third motor (15) for driving the rotating shaft (13) to rotate is arranged at the other end of the rotating shaft (13), a motor shaft of the third motor (15) is fixedly connected with the rotating shaft (13), and a tension controller (16) is further arranged on the rotating shaft (13);
The twisting mechanism (1) further comprises a first base (17), a circular arc guide rail (18) is fixed on the first base (17), a circular arc groove (25) matched with the circular arc guide rail (18) is formed in the bottom of the first support (3), the circular arc guide rail (18) on the first base (17) is embedded into the circular arc groove (25) on the first support (3), and the first support (3) can circumferentially rotate along the circular arc guide rail (18); the first base (17) is also provided with a locking mechanism for locking the first bracket (3) on the first base (17);
The current lead and the voltage lead are welded on the superconducting tape (7) to be tested respectively, one end of the superconducting tape (7) is coiled on the take-up reel (14), and the other end of the superconducting tape (7) is fixed on the mandrel (4) with the radius of R through the clamp (8).
2. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 1, characterized by: the locking mechanism comprises a fastener, a threaded hole communicated with the circular arc-shaped groove (25) is formed in the first base (17), and the fastener is in threaded connection with the threaded hole; the fastener is rotated to abut against the circular arc-shaped guide rail (18), so that the first bracket (3) can be locked on the first base (17).
3. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 2, characterized by: a plurality of positioning holes matched with the fastening pieces are formed in the circular arc-shaped guide rail (18) at intervals.
4. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 1, characterized by: the winding and unwinding belt support (10) comprises a sliding block (19) sleeved on the screw rod (11), the sliding block (19) is in threaded connection with the screw rod (11), a third supporting plate (20) is fixed on the sliding block (19), and the rotating shaft (13) is rotatably arranged on the third supporting plate (20).
5. The method for detecting the twist property of a high-temperature superconducting tape according to claim 4, characterized by: the second base (9) is rotatably provided with two lead screws (11), the two lead screws (11) are mutually parallel, and the two lead screws (11) are in threaded connection with the winding and unwinding belt support (10).
6. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 1, characterized by: the mandrel (4) is fixedly connected with a motor shaft of a first motor (5) through a first coupler.
7. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 1, characterized by: the rotating shaft (13) is fixedly connected with a motor shaft of a third motor (15) through a second coupler.
8. The method for detecting the twist performance of a high-temperature superconducting tape according to claim 1, characterized by: the first support (3) comprises a first bottom plate (21), a first support plate (22) and a second support plate (23), wherein the first support plate (22) and the second support plate (23) are fixed on the first bottom plate (21), one end of the mandrel (4) is rotatably arranged on the first support plate (22), a first semicircular groove is formed in the upper end of the second support plate (23), a locking plate portion (26) is arranged at the upper end of the second support plate (23) through a fastener, a second semicircular groove is formed in the locking plate portion (26), the first semicircular groove and the second semicircular groove are matched to form a shaft hole, and the other end of the mandrel (4) is rotatably arranged in the shaft hole.
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| CN118859054B (en) * | 2024-07-02 | 2025-03-07 | 曼特(广州)磁性器件有限公司 | A magnetic testing device for nanocrystalline strips |
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| CN110118681A (en) * | 2019-05-13 | 2019-08-13 | 安徽理工大学 | It is a kind of for producing the device and method of different sizes and dip of joint rock sample |
| CN111537927A (en) * | 2020-06-28 | 2020-08-14 | 合肥工业大学 | Critical current testing device and method in spiral wound state of high temperature superconducting tape |
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| CN1244816C (en) * | 2002-10-15 | 2006-03-08 | 北京有色金属研究总院 | Superconductor high-temperature strip critical current measurnig method and apparatus |
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| JP6379734B2 (en) * | 2014-06-27 | 2018-08-29 | 住友電気工業株式会社 | Tape tension control method and tape winding material manufacturing method |
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| CN110118681A (en) * | 2019-05-13 | 2019-08-13 | 安徽理工大学 | It is a kind of for producing the device and method of different sizes and dip of joint rock sample |
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