CN211206346U - Continuous nondestructive testing equipment for local defects of superconducting cable - Google Patents
Continuous nondestructive testing equipment for local defects of superconducting cable Download PDFInfo
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- CN211206346U CN211206346U CN201820303797.6U CN201820303797U CN211206346U CN 211206346 U CN211206346 U CN 211206346U CN 201820303797 U CN201820303797 U CN 201820303797U CN 211206346 U CN211206346 U CN 211206346U
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- 230000007547 defect Effects 0.000 title claims abstract description 19
- 238000009659 non-destructive testing Methods 0.000 title description 3
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 238000009472 formulation Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a continuous nondestructive test equipment of superconducting cable local defect, its characterized in that: a pay-off wheel and a take-up wheel are respectively arranged at the upper left and the upper right of the Dewar, the shaft of the pay-off wheel is connected with a damper, and the shaft of the take-up wheel is connected with a stepping motor; a first guide wheel, an excitation coil, a magnetic field detector and a second guide wheel are sequentially arranged in the Dewar from left to right; the magnetic field detector is a square Hall sensor array formed by four rows of Hall sensors, namely a front row, a rear row, an upper row and a lower row; after the superconducting cable on the pay-off wheel extends out, the superconducting cable firstly bypasses the first guide wheel, then sequentially passes through the excitation coil and the center of the magnetic field detector, then bypasses the second guide wheel and finally is wound on the take-up wheel. The device can continuously and nondestructively detect the local defects of the superconducting cable, thereby providing reliable test data for formulation of a stranding process of the superconducting cable and use and maintenance of the superconducting cable, and further ensuring the performance and reliability of the superconducting magnet.
Description
Technical Field
The utility model relates to a detection equipment of superconducting cable.
Background
The large superconducting magnet can provide a strong magnetic field in a large space and hardly consume electric energy, and is widely applied to the fields of high-energy ion accelerators, nuclear fusion, magnetohydrodynamic power generation and the like. The superconducting magnet is mainly formed by winding a Cable-in-Conductor (CICC). The cable conductor in the pipe is composed of a superconducting cable formed by multi-stage twisting of superconducting strands, a central cooling hole and an outer sleeve. The performance of the superconducting cable directly determines whether the prepared magnet can normally operate or not and the strength of a magnetic field generated by the superconducting magnet. During the twisting of the superconducting cable, the superconducting strands may be subjected to stresses of various degrees, which may cause local defects in the superconducting cable, at which local performance degradation (critical current reduction) occurs. Therefore, it is necessary to perform a nondestructive test on the performance of the superconducting cable so as to obtain the relationship between the twisting process condition and the local defect of the superconducting cable, thereby providing reliable experimental data for the formulation of the stranding process of the superconducting cable. Meanwhile, nondestructive detection of local defects is required in the use and maintenance process of the superconducting cable, so that whether the prepared superconducting cable is qualified or not is determined, and the performance of the equipment for testing the superconducting cable is further ensured.
The existing superconducting performance nondestructive detection equipment is characterized in that a single superconducting tape or a single superconducting wire is magnetized, then the superconducting tape or the superconducting wire passes through one side of a Hall sensor, the Hall sensor continuously measures the residual magnetic field of the superconducting tape or the superconducting wire passing through the Hall sensor to obtain uniform or basically uniform residual magnetic field axial distribution of the superconducting tape or the superconducting wire, further obtain the axial distribution of critical current of the single superconducting tape or the superconducting wire, and when the axial distribution has obvious sinking, namely the critical current at a certain position is obviously low, the superconducting tape or the superconducting wire can be judged to have local defects at the position, and the performance of the superconducting tape or the superconducting wire is degraded. The method has high measurement efficiency and high spatial resolution. The superconducting cable is formed by multi-stage twisting of superconducting strands, and when the superconducting cable continuously passes by the nearby Hall sensor, the section of the nearest superconducting part of the superconducting cable is not the same, but is a non-circular shape with continuous torsion (rotation) change; therefore, the residual magnetic field continuously measured by the Hall sensor is not uniform, and great fluctuation change can be generated; thereby masking the residual magnetic field variation generated by the local defect and failing to detect the local defect of the superconducting cable.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a superconducting cable's local defect is nondestructive test equipment in succession, this equipment can detect out superconducting cable's local defect in succession harmlessly to for the formulation of superconducting cable's stranded cable technology and superconducting cable's use is maintained, provide reliable test data, and then guarantee superconducting magnet's performance and reliability.
The utility model discloses the technical scheme who adopts of realizing its invention purpose is, a continuous nondestructive test equipment of superconducting cable local defect, its characterized in that:
a pay-off wheel and a take-up wheel are respectively arranged at the upper left and the upper right of the Dewar, the shaft of the pay-off wheel is connected with a damper, and the shaft of the take-up wheel is connected with a stepping motor;
a first guide wheel, an excitation coil, a magnetic field detector and a second guide wheel are sequentially arranged in the Dewar from left to right; the magnetic field detector is a square Hall sensor array formed by four rows of Hall sensors, namely a front row, a rear row, an upper row and a lower row;
after the superconducting cable on the pay-off wheel extends out, the superconducting cable firstly bypasses the first guide wheel, then sequentially passes through the excitation coil and the center of the magnetic field detector, then bypasses the second guide wheel and finally is wound on the take-up wheel.
The utility model discloses a working process and principle as follows:
under the driving action of the stepping motor, the superconducting cable on the pay-off wheel moves from left to right after passing through the guide wheel I, then the superconducting cable passing through the excitation coil is magnetized by the magnetic field of the excitation coil, a residual magnetic field is generated after the superconducting cable leaves, and the superconducting cable with the residual magnetic field penetrates through the center of the square Hall sensor array and then penetrates out of the detection outlet of the Dewar.
When the superconducting cable with the residual magnetic field continuously passes through the center of the square Hall array, the Hall sensors at the front, the rear, the upper and the lower parts in the square Hall array sense and detect the magnetic field intensity of the respective positions; the data acquisition control equipment sums the magnetic field intensity measured by the Hall sensors in all directions around the superconducting cable to obtain the omnidirectional sum value of the magnetic field intensity of the superconducting cable, the omnidirectional value of the magnetic field intensity of the superconducting cable eliminates fluctuation change of a residual magnetic field measured by the Hall sensors in a single direction, namely, the omnidirectional value of the magnetic field intensity continuously measured is uniform or basically uniform, so that uniform or basically uniform axial distribution of critical current of the superconducting cable is obtained, and the occurrence of obvious sinking in the axial distribution, namely the critical current at a certain position is obviously lower, so that the local defect of the superconducting cable at the position can be judged, and the performance of the superconducting cable is degraded.
Compared with the prior art, the beneficial effects of the utility model are that:
the magnetic field detector of the utility model is a square Hall sensor array composed of four rows of Hall sensors, namely a front row, a rear row, an upper row and a lower row, when in detection, the superconducting cable continuously passes through the center of the square Hall array, and the magnetic field intensity measured by the Hall sensors in all directions around the superconducting cable is summed to obtain the omnidirectional sum value of the magnetic field intensity; further eliminating and avoiding the covering of the fluctuation change of the residual magnetic field measured by the Hall sensor in a single direction on the residual magnetic field change generated by local defects; the local defects of the superconducting cable can be effectively and accurately detected. Therefore, reliable test data are provided for designing and preparing the local defect resistance of the stranding and extrusion molding process of the superconducting cable and using and maintaining the superconducting cable; thereby ensuring the performance and reliability of the superconducting magnet.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed description of the invention
Examples
Fig. 1 shows, according to an embodiment of the present invention, a continuous nondestructive testing apparatus for local defects of a superconducting cable, which is characterized in that:
a pay-off wheel 1 and a take-up wheel 9 are respectively arranged at the upper left side and the upper right side of the Dewar 3, the shaft of the pay-off wheel 1 is connected with the damper 2, and the shaft of the take-up wheel 9 is connected with a stepping motor;
a guide wheel I4, an excitation coil 5, a magnetic field detector 6 and a guide wheel II 7 are sequentially arranged in the Dewar 3 from left to right; the magnetic field detector 6 is a square Hall sensor array formed by four rows of Hall sensors, namely a front row, a rear row, an upper row and a lower row;
after the superconducting cable 8 on the paying-off wheel 1 extends out, the superconducting cable firstly bypasses the first guide wheel 4, then sequentially passes through the excitation coil 5 and the center of the magnetic field detector 6, then bypasses the second guide wheel 7 and finally is wound on the take-up wheel 9.
Claims (1)
1. A continuous nondestructive detection device for local defects of a superconducting cable is characterized in that:
a pay-off wheel (1) and a take-up wheel (9) are respectively arranged on the upper left side and the upper right side of the Dewar (3), the shaft of the pay-off wheel (1) is connected with the damper (2), and the shaft of the take-up wheel (9) is connected with a stepping motor;
a guide wheel I (4), an excitation coil (5), a magnetic field detector (6) and a guide wheel II (7) are sequentially arranged in the Dewar (3) from left to right; the magnetic field detector (6) is a square Hall sensor array formed by four rows of Hall sensors, namely a front row, a rear row, an upper row and a lower row;
after the superconducting cable (8) on the paying-off wheel (1) extends out, the superconducting cable firstly bypasses the guide wheel I (4), then sequentially passes through the excitation coil (5) and the center of the magnetic field detector (6), then bypasses the guide wheel II (7), and finally is wound on the take-up wheel (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820303797.6U CN211206346U (en) | 2018-03-06 | 2018-03-06 | Continuous nondestructive testing equipment for local defects of superconducting cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820303797.6U CN211206346U (en) | 2018-03-06 | 2018-03-06 | Continuous nondestructive testing equipment for local defects of superconducting cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211206346U true CN211206346U (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820303797.6U Expired - Fee Related CN211206346U (en) | 2018-03-06 | 2018-03-06 | Continuous nondestructive testing equipment for local defects of superconducting cable |
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| Country | Link |
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| CN (1) | CN211206346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713745A (en) * | 2022-06-08 | 2022-07-08 | 中荣精密金属制品(南通)有限公司 | Spring processing is with sending traditional thread binding putting |
-
2018
- 2018-03-06 CN CN201820303797.6U patent/CN211206346U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713745A (en) * | 2022-06-08 | 2022-07-08 | 中荣精密金属制品(南通)有限公司 | Spring processing is with sending traditional thread binding putting |
| CN114713745B (en) * | 2022-06-08 | 2022-09-02 | 中荣精密金属制品(南通)有限公司 | Spring processing is with sending traditional thread binding putting |
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| CF01 | Termination of patent right due to non-payment of annual fee |