CN115468864A - Device and method for testing bending characteristic of high-temperature superconducting tape - Google Patents
Device and method for testing bending characteristic of high-temperature superconducting tape Download PDFInfo
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- CN115468864A CN115468864A CN202211341608.1A CN202211341608A CN115468864A CN 115468864 A CN115468864 A CN 115468864A CN 202211341608 A CN202211341608 A CN 202211341608A CN 115468864 A CN115468864 A CN 115468864A
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Abstract
The invention discloses a device and a method for testing the bending characteristic of a high-temperature superconducting tape, which relate to the technical field of high-temperature superconduction and comprise the following steps: the bending table is formed by stacking circular steps with diameters sequentially reduced from bottom to top in a concentric axis manner, and the bending table is arranged on the workbench through a sliding plate; the conductive columns are arranged on the workbench, the two sides of the bending table are respectively provided with the conductive columns, the conductive columns are provided with sliding joints which are connected in a sliding manner, and the sliding joints are used for connecting the end parts of the high-temperature superconducting tapes; the sliding plate can slide longitudinally in the direction away from or close to the conductive column; the sliding joint can slide vertically and transversely relative to the conductive column; according to the scheme, when the critical current test under different bending radiuses is completed, through the bending table and the sliding joint, the inconvenience that the sample is repeatedly disassembled and assembled when the high-temperature superconducting tape is tested under different diameters is effectively solved, the test steps are simplified, the test efficiency is effectively improved, and the risk that the sample is damaged and broken due to disassembly and assembly is reduced.
Description
Technical Field
The invention relates to the technical field of high-temperature superconductivity, in particular to a device and a method for testing the bending characteristic of a high-temperature superconducting strip.
Background
Since the advent of high temperature superconducting materials in 1986, high temperature superconducting technology has rapidly developed. In particular, the second generation high temperature superconducting tapes (liquid nitrogen 77K operation) represented by REBCO have been widely used in electric and ferromagnetic devices in the fields of energy, electric power, medical treatment, military industry, etc. due to their excellent current-carrying capacity, high field performance, and mechanical strength. In practical applications, the high-temperature superconducting tape is inevitably bent to prepare a desired cable or magnet, and as a layered ceramic material, it is very susceptible to delamination or fracture damage during bending, thereby reducing or losing current-carrying capacity of the tape, thereby affecting safe operation of the related equipment or device. Therefore, the bending characteristics of the high-temperature superconducting tape are one of important indexes for evaluating the tape properties.
Disclosure of Invention
The invention aims to provide a device and a method for testing the bending characteristic of a high-temperature superconducting strip.
The invention is realized by the following technical scheme:
a bending characteristic testing device for a high-temperature superconducting tape comprises:
the bending table is formed by stacking circular steps with diameters sequentially reduced from bottom to top in a concentric axis manner, and the bending table is arranged on the workbench through a sliding plate;
the conductive columns are arranged on the workbench, the two sides of the bending platform are respectively provided with the conductive columns, the conductive columns are provided with sliding joints in sliding connection, and the sliding joints are used for connecting the end parts of the high-temperature superconducting tape;
the sliding plate can slide longitudinally in the direction away from or close to the conductive columns; the slip joint is slidable vertically and laterally relative to the conductive post.
The critical transition temperatures of practical low-temperature superconducting materials NbTi and Nb3Sn are respectively 9.2k and 18.1k, and the practical low-temperature superconducting materials are usually operated under 4.2k of liquid helium; the critical transition temperature of the first generation high-temperature superconducting Bi is 108k, while the critical temperature of the current second generation high-temperature superconducting (RE system) is 90k, and the current second generation high-temperature superconducting Bi generally operates in a liquid nitrogen temperature zone 77k; compared with the prior art, when the high-temperature superconducting tape is tested for the bending characteristic, the high-temperature superconducting tape is inevitably bent and is very easy to delaminate or break and damage in the bending process, so that the tape is reduced or loses the current carrying capacity, and the safe operation of related equipment or devices is influenced, and the like; when the testing radius needs to be changed, the bending table is longitudinally slid, and the sliding joint is vertically and transversely moved, so that the end part of the sample is prevented from being disassembled; in the above scheme, the longitudinal sliding, and the transverse and vertical sliding are both performed by taking the plane of the workbench, i.e. the upper support plate, as the base surface.
The workbench further comprises an upper supporting plate and a lower supporting plate, the upper supporting plate and the lower supporting plate are connected through a plurality of supporting screws, and the upper supporting plate and the lower supporting plate are parallel to each other; the bending table is arranged on the upper supporting plate through a sliding plate; for realizing the detachable connection of the workbench.
Further preferably, the upper supporting plate and the sliding plate are respectively provided with a sliding groove, the sliding grooves are longitudinally arranged, and screws penetrate through the two sliding grooves; for enabling longitudinal sliding of the bending table.
Preferably, the upper support plate is further fixedly provided with a positioning plate, and the side edge of the positioning plate and the side edge of the sliding plate close to the positioning plate are flush with each other and arranged along the sliding direction of the sliding plate; and the sliding block is prevented from shaking left and right when moving back and forth.
Further preferably, along the height direction of the conductive column, a vertical through groove is formed in the conductive column, and the sliding joint is connected with the vertical through groove through a screw; in order to realize the vertical sliding of the sliding joint, the test of the sample on the circular steps with different diameters is convenient to adjust.
Preferably, the sliding joints comprise bent parts, the bent parts are bent towards the direction of the bending table, and the bent parts of the two sliding joints are arranged oppositely; the length direction of the bending part is the walking direction of the high-temperature superconducting tape; the sliding joint moves transversely and is used for driving the outer side face of one end, pointing to the bending table, of the bending part to be tangent to the circular step with the specified test radius. For enabling the specimen to be greater than or equal to 180 ° around the bending station.
Preferably, the sliding joint further comprises a long straight part connected with the bent part, the long straight part is provided with a transverse through groove, the transverse through groove is arranged along a direction perpendicular to the sliding direction of the sliding plate, and a screw on the vertical through groove penetrates through the transverse through groove; a horizontal logical groove for realizing sliding joint.
Preferably, the bent part is bent by 90 degrees relative to the long straight part, the long straight part is provided with a plurality of threaded holes, and copper pressing sheets are screwed on the threaded holes and used for pressing the end part of the high-temperature superconducting strip on the long straight part; the device is used for avoiding the interference of a sample joint part caused by a fixing screw and the like.
Further preferably, the conductive column and the sliding joint are both made of red copper; the test accuracy can be improved by adopting the red copper with good conductivity to prepare the copper alloy.
Preferably, the conductive column sequentially penetrates through the upper supporting plate and the lower supporting plate, the conductive column between the upper supporting plate and the lower supporting plate is provided with a supporting plate extending outwards, and a conductive joint is fixed between the two supporting plates; for enabling power-on.
Further optimized, the testing method of the device for testing the bending property of the high-temperature superconducting tape comprises the following steps:
the method comprises the following steps: winding the high-temperature superconducting tape around the circular step with the largest diameter of the bending table, and respectively connecting two ends of the high-temperature superconducting tape to the two sliding joints; then adjusting the positions of the bending table and the sliding joint to ensure that the high-temperature superconducting tape is just tightened, and the bent part winds around the bending table for more than or equal to 180 degrees;
step two: welding a voltage lead and simultaneously connecting a power line with the conductive sliding joint on the conductive column;
step three: placing the assembled testing device in a liquid nitrogen environment to be cooled to a superconducting state, then connecting a voltage lead signal output end to a nano-volt meter, and switching on a power supply to start an experiment;
step four: after the maximum bending diameter is tested, the power supply is turned off, the testing device is taken out, the bending table and the sliding joint are adjusted again, the high-temperature superconducting tape is adjusted to the position with the second largest bending diameter, the state of the high-temperature superconducting tape is ensured to be as shown in the step one, and the step 3 is repeated after the test is finished;
step five: and repeating the step four, and sequentially testing the high-temperature superconducting tapes on the circular steps of the bending table according to the sequence of the bending diameters from large to small until the test of the minimum diameter is completed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention provides a device and a method for testing the bending property of a high-temperature superconducting strip, wherein the testing device adopts a slidable bending table and a slidable joint, and two ends of a sample are fixed with the slidable joint and then detached until the experiment is finished, so that the inconvenience of repeated detachment and installation of the sample when the high-temperature superconducting strip is tested under different diameters is effectively solved, the testing steps are simplified, the testing efficiency is effectively improved, and the sample damage risk caused by detachment and installation is reduced;
2. the invention provides a device and a method for testing the bending characteristic of a high-temperature superconducting tape.
3. The invention provides a device and a method for testing the bending property of a high-temperature superconducting strip.
4. The invention provides a device and a method for testing the bending property of a high-temperature superconducting tape.A sliding joint is provided with a 90-degree bending part with a certain radius, and the tape is tightly attached to the bending part and fixed on a long straight part, so that the joint part can not generate interference due to fixing screws and the like to influence the test result when a small bending diameter is tested.
5. The invention provides a device and a method for testing the bending property of a high-temperature superconducting tape, which can meet the bending property test of the high-temperature superconducting tapes with all bandwidths on the market at present.
6. The invention provides a device and a method for testing the bending characteristic of a high-temperature superconducting tape.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a graph of experimental data for one embodiment of the invention.
Reference numbers and corresponding part names in the drawings:
1-lower supporting plate, 2-upper supporting plate, 3-supporting screw rod, 4-positioning plate, 5-sliding plate, 6-bending table, 7-left conductive column, 8-right conductive column, 9-left sliding joint and 10-right sliding joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the present embodiment 1 provides a device for testing bending characteristics of a high temperature superconducting tape, comprising:
the bending table 6 is formed by stacking circular steps with diameters sequentially reduced from bottom to top in a concentric axis manner, and the bending table 6 is arranged on the workbench through a sliding plate 5;
the conductive columns are arranged on the workbench, the two sides of the bending platform 6 are respectively provided with the conductive columns, the conductive columns are provided with sliding joints in sliding connection, and the sliding joints are used for connecting the end parts of the high-temperature superconducting tapes;
the sliding joints comprise bent parts which are bent towards the bending table 6, and the bent parts of the two sliding joints are arranged oppositely; the length direction of the bending part is the walking direction of the high-temperature superconducting tape;
the sliding plate 5 can slide longitudinally in the direction away from or close to the conductive column; the slip joint is slidable vertically and laterally relative to the conductive post; the sliding joint moves transversely and is used for driving the outer side face of one end, pointing to the bending table 6, of the bending part to be tangent to the circular step with the specified test radius.
Compared with the prior art, when the high-temperature superconducting tape is tested for the bending characteristic, the high-temperature superconducting tape is inevitably bent, and is very easy to delaminate or break and damage in the bending process, so that the tape is reduced or loses the current carrying capacity, and the safe operation of related equipment or devices is influenced, and the like, the scheme provides the high-temperature superconducting tape bending characteristic testing device, by adopting the scheme, after the two ends of the high-temperature superconducting tape and the sliding connector are fixed through the slidable bending table 6 and the sliding connector, the high-temperature superconducting tape is dismounted until the experiment is finished, so that the damage risk of the high-temperature superconducting tape in the repeated dismounting process is avoided, in the specific scheme, the bending table 6 is included, the high-temperature superconducting tape can be tested for the bending characteristic by winding round steps with different diameters on the bending table 6, the bending table 6 is fixedly located on the working table, the conductive columns, namely the left conductive column 7 and the right conductive column 8, the sliding connectors, namely the left sliding connector 9 and the right sliding connector 10, are arranged on the conductive columns, and in the specific experiment process, the high-temperature superconducting tape bypasses the round steps with the specified radius of the bending table 6, and the two ends of the high-temperature superconducting tape are respectively connected to the two sliding guide columns, and then are electrified for the bending characteristic testing; and when the test radius needs to be changed, the bending table 6 is longitudinally slid, and the sliding joint is vertically and transversely moved, so that the end part of the test sample is prevented from being disassembled.
Referring to fig. 1, as a specific embodiment for realizing detachable connection of a workbench, the workbench includes an upper supporting plate 2 and a lower supporting plate 1, the upper supporting plate 2 and the lower supporting plate 1 are connected by a plurality of supporting screws 3, and the upper supporting plate 2 and the lower supporting plate 1 are parallel to each other; the bending table 6 is arranged on the upper supporting plate 2 through a sliding plate 5; in this scheme, the workstation includes backup pad 2 and bottom suspension fagging 1, goes up backup pad 2 and bottom suspension fagging 1 and is parallel to each other, all is connected with supporting screw 3 in the four corners position to through 3 fixed bottom suspension faggings of supporting screw.
In a further scheme, sliding grooves are formed in the upper supporting plate 2 and the sliding plate 5, the sliding grooves are longitudinally arranged, and screws penetrate through the two sliding grooves; in order to realize the longitudinal sliding of the bending table 6, in the present embodiment, the upper support plate 2 and the sliding plate 5 are both provided with sliding grooves, preferably, the sliding plates 5 on both sides of the bending table 6 are both provided with sliding grooves, at this time, the screws vertically penetrate through the sliding grooves, and the front-back movement and the fixing of the bending table 6 can be realized by adjusting the tightness of the screws.
As a specific implementation mode for preventing the sliding block from shaking left and right when moving back and forth, the upper support plate 2 is further fixedly provided with a positioning plate 4, and the side edge of the positioning plate 4 and the side edge of the sliding plate 5 close to the positioning plate 4 are flush with each other and arranged along the sliding direction of the sliding plate 5; in this scheme, still be provided with locating plate 4 on last backup pad 2, locating plate 4 sets up in slip one side, and the adjacent terminal surface of two boards is parallel to each other, at specific experimentation, hugs closely sliding plate 5 on locating plate 4, can make the stable edge longitudinal slip of sliding plate 5.
In this embodiment, a vertical through groove is formed in the conductive column along the height direction of the conductive column, and the sliding joint is connected with the vertical through groove through a screw; in order to realize the vertical sliding of the sliding joint and facilitate the test of an adjusting sample on circular steps with different diameters, in the scheme, the vertical through groove is formed in the conductive column, the sliding joint is connected to the vertical through groove through a screw, and the adjustment of the sliding joint in the vertical direction can be realized through the tightness of the screw; wherein, vertical logical groove is preferred two, the stability of being convenient for adjust.
With continued reference to fig. 1, the sliding joint comprises a bending portion, which is bent towards the bending station 6, and the bending portions of the two sliding joints are arranged opposite to each other; the length direction of the bending part is the walking direction of the high-temperature superconducting tape; the sliding joint moves transversely and is used for driving the outer side face of one end, pointing to the bending table 6, of the bending part to be tangent to the circular step with the specified test radius. The sliding joints comprise bending parts, the bending parts are bent towards the bending table 6, the two sliding joints are symmetrically arranged along the central axis of the bending table 6, the bending parts are located between the two sliding joints, in the specific experiment process, the bending parts can receive the end parts of a sample, the end parts of the sample can cling to the outer side surfaces of the bending parts, walk along the length path direction of the bending parts, and are finally connected to the other ends of the sliding joints; the outer side face of one end of the bending part, which points to the bending table 6, needs to be tangent to the circular step with the appointed testing radius, so that the test effect can be achieved only when the sample winds the bending table for more than or equal to 180 degrees, and the adjustment can be achieved through the transverse movement of the sliding joint.
As a specific embodiment of the transverse through groove for realizing the sliding joint, the sliding joint further comprises an elongated straight portion connected with the curved portion, the elongated straight portion is provided with a transverse through groove, the transverse through groove is arranged along a direction perpendicular to a sliding direction of the sliding plate 5, and a screw on the vertical through groove penetrates through the transverse through groove; in this scheme, sliding joint still includes long straight portion, and long straight partial length direction is for following sliding joint lateral shifting direction, and it has the horizontal logical groove that sets up along its length direction to open on long straight portion, and the screw passes horizontal logical groove and vertical logical groove in proper order this moment, through the elasticity of screw, can realize sliding joint's horizontal and longitudinal movement.
As a specific embodiment of a more stable experimental test, the bending part is bent at 90 ° relative to the long straight part, the long straight part is provided with a plurality of threaded holes, and the threaded holes are screwed with copper pressing sheets for pressing the end of the high-temperature superconducting strip on the long straight part; in order to avoid the interference of the joint part of the sample caused by the fixing screws and the like, in the scheme, the bending part is bent by 90 degrees with a certain radius relative to the long straight part, namely the bending arc length is a quarter circle, so that the end part of the sample can be fixed in the long straight part along the bending part, and the outer side surface of the bending part, which points to one end of the bending table 6, is tangent to the circular step with the specified test radius all the time, so that the sample can be always attached to the bending part, and the attachment part is the quarter circle arc length, thereby realizing that the joint part cannot generate the interference caused by the fixing screws and the like even in the test of a small bending diameter, and further influencing the experimental effect.
In a further scheme, the conductive column and the sliding joint are both made of red copper with good conductivity, so that the testing accuracy can be improved.
In a further scheme, the upper and lower supporting plates, the positioning plate 4, the sliding plate 5 and the bending table 6 are all formed by processing epoxy resin plates, and are beneficial to being insulated from the conductive columns.
With reference to fig. 1, in order to implement the energization, in this embodiment, the conductive pillar sequentially penetrates through the upper supporting plate 2 and the lower supporting plate 1, the conductive pillar between the upper supporting plate 2 and the lower supporting plate 1 is provided with a supporting plate extending outward, and a conductive joint is fixed between the two supporting plates; the conductive column sequentially penetrates through the through grooves in the upper supporting plate 2 and the lower supporting plate 1, the supporting plate extending outwards is arranged on the conductive column between the two supporting plates, and the conductive joint is fixed on the two supporting plates, so that compared with a conventional method of directly connecting with the joint, the power line is prevented from moving or being detached and installed along with the change of the test diameter during testing, and the testing efficiency and the risk of sample damage are further improved.
Example 2
The embodiment 2 is further optimized on the basis of the embodiment 1, and provides a testing method of a device for testing the bending property of the high-temperature superconducting tape, which comprises the following steps:
step 1: taking a REBCO high-temperature superconducting tape sample with a proper length, firstly bypassing the circular step with the largest diameter of the bending table 6, connecting the sample with the end part of the bending table through a sliding joint, just tensioning the sample by adjusting the positions of the sliding joint and the bending table 6, ensuring that the bent part is more than or equal to 180 degrees around the bending table 6, and adjusting the upper surface of one end of the sliding joint, which points to the bending table 6, to be tangent to the circular step with the specified test diameter.
And 2, step: and welding voltage leads at proper positions away from the two ends of the sample, ensuring the leads to be fixed firmly, and connecting the power line with the conductive joint of the conductive column.
And 3, step 3: and putting the assembled sample and device into a liquid nitrogen Dewar tank, cooling the sample and device to a superconducting state by using liquid nitrogen, connecting a voltage lead signal output end to a nano-volt meter, and switching on a power supply to start a test.
And 4, step 4: and (3) after the maximum bending diameter is tested, turning off the power supply to integrally take out the sample and the device, adjusting the position of the sample to the position with the second largest bending diameter by adjusting the positions of the sliding joint and the bending table 6, ensuring the state of the sample as described in the step 1, and repeating the step 3 after the test is finished.
And 5: in the subsequent test, the high-temperature superconducting tapes are sequentially tested on the circular steps of the bending table according to the sequence of the bending diameters from large to small, and the step 4 is repeated until the minimum diameter test is completed, and the sample is disassembled and the experimental device is structured.
According to the bending test method for the high-temperature superconducting tape, the device and the four-lead method in the technical scheme are used for completing the critical current test under different bending radii according to the steps, so that the bending characteristics of different tapes are evaluated, and important references are provided for design and manufacture of cables and magnets.
Example 3
As shown in fig. 2, this example 3 performs an experiment based on example 2, and provides specific experimental data. By adopting the patent and the test method, suzhou new material and Shanghai superconducting high-temperature superconducting tape are respectively selected for testing. The width of each strip is 2mm, the length of each strip is 33cm, the distance between voltage leads is 10cm, the distance between two ends of each strip and the lead is 11.5cm, the test temperature is 77K of liquid nitrogen, the superconducting layer is close to the outer side of a bend during the test, and the change curve of the obtained normalized critical current along with the bend radius is shown in figure 2.
The above embodiment shows that the bending critical characteristic test of the high-temperature superconducting tape by using the patent and the test method of the invention shows that the critical bending diameters of the high-temperature superconducting tape provided by Suzhou new material and Shanghai superconducting are respectively less than 8mm and less than 6mm, which are consistent with the test results provided by the patent and the test method, and a good curve of normalized critical current changing along with the bending diameter is obtained, which indicates that the patent and the test method of the invention have better practicability and can be popularized.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A bending characteristic testing device for a high-temperature superconducting tape is characterized by comprising:
the bending table (6) is formed by stacking concentric axes of circular steps with diameters sequentially reduced from bottom to top, and the bending table (6) is arranged on the workbench through a sliding plate (5);
the conductive columns are arranged on the workbench, two sides of the bending platform (6) are respectively provided with the conductive columns, sliding joints in sliding connection are arranged on the conductive columns, and the sliding joints are used for connecting the end parts of the high-temperature superconducting tapes;
the sliding plate (5) can slide longitudinally towards the direction far away from or close to the conductive column; the slip joint is slidable vertically and laterally relative to the conductive post.
2. The bending property testing device of the high-temperature superconducting tape as claimed in claim 1, wherein the working table comprises an upper supporting plate (2) and a lower supporting plate (1), the upper supporting plate (2) and the lower supporting plate (1) are connected through a plurality of supporting screws (3), and the upper supporting plate (2) and the lower supporting plate (1) are parallel to each other; the bending table (6) is arranged on the upper supporting plate (2) through a sliding plate (5).
3. A high temperature superconducting tape bending property testing device according to claim 2, wherein the upper support plate (2) and the sliding plate (5) are provided with sliding grooves, the sliding grooves are longitudinally arranged, and screws are arranged on the two sliding grooves in a penetrating manner.
4. The bending property testing device of a high temperature superconducting tape as claimed in claim 2, wherein a positioning plate (4) is further fixed on the upper supporting plate (2), and the side edge of the positioning plate (4) and the side edge of the sliding plate (5) close to the positioning plate are flush with each other and arranged along the sliding direction of the sliding plate (5).
5. The device for testing the bending property of the high-temperature superconducting tape as claimed in claim 1, wherein a vertical through groove is formed in the conductive column along the height direction of the conductive column, and the sliding joint is connected with the vertical through groove through a screw.
6. A device for testing the bending properties of a high temperature superconducting tape as claimed in claim 5, wherein the slip joints comprise bending portions which are bent in the direction of a bending table (6), the bending portions of the two slip joints being arranged opposite to each other; the length direction of the bending part is the walking direction of the high-temperature superconducting tape; the sliding joint moves transversely and is used for driving the outer side face of one end, pointing to the bending table (6), of the bending part to be tangent to the circular step with the designated test radius.
7. A high temperature superconducting tape bending property testing device according to claim 6, wherein the sliding joint further comprises an elongated straight portion connected with the bending portion, the elongated straight portion is provided with a transverse through groove, the transverse through groove is arranged along a sliding direction perpendicular to the sliding plate (5), and the screw on the vertical through groove penetrates through the transverse through groove.
8. The apparatus as claimed in claim 7, wherein the curved portion is bent at 90 ° with respect to the long straight portion, the long straight portion has a plurality of threaded holes, and the threaded holes are screwed with copper pressing pieces for pressing the end of the high temperature superconducting tape against the long straight portion.
9. The bending property testing device of a high temperature superconducting tape as claimed in claim 2, wherein the conductive column sequentially penetrates through the upper supporting plate (2) and the lower supporting plate (1), an outwardly extending supporting plate is provided on the conductive column between the upper supporting plate (2) and the lower supporting plate (1), and a conductive joint is fixedly arranged between the two supporting plates.
10. The method for testing the bending property of the high-temperature superconducting tape according to any one of claims 1 to 9, wherein the method comprises the steps of:
the method comprises the following steps: the high-temperature superconducting tape bypasses the circular step with the largest diameter of the bending table (6), and the two ends of the high-temperature superconducting tape are respectively connected to the two sliding joints; then adjusting the positions of the bending table (6) and the sliding joint to ensure that the high-temperature superconducting tape is just tightened, and the bent part winds the bending table (6) for more than or equal to 180 degrees;
step two: welding a voltage lead and simultaneously connecting the power line with the conductive sliding joint on the conductive column;
step three: placing the assembled test device in a liquid nitrogen environment to be cooled to a superconducting state, then connecting the output end of a voltage lead to a nano-volt meter, and switching on a power supply to start an experiment;
step four: after the maximum bending diameter is tested, the power supply is turned off, the testing device is taken out, the bending table (6) and the sliding joint are adjusted again, the high-temperature superconducting tape is adjusted to the position with the second largest bending diameter, the state of the high-temperature superconducting tape is ensured to be as shown in the step one, and the step 3 is repeated after the test is finished;
step five: and repeating the step four, and sequentially testing the high-temperature superconducting tapes on the circular steps of the bending table (6) according to the sequence of the bending diameters from large to small until the minimum diameter test is completed.
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Citations (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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