CN110261694B - Variable bending critical performance test sample rod for superconducting stranded wire - Google Patents
Variable bending critical performance test sample rod for superconducting stranded wire Download PDFInfo
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- CN110261694B CN110261694B CN201910414724.3A CN201910414724A CN110261694B CN 110261694 B CN110261694 B CN 110261694B CN 201910414724 A CN201910414724 A CN 201910414724A CN 110261694 B CN110261694 B CN 110261694B
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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
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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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
- G01N2203/0023—Bending
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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
- G01N2203/022—Environment of the test
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Abstract
The invention discloses a superconducting strand variable bending critical performance test sample rod, which comprises a variable bending test module, a bakelite support ring, an epoxy sleeve, a signal wire jack, an upper drive rod, two current leads and a stainless steel flange, wherein one end of the epoxy sleeve is provided with the stainless steel flange, the other end of the epoxy sleeve is provided with the bakelite support ring, the signal wire jack is fixed on the stainless steel flange, the lower ends of the current leads and the lower end of the upper drive rod penetrate through the bakelite support ring, the upper ends of the current leads and the upper end of the upper drive rod extend out of the epoxy sleeve, the lower ends of the current leads are connected with a copper strip of the bending test module, the upper drive rod is connected with a lower drive rod in the bending test module, and the bending test module is connected with the epoxy sleeve through a hanger rod. The variable bending structure is novel in design, can realize the critical performance test of the superconducting strand under different bending radii, and is easy to operate when a sample is replaced.
Description
Technical Field
The invention relates to the field of testing of critical performance of superconducting strands, in particular to a sample rod for testing variable bending critical performance of superconducting strands.
Background
One of the dream energy of human beings in the fusion energy, the full-superconducting Tokamak magnetic confinement fusion device is a reliable device for realizing fusion energy power generation, and the superconducting magnet is the key of a full-superconducting controllable nuclear fusion reactor. The superconducting cable is an important component of the superconducting magnet, and the technology of the superconducting cable is one of the key technologies for designing the superconducting magnet. A superconducting cable is formed by stranding a plurality of superconducting strands, and thus research into superconducting wires is an important work therein.
At present, two low-temperature superconducting materials, Nb3Sn and NbTi, are already mature and applied to fusion device magnets and are also widely applied to large-scale accelerator superconducting magnets and superconducting nuclear magnetic resonance magnets. New high temperature superconducting materials are also in the process of being gradually developed.
In a stranded superconducting cable and in the operation of the cable, the superconducting strand can generate bending strain in different states, the excessive strain quantity can affect the superconducting performance of the strand, the bending deformation is increased along with the increase of the electromagnetic force of the superconducting magnet, the bending deformation of the superconducting strand needs to be avoided in the design, production and magnet design processes of the superconducting cable, and the critical performance of the superconducting strand along with the bending deformation is the basis of the design and manufacture of the superconducting cable. Therefore, critical performance under bending strain of the superconducting strands needs to be tested.
Therefore, a set of sample rods for testing the critical performance of the superconducting strands under bending deformation is designed, the sample rods can be used for testing the bending critical performance of the superconducting round strands such as Nb3Sn, NbTi, MgB2 and Bi2212, and the device can realize the critical performance test under different bending radii.
In the experiment for testing the variable bending critical performance of the superconducting strand, a standard four-lead method is adopted for measurement.
In the experiment for testing the variable bending critical performance of the superconducting strand, the potential line distance of a test sample is 50 mm.
The experimental contents mainly include: and testing critical current and n value under different bending radii and different magnetic fields, liquid helium temperature or liquid nitrogen temperature.
A test sample is soaked in liquid helium or liquid nitrogen for an electrification experiment, bending stress needs to be applied to the test sample in the test process, a set of reliable test device needs to be designed, the test sample is fixed and different bending stresses are applied, direct current is introduced to the sample in a background magnetic field, and the critical current and the n value of the sample are tested.
At present, various superconducting strand bending critical performance testing devices are designed in various international superconducting laboratories, the structures of the superconducting strand bending critical performance testing devices are different, and in order to be capable of safely, accurately, reliably and efficiently measuring the bending critical performance of a superconducting strand, the following points must be considered during the design of a sample rod:
1. the test sample can be stably fixed on the test device;
2. under the low-temperature environment, the contact between the test sample and the current lead is good, and the current transmission is stable;
3. the bending stress loading is reliable;
4. the test sample is easy to replace;
5. the sample rod current lead is easy to cool to save low-temperature cooling liquid;
6. the sample rod should be well electrically insulated from the outside during the electrification experiment.
Disclosure of Invention
The invention aims to fill the technical blank in the field in China at present and provides a superconducting strand variable bending strain critical performance test sample rod.
In order to achieve the purpose, the invention adopts the technical scheme that:
a superconducting wire variable bending critical performance test sample rod is characterized in that: the device comprises a variable bending test module, a bakelite support ring, an epoxy sleeve, a signal wire jack, an upper transmission rod, two current leads and a stainless steel flange;
the variable bending test module comprises a suspender, a lower transmission rod, a framework clamping block, an upper base, a pressing block, a worm, a lower base, a turbine, a rotating arm, a sample framework, a wire outlet terminal and a copper strip;
one end of the epoxy sleeve is provided with a stainless steel flange, the other end of the epoxy sleeve is provided with a bakelite support ring, a signal wire jack is fixed on the stainless steel flange, the lower end of a current lead and the lower end of an upper transmission rod penetrate through the bakelite support ring, the upper end of the current lead and the upper end of the upper transmission rod extend out of the epoxy sleeve, the lower end of the current lead is connected with a copper strip of the bendable test module, the upper transmission rod is connected with a lower transmission rod in the bendable test module, and the bendable test module is connected with the epoxy sleeve through a suspender;
the turbine, the worm and the pressing block are fixed on the lower base, the upper base is fixed on the pressing block, the turbine penetrates through the upper base and is connected with the rotating arm, the sample framework is connected with the rotating arm through the framework clamping block, the wire outgoing terminal is fixed on the framework clamping block and is connected with a current lead through a copper strip, the lower transmission rod penetrates through the upper base and is connected with the worm in a transmission mode, the turbine is connected with the worm in a matching mode, and the hanging rod hoists the whole bending test module.
The superconducting wire variable bending critical performance test sample rod is characterized in that: the upper end of the upper transmission rod is connected with a precise motor.
The superconducting wire variable bending critical performance test sample rod is characterized in that: the sample framework is made of a Ti-6Al-4V material.
The superconducting wire variable bending critical performance test sample rod is characterized in that: the middle of the sample skeleton is provided with a groove for placing a superconducting strand sample, two ends of the sample skeleton are of a fillet structure, and two ends of the superconducting strand sample are led out to wire outlet terminals from the positions of fillets at two ends of the sample skeleton.
The superconducting wire variable bending critical performance test sample rod is characterized in that: the current lead is made of high-purity copper and adopts a hollow cylindrical structure.
The invention has the beneficial effects that:
the invention plays a great role in the critical performance test under the bending strain of the superconducting strand, the bending module can realize the critical performance test under different bending radiuses, the sample framework is convenient to disassemble, and the operation is simple and easy when the sample is replaced; the worm and gear between the upper base and the lower base are both in detachable design, so that the replacement is convenient; the epoxy sleeve structure is easy to dry, the sample replacement time is shortened, and the phenomenon that condensed water on the surface of the sample rod is frozen after being placed into the liquid helium dewar is avoided.
The invention has the advantages that:
the invention is suitable for testing the critical performance of the superconducting strand under different bending radii, the bending module has novel structural design, no similar structure exists in China at present, and the operation is simple and easy when the sample is replaced.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
FIG. 2 is a schematic structural diagram of a bending module according to the present invention.
FIG. 3 is a schematic view of a sample skeleton of a bending module according to the present invention.
Figure 4 is a top view of the lower base of the bending module according to the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, a superconducting wire variable bending critical performance test sample rod is characterized in that: the device comprises a variable bending test module A1, a bakelite support ring A2, an epoxy sleeve A3, a signal wire jack A4, an upper transmission rod A5, two current leads A6 and a stainless steel flange A7;
the variable bending test module comprises a hanging rod B1, a lower transmission rod B2, a framework clamping block B3, an upper base B4, a pressing block B5, a worm B6, a lower base B7, a turbine B8, a rotating arm B9, a sample framework B10, an outlet terminal B11 and a copper strip B12;
one end of the epoxy sleeve A3 is provided with a stainless steel flange A7, the other end of the epoxy sleeve A3 is provided with a bakelite support ring A2, a signal wire jack A4 is fixed on the stainless steel flange A7, the lower end of a current lead A6 and the lower end of an upper transmission rod A5 penetrate through the bakelite support ring A2, the upper end of the current lead A6 and the upper end of an upper transmission rod A5 extend out of the epoxy sleeve A3, the lower end of the current lead A6 is connected with a copper strip B12 of the bendable test module A1, the upper transmission rod A6 is connected with a lower transmission rod B2 in the bending test module A1, and the bending test module A1 is connected with the epoxy sleeve A3 through a suspender B1;
the device comprises a turbine B8, a worm B6 and a pressure block B5, wherein the turbine B8, the worm B6 and the pressure block B5 are fixed on a lower base B7, the upper base B4 is fixed on a pressure block B5, the turbine B8 penetrates through the upper base B4 and is connected with a rotating arm B9, a sample framework B10 is connected with a rotating arm B9 through a framework clamping block B3, an outgoing line terminal B11 is fixed on a framework clamping block B3, the outgoing line terminal B11 is connected with a current lead A6 through a copper strip B12, a lower driving rod B2 penetrates through an upper base B4 and is in transmission connection with a worm B6, the turbine B8 is in matched connection with the worm B6, and the suspension rod B1 hoists the whole bending test module A1.
The upper end of the upper transmission rod A5 is connected with a precision motor, the lower end of the upper transmission rod A5 is connected with the lower transmission rod B2, the upper transmission rod A6 and the lower transmission rod B2 are used for driving the worm B6 and the turbine B8 to rotate in the experimental process, the turbine B8 and the worm B6 rotate along with the rotation of the rotating arm B9, the framework clamping block B3 is used for connecting the rotating arm B9 with the sample framework B10, and the sample framework B10 rotates along with the rotation of the upper transmission rod A6, so that samples are bent to different radiuses; the sample framework B10 is made of Ti-6Al-4V, so that the influence of different thermal expansion coefficients on a test result is reduced, a groove is formed in the middle of the sample framework B10, and two ends of the sample framework B10 are in a fillet structure; as shown in fig. 3, in the experiment, a superconducting strand sample is placed in a groove, and two ends of the sample are led out from the positions of the fillets at two ends of a sample skeleton B10 to an outlet terminal B11; the current lead A6 is made of high-purity copper and is used for connecting an external power supply to provide a power supply for an experimental sample, and the current lead A6 adopts a hollow cylindrical structure to reduce heat leakage; the pressing block B5 is used for supporting the worm B6 and fixedly connecting the lower base B7 and the upper base B4 together.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. A superconducting wire variable bending critical performance test sample rod is characterized in that: the device comprises a variable bending test module, a bakelite support ring, an epoxy sleeve, a signal wire jack, an upper transmission rod, two current leads and a stainless steel flange; the variable bending test module comprises a suspender, a lower transmission rod, a framework clamping block, an upper base, a pressing block, a worm, a lower base, a turbine, a rotating arm, a sample framework, a wire outlet terminal and a copper strip; one end of the epoxy sleeve is provided with a stainless steel flange, the other end of the epoxy sleeve is provided with a bakelite support ring, a signal wire jack is fixed on the stainless steel flange, the lower end of a current lead and the lower end of an upper transmission rod penetrate through the bakelite support ring, the upper end of the current lead and the upper end of the upper transmission rod extend out of the epoxy sleeve, the lower end of the current lead is connected with a copper strip of the bendable test module, the upper transmission rod is connected with a lower transmission rod in the bendable test module, and the bendable test module is connected with the epoxy sleeve through a suspender; the device comprises a lower base, a worm, a pressing block, a worm wheel, a worm and a sample framework, wherein the worm wheel, the worm and the pressing block are fixed on the lower base, the upper base is fixed on the pressing block, the worm wheel penetrates through the upper base and is connected with a rotating arm, the sample framework is connected with the rotating arm through a framework clamping block, a wire outgoing terminal is fixed on the framework clamping block and is connected with a current lead through a copper strip, a lower transmission rod penetrates through the upper base and is in transmission connection with the worm, the worm wheel is in fit connection with the worm, and a hanging rod hoists the whole bending test module;
the sample framework is made of a Ti-6Al-4V material;
the superconducting strand sample processing device is characterized in that a groove for placing a superconducting strand sample is formed in the middle of the sample skeleton, the two ends of the sample skeleton are of a fillet structure, and the two ends of the superconducting strand sample are led out to wire outlet terminals from the fillet positions at the two ends of the sample skeleton.
2. The superconducting wire variable bending critical performance test sample rod according to claim 1, wherein: the upper end of the upper transmission rod is connected with a precise motor.
3. The superconducting wire variable bending critical performance test sample rod according to claim 1, wherein: the current lead is made of high-purity copper and adopts a hollow cylindrical structure.
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| CN112542269B (en) * | 2020-11-30 | 2022-07-12 | 中国科学院合肥物质科学研究院 | Preparation method of tensile strain critical current test sample of niobium-tin superconducting wire |
| CN114167182B (en) * | 2021-12-06 | 2023-08-18 | 中国科学院合肥物质科学研究院 | Device for testing cyclic bending and current-carrying characteristics of liquid helium temperature zone of superconducting strip |
| CN114994448B (en) * | 2022-07-12 | 2024-06-04 | 核工业西南物理研究院 | High-temperature superconducting strand bending performance continuous testing device |
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| CN108106935A (en) * | 2017-11-24 | 2018-06-01 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of superconducting line axial strain |
| CN108398337A (en) * | 2018-03-12 | 2018-08-14 | 中国科学院合肥物质科学研究院 | A kind of critical performance testing device of Superconducting Strand partial lateral compression strain |
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Patent Citations (6)
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| CN201796076U (en) * | 2010-03-10 | 2011-04-13 | 中国科学院等离子体物理研究所 | Superconductive strand critical current test sample holder |
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