CN115406751B - Welding type conduction experiment fixture for high-temperature superconducting cable and method thereof - Google Patents
Welding type conduction experiment fixture for high-temperature superconducting cable and method thereof Download PDFInfo
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- CN115406751B CN115406751B CN202211341607.7A CN202211341607A CN115406751B CN 115406751 B CN115406751 B CN 115406751B CN 202211341607 A CN202211341607 A CN 202211341607A CN 115406751 B CN115406751 B CN 115406751B
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a welding type conduction experiment clamp for a high-temperature superconducting cable and a method thereof, wherein the welding type conduction experiment clamp comprises an upper part and a lower part; the upper and lower parts each comprise: and an electrifying module: the electrified module is provided with a first through hole connected with the insulating pull rod of the stretcher and a second through hole connected with an electrified cable; welding the module: the welding module comprises a welding plate, the welding plate is fixed on the electrifying module, a first groove is formed in the middle of the welding plate along the length direction of the welding plate, an arc-shaped soldering tin groove is formed in the middle of the first groove along the length direction of the welding plate, a third through hole communicated with the arc-shaped soldering tin groove is formed in one end of the welding plate, and a high-temperature superconducting cable sample is inserted into the arc-shaped soldering tin groove through the third through hole; and the arc-shaped soldering tin grooves are filled with solder. This scheme of adoption makes sample both ends adopt the welding form centre gripping, can avoid the tip damage that conventional mechanical clamping caused.
Description
Technical Field
The invention relates to the technical field of high-temperature superconducting performance testing, in particular to a welding type conducting experiment clamp for a high-temperature superconducting cable and a method thereof.
Background
Compared with conventional copper cables, low-temperature superconducting NbTi and Nb3Sn cables, the high-temperature superconducting cable has higher current-carrying capacity and high field performance, and can provide a magnetic field of more than 20T to meet the requirements of future nuclear fusion and large-scale high-intensity magnetic field devices on high fields. However, the high-temperature superconducting cable is inevitably subjected to tensile, torsional, bending and transverse compression loads in the process of winding the multi-stage cable and preparing the magnet, and meanwhile, the high-temperature superconducting cable is subjected to huge electromagnetic force and other mechanical disturbance loads in the operation process of the device, and the loads degrade or damage the mechanical performance of the high-temperature superconducting cable and seriously threaten the safety and stability of the device. Therefore, when a high-performance high-temperature superconducting cable is developed, mechanical performance parameters of the high-performance high-temperature superconducting cable are tested and evaluated, particularly the mechanical performance under stretching and twisting conditions, and the method has great reference value for stranding of a multi-stage cable and preparation of a magnet.
However, the tensile and torsional mechanical property test fixture of the conventional material has higher requirements on the structure and the shape of a test sample, and cannot simultaneously meet the clamping and electrifying of the high-temperature superconducting cable at low temperature; meanwhile, the conventional clamp is easy to slip or fall off due to different thermal contraction coefficients with a high-temperature superconducting cable material under the extremely low temperature condition of the superconducting cable operation; in addition, the standard clamp equipped with the current stretching device can cause certain mechanical damage to the cable clamping part, and is easy to cause test difficulty or result inaccuracy. The current common clamping mode in the literature data is to clamp two ends of a high-temperature superconducting cable by adopting a jaw of a conventional clamp of a stretcher, and then a conductive copper joint is installed at a certain distance from the two clamped ends to realize a test function. Other clamping modes in the prior art are complex and inconvenient to operate, and the test efficiency is seriously influenced.
Disclosure of Invention
The invention aims to provide a welding type conduction experiment fixture for a high-temperature superconducting cable and a method thereof.
The invention is realized by the following technical scheme:
a welding type conduction experiment clamp for a high-temperature superconducting cable comprises an upper part and a lower part;
the upper and lower parts each include:
and an electrifying module: the electrified module is provided with a first through hole connected with the insulating pull rod of the stretcher and a second through hole connected with an electrified cable;
welding the module: the welding module comprises a welding plate, the welding plate is fixed on the electrifying module, the middle part of the welding plate is provided with a first groove along the length direction of the welding plate, the middle part of the first groove is also provided with an arc-shaped soldering tin groove arranged along the length direction of the welding plate, one end of the welding plate is provided with a third through hole communicated with the arc-shaped soldering tin groove, and the welding plate is used for penetrating a high-temperature superconducting cable sample into the arc-shaped soldering tin groove through the third through hole; and the arc-shaped soldering tin grooves are filled with solder.
Compared with the prior art, the welding type conductive experiment clamp for the high-temperature superconducting cable is used for testing mechanical performance parameters such as stretching and twisting pitch of the high-temperature superconducting cable at low temperature, and therefore reliable experiment bases are provided for design and manufacture of the high-temperature superconducting multistage cable and the magnet. The high-temperature superconducting cable test device comprises an upper part and a lower part, wherein the upper part and the lower part are respectively arranged at two ends of a high-temperature superconducting cable test sample and are arranged in an up-and-down symmetrical mode, the structures and the connection modes of the upper part and the lower part are the same, the structures of the upper part and the lower part respectively comprise a power-on module and a welding module, the upper end part of the power-on module is provided with a first through hole and a second through hole, three pairs of uniformly distributed sixth through holes are arranged at two sides of the lower end part, the first through hole is connected with an insulation pull rod customized by a stretching machine through a pin, and the second through hole is used for being connected with a power-on cable, so that the power-on test of the high-temperature superconducting cable test sample is realized.
The welding module comprises a welding plate, the welding plate is arranged at the lower end of the power-on module and is fixed through a sixth through hole; the method comprises the steps that a first groove is formed in the length direction of a welding plate, an arc-shaped soldering tin groove is formed in the first groove in the same direction, the arc-shaped soldering tin groove is communicated with a third through hole in one end of the welding plate, in the specific working process, the end portion of a high-temperature superconducting cable sample is inserted into the arc-shaped soldering tin groove from the third through hole, then the arc-shaped soldering tin groove is filled with solder, heating is conducted, and therefore the end portion of the high-temperature superconducting cable sample is fixed in the welding plate.
The above aims to achieve: make sample both ends adopt the welding form centre gripping, can avoid the tip damage that conventional mechanical clamping caused, can not lead to the fact the centre gripping position fracture because of the stress concentration of tip when guaranteeing tensile or twist reverse simultaneously very big having avoided simultaneously that the sample takes place to slide or the circumstances such as drop because of the anchor clamps material leads to the fact the centre gripping not hard up with the thermal contraction coefficient difference of sample material under the low temperature, and the experimental validity and the reliability of having effectively promoted.
Further optimization, the arc-shaped soldering tin groove and the third through hole are coaxially arranged; the device is used for positioning and centering the high-temperature superconducting cable test sample.
Further optimally, the first groove is also internally provided with a tin storage tank arranged along the length direction of the first groove, and the two sides of the arc-shaped tin storage tank are both provided with the tin storage tanks; used for receiving the solder overflowing from the arc-shaped soldering tin groove.
Preferably, the welding module further comprises a baffle, the first groove penetrates through the other end of the welding plate, the other end of the welding plate is provided with a second groove for placing the baffle, and the baffle is used for closing the end part of the first groove; for preventing solder from flowing out of the solder pot.
Preferably, the other end of the welding plate is provided with a first threaded hole, the baffle plate is further provided with a fourth through hole, and a first screw is arranged between the fourth through hole and the first threaded hole; for making a detachable connection.
Further preferably, the welding module further comprises a cover plate for closing the top of the first groove; the first groove top is used for closing the top of the first groove, so that the end part of the sample can be conveniently fixed.
Preferably, a second threaded hole is further formed in the first groove, a fifth through hole is further formed in the cover plate, and a second screw is arranged between the fifth through hole and the second threaded hole; for making a detachable connection.
Preferably, the third through hole is a threaded through hole, a threaded clamping head is screwed outside the third through hole, and an eighth through hole communicated with the first groove is formed in the center of the threaded clamping head; the method is used for adapting to high-temperature superconducting cable samples with different sizes.
Preferably, a sixth through hole is further formed in the electrifying module, a seventh through hole is further formed in the welding plate, and bolts penetrate through the sixth through hole and the seventh through hole; for the detachable connection of the solder bumps.
Further preferably, the experimental method of the welding type conductive experimental fixture for the high-temperature superconducting cable comprises the following steps:
the method comprises the following steps: obtaining a high-temperature superconducting cable sample, marking the two ends of the high-temperature superconducting cable sample with the same length, and smearing soldering flux;
step two: arranging an upper part and a lower part at two ends of the high-temperature superconducting cable sample respectively, and penetrating the end part of the high-temperature superconducting cable sample into the arc-shaped soldering tin groove through the third through hole;
step three: filling the arc-shaped soldering tin groove with soldering tin materials, placing the arc-shaped soldering tin groove on a heating table for heating after filling, and waiting for cooling after heating;
step four: after cooling, connecting an insulating pull rod of the stretcher to the first through hole, and connecting the electrified cable to the second through hole;
step five: then installing a relevant extensometer or strain gauge for testing and a current and voltage signal transmission line, and then putting the strain gauge or strain gauge into a low-temperature dewar tank to finish the stretching or twisting test process;
step six: and after the test is finished, putting the superconducting cable into the heating table again for heating, and taking out the high-temperature superconducting cable sample after the heating is finished.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the invention aims to provide a welding type conduction experiment fixture for a high-temperature superconducting cable and a method thereof, wherein two ends of a sample are clamped in a welding mode, so that end damage caused by conventional mechanical clamping can be avoided, the clamping part is prevented from being broken due to stress concentration of the end when the sample is stretched or twisted, meanwhile, the situations that the sample slides or falls off and the like caused by clamping looseness due to different thermal shrinkage coefficients of a clamp material and a sample material at low temperature are greatly avoided, and the effectiveness and the reliability of the test are effectively improved;
2. the invention aims to provide a welding type conduction experiment fixture for a high-temperature superconducting cable and a method thereof, wherein a power-on module of the experiment fixture and a welding module both adopt red copper or chromium zirconium copper with good conductivity, so that the power-on-line test of the mechanical property of the high-temperature superconducting cable is facilitated;
3. the invention aims to provide a welding type conduction experiment fixture for a high-temperature superconducting cable and a method thereof, wherein a tin storage tank structure is adopted, and silver silicone grease is utilized to fill gaps among a baffle plate, a screw thread chuck, a through hole, a welding module and a sample, so that soldering tin can be effectively prevented from flowing out along the gaps during heating, and cannot overflow to the surface of the welding module due to the extrusion of a cover plate;
4. the invention aims to provide a welding type conduction experiment clamp for a high-temperature superconducting cable and a method thereof, wherein the shape of a sample clamped by the experiment clamp does not need to be processed into a U shape, an I shape or other complex shapes, and the clamping test requirement of a round or square sample of the high-temperature superconducting cable is better met;
5. the invention aims to provide a welding type conduction experiment fixture for a high-temperature superconducting cable and a method thereof, wherein the experiment fixture is provided with a thread chuck for positioning, and can ensure the centering property and the coaxiality in the stress direction when a sample is installed;
6. the invention aims to provide a welding type conduction experiment clamp for a high-temperature superconducting cable and a method thereof.
7. The invention aims to provide a welding type conduction experiment clamp for a high-temperature superconducting cable and a method thereof, wherein the experiment clamp and the experiment method can be suitable for any type of high-temperature superconducting cable structure and can meet the mechanical property tests of tension, fatigue, torsion and the like under normal-temperature, low-temperature and low-temperature electrifying conditions.
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 overall structure diagram of an embodiment of the present invention;
FIG. 2 is an isometric view of an upper member of an embodiment provided by the present invention;
FIG. 3 is an isometric view of a conductive module according to an embodiment of the present invention;
FIG. 4 is a front plan view of a welding module according to an embodiment of the present invention;
FIG. 5 is another end side view of a weld block according to one embodiment of the present invention;
FIG. 6 is a side view of one end of a weld block according to one embodiment of the present invention;
FIG. 7 is an isometric view of a cover plate according to an embodiment of the present invention;
FIG. 8 is an isometric view of a baffle of an embodiment provided by the present invention;
fig. 9 is an isometric view of a screw clamp according to an embodiment of the present invention;
FIG. 10 is a graph of normalized critical current versus stress for a Shanghai superconducting sample according to an embodiment of the present invention;
FIG. 11 is a graph of normalized critical current versus stress for a Suzhou new material sample in accordance with an embodiment of the present invention;
fig. 12 is a graph of normalized critical current versus twist pitch for a sample of suzhou new material according to an embodiment of the present invention.
Reference numbers and corresponding part names in the figures:
1-a first through hole, 2-a second through hole, 3-a sixth through hole, 4-a welding plate, 5-a cover plate, 6-a baffle, 7-a screw chuck, 8-a second groove, 9-a first threaded hole, 10-a first groove, 11-a circular arc soldering tin groove, 12-a tin storage tank, 13-a second threaded hole, 14-a seventh through hole, 15-a third through hole, 16-a fifth through hole, 17-a fourth through hole, 18-an eighth through hole, 19-a bolt, 20-a second screw, 21-a first screw and 22-a high-temperature superconducting cable sample.
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 the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.
Example 1
As shown in fig. 1 to 9, the present embodiment 1 provides a welding type conduction test jig for a high temperature superconducting cable, including an upper member and a lower member;
the upper and lower parts each comprise:
and a power-on module: the electrifying module is provided with a first through hole 1 connected with the insulating pull rod of the stretcher and a second through hole 2 connected with an electrifying cable;
welding the module: the welding module comprises a welding plate 4, the welding plate 4 is fixed on the power-on module, a first groove 10 is formed in the middle of the welding plate 4 along the length direction of the welding plate, an arc-shaped soldering tin groove 11 is further formed in the middle of the first groove 10 along the length direction of the welding plate, a third through hole 15 communicated with the arc-shaped soldering tin groove 11 is formed in one end of the welding plate 4, and a high-temperature superconducting cable sample 22 is inserted into the arc-shaped soldering tin groove 11 through the third through hole 15; the arc-shaped soldering tin grooves 11 are filled with solder.
Compared with the prior art, the welding type conductive experiment clamp for the high-temperature superconducting cable is used for testing mechanical performance parameters such as stretching and twisting pitch of the high-temperature superconducting cable at low temperature, and therefore reliable experiment bases are provided for design and manufacture of the high-temperature superconducting multistage cable and the magnet. In the specific scheme, the device comprises an upper part and a lower part, wherein the upper part and the lower part are respectively arranged at two ends of a high-temperature superconducting cable sample 22 and are arranged in an up-and-down symmetrical mode, the structures and the connection modes of the upper part and the lower part are the same, the structures of the upper part and the lower part respectively comprise a power-on module and a welding module, the upper end part of the power-on module is provided with a first through hole 1 and a second through hole 2, three pairs of uniformly distributed sixth through holes 3 are arranged at two sides of the lower end part, the first through hole 1 is connected with an insulation pull rod customized by a stretcher through a pin, and the second through hole 2 is used for being connected with a power-on cable, so that the power-on test of the high-temperature superconducting cable sample 22 is realized.
The welding module comprises a welding plate 4, the welding plate 4 is arranged at the lower end of the power-on module and is fixed through the sixth through hole 3; the first groove 10 is arranged on the welding plate 4 along the length direction, the arc-shaped soldering tin groove 11 arranged in the same direction is further arranged inside the first groove 10, the arc-shaped soldering tin groove 11 is communicated with the third through hole 15 at one end of the welding plate 4, in the specific working process, the end part of the high-temperature superconducting cable sample 22 is inserted into the arc-shaped soldering tin groove 11 from the third through hole 15, then the arc-shaped soldering tin groove 11 is filled with solder, and heating is carried out, so that the end part of the high-temperature superconducting cable sample 22 is fixed in the welding plate 4.
The above aims to achieve: make sample both ends adopt the welding form centre gripping, can avoid the tip damage that conventional mechanical clamping caused, can not lead to the fact the centre gripping position fracture because of the stress concentration of tip when guaranteeing tensile or twist reverse simultaneously very big having avoided simultaneously that the sample takes place to slide or the circumstances such as drop because of the anchor clamps material leads to the fact the centre gripping not hard up with the thermal contraction coefficient difference of sample material under the low temperature, and the experimental validity and the reliability of having effectively promoted.
In a further scheme, the arc-shaped soldering tin groove 11 and the third through hole 15 are coaxially arranged; for positioning and centering with the high temperature superconducting cable coupon 22.
Referring to fig. 4, 5 and 6, as a specific embodiment for receiving solder overflowing from the arc-shaped solder groove 11, a solder storage groove is further disposed in the first groove 10 along the length direction of the first groove, and the solder storage grooves are disposed on both sides of the arc-shaped solder groove 11; in the scheme, the first groove 10 is also internally provided with tin storage tanks which are respectively arranged at two sides of the arc-shaped soldering tin tank 11 and are arranged in the same direction, and the tin storage tanks can be used for storing solder overflowing from the arc-shaped soldering tin tank 11 in the welding process; the tin storage tank is preferably a square tin storage tank.
Referring to fig. 2 and 8, as a specific embodiment for preventing solder from flowing out of a solder bath, the soldering module further includes a baffle 6, the first groove 10 penetrates through the other end of the soldering board 4, the other end of the soldering board 4 is provided with a second groove 8 for placing the baffle 6, and the baffle 6 is used for closing the end of the first groove 10; in this scheme, still be provided with baffle 6, be equipped with second recess 8 at the other end department of welded plate 4, baffle 6 sets up in second recess 8, can seal the tip of first recess 10 to prevent that the solder from flowing from the soldering tin groove.
In a further scheme, in order to realize detachable connection, the other end of the welding plate 4 is provided with a first threaded hole 9, the baffle plate 6 is also provided with a fourth threaded hole 17, and a first screw 21 is arranged between the fourth threaded hole 17 and the first threaded hole 9; in the scheme, the first screw 21 penetrates through the fourth through hole 17 and is connected with the first threaded hole 9, so that the baffle 6 can be detachably connected; the size of the baffle 6 is preferably the same as the size of the second groove 8, i.e. flush with the end of the welded plate 4; in the specific experiment process, silver silicone grease is required to be filled in the gap between the baffle 6 and the welding block, and the solder is further prevented from flowing out along the gap when being heated.
Referring to fig. 2 and 7, as an embodiment for closing the top of the first groove 10, the welding module further includes a cover plate 5, where the cover plate 5 is used for closing the top of the first groove 10; in this scheme, be equipped with apron 5 at first recess 10 top, wherein apron 5 can stretch into in first recess 10, realizes the closure of first recess 10, the fixed of the sample tip of being convenient for.
In a further scheme, in order to realize detachable connection, a second threaded hole 13 is further formed in the first groove 10, a fifth through hole 16 is further formed in the cover plate 5, and a second screw 20 is arranged between the fifth through hole 16 and the second threaded hole 13; in the scheme, a plurality of threaded holes 13 and a plurality of second threaded holes 13 are formed in the first groove 10, a plurality of fifth through holes 16 matched with the first through holes are formed in the cover plate 5, and second screws 20 penetrate through the fifth through holes 16 and are connected with the second threaded holes 13, so that the cover plate 5 is detachable, and the size of the cover plate 5 is matched with the distance from the upper end of the first groove 10 to the lower recess; in the specific experiment process, silver silicone grease is required to be filled in the gap between the cover plate 5 and the welding block, and the soldering tin is further prevented from flowing out along the gap when being heated.
Referring to fig. 2 and 9, as a specific embodiment of adapting to high temperature superconducting cable samples 22 with different sizes, the third through hole 15 is a threaded through hole, a thread clamp 7 is screwed outside the third through hole 15, and an eighth through hole 18 communicated with the first groove 10 is arranged in the center of the thread clamp 7; in the scheme, a thread chuck 7 is further arranged on the third through hole 15, wherein the third through hole 15 is a thread through hole, the thread chuck 7 is connected to the third through hole 15 in a threaded manner to realize detachable connection, the thread chuck 7 is a replaceable component, the size of the eighth through hole 18 in the center of the thread chuck can be customized according to the size of the high-temperature superconducting cable sample 22, and the shape of the through hole can also be circular or rectangular; in the specific experiment process, silver silicone grease is required to be filled in the gap between the screw thread chuck 7 and the third through hole 15, so that solder is further prevented from flowing out along the gap when being heated; the thread clamp 7 is used for fixing, positioning and centering the high-temperature superconducting cable sample 22 in cooperation with other settings of the welding module.
Referring to fig. 2, a sixth through hole 3 is further formed in the power-on module, a seventh through hole 14 is further formed in the welding plate 4, and a bolt 19 is arranged on the sixth through hole 3 and the seventh through hole 14 in a penetrating manner; for the detachable connection of the solder bumps.
In a further scheme, the sixth through hole 3 of the power-on module and the seventh through hole 14 of the welding module correspond in position and are the same in size.
In a further embodiment, the first threaded hole 9 and the second threaded hole 13 have the same specification, the fifth through hole 16 and the fourth through hole 17 have the same size, and the second screw 20 and the first screw 21 have the same specification.
In a further scheme, the size of the second groove 8 at the upper end of the power-on module is the same as that of the baffle 6, and the size and the concave distance of the first groove 10 at the center of the power-on module are the same as those of the cover plate 5.
Further, the screw chuck 7 is a replaceable member, and the size of the eighth through hole 18 at the center thereof can be customized according to the size of the hts cable test piece 22, and the shape of the through hole can be circular or rectangular.
In a further scheme, the material for manufacturing the upper component module and the lower component module adopts red copper with good electric conductivity.
In a further aspect, the material of the bolt 19, the second screw 20 and the first screw 21 is 316 or 314 stainless steel material.
In a further scheme, the outer edges of the power-on module and the welding module are subjected to chamfering and rounding treatment.
Example 2
The present embodiment 2 is further limited by the embodiment 1, and provides an experimental method of a welding type conductive experimental fixture for a high temperature superconducting cable, the method includes the following specific steps:
step 1: preparing a high-temperature superconducting cable sample 22 with a proper length, marking two end parts of the sample with a proper length, and uniformly coating the soldering flux, so that the welding strength is prevented from being reduced due to the fact that the surfaces of a copper pipe or a metal material of the cable are oxidized during welding, and the sample and a clamp are prevented from sliding relatively or directly falling off during experiments.
And 2, step: the baffle 6 in the welding module is fixed in the second groove 8 at the other end of the welding block through a first screw 21.
And 3, step 3: and (3) penetrating two ends of the high-temperature superconducting cable sample 22 through the eighth through hole 18 of the screw clamp 7 and inserting the high-temperature superconducting cable sample into the circular arc-shaped soldering tin groove 11 of the welding module.
And 4, step 4: silver silicone grease is used for filling gaps among the baffle 6, the screw clamp head 7, the eighth through hole 18 and the welding module and the sample, and solder is prevented from flowing out along the gaps when being heated.
And 5: and filling the arc-shaped soldering tin groove with a soldering tin material, and placing the upper and lower welding modules with the samples on the heating table after filling.
And 6: and heating the upper and lower electrifying modules by using a heating table, controlling the temperature to be about 200 ℃, and supplementing solder properly according to the situation after the solder to be welded is melted to ensure that the whole arc-shaped soldering tin groove is filled with the solder.
And 7: after the solder is filled, the power supply of the heating table is turned off, and the cover plate 5 is quickly covered and fixed by the second screws 20.
And 8: after the welding modules of the upper and lower parts are completely cooled, the energizing modules and the welding modules of the upper and lower parts are connected and fixed by using bolts 19 through the sixth through hole 3 and the seventh through hole 14.
And step 9: and the upper and lower components are arranged on the upper and lower insulating pull rods of the drawing machine through the first through holes 1 and the pins, so that the centering and fixing of the test sample are realized, and the cable is connected to the second through hole 2 of the electrifying module.
Step 10: and installing a relevant extensometer or strain gauge for testing and a current and voltage signal transmission line, and then putting the strain gauge or strain gauge into a low-temperature dewar tank to finish the stretching or twisting test process.
Step 11: and after the test is finished, the temperature is returned to the room temperature, the upper part and the lower part are placed on a heating table, the temperature is heated to 200 ℃, the sample is taken out, the solder is removed completely, the sample is placed in an experiment cabinet when the sample is cooled to the room temperature, and the test is finished.
Example 3
As shown in fig. 10 to 12, the present example 3 is further defined on the basis of the example 2, and provides a specific experimental method.
Referring to fig. 10 and 11, the high temperature superconducting cable samples prepared from the high temperature superconducting tapes provided by the shanghai superconducting and suzhou new materials were respectively selected for testing by using the above test methods. The high-temperature superconducting cable with the sample diameter of 4mm is composed of an oxygen-free copper pipe, 20 high-temperature superconducting strips with the length of 2mm and a filling material, the length of the cable is 50cm, the effective length of the cable is 30cm, the distance of a voltage lead is 5cm, the test temperature is liquid nitrogen 77K, and the variation curves of normalized critical current of samples of Shanghai superconductivity and Suzhou new materials obtained through testing along with stress are respectively shown in a graph 10 and a graph 11.
Referring to fig. 12, a cable sample prepared from a high-temperature superconducting tape provided by a new suzhou material is selected for testing by using the above test method. The high-temperature superconducting cable with the sample diameter of 4mm is composed of an oxygen-free copper pipe, 20 high-temperature superconducting tapes with the length of 2mm and a filling material, the length of the cable is 50cm, the effective length of the cable is 30cm, the distance of a voltage lead is 5cm, the test temperature is liquid nitrogen 77K, and a variation curve of normalized critical current obtained by the test along with the torsion pitch is shown in figure 12.
It can be seen from the above embodiments that the maximum tensile stress and the maximum torsion angle applied during the test process are 580Mpa and 720 degrees respectively when the low-temperature electrified tensile and torsion tests of the high-temperature superconducting cable are performed by using the method and the patent of the invention. After the test is finished, the phenomenon that the strand is loosened or slides relatively is not found, and a good change curve of the normalized critical current along with the tensile stress or the torsional pitch is obtained, and the result shows that the test result obtained by adopting the patent and the test method is good and reliable.
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 welding type conduction experiment clamp for a high-temperature superconducting cable is characterized by comprising an upper part and a lower part;
the upper and lower parts each include:
and a power-on module: the electrifying module is provided with a first through hole (1) connected with the insulating pull rod of the stretcher and a second through hole (2) connected with an electrifying cable;
welding the module: the welding module comprises a welding plate (4), the welding plate (4) is fixed on the electrifying module, a first groove (10) is formed in the middle of the welding plate (4) along the length direction of the welding plate, an arc-shaped soldering tin groove (11) arranged along the length direction of the welding plate is further formed in the middle of the first groove (10), a third through hole (15) communicated with the arc-shaped soldering tin groove (11) is formed in one end of the welding plate (4), and a high-temperature superconducting cable sample (22) penetrates into the arc-shaped soldering tin groove (11) through the third through hole (15); the arc-shaped soldering tin grooves (11) are filled with solder.
2. The welding-type conduction test jig for the high-temperature superconducting cable according to claim 1, wherein the arc-shaped soldering tin groove (11) and the third through hole (15) are coaxially arranged.
3. The welding type conduction experiment clamp for the high-temperature superconducting cable according to claim 2, wherein a tin storage groove (12) is further arranged in the first groove (10) along the length direction of the first groove, and the tin storage groove (12) is arranged on each of two sides of the arc-shaped tin storage groove (11).
4. The welding-type conducting experimental fixture for the high-temperature superconducting cable according to claim 1, wherein the welding module further comprises a baffle (6), the first groove (10) penetrates the other end of the welding plate (4), the other end of the welding plate (4) is provided with a second groove (8) for placing the baffle (6), and the baffle (6) is used for closing the end of the first groove (10).
5. The welding type conduction test fixture for the HTC cable as claimed in claim 4, wherein said welding plate (4) has a first threaded hole (9) at the other end thereof, said shield plate (6) further has a fourth through hole (17), and a first screw (21) is disposed between said fourth through hole (17) and said first threaded hole (9).
6. The welding-type conducting test fixture for the high-temperature superconducting cable according to claim 4, wherein the welding module further comprises a cover plate (5), and the cover plate (5) is used for closing the top of the first groove (10).
7. The welding type conduction experiment fixture for the high temperature superconducting cable according to claim 6, wherein a second threaded hole (13) is further formed in the first groove (10), a fifth through hole (16) is further formed in the cover plate (5), and a second screw (20) is arranged between the fifth through hole (16) and the second threaded hole (13).
8. The welding type conduction test jig for the hts cable of claim 1, wherein the third through hole (15) is a screw through hole, a screw chuck (7) is screwed to the outside of the third through hole (15), and an eighth through hole (18) communicating with the first groove (10) is formed in the center of the screw chuck (7).
9. The welding type conduction experiment fixture for the high temperature superconducting cable according to claim 1, wherein a sixth through hole (3) is further formed in the electrifying module, a seventh through hole (14) is further formed in the welding plate (4), and bolts (19) are arranged on the sixth through hole (3) and the seventh through hole (14) in a penetrating manner.
10. The experimental method of the welding-type conductive experimental fixture for the high-temperature superconducting cable as claimed in any one of claims 1 to 9, wherein the experimental method comprises the following steps:
the method comprises the following steps: obtaining a high-temperature superconducting cable sample (22), marking the two ends of the high-temperature superconducting cable sample (22) with the same length, and smearing soldering flux;
step two: an upper part and a lower part are respectively arranged at two ends of a high-temperature superconducting cable sample (22), and the end part of the high-temperature superconducting cable sample (22) is penetrated into the arc-shaped soldering tin groove (11) through a third through hole (15);
step three: filling the arc-shaped soldering tin groove (11) with soldering tin materials, placing the arc-shaped soldering tin groove on a heating table for heating after the arc-shaped soldering tin groove is filled with the soldering tin materials, and waiting for cooling after the arc-shaped soldering tin groove is heated;
step four: after cooling, connecting an insulating pull rod of the stretcher to the first through hole (1), and connecting an electrified cable to the second through hole (2);
step five: then installing a relevant extensometer or strain gauge for testing and a current and voltage signal transmission line, and then putting the strain gauge or strain gauge into a low-temperature dewar tank to finish the stretching or twisting test process;
step six: and after the test is finished, putting the superconducting cable into the heating table again for heating, and taking out the high-temperature superconducting cable sample (22) after the heating is finished.
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