CN116718476A - Tensile strength testing tool and testing method for superconducting bridge joint - Google Patents
Tensile strength testing tool and testing method for superconducting bridge joint Download PDFInfo
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- CN116718476A CN116718476A CN202310984176.4A CN202310984176A CN116718476A CN 116718476 A CN116718476 A CN 116718476A CN 202310984176 A CN202310984176 A CN 202310984176A CN 116718476 A CN116718476 A CN 116718476A
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- 238000012360 testing method Methods 0.000 title claims abstract description 87
- 230000000149 penetrating effect Effects 0.000 claims abstract description 28
- 230000005489 elastic deformation Effects 0.000 claims abstract description 4
- 230000002093 peripheral effect Effects 0.000 claims description 31
- 230000006835 compression Effects 0.000 claims description 26
- 238000007906 compression Methods 0.000 claims description 26
- 238000003466 welding Methods 0.000 claims description 17
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 4
- 238000005476 soldering Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000005219 brazing Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 235000012771 pancakes Nutrition 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the technical field of superconducting joint testing and discloses a tensile strength testing tool for a superconducting bridge joint, which comprises a mounting frame, a mounting piece and a driving piece, wherein the mounting piece is provided with elastic deformation, the mounting piece is arranged in the mounting frame and is provided with a mounting hole penetrating through the mounting piece in the up-down direction, the outer circumferential surface of the mounting piece is suitable for mounting the superconducting bridge joint, the driving piece is provided with a driving part and an expansion part, the driving part is arranged on the mounting frame in a penetrating manner and can move in the up-down direction relative to the mounting frame, the expansion part is arranged at the lower end of the driving part, the cross section area of the expansion part is gradually reduced from top to bottom, and at least part of the expansion part is arranged in the mounting hole of the mounting piece in a penetrating manner so that the expansion part drives the mounting piece to expand outwards in the inside-outside direction to enable the superconducting bridge joint to be stressed outwards. The tensile strength test fixture of the superconducting bridge joint is simple in structure, and the test working condition is more fit with the actual running condition.
Description
Technical Field
The invention relates to the technical field of superconducting joint testing, in particular to a tensile strength testing tool and a tensile strength testing method for a superconducting bridge joint.
Background
In the development of high temperature superconducting magnets, superconducting joints are often the areas where the magnet performance is the weakest. In practical winding of superconducting magnets, since the length of a single superconducting wire is limited, and the magnets are generally wound into a stack of pancake coils, the different superconducting wires inside the magnets need to be connected to each other, and in order to reduce the overall joule heat inside the magnets, the joints between the wires are also generally made of superconducting materials. One common form of superconducting joint is a bridge lap joint, in which a bridge path is formed by welding a wide length of superconducting tape to two superconducting single tapes simultaneously.
In the related art, the actual working condition of the superconducting bridge joint cannot be simulated, and the test result of the superconducting bridge joint is inaccurate.
Disclosure of Invention
The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:
in the related art, in the actual test of a magnet, the superconducting joint often bears huge lorentz force due to larger field intensity and working current, and the special-shaped structure of the joint enables the superconducting joint to be more easily damaged in performance compared with a single belt, so that the overall through-flow capacity of the magnet is affected. The superconducting bridge joint tends to bend into a circular configuration in a double pancake coil, expands outwardly under the influence of lorentz forces, and creates tensile strain in the circumferential direction. In order to test the mechanical properties of the bridge joint, the bridge joint is placed on the outer side of a circular supporting block, two ends of the bridge joint are connected to a stretcher, and the stretching load is applied by the stretcher to simulate the stretching working condition of the bridge joint. However, the superconducting bridge joint is actually forced in the magnet in such a manner that it expands outwardly while being stretched.
In addition, for example, patent numbers: 202310532259. X-A tensile test fixture for high temperature superconductive double cake coil inner joint, when using the stretcher to test, the joint is in inward compression and stretching state, which is different from the actual stress condition, so that certain deviation exists in the test result. Meanwhile, the test means can only test the joint with the welding area smaller than the semicircle, and in order to reduce the joint resistance in the actual magnet, the length of the joint is often smaller than the semicircle range, and the longer joint cannot be effectively tested. And because the superconducting joint, especially the weakest area in the operation of high-field magnet, the performance limit and the safety of the high-field magnet are directly influenced by the accurate performance characterization of the superconducting joint, and the superconducting joint has important technical research value.
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the embodiment of the invention provides a tensile strength testing tool for a superconducting bridge joint, which can achieve the purpose that a testing working condition is close to an actual running working condition, and has the advantages of strong independence, high testing accuracy and simplicity in operation.
The embodiment of the invention provides a tensile strength testing method of a superconducting bridge joint, which has the advantages of simple testing steps and accurate testing results.
The tensile strength test tool for the superconducting bridge joint comprises: a mounting frame; a mounting member having elastic deformation, the mounting member being provided in the mounting frame and having a mounting hole penetrating the mounting member in an up-down direction, an outer circumferential surface of the mounting member being adapted to mount a superconducting bridge joint; the driving piece, the driving piece has drive division and expansion portion, drive division wears to establish on the mounting bracket and for the mounting bracket is along upper and lower direction movable, the expansion portion is established the lower extreme of drive division just the cross-sectional area of expansion portion reduces from the top down gradually, at least part of expansion portion wears to establish in the mounting hole of mounting piece, so that the expansion portion drive the mounting piece is outwards expanded along inside and outside direction so that the superconductive bridging joint receives the stress of outwards expanding.
Alternatively, the cross-sectional area of the inner peripheral surface of the mounting hole gradually decreases from top to bottom and is matched with the outer peripheral surface of the expansion part, and the cross-sectional area of the outer peripheral surface of the mounting piece is constant from top to bottom.
Alternatively, the dimension of the mount in the up-down direction is smaller than the dimension of the expansion portion in the up-down direction.
Optionally, the tensile strength testing tool of the superconducting bridge joint further includes: the first current terminal is arranged on the mounting frame and is suitable for being electrically connected with one end of the superconducting bridge joint; and the second current terminal is arranged on the mounting frame and is suitable for being electrically connected with the other end of the superconducting bridge joint so that the first current terminal and the second current terminal electrify the superconducting bridge joint.
Optionally, the tensile strength testing tool of the superconducting bridge joint further comprises a first compression block and a second compression block, the first compression block is arranged on the first current terminal through a fastener, one end of the superconducting bridge joint is arranged between the first compression block and the first current terminal, so that the superconducting bridge joint is installed on the first current terminal, the second compression block is arranged on the second current terminal through a fastener, and the other end of the superconducting bridge joint is arranged between the second compression block and the second current terminal, so that the superconducting bridge joint is installed on the second current terminal.
Optionally, the mounting bracket includes roof, bottom plate and support piece, support piece extends along upper and lower direction just the roof with the bottom plate is all established on the support piece and along upper and lower direction interval setting, the installed part is established on the bottom plate, drive portion wears to establish on the roof and for the roof is along upper and lower direction movable.
Optionally, the top plate is movable along an up-down direction relative to the supporting piece, the bottom plate is movable along an up-down direction relative to the supporting piece, the test fixture further comprises a first positioning piece and a second positioning piece, the first positioning piece is arranged on the supporting piece in a penetrating mode and is connected with the top plate so as to position the top plate, and the second positioning piece is arranged on the supporting piece in a penetrating mode and is connected with the bottom plate so as to position the bottom plate.
Optionally, the tensile strength testing tool of the superconducting bridge joint further includes: the first positioning part is arranged on the upper end surface of the bottom plate, and is provided with a first through hole penetrating through the first positioning part; the second positioning part is arranged on the outer peripheral side of the mounting piece, a limiting groove extending along the circumferential direction of the mounting piece is formed in the lower end face of the second positioning part, the second positioning part is arranged on the first positioning part, the upper end face of the first positioning part abuts against the lower end face of the limiting groove, and at least part of the expansion part penetrates through the mounting piece and is located in the first through hole.
Optionally, the driving portion extends along the upper and lower direction and the outer peripheral face of driving portion is equipped with the external screw thread, the roof of mounting bracket is equipped with along the upper and lower direction run through the screw thread through-hole of roof, the driving portion wears to establish in the screw thread through-hole and the external screw thread with screw thread through-hole cooperation so that the driving portion reciprocates, test fixture still includes the end cover, the end cover is established the top of expansion portion, be equipped with on the end cover along the upper and lower direction run through the second through-hole of end cover, the lower tip of driving portion is worn to establish rotatably in the end cover through the second through-hole so that the driving portion drive the expansion portion reciprocates, in the projection plane of quadrature in the upper and lower direction, the projection of second through-hole is located in the projection of the lower tip of driving portion.
According to the tensile strength testing tool for the superconducting bridge joint, the installation piece and the driving piece are arranged, so that the internal expansion type tensile strength testing can be conducted on the superconducting bridge joint, the through-flow performance of the superconducting bridge joint is tested in real time by utilizing the first current terminal and the second current terminal in the tensile testing, the testing tool can apply uniform outward expansion displacement to the bridge joint, and therefore tensile stress is applied, and the actual stress condition of the bridge joint in a magnet is more attached. And the test fixture is self-integrated, external equipment such as a stretcher is not needed, the independence is strong, and the use condition requirement is low. In addition, the test tool has important application value for the tensile strength characterization of the superconducting bridge joint, and has important reference significance for the safety check and the protection structure design of the superconducting magnet.
According to the tensile strength testing method of the superconducting bridge joint provided by the embodiment of the invention, the testing tool used in any one of the above embodiments comprises: s1: the superconducting bridge joint comprises a first single belt, a second single belt and a bridging belt, wherein the end part of the first single belt is bent to form a first circular ring, the end part of the second single belt is bent to form a second circular ring, the central line of the first circular ring and the central line of the second circular ring are overlapped, the first circular ring and the second circular ring are sequentially arranged along the thickness direction of the first circular ring, the bridging belt is welded in the first circular ring and the second circular ring, a part of the first single belt is wound on the outer circumferential surface of the first circular ring and is welded through soldering tin, and a part of the second single belt is wound on the outer circumferential surface of the second circular ring and is welded through soldering tin; s2: selecting the mounting parts of the test tools with different sizes according to the loading condition of the superconducting bridge joint, so as to sleeve the first circular ring on the outer circumferential side of the mounting part of the test tool, or sleeve the second circular ring on the outer circumferential side of the mounting part of the test tool, or sleeve the first circular ring and the second circular ring on the outer circumferential side of the mounting part of the test tool; s3: the driving piece of the test tool is driven to drive the mounting piece to expand outwards along the inner and outer directions, so that the first circular ring and the second circular ring are subjected to outward expansion stress; s4: strain gages are arranged at both ends of the welding area of the bridge strap so as to detect tensile strain to which the first ring and the second ring are subjected.
Drawings
Fig. 1 is a schematic structural diagram of a tensile strength testing tool for a superconducting bridge joint according to an embodiment of the present invention.
Fig. 2 is a perspective view of a tensile strength testing tool for a superconducting bridge joint according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a superconducting bridge joint according to an embodiment of the present invention.
Fig. 4 is a front view of a superconducting bridge joint according to an embodiment of the present invention.
Fig. 5 is a rear view of a superconducting bridge joint of an embodiment of the present invention.
A tensile strength test fixture 100 for a superconducting bridge joint;
a mounting frame 1; a top plate 11; a bottom plate 12; a first through hole 121; a first positioning portion 122; a support 13;
a mounting member 2; a mounting hole 21; a second positioning portion 22;
a driving member 3; a driving section 31; a groove 311; an expansion portion 32; a first current terminal 4; a second current terminal 5;
a first compression block 6; a second compaction block 7; an end cap 8;
a superconducting bridge joint 9; a first single belt 91; a first annular ring 911; a second single band 92; a second ring 921; a bridging belt 93; a solder joint portion 94; a strain gage 10.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
A tensile strength test tool of a superconducting bridge joint according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 1 to 5, a tensile strength test fixture for a superconducting bridge joint according to an embodiment of the present invention includes a mounting frame 1, a mounting member 2 having elastic deformation, and a driving member 3.
The mount 2 is provided in the mount 1 and the mount 2 has a mounting hole 21 penetrating the mount 2 in the up-down direction, and an outer peripheral surface of the mount 2 is adapted to mount the superconducting bridge joint 9. Specifically, as shown in fig. 1 to 3, the mounting member 2 may be cylindrical and provided with a mounting hole 21 penetrating the mounting member 2 in the up-down direction, and the mounting member 2 is made of a material having a low elastic modulus, for example: may be, for example, a titanium alloy or other shape memory alloy, thereby enabling deformation of the mounting member 2.
The driving member 3 has a driving portion 31 and an expansion portion 32, the driving portion 31 is provided to be penetrated on the mounting frame 1 and movable in the up-down direction with respect to the mounting frame 1, the expansion portion 32 is provided at the lower end of the driving portion 31 and the cross-sectional area of the expansion portion 32 is gradually reduced from top to bottom, at least part of the expansion portion 32 is penetrated in the mounting hole 21 of the mounting member 2, so that the expansion portion 32 drives the mounting member 2 to expand outwardly in the inside-outside direction to subject the superconducting bridge joint 9 to an outwardly expanding stress. Specifically, as shown in fig. 1 to 3, the driving portion 31 extends in the up-down direction and is provided on the mounting frame 1, the expansion portion 32 is provided at the lower end of the driving portion 31, and the cross-sectional area of the outer peripheral surface of the expansion portion 32 gradually decreases from top to bottom, for example: the expansion part 32 may be a trapezoid table, a truncated cone shape, or the like, the expansion part 32 is made of a rigid material which is not easy to deform, and the lower end of the expansion part 32 extends into the mounting hole 21, so that the expansion part 32 drives the mounting piece 2 to expand outwards, and the superconducting bridge joint 9 is subjected to an outwards expanding force along the inner and outer directions.
According to the tensile strength test tool 100 for the superconducting bridge joint, the driving piece 3 and the mounting piece 2 are arranged, the mounting piece 2 is expanded outwards through the driving piece 3, so that the superconducting bridge joint 9 on the mounting piece 2 is subjected to expansion stress from inside to outside, the internal expansion tensile strength test is carried out on the superconducting bridge joint 9, the actual stress form of the superconducting bridge joint 9 in a magnet is simulated, the test working condition is more fit with the actual running condition, and the accuracy of the detection result of the superconducting bridge joint 9 is improved.
In some embodiments, the cross-sectional area of the inner peripheral surface of the mounting hole 21 gradually decreases from top to bottom and is matched with the outer peripheral surface of the expansion portion 32, and the cross-sectional area of the outer peripheral surface of the mounting member 2 is constant from top to bottom. Specifically, as shown in fig. 1 to 3, the shape of the inner peripheral surface of the mounting hole 21 matches the outer peripheral surface of the expansion portion 32, for example: the mounting hole 21 is a circular truncated cone hole, the expansion part 32 is a circular truncated cone hole, the mounting hole 21 is a trapezoid table hole, and then the expansion part 32 is a trapezoid table, so that when the expansion part 32 is mounted in the mounting hole 21, the outer peripheral surface of the expansion part 32 and the inner peripheral surface of the mounting hole 21 are tightly attached, the outline shape of the outer peripheral surface of the mounting member 2 can be cylindrical or polygonal column, and therefore, when the expansion part 32 is mounted in the mounting hole 21, the outer peripheral surface of the mounting member 2 can be uniformly expanded, and the superconducting bridge joint 9 is subjected to uniform outward acting force.
In some embodiments, the mounting frame 1 includes a top plate 11, a bottom plate 12 and a supporting member 13, the supporting member 13 extends in an up-down direction, the top plate 11 and the bottom plate 12 are both disposed on the supporting member 13 and are disposed at intervals in the up-down direction, the mounting member 2 is disposed on the bottom plate 12, and the driving portion 31 is disposed on the top plate 11 in a penetrating manner and is movable in the up-down direction relative to the top plate 11. Specifically, as shown in fig. 1, the number of the supporting members 13 is 4 (4 as shown in fig. 1), the supporting members 13 extend in the up-down direction, the 4 supporting members 13 are arranged at intervals in the front-back direction and are divided into two groups, each group includes two supporting members 13 arranged at intervals in the left-right direction, the upper end portions of the supporting members 13 are connected with the top plate 11, and the lower end portions of the supporting members 13 are connected with the bottom plate 12, thereby, the mounting frame 1 is made to form a rectangular frame, and the mounting frame 1 is made to be arranged more reasonably.
In some embodiments, the tensile strength testing tool 100 of the superconducting bridge joint further comprises a first current terminal 4 and a second current terminal 5.
The first current terminal 4 is arranged on the mounting frame 1, the first current terminal 4 is suitable for being electrically connected with one end of the superconducting bridge joint 9, the second current terminal 5 is arranged on the mounting frame 1, and the second current terminal 5 is suitable for being electrically connected with the other end of the superconducting bridge joint 9, so that the first current terminal 4 and the second current terminal 5 electrify the superconducting bridge joint 9. Specifically, as shown in fig. 1-2, the first current terminal 4 and the second current terminal 5 are both arranged on the bottom plate 12 of the mounting frame 1 and are arranged at intervals along the left-right direction, and the mounting piece 2 is positioned between the first current terminal 4 and the second current terminal 5, so that the superconductive bridge joint 9 is powered by an external power line through the first current terminal 4 and the second current terminal 5, thereby the flowing capability of the superconductive bridge joint 9 under the action of different expansion loads can be tested, the arrangement of the first current terminal 4 and the second current terminal 5 not only ensures that the superconductive bridge joint 9 is convenient to connect with the external power line, but also prevents the external power line from influencing the superconductive bridge joint 9 (for example, the influence of the self weight of the external power line on the superconductive bridge joint 9), and ensures the accuracy of a test result.
In some embodiments, the tensile strength testing tool 100 for a superconducting bridge joint further includes a first compression block 6 and a second compression block 7, the first compression block 6 is disposed on the first current terminal 4 by a fastener and one end of the superconducting bridge joint 9 is disposed between the first compression block 6 and the first current terminal 4, so that the superconducting bridge joint 9 is mounted on the first current terminal 4, the second compression block 7 is disposed on the second current terminal 5 by a fastener and the other end of the superconducting bridge joint 9 is disposed between the second compression block 7 and the second current terminal 5, so that the superconducting bridge joint 9 is mounted on the second current terminal 5. Specifically, as shown in fig. 1-2, the first compression block 6 and the second compression block 7 are terminal copper compression blocks, four threaded holes are formed in the first current terminal 4 and the second current terminal 5, two rows of threaded holes are formed in the up-down direction, each row of threaded holes comprises two threaded holes which are arranged at intervals in the left-right direction, the leading-out ends of the superconducting bridge joint 9 are placed between the two rows of threaded holes, the state of being horizontal and free is maintained, then the superconducting bridge joint 9 is respectively pressed with the first current terminal 4 and the second current terminal 5 by using the first compression block 6 and the second compression block 7, and the superconducting bridge joint 9 is conveniently fixedly installed on the first current terminal 4 and the second current terminal 5 by using bolts for compression and fixation.
It will be appreciated that the outgoing ends of the superconducting bridge joint 9 may also be mounted on the first current terminal 4 and the second current terminal 5 by welding heating and brazing.
In some embodiments, the driving portion 31 extends in the up-down direction, and the outer circumferential surface of the driving portion 31 is provided with external threads, the top plate 11 of the mounting bracket 1 is provided with a threaded through hole penetrating the top plate 11 in the up-down direction, and the driving portion 31 is penetrated in the threaded through hole. Specifically, as shown in fig. 1 to 3, the driving part 31 is screwed by the male screw of the driving part 31 and the screw through hole of the top plate 11 of the mounting bracket 1, whereby the driving part 31 can be moved up and down by rotating the driving part 31.
In some embodiments, the test fixture 100 further includes an end cap 8, the end cap 8 is disposed on top of the expansion portion 32, a second through hole penetrating the end cap 8 along the up-down direction is disposed on the end cap 8, the lower end portion of the driving portion 31 is rotatably penetrated in the end cap 8 through the second through hole, and in a projection plane orthogonal to the up-down direction, a projection of the second through hole is located in a projection of the lower end portion of the driving portion 31. Specifically, as shown in fig. 1 to 3, the end cover 8 includes a first sub-portion and a second sub-portion which are sequentially disposed in the left-right direction, the first sub-portion and the second sub-portion are fastened to form the end cover 8 and are detachably mounted at the upper end of the expansion portion 32 by screws, bolts or clamping, a first sub-groove is disposed at a side of the first sub-portion adjacent to the second sub-portion, a second sub-groove is disposed at a side of the second sub-portion adjacent to the first sub-portion, the first sub-groove and the second sub-groove define a second through hole, a groove 311 is disposed on the outer circumferential surface of the driving portion 31, and the groove 311 extends in the circumferential direction of the driving portion 31 and is disposed adjacent to the lower end portion of the driving portion 31. When the end cap 8 and the driving part 31 are mounted, the first sub part and the second sub part can be buckled on the groove 311, and the outer circumferential surface of the groove 311 and the inner circumferential surface of the second through hole are oppositely arranged along the inner and outer directions, therefore, the lower end part of the driving part 31 is mounted in the end cap 8, the outer circumferential surface of the lower end part of the driving part 31 is arranged along the inner circumferential surface of the end cap 8, so that the driving part is rotatably connected with the expansion part 32, when the superconducting bridge joint 9 needs to be loaded, the driving part 31 is rotated (for example, rotated clockwise) to enable the driving part 31 to move downwards, so that the expansion part 32 can be pushed to move downwards, and when the superconducting bridge joint 9 needs to be unloaded, the driving part 31 is rotated in the opposite direction (for example, rotated anticlockwise) to enable the driving part 31 to move upwards so as to sequentially drive the end cap 8 and the expansion part 32 to be unloaded upwards.
In some embodiments, the test fixture 100 further includes a first positioning portion 122 and a second positioning portion 22.
The first positioning portion 122 is disposed on the upper end surface of the bottom plate 12, the first positioning portion 122 is provided with a first through hole 121 penetrating through the first positioning portion 122, the second positioning portion 22 is disposed on the outer peripheral side of the mounting member 2, the lower end surface of the second positioning portion 22 is provided with a limit groove extending along the circumferential direction of the mounting member 2, the second positioning portion 22 is disposed on the first positioning portion 122, the upper end surface of the first positioning portion 122 abuts against the lower end surface of the limit groove, and at least part of the expansion portion 32 penetrates through the mounting member 2 and is located in the first through hole 121. As shown in fig. 1-3, the first positioning portion 122 is a first boss, the second positioning portion 22 is a second boss, the upper end face of the bottom plate 12 is provided with the first boss, the first boss is provided with a first through hole 121 penetrating through the first boss and the bottom plate 12 along the up-down direction, the outer circumferential surface of the lower end portion of the mounting member 2 is provided with the second boss, the lower end portion of the second boss is provided with a limiting groove, the inner circumferential surface of the limiting groove abuts against the upper end portion of the first through hole 121, so that the mounting member 2 is mounted on the base, and the first through hole 121 is arranged, so that the expansion portion 32 penetrates through the mounting hole 21 and stretches into the first through hole 121, and sufficient gaps are ensured when the expansion portion 32 is pressed downwards, so that the expansion portion 32 can displace downwards.
In some embodiments, the first positioning portion 122 is provided at the center of the base plate 12, and the height of the first positioning portion 122 is 3mm high, increasing the height of the mount 2, and thus the height of the lead-out end of the superconducting bridge joint 9, so that it can be horizontally contact-connected with the first current terminal 4 and the second current terminal 5.
In some embodiments, the top plate 11 is movable in an up-down direction relative to the supporting member 13, the bottom plate 12 is movable in an up-down direction relative to the supporting member 13, and the test fixture 100 further includes a first positioning member (not shown) penetrating through the supporting member 13 and connected to the top plate 11 so as to position the top plate 11, and a second positioning member (not shown) penetrating through the supporting member 13 and connected to the bottom plate 12 so as to position the bottom plate 12. Specifically, as shown in fig. 1 to 3, the upper end portion of the supporting member 13 and the lower end portion of the supporting member 13 are both provided with external threads, the top plate 11 is provided with a first hole penetrating the top plate 11 thereof in the up-down direction, the bottom plate 12 is provided with a second hole penetrating the bottom plate 12 thereof in the up-down direction, the upper end portion of the supporting member 13 is penetrated in the first hole, the first positioning member and the second positioning member are both nuts, the top plate 11 is screwed on the upper end portion of the supporting member 13 by the first positioning member, the lower end portion of the supporting member 13 is penetrated in the second hole and the bottom plate 12 is screwed on the lower end portion of the supporting member 13 by the first positioning member, thereby the heights of the top plate 11 and the bottom plate 12 can be adjusted according to the actual situation, for example: when the lower end of the expansion part 32 passes through the mounting hole 21, in order to enable the mounting member 2 to continuously load the superconducting bridge joint 9, the bottom plate 12 can be enabled to move upwards, so that the whole test fixture 100 is driven to move upwards, the expansion part 32 is prevented from interfering with the ground through the first through hole 121 of the bottom plate 12, and the testing capability of the test fixture 100 is improved.
In some embodiments, the projection of the first through hole 121 is polygonal, elliptical, or the like in a projection plane orthogonal to the up-down direction. Specifically, the inner peripheral contour of the first through hole 121 and the outer peripheral contour shape of the mounting groove are each shaped non-circular, for example: the inner peripheral contour of the first through hole 121 and the outer peripheral contour shape of the mounting groove are each rectangular, pentagonal, elliptical, triangular, etc., thereby making it possible to secure the mounting member 2 from rotating within the first through hole 121 while expanding.
In some embodiments, the dimension of the mount 2 in the up-down direction is smaller than the dimension of the expansion portion 32 in the up-down direction. Specifically, as shown in fig. 1-3, the height of the mounting member 2 is smaller than the height of the expansion portion 32, so that when the expansion portion 32 moves in the mounting hole 21, the expansion portion 32 fills the mounting hole 21, and the expansion force applied to the mounting member 2 is ensured, so that the expansion portion 32 is more reasonably arranged.
Preferably, the dimension of the mount 2 in the up-down direction is smaller than 2 times the dimension of the expansion portion 32 in the up-down direction.
In some embodiments, the dimension of the mounting member 2 in the up-down direction may be set according to the actual situation, for example: the dimension of the mounting piece 2 in the up-down direction is equal to the dimension of the superconducting bridge joint 9 in the up-down direction, so that the superconducting bridge joint 9 can be fully loaded, or the dimension of the mounting piece 2 in the up-down direction is smaller than the dimension of the superconducting bridge joint 9 in the up-down direction, the whole expansion or partial expansion of the superconducting bridge joint 7 in the width direction (up-down direction as shown in fig. 1) is realized, the superconducting bridge joint 9 can be partially loaded, and the application range of the test tool 100 is improved.
According to the tensile strength testing method of the superconducting bridge joint 9 of the embodiment of the present invention, the testing tool 100 using any one of the above embodiments includes:
s1: the superconducting bridge joint 9 includes a first single tape 91, a second single tape 92, and a bridge tape 93, the end portion of the first single tape 91 is bent to form a first circular ring 911, the end portion of the second single tape 92 is bent to form a second circular ring 921, the center line of the first circular ring 911 and the center line of the second circular ring 921 coincide, and the first circular ring 911 and the second circular ring 921 are sequentially arranged, and the bridge tape is welded in the first circular ring 911 and the second circular ring 921. Specifically, as shown in fig. 4 and 5, the first single band 91 and the second single band 92 are both high-temperature superconductive single bands, the bridge band 93 is a high-temperature superconductive bridge band 93, one end of the first single band 91 is bent to form a first circular ring 911 and one end of the second single band 92 is bent to form a second circular ring 921, an inner circumferential surface of the first circular ring 911 and an inner circumferential surface of the second circular ring 921 are respectively connected with the superconductive surfaces of the bridge band 93 by brazing, a welding area of the superconductive bridge joint 9 may be smaller than a semicircle, the other end of the first single band 91 may be connected with the first current terminal 4, and the other end of the second single band 92 may be connected with the second current terminal 5.
A part of the first single tape 91 is wound around the outer peripheral surface of the first ring 911 and soldered thereto, and a part of the second single tape 92 is wound around the outer peripheral surface of the second ring 921 and soldered thereto. Specifically, as shown in fig. 3, a part of the first single tape 91 is wound around the outer circumferential surface of the first ring 911 and a part of the first single tape 91 is wound around the outer circumferential surface of the first ring 911 with a welding point 94 therebetween, a part of the second single tape 92 is wound around the outer circumferential surface of the second ring 921 and a part of the second single tape 92 is wound around the outer circumferential surface of the second ring 921 with a welding point 94 therebetween, and the welding point 94 can be soldered by solder so that the first ring 911 and the second ring 921 are closed, an effective application of tension when expanding the first ring 911 and the second ring 921 can be realized, the problem that the test means in the related art can only test a joint with a welding area smaller than a semicircle is solved, and the test length of the superconducting bridge joint 9 is improved.
S2: according to the testing condition of the superconducting bridge joint 9, the mounting pieces 2 of the testing tool 100 with different sizes are selected, so that the first circular ring 911 is sleeved on the outer circumferential side of the mounting piece 2 of the testing tool 100, or the second circular ring 921 is sleeved on the outer circumferential side of the mounting piece 2 of the testing tool 100, or the first circular ring 911 and the second circular ring 912 are sleeved on the outer circumferential side of the mounting piece 2 of the testing tool 100. Therefore, according to the practical situation, the installation members with different widths (as shown in fig. 1, the dimension of the installation members in the up-down direction) can be selected, when the superconducting bridge joint 9 is partially loaded, the width dimension of the installation member 2 is equal to the width of the first circular ring 911 or the width of the second circular ring 921, one of the first circular ring 911 and the second circular ring 921 can be sleeved on the outer circumferential side of the installation member 2, when the superconducting bridge joint 9 is fully loaded, the width dimension of the installation member 2 is equal to the sum of the width of the first circular ring 911 and the width of the second circular ring 921, and both the first circular ring 911 and the second circular ring 921 can be sleeved on the outer circumferential side of the installation member 2 to load the first circular ring 911 and the second circular ring 921.
S3: the driving member 3 of the test fixture 100 is driven so that the driving member 3 drives the mounting member 2 to expand outwards along the inner and outer directions, so that the first circular ring 911 and the second circular ring 921 are subjected to the acting force of outwards expanding. Thereby, the driving member 3 is driven to subject the superconducting bridge joint 9 to an expansion force outward in the inner and outer directions.
S4: strain gages 10 are arranged at both ends of the welding region of the superconducting bridge joint 9 so as to detect tensile strain to which the first ring 911 and the second ring 921 are subjected. Specifically, as shown in fig. 4 and 5, the strain gauge 10 is mainly disposed at the welding region start position of the first single band 91 and the bridge band 93 and at the welding region start position of the second single band 92 and the bridge band 93, the strain gauge 10 is plural, one part of the plurality of strain gauges 10 is disposed at the welding region start position of the first single band 91 and the bridge band 93 and is located at the outer peripheral side of the first single band 91, one part of the plurality of strain gauges 10 is disposed at the welding region start position of the second single band 92 and the bridge band 93 at intervals in the up-down direction, and another part of the plurality of strain gauges 10 is disposed at the outer peripheral side of the second single band 92 at intervals in the up-down direction to monitor whether or not there is a phenomenon of stress concentration in the width direction of the superconducting bridge joint 9 at the time of expansion stretching.
The tensile strength testing method provided by the embodiment of the invention has the advantages of simple steps, accurate testing results and the like.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. Tensile strength test fixture of superconductive bridge joint, its characterized in that includes:
a mounting frame;
a mounting member having elastic deformation, the mounting member being provided in the mounting frame and having a mounting hole penetrating the mounting member in an up-down direction, an outer circumferential surface of the mounting member being adapted to mount a superconducting bridge joint;
the driving piece, the driving piece has drive division and expansion portion, drive division wears to establish on the mounting bracket and for the mounting bracket is along upper and lower direction movable, the expansion portion is established the lower extreme of drive division just the cross-sectional area of expansion portion reduces from the top down gradually, at least part of expansion portion wears to establish in the mounting hole of mounting piece, so that the expansion portion drive the mounting piece is outwards expanded along inside and outside direction so that the superconductive bridging joint receives the stress of outwards expanding.
2. The tool for testing the tensile strength of the superconducting bridge joint according to claim 1, wherein the cross-sectional area of the inner peripheral surface of the mounting hole gradually decreases from top to bottom and is matched with the outer peripheral surface of the expansion portion, and the cross-sectional area of the outer peripheral surface of the mounting member is constant from top to bottom.
3. The tool according to claim 1, wherein the dimension of the mounting member in the up-down direction is smaller than the dimension of the expansion portion in the up-down direction.
4. The tensile strength testing tool of a superconducting bridge joint according to claim 1, further comprising:
the first current terminal is arranged on the mounting frame and is suitable for being electrically connected with one end of the superconducting bridge joint;
and the second current terminal is arranged on the mounting frame and is suitable for being electrically connected with the other end of the superconducting bridge joint so that the first current terminal and the second current terminal electrify the superconducting bridge joint.
5. The tool for testing the tensile strength of the superconducting bridge joint according to claim 4, further comprising a first compression block and a second compression block, wherein the first compression block is arranged on the first current terminal through a fastener, one end of the superconducting bridge joint is arranged between the first compression block and the first current terminal, so that the superconducting bridge joint is arranged on the first current terminal,
the second compression block is arranged on the second current terminal through a fastener, and the other end of the superconducting bridge joint is arranged between the second compression block and the second current terminal, so that the superconducting bridge joint is arranged on the second current terminal.
6. The tool according to claim 1, wherein the mounting frame comprises a top plate, a bottom plate and a supporting member, the supporting member extends in an up-down direction, the top plate and the bottom plate are arranged on the supporting member at intervals in the up-down direction, the mounting member is arranged on the bottom plate, and the driving portion is arranged on the top plate in a penetrating manner and is movable relative to the top plate in the up-down direction.
7. The tool according to claim 6, wherein the top plate is movable in an up-down direction with respect to the support, the bottom plate is movable in an up-down direction with respect to the support,
the test fixture further comprises a first locating piece and a second locating piece, wherein the first locating piece is arranged on the supporting piece in a penetrating mode and is connected with the top plate in a penetrating mode so as to locate the top plate, and the second locating piece is arranged on the supporting piece in a penetrating mode and is connected with the bottom plate in a penetrating mode so as to locate the bottom plate.
8. The tool for testing the tensile strength of the superconducting bridge joint according to claim 6, further comprising:
the first positioning part is arranged on the upper end surface of the bottom plate, and is provided with a first through hole penetrating through the first positioning part;
the second positioning part is arranged on the outer peripheral side of the mounting piece, a limiting groove extending along the circumferential direction of the mounting piece is formed in the lower end face of the second positioning part, the second positioning part is arranged on the first positioning part, the upper end face of the first positioning part abuts against the lower end face of the limiting groove, and at least part of the expansion part penetrates through the mounting piece and is located in the first through hole.
9. The tool for testing the tensile strength of the superconducting bridge joint according to claim 5, wherein the driving part extends in the up-down direction and is provided with external threads on the outer circumferential surface thereof, the top plate of the mounting frame is provided with a threaded through hole penetrating the top plate in the up-down direction, the driving part is penetrated in the threaded through hole and the external threads are matched with the threaded through hole so that the driving part moves in the up-down direction,
the testing tool further comprises an end cover, the end cover is arranged at the top of the expansion part, a second through hole penetrating through the end cover along the up-down direction is formed in the end cover, the lower end part of the driving part penetrates through the second through hole and is rotatably arranged in the end cover in a penetrating mode, so that the driving part drives the expansion part to move in the up-down direction, and the projection of the second through hole is located in the projection of the lower end part of the driving part in a projection plane orthogonal to the up-down direction.
10. A method of testing the tensile strength of a superconducting bridge joint using the test fixture of any one of claims 1-9, comprising:
s1: the superconducting bridge joint comprises a first single belt, a second single belt and a bridging belt, wherein the end part of the first single belt is bent to form a first circular ring, the end part of the second single belt is bent to form a second circular ring, the central line of the first circular ring and the central line of the second circular ring are overlapped, the first circular ring and the second circular ring are sequentially arranged along the thickness direction of the first circular ring, the bridging belt is welded in the first circular ring and the second circular ring,
winding a part of the first single band around the outer peripheral surface of the first circular ring and welding the first single band by soldering tin, and winding a part of the second single band around the outer peripheral surface of the second circular ring and welding the second single band by soldering tin;
s2: selecting the mounting parts of the test tools with different sizes according to the loading condition of the superconducting bridge joint, so as to sleeve the first circular ring on the outer circumferential side of the mounting part of the test tool, or sleeve the second circular ring on the outer circumferential side of the mounting part of the test tool, or sleeve the first circular ring and the second circular ring on the outer circumferential side of the mounting part of the test tool;
s3: the driving piece of the test tool is driven to drive the mounting piece to expand outwards along the inner and outer directions, so that the first circular ring and the second circular ring are subjected to outward expansion stress;
s4: strain gages are arranged at both ends of the welding area of the bridge strap so as to detect tensile strain to which the first ring and the second ring are subjected.
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