CN103674681A - Steel strand mechanical testing device in ultra-low-temperature environment and testing method thereof - Google Patents
Steel strand mechanical testing device in ultra-low-temperature environment and testing method thereof Download PDFInfo
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- CN103674681A CN103674681A CN201310673935.1A CN201310673935A CN103674681A CN 103674681 A CN103674681 A CN 103674681A CN 201310673935 A CN201310673935 A CN 201310673935A CN 103674681 A CN103674681 A CN 103674681A
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Abstract
The invention discloses a steel strand mechanical testing device in an ultra-low-temperature environment and a testing method thereof. The device comprises a universal testing machine and a low-temperature box arranged between an upper jaw and a lower jaw of the universal testing machine; through holes which are opposite to each other and are used for the passing of a connecting component connected with a tested steel strand are respectively formed in the upper surface and the lower surface of the low-temperature box; the connecting component is connected with the two ends of the tested steel strand and consists of a force transfer rod, a connection self-locking component and a self-locking clamp head. According to the steel strand mechanical testing device in the ultra-low-temperature environment and the testing method thereof, the aim of completely arranging the tested steel strand in the low-temperature box is fulfilled by utilizing the connecting component for the tested steel strand; the temperature of the steel strand is distributed uniformly; mechanical parameters can be tested accurately; the test accuracy is improved, wherein the connecting component comprises the connection self-locking component, the self-locking clamp head and the force transfer rod, so that the overall device is simple in structure, easy to machine and convenient to detach and can be reused; moreover, the testing method is simple and is convenient to operate; the test accuracy is improved, and the test efficiency is guaranteed, and therefore, the device and the method can be widely applied to steel strand mechanical tests.
Description
Technical field
The present invention relates to a kind of steel strand wires mechanical testing equipment and test method thereof.
Background technology
In low temperature civil engineering work, prestressing technique is existing application in xoncrete structure.Wherein, steel strand wires, as the mechanics performance change situation under low temperature environment of most important member in prestressing technique, have vital impact to whole prestress system.Therefore to steel strand wires used, mechanical property research of low temperature and ultra-low temperature surroundings, be, necessary.
At present, Chinese scholars has proposed three kinds of feasible programs for studying reinforcing bar in the mechanical property of low temperature or ultra-low temperature surroundings: 1, tested reinforcing bar is placed in to low temperature environment and lowers the temperature, then with universal testing machine, carry out mechanical test at normal temperatures; 2, tested reinforcing bar is direct and universal testing machine fixture is fixed.In process of the test, tested reinforcing bar middle part is placed in low temperature environment, makes it when mechanical test, can remain target temperature, but the reinforcing bar two ends of close universal testing machine fixture are still in normal temperature, destroy and more easily occur in this temperature boundary; 3, tested reinforcing bar is fixed in the mode being threaded with special fixture one end, reinforcing bar is placed in to cryogenic box completely and carries out low-temperature test.
But said method is not all suitable for the low-temperature test of steel strand wires, and subject matter appears at: first two method at the trial part or whole sample can be in normal temperature, the situation that this there will be temperature distributing disproportionation, causes surveyed test figure to have deviation; The third method need to be carried out mantle fiber processing to reinforcing bar, but is difficult to steel strand wires to carry out this processing, so and be not suitable for.
Summary of the invention
The object of this invention is to provide steel strand wires mechanical testing equipment and test method thereof under a kind of ultra-low temperature surroundings, solve the technical matters of carrying out steel strand wires mechanical test under ultra-low temperature surroundings; And solve the problem of warranty test quality and efficiency.
For achieving the above object, the present invention adopts following technical scheme:
Steel strand wires mechanical testing equipment under a kind of ultra-low temperature surroundings, comprise universal testing machine and be placed in the cryogenic box between the bit of omnipotent test, the through hole that the upper and lower surface of described cryogenic box respectively has a mutual correspondence, passes for connecting the coupling assembling of tested steel strand wires, described coupling assembling is connected to the two ends of tested steel strand wires and is comprised of transmission rod, connection self-locking body and self-locking chuck.
One end of described transmission rod is passed, by the jaw of universal testing machine, is fixed by the through hole of cryogenic box, the other end be connected self-locking body and connect, in described connection self-locking body, be built-in with self-locking chuck, described self-locking clip head-clamp is held in the termination of tested steel strand wires.
Described connection self-locking body is cylinder-like structure, and the top of its inner chamber is to establish female thread segment, the self-locking section that bottom is back taper, and middle part is level and smooth transition section.
Described self-locking chuck is comprised of two symmetrical intermediate plates, and the chuck that two intermediate plates piece together back taper is stuck in the self-locking section of self-lock connecting piece, and the surface of contact of described self-locking chuck and self-locking section is shiny surface.
The center of the medial surface of described intermediate plate, in the vertical direction have the groove that the tested steel strand wires of one clamping are used.
The xsect of described groove is semicircle, and the surface of contact of groove and tested steel strand wires is uneven surface.
Described transmission rod is threaded connection with being connected self-locking body, and there is the external thread being used in conjunction with the thread segment that is connected self-locking body the termination of transmission rod.
Described cryogenic box comprises casing and case lid, and box house is provided with fan, temperature sensor and vent port.
A test method of applying steel strand wires mechanical testing equipment under described ultra-low temperature surroundings, concrete steps are as follows:
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention has overcome in conventional steel twisted wire mechanical test that sample temperature distributing disproportionation is even, the coarse shortcoming of result, has solved the technical matters that improves test accuracy and convenience.
The present invention is by utilizing tested steel strand wires coupling assembling to realize the object that tested steel strand wires is placed in completely to cryogenic box, can realize the experimental enviroment that normal temperature arrives-196 ℃, wherein normal temperature is generally the temperature range of 15 ℃ to 25 ℃, guaranteed that in process of the test, the residing temperature environment of steel strand wires is unanimously average, it is uniformity of temperature profile on steel strand wires, so that accurate test force mathematic(al) parameter, improved the accuracy of test, wherein coupling assembling comprises connection self-locking body, self-locking chuck and transmission rod three parts, whole apparatus structure is simple, easily processing, for convenience detach, can reuse, and intensity is large, can bear the load of 2000KN: the thread segment that connects self-locking body is in order to be threaded with transmission rod, connect so more firm, reliably, to connect transition section on self-locking body and be in order preventing from inserting transmission rod with self-locking chuck and contact, make the freely activity and reserve activity space out of self-locking chuck, avoid affecting the clamping of self-locking chuck to tested steel strand wires, the self-locking section of self-lock connecting piece is the taper coordinating with self-locking chuck, both circular arc smooth contact surfaces, be easy to make self-locking chuck under the snap-in force of steel strand wires drives, slippage freely, self-locking clip head-clamp is held in the two ends of tested steel strand wires, because tested steel strand wires can not carry out screw thread processing, so self-locking chuck adopt intermediate plate clamping fixed form, and steel strand wires are be screwed in together, have each other contact but do not fixed by fine steel rib, therefore the groove that clamps steel strand wires is chosen as semicircle, and whole jaws is circular, makes like this steel strand wires surrounding be subject to uniform holding force, guarantee when testing, be firmly connected with tested steel strand wires, the other end of transmission rod passes cryogenic box, and fix by the jaw of omnipotent mechanical test machine, this coupling assembling to the size and dimension of tested steel strand wires without particular requirement, by changing the self-locking chuck of corresponding size, can carry out mechanical test to the steel strand wires of different size, and test method is simple, easy to operate, improve test degree of accuracy, guaranteed test efficiency.
The present invention can be widely used in steel strand wires mechanical test.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is the structural representation of test unit of the present invention.
Fig. 2 is the cross-sectional view of connection self-locking body of the present invention.
Fig. 3 is the plan structure schematic diagram of connection self-locking body of the present invention.
Fig. 4 is the main TV structure schematic diagram of self-locking chuck of the present invention.
Fig. 5 is the cross-sectional view of self-locking chuck of the present invention.
Fig. 6 is the plan structure schematic diagram of self-locking chuck of the present invention.
Fig. 7 is the structural representation of transmission rod of the present invention.
Fig. 8 is the annexation schematic diagram of cryogenic box of the present invention and relevant device thereof.
The tested steel strand wires of Reference numeral: 1-, 2-connect self-locking body, 2.1-thread segment, 2.2-transition section, 2.3-self-locking section, 3-self-locking chuck, 3.1-intermediate plate, 3.11-groove, 4-transmission rod, 5-cryogenic box, 5.1-casing, 5.11-fan, 5.12-temperature sensor, 5.13-vent port, 5.2-case lid, 6-jaw, 7-universal testing machine, 8-liquid nitrogen container, 9-solenoid valve, 10-controller, 11-data terminal.
Embodiment
Embodiment is shown in Figure 1, steel strand wires mechanical testing equipment under this ultra-low temperature surroundings, comprise universal testing machine 7 and be placed in the cryogenic box 5 between the bit of omnipotent test 7, it is characterized in that: the upper and lower surface of described cryogenic box 5 respectively has a correspondence mutually, the through hole 5.14 passing for connecting the coupling assembling of tested steel strand wires, described coupling assembling is connected to the two ends of tested steel strand wires and by transmission rod 4, connect self-locking body 2 and self-locking chuck 3 compositions, one end of described transmission rod 4 is passed by the through hole 5.14 of cryogenic box 5, jaw 6 by universal testing machine is fixing, the other end be connected self-locking body 2 and connect, in described connection self-locking body 2, be built-in with self-locking chuck 3, described self-locking chuck 3 is clamped in the termination of tested steel strand wires 1.
Shown in Fig. 2, Fig. 3, described connection self-locking body 2 is cylinder-like structure, the top of its inner chamber is to establish female thread segment 2.1, bottom is the self-locking section 2.3 of back taper, middle part is level and smooth transition section 2.2, wherein transition section 2.2 is free activity spaces of the self-locking chuck 3 that reserves in order while to prevent from being connected with transmission rod 4 contact with self-locking chuck 3, guarantees the clamping of 3 pairs of tested steel strand wires of self-locking chuck; Self-locking section 2.3 and the self-locking chuck 3 of back taper agrees with and both surface of contact are smooth circular arc, guarantee that self-locking chuck 3 is under the snap-in force of steel strand wires drives, slippage freely, slippage more down, holding force is larger, so be called self-locking chuck, just guaranteed that tested steel strand wires can slippage in process of the test.
Referring to Fig. 4, Fig. 5, shown in Fig. 6, described self-locking chuck 3 is comprised of two symmetrical intermediate plates 3.1, the chuck that two intermediate plates 3.1 piece together back taper is stuck in the self-locking section 2.3 of self-lock connecting piece 2, described self-locking chuck 3 is shiny surface with the surface of contact of self-locking section 2.3, the center of the medial surface of described intermediate plate 3.1, in the vertical direction has the groove 3.11 of tested steel strand wires 1 use of one clamping, the xsect of described groove 3.11 is semicircle, after two mutual amalgamations of intermediate plate, two grooves 3.11 are also combined into complete circular jaws thereupon, groove 3.11 is uneven surface with the surface of contact of tested steel strand wires 1.
Shown in Figure 7, described transmission rod 4 is threaded connection with being connected self-locking body 2, and there is the external thread being used in conjunction with the thread segment 2.1 that is connected self-locking body 2 termination of transmission rod 4.
Shown in Figure 8, described cryogenic box 5 comprises casing 5.1 and case lid 5.2, casing 5.1 inside are provided with fan 5.11, temperature sensor 5.12 and vent port 5.13, described cryogenic box 5 is connected with for reducing the liquid nitrogen container 8 of temperature, the solenoid valve 9 that has its regulating action between cryogenic box 5 and liquid nitrogen container, described solenoid valve 9 is connected, by controller 10, is regulated and controled with controller 10, described controller 10 is connected with the temperature sensor 5.12 on data terminal 11 and cryogenic box, and the temperature in can Real-Time Monitoring process of the test is also carried out data transmission.
A test method of applying steel strand wires mechanical testing equipment under described ultra-low temperature surroundings, concrete steps are as follows:
Claims (8)
1. steel strand wires mechanical testing equipment under a ultra-low temperature surroundings, comprise universal testing machine (7) and be placed in the cryogenic box (5) between the bit of omnipotent test (7), it is characterized in that: the through hole (5.14) that the upper and lower surface of described cryogenic box (5) respectively has a mutual correspondence, passes for connecting the coupling assembling of tested steel strand wires, described coupling assembling is connected to the two ends of tested steel strand wires and is comprised of transmission rod (4), connection self-locking body (2) and self-locking chuck (3);
One end of described transmission rod (4) is passed, by the jaw (6) of universal testing machine, is fixed by the through hole (5.14) of cryogenic box (5), the other end be connected self-locking body (2) and connect, in described connection self-locking body (2), be built-in with self-locking chuck (3), described self-locking chuck (3) is clamped in the termination of tested steel strand wires (1).
2. steel strand wires mechanical testing equipment under ultra-low temperature surroundings according to claim 1, it is characterized in that: described connection self-locking body (2) is cylinder-like structure, the top of its inner chamber is to establish female thread segment (2.1), bottom is the self-locking section (2.3) of back taper, and middle part is level and smooth transition section (2.2).
3. steel strand wires mechanical testing equipment under ultra-low temperature surroundings according to claim 2, it is characterized in that: described self-locking chuck (3) is comprised of two symmetrical intermediate plates (3.1), the chuck that two intermediate plates (3.1) piece together back taper is stuck in the self-locking section (2.3) of self-lock connecting piece (2), and described self-locking chuck (3) is shiny surface with the surface of contact of self-locking section (2.3).
4. steel strand wires mechanical testing equipment under ultra-low temperature surroundings according to claim 3, is characterized in that: center, the in the vertical direction of the medial surface of described intermediate plate (3.1) has the groove (3.11) of the tested steel strand wires of one clamping (1) use.
5. steel strand wires mechanical testing equipment under ultra-low temperature surroundings according to claim 4, is characterized in that: the xsect of described groove (3.11) is for semicircle, and groove (3.11) is uneven surface with the surface of contact of tested steel strand wires (1).
6. according to steel strand wires mechanical testing equipment under the ultra-low temperature surroundings described in claim 2 or 4 or 5, it is characterized in that: described transmission rod (4) is threaded connection with being connected self-locking body (2), and there is the external thread being used in conjunction with the thread segment that is connected self-locking body (2) (2.1) termination of transmission rod (4).
7. steel strand wires mechanical testing equipment under ultra-low temperature surroundings according to claim 6, it is characterized in that: described cryogenic box (5) comprises casing (5.1) and case lid (5.2), casing (5.1) inside is provided with fan (5.11), temperature sensor (5.12) and vent port (5.13).
8. application rights requires a test method for steel strand wires mechanical testing equipment under the described ultra-low temperature surroundings of one of 1-7, it is characterized in that: concrete steps are as follows:
Step 1, by two pairs of intermediate plates (3.1) respectively corresponding amalgamation be self-locking chuck (3) and put into two and connect self-locking body (2 self-locking sections (2.3);
Step 2, penetrates the two ends of tested steel strand wires 1 respectively in the self-locking section (2.3) of two connection self-locking bodies (2), and grips by self-locking chuck 3;
Step 3, connects one end of transmission rod (4) with the thread segment (2.1) that is connected self-locking body (2);
Step 4, the upper lower through-hole (5.14) by the other end of transmission rod (4) by cryogenic box (5) passes, and fixing by the jaw (6) of universal testing machine;
Step 5, covers cryogenic box case lid, starts cryogenic box, at normal temperature, arrives-190 ℃ of range regulation test temperatures;
Step 6, after temperature stabilization to be tested, starts universal testing machine, carries out steel strand wires mechanical test, and records test figure.
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Cited By (11)
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| CN104032722A (en) * | 2014-06-18 | 2014-09-10 | 广东省水利电力勘测设计研究院 | Soil strength detection sensor |
| CN104034579A (en) * | 2014-06-18 | 2014-09-10 | 马钢(集团)控股有限公司 | Self-locking clamp suitable for ultralow-temperature steel bar tension test and using method of clamp |
| CN104122141A (en) * | 2014-07-14 | 2014-10-29 | 宝钢集团南通线材制品有限公司 | A detection method of the fatigue lifetime of a high-strength hot dipped galvanized steel wire used for a bridge cable |
| CN104849145A (en) * | 2015-06-03 | 2015-08-19 | 贵州省交通规划勘察设计研究院股份有限公司 | Rod piece load holding testing device |
| CN104865136A (en) * | 2015-05-21 | 2015-08-26 | 天津大学 | Testing device for strain measurement of steel strand at ultralow temperature |
| CN106525573A (en) * | 2016-12-12 | 2017-03-22 | 兰州大学 | Self-adaptive clamp for superconductive multi-strand wire |
| CN106840865A (en) * | 2017-03-27 | 2017-06-13 | 北方民族大学 | A kind of fixture and cupping machine |
| CN111189717A (en) * | 2020-01-16 | 2020-05-22 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
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| WO2024114081A1 (en) * | 2022-11-28 | 2024-06-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Thermal test apparatus and test method for hybrid connection structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104032722A (en) * | 2014-06-18 | 2014-09-10 | 广东省水利电力勘测设计研究院 | Soil strength detection sensor |
| CN104034579A (en) * | 2014-06-18 | 2014-09-10 | 马钢(集团)控股有限公司 | Self-locking clamp suitable for ultralow-temperature steel bar tension test and using method of clamp |
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| CN104122141A (en) * | 2014-07-14 | 2014-10-29 | 宝钢集团南通线材制品有限公司 | A detection method of the fatigue lifetime of a high-strength hot dipped galvanized steel wire used for a bridge cable |
| CN104122141B (en) * | 2014-07-14 | 2016-08-31 | 宝钢集团南通线材制品有限公司 | The bridge cable detection method of high-strength hot-dip zinc-coated steel wire fatigue life |
| CN104865136A (en) * | 2015-05-21 | 2015-08-26 | 天津大学 | Testing device for strain measurement of steel strand at ultralow temperature |
| CN104849145A (en) * | 2015-06-03 | 2015-08-19 | 贵州省交通规划勘察设计研究院股份有限公司 | Rod piece load holding testing device |
| CN106525573A (en) * | 2016-12-12 | 2017-03-22 | 兰州大学 | Self-adaptive clamp for superconductive multi-strand wire |
| CN106840865A (en) * | 2017-03-27 | 2017-06-13 | 北方民族大学 | A kind of fixture and cupping machine |
| CN106840865B (en) * | 2017-03-27 | 2023-09-12 | 北方民族大学 | Clamp and tensile testing machine |
| CN111189717A (en) * | 2020-01-16 | 2020-05-22 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
| CN111189717B (en) * | 2020-01-16 | 2022-11-15 | 重庆大学 | Material and structure biaxial loading mechanical property test system in ultralow temperature environment |
| WO2024114081A1 (en) * | 2022-11-28 | 2024-06-06 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | Thermal test apparatus and test method for hybrid connection structure |
| CN116907716A (en) * | 2023-09-13 | 2023-10-20 | 国科大杭州高等研究院 | Thermal noise suppression based torsion pendulum type micro-thrust measuring device and method |
| CN116907716B (en) * | 2023-09-13 | 2024-01-26 | 国科大杭州高等研究院 | Thermal noise suppression based torsion pendulum type micro-thrust measuring device and method |
| CN117169100A (en) * | 2023-11-03 | 2023-12-05 | 南通景康橡塑有限公司 | Finished product performance detection equipment and detection method thereof |
| CN117169100B (en) * | 2023-11-03 | 2024-04-12 | 南通景康橡塑有限公司 | Finished product performance detection equipment and detection method thereof |
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Application publication date: 20140326 |