CN103091176A - Testing device for testing mechanical property of steel bar under ultralow temperature environment - Google Patents
Testing device for testing mechanical property of steel bar under ultralow temperature environment Download PDFInfo
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- CN103091176A CN103091176A CN2012104830958A CN201210483095A CN103091176A CN 103091176 A CN103091176 A CN 103091176A CN 2012104830958 A CN2012104830958 A CN 2012104830958A CN 201210483095 A CN201210483095 A CN 201210483095A CN 103091176 A CN103091176 A CN 103091176A
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Abstract
The invention relates to a testing device for testing a mechanical property of a steel bar under an ultralow temperature environment. The testing device comprises a universal tensile testing machine, a suspended track type trolley, an ultralow temperature testing box, a liquid nitrogen tank, an electric control cabinet and an external measuring device, wherein the suspended track type trolley is suspended on the upper end of the universal tensile testing machine; the ultralow temperature testing box is placed on the suspended track type trolley; the liquid nitrogen tank is connected with a controller on the ultralow temperature testing box through a liquid nitrogen pipe; the electric control cabinet is connected with the controller on the ultralow temperature testing box through an electric control wire; and the external measuring device is connected with an external connector lug on the ultralow temperature testing box through a connecting wire so as to read data measured by an internal measuring device. According to the testing device, the testing box and the suspended track type trolley are independent mutually, so that rapid positioning in follow-up testing is facilitated and the operation cycle is shortened; sealing plugs at the two ends of the testing box are fixed in a combination manner of front-blocking and post-tensioning, so that over-large extrusion force on the steel bar, which is generated by the over-large displacement of the sealing plugs and affects test results, is avoided; and an upper cover of the testing box and the lower part of a box body are further sealed by groove-and-tongue connection.
Description
Technical field
The invention belongs to the testing of materials field, particularly, relate to steel bar mechanics performance test unit under a kind of ultra-low temperature surroundings, particularly relate to a kind of tensile property test and the stress relaxation of ultralow temperature lower prestress reinforcing bar and test unit of the stress loss test that produces for splice under the tension test of reinforcing bar static(al), ultralow temperature under ultralow temperature.
Background technology
Ultralow temperature storage tank (as LNG tank) is China's unique construction of beginning to build in recent years.The outer tank skin of storage tank generally adopts prestressed reinforced concrete construction, the temperature of liquefied natural gas (LNG) storage is-165 ℃ of left and right, when interior filling is leaked, outer tank can be subjected to the temperature load of compressive load and-165 ℃, and under low temperature, the performance of reinforcing bar also can change, and then affect the overall performance of reinforced concrete.
At present, the design of large-scale ultralow temperature storage tank only rests in a few countries hands such as Great Britain and America's day, China also is in starting and exploratory stage, relevant standard criterion is not still caught up with the paces of construction, remains progressively to set up and improve on the basis of digesting and assimilating advanced foreign technology standard and domestic development Construction Practice and research related specifications and the standard of our country oneself of a cover.
Domestic research for ultralow temperature (below 100 ℃) reinforcement property is less, the clear grade of the Wang Yuan of Tsing-Hua University done campaign to BCT3c ∏ (being equivalent to China Q235), O9 Γ 2C (being equivalent to China Q345) and three kinds of steel of hot quenched and tempered steel BCT3c ∏-T2 respectively at 20 ℃ ,-20 ℃ ,-60 ℃ three temperature spots, the static(al) tension test of reinforcing bar under ultralow temperature was done by Tongji University and University Of Tianjin, but be limited to test condition, the test exist error and conclusion sufficiently complete.Therefore, also need do lot of experiments and require to test more accurate in related specifications and the standard in this field for improving China.
For the performance of reinforcing bar under ultralow temperature, external experimental study has had certain basis, and we are had reference, but external test findings can not directly be used in China simply.Therefore, the performance of reinforcing bar under ultra-low temperature surroundings remains further further investigation, to setting up a cover than more complete China standards system independently.
Correlative study was not also done in domestic stress loss test for ultralow temperature lower prestress reinforcing bar, and the stress loss of ultralow temperature lower prestress reinforcing bar is most important for the design of ultralow temperature storage tank.
Summary of the invention
For overcoming the existing equipment deficiency, the invention provides a kind of easy to operate and can complete accurately and quickly under ultralow temperature the test unit of the stress loss test that the tensile property of splice test under the tension test of reinforcing bar static(al), ultralow temperature and ultralow temperature lower prestress reinforcing bar produce due to stress relaxation.
For achieving the above object, the present invention adopts following scheme:
Steel bar mechanics performance tester for testing under ultra-low temperature surroundings comprises universal tensile testing machine, suspended rail formula dolly, cryogenic testing case, liquid nitrogen container, electric cabinet and external measurement devices; Suspended rail formula dolly hangs on the universal tensile testing machine upper end, the cryogenic testing case is positioned on suspended rail formula dolly, liquid nitrogen container is connected with controller on the cryogenic testing case by liquid nitrogen pipe, electric cabinet is connected with controller on the cryogenic testing case by electrical control lines, and external measurement devices is connected and then reads the data that internal measurement equipment records with external the end of a thread on the cryogenic testing case by connecting line.
Preferably, above-mentioned suspended rail formula dolly comprises dolly and two suspended rails, and two suspended rails are parallel; Every suspended rail comprises crossbeam, ground tackle, extension type suspending rod, vertical brace, horizontal brace and track; The ground tackle of crossbeam by two ends is fixed on the universal tensile testing machine upper end, and with ground tackle and the crossbeam anchoring is tight forms an integral body, the set bolt on ground tackle and then the integral body that will form and universal tensile testing machine upper end are fixed by coupling bolt.
Preferably, crossbeam two ends are hung with respectively the extension type suspending rod, and crossbeam and extension type suspending rod can be fixed with bolts; Four extension type suspending rod are respectively equipped with on both direction intersects horizontal brace with vertically brace is to strengthen structural integrity, and laterally brace and vertical brace and extension type suspending rod are fixed with bolts.
Preferably, the extension type suspending rod consists of by the different steel pipe of two diameters is nested, minor-diameter steel-tube stretches in large diameter steel pipe, and the Large-diameter Steel tube wall is embedded with fastening bolt, fastening bolt is tightened the extruding minor-diameter steel-tube when the Large-diameter Steel inner telescoping tube reaches desired height when minor-diameter steel-tube.
Preferably, dolly comprises little car bottom plate, four wheels and four rigid bars, two wheels are arranged in every track, each wheel is connected with four angles of little car bottom plate by a rigid rod, wheel can free in and out track and slide in track, and rigid bar and little car bottom plate are fixed with bolts.Little car bottom plate has certain rigidity and intensity and centre and boxes out.
Preferably, little car bottom plate is selected steel plate or scale board.
Preferably, the cryogenic testing case is columnar structured, four the 360 degree swiveling wheels that are provided with in the bottom half symmetry, the tank wall of cryogenic testing case is divided into internal protection layer, heat-insulation layer, outer protection layer from inside to outside, the internal protection layer can be made by aluminium alloy or ultralow temperature 06Ni9 steel, heat-insulation layer can adopt polyurethane sheet to make, and the outer protection layer can adopt general steel plate to make; Casing divides upper cover and lower box two parts, and upper cover adopts tongue and groove to be connected with lower box, and is provided with gasket seal and lower seal pad, and upper gasket seal and lower seal pad adopt trifluoro pad material material; The upper cover enclosed switch can select plain bolt connection, strong electromagnet switch to connect, and up and down two parts are respectively equipped with handle to facilitate casing to pick and place; The tank wall of cryogenic testing case is crossed with fixed wiring, fixed wiring has internal wiring head and external the end of a thread, the internal wiring head is connected with internal measurement equipment, external measurement devices by connecting line respectively with external the end of a thread, internal measurement equipment is ultralow temperature foil gauge, ultralow temperature temperature inductor etc., and external measurement devices is the display device of parameters; The cryogenic testing lower box part is provided with controller, thereby controller is used for the temperature that the evaporation capacity of liquid nitrogen in the adjusting unit interval is controlled box house, controller is connected with liquid nitrogen container respectively at electric cabinet with liquid nitrogen pipe by electrical control lines, and then the self-correcting mechanism of formation temperature.
Preferably, two ends, casing up and down symmetry be provided with opening, both ends open is large outer little tapered in all, the both ends open place is provided with sealing-plug.Have by the outer protection layer in the outer face of bellmouth and shrink the hoop that forms in the hole, hoop is used for limiting the displacement of sealing-plug; The inner face of the bellmouth outside forms the casing projection, and the casing projection is similarly the body structure part, and casing projection lateral surface is rod thread, and casing projection bottom surface is provided with annular protrusion; Sealing-plug is taper and the major part end formation head of a nail, and sealing-plug adopts trifluoro pad material to make, and sealing-plug is fixed on the casing projection by the bowl-type nut.
Preferably, bowl type nut is that ultralow temperature 06Ni9 steel is made, and wherein the medial surface of bowl type nut is made rod thread, in order to be threaded connection with the casing projection; The inner bottom surface of bowl type nut is provided with annular protrusion; Bowl-type nut end face is provided with the bowl-type nut and boxes out.
The present invention compared with prior art has following advantage:
(1), cryogenic testing case of the present invention and suspended rail formula dolly are separate device, the rigidity suspending rod top of supporting trolley track is provided with temporary anchoring device, track can be temporarily fixed on tension tester, the cryogenic testing case is placed on little car bottom plate.Temporary fixed track also carries out located lateral so that follow-up test is located fast, has reduced the experimental implementation cycle.
(2), the sealing-plug material of this experimental provision is the high-quality trifluoro of anti-ultralow temperature pad material, can be used for the encapsulant under the ultralow temperature state, Applicable temperature is-200 ℃ to 150 ℃.
(3), resistance and post-tensioning combination before the fixedly employing of the sealed at both ends plug of cryogenic testing case, i.e. stopping and the extruding of bowl type nut of hoop, avoid because the sealing-plug displacement is excessive, reinforcing bar being produced excessive extruding force and the accuracy that affects experimental result.
(4), being connected of cryogenic testing box cover and lower box adopt tongue and groove to connect, and be provided with the ultralow temperature pad that the high-quality trifluoro of anti-ultralow temperature pad material makes and accomplish further sealing.
(5), cryogenic testing case tank wall is embedded with fixed wiring, connector lug is left at two ends, so as in connecting box with outer measurement mechanism and the instrument of case.
Description of drawings
Fig. 1 is that ultra-low temperature testing device master of the present invention looks schematic diagram;
Fig. 2 is ultra-low temperature testing device schematic side view of the present invention;
Fig. 3 is that the little car owner of suspended rail formula looks schematic diagram;
Fig. 4 is suspended rail formula dolly schematic side view;
The ground tackle master of suspended rail formula dolly looks schematic diagram to Fig. 5 in order to be used for fixedly;
Fig. 6 is for being used for the fixedly ground tackle schematic side view of suspended rail formula dolly;
Fig. 7 is the diagrammatic cross-section of suspended rail formula dolly track when wheel is arranged;
Fig. 8 is the schematic perspective view of suspended rail formula dolly track during without wheel;
Fig. 9 is cryogenic testing box structure schematic diagram;
Figure 10 is cryogenic testing case sealing-plug organigram;
Figure 11 is the bowl type nut organigram of anchor portion sealing-plug.
In figure: 1, universal tensile testing machine; 2, suspended rail formula dolly; 3, cryogenic testing case; 4, liquid nitrogen container; 5, electric cabinet; 6, external measurement devices; 7, dolly; 8, suspended rail; 9, liquid nitrogen pipe; 10, electrical control lines; 11, supported and suspended track cross beam; 12, ground tackle; 13, large diameter steel pipe; 14, extension type suspending rod; 15, fastening bolt; 16, minor-diameter steel-tube; 17, vertical brace; 18, track; 19, car wheel; 20, be used for the rigid rod that little car bottom plate is hung in choosing; 21, little car bottom plate; , 22 horizontal braces; 23, coupling bolt; 24, set bolt; 25, sealing-plug; 26, bowl type nut; 27, upper gasket seal; 28, lower seal pad; 29, upper cover enclosed switch; 30, internal protection layer; 31, warming plate; 32, outer protection layer; 33, across wiring; 34, external the end of a thread; 35, internal wiring head; 36, test specimen; 37, upper cover handle; 38, lower box handle; 39, controller; 40,360 degree swiveling wheels; 41, internal measurement equipment; 42, working at ultra-low temperature chamber; 43, casing projection and bowl type nut connection of thread; 44, casing projection; 45, hoop; 46, bowl type nut inner thread is processed; 47, bowl type nut base circle projection; 48, bowl type nut is boxed out; 49, annular protrusion.
Embodiment
As shown in Fig. 1-2, steel bar mechanics performance tester for testing under ultra-low temperature surroundings comprises universal tensile testing machine 1, suspended rail formula dolly 2, cryogenic testing case 3, liquid nitrogen container 4, electric cabinet 5 and external measurement devices 6; Suspended rail formula dolly 2 hangs on universal tensile testing machine 1 upper end, cryogenic testing case 3 is positioned on suspended rail formula dolly 2 with convenient turnover universal tensile testing machine 1, liquid nitrogen container 4 is connected with controller 39 on cryogenic testing case 3 by liquid nitrogen pipe 9, electric cabinet 5 is connected with controller 39 on cryogenic testing case 3 by electrical control lines 10, and external measurement devices 6 is connected and then reads the data that internal measurement equipment 41 records with external the end of a thread 34 on cryogenic testing case 3 by connecting line; Universal tensile testing machine 1 is used for test specimen is loaded, suspended rail formula dolly 2 is used for support cryogenic testing case 3, cryogenic testing case 3 is for providing experiment required ultra-low temperature surroundings, liquid nitrogen container 4 is used for holding the cold-producing medium liquid nitrogen, the temperature that electric cabinet 5 is used in Based Intelligent Control cryogenic testing case 3, external measurement devices 6 is used for reading experimental data.
As shown in Fig. 1-8, suspended rail formula dolly 2 comprises dolly 7 and two suspended rails 8; Article two, suspended rail is parallel.Every suspended rail 8 comprises crossbeam 11, ground tackle 12, extension type suspending rod 14, vertical brace 17, horizontal brace 22 and track 18; The ground tackle 12 of crossbeam 11 by two ends is fixed on universal tensile testing machine 1 upper end, by coupling bolt 23, ground tackle 12 and crossbeam 11 anchorings are tightly formed an integral body, set bolt 24 on ground tackle 12 and then the integral body that will form and universal tensile testing machine upper end are fixed, thereby reach the purpose of fixed cross beam.
Crossbeam 11 two ends are hung with respectively extension type suspending rod 14, and crossbeam 11 can be fixed with bolts with extension type suspending rod 14.Four extension type suspending rod 14 are respectively equipped with on both direction intersects horizontal brace 22 with vertically brace 17 is to strengthen structural integrity, and laterally brace 22 and vertical brace 17 are fixed with bolts with extension type suspending rod 14.
Extension type suspending rod 14 consists of by the different steel pipe of two diameters is nested, minor-diameter steel-tube 16 stretches in large diameter steel pipe 13, large diameter steel pipe 13 tube walls are embedded with fastening bolt 15, when minor-diameter steel-tube 16 in the interior flexible extruding minor-diameter steel-tube of fastening bolt 15 being tightened when reaching desired height of large diameter steel pipe 13 with the fixing length of extension type suspending rod 14.
Dolly 7 comprises four wheels 19, four rigid bars 20 and dolly base plate 21, two wheels 19 are arranged in every track 18, each wheel 19 is connected with four angles of little car bottom plate by a rigid rod 20, wheel 19 can free in and out track 18 and slide in track 18, and rigid bar 20 is fixed with bolts with dolly base plate 21.Dolly base plate 21 has certain rigidity and intensity and centre boxes out, and dolly base plate 21 can select steel plate also can select scale board.
Shown in Fig. 1-3,9, cryogenic testing case 3 is columnar structured, at four the 360 degree swiveling wheels 40 that are provided with of bottom half symmetry, to facilitate the parallel of casing.The tank wall of cryogenic testing case 3 is divided into internal protection layer 30, heat-insulation layer 31, outer protection layer 32 from inside to outside; internal protection layer 30 can be made by aluminium alloy or ultralow temperature 06Ni9 steel; heat-insulation layer 31 can adopt polyurethane sheet to make, and outer protection layer 32 can adopt general steel plate to make.Casing divides upper cover and lower box two parts, and upper cover and lower box adopt tongue and groove to be connected, and is provided with gasket seal 27 and lower seal pad 28 to accomplish effective sealing, upper gasket seal 27 and lower seal pad 28 employing trifluoro pad material materials.Upper cover enclosed switch 29 can select that plain bolt connects, the strong electromagnet switch connects, and up and down two parts are respectively equipped with handle 37 and handle 38 to facilitate casing to pick and place.The tank wall of cryogenic testing case 3 is crossed with fixed wiring 33, fixed wiring 33 has internal wiring head 35 and external the end of a thread 34, internal wiring head 35 is connected with internal measurement equipment 41, external measurement devices 6 by connecting line respectively with external the end of a thread 34, internal measurement equipment 41 is ultralow temperature foil gauge, ultralow temperature temperature inductor etc., external measurement devices 6 is the display device of parameters, and internal measurement equipment 41, external measurement devices 6 all belong to this area existing equipment.Cryogenic testing case 3 bottoms are provided with controller 39, thereby controller 39 is used for the temperature that the evaporation capacity of liquid nitrogen in the adjusting unit interval is controlled box house, controller 39 is connected with liquid nitrogen container 4 respectively at electric cabinet 5 with liquid nitrogen pipe 9 by electrical control lines 10, and then the self-correcting mechanism of formation temperature, controller 39 and electric cabinet 5 all belong to existing equipment.
As shown in Fig. 9-11, two ends, casing up and down symmetry be provided with opening, both ends open is large outer little tapered in all, the both ends open place is provided with sealing-plug 25.Have by outer protection layer 32 in the outer face of bellmouth and shrink the hoop 45 that forms in the hole, hoop 45 is used for limiting the displacement of sealing-plug 25; The inner face of the bellmouth outside forms casing projection 44, and casing projection 44 is similarly the body structure part, and casing projection 44 lateral surfaces 43 be rod thread, and casing protruding 44 bottom surfaces are provided with annular protrusion 49.Sealing-plug 25 is taper and the major part end formation head of a nail, and sealing-plug 25 adopts trifluoro pad materials to make, and sealing-plug 25 is fixed on casing projection 44 by bowl-type nut 26.Bowl type nut 26 is made for ultralow temperature 06Ni9 steel, can satisfy the performance requirement under ultralow temperature, and wherein the medial surface 46 of bowl type nut 26 is made rod thread, in order to be connected by screw thread 43 with casing projection 44; The inner bottom surface of bowl type nut 26 is provided with annular protrusion 47, and purpose is and the extruding force of the corresponding enhancing of annular protrusion 49 to sealing-plug 25, can plays the staking effect to sealing-plug 25 when sealing-plug 25 is excessive to outer displacement; Bowl-type nut 26 end faces are provided with the bowl-type nut and box out 48.
The experimental implementation flow process is as follows:
Dolly is pushed universal tensile testing machine along track 18, this moment by track before located lateral and high computational after the space reserved make upper end-fixture just in time can clamp reinforcing bar, then the lower end fixture being moved up reaches the height that can clamp reinforcing bar.Set experiment by electric cabinet 5 temperature required, check that each instrument, beginning liquid nitrogen carry and to lower the temperature, reach required test temperature after two ends clamp reinforcing bar stretch, note the reading of extension instrument in drawing process, carry out the record of experimental data.
After a test specimen stretched and finishes, stop solution nitrogen cycle bare terminal end was decontroled, and dolly is pulled out along track 18, opened cryogenic testing case 3 and changed test specimen 36, repeated to appeal the tension test that flow process is completed each test specimen.
Claims (10)
1. steel bar mechanics performance tester for testing under ultra-low temperature surroundings, comprise universal tensile testing machine, suspended rail formula dolly, cryogenic testing case, liquid nitrogen container, electric cabinet and external measurement devices; It is characterized in that: suspended rail formula dolly hangs on the universal tensile testing machine upper end, the cryogenic testing case is positioned on suspended rail formula dolly, liquid nitrogen container is connected with controller on the cryogenic testing case by liquid nitrogen pipe, electric cabinet is connected with controller on the cryogenic testing case by electrical control lines, and external measurement devices is connected and then reads the data that internal measurement equipment records with external the end of a thread on the cryogenic testing case by connecting line.
2. steel bar mechanics performance tester for testing under ultra-low temperature surroundings according to claim 1, it is characterized in that: above-mentioned suspended rail formula dolly comprises dolly and two suspended rails, and two suspended rails are parallel; Every suspended rail comprises crossbeam, ground tackle, extension type suspending rod, vertical brace, horizontal brace and track; The ground tackle of crossbeam by two ends is fixed on the universal tensile testing machine upper end, and with ground tackle and the crossbeam anchoring is tight forms an integral body, the set bolt on ground tackle and then the integral body that will form and universal tensile testing machine upper end are fixed by coupling bolt.
3. steel bar mechanics performance tester for testing under according to claim 1-2 described ultra-low temperature surroundings is characterized in that: crossbeam two ends are hung with respectively the extension type suspending rod, and crossbeam and extension type suspending rod can be fixed with bolts; Four extension type suspending rod are respectively equipped with on both direction intersects horizontal brace with vertically brace is to strengthen structural integrity, and laterally brace and vertical brace and extension type suspending rod are fixed with bolts.
4. steel bar mechanics performance tester for testing under according to claim 1-3 described ultra-low temperature surroundings, it is characterized in that: the extension type suspending rod consists of by the different steel pipe of two diameters is nested, minor-diameter steel-tube stretches in large diameter steel pipe, the Large-diameter Steel tube wall is embedded with fastening bolt, fastening bolt is tightened the extruding minor-diameter steel-tube when the Large-diameter Steel inner telescoping tube reaches desired height when minor-diameter steel-tube.
5. steel bar mechanics performance tester for testing under according to claim 1-4 described ultra-low temperature surroundings, it is characterized in that: dolly comprises little car bottom plate, four wheels and four rigid bars, two wheels are arranged in every track, each wheel is connected with four angles of little car bottom plate by a rigid rod, wheel can free in and out track and slide in track, and rigid bar and little car bottom plate are fixed with bolts; Little car bottom plate has certain rigidity and intensity and centre and boxes out.
6. steel bar mechanics performance tester for testing under according to claim 1-5 described ultra-low temperature surroundings, it is characterized in that: little car bottom plate is selected steel plate or scale board.
7. steel bar mechanics performance tester for testing under according to claim 1-6 described ultra-low temperature surroundings, it is characterized in that: the cryogenic testing case is columnar structured, four the 360 degree swiveling wheels that are provided with in the bottom half symmetry, the tank wall of cryogenic testing case is divided into internal protection layer, heat-insulation layer, outer protection layer from inside to outside, the internal protection layer can be made by aluminium alloy or ultralow temperature 06Ni9 steel, heat-insulation layer can adopt polyurethane sheet to make, and the outer protection layer can adopt general steel plate to make; Casing divides upper cover and lower box two parts, and upper cover adopts tongue and groove to be connected with lower box, and is provided with gasket seal and lower seal pad, and upper gasket seal and lower seal pad adopt trifluoro pad material material; The upper cover enclosed switch can select plain bolt connection, strong electromagnet switch to connect, and up and down two parts are respectively equipped with handle to facilitate casing to pick and place; The tank wall of cryogenic testing case is crossed with fixed wiring, fixed wiring has internal wiring head and external the end of a thread, the internal wiring head is connected with internal measurement equipment, external measurement devices by connecting line respectively with external the end of a thread, internal measurement equipment is ultralow temperature foil gauge, ultralow temperature temperature inductor etc., and external measurement devices is the display device of parameters; The cryogenic testing lower box part is provided with controller, thereby controller is used for the temperature that the evaporation capacity of liquid nitrogen in the adjusting unit interval is controlled box house, controller is connected with liquid nitrogen container respectively at electric cabinet with liquid nitrogen pipe by electrical control lines, and then the self-correcting mechanism of formation temperature.
8. steel bar mechanics performance tester for testing under according to claim 1-7 described ultra-low temperature surroundings is characterized in that: two ends, casing up and down symmetry be provided with opening, both ends open is large outer little tapered in all, the both ends open place is provided with sealing-plug.
9. steel bar mechanics performance tester for testing under according to claim 1-8 described ultra-low temperature surroundings is characterized in that: have by the outer protection layer in the outer face of bellmouth and shrink the hoop that forms in the hole, hoop is used for limiting the displacement of sealing-plug; The inner face of the bellmouth outside forms the casing projection, and the casing projection is similarly the body structure part, and casing projection lateral surface is rod thread, and casing projection bottom surface is provided with annular protrusion; Sealing-plug is taper and the major part end formation head of a nail, and sealing-plug adopts trifluoro pad material to make, and sealing-plug is fixed on the casing projection by the bowl-type nut.
10. steel bar mechanics performance tester for testing under according to claim 1-9 described ultra-low temperature surroundings, it is characterized in that: bowl type nut is that ultralow temperature 06Ni9 steel is made, wherein the medial surface of bowl type nut is made rod thread, in order to be threaded connection with the casing projection; The inner bottom surface of bowl type nut is provided with annular protrusion; Bowl-type nut end face is provided with the bowl-type nut and boxes out.
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| CN104749452A (en) * | 2013-12-27 | 2015-07-01 | 研祥智能科技股份有限公司 | Low-temperature testing device and testing method |
| CN104330319A (en) * | 2014-11-04 | 2015-02-04 | 水利部交通运输部国家能源局南京水利科学研究院 | Testing device capable of coupling stress field and chemical field |
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| CN109990765A (en) * | 2019-03-25 | 2019-07-09 | 水利部南京水利水文自动化研究所 | A kind of straight line flume rail levelness tester |
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| CN110102687A (en) * | 2019-06-11 | 2019-08-09 | 广东工业大学 | A kind of low temperature compression apparatus for reducing diameter |
| 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 |
| CN113670603A (en) * | 2021-10-22 | 2021-11-19 | 常州华德机械有限公司 | Ultra-low temperature gearbox testing device for electric locomotive |
| CN115420605A (en) * | 2022-09-15 | 2022-12-02 | 中国石油大学(华东) | Experimental device and method for transmitting chloride ions in concrete with temperature difference on two sides |
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