CN104568397A - Multifunctional automatic performance testing device for low-temperature valve - Google Patents
Multifunctional automatic performance testing device for low-temperature valve Download PDFInfo
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- CN104568397A CN104568397A CN201310522050.1A CN201310522050A CN104568397A CN 104568397 A CN104568397 A CN 104568397A CN 201310522050 A CN201310522050 A CN 201310522050A CN 104568397 A CN104568397 A CN 104568397A
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Abstract
The invention relates to a multifunctional automatic performance testing device for a low-temperature valve. The multifunctional automatic performance testing device mainly consists of a machine frame, an upper cover locking air cylinder, a locking position moving air cylinder, an upper cover, a computer controller, an air outlet pipeline, a motor encoder, a lifting decelerator, an upper cover lifting and pressing air cylinder, a torque sensor, an air inlet pipeline, a washing and cold-liquid absorbing pipeline, an air sucking pipeline, a vacuum pump, a low-temperature liquid tank, a nitrogen detection tank, a pressure sensor, a connection flange, a tested valve, an adjustable valve mounting base, a low-temperature box and a technological hole plug. Compared with the prior art, the multifunctional automatic performance testing device for the low-temperature valve, which is provided by the invention, has the advantages of high degree of automation, multiple functions, and the like.
Description
Technical field
The present invention relates to valve test and Performance Detection, especially relate to the multi-functional automatic performance proving installation of a kind of Subzero valve, can Subzero valve performance test and quality inspection be carried out.
Background technology
The quality of valve mass directly has influence on sealing and the leaking performance of finished product packing, so its quality becomes valve use the emphasis paid close attention to manufacturing enterprise, valve type test is mainly to test and the evaluation of free switch number of times, valve leak and the switch parameter of valve under low temperature (-198 DEG C ~ 50 DEG C) state.Its test macro is mainly with the temperature of valve body, valve gap, and leakage and valve inlet and outlet pressure, on-off times, switching torque and Leak Detection are main.By then carrying out data processing by computing machine to the automatic collection of these parameters, finally make the report of valve type conclusion (of pressure testing).
Subzero valve measuring technology is that Subzero valve manufactures one of gordian technique.Domestic valve manufacture industry size has been in international prostatitis, is valve manufacture big country.But in valve production technology, there is larger gap with developed country, particularly Special valve, high/low temperature valve, minute adjustment valve, also there is larger gap in production, measuring technology, some special trades, the Special valve overwhelming majority of iron and steel, chemical industry, oil and gas industry application remains imported valve, and the multi-functional automatic performance proving installation of Subzero valve of the present invention not only can be applied to Subzero valve, also can be generalized to the application scenario that other is similar, there is dissemination.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of Subzero valve multi-functional automatic performance proving installation.
Object of the present invention can be achieved through the following technical solutions: the multi-functional automatic performance proving installation of a kind of Subzero valve, is characterized in that, comprise
Cryogenic box, valve system: comprise pressure transducer 17, joint flange 18, valve to be tested 19, adjustable valve installation seat 20, cryogenic box 21, described valve to be tested 19 is arranged in cryogenic box 21 by adjustable valve installation seat 20, and the joint flange 18 connecting air inlet pipeline and outlet pipe is installed in valve 19 both sides to be tested, and detect the pressure transducer 17 of gaseous tension;
Upper cover operating system: comprise frame 1, upper cover locking cylinder 2, locked position move cylinder 3, upper cover 4, upper cover promote compression cylinder 9, described cryogenic box 21 is arranged in frame 1, described upper cover 4 is cryogenic box 21 upper cover, described frame 1 and the side of cryogenic box 21 install cover locking cylinder 2 and locked position moves cylinder 3, installs upper cover and promote compression cylinder 9 between described upper cover 4 and frame 1; Realize upper cover 4 to realize under the control of the computer rising and closing, and compress with the sealing coordinating upper cover locking cylinder 2 to realize upper cover.
Valve rod operating mechanism: comprise motor encoder 7, lifting deceleration machine 8, torque sensor 10, described lifting deceleration machine 8 connects the valve rod of valve 19 to be detected, and on the drive motor of lifting deceleration machine 8 mounted motor scrambler 7, on output shaft mounting torque sensor 10; The requirement of valve model can be adapted in operation according to the length of the model determination output shaft of valve, tracking adjustment can be carried out according to the length variations in valve rod rotary course, can Open valve automatically; Test the unlatching moment of valve, carry out valve opening life test.
Test nitrogen system: comprise and detect nitrogen pot 16, air inlet pipeline 11, outlet pipe 6, described detection nitrogen pot 16 connects valve 19 one end to be tested by air inlet pipeline 11, and described outlet pipe 6 connects valve 19 other end to be tested;
Low temperature cold liquid system canister: comprise flushing and cold liquid suction line 12, exhaust pipe 13, vacuum pump 14, low temperature flow container 15, technique stopple 22, described flushing and cold liquid suction line 12 and exhaust pipe 13 are connected on low temperature flow container 15, described vacuum pump 14 connects exhaust pipe 13, and described technique stopple 22 is arranged on upper cover 4;
Computer Control Unit 5: connect source nitrogen, low temperature flow container 15, upper cover operating system, valve rod operating mechanism and test nitrogen system respectively, and output detections result.
Described adjustable valve installation seat 20 comprise with valve standing finish 2 V-blocks, be fixed with the base plate of guide rail, base plate is bolted on cryogenic box 21 bottom surface, and 2 V-blocks fix valve 19 to be tested, and at slide on rails.
Size and shape and the valve to be tested 19 of 2 described V-blocks match.2 V-blocks can according to the profile of valve at slide on rails, adapt to the requirement of different valve size, what exceed V-block when valve to be tested can carry out changing the installation that other V-block adapts to different size series valve during installation dimension, ensure that valve position in test process is fixed, meet valve opening and torque test requirement.
Described upper cover 4 is provided with two technique consents, a technique stopple 22 for sealing respectively is provided with in each technique consent, before detection, two technique consents are opened, and insert flexible pipe wherein in a hole and connect Nitrogen source gases, air displacement in cryogenic box is gone out, then uses two technique stopple 22 seal and openings.
Described low temperature flow container 15 is connected to the technique consent on upper cover 4 by change-over switch, after discharging the gas in cryogenic box 21, switch the cryogenic liquid in low temperature flow container 15 to be pressed in cryogenic box by same pipeline by change-over switch and block technique stopple 22, after detection terminates, by vacuum pump 14 and pipeline of sobbing the cryogenic liquid in cryogenic box is recovered to low temperature flow container 15.Increase nitrogen at low temperature flow container 15 and enter pipeline, realization nitrogen is replaced the air in cryogenic box 21, low temperature flow container 15, pipeline, and utilizes vacuum pump 14 to carry out the recovery of cryogenic liquid, utilizes the pressure of external nitrogen to carry out the conveying of cryogenic liquid.
Setting pressure sensor 17 on the set bolt of described joint flange 18, tests the situation of change of bolt-locking power under the environment of low temperature, for the type selecting of erection bolt and locking provide design considerations.
Its mid frame 1 is that the whole parts of basic part of device are all installed in frame.Upper cover locking cylinder 2 is arranged according to the size of cryogenic box and seal request, is used for locking upper cover.It is the positions adjusting upper cover locking cylinder 2 when switch upper cover that locked position moves cylinder 3.Upper cover 4 prevents cryogenic liquid from issuing additional.Computer Control Unit 5 is that the maincenter of device is used for receiving, processing data; Control system, output detections are reported.Gas outlet pipe is revealed in outlet pipe 6 valve.Motor encoder 7 is arranged on the drive motor axle of lifting deceleration machine 8, by motor speed, measures and is arranged on the movable length that lifting deceleration machine 8 exports screw mandrel.Upper cover promotes compression cylinder 9 and is used for promoting, compressing; Upper cover 4.Torque sensor 10 is arranged on lifting deceleration machine 8 output shaft and measures valve rod operation moment of torsion.Air inlet pipeline 11 detects the connecting line between nitrogen pot 16 and Subzero valve, conveying test nitrogen.Flushing and cold liquid suction line 12 connect external source nitrogen and cryogenic box 21, low temperature flow container 15 supplying nitrogen and cryogenic liquid.Exhaust pipe 13 connects vacuum pump 14, low temperature flow container 15 reclaims cryogenic liquid, and low temperature flow container 15 deposits cryogenic liquid.Detect nitrogen pot 16 and deposit detection nitrogen.Pressure transducer 17 be arranged on test valve 19 and joint flange 18 coupling bolt on control and measuring bolt-locking power.Adjustable valve mount pad 20 installation testing Subzero valve, is made up of 2 V-blocks, base plate, guide rails, and V-block can move and change model on guide rail, adapts to different valve test needs.The place of cryogenic box 21 installation testing Subzero valve and cryogenic media.Technique stopple 22 is for blocking covers 2 technique perforates, and one is slotting cryogenic liquid and nitrogen pipeline, and hole is air row mouth in addition.
Principle of work is:
Also fixing according to Subzero valve model adjustment adjustable valve mount pad V-block, move cylinder 3 by upper cover operating mechanism upper cover locking cylinder 2, locked position, upper cover promotes compression cylinder 9 and upper cover and cryogenic box covered tightly, low temperature cold liquid system canister source nitrogen is by rinsing and cold liquid suction line 12; Exhaust pipe 13; After nitrogen being inputted the air in cryogenic box displacement case, to be pressed in cryogenic box by the cryogenic liquid in low temperature flow container 15 to block technique stopple 22 by change-over switch by same pipeline, test nitrogen system is by (detecting nitrogen pot 16; Air inlet pipeline 11; Outlet pipe 6; Test nitrogen is passed into tested Subzero valve, according to test request operating valve lever operating mechanism (motor encoder 7; Lifting deceleration machine 8; Torque sensor 10) carry out testing valve performance, whole test process has computer control system to control, and has tested rear output test report.
Compared with prior art, a kind of multistage even pressure type Subzero valve packoff of the present invention adopts nitrogen as build-in test gas, ethanol is adopted in cryogenic box, liquid nitrogen mixing material is as low temperature environment medium, in cryogenic box, adjustable valve mount pad can be exchanged by local directed complete set and accessory and can fix multiple serial Subzero valve, the air displacement of low temperature case lid, the turnover of cryogenic liquid, open and sealing, the unlatching of valve, mechanical hook-up is all adopted to control automatic operation by computing machine, the collection of test signal, process, control, export and process by computing machine, during how device can be carried out, serial Subzero valve carries out external seal in low temperature under low temperature (-196 DEG C) environment, operational torque, Bolt Tightening Force, valve material performance running parameter at low ambient temperatures, the operation lifetime of valve seal (comprising sealing in valve rod and valve) carries out the detection of performance dynamic state of parameters, the robotization of test operation is realized in test job, intelligent.For Subzero valve test provides advanced solution.
Beneficial effect of the present invention is:
(1) automatically opening and closing of low temperature case lid, is achieved.
(2) automatic operation, achieving valve rod measures moment of torsion simultaneously.
(3) monitoring and the measurement of low temperature environment lower flange clamping screw coupling mechanism force, is achieved.
(4), achieve a tractor serves several purposes, measure multiple index.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is fundamental diagram of the present invention.
Identify in figure: 1. frame; 2. upper cover locking cylinder; 3. locked position moves cylinder; 4. upper cover; 5. Computer Control Unit; 6. outlet pipe; 7. motor encoder; 8. lifting deceleration machine; 9. upper cover promotes compression cylinder; 10. torque sensor; 11. air inlet pipelines; 12. rinse and cold liquid suction line; 13. exhaust pipes; 14. vacuum pumps; 15. low temperature flow containers; 16. detect nitrogen pot; 17 pressure transducers; 18. joint flanges; 19. test valves; 20. adjustable valve mount pads; 21. cryogenic boxes; 22. technique stopples.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Fig. 1 ~ 2, the multi-functional automatic performance proving installation of a kind of Subzero valve, comprises
Cryogenic box, valve system: comprise pressure transducer 17, joint flange 18, valve to be tested 19, adjustable valve installation seat 20, cryogenic box 21, described valve to be tested 19 is arranged in cryogenic box 21 by adjustable valve installation seat 20, and the joint flange 18 connecting air inlet pipeline and outlet pipe is installed in valve 19 both sides to be tested, and detect the pressure transducer 17 of gaseous tension;
Upper cover operating system: comprise frame 1, upper cover locking cylinder 2, locked position move cylinder 3, upper cover 4, upper cover promote compression cylinder 9, described cryogenic box 21 is arranged in frame 1, described upper cover 4 is cryogenic box 21 upper cover, described frame 1 and the side of cryogenic box 21 install cover locking cylinder 2 and locked position moves cylinder 3, installs upper cover and promote compression cylinder 9 between described upper cover 4 and frame 1; Realize upper cover 4 to realize under the control of the computer rising and closing, and compress with the sealing coordinating upper cover locking cylinder 2 to realize upper cover.
Valve rod operating mechanism: comprise motor encoder 7, lifting deceleration machine 8, torque sensor 10, described lifting deceleration machine 8 connects the valve rod of valve 19 to be detected, and on the drive motor of lifting deceleration machine 8 mounted motor scrambler 7, on output shaft mounting torque sensor 10; The requirement of valve model can be adapted in operation according to the length of the model determination output shaft of valve, tracking adjustment can be carried out according to the length variations in valve rod rotary course, can Open valve automatically; Test the unlatching moment of valve, carry out valve opening life test.
Test nitrogen system: comprise and detect nitrogen pot 16, air inlet pipeline 11, outlet pipe 6, described detection nitrogen pot 16 connects valve 19 one end to be tested by air inlet pipeline 11, and described outlet pipe 6 connects valve 19 other end to be tested;
Low temperature cold liquid system canister: comprise flushing and cold liquid suction line 12, exhaust pipe 13, vacuum pump 14, low temperature flow container 15, technique stopple 22, described flushing and cold liquid suction line 12 and exhaust pipe 13 are connected on low temperature flow container 15, described vacuum pump 14 connects exhaust pipe 13, and described technique stopple 22 is arranged on upper cover 4;
Computer Control Unit 5: connect source nitrogen, low temperature flow container 15, upper cover operating system, valve rod operating mechanism and test nitrogen system respectively, and output detections result.
Described adjustable valve installation seat 20 comprise with valve standing finish 2 V-blocks, be fixed with the base plate of guide rail, base plate is bolted on cryogenic box 21 bottom surface, and 2 V-blocks fix valve 19 to be tested, and at slide on rails.
Size and shape and the valve to be tested 19 of 2 described V-blocks match.2 V-blocks can according to the profile of valve at slide on rails, adapt to the requirement of different valve size, what exceed V-block when valve to be tested can carry out changing the installation that other V-block adapts to different size series valve during installation dimension, ensure that valve position in test process is fixed, meet valve opening and torque test requirement.
Described upper cover 4 is provided with two technique consents, a technique stopple 22 for sealing respectively is provided with in each technique consent, before detection, two technique consents are opened, and insert flexible pipe wherein in a hole and connect Nitrogen source gases, air displacement in cryogenic box is gone out, then uses two technique stopple 22 seal and openings.
Described low temperature flow container 15 is connected to the technique consent on upper cover 4 by change-over switch, after discharging the gas in cryogenic box 21, switch the cryogenic liquid in low temperature flow container 15 to be pressed in cryogenic box by same pipeline by change-over switch and block technique stopple 22, after detection terminates, by vacuum pump 14 and pipeline of sobbing the cryogenic liquid in cryogenic box is recovered to low temperature flow container 15.Increase nitrogen at low temperature flow container 15 and enter pipeline, realization nitrogen is replaced the air in cryogenic box 21, low temperature flow container 15, pipeline, and utilizes vacuum pump 14 to carry out the recovery of cryogenic liquid, utilizes the pressure of external nitrogen to carry out the conveying of cryogenic liquid.
Setting pressure sensor 17 on the set bolt of described joint flange 18, tests the situation of change of bolt-locking power under the environment of low temperature, for the type selecting of erection bolt and locking provide design considerations.
Detected by following steps:
1, proving installation locked position moves cylinder 3 and moves; On upper cover locking cylinder 2, fixed block leaves upper cover 4, and upper cover promotes compression cylinder 9, lifting deceleration machine 8 rises to extreme higher position.
2,2 V-blocks on adjustable valve mount pad 20 are selected according to valve mechanism, installation testing Subzero valve, joint flange 18 and pressure transducer 10.
3, upper cover promotes upper cover 4 on compression cylinder 9 removable cover and compresses.Locked position moves cylinder 3 and moves; Upper cover locking cylinder 2 locks upper cover.
4, open technique consent, in left hole, insert stainless steel flexible hose.
5, open external source nitrogen valve, air in cryogenic box is displaced.
6, flexible pipe technique stopple 22 seal and opening is extracted.
7, open cryogenic liquid and extrude valve, utilize external nitrogen that cryogenic liquid is transported to cryogenic box 21 from low temperature flow container 15.
8, adjust lifting deceleration machine 8 output terminal to be connected with valve rod spanner.
9, open detection nitrogen pot 16, air inlet pipeline 11 valve, test nitrogen enters test for low temperature valve.
10, start-up simulation machine control device 5 test control program starts to test by test technology.
11, output test result, comprise the operation lifetime of valve to be detected, bolt-locking power, sealing data and torque data.
12, start cryogenic liquid reclaimer, open vacuum pump 14 and cryogenic liquid is recovered to low temperature flow container 15 from cryogenic box 21.
13, proving installation locked position moves cylinder 3 and moves; On upper cover locking cylinder 2, fixed block leaves upper cover 4, and upper cover promotes compression cylinder 9, lifting deceleration machine 8 rises to extreme higher position, and upper cover 4 is raised to extreme higher position.
14, dismantle test for low temperature valve, complete test.
Claims (6)
1. the multi-functional automatic performance proving installation of Subzero valve, is characterized in that, comprise
Cryogenic box, valve system: comprise pressure transducer (17), joint flange (18), valve to be tested (19), adjustable valve installation seat (20), cryogenic box (21), described valve to be tested (19) is arranged in cryogenic box (21) by adjustable valve installation seat (20), and the joint flange (18) connecting air inlet pipeline and outlet pipe is installed in valve to be tested (19) both sides, and detect the pressure transducer (17) of gaseous tension;
Upper cover operating system: comprise frame (1), upper cover locking cylinder (2), locked position move cylinder (3), upper cover (4), upper cover promote compression cylinder (9), described cryogenic box (21) is arranged in frame (1), described upper cover (4) is cryogenic box (21) upper cover, described frame (1) and the side of cryogenic box (21) install cover locking cylinder (2) and locked position moves cylinder (3), installs upper cover and promote compression cylinder (9) between described upper cover (4) and frame (1);
Valve rod operating mechanism: comprise motor encoder (7), lifting deceleration machine (8), torque sensor (10), described lifting deceleration machine (8) connects the valve rod of valve to be detected (19), and on the drive motor of lifting deceleration machine (8) mounted motor scrambler (7), on output shaft mounting torque sensor (10);
Test nitrogen system: comprise and detect nitrogen pot (16), air inlet pipeline (11), outlet pipe (6), described detection nitrogen pot (16) connects valve to be tested (19) one end by air inlet pipeline (11), and described outlet pipe (6) connects valve to be tested (19) other end;
Low temperature cold liquid system canister: comprise flushing and cold liquid suction line (12), exhaust pipe (13), vacuum pump (14), low temperature flow container (15), technique stopple (22), described flushing and cold liquid suction line (12) and exhaust pipe (13) are connected on low temperature flow container (15), described vacuum pump (14) connects exhaust pipe (13), and described technique stopple (22) is arranged on upper cover (4);
Computer Control Unit (5): connect source nitrogen, low temperature flow container (15), upper cover operating system, valve rod operating mechanism and test nitrogen system respectively, and output detections result.
2. the multi-functional automatic performance proving installation of a kind of Subzero valve according to claim 1, it is characterized in that, described adjustable valve installation seat (20) comprise with valve standing finish 2 V-blocks, be fixed with the base plate of guide rail, base plate is bolted on cryogenic box (21) bottom surface, 2 V-blocks fix valve to be tested (19), and at slide on rails.
3. the multi-functional automatic performance proving installation of a kind of Subzero valve according to claim 2, is characterized in that, size and shape and the valve to be tested (19) of 2 described V-blocks match.
4. the multi-functional automatic performance proving installation of a kind of Subzero valve according to claim 1, it is characterized in that, described upper cover (4) is provided with two technique consents, a technique stopple (22) for sealing respectively is provided with in each technique consent, before detection, two technique consents are opened, and insert flexible pipe wherein in a hole and connect Nitrogen source gases, air displacement in cryogenic box is gone out, then uses two technique stopple (22) seal and openings.
5. the multi-functional automatic performance proving installation of a kind of Subzero valve according to claim 4, it is characterized in that, described low temperature flow container (15) is connected to the technique consent on upper cover (4) by change-over switch, after discharging the gas in cryogenic box (21), switch the cryogenic liquid in low temperature flow container (15) to be pressed in cryogenic box by same pipeline by change-over switch and block technique stopple (22), after detection terminates, by vacuum pump (14) and pipeline of sobbing the cryogenic liquid in cryogenic box is recovered to low temperature flow container (15).
6. the multi-functional automatic performance proving installation of a kind of Subzero valve according to claim 1, it is characterized in that, setting pressure sensor (17) on the set bolt of described joint flange (18), test situation of change of bolt-locking power under the environment of low temperature, for the type selecting of erection bolt and locking provide design considerations.
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| CN201310522050.1A CN104568397B (en) | 2013-10-29 | 2013-10-29 | A kind of multi-functional automatic performance test device of Subzero valve |
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| CN201310522050.1A CN104568397B (en) | 2013-10-29 | 2013-10-29 | A kind of multi-functional automatic performance test device of Subzero valve |
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| CN104568397B CN104568397B (en) | 2017-10-20 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105758598A (en) * | 2016-04-22 | 2016-07-13 | 上海市特种设备监督检验技术研究院 | Low temperature test device of valve performance |
| CN106323557A (en) * | 2016-10-24 | 2017-01-11 | 河北科技大学 | Device and method for airtightness detection of pressure bearing parts in low-temperature environment |
| CN106556511A (en) * | 2016-11-24 | 2017-04-05 | 安徽皖拓自动化有限公司 | Valve low-temperature deep assay device cryogenic system based on liquid nitrogen refrigerant |
| CN106642994A (en) * | 2016-11-23 | 2017-05-10 | 安徽皖拓自动化有限公司 | Control system for cryogenic experiment device for low-temperature valve |
| CN108776014A (en) * | 2018-09-08 | 2018-11-09 | 江苏容大材料腐蚀检验有限公司 | Valve detection machine |
| CN108844732A (en) * | 2018-08-22 | 2018-11-20 | 邹凯 | A kind of detection device of polyethylene ball valve |
| CN108871741A (en) * | 2018-04-28 | 2018-11-23 | 上海齐耀动力技术有限公司 | A kind of Subzero valve low-temperature test clamping device and its method |
| CN111504632A (en) * | 2020-04-20 | 2020-08-07 | 上海发电设备成套设计研究院有限责任公司 | Valve lifting force measuring device and system and lifting force coefficient test method |
| CN112362339A (en) * | 2020-11-16 | 2021-02-12 | 上海廷本流体控制有限公司 | Life testing device for low-temperature valve with gas filling port |
| CN113029551A (en) * | 2021-04-13 | 2021-06-25 | 特技阀门集团有限公司 | Ultralow temperature valve test device |
| CN115683412A (en) * | 2021-07-21 | 2023-02-03 | 宝山钢铁股份有限公司 | Dynamic torque detection device and detection method for hysteresis coupling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108844732A (en) * | 2018-08-22 | 2018-11-20 | 邹凯 | A kind of detection device of polyethylene ball valve |
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| CN111504632A (en) * | 2020-04-20 | 2020-08-07 | 上海发电设备成套设计研究院有限责任公司 | Valve lifting force measuring device and system and lifting force coefficient test method |
| CN112362339A (en) * | 2020-11-16 | 2021-02-12 | 上海廷本流体控制有限公司 | Life testing device for low-temperature valve with gas filling port |
| CN112362339B (en) * | 2020-11-16 | 2023-09-26 | 上海廷本流体控制有限公司 | Life testing device for low-temperature valve with air filling port |
| CN113029551A (en) * | 2021-04-13 | 2021-06-25 | 特技阀门集团有限公司 | Ultralow temperature valve test device |
| CN113029551B (en) * | 2021-04-13 | 2024-05-07 | 特技阀门集团有限公司 | Ultralow temperature valve test device |
| CN115683412A (en) * | 2021-07-21 | 2023-02-03 | 宝山钢铁股份有限公司 | Dynamic torque detection device and detection method for hysteresis coupling |
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