CN101261185A - Gas spring environmental simulated fatigue-testing machine - Google Patents
Gas spring environmental simulated fatigue-testing machine Download PDFInfo
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- CN101261185A CN101261185A CNA2008100253086A CN200810025308A CN101261185A CN 101261185 A CN101261185 A CN 101261185A CN A2008100253086 A CNA2008100253086 A CN A2008100253086A CN 200810025308 A CN200810025308 A CN 200810025308A CN 101261185 A CN101261185 A CN 101261185A
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Abstract
The invention relates to an air spring environment simulation fatigue testing machine, comprising a frame, a box body component, a mechanical transmission device, a counterweight device, a hoisting disc and a transmission shaft; the box body component consists of a box body and a box door with heat preservation function; the mechanical transmission device is arranged on the frame and is positioned outside the box body; the motor of the mechanical transmission device is connected with a rotation disc by a reducer; the swing shaft which is arranged on the rotation disc is connected with a sliding block which is arranged in the guide trough of a swing rod; one end of the swing rod is articulated on the supporter of the swing rod; the transmission shaft with a tray is arranged inside the box body; the transmission shaft passes through the box body and is articulated with the other end of the swing rod; the hoisting disc is connected inside the box body and is corresponding to the transmission shaft; the counterweight bracket of the counterweight device is fixed on the top inside the box body; two disc bodies are coaxially arranged on the counterweight bracket; two ends of the steel cables which are arranged in two disc body ring-shaped trough are respectively connected on the counterweight block and the transmission shaft. The air spring environment simulation fatigue testing machine has reasonable structure, does not affect the actuating unit and the transmission mechanism of the testing machine or the service life of the transmission mechanism, and has the advantages of convenient operation and low energy loss.
Description
Technical field
The present invention relates to a kind of gas spring environmental simulated fatigue-testing machine, belong to the air spring technical field.
Background technology
The air spring simulated service testing machine is the duty of simulation air spring, whether can reach designing requirement to being tested by gas test spring again.Conventional simulated service testing machine only can at room temperature be simulated torture test, owing to can not carry out the test of the working environment of true air spring, and can't guarantee reliability and the permanance that air spring uses under the different temperatures environmental baseline.CN2615658Y disclosed " compressible air spring endurance test bed ", it is a kind of testing table that places in the large-scale environmental test chamber, form by adjustable frames, column, sample stent and simulation tailgate etc., its central post is fixedly welded on the base, sample stent is by being bolted on the column, and can prolong the column above-below direction and adjust; Transmission shaft links to each other with reductor by the reductor flange, the driving shaft that is connected with transmission shaft is connected with lower sprocket by spline, upper sprocket wheel then links to each other with door-hinge, door-hinge passes simulation tailgate and door counterweight counterweight, driving the simulation tailgate rotates around door-hinge, be connected with chain between lower sprocket and the upper sprocket wheel, be installed in respectively between sample stent and the simulation tailgate by the two ends of gas test spring, lower sprocket rotation in the motor via reducer rear drive, under the real work state, carried out the endurancing of various ambient temperature conditions with simulation by gas test spring, so that the test figure of accurate air spring to be provided.The simulated service testing machine of said structure is except that actuating unit, mechanical transmission mechanism, simulation tailgate and air spring all place in the large-scale environmental test chamber, because mechanical transmission mechanism adopts chain-drive mechanism, the alternation environment temperature also influences the serviceable life of actuating mechanisms such as chain-drive mechanism and simulation tailgate simultaneously.On the other hand, because this testing table need be placed in the large-scale environmental test chamber, reach the height alternating temperature-changing that test is set in the environmental test chamber as making, the heating and cooling time is longer in the chamber, so energy consumption is higher, therefore do not have a kind of under the alternation environment temperature, convenient at present to simulated the machine of torture test by gas test spring.
Summary of the invention
The purpose of this invention is to provide a kind of rational in infrastructurely, can not influence testing machine power and gear train serviceable life, and the low gas spring environmental simulated fatigue-testing machine of energy consumption.
Another object of the present invention provides a kind of convenient gas spring environmental simulated fatigue-testing machine of regulating tested air spring impulse stroke.
The present invention is that the technical scheme that achieves the above object is: a kind of gas spring environmental simulated fatigue-testing machine, it is characterized in that: comprise frame, box assembly, mechanical driving device, counter weight device, extension dish and transmission shaft, described box assembly is made of the casing of insulation and the chamber door that is installed on the casing; Described mechanical driving device is installed on the frame and is positioned at the outside of casing, mechanical driving device comprises motor, speed reduction unit and the toggle that is made of rotating disk, slide block and fork, motor is connected with rotating disk through speed reduction unit, the axis of swing that is installed on the rotating disk is connected with slide block, slide block is arranged in the gathering sill of fork, and an end of fork is hinged on the fork bearing; Transmission shaft with pallet is arranged in the casing, and transmission shaft to pass the other end of casing and fork hinged; It is interior and corresponding with transmission shaft that described extension dish is connected casing; Counter weight device comprises counterweight support, disk body, balancing weight and wirerope, and the counterweight support is fixed on the top in the casing, and amphidisc is coaxial to be installed on the counterweight support, and its two ends of wirerope that are arranged in the amphidisc annular groove are connected on balancing weight and the transmission shaft.
The present invention is that the technical scheme that reaches above-mentioned another purpose is: described rotating disk is provided with and is used to regulate the notch that axis of swing moves, the inner of axis of swing has the block of size greater than notch, axis of swing is arranged in this notch, and block and rotating disk inner face join, and the outside of axis of swing is connected with set nut, the openend of rotating disk notch is equipped with adjustment seat, and the adjuster bar that is installed on the adjustment seat is connected with axis of swing, and axis of swing is moved in the rotating disk notch.
The present invention is arranged on the outside of casing with motor, reductor and toggle, and only being provided with part in the casing can axially movable transmission shaft, extension dish and counter weight device, so alternating temperature-changing can not impact power and gear train in the casing.The present invention adopts the toggle that is made of rotating disk, slide block and fork, convert rotatablely moving of motor to transmission shaft multiple by toggle toward rectilinear motion, and can control by the speed of gas test spring reciprocation cycle by the control rotating speed of motor, because of transmission shaft only is to-and-fro movement up and down, so can also reduce the tolerance clearance between casing and the transmission shaft, make box assembly have the better seal effect, complete machine structure is very reasonable.The present invention is arranged on power and gear train the outside of casing, reduced the casing volume effectively, heating or cryogenic temperature in the casing can be controlled in+85 ℃～-45 ℃ between, the alternation temperature difference is big, and the casing volume is little, from normal temperature rise to+80 ℃ of used times are no more than 20 minutes, and reduce to-40 ℃ from normal temperature and are no more than 30 minutes, can conveniently control the temperature in the casing.Also because the casing volume is little, heating, energy consumption for cooling is low.Gas spring environmental simulated fatigue-testing machine of the present invention is simulated the air spring working condition under the bigger alternating temperature-changing of the temperature difference, can satisfy the requirement that accurate data were provided for the serviceable life of each parts of air spring.
The present invention regulates by adjuster bar and makes axis of swing along moving in the rotating disk notch, changes the axis of axis of swing and the distance of rotating disk axis, and the convenient experiment work stroke of regulating air spring is so can adapt to the tested air spring of different length.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is the structural representation of gas spring environmental simulated fatigue-testing machine of the present invention.
Fig. 2 is the sectional structure synoptic diagram of the A-A of Fig. 1.
Fig. 3 is the perspective view that gas spring environmental simulated fatigue-testing machine of the present invention removes casing and frame.
Fig. 4 is that the B of Fig. 3 is to perspective view.
Wherein: 1-swivel nut, 2-belt pulley, 3-counterweight support, 4-disk body, the 5-wirerope, the 6-balancing weight, 7-regulates screw mandrel, 8-extension dish, 9-is by gas test spring, 10-transmission shaft, 11-orienting sleeve, the 12-scale, 13-pivot pin, 14-frame, the 15-fork, 15-1-gathering sill, 16-axis of swing, the 17-set nut, 18-rotating disk, 18-1-notch, the 19-speed reduction unit, 20-motor, 21-fork bearing, the 22-casing, 23-heating and cooling device, 24-belt, the 25-motor cabinet, 26-adjusts motor, 27-chamber door, the 28-slide block, 29-adjustment seat, 30-adjuster bar.
Embodiment
See shown in Fig. 1～3 that gas spring environmental simulated fatigue-testing machine of the present invention comprises frame 14, box assembly, mechanical driving device, counter weight device, extension dish 8 and transmission shaft 10.See shown in Figure 1, box assembly of the present invention is made of the casing 22 of insulation and the chamber door 27 that is installed on the casing 22, box assembly is fixed on the frame 14, heating and cooling device 23 is installed in the casing 22, or heating and cooling device 23 is installed in outside the casing 22, and have ventilating opening on the casing 22, by control heating and cooling device 23 control in the casing 22 by the simulated environment temperature of gas test spring.
See shown in Fig. 1～3, mechanical driving device of the present invention is installed on the frame 14 and is positioned at the outside of casing 22, can be installed in the outer bottom of casing 22, this mechanical driving device comprises motor 20, speed reduction unit 19 and by rotating disk 18, the toggle that slide block 28 and fork 15 constitute, motor 20 adopts variable-frequency motor, the convenient working speed of regulating motor 20, the power output shaft of motor 20 is connected with speed reduction unit 19, the power output shaft of speed reduction unit 19 then is connected with rotating disk 18, axis of swing 16 is connected rotating disk 18,28 of slide blocks are arranged in the gathering sill 15-1 of fork 15, and the distance between axis of swing 16 axis and rotating disk 18 axis is by 1/2 impulse stroke of gas test spring 9, for ease of regulating by the impulse stroke of gas test spring 9, see Fig. 3, shown in 4, this rotating disk 18 is provided with and is used to regulate the notch 18-1 that axis of swing 16 moves, the inner of axis of swing 16 has the block of size greater than notch 18-1, axis of swing 16 is arranged in this notch 18-1, and the block of axis of swing 16 and rotating disk 18 inner faces join, the outside of axis of swing 16 then is connected with set nut 17, axis of swing 16 is installed on the rotating disk 18, and the openend of the notch 18-1 of rotating disk 18 also is equipped with adjustment seat 29, the adjuster bar 30 that is installed on the adjustment seat 29 is connected with axis of swing 16, adjuster bar 30 with screw thread is screwed in the screw in the adjustment seat 29, when unclamping set nut 17, regulating adjuster bar 30 moves, axis of swing 16 is moved in the notch 18-1 of rotating disk 18, distance between the axis of change axis of swing 16 and the axis of rotating disk 18, fork 15 pendulum angles are changed, and the reciprocating stroke of adjustment transmission shaft 10, one end of fork 15 is hinged on the fork bearing 21, fork bearing 21 is fixed on the frame 14, transmission shaft 10 with pallet is arranged in the casing 22, this pallet is provided with by the mount pad of gas test spring 9, and it is hinged with the other end of fork 15 that transmission shaft 10 passes casing 22.See shown in Fig. 3,4, be provided with orienting sleeve 11 between transmission shaft 10 and casing 22 and the frame 14, the outside that transmission shaft 10 is positioned at casing 22 is provided with groove, fork 15 is through in the groove of transmission shaft 10, make fork 15 and transmission shaft 10 hinged by pivot pin 13, on the frame 14 near transmission shaft 10 scale 12 is installed also, and pivot pin 13 has the pointer that extends to scale 12 index planes, convenient to being operated by the adjustment of gas test spring 9 tested strokes.
See shown in Fig. 1～3, extension dish 8 of the present invention is connected in the casing 22, extension dish 8 is corresponding with transmission shaft 10, preferably can be same axial line, for ease of installing by gas test spring 9, motor cabinet 25 is installed in the outer top of casing 22, adjusting motor 26 is installed on the motor cabinet 25, and the output panel of adjusting motor 26 is connected with swivel nut 1 by belt 24, belt pulley 2, regulate screw mandrel 7 and be installed in the swivel nut 1, be connected with extension dish 8, regulate screw mandrel 7 and extension dish 8 and also can be one-piece construction and regulate screw mandrel 7, by adjusting the rotation of motor 26, extension dish 8 is moved axially.
See shown in Fig. 1～3, counter weight device of the present invention comprises counterweight support 3, disk body 4, balancing weight 6 and wirerope 5, counterweight support 3 is fixed on the top in the casing 22, amphidisc 4 coaxial being installed on the counterweight support 3, two wireropes, 5 its two ends that are arranged in amphidisc 4 annular grooves are connected on balancing weight 6 and the transmission shaft 10, by the weight of this counter weight device, reduce driving moment.
During test, on 1 or many pallet that is installed in extension dish 8 and transmission shaft 10 by gas test spring 9, motor 20 drives speed reduction units 19 and drives the toggles action, when on the transmission shaft 10 during to motion, the weight of balancing weight 6 acts on transmission shaft 10 simultaneously by wirerope 5, and compression is by gas test spring 9; And after being finished by gas test spring 9 compressions, by gas test spring 9 under the effect of its spring force and toggle, when transmission shaft 10 moved downward, the weight of balancing weight 6 acted on transmission shaft 10 by wirerope 5 and cushioned this moment, with this back and forth to being carried out torture test by gas test spring 9.
Claims (7)
1, a kind of gas spring environmental simulated fatigue-testing machine, it is characterized in that: comprise frame (14), box assembly, mechanical driving device, counter weight device, extension dish (8) and transmission shaft (10), described box assembly is made of the casing (22) of insulation and the chamber door (27) that is installed on the casing (22); Described mechanical driving device is installed in the outside that frame (14) went up and be positioned at casing (22), mechanical driving device comprises motor (20), speed reduction unit (19) and the toggle that is made of rotating disk (18), slide block (28) and fork (15), motor (20) is connected with rotating disk (18) through speed reduction unit (19), the axis of swing (16) that is installed on the rotating disk (18) is connected with slide block (28), slide block (28) is arranged in the gathering sill (15-1) of fork (15), and an end of fork (15) is hinged on the fork bearing (21); Transmission shaft (10) with pallet is arranged in the casing (22), and transmission shaft (10) to pass the other end of casing (22) and fork (15) hinged; It is interior and corresponding with transmission shaft (10) that described extension dish (8) is connected casing (22); Counter weight device comprises counterweight support (3), disk body (4), balancing weight (6) and wirerope (5), counterweight support (3) is fixed on the top in the casing (22), amphidisc (4) is coaxial to be installed on the counterweight support (3), and its two ends of wirerope (5) that are arranged in amphidisc (4) annular groove are connected on balancing weight (6) and the transmission shaft (10).
2, gas spring environmental simulated fatigue-testing machine according to claim 1, it is characterized in that: described rotating disk (18) is provided with and is used to regulate the notch (18-1) that axis of swing (16) moves, the inner of axis of swing (16) has the block of size greater than groove (18-1), axis of swing (16) is arranged in this notch (18-1), and block and rotating disk (18) inner face joins, and the outside of axis of swing (16) is connected with set nut (17), the openend of rotating disk (18) groove (18-1) is equipped with adjustment seat (29), the adjuster bar (30) that is installed on the adjustment seat (29) is connected with axis of swing (16), and adjuster bar (30) control axis of swing (16) moves in rotating disk (18) groove (18-1).
3, gas spring environmental simulated fatigue-testing machine according to claim 1, it is characterized in that: described transmission shaft (10) is provided with groove, fork (15) is through in the groove of transmission shaft (10), fork (15) is hinged on the transmission shaft (10) by pivot pin (13), on the frame (14) near transmission shaft (10) scale (12) is installed also, and pivot pin (13) has the pointer that extends to scale (12) index plane.
4, gas spring environmental simulated fatigue-testing machine according to claim 1, it is characterized in that: described motor cabinet (25) is installed in the outer top of casing (22), adjusting motor (26) is installed on the motor cabinet (25), the output panel of adjusting motor (26) is fixedlyed connected with swivel nut (1) by belt (24), belt pulley (2), and the adjusting screw mandrel (7) that is connected with extension dish (8) is screwed in the swivel nut (1).
5, gas spring environmental simulated fatigue-testing machine according to claim 1 is characterized in that: be provided with orienting sleeve (11) between described transmission shaft (10) and casing (22) and the frame (14).
6, gas spring environmental simulated fatigue-testing machine according to claim 1 is characterized in that: heating and cooling device (23) is installed in the described casing (22).
7, gas spring environmental simulated fatigue-testing machine according to claim 1 is characterized in that: described heating and cooling device (23) is installed in casing (22) outside, and has ventilating opening on the casing (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810025308A CN100575903C (en) | 2008-04-28 | 2008-04-28 | Gas spring environmental simulated fatigue-testing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810025308A CN100575903C (en) | 2008-04-28 | 2008-04-28 | Gas spring environmental simulated fatigue-testing machine |
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| CN101261185A true CN101261185A (en) | 2008-09-10 |
| CN100575903C CN100575903C (en) | 2009-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810025308A Active CN100575903C (en) | 2008-04-28 | 2008-04-28 | Gas spring environmental simulated fatigue-testing machine |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411107A (en) * | 2011-12-03 | 2012-04-11 | 安徽省芜湖仪器仪表研究所 | Test bench used in instrument procedure filling and power-on fatigue test and test method thereof |
| CN102539140A (en) * | 2012-02-17 | 2012-07-04 | 浙江吉利汽车研究院有限公司 | Durability test bench for spring of wiper arm |
| CN103018025A (en) * | 2012-12-04 | 2013-04-03 | 宁波禾采医疗器械有限公司 | Air spring testing device |
| CN104374552A (en) * | 2013-08-14 | 2015-02-25 | 北汽福田汽车股份有限公司 | Gas spring durability test device |
| CN104897378A (en) * | 2014-11-26 | 2015-09-09 | 天津航天瑞莱科技有限公司苏州分公司 | Swing fatigue test device |
| CN105092232A (en) * | 2015-09-09 | 2015-11-25 | 宁波美亚达汽车部件制造有限公司 | Flexural fatigue inspection machine of air spring |
| CN105150439A (en) * | 2015-10-10 | 2015-12-16 | 中天科技装备电缆有限公司 | Film irradiation device |
| CN105181310A (en) * | 2015-08-10 | 2015-12-23 | 株洲时代新材料科技股份有限公司 | Air-spring mechanical property test device and experiment machine |
| CN105910801A (en) * | 2016-04-11 | 2016-08-31 | 常州气弹簧有限公司 | Air spring fatigue testing machine |
| CN106840625A (en) * | 2017-01-09 | 2017-06-13 | 河南平高电气股份有限公司 | A kind of slider-crank mechanism and the spring life test apparatus using the mechanism |
| CN107036805A (en) * | 2017-06-14 | 2017-08-11 | 苏州科技大学 | Spring anti-fatigue test equipment |
| CN107884207A (en) * | 2017-11-16 | 2018-04-06 | 江苏华淼电子科技有限公司 | A kind of Independent Suspension fatigue test monitor station |
| CN108088670A (en) * | 2017-11-29 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of low load fatigue test system of aircraft installation system |
| CN108760270A (en) * | 2018-06-14 | 2018-11-06 | 曾清民 | Gas spring tensile test device |
| CN109459251A (en) * | 2018-11-13 | 2019-03-12 | 江苏汤臣汽车零部件有限公司 | A kind of air-suspension bellows fatigue test system |
| CN109916614A (en) * | 2019-04-01 | 2019-06-21 | 南京兆能节能科技有限公司 | A kind of spring life test machine and its test method |
| CN110160766A (en) * | 2019-06-10 | 2019-08-23 | 华东交通大学 | A kind of adjustable flat spring fatigue experimental device |
| CN113532834A (en) * | 2021-08-03 | 2021-10-22 | 盐城新海川机电科技有限公司 | Special gas spring life test machine |
| CN113532834B (en) * | 2021-08-03 | 2024-04-26 | 东莞市腾飞五金模具有限公司 | Special machine for testing service life of gas spring |
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2008
- 2008-04-28 CN CN200810025308A patent/CN100575903C/en active Active
Cited By (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411107B (en) * | 2011-12-03 | 2013-08-14 | 安徽省芜湖仪器仪表研究所 | Test bench used in instrument procedure filling and power-on fatigue test and test method thereof |
| CN102411107A (en) * | 2011-12-03 | 2012-04-11 | 安徽省芜湖仪器仪表研究所 | Test bench used in instrument procedure filling and power-on fatigue test and test method thereof |
| CN102539140A (en) * | 2012-02-17 | 2012-07-04 | 浙江吉利汽车研究院有限公司 | Durability test bench for spring of wiper arm |
| CN103018025A (en) * | 2012-12-04 | 2013-04-03 | 宁波禾采医疗器械有限公司 | Air spring testing device |
| CN103018025B (en) * | 2012-12-04 | 2015-06-10 | 宁波禾采医疗器械有限公司 | Air spring testing device |
| CN104374552B (en) * | 2013-08-14 | 2017-02-15 | 北汽福田汽车股份有限公司 | gas spring durability test device |
| CN104374552A (en) * | 2013-08-14 | 2015-02-25 | 北汽福田汽车股份有限公司 | Gas spring durability test device |
| CN104897378A (en) * | 2014-11-26 | 2015-09-09 | 天津航天瑞莱科技有限公司苏州分公司 | Swing fatigue test device |
| CN104897378B (en) * | 2014-11-26 | 2017-09-29 | 天津航天瑞莱科技有限公司苏州分公司 | Swing fatigue experimental device |
| CN105181310A (en) * | 2015-08-10 | 2015-12-23 | 株洲时代新材料科技股份有限公司 | Air-spring mechanical property test device and experiment machine |
| CN105092232A (en) * | 2015-09-09 | 2015-11-25 | 宁波美亚达汽车部件制造有限公司 | Flexural fatigue inspection machine of air spring |
| CN105150439A (en) * | 2015-10-10 | 2015-12-16 | 中天科技装备电缆有限公司 | Film irradiation device |
| CN105910801A (en) * | 2016-04-11 | 2016-08-31 | 常州气弹簧有限公司 | Air spring fatigue testing machine |
| CN106840625A (en) * | 2017-01-09 | 2017-06-13 | 河南平高电气股份有限公司 | A kind of slider-crank mechanism and the spring life test apparatus using the mechanism |
| CN106840625B (en) * | 2017-01-09 | 2019-07-19 | 河南平高电气股份有限公司 | A kind of slider-crank mechanism and the spring life test apparatus using the mechanism |
| CN107036805A (en) * | 2017-06-14 | 2017-08-11 | 苏州科技大学 | Spring anti-fatigue test equipment |
| CN107884207A (en) * | 2017-11-16 | 2018-04-06 | 江苏华淼电子科技有限公司 | A kind of Independent Suspension fatigue test monitor station |
| CN107884207B (en) * | 2017-11-16 | 2019-08-30 | 徐州工业职业技术学院 | A kind of Independent Suspension fatigue test monitor station |
| CN108088670A (en) * | 2017-11-29 | 2018-05-29 | 中国航空工业集团公司沈阳飞机设计研究所 | A kind of low load fatigue test system of aircraft installation system |
| CN108760270A (en) * | 2018-06-14 | 2018-11-06 | 曾清民 | Gas spring tensile test device |
| CN109459251A (en) * | 2018-11-13 | 2019-03-12 | 江苏汤臣汽车零部件有限公司 | A kind of air-suspension bellows fatigue test system |
| CN109916614A (en) * | 2019-04-01 | 2019-06-21 | 南京兆能节能科技有限公司 | A kind of spring life test machine and its test method |
| CN110160766A (en) * | 2019-06-10 | 2019-08-23 | 华东交通大学 | A kind of adjustable flat spring fatigue experimental device |
| CN110160766B (en) * | 2019-06-10 | 2024-03-05 | 华东交通大学 | Adjustable plate spring fatigue test device |
| CN113532834A (en) * | 2021-08-03 | 2021-10-22 | 盐城新海川机电科技有限公司 | Special gas spring life test machine |
| CN113532834B (en) * | 2021-08-03 | 2024-04-26 | 东莞市腾飞五金模具有限公司 | Special machine for testing service life of gas spring |
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|---|---|
| CN100575903C (en) | 2009-12-30 |
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Application publication date: 20080910 Assignee: Changzhou gas spring Co., Ltd. Assignor: Shi Yuqiu Contract record no.: 2010320000047 Denomination of invention: Gas spring environmental simulated fatigue-testing machine Granted publication date: 20091230 License type: Exclusive License Record date: 20100220 |