CN108254183A - Crank connecting link loads the rolling bearing fatigue life test system of radially alternating load - Google Patents
Crank connecting link loads the rolling bearing fatigue life test system of radially alternating load Download PDFInfo
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- CN108254183A CN108254183A CN201711456437.6A CN201711456437A CN108254183A CN 108254183 A CN108254183 A CN 108254183A CN 201711456437 A CN201711456437 A CN 201711456437A CN 108254183 A CN108254183 A CN 108254183A
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- rolling bearing
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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Abstract
The rolling bearing fatigue life that radially alternating load is loaded the present invention relates to a kind of crank connecting link tests system, the system controls the rotation of driving motor by computer, drive rolling bearing rotation, in the radially alternating load loading unit of crank connecting link, the rotary motion of electric rotating machine is converted to by linear motion by crank linkage driving system, it can influence the stretching/compressing amount of spring, due to the change of the stretching/compressing amount of spring, spring can apply of different sizes on floating holder surface, the active force of direction-agile, the loading of the radially alternating load of bearing can be realized by adding multiple radially alternating load loading units of crank connecting link in floating holder different zones, torquemeter and temperature sensor are used for detecting the performance in rolling bearing operation process.Compared with prior art, the present invention, with reference to the real working condition condition of internal combustion engine, can carry out rolling bearing fatigue life test with the simple and convenient accurate loading for realizing the radially alternating load of rolling bearing.
Description
Technical field
The invention belongs to engine rolling bearing life testing fields, are related to a kind of crank connecting link and load radially alternating load
Rolling bearing fatigue life test system.
Background technology
Internal combustion engine is widely used in automobile, ship, aircraft, tank, railway locomotive, agricultural machinery, engineering machinery, power generation
Multiple industries such as unit, play a very important role as power-equipment in national economy.Include work in internal combustion engine
Plug-cylinder sleeve, piston ring-cylinder liner, bent axle-bearing and cam-tappet etc. are several to important friction pair, wherein, crankshaft bearing, including
Base bearing and the connecting-rod bearing (since the size and Orientation of such bearing working load all changes over time, are thus generically referred to as moving
Load bearings), it is one of the most key friction pair of internal combustion engine, it not only influences the reliability of internal combustion engine and tired longevity
Life, also affects the potentiality that internal combustion engine is further strengthened.
At present, car engine main bearing, camshaft bearing and connecting rod bottom-end bearing are few mainly using sliding bearing
The camshaft bearing of number engine employs rolling bearing.According to tribology theory, rolling friction is damaged than the energy of sliding friction
Small an order of magnitude or so is wanted in mistake.Therefore, under identical working condition, the friction loss of rolling bearing is much smaller than sliding axle
It holds, thus the important trial that bearing element chemical conversion lowers consumption for engine antifriction.
The fatigue life of rolling bearing and its reliability are the most important performance indicators of rolling bearing, but tired due to influencing
Labor factors of limit life is too many and bearing fatigue life theory still needs to perfect, and it is currently the only effective way to carry out life test.Axis
It is essential and basic important verification process in design bearing and manufacturing process to hold experiment.The loading load of test bearing is as axis
The important parameter of testing machine test is held, accuracy directly affects the result of the test of bearing.Rolling bearing experiment traditional at present
System loads characteristic is single, it is impossible to realize the loading of changeable load, and dynamic load rolling bearing is often in alternation in true internal combustion engine
Load, therefore traditional rolling bearing pilot system is difficult to carry out the experiment of engine dynamic load rolling bearing fatigue life.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of crank connecting link loads
The rolling bearing fatigue life test system of radially alternating load.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of crank connecting link loads the rolling bearing fatigue life test system of radially alternating load, for measuring the axis of rolling
The fatigue life under the effect of radially alternating load is held, the rolling bearing is distributed by outer ring, inner ring and by retainer
Multiple rolling elements composition between inner ring and outer ring, the system include,
Workbench,
Driving motor is connected on workbench,
Rotary shaft is sequentially connected with driving motor, and the rotary shaft is equipped with torquemeter,
Two stationary fixtures, are connected on workbench, and one is clamped in each stationary fixture and accompanies examination rolling bearing,
Floating holder between two stationary fixtures, divides fixture to form by two opposed activities, the activity folder
It is clamped at least one subject rolling bearing in tool, the subject rolling bearing and accompanies examination rolling bearing coaxial arrangement, and
It is arranged on the rotary shaft,
Temperature sensor is arranged in floating holder, and is contacted with subject rolling bearing,
The radially alternating load loading unit of crank connecting link, the charging assembly acted on floating holder by four form, respectively
Charging assembly is made of electric rotating machine, crank linkage driving system, load loading spring and the connector being sequentially connected successively, institute
The connector stated is connect with floating holder, and in " ten " set up of character patt ern, each load adds the load loading spring of four charging assemblies
The telescopic direction of spring is carried on direction radially of the axis of rotation, the crank linkage driving system by being sequentially connected successively
Runner, rocking bar and reciprocating lever composition, the reciprocating lever is arranged in the sleeve being fixed on workbench, and is being carried with sleeve
It is slidably connected in lotus loading spring telescopic direction, the free end of the reciprocating lever is connected by connecting plate and load loading spring
It connects, the runner is sequentially connected with electric rotating machine.
Preferably, the runner is gear type runner, is connected with and runner on the output shaft of the electric rotating machine
The worm screw that gear matches, the runner are sequentially connected by worm screw and electric rotating machine.
Preferably, on the runner radially be equipped with multiple bias rocking bar connection position, the rocking bar with it is past
Compound lever head and the tail are sequentially articulated and connected, and the free end of rocking bar is alternatively articulated and connected with rocking bar connection position.
Preferably, two subject rolling bearings are clamped in the floating holder.
Preferably, the floating holder divides fixture and lower activity that fixture is divided to form by upper activity opposed up and down, described
Upper activity divide fixture bottom be equipped with upper arc groove, the lower activity divide fixture top be equipped with lower arcuate slot, upper arc
Slot and lower arcuate slot match the clamping part for being combined into and matching with rolling bearing, and the radially alternating load loading of the crank connecting link is single
Member is made of upper charging assembly, lower charging assembly, left charging assembly and right charging assembly, and the upper charging assembly is arranged on
Activity divides the top of fixture and acts on the top that activity divides fixture, and the lower charging assembly is arranged on lower activity and divides fixture
Lower section and act on the bottom that lower activity divides fixture, the left charging assembly is arranged on the left side of floating holder and acts on
Upper activity divides fixture and lower activity divides the junction of fixture, and the right charging assembly is arranged on right side and the effect of floating holder
Fixture and lower activity is divided to divide the junction of fixture in upper activity.
Preferably, the temperature sensor is arranged in arc groove or lower arcuate slot, and with the outer ring of rolling bearing
Contact.
Preferably, the rotary shaft stated is sequentially connected by shaft coupling and driving motor.
Preferably, which further includes to communicate with driving motor, temperature sensor, torquemeter and electric rotating machine respectively and connect
The controller connect.
Preferably, which further includes for for examination rolling bearing and subject rolling bearing is accompanied to provide the confession oil machine of lubricating oil
Structure, the oil supply mechanism are connect with controller communication.
Computer controls the rotation of driving motor, drives rolling bearing with given rotation speed operation.In crank connecting link radially
In alternating load loading unit, the rotation of electric rotating machine is controlled by computer, will be revolved by crank linkage driving system
The rotary motion of rotating motor is converted to linear motion, can influence the stretching/compressing amount of spring.Due to the stretching/compressing of spring
The change of amount, spring will can apply of different sizes, direction-agile active force on floating holder surface.By in floating holder
Different zones, which add multiple radially alternating load loading units of crank connecting link, can realize the loading of bearing alternating load.Computer
The oil mass in rolling bearing operation process is controlled to supply by oil supply mechanism, torquemeter and temperature sensor can be used for detecting rolling
Performance in dynamic bearing operation process.
Compared with prior art, the invention has the advantages that：
(1) rotation angle of electric rotating machine is controlled by computer, and then changes compression/amount of tension of spring, controls bullet
The elastic force of spring can realize loading of the rolling bearing in the alternating load of two relative directions (such as upper and lower directions).
(2) with reference to the real working condition condition of internal combustion engine, rotation angle and the time of electric rotating machine are controlled by computer
Variable quantity can realize the loading of internal combustion engine real working condition load.Contribute to carry out the rolling of engine dynamic load using the test system
Dynamic bearing fatigue life test.
(3) by toggle, the loading of alternating load can be realized in one rotation direction of electric rotating machine, save
The step of having gone transformation electric rotating machine rotation direction, simply, reliably.
(4) by runner radially be equipped with multiple bias rocking bar connection position, a set of equipment can be passed through
Realize different degrees of load loading.
(5) by setting worm screw, self-locking can be realized, the reaction force for avoiding load loading spring loads standard to load
The influence of exactness and electric rotating machine run stability.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the schematic diagram of the radially alternating load loading unit of crank connecting link of the present invention.
In figure, 1 is computer, and 2 be driving motor, and 3 be shaft coupling, and 4 be torquemeter, and 5 be stationary fixture A, and 6 be for oil machine
Structure, 7 be the radially alternating load loading unit of crank connecting link, and 8 be floating holder, and 81 divide fixture for upper activity, and 82 be lower activity point
Fixture, 9 be stationary fixture B, and 10 be rotary shaft, and 11 is accompany examination rolling bearing B, and 12 roll for subject rolling bearing B, 13 for subject
Bearing A, 14 is accompany examination rolling bearing A, and 15 be workbench, and 16 be temperature sensor, and 17 be electric rotating machine A, and 181 be runner A,
182 be rocking bar A, and 183 be reciprocating lever A, and 184 be sleeve A, and 185 be connecting plate A, and 19 be load loading spring A, and 20 be connector
A, 21 be electric rotating machine B, and 221 be runner B, and 222 be rocking bar B, and 223 be reciprocating lever B, and 224 be sleeve B, and 225 be connecting plate B, 23
It is connector B for load loading spring B, 24,25 connector C, 26 be load loading spring C, and 27 be electric rotating machine C, and 281 is turn
C is taken turns, 282 be rocking bar C, and 283 be reciprocating lever C, and 284 be sleeve C, and 285 be connecting plate C, and 29 connector D, 30 load bullet for load
Spring D, 311 be runner D, and 312 be rocking bar D, and 313 be reciprocating lever D, and 314 be sleeve D, and 315 be connecting plate D, and 32 be electric rotating machine D.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of crank connecting link loads the rolling bearing fatigue life test system of radially alternating load, as shown in Fig. 1~2,
For measure rolling bearing radially alternating load effect under fatigue life, the rolling bearing by outer ring, inner ring and
The multiple rolling elements composition being distributed in by retainer between inner ring and outer ring,
The system includes,
Workbench 15,
Driving motor 2 is connected on workbench 15,
Rotary shaft 10 is sequentially connected with driving motor 2, is sequentially connected preferably by shaft coupling 3 and driving motor 2, rotation
Axis 10 is equipped with torquemeter 4,
Two stationary fixtures --- stationary fixture A5 and stationary fixture B9, is connected on workbench 15, stationary fixture A5
Inside be clamped with and accompany examination rolling bearing A14, be clamped in stationary fixture B9 and accompany examination rolling bearing B11, accompany examination rolling bearing A 14 with
Examination rolling bearing B 11 is accompanied to play the role of supporting rotary shaft 10.
Floating holder 8 does not contact between stationary fixture A5 and stationary fixture B9, and with the two, by opposed upper
Activity divides fixture A81 and lower activity that fixture B82 is divided to form, and at least one subject rolling bearing, this reality are clamped in floating holder 8
Applying clamping in example, there are two subject rolling bearings, are respectively tested rolling bearing A13 and subject rolling bearing B12, each subject rolling
Dynamic bearing and examination rolling bearing coaxial arrangement is accompanied, and is set in rotary shaft 10,
Temperature sensor 16 is arranged in floating holder 8, and is contacted with each subject rolling bearing,
The radially alternating load loading unit 7 of crank connecting link, the charging assembly acted on floating holder by four form, respectively
Charging assembly is made of electric rotating machine, crank linkage driving system, load loading spring and the connector being sequentially connected successively, institute
The connector stated is connect with floating holder, and in " ten " set up of character patt ern, each load adds the load loading spring of four charging assemblies
The telescopic direction of spring is carried on direction radially of the axis of rotation, the crank linkage driving system by being sequentially connected successively
Runner, rocking bar and reciprocating lever composition, the reciprocating lever is arranged in the sleeve being fixed on workbench 15, and is existed with sleeve
It is slidably connected in load loading spring telescopic direction, the free end of the reciprocating lever is connected by connecting plate and load loading spring
It connects, the runner is sequentially connected with electric rotating machine.
In the present embodiment, as shown in Fig. 2, floating holder divides fixture and lower activity to divide fixture structure by upper activity opposed up and down
Into, the upper activity divides the bottom of fixture to be equipped with upper arc groove, and the lower activity divides the top of fixture to be equipped with lower arcuate slot,
Upper arc groove and lower arcuate slot match the clamping part for being combined into and matching with rolling bearing, and temperature sensor 16 is arranged on arc groove
Or in lower arcuate slot, and contacted with the outer ring of rolling bearing.The radially alternating load loading unit 7 of crank connecting link is by upper loading group
Part, lower charging assembly, left charging assembly and right charging assembly are formed.
Upper charging assembly is arranged on activity and divides the top of fixture 81 and act on the top that activity divides fixture 81, by according to
Electric rotating machine A17, crank linkage driving system A, load loading spring A19 and the connector A20 compositions of secondary drive connection, crank
Jointed gear unit A is made of the runner A181, rocking bar A182 and reciprocating lever A183 being sequentially connected successively, and reciprocating lever A183 is worn
It is slided in load loading spring A19 telescopic direction in the sleeve A184 being fixed on workbench 15, and with sleeve A184
Connection, the free end of reciprocating lever A183 are connect by connecting plate A185 with load loading spring A19, runner A181 and electric rotating machine
A17 is sequentially connected.Left charging assembly, which is arranged on the left side of floating holder 8 and acts on activity, divides fixture 81 and lower activity point folder
Tool 82 junction, by be sequentially connected successively electric rotating machine B21, crank linkage driving system B, load loading spring B23 and
Connector B24 is formed, and crank linkage driving system B is by the runner B221, rocking bar B222 and reciprocating lever B223 that are sequentially connected successively
Composition, reciprocating lever B223 are arranged in the sleeve B224 being fixed on workbench 15, and load bullet in load with sleeve B224
It is slidably connected in spring B23 telescopic direction, the free end of reciprocating lever B223 is connected by connecting plate B225 and load loading spring B23
It connects, runner B221 and electric rotating machine B21 is sequentially connected.Right charging assembly is arranged on the right side of floating holder 8 and acts on work
It is dynamic that fixture 81 and lower activity is divided to divide the junction of fixture 82, by be sequentially connected successively electric rotating machine C27, crank connecting link driver
Structure C, load loading spring C26 and connector C25 composition, crank linkage driving system C by be sequentially connected successively runner C281,
Rocking bar C282 and reciprocating lever C283 compositions, reciprocating lever C283 are arranged in the sleeve C 284 being fixed on workbench 15, and with
Sleeve C 284 is slidably connected in load loading spring C26 telescopic direction, and the free end of reciprocating lever C283 passes through connecting plate C285
It is connect with load loading spring C26, runner C281 and electric rotating machine C27 is sequentially connected.Lower charging assembly is arranged on activity point
The lower section of fixture 81 simultaneously acts on the bottom that lower activity divides fixture 81, by electric rotating machine A32, the crank connecting link being sequentially connected successively
Transmission mechanism A, load loading spring A30 and connector A29 compositions, crank linkage driving system A are turned by what is be sequentially connected successively
A311, rocking bar A312 and reciprocating lever A313 compositions are taken turns, reciprocating lever A313 is arranged in the sleeve A314 being fixed on workbench 15
In, and be slidably connected in load loading spring A30 telescopic direction with sleeve A314, the free end of reciprocating lever A313 passes through connection
Plate A315 is connect with load loading spring A30, and runner A311 and electric rotating machine A32 is sequentially connected.In the present embodiment, each runner is equal
For gear type runner, electric rotating machine A, electric rotating machine B, electric rotating machine C and electric rotating machine D output shaft on further respectively have and phase
Worm screw A, worm screw B, worm screw C and the worm screw D that the runner answered matches, each runner are passed respectively by corresponding worm screw and electric rotating machine
Dynamic connection.In this implementation, the rocking bar connection position of multiple bias is radially equipped on each runner, rocking bar and reciprocating lever head and the tail are suitable
Secondary articulated connection, the free end of rocking bar are alternatively articulated and connected with rocking bar connection position.
The system further includes controller, controller respectively with driving motor, temperature sensor, torquemeter and electric rotating machine
Communication connection, temperature sensor 16 and torquemeter 4 can acquire the signal in rolling bearing operation process, monitor rolling bearing
Operational situation, controller can be computer 1.The system is further included for for examination rolling bearing and subject rolling bearing is accompanied to provide
The oil supply mechanism of lubricating oil, the oil supply mechanism are connect with controller communication, and oil supply mechanism 6 is connect with controller communication, real
Now to the fuel feeding of rolling bearing.
Computer controls the rotation of driving motor, drives rolling bearing with given rotation speed operation.In crank connecting link radially
In alternating load loading unit, the rotation of electric rotating machine is controlled by computer, will be revolved by crank linkage driving system
The rotary motion of rotating motor is converted to linear motion, can influence the stretching/compressing amount of spring.Due to the stretching/compressing of spring
The change of amount, spring will can apply of different sizes, direction-agile active force on floating holder surface.By in floating holder
Different zones, which add multiple radially alternating load loading units of crank connecting link, can realize the loading of bearing alternating load.Computer
The oil mass in rolling bearing operation process is controlled to supply by oil supply mechanism, torquemeter and temperature sensor can be used for detecting rolling
Performance in dynamic bearing operation process.
The above-mentioned description to embodiment is for ease of ordinary skill in the art to understand and use the invention.It is ripe
The personnel for knowing art technology obviously can easily make these embodiments various modifications, and general original described herein
It ought to use in other embodiment without having to go through creative labor.Therefore, the present invention is not limited to above-described embodiment, this fields
Technical staff's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be in the guarantors of the present invention
Within the scope of shield.
Claims (9)
1. a kind of crank connecting link loads the rolling bearing fatigue life test system of radially alternating load, for measuring rolling bearing
Fatigue life under the effect of radially alternating load, the rolling bearing are distributed in by outer ring, inner ring and by retainer
Multiple rolling elements composition between inner ring and outer ring, which is characterized in that the system includes,
Workbench,
Driving motor is connected on workbench,
Rotary shaft is sequentially connected with driving motor, and the rotary shaft is equipped with torquemeter,
Two stationary fixtures, are connected on workbench, and one is clamped in each stationary fixture and accompanies examination rolling bearing, activity folder
Tool, between two stationary fixtures, divides fixture to form, is clamped at least in the floating holder by two opposed activities
One subject rolling bearing, the subject rolling bearing and accompanies examination rolling bearing coaxial arrangement, and is set in rotary shaft
On,
Temperature sensor is arranged in floating holder, and is contacted with subject rolling bearing,
The radially alternating load loading unit of crank connecting link, the charging assembly acted on floating holder by four form, each to load
Component is made of electric rotating machine, crank linkage driving system, load loading spring and the connector being sequentially connected successively, described
Connector is connect with floating holder, and for the load loading spring of four charging assemblies in " ten " set up of character patt ern, each load loads bullet
On direction radially of the axis of rotation, the crank linkage driving system is turned the telescopic direction of spring by what is be sequentially connected successively
Wheel, rocking bar and reciprocating lever composition, the reciprocating lever are arranged in the sleeve being fixed on workbench, and with sleeve in load
It being slidably connected in loading spring telescopic direction, the free end of the reciprocating lever is connect by connecting plate with load loading spring,
The runner is sequentially connected with electric rotating machine.
2. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the runner is gear type runner, the gear with runner is connected on the output shaft of the electric rotating machine
The worm screw to match, the runner are sequentially connected by worm screw and electric rotating machine.
3. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the rocking bar connection position of multiple bias, the rocking bar and reciprocating lever are radially equipped on the runner
Head and the tail are sequentially articulated and connected, and the free end of rocking bar is alternatively articulated and connected with rocking bar connection position.
4. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, two subject rolling bearings are clamped in the floating holder.
5. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the floating holder divides fixture and lower activity that fixture is divided to form by upper activity opposed up and down, described is upper
Activity divide fixture bottom be equipped with upper arc groove, the lower activity divide fixture top be equipped with lower arcuate slot, upper arc groove and
Lower arcuate slot, which is matched, is combined into the clamping part that matches with rolling bearing, the radially alternating load loading unit of the crank connecting link by
Upper charging assembly, lower charging assembly, left charging assembly and right charging assembly are formed, and the upper charging assembly is arranged on activity
Divide the top of fixture and act on the top that activity divides fixture, the lower charging assembly is arranged on lower activity and divides under fixture
Side simultaneously acts on the bottom that lower activity divides fixture, and the left charging assembly is arranged on the left side of floating holder and acts on work
Dynamic that fixture and lower activity is divided to divide the junction of fixture, the right charging assembly is arranged on the right side of floating holder and acts on
Activity divides fixture and lower activity to divide the junction of fixture.
6. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the temperature sensor is arranged in arc groove or lower arcuate slot, and contacted with the outer ring of rolling bearing.
7. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the rotary shaft stated is sequentially connected by shaft coupling and driving motor.
8. crank connecting link according to claim 1 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the system further includes what is connected respectively with the communication of driving motor, temperature sensor, torquemeter and electric rotating machine
Controller.
9. crank connecting link according to claim 8 loads the rolling bearing fatigue life test system of radially alternating load,
It is characterized in that, the system is further included for providing the oil supply mechanism of lubricating oil to accompany examination rolling bearing and being tested rolling bearing,
The oil supply mechanism is connect with controller communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456437.6A CN108254183A (en) | 2017-12-28 | 2017-12-28 | Crank connecting link loads the rolling bearing fatigue life test system of radially alternating load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711456437.6A CN108254183A (en) | 2017-12-28 | 2017-12-28 | Crank connecting link loads the rolling bearing fatigue life test system of radially alternating load |
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| Publication Number | Publication Date |
|---|---|
| CN108254183A true CN108254183A (en) | 2018-07-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711456437.6A Withdrawn CN108254183A (en) | 2017-12-28 | 2017-12-28 | Crank connecting link loads the rolling bearing fatigue life test system of radially alternating load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503330A (en) * | 2021-06-29 | 2021-10-15 | 上海宇航系统工程研究所 | Long-life planar spiral spring for space |
| CN118150168A (en) * | 2024-05-11 | 2024-06-07 | 天津圣金特汽车配件有限公司 | Aluminum alloy die casting quality detection device |
-
2017
- 2017-12-28 CN CN201711456437.6A patent/CN108254183A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113503330A (en) * | 2021-06-29 | 2021-10-15 | 上海宇航系统工程研究所 | Long-life planar spiral spring for space |
| CN118150168A (en) * | 2024-05-11 | 2024-06-07 | 天津圣金特汽车配件有限公司 | Aluminum alloy die casting quality detection device |
| CN118150168B (en) * | 2024-05-11 | 2024-07-02 | 天津圣金特汽车配件有限公司 | Aluminum alloy die casting quality detection device |
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Application publication date: 20180706 |