CN114152535B - Bearing fretting wear testing machine - Google Patents
Bearing fretting wear testing machine Download PDFInfo
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- CN114152535B CN114152535B CN202210120084.7A CN202210120084A CN114152535B CN 114152535 B CN114152535 B CN 114152535B CN 202210120084 A CN202210120084 A CN 202210120084A CN 114152535 B CN114152535 B CN 114152535B
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- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 32
- 230000005540 biological transmission Effects 0.000 claims abstract description 8
- 239000004519 grease Substances 0.000 claims description 16
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 description 7
- 230000033001 locomotion Effects 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000013100 final test Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a bearing fretting wear testing machine which comprises an eccentric connecting rod driving mechanism, a swing arm mechanism and a clamp carrier seat used for positioning a clamp, wherein the swing arm mechanism comprises a swing arm and a shifting fork, the lower end of the swing arm is rotatably arranged on the clamp carrier seat, the upper end of the swing arm is in transmission connection with a connecting rod of the eccentric connecting rod driving mechanism, and the shifting fork is in transmission connection with the swing arm and clamps and embeds the swing arm of the clamp in the shifting fork. According to the bearing fretting wear testing machine, the swing arm mechanism is added through the swing arm, so that the swing bearing seat is prevented from bearing more additional load, and the testing result is ensured to be more accurate.
Description
Technical Field
The invention relates to a testing machine, in particular to a testing machine for measuring fretting wear of a bearing.
Background
Fretting wear is a very small amplitude of motion that occurs between two contacting surfaces. Fretting friction can not only lead to frictional wear between the contacting surfaces, but also accelerate crack generation and propagation, ultimately leading to a significant reduction in the fatigue life of the component. Currently, damage due to fretting friction is quite common in the industrial field. Fretting wear is commonly found in fastening assemblies in the mechanical industry, nuclear reactors, aerospace, industrial robots, bridges, automobiles, ships, railways, and other fields. Bearings play a very critical role in the industrial field as important basic components and fastening fittings. Therefore, the bearing fretting wear is further deeply researched by measuring the bearing fretting wear, so that the method has important guiding significance for preventing and controlling industrial fretting damage and has wide engineering application prospect.
SH/T07162002 'method for measuring the fretting wear resistance of lubricating grease', it includes frame, motor and clamp, the clamp includes clamp head, clamp base, swing bearing seat fixed with rocker arm, etc., utilize eccentric link mechanism to change the motor rotation into the driving force of the swing bearing, provide the micro-motion drive, but the existing experimental machine still has the defects of short service life and relatively large error.
Disclosure of Invention
In order to realize the application in the background technology, the invention discloses a bearing fretting wear testing machine which can be used for evaluating the fretting wear resistance of lubricating grease when a bearing swings.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bearing fretting wear testing machine comprises an eccentric connecting rod driving mechanism, a swing arm mechanism and a clamp carrier seat for positioning a clamp,
the swing arm mechanism comprises a swing arm and a shifting fork, the lower end of the swing arm is rotatably arranged on the clamp carrier seat, the upper end of the swing arm is in transmission connection with a connecting rod of the eccentric connecting rod driving mechanism, and the shifting fork is in transmission connection with the swing arm and clamps the rocker arm of the clamp.
As one embodiment, the lower end of the swing arm is connected with a vertical lower shaft constructed at the bottom of the clamp carrier seat through a bearing, the upper end of the swing shaft is vertically fixed with a swing shaft connected with a connecting rod through a joint bearing, and the shifting fork is fixedly arranged at the top of the swing shaft.
As one embodiment, the eccentric link driving mechanism includes a vertically disposed motor, an eccentric shaft directly connected to the motor, and the link, which is connected to the eccentric shaft through a bearing.
As one of the embodiments, the upper portion of the eccentric shaft is configured with a disk to increase the moment of inertia, and the bottom of the eccentric shaft is loaded with a clump weight.
As one embodiment, the top of the clamp is provided with a ring groove to facilitate hand holding.
As one embodiment, the clamp further comprises a quick fastening mechanism to realize the quick assembly and disassembly of the clamp relative to the clamp carrier.
As one embodiment, the quick fastening mechanism includes a locking cavity configured on one side of the fixture assembly cavity of the fixture carrier, a positioning block horizontally penetrating the assembly cavity and the cavity wall of the locking cavity, and a wedge block movably disposed in the locking cavity up and down to drive the positioning block to press or release the fixture, wherein the end of the locking cavity of the positioning block is an arc surface matched with the fixture, and the end of the locking cavity of the positioning block is a wedge surface.
As one embodiment, the positioning block comprises an upper pressing block and a lower pressing block, the wedge block comprises an upper wedge block and a lower wedge block, a screw for connecting the upper wedge block and the lower wedge block, and a pressure spring sleeved on the screw.
As one embodiment, the connecting rod is hollow.
The beneficial effects of the invention are as follows:
the bearing fretting wear testing machine provided by the invention has the advantages that the swing arm mechanism is additionally arranged on the swing arm, so that the swing bearing seat is prevented from bearing more additional load, the test result is ensured to be more accurate, the rotating shaft of the swing arm is arranged on the lower shaft of the clamp bearing seat, the lower shaft and the clamp shaft of the clamp are preferably coaxially arranged, the bearing seat can be effectively prevented from bearing loads in other directions, and the final test effect is ensured.
Drawings
FIG. 1 is a three-dimensional schematic of the present invention.
FIG. 2 is a schematic diagram of a host computer of the present invention in three views.
Fig. 3 is a schematic sectional view a-a of fig. 2.
Fig. 4 illustrates a schematic sectional view B-B of fig. 2.
Fig. 5 is a schematic view showing a part i of fig. 3 enlarged.
Fig. 6 is a schematic enlarged view of part ii of fig. 3.
Fig. 7 is a partially enlarged view of fig. 4 showing iii.
In the figure: 1. a frame; 2. a motor; 3. an eccentric shaft; 4. a first bearing; 5. a connecting rod; 6. a counterbalance; 7. a second bearing; 8. a shaft sleeve; 9. a shifting fork; 10. a swing rod; 11. swinging arms; 12. a clamp head; 13. a clamp shaft; 14. a screw; 15. an upper wedge block; 16. pressing the blocks; 17. a pressure spring; 18. pressing the block; 19. a lower wedge block; 20. locking the nut; 21. a third bearing; 22. a lower shaft; 23. a clamp body; 24. swinging the bearing seat; 25. a pendulum shaft; 26. and (4) a clamp base.
Detailed Description
The present invention will be explained in more detail by the following examples, which are intended to disclose all changes and modifications within the scope of the present invention, and the present invention is not limited to the following examples;
the bearing fretting wear testing machine described in conjunction with the attached figures 1-7 comprises an eccentric connecting rod driving mechanism, a swing arm mechanism and a clamp carrier seat for positioning a clamp,
the swing arm mechanism comprises a swing arm and a shifting fork, the lower end of the swing arm is rotatably arranged on the clamp carrier seat, the upper end of the swing arm is in transmission connection with a connecting rod of the eccentric connecting rod driving mechanism, and the shifting fork is used for clamping and embedding the rocker arm of the clamp and is in transmission connection with the swing arm. The eccentric connecting rod driving mechanism comprises a vertically arranged motor, an eccentric shaft directly connected with the motor and the connecting rod, wherein the connecting rod is connected with the eccentric shaft through a bearing.
Specifically, the appearance of a main machine of the bearing fretting wear testing machine is of a table-type structure, a rack 1 is of a table shape, a motor 2 is arranged on a table surface of the rack 1, the lower end of the motor 2 is directly connected with an eccentric shaft 3, and the eccentric shaft 3 is provided with a connecting rod 5 through a bearing II 7. The motor 2 is vertically arranged, so that the eccentric shaft 3, the connecting rod 5 and the pendulum shaft 25 driven by the motor form a reasonable eccentric connecting rod mechanism. The eccentric shaft 3 is fitted into a bearing 4 to reduce the radial load of the motor.
The lower end of the swing arm is connected with a vertical lower shaft constructed at the bottom of the clamp carrier seat through a bearing, a swing shaft connected with a connecting rod through a shaft sleeve 8 is vertically fixed at the upper end of the swing shaft, and the shifting fork is fixedly arranged at the top of the swing shaft. The bushing 8 is a joint bearing structure to offset the position error. Namely, the other end of the connecting rod 5 is connected with a swing shaft 25, the swing shaft 25 is arranged on a swing arm 11, the swing arm 11 is arranged on a lower shaft 22 through a bearing III 21, the lower shaft 22 is fixedly arranged on a clamp body 23, and the clamp body 23 is fixedly arranged on the frame 1; the test fixture of the bearing fretting wear testing machine comprises a fixture body 23, a fixture head 12, a fixture shaft 13, a swing bearing seat 24, a fixture base 26 and a locking nut 20 at the bottom of the fixture shaft 13. There are also two thrust ball bearings on the clamp shaft for testing. The test fixture is similar to the structure described in SH/T07162002 & lt & gt lubricating grease fretting wear resistance performance measurement method & gt, and details are omitted, wherein the swing bearing seat 24 is provided with the swing rod 10, the swing rod 10 is clamped in a fork of the shifting fork 9, and the shifting fork 9 is arranged at the upper end of the swing shaft 25.
The bearing fretting wear testing machine provided by the invention has the advantages that the swing arm mechanism is additionally arranged on the swing arm 11, so that the swing bearing seat 24 is prevented from bearing more additional load, the test result is ensured to be more accurate, the rotating shaft of the swing arm is arranged on the lower shaft of the clamp bearing seat, the lower shaft and the clamp shaft of the clamp are preferably coaxially arranged, the bearing seat can be effectively prevented from bearing loads in other directions, and the final test effect is ensured.
The specific work of the testing machine is as follows: the eccentric shaft 3 is driven by the motor 2 to rotate, the eccentric shaft 3 drives the swing shaft 25 to swing through the connecting rod 5, the shifting fork 9 on the swing shaft 25 shifts the swing rod 10, the swing rod 10 drives the swing bearing seat 24 to swing in a reciprocating mode, two sets of thrust ball bearings filled with test grease make reciprocating swing motion under the conditions that the radian is 0.21, the swing frequency is 30.0Hz, the load is 2450N and the room temperature is reached, and the test time is 22 h. The fretting wear resistance of the grease was evaluated as the average of the sum of the mass losses of the two sets of bearing races over a set time. And testing the fretting wear resistance of the lubricating grease.
Further, the upper portion of the eccentric shaft is configured with a disk to increase the moment of inertia, and the bottom portion is loaded with a clump weight. So as to increase the rotational inertia, resist the impact and ensure the smooth operation. Meanwhile, the top of the clamp is provided with a ring groove so as to be convenient for holding.
As a further optimization of the invention, the bearing fretting wear testing machine further comprises a quick fastening mechanism to realize quick assembly and disassembly of the clamp, wherein the quick fastening mechanism comprises a locking cavity constructed on one side of a clamp assembling cavity of the clamp carrier seat, a positioning block horizontally penetrating through the assembling cavity and the cavity wall of the locking cavity, and a wedge block which can be vertically and vertically arranged in the locking cavity to drive the positioning block to press or release the clamp, the locking cavity end of the positioning block is a cambered surface matched with the clamp, the locking cavity end of the positioning block is a wedge surface, the locking cavity is preferably a square or other non-circle-center symmetrical structure, so that the wedge block can only move up and down, the wedge block is a block-shaped structure, the wedge surface is arranged at the position matched with the positioning block to realize that the up-down movement of the wedge block is converted into the horizontal movement of the positioning block by utilizing the matching of the wedge surface, and locking and positioning in the horizontal direction are realized.
Furthermore, the positioning block comprises an upper pressing block and a lower pressing block, the wedge block comprises an upper wedge block, a lower wedge block, a screw for connecting the upper wedge block with the lower wedge block, and a pressure spring sleeved on the screw. The upper pressing block and the lower pressing block are used for positioning, so that the whole stable positioning can be realized for the upper part and the lower part of the clamp. As a specific embodiment, the quick fastening mechanism comprises a screw 14, an upper wedge 15, an upper pressing block 16, a pressure spring 17, a lower pressing block 18 and a lower wedge 19; an upper wedge block 15 and a lower wedge block 19 are vertically arranged in a clamp body 23, a pressure spring 17 is arranged between the upper wedge block 15 and the lower wedge block 19, a screw 14 penetrates through the middle of the upper wedge block 15 and the lower wedge block 19, an upper pressing block 16 is arranged in a transverse hole of the upper wedge block 15, the transverse hole is a hole formed in the upper wedge block 15, the hole is perpendicular to the axis of the upper wedge block 15, and therefore the transverse hole is called as a transverse hole, and the lower wedge block is similar. The inclined plane of the upper pressing block 16 is matched with the wedge surface of the upper wedge block 15, the cambered surface of the upper pressing block 16 is attached to the cylindrical surface of the clamp head 12, the lower pressing block 18 is arranged in the transverse hole of the lower wedge block 19, the inclined plane of the lower pressing block 18 is matched with the wedge surface of the lower wedge block 19, and the cambered surface of the lower pressing block 18 is attached to the clamp base 26; when the screw 14 is locked, the wedge surfaces of the upper wedge 15 and the lower wedge 19 respectively act with the upper pressing block 16 and the lower pressing block 18, so that the clamp head 12 and the clamp base 26 are locked, when the screw 14 is loosened, the clamp head 12 and the clamp base 26 are loosened under the action of the pressure spring 17, a vertical locking mode which is similar up and down is adopted, the verticality of clamp positioning can be effectively ensured, and the influence on the experimental effect caused by axial inclination due to clamping operation is avoided.
The specific operation process is as follows:
1) the bearing fretting wear testing machine is characterized in that lubricating grease is filled into a test bearing in a clamp before a test, and the test lubricating grease is filled into two sets of unused, cleaned and weighed bearings in a clean environment;
2) the test grease was filled into the ball raceways of the bearing races. The grease is applied with a suitable scraper to be level with the bearing step. And the bearing back and bearing seat must be guaranteed to be free of grease and particulate impurities. A piece of lint-free rag can be used for wetting n-heptane and then lightly scrubbing;
3) all gaps around the steel balls on both sides of the retainer are carefully filled with test grease. And scrape off excess grease on the cage holes and sides, but allow the concave sides to retain excess grease. The amount of greasing per bearing is required to be controlled within the range of 1.0. + -. 0.05 g.
The fixture clamping step of the bearing fretting wear testing machine comprises the following steps: the upper bearing top ring is installed into the fixture head and the set screw is tightened with minimal force. The clamp head 12 is placed upside down into the vise for clamping, and the upper bearing retainer is placed onto the top race of the clamp head with the concave side facing up during assembly. The upper bearing base ring is installed into the swing bearing block 24 and the set screws are tightened. The lower bearing top race is arranged in the swing bearing seat 24, and the fixing screw is screwed down; the swing bearing block 24 is mounted on the clamp shaft 13 to facilitate proper upper bearing assembly. The lower bearing retainer is placed on the race in the swing bearing seat 24 with the concave surface facing upward. The lower bearing base ring is installed into the clamp base 26, the fixing screws are tightened, and the clamp base 26 is installed onto the clamp shaft 13. The spring guide cylinder, spring, spacer, washer and lock nut are mounted on the shaft in order, and the clamp base 26 and swing bearing block 24 are held by hand to prevent rotation. The lock nut 20 is tightened until the bottom of the diaphragm rests on the shoulder. A thin layer of lubricating grease is smeared on the surface of the clamp in contact with the cavity, the clamp is stably installed into the cavity, and the clamp is fixed by using a quick fastening mechanism.
4) Calculating;
and respectively calculating the mass loss of the upper bearing race and the lower bearing race, and not including the mass loss of the steel ball and the retainer. And then calculating the average value of the mass loss of the bearing races of the upper set and the lower set. In mg units, to the nearest 0.1 mg as test results.
The present invention is not described in detail in the prior art, and therefore, the present invention is not described in detail.
Claims (7)
1. The utility model provides a bearing fretting wear testing machine which characterized in that: comprises an eccentric connecting rod driving mechanism, a swing arm mechanism and a clamp carrier seat used for positioning a clamp,
the swing arm mechanism comprises a swing arm and a shifting fork, the lower end of the swing arm is rotatably arranged on the clamp carrier seat, the upper end of the swing arm is in transmission connection with a connecting rod of an eccentric connecting rod driving mechanism, the shifting fork is in transmission connection with the swing arm and clamps and embeds the rocker arm of the clamp in the shifting fork, the eccentric connecting rod driving mechanism comprises a vertically arranged motor, an eccentric shaft directly connected with the motor and the connecting rod, and the connecting rod is connected with the eccentric shaft through a bearing; the lower end of the swing arm is connected with a vertical lower shaft constructed at the bottom of the clamp carrier seat through a bearing, the upper end of the swing arm is vertically fixed with a swing shaft connected with a connecting rod through a joint bearing, and the shifting fork is fixedly arranged at the top of the swing shaft;
the rotating shaft of the swing arm is arranged on the lower shaft of the clamp carrier seat, the lower shaft is coaxial with the clamp shaft of the clamp, the eccentric shaft drives the swing shaft to swing through the connecting rod, the shifting fork on the swing shaft stirs the swing rod, and the swing rod drives the swing bearing seat to swing in a reciprocating mode to enable the thrust ball bearing filled with the test grease to swing in a reciprocating mode.
2. The bearing fretting wear tester as claimed in claim 1, wherein the eccentric shaft is configured with a disc at its upper part to increase the moment of inertia and a weight is loaded at its bottom part.
3. The bearing fretting wear tester according to claim 1, wherein the top of the clamp is provided with a ring groove for easy handling.
4. The bearing fretting wear tester of claim 1, further comprising a quick-set mechanism to enable quick disassembly of the fixture relative to the fixture carrier.
5. The bearing fretting wear testing machine of claim 4, wherein the fast tightening mechanism comprises a locking cavity configured at one side of the fixture assembling cavity of the fixture carrier, a positioning block horizontally penetrating the assembling cavity and the cavity wall of the locking cavity, and a wedge block movably arranged in the locking cavity up and down to drive the positioning block to press or release the fixture, wherein the end of the locking cavity of the positioning block is an arc surface matched with the fixture, and the end of the locking cavity of the positioning block is a wedge surface.
6. The bearing fretting wear tester according to claim 5, wherein the positioning block comprises an upper pressing block and a lower pressing block, the wedge block comprises an upper wedge block and a lower wedge block, a screw connecting the upper wedge block and the lower wedge block, and a compression spring sleeved on the screw.
7. The bearing fretting wear tester of claim 4, wherein the connecting rod is hollow in shape.
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CN202210120084.7A CN114152535B (en) | 2022-02-09 | 2022-02-09 | Bearing fretting wear testing machine |
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CN202210120084.7A CN114152535B (en) | 2022-02-09 | 2022-02-09 | Bearing fretting wear testing machine |
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CN114152535B true CN114152535B (en) | 2022-05-13 |
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CN114486600B (en) * | 2022-04-18 | 2022-07-05 | 齐鲁工业大学 | Stepless variable-load axial loading system and bearing fretting wear testing machine |
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GB759091A (en) * | 1954-05-31 | 1956-10-10 | Licencia Talalmanyokat | Method and apparatus for testing the wear resistance of textile yarns |
AUPS186802A0 (en) * | 2002-04-22 | 2002-05-30 | Odyssey Technology Pty Ltd | Oscillating disc cutter with speed controlling bearings |
CN101660989A (en) * | 2008-08-25 | 2010-03-03 | 中国船舶重工集团公司第七○三研究所 | Inching corrosion wear test machine |
CN101393113B (en) * | 2008-11-05 | 2010-10-13 | 中国科学院力学研究所 | Device for measuring material friction action in multiatmosphere and vacuum environment |
CN101767312B (en) * | 2010-02-23 | 2011-11-16 | 厦门大学 | Wedge-type inclination adjustable non-spherical machining clamp |
CN101949773B (en) * | 2010-09-09 | 2012-05-30 | 河南科技大学 | Compound swinging type joint bearing testing machine |
CN103994890A (en) * | 2014-06-06 | 2014-08-20 | 中国航空综合技术研究所 | Swing wear life test clamp of joint bearing |
CN113466029B (en) * | 2021-06-29 | 2022-08-30 | 燕山大学 | Sheet metal tensile test anchor clamps |
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Address after: 250000 science and Technology Park, Xincheng University, Jinan, Shandong Province Patentee after: Qilu University of Technology (Shandong Academy of Sciences) Country or region after: China Address before: 250000 science and Technology Park, Xincheng University, Jinan, Shandong Province Patentee before: Qilu University of Technology Country or region before: China |