CN103986370A - High-speed cylindrical roller bearing and integrated monitoring device thereof - Google Patents
High-speed cylindrical roller bearing and integrated monitoring device thereof Download PDFInfo
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- CN103986370A CN103986370A CN201410238363.9A CN201410238363A CN103986370A CN 103986370 A CN103986370 A CN 103986370A CN 201410238363 A CN201410238363 A CN 201410238363A CN 103986370 A CN103986370 A CN 103986370A
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Abstract
The invention relates to a high-speed cylindrical roller bearing and an integrated monitoring device of the high-speed cylindrical roller bearing and belongs to the technical field of bearings and monitoring technologies of the bearings. A movable disc and a fixed disc are installed on an inner ring and an outer ring of the bearing respectively. A cantilever beam type piezoelectric vibrator is connected between the inner ring and the movable disc in a pressing mode, and a cantilever beam type piezoelectric vibrator is connected between the outer ring and the fixed disc in a pressing mode. Excited magnets are installed at the free ends of the piezoelectric vibrators. The movable disc and the fixed disc are respectively provided with a circuit board and different types of sensors. An excitation disc and holders are installed in a riveted mode. Limiting balls are arranged between the excitation disc and the inner surface of the outer ring. An excitation magnet is installed on the excitation disc. The integrated monitoring device has the advantages that the monitoring device and the bearing are integrated, and the integrated monitoring device has a self-energy-supplying sensing monitoring function and can be used as an independent component without changing the equipment structure; the piezoelectric vibrators are excited based on a differential motion principle, and kinetic energy and generating capacity obtained by the piezoelectric vibrators can be effectively increased at the time of high speed; the structure size of the piezoelectric vibrators and the arrangement of the excitation magnet are reasonable, piezoelectric plates only bear pressure stress without twisting, and reliability is high.
Description
Technical field
The invention belongs to rolling bearing and monitoring technical field thereof, be specifically related to a kind of High-Speed Cylindrical Roller Bearing and integrated monitoring device thereof.
Background technology
Bearing is a kind of typical mechanical basic part, has application extremely widely in fields such as machinery, vehicle, Aero-Space, steamer and the energy; But bearing is also one of the most flimsy part in rotary machine, 30% of rotating machinery fault is to be caused by bearing failure.Therefore, the status monitoring of bearing and Incipient Fault Diagnosis have caused people's great attention.The on-line monitoring of bearing state has progressively become the indispensable technology in field such as high-rating generator, steamer, high ferro and airborne vehicle, and the index of required monitoring comprises such as temperature, vibration, rotating speed and noise etc.Early stage bearing monitoring system is mainly external hanging type, and one of its drawback is distant between transducer and signal source, belongs to non-contacting indirect measurement, therefore error is larger.In recent years, people have proposed again multi-form Embedded Monitoring System in succession, this method can solve certainty of measurement and accuracy problem, but need to change structure or its integrality of relevant device, so that installation sensing and monitoring system, the problems such as this not only easily causes that the stress of equipment component is concentrated also cannot realize on the equipment of some complex structures or limited space; The most key, in the time that monitoring system need to be rotated with bearing inner race or outer ring, inconvenience is by line powered, and employing powered battery is very short service time.Therefore, current bearing monitoring system is all also non real-time, non-cpntact measurement indirectly substantially, is difficult to obtain timely and accurately the running status of bearing.
For solving the powerup issue of the rotation monitoring systems such as bearing, people have proposed the rotary piezoelectric cantilever generators of various ways, its principle is directly to utilize the mode of encouraging coupling by magnetic that relatively rotates between axle and bearing pedestal to encourage piezoelectric vibrator vibrating power-generation, and the maximum drawback of this mode of operation generator is to be only applicable to more slow-revving situation; In the time that rotating speed is higher, between rotary magnet and piezoelectric vibrator end magnet overlapping time extremely short, piezoelectric vibrator is difficult to obtain enough kinetic energy makes its generation vibrate and generate electricity.
Summary of the invention
The invention provides a kind of High-Speed Cylindrical Roller Bearing and integrated monitoring device thereof, existing in the time that rotating speed is higher in actual applications to solve existing bearing monitoring system and relevant piezoelectric generating device, between rotary magnet and piezoelectric vibrator end magnet overlapping time extremely short, piezoelectric vibrator is difficult to obtain enough kinetic energy vibrates and the problem of generating electricity its generation.
The technical solution used in the present invention is: the inner ring installation of aliging with outer ring one side, inner ring is narrower than outer ring, the inner ring end face of non-alignment one side is fixed with Moving plate by screw, between the end face flange of Moving plate and inner ring end face, be crimped with by sheet metal one and the bonding cantilever beam type piezoelectric vibrator one forming of piezoelectric patches one, the free end of this piezoelectric vibrator one is fixed with magnet one by screw, and magnet one is socketed in the pilot hole on Moving plate diapire; The bottom of the counterbore one on Moving plate diapire is provided with inner ring vibrating sensor and noise transducer, and described counterbore one place is provided with circuit board one by screw; Cycle surface is fixed with price fixing by screw, between the end face flange of price fixing and cycle surface, be crimped with by sheet metal two and the bonding cantilever beam type piezoelectric vibrator two forming of piezoelectric patches two, the free end of this piezoelectric vibrator two is fixed with magnet three by screw, and magnet three is socketed in the pilot hole on price fixing diapire; The bottom of the counterbore two on price fixing diapire is provided with outer ring vibrating sensor and speed probe, and described counterbore two places are provided with circuit board two by screw; The end face flange of excitation dish and retainer one and retainer two pass through rivet, between the end face flange outer surface of excitation dish and inner surface, be provided with spacing ball, this spacing ball is arranged in the sphere counterbore on the end face flange outer surface of excitation dish and can be along the rolling path rolling on the endoporus of outer ring; Encourage the wall of trying to get to the heart of a matter to be provided with the blind hole of magnet two and the through hole for tachometric survey are installed; The radius of magnet one, magnet two and magnet three equates and the distance at its centre-to-centre spacing inner ring center equates; It is upper that temperature sensor is arranged on rotation axis Z, and described temperature sensor, inner ring vibrating sensor, noise transducer and described piezoelectric vibrator one are connected with circuit board by different wire groups respectively; Described outer ring vibrating sensor is connected with circuit board two by different wire groups respectively with speed probe and described piezoelectric vibrator two.
One embodiment of the present invention is, the working portion of piezoelectric vibrator one and piezoelectric vibrator two is isosceles trapezoid, and the angle that isosceles trapezoid hypotenuse extended line intersects between center, the hypotenuse of magnet is thereon
wherein R0 is outer surface radius, the r of outer ring or inner ring
0for each magnetic blow out centre is apart from the distance at inner ring center, the quantity that m is piezoelectric vibrator.
One embodiment of the present invention is, the like pole of magnet one C1, magnet two C2 and magnet three C3 is near installing, magnet two C2 and magnet one C1 and magnet three C3 should make piezoelectric patches only bear compression while interaction, and pass between the distance R at the quantity n of magnet two C2, radius r and its centre-to-centre spacing inner ring center is
Advantage of the present invention is novel structure, and monitoring device and bearing are integrated, and self has self-powered ability, can be used as independently standarized component and uses, and without the structure that changes its erection unit, can realize real time on-line monitoring truly; Utilize the excitation dish excitation piezoelectric vibrator rotating with cylinder, piezoelectric vibrator gained kinetic energy and energy output can effectively increase high speed time; Adopt pilot hole to prevent that piezoelectric vibrator end magnet from rocking, and on piezoelectric vibrator physical dimension and excitation dish, magnet configuration is reasonable, therefore can guarantee that piezoelectric patches only bears compression, reliability is high.
Brief description of the drawings
Fig. 1 is the section of structure of a preferred embodiment of the present invention high speed cylinder roller bearing and integrated monitoring device thereof;
Fig. 2 is the A-A view of Fig. 1;
Fig. 3 is the B-B view of Fig. 1;
Fig. 4 is the I portion enlarged drawing of Fig. 1;
Fig. 5 is the structural representation of price fixing;
Fig. 6 is the structural representation of excitation dish;
Fig. 7 is Moving plate structural representation;
Fig. 8 is different determine angle than time active force and corner ratio relation curve.
Embodiment
As shown in Fig. 1～Fig. 7, the present invention includes: inner ring 1, retainer 2 one and retainer 22 ', for the cylinder 3 of loading ability of bearing, outer ring 4, excitation dish 5, for encouraging the ball 6 of dish 5 location, price fixing 9, Moving plate 10, cantilever beam piezoelectric vibrators one A1 and cantilever beam piezoelectric vibrators two A2, magnet one C1, magnet two C2 and magnet three C3, circuit board one B1 and circuit board two B2, temperature sensor S1, inner ring vibrating sensor S2, noise transducer S3, outer ring vibrating sensor S4 and speed probe S5, and wire.
Described inner ring 1 is narrower than outer ring 4, inner ring 1 installation of aliging with outer ring 4 one sides, inner ring 1 end face of non-alignment one side is fixed with Moving plate 10 by screw, between the end face flange 101 of Moving plate 10 and inner ring 1 end face, be crimped with by sheet metal 1 and bonding cantilever beam type piezoelectric vibrator one A1 forming of piezoelectric patches 1, the free end of this piezoelectric vibrator one A1 is fixed with magnet one C1 by screw, and magnet one C1 is socketed in the pilot hole 103 on Moving plate 10 diapires 102; The bottom of the counterbore 1 on Moving plate 10 diapires 102 is provided with inner ring vibrating sensor S2 and noise transducer S3, and described counterbore one 104 places are provided with circuit board one B1 by screw; Outer ring 4 end faces are fixed with price fixing 9 by screw, between the end face flange 91 of price fixing 9 and outer ring 4 end faces, be crimped with by sheet metal 27 ' and piezoelectric patches 28 ' bonding cantilever beam type piezoelectric vibrator two A2 that form, the free end of this piezoelectric vibrator two A2 is fixed with magnet three C3 by screw, and magnet three C3 are socketed in the pilot hole 93 on price fixing 9 diapires 92; The bottom of the counterbore 2 94 on price fixing 9 diapires 92 is provided with outer ring vibrating sensor S4 and speed probe S5, and described counterbore 2 94 places are provided with circuit board two B2 by screw; The end face flange 51 of excitation dish 5 and retainer 1 and retainer 22 ' pass through rivet, between end face flange 51 outer surfaces of excitation dish 5 and outer ring 4 inner surfaces, be provided with spacing ball 6, this spacing ball 6 is arranged in the sphere counterbore 55 on end face flange 51 outer surfaces of excitation dish 5 and can be along the rolling path rolling on 4 endoporus of outer ring; Excitation is coiled 5 diapires 52 and is provided with the blind hole 53 of installation magnet two C2 and the through hole 54 for tachometric survey; The radius of magnet one C1, magnet two C2 and magnet three C3 equates and the distance at its centre-to-centre spacing inner ring 1 center equates; It is upper that temperature sensor S1 is arranged on rotation axis Z, and described temperature sensor S1, inner ring vibrating sensor S2, noise transducer S3 and described piezoelectric vibrator one A1 are connected with circuit board B1 by different wire groups respectively; Described outer ring vibrating sensor S4 is connected with circuit board two B2 by different wire groups respectively with speed probe S5 and described piezoelectric vibrator two A2.
In the course of work, in the time that inner ring 1 and Moving plate 10 relatively rotates with outer ring 4 and price fixing 9, with retainer 1 and retainer 22 ' the excitation dish 5 that is connected also produces relatively rotating of relative inner ring 1 and outer ring 4 under the drive of cylinder 3, thereby described magnet two C2 and magnet one C1 and magnet three C3 are produced relative rotation, the magnetic alternately changing between magnet two C2 and magnet one C1 and magnet three C3 is encouraged F forces piezoelectric vibrator one A1 and piezoelectric vibrator two A2 to produce flexural deformation, and then convert mechanical energy to electric energy, the electric energy generating is described temperature sensor S1 after conversion process, inner ring vibrating sensor S2, noise transducer S3, outer ring vibrating sensor S4 and speed probe S5 power supply, thereby realize the self-powered monitoring of different bearing parameters.
According to mechanical knowledge, when the stationary object that quality is M is subject to after external force F t action time, its speed obtaining is that v=Ft/M, kinetic energy are E=(Ft)
2/ (2M).Obviously,, in the time that other condition is identical, when the action time of power is too short, object can be because gained energy shortage be to overcome still transfixion of inertia force.Encouraging based on magnetic in the rotary piezoelectric generator of coupling excitation, be two the action time of exciting force F and relatively rotate the overlapping time of magnet and increase and shorten with rotating speed, in the time that rotating speed is too high, piezoelectric vibrator will can effectively not encouraged.Therefore, the action time of increase exciting force or reduction relative rotation speed can effectively increase the external energy that piezoelectric vibrator obtains.In the present invention, the relative rotation speed n1 between magnet two C2 and magnet one C1 and magnet three C3 is about the λ of relative rotation speed n2 between magnet one C1 and magnet three C3
n=n1/n2=r
0/ R
0doubly, t1 action time between magnet two C2 and magnet one C1 and magnet three C3 is about the λ of t2 action time between magnet one C1 and magnet three C3
t=1/ λ
n=R
0/ r
0doubly, wherein, r
0and R
0be respectively the radius of magnet two C2 and the radius of gyration at center thereof.Therefore, utilize the excitation dish 5 that rotates with cylinder 3 to encourage piezoelectric vibrator in the present invention, the kinetic energy that piezoelectric vibrator obtains is λ when direct-drive between price fixing 9 and Moving plate 10
e=(R
0/ r
0)
2doubly.
In the present invention, for improving the reliability of piezoelectric vibrator one A1 and piezoelectric vibrator two A2, working portion, i.e. L and the L ' of described piezoelectric vibrator one A1 and piezoelectric vibrator two A2 locate as isosceles trapezoid, the extended line of the hypotenuse of described isosceles trapezoid piezoelectric vibrator one A1 and piezoelectric vibrator two A2 intersects respectively magnet one C1 or magnet SanC3 center thereon, and described isosceles trapezoid two hypotenuse angle Q4 are calculated as follows:
wherein R
0for the outer surface radius R 1 of outer ring 4 or outer surface radius R 1 ', the r of inner ring 1
0for the distance at centre-to-centre spacing inner ring 1 center of magnet one C1 or magnet three C3, m is the quantity of piezoelectric vibrator one A1 and piezoelectric vibrator two A2.
According to mechanics of materials knowledge, cantilever beam free end is subject to external force F to do the used time, the bending stress σ that is x place apart from free end distance
mwith the width b of beam and the pass of thickness H be:
and the formation voltage V of piezoelectric vibrator one A1 and piezoelectric vibrator two A2
gwith stress σ
mbe directly proportional.If piezoelectric vibrator one A1 or the piezoelectric vibrator each cross-sectional width b of two A2 and thickness H equate respectively, its stiff end stress and formation voltage maximum and free end stress and formation voltage are zero, therefore for improving bending stress, the raising reliability of output voltage, reduction stiff end, in the present invention, the active section L of piezoelectric vibrator one A1 and piezoelectric vibrator two A2 and L ' locate as isosceles trapezoid; Can further try to achieve described piezoelectric vibrator two hypotenuse angle Q4 by trigonometric function knowledge,
wherein R
0for the external diameter R1 of outer ring 4 or internal diameter R1 ', the r of inner ring 1
0for the extending line intersection point of the hypotenuse of isosceles trapezoid piezoelectric vibrator one A1 and piezoelectric vibrator two A2 is apart from the distance at inner ring 1 center, m is the quantity of piezoelectric vibrator one A1 and piezoelectric vibrator two A2.
In the present invention, for avoiding piezoelectric patches 1 and the piezoelectric patches 28 of piezoelectric vibrator one A1 and piezoelectric vibrator two A2 ' bear tension stress damage, improve reliability, the like pole of magnet one C1, magnet two C2 and magnet three C3 is near installing, magnet two C2 and piezoelectric vibrator end magnet one C1 and magnet three C3 should make piezoelectric patches 1 and piezoelectric patches 28 while interaction ' only bear compression, and relation between the distance R at the quantity n of magnet two C2, radius r and its centre-to-centre spacing inner ring 1 center should meet:
The actual conditions that the operation principle of self-powered monitoring device and magnetic field are spatial distribution according to the present invention, the effect that arbitrary magnet one C1 and magnet three C3 bear multiple magnet two C2 simultaneously, the form of active force depends on the pole configuration mode between two axial adjacent magnets, for avoiding magnet two C2 and magnet one C1 or magnet three C3 to adsorb mutually, should make its like pole near installing; In addition, between magnet, the size of active force also depends on and determines angle ratio
wherein
for two of the magnet two C2 angles between the crossing tangent line in bearing centre of gyration place, Q2=2 π/n is the angle between the line of two adjacent Ci Zhu centers and the bearing centre of gyration, and wherein r and R are respectively magnet two C2 radiuses and magnet ErC2 center is the quantity of magnet two C2 to distance, the n of the bearing centre of gyration.The pass that can obtain thus between the distance R at quantity n, radius r and its centre-to-centre spacing inner ring 1 center of magnet two C2 is
fig. 8 provided the different directed force F that magnet one C1 and magnet three C3 are subject to magnet two C2 while determining angle than k with corner than the trial curve of j=Q3/Q1, wherein Q3 is the corner between magnet two C2 and magnet one C1 or magnet three C3.Fig. 8 explanation, in the time that other condition is determined, minimum repulsive force between magnet two C2 and magnet one C1 or magnet three C3 reduces, even occurs attraction with determining angle than the increase of k, therefore for avoiding piezoelectric patches in piezoelectric vibrator to bear tension stress, improve reliability, should get and less determine angle than k=1, and need meet relational expression
Claims (3)
1. a High-Speed Cylindrical Roller Bearing and integrated monitoring device thereof, it is characterized in that: the inner ring installation of aliging with outer ring one side, inner ring is narrower than outer ring, the inner ring end face of non-alignment one side is fixed with Moving plate by screw, between the end face flange of Moving plate and inner ring end face, be crimped with by sheet metal one and the bonding cantilever beam type piezoelectric vibrator one forming of piezoelectric patches one, the free end of this piezoelectric vibrator one is fixed with magnet one by screw, and magnet one is socketed in the pilot hole on Moving plate diapire; The bottom of the counterbore one on Moving plate diapire is provided with inner ring vibrating sensor and noise transducer, and described counterbore one place is provided with circuit board one by screw; Cycle surface is fixed with price fixing by screw, between the end face flange of price fixing and cycle surface, be crimped with by sheet metal two and the bonding cantilever beam type piezoelectric vibrator two forming of piezoelectric patches two, the free end of this piezoelectric vibrator two is fixed with magnet three by screw, and magnet three is socketed in the pilot hole on price fixing diapire; The bottom of the counterbore two on price fixing diapire is provided with outer ring vibrating sensor and speed probe, and described counterbore two places are provided with circuit board two by screw; The end face flange of excitation dish and retainer one and retainer two pass through rivet, between the end face flange outer surface of excitation dish and inner surface, be provided with spacing ball, this spacing ball is arranged in the sphere counterbore on the end face flange outer surface of excitation dish and can be along the rolling path rolling on the endoporus of outer ring; Encourage the wall of trying to get to the heart of a matter to be provided with the blind hole of magnet two and the through hole for tachometric survey are installed; The radius of magnet one, magnet two and magnet three equates and the distance at its centre-to-centre spacing inner ring center equates; Temperature sensor is arranged on rotation axis, and described temperature sensor, inner ring vibrating sensor, noise transducer and described piezoelectric vibrator one are connected with circuit board by different wire groups respectively; Described outer ring vibrating sensor is connected with circuit board two by different wire groups respectively with speed probe and described piezoelectric vibrator two.
2. a kind of High-Speed Cylindrical Roller Bearing according to claim 1 and integrated monitoring device thereof, it is characterized in that: the working portion of described piezoelectric vibrator one and piezoelectric vibrator two is isosceles trapezoid, and isosceles trapezoid hypotenuse extended line intersects the angle between center, the hypotenuse of magnet thereon and is
wherein R
0for outer surface radius, the r of outer ring or inner ring
0for each magnetic blow out centre is apart from the distance at inner ring center, the quantity that m is piezoelectric vibrator.
3. a kind of High-Speed Cylindrical Roller Bearing according to claim 1 and 2 and integrated monitoring device thereof, it is characterized in that: the like pole of described magnet one C1, magnet two C2 and magnet three C3 is near installing, magnet two C2 and magnet one C1 and magnet three C3 should make piezoelectric patches only bear compression while interaction, and pass between the distance R at the quantity n of magnet two C2, radius r and its centre-to-centre spacing inner ring center is
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410238363.9A CN103986370B (en) | 2014-05-28 | 2014-05-28 | A kind of High-Speed Cylindrical Roller Bearing and integrated monitoring device thereof |
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|---|---|---|---|
| CN201410238363.9A CN103986370B (en) | 2014-05-28 | 2014-05-28 | A kind of High-Speed Cylindrical Roller Bearing and integrated monitoring device thereof |
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| Publication Number | Publication Date |
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| CN103986370A true CN103986370A (en) | 2014-08-13 |
| CN103986370B CN103986370B (en) | 2016-05-04 |
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|---|---|---|---|
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Cited By (8)
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| CN104482041A (en) * | 2015-01-07 | 2015-04-01 | 浙江师范大学 | Large-scale self-monitoring conical roller bearing for generator |
| CN106160574A (en) * | 2016-06-15 | 2016-11-23 | 浙江师范大学 | A kind of non-co-vibration shape wheel-type electric generator based on cantilever beam piezoelectric vibrators |
| CN106198022A (en) * | 2016-08-11 | 2016-12-07 | 大连三环复合材料技术开发股份有限公司 | Self-lubricating knuckle bearing monitoring running state device and on-line monitoring system |
| CN108286926A (en) * | 2017-12-28 | 2018-07-17 | 洛阳轴承研究所有限公司 | A kind of the on-line measurement device and measurement method of retainer facing flange |
| CN111879516A (en) * | 2020-08-26 | 2020-11-03 | 丽水学院 | Automatic detection device for bearing roller and use method |
| CN111999058A (en) * | 2020-08-26 | 2020-11-27 | 丽水学院 | Bearing roller detection dismounting device and use method |
| CN112014105A (en) * | 2020-08-26 | 2020-12-01 | 丽水学院 | Bearing roller detection and installation device and use method |
| CN112332704A (en) * | 2020-11-15 | 2021-02-05 | 浙江师范大学 | Self-powered monitoring rolling bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106160574B (en) * | 2016-06-15 | 2018-01-19 | 浙江师范大学 | A kind of off-resonance type wheel-type electric generator based on cantilever beam piezoelectric vibrators |
| CN106160574A (en) * | 2016-06-15 | 2016-11-23 | 浙江师范大学 | A kind of non-co-vibration shape wheel-type electric generator based on cantilever beam piezoelectric vibrators |
| CN106198022B (en) * | 2016-08-11 | 2018-10-30 | 大连三环复合材料技术开发股份有限公司 | Self-lubricating knuckle bearing monitoring running state device and on-line monitoring system |
| CN106198022A (en) * | 2016-08-11 | 2016-12-07 | 大连三环复合材料技术开发股份有限公司 | Self-lubricating knuckle bearing monitoring running state device and on-line monitoring system |
| CN108286926A (en) * | 2017-12-28 | 2018-07-17 | 洛阳轴承研究所有限公司 | A kind of the on-line measurement device and measurement method of retainer facing flange |
| CN108286926B (en) * | 2017-12-28 | 2020-02-21 | 洛阳轴承研究所有限公司 | Online measuring device and method for end face flange of retainer |
| CN111879516A (en) * | 2020-08-26 | 2020-11-03 | 丽水学院 | Automatic detection device for bearing roller and use method |
| CN111999058A (en) * | 2020-08-26 | 2020-11-27 | 丽水学院 | Bearing roller detection dismounting device and use method |
| CN112014105A (en) * | 2020-08-26 | 2020-12-01 | 丽水学院 | Bearing roller detection and installation device and use method |
| CN112014105B (en) * | 2020-08-26 | 2021-11-23 | 丽水学院 | Bearing roller detection and installation device and use method |
| CN111999058B (en) * | 2020-08-26 | 2022-01-28 | 丽水学院 | Bearing roller detection dismounting device and use method |
| CN111879516B (en) * | 2020-08-26 | 2022-01-28 | 丽水学院 | Automatic detection device for bearing roller and use method |
| CN112332704A (en) * | 2020-11-15 | 2021-02-05 | 浙江师范大学 | Self-powered monitoring rolling bearing |
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|---|---|
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Inventor after: Han Junwu Inventor after: Zhang Xiaoyi Inventor after: Ma Jijie Inventor after: Wang Shuyun Inventor after: Wang Bin Inventor after: Zhu Yana Inventor after: Cao Zhenxin Inventor before: Han Junwu Inventor before: Zhang Xiaoyi Inventor before: Wang Shuyun Inventor before: Zeng Ping Inventor before: Liu Dianlong |
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