CN111540562B - Magnetizing device and magnetizing method for rotor of interpolation type permanent magnet synchronous motor - Google Patents
Magnetizing device and magnetizing method for rotor of interpolation type permanent magnet synchronous motor Download PDFInfo
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- CN111540562B CN111540562B CN202010342090.8A CN202010342090A CN111540562B CN 111540562 B CN111540562 B CN 111540562B CN 202010342090 A CN202010342090 A CN 202010342090A CN 111540562 B CN111540562 B CN 111540562B
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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Abstract
The invention discloses a magnetizing device and a magnetizing method for an interpolation type permanent magnet synchronous motor rotor, which comprises a base, wherein the left side and the right side of the base are fixedly connected with supporting frames, and a rotor to be magnetized is rotatably connected between the two supporting frames; the front side and the rear side of the base are connected with magnetizing magnetic poles in a sliding manner; the left side or the right side of the rotor is provided with a positioning sleeve moving along the axial direction of the rotor, and the top and the bottom of the positioning sleeve respectively extend axially to form a positioning baffle plate positioned between the upper part and the lower part of the two magnetizing magnetic poles; the two magnetizing magnetic poles are symmetrically arranged and can hold the rotor in an arc structure, and when the two magnetizing magnetic poles move relatively, the positioning sleeve and the rotor can be pushed to rotate simultaneously, so that the center lines of the magnetic poles of the rotor and the magnetizing magnetic poles are superposed. The invention can effectively prevent the phenomena of magnetic steel attraction, wrong polarity installation, difficult discovery and the like, the magnetizing direction is radial, the magnetizing efficiency and quality of the rotor can be greatly improved, and the magnetizing device has simple structure, low manufacturing cost and convenient use.
Description
Technical Field
The invention belongs to the technical field of permanent magnet synchronous motor manufacturing, and particularly relates to a magnetizing device and a magnetizing method for an interpolation type permanent magnet synchronous motor rotor.
Background
The magnetic steel of the rotor of the interpolation type permanent magnet synchronous motor has strong magnetic force, so that the phenomena of magnetic steel attraction, wrong polarity installation, difficulty in finding and the like easily occur in the process of inserting the pre-magnetized magnetic steel into the rotor, and the problems of difficult assembly, low assembly efficiency and low quality are caused.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a device and a method for magnetizing a rotor of an internal-insertion permanent magnet synchronous motor, in which non-magnetized magnetic steel is inserted into the rotor, and then the magnetized magnetic poles are aligned with the magnetic poles of the rotor and magnetized, and the magnetizing direction is radial, thereby improving the magnetizing effect.
In order to achieve the purpose, the invention adopts the following technical measures:
the invention discloses a magnetizing device of an interpolation type permanent magnet synchronous motor rotor, which comprises a base, wherein the left side and the right side of the base are fixedly connected with supporting frames, and a rotor to be magnetized is rotatably connected between the two supporting frames; the front side and the rear side of the base are slidably connected with magnetizing magnetic poles, and magnetizing coils are nested in the two magnetizing magnetic poles; the left side or the right side of the rotor is provided with a positioning sleeve moving along the axial direction of the rotor, and the top and the bottom of the positioning sleeve respectively extend axially to form a positioning baffle plate positioned between the upper part and the lower part of the two magnetizing magnetic poles; the two magnetizing magnetic poles are symmetrically arranged and can hold the rotor in an arc structure, and when the two magnetizing magnetic poles move relatively, the positioning sleeve and the rotor can be pushed to rotate simultaneously, so that the center lines of the magnetic poles of the rotor and the magnetizing magnetic poles are superposed.
Furthermore, a first shaft extension end and a second shaft extension end which extend axially are arranged at two ends of the rotor, wherein a second groove which is arranged along the axial direction of the first shaft extension end is formed on the first shaft extension end, and the positioning sleeve is sleeved on the first shaft extension end and can move along the length direction of the first shaft extension end; the locating sleeve is provided with an inner hole boss which can slide in the second groove.
Wherein the second groove is a key slot inherent to the rotor itself.
Preferably, the first shaft extension end and the second shaft extension end are respectively supported by a fixed center and a movable center; the fixed tip is provided with a first groove which is on the same straight line with the second groove, the positioning sleeve can be sleeved on the fixed tip, and a boss in an inner hole can slide in the first groove.
Further, the supporting frame comprises a first supporting frame and a second supporting frame which are respectively positioned at the left side and the right side of the base; the fixed center is fixedly connected with the first support frame, and the movable center is connected with the second support frame in a bolt fit mode, so that the movable center can axially move.
Preferably, the magnetizing magnetic poles comprise a first magnetizing magnetic pole and a second magnetizing magnetic pole which are respectively positioned on the front side and the rear side of the base, and a first magnetizing coil and a second magnetizing coil are respectively nested in the first magnetizing magnetic pole and the second magnetizing magnetic pole; the first magnetizing magnetic pole and the second magnetizing magnetic pole are fixedly connected with the first magnetism isolating base plate and the second magnetism isolating base plate respectively, the first magnetism isolating base plate and the second magnetism isolating base plate are connected with the base in a sliding mode, and the first magnetizing magnetic pole and the second magnetizing magnetic pole can be driven to move along the front-back direction of the base.
Further, the positioning baffle comprises a first positioning baffle and a second positioning baffle which axially extend from the top and the bottom of the positioning sleeve respectively, the first positioning baffle is positioned between the upper parts of the first magnetizing magnetic pole and the second magnetizing magnetic pole, and the second positioning baffle is positioned between the lower parts of the first magnetizing magnetic pole and the second magnetizing magnetic pole; the first positioning baffle plate and the second positioning baffle plate are made of magnetism-isolating stainless steel materials. The first magnetism isolating base plate and the second magnetism isolating base plate are made of magnetism isolating stainless steel materials.
The widths of the first positioning baffle plate and the second positioning baffle plate can ensure that the arc surfaces of the first magnetizing magnetic pole and the second magnetizing magnetic pole are attached to the arc surface of the rotor.
The key part of the invention is the positioning sleeve, the top and the bottom of the positioning sleeve are provided with a first positioning baffle plate and a second positioning baffle plate which extend axially, and the part ensures that the center line of the magnetic pole of the rotor is superposed with the center lines of the first magnetizing magnetic pole and the second magnetizing magnetic pole when the rotor of the synchronous motor is magnetized, thereby solving the technical difficulty of magnetic pole positioning of the rotor. The component has the advantages that when the first magnetizing magnetic pole and the second magnetizing magnetic pole move relatively to clamp the rotor, the center line of the magnetic pole of the rotor is coincided with the center lines of the first magnetizing magnetic pole and the second magnetizing magnetic pole, and the component has the technical effects of accurate positioning and high positioning speed.
The invention discloses a magnetizing method of a magnetizing device of an interpolation type permanent magnet synchronous motor rotor, which comprises the following steps: when the rotor is magnetized, the positioning sleeve is sleeved on the fixed center, an inner hole boss of the positioning sleeve penetrates into the first groove, the fixed center and the movable center are respectively pushed into tapered holes of a first shaft extending end and a second shaft extending end of the rotor to support the rotor, the positioning sleeve is moved into the first shaft extending end, the inner hole boss of the positioning sleeve penetrates into the second groove, the first positioning baffle plate is located between the first magnetizing magnetic pole and the upper portion of the second magnetizing magnetic pole, and the second positioning baffle plate is located between the lower portions of the first magnetizing magnetic pole and the second magnetizing magnetic pole. When magnetizing, the first magnetizing magnetic pole and the second magnetizing magnetic pole move relatively to hold the rotor, meanwhile, the first magnetizing magnetic pole and the second magnetizing magnetic pole push the positioning sleeve to rotate with the rotor, so that the center line of the magnetic pole of the rotor is superposed with the center lines of the first magnetizing magnetic pole and the second magnetizing magnetic pole, and then exciting current is introduced into the first magnetizing coil and the second magnetizing coil according to the magnetic pole polarity requirement of the rotor, so that the magnetic pole of the rotor is magnetized. The magnetizing device can automatically align the magnetizing magnetic pole with the magnetic pole of the rotor, and the magnetizing direction is radial, so that the magnetizing efficiency and quality of the rotor can be greatly improved.
The first magnetizing magnetic pole and the second magnetizing magnetic pole move relatively before magnetizing, and the first positioning baffle plate and the second positioning plate on the positioning sleeve are respectively arranged between the first magnetizing magnetic pole and the second magnetizing magnetic pole vertically. When the first magnetizing magnetic pole and the second magnetizing magnetic pole move relatively to embrace the rotor, the first positioning baffle plate and the second positioning baffle plate are pushed to rotate, the first positioning baffle plate, the second positioning baffle plate and the positioning sleeve are integrated, so that the positioning sleeve is driven to rotate, an inner hole boss of the positioning sleeve is arranged in a second groove at a first shaft extension end of the rotor, and the positioning sleeve drives the rotor to rotate, so that the magnetic poles of the rotor and the magnetizing magnetic poles are aligned or overlapped.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the magnetizing device and the magnetizing method of the rotor of the interpolation type permanent magnet synchronous motor can effectively prevent the phenomena of magnetic steel attraction, wrong polarity installation, difficulty in finding and the like, and the magnetizing direction is radial, so that the magnetizing efficiency and quality of the rotor can be greatly improved.
Drawings
Fig. 1 is a schematic structural diagram of a magnetizing apparatus for an interpolant permanent magnet synchronous motor rotor according to the present invention.
Fig. 2 is a left side half sectional view of fig. 1.
Fig. 3 is a schematic structural diagram of the positioning sleeve of the present invention.
Fig. 4 is a side view of fig. 3.
Wherein: 1-base, 2-first supporting frame, 3-fixed tip, 4-first groove, 5-locating sleeve, 6-first locating baffle, 7-first shaft extension end, 8-second groove, 9-first magnet exciting coil, 10-first magnetizing pole, 11-rotor, 12-second shaft extension end, 13-movable tip, 14-second supporting frame, 15-first magnetism isolating base plate, 16-second locating baffle, 17-second magnetism isolating base plate, 18-second magnet exciting coil, 19-second magnetizing pole, 20-first magnet, 21-magnetic pole center line of rotor, 22-center line of magnetizing pole, 23-second magnet, and 24-inner hole boss.
Detailed Description
As shown in fig. 1, the apparatus for magnetizing a rotor of an interpolant permanent magnet synchronous motor according to the present invention comprises: the magnetizing device comprises a base 1, a first supporting frame 2, a fixed tip 3, a positioning sleeve 5, a first magnetizing coil 9, a first magnetizing magnetic pole 10, a rotor 11 to be magnetized, a second shaft extension end 12, a movable tip 13, a second supporting frame 14, a first magnetism isolating base plate 15, a second magnetism isolating base plate 17, a second magnetizing coil 18 and a second magnetizing magnetic pole 19. The first support frame 2 and the second support frame 14 are respectively located on the left side and the right side of the base 1, the first shaft extension end 7 and the second shaft extension end 12 axially extend along two ends of the rotor 11, the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19 have symmetrical circular arc structures, the magnetizing magnetic poles are aligned with the magnetic poles of the rotor 11, and the magnetizing direction is radial.
As shown in fig. 1 and 2, the first magnetizing coil 9 and the second magnetizing coil 18 are respectively sleeved in the first magnetizing pole 10 and the second magnetizing pole 19, and the first magnetizing pole 10 and the second magnetizing pole 19 are respectively fixedly connected with the first magnetism isolating pad 15 and the second magnetism isolating pad 17. The first magnetism isolating base plate 15 and the second magnetism isolating base plate 17 are connected with the base 1 in a sliding mode and drive the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19 to move along the front-back direction of the base 1. The first magnetic isolation backing plate 15 and the second magnetic isolation backing plate 17 are made of magnetic isolation stainless steel.
As shown in fig. 1, a first groove 4 is formed in the fixed center 3, the fixed center 3 is fixedly connected with the first support frame 2, and the first support frame 2 is fixedly connected with the base 1. The live center 13 is connected with the second support frame 14 in a bolt matching mode, the live center 13 can move axially, and the second support frame 14 is fixedly connected with the base 1.
As shown in fig. 1, the positioning sleeve 5 of the present invention has an inner hole boss 24 and a first positioning baffle 6 and a second positioning baffle 16, the first positioning baffle 6 and the second positioning baffle 16 axially extend from the top and the bottom of the positioning sleeve 5 respectively, the first positioning baffle 6 and the second positioning baffle 16 are made of magnetic-isolating stainless steel, the positioning sleeve 5 is sleeved on the fixed tip 3, and the inner hole boss 24 can penetrate into the first groove 4 of the fixed tip 3. The inner bore boss 24 resembles a rectangular key and is sized to fit within the first recess 4 and the second recess 8 of the first shaft extension 7 to ensure that the locating sleeve 5 can slide over the fixed point 3 and the first shaft extension 7. The inner hole boss 24 slides between the first groove 4 and the second groove 8, when the inner hole boss 24 is in the second groove 8, the first positioning baffle 6 is between the upper parts of the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19, the second positioning baffle 16 is between the lower parts of the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19, and when the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19 move relatively, the positioning sleeve 5 and the rotor 11 can be pushed to rotate simultaneously, so that the magnetic pole center line of the rotor 11 is coincided with the center lines of the first magnetizing magnetic pole 10 and the second magnetizing pole 19.
As shown in fig. 2, the rotor 11 is provided with a first magnetic block 20 and a second magnetic block 23, and the center lines of the first magnetic block 20 and the second magnetic block 23 are the magnetic pole center line 21 of the rotor.
The method for magnetizing the rotor of the interpolation type permanent magnet synchronous motor comprises the following steps:
firstly, before the rotor 11 is magnetized, the positioning sleeve 5 is sleeved on the fixed centre 3, and an inner hole boss 24 of the positioning sleeve 5 penetrates into a first groove 4 of the fixed centre 3;
secondly, the fixed center 3 and the movable center 13 are respectively pushed into two conical holes of a first shaft extending end 7 and a second shaft extending end 12 of the rotor 11 to support the rotor 11;
thirdly, the positioning sleeve 5 is sleeved into the first shaft extension end 7, the inner hole boss 24 slides into the second groove 8 of the first shaft extension end 7, the first positioning baffle 6 at the top of the positioning sleeve 5 is positioned between the upper parts of the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19, and the second positioning baffle 16 at the bottom of the positioning sleeve 5 is positioned between the lower parts of the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19.
And fourthly, the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19 move relatively to embrace the rotor 11, and meanwhile, the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19 push the first positioning baffle plate 6 and the second positioning baffle plate 16, the positioning sleeve 5 and the rotor 11 to rotate, so that the magnetic pole center line 21 of the rotor 11 is coincident with the center lines of the first magnetizing magnetic pole 10 and the second magnetizing magnetic pole 19.
Fifthly, exciting current is introduced to the first magnetizing coil 9 and the second magnetizing coil 18 according to the magnetic pole polarity requirement of the rotor 11, so that the magnetic poles of the rotor 11 are magnetized.
When the first magnetizing coil 9 and the second magnetizing coil 18 are applied with magnetizing direct current, magnetic lines of force passing through the magnetizing magnetic poles and the rotor magnetic poles are perpendicular to the surface of the rotor, and the magnetizing direction of the rotor is ensured to be radial.
According to the invention, the non-magnetized magnetic steel can be inserted into the rotor, and then the magnetized magnetic poles are aligned with the magnetic poles of the rotor for magnetization, and the magnetization direction is radial, so that the magnetization effect is improved.
Claims (6)
1. An interpolation type permanent magnet synchronous motor rotor magnetizing device comprises a base (1), and is characterized in that: the left side and the right side of the base (1) are fixedly connected with support frames, and a rotor (11) to be magnetized is rotatably connected between the two support frames;
the front side and the rear side of the base (1) are connected with magnetizing magnetic poles in a sliding mode, and magnetizing coils are nested in the two magnetizing magnetic poles;
a positioning sleeve (5) moving along the axial direction of the rotor is arranged on the left side or the right side of the rotor (11), and positioning baffle plates positioned between the upper parts and the lower parts of the two magnetizing magnetic poles axially extend from the top and the bottom of the positioning sleeve (5) respectively;
the two magnetizing magnetic poles are symmetrically arranged and can hold the rotor (11) in an arc structure, and when the two magnetizing magnetic poles move relatively, the positioning sleeve and the rotor can be pushed to rotate simultaneously, so that the center lines of the magnetic poles of the rotor and the magnetizing magnetic poles are superposed;
the two ends of the rotor (11) are provided with a first shaft extension end (7) and a second shaft extension end (12) which extend axially, wherein a second groove (8) which is arranged along the axial direction of the first shaft extension end is formed on the first shaft extension end (7), and the positioning sleeve (5) is sleeved on the first shaft extension end (7) and can move along the length direction of the first shaft extension end (7);
the positioning sleeve (5) is provided with an inner hole boss (24) which can slide in the second groove (8);
the first shaft extension end (7) and the second shaft extension end (12) are respectively supported by a fixed centre (3) and a movable centre (13);
the fixed center (3) is provided with a first groove (4) which is on the same straight line with the second groove (8), the positioning sleeve (5) is sleeved on the fixed center (3), and an inner hole boss (24) of the positioning sleeve slides in the first groove (4).
2. The apparatus of claim 1, wherein: the supporting frames comprise a first supporting frame (2) and a second supporting frame (14) which are respectively positioned at the left side and the right side of the base (1);
the fixed center (3) is fixedly connected with the first support frame (2), and the movable center (13) is connected with the second support frame (14) in a bolt fit mode, so that the movable center (13) can move axially.
3. The apparatus of claim 2, wherein: the magnetizing magnetic poles comprise a first magnetizing magnetic pole (10) and a second magnetizing magnetic pole (19) which are respectively positioned on the front side and the rear side of the base (1), and a first magnetizing coil (9) and a second magnetizing coil (18) are respectively nested in the first magnetizing magnetic pole (10) and the second magnetizing magnetic pole (19);
first magnetic pole (10) magnetize magnetic pole (19) and second magnetic pole respectively with first magnetic backing plate (15) and second magnetic backing plate (17) that separate, first magnetic backing plate (15), second magnetic backing plate (17) and base (1) sliding connection separate to can drive first magnetic pole (10) magnetize magnetic pole (19) and remove along the fore-and-aft direction of base (1).
4. The apparatus of claim 3, wherein: the positioning baffle comprises a first positioning baffle (6) and a second positioning baffle (16) which axially extend from the top and the bottom of the positioning sleeve (5) respectively, the first positioning baffle (6) is positioned between the upper parts of the first magnetizing pole (10) and the second magnetizing pole (19), and the second positioning baffle (16) is positioned between the lower parts of the first magnetizing pole (10) and the second magnetizing pole (19);
the first positioning baffle plate (6) and the second positioning baffle plate (16) are made of magnetic-isolating stainless steel materials.
5. The apparatus of claim 4, wherein: the first magnetism isolating cushion plate (15) and the second magnetism isolating cushion plate (17) are made of magnetism isolating stainless steel materials.
6. A method for magnetizing a rotor of an internal permanent magnet synchronous motor by using the magnetizing device of claim 5, is characterized in that: the method comprises the following steps:
A. firstly, a positioning sleeve (5) is sleeved on a fixed tip (3), and an inner hole boss (24) of the positioning sleeve (5) penetrates into a first groove (4) of the fixed tip (3);
B. respectively ejecting the fixed center (3) and the movable center (13) into two conical holes of a first shaft extension end (7) and a second shaft extension end (12) of the rotor (11) to support the rotor (11);
C. sleeving a positioning sleeve (5) into a first shaft extension end (7), sliding an inner hole boss (24) into a second groove (8) of the first shaft extension end (7), positioning a first positioning baffle plate (6) at the top of the positioning sleeve (5) between the upper parts of a first magnetizing magnetic pole (10) and a second magnetizing magnetic pole (19), and positioning a second positioning baffle plate (16) at the bottom of the positioning sleeve (5) between the lower parts of the first magnetizing magnetic pole (10) and the second magnetizing magnetic pole (19);
D. the first magnetizing magnetic pole (10) and the second magnetizing magnetic pole (19) move relatively to hold the rotor (11), and meanwhile, the first magnetizing magnetic pole (10) and the second magnetizing magnetic pole (19) push the first positioning baffle plate (6) and the second positioning baffle plate (16), the positioning sleeve (5) and the rotor (11) to rotate, so that a magnetic pole center line (21) of the rotor (11) is superposed with center lines of the first magnetizing magnetic pole (10) and the second magnetizing magnetic pole (19);
E. exciting current is supplied to the first magnetizing coil (9) and the second magnetizing coil (18) according to the magnetic pole polarity requirement of the rotor (11), so that the magnetic poles of the rotor (11) are magnetized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010342090.8A CN111540562B (en) | 2020-04-27 | 2020-04-27 | Magnetizing device and magnetizing method for rotor of interpolation type permanent magnet synchronous motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010342090.8A CN111540562B (en) | 2020-04-27 | 2020-04-27 | Magnetizing device and magnetizing method for rotor of interpolation type permanent magnet synchronous motor |
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| CN111540562B true CN111540562B (en) | 2021-08-03 |
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| CN112885557B (en) * | 2021-01-13 | 2024-05-14 | 嵊州市伏安特磁电科技有限公司 | High-power strong-magnetic rotor segmented integral magnetizing equipment and magnetizing method thereof |
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| CN1248390C (en) * | 1999-04-20 | 2006-03-29 | 三菱电机株式会社 | Motor shaft for rotation/direct action converting motor and method of manufacturing the motor shaft |
| JP3582789B2 (en) * | 2002-10-01 | 2004-10-27 | セイコーインスツルメンツ株式会社 | Permanent magnet for motor device, motor device, and magnetization method |
| US6903640B2 (en) * | 2002-10-11 | 2005-06-07 | Emerson Electric Co. | Apparatus and method of using the stator coils of an electric motor to magnetize permanent magnets of the motor rotor when the span of each stator coil is smaller than the width of each permanent magnet pole |
| UA24132U (en) * | 2006-12-18 | 2007-06-25 | Volodymyr Dal East Ukrainian N | Device for reliability prediction of metal constructions |
| CN204102662U (en) * | 2014-09-25 | 2015-01-14 | 中钢集团安徽天源科技股份有限公司 | Anisotropic permanent-magnetic material multi-pole magnet-ring automatic magnetism-charging device |
| CN104440224B (en) * | 2014-11-14 | 2017-03-15 | 重庆康辉机械制造有限公司 | Valve rotator Milling Machining locating assembly |
| CN104821220A (en) * | 2014-12-19 | 2015-08-05 | 广东威灵电机制造有限公司 | Magnetizing device, rotor permanent magnet ring, rotor, and motor |
| CN105448464B (en) * | 2016-01-27 | 2017-05-24 | 黄鹏程 | Magnetizing clamping conveying lifting mechanism for high-power permanent magnet rear earth motor |
| CN106252023B (en) * | 2016-08-23 | 2017-12-05 | 浙江东阳东磁稀土有限公司 | A kind of multi-pole magnet-ring orientation and the fixture and method that magnetize |
| CN108418324B (en) * | 2018-02-26 | 2020-06-30 | 美的威灵电机技术（上海）有限公司 | Permanent magnet motor rotor, magnetizing equipment, preparation method and permanent magnet motor |
| CN110480379A (en) * | 2019-08-29 | 2019-11-22 | 金陵科技学院 | A kind of intelligent fixture fixture and its application method |
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Effective date of registration: 20230214 Address after: 448000 Group 7, Xinqiao Village, Ziling Town, Dongbao District, Jingmen City, Hubei Province Patentee after: Jingmen Bochuang Optoelectronics Technology Co.,Ltd. Address before: 448000 No. 33, Xiangshan Avenue, Jingmen, Hubei Patentee before: JINGCHU University OF TECHNOLOGY |