CN107910156B - The magnetizer and its magnetization method of six face magnetcisuspension floating bodies - Google Patents
The magnetizer and its magnetization method of six face magnetcisuspension floating bodies Download PDFInfo
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- CN107910156B CN107910156B CN201710938062.0A CN201710938062A CN107910156B CN 107910156 B CN107910156 B CN 107910156B CN 201710938062 A CN201710938062 A CN 201710938062A CN 107910156 B CN107910156 B CN 107910156B
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- magnetized head
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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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- Control Of Vehicles With Linear Motors And Vehicles That Are Magnetically Levitated (AREA)
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Abstract
The invention belongs to accelerometer technical fields, more particularly to a kind of magnetizer and its magnetization method of six face magnetcisuspension floating bodies.It solves the problems such as prior art design is unreasonable.The magnetizer of this six face magnetcisuspension floating body includes the lower magnetized head being vertically arranged and the upper magnetized head right above lower magnetized head, the present apparatus further includes four circle distributions and horizontally disposed lateral face magnetized head, the lateral face magnetized head is between lower magnetized head and upper magnetized head, first is equipped in the upper end of lower magnetized head to magnetize contact plane, it is equipped in the lower end of upper magnetized head and magnetizes that contact plane is parallel second to magnetize contact plane with described first, be respectively equipped with the third being vertically arranged in the inner end of each lateral face magnetized head and magnetize contact plane.The present invention has the advantages that method is simple and can once complete six faces while magnetize to have can be improved the efficiency that magnetizes.
Description
Technical field
The invention belongs to accelerometer technical field, more particularly to a kind of six face magnetcisuspension floating bodies magnetizer and its magnetize
Method.
Background technique
Conventional accelerometers generally use spring oscillator and carry out induction acceleration variation, but due to existing between oscillator and spring
Physical contact will receive the influence of factors such as mechanical structure performance and friction and cannot react real acceleration input completely.
In order to overcome the technical problem, the research for the various floated accelerometers of development that countries in the world are all done one's utmost, not due to it
There are physical contacts, so as to react real acceleration change completely, are conducive to improve reduced-precision volume.
All there is the magnet of remanent magnetic field without six faces in the prior art, certainly, the same solid permanent-magnet material of hexahedron does not have
Method realizes that six faces all have remanent magnetic field, so also magnetizing without corresponding six face.
About six face magnetcisuspension floating bodies, the structure in each of which face includes the outer layer of permanent-magnet material and the inner core of soft magnetic materials, and two
Kind material is realized using being connected, and based on existing magnetization method (two magnetized heads of a generally coil configuration), cannot achieve
To six face, magnetcisuspension floating body magnetizes.
Summary of the invention
The first purpose of this invention is in view of the above-mentioned problems, providing one kind can magnetize to six face magnetcisuspension floating bodies
Magnetizer.
Second object of the present invention is in view of the above-mentioned problems, to provide a kind of method simple and can be to six faces of suspended substance
The magnetization method to magnetize simultaneously is to improve the efficiency that magnetizes.
In order to achieve the above objectives, present invention employs following technical proposals: the magnetizer of this six face magnetcisuspension floating body includes
The lower magnetized head being vertically arranged and the upper magnetized head right above lower magnetized head, the present apparatus further include four circle distributions and water
The lateral face magnetized head of flat setting, the lateral face magnetized head is between lower magnetized head and upper magnetized head, in lower magnetized head
Upper end be equipped with first and magnetize contact plane, be equipped in the lower end of upper magnetized head parallel with described first contact plane that magnetizes
Second magnetizes contact plane, is respectively equipped with the third being vertically arranged in the inner end of each lateral face magnetized head and magnetizes contact plane.
Upper magnetized head, lower magnetized head and the four lateral face magnetized heads of design, may be implemented magnetizing for six faces；
Upper magnetized head, lower magnetized head and four lateral face magnetized heads, two opposite magnetic heads and the suspended substance being magnetized form closed magnetic
Road improves the magnetic field strength that magnetizes, and also improves the efficiency that magnetizes, and production efficiency is very high.
Secondly, the displacement of six face magnetcisuspension floating bodies during magnetizing is avoided by the design of above structure, meanwhile,
Since magnetic head uses soft magnetic materials, the phenomenon that also drastically reducing leakage field.
Magnetize contact plane area it is identical as the area in each face of six face magnetcisuspension floating bodies and shape.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, the header structure that magnetizes under described, on magnetize header structure and side
Structure to face magnetized head is identical, including conical section and the flat segments connecting with conical section stub end, in flat segments and/or taper
Section outside is arranged with hot-wire coil respectively.
The design of conical section may be implemented to avoid, at the same time it can also further increase the efficiency that magnetizes.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, the lower magnetized head is fixed on the rack；Or in machine
Frame is equipped with the first lift drive mechanism that the driving lower magnetized head is gone up and down in vertical direction.
First lift drive mechanism includes any one in cylinder, oil cylinder and linear motor.
It is equipped with first between lower magnetized head and rack and is vertically directed structure.
Here first is vertically directed the structure that structure includes guide post combination guide sleeve.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, the rack is equipped with the driving upper magnetized head and exists
Second lift drive mechanism of vertical direction lifting.
Second lift drive mechanism includes any one in cylinder, oil cylinder and linear motor.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, each lateral face magnetized head connects with horizontal drive mechanism respectively
It connects, and the horizontal drive mechanism is separately connected on the rack.
Horizontal drive mechanism includes any one in cylinder, oil cylinder and linear motor.
By the design of above-mentioned driving mechanism, the production movement of automation may be implemented, virtually improve production
Efficiency.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, the rack is equipped with and is set on the outside of lower magnetized head
Cylindrical support is connected with the cantilever beam of four circle distributions in the upper end of cylindrical support, in the free end difference of every cantilever beam
It is connected with the inwardly angled inclined shore being arranged upward and the inclined shore upper end converges to annular sleeve circumferential direction, four lateral
Face magnetized head is arranged in one by one on the cantilever beam, and upper magnetized head is arranged in annular sleeve.
By design cylindrical support, cantilever beam, inclined shore and annular sleeve, a fixing support rack, magnetized head are constituted
It combines on a fixing support rack, is not only convenient for the dismounting of device, and further reduce the maintenance difficulty of device.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, fixed frame, Yi Jiwei are arranged in the upper end of lower magnetized head
Posting above fixed frame is equipped with axial elasticity structure between fixed frame and posting and posting is covered and magnetized first
Contact plane periphery is equipped with the elevator drive machine that the driving posting is gone up and down in vertical direction in rack or fixed frame
Structure.
The inner wall upper edge hole of posting is equipped with chamfering.
Lift drive mechanism includes the cylinder or oil cylinder of several circle distributions.
By the design of above structure, the accuracy of six face magnetcisuspension floating bodies positioning may be implemented, avoid the inclined of position
From cause it is subsequent need to correct again, virtually improve production efficiency.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, several lower locating notches are equipped on the outside of the fixed frame,
It is equipped with several and described lower locating notches upper locating notch correspondingly in the outside of posting, in posting and fixed frame
Between be equipped with guide housing, several be oriented to raised line and institute correspondingly with the described lower locating notch in being circumferentially with for guide housing
The guiding raised line stated is vertically arranged, and the upper end for being oriented to raised line, which is stuck in the upper locating notch and fixes with upper locating notch, to be connected
It connects, the lower end for being oriented to raised line is stuck in the lower locating notch and is slidably connected with lower locating notch.
By the design of above structure, the ride comfort gone up and down in the vertical direction may be implemented, at the same time it can also into one
Step improves whole structural strength.
In the magnetizer of six above-mentioned face magnetcisuspension floating bodies, the axial elasticity structure includes being arranged under guide housing
Several springs between end and fixed frame upper end.
The magnetization method of this six face magnetcisuspension floating body includes the following steps:
A, it positions, six face magnetcisuspension floating bodies is placed on the first of lower magnetized head and are magnetized on contact plane, upper magnetized head is downward
It moves and second contact plane that magnetizes is forced to contact with the upper surface of six face magnetcisuspension floating bodies, then in four lateral face magnetized heads
Opposite opposed lateral face magnetized head moves inward in opposite directions respectively and the third contact plane that magnetizes is forced to be oppressed one by one six two-by-two
In four circumferential planes of face magnetcisuspension floating body；
B, it magnetizes, lower magnetized head, upper magnetized head and lateral face magnetized head are powered, that is, realization is magnetized.
Opposite opposed lateral face magnetized head moves towards two-by-two, can be to avoid six face magnetic suspension during contact
Body is subjected to displacement.
Compared with prior art, the advantages of magnetizer and its magnetization method of this six face magnetcisuspension floating body, is:
1, upper magnetized head, lower magnetized head and the four lateral face magnetized heads designed, may be implemented filling for six faces
Magnetic not only increases the intensity that magnetizes, and also improves the efficiency that magnetizes, and production efficiency is very high.
Secondly, the displacement of six face magnetcisuspension floating bodies during magnetizing is avoided by the design of above structure, meanwhile,
The phenomenon that also avoiding leakage field.
2, structure is simple and easy to manufacture.
3, mechanical automation degree is improved.
4, magnetization method is simple and practical.
Detailed description of the invention
Fig. 1 is structural schematic diagram provided by the invention.
Fig. 2 is magnetized head structural schematic diagram provided by the invention.
Fig. 3 is the structural schematic diagram after increase rack provided by the invention.
Fig. 4 is enlarged structure schematic diagram at A in Fig. 3.
Fig. 5 is fixed frame structural schematic diagram provided by the invention.
Fig. 6 is the structural schematic diagram that cylindrical support provided by the invention is built-in with vertical bar.
Fig. 7 is the status diagram that six faces magnetcisuspension floating body provided by the invention is placed in posting.
In figure, lower magnetized head 1, first magnetize contact plane 11, upper magnetized head 2, second magnetize contact plane 21, lateral face
Magnetized head 3, third magnetize contact plane 31, rack 4, cylindrical support 5, cantilever beam 51, inclined shore 52, annular sleeve 53, fixed
Frame 6, lower locating notch 62, upper locating notch 63, guide housing 64, guiding raised line 65, spring 66, conical section a, is put down at posting 61
Straight section b, hot-wire coil c.
Specific embodiment
Below be invention specific embodiment and in conjunction with attached drawing, technical scheme of the present invention will be further described, but
Invention is not limited to these embodiments.
Embodiment one
As shown in Figure 1, the magnetizer of this six face magnetcisuspension floating body includes the lower magnetized head 1 being vertically arranged and magnetizes under being located at
First upper magnetized head 2 right above 1, the present apparatus further include four circle distributions and horizontally disposed lateral face magnetized head 3,
Above-mentioned lower magnetized head 1, upper magnetized head 2 and lateral face magnetized head 3 is respectively set on the rack.
As shown in figure 3, further, lower magnetized head 1 is fixed in rack 4.
The second lift drive mechanism that the driving upper magnetized head 2 is gone up and down in vertical direction is equipped in rack 4.
Each lateral face magnetized head 3 is connect with horizontal drive mechanism respectively, and the horizontal drive mechanism is separately connected
In rack 4.
Lateral face magnetized head 3 in pairs and moves toward one another or reverse motions.
The lateral face magnetized head 3 is between lower magnetized head 1 and upper magnetized head 2.
As shown in figures 1 and 3, it is equipped with first in the upper end of lower magnetized head 1 to magnetize contact plane 11, in upper magnetized head 2
Lower end, which is equipped with, magnetizes that contact plane 11 is parallel second to magnetize contact plane 21 with described first, magnetizes in each lateral face
First 3 inner end is respectively equipped with the third being vertically arranged and magnetizes contact plane 31.Under
Specifically, as shown in Fig. 2, 1 structure of lower magnetized head of the present embodiment, 2 structure of upper magnetized head and lateral face magnetized head 3
Structure it is identical, including conical section a and the flat segments b being connect with conical section a stub end, on the outside of flat segments b and conical section a point
It is not arranged with hot-wire coil c.
The design of conical section a, expands magnetic field.
As shown in fig. 3 to 7, the cylindrical support 5 for being set in lower 1 outside of magnetized head is equipped in rack 4, in cylindrical support 5
Inner wall is equipped with the vertical bar of several circle distributions, aluminium foil reflecting layer has been respectively coated by every vertical bar, vertical bar is encircled into
One circle and lower magnetized head 1 is located in the vertical bar that forms a circle, secondly, being equipped with several circle distributions in 5 lower end of cylindrical support
Through-hole is respectively equipped with aerofoil fan in each through-hole, is connected with the cantilever beam of four circle distributions in the upper end of cylindrical support 5
51, the inwardly angled inclined shore 52 being arranged upward and the inclination are connected separately in the free end of every cantilever beam 51
52 upper ends are supported to converge to annular sleeve 53 circumferential, that is, 52 upper end of inclined shore is circumferentially connect with annular sleeve 53, and four lateral faces fill
Magnetic head 3 is arranged in one by one on the cantilever beam 51, and upper magnetized head 2 is arranged in annular sleeve 53.
It is arranged with fixed frame 6 in the upper end of lower magnetized head 1, and the posting 61 above fixed frame 6, in fixed frame
Be equipped with axial elasticity structure between 6 and posting 61 and 61 sets of posting magnetize 11 periphery of contact plane first, in rack 4 or
Fixed frame 6 is equipped with the lift drive mechanism that the driving posting 61 is gone up and down in vertical direction.
Secondly, being equipped with several lower locating notches 62 on the outside of fixed frame 6, several and institute is equipped in the outside of posting 61
The one-to-one upper locating notch 63 of the lower locating notch 62 stated, is equipped with guide housing 64 between posting 61 and fixed frame 6,
Several and described lower locating notches 62 guiding raised line 65 and the guiding correspondingly are circumferentially in guide housing 64
Raised line 65 is vertically arranged, and the upper end of guiding raised line 65, which is stuck in the upper locating notch 63 and fixes with upper locating notch 63, to be connected
It connects, the lower end of guiding raised line 65 is stuck in the lower locating notch 62 and is slidably connected with lower locating notch 62.
The open-mouth bore of lower locating notch is less than the internal diameter of lower locating notch.
The open-mouth bore of upper locating notch is less than the internal diameter of upper locating notch.
The outer diameter for being oriented to raised line 65 is greater than the open-mouth bore of lower locating notch, and it is upper fixed that the outer diameter of guiding raised line 65 is greater than
The open-mouth bore of position notch.
Further, axial elasticity structure includes several bullets being arranged between 6 upper end of 64 lower end of guide housing and fixed frame
Spring 66.
After six face magnetcisuspension floating bodies are in place, lift drive mechanism driving posting 61 at this time is moved down, and is avoided
Interfere lateral face magnetized head close to six face magnetcisuspension floating bodies.
The magnetization method of this six face magnetcisuspension floating body includes the following steps:
A, it positions, six face magnetcisuspension floating bodies is placed on the first of lower magnetized head 1 and are magnetized on contact plane 11, upper magnetized head 2
It moves down and second contact plane 21 that magnetizes is forced to contact with the upper surface of six face magnetcisuspension floating bodies, then four lateral faces magnetize
Opposed lateral face magnetized head 3 opposite two-by-two in first 3 moves inward in opposite directions respectively and third is forced to magnetize contact plane 31 1
One compressing is in four circumferential planes of six face magnetcisuspension floating bodies；
B, it magnetizes, lower magnetized head 1, upper magnetized head 2 and lateral face magnetized head 3 are powered, that is, realization is magnetized.
Embodiment two
The present embodiment is essentially identical with the structure and principle of embodiment one, though therefore not to repeat here, different place
It is: is equipped with the first lift drive mechanism that the driving lower magnetized head 1 is gone up and down in vertical direction in rack 4.
Embodiment three
The present embodiment is essentially identical with the structure and principle of embodiment one, though therefore not to repeat here, different place
It is: is equipped with hot-wire coil c in conical section a outer sheath.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (7)
1. a kind of magnetizer of six face magnetcisuspension floating bodies, which is characterized in that the present apparatus include the lower magnetized head (1) being vertically arranged and
Upper magnetized head (2) right above lower magnetized head (1), the present apparatus further include four circle distributions and horizontally disposed lateral face
Magnetized head (3), the lateral face magnetized head (3) is between lower magnetized head (1) and upper magnetized head (2), in lower magnetized head (1)
Upper end be equipped with and first magnetize contact plane (11), the lower end of upper magnetized head (2) be equipped with magnetize with described first contact it is flat
Face (11) is parallel second to magnetize contact plane (21), is respectively equipped with and is vertically arranged in the inner end of each lateral face magnetized head (3)
Third magnetize contact plane (31)；
It is arranged with fixed frame (6) in the upper end of lower magnetized head (1), and is located at the posting (61) above fixed frame (6), solid
Determine to be equipped with axial elasticity structure between frame (6) and posting (61) and posting (61) covers and magnetizes contact plane (11) outside first
It encloses, the elevator drive machine that the driving posting (61) is gone up and down in vertical direction is equipped in rack (4) or fixed frame (6)
Structure；
It is equipped with several lower locating notches (62) on the outside of the fixed frame (6), is equipped with several and institute in the outside of posting (61)
The lower locating notch (62) stated correspondingly upper locating notch (63), is equipped between posting (61) and fixed frame (6) and leads
To frame (64), it is oriented to raised line correspondingly in several and described lower locating notch (62) that is circumferentially with of guide housing (64)
(65) and the guiding raised line (65) is vertically arranged, and the upper end of guiding raised line (65) is stuck in the upper locating notch (63)
And be fixedly connected with upper locating notch (63), the lower end of guiding raised line (65) is stuck in the lower locating notch (62) and under
Locating notch (62) is slidably connected.
2. the magnetizer of six faces magnetcisuspension floating body according to claim 1, which is characterized in that the lower magnetized head (1)
Structure, upper magnetized head (2) structure are identical with the structure of lateral face magnetized head (3), including conical section (a) and big with conical section (a)
The flat segments (b) of head end connection, are arranged with hot-wire coil (c) on the outside of flat segments (b) and/or conical section (a) respectively.
3. the magnetizer of six faces magnetcisuspension floating body according to claim 1, which is characterized in that the lower magnetized head (1)
It is fixed on rack (4)；Or the driving lower magnetized head (1) is gone up and down in vertical direction first is equipped on rack (4)
Lift drive mechanism.
4. the magnetizer of six faces magnetcisuspension floating body according to claim 3, which is characterized in that set in the rack (4)
The second lift drive mechanism that the upper magnetized head (2) for having driving described is gone up and down in vertical direction.
5. the magnetizer of six faces magnetcisuspension floating body according to claim 4, which is characterized in that each lateral face magnetized head
(3) it is connect respectively with horizontal drive mechanism, and the horizontal drive mechanism is connected on rack (4).
6. the magnetizer of six faces magnetcisuspension floating body according to claim 5, which is characterized in that set in the rack (4)
There is the cylindrical support (5) being set on the outside of lower magnetized head (1), is connected with four circle distributions in the upper end of cylindrical support (5)
Cantilever beam (51), the free end of every cantilever beam (51) be connected separately with the inwardly angled inclined shore (52) being arranged upward and
Described inclined shore (52) upper end converges to annular sleeve (53) circumferentially, and four lateral face magnetized heads (3) are arranged in described one by one
Cantilever beam (51) on, the setting of upper magnetized head (2) is in annular sleeve (53).
7. the magnetizer of six faces magnetcisuspension floating body according to claim 1, which is characterized in that the axial elasticity structure
Including several springs (66) being arranged between guide housing (64) lower end and fixed frame (6) upper end.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938062.0A CN107910156B (en) | 2017-10-11 | 2017-10-11 | The magnetizer and its magnetization method of six face magnetcisuspension floating bodies |
| CN201910759905.XA CN110491623B (en) | 2017-10-11 | 2017-10-11 | Magnetizing method for six-sided magnetic suspension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710938062.0A CN107910156B (en) | 2017-10-11 | 2017-10-11 | The magnetizer and its magnetization method of six face magnetcisuspension floating bodies |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910759905.XA Division CN110491623B (en) | 2017-10-11 | 2017-10-11 | Magnetizing method for six-sided magnetic suspension |
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| Publication Number | Publication Date |
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| CN107910156A CN107910156A (en) | 2018-04-13 |
| CN107910156B true CN107910156B (en) | 2019-09-13 |
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| CN201910759905.XA Expired - Fee Related CN110491623B (en) | 2017-10-11 | 2017-10-11 | Magnetizing method for six-sided magnetic suspension |
| CN201710938062.0A Active CN107910156B (en) | 2017-10-11 | 2017-10-11 | The magnetizer and its magnetization method of six face magnetcisuspension floating bodies |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910759905.XA Expired - Fee Related CN110491623B (en) | 2017-10-11 | 2017-10-11 | Magnetizing method for six-sided magnetic suspension |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109494043B (en) * | 2019-01-05 | 2024-08-20 | 湖南省三联磁电设备有限公司 | Magnetizing device with adjustable magnetizing gap |
| CN112992473B (en) * | 2021-04-19 | 2022-11-11 | 上海大学 | Be used for Halbach magnet alternately magnetization device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971878A (en) * | 2014-05-20 | 2014-08-06 | 北京京磁电工科技有限公司 | Magnetizing system |
| CN204498377U (en) * | 2015-03-24 | 2015-07-22 | 歌尔声学股份有限公司 | Magnetize structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105161251B (en) * | 2015-10-23 | 2017-02-22 | 天津博雅全鑫磁电科技有限公司 | Magnetostatic field magnetizing device at normal temperature |
| CN106158238B (en) * | 2016-07-07 | 2017-09-26 | 北京领邦智能装备股份公司 | Automatic magnetism-charging apparatus and method |
| CN206040347U (en) * | 2016-08-24 | 2017-03-22 | 姚燕 | Device for magnetize or demagnetize with permanent -magnetic field |
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2017
- 2017-10-11 CN CN201910759905.XA patent/CN110491623B/en not_active Expired - Fee Related
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971878A (en) * | 2014-05-20 | 2014-08-06 | 北京京磁电工科技有限公司 | Magnetizing system |
| CN204498377U (en) * | 2015-03-24 | 2015-07-22 | 歌尔声学股份有限公司 | Magnetize structure |
Also Published As
| Publication number | Publication date |
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| CN110491623A (en) | 2019-11-22 |
| CN107910156A (en) | 2018-04-13 |
| CN110491623B (en) | 2021-10-15 |
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Effective date of registration: 20201210 Address after: Building loftc, West Greenland Business City, Hanyuan Avenue, Yunlong District, Xuzhou City, Jiangsu Province, 221000 Patentee after: XUZHOU XINNANHU TECHNOLOGY Co.,Ltd. Address before: 310018 Xiasha Higher Education Zone, Hangzhou, Zhejiang Patentee before: HANGZHOU DIANZI University |
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