CN106890725B - A kind of lithium battery screens magnetic separator de-ironing with graphite powder - Google Patents
A kind of lithium battery screens magnetic separator de-ironing with graphite powder Download PDFInfo
- Publication number
- CN106890725B CN106890725B CN201710264320.1A CN201710264320A CN106890725B CN 106890725 B CN106890725 B CN 106890725B CN 201710264320 A CN201710264320 A CN 201710264320A CN 106890725 B CN106890725 B CN 106890725B
- Authority
- CN
- China
- Prior art keywords
- fixed
- conveyer belt
- feeding mouth
- sieve
- water tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 11
- 238000010409 ironing Methods 0.000 title claims abstract description 11
- 239000006148 magnetic separator Substances 0.000 title claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 57
- 239000010865 sewage Substances 0.000 claims description 12
- 238000000746 purification Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 16
- 239000002994 raw material Substances 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/14—Removing waste, e.g. labels, from cleaning liquid; Regenerating cleaning liquids
Abstract
The invention discloses a kind of lithium battery graphite powder to screen magnetic separator de-ironing, including deironing apparatus and cleaning device；The deironing apparatus is provided with feeding mouth, fastener, fixed plate, the first conveyer belt, electromagnetic coil, electrothermal tube, turning point, handle, sieve, fixed block, vibrator and finished product storage bin；The feeding mouth is fixed in the upper left side position of deironing apparatus；The fixed plate is vertically fixed in the lower right position of feeding mouth；First conveyer belt is fixed in the position directly below of feeding mouth；The electromagnetic coil several be uniformly arranged on the centre position of the first conveyer belt；The turning point is fixed in the upper right side position of the first conveyer belt；The particle of the present invention is entered in deironing apparatus by feeding mouth；Fastener controls the opening and closing of feeding mouth；Fixed plate makes particle be laid on the first conveyer belt；Particle is fallen on the upper left side of the first conveyer belt by feeding mouth；Electromagnetic coil makes the first conveyer belt band magnetic, makes raw material carry out removing magnetic by the first conveyer belt.
Description
Technical field
The present invention relates to a kind of mechanical equipment, is specifically that a kind of lithium battery screens magnetic separator de-ironing with graphite powder.
Background technology
At present, lithium system battery is divided into lithium battery and lithium ion battery.What mobile phone and laptop used is all lithium ion
Battery, usual people's custom is called lithium battery, and real lithium battery is rarely applied to day electronic product since danger is big
But existing lithium ion battery negative material blanking with deironing apparatus in use there is some shortcomings, it is first
First, for its iron removaling mostly only by removing iron plate iron removaling, the mode iron removaling precision of this circulation is relatively low, required by often not reaching work
Effect；Secondly, the mixing bunker of device and except iron plate cleaning when be required to be pulled down and could be cleaned, this mixture
The machine of system is difficult to dismantle, so that the workload of staff can be increased, and it is more time-consuming.
The content of the invention
It is an object of the invention to provide a kind of lithium battery graphite powder to screen magnetic separator de-ironing, to solve in above-mentioned background technology
The problem of proposition.
To achieve the above object, the present invention provides following technical solution：
A kind of lithium battery screens magnetic separator de-ironing, including deironing apparatus and cleaning device with graphite powder；The deironing apparatus is set
There are feeding mouth, fastener, fixed plate, the first conveyer belt, electromagnetic coil, electrothermal tube, turning point, handle, sieve, fixed block, vibrator
With finished product storage bin；The feeding mouth is fixed in the upper left side position of deironing apparatus；The fixed plate is vertically fixed in feeding mouth
Lower right position；First conveyer belt is fixed in the position directly below of feeding mouth；The electromagnetic coil several be uniformly arranged
In the centre position of the first conveyer belt；The turning point is fixed in the upper right side position of the first conveyer belt；The handle, which is fixed in, to be turned
The lower right of point；The sieve is fixed in the lower right position of the first conveyer belt；The fixed block is fixed in sieve end positions；
The vibrator is fixed in the lower left position of sieve；The cleaning device is provided with water tank, plug, control cabinet, water pipe, spray
Head, Sewage treatment case and water purification mouth；The water tank is fixed in the lowermost position of cleaning device；The plug is arranged on water storage
The lower left of case；The control cabinet is fixed in water tank bottom surface centre position；The water pipe lower end is fixed in the upper of control cabinet
The first conveyer belt of alignment above water tank is stretched out in square centre position, upper end；The nozzle is fixed in the upper end position of water pipe；It is described
Sewage treatment case is fixed in the upper right side position of water tank.
As the further scheme of the present invention：The fastener is fixed in the lower position of feeding mouth.
As further scheme of the invention：The electrothermal tube several be uniformly fixed between electromagnetic coil.
As further scheme of the invention：The finished product storage bin is fixed in the position directly below of sieve.
As further scheme of the invention：The water purification mouth is fixed in the lower left corner of Sewage treatment case, connects waste water
Recycling bins and water tank.
Compared with prior art, the beneficial effects of the invention are as follows：
The particle of the present invention is entered in deironing apparatus by feeding mouth；Fastener controls the opening and closing of feeding mouth；It is fixed
Plate makes particle be laid on the first conveyer belt；Particle is fallen on the upper left side of the first conveyer belt by feeding mouth；Electromagnetic coil makes the first biography
Band band magnetic is sent, makes raw material carry out removing magnetic by the first conveyer belt；Electrothermal tube plays the role of drying the first conveyer belt；User holds
Firmly handle opens the right side of the first conveyer belt by turning point；Except particle falls on sieve by the transport of the first conveyer belt after magnetic, sieve
Net screens it；Sieve moves in fixed block；Vibrator drives sieve vibration, accelerates the breakneck acceleration of sieve；Finished product
Storage bin plays the role of storing finished product particle；Water tank plays the role of storing water source；Plug, which plays, blocks water tank water inlet
The effect of mouth；Control cabinet control water source is sprayed from the nozzle of water pipe upper end, and the first conveyer belt is cleaned；Water purification mouth plays
Purify the effect of waste water；The design structure of the present invention is simple, and favorable working performance is highly practical, fully presents modernization instruments
The characteristics of, development prospect is very good.
Brief description of the drawings
Fig. 1 is the structure diagram that lithium battery graphite powder screens magnetic separator de-ironing.
Fig. 2 screens storage tank structure schematic diagram in magnetic separator de-ironing for lithium battery graphite powder.
Fig. 3 screens mesh structure schematic diagram in magnetic separator de-ironing for lithium battery graphite powder.
In figure：1- deironing apparatus, 2- cleaning devices, 3- feeding mouths, 4- fasteners, 5- fixed plates, 6- turning points, 7- handles,
8- plugs, the first conveyer belts of 9-, 10- electrothermal tubes, 11- electromagnetic coils, 12- sieves, 13- fixed blocks, 14- vibrators, 15- controls
Case, 16- water pipes, 17- nozzles, 18- water purification mouths, 19- finished product storage bins, 20- Sewage treatment casees, 21- water tanks.
Embodiment
The technical solution of this patent is described in more detail with reference to embodiment.
- 3 are please referred to Fig.1, a kind of lithium battery screens magnetic separator de-ironing, including deironing apparatus 1 and cleaning device 2 with graphite powder；Institute
State deironing apparatus 1 be provided with feeding mouth 3, fastener 4, fixed plate 5, the first conveyer belt 9, electromagnetic coil 11, electrothermal tube 10, turning point 6,
Handle 7, sieve 12, fixed block 13, vibrator 14 and finished product storage bin 19；The feeding mouth 3 is fixed in the upper left of deironing apparatus 1
Orientation is put, and particle is entered in deironing apparatus 1 by feeding mouth 3；The fastener 4 is fixed in the lower position of feeding mouth 3, fastener
The opening and closing of 4 control feeding mouths 3；The fixed plate 5 is vertically fixed in the lower right position of feeding mouth 3, and fixed plate 5 makes broken
Material is laid on the first conveyer belt 9；First conveyer belt 9 is fixed in the position directly below of feeding mouth 3, and particle is by feeding mouth 3
Fall on the upper left side of the first conveyer belt 9；Several are uniformly arranged on the centre position of the first conveyer belt 9 to the electromagnetic coil 11, electricity
Magnetosphere 11 makes the first conveyer belt 9 make raw material carry out removing magnetic by the first conveyer belt 9 with magnetic；Several are uniform for the electrothermal tube 10
It is fixed between electromagnetic coil 11, electrothermal tube 10 plays the role of drying the first conveyer belt 9；The turning point 6 is fixed in the first transmission
With 9 upper right side position；The handle 7 is fixed in the lower right of turning point 6, and user holds handle 7 and opens first by turning point 6
The right side of conveyer belt 9；The sieve 12 is fixed in the lower right position of the first conveyer belt 9, except particle is transmitted by first after magnetic
The transport of band 9 falls on sieve 12, and sieve 12 screens it；The fixed block 13 is fixed in 12 end positions of sieve, sieve
12 movements in fixed block 13；The vibrator 14 is fixed in the lower left position of sieve 12, and vibrator 14 drives sieve 12 to shake
It is dynamic, accelerate the breakneck acceleration of sieve 12；The finished product storage bin 19 is fixed in the position directly below of sieve 12, finished product storage bin 19
Play the role of storing finished product particle；The cleaning device 2 is provided with water tank 21, plug 8, control cabinet 15, water pipe 16, nozzle
17th, Sewage treatment case 20 and water purification mouth 18；The water tank 21 is fixed in the lowermost position of cleaning device 2, and water tank 21 rises
To the effect at storage water source；The plug 8 is arranged on the lower left of water tank 21, and plug 8, which plays, blocks 21 water inlet of water tank
Effect；The control cabinet 15 is fixed in 21 bottom surface centre position of water tank；16 lower end of water pipe is fixed in control cabinet 15
Top centre position, the first conveyer belt 9 of the top of water tank 21 alignment is stretched out in upper end；The nozzle 17 is fixed in the upper of water pipe 16
End position, control cabinet 15 control water source to be sprayed from the nozzle 17 of 16 upper end of water pipe, the first conveyer belt 9 are cleaned；It is described
Sewage treatment case 20 is fixed in the upper right side position of water tank 21；The water purification mouth 18 is fixed in the lower-left of Sewage treatment case 20
Angle, connection Sewage treatment case 20 and water tank 21, water purification mouth 18 play the role of purifying waste water.
Principle explanation：Raw material after crushing is poured into deironing apparatus 1 by feeding mouth 3, feeding mouth is closed by fastener 4
3, the first conveyer belt 9 and electromagnetic coil 11 are opened, making the first conveyer belt 9, then particle below fixed plate 5 by uniformly being put down with magnetic
It is spread out on the first conveyer belt 9, transports to the top of sieve 12, on the first conveyer belt 9, acceptable material enters the impurity absorption with magnetic
To the top of sieve 12, Vibration on Start-up device 14 makes sieve 12 quickly be screened to the particle of top, and the particle of qualified size enters
In finished product storage bin 19, the particle of bulk is stayed on sieve 12, and opening the right side of sieve 12 by handle is handled, and work finishes
Afterwards, opening control cabinet 15 makes water source be sprayed by nozzle 17 by water pipe 16 to clean the first conveyer belt 9, and waste water falls into waste water
Flowed back to again after water purification mouth 18 is filtered by the effect of gravity in recycling bins 20 stand-by in water tank 21.
The better embodiment of this patent is explained in detail above, but this patent is not limited to above-mentioned embodiment party
Formula, can also be on the premise of this patent objective not be departed from the knowledge that one skilled in the relevant art possesses
Make a variety of changes.
Claims (1)
1. a kind of lithium battery screens magnetic separator de-ironing, including deironing apparatus with graphite powder（1）And cleaning device（2）；It is characterized in that, institute
State deironing apparatus（1）It is provided with feeding mouth（3）, fastener（4）, fixed plate（5）, the first conveyer belt（9）, electromagnetic coil（11）, electricity
Heat pipe（10）, turning point（6）, handle（7）, sieve（12）, fixed block（13）, vibrator（14）With finished product storage bin（19）；It is described
Feeding mouth（3）It is fixed in deironing apparatus（1）Upper left side position；The fixed plate（5）Vertically it is fixed in feeding mouth（3）Bottom right
Put in orientation；First conveyer belt（9）It is fixed in feeding mouth（3）Position directly below；The electromagnetic coil（11）Several are uniform
It is arranged on the first conveyer belt（9）Centre position；The turning point（6）It is fixed in the first conveyer belt（9）Upper right side position；It is described
Handle（7）It is fixed in turning point（6）Lower right；The sieve（12）It is fixed in the first conveyer belt（9）Lower right position；It is described
Fixed block（13）It is fixed in sieve（12）End positions；The vibrator（14）It is fixed in sieve（12）Lower left position；Institute
State cleaning device（2）It is provided with water tank（21）, plug（8）, control cabinet（15）, water pipe（16）, nozzle（17）, Sewage treatment case
（20）With water purification mouth（18）；The water tank（21）It is fixed in cleaning device（2）Lowermost position；The plug（8）Set
In water tank（21）Lower left；The control cabinet（15）It is fixed in water tank（21）Bottom surface centre position；The water pipe
（16）Lower end is fixed in control cabinet（15）Top centre position, upper end stretch out water tank（21）Top is directed at the first conveyer belt
（9）；The nozzle（17）It is fixed in water pipe（16）Upper end position；The Sewage treatment case（20）It is fixed in water tank（21）'s
Upper right side position；The fastener（4）It is fixed in feeding mouth（3）Lower position；The electrothermal tube（10）Several are uniformly solid
It is connected on electromagnetic coil（11）Between；The finished product storage bin（19）It is fixed in sieve（12）Position directly below；The water purification mouth
（18）It is fixed in Sewage treatment case（20）The lower left corner, connect Sewage treatment case（20）And water tank（21）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710264320.1A CN106890725B (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery screens magnetic separator de-ironing with graphite powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710264320.1A CN106890725B (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery screens magnetic separator de-ironing with graphite powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106890725A CN106890725A (en) | 2017-06-27 |
| CN106890725B true CN106890725B (en) | 2018-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710264320.1A Active CN106890725B (en) | 2017-04-21 | 2017-04-21 | A kind of lithium battery screens magnetic separator de-ironing with graphite powder |
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| CN (1) | CN106890725B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107649370A (en) * | 2017-10-12 | 2018-02-02 | 江苏昊晟塑业科技有限公司 | A kind of PE Processing equipment |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2653686B1 (en) * | 1989-10-27 | 1992-03-27 | Sovadec Valorisation Dechets | PROCESS FOR THE TREATMENT OF WASTE FOR THE RECOVERY OF ORGANIC MATERIAL AND DEVICE FOR ITS IMPLEMENTATION. |
| CN101543804B (en) * | 2009-05-07 | 2011-07-20 | 张寻 | Electromagnetic damping effect classifier of non-magnetic material |
| CN201529570U (en) * | 2009-11-17 | 2010-07-21 | 姚志超 | Novel high gradient high intensity magnetic tape-type water/magnetic separator |
| CN101905236B (en) * | 2010-07-15 | 2012-10-31 | 陆锦珠 | Automatic household garbage classification treatment method and device |
| CN202148039U (en) * | 2011-07-08 | 2012-02-22 | 贵州航天风华精密设备有限公司 | Filtering and conveying device for kitchen refuse disposal equipment |
| CN203425908U (en) * | 2013-08-17 | 2014-02-12 | 姜堰市沪兴冶金炉料利用有限公司 | Water washing and magnetic separation device for iron powder |
| CN204638351U (en) * | 2015-03-18 | 2015-09-16 | 泰州航宇电碳制品有限公司 | Knot screen |
| CN204933682U (en) * | 2015-09-21 | 2016-01-06 | 林素花 | A kind of wet type breeze self-sizing equipment |
| CN205462720U (en) * | 2016-01-29 | 2016-08-17 | 宫莉萍 | Remove magnetic device |
| CN205550561U (en) * | 2016-04-20 | 2016-09-07 | 象山沛公堂中药科技有限公司 | Traditional chinese medicine draws screening plant |
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2017
- 2017-04-21 CN CN201710264320.1A patent/CN106890725B/en active Active
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| CN106890725A (en) | 2017-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170725 Address after: 100052 Beijing City, Xicheng District Xuanwu Wai Avenue No. 10 Zhuangsheng Plaza Central Office South 12 1225-1242 room Applicant after: Chen Ping Address before: Longgang District of Shenzhen City, Guangdong province 518000 de Zheng Lu Long Fu Yi Cun building on the third floor Applicant before: Wang Shuang |
|
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wei Shaobo Inventor after: Xu Baohua Inventor after: Cai Zhiyuan Inventor before: Wang Shuang |
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20180329 Address after: No. 1, No. 4, blue sea road, high tech Industrial Development Zone, Yantai, Shandong Applicant after: Yantai lithium-ion Environmental Protection Technology Co.,Ltd. Address before: 100052 Beijing City, Xicheng District Xuanwu Wai Avenue No. 10 Zhuangsheng Plaza Central Office South 12 1225-1242 room Applicant before: Chen Ping |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A graphite powder screening iron remover for lithium battery Effective date of registration: 20211215 Granted publication date: 20180501 Pledgee: Yantai financing guarantee Group Co.,Ltd. Pledgor: Yantai lithium-ion Environmental Protection Technology Co.,Ltd. Registration number: Y2021980015018 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20180501 Pledgee: Yantai financing guarantee Group Co.,Ltd. Pledgor: Yantai lithium-ion Environmental Protection Technology Co.,Ltd. Registration number: Y2021980015018 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |