CN103553439B - Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste - Google Patents
Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste Download PDFInfo
- Publication number
- CN103553439B CN103553439B CN201310472394.6A CN201310472394A CN103553439B CN 103553439 B CN103553439 B CN 103553439B CN 201310472394 A CN201310472394 A CN 201310472394A CN 103553439 B CN103553439 B CN 103553439B
- Authority
- CN
- China
- Prior art keywords
- paste
- steel bar
- cold
- cathode
- smashing
- 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.)
- Active
Links
Abstract
The invention discloses a cold ramming paste and a cathode carbon block and steel bar combined structure with joint filled by the cold ramming paste, and aims at solving the technical problems of poor electric conductivity and heat conductivity of a conventional cold ramming paste and poor corrosion resistance. The cold ramming paste is prepared by the following raw materials by weight: 8%-20% of graphite powder, 55%-70% of asphalt, 10%-32% of anthracene oil and 3%-6% of an additive. Electrical resistivity of the cold ramming paste is below 45 [mu][ohm].m; compressive strength of the cold ramming paste is 20-25 MPa and a ramming temperature is 8-22.5 DEG C. The cold ramming paste has significantly reduced electrical resistivity and relatively high electric conductivity and corrosion resistance. By applying the cold ramming paste in the cathode carbon block and steel bar combined structure of an aluminium electrolytic cell, pressure drop of cathode steel bar paste and pressure drop of hearth bottom of the aluminium electrolytic cell are effectively reduced; and further power consumption per ton aluminium and CO2 emission of aluminium electrolysis enterprises can be reduced.
Description
Technical field
The present invention relates to cold the smashing of a kind of used for aluminium electrolysis and stick with paste and adopt this cold cathode carbon pieces rod iron unitized construction of sticking with paste joint filling of smashing.
Background technology
Although China's aluminum electrolyzation technology is being caught up with advanced international standard aspect industrialization electrolyzer capacity, China's aluminium cell is in life-span, current efficiency, power consumption, environmental pollution with to the aspects such as construction workers ' health harm and international most advanced level some gap also.The trend that just international technology develops in recent years, one of important measures of dwindling this gap are exactly to adopt cold the smashing of high-quality to stick with paste monolithic cathode charcoal piece, thereby reduce energy consumption, raising current efficiency, the life-span of improving electrolyzer.
In aluminium cell, need to there is well behaved ramming paste material to fill the gap between gap, cathode carbon pieces and the rod iron between cathode carbon pieces, the character of ramming paste has important impact to the life-span of aluminium cell and current consumption.Ramming paste can be divided into heat by its binding agent softening temperature and construction temperature to be smash and sticks with paste and the cold paste of smashing, and heat smashes to stick with paste to be needed to be heated to more than 100 ℃ before making firm by ramming, makes firm by ramming in process and can give out a large amount of tar flue gas, makes that construction environment is severe, labour intensity increase.The cold paste of smashing is because construction temperature is low, do not have pitch damage by fume to be applied to more and more widely electrolysis of aluminum industry, and the cold paste of smashing of used for aluminium electrolysis also must possess good electrical and thermal conductivity performance, erosion-resisting characteristics simultaneously.The cold paste of smashing of domestic production at present, resistivity is generally at 60～90 μ m, and there is the much cold research of sticking with paste resistivity of smashing of being devoted to reduce industry inside, but have now a kind of effective means, can not make cold resistivity of smashing paste significantly reduce.Therefore study a kind of cold paste of smashing of used for aluminium electrolysis of low-resistivity, to China's electrolysis of aluminum industry energy-saving consumption reduction, a reduction ton aluminium production cost, have earth shaking meaning.
Summary of the invention
The technical problem to be solved in the present invention is to provide the cold paste of smashing of used for aluminium electrolysis that a kind of electrical and thermal conductivity performance is good, corrosion resistance is strong, and adopts this cold cathode carbon pieces rod iron unitized construction of sticking with paste joint filling of smashing.
For solving the problems of the technologies described above, used for aluminium electrolysis of the present invention is cold smashes that to stick with paste be that raw material by following weight percent is prepared from: Graphite Powder 99 8%～20%, pitch 55%～70%, carbolineum 10%～32%, additive 3%～6%.
The cold paste of smashing of used for aluminium electrolysis that adopts said ratio to prepare, its beneficial effect is: the cold resistivity of smashing paste of the present invention is low to moderate below 45 μ m, and ultimate compression strength is 20～25MPa, making temperature firm by ramming is 8～22.5 ℃.Cold smashing of the prior art stuck with paste resistivity conventionally between 60～90 μ m, and reduce the consumption of aggregate at the consumption that used for aluminium electrolysis of the present invention is cold has improved binding agent in smashing paste greatly simultaneously, the kind of preferred aggregate, binding agent, reasonably optimizing the proportion relation of each component, thereby overcome prejudice of the prior art, cold resistivity of smashing paste is significantly reduced, obtained unforeseeable technique effect.The present invention is cold to smash in the proportioning of paste, and the shared weight of Graphite Powder 99 that anti-sodium aggressiveness is good is only 8%～20% of raw material gross weight, and proportion is less, and cost is lower, but can effectively improve cold conductivity and erosion-resisting characteristics of smashing paste.This cold paste of smashing is applied to aluminium cell, can effectively reduce the cathode steel bar thickener pressure drop of aluminium cell and more than furnace bottom pressure drop 20mV, especially be used in conjunction with the cathode steel bar of high conductive material, more be conducive to reduce the furnace bottom pressure drop of aluminium cell, and then contribute to electrolysis of aluminum enterprise to reduce ton aluminium power consumption, reduce CO
2discharge.
In technique scheme, preferred, describedly coldly smash that to stick with paste be that raw material by following weight percent is prepared from: Graphite Powder 99 10%～15%, pitch 60%～65%, carbolineum 15%～25%, additive 4%～5%.The cold paste of smashing that adopts this preferred proportioning raw materials to prepare, its every physical and chemical index is more excellent.
Preferably, described additive is at least one in 2,4-dinitrotoluene (DNT), vinylbenzene, Meta-dinitrobenzene.Add described additive can make pitch oxidation, asphaltene molecule conclude into larger molecule, increase the coking amount of pitch, and then cold volume density, ultimate compression strength of smashing paste is all increased, but also there is certain plasticization effect.
Preferably, described pitch is modified pitch, and the cold paste quality of smashing that adopts modified pitch to prepare is higher, and is convenient to store and transportation; The granularity of described Graphite Powder 99 is 1mm～0mm, adopts the Graphite Powder 99 of this size range, can effectively increase cold ultimate compression strength of smashing paste.
The above-mentioned cold technological process of production of smashing paste is as follows: select aggregate (Graphite Powder 99) that proportioning is good and binding agent (pitch and carbolineum) kneading (wet mixing) in kneading machine according to the above ratio, the wet mixing time is 15min, wet mixing temperature is 85 ℃, the heat paste taking out is put into shaping mould extrusion molding cooling from kneading machine.
Cathode carbon pieces rod iron unitized construction of the present invention, comprise cathode carbon pieces, cathode steel bar, wherein, in described cathode carbon pieces bottom, be provided with along its length steel bar trough, described cathode steel bar is arranged in described steel bar trough, is filled with the above-mentioned cold paste of smashing in the gap between described cathode steel bar and described steel bar trough.
Adopt the above-mentioned cold cathode carbon pieces rod iron unitized construction of sticking with paste joint filling of smashing, can effectively reduce the pressure drop of aluminum cell cathode steel bar thickener and more than furnace bottom pressure drop 20mV, especially be used in conjunction with the cathode steel bar of high conductive material, be more conducive to reduce the furnace bottom pressure drop of electrolyzer.Contribute to electrolysis of aluminum enterprise to reduce ton aluminium power consumption, reduce CO
2discharge.
Preferably, described cathode steel bar is a monoblock type cathode steel bar on cathode carbon pieces length direction, and such structure makes aluminium electrolytic cell cathode more stable, and conductive effect is better; Or being provided with at least two cathode steel bars at left end and the right-hand member of described cathode carbon pieces, such structure can make cathode carbon pieces horizontal current component reduce, thereby reduce power consumption, also can extend the work-ing life of aluminium cell; The cross-sectional shape of described cathode steel bar is the combination of rectangle, circle, semicircle, ellipse, half elliptic or above-mentioned shape, the cross-sectional shape of described steel bar trough is corresponding with the cross-sectional shape of described cathode steel bar, such structure can increase the conductive area of cathode steel bar, the efficiency that improves electric current, makes aluminium electrolytic cell cathode conductive effect better.
Accompanying drawing explanation
Fig. 1 is the side-looking direction schematic diagram of cathode carbon pieces rod iron unitized construction of the present invention.
Fig. 2 be cathode carbon pieces rod iron unitized construction of the present invention look up direction schematic diagram.
In figure, 1 is that cathode carbon pieces, 2 is that cathode steel bar, 3 is steel bar trough.
Embodiment
The present invention is cold smashes that to stick with paste be that material by following weight percent is prepared from: Graphite Powder 99 8%～20%, pitch 60%～70%, anthracene 10%～32%, additive 3%～6%.
The cold paste of smashing of used for aluminium electrolysis that adopts said ratio to prepare has good plasticity, can use at ambient temperature, smokelessly, constructing operation is convenient, make density firm by ramming high, and its resistivity significantly reduces, can be low to moderate below 45 μ m, and the cold consumption that has greatly improved binding agent in paste of smashing of the present invention reduces the consumption of aggregate simultaneously, preferably the kind of aggregate, binding agent, reasonably optimizing the proportion relation of each component, thereby overcome prejudice of the prior art, cold resistivity of smashing paste is significantly reduced, obtained unforeseeable technique effect.The present invention is cold to smash in the proportioning of paste, and the shared weight percent of Graphite Powder 99 that anti-sodium aggressiveness is good is only 8%～20%, and proportion is less, and cost is lower, but can effectively improve cold conductivity and erosion-resisting characteristics of smashing paste.This cold paste of smashing is applied to aluminium cell, can effectively reduce the cathode steel bar thickener pressure drop of aluminium cell and more than furnace bottom pressure drop 20mV, especially be used in conjunction with the cathode steel bar of high conductive material, more be conducive to reduce the furnace bottom pressure drop of aluminium cell, and then contribute to electrolysis of aluminum enterprise to reduce ton aluminium power consumption, reduce CO
2discharge.
Preferably, describedly coldly smash that to stick with paste be that raw material by following weight percent is prepared from: Graphite Powder 99 10%～15%, pitch 60%～65%, carbolineum 15%～25%, additive 4%～5%.The cold paste of smashing that adopts this preferred proportioning raw materials to prepare, its every physical and chemical index is more excellent.
Preferably, described additive is at least one in 2,4-dinitrotoluene (DNT), vinylbenzene, Meta-dinitrobenzene; Described pitch is modified pitch; The granularity of described Graphite Powder 99 is 1mm～0mm.Add described additive can make pitch oxidation, asphaltene molecule conclude into larger molecule, increase the coking amount of pitch, and then cold volume density, ultimate compression strength of smashing paste is all increased, but also there is certain plasticization effect.The cold paste quality of smashing that adopts modified pitch to prepare is higher, and is convenient to store and transportation; Adopt the Graphite Powder 99 of above-mentioned size range, can effectively increase cold ultimate compression strength of smashing paste.
The following examples are just used for describing in detail the present invention, and limit the scope of the invention never in any form, and wherein related industrial raw material if no special instructions, is commercially available conventional industrial raw material.
Embodiment 1: the cold paste proportioning raw materials of smashing is as shown in table 1 below.
Embodiment 2: the cold paste proportioning raw materials of smashing is as shown in table 2 below.
Respectively the cold paste of smashing of embodiment 1 and embodiment 2 preparations is carried out to physical and chemical performance analysis, the testing method of the cold physical and chemical index of smashing paste is as follows: the cold paste of smashing of getting corresponding coupling, steel die in thickener, laboratory is heated to (36 ± 2) ℃, then thickener is poured in steel die, minutes 4 times successively sturdy with pneumatic hammer, understands the tamping of thickener.After tamping, at the thick burnt grain of surface coverage one deck 50 mm, in the little stoving oven of experiment, heating curve roasting in accordance with regulations (heating up consistent with electrobath start), after naturally cooling, observes the situation after thickener roasting and makes sample.Analysis volume density, resistivity, compressive strength, ash content and true density.The cold physical and chemical index of smashing paste that the proportioning raw materials of employing embodiment 1 and embodiment 2 makes is compared with cold national standard of smashing paste, and result is as shown in table 3 below.
In embodiment 1 and embodiment 2, the cold physical and chemical index of smashing paste can be found out, the present invention is cold, and the resistivity of smashing paste is starkly lower than national standard, can be low to moderate below 45 μ m, its ultimate compression strength also obviously improves, make temperature firm by ramming low, indices reaches or is better than national standard and the cold paste of smashing of the prior art.
Cathode carbon pieces rod iron unitized construction of the present invention as depicted in figs. 1 and 2, comprise cathode carbon pieces 1, cathode steel bar 2, in described cathode carbon pieces 1 bottom, be provided with along its length steel bar trough 3, described cathode steel bar 2 is arranged in described steel bar trough 3, is filled with the above-mentioned cold paste of smashing in the gap between described cathode steel bar and described steel bar trough.
Preferably, described cathode steel bar 2 is a monoblock type cathode steel bar on cathode carbon pieces 1 length direction; The left end of described cathode carbon pieces 1 and right-hand member are provided with at least two cathode steel bars 2; The cross-sectional shape of described cathode steel bar 2 is the combination of rectangle, circle, semicircle, ellipse, half elliptic or above-mentioned shape, and the cross-sectional shape of described steel bar trough 3 is corresponding with the cross-sectional shape of described cathode steel bar 2.This cathode carbon pieces rod iron unitized construction, can reduce power consumption and extend work-ing life of aluminium cell, improves the efficiency of electric current, makes aluminium electrolytic cell cathode conductive effect better.
Above-mentioned cathode carbon pieces rod iron unitized construction, when assembling, without the cold paste of smashing is heated, at room temperature, adopts plug ramming machine that cold smashing stuck with paste in the solid space between cathode carbon pieces 1 and cathode steel bar 2 of bundle, and bundle is solid closely knit.When if temperature is lower, before cathode steel bar 2 assembling, 24h puts the cold paste of smashing of not opening packing to the top of charcoal piece in pit furnace, utilize the heating pit furnace of cathode blocks 1 to stick with paste heating to cold smashing, with heat insulation, cover, start before assembling, with infrared temperature-measuring gun, measure thickener temperature, when temperature reaches 25 ℃, prick solid; Or directly with the heating of fried machine: first will coldly smash paste and once pulverize and put into again fried machine and heat, early stage, heat-processed was without the agitating function that starts fried machine, after more than temperature to 25 ℃, the block cold paste self-dispersing of smashing, gentle agitation, homogeneous heating approximately 5 minutes, utilize infrared temperature-measuring gun to measure in time temperature (can adjust heat-up time according to practical situation), the special-purpose cold paste temperature of smashing is evenly controlled between 25 ~ 30 ℃, adopt plug ramming machine that cold smashing stuck with paste in the solid space between cathode carbon pieces 1 and cathode steel bar 2 of bundle, prick solid closely knit.
In conjunction with the accompanying drawings and embodiments the present invention is described in detail above, but, person of ordinary skill in the field can understand, do not departing under the prerequisite of aim of the present invention, can also each design parameter in above-described embodiment be changed, form a plurality of specific embodiments, be common variation range of the present invention, at this, describe in detail no longer one by one.
Claims (9)
1. the cold paste of smashing, is characterized in that, describedly coldly smashes that to stick with paste be that raw material by following weight percent is prepared from: Graphite Powder 99 8%～20%, pitch 55%～70%, carbolineum 10%～32%, additive 3%～6%.
2. the cold paste of smashing according to claim 1, is characterized in that, describedly coldly smashes that to stick with paste be that raw material by following weight percent is prepared from: Graphite Powder 99 10%～15%, pitch 60%～65%, carbolineum 15%～25%, additive 4%～5%.
3. the cold paste of smashing according to claim 1 and 2, is characterized in that, described additive is at least one in 2,4-dinitrotoluene (DNT), vinylbenzene, Meta-dinitrobenzene.
4. the cold paste of smashing according to claim 1, is characterized in that, described pitch is modified pitch.
5. the cold paste of smashing according to claim 1, is characterized in that the granularity≤1mm of described Graphite Powder 99.
6. a cathode carbon pieces rod iron unitized construction, comprise cathode carbon pieces, cathode steel bar, it is characterized in that, in described cathode carbon pieces bottom, be provided with along its length steel bar trough, described cathode steel bar is arranged in described steel bar trough, is filled with the cold paste of smashing claimed in claim 1 in the gap between described cathode steel bar and described steel bar trough.
7. cathode carbon pieces rod iron unitized construction according to claim 6, is characterized in that, described cathode steel bar is a monoblock type cathode steel bar on cathode carbon pieces length direction.
8. cathode carbon pieces rod iron unitized construction according to claim 6, is characterized in that, at left end and the right-hand member of described cathode carbon pieces, is provided with at least two cathode steel bars.
9. cathode carbon pieces rod iron unitized construction according to claim 6, it is characterized in that, the cross-sectional shape of described cathode steel bar is the combination of rectangle, circle, semicircle, ellipse, half elliptic or above-mentioned shape, and the cross-sectional shape of described steel bar trough is corresponding with the cross-sectional shape of described cathode steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310472394.6A CN103553439B (en) | 2013-10-11 | 2013-10-11 | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310472394.6A CN103553439B (en) | 2013-10-11 | 2013-10-11 | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103553439A CN103553439A (en) | 2014-02-05 |
| CN103553439B true CN103553439B (en) | 2014-11-26 |
Family
ID=50007859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310472394.6A Active CN103553439B (en) | 2013-10-11 | 2013-10-11 | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103553439B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648476B (en) * | 2016-03-15 | 2018-06-26 | 中冶天工集团有限公司 | A kind of aluminium cell cold ramming paste material construction technology for high altitude localities |
| CN105803486A (en) * | 2016-05-16 | 2016-07-27 | 中电投宁夏能源铝业青鑫炭素有限公司 | Preparation method for cathode cold ramming paste for aluminum electrolysis cell |
| CN106435644A (en) * | 2016-12-05 | 2017-02-22 | 中南大学 | Tamping paste for aluminum electrolytic cell and use method of tamping paste |
| CN107557813B (en) * | 2017-09-06 | 2020-11-17 | 兰州理工大学 | Cold ramming paste for electrolytic aluminum cathode tank integral furnace building technology |
| CN107435157A (en) * | 2017-10-10 | 2017-12-05 | 高西胜 | It is a kind of not need the filling of carbon block middle part to prick solid cathode assembling method |
| CN115159989A (en) * | 2020-10-14 | 2022-10-11 | 宁夏宁平炭素有限责任公司 | Production method of carbon block for large-section submerged arc furnace |
| CN112853403B (en) * | 2021-01-11 | 2021-12-07 | 山西沁新能源集团股份有限公司 | Prebaked anode, and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010202A (en) * | 2010-12-10 | 2011-04-13 | 昆明冶金研究院 | Method for preparing cold ramming paste for electrolytic aluminum |
| CN102850072A (en) * | 2012-10-08 | 2013-01-02 | 朱岳屏 | Carbon material cold ramming paste |
-
2013
- 2013-10-11 CN CN201310472394.6A patent/CN103553439B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010202A (en) * | 2010-12-10 | 2011-04-13 | 昆明冶金研究院 | Method for preparing cold ramming paste for electrolytic aluminum |
| CN102850072A (en) * | 2012-10-08 | 2013-01-02 | 朱岳屏 | Carbon material cold ramming paste |
Non-Patent Citations (7)
| Title |
|---|
| .中国铝用阴极冷捣糊研究现状.《国内外会议论文全文数据库》.2010,全文. * |
| 俞小花 * |
| 冷捣糊的实验和讨论;樊留锁;《炭素技术》;19940228;全文 * |
| 方宁 * |
| 樊留锁.冷捣糊的实验和讨论.《炭素技术》.1994,全文. * |
| 谢刚 * |
| 路辉 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103553439A (en) | 2014-02-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103553439B (en) | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste | |
| CN103484896B (en) | A kind of electrolgtic aluminium low cost carbon annode and preparation method thereof | |
| CN100580146C (en) | Method for producing one-dipping two-baking anode carbon block | |
| CN101723357B (en) | Production process of high-density carbon product | |
| CN102101664B (en) | High-strength high-graphite carbon electrode and preparation method thereof | |
| CN103449401B (en) | Preparation method of high-graphite cold ramming paste | |
| CN103952721B (en) | A kind of blue charcoal base carbon anode used for aluminium electrolysis and preparation method thereof | |
| CN105967718B (en) | The graphite anode for magnesium electrolysis of resistance to high current and its preparation process | |
| CN105884357B (en) | It is a kind of for hot-forming graphite jig material and preparation method thereof | |
| CN103992807B (en) | Method for producing carbonized coal/coke for gasification by large-scale tamping coal cake on coke oven | |
| CN110615680B (en) | Graphite electrode with GHP phi 960-phi 1420mm super-large specification and production method thereof | |
| CN105803486A (en) | Preparation method for cathode cold ramming paste for aluminum electrolysis cell | |
| CN102758220A (en) | Distributing method of prebaked anode for aluminum electrolysis | |
| CN103601173A (en) | Method for producing carbon product by ball pressing technology | |
| CN103803552A (en) | Preparation method of industrial silicon smelting reducer | |
| CN105347824A (en) | Preparation method of cold ramming paste specially used for submerged arc furnace whole furnace construction | |
| CN105347825A (en) | Preparation method of high-strength low-electrical resistance normal-temperature cold ramming paste | |
| CN100494507C (en) | High-density semi-graphite cathode carbon block and method for producing same | |
| CN103882471A (en) | Anode material for fluorine production and preparation method of anode material | |
| CN105645396B (en) | A kind of continous way direct current superhigh temperature graphitizing electric furnace and application method | |
| CN102560540B (en) | Phosphorus pig iron cast negative electrode assembled carbon block | |
| CN102557016B (en) | Anthracite graphitization process | |
| CN104372373A (en) | Method for preparing anode material for preparing fluorine by utilizing needle coke | |
| CN100480431C (en) | Production process for graphitized cathode | |
| CN102260884B (en) | Method for preparing blocky graphite anode with high density and low resistivity in short process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160425 Address after: 450001 No. 3, No. 10, Acacia Street, Zhengzhou hi tech Development Zone, Henan, 105 Patentee after: ZHENGZHOU SIDI NEW MATERIAL CO., LTD. Address before: 450001 Henan Province, Zhengzhou city high tech Development Zone Long Chun Road No. 11 Patentee before: Zhengzhou Jingwei Technology Industry Co., Ltd. |