CN103233731A - Coal cutting method with multiple demonstration knifes - Google Patents
Coal cutting method with multiple demonstration knifes Download PDFInfo
- Publication number
- CN103233731A CN103233731A CN2013101288825A CN201310128882A CN103233731A CN 103233731 A CN103233731 A CN 103233731A CN 2013101288825 A CN2013101288825 A CN 2013101288825A CN 201310128882 A CN201310128882 A CN 201310128882A CN 103233731 A CN103233731 A CN 103233731A
- Authority
- CN
- China
- Prior art keywords
- coal
- cutting
- demonstration
- winning machine
- cutter
- 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.)
- Granted
Links
Images
Landscapes
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a coal cutting method with multiple demonstration knifes, which comprises: the step (1): a coal cutter carries out coal cutting for the coal mining working face with the first i demonstration knife, wherein, i=1, 2,...m, and the coal cutter adjusts the cutting position and cutting direction according to the top and the bottom of the coal mining working surface; step (2): if the coal cutting locus of the coal cutter does not contact the top or bottom of the coal mining working surface, the coal cutting track of the ith demonstration knife is obtained, and if the coal cutting track of the coal cutter contacts the top or bottom of the coal mining working surface, the step (1) is repeated; the step (3): the step (1) and the step (2) are repeated, and the coal cutting tracks of the i+1-n demonstration knife of the coal cutter are obtained, wherein the n>m; the step (4): the coal cutter uses the coal cutting tracks of the i-n demonstration knifes as a memory coal cutting cycle, and carries automatically circulated coal cutting on the coal mining working face. The method provided by the invention carries out memory coal cutting by multiple demonstration knifes, thereby effectively reducing the influence on memory coal cutting caused by single demonstration knife, and minimizing cutting of rocks at the coal mining working face bottom, improving the coal cutting effect, and improving the coal cutting stability.
Description
Technical field
The present invention relates to a kind of coal cutting method, relate in particular to a kind of many demonstration cutter memory coal cutting methods.
Background technology
Along with improving constantly of coal mining mechanization degree, coal-winning machine is used widely in progress of coal mining, the working environment of coal mining is complicated abominable, especially in the recovery process of thin seam working surface, the coal-winning machine operating personnel are handicapped, and constantly following the coal-winning machine operation will significantly increase labor intensity of operating personnel.
Generally adopt single demonstration cutter memory coal cutting method that coal is carried out automatic tapping to the coal seam in the existing progress of coal mining, in order to reduce labor intensity of operating personnel for this reason.So-called single demonstration cutter memory coal cutting method refers to that operating personnel operate coal-winning machine and cut a demonstration cutter along the work plane coal seam earlier, to the demonstrate parameter such as lead, angle of cutter of coal-winning machine deposits computer in, carrying out since then mined automatically, and adjusts automatically by the memory parameter of Computer Storage.Particularly, in the coal process is lancinated in single demonstration, the coal cutting situation that operating personnel will constantly ceaselessly observe coal-winning machine, discovery is cut the top, will in time be adjusted the coal mining machine roller height when cutting the end, being cut part to guarantee all is the coal seam, such one lancinates, coal mining machine roller always ceaselessly is among the adjustment, such cut a cutter coal operating process as the demonstration cutter, and when next lancinates coal, the cylinder of coal-winning machine repeats coal height and the angle of lancinating of demonstrating, and finishes the operating process of demonstration cutter automatically.
But, when reality memory coal cutting process, cut the position that each cutter coal all will ceaselessly be adjusted coal mining machine roller, reach requirement to guarantee the coal cutting effect, and the coal cutting operating process of the cutter that can not repeat simply to demonstrate.So-called " demonstration cutter " is to be non-existent in the practice, and the error that operating personnel occur in the cylinder position process of adjusting the demonstration cutter will be gone down by unlimited circulation, influence the coal cutting effect.For example, when operating personnel adjust the demonstration cutter, the error of downward 200mm appears in a certain position cylinder, and height and the angle of the cutter that when automatically same position is cut in the memory coal cutting, also will repeat to demonstrate, namely the cylinder cutter that also will repeat automatically to demonstrate is adjusted 200mm downwards, so, coal-winning machine will continue the cutting exploitation in the position that does not have the coal seam, as seen, hilted broadsword memory coal cutting method can be amplified the error effect of demonstration cutter, has seriously influenced the lasting exploitation in coal seam.
Summary of the invention
At the problem that prior art exists, the purpose of this invention is to provide a kind of many demonstration cutter memory coal cutting methods, this method can reduce to remember the error that the demonstration cutter is introduced in the coal cutting process, improves the coal cutting effect.
Technical purpose of the present invention is achieved through the following technical solutions:
A kind of many demonstration cutter memory coal cutting methods comprise the steps:
Step is 1.: coal-winning machine carries out the i demonstration coal that lancinates to coal-face, described i=1, and 2 ... m, in the coal process was lancinated in the i demonstration, described coal-winning machine was adjusted cutting position and cut direction according to the position of the top and bottom of coal-face;
Step is 2.: if the coal cutting track of coal-winning machine does not touch top or the end of coal-face, then coal-winning machine obtains the lancinate track of coal of i demonstration, if the coal cutting track of coal-winning machine touches top or the end of coal-face, then repeating step 1.;
Step is 3.: repeating step 1. with step 2., obtain the lancinate track of coal of coal-winning machine the i+1～n demonstration, described n〉m;
Step is 4.: described coal-winning machine is a memory coal cutting circulation with the lancinate track of coal of the i～n demonstration, according to described memory coal cutting circulation to the coal-face coal cutting that circulates automatically.
Further, the i of described coal-winning machine～n demonstration is lancinated in coal and the automatic circulation coal cutting process, and the coal thickness that whenever lancinates is t.
Further, before coal-winning machine carried out coal cutting to coal-face, scraper plate drove described coal-winning machine towards coal-face direction displacement t.
Further, the coal thickness t of whenever lancinating is 0.8m.
Further, step 3. in, described n=3～5.
Further, step 3. in, described n=3.
Further, step 4. in, described coal-winning machine is 10m/min～12m/min in the travel speed of circulation in the automatic coal cutting.
Further, described coal-winning machine is from the feed of cutting sth. askew of an end of coal-face.
The present invention remembers coal cutting by adopting many demonstration cuttves, has reduced the error of single demonstration cutter effectively and has given the memory influence that coal cutting brings, and has reduced the tapping of coal-face top bed rock stone, and has improved the coal cutting effect, has improved the stability of coal cutting.
Description of drawings
Fig. 1 is the flow chart of a kind of preferred many demonstration cutter memory coal cutting methods of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, a preferred embodiment of the present invention is described in detail.
As shown in Figure 1, the invention provides a kind of many demonstration cutter memory coal cutting methods, this method comprises the steps:
Step is 1.: coal-winning machine carries out the i demonstration coal that lancinates to coal-face, described i=1, and 2 ... m, in the coal process was lancinated in the i demonstration, described coal-winning machine was adjusted cutting position and cut direction according to the position of the top and bottom of coal-face;
Step is 2.: if the coal cutting track of coal-winning machine does not touch top or the end of coal-face, then coal-winning machine obtains the lancinate track of coal of i demonstration, if the coal cutting track of coal-winning machine touches top or the end of coal-face, then repeating step 1.;
Coal-winning machine is walked from a termination of coal-face, and coal mining machine roller rotates coal cutting the process of another termination, during the coal-winning machine coal cutting according to the position needs of the top and bottom of coal-face top or the end of up-down adjustment cylinder to guarantee not cut coal-face constantly, the running track that forms coal-winning machine coal cutting while walking thus is the coal cutting track, the coal cutting track is actually the cylinder of coal-winning machine when the work plane diverse location that coal-winning machine writes down with respect to the height of coal-winning machine, it relates generally to two parameters, the one, coal-winning machine is in position and the direction of work plane, the 2nd, coal-winning machine when the coal cutting of relevant position the coal cutting cylinder with respect to the height of coal-winning machine.
Step is 3.: repeating step 1. with step 2., obtain the lancinate track of coal of coal-winning machine the i+1～n demonstration, described n〉m;
Step is 4.: described coal-winning machine is a memory coal cutting circulation with the lancinate track of coal of the i～n demonstration, according to described memory coal cutting circulation to the coal-face coal cutting that circulates automatically.
The present invention is by the coal cutting track of memory the i～n demonstration cutter, coal-winning machine is monitored each knife roller position, the roller height parameter of memory coal machine arbitrary position correspondence in work plane, thereby when circulating coal cutting automatically, coal-winning machine can be adjusted roller height by memory based cylinder track automatically, realize automatic coal cutting, in addition, the variation that the present invention can also preferably arrange the work plane regularity by parameter compensates.
As a preferred embodiment of the present invention, above-mentioned steps 3. in, n=3～5, in order to save the cost of manually-operated demonstration cutter, the n of present embodiment is preferably 3.For example, the coal-winning machine operating personnel utilize coal-winning machine to carry out the 3 cuttves demonstrations coal that lancinates, 3 cuttves demonstrations is lancinated and the coal cutting track is carried out manual intervention in the coal process, constantly adjusts the height of cylinder and angle so that the coal cutting track does not touch the top and bottom of coal-face, namely obtains the 3 coal tracks that lancinate; Start the automatic coal cutting program of coal-winning machine then, coal-winning machine is a memory coal cutting circulation with this 3 coal track that lancinates successively, and according to such memory coal cutting circulation to the coal-face coal cutting that circulates automatically, until the exploitation of finishing this work plane.Coal-winning machine of the present invention forms the coal cutting geometric locus that continuous dipping and heaving changes in the process of each cutter coal of cutting, and the curve of each cutter coal is all different, demonstration cutter memory coal cutting comes down to revise the lancinate fluctuating curve of the coal-winning machine fuselage in the coal process of coal-winning machine demonstration, when remembering coal cutting, cylinder is revised according to the demonstration coal track that lancinates, lower part of the body fluctuating curve and the demonstration coal geometric locus that lancinates is different on the coal-winning machine machine, the demonstration cutter is more many, different fair curves is just more many, and these fair curves are superimposed, will form a fair curve consistent with seat earth on the whole, thereby guarantee overall coal cutting effect.Therefore, according to actual needs, memory coal cutting of the present invention circulation can comprise the lancinate track of coal of more demonstration, the demonstration cutter that described memory coal cutting circulation comprises is more many, the stability of coal cutting general effect is more good, and more demonstration cutter can reduce the tapping work plane top rock amount at the end as much as possible, improves coal mining efficient.
As a preferred embodiment of the present invention, the i of coal-winning machine of the present invention～n demonstration is lancinated in coal and the automatic circulation coal cutting process, whenever the coal thickness that lancinates is t, for the cylinder that makes coal-winning machine can successfully further cut the coal seam of work plane, before coal-face carried out coal cutting, scraper plate drives described coal-winning machine also correspondingly towards coal-face direction displacement t, and preferably, the coal thickness t of whenever lancinating is 0.8m.Certainly, above-mentioned coal-winning machine coal cutting thickness is a preferred embodiment of the present invention, and the present invention can also reach specification of equipment according to actual needs and select suitable speed and thickness, repeats no more herein.
Consider the hardness in coal seam, in order to guarantee steadily carrying out of coal body cutting, step 4. described in coal-winning machine be preferably 10m/min～12m/min in the travel speed of circulation in the automatic coal cutting, when travel speed during greater than 12m/min, can cause support to be tried to stop people from fighting each other not catching up with or try to stop people from fighting each other not in place, and the monitoring remote video personnel control is not in place, and travel speed is during less than 10m/min, and the efficient that can cause mining reduces.Certainly, above-mentioned coal-winning machine travel speed is a preferred embodiment of the present invention, and the present invention can also reach specification of equipment according to actual needs and select suitable speed and thickness, repeats no more herein.
In the memory coal cutting process, the cylinder of coal-winning machine of the present invention is preferably from the feed of cutting sth. askew of an end of coal-face, activate automatic coal cutting function then, automatically need in the work plane parameter, import before the coal cutting: work plane zero point, face length, the location of going slowly, maximal rate and coal-winning machine current location; Import in automatic parameter: maximum mining height, maximum planted agent amount, minimum planted agent amount, mining height restriction and planted agent measure the restriction location that do not play a role; Can also select additional parameter, correction, wait cylinder, mining height and planted agent to measure limits value etc., can start automation coal cutting function after finishing setting, coal-winning machine is according to the demonstration stored cylinder position data coal cutting that circulates automatically of lancinating in the coal process.The face length of for example working is the coal seam of 300m, and the feed section of wherein cutting sth. askew is 30m, coal seam mining height 5m, and the coal thickness that whenever lancinates is 0.8m, and then the every cutter coal of coal-winning machine coal cutting volume is 300m * 5m * 0.8m, and wherein, the coal cutting volume is 270m * 5m * 0.8m automatically.
When single demonstration cutter of prior art is remembered coal cutting, the memory coal cutting can only be remembered reluctantly and cuts a cutter coal, the coal that lancinates of just must demonstrating again, cause ature of coal to descend otherwise coal-winning machine will seriously cut top or the end and cause the roof and floor injustice, finally cause automatic memory coal cutting to proceed again, and adopt many demonstration cutter memory coal cutting methods of the present invention can guarantee that coal-winning machine takes to remember the automatic coal cutting that circulates of coal cutting mode all the time.
Above-described embodiment is only for the usefulness that the present invention is described; and be not to be limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also should belong to category of the present invention, and scope of patent protection of the present invention should be limited by each claim.
Claims (8)
1. the cutter of demonstration more than kind memory coal cutting method is characterized in that this method comprises the steps:
Step is 1.: coal-winning machine carries out the i demonstration coal that lancinates to coal-face, described i=1, and 2 ... m, in the coal process was lancinated in the i demonstration, described coal-winning machine was adjusted cutting position and cut direction according to the position of the top and bottom of coal-face;
Step is 2.: if the coal cutting track of coal-winning machine does not touch top or the end of coal-face, then coal-winning machine obtains the lancinate track of coal of i demonstration, if the coal cutting track of coal-winning machine touches top or the end of coal-face, then repeating step 1.;
Step is 3.: repeating step 1. with step 2., obtain the lancinate track of coal of coal-winning machine the i+1～n demonstration, described n〉m;
Step is 4.: described coal-winning machine is a memory coal cutting circulation with the lancinate track of coal of the i～n demonstration, according to described memory coal cutting circulation to the coal-face coal cutting that circulates automatically.
2. many demonstration cutter memory coal cutting methods according to claim 1 is characterized in that, the i of described coal-winning machine～n demonstration is lancinated in coal and the automatic circulation coal cutting process, and the coal thickness that whenever lancinates is t.
3. many demonstration cutter memory coal cutting methods according to claim 2 is characterized in that before described coal-winning machine carried out coal cutting to coal-face, scraper plate drove described coal-winning machine towards coal-face direction displacement t.
4. many demonstration cutter memory coal cutting methods according to claim 2 is characterized in that the coal thickness t of whenever lancinating is 0.8m.
5. many demonstration cutter memory coal cutting methods according to claim 1 is characterized in that, step 3. in, described n=3～5.
6. many demonstration cutter memory coal cutting methods according to claim 5 is characterized in that, step 3. in, described n=3.
7. many demonstration cutter memory coal cutting methods according to claim 1 is characterized in that, step 4. in, the travel speed of described coal-winning machine in the automatic coal cutting of circulation is 10m/min～12m/min.
8. many demonstration cutter memory coal cutting methods according to claim 1 is characterized in that, described coal-winning machine is from the feed of cutting sth. askew of an end of coal-face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310128882.5A CN103233731B (en) | 2013-04-15 | 2013-04-15 | Coal cutting method with multiple demonstration knifes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310128882.5A CN103233731B (en) | 2013-04-15 | 2013-04-15 | Coal cutting method with multiple demonstration knifes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103233731A true CN103233731A (en) | 2013-08-07 |
| CN103233731B CN103233731B (en) | 2015-04-22 |
Family
ID=48881794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310128882.5A Active CN103233731B (en) | 2013-04-15 | 2013-04-15 | Coal cutting method with multiple demonstration knifes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103233731B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108491360A (en) * | 2018-02-26 | 2018-09-04 | 北京天地玛珂电液控制系统有限公司 | A kind of computational methods of coal mining output |
| CN111810149A (en) * | 2020-07-13 | 2020-10-23 | 神华神东煤炭集团有限责任公司 | Lifting and lying control method for ultra-large mining height fully-mechanized coal mining face, storage medium and electronic equipment |
| CN112943241A (en) * | 2021-01-25 | 2021-06-11 | 三一重型装备有限公司 | Automatic cutting control method, device and system for coal mining machine and storage medium |
| CN113803069A (en) * | 2021-09-26 | 2021-12-17 | 中国矿业大学 | Teaching-memory-free cutting system and method for intelligent fully-mechanized caving face coal mining machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB845322A (en) * | 1956-11-28 | 1960-08-17 | Eickhoff Geb | Improvements in machines for cutting coal and like minerals |
| DE2622218A1 (en) * | 1976-05-19 | 1977-12-01 | Eickhoff Geb | METHOD AND DEVICE FOR SECURING HARVESTING MACHINES USED IN INCLINED OR STEEP FLOEZEN |
| AU2314801A (en) * | 2000-02-20 | 2001-08-23 | Yankuang Group Corporation | A method for increasing producing capacity of a full-mechanized top-coal caving face |
| CN102337891A (en) * | 2011-09-14 | 2012-02-01 | 天地科技股份有限公司 | Thin coal seam unmanned automated mining mode |
| CN202578697U (en) * | 2012-04-18 | 2012-12-05 | 中国煤矿机械装备有限责任公司 | High-power automatic coal cutter with memory cutting function for thin coal layers |
-
2013
- 2013-04-15 CN CN201310128882.5A patent/CN103233731B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB845322A (en) * | 1956-11-28 | 1960-08-17 | Eickhoff Geb | Improvements in machines for cutting coal and like minerals |
| DE2622218A1 (en) * | 1976-05-19 | 1977-12-01 | Eickhoff Geb | METHOD AND DEVICE FOR SECURING HARVESTING MACHINES USED IN INCLINED OR STEEP FLOEZEN |
| AU2314801A (en) * | 2000-02-20 | 2001-08-23 | Yankuang Group Corporation | A method for increasing producing capacity of a full-mechanized top-coal caving face |
| CN102337891A (en) * | 2011-09-14 | 2012-02-01 | 天地科技股份有限公司 | Thin coal seam unmanned automated mining mode |
| CN202578697U (en) * | 2012-04-18 | 2012-12-05 | 中国煤矿机械装备有限责任公司 | High-power automatic coal cutter with memory cutting function for thin coal layers |
Non-Patent Citations (6)
| Title |
|---|
| 刘春生: "滚筒式采煤机记忆截割的数学原理", 《黑龙江科技学院学报》 * |
| 刘春生等: "基于单示范刀采煤机记忆截割的数学模型", 《煤炭科学技术》 * |
| 刘阔等: "采煤机记忆截割的轨迹拟合", 《煤矿机电》 * |
| 杨景才等: "神东矿区1.5～2.0m煤层自动化开采关键技术研究与实践", 《神华科技》 * |
| 樊启高等: "一种采用灰色马尔科夫组合模型的采煤机记忆截割算法", 《中南大学学报(自然科学版)》 * |
| 索智文: "Faceboss采煤机记忆割煤的应用实践", 《煤矿开采》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108491360A (en) * | 2018-02-26 | 2018-09-04 | 北京天地玛珂电液控制系统有限公司 | A kind of computational methods of coal mining output |
| CN108491360B (en) * | 2018-02-26 | 2022-04-01 | 北京天玛智控科技股份有限公司 | Coal mining amount calculation method |
| CN111810149A (en) * | 2020-07-13 | 2020-10-23 | 神华神东煤炭集团有限责任公司 | Lifting and lying control method for ultra-large mining height fully-mechanized coal mining face, storage medium and electronic equipment |
| CN111810149B (en) * | 2020-07-13 | 2022-05-20 | 神华神东煤炭集团有限责任公司 | Lifting and lying control method for fully mechanized mining face with super-large mining height, storage medium and electronic equipment |
| CN112943241A (en) * | 2021-01-25 | 2021-06-11 | 三一重型装备有限公司 | Automatic cutting control method, device and system for coal mining machine and storage medium |
| CN112943241B (en) * | 2021-01-25 | 2024-02-27 | 三一重型装备有限公司 | Automatic cutting control method, device and system for coal mining machine and storage medium |
| CN113803069A (en) * | 2021-09-26 | 2021-12-17 | 中国矿业大学 | Teaching-memory-free cutting system and method for intelligent fully-mechanized caving face coal mining machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103233731B (en) | 2015-04-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109386291B (en) | Method and device for planning cutting path of heading machine and cutting control system of heading machine | |
| CN103233731B (en) | Coal cutting method with multiple demonstration knifes | |
| US6857705B2 (en) | Mining machine and method | |
| CN106089201B (en) | A kind of cut paths planning method for unmanned coal-face | |
| CN109469484B (en) | Automatic coal mining method based on upper computer planning | |
| CN101952547B (en) | Method for automatically creating a defined face opening in longwall coal mining operations | |
| RU2681007C1 (en) | Method of controlling the position of the cutting machine in a long face on the basis of a geological information system of a coal seam | |
| CN110691889B (en) | Adaptive pitch control in longwall mining systems | |
| CN103216233B (en) | Method for identifying coal-rock interface of thin coal seam and automatically heightening roller | |
| CN113513315B (en) | Cutting visualization and adjusting method for top and bottom plates of fully mechanized mining face | |
| CN105952377B (en) | Underground coal mine directional drilling method for controlling trajectory | |
| AU2008351278A1 (en) | Method for automatically creating a defined face opening in plow operations in coal mining | |
| CN111485880A (en) | Method and device for generating intelligent mining prediction cutting line of coal mine stope face | |
| CN113128078B (en) | Self-adaptive cutting path planning method for rear drum of coal mining machine of fully mechanized mining face | |
| CN106401585A (en) | Memory coal cutting control method based on cooperative control over coal cutter and supports | |
| CN109209504B (en) | Programmable automatic machine following method for upper computer | |
| CN113803069B (en) | Teaching-memory-free cutting system and method for intelligent fully-mechanized caving face coal mining machine | |
| CN104763694A (en) | Sectional pressure set value optimization method of hydraulic propelling system of heading machine | |
| US9103209B2 (en) | System for controlling speed of travel in a longwall shearer | |
| CN105201507A (en) | Mining system and mining method for high-dipping super-high seam shortwall working face | |
| CN105551074A (en) | Automatic updating method for three-dimensional model of unmanned mining work face | |
| RU2779708C1 (en) | Mining machine for extracting material from a deposit and a method for controlling such a machine | |
| CN118114844B (en) | Cutting track planning method and device for coal mining machine | |
| Holm et al. | Concept of shield-data-based horizon control for longwall coal mining automation | |
| CN110847904A (en) | Automatic coal cutting method based on discrete control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhou Chengjun Inventor after: Xu Huijun Inventor before: Zhou Chengjun |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: ZHOU CHENGJUN TO: ZHOU CHENGJUN XU HUIJUN |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |