CN111806905A - Coal bunker capable of preventing high-moisture coal from being bonded - Google Patents
Coal bunker capable of preventing high-moisture coal from being bonded Download PDFInfo
- Publication number
- CN111806905A CN111806905A CN202010566718.2A CN202010566718A CN111806905A CN 111806905 A CN111806905 A CN 111806905A CN 202010566718 A CN202010566718 A CN 202010566718A CN 111806905 A CN111806905 A CN 111806905A
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- coal bunker
- coal
- bunker body
- wall
- stirring
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- 239000003245 coal Substances 0.000 title claims abstract description 184
- 238000003756 stirring Methods 0.000 claims abstract description 30
- 239000004698 Polyethylene Substances 0.000 claims description 14
- -1 polyethylene Polymers 0.000 claims description 14
- 229920000573 polyethylene Polymers 0.000 claims description 14
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D88/00—Large containers
- B65D88/54—Large containers characterised by means facilitating filling or emptying
- B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The coal bunker comprises a coal bunker body, wherein the coal bunker body is a quadrangular frustum pyramid with a wide upper part and a narrow lower part, the upper end and the lower end of the coal bunker body are both in an open structure, one surface of the coal bunker body is an inclined surface, the other three surfaces of the coal bunker body are vertical surfaces, loose pieces sliding along the inner wall are arranged on the inclined surface of the coal bunker body and the vertical surface opposite to the inclined surface, a stirring piece is rotatably arranged on the inner wall of the coal bunker body, a pull rod extending outwards through the coal bunker body is arranged on the stirring piece, a driving motor is arranged on the outer wall of the coal bunker body, and an output shaft of the driving motor is connected with one end, far away from the stirring piece, of the pull rod through a shaking connecting rod. Vertical face can be piled up this internal coal of coal bunker to the inclined plane, reduces the attachable face of coal, and then stirs loose piece by stirring the piece to carrying out loosely to the coal of gluing on coal bunker body inner wall, recovering the mobility of coal, the boiler operation that prevents that coal jam from causing appears stirring.
Description
Technical Field
The invention belongs to the field of power generation equipment, and particularly relates to a coal bunker for preventing high-moisture coal from being bonded.
Background
The coal moisture content has a large influence on the coal flowability, and within a certain range, the higher the coal moisture content is, the higher the adhesion degree is, and the poorer the flowability is. Circulating fluidized bed boilers generally require the moisture of coal as fired to be controlled between 6% and 8%, and when the moisture of the coal exceeds 8%, the adhesiveness is greatly increased; when the coal moisture content exceeds 10%, the fluidity of the coal is lowered and the adhesion is increased, and the coal is easily adhered and adsorbed on the wall of the coal bunker to be accumulated. Thermal power generation with coal mostly takes washing and mixing coal as main material, the moisture of the coal is about 14%, the coal is mixed and burned with other coal after being mixed and burned in a boiler, the moisture of the mixed coal is about 10%, and the moisture of coal as fired is about 12% under the influence of weather such as rain, snow and the like, so that frequent coal blockage of a coal bunker is caused.
Coal bin coal blockage is a problem frequently encountered in the operation process of a boiler, and if the coal bin coal blockage is light, the coal feeding quantity of the boiler is reduced, so that the load is suddenly reduced, and the environmental protection NOx index exceeds the standard; severe causes shifting of boiler load and shutdown of coal feeder, and further causes boiler shutdown and unit shutdown. The boiler is shut down when the pressure is cut off, the external steam supply is interrupted, huge economic loss is caused to industrial steam customers, and the heating season can also have large-range influence on heating users.
The wall of the coal bunker of the boiler is stuck with coal, so that the effective volume of the coal bunker is reduced; the frequent coal blockage and coal shed increase the labor intensity of operators and correspondingly increase the equipment failure rate, and seriously affect the equipment maintenance and overhaul.
Disclosure of Invention
The invention provides a coal bunker for preventing high-moisture coal from being bonded, aiming at solving the problem that coal inside the coal bunker is frequently bonded and blocked in the thermal power generation process.
The invention is realized by the following technical scheme.
The utility model provides a coal bunker that prevents high moisture coal from cohering, includes the coal bunker body, the coal bunker body is narrow four pyramid platforms down about wide, both ends are open structure about the coal bunker body, wherein the one side of coal bunker body is the inclined plane, and other trilaterals are vertical face, be equipped with on the inclined plane of coal bunker body and the vertical face relative with the inclined plane along the gliding loose piece of inner wall, it dials the piece to rotate on the coal bunker body inner wall, dial and be equipped with on the piece and pass the pull rod of outside extension of coal bunker body, be equipped with driving motor on the coal bunker body outer wall, driving motor's output shaft through wave the connecting rod with the pull rod is kept away from the one end of dialling the piece and meets. An inclined plane and three vertical face can effectively reduce the adhesion surface of coal whereabouts in-process on the inner wall, and driving motor drives through the pull rod and dials the piece, and then dials the piece and stir relative loose piece in turn to carrying out the porosity to the coal of gluing on the coal bunker body inner wall, recovering the mobility of coal, prevent that the boiler operation that the coal jam caused from appearing stirring.
The invention further improves that the loosening element is a loosening frame hung on the inner wall of the coal bunker body. Through the slip of not hard up frame on the coal bunker body inner wall, in time loose the coal of whereabouts in-process, prevent to appear piling up on the inner wall.
The invention is further improved in that the side edges of the loosening frame are respectively provided with a loosening support rod which horizontally extends along the inner wall adjacent to the inclined surface of the coal bunker body. The effective loosening range of the accumulated coal on other inner wall surfaces is increased by loosening the support rod.
In addition, the invention is further improved in that transverse reinforcing support rods are arranged in the loosening frame at intervals from top to bottom. Increase the structural strength of not hard up frame through strengthening the bracing piece to increase and carry out the effective area of clearance to coal on the inner wall.
The invention is further improved, and the loose supporting rod is provided with spaced convex pieces. The loosening effect of the loose supporting rod on coal is increased through the protruding part.
In a further development of the invention, the reinforcing support bar is provided with spaced projections. The loosening effect of the loose supporting rod on coal is increased through the protruding part.
The invention is further improved in that the poking piece is a rectangular poking frame, the poking frame is rotatably arranged on the coal bunker body through a supporting rotating shaft, and the supporting rotating shaft is symmetrically arranged on the inner wall adjacent to the inclined surface of the coal bunker body. The poking frame is turned over and poked along the supporting rotating shaft so as to push the two opposite loosening frames to move along the coal bunker body.
The invention is further improved in that an eccentric wheel is arranged on the upper part of the inclined outer wall of the coal bunker body, and a rotating shaft of the eccentric wheel is connected with an output shaft of the driving motor through a transmission piece. The rotation of eccentric wheel forms vibrations to the inclined plane of coal bunker body and beats to increase the loose effect of coal on the inner wall.
The invention is further improved in that the inner wall of the coal bunker body is provided with a spliced polyethylene plate. The polyethylene plate is used as the lining plate of the inner wall of the coal bunker body, so that the friction coefficient between the inner wall and coal is reduced, and the flowability of the coal in the coal bunker body is improved.
According to the technical scheme, the invention has the beneficial effects that: vertical face can be piled up this internal coal of coal bunker to the inclined plane, reduces the attachable face of coal, and then stirs loose piece by stirring the piece to carrying out loosely to the coal of gluing on coal bunker body inner wall, recovering the mobility of coal, the boiler operation that prevents that coal jam from causing appears stirring.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Figure 2 is a schematic view of a porous member according to an embodiment of the present invention.
Figure 3 is a schematic view of a polyethylene sheet according to an embodiment of the present invention.
In the drawings: 1. the coal bunker comprises a coal bunker body, 11, a slotted hole, 2, a loosening piece, 21, a reinforcing support rod, 22, a loosening support rod, 23, a protrusion piece, 3, a driving motor, 31, a shaking connecting rod, 4, an eccentric wheel, 5, a stirring piece, 51, a pull rod, 52, a support shaft, 6, a polyethylene plate, 61 and a mounting hole.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
As shown in the attached drawings, the coal bunker for preventing high-moisture coal from being bonded comprises a coal bunker body 1, wherein the coal bunker body 1 is a quadrangular frustum pyramid with a wide upper part and a narrow lower part, and both the upper end and the lower end of the coal bunker body 1 are of an open structure. The storage capacity of coal in the coal bunker body 1 is increased. One side of the coal bunker body 1 is an inclined plane, and the other three sides are vertical surfaces. The vertical surface can pile up the coal in the coal bunker body 1 to the inclined surface, reduces the coal can adhere to the face. The coal bunker is characterized in that a loosening piece 2 sliding along the inner wall is arranged on the inclined surface of the coal bunker body 1 and the vertical surface opposite to the inclined surface, a stirring piece 5 is arranged on the inner wall of the coal bunker body 1 in a rotating mode, a pull rod 51 penetrating through the coal bunker body 1 and extending outwards is arranged on the stirring piece 5, a driving motor 3 is arranged on the outer wall of the coal bunker body 1, and an output shaft of the driving motor 3 is connected with one end, far away from the stirring piece 5, of the pull rod 51 through a shaking connecting rod 31. Driving motor 2 rotates into pull rod 51's upper and lower straight line work through rocking connecting rod 31 with the rotary motion with the output shaft, and then dials 5 pieces of stirring and stir relative loose 2 in turn to carrying out the looseness to the coal of gluing on coal bunker body 1 inner wall, recovering the mobility of coal, preventing that the boiler operation that the coal jam caused from stirring appears.
The inclined plane of the lower part of the coal bunker body 1 is provided with a vertical slotted hole 11, and the pull rod 51 passes through the slotted hole 11 and is connected with the output shaft of the driving motor 3 through the swinging connecting rod 31. The driving motor 3 drives the pull rod 51 to move up and down along the slot 11 by swinging the connecting rod 31 to do work, and further drives the shifting piece 5 to move in the coal bunker body 1.
The loosening element 2 is a loosening frame hung on the inner wall of the coal bunker body 1. That is to say, loose 2 through the pendant with loose 2 hang on 1 inner walls of coal bunker body, loose 2 bearings of piece through the pendant, through not hard up the slip of frame on 1 inner walls of coal bunker body, in time loose the coal of whereabouts in-process, prevent to appear piling up on the inner wall.
And the side edges of the loosening frame are respectively provided with loosening support rods 22 which horizontally extend along the inner wall adjacent to the inclined surface of the coal bunker body 1. The effective loosening range of the accumulated coal on other inner wall surfaces is increased by loosening the support rod 22.
And transverse reinforcing support rods 21 are arranged in the loosening frame at intervals from top to bottom. The structural strength of the frame is increased through the reinforcing support rods 21, and the effective area for cleaning coal on the inner wall is increased.
The loose supporting rod 22 is provided with spaced convex parts 23. The loosening effect of the loose support rod 22 on the coal is increased by the protruding piece 23.
The reinforcing support bar 21 is provided with spaced protrusions 23. The loosening effect of the loose support rod 22 on the coal is increased by the protruding piece 23.
The stirring piece 5 is a rectangular stirring frame, the stirring frame is rotatably arranged on the coal bunker body 1 through a supporting rotating shaft, and the supporting rotating shaft is symmetrically arranged on the inner wall adjacent to the inclined surface of the coal bunker body 1. The poking frame is turned over and poked along the supporting rotating shaft so as to push the two opposite loosening frames to move along the coal bunker body 1.
An eccentric wheel 4 is arranged on the upper portion of the inclined outer wall of the coal bunker body 1, and a rotating shaft of the eccentric wheel 4 is connected with an output shaft of the driving motor 3 through a transmission piece. The rotation of eccentric wheel 4 forms vibrations to the inclined plane of coal bunker body 1 and beats to increase the loose effect of coal on the inner wall.
The inner wall of the coal bunker body 1 is provided with a spliced polyethylene plate 6. The polyethylene plate 6 is used as a lining plate of the inner wall of the coal bunker body 1, so that the friction coefficient between the inner wall and coal is reduced, and the flowability of the coal in the coal bunker body 1 is improved.
The polyethylene plate 6 is provided with mounting holes 61 arranged in a matrix, and the mounting holes 61 are internally provided with the protruding pieces 23. The protruding piece 23 is installed in the installation hole 61 according to the construction condition, and the effective area of the coal attached to the polyethylene plate 6 is reduced.
The protruding member 23 is conical. The conical protruding piece 23 punctures the coal hardened on the inner wall of the coal bunker body 1, so that the fluidity of the coal in the coal bunker body 1 is realized.
Internal threads are arranged in the mounting holes 61 on the polyethylene plates 6, and the polyethylene plates 6 are mounted on the inner wall of the coal bunker body 1 through the mounting holes 61. The plane of the conical protruding part 23 installed on the polyethylene plate 6 is provided with a stud matched with the installation hole 61, so that flexible installation on the polyethylene plate 6 is increased. The conical protrusions 23 attached to the polyethylene plate 6 are attached by selecting the attachment holes 61 that avoid the movement paths of the loosening frame, the reinforcing support rod 21, and the loosening support rod 22 according to the site operation.
According to the coal bunker capable of preventing high-moisture coal from being bonded, the vertical surface can be used for accumulating coal in the coal bunker body to the inclined surface, the attachable surface of the coal is reduced, and the stirring piece is used for stirring the loosening piece so as to loosen the coal bonded on the inner wall of the coal bunker body, recover the fluidity of the coal and prevent stirring of the boiler caused by coal blockage during operation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The terms "upper", "lower", "outside", "inside" and the like in the description and claims of the present invention and the above drawings are used for distinguishing relative positions if any, and are not necessarily given qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A coal bunker for preventing high-moisture coal from being bonded, which is characterized by comprising a coal bunker body (1), the coal bunker body (1) is a quadrangular frustum with a wide upper part and a narrow lower part, the upper end and the lower end of the coal bunker body (1) are both in an open structure, one surface of the coal bunker body (1) is an inclined surface, the other three surfaces are vertical surfaces, the inclined surface of the coal bunker body (1) and the vertical surface opposite to the inclined surface are provided with loosening pieces (2) sliding along the inner wall, a stirring piece (5) is rotatably arranged on the inner wall of the coal bunker body (1), a pull rod (51) which penetrates through the coal bunker body (1) and extends outwards is arranged on the stirring piece (5), the coal bunker is characterized in that a driving motor (3) is arranged on the outer wall of the coal bunker body (1), and an output shaft of the driving motor (3) is connected with one end, far away from the stirring piece (5), of the pull rod (51) through a rocking connecting rod (31).
2. The coal bunker of claim 1, wherein the loosening element (2) is a loosening frame hung on the inner wall of the coal bunker body (1).
3. The coal bunker of claim 2, wherein the side edges of the loose frame are provided with loose support rods (22) horizontally extending along the inner walls adjacent to the inclined surface of the coal bunker body (1).
4. The coal bunker of claim 2, wherein the loosening frame is provided with transverse reinforcing support rods (21) at intervals from top to bottom.
5. A coal bunker for preventing high-moisture coal from bonding as claimed in claim 3, wherein the loose support rods (22) are provided with spaced projections (23).
6. A coal bunker for preventing high-moisture coal from bonding as claimed in claim 4, wherein the reinforcing support rods (21) are provided with spaced projections (23).
7. The coal bunker of claim 1, wherein the stirring member (5) is a rectangular stirring frame, the stirring frame is rotatably disposed on the coal bunker body (1) through a supporting rotating shaft, and the supporting rotating shaft is symmetrically disposed on the inner wall adjacent to the inclined surface of the coal bunker body (1).
8. The coal bunker for preventing the caking of the high-moisture coal as claimed in claim 1, wherein an eccentric wheel (4) is arranged on the upper part of the inclined outer wall of the coal bunker body (1), and the rotating shaft of the eccentric wheel (4) is connected with the output shaft of the driving motor (3) through a transmission part.
9. The coal bunker of claim 1, wherein the spliced polyethylene plates (6) are installed on the inner wall of the coal bunker body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010566718.2A CN111806905B (en) | 2020-06-19 | 2020-06-19 | Coal bunker capable of preventing high-moisture coal from being bonded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010566718.2A CN111806905B (en) | 2020-06-19 | 2020-06-19 | Coal bunker capable of preventing high-moisture coal from being bonded |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111806905A true CN111806905A (en) | 2020-10-23 |
| CN111806905B CN111806905B (en) | 2021-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010566718.2A Expired - Fee Related CN111806905B (en) | 2020-06-19 | 2020-06-19 | Coal bunker capable of preventing high-moisture coal from being bonded |
Country Status (1)
| Country | Link |
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| CN (1) | CN111806905B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201442722U (en) * | 2009-06-22 | 2010-04-28 | 山东兖煤凯达环保机械有限公司 | Bunker coal feeding pushing device |
| CN202098736U (en) * | 2011-05-26 | 2012-01-04 | 煤炭工业济南设计研究院有限公司 | Ring type device capable of loosing coal bunker |
| CN202944737U (en) * | 2012-12-05 | 2013-05-22 | 南乐县永昌机械制造有限公司 | Loosening machine for blockage cleaning engineering of storage bin |
| CN203473634U (en) * | 2013-08-07 | 2014-03-12 | 西安越达环保科技有限公司 | Stock bin dredging machine |
| CN108557291A (en) * | 2018-05-03 | 2018-09-21 | 安徽理工大学 | One kind having automatic loose function coal bunker |
| CN208813906U (en) * | 2018-08-15 | 2019-05-03 | 浙江颜雪化妆品有限公司 | A kind of eyebrow pencil vibration anti-blocking lower hopper |
| CN210392243U (en) * | 2019-06-26 | 2020-04-24 | 江苏奥喜埃化工有限公司 | Coal bunker loosening machine |
| CN111115031A (en) * | 2019-12-25 | 2020-05-08 | 淄博矿业集团有限责任公司岱庄煤矿 | Coal mine main hoisting unloading buffering coal bunker anti-blocking device |
| RU2721639C1 (en) * | 2019-11-21 | 2020-05-21 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Bulk material hopper |
| CN210593456U (en) * | 2019-06-27 | 2020-05-22 | 湖北谷城泰隆水泥有限公司 | Prevent raw coal unloader of wall |
-
2020
- 2020-06-19 CN CN202010566718.2A patent/CN111806905B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201442722U (en) * | 2009-06-22 | 2010-04-28 | 山东兖煤凯达环保机械有限公司 | Bunker coal feeding pushing device |
| CN202098736U (en) * | 2011-05-26 | 2012-01-04 | 煤炭工业济南设计研究院有限公司 | Ring type device capable of loosing coal bunker |
| CN202944737U (en) * | 2012-12-05 | 2013-05-22 | 南乐县永昌机械制造有限公司 | Loosening machine for blockage cleaning engineering of storage bin |
| CN203473634U (en) * | 2013-08-07 | 2014-03-12 | 西安越达环保科技有限公司 | Stock bin dredging machine |
| CN108557291A (en) * | 2018-05-03 | 2018-09-21 | 安徽理工大学 | One kind having automatic loose function coal bunker |
| CN208813906U (en) * | 2018-08-15 | 2019-05-03 | 浙江颜雪化妆品有限公司 | A kind of eyebrow pencil vibration anti-blocking lower hopper |
| CN210392243U (en) * | 2019-06-26 | 2020-04-24 | 江苏奥喜埃化工有限公司 | Coal bunker loosening machine |
| CN210593456U (en) * | 2019-06-27 | 2020-05-22 | 湖北谷城泰隆水泥有限公司 | Prevent raw coal unloader of wall |
| RU2721639C1 (en) * | 2019-11-21 | 2020-05-21 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Тульский государственный университет" (ТулГУ) | Bulk material hopper |
| CN111115031A (en) * | 2019-12-25 | 2020-05-08 | 淄博矿业集团有限责任公司岱庄煤矿 | Coal mine main hoisting unloading buffering coal bunker anti-blocking device |
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| Publication number | Publication date |
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| CN111806905B (en) | 2021-09-28 |
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| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Shuxin Inventor after: Wang Jian Inventor after: Zhang Yuliang Inventor after: Sun Zhiqiang Inventor after: Li Guangyu Inventor after: Chen Zhanguang Inventor after: Song Daohai Inventor before: Li Shuxin Inventor before: Wang Jian Inventor before: Zhang Yuliang Inventor before: Sun Zhiqiang Inventor before: Li Guangyu Inventor before: Chen Zhanguang |
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Granted publication date: 20210928 |