CN108708729B - A consolidate sealing device that is used for blasting in pit to mine mouth - Google Patents
A consolidate sealing device that is used for blasting in pit to mine mouth Download PDFInfo
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- CN108708729B CN108708729B CN201810458237.2A CN201810458237A CN108708729B CN 108708729 B CN108708729 B CN 108708729B CN 201810458237 A CN201810458237 A CN 201810458237A CN 108708729 B CN108708729 B CN 108708729B
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- connecting cylinder
- sealing
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- 238000007789 sealing Methods 0.000 title claims abstract description 56
- 238000005422 blasting Methods 0.000 title claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 69
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000004567 concrete Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000005065 mining Methods 0.000 description 11
- 230000002787 reinforcement Effects 0.000 description 10
- 230000006872 improvement Effects 0.000 description 7
- 239000003245 coal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D7/00—Shaft equipment, e.g. timbering within the shaft
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a reinforcing and sealing device for a mine port by blasting in a mine, which comprises: the well seat comprises an upper well seat and a lower well seat, the upper well seat is arranged above the lower well seat and is matched with the lower well seat, and the outer side wall of the upper well seat is provided with a sealing and reinforcing mechanism; the reinforcing and sealing device for the mine opening by the blasting in the mine further comprises a mine opening, wherein a supporting and reinforcing mechanism is arranged in the mine opening, and a well cover matched with the supporting and reinforcing mechanism is arranged on the supporting and reinforcing mechanism; the sealing reinforcing mechanism and the supporting reinforcing mechanism are used in an internal-external matching mode. On the premise of meeting the requirement of convenient use, the invention changes the traditional technical scheme, adopts a new reinforcing and sealing technology, greatly improves the reinforcing and sealing effect on the mine wellhead, has very good stability, avoids mine collapse caused by blasting, greatly improves the safety factor, protects the life safety of mine workers, has better safety use performance, and meets the actual use requirement.
Description
Technical Field
The invention particularly relates to a reinforcing and sealing device for a mine mouth in mine blasting, and belongs to the technical field of mine mouth reinforcing.
Background
In the mine mined under the ground, inclined shafts, vertical shafts, adit and the like in the underground development of the mine are also called as mines, the mine development has great and profound influence on the whole production and construction of metal mines or coal mining mines, and the method not only relates to the capital construction amount, initial investment and well construction speed of the mine, but also determines the production conditions and technical and economic indexes of the mine for a long time. Mine development is to dig a series of roadways from the ground to the underground and lead the roadways to a mining area. The main problems to be solved by mine development are as follows: the method comprises the steps of correctly dividing a well field, selecting a reasonable development mode, determining the production capacity of a mine, dividing mining levels according to elevations, selecting a proper ventilation mode, deploying mining areas, determining the mining sequence of the mining areas and the like. Mine exploitation is generally divided into adit exploitation, inclined shaft exploitation and vertical shaft exploitation in the form of a shaft, and the key to making good mine production is to adopt a reasonable mining method.
In actual mining, blasting is needed to be carried out on a mine so as to facilitate subsequent development work. The development of the mine can be divided into vertical shaft development, inclined shaft development, adit development and comprehensive development, a main shaft, a transportation lane and the like all need permanent support, and arch support, awning support, anchor rod support, anchor spraying support, anchor net spraying support, anchor cable support, metal arch support, stone support, reinforced concrete support and combination support among various supports can be adopted; the excavation working face needs temporary support, and the modes of hitting a point column, supporting a hydraulic support column, supporting a wood support column and the like are mainly adopted; the coal mining generally adopts retreating type coal mining, and the support is strengthened while the coal mining is carried out; the gob generally collapses either with filling or by itself.
At present, the reinforcement and sealing treatment of a wellhead is required in mine blasting engineering, the reinforcement and sealing are performed at an entrance, a box is reinforced and sealed in a multi-layer supporting mode in the prior art, the blasting engineering has large vibration amplitude and wide related and affected area, the reinforcement and sealing in the multi-layer supporting mode cannot achieve the preset reinforcement effect, the reinforcement and sealing effects are poor, the mine collapse and the surrounding environment are affected, and the life safety of mine workers is endangered in serious cases. Therefore, a new technical scheme needs to be designed, and the defects in the prior art can be comprehensively overcome.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the reinforcing and sealing device for the mine mouth in the mine well in the blasting process, the traditional technical scheme is changed on the premise of meeting the requirement of convenient use, the novel reinforcing and sealing technology is adopted, the reinforcing and sealing effect on the mine mouth is greatly improved, the stability is very good, the mine collapse event caused by the blasting is avoided, the safety coefficient is greatly improved, the life safety of mine workers is protected, the safety use performance is better, and the practical use requirement is met.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a reinforced seal for a mine borehole for blasting in a mine, comprising: the well seat comprises an upper well seat and a lower well seat, the upper well seat is arranged above the lower well seat and is matched with the lower well seat, and the outer side wall of the upper well seat is provided with a sealing and reinforcing mechanism;
the reinforcing and sealing device for the mine opening by the blasting in the mine further comprises a mine opening, wherein a supporting and reinforcing mechanism is arranged in the mine opening, and a well cover matched with the supporting and reinforcing mechanism is arranged on the supporting and reinforcing mechanism;
the sealing reinforcing mechanism and the supporting reinforcing mechanism are used in an internal-external matching mode.
As an improvement of the above technical scheme, the sealing and reinforcing mechanism includes a connecting cylinder, a connection interface matched with the upper well seat is processed on the connecting cylinder, bumps are arranged at two ends of the connecting cylinder, connecting plates matched with the connecting cylinder are arranged at two ends of the connecting cylinder, a sliding groove matched with the bumps for use is processed on the connecting plate, the sealing and reinforcing mechanism further includes a drill spindle penetrating through the connecting plate and the connecting cylinder, and a tightening device is arranged on the drill spindle.
As the improvement of above-mentioned technical scheme, support the strengthening mechanism and include connecting cylinder and lower connecting cylinder, go up the connecting cylinder with the connecting cylinder is for being linked together the setting down, go up the connecting cylinder with all be provided with the spread groove in the connecting cylinder down, all be provided with adjusting device on the spread groove, all be provided with the cooperation in the spread groove the connecting axle that adjusting device used, the connecting axle both ends all are provided with joint cutter, the last adjusting screw who is used for adjusting the connecting axle tightness that is provided with of adjusting device, the adjusting screw top is provided with handle portion, handle portion below is provided with the reinforcement nut who is used for the regulating action.
As an improvement of the technical scheme, the upper connecting cylinder and the lower connecting cylinder are detachably connected, and a detachably mounted connecting clamping block is arranged at the joint of the upper connecting cylinder and the lower connecting cylinder.
As an improvement of the above technical scheme, the top of the upper connecting cylinder is provided with a well lid, a threaded rod is arranged below the well lid, the upper part of the upper connecting cylinder is provided with a reinforcing part, and the reinforcing part is provided with a threaded hole matched with the threaded rod.
As an improvement of the technical scheme, the flat plate part of the upper well seat is paved with a reticular steel bar group, the lower well seat part is paved with an annular steel bar group, and the upper well seat and the lower well seat are both formed by pouring concrete.
As an improvement of the technical scheme, the upper well seat comprises an annular structure and a circular truncated cone-shaped structure, the lower well seat is of the annular structure, an inner hole of the upper well seat is two holes which are small in size and large in size, and the diameter of each small hole is smaller than that of the well cover.
As an improvement of the technical scheme, a sealing gasket is arranged between the sealing and reinforcing mechanism and the contact surface of the outer side wall of the upper well seat.
Compared with the prior art, the invention has the following implementation effects:
the reinforcing and sealing device for the mine mouth in the mine blasting changes the traditional technical scheme on the premise of meeting the requirement of convenient use, adopts a new reinforcing and sealing technology, and utilizes the effects that the sealing and reinforcing mechanism and the supporting and reinforcing mechanism are formed into internal and external complementation and are matched for use, so that the reinforcing and sealing effect on the mine mouth is greatly improved, the stability is very good, the mine collapse event caused by the blasting is avoided, the safety coefficient is greatly improved, the life safety of mine workers is protected, the reinforcing and sealing device has better safety use performance, and the actual use requirement is met.
Drawings
FIG. 1 is a schematic structural view of a reinforcing and sealing device for a mine hole in a mine shaft for blasting according to the invention;
FIG. 2 is a schematic structural view of a sealing and reinforcing mechanism in a reinforcing and sealing device for a mine port in a mine shaft by blasting according to the present invention;
fig. 3 is a schematic structural view of a supporting and reinforcing mechanism in the reinforcing and sealing device for the mine opening by the blasting in the mine.
Detailed Description
The present invention will be described with reference to specific examples.
Fig. 1 and fig. 3 are schematic structural diagrams of a reinforcing and sealing device for a mine hole in a mine well by blasting according to the present invention.
The invention relates to a reinforcing and sealing device for a mine opening by blasting in a mine, which comprises: the well seat comprises an upper well seat 10 and a lower well seat 20, the upper well seat 10 is arranged above the lower well seat 20 and is matched with the lower well seat, and the outer side wall of the upper well seat 10 is provided with a sealing and reinforcing mechanism 40; the reinforcing and sealing device for the mine mouth by the mine internal blasting further comprises a mine mouth 30, wherein a supporting and reinforcing mechanism 50 is arranged in the mine mouth 30, and a well lid 60 matched with the supporting and reinforcing mechanism 50 is arranged on the well lid 30; the seal reinforcement mechanism 40 and the support reinforcement mechanism 50 are used in a male-female fit. The sealing and reinforcing mechanism 40 comprises a connecting cylinder 41, a connecting interface 411 matched with the upper well base 10 is processed on the connecting cylinder 41, bumps 412 are arranged at two ends of the connecting cylinder 41, connecting plates 42 matched with the connecting cylinder 41 are arranged at two ends of the connecting cylinder 41, sliding grooves 421 matched with the bumps 412 are processed on the connecting plates 42, the sealing and reinforcing mechanism 40 further comprises a drill shaft 43 penetrating through the connecting plates 42 and the connecting cylinder 41, and a tightening device 431 is arranged on the drill shaft 43; support reinforcing mechanism 50 and include connecting cylinder 51 and lower connecting cylinder 52, it sets up for being linked together to go up connecting cylinder 51 and lower connecting cylinder 52, it all is provided with spread groove 53 in connecting cylinder 51 and the lower connecting cylinder 52 to go up, all be provided with adjusting device 54 on the spread groove 53, all be provided with the connecting axle 55 that cooperation adjusting device 54 used in the spread groove 53, connecting axle 55 both ends all are provided with joint cutter 56, adjusting device 54 is last to be provided with adjusting screw 57 that is used for adjusting connecting axle 55 tightness, adjusting screw 57 top is provided with handle portion 58, handle portion 58 below is provided with the reinforcement nut 59 that is used for the regulating action. The reinforcing and sealing device for the mine mouth in the mine blasting changes the traditional technical scheme on the premise of meeting the requirement of convenient use, adopts a new reinforcing and sealing technology, and utilizes the effect that the sealing and reinforcing mechanism 40 and the supporting and reinforcing mechanism 50 are formed into internal and external complementation and are matched for use, thereby greatly improving the reinforcing and sealing effect on the mine mouth, having very good stability, avoiding mine collapse caused by blasting, greatly improving the safety coefficient and protecting the life safety of mine workers, having better safety use performance and meeting the actual use requirement.
In a further modification, as shown in fig. 3, the upper connecting cylinder 51 and the lower connecting cylinder 52 are detachably connected, and a detachably-mounted connecting latch 70 is arranged at the joint of the upper connecting cylinder 51 and the lower connecting cylinder 52. The connecting structure is strong, the installation and the disassembly are convenient, and the requirements of practical application are met.
In a further modification, as shown in fig. 3, the well cover 60 is disposed on the top of the upper connecting cylinder 51, the threaded rod 61 is disposed below the well cover 60, the reinforcing part 511 is disposed on the upper portion of the upper connecting cylinder 51, and the reinforcing part 511 is provided with a threaded hole 512 for engaging with the threaded rod 61. The effect of cooperation use is better, has very strong integrated configuration, has satisfied the in-service use requirement.
Specifically, the flat plate part of the upper well seat 10 is laid with the mesh-shaped steel bar group, the lower well seat 20 part is laid with the annular steel bar group, and both the upper well seat 10 and the lower well seat 20 are formed by pouring concrete.
Specifically, the upper well base 10 includes an annular structure and a circular truncated cone-shaped structure, and the lower well base 20 is the annular structure, wherein, the inner hole of the upper well base 10 is two holes with a small upper part and a large lower part, and the diameter of the small hole is smaller than that of the well lid 60.
Specifically, as shown in fig. 1, a sealing gasket 80 is disposed between the sealing reinforcement mechanism 40 and the outer sidewall contact surface of the upper well base 10. The sealing performance is enhanced, and the use is convenient.
The foregoing is a detailed description of the invention with reference to specific embodiments, and the practice of the invention is not to be construed as limited thereto. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. A reinforced seal for a mine borehole for blasting in a mine, comprising: well seat, its characterized in that: the well seat comprises an upper well seat (10) and a lower well seat (20), the upper well seat (10) is arranged above the lower well seat (20) and is matched with the lower well seat, and a sealing and reinforcing mechanism (40) is arranged on the outer side wall of the upper well seat (10);
the reinforcing and sealing device for the mine mouth in the mine well by blasting further comprises a mine mouth (30), wherein a supporting and reinforcing mechanism (50) is arranged in the mine mouth (30), and a well lid (60) matched with the supporting and reinforcing mechanism (50) is arranged on the supporting and reinforcing mechanism;
the sealing reinforcing mechanism (40) and the supporting reinforcing mechanism (50) are used in an internal-external matching mode;
the sealing and reinforcing mechanism (40) comprises a connecting cylinder (41), a connecting interface (411) matched with the upper well seat (10) for use is processed on the connecting cylinder (41), convex blocks (412) are arranged at two ends of the connecting cylinder (41), connecting plates (42) matched with the convex blocks (412) for use are arranged at two ends of the connecting cylinder (41), a sliding groove (421) matched with the convex blocks (412) for use is processed on the connecting plates (42), the sealing and reinforcing mechanism (40) further comprises a drill spindle (43) penetrating through the connecting plates (42) and the connecting cylinder (41), and a tightening device (431) is arranged on the drill spindle (43);
mesh steel bar groups are laid on the flat plate part of the upper well seat (10), annular steel bar groups are laid on the lower well seat (20), and the upper well seat (10) and the lower well seat (20) are both formed by pouring concrete;
go up well seat (10) including annular structure and round platform column structure, well seat (20) are annular structure down, wherein, go up well seat (10) hole for big end down two holes, the aperture diameter is less than well lid (60) diameter.
2. The reinforcing and sealing device for mine shaft in mine shaft blasting according to claim 1, characterized in that: support reinforcing mechanism (50) and include connecting cylinder (51) and lower connecting cylinder (52), go up connecting cylinder (51) with connecting cylinder (52) sets up for being linked together down, go up connecting cylinder (51) with all be provided with spread groove (53) in connecting cylinder (52) down, all be provided with adjusting device (54) on spread groove (53), all be provided with the cooperation in spread groove (53) connecting axle (55) that adjusting device (54) used, connecting axle (55) both ends all are provided with joint cutter (56), be provided with adjusting screw (57) that are used for adjusting connecting axle (55) tightness on adjusting device (54), adjusting screw (57) top is provided with handle portion (58), handle portion (58) below is provided with reinforced nut (59) that are used for the regulating action.
3. The reinforcing and sealing device for mine shaft blasting in mine shaft according to claim 2, characterized in that: the upper connecting cylinder (51) and the lower connecting cylinder (52) are detachably connected, and a connecting clamping block (70) which is detachably mounted is arranged at the joint of the upper connecting cylinder (51) and the lower connecting cylinder (52).
4. The reinforcing and sealing device for mine shaft blasting in mine shaft according to claim 2, characterized in that: well lid (60) set up go up connecting cylinder (51) top, well lid (60) below is provided with threaded rod (61), it is provided with rib (511) to go up connecting cylinder (51) upper portion, rib (511) are provided with the cooperation threaded hole (512) that threaded rod (61) used.
5. The reinforcing and sealing device for mine shaft in mine shaft blasting according to claim 1, characterized in that: and a sealing gasket (80) is arranged between the sealing and reinforcing mechanism (40) and the contact surface of the outer side wall of the upper well seat (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810458237.2A CN108708729B (en) | 2016-08-09 | 2016-08-09 | A consolidate sealing device that is used for blasting in pit to mine mouth |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610646515.8A CN106285689B (en) | 2016-08-09 | 2016-08-09 | It is a kind of to be used for reinforcing sealing device of the mine blast in well to pithead |
| CN201810458237.2A CN108708729B (en) | 2016-08-09 | 2016-08-09 | A consolidate sealing device that is used for blasting in pit to mine mouth |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610646515.8A Division CN106285689B (en) | 2016-08-09 | 2016-08-09 | It is a kind of to be used for reinforcing sealing device of the mine blast in well to pithead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108708729A CN108708729A (en) | 2018-10-26 |
| CN108708729B true CN108708729B (en) | 2020-06-05 |
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Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610646515.8A Active CN106285689B (en) | 2016-08-09 | 2016-08-09 | It is a kind of to be used for reinforcing sealing device of the mine blast in well to pithead |
| CN201810458237.2A Active CN108708729B (en) | 2016-08-09 | 2016-08-09 | A consolidate sealing device that is used for blasting in pit to mine mouth |
| CN201810458235.3A Active CN108708728B (en) | 2016-08-09 | 2016-08-09 | It is a kind of for mine blast in well to the reinforcing sealing device of pithead |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610646515.8A Active CN106285689B (en) | 2016-08-09 | 2016-08-09 | It is a kind of to be used for reinforcing sealing device of the mine blast in well to pithead |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810458235.3A Active CN108708728B (en) | 2016-08-09 | 2016-08-09 | It is a kind of for mine blast in well to the reinforcing sealing device of pithead |
Country Status (1)
| Country | Link |
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| CN (3) | CN106285689B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271063B (en) * | 2020-01-20 | 2022-03-25 | 黑龙江工业学院 | A consolidate sealing device that is used for blasting in pit to mine mouth |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2518772B2 (en) * | 1992-06-13 | 1996-07-31 | 株式会社金澤製作所 | Vertical pit seal device |
| CN2642839Y (en) * | 2003-08-15 | 2004-09-22 | 王守利 | Easily opening and closing sealed anti-theft well mouth |
| CN102401616A (en) * | 2011-10-11 | 2012-04-04 | 中国矿业大学(北京) | Blasting excavation method of vertical shaft |
| CN202390857U (en) * | 2012-01-10 | 2012-08-22 | 刘建华 | Inspection wellhead reinforcement structure |
| CN103422862B (en) * | 2013-07-26 | 2015-08-12 | 王绍华 | Large aperture boring Drilling vertical shaft method |
| CN203717014U (en) * | 2014-03-10 | 2014-07-16 | 山东科技大学 | Novel explosion-proof apparatus for return air vertical shaft |
| RU144329U1 (en) * | 2014-04-08 | 2014-08-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кузбасский государственный технический университет имени Т.Ф. Горбачева" (КузГТУ) | DEVICE FOR Dismounting Shaft Barrier Reinforcement Elements |
| CN205315001U (en) * | 2015-12-14 | 2016-06-15 | 西安汇科地质技术服务有限责任公司 | Opening of mines reinforcing apparatus |
| CN105714859A (en) * | 2016-03-15 | 2016-06-29 | 万庆昆 | Reinforcing device for opening of inspection chamber |
-
2016
- 2016-08-09 CN CN201610646515.8A patent/CN106285689B/en active Active
- 2016-08-09 CN CN201810458237.2A patent/CN108708729B/en active Active
- 2016-08-09 CN CN201810458235.3A patent/CN108708728B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108708728B (en) | 2019-07-19 |
| CN108708728A (en) | 2018-10-26 |
| CN106285689B (en) | 2018-10-09 |
| CN106285689A (en) | 2017-01-04 |
| CN108708729A (en) | 2018-10-26 |
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