CN109484795B - Deviation-preventing belt conveyor for coal mine - Google Patents
Deviation-preventing belt conveyor for coal mine Download PDFInfo
- Publication number
- CN109484795B CN109484795B CN201811444496.6A CN201811444496A CN109484795B CN 109484795 B CN109484795 B CN 109484795B CN 201811444496 A CN201811444496 A CN 201811444496A CN 109484795 B CN109484795 B CN 109484795B
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- belt
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- deviation
- bolts
- transmission
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- 239000003245 coal Substances 0.000 title claims abstract description 19
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 238000012937 correction Methods 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 239000007921 spray Substances 0.000 claims description 8
- 238000013016 damping Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/60—Arrangements for supporting or guiding belts, e.g. by fluid jets
- B65G15/64—Arrangements for supporting or guiding belts, e.g. by fluid jets for automatically maintaining the position of the belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/02—Adaptations of individual rollers and supports therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors
- B65G39/10—Arrangements of rollers
- B65G39/12—Arrangements of rollers mounted on framework
- B65G39/16—Arrangements of rollers mounted on framework for aligning belts or chains
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G41/00—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames
- B65G41/006—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames with the conveyor not adjustably mounted on the supporting frame or base
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structure Of Belt Conveyors (AREA)
Abstract
The invention belongs to the technical field of coal mining equipment, in particular to an anti-deviation belt conveyor for coal mines, which comprises a frame, a transmission roller and a belt, wherein the transmission roller and the belt are arranged on the frame and used for transmission, and the belt conveyor also comprises an anti-deviation mechanism which is arranged on the frame and used for preventing the belt from deviating; the anti-polarization mechanism comprises a plurality of anti-polarization wheels which are downwards arranged and are in friction contact with the side wall of the belt, and the anti-polarization wheels are evenly distributed on two sides of the belt and are arranged and extended along the transmission direction of the belt; the anti-deflection wheel is hinged on the bent connecting rod, the connecting rod is connected with the upper end of the rack through a first bolt and a first nut, a first sliding groove capable of enabling the first bolt to slide left and right is arranged at the upper end of the rack, and the left side of the connecting rod is connected with the left wall and the right wall of the rack through a second bolt and a second nut; the axle of the anti-deflection wheel is vertical to the belt transmission direction; the frame upper end evenly is equipped with a plurality of correction boards along belt extending direction, and the big end rotation of first bolt is installed in the correction board, and the correction board contacts with the frame top.
Description
Technical Field
The invention belongs to the technical field of coal mining equipment, and particularly relates to an anti-deviation belt conveyor for a coal mine.
Background
The belt conveyor is widely used in various industries of national production and plays an irreplaceable role in social development, wherein the belt conveyor is used in coal mine exploitation, the belt conveyor transports the exploited coal mine in the coal mine production, the belt conveyor runs at a high speed and is stable, the noise is low, the belt conveyor can convey on an ascending and descending slope, the coal mine exploitation speed is effectively improved, but the belt conveyor can generate a deviation phenomenon in the use process, and belt abrasion is caused, so that the belt conveyor for preventing the deviation for the coal mine is needed.
In the prior art, there is also an anti-deviation belt conveyor, for example, an anti-deviation belt conveyor disclosed in a chinese patent with the application number 201510151126.3, which comprises a belt and a plurality of groove-shaped carrier roller sets, the belt comprises a base belt and two anti-deviation ribs, and the two anti-deviation ribs are located on a non-working surface of the base belt; the anti-deviation rib is parallel to the baseband edge of the baseband; the groove-shaped carrier roller group comprises two side carrier rollers and a middle carrier roller, the axial lead of the middle carrier roller is horizontal, the side carrier rollers are symmetrically distributed on two sides of the middle carrier roller, the axial leads of the three carrier rollers are in a vertical plane, and the three carrier rollers form a groove shape; a roller gap is arranged between two end surfaces of the middle carrier roller and the adjacent end surfaces of the connecting carrier roller; the anti-deviation rib is embedded into the roller gap.
The belt deviation prevention device can prevent the belt from deviating to a certain extent, but has poor effect, the belt is still easy to damage, and the long-term use of the belt is not facilitated.
Disclosure of Invention
In order to make up for the defects of the prior art, the invention provides the anti-deviation belt conveyor for the coal mine. The belt deviation preventing device is mainly used for solving the problem of belt deviation of the deviation preventing belt conveyor.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to an anti-deviation belt conveyor for a coal mine, which comprises a frame, a transmission roller and a belt, wherein the transmission roller and the belt are arranged on the frame and used for transmission, and the belt conveyor also comprises a deviation stopping mechanism which is arranged on the frame and used for stopping deviation of the belt; the anti-polarization mechanism comprises a plurality of anti-polarization wheels which are downwards arranged and are in friction contact with the side wall of the belt, and the anti-polarization wheels are evenly distributed on two sides of the belt and extend in a row along the conveying direction of the belt; the anti-deviation wheels are hinged to the bent connecting rods, the number of the anti-deviation wheels is the same as that of the connecting rods, the connecting rods are connected with the upper end of the rack through first bolts and first nuts, first sliding grooves capable of enabling the first bolts to slide left and right are arranged at the upper end of the rack, second sliding grooves for enabling the second bolts to move up and down are arranged on the left and right walls of the rack through second bolts and second nuts, and the first bolts, the first nuts, the second bolts and the second nuts are used for adjusting positions of the connecting rods and the anti-deviation wheels, so that the anti-deviation belt can adapt to various belts; the wheel shaft of the anti-deviation wheel is perpendicular to the belt transmission direction; the upper end of the frame is uniformly provided with a plurality of correction plates along the extending direction of the belt, the large end of the first bolt is rotatably arranged in the correction plates, the correction plates are contacted with the top of the frame, the distance between two first sliding grooves which are adjacent front and back is the same as the distance between holes which are adjacent to the correction plates and are used for installing the first bolt, and the correction plates are used for enabling the deflection-stopping wheels to be positioned on the same straight line.
The frame bottom is equipped with a plurality of snubber blocks along belt extending direction, and the snubber block includes roof, bottom plate and spring, and the spring is connected roof and bottom plate, and the roof is connected with the frame bottom, and the snubber block is used for carrying out the shock attenuation to preventing belt off tracking machine, has avoided belt feeder vibrations to cause the frequent off tracking of belt.
Be equipped with the mounting groove on the roof, the frame bottom is equipped with the arch, and the frame bottom is installed in the mounting groove through protruding, and the mounting groove makes the change of snubber block more convenient with protruding, and less snubber block changes required time, has improved work efficiency.
And a spray head is arranged below the transmission roller and used for blowing air to the transmission roller to cool the transmission roller, so that the service life of the transmission roller is prolonged. The spray head is in communication with a source of compressed air.
The transmission roller is internally provided with the inner spiral groove, the inner spiral groove improves the heat radiation capacity of the transmission roller, the heat dissipation in the transmission roller is facilitated, and the service life of the transmission roller is prolonged.
The outside of the transmission roller is provided with an outer spiral groove, and the outer spiral groove is used for cooling the transmission roller by matching with the air blown by the spray head, so that the service life of the transmission roller is prolonged.
The bottom plate is provided with a through hole, the bottom plate is in contact with the ground, and the device can be fixed on the ground through the through hole by using bolts.
The beneficial effects of the invention are as follows:
1. According to the anti-deviation belt conveyor for the coal mine, the belt is limited through the anti-deviation wheel, so that the deviation of the belt is effectively avoided, and meanwhile, the anti-deviation wheel is more convenient to adjust through the connecting rod, the first bolt, the first nut, the second bolt and the second nut, so that the anti-deviation belt conveyor can adapt to the belts with various sizes, and the application range of the anti-deviation belt conveyor is improved.
2. According to the anti-deviation belt conveyor for the coal mine, the correction plate is arranged, so that the first bolts are positioned on the same straight line, the adjusted anti-deviation wheels are positioned on the same straight line, and the anti-deviation wheels can effectively limit the belt.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic illustration of the connection of a first bolt to a correction plate according to the present invention;
fig. 3 is a schematic distribution of the inner and outer spiral grooves on the transfer roll of the present invention.
In the figure: the device comprises a frame 1, a transmission roller 2, a belt 3, a polarization-stopping mechanism 4, a correction plate 5, a damping block 6, a spray head 7, a first chute 11, a second chute 12, an inner spiral groove 21, an outer spiral groove 22, a polarization-stopping wheel 41, a connecting rod 42, a first bolt 43, a second bolt 44, a top plate 61, a bottom plate 62, a mounting groove 63 and a through hole 64.
Detailed Description
The deviation preventing belt conveyor for a coal mine according to an embodiment of the present invention will be described below with reference to fig. 1 to 3.
As shown in fig. 1 and 2, the anti-deviation belt conveyor for the coal mine comprises a frame 1, a transmission roller 2 and a belt 3, wherein the transmission roller 2 and the belt 3 are arranged on the frame 1 and used for transmission, and the anti-deviation mechanism 4 is arranged on the frame 1 and used for preventing the belt 3 from deviating; the polarization-stopping mechanism 4 comprises a plurality of polarization-stopping wheels 41 which are downwards arranged and are in friction contact with the side wall of the belt 3, and the polarization-stopping wheels 41 are evenly distributed on two sides of the belt 3 and are arranged and extended along the conveying direction of the belt 3; the anti-deviation wheels 41 are hinged to the bent connecting rods 42, the number of the anti-deviation wheels 41 is the same as that of the connecting rods 42, the connecting rods 42 are connected with the upper end of the frame 1 through first bolts 43 and first nuts, first sliding grooves 11 which can enable the first bolts 43 to slide left and right are arranged at the upper end of the frame 1, the left side of the connecting rods 42 is connected with the left and right walls of the frame 1 through second bolts 44 and second nuts, second sliding grooves 12 for enabling the second bolts 44 to move up and down are arranged on the left and right walls of the frame 1, and the first bolts 43, the first nuts, the second bolts 44 and the second nuts are used for adjusting the positions of the connecting rods 42 and the anti-deviation wheels 41, so that the anti-deviation of the belt 3 can adapt to various different belts 3; the wheel axle of the anti-deviation wheel 41 is vertical to the transmission direction of the belt 3; the upper end of the frame 1 is uniformly provided with a plurality of correction plates 5 along the extending direction of the belt 3, the large ends of the first bolts 43 are rotatably arranged in the correction plates 5, the correction plates 5 are contacted with the top of the frame 1, the distance between two first sliding grooves 11 adjacent front and back is the same as the distance between the holes adjacent to the correction plates 5 for installing the first bolts 43, and the correction plates 5 are used for enabling the polarization-stopping wheels 41 to be positioned on the same straight line.
As shown in fig. 1, a plurality of shock-absorbing blocks 6 are arranged at the bottom of the frame 1 along the extending direction of the belt 3, the shock-absorbing blocks 6 comprise a top plate 61, a bottom plate 62 and springs, the springs are used for connecting the top plate 61 with the bottom plate 62, the top plate 61 is connected with the bottom of the frame 1, and the shock-absorbing blocks 6 are used for absorbing shock of the anti-deviation machine of the belt 3, so that frequent deviation of the belt 3 caused by vibration of the belt conveyor is avoided.
As shown in fig. 1, the top plate 61 is provided with a mounting groove 63, the bottom of the frame 1 is provided with a protrusion, the bottom of the frame 1 is mounted in the mounting groove 63 through the protrusion, the mounting groove 63 and the protrusion facilitate the replacement of the damper 6, the time required for the replacement of the damper 6 is reduced, and the working efficiency is improved.
As shown in fig. 1, a spray head 7 is arranged below the conveying roller 2, and the spray head 7 is used for blowing air to the conveying roller 2 to cool the conveying roller 2, so that the service life of the conveying roller 2 is prolonged. The nozzle 7 communicates with a source of compressed air.
As shown in fig. 3, the inner spiral groove 21 is provided inside the transmission roller 2, and the inner spiral groove 21 improves the heat dissipation capability of the transmission roller 2, facilitates the heat dissipation in the transmission roller 2, and improves the service life of the transmission roller 2.
As shown in fig. 3, an outer spiral groove 22 is arranged outside the conveying roller 2, and the outer spiral groove 22 is used for cooling the conveying roller 2 by matching with wind blown by the spray head 7, so that the service life of the conveying roller 2 is prolonged.
As shown in fig. 1, the bottom plate 62 is provided with a through hole 64, the bottom plate 62 is in contact with the ground, and the device can be fixed on the ground through the through hole 64 by using bolts.
Working principle:
During operation, operating personnel manually adjust bolt 43, nut No. one, bolt No. two 44 and nut No. two, thereby realize the regulation to connecting rod 42 and the position of stopping wheel 41, make prevent belt 3 off tracking can adapt to the belt 3 of multiple different sizes, the application scope of preventing belt 3 off tracking machine has been improved, correct board 5 connects a plurality of bolts 43 as a whole, make the stopping wheel 41 after adjusting lie in same straight line, in the belt 3 motion process, stopping wheel 41's lateral wall has spacing to belt 3, stopping wheel 41 articulates at connecting rod 42 lower extreme makes stopping wheel 41 can rotate along with belt 3, the hindrance effect of stopping wheel 41 to belt 3 has been reduced, the transmission speed of belt 3 has been improved, work efficiency has been improved, damper 6 has played the cushioning effect to preventing belt 3 off tracking machine, the belt 3 is because of vibrations off tracking, shower nozzle 7 is to the outer helical groove 22 on conveyor roller 2 mutually support, the inner race 2 has been removed dust to the conveying roller 2, the effectual improvement of carrying roller 2 has carried out dust removal simultaneously, the inside diameter of the inner race 21 has been realized, the inner race 2 has been further improved, the service life of the damper 2 has been realized, the inner race 2 has been replaced the damper 2, the end has been more convenient to change, the machine frame has been realized, the service life of the damper 2 has been more convenient, and has been changed, and has been more convenient and has been changed, and has been used.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (3)
1. The utility model provides a colliery is with preventing off tracking belt feeder, includes frame (1), sets up transmission roller (2) and belt (3) that are used for the transmission on frame (1), its characterized in that: the belt conveyor further comprises a deviation stopping mechanism (4) which is arranged on the frame (1) and used for stopping the deviation of the belt (3); the polarization-stopping mechanism (4) comprises a plurality of polarization-stopping wheels (41) which are downwards arranged and are in friction contact with the side wall of the belt (3), and the polarization-stopping wheels (41) are evenly distributed on two sides of the belt (3) and are arranged and extended along the transmission direction of the belt (3); the anti-deflection wheels (41) are hinged to bent connecting rods (42), the number of the anti-deflection wheels (41) is the same as that of the connecting rods (42), the connecting rods (42) are connected with the upper end of the frame (1) through first bolts (43), first sliding grooves (11) which can enable the first bolts (43) to slide left and right are arranged at the upper end of the frame (1), the left side of the connecting rods (42) is connected with the left wall and the right wall of the frame (1) through second bolts (44), and second sliding grooves (12) for enabling the second bolts (44) to move up and down are arranged on the left wall and the right wall of the frame (1); the wheel shaft of the anti-deviation wheel (41) is vertical to the transmission direction of the belt (3); the upper end of the frame (1) is uniformly provided with a plurality of correction plates (5) along the extending direction of the belt (3), the large ends of the first bolts (43) are rotatably arranged in the correction plates (5), the correction plates (5) are contacted with the top of the frame (1), and the distance between two front and rear adjacent first sliding grooves (11) is the same as the distance between the holes, adjacent to the first bolts (43), on the correction plates (5) for installing;
The bottom of the frame (1) is provided with a plurality of damping blocks (6) along the extending direction of the belt (3), each damping block (6) comprises a top plate (61), a bottom plate (62) and springs, the springs are used for connecting the top plate (61) with the bottom plate (62), and the top plate (61) is connected with the bottom of the frame (1);
a spray head (7) is arranged below the transmission roller (2);
an inner spiral groove (21) is formed in the conveying roller (2);
An outer spiral groove (22) is formed in the outer portion of the conveying roller (2).
2. The anti-deviation belt conveyor for coal mines according to claim 1, wherein: the top plate (61) is provided with a mounting groove (63), the bottom of the frame (1) is provided with a bulge, and the bottom of the frame (1) is mounted in the mounting groove (63) through the bulge.
3. The anti-deviation belt conveyor for coal mines according to claim 1, wherein: the bottom plate (62) is provided with a through hole (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811444496.6A CN109484795B (en) | 2018-11-29 | 2018-11-29 | Deviation-preventing belt conveyor for coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811444496.6A CN109484795B (en) | 2018-11-29 | 2018-11-29 | Deviation-preventing belt conveyor for coal mine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109484795A CN109484795A (en) | 2019-03-19 |
| CN109484795B true CN109484795B (en) | 2024-05-21 |
Family
ID=65698678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811444496.6A Active CN109484795B (en) | 2018-11-29 | 2018-11-29 | Deviation-preventing belt conveyor for coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109484795B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158533B (en) * | 2020-10-13 | 2022-04-08 | 安徽德基汇金机械科技有限公司 | Self-adaptive anti-deviation belt rack |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2007202586A1 (en) * | 2007-06-06 | 2009-01-08 | Gang Lin | Passive hydraulic control deviation-correcting linkage machine |
| CN102587931A (en) * | 2012-03-15 | 2012-07-18 | 中交天和机械设备制造有限公司 | Shielding belt conveyor |
| KR20140079672A (en) * | 2012-12-18 | 2014-06-27 | 주식회사 포스코 | Ore fall preventing apparatus for belt conveyor |
| CN206187911U (en) * | 2016-08-30 | 2017-05-24 | 安徽纪兴源科技股份有限公司 | Single roll coater's preventing belt deviation device |
| CN107055033A (en) * | 2017-05-03 | 2017-08-18 | 盐城晟阳电子科技有限公司 | A kind of deviation-preventing belt conveyor |
| CN209382791U (en) * | 2018-11-29 | 2019-09-13 | 安徽省皖北煤电集团有限责任公司 | A kind of anti-deviation belt feeder of coal mine |
-
2018
- 2018-11-29 CN CN201811444496.6A patent/CN109484795B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2007202586A1 (en) * | 2007-06-06 | 2009-01-08 | Gang Lin | Passive hydraulic control deviation-correcting linkage machine |
| CN102587931A (en) * | 2012-03-15 | 2012-07-18 | 中交天和机械设备制造有限公司 | Shielding belt conveyor |
| KR20140079672A (en) * | 2012-12-18 | 2014-06-27 | 주식회사 포스코 | Ore fall preventing apparatus for belt conveyor |
| CN206187911U (en) * | 2016-08-30 | 2017-05-24 | 安徽纪兴源科技股份有限公司 | Single roll coater's preventing belt deviation device |
| CN107055033A (en) * | 2017-05-03 | 2017-08-18 | 盐城晟阳电子科技有限公司 | A kind of deviation-preventing belt conveyor |
| CN209382791U (en) * | 2018-11-29 | 2019-09-13 | 安徽省皖北煤电集团有限责任公司 | A kind of anti-deviation belt feeder of coal mine |
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| Publication number | Publication date |
|---|---|
| CN109484795A (en) | 2019-03-19 |
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