CN110410074B - Enclasping device and heading machine telescopic mechanism - Google Patents
Enclasping device and heading machine telescopic mechanism Download PDFInfo
- Publication number
- CN110410074B CN110410074B CN201910766178.XA CN201910766178A CN110410074B CN 110410074 B CN110410074 B CN 110410074B CN 201910766178 A CN201910766178 A CN 201910766178A CN 110410074 B CN110410074 B CN 110410074B
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- Prior art keywords
- brake pad
- cylinder
- seat
- pad seat
- telescopic
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- 238000005299 abrasion Methods 0.000 abstract description 6
- 239000003245 coal Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
Abstract
The invention relates to a hugging device and a development machine telescopic mechanism, wherein the hugging device comprises a brake pad and a brake pad seat, the main body of the brake pad seat and the brake pad are of cylindrical structures, the brake pad is coaxially fixed on the main body of the brake pad seat, the inner surface of the brake pad is a cylindrical surface, the outer surface of the front part is an outer conical surface with small front part and big rear part and is positioned in front of the brake pad seat, the periphery of the main body of the brake pad seat is fixedly connected with cylinder rods or cylinder barrels of a plurality of piston cylinders, and the telescopic directions of the cylinder rods are all along the axial direction of the brake pad; the telescopic mechanism of the heading machine comprises a fixed arm, a telescopic arm and a enclasping device, wherein the telescopic arm is in linear sliding fit with the fixed arm in the fixed arm, the enclasping device is sleeved on the telescopic arm and is positioned behind the fixed arm, an inner hole at the rear end part of the fixed arm is arranged into an inner conical surface with a large outer part and a small inner part, and a cylinder barrel or a cylinder rod of the piston cylinder is fixedly installed relative to the fixed arm. The invention can eliminate the gap between the telescopic sliding pairs, improve the rigidity of the cutting mechanism, reduce the vibration impact during cutting and reduce the abrasion.
Description
Technical Field
The invention relates to a holding device of a telescopic cutting mechanism of a coal mine heading machine and the telescopic cutting mechanism of the heading machine adopting the holding device.
Background
When the traditional telescopic cutting mechanism of the tunneling machine for the coal mine works, a gap exists between the telescopic sliding pairs. The working environment of the underground coal mine is particularly severe, the impact vibration is large, and the pollution is serious. With the accumulation of the service time of the machine, the friction surface between the telescopic sliding pairs is seriously worn in a certain time, the gap is increased, and the impact and vibration are aggravated when the cutting mechanism works, so that the frame and the transmission part of the cutting mechanism can be damaged. The impact is transmitted to the airframe, thereby causing early failure of the hydraulic and electrical components.
Disclosure of Invention
The invention aims to provide a holding device and a telescopic mechanism of a heading machine, which can eliminate the gap between telescopic sliding pairs when the cutting mechanism of the heading machine works, improve the rigidity of the cutting mechanism, reduce the vibration impact during cutting, reduce abrasion, and improve the reliability and the service life of the cutting mechanism.
The main technical scheme of the invention is as follows:
The utility model provides a hug tightly device, includes brake block and brake block seat, the main part of brake block seat with the brake block is cylindrical structure, the brake block is coaxial to be fixed in the main part of brake block seat, the internal surface of brake block is the face of cylinder, the anterior external surface of brake block is big outer conical surface in back little, is located under the installed state the place ahead of brake block seat, the periphery of the main part of brake block seat and the jar pole or the cylinder fixed connection of a plurality of piston jar, a plurality of piston jar are along circumferencial direction interval distribution, and its flexible direction of jar pole all is followed the axial of brake block.
The brake pad seat is preferably formed by splicing two brake pad seat units with arc-shaped middle parts and lug seats at two ends, the lug seats extend outwards along the radial direction of the arc shape of the middle part, the two lug seats are attached and fixed between the two brake pad seat units, and the periphery of the main body of the brake pad seat is fixedly connected with a cylinder rod or a cylinder barrel of the piston cylinder through the lug seats.
The rear part of the brake pad can be provided with an outer cylindrical surface, the rear part of the brake pad is fixedly embedded in the brake pad seat, and the front part of the outer cylindrical surface is exposed in front of the brake pad seat in the installation state.
The rear part of the brake pad is also preferably provided with a ring table protruding radially outwards, the inner hole wall of the main body of the brake pad seat is correspondingly provided with a ring groove, and the ring table is radially embedded into the ring groove.
The utility model discloses a brake block, including the brake block, the brake block is equipped with the back of the brake block, the brake block is last along the whole circumference preferably evenly to be equipped with a plurality of front notch and a plurality of back notch, front notch and back notch are followed the axial extension's of brake block narrow slit structure, its length is greater than the axial dimension of brake block half, the unique opening of front notch is in the front edge of brake block, the unique opening of back notch is in the back edge of brake block, front notch and back notch one-to-one interval arrangement.
The utility model provides a development machine telescopic machanism, includes fixed arm, flexible arm and hug tightly the device, flexible arm in the fixed arm with fixed arm straight line sliding fit, the part that is close to the axle center of fixed arm is equipped with an axial interruption, and the part that keeps away from the axle center corresponding with this axial interruption still keeps to continuous whole in front and back, and axial interruption department exposes one section flexible arm, hug tightly the device install in this axial interruption department and cover on the flexible arm, the anterior hole of fixed arm next-door neighbour interruption department sets up to be the big interior small interior conical surface in outside, its tapering equals the tapering of the anterior surface of brake block, cylinder or jar pole of piston jar are relative fixed mounting of fixed arm.
The beneficial effects of the invention are as follows:
The clasping device realizes the switching between eliminating the clearance of the telescopic sliding pair and recovering the clearance of the telescopic sliding pair through the axial reciprocating movement between the fixed arm and the telescopic arm of the telescopic mechanism. When the working arm works, the telescopic sliding pair clearance is eliminated by the enclasping device, so that the rigidity of the cutting mechanism can be obviously improved, the vibration impact during cutting can be effectively reduced, the working reliability and the service life of the cutting mechanism can be improved, and the negative effects on the transmission part, the hydraulic pressure of the whole machine, an electric control system and the like under the vibration working condition can be further reduced.
When the telescopic sliding pair gap is eliminated, the fixed arm and the telescopic arm of the cutting mechanism are kept relatively static, so that the abrasion of the abrasion-resistant sleeve between the fixed arm and the telescopic arm can be effectively reduced, and the service life of the abrasion-resistant sleeve and even the whole cutting mechanism is prolonged.
When the telescopic arm of the telescopic mechanism of the heading machine is clasped, due to the self-locking design, the clasping state can be always effective and reliable without being influenced by vibration and impact under the condition that the clasping device is not actively opened.
Drawings
FIG. 1 is a schematic view of an embodiment of the hugging device;
FIG. 2 is a schematic view of the piston cylinder;
FIG. 3 is a schematic structural view of the brake pad;
FIG. 4 is a schematic structural view of the brake pad holder unit;
FIG. 5 is a schematic diagram of an embodiment of the heading machine telescoping mechanism.
Description of the drawings:
1. A brake pad; 11. an outer conical surface; 12. an outer cylindrical surface; 13. a front notch; 14. a rear notch;
2. A brake pad seat; 21. a shutter base unit; 211. an ear seat;
3. a piston cylinder; 31. a cylinder; 32. a cylinder rod; 33. a belleville spring; 34. a joint;
4. a threaded coupling;
5. A fixed arm; 51. an inner conical surface;
6. A telescoping arm;
7. A clasping device;
8. wear-resistant sleeve.
Detailed Description
The invention discloses a holding device, which comprises a brake pad 1 and a brake pad seat 2, wherein the main body of the brake pad seat and the brake pad are of cylindrical structures, and the brake pad is coaxially fixed on the main body of the brake pad seat. The inner surface of the brake pad is a cylindrical surface, the outer surface of the front part of the brake pad is an outer conical surface 11 with a small front part and a big rear part, the outer periphery of the main body of the brake pad seat is fixedly connected with cylinder rods 32 or cylinder barrels 31 of a plurality of piston cylinders 3, the plurality of piston cylinders are distributed at intervals along the circumferential direction, and the telescopic directions of the cylinder rods of the plurality of piston cylinders are along the axial direction of the brake pad and are also the front-rear direction.
The inner diameter of the main body of the brake pad seat is larger than the inner diameter of the brake pad.
The material of the brake pad is preferably high-strength spring steel.
When the cylinder rod stretches relative to the cylinder barrel, the brake pad seat drives the brake pad to reciprocate back and forth, and the front position and the rear position of the brake pad correspond to the enclasping device respectively and are in enclasping and loosening states.
The piston cylinders are preferably uniformly circumferentially distributed so that the push-pull force on the shoe and shoe is more uniform in the circumferential direction to ensure axial translation of the shoe without skewing and twisting. In this embodiment, two of the piston cylinders are disposed 180 degrees from each other.
As shown in fig. 4, the brake pad holder may be formed by splicing two brake pad holder units 21 with arc middle parts and lug holders 211 at two ends, the lug holders extend outwards along the radial direction of the arc shape of the middle part, the two lug holders are attached between the two brake pad holder units and are fixed by a threaded connector 4, and the periphery of the main body of the brake pad holder is fixedly connected with a cylinder rod or cylinder barrel of the piston cylinder by the lug holders.
As shown in fig. 2, the piston cylinder is preferably a single-acting piston cylinder.
Further, the piston cylinder is a single-rod piston cylinder, and a disc spring 33 is arranged in a rod cavity of the piston cylinder. The belleville spring is sleeved on the cylinder rod. Fluid medium enters the rodless chamber through the connector 34, pushing the cylinder rod outward. When fluid medium returns through the fitting 34, the belleville springs in the rod chamber rebound to retract the cylinder rod.
In the embodiment, the piston cylinder adopts a hydraulic cylinder, so that the output is large and stable.
As shown in fig. 3 and 5, the rear portion of the brake pad may be provided with an outer cylindrical surface 12, the outer conical surface 11 is adjacent to the outer cylindrical surface 12 in front-rear direction, the rear portion of the brake pad is fixedly embedded in the brake pad holder, and the front portion of the outer cylindrical surface is preferably exposed in front of the brake pad holder in the mounted state. The outer diameter of the outer cylindrical surface is generally equal to the maximum diameter of the outer conical surface.
In this embodiment, the rear portion of the brake pad may be a ring table protruding radially and preferably arranged on the outer cylindrical surface 12, and a ring groove is correspondingly arranged on the inner hole wall of the main body of the brake pad seat, and the ring table is radially embedded into the ring groove, so as to realize the fixed connection between the brake pad and the main body of the brake pad seat. The ring grooves can play a good role in limiting the brake pad in both radial and axial directions. When the brake pad is detached, at least one brake pad seat unit is detached first, and then the brake pad is taken out.
The brake pad is characterized in that a plurality of front notches 13 and a plurality of rear notches 14 are uniformly formed in the whole circumference of the brake pad, the front notches and the rear notches are narrow slit structures extending along the axial direction of the brake pad, the length of the narrow slit structures is larger than half of the axial dimension of the brake pad, the unique opening of the front notch is arranged at the front edge of the brake pad, the unique opening of the rear notch is arranged at the rear edge of the brake pad, and the front notches and the rear notches are arranged at intervals one by one to form an S-shaped notch. By utilizing the deformation of the S-shaped notch, when the enclasping device is in an enclasping state, the front part of the brake pad and other parts adjacent to the inside and the outside can be wedged tightly, so that enclasping is more reliable.
The edges of the respective extreme ends (i.e. the innermost ends of the narrow slit structures) of the front notch and the rear notch are preferably in smooth curve transition, and the curvature radius is preferably larger than half of the width of the narrow slit, so that the deformation amount of the brake pad is increased, and the stress concentration during the deformation of the brake pad can be avoided or reduced.
In the embodiment shown in the drawings, the cylinder rod 32 of the piston cylinder is fixedly connected with the brake pad holder, specifically, the cylinder rod passes through a pair of ear holders fixed together, and is fastened by using a connecting bolt or the like.
The invention also discloses a telescopic mechanism of the heading machine, which comprises a fixed arm 5, a telescopic arm 6 and the enclasping device 7, wherein the telescopic arm is in linear sliding fit with the fixed arm in the fixed arm. The part of the fixed arm, which is close to the shaft center, is provided with an axial interruption, and the part, which is far away from the shaft center and corresponds to the axial interruption, is still kept as a whole which is continuous in front and back. The axial interruption exposes a section of telescopic arm. The enclasping device is arranged at the axial interruption position and sleeved on the telescopic arm. The front inner hole of the fixed arm close to the break is set as an inner conical surface 51 with the outer big and the inner small, and the taper of the inner conical surface is equal to that of the front outer conical surface 11 of the brake pad. By wedging the front part of the brake pad into the inner hole at the front part of the fixed arm, which is close to the break, the gap between the telescopic arm and the fixed arm is eliminated, so that no relative movement exists between the fixed arm and the telescopic arm, and the clamping is realized. The enclasping device can obviously improve the rigidity of the telescopic mechanism of the heading machine, reduce the vibration impact during cutting, reduce abrasion, and improve the reliability and the service life of the telescopic mechanism of the heading machine. The cylinder barrel or the cylinder rod of the piston cylinder is arranged on the fixed arm.
And in the case that the cylinder rod of the piston cylinder is fixedly connected with the brake pad seat, the cylinder barrel of the piston cylinder is arranged on the fixed arm.
Before the telescopic mechanism is required to perform telescopic action, the rodless cavity of the piston cylinder of the enclasping device is filled with oil, and the piston and the cylinder rod drive the brake pad seat and the brake pad to move backwards, so that the conical brake pad of the enclasping device is unlocked, a clearance is restored between the fixed arm and the telescopic arm, and smooth telescopic action is ensured. After the telescopic action of the telescopic mechanism is stopped and before the cutting mechanism is ready for operation, the rodless cavity of the piston cylinder of the enclasping device returns oil, the disc spring in the rod cavity of the piston cylinder pushes the brake pad seat and the brake pad to move forwards, the brake pad enclasps the telescopic arm forwards, the sliding pair gap between the fixed arm and the telescopic arm is eliminated, the quasi-rigidity is kept, the vibration impact during cutting is effectively reduced, and the working reliability and the service life of the cutting mechanism are improved.
By deformation of the S-shaped notch, the outer conical surface 11 of the brake pad and the inner conical surface 51 of the fixed arm can be wedged more tightly, and the brake pad can tightly hold the telescopic arm. The taper designs of the outer conical surface 11 and the inner conical surface 51 also meet the self-locking condition.
Through setting up hug tightly the device, keep relatively static between fixed arm and the telescopic boom during operation, consequently can reduce the wearing and tearing of fixed wear-resisting cover 8 on the fixed arm inner hole wall, improve telescopic machanism's life.
Claims (7)
1. A hug device, characterized in that: the brake pad comprises a brake pad and a brake pad seat, wherein the brake pad seat is of a cylindrical structure, the brake pad is coaxially fixed on the brake pad seat, the inner surface of the brake pad is a cylindrical surface, the outer surface of the front part of the brake pad is an outer conical surface with small front and large rear, the brake pad seat is arranged in front of the brake pad seat in a mounting state, the periphery of the brake pad seat is fixedly connected with cylinder rods or cylinder barrels of a plurality of piston cylinders, the plurality of piston cylinders are distributed at intervals along the circumferential direction, the expansion directions of the cylinder rods of the piston cylinders are all along the axial direction of the brake pad, the rear part of the brake pad is provided with an outer cylindrical surface, the rear part of the brake pad is fixedly embedded in the brake pad seat, a ring of radial annular table is further arranged at the rear part of the brake pad seat, the inner wall of the brake pad seat is correspondingly provided with a ring groove, the ring groove is radially embedded in the brake pad seat, the whole brake pad is uniformly provided with a plurality of circumferential notches and the same as the front and rear edges of the brake pad seat, the brake pad is provided with a plurality of radial notches, and the front and rear edges of the brake pad seat are respectively arranged at the same distance from the front and rear edges of the brake pad seat are equal to the front and the front edges of the brake pad seat are equal to the front edges of the brake pad seat.
2. The hugging device of claim 1, wherein: the brake block is formed by splicing two brake block units with arc middle parts and lug blocks at two ends, the lug blocks extend outwards along the radial direction of the arc of the middle parts, the two lug blocks between the two brake block units are attached and fixed, and the periphery of the main body of the brake block is fixedly connected with a cylinder rod or a cylinder barrel of the piston cylinder through the lug blocks.
3. The hugging device of claim 2, wherein: the piston cylinder adopts a single-action piston cylinder.
4. A hugging device as claimed in claim 3, wherein: the piston cylinder is a single-rod piston cylinder, and a disc spring is arranged in a rod cavity of the piston cylinder.
5. The hugging device of claim 4, wherein: the piston cylinder is a hydraulic cylinder.
6. The utility model provides a development machine telescopic machanism which characterized in that: the telescopic arm is in linear sliding fit with the fixed arm in the fixed arm, an axial interruption is arranged at a part, close to the axis, of the fixed arm, a part, corresponding to the axial interruption, far away from the axis is still kept as a front-back continuous whole, a section of telescopic arm is exposed at the axial interruption, the clasping device is arranged at the axial interruption and sleeved on the telescopic arm, an inner hole at the front part of the fixed arm, close to the interruption, is provided with an inner conical surface with a large outer part and a small inner part, the taper of the inner conical surface is equal to that of the outer surface at the front part of the brake pad, and a cylinder barrel or a cylinder rod of the piston cylinder is fixedly arranged relative to the fixed arm.
7. The development machine telescoping mechanism as set forth in claim 6, wherein: the cylinder rod of the piston cylinder is fixedly connected with the brake pad seat, and the cylinder barrel of the piston cylinder is fixedly connected with the fixed arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910766178.XA CN110410074B (en) | 2019-08-19 | 2019-08-19 | Enclasping device and heading machine telescopic mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910766178.XA CN110410074B (en) | 2019-08-19 | 2019-08-19 | Enclasping device and heading machine telescopic mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110410074A CN110410074A (en) | 2019-11-05 |
| CN110410074B true CN110410074B (en) | 2024-05-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910766178.XA Active CN110410074B (en) | 2019-08-19 | 2019-08-19 | Enclasping device and heading machine telescopic mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110410074B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR785161A (en) * | 1934-04-25 | 1935-08-03 | Improvements to braking devices and similar mechanisms | |
| GB1531058A (en) * | 1976-07-15 | 1978-11-01 | Draftex Dev Ag | Channel-shaped sealing finishing and guide strips |
| CN202894275U (en) * | 2012-09-29 | 2013-04-24 | 东莞亿东机器有限公司 | Internal contracting brake structure for vertical compression type die casting machine |
| CN103624054A (en) * | 2012-08-22 | 2014-03-12 | 黄广禧 | Clamping device for pressure rod of garbage cracking furnace |
| CN104405799A (en) * | 2014-11-18 | 2015-03-11 | 四川制动科技股份有限公司 | Clamp braking mechanism |
| CN104405387A (en) * | 2014-12-04 | 2015-03-11 | 天地上海采掘装备科技有限公司 | Pin-tooth-transmission arc-shaped spillplate mechanism with self-locking device |
| CN204323341U (en) * | 2014-12-16 | 2015-05-13 | 郭强 | Slip rope clamping device |
| CN208218302U (en) * | 2018-05-03 | 2018-12-11 | 天津移山工程机械有限公司 | A kind of novel band-type brake and the towing capstan with novel band-type brake |
| CN109114138A (en) * | 2018-11-09 | 2019-01-01 | 天地科技股份有限公司上海分公司 | Tunneling machine cutting pars contractilis band brake apparatus |
| DE202019101683U1 (en) * | 2019-03-25 | 2019-04-15 | Baxser Gmbh | Adjustable hydraulic disc brake |
| CN109849416A (en) * | 2018-12-29 | 2019-06-07 | 武汉新威奇科技有限公司 | The gas control disc spring brake holding mechanism of fly press class flywheel |
| CN210637069U (en) * | 2019-08-19 | 2020-05-29 | 天地科技股份有限公司上海分公司 | Holding device and heading machine telescopic mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7234782B2 (en) * | 2005-02-18 | 2007-06-26 | Sandvik Intellectual Property Ab | Tool holder block and sleeve retained therein by interference fit |
-
2019
- 2019-08-19 CN CN201910766178.XA patent/CN110410074B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR785161A (en) * | 1934-04-25 | 1935-08-03 | Improvements to braking devices and similar mechanisms | |
| GB1531058A (en) * | 1976-07-15 | 1978-11-01 | Draftex Dev Ag | Channel-shaped sealing finishing and guide strips |
| CN103624054A (en) * | 2012-08-22 | 2014-03-12 | 黄广禧 | Clamping device for pressure rod of garbage cracking furnace |
| CN202894275U (en) * | 2012-09-29 | 2013-04-24 | 东莞亿东机器有限公司 | Internal contracting brake structure for vertical compression type die casting machine |
| CN104405799A (en) * | 2014-11-18 | 2015-03-11 | 四川制动科技股份有限公司 | Clamp braking mechanism |
| CN104405387A (en) * | 2014-12-04 | 2015-03-11 | 天地上海采掘装备科技有限公司 | Pin-tooth-transmission arc-shaped spillplate mechanism with self-locking device |
| CN204323341U (en) * | 2014-12-16 | 2015-05-13 | 郭强 | Slip rope clamping device |
| CN208218302U (en) * | 2018-05-03 | 2018-12-11 | 天津移山工程机械有限公司 | A kind of novel band-type brake and the towing capstan with novel band-type brake |
| CN109114138A (en) * | 2018-11-09 | 2019-01-01 | 天地科技股份有限公司上海分公司 | Tunneling machine cutting pars contractilis band brake apparatus |
| CN109849416A (en) * | 2018-12-29 | 2019-06-07 | 武汉新威奇科技有限公司 | The gas control disc spring brake holding mechanism of fly press class flywheel |
| DE202019101683U1 (en) * | 2019-03-25 | 2019-04-15 | Baxser Gmbh | Adjustable hydraulic disc brake |
| CN210637069U (en) * | 2019-08-19 | 2020-05-29 | 天地科技股份有限公司上海分公司 | Holding device and heading machine telescopic mechanism |
Non-Patent Citations (1)
| Title |
|---|
| 一种掘进机抱紧装置和伸缩机构的设计;邵飞;;机械管理开发;20200331(第03期);41-42+147 * |
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| CN110410074A (en) | 2019-11-05 |
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