CN107160111A - A kind of copper tube production technology - Google Patents
A kind of copper tube production technology Download PDFInfo
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- CN107160111A CN107160111A CN201710487029.0A CN201710487029A CN107160111A CN 107160111 A CN107160111 A CN 107160111A CN 201710487029 A CN201710487029 A CN 201710487029A CN 107160111 A CN107160111 A CN 107160111A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
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Abstract
The invention discloses a kind of copper tube production technology, successively including following process：（1）Casting process；（2）Milling face process；（3）Rolling process；（4）Joint drawing procedure：Comprise the following steps：（41）In rolls；（42）Dried in pipe；（43）Head processed；（44）Drawing；（45）Receive basket；（5）Disk draws process；（6）Annealing operation；（7）Packaging process.The present invention has advantages below and effect：By removing the copper scale in copper pipe a ports so that copper pipe a will not be impacted in follow-up joint drawing process to copper pipe inwall；Inside in copper pipe b is dried up before head processed so that copper pipe b will not produce abnormal sound in joint drawing process；Passivating solution is added when disk is drawn, it is to avoid copper pipe d surfaces when coiled stick together.
Description
Technical field
The present invention relates to metal processing sectors, more particularly to a kind of copper tube production technology.
Background technology
At present, application publication number is CN104723023A, and data of publication of application discloses for the Chinese patent on June 24th, 2015
A kind of production technology of idle call copper pipe, its step includes founding, milling face, planetary rolling, three drawings, disk drawing, finishing, moved back
Fire, packaging and storage.
In the production technology of this air-conditioning copper pipe, during planetary rolling, copper pipe can be produced during pressure rolling system
Heat amount, can have more water on copper pipe inwall after cooling, can be produced when water, core print in copper pipe and windage altogether
Shake, so as to form abnormal sound in process.
The content of the invention
It is an object of the invention to provide a kind of copper tube production technology, by optimizing copper tube production process, so as to eliminate
Copper pipe is pulled through abnormal sound present in journey in connection.
The present invention above-mentioned technical purpose technical scheme is that：A kind of copper tube production technology,
Include following process successively：（1）Casting process：Cathode plate is added in the melting furnace of casting machine, then will be formed after fusing
Copper water be injected into the holding furnace of casting machine and be incubated, be molded eventually through the crystallizer of casting machine and obtain copper pipe a；（2）
Milling face process：First pass through hauling machine the copper pipe a of formation is drawn on skin-milling machine, then cut off copper pipe a by sawing machine, finally
It is by skin-milling machine that the oxide skin milling on copper pipe a surfaces is net；（3）Rolling process：Core print is put into copper pipe a, push-in is rolled in planet
Rolled in machine, prepare copper pipe b；（4）Joint drawing procedure：Comprise the following steps：（41）In rolls：Copper pipe b is first transmitted across
First cutting machine, then carried out by lapper in rolls, while also being cut by the first cutting machine to copper pipe b afterbody；
（42）Dried in pipe：First pass through the gas blow pipe of air pump and connection on air pump to extend into copper pipe b afterbody, to copper pipe b's
Inwall is blown so that copper pipe b inwall is dried bearing of trend of the air-flow along copper pipe b, and drying time is 5-10
Minute；（43）Head processed：First again toward being put into core print and drawing oil in copper pipe b afterbody, then by the first head machine processed to copper pipe b progress
Head processed；（44）Drawing：Drawing is carried out to copper pipe b by joint drawing unit, copper pipe c is obtained；（45）Receive basket；（5）Disk draws process：
Disk drawing is carried out to copper pipe c by tubing rewinding machine, coiled copper pipe d is obtained, then carry out receipts basket；（6）Annealing operation：It will receive after basket
Copper pipe d be sent in annealing furnace and annealed；（7）Packaging process：Packed after the examination and test of products is qualified.
By using such scheme, during copper pipe b being processed into by a by rolling, copper pipe b meeting heating, when
After hot-air cooling in copper pipe b, condensed water is formed on copper pipe b inwall, so including in the step of joint drawing
The step dried in pipe, by the way that the gas blow pipe being connected with blower pump is extend into copper pipe b, to carrying out 5-10 points in copper pipe b
The time of clock is blown, so that the condensate evaporation inside copper pipe, is finally carried out by combining drawbench to copper pipe b
During drawing, abnormal sound will not be produced, it is to avoid water, core print and air in pipe produce resonance, so as to avoid causing during resonance
Drawing oil adds the frictional force between copper pipe b inwalls and core print away from core print, causes copper pipe b inwalls to be rubbed by larger
The abrasion caused when wiping power.
The further setting of the present invention is：In step（2）In, in addition to cleaning：When copper pipe a is cut off by sawing machine
Afterwards, the Air blowing stick being connected with air pump is stretched into copper pipe a from the copper pipe a end faces for being cut end so that blown out from Air blowing stick
Airflow direction in contrast to the direction stretched into copper pipe a of Air blowing stick, the copper scale and coolant in copper pipe a are cleared up.
By using such scheme, it is cut by the way that the Air blowing stick being connected with air pump is stretched into copper pipe a in amount end face,
Cause on Air blowing stick that the airflow direction that blows out meets the direction that Air blowing stick is stretched into copper pipe a simultaneously so that sawing machine cutting copper pipe a
When the copper scale that is attached on copper pipe a inwalls can be insufflated rod blowout；If not removing copper scale, copper scale in copper pipe a with
In the process for copper pipe a, copper scale would also adhere to copper pipe b inwall, it is to avoid copper pipe is carried out by joint drawing unit
During drawing, the copper scale in copper pipe b can be supported between core print and copper pipe b inwall, so that the drawing to copper pipe b is impacted, made
The inwall for obtaining copper pipe b causes cut and abrasion etc..
The further setting of the present invention is：In step（2）In, in addition to waste recovery step：In skin-milling machine by copper pipe a tables
When the oxide skin milling in face is net, the copper scale of generation is collected into collecting vessel, filter bores are opened up in the bottom of collecting vessel to filter
Fall the coolant entered together in collecting vessel with copper scale, the copper scale after collection is carried out to dry by dryer, so
It is pressed into deliver in melting furnace again after copper cake by press afterwards and is recycled.
By using such scheme, after by skin-milling machine, the oxide skin on copper pipe a is removed, oxide skin forms substantial amounts of
Copper scale, in order to economize on resources, by being recycled after the copper scale of collection is dried, at that time because of the meeting when skin-milling machine is in processing
Coolant is added, so substantial amounts of coolant is stained with copper scale, so that dry efficiency is influenced whether, by collecting box
Bottom open up filter bores so that coolant is discharged from the bottom wall of collecting vessel, so as to increase the drying efficiency of copper scale, is subtracted
Energy resource consumption when dryer is used for a long time is lacked.
The further setting of the present invention is：In step（44）In, comprise the following steps：（a）Drawing：Pass through joint drawing
First drawbench of unit carries out drawing to copper pipe b；（b）Washing：The copper pipe b after drawing is carried out by the first rinsing machine
Washing；（c）Dry：The water on copper pipe is removed by air compressor；（d）Head processed：Core print and drawing oil are added to copper pipe b
It is interior, head processed is carried out by the second head machine processed；（e）Drawing：By the second drawbench of Unit erriger to the copper pipe b after drawing
Copper pipe c is obtained after carrying out drawing；（f）Washing：Copper pipe c is washed by the second rinsing machine.
By using such scheme, during drawing is carried out to copper pipe b by the first drawbench, because copper pipe b is logical
Drawing can be carried out after crossing the mould on the first drawbench and the cooperation of the core print in copper pipe b, so can be in copper pipe b
Interior addition drawing oil is lubricated, while can be also lubricated to copper pipe b outer wall addition lubricating oil, so copper pipe b's is outer
There can be some impurity on wall, be removed impurity by water-washing step；Joint drawing unit is by drawing twice, institute simultaneously
With by the first drawbench carry out drawing after, it is necessary to which the water on the copper pipe b after washing is dried, it is to avoid copper pipe exists
During by the second drawbench drawing, cause lubricating oil to stick on copper pipe b because copper pipe b surfaces have moisture, cause copper
Frictional force between mould on pipe b and the second drawbench becomes big, causes copper pipe b surface abrasions.
The further setting of the present invention is：In step（c）And step（d）Between, in addition to step（c1）Length compensation：
Reserved 5-10 meters spacing, is put between the air compressor and the second head machine processed between air compressor and the second head machine processed
The transmission frame shelved for the copper pipe b lower surfaces after first time drawing, is bonded with the upper surface of transmission frame under copper pipe
The rubber blanket that end face is contradicted.
By using such scheme, then when carrying out drawing to copper pipe b by joint drawing unit so that copper pipe b is first passed through
First drawbench, rinsing machine and air compressor, when copper pipe b is entered close to the second drawbench, then to passing through first
Copper pipe b after drawing carries out head processed, and drawing is carried out finally by the second drawbench；Now copper pipe b is equivalent to passing through the first drawing
Machine and the drawing simultaneously of the second drawbench, when the transmission rate of the first drawbench is more than the transmission rate of the second drawbench, in warp
The copper pipe b crossed between air compressor and the second head machine processed can be sagging, is rubbed so as to touch on ground with ground, so
By on the rubber blanket on transmission frame and transmission frame so that copper pipe b can be erected on rubber blanket without sagging upon bending, be kept away
Exempt to contact and wear and tear with ground.
The further setting of the present invention is：In step（f）Afterwards, in addition to step（f1）Cutting：By cutter to copper pipe c
Before being cut off, while frame is welded and fixed on cutter, the rubber that embedded internal diameter and copper pipe c external diameters match on fixed mount
Circle so that copper pipe c passes through rubber ring, rubber ring is wiped the impurity and moisture on copper pipe c outer walls.
By using such scheme, cutter can be sheared to copper pipe c, while the rubber ring on cutter
It can wipe sticking to moisture and lubricating oil on copper pipe c outer walls etc. so that copper pipe c surfaces have good gloss
Degree.
The further setting of the present invention is：In step（5）In, the copper pipe d surface instillation passivating solutions after drawing disk, by copper
Pipe d is rolled into coiled copper pipe d.
By using such scheme, when siphunculus material rewinding machine carries out disk drawing to copper pipe c, obtained copper pipe d surfaces can be produced
Heat amount, when copper pipe d is coiled, copper pipe b outer wall can sometimes stick together, so as to influence copper pipe d surface property；Copper
Pipe in copper pipe surface by adding passivating solution, the product that it is in passive state for metal surface that passivating solution, which is, in coating surface formation energy
The surface state of metal oxidation reaction is prevented, so as to avoid copper pipe d from being adhered to each other in coiling.
The further setting of the present invention is：In step（41）In, in addition to the thick embryo production process of copper pipe：In the machine of lapper
Multiple guide wheels and guide groove be set on frame, and copper pipe b transmission direction is deviateed in the direction of directive wheel and guide groove so that cut from first
Cutting mill uploads out copper pipe b and is transmitted by guide wheel and guide groove, then directly copper pipe b is cut by the second cutting machine,
Form the thick embryo of copper pipe.
By using such scheme, in the thick embryo of customer requirement production copper pipe, the copper pipe b after rolling is directly passed through second
Cutting machine is cut and obtains the thick embryo of copper pipe, because the production line of original copper pipe is longer, is caused in the first cutting machine and lapper
The distance between it is relatively short so that the thick embryo of the copper pipe that can not obtain sufficient length is cut, so that copper pipe b is by leading
To wheel and guide groove so that copper pipe b is cut after deviateing the direction originally transmitted by the second cutting machine.
In summary, the invention has the advantages that：By removing the copper scale in copper pipe a ports so that copper pipe a exists
In follow-up joint drawing process, copper pipe inwall will not be impacted；Inside in copper pipe b is dried up before head processed so that
Copper pipe b will not produce abnormal sound in joint drawing process；Passivating solution is added when disk is drawn, it is to avoid copper pipe d glues on the surface when coiled
Together.
Embodiment
A kind of copper tube production technology, including following process：（1）Casting process；（2）Milling face；（3）Rolling process；
（4）Joint drawing procedure；（5）Disk draws process；（6）Annealing operation；（7）Packaging process.
In step（1）In founder, first cathode plate is added in the melting furnace of casting machine, then will be formed after fusing
Copper water is injected into the holding furnace of casting machine and is incubated, and copper pipe a is obtained eventually through the crystallizer shaping of casting machine.
In step（2）In the process of milling face, first pass through hauling machine and the copper pipe a of formation is drawn on skin-milling machine, then pass through saw
Machine is cut to cut off copper pipe a；Cleaning is carried out again：The Air blowing stick being connected with air pump is stretched from the copper pipe a end faces for being cut end
Enter in copper pipe a so that the airflow direction blown out from Air blowing stick in contrast to the direction stretched into copper pipe a of Air blowing stick, to copper pipe a
Interior copper scale and coolant is cleared up；Finally net to the oxide skin progress milling on copper pipe a surfaces by skin-milling machine.Simultaneously right
After oxide skin progress milling is net, in addition to waste recovery step：It is collected into by the copper scale of generation in collecting vessel, while in collecting vessel
Bottom open up filter bores and be used to filter out the coolant that enters together in collecting vessel with copper scale, the copper scale after collection is entered
Row is dried by dryer, because being filtered between drying to coolant, so drying machine drying can be reduced
Time so that time when reducing drying machine drying copper scale, dryer is reduced by saving the drying time of dryer
Energy resource consumption, then is pressed into deliver in melting furnace again after copper cake and is recycled by press.
In step（3）In rolling process, core print is put into copper pipe a, push-in is rolled in planetary rolling, prepared
Copper pipe b.
In step（4）In joint drawing procedure, comprise the following steps：（41）In rolls：Copper pipe b is first transmitted across the first cutting
Machine, then carried out by lapper in rolls, while also being cut by the first cutting machine to copper pipe b afterbody；（42）It is dry in pipe
It is dry：First pass through the gas blow pipe of air pump and connection on air pump to extend into copper pipe b afterbody, copper pipe b inwall is blown
Gas so that copper pipe b inwall is dried bearing of trend of the air-flow along copper pipe b, drying time is 5-10 minutes；（43）System
Head：First again toward being put into core print and drawing oil in copper pipe b afterbody, then by the first head machine processed to copper pipe b progress head processed；（44）Draw
Pull out：Drawing is carried out to copper pipe b by joint drawing unit, copper pipe c is obtained；（45）Receive basket.
In step（44）In drawing, comprise the following steps：（a）Drawing：Pass through the first drawbench pair of joint drawing unit
Copper pipe b carries out drawing；（b）Washing：The copper pipe b after drawing is washed by the first rinsing machine, so as to remove first
Drawbench pours the lubricating oil on copper pipe b surfaces in processing；（c）Dry：In order to avoid copper pipe b surfaces have moisture, and lead
It is to first pass through air compressor in the form of jet by copper to cause to be difficult to pour lubricating oil on copper pipe b surfaces at the second drawbench
Water drying on pipe, while after washing, also may be such that copper pipe b initially passes through a rubber blanket, passing through rubber blanket and copper pipe surface
Contradict, first most moisture is removed, finally the water of the residual on copper pipe is dried up by air compressor；Step
（c1）Length compensation：5-10 meters of spacing is reserved between air compressor and the second head machine processed, in the air compressor and the
The transmission frame shelved for the copper pipe b lower surfaces after first time drawing is put between two head machines processed, in the upper end of transmission frame
Face is bonded with the rubber blanket contradicted for copper pipe lower surface；（d）Head processed：Core print and drawing oil are added in copper pipe b, pass through second
Head machine processed carries out head processed；（e）Drawing：The copper pipe b after drawing is carried out after drawing by the second drawbench of Unit erriger
Obtain copper pipe c；（f）Washing：Copper pipe c is washed by the second rinsing machine；（f1）Cutting：Copper pipe c is entered by cutter
Before row cut-out, while frame is welded and fixed on cutter, the rubber ring that embedded internal diameter and copper pipe c external diameters match on fixed mount,
So that copper pipe c passes through rubber ring, rubber ring is wiped the impurity and moisture on copper pipe c outer walls.
In step（5）Disk is drawn in process, and disk drawing is carried out to copper pipe c by tubing rewinding machine, the copper pipe d surfaces after disk drawing
Instillation passivating solution, then copper pipe d is wound, coiled copper pipe d is obtained, then carry out receipts basket.
In step（6）In annealing operation, the copper pipe d received after basket is sent in annealing furnace and annealed.
In step（7）In packaging process, product is tested, it is qualified to the examination and test of products to pack afterwards.
Also include the thick embryo production process of another copper pipe：Including what is above described（1）Casting process；（2）Milling face process；
（3）Rolling process, then in step（41）In, first multiple guide wheels and guide groove be set in the frame of lapper, directive wheel and
The bearing of trend of guide groove deviates the original transmission directions of copper pipe b so that from the first cutting machine upload out copper pipe b by guide wheel and
Guide groove is transmitted, final to cause copper pipe b to deviate original transmission direction, then directly copper pipe b is entered by the second cutting machine
Row cutting, obtains the thick embryo of copper pipe.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification without creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Claims (8)
1. a kind of copper tube production technology, it is characterised in that：Include following process successively：
（1）Casting process：Cathode plate is added in the melting furnace of casting machine, then the copper water formed after fusing is injected into casting
It is incubated in the holding furnace for making machine, copper pipe a is obtained eventually through the crystallizer shaping of casting machine；
（2）Milling face process：First pass through hauling machine the copper pipe a of formation is drawn on skin-milling machine, then cut copper pipe a by sawing machine
It is disconnected, it is finally by skin-milling machine that the oxide skin milling on copper pipe a surfaces is net；
（3）Rolling process：Core print is put into copper pipe a, push-in is rolled in planetary rolling, prepares copper pipe b；
（4）Joint drawing procedure：Comprise the following steps：（41）In rolls：Copper pipe b is first transmitted across the first cutting machine, then by coiled
Machine is carried out in rolls, while also being cut by the first cutting machine to copper pipe b afterbody；（42）Dried in pipe：First pass through air pump
And gas blow pipe of the connection on air pump is extend into copper pipe b afterbody, copper pipe b inwall is blown so that air-flow edge
Copper pipe b inwall is dried the bearing of trend for copper pipe b, and drying time is 5-10 minutes；（43）Head processed：First again toward copper pipe
Core print and drawing oil are put into b afterbody, then head processed is carried out to copper pipe b by the first head machine processed；（44）Drawing：Drawn by combining
Drawing machine group carries out drawing to copper pipe b, obtains copper pipe c；（45）Receive basket；
（5）Disk draws process：Disk drawing is carried out to copper pipe c by tubing rewinding machine, coiled copper pipe d is obtained, then carry out receipts basket；
（6）Annealing operation：The copper pipe d received after basket is sent in annealing furnace and annealed；
（7）Packaging process：Packed after the examination and test of products is qualified.
2. a kind of copper tube production technology according to claim 1, it is characterised in that：In step（2）In, in addition to cleaning
Step：After copper pipe a is cut off by sawing machine, the Air blowing stick being connected with air pump is stretched into from the copper pipe a end faces for being cut end
In copper pipe a so that the airflow direction blown out from Air blowing stick in contrast to the direction stretched into copper pipe a of Air blowing stick, in copper pipe a
Copper scale and coolant cleared up.
3. a kind of copper tube production technology according to claim 1, it is characterised in that：In step（2）In, in addition to waste material
Recycling step：When skin-milling machine is net by the oxide skin milling on copper pipe a surfaces, the copper scale of generation is collected into collecting vessel, collected
The bottom of bucket opens up filter bores to filter out the coolant entered together in collecting vessel with copper scale, to the copper scale after collection
Progress is dried by dryer, then is pressed into deliver in melting furnace again after copper cake by press and is recycled.
4. a kind of copper tube production technology according to claim 1, it is characterised in that：In step（44）In, including it is following
Step：（a）Drawing：Drawing is carried out to copper pipe b by the first drawbench of joint drawing unit；（b）Washing：Pass through the first washing
Machine is washed to the copper pipe b after drawing；（c）Dry：The water on copper pipe is removed by air compressor；（d）Head processed：
Core print and drawing oil are added in copper pipe b, head processed is carried out by the second head machine processed；（e）Drawing：Pass through the second of Unit erriger
Drawbench obtains copper pipe c after carrying out drawing to the copper pipe b after drawing；（f）Washing：Copper pipe c is entered by the second rinsing machine
Water-filling is washed.
5. a kind of copper tube production technology according to claim 4, it is characterised in that：In step（c）And step（d）It
Between, in addition to step（c1）Length compensation：The reserved 5-10 meters spacing between air compressor and the second head machine processed, in the sky
The transmission frame shelved for the copper pipe b lower surfaces after first time drawing is put between air compressor and the second head machine processed,
The upper surface of transmission frame is bonded with the rubber blanket contradicted for copper pipe lower surface.
6. a kind of copper tube production technology according to claim 5, it is characterised in that：In step（f）Afterwards, in addition to step
（f1）Cutting：Before being cut off by cutter to copper pipe c, while frame is welded and fixed on cutter, it is embedded on fixed mount
The rubber ring that internal diameter and copper pipe c external diameters match so that copper pipe c passes through rubber ring, and rubber ring is to the impurity and water on copper pipe c outer walls
Divide and wiped.
7. a kind of copper tube production technology according to claim 1, it is characterised in that：In step（5）In, after drawing disk
Copper pipe d surface instillation passivating solutions, copper pipe d are being rolled into coiled copper pipe d.
8. a kind of copper tube production technology according to claim 1, it is characterised in that：In step（41）In, in addition to copper
Manage thick embryo production process：Multiple guide wheels and guide groove, the direction deviation of directive wheel and guide groove are set in the frame of lapper
Copper pipe b transmission direction so that upload out copper pipe b from the first cutting machine and be transmitted by guide wheel and guide groove, then pass through the
Two cutting machines are directly cut to copper pipe b, form the thick embryo of copper pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710487029.0A CN107160111B (en) | 2017-06-23 | 2017-06-23 | A kind of copper tube production technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710487029.0A CN107160111B (en) | 2017-06-23 | 2017-06-23 | A kind of copper tube production technology |
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| CN107160111B CN107160111B (en) | 2019-04-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108000073A (en) * | 2017-12-28 | 2018-05-08 | 无锡市欣明换热新材料科技有限公司 | A kind of processing method of the condenser pipe of condenser |
| CN108673059A (en) * | 2018-04-27 | 2018-10-19 | 海亮（安徽）铜业有限公司 | A kind of moulding process of efficient copper tube |
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| CN103639214A (en) * | 2013-11-28 | 2014-03-19 | 青岛蓝图文化传播有限公司市南分公司 | Coil drawing process of red copper tube for air conditioner |
| CN104607882A (en) * | 2015-02-08 | 2015-05-13 | 浙江同诚合金铜管有限公司 | Pickling-free manufacturing method for copper alloy pipe with cast rolling method |
| CN104723023A (en) * | 2013-12-20 | 2015-06-24 | 青岛蓝图文化传播有限公司市南分公司 | Machining process of copper pipe for ultrathin-walled air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6899600B1 (en) * | 2004-03-03 | 2005-05-31 | Chin-Ching Hsien | Wrench manufacturing process |
| CN102829657A (en) * | 2012-08-16 | 2012-12-19 | 江苏仓环铜业股份有限公司 | High temperature resistant sintered heat tube and producing method thereof |
| CN103639214A (en) * | 2013-11-28 | 2014-03-19 | 青岛蓝图文化传播有限公司市南分公司 | Coil drawing process of red copper tube for air conditioner |
| CN104723023A (en) * | 2013-12-20 | 2015-06-24 | 青岛蓝图文化传播有限公司市南分公司 | Machining process of copper pipe for ultrathin-walled air conditioner |
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| CN108673059A (en) * | 2018-04-27 | 2018-10-19 | 海亮（安徽）铜业有限公司 | A kind of moulding process of efficient copper tube |
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| Publication number | Publication date |
|---|---|
| CN107160111B (en) | 2019-04-19 |
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