CN108044300A - A kind of processing method of process tool and oil cylinder - Google Patents
A kind of processing method of process tool and oil cylinder Download PDFInfo
- Publication number
- CN108044300A CN108044300A CN201710991538.7A CN201710991538A CN108044300A CN 108044300 A CN108044300 A CN 108044300A CN 201710991538 A CN201710991538 A CN 201710991538A CN 108044300 A CN108044300 A CN 108044300A
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- process tool
- knife
- processing method
- blank
- cylinder
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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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- 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
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/02—Machine tools for performing different machining operations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Drilling And Boring (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention discloses the processing methods of a kind of process tool and oil cylinder, belong to field of machining.Process tool includes：Knife rest, the first sharp knife, the second sharp knife, the 3rd sharp knife, floating boring cutter and multiple locating pieces, first sharp knife, the second sharp knife, the 3rd sharp knife and floating boring cutter are removably mounted on along the axially spaced-apart of knife rest on central shaft, each locating piece is using the center line of knife rest as the circumferentially-spaced arrangement of axis, the bottom of each locating piece is radially slideably inserted on the periphery wall of knife rest along knife rest, inclined-plane is equipped at the top of each locating piece, inclined-plane arranges that the top of locating piece is used to offset with the internal perisporium of oil cylinder towards floating boring cutter.The present invention solves the problems, such as that the endoporus straightness of oil cylinder can not be guaranteed.
Description
Technical field
The invention belongs to field of machining, the processing method of more particularly to a kind of process tool and oil cylinder.
Background technology
Oil cylinder is a kind of common Hydraulic Elements, mainly includes cylinder body and piston rod, and cylinder body is interior along the side of its center line
To equipped with endoporus (plunger shaft), piston rod is slidably disposed in endoporus.
For the longer oil cylinder of length, during processing, the direct of travel of process tool is easy to endoporus
There is deviation, the straightness of endoporus would become hard to be guaranteed, and the processing yield for causing oil cylinder is relatively low.
The content of the invention
In order to which the endoporus straightness for solving the problems, such as oil cylinder can not be guaranteed, an embodiment of the present invention provides a kind of processing
The processing method of cutter and oil cylinder.The technical solution is as follows：
On the one hand, an embodiment of the present invention provides a kind of process tool, the process tool includes：Knife rest, the first sharp knife,
Second sharp knife, the 3rd sharp knife, floating boring cutter and multiple locating pieces, first sharp knife, second sharp knife, the 3rd sharp knife and
The floating boring cutter is removably mounted on along the axially spaced-apart of the knife rest on the central shaft, and each locating piece is with described
The center line of knife rest is the circumferentially-spaced arrangement of axis, and the bottom of each locating piece is radially slideably inserted along the knife rest
On the periphery wall of the knife rest, inclined-plane is equipped at the top of each locating piece, the inclined-plane is towards the floating boring cutter cloth
It puts, the top of the locating piece is used to offset with the internal perisporium of oil cylinder.
In a kind of realization method of the present invention, the locating piece is wood structural members.
On the other hand, an embodiment of the present invention provides a kind of processing method of oil cylinder, the processing method includes：
Cylinder blank and bottom cover blank are provided；
Cylinder inner bore is processed on the cylinder blank, and welding groove is processed in one end of the cylinder inner bore；
Bottom cover blind hole is processed on the bottom cover blank, and welding slope is processed in the opening of the bottom cover blind hole
Mouthful；
The cylinder blank and the end cap blank are welded together by two welding grooves；
Process tool is provided, the process tool is process tool described in claim 1；
It is processed in the other end of the cylinder inner bore and draws hole；
First sharp knife, the second sharp knife, the 3rd sharp knife, floating boring cutter and locating piece on the knife rest are installed, added by described
Draw hole described in work tool sharpening, to obtain first stage endoporus；
The process tool is exited into the first stage endoporus, dismantles second sharp knife, the 3rd sharp knife and institute
Floating boring cutter is stated, and adjusts first sharp knife, to increase the length that first sharp knife stretches out the knife rest；
The first stage endoporus is processed by the process tool, to obtain the second stage endoporus；
The process tool is exited into the second stage endoporus, adjusts first sharp knife, to increase first point
Knife stretches out the length of the knife rest；
The second stage endoporus is processed by the process tool, to obtain shaping endoporus.
Further, the processing method includes：Escape is processed in one end of the separate opening of the bottom cover blind hole.
Further, the processing method includes：Before two welding grooves are welded, respectively in two welderings
It connects and installation seam allowance is processed on groove.
Further, the fit clearance between two installation seam allowances is 0.06mm~0.20mm.
Further, the processing method includes：After two welding grooves are welded, in the cylinder blank
The frame position for cylinder blank described in clamping is processed on other end periphery wall, the frame position is with the center line of the cylinder blank
For axis circumferentially.
Further, the processing method includes：After two welding grooves are welded, in the cylinder blank
Process correction tape on other end periphery wall, the correction tape using the center line of the cylinder blank as axis circumferentially, and institute
Correction tape is stated to be located between the other end and the frame position of the cylinder blank.
Further, the processing method includes：When the process tool marches to the cylinder blank and the bottom cover
During weld between blank, the feed speed of the process tool is reduced.
Further, the processing method includes：During the process tool is advanced, institute is washed away using coolant
State the inside of cylinder blank and the bottom cover.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
By setting locating piece on the periphery wall of knife rest, when process tool enters the endoporus of cylinder body, each locating piece top
The inclined-plane in portion offsets with the opening of endoporus, with the traveling of process tool, inclined-plane is opposite with the opening of endoporus slide under,
The periphery wall of knife rest is gradually goed deep into the bottom of each locating piece, until locating piece enters endoporus, and the top of locating piece and endoporus
Internal perisporium offsets, and deviation occurs so as to avoid the direct of travel of process tool, so that the straightness of endoporus is protected
Card improves the processing yield of oil cylinder.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structure diagram of process tool provided in an embodiment of the present invention；
Fig. 2 is the side view of process tool provided in an embodiment of the present invention；
Fig. 3 is the flow chart of processing method provided in an embodiment of the present invention；
Fig. 4 is the structure diagram of cylinder blank provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of bottom cover blank provided in an embodiment of the present invention；
Fig. 6 is the welding schematic diagram of cylinder blank and bottom cover blank provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of the oil cylinder of machine-shaping provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
An embodiment of the present invention provides a kind of process tool, which is used to process the endoporus (plunger shaft) of oil cylinder,
As shown in Figure 1, the process tool includes：Knife rest 1, the first sharp knife 21, the second sharp knife 22, the 3rd sharp knife 23, floating boring cutter 3 and multiple
Locating piece 4, during the first sharp knife 21, the second sharp knife 22, the 3rd sharp knife 23 and floating boring cutter 3 are mounted on along the axially spaced-apart of knife rest 1
In mandrel, each locating piece 4 using the center line of knife rest 1 be axis it is circumferentially-spaced arrangement (referring to Fig. 2), the bottom of each locating piece 4 is equal
It is radially slideably inserted on the periphery wall of knife rest 1 along knife rest 1, the top of each locating piece 4 is equipped with inclined-plane, inclined-plane direction
Floating boring cutter 3 arranges that the top of locating piece 4 is used to offset with the internal perisporium of oil cylinder.
In above-mentioned realization method, two floating boring cutters 3 can be set on knife rest 1, and two floating boring cutters 3 are in knife rest 1
Heart line is axial symmetry arrangement, so as to further ensure the straightness of endoporus that process tool processed.
Preferably, locating piece 4 is wood structural members, and the internal perisporium of oil cylinder is caused to damage so as to avoid locating piece 4.
More electedly, the top of locating piece 4 can be arc-shaped towards the position of the internal perisporium of oil cylinder, so that positioning
Block 4 can be preferably with oil cylinder internal perisporium offset.
By setting locating piece 4, when process tool enters the endoporus of cylinder body, each locating piece 4 on the periphery wall of knife rest 1
The inclined-plane at top offsets with the opening of endoporus, with the traveling of process tool, in inclined-plane slip opposite with the opening of endoporus
Under, the periphery wall of knife rest 1 is gradually goed deep into the bottom of each locating piece 4, until locating piece 4 is into endoporus, and the top of locating piece 4 with
The internal perisporium of endoporus offsets, and deviation occurs so as to avoid the direct of travel of process tool, so that the straightness of endoporus obtains
Guarantee has been arrived, has improved the processing yield of oil cylinder.
An embodiment of the present invention provides a kind of processing methods of oil cylinder, and referring to Fig. 3, this method is used for by shown in Fig. 1
Process tool processing oil cylinder, this method includes：
Step 101：Cylinder blank and bottom cover blank are provided.
Step 102：Cylinder inner bore is processed on cylinder blank, and welding groove 51 is processed in one end of cylinder inner bore
(referring to Fig. 4).
In this way, can be in subsequent step 106, bottom cover blank and cylinder blank to be welded together and are ready work.
In above-mentioned realization method, cylinder inner bore can be completed by roughing, to improve the efficiency of oil cylinder processing.
Step 103：Bottom cover blind hole is processed on bottom cover blank, and welding groove is processed in the opening of bottom cover blind hole
61, the welding groove 51 on cylinder blank matches (referring to Fig. 5) with the welding groove 61 on bottom cover blank.
In this way, can be in subsequent step 106, bottom cover blank and cylinder blank to be welded together and are ready work.
In above-mentioned realization method, bottom cover blind hole again may be by roughing completion, to improve the efficiency of oil cylinder processing.
Step 104：Escape 62 is processed in one end of the separate opening of bottom cover blind hole (referring to Fig. 5).
In above-mentioned realization method, escape 62 is used in subsequent job step, the withdrawing of process tool.
Step 105：Installation seam allowance is processed on two welding grooves respectively, seam allowances are installed by cylinder blank by two
Together with being co-axially mounted with bottom cover blank.
Specifically, installation seam allowance 52 is processed at the welding groove 51 of cylinder blank, in the welding groove of bottom cover blank
Installation seam allowance 63 is processed at 61, in assembling, the internal perisporium of the installation seam allowance 51 on cylinder blank and the peace on bottom cover blank
The periphery wall of dress seam allowance 63 matches, so that can be co-axially mounted together between cylinder inner bore and bottom cover endoporus.
It should be noted that the installation seam allowance 52 on cylinder blank can be on cylinder blank be processed welding groove 51
Be processed further obtaining afterwards, the welding groove 61 that the installation seam allowance 63 on bottom cover blank can be on bottom cover blank be processed it
After be processed further obtaining.
Preferably, the fit clearance between two installation seam allowances is 0.06mm~0.20mm.
In such manner, it is possible to convenient for the assembling between two installation seam allowances.
Step 106：Cylinder blank and end cap blank are welded on one by the welding groove of cylinder blank and bottom cover blank
It rises (referring to Fig. 6).
So so that cylinder blank and bottom cover blank become an entirety, in order in subsequent step to plunger shaft into
Row overall processing.
Step 107：Process the frame position for clamping cylinder blank on the other end periphery wall of cylinder blank, frame position with
The center line of cylinder blank for axis circumferentially.
In above-mentioned realization method, due to welding cylinder blank and during bottom cover blank, cylinder blank and bottom cover blank
Outer wall inevitably generates welding deformation, if the outer wall of the direct clamping cylinder blank of the centre frame of lathe, will be unable to protect
The accuracy of following process is demonstrate,proved, so needing on the outer wall of cylinder blank, using the center line of cylinder blank as axis, is re-worked
Go out the frame position for clamping.
Preferably, frame position can be annular, in order to the centre frame clamping of lathe.
Step 108：Correction tape is processed on the other end periphery wall of cylinder blank, correction tape is with the center of cylinder blank
For axis circumferentially, and correction tape is located between the other end of cylinder blank and frame position line.
In above-mentioned realization method, since the center line of correction tape and cylinder blank is coaxially arranged, it is possible to follow-up
In procedure of processing, detect whether machining accuracy meets the requirements by correction tape.
Step 109：Process tool is provided, process tool is the process tool shown in Fig. 1.The structure of process tool is preceding
By the agency of in text, this will not be repeated here.
Step 110：It is processed in the other end of cylinder inner bore and draws hole.
In this example, it is assumed that the hole depth D1 of cylinder inner bore is 1925mm (referring to Fig. 4), the oil cylinder after machine-shaping
The internal diameter R of plunger shaft is 356mm, and the hole depth D2 of plunger shaft is 2015mm (referring to Fig. 7).
Specifically, step 110 can be realized by following steps：
First, the first sharp knife is installed on knife rest so that (processing diameter refers to a diameter of 355.7mm of processing of process tool
Be aperture that process tool can process at work), process in the other end of cylinder inner bore by process tool
One stage drew hole, and the first stage draws the internal diameter in hole for 355.7mm, and the hole depth that the first stage draws hole is 400mm.
Then, process tool is exited into the first stage and draws hole, dismantle the first sharp knife, and floating boring cutter and locating piece are installed, made
The processing diameter of process tool is adjusted to 356mm, draw hole machined in the first stage by process tool and go out second stage and draw hole,
Second stage draws the internal diameter in hole for 356mm, and the hole depth that second stage draws hole is 400mm.
Due to being equipped with locating piece on knife rest, so the straightness that second stage draws hole can be guaranteed.
It should be noted that it is to draw hole in step 110 that second stage, which draws hole,.
Step 111：First sharp knife, the second sharp knife, the 3rd sharp knife, floating boring cutter and locating piece are installed on knife rest, by adding
Work tool sharpening draws hole, to obtain first stage endoporus.
During specific implementation, the first sharp knife processes a diameter of 342.5mm, a diameter of 349mm of the processing of the second sharp knife, the 3rd
The a diameter of 356mm of processing of sharp knife.
Preferably, when process tool marches to the weld between cylinder blank and bottom cover blank, process tool is reduced
Feed speed.
This way it is possible to avoid the overlap of weld is forged a knife.
In the present embodiment, the feeding speed of process tool can when the working depth of process tool is to 1900mm, be reduced
Degree, is then reprocessed to 1990mm.
Due to being equipped with locating piece on knife rest, so the straightness of first stage endoporus can be guaranteed.
Step 112：Process tool is exited into first stage endoporus, the second sharp knife of dismounting, the 3rd sharp knife and floating boring cutter, and is adjusted
Whole first sharp knife, to increase the length that the first sharp knife stretches out knife rest.
During specific implementation, the processing diameter of the first sharp knife is adjusted to 349mm.
Step 113：First stage endoporus is processed by process tool, to obtain second stage endoporus.
In above-mentioned realization method, processing second stage endoporus is used to remove the foot in first stage endoporus.
Preferably, when process tool marches to the weld between cylinder blank and bottom cover blank, process tool is reduced
Feed speed.
This way it is possible to avoid the overlap of weld is forged a knife.
In the present embodiment, the feeding speed of process tool can when the working depth of process tool is to 1900mm, be reduced
Degree, is then reprocessed to 1990mm.
Step 114：Process tool is exited into second stage endoporus, adjusts the first sharp knife, stretches out knife to increase the first sharp knife
The length of frame.
During specific implementation, the processing diameter of the first sharp knife is adjusted to 356mm.
Step 115：Second stage endoporus is processed by process tool, to obtain shaping endoporus (Fig. 7).
In this way, it can further remove the foot in second stage endoporus.
Preferably, when process tool marches to the weld between cylinder blank and bottom cover blank, process tool is reduced
Feed speed.
This way it is possible to avoid the overlap of weld is forged a knife.
In the present embodiment, the feeding speed of process tool can when the working depth of process tool is to 1900mm, be reduced
Degree, is then reprocessed to 1990mm.
Preferably, during process tool is advanced, coolant can be utilized to wash away the inside of cylinder blank and bottom cover.
In this way, the iron filings for processing generation can be gone out.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of process tool, which is characterized in that the process tool includes：Knife rest, the first sharp knife, the second sharp knife, tricuspid
Knife, floating boring cutter and multiple locating pieces, first sharp knife, second sharp knife, the 3rd sharp knife and the equal edge of floating boring cutter
The axially spaced-apart of the knife rest is removably mounted on the central shaft, each locating piece using the center line of the knife rest as
The circumferentially-spaced arrangement of axis, the bottom of each locating piece are radially slideably inserted into the outer of the knife rest along the knife rest
On peripheral wall, inclined-plane is equipped at the top of each locating piece, the inclined-plane is arranged towards the floating boring cutter, the locating piece
Top is used to offset with the internal perisporium of oil cylinder.
2. process tool according to claim 1, which is characterized in that the locating piece is wood structural members.
3. a kind of processing method of oil cylinder, which is characterized in that the processing method includes：
Cylinder blank and bottom cover blank are provided；
Cylinder inner bore is processed on the cylinder blank, and welding groove is processed in one end of the cylinder inner bore；
Bottom cover blind hole is processed on the bottom cover blank, and welding groove is processed in the opening of the bottom cover blind hole；
The cylinder blank and the end cap blank are welded together by two welding grooves；
Process tool is provided, the process tool is process tool described in claim 1；
It is processed in the other end of the cylinder inner bore and draws hole；
First sharp knife, the second sharp knife, the 3rd sharp knife, floating boring cutter and locating piece on the knife rest are installed, pass through the processing knife
Draw hole described in tool processing, to obtain first stage endoporus；
The process tool is exited into the first stage endoporus, dismantles second sharp knife, the 3rd sharp knife and described floating
Boring cutter, and first sharp knife is adjusted, to increase the length that first sharp knife stretches out the knife rest；
The first stage endoporus is processed by the process tool, to obtain the second stage endoporus；
The process tool is exited into the second stage endoporus, first sharp knife is adjusted, is stretched with increasing first sharp knife
Go out the length of the knife rest；
The second stage endoporus is processed by the process tool, to obtain shaping endoporus.
4. processing method according to claim 3, which is characterized in that the processing method includes：In the bottom cover blind hole
One end of separate opening process escape.
5. processing method according to claim 3, which is characterized in that the processing method includes：Described in welding two
Before welding groove, installation seam allowance is processed on two welding grooves respectively.
6. processing method according to claim 5, which is characterized in that two it is described installation seam allowances between fit clearance be
0.06mm~0.20mm.
7. processing method according to claim 3, which is characterized in that the processing method includes：Described in welding two
After welding groove, the frame position for cylinder blank described in clamping is processed on the other end periphery wall of the cylinder blank,
The frame position using the center line of the cylinder blank as axis circumferentially.
8. processing method according to claim 7, which is characterized in that the processing method includes：Described in welding two
After welding groove, correction tape is processed on the other end periphery wall of the cylinder blank, the correction tape is with the cylinder body
For axis circumferentially, and the correction tape is located between the other end and the frame position of the cylinder blank center line of blank.
9. processing method according to claim 3, which is characterized in that the processing method includes：When the process tool
When marching to the weld between the cylinder blank and the bottom cover blank, the feed speed of the process tool is reduced.
10. processing method according to claim 3, which is characterized in that the processing method includes：In the process tool
During traveling, the inside of the cylinder blank and the bottom cover is washed away using coolant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710991538.7A CN108044300B (en) | 2017-10-23 | 2017-10-23 | Machining method of oil cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710991538.7A CN108044300B (en) | 2017-10-23 | 2017-10-23 | Machining method of oil cylinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108044300A true CN108044300A (en) | 2018-05-18 |
| CN108044300B CN108044300B (en) | 2019-12-06 |
Family
ID=62119533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710991538.7A Active CN108044300B (en) | 2017-10-23 | 2017-10-23 | Machining method of oil cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108044300B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064813A (en) * | 2019-05-29 | 2019-07-30 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
| CN110722305A (en) * | 2019-08-27 | 2020-01-24 | 武汉船用机械有限责任公司 | Assembly welding tool and assembly welding method for end cover part |
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| DE3835961A1 (en) * | 1987-10-22 | 1989-05-03 | Mitsubishi Metal Corp | Tool firmly clamped or mounted in position |
| CN201799623U (en) * | 2010-08-31 | 2011-04-20 | 安徽全柴锦天机械有限公司 | Boring bar used for processing main bearing holes and thrust surfaces |
| CN204094168U (en) * | 2014-09-24 | 2015-01-14 | 安庆雅德帝伯活塞有限公司 | Piston precision processing high-efficiency multi-function cutter |
| CN104759647A (en) * | 2015-04-19 | 2015-07-08 | 内蒙古北方重型汽车股份有限公司 | Adjustable chamfering boring tool and method for conducting hole chamfering |
| CN205464443U (en) * | 2016-03-31 | 2016-08-17 | 重庆工商职业学院 | Deep hole boring cutter wedge type outer supporting stabilising arrangement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3835961A1 (en) * | 1987-10-22 | 1989-05-03 | Mitsubishi Metal Corp | Tool firmly clamped or mounted in position |
| CN201799623U (en) * | 2010-08-31 | 2011-04-20 | 安徽全柴锦天机械有限公司 | Boring bar used for processing main bearing holes and thrust surfaces |
| CN204094168U (en) * | 2014-09-24 | 2015-01-14 | 安庆雅德帝伯活塞有限公司 | Piston precision processing high-efficiency multi-function cutter |
| CN104759647A (en) * | 2015-04-19 | 2015-07-08 | 内蒙古北方重型汽车股份有限公司 | Adjustable chamfering boring tool and method for conducting hole chamfering |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110064813A (en) * | 2019-05-29 | 2019-07-30 | 湖北三江航天江北机械工程有限公司 | The welding method of airborne pencil rocket shell |
| CN110064813B (en) * | 2019-05-29 | 2021-05-07 | 湖北三江航天江北机械工程有限公司 | Welding method for airborne small rocket shell |
| CN110722305A (en) * | 2019-08-27 | 2020-01-24 | 武汉船用机械有限责任公司 | Assembly welding tool and assembly welding method for end cover part |
| CN110722305B (en) * | 2019-08-27 | 2021-07-02 | 武汉船用机械有限责任公司 | Assembly welding tool and assembly welding method for end cover part |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108044300B (en) | 2019-12-06 |
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