CN110238205A - A kind of spinneret of self-healing - Google Patents
A kind of spinneret of self-healing Download PDFInfo
- Publication number
- CN110238205A CN110238205A CN201910606830.1A CN201910606830A CN110238205A CN 110238205 A CN110238205 A CN 110238205A CN 201910606830 A CN201910606830 A CN 201910606830A CN 110238205 A CN110238205 A CN 110238205A
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- Prior art keywords
- inner tube
- outer tube
- spinneret
- tube
- self
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
The invention discloses a kind of spinnerets of self-healing, including outer tube, the outer tube has straight line introduction segment, bending deformation section and stable section, it further include inner tube, the axial length of said inner tube is less than the axial length of outer tube, said inner tube is lining in outer tube out of straight line introduction segment, and said inner tube is by constraining the movement relative to outer tube with the CONTACT WITH FRICTION of outer tube.Spinneret of the invention do not change Laying head it is original dynamically balanced under the premise of, solve local friction's wear problem caused by spinneret and hot-rolled product CONTACT WITH FRICTION with the principle of sliding inner tube.
Description
Technical field
The present invention relates to spinneret technical field, in particular to a kind of spinneret of self-healing.
Background technique
Laying head is the key equipment on high speed wire rod finishing block production line, and the water cooling section of cooling line is controlled after finishing mill
Between scattered volume transporter.And spinneret is as one of most important component of Laying head, wire rod is by pinch rod and spinning power traction
Under the comprehensive functions such as motive force, relative inertness power, frictional force, the normal pressure risen, changing linear motion is screw, forms diameter
About the ballast coil of Ф 1080mm spues from spinneret.
For many years, generally approve in the industry:, can by radially limiting hot-rolled product in a smaller space
With the rolling of higher speed.Patent document if notification number is CN100333848C discloses a kind of Laying pipe, the Laying pipe packet
Outer tube is included, which includes first straight line shape part, the second spiral section and third circular portion, and outer tube is interior inserted with interior
Pipe, the overall diameter of inner tube are substantially equal to the interior diameter of the outer tube, and the length of inner tube is slightly longer than the length of first straight line shape part, and
And inner and outer tubes are fixed to one another and the arrival end welding in rolled products.
Inner tube reduces the aperture size of spinneret, and hot-rolled product is radially limited within smaller space, improves
It introductory and exports ring-like more consistent to coolconveyer, is enable to the rolling of higher speed；However this
The pipe abrasion that a little advantages have largely been greatly accelerated is offset.
Entitled " the high-speed wire spinning machine spinning published in the o. 11th of volume 8 for " Chinese engineering science " periodical 2006
Tube space CURVE STUDY and improvement " paper in describe spinneret work when, wire rod travels forward in spinneret, due to by
To the frictional resistance of spinning tube wall backward, certain micro- section of wire rod is always by the push-and-pull action of its front and back adjacent part, therefore wire rod has one
Fixed " axial force ", and always along wire rod centerline direction；Wire rod relative velocity variation in spinneret is also described simultaneously to become
Gesture figure, spinning inside pipe wall pressure distribution map (as shown in Figure 4) and spinning inside pipe wall friction distribution map are (such as Fig. 5 institute
Show).
It analyzes after study, wire rod is suffered after entering spinning tube inlet to be increased dramatically, and the maximum position of frictional force exists
Distance spinning tube inlet 500mm or so, the position are the deformation the initial segment of spinneret, and wire rod is contacted in this position with spinning tube wall
Limited area, since long-time is worn, certainty is worn out first at this.
Summary of the invention
The purpose of the present invention is to provide a kind of spinneret of self-healing, it is not change Laying head original dynamically balanced
Under the premise of, local friction caused by spinneret and hot-rolled product CONTACT WITH FRICTION, which is solved, with the principle of sliding inner tube wears.
Above-mentioned purpose of the invention has the technical scheme that
A kind of spinneret of self-healing, including outer tube, the outer tube have straight line introduction segment, bending deformation section and stable section,
It further include inner tube, the axial length of said inner tube is less than the axial length of outer tube, and said inner tube is lining in outer out of straight line introduction segment
Guan Zhong, said inner tube is by constraining the movement relative to outer tube with the CONTACT WITH FRICTION of outer tube.
By using above-mentioned technical proposal, when spinneret experience heating is with cooling cycle, inner tube will be along towards outer tube
A direction of output end progressively shift, which will change the interior table of inner tube and hot-rolled product CONTACT WITH FRICTION
Face, and the inner surface of inner tube and hot-rolled product CONTACT WITH FRICTION is therefore updated, to avoid wire rod lasting at any given area
CONTACT WITH FRICTION, in this way, interior pipe internal surface wearing depth is reduced to pervious 15% or so under same steel transportation amount, thus
Prevent zanjon sleave etc. is improper from changing Guan Xianxiang.
The present invention is further arranged to: said inner tube and outer tube transition fit, maximal clearance 0.2mm, maximum interference are
0.05mm。
By using above-mentioned technical proposal, axial dimension is to be lining in outer tube, frictional force between the two in lesser inner tube
It is greatly reduced, and the design of inner tube and outer tube transition fit can effectively improve the advance amount of inner tube, improve spinneret
Steel transportation amount.
The present invention is further arranged to: the axial dimension of said inner tube is 500-1500mm.
The present invention is further arranged to: the wall thickness of said inner tube is 1-7~9mm.
The present invention is further arranged to: said inner tube and the outer tube are metal tube, and it includes ferrous metal, nickel that metal, which is selected from,
The group of based alloy, cobalt-base alloys and titanium-base alloy.
In conclusion the invention has the following advantages:
1, by the way of being lining in outer tube in inner tube, and inner tube with the constraint of the CONTACT WITH FRICTION of outer tube relative to outer tube only by transporting
Dynamic, inner tube is able to respond during spinneret rotates about the axis thereof is progressively moved in outer tube in heating and cooling cycle, should
Gradual movement be used to periodically convert with the inner tube surface of hot-rolled product CONTACT WITH FRICTION and thus update and hot-rolled product
The inner tube surface of CONTACT WITH FRICTION, the CONTACT WITH FRICTION for avoiding inner tube wall arbitrary region lasting；
2, the amount of unbalance of the double-deck spinneret is limited within the permission amount of unbalance of Laying head, keeps the double-deck spinneret straight
It takes over and changes single layer spinneret and used on former Laying head, do not need to do dynamic balancing again, avoid the stop production to overhaul of unplanned property
Influence to the normal production order of factory, the promotion to plant produced efficiency and economic benefit are all significant.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment middle external tube；
Fig. 2 is the structural schematic diagram of embodiment；
Fig. 3 A to Fig. 3 C is the description of diagrammatic, shows the power acted on during heating with cooling cycle on inner pipe；
Fig. 4 is spinning inside pipe wall pressure distribution map；
Fig. 5 is spinning inside pipe wall friction distribution map.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment: a kind of spinneret of self-healing, as shown in Figure 1, including outer tube 1, outer tube 1 is along its input terminal to output
End sets gradually as straight line introduction segment 1A, bending deformation section 1B and stable section 1C, straight line introduction segment 1A, bending deformation section 1B and steady
Determine section 1C integrated molding.
As shown in Fig. 2, further including inner tube 2, the axial dimension of inner tube 2 is less than the axial dimension of outer tube 1, preferably 500-
1500mm.Inner tube 2 is lining in outer tube 1 out of straight line introduction segment 1A, the two transition fit, maximal clearance 0.2mm, and maximum interference is
0.05mm, inner tube 2 is only by constraining the movement relative to outer tube 1 with the CONTACT WITH FRICTION of outer tube 1；Inner tube 2 is constituted with outer tube 1 and is spat
Fiber tube main body.
Outer tube 1 and inner tube 2 can be manufactured by various metals, preferably ferrous metal, nickel-base alloy, cobalt-base alloys and
Titanium-base alloy.
Existing research shows that the inner wall of spinneret tends in straight line introduction segment and the transitional region L of bending deformation section produce
Raw to accelerate concentrated wear, if developed as one pleases, which will lead to spinning inside pipe wall and is prematurely formed groove, result then in production
Product penetrate spinning tube wall.
And the wear problem can be addressed in the following manner: with being lining in outer tube 1 in inner tube 2, and in only allowing
Pipe 2 is limited in outer tube 1 by the CONTACT WITH FRICTION between their corresponding surfaces externally and internallies to be moved.
It when spinneret is in use, can be rotated around Laying head axis, hot-rolled product is by spinneret, in spinneret
Changing linear motion is screw, and the ballast coil of formation spues from spinneret.In the above process, inner tube 2 with hot rolling due to producing
Product are contacted and are heated.In general, hot-rolled product can be in about 900 DEG C to 1100 DEG C of temperature, this meeting is so that inner tube 2 is heated to about
400 DEG C of temperature.Outer tube 1 has lower temperature since it is exposed to ambient enviroment usually.
In addition, when hot-rolled product passes through inner tube 2 one can be applied to inner tube 2 with the axial force of interior pipe friction, hot-rolled product
Driving force FD。
As shown in fig. 3, it being heated and being contacted with hot-rolled product due to inner tube 2, inner tube 2 will expand,
To along towards arrival end (arrow FEE) and output end (arrow FDE) contrary both direction applied force.Expansive force
FEEAnd FDEFrictional resistance F is overcome enoughF.Expansive force FEEInflated power FDEWith driving force FDResultant force overcome, so as to cause inner tube
2 progressively shift in outer tube 1 towards the output end of outer tube 1.
As shown in Figure 3B, when the temperature of inner tube 2 is stablized, without expansive force or convergent force.Frictional force FFOvercome driving
Power FD, therefore inner tube 2 remains fixed within outer tube 1.
As shown in FIG. 3 C, when inner tube 2 is cooling, inner tube 2 shrinks experience, again towards arrival end (arrow CEE) and it is defeated
Outlet (arrow CDE) apply two opposite power.Power CEEAnd CDEFrictional force F is overcome enoughF.Convergent force CEEIt is retracted power CDEWith drive
Power FDResultant force overcome, progressively shifted in outer tube 1 towards the output end of outer tube 1 so as to cause the arrival end of inner tube 2.
It is to be understood, therefore, that inner tube 2 will be along the output towards outer tube 1 when spinneret experience heating is with cooling cycle
One direction at end progressively shifts, which will change the inner surface of inner tube 2 and hot-rolled product CONTACT WITH FRICTION, and because
This updates the inner surface of inner tube 2 and hot-rolled product CONTACT WITH FRICTION, the CONTACT WITH FRICTION for being avoided 2 inner wall arbitrary region of inner tube lasting.
In the present invention, 2 axial dimension of inner tube is much smaller than the axial dimension of outer tube 1, naturally it is also possible to be selected as whole inlay and manage, i.e.,
Inner tube 2 and outer tube 1 are isometric, are both able to solve the excessive problem of spinning inside pipe wall concentrated wear.
But the spinneret that should be noted that whole edge pipe, frictional force between inner tube 2 and outer tube 1 is considerably beyond wire rod
Bring driving force.Inner tube 2 is located at bending deformation section 1B's partially due to it will be centrifuged around rotation of Laying head axis
Power, the centrifugal force can resolve into the power F perpendicular to spinneret guide pathN1With the power F applied towards spinneret output endN2。
When the experience of inner tube 2 is heated or cooled, by power FN2With driving force FDThe expansive force or convergent force for overcoming opposite direction make interior
The progressive sliding in outer tube 1 of pipe 2.But power FN2Size be to be determined by centrifugal force, and centrifugal force depends on spinneret around spitting
The revolving speed of silk arbor line rotation.
It describes and spits in the paper of entitled " Laying head vibration and the glissando " of " steel rolling " the 3rd interim publication in 2013
Silk motor rotor structure be it is irregular, when Laying head high speed rotation, Laying head cannot be accomplished preferably to balance completely, this is to lead
Cause Laying head severe shocks one of factor, and vibration influence Laying head can work normally.
It follows that the revolving speed of spinning machine rotor is controlled within the scope of one, centrifugal force caused by inner tube 2
It is limited, so inner tube 2 can only just will do it progressive sliding after Laying head rotor speed reaches a certain value；This will lead to whole
Body inlays the spinneret of pipe in actual use, and shift amount of the inner tube 2 in outer tube 1 is smaller, i.e., inner tube 2 can be updated produces with hot rolling
The inner surface of product CONTACT WITH FRICTION is smaller.
For the inner tube 2 that axial dimension is 500-1500mm compared to the whole inner tube 2 for inlaying pipe, the frictional force of inner and outer pipes first is big
Amplitude is reduced, and the design of inner tube 2 and 1 transition fit of outer tube can effectively improve the advance amount of inner tube 2.Transition fit is internal
The influence of pipe advance amount, is shown in Table 1.
Table 1
In addition, inner tube is added in single layer spinneret it should also be noted that Laying head is for the ready-made dynamic balancing of former single layer spinneret
Mass center can deviate the mass center of former single layer spinneret afterwards, and the variation of centroid position while the imbalance that will affect former single layer spinneret
Amount.
Amount of unbalance after single layer spinneret addition inner tube in former Laying head as still allowed then to illustrate this in amount of unbalance
The double-deck spinneret can directly replace former single layer spinneret and use on former Laying head, not need to do dynamic balancing again, guarantee to spit
The normal operation of silk machine；Conversely, must just shut down and be done again for the double-deck spinneret as being more than that former Laying head allows amount of unbalance
Dynamic balancing, but the stop production to overhaul of this unplanned property, will have a direct impact on the normal production order of factory, time cost and stop production at
This can bring additional burden to factory.
So the amount of unbalance of the double-deck spinneret is kept under the premise of solving spinning inside pipe wall local excessive abrasion
Allow in amount of unbalance in former Laying head, is to improve one of plant produced efficiency and economic benefit most straightforward approach.
Mainly include three steps when determining inner tube specification:
Step 1: calculating total amount of unbalance of Laying head.
The basic data of the total amount of unbalance of Laying head is derived from following procedure:
1, running speed, precision grading and the self weight of Laying head are determined；
2, the unit mass amount of unbalance that permission is found by ISO 1940-1 dynamic balance running standard, is then calculated Laying head
Total amount of unbalance.
Step 2: calculating total amount of unbalance of inner tube.
1,3D scans the CAD model of single layer spinneret；
2, by the interior tube model of each specification of the model foundation (length 500-1500mm, wall thickness 1-7mm~9mm)；
3, each inner tube center-of-mass coordinate is calculated with CAD software；
4, the eccentricity and weight of every section of inner tube are determined for one section with ten centimetres；
5, weight obtains the amount of unbalance of every section of inner tube multiplied by eccentricity, and then obtains total amount of unbalance of inner tube；
6, the table of comparisons of total amount of unbalance, length and wall thickness is formed.
Step 3: determining inner tube specification.
Inner tube specification of the selection in the total amount of unbalance allowed band of Laying head.
Such as the equipment of G6.3 grading, running speed 1000rpm are brought into ISO 1940-1 standard and know often
The amount of unbalance that kilogram equipment allows is 60mmg, if the self weight of the equipment is 1500 kilograms, then maximum allowable 90000mmg
Total amount of unbalance.
According to above-mentioned steps, the inner tube specification table of comparisons made based on the spinneret curve that the equipment uses is as follows.
In the table of comparisons, length unit mm；Wall thickness unit is mm；Amount of unbalance unit is mmg.
The length of interior tube model is determining according to " Pipe Space Curve of High-speed Laying Head research and improvement ", by
The spinning inside pipe wall pressure distribution map and spinning inside pipe wall friction distribution map that the paper is recorded are it is found that in spinneret
Wall friction is concentrated mainly at the position away from spinning tube inlet 500mm-1000mm, so the length of interior tube model is excellent
It is selected as 500-1000mm；In practical application, inner tube length can extend to 1500mm.
The thickness of interior tube model is determined according to spinning pipe outside diameter, and outer diameter is the outer tube of 48.3mm, corresponding 1-7mm wall thickness
Inner tube；The inner tube of wall thickness 9mm is only applied at present in the outer tube that outer diameter is 51mm.
To sum up, factory can be directed to different working conditions, different size inner tube be selected according to target steel transportation amount, to guarantee to spin
The subsequent normal operation of machine, reduce because replacement pipeline caused by reform dynamic balancing, finally effectively improve factory production efficiency and
Economic benefit.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (5)
1. a kind of spinneret of self-healing, including outer tube, the outer tube has straight line introduction segment, bending deformation section and stabilization
Section, it is characterised in that: further include inner tube, the axial length of said inner tube is less than the axial length of outer tube, and said inner tube is from straight line
It is lining in outer tube in introduction segment, said inner tube is by constraining the movement relative to outer tube with the CONTACT WITH FRICTION of outer tube.
2. the spinneret of self-healing according to claim 1, it is characterised in that: said inner tube and outer tube transition fit,
Maximal clearance is 0.2mm, maximum interference 0.05mm.
3. the spinneret of self-healing according to claim 2, it is characterised in that: the axial dimension of said inner tube is 500-
1500mm。
4. the spinneret of self-healing according to claim 3, it is characterised in that: the wall thickness of said inner tube is 1-7 ~ 9mm.
5. the spinneret of self-healing according to claim 1, it is characterised in that: said inner tube and the outer tube are metal
Pipe, metal are selected from the group including ferrous metal, nickel-base alloy, cobalt-base alloys and titanium-base alloy.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910606830.1A CN110238205A (en) | 2019-07-06 | 2019-07-06 | A kind of spinneret of self-healing |
| CN201911187889.8A CN110842037B (en) | 2019-07-06 | 2019-11-27 | Embedded type spinning pipe and specification selection method for internal pipe of embedded type spinning pipe |
| CN201911187888.3A CN110842036B (en) | 2019-07-06 | 2019-11-27 | Self-repairing laying pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910606830.1A CN110238205A (en) | 2019-07-06 | 2019-07-06 | A kind of spinneret of self-healing |
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| Publication Number | Publication Date |
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| CN110238205A true CN110238205A (en) | 2019-09-17 |
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| CN201910606830.1A Pending CN110238205A (en) | 2019-07-06 | 2019-07-06 | A kind of spinneret of self-healing |
| CN201911187889.8A Active CN110842037B (en) | 2019-07-06 | 2019-11-27 | Embedded type spinning pipe and specification selection method for internal pipe of embedded type spinning pipe |
| CN201911187888.3A Active CN110842036B (en) | 2019-07-06 | 2019-11-27 | Self-repairing laying pipe |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911187889.8A Active CN110842037B (en) | 2019-07-06 | 2019-11-27 | Embedded type spinning pipe and specification selection method for internal pipe of embedded type spinning pipe |
| CN201911187888.3A Active CN110842036B (en) | 2019-07-06 | 2019-11-27 | Self-repairing laying pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110781613A (en) * | 2019-07-06 | 2020-02-11 | 北京杜根鸿运科技发展有限公司 | Customized spinning pipe dynamic balance analysis method |
| CN112934984A (en) * | 2021-01-23 | 2021-06-11 | 北京杜根鸿运科技发展有限公司 | Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method |
| CN113770294A (en) * | 2021-09-02 | 2021-12-10 | 江山永利百合实业有限公司 | Chain pin shaft check ring squeeze riveter |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113941609A (en) * | 2021-10-23 | 2022-01-18 | 北京杜根鸿运科技发展有限公司 | High-heat-dissipation spinning pipe and cooling method thereof |
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| US4074553A (en) * | 1977-01-03 | 1978-02-21 | Morgan Construction Company | Laying pipe |
| US4332155A (en) * | 1980-12-18 | 1982-06-01 | Morgan Construction Company | Rolling mill laying pipe |
| US5312065A (en) * | 1992-02-05 | 1994-05-17 | Morgan Construction Company | Rod laying head with front and tail end ring control |
| CN1178728A (en) * | 1996-09-26 | 1998-04-15 | 丹尼利机械设备股份公司 | Screw forming lining tube of screw machine tool and relative repairing method |
| DE19823198A1 (en) * | 1998-05-23 | 1999-11-25 | Schloemann Siemag Ag | Coil laying pipe |
| DE19827348A1 (en) * | 1998-06-19 | 1999-12-23 | Schloemann Siemag Ag | Coil laying device for wire |
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| ITMI20021444A1 (en) * | 2002-07-01 | 2004-01-02 | Danieli Off Mecc | SPIRE SHAPE TUBE |
| ITMI20040308A1 (en) * | 2004-02-24 | 2004-05-24 | Danieli Off Mecc | FORMASPIRE HEAD WITH VIBRATION DAMPING DEVICE |
| CN200988054Y (en) * | 2006-11-21 | 2007-12-12 | 宝山钢铁股份有限公司 | Guide tube of wire producing machine |
| CN101832839B (en) * | 2010-02-09 | 2012-05-23 | 江苏大学 | Pre-equilibrium method of high-speed rotator with complicated structure |
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| CN106048423B (en) * | 2016-07-26 | 2018-03-16 | 浙江朋诚科技有限公司 | A kind of spinneret and its manufacture method |
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2019
- 2019-07-06 CN CN201910606830.1A patent/CN110238205A/en active Pending
- 2019-11-27 CN CN201911187889.8A patent/CN110842037B/en active Active
- 2019-11-27 CN CN201911187888.3A patent/CN110842036B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110781613A (en) * | 2019-07-06 | 2020-02-11 | 北京杜根鸿运科技发展有限公司 | Customized spinning pipe dynamic balance analysis method |
| CN110781613B (en) * | 2019-07-06 | 2023-09-19 | 北京杜根鸿运科技发展有限公司 | Customized spinning tube dynamic balance analysis method |
| CN112934984A (en) * | 2021-01-23 | 2021-06-11 | 北京杜根鸿运科技发展有限公司 | Circumferential prestress self-repairing spinning pipe, processing equipment and spinning pipe self-repairing method |
| CN113770294A (en) * | 2021-09-02 | 2021-12-10 | 江山永利百合实业有限公司 | Chain pin shaft check ring squeeze riveter |
| CN113770294B (en) * | 2021-09-02 | 2024-03-19 | 江山永利百合实业有限公司 | Chain pin shaft check ring squeeze riveter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110842037A (en) | 2020-02-28 |
| CN110842036A (en) | 2020-02-28 |
| CN110842037B (en) | 2021-12-10 |
| CN110842036B (en) | 2021-12-07 |
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