CN112355627A - Tuner assembling process - Google Patents
Tuner assembling process Download PDFInfo
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- CN112355627A CN112355627A CN202011022925.8A CN202011022925A CN112355627A CN 112355627 A CN112355627 A CN 112355627A CN 202011022925 A CN202011022925 A CN 202011022925A CN 112355627 A CN112355627 A CN 112355627A
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- station
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- tuner
- resonance cover
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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
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
- B23P21/002—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control the units stationary whilst being composed
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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
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
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Abstract
The invention discloses a tuner assembly process, which comprises the following steps of placing a needle core on a resonance cover, and punching and closing the resonance cover provided with the needle core; placing the PCB welded with the pin needle in the resonance cover, and welding an F head of the resonance cover; step three, combining the resonance cover and the main body; step four, combining the shell, the main body, the cap and the F-head waterproof ring; and meanwhile, the label is pasted to form a complete tuner. And step five, putting the combined tuner into a carton for packaging. The tuner assembly process has the characteristics of most saved working procedures and high production efficiency.
Description
Technical Field
The invention relates to the field of production processes, in particular to a tuner assembling process.
Background
The high-frequency head is formed by combining a plurality of components, namely a pin needle, a resonance cover, a main body, a shell, a cap and an F-head waterproof ring, wherein the combination modes of the components are different.
In view of the above problems, the present invention provides a tuner assembling process, and the tuner assembling process is accordingly provided.
Disclosure of Invention
The invention provides a tuner assembly process, which has the characteristics of most saved procedures and high production efficiency; specifically, the invention is realized by the following technical scheme:
a tuner assembling process comprises the following steps,
placing a needle core on a resonance cover, and punching and closing the resonance cover provided with the needle core;
placing the PCB welded with the pin needle in the resonance cover, and welding an F head of the resonance cover;
step three, combining the resonance cover and the main body;
step four, combining the shell, the main body, the cap and the F-head waterproof ring; and meanwhile, the label is pasted to form a complete tuner.
And further, adding a fifth step after the fourth step, wherein the fifth step is to place the combined tuner into a carton for packaging.
Furthermore, the tuner assembling process is completed on a tuner automatic assembling line, and the tuner automatic assembling line comprises a first assembly line, a second assembly line, a third assembly line and a fourth assembly line which are sequentially connected; the first assembly line is used for completing the combination of the resonance cover and the stylet; the second assembly line is used for completing the combination of the PCB and the resonance cover; the third assembly line is used for completing the combination of the resonance cover and the main body; the fourth assembly line is used for completing the combination of the shell, the main body, the cap and the F-head waterproof ring; each production line is provided with a plurality of stations, and two adjacent production lines are connected through arranging a connecting station.
Further, the first production line comprises a resonance cover feeding station, a needle core feeding station and a stamping closing-in station which are connected in sequence;
the resonance cover feeding station is used for realizing the feeding of the resonance cover, and a resonance cover arranger and a manipulator are arranged on the station;
the needle core feeding station is used for realizing needle core feeding, and a needle core arranging device and a manipulator are arranged on the station;
the punching and closing station is used for realizing the compaction of the assembled needle core and the assembled resonance cover through the air cylinder, and the air cylinder is arranged on the station.
Further, the second production line comprises a PCB feeding station and an automatic welding F-head station which are connected in sequence;
the PCB feeding station is used for placing the PCB welded with the pin needles into the resonance cover;
the automatic welding F head station is used for welding the F head of the resonance cover, and welding equipment is arranged on the station.
Furthermore, a first material preparation area is arranged between the PCB feeding stations and used for placing products produced on a first production line; and a second material preparation area behind the F-head automatic welding station is used for placing the products finished on the second production line.
Further, the third assembly line comprises a main body feeding station, a resonance cover and main body assembling station, a screw locking station and a product testing station which are connected in sequence, wherein the F head is welded on the resonance cover and main body assembling station;
the main body feeding station is used for realizing main body feeding;
the resonance cover welded with the F head is arranged in the main body assembly station for realizing the purpose of placing the resonance cover welded with the F head in the main body;
the screw locking station is used for realizing the connection and combination of the resonance cover and the main body to form a resonance cover and main body combination body, and an automatic screw locking machine is arranged on the station;
the product testing station is used for screening qualified resonance cover and main body combination bodies, and detection equipment is arranged on the station.
Further, the fourth production line comprises a shell feeding station, a shell and main body assembling station, a cap feeding station, a cap pressing station, an F-head waterproof ring feeding station, an F-head waterproof ring pressing station and a label pasting station which are connected in sequence;
the shell feeding station is used for realizing shell feeding;
the shell and main body assembling station is used for realizing the pressing fit of the shell and the main body to form a shell main body, and a punch press is arranged on the station;
the cap feeding station is used for placing a cap on the shell body, and the cap arranging device and the mechanical arm are arranged on the station;
the cap pressing station is used for realizing the pressing of the cap and the shell body, and a pneumatic punching machine is arranged on the station;
the F-head waterproof ring feeding station is used for placing the F-head waterproof ring on the main body, and the F-head waterproof ring arranging device and the manipulator are arranged on the station;
the F head waterproof ring pressing station is used for realizing the pressing of the F head waterproof ring and the main body to form the tuner, and an automatic punching machine is arranged on the station;
the label pasting station is used for pasting labels on the assembled products, and a label feeder and a manipulator are arranged on the station.
Furthermore, a fifth production line is arranged behind the fourth production line and used for finishing packaging of the tuner; a fourth connecting station is arranged between the fourth production line and the fifth production line, and a manipulator is arranged on the station; the fifth assembly line comprises a paper folding box station, a paper covering box station and a boxing station which are connected in sequence;
the paper box folding station is used for folding the paper boards into paper boxes and placing the paper boxes on the conveying mechanism;
the paper box covering station is used for placing the assembled tuner, the manipulator on the connecting station places the assembled tuner on the fourth production line in the paper box of the station, and the paper box is covered on the paper box;
and the boxing station is used for finishing boxing work.
Furthermore, a first connecting station is arranged between the first production line and the second production line, and a manipulator is arranged on the station;
a second connecting station is arranged between the second assembly line and the third assembly line, and a manipulator is arranged on the station;
and a third connecting station is arranged between the third assembly line and the fourth assembly line, and a manipulator is arranged on the station.
The beneficial effect of this application lies in:
divide into five steps with the assembly process scientific and reasonable of tuner, realize production efficiency maximize, simultaneously according to the equipment technology step of tuner, set up the automatic assembly line of tuner, this assembly line includes five assembly lines, divide various processing station in every production line, connect with conveying mechanism between each station on every production line, and set up each linking station and link up adjacent production line, the automation has been realized, only go upward at six stations and need operating personnel, compare in original 24 operating personnel, artifical participation greatly reduced, the degree of automation increases, production efficiency has obtained great improvement.
Drawings
Fig. 1 is a schematic view of an embodiment of an automatic tuner assembly line according to the present invention.
Wherein: 1. a resonance cover feeding station; 2. a needle core feeding station; 3. a punching closing station; 4. a first joining station; 5. a PCB feeding station; 6. automatically welding an F head station; 7. a second joining station; 8. a main body feeding station; 9. welding the resonance cover with the F head and a main body assembling station; 10. a screw locking station; 11. a product testing station; 12. a third joining station; 13. a shell feeding station; 14. a housing and body assembly station; 15. a cap feeding station; 16. a cap pressing station; 17. f, a waterproof ring feeding station; 18. pressing an F-head waterproof ring station; 19. a label pasting station; 20. a fourth joining station; 21. a paper folding box station; 22. a paper box covering station; 23. a boxing station; 24. a first pipeline; 25. a second pipeline; 26. a third pipeline; 27. a fourth pipeline; 28. a fifth pipeline; 29. a first material preparation area; 30. a second material preparation area; 31. and (4) an operator.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
A tuner assembly process comprises the following steps:
firstly, placing a needle core on a resonance cover, and closing the resonance cover provided with the needle core in a punching way; the punching of the two is realized by a punch.
Secondly, placing the PCB welded with the pin needles in the resonance cover, and welding the F head of the resonance cover.
Third, combining the resonant enclosure and the body: specifically, the resonance cover is placed on the main body, and a screw is screwed at the joint of the resonance cover and the main body.
Fourthly, combining the shell, the main body, the cap and the F-head waterproof ring, and simultaneously finishing label pasting to form a complete tuner; specifically, the shell is firstly pressed on the main body provided with the resonance cover, and the cap and the F-head waterproof ring are sequentially pressed.
And fifthly, putting the combined tuner into a carton for packaging.
According to the processing steps, designing an automatic tuner assembling line, as shown in fig. 1, which comprises five assembly lines and connecting stations, wherein the connecting stations are used for connecting two adjacent assembly lines, each assembly line is provided with a plurality of stations, and the stations on each assembly line are connected through a conveying mechanism; the five assembly lines sequentially comprise the following steps according to the processing sequence: a first pipeline 24, a second pipeline 25, a third pipeline 26, a fourth pipeline 27 and a fifth pipeline 28.
The PLC is adopted to control the tuner automatic assembly line in the whole process.
Wherein, the first assembly line 24 is used for finishing the pressing combination of the resonance cover and the needle core, and comprises a resonance cover feeding station 1, a needle core feeding station 2 and a punching closing-up station 3 which are connected in sequence.
A resonance cover feeding station 1, wherein a resonance cover arrayer and a manipulator are arranged on the station; the resonance covers are orderly arranged through the resonance cover arranging device, the PLC is used for automatically controlling the manipulator to finish accurate acquisition and automatic turnover within two seconds, the resonance covers are accurately placed on a jig of the conveying mechanism, and the placement position error precision is within five threads; the resonant hood arranger only needs about half an hour for the previous material.
A needle core feeding station 2, wherein a needle core arranging device and a mechanical arm are arranged on the station; the needle cores are orderly arranged according to requirements through the needle core arranging device, the PLC is used for automatically controlling the mechanical arm to finish accurately obtaining the needle cores within two seconds, the mechanical arm accurately places the needle cores at a specified position on the resonance cover on the conveying mechanism, and the error precision of the placement position is within five filaments; the needle core arranging device only needs half an hour for the previous material.
A stamping closing-in station 3, wherein a cylinder is arranged on the station; and (4) compressing and closing the assembled needle core and the resonance cover by an air cylinder.
A first connecting station 4 is arranged between the first production line 24 and the second production line 25, and a manipulator is arranged on the station; the resonance cover with the pressed needle core on the first production line 24 is accurately obtained by the mechanical arm and automatically overturned and transferred to the second production line 25.
The second pipeline 25 is used for completing the combination of the PCB and the resonance cover and welding the F head of the resonance cover; the automatic welding machine comprises a PCB feeding station 5 and an automatic welding F-head station 6 which are sequentially connected.
PCB board material loading station 5, on this station, operating personnel 31 will weld the PCB board of pin needle and put into the resonance cover, should resonate the cover and transfer from first assembly line 24 by the manipulator on the first linking station 4 and come.
A first material preparation area 29 is arranged in front of the PCB feeding station 5, a mechanical arm on the first connecting station 4 presses the resonance cover of the needle core on the first production line 24, the resonance cover is automatically turned over and transferred to the first material preparation area 29 of the second production line 25, and four stations are reserved in the first material preparation area 29.
An F-head automatic welding station 6, wherein welding equipment is arranged on the station; the welding head is controlled to descend through the servo screw rod to weld, the descending distance is controlled within two wires, the welding temperature is accurately controlled at 360 degrees through the temperature controller, and the F head of the resonance cover is welded.
A second material preparation area 30 is arranged behind the automatic welding F-head station 6, the second material preparation area 30 is provided with four station buffers, and the welded resonance cover flows into the second material preparation area 30.
A second connecting station 7 is arranged between the second production line 25 and the third production line 26, and a manipulator is arranged on the station; the resonance cover welded with the F head in the second material preparation area 30 on the second assembly line 25 is accurately obtained through a manipulator and is automatically turned over and conveyed to the designated position of the third assembly line 26.
The third assembly line 26 is used for combining the resonance cover and the main body, and comprises a main body feeding station 8, a resonance cover and main body assembling station 9, a screw locking station 10 and a product testing station 11 which are sequentially connected and arranged, wherein the F head is welded.
And a main body feeding station 8, wherein an operator 31 accurately places the main body into a jig of the conveying mechanism.
The resonance cover welded with the F-head is placed in a main body assembling station 9, and the resonance cover welded with the F-head on the second production line 25 is placed in a prepared main body through a manipulator on a second connecting station 7.
A screw locking station 10, wherein an automatic screw locking machine is arranged on the station; controlling an automatic screw locking machine through a stepping motor, automatically locking screws at accurate positions, combining a resonance cover and a main body to form a resonance cover and main body combined body, wherein the position deviation is required to be within 2 wires, and the torque is controlled to be 50-60N/m; four screw locking stations 10 are provided.
A product testing station 11, on which detection equipment is arranged; through check out test set automatic test resonance cover and main part assembly, check out test set passes through the test connection of connection such as cable, settles test connection on the corresponding tool of cylinder, tests the performance of product, and test value carries out data feedback, and the data yields and the defective products signal feedback of feedback are to PLC, and the action is to the rejection of defective products.
A third connecting station 12 is arranged between the third production line 26 and the fourth production line 27, and a manipulator is arranged on the station; automatically acquiring a resonance cover and main body assembly with excellent performance on the third assembly line 26 through a manipulator, and turning and accurately feeding the resonance cover and main body assembly to a specified position on the fourth assembly line 27;
the fourth production line 27 is used for completing the combination of the shell, the main body, the cap and the F-head waterproof ring and simultaneously completing the label pasting; the flowing water comprises a shell feeding station 13, a shell and main body assembling station 14, a cap feeding station 15, a cap pressing station 16, an F-head waterproof ring feeding station 17, an F-head waterproof ring pressing station 18 and a label pasting station 19 which are sequentially connected.
A shell loading station 13, at which an operator 31 places the shell on a jig of the conveying mechanism;
a housing and body assembly station 14 on which a punch is located; the mechanical arm on the third joining station 12 puts the resonance cover and the main body assembly assembled on the third assembly line 26 into the shell of the station, and the shell and the main body are pressed well automatically by controlling the pneumatic punch through the PLC.
A cap feeding station 15 on which a cap aligner and a manipulator are arranged; the caps are orderly arranged by the cap arranging device, the PLC is used for automatically controlling the manipulator to complete actions of grabbing the caps and placing the caps on the cap shell body within 2 seconds, and the precision of errors of the grabbing position and the placing position is accurately within 5 threads. The cap aligner is used for feeding once in half an hour.
A cap pressing station 16 on which a pneumatic punch is arranged; and the PLC-controlled pneumatic punching machine is used for punching the shell body and the cap which are placed together.
An F-head waterproof ring feeding station 17, wherein an F-head waterproof ring arrayer and a manipulator are arranged on the station; the F-head waterproof rings are orderly arranged through the waterproof ring arranging device, the PLC is used for automatically controlling the manipulator to complete grabbing the F-head waterproof rings within 2 seconds and place the F-head waterproof rings on the main body, and the F-head waterproof ring arranging device is fed once in half an hour.
And pressing an F-head waterproof ring station 18, wherein an automatic punch is arranged on the station, and the F-head waterproof ring and the main body are pressed and combined by the automatic punch through an automatic punch press to complete tuner assembly.
A fourth connecting station 20 is arranged between the fourth production line 27 and the fifth production line 28, a manipulator is arranged on the station, and the tuner assembled on the fourth production line 27 is transferred to a specified position of the fifth production line 28 through the PLC control manipulator.
And the fifth production line is used for packaging the assembled tuner and comprises a paper folding box station 21, a paper covering box station 22 and a boxing station 23 which are sequentially connected.
A paper box folding station 21, at which the operator 31 folds the paper box and puts the paper box in a designated position.
And a paper box covering station 22, wherein a manipulator on the connecting station places the assembled tuner on the fourth production line 27 into the paper box at the station, and meanwhile, an operator 31 covers the paper box with the paper box.
A boxing station 23 at which an operator 31 completes the boxing operation.
The above is the preferred embodiment of the present invention, and several other simple substitutions and modifications made on the premise of the inventive concept should be considered as falling into the protection scope of the present invention.
Claims (10)
1. A tuner assembly process is characterized in that: comprises the following steps of (a) carrying out,
placing a needle core on a resonance cover, and punching and closing the resonance cover provided with the needle core;
placing the PCB welded with the pin needle in the resonance cover, and welding an F head of the resonance cover;
step three, combining the resonance cover and the main body;
step four, combining the shell, the main body, the cap and the F-head waterproof ring; and meanwhile, the label is pasted to form a complete tuner.
2. The tuner assembly process according to claim 1, wherein: and adding a fifth step after the fourth step, wherein the fifth step is to place the combined tuner into a carton for packaging.
3. A tuner assembly process as claimed in claim 1 or claim 2, wherein: the tuner assembling process is completed on a tuner automatic assembling line, and the tuner automatic assembling line comprises a first assembly line, a second assembly line, a third assembly line and a fourth assembly line which are sequentially connected; the first assembly line is used for completing the combination of the resonance cover and the stylet; the second assembly line is used for completing the combination of the PCB and the resonance cover; the third assembly line is used for completing the combination of the resonance cover and the main body; the fourth assembly line is used for completing the combination of the shell, the main body, the cap and the F-head waterproof ring; each production line is provided with a plurality of stations, and two adjacent production lines are connected through arranging a connecting station.
4. A tuner assembly process as claimed in claim 3, wherein: the first assembly line comprises a resonance cover feeding station, a needle core feeding station and a stamping closing-in station which are connected in sequence;
the resonance cover feeding station is used for realizing the feeding of the resonance cover, and a resonance cover arranger and a manipulator are arranged on the station;
the needle core feeding station is used for realizing needle core feeding, and a needle core arranging device and a manipulator are arranged on the station;
the punching and closing station is used for realizing the compaction of the assembled needle core and the assembled resonance cover through the air cylinder, and the air cylinder is arranged on the station.
5. A tuner assembly process as claimed in claim 3, wherein: the second assembly line comprises a PCB feeding station and an automatic welding F-head station which are connected in sequence;
the PCB feeding station is used for placing the PCB welded with the pin needles into the resonance cover;
the automatic welding F head station is used for welding the F head of the resonance cover, and welding equipment is arranged on the station.
6. A tuner assembly process as claimed in claim 3, wherein: a first material preparation area is arranged between the PCB feeding stations and used for placing products produced on a first production line; and a second material preparation area behind the F-head automatic welding station is used for placing the products finished on the second production line.
7. A tuner assembly process as claimed in claim 3, wherein: the third assembly line comprises a main body feeding station, a resonance cover and main body assembling station welded with an F head, a screw locking station and a product testing station which are connected in sequence;
the main body feeding station is used for realizing main body feeding;
the resonance cover welded with the F head is arranged in the main body assembly station for realizing the purpose of placing the resonance cover welded with the F head in the main body;
the screw locking station is used for realizing the connection and combination of the resonance cover and the main body to form a resonance cover and main body combination body, and an automatic screw locking machine is arranged on the station;
the product testing station is used for screening qualified resonance cover and main body combination bodies, and detection equipment is arranged on the station.
8. A tuner assembly process as claimed in claim 3, wherein:
the fourth assembly line comprises a shell feeding station, a shell and main body assembling station, a cap feeding station, a cap pressing station, an F-head waterproof ring feeding station, an F-head waterproof ring pressing station and a label pasting station which are connected in sequence;
the shell feeding station is used for realizing shell feeding;
the shell and main body assembling station is used for realizing the pressing fit of the shell and the main body to form a shell main body, and a punch press is arranged on the station;
the cap feeding station is used for placing a cap on the shell body, and the cap arranging device and the mechanical arm are arranged on the station;
the cap pressing station is used for realizing the pressing of the cap and the shell body, and a pneumatic punching machine is arranged on the station;
the F-head waterproof ring feeding station is used for placing the F-head waterproof ring on the main body, and the F-head waterproof ring arranging device and the manipulator are arranged on the station;
the F head waterproof ring pressing station is used for realizing the pressing of the F head waterproof ring and the main body to form the tuner, and an automatic punching machine is arranged on the station;
the label pasting station is used for pasting labels on the assembled products, and a label feeder and a manipulator are arranged on the station.
9. A tuner assembly process as claimed in claim 3, wherein: a fifth production line is arranged behind the fourth production line and used for finishing packaging of the tuner; a fourth connecting station is arranged between the fourth production line and the fifth production line, and a manipulator is arranged on the station; the fifth assembly line comprises a paper folding box station, a paper covering box station and a boxing station which are connected in sequence;
the paper box folding station is used for folding the paper boards into paper boxes and placing the paper boxes on the conveying mechanism;
the paper box covering station is used for placing the assembled tuner, the manipulator on the connecting station places the assembled tuner on the fourth production line in the paper box of the station, and the paper box is covered on the paper box;
and the boxing station is used for finishing boxing work.
10. A tuner assembly process as claimed in claim 3, wherein: a first connecting station is arranged between the first production line and the second production line, and a manipulator is arranged on the first connecting station;
a second connecting station is arranged between the second assembly line and the third assembly line, and a manipulator is arranged on the station;
and a third connecting station is arranged between the third assembly line and the fourth assembly line, and a manipulator is arranged on the station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022925.8A CN112355627B (en) | 2020-09-25 | 2020-09-25 | Tuner assembling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011022925.8A CN112355627B (en) | 2020-09-25 | 2020-09-25 | Tuner assembling process |
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| Publication Number | Publication Date |
|---|---|
| CN112355627A true CN112355627A (en) | 2021-02-12 |
| CN112355627B CN112355627B (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011022925.8A Active CN112355627B (en) | 2020-09-25 | 2020-09-25 | Tuner assembling process |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2503672Y (en) * | 2001-04-16 | 2002-07-31 | 中山圣马丁电子元件有限公司 | KU frequency-channel satellite receiving tuner |
| JP2004146301A (en) * | 2002-10-28 | 2004-05-20 | Kyocera Corp | Button device |
| CN202150842U (en) * | 2011-07-28 | 2012-02-22 | 珠海市肯普电子科技有限公司 | C-band dual local oscillator and dual output frequency demultiplier capable of effectively reducing noises and interferences |
| CN104842154A (en) * | 2014-02-14 | 2015-08-19 | 陈江 | Automatic tuner assembly production line |
| CN209435216U (en) * | 2018-08-03 | 2019-09-24 | 东莞百一电子有限公司 | A kind of dual output tuner with final election switch |
-
2020
- 2020-09-25 CN CN202011022925.8A patent/CN112355627B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2503672Y (en) * | 2001-04-16 | 2002-07-31 | 中山圣马丁电子元件有限公司 | KU frequency-channel satellite receiving tuner |
| JP2004146301A (en) * | 2002-10-28 | 2004-05-20 | Kyocera Corp | Button device |
| CN202150842U (en) * | 2011-07-28 | 2012-02-22 | 珠海市肯普电子科技有限公司 | C-band dual local oscillator and dual output frequency demultiplier capable of effectively reducing noises and interferences |
| CN104842154A (en) * | 2014-02-14 | 2015-08-19 | 陈江 | Automatic tuner assembly production line |
| CN209435216U (en) * | 2018-08-03 | 2019-09-24 | 东莞百一电子有限公司 | A kind of dual output tuner with final election switch |
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| Publication number | Publication date |
|---|---|
| CN112355627B (en) | 2022-03-01 |
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