CN109202344A - A kind of semiclosed tube rod class formation welding fixture and its assembly method - Google Patents
A kind of semiclosed tube rod class formation welding fixture and its assembly method Download PDFInfo
- Publication number
- CN109202344A CN109202344A CN201710728793.2A CN201710728793A CN109202344A CN 109202344 A CN109202344 A CN 109202344A CN 201710728793 A CN201710728793 A CN 201710728793A CN 109202344 A CN109202344 A CN 109202344A
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- tube
- tube rod
- plug
- jaw
- rod
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K15/00—Electron-beam welding or cutting
- B23K15/0046—Welding
Abstract
The present invention provides a kind of semiclosed tube rod class formation welding fixture and its assembly methods; wherein fixture includes: casing; plug; protective sleeve; turntable; three-jaw and tail top; the present invention is devised in tube head point with opening, the cannula structure that can be clamped; the circumferential direction of magnetic tape trailer apical pore and the plug of end face positioning are devised in tube rod tail end; by casing, plug assembly in the two sides of pipe fitting to be welded, it can be achieved that the clamping of turntable three-jaw, the assemble welding that tail top is held out against; design of part outer surface is protected, ensure that the axial direction of part and the positioning assembly of end face.In tube rod interior design protective sleeve structure, it can be achieved that the adjustment of protective position, absorption penetrate line excess energy, avoid the scaling loss of inner tubal wall, can meet the welding of the tube rod of different length.Auxiliary connecting structure is devised in the cooperation position of casing and three-jaw, provides rigging position for gasket, the adjustment to component assembly and welding contracted quantity is realized, reduces problems of welded quality caused by welding stress deformation.
Description
Technical field
The present invention relates to welding tool setup technical fields, more particularly to a kind of semiclosed tube rod class formation welding fixture
And its assembly method.
Background technique
The manufacture for frequently involving tube rod structure in engineering practice belongs to for drawing load, positioning and adjust other modular constructions
In important feature.Especially closed at one end, one end open long tube rod structure, usual intracavity diameter is within 100mm, length exists
1100~1300mm；Since this class formation is semiclosed, caliber is small and diameter is profound, it is difficult to realize the machining of inner hole.Usually
It is manufactured using welding mode is combined after segmental machining.For the automatic welding of this kind of semiclosed tube rod, Fixture designing and fixed
Position assembly is most important.
Since semiclosed tube rod structure caliber is small, diameter is profound, for automatic soldering method, shaft and two hold-carryings can not be used
The mode of blue clamping, locking assembly.Therefore, the positioning, assembly, clamping of tube rod welding position two sides and welding contracted quantity tune
It is whole etc., become the difficult point and problem of its welding manufacture.
Currently, the welding fixture and assembly for the tube rod structure of both ends open are as shown in Figure 1.1 both ends of bar pass through end face
Flange 2 positions；Then the end flanges 2 that two sides are passed through by clamp shaft 3, using spring gasket ring 4,5 lock shaft 3 of nut and end face
Flange completes the assembly of bar 1.Lock shaft one end is clamped by three-jaw after assembly, the other end is held out against by tail roof construction, realizes weldering
Concentric locating, preload, the assembly of preceding part.
For tube rod structure closed at one end, as described in Figure 2, a butt welding is designed usually between tube head 6 and tube rod 7
Seam；Closed end has attachment lug in 6 side of tube head, outer end；7 caliber of other end tube rod is open.Therefore, pass through existing weld clip
Tool, there are the following problems for assembly:
1) lock shaft can not realize locking assembly by tube rod both ends, cannot achieve to the extra absorption for penetrating the energy such as line
With the protection of accessory inner surface.
2) closed end of tube head is generally irregular eutectic, can not assembled end flange clamp structure.
3) for assemble welding, for adjust shrinkage spring gasket ring fixture can not fixing assembling, influence to weld preceding size
Contraction distortion in precision adjustment and welding process.
Summary of the invention
Against the above technical problems, the present invention provides a set of welding fixtures suitable for semiclosed tube rod structure, both real
Existing tube rod structure positioning, clamping and assembly, and guarantee the adjustment of welding contracted quantity, there is important engineering application value and meaning
Justice.
The present invention provides a kind of semiclosed tube rod class formation welding fixture, for semiclosed tube rod class formation tube head and
The welding of tube rod, comprising: casing, plug, protective sleeve, turntable, three-jaw and tail top；Described sleeve pipe is the cylinder with opening
The diameter of shape, internal diameter and the tube head matches, and nothing is slidably socketed on the tube head relatively；The plug is disk
Shape, the plug has the boss to match with the opening of the tube rod, and is assemblied in the remote of the tube rod by the boss
From tube head side opening, the center of the plug is provided with screw rod, the center of the plug towards the inside side of the tube rod
The outside side of the tube rod is provided with tail apical pore；The protective sleeve is elongated rod shape, is connected on the screw rod and to institute
The link position that the tube head and tube rod are extended beyond in tube rod is stated, the tail top is connected on the tail apical pore, and described turn
Platform is connected in described sleeve pipe by the three-jaw.
Optionally, air vent is additionally provided on the plug.
Optionally, auxiliary connecting structure, the auxiliary connection are additionally provided among the position that described sleeve pipe is connected with three-jaw
Structure has the annular groove to match with the diameter of described sleeve pipe close to described sleeve pipe side, assembles gasket in the annular groove,
The gasket pad is in the end of the tube head.
Optionally, the length of the screw rod is 100mm~200mm, on the protective sleeve with the screw rod matching coincidence
The screw thread distribution length set is 100mm~200mm.
The present invention also provides a kind of assembly methods of semiclosed tube rod class formation welding fixture, comprising: by casing from opening
Distending at mouthful, is socketed on tube head, and realize interference fit；According to the length of tube rod, protective sleeve screw-in is assembled to plug
Screw rod on, guarantee that the built-in length of protective sleeve is more than welding position, and plug be assembled to by tube rod by the boss of plug
On, tail top is assembled on the tail apical pore of plug；Three-jaw is mounted on turntable, by three-jaw gripping sleeve, realizes determining for tube head
Position assembly；Adjustment makes tail top and three-jaw concentric, holds out against plug by tail top, realizes the docking of tube head and tube rod；In tube head and pipe
The two sides of the docking location of bar, using the circular runout of dial gauge measurement tube rod assembly, the corresponding angle of assembling for adjusting two sides is adjusted
After the completion of whole, three-jaw and tail top are locked, completes component assembly, prepares welding.
Further, described that three-jaw is mounted on turntable, by three-jaw gripping sleeve, realize the positioning assembly step of tube head
Suddenly, further include assembling auxiliary connecting structure and spring shim on three-jaw, then assemble tube head at the rear portion of gasket.
The present invention provides a kind of semiclosed tube rod class formation welding fixture and its assembly methods, devise in tube head point
With opening, the cannula structure that can be clamped, the stifled of magnetic tape trailer apical pore, the circumferential direction of air vent and end face positioning is devised in tube rod tail end
Head, by casing, plug assembly in the two sides of jointed tubular workpieces to be welded, it can be achieved that the assemble welding that turntable three-jaw clamps, tail top is held out against, is protected
Design of part outer surface has been protected, ensure that the axial direction of part and the positioning assembly of end face.In tube rod interior design protective sleeve
Structure is assembled on plug the adjustment, it can be achieved that protective position by screw rod, penetrates line excess energy for absorbing, avoids
The scaling loss of inner tubal wall, can meet the welding of the tube rod of different length.Auxiliary is devised in the cooperation position of casing and three-jaw to connect
Binding structure provides rigging position for elastomeric pad, realizes component assembly and the adjustment of welding contracted quantity, reduces welding and answers
Problems of welded quality caused by power deformation.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Fig. 1 is the welding fixture and installation diagram of the tube rod structure of both ends open in the prior art of the invention；
Fig. 2 is the structural schematic diagram of present invention tube rod structure closed at one end；
Fig. 3 is a kind of structural schematic diagram of casing of the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of plug of the embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of protective sleeve of the embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of auxiliary connecting structure of the embodiment of the present invention；
Fig. 7 is a kind of mounting structure schematic diagram of gasket of the embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of semiclosed tube rod class formation welding fixture of the embodiment of the present invention；
Fig. 9 is a kind of flow chart of the assembly method of semiclosed tube rod class formation welding fixture of the embodiment of the present invention.
It is attached in the figure, it is marked as
1 bar
2 end flanges
3 lock shafts
4 spring gasket rings
5 nuts
6 tube heads
7 tube rods
8 casings
9 plugs
10 air vents
11 tail apical pores
12 boss
13 screw rods
14 protective sleeves
15 auxiliary connecting structures
16 annular grooves
17 gaskets
18 turntables
19 three-jaws
20 tail tops.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
The embodiment of the invention provides a kind of semiclosed tube rod class formation welding fixtures, for semiclosed tube rod class formation
The welding of tube head 6 and tube rod 7, as shown in Figure 8, comprising: casing 8, plug 9, protective sleeve 14, turntable 18, three-jaw 19 and tail top
20.As shown in figure 3, described sleeve pipe 8 is the cylindrical shape with opening, the diameter of internal diameter and the tube head 6 matches, without opposite
It is slidably socketed on the tube head 6.As shown in figure 4, the plug 9 is disc-shaped, the plug 9 has and the tube rod 7
The boss 12 that matches of opening, and be assemblied in by the boss 12 the 6 side opening of separate tube head of the tube rod 7, institute
State the center of plug 9 and the inside side of the tube rod 7 be provided with screw rod 13, the center of the plug 9 towards the tube rod 7 to
Outer side is provided with tail apical pore 11.As shown in figure 5, the protective sleeve 14 be elongated rod shape, be connected on the screw rod 13 and to
The link position of the tube head 6 and tube rod 7 is extended beyond in the tube rod 7, link position herein is position to be welded
It sets.The tail top 20 is connected on the tail apical pore 11, and the turntable 18 is connected in described sleeve pipe 8 by the three-jaw 19.
Preferably, it is additionally provided with air vent 10 on the plug 9, the stomata not only plays degassing in the welding process, but also can
Mitigate the weight of plug.The present invention is devised with opening, the cannula structure that can be clamped, and devises the week of magnetic tape trailer apical pore, air vent
To the plug positioned with end face, the docking of tube head and tube rod is realized, turntable three-jaw clamps, tail top holds out against assembly, protects zero
Part structural outer surface ensure that the axial direction of part and the positioning assembly of end face.Tube rod part internal diameter protective jacket has also been devised simultaneously
Barrel structure assembles the adjustment that protective position can be achieved by screw rod, penetrates the excess energies such as line for absorbing, avoids inner tube
The scaling loss of wall can meet the welding of the pipe component of rod category of different length.
In the one aspect of the embodiment of the present invention, auxiliary is additionally provided among the position of described sleeve pipe 8 and the connection of three-jaw 19
Connection structure 15, the auxiliary connecting structure 15 have the ring to match with the diameter of described sleeve pipe 8 close to 8 side of described sleeve pipe
Shape slot 16, the annular groove 16 is interior to assemble gasket 17, and the pad of gasket 17 is in the end of the tube head.The gasket has bullet
Property, it is arranged at the position of auxiliary connecting structure and tube head cooperation, it can assembly to tube rod and tube head and welding contracted quantity
Adjustment, reduces problems of welded quality caused by welding stress deformation.
In the one aspect of the embodiment of the present invention, the length of the screw rod 13 is 100mm~200mm, the protective sleeve
On 14 with the screw thread distribution length of the screw rod mated position be 100mm~200mm.The present invention claims devices at work,
Protective sleeve will extend into the link position of tube rod and tube head in tube rod, i.e., at pad, it is preferable that protective sleeve will be more than
Weld locations 5mm or more, and the bottom of tube head cannot be touched.The design of reach in this screw rod and protective sleeve,
It can effectively improve retractility of the protective sleeve in tube rod, connect by protective sleeve with screw flight and realize protective sleeve
Stretching in a big way, meets the welding of the tube rod part of different length.
The present invention also provides a kind of assembly methods of semiclosed tube rod class formation welding fixture, as shown in Figure 9, comprising:
Step S10 is socketed on tube head by casing from opening distending, and realizes interference fit；Casing is as three claw clip of turntable
The position of assembly is held, not only ensure that the concentricity of assembly, but also has protected tube rod head.
Protective sleeve screw-in is assembled on the screw rod of plug according to the length of tube rod, guarantees protective sleeve by step S20
Built-in length be more than welding position, and plug is assembled in tube rod by the boss of plug, is filled on the tail apical pore of plug
With tail top；
Step S30, three-jaw is mounted on turntable, by three-jaw gripping sleeve, realizes the positioning assembly of tube head；
Step S40, adjustment make tail top and three-jaw concentric, hold out against plug by tail top, realize the docking of tube head and tube rod；
Step S50, in the two sides of tube head and the docking location of tube rod, using the circular runout of dial gauge measurement tube rod assembly, phase
The angle of assembling that two sides should be adjusted after the completion of adjustment, locks three-jaw and tail top, completes component assembly, prepares welding.
Further, described that three-jaw is mounted on turntable, by three-jaw gripping sleeve, realize the positioning assembly step of tube head
Suddenly, further include assembling auxiliary connecting structure and spring shim on three-jaw, then assemble tube head at the rear portion of gasket.The pad
Piece has elasticity, is arranged at the position of auxiliary connecting structure and tube head cooperation, can assembly and welding to tube rod and tube head
The adjustment of shrinkage reduces problems of welded quality caused by welding stress deformation.
In one particular embodiment of the present invention, with wall thickness 3mm, outer diameter 70mm, the stainless steel tube of total length 1300mm
Bar part is as embodiment, for semi-enclosed tube head 6(length 150mm) it is docked with tube rod 7(1150mm), concrete implementation mistake
Journey are as follows:
One, component determines the stage:
(1) according to closed tube head 6, welding hold assembly is determined, as shown in Figure 3.Casing 8 and tube head 6 are coaxial, internal diameter
For 69.8mm, wall thickness 3mm, be open groove width 3mm, clamps positioning for tube head protection, three-jaw, material is stainless steel.
(2) according to open tube rod 7, plug is determined, as shown in Figure 4.The 12 height 5mm of boss of the plug 9, wall thickness
4mm, air vent 10 diameter 8mm, internal 13 diameter 20mm of connecting screw, length 200mm, it is fixed for the end face of tube rod and circumferential direction
Position, material is stainless steel.
(3) protective sleeve 14 is determined according to the length of tube rod 7, as shown in Figure 5.14 outer diameter 30mm of protective sleeve, total length
For 1140mm；The diameter of its inner hole thread matches with screw rod 13, length 200mm；For the protection of welding process, material is
Stainless steel.
(4) auxiliary connecting structure 15 of gasket 17 is determined, as shown in fig. 6, the internal diameter 71mm of annular groove 16, wall thickness 2mm, ring
The high 5mm of surrounding boss of shape slot, using stainless steel material, the gasket 17 for elasticity provides rigging position.Wherein, gasket 17 is
The copper spring of outer diameter 70mm, thickness 3mm is, it can be achieved that adjustment to tube rod Standard and welding contracted quantity, as shown in Figure 7.
Two, assembling stage:
(5) using screwdriver by casing 8 from opening distending, tube head 6 is clamped into elastic conjunction into inside casing 8.
(6) 14 inner hole thread end of protective sleeve is screwed in and is assembled on the screw rod 13 of plug 9, guarantee that protective sleeve 14 is more than
Welding position 5mm；Tube rod 7 is assembled on the boss 12 of plug 9, realizes end face and the circumferentially positioned assembly of internal diameter of tube rod 7, such as
Shown in Fig. 8.
(7) auxiliary connecting structure 15 and gasket 17 are assembled on the three-jaw 19 of turntable 18, then by tube head 6 in step (5)
Cooperation realizes the positioning assembly of tube head 6, as shown in Figure 8 using 19 gripping sleeve 8 of three-jaw at 17 rear portion of gasket.
(8) adjustment equipment tail top 20 is concentric with three-jaw 19, and the tube rod 7 in Butt Assembling step (6) is held out against by tail top 20
Plug 9 realizes the assembly of part, as shown in Figure 8.
(9) using the circular runout near dial gauge measurement docking location, adjustment assembly angle guarantees that butt-joint clearance is less than
0.1mm, scale are less than 0.1mm, lock three-jaw 19 and tail top 20, complete component assembly, prepare welding.
(10) electron beam welding is carried out for tube head 6 and 7 docking location of tube rod, welding quality meets I grade standard of navigation mark.
The present invention provides a kind of semiclosed tube rod class formation welding fixture and its assembly methods, devise in tube head point
With opening, the cannula structure that can be clamped, the stifled of magnetic tape trailer apical pore, the circumferential direction of air vent and end face positioning is devised in tube rod tail end
Head, by casing, plug assembly in the two sides of jointed tubular workpieces to be welded, it can be achieved that the assemble welding that turntable three-jaw clamps, tail top is held out against, is protected
Design of part outer surface has been protected, ensure that the axial direction of part and the positioning assembly of end face.In tube rod interior design protective sleeve
Structure is assembled on plug the adjustment, it can be achieved that protective position by screw rod, penetrates line excess energy for absorbing, avoids
The scaling loss of inner tubal wall, can meet the welding of the tube rod of different length.Auxiliary is devised in the cooperation position of casing and three-jaw to connect
Binding structure provides rigging position for elastomeric pad, realizes component assembly and the adjustment of welding contracted quantity, reduces welding and answers
Problems of welded quality caused by power deformation.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (6)
1. a kind of semiclosed tube rod class formation welding fixture, for the tube head of semiclosed tube rod class formation and the welding of tube rod,
It is characterized in that, comprising:
Casing, plug, protective sleeve, turntable, three-jaw and tail top；
Described sleeve pipe is the cylindrical shape with opening, and the diameter of internal diameter and the tube head matches, and nothing is slidably socketed relatively
On the tube head；The plug is disc-shaped, and the plug has the boss to match with the opening of the tube rod, and passes through
The boss is assemblied in the separate tube head side opening of the tube rod, and the center of the plug is towards the inside side of the tube rod
It is provided with screw rod, the center of the plug is provided with tail apical pore towards the outside side of the tube rod；The protective sleeve is stock
Shape is connected on the screw rod and extends beyond into the tube rod link position of the tube head and tube rod, the tail top
It is connected on the tail apical pore, the turntable is connected in described sleeve pipe by the three-jaw.
2. a kind of semiclosed tube rod class formation welding fixture as described in claim 1, which is characterized in that also set on the plug
It is equipped with air vent.
3. a kind of semiclosed tube rod class formation welding fixture as described in claim 1, which is characterized in that described sleeve pipe and three-jaw
Be additionally provided with auxiliary connecting structure among the position of connection, the auxiliary connecting structure close to described sleeve pipe side have with it is described
The annular groove that the diameter of casing matches, the annular groove is interior to assemble gasket, and the gasket pad is in the end of the tube head.
4. a kind of semiclosed tube rod class formation welding fixture as described in claim 1, which is characterized in that the length of the screw rod
For 100mm~200mm, be with the screw thread distribution length of the screw rod mated position on the protective sleeve 100mm~
200mm。
5. a kind of assembly method of semiclosed tube rod class formation welding fixture characterized by comprising
It by casing from opening distending, is socketed on tube head, and realizes interference fit；
According to the length of tube rod, protective sleeve screw-in is assembled on the screw rod of plug, guarantees that the built-in length of protective sleeve is super
Welding position is crossed, and plug is assembled in tube rod by the boss of plug, tail top is assembled on the tail apical pore of plug；
Three-jaw is mounted on turntable, by three-jaw gripping sleeve, realizes the positioning assembly of tube head；
Adjustment makes tail top and three-jaw concentric, holds out against plug by tail top, realizes the docking of tube head and tube rod；
Two are accordingly adjusted using the circular runout of dial gauge measurement tube rod assembly in the two sides of tube head and the docking location of tube rod
The angle of assembling of side after the completion of adjustment, locks three-jaw and tail top, completes component assembly, prepares welding.
6. a kind of assembly method of semiclosed tube rod class formation welding fixture as claimed in claim 4, which is characterized in that described
Three-jaw is mounted on turntable, by three-jaw gripping sleeve, realizes the positioning installation step of tube head, further includes:
Auxiliary connecting structure and spring shim are assembled on three-jaw, then assemble tube head at the rear portion of gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728793.2A CN109202344B (en) | 2017-08-23 | 2017-08-23 | Semi-closed pipe rod structure welding clamp and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710728793.2A CN109202344B (en) | 2017-08-23 | 2017-08-23 | Semi-closed pipe rod structure welding clamp and assembling method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109202344A true CN109202344A (en) | 2019-01-15 |
| CN109202344B CN109202344B (en) | 2020-11-10 |
Family
ID=64991403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710728793.2A Active CN109202344B (en) | 2017-08-23 | 2017-08-23 | Semi-closed pipe rod structure welding clamp and assembling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109202344B (en) |
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| CN111496365A (en) * | 2020-04-02 | 2020-08-07 | 上海新力动力设备研究所 | Solid rocket engine shell assembly welding tool with embedded end cover |
| CN111728662A (en) * | 2020-06-28 | 2020-10-02 | 合肥工业大学 | Clamping mechanism for laser drilling of artificial soft artery stent and method thereof |
| CN112743207A (en) * | 2020-12-25 | 2021-05-04 | 北京七星华创流量计有限公司 | Semi-closed welding protection device for to-be-welded part |
| CN116652352A (en) * | 2023-07-28 | 2023-08-29 | 中国航空制造技术研究院 | Electron beam welding clamping tool and welding method for aviation pull rod structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111728662A (en) * | 2020-06-28 | 2020-10-02 | 合肥工业大学 | Clamping mechanism for laser drilling of artificial soft artery stent and method thereof |
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| CN116652352A (en) * | 2023-07-28 | 2023-08-29 | 中国航空制造技术研究院 | Electron beam welding clamping tool and welding method for aviation pull rod structure |
| CN116652352B (en) * | 2023-07-28 | 2023-10-20 | 中国航空制造技术研究院 | Electron beam welding clamping tool and welding method for aviation pull rod structure |
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| Publication number | Publication date |
|---|---|
| CN109202344B (en) | 2020-11-10 |
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