CN108723738B - High-precision automatic bolt and bracket piece assembling and feeding device - Google Patents
High-precision automatic bolt and bracket piece assembling and feeding device Download PDFInfo
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- CN108723738B CN108723738B CN201810815462.7A CN201810815462A CN108723738B CN 108723738 B CN108723738 B CN 108723738B CN 201810815462 A CN201810815462 A CN 201810815462A CN 108723738 B CN108723738 B CN 108723738B
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- 238000004519 manufacturing process Methods 0.000 abstract description 9
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- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- 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
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
-
- 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
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
The invention provides a high-precision automatic bolt and bracket piece assembling and feeding device, which comprises a machine table, a bracket piece taking device, a bolt taking device, a general assembly taking device, a vibrating disc, a direct vibrator, a touch screen and an electric cabinet; the connection relation is that the bracket sheet material taking device, the bolt material taking device, the assembly material taking device, the vibration disc, the direct vibrator, the touch screen and the electric cabinet are connected with the machine; the bracket sheet material taking device, the bolt material taking device, the assembly material taking device, the vibration disc, the direct vibrator and the touch screen are respectively and electrically connected with the electric cabinet; the bracket sheet taking device comprises a first cylinder, a stacking block, a taking in-place inductor and a stacking block placing table. The device of the application is capable of automatically taking materials and assembling, replaces manual production, and is reliable in structure, high in performance, convenient to use, easy to maintain, safe in production and capable of improving market competitiveness of enterprises.
Description
Technical Field
The invention relates to an automatic assembly feeding device, in particular to a high-precision automatic assembly feeding device for bolts and bracket pieces.
Background
With the development of technology and the progress of technology, automobile products are more and more different day by day, and higher requirements are also put on fastener products, and automobile parts are important fields of the automobile industry in China to participate in globalization. In the fastener processing, in the riveting process of the bolt and the bracket piece, after the assembly of the bolt and the bracket piece is needed to be completed manually, the assembled part is put into a punching riveting jig manually, and then the punching machine is started manually to complete the riveting of the bolt and the bracket; the work done manually causes high labor intensity of workers, low efficiency and certain potential safety hazard.
The assembly riveting process in the prior art is manually assembled, fed and started, so that personnel injury is often caused carelessly, and the labor hour cost is high. Thus, the prior art has a place to improve.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a high-precision automatic bolt and bracket piece assembling and feeding device so as to solve the technical problem of the existing manual riveting bolt.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a high-precision automatic bolt and bracket piece assembling and feeding device comprises a machine table, a bracket piece taking device, a bolt taking device, a total assembling and taking device, a vibration disc, a direct vibrator, a touch screen and an electric cabinet. The connection relation is that the bolt material taking device, the bracket sheet material taking device, the assembly material taking device, the vibration disc, the direct vibrator, the touch screen and the electric cabinet are connected with the machine; the bolt material taking device, the bracket sheet material taking device, the assembly material taking device, the vibration disc, the direct vibrator and the touch screen are respectively and electrically connected with the electric cabinet; the bracket piece extracting device comprises: a stack of material blocks, a first cylinder, a material taking block, a material taking and positioning sensor and a stack of material block placing table; the stacking material blocks are long square bodies with cavities, and are connected with the stacking material block placing table; the material taking block is connected with the first air cylinder, and the first air cylinder is connected with the machine; the material taking in-place sensor is assembled and connected with the machine; the stacking block placing table is a plane body and is connected with the machine table, and one side, facing the material taking block, of the stacking block placing table is connected with the stacking block; the other side of the stacking block placing table is provided with a bracket piece groove and an inductor notch.
The high-precision bolt and bracket piece automatic assembly feeding device comprises a material taking installation seat, a second cylinder, a third cylinder, a fourth cylinder and a bolt feeding block; the fourth cylinder is connected with the third cylinder, the third cylinder is connected with the second cylinder, the second cylinder is connected with the material taking mounting seat, and the material taking mounting seat is connected with the machine; the bolt feeding block is assembled and connected with the machine table.
The high-precision bolt and bracket piece automatic assembly feeding device of the preferred embodiment of the application, the assembly taking device comprises an assembly installation seat, a fifth cylinder, a sixth cylinder and a second seventh cylinder, wherein the seventh cylinder is connected with the sixth cylinder, the sixth cylinder is connected with the fifth cylinder, the fifth cylinder is connected with the assembly installation seat, and the assembly installation seat is connected with the machine table.
The high-precision bolt and bracket piece automatic assembly feeding device of the preferred embodiment of the application further comprises a seventh cylinder connecting block, wherein the seventh cylinder connecting block comprises two blocks, one block is used for connecting a sixth cylinder, and the other block is used for connecting the two seventh cylinders.
The high-precision bolt and bracket piece automatic assembly feeding device of the preferred embodiment of the application further comprises a bolt anti-falling block, the bolt anti-falling block is connected with the seventh cylinder, and the bolt anti-falling block comprises an elastic pin.
The design theory of this application is, designs a device that can full-automatic high accuracy bolt and support piece equipment pay-off, replaces the manual work, reaches safety in production, saves man-hour reduce cost, improves enterprise market competition.
Due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:
first, the full-automatic production of this application, the speed is improved, a piece of equipment can replace two people, reduce the emergence of the industrial injury;
secondly, the automatic blanking improves the production efficiency and reduces the labor intensity of staff;
thirdly, this application structure is reliable, convenient to use, and it is easy to maintain, and the commonality is strong, reaches safety in production, improves enterprise's market competition.
Of course, it is not necessary for any one embodiment to practice the teachings of the present invention to have all of the above described advantages.
Drawings
FIG. 1 is a schematic illustration of electrical connections of the present application;
FIG. 2 is a schematic illustration of the mechanical connection of the present application;
FIG. 3 is a schematic structural view of the present application;
FIG. 4 is a schematic view of a stent sheet take-off device of the present application;
FIG. 5 is a schematic view of a bolt take-off device of the present application;
fig. 6 is a schematic view of a general assembly reclaimer device of the present application.
Detailed Description
Several preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention. In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details. In other instances, well-known methods, procedures, flows, components, and so forth have not been described in detail so as not to unnecessarily obscure aspects of the present invention.
Referring to fig. 1 and 2, a high-precision bolt and bracket sheet assembling and feeding device comprises a vibrator 10, a vibration disc 20, a general assembly material taking device 30, a bolt material taking device 40, a bracket sheet material taking device 50, an electric cabinet 60, a machine table 70 and a touch screen 80, wherein the connection relationship is that the vibrator 10, the vibration disc 20, the general assembly material taking device 30, the bolt material taking device 40, the bracket sheet material taking device 50, the electric cabinet 60 and the touch screen 80 are connected with the machine table 70; the direct vibrator 10, the vibration plate 20, the assembly material taking device 30, the bolt material taking device 40, the bracket sheet material taking device 50 and the touch screen 80 are respectively and electrically connected with the electric cabinet 60; referring to fig. 3, as shown, the vibrator 10 is connected to the tail of the vibration plate 20 for assisting the movement of the bolts; the number of the vibrator 10 and the vibration plate 20 is two in the drawings, but the bolts assembled by the bracket pieces are one in the embodiment of the present application, so the embodiment only illustrates a device assembled by one bolt.
Wherein, as shown in fig. 3 and 4, the bracket sheet extracting device 50 comprises a first cylinder 501, an extracting block 502, a stack of blocks 503, an extracting and positioning sensor 504 and a stack of block placing tables 505; the first air cylinder 501 is connected with the material taking block 502, and the first air cylinder 501 is connected with the machine 70; the stacking blocks 503 are connected with the stacking block placing table 505, the material taking in-place sensor 504 is assembled and connected with the machine table 70, and the material taking in-place sensor 504 is electrically connected with the electric cabinet 60; the stacking block 503 is a rectangular square body with a cavity, the cavity is processed and formed according to the shape of the bracket sheet and has fool-proof function, the stacking block 503 is connected with the stacking block placing table 505, as shown in fig. 4, a notch is formed on one side of the stacking block 503 facing the taking block 502, so that the taking block 502 can be conveniently moved in and out, and the number of the bracket sheets can be conveniently watched; the stacking block placing table 505 is a plane body, the stacking block placing table 505 is connected to the machine table 70, and a side of the stacking block placing table 505 facing the material taking block 502 is connected to the stacking block 503; the other side of the stacking block placing table 505 is provided with a bracket piece groove 506 and an inductor notch 507.
As shown in fig. 4, the material taking block 502 is a plane body, and the material taking block 502 and the first cylinder 501 are connected by adopting a way of a guide rail and a guide rail groove so as to ensure the moving smoothness and stability of the material taking block 502, so that a set number of bracket pieces can be pushed out each time the material taking block 502 enters and exits; in addition, the material taking in-place sensor 504 is arranged in the sensor notch 507, the material taking in-place sensor 504 is also in the range of the bracket piece groove 506, the height of the material taking in-place sensor 504 is lower, and when the bracket piece is pushed into the bracket piece groove 506 by the material taking block 502, the bottom surface of the bracket piece cannot touch the material taking in-place sensor 504, and the damage of the material taking in-place sensor 504 cannot be caused; of course, the feeding position sensor 504 may be disposed on the upper downward sensing bracket, and thus should not be used to limit the present application, so long as the stable sensing bracket should be the protection scope of the present application.
In addition, as shown in fig. 3 and 5, the bolt taking device 40 includes a second cylinder 401, a third cylinder 402, a fourth cylinder 403, a taking mounting base 404, a third cylinder connecting block 405, a fourth gas connecting block 406 and a bolt feeding block 407; the connection is as follows: the material taking mounting seat 404 is connected with the machine table 70, and the second air cylinder 401 is connected with the material taking mounting seat 404; the third cylinder is connected with the second cylinder in such a way that the third cylinder connecting block 405 is connected with the second cylinder 401, and the third cylinder 402 is connected with the third cylinder connecting block 405; the fourth cylinder is connected to the third cylinder in such a manner that the fourth cylinder connection block 406 is connected to the material taking third cylinder 402, and the fourth cylinder 403 is connected to the fourth cylinder connection block 406; the bolt feeding block 407 is assembled and connected with the machine table 70, and the bolt feeding block 407 is positioned at the tail end of the vibration disk and is used for placing bolts transmitted from the vibration disk.
Next, the operation of the screw extracting device 40 will be described, as shown in fig. 5, the second cylinder 401 is located at the rightmost side, and the second cylinder 401 is moved left and right, so that when the second cylinder 401 is extended, the third cylinder 402 can be pushed to the left; the third cylinder 402 moves up and down, so that the fourth cylinder 403 can be pushed down when the third cylinder 402 is extended; the fourth cylinder 403 is connected to the clamping mechanism, and is used for clamping the bolt in the bolt feeding block 407, when the fourth cylinder 403 descends for the first time, the fourth cylinder 403 descends for the second time after the bolt in the bolt feeding block 407 is conveyed in place, the bolt is inserted into the hole of the bracket piece, and then the bolt is released to complete the automatic assembly.
As shown in fig. 3 and 6, the total loading and unloading device 30 includes a total loading and unloading seat 301, a fifth cylinder 302, a sixth cylinder 303, a seventh cylinder connecting block 304, two seventh cylinders 305, and two bolt anti-falling blocks 306; the assembly mounting seat 301 is connected with the machine table 70, the fifth air cylinder 302 is connected with the assembly mounting seat 301, the sixth air cylinder 303 is connected with the fifth air cylinder 302, the seventh air cylinder connecting block 304 is connected with the sixth air cylinder 303, the seventh air cylinder 305 is connected with the seventh air cylinder connecting block 304, and the bolt anti-drop block 306 is connected with the seventh air cylinder 305. As shown in fig. 6, the seventh cylinder connecting block 304 includes two blocks, one for connecting the sixth cylinder 303 and the other for connecting the two seventh cylinders 305, the two seventh cylinders 305 are assembled separately, and the distance between the two seventh cylinders 305 matches the stroke of the fifth cylinder 302 and the distance between the seventh cylinder 305 on the left and the bracket piece groove 506.
In this embodiment, as shown in fig. 6, the bolt anti-falling block 306 is an elastic pin, that is, a spring ejects the pin, when the pin encounters the bolt, the pin is pressed by the bolt to be immersed into the box body of the bolt anti-falling block 306, when the seventh cylinder 305 is released and moves upwards, the position of the bolt changes, the pin continuously abuts against the bolt under the action of elastic force, and the bolt can be stably inserted into the hole of the bracket piece.
Next, the operation of the total feeding and discharging device 30 will be described, as shown in fig. 6, the fifth cylinder 302 is located at the top, the fifth cylinder 302 drives the sixth cylinder 303 to move left and right, and when the material is to be discharged, the fifth cylinder 302 drives the sixth cylinder 303 to move left; after the positioning is achieved, the sixth air cylinder 303 moves downwards to drive the seventh air cylinder connecting block 304 to drive the seventh air cylinder 305 to move downwards, when the positioning is achieved, the seventh air cylinder 305 on the left grabs the bracket piece, and the bolt anti-falling block 306 butts against the bolt; next, the sixth cylinder 303 moves upward to drive the seventh cylinder connecting block 304 to link the seventh cylinder 305 to move upward, and at this time, the bracket piece and the bolt in the bracket piece groove 506 are carried by the seventh cylinder 305 to move together; then, the fifth cylinder 302 drives the sixth cylinder 303 to move rightward; after the positioning is achieved, the sixth air cylinder 303 moves downwards to drive the seventh air cylinder connecting block 304 to drive the seventh air cylinder 305 to move downwards, and when the positioning is in place, the seventh air cylinder 305 releases the bracket piece to finish the primary bracket piece conveying. When the above-mentioned total assembly and material taking process is performed again, the seventh cylinder 305 on the left is connected with the bracket piece, and the bolt anti-falling block 306 abuts against the bolt, the seventh cylinder 305 on the right grabs the bracket piece that is primarily carried, and the bolt anti-falling block 306 abuts against the bolt, and when the fifth cylinder 302 drives the sixth cylinder 303 to move rightward, the seventh cylinder 305 on the right brings the bracket piece that is primarily carried and the bolt to the next process.
The process flow of the present application includes,
1. and (3) taking a bracket sheet: manually placing a bracket piece into a stacking block, pouring a bolt into the vibration disc 20, starting the first cylinder 501 to act, and conveying the bracket piece to the position of the material taking in-place sensor 504, wherein the material taking in-place sensor 504 senses the position, and the bolt taking device 40 to act;
2. bolt material taking: the material taking in-place sensor 504 senses the action of the third cylinder 402 in the place, the action of the fourth cylinder 403 in the place, the action of the third cylinder 402 in the place, the action of the second cylinder 401 in the place, the action of the material taking action in the place is completed in the place, and the next starting signal is waited;
3. and (3) final assembly material taking: the bolt taking action is completed, the fifth air cylinder 302 is in place, the sixth air cylinder 303 is in place, the seventh air cylinder 305 is in place, the sixth air cylinder 303 is in place in clamping, the fifth air cylinder 302 is in place in retracting, the first air cylinder 501 is in place in retracting, the sixth air cylinder 303 is in place in extending, the seventh air cylinder 305 is in place in retracting, the sixth air cylinder 303 is in place in opening, and the feeding action is completed once in retracting.
In summary, due to the adoption of the technical characteristics, compared with the prior art, the invention has the following advantages and positive effects:
first, the full-automatic production of this application, the speed is improved, a piece of equipment can replace two people, reduce the emergence of the industrial injury;
secondly, the automatic blanking improves the production efficiency and reduces the labor intensity of staff;
thirdly, this application structure is reliable, convenient to use, and it is easy to maintain, and the commonality is strong, reaches safety in production, improves enterprise's market competition.
The preferred embodiments of the invention are provided only to help illustrate the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof. The foregoing description of the preferred embodiments of the present invention is provided for illustration only, and is not intended to be limiting, since various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (4)
1. The high-precision automatic bolt and bracket piece assembling and feeding device is characterized by comprising a machine table, a bracket piece taking device, a bolt taking device, a total assembling and taking device, a vibration disc, a direct vibrator, a touch screen and an electric cabinet; the connection relation is that the bolt material taking device, the bracket sheet material taking device, the assembly material taking device, the vibration disc, the direct vibrator, the touch screen and the electric cabinet are connected with the machine; the bolt material taking device, the bracket sheet material taking device, the assembly material taking device, the vibration disc, the direct vibrator and the touch screen are respectively and electrically connected with the electric cabinet; the bracket piece extracting device comprises: a stack of material blocks, a first cylinder, a material taking block, a material taking and positioning sensor and a stack of material block placing table; wherein,
the stacking material blocks are long square bodies with cavities, and the stacking material blocks are connected with the stacking material block placing table;
the material taking block is connected with the first air cylinder, the material taking block is a plane body, the material taking block is connected with the first air cylinder in a mode of adopting a guide rail and a guide rail groove, and the first air cylinder is connected with the machine table;
the material taking in-place sensor is assembled and connected with the machine;
the stacking block placing table is a plane body and is connected with the machine table, and one side, facing the material taking block, of the stacking block placing table is connected with the stacking block; the other side of the stacking block placing table is provided with a bracket piece groove and an inductor notch;
the total assembly material taking device comprises two seventh air cylinders and two bolt anti-falling blocks, the bolt anti-falling blocks are connected with the seventh air cylinders, the seventh air cylinders grab bracket pieces, and the bolt anti-falling blocks prop against bolts; specifically, the bolt anti-falling block comprises an elastic pin, the pin is ejected out by a spring, and when the pin meets the bolt, the pin is extruded by the bolt to be immersed into the box body of the bolt anti-falling block.
2. The high precision bolt and bracket piece automatic assembly feeding device of claim 1, further characterized in that the bolt take-out device comprises a take-out mount, a second cylinder, a third cylinder, a fourth cylinder and a bolt feed block; the fourth cylinder is connected with the third cylinder, the third cylinder is connected with the second cylinder, the second cylinder is connected with the material taking mounting seat, and the material taking mounting seat is connected with the machine; the bolt feeding block is assembled and connected with the machine table.
3. The automatic assembly and feeding device for high-precision bolts and bracket pieces according to claim 1, further characterized in that the assembly and feeding device further comprises an assembly mounting seat, a fifth cylinder and a sixth cylinder, wherein the seventh cylinder is connected with the sixth cylinder, the sixth cylinder is connected with the fifth cylinder, the fifth cylinder is connected with the assembly mounting seat, and the assembly mounting seat is connected with the machine.
4. The high-precision bolt and bracket piece automatic assembly feeding device of claim 3, further characterized by a seventh cylinder connecting block, wherein the seventh cylinder connecting block comprises two blocks, one block is used for connecting a sixth cylinder, and the other block is used for connecting the two seventh cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815462.7A CN108723738B (en) | 2018-07-24 | 2018-07-24 | High-precision automatic bolt and bracket piece assembling and feeding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810815462.7A CN108723738B (en) | 2018-07-24 | 2018-07-24 | High-precision automatic bolt and bracket piece assembling and feeding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108723738A CN108723738A (en) | 2018-11-02 |
| CN108723738B true CN108723738B (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810815462.7A Active CN108723738B (en) | 2018-07-24 | 2018-07-24 | High-precision automatic bolt and bracket piece assembling and feeding device |
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| Country | Link |
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| CN (1) | CN108723738B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02124279A (en) * | 1988-11-01 | 1990-05-11 | Makita Electric Works Ltd | Motor screw driver |
| JPH09245512A (en) * | 1996-03-07 | 1997-09-19 | Toshiba Lighting & Technol Corp | Luminaire |
| CN105364469A (en) * | 2015-11-30 | 2016-03-02 | 深圳市威富多媒体有限公司 | Automatic screw assembling machine and screw and nut locking device |
| CN106624692A (en) * | 2016-11-16 | 2017-05-10 | 苏州冠浩斯精密机械有限公司 | Nut discharging device of electromagnetic valve part assembling machine |
| CN107612236A (en) * | 2017-09-30 | 2018-01-19 | 横店集团英洛华电气有限公司 | Electric motor end cap and bearing automatic press mounting device |
| CN208800983U (en) * | 2018-07-24 | 2019-04-30 | 浙江长华汽车零部件股份有限公司 | High-precision bolt and rack plate assemble feed device automatically |
-
2018
- 2018-07-24 CN CN201810815462.7A patent/CN108723738B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02124279A (en) * | 1988-11-01 | 1990-05-11 | Makita Electric Works Ltd | Motor screw driver |
| JPH09245512A (en) * | 1996-03-07 | 1997-09-19 | Toshiba Lighting & Technol Corp | Luminaire |
| CN105364469A (en) * | 2015-11-30 | 2016-03-02 | 深圳市威富多媒体有限公司 | Automatic screw assembling machine and screw and nut locking device |
| CN106624692A (en) * | 2016-11-16 | 2017-05-10 | 苏州冠浩斯精密机械有限公司 | Nut discharging device of electromagnetic valve part assembling machine |
| CN107612236A (en) * | 2017-09-30 | 2018-01-19 | 横店集团英洛华电气有限公司 | Electric motor end cap and bearing automatic press mounting device |
| CN208800983U (en) * | 2018-07-24 | 2019-04-30 | 浙江长华汽车零部件股份有限公司 | High-precision bolt and rack plate assemble feed device automatically |
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| Publication number | Publication date |
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| CN108723738A (en) | 2018-11-02 |
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