CN110605518A - Bushing clamping mechanism for automatic welding of automobile seat bushing - Google Patents
Bushing clamping mechanism for automatic welding of automobile seat bushing Download PDFInfo
- Publication number
- CN110605518A CN110605518A CN201910952378.4A CN201910952378A CN110605518A CN 110605518 A CN110605518 A CN 110605518A CN 201910952378 A CN201910952378 A CN 201910952378A CN 110605518 A CN110605518 A CN 110605518A
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- China
- Prior art keywords
- sliding
- bushing
- clamping mechanism
- bottom plate
- face
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention provides a bushing clamping mechanism for automatically welding a bushing of an automobile seat, which comprises an L-shaped workbench, wherein a welding device supporting table is arranged on the rear side of the right end face of the L-shaped workbench, and a welding device is arranged on the upper part of the welding device supporting table; the upper part of each sliding bottom plate is provided with four clamping mechanisms, and the upper part of each clamping mechanism is provided with one bushing; and one bushing adjusting device is rotatably connected inside each clamping mechanism. The sliding bottom plate is connected to the upper portion of the sliding rail in a sliding mode, the two sliding rails are installed on the front side and the rear side of the upper end face of the L-shaped workbench respectively, and the upper portion of the L-shaped workbench forms two mutually-noninterference sliding ways, so that a bush on a clamping mechanism on one sliding bottom plate can be clamped in advance while a bush on a clamping mechanism on the other sliding bottom plate is welded, and the working efficiency of bush welding is greatly improved.
Description
Technical Field
The invention belongs to the technical field of bushing processing, and particularly relates to a bushing clamping mechanism for automatically welding a bushing of an automobile seat.
Background
The lining is a matching part used outside mechanical parts to achieve the functions of sealing, wear protection and the like, and is a ring sleeve playing the role of a gasket. In the moving parts, parts are worn due to long-term friction, and the parts must be replaced when the clearance between the shaft and the hole is worn to a certain degree, so that a designer selects a material with lower hardness and better wear resistance as a shaft sleeve or a bushing at the time of design, thereby reducing the wear of the shaft and the seat.
As in application No.: 201420524845.6 the invention discloses a bush clamping mechanism of an automatic bush welding machine, which comprises a bush bearing plate with a placing groove, a bush clamping cylinder, a V-shaped groove bush clamping die and a bush in-place sensor, wherein the bush bearing plate with the placing groove is provided with the bush clamping cylinder, a piston flange plate of the bush clamping cylinder is arranged rightwards, the piston flange plate of the bush clamping cylinder is provided with the V-shaped groove bush clamping die, the V-shaped groove of the V-shaped groove bush clamping die faces the right side, and the right side surface of the bush bearing plate with the placing groove is provided with the bush in-place sensor. Through the mode, the automatic blanking device can replace workers to carry out rapid welding, is high in efficiency and yield, and can automatically blank a finished frame after welding.
Based on the above patent search, and in conjunction with the prior art device discovery, automotive seat bushing gaps are typically completed with the assistance of a clamping mechanism during automated welding. The existing bushing clamping mechanism has the following defects in the actual use process, such as: 1. the existing bushing clamping mechanism cannot move after being installed on a workbench, and a next batch of bushings to be welded cannot be clamped in advance in the process of welding the batch of bushings, so that after the batch of bushings are welded, the welded bushings need to be taken down firstly and then placed on the bushing clamping mechanism, and the working efficiency of bushing welding is greatly influenced; 2. when the lining is placed on the lining clamping mechanism, the phenomenon that the gaps of the lining are not aligned easily occurs, the welding quality of the lining is finally influenced, workers can only manually adjust the lining with the gaps not aligned, and the lining welding machine is low in accuracy and not convenient enough in adjustment.
Disclosure of Invention
The invention aims to provide a bush clamping mechanism for automatically welding a bush of an automobile seat, which solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a bush clamping mechanism for automatically welding a car seat bush comprises an L-shaped workbench, wherein a welding device supporting table is arranged on the rear side of the right end face of the L-shaped workbench, and a welding device is arranged on the upper portion of the welding device supporting table; the front side and the rear side of the upper end surface of the L-shaped workbench are symmetrically provided with two sliding rails, and the upper parts of the two sliding rails on the front side and the two sliding rails on the rear side are connected with one sliding bottom plate in a sliding manner; the upper part of each sliding bottom plate is provided with four clamping mechanisms, and the upper part of each clamping mechanism is provided with one bushing; and one bushing adjusting device is rotatably connected inside each clamping mechanism.
Furthermore, the sliding rail further comprises a T-shaped sliding groove and a limiting block, the T-shaped sliding groove is formed in the upper end face of the sliding rail, and the limiting block is installed at the opening end of the T-shaped sliding groove formed in the upper end face of the sliding rail.
Furthermore, the sliding bottom plate further comprises a handle, supporting blocks and T-shaped sliding blocks, the handle is fixedly connected to the first side of the upper end face of the sliding bottom plate, the two T-shaped sliding blocks are fixedly connected to the bottom end face of the sliding bottom plate in a symmetrical mode, and the two supporting blocks are fixedly connected to the upper end face of the sliding bottom plate in a symmetrical mode.
Further, clamping mechanism still includes L type base, places recess, rectangle opening, circular through-hole, die clamping cylinder, clamp splice and aligns the sighting rod, L type base fixed connection is at the supporting shoe up end, and L type base middle part up end has seted up and has placed the recess, it has seted up the rectangle opening to place the inside bottom face of recess, L type base right-hand member face rear side is seted up and is run through two of rectangle opening circular through-hole, and L type base middle part up end installs die clamping cylinder, die clamping cylinder has the clamp splice through sliding column sliding connection, it aligns the sighting rod to place the inside bottom face left side fixedly connected with of recess.
Further, bush adjusting device still includes adjusting handle, driving shaft, driven shaft, belt and annular groove, driving shaft and driven shaft all rotate through the pivot and connect inside circular through-hole, and driving shaft left side pivot left end face fixedly connected with adjusting handle, one has all been seted up at driving shaft and driven shaft outer peripheral face middle part annular groove, and the annular groove that the annular groove of seting up at driving shaft outer peripheral face middle part and driven shaft outer peripheral face middle part were seted up is connected through belt transmission, the bush has been placed at belt up end middle part, and belt up end length direction central line aligns with alignment sighting rod up end length direction central line.
Furthermore, T type slider sliding connection is inside T type spout, and T type slider length accounts for one fifth of sliding bottom plate length.
Furthermore, the outer peripheral surface of the adjusting hand wheel is provided with anti-skid stripes, and the diameter of the adjusting hand wheel is two times to three times of the diameter of the driving shaft and the driven shaft.
Compared with the prior art, the invention has the following beneficial effects:
the sliding bottom plate is connected to the upper portion of the sliding rail in a sliding mode, the two sliding rails are installed on the front side and the rear side of the upper end face of the L-shaped workbench respectively, and the upper portion of the L-shaped workbench forms two mutually-noninterference sliding ways, so that a bush on a clamping mechanism on one sliding bottom plate can be clamped in advance while a bush on a clamping mechanism on the other sliding bottom plate is welded, and the working efficiency of bush welding is greatly improved.
The bush adjusting device rotates and connects inside clamping mechanism, through with driving shaft left side pivot left end face fixedly connected with adjusting handle, make the bush of placing at belt up end middle part if take place the gap unalignment phenomenon, the accessible rotates adjusting handle, drive the belt and carry out the transmission, thereby make the bush of placing at belt up end middle part follow to rotate, after the bush gap aligns, the stall adjusting handle can, the precision when having improved the bush regulation, thereby it is more convenient when making the bush regulation.
Drawings
Fig. 1 is a schematic axial view of the present invention.
Fig. 2 is a schematic axial view of the clamping mechanism of the present invention.
Fig. 3 is a schematic axial view of the L-shaped base and bushing adjustment device of the present invention.
Fig. 4 is a schematic axial view of the bushing adjusting device of the present invention.
Fig. 5 is an axial view of the sliding bottom plate of the present invention.
FIG. 6 is an axial view of the L-shaped table of the present invention.
In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:
1. an L-shaped workbench; 2. a welding device support table; 3. a sliding track; 301. a T-shaped chute; 302. a limiting block; 4. a sliding bottom plate; 401. a handle; 402. a support block; 403. a T-shaped slider; 5. a clamping mechanism; 501. an L-shaped base; 502. placing a groove; 503. a rectangular through opening; 504. a circular through hole; 505. a clamping cylinder; 506. a clamping block; 507. aligning the marker post; 6. a bushing adjusting device; 601. adjusting a hand wheel; 602. a drive shaft; 603. a driven shaft; 604. a belt; 605. an annular groove; 7. a bushing.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
as shown in figures 1 to 6:
the invention provides a bush clamping mechanism for automatically welding a car seat bush, which comprises an L-shaped workbench 1, wherein a welding device supporting table 2 is arranged on the rear side of the right end face of the L-shaped workbench 1, and a welding device is arranged on the upper part of the welding device supporting table 2; two sliding rails 3 are symmetrically arranged on the front side and the rear side of the upper end surface of the L-shaped workbench 1, as shown in figure 6, and the upper parts of the two sliding rails 3 on the front side and the two sliding rails 3 on the rear side are both connected with a sliding bottom plate 4 in a sliding manner, as shown in figure 1; the upper part of each sliding bottom plate 4 is provided with four clamping mechanisms 5, and the upper part of each clamping mechanism 5 is provided with a bush 7; a bushing adjusting device 6 is rotatably connected inside each clamping mechanism 5, as shown in fig. 3.
The sliding rail 3 further comprises a T-shaped sliding groove 301 and a limiting block 302, the T-shaped sliding groove 301 is formed in the upper end face of the sliding rail 3, as shown in fig. 6, the limiting block 302 is installed at the opening end of the T-shaped sliding groove 301 formed in the upper end face of the sliding rail 3, so that the sliding bottom plate 4 is not prone to derailing when sliding on the upper end of the sliding rail 3, and stability of the sliding bottom plate 4 when sliding on the sliding rail 3 is improved.
The sliding bottom plate 4 further comprises a handle 401, a supporting block 402 and a T-shaped slider 403, the handle 401 is fixedly connected to the upper end face of the sliding bottom plate 4, so that the sliding bottom plate 4 can slide manually more conveniently, the two T-shaped sliders 403 are fixedly connected to the bottom end face of the sliding bottom plate 4 symmetrically, and the two supporting blocks 402 are fixedly connected to the upper end face of the sliding bottom plate 4 symmetrically as shown in fig. 5.
Wherein, clamping mechanism 5 still includes L type base 501, place recess 502, rectangle opening 503, circular through-hole 504, die clamping cylinder 505, clamp splice 506 and alignment mark pole 507, L type base 501 fixed connection is in supporting shoe 402 up end, and L type base 501 middle part up end has seted up and has placed recess 502, it has seted up rectangle opening 503 to place the inside bottom face of recess 502, two circular through-holes 504 that run through rectangle opening 503 are seted up to L type base 501 right side terminal surface rear side, as shown in fig. 2, and L type base 501 middle part up end installs die clamping cylinder 505, die clamping cylinder 505 has clamp splice 506 through sliding column sliding connection, through die clamping cylinder 505, make clamp splice 506 more firm when clamping bush 7, and it is more convenient when clamping bush 7, it has alignment mark pole 507 to place the inside bottom face left side fixedly connected with of recess 502, as shown in fig. 2.
Wherein, the bush adjusting device 6 also comprises an adjusting hand wheel 601, a driving shaft 602, a driven shaft 603, a belt 604 and an annular groove 605, the driving shaft 602 and the driven shaft 603 are rotatably connected inside the circular through hole 504 through rotating shafts, and the left end face of the rotating shaft on the left side of the driving shaft 602 is fixedly connected with the adjusting hand wheel 601, as shown in figure 3, the middle parts of the outer peripheral surfaces of the driving shaft 602 and the driven shaft 603 are respectively provided with the annular groove 605, and the annular groove 605 arranged in the middle part of the outer peripheral surface of the driving shaft 602 is in transmission connection with the annular groove 605 arranged in the middle part of the outer peripheral surface of the driven shaft 603 through the belt 604, as shown in figure 3, the belt 604 is not easy to shift when the outer peripheral surfaces of the driving shaft 602 and the driven shaft 603 rotate through the annular groove 605, the transmission reliability of the belt 604 is improved, the bush 7 is placed in the, as shown in fig. 3, to facilitate alignment of the gap of the bush 7 with greater precision.
Wherein, T type slider 403 sliding connection is inside T type spout 301, and T type slider 403 length accounts for the fifth of sliding bottom plate 4 length to it is more stable when sliding bottom plate 4 slides to the not opening position of slide rail 3, has further improved the stability of sliding bottom plate 4 when sliding.
Wherein, adjusting hand wheel 601 outer peripheral face is provided with anti-skidding stripe, as shown in fig. 4, and adjusting hand wheel 601 diameter is two times to three times of driving shaft 602 and driven shaft 603 diameter, through adjusting hand wheel 601, make the bush 7 of placing at belt 604 up end middle part if take place the gap unalignment phenomenon, accessible rotates adjusting hand wheel 601, drive belt 604 and carry out the transmission, thereby make the bush 7 of placing at belt 604 up end middle part follow and rotate, after the bush 7 gap aligns, stall adjusting hand wheel 601 can, the precision when bush 7 adjusts has been improved, thereby it is more convenient when making bush 7 adjust.
The specific use mode and function of the embodiment are as follows:
when the bushing 7 adjusting device is used, the four bushings 7 are placed on the upper end faces of the four belts 604 on the sliding bottom plate 4 on the rear side, when gaps are not aligned after the bushings 7 are placed, the driving shaft 602 starts to rotate by rotating the adjusting hand wheel 601, and the driven shaft 603 is driven by the belts 604 to synchronously rotate, so that the bushings 7 placed in the middle of the upper end faces of the belts 604 rotate along with the adjustment, and when the gaps of the bushings 7 are aligned, the adjusting hand wheel 601 stops rotating, so that the adjusting accuracy of the bushings 7 is improved, and the bushings 7 are adjusted more conveniently; then, by the operation of the four clamping cylinders 505, the four bushings 7 are clamped between the four clamping blocks 506 and the four L-shaped bases 501 respectively; after the four bushings 7 on the rear side are clamped, the handle 401 on the sliding bottom plate 4 on the rear side drives the sliding bottom plate 4 on the rear side to slide rightwards to the support table 2 of the welding device, and then the four bushings 7 on the upper portion of the sliding bottom plate 4 on the rear side are welded through the welding device; when the four bushings 7 on the upper part of the rear sliding bottom plate 4 are welded, the bushings 7 on the four clamping mechanisms 5 on the upper part of the front sliding bottom plate 4 can be placed and clamped in advance; after welding of the four bushings 7 on the upper portion of the rear sliding bottom plate 4 is completed, the handle 401 on the rear sliding bottom plate 4 drives the rear sliding bottom plate 4 to slide leftwards to the rear limiting block 302, then the handle 401 on the front sliding bottom plate 4 drives the front sliding bottom plate 4 to slide backwards to the welding device supporting table 2, and then welding of the four bushings 7 on the upper portion of the front sliding bottom plate 4 is performed, so that the welding efficiency of the bushings 7 is greatly improved.
The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (7)
1. The utility model provides a bush clamping mechanism for car seat bush automatic weld, includes L type workstation (1), its characterized in that: a welding device supporting table (2) is arranged on the rear side of the right end face of the L-shaped workbench (1), and a welding device is arranged on the upper portion of the welding device supporting table (2); the front side and the rear side of the upper end surface of the L-shaped workbench (1) are symmetrically provided with two sliding rails (3), and the upper parts of the two sliding rails (3) at the front side and the two sliding rails (3) at the rear side are both connected with one sliding bottom plate (4) in a sliding manner; the upper part of each sliding bottom plate (4) is provided with four clamping mechanisms (5), and the upper part of each clamping mechanism (5) is provided with one bushing (7); and one lining adjusting device (6) is rotatably connected inside each clamping mechanism (5).
2. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: the sliding rail (3) further comprises a T-shaped sliding groove (301) and a limiting block (302), the T-shaped sliding groove (301) is formed in the upper end face of the sliding rail (3), and the limiting block (302) is installed at the opening end of the T-shaped sliding groove (301) formed in the upper end face of the sliding rail (3).
3. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: the sliding bottom plate (4) further comprises a handle (401), supporting blocks (402) and T-shaped sliding blocks (403), the handle (401) is fixedly connected to the upper end face of the sliding bottom plate (4), the two T-shaped sliding blocks (403) are fixedly connected to the bottom end face of the sliding bottom plate (4) in a symmetrical mode, and the two supporting blocks (402) are fixedly connected to the upper end face of the sliding bottom plate (4) in a symmetrical mode.
4. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: the clamping mechanism (5) further comprises an L-shaped base (501), a placing groove (502), a rectangular through hole (503), a circular through hole (504), a clamping cylinder (505), a clamping block (506) and an alignment mark rod (507), wherein the L-shaped base (501) is fixedly connected to the upper end face of the supporting block (402), a placing groove (502) is arranged on the upper end surface of the middle part of the L-shaped base (501), a rectangular through hole (503) is arranged on the bottom end surface inside the placing groove (502), the rear side of the right end face of the L-shaped base (501) is provided with two circular through holes (504) which penetrate through the rectangular through hole (503), and the upper end surface of the middle part of the L-shaped base (501) is provided with a clamping cylinder (505), the clamping cylinder (505) is connected with a clamping block (506) through a sliding column in a sliding way, an alignment mark rod (507) is fixedly connected to the left side of the bottom end face in the placing groove (502).
5. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: the bushing adjusting device (6) also comprises an adjusting hand wheel (601), a driving shaft (602), a driven shaft (603), a belt (604) and an annular groove (605), the driving shaft (602) and the driven shaft (603) are rotatably connected inside the circular through hole (504) through rotating shafts, and the left end face of the left rotating shaft of the driving shaft (602) is fixedly connected with an adjusting hand wheel (601), the middle parts of the peripheral surfaces of the driving shaft (602) and the driven shaft (603) are respectively provided with an annular groove (605), an annular groove (605) arranged in the middle of the outer peripheral surface of the driving shaft (602) is in transmission connection with an annular groove (605) arranged in the middle of the outer peripheral surface of the driven shaft (603) through a belt (604), a bushing (7) is arranged in the middle of the upper end surface of the belt (604), and the length direction central line of the upper end surface of the belt (604) is aligned with the length direction central line of the upper end surface of the alignment mark rod (507).
6. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: t type slider (403) sliding connection is inside T type spout (301), and T type slider (403) length accounts for sliding bottom plate (4) one fifth of length.
7. The bushing clamping mechanism for automatic welding of a bushing for a seat of an automobile according to claim 1, wherein: the outer peripheral surface of the adjusting hand wheel (601) is provided with anti-skid stripes, and the diameter of the adjusting hand wheel (601) is two times to three times of the diameter of the driving shaft (602) and the driven shaft (603).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952378.4A CN110605518A (en) | 2019-10-09 | 2019-10-09 | Bushing clamping mechanism for automatic welding of automobile seat bushing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910952378.4A CN110605518A (en) | 2019-10-09 | 2019-10-09 | Bushing clamping mechanism for automatic welding of automobile seat bushing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110605518A true CN110605518A (en) | 2019-12-24 |
Family
ID=68894174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910952378.4A Withdrawn CN110605518A (en) | 2019-10-09 | 2019-10-09 | Bushing clamping mechanism for automatic welding of automobile seat bushing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110605518A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139730A (en) * | 2020-09-06 | 2020-12-29 | 安徽誉林汽车部件有限公司 | Bushing clamping mechanism for automatically welding automobile seat bushing and using method thereof |
| CN112676899A (en) * | 2021-01-04 | 2021-04-20 | 张利峰 | Machining loading attachment based on automated control |
| CN113732607A (en) * | 2021-09-28 | 2021-12-03 | 九江职院船舶与海洋工程技术有限公司 | Clamping device for welding, fixing and clamping thick plates of ships |
-
2019
- 2019-10-09 CN CN201910952378.4A patent/CN110605518A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112139730A (en) * | 2020-09-06 | 2020-12-29 | 安徽誉林汽车部件有限公司 | Bushing clamping mechanism for automatically welding automobile seat bushing and using method thereof |
| CN112676899A (en) * | 2021-01-04 | 2021-04-20 | 张利峰 | Machining loading attachment based on automated control |
| CN113732607A (en) * | 2021-09-28 | 2021-12-03 | 九江职院船舶与海洋工程技术有限公司 | Clamping device for welding, fixing and clamping thick plates of ships |
| CN113732607B (en) * | 2021-09-28 | 2023-10-10 | 九江职院船舶与海洋工程技术有限公司 | Ship thick plate welding, fixing and clamping device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20191224 |
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| WW01 | Invention patent application withdrawn after publication |