CN113103032B - Fixture for one-sequence mixed line machining of automobile hub - Google Patents
Fixture for one-sequence mixed line machining of automobile hub Download PDFInfo
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- CN113103032B CN113103032B CN202110412856.XA CN202110412856A CN113103032B CN 113103032 B CN113103032 B CN 113103032B CN 202110412856 A CN202110412856 A CN 202110412856A CN 113103032 B CN113103032 B CN 113103032B
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- fixedly connected
- centering
- panel
- gas detection
- rack
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/002—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring the holding action of work or tool holders
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Abstract
The invention discloses a clamp for processing an automobile hub one-sequence mixed line, which relates to the field of automobile clamps and comprises a chassis, wherein a panel is fixedly connected to the upper end of the chassis, a gas detection device is fixedly connected to the upper surface of the panel, a pressing strip is fixedly connected to the panel, a rack arrangement groove is formed in the panel, a self-centering mechanism is fixedly connected to the upper end of the panel, a rack is fixedly connected to the self-centering mechanism, a positioning seat is fixedly connected to the rack, a positioning block is fixedly connected to the positioning seat, a guide sleeve is fixedly connected to the middle of the chassis, a guide shaft is arranged in the guide sleeve, a sliding plate is fixedly connected to the upper end of the guide shaft, a pulling claw is rotatably connected to the sliding plate, a pulling claw groove is formed in the side surface of the panel, and the pulling claw is arranged in the pulling claw groove.
Description
Technical Field
The invention relates to the field of automobile clamps, in particular to a clamp for machining an automobile hub one-sequence mixed line.
Background
The machining process of the wheel usually needs three-sequence machining, but due to the difference of the outer diameter parameters of the wheels with different sizes, the limited stroke range of the chuck plate leads to the difficulty in machining the hubs with different sizes by using one set of clamp, and in the actual machining process, when the wheels with different sizes and specifications need to be replaced, one set of part or even a whole set of clamp needs to be replaced, so that the auxiliary time of workshop production is increased, the production efficiency is reduced, and the labor intensity of workers is increased.
Mixed flow production is a production mode for producing various products on one production line in a certain period of time. A plurality of product varieties with basically the same process flow and production operation method are scientifically arranged in production sequence on a production line, rhythmic and proportional mixed continuous production line production is realized, and comprehensive balance of varieties, yield, working hours and equipment load is taken as the premise.
In the actual machining and line mixing production of wheels, because wheels with different sizes need corresponding clamps, automatic line mixing machining of the wheels cannot be realized, and therefore it is necessary to design a clamp which can be used in the first machining of the wheels with different sizes so as to realize automatic line mixing machining of the wheels with different sizes.
Disclosure of Invention
For solving above-mentioned technical problem, provide an automobile wheel hub preface anchor clamps for processing of mixing line, this technical scheme can carry out the centre gripping to the lane of two kinds of not unidimensional when carrying out wheel preface processing, can realize two kinds of product processing demands of automated production mixed line.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a clamp for one-sequence mixed line processing of automobile hubs comprises a chassis, wherein a panel is fixedly connected to the upper end of the chassis, a gas detection device is fixedly connected to the edge position of the upper surface of the panel, a pressing strip is fixedly connected to the panel, a rack arrangement groove is formed in the panel, a self-centering mechanism is fixedly connected to the upper end of the panel, a rack is fixedly connected to the self-centering mechanism, a positioning seat is fixedly connected to the rack, a positioning block is fixedly connected to the positioning seat, a guide sleeve is fixedly connected to the middle of the chassis, a guide shaft is arranged in the guide sleeve, a sliding plate is fixedly connected to the upper end of the guide shaft, the upper end of the sliding plate is abutted to the lower surface of the panel, a pulling claw is rotatably connected to the sliding plate, a pulling claw groove is formed in the side surface of the panel, and the pulling claw is arranged in the pulling claw groove;
the self-centering mechanism comprises a mounting plate, a centering sleeve is connected inside the mounting plate in a sliding manner, a centering slide block is connected on the centering sleeve in a sliding manner, a lower plate is fixedly connected to the bottom of the mounting plate, an upper plate is fixedly connected to the upper end of the mounting plate, a rack mounting groove is formed in the centering slide block, and the rack is fixedly connected in the rack mounting groove;
the pull claw comprises a pull arm and a mixed wire pull claw head, the mixed wire pull claw head is fixedly connected to one end of the pull arm, and the mixed wire pull claw head is of a U-shaped structure;
the thickness of the centering sleeve is smaller than that of the mounting plate, the depth of a groove for arranging the centering slide block on the mounting plate is the same as that of the centering slide block, an angle A is formed between a contact surface of the centering sleeve and the centering slide block and a vertical surface, and the angle A is more than 15 degrees and less than or equal to 75 degrees;
the guide shaft is of a hollow structure, a guide shaft cover is fixedly connected to the upper end of the guide shaft, the sliding plate is fixedly connected with the guide shaft through a guide bearing, a connecting column is arranged at the upper end of the guide shaft, and the upper end of the connecting column is fixedly connected with the centering sleeve.
Preferably, the lower end of the chassis is fixedly connected with an end cover, the end cover is connected with a spring, the upper end of the spring is abutted to the lower surface of the panel, the chassis is connected with a joint shaft, the lower end of the sliding plate is fixedly connected with a bearing cover, the upper end of the bearing cover is fixedly connected with a bearing, the joint shaft is arranged in the bearing, and the upper end of the joint shaft is abutted to the lower surface of the panel.
Preferably, the gas detection device includes that gas detects mount pad, gas and examines post and gas detection pressure head, gas detection post sliding connection is inside gas detection mount pad, gas detection pressure head fixed connection is on gas detection post surface, the pressure head groove is seted up on gas detection mount pad surface, gas detection pressure head sets up at the pressure head inslot.
Preferably, centering slider has threely, and is three even sliding connection in centering cover of design slider, the rack has threely, and is three the rack respectively with three centering slider fixed connection, the layering has six, wherein two the layering is a set of, and is a set of clearance between the layering is provided with the rack and sets up the groove, the rack sets up in the rack sets up the groove, three group the layering evenly sets up on the panel surface, it has threely, three to draw the claw draw the even setting of claw on the slide.
Preferably, the layering superscript has the scale mark, can carry out accurate installation according to the scale mark on the layering when the positioning seat is installed on the rack.
When the automobile hub is actually clamped, the external driving mechanism is connected with the connecting column through the hollow guide shaft, the driving mechanism drives the connecting column to move up and down, the connecting column is fixedly connected with the centering sleeve, therefore, the centering sleeve can move up and down along with the connecting column, in the process of moving up and down of the centering sleeve, as the contact surface of the centering slider and the centering sleeve is an inclined surface, and the centering slider is restrained in the vertical direction, the centering slider can horizontally move when the centering sleeve moves up and down, so that the rack, the positioning seat and the positioning block which are fixedly connected to the rack are driven to move in the horizontal direction, radial restraint is exerted on a wheel to achieve a centering effect, when the hub is placed on the clamp, the hub can be pressed down by the air detection pressure head on the air detection device to enter the pressure head groove, the air detection pressure head drives the air detection column to move downwards to block an air hole below the air detection column, the pressure inside the clamp reaches a pre-designed air pressure value, the hub is indicated to be correctly placed, the pulling claw rotates to press the hub to exert axial restraint, the pulling claw head is set to be in a U-shaped structure, and the self-centering of the hub can be quickly centered according to the size of the clamp, and the clamp, the clamp can be quickly, and the clamp can be used for realizing the self-centering efficiency of the self-centering sleeve.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic perspective view of another embodiment of the present invention;
FIG. 3 is an exploded view of the present invention;
FIG. 4 is a top view of the present invention;
FIG. 5 isbase:Sub>A cross-sectional view of section A-A of FIG. 4;
FIG. 6 is a cross-sectional view of the self-positioning mechanism of the present invention;
FIG. 7 is an exploded view of the self-positioning mechanism of the present invention;
FIG. 8 is a perspective view showing the connection between the positioning sleeve and the positioning block;
FIG. 9 is a top view of the connection between the positioning sleeve and the positioning block of the present invention;
FIG. 10 is a sectional view showing the connection between the positioning sleeve and the positioning block according to the present invention;
FIG. 11 is a perspective view of the pulling pawl of the present invention;
fig. 12 is a perspective view of a gas detection device according to the present invention.
The reference numbers in the figures are:
1. a chassis; 2. a slide plate; 3. a panel; 4. a self-centering mechanism; 401. mounting a plate; 402. a centering sleeve; 403. an upper plate; 404. a lower plate; 405. a centering slide block; 406. a rack mounting groove; 5. a joint shaft; 6. a spring; 7. a guide sleeve; 8. a guide shaft; 9. an end cap; 10. a guide bearing; 11. connecting columns; 12. pulling a claw; 1201. pulling the arm; 1202. a claw head; 13. layering; 14. a gas detection device; 1401. a gas detection mounting seat; 1402. a gas detection pressure head; 1403. gas detection columns; 15. a rack setting groove; 16. positioning a block; 17. positioning seats; 18. a rack; 19. a bearing cap; 20. and (5) a bearing.
Detailed Description
The following description is provided to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art.
Referring to fig. 1-5, an automobile hub one-order mixed line machining fixture comprises a chassis 1, a panel 3 is fixedly connected to the upper end of the chassis 1, an air detection device 14 is fixedly connected to the edge position of the upper surface of the panel 3, a pressing bar 13 is fixedly connected to the panel 3, scale lines are marked on the pressing bar 13, when the positioning seat 17 is installed on a rack 18, accurate installation can be performed according to the scale lines on the pressing bar 13, a rack setting groove 15 is formed in the panel 3, a self-centering mechanism 4 is fixedly connected to the upper end of the panel 3, a rack 18 is fixedly connected to the self-centering mechanism 4, a positioning seat 17 is fixedly connected to the rack 18, a positioning block 16 is fixedly connected to the positioning seat 17, a guide sleeve 7 is fixedly connected to the middle of the chassis 1, a guide shaft 8 is arranged in the guide sleeve 7, a sliding plate 2 is fixedly connected to the upper end of the guide shaft 8, the upper end of the sliding plate 2 is abutted to the lower surface of the sliding plate 2, a pull claw 12 is rotatably connected to the sliding plate 2, a pull claw groove is formed in the side surface of the panel 3, the pull claw 12 is arranged in the pull claw groove, an end cover 9 is fixedly connected to the lower end of the chassis 1, a spring 6 is fixedly connected to the lower end of the sliding plate 9, a joint shaft is abutted to the panel 3, a bearing 5 is fixedly connected to the bearing 5, a bearing 5 is connected to the bearing 5, and a bearing cover 20 is connected to the lower end of the bearing 5 is connected to the bearing 5 in the bearing 5 and connected to the bearing 5 in the bearing 5;
the guide shaft 8 is of a hollow structure, the upper end of the guide shaft 8 is fixedly connected with a guide bearing 10, the sliding plate 2 is fixedly connected with the guide shaft 8 through the guide bearing 10, the upper end of the guide shaft 8 is provided with a connecting column 11, the upper end of the connecting column 11 is fixedly connected with the centering sleeve 402, an external driving mechanism is connected with the connecting column 11 through the hollow guide shaft 8, the driving mechanism drives the connecting column 11 to move up and down, and the connecting column 11 is fixedly connected with the centering sleeve 402, so that the centering sleeve 402 can move up and down along with the connecting column 11 to achieve a self-centering effect;
the centering slide blocks 405 are three, the three centering slide blocks 405 are evenly connected to the centering sleeve 402 in a sliding mode, the number of the racks 18 is three, the three racks 18 are fixedly connected with the three centering slide blocks 405 respectively, the number of the pressing strips 13 is six, two of the pressing strips 13 are a group, a rack setting groove 15 is formed in a gap between the group of the pressing strips 13, the racks 18 are arranged in the rack setting groove 15, the three groups of the pressing strips 13 are evenly arranged on the surface of the panel 3, the number of the pull claws 12 is three, the three pull claws 12 are evenly arranged on the sliding plate 2, and the pull claws 12 and the positioning blocks 16 are alternately arranged.
As shown in fig. 6-10, the self-centering mechanism 4 includes a mounting plate 401, a centering sleeve 402 is slidably connected inside the mounting plate 401, a centering slider 405 is slidably connected on the centering sleeve 402, a lower plate 404 is fixedly connected to the bottom of the mounting plate 401, an upper plate 403 is fixedly connected to the upper end of the mounting plate 401, a rack mounting groove 406 is formed in the centering slider 405, a rack 18 is fixedly connected in the rack mounting groove 406, the thickness of the centering sleeve 402 is smaller than that of the mounting plate 401, the groove depth of the centering slider 405 arranged on the mounting plate 401 is the same as that of the centering slider 405, and a contact surface between the centering sleeve 402 and the centering slider 405 is 20 degrees from vertical;
carry out the clamping jaw from the centering through centering sleeve 402 and the centering slider 405 that has the inclined plane, its simple structure can design the inclined plane of different angles according to the size difference of mixed line processing at centering in-process, compares with traditional conical gear centering mechanism, uses inclined plane centering sleeve 402 and centering slider 405 to carry out the process of anchor clamps centering faster, has greatly improved the efficiency of wheel hub processing, and simple structure, convenient manufacturing.
Referring to fig. 11, the pull claw 12 includes a pull arm 1201 and a mixed wire pull claw head 1202, the mixed wire pull claw head 1202 is fixedly connected to one end of the pull arm 1201, the mixed wire pull claw head 1202 is U-shaped, two press heads can respectively correspond to hubs with different sizes, and a distance between the two press heads of the pull claw head 1202 can be freely selected according to the size of a wheel in the mixed wire production line, so that the clamp can clamp hubs with different sizes.
Referring to fig. 12, the gas detection device 14 includes a gas detection mounting seat 1401, a gas detection column 1403 and a gas detection pressure head 1402, the gas detection column 1403 is slidably connected inside the gas detection mounting seat 1401, the gas detection pressure head 1402 is fixedly connected to the surface of the gas detection column 1403, a pressure head groove is formed in the surface of the gas detection mounting seat 1401, the gas detection pressure head 1402 is disposed in the pressure head groove, when the hub is placed on the fixture, the hub presses down the gas detection pressure head 1402 on the gas detection device 14 to enable the gas detection pressure head to enter the pressure head groove, and the gas detection pressure head 1402 drives the gas detection column 1403 to move down to block an air hole below the gas detection column 1403, so that the pressure inside the fixture reaches a pre-designed air pressure value, which indicates that the hub is correctly placed.
In conclusion, the clamp has the advantages that the centering mechanism with the centering sleeve matched with the centering slide block is adopted, the structure is simple, the machining is convenient, the centering process is quicker, the machining efficiency of the wheel hub is improved, and the two pressing heads can respectively correspond to the wheel hubs with different sizes by adopting the pull claw head with the U-shaped structure, so that the clamp can clamp the wheel hubs with different sizes, and the automation degree of the wheel machining in a mixed line mode is greatly improved.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The fixture for the one-sequence mixed line machining of the automobile hub is characterized by comprising a chassis (1), wherein a panel (3) is fixedly connected to the upper end of the chassis (1), a gas detection device (14) is fixedly connected to the edge position of the upper surface of the panel (3), a pressing strip (13) is fixedly connected to the panel (3), a rack setting groove (15) is formed in the panel (3), a self-centering mechanism (4) is fixedly connected to the upper end of the panel (3), a rack (18) is fixedly connected to the self-centering mechanism (4), a positioning seat (17) is fixedly connected to the rack (18), a positioning block (16) is fixedly connected to the positioning seat (17), a guide sleeve (7) is fixedly connected to the middle of the chassis (1), a guide shaft (8) is arranged in the guide sleeve (7), a sliding plate (2) is fixedly connected to the upper end of the guide shaft (8), the upper surface of the sliding plate (2) is abutted to the lower surface of the panel (3), a pulling claw (12) is rotatably connected to the side surface of the panel (3), and the pulling claw (12) is arranged in the pulling claw groove;
the self-centering mechanism (4) comprises a mounting plate (401), a centering sleeve (402) is slidably connected inside the mounting plate (401), a centering sliding block (405) is slidably connected onto the centering sleeve (402), a lower plate (404) is fixedly connected to the bottom of the mounting plate (401), an upper plate (403) is fixedly connected to the upper end of the mounting plate (401), a rack mounting groove (406) is formed in the centering sliding block (405), and the rack (18) is fixedly connected into the rack mounting groove (406);
the wire drawing claw (12) comprises a drawing arm (1201) and a wire mixing drawing claw head (1202), the wire mixing drawing claw head (1202) is fixedly connected to one end of the drawing arm (1201), and the wire mixing drawing claw head (1202) is of a U-shaped structure;
the thickness of the centering sleeve (402) is smaller than that of the mounting plate (401), the depth of a sliding groove formed in the mounting plate (401) and provided with the centering sliding block (405) is the same as that of the centering sliding block (405), an angle A is formed between a contact surface of the centering sleeve (402) and the centering sliding block (405) and a vertical surface, and the angle A is more than 15 degrees and less than or equal to 75 degrees;
guide shaft (8) are hollow structure, fixedly connected with guiding bearing (10) in guide shaft (8) upper end, slide (2) are through guiding bearing (10) and guiding shaft (8) fixed connection, guide shaft (8) upper end is provided with spliced pole (11), spliced pole (11) upper end and centering sleeve (402) fixed connection.
2. The automobile hub one-sequence mixed line machining clamp according to claim 1, characterized in that an end cover (9) is fixedly connected to the lower end of the chassis (1), a spring (6) is connected to the end cover (9), the upper end of the spring (6) abuts against the lower surface of the panel (3), a joint shaft (5) is connected to the chassis (1), a bearing cover (19) is fixedly connected to the lower end of the sliding plate (2), a bearing (20) is fixedly connected to the upper end of the bearing cover (19), the joint shaft (5) is arranged in the bearing (20), and the upper end of the joint shaft (5) abuts against the lower surface of the panel (3).
3. The clamp for processing the mixed line of the automobile hub in the one-step sequence according to claim 2, wherein the gas detection device (14) comprises a gas detection mounting seat (1401), a gas detection column (1403) and a gas detection pressure head (1402), the gas detection column (1403) is connected inside the gas detection mounting seat (1401) in a sliding mode, the gas detection pressure head (1402) is fixedly connected to the surface of the gas detection column (1403), a pressure head groove is formed in the surface of the gas detection mounting seat (1401), and the gas detection pressure head (1402) is arranged in the pressure head groove.
4. The automobile wheel hub order clamp for mixed line machining of claim 3, characterized in that there are three centering sliders (405), three centering sliders (405) are evenly slidably connected to a centering sleeve (402), there are three racks (18), three racks (18) are respectively fixedly connected to the three centering sliders (405), six pressing strips (13) are provided, two of the pressing strips (13) are in a group, a group of the pressing strips (13) are provided with rack setting grooves (15) in a gap, the racks (18) are arranged in the rack setting grooves (15), three groups of the pressing strips (13) are evenly arranged on the surface of a panel (3), and three pulling claws (12) are provided with three pulling claws (12) which are evenly arranged on a sliding plate (2).
5. The clamp for machining the one-sequence mixed line of the automobile hub according to claim 4, wherein scale marks are marked on the pressing strip (13), and the positioning seat (17) can be accurately installed according to the scale marks on the pressing strip (13) when being installed on the rack (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110412856.XA CN113103032B (en) | 2021-04-16 | 2021-04-16 | Fixture for one-sequence mixed line machining of automobile hub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110412856.XA CN113103032B (en) | 2021-04-16 | 2021-04-16 | Fixture for one-sequence mixed line machining of automobile hub |
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| Publication Number | Publication Date |
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| CN113103032A CN113103032A (en) | 2021-07-13 |
| CN113103032B true CN113103032B (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110412856.XA Active CN113103032B (en) | 2021-04-16 | 2021-04-16 | Fixture for one-sequence mixed line machining of automobile hub |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115026717B (en) * | 2022-06-07 | 2024-02-06 | 浙江步阳汽轮有限公司 | New energy automobile hub machining device and machining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09277078A (en) * | 1996-04-18 | 1997-10-28 | Amada Co Ltd | Laser beam machine |
| DE102005020703A1 (en) * | 2004-06-05 | 2005-12-29 | Hohenstein Vorrichtungsbau Und Spannsysteme Gmbh | Intelligent tool clamping device for dry machining has clamping wall forming clamping angle with three-dimensional segment |
| CN103781591A (en) * | 2011-09-02 | 2014-05-07 | Smc株式会社 | Clamping device |
| CN204603906U (en) * | 2015-04-22 | 2015-09-02 | 济南新立新机器制造有限公司 | A kind of vapour-pressure type clamping detection mechanism and Hub fixture |
| CN204621577U (en) * | 2015-03-23 | 2015-09-09 | 芜湖黄燕实业有限公司 | Inner rim positioning tool |
-
2021
- 2021-04-16 CN CN202110412856.XA patent/CN113103032B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09277078A (en) * | 1996-04-18 | 1997-10-28 | Amada Co Ltd | Laser beam machine |
| DE102005020703A1 (en) * | 2004-06-05 | 2005-12-29 | Hohenstein Vorrichtungsbau Und Spannsysteme Gmbh | Intelligent tool clamping device for dry machining has clamping wall forming clamping angle with three-dimensional segment |
| CN103781591A (en) * | 2011-09-02 | 2014-05-07 | Smc株式会社 | Clamping device |
| CN204621577U (en) * | 2015-03-23 | 2015-09-09 | 芜湖黄燕实业有限公司 | Inner rim positioning tool |
| CN204603906U (en) * | 2015-04-22 | 2015-09-02 | 济南新立新机器制造有限公司 | A kind of vapour-pressure type clamping detection mechanism and Hub fixture |
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| CN113103032A (en) | 2021-07-13 |
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