CN111686490A - Self-cleaning formula grinds trigger copper powder recovery unit - Google Patents
Self-cleaning formula grinds trigger copper powder recovery unit Download PDFInfo
- Publication number
- CN111686490A CN111686490A CN202010578420.3A CN202010578420A CN111686490A CN 111686490 A CN111686490 A CN 111686490A CN 202010578420 A CN202010578420 A CN 202010578420A CN 111686490 A CN111686490 A CN 111686490A
- Authority
- CN
- China
- Prior art keywords
- copper powder
- wall
- frame
- base
- circular recess
- Prior art date
- 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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Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 15
- 238000004140 cleaning Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000000227 grinding Methods 0.000 claims abstract description 7
- 235000000396 iron Nutrition 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 11
- 230000005484 gravity Effects 0.000 abstract description 7
- 238000001914 filtration Methods 0.000 abstract description 5
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 238000009825 accumulation Methods 0.000 abstract 1
- 238000007790 scraping Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005201 scrubbing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
- B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
- B01D29/6484—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a translatory movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/70—Regenerating the filter material in the filter by forces created by movement of the filter element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a copper powder recovery device for a self-cleaning type plate grinding machine, which comprises a base, wherein a circular groove is formed in the side wall of the base, a rotating shaft is rotatably connected to the inner wall of the circular groove, a plurality of iron frames are welded to the side wall of the rotating shaft, the outer wall of each frame is tightly attached to the inner wall of the circular groove, a filter screen is embedded in each frame, a plurality of permanent magnets corresponding to the frames are embedded in the inner wall of the circular groove, an arc-shaped plate is fixedly connected to the side wall of each frame, a water storage groove is formed in the side wall of the base, and a water outlet is communicated between the water storage groove and the circular groove. According to the invention, after the rotating shaft is pushed by the gravity of the copper powder to rotate clockwise for a certain angle, the copper powder falls out of the discharge hole, so that the phenomenon that the filtering performance of the copper powder is influenced due to accumulation of the copper powder on the filter screen can be avoided, and the recovery efficiency of the copper powder is greatly improved.
Description
Technical Field
The invention relates to the technical field of relevant equipment of circuit board grinding machines, in particular to a copper powder recovery device for a self-cleaning type board grinding machine.
Background
Can produce a large amount of copper powders at the circuit board scrubbing in-process, consequently often need be equipped with the shower and erode the built-in work subassembly of board grinding machine when scrubbing, the high temperature that produces when can reducing on the one hand to polish, on the other hand still can wash away the copper powder through high-pressure rivers.
In order to avoid waste caused by copper powder loss, in the prior art, copper powder is recycled by erecting a pipeline to guide the water flow containing the copper powder into a copper powder recycling machine, and the copper powder is mainly filtered out by a filter bag or a filter screen and other filter equipment. However, the copper powder is soaked in water for a long time and is very wet, so that the copper powder has high viscosity, the filtered copper powder is easy to be adhered to the filter bag in a large scale to cause the reduction of the filtering performance, the recovery efficiency of the copper powder is further influenced, and meanwhile, the filter bag or the filter screen is usually arranged inside the recovery machine and is difficult to clean. Accordingly, the application file provides a self-cleaning formula grinds trigger and uses copper powder recovery unit.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a copper powder recovery device for a self-cleaning type plate grinding machine.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a self-cleaning formula copper powder recovery unit for grinder, includes the base, the circular recess has been seted up to the lateral wall of base, it is connected with the pivot to rotate on the inner wall of circular recess, the welding has the frame of a plurality of irons system on the lateral wall of pivot, just the outer wall of frame closely laminates with the inner wall of circular recess, the embedded filter screen that is equipped with of frame, it is equipped with a plurality of permanent magnets that correspond with the frame to inlay on the circular recess inner wall, fixedly connected with arc on the lateral wall of frame, the aqua storage tank has been seted up to the lateral wall of base, just the intercommunication has the delivery port between aqua storage tank and the circular recess, outlet pipe, the inlet tube of fixedly connected with and circular recess, aqua storage tank intercommunication respectively on two relative lateral walls of base, the same discharge gate with the.
Preferably, the inner wall of the frame is provided with a sliding groove, a scraping plate is connected in the sliding groove in a sliding mode, and the scraping plate is elastically connected to the side wall of the rotating shaft through a spring.
Preferably, the inner top of the chute is fixedly connected with a telescopic airbag, a one-way air inlet pipe communicated with the telescopic airbag is embedded in the frame, a one-way air outlet channel communicated with the telescopic airbag is formed in the side wall of the scraping plate, and a plurality of air outlet holes communicated with the one-way air outlet channel are formed in the upper end of the scraping plate.
The invention has the following beneficial effects:
1. by arranging the iron frame, the permanent magnet and other components, when the copper powder filtered out of the filter screen reaches a certain mass, the gravity of the copper powder on the filter screen is greater than the magnetic force, the rotating shaft can be pushed to rotate clockwise by a certain angle, and the copper powder falls out of the discharge port under the action of the gravity, so that the copper powder is prevented from being accumulated on the filter screen to influence the filtering performance of the filter screen, and the recovery efficiency of the copper powder is greatly improved;
2. by arranging the scraper, the spring, the permanent magnet and other components, when the rotating shaft does not rotate, the scraper is attracted by the permanent magnet and is attached to the permanent magnet, when the rotating shaft rotates for a certain angle, the distance between the scraper and the permanent magnet is far and the magnetic force is small, and the spring can pull the scraper to move in the reverse direction of the rotating shaft, so that residual copper powder on the filter screen can be scraped, the adhesion amount of the copper powder on the filter screen is further reduced, and the filtering performance of the filter screen is improved again;
3. through setting up parts such as flexible gasbag, one-way intake pipe and one-way air outlet channel, can remove the in-process at the scraper blade, exhaust to the venthole to partly remain the copper powder on the filter screen and blow off, in order to keep the good filter effect of filter screen.
Drawings
Fig. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view of the structure at B in FIG. 1;
FIG. 4 is a schematic structural diagram of the rotating shaft rotating at a certain angle;
fig. 5 is a schematic structural diagram of components such as a frame in the second embodiment.
In the figure: the water storage device comprises a base 1, a circular groove 2, a rotating shaft 3, a frame 4, a sliding groove 41, a one-way air inlet pipe 42, a filter screen 5, a scraper 6, a spring 7, an inlet pipe 8, an outlet pipe 9, a discharge hole 10, a permanent magnet 11, an arc-shaped plate 12, a telescopic air bag 13, a one-way air outlet channel 14, an air outlet hole 141, a water storage groove 15 and a water outlet 151.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
referring to fig. 1-4, a copper powder recovery device for a self-cleaning type plate grinding machine comprises a base 1, wherein a circular groove 2 is formed in the side wall of the base 1, a rotating shaft 3 is rotatably connected to the inner wall of the circular groove 2, and a plurality of iron frames 4 are welded to the side wall of the rotating shaft 3. The surfaces of other iron parts such as the frame 4 and the like are coated with antirust coatings.
And the outer wall of the frame 4 is tightly attached to the inner wall of the circular groove 2, the filter screen 5 is embedded in the frame 4, and the inner wall of the circular groove 2 is embedded with a plurality of permanent magnets 11 corresponding to the frame 4. The plurality of frames 4 are disposed at equal intervals along the axis of the rotating shaft 3.
Fixedly connected with arc 12 on the lateral wall of frame 4, reservoir 15 has been seted up to the lateral wall of base 1, and the intercommunication has delivery port 151 between reservoir 15 and the circular recess 2, outlet pipe 9, the inlet tube 8 of fixedly connected with and circular recess 2, reservoir 15 intercommunication respectively on two relative lateral walls of base 1, the same discharge gate 10 of circular recess 2 is seted up to the lower extreme of base 1.
The inner wall of the frame is provided with a sliding chute 41, the sliding chute 41 is internally and slidably connected with a scraper 6, and the scraper 6 is elastically connected on the side wall of the rotating shaft 3 through a spring 7. The scraper 6 and the spring 7 are made of non-magnetic conductive materials so as to prevent the permanent magnet 11 from acting on the scraper 6 and the spring 7 to influence the use effect thereof.
When the device is used, the iron frames 4 are attracted by the corresponding permanent magnets 11 and are adhered together, so that the stability of each part can be kept. The water containing copper powder flows into the water storage tank 15 through the water inlet pipe 8, flows into the circular groove 2 through the water outlet 151, is discharged through the water outlet pipe 9 after being filtered by the lower filter screen 5, the water outlet 151 is not blocked by the upper arc-shaped plate 12 at the moment, and the discharge hole 10 is blocked by the lower arc-shaped plate 12 to prevent the water from being discharged from the discharge hole 10.
The filtered copper powder remains above the filter screen 5 (as shown in fig. 1), when the copper powder on the filter screen 5 is accumulated to a certain degree, that is, the gravity of the copper powder is greater than the magnetic force, the rotating shaft 3 can be pushed to rotate by a certain angle, the arc-shaped plate 12 above the rotating shaft blocks the water outlet 151 to stop discharging the copper powder-containing water into the circular groove 2, and the copper powder-containing water discharged from the water inlet pipe 8 is temporarily stored in the water storage tank 15. While the lower arcuate plate 12 is moved away from the discharge outlet 10 (as shown in fig. 4), the accumulated copper powder on the screen 5 slides under the force of gravity and is discharged from the discharge outlet 10. After the copper powder on the filter screen 5 falls off, the iron frame 4 rotates clockwise again under the attraction of the permanent magnet 11 and is attached together, so that the device can be continuously recycled. Copper powder adhered to the filter screen 5 can be greatly reduced, so that the filter screen 5 can always keep good filtering performance.
In addition, in the state of fig. 1, the inclination angle of the scraper 6 in the lower frame 4 is small, the component of the gravity force in the direction of the spring 7 is smaller than the elastic force of the spring 7, and the scraper 6 is pulled to a position close to the rotating shaft 3 by the spring 7 (as shown in fig. 1), and after the rotating shaft 3 rotates for a certain angle, the inclination angle of the scraper 6 in the lower frame 4 is large, the component of the gravity force in the direction of the spring 7 is larger than the elastic force of the spring 7, and the scraper 6 will slide for a certain distance away from the rotating shaft 3 (as shown in fig. 4), and when the rotating shaft 3 continues to rotate clockwise, the scraper 6 moves and resets towards the rotating shaft. So can rotate at pivot 3 and fall when powder, scraper blade 6 scrapes off the remaining copper powder on filter screen 5 surface, the copper powder volume of adhesion on greatly reduced filter screen 5 and improve filter screen 5's permeability.
Example two:
referring to fig. 5, different from the first embodiment, a telescopic airbag 13 is fixedly connected to an inner top of the chute 41, a unidirectional air inlet pipe 42 communicated with the telescopic airbag 13 is embedded in the frame 4, a unidirectional air outlet channel 14 communicated with the telescopic airbag 13 is formed on a side wall of the scraper 6, and a plurality of air outlet holes 141 communicated with the unidirectional air outlet channel 14 are formed at an upper end of the scraper 6.
It should be noted that, as shown in fig. 5, the end of the one-way air inlet pipe 42 away from the telescopic airbag 13 is embedded in the rotating shaft 3, so that air can be supplied to the telescopic airbag 13 and water in the circular groove 2 can be prevented from flowing into the telescopic airbag 13 during the rotation of the rotating shaft 3.
Further, the one-way air inlet pipe 42 only allows air to flow from the one-way air inlet pipe 42 to the inside of the telescopic airbag 13, and the one-way air outlet channel 14 only allows air to flow from the telescopic airbag 13 to the one-way air outlet channel 14. Specifically, during manufacturing, the one-way air inlet or outlet function can be realized by installing the one-way valve in the air inlet pipe or the air outlet channel.
Under the current-limiting effect of one-way intake pipe 42 and one-way air outlet channel 14, when scraper 6 removed towards pivot 3, can make flexible gasbag 13 extension and with the air by one-way intake pipe 42 suction flexible gasbag 13 in, and when scraper 6 kept away from pivot 3 and removed, flexible gasbag 13 contracts and discharges by venthole 141 with air in the flexible gasbag 13, scrape off the remaining copper powder on filter screen 5 at scraper 6 like this, still can blow to filter screen 5, make the remaining copper powder on filter screen 5 more drop easily, improve filter screen 5's permeability once more.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. The utility model provides a self-cleaning formula copper powder recovery unit for mill, includes base (1), its characterized in that, circular recess (2) have been seted up to the lateral wall of base (1), it is connected with pivot (3) to rotate on the inner wall of circular recess (2), the welding has frame (4) of a plurality of irons on the lateral wall of pivot (3), just the outer wall of frame (4) closely laminates with the inner wall of circular recess (2), frame (4) embedded filter screen (5) that are equipped with, inlay on circular recess (2) inner wall and be equipped with a plurality of permanent magnet (11) that correspond with frame (4), fixedly connected with arc (12) on the lateral wall of frame (4), aqua storage tank (15) have been seted up to the lateral wall of base (1), just it has delivery port (151) to communicate between aqua storage tank (15) and circular recess (2), respectively fixedly connected with circular recess (2) on two relative lateral walls of base (1), A water outlet pipe (9) and a water inlet pipe (8) communicated with the water storage tank (15), and a discharge hole (10) which is the same as the circular groove (2) is arranged at the lower end of the base (1).
2. The copper powder recovery device for the self-cleaning type plate grinding machine according to claim 1, wherein a sliding groove (41) is formed in the inner wall of the frame, a scraper (6) is connected in the sliding groove (41) in a sliding mode, and the scraper (6) is elastically connected to the side wall of the rotating shaft (3) through a spring (7).
3. The self-cleaning formula grinds board machine copper powder recovery unit of claim 1 or 2, characterized in that, the interior top fixedly connected with flexible gasbag (13) of spout (41), and frame (4) embedded be equipped with flexible gasbag (13) communicating one-way intake pipe (42), seted up on the lateral wall of scraper blade (6) with flexible gasbag (13) communicating one-way air outlet channel (14), and the upper end of scraper blade (6) is seted up a plurality of ventholes (141) with one-way air outlet channel (14) intercommunication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010578420.3A CN111686490A (en) | 2020-06-23 | 2020-06-23 | Self-cleaning formula grinds trigger copper powder recovery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010578420.3A CN111686490A (en) | 2020-06-23 | 2020-06-23 | Self-cleaning formula grinds trigger copper powder recovery unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111686490A true CN111686490A (en) | 2020-09-22 |
Family
ID=72483173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010578420.3A Withdrawn CN111686490A (en) | 2020-06-23 | 2020-06-23 | Self-cleaning formula grinds trigger copper powder recovery unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111686490A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112619305A (en) * | 2020-12-18 | 2021-04-09 | 李启超 | Dust filtering system for ventilation of underground engineering |
| CN113370419A (en) * | 2021-08-02 | 2021-09-10 | 浙江优为新材料有限公司 | Hyperbranched resin modified odor-free photocuring pipeline repairing material processing device |
| CN114308882A (en) * | 2022-01-21 | 2022-04-12 | 德清县诚达金属材料有限公司 | Carpet washing is cleaning device of clearance end of a thread for groove |
| CN115193320A (en) * | 2022-07-12 | 2022-10-18 | 青岛花帝食品配料有限公司 | Preparation device of functional seasoning for preventing and treating dyspepsia |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586526B2 (en) * | 1975-06-23 | 1983-02-04 | スミトモセキタンコウギヨウ カブシキガイシヤ | Koekibunriki |
| US20160228801A1 (en) * | 2014-06-30 | 2016-08-11 | Fuji Filter Manufacturing Co., Ltd. | Filtration device and filter element |
| CN206604245U (en) * | 2017-03-31 | 2017-11-03 | 赵亚宁 | Self-cleaning y-type filter |
| CN110152367A (en) * | 2019-06-28 | 2019-08-23 | 苏州艾捷尔斯生物科技有限公司 | Energy conservation and environmental protection sewage filter device in a kind of electricity generation system |
-
2020
- 2020-06-23 CN CN202010578420.3A patent/CN111686490A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS586526B2 (en) * | 1975-06-23 | 1983-02-04 | スミトモセキタンコウギヨウ カブシキガイシヤ | Koekibunriki |
| US20160228801A1 (en) * | 2014-06-30 | 2016-08-11 | Fuji Filter Manufacturing Co., Ltd. | Filtration device and filter element |
| CN206604245U (en) * | 2017-03-31 | 2017-11-03 | 赵亚宁 | Self-cleaning y-type filter |
| CN110152367A (en) * | 2019-06-28 | 2019-08-23 | 苏州艾捷尔斯生物科技有限公司 | Energy conservation and environmental protection sewage filter device in a kind of electricity generation system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112619305A (en) * | 2020-12-18 | 2021-04-09 | 李启超 | Dust filtering system for ventilation of underground engineering |
| CN113370419A (en) * | 2021-08-02 | 2021-09-10 | 浙江优为新材料有限公司 | Hyperbranched resin modified odor-free photocuring pipeline repairing material processing device |
| CN113370419B (en) * | 2021-08-02 | 2022-04-26 | 浙江优为新材料有限公司 | Hyperbranched resin modified odor-free photocuring pipeline repairing material processing device |
| CN114308882A (en) * | 2022-01-21 | 2022-04-12 | 德清县诚达金属材料有限公司 | Carpet washing is cleaning device of clearance end of a thread for groove |
| CN115193320A (en) * | 2022-07-12 | 2022-10-18 | 青岛花帝食品配料有限公司 | Preparation device of functional seasoning for preventing and treating dyspepsia |
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Application publication date: 20200922 |