CN107577286A - A kind of computer host box dust arrester and its method of work - Google Patents

A kind of computer host box dust arrester and its method of work Download PDF

Info

Publication number
CN107577286A
CN107577286A CN201710727159.7A CN201710727159A CN107577286A CN 107577286 A CN107577286 A CN 107577286A CN 201710727159 A CN201710727159 A CN 201710727159A CN 107577286 A CN107577286 A CN 107577286A
Authority
CN
China
Prior art keywords
air
diffusion apparatus
main frame
cover plate
frame cover
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.)
Granted
Application number
CN201710727159.7A
Other languages
Chinese (zh)
Other versions
CN107577286B (en
Inventor
陈彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weifang University
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201710727159.7A priority Critical patent/CN107577286B/en
Publication of CN107577286A publication Critical patent/CN107577286A/en
Application granted granted Critical
Publication of CN107577286B publication Critical patent/CN107577286B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Ventilation (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The invention discloses a kind of computer host box dust arrester and its method of work, including main frame cover plate, four symmetrical synchronous pulleys are connected with the medial surface of main frame cover plate, timing belt is connected with synchronous pulley, air diffusion apparatus is connected on the same side of four straightways of timing belt, the central part of the medial surface of main frame cover plate is provided with dispensing device, dispensing device is connected by soft air pipe with air diffusion apparatus respectively, the marginal position of the medial surface of main frame cover plate is respectively equipped with steam vent, air blower is respectively equipped with the lateral surface of main frame cover plate, motor, negative-pressure air fan, switch, bag dust filter and air guide channel, air blower is connected with dispensing device, negative-pressure air fan is connected with air guide channel and bag dust filter respectively, motor is connected with one in synchronous pulley.The present invention can form the tornado flow of positive and negative alternate, dust is cleaned in time, avoid dust from accumulating, and prevent take up the inner space of mainframe box, highly effective.

Description

A kind of computer host box dust arrester and its method of work
Technical field
The present invention relates to field of computer technology, more particularly to a kind of computer host box dust arrester and its work side Method.
Background technology
The main frame of desktop computer can constantly accumulate substantial amounts of dust, if clearing up not in time, no during long-term work The heat dispersion of mainframe box is only influenceed, causes the operation troubles such as main shut-down system, can also influence the reliable of main frame internal wiring connection Property, make main frame there is loose contact and can not normal boot-strap and the problem of use, therefore the dust inside mainframe box should be clear in time Reason, avoid accumulation from precipitating, made troubles to later stage cleaning.
The content of the invention
The invention aims to solve shortcoming present in prior art, and a kind of computer host box proposed removes Dirt device and its method of work.
To achieve these goals, present invention employs following technical scheme:
A kind of computer host box dust arrester, including main frame cover plate, are connected with the medial surface of the main frame cover plate pair Claim four synchronous pulleys of distribution, be connected with timing belt on the synchronous pulley, four straightways of the timing belt it is same Air diffusion apparatus is connected on side, guide pillar frame is respectively equipped with the outside of four straightways of the timing belt and is erected at and is led Guide pillar on pylon, the head of the air diffusion apparatus are socketed on guide pillar, and the central part of the medial surface of the main frame cover plate is set There is dispensing device, the four sides of the dispensing device is respectively equipped with outlet connector, and the outlet connector passes through soft air pipe respectively It is connected with the afterbody of air diffusion apparatus, top, left side and the right side edge position of the medial surface of the main frame cover plate are set respectively Have uniformly densely covered steam vent, be respectively equipped with the lateral surface of the main frame cover plate air blower, motor, negative-pressure air fan, Switch, bag dust filter and the air guide channel covered on the outside of steam vent, the output end of the air blower and the input phase of dispensing device Connection, the input and output end of the negative-pressure air fan are connected with air guide channel and bag dust filter respectively, the motor Output end is connected with the rotating shaft of one in synchronous pulley.
Preferably, the guide pillar is that section is equilateral triangle or square or regular hexagon.
Preferably, the air diffusion apparatus is " F " shape structure, and its head side is provided with what is matched with guide pillar cross sectional shape Guide hole, the guide pillar are socketed in guide hole, and the neck side of air diffusion apparatus is fixedly connected on the lateral surface of timing belt.
Preferably, the inside of the air diffusion apparatus is provided with vent line, and the lateral surface of air diffusion apparatus is provided with some uniform The air dispelling hole of distribution, the air dispelling hole communicate with vent line respectively, and the input of the vent line is connected with soft air pipe.
Preferably, it is respectively equipped with baffle plate on the inside of four straightways of the timing belt.
Preferably, the inner side of the guide pillar frame is respectively equipped with proximity switch, the head of the air diffusion apparatus at the both ends of guide pillar It is respectively equipped with portion two sides close to induction installation.
Preferably, the proximity switch is in four of the same pendant positions of guide pillar parallel connections, and two groups of switches respectively with The positive and reverse rotation control circuit of motor is connected.
Preferably, the air blower, motor, negative-pressure air fan respectively with switch be electrically connected with, the switch it is another End is provided with the power connection to match with mainframe box power supply.
The method of work of above computer mainframe box dust arrester:Power connection on switch is connected with mainframe box power supply Connect, and main frame cover plate is fixedly connected on mainframe box, it is synchronous by lower switch, then dust arrester energization, motor driving Belt wheel rotates, so that timing belt moves linearly, drives four air diffusion apparatus while clockwise direction mainframe box on timing belt The center of cover plate, which is drawn close, to be moved or disperses to move to the edge of main frame cover plate counterclockwise simultaneously, the proximity switch inspection on guide pillar frame The extreme position of air diffusion apparatus is surveyed and limited, and controls the deflecting of motor to rotate, so as to realize the reciprocal fortune of air diffusion apparatus Dynamic, high pressure draught is delivered to air diffusion apparatus by air blower and negative-pressure air fan work, air blower respectively by dispensing device and soft air pipe In, and an exhaust stream is formed by air dispelling hole in air diffusion apparatus, during the reciprocating of air diffusion apparatus, air diffusion apparatus Air-flow carries out blanket type dedusting to the electric component surface inside mainframe box, and the air dispelling hole of four air diffusion apparatus cooperatively forms The alternately tornado flow of commutation, makes the dust inside mainframe box constantly kick up, negative-pressure air fan makes shape at steam vent by air guide channel The negative-pressure air-flow outside into direction, the dust granule flown upward follow negative-pressure air-flow to enter by air guide channel in bag dust filter, make machine Dust inside case is cleaned and concentrated in time storage.
In the present invention, using the reciprocating motion of four air diffusion apparatus in upper and lower, left and right, and gather simultaneously and disperse, formed It the tornado flow of positive and negative alternate, the dust inside mainframe box is constantly kicked up, and be arranged by the negative pressure of top and both sides Stomata is drawn onto outside mainframe box, the dust of cabinet inside is cleaned in time;Dust scale removal process with it is electric inside mainframe box Part works simultaneously, effectively dust can be avoided to accumulate, while contribute to cabinet inside to radiate;Dust arrester is arranged on main frame case lid The inner side of plate, prevents take up the inner space of mainframe box, does not influence the dismounting of mainframe box internal electrical components, highly effective.
Brief description of the drawings
Fig. 1 is the medial surface structural representation of the present invention.
Fig. 2 is the lateral surface structural representation of the present invention.
In figure:1 main frame cover plate, 2 synchronous pulleys, 3 timing belts, 4 air diffusion apparatus, 5 guide pillars, 6 dispensing devices, 7 soft air pipes, 8 air blowers, 9 steam vents, 10 negative-pressure air fans, 11 bag dust filters, 12 air guide channels, 13 air dispelling holes, 14 motors, 15 switches, 16 Guide pillar frame, 17 baffle plates.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.
Reference picture 1-2, a kind of computer host box dust arrester, including main frame cover plate 1, the inner side of main frame cover plate 1 Four symmetrical synchronous pulleys 2 are connected with face, timing belt 3, four straight lines of timing belt 3 are connected with synchronous pulley 2 The inner side of section is respectively equipped with baffle plate 17, is connected to air diffusion apparatus 4 on the same side of four straightways of timing belt 3, together Walk and be respectively equipped with guide pillar frame 16 and the guide pillar 5 being erected on guide pillar frame 16 on the outside of four straightways of band 3, guide pillar 5 is section For equilateral triangle or square or regular hexagon, the head of air diffusion apparatus 4 is socketed on guide pillar 5, and air diffusion apparatus 4 is " F " shape knot Structure, its head side are provided with the guide hole to match with the cross sectional shape of guide pillar 5, and guide pillar 5 is socketed in guide hole, air diffusion apparatus 4 Neck side is fixedly connected on the lateral surface of timing belt 3, and the inner side of guide pillar frame 16 is respectively equipped with close open at the both ends of guide pillar 5 Close, proximity switch is respectively equipped with four of 5 same pendant positions of guide pillar parallel connections, the head on both sides face of air diffusion apparatus 4 Close to induction installation, the central part of the medial surface of main frame cover plate 1 is provided with dispensing device 6, and the four sides of dispensing device 6 is respectively equipped with Outlet connector, outlet connector are connected by soft air pipe 7 with the afterbody of air diffusion apparatus 4 respectively, and the inside of air diffusion apparatus 4 is set Have a vent line, the lateral surface of air diffusion apparatus 4 is provided with some equally distributed air dispelling holes 13, air dispelling hole 13 respectively with breather pipe Road communicates, and the input of vent line is connected with soft air pipe 7, top, left side and the right edge of the medial surface of main frame cover plate 1 Edge position is respectively equipped with uniformly densely covered steam vent 9, and air blower 8, motor are respectively equipped with the lateral surface of main frame cover plate 1 14th, negative-pressure air fan 10, switch 15, bag dust filter 11 and the air guide channel 12 for covering on the outside of steam vent 9, the output end of air blower 8 with The input of dispensing device 6 is connected, the input and output end of negative-pressure air fan 10 respectively with air guide channel 12 and bag dust filter 11 It is connected, the output end of motor 14 is connected with the rotating shaft of one in synchronous pulley 2, and two groups of switches are electric with driving respectively The positive and reverse rotation control circuit of machine 14 is connected, and air blower 8, motor 14, negative-pressure air fan 10 are electrically connected with switch 15 respectively, The other end of switch 15 is provided with the power connection to match with mainframe box power supply.
The method of work of the present invention:In the use of the present invention, the power connection switched on 15 is connected with mainframe box power supply Connect, and main frame cover plate 1 is fixedly connected on mainframe box, by lower switch 15, then dust arrester energization, motor 14 drive Synchronous pulley 2 rotates, so that timing belt 3 moves linearly, drives four air diffusion apparatus 4 on timing belt 3 simultaneously clockwise Drawn close to the center of main frame cover plate 1 and move or disperse to move to the edge of main frame cover plate 1 counterclockwise simultaneously, on guide pillar frame 16 Proximity switch detection and limitation air diffusion apparatus 4 extreme position, and control the deflecting of motor 14 to rotate, it is scattered so as to realize The reciprocating motion of device of air 4, air blower 8 and negative-pressure air fan 10 are worked, and high pressure draught is passed through dispensing device 6 and soft by air blower 8 Tracheae 7 is delivered in air diffusion apparatus 4 respectively, and forms an exhaust stream by the air dispelling hole 13 in air diffusion apparatus 4, in air diffusion apparatus 4 Reciprocate during, the air-flow of air diffusion apparatus 4 carries out blanket type dedusting to the electric component surface inside mainframe box, four The air dispelling hole 13 of air diffusion apparatus 4 cooperatively forms the tornado flow of alternately commutation, the dust inside mainframe box is constantly kicked up, and bears Pressure fan 10 makes to form the outside negative-pressure air-flow in direction at steam vent 9 by air guide channel 12, and the dust granule flown upward follows negative Pressure gas stream is entered in bag dust filter 11 by air guide channel 12, the dust of cabinet inside is cleaned and concentrate in time storage.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto, Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.

Claims (9)

1. a kind of computer host box dust arrester, including main frame cover plate(1), it is characterised in that:The main frame cover plate(1) Medial surface on be connected with four symmetrical synchronous pulleys(2), the synchronous pulley(2)On be connected with timing belt(3), institute State timing belt(3)Four straightways same side on be connected to air diffusion apparatus(4), the timing belt(3)Four Guide pillar frame is respectively equipped with the outside of straightway(16)Be erected at guide pillar frame(16)On guide pillar(5), the air diffusion apparatus(4)'s Head is socketed in guide pillar(5)On, the main frame cover plate(1)The central part of medial surface be provided with dispensing device(6), it is described to divide gas Device(6)Four sides be respectively equipped with outlet connector, the outlet connector passes through soft air pipe respectively(7)With air diffusion apparatus(4) Afterbody be connected, the main frame cover plate(1)Medial surface top, left side and right side edge position be respectively equipped with uniformly it is close The steam vent of cloth(9), the main frame cover plate(1)Lateral surface on be respectively equipped with air blower(8), motor(14), negative pressure Blower fan(10), switch(15), bag dust filter(11)With cover on steam vent(9)The air guide channel in outside(12), the air blower(8)'s Output end and dispensing device(6)Input be connected, the negative-pressure air fan(10)Input and output end respectively with air guide Passage(12)And bag dust filter(11)It is connected, the motor(14)Output end and synchronous pulley(2)In one turn Axle is connected.
A kind of 2. computer host box dust arrester according to claim 1, it is characterised in that the guide pillar(5)To cut Face is equilateral triangle or square or regular hexagon.
A kind of 3. computer host box dust arrester according to claim 1, it is characterised in that the air diffusion apparatus(4) For " F " shape structure, its head side is provided with and guide pillar(5)The guide hole that cross sectional shape matches, the guide pillar(5)It is socketed in and leads In hole, air diffusion apparatus(4)Neck side be fixedly connected on timing belt(3)Lateral surface on.
A kind of 4. computer host box dust arrester according to claim 1 or 3, it is characterised in that the air diffusion apparatus (4)Inside be provided with vent line, air diffusion apparatus(4)Lateral surface be provided with some equally distributed air dispelling holes(13), it is described Air dispelling hole(13)Communicated respectively with vent line, the input and soft air pipe of the vent line(7)It is connected.
A kind of 5. computer host box dust arrester according to claim 1, it is characterised in that the timing belt(3)'s Baffle plate is respectively equipped with the inside of four straightways(17).
A kind of 6. computer host box dust arrester according to claim 1, it is characterised in that the guide pillar frame(16)'s Inner side is in guide pillar(5)Both ends be respectively equipped with proximity switch, the air diffusion apparatus(4)Head on both sides face on be respectively equipped with it is close Induction installation.
7. a kind of computer host box dust arrester according to claim 5, it is characterised in that the proximity switch is being led Post(5)Four of same pendant positions parallel connections, and two groups of switches respectively with motor(14)Positive and reverse rotation control circuit It is connected.
A kind of 8. computer host box dust arrester according to claim 1, it is characterised in that the air blower(8), drive Dynamic motor(14), negative-pressure air fan(10)Respectively with switch(15)It is electrically connected with, the switch(15)The other end be provided with and main frame The power connection that case power supply matches.
A kind of 9. method of work of the dust arrester of computer host box according to claim 1:Will switch(15)On power supply Joint is connected with mainframe box power supply, and by main frame cover plate(1)It is fixedly connected on mainframe box, by lower switch(15), then remove Dirt device is powered, motor(14)Drive synchronous pulley(2)Rotate, so that timing belt(3)Rectilinear movement, driving are synchronous Band(3)On four air diffusion apparatus(4)Clockwise direction main frame cover plate simultaneously(1)Center draw close it is mobile or simultaneously counterclockwise to Main frame cover plate(1)The scattered movement in edge, guide pillar frame(16)On proximity switch detection and limitation air diffusion apparatus(4)The limit Position, and control motor(14)Deflecting rotate, so as to realize air diffusion apparatus(4)Reciprocating motion, air blower(8)With it is negative Pressure fan(10)Work, air blower(8)High pressure draught is passed through into dispensing device(6)And soft air pipe(7)Air diffusion apparatus is delivered to respectively (4)In, and pass through air diffusion apparatus(4)On air dispelling hole(13)An exhaust stream is formed, in air diffusion apparatus(4)Reciprocate process In, air diffusion apparatus(4)Air-flow to inside mainframe box electric component surface carry out blanket type dedusting, four air diffusion apparatus(4) Air dispelling hole(13)The tornado flow of alternately commutation is cooperatively formed, the dust inside mainframe box is constantly kicked up, negative-pressure air fan (10)Pass through air guide channel(12)Make steam vent(9)Place forms the outside negative-pressure air-flow in direction, and the dust granule flown upward follows negative Pressure gas stream passes through air guide channel(12)Into bag dust filter(11)In, the dust of cabinet inside is cleaned and concentrate in time storage.
CN201710727159.7A 2017-08-23 2017-08-23 Computer mainframe dust removal device and working method thereof Expired - Fee Related CN107577286B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710727159.7A CN107577286B (en) 2017-08-23 2017-08-23 Computer mainframe dust removal device and working method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710727159.7A CN107577286B (en) 2017-08-23 2017-08-23 Computer mainframe dust removal device and working method thereof

Publications (2)

Publication Number Publication Date
CN107577286A true CN107577286A (en) 2018-01-12
CN107577286B CN107577286B (en) 2020-05-08

Family

ID=61035110

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710727159.7A Expired - Fee Related CN107577286B (en) 2017-08-23 2017-08-23 Computer mainframe dust removal device and working method thereof

Country Status (1)

Country Link
CN (1) CN107577286B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110877037A (en) * 2018-09-05 2020-03-13 邯郸学院 Closed computer host dust collector
CN111023940A (en) * 2019-12-10 2020-04-17 宁德师范学院 Size detection device with dust removal function for computer mainframe box production
CN111532868A (en) * 2020-05-15 2020-08-14 徐岳斌 Dust collection system and dust collection method of slitting rewinder
CN112570375A (en) * 2020-11-13 2021-03-30 浪潮电子信息产业股份有限公司 Server dust collector
WO2023142280A1 (en) * 2022-01-26 2023-08-03 深圳市潘道生物科技有限公司 Easily cleaned pcr tester

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2757218Y (en) * 2004-12-25 2006-02-08 富准精密工业(深圳)有限公司 Computer ssytem air guide device
CN101524686A (en) * 2009-04-10 2009-09-09 南京普天长乐通信设备有限公司 Automatic dust-removing structure used in outdoor machine cabinet/box
US20140004785A1 (en) * 2012-06-28 2014-01-02 Hon Hai Precision Industry Co., Ltd. Container data center
CN204667302U (en) * 2015-06-05 2015-09-23 呼和浩特民族学院 A kind of computer host box of high efficiency and heat radiation
CN105183099A (en) * 2015-11-02 2015-12-23 黄�俊 Computer host capable of automatically dedusting
CN106944416A (en) * 2017-05-15 2017-07-14 汪国栋 Dust arrester after a kind of computer host box assembling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2757218Y (en) * 2004-12-25 2006-02-08 富准精密工业(深圳)有限公司 Computer ssytem air guide device
CN101524686A (en) * 2009-04-10 2009-09-09 南京普天长乐通信设备有限公司 Automatic dust-removing structure used in outdoor machine cabinet/box
US20140004785A1 (en) * 2012-06-28 2014-01-02 Hon Hai Precision Industry Co., Ltd. Container data center
CN204667302U (en) * 2015-06-05 2015-09-23 呼和浩特民族学院 A kind of computer host box of high efficiency and heat radiation
CN105183099A (en) * 2015-11-02 2015-12-23 黄�俊 Computer host capable of automatically dedusting
CN106944416A (en) * 2017-05-15 2017-07-14 汪国栋 Dust arrester after a kind of computer host box assembling

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110877037A (en) * 2018-09-05 2020-03-13 邯郸学院 Closed computer host dust collector
CN111023940A (en) * 2019-12-10 2020-04-17 宁德师范学院 Size detection device with dust removal function for computer mainframe box production
CN111023940B (en) * 2019-12-10 2021-05-28 宁德师范学院 Size detection device with dust removal function for computer mainframe box production
CN111532868A (en) * 2020-05-15 2020-08-14 徐岳斌 Dust collection system and dust collection method of slitting rewinder
CN112570375A (en) * 2020-11-13 2021-03-30 浪潮电子信息产业股份有限公司 Server dust collector
WO2023142280A1 (en) * 2022-01-26 2023-08-03 深圳市潘道生物科技有限公司 Easily cleaned pcr tester

Also Published As

Publication number Publication date
CN107577286B (en) 2020-05-08

Similar Documents

Publication Publication Date Title
CN107577286A (en) A kind of computer host box dust arrester and its method of work
CN207057188U (en) A kind of instrument and meter dust exhaust apparatus
CN205227581U (en) Fresh air haze removing machine
CN208495091U (en) A kind of motor dust-extraction unit preventing dust
CN1333205C (en) Air purifier
CN206073801U (en) Vent dust arrester
JP2004286345A (en) Filter device of air conditioner
CN207040252U (en) Jujube harvesting apparatus
JP2004263984A (en) Air conditioner
CN103027638A (en) Dust collector with independent internal ventilating system
CN104669120A (en) Grinding machine with dust removal device
CN107744692A (en) A kind of exhaust-gas treatment cyclone dust collectors
CN100338399C (en) Air conditioner having indoor unit with automatic air filter-cleaning function
CN203964316U (en) Filtering screen dust-cleaning device and air-conditioner
CN102527678A (en) Lead pig dust cleaning device for lead pig granulator
CN201687738U (en) Dust-proofing axial fan device
CN212268909U (en) Dust removal system for transfer point of belt conveyor
CN109926424A (en) A kind of new material manual processing dust-extraction unit
CN107283320A (en) A kind of abrasive machine with dust arrester
CN107036202A (en) A kind of indoor air-purification device
CN203000806U (en) Dust collector with independent interior ventilating system
CN111924582A (en) Dust removal system for transfer point of belt conveyor
CN207463673U (en) A kind of dedusting spray code spraying apparatus of foam board surface dust
CN206229131U (en) One kind utilizes water wind dedusting equipment integrating
CN205481531U (en) Ventilation equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information
CB03 Change of inventor or designer information

Inventor after: Wang Xin

Inventor after: Chen Bin

Inventor before: Chen Bin

TA01 Transfer of patent application right
TA01 Transfer of patent application right

Effective date of registration: 20200409

Address after: 261000 no.5147, Dongfeng East Street, high tech Zone, Weifang City, Shandong Province

Applicant after: WEIFANG University

Address before: 712000 Xianyang province Shaanxi City Weicheng District West Northwest Cotton Factory No. 1 Building 3 unit 508 room

Applicant before: Chen Bin

GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20200508