CN209002324U - It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice - Google Patents

It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice Download PDF

Info

Publication number
CN209002324U
CN209002324U CN201821329530.0U CN201821329530U CN209002324U CN 209002324 U CN209002324 U CN 209002324U CN 201821329530 U CN201821329530 U CN 201821329530U CN 209002324 U CN209002324 U CN 209002324U
Authority
CN
China
Prior art keywords
wheel
curved surface
electric welding
side pushing
soil
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.)
Expired - Fee Related
Application number
CN201821329530.0U
Other languages
Chinese (zh)
Inventor
黄祖班
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.)
Chongyichun Water Source Agricultural Development Co Ltd
Original Assignee
Chongyichun Water Source Agricultural Development Co Ltd
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 Chongyichun Water Source Agricultural Development Co Ltd filed Critical Chongyichun Water Source Agricultural Development Co Ltd
Priority to CN201821329530.0U priority Critical patent/CN209002324U/en
Application granted granted Critical
Publication of CN209002324U publication Critical patent/CN209002324U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Soil Working Implements (AREA)

Abstract

The utility model discloses it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, its structure includes connection tripod, staying pole, rectangle main support, driving motor, curved baffle, ditching wheel, side pushing soil device, it connects tripod and is set to rectangle main support front upper place and by the vertical connection of electric welding, staying pole is set to below rectangle main support and is flexibly connected by engagement, driving motor is set to inside rectangle main support and is fixedly connected by electric welding, and curved baffle is set to the rectangle main support back lower place.The utility model passes through side pushing soil device, the outside side of soil that ditch two sides are stored in when can be by ditching pushes certain distance, and it is slightly compacted, it can prevent it from sliding back in ditch because piling height is higher, guarantee the enough depth of ditch, soil will not be too far with a distance from ditch simultaneously, convenient for the soil covering of later period planting fruit trees.

Description

It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice
Technical field
The utility model relates to planting equipment fields, more precisely, be it is a kind of based on curved surface wheel can side pushing soil fruit Tree planting furrow making dveice.
Background technique
Planting fruit trees ditcher is as convenient for a kind of for excavating the machinery of kind of planting ditch of planting fruit trees, mainly passes through Soil is dug pine by rotary digging cutter, and the soil digged up is placed on to the two sides of ditch using inertia, but the fruit tree of the prior art There are following for plantation furrow making dveice:
The mound digged up is placed on the two sides of ditch by traditional trencher, and with the depth that ditch is dug, the soil amount of stacking increases, Mound is higher, often has part soil and slides back in ditch, lead to the depth shallower of ditch, influences the plantation of later period fruit tree.
Utility model content
In view of the deficienciess of the prior art, the utility model aim be to provide it is a kind of can side pushing soil based on curved surface wheel Planting fruit trees furrow making dveice is placed on the two sides of ditch to solve the ditcher of the prior art for the mound digged up, as ditch is dug Depth, stacking soil amount increases, mound is higher, often has part soil and slides back in ditch, lead to the depth shallower of ditch, influence The defect of the plantation of later period fruit tree.
To achieve the goals above, the utility model is achieved through the following technical solutions:
It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, structure include connection tripod, support The thin end of the scroll, rectangle main support, driving motor, curved baffle, ditching wheel, side pushing soil device, the connection tripod are set to rectangle Main support front upper place and by the vertical connection of electric welding, the staying pole is set to below rectangle main support and is flexibly connected by engagement, The driving motor is set to inside rectangle main support and is fixedly connected by electric welding, after the curved baffle is set to rectangle main support Lower section, the ditching wheel are set to below curved baffle and are flexibly connected with driving motor by driving belt, the side pushing soil Device is set to ditching wheel two sides and engages flexible connection with the wheel shaft of ditching wheel by feed belt, the side pushing soil device by Crust of the device, curved surface actuation assist slide bar, pushing frame mechanism in parallel, dial native board group at described device shell, which is set to, to be dug Two upper lateral part of furrow wheel and with curved baffle inner wall by electric welding be fixedly connected, the curved surface actuation be set to crust of the device in Portion and flexible connection is engaged with the wheel shaft of ditching wheel by driving belt, the parallel auxiliary slide bar is set on curved surface actuation Upper and lower and with crust of the device inner wall by be welded it is vertical connect, pushing frame mechanism top flush mounting interior of shell and song Face actuation is fixedly connected by electric welding, and pushing frame mechanism lower part passes through electric welding connection with native plate is dialled.
As the utility model further scheme, the curved surface actuation is by power transmission belt, belt pulley, rotation Shaft, surface of revolution wheel, sliding curved surface wheel composition, described power transmission belt one end engages activity company with the wheel shaft of ditching wheel It connects, the power transmission belt other end engages flexible connection with belt pulley, and described rotary shaft one end leads to with pulley centers The vertical connection of electric welding is crossed, the rotary shaft other end flush mounting interior of shell connects with surface of revolution wheel center by the way that electric welding is vertical It connects, the sliding curved surface wheel is set to surface of revolution wheel outside and is fixedly connected with pushing frame mechanism by electric welding, realizes power Transmission, provide dynamic source for pushing.
As the utility model, further scheme, the sliding curved surface wheel, the curved surface of surface of revolution wheel are identical and opposite And set, the sliding curved surface wheel is flexibly connected with the intermeshing of the curved surface of surface of revolution wheel, is realized opposite using two and is set Curved surface wheel forms side-thrust.
As the utility model, further scheme, the parallel auxiliary slide bar are equipped with two and are respectively arranged in parallel shape Surface of revolution wheel upper and lower, the parallel auxiliary slide bar both ends are connect with crust of the device inner wall by the way that electric welding is vertical, described parallel Auxiliary slide bar through pushing frame mechanism and is slidably connected, and guarantees that it is in flat-pushing to side foreign side for dialling native plate.
As the utility model further scheme, the pushing frame mechanism by stress mobile jib, slide that perforation, return back to top bullet Spring, human-like frame composition, the stress mobile jib is in a vertical shape to be set to inside crust of the device and is connected with sliding curved surface wheel by electric welding It connects, described to slide perforation set on stress mobile jib upper and lower side and in integrated molding structure, the stress mobile jib is by sliding perforation It is connected with parallel auxiliary sliding bar, the spring that returns back to top is connected set on stress mobile jib outside and by electric welding, the people Type frame is set to below crust of the device and upper part is connected with stress mobile jib lower end by electric welding.
As the utility model further scheme, the human-like frame in fore-stock inwardly, after-poppet shape outwardly, the people Type frame lower part is welded with native plate is dialled, described group of native plate in front inwardly, rear portion shape outwardly, the front end of native plate will be dialled partially inwardly by realizing Side pushes away soil to side direction using the tilt angle for dialling native plate.
As the utility model further scheme, described group of native plate leading edge is equipped with sharp side, realizes effectively by soil to side Foreign side's scraping.
Utility model beneficial effect
Relatively in traditional planting fruit trees furrow making dveice, the utility model can will be dug by side pushing soil device The outside side of soil that ditch two sides are stored in when ditch pushes certain distance, and is slightly compacted, and can prevent it due to piling height is higher It slides back in ditch, guarantees the enough depth of ditch, while soil will not be too far with a distance from ditch, is covered convenient for later period planting fruit trees with soil Lid.
Detailed description of the invention
By reading referring to attached drawing detailed description of non-limiting embodiments, the other feature of the utility model, Objects and advantages will become more apparent upon.
In the accompanying drawings:
Fig. 1 be the utility model it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice structural representation Figure.
Fig. 2 is a kind of facing structure plan view of side pushing soil device of the utility model.
Fig. 3 is a kind of side structure schematic view of side pushing soil device of the utility model.
Fig. 4 is a kind of working state figure of side pushing soil device of the utility model.
In figure: connection tripod 1, staying pole 2, rectangle main support 3, driving motor 4, curved baffle 5, ditching wheel 6, side push away Native device 7 is dialled, crust of the device 71, curved surface actuation 72, parallel auxiliary slide bar 73, pushing frame mechanism 74, native plate 75 is dialled, is dynamic Power transmission belt 721, rotary shaft 723, surface of revolution wheel 724, sliding curved surface wheel 725, stress mobile jib 741, is slided belt pulley 722 Eleven punch 11 742, the spring 743 that returns back to top, human-like frame 744.
Specific embodiment
To be easy to understand the technical means, creative features, achievement of purpose, and effectiveness of the utility model, below In conjunction with specific embodiment, the utility model is further described.
As Figure 1-Figure 4, the utility model provide it is a kind of based on curved surface wheel can side pushing soil planting fruit trees ditching The technical solution of device:
As shown in Figure 1, it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, structure include connection Tripod 1, staying pole 2, rectangle main support 3, driving motor 4, curved baffle 5, ditching wheel 6, side pushing soil device 7, the company Tripod 1 is connect set on 3 front upper place of rectangle main support and by the vertical connection of electric welding, the staying pole 2 is set under rectangle main support 3 Side is flexibly connected by engagement, and the driving motor 4 is set to 3 inside of rectangle main support and is fixedly connected by electric welding, the arc Shape baffle 5 is set to 3 back lower place of rectangle main support, and the ditching wheel 6 is set to 5 lower section of curved baffle and passes through biography with driving motor 4 Dynamic belt is flexibly connected, and the side pushing soil device 7 is set to 6 two sides of ditching wheel and passes through the wheel shaft of feed belt and ditching wheel 6 Engagement is flexibly connected.
As shown in Fig. 2, the side pushing soil device 7 by crust of the device 71, curved surface actuation 72, assist slide bar in parallel 73, pushing frame mechanism 74, dial native plate 75 and form, described device shell 71 be set to 6 liang of upper lateral parts of ditching wheel and in curved baffle 5 Wall is fixedly connected by electric welding, and the curved surface actuation 72 is set to 71 inside of crust of the device and passes through driving belt and ditching Wheel 6 wheel shaft engage be flexibly connected, the parallel auxiliary slide bar 73 set on 72 upper and lower of curved surface actuation and with outside device 71 inner wall of shell passes through the vertical connection of electric welding, 74 top flush mounting shell of pushing frame mechanism, 71 inside and curved surface wheel drive machine Structure 72 is fixedly connected by electric welding, and 74 lower part of pushing frame mechanism passes through electric welding connection with native plate 75 is dialled.
As Figure 3-Figure 4, the curved surface actuation 72 is by power transmission belt 721, belt pulley 722, rotary shaft 723, surface of revolution wheel 724, sliding curved surface wheel 725 form, and described 721 one end of power transmission belt and the wheel shaft of ditching wheel 6 are nibbled It closes and is flexibly connected, 721 other end of power transmission belt engages flexible connection, described 723 one end of rotary shaft with belt pulley 722 It is connect with 722 center of belt pulley by the way that electric welding is vertical, 723 other end flush mounting shell of rotary shaft, 71 inside and rotation 724 center of curved surface wheel by the vertical connection of electric welding, the sliding curved surface wheel 725 set on 724 outside of surface of revolution wheel and with push away Pulling shelf mechanism 74 is fixedly connected by electric welding, is realized the transmission of power, is provided dynamic source for pushing.
The sliding curved surface wheel 725, the curved surface of surface of revolution wheel 724 are identical and opposite and set, the sliding curved surface wheel 725 It is flexibly connected with the intermeshing of the curved surface of surface of revolution wheel 724, realizes curved surface wheel that is opposite using two and setting, form side and push away Power.
The parallel auxiliary slide bar 73 is equipped with two and is respectively arranged on 724 upper and lower of surface of revolution wheel in parallel shape, described Parallel auxiliary 73 both ends of slide bar are connect with 71 inner wall of crust of the device by the way that electric welding is vertical, and the parallel auxiliary slide bar 73 is through pushing away It pulling shelf mechanism 74 and is slidably connected, guarantees that it is in flat-pushing to side foreign side for dialling native plate.
The pushing frame mechanism 74 by stress mobile jib 741, slide perforation 742, the spring 743 that returns back to top, human-like frame 744 form, The stress mobile jib 741 is in a vertical shape to be set to 71 inside of crust of the device and is connected with sliding curved surface wheel 725 by electric welding, described It slides perforation 742 to be set to 741 upper and lower side of stress mobile jib and be in integrated molding structure, the stress mobile jib 741 is worn by sliding Hole 742 is slidably connected with parallel auxiliary slide bar 73, and the spring 743 that returns back to top is set on 741 outside of stress mobile jib and passes through electric welding It is connected, the human-like frame 744 is set to 71 lower section of crust of the device and upper part is connected with 741 lower end of stress mobile jib by electric welding It connects.
The human-like frame 744 in fore-stock inwardly, after-poppet shape outwardly, human-like 744 lower part of frame is welded with native plate 75 is dialled Connect, described group of native plate 75 in front inwardly, rear portion shape outwardly, the front end of native plate side inwardly partially will be dialled by realizing, using dialling soil The tilt angle of plate pushes away soil to side direction.
Described group of native 75 leading edge of plate is equipped with sharp side, realizes effectively by soil to side foreign side scraping.
The soil of ditch two sides is stored in outward in conclusion the utility model is by side pushing soil device 7, when can be by ditching Side pushes certain distance, and is slightly compacted, and can prevent it from sliding back in ditch because piling height is higher, guarantees the enough depths of ditch Degree, while soil will not be too far with a distance from ditch, convenient for the soil covering of later period planting fruit trees.
It is as follows that it implements principle: connecting furrow making dveice and running gear to by connecting tripod 1, removes support The thin end of the scroll 2, furrow making dveice is ajusted, and starting motor can drive ditching wheel 6 in rotation counterclockwise, the Tu Huidui digged up at this time It is placed on 6 front two sides of ditching wheel, manipulation running gear is along going ahead;The ditching wheel 6 of rotation passes through power transmission belt simultaneously 721 drive belt pulley 722 to rotate, and belt pulley 722 drives surface of revolution wheel 724 to rotate by rotary shaft 723 again, because of surface of revolution Wheel 724 can pass through surface of revolution wheel 724 and slide the concaveconvex structure of 725 curved surface of curved surface wheel and push sliding curved surface in contorted Wheel 725 pushes outward, and springs back under the elastic reaction for the spring 743 that returns back to top, and in reciprocating motion, and slides 725 band of curved surface wheel Dynamic stress mobile jib 741 moves back and forth under the booster action of auxiliary slide bar 73 in parallel, while stress mobile jib 741 passes through human-like frame again It is in move back and forth that native plate 75 is dialled in 744 drives, and group native plate 75 is the characteristic on sharp side using the inclination and forward edge of itself, by ditch two The soil of side pushes certain distance, while slightly compacting soil outward, prevents it from sliding back in ditch.
The utility model solves the problems, such as it is that the mound digged up is placed on the two sides of ditch by the ditcher of the prior art, with The depth that ditch is dug, the soil amount of stacking increase, and mound is higher, often have part soil and slide back in ditch, lead to the depth shallower of ditch, The plantation of later period fruit tree is influenced, the utility model is combined with each other by above-mentioned component, can be by ditching by side pushing soil device When is stored in the soil of ditch two sides, and side pushes certain distance outward, and is slightly compacted, can prevent it from sliding because piling height is higher It drops back into ditch, guarantees the enough depth of ditch, while soil will not be too far with a distance from ditch, convenient for the soil covering of later period planting fruit trees.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above, for For those skilled in the art, it is clear that the present invention is not limited to the details of the above exemplary embodiments, and without departing substantially from this In the case where the spirit or essential attributes of utility model, the utility model can be realized in other specific forms.Therefore, no matter From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the utility model is by institute Attached claim rather than above description limit, it is intended that will fall within the meaning and scope of the equivalent elements of the claims All changes are embraced therein.It should not treat any reference in the claims as limiting related right It is required that.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (7)

1. it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, structure include connection tripod (1), support The thin end of the scroll (2), rectangle main support (3), driving motor (4), curved baffle (5), ditching wheel (6), side pushing soil device (7), it is special Sign is:
The connection tripod (1) is set to rectangle main support (3) front upper place and by the vertical connection of electric welding, the staying pole (2) Be flexibly connected by engagement below the rectangle main support (3), the driving motor (4) be set to rectangle main support (3) it is internal and It is fixedly connected by electric welding, the curved baffle (5) is set to rectangle main support (3) back lower place, and the ditching wheel (6) is set to arc It is flexibly connected below baffle (5) and with driving motor (4) by driving belt, the side pushing soil device (7) is set to ditching wheel (6) two sides and flexible connection with the wheel shaft of ditching wheel (6) is engaged by feed belt;
The side pushing soil device (7) by crust of the device (71), curved surface actuation (72), in parallel assist slide bar (73), push away Native plate (75) composition is dialled by pulling shelf mechanism (74), and described device shell (71) is set to (6) two upper lateral part of ditching wheel and and curved baffle (5) inner wall is fixedly connected by electric welding, and the curved surface actuation (72) is set to crust of the device (71) inside and passes through transmission Belt engages flexible connection with the wheel shaft of ditching wheel (6), and the parallel auxiliary slide bar (73) is set to curved surface actuation (72) Upper and lower and with crust of the device (71) inner wall by be welded it is vertical connect, pushing frame mechanism (74) top flush mounting shell (71) internal to be fixedly connected with curved surface actuation (72) by electric welding, pushing frame mechanism (74) lower part and group native plate (75) pass through electric welding connection.
2. it is according to claim 1 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, feature Be: the curved surface actuation (72) is bent by power transmission belt (721), belt pulley (722), rotary shaft (723), rotation (724), sliding curved surface wheel (725) composition are taken turns in face, and described power transmission belt (721) one end is engaged with the wheel shaft of ditching wheel (6) It is flexibly connected, power transmission belt (721) other end engages flexible connection, the rotary shaft (723) with belt pulley (722) One end is connect with belt pulley (722) center by the way that electric welding is vertical, in rotary shaft (723) other end flush mounting shell (71) Portion is connect with surface of revolution wheel (724) center by the way that electric welding is vertical, and the sliding curved surface wheel (725) is set to surface of revolution wheel (724) outside and with pushing frame mechanism (74) by electric welding be fixedly connected.
3. it is according to claim 2 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, feature Be: sliding curved surface wheel (725), the curved surface of surface of revolution wheel (724) are identical and opposite and set, the sliding curved surface wheel (725) it is flexibly connected with the intermeshing of the curved surface of surface of revolution wheel (724).
4. it is according to claim 1 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, feature Be: the parallel auxiliary slide bar (73) is equipped with two and is respectively arranged on surface of revolution wheel (724) upper and lower in parallel shape, described Parallel auxiliary slide bar (73) both ends are connect with crust of the device (71) inner wall by the way that electric welding is vertical, and the parallel auxiliary slide bar (73) is passed through It is through at pushing frame mechanism (74) and is slidably connected.
5. it is according to claim 1 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, feature Be: the pushing frame mechanism (74) by stress mobile jib (741), slide perforation (742), the spring that returns back to top (743), human-like frame (744) it forms, the stress mobile jib (741) is in a vertical shape to be set to crust of the device (71) inside and lead to sliding curved surface wheel (725) It crosses electric welding to be connected, described slide perforation (742) are described set on stress mobile jib (741) upper and lower side and in integrated molding structure Stress mobile jib (741) is slidably connected by sliding perforation (742) with parallel auxiliary slide bar (73), and the spring that returns back to top (743) sets It is connected in stress mobile jib (741) outside and by electric welding, the human-like frame (744) is set to below crust of the device (71) and it Top is connected with stress mobile jib (741) lower end by electric welding.
6. it is according to claim 5 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, feature Be: the human-like frame (744) in fore-stock inwardly, after-poppet shape outwardly, human-like frame (744) lower part with dial native plate (75) Welding, described group of native plate (75) in front inwardly, rear portion shape outwardly.
7. it is according to claim 1 or 6 it is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice, it is special Sign is: described group of native plate (75) leading edge is equipped with sharp side.
CN201821329530.0U 2018-08-17 2018-08-17 It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice Expired - Fee Related CN209002324U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821329530.0U CN209002324U (en) 2018-08-17 2018-08-17 It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821329530.0U CN209002324U (en) 2018-08-17 2018-08-17 It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice

Publications (1)

Publication Number Publication Date
CN209002324U true CN209002324U (en) 2019-06-21

Family

ID=66829791

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821329530.0U Expired - Fee Related CN209002324U (en) 2018-08-17 2018-08-17 It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice

Country Status (1)

Country Link
CN (1) CN209002324U (en)

Similar Documents

Publication Publication Date Title
CN110771471A (en) Automatic planting machine of sapling
CN210328463U (en) Gardens ditching device with consolidate irrigation canals and ditches function
CN209002324U (en) It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice
CN105431034B (en) Small rice transplanter carriage
CN109005774A (en) It is a kind of based on curved surface wheel can side pushing soil planting fruit trees furrow making dveice
CN103609242A (en) Multifunctional Chinese yam harvester
CN105431033B (en) Small rice transplanter carriage
CN203206708U (en) Trencher
CN111466181A (en) Urban afforestation equipment of planting trees
CN201440796U (en) Ditching device for matched use with walking tractor
CN207869649U (en) A kind of Chinese medicine plantation soil ditching device
CN203206691U (en) Machine for ditching, hilling and vine burying of grapes
CN202425320U (en) Potato and medical material excavator
CN209930876U (en) Agricultural soil digging device capable of adjusting ditching depth
CN206118364U (en) Depth stop of ditching machine
CN213694791U (en) Ditching structure for seeder
CN215269416U (en) Puncher for afforestation engineering
CN107258175B (en) Cabbage seedling digger
CN220202829U (en) Dig quick-witted whole horizon board external member
CN216700903U (en) Efficient ditching and fertilizing integrated machine device
CN210053866U (en) Potato excavating excavator with shovel head vibration structure
CN218104119U (en) Bamboo shoots planting device
CN210075990U (en) Novel vegetable planting is with ditching device
CN205567023U (en) Orchard ditcher
CN204206744U (en) Ditching machine for seeder

Legal Events

Date Code Title Description
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: 20190621

Termination date: 20210817