CN214076404U - A screeding device for mining machinery with automatic feeding - Google Patents

A screeding device for mining machinery with automatic feeding Download PDF

Info

Publication number
CN214076404U
CN214076404U CN202022749295.6U CN202022749295U CN214076404U CN 214076404 U CN214076404 U CN 214076404U CN 202022749295 U CN202022749295 U CN 202022749295U CN 214076404 U CN214076404 U CN 214076404U
Authority
CN
China
Prior art keywords
fixedly connected
motor
box body
mining machinery
box
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
CN202022749295.6U
Other languages
Chinese (zh)
Inventor
钱仲庆
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.)
Suzhou Shipute Automation Equipment Co ltd
Original Assignee
Suzhou Shipute Automation Equipment 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 Suzhou Shipute Automation Equipment Co ltd filed Critical Suzhou Shipute Automation Equipment Co ltd
Priority to CN202022749295.6U priority Critical patent/CN214076404U/en
Application granted granted Critical
Publication of CN214076404U publication Critical patent/CN214076404U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)

Abstract

本实用新型提供一种自动上料的矿山机械用匀料装置。所述自动上料的矿山机械用匀料装置,包括:外壳,所述外壳内壁的两侧分别固定连接有第一箱体和第二箱体,所述第一箱体和所述第二箱体的底部均设置有第一出料槽,所述第一箱体和所述第二箱体相对的一侧之间固定连接有第一电机,所述第一电机的输出轴固定连接有第一转动杆。本实用新型提供的自动上料的矿山机械用匀料装置方便了进行上料,只需要人工定期向第一箱体和第二箱体内部加料即可,不需要一直进行上料,节省了工作人员的劳动量,并且通过两个搅拌箱的轮流使用,能够在一个搅拌箱排料的时候,另一个搅拌箱可以匀料,加快了工作效率。

Figure 202022749295

The utility model provides a leveling device for mining machinery with automatic feeding. The automatic feeding screeding device for mining machinery includes: a casing, a first box body and a second box body are respectively fixedly connected on both sides of the inner wall of the casing, the first box body and the second box body The bottom of the body is provided with a first discharge chute, a first motor is fixedly connected between the opposite sides of the first box body and the second box body, and the output shaft of the first motor is fixedly connected with a first motor. One turn lever. The automatic feeding screeding device for mining machinery provided by the utility model is convenient for feeding, and it only needs to manually feed the inside of the first box body and the second box body regularly, and it is not necessary to carry out feeding all the time, which saves work. The amount of labor of the personnel, and through the alternate use of the two mixing boxes, when one mixing box is discharging, the other mixing box can be uniform, which speeds up the work efficiency.

Figure 202022749295

Description

Automatic material loading's refining device for mining machinery
Technical Field
The utility model relates to a refining device field especially relates to an automatic refining device for mining machinery of material loading.
Background
In recent years, the mining machinery industry in China is greatly developed, the refining device is an important component of the mining machinery, and although the production process of the existing refining device for the mining machinery is mature day by day, part of the production process is still insufficient to be improved.
Present refining device for mining machinery need artifically pour two kinds of raw materialss into the blending tank inside usually, mixes at every turn and all need carry out the material loading to waste time and energy, after mixing finishing in addition, the in-process of blending tank row material can't carry out the refining operation, thereby leads to work efficiency low.
Therefore, it is necessary to provide a leveling device for mining machinery which can automatically feed materials, so as to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatic refining device for mining machinery of material loading has solved and has needed artifical material loading to waste time and energy, and after the mixture finishes, the in-process that the blending tank arranged the material moreover, can't carry out the refining operation to lead to the problem that work efficiency is low.
In order to solve the technical problem, the utility model provides an automatic material loading's refining device for mining machinery, include: the device comprises a shell, wherein a first box body and a second box body are fixedly connected to two sides of the inner wall of the shell respectively, a first discharge chute is arranged at the bottom of each of the first box body and the second box body, a first motor is fixedly connected between one opposite sides of the first box body and the second box body, the first motor is connected with an external power supply through a control switch, the first motor is a stepping motor, the rotating angle is 90 degrees at each time, a first rotating rod is fixedly connected to an output shaft of the first motor, a circular plate is fixedly connected to the bottom end of the first rotating rod, two first through holes are formed in the bottom of the circular plate, the first through holes are matched with the first discharge chutes, a fixed frame is fixedly connected between two sides of the inner wall of the shell, two stirring boxes are fixedly connected to the bottom of the fixed frame, a U-shaped groove is slidably connected to the front surface of the inner wall of the fixed frame, and two second through holes are formed in the bottom of the inner wall of the fixed frame, the second through hole is matched with the distance between the two inclined plates, and the two second through holes are respectively positioned at the tops of the two stirring boxes.
Preferably, the two sides of the inner wall of the U-shaped groove are fixedly connected with inclined plates.
Preferably, the equal fixedly connected with support frame in both sides of fixed frame inner wall, it is connected with the second dwang to rotate between the front and the back of support frame inner wall, the outer fixed surface of second dwang is connected with the reel, the surface winding of reel has the metal rope, and the other end of two metal ropes is fixed in respectively the both sides in U type groove, the other end of second dwang runs through in proper order the support frame with fixed frame extends to the back of fixed frame, the second dwang extends to the first belt pulley of one end fixedly connected with at the fixed frame back.
Preferably, the back of fixed frame passes through motor cabinet fixedly connected with second motor, and the second motor passes through control switch and is connected with external power supply, and the second motor is servo motor, the output shaft fixedly connected with second belt pulley of second motor is provided with the belt between second belt pulley and two first belt pulleys.
Preferably, two the bottom of agitator tank inner wall all rotates and is connected with the puddler, the bottom of puddler runs through the agitator tank and extends to the bottom of agitator tank, the bottom fixedly connected with third belt pulley of puddler.
Preferably, the bottom fixedly connected with third motor of shell inner wall, the third motor passes through control switch and is connected with external power, the output shaft fixedly connected with fourth belt pulley of third motor, be provided with the belt between fourth belt pulley and two third belt pulleys.
Preferably, one side of the bottom of each stirring box is provided with a second discharging groove.
Compared with the prior art, the utility model provides an automatic material loading's refining device for mining machinery has following beneficial effect:
the utility model provides an automatic feeding refining device for mining machinery, through the start of first motor, the first motor rotates and drives the plectane and rotate, and then drives two first through-holes and two first blown down tanks align, make first box and second box ejection of compact, the raw materials fall into U type inslot, through the start of second motor, the second motor rotates and makes two second dwangs rotate, thereby make two reels rotate, make left metal rope receive the line, the metal rope unwrapping wire on the right side, and then drive U type groove and move left, after U type groove and second through-hole align, arrange the raw materials into left agitator tank; through the starting of the third motor, the third motor rotates to drive the two stirring rods to rotate, so as to drive the raw materials to be stirred and mixed, after the raw materials are mixed, the raw materials are discharged into the U-shaped groove through the restarting of the first motor, the two reels are driven to rotate reversely through the reverse rotation of the second motor, the pole lugs enable the left metal rope to be paid off, the right metal rope is taken up to drive the U-shaped groove to move rightwards, the raw materials are discharged into the right stirring box, the left raw materials can be discharged, the right raw materials can be continuously stirred and mixed, the circulation is carried out in sequence, the first box body and the second box body are controlled to discharge materials through the first motor, the feeding is convenient, only the manual feeding is needed to be carried out to the inner parts of the first box body and the second box body, the feeding is not needed all the time, the labor of workers is saved, and the two stirring boxes can be used alternately through the amount of the two stirring boxes, can be when a agitator tank arranges the material, another agitator tank can the refining for work efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the refining device for the mining machine with automatic feeding according to the present invention;
FIG. 2 is a top view of the circular plate shown in FIG. 1;
figure 3 is a schematic structural view of the fixed frame shown in figure 1;
figure 4 is a top view of the fixing frame shown in figure 3.
Reference numbers in the figures: 1. a housing; 2. a first case; 3. a second case; 4. a first discharge chute; 5. a first motor; 6. a first rotating lever; 7. a circular plate; 8. a first through hole; 9. a fixing frame; 10. a stirring box; 11. a U-shaped groove; 12. a second through hole; 13. a sloping plate; 14. a support frame; 15. a second rotating lever; 16. a reel; 17. a metal cord; 18. a first pulley; 19. a second motor; 20. a second pulley; 21. a stirring rod; 22. a third belt pulley; 23. a third motor; 24. a fourth belt pulley; 25. and a second discharge chute.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
Please refer to fig. 1, fig. 2, fig. 3 and fig. 4, wherein fig. 1 is a schematic structural diagram of a refining apparatus for an automatic feeding mining machine according to a preferred embodiment of the present invention; FIG. 2 is a top view of the circular plate shown in FIG. 1; figure 3 is a schematic structural view of the fixed frame shown in figure 1; figure 4 is a top view of the fixing frame shown in figure 3. The automatic material loading's refining device for mining machinery includes: a shell 1, wherein a first box body 2 and a second box body 3 are respectively and fixedly connected with two sides of the inner wall of the shell 1, the bottoms of the first box body 2 and the second box body 3 are both provided with a first discharge chute 4, a first motor 5 is fixedly connected between the opposite sides of the first box body 2 and the second box body 3, a first rotating rod 6 is fixedly connected with an output shaft of the first motor 5, a circular plate 7 is fixedly connected with the bottom end of the first rotating rod 6, two first through holes 8 are arranged at the bottom of the circular plate 7, a fixing frame 9 is fixedly connected between two sides of the inner wall of the shell 1, the bottom of the fixed frame 9 is fixedly connected with two stirring boxes 10, the front surface of the inner wall of the fixed frame 9 is connected with a U-shaped groove 11 in a sliding way, two second through holes 12 are formed in the bottom of the inner wall of the fixing frame 9, and the two second through holes 12 are located at the tops of the two stirring boxes 10 respectively.
The equal fixedly connected with swash plate 13 in both sides of 11 inner walls in U type groove can play the effect of direction through setting up of two swash plates 13 for the raw materials can pass through the inclined plane landing.
The equal fixedly connected with support frame 14 in both sides of fixed frame 9 inner wall, it is connected with second dwang 15 to rotate between the front and the back of support frame 14 inner wall, the outer fixed surface of second dwang 15 is connected with reel 16, the surface winding of reel 16 has wire rope 17, and two wire rope 17's the other end is fixed in respectively the both sides of U type groove 11, the other end of second dwang 15 runs through in proper order the support frame 14 with fixed frame 9 extends to the back of fixed frame 9, second dwang 15 extends to the first belt pulley 18 of one end fixedly connected with at the fixed frame 9 back.
The back of fixed frame 9 passes through motor cabinet fixedly connected with second motor 19, the output shaft fixedly connected with second belt pulley 20 of second motor 19, and the diameter of second belt pulley 20 is greater than the diameter of two first belt pulleys 18 for second belt pulley 20 is rotatory, can stably drive two first belt pulleys 18 rotatory, can not appear skidding.
Two the bottom of agitator tank 10 inner wall all rotates and is connected with puddler 21, the bottom of puddler 21 runs through agitator tank 10 and extend to the bottom of agitator tank 10, the bottom fixedly connected with third belt pulley 22 of puddler 21, through the rotation of puddler 21, can mix two kinds of raw materials of agitator tank 10 inside.
The bottom fixedly connected with third motor 23 of shell 1 inner wall, the output shaft fixedly connected with fourth belt pulley 24 of third motor 23, the diameter of fourth belt pulley 24 is greater than the diameter of two third belt pulleys 22 for fourth belt pulley 24 is rotatory, can stably drive two third belt pulleys 22 rotatory, can not appear skidding.
Two one side of agitator tank 10 bottom all is provided with second blown down tank 25, and the setting of second blown down tank 25 is used for agitator tank 10 to discharge the raw materials that mix.
The utility model provides an automatic material loading's refining device for mining machinery's theory of operation as follows:
by starting the first motor 5, the first motor 5 rotates to drive the circular plate 7 to rotate, and further drives the two first through holes 8 to align with the two first discharge chutes 4, so that the first box body 2 and the second box body 3 discharge materials, the raw materials fall into the U-shaped groove 11, by starting the second motor 19, the second motor 19 rotates to drive the two second rotating rods 15 to rotate, so that the two reels 16 rotate, the left metal rope 17 is wound up, the right metal rope 17 is wound off, and the U-shaped groove 11 is further driven to move leftwards, and after the U-shaped groove 11 is aligned with the second through holes 12, the raw materials are discharged into the left stirring box 10;
through the start-up of third motor 23, the rotation of third motor 23 drives two puddler 21 rotatoryly, thereby it stirs the mixture to drive the raw materials, after the raw materials mixes and finishes, through the restart of first motor 5, arrange the raw materials into U type groove 11, reverse rotation through second motor 19 drives two reel 16 reverse rotations, utmost point ear makes left metal rope 17 unwrapping wire, the metal rope 17 receipts line on right side, and then drive U type groove 11 and remove right, in arranging the raw materials into the agitator tank 10 on right side, left raw materials can discharge, the raw materials on the right can continue to stir the mixture, cycle in proper order.
Compared with the prior art, the utility model provides an automatic material loading's refining device for mining machinery has following beneficial effect:
by starting the first motor 5, the first motor 5 rotates to drive the circular plate 7 to rotate, and further drives the two first through holes 8 to align with the two first discharge chutes 4, so that the first box body 2 and the second box body 3 discharge materials, the raw materials fall into the U-shaped groove 11, by starting the second motor 19, the second motor 19 rotates to drive the two second rotating rods 15 to rotate, so that the two reels 16 rotate, the left metal rope 17 is wound up, the right metal rope 17 is wound off, and the U-shaped groove 11 is further driven to move leftwards, and after the U-shaped groove 11 is aligned with the second through holes 12, the raw materials are discharged into the left stirring box 10; the third motor 23 is started to rotate to drive the two stirring rods 21 to rotate, so as to drive the raw materials to be stirred and mixed, after the raw materials are mixed, the raw materials are discharged into the U-shaped groove 11 by the re-starting of the first motor 5, the two reels 16 are driven to rotate reversely by the reverse rotation of the second motor 19, the tabs enable the metal rope 17 on the left side to be paid off, the metal rope 17 on the right side to be taken up, the U-shaped groove 11 is driven to move rightwards, the raw materials are discharged into the stirring box 10 on the right side, the raw materials on the left side can be discharged, the raw materials on the right side can be continuously stirred and mixed, the process is circulated in sequence, the first box 2 and the second box 3 are controlled to discharge materials by the first motor 5, the feeding is convenient, only manual feeding is needed to be carried out inside the first box 2 and the second box 3, the feeding is not needed all the time, and the labor amount of workers is saved, and through the use in turn of two agitator tanks 10, can be when a agitator tank 10 row material, another agitator tank 10 can the refining for work efficiency.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (7)

1.一种自动上料的矿山机械用匀料装置,包括:外壳(1),其特征在于:所述外壳(1)内壁的两侧分别固定连接有第一箱体(2)和第二箱体(3),所述第一箱体(2)和所述第二箱体(3)的底部均设置有第一出料槽(4),所述第一箱体(2)和所述第二箱体(3)相对的一侧之间固定连接有第一电机(5),所述第一电机(5)的输出轴固定连接有第一转动杆(6),所述第一转动杆(6)的底端固定连接有圆板(7),所述圆板(7)的底部开设有两个第一通孔(8),所述外壳(1)内壁的两侧之间固定连接有固定框(9),所述固定框(9)的底部固定连接有两个搅拌箱(10),所述固定框(9)内壁的正面滑动连接有U型槽(11),所述固定框(9)内壁的底部开设有两个第二通孔(12),两个所述第二通孔(12)分别位于两个搅拌箱(10)的顶部。1. An automatic feeding screeding device for mining machinery, comprising: a casing (1), characterized in that: a first box body (2) and a second box body (2) and a second casing (2) and a second casing (2) and a second casing (2) and a second casing (2) and a second casing (2) are fixedly connected to both sides of the inner wall of the casing (1). The box (3), the bottom of the first box (2) and the second box (3) are provided with a first discharge chute (4), the first box (2) and the A first motor (5) is fixedly connected between the opposite sides of the second box body (3), and a first rotating rod (6) is fixedly connected to the output shaft of the first motor (5). A circular plate (7) is fixedly connected to the bottom end of the rotating rod (6). The bottom of the circular plate (7) is provided with two first through holes (8). A fixing frame (9) is fixedly connected, two stirring boxes (10) are fixedly connected to the bottom of the fixing frame (9), and a U-shaped groove (11) is slidably connected to the front of the inner wall of the fixing frame (9), so Two second through holes (12) are opened at the bottom of the inner wall of the fixing frame (9), and the two second through holes (12) are respectively located at the top of the two stirring boxes (10). 2.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,所述U型槽(11)内壁的两侧均固定连接有斜板(13)。2 . The automatic feeding screeding device for mining machinery according to claim 1 , wherein inclined plates ( 13 ) are fixedly connected to both sides of the inner wall of the U-shaped groove ( 11 ). 3 . 3.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,所述固定框(9)内壁的两侧均固定连接有支撑架(14),所述支撑架(14)内壁的正面和背面之间转动连接有第二转动杆(15),所述第二转动杆(15)的外表面固定连接有绕线轮(16),所述绕线轮(16)的外表面缠绕有金属绳(17),两个金属绳(17)的另一端分别固定于所述U型槽(11)的两侧,所述第二转动杆(15)的另一端依次贯穿所述支撑架(14)和所述固定框(9)并延伸至所述固定框(9)的背面,所述第二转动杆(15)延伸至所述固定框(9)背面的一端固定连接有第一皮带轮(18)。3. The automatic feeding screeding device for mining machinery according to claim 1, characterized in that a support frame (14) is fixedly connected to both sides of the inner wall of the fixing frame (9), and the support frame ( 14) A second rotating rod (15) is rotatably connected between the front and the back of the inner wall, and a reel (16) is fixedly connected to the outer surface of the second rotating rod (15). The reel (16) A metal rope (17) is wound around the outer surface of the two metal ropes (17), the other ends of the two metal ropes (17) are respectively fixed on both sides of the U-shaped groove (11), and the other ends of the second rotating rod (15) pass through in sequence The support frame (14) and the fixing frame (9) extend to the back of the fixing frame (9), and the second rotating rod (15) extends to one end of the back of the fixing frame (9) for fixing A first pulley (18) is connected. 4.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,所述固定框(9)的背面通过电机座固定连接有第二电机(19),所述第二电机(19)的输出轴固定连接有第二皮带轮(20)。4. The automatic feeding screeding device for mining machinery according to claim 1, characterized in that a second motor (19) is fixedly connected to the back of the fixing frame (9) through a motor seat, and the second motor (19) is fixedly connected to the back of the fixing frame (9). A second pulley (20) is fixedly connected to the output shaft of the motor (19). 5.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,两个所述搅拌箱(10)内壁的底部均转动连接有搅拌杆(21),所述搅拌杆(21)的底端贯穿所述搅拌箱(10)并延伸至所述搅拌箱(10)的底部,所述搅拌杆(21)的底端固定连接有第三皮带轮(22)。5. The self-feeding leveling device for mining machinery according to claim 1, characterized in that a stirring rod (21) is rotatably connected to the bottom of the inner walls of the two stirring boxes (10), and the stirring rod The bottom end of (21) penetrates the stirring box (10) and extends to the bottom of the stirring box (10), and the bottom end of the stirring rod (21) is fixedly connected with a third pulley (22). 6.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,所述外壳(1)内壁的底部固定连接有第三电机(23),所述第三电机(23)的输出轴固定连接有第四皮带轮(24)。6. The automatic feeding screeding device for mining machinery according to claim 1, characterized in that, a third motor (23) is fixedly connected to the bottom of the inner wall of the casing (1), and the third motor (23) ) output shaft is fixedly connected with a fourth pulley (24). 7.根据权利要求1所述的自动上料的矿山机械用匀料装置,其特征在于,两个所述搅拌箱(10)底部的一侧均设置有第二出料槽(25)。7. The self-feeding leveling device for mining machinery according to claim 1, wherein a second discharge chute (25) is provided on one side of the bottom of the two stirring boxes (10).
CN202022749295.6U 2020-11-25 2020-11-25 A screeding device for mining machinery with automatic feeding Expired - Fee Related CN214076404U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022749295.6U CN214076404U (en) 2020-11-25 2020-11-25 A screeding device for mining machinery with automatic feeding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022749295.6U CN214076404U (en) 2020-11-25 2020-11-25 A screeding device for mining machinery with automatic feeding

Publications (1)

Publication Number Publication Date
CN214076404U true CN214076404U (en) 2021-08-31

Family

ID=77452357

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022749295.6U Expired - Fee Related CN214076404U (en) 2020-11-25 2020-11-25 A screeding device for mining machinery with automatic feeding

Country Status (1)

Country Link
CN (1) CN214076404U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119263439A (en) * 2024-12-06 2025-01-07 山东澄林特环保科技有限公司 A precipitation device for producing polyaluminium chloride

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119263439A (en) * 2024-12-06 2025-01-07 山东澄林特环保科技有限公司 A precipitation device for producing polyaluminium chloride

Similar Documents

Publication Publication Date Title
CN207203934U (en) A kind of machine mixer
CN111844360A (en) Automatic concrete pouring system
CN107696283A (en) A kind of concrete central mix plant with dispensing function
CN103990398A (en) Novel fodder stirring machine
CN214076404U (en) A screeding device for mining machinery with automatic feeding
CN221314640U (en) Mortar premixing device convenient for material inlet and outlet
CN107149909A (en) It is a kind of can uniform stirring textile dyestuff mixer
CN219855271U (en) Energy-saving concrete mixing device
CN206690329U (en) A kind of efficient easily concrete central mix plant
CN210679143U (en) Concrete mixer is used in bridge engineering construction
CN213314788U (en) Intermittent feeding mechanism is used in production and processing of medical intermediate
CN220073177U (en) Automatic feeding device of resin sand mixer
CN211514163U (en) High-speed dispersion machine
CN210729253U (en) Coating stirring is with stirring dispenser
CN207273556U (en) A kind of High-efficient Stirrer for building
CN208681830U (en) A kind of new and effective concrete mixer
CN219376769U (en) Stirring and mixing device for construction site
CN217855864U (en) Mixing arrangement that ground rice raw materials mixes in advance
CN220638520U (en) Injection molding raw material mixing device
CN215782886U (en) High-efficient agitating unit for emulsion machine
CN210705307U (en) Concrete processing equipment
CN221432793U (en) Mixing device for premix
CN222624316U (en) Automatic roller machine
CN221953578U (en) A mortar mixing device
CN219788818U (en) High-speed mixing equipment for ready-mixed mortar

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: 20210831