CN215373269U - Polyaluminium chloride drying device - Google Patents
Polyaluminium chloride drying device Download PDFInfo
- Publication number
- CN215373269U CN215373269U CN202121999081.2U CN202121999081U CN215373269U CN 215373269 U CN215373269 U CN 215373269U CN 202121999081 U CN202121999081 U CN 202121999081U CN 215373269 U CN215373269 U CN 215373269U
- Authority
- CN
- China
- Prior art keywords
- wall
- fixedly connected
- material conveying
- outer walls
- cylinder
- 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
Links
- 238000001035 drying Methods 0.000 title claims abstract description 28
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 40
- 229920000742 Cotton Polymers 0.000 claims abstract description 16
- 238000001179 sorption measurement Methods 0.000 claims abstract description 16
- 238000007790 scraping Methods 0.000 claims abstract description 11
- 238000001125 extrusion Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 6
- 238000012856 packing Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 23
- 235000017491 Bambusa tulda Nutrition 0.000 description 23
- 241001330002 Bambuseae Species 0.000 description 23
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 23
- 239000011425 bamboo Substances 0.000 description 23
- 238000005056 compaction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
Images
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The utility model discloses a polyaluminium chloride drying device which comprises a rotary motor, a main cylinder, adsorption balls and an electric hot plate, wherein the outer walls of two ends of the main cylinder are respectively and fixedly connected with a first material conveying cylinder and a second material conveying cylinder, one ends of the outer walls of the tops of the first material conveying cylinder and the second material conveying cylinder are respectively and fixedly connected with a feeding pipe, the outer wall of the other end of the first material conveying cylinder is fixedly connected with an outer box, the inner wall of one end of the outer box is fixedly connected with the rotary motor, one end of an output shaft of the rotary motor is fixedly connected with a first packing auger, the inner wall of one end of the second material conveying cylinder is rotatably connected with a second packing auger through a bearing, and the circumferential outer wall of a rotary shaft is sequentially provided with a scraping mechanism, an adsorption mechanism and an extrusion mechanism. According to the utility model, the first auger and the second auger can simultaneously convey the raw materials to the main cylinder, so that the effect of multi-directional simultaneous material conveying is realized, and the cotton hulls and the adsorption balls in the cotton hulls can absorb the water in the raw materials.
Description
Technical Field
The utility model relates to the technical field of polyaluminium chloride manufacturing, in particular to a polyaluminium chloride drying device.
Background
The polyaluminium chloride has the properties of adsorption, coagulation, precipitation and the like, is poor in stability and corrosive, has the advantages of good spray drying stability, wide applicable water range, high hydrolysis speed, strong adsorption capacity, large formed alumen ustum, high dense precipitation speed, low effluent turbidity, good dehydration performance and the like, and is very safe and reliable for drinking water of residents.
In the process of polyaluminium chloride production, fluid polyaluminium chloride needs to be dried and made into powder, most of the existing drying equipment has poor drying effect, and in the using process, the problem that the polyaluminium chloride is solidified on the inner wall of the drying equipment is easy to occur, so that the polyaluminium chloride drying device needs to be designed to solve the problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art and provides a polyaluminium chloride drying device.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a polyaluminium chloride drying device comprises a rotary motor, a main cylinder, an adsorption ball and an electric hot plate, wherein the outer walls of two ends of the main cylinder are respectively and fixedly connected with a first material conveying cylinder and a second material conveying cylinder, and one end of the outer wall of the top of the first material conveying cylinder and one end of the outer wall of the top of the second material conveying cylinder are both fixedly connected with a material inlet pipe, the outer wall of the other end of the first material conveying cylinder is fixedly connected with an outer box, the inner wall of one end of the outer box is fixedly connected with a rotating motor, one end of an output shaft of the rotating motor is fixedly connected with a first auger, the inner wall of one end of the second material conveying cylinder is rotatably connected with a second auger through a bearing, the blade directions of the first auger and the second auger are opposite, a rotating shaft is fixedly connected between the outer walls of the opposite ends of the first auger and the second auger, a scraping mechanism, an adsorption mechanism and an extrusion mechanism are sequentially arranged on the outer wall of the circumference of the rotating shaft, and a discharging mechanism is arranged in the middle of the outer wall of the bottom of the main cylinder.
Preferably, the adsorption mechanism comprises a third fixing rod, the third fixing rod is fixedly connected to the top and the bottom of the outer wall of the circumference of the rotating shaft in an equidistance distribution mode, and the top and the middle position between the outer walls of the opposite ends of the third fixing rod are connected with a rotating cylinder in a rotating mode through bearings.
Preferably, a plurality of mounting grooves that the equidistance distributes are all opened to the circumference outer wall of a section of thick bamboo that rotates, and the mounting groove is spherical, and a plurality of drying cabinets that the circumference outer wall fixedly connected with equidistance of a section of thick bamboo that rotates distributes, and the circumference outer wall of a section of thick bamboo that rotates all does not contact each other, and wherein the circumference outer wall one end of four sections of thick bamboo that rotate all does not contact with the circumference inner wall of a main section of thick bamboo.
Preferably, the circumference inner wall of mounting groove all bonds and has the cotton shell, and the cotton shell is hollow spherical, and the circumference inner wall of cotton shell all bonds and has adsorbs the ball, equal fixedly connected with electric plate between the both ends inner wall of drying cabinet.
Preferably, the extrusion mechanism comprises a first fixing rod, the first fixing rod is fixedly connected to two sides of outer walls of two ends of the rotating shaft, a compaction roller is rotatably connected between outer walls of two opposite ends of the first fixing rod through a bearing, and a circumferential outer wall of the compaction roller is in contact with a circumferential inner wall of the main cylinder.
Preferably, the scraping mechanism comprises a second fixing rod, the second fixing rod is fixedly connected to the outer walls of the two ends of the rotating shaft in an equidistant distribution mode, a scraper is fixedly connected between the outer walls of the two opposite ends of the second fixing rod and is in a triangular prism shape, and the outer wall of the top of the scraper is in contact with the inner wall of the circumference of the main cylinder.
Preferably, discharge mechanism includes the flitch down, and the flitch down is the quarter round tube shape, and the bottom outer wall of main section of thick bamboo is opened has the lower silo with flitch looks adaptation down, and the bottom outer wall fixedly connected with handle of flitch down, the equal fixedly connected with solid fixed ring in circumference outer wall both ends of first feeding cylinder and second feeding cylinder, the equal fixedly connected with support column of solid fixed ring's bottom outer wall.
The utility model has the beneficial effects that:
1. through the main section of thick bamboo that sets up, when the staff is using this device, can put in the polyaluminium chloride raw materials toward first conveying feed cylinder and second conveying feed cylinder respectively through two inlet pipes, start rotating electrical machines this moment, rotating electrical machines drives first auger and second auger and rotates simultaneously, because first auger and second auger blade opposite direction, consequently first auger and second auger can be simultaneously with the raw materials toward main section of thick bamboo transport, multi-direction simultaneously defeated effect of material has been realized, the transport efficiency of raw materials has been increased, when the raw materials is inside at the main section of thick bamboo, the rotation axis can be because the drive of first auger and the simultaneous rotation, the cotton hull that rotates a section of thick bamboo outer wall this moment and the inside absorption ball of cotton hull can absorb the moisture in the raw materials, and a section of thick bamboo and rotation axis all are in the rotation state, consequently, can improve the absorption effect to moisture by a wide margin.
2. Through the compaction cylinder that sets up, when the rotation axis is when rotatory, compaction cylinder and main section of thick bamboo inner wall contact, therefore compaction cylinder when rotatory, can carry out the compaction with the raw materials at main section of thick bamboo inner wall, the moisture that probably dopes in the raw materials can be extruded on the one hand, on the other hand can extrude the breakage to carrying out the extrusion with the raw materials, prevents to mix in the raw materials and has the caking thing, when the raw materials bonds when main section of thick bamboo inner wall, the scraper blade can be scraped the raw materials that bonds at the pivoted in-process, simple structure.
Drawings
FIG. 1 is a schematic sectional front view showing a drying apparatus for polyaluminum chloride according to example 1;
FIG. 2 is a schematic view of a rotary drum structure of a drying apparatus for polyaluminium chloride as set forth in example 1;
FIG. 3 is a schematic structural view of a heating box of the polyaluminum chloride drying device provided in example 1.
In the figure: the device comprises a rotary motor 1, a first material conveying cylinder 2, a first packing auger 3, a main cylinder 4, a material discharging plate 5, an adsorption ball 6, a second material conveying cylinder 7, a second packing auger 8, a material feeding pipe 9, a rotating cylinder 10, a cotton shell 11, a compacting roller 12, a scraping plate 13, a first fixing rod 14, a second fixing rod 15, a rotating shaft 16, a third fixing rod 17, an electric heating plate 18 and a drying box 19.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
In the description of this patent, it is noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can include, for example, fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meaning of the above terms in this patent may be understood by those of ordinary skill in the art as appropriate.
Example 1
Referring to fig. 1-3, a polyaluminium chloride drying device comprises a rotary motor 1, a main cylinder 4, an adsorption ball 6 and an electric hot plate 18, wherein the outer walls of two ends of the main cylinder 4 are respectively welded with a first material conveying cylinder 2 and a second material conveying cylinder 7, one ends of the outer walls of the tops of the first material conveying cylinder 2 and the second material conveying cylinder 7 are respectively welded with a feeding pipe 9, the outer wall of the other end of the first material conveying cylinder 2 is connected with an outer box through a bolt, the inner wall of one end of the outer box is connected with the rotary motor 1 through a bolt, one end of an output shaft of the rotary motor 1 is connected with a first auger 3 through a bolt, the inner wall of one end of the second material conveying cylinder 7 is rotatably connected with a second auger 8 through a bearing, the first auger 3 and the second auger 8 have opposite blade directions, a rotary shaft 16 is connected between the outer walls of the opposite ends of the first auger 3 and the second auger 8 through a bolt, and a scraping mechanism is sequentially arranged on the circumferential outer wall of the rotary shaft 16, The middle position of the outer wall of the bottom of the main cylinder 4 is provided with a discharging mechanism.
Wherein, adsorption apparatus includes third dead lever 17, and third dead lever 17 is equidistance distributed welding in circumference outer wall top and bottom of rotation axis 16, and top and intermediate position all are connected with a rotation section of thick bamboo 10 through the bearing rotation between the relative one end outer wall of third dead lever 17.
Wherein, the circumference outer wall that rotates a section of thick bamboo 10 all opens a plurality of mounting grooves that have the equidistance and distribute, and the mounting groove is spherical, and the circumference outer wall that rotates a section of thick bamboo 10 has a plurality of drying cabinets 19 that the equidistance distributes through bolted connection, and the circumference outer wall that rotates a section of thick bamboo 10 all does not contact each other, and wherein four circumference outer wall one ends that rotate a section of thick bamboo 10 all do not contact with the circumference inner wall of a main section of thick bamboo 4.
Wherein, the circumference inner wall of mounting groove all bonds and has cotton shell 11, and cotton shell 11 is hollow spherical, and the circumference inner wall of cotton shell 11 all bonds and has adsorbs ball 6, all has electric plate 18 through bolted connection between the both ends inner wall of drying cabinet 19.
Wherein, the extrusion mechanism includes first dead lever 14, and first dead lever 14 all welds in the both ends outer wall both sides of rotation axis 16, all is connected with compaction cylinder 12 through the bearing rotation between the relative one end outer wall of first dead lever 14, and the circumference outer wall of compaction cylinder 12 contacts with the circumference inner wall of main section of thick bamboo 4.
Wherein, scraping mechanism includes second dead lever 15, and second dead lever 15 all is equidistance distributed welding in the both ends outer wall of rotation axis 16, all has scraper blade 13 through bolted connection between the relative one end outer wall of second dead lever 15, and scraper blade 13 is the triangular prism shape, and scraper blade 13's top outer wall contacts with the circumference inner wall of main section of thick bamboo 4.
Wherein, discharge mechanism includes flitch 5 down, and down flitch 5 is the quarter pipe form, and the bottom outer wall of main section of thick bamboo 4 is opened has the feed chute with 5 looks adaptations of flitch down, and the bottom outer wall welding of flitch 5 has the handle, and first feeding cylinder 2 and the circumference outer wall both ends of second feeding cylinder 7 have all welded solid fixed ring, and solid fixed ring's bottom outer wall has all welded the support column.
The working principle is as follows: when the device is used, when a worker uses the device, the polyaluminium chloride raw material can be respectively put into the first material conveying cylinder 2 and the second material conveying cylinder 7 through the two feeding pipes 9, at the moment, the rotating motor 1 is started, the rotating motor 1 drives the first auger 2 and the second auger 8 to rotate simultaneously, and because the first auger 2 and the second auger 8 have opposite blade directions, the first auger 2 and the second auger 8 can simultaneously convey the raw material to the main cylinder 4, so that the effect of multi-direction simultaneous material conveying is realized, the conveying efficiency of the raw material is increased, when the raw material is in the main cylinder 4, the rotating shaft 16 can simultaneously rotate due to the driving of the first auger 2, at the moment, the cotton shell 11 on the outer wall of the rotating cylinder 10 and the adsorption ball 6 in the cotton shell 11 can absorb the moisture in the raw material, and the rotating cylinder 10 and the rotating shaft 16 are both in a rotating state, so that the moisture absorption effect can be greatly improved, when the rotating shaft 16 is rotating, the compaction roller 12 is in contact with the inner wall of the main barrel 4, so that the compaction roller 12 can compact the raw material on the inner wall of the main barrel 4 when rotating, on one hand, the possibly doped moisture in the raw material can be extruded, on the other hand, the raw material can be extruded and crushed, the raw material is prevented from being mixed with agglomerates, when the raw material is adhered on the inner wall of the main barrel 4, the scraper 13 can scrape the adhered raw material in the rotating process, and the structure is simple.
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 equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (7)
1. A polyaluminium chloride drying device comprises a rotary motor (1), a main cylinder (4), an adsorption ball (6) and an electric hot plate (18), and is characterized in that the outer walls of the two ends of the main cylinder (4) are respectively and fixedly connected with a first material conveying cylinder (2) and a second material conveying cylinder (7), one ends of the outer walls of the tops of the first material conveying cylinder (2) and the second material conveying cylinder (7) are respectively and fixedly connected with an inlet pipe (9), the outer wall of the other end of the first material conveying cylinder (2) is fixedly connected with an outer box, the inner wall of one end of the outer box is fixedly connected with the rotary motor (1), one end of an output shaft of the rotary motor (1) is fixedly connected with a first auger (3), the inner wall of one end of the second material conveying cylinder (7) is rotatably connected with a second auger (8) through a bearing, the blade directions of the first auger (3) and the second auger (8) are opposite, a rotary shaft (16) is fixedly connected between the outer walls of the first auger (3) and the opposite end of the second auger (8), the circumferential outer wall of the rotating shaft (16) is sequentially provided with a scraping mechanism, an adsorption mechanism and an extrusion mechanism, and the middle position of the bottom outer wall of the main cylinder (4) is provided with a discharging mechanism.
2. The polyaluminium chloride drying device according to claim 1, wherein the adsorption mechanism comprises third fixing rods (17), the third fixing rods (17) are equidistantly distributed and fixedly connected to the top and the bottom of the circumferential outer wall of the rotating shaft (16), and the rotating cylinder (10) is rotatably connected between the top and the middle position of the outer wall of the opposite end of the third fixing rods (17) through a bearing.
3. The polyaluminium chloride drying device according to claim 2, wherein the circumferential outer walls of the rotating cylinders (10) are provided with a plurality of mounting grooves which are distributed equidistantly and are spherical, the circumferential outer walls of the rotating cylinders (10) are fixedly connected with a plurality of drying boxes (19) which are distributed equidistantly, the circumferential outer walls of the rotating cylinders (10) are not contacted with each other, and one ends of the circumferential outer walls of the four rotating cylinders (10) are not contacted with the circumferential inner wall of the main cylinder (4).
4. The polyaluminium chloride drying device according to claim 3, wherein cotton shells (11) are bonded on the circumferential inner walls of the mounting grooves, the cotton shells (11) are all hollow spherical, the adsorption balls (6) are bonded on the circumferential inner walls of the cotton shells (11), and electric heating plates (18) are fixedly connected between the inner walls of two ends of the drying box (19).
5. The polyaluminium chloride drying apparatus as claimed in claim 1, wherein the extruding mechanism comprises first fixing rods (14), the first fixing rods (14) are fixedly connected to both sides of the outer walls of the two ends of the rotating shaft (16), the outer walls of the opposite ends of the first fixing rods (14) are rotatably connected with the compacting drum (12) through bearings, and the circumferential outer wall of the compacting drum (12) is in contact with the circumferential inner wall of the main drum (4).
6. The polyaluminium chloride drying device according to claim 1, wherein the scraping mechanism comprises second fixing rods (15), the second fixing rods (15) are distributed at equal intervals and fixedly connected to the outer walls of two ends of the rotating shaft (16), scraping plates (13) are fixedly connected between the outer walls of the opposite ends of the second fixing rods (15), the scraping plates (13) are triangular prism-shaped, and the outer walls of the tops of the scraping plates (13) are in contact with the inner wall of the circumference of the main cylinder (4).
7. The polyaluminium chloride drying device according to any one of claims 1 to 6, wherein the discharging mechanism comprises a lower material plate (5), the lower material plate (5) is in a shape of a quarter round tube, a lower chute matched with the lower material plate (5) is formed in the outer wall of the bottom of the main cylinder (4), a handle is fixedly connected to the outer wall of the bottom of the lower material plate (5), fixing rings are fixedly connected to both ends of the outer walls of the circumferences of the first material conveying cylinder (2) and the second material conveying cylinder (7), and a supporting column is fixedly connected to the outer walls of the bottoms of the fixing rings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121999081.2U CN215373269U (en) | 2021-08-24 | 2021-08-24 | Polyaluminium chloride drying device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202121999081.2U CN215373269U (en) | 2021-08-24 | 2021-08-24 | Polyaluminium chloride drying device |
Publications (1)
Publication Number | Publication Date |
---|---|
CN215373269U true CN215373269U (en) | 2021-12-31 |
Family
ID=79619219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202121999081.2U Expired - Fee Related CN215373269U (en) | 2021-08-24 | 2021-08-24 | Polyaluminium chloride drying device |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN215373269U (en) |
-
2021
- 2021-08-24 CN CN202121999081.2U patent/CN215373269U/en not_active Expired - Fee Related
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102183126B (en) | Rake type vacuum drying system | |
CN102168911B (en) | Rake vacuum drying main machine | |
CN215373269U (en) | Polyaluminium chloride drying device | |
CN204739866U (en) | Biax paddle desiccator | |
CN210733207U (en) | Material bridge-preventing mechanism for hopper of wet extrusion granulator | |
CN211329710U (en) | Crushing device of rotary flash drying machine | |
CN112871083A (en) | Pharmacy is with swaing formula granulation machine | |
CN107244788A (en) | A kind of device and its process, sludge treating system for sludge crushing | |
CN208771521U (en) | A kind of Flux Baker charging even distributor | |
CN208118493U (en) | A kind of construction waste pressurizing unit | |
CN208145909U (en) | A kind of NEW TYPE OF COMPOSITE fertilizer drum granulating equipment | |
CN210569550U (en) | Synthetic rubber extrusion dehydrator | |
CN210357404U (en) | Sericite production and processing equipment capable of being recycled | |
CN202329021U (en) | Rake type vacuum drying device | |
CN102252515B (en) | Material raising device for ramsbottom dryer | |
CN201964732U (en) | Rake type vacuum drying machine set | |
CN102699296B (en) | Automatic slag feeder for continuous casting crystallizer | |
CN216605388U (en) | Grinding device is used in production of flexible nanometer silver thick liquid | |
CN103464053A (en) | Horizontal type wedge plate extruding and granulating machine | |
CN215320483U (en) | Amino membrane plastic's granulator convenient to wash | |
CN219905760U (en) | Double-screw feeder with extrusion crushing function | |
CN217757233U (en) | Sludge drying device for sewage treatment | |
CN203484118U (en) | Horizontal wedge plate extrusion pelletizer | |
CN213687630U (en) | Pomace drying device used after juicing of roxburgh rose | |
CN212040331U (en) | Vertical granulator and active carbon processing equipment |
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: 20211231 |