CN114111304A - Polyacrylamide drying device - Google Patents
Polyacrylamide drying device Download PDFInfo
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- CN114111304A CN114111304A CN202210108027.7A CN202210108027A CN114111304A CN 114111304 A CN114111304 A CN 114111304A CN 202210108027 A CN202210108027 A CN 202210108027A CN 114111304 A CN114111304 A CN 114111304A
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- Prior art keywords
- cylindrical working
- worm
- polyacrylamide
- rotating arm
- gear
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
- F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/003—Supply-air or gas filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/04—Agitating, stirring, or scraping devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a polyacrylamide drying device, which relates to the technical field of drying equipment. The invention has the beneficial effects that: this device supplies air through the forced draught blower and heats the air through the heat source, and the dust impurity in the air can be filtered effectively to the active carbon adsorption case, and the residue of cylindrical working barrel inner wall can be scraped to the rotation of scraper blade, and two rotations of worm wheel drive connecting rod rotate, and then control a worm seesaw, and then control the reciprocating motion around the auger is done for promote polyacrylamide around the auger, the better drying of polyacrylamide of being convenient for.
Description
Technical Field
The invention relates to the technical field of drying equipment, in particular to a polyacrylamide drying device.
Background
Polyacrylamide is a linear high molecular polymer, and is mainly divided into two forms of dry powder and colloid, the main chain of the polyacrylamide has a large amount of amide groups, the chemical activity is very high, and the polyacrylamide can be modified to prepare a plurality of polyacrylamide derivatives. The polyacrylamide is used as a lubricant, a suspending agent, a clay stabilizer, an oil displacement agent, a fluid loss agent and a thickening agent, is widely applied to well drilling, acidification, fracturing, water plugging, well cementation, secondary oil recovery and tertiary oil recovery, and is an extremely important oilfield chemical.
The final flow of the production of polyacrylamide is drying treatment, water in polyacrylamide needs to be removed, the polyacrylamide is kept dry, and the bagging and packaging treatment are convenient.
How to solve the technical problem is the technical problem faced by the present invention.
Disclosure of Invention
In order to achieve the above object, the present invention provides a polyacrylamide drying apparatus.
The technical scheme is that the device comprises a barrel body provided with an inner cavity, a cylindrical working barrel, a material conveying unit, a heating mechanism and an air supply mechanism, wherein the central line of the cylindrical working barrel is horizontal and is fixed in the inner cavity of the barrel body;
the upper part of the cylindrical working barrel is provided with a feeding hole, the lower part of the cylindrical working barrel is provided with a discharging hole, the feeding hole and the discharging hole respectively penetrate through the inner cavity of the barrel body and extend to the outside, the cylindrical working barrel is provided with a spacing cavity and a working cavity, and the material conveying unit comprises an auger and an adjusting mechanism, wherein the auger is positioned in the working cavity, the axis of the auger is arranged along the central line of the cylindrical working barrel, and the adjusting mechanism is arranged in the spacing cavity and controls the action of the auger;
the length of the working cavity is greater than that of the packing auger, the adjusting mechanism comprises a first worm which is coaxial with a rotating shaft of the packing auger, a first worm wheel which is rotatably connected in the cylindrical working barrel and is meshed with the first worm, a second worm which is parallel to the axis of the first worm and is rotatably connected in the cylindrical working barrel, a second worm wheel which is rotatably connected in the cylindrical working barrel and is meshed with the second worm, a first rotating arm which is coaxial with the first worm wheel and has one end, a second rotating arm which is coaxial with the second worm wheel and has one end, a connecting rod which is movably connected between the other end of the first rotating arm and the other end of the second rotating arm, and a gear and a second gear which are meshed with each other; the second worm is coaxial with the output shaft of the motor;
two ends of the connecting rod are respectively in rotating connection with the first rotating arm and the second rotating arm;
the rotating shaft of the gear is coaxial with the rotating shaft of the first worm, and the rotating shaft of the second gear is coaxial with the rotating shaft of the second worm.
The material conveying unit further comprises a scraping mechanism matched with the circumferential inner side wall of the cylindrical working barrel.
The scraping mechanism comprises a plurality of scraping plates which are uniformly arranged along the circumferential direction of the cylindrical working barrel and are attached to the circumferential inner side wall of the cylindrical working barrel, and two supporting pieces which are correspondingly positioned at two ends of the plurality of scraping plates; the supporting pieces are fixedly connected with the corresponding end parts of the plurality of the scraping plates respectively.
The support piece is fixedly connected with the packing auger.
The supporting piece is rotatably connected with the cylindrical working barrel.
The heating mechanism comprises a pipeline spirally wound on the cylindrical working barrel, the pipeline comprises an annular water pipe, a heating wire and a first heat source, the heating wire is connected with the inner wall of the annular water pipe in an inserting mode, the first heat source is electrically connected with the heating wire, the pipeline is far away from the first heat source and is provided with a sealing plate, and the tail end of the heating wire is attached to the sealing plate.
Cylindrical working barrel one end is provided with the intake stack, the cylindrical working barrel other end is provided with out the tuber pipe way, air supply mechanism include with the forced draught blower that the intake stack is linked together sets up the forced draught blower with heat source between the intake stack, and set up the forced draught blower with active carbon adsorption tank between the heat source.
The length of the first rotating arm is larger than that of the second rotating arm.
The technical scheme provided by the embodiment of the invention has the following beneficial effects: the device supplies air through the air feeder and heats the air through the heat source, the activated carbon adsorption box can effectively filter dust impurities in the air, meanwhile, the spiral winding pipeline of the cylindrical working barrel can enable the working cavity of the cylindrical working barrel to be heated uniformly, the pair of heating wires of the heat source is used for heating the annular water pipe, the drying rate of polyacrylamide can be further accelerated, the residue on the inner wall of the cylindrical working barrel can be scraped through the rotation of the scraping plate, the motor drives the worm II to rotate and further drives the gear II to rotate, the gear II is meshed with the gear to control the worm I to rotate, the worm I rotates and further drives the auger to rotate, meanwhile, the worm I and the worm gear II are rotationally connected through the connecting rod, the connecting rod is driven to rotate through the rotation of the worm II, the back and forth movement of the worm I is further controlled, the auger is controlled to do back and forth reciprocating movement, so that the auger pushes the polyacrylamide forwards and backwards, facilitating better drying of the polyacrylamide.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Fig. 2 is a partial structural diagram of an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a cylindrical mandrel according to an embodiment of the present invention.
FIG. 4 is a schematic structural diagram of the packing auger according to the embodiment of the invention.
FIG. 5 is a schematic cross-sectional view of an annular water pipe according to an embodiment of the present invention.
Fig. 6 is an enlarged schematic view a of fig. 1.
Wherein the reference numerals are: 1. a barrel; 101. a motor; 102. a fixing plate; 103. supporting legs; 2. a cylindrical working barrel; 201. a support member; 202. a squeegee; 203. an air inlet pipeline; 204. an air outlet pipeline; 301. a feed inlet; 302. a discharge port; 4. a pipeline; 401. an annular water pipe; 402. an electric heating wire; 5. a blower; 501. an activated carbon adsorption tank; 502. a heat source; 503. a first heat source; 6. a packing auger; 701. a first worm wheel; 702. a second worm gear; 801. a first worm; 802. a second worm; 901. a gear; 902. a second gear; 1001. a first rotating arm; 1002. a second rotating arm; 11. a connecting rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described herein are merely illustrative of the invention and are not intended to be limiting.
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1
Referring to fig. 1 to 6, the invention provides a polyacrylamide drying device, which comprises a cylinder body 1 provided with an inner cavity, a cylindrical working cylinder 2, a material conveying unit, a heating mechanism and an air supply mechanism, wherein the central line of the cylindrical working cylinder 2 is horizontal and is fixed in the inner cavity of the cylinder body 1, the material conveying unit is arranged on the cylinder body 1 and is matched with the cylindrical working cylinder 2, the heating mechanism is arranged between the cylinder body 1 and the cylindrical working cylinder 2, and the air supply mechanism is arranged to penetrate through the cylindrical working cylinder 2;
the upper part of the cylindrical working barrel 2 is provided with a feeding hole 301, the lower part of the cylindrical working barrel 2 is provided with a discharging hole 302, the feeding hole 301 and the discharging hole 302 respectively penetrate through the inner cavity of the barrel body 1 and extend to the outside, the cylindrical working barrel 2 is provided with a spacing cavity and a working cavity, the material conveying unit comprises an auger 6 which is positioned in the working cavity and is provided with an axis along the central line of the cylindrical working barrel 2, and an adjusting mechanism which is arranged in the spacing cavity and controls the action of the auger 6;
the length of the working cavity is greater than that of the packing auger 6, the adjusting mechanism comprises a first worm 801 coaxial with a rotating shaft of the packing auger 6, a first worm wheel 701 rotatably connected in the cylindrical working barrel 2 and meshed with the first worm 801, a second worm 802 rotatably connected in the cylindrical working barrel 2 and having an axis parallel to that of the first worm 801, a second worm wheel 702 rotatably connected in the cylindrical working barrel 2 and meshed with the second worm 802, a first rotating arm 1001 with one end coaxial with the first worm wheel 701, a second rotating arm 1002 with one end coaxial with the second worm wheel 702, a connecting rod 11 movably connected between the other end of the first rotating arm 1001 and the other end of the second rotating arm 1002, and a gear 901 and a gear 902 which are meshed with each other; the second worm 802 is coaxial with the output shaft of the motor 101;
two ends of the connecting rod 11 are respectively connected with the first rotating arm 1001 and the second rotating arm 1002 in a rotating mode;
the rotating shaft of the gear 901 is coaxial with the rotating shaft of the first worm 801, and the rotating shaft of the second gear 902 is coaxial with the rotating shaft of the second worm 802.
The material conveying unit also comprises a scraping mechanism matched with the circumferential inner side wall of the cylindrical working barrel 2.
The scraping mechanism comprises a plurality of scraping plates 202 which are uniformly arranged along the circumferential direction of the cylindrical working barrel 2 and are attached to the circumferential inner side wall of the cylindrical working barrel 2, and two supporting pieces 201 which are correspondingly positioned at two ends of the plurality of scraping plates 202; the supporting members 201 are fixedly connected with corresponding ends of the scrapers 202.
The support member 201 is fixedly connected with the packing auger 6.
The support 201 is rotatably connected to the cylindrical mandrel 2.
The heating mechanism comprises a pipeline 4 spirally wound on the cylindrical working barrel 2, the pipeline 4 comprises an annular water pipe 401, a heating wire 402 inserted into the inner wall of the annular water pipe 401, and a first heat source 503 electrically connected with the heating wire 402, the pipeline 4 is far away from the first heat source 503 and is provided with a sealing plate, and the tail end of the heating wire 402 is attached to the sealing plate.
An air inlet pipeline 203 is arranged at one end of the cylindrical working barrel 2, an air outlet pipeline 204 is arranged at the other end of the cylindrical working barrel 2, and the air supply mechanism comprises a blower 5 communicated with the air inlet pipeline 203, a heat source 502 arranged between the blower 5 and the air inlet pipeline 203, and an activated carbon adsorption box 501 arranged between the blower 5 and the heat source 502.
The length of the first rotating arm 1001 is greater than that of the second rotating arm 1002. The side wall of the cylinder 1 is provided with a fixing plate 102, and the fixing plate 102 and the bottom of the cylinder 1 are provided with support legs 103 which are linearly arranged. The blower 5, the activated carbon adsorption tank 501, the heat source 502, and the first heat source 503 are all fixed to the fixing plate 102.
When the device is used, polyacrylamide enters a working cavity of a cylindrical working barrel 2 along a feeding hole 301, a blower 5 and a heat source 502 are started to heat air, the air sequentially enters the working cavity of the cylindrical working barrel 2 through an activated carbon adsorption box 501 and the heat source 502 to heat the working cavity of the cylindrical working barrel 2, a first heat source 503 heats an electric heating wire 402 to heat an annular water pipe 401, the annular water pipe 401 is spirally wound on the cylindrical working barrel 2 to ensure that the working cavity of the cylindrical working barrel 2 is uniformly heated, an air outlet pipeline 204 is convenient for removing moisture, residue on the inner wall of the cylindrical working barrel 2 can be scraped by the rotation of a scraping plate 202, a second worm 802 is driven by a motor 101 to rotate to drive a second gear 902 to rotate, the second gear 902 is meshed with a gear 901 to control the first worm 801 to rotate, the first worm 801 to rotate to drive a packing auger to rotate, meanwhile, the first worm wheel 701 and the second worm wheel 702 are rotatably connected through the connecting rod 11, the second worm wheel 702 rotates to drive the connecting rod 1 to rotate, the first worm 801 is controlled to move back and forth, the packing auger 6 is controlled to do back and forth reciprocating motion, the packing auger 6 pushes polyacrylamide back and forth, the polyacrylamide can be effectively prevented from being heated to form lumps, and the adhered polyacrylamide can be effectively treated.
Facilitating better drying of the polyacrylamide.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The polyacrylamide drying device is characterized by comprising a cylinder body (1) provided with an inner cavity, a cylindrical working cylinder (2) of which the central line is horizontal and fixed in the inner cavity of the cylinder body (1), a material conveying unit arranged on the cylinder body (1) and matched with the cylindrical working cylinder (2), a heating mechanism arranged between the cylinder body (1) and the cylindrical working cylinder (2), and an air supply mechanism arranged to penetrate through the cylindrical working cylinder (2);
the feeding device is characterized in that a feeding hole (301) is formed in the upper part of the cylindrical working barrel (2), a discharging hole (302) is formed in the lower part of the cylindrical working barrel (2), the feeding hole (301) and the discharging hole (302) respectively penetrate through the inner cavity of the barrel body (1) and extend to the outer side, a spacing cavity and a working cavity are formed in the cylindrical working barrel (2), the material conveying unit comprises a packing auger (6) which is located in the working cavity and is arranged with an axis along the central line of the cylindrical working barrel (2), and an adjusting mechanism which is arranged in the spacing cavity and controls the packing auger (6) to move;
the length of the working cavity is greater than that of the packing auger (6), the adjusting mechanism comprises a first worm (801) coaxial with a rotating shaft of the packing auger (6), a first worm wheel (701) rotatably connected in the cylindrical working barrel (2) and meshed with the first worm (801), and the axis of the first worm wheel is parallel to that of the first worm (801), the worm gear II is rotatably connected in the cylindrical working barrel (2), the worm gear II (702) is rotatably connected in the cylindrical working barrel (2) and meshed with the worm gear II (802), the rotating arm I (1001) with one end coaxial with the worm gear I (701), the rotating arm II (1002) with one end coaxial with the worm gear II (702), the connecting rod (11) is movably connected between the other end of the rotating arm I (1001) and the other end of the rotating arm II (1002), and the gear (901) and the gear II (902) are meshed with each other; the second worm (802) is coaxial with the output shaft of the motor (101);
two ends of the connecting rod (11) are respectively in rotating connection with the first rotating arm (1001) and the second rotating arm (1002);
the rotating shaft of the gear (901) is coaxial with the rotating shaft of the first worm (801), and the rotating shaft of the gear II (902) is coaxial with the rotating shaft of the second worm (802).
2. The drying device for polyacrylamide as defined in claim 1, wherein said material conveying unit further comprises a scraping mechanism cooperating with the circumferential inner side wall of said cylindrical working cylinder (2).
3. The polyacrylamide drying device according to claim 2, wherein the scraping mechanism comprises a plurality of scrapers (202) which are uniformly arranged along the circumference of the cylindrical working cylinder (2) and are attached to the inner side wall of the circumference of the cylindrical working cylinder (2), and two support members (201) which are correspondingly positioned at two ends of the plurality of scrapers (202); the supporting pieces (201) are fixedly connected with the corresponding end parts of the plurality of scraping plates (202) respectively.
4. The polyacrylamide drying device according to claim 3, wherein the support member (201) is fixedly connected with the packing auger (6).
5. A polyacrylamide drying apparatus according to claim 3, characterized in that said supporting member (201) is rotatably connected with said cylindrical mandrel (2).
6. The polyacrylamide drying device according to claim 3, wherein the heating mechanism comprises a pipeline (4) spirally wound on the cylindrical working barrel (2), the pipeline (4) comprises an annular water pipe (401), a heating wire (402) inserted into the inner wall of the annular water pipe (401), and a first heat source (503) electrically connected with the heating wire (402), the pipeline (4) is provided with a sealing plate far away from the first heat source (503), and the tail end of the heating wire (402) is attached to the sealing plate.
7. The polyacrylamide drying device according to claim 2, wherein an air inlet pipe (203) is arranged at one end of the cylindrical working cylinder (2), an air outlet pipe (204) is arranged at the other end of the cylindrical working cylinder (2), the air supply mechanism comprises an air supply blower (5) communicated with the air inlet pipe (203), a heat source (502) arranged between the air supply blower (5) and the air inlet pipe (203), and an activated carbon adsorption tank (501) arranged between the air supply blower (5) and the heat source (502).
8. The drying apparatus for polyacrylamide as defined in claim 1, wherein the length of the first rotating arm (1001) is longer than the length of the second rotating arm (1002).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108027.7A CN114111304A (en) | 2022-01-28 | 2022-01-28 | Polyacrylamide drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210108027.7A CN114111304A (en) | 2022-01-28 | 2022-01-28 | Polyacrylamide drying device |
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| Publication Number | Publication Date |
|---|---|
| CN114111304A true CN114111304A (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210108027.7A Pending CN114111304A (en) | 2022-01-28 | 2022-01-28 | Polyacrylamide drying device |
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| CN (1) | CN114111304A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130167394A1 (en) * | 2010-02-05 | 2013-07-04 | Guangzhou Pude Environmental Protection Equipment | Devices for Air-drying Sludge |
| CN206739794U (en) * | 2017-03-14 | 2017-12-12 | 天津涌基源农业科技有限公司 | Organic fertilizer conveys drying equipment |
| CN210080228U (en) * | 2019-05-27 | 2020-02-18 | 重庆市潼南区顺圆食品经营部 | Chinese-medicinal material belt cleaning device |
| CN212133225U (en) * | 2020-04-29 | 2020-12-11 | 罗山县中原聚合物有限公司 | Polyacrylamide dryer |
| CN213968034U (en) * | 2020-11-05 | 2021-08-17 | 湖南军粮红旗米业有限责任公司 | Belt cleaning device for rice with stoving mechanism |
| CN215638558U (en) * | 2021-09-18 | 2022-01-25 | 内蒙古化工职业学院 | Drying equipment of catalyst production usefulness |
-
2022
- 2022-01-28 CN CN202210108027.7A patent/CN114111304A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130167394A1 (en) * | 2010-02-05 | 2013-07-04 | Guangzhou Pude Environmental Protection Equipment | Devices for Air-drying Sludge |
| CN206739794U (en) * | 2017-03-14 | 2017-12-12 | 天津涌基源农业科技有限公司 | Organic fertilizer conveys drying equipment |
| CN210080228U (en) * | 2019-05-27 | 2020-02-18 | 重庆市潼南区顺圆食品经营部 | Chinese-medicinal material belt cleaning device |
| CN212133225U (en) * | 2020-04-29 | 2020-12-11 | 罗山县中原聚合物有限公司 | Polyacrylamide dryer |
| CN213968034U (en) * | 2020-11-05 | 2021-08-17 | 湖南军粮红旗米业有限责任公司 | Belt cleaning device for rice with stoving mechanism |
| CN215638558U (en) * | 2021-09-18 | 2022-01-25 | 内蒙古化工职业学院 | Drying equipment of catalyst production usefulness |
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Application publication date: 20220301 |