CN109227949B - Cement paste stirring and mixing device - Google Patents
Cement paste stirring and mixing device Download PDFInfo
- Publication number
- CN109227949B CN109227949B CN201811150803.XA CN201811150803A CN109227949B CN 109227949 B CN109227949 B CN 109227949B CN 201811150803 A CN201811150803 A CN 201811150803A CN 109227949 B CN109227949 B CN 109227949B
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- China
- Prior art keywords
- peripheral side
- stirring barrel
- stirring
- fixedly connected
- frame
- 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
- 238000003756 stirring Methods 0.000 title claims abstract description 91
- 239000004568 cement Substances 0.000 title claims abstract description 48
- 230000002093 peripheral effect Effects 0.000 claims abstract description 34
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 8
- 239000011440 grout Substances 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 12
- 238000010276 construction Methods 0.000 abstract description 3
- 239000004575 stone Substances 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 210000003781 tooth socket Anatomy 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
- B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0806—Details; Accessories
- B28C5/0831—Drives or drive systems, e.g. toothed racks, winches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/0806—Details; Accessories
- B28C5/0856—Supporting frames or structures, e.g. supporting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
- B28C5/18—Mixing in containers to which motion is imparted to effect the mixing
- B28C5/20—Mixing in containers to which motion is imparted to effect the mixing rotating about a horizontal or substantially horizontal axis during mixing, e.g. without independent stirrers
- B28C5/2045—Parts or components
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
本发明公开了一种水泥浆搅拌混合装置，涉及建筑机械技术领域。本发明包括机架和搅拌桶，机架一表面螺栓连接有若干支撑环，支撑环内壁与搅拌桶周侧面转动连接，搅拌桶一端面贯穿有进料筒，进料筒周侧面与搅拌桶固定连接，进料筒周侧面与机架转动连接，搅拌桶周侧面转动连接有若干连接杆，连接杆位于搅拌桶内部一端固定连接有搅拌叶，连接杆位于搅拌桶外部一端固定连接有从动齿轮，支撑环一表面开设有轮齿槽。本发明通过进料筒、支撑环、齿轮和搅拌叶的设计，搅拌叶对搅拌桶内的水泥浆进行横向搅拌，避免了现有搅拌设备不能进行充分的搅拌水泥浆，以及体积较大的砂石混入水泥浆中影响水泥浆质量的问题。
The invention discloses a cement slurry stirring and mixing device, which relates to the technical field of construction machinery. The invention includes a frame and a mixing barrel. A surface of the frame is bolted with a plurality of support rings, the inner wall of the support ring is rotatably connected with the peripheral side of the mixing barrel, and one end surface of the mixing barrel is penetrated by a feeding barrel, and the peripheral side of the feeding barrel is fixed to the mixing barrel. Connection, the peripheral side of the feeding barrel is rotatably connected with the frame, and the peripheral side of the mixing barrel is rotatably connected with several connecting rods. , a surface of the support ring is provided with a gear tooth slot. The invention adopts the design of the feeding drum, the support ring, the gear and the stirring blade, and the stirring blade performs lateral stirring for the cement slurry in the mixing drum, so as to avoid the existing mixing equipment that cannot fully mix the cement slurry and the sand with a large volume. The problem that stone mixed into cement slurry affects the quality of cement slurry.
Description
Technical Field
The invention belongs to the technical field of construction machinery, and particularly relates to a cement paste stirring and mixing device.
Background
A cement mixer, also known as a concrete mixer, is a machine for mixing and stirring cement, gravel aggregate and water into a concrete mixture. The working principle of the device is that materials enter the device through a feed inlet, a stirring device rotates at a high speed to stir, so that the materials roll in an all-around continuous cycle and are quickly mixed, and finally the materials are discharged through a discharge outlet, so that two or more materials can be dispersed and fully contacted by stirring, and the uniformity of a density field, a concentration field and a temperature field is further achieved.
Due to the structural limitation of the existing stirring equipment, the stirring blades in the stirring cylinder have working blind areas in the stirring cylinder, so that cement paste cannot be stirred fully and uniformly, and the requirements of construction specifications cannot be met; in the cement paste mixing process, due to different sizes of the sand grains, the sand grains with larger volume are mixed into the cement paste, so that the uniformity and stability of the cement paste are reduced, and the use quality of the cement paste is influenced.
Disclosure of Invention
The invention aims to provide a cement paste stirring and mixing device, which solves the problems that the existing stirring equipment cannot fully stir cement paste and large-size sand stones are mixed into the cement paste to influence the quality of the cement paste through the design of a feeding cylinder, a supporting ring, a gear and a stirring blade.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a cement paste stirring and mixing device, which comprises a frame and a stirring barrel; three support rings are connected to one surface of the rack through bolts; the inner wall of the support ring is rotationally connected with the peripheral side surface of the stirring barrel; a feeding cylinder penetrates through one end face of the stirring barrel; the peripheral side surface of the feeding cylinder is fixedly connected with the stirring barrel; the peripheral side surface of the feeding cylinder is rotationally connected with the frame;
twelve connecting rods are rotatably connected to the circumferential side surface of the stirring barrel; one end of the connecting rod, which is positioned in the stirring barrel, is fixedly connected with a stirring blade; one end of the connecting rod, which is positioned outside the stirring barrel, is fixedly connected with a driven gear; a wheel tooth socket is formed in one surface of the support ring; the peripheral side surface of the driven gear is meshed with the gear tooth groove; the side surface of the connecting rod is fixedly connected with two limit rings; and a sealing ring is arranged between one surface of the limiting ring and the peripheral side surface of the stirring barrel.
Furthermore, a connecting plate is fixedly connected to one surface of the rack, and a motor is fixedly connected to one surface of the connecting plate; one end of the output shaft of the motor is fixedly connected with a driving gear; the peripheral side surface of the feeding cylinder positioned outside the stirring barrel is fixedly connected with a rotating gear; the peripheral side surface of the driving gear is meshed with the rotating gear.
Further, the feeding cylinder is of a hollow cylinder structure with two open ends; the circumferential side surface of the feeding cylinder, which is positioned inside the stirring barrel, is provided with a through hole.
Further, the stirring barrel is of a hollow cylinder structure; and the two end faces of the stirring barrel are rotatably connected with one surface of the frame.
Furthermore, four fixed supporting legs are fixedly connected to one surface of the rack; the four fixed supporting legs are respectively positioned at the corner positions of the machine frame.
Further, a discharge port is formed in the peripheral side face of the stirring barrel; and a sealing door is rotatably connected to one surface of the discharge hole.
Furthermore, a waste bin is connected to one surface of the rack through bolts; the waste bin is positioned below one end of the feeding cylinder; a spiral plate is fixedly connected to one surface of the waste bin; one end face of the spiral plate extends into the feeding cylinder; one surface of the spiral plate is rotationally connected with the inner wall of the feeding cylinder.
Further, the driven gear is of an umbrella-shaped structure in shape; twelve driven gears are uniformly distributed on the peripheral side surface of the stirring barrel; one surface of the driven gear is movably connected with the inner wall of the frame.
The invention has the following beneficial effects:
1. according to the invention, through the design of the support ring, the gear, the stirring barrel and the stirring blades, materials are continuously and circularly rolled and mixed in the rotation process of the stirring barrel, meanwhile, the driven gear and the support ring rotate, the driven gear drives the stirring blades in the stirring barrel to rotate through the connecting rod, and the stirring blades transversely stir cement paste, so that the cement paste is more fully and uniformly mixed, and the problem that the existing stirring equipment cannot fully stir the cement paste is solved.
2. According to the invention, through the design of the spiral plate and the through hole in the feeding cylinder, the feeding cylinder rotates to enable the spiral plate to push cement powder and gravel to move forwards, the cement powder and gravel in the feeding cylinder are premixed, meanwhile, the cement powder and the gravel with small volume fall into the stirring barrel through the through hole, the next stirring and mixing operation is carried out, the gravel with large volume is discharged to the waste bin from one end of the feeding cylinder, and the problems that the uniformity and stability of cement slurry are reduced and the quality of the cement slurry is influenced due to the fact that the gravel with large volume is mixed into the cement slurry are avoided.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a cement slurry mixing device;
FIG. 2 is a schematic diagram of the right view structure of FIG. 1;
FIG. 3 is a front view of the structure of FIG. 1;
FIG. 4 is a top view of the structure of FIG. 1;
FIG. 5 is a schematic view of the internal structure of the mixing tank;
FIG. 6 is a schematic view of the inner structure of the feed cylinder;
in the drawings, the components represented by the respective reference numerals are listed below:
1-frame, 2-stirring barrel, 101-support ring, 102-wheel tooth socket, 103-connecting plate, 104-motor, 105-driving gear, 106-fixed support leg, 107-waste bin, 108-spiral plate, 201-feeding barrel, 202-connecting rod, 203-stirring blade, 204-driven gear, 205-limiting ring, 206-sealing ring, 207-rotating gear, 208-through hole and 209-discharging port.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the present invention is a cement slurry stirring and mixing device, which comprises a frame 1 and a stirring barrel 2; three support rings 101 are connected to one surface of the frame 1 through bolts; the inner wall of the support ring 101 is rotationally connected with the peripheral side surface of the stirring barrel 2; a feeding cylinder 201 penetrates through one end face of the stirring barrel 2; the circumferential side surface of the feeding cylinder 201 is welded with the stirring barrel 2; the peripheral side surface of the feeding cylinder 201 is rotationally connected with the frame 1;
twelve connecting rods 202 are rotatably connected to the peripheral side surface of the stirring barrel 2; one end of the connecting rod 202 positioned in the stirring barrel 2 is fixedly connected with a stirring blade 203; one end of the connecting rod 202, which is positioned outside the stirring barrel 2, is fixedly connected with a driven gear 204; a wheel tooth socket 102 is arranged on one surface of the support ring 101; the peripheral side surface of the driven gear 204 is meshed with the gear tooth groove 102; two limit rings 205 are fixedly connected to the peripheral side surface of the connecting rod 202; the stop collar 205 prevents the connecting rod 202 from sliding; a sealing ring 206 is arranged between one surface of the limiting ring 205 and the peripheral side surface of the stirring barrel 2; the seal 206 prevents leakage of cement slurry.
Wherein, four fixed legs 106 are fixedly connected to one surface of the frame 1; the four fixed legs 106 are respectively located at the corner positions of the frame 1.
Wherein, the peripheral side surface of the stirring barrel 2 is provided with a discharge port 209; a sealing door is rotatably connected to one surface of the discharge port 209.
Wherein, the driven gear 204 is of an umbrella structure; the driven gear 204 is made to be more closely attached to the wheel tooth grooves 102 on the support ring 101; twelve driven gears 204 are uniformly distributed on the side surface of the 2-circumference of the stirring barrel; one surface of the driven gear 204 is movably connected with the inner wall of the frame 1; so that the frame 1 does not block the driven gear 204.
As shown in fig. 2, a surface of the frame 1 is fixedly connected with a connecting plate 103, and a surface of the connecting plate 103 is fixedly connected with a motor 104; one end of the output shaft of the motor 104 is fixedly connected with a driving gear 105; a rotary gear 207 is fixedly connected to the peripheral side surface of the feeding cylinder 201 positioned outside the stirring barrel 2; the peripheral side surface of the drive gear 105 is engaged with a rotary gear 207.
As shown in fig. 4 and 6, a waste bin 107 is bolted to one surface of the frame 1; the waste bin 107 is positioned below one end of the feed cylinder 201; a spiral plate 108 is fixedly connected to one surface of the waste bin 107; one end face of the spiral plate 108 extends to the interior of the feeding cylinder 201; one surface of the spiral plate 108 is rotationally connected with the inner wall of the feeding cylinder 201; the spiral plate 108 pushes the cement powder and the sand to move forwards; the waste bin 107 is adapted to receive a relatively large volume of sand.
As shown in fig. 5-6, the feeding cylinder 201 is a hollow cylinder structure with two open ends; a through hole 208 is formed in the peripheral side surface of the feeding cylinder 201 positioned in the stirring barrel 2; the cement powder and the sand fall into the stirring barrel 2 from the through hole 208; filtering out gravels with larger volume; the level of the cement slurry in the mixing drum 2 does not flood the lowest part of the feed cylinder 201.
As shown in fig. 4-5, the stirring barrel 2 is a hollow cylinder structure; two end faces of the stirring barrel 2 are rotatably connected with one surface of the frame 1.
The motor 104 is electrically connected to the controller and the power source through wires.
The working principle of the embodiment is as follows: when in use; the controller controls the motor 104 to rotate; the motor 104 drives the feeding cylinder 201 and the stirring barrel 2 to rotate sequentially through the driving gear 105 and the rotating gear 207; sand and cement powder are fed into the feeding cylinder 201 from the inlet of the feeding cylinder 201; the spiral plate 108 and the feeding cylinder 201 move relatively so as to push cement powder and sand to move forwards; premixing cement powder and sand in the feeding cylinder 201; meanwhile, the cement powder and the small-volume sand fall into the stirring barrel 2 through the through holes 208; the sand with larger volume is discharged to a waste bin 107 from the outlet of the feeding cylinder 201; large-volume gravels are prevented from being mixed into cement slurry; the mixing drum 2 drives the driven gear 204 to rotate around the feeding drum 201; simultaneously, the driven gear 204 and the support ring 101 rotate; rotating the driven gear 204 about the connecting rod 202; the driven gear 204 drives the stirring blade 203 to rotate through the connecting rod 202; the stirring blade 203 transversely stirs the cement slurry in the stirring barrel 2; the cement paste is mixed more fully and uniformly; discharging; a discharge port 209 on the stirring barrel 2 rotates to the lowest position and then a sealing door is opened; the cement slurry flows out of the discharge port 209.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. The utility model provides a grout stirring mixing arrangement which characterized in that:
comprises a frame (1) and a mixing tank (2); one surface of the frame (1) is connected with a plurality of support rings (101) through bolts; the inner wall of the support ring (101) is rotationally connected with the peripheral side surface of the stirring barrel (2); a feeding cylinder (201) penetrates through one end face of the stirring barrel (2); the peripheral side surface of the feeding cylinder (201) is fixedly connected with the stirring barrel (2); the peripheral side surface of the feeding cylinder (201) is rotationally connected with the frame (1);
the circumferential side surface of the stirring barrel (2) is rotationally connected with a plurality of connecting rods (202); one end of the connecting rod (202) positioned in the stirring barrel (2) is fixedly connected with a stirring blade (203); one end of the connecting rod (202) positioned outside the stirring barrel (2) is fixedly connected with a driven gear (204); one surface of the support ring (101) is provided with a wheel tooth groove (102); the peripheral side surface of the driven gear (204) is meshed with the gear tooth groove (102); the peripheral side surface of the connecting rod (202) is fixedly connected with a plurality of limiting rings (205); a sealing ring (206) is arranged between one surface of the limiting ring (205) and the peripheral side surface of the stirring barrel (2);
one surface of the rack (1) is fixedly connected with a connecting plate (103), and one surface of the connecting plate (103) is fixedly connected with a motor (104); one end of an output shaft of the motor (104) is fixedly connected with a driving gear (105); the peripheral side surface of the feeding cylinder (201) positioned outside the stirring barrel (2) is fixedly connected with a rotating gear (207); the peripheral side surface of the driving gear (105) is meshed with a rotating gear (207);
the feeding cylinder (201) is of a hollow cylindrical structure with two open ends; the peripheral side surface of the feeding cylinder (201) positioned in the stirring barrel (2) is provided with a through hole (208).
2. A cement slurry mixing and stirring device according to claim 1, wherein said stirring barrel (2) is of a hollow cylindrical structure; and two end faces of the stirring barrel (2) are rotatably connected with one surface of the frame (1).
3. A cement slurry mixing and stirring device according to claim 1, characterized in that a plurality of fixed legs (106) are fixedly connected to a surface of said frame (1); the fixed supporting legs (106) are respectively positioned at the corner positions of the frame (1).
4. The cement paste mixing and stirring device according to claim 1, wherein a discharge port (209) is formed on the peripheral side surface of the stirring barrel (2); one surface of the discharge hole (209) is rotatably connected with a sealing door.
5. A cement slurry mixing device according to claim 1, characterized in that said frame (1) has a waste bin (107) bolted to a surface thereof; the waste box (107) is positioned below one end of the feeding cylinder (201); a spiral plate (108) is fixedly connected to one surface of the waste box (107); one end face of the spiral plate (108) extends to the interior of the feeding cylinder (201); one surface of the spiral plate (108) is rotationally connected with the inner wall of the feeding cylinder (201).
6. A cement slurry mixing and stirring device according to claim 1, characterized in that said driven gear (204) is shaped as an umbrella; the driven gears (204) are uniformly distributed on the peripheral side surface of the stirring barrel (2); one surface of the driven gear (204) is movably connected with the inner wall of the frame (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811150803.XA CN109227949B (en) | 2018-09-29 | 2018-09-29 | Cement paste stirring and mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811150803.XA CN109227949B (en) | 2018-09-29 | 2018-09-29 | Cement paste stirring and mixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109227949A CN109227949A (en) | 2019-01-18 |
| CN109227949B true CN109227949B (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811150803.XA Expired - Fee Related CN109227949B (en) | 2018-09-29 | 2018-09-29 | Cement paste stirring and mixing device |
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| Country | Link |
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| CN (1) | CN109227949B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300653A (en) * | 2019-12-09 | 2020-06-19 | 郎溪县天鼎混凝土有限公司 | Concrete mixing production equipment |
| CN113172762A (en) * | 2021-04-26 | 2021-07-27 | 杨太材 | Cement mortar preparation process |
| CN114939932B (en) * | 2022-06-07 | 2024-03-15 | 徐州冠森新型墙材有限公司 | A kind of mortar anti-condensation transportation device |
| CN115026953B (en) * | 2022-07-18 | 2024-08-09 | 江西瑞道建设工程有限公司 | Concrete mixing device for concrete prefabricated member production and processing |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4188127A (en) * | 1978-11-06 | 1980-02-12 | London Concrete Machinery Co. | Mixing blades of concrete mixing drums |
| CN203678667U (en) * | 2013-12-24 | 2014-07-02 | 中国建筑第七工程局有限公司 | Novel sand screening machine |
| CN206501257U (en) * | 2017-02-25 | 2017-09-19 | 北京班诺混凝土有限公司 | Concrete agitating mechanism |
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2018
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| Publication number | Publication date |
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| CN109227949A (en) | 2019-01-18 |
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Granted publication date: 20210209 |