CN112361627A - Deep geothermal energy collection system and supplementary bearing structure thereof - Google Patents
Deep geothermal energy collection system and supplementary bearing structure thereof Download PDFInfo
- Publication number
- CN112361627A CN112361627A CN202011258156.1A CN202011258156A CN112361627A CN 112361627 A CN112361627 A CN 112361627A CN 202011258156 A CN202011258156 A CN 202011258156A CN 112361627 A CN112361627 A CN 112361627A
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- CN
- China
- Prior art keywords
- connecting plate
- far away
- motor
- fixedly connected
- supporting structure
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- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T2010/50—Component parts, details or accessories
- F24T2010/53—Methods for installation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention discloses a deep geothermal energy collecting device and an auxiliary supporting structure thereof, which comprises a collecting device and a supporting structure main body, wherein the collecting device and the supporting structure main body comprise a motor, a channel pipe and a bolt, an adjusting mechanism is arranged at the lower side of the motor, a first connecting plate is fixedly connected at the lower side of the motor, a second connecting plate is fixedly connected at one side of the first connecting plate, which is far away from the motor, one end of the second connecting plate, which is far away from the first connecting plate, is inserted into a second open groove, the outer side of the second open groove is arranged in a third connecting plate, first meshing teeth are arranged at the outer sides of the second connecting plate, second meshing teeth are meshed at one side of the first meshing teeth, which is far away from the second connecting plate, one side of the second meshing teeth, which is far away from the first meshing teeth, is fixedly connected on the third connecting plate, so that when the motor needs to be adjusted according to the, the installation convenience of the motor is improved.
Description
Technical Field
The invention relates to an acquisition device and a supporting structure, in particular to a deep geothermal energy acquisition device and an auxiliary supporting structure thereof, and belongs to the technical field of acquisition devices and supporting structures.
Background
With the progress of science and technology, the society is continuously developed, various energy sources are continuously used and developed, the traditional energy sources usually adopt petroleum or raw coal and the like, the energy sources belong to nonrenewable resources, the more the energy sources are used, the less the energy sources are used, the environment can be damaged when the energy sources are used, and the environment where people live is damaged, therefore, people continuously search new energy sources to replace the new energy sources, at present, the new energy sources such as hydraulic power generation, wind power generation, geothermal energy generation and the like are continuously used to bring great convenience to the life of people, the energy sources also belong to renewable resources, the geothermal energy is used by extracting energy earth surface deeply buried in the ground in a way of being converted into kinetic energy, and the geothermal energy collecting device is usually constructed in the field and needs to be supported and fixed by using a supporting device, however, the general supporting structure adopts a fixed supporting base, and the height of the general supporting structure cannot be adjusted according to the actual installation condition, so that the acquisition device is inconvenient to install.
Disclosure of Invention
The invention aims to provide a deep geothermal energy collecting device and an auxiliary supporting structure thereof, and aims to solve the problems that the conventional supporting structure cannot be adjusted and a collecting device is inconvenient to mount in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: comprises a collecting device and a supporting structure body, wherein the collecting device and the supporting structure body comprise a motor, a channel pipe and a bolt, an adjusting mechanism is arranged at the lower side of the motor, a first connecting plate is fixedly connected at the lower side of the motor, a second connecting plate is fixedly connected at one side of the first connecting plate far away from the motor, one end of the second connecting plate far away from the first connecting plate is inserted into a second groove, the outer side of the second groove is arranged in a third connecting plate, first engaging teeth are arranged at the outer side of the second connecting plate, second engaging teeth are engaged at one side of the first engaging teeth far away from the second connecting plate, one side of the second engaging teeth far away from the first engaging teeth is fixedly connected on the third connecting plate, the outer side of the third connecting plate is arranged in the third groove, the outer side of the third groove is arranged in a shell, a first direction-changing tooth is fixedly connected at the outer side of the third connecting plate, a second direction-changing tooth is engaged at, and one side that the third connecting plate was kept away from to the second diversion tooth has linked firmly the head rod, one side switching that the second diversion tooth was kept away from to the head rod is on the shell, and the meshing of first diversion tooth right-hand member upside has the third diversion tooth, one side that the third connecting plate was kept away from to the third diversion tooth has linked firmly the second connecting rod, and one side that the third diversion tooth was kept away from to the second connecting rod has linked firmly the rocking arm, one side switching that the second connecting rod was kept away from to the rocking arm has the crank, and the shell is inside has all seted up the fourth fluting, and the inside inserting of fourth fluting is equipped with the fourth connecting plate, one side that the shell was kept away from to the fourth connecting plate has linked firmly the fifth connecting plate, and one side that the fourth connecting plate was kept away from.
As a preferred technical scheme of the invention, a channel pipe is arranged on the left side of the motor through a bolt, an auxiliary mounting mechanism is arranged on the left side of the motor, a pin plate is fixedly connected to the left side of the motor, one end, far away from the motor, of the pin plate is inserted into a first open groove, the outer side of the first open groove is arranged in the channel pipe, a seventh open groove is formed in the pin plate, a pin block is inserted into the seventh open groove, and one side, far away from the pin plate, of the pin block is fixedly connected to the channel pipe.
As a preferable technical scheme of the invention, a first cushion pad is arranged in the second slot, and one side of the first cushion pad, which is far away from the second connecting plate, is fixedly connected to the third connecting plate.
As a preferable technical scheme of the invention, one end of the crank, which is far away from the rocker arm, is inserted into the fifth open slot, and the outer side of the fifth open slot is arranged in the rubber sleeve.
As a preferable technical scheme of the present invention, second buffer pads are disposed inside the fourth slots, and one sides of the second buffer pads far away from the fourth connecting plate are fixedly connected to the housing.
As a preferred technical scheme, the rotating wheel is attached to the outer side of the second connecting rod, one end, far away from the second connecting rod, of the rotating wheel is connected into the sixth open groove in a rotating mode, the outer side of the sixth open groove is formed in the sixth connecting plate, and one side, far away from the rotating wheel, of the sixth connecting plate is fixedly connected to the shell.
As a preferable technical scheme of the present invention, a third buffer pad is disposed inside the seventh slot, and one side of the third buffer pad, which is far away from the latch block, is fixedly connected to the latch plate.
As a preferred technical scheme of the invention, the first open slot is internally provided with a limiting block, and one side of the limiting block, which is far away from the bolt plate, is fixedly connected to the channel pipe.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a deep geothermal energy collecting device and an auxiliary supporting structure thereof, wherein the deep geothermal energy collecting device comprises a first connecting plate, a second connecting plate, a third connecting plate, a shell, a first buffer pad, a first steering gear, a second steering gear, a first connecting rod, a third steering gear, a second connecting rod, a rocker arm, a crank handle, a rubber sleeve, a fourth connecting plate, a fifth connecting plate, a second buffer pad, a rotating wheel and a sixth connecting plate, when a motor needs to be adjusted, the rubber sleeve is held to rotate, the crank handle and the rocker arm are driven to rotate under the limitation of the second connecting rod, meanwhile, the second connecting rod drives the third steering gear under the auxiliary rotation of the rotating wheel, the third steering gear is meshed with the first steering gear to drive the second steering gear and the first connecting rod on the left side, the third connecting plate is driven to rotate by the rotation of the first steering gear, the third connecting plate is meshed with the first meshing gear through the second meshing gear, the second connecting plate is enabled to move up and down to drive the first connecting plate to adjust the motor, when the first connecting plate is adjusted up and down, the fourth connecting plate is enabled to slide in the fourth groove through the fourth connecting plate and the fifth connecting plate on the two sides, and the first connecting plate is limited in ascending or descending, so that the problem that the height of the motor cannot be adjusted is solved, when the motor needs to be adjusted according to the actual installation height, the motor is adjusted to a certain height through the adjusting mechanism, and the installation convenience of the motor is improved;
2. according to the deep geothermal energy collecting device and the auxiliary supporting structure thereof, the pin plate, the pin block, the third buffer cushion and the limiting block are arranged, when a motor and a channel pipe are installed, the pin plate is inserted into the first open groove, the pin block is synchronously inserted into the seventh open groove, when the pin block is attached to the third buffer cushion, the pin plate is attached to the limiting block, and then the pin plate and the limiting block are installed and fixed through bolts, so that the problem that the installation of the motor and the channel pipe is not changed is solved, the installation of the motor and the channel pipe is simpler and more convenient, the installation time is saved, and the installation efficiency is improved.
Drawings
FIG. 1 is a schematic sectional elevation view of the structure of the present invention;
FIG. 2 is a schematic front view of the structure of the present invention;
FIG. 3 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
FIG. 4 is an enlarged view of the structure at B in FIG. 1 according to the present invention;
FIG. 5 is an enlarged view of the structure at C of FIG. 1 according to the present invention;
fig. 6 is an enlarged view of the structure at D in fig. 1 according to the present invention.
In the figure: 100. a collection device and a support structure body; 110. a motor; 120. a passage tube; 121. a first slot; 130. a bolt; 200. an adjustment mechanism; 210. a first connecting plate; 220. a second connecting plate; 221. a first meshing tooth; 230. a third connecting plate; 231. a second slot; 232. a second meshing tooth; 240. a housing; 241. a third slot is formed; 242. a fourth slot is formed; 250. a first cushion pad; 260. a first direction changing tooth; 270. a second direction changing tooth; 280. a first connecting rod; 290. a third direction-changing tooth; 2010. a second connecting rod; 2020. a rocker arm; 2030. a crank; 2040. a rubber sleeve; 2041. fifthly, slotting; 2050. a fourth connecting plate; 2060. a fifth connecting plate; 2070. a second cushion pad; 2080. a rotating wheel; 2090. a sixth connecting plate; 2091. a sixth groove is formed; 300. an auxiliary mounting mechanism; 310. a latch plate; 311. a seventh slot; 320. a latch block; 330. a third cushion pad; 340. and a limiting block.
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 provides a deep geothermal energy collecting device and an auxiliary supporting structure thereof, wherein the deep geothermal energy collecting device comprises:
referring to fig. 1-6, the collecting device and supporting structure body 100 comprises a motor 110, a channel tube 120 and a bolt 130, an adjusting mechanism 200 is disposed on the lower side of the motor 110, a first connecting plate 210 is fixedly connected to the lower side of the motor 110, a second connecting plate 220 is fixedly connected to one side of the first connecting plate 210 away from the motor 110, one end of the second connecting plate 220 away from the first connecting plate 210 is inserted into a second slot 231, the outer side of the second slot 231 is opened in a third connecting plate 230, first engaging teeth 221 are disposed on the outer sides of the second connecting plate 220, one side of the first engaging teeth 221 away from the second connecting plate 220 is engaged with second engaging teeth 232, the side of the second engaging teeth 232 away from the first engaging teeth 221 is fixedly connected to the third connecting plate 230, the outer side of the third connecting plate 230 is disposed in the third slot 241, the outer side of the third slot 241 is opened in a housing 240, a first direction-changing tooth 260 is fixedly connected to the outer side of the third connecting plate 230, a second direction-changing tooth 270 is engaged with the upper side of the left end of the first direction-changing tooth 260, a first connecting rod 280 is fixedly connected to the side of the second direction-changing tooth 270 away from the third connecting plate 230, the side of the first connecting rod 280 away from the second direction-changing tooth 270 is connected to the shell 240, a third direction-changing tooth 290 is engaged with the upper side of the right end of the first direction-changing tooth 260, a second connecting rod 2010 is fixedly connected to the side of the third direction-changing tooth 290 away from the third connecting plate 230, a rocker arm 2020 is fixedly connected to the side of the second connecting rod 2010 away from the third direction-changing tooth 290, a crank 2030 is rotatably connected to the side of the rocker arm 2020 away from the second connecting rod 2010, a fourth slot 242 is formed in the shell 240, a fourth connecting plate 2050 is inserted in the fourth slot 242, a fifth connecting plate 2060 is fixedly connected to the side of the fifth connecting plate 2060 away from the fourth connecting plate 210, the inside first blotter 250 that is provided with of second fluting 231, and one side that second connecting plate 220 was kept away from to first blotter 250 links firmly on third connecting plate 230, the one end that rocking arm 2020 was kept away from to crank 2030 is inserted and is established in fifth fluting 2041, and the outside of fifth fluting 2041 is seted up in rubber sleeve 2040, the inside second blotter 2070 that all is provided with of fourth fluting 242, and one side that fourth connecting plate 2050 was kept away from to second blotter 2070 all links firmly on shell 240, the laminating of the second connecting rod 2010 outside has runner 2080, and the one end of runner 2081 keeping away from second connecting rod 2010 connects in sixth fluting 2091, the outside of sixth fluting 2091 is seted up in sixth connecting plate 2090, and one side that runner 2080 was kept away from to sixth connecting plate 2090 all links firmly on shell 240.
According to fig. 1 and 6, the channel tube 120 is disposed on the left side of the motor 110 through the bolt 130, the auxiliary mounting mechanism 300 is disposed on the left side of the motor 110, the left side of the motor 110 is fixedly connected to the latch plate 310, one end of the latch plate 310, which is far away from the motor 110, is inserted into the first slot 121, the outer side of the first slot 121 is disposed in the channel tube 120, the latch plate 310 is internally provided with a seventh slot 311, the latch block 320 is inserted into the seventh slot 311, one side of the latch block 320, which is far away from the latch plate 310, is fixedly connected to the channel tube 120, the seventh slot 311 is internally provided with a third buffer 330, one side of the third buffer 330, which is far away from the latch block 320, is fixedly connected to the latch plate 310, the first slot 121 is internally provided with a limit block 340, and one side of the limit block 340, which is.
When the deep geothermal energy collecting device and the auxiliary supporting structure thereof are used specifically, when the motor 110 needs to be adjusted, the rubber sleeve 2040 is held to rotate, the crank 2030 and the rocker 2020 are driven to rotate under the limitation of the second connecting rod 2010, meanwhile, the second connecting rod 2010 drives the third deflecting tooth 290 under the auxiliary rotation of the turning wheel 2080, the third deflecting tooth 290 is meshed with the first deflecting tooth 260, the second deflecting tooth 270 and the first connecting rod 280 on the left side are driven, the third connecting plate 230 is driven to rotate by the rotation of the first deflecting tooth 260, the third connecting plate 230 is driven to move up and down by the meshing of the second engaging tooth 232 and the first engaging tooth 221, the first connecting plate 210 is driven to adjust the motor 110, when the first connecting plate 210 is adjusted up and down, the fourth connecting plate 2050 and the fifth connecting plate 2060 on both sides slide in the fourth groove 242, the first connection plate 210 is limited in ascending or descending, when the motor 110 and the channel tube 120 are installed, the latch plate 310 is inserted into the first slot 121, the latch block 320 is synchronously inserted into the seventh slot 311, and when the latch block 320 is attached to the third buffer pad 330, the latch plate 310 is attached to the limit block 340 and then installed and fixed through the bolt 130.
In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, for example, it may be fixedly attached, detachably attached, or integrated; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A deep geothermal energy collecting device and an auxiliary supporting structure thereof comprise a collecting device and a supporting structure main body (100), wherein the collecting device and the supporting structure main body (100) comprise a motor (110), a channel pipe (120) and a bolt (130), and an adjusting mechanism (200) is arranged on the lower side of the motor (110), the deep geothermal energy collecting device is characterized in that a first connecting plate (210) is fixedly connected to the lower side of the motor (110), a second connecting plate (220) is fixedly connected to one side, far away from the motor (110), of the first connecting plate (210) of the second connecting plate (220), one end, far away from the first connecting plate (210), of the second connecting plate is inserted into a second slot (231), the outer side of the second slot (231) is arranged in a third connecting plate (230), first engaging teeth (221) are arranged on the outer side of the second connecting plate (220), and second engaging teeth (232) are engaged with one side, far away from the second connecting plate (220), of the first engaging teeth, one side of the second meshing tooth (232) far away from the first meshing tooth (221) is fixedly connected to a third connecting plate (230), the outer side of the third connecting plate (230) is arranged in a third groove (241), the outer side of the third groove (241) is arranged in a shell (240), the outer side of the third connecting plate (230) is fixedly connected with a first direction-changing tooth (260), the upper side of the left end of the first direction-changing tooth (260) is meshed with a second direction-changing tooth (270), one side of the second direction-changing tooth (270) far away from the third connecting plate (230) is fixedly connected with a first connecting rod (280), one side of the first connecting rod (280) far away from the second direction-changing tooth (270) is connected to the shell (240), the upper side of the right end of the first direction-changing tooth (260) is meshed with a third direction-changing tooth (290), one side of the third direction-changing tooth (290) far away from the third connecting plate (230) is fixedly connected with a second connecting rod (2010), and one side of the second connecting rod (2010) far away from the third direction-changing tooth (, rocking arm (2020) keep away from one side switching of second connecting rod (2010) has crank (2030), and shell (240) inside has all been seted up fourth fluting (242), and fourth fluting (242) inside is inserted and is equipped with fourth connecting plate (2050), one side that shell (240) were kept away from in fourth connecting plate (2050) has linked firmly fifth connecting plate (2060), and one side that fourth connecting plate (2050) were kept away from in fifth connecting plate (2060) links firmly on first connecting plate (210).
2. A deep geothermal energy harvesting device according to claim 1, wherein: the utility model discloses a motor, including motor (110), bolt (130), supplementary installation mechanism (300), bolt (310) and bolt board (310), the motor (110) left side is provided with passageway pipe (120) through bolt (130), and motor (110) left side is provided with supplementary installation mechanism (300), motor (110) left side has linked firmly bolt board (310), and bolt board (310) keep away from the one end of motor (110) and insert and establish in first fluting (121), set up in passageway pipe (120) in the first fluting (121) outside, and bolt board (310) is inside has seted up seventh fluting (311), seventh fluting (311) is inside to be inserted and is equipped with cotter piece (320), and one side that bolt board (310) was kept away from to cotter piece (320) links.
3. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 1, wherein: a first buffer pad (250) is arranged in the second slot (231), and one side, far away from the second connecting plate (220), of the first buffer pad (250) is fixedly connected to the third connecting plate (230).
4. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 1, wherein: one end, far away from the rocker arm (2020), of the crank handle (2030) is inserted into the fifth groove (2041), and the outer side of the fifth groove (2041) is arranged in the rubber sleeve (2040).
5. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 1, wherein: the inside second blotter (2070) that all is provided with of fourth fluting (242), and one side that fourth connecting plate (2050) was kept away from in second blotter (2070) all links firmly on shell (240).
6. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 1, wherein: the runner (2080) is attached to the outer side of the second connecting rod (2010), one end, far away from the second connecting rod (2010), of the runner (2080) is connected into the sixth open groove (2091) in a rotating mode, the outer side of the sixth open groove (2091) is arranged in the sixth connecting plate (2090), and one side, far away from the runner (2080), of the sixth connecting plate (2090) is fixedly connected to the shell (240).
7. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 2, wherein: a third buffer pad (330) is arranged in the seventh slot (311), and one side of the third buffer pad (330) far away from the latch block (320) is fixedly connected to the latch plate (310).
8. The deep geothermal energy harvesting device and the auxiliary supporting structure thereof according to claim 2, wherein: the first slot (121) is internally provided with a limiting block (340), and one side of the limiting block (340) far away from the bolt plate (310) is fixedly connected to the channel pipe (120).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011258156.1A CN112361627A (en) | 2020-11-12 | 2020-11-12 | Deep geothermal energy collection system and supplementary bearing structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011258156.1A CN112361627A (en) | 2020-11-12 | 2020-11-12 | Deep geothermal energy collection system and supplementary bearing structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112361627A true CN112361627A (en) | 2021-02-12 |
Family
ID=74514384
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011258156.1A Withdrawn CN112361627A (en) | 2020-11-12 | 2020-11-12 | Deep geothermal energy collection system and supplementary bearing structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112361627A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110283A (en) * | 2021-10-14 | 2022-03-01 | 北京恒利新源地热能科技有限公司 | Adapter, geothermal pipe and geothermal extraction system |
-
2020
- 2020-11-12 CN CN202011258156.1A patent/CN112361627A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110283A (en) * | 2021-10-14 | 2022-03-01 | 北京恒利新源地热能科技有限公司 | Adapter, geothermal pipe and geothermal extraction system |
| CN114110283B (en) * | 2021-10-14 | 2023-07-11 | 北京恒利新源地热能科技有限公司 | Adapter, geothermal pipe and geothermal extraction system |
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Application publication date: 20210212 |