CN111220418A - Water quality detection device for water pollution control - Google Patents
Water quality detection device for water pollution control Download PDFInfo
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- CN111220418A CN111220418A CN202010113092.XA CN202010113092A CN111220418A CN 111220418 A CN111220418 A CN 111220418A CN 202010113092 A CN202010113092 A CN 202010113092A CN 111220418 A CN111220418 A CN 111220418A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/16—Devices for withdrawing samples in the liquid or fluent state with provision for intake at several levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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Abstract
The invention relates to a water quality detection device for water pollution control, which comprises a detection sampling mechanism, wherein the detection sampling mechanism comprises a sampling unit, a linkage unit, a lifting unit and a driving unit, the linkage unit is connected with a plurality of sampling units, and the linkage unit is connected with the lifting unit and the driving unit; the sampling unit, the interlocking unit, the lifting unit and the driving unit are all arranged on a central shaft; the lifting unit drives the interlocking unit and the sampling unit to descend, the interlocking unit opens and closes the sampling unit one by one while descending, and samples the water body, so that the sampling of the water bodies with different depths is realized; the invention can automatically sample, adopts a pure mechanical structure, has lower cost, is easy to be arranged at a water quality detection point, and saves manpower and material resources.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a water quality detection device for water pollution control.
Background
The water pollution control system planning is to make an optimal plan of the pollution control system by a method of urban (or regional) water system environmental system engineering. The main contents are as follows: the method is based on the laws and standards issued by the state, takes environmental protection science and technology and regional economic development planning as guidance, takes the optimal comprehensive benefit of a regional water pollution control system as a target and takes the optimal applicable prevention and control technology as a countermeasure measure group, comprehensively considers the pollution source occurrence, prevention and control, pollution discharge system, sewage treatment, water quality and the relationship between the water quality and economic development, technical improvement and enhanced management, carries out systematic investigation, monitoring, evaluation, prediction, simulation and optimization decision, and seeks the overall optimized near-term and long-term pollution control planning scheme. 1, planning the optimal water quality, including minimum reduction planning of a sewage discharge outlet, optimized treatment planning of the sewage discharge outlet, optimized uniform treatment planning and optimized planning of regional sewage delivery and treatment; 2. and (3) performing multi-scheme simulation optimization planning of water pollution control. The latter is a practical and effective regional water pollution control system planning method. And after the sewage is treated, the water quality needs to be detected before the sewage is discharged, whether the sewage treatment reaches the standard is judged according to the detection structure, and then the discharge is controlled.
The water quality detection device for water pollution control in the prior art has the following problems: need artifical scene collection water sample, detect many times, manual operation work efficiency is low to waste time and energy.
Disclosure of Invention
The invention aims to solve the problems and provide an automatic low-cost multi-depth sampling water quality detection device for water pollution control.
The invention realizes the purpose through the following technical scheme:
the water quality detection device for water pollution control comprises a detection sampling mechanism, wherein the detection sampling mechanism comprises a sampling unit, a linkage unit, a lifting unit and a driving unit, the linkage unit is connected with a plurality of sampling units, and the linkage unit is connected with the lifting unit and the driving unit; the sampling unit, the interlocking unit, the lifting unit and the driving unit are all arranged on a central shaft; the lifting unit drives the interlocking unit and the sampling unit to descend, the interlocking unit opens and closes the sampling unit one by one while descending, samples the water body, and the sampling of the water body of different depths is realized.
As a further optimization scheme of the invention, the interlocking unit comprises a base, a disk body, a first sheave and a second sheave, wherein a through hole in clearance fit with a central shaft is arranged in the center of the disk body, part of the disk body protrudes outwards to form an extending part, a first deflector rod is fixedly arranged at the top of the extending part, a plurality of first sheaves which are uniformly distributed in an annular array are arranged outside the disk body, a first sheave shaft is fixedly arranged in the center of the first sheave, the upper end of the first sheave shaft is connected with the base through a bearing, the base is positioned above the disk body, and the through hole in clearance fit with the central shaft is arranged in the center of the base; the top of the tray body is provided with a second grooved wheel which is fixedly connected with the tray body and is arranged concentrically with the tray body, and the center of the second grooved wheel is also provided with a through hole in clearance fit with the central shaft. The disk body and the machine base are in clearance fit with the central shaft, so that the whole interlocking unit can be in sliding connection with the central shaft.
As a further optimization scheme of the invention, the first grooved wheel and the second grooved wheel are both provided with the poking grooves distributed in the uniform annular array, and the number of the poking grooves of the second grooved wheel is the same as the total number of the first grooved wheel. The second grooved wheel can drive the disc body to rotate for a certain angle to poke a corresponding first grooved wheel once due to the fact that the driving mechanism is matched with the poking groove to rotate once.
As a further optimization scheme of the invention, the base is connected with the disc body through a connecting rod.
As a further optimization scheme of the invention, the lifting unit comprises a stop dog and a retaining sleeve, the retaining sleeve is fixedly arranged at the center of the bottom of the tray body, a through hole in clearance fit with the central shaft is formed in the center of the retaining sleeve, a plurality of steps which are uniformly distributed in an annular array are arranged on the retaining sleeve, the height of each step is reduced in sequence, and the stop dog matched with the steps is arranged on the central shaft. The rotation of disk body can drive the rotation of spacer sleeve, and when the highest step of spacer sleeve and the epaxial dog cooperation of center, disk body and interlocking unit are in the highest position, and when the spacer sleeve rotated next step and dog cooperation, disk body and interlocking unit height were because step of action of gravity decline, and disk body rotation a week, a plurality of step was also descended thereupon to interlocking unit height, realized the decline of step.
As a further optimization scheme of the invention, the cross section of the stop block is the same as that of the step.
As a further optimized scheme of the present invention, the driving unit includes a rotating arm, a second driving lever, a motor and a sliding seat, the second driving lever is disposed at the bottom of one end of the rotating arm, the other end of the rotating arm is fixedly connected to an output shaft of the motor, the motor is fixedly disposed on the sliding seat, and the sliding seat is sleeved on the central shaft and is slidably connected to the central shaft. The sliding seat provides a mounting platform for the motor, the motor serves as a power unit to drive the rotating arm to rotate, and the second shifting rod drives the second grooved wheel to rotate so as to drive the interlocking unit.
As a further optimization scheme of the invention, a longitudinal limiting mechanism is arranged between the sliding seat and the central shaft, and comprises a sliding groove arranged on the central shaft and arranged along the axis of the central shaft and a sliding block arranged in the sliding seat and matched with the sliding groove. The sliding groove and the sliding block are matched to limit the rotation of the sliding seat and cannot influence the longitudinal movement of the sliding seat.
As a further optimization scheme of the invention, the sampling unit comprises a sampling tank and an opening and closing mechanism, the opening and closing mechanism is arranged in the sampling tank and comprises an opening and closing shaft, an opening and closing baffle plate and a sampling port, the opening and closing shaft is arranged at the center of the sampling tank, the top end of the opening and closing shaft is connected with the lower end of the first sheave shaft through a connector, the opening and closing baffle plate is fixedly arranged at the bottom of the opening and closing shaft, the sampling port is arranged at the bottom of the sampling tank, and a notch part matched with the sampling port is arranged on the opening and closing baffle.
The invention has the beneficial effects that:
1) the invention can automatically sample, adopts a pure mechanical structure, has lower cost, is easy to be configured at a water quality detection point, and saves manpower and material resources;
2) the invention can automatically collect water samples of multi-stage water depth in a segmented manner, the collected water samples are rich, and the water quality of the water quality monitoring point can be well reflected.
Drawings
FIG. 1 is a top view of the present invention in one embodiment;
FIG. 2 is a schematic structural diagram of an interlocking unit and a driving unit according to the first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a chain unit according to the first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a sampling unit according to one embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a tray of the interlocking unit according to the first embodiment of the invention;
FIG. 6 is a first schematic diagram illustrating an internal structure of a sampling unit according to a first embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating an internal structure of a sampling unit according to a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a lifting unit according to the first embodiment of the present invention;
fig. 9 is a schematic structural view of the spacer according to the first embodiment of the present invention.
In the figure: the device comprises a sampling unit 1, a linkage unit 2, a lifting unit 3, a driving unit 4 and a central shaft 5;
the sampling device comprises a sampling tank 11, an opening and closing mechanism 12, a bracket 13, an opening and closing shaft 121, an opening and closing baffle 122 and a sampling port 123;
The stop block 31, the stop sleeve 32 and the step 321;
a rotating arm 41, a second lever 42, a motor 43 and a slider 44.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example one
As shown in fig. 1 to 9, the water quality detection device for water pollution control comprises a detection sampling mechanism, wherein the detection sampling mechanism comprises a sampling unit 1, a linkage unit 2, a lifting unit 3 and a driving unit 4, the linkage unit 2 is connected with a plurality of sampling units 1, and the linkage unit 2 is connected with the lifting unit 3 and the driving unit 4; the sampling unit 1, the interlocking unit 2, the lifting unit 3 and the driving unit 4 are all arranged on a central shaft 5; lifting unit 3 drives chain unit 2 and sampling unit 1 and descends, and chain unit 2 opens and close sampling unit 1 one by one when descending, samples the water, realizes the sampling to the water of the different degree of depth.
The interlocking unit 2 comprises a base 21, a disc body 22, a first grooved pulley 23 and a second grooved pulley 24, wherein a through hole in clearance fit with the central shaft 5 is formed in the center of the disc body 22, part of the disc body 22 protrudes outwards to form an extending part, a first deflector rod 25 is fixedly arranged at the top of the extending part, a plurality of first grooved pulleys 23 which are uniformly distributed in an annular array manner are arranged outside the disc body 22, a first grooved pulley shaft is fixedly arranged in the center of the first grooved pulley 23, the upper end of the first grooved pulley shaft is connected with the base 21 through a bearing, the base 21 is positioned above the disc body 22, and the through hole in clearance fit with the central shaft 5 is formed in the center of the base 21; the top of the tray body 22 is provided with a second grooved pulley 24, the second grooved pulley 24 is fixedly connected with the tray body 22 and is arranged concentrically with the tray body 22, and the center of the second grooved pulley 24 is also provided with a through hole in clearance fit with the central shaft 5. The disc body 22 and the base 21 are in clearance fit with the central shaft 5, so that the whole interlocking unit 2 can be in sliding connection with the central shaft 5.
Preferably, the first grooved wheel 23 and the second grooved wheel 24 are both provided with the dial grooves distributed in a uniform annular array, and the number of the dial grooves of the second grooved wheel 24 is the same as the total number of the first grooved wheel 23. The second grooved wheel 24 rotates once due to the driving mechanism matching with the groove poking mechanism, and drives the disc body 22 to rotate for a certain angle to poke once for a corresponding first grooved wheel 23.
Preferably, the base 21 is connected with the tray 22 through a connecting rod.
The lifting unit 3 comprises a stop block 31 and a stop sleeve 32, the stop sleeve 32 is fixedly arranged at the center of the bottom of the disc body 22, a through hole in clearance fit with the central shaft 5 is formed in the center of the stop sleeve 32, a plurality of steps 321 distributed in an even annular array are arranged on the stop sleeve 32, the height of each step 321 is reduced in sequence, and the stop block 31 matched with the step 321 is arranged on the central shaft 5. The rotation of the tray body 22 can drive the rotation of the retaining sleeve 32, when the highest step 321 of the retaining sleeve 32 is matched with the stop block 31 on the central shaft 5, the tray body 22 and the interlocking unit 2 are at the highest position, when the retaining sleeve 32 rotates to the next step 321 to be matched with the stop block 31, the height of the tray body 22 and the height of the interlocking unit 2 descend by one step 321 under the action of gravity, the tray body 22 rotates for a circle, and the height of the interlocking unit 2 also descends by a plurality of steps 321, so that the step 321 type descending is realized.
Preferably, the stopper 31 has the same cross-section as the step 321.
The driving unit 4 comprises a rotating arm 41, a second shifting lever 42, a motor 43 and a sliding seat 44, wherein the second shifting lever 42 is arranged at the bottom of one end of the rotating arm 41, the other end of the rotating arm is fixedly connected with an output shaft of the motor 43, the motor 43 is fixedly arranged on the sliding seat 44, and the sliding seat 44 is sleeved on the central shaft 5 and is in sliding connection with the central shaft 5. The sliding seat 44 provides a mounting platform for the motor 43, and the motor 43 serves as a power unit to drive the rotating arm 41 to rotate and drive the second sheave 24 to rotate through the second shifting lever 42, so as to drive the interlocking unit 2.
Preferably, the sliding seat 44 is located below the base 21, and when the base 21 of the interlocking unit 2 descends, the sliding seat 44 and the motor 43 are pushed to move downwards synchronously, so that the second shift lever 42 is prevented from being disengaged from the second grooved wheel 24.
Preferably, in order to avoid the reaction force of the second sheave 24 on the rotating arm 41 being transmitted to the motor 43 to drive the motor 43 and the sliding seat 44 to rotate, a longitudinal limiting mechanism is arranged between the sliding seat 44 and the central shaft 5, and the longitudinal limiting mechanism comprises a sliding groove arranged on the central shaft 5 and arranged along the axis of the central shaft 5 and a sliding block arranged in the sliding seat 44 and matched with the sliding groove. The cooperation of the runner with the slider restricts the rotation of the slider 44 and does not affect its longitudinal movement.
Preferably, the invention provides an assembly structure of a sampling tank 11, and specifically provides a support 13, wherein a hole matched with the sampling tank 11 is formed in the support 13, the sampling tank 11 is fixedly arranged in the hole of the support 13, and the support 13 is connected with an upper machine base 21 through a connecting rod. Following the common lifting of the interlocking units 2.
Preferably, the sampling tank 11 is connected with a water pump above through a pipeline, and the water pump is used for pumping out a water sample inside the sampling tank 11.
The motor 43 is a controllable servo motor 43, and is connected with an upper computer and a power supply through a driver. The rotation angle and the rotation speed can be controlled.
It is necessary that the motor 43 be externally provided with a waterproof case. The waterproof housing can isolate the motor 43 for normal operation within the body of water.
The principle of the invention is as follows: the central shaft 5 is fixed as a supporting structure of the device, the rotating arm 41 of the driving mechanism can drive the second deflector rod 42 to drive the second grooved pulley 24 to rotate, and the grooved pulley transmission can make the disc body 22 rotate at fixed intervals by a fixed angle, one rotation of the disc body 22 can drive one rotation of the first grooved pulley 23 on the outer side, and one rotation of the first grooved pulley 23 can drive one sampling tank 11 to be opened and closed for one sampling;
meanwhile, one rotation of the disc body 22 drives the bottom spacer 32 to rotate to the next step 321, so that the sampling unit 1 and the interlocking unit 2 integrally descend by one step 321;
these two synchronized processes produce a result: after one sampling tank 11 samples, the sampling unit 1 and the interlocking unit 2 synchronously descend by the height of one step 321, and then the next sampling tank 11 samples the water body with the depth, and then the sampling unit 1 and the interlocking unit 2 descend by the height of one step 321, so that each sampling tank 11 respectively samples the water body with each depth.
Example two
As a specific embodiment, the first sheave 23 is provided with three shifting grooves, the first shifting column passes through the first sheave 23 in sequence to drive the first shifting column to rotate 120 °, at this time, the central angle of the notch portion of the opening and closing baffle 122 is 60 °, the sampling tank 11 is provided with three sampling ports 123 distributed in an even annular array, the central angle of the sampling ports 123 is 60 °, when the first sheave shaft of the first sheave 23 rotates 120 °, the opening and closing shaft 121 drives the opening and closing baffle 122 to rotate 120 °, so that the notch portion can pass through one sampling port 123 once, and one opening and closing of one sampling port 123 is completed.
EXAMPLE III
On the basis of the first embodiment, the invention provides a device for resetting equipment, and particularly provides a lifting mechanism which is arranged on a mounting platform above the equipment, is connected with a disc body 22 of a locking unit 2 and can drive the whole locking unit 2 to ascend, after the locking unit 2 ascends, a blocking sleeve 32 of a lifting unit 3 is separated from a stop block 31, and a motor 43 can drive the blocking sleeve 32 and the locking unit 2 to reset.
The lifting mechanism can be various lifting devices such as a winch and the like or a linear driving mechanism. In particular to a winch, one end of a steel wire rope on a winding drum of the winch is connected with the disc body 22 of the interlocking unit 2.
Another simpler mode can adopt the manual mode to drive the interlocking unit 2 to rise and reset by the pull rope when taking away the sample.
Example four
On the basis of the first embodiment, the invention provides a method for detecting equipment, wherein a water pump is used for pumping water samples in each sampling tank 11 to each detection equipment for detection.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (9)
1. Water quality detection device for water pollution control, its characterized in that: the device comprises a detection sampling mechanism, wherein the detection sampling mechanism comprises a sampling unit, a linkage unit, a lifting unit and a driving unit, the linkage unit is connected with a plurality of sampling units, and the linkage unit is connected with the lifting unit and the driving unit; the sampling unit, the interlocking unit, the lifting unit and the driving unit are all arranged on a central shaft; the lifting unit drives the interlocking unit and the sampling unit to descend, the interlocking unit opens and closes the sampling unit one by one while descending, samples the water body, and the sampling of the water body of different depths is realized.
2. The water quality detecting apparatus for water pollution control according to claim 1, wherein: the interlocking unit comprises a base, a disc body, a first grooved pulley and a second grooved pulley, wherein a through hole in clearance fit with the central shaft is formed in the center of the disc body, part of the disc body protrudes outwards to form an extending part, a first deflector rod is fixedly arranged at the top of the extending part, a plurality of first grooved pulleys distributed in a uniform annular array are arranged outside the disc body, a first grooved pulley shaft is fixedly arranged in the center of each first grooved pulley, the upper end of each first grooved pulley shaft is connected with the base through a bearing, the base is positioned above the disc body, and the through hole in clearance fit with the central shaft is formed in the center of the base; the top of the tray body is provided with a second grooved wheel which is fixedly connected with the tray body and is arranged concentrically with the tray body, and the center of the second grooved wheel is also provided with a through hole in clearance fit with the central shaft.
3. The water quality detecting apparatus for water pollution control according to claim 2, wherein: the first grooved wheel and the second grooved wheel are both provided with poking grooves which are uniformly distributed in an annular array, and the number of the poking grooves of the second grooved wheel is the same as the total number of the first grooved wheels.
4. The water quality detecting apparatus for water pollution control according to claim 2, wherein: the base is connected with the disc body through a connecting rod.
5. The water quality detecting apparatus for water pollution control according to claim 1, wherein: the lifting unit comprises a stop block and a blocking sleeve, the blocking sleeve is fixedly arranged at the center of the bottom of the tray body, a through hole in clearance fit with the central shaft is formed in the center of the blocking sleeve, a plurality of steps distributed in an even annular array are arranged on the blocking sleeve, the height of each step is reduced in sequence, and the stop block matched with the step is arranged on the central shaft.
6. The water quality detecting apparatus for water pollution control according to claim 5, wherein: the cross section of the stop block is the same as that of the step.
7. The water quality detecting apparatus for water pollution control according to claim 1, wherein: the driving unit comprises a rotating arm, a second driving lever, a motor and a sliding seat, wherein the second driving lever is arranged at the bottom of one end of the rotating arm, the other end of the rotating arm is fixedly connected with an output shaft of the motor, the motor is fixedly arranged on the sliding seat, and the sliding seat is sleeved on the central shaft and is in sliding connection with the central shaft.
8. The water quality detecting apparatus for water pollution control according to claim 7, wherein: and a longitudinal limiting mechanism is arranged between the sliding seat and the central shaft and comprises a sliding groove arranged on the central shaft and arranged along the axis of the central shaft and a sliding block arranged in the sliding seat and matched with the sliding groove.
9. The water quality detecting apparatus for water pollution control according to claim 1, wherein: the sample unit is including taking a sample jar and start/stop mechanism, and the inside of taking a sample jar is equipped with start/stop mechanism, and start/stop mechanism is including opening and close the axle, opening and close baffle and sample connection, and the center of taking a sample jar is located to the axle of opening and close, and the lower extreme of first sheave axle is connected through the connector in the top of opening and close the axle, and the fixed baffle of opening and close that is equipped with in bottom of opening and close the axle, the bottom of taking a sample jar is equipped with the sample connection, open and close be.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010113092.XA CN111220418B (en) | 2020-02-24 | 2020-02-24 | Water quality detection device for water pollution control |
| AU2020104219A AU2020104219A4 (en) | 2020-02-24 | 2020-12-22 | Water quality detection device for water pollution control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010113092.XA CN111220418B (en) | 2020-02-24 | 2020-02-24 | Water quality detection device for water pollution control |
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| CN111220418A true CN111220418A (en) | 2020-06-02 |
| CN111220418B CN111220418B (en) | 2022-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010113092.XA Active CN111220418B (en) | 2020-02-24 | 2020-02-24 | Water quality detection device for water pollution control |
Country Status (2)
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| CN (1) | CN111220418B (en) |
| AU (1) | AU2020104219A4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112985916A (en) * | 2021-04-02 | 2021-06-18 | 安徽国泰众信检测技术有限公司 | Sampling device for food detection |
| CN116879522A (en) * | 2023-07-25 | 2023-10-13 | 生态环境部南京环境科学研究所 | Rapid tracing method and device for sudden water pollution of drinking water source |
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| CN113960276B (en) * | 2021-10-29 | 2023-10-20 | 王庭祺 | Improved generation surface water environment detection device |
| CN114019127B (en) * | 2021-11-08 | 2024-05-10 | 山东省地质矿产勘查开发局八〇一水文地质工程地质大队 | Underground water quantity detector special for underground water resource detection |
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| CN117740467A (en) * | 2023-11-30 | 2024-03-22 | 苏州嘉济智慧环境科技有限公司 | Sampling system and sampling method for water pollution treatment |
| CN117703357B (en) * | 2024-02-05 | 2024-04-26 | 西南石油大学 | Medium-deep geothermal well monitoring equipment |
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- 2020-12-22 AU AU2020104219A patent/AU2020104219A4/en not_active Ceased
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| CN112985916B (en) * | 2021-04-02 | 2022-06-07 | 安徽国泰众信检测技术有限公司 | Sampling device for food detection |
| CN116879522A (en) * | 2023-07-25 | 2023-10-13 | 生态环境部南京环境科学研究所 | Rapid tracing method and device for sudden water pollution of drinking water source |
| CN116879522B (en) * | 2023-07-25 | 2024-04-09 | 生态环境部南京环境科学研究所 | Rapid tracing method and device for sudden water pollution of drinking water source |
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| CN111220418B (en) | 2022-05-06 |
| AU2020104219A4 (en) | 2021-03-11 |
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