CN110601494B - Linear drive and intelligent control curtain box application - Google Patents
Linear drive and intelligent control curtain box application Download PDFInfo
- Publication number
- CN110601494B CN110601494B CN201910958966.9A CN201910958966A CN110601494B CN 110601494 B CN110601494 B CN 110601494B CN 201910958966 A CN201910958966 A CN 201910958966A CN 110601494 B CN110601494 B CN 110601494B
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- electromagnetic coil
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- sliding rail
- magnetic suspension
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- 239000000725 suspension Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000004744 fabric Substances 0.000 claims abstract description 9
- 239000004020 conductor Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47H—FURNISHINGS FOR WINDOWS OR DOORS
- A47H5/00—Devices for drawing draperies, curtains, or the like
- A47H5/02—Devices for opening and closing curtains
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
Abstract
The patent application provides a linear driving device and an intelligent control curtain box application. The linear driving device comprises a sliding rail, a plurality of electromagnetic coils and a ring magnet, wherein the ring magnet slides on the sliding rail, the electromagnetic coils are identical in polarity direction and are arranged in a tube of the sliding rail in a straight line, a first conducting strip is arranged in the tube of the sliding rail in an electric insulation mode, a first magnetic suspension piece connected with the same polarity end of each electromagnetic coil is located at the side of the electromagnetic coil at the previous stage, and a process magnetic control switch for connecting the electromagnetic coil into a power circuit and pushing the ring magnet sequentially by taking the electromagnetic coil as a step is formed between the first magnetic suspension piece and the first conducting strip. The intelligent control curtain box of the linear driving device is applied, curtain cloth is hung along the sliding rail, and the moving end of the curtain cloth is fixedly hung on the annular magnet. The electromagnetic coils of the technical scheme become a power source for pushing the annular magnet to operate by the first-stage steps, and the electromagnetic coil has the advantages of simple structure, no mechanical wearing parts, smooth operation, low noise, low energy consumption, easy manufacture, low manufacturing cost and long service life.
Description
Technical Field
The present application relates to power take-off drives, and more particularly to linear power take-off drives.
Background
The motor is a rotary power output device utilizing the principle of cutting magnetic lines, has various structural types and functions, but generally has more complicated structural structure, high energy consumption, large working noise and high manufacturing cost, is more complicated in electric control, has higher operation standard, has changeable and complex actual working operation environment, high damage rate and high maintenance cost, and also ensures that the whole manufacturing cost is higher due to the actual application of the motor in all aspects.
Disclosure of Invention
The invention aims to simplify the structure of a power driving device, and provide a linear driving device with low energy consumption, smooth operation, easy electric control, long service life and low manufacturing cost and an intelligent control curtain box application.
The technical scheme of the linear driving device provided by the patent application is as follows: the linear driving device comprises a slide rail, a plurality of electromagnetic coils and annular magnets, wherein the slide rail is a non-magnetic conductive material pipe, the electromagnetic coils are in the same polarity direction and are arranged in the pipe of the slide rail in a straight line, first conducting strips electrically insulated from the slide rail extend in the pipe axial direction of the slide rail, the same polarity ends of the electromagnetic coils are connected in parallel, the parallel ends and the first conducting strips are connected to the two ends of a direct current power supply, a master control switch is connected in series in a power supply loop, the other ends of the electromagnetic coils are connected with first magnetic suspension sheets, the first magnetic suspension sheet of each electromagnetic coil is positioned at the side of the electromagnetic coil at the front stage, the first magnetic suspension sheet is equal in length and parallel to the first conducting strips, the annular magnets are equal in magnetic pole direction and are sleeved on the slide rail in a sliding fit manner, and a progress magnetic control switch for connecting the electromagnetic coils into the power supply loop and pushing the annular magnets in sequence with the electromagnetic coils as steps is formed between the first magnetic suspension sheets of the electromagnetic coils.
According to one preferable technical means of the whole technical scheme, a second conducting strip electrically insulated from the sliding rail is axially extended in a tube of the sliding rail, a second magnetic suspension sheet is connected in parallel to a first magnetic suspension sheet connecting end of each electromagnetic coil, the second magnetic suspension sheet of each electromagnetic coil is positioned at the side of a next-stage electromagnetic coil, is equal to the electromagnetic coil in length and parallel to the second conducting strip, a return magnetic control switch for connecting the electromagnetic coil into a power supply loop and pushing the annular magnet in reverse order by taking the electromagnetic coil as a return step is formed between the second magnetic suspension sheet of each electromagnetic coil and the second conducting strip, and a normally closed magnetic contact switch is arranged at the terminal of the first conducting strip and the starting end of the second conducting strip.
The application of the intelligent control curtain box is characterized in that the intelligent control curtain box is provided by the linear driving device, the linear driving device is arranged in the curtain box, the curtain cloth is hung along the sliding rail, and the movable end of the curtain cloth is fixedly hung on the annular magnet.
The utility model discloses a linear drive device and its intelligent control curtain box application technical scheme, ring magnet and magnetic suspension piece, solenoid and conducting strip cooperation, ring magnet is by the in-process of magnetic force promotion with solenoid insert in proper order in the power supply loop, each solenoid becomes ladder promotion ring magnet one-level power supply, in the slide rail continuous operation, it has simple structure, no mechanical vulnerable part, smooth operation, the noise is low, the energy consumption is low, easily manufacturing, the technical advantage of cost is low, especially with the applied mechanism combination, like intelligent curtain box etc. use, it is low to have whole cost, the operation is stable, long service life's advantage.
Drawings
Fig. 1 is a schematic block diagram of the unidirectional drive of the present patent application.
Fig. 2 is a schematic diagram of the present application with bidirectional driving in the forward and return directions, and the slide rail is omitted in order to avoid the interference of the structural wires without affecting the explanation of the structural composition.
Fig. 3 is a sectional structural view of fig. 2.
Detailed Description
The figure shows an implementation structure of the linear driving device disclosed in the patent application, which comprises a sliding rail 1, a plurality of electromagnetic coils 4 and a ring magnet 2. The ring magnet 2 is driven to slide on the slide rail 1, and a load can be carried on the ring magnet, and the load capacity of the ring magnet can be reasonably determined according to the driving capacity range of the device.
As shown in fig. 1 and 2, the sliding rail 1 is a non-magnetic conductive material pipe, such as stainless steel pipe, and the electromagnetic coils 4 are arranged in the same polarity direction and in a straight line in the pipe of the sliding rail 1. Specifically, each electromagnetic coil 4 in the tube of the slide rail 2 is arranged on the iron core 9 in a straight line in the same polarity direction, and the annular magnet 2 is equal in length with the electromagnetic coil 4, has the same magnetic pole direction, is sleeved on the slide rail 1 and is in sliding fit with the slide rail.
As shown in fig. 2 and 3, a first conductive strip 5 and a second conductive strip 10 electrically insulated from the slide rail 2 extend axially in the tube of the slide rail 1.
The electromagnetic coils 4 are connected in parallel at one polarity end, and the first magnetic suspension 3 and the second magnetic suspension 6 are connected in parallel at the other polarity end. The axial length of the first magnetic suspension 3 and the second magnetic suspension 6 is equal to that of the electromagnetic coil 4, and the first magnetic suspension and the second magnetic suspension are made of electric conduction and magnetic conduction materials, such as magnetic reed materials of reed pipes. The first magnetic suspension 3 of each electromagnetic coil is positioned at the side of the electromagnetic coil of the previous stage, is matched with the first conducting strip 5, is parallel to and suspended on the first conducting strip 5, and a process magnetic control switch for connecting the electromagnetic coil into a power supply loop and pushing the annular magnet 2 by taking the electromagnetic coil as a process step sequence is formed between the first magnetic suspension 3 of the electromagnetic coil 4 and the first conducting strip 5; the second magnetic suspension 6 of each electromagnetic coil 4 is positioned at the side of the next-stage electromagnetic coil, is matched with the second conducting strip 10, is parallel to and suspended on the second conducting strip 10, and a return magnetic control switch which is used for connecting the electromagnetic coil into a power supply loop and pushing the ring magnet 2 by taking the electromagnetic coil as a return step in reverse order is formed between the second magnetic suspension 6 of the electromagnetic coil and the second conducting strip 10. When the ring magnet 2 slides to approach the step progress magnetic control switch or the step return magnetic control switch, the corresponding magnetic control switch is attracted, and the magnetic control switch which is far away loses the magnetic attraction and is disconnected.
As shown in fig. 2 of the embodiment structural diagram, the left arrow is the progress direction of the ring magnet 2, the right arrow is the return direction of the ring magnet 2, and the left end is the terminal end and the right end is the starting end.
In order to realize automatic conversion of a process circuit and a return circuit, a first normally-closed magnetic contact switch K5 is arranged at the terminal end of the first conducting strip 5, and a second normally-closed magnetic contact switch K10 is arranged at the starting end of the second conducting strip 10. The parallel end A of the electromagnetic coil 4 is connected to one end of a direct current power supply, the other end of the direct current power supply is electrically connected with the first conducting strip 5 and the second conducting strip 10 through conversion between the conversion switch K and the second conducting strip, the normally closed magnetic contact switch K5 is connected in series on the conversion branch of the first conducting strip 5, the normally closed magnetic contact switch K10 is connected in series in the conversion circuit of the second conducting strip 10, the two normally closed magnetic contact switches 5 and 10 are magnetic spring pieces connected to the conducting strips, the magnetic spring pieces are pressed on the power circuit connecting contacts, and under the action of magnetic force, the magnetic spring pieces are attracted away from the power circuit connecting contacts to separate the conducting strips from the power circuit.
The action process is as follows: initial state: the ring magnet 2 is positioned at the starting end, is limited by the baffle 7, the front end of the ring magnet is slightly beyond the front end of the starting electromagnetic coil 4a, and is axially close to the rear end of the previous-stage electromagnetic coil 4a+1, the magnetic force of the ring magnet 2 enables the first magnetic suspension 3a to be attracted onto the first conducting strip 5, when the starting process works, the change-over switch K is connected with the first conducting strip change-over branch M leftwards, the starting electromagnetic coil 4a is powered on, the same electromagnetic polarity as the ring magnet 2 is generated, the ring magnet 2 is repelled to push to slide forwards, and when the front end of the ring magnet is required to exceed the rear end of the previous-stage electromagnetic coil 4a+1 to the previous-stage electromagnetic coil 4a+2, the first magnetic suspension 3a+1 of the previous-stage electromagnetic coil 4a+1 is attracted onto the first conducting strip 5, the previous-stage electromagnetic coil 4a+1 is connected into a power supply loop, the previous-stage electromagnetic coil 4a+1 is powered on, the same magnetism as the ring magnet 2 is generated, and the ring magnet 2 is repelled from continuing to move forwards. Thus, as the ring magnet 2 slides sequentially over the respective solenoids 4 in turn, the primary repulsion of each solenoid 4 along the way pushes the ring magnet 2 until it goes to the end. When the terminal is reached, the terminal baffle plate 8 prevents the annular magnet 2 from forward inertia, the magnetic spring sheet of the normally closed magnetic contact switch K5 is acted by the magnetic attraction of the annular magnet 2 and is separated from the connecting end of the power circuit, and the first conducting strip 5 is powered off. The return stroke of the ring magnet 2 corresponds to the reverse working process of the process, the ring magnet 2 is positioned at the terminal, the rear end of the ring magnet 2 slightly exceeds the rear end of the terminal electromagnetic coil 4a+n and is axially close to the front end of the next-stage electromagnetic coil 4a+n-1, the state forces the terminal second magnetic suspension 6a+n to be attracted on the second conducting strip 10, the transfer switch K is connected with the transfer branch N of the second conducting strip 10, the terminal electromagnetic coil 4a+n is conducted to generate the same magnetism as the ring magnet 2, the repulsion pushes the ring magnet 2 to slide in a return stroke, the working process of the ring magnet 2 is the same as the process, the first normally closed magnetic contact switch K5 is attracted from the new and serially connected with the transfer branch of the first conducting strip 5, so that the ring magnet 2 slides through the electromagnetic coils 4 in a reverse sequence, the next-stage repulsion of each electromagnetic coil 4 pushes the ring magnet 2 to slide in a continuous return stroke until the starting end and the return stroke of the ring magnet 2 is prevented from sliding in a return stroke by the starting end baffle 7. When the starting end is reached, the second normally-closed magnetic contact switch K10 is separated from the connecting end of the power circuit under the magnetic force of the annular magnet 2, so that the second conducting strip 10 is powered off and separated from the conversion branch of the second conducting strip 10.
The intelligent control curtain box of the linear driving device is applied, the linear driving device is arranged in the curtain box, the curtain cloth is hung along the sliding rail, the movable end of the curtain cloth is fixedly hung on the annular magnet 2 to form the intelligent control curtain box, the annular magnet 2 drives the curtain cloth to be unfolded or folded in a return mode, the intelligent control curtain box is simple in mechanical structure and electric control structure, smooth in operation, changes the complex structure of the existing curtain box, and has the technical advantages of stable operation, low noise, low energy consumption, low maintenance rate and the like, and if the intelligent control curtain box comprises a traction steel wire, a motor, a driving belt, a gear, a positioning mechanism and the like. The annular magnet 2 and the magnetic control slide rail 1 can adopt a rolling bearing matching structure with small friction.
The linear driving device can also be a unidirectional driving device. As shown in fig. 1, a first conductive strip 5 electrically insulated from the sliding rail 2 extends axially in the tube of the sliding rail 1, each electromagnetic coil 4 in the tube of the sliding rail 2 is arranged on the iron core 7 in a straight line in the same polarity direction, the annular magnet 2 is equal to the electromagnetic coil 4 in length, the magnetic pole directions are the same, sleeved and in sliding fit on the sliding rail 1, the same polarity end of each electromagnetic coil 4 is connected in parallel, the other polarity end is connected in parallel with the first magnetic suspension 3, the first magnetic suspension 3 of each electromagnetic coil is positioned at the side of the electromagnetic coil of the previous stage and is matched with the first conductive strip 5, and is parallel and suspended on the first conductive strip 5, the parallel end a and the first conductive strip 5 are connected with two ends of a direct current power supply to form a power supply loop, and a master control switch K1 is connected in series in the power supply loop. The first magnetic suspension 3 and the first conductive strip 5 of each electromagnetic coil 4 form a process magnetic control switch which connects the electromagnetic coils into a power supply loop and pushes the ring magnet 2 by taking each electromagnetic coil as a process step.
The first magnetic suspension sheet 3 and the second magnetic suspension sheet 6 in the scheme are arranged in a sealed insulating tube shell, such as a glass tube, and the first conducting strip 5 and the second conducting strip 10 respectively penetrate through the glass tube of each first magnetic suspension sheet 3 and the glass tube of each second magnetic suspension sheet 6 to form a process magnetic control switch and a return magnetic control switch which are separated from the outside.
Claims (6)
1. A linear driving device comprises a sliding rail (1), a plurality of electromagnetic coils (4) and a ring magnet (2);
the sliding rail (1) is a non-magnetic conduction material pipe;
it is characterized in that the method comprises the steps of,
the electromagnetic coils (4) are identical in polarity direction and are arranged in a straight line in the tube of the sliding rail (1), the identical polarity ends of the electromagnetic coils (4) are connected in parallel, and the parallel end (A) is connected to one end of a direct current power supply;
the annular magnet (2) is equal to the electromagnetic coil (4) in length and the same in magnetic pole direction and is sleeved on the sliding rail (1) in a sliding fit manner;
a first conducting strip (5) which is electrically insulated from the sliding rail (1) is axially extended in the pipe of the sliding rail (1), and the other end of the direct current power supply is electrically connected with the terminal of the first conducting strip (5) through a transfer switch (K) and a normally closed magnetic contact switch (K5) at the terminal of the first conducting strip (5);
the other end of each electromagnetic coil (4) is connected with a first magnetic suspension sheet (3), the first magnetic suspension sheet (3) of each electromagnetic coil is positioned at the side of the electromagnetic coil at the previous stage, is equal to the electromagnetic coil and is parallel to a first conducting strip (5), and a progress magnetic control switch for sequentially connecting the steps of the electromagnetic coils at all stages into a power supply loop and pushing the annular magnet (2) is formed:
the annular magnet (2) in an initial state is arranged at the initial end, the front end of the annular magnet (2) slightly exceeds the front end of the initial electromagnetic coil (4 a) and is axially close to the rear end of the previous-stage electromagnetic coil (4a+1), the first magnetic suspension sheet (3 a) of the initial electromagnetic coil (4 a) is attracted onto the first conductive strip (5) due to the magnetic force of the annular magnet (2), when the transfer switch (K) is started in a current loop, the initial electromagnetic coil (4 a) generates the same electromagnetic polarity as that of the annular magnet (2) and pushes the annular magnet (2) forwards, when the annular magnet (2) slides and is expected to exceed the previous-stage electromagnetic coil (4a+1) to the rear end of the previous-stage electromagnetic coil (4a+2), the first magnetic suspension sheet (3a+1) of the previous-stage electromagnetic coil (4a+1) is attracted onto the first conductive strip (5), the previous-stage electromagnetic coil (4a+1) is connected into a power circuit, the previous-stage electromagnetic coil (4a+1) is connected with a power supply, the same polarity and pushes the annular magnet (2) forwards again, and the normally-closed electromagnetic coil (2) continuously pushes the annular magnet (2) forwards along the first-stage electromagnetic coil (4 a terminal (5) and the normally-closed electromagnetic coil (2) is disconnected from the first-stage electromagnetic coil (5).
2. A linear drive according to claim 1, characterized in that the first magnetic suspension plates (3) are enclosed in an insulating envelope, and the first conductor bars (5) pass through the insulating envelope of each first magnetic suspension plate (3) in turn, forming a process magnetic control switch separated from the outside.
3. Linear drive according to claim 1, characterized in that the ring magnet (2) is in rolling bearing engagement with the magnetically controlled slide (1).
4. A linear driving device according to claim 1, 2 or 3, characterized in that a second conductive strip (10) electrically insulated from the sliding rail (1) is axially extended in the tube of the sliding rail (1), a second magnetic suspension (6) is connected in parallel to the first magnetic suspension connection end of each electromagnetic coil (4), the second magnetic suspension (6) of each electromagnetic coil is positioned at the side of the electromagnetic coil at the subsequent stage, is equal to the electromagnetic coil and is parallel to the second conductive strip (10), a return magnetic control switch for connecting the electromagnetic coil into a power circuit and pushing the ring magnet (2) in reverse order by taking the electromagnetic coil as a return step is formed between the second magnetic suspension (6) of each electromagnetic coil and the second conductive strip (10), and a normally closed magnetic contact switch (K10) is arranged at the starting end of the second conductive strip (10).
5. A linear driving device according to claim 4, characterized in that the second magnetic suspension plates (6) are enclosed in an insulating envelope, and the second conductive strips (10) pass through the insulating envelope of each second magnetic suspension plate (6) in turn, forming a return magnetic control switch separated from the outside.
6. An intelligent control curtain box application of a linear driving device as claimed in any one of claims 1-5, characterized in that the linear driving device is arranged in the curtain box, curtain cloth is hung along a sliding rail (1), and the moving end of the curtain cloth is fixedly hung on a ring magnet (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910958966.9A CN110601494B (en) | 2019-10-10 | 2019-10-10 | Linear drive and intelligent control curtain box application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910958966.9A CN110601494B (en) | 2019-10-10 | 2019-10-10 | Linear drive and intelligent control curtain box application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110601494A CN110601494A (en) | 2019-12-20 |
| CN110601494B true CN110601494B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910958966.9A Active CN110601494B (en) | 2019-10-10 | 2019-10-10 | Linear drive and intelligent control curtain box application |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112060255A (en) * | 2020-08-14 | 2020-12-11 | 江西安竹科技有限公司 | Swift efficient bamboo timber hot pressing advancing device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980190A (en) * | 1982-10-28 | 1984-05-09 | Oki Electric Ind Co Ltd | Dc brushless linear motor |
| CN1095527A (en) * | 1993-05-15 | 1994-11-23 | 段汝熙 | Magneto-resistance stepping linear motor |
| JPH0998883A (en) * | 1995-10-09 | 1997-04-15 | Niles Parts Co Ltd | Curtain opening/closing device |
| CN2659017Y (en) * | 2003-09-29 | 2004-11-24 | 施伟 | New type linear electric motor |
| CN2729025Y (en) * | 2004-08-22 | 2005-09-28 | 戴开煌 | D.C. linear electric motor driven type door of elevator |
| CN103068705A (en) * | 2010-04-12 | 2013-04-24 | 艾格特克斯针织纺织工业有限公司 | Direct traverse device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL227379B1 (en) * | 2013-10-29 | 2017-11-30 | Centrum Badań Kosmicznych Polskiej Akademii Nauk | Electromagnetic drive, the winding core and method for manufacturing the electromagnetic drive |
-
2019
- 2019-10-10 CN CN201910958966.9A patent/CN110601494B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5980190A (en) * | 1982-10-28 | 1984-05-09 | Oki Electric Ind Co Ltd | Dc brushless linear motor |
| CN1095527A (en) * | 1993-05-15 | 1994-11-23 | 段汝熙 | Magneto-resistance stepping linear motor |
| JPH0998883A (en) * | 1995-10-09 | 1997-04-15 | Niles Parts Co Ltd | Curtain opening/closing device |
| CN2659017Y (en) * | 2003-09-29 | 2004-11-24 | 施伟 | New type linear electric motor |
| CN2729025Y (en) * | 2004-08-22 | 2005-09-28 | 戴开煌 | D.C. linear electric motor driven type door of elevator |
| CN103068705A (en) * | 2010-04-12 | 2013-04-24 | 艾格特克斯针织纺织工业有限公司 | Direct traverse device |
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| CN110601494A (en) | 2019-12-20 |
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