CN112610817A - Adjustable multimedia projector and adjusting method - Google Patents

Adjustable multimedia projector and adjusting method Download PDF

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Publication number
CN112610817A
CN112610817A CN202011459979.0A CN202011459979A CN112610817A CN 112610817 A CN112610817 A CN 112610817A CN 202011459979 A CN202011459979 A CN 202011459979A CN 112610817 A CN112610817 A CN 112610817A
Authority
CN
China
Prior art keywords
fixedly connected
motor
projector
guide rail
slider
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.)
Withdrawn
Application number
CN202011459979.0A
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Chinese (zh)
Inventor
朱玉荣
汤鹏飞
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Wenxiang Information Technology Co Ltd
Original Assignee
Anhui Wenxiang Information Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Anhui Wenxiang Information Technology Co Ltd filed Critical Anhui Wenxiang Information Technology Co Ltd
Priority to CN202011459979.0A priority Critical patent/CN112610817A/en
Publication of CN112610817A publication Critical patent/CN112610817A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/043—Allowing translations
    • F16M11/046—Allowing translations adapted to upward-downward translation movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
    • F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
    • F16M11/12—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting in more than one direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon Stands for scientific apparatus such as gravitational force meters
    • F16M11/02—Heads
    • F16M11/18—Heads with mechanism for moving the apparatus relatively to the stand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/02—Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle
    • F16M13/027—Ceiling supports
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention discloses an adjustable multimedia projector and an adjusting method, and relates to the technical field of projection equipment. The projector comprises a mounting plate and a projector body, wherein the lower surface of the mounting plate is rotatably connected with a rotating shaft, the lower end of the rotating shaft is fixedly connected with a rotating disc, the lower surface of the rotating disc is fixedly connected with a first guide rail, a first lead screw is fixedly connected onto the first guide rail, one end of the first lead screw is connected with a first motor, a first sliding block is connected onto the first guide rail in a sliding manner, a first connecting rod is hinged onto the first sliding block, one end of the first connecting rod is hinged onto a first push rod, the lower end of the first push rod is hinged onto a connecting plate, and the lower surface of the. The inclination angle, the orientation and the height of the projector can be adjusted, manual adjustment is not needed, and the use is convenient.

Description

Adjustable multimedia projector and adjusting method
Technical Field
The invention belongs to the technical field of projection equipment, and particularly relates to an adjustable multimedia projector and an adjusting method.
Background
The projector is a device capable of projecting images or videos onto a curtain, and along with the continuous development and progress of electronic informatization, the projector is more and more widely used, can be connected with computers, VCD, DVD, BD, game machines, DV and the like through different interfaces to play corresponding video signals, is widely suitable for families, schools, offices or entertainment places, and can be switched into different application types such as CRT, LCD, DLP and the like according to different using modes.
The projecting apparatus device structure that possess on the market at present includes the support mounting, the desktop is firm to be placed or adopt the little wall crown of area to be the installation (also be ceiling type installation, the more extensive of such mounting means taking at present, because not only can save desktop locating place, use also convenience very), and the projecting apparatus of ceiling type installation is after long-time the use, its input position and highly probably have the deviation, current projecting apparatus is generally for manual to its angle modulation, it is inconvenient to use.
Disclosure of Invention
The invention aims to provide an adjustable multimedia projector and an adjusting method, and solves the problems of position deviation and inconvenient manual adjustment of the existing projector during projection by combining a first motor, a second motor and a third motor.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to an adjustable multimedia projector and an adjusting method, wherein the adjustable multimedia projector comprises a mounting plate and a projector body, the lower surface of the mounting plate is rotatably connected with a rotating shaft, the lower end of the rotating shaft is fixedly connected with a turntable, the lower surface of the turntable is fixedly connected with a first guide rail, the first guide rail is fixedly connected with a first lead screw, one end of the first lead screw is connected with a first motor, the first guide rail is slidably connected with a first sliding block, and the first sliding block is in threaded connection with the first lead screw; a first connecting rod is hinged to the first sliding block, a first push rod is hinged to one end of the first connecting rod, the lower end of the first push rod is hinged to a connecting plate, and a projector body is fixedly connected to the lower surface of the connecting plate; the lower surface of the rotary table is symmetrically and fixedly connected with a pair of slide rails which are arranged in parallel with the first guide rail, the two slide rails are symmetrically arranged relative to the first guide rail, the slide rails are connected with a third slide block in a sliding mode, a second push rod is hinged to the third slide block, and the lower end of the second push rod is hinged to the connecting plate.
Further, the surface of the rotary table is fixedly connected with a second guide rail which is parallel to the first guide rail, a second lead screw is fixedly connected to the second guide rail, one end of the second lead screw is connected with a second motor, a second sliding block is slidably connected to the second guide rail, the second sliding block is threaded with the second lead screw, a pair of second connecting rods is rotatably connected to the second sliding block, and one end of each second connecting rod is rotatably connected with a third sliding block.
Furthermore, both ends of the second connecting rod are provided with connecting holes, and the second sliding block and the third sliding block are provided with rotating shafts rotatably connected with the connecting holes.
Further, the fixed shaft is fixedly connected to the lower surface of the turntable, the supporting rod is horizontally arranged and fixedly connected to the surface of the fixed shaft, and one end of the supporting rod is fixedly connected with a limiting sleeve movably matched with the first push rod.
Furthermore, one end of the support rod connected with the fixed shaft is fixedly connected with a connecting sleeve, and a fastening bolt is connected to the connecting sleeve in a threaded manner.
Further, the surface of the rotating shaft is fixedly connected with a first gear, the lower surface of the mounting plate is fixedly connected with a third motor, and a rotating shaft of the third motor is fixedly connected with a second gear meshed with the first gear.
Further, fixedly connected with is a pair of be used for right on the connecting plate fixed subassembly that the projecting apparatus is fixed, fixed subassembly includes a pair of threaded rod, the threaded rod run through in the connecting plate, two connect a fixed plate between the threaded rod, the fixed plate is located the projecting apparatus below, the equal threaded connection of upper and lower extreme of threaded rod has fastening nut.
Furthermore, the mounting plate is provided with a mounting hole.
An adjustment method of an adjustable multimedia projector, comprising:
a: when the first motor or the second motor is independently started, the inclination angle of the projector body can be adjusted;
b: when the first motor and the second motor are started simultaneously, the height of the projector body can be adjusted;
c: when the third motor is started, the orientation of the projector body can be adjusted.
Further, when the first motor and the second motor are started simultaneously, the moving directions of the first sliding block and the second sliding block are the same.
The invention has the following beneficial effects:
the invention can adjust the inclination angle of the projector body by controlling the start of the first motor or the second motor, can adjust the height of the projector body when controlling the first motor and the second motor to start simultaneously, and can adjust the orientation of the projector body by starting the third motor, thereby achieving the purpose of convenient use.
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 the present invention;
FIG. 2 is a schematic front view of FIG. 1;
in the drawings, the components represented by the respective reference numerals are listed below:
1-mounting plate, 2-rotary plate, 3-connecting plate, 4-rotary shaft, 5-first gear, 6-third motor, 7-second gear, 8-first guide rail, 9-first screw rod, 10-first motor, 11-first slide block, 12-second guide rail, 13-second screw rod, 14-second motor, 15-second slide block, 16-slide rail, 17-third slide block, 18-first connecting rod, 19-second connecting rod, 20-fixed shaft, 21-supporting rod, 22-connecting sleeve, 23-fastening bolt, 24-limiting sleeve, 25-first push rod, 26-second push rod, 27-projector body, 28-threaded rod, 29-fixed plate and 30-fastening nut.
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.
In the description of the present invention, it is to be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "parallel," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered as limiting the present invention.
Referring to fig. 1-2, the present invention is an adjustable multimedia projector and an adjusting method thereof, including a mounting plate 1 and a projector body 27, wherein the lower surface of the mounting plate 1 is rotatably connected with a rotating shaft 4, the lower end of the rotating shaft 4 is fixedly connected with a turntable 2, the lower surface of the turntable 2 is fixedly connected with a first guide rail 8, the first guide rail 8 is fixedly connected with a first lead screw 9, one end of the first lead screw 9 is connected with a first motor 10, the first guide rail 8 is slidably connected with a first slide block 11, and the first slide block 11 is in threaded connection with the first lead screw 9; a first connecting rod 18 is hinged on the first sliding block 11, a first push rod 25 is hinged at one end of the first connecting rod 18, the lower end of the first push rod 25 is hinged on a connecting plate 3, a projector body 27 is fixedly connected to the lower surface of the connecting plate 3, when the first motor 10 is started, the first sliding block 11 is driven to move on the first guide rail 8, the first sliding block 11 drives the first push rod 25 to move up and down through the first connecting rod 18, and therefore the inclination angle of the projector body 27 is adjusted; the lower surface of the turntable 2 is symmetrically and fixedly connected with a pair of slide rails 16 which are arranged in parallel with the first guide rail 8, the two slide rails 16 are symmetrically arranged relative to the first guide rail 8, the slide rails 16 are connected with third slide blocks 17 in a sliding manner, the third slide blocks 17 are hinged with second push rods 26, and the lower ends of the second push rods 26 are hinged on the connecting plate 3.
Preferably, the lower surface of the rotating disk 2 is fixedly connected with a second guide rail 12 parallel to the first guide rail 8, the first guide rail 8 and the second guide rail 12 are on the same straight line, the second guide rail 12 is fixedly connected with a second lead screw 13, one end of the second lead screw 13 is connected with a second motor 14, the second guide rail 12 is connected with a second slider 15 in a sliding manner, the second slider 15 is threaded with the second lead screw 13, the second slider 15 is connected with a pair of second connecting rods 19 in a rotating manner, one end of each second connecting rod 19 is connected with a third slider 17 in a rotating manner, when the second motor 14 is started, the second slider 15 slides on the second guide rail 12 to drive the third slider 17 to slide on the sliding rail 16, so that the inclination angle of the projector body 27 is adjusted.
Preferably, both ends of the second connecting rod 19 are provided with connecting holes, and the second slider 15 and the third slider 17 are provided with rotating shafts rotatably connected with the connecting holes.
Preferably, the lower surface of the turntable 2 is fixedly connected with a fixed shaft 20, the surface of the fixed shaft 20 is fixedly connected with a supporting rod 21 which is horizontally arranged, and one end of the supporting rod 21 is fixedly connected with a limit sleeve 24 which is movably matched with a first push rod 25.
Preferably, one end of the support rod 21 connected to the fixed shaft 20 is fixedly connected to a connecting sleeve 22, a fastening bolt 23 is screwed to the connecting sleeve 22, and the connecting sleeve 22 is fixed to the fixed shaft 20 through the fastening bolt 23.
Preferably, the surface of the rotating shaft 4 is fixedly connected with a first gear 5, the lower surface of the mounting plate 1 is fixedly connected with a third motor 6, the rotating shaft of the third motor 6 is fixedly connected with a second gear 7 meshed with the first gear 5, and the third motor 6 is started to drive the rotating shaft 4 to rotate so as to drive the rotating disc 2 to rotate.
Preferably, a pair of fixing components for fixing the projector 27 is fixedly connected to the connecting plate 3, each fixing component comprises a pair of threaded rods 28, each threaded rod 28 penetrates through the connecting plate 3, a fixing plate 29 is connected between the two threaded rods 28, each fixing plate 29 is arranged below the projector 27, and fastening nuts 30 are connected to the upper end and the lower end of each threaded rod 28 in a threaded manner.
Preferably, the mounting plate 1 is provided with a mounting hole, and the mounting plate 1 is fixed on the top of the wall through a bolt.
An adjustment method of an adjustable multimedia projector, comprising:
a: when the first motor 10 or the second motor 14 is independently started, the inclination angle of the projector body 27 can be adjusted;
b: when the first motor 10 and the second motor 14 are started simultaneously, the height of the projector body 27 can be adjusted;
c: when the third motor 6 is started, the orientation of the projector main body 27 can be adjusted.
Preferably, when the first motor 10 and the second motor 14 are simultaneously started, the moving directions of the first slider 11 and the second slider 15 are the same.
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 (10)

1. An adjustable multimedia projector, comprising a mounting plate (1) and a projector body (27), characterized in that:
the lower surface of the mounting plate (1) is rotatably connected with a rotating shaft (4), the lower end of the rotating shaft (4) is fixedly connected with a turntable (2), the lower surface of the turntable (2) is fixedly connected with a first guide rail (8), the first guide rail (8) is fixedly connected with a first lead screw (9), one end of the first lead screw (9) is connected with a first motor (10), the first guide rail (8) is slidably connected with a first sliding block (11), and the first sliding block (11) is in threaded connection with the first lead screw (9);
a first connecting rod (18) is hinged to the first sliding block (11), a first push rod (25) is hinged to one end of the first connecting rod (18), the lower end of the first push rod (25) is hinged to a connecting plate (3), and a projector body (27) is fixedly connected to the lower surface of the connecting plate (3);
carousel (2) lower surface symmetry fixedly connected with first guide rail (8) parallel arrangement's a pair of slide rail (16), two slide rail (16) about first guide rail (8) symmetry sets up, sliding connection has third slider (17) on slide rail (16), it has second push rod (26) to articulate on third slider (17), the lower extreme of second push rod (26) articulates on connecting plate (3).
2. The adjustable multimedia projector according to claim 1, wherein a second guide rail (12) is fixedly connected to a lower surface of the rotary table (2) and is parallel to the first guide rail (8), a second lead screw (13) is fixedly connected to the second guide rail (12), a second motor (14) is connected to one end of the second lead screw (13), a second slider (15) is slidably connected to the second guide rail (12), the second slider (15) is threaded to the second lead screw (13), a pair of second connecting rods (19) is rotatably connected to the second slider (15), and one end of the second connecting rods (19) is rotatably connected to the third slider (17).
3. The adjustable multimedia projector according to claim 2, wherein the second connecting rod (19) has connecting holes at both ends, and the second slider (15) and the third slider (17) have rotating shafts rotatably connected to the connecting holes.
4. The adjustable multimedia projector as claimed in claim 1, 2 or 3, wherein the lower surface of the rotary plate (2) is fixedly connected with a fixed shaft (20), the surface of the fixed shaft (20) is fixedly connected with a horizontally arranged supporting rod (21), and one end of the supporting rod (21) is fixedly connected with a position-limiting sleeve (24) movably matched with the first push rod (25).
5. The adjustable multimedia projector as claimed in claim 4, wherein the end of the support rod (21) connected to the fixed shaft (20) is fixedly connected to a connecting sleeve (22), and the connecting sleeve (22) is threadedly connected to a fastening bolt (23).
6. The adjustable multimedia projector according to claim 1, 2, 3 or 5, wherein a first gear (5) is fixedly connected to the surface of the rotating shaft (4), a third motor (6) is fixedly connected to the lower surface of the mounting plate (1), and a second gear (7) meshed with the first gear (5) is fixedly connected to the rotating shaft of the third motor (6).
7. The adjustable multimedia projector as claimed in claim 6, wherein a pair of fixing components for fixing the projector (27) are fixedly connected to the connecting plate (3), the fixing components comprise a pair of threaded rods (28), the threaded rods (28) penetrate through the connecting plate (3), a fixing plate (29) is connected between the two threaded rods (28), the fixing plate (29) is arranged below the projector (27), and fastening nuts (30) are respectively connected to the upper end and the lower end of each threaded rod (28) in a threaded manner.
8. An adjustable multimedia projector as claimed in claim 7, characterized in that the mounting plate (1) is provided with mounting holes.
9. An adjustment method for an adjustable multimedia projector, characterized in that: the method comprises the following steps:
a: when the first motor (10) or the second motor (14) is independently started, the inclination angle of the projector body (27) can be adjusted;
b: when the first motor (10) and the second motor (14) are started simultaneously, the height of the projector body (27) can be adjusted;
c: when the third motor (6) is started, the orientation of the projector body (27) can be adjusted.
10. An adjustable multimedia projector according to claim 9, characterized in that the first slider (11) and the second slider (15) move in the same direction when the first motor (10) and the second motor (14) are activated simultaneously.
CN202011459979.0A 2020-12-11 2020-12-11 Adjustable multimedia projector and adjusting method Withdrawn CN112610817A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011459979.0A CN112610817A (en) 2020-12-11 2020-12-11 Adjustable multimedia projector and adjusting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011459979.0A CN112610817A (en) 2020-12-11 2020-12-11 Adjustable multimedia projector and adjusting method

Publications (1)

Publication Number Publication Date
CN112610817A true CN112610817A (en) 2021-04-06

Family

ID=75233459

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011459979.0A Withdrawn CN112610817A (en) 2020-12-11 2020-12-11 Adjustable multimedia projector and adjusting method

Country Status (1)

Country Link
CN (1) CN112610817A (en)

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Application publication date: 20210406