CN208819470U - Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator - Google Patents
Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator Download PDFInfo
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- CN208819470U CN208819470U CN201821179795.7U CN201821179795U CN208819470U CN 208819470 U CN208819470 U CN 208819470U CN 201821179795 U CN201821179795 U CN 201821179795U CN 208819470 U CN208819470 U CN 208819470U
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- sliding
- simple harmonic
- riser
- laser
- circular slab
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Abstract
The utility model discloses laser temperature-sensitive simple harmonic oscillations to test measurement demonstrator, relates generally to teaching and experiment equipment field.Including supporting frame, sliding riser, guide post, circular slab, laser, oscillator spring, power mechanism, L-type support, timing velocity measurement mechanisms；Supporting frame includes the horizontal base being fixedly connected, fixed vertical plate, top plate, sliding riser, which is slidably connected, to be arranged on fixed vertical plate surface, heat-sensitive paper is set on sliding riser, guide post is vertically set between horizontal base and top plate, circular slab holding level is slidably connected with guide post, laser is arranged in circular slab bottom, and oscillator both ends of the spring is connect with top plate and circular slab, and power mechanism driving sliding riser is slided along fixed vertical plate level.The utility model has the beneficial effects that: can solve deficiency in the prior art, it can be measured each physics numerical quantity in simple harmonic oscillation campaign, and can be good for imparting knowledge to students, be conducive to the analysis ability of training student.
Description
Technical field
The utility model relates to teaching and experiment equipment fields, specifically laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator.
Background technique
High school physics are taken as an elective course in 3-1 (Education & Science Press) " image and formula of simple harmonic motion " section, shown in it is solid
It is scheduled on perpendicular and does the curvilinear path that the fine sand flowed out in small angle oscillation funnel is formed on plate approximatively to demonstrate letter
Harmonic motion image.But this device there are many deficiencies place: 1. single pendulum during the swing easily formed conical pendu0, cause experiment tie
Fruit is inaccurate；2. pulling dynamic hardboard cannot preferably guarantee that it does linear uniform motion；3. husky pendulum can only be drawn in experiment
Image on horizontal plane cannot allow observation of students simultaneously not have preferable observing effect to image in perpendicular；4. real
It is scattered to test equipment, is not easy to move back and forth；5. experiment does not have good expansion and ductility, do not have multi-purpose content, saves
About fund the advantages that, have certain limitation, be not suitable with fresh course promotion efficient classroom.The patent No. (NO:CN 104966439
A) simple harmonic vibration of spring vibrator sine curve synthesizes demonstrating instrument, advantage: gets ready to obtain simple harmonic vibration of spring vibrator by electric spark
Sine curve is very clear, and the curve described on trace paper can take off low coverage descriscent student displaying, demonstration effect from instrument
Fruit is very good.Shortcoming: it not can be measured analysis simple harmonic vibration of spring vibrator and move each physics numerical quantity.In " physics reality
Test " the 9th phase in 2016 " synthesizing simple harmonic motion image with laser scanning method ", the method for author was to use semiconductor laser in a text
For light source, synthesized the simple harmonic oscillation of vertical direction and the reciprocating motion of horizontal direction to obtain simple harmonic oscillation figure by laser
The overall process that luminous point vibrates sine (or cosine) THE CURVES ON WHICH A POINT MASS OSCILLATES HARMONICALLY formed after expansion can be observed by film viewing screen in picture, from
And have devised laser scanning method simple harmonic oscillation image demonstration instrument.Advantage: 1. apparatus structures are compact, bright with laser demonstration phenomenon
It is aobvious, deepen the understanding to vibrational image, use the preferable semiconductor laser of light performance, in addition vertical screen display, demonstration
Effect is preferable.Shortcoming is not can be measured each physics numerical quantity in simple harmonic vibration of spring vibrator movement.
In conclusion having a common deficiency is exactly that not can be measured in simple harmonic oscillation campaign respectively in existing technology
A physics numerical quantity.Using when swinging funnel device, there are also more insufficient.And these present simple harmonic oscillation motion demonstratings
Device, cannot be good for imparting knowledge to students, and is unfavorable for the analysis ability of training student.
Utility model content
The purpose of this utility model is to provide laser temperature-sensitive simple harmonic oscillations to test measurement demonstrator, it can solve existing skill
Deficiency in art can be measured each physics numerical quantity in simple harmonic oscillation campaign, and can be good for imparting knowledge to students, and be conducive to train
Support the analysis ability of student.
The utility model to achieve the above object, is achieved through the following technical solutions:
Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator, including supporting frame, sliding riser, guide post, circular slab, swash
Light device, oscillator spring, power mechanism；Support frame as described above body includes the horizontal base being fixedly connected, fixed vertical plate, top plate, described
Sliding riser, which is slidably connected to be arranged, is arranged heat-sensitive paper on fixed vertical plate surface, the sliding riser, and the guide post is vertically set
It sets between horizontal base and top plate, the circular slab holding level is slidably connected with guide post, and the laser is arranged in circle
Shape board bottom portion, the oscillator both ends of the spring are connect with top plate and circular slab, and the power mechanism driving sliding riser is along fixation
The sliding of riser level.
It further include inverted L shape bracket, timing velocity measurement mechanisms, the inverted L shape bracket is fixed at horizontal base, fixed vertical plate
Between, the timing velocity measurement mechanisms include U-shaped light barrier, photoelectric door and digital display chronoscope speed instrument, and the photoelectric door is arranged in inverted L
On type bracket, the U-shaped light barrier setting is on sliding riser, the level of two electrodes and U-shaped light barrier of the photoelectric door
Highly corresponding, two electrodes of the photoelectric door are connected on digital display timing meter speed instrument.
Sliding slot is equipped at the top and bottom of the fixed vertical plate, the sliding riser is connected by sliding slot and fixed vertical plate sliding
It connects.
Pulley is equipped at the top and bottom of the sliding riser, the pulley is contacted with sliding slot groove face.
The sliding slot groove face is equipped with roller ball, contacts at the top and bottom of the sliding riser with roller ball in sliding slot groove face.
The power mechanism includes servo motor, reel and bracing wire, and the servo motor drives reel rotation, described
Bracing wire is arranged on reel, the bracing wire other end and sliding riser bind, and the bracing wire holding after being straightened is horizontal.
Speed-regulating switch is additionally provided in the fixed vertical plate, the speed-regulating switch is connect with servo motor.
The circle plate top surface is equipped with grooving, and the grooving bottom surface is equipped with magnetic block, counterweight is arranged on the magnetic block, institute
Stating counterweight is two, and two counterweights are symmetrical arranged.
The prior art is compared, the utility model has the beneficial effects that:
Vertical tremor can be followed by along guide post and is moved with circular slab, laser, move when oscillator spring vertical tremor
Force mechanisms driving sliding riser is slided along fixed vertical plate level, and the movement in movement and horizontal direction on vertical direction can make
Laser gets the simple harmonic oscillation sine curve in multiple periods on heat-sensitive paper, due to servo motor revolving speed is constant, bracing wire always
It is exceptionally straight, so the sliding of sliding riser is always sliding at the uniform velocity, simple harmonic vibration of spring vibrator sine is obtained by laser routing
Curve is very clear, and simple harmonic oscillation sine curve prints vertically, can be intuitively to student's exhibition during entire laser rays
Show.
By establishing rectangular coordinate system, the sinusoidal wavelength of simple harmonic vibration of spring vibrator and amplitude can be measured, is led to
The speed for crossing control sliding riser uniform motion, can control wavelength apart from size, timing velocity measurement mechanisms can be perpendicular to sliding
Plate tests the speed, then by calculating to obtain the period of simple harmonic vibration of spring vibrator.
Since spring oscillator eventually stops swinging up and down, so distance can be leaned on gradually between sine curve Wave crest and wave trough
Closely, and there is self weight in the counterweight itself due to being arranged on circular slab, laser, circular slab, and when counterbalance mass is bigger from
Again bigger, conference is got in self weight makes the curve got more irregularly, therefore, gets over the curve got by the way that counterweight is arranged on circular slab
Rule, allow student analyze occur this phenomenon the reason of, can be with the analysis ability of training student by the method.It is not provided with weight
Code when, circular slab, laser be self-possessed very little, can ignore completely, the sine curve in preceding several periods level off to rule sine
Curve.
In conclusion not only demonstrating effect is very good for the demonstrator, simple harmonic vibration of spring vibrator can be measured and be moved through
Each physics numerical quantity in journey.And be conducive to the analysis ability of training student, it can be good for imparting knowledge to students.
Detailed description of the invention
Attached drawing 1 is the utility model concrete structure schematic diagram.
Attached drawing 2 is the utility model concrete structure schematic diagram.
Attached drawing 3 is the utility model concrete structure schematic diagram.
Attached drawing 4 is the curve graph printed using the present apparatus.
Attached drawing 5 is structural schematic diagram when sliding setting pulley at the top and bottom of riser in the utility model embodiment 1.
Attached drawing 6 is structural schematic diagram when roller ball is arranged in sliding slot groove face in the utility model embodiment 2.
Label shown in attached drawing:
1, supporting frame；2, riser is slided；3, guide post；4, circular slab；5, laser；6, oscillator spring；7, horizontal base
Seat；8, fixed vertical plate；9, top plate；10, heat-sensitive paper；11, inverted L shape bracket；12, U-shaped light barrier；13, photoelectric door；14, digital display meter
When meter speed instrument；15, sliding slot；16, pulley；17, roller ball；18, servo motor；19, reel；20, bracing wire；21, speed-regulating switch；
22, grooving；23, counterweight.
Specific embodiment
The present invention will be further illustrated below in conjunction with specific embodiments.It should be understood that these embodiments are merely to illustrate this
Utility model rather than limitation the scope of the utility model.In addition, it should also be understood that, in the content for having read the utility model instruction
Later, those skilled in the art can make various changes or modifications the utility model, and such equivalent forms equally fall within this Shen
It please limited range.
It is described in the utility model be laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator, main structure include supporting frame 1,
Slide riser 2, guide post 3, circular slab 4, laser 5, oscillator spring 6, power mechanism；Support frame as described above body 1 includes fixed connects
Horizontal base 7, fixed vertical plate 8, the top plate 9 connect, the sliding riser 2, which is slidably connected, to be arranged in 8 surface of fixed vertical plate, the cunning
Heat-sensitive paper 10 is set on dynamic riser 2, the sending of laser 5 is infrared ray, when sliding riser 2 is slided with heat-sensitive paper 10 is horizontal,
Laser 5 can get curve on heat-sensitive paper 10, and the curve got is like the curve of pencil drawing.The guide post 3 is vertically set
It sets between horizontal base 7 and top plate 9, there are two guide post 3 is set, the circular slab 4 keeps horizontal and connects with the sliding of guide post 3
It connects, the laser 5 is arranged in 4 bottom of circular slab, and 6 both ends of oscillator spring are connect with top plate 9 and circular slab 4, described dynamic
Force mechanisms driving sliding riser 2 is slided along fixed vertical plate 8 is horizontal.Apply a pulling force to oscillator spring 6 with hand, it is then loose
Hand, when oscillator 6 vertical tremor of spring, can be followed by vertical tremor along guide post 3 and move with circular slab 4, laser 5, power
Mechanism driving sliding riser 2 is slided along fixed vertical plate 8 is horizontal, and the movement in movement and horizontal direction on vertical direction can make
Laser 5 gets the simple harmonic oscillation sine curve in multiple periods on heat-sensitive paper 10, since 18 revolving speed of servo motor is constant, bracing wire
20 is exceptionally straight always, so the sliding of sliding riser 2 is always sliding at the uniform velocity, obtains the vibration of spring oscillator simple harmonic quantity by laser routing
Dynamic sine curve is very clear, and simple harmonic oscillation sine curve prints vertically, during entire laser rays can intuitively to
Student shows.
It further include inverted L shape bracket 11, timing velocity measurement mechanisms, the inverted L shape bracket 11 is fixed at horizontal base 7, consolidates
Determine between riser 8, the timing velocity measurement mechanisms include U-shaped light barrier 12, photoelectric door 13 and digital display chronoscope speed instrument 14, the light
Electric switch 13 is arranged on inverted L shape bracket 11, and the U-shaped setting of light barrier 12 is on sliding riser 2, and two of the photoelectric door 13
Electrode is corresponding with the level height of U-shaped light barrier 12, and two electrodes of the photoelectric door 13 are connected to digital display timing meter speed instrument
On 14.By establishing rectangular coordinate system, the sinusoidal wavelength of simple harmonic vibration of spring vibrator and amplitude can be measured, control is passed through
The speed of system sliding 2 uniform motion of riser, can control wavelength apart from size, timing velocity measurement mechanisms can be to sliding riser 2
It tests the speed, then by calculating to obtain the period of simple harmonic vibration of spring vibrator.Timing velocity measurement mechanisms principle is as follows: photoelectric door
13 sense that passing through digital display timing meter speed instrument 14 when the U-shaped light barrier 12 in front records time point t1, and photoelectric door 13 senses
T2 of lower time point, △ t=t2-tl are re-recorded by digital display timing meter speed instrument 14 when the U-shaped light barrier 12 at rear, if former and later two
The distance between U-shaped light barrier 12 is s, is exactly the movement speed V for sliding riser 2 with the obtained numerical value of s/ △ t；Then pass through
Ruler measures the sine curve horizontal distance L of a cycle on heat-sensitive paper 10, and obtained with L/V is exactly sinusoidal bent vertically
The period of line.
Sliding slot 15 is equipped at the top and bottom of the fixed vertical plate 8, the sliding riser 2 passes through sliding slot 15 and fixed vertical plate
8 are slidably connected.Sliding slot 15 can be supported and limit to sliding riser 2,.
Pulley 16 is equipped at the top and bottom of the sliding riser 2, the pulley 16 is contacted with 15 groove face of sliding slot.Pulley 16
Being arranged, which can make to slide riser 2 and being slidably connected for sliding slot 15, becomes rolling friction from sliding friction, reduces frictional force, makes to slide
It connects more smooth.
15 groove face of sliding slot is equipped with roller ball 17, and 2 top and bottom of sliding riser are rolled in 15 groove face of sliding slot
Ball 17 contacts.The setting of roller ball 17, which can make to slide being slidably connected for riser 2 and sliding slot 15, to be become rolling from sliding friction and rubs
It wipes, reduces frictional force, make to be slidably connected more smooth.
The power mechanism includes servo motor 18, reel 19 and bracing wire 20, and the servo motor 18 drives reel
19 rotations, the bracing wire 20 are arranged on reel 19,20 other end of bracing wire and sliding 2 bind of riser, the drawing after being straightened
Line 20 keeps horizontal.The rotation of servo motor 18 drives reel 19 to rotate, and the rotation of reel 19 can collapse bracing wire 20, bracing wire 20
Sliding riser 2 can be pulled to move horizontally during gathering.20 holding level of bracing wire after being straightened can make bracing wire 20 to sliding
The direction of pull of riser 2 keeps horizontal.
Speed-regulating switch 21 is additionally provided in the fixed vertical plate 8, the speed-regulating switch 21 is connect with servo motor 18.Speed regulation is opened
The revolving speed of servo motor 18 can be adjusted by closing 21, and then adjust sinusoidal wavelength.
4 top surface of circular slab is equipped with grooving 22, and 22 bottom surface of grooving is equipped with magnetic block, weight is arranged on the magnetic block
Code 23, the counterweight 23 are two, and two counterweights 23 are symmetrical arranged.Magnetic block is fixed counterweight 23 by magnetic force, two counterweights
23 to be symmetrical arranged be to be held round the center of plate 4 always on the axis where the center of circle.Since spring oscillator eventually stops
It only swings up and down, so distance can move closer between sine curve Wave crest and wave trough, and due to circular slab 4, laser 5, circle
There is self weight in the counterweight 23 being arranged on shape plate 4 itself, and self weight is bigger when 23 mass of counterweight is bigger, and conference is got in self weight to be made to get
Curve more irregularly, therefore, by circular slab 4 be arranged counterweight 23 keep the curve got more regular, allow student to analyze
It the reason of existing this phenomenon, can be with the analysis ability of training student by the method.Most of circular slab 4, laser 5 are relatively light
Rubber product, when being not provided with counterweight 23, circular slab 4, laser 5 be self-possessed very little, can ignore completely, preceding several periods are just
Chord curve level off to rule sine curve.
In conclusion not only demonstrating effect is very good for the demonstrator, simple harmonic vibration of spring vibrator can be measured and be moved through
Each physics numerical quantity in journey.And be conducive to the analysis ability of training student, it can be good for imparting knowledge to students.
Embodiment 1:
It is described in the utility model be laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator, main structure include supporting frame 1,
Slide riser 2, two guide posts 3, circular slab 4, laser 5, oscillator springs 6, power mechanism；Support frame as described above body 1 includes solid
Surely horizontal base 7, fixed vertical plate 8, the top plate 9 connected, the sliding riser 2, which is slidably connected, to be arranged on 8 surface of fixed vertical plate,
The mode being slidably connected are as follows: sliding slot 15,2 top and bottom of sliding riser are equipped at the top and bottom of the fixed vertical plate 8
Equipped with pulley 16, the pulley 16 is contacted with 15 groove face of sliding slot.
There is heat-sensitive paper 10 by tape-stripping on the sliding riser 2, two guide posts 3 are vertically set on horizontal base
Between seat 7 and top plate 9, the 4 holding level of circular slab is slidably connected with guide post 3, and the laser 5 is arranged in circular slab 4
Bottom, 6 both ends of oscillator spring are connect with top plate 9 and circular slab 4, and the power mechanism driving sliding riser 2 is along fixation
The horizontal sliding of riser 8.It further include inverted L shape bracket 11, timing velocity measurement mechanisms, the inverted L shape bracket 11 is fixed at horizontal base
Seat 7, between fixed vertical plate 8, the timing velocity measurement mechanisms include U-shaped light barrier 12, photoelectric door 13 and digital display chronoscope speed instrument 14,
The photoelectric door 13 is arranged on inverted L shape bracket 11, and the U-shaped setting of light barrier 12 is on sliding riser 2, the photoelectric door 13
Two electrodes it is corresponding with the level height of U-shaped light barrier 12, two electrodes of the photoelectric door 13 are connected to digital display timing
On meter speed instrument 14.The power mechanism includes servo motor 18, reel 19 and bracing wire 20, and the servo motor 18 drives coiling
19 rotation of wheel, the bracing wire 20 are arranged on reel 19,20 other end of bracing wire and sliding 2 bind of riser, after being straightened
Bracing wire 20 keeps horizontal.Speed-regulating switch 21 is additionally provided in the fixed vertical plate 8, the speed-regulating switch 21 connects with servo motor 18
It connects.4 top surface of circular slab is equipped with grooving 22, and 22 bottom surface of grooving is equipped with magnetic block, counterweight 23 is arranged on the magnetic block,
The counterweight 23 is two, and two counterweights 23 are symmetrical arranged.
Embodiment 2:
Compared with Example 1, the mode being slidably connected between riser 2 and fixed vertical plate 8 is slided in embodiment 2 are as follows: institute
It states and is equipped with sliding slot 15 at the top and bottom of fixed vertical plate 8,15 groove face of sliding slot is equipped with roller ball 17, and the sliding riser 2 pushes up
Portion and bottom are contacted with roller ball 17 in 15 groove face of sliding slot.Other structures and connection relationship are same as Example 1.
Claims (8)
1. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator, it is characterised in that: including supporting frame (1), sliding riser (2),
Guide post (3), circular slab (4), laser (5), oscillator spring (6), power mechanism；Support frame as described above body (1) includes fixed connects
Horizontal base (7), fixed vertical plate (8), the top plate (9) connect, the sliding riser (2), which is slidably connected, to be arranged in fixed vertical plate (8)
Surface, is arranged heat-sensitive paper (10) on the sliding riser (2), and the guide post (3) is vertically set on horizontal base (7) and top plate
(9) between, the circular slab (4) keeps level to be slidably connected with guide post (3), and the laser (5) is arranged in circular slab (4)
Bottom, oscillator spring (6) both ends are connect with top plate (9) and circular slab (4), power mechanism driving sliding riser (2)
It is slided along fixed vertical plate (8) is horizontal.
2. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 1, it is characterised in that: further include inverted L shape
Bracket (11), timing velocity measurement mechanisms, the inverted L shape bracket (11) are fixed between horizontal base (7), fixed vertical plate (8),
The timing velocity measurement mechanisms include U-shaped light barrier (12), photoelectric door (13) and digital display chronoscope speed instrument (14), the photoelectric door
(13) it is arranged on inverted L shape bracket (11), U-shaped light barrier (12) setting is in sliding riser (2), the photoelectric door (13)
Two electrodes it is corresponding with the level height of U-shaped light barrier (12), two electrodes of the photoelectric door (13) are connected to digital display
On timing meter speed instrument (14).
3. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 1 or claim 2, it is characterised in that: the fixation
It is equipped with sliding slot (15) at the top and bottom of riser (8), the sliding riser (2) is slided by sliding slot (15) and fixed vertical plate (8)
Connection.
4. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 3, it is characterised in that: the sliding riser
(2) top and bottom are equipped with pulley (16), and the pulley (16) contacts with sliding slot (15) groove face.
5. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 3, it is characterised in that: the sliding slot (15)
Groove face is equipped with roller ball (17), contacts at the top and bottom of the sliding riser (2) with roller ball (17) in sliding slot (15) groove face.
6. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 1, it is characterised in that: the power mechanism
Including servo motor (18), reel (19) and bracing wire (20), the servo motor (18) drives reel (19) rotation, described
Bracing wire (20) is arranged on reel (19), bracing wire (20) other end and sliding riser (2) bind, the bracing wire after being straightened
(20) keep horizontal.
7. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 6, it is characterised in that: the fixed vertical plate
(8) it is additionally provided on speed-regulating switch (21), the speed-regulating switch (21) connect with servo motor (18).
8. laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator according to claim 1, it is characterised in that: the circular slab
(4) top surface is equipped with grooving (22), and grooving (22) bottom surface is equipped with magnetic block, and counterweight (23) are arranged on the magnetic block, described
Counterweight (23) is two, and two counterweights (23) are symmetrical arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821179795.7U CN208819470U (en) | 2018-07-24 | 2018-07-24 | Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821179795.7U CN208819470U (en) | 2018-07-24 | 2018-07-24 | Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208819470U true CN208819470U (en) | 2019-05-03 |
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ID=66271452
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821179795.7U Expired - Fee Related CN208819470U (en) | 2018-07-24 | 2018-07-24 | Laser temperature-sensitive simple harmonic oscillation experiment measurement demonstrator |
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| CN (1) | CN208819470U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113990156A (en) * | 2021-11-05 | 2022-01-28 | 中国矿业大学(北京) | Double-plastid gap nonlinear dynamics experimental device |
-
2018
- 2018-07-24 CN CN201821179795.7U patent/CN208819470U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113990156A (en) * | 2021-11-05 | 2022-01-28 | 中国矿业大学(北京) | Double-plastid gap nonlinear dynamics experimental device |
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Granted publication date: 20190503 Termination date: 20200724 |