CN215007215U

CN215007215U - Day and night length change demonstration instrument

Info

Publication number: CN215007215U
Application number: CN202121499623.XU
Authority: CN
Inventors: 孙典广; 孙心远
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-03
Filing date: 2021-07-03
Publication date: 2021-12-03
Anticipated expiration: 2031-07-03

Abstract

The utility model belongs to a demonstration is geographical teaching instrument of length change round clock. The device comprises a diurnal hemisphere circular drawing board simulating a diurnal hemisphere side view, a nocturnal hemisphere circular drawing board simulating a nocturnal hemisphere side view, an arrow simulating sunlight, a central shaft connecting the diurnal drawing board and the sunlight at the circle center, two limiting stops limiting the moving range of a direct sunlight point and a limiting stop lever. By rotating the chart board, the position of the solar direct point is simulated to move back and forth between the south-north return lines, and the change of the day and night length and the solar radiation distribution of all parts of the earth along with the latitude and the season is demonstrated. The utility model discloses, can demonstrate out with teaching key points such as solar direct-emitting point position, round clock hemisphere, round clock length and situation of change, solar radiation distribution very directly perceived clearly, the student of being convenient for understands and accepts, breaks through the important and difficult point of teaching better. The novel teaching demonstration device is simple in structure and low in manufacturing cost, and is convenient for teachers and students to carry and operate and demonstrate in classrooms.

Description

Day and night length change demonstration instrument

Technical Field

The utility model belongs to a teaching instrument, the more specifically teaching instrument that demonstrates length and solar radiation distribution around the clock and change along with latitude and season that says so.

Background

The junior middle school geography teaching, the earth movement and climate are part of contents, the knowledge principle is abstract and complex, and the junior middle school students are difficult to understand, the teaching difficulty is very high, and the teaching key point is also provided.

The existing teaching instrument for demonstrating the principle usually comprises a globe, a photoelectric device, a mechanical device and the like, can demonstrate revolution and rotation of the earth vividly, but is not outstanding enough in effect of demonstrating change of length of day and night, and is inconvenient for teachers and students to fetch and operate.

At present, a patent 200720030765.5 found by the state intellectual property bureau describes a demonstrator for the variation of day and night length of the earth, which is characterized by simplicity. However, the teaching instrument is not clear enough in some places, for example, the position of the solar direct point is not expressed in place, the moving range of the solar direct point is not limited, and the like.

Disclosure of Invention

To present teaching instrument demonstration length and solar radiation distribute along with the latitude and seasonal variation this principle not enough, design out the utility model discloses a length change demonstrates appearance round clock.

The purpose of the utility model can be realized by the following technical scheme: a demonstrator for variation of length of day and night comprises a round drawing board simulating a side view of a round hemisphere, an arrow simulating sunlight, a central shaft connecting the round drawing board and the sunlight at the center of the circle, and a set of limiting blocks for limiting the moving range of a direct sunlight point. By rotating the chart board, the position of the solar direct point is simulated to move back and forth between the south-north return lines, and the change of the day and night length and the solar radiation distribution of all parts of the earth along with the latitude and the season is demonstrated.

Furthermore, the circle drawing board of the diurnal hemisphere marks teaching important reference lines such as an equator and the like at the positions meeting requirements, and is used for demonstrating a simulated diurnal hemisphere side view of a solar radiation area.

The night hemisphere semicircular drawing board is used for demonstrating the area which is not irradiated by the sun and simulating the side view of the night hemisphere.

The solar ray, the arrow points to the circle center and is vertical to the diameter edge of the night hemisphere semicircle drawing board, so as to simulate the solar ray directly irradiating the earth; the length of the arrow shaft is larger than the radius of the diurnal hemisphere drawing board, so as to demonstrate that the sunlight is irradiated from the extraterrestrial space; the intersection point of the arrow shaft and the edge of the round picture plate of the diurnal hemisphere is used for demonstrating the position of the direct sun-irradiating point.

The center shaft connects the two drawing boards at the circle center, and the two drawing boards can rotate around the center shaft.

The limiting gear can limit the direct solar radiation point to move back and forth between the return-to-return lines of south and north.

Furthermore, by rotating the drawing board, the position movement of the direct sun point is observed, and the change of the four seasons of spring, summer, autumn and winter can be demonstrated.

By observing the change of the white area of the earth, the phenomena that the solar radiation area changes along with time, the seasons of the north and south hemispheres are opposite and the like can be demonstrated.

By observing the length ratio of each weft in the white and black area, the length of day and night at the position of the weft and the extreme day and night phenomenon near the north and south poles can be judged.

The utility model has the advantages that: the utility model discloses, can demonstrate out with the complicated geographical principle that length and solar radiation distribution change along with latitude and season easily and clearly, make teaching key points such as direct sunlight position, round clock hemisphere, length and change round clock and solar radiation distribution very directly perceived and outstanding, be convenient for the student to understand and accept, break through teaching key point better; simple structure, low cost, convenient teachers and students carry and operate and demonstrate in classrooms.

Drawings

Fig. 1 is a front view of the overall structure of the present invention.

Fig. 2 is a side view of the overall structure of the present invention.

Fig. 3 is a reverse side view of the overall structure of the present invention.

Fig. 4 is a schematic view of the night hemisphere semicircle drawing board and the sun ray of the present invention.

Fig. 5 is a schematic view of a round drawing board of the diurnal hemisphere of the present invention.

Description of reference numerals: 1. a round drawing board of the hemispherical daytime; 2. a night hemisphere semicircular drawing board; 3. solar rays; 31. a light head; 311. an arrow; a 32-arrow shaft; 33. a point of direct solar radiation; 4. a middle shaft; 41. a middle shaft hole; 51. a stopper rod; 52. and (4) limiting gears.

Detailed Description

The following describes in detail an embodiment of a day-night length variation demonstration apparatus according to the present invention with reference to fig. 1 to 5.

A day and night length change demonstration instrument comprises a day hemisphere drawing board 1 simulating a day hemisphere side view, a night hemisphere drawing board 2 simulating a night hemisphere side view, an arrow simulating sunlight 3, a center shaft 4 connecting the day and night drawing board and the sunlight at the circle center, a limiting rod 51 and two limiting baffles 52.

Furthermore, the round drawing board 1 is a round panel, and the bottom color is white. The equator, the south-north return line, the south-north polar circle, the south-north polar point, the south-north latitude 30 degrees, the south-north latitude 60 degrees and the earth axis are marked at the positions meeting the requirements, and the marks are important reference lines in teaching demonstration. The effect is to demonstrate the solar radiation area, simulating the diurnal hemisphere side view.

Furthermore, the night hemisphere semicircular drawing board 2 is a semicircular panel, and the bottom color is black. The morning and evening lines are marked at the diameter edges. The effect is to demonstrate the area not irradiated by the sun, simulating the night hemisphere side view.

Further, the solar ray 3 includes a ray head 31, an arrow shaft 32 and a direct solar point 33. The sun ray 3 and the night hemisphere semicircle drawing board 2 are made into a whole in the embodiment, and the light head 31 at the joint of the sun ray and the night hemisphere is made into a small square, so as to facilitate drawing the arrow 311 and drilling the center shaft hole 41 at the center of the circle, increase the firmness of the instrument and make the instrument not easy to deform.

The sunlight 3 is perpendicular to the diameter side of the night hemisphere semicircular drawing board 2 and used for simulating the sunlight which directly irradiates the earth, and the length of the sunlight is larger than the radius of the night hemisphere semicircular drawing board 1 and used for demonstrating that the sunlight irradiates from the space outside the earth.

The direct sun-shooting point 33 is located at the intersection of the arrow shaft 32 and the edge of the round picture board 1 of the diurnal hemisphere, and the arrow shaft 32 is marked in a coloring mode to demonstrate the position of the direct sun-shooting point.

The arrow 311 and the arrow shaft 32 of the solar ray 3 are colored red, and the direct solar ray 33 is colored yellow. The other preferred embodiment mode is as follows: arrow 311 and arrow shaft 32 are yellow, and the direct sun point 33 is red. The purpose is to demonstrate the effect of 'red sun' or 'golden sun'.

The light head 31, the small square panel except the arrow 311, is colored white, is in the same color as the diurnal hemisphere circular plate 1, demonstrates the solar radiation area with the diurnal hemisphere circular plate 1, and simulates a diurnal hemisphere side view.

Furthermore, a central shaft hole 41 is drilled at the circle center of the round drawing board 1 of the day hemisphere and the round drawing board 2 of the night hemisphere, the round drawing board 2 of the night hemisphere is arranged above, the round drawing board 1 of the day hemisphere is arranged below, and the two boards are connected by a central shaft 4. The central shaft 4 can be screwed or riveted.

Further, the stopper rod 51 is formed of

And the width of the arrow shaft 32 is the same as that of the arrow shaft, and the top of the arrow shaft 32 is firmly bonded. Another advantage of the design is that the arrow shaft 32 is fastened with the round drawing board 1 of the diurnal hemisphere, thereby increasing the firmness of the utility model.

Two limiting stops 52 are arranged at proper positions on the reverse side of the round picture board 1 of the round hemisphere, or the round or square is not limited, and the round picture board is firmly fixed with the round picture board of the round hemisphere. When the direct solar point 33 moves to the return-to-south line, the limiting gear 52 limits the limiting rod 51 to continue moving, so as to limit the moving range of the direct solar point 33 between the return-to-north lines.

Furthermore, by rotating the drawing board, the movement of the position of the direct solar radiation point 33 can be observed, and the change of the four seasons of spring, summer, autumn and winter can be demonstrated.

Claims

1. A day and night length change demonstration instrument is characterized by comprising a circle drawing board simulating a side view of a day hemisphere, a circle drawing board simulating a side view of a night hemisphere, an arrow simulating sunlight, a center shaft connecting the day and night drawing board and the sunlight at the center of a circle, and a group of limiting stops limiting the moving range of a direct sunlight point.

2. The apparatus as claimed in claim 1, wherein the night hemisphere drawing board is semicircular and the background color is black; the drawing board of the day hemisphere is round, and the bottom color is white; the night hemisphere and the day hemisphere are respectively arranged on the upper part and the lower part and are connected at the circle center by a central shaft, and the two panels can rotate.

3. The apparatus as claimed in claim 1, wherein the night hemisphere drawing board is integrated with the sun's rays, and the junction is square.

4. The apparatus as claimed in claim 1, wherein the length of the arrow shaft simulating the sun is longer than the radius of the hemispherical plate.

5. The apparatus as claimed in claim 1, wherein the arrow shaft and the arrow shaft are colored red at their bottom, and yellow at the intersection with the edge of the round drawing board of the diurnal hemisphere; the other coloring scheme is that the bottom color of the arrow and the arrow shaft is yellow, and the arrow shaft at the intersection point of the arrow shaft and the edge of the picture board of the diurnal hemisphere is colored red.

6. The circadian length variation demonstrator of claim 1, wherein the set of motion limiting gears comprises a motion limiting rod and two motion limiting gears; the limiting rod is

The top part of the arrow shaft is fixed on the reverse side of the arrow shaft; two limiting baffles are fixed on the back surface of the daytime hemisphere drawing board.