Cone volume formula derivation demonstration device for primary school mathematics teaching
A technology of a demonstration device and a cone, which is applied to the field of a demonstration device for deriving the volume of a cone for mathematics teaching in elementary schools, can solve the problems of inconvenience for students to watch, inability to sequentially enter the water into a cylindrical bottle, and inconvenience for continuous multiple demonstrations, etc., so as to achieve convenient and rapid flipping. Adjustment, easy to understand, good teaching quality
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[0028] see figure 1 , image 3 , Figure 6 , a cone volume formula derivation demonstration device for elementary school mathematics teaching, comprising a base 1, a turntable 2 is arranged on the upper end of the base 1, a bolt 3 is slidably socketed in the turntable 2, and a bolt 3 is slidably socketed in the base 1, and the base 1 The lower end is provided with a countersunk groove 4, which is used to hide the nut 5, so that the base 1 is more stable, the lower end of the bolt 3 is connected with the nut 5 through threads, the outer side of the bolt 3 is slidingly sleeved with a compression spring 6, and the upper end of the base 1 is provided with Annular groove 8, steel ball 9 is arranged in annular groove 8, the upper end of steel ball 9 is connected with turntable 2, and the rotation of turntable 2 is not easy to produce jam through the cooperation of annular groove 8 and steel ball 9, and the upper end of turntable 2 is welded with side plate 10 , the side plate 10 i...
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