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

CN111653161AInactive Publication Date: 2020-09-11CHONGQING UNIV OF EDUCATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-09-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention belongs to the field of primary school mathematics teaching appliances. The invention particularly relates to a cone volume formula derivation demonstration device for primary school mathematics teaching. The device includes a base, a turntable is arranged at the upper end of the base; a bolt is sleeved in the turntable in a sliding manner; a bolt is slidably sleeved with the base, acountersunk groove is formed in the lower end of the base, the lower end of the bolt is connected with a nut through a thread, the outer side of the bolt is slidably sleeved with a pressure spring, an annular groove is formed in the upper end of the base, steel balls are arranged in the annular groove, and the upper ends of the steel balls are in contact connection with a turntable. The turntableis arranged at the upper end of the base, the turntable and the base are connected in a matched mode through the bolt and the nut, the annular groove is formed in the base, and the steel balls are arranged in the annular groove, so that the whole structure at the upper end of the turntable can rotate relative to the base, students at all positions can be demonstrated more conveniently, and the teaching quality is better.
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Description

technical field

[0001] The invention relates to the technical field of primary school mathematics teaching appliances, in particular to a cone volume formula derivation demonstration device for primary school mathematics teaching. Background technique

[0002] The volume formula of a cone is a commonly used formula for calculating volume in primary and secondary school mathematics and physics. Although students can better understand the concept of the volume of a cone, the calculation of its volume is too abstract, especially the volume of a cone is one-third of the volume of a cylinder with the same base and height. The reasoning of this formula is quite difficult , so the knowledge about the volume of a cone often becomes a blind spot and a difficult point for students, and students only memorize this formula by rote, but they don't know why, and it is easy to remember it wrongly or not remember it.

[0003] In the prior art, the cone volume formula derivation demonstrati...

Examples

Embodiment

[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...