Chalk anti-breaking device for middle school mathematics teaching

Abstract

The invention provides a chalk anti-breaking device for middle school mathematics teaching, and belongs to the technical field of teaching tools. The device comprises a sleeve, a fixing unit and an adjusting device. The adjusting device comprises an arc control plate, a transmission rod, a linear guide rail and an arc-shaped guide rail; a plurality of triangular positioning teeth are arranged on the arc-shaped guide rail; the fixing unit comprises a base, a spring and a fixing sleeve; the fixing sleeve is fixed on the base; a positioning sheet matched with the triangular positioning teeth is integrally arranged on the base; and the bottom of the spring is fixed on the sleeve, and the top of the spring is fixed on the base. According to the design, the problem of breakage of chalk in the blackboard writing process can be effectively prevented, the writing smoothness is improved, and the problem of use loss caused by breakage of the chalk is reduced; the writing stability is ensured, and joint injury to fingers of a user due to sudden breakage of the chalk is effectively avoided; and the extension length of the chalk can be rapidly adjusted, operation is easy, and use is convenient.

Description

technical field [0001] The invention relates to the technical field of teaching tools, in particular to a chalk breaking prevention device for middle school mathematics teaching. Background technique [0002] At present, in the middle school mathematics teaching process, it is often necessary to use chalk to write a large number of formulas; during the writing process, the chalk often breaks suddenly, which affects the fluency of writing, and the moment the chalk breaks has a greater impact on the writer's finger joints , affect the health of the finger joints; most of the existing chalk anti-breaking devices are cylindrical structures, and the chalk is loaded into the device. Although the chalk can be broken in an effective way, the adjustment of the protruding length of the chalk is troublesome, and the installation and operation of the chalk are not easy. Convenience, use effect is not good. Contents of the invention [0003] In view of the above-mentioned technical de...

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Problems solved by technology

[0002] At present, in the middle school mathematics teaching process, it is often necessary to use chalk to write a large number of formulas; during the writing process, the chalk often breaks suddenly, which affects the fluency of writing, and the moment the chalk breaks has a greater impact on the writer's finger joints , affect the health of the finger joints; most of the existing chalk anti-breaking devices are cylindrical structures, and the chalk is loaded into the device. Although the chalk can be broken in an effective way, the adjustment of the protruding length of the chalk is troublesome, and the installation and operation of the chalk are not easy. Convenience, use effect is not good

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