Belt circular constant calculating scale

The utility model relates to a teaching aid especially relates to a belt circular constant calculating scale. Including the base, sets up pole setting on the base perpendicularly, fixed mounting is the rectangular platy structure of setting perpendicularly at the backplate on pole setting top, backplate, installs the carousel through the pivot on the backplate, and the edge connection of carousel has a steel band, and the scale is installed to the end of steel band, the pole setting upper band has the scale that is used for measurment scale displacement. Its simple structure, reasonable in design, each numerical value of ability reflection directly perceived makes things convenient for mr to demonstrate, can deepen student's understanding moreover to student's interest in learning has been improved. 本实用新型涉及种教学用具，尤其涉及种带式圆周率计算尺。包括底座、垂直设置在底座上的立杆，固定安装在立杆顶端的背板，背板是垂直设置的矩形板状结构，背板上通过转轴安装有转盘，转盘的边缘连接有钢带，钢带的末端安装有标尺，所述立杆上带有用于测量标尺移动距离的刻度。其结构简单，设计合理，能直观反映各个数值，方便老师演示，而且能加深学生的理解，从而提高了学生的学习兴趣。