Cam profile curve plotting demonstration instrument

Abstract

The invention discloses a cam profile curve plotting demonstration instrument. The instrument comprises a machine frame, an outer shaft, an inner shaft and a drawing board, wherein the drawing board is arranged on the front side of the machine frame, a cross-shaped support is arranged between the drawing board and the machine frame, a bottom shaft is installed on the lower portion of the machine frame, a bottom shaft gear is installed on the bottom shaft, the outer shaft penetrates through the front side of the machine frame and the cross-shaped support and is connected with the machine frame, an outer shaft gear is installed on the outer shaft and is meshed with the bottom shaft gear, the inner shaft is connected with the outer shaft in a rotary mode, the rear end of the inner shaft is connected with the machine frame, the drawing board is installed at the front end of the inner shaft, a central gear is installed on the portion, between the drawing board and the cross-shaped support, of the inner shaft, a driven part is arranged on the upper portion of the front side of the cross-shaped support, a drawing pen is arranged on the front side of the lower portion of the driven part, a pin is fixed to the lower portion of the driven part, a rack plate is arranged between the driven part and the cross-shaped support, a cam slot is formed in the rack plate, the pin penetrates through the cam groove, and the rack plate is meshed with the central gear. The cam profile curve plotting demonstration instrument not only can be used for demonstrating cam profile curve plotting through the reversal process, but also can be used for demonstrating the movement of an original mechanism before reversal.

Description

Technical field [0001] The invention relates to a teaching demonstration instrument, in particular to a cam contour curve drawing demonstration instrument. Background technique [0002] In the course of "Mechanical Principles", the content of the reversal method to design the cam profile curve is relatively abstract. When teachers explain, they only use two methods: drawing on the blackboard and verbal description. It is not easy to explain clearly, and it is not easy for many students to understand deeply. In order to accurately and quickly understand the principle of the cam profile curve designed by the reversal method, it is necessary to have a vivid, specific and intuitive understanding of the movement of the cam mechanism after changing the frame. However, the mechanism motion diagram drawn on the blackboard is static. Teachers often spend a lot of time and energy explaining from various angles. Students must use imagination to move the static mechanism motion diagram. Th...

AI Technical Summary

Problems solved by technology

At present, among the teaching aids related to the cam mechanism, although some can demonstrate the motion of the cam mechanism, they cannot demonstrate the reverse method to draw the cam contour curve, and students still cannot understand the reverse method to draw the cam contour curve well.

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