Cam reverse rotation principle demonstration instrument

Abstract

The invention discloses a cam reverse rotation principle demonstration instrument. A first support and a second support are arranged side by side. An installation plate is arranged on the outer side of the first support, a displacement line drawing board is fixed to the upper portion of the installation plate, LED lamps are installed on the displacement line drawing board, and a stepping motor is installed on a supporting frame and connected with an axle on the outer side of the first support through a coupler. A first guide plate is installed over the installation plate, a first roller shaft is arranged at one end of a first push rod, a first pointer is fixedly installed at the other end of the first push rod, and a driving gear is in meshing connection with a driven gear. A second guide plate is fixed to a center plate of the driven gear, and the outer circle of a second bearing is attached to the periphery of a right cam. The cam reverse rotation principle demonstration instrument not only can demonstrate the design process of the cam profile curve reverse rotation method but also can reflect the movement rule of the push rod of the cam. The real movement state that the cam rotates forwards while the push rod does not move and the hypothetical movement state that the push rod moves while the cam is fixed are compared, the principle of the cam reverse rotation method can be understood clearly, and the movement track of the push rod is shown again.

Description

technical field [0001] The invention relates to teaching equipment for mechanical principles, which is used for a demonstration device of cam motion in mechanical principles, in particular to a demonstrator for the principle of cam reversal. Background technique [0002] The basic principle on which the design of the cam profile is based is the principle of the inversion method. Such as figure 1 As shown, there is a disc cam mechanism with an offset straight-acting pointed pushrod. There is an offset e between the axis of the push rod and the cam rotation axis o. When the cam rotates around the axis o at an angular velocity ω, the push rod realizes the expected movement under the push of the cam. Now imagine adding a common angular velocity -ω to the entire cam mechanism to make it rotate around the axis o. At this time, the relative movement between the cam and the push rod does not change, but the cam will remain still at this time, while the push rod will rotate aroun...

AI Technical Summary

Problems solved by technology

[0003] The principle of the cam reversal method is a very important part of the learning of the cam mechanism in the course of mechanical principles, but at present, it can only be described theoretically in the teaching. Difficult to understand, have great difficulty learning

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