Instrument used for demonstrating cam mechanism counter-rotating method design principle and drawing contour lines

The utility model discloses an instrument used for demonstrating the cam mechanism counter-rotating method design principle and drawing contour lines. The cam mechanism counter-rotating method design principle can be visually demonstrated, the contour of a cam can be drew, and students can know, understand and remember the theory easily. The instrument comprises a frame, a rotating mechanism, a demonstrating and drawing mechanism and a controller; a first steering control motor, a second steering control motor, a first transmission shaft and a second transmission shaft are installed on the frame; the first transmission shaft and the second transmission shaft have the same axis, the output shaft of the first steering control motor is connected with the first transmission shaft, the first transmission shaft is fixedly connected with a synchronous rotating disk, the second steering control motor is fixedly connected with the synchronous rotating disk, the output shaft of the second steering control motor is connected with the second transmission shaft, and the second transmission shaft is provided with a disk cam; and a drawing board is fixedly arranged on the frame, a lifting linear motor is eccentrically and fixedly installed on the synchronous rotating disk through a guide rail bracket, the lifting linear motor drives a push rod, and the end portion of the push rod is fixedly connected with a drawing pen.