Mechanical demonstration device

The invention discloses a mechanical demonstration device in the field of mechanical teaching aids. The device comprises two connecting rods, two connecting pieces, a stressed component and a bearing,wherein a plurality of support plates are arranged on the bearing side by side; slide rods are arranged on the two sides of the bearing; pulleys are arranged on the slide rods and connected with theslide rods in a sliding manner; the stressed component comprises a steel plate and a plurality of steel sheets; the steel sheets are uniformly distributed on the steel plate and are perpendicular to the steel plate; through holes are uniformly distributed in the steel plate and located between the adjacent steel sheets; the connecting pieces comprise vertical rods and horizontal rods; the verticalrods are articulated with the horizontal rods; the steel plate is detachably connected between the two connecting rods and the vertical rods; a steel plate is detachably connected between the two horizontal rods; and one end,