Third drum mechanism of slide type automobile drum experiment bench

A third drum mechanism of a slide type automobile drum experiment bench is composed of a third drum assembly, guide limit supports and a cylinder (10). The third drum assembly is composed of an upper arc plate (1), a lower arc plate (1), a left lateral plate (2), a right lateral plate (2) and a third expansion cylinder (3), the guide limit supports are symmetrically arranged on the left and the right and are respectively composed of a bearing, a bearing seat (5), a transverse beam (6), an idler wheel support (7), a guide wheel (8) and a limit wheel (9). Tracks at two ends of the third drum assembly are supported on the guide limit supports and are capable of rotating around the outside of the drum circle vertically under the effect of the cylinder (10). When the third drum mechanism is tested, the third drum mechanism rises to enable a third drum to be contacted with a tire to limit the horizontal position of the tire and have the effect of location and safety protection. When the test is finished, the third drum assembly is retreated downwards to facilitate passing in and out of automobiles.