- Although the paint roller is a small part in the belt conveyor and the structure is not complicated, it is not easy to manufacture the roller.There are several criteria for judging the quality of the idler: the amount of radial runout of the idler; the flexibility of the idler; the amount of axial movement.Roller classification:1. According to the material, it is divided into rubber roller, ceramic roller, nylon roller and insulating roller.2. There are mainly trough roller groups, various parallel roller groups, various self-aligning roller groups, and various buffer roller groups.(1) Groove idlers include ordinary idlers, forward inclined idlers, quick-change bearing idlers, hanging idlers, triple chain idlers, reversible idlers, variable groove angle idlers, and transitional idlers Roller, V-shaped roller, etc.;(2) Parallel rollers include ordinary rollers, comb rollers, forward tilt rollers, steel rubber rollers, spiral rollers, etc.;(3) Self-aligning rollers include universal rollers, friction reversible rollers, roller rollers, cone rollers, spiral rollers, combined rollers, etc.;(4) Buffer rollers include spring plate rollers, buffer ring rollers, buffer rollers, adjustable elastic rollers, hanging rollers, etc.;The paint roller is mainly used to optimize the surface quality of metal or plastic workpieces. The paint is sprayed into a mist through high air pressure, and the electrostatic adsorption is used to make it uniformly adsorbed on the surface of the workpiece and solidify, so as to achieve beautiful appearance, etc. purpose.