Roller Type Standard: Roller classified according to their use of self-aligning roller, buffer roller, roller trough, parallel to the roller. Trough roller generally consists of two side roller and a flat roller composition, groove angle is generally 30 degrees, three roller hinged to each other for removable belt conveyors, trough idlers together, non- metal roller, so called hinged roller. Parallel roller is usually a long roll, non-metallic roller type, which is installed in the pressures at the lower end of it said roller. Roller Technical requirements: roller paint electrostatic spraying technology, non-metallic roller mill, after the first spraying assembly, avoid spraying on seal corrosion; roller using a dedicated pipeline operations. Roller under normal operating conditions life is not less than (three) million hours in the life of the failure rate period should not exceed 5%. After the roller assembly, to conduct sampling, performance testing projects are: dust, water, rotational resistance, axial runout, radial runout and so on.