... a get CE certificationwelding equipment, welding machineself-aligning turning roll, steel structure machinery, weiding rotator, roller stand, ... nucleus rotator, anti-creep rotator, turning roll machine, petrochemical turning rolls, roll machine, painting rotator, rotator, tank welding ... turning-roll can be adjusted by lead screws and bolts grading . Theycan be controlled with AC frequency rnverter ...