HYDRAULIC EQUIPMENT FOR DRIVING HYDRAULIC ROLLING-DOWN CYLINDER OF STAND CHANGING TYPE ROLLING MILL

摘要

PROBLEM TO BE SOLVED: To clean a hydraulic rolling-down equipment of a stand type rolling mill. SOLUTION: Relating to a stand changing type rolling mill whose inner stand 1 is arranged inside an outer housing 29 and which is provided with a pair of upper and lower horizontal rolls, a pair of right and left vertical rolls 3a, 3b and hydraulic equipment for driving the axial center positions of the respective rolls with a hydraulic rolling-down cylinders 4, on the hydraulic piping of the hydraulic equipment for driving the hydraulic rolling-down cylinders which are arranged in the rolling mill, a pair of directional control valves 10, 11 are arranged, an oil cleaning mechanism in which a filter 12 is provided between these directional control valves is arranged and hydraulic servo valves 8 are provided on the hydraulic piping in the vicinity of the hydraulic rolling-down cylinders 4.