Roof Lifting Cylinder Mill Type Hydraulic Cylinder

Specification: CDH1 MP3, 80mm Bore, 56mm Rod, 660mm Stroke, Plain Clevis Base Mount, Extended Stroke Metallurgical Mill Type Hydraulic Cylinder 

CD Series Cylinder, Differential Mill Cylinder, Round Body Cylinder, Bolted Cylinder, Fast Speed Cylinder

660mm extended stroke with 56mm rod diameter, Euler buckling factor 3.2 at 250 Bar full push force, no rod support bushing required within the stroke envelope for horizontal installations up to 15-degree inclination.

Dual clevis eye configuration — plain clevis at base and rod eye at rod end — provides pure axial load transmission across the pin joints, eliminating side thrust on cylinder tube during angular motion of driven mechanism.

Rod diameter 56mm on 80mm bore gives area ratio 1.96:1, near-symmetric push-pull performance suitable for return-stroke-loaded applications like slab transfer pusher retraction against tilted skid rails.

Cylinder tube seamless ST52 material, single-piece drawn to 660mm length without weld seams, eliminates weld-adjacent softened zones that can distort under extended-stroke thermal cycling in hot mill environments.

Piston mounted with retained nut torqued to 380 Nm plus witness mark, no thread locker required, eliminates fluid contamination risk from anaerobic adhesive breakdown at fluid temperatures above 70 C common in continuous duty applications.

Barrel exterior powder-coated over zinc phosphate primer, salt spray tested 500 hours to ASTM B117, blue RAL 5015 finish resists spatter and mill scale burn-in on hot side installations.

Applied in steel mill slab transfer pusher ram, coke oven door pusher, walking beam furnace lift, continuous casting cut-to-length shear positioning and blast furnace stock rod feeder mechanisms.