Heavy duty pulley

High quality seamless steel pipes or steel plates are usually used for rolling and welding, and the wall thickness is designed according to the load (heavy-duty can reach 20-60mm)

Material: Forged alloy steel 42CrMo4, material certificate shall be provided. Heat treatment: Quenched and tempered (Q&T) as a whole, to meet requirements of strength, toughness and low-temperature impact property.

NDT: Ultrasonic testing (UT) for the forging; magnetic particle testing (MT) on shaft journals, transition fillets and other stress-concentrated areas, free from cracks, white spots, inclusions and other defects.

Machining: Precision machining on shaft journals, bearing fitting surfaces and hub fitting surfaces. Dimensional tolerances and geometric tolerances shall comply with drawing requirements. Smooth transition fillets to avoid stress concentration.

Calculation: Strength and stiffness checked under normal load plus impact load. Low-temperature impact toughness guaranteed for cold service conditions to prevent brittle fracture.

Including bearings, seals, and seats, multiple labyrinth seals are required for heavy working conditions

Connecting components such as locking assemblies and key joints are used to guarantee reliable torque transmission between the shaft and pulley shell.

Cold bonding, hot vulcanization lagging or ceramic lagging, thickness 8–20 mm. It increases the friction coefficient, prevents material adhesion and protects the conveyor belt.