A large steel recoiler OEM needed a custom gearbox for use on a new steel pickling line recoiler. The drive is direct-coupled to a 125HP electric motor that winds up a 52″ wide, 60,000 lb. steel coil after it passes through the pickling treatment line. The OEM contacted Nuttall Gear based on previous successful drive projects. Nuttall engineers designed a custom gearbox incorporating a customer-supplied low speed shaft that operates a mandrel that expands and contracts to grip and release the coil core.
The gearbox features a custom fabricated steel housing designed in an ‘L’ shape to accommodate required over-sized bearings. The drive utilises through hardened gearing with a reduction ratio of 15.5:1, a 1.2 service factor, 850/2500 RPM input and 55/160 RPM output. A Twiflex MX13 spring-applied, pneumatically released calliper brake was also utilised for parking and holding functionality. The brake is automatically engaged in the event of a power failure. The self-adjusting MX13 brake provides 6.8kN braking force and features asbestos-free, high-friction pad material.