7.2 Roller Press
Wit h Roller Presses, the grinding pressure is transferred from the hydraulic system
via the movable roll to the material bed and absorbed in a stable, closed machine
frame. A key feature is the mounting of the rollers in grease lubricated cylindrical
- thrust roller bearings / spherical roller bearing. The grease is both, lubricant and
cooling agent. Alternatively, oil lubrication is also possible. Power transmission
from the electric motors is effected via cordon shaft, fluid or safe set coupling and
clamping disc fitted with gear boxes, usually of planetary design. Depending on the
application, the rollers are either one-piece solid construction or shaft and tire
design with suitable wear protection for almost all applications in the cement and
minerals industry. Generally, these presses are utilized in conjunction with ball mill
for combi grinding for Clinker grinding. The broad construction features of Roller
Press are as shown in Fig.2 below
- Additional Design considerations for selection of Roller Press:
Bearing Safety Factor - Bearings for Roller Press shall have safety factor on
dynamic load of min. 3.0 times on combined load for oil lubricated bearings
and min. 3.5 times in case of grease lubricated. Bearing Housing should be
with labyrinth seal.
Roller Press Reject recirculation circuit shall be designed by minimum 3.5
times of potential capacity