Plummer Blocks
Layout
Bearings are usually mounted onto pulley shafts at pre-defined spacings, which is the norm followed in the industry.
Factors which affect the bearing centers include the width of the conveyor belt and hence pulley shell, the width of the (discharge) chute work, the design of the pulley support structure and whether or not the pulley is a take-up pulley, tail pulley or drive pulley.
The standard bearing spacing followed is as per the table below :-
Belt width Face width Chute plates I/S Bearing centres Clearances for wide centres
See legend belowWide Narrow W F A B C D E G 450 550 650 1000 760 225 50 50 500 600 700 1050 810 225 50 50 600 700 800 1150 1020 225 50 50 750 900 1000 1350 1170 225 75 50 900 1050 1150 1550 1370 250 75 50 1050 1200 1300 1700 1520 250 75 50 1200 1350 1450 1850 1680 250 75 50 1350 1500 1600 2050 1830 275 75 50 1500 1700 1850 2300 1980 300 100 75 1650 1850 2000 2450 2130 300 100 75 1800 2000 2150 2600 2280 300 100 75 2100 2300 2450 2900 2580 300 100 75 2400 2600 2750 3200 2880 300 100 75 Legend :-
D = Pulley face to centre-line bearing housing.
E = Pulley face to belt edge.
G = Pulley face to inside chute plate.