SIMCOs builds a complete line of magnetic pulleys for removal of tramp iron in bulk materials on conveyor belts. Magnetic fields are designed to provide full magnetic penetration of burdens carried on conveyors in normal operation,. The following procedures will enable you to select the right pulley.
Three factors must be known ; width of conveyor belt, speed of belt in meter per minute and capacity in cubic meter per hour. With the known factors, the required pulley size can be selected directly from Table 1. using the outlined procedure that applies to your conveyor system.

FOR NORMAL SEPARATION

1. Select belt width column, in Table 1. This will be pulley width.
2. In width column, locate capacity equal or next larger than required. Horizontal reference in first column indicates diameter required.
3. For best separation, belt speed should not exceed recommended speed indicated in last column for size pulley selected.

EXAMPLE :
1200 mm width conveyor belt
Capacity : 930 cu. mt per hr.
Selected pulley size :
900 mm dia. x 1200 mm width
Belt speed : 110 m/min.

FOR FASTER BELT SPEEDS

1. Determine difference in mpm between required belt speed and recommended speed of size selected.
2. Add 1/2 of difference to recommended speed to obtain corrected speed factor.
3. Diameter of pulley will correspond to this factor.

EXAMPLE :
1200mm width conveyor belt
Capacity : 930 cu. mt per hr.
Required speed : 130 m/min.
Recommended speed for 900 mm dia. pulley : 110 m/m.
130 - 110 = 20 ;
110 + 20/2 = 120 corrected speed
A 1050 mm dia. pulley should be used.

FOR INCLINED CONVEYOR

Belt convetors inclined upward on the approach to the magnetic head pulley can be operated at faster belt speeds and increased capacities. The table below gives correction factors to be used with Table I in selecting correct size of pulley.
 

1. Multiply capacity in cu. mt. per hr. by correction factor for degree of inclination to obtain corrected capacity factor.
2. Multiply required belt speed by correction factor for degrees of inclination to obtain corrected speed factor.
3. Using corrected factors for capacity and speed, select required pulley size according to the procedures outlined above.

EXAMPLE :
1200 mm width conveyor belt
Capacity : 930 cu. mt. per hr.
Required speed : 130 m/min.
Conveyor inclination : 15°
.865 x 930 = 804.45 corrected capacity factor
.865 x 130 = 112.45 corrected speed factor
Selected pulley dia. : 750 mm recommended
speed : 100 m/min.
(112.45-100) ÷ 2 + 100 = 106.225
A 900 mm dia. pulley should be used.

TABLE 1. CAPACITIES OF SIMCO'S MAGNETIC PULLEY IN CU. MT. PER HR. FOR TRAMP IRON REMOVAL ON NORMAL CONVEYOR OPERATION