GRINDING MILLS MAY USE THREE PRINCIPLES OF PARTICLE SIZE REDUCTION :

• CRUSHING

• ATTRITION

• IMPACT

CLASSIFICATION IN TERMS OF SPEED,TYPE & OPERATING PRINCIPLE:

Low

10 to 20 RPM Speed Medium

40 to 70 RPM

High

900 TO 1000 RPM

Ball Tube Mill

Type Ring Roll Mill

Ball and Race Mill

Bowl Mill

Impact or Hammer Mill

Attrition Predominant

Principle

Crushing Impact

BOWL MILL :

• Medium speed vertical mill (40-70 RPM)

• Conical Grinding rolls 3no.s per mill

• The Race will be either deep or shallow like saucer covered with liner called Bullring segment • The Bowl is rotated by a Gearbox have reducing gear like Worm gear set or Bevel helical gears

WORM SHAFT

AC MOTOR

BULLRING &ROLLER ASSEMBLY

PRESSURE SPRING

SEPARATOR TOP

DEFLECTOR REGULATOR

OIL COOLER

NOMENCLATURE:583 XRS / 803 XRP Bowl Mills 58,80 Stands for Bowl diameter in inches.

If the number is even then its Shallow Bowl Mill.

3-Number of Rollers X- Frequency of Power supply (50 cycles). R- Raymond Name of the inventor S- Suction type with Exhauster after mill P- pressurized type with P.A. FAN before mill

If the number is odd then its Deep Bowl Mill.

RANGE:BHEL manufactures Bowl Mills in the followingRanges (corresponding to Bowl diameter in inches):

• 60" Series : 583, 603 & 623 XRP/XRS• 66" Series : 663 XRP• 70" Series : 703 XRP, • 80" Series : 763, 783,803 XRP, • 90" Series : 883 XRP • 100"Series : 1003 XRP

MANUFACTURING BASE CAPACITY RANGE :

MILL TYPE BASE CAPACITY

703 XRP 26.4

763 XRP 33.8

783 XRP 36.5

803 XRP 39.8

883 XRP 51.1

903 XRP 54.1

1003 XRP 68.1

1043 XRP 72.0

THANK YOU .