general, the bigger the mill diameter, the lower are the mill operating and critical speeds. Thus, for larger mills the number of poles will increase. As a result, the number of poles can vary from 48 to 72 poles (Fig. 3.) with typical mill speed requirements of about 10 rpm for larger SAG mills and about 15 rpm for smaller ball mills. Figure 3.
WhatsApp: +86 18203695377Based on experience, millliner designs have moved toward more openshell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebblecrushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of :1 and :1.
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WhatsApp: +86 18203695377Positioning the access hatch is accomplished by a process known as spotting or inching. Without a dedicated inching system it can be difficult to precisely position the mill, since the technician has no way to accurately and effectively apply torque to the motor directly from the power system.
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WhatsApp: +86 18203695377One of the uses for an inching drive is to slowly rotate a ball mill, as shown here, for inspection or replacement of the inner lining. Image credit: Mauricio Neves, Arnaldo Andrade, and Silva The mounting configuration of an inching drive can be parallel shaft, concentric shaft, or right angle.
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