Phased Array Eddy Current Gear Testing. Phased array eddy current array testing provides coverage of root and load face in one pass and ideally suited for mill and kiln girth gears testing with two probes able to cover most sizes. For smaller gears a flexible probe like a piece of thick vinyl can conform to any gear shape required.
Girth Gear Applications Girth gears fall into two basic categories; flange mounted and tangential spring mounted. Flange-mounted girth gears, the more common of the two, are most frequently utilized in "cold" processing equipment such as SAG (semi autogenous grinding) mills and ball mills for use in the mining and cement industries.
Girth gear drives have been, and continue to be, the primary method of driving SAG mills, Ball mills and other rotating elements. Several thousand grinding mills have been manufactured and have been in operation for the last century. The gearless drive came into the minerals industry in 1980 and as per their reference lists, Siemens
(for SAG mill power, set discharge mechanism to grate - for ball mill power set to overflow). 17. If SAG cyclone is used in actual circuit (scalps final product, with underflow sent to ball mill circuit, then use Bond formula without phantom cyclone adjustment to predict power required by ball mill to produce target p80 size from design criteria.
Girth Gear Industrial Girth Gear and Kiln Girth Gears. We are engaged in manufacturing and supplying Girth Gear, Industrial Girth Gear, Kiln Girth Gears This girth gear is widely demanded in different industries to be installed in different machines such as Rotary Kilns, Rotary Dryers and Ball Mills, girth gear for ball mill, girth gear for cement mill, girth gear for raw mill, girth gear for ...
girth gears or the single-helical SAG mill girth gear from David Brown (England) delivered in 2008 for a mining opera-tion in Armenia. (A gear that weighed more than 65,000 kilograms [143,300,30 lbs] boasted 362 teeth, 0.75 DP, 863.6 mm face width, 12.4m OD and a 10.5 m diameter bore). At that time, David Brown had claimed the size record.
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In short, it is a very clear that a SAG mill ring gear designed for 22.5MW in AGMA 321.05 is more than sufficient for 24MW in AGMA 6014/6114. The cost savings resulted from the revision of standards, averages to a more than 5% per a set of gears. Girth Gear improvements in casting techniques and materials
Elastic mill sag by weight of mill balls and materia! to grind A: After temporary alignment of the teeth of pinion and girth gear with the mill empty, Fig. 8a, re-alignment should be undertaken with the mill filled with mill balls, i. e. with reference to the elastic sag in cold con- dition, Fig. 8b.
The mill drive system consists of the main mill motor, the main reduction gear box, mill pinion and girth gear. The mill is also equipped with a barring drive which is either connected to the main drive reduction unit or alternatively mounted at the back of the main motor. Refer to Figure 2 for a schematic of the mill drive system.
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