A batch of ball mill girth gears recently finished hobbing at Shenyang Sanland Mining Engineering Co., Ltd. While gear blanks are still being cut in the workshop, the finished-goods area holds rows of girth gears, pinions and bevel gears, with common specifications kept in stock. From blank to finished part, Sanland's gear components are all produced within its own system.

The girth gear and pinion are key parts of the drive system of ball mills, rotary kilns and similar equipment, transmitting rotation to the mill shell. Meshing accuracy directly affects running stability and gear life: pitch errors or excessive runout lead to vibration and noise at best, and pitting or tooth breakage at worst, so gear manufacturing demands tight accuracy control.

Sanland gear components start from forged or cast steel blanks, which are inspected, rough turned and quenched and tempered before hobbing. Each finished gear is inspected against the applicable standard, with ring gear runout, pitch deviation, base pitch deviation and backlash allowance recorded item by item. The girth gear for the 1800 series ball mill, for example, has a module of 16 and 151 teeth at quality grade 9-9-8-De.

Besides build-to-drawing production, Sanland keeps batch stock of common gear specifications. Girth gears, pinions and bevel gears of various sizes are normally available in the finished-goods area, allowing quick supply after orders are placed; non-standard gears and parts for mill upgrades can also be developed from customer drawings.

Shenyang Sanland Mining Engineering Co., Ltd. specializes in the manufacturing of crushing, screening and grinding equipment. With main machines and core spare parts produced in-house, the company provides complete support, from complete machines to spare parts, for mining and aggregate projects at home and abroad.

www.sanmining.com

kimosales@sanlandmet.com

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