Integrated side drive - Mill Gear Drive Solution

The LGD gearbox from MAAG is designed with the state of the art technique, i.e. torque-split pinions and self-aligning pinions.  Further the LGD is positioned 40 deg. under the mill. This design results in the following advantages:

• low foundation design, i.e. compact mill arrangement
• low risk of vibration in the gear unit foundation
• Easy access for service and maintenance
• Direct lube oil return from the girth gear into the integrated lube oil tank minimum oil flow in the girth gear guard, i.e. minimum contamination of the lube oil

The LGD mill drive design is based on MAAG's high quality gear manufacturing expertise acquired during the last 85 years, and on experiences from operation of existing integrated side drives forming an ideal basis for design and manufacturing of a competitive and high-quality integrated side drive.

The torque-split between the two pinions secures that the total torque from the mill is always equally distributed to both pinions. Any deviations in torque between the two pinions will automatically be equalized by axial adjustment of the intermediate shaft caused by the deviations in the
axial forces.

Self-alignment of the pinions is achieved by a crowned toothing between the pinion and the pinion shaft. This secures full tooth contact also at a smaller run out of the girth gear.

The LGD is positioned 40 deg. under the mill. This feature requires a very low foundation for the LGD gearbox and the motor resulting in a very compact overall mill arrangement.

The low and simple LGD foundation minimizes the risk of critical vibrations in the foundation.

With the LGD gearbox positioned partly below the mill it is possible to return the lubrication oil directly from the girth gear guard to the gearbox. This is utilized to make the LGD drive with the oil-sump in the bottom of the gearbox and a separate lubrication unit with foundation is avoided. Because the oil-pump, -filter, and -cooler, etc. is installed directly on the LGD gearbox external piping between gearbox and lubrication station is also avoided.

Most of the oil for lubrication of bearings and tooth meshes is circulating inside the gearbox only. The oil-flow is optimized to keep the risk of contamination of the oil as small as possible.

The LGD gearbox is installed by sliding or by lifting the gearbox from a truck onto the foundation followed by horizontal adjustment by tackles to correct mesh with the girth gear on the mill. No (mobile) crane is needed if the height of the truck is about as high as the gear foundation.

Access for service and maintenance is very comfortable. To remove the gearbox from the foundation for replacement of rotating parts no crane is necessary because it is possible to pull it out by means of tackles.

The LGD gear drives are adapted to the standard range of the ball mills by a set of girth gears and girth gear guards. The combination between the different mill sizes and drive sizes is illustrated below. The diagram is applicable for the most usual mill configurations, i.e. mills with two compartments and approximately 30% of the power in the first compartment.

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