Normally the grinding rollers will stay inside the ATOX mill several years until removal is required – typically because of preventive replacement of bearings or because there are initial signs of bearing deterioration, which requires roller replacement.
The rail and hoist system on all large ATOX mills provides a relatively simple way to remove the roller. With the maintenance door removed, the rail is bolted to the mill housing; for Atox 47.5-50, it is bolted to the support outside the mill.
In case the grinding roller opposite the door needs removal, the entire roller assembly is rotated on the grinding table while turning the main gear manually or by means of a maintenance drive.
Easy operation
The ATOX mill provides optimum operation for all kinds of raw material mixes and ensures a uniform product dried to the correct level. Adapting to different conditions is easy. Simply utilise the included facilities for dam ring adjustment (grinding bed control) by installing ring segments of varying thickness.
To give the lowest pressure drop across the mill – making it possible to operate with a controlled amount of re-circulated material – the mill nozzle ring area can be adjusted by means of shims. Optimising these conditions results in the lowest fan power consumption.
The hydraulic system for grinding pressure has been designed for operational flexibility. Grinding pressure can be varied over a wide range, making it possible to minimise the mill vibration level during operation.
The mill is equipped with a water injection system to improve the grinding conditions, should this be required due to dry or unstable raw materials. The water flow rate can be adjusted from the control system in a step-less mode.
To ensure easy and reliable operation, the FLSmidth automation control system offers several possibilities for control and surveillance. Several facilities can be useful in setting up the grinding system for the best and most energyefficient operation.
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Roller removal and easy operation of ATOX mill
Roller removal of vertical roller mill
Normally the grinding rollers will stay inside the ATOX mill several years until removal is required – typically because of preventive replacement of bearings or because there are initial signs of bearing deterioration, which requires roller replacement.
The rail and hoist system on all large ATOX mills provides a relatively simple way to remove the roller. With the maintenance door removed, the rail is bolted to the mill housing; for Atox 47.5-50, it is bolted to the support outside the mill.
In case the grinding roller opposite the door needs removal, the entire roller assembly is rotated on the grinding table while turning the main gear manually or by means of a maintenance drive.
Easy operation
The ATOX mill provides optimum operation for all kinds of raw material mixes and ensures a uniform product dried to the correct level. Adapting to different conditions is easy. Simply utilise the included facilities for dam ring adjustment (grinding bed control) by installing ring segments of varying thickness.
To give the lowest pressure drop across the mill – making it possible to operate with a controlled amount of re-circulated material – the mill nozzle ring area can be adjusted by means of shims. Optimising these conditions results in the lowest fan power consumption.
The hydraulic system for grinding pressure has been designed for operational flexibility. Grinding pressure can be varied over a wide range, making it possible to minimise the mill vibration level during operation.
The mill is equipped with a water injection system to improve the grinding conditions, should this be required due to dry or unstable raw materials. The water flow rate can be adjusted from the control system in a step-less mode.
To ensure easy and reliable operation, the FLSmidth automation control system offers several possibilities for control and surveillance. Several facilities can be useful in setting up the grinding system for the best and most energyefficient operation.