Raw mill bucket elevator maintenance
Raw mill bucket elevator
1- The bearings at the driven sprocket are damaged.
2- The shafts of the driven sprockets have a sever wear.
3- The new sprocket shafts for the driven sprockets have no groove for circlip which locate the bearing in its position.
4- The free bearing of the drive sprockets has clearance 7 mm.
5- The fixed bearing of the drive sprockets has clearance 1 mm.
6- The drive shaft has an axial movement towards the free bearing.
7- There is high leakage from the oil seal of the low speed shaft.
8- The most of the bolts that connect the buckets and the chain links are loose.
9- The drive unit is fixed by welding a strip plate between the drive unit and its base so the torque arm has been canceled.
1- Replace the driven sprocket, the bearings and seals.
2- The new bearings of the driven sprocket should be located with a circlip.
3- Replace the free and fixed bearings of the drive sprocket
4- Check the shaft for wear due to axial movement
5- Replace the oil seal of the low speed shaft for the main drive gear box.
6- Remove the drive unit fixation.
7- Replace all loose bolts which fix the buckets with the chain links.
8- Check the all buckets and links, and replace the defected.
Action has been taken:
1- The driven sprocket with shafts, bearings and seals has been replaced.
2- The new bearings have been located with a spacer instead of the circlip and this is an accepted solution, but the circlip groove should be machined in the spare sprocket.
3- Only the free bearing has been replaced
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