How to stabilize the vertical roller mill material dam ring？

To stabilize the vertical mill grinding table, we must do a good adjustment of dam height , which is the basis of a vertical mill grinding table, the key of vertical mill normal operation . Chaeng will introduce you to describe how to establish stable abrasive bed.

Material thickness can be adjusted to adjust the height of dam, retaining ring material vertical mill is a key component, its role is to maintain a certain level of material grinder, wear ring gauge affects the stable operation of the mill. The correspondence between them and the appropriate thickness and mill output ,the control operator during operation should grasp a clear picture in peacetime. Material layer is too thick to reduce grinding efficiency, the material layer is too thin will cause vibrations. Such as the roll increases, the powder produced much thinner layer of material; rolling reduction, disc material thicker, more appropriate to return the material, the material layer thickens. Mill wind speed increase, increase the internal circulation of material layer thickness, reduce wind speed, reducing the inner loop, the material layer thinning. In continuous production practice, we summed up the thickness of the material bed roller mill via roller compaction control in 50 ~ 60mm is appropriate.
In the control of the operator during the operation should be based on the material layer, feed back, vibration and other parameters to determine gauge ring wear. Under normal operation the mill, the feed amount of 140 t/h, vibration 3.0 mm/s, back to the amount of powder is less than 10t. Once, when the mill after 4000 hours of operation, the amount of powder in the back 60-80 t/h or so, the roller mill vibration value 9 mm/s, vertical mill will gradually reduce the volume of feed to 100 t/h, does not operate normally . Now stop grinding mill hand inspection and measurement, found gauge ring wear serious, the material particles toward the edge of the disc suffered during the resistance becomes small, causing the material to be ground on the disc shorter residence time, back to the amount of powder significantly increased. so the gauge has been worn lap welding repair measures implemented, while the two main rollers, separator blade mill will be open after the vertical mill maintenance, good production, feed mill, the material in equilibrium.  

To gauge ring surfacing, both to improve the service life of ring gauge ring gauge brings us a more thorough understanding of the role of, namely: backgauge ring surfacing, gauge ring and the roller sleeve end clearance becomes smaller, so that the material particles toward the edge of the disc process suffered a higher resistance, not only to avoid the bypass phenomenon of materials, but also to ensure that the material to be ground in the residence time on the disc.