Experience In Improving The Output Of Vertical Ore Milling Equipment

Experience In Improving The Output Of Vertical Ore Milling Equipment

Experience In Improving The Output Of Vertical Ore Milling Equipment

The material of 5000t/d clinker production line is LM80K, and the design platform is 400t/h. When it works normally, it can reach 450 ~ 470t/h, and the average power consumption is 20.2kWh/t. The system runs stably. In the middle of August 2011, there was no obvious change in the raw material and operating parameters, but the grinding machine was abnormal. Ore Milling Equipment production low (average 425t/h), the thickness of the material increases, the main motor current increases by about 35A (rated current 276A, normally 195 ~ 240A), but the current alarm, circulating current hoist is not high, the raw material consumption process increased significantly, the average was 22.39 kWh/t, increased the cost of electricity.

Cause Analysis

Grinding Roll And Grinding Disc Wear Seriously

Our raw material Ore Milling Equipment has been put into production since June 2010, due to the serious wear and tear on the surface of the roller, and the phenomenon of surface dropping. The replacement of the roller skin was carried out at the beginning of February 2011. However, due to the poor quality of the new roller skin, the wear and tear of the Ore Milling Equipment were serious and the Ore Milling Equipment output was low. The roll skin was turned over in July 2011. However, because the other side of 1# and 2# rolls also has the phenomenon of surface falling off, the crushing capacity of the Ore Milling Equipment is reduced, the material layer thickness is increased, and the main motor current increases.

The grinding disc liner has not been replaced since it was put into operation, and its surface wear is serious. According to the measurement, the wear of the grinders is 20mm, the thickness of the material layer increases, the average thickness is 145mm, the current of the main motor is high, and the output is limited.

Height Of Retaining Ring Height

After measuring the height of the retaining ring is 105mm, because the wear volume of the disc lining plate reaches 20mm, which is equivalent to raising the height of the retaining ring, so it is difficult for the hard grinding material to be thrown away in time, the thickness of the material layer is increased, and the main motor current increases.

The Abrasion Of The Floor Of The Wind Chamber Is Serious

Because of the long term scour of the material in the wind room, the floor board is worn more seriously on the outside of the scraper, forming a bowl shape, and the phenomenon of wear and tear is worn out in some parts. The material is easy to accumulate, the gap between the scraper and the bottom plate becomes larger, the resistance of the scraper increases and the Ore Milling Equipment current rises.

Reconstruction measures

Reduce The Height Of The Stop Ring

Under the premise of not changing the roller skin and the disc liner, the height of the stop ring is adjusted from the original 105mm to 85mm according to the wear amount of the disc liner so that the hard-to-wear material can be thrown out in time to reduce the material layer thickness.

Repair The Floor

After observation and measurement, the maximum gap between the outer side of the scraper and the bottom plate reaches 150 mm, and the maximum gap between the inner side and the bottom plate is 80 mm. Can be seen that the wind chamber floor wear serious Department is mainly scraper center line and the shell between the parts (see Figure 1). To this end, we use the plate with a consistent curvature of the floor cover welding, to maintain the formation of the floor, and the scraper has been adjusted to make the gap with the floor to a reasonable range.

Transformation Effect

After the above transformation, the Ore Milling Equipment main motor down 15-20A, outside the loop lift current increased by about 5A, the Ore Milling Equipment output increased to 450t / h or more, raw material power consumption back to normal, indicating that the transformation effect is obvious .

Vertical Ore Milling Equipment roller and disc liner in use for some time, due to wear and tear, virtually equivalent to increasing the height of the material retaining ring, so that the material layer thickness increases, the main motor load increases, limited production, the Ore Milling Equipment conditions Larger. In the case of the replacement of the roller skin and the disc backing plate, the method of reducing the height of the stop ring according to the amount of wear can be used to recover the Ore Milling Equipment capacity in a relatively short period of time.

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