Performance
1.As the grinding principle of material layer, materials stay in the mainframe for a very short time , thus decrease repeat grinding ,so the percentage of Iron is little .When it grind white or transparent material , the whiteness and purity of the finished product is higher, which ball mill cannot reach.
2.The rotary speed of mainframe motor is changed by the frequency control, so the material to be processed is very broad.
3.The ultra fine theory and the multiple classifier make it save 30%-50% energy than the other types of mills when producing products with the same fineness , so it is economic.
4.PLC/DCS automatic control is used to increase the pressure for the rollers ,which makes the pressure can be controlled accurately and no need for the manual operation.
5.Single lubrication station is used for the rollers, in addition, double pumps for every roller with the "pumping-absorbing at one time" working style , which makes the roller bearings not only lubricated and cooled totally ,but also make sure little trapped oil and no possible leakage in the bearing chamber.
6.Little wear. Because the roller and the roll is not touched when the mill is working and the rollers and liner plates are made of strong- quality materials , so there is little wear and the usage life is longer.
7.Both electronic and mechanical limit device not only prevent the direct touch between the roll sleeve ,mill stone and liner plates, but also avoid destructive impact and violent vibration.
8.The rollers can be turned out of the mainframe to examine and repair , and it is more convenient to change the roll sleeve and liner plates ,which decrease the stop loss.
9.Little vibration , low noise and the sealed equipment works under negative pressure make sure no outlet powder , clean environment and can reach the national environmental requirement.
Working Principle
The main motor drives the millstone to rotate through the reduction box, meanwhile, the air flow gets into the mill through air intake. The materials come out of the screw feeder and fall on the center of the millstone, and then they will move from the center to the edge of the millstone under the affect of centrifugal force. When they move across the grinding zone, they will get grinded by the rollers. Those materials in big pieces will be crushed and grinded directly while those small ones will get extruded and they will form a material bed in which intergranule and mutual grinding will take place. The grinded materials keep moving to the edge of the millstone until they are taken away by the air current at the air ring, and the big pieces will fall again on the millstone to be grinded. The materials in the air flow will go through the rotor vanes on the separator above. The coarse powder will go back to the millstone while the eligible powder will go out of the mill together with the air flow and get collected by the powder collector. Those collected powder is the final products of the LUM grinding mill. The sundries mixed in the materials that go into the mill, iron piece for instance, will move to the edge of the millstone with the materials and fall down to the bottom part of the mill since they can not be blown up because of their own weight. And then these sundries will be scraped to the slag-discharge opening and discharged out of the mill. The final products can be in different fineness through adjusting the rotating speed of the rotor of the powder concentrator.
