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How to operate vertical roller mill

Vertical roller mills are widely used in grinding and ultra-fine grinding of various solid materials in cement, building materials, power, metallurgy, chemical industry, non-metallic ore and other industries.As a manufacturer of the equipment, we want to tell you that correct operation of vertical roller mill is of great benefit to reducing costs and improving production efficiency.
 
Before operating the equipemt,we had better to know about its structure parts and working principle.
 

Structure parts

Vertical roller mill is composed of a main engine, an analyzer, a blower, a finished cyclone separator, a pipeline device and a motor.The main engine is composed of frame, intake volute, shovel cutter, grinding roller, grinding ring, housing and motor. Auxiliary equipment includes jaw crusher, bucket elevator, electromagnetic vibration feeder, electronic control cabinet, etc. Users can choose flexibly according to the situation on site.


Working principle

Raw materials in the main machine rotate by grinding rollers, ring revolution and friction of the grinding rollers themselves. At the same time, the shovel cutter and the grinding rollers at the lower end of the frame throw materials into the grinding rollers and the grinding ring to form a cushion layer, which grinds the materials under the external centrifugal force caused by the rotation of the grinding rollers. For the analyzer, it is driven by the motor through two-stage deceleration at the same time. The blade rotates to classify the grinding from the main engine; the finished cyclone separator, the accessory of the vertical mill, is to collect the grinding separation.
 
The following is operation details

Before operation

Before starting the vertical roller mill, check whether all the repair doors are closed tightly, adjust the direction of the fan and spindle, and the exhaust valve should be in full open position. After starting the main engine, the material should be added immediately (fine granular material should be added first, and normal material should be added) and then the large air flow valve should be opened. On the premise of ensuring that the inlet port does not spray powder outward, the exhaust valve should be closed as small as possible,then adjust the fineness of the finished product. The jaw clearance of crusher with jaw breakage and hoist series should be checked before starting. The speed of analyzer should be adjusted to approximate the size of finished product. 

Start operation

Boot in the following order.
1. Opening bucket hoist
2. Opening jaw crusher
3. Start the analyzer after the material is stored in the warehouse
4. Start up the blower (no load start, to be loaded after normal operation)
5. Start the main engine and start the electromagnetic vibration feeder at the instant of starting the main engine. At this time, the grinding work will begin. 
The operation sequence is as follows: hoist-- crusher--analyzer-- fan-- host-- feeder.

End up operation

When shutting down, the vertical roller mill should be shut down in the following order:
1. Close feeder first and stop feeding
2. Stop the host after one minute
3. Stop the blower after blowing off the residual material
4. Close the analyzer at last
The downtime sequence is: feeder-- host--blower-- analyzer.
 

Note

 The vertical roller mill is not allowed to refuel at will in normal operation. To ensure the safety of production, abnormal noise in any part of the roller mill or sudden increase of load should be stopped immediately to check and troubleshoot, so as to avoid major accidents. If the current is too high when the mill starts, it will affect the start-up.

Factory Address: Longjiang West Road, Shangjie District, Zhengzhou City
Contact number: +86-371-67666660 676667
Mobile phone: 0086 13523465141
After-sales Service Department: 0371-67666667
 

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