Coal Grinding Mill

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SINOMALY coal grinding mills are used in coal powder production lines with an output range of 8-83t/d. We have decades of experience in the production of coal mills that are designed to handle a wide variety of bituminous coal and anthracite with a maximum capacity of 85 T/h.

The main components of this coal grinding mill are made from high-strength alloy, which is wear-resistant and corrosion-resistant.

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Technical Parameters

Model	Main Motor Power(KW)	Capacity for bituminous coal(t/h)	Capacity for anthracite and petrol coke(t/h)
LRMC14.2	110～132	8	5.5
LRMC16.2	160～185	13	9
LRMC18.2	280～315	20	14
LRMC20.4	355～380	25	18
LRMC22.2	380～450	30	23
LRMC26.3	500～630	40	30
LRMC28.3	630～710	48	35
LRMC30.3	710～800	57	42
LRMC31.3	800～900	65	45
LRMC32.3	900～1000	72	50
LRMC34.3	1000～1120	80	55
LRMC36.3	1120～1250	85	60

Remarks: Material Moisture ≤10%, 95% of material has a granularity ≤50mm, Bituminous product fineness R0.08≤10%, Anthracite product fineness R0.08≤2%, Product moisture ≤ 1%, Hardgrove grind ability index (HGI)≥55.

Main Components

1. 1. Grinding roller
  The grinding roller is a device that puts pressure on the material and crushes it on the grinding table. Under the constant pressure, the shape and size of the grinding roller have a direct impact on the grinding efficiency of the material.
  - Grinding roller structure
  - Sketch map of grinding roller after assembling
  - Pre grinding roller
  - Finish grinding roller
2. Lubrication and airtight seal for the grinding roller bearing
Forced oil lubrication is utilized and the system enables temperature monitoring.
3. Rocker arm
The rocker arm is a component that connects the grinding roller and tension device. The pulling force produced by hydraulic cylinder is transferred from the rocker arm to the grinding roller.
4. Grinding table
There is lining plate installed on the grinding table. The surface of the grinding mill is made using wear-resistant materials formed using a weld overlay, and can be re-welded after abrasion build up and reused, thus improving the service life of the lining plate
5. Housing
The coal grinding mill housing has three parts: the lower housing, the middle housing and the housing of the separator, and they are welded into place.
6. Tension device
The tension device includes a hydraulic station, hydraulic cylinder, accumulator and its pipeline. The hydraulic cylinder is pressurized in both directions. When the coal mill starts or stops feeding during operation, the grinding roller can be raised by reverse pressurization to achieve no-load start and no-load maintenance.
7. Separator
The separator completes the sorting process by a vortex plane, making the powder selection efficiency high. The transmission adopts AC motor with variable frequency speed regulation, so the operator can adjust it conveniently according to different requirements such as product fineness and production status.
1. 8. Coal mill foundation
  The mill frame is the basic frame of the entire coal mill, and the columns and reducers are located on the frame to become a whole. The base frame is welded from profiled steel and has an adjustment mechanism to adjust the level of the frame conveniently.
  - Foundation base installation
  - Trial assembly of mainframe in the factory
  - Cement mill stand installing
  - Mill stand
9. Coal mill drive
The drive consists of a mill reducer, a diaphragm coupling, a main motor and a gear reducer, etc.
10. Rotary feeder
The feeding device of the vertical raw mill adopts rotary feeder, which has the advantages of simple airtight structure, stable operation and continuous feeding. The wear-resistant liner of the housing is machined metal, featuring high precision; the gap between the blade and the wear-resistant scraper is adjustable, both of which are wearing parts and can be replaced. Hot air enters through both sides of the housing to prevent the feeder from clogging.
11. Turning device
Each grinding roller is supported separately, and the overhaul door on the middle housing can be opened during examine and repair. The grinding roller can be easily turned out of the coal mill by the hydraulic cylinder, and the roller sleeve can be easily disassembled and removed for convenient overhaul and maintenance.
2. 12. Mechanical limit + electrical limit protection device and material level detection device
13. Hydraulic system
The main valves and oil pumps use the world's famous brand. The hydraulic system is equipped with a double cylinder filter. The normal operation vibration of the equipment can be controlled within < 1.5-2.0 mm/s. The fluctuation of system can be effectively reduced to avoid damage or efficiency loss caused by grinding roller fault or strong vibration.
14. Accumulator