LM – Vertical Grinding Mill

LM series vertical mill is one advanced mill, adopting top technology domestic and abroad, and based on many years’ mill experiences. It can crush, dry, grind, and classify the materials.
LM series vertical milling machine can be widely used in such industries as cement, power, metallurgy, chemical industry, non-metallic mineral. It is used to grind granular and powdered materials into powder with required fineness.

Features:
1. Low Investment Cost. This mill itself can crush, dry, grinding, classifying, so the system is simple, and occupation area is about 50% of ball mill system. In addition, it can be installed outside, so it will reduce a large number of investment costs.
2. Low Operation Cost. ⑴ High efficiency: roller compacted materials directly onto the grinding disc, so power consumption is low. Compared with ball mill, it saves energy consumption by 30% ~ 40%. ⑵ Less wear and tear: As the roller is not in direct contact with the disc, and material of the roller and liner is high quality, so life lime is long.
3. High Drying Ability. As the hot air inside contacts directly with the material, drying ability is higher, and it saves energy. By regulating the air temperature, it can meet requirements with different humidity.
4. Simple and reliable operation. ⑴ It is equipped with automatic control systems, so remote control makes it easy to operate. ⑵ It is equipped with one device,which prevents the roller from contacting with the liner directly, and avoids the destructive impact and severe vibration.
5. The stability of product quality. As the material stays in the mill for a short time, it is easy to detect and control the product particle size and chemical composition, to reduce duplication of milling, stable product quality.
6. Maintenance convenience. By repairing fuel tank, rotating the arm, it is fast to replace the roller sleeve, and liner, and reduce the downtime loss.
7. Environmental protection. It is with small vibration, low noise, and the overall sealing. The system works under negative pressure, so there is no dust going out. It meets the requirements of the state Environmental Protection.

Working principle:
Vertical mill has two pairs of grinding rollers, each pair of roller composed of two narrow rollers, mounted on the same axis and can rotate at different speeds. There are two circular disc slot, and roller to the tire shape, work pressure in the tank. Disc roller and the relative sliding velocity between small and roller can swing, even if the roller sleeve and the disc after the liner wear can guarantee a good abrasive, will not affect the grinding effect. Roller symmetrical structure, one side can be upside down after use and wear. Material grinding process: hydraulic pneumatic roller device through the pressure applied to the material on the crushing of materials, the materials have been moved to crush the edge of disc, from the disc around the nozzle from the exhaust air to improve these materials to Separator.Meal to separate returns after a concentrated mill, fine powder was collected in the precipitator unloading. In the gas flow is small, the meal can not be increased to enhance air flow, they would fall through the nozzle discharged outside the mill, bucket elevator to be transported to the feeder of vertical mill and was re-grinding mill feed people.

Technical data:

Series Coal mill
Model LM130M LM150M LM170M LM190M LM220M LM240M
Disc Dia. (mm) 1300 1500 1700 1900 2200 2400
Capacity (t/h) 10~15 16~22 20~28 26~35 35~45 40~50
fineness (R0.08) <15% <15% <15% <15% <15% <15%
Coal powder moisture <1% <1% <1% <1% <1% <1%
Max.input size (mm) <38 <40 <42 <45 <50 <55
input moistrure <15% <15% <15% <15% <15% <15%
Inlet air temperature (℃) <350 <350 <350 <350 <350 <350
Outlet air temperature (℃) 75~95 75~95 75~95 75~95 75~95 75~95
Dimension Lmm 3500 4200 4700 8500 10200 11700
Wmm 3400 3900 4500 5600 6700 7710
H mm 5800 7100 8300 8800 10600 12200
Weight (t) 46 75 94 100 122 157
Series LM for hard materials
Model LM130N LM150N LM170N LM190N LM220N LM240N LM280N LM340N LM370N
Disc Dia. (mm) 1300 1500 1700 1900 2200 2400 2800 3400 3700
Capacity (t/h) 7~11 9~13 11~15 14~20 22~26 27~35 48~55 65~89 90~100
Output fineness Micron(μm) 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45
mesh 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325
Moisture of slag ≤12%
Product Blaine ≥420㎡/kg
product moisture ≤1%
Main mill power(kw) 200 280 400 500 800 900 1120 1800 2240

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