LM Vertical Grinding Mill

Detailed introduction

Technical features and advantages

  • 1. Small occupation area Low investment cost;
  • 2. Low operation cost and long service life;
  • 3. High grinding efficiency;
  • 4. Excellent drying function;
  • 5. Good final products quality;
  • 6. Easy to maintain;
  • 7. Environmentally friendly;
  • 8. High classifying capacity.

Working principles and applications

SBM LM series vertical grinding mill is widely applied in metallurgy, construction, chemical and mining industries, being the preferred equipment in grinding industry. It can be used in grinding non-flammable and non-explosive materials with Mohs’ hardness below 9.3, such as grinding quartz, feldspar, calcite, talcum, barite, fluorite, iron ore, copper ore quartz, slag, cement clinker, zircon sand, fly ash and carborundum, coal, etc.

The design attributes of vertical grinding mill

The vertical grinding mill researched and created by technical gurus of SBM Machinery is dependant on years of analysis on industrial mill, which draws about the fineness grade innovative technology of Germany and Japan, as outlined by the ideas of fluid mechanics, they devoted themselves to establishing the efficient micro powder grinding mill, and fix domestic complications of your large cost of jet mill, resolve ultra-fine powder classification complications. Production and energy consumption are up to the nationwide standard, it ranks the innovative degree and will get a lot of users’ praise.

Vertical grinding mill is mainly composed by the host, blowers, ultra-fine analysis machine, finished cyclone powder collector, bag filter and connecting duct and so on. Based on customers' demand, the site can also be selectively equipped with the hoist, storage silos, control cabinet to the powder machine, crusher and other auxiliary equipment.

It has many advantages as follows:

  • 1. Wide scope, it can grind a variety of materials with less than 6 grade hardness;
  • 2. Under the action of spring, product fineness is greatly improved;
  • 3. Compared with jet mill, the system has low vitality consumption;
  • 4. Less investment, substantial efficiency, quick recovery;
  • 5. Fewer production links, materials with less than 25mm are directly processed by the machine;
  • 6. Pollution-free, dust-removing effect fully meets the state standards;
  • 7. Roller device has good sealing effect.

Technical data

Model LM130K LM150K LM170K LM190K LM220K LM130M LM150M LM170M LM190M LM220M LM130N LM150N LM170N LM190N LM220N
Wheel diameter(mm) 1300 1500 1700 1900 2200 1300 1500 1700 1900 2200 1300 1500 1700 1900 2200
Output (th) 10-30 13-40 18-57 23-72 36-110 10-15 16-22 20-28 26-35 35-50 5-14 7-20 8-27 9-30 18-55
Finish fineness μm 170-45 170-45 170-45 170-45 170-45 170-45 170-45 170-45 170-45 170-45
Mesh 80-325 80-325 80-325 80-325 80-325 80-325 80-325 80-325 80-325 80-325
Coal powder fineness (R0.08) 5-20% 5-20% 5-20% 5-20% 5-20%
Coal powder moisture (%) <1% <1% <1% <1% <1%
End product moisture (%) ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1%
Grinding material particle size D80 (mm) <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10 <10
Grinding material max feed size(mm) <38 <40 <42 <45 <50 <38 <40 <42 <45 <50 <38 <40 <42 <45 <50
Moisture of grinding material not to dry (%) <4% <4% <4% <4% <4% <4% <4% <4% <4% <4%
Matieral moisture of into mill (%) <15% <15% <15% <15% <15%
Moisture of grinding material need to dry (%) 4%-15% 4%-15% 4%-15% 4%-15% 4%-15% 4%-15% 4%-15% 4%-15% 4%-15% 4%-15%
Into mill air temperature (℃) <350 <350 <350 <350 <350 <350 <350 <350 <350 <350 <350 <350 <350 <350 <350
Out of the mill air temperature (℃) 70-95 70-95 70-95 70-95 70-95 75-95 75-95 75-95 75-95 75-95 70-95 70-95 70-95 70-95 70-95
Raw coal hardgrove grindability index (HGI) >55 >55 >55 >55 >55
Main motor power (kw) 200 280 400 500 800 185 250 315 400 500 200 280 400 500 800
Contour dimension Length (mm) 5520 6550 7170 7580 8080 5520 6550 7170 7580 8080 5520 6550 7170 7580 8080
Width (mm) 2500 3070 3460 3320 4660 2500 3070 3460 3320 6700 2500 3070 3460 3320 4660
Height (mm) 7060 7560 8300 8960 9020 7060 7560 8300 8960 9020 7060 7560 8300 8960 9020
Vertical Grinding Mill

Principle of Grinding Mill and Grinding Characteristics

Grinding the principle of grinding is the use of 2 to 4 grinding roller close to the disc, the medium speed rotation of the material grinding. Basically the material layer is crushed. The material is mainly pulverized by the roller in the grinding mill, and there is a difference between the rotation of the roller and the disc, so it also has a shear grinding effect. The material fed into the center of the disc is moved into the roller between the roller and the disc by the action of the centrifugal force of the rotary disc. Roller in the hydraulic device and the role of the pressure mechanism, the roller to the material within the grinding pressure. The material is crushed by the crushing action to continue to move to the edge of the disc, from the disc edge of the block ring overflow. At the same time, the hot air is ejected from the annular nozzle around the disc, and the coarse particles are blown back to the disc to be crushed and the material is suspended and dried. Fine powder with the hot air into the upper part of the separator for separation, to a certain particle diameter of the qualified fine powder with the air from the top of the vertical mill overflow and collection, coarse powder back to the disc and feed the material with the re-grinding.

From the above working principle of grinding mill can be seen:

(1) grinding mill must keep the roller and the disc on the material layer to produce a large enough grinding pressure, so that the material is crushed and crushed. The grinding pressure, ie, the roll pressure, is related to factors such as abrasibility of the material, moisture, required yield, wind speed in the mill and grinding mill type and specification. Easy to wear and moisture of small materials, and the production requirements are low, the roller pressure can be smaller. The roller pressure is dependent on the pressure applied by the hydraulic system to the pressurizing device (rod) and the weight of the roller and can be adjusted during operation.In addition, the material layer on the disc must have sufficient stability and maintain a certain height of the material. As shown in Figure 2-1, the bulk material is first subjected to roller compaction and the roll pressure is concentrated on the bulk particles. When the roll pressure increases to or exceeds the material of the compressive strength, the material is crushed. The other larger particles are then continuously rolled to reduce the particle size until the fine particles are squeezed out of the disc.

(2) grinding mill grinding efficiency not only with the roller pressure, but also with the height of the material layer. It is necessary to keep a sufficient contact between the roller and the disc in contact with the material. And to maintain a certain height of the material layer, so that the material to bear the same roller pressure. For the formation of a stable material layer more difficult materials, must take measures to be controlled. Such as feeding the dry material or fine powder more material, easy to flow on the disc, the material layer is unstable, so some of the way to take water and moisture to stabilize the material layer. It is also possible to adapt the unstable material layer by automatically adjusting the roll pressure.

(3) grinding mill is a drying and grinding of the wind sweep mill, the body cavity larger, allowing a larger air flow, so that the fine particles in the grinding material in the state, so the grinding mill for When grinding raw materials or coal, the drying efficiency is higher.grinding mill and dry cement kiln supporting the use of, can make full use of the preheater discharge of hot exhaust gas into the mill bake in the material. General grinding mill can be dried up to 15% of the raw material.

(4) in the vertical mill grinding and powder as one. When the material particles leave the edge of the disc, the air ring is blowing high-speed airflow and rise, fine particulate material is brought to the separator, the finer particles are selected, the coarse particles from the air settling to the disc , There are some coarse particles at a lower speed into the classification area, may be the rotor blade hit off and drop to the disc, the formation of circular grinding.


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