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The Vertical Roller Mills developed by AMCL Machinery Limited are based on technical knowhow from Nihon Cement Co. Ltd. Japan. These machines are used for substantial power saving and capacity enhancement in the field of Clinker and Rawmeal Grinding. We have over two decades of experience in supply and installations of Vertical Pre Grinding. We have supplied 30 Installations in India & Middle East.

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Clinker or Limestone is fed through a central chute in the VRM where centrifugal force, combined with the rotation of the table, distributes product over the table surface. The table and rollers then grind the material, which is then extracted from the VRM by gravity and a little help from a scrapper. A grinding force is transmitted to a set of three rollers at 120 Degree apart through a hydraulic system.

We are offering our Mill System for up gradation and optimization of existing Cement plants and Raw Grinding Systems

The VRM can be used in

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Roller type is made from special alloy steel castings and are confirming to Nihon Cement Specification AT-C for wear resistance. Spherical shape of roller increases its life. Roller Shaft made out of special alloy steel duly hardened tempered and ground. Roller shafts are clamped to the journal head which are hinged to the spindle. Grinding Force is provided by hydraulic cylinder transmitted to Roller Through Spindle

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The grinding table made out of high grade cast steel is directly mounted on gear box output Flange. The upper surface of the table is fitted with table liner segments constructed of special wear resistant cast steel and held in place with retainer ring. The table liner is divided into segments for ease of handling. A scrapping paddle is indatlled below the table and the paddle is driven by rotation of the table.


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 Size

 VRM Feed(%)

 VRM Outlet(%)

 Product From Screen

 (+) 25 mm

 5.4

 

 

 (+) 12.5 mm

 35.5

 0.8

 

 (+) 6.3 mm

 67.6

 10.7

 

 (+) 3 mm

 88.4

 27.5

 7.4

 (+) 1 mm

 98

 32.7

 25.6

 (+) 212 Micron

 

 54.9

 50.7

 (+) 90 Micron

 

 67.6

 65

 (+) 45 Micron

 

 81.5

 76.2

 (-) 45 Micron

 

 18.5

 23.8


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 Model  VRM 180 - 3  VRM 230 - 3  VRM 270 - 3
 Capacity (TPH)  90-120  150-170  210-250
 Table dia. (mm)  1800  2300  2700
 Motor (Kw)  750  1200  1850
 Weight (Tons)  100  160  260


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We Supply world Renowned Make Planetary Gearbox suitable for VRM models based on the motor kw.

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  • Non- air swept grinding and is therefore energy sufficient
  • Approx. 50% - 70% increase in Grinding Capacity
  • Low Maintenance
  • Specific Power Consumption of Grinding System can be reduced by 15 – 20 %
  • Long Life for table liner and roller.

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vrpm

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The centrifugal force generated by the rotation of the table spreads the material across the entire table surface in a uniform layer, where it is caught between the roller and the table liner segments and crushed before being carried to the outer circumference of the table. The grinding Force is transmitted by Roller at the same time through a Hydraulic system. Spherical Rollers also offer high compressive force between table and roller which generates greater shearing force. Therefore high efficiency grinding is carried out by simultaneous compression and shearing force

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As spherical rollers have higher periphery, a wider uniform grinding layer is formed and hence increases grinding efficiency.

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Fluctuations is clinker size and feed rate can easily be accommodated.


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Several Configurations are possible, such an as open circuit mill, close circuit mill and feeding to more than one ball mill.

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VRM is very compact hence require little space. It can be accommodated easily in existing plants.

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Symbol

Chemical Composition

Hardness(Hs)

Impact Value(Kg-m/CM2)

Tensile Strength
(Kg/m2)

Application

 

C

Cr

 

 

 

 

 

Grade – C

3.0

20.0

Mo, Ni

>90

>0.5

>70

Extra Heavy Wear – resistant materials etc

Grade – M

3.0

20.0

Mo,Ni

>85

>0.5

>70

Heavy Wear – resistant Material, etc

Grade – F

3.0

15.0

Mo

>90

>0.5

>70

High Grade wear- resistant material etc


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The very compressive force on clinker lumps between rollers and table causes numerous hair line cracks to form, resulting in easy clinker grinding in tube mills.

大博乐时时彩平台官网
As clinker is made easier to grind, power consumption in the tube mills is reduced. Input electric power works as direct energy, crushing clinker lumps efficiently between rollers and table instead of as potential energy through balls in a conventional tube mill; this also results in reduced ball size in tube mill and reduced noise emission.

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AMCL's own machined high chromium cast steel which has been subjected to special heat treatments, has tremendous durability, even against highly abrasive materials such as clinker and blast furnace slag to "An ideal solution for optimizing an existing Ball Mill as well as for new installation."


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VRM works in a closed circuit with Multi Deck Screen, Clinker and Gypsum are fed to the feed of chute of VRM. The output of VRM is fed into Multi-Deck Screen through Bucket elevator from where + 3mm size is re-circulated to VRM and – 3 mm size is re-circulated to the Ball Mill. These – 3mm size contains considerable amount of fines. The output Ball Mill goes to the cement silo through Separator and Bucket elevator.

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