Universal Mill

We manufacture universal mills for grinding different types of materials inside the same mill housing to desired fineness. This versatility is achieved by means of five different types of ROTOR + STATOR combinations for grinding a great variety of products. These ROTOR + STATOR combinations are mutually interchangeable, so that, if necessary, changeover to another desired type is conveniently possible. Due to this feature the machine is called Universal Mill. It is also commonly known as Pin Mill or BT Mill. The mills run at a peripheral speed and are perfectly balanced to avoid any possibility of vibration. They generate a strong air current to allow the products to be fed and not the mill under its own suction force as well as to convey the ground products to a distant collection point. They can also be combined with other machines into an appropriate system for fulfilling various requirements in practice

Operation:

The material to milled is led out of the feed hopper by a mechanical feed dosing device into the feed inlet or suction spout of the mill. The rate of feed needs to be controlled for ensuring a uniform trickle feed so that uniform milled product is obtained without blocking or overloading the mill. Suitable controls are provided with the mill.

In the feed inlet of the mill a strong permanent magnet can be provided to catch hold of any ferrous tramp matter. The feed material mixed with a quantity of air aspirated by the running of the mill rotor, enters the milling chamber near the central axis of the rotor. The material is hurled vigorously outwards toward the periphery of the rotor by centrifugal force and progressively reduced in size by the milling rotor till it reaches the circumferential sieve ring. After passing the sieve ring the milled powder has to be separated from the accompanying air.

The degree of fineness achieved will depend on the nature of product, type rotor and the sieve ring fitted. It is also influenced by rate of feed, the quantity of air sucked into the mill with the feed and the peripheral speed of the rotor.

Five Types of Dry Grinding Rotors:
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Bar Turbo (BT):

Turbo Mill is well suited for efficient grinding to a high degree of fineness. The actual fineness obtained depends on the material, tip speed, the design of the sieve ring, size and shape of the sieve perforation as well as throughput of material and air. Tip speed of turbo mill ranges from 40-120 m/sec.

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Inclined Bar Turbo (BT-SL):

Inclined Bar Turbo Mill can grind finer than turbo mill by virtue of inclined grinding bars, increase in the area of grinding baffles and reduction in open screen area. The maximum permissible tip speed is 120m/sec.

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Stud Bar Teeth (SBT):

The Stud Bar Teeth mill is used either for grinding to medium degree of fineness or processing of the material containing hard or large pieces. In the SBT mill the material is ground in stages between the studs on the rotating grinding disc and teeth on the mill door before passing through the sieve. The maximum permissible speed is 80 m/sec

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Cross Bar Beater (CBB):

Cross Bar Beater mill is discharged from the cross beater mill more rapidly than the Turbo or SBT mill. Serated plates on the rear wall of the grinding chamber and the door intensify the grinding effect and protect the mill from wear. Maximum permissible tip speed is 80 m /sec.

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Pin Bar (PNB)

For fine grinding, turbo mill, inclined bar or pin mills are used. The pin mill is used particularly for slight adherent products which otherwise clog the hole in the sieve ring. The maximum permissible speed is 120 m/sec.

  • Flexibility to incorporate Cryogenic grinding arrangement.
  • Available in four sizes of grinding chamber diameter of 130 mm, 220 mm, 450 mm & 800mm. These are suitable for the operations for small-scale to large-scale manufacturing
  • Lower specific energy input (KWh/T) resulting in lower energy consumption
  • Ease of Maintenance: The repairs and maintenance are made simple and economical because the mills have only one rotating part
  • Efficient feed and product collection devices minimise the number of production personnel
  • Standard mills have casted housing, door, and feed spout.
  • Rotors and stators are manufactured from wear resistant steels. Special materials of construction are used to suit the nature of the product
  • Stainless steel and Cast steel versions are available
  • The mills being compact in size occupy reasonably low floor area
  • Can be adopted to suit various mounting, feed and delivery configurations
Model B130 B220 B450 B800
Main Motor HP 2-3 3-10 15-40 30-75
Rotor Speed (max.) rpm for Turbo & PNB 18,000 10,000 5,150 2.800
Rotor Speed (max.) rpm for SBT & CBB 12,800 7,100 3,650 2,000

Industries

Cement
Agro - chemicals
Chemicals
Minerals
Paints
Pharma - ceutical
Steel
Food

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