INTRODUCTION

Staying tuned up with time and technology for over 35 years, LEW aspires to give our customers best solution, better products and services. We strive hard to contribute substantially to the global priority areas of energy conservation and environment protection. For saving energy and achieving good quality products, we have developed a THREE ROLLER MILL and a CLASSIFIER for it which ensures consistent output upto 500 Mesh.

PRINCIPLE

Material is ground by pressure & friction between stationary bull ring and the rotating rollers, which swing outwards due to the centrifugal force

 

OPERATION

Material to be ground is fed to the grinding chamber through star feeder. The positioning of the ploughs ensures that the material continuously passes between the rotating rollers and the stationary bull ring and as such this brings about grinding process. The ground material is swept by the ascending stream of air and carried to the classifier. Over sized particles are returned by the classifier to the grinding chamber for regrinding. The desired product is carried to the cyclone. The final product is collected at the bottom of the Cyclone while the Air having fine dust is discharged from the Top of the Cyclone and the Dust laden air goes to the Dust Collection Unit where the dust is separated and clean Air is discharged in the Atmosphere

DESIGN.

  • MILL

The mill foundation houses the drive gear-box which incorporates a thrust bearing to support the central shaft and endures the roller loads. The grinding rollers are hinged on the spider. The roller assembly is uniquely designed to prevent the possible entry of fine powder. A perfect ball bearing with neoprene rubber seal is incorporated to prevent the entry of dust to the roller arm assembly. The contact area between roller arms and bull ring is maintained in such a way to achieve uniform and gradual wear & tear of the Roller. 

  • CLASSIFIER

The Classifier helps to obtain any mesh size upto 500 mesh by increasing or decreasing the RPM of the Whizzer Classifier through a Variable Speed Drive Motor. A knob is provided to adjust the required mesh. This helps in saving a lot of Time, Money & Energy. A Gear Box is mounted in the Classifier driven by 7.5 HP Electric Motor which is designed in such a way to prevent entry of the dust in the Gear Box.

  • BLOWER

The Fan casing is made from 5 mm M.S. Plate and suitable base is mounted with casing for the Electric Motor arc bearing Housing. The Base is made from 8 mm thick plate The M.S Fabricated Impeller is fitted on the shaft and shaft is mounted with Mono Plumber block and bearings. The blower is driven through a V-belt transmission with the help of Electric Motor.

CONSTRUCTION
the ploughs are cast out of Manganese Steel while the rollers and the bull ring are of Carbon See Casting. Classifier, Cyclone, Dust Collector, Blower, Ducting & supporting structure are made of Mild Steel Sheet a~z structural. Heavy duty Base Plate, Shell and Gear Box ar e made from Cast Iron and Mill Shell Body is single piece casting.

DRIVE

The Induction Motor through V-belt drives the Gear Box. which finally drives the Mill. A separate Motor 5 requirec to drive the Blower.

ITEM NOT IN OUR SCOPE OF SUPPLY

  • Motor and other electrical
  • V-belts
  • Foundation bolts
  • Motor pulleys
  • Motor rails
  • Filter bags for dust collector
  • Foundation or any civil work
  • Initial supply of oil & greases for the mill

APPLICATIONS

Grinding of following minerals:

Barytes              Bentonite               Bauxite

Calcite               Coke                        Dolomite

Lime stone        Red Oxide              Manganese Oxide

 

SALIENT FEATURES 

  • LAXMI ROLLER MILL is designed in such a special way ensuring easy repair and maintenance. Easy access helps quick replacement of worn out parts.
  • The Wear & Tear Cost per ton is Low.
  • A (*) distance piece is provided between Gear box and Base Plate to prevent Dust Entry into the Gear Box. A fan is fitted on the Centre shaft which throws away the -particles coming out of the Centre Plate of the Base Plate. Thus a 100% Dust proof system ensures long life of the Bevel Gear, Pinion & V-Belt.
  • Roller Arm Assembly incorporates a perfect Rubber seal to prevent the possible entry of the fine powder, which reduces easily wear & tear.
  • Even a Semi-skilled person can operate the mill.
  • The Worn-out parts can conveniently be replaced through an easily accessible service door
  • NOTE:- (*) Represent –may different from different models

SPECIFICATION

3-roller

DIMENSIONS ARE IN MM.
 

LAXMI Roller Mill

 

A

 

B

 

C

 

D

 

E

 

F

 

G

 

H

 

 

 

LAXMI Roller Mill

 A  B  C
3 Roller Mill(LRM-770) 7067
mm
3041
mm
1500
mm
3267
mm
1500
mm
3041
mm
2520
mm
5643
mm
3 Roller Mill(LRM-770) 2859
mm
5872
mm
5836
mm

 

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THREE ROLLER MILL (LRM-770)
For Mill -30 HP/960 RPM/TEFC/Sq. Cage Motor
For Blower- 25 HP/1440 RPM/TEFC/Sq. Cage
For Classifier -7.5 HP/ 1440 RPM/ TEFC/Sq.Cage
No. of Rollers:- Three (3 Nos.)
Sr. No. MESH SIZE PRODUCTION IN KG PER HOUR
1 200-1% RETENTION 1400 KGS/HR
2 250-1% RETENTION 1200 KGS/HR
3 300-1 % RETENTION 900 KGS/HR
4 400-1% RETENTION 600 KGS/HR
5 500-1% RETENTION 500KGS/HR

 

 

 

 

The Power consumption of three Roller mill(LRM-770) is 38 to 40 units per hour.

[ The above production figures are on tentative basis as it depends upon the hardness & Grinding ability of the mineral which may  vary +/- ]