Mini Dal Mill

Mini Dal Mill
This is simple in constructions & easy to operate & maintain. It consists of horizontal tapered roller. The roller is covered with emery coating surrounding by screen through which husk is discharged. The shelled pulse passed through aspirating fan on osc

• Improved yield of Dal  due to use of improved technology.
• Easier operation & less maintenance cost.
• Operated by 2 H.P. Electric motor/Oil Engine.
• Recovery of head pulses - 78% to 80%.
• Recovery of Brackens-1% to 3%.
• Dehusks & Splits all pulses including MOONG (Green Gram) 98% to 100%.
• Retains proteins and natural shine.
• Automatic arrangements of collection the following in separate containers and bag.
• Dehusked & split pulses
• Un-dehusked pulses
• Brackens 
• Husk  
• Dust free operation. No pollution hazards
• Effective and continuous making pulses, leading to increased production and faster return on investments.
• Rotating parts are balanced for reducing friction losses & noise.
• Size of machine : Length 1650 mm  Width 900 mm Height  1350 mm

Construction:

This is simple in constructions & easy to operate & maintain. It consists of horizontal tapered roller. The roller is covered with emery coating surrounding by screen through which husk is discharged. The shelled pulse passed through aspirating fan on oscillating sieve unit. Where appropriate grading of pulse is done.

Suitable Motor for Dal mill:

The motor is provided with a pulley and is mounted at the bottom of the stand with V-belt to drive it. The motor requirement is of 2 HP single / three phases.   

Process on Dal mill

Cleaning and grading:

This unit consists of a vibratory/Cycinderical grader withsieve, hopper, grain collector, waste collector and motor. The  sieves are provided with different size holes to match the requirements of the type of Dal being processed. The Cycinderical Grader is  operated by  a motor driven shaft.

Pitting

An emery roller machine is used to obtain cracking and scratching of clean pulses passing through it. For loosening the husk to facilitate the subsequent oil penetration this is required. Gradually the clearance between the emery roller and cage (housing) is narrowed from inlet to outlet. Cracking and scratching of husk takes place mainly by friction between pulses and emery as the material is passed through the narrowing clearance. During the operation some of the pulses are de-husked and split which are separated by sieving.
  
Pretreatment with Oil:

A screw conveyor allows passing the scratched or pitted material through it and mixing of some edible oil like linseed oil is completed. The linseed oil is used at the rate of 1.5 to 2.5 kg/Tons of pulses. These are kept on floors for about 12 hours to diffuse the oil.

Conditioning

Pulses are conditioned by alternate wetting and drying. Moisture (3.5%) is added to the pulses after sun drying for a certain period and tempering is done for about eight hours. The grain is dried in the sun again. By allowing water to drop from an overhead tank on the pulses which are passed through the screw conveyor addition of moisture to the pulses are achieved. Until all pulses are sufficiently conditioned the whole process of alternate wetting and drying is continued for two to four days. Pulses are finally dried to about 10 to 12% moisture content.

De-husking and Splitting:

For De-husking of conditioned pulses emery rollers called as Sheller/Flour Mill Horizontal machine are used. In one pass or single operation about 50% of pulses are de-husked. De-husked pulses are split into two parts. De-husked split pulses are separated by sieving and the husk is aspirated off. Un-split de-husked pulses and tail pulses are again de-husked and milled in a similar way. Till the running pulses are de-husked and split of the whole process is repeated two or three times.  

Polishing:

Polishing is completely by treating de-husked and split pulses with a small quantity of oil and/or water.   

Pre-Milling of Pulses:

To obtain best results during de-husking and splitting of pulses in the pulse de husking machine latest model improved version, pre milling including grading of pulses size wise is very essential.
Basically the raw pulses are first cleaned of dust, chaff, stones and other extraneous materials.Cleaned pulses are graded by sieves or pulses graded and soaked in water in cement tanks having  depth. Height of pulses soaked be and the water level should be above the pulses. Soaked pulses are taken out of the water after specific time and put on the sieve. Swollen pulses which do not pass through sieve (from which un-swollen pulses earlier passed through the same) are ready for heaping in shade whereas the pulses which pass through the same sieves. Then these pulses are ready for heaping in shade. Degree of happing of swollen pulses in shade should be 30 to 40. This process should be continued till the pulses are swollen to the desired extent. There after the pulses are in thin layers in the open sun drying. Duration of sun drying of pulses vary according to weather condition prevailing at the time of processing. After sun drying the pulses are again heaped in shade so moisture contents in the pulses may become uniform as need in them for de-husking. Then the pulse are graded again fed in to the pulse de husking machine in  Mini Dal Mill  in graded lots to achieve he best results with minimum brokenness.

Dehusking and splitting of pre-conditioned pulses per hour