Hammer mill machinery in India is amongst the oldest and commonly used grinding mill. It consists of a range of hammers hinged on a central shaft, which is enclosed within a robust metal case. By impact, it produces size reduction. The materials that have to be milled are struck by the ganged hammer that rotates at high speed inside the chamber. Brittle fracture is caused to the feed material due to the movement of the swinging hammers at a high angular velocity.
This machinery crushes materials in the following two stages –
• Reduction of size caused by dynamic impact
• Sizing that takes place by shear and attrition in the 2nd zone where small clearance exists between the screen bar and the hammer
Repeated hammer impacts help in shattering and crushing the feed material. The targeted particle size is controlled by factors like:
• Hit resistance
• Rotor speed
• Feed rate
• Clearance between the grinding plates and the hammer
• The size of the screen opening
Hammer mill classification
Hammer mill machinery in India is classified into the reversible and non-reversible type of hammer mill. The classification is according to the direction of the rotor. Even though their construction differs, their grinding and working actions remain the same.
Advantages of hammer mills
• Specified top sizes can be produced without using a closed-circuit crushing system
• The energy requirements are reasonable
• It has a high capacity and a high reduction ratio
• The machine occupies a small space and can grind different types of materials
• Hammer mills can be cleaned and maintained easily
Hammer mills are used widely in the pharmaceutical industry to process dry or wet granulations, disperse powder mixtures or milling pharmaceutical raw materials. If you are looking for hammer mill machinery in India, do not hesitate to talk to an expert.
