21-01-2016, 12:19 PM
Construction and working principle:
Hammer mill consists of a metal casing, enclosing a central shaft to which four or more hammers are attached. These are mounted with swivel joints, so that the hammers swing out to a radial position when the shaft is rotated. The lower part of the casing consists of screen through which materials can escape, when sufficiently size reduced. The material is collected in a container placed below the screen.
· The screen can be changed according to the particle size required.
· According to the purpose of operation the hammers may be square-faced, tapered to a cutting form or have a stepped-form.
· The interior of the casing may be undulating in shape, instead of smooth circular form for better impact.
· The rotor operates at a speed of 80cycles per second.
Advantages:
(a) It is rapid in action, and is capable of grinding many different types of materials.
(b) The product can be controlled by variation of rotor speed, hammer type and size and shape of mesh.
© Operation is continuous.
(d) No surface moves against each other so very little problem of contamination of mill materials.