Analyze Types and Operating Principle of Hammer Mill

Published: Jan 28,2015 11:04:36


 Hammer mill is a machine used to crush materials by the collision between the high-speed hammer and materials. Different from wood crusher, hammer mill is suitable for milling relatively soft and small size raw material like tree branch, cotton stalk, corn stalk, wheat straw etc. with size less than 50mm(diameter). After milled, the output size can reach diameter 3-5 mm, then it is suitable for wood pellet processing. Hammer milll ( is widely used for grinding the biomass material like straw, grain stalk, wood chip and tree branch to be powder of less than 3-5mm, which is the suitable size for making wood pellet. Both coarse and fine grinding can be realized through adjusting the gap between hammers and screen.

Hammer Mill

There are two main types of hammer mill, there are either based on a gravity system or a cyclonic system. This difference does not relate to the actual process of size reduction but the removal of particles post size reduction. A gravity hammer mill basically means that the material flows through the machine only by gravity and we then use a screw auger in the base to collect the material and move it onto the pellet mill. The advantages of this system is there is less dust which is better for operators and in keeping dust our of the finished pellets. The other version of a hammer mill uses a fan and a cyclone separator to collect the material from the based of the material and deposit it into the pellet press. The problem with this is that cyclones are not 100% efficient at separating material from the air flow. Therefore fine dust will leave the top of the cyclone.

Operating Principle of Hammer Mill

In the hammer mill, the motor drives the rotor to rotate at a high speed through the belt, and on the rotor there are series of hammers. When the materials get into the working area of hammers, the rotating hammers with high rotation speed are crushing them, the crushed products meeting the required size can be discharged by the outlet and become the final products, the large size products are brought back to the crushing area by the hammers for being re-crushed until they reached the required size.

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