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Impact crushing in hammer mills. As the name suggests, impact crushing is a special crushing process. But what is so special about this type of comminution? And how does the hammer mill work?
Basically, a hammer mill can grind various materials to different degrees of coarseness. First, the material to be ground is fed from the vacuum mixer dryer into the feed hopper, which has a volume of 150 litres. A screw conveyor transports the material into the hammer mill.
Once there, the grinding process is carried out by pendulum-suspended hammers weighing 840 grams. When the shaft rotates, the hammers move radially outwards and, as they rotate, break down the material to be ground in the grinding chamber.
When the material has reached the required or desired fineness – the impact bars in the grinding chamber serve as an anvil – the ground material falls down through the 2 mm sieve grate. The so-called grinding discharge then takes place via a bag connection spout, which can be seen very clearly in the picture.
The pendulum-mounted hammers also serve as overload protection for large and very hard grinding material. In total, the grinding capacity of the hammer mill is designed for 800 kg/h.
The hammer mill thus works according to the principle of impact comminution and enables large to medium comminution of soft to medium-hard, but sometimes also hard materials. Thanks to this principle and the hammer mill, a wide variety of materials can be excellently ground, crushed and prepared for further processing.