Design and function
Hammer mills are radially fed for dual-rotational operation to achieve uniform wear and full utilization of screens and hammers. Models with tangential inlets are available for low-density products. The hammer mills have a direct coupled motor mounted on a base frame. The front doors are bottom-hinged and open on sliding rails. All operating points have electronic safety equipment. The hammer mill is supplied with a separator and a magnet above the inlet to protect the grinding chamber against damage and spark risks from foreign objects in the material flow.
Material feeding in full grinding chamber length means high controllability of particle size and uniform loading of hammers and screens, resulting in longer lifetime of wear-parts and higher output per kilowatt. The feed system, which is available as double screw and separator or as pocket feeder with integrated separator and distribution roll, can be adjusted to suit all raw material types.
Method of Operation
Installation of the hammer mill is on the production floor or in a pit. Feeding is done manually. An infeed chute for belt conveyor feeding is available. The material’s size is reduced by impact from fast rotating, free swinging type hammers. A screen holds the material inside the grinding chamber, as long as it is too coarse. Fine material gets discharged through the screen into a pneumatic discharge system. Bottom discharge onto a mechanical conveyor or into a bin is also available. An open rotor with hammers having a thickness of 8 mm is standard. Bearings are outboard and no grease can enter the grinding chamber. Hammers come in sets of equal weight. The screen has a maximum open area for maximum capacity. The standard hole size of the screen is 10 mm but other screen sizes are also available.
Its application include pulverizing of all types of brittle, fibrous, medium hard to soft materials such as plants, roots, chemicals, pharmaceuticals and soft minerals. The hammer mill can also be used for crushing cellulose, leather waste and any other organic or inorganic materials. Its benefits include low in-feed height, positive in-feed of material, no adjustments inside the machine required, good access to the grinding chamber for easy cleaning, safety switches for maximum operator protection, steel fabricated design, rugged and reliable and compact space saving design.