Grinding systems are widely applied industries dealing with processes such as pulping, milling, and manufacturing hardened solids. Pulping is most common in industries dealing with the manufacture of juices, beverages and wines. Milling is common in sawmills and grain grinding machines. Industries dealing with the manufacture of solids on the other hand require grinders to reduce the grain size of materials to a desired size. Reducing the grain size of materials results in component hardening hence making the process applicable in many industries. There are many types of grinders meant to suit the mentioned applications. Some of them are discussed below.
When it comes to coarse grinding, the most appropriate grinding systems to be used are the hammer type. They have a rotary shaft that is used to swing hammers and as a result grind the materials fed into the machine. They also have a strong steel casing to contain the ground fragments and expose them to the rotating hammers. The systems make use of screens to filter different grain sizes as required by the user. Fine grinding is done better with the impact mills. Unlike hammer mills, the impact type do not use screens for grading. They use air swirls to grind coarse grains into fine particles.
Other types of grinding systems include rod mills, ball mills, semi-autogenous mills, autogenous mills, pebble mills, high-pressure mills and Buhrstone mills. However, these are rare in the market and are used for specific applications. Most of the mentioned types are powered by electricity with some using high voltages and others using low household voltage. Whenever electric power supply is not available, the diesel-powered systems are used. Some people still find it convenient to use animal powered grinders especially in rural areas. However, these types are also rare in the market. Wind powered and water powered mills are also suitable alternatives to electric grinders.