Hammer crusher machine consists of rack, rotor, hammerhead, liner as well as grating. The rack is to protect the core of crusher machine. It opens a feeding port at the top while its bottom can be fastened to the foundation. Motor is the core of crusher machine, which consists of Hammer crushers, also known as hammer breaks, hammer mills, can crush the 600-1800mm materials to below 25 or 25 mm. As often used in coal mines for broke coal blocks, it is also known as a coal crusher. Hammer Crusher Features . 1. High crushing ratio, the crushing ratio ranges from 10 to 25 or even higher to 50. 2.