Abstract: The commonly used alloy hammer of vertical impact crusher has poor quality, short life and large consumption, affecting the equipment availability. The hammer material and mass are studied. As a result, high chromium alloy is selected as hammer material, which, when heat treated, has high wear resistance, good ductility and long service life and therefore, is an ideal material for hammer. With respect to the hammer mass, a computation formula of hammer mass is deduced according to the hammer kinetic analysis and crushing conditions, providing a theoretical basis for determining the hammer mass.

Key words: Vertical impact crusher, Hammer material, Hammer mass