| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a ridge of a reverse surface of a stationary blade to be used as a cutting part and thereby to increase economical efficiency by turning over and using the stationary blade when the cutting part wears off since the cutting part of the stationary blade is formed on top and reverse surfaces of the stationary blade and the stationary blade has a flank for use of a cutting part on a top side and a flank for use of a cutting part on a reverse side, and to reduce crushing shearing resistance, to lighten a load on a driving source such as a motor of a crusher, and to increase economical efficiency since a tool rake angle is given.SOLUTION: Rake surfaces 7b, 7b as top and reverse surfaces of a stationary blade are given a tool rake angleδ, the top and reverse surfaces connecting with a cutting part 7a of the stationary blade comprising two adjacent concave curved ridges in a substantially V shape matching loci on a rake surface 7b of the stationary blade 7 of two adjacent linear ridges as a cutting part 6a of a rotary blade 6.</p> |
