| 摘要 |
PROBLEM TO BE SOLVED: To curtail a time for crushing an object to be treated and to crush the object more finely by providing a step part formed in the shape of a stair toward the center side of a crushing chamber upward in the inside wall of the crushing chamber. SOLUTION: A step 13 (upper position) for coarse crushing and a step 14 (lower position) for fine crushing are formed on the inside wall of a hopper on the side of a crushing chamber 3. The steps 13, 14 are formed in the shape of a stair toward the center side of the chamber 3 upward. An uneven part 15 is formed on the lower surface of the step 13. The uneven parts 15 can be formed on the inside surfaces of the steps 13, 14. In this way, when an object 20 to be treated is crushed finely, the object 20 is shot upward on the peripheral side of the chamber 3 by rotary blades 8 to collide with the step 13 and to fall so that the object is crushed efficiently. The object 20 is crushed by the uneven part 15 to improve crushing efficiency. The object 20 which was crushed into pieces of a certain size is caught by the step 14 to be crushed by the collaboration of the rotary blades 8 and fixed blades 9. |
