Jaw crusher specification is feeding width B and length L to represent . Jaw Crusher For example , 900 × 1200 mm jaw crusher represent it to the mine mouth width of 900 mm and a length of 1200 mm .
Feed opening width of the device , the device can be divided into large , medium and small three types . Feed opening width is greater than 600 mm for large , feed opening width of 300 to 600 mm for the medium , feed opening width of less than 300 mm are small-scale . Impact Crushers
 Production fed into the jaw crusher to the ore block greatest degree than feed opening width B is 15 to 20%, ie feeding largest block of D max = 0.85 ~ 0.8B.