The calculation method of the selection function can be seen from the working process of the jaw crusher. The material passes through several crushing zones in the crushing chamber. The shapes of these crushing zones are similar, but the sizes are different, due to the dynamics of the jaw crusher. The stroke is small compared to the feed width, so it can be assumed that the upper and lower strokes of the moving jaw are the same, ie the angle of the fillet is constant during operation. Therefore, the cross section of each fracture zone can be seen as a similar trapezoid and gradually decreases from top to bottom. The jaw crusher has different specifications, and the size and number of crushing zones are also different. Since the discharge of the jaw crusher is based on its own gravity, all the feedstocks have a tendency to move toward the discharge opening. Since the crushing chamber is trapezoidal, each grade of material larger than the width of the discharge opening is blocked after entering the equipment. Remaining in the crushing chamber, in each crushing zone, the material whose size is larger than the small side of the trapezoidal area and smaller than the large side is crushed by the pressing of the seesaw, and the material smaller than the small side of the trapezoid is obtained. Squeeze to the seesaw. Therefore, the materials in the pulverizing chamber have different pulverization chances. So, what is the probability that the material will be crushed? First of all, it is related to the particle size of the material. When the particle size is smaller than the width of the discharge port and enters the crushing chamber without any interference, the material will be discharged directly from the discharge port, and certainly cannot be crushed. The particle size distribution of the pulverized material is related. Obviously, when there is only one piece of material and its size is larger than the size of the discharge port, the probability of the material being pulverized must be 100%. When materials with different particle sizes enter the equipment, due to the material Mutual influence, the probability of being crushed will be different, it is related to the specifications of the equipment.
The largest particle size in the feed particle size is 340 mm, which corresponds to the fifth region of the comminution zone. Therefore, the jaw crusher divides the effective crushing zone of the material into N=22-5=18 pieces. The feedstock is also divided into 18 grain sizes, and the size range corresponds to the division of the crush zone to a simple calculation. When two adjacent grain sizes are combined into one, the grain size is divided into 9 pieces, and the corresponding particle size distribution is expressed. Compact, the elements in the selection function are gradually reduced according to the size of the grain size, that is, the probability of the large particle material being crushed is large, and the probability that the small particle material is crushed is small, which is in line with the jaw crusher selection of the material. The objective law of sexual smashing. The calculation of this selection function is a calculation method for the jaw crusher operation. Moreover, for the material entering the first pulverization zone, the particle size of the material after the first pulverization zone has changed, and this change is related to another function rupture function B in the pulverization theory.
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