Main parameters of hammer crusher
(1) The rotational speed of the rotor. The rotor speed of the hammer crusher is determined according to its required line speed, and the linear speed of the hammer is determined according to factors such as the nature of the ore, the size of the product, and the amount of wear of the hammer. Usually selected within 35~75m/s. When coarsely crushed, it is generally selected within 15~40m/s; when finely crushed, it is selected within 40~75m/s. The higher the linear speed of the rotor, the larger the crushing ratio, but the greater the wear and power consumption of the hammer. Therefore, under the premise of meeting the product granularity requirements, the line speed should be chosen to be low.
(2) The diameter and length of the rotor. The diameter of the rotor is determined by the feed size and throughput. Typically, the diameter of the rotor is 2-8 times the maximum feed size. The ratio of the diameter to the length of the rotor is generally 0.7 to 1.5. When the amount of processing required is large and the material is difficult to break, the maximum value should be selected.
(3) Hammer quality. The quality of the hammer has a great influence on the crushing effect and energy consumption. If the quality is too small, the material may not be broken, or the hammer is tilted backwards when hitting the material, and the crushing effect is deteriorated; if the mass is too large, the energy consumption is increased, and the number of hammers is reduced in the same space. Therefore, the quality of the hammer head should be sufficient to crush the material, so that the useless power consumption reaches a minimum, and at the same time, the hammer head is not excessively tilted backward when impacting the material.
There are two methods for calculating the mass of the hammerhead. One is calculated based on the kinetic energy generated by moving the hammerhead equal to the crushing work required for the crushed material; the other is calculated based on the principle that the kinetic energy of the collision theory is equal. Usually 0.7-1.5 times the mass of the largest feedblock is selected.
(4) Productivity. At present, there is no theoretical calculation formula for the productivity of hammer crushers considering various factors. Generally, it is obtained by referring to the manufacturer's product catalog, production practice data or empirical formula. The empirical formula often used is as follows:
Q=KDLδ(t/h)
In the formula, K——experience coefficient, for medium hardness materials, take K=30-45, take the upper limit when the equipment specification is larger, and vice versa; for coal , take K——130~150; D— - diameter of the rotor (m); L - length of the rotor (m); δ - bulk density of the material (t/m3).
(5) The power of the motor. The power of the motor depends mainly on the nature of the material, the linear speed of the rotor, the crushing ratio and the production capacity. Currently, it is usually calculated according to the following empirical formula:
P=KQ(kW)
Where Q is the capacity of the crusher (t/h); K - specific power consumption (kW / t); for medium hardness limestone K = 1.4-2; coal taking K = 0.8 ~ 1.5; coarse crush When the time is small, it is too small.
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