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Main parameters of roller crusher
1. The angle of the double-roller (glossy) crusher is assumed to be a spherical shape. The contact point between the ore and the two rollers is respectively tangent, and the angle between the two tangent lines is the angle of the double-roller crusher. Its value is generally selected between 33°40′~38°40′.
2. Feeding particle size and rotor diameter In general, the diameter of the smooth roll crusher should be equal to about 20 times the maximum feed size. This type of crusher is usually used for medium and fine crushing of ore. The ratio of the rotor diameter to the feed size of the tooth surface or grooved roller crusher is smaller than that of the smooth surface crusher. The general tooth surface is 2~6; the groove surface is 10~12. This type of crusher can be used for limestone or coal. Crushed.
3. Roller speed The roller speed of the crusher is related to the surface characteristics of the roller, the physical properties of the material and the particle size of the feed. Generally, the larger the feed size and the harder the ore, the lower the rotation speed of the rolls. The rotational speed of the tooth surface or grooved roller crusher is lower than that of the smooth roller crusher. Since the production capacity of the crusher increases in proportion to the rotational speed of the roller, in recent years, a high-speed crusher has been preferred. However, the increase in speed is limited. Generally, the peripheral speed of the smooth roller is 2 to 7.7 m/s, and the limit is 11.5 m/s; the circumferential speed of the tooth surface or the grooved roller is 1.5 to 1.9 m/s, and the limit is 7.5 m/s. .
4. Productivity The productivity of the roller crusher Q can be calculated as follows:
Q=188.4eLDnμδ(t/h)
Where e - discharge opening width (m); L - roller length (m); D - roller diameter (m); n - roller speed (r / min); μ - ore loose coefficient , for medium hard ore, μ = 0.2 ~ 0.3; wet ore and wage ore production = 0.4-0.6; δ - loose density of ore (t / m 3 ).
When crushing hard ore, its productivity can be calculated by increasing the formula by 25%.
5. Motor power The motor power P of a smooth roll crusher (processing ore below medium hardness) can be calculated according to the following empirical formula:
P=(100~110)Q /0.735en(kW)
Where Q - productivity (t / h); e - discharge opening width (cm); n - roller speed (r / min).
The motor power of the toothed roller crusher can be calculated as follows:
P=KLDn(kW)
Where K is the coefficient, when the coal is broken, K = 0.85; L - the length of the roller (m); D - the diameter of the roller (m); n - the rotational speed of the roller (r / min).