The crushing chamber of the gyratory crusher generally has three forms: 1 a short curve with a decreasing angle at the discharge port, but the bit angle decreases slowly, the position of the blockage point is still near the discharge port, and the blockage phenomenon is improved. . It is used when the width of the discharge opening does not need to be adjusted very small, such as a coarse crusher with a discharge opening greater than 150 mm. 2 A slightly longer curve is formed at the discharge opening, and the angle of the cut is faster, the blockage point is moved up, and the blockage phenomenon is greatly improved. It is used in crushers with a discharge opening of less than 150 mm. 3 There is a large range of curved section crushing cavity above the discharge opening, and the surface of the moving cone lower lining is bent into a longer quasi-parallel zone. This type of cavity is used for medium and fine crushing gyratory crushers. However, if the ore is extremely hard, the lower curved section of the moving cone is quickly worn away and cannot meet the requirements of the size of the discharge opening. Therefore, the choice of cavity type is not only related to the use and specifications of the crusher, but also the physical properties of the ore. For materials containing more soil and moisture, it is not advisable to use a cavity with a longer parallel zone.
Secondly, the theoretical analysis of the crushing cavity is carried out to find out the variation law of the productivity of each horizontal section along the height of the crushing cavity. According to the curve of the productivity of the gyratory crusher along the height of the crushing chamber, the productivity of each section of the crushing chamber of the crusher varies from top to bottom along the height of the crushing chamber, and the productivity is the largest at the upper middle section, and the discharge port section is the largest. The productivity is minimal. As the size of the crusher increases, the difference between the lower section of the crushing chamber and the maximum productivity of the upper section is also larger. The lower curved cavity shape moves the plugging point up, reduces the blockage of the discharge port, and improves the crusher productivity. The difference between the feeding and discharging of the crushing chamber of the 500/75 crusher is the smallest, and the variation along the height is also small.
In summary, when designing the crushing cavity of the gyratory crusher, it is necessary to follow a rule that when the crushing ratio is constant, the meshing angle is decreased to increase the productivity, and the height of the crushing cavity is also increased; on the contrary, increasing the meshing angle reduces the productivity. The crushing height is also reduced. That is to say, the design must ensure the crushing ratio of the crusher, and the height of the crushing chamber does not increase.
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