How to calculate the main shaft speed of a jaw crusher

When the eccentric shaft of a jaw crusher turns once, the jaw swings back and forth once. Therefore, the eccentric shaft speed per minute is the number of oscillations of the jaw per minute. The eccentric shaft speed is one of the main performance parameters of a crusher. The speed directly affects the productivity, the specific power consumption and the content of over-crushed products.

From the test, it can be seen that the relationship between rotational speed and productivity, specific power consumption and the content of over-crushed products is as follows: under the given working conditions, the crusher productivity increases with the increase of rotational speed. When the rotational speed increases to a certain value, the productivity is maximum, after which the rotational speed increases again, the productivity drops sharply and the content of over-crushed products also increases. The change of specific power consumption is that before reaching the maximum productivity, the specific power consumption does not change much with the increase of rotational speed, but after reaching the maximum productivity, the power consumption increases sharply with the increase of rotational speed. In addition, the maximum speed of the eccentric shaft of the jaw crusher should be less than 430r/min.

It is exactly the same as the traditional formula for rotational speed, but it induces a very different premise, which is based entirely on the trajectory of the moving jaw and is fully in line with the actual situation of the motion of the jaws of the compound jaw crusher. In contrast, the results of the traditional derived formula are based on the parallel movement of the moving jaw, which is completely inconsistent with the actual motion of the moving jaw and differs significantly. It can be seen that the three parameters of rotational speed n, phasing angle a and swing stroke Sx are matched. When Sx is a constant value after the design of the mechanism, the value of spindle speed n changes with the value of tooth phasing angle a when the moving jaw compresses to the end.

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