How to calculate the spindle speed of the jaw crusher
The eccentric shaft of the jaw crusher rotates once, and the movable jaw swings back and forth once. Therefore, the rotational speed of the eccentric shaft per minute is the number of swings of the movable jaw per minute. The speed of the eccentric shaft is one of the main performance parameters of the crusher. The speed directly affects the productivity, specific power consumption and the content of the over-crushed product. Therefore, the speed is the main factor for the economic operation of the crusher.
It can be seen from the experiment that the relationship between the speed and the productivity, specific power consumption and the content of the over-crushed product is as follows: under the given working conditions, the productivity of the crusher increases with the increase in the speed. When the rotation speed increases to a certain value, the productivity is at its maximum, and then the rotation speed increases again, the productivity drops rapidly, and the content of the over-crushed product also increases. The change in specific power consumption is that, before the maximum productivity is reached, the specific power consumption changes little with the increase of the rotation speed, but after the maximum productivity is reached, the power consumption increases sharply with the increase of the rotation speed. In addition, the maximum speed of the eccentric shaft of the jaw crusher should be lower than 430r/min.
Calculation of the spindle speed: If the material is discharged in free fall, the spindle speed n is:
① If a=a1+a2
The formula ① is exactly the same as the traditional formula for seeking speed, but the premise of its induction is completely different. It is obtained completely according to the motion trajectory of the movable jaw, which is completely in line with the actual situation of the mobile jaw movement of the compound pendulum jaw crusher. However, the result of the traditional seeking formula is based on the parallel movement of the movable jaw, which is totally inconsistent with the actual motion feeling of the movable jaw, and is quite different. And according to the formula ①, the three parameters of the speed n, the angle a and the swing stroke Sx are matched. When the Sx is a fixed value after the mechanism is designed, the spindle speed n value changes with the change of the tooth surface angle a when the movable jaw is compressed to the end point.
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