Research on the Changing Rule of the Crushing Force of Jaw Crusher

AUTHOR: admin DATE: 29 Jul 2013 02:08:43

The distribution of the crushing force in the crushing chamber and the location and size of the resultant force are the important basis of structure design of jaw crusher and strength design of the spare parts. The distribution of the crushing force and the size and the location of the resultant force are random, so that through many times of industrial experiments on the small-sized pendulum jaw crusher and the statistic analysis of large amount of test data, we can get the changing rule of the crushing force in the crushing chamber.

The crushing load in the crushing chamber is the distribution load of the toothed plate and the resultant force is the crushing force. The distribution of the crushing chamber in the crushing chamber and the point of the resultant force of the crushing force of different types of crushers that are tested have similar moving rules along the height of the chamber in a movement cycle. In a crushing cycle, the crushing process happens in a space where the rotation angle of the main shaft is 60~240°and the rest is the discharging process. In the crushing process, the size and the location of the crushing force also change along with the rotation angle, and the peak of the crushing force is at the point where the rotation angle is 150~160°. The point moves along the end of the fixed jaw in the ranges of 0.2~0.48 times of height of the crushing chamber, which is to say, the point of the crushing force moves in the range of the 1/5~1/2 of the bottom of the height of the chamber. If H refers to the height of the crushing chamber, K refers to the height of the point of action of the crushing force in the crushing chamber, then K/H=0.2~0.24.

According to the changing curve of the crushing force along the rotation of the main shaft, the statistic of big peak is the crushing force with full load and also is the crushing force that happens the most times in the crushing process, and we call the maximum peak of the crushing force with full load as the biggest crushing force. The point of action of the maximum crushing force is about 1/3~1/2 of the bottom chamber height of the crushing chamber and the numerical value of the biggest crushing force will increase along with the decrease of the discharging mouth.

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