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The Stress Analysis of Jaw Crusher’s Transmission Mechanism

Jul 24 2014

Jaw crusher’s transmission mechanism is mainly composited of the eccentric shaft, the pull rod, the crank, and the toggle plate. Eccentric shaft is installed on the main bearing at the side wall of the frame. When the eccentric shaft rotates, it drives the pull rod to make a up and down reciprocating motion, so that the two brackets also come to reciprocate, thus promoting the movable jaw suspended in the shaft reciprocating, so the materials in the crushing cavity are crushed because of squeezing. In the crushing process, what powers do these components bear? Let’s have a specific understand about the stress analysis of jaw crusher’s transmission mechanism in the following parts:

The eccentric shaft

The eccentric shaft, as the jaw crusher’s driving torque and bending moments, has a quite complicated force situation. According to the traditional theoretical, calculate the unknown load according to the equilibrium condition after obtained the partial load. Then draw the bending moment and torque diagram for each shaft section. At last evaluate the eccentric shaft depending on the strength check theory. Theoretical calculations can calculate the stress level of the eccentric shaft’s each segment, but, there is a gap between the calculation results and the true value due to the use of a simplified algorithm. When the jaw crusher is working, the force of the eccentric shaft’s support point is determined by the jaw crusher’s structure and the crushing force. Its forces and moments are changing, and where there is the maximum force, there is the maximum point.

The pull rod

In the process of crushing, the crushing occurs at spindle’s corner position between 60-240 degrees. The crushing force and the force point are changing according to the spindle’s corner position, and the force point of the peak crushing force is at the 2/5 of the lower crushing chamber.

The crank

The drive mechaism of the jaw crusher is a typical crank rocker mechanism. In the transmission process, the crank bears the force from the eccentric shaft and constraint force from the moving frame and the deputy campaign hinge.

The toggle plate

As the toggle plate has angular velocity and acceleration, it also generates the inertial forces and moments of inertia in the course of the campaign. However, due to the toggle plate’s gravity, inertia force, and moment of inertia are small compared with other moving components, they are generally not considered in the force analysis. We only consider the constraint force from the moving hinge.

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