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The Stress Analysis of Jaw Crusher’s Main Components

Jul 24 2014

In all parts of the jaw crusher, the jaw plate, eccentric shaft, mainframe, and bearing are the main components that have a high requirement to their strengths. That is because these components need to bear big forces during operation. This article will explain you the stress analysis of jaw crusher’s main components:

The jaw plate

The force suffered by the jaw plate is not only affected by the situation of the feeding, but also affected by the eccentric shaft’s speed. Through the force distribution analysis of the jaw plate, we find that its force distribution has some similar characteristics: its intermediate horizontal force is large and the middle part is the largest. While its sides’ are small, and symmetrical.

The eccentric shaft

The biggest stress of the eccentric shaft is at the edge of shaft. The stress is low at the ends of the eccentric shaft. The stress of the axis segment between the two rod bearings is large, and the distribution of the circumferential direction is oval type, which proves that the jaw crusher’s work process suffers pulsating cyclic stress.

The mainframe

The force suffer by the mainframe mainly includes the pressure of the materials, the force from the eccentric shaft, the force from the toggle plate to the toggle seat, and its own gravity. In actual operation, the crushing force is mainly on the front wall and the seat brackets, and forces of the other direction are negligible.

The bearing

Jaw crusher’s bearing not only bears large axial shock loads, but also bears certain radial shock loads. Therefore we usually use the double row spherical roller bearing with self-aligning performance and large capacity. We only calculate crushing force as its suffering load. Because its inertial force, gravity, and driving force is very small, so we just neglect them.

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