The crushing force of jaw crusher is the collection of material crushing resisting powers which have random variation in crushing cavity. These material crushing resisting powers that are constantly changing and have random distribution are crushing forces of the jaw crushing. In terms of strength and power dissipation calculation, what are needed to measure are the magnitude of the crushing force and the places of its points of action. If measure the corner of bent axis and the transformation law of the crushing force change with corner in crank axis, we could use direct measurement and indirect measurement to measure the crushing force of jaw crusher.
1. Direct Measurement Method
Use four pressure sensors（also named pressure head）which are fixed on the walls in front of racks to jack up the fixed jaw plates through ball ring. in the middle of the working of crushing, the crushing resisting power in crushing cavity of materials spreads to four pressure heads through fixed law plate as well as ball ring in order to measure the strain signals of the pressure heads, and then it is possible to measure the magnitude of the crushing force as well as the places of points of action. This kind of measurement method has higher accuracy, but its defect is that when using direct measurement, it is needed to process specialized pressure sensors and their attachments and carry out demarcating at the same time. And it also repairs and machines the front wall to install pressure heads.
2. Indirect Measurement Method
This kind of measurement method is to measure the stress of some certain components and parts, and figure out the magnitude of the crushing force as well as the places of points of action. Its largest merit is that it doesn’t need to process specialized teat master copy, nor to repair or transform the jaw crusher. And indirect measurement method is divided into side wall stress determination as well as movable jaw toggle plate determination.
2.1 Side Wall Stress Determination
It could measure the side wall stress and its distribution and figure out the total tension force of side walls, which means the crushing force. And there is one set of resistor card on each side of the flanks. In addition, you also need to measure the stress of every measure point separately. And then draw up the distribution curve that the flank stress change with the height of the crushing cavity.
2.2 Movable Jaw Toggle Plate Determination
Measure the stress of toggle plate as well as several fracture surfaces of movable jaw. And convert it to the magnitude of the crushing force as well as the places of points of action according to the measured stress value. Under the circumstances of hard to install pressure heads under fixed jaw plate as well as impossible to determine the flank stress accurately, it is appropriate to adopt this kind of method.
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