2.Reduce the weight of the swinging jaw plate by attaching stiffeners to the jaw plate along its width. 4.5.1 Applying Boundary Conditions Since one end of the pitman is hinged to the eccentric shaft and other end is connected is to the toggle plate. Fig4.10 represents the boundary conditions applied to the assembled structure. Fig.4.9 Property on the constraint Fig.4.10 Boundary conditions to the pitman
58 Optimization of toggle plate width & location: While the material is nipping in the crushing chamber toggle supports the swinging lever at bottom end it means toggle plate is more affected during the crushing. So it is necessary to optimize the toggle plate dimensions and location of the toggle plate along the pitman. 4.5.2 Analysis for Optimizing the Toggle Plate Width: Analysis is performed for assembled structure of swinging jaw plate with swinging lever for a conventional single toggle jaw crusher with constant toggle plate thickness and length. And the width of the toggle plate is considered at 100, 200, 400, 600, 800, 900mm. It is observed that as the width of the toggle plate increases Von Misses stress as well as displacements in the structure decreases. Table4.2 represents how the Von Misses stresses and displacements are varying with toggle width. Fig.4.11 Toggle Plate of the jaw crusher Width of the Toggle Plate(mm) 100 200 400 600 800 900 Von Misses Stress(N/mm2) 447 246 188 137 98.6 97.7 Displacement (mm) 0.311 0.262 0.212 0.18 0.164 0.16 Table.4.2 Von Misses stress and displacements at various sizes of the Toggle Plate widths. By observing graph shown in Fig.4.12 between Von Misses stress and toggle plate width at the width of 800mm, the curve reaches to an asymptotic value of 98.6 N/mm2. The displacement curve for various toggle plate width is shown in Fig.4.13. So the optimal value of
the toggle plate width can be98.6N/mm2and 0.164mm respFig.4.12 Vonmisses stresses vFig.4.14 to Fig.4.19 restrcture when the width of theFig.4.14 Von Misses St050100150200250300350400450500100200400N/mm2N/mm2mmmm59 e taken as 800mm and the Von Misses stresspectively. vs toggle plate width Fig.4.13 displacemewidth epresents the Von Misses stress and displaceme toggle plate is considered at 100, 200, 400, 6tress and Displacements for the Toggle plate w60080090000.050.10.150.22.214.171.124100 200 400s and displacement are ents vs toggle plate ment of the assembled 600, 800, 900mm. width of 100mm 600 800 900mm
60 Fig.4.15 Von Misses Stress and Displacement for the Toggle plate width of 200mm Fig.4.16 Von Misses Stress and Displacement for the Toggle plate width of 400mm
61 Fig.4.17 Von Misses Stress and Displacement for the Toggle plate width of 600mm Fig.4.18 Von Misses Stress and Displacement for the Toggle plate width of 800mm
62 Fig.4.19 Von Misses Stress and Displacement for the Toggle plate width of 900mm or throughout the width of the swinging jaw plate. 4.5.3 Anlysis for Optmizing the Toggle Plate Location: Analysis has been performed ,locating the toggle plate at position of 0, 50, 100, 150, 200, 250, 300mm form bottom surface of the pitman. Fig.4.20 & Fig.4.21 shows the VonMisses stress
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