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The 6HL-series High Efficiency Vertical Shaft Impact Crusher uses the cascade feed system to introduce a second stream of material in a controlled quantity into the crushing chamber turbulence,causing a supercharging of the particle population within the chamber,thereby improving the energy transfer between the particles.The rocks that enter the crushing chamber collide violently with the liners and move upward along the piling surface and then be crushed against the rocks spurted out by the impeller,loose energy and discharge from the crushing chamber.Cascade feed system offers external hydraulic adjustment of the cascade ratio while the crusher is operating to control the product specification and grading accurately.Adjustment can be hand operated or be fully integrated automated plant system.So it can adapt the changes of the feed specification and totally control the product quality and fines content.