excessive shock loading and may result in seriousdamage to the crusher.All hydrocone crushers are supplied with a feedhopper with an adjustable feed spout that is adjustableboth vertically and horizontally. Horizontal adjustmentof the spout is accomplished by moving the adjustablefeed spout frame on the feed hopper. Slotted holes in theupper flange of the feed hopper, and in the feed spoutframe, allow the feed spout to be moved horizontally inorder to position it properly over the feeder plate orspider cap. The feed spout can be positioned verticallyby using studs and adjusting nuts to fasten the spout tothe frame. The vertical position of the spout controls theamount of feed going into the hydrocone crusher.Adjustable feed spout frame construction allows themounting of a suitable feedbox. Normally, it is better tohave the incoming feed hit the side of the feedbox, afterwhich it falls vertically through the feed spout. This isthe most effective way of obtaining proper feed to thehydrocone crusher (fig. 6-8).The discharge arrangement setup must allow thematerial to discharge freely without backing upunderneath the crusher. Material backing up below andinto the hydrocone crusher can result in serious damageto the machine.A straight-down discharge is commonly used withhydrocone crushers. With this arrangement, crushedmaterial falls into a stone box below the crusher.Material passes through a hole in the stone box flooronto a conveyer belt that carries it away. This dischargearrangement helps prevent buildup of sticky materialsbeneath the crusher.The crushing chamber is annular (ring shaped).Rock fed into the top falls between the cone andthe mantle and is crushed as the opening narrows withthe movement of the cone. When the opening widensagain, the pieces fall farther, to be crushed againas the cone gyrates. The crushing action is similar tothat of a jaw crusher, except the squeeze comes from theside rather than from the bottom and the curve of thejaws.The cone speed and the distance of travel mustbe carefully synchronized. A wide space allowspieces to fall more freely than a narrow one when thecone is moving slowly; however, it allows pieces to falltoo far before the next impact. On the other hand, wherethe space is narrow and the cone is moving rapidly,the pieces cannot fall far enough and this causesproduction to be low for the amount of power beingused.CAUTIONDO NOT operate the cone crusher at asmaller setting than that for which it wasdesigned. Operation at too small a dischargeFigure 6-8.-Recommended cone crusher feed arrangement.6-7
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