The choke-point in a crushing chamber is that level in the chamber where the capacity of the crusher is a minimum that is, it is the bottle neck of the crushing chamber. If the voids are filled too soon the material will no longer compress but will instead pack against the walls. Material entering the crusher must contain a certain minimum amount of void space to be largely filled as the material is broken and reaches the choke zone. The volume in the crushing cavity decreases with depth in the crusher until the choke zone is reached. This can happen due to physical blockage from underneath, or when there are too many fines present. When so caused, packing precedes and brings about the choke-up.Ĭhoking refers to a stoppage in the downward flow of rock in the crushing chamber. Or choking may be the result of a condition existing within the crushing chamber, such as too close a discharge setting, too many fines in the feed, or sticky material. It may be the result of an external condition, such as a “backup” of material occasioned by an obstruction in the discharge chute, in which case choking is followed by packing in the crushing chamber. Inasmuch as these terms are used rather loosely, and with a considerable degree of freedom as to their exact meaning, it is desirable to define a few of the more important ones to make clear the sense in which they will be used in this work.īlocking means the blockading of the crusher receiving opening by a piece of rock or ore that is too large to enter the crushing chamber in any position.īridging means the blockading of the receiving opening by one or more pieces, any of which are small enough to enter the crushing chamber, but which are prevented from doing so, either because they fall so as to span the opening, or so that they mutually block each other from entrance.Ĭhoking means a complete, or practically complete, stoppage of the downward flow of material in the crushing chamber. There are Crushing Industry Terms, Vocabulary as well as a number of expressions, peculiar to operation of rock crushing plants, have come into common usage among crusher designers and operators.
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