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Short Head Cone Crusher Operating Recommendations

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Short Head Cone Crusher Operating Recommendations

June 26, 2023 nflg 0 Comments

The Short Head cone crusher is normally applied as a third stage crusher in plants designed for three of four stages of crushing. However, the wide range of crushing cavities available in the Short Head cone crusher permits its installation as a secondary crusher in many cases. The normal operating range for the Short Head cone crusher is to make a crushed product ranging from 1/8″ to 1″ in closed circuit.

It is considered sound crushing practice to affect a reduction ration approximately 4 or 6:1 in the Short Head crusher stage. Short Head cones may also be operated in open circuit where unusual screening and plant design conditions exist. Where extremely fine products are required, the Short Head cone prepares the feed for the Gyradisc crusher circuit where product sizes as fine as 20 mesh are produced.

The feed to Short Head cone crusher is normally screened to remove the finished product sizes and to provide void space for the crushed particles produced in the cavity. Maximum production will be obtained when the crusher operates at or near full load continuously. To achieve this condition, plant design, feed distribution and the type of crushing cavity are factors which warrant considerations.

The schematic arrangement shown in Figure A permits the crusher to operate with a controlled feed rate. The circuit shown in Figure A offers the optimum in crusher feed control and automation. The new feed is withdrawn from the bin directly to the crusher, assuring a steady, controllable feed rate. In a properly fed crushing cavity the material is distributed in a manner which utilizes the entire circumferential area of the receiving opening. It is equally important to have the finer gradations in the feed interspersed with the coarse feed.

To meet variations in feed size and produce requirements, the Short Head cone can be equipped with various designs of fine, medium, coarse and extra coarse crushing cavities.

In selecting the crushing cavity care is taken to obtain a design that will permit the topsize of the feed to enter the crusher in sufficient volume throughout the entire wear life of the liners. Since the most efficient crushing action takes place when the feed is reduced is a series of 4 or 5 blows as it passes through the cavity, it becomes important to select a design that will effect some reduction in the upper portion of the cavity as well as the lower or parallel sizing zone.

In other words, too large and opening for the feed will prevent crushing in the upper zones and can develop excessive power draw. Since the crusher feed rate is governed by the power draw, an incorrect cavity can reduce the crusher capacity and, on occasion, create unnecessary maintenance.

On the other hand, if the cavity will only accept the feed when the liners are new but as the liners wear the feed opening closes off reducing the feed rate, a more efficient cavity is required. Since no two crushing applications are exactly the same, a large number of cavity designs have become available through the years. Therefore, the optimum in cavity design is one which permits close to the rated power draw throughout the entire wear life and results in a scrap loss between 25 and 40 percent.

When the feed material is relatively non-abrasive, the crushing cavity selection is usually made to permit a condition where the entire cavity is filled up or “choked.” A certain degree of self-regulation takes place under these conditions.

When crushing a material which is both hard and abrasive, it is possible that the full motor power can be drawn without having the crushing cavity entirely filled or “choked.” As the crusher liners wear, the condition will develop where a “choked” cavity can be observed.

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