diagram of roll crushers

Mechanical structure of roller crusher. Roller crusher is widely used in solid and block material pulverizing. Roll gap between the rollers is usually adjusted to satisfy the particle size of output material. In order to realize convenient adjustment, a roll gap control scheme based on electro-hydraulic technology is designed and optimized.

Principal of Smooth Roll Crushers: Size reduction is achieved by compression (i.e. it employs compressive force for size reduction). A smooth Roll crusher consists of two heavy metal rolls of the same diameter placed side by side each other in the horizontal position. The rolls are rotated towards each other at the speed.

The document discusses different types of roll crushers used in size reduction processes. It describes how roll crushers work by compressing materials between two rotating rolls to fracture them into smaller pieces. The key types are single roll, double roll, smooth roll, and toothed roll crushers.

Roll crushers consist of two or more adjacent rolls placed parallel to each other and rotated in opposite directions. Single roll crushers are also available which rotate a single roll against a fixed breaker plate. Mineral or rock particles placed between the rolls are nipped and then crushed as they pass between the rolls.

Figure 6.4 is a typical set-up where ores crushed in primary and secondary crushers are further reduced in size by a rough roll crusher in an open circuit followed by finer size reduction in a closed circuit by a roll crusher. Such circuits are chosen as the feed size to standard roll crushers normally does not exceed 50 mm.

Rock particles are usually fed through a chute designed to distribute the charge evenly along the width (length) of the roll. About two-thirds of a roll–width is active. As in any crusher, particle sizes less than the distance between the rolls tend to pass through uncrushed.