Types of Secondary Rock crushers
Rock crushers are used to break down rocks. They have applications in several different industries, including mining , where they are used to prepare ores for processing, and construction, where they are used to create rock fill material for landscaping or erosion control. Rock crushers come in two major types, primary and secondary. Secondary crushers work with smaller pieces of rock that have already been broken down from their original size. Several types of secondary rock crushers are available.
Gyratory crushers are often used as secondary crushers. Gyratory crushers operate by pressing between two components–an eccentrically-gyrating spindle and an enclosing concave hopper. The spindle is covered by a wear-resistant mantle that keeps it durable. The rock is continuously pressed as it works its way down the crusher, until it’s small enough to fit through a narrow opening in the crusher’s bottom.
Cone crushers are also frequently used as secondary crushers. Cone crushers work in a way very similar to a gyratory crusher . However, the crushing chamber in a cone crusher isn’t as steep as it is in a gyratory crusher and the positions of the different crushing zones is more parallel. The general concept of how a cone crusher works is very similar to an orange juicer. The central cone spins and the walls are tapered, so gravity presses the rock against the wall until it escapes through the opening at the bottom.
Roll crushers are also frequently used as secondary crushers. The name roll crusher is indicative of the way in which a roll crusher works. The rock is run between two large steel wheels, which presses down on it, crushing it into a smaller size.
Impact crushers are used as primary and secondary crushers, depending on the nature of the material in the application. Impact crushers operate by feeding the material into an inner chamber, where it is beat on by large hammers. The material stays inside the chamber until it’s at the proper size to fit through the discharge outlet. Impact crushers come in two major sub-types–horizontal shaft impact, or HIS, crushers and vertical shaft impact, or VSI, crushers. HIS crushers use hammers that swing on a rotating shaft, while VSI crushers “throw” the material against a surface, using the rock’s velocity to break it apart.