These crushers are designed as two Double Roll Crushers with both the primary and secondary stage achieving a 4:1 reduction ratio. The intermeshing tooth design in the McLanahan crusher means that no timing gears are required.
By creating one machine to do the work of two, McLanahan has generated a lower overall headroom requirement and a simplified process flow. Quad Roll Crushers also feature hydraulic product size adjustment for both the primary and secondary crushing stages. This allows producers the option of changing size specifications or adjusting for wear if the need arises.
Quad Roll Crushers feature an automatic toggle relief mechanism for both stages. This allows the movable roll in both the primary and secondary stages to open, safely pass uncrushable material and return to its original setting for continued operation. In addition to the tramp protection feature, Quad Roll Crushers also include access doors for inspecting for wear or to facilitate roll maintenance. All V-belt and inter-stage drives are guarded for personal protection.
Standard-Duty Quad Roll Crushers are the lightest-duty Quad Roll Crusher and are designed to perform two-stage reduction on soft materials such as clean coal, salt, lime, coke, glass, etc. This model is powered by a single motor and features an inter-stage V-belt drive between the primary and secondary stages of crushing.
Medium-Duty Quad Roll Crushers perform two-stage reduction of materials such as salt, potash, harder coals that contain medium-hard shale and slate, and other minerals, but are not suitable for hard rock and other refuse. The Medium-Duty Quad Roll Crusher uses two motors to drive its four rolls and includes an inter-stage V-belt drive between the primary and secondary rolls.
Super Quad Roll Crushers perform two-stage reduction for ROM coal that contains moderate amounts of medium-hard refuse, as well as other materials of similar compressive strength. It is the heaviest-duty model of Quad Roll Crusher that McLanahan makes, but is not intended for very hard or abrasive rock. Designed for high capacity applications, the Super Quad Roll Crusher is capable of through-put up to 4,500 TPH and is available with dual or four motor drives depending on the application.
Abrasive Material Quad Roll Crushers have the ability to perform two-stage reduction of hot, abrasive feeds such as sintered iron ore and coke. This crusher has a number of features that limit the wear caused by abrasive materials and also simplify maintenance. These include abrasion resistant renewable side and end liners, as well as flanged shaft design to easily remove the primary rolls through the hopper and the secondary through the end plates. For hot feed options, McLanahan is able to provide water-cooled roll shaft assemblies, with bearings located outboard to dissipate heat and high temperature seals to protect the bearings.