GNRK Series Jaw Crusher (Primary)

The GNRK series jaw crusher is a primary crusher that breaks rock by compression between a fixed jaw and an eccentric-driven swing jaw. It reduces coarse run-of-mine (ROM) feed to a manageable size in the first stage of the plant.

Technical data

Working principle

The cavity is wide at the top and narrows downward. The swing jaw oscillates on the eccentric shaft; material is progressively compressed and discharges by gravity through the CSS (closed-side setting). The stage is primary only; GNRK 900/1100 are narrow-opening secondary variants.

Material and application

Because it works by compression, the jaw crusher handles material above the abrasivity threshold (silica >10% or Bond Ai >0.15): granite, basalt, quartzite, river gravel and slag. Wet, sticky clay feed clogs the cavity and should be washed or scalped first.

Reduction and wear (TCO)

Typical reduction is 4:1–9:1 (up to ~8:1 in primary duty). Maximum feed is about 0.8–0.9 of the opening width. The main wear part is the jaw plates in austenitic manganese steel (Mn13/Mn18), which work-harden under impact; Mn18/Mn22 for high silica. Compression keeps metal wear and cost per tonne low.

The jaw crusher is the entry machine of a complete plant covering crushing, screening, washing and concrete batching, which we can supply from a single source.