GNR PDK Series Primary Impact Crusher

The GNR PDK series primary impact crusher is a horizontal-shaft impactor (HSI) in which blow bars on the rotor throw material against the breaker plates, breaking it by free impact. On low-to-medium abrasive soft rock — especially limestone and concrete recycling — it gives very high reduction and cubical product in a single stage.

Technical data

Working principle

Blow bars on the high-speed rotor strike the feed, which shatters against the aprons/breaker plates (impact, not compression). The large inlet accepts coarse feed. Stage: primary, for soft-to-medium non-abrasive rock.

Material and application

Suitable: limestone (Ai~0.001–0.03), dolomite, soft-to-medium non-abrasive rock and C&D concrete recycling. Not suitable: granite, basalt, quartzite and river gravel with silica >10% / Ai >0.15 consume blow bars within hours; jaw+cone is preferred there.

Reduction and wear (TCO)

Reduction is very high: 4:1–6:1 in general, up to 20:1 on limestone (40:1 with twin rotor). The main wear part is the blow bar: high-chrome white iron (~700–800 HB) for clean high abrasion; tough manganese/martensitic against tramp iron in C&D; ceramic-insert MMC (~2-3× life) for very high silica. Correct alloy choice sets the cost per tonne.

The PDK is the primary machine of a complete limestone plant covering crushing, screening, washing and concrete batching, supplied from a single source.