Hard Rock Cone Crusher Production Line QST1200 QST1800
Closed-loop two-stage crushing and screening for granite, basalt and iron ore.
This hard rock crushing line is built around a two-stage closed loop: a coarse crusher prepares the stone, and a cone crusher performs secondary fine crushing and shaping by laminated compression. Automated feeding delivers large raw stones at a constant rate so downstream units never run blocked or overloaded. Crushed material travels by belt conveyor to a vibrating screen, where it is split into graded aggregates, and oversize stone returns automatically to the cone crusher for re-crushing. The result is high raw material utilisation and a finished product with a controlled particle shape and low flakiness content. Discharge size can be adjusted manually, so a single line can serve several aggregate specifications. The equipment handles hard and abrasive rock such as granite, river pebbles, basalt and iron ore, and it is aimed at medium and large sand and gravel plants that need steady daily output. Typical duties include aggregate processing, road construction, building material production and concrete product manufacturing.
Configured around output, blocks and operating conditions.
Two-stage closed loop combining coarse crushing with cone fine crushing and shaping in one circuit., Automated feeder delivers raw stone at a constant rate to prevent overloads and blockages downstream., Laminated compression cone crushing produces cubical aggregate with low flakiness for engineered grades., Vibrating screen classifies material and returns oversize stone automatically for re-crushing., Manual adjustment of discharge size lets one line produce several aggregate specifications., Built for abrasive rock such as granite, river pebbles, basalt and iron ore in continuous duty.
Typical decision factors
What changes the machine price?
Daily capacity
Output target determines machine size, mould cycles and line configuration.
Automation
Pallet handling, cubing, batching and packaging change total project scope.
Block types
Hollow block, paver, interlock and curbstone may require different moulds and handling.
Service scope
Shipping, installation, training and spare parts are quoted by destination.
What This Production Line Does
The line is a complete crushing and screening system for high-hardness stone. It takes run-of-quarry rock such as granite, river pebbles, basalt or iron ore and turns it into graded aggregate in a closed loop. Because the flow is two-stage, coarse followed by cone fine crushing, hard and abrasive material can be reduced in fewer passes and with less wear on any single unit.
Working Principle
An automated feeder releases large raw stones at a constant rate and in measured quantities into the coarse crusher, which protects everything downstream from sudden overloads and blockages. The partly crushed stone then moves by belt conveyor to the cone crusher, where it is shaped and reduced again under laminated compression. From there the material enters a vibrating screen for multi-layer classification. Stone that meets the required size leaves as finished aggregate, while oversize material is carried back by a return conveyor and re-crushed, so almost nothing is discarded.
Adjustable Output and Closed-Loop Recovery
Discharge particle size is set manually on site, which lets one installation produce several aggregate grades without adding equipment. The return loop keeps quality consistent from shift to shift, because any off-spec stone is simply cycled again instead of being sold as waste. Operators see a streamlined workflow with few transfer points, which keeps running costs and downtime low compared with conventional multi-unit crushing setups.
Why Two Crushing Stages
Hard rock breaks predictably under compression, which is why the line uses a cone crusher for the fine stage rather than relying on a single unit. A single pass over granite or basalt tends to leave a flaky product with a poor grading curve and puts heavy wear on hammers and liners. Working on the laminated compression principle, the cone squeezes stone grain against grain between a moving mantle and a fixed bowl, so the finished material is cubical and evenly graded. Combining that with a coarse stage upstream and a screen with a return loop downstream gives the circuit a stable product curve that is easy to control.
Where It Fits
Medium and large sand and gravel enterprises use this configuration as their main crushing circuit. It also suits road construction projects that need engineered aggregate, building material plants, and concrete product manufacturers who want a dependable, self-contained supply of graded stone. For quarry operators working hard rock, the combination of a cone crusher and an automatic return loop is usually the most economical route to a uniform finished product.