November 21, 2017

Caterpillar’s unveils ground-breaking continuous miner

cat rock straight system

After years of extensive research and development, global construction and mining equipment manufacturer, Caterpillar has unveiled what it touts the world’s first continuous mining and hauling system, Cat Straight System.

Specifically for underground hard rock applications, the Cat Straight System features a hard rock shearer that uses Cat-activated undercutting technology which has been designed for the extraction of bedded hard rock deposits.

Cat Straight System incorporates notable features for optimal performance and enhanced safety

Simultaneous cutting, loading and hauling

First, a low-profile hard rock chain conveyor and hard rock hydraulic roof supports complete the system, which delivers simultaneous cutting, loading and hauling—controlled by the Cat longwall automation system.

The system is designed to replace conventional drill-and-blast operations in low-heights environments, ranging from 1.3 m to 2 m, as well as in bedded deposits such as certain types of platinum, copper and gold deposits.

Reduced health and safety risks

Additional benefits of Cat’s Rock Straight System include reduced health and safety risks. The electrically powered rock cutter and hard rock conveyor have no exhaust emissions, and there is no need for explosives use in the production cycle.

More to the point, compared with conventional hard rock mining, fewer people are needed underground, while remote control places the operator in a climate-controlled cabin.

Reduced energy consumption and replacement cost


The undercutting machine, the HRM220, which depends on this Cat-activated technology, enables picks to attack the rock from an improved angle to exploit its tensile strength. The activation movement improves the velocity, momentum and impact of each pick while moving the pick away quickly to decrease wear and heating. The result is reduced energy consumption and the replacement cost of cutting tools.

Control, monitoring and protection


The HRM220 incorporates electronic modules that enable control, monitoring and protection of the miner.


Remote operation and diagnosis of major components can be done from the operator cabin through on-screen information.

Low-profile hard rock conveyor


Cat’s HRC30 hard rock conveyor’s newly developed apron face conveyor is low profile and designed to transport rock in low cutting heights.

Reduced wear


A single flight bar chain moves the apron pans across the length of the cutting face as they ride on the line pans. The apron pan system ensures reduced wear when moving abrasive rock.

The durable conveyor uses high-strength steel for long service life and reliable operation. Its haulage capacity is 160 t/h.

Two-legged shield


Meanwhile, Cat engineers designed the HRS1220 hard rock roof support specifically for the Rock Straight System.


Based on proven longwall roof support designs, the two-legged shield incorporates a solid base connected with an advancing mechanism on each side of the base.

The supports feature a working range of 1060 mm to 2155 mm with a yield load of as much as 2599 kN.

Enhanced roof support automation

Cat’s PMC-R electrohydraulic control system provides advanced roof support automation. It has proven to be flexible, reliable and productive in mines worldwide. In addition to improving productivity, the system also provides equipment monitoring and remote diagnostics.

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