Marcy Double Roll Crusher, 6.5 x 6in, Max. Feed 3,000 lbs

Marcy Double Roll Crusher, 6.5 × 6 in

Max Feed Capacity: 3,000 lb/hr

Overview

The Marcy 6.5 × 6 in Double Roll Crusher is a heavy-duty size reduction machine designed for single-pass crushing of medium-hard to hard materials such as rock, ore, minerals, and coal. It is ideal for laboratory and pilot-plant sample preparation, producing consistent, controlled particle sizes suitable for further fine grinding or analysis. 

This crusher reduces feed material through shear and compression forces generated between two counter-rotating rolls. Output size is controlled by adjusting the roll gap with a single hand lever, allowing operators to achieve repeatable and uniform results. 

Explore more types of crushers in the Crushers category for your lab or plant needs. 

How the Double Roll Crusher Works

Material is fed into the crushing chamber where it is drawn between two synchronized rotating rolls. The combination of impact, compression, and shear fractures the particles, with the crushing action confined to the controlled gap between the rolls for consistent size reduction. 

A floating roll mechanism allows the crusher to pass uncrushable material safely, reducing the chance of damage or choking. Relief springs absorb overload forces, protecting internal components and maintaining reliability. 

Size Reduction Performance

• Maximum feed size: 0.5 in (13 mm)
• Typical final size: Minus No. 10 (2 mm), depending on material
• Throughput: Up to 3,000 lb (1,361 kg) per hour
• Reduction method: Single-pass crushing

This roll crusher is especially effective as a secondary crusher or for sample preparation prior to pulverizing, where uniform feed size is critical. 

Construction & Design

• Fabricated steel construction for long service life
• Base-mounted design for stability
• Tilt-style feed hopper with high capacity
• Electrical safety interlock that shuts off power when the hopper is opened
• Fully guarded drive and crushing components
• Ni-Hard roll facings for extended wear resistance
• Heavy-duty pillow block bearings
• Self-aligning spherical roller bearings

The integrated crushing plates and roll interaction ensure consistent reduction while minimizing uneven wear. 

Technical Specifications

• Roll Size: 6.5 × 6 in (165 × 153 mm), Diameter × Width
• Roll Material: 304 stainless steel with Ni-Hard facings
• Motor: 2 hp TEFC
• Drive: V-belt
• Electrical: 230V or 460V, 3-phase, 60 Hz (must be specified at time of order)
• Operating Speed: Uniform throughout crushing cycle
• Dimensions: 50 × 38 × 32 in (127 × 97 × 81 cm), W × D × H 

Key Features

• Single hand-lever gap adjustment
• Uniform roll speed for consistent product size
• Floating roll protection against uncrushable material
• Safety interlock and full guarding
• Low horsepower requirement for heavy-duty output
• Designed for continuous operation 

Applications

• Mining and mineral processing
• Cement and aggregate sample preparation
• Coal and limestone crushing
• Power generation fuel preparation
• Construction materials testing
• Recycling and industrial material processing

Double roll crushers are especially well-suited where uniform particle size and low fines generation are required. 

Explore related sample prep crushers like the Marcy Gy-Roll Lab Cone Crusher, 6 in for finer reduction needs. 

Advantages of Roll Crushers

Compared to jaw or cone crushers, roll crushers offer:

• Better control over final particle size
• Lower fines generation
• Lower power consumption
• Efficient handling of medium-hard materials

They are commonly used in secondary crushing stages where feed size is already controlled. 

Operation & Safety

The crusher is designed for safe and straightforward operation with:

• Simple start/stop controls
• Emergency shutdown capability
• Floating roll design to protect equipment
• Fully enclosed crushing and drive components

Operators should follow standard safety procedures, including proper PPE and routine inspections, to ensure long-term safe operation. 

Maintenance & Reliability

• Replaceable wear surfaces for extended service life
• Self-aligning bearings reduce maintenance requirements
• Easy access to crushing chamber for cleaning
• Regular lubrication and inspection maintain peak performance

With proper maintenance, the Marcy Double Roll Crusher delivers long service life with minimal downtime. 

Troubleshooting Overview

• Uneven roll wear: Check alignment and feed consistency
• Excessive vibration: Inspect bearings and mounting hardware
• Choking or blockage: Reduce feed size or remove uncrushable material

Routine inspection and preventive maintenance will eliminate most operational issues and ensure efficient operation.