Overview

The document provides technical information and specifications for the MDRC 5 Down-The-Hole (DTH) Hammer used in reverse circulation drilling applications. It highlights design principles, advantages, and key components of the hammer, emphasizing its high impact energy, efficient crushing function, and low air consumption for geological exploration and mining.

Design Principles and Advantages

• High impact energy output with precise high-frequency impact for effective rock crushing.
• Low air consumption to reduce operational costs and improve efficiency.
• Ease of maintenance and hammer accessory compatibility.
• Designed for geological sampling with high-quality sample recovery.

MDRC 5 Hammer Components

The hammer consists of multiple parts, each with a specific part number for identification and replacement. Key components include:

• O-Rings (multiple sizes and positions)
• Adaptor Tube
• Hole Ring
• Air Screen
• Axle Ring
• Top Sub
• Check Valve
• Bowl Shape Ring
• Spring
• Steel Pad Ring
• Rubber Ring
• Air Distribution Seat
• Sample Tube
• Tube Seat
• Inner and Outer Cylinders
• Piston
• Check Ring
• Bush Drive Sub
• Chuck Ring and Chuck Sleeves
• Sleeve Protector
• Drill Bit

Technical Parameters of MDRC 5 DTH Hammer

Drill Bit Specifications

The document lists various reverse circulation drill bits compatible with the hammer, including their diameters, button insert configurations, and weights. Examples include:

• Diameter range: 140 mm (5.51") to 190 mm (7.5")
• Button insert patterns: combinations of 8×16 mm and 6×16 mm buttons on outer and front faces
• Weight range: approximately 5 kg (11 lb) to 20 kg (44 lb)
• Part numbers provided for ordering specific bit sizes

Critical Information and Best Practices

• Ensure correct hole size (140-160 mm) for optimal hammer performance.
• Maintain working pressure within recommended range (125-250 PSI) to achieve desired impact frequency and efficiency.
• Use recommended rotation speed (30-50 RPM) to balance drilling speed and hammer longevity.
• Regularly inspect and replace O-rings and other wear parts to maintain hammer integrity.
• Select drill bits appropriate for geological conditions and desired penetration rates.

Overall, the MDRC 5 hammer is designed for cost-effective, high-quality geological sampling with efficient air consumption and robust impact performance.