High Load GGG70 DRS Traveling Wheels

The DRS wheel block wheel comes in three materials: spheroidal graphite cast iron, polyamide, and polyurethane.Under the same size, the Demag wheel block made of  spheroidal graphite cast iron has superior bearing capacity.

Spheroidal Graphite Cast Iron

The original DRS wheel blocks design deploys GGG65 spheroidal graphite cast iron, a cast-iron alloy impregnated with graphite in a spheroidal form, which combination improves the cast iron's damping characteristics, giving it cost-effective properties than steel.In addition, the graphite is self-lubricating, so friction between the wheel flanges and the track is reduced which, in turn, reduces wear on the wheel and rail. The latest design, however, uses a new alloy cast iron (GGG70) with better vibration-damping and self-lubrication properties than the original. For example, load capacity per wheel for the DRS125 spheroidal graphite cast iron is 11,000 lb (9.8-in. wheel diameter).

Polyamide Wheels

Polyamide wheels, made from cast polyamide, PA6, are used when quiet running and low rail wear is necessary. The polyamide wheel combats abrasion and has a higher traction resistance than spheroidal graphite, but significantly lower load capacity. For example, each DRS125 polyamide wheel handles loads to 2,200 lb/wheel (4.9-in. wheel diameter).

Hydropur Wheels

Another material called hydropur, a polyurethane elastomer, offers higher traction resistance than the spheroidal cast iron, making speeding up or slowing down easier. Additional benefits include less running noise and good damping characteristics. The material's soft exterior makes these wheels particularly suitable for use on concrete, wood, or plastic-coated running surfaces. However, as with the polyamide wheel, consideration must be given to the hydropur wheels' reduced capacity, which, for the DRS125 polyurethane wheel is 1,740 lb/wheel (4.9-in. wheel diameter).

Applications

The selection of the material for DRS wheel blocks largely depends on the specific application requirements. Spheroidal graphite cast iron is optimal for heavy-duty applications, polyamide is ideal for noise-sensitive environments, and hydropur (polyurethane) is perfect for surfaces that require protection and noise control. Each material brings its own set of advantages, catering to diverse industrial needs. Understanding these differences helps in making informed decisions to achieve optimal performance and longevity of the wheel block system.

MAILUN provides different materials of DRS wheel block, if you want to know more about Demag wheel blocks, free to contact us to obtain relevant information.