RG-1 Purpose-Built Shingle Grinder Rotochopper

RG-1 Purpose-Built Shingle Grinder Rotochopper

Nothing minimizes wear costs and maintenance downtime for shingle recycling like the purpose-built RG-1 shingle grinder.

The RG-1 produces fine texture RAS (recycled asphalt shingles) with the lowest cost per ton, thanks to unique features designed for the challenges of shingle recycling:

  • High capacity feed hopper and incline feed belt
  • High-torque agitator to prevent bridging and break apart compacted shingles
  • Floating load leveler
  • Patented rotating anvil
  • Gravity-fed mill
  • Clamshell screen with 5,000+ square inches of grinding surface and shear pin protection
  • Grinding rotor with high-profile tooth mounts and sweptback teeth
  • Non-directional rotor tooth pattern to minimize lateral flow and wear on grinding chamber walls
  • RG-1 Purpose-Built Shingle Grinder Rotochopper
  • Grinding chamber water atomization manifold
  • Continuous collection and discharge conveyor
  • Reversible radiator fan
  • Cross-belt magnetic conveyor (optional)
  • Discharge belt scale (optional)

Grinder Uptime VS Grinder Upkeep

Because the RG-1 is designed specifically for the abrasiveness and cohesiveness of shingle waste, you spend dramatically less time on maintenance and more time producing a valuable asphalt cement supplement. With the RG-1, routine wear related maintenance is limited exclusively to the teeth and screens, rather than permanent structures like anvils or grinding chamber walls. By contrast, wood grinders used for shingles often require frequent—sometimes weekly —hardfacing or other time-consuming maintenance procedures. The RG-1 typically requires hardfacing only on select spots once or twice per year.

Feed System

Before shingle waste even reaches the RG-1’s grinding chamber, it has been de-compacted into a steady flow. A slow speed high torque agitator breaks apart clumps and prevents hopper bridging. A floating load leveler maintains a uniform flow of loose shingles. The incline feed belt is regulated by engine RPMs (or electric motor amp draw). The highly controlled flow of raw shingles typically keeps the engine RPMs within a tight range of fluctuation.

Feed Transition

Shingles flow from the incline feed belt by gravity without any power-driven parts to assist the transition from the conveyor to the mill. This smooth, effortless transition prevents raw shingles from by-passing the grinding chamber or accumulating on the ground. The gravity feed chute separates the feed system from the abrasive high-speed grinding zone. The patented rotating anvil force feeds shingle waste into the grinding rotor for rapid, efficient processing.

Grinding Chamber

The RG-1’s grinding chamber keeps the grinding process—and wear—focused on the rotor teeth and sizing screens, which are designed for quick, easy replacement from ground level. Unlike wood grinders with spiral tooth patterns, which force abrasives sideways into the grinding chamber walls, the RG-1’s rotor pushes shingle waste outward into the screens for controlled grinding action and wear. With over 5,000 square inches of grinding surface, the wraparound screen lets material escape the grinding chamber as soon as it is properly sized. The water injection manifold atomizes water directly above the rotor for more effective cooling without excess water.

Discharge Conveyor

The RG-1 features a single-piece collection and discharge conveyor with a hinge-less splice. The discharge conveyor can be equipped with a cross-belt magnetic conveyor for removing roofing nails and other ferrous metal.

The Difference that Makes a Difference

When we set out to engineer the RG-1, we worked with shingle recyclers to design a unique solution to their day to day challenges of grinding shingle waste. The stories we heard from these shingle recyclers all painted the same picture: grinding equipment operators spending up to a 1/3 of every work week on maintenance, grinders requiring major overhauls (or replacement) every 1-2 years, and shingle recyclers left waiting for genuine solutions, rather than just add-on packages that failed to address the real weaknesses of wood grinders used to recycle shingles. Our focus on customer success led to a truly unique machine that is still the standard for shingle recycling equipment.

One look at the RG-1 will tell you that it is different, from the outside to the inside, from the bottom to the top. But it’s not just a different design. It’s a whole different approach to recycling shingles. You see the difference where it matters most: your bottom line.

No other grinder delivers a lower cost per ton of RAS, and no other shingle grinder matches the uptime and longevity of the RG-1.


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