What are Two-Mass Vibratory Feeders?

July 26, 2018

Two-mass vibratory systems are built to carry out heavy-duty actions onboard dynamic screening decks. There’s reciprocating motion going on inside the mining equipment. It’s so finely tuned and realized that the feed aggregate streaming through this brute force machine replacement can safely increase threefold. That’s a bold claim, one that can’t be properly confirmed until its operational principles are fully understood. To begin with, what are the two masses?

Breaking Down the Two Mass Stroke

The goal is to screen the aggregate rapidly without consuming massive amounts of kinetic energy. To this end, this innovative vibratory mechanism uses a groundbreaking sub-resonant energy exchanging architecture to conserve output mechanical power. This is done by adding a series of precision-engineered coil springs to the equipment. As one mass passes its zenith, it stores energy in the spring assembly. Then, as the next mass takes up the vibratory mantle, that mechanical power is transferred from the springs.

A Two-Mass Anatomy Lesson

The first weighted segment is called the “exciter.” Next, the second segment is referred to as the “deck-assembly.” Basically, thanks to the interposing coil spring assembly, this equipment does more with less input energy. Frankly, it sounds like this next-gen vibratory feeder is trying its best to break the laws of physics. However, the deck isn’t creating energy. No, the sub-resonant architecture and springs are just exceptionally good at storing vibratory power and returning it when required. Alternatively, the mine director could opt for a brute force, single-mass mechanism, and one that uses rotating weights and other contra-rotating parts, but that option is more energy intensive. Quite honestly, it seems like that cost-savvy manager would prefer a screening solution that works more efficiently, processes more aggregate, and does all this on a fraction of the input power.

The Two-Mass Benefits

On observation, the spring-loaded equipment displays a few notable benefits. It’s a self-governing screening deck, so expect the moving parts to automatically adapt as the volumetric flow increases. As the volume drops, it slows again, which means more energy savings are realized. Low in energy consumption, the equipment is also easier to maintain that its single-mass cousin, for there are fewer moving parts to monitor.

Mining technology usually evolves in a series of small hops. Every so often, however, the advances occur as massive leaps. And so it is with two-mass vibratory screening systems. Gone are the weights and shafts and cranks. In their place, there are two masses and a coil-spring assembly. The springs are obviously onboard to store kinetic energy, plus they act as a controlled dampening mechanism.

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