When differently sized mineral loads need dynamic sorting, mining equipment manufacturers are on-site to recommend a best-in-class solution. The company representative talks about vibrating screens, but there’s no end to the different options. Working on contrasting operational principles, the list of equipment includes flywheels and counterbalances, plus scores of other potential configurations. Let’s hustle on over to the primary vibratory deck to see an industrious vibratory principle in action.
Often installed behind a secondary crusher, this equipment is clearly designed to perform as a leading-edge aggregate sorter. In this wire mesh screening deck, the vibratory shaft is coupled to the centre of the alloy-toughened mesh sorting sieve. As it operates, short-wavelength jerks are delivered by a centrally mounted solenoid.
Instead of a jerking motion, the screens move in larger wavelength loops. With the screen inclined, the flywheel combines with a set of springs to send the mineral stream upwards and back, at which point the material lands and is seived. Key here, differently mounted shafts and shaped flywheels can adjust to generate contrasting waveforms.
This time it’s a large electromagnet that’s taking on the burden of the aggregate screening work. A fluctuating voltage sends pulses to the magnet. As the power cycles trigger the attractive action, supplementary weights and springs maintain the vibratory motion. Lacking in moving parts, and therefore requiring fewer maintenance resources, the design employs linear action.
Formerly, standard motors transmitted their rotating energy to couplings, and that mechanism hooked into an eccentrically mounted shaft, plus a few counterweights. Unbalance motors take all of these discrete elements and internalize the parts inside a single sealed housing. Elliptical motion or staggered circular vibrations, a simple adjustment is all it takes to make a change in the deck’s sorting action.
Below a compact, drum-shaped housing, a powerful motor is discharging energy, which reaches a pair of hammering mechanisms. Those plates are positioned above and below the central material grading chamber. Adding extra plates to the mining equipment, different kinetically active patterns are easily realized in both the horizontal and vertical plane. Used commonly in the food sector, for sieving flour and sugar, rotary screens are also found in the mining sector. And there are trommel screens and flip-flop screens, plus a whole body of alternative material sieving options on the market. They adapt to their conditions, perhaps by adding a second crescent weight or a faster frequency, and they rely on their different working principles to deliver just what the client demands.
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