The original analogue control system has been upgraded several times and with the move to the BLADE laboratory has been replaced by a digital control system manufactured and installed by INSTRON in 2004. Built-in instrumentation makes information from three sources available to the DCS: each actuator having an LVDT within the cylinder and an accelerometer at the platform end of the piston. In addition load cells measure the loads applied by each of the actuators
The expanding applications of vibratory feeders for controlling the flow of bulk materials, and their adaptation for processing requirements, have developed a considerable interest in stockpiling and reclaim systems. The general design of these units consists of a material transporting trough (or platform) driven by a vibratory force system. The flexibility and variety of designs are limited only by the ingenuity of design engineers. The basic motion of the vibratory trough, or work member, is a controlled directional linear vibration which produces a tossing or hopping action of the material. Material travel speeds vary from 0 to approximately 100 ft. per minute, depending on the combination of frequency, amplitude, and slope vibration angle
The ball mill is operated in closed circuit with a particle-size measurement device and size-control cyclones. The cyclones send correct-size material on to flotation and direct oversize material back to the ball mill for further grinding
Roll shells are made of manganese or chrome alloy steel, depending upon the type of material to be crushed. The outside faces are ground or machined true and smooth for fine grinding and rough ground for coarse grinding. The inside surfaces are accurately tapered to fit the draw-type cores
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Marcy Double Roll Crushers are used in intermediate size reduction of medium hard to hard materials such as rock or ore, and can bridge the gap between laboratory and production outputs. Models with 3,000lb per hour (1,361kg) or 8,000lb per hour (3,629kg) capacity reduce most materials from 0.5in (13mm) feed size to minus No. 10 (2mm)
Dust also is a hazard on walkways and a problem for conveyors. If maintained, side-skirting and sealing the conveyors keeps dust from spilling out, building up underneath the conveyor, or building up in rollers, pulleys, bearings, and causing wear on shafts. Its important to maintain the sealing rubbers on the conveyor belts to avoid those issues. Routine maintenance calls for removing accumulated dust from inside and under the machine
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For particulate solids, a rotary dryer may help promote uniform and more rapid drying (Fig. 14.14). In the rotary cascade dryer, the material is placed in a rotating cylinder through which a hot air stream is passed. Flights on the cylinder wall lift and cascade the product through the air. In a variant, louvers are used instead of flights so that the product is mixed and rolled instead of dropped. The dryer is typically sloped, so that the product enters and gradually falls toward the discharge end. In direct rotary dryers, the air is passed through burners, and directly comingles with the product. Rotary dryers have been used to dry seeds, corn gluten, distillers grains, and some fruit
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