Innovations For The Aggregate Industry
- Published: Monday, 01 February 2010 07:00
Atlas Copco's underground mining truck, MT42, is powered by a 520-horsepower Tier 3/Stage IIIA Cummins QSX15. The transmission has eight forward and two reverse gears, and features a self-diagnostic system for troubleshooting. A service bay on the side of the truck allows access to filters, valve blocks and service points, and the cabin can be hydraulically tilted to expose the engine bay.
The cab includes an air-suspended, forward-facing seat, a multifunction display monitor, air conditioning; and a trainer's seat. The operator's sound exposure is below 80 decibels in the cabin. Rear-facing cameras, including one for backing up and one for loading, increase visibility. The articulated steering allows agile cornering, while the dump system can discharge a full load in 13 seconds. Front axle suspension allows greater speeds on mine roadways. The truck's brakes are spring applied, hydraulic released and eliminate the need for a separate parking brake.
The model 825 Spectrum digital weight indicator from Cardinal has onscreen ticket configurability, truck storage identifications, digital fill control management and color-coded checkweighing operations. As many as 10 scales can be monitored simultaneously. Users can filter through truck/identification storage and accumulator data, and view reports based on specific criteria onscreen with the 825 Spectrum's 32-bit ColdFire processors and 64-MB user memory. The truck storage database may be shared with a PC for editing, sorting, and billing.
CONVEYOR CLEANING SYSTEM
Martin Engineering's carryback capture system transfers belt-cleaning residue back into the material stream, avoiding cleanup labor, injury potential, and dust hazards associated with buildup. Scavenger conveyors are typically installed in applications where the main conveyor belt is nearly horizontal, so recovered material will not flow due to gravity and must be moved by mechanical means. The carryback capture system stands 13 inches high, allowing it to fit into tight spaces under conveyors or in low overhead conditions.
It has an electrically driven hydraulic cylinder to push a steel cleaning blade or a series of blades across the system's collecting pan, sliding the fines into the trough toward the conveyor discharge. On the return stroke, the plows ride up onto tracks to be pulled back to the starting position, without dragging material in the wrong direction. The cleaning cycle of each unit automatically adjusts to match the belt speed of the main conveyor. The carryback capture system is manufactured in modular, four-foot sections, so it can be constructed in lengths from 8 to 24 feet. Units are available to match belts from 36 to 72 inches wide.
BinMaster Level Controls' SmartBob-SS sensor measures the level of solid material below a liquid surface. The sensor drops a weighted bob through the liquid; when the bob comes into contact with solid settled material at the bottom of the tank, it retracts and sends a measurement to a control console or a PC loaded with eBob software. The sensor comes configured with a 3-inch standpipe for installation and a stainless steel cable that stands up to corrosive materials. A SureDrop cap that prevents the weight from being retracted into the pipe and protects the device from unwanted material entering through the standpipe.
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