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Machine Vision Newsletter

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info@adeptturnkey.com.au


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(08) 9242 5411

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Ore3D Ore Sizing
Back to the Vision Systems
Back to the AES Systems

• Measures in 3D
• No lights = consistent accuracy
Saves costs
• Easy to interface
• On-Line and Automatic

About the Ore3D system
Ore3D is a unique fragmentation measurement technology developed for the minerals processing industry that is novel and well proven.

The Ore3D Ore Sizing sensor is the latest breakthrough in online, non-contact, ore-sizing technology that can be retro-fitted over a conveyor belt carrying ore. It has been operational on sites for years, requires very little maintenance and has exceeded all expectations in performance and accuracy.

Built upon the already proven and reliable, OOS technology Ore3D offers high-speed size distribution measures, accurate fines detection, volume and bulk density measures and many more advanced features.

With many installed sites running 24/7 for up to 8 years with little if any maintenance, Ore3D offers a very dependable, consistent technology.

Benefits
Ore3D allows Miners and Minerals Processors to measure the size of their ore at any stage of the comminution process: as ROM after blasting, post primary, secondary or tertiary crushing, as feed to SAG mills. It allows minerals processors to provide tighter control their processes and also measure performance and influence blasting operations in the mine to optimise the complete mining chain for total and maximum efficiency. It also allows the detection of oversize to avoid potential plant damage, detects screen wear or failure and triggers an alarm in case of oversize contamination.

The technology offers data feedback to allow control systems and operators to tighten the control of their processes and increase efficiency. It can improve extraction, increase throughput and reduce consumables and running costs. The bottom line is that these benefits can significantly reduce costs and increase profits.

How It works
Ore3D is a rugged and online instrument designed to fit over conveyor belts to produce continuous size distribution measures.

It uses a technique called "active stereopsis" to measure the burden of ore in 3 dimensions on a moving conveyor belt . The technique measures individual fragments of ore on the belt as they pass through the system, processes them with sophisticated software algorithms to produce mass measures, and outputs accurate cumulative % passing size distribution curves, repeatedly, 24/7.

The size distribution data is derived with industry-standard techniques so that it matches those generated by traditional sieving techniques. Any number or selection of points on the size distribution curve can be output and used as inputs for feedback or feed-forward control or simply as trending data for operators in the control room.

Ore3D features and advantages  

• Determines full size distribution

• Detects oversize
• Measures Volume -> Bulk Density • Measures in 3D
• Rapid update rate – 50 to 200 scans per second • On-line and automatic
• Instant and continuous • Produces topographic maps
• Produces shape and grade measures • Automatically detects empty or partially empty belt
• Requires very low maintenance - no lights • Easy to interface to any plant control system
• Corrects for parallax and perspective distortion • Non-contact sensing
• Uses high contrast features for better sizing accuracy • Automatically recognises empty or partially empty belts
• Data capture scan rate = 50/sec continuous • Uses NO lights and so measurement remains accurate
• Solid State low power laser 100,000hrs MTBF • Requires very little maintenance
• Can be used for operator trending feedback • Easily interfaced to SCADA via PLCs or direct

Being a 3D system, Ore3D can measure an accurate size for particles regardless of their distance from the camera and can measure the volume of ore passing which can be useful for optimising loading operations. Measuring volume with a weightometer measurement alsoallows for Bulk density measures. The system can also measure the surface profile of fragments and so determine shape parameters.

The system captures images continuously, 50 to 200 times-per-second, so that every part of the ore burden on the belt is sampled.

An empty belt can be detected easily and automatically as it takes a unique shape when empty. Ore3D avoids measuring the belt with missing or surging loads quickly and easily.

Ore3D uses a high-contrast laser line to detect position. YThis high contrast enables it to measure with very high precision using sub-pixel interpolation techniques.

Ore3D requires no lighting. Area lighting ages from the first day of operation, leading to a shift in brightness and uniformity causing a continuous drift in the data measured and a constantly degrading accuracy. Ore3D avoids this problem. Using a long-lifetime solid state laser that needs no maintenance, the system runs at the same brightness and uniformity for 100,000 hrs (MTBF) before failing and triggering a system alarm to prompt a laser change. Ore3D's measures remain reliable and repetable for years with the need for recalibration.

Applications  
•Optimisation of feed size distribution into grinding mills • Monitoring oversize and fines in product streams (lump in fine)
• Monitoring crusher performance • Size control for product quality, e.g. quarries
• Sorting and recovery - flow rate and size required, e.g. diamond mining • Volume flow rate for maximised belt loading
• Truck-fill volumes • Plant audits
• Monitoring size fractions in split ore streams • Measurement of fragmentation from varying blasting designs
• Product-quality monitoring at ports after blending • Monitoring screen wear
• Detection of oversize in feed material  

 

 

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