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Bolt-On Strain Gauge Sensors: Real World Application In Mining

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Australia is the fifth largest producer and the second largest exporter of coal in the world. Apart from export, coal is used domestically for electricity generation, manufacture of steel and cement and other power generation purposes.

Mining contributes heavily to the Australian economy and accounts for 6-7% of Australia’s GDP, exceeding both agriculture and tourism industries together. Being a critical contributor to the Australian economy, coal mining not only depends on its volume, but also focuses on continual improvements in productivity and efficiency. As a result, the industry has been massively supported by strong equipment, world-class transport system, high-quality port facilities and infrastructure.

clientsThe Client

The majority of coal mines is located in the western coalfields of New South Wales. Our client is one of the most established operations in Australia’s Hunter Valley, specialising in mining thermal coal. Recently, these mining operations were granted government approval to expand their operations, increasing production to 4 million tonnes of export quality coal annually.

Unlike other conventional underground mining operations that incorporate continuous mining and long wall retreat technology, the coal mine is integrating a mix of underground and open cut methods of mining. The latter method, following the environmental protection measures, reduces the risk of the radiation hazard for mine personnel and allows coal extraction without causing structural weaknesses.

bolt on strain gauge sensors application in the mining industry
bolt on strain gauge sensors application in the mining industry
bolt on strain gauge sensors real time weighing technology for the mining industry
top weighing and strain measurement applications for bolt on strain gauge sensors

eyeThe Challenge

After coal is dug up from the open cut mine, it is transported in trucks to the process plant (where it is processed) and then fed to the train load bin for shipping. Coal loading is done automatically and continuously, with the train passing by without stopping (it slows down up to 0.8 km/h). It is crucial that load bins are filled to their optimal capacity. If you underfill the wagon, you run the risk of it being pulled off the track on a curve by the other carriages. If you overfill it, it can bounce on the rail, causing damage to the track.

Considering that the government owns the main shipping lines, there is a compulsory fine of $100K per hour for any delay and a $4M fine for any minor derailment or damage to the line. Even if you don’t manage to load coal, you still must pay for the train, as they run on a schedule every day.

bolt on sensors

puzzleThe Solution

When it comes to bin level measurement, there are a few systems available. Often these solutions require specialist skills and tools. To replace a faulty sensor, you need to drill a large hole, accurately hand ream it and press the sensor into the metal using a specialist tool, without damaging it on installation. Datum Electronics solve this conundrum with the bolt-on sensors, having none of these risks. All you need do is to mark and drill 3 off 9mm holes, clean the surface and torque them up! It takes two men as little as an hour to install the bolt-on sensors to the bin, whilst other solutions can take hours.

Datum’s 3–hole bolt-on weighing sensor solutions are ideally suited for inventory monitoring and process control, ensuring reliable operations in the mining industry. Their low maintenance requirements along with the ability to compensate for temperature changes result in increased loading rates and reduction of capital and operating costs.

bullseyeThe Impact

The Coal Mine complex is operating 24 hours a day 7 days a week. With 3 trains of 80 carriages a day, they aim to ship about 240,000 tonnes of coal per day. As a day’s delay can cost the company up to $29M, it’s imperative to eliminate unnecessary failures and reduce maintenance issues to a minimum.

Moreover, strain gauges, utilised in the harshest environments, cannot withstand the ravages of time. By using a plug-in terminal junction box, it’s easy to find a faulty sensor, replace it and get on with loading the trains quickly. And should the worst happen, replacing all 4 bolt-on sensors costs considerably less than 1 press-in type sensor from a typical bin level measurement system.

3 Hole Bolt On Strain Gauge Weighing Sensor Solution