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Gravimetric Blender Weighing

Load Cell for Gravimetric Mixture Blender

Gravimetric blenders play a crucial role in industries where precisely monitoring the mixture quantities is required, such as in plastics manufacturing or medicinal processing. Being able to accurately meter raw materials such as fine or coarse powders, resin, regrinds, colouring agents, and other additives ensures efficiency and consistency in the output product. The stringent accuracy requirements demand a load cell that excels in off-centre loading and precision weighing of hopper content.

Challenge

  1. High Accuracy: The system must be able to consistently deliver precise ingredient doses of materials varying in density, constitution, and at variable flow rates.
  2. Vibration and Impact Management: Load cells must maintain accuracy in a dynamic environment susceptible to disturbance caused by the mixing chamber or adjacent machinery.
  3. Compact Form Factor: Load cells must mount to the hopper above the blender without exceeding the pre-existing packaging constraints imposed by the machine.

Solution

  1. The sensor uses custom high- and low-temperature strain gauges, with added temperature compensation and fatigue testing to ensure data stability.
  2. It incorporates specialized vacuum-sealed materials with excellent electrical insulation, chemical stability, broad temperature range, and low volatility. The elastomer materials undergo special polishing and inspection, and aerospace-grade vacuum cables are used to enable the sensor to operate in a vacuum environment.
  3. A three-layer sealing system is employed, including strain gauge protection, two layers of vacuum material sealing, and cap sealing. This multi-layer protection effectively prevents moisture from affecting the sensor’s performance.

Conclusion

By integrating ANYLOAD’s single-point load cells into the gravimetric blender, the system delivers ±0.03% weighing accuracy for precise material blending and improved production efficiency. Its compact, space-saving design fits a wide range of hopper configurations while handling eccentric loads with reliable performance. Constructed from high-strength aluminum alloy, the load cell offers excellent durability, vibration resistance, and cost efficiency. The single-point design also simplifies installation by eliminating the need for junction boxes, while its optimized structure provides enhanced torsion resistance for long-term stability and accurate weighing.

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Keywords:

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108AA3MUN
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