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Particle Size Measurement Instrument Product List

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Grading machine "Micro Shifter" / Air jet type particle size measurement device

A unique classifier that carries powder particles on an air flow and passes them through a screen.

To classify powder particles into the required sizes (a process called classification), there are generally two methods: using a screen (sieve) and utilizing differences in specific gravity to classify with air (air classifier). It is not feasible to achieve 100% or a mixing ratio of 0% with an air classifier, and vibration-type sieves are not suitable for large-scale processing due to issues like clogging. The "Micro Shifter" is a unique classifier that allows powder particles to pass through a screen by riding on an air flow. The newly developed fan-less type (NF type) incorporates a specific gravity separation mechanism, achieving higher precision classification. The "Air Jet Sieve Particle Size Analyzer" measures down to a minimum of 20μ using dedicated JIS standard sieves. 【Features】 ■ High precision classification and separation ■ Can process easily agglomerated fine powders ■ Can handle adhesive powders ■ High reliability due to screen type ■ Screen replacement is easy with one touch ■ Internal cleaning is simple ■ Minimal vibration ■ Can also be used for removing foreign substances such as hair and debris from powders, as well as removing powder from particles ● For more details, please contact us or download the catalog.

  • Aggregates and crushed stone
  • Particle Size Measurement Instrument

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Tohoku Univ. Technology:Estimation method of grain size of crushed stone:T24-032

Real-time high-precision estimation of grain size of blasted crushed stone

Crushed stone is essential materials for transportation infrastructure and civil engineering structures. Crushed stone mining is carried out in the order of drilling, blasting, splitting, scooping, and transportation. The cost of scooping and transportation is affected by the grain size of the blasted crushed stone. Therefore, the blasting aiming at the optimum grain size is important, and the automation of the grain size evaluation of the blasted crushed stone is required.  Conventionally, a method for extracting grain size by binarizing images has been devised. However, there have been problems in estimation accuracy because of similar colors of crushed stone and overlapping of crushed stones.  In the present invention, focusing on the fact that the overlap of crushed stone changes during the scooping process using a hydraulic shovel or the like, we developed a method for accurately estimating grain size by eliminating the overlap of crushed stone by binarizing images extracted from the video of the scooping process with multiple threshold values. This invention is expected to lead to automation of the blasting cycle and realize safe and efficient blasting.

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  • Particle Size Measurement Instrument

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