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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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A noise control package for vibrating screens.

M Jenae Lowe1, David S Yantek1, Junyi Yang1

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Summary

Noise controls for vibrating screens significantly reduce coal preparation plant noise. Field testing confirmed these practical solutions offer comparable results to laboratory findings, improving worker safety.

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Area of Science:

  • Occupational Health and Safety
  • Acoustics Engineering
  • Mining Safety

Background:

  • Hearing loss is a prevalent occupational illness in mining.
  • Coal preparation plant employees face significant noise-related injury risks, particularly from vibrating screens.
  • Previous research identified vibrating screens as major noise contributors in these environments.

Purpose of the Study:

  • To develop and evaluate effective noise control strategies for vibrating screens in coal preparation plants.
  • To assess the performance and durability of novel noise control technologies.
  • To reduce occupational noise exposure for mining industry workers.

Main Methods:

  • Development of a noise control suite including constrained layer damping (CLD) treatments, tuned mechanism suspension, acoustic enclosure, and spring inserts.
  • Laboratory testing to quantify noise reduction.
  • Field testing of CLD treatments and spring inserts on a vibrating screen in an operational coal preparation plant.

Main Results:

  • Laboratory tests demonstrated a 6 dB reduction in the A-weighted sound power level of vibrating screens with the noise control suite.
  • Field testing of spring inserts and CLD treatments showed noise reductions comparable to laboratory results.
  • The selected controls proved practical for installation and effective in a real-world mining environment.

Conclusions:

  • The developed noise control suite is effective in reducing vibrating screen noise.
  • Field-tested components (CLD treatments and spring inserts) offer a practical and comparable solution to laboratory findings.
  • Implementing these noise controls can mitigate occupational hearing loss risks in coal preparation plants.