Underground mining machines — Mobile extracting machines at the face — Safety requirements for shearer loaders and plough systems — Amendment 1
2Expert Interpretation
An in-depth analysis of the revisions to ISO 19225:2017/Amd.1:2019 on safety requirements for underground mining equipment, focusing on new noise measurement specifications for drum shearers and coal planing systems, updates to sound pressure level determination methods, and additional requirements for standard references.
Core content of the standard revision
This amendment mainly updates the technical specifications for noise measurement of drum shearers and coal planing systems, and adds three new acoustic standards including ISO 11201 as normative reference documents.
Technical requirements for noise measurement
| Measurement parameters | Original standard requirements | Revised requirements |
|---|---|---|
| Sound pressure level measurement | Specific standard not specified | ISO 11201:2010 method must be adopted |
| Measurement point arrangement | Measurement in one direction | At least three measurement positions in three-dimensional space |
| Background noise | Correction method not specified | Environmental correction (ISO 11202) must be performed |
Key Instrument Operation Specifications
For the test of coal planing system:
- The measurement position should include both ends of the gearbox and the motor
- The moving parts need to maintain a standard speed of 10m/min
- The background noise correction value shall not exceed 5dB(A)
Background of Standard Evolution
This revision is due to three technical defects found after the implementation of the 2017 version:
- The original noise measurement method did not take into account the three-dimensional sound field distribution
- The requirement for capturing the instantaneous noise peak value was missing
- The mathematical modeling method for environmental correction was not clear
Implementation Suggestions
Enterprises should focus on:
- Update test equipment to meet the requirements of ISO 11201 series standards
- Redesign the measurement point layout
- Establish a new noise data recording template (need to include environmental parameters)
During the transition period, it is recommended to use parallel testing to verify the differences between the old and new standards.