GJB150.12A-2009 Environmental testing method for military equipment laboratory Part 12: The sand dust test details the specific test procedure for the dust blowing test of military equipment. The operation steps are as follows:
1. Adjust the temperature of the test section to standard atmospheric conditions according to the provisions of the technical documentation and adjust the air speed to the required value. The relative humidity value of the test section was adjusted to less than 30% and the humidity value was maintained throughout the test procedure.
2. Adjust the dust injection control device so that the dust concentration reaches 10.6g / cubic meter ± 7g / cubic meter.
3. Maintain conditions of 1 and 2 for at least 6 h unless otherwise specified. If necessary, periodically re-align the parts so that the other vulnerable surfaces are exposed to the dust flow.
4. Stop the dust supply. Reduce the wind speed of the test section to about 1.5 m/s, and adjust the temperature of the test section to the constant working high temperature or constant storage high temperature determined in GJB150.3A-2009, or other values ​​determined in the technical documents.
5. The condition of 4 was maintained for 1 hour after the test temperature was stabilized.
6. Adjust the wind speed to the speed used in 1, and restart the dust supply to maintain the dust concentration in 2.
7. Continue the test for at least 6 hours or as otherwise specified. If necessary, run the test piece as required by the technical documentation.
8. Return the test piece to standard atmospheric conditions and allow the dust to land.
9. Use brush, rub or shake to remove dust accumulated on the test piece. Be careful when handling to avoid introducing additional dust or disturbing any dust that may have entered the test piece. Do not remove dust by blowing or vacuum cleaning unless these methods are the same as those used in actual use.
10. Check the work according to the technical documents and record the inspection results.
11. Check the test piece to see if there is dust penetration. Pay special attention to bearings, grease seals, lubrication parts, filters, ventilation, etc. Record the inspection results.
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