Mechanism sand often needs to be sampled and tested. How to sample mechanism sand?

The general method for testing and sampling of machine-made sand is:

1) When sampling on the pile, the sampling locations should be evenly distributed. Before sampling, first shovel the surface of the sampling site, and then draw approximately 8 parts of sand from different parts to form a group of samples.

2) When sampling from the belt conveyor, use a feeder to periodically draw approximately 4 equal amounts of sand at the discharge of the belt conveyor tail to form a group of samples.

3) When sampling from trains, cars and cargo ships, 8 sets of approximately equal amounts of sand are drawn from different parts and depths to form a group of samples.