Graded combined test sampling method for coarse grain type mixed material sample

The invention relates to the field of sampling preparation, in particular to a coarse grain type mixed material sample grading combination test sampling method. Comprising the following steps: grading coarse grain type mixed materials; taking a coarse grain type mixed material total sample, screening the total sample by using multi-stage screening equipment to obtain different graded samples, and respectively storing the different graded samples; grading sample proportion calculation; weighing the weights of the different graded samples after grading, and calculating the weight ratio of the different graded samples; preparing a test sample; calculating the preparation dosage of each graded sample according to the total mass of the single test sample; and weighing the graded samples according to the calculated preparation dosage, and uniformly mixing the weighed graded samples to obtain a test sample. According to the method, the uniformity of the sample can be ensured by adopting a graded combined test sampli