The error in division, screening and drying processes in process of preparing coal sample is analysed. The reasons of error and the corresponding countermeasure are put forward.
分析了煤样制备过程中误差的来源，包括制备过程中的缩分误差、 筛分和干燥过程中产生的误差等，并对误差产生的原因提出了相应的对策。
It serves division of granular materials such as coal, ore samples in laboratory. It can improve division efficiency and quality. It is prepared according to coal sample preparing method in GB474.
适用于试验室对煤样、矿样等颗粒物料的缩分有较强的均匀性，提高缩分效率和质量，依据GB474《煤样制备方法》生产。
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