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。
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.
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。
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.
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