GB/T 19494.2-2023 "Mechanized sampling of coal - Part 2: Preparative of coal samples" is the standard used for the preparation of coal samples in the process of mechanized coal sampling. This standard specifies the methods and procedures for the preparation of standard coal samples from raw coal samples, ensuring the representativeness and conformity of the samples. The standard covers the key steps such as cutting, crushing, mixing and splitting of coal samples, as well as the requirements and operating specifications of related equipment. These steps and requirements help to ensure the accuracy and Reliability of coal samples in subsequent testing, analysis and evaluation, and are of great significance for coal trade, production and utilization.