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S3R3216是在4R3216基础上改进设计而成，主要改进是辗轮和碾盘的相对运动关系，分级装置以及机器密封方式，特别是辗轮自带动力的传动方式等。本文从理论和实践结合上分析这些改进的必要性和先进性。
S3R3216 is based on the 4R3216 improved design, the main improvement is the relative movement of the rolling wheel and the pan, grading device and the machine seal, especially the rolling wheel comes with power transmission and so on. This article analyzes the necessity and advancement of these improvements from the combination of theory and practice.