本文依据因次分析的基本原理，研究了装煤时旋叶升角的变化函数。
The variable function of vane Angle during loading is studied on the basic principle of dimensional analysis.
根据最佳装煤条件下的试验数据，提出了合理旋叶升角的范围；并从截煤效率考虑，对此范围进行了修正。
A-reasonable range of vane Angle is presented on the basis of experiment data in optimal loading condition, and the range is modified in view of cutting efficiency.
窍门：往150毫升沸水中注入一茶匙切碎的山楂花和叶，浸泡5到10分钟。
Tip: pour 150 ml boiling water over one teaspoon of leaves and flowers of chopped hawthorn, let macerator runs for 5 to 10 minutes.
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