Impeller for the three single-string bending garden leaves, use a semi-enclosed impeller, and the use of malleable iron, so high strength, corrosion resistance;
叶轮为三片单园弦弯叶，选用半封闭叶轮，并采用可锻铸铁、所以强度高，耐腐蚀；
The bending deformation of V-shape composite insulator string under strong wind may cause the risk of ball head falling off and string falling apart.
型复合绝缘子串在大风作用力下受到弯曲变形，有球头脱落造成掉串的风险。
Drill string receives the complicated stress which is tension-compression stress, torsion stress, bending stress, etc.
在长期工作中，钻具承受拉伸、压缩、弯曲和扭转等复杂应力。
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