介绍两辊式和三辊式机械弯曲除锈原理，给出关键参数如辊子直径、牵引力等的设计计算方法。
Design and calculation method of the key parameter such as the diameter of roller and pulling force are given.
便携式智能拉力仪是为测量农业机械牵引力而设计的。
The handy intelligent pulling force instrument was designed for measuring pulling forces of agricultural machinery.
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