锯链的驱动张力是驱动力与切削阻力及摩擦阻力相对抗而产生的，在不同位置其大小不等。
Drive tension is caused by resistance of driving force and cutting resistance and frictional resistance and it is not the same value at different places.
论述了一种利用液力叉车作为进给动力，由电机驱动链锯式割刀作为工作头的小型立式割煤机的主要性能设计。
The paper introduces the main functional design of a kind of small cutting coal machine with hydraulic fork lift as feed power and chain-saw cutting knives driven by generator as working head.
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