The abrasion-resistant and rustproof sleeve is the only part exposed to the chain and the process, which results in a long service life minimal maintenance requirements.

这种耐研磨和不生锈套管是阀门中唯一与锚链接触的部件，因此阀门的使用寿命就更长，对维护的需求也更少。

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This paper briefly reviews several calculation methods for roller chain drive, and discusses calculation principle of finite service life for roller chain.

本文扼要评述了几种链传动计算方法，讨论了钻机链传动的有限寿命计算原理。

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Improving of material, dimension, heat-treatment, construction form on the chain of bucket conveyor are introduced, then increase service life of bucket conveyor.

通过对斗式提升机链条的材质、尺寸、热处理、结构形式的改进，从而提高了其使用寿命。

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