The brake rims on drilling rig drawworks are subjected to heat load during string lowering and will end in thermal fatigue failure.
石油钻机绞车刹车鼓在下钻过程中，由于热负荷的作用会发生热疲劳破坏。
The generator for drilling rig should have its special performance because of the particularity of the load for drilling rig.
由于钻机负载的特殊性，要求钻机用发电机也具有自己独特的性能特点。
Derrick is the main supporting parts of drilling rig. It bears much static and dynamic load under different conditions. So there are high requirements for design and performance of derrick.
钻机井架作为石油钻机的主要承载部件，在不同工况下承受多种动、静载荷的作用，对其结构的设计和使用性能有着严格的要求。
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