Kelly box for kelly bar Quick Details
As long as the drill pipe square head of the rotary drilling rig is the same model in China, the size is the same. For example, the square head size of Shanhe 22 and sany 22 are the same. Because rotary drilling entered the China Sea earlier, there is no unified standard in our country, but the main engine manufacturers are basically the same. The difference in model is mainly divided into two schools: Shanhe school, which uses a standard rotary drilling chassis and has good stability; Sany style adopts a general excavator chassis, which lacks stability but saves cost.
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