The frame of mast derrick that is designed for hydraulic wheel tractor hoist adopt welding of armor plate, its section is oblong armor plate, and its material is HG60.
为满足液压轮式通井机的使用要求而设计的桅杆式井架采用板焊结构，主体截面为长方形的方形钢，材料为HG60。
The driving wheel and the driven wheel welding roller frame each have two wheels, the wheel of metal material, so it can greatly improve the bearing capacity of the welding roller frame.
焊接滚轮架的主动轮与从动轮上各有两只滚轮，选用金属材质的滚轮，这样就可以大大提高本焊接滚轮架的承载能力。
The driving wheel and the driven wheel welding roller frame each have two wheels, the wheel of metal material, so it can greatly improve the bearing capacity of the welding roller frame.
焊接滚轮架的主动轮与从动轮上各有两只滚轮，选用金属材质的滚轮，这样就可以大大提高本焊接滚轮架的承载能力。
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