The body of machine is welded by steel plate and steel casting, stable performance and high concentricity of spindle, running steadily without building foundation Double safety device of mud pressing plate without any influence when the screw get broken and drop into mud cylinder Spindle and mud pressing plate dip in lubricating oil, intelligent control room direct air forever without plugging mud of trouble Super housings: siamese steel casting and weighs 150g, steel split-type, special design, the replacement of 1 to pay the higher level spiral time in 30 minutes