‘Three into One’ Drilling Tool Which Combined Wire Line Core,Hydro-hammer and PDM;

The paper introduces technical specifications and structural concepts of newly developed "three-in-one" drilling tool(wire-line coring,hydro-hammer and PDM)and describes experiment of testing drilling hole and main borehole of CCSD.

Based on the wire line coring, hydro-hammer, PDM drilling technology, "There into One" drilling tool was developed.

Model and fatigue life analysis for screw rotor of single screw compressor

Introduces the digitize measurement of screw rotors, under studying shape feature of the rotors and the causes of measurement error in CMM, adopts the optimum measurement gradually.

The machining precision of the engaged conical twin-screw rotors,which are the key parts of a conical twin-screw extruder,has direct effect on the performance of the extruder.

A finite element analysis on the helical rotor of high consistency repulper;

The meshing analysis of helical rotors and their computer;

The constitution and mathematic expression of the end face profile are analyzed for helical rotors.

BIVIS extruders are going to be applied extensively in the high concentration pulping process and the optimum design and wearresistance treatment of the screw rotor, which is the core part of the BIVIS extruder, are the key to apply the superior refining performance ofBIVIS extruder.