Manual electric arc welding technology for oblique sprocket tooth;

Transfer case sprocket production through the sinter hardening process;

Manufacturing Tool Design of Cycloid Sprocket Teeth Form;

Machining the chain wheel of the lower pumping unit with a special cylinder - chain;

The technological property of the chain wheel of the torsion-limiting device is analyzed.

The numerical simulation result for a big steel casting chain wheel,which has been disclosed large number of MT thin lines on its teeth and groove,showed that its imperfection was micro porosity,which was then verified by an metallographic analysis through getting slices in the tangential and cross section on the chain wheel′s imperfection site.

The method of the sprocket wheel techno-parameter is researched.

Sprocket wheel's process method was analyzed,and series sprocket wheel's milling cutter was designed.

The importance on material selection of sprocket wheel of heavy and heavier scraper conveyor are showed.

According to test requirements, the sprocket gear test bench is design by ourselves.

This paper makes an analysis of the structural characteristics and the mechanical properties of detachable drag chains and chainwheels used in overhead conveyors, makes comprehensive comments on the defects and mistakes in these standards and makes suggestions of the principles for revising and improving these standards.