Oval bevel gear is a kind of noncircular bevel gear which can achieve variable transmission between intersecting axes. We design the pitch curve by spherics cosine theorem in spatial polar coordinate because the pitch curve of oval bevel gear is not the planar curve. The bevel gear cutter is introduced, and we get the Three-dimensional model of oval bevel gear through extended development of UG. This method can make the calculation accurately, easily and get a wide variation of transmission ratio.

For the trend of aging population in China is increasingly serious and all kinds of advanced robots for senior and disable people aid emerged, the concept of intelligent network monitoring was considered. Monitoring system with video linkage monitoring, personnel physiological parameter measurement, real-time positioning and robotic status monitoring was designed for nursing house. Ethernet/SDARP (Ethernet /the Senior and Disable people Aid Robot Protocol) was firstly introduced into the network to ensure communication reliability and real-time performance. Integrated software of monitoring system with good compatibility, high efficiency and data security was developed using C#.NET and SQL Server. The integration of communication module was mainly introduced. Finally, the intelligent network monitoring system was practically used in Sijiqing Nursing House and has greatly improved the quality of medical and nursing service.