The "bills seized" system, one of important features of salt trade contract, fully reflects the protection of private property, the maintenance of transaction security, and establishing a good operating order, which are similar to the system of real rights changing publicity in the modern ti.

Research for the RMB Intelligent Scorter Based on ANN;

Research on Small-scale Remote Control Ball-picking Robots

Fatigue life analysis and optimize of spring tooth based on MSC.Fatigue;

Based on the study of a type of air blast plastic film collector before spring sowing, the study on the key work parts of the spring tooth collection plastic and wind path applying visualized virtual design, finite element analysis, optimization and simulation technologies are conducted.

Based on concern about rocks changing the physical characteristic of soil, affecting the growth of crop and causing the farming mechanization, and by analyzing homemade and foreign rock pickers, study on the mechanism of a surface harrow type wheel rack rock picker and the primary technique parameters of the select picking equipment was worked out.

Whereas these situation,this paper analyzed the development history of rock picker in recent years,and studied the mechanism of rock picking with representative, so that it can scheme out one rock picker that is adap.