Kunlun Policy Research Institute is a comprehensive strategic research and consulting service institution initiated by the army and some local veteran comrades, experts, scholars and entrepreneurs. This is an independent research institution, following the national constitution and laws, adhering to the creed of being responsible for the country, society and customers, telling the truth, telling the truth, and worshiping the objectivity and fairness of research value. Mechanism refers to a component system formed by two or more components through movable connection. According to the difference of relative motion between components, mechanisms can be divided into planar mechanisms (such as planar linkage mechanism and cylindrical gear mechanism). ) and spatial mechanisms (such as spatial linkage, worm gear and worm mechanism, etc. ); According to the type of kinematic pair, it can be divided into low pair mechanism (such as linkage mechanism) and high pair mechanism (such as cam mechanism).