chain flexibility
2.Scheme of a new type and energy saving pump unit system is presented in allusion to these problems of beam-pumping unit, such as long driving chain, poor flexibility and low efficiency, stoke and time of stoke discommodious regulated. It is driven by linear induction motor (LIM) that is designed by "the principle of electrical cannon";
3.To improve the flexibility, reliability and responsibility of enterprise, a dynamic model of supply chain was constructed.
