Solidco machinery co, ltd is a modern technology-oriented enterprise specializing in pump research and development, production and sales. the company cooperates with the engineers of the mechanical department of fudan university in shanghai and under the guidance of many professors such as zhejiang electromechanical design and research institute, jiangsu university and xi'an jiaotong university, the self-developed built-in frequency conversion all-stainless steel deep ell pump and permanent magnet frequency conversion deep well pump intelligent technology and mechatronics, the prototype has passed more than 8,000 hours of multi-environment simulation test, and has been successfully mass-produced