Factors influencing flow response characteristics of loadsensitive pumps used on scrapers
                                                                                          LIN Guangxu
                               (China Coal Technology & Engineering Group, Taiyuan Research Institute, Taiyuan 030006, China)

Abstract: In order to solve the problem that the structural parameters of the loadsensitive pump affect working characteristics of scraper, and provide a theoretical reference for its structural optimization, the effect of the structural parameters on the pump output flow was studied. The working principle of the loadsensitive pump was analyzed, its hydraulic control system was established, and the transfer function of the output flow and output pressure was derived, based on structural parameters such as spool diameter, spring stiffness and bypass orifice diameter. The AMEsim model of the hydraulic control system was performed to verify the dynamic flow response characteristics. The results indicate that the proper increase in the spool diameter, spring stiffness, and bypass orifice diameter can help improve the flow response speed, and its stability and the excessive increase can cause the output flow of the system to oscillate during the stepdown process.

Key words: load sensitive; flow response; structural parameters; AMESim; step response