The Effect Of The Variable Load On The Pressure Of The Hydraulic Cylinder In The Throttle Speed Governing System With By-pass Oil Way

Use the throttle speed governing system with by-pass oil way in which the hydraulic cylinder was the executive as research object in this thesis , the trial research about the effect on the pressure p1 of the hydraulic cylinder chamber without piston-rod when series-connecting throttle or timing valve on the by-pass oil way under the step load changing have made.Accorded to the trial research, under different flow area of flow valve and different adjusted pressure of relief valve , conclusion that the regulation of the pressure pt of the hydraulic cylinder chamber without piston-rod varied with the change of step load were as follows:When the throttle was series-connected on the by-pass oil-line in the throttle speed governing system with by-pass oil way :Under the same fixed flow area , the same settled pressure adjusted by the relief valve and piston-rod in the same fixed position in the hydraulic cylinder , with the incremental value of step load, the pressure p1 highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod and the adjustive time all increased, meanwhile, it's time of rising and peak value time all decreased.Under the same settled pressure adjusted by the relief valve, piston-rod in the same fixed position in the hydraulic cylinder and the same fixed value of the step load, with the incremental value of the flow area of the throttle valve, the pressure p1 highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod and the adjustive time all decreased. At the same time , it's time of rising and peak value time all increased.When the timing valve was series-connected on the by-pass oil-line in the throttle speed governing system involving by-pass oil way :The dynamic changing rule of the pressure p1 of the hydraulic cylinder chamber without piston-rod is just like that of the Pressure p1 of the hydrauliccylinder chamber without piston-rod in the throttle speed governing system with the throttle series-connected in the by-pass oil wayThrough trial research, the calculation formula that the pressure highly-adjusted capacity of the hydraulic cylinder chamber without piston-rod varied with the change of step load and the formula about hydraulic elements main parameter (rated pressure) were both made, which had important valuation in selecting the main parameter about this hydraulic system.This thesis also have constructed mathematic model based on the analytic method, which used the load as input and the pressure as output. At the same time, it have made theoretic analysis of time response. The theoretic analysis was highly agreed with the experimental result.