Construction Machinery Test Rig Hydraulic System Analysis And Device Test Methods Research

To meet the researching needs of mutually affects of the constructing machinery's work devices and work medium, we made the engineering machine multi-function experimental platform after analyzed some existing similar experimental platforms. On the foundation of elaboration to platforms mechanism, the performance parameter and the principle of work, this article analyzed basic principle, parameter matching of hydraulic drive system, and the system's primary device selects, the specification.On the foundation of analyzing hydraulic system principle, the paper studied speed characteristics of the hydraulic drive system, the analysis prove that after pass through the PID adjustment, through increase the proportional control constant of the controller, the flow gain of servo, the ratio coefficient of tachogenerator, the pressure of constant pressure network, the relieve coefficient of motor, reduced the useful effect area of variable cylinder to be possible to increase the system the speed rigidity. the article also analyzed dynamic characteristic of hydraulic drive system with emphasis, has established its mathematical model, and carried on the dynamic simulation, the simulation result indicate, dynamic performance of motor output angular also better, the system's adjust speed is quick, simultaneously, the speed control system has a better speediness and the dynamic stability.On the foundation of the analysis to the work principle and work way of accumulator In the constant pressure network, the paper has established mathematic model of the accumulator and the constant pressure variable displacement pump, and has carried on the dynamic simulation, analyzed the characteristic of accumulator and its influence to the constant pressure system.This article also studied the test method of rotate working device of the road machine. On the foundation of mechanical analysis and calculate to the mill digging machine mill, the paper discussed the mechanism of working of pavement milling machine, analyzed the factor which affect the work process and the work quality of milling machine, studied the testing method, conceived the tester and test system,...