Research On Vibratory Excavation Performance Improvement Of Excavator Based On Twin Spool Valve

Abstract:Since the application of vibration cutting technology in rock and soil drilling, domestic and foreign scholars have conducted a lot of research, made some breakthroughs in the study of the mechanism of drag reduction and vibration parameters on the drag reduction effect. However, these studies merely in the experimental stage, to make the vibratory cutting rock technology popularization and application, the control performance of the excitation system become important factors. In this paper, the Research priorities is the improved research and transplantation of the control performance and portability of vibratory excavation system of excavator based on Ultronics twin spool valve.(1) Firstly, research status of vibratory excavation in the engineering machinery at home and abroad were reviewed and summarized, analyzed the influence factors of vibratory excavation effect, key and Research on vibratory cutting technology application.(2) According to the working principle of twin spool electro-hydraulic proportional valve put the pressure and flow control strategy forward. Aiming at the problem of flow control and precision of the method for calculating the flow feedback is discussed, the method for improving the flow control performance by testing out the actual relationship between the valve flow coefficient and the flow area of the product and the spool displacement In this paper, it establishes an electro-hydraulic proportional control model of twin spool electro-hydraulic valve system, derived proportional transfer function amplifier, electro-mechanical conversion process and the pilot valve and main valve link, laid the foundation for the establishment of simulation model.(3) It establishes a AMESim-Simulink joint simulation model of vibration drilling system. And then, the dynamic characteristics of flow and pressure control and the control performance of different input waveform simulation analysis is carried out. In order to get the relationship between the bucket amplitude and flow rate amplitude and excitation frequency, a planar mechanism model of excavator working device is also build. Through the simulation and calculation can get this relationship, this method of simulation can make the system can also get this correspondence easily ported to other models, increases the portability of the system.(4) Through the method of experiment the relationship between the product of flow coefficient and the flow area and the spool displacement of the main valve of twin spool valve were tested. To make the correspondence in difference spool displacement be a two-dimensional table and input it to the controller can improve the accuracy of flow rate feedback, thereby improving the flow control performance. Then, the improved effect was verified by the method of experiment. The experimental results show that, this improvement can improve the flow of control performance of the system, then improve performance of vibration cutting excavation.