Design And Dynamic Characteristic Research On The Crawler Traveling Mechanism Driven By Hydraulic Cylinder

Crawler crane is the multipurpose engineering machinery which is widely applied for large-scale construction engineering. It mainly lifts and loads materials of great mass, large size and those cannot be moved by normal machinery. Compared with other cranes, crawler crane has its own advantage of the particular traveling mechanism; therefore, the performance of the traveling mechanism has a direct impact on the performance of the entire crane and its market vitality.At present, most domestic and foreign large-tonnage crawler crane manufacturers tend to choose the traveling system driven by hydraulic motors and reducers. Although such driving pattern is rather mature, considering the actual usage of large-tonnage crawler crane, there is still some defects of this traditional driving pattern, such as the complexity of the support mechanism, high consumption of energy and high economic costs. Taking the750-ton crawler crane as a reference model, this paper will find methods to improve its traveling hydraulic system and use Simscape to do simulation studies on dynamic characteristics of the new system.Analyze the feasibility of the new hydraulic system to achieve the reference models traveling performance, and make a preliminary integrated design for the new hydraulic system.Establish the new traveling system model with the data-analyzing software Matlab. Based on Simscape, the hydraulic system simulation model is built and parameter settings as well as controlling methods are put forward.Simulate and analyze the traveling mechanism in Simulink environment and analyze how changes in time and pressure influence the hydraulic system through system pressure and flow which gets from sensors.Simulate and analyze the main factors that impact the dynamic characteristics of traveling hydraulic system and raise new requirements on hydraulic traveling mechanism control system of large crawler cranes.Consulting the simulation result, improve designs of new traveling hydraulic system on large crawler cranes. Reduce the impact of movements of the hydraulic cylinder commutation by reasonably use accumulator and transitional function of directional valve. By simulating crawler crane’s traveling hydraulic system, this paper made a significative attempt based on Simulink/SimHydraulic. The research output provides a theoretic base on leading design, improvement and optimizing of large crawler crane’s new traveling hydraulic system, and has a certain application prospect.