Development And Research For Hydraulic System Of Working Device Based On Tunnel Multi-function Operations Trolley

As a core component during the development process of the tunnel multi-functionaloperations trolley, hydraulic system and leveling mechanism are the effective guaranteeto realize support operations of “mechanization, automation and rapidity”. Especially forsuch harsh environment and multi-risk conditions in the tunnel support operations, itmust be an important consideration in the design to ensure the safe stability ofconstructors on the platform and the stability reliability of hydraulic system in the courseof their work, therefore analysis and research is particularly important based on linkageleveling mechanism and hydraulic systems of trolley.In this dissertation, surrounding a problem that the design and development ofhydraulic system must be stable and reliable, we have done a systemic and elaborateresearch on the tunnel multi-functional operations trolley. As fellows: pressure gradingand circuit design of hydraulic system, hinge point layout in hydrostatic linkage levelingmechanism, performance analysis and simulation of typical control circuit, prototypedebugging and testing, etc.1. According to design tasks and working conditions of the tunnel multi-functionaloperations trolley, we carried out the pressure grading for hydraulic system of workingdevice, and then analyzed in detail oil circuit characteristics of the six modules，finallydrew the entire hydraulic system schematic based on the chassis control circuit that hadbeen altered.2. Aiming at the flow distribution problem of linkage control circuit when thehydrostatic leveling system was optimal leveling position, a new and improvedalgorithms have been proposed based on traditional golden section method, which wasthe judgment operator intelligent shrink-election rotation method. After performingPeaks function verification, the algorithm was used to solve the layout optimizationproblem for pivot points of hydraulic cylinder group in leveling system. Thus when theplatform lifting stationarity became optimal, we’ve got the optimal leveling hinge pointposition and stretching the amount of change in the relationship between the boom andthe leveling cylinders. On the basis of the actuator main parameters, the flow distributionproblem of control circuit has been solved by calculating in optimal leveling position.3. Based on principles design and flow distribution in hydraulic system of trolley, we have already focused on the matching problem for valve selection, and explored howreliable and adaptation applicable typical control circuit made hydraulic cylinder actionbe achieved. For the most widely used of the speed control circuit in hydraulic system,we have deduced the static mathematical model of circuit in both speed-loadcharacteristics and speed-location characteristics for boom speed control circuit, andsummed up the influence law that performance parameters of speed control valve was tomotion stabilization of speed control circuit. In addition, we have also completedadaptive investigation to the important control circuit by the way of simulating actualworking conditions with AMESim and Matlab/Simulink co-simulation, and analyzedtwo major issues such as the synchronization error of double boom cylinder and theplatform lifting stationarity in the process of linkage leveling. The simulation resultsindicated that system control loop and valve selection could meet the requirements of theactual working conditions under the current design.4. The end of the article, we summarized the various problems encountered in thedebugging process, and carried out basic experiments and industrial trials aftercommissioning. The results showed that the performance indicators of hydraulic systembeing developed was consistent with expected utility, the platform lifting stationarity andthe stability reliability of hydraulic system could be guaranteed completely in thelong-specific inspection of the harsh working conditions.Combined with the actual project experience, the author had an In-depth study ofthe related issues in the design and development of hydraulic system for the successfuldevelopment of the domestic first tunnel multi-functional operations trolley.In sum, theprominent contribution of this dissertation was the establishment of a favorable base forsecond-generation model trolley.