Study On Fault Diagnosis Of Concrete Pump Hydraulic Based On Fuzzy Fault Tree And Maintenance Strategy

Concrete pump has the advantages of high flexibility, high efficiency and high degree of automation. And it plays a very important role in national economic development and infrastructure construction. The hydraulic system of concrete pump is large and complicated, and its working conditions are bad, which need high reversing frequency and so on. The hydraulic system of concrete pump is always suffering serious vibration and shock, which lead to the failure forms and failure reasons are diverse. And just through the failure phenomenon, the cause of the problem is difficult for us to know. Therefore, the concrete pump hydraulic system fault diagnosis research is of great significance to improve its running efficiency.The fault tree analysis method is an effective tool to analyze the reliability and security of the large and complicated system. The traditional fault tree analysis method cannot deal with problems which are fuzzy. However, the fuzzy theory is often used to deal with the fuzzy problem. As a result, we combine the fuzzy theory with the fault tree analysis method, and put forward a method that based on both. It has important theoretical value and practical significance for hydraulic system research.First, this paper introduces both the basic knowledge and the steps of the conventional fault tree analysis, and the qualitative analysis and quantitative analysis. It always introduces the basic content of fuzzy theory and the methods of fuzzy transformation, then, puts forward the idea of constructing fuzzy matrix. Next, the structure and working principle of the concrete pump pumping and swinging hydraulic system is introduced. Then, their fault phenomenon and the causes of the problems are introduced, according to which, the fuzzy fault tree of both hydraulic systems are established. At last, the first search strategy is researched by using the example of pumping and swinging hydraulic system failure.Secondly, this paper introduces the application steps of the AMESim simulation software, and based on the AMESim simulation platform, we build models of stack overflow valve,cartridge valve, hydraulic operated directional valve, hydraulic cylinder and pump load part in pumping hydraulic system. In order to make the simulation models has the same job characteristics with the actual system set up the related simulation parameters. Then, Pumping hydraulic system is established on the basis of overall AMESim simulation model, and the whole model simulation results are analyzed; Swinging hydraulic system AMESim simulation model is established, by analyzing the curve, the accuracy of the model is verified.Finally, in this paper, the concrete pump hydraulic system fault statistics are analyzed. And the importance of daily maintenance of concrete pump hydraulic system is pointed out. Then, the writer puts forward the key parts of the hydraulic system of inspection maintenance, which has great significance for ensure the normal operation of equipment, reduce the failure rate and improve the working efficiency of the equipment.