Research On Alarm And Fault Diagnosis Expert System Of Flexible Coating Conveyor Line

Flexible vehicle coating production line is one of the four technologies in automobile production, and flexible coating conveyor line is the artery of flexible coating production line, the operation of which plays a crucial impact on the quality of automobile body surface coating. Accurate and real-time fault alarm and timely and effective fault diagnosis is the important guarantee of stable, efficient operation of flexible coating conveyor line, and which can effectively reduce the production cost of automotive body painting, improve the quality of coating on the surface of the automotive body. Flexible coating conveyor line alarm and fault diagnosis expert system which in SMS alarm way to automatically send the fault information in flexible coating conveyor line faults for fast positioning is constructed, and fault diagnosis expert system based on the fault tree analysis is used to fault diagnosis for finding out the reason of the fault accurately and effectively, and giving the trouble shooting.Firstly, this paper described the research status of flexible coating conveyor line fault alarm and diagnosis technology briefly; introduced the overall structure of the line and the composition and working principle the common equipment. The fault alarm key technology, fault tree analysis method and expert system are introduced. The design scheme of the expert system for the alarm and fault diagnosis of the flexible coating conveyor line is confirmed.Secondly, the overall structure and the hardware platform of the fault alarm system are introduced, and on the basis of which, the software design of fault alarm is introduced. The fault detection and classification, fault detection status acquisition, fault information storage, fault diagnosis and location and fault information to send is mainly included.Thirdly, the fault tree analysis method is studied. The common fault types of the flexible coating conveyor line are analyzed. The flexible coating conveyor line fault tree is established by using the deductive method. The fault tree is displayed and stored by using VB and database. The qualitative analysis and quantitative analysis of fault tree are carried out by using computer. The descending method combined with the prime method of is used to solve the fault tree minimal cut sets in qualitative analysis. The minimum cut set probability, top event probability and minimal cut sets are calculated in quantitative analysis. Combined with the research of expert system, the flexible coating conveyor line fault diagnosis expert system based on fault tree analysis is set up. The key parts of the expert system are designed, including the design of fault knowledge base, reasoning machine and machine.Finally, the friendly man-machine interface of flexible coating conveyor line alarm and fault diagnosis expert system is developed by VB. The SMS group sending of fault information, computer aided fault tree analysis, fault diagnosis and fault recording function is realized. The system has achieved the function of the flexible coating and transmission line timely alarm and fault diagnosis through on-site verification.