Intermediate frequency furnace fault diagnosis needs to involve system analysis method

The so-called "fault diagnosis" of the intermediate frequency furnace is simply to find the faulty components of the intermediate frequency furnace. If it is necessary to pick out the failed or unqualified components from a batch of various types of electronic components that are isolated from each other, it is simple and The direct method is to carry out test inspection one by one. If the components and components have been fixed on the printed circuit board by soldering, an electrical relationship is formed between them. Since the total number of components in the circuit is large, it is obvious It is impossible and unnecessary to remove each component for testing and inspection. At this time, the entire circuit is generally regarded as a whole, and a series of inspection, analysis, testing, judgment, and fault finding components are found.

The basic links of the intermediate frequency furnace fault diagnosis include inspection, analysis, detection and judgment. In fact, the purpose of the inspection is to lay the foundation for the analysis, and the purpose of the analysis is to make a judgment. The process of fault diagnosis is a process of checking, analyzing and detecting interleaving, reciprocating, and successively approaching the fault point. The troubleshooting flowchart is shown in Figure 6-1.

 The maintenance diagnosis of the intermediate frequency furnace needs to involve the analysis method of the system and the use of professional testing methods. For this reason, the intermediate frequency furnace fault diagnosis technology can be used to examine, analyze and test the three basic links, and focus on the basic technical means and methods with commonality.

 In the process of fault diagnosis of the intermediate frequency furnace, the fault condition of a few electrical and electronic components can be found only by visual inspection, such as open circuit or short circuit, fuse blown, electrolytic capacitor burst and so on. In the actual fault diagnosis work, the fault diagnosis problem is often solved by the "intuitive method". However, this situation is contingent and does not have the universal meaning of failure analysis.

 The development of the design and manufacturing technology of the intermediate frequency furnace has made the types of intermediate frequency furnaces more and more, the functions are more and more perfect, and the structure is more and more complicated. Relatively speaking, the analysis and research on the fault diagnosis of the intermediate frequency furnace is far behind. The current situation is: in the manufacturing process of the intermediate frequency furnace, to solve the problem of fault diagnosis of the finished intermediate frequency furnace or semi-finished parts in the production line, there are many mature methods, and there are some commercial diagnostic equipments; Diagnosing problems of intermediate frequency furnace faults with different specifications and models is difficult to solve due to the complexity of the model, the lack of batch size, and the variable fault conditions. In most cases, traditional methods are still used, and there has been no substantial advancement in inspection, analytical methods, and detection techniques. Especially for the fault diagnosis of analog circuits, due to the nonlinearity of the circuit itself and the diversity of circuit configuration, the difficulty of fault diagnosis is greatly increased. Although the development of digital technology has gradually increased the proportion of various digital circuits in the intermediate frequency furnace circuit, the circuit parts such as detection, conversion, triggering and control in the intermediate frequency furnace cannot be completely digitized. It is precisely these circuits that cannot be digitized have a high probability of failure. Therefore, the fault diagnosis of analog circuits is always a difficult point and key point in the fault diagnosis of intermediate frequency furnaces.

The fault diagnosis of the intermediate frequency furnace is a comprehensive science involving many aspects of knowledge and technology. In addition to mastering the basic principles of the composition of the intermediate frequency furnace, electrical and electronic knowledge, component characteristics, it also involves electronic measurement technology. More importantly, the fault diagnosis of the intermediate frequency furnace is actually a fault analysis process, with a series of unique thinking methods based on system science and logic, with its own regularity and system.

The IF furnace fault diagnosis is a process from the unknown to the unknown, and therefore a scientific process. It starts from the known fault phenomenon and ends at finding the unknown fault location (fault point). The whole process generally needs to go through information collection, analysis and research, reasoning judgment, parameter test, and actual test verification. Therefore, master the intermediate frequency furnace fault diagnosis method, and often carry out the fault diagnosis practice of various intermediate frequency furnaces. The value is not only to repair several intermediate frequency furnaces, but more importantly, to improve their thinking ability, learn to observe, analyze, The scientific method of judgment, cultivate good thinking habits and indomitable spirit of exploration.