Troubleshooting of printing machinery and equipment

As we all know, due to the complex structure, high degree of automation, and diversified functions of newspaper presses, equipment failures have become more complicated. Especially with the increasing popularity of non-shaft printing presses, it has become increasingly difficult to diagnose and eliminate faults. On the other hand, current printer maintenance personnel mainly rely on personal maintenance experience to eliminate press failures. However, the full involvement of CNC technology, the mobility of maintenance personnel, and the technical differences have led to great differences in the judgment and exclusion of faults of the same type by different maintenance personnel. At the same time, there is a dual division of labor between the mechanical and electrical parts of the maintenance division of the printing press, and the cause of failure is also the difference between man-made and natural wear. Therefore, according to the past accumulation of maintenance experience, combined with the actual printing of newspapers, the introduction of the case method into the maintenance of the printing machine can overcome many difficulties, quickly find the cause of failure, and resume normal printing.

Case method

Case method (also called case-based reasoning) is a newly emerging knowledge-based problem solving and learning method in the field of artificial intelligence. It presents people with strong vitality with unique reasoning style and successful application. This method is very similar to human daily reasoning activities. It comes from people's cognitive mental activities. It is different from traditional knowledge-based systems. The knowledge it relies on is mainly related to the problems that were previously solved in the related fields preserved in the maintenance system. Records, such as: cases in hospitals, maintenance records for metallurgical equipment, etc.

When a new failure occurs, we can describe it as a new case that does not know the cause and solution and provide it to the system. The system will search the case base to search for historical cases that are similar to the current problem to match it. In many cases, The next system will provide several similarity schemes. In practical applications, case-based reasoning can be divided into four steps.

1. Search: Search for the case that most closely resembles the new question from the casebase.

2. Application: Apply the method provided by the system to new problems. If the case is sufficiently similar to the new problem, the new problem is expected to be resolved.

3. Fix: When the method provided by the system cannot solve the problem, it must be corrected.

4. Save: Add the revised case to the casebase.

In short, the case law describes problems that have been dealt with in the past as cases that are composed of problem descriptions and solutions, and are stored in the case base. When new issues arrive, similar old cases are retrieved from the case base. If the new problem is exactly the same as the old case, the solution to the old case can be used to solve the new problem. Otherwise, the old case needs to be modified to get a solution to the new problem. The solution to the general new case needs to be saved in the case base, enrich the case base, and automatically update the case base. The Way to Realize the Case Law In general, the fault inference of the case method is an important part of realizing equipment fault diagnosis. There are two ways to realize it: semi-automatic realization and intelligent implementation.

Specifically, semi-automation is mainly achieved through the use of computer and database technology, manual enrichment of records, and intuitive display of past experience for future reference. Intelligent implementation is mainly based on sensing technology, automatic collection of fault signals on site, through the database and the corresponding system, directly shows the cause of the failure and the possible causes. The only difference between the semi-automatic implementation and the intelligent implementation is whether the data entry is manual or automatic. In fact, the semi-automated method of implementation is the initial stage of the case law and it is also the most commonly used method at present. This paper mainly discusses the case method. The establishment of the case law and the establishment and operation of the application case system, the key lies in the completion of the case base and the accuracy of the data. Therefore, to establish and apply the case system, the case base must be constructed first. The initial case is based on the experience of past maintenance work. According to the description of past fault handling by maintenance personnel, the fault case is established according to the case representation, and the characteristic index value of each fault case is used to describe the value. The relational database technology is used to build the case base.

We categorize and classify past experience, systematically summarize and organize, and finally present our experience in the form of cases and store them in the case base. Most of the cases can be stored in the development, and as the experience continues to accumulate, the case Constant additions, continuous improvement of the case base, and many cases need to be revised to continuously improve the case base.