The field of fault diagnosis for 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 are becoming more and more complicated. Especially with the increasing popularity of shaftless printing presses, the diagnosis and elimination of faults are becoming more and more difficult. On the other hand, current printing press maintenance personnel mainly rely on personal maintenance experience to troubleshoot the printing press. However, the full intervention of CNC technology, the mobility of maintenance personnel and the differences in technology have led to different differences in the judgment and elimination of the same type of failure by different maintenance personnel. At the same time, there is a binary division of mechanical parts and electrical parts in the maintenance division of printing presses, and the cause of the failure also has a difference between artificial and natural wear. Therefore, based on the accumulation of previous maintenance experience, combined with newspaper printing practice, the introduction of the case method into the maintenance of printing presses can overcome many difficulties, quickly find the cause of the failure, and resume normal printing. Case method Case method (also known as case-based reasoning method) is a newly emerging knowledge-based problem solving and learning method in the field of artificial intelligence. It demonstrates strong vitality to people with its unique reasoning style and successful application. This method is very close to the daily reasoning activities of human beings. It comes from people's cognitive psychological activities. It is different from traditional knowledge-based systems. The knowledge it relies on is mainly related to the specific problem solving in the related fields saved in the maintenance system Records, for example: hospital cases, metallurgical equipment maintenance records, etc. When a new fault 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 database for historical cases that are similar to the current problem and match it as much as possible The following system will provide several similar solutions. In practical applications, case-based reasoning can be divided into 4 steps. 1. Search: Search the case library for the case that is most similar to the new problem. 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. Correction: When the method provided by the system cannot solve the problem, the method must be corrected. 4. Save: add the corrected case to the case library. In short, the case method is to describe the problems that have been dealt with in the past as a case composed of the expression of the problem and the solution, and store it in the case database. When a new problem comes, the old case similar to it is retrieved from the case database. If the new problem is exactly the same as the old case, the solution of the old case can be used to solve the new problem. Otherwise, it is necessary to modify the old case to get a solution to the new problem. The solutions of general new cases should be saved in the case database, enrich the case database, and realize the automatic update of the case database. The way to realize the case method Generally speaking, the fault reasoning of the case method is an important part of the diagnosis of equipment faults. There are two ways to realize the method: semi-automatic and intelligent. The structure of the two is as shown below. Specifically, the realization of semi-automation is mainly through the use of computer and database technology, through manual continuous enrichment of records, intuitively show the previous experience, for future maintenance reference. The intelligent realization is mainly based on the sensor technology to automatically collect the fault signal on the spot, and directly display the cause of the fault and the possible causes through the database and the corresponding system. The only difference between the semi-automatic implementation and the intelligent implementation is whether the data is entered manually or automatically. In fact, the semi-automatic implementation method is the initial stage of the case method and the most commonly used method at present. This article mainly discusses this case method. The key to the establishment of the case method and the establishment and operation of the application case system is the completion of the case database and the accuracy of the data. Therefore, to establish and apply the case system, you must first build the case database. The initial case is derived from the experience of previous maintenance work. According to the description of the previous fault handling by the maintenance personnel, the failure case is established according to the case representation method. The characteristic index value of each failure case is used to describe. The case database is established using the relational database technology. We sort and classify the past experience, systematically summarize and organize, and finally express the experience in the form of a case and store it in the case library. Most cases can be stored in the library during development. As the experience continues to accumulate, the case The continuous addition of, the continuous improvement of the case base, and many cases need to be revised, so as to continuously improve the case base. Conclusion Through the actual use proof of the author's unit, the case method has the following advantages. 1. Provides a practical and scientific basis for equipment maintenance. By summarizing the maintenance records in the case database, timely purchase of vulnerable parts, reminding the printing press users to maintain key parts regularly, prevent man-made printing failures, reduce maintenance costs, and extend the service life of equipment. 2. Provide a basis for the scientific management of the equipment department. Due to the certainty and clarity of the case method, the judgment, maintenance and causes of equipment failures are very clear, which facilitates a clear division of labor between departments and reduces unnecessary waste of manpower and material resources. 3. It is applied to the field of fault diagnosis of printing machinery and equipment, and solves the problems faced by the development of fault diagnosis technology in the direction of automation and intelligence. Through the application verification of several printing equipment manufacturing enterprises, this method provides a more scientific guidance for the fault diagnosis and reasoning of printing equipment, and has higher application value. ZHONGSHAN GRUWILL HARDWARE CO.,LTD , https://www.zsgruwill.com