General principles of hydraulic system fault diagnosis for paper cutter manufacturers
        Correct analysis of failures is the prerequisite for troubleshooting. Most system failures do not occur suddenly. There are always warning signs before they occur. When the warning signs develop to a certain degree, a fault occurs. The causes of failure are various and there are no fixed rules to find. Statistics show that about 90% of the failures in hydraulic systems are caused by poor management. In order to diagnose faults quickly, accurately, and conveniently, it is necessary to fully understand the characteristics and rules of hydraulic faults, which is the basis of fault diagnosis.
        The following principles are worth following in troubleshooting:
      (1) First, determine whether the working conditions and peripheral environment of the hydraulic system are normal. First, it is necessary to find out whether the mechanical part of the equipment or the electrical control part is faulty, or whether the hydraulic system itself is faulty. Claim.
       (2) Area judgment Determine the area related to the failure based on the failure phenomenon and characteristics, gradually narrow down the scope of the failure, detect the components in this area, analyze the cause of the failure, and finally find out the specific location of the failure.
      (3) Grasp the types of failures for comprehensive analysis According to the final phenomenon of the failure, gradually find out a variety of direct or indirect possible causes. In order to avoid blindness, comprehensive analysis and logical judgment must be performed according to the basic principles of the system to reduce the number of suspects Gradually approach, and finally find the fault.
      (4) When verifying the possible cause of failure, generally start from the most likely cause of the failure or the easiest place to test, which can reduce the workload of assembly and disassembly and improve the speed of diagnosis.
      (5) Fault diagnosis is based on operating records and certain system parameters. Establish a system operation record, which is the scientific basis for preventing, discovering, and handling faults. Establish a device operation fault analysis table, which is a high-level summary of experience and helps to quickly judge the fault phenomenon. Make accurate quantitative analysis of failures.
        2.Troubleshooting methods for paper cutter manufacturers
        The traditional method of finding hydraulic system failures on a daily basis is to gradually approach the fault by logical analysis.
        The basic idea is comprehensive analysis and condition judgment. That is, the maintenance personnel judge the cause of the failure based on experience through observation, listening, touch and simple tests and understanding of the hydraulic system. When the hydraulic system fails, there are many possible causes for the failure. The logical algebra method is used to list the possible failure causes, and then make logical judgments one by one based on the principle of easy-to-fail, and then approach each item one by one, and finally find out the cause of the failure and the specific conditions that caused it.
        In the process of fault diagnosis, maintenance personnel are required to have basic knowledge of hydraulic system and strong analysis ability to ensure the efficiency and accuracy of diagnosis. However, the diagnosis process is cumbersome and requires a large number of inspections and verifications, and it can only be analyzed qualitatively. The cause of the diagnosis is not accurate enough. In order to reduce the blindness and experience of system fault detection and the workload of disassembly, the traditional fault diagnosis methods are far from meeting the requirements of modern hydraulic systems. With the development of hydraulic systems toward large-scale, continuous production, and automatic control, a variety of modern fault diagnosis methods have emerged. Such as the iron spectrum technique, the number, shape, size, composition and distribution of various abrasive particles that can be separated from the oil can be used to timely and accurately determine the wear position, form, and degree of components in the system. In addition, quantitative pollution analysis and evaluation of hydraulic oil can be performed to achieve online detection and fault prevention.
        Expert diagnosis based on artificial intelligence, which uses computer to imitate the methods used by experienced experts in a certain field to solve problems. The failure phenomenon is input into the computer through the man-machine interface. The computer can infer the cause of the failure based on the input phenomenon and the knowledge in the knowledge base, and then output the cause through the man-machine interface, and propose a maintenance plan or preventive measures. These methods bring broad prospects to hydraulic system fault diagnosis and lay the foundation for hydraulic system fault diagnosis automation. However, most of these methods require expensive detection equipment and complex sensor control systems and computer processing systems. Some methods are difficult to study and are generally not suitable for field promotion.

I. Features of Sheetfed Paper Cutting Machine:
1) The cutting format is generally between 920mm-2200mm;
2) Comprehensive control involving machinery, electrical appliances and hydraulic pressure;
3) A large number of cuts can be cut;
4) High precision of cutting;
5) Prices range from tens of thousands to hundreds of thousands of printing tools depending on the size and configuration of the cutting format.
Cutting process of sheet-fed paper cutter:
1) Determine the position of the pusher according to the size of the cut paper;
2) Position the paper that has been flushed against the front surface of the pusher and the side fence to position the paper;
3) The paper presser first lowers and compresses the paper, and then the cutter cuts down to cut the paper;
4) After cutting, the cutter leaves the paper stack and returns, and then the paper presser rises to reset the printing market.

        Paper cutting machine is a device for processing paper, which is generally used for the processing of paper types in paper mills and the refurbishment of prints in the printing industry. In addition, the paper cutter can also be applied to non-paper cutting. Paper cutters have a wide range of applications, ranging from printing and publishing industries to small photo studios and printing centers. From this we can see that paper cutters have a very large market share.
        So what should you pay attention to when buying a paper cutter? Ruian Maoyuan Machinery introduces you:
        First of all, to understand what types of paper cutters are currently on the market, they can be divided into two types according to the operation method, one is manual type, and the other is fully automatic type controlled by computer. Generally speaking, single-sided knives for manual paper cutters have a size of 52-150cm. In larger enterprises, choosing a computer-controlled paper cutter can better cooperate with digital printing because it can store data. When the processed items are processed again, they only need to call up the original program.
        In order to improve the service life of the cutter, the thickness of the cutting should not exceed the maximum cutting thickness. The adjustment of the pressure of the cutter should be determined according to the quality of the paper. The pressure of the harder paper should be less, otherwise Need more pressure. The electric paper cutter must keep the wind of the passerby, maintain and use the blade correctly, and once it is blunt, the blade should be reground, otherwise it will affect the cutting accuracy. In addition, be aware that the ambient temperature is between 19 and 23 degrees Celsius, not in humid environments. Under these conditions, the characteristics of the paper are relatively stable, which is good for cutting. This is because the determination of the cutting parameters is based on the characteristics of the paper, so under the external environment to ensure the stability of the paper cutter, it is also necessary to ensure the cut paper.

        With the rapid development of the paper processing industry, the concepts of the major printing and papermaking industries are rapidly updated, and they are willing to spend money on the configuration of cutting machines, but there are still some deep-rooted ideas. For example, in the use of paper cutters, some users may choose semi-finished blades, and some users choose finished blades, so what is the difference between them? The paper cutter manufacturers will answer them one by one:
        The difference between these two types of paper cutters is that one is not punched, there is no opening, and the other is directly usable. Why is this so? This is mainly due to the low level of processing in the early days of our country. Due to the different standards of paper cutters of various brands, it is very difficult to grasp the position of the row holes. In addition, the paper cutters in the factory are not unsealed mainly because The blade is easy to bruise, and some female and female users will choose semi-finished blades.
        Fortunately, at present, the industry is developed, and various brands of paper cutters have unified the specifications of the blades used. At the same time, paper cutter blade manufacturers basically use semi-automatic production, and it is rare for blades to be damaged. Therefore, at present, basically a finished paper cutter is used.
        Then again, there are many types of paper cutter blades, among which the high-speed steel blades and ordinary alloy steel blades are more common. How should we choose between these two?
        The choice of paper cutter is related to the production effect of the later products. And the actual value of the paper cutter is mainly reflected in the paper cutter. Therefore, the choice of paper cutter is very important. Therefore, Xiaobian recommends that you choose high-speed steel knives, mainly because high-speed steel knives are a kind of high hardness, high wear resistance, high heat resistance products, and are very suitable for making paper cutter blades. In addition, for ordinary alloy steel blades, high-speed steel blades have a much longer service life than alloy steel blades.

        Paper cutter is a very traditional product and plays a very important role in the paper processing industry. From the earliest mechanical development to the current program-controlled paper cutter, the later printing paper has become more and more efficient. At present, there are many types of paper cutters, such as program-controlled paper cutters, hydraulic paper cutters, digital display cutters, and so on.
        In the use of paper cutters, we should pay attention to the following issues:
        1. The paper cutter can not only cut paper, but also cut a variety of materials, such as leather and plastic, so when using a paper cutter to cut different materials, we should use different pressures and paper Machine blades to ensure that the products cut are of high quality.
        2. Whether the blade of the paper cutter is sharp or not is very important. An excellent paper cutter should maintain the sharpness of the blade so that it can effectively guarantee the work efficiency.
        3. Due to the development of science and technology and the needs of life, the paper cutter has been able to cut a variety of materials, and the reasonable use of the paper pressing mechanism can effectively solve the problem that the material cannot be fixed.