Fault Diagnosis of Roller Bearing of Newspaper Printing Machine

With the progress of the manufacturing industry, printing machine manufacturing technology continues to improve. However, because the design accuracy of the printing press is often higher than the printing precision required by actual production applications, equipment managers often ignore the maintenance problems of the printing press, especially the maintenance of the bearings. When serious problems occur, the accuracy of the printing press is often already affected. Damage, even unable to recover, causing economic losses. In the following, the author starts from the concept of "the process of losing the accuracy of the printing press cylinder bearing is the process of losing the printing precision of the printing press", combined with years of production practice, to talk about the diagnosis and prevention of the printing press cylinder bearing failure.

1. Accuracy of roller bearing and printing accuracy of printing machine

Before the failure of the printing press cylinder bearing, indirect or direct will be reflected in the operation and product, but it has not attracted our attention. Sometimes the method of increasing the roller lining is used to solve the problems of printing pressure and uneven ink color, but the printing machine will have the problem that it cannot reproduce more than 80% of the dot level.

There are roughly two types of failures in roller bearings of printing presses we encounter. One type is the fracture of the support frame, the peeling of the track surface of the inner ring and the outer ring, which causes the ball to move poorly, causing mechanical lock. This type of failure has obvious performance. The printing machine must be repaired before it can run normally. In fact, this type of fault already existed in another type of fault before it caused severe mechanical lock, namely the wear of the track surface of the support frame, inner ring and outer ring. This type of fault performance is not obvious, mainly affecting the printing quality, but also In the maintenance of printing presses, it is often not easy to cause failures that people pay attention to, because the printing presses can still operate normally at this time. During the web printing process, when the paper tape breaks and wraps around the cylinder, the force on the entangled part suddenly increases, resulting in lubrication failure and local damage to the bearing, which increases the clearance of the damaged part of the bearing and causes printing Uneven surface pressure. If the lubrication is in a semi-failure state for a long time, the bearing surfaces of the inner and outer rings of the bearing will increase the bearing clearance due to long-term wear, which is usually manifested by insufficient printing pressure, uneven ink color, and solid brushing. At times, less than 30% of the dots of the printed matter are lost, and more than 70% of the dots are pasted.

Some of the faults caused by printing machine cylinder bearings can be compensated by operation, while others cannot be compensated by operation. This involves the problem of the need to perform cylinder bearing maintenance. Each printing machine has its fixed printing accuracy indicators, such as dot reproduction and overprint accuracy, when manufacturing and leaving the factory. These indicators are the basis for us to determine the quality of the printing. Observing the printed matter, we can also roughly determine the printing accuracy that can be achieved by the printing machine. Based on whether it can produce the required accuracy of the printed matter, we can determine whether it needs to be repaired, which is described in this article. The principle of "printing machine roller bearing accuracy is the printing machine printing accuracy".

Second, the prevention of printing press roller bearing failure

By analyzing the failure of the printing press roller bearing, it can be seen that to prevent the loss of printing press roller bearing accuracy, first select the type of lubricant used in the printing press and replace it in time; The working state of the printer often maintains the tension system of the printing machine to stabilize the tension output, so as to reduce the occurrence of the paper tape breaking and winding the cylinder during the printing process. In addition, the selection of suitable raw materials is also an effective way to reduce the failure of printing press cylinder bearings.

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