Teach you how to extend the service life of bearings

Bearing bearings and seals are essential if they are used in harsh environments because they prevent dirt ingress and extend bearing life. The rolls in the mill are typically supported by four rows of sealed tapered roller bearings. It is required to withstand strong impact loads, intrusion of water and debris.
Ultra-easy to seal clean roll neck bearings developed by NSK Japan. This type of bearing has a 34% increase in load under severe lubrication conditions, high reliability, long life and easy maintenance. This performance improvement is the result of optimized mechanical design, new materials and patented sealing technology. Compared to conventional roll neck bearings, this sealed roll neck bearing not only increases the basic dynamic load rating by 34%, but also extends life by 2.7 times.
The second factor in improving the performance of the ultra-capacity sealed cleaning roller neck bearing is the use of Super-TF bearing steel developed by NSK. This material solves the problem of bearing life under conditions of contamination or under-lubrication. Experience has shown that under contaminated operating conditions, bearings are susceptible to contamination by debris intrusion. NSK's research shows that bearing life under contaminated or edge-lubricated conditions can be improved by improving the microstructure of the bearing steel. The new sealing structure is the main seal and the hole seal.
The negative pressure generated in the bearing can cause water to intrude from the main seal, and the structure of the hole seal has a great influence on the negative pressure. Therefore, reducing the negative pressure in the bearing is a basic requirement to prevent water from entering. The most effective method is to make the hole seal not directly in contact with water, while retaining the original function of the hole seal - preventing water and dirt from invading from the side of the roll neck. The sealing method uses surface contact instead of line contact. Whether it is running or stationary, the surface contact hole seal has good sealing performance. Therefore, the new ultra-capacity sealed cleaning roller neck bearing has higher reliability than the conventional sealed roller neck bearing.
In addition, SKF Italy Seals has recently developed a new generation of oil and grease seals Mud Block. Its optimized design of the sealing structure can effectively prevent the intrusion of dirt. The conventional sealing structure has a radial sealing lip, a clamping spring between the outer diameter and the race, and a fixed sealing ring. The new structure has a push baffle between the bushing and the seal ring. The outer surface of the seal ring and the inner diameter of the bushing are rubber, and the inner lip is pre-lubricated with waterproof grease. Mud Block can be made from a variety of elastomeric materials depending on operating conditions and application requirements. These materials include: nitrile, polyacrylate, fluorinated synthetic rubber, etc.

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Process characteristics for judging the vibration of imported bearings and the temperature of imported bearings

First, the vibration of imported bearings

The vibration of the imported bearing is very sensitive to the damage of the imported bearing. For example, peeling, indentation, rust, crack, wear, etc. will be reflected in the vibration measurement of the imported bearing. Therefore, by using a special bearing vibration measuring device (frequency analyzer, etc.) The magnitude of the vibration is measured, and the specific situation of the abnormality cannot be inferred by the frequency division. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.

Second, the temperature of the imported bearings

The temperature of the imported bearing is generally estimated by the temperature outside the bearing. If the oil hole can directly measure the temperature of the outer ring of the imported bearing, it is more suitable.

Usually, the temperature of the imported bearing rises slowly as the bearing starts to run, and reaches a steady state after 1-2 hours. The normal temperature of the imported bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the temperature of the imported bearings will rise sharply, and abnormal high temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions.

The thermal sensor can be used to monitor the working temperature of the imported bearing at any time, and automatically alarm or stop the occurrence of the burning shaft accident when the temperature exceeds the specified value.

The use of high temperatures often indicates that the bearing is in an abnormal condition. High temperatures are also detrimental to the lubricants of imported bearings. Sometimes bearing overheating can be attributed to the lubricant of the bearing. Long-term continuous rotation of the bearing at temperatures above 125 °C will reduce bearing life. Causes of high temperature imported bearings include: insufficient lubrication or excessive lubrication, lubricants. Containing impurities, excessive load, loss of imported bearings, insufficient clearance, and high friction caused by oil seals.

Therefore, it is necessary to continuously monitor the temperature of the imported bearings, whether it is measuring the bearing itself or other important parts. If the operating conditions are the same, any temperature change can indicate that a fault has occurred.

The periodic measurement of the temperature of the imported bearing can be carried out by means of a thermometer, such as a digital thermometer, which can accurately measure the temperature of the imported bearing and display it in °C or Fahrenheit.

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