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Effect of high temperature on service life of spherical roller bearing
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| Time：2017.12.11 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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Generally, if spherical roller bearing is used correctly, it can be used up to its maximum life span. If it is not used correctly, there will be accidental premature damage. This early damage, relative to the fatigue life, is called the quality limit for failure or accident. It is due to the irregularities of installation, use, lubrication, or foreign invading from the outside.
The damage state of about spherical bearing such as roller spherical roller bearing card: wound ring, flange, the main reason is the lack of lubricant, not suitable for oil discharge structure defects, foreign invasion, spherical roller bearing installation error, shaft deflection, or the above reasons are.
Therefore, only to investigate the spherical roller bearing damage, it is difficult to know the true cause of the damage. However, if you know the spherical roller bearing the use of machinery, conditions of use, spherical roller bearing around the structure, understand the situation before and after the accident, combined with the damage and several reasons why spherical roller bearing study, it can prevent the recurrence of similar accidents.
Spherical roller bearing spherical roller bearing is very sensitive to the vibration damage, such as peeling, indentation, rust, crack, wear will be reflected in the spherical, roller bearing in measurement of vibration and so, by using spherical roller bearing special measuring gauge (vibration frequency analyzer etc) can measure the size of the vibration frequency, not by can be inferred from abnormal situation. The measured values are different due to the use conditions of spherical roller bearing or the location of sensor installation. Therefore, we need to analyze and compare the measurement values of each machine beforehand and determine the criteria.
The temperature of spherical roller bearing is generally predicted by the temperature outside the spherical roller bearing chamber. The temperature of the outer wall of spherical roller bearing can be directly measured by the oil hole, which is more accurate.
In general, the temperature of spherical roller bearing begins to rise slowly with the spherical roller bearing operation, and reaches a stable state after 1-2 hours. The normal temperature of spherical roller bearing varies with the heat capacity of the machine, the amount of heat dissipation, the speed and the load. If the lubrication and installation are not suitable, the temperature of spherical roller bearing will rise sharply, and there will be high temperature. At that time, it must be stopped and checked, disassembled and repaired. Conditional heat sensors can be used to monitor the working temperature of spherical roller bearing at any time, and to automatically alarm or stop operation when the temperature exceeds the specified value, so as to prevent fire shaft accidents.
After the spherical roller bearing is installed, it is necessary to check the operation to check if the installation is correct. Small machinery can be rotated by hand to determine whether it is smooth and smooth. The inspection items are mainly due to improper operation due to foreign bodies and indentation, unstable torque due to poor installation and poor processing of installation seats, which are caused by excessive clearance, installation error and seal friction. If there is no exception, it can start to run.
On the axis and in the spherical roller bearing seat, the spherical roller bearing requires a fixed position in three directions, such as radial, axial and tangential directions. Radial and tangential positioning is achieved through tight matching of spherical roller bearing rings. Axial positioning is applied only in a few cases. Tight fitting is generally used. Axial location parts are generally adopted, such as end cap and retaining ring, etc. the axial position is limited to the clearance range.
The following four points should be paid attention to when choosing coordination.
(1) spherical roller bearing ring circumferential surface should have good support and uniform force to reduce deformation and give full play to spherical roller bearing bearing capacity.
(2) the ring can not slide along the tangent direction in its matching surface, otherwise it will damage the matching surface.
(3) the free end spherical roller bearing must be able to adapt to the length change of shaft and spherical roller bearing seat hole, that is, it must have the ability to swim in a certain range to adapt to the axial position.
(4) it is necessary to pay attention to the easy installation and dismantling of spherical roller bearing, and save time and provincial expenditure.
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