Bearing fault detection and elimination methods
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| Time：2016.11.17 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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GENERATION OF VIBRATION IN BEARING Generally speaking, the rolling bearing itself does not produce noise. The "bearing noise" that is commonly perceived is in fact the sound effect of bearing vibration, either directly or indirectly, with the surrounding structure. This is why in many cases the noise problem can be considered as a vibration problem involving the entire bearing application.
(1) the amount of rolling due to changes in the load generated by the vibration: When a radial load is loaded on a bearing, the load bearing the number of rolling in the operation will be slightly changed, which caused the load direction of the shift . The resulting vibration is unavoidable but can be relieved by axial preloading to all rolling elements (not for cylindrical roller bearings).
(2) local damage: due to operation or installation error, a small part of the rolling bearing raceway and rolling may be damaged. In operation, rolling over a damaged bearing component generates a specific vibration frequency. The vibration frequency analysis identifies damaged bearing components. This principle has been applied to condition monitoring equipment to detect bearing damage. To calculate the bearing frequency, refer to the calculation procedure "Bearing frequency".
(3) the accuracy of the relevant parts: the bearing ring and the bearing or the shaft between the tight fit, the bearing ring may be associated with the shape of the adjacent components and deformation. If deformation occurs, vibration may occur during operation.
(4) Contaminants: If operating in a contaminated environment, impurities may enter the bearing and be rolled by rolling elements. The degree of vibration generated depends on the number, size and composition of the impurity particles being rolled, although no typical frequency form is produced, but a noisy noise can be heard.
Bearings in daily life, the need for careful attention to its use, let us look at the nine items we need to pay attention.
1, the harvester riveting parts such as a knife assembly, rivets are generally made of cold extrusion, riveting should not be heated, such as heating will reduce the material strength. Riveting after the application of forming heavy red willow to enhance the stability of the blade and the arbor.
2, vulnerable parts, especially pins, tablets, sets, horns in the maintenance can not be replaced by butter and more replacement parts and repair, such as prolonged use of wear and tear to the limit of the parts will cause other mechanical shortening of life .
3, there is no balancing machine shaft repair In the repair of a variety of shaft to be balanced, can be installed in the shaft end of a thrust bearing, clamped in the lathe on the three claws, the other end can withstand the top, such as lathe short, available center Frame to hold the other end mounted on the shaft of the deep groove ball bearings, calibration balance so far. But in the counterweight, with a screw tight, try not to use electric welding weight.
4, the maintenance of the material due to bearing a wide range of models, is not easy to purchase, the shaft can be used to waste processing At present, Chinas shaft is mostly 45 # carbon structural steel mainly quenched and tempered in the case of bad conditions, available Oxygen, earth furnace to heat the required parts to the red hair in the brine placed in Ukraine, according to demand.
5, in the processing of sets of parts as possible in the set of holes in the pull tank due to some parts of the harvester refueling is very difficult, where difficult to refueling available butter and heavy oil, except nylon sets. Where the use of nylon sleeve parts, it is best not to use cast iron, copper, aluminum instead, because the nylon sleeve to withstand a certain impact without deformation.
6, Pulleys and shaft keys and keyway repair should ensure that the size does not change in advance, can not increase the size of the key, otherwise it will affect the strength of the shaft, shaft keyway available welding filler welding in the old key reverse milling A keyway, pulley on the keyway can be set with a (transitional) approach, after the set, with countersunk head screw in the set of tapping on the tight key.
7, harvester hydraulic part of the maintenance Remove the distributor and the flow valve, with the pump on the pressure of the pipe fittings, hydraulic oil should be loaded into the second filter, exhaust, hydraulic assembly repair is mainly seals, and Seals are best removed and replaced.
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