There are several major problems in bearing vibration damage

Vibration in the bearing In general, the rolling bearing itself does not produce noise. The "bearing noise" that is usually felt is in fact the sound effect of the bearing directly or indirectly vibrating with the surrounding structure. This is why many times noise problems can be considered as vibration problems involving the entire bearing application.

(1) Excitation caused by the change of the number of rolling elements: When a radial load is applied to a bearing, the number of rolling elements carrying the load will change slightly during operation, which causes the load direction to shift. . The resulting vibration is unavoidable, but can be mitigated by axial preloading and applied to all rolling elements (not for cylindrical roller bearings).

(2) Partial damage: A small part of the bearing raceway and rolling elements may be damaged due to handling or installation errors. In operation, rolling a damaged bearing component produces a specific vibration frequency. 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, please refer to the calculation program "bearing frequency".

(3) Accuracy of the relevant components: In the case of a close fit between the bearing ring and the bearing housing or the transmission shaft, the bearing ring may be deformed in accordance with the shape of the adjacent component. If deformation occurs, vibration may occur during operation.

(4) Contaminants: If operating in a polluted environment, impurities may enter the bearing and be crushed by the rolling elements. The degree of vibration generated depends on the amount, size and composition of the particles being crushed, although it does not produce a typical frequency form, but an irritating noise can be heard.

The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the bearing and the housing, the bearing and the shaft are broken, resulting in the axis deviating from the correct position and generating an abnormal sound when the shaft is moving at a high speed. When the bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.

Bearings need to be carefully watched for their use in daily life. Let's take a look at the nine things we need to pay attention to.

1. The riveting parts in the harvester are movable knife assemblies. The rivets are generally made by cold extrusion. They should not be heated during riveting. If heating, the material strength will be reduced. After riveting, the forming punch is used to strengthen the firmness of the blade and the shank.

2, vulnerable parts, especially the pin, tablet, sleeve, horn can not be replaced with more grease in the repair and repair, such as long-term wear and tear parts will cause other mechanical life reduction.

3. Shaft repair without balance machine When repairing various shafts to balance, a thrust bearing can be installed at one end of the shaft, clamped on the three claws of the lathe, and the other end can be used with a pointed top, such as a short lathe, available center frame Hold the SKF bearing mounted on the shaft at the other end and correct the balance. However, when using the weight, tighten it with screws and try not to use the electric weight to match the weight.

4. In the maintenance, due to the wide variety of material types of bearings, it is not easy to purchase. The used shafts can be processed. At present, most of the shafts in China are mainly made of 45# carbon steel. If quenching and quenching are required, in the case of poor conditions, Oxygen and earthen furnaces heat the required parts to the red and place them in the brine, depending on the needs.

5. When processing the sleeve parts, it is very difficult to pull the oil groove in the sleeve hole as much as possible. It is very difficult to refuel some parts of the harvester. Wherever it is difficult to refuel, butter and heavy oil can be used, except for nylon sleeve. Where the nylon sleeve is used, do not replace it with cast iron, copper or aluminum because the nylon sleeve is subjected to a certain impact without deformation.

6. The key and keyway repair on the pulley and shaft should ensure that the size is unchanged. In advance, the size of the key cannot be increased. Otherwise, the strength of the shaft will be affected. The keyway on the shaft can be repaired by welding filler in the opposite direction of the old key. One-key groove, the upper keyway of the pulley can be set by inserting (transition fit), and after inserting, use the countersunk screw to tap the key in the sleeve.

7. Repair of the hydraulic part of the harvester. Disassemble the distributor and reducer valve. Use the air pump to pressurize the pressure of each pipe. When the hydraulic oil is installed twice, it should be filtered and exhausted. The maintenance of the assembly hydraulic pressure is mainly the seal. The seal should be replaced and replaced.