Factors that cause circular vibrating screen bearing damage

1. Improper selection of circular vibrating screen bearing and bearing seat hole: The matching tolerance of the bearing and the bearing seat hole is during the arrangement. If a larger interference fit is selected, the bearing raceway particles will be forced to bend geometrically, and abnormal vibration will occur during operation; if a larger space fit is selected, the outer ring of the bearing will slide relative to the bearing seat hole, causing the bearing to heat up sharply and be damaged.

Circular vibrating screen

Treatment method: Select the appropriate matching tolerance, the inner ring of the bearing and the shaft should adopt a loose transition fit or space fit tolerance, and the outer ring and the bearing seat hole should adopt a tighter transition or slightly smaller interference fit tolerance.

2. The lubrication and sealing structure of the circular vibrating screen is improperly arranged: At present, most vibration motor bearings adopt grease lubrication and labyrinth seal structure, and the sealing space is usually 1-2 mm. However, in actual application, as the temperature of the vibration motor bearing increases, the viscosity of the lubricating oil gradually decreases, the main shaft rotates at high speed, and the lubricating oil in the labyrinth cover leaks continuously from the labyrinth cover, causing the bearing to be damaged due to lack of lubrication.

Due to improper arrangement of the lubrication and sealing structure, the bearing is not lubricated as much as possible, which is an important factor causing the bearing to bend and burn due to heat.

Treatment method: adopt thin oil lubrication, modify the lubrication channel, and transform the sealing structure. At present, many companies adopt thin oil circulation lubrication, and the structure of labyrinth seal combined with other non-contact seals.

Vibrating screen

3. The expansion and contraction of the shaft was not considered during the arrangement: the operating temperature of the vibration motor is usually 35-60℃, because the expansion and contraction of the shaft caused by thermal expansion and contraction cannot be ignored.

Treatment method: Arrange one end of the bearing into a transition or space fit so that the vibration motor shaft can slide relative to the inner ring during thermal expansion and contraction.

4. Improper selection of bearing model: The application category, maximum speed, installation configuration size, clearance, self-lubricating quality of the bearing are higher. Ordinary bearings are easily damaged under harsh working conditions. If the bearing model is not properly selected at the beginning of the arrangement, the bearing cycle will be shorter.

Solution: Choose bearings. The commonly used circular vibrating screen bearings usually have cylindrical roller bearings and spherical roller bearings. Both have a large radial load capacity. The former can withstand a higher maximum speed and has a strong load capacity for dynamic and static loads, but has a higher coaxiality for the bearing seat hole; the latter has a self-aligning performance and can compensate for the different shaft troubles caused by the treatment of the bearing seat hole, but cannot withstand pure axial loads.