Thrust Ball Bearings During operation
In the installation, operation must pay attention to the above requirements. Thrust bearing is a Michelle-type tile bearing, each tile of the cast surface cast tin-bearing alloy layer, bearing alloy layer thickness of 2.0mm, in the back of the tile there is a deviation from the center of the support of the center so the oil Under the action of the tile under the support beam swing tilt, so that between the thrust plate and the thrust pad to form a wedge gap, when the rotor rotation, the oil is constantly into the wedge gap, the formation of a compressive capacity of the dynamic pressure oil film to balance The thrust of the turbine thrusts and transmits the thrust to the bearing. As a result of the formation of oil film liquid lubrication, so the normal operation of the turbine, the thrust plate and thrust pad between the metal friction will not produce.
Mainly for insulation inspection, including thrust head and mirror plate, anti-weight and the upper frame, thrust head and rotor.
Requirements: Oil-free insulation resistance ≥ 1M Ω Insulation resistance after oil filling ≥ 0.5M Ω Insulation resistance after load bearing ≥ 0.2M Ω The effect of the insulation pad in the thrust bearing has the following aspects:
①, cut off the shaft current, to prevent the thrust of the tile surface of the lubricating oil film by the shaft current damage.
②, can make the thrust head and mirror plate connection more closely.
Thrust bearing post - installation inspection
When installing thrust bearings, check the verticality of the shaft and shaft centerline. The method is to fix the dial gauge to the end of the box, so that the surface of the table top in the bearing shaft ring raceway on the bearing, while observing the dial indicator, if the pointer deflection, indicating shaft and axis center line is not vertical. When the shell hole is deep, it can also be tested with an extended micrometer head. Thrust bearings installed correctly, the seat can automatically adapt to the rolling rolling, to ensure that the rolling body is located in the upper and lower ring raceway. If installed, not only the work of the bearing is not normal, and the mating surface will be severely worn. As the shaft ring and the seat and the difference is not obvious, the assembly should be careful, do not make mistakes. In addition, the thrust bearing seat and bearing hole between the hole should also leave 0.2-0.5mm gap, to compensate for parts processing, installation is not accurate caused by the error, when the operation of the bearing ring center offset, the gap To ensure that its automatic adjustment, to avoid touch friction, so that the normal operation. Otherwise, will cause severe bearing damage. The thrust bearing is mounted in the thrust bearing bearing of the front bearing seat and is subjected to the axial thrust of the rotor to ensure that the correct axial position of the rotor is maintained.
The bearing shell is horizontally divided, and the upper and lower halves are bolted and have a taper pin. The bearing shell is mounted in the thrust bearing bearing of the front bearing seat. The housing and the bearing are provided with positioning pins To prevent the housing from rotating in the circumferential direction. Each thrust bearing has two sets of thrust tiles, each with eight fan-shaped thrust tiles, the inner and outer arcs of the tiles are matched with the housing channel so that the tiles are positioned in the radial direction and the tiles are perforated by the cylinder To position.