Core abstract: The thrust pad is made of steel billet babbitt (also known as black metal), which can be melted at the axle temperature of about 110 degrees, increasing the displacement space of the main shaft, so as to protect the main shaft from dry friction of the thrust pad caused by the large axial displacement of the main shaft. Next are tin bronze, and steel billet fluoroplastic (this material has a small friction coefficient, which is suitable for higher temperatures, and does not need to scratch the bearing, and will not burn the bearing due to oil failure). To ensure that the thrust pad operates under oil lubrication, the minimum oil film thickness of the oil outlet must meet the design value (for example, the oil film thickness of the thrust pad of large units is generally 0.03 to 0.07mm). This requires the mirror plate to have high precision and low roughness. If the mirror plate has high roughness, the bearing friction loss will increase. If the mirror surface has defects such as scars or rust
The thrust pad is made of steel billet babbitt (also known as black metal), which can be melted at the axle temperature of about 110 degrees, increasing the displacement space of the main shaft, so as to protect the main shaft from dry friction of the thrust pad caused by large axial displacement of the main shaft. Next are tin bronze, and steel billet fluoroplastic (this material has a small friction coefficient, which is suitable for higher temperatures, and does not need to scratch the bearing, and will not burn the bearing due to oil failure). To ensure that the thrust pad operates under oil lubrication, the minimum oil film thickness of the oil outlet must meet the design value (for example, the oil film thickness of the thrust pad of large units is generally 0.03 to 0.07mm). This requires the mirror plate to have high precision and low roughness. If the mirror plate has high roughness, the bearing friction loss will increase. If the mirror surface has defects such as scars or rust, it may damage the oil film, or even cause a tile burning accident. Therefore, mirror plate grinding, thrust pad scraping and maintenance and adjustment of mirror plate and thrust pad are very important. In addition, the mirror plate is required to ensure its waviness, and its parallelism is generally 0.02mm/m according to different units. The mutual height difference between thrust pads is generally controlled within 0.02mm, that is, the flatness of thrust pads is required to be close to that of mirror plate. If the flatness between the thrust pad and the thrust pad is poor and the deviation exceeds the minimum oil film thickness, the oil film established between the thrust pad and the thrust pad will be damaged. The thrust pad will operate under semi dry friction or dry friction, causing pad burning accident or pad surface damage. In addition, the force on the thrust pad is also directly related to its parallelism. Only when the contact area is large, can the thrust pad bear greater pressure. If the thrust pad is uneven, has local high points, and the force is concentrated, the pad burning accident or serious wear of the pad surface will also occur. As long as the thrust pad has good flatness and good contact with the mirror plate, the oil film is rapidly established between the thrust pad surface and the mirror plate when the unit starts, and the oil film thickness is always maintained without damage when the unit is running, the thrust bearing can be guaranteed to have good stability and safe and reliable operation.
(Editor in charge: editor in chief)
