Regularly adding lubricating grease to double-row angular contact ball bearings is the key to ensuring their smooth operation. The lubrication methods include filling the housing internally and connecting the pipes. Lubrication can not only reduce friction and wear, but also effectively prevent the erosion of dust and rust. Secondly, rust prevention is also an important measure to protect the performance of double-row angular contact ball bearings. The immersion method (immersing the bearing in rust-proof grease so that a layer of rust-proof grease adheres to its surface), the brushing method (brushing a layer of paint on the bearing surface), and the spraying method (spraying paint on the bearing surface is also an important rust prevention method)