Automatic production line is the process of automatically operating or controlling according to the specified procedures or instructions without human intervention. Its goal is "stable, accurate and fast". Automation technology is widely used in industry, agriculture, military, scientific research, transportation, commerce, medical care, service and family. The use of automatic production lines can not only liberate people from heavy physical labor, part of mental labor and harsh and dangerous working environments, but also expand the functions of human organs, greatly improve labor productivity, and enhance the ability of human beings to understand the world and transform the world. Aejings bearings are also used in automated production lines, which can make machines run better.