There are double seals for ball baring unit and it is normally pre-greased for working in the condition of dust, slob and causticity.

• 带座外球面轴承一般为预填装润滑脂，采用双层密封形式，适合在粉尘、泥水、腐蚀性介质的场合内使用，利于主机工作。