1、Rolling friction force is small, stable performance is good;
2、The contact area is large and the elastic deformation is small;
3、The utility model has the advantages of effectively moving bodies, easy realization of high rigidity and high load movement;
4、The utility model has the advantages of flexible structural design, convenient installation and operation, and long service life;
5、The utility model has the advantages of small mechanical energy consumption, high precision, high speed and large carrying capacity;
