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There are many shortcomings in these processing methods, such as clamping at both ends in two times, it is difficult to ensure the coaxiality of two turning, and the flexibility of roller rotation is poor, which will affect the service life of the roller.

In the structure of the bearing system, the sealing structure of the bearing is an important factor that cannot be ignored that affects the service life and running resistance of the roller. Because the seal is not good, the bearing is prone to failure40.

​At present, in engineering practice, people mainly choose to use deep groove radial ball bearings and tapered roller bearings.

This model is a key project of the national "Seventh Five-Year Plan," and its key technology, the "double-row staggered deep groove V-shaped roller set," has been patented. So far, more than 50 units have been put into use, including 11 units with an angle of 25 degrees, 5 units with angles of 26 to 28 degrees, and 2 units with an angle of 30 degrees, basically forming a standardized product that is at a leading level domestically.