On July 3 2024, the 18-meter-diameter split three-row cylindrical roller slewing bearing for 3,500-ton cranes was successfully produced in Xin'an, Luoyang, Henan. This slewing bearing is a breakthrough in the domestic bearing industry in terms of size, design and manufacturing.

The slewing mechanism of the crane is the core component of the crane, which bears the lifting load and slewing function. Due to the constraints of the slewing bearing (turntable bearing), the slewing mechanism of heavy-duty cranes has always adopted a roller-type slewing mechanism. For cranes with the same lifting capacity, the dimensions of a slewing-bearing crane are about 20% smaller than that of a roller-type crane, and the weight of the crane is reduced by about 25%. A slewing-bearing 3,500-ton crane weighs 4,600 tons, which can save about 1,200 tons of material. , which can save more than 3 million yuan in material costs. The slewing bearing has the characteristics of small friction torque, easy maintenance, easy replacement, and long life. It is the best choice to replace the slewing mechanism.

During the product design and manufacturing process, we have overcome problems such as friction reduction design, unidirectional logarithmic curve modification and directional assembly of parallel rollers, precise control of intermediate frequency quenching of arc-shaped parts, and deformation during the intermediate frequency quenching process, and formed 2 invention patents. , 4 utility model patents.

The rolling off the production line of this bearing marks that Chinese companies have achieved new breakthroughs in the field of slewing bearings for marine engineering equipment, and the overall technology has reached the internationally advanced level.