Nippon Seiko Co., Ltd. (Headquarters: Shinagawa-ku, Tokyo, President Toshihiro Uchiyama, Representative Director, Executive Officer, hereinafter referred to as NSK), has successfully developed "High-reliability Spherical Roller Bearings with High-Performance Sealing Rings". The bearing can achieve a long life by preventing the intrusion of foreign matter under harsh working conditions and at the same time improve the installation accuracy of the bearing. The successful development of this product has contributed to the improvement of production efficiency in the mining industry. It is estimated that by 2018, the annual sales of this product can reach 1 billion yen.

Once the mine belt conveyor that is several kilometers or even 20 kilometers long has equipment failure or shutdown for maintenance, it will have a great impact on production efficiency. Therefore, although these devices have always been in a harsh environment surrounded by dust, it is still hoped that they can achieve high reliability of stable operation without stopping 24 hours a day, 365 days a year.

The rollers of this belt conveyor generally use spherical roller bearings to alleviate the deflection of the shaft caused by high load. Spherical roller bearings can be divided into two types: open type (without sealing ring) and sealed type (with sealing ring). Conventional open bearings are prone to early damage caused by foreign matter intrusion; sealed bearings can give full play to Its sealing performance ensures to prevent the intrusion of foreign matter, but it still has the problem of difficult management of the sealed space and the inability to measure the clearance when the bearing is installed on the equipment. Therefore, on the basis of ensuring the same size as the conventional product, NSK has developed a "high-reliability spherical roller bearing with high-performance sealing ring" that can give full play to the sealing performance and achieve a long life. The bearing can prevent early damage to the bearing due to the intrusion of foreign matter, and can also realize high-precision clearance adjustment during the installation stage of the NSK bearing.