(1) Spherical roller bearings were commonly used in the early design of rolling mill bearings, with two sets installed side by side on the same roll neck. This configuration was sufficient for the production requirements at that time and allowed rolling speeds up to 600 rpm. However, as rolling speeds increased, several disadvantages became more apparent. These included shorter bearing life, higher maintenance costs, lower product precision, significant wear on the roll neck, and excessive roll misalignment. As a result, this configuration gradually became outdated with the advancement of rolling technology. (2) The four-row cylindrical roller bearing combined with a thrust bearing has become a widely adopted solution in modern rolling mills. The cylindrical roller bearing is tightly fitted on the roll neck, allowing it to handle radial loads effectively. It offers high load capacity, a high limiting speed, and excellent precision. Additionally, its separable inner and outer rings make replacement and maintenance easier, reducing production costs and improving installation efficiency. The thrust bearing manages axial forces, and depending on the mill's operating conditions, different types can be selected. For heavy loads and low speeds, thrust roller bearings are used with minimal axial clearance. For high-speed applications, angular contact ball bearings are preferred, as they provide high-speed capability and help control axial play during operation. This configuration ensures longer bearing life, higher reliability, and better control over the quality of rolled products. It is now the most commonly used type, found in wire rod mills, sheet mills, foil mills, and double-support rolls in both cold and hot rolling mills. (3) Four-row tapered roller bearings are another popular choice in rolling mill designs. These bearings can handle both radial and axial loads, eliminating the need for separate thrust bearings and resulting in a more compact mainframe. The inner diameter of the tapered roller bearing is typically loosely fitted to the roll neck, making installation and removal convenient. However, this loose fit can sometimes lead to sliding creep, which is why the inner diameter is often machined with spiral oil grooves to improve lubrication and stability. This configuration remains widely used in various applications, such as work rolls in four-high hot and cold rolling mills, as well as in blanking machines and steel beam rolling mills.

Isomalto-oligosaccharide 900(corn) Powder

PRODUCT INTRODUCTION:

With corn starch as raw material, through the enzyme, after liquefaction, concentration, drying and a series of processes and gained white powder products, can promote bifidobacterium of the body significantly and have the functions of water soluble dietary fiber, low calorific value, prevent dental caries etc., so it is a kind of functional oligosaccharides used widely.

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