Cable tray rollers are an important component of cable tray equipment. What are the design and usage characteristics of cable tray rollers? The design and use of cable tray rollers have the following characteristics.
The principle of average force per pass ensures balanced average force across the entire line of rollers, extending their service life. The arc of the track is the core part of the slide rail. The arc pressed in the previous pass should be effectively protected by the upper and lower rollers or cross rollers during the next pass of edge rolling and grinding.
The arc position of the cable bridge equipment material will inevitably change during the stretching process. R will become a triangle, the steel ball will not reach the bottom, and two-point contact will produce noise. When R increases, the mating track will vibrate, the slide rail track will be blurred, the force will be uneven, the slide rail will deform, and the service life will be shortened. The processing precision of the roller is the key. Therefore, a special tool is specially made under the projection equipment, which will be magnified 20 times for testing.
Cast iron rollers have a carbon content of approximately 2.5%-3.5%. They can be divided into four categories according to their main materials: ordinary cast iron rollers, high nickel-chromium infinitely cold-hardened composite cast iron rollers, high chromium composite cast iron rollers, and alloy ductile cast iron rollers. The common structures of cast iron rollers can be divided into three categories: matrix, cementite, and graphite. The matrix structure is mainly bainite, ferrite, pearlite, bainite, and martensite. Graphite in cast iron generally exists in two forms: flakes and spheres.
Ordinary cast iron rollers can be divided into chill-cast iron rollers, medium and low alloy infinitely chill-cast iron rollers, and medium and low alloy ductile cast iron rollers. Chill casting is a type of cast iron obtained by using the supercooling of molten iron and the chilling of the mold surface, forming a hard, wear-resistant white layer on the surface of the roller body. Chill-cast iron rollers can be divided into non-ductile cast iron, ductile cast iron composite materials, and core materials according to their manufacturing process and core materials. Infinitely cold-hardened cast iron rollers are a material between cold-hardened cast iron and gray cast iron. Graphite exists in the matrix structure of the roller body working layer, and there is no clear boundary between the roller body working layer and the core. Rubber rollers are this type of low-end roller. Ordinary cast iron rollers are mainly used in thin plate rolling mills, three-roll rolling mills, medium plate rolling mills, wire rolling mills, bar rolling mills, and section rolling mills.
Infinitely cold-hardened cast iron is a material between cold-hardened cast iron and gray cast iron. The matrix structure of the working layer of infinitely cold-hardened cast iron rollers contains uniformly distributed graphite. The graphite content increases with the increase of depth from the roller surface to the inside, and the hardness decreases accordingly. Therefore, there is no clear boundary between the roller working layer and the roller core, also known as high chromium nickel molybdenum alloy infinitely cold-hardened cast iron roller material. The matrix structure of the working layer of high nickel-chromium infinitely cold-hardened cast iron rollers contains a large amount of carbide, so it has high wear resistance. The presence of graphite in the matrix structure gives it good heat resistance and heat resistance, and it is widely used as finishing rollers for wide, medium, and thick plate rolling mills and strip rolling mills.