The unpowered roller conveyor relies on rollers to complete the transportation. It is suitable for all kinds of boxes, bags, pallets and other small items or irregular items that need to be transported on the pallet or in the turnover box. There are long rollers and short rollers. Two kinds. The roller surface of the long roller table has cylindrical, conical and curved surface shapes, and the cylindrical long roller table is the most widely used. The curved section of the roller table adopts conical rollers or double-row cylindrical rollers, which can make the goods turn. Short roller table can shorten the distance between the rollers and lighter weight. The roller table generally inclines slightly. When the article is heavier and the line is longer, in order to save effort when pushing the article, the slope can be 1-1.5%. If you want to make things self-slip, the slope can be increased to 2-3%. There are many factors that affect the size of the self-sliding slope, and most of them use experiments to determine the appropriate angle. When the line length is less than 10 meters and the article is lighter than 200 kg, it can be arranged as a horizontal line. The self-sliding roller table is not easy to control the sliding speed of the article, so the length is generally not large. The width of the roller table is 100~150 mm larger than the width of the article. The minimum radius of curvature of the curve section is 3-4 times the width of the roller table. The distance between the rollers is 1/3-1/4 of the length of the conveyed article, when the stability of the conveying of the article is required to be high. The distance can be 14-1/5 of the length of the conveyed article, and the diameter of the roller is determined by the size of the load.