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Roller diameter selection and thickness calculation in roller conveyor
Published: 2015-3-26 11:46:01 Source: Conveyor http://shxierui.com Author: Hai Yu sound machine
The roller in the roller conveyor is a cylindrical part, divided into driving and driven rollers. It is widely used in rotary screen printing machines, digital printing and conveying equipment, and papermaking. The rollers in the roller conveyor are usually made of seamless steel pipes. Depending on the needs of different processes, such as aluminum alloy 6061T5, 304L / 316 stainless steel, 2205 duplex stainless steel, the same steel casting, solid forged alloy steel core For the material.
After the drum is formed, it needs surface treatment or coating such as spray painting, galvanizing, TEFLON spray coating, rubber coating, chrome plating, ceramic spraying and oxidation for the needs of rust, corrosion resistance, wear resistance and support. Classified according to size, there are large rollers such as papermaking machinery (the length can reach more than 10 meters. The diameter is more than 1500M), and small ones such as flat rollers on automatic conveyor belt conveyors (usually 1 meter long) Within), the diameter is 159MM.
Drum diameter selection: 25mm, 32mm, 38mm, 42mm, 50mm, 57mm, 60mm, 76mm, 80mm, 89mm. The principle of determining the diameter of the roller is that when the tensile stress of the endless conveyor belt is large, the additional bending stress should be smaller; on the contrary, when the tensile stress is small, a slightly larger bending stress is allowed, and a smaller roller can be used diameter.
Material selection of drum: carbon steel galvanized, steel carbon chrome plated, carbon steel coated, aluminum alloy, stainless steel, ABS, etc. Roller type selection: unpowered roller, single chain roller, double chain roller, "O" belt roller, tapered roller, grooved roller. Roller fixing method: spring-loaded type, inner pin type, full flat tenon type and through pin type.
The production of the drum is mainly a combination of the initial rolling of the roller body, the static balance of the initial calibration, the welding of the shaft head interference device, the fine turning and the dynamic balance of the precise calibration. If behavior tolerances such as roundness, cylindricity, and straightness are required to be less than 0.2MM, you need to grind on a cylindrical grinder or roll grinder after finishing turning. If the surface hardness is required, a heat treatment process needs to be added.
When conveying materials, the roller conveyor can also adjust the height of the mechanical legs according to the needs of the table to match the production of other conveying machinery and equipment . The thickness of the drum shell depends on factors such as the diameter of the drum, the length of the drum, the tension of the transport tape, and the wear during braking. The calculation of the thickness of the drum shell is very difficult, and the calculated value is generally small. Easy to manufacture. The thickness of the shell is generally thicker. After determining the thickness of the shell, the strength of the shell is checked. Because the shell is subject to normal and tangential loads, and the magnitude of the load is along the circumference of the drum, Varying, at present, there is no accurate calculation method for the calculation of the shell. Although the finite element calculation can give relatively accurate results, due to the lack of a general program dedicated to the calculation of the conveyor drum, it can only be performed on individual drums. Finite element analysis, the maximum stress of a cylindrical shell when the soft web is generally generated in the middle of the length of the cylindrical shell and outside the thickness of the cylindrical shell. In general, the stress can be expressed with approximate values with sufficient accuracy.
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