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| Conveyor folds causes and influencing factors | |||
| Author:admin Source:Original Updated:2013-7-18 | |||
Rubber conveyor belt during use sometimes wrinkled, powerful today to tell you about the belt this week as well as the causes and canvas soaked meridional curvature relationship.
Belt conveyor in agriculture and irrigation, industrial and mining and transportation are widely used to transport a variety of solid bulk and powdered materials or items, continuous, high efficiency, large angle transport, with safe operation, easy to use, Maintenance is easy, cheap freight, etc., and can shorten the transport distance, reduce project cost, saving manpower and material resources. Multilayer fabric conveyor belt in the actual operation, after the roller surface, often due to bending, conveyor non-working surface wrinkle easily, resulting in non-face rubber early peeling, delamination between layers from the dark, serious due canvas subjected to compression force of the damaged, causing transverse conveyor tear. In China, the conveyor belt bend conveyor wrinkling problem has long plagued the manufacturer, has not been completely resolved. This paper analyzes the minimum pulley diameter and curl the relationship between the proposed production of high curl canvas necessity. Causes of conveyor wrinkling Assuming Drum diameter Ф = 400mm, i.e. R = 200mm; canvas layer thickness between 1mm, 5-layer canvas belt, belt length difference between the inner and outer canvas = 5/200 = 2.5%. This means that through the cylinder, the outer canvas must be smaller than the inner belt elongation of 2.5% more, or else bound to the inner compression wrinkling. After the elongation of the canvas is assumed as 15%, breaking strength of 225N/mm, canvas tensile curve is linear, and thus each 1% elongation canvas, canvas force increases 15N/mm. If the belt inner elongated negative, it means that the inner belt folds appear. Obviously the more belt layers, the inner belt is easy to wrinkle, and the resulting compressive force, is caused by damage to the main conveyor. If the tensioner roller diameter is 300mm, will appear 1.3% of the amount of compression. If the curl of the canvas improved, so that the canvas also improved elongation at break. If the actual load is less than the conveyor design load, or design safety factor, or conveyor load time is longer, curl choice should be higher than the calculated value. Also note that said roller also includes a minimum return of tensioning rollers. At present, the production of high crimp dipped canvas belt used, the general tenter dipping, so the canvas can be controlled relatively high degree of curl and, if necessary up to about 10%. In using tenter dipped canvas conveyor belt production process, I recommend attention to the following questions: 1 tenter dipping process on both sides of the canvas have a slight edge loose phenomenon, width wider, more prone, but a normal phenomenon. (2) does not recommend using the flattener conveyor belt production process and prevent the slight edge on both sides loose phenomenon, molding, laminating fabric layer bad, causing belt surface irregularities such phenomena occur. 3 vulcanization vulcanization under pressure in the warp direction of the fabric may be a certain elongation, recommend appropriate vulcanization plus a certain tension to prevent belt vulcanization slight "transverse waves." 4 cold conveyor stereotypes, it is not recommended for high tensile stress. 5 high curl canvas is a meridional heat shrink significantly lower than traditional canvas, and latitudinal shrink significantly higher than traditional canvas products, the absolute prohibition canvas mix with the ordinary series, or belt will appear insufficient strength, surface severe The "longitudinal waves" and "transverse wave." 6 curl higher modulus canvas lower adhesion peel test, the adhesive strength test data will be reduced. Dipped canvas belt with meridional curl is a very important indicator, it will seriously affect the life of the belt. Canvas belt layers with curl, load, drum diameter correlation can be estimated by the formula the basic canvas curl. | |||
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