The factors that affect the service life of the Conveyor Belt, and the method of improving the life
With the Conveyor Belt price competition more and more obvious, the conveyor accessories with the competition and the price, the overall quality of a significant decline, such as the drum, and some manufacturers can use the temporary use of small diameter wall can be a little thin, But there are still some places on these configurations do not understand that the price is cheap on the line, in fact, otherwise, for example, a diameter of 220 with a roller 2 years, then the 630 diameter will be able to spend 10 years longer, Down, what kind of cost-effective is obvious, the following put forward several factors affecting the life of the Conveyor Belt and improve the life of the method.
1 drive the drum diameter. Conveyor Belt around the drum will produce bending stress, causing belt fatigue. The smaller the diameter of the greater bending stress, obviously increase the diameter of the drum is conducive to improving the service life of the Conveyor Belt, but increased to a certain value, the bending stress is not obvious, but also make the device volume increases. Therefore, in order to ensure that the Conveyor Belt bending stress is not too large, should limit the minimum diameter of the drum. Selection of the principle of driving the drum diameter D is: multi-layer Conveyor Belt with mechanical joints, D ≥ 100i, mm (i for the canvas layer); the use of curing joints, based on the joints are trapezoidal lap, easy under the bending stress Peeling, so D ≥ 125i, mm. When using the mechanical connector, D ≥ K8, mm (k depends on the material with the core skeleton material; 8 for the core thickness, mm).
2 roller into the groove angle. The load branch is usually a three-row roller consisting of a grooved roller set whose side roll and middle roller are referred to as the groove angle. Within a certain limit, the greater the groove angle, the greater the amount of material flow. But when the groove angle exceeds the capacity of the Conveyor Belt itself, when the no-load operation, the Conveyor Belt will not be close to the roller, which led to the edge of the Conveyor Belt strong wear and unstable operation; heavy load operation, Conveyor Belt In the side roller and the middle of the roller will inevitably produce a large bending stress, so that the Conveyor Belt longitudinal break or canvas layer quickly stripped. Therefore, the design of the roller groove angle must be designed with the selected Conveyor Belt groove capacity consistent with the use of the replacement of the new Conveyor Belt should also comply with this principle. Normally the roller is taken as 30. , When the Conveyor Belt into the slot performance is good, can be increased to 35. The
3 overdue distance. The conveyor section between the head of the conveyor, the tail roller and the first set of carrier rollers is called a transition section. In the transition section the Conveyor Belt is changed from the groove to the parallel or from the parallel to the groove, the Conveyor Belt is stretched to produce additional tensile stress. The smaller the excess length, the greater the additional tensile stress, causing serious wear and tear on the edges of the Conveyor Belt and side rollers, resulting in premature fatigue of the Conveyor Belt and even breaking the edges of the Conveyor Belt. The length of the transition section should not be too small for the local elongation of the Conveyor Belt to extend beyond the Conveyor Belt.
4 convex arc radius. Conveyor line with convex arc, the Conveyor Belt through the edge of the existence of a large tensile stress, resulting in Conveyor Belt and roller too early damage, so convex radius should not be too small. When using steel cord Conveyor Belt, the convex arc radius should not be less than (75 ~ 85) B.
5 Feeding device. The structure of the feeding device is reasonable or not, to a large extent determine the Conveyor Belt life. In order to reduce the wear and impact stress on the Conveyor Belt, the technical requirements for the design of the feeding device are as follows: the size and direction of the material to the Conveyor Belt should be approximately the same as the belt speed; In particular, it is necessary to prevent the bulk material from falling directly from the very high level to the Conveyor Belt. The inside of the feeding device should make the material form a free continuous stream and allow the material to be evenly loaded into the middle of the Conveyor Belt in the correct shape. There is material accumulation and sprinkle phenomenon; as far as possible the first powder and fine pieces unloaded to the Conveyor Belt to form a cushion, and then block pieces. At the loading point, the buffer roller set should also be set to reduce the impact of the material on the Conveyor Belt. The location of the feed hopper must be such that the material falls between the two sets of buffer rollers, rather than falling in a set of buffers On the roller.