The roller is a key component on the belt conveyor, it is distributed along the full length of the conveyor, the amount is large, the weight accounts for about one-third of the weight of the whole machine, and the performance parameters of the belt conveyor have a close relationship with the performance of the roller, and its running resistance, noise during operation and vibration of the conveyor belt are also related to the support. Therefore, the research and development of high-performance pallets is one of the keys to the design of long-distance belt conveyors.
However, most of the domestic rollers used at present have the phenomenon of premature failure, in view of this phenomenon of premature failure, the failure mode of the roller is analyzed by using the fault tree, and the failure causes and potential hazards in the supporting structure are found out, so as to increase the reliability and safety of the operation of the conveyor system.
1. Fault tree analysis
Fault Tree Analysis (FTA) is a rapidly developing system reliability analysis method, which describes the causal relationship of accidents using logical methods, which can be regarded as a kind of directional "tree", which subdivides the causes of system failures from the whole to the part according to the tree, reflecting the novel analysis method of the system, that is, around the specific system failure, gradually analyzed, and vividly expressed under the fault tree graphic. Find the intrinsic relationship between the system failure and the factors that caused the failure, and optimize the various options to avoid the system failure. The method is visual, clear and logical, and it can identify and evaluate various systems, which is suitable for both qualitative and quantitative analysis.
The fault tree analysis method is one of the most widely used methods in fault diagnosis, and it is also a safe and reliable analysis method, and the FTA analysis method has the following advantages and disadvantages. (1) By analyzing the causal relationship of the accident, the potential risk factors inherent in the system are found out, which provides a basis for safety design and reasonable planning
(1) It vividly represents the causal relationship and logical relationship between the accident and the cause,
(2) In accident analysis, the overhead event can be an accident that has occurred. Through analysis, we can find out the causes, take measures and control them, so as to predict and prevent failures.
(3) It can be used for qualitative analysis to find out the impact of risk factors on accidents; It can also be used to quantitatively analyze the probability of an accident from the probability of each failure factor.
(4) The workload of complex system fault tree analysis and calculation is relatively large.
