A Reliability Evaluation Method for Hoisting Mechanism of Large Mining Excavator

Abstract

The invention discloses a method for evaluating the reliability of a hoisting mechanism of a large mining excavator, which mainly includes the steps of: collecting fault interval time data; calculating the first four moments of the obtained samples; determining the integral interval and calculating the maximum entropy density function; determining the prior distribution and posterior distribution; compute mean time between failures and reliability. The method for evaluating the reliability of the hoisting mechanism of a large mining excavator in the present invention is based on the Bayesian principle and the principle of maximum entropy density, can effectively use a small number of samples obtained to estimate the probability density function, and solve the problem of large mining excavation with small sample characteristics. At the same time, the method for evaluating the reliability of the hoisting mechanism of a large mining excavator is also applicable to the reliability analysis of other mechanical products that are difficult to obtain a large number of samples.

Description

technical field [0001] The invention belongs to the technical field of reliability evaluation, and relates to a reliability evaluation method of mechanical products, in particular to a reliability evaluation method of a hoisting mechanism of a large mining excavator. Background technique [0002] Mining excavator is a very important construction machinery, which has been widely used in the field of mine production. In modern engineering operations, mining excavators play a huge role in reducing the labor intensity of operators and improving productivity. However, with the development of science and technology and the improvement of productivity, the demand for energy is also increasing. At present, there are at least 10 large-scale open-pit coal mines with an annual production capacity of 15 million tons to be developed in China. The existing general mining excavators can no longer meet the needs of development, and there is an urgent need to research and produce large-scal...

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Problems solved by technology

The traditional reliability assessment technology is simple in principle, simple in operation and reliable in results, and has been widely used in various fields. Reliability testing with excavators is a very time-consuming and costly work. It is extremely difficult to obtain a large amount of field and test data of the hoisting mechanism of large-scale mining excavators. The "small sample" feature of

Simple use of traditional reliability evaluation methods for reliability analysis often encounters samples that obey several distributions at the same time, such as Weibull and exponential distributions. Therefore, when judging the distribution type of samples, it is inevitable Human subjective factors will be introduced, so that the analysis results cannot objectively reflect the reliability of the lifting mechanism of large mining excavators

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