Method for reliability assessment of large mining excavator lifting mechanism

An excavator and reliability technology, which is applied in the field of reliability evaluation of the hoisting mechanism of large mining excavators, can solve the problem of not objectively reflecting the reliability of hoisting mechanisms of large mining excavators, and obtaining a large number of on-site inspections of hoisting mechanisms of large mining excavators and test data difficulties, time-consuming and other issues

Inactive Publication Date: 2014-04-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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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
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  • Method for reliability assessment of large mining excavator lifting mechanism
  • Method for reliability assessment of large mining excavator lifting mechanism
  • Method for reliability assessment of large mining excavator lifting mechanism

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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0038] The method for evaluating the reliability of the hoisting mechanism of a large mining excavator in this embodiment is as follows: figure 1 As shown, it mainly includes the following steps:

[0039] S1. Collect fault interval time samples of the hoisting mechanism of a large mining excavator, and set the collected N fault interval time as t i ,i=1,2...N;

[0040] S2. Calculate the first four moments of the N fault interval time samples according to formula (1):

[0041] m j = Σ i ...

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Abstract

The invention discloses a method for reliability assessment of a large mining excavator lifting mechanism. The method mainly comprises the steps of collecting fault interval time data; calculating first four moments of obtained samples; determining an integral interval and calculating a maximum entropy density function; determining prior distribution and posterior distribution; and calculating mean time between failures and reliability. The method for reliability assessment of the large mining excavator lifting mechanism is based on the Bayes principle and the maximum entropy density principle, a small amount of obtained samples can be effectively applied to estimate a probability density function, the large mining excavator lifting mechanism reliability assessment having small sample characteristics is achieved, and the method for reliability assessment of the large mining excavator lifting mechanism is simultaneously also suitable for reliability assessment of mechanical products for which plenty of samples cannot be obtained easily.

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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Application Information

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IPC IPC(8): G06F19/00
Inventor 肖宁聪李彦锋杨圆鉴米金华黄洪钟张小玲刘宇
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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