Reliability Analysis Of Rapier Loom Weft Insertion System

< p > experts have used the reliability analysis technology to measure and analyze the G1724 series < a href= "http://www.91se91.com/news/" > rapier loom < /a >. According to a large amount of data, the G1724 series rapier looms have been improved by stratification and sub emphasis from the aspects of design, technology and assembly, and their reliability has been greatly improved in a short time.

By making scientific failure modes and data, early fault detection and reliability test were carried out.

Statistics of the collected data, finding out the weak links, analyzing the influence of the failure modes (hazards), and establishing effective countermeasures for improving the reliability.

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< p > 1 early fault detection and reliability test, < /p >

< p > in our early troubleshooting and reliability test, the number of samples was 18, the total time was 11500h, and the statistics of fault classification, in which the number of faults in the weft insertion system accounted for 51.7% of the total number of failures. From the fault statistics, we can see that the main failure of rapier looms is in the weft insertion system, so we emphatically introduce the failure mode influence (hazard) analysis of the weft insertion system (FME (C) A).

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Failure mode influence (hazard degree) analysis of weft insertion system of < p > 2 G1724 rapier loom < /p >

< p > FME (C) A is a kind of reliability analysis technology, which can be adopted in the stages of product design, development, manufacture and application.

We apply this method to fault analysis in the early stage of looms, and make quantitative analysis of the failure modes that have a significant impact on the performance of the products, and propose improvement measures for the identified problems to eliminate or reduce those potential defects.

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< p > 2.1 the functional block diagram and reliability block diagram of the drawing system < /p >

The main function of the weft insertion system of the "P > G1724 rapier loom is to change the rotational motion of the spindle into a straight line motion suitable for weft movement by means of conjugated cam and connecting rod, gear, and belt pulley.

< a href= "http://www.91se91.com" > weft < /a > weft tension is controlled by the weft accumulator, weft filling is provided to the corresponding weft, and weft filling and weft insertion are carried out.

It is easy to weave the weft yarn by using the edge and edge device.

Cut the waste weft by scissors, so that the edges can form a certain size of burrs.

In the whole weft insertion system, every part of the problem will affect the normal operation of the system, so the system is a series system.

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< p > 2.2 failure mode < /p >

< p > determine the failure mode of each part, and determine the impact of each failure mode, including the final impact on the system, determine the cause of each failure mode, and propose improvement measures.

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< p > 2.3 probability of failure < /p >.

< p > the probability of occurrence of each failure mode is determined by frequency Nf. In the criterion of the probability of occurrence, "L" indicates that the probability of occurrence of a failure mode is very small, while "10" means that the probability is very large.

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< p > 2.4, the severity of the fault is < /p >.

< p > determine the severity of each failure mode, expressed in Ne.

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< p > 2.5 the fault is found to be less than /p.

< p > to determine the degree of difficulty in finding each failure mode is not easy to measure Na.

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< p > 2.6 calculates the number of risk orders for each failure mode RPN < /p >

< p > the product of the frequency, the severity of failure and the score that is not easy to measure is called the risk order number RPN.

RPN gives the relative order of the importance of various failure modes. The larger the RPN, the more dangerous the consequences of this fault.

Therefore, according to the risk sequence number of various failure modes, we can find out the key and weak links that affect the reliability of products.

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< p > 3 reliability growth test < /p >

< p > for the data analysis of the G1724 rapier loom, we have improved and perfected it, and carried out the reliability growth test.

In the reliability growth test, the number of samples was 18, the total working time was 3117h, the time of test ending was 3000h, and the average MTBF was 3 times higher than that of the test.

In this experiment, we made a detailed analysis of the faults of the 18 cars. We analyzed the data again by using FME (C) A, and improved the failure mode of the risk data, which further improved the reliability of the G1724 loom.

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< p > 4, conclusion < /p >

< p > fault mode effect (hazard) analysis FME (C) A is the most widely used and effective reliability analysis technology in the current work. It can be used to find out the possible failure modes of a product system in the design, manufacturing process or quality control.

This technology is used to analyze the < a href= "http://www.91se91.com/news/index_c.asp" > weft insertion system < /a > of G1724 rapier loom, which provides a scientific basis for improving the structure and installation accuracy of the shuttle system in the weft insertion system.

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