Telescopic boom crane reliability design of a number of issues
Normal range of 22 to take time and other requirements in the literature [3] Richard. Strength calculation four kinds of] two conditions as follows: condition one, the basic arm, variable fuel tank cap bearing hinge point section. PQ = 25t, = 40. . A 8.4m; conditions. Of the two arms, two arms with a sudden change in the basic arm overlap at the cross-section, P0-1G. Gt, a G0. , F = 13.9m; condition three, the three-arm, three-arm with two arms overlap at the sudden change in cross-section, P0 = 10.3t. = 70. . = 19.4m {condition four, the four arms, four arms and three arms overlap at the sudden change in cross-section, P. A G. It, = 7,5. . = 24.9m. Set up the weight from the weight of the standard deviation of 2% of the length dimension of the mean, standard deviation depending on the tolerance of the south formula: the reliability of child 2 hanging ■ l (iv) design of the block diagram and a half: ± I6J where ~ is the size of maximum, a minimum value for the size. Boom material still choose 16Mn, the yield limit by the mean and standard deviation [5] Richard is 41.8kgf/mm,
tory burch outlet, 2.09kgf/mm. , Elastic modulus mean = 2.1 × 10kgf/mm. , Standard deviation = 320kgf/mm, these data entry procedures, the reliability of the crane design results obtained in Table 23.4. Table 1 shows the reliability of the design before the size. 5 results and conclusions of 5.1 applied reliability design method for reliability 25t crane telescopic boom design,
abercrombie ireland, not only from the crane's reliability increased to 0.99732 0.84376, and weight reduction of nearly 5% , indicating the reliability of the design of safe and reliable, the advantages of saving the economy. 5.2 The results from the table to see the original design three or four conditions of the reliability of large, and one or two conditions of reliability, but smaller, that is three or four arm design was conservative, a, two-arm small safety margin,
tory burch outlet, in actual use failure-prone. The use of reliable design, the first and second conditions to improve the reliability, that is, two-arm machine obscene 125t t hanging from heaven before the reliability design Dimensions; Illlll boom serial number b ‰ Gong l6354308.08.06. 025533868.08.0I. S34832876.08.0 so out of the boom is more rational design of Table 225t t machine hanging from heaven reliability design dimensions (ram) b to boom serial number? to 1635540808.06.025534408.08.0I.534403104.58.0I.0I35 02654 .06.04.0 Table 325t t machine hanging from the design before and after weight compared Xiao reliability reliability reliability reliability design design design boom serial number before the weight (kg) after Weight (kg) after weight lll55.4l2l1.42929 .4965.73606.8552.44480.8363.9 Total 3224.93063.II.98 Table 425t t machine hanging from Xiao reliability design strength after the reliability of the overall design approach compared the stability of the crane condition a rigidity condition two condition three conditions four original design 0.98930.843760.884-930.93980.9. 690 ~ l0.84376 by checking the value of the reliability degree of reliability design does 0.9tz7400.997320.997320, 99807O99819 ~ 1099732 set Note the table as the value of 0.9 '398, said after the decimal point 4 + 9,
tory burch outlet, that is 0.9999398 remaining similar.
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