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• W5134699 abstract "The results of a series of research studies since 1984 at The University of Queensland intondragline bucket performance identified the potential benefits of a new bucket geometry.nOriginal performance testing of the new bucket geometry (UQ1 bucket) produced a thirty perncent reduction in filling times with the application of twenty per cent less energy whenncompared to conventional bucket performance. Although the results of the testing werenencouraging, it was identified that there were possible problems with the scaling of thenbuckets. In particular, the weight of the scale buckets was found to be incorrect. A programnof testing was developed to resolve the question of scale modelling with regard to soil-machine interaction and to further develop the UQ 1 bucket design.nn n The testing program was broken into three distinct stages with the first of these involvingninvestigation into the scale modelling theory applicable to dragline bucket scale performance.nThrough the use simplified digging implements such as single teeth and backless buckets, thencritical factors with regard to scale modelling were isolated and quantified. The mostnimportant finding of this stage of the investigation was the fact that a consistant scale factor ofnthree was applicable for all materials provided that they were in an air dried condition. Thisnallowed all future testing to be undertaken at a scale factor of three due to the air dried naturenof all materials.n n The second stage of the test program involved confirmation of the original test results andnfurther development of the UQ 1 bucket design. The existing buckets were modified to reflectnthe correct scaling strategy and the series of tests conducted by Rowlands (1991) repeated.nResults indicated that the UQ 1 bucket did in fact fill faster and use less energy than thenstandard bucket design. However, the difference was not as great as was found in the originalntest program. Further investigation into the bucket length to width ratio was accomplishednthrough the use of false backs in the existing buckets. These results, in the quantitative sense,nwere inconclusive, but qualitatively provided an indication that a bucket between the twonexisting designs would provide better results. Why the false back tests failed to providenquantitative results is not known.n n Stage three of the test program involved construction of the third bucket and subsequentntesting in a variety of materials. Materials included the two original materials and fournoverburden materials from operating open cut coal mines in Central Queensland. Resultsndemonstrated that the material properties play a large role in determining the performance ofnthe dragline bucket however, the bucket design is still the most important factor. Resultsnobtained indicate that the new (UQ2) bucket is as good or better than the UQ1 bucketndeveloped by Rowlands (1991) in the original test work.nn n Further test work is required to identify the optimum bucket shape and even more extensiventesting is required to determine the optimum design and set up of the dragline bucket for eachnmaterial to be excavated. Scale model test work can play a large part in both of thesenprocesses due to the relatively inexpensive nature of the test work.n" @default.
• W5134699 created "2016-06-24" @default.
• W5134699 creator A5088241512 @default.
• W5134699 date "1996-01-01" @default.
• W5134699 modified "2023-09-27" @default.
• W5134699 title "Efficient dragline bucket design" @default.
• W5134699 hasPublicationYear "1996" @default.
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