Analysis Of 30 MN Powered Support Tester's Structure

Powered support for coal mines is an important protection equipment with emulsion as its working medium. Test bed is for the assessment of the powered support for coal mines. In the past, traditional design methods were used to design such kind of test beds,the most disadvantages of traditional design methods are that:working loads were huge,lead time of development was too long, the safety factors were too big ,the test beds could not be designed as a whole .and the weight of the test beds was too heavy. So, it is necessary to make use of moden design methods.This research proposes a test bed of three-beam and four-column powered support with an oblique stand, after having studied the criteria as specified in the two documents: GB25974.1-2010 Powered Support for Coal Mine-Part 1: General Specification and MT312-2000 General Specification for Powered Support. The main parameters of the test bed are: testing resistance: 30000kN, surface of the working table: 8500mm×3600mm, and height range: 1500mm - 7500mm. The study conducts a three-dimensional geometric modelling for the test bed by means of Pro-E software. Then by using the software of ANSYS an analytical calculation is carried out on the overall structural strength and fatigue life of the model. Afterwards, the structure of the test bed is improved accordingly. In the end, the design plan is assessed.By finite element analysis, it is found out that on the condition of ultimate load the biggest stress of main structure is 400MPa while the safety factor is 1.15 and on the conditoin of nominal load the safety factor is greater than 1.5. The fatigue life of the main body of the test bed (namely the times of the loading cycles of the test bed) is greater than 1×10 20.On the condition of 31500kN, the maximum degree of deformation of the skeleton structure of the test bed is 3.1mm which is roughly in conformity with the result of calculation.The innovation of this test bed structure is that it has a whole assembly structure resembling a building block, and that the pin connections facilitate processing of parts, installation and transportation, and that the oblique form of support to overcome the horizontal force reduces the horizontal displacement of the equipment.This test bed has currently the largest carrying capacity among same kind of test beds in China.The weight of the test bed becomes 505T, the weight has been reduced by 30% as a result of study on this project compared with same kind of test beds. Therefore it is hoped that this project will be able to serve as a useful guidance for future similar test bed designs.