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This paper takes the 1500t mobile moulded frame trench making machine as the research object, firstly introduces the structural composition and operation flow of the trench making machine, and establishes the finite element model of the trench making machine by using the parameterized language of APDL in ANSYS software. Since the main beam has a large self-weight and is the main load-bearing part of the machine, the analysis focuses on the stress and displacement maps of the main beam under the typical working conditions of pouring and over-hole. Through the finite element analysis, the maximum stress value of the main beam is 179.78MPa, which occurs in the middle position of the main beam under the concrete pouring condition of Class 8 wind. The maximum deformation in the Y direction of the main beam was -69.90 mm, which occurred at the two end positions of the main beam. In addition, the results of class 11 wind unloaded and different distance working conditions over the hole were also obtained, and found to meet the use requirements. The safety of the main girder design is verified by comparing the theoretical calculations with the finite element calculations, and at the same time, the theoretical basis is provided for the subsequent research on whether there is any optimisation space for the main girder.
Wu et al. (Mon,) studied this question.