The inspection robot for thin coal seam can replace workers to make the daily inspection in fully mechanized mining surface. Based on the narrow and poor environment of thin coal seam, we designed a joint swing arm inspection robot, which is able to adapt to the unstructured terrain in a thin coal seam. The structure of the moving mechanism of the inspection robot has been designed. It can be realized that there are two DOF for moving on a single drive central axis through design of the shaft inside and shaft sleeve outside. The strength check and the modal analysis of the key parts of the moving mechanism such as the hollow shaft sleeve and the drive shaft, are made by Ansys Workbench. According to the analysis results, the maximum stress caused by internal load and external impact load is far less than the yield strength of the material. The modal shape diagram shows that, when the meshing frequency and the external excitation frequency are much less than the first-order natural frequency of the parts, there will be no resonance and noise. The analysis results show that the design is reasonable and reliable.
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