Coal mining machine walking box assembly and combined type coal mining machine walking box series

The invention relates to a coal mining machine walking box assembly and a combined coal mining machine walking box series, the coal mining machine walking box assembly comprises an upper shell, a lower shell and a transition frame, the upper shell and the lower shell are each of a box body structure with an inner cavity penetrating up and down, and a pair of shaft assembly mounting holes and a pair of two-shaft assembly mounting holes are formed in the front side wall and the rear side wall of the upper shell; the front side wall and the rear side wall of the lower shell are only provided with a pair of shaft assembly mounting holes or a pair of shaft assembly mounting holes and a pair of two-shaft assembly mounting holes; the coal mining machine walking box comprises a coal mining machine walking box with a high gear, a middle gear and a low gear; the coal mining machine walking box with the low gear height only adopts an upper shell, the coal mining machine walking box with the middle gear height and the hi