Material q235b or q345b(similar as fe37 or fe52) End girder is welded with rectangular tubes or good steel. Main girders connected with bolts Trinity-drive system or traditional drive by motor and reducer Assembly and adjustment is rapid, simple Compact structure, small and light Special wheel, light , widely used Smoothly moving, effectively braking, long service life Choosing according to different needs 7.5-25.5 span
