Assistant positioning device for combined welding of side beam of chassis of urban rail coach

The invention provides an assistant positioning device for combined welding of a side beam of a chassis of an urban rail coach, and belongs to the field of assistant positioning equipment for integral welding of the side beam of the chassis of the urban rail coach. The device comprises a plurality of double-side-beam positioning T-shaped platforms (3), a plurality of overturning driving mechanisms (4), a plurality of connecting plate clamping rotating arms (5) and a steel pipe rotating shaft (6), wherein each double-side-beam positioning T-shaped platform (3) comprises a T-shaped platform body (3-1), two transverse lead screw propping heads (3-2), a longitudinal compressing stud (3-3), a door-shaped compressing rod (3-4), a central positioning stopping block (3-5) and a locking nut (3-6). According to the device, two side beams of the chassis are synchronously fixed through the two-side-beam positioning T-shaped platforms; in addition, a plurality of L-shaped connecting plates and the two side beams of the chassis are synchronously matched to position and reliably fixed through the pneumatic overturning driving mechanisms and the plurality of connecting plate clamping rotating arms; therefore, the production efficiency of the welding operation can be greatly increased; in additional, the assembling is convenient and quick; the clamping thickness can be flexibly adjusted; the generality is high.