Reinforced type movable arm transverse beam

The invention provides a reinforced type movable arm transverse beam. The reinforced type movable arm transverse beam comprises an upper cover plate, an upper middle cover plate, a lower cover plate,a left supporting plate and a right supporting plate; weld forming is achieved, and rib plates are welded to the inner side between the upper middle cover plate and the left supporting plate and the inner side between the upper middle cover plate and the right supporting plate. Welding line stress between the middle cover plate and the left supporting plate and between the middle cover plate and the right supporting plate is reduced, the bearing capacity is reinforced, and welding line cracking is reduced. 本发明提供了种加强型动臂横梁，包括上盖板、上中盖板、下盖板、左支撑板、右支撑板拼焊成型，在上中盖板与左支撑板、右支撑板之间内侧加焊了筋板。减少中盖板与左支撑板、右支撑板间的焊缝受力，使该处的承载能力加强，减少了焊缝开裂。