Assembly device and method for marine engine frame single piece

The invention discloses an assembling device and method for a marine engine rack single piece, solves the problem that in the prior art, after welding of the marine engine rack single piece, deformation is large, and has the beneficial effect that the double faces of the rack single piece can be welded at the same time. According to the specific scheme, the assembly device for the marine engine rack single piece comprises a supporting frame, the supporting frame has the set height, the supporting frame is provided with a concave part, the concave part is arranged in the height direction of the supporting frame so that a wing plate on the single side of a first component can be inserted into the concave part, and the first component is composed of two segmented parts of the rack single piece; the length of the concave part is larger than that of the wing plate, the depth of the concave part is larger than or equal to the maximum width of the wing plate, the width of the concave part is larger than that of the