Stepped overlapping core structure

The invention relates to a stepped overlapping core structure, and belongs to the technical field of transformer equipment. According to the technical scheme, the structure includes: a pull plate (2),pull plate insulation (3), core columns (4), iron yokes (5), a clamp piece (6), a core oil channel (8) and an iron yoke oil channel (9), and the three core columns (4) are arranged in parallel, the two ends of the three core columns (4) are respectively provided with one iron yoke (5), the iron yokes (5) and the core columns (4) are fixed together through the clamp piece (6) and the pull plate (2), and the pull plate insulation (3) is arranged between the pull plate (2) and the core columns (4), The core columns (4) are cylindrical structure laminated multiple stages of laminated sheets , anda core oil channel (8) is arranged between the laminated sheets, the iron yokes (5) are the cross square structure formed by the two stages of laminated sheets, and the iron yoke oil channel (9) is arranged between the lamina