Bottom supporting plate structure based on raft installation

The bottom supporting plate structure based on raft installation comprises an L-shaped plate, a sliding groove is formed in the bottom of the L-shaped plate, a two-way threaded rod is movably connected in the sliding groove, two bottom plates are movably connected in the sliding groove, the two-way threaded rod penetrates through the bottom plates and is movably connected with the bottom plates, two sliding openings are formed in the upper surfaces of the bottom plates, and the two sliding openings are communicated with the two sliding grooves. A sliding opening is formed in the base, a sliding frame is movably connected into the sliding opening, a second wedge-shaped block is movably connected into the sliding frame, two positioning columns are fixedly connected into the sliding frame and penetrate through the second wedge-shaped block, and second springs are movably connected to the circumferential outer walls of the positioning columns. According to the steel bar coiling and binding device, the phenomenon