Molding machines for flexible production of rebars of bottom, web, and top plates of precast small box girders and methods for using thereof

A molding machine for flexible production of a rebar of bottom, web, and top plates of a precast small box girder, including a molding mainframe and a movable gantry welder disposed on an outlet end of the molding mainframe,

• wherein the molding mainframe includes a frame, two synchronous lifters, a vertical movable sliding table, a plurality of upper support plates, and a plurality of comb-like support plates, an inlet end of the frame is provided with a longitudinal bar feeding assembly for guiding a longitudinal bar arranged in a standardized manner, the two synchronous lifters are fixedly mounted on an upper side of an outlet end of the frame, the vertical movable sliding table is connected with the frame through a guide rail sliding block structure in a position-limiting and sliding manner, and an output end of the two synchronous lifters are fixedly connected with the vertical movable sliding table, the plurality of upper support plates are fixedly mounted on the vertical movable sliding table at equal spacing, and the plurality of comb-like support plates are fixedly mounted on a lower side of the outlet end of the frame;
• the upper side and the lower side of the outlet end of the frame are provided with a plurality of spot welding assemblies for welding a portion of cross nodes of hoop bars and longitudinal bars, and the plurality of spot welding assemblies are connected with the vertical movable sliding table and the frame, respectively, and a straightening rebar receiving assembly is mounted on the lower side of the outlet end of the frame, and a straightening rebar feeding assembly is mounted between the straightening rebar receiving assembly and the frame, the portion of cross nodes is alternating cross nodes of the hoop bars and the longitudinal bars, and a left side and a right side of the frame are provided with a bending assembly, respectively;
• two row welding assemblies for welding all cross nodes of the hoop bars and the longitudinal bars are disposed between the molding mainframe and the movable gantry welder, the two row welding assemblies are connected with the plurality of upper support plates and used for welding the longitudinal bars of an upper layer and a lower layer, respectively, and the all cross nodes is all cross nodes of the hoop bars and the longitudinal bars;
• the longitudinal bar feeding assembly includes a plurality of pneumatic clamps, a side guiding plate, and a threading guiding plate;
• two rows of pneumatic clamps of the plurality of pneumatic clamps are fixedly mounted on an upper side and a lower side of the inlet end of the frame, respectively, the two rows of pneumatic clamps are configured to clamp and fix the longitudinal bars of the upper layer and the lower layer that are fed into the longitudinal bar feeding assembly, respectively;
• the threading guiding plate is fixedly mounted on a lower end of the upper support plate, the threading guiding plate is provided with a plurality of through-holes used for positioning the longitudinal bars of the upper layer, and the longitudinal bars of the lower layer are directly supported through the frame;
• and
• the lower side of the inlet end of the frame is fixedly provided with a plurality of groups of side guiding structures for guiding the longitudinal bars of the lower layer, each group of the plurality of groups of the side guiding structures being made of two side guiding plates, an inlet end of the two side guiding plates being provided with an opening that facilitates entry of the longitudinal bars of the lower layer.