Four-bar linkage locking type manual rebar bending machine for constructional engineering

The utility model discloses a four-bar linkage locking type manual rebar bending machine for constructional engineering, and relates to the technical field of constructional engineering devices. The four-bar linkage locking type manual rebar bending machine comprises a fixed base, an operation table and a locking operation bar; the operation table is fixed to the upper end face of the fixed base, and a rectangular opening is formed in the front portion of the upper end face of the operation table; two locking pressing blocks are symmetrically arranged in the rectangular opening; at least one sliding rail is installed on the upper end face of the fixed base; each sliding rail is perpendicular to the corresponding locking pressing block and is in sliding fit with a sliding way of the corresponding locking pressing block; the locking operation bar is connected with the two free ends of a four-bar linkage device through two sections of reversed threads; a positioning supporting shaft is vertically fixed to the back portion of the upper end face of the operation table; a bending bar is connected to the positioning supporting shaft in a rotatable mode; a bending supporting shaft is vertically fixed to the bending bar; a pressing wheel is in rotating shaft connection with the bending supporting wheel. The four-bar linkage locking type manual rebar bending machine has the advantages that rebars different in thickness specification can be locked for bending operation, and the accuracy of the bending angle and the bending radian is improved.