Hinge

The hinge comprises a bottom rod, a connecting rod assembly, a limiting connecting rod and a sash fixing piece, the bottom rod is used for being fixedly connected with a window frame, the sash fixing piece is used for being fixedly connected with a window sash, and the connecting rod assembly comprises a first connecting rod, a second connecting rod and a third connecting rod. One end of the first connecting rod is hinged to one end of the bottom rod, the other end of the first connecting rod is hinged to one end of the second connecting rod, and the other end of the second connecting rod is hinged to the middle of the sash fixing piece. A limiting screw is further arranged on the bottom rod, upward or downward adjustment is conducted through the limiting screw so that the limiting connecting rod can be limited, and angle adjustment of the hinge is achieved. Through the structural design, the multi-angle limiting adjustment function can be achieved, the structure is simple and compact, universality is high, a