Straightness detection device for copper bar

The utility model discloses a straightness detection device for a copper bar, comprising an equipment main body, the surface of the equipment main body is provided with a detection cavity, the left and right inner walls of the detection cavity are respectively provided with a servo motor, a bidirectional lead screw and a limiting slide bar, the outer surface of the limiting slide bar is slidably connected with two straight modules, and the straight modules are in threaded connection with the bidirectional lead screw. A plurality of lamp grooves are formed in the inner bottom of the detection cavity, infrared lamps are arranged in the lamp grooves, a transparent observation plate is fixedly connected to the upper surface of the equipment body, and a thermosensitive ink layer is arranged on the lower surface of the transparent observation plate. A copper rod is placed between the two straight modules, then the servo motor is used for driving the bidirectional lead screw to rotate, the two straight modules are m