Code plate for positioning and detecting heating plate, code plate assembly and code reader

The invention provides a code plate for positioning detection of a heating plate, a code plate assembly and a code reader, a plurality of detection areas are arranged in the left side area of the code plate, and detection through holes are formed in the corresponding detection areas according to code plate identification and coding requirements; the code plate assembly comprises a plurality of code plates for positioning and detecting the heating plate, and hole combinations of detection through holes in the code plates are different; the code reader comprises a code plate assembly, a supporting frame, a controller, an upper positioning detection set and a lower positioning detection set, each of the upper positioning detection set and the lower positioning detection set comprises a plurality of sets of correlation photoelectric switches, the upper positioning detection set and the lower positioning detection set are oppositely arranged on the supporting frame up and down, and the correlation photoelectric sw