Portable device for detecting grain size of aluminum plate strip

The invention relates to the technical field of grain size detection, in particular to a portable device for detecting the grain size of an aluminum plate strip. The portable device is characterized by comprising a cleaning bottle, an acid bottle, a cleaning head and a pickling head; the cleaning bottle with two open ends sleeves the acid bottle, a gap is formed between the outer wall of the acidbottle and the inner wall of the cleaning bottle, and the bottom of the acid bottle is not in contact with the corresponding open end of the cleaning bottle; the pickling head for smearing acid is arranged at one opening of the acid bottle, and is provided with an acid liquid channel through which the smearing surface of pickling head is communicated with an inner cavity of the acid bottle, and the outer wall of the pickling head is correspondingly and movably connected with the inner wall of the open end of the cleaning bottle in a sealed mode; and a cleaning head for smearing water is movably connected to the open e