Device and method for judging ring crack of blast furnace carbon brick

The invention relates to a blast furnace carbon brick ring crack determination apparatus, which comprises: a box body, which is internally provided with a fireproof coating and is suitable for placing a carbon brick; the temperature measuring end of the first temperature measuring thermocouple penetrates through the box body and is inserted into the cold surface of the carbon brick; the temperature measuring end of the second temperature measuring thermocouple penetrates through the box body and is inserted into the hot surface of the carbon brick; the flame spray gun is inserted into the box body from the side surface of the box body and is used for heating the hot surface of the carbon brick; the oxygen tank is connected with the flame spray gun and is used for introducing oxygen into the box body; collecting values of the first temperature measuring thermocouple and the second temperature measuring thermocouple in a plurality of temperature sections so as to obtain the heat flow intensity of the second car