Length-adjustable immersed thermocouple

The utility model discloses a length-adjustable immersed thermocouple, which comprises a mounting seat, a measuring end is arranged above the mounting seat, the lower part of the mounting seat is fixedly connected with a connecting pipe, the outer side of the connecting pipe is sleeved with an outer pipe, the inner upper end of the outer pipe is provided with a limiting block, the connecting pipe is sleeved with a spring between the limiting block and a pressing rod, and the spring is connected with the connecting pipe. The upper portion of the spring is fixedly connected with the limiting block, and the lower portion of the spring is fixedly connected with the pressing rod. According to the length-adjustable immersed thermocouple, the pressing rod drives the connecting pipe to advance forwards, so that the overall length of the thermocouple is increased, the thermoelectric stage measures the temperature of molten iron, and data detected by the thermoelectric stage can be transmitted through the wire, so that