Vented type stopper with temperature measuring function

Abstract

The invention discloses a vented type stopper with a temperature measuring function, and belongs to the technical field of metallurgy continuous casting. The stopper comprises a rod body, a rod head,a temperature measuring unit, a connecting pipe and an exhaust channel; the rod body is of a hollow structure, the upper end of the rod body is connected with the connecting pipe and the lower end ofthe rod body is connected with the rod head; the temperature measuring unit is used for measuring the temperature of molten steel, the opening end of the temperature measuring unit is connected with the rod head and is communicated with an inner cavity of the rod body, and the closed end of the temperature measuring unit extends to be exposed out of the lower end of the rod head; and the inlet endof the exhaust channel is communicated with the inner cavity of the rod body or an inner cavity of the rod head, and the outlet end of the exhaust channel is connected with the outer surface of the rod head and is communicated with the outside. The stopper is used in the continuous casting process, and the temperature measuring unit and the exhaust channel are designed so that the temperature ofthe molten steel near an upper nozzle at the outlet of a continuous casting tundish can be rapidly measured; and meanwhile, with the design of the exhaust passage, the argon blowing can be carried outto prevent the blockage of the upper nozzle and remove slag inclusions in molten steel, and the functions of discharging the flue gas inside the inner cavity of the stopper and cleaning a temperaturemeasuring optical path are equipped.

Description

technical field [0001] The invention relates to the technical field of metallurgical continuous casting, in particular to a breathable stopper rod with a temperature measuring function. Background technique [0002] Continuous casting is a key process in steel production, which converts molten steel into billets. Flow control and temperature measurement have always been two key issues in continuous casting production. [0003] The molten steel flows out of the continuous casting tundish and enters the continuous casting crystallizer through the upper nozzle and begins to solidify. The temperature of the molten steel at the outlet of the tundish is the most instructive temperature for the superheat and solidification quality control of the molten steel in the entire tundish. [0004] The liquid level of molten steel in the mold is a key parameter affecting the quality of the slab, which is controlled by the flow of molten steel flowing out of the tundish. The molten steel f...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of temperature measurement, researchers in Chinese patents CN1936524A and CN101337273A put thermocouples or infrared temperature measuring probes into airtight stopper rods to realize temperature measurement. There are two problems in this technical solution: one is that the rod of the stopper rod The head is made of a thick-walled structure for anti-scouring, resulting in a serious lag in the temperature measurement response, which is difficult to meet the process control requirements; second, this technical solution can only be used for stoppers without air holes. When there are air holes, the rod head will Cooling due to blowing argon, unable to measure molten steel temperature

[0007] In summary, the existing technical solutions are difficult to solve the problems of temperature measurement at the outlet of the continuous casting tundish, anti-clogging at the upper nozzle and removal of slag inclusions while controlling the flow

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