Liquid nitrogen ultra-fast cooling device for hot rolled strip

Abstract

The invention relates to a hot rolled sheet strip liquid nitrogen ultrafast cooling device. The hot rolled sheet strip liquid nitrogen ultrafast cooling device comprises thermo detectors, a controllerand a plurality of cooling sections connected between a finishing mill and a winding machine in series; the thermo detectors are located before an outlet of the finishing mill and the winding machine; each cooling section comprises an upper controlled cooling device and a lower controlled cooling device which are arranged on the two sides of a sheet strip, and the upper controlled cooling deviceand the lower controlled cooling device each comprise a controlled cooling transverse beam guide rail, a guide rail type supporting frame, slice nozzle assemblies, pressure nozzles, a displacement cylinder, a liquid nitrogen container, an infrared temperature measurement device and solenoid valves; the guide rail type supporting frames are slidably connected with the controlled cooling transversebeam guide rails and pushed by the displacement cylinders to move in the rolling direction; the multiple slice nozzle assemblies are fixed to the guide rail type supporting frames in the rolling direction, a plurality of pressure nozzles are fixed to the slice nozzle assemblies, inclined angles are formed between the nozzles and the rolling direction of the sheet strip, and the nozzles are connected with the liquid nitrogen containers through powder heat insulated pipes; the solenoid valves are arranged on the pressure nozzles and connected with the controller; and the two ends of the coolingsections are provided with the infrared temperature measurement devices.

Description

technical field [0001] The invention belongs to the technical field of automatic measurement and control of rolling equipment, and in particular relates to a liquid nitrogen ultra-fast cooling device for hot-rolled strips. Background technique [0002] With the acceleration of the industrialization process and the continuous subdivision of the deep processing industry, various fields such as aviation, aerospace, navigation, chemical industry, bridges, automobiles, construction, etc. have more specific requirements for performance indicators such as hardness, strength, fracture, toughness, and elongation of the strip. and specialization. For hot-rolled strips, the temperature not only affects the three-dimensional deformation law of the entire rolling process, but also in the long-distance cooling stage after rolling, different cooling rates or cooling control methods will directly affect the metallographic structure and shape of the final strip. Therefore, controlled coolin...

AI Technical Summary

Problems solved by technology

However, during the use of liquid nitrogen, it is very difficult to control its flow rate, pressure, temperature and gas-liquid phase. In addition, if the equipment or parts are large or irregular, the application of liquid nitrogen in a large area will bring great potential safety hazards, which largely limits the application field and process development process of liquid nitrogen

In the field of traditional heavy-duty machining, the application of liquid nitrogen is still rare, and there is also a lack of efficient and controllable liquid nitrogen cooling equipment and corresponding theoretical and technical research.

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