Thermal treatment air cooling temperature measuring system for large steel casting

Abstract

The invention provides a thermal treatment air cooling temperature measuring system for a large steel casting, belongs to the temperature measuring devices, and is particularly suitable for measuring the thermal treatment air cooling temperature of the large steel casting. The system structurally comprises a temperature measuring support which is arranged on a movable trolley, an adjusting supporting seat is mounted on the temperature measuring support, and a temperature measuring device is mounted on the adjusting supporting seat; a control cabinet in which a PLC is arranged is mounted in the middle part of the movable trolley; an analog quantity module and a power supply module are connected to the PLC; the power supply module is connected to a 24v switching power supply through a filter and an isolating transformer; the 24v switching power supply is connected to the temperature measuring device and used for supplying power to the temperature measuring device; a power supply switch is connected to the power supply module; the analog quantity module is connected to the temperature measuring device; and the PLC is connected to a thermal treatment furnace control system through a wireless communication module. The system is simple and convenient to operate, and capable of measuring temperature online and in real time, and the temperature data are stored for facilitating analyzing and tracing.

Description

technical field [0001] The invention belongs to a temperature measuring device, and is especially suitable for measuring the air cooling temperature of large steel castings during heat treatment. Background technique [0002] Heat treatment is a metal thermal processing process that heats, heats, and cools metal materials in a certain medium, and controls its performance by changing the metallographic structure of the material surface or inside, including normalizing, annealing, quenching, and tempering. Fire and other crafts. Among them, normalizing is a heat treatment process in which the steel is heated to an appropriate temperature above the critical point Ac3 or Acm and kept for a certain period of time in the air to obtain a pearlite-like structure. The cooling rate must be within a certain range, otherwise it will seriously affect Casting properties, since the castings are directly cooled in the air (with the help of high-pressure fans), it is impossible to use the t...

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Problems solved by technology

Among them, normalizing is a heat treatment process in which the steel is heated to an appropriate temperature above the critical point Ac3 or Acm and then cooled in the air for a certain period of time to obtain a pearlite-like structure. The cooling rate must be guaranteed within a certain range, otherwise it will seriously affect Casting properties, since the castings are directly cooled in the air (with the help of high-pressure fans), it is impossible to use the temperature measurement system on the heat treatment furnace to track and measure. The operator can only carry a hand-held temperature gun to measure the temperature of the casting at regular intervals, and then record it , handed over to craftsmen for evaluation and customer inspection

This is a waste of manpower and cannot guarantee real-time measurement. The most important thing is that the accuracy of the data is difficult to guarantee, which makes it difficult to trace the cause of an accident

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