Keywords: automatic control, heat treatment, temperature, industrial electric furnace, electric furnace, industrial furnace, oven, furnace wire,

a brief analysis of the common adjustment rules for automatic control of heat treatment temperature of industrial electric furnaces

　　the temperature control of industrial electric furnaces and ovens is very important for heat treatment. excellent quality electric furnace wires and effective control make the furnace temperature stable with a given temperature range to meet the needs of heat treatment process. Automatic control of furnace temperature --- refers to automatically turning on or off the heat source energy supplied to the furnace according to the deviation of the furnace temperature to a given temperature, or continuously changing the size of the heat source energy.
　　heat treatment temperature automatic control commonly used regulation rules include two-bit, three-bit, proportional, proportional integral and proportional integral differential.
　　1) two-position adjustment-it has only two states of opening and closing. when the furnace temperature is lower than the given value, the actuator is fully opened; When the furnace temperature is higher than the given value, the actuator is fully closed. (actuators generally use contactors)
　　2) three-position adjustment-it has two given values of upper and lower limits. when the furnace temperature is lower than the lower limit, the receiver is fully opened. When the furnace temperature is between the upper and lower limit given values, the actuator is partially opened. When the furnace temperature exceeds the upper limit given value, the actuator is fully closed. (if the tubular heater is a heating element, three-position adjustment can be used to realize the difference between heating and heat preservation power)
　　3) proportional adjustment (p adjustment)-the output signal (m) of the regulator is proportional to the deviation input (e). That is: M = ke & nbsp; Where: k-proportional coefficient
There is a-corresponding proportional relationship between the input and output of the proportional regulator at any time. Therefore, when the furnace temperature change reaches equilibrium through proportional adjustment, the deviation when the furnace temperature cannot be added to the given value-called & ldquo; Static difference & rdquo;
　　4) proportional integral (PI) adjustment-for & ldquo; Static difference & rdquo;, add integral (I) adjustment integral to proportional adjustment, adjustment means that the output signal and deviation of the regulator increase with the increase of time, and there is no output signal until the deviation is eliminated, so it can eliminate & ldquo; static difference & rdquo; The combination of proportional adjustment and integral adjustment is called proportional integral adjustment.
　　5) proportional integral differential (PID) adjustment-proportional integral adjustment will increase the adjustment process and the fluctuation amplitude of temperature. therefore, differential (d) adjustment is introduced. Differential regulation means that the output of the regulator is proportional to the differential of deviation to time. The differential regulator has an adjustment signal output when the temperature changes. The faster the change speed, the stronger the output signal, so it can speed up the adjustment speed and reduce the temperature fluctuation amplitude. The combination of proportional regulation, integral regulation and differential regulation is called proportional integral differential regulation. (Generally use thyristor regulator as actuator)

More Brief Analysis of Common Regulating Law for Automatic Control of Heat Treatment Temperature in Industrial Electric Furnace: www.quenchtank.com/view-104.html