The trolley type annealing furnace is usually used to produce high-quality household electrical appliances automobile boards. It usually includes the following furnace sections: jet preheating section (JPF), radiant tube heating section (RTF), soaking section (SF). The trolley type annealing furnace uses three-stage waste heat to recover combustion air, uses two-stage waste heat recovery. In the front tropical steel, the third stage of waste heat recovery produces superheated water), push-pull combustion system its supporting on / off combustion control system, furnace composite lining other advanced energy-saving technologies.
The steel structure of car type annealing furnace mainly includes furnace shell support frame driving equipment support frame (platform steel structure). Considering the potential thermal expansion contraction of the shell, each part of the shell support frame platform steel structure is independent of each other. Firstly, the bottom roll chamber of each furnace section is installed in place, the four reference columns are welded on the basis of its four corner pillars; the left right integrated end plates are welded together. The operation side drive side are respectively made of several independently manufactured side plates, welded installed bottom to top, then the top roller chamber is installed. The top roller chamber also has four datum pillars, which are positioned welded together. The shell of car type annealing furnace is manufactured installed the quasi life column of furnace body 4. Several widened platforms are installed on the drive side to store the furnace top, in principle!
According to the working principle of slow cooling section, the initial analysis is that the inconsistent thermal expansion will lead to channel steel cracking. The negative pressure produced by the circulating cooling suction effect of the circulating fan will bring the correct gas into the furnace, so that the oxygen content in this part is incomplete. If the steel grade specification e7j is changed, the furnace condition will be stable; once the steel grade specification temperature change frequently, the crack will further deteriorate, the furnace condition is difficult to maintain stability.
When the steel grades are switched, the temperature difference between the inlet outlet air of the slow cooling part of the hot dip galvanizing device is usually about 200K. Considering the gap between the cooling air box the furnace shell, the temperature circulating gas will conduct heat exchange in this gap; the f f channel steel on the air duct frame are welded with the steel structure of the furnace shell. The temperature difference between the ambient air outside the furnace the high temperature gas in the furnace will produce a thermal gradient on the corresponding channel steel. , due to the expansion stiffness of stainless steel, it is difficult to meet the requirements of temperature difference deformation of air duct, will cause channel steel cracking.
Address: Changxing Yongcheng Industrial Furnace Co., Ltd., Qiaonan Industrial Zone, Lincheng Town, Changxing County, Huzhou City, Zhejiang Province