A trolley type annealing furnace

Abstract

The invention discloses a trolley type annealing furnace. The trolley type annealing furnace comprises a trolley and a furnace body which is sealed to the trolley by means of its gravity in a tight buckling manner; a motor is arranged on the trolley, and is connected with an axial flow fan through a triangular rubber belt; a workpiece is placed above the axial flow fan; air returning pipes are laid between the workpiece and the trolley sealing face of the trolley in the transverse direction and in the vertical direction; an air tunnel is formed in the center junction position of the air returning pipes which are correspondingly laid in the transverse direction and in the vertical direction; the axial flow fan is arranged in the air tunnel; air blown out of the axial flow fan penetrates the air tunnel and then is blown to the workpiece; below the workpiece, a circle of annular cooling circulating pipe is laid around the workpiece in the furnace body; the cooling circulating pipe is connected with a variable frequency motor outside the furnace body through a pipeline; and the variable frequency motor performs cooling treatment in a hearth by means of compressed air. The trolley type annealing furnace has the beneficial effects of taking investment, running cost and workpiece quality into consideration at the same time, and being simple in structure, efficient and capable of saving energy and reducing the production cost.

Description

technical field [0001] The application belongs to the technical field of special steel heat treatment, and in particular relates to a trolley-type annealing furnace. Background technique [0002] The trolley-type annealing furnace is one of the most widely used heat treatment equipment for metal materials in metallurgy, machining, pressure processing and other processes. The trolley-type annealing furnace is the most widely used annealing furnace in the production of special steel. It can be widely used because only the trolley occupies the workshop area under the crane for a short time, and the furnace body is placed in the attached workshop and driving area, saving Nearly 60% of the annealing process occupies the main workshop investment. Different types of trolley-type annealing furnaces are formed according to regional natural gas supply conditions, production varieties and investment positioning. [0003] At present, in the process of heating the workpiece in the curr...

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Problems solved by technology

[0003] At present, in the process of heating the workpiece in the current annealing furnace, due to the low thermal efficiency of the radiation heat of the resistance heating in the range of 600-900°C, the energy consumption is high; 50°C slowly shrinks to 5-10°C. In addition, due to the shielding effect of the central workpiece, the heating temperature is lower than the heating temperature near the furnace resistance band, resulting in uneven temperature of the workpiece in the furnace; this large gap will lead to When the two parts are heated asynchronously, the holding time of the workpiece through firing is different, which affects the uniformity of the material structure in the furnace;

[0004] Secondly, according to the requirements of the heat treatment process curve of the current trolley-type annealing furnace, when the furnace temperature reaches less than 702°C and then slowly cools down, the cooling speed is too slow, and the production of special Zhu Steel requires high annealing heat treatment capacity, while the current trolley-type annealing furnace Occupancy cycle is long, it takes 60-72 hours, which becomes the bottleneck of production capacity

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