Box type heat treatment device

Abstract

The invention discloses a box type heat treatment device, which comprises a furnace body (5), a furnace body panel (6) and an electric heating wire belt (2). The inner side surface of the furnace body (5) is provided with a furnace lining (1), wherein the gap is arranged between the furnace lining (1) and the furnace body (5), and the material of the furnace lining (1) is high temperature resistant fiber cotton. The electric heating wire belt (2) is fixed on the furnace lining (1). With the technical scheme of the present invention, the furnace wall heat storage is reduced, such that the heating time of the blank furnace is shortened, the heat energy is saved, and the thermal insulation effect of the heat treatment furnace is improved; the phenomena similar to refractory brick structure oxidizing, re-qualitation, and the like are overcome, the performance of the device is stabilized, the service life of the device is prolonged, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of industrial heat treatment equipment, and relates to metal material heat treatment technology. More specifically, the invention relates to a box-type heat treatment equipment. Background technique [0002] With the large-scale development of heat treatment technology, the modernization requirements for metal material heat treatment equipment are also getting higher and higher. [0003] Traditional heat treatment equipment has high energy consumption, serious pollution and low degree of automation. [0004] At present, the box-type heat treatment resistance furnace widely used in the field of heat treatment, one of its key parts, the lining, is made of heavy or light refractory bricks. This kind of brick structure has a gap between the furnace door and the door frame, which will make the inside of the furnace Hot air overflows along the gap on the upper side, while cold air flows in along the outer edge of...

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Problems solved by technology

[0003] Traditional heat treatment equipment has high energy consumption, serious pollution and low degree of automation

[0004] At present, the box-type heat treatment resistance furnace widely used in the field of heat treatment, one of its key parts, the lining, is made of heavy or light refractory bricks. This kind of brick structure has a gap between the furnace door and the door frame, which will make the inside of the furnace Hot air overflows along the gap on the upper side, while cold air flows in along the outer edge of the lower side, causing the temperature of the material near the furnace door to be significantly lower; Heat energy is lost directly from the joint between the trolley and the furnace lining

[0005] The furnace lining is a brick structure, which makes the furnace body bulky and difficult to transport, and the refractory bricks are easy to loose and damaged, which is inconvenient for masonry and maintenance, time-consuming and labor-intensive, and the thermal stability and thermal insulation effect are also poor; after repeated high temperature and normal temperature conversion , the refractory bricks oxidize with the moisture in the air to varying degrees, and gradually peel off; the preliminary qualitative brick structure of the furnace is sintered to form a secondary qualitative shrinkage after being heated.

[0006] The above-mentioned phenomenon does not exist in the heat treatment furnace whose lining is made of fiber cotton. Compared with the fiber cotton structure furnace, the service life of the brick furnace must be shorter.

Due to the unsatisfactory insulation performance of the brick furnace, the surface temperature of the furnace shell can reach above 70°C after heating

[0007] The resistance wire, one of the key parts of the existing resistance furnace, is a helical electric heating wire, which is obviously affected by temperature changes. When it encounters high temperature, it expands and elongates, falls and bends, resulting in a contact short circuit between the heating wire helix, which cannot be normal. work and also shorten the life of the furnace

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