Arranging structure of heaters on bearing-steel isothermal spheroidized annealing furnace

Abstract

The invention discloses an arranging structure of heaters on a bearing-steel isothermal spheroidized annealing furnace. Bearing steel on an upper layer of driving roller set and a lower layer of driving roller set respectively is made to enter a hearth from a front furnace mouth and a rear furnace mouth and is conveyed in opposite directions, and the diagonal symmetrical arrangement of the heaters ensures the heating, insulating and isothermal treatment of the bearing steel on the upper layer of driving roller set and the lower layer of driving roller set and ensures the annealing treatment effect of the two layers of the bearing steel in the two directions. Accordingly, if high-temperature bearing steel to be conveyed out of the furnace mouth is conveyed on one of the upper layer of driving roller set and the lower layer of driving roller set, i.e. the high-temperature bearing steel is conveyed out of an isothermal chamber and made to enter an afterheat recovery exchanger chamber, normal-temperature bearing steel (also called as cold burden) which is just made to enter the furnace mouth is conveyed on the other layer of driving roller set, and the high-temperature bearing steel and the normal-temperature bearing steel can exchange heat so that the temperature of the normal-temperature bearing steel rises, the heat of the high-temperature bearing steel is recovered, and the heat needed for subsequently entering the isothermal chamber is reduced and energy is saved. In an intercooling chamber, a cooler can cool the high-temperature bearing steel discharged from a heating and insulating chamber while the high-temperature bearing steel and the lower-temperature bearing steel on the upper layer of driving roller set and the lower layer of driving roller set can exchange heat so that heat needed by lower-temperature bearing steel to subsequently enter the heating and insulating chamber is lowered, the energy is saved and heat waste is reduced.

Description

technical field [0001] The invention relates to an arrangement structure of heaters on an isothermal spheroidizing annealing furnace for bearing steel. Background technique [0002] In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller group for conveying the bearing steel is arranged in the furnace. The isothermal spheroidizing annealing process, in which heating, heat preservation, and isothermal process steps require heaters, and the arrangement of heaters is a very important factor affecting the effect of annealing treatment. The existing heaters are arranged above and below the single-layer drive roller group On the other hand, the annealed bearing steel usually reaches 550°C, and it needs to be cooled after being output from the furnace. Below 550°C, it will not affect the spheroidized annealed structure of the bearing steel material, but the bearing steel still has a large heat capacity. , a large amount of heat ene...

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Problems solved by technology

[0002] In the existing isothermal spheroidizing annealing furnace for bearing steel, a single-layer drive roller group for conveying the bearing steel is arranged in the furnace. The isothermal spheroidizing annealing process, in which heating, heat preservation, and isothermal process steps require heaters, and the arrangement of heaters is a very important factor affecting the effect of annealing treatment. The existing heaters are arranged above and below the single-layer drive roller group On the other hand, the annealed bearing steel usually reaches 550°C, and it needs to be cooled after being output from the furnace. Below 550°C, it will not affect the spheroidized annealed structure of the bearing steel material, but the bearing steel still has a large heat capacity. , a large amount of heat energy will be wasted with the cooling of materials, which not only wastes heat energy, but also pollutes the environment

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