Furnace door sealing device of box type protective atmosphere thermal treatment furnace

Abstract

The invention discloses a furnace door sealing device of a box type protective atmosphere thermal treatment furnace. The furnace door sealing device comprises a clamping ring, a driving device, a furnace door flange, a sealing flange and a sealing ring, wherein the driving device is used for driving the clamping ring to rotate; the furnace door flange and the sealing flange are correspondingly arranged on a furnace body and a furnace door; the sealing ring is arranged between the furnace door flange and the sealing flange; the clamping ring is sleeved on the furnace door flange; an inner flange extending radially inwards is arranged on one side, near the furnace body, of the clamping ring; holding flanges extending radially inwards and distributed annularly and uniformly are arranged on one side, near the furnace door, of the clamping ring; compressing building blocks matched with the holding flanges are arranged on the sealing flange; a compressing inclined surface used for being matched with each compressing building block when the furnace door is closed is arranged on the side, facing each holding flange, of the compressing building block; and the mechanical angle of the compressing building block is less than or equal to that of a gap between the adjacent holding flanges. The furnace door sealing device has stable and reliable sealing property and can adopt various types of protective atmosphere in the furnace. The products subjected to thermal treatment can be decarbonized without oxidation.

Description

technical field [0001] The invention relates to a furnace door sealing device, in particular to a furnace door sealing device for a box-type protective atmosphere heat treatment furnace. Background technique [0002] Heat treatment furnace is a general term for industrial furnaces used to perform various metal heat treatments on metal workpieces. Heat treatment furnaces can use various types of heating furnaces, but stricter control of furnace temperature and furnace atmosphere is required. The box-type heat treatment furnace is a periodic operation furnace widely used in metal heat treatment. In the process of heat treatment in the box-type heat treatment furnace, the poor sealing of the furnace door will not only easily cause the heat in the furnace to be lost from the furnace door. The entire heat treatment cycle time is lengthened, resulting in waste of energy, and the temperature of the material near the furnace door often does not reach the set temperature, which makes...

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Problems solved by technology

[0005] Although the furnace door sealing device suitable for a box-type heat treatment furnace adopts an inner and outer double-layer sealing structure, it can meet the sealing requirements of the heat treatment furnace to a certain extent, but since the furnace door rollers have to roll between the vertical guide groove and the horizontal guide groove , there must be a certain gap between the furnace door roller and the guide groove, which leads to the inability of the inner and outer sealing knives to press the sealing rings in the inner and outer sealing grooves well; There is also a gap necessary for sliding up and down, resulting in insufficient sealing performance

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