CN201144264Y - Reduction annealing furnaces for hot-dip galvanizing - Google Patents

Abstract

The utility model relates to an annealing furnace used in hot-dip galvanizing process, which comprises a frame, wherein the top and the bottom parts of the frame are both provided with a plurality of furnace rollers with to drive the metal bands; the anterior and posterior sides of the frame are respectively provided with a plurality of W-radiant tubes; one of the anterior or posterior sides of the frame is an operating side, while the other is a driving side. The radiant tubes at the operating side are arranged in 6 layers in the vertical direction and are parallel in the vertical direction with a total of 45; the radiant tubes at the driving side are arranged in 6 layers in the vertical direction and are parallel in the vertical direction with a total of 42. The annealing furnace of the utility model has the advantages of good air tightness, few furnace rollers, long service life, low maintenance costs, the metal bands are restored fully, the quality of the products is high, and the utility model is conducive to the forming of plate shapes. At the same time the length of the furnace is shortened and the heat efficiency of the furnace is high.

Description

Reduction annealing furnaces for hot-dip galvanizing

technical field

The utility model belongs to the field of hot-dip galvanizing production, in particular to a reduction annealing furnace used in the hot-dip galvanizing process.

Background technique

The reduction annealing furnace, also known as the tower furnace, is the core equipment of the hot-dip plating production line. Its main function is to heat, keep warm, cool and evenly heat the strip steel according to the requirements of the production product level and the corresponding annealing heat treatment curve, and complete the strip steel production line. Recrystallization annealing and bring the strip to the required temperature before entering the zinc pot. At the same time, there is a high-purity protective gas in the furnace, and the iron oxide film on the surface of the strip steel is fully reduced to sponge-like pure iron at high temperature, thereby ensuring a good bonding strength between the strip steel matrix and the zinc liquid. The currently used reduction furnace has the defects of insufficient airtightness of the furnace and insufficient reduction of strip steel in the furnace.

Contents of the invention

In order to solve the above technical problems, the utility model provides a reduction annealing furnace for hot-dip galvanizing process which has good airtightness, fewer furnace rolls, sufficient strip steel reduction in the furnace and long service life.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: the utility model comprises a frame, and the upper and lower sides of the frame are respectively provided with several matching furnace rollers that drive the steel belt, and the front and rear of the frame Several W-shaped radiant tubes are respectively arranged on both sides, and one of the front and rear sides of the frame is the operation side and the other is the transmission side.

As a preference, there are four furnace rollers on the upper and lower sides of the frame respectively.

As a preference, the radiant tubes on the operating side are arranged in 6 layers in the vertical direction and arranged in parallel in the vertical direction, with a total of 45 tubes.

As a preference, the radiant tubes on the transmission side are arranged in 6 layers in the vertical direction and arranged in parallel in the vertical direction, with a total of 42 tubes.

As a preference, the heating section is between the first furnace roll and the second furnace roll, the soaking section is between the second furnace roll and the third furnace roll, and the heating zone is between the third furnace roll and the fourth furnace roll. Warming section; said uniform temperature section is connected to the fast cooling section through a horizontal passage.

As a preference, the fast cooling section is provided with a cooling wind box and 12 electric heating radiant tubes.

The beneficial effects of the utility model are: the furnace has good air tightness, the number of furnace rollers used is small, and the service life is long; the maintenance cost is low, the strip steel in the furnace is fully restored, and the product quality is good, which is conducive to improving the plate shape; High thermal efficiency.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model.

Detailed ways

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Embodiment 1: the reduction annealing furnace for the hot-dip galvanizing process of this embodiment, as shown in Figure 1, includes a frame 1, next to the frame is a workbench 2, and the upper and lower sides of the frame 1 are respectively equipped with four matching Furnace roller 4 that drives the steel belt 3, 8 furnace rollers are combined into two groups, the upper side is the first group, the lower side is the second group, the center elevation of the lower furnace roller is 3500mm, and the center elevation of the upper furnace roller is 18500mm. The roller center roller spacing is 15000mm.

W-shaped radiant tubes are respectively installed on the front and rear sides of the frame, one side is the operation side and the other side is the transmission side. The radiant tubes 5 on the operation side are arranged in 6 layers in the vertical direction and arranged in parallel in the vertical direction, a total of 45; the radiant tubes on the transmission side are arranged in 6 layers in the vertical direction and arranged in parallel in the vertical direction, a total of 42.

Between the first furnace roll 4-1 and the second furnace roll 4-2 is a heating section, between the second furnace roll 4-2 and the third furnace roll 4-3 is a soaking section, and the third furnace roll 4-3 Between the fourth furnace roller 4-4 is a uniform temperature section; the uniform temperature section is connected to the fast cooling section 7 through a horizontal passage 10; the fast cooling section 7 is equipped with cooling wind boxes 8 and 12 electric heating radiant tubes 9 . The function of the heating section and the soaking section is to heat the strip to the annealing temperature and keep it warm for a period of time according to the recrystallization requirements. The steel strip enters the fast cooling section from the uniform temperature section through a horizontal passage. The fast cooling section has two strokes. The strip steel passes through the cooling air boxes installed on both sides, and 3 sets of circulating fans draw out the hot protective gas in the furnace. After cooling, it blows into the bellows, and sprays evenly on the surface of the strip from the nozzle holes of the bellows, so as to realize the cooling of the strip. There are 12 electric heating radiant tubes in the furnace, each 25KW, which are used to heat the thin strip steel or start the cold furnace.

The length of the steel strip in the furnace is 180 meters, and it stays in the furnace for 1.5 minutes at a unit operating speed of 120 m/min, including 0.75 minutes in the heating section, 0.25 minutes in the soaking section, and 0.5 minutes in the cooling section.

The furnace of the utility model has good air tightness, fewer furnace rollers, long service life, low maintenance cost, sufficient strip steel reduction in the furnace, good product quality, and is beneficial to improving the shape of the plate. At the same time, the length of the furnace is shortened, and the thermal efficiency of the furnace is high.

Claims (6)

1. A reduction annealing furnace for hot-dip galvanizing process, comprising a frame, characterized in that the upper and lower sides of the frame are respectively provided with several matching furnace rollers that drive the steel strip, and the front and rear sides of the frame are respectively There are several W-shaped radiant tubes, one of the front and rear sides of the frame is the operation side, and the other is the transmission side. 2. The reduction annealing furnace for hot-dip galvanizing process according to claim 1, characterized in that there are four furnace rollers on the upper and lower sides of the frame. 3. The reduction annealing furnace for hot-dip galvanizing process according to claim 1, characterized in that the radiant tubes on the operating side are arranged in 6 layers in the vertical direction, and are arranged in parallel in the vertical direction, with a total of 45 tubes. 4. The reduction annealing furnace for hot-dip galvanizing process according to claim 1, characterized in that the radiant tubes on the transmission side are arranged in 6 layers in the vertical direction, and are arranged in parallel in the vertical direction, with a total of 42 tubes. 5. The reduction annealing furnace for hot-dip galvanizing process according to claim 1 or 2, characterized in that there is a heating section between the first furnace roll and the second furnace roll, and between the second furnace roll and the third furnace roll between the third furnace roll and the fourth furnace roll is a temperature equalization section; the temperature equalization section is connected to the fast cooling section through a horizontal passage. 6. The reduction annealing furnace for hot-dip galvanizing process according to claim 5, characterized in that the fast cooling section is provided with a cooling wind box and 12 electric heating radiant tubes.

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