Balancing furnace with edge heating function

Abstract

The utility model relates to a reduction annealing furnace for continuously processing steel strips, in particular to a balancing furnace with an edge heating function, which comprises a balancing furnace body and a plurality of furnace rollers arranged at intervals along the running direction of strip steel, and a plurality of W-shaped electric heating tubes are arranged at the top and the bottom of the balancing furnace body. And the W-shaped electric heating pipes are respectively and oppositely distributed on the transmission side and the operation side of the balancing furnace body, so that the temperature in the balancing furnace is diffused from the edge part to the center. According to the utility model, the W-shaped electric heating pipes are oppositely distributed on the transmission side and the operation side of the balancing furnace body, so that the temperature distribution gradient in the balancing furnace is improved, the uniform heating temperature of the cross section of the thick strip steel is realized, and the problems of low edge temperature and high and non-uniform middle temperature of the thick strip steel in the heating and heat preservation processes are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the reduction annealing furnace of continuous processing steel band, especially a kind of equalizing furnace with edge heating function. BACKGROUND

[0002] When equalizing thick galvanized plate, the temperature difference between edge and center of steel band is large in the equalizing section (equalizing furnace) of horizontal steel band continuous reduction annealing furnace, which can make the temperature of edge of equalizing furnace low, and further cause zinc undulation defect, so that zinc liquid is accumulated in the edge of steel band, zinc scar or zinc tumor is formed, and the quality and appearance of galvanized plate are affected.The traditional equalizing furnace is mainly arranged with linear strip spiral surrounding electric heating radiation pipe on the upper and lower sides of steel band, and the steel band is covered in cross section to heat the steel band;The electric heating alloy material distributed in the linear strip spiral surrounding electric heating radiation pipe is uniformly distributed in the circumferential direction of pipe body, so that the temperature of pipe body outer surface tends to be consistent, and further the temperature gradient of the furnace type is consistent in the steel band transverse interface direction, but during the running of steel band in the furnace, the temperature of edge is lower than that of center, but the received radiation heat is similar, although the thin steel band below 3mm is alleviated by internal heat conduction, but for thick steel band above 3mm, the temperature of edge and center cannot be consistent due to the speed of heat conduction, so that the aforementioned defects occur in the subsequent galvanizing production of thick steel band.

[0003] In general, after the cooling of steel band through pretreatment fast cooling section, the temperature of edge is low, but the traditional equalizing furnace cannot realize the temperature uniformity of thick steel band in cross section direction, so it is not suitable for galvanizing production line with high thickness of steel band, so there is an urgent need to propose a new equalizing furnace to solve the above problems. INVENTION CONTENTS

[0004] Therefore, the purpose of the utility model is to provide a kind of equalizing furnace with edge heating function, which can realize the temperature diffusion from edge to center in furnace body, reduce the temperature aggregation in middle part, so as to realize the temperature uniformity of steel band in cross section direction after being radiated, and further realize the accurate control of furnace zone steel band cross section direction temperature, heat the edge steel band, save space and cost.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A kind of equalizing furnace with edge heating function, including equalizing furnace body and multiple furnace rollers arranged at intervals along the running direction of steel band, multiple W-type electric heating pipes are arranged at the top and bottom of the equalizing furnace body, and the W-type electric heating pipes are oppositely arranged and distributed on the drive side and the operation side of the equalizing furnace body respectively, to realize the temperature diffusion from edge to center in the equalizing furnace.

[0007] Further, the inner wall of the furnace body of the equalizing furnace is provided with a heat preservation layer for heat preservation and heat insulation.

[0008] Further, the W-shaped electric heating pipe is 24 in number, and the top and bottom of the furnace body of the equalizing furnace are each provided with 12 W-shaped electric heating pipes.

[0009] Further, two glow igniters are arranged on the drive side and the operation side of the furnace body of the equalizing furnace, and the two glow igniters are arranged at the two ends of the furnace body of the equalizing furnace respectively for burning oxygen in the furnace body of the equalizing furnace.

[0010] Further, a thermocouple is arranged on the drive side of the furnace body of the equalizing furnace for monitoring the temperature in the equalizing furnace.

[0011] The equalizing furnace with the edge heating function has the advantages that:

[0012] Compared with the conventional equalizing furnace with the linear strip spiral surrounding electric heating radiation pipe, the equalizing furnace with the edge heating function has the W-shaped electric heating pipe arranged oppositely and distributed on the drive side and the operation side of the furnace body of the equalizing furnace, the temperature distribution gradient in the equalizing furnace is improved, the heating temperature of the cross section of the thick strip steel is uniform, and the problem of the low edge temperature and the high middle temperature in the heating and heat preservation process of the thick strip steel is solved.

[0013] The thickness of the W-shaped electric heating pipe used in the equalizing furnace is much smaller than the diameter of the conventional linear strip spiral surrounding electric heating radiation pipe, so the height of the furnace body of the equalizing furnace can be reduced, the overall space of the equalizing furnace is saved, the cost is reduced, the investment is reduced, and the equalizing furnace has strong practicability.

[0014] Other advantages, objects and features of the present application will be apparent from the following detailed description of the application and from the claims. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the purposes, technical solutions and advantages of the present application clearer, the preferred embodiments of the present application will be described in detail below with reference to the drawings, in which:

[0016] Fig. 1 is a front view of the equalizing furnace with the edge heating function in the present application;

[0017] Fig. 2 is a left view of the equalizing furnace with the edge heating function in the present application;

[0018] Fig. 3It is the structural schematic view of the W type electric heating pipe in the utility model.

[0019] The figure mark: 1 - heat preservation layer;2 - equalizing furnace furnace body;3 - W type electric heating pipe;4 - furnace roller;5 - thermocouple;6 - glow igniter;7 - strip steel. DETAILED DESCRIPTION

[0020] The other advantages and effects of the utility model can be easily understood by the person skilled in the art from the content disclosed in the specification. The utility model can also be implemented or applied by another different specific embodiment, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the drawings provided in the following examples only illustrate the basic concept of the utility model in a schematic manner, and the following examples and features in the examples can be combined with each other without conflict.

[0021] Wherein, the drawing is only used for example explanation, and the representation is only a schematic view, not a real object drawing, and cannot be understood as the limitation of the utility model; In order to better illustrate the embodiment of the utility model, some components in the drawing can be omitted, enlarged or reduced, and the size of the actual product is not represented; For those skilled in the art, it is understandable that some known structures and their descriptions in the drawing can be omitted.

[0022] The same or similar signs in the drawings of the embodiments of the utility model correspond to the same or similar parts; In the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, the positional relationship described in the drawing is only used for example illustration, and cannot be understood as the limitation of the utility model, for the ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0023] Please refer to Figs. 1-3 It is a kind of equalizing furnace with edge heating function, the equalizing furnace is mainly used for galvanizing line or plate strip annealing furnace etc., to realize the temperature uniformity of thick plate strip steel (more than 3mm) in cross section direction, it includes equalizing furnace furnace body 2 and three furnace rollers 4 arranged along the running direction of strip steel 7;

[0024] The key is that a plurality of W-shaped electric heating pipes 3 are arranged on the top and bottom of the equalizing furnace body 2, and the W-shaped electric heating pipes 3 are oppositely arranged on the drive side and the operation side of the equalizing furnace body 2 respectively to realize the temperature diffusion from the edge to the center in the equalizing furnace.

[0025] Specifically, the W-shaped electric heating pipes 3 are oppositely arranged on the drive side and the operation side of the equalizing furnace body 2, which improves the temperature distribution gradient in the equalizing furnace and realizes the uniform heating temperature of the cross section of the strip.

[0026] Generally, the equalizing furnace is arranged between the fast cooling furnace and the hot stretching roller chamber, the strip 7 runs on the furnace roller 4 after entering the inlet of the equalizing furnace from the fast cooling furnace, and then passes out from the interface between the equalizing furnace and the hot stretching roller chamber, thereby realizing the temperature equalization of the strip 7 in the equalizing furnace.

[0027] Preferably, there is a 200mm thick heat preservation layer 1 on the inner wall of the equalizing furnace body 2 for heat preservation and heat insulation.

[0028] The 24 W-shaped electric heating pipes 3 are uniformly distributed on the top and bottom of the equalizing furnace body 2, 12 on the top and 12 on the bottom, and are arranged on the drive side and the operation side respectively for radiating the strip 7 to realize the edge heating of the strip.

[0029] Moreover, since the diameter of the traditional radiation pipe is 200mm and the thickness of the W-shaped electric heating pipe 3 is only 30mm, the height of the equalizing furnace body 2 can be reduced, thereby saving the overall space of the equalizing furnace and reducing the cost and investment.

[0030] Further, two glow igniters 6 are arranged on the drive side and the operation side of the equalizing furnace body 2 respectively for burning to prevent the residual and accumulation of oxygen in the furnace body.

[0031] Further, one thermocouple 5 is arranged on the drive side of the equalizing furnace body 2 for monitoring the temperature in the equalizing furnace.

[0032] In the embodiment, the strip 7 runs at high speed under the tension control of the furnace roller 4 in the equalizing furnace, maintains a certain temperature by absorbing the radiation heat of the 24 W-shaped electric heating pipes 3, and maintains the uniformity of the temperature of the strip 7 in the cross section direction by adjusting the power of the W-shaped electric heating pipes 3; the output power of the W-shaped electric heating pipes 3 is determined according to the width, thickness and running speed of the strip 7.

[0033] Finally, it is explained that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A balancing furnace with edge heating function, comprising a balancing furnace body and a plurality of furnace rollers arranged at intervals along the running direction of the strip, characterized in that: A plurality of W-shaped electric heating tubes are arranged on the top and bottom of the equalizing furnace body, and the W-shaped electric heating tubes are relatively arranged and distributed on the transmission side and the operation side of the equalizing furnace body, so as to realize the temperature in the equalizing furnace to diffuse from the edge to the center.

2. The equalizing furnace with edge heating function according to claim 1, characterized in that: A heat preservation layer is arranged on the inner wall of the equalizing furnace body for heat preservation and insulation.

3. The equalizing furnace with edge heating function according to claim 1, characterized in that: There are 24 W-shaped electric heating tubes, and 12 of them are located on the top and bottom of the equalizing furnace body.

4. The equalizing furnace with edge heating function according to claim 1, characterized in that: Two glow igniters are respectively provided on the transmission side and the operation side of the equalizing furnace body, and the two glow igniters are respectively arranged at both ends of the equalizing furnace body for burning oxygen in the equalizing furnace body.

5. The equalizing furnace with edge heating function according to claim 1, characterized in that: A thermocouple is provided on the transmission side of the equalizing furnace body for monitoring the temperature inside the equalizing furnace.

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