High-pressure cold airflow steel billet descaling device

Abstract

The utility model relates to a high-pressure cold airflow steel billet descaling device which comprises a rack and a blowing mechanism, a plurality of rotatable guide wheels are arranged on the rack at intervals, the blowing mechanism comprises a plurality of air outlet pipes connected with a high-pressure cold air source, the air outlet pipes are located between the adjacent guide wheels, the air outlet pipes are provided with arc-shaped air outlets, and the air outlets are communicated with the guide wheels. The air outlets of the multiple air outlet pipes can be combined to form annular air outlet, so that when the high-temperature hot billet advances towards the blowing mechanism under the support of the guide wheels and passes through the annular air outlet, high-pressure cold air flow sprayed out of the air outlets enables the surface oxide scale to be rapidly cooled, shrunk and cracked after the hot billet is cooled; iron oxide is stripped from the surface of the hot steel billet along with high-pressure cold air flow through high-pressure cleaning to achieve descaling, the problems that a large number of water resources are wasted, the environment is affected and iron oxide corrosion is increased are solved through high-pressure water flow descaling, the waste recovery rate is increased, and the steel billet descaling effect is improved by replacing point blowing with annular air outlet. And the device can be adjusted to be suitable for surface cleaning treatment of billets of different specifications.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel billet surface cleaning equipment, and in particular relates to a high-pressure cold air flow steel billet descaling device. Background Art

[0002] In the steel rolling production line, the first process of steel rolling is to heat the steel billet in the heating furnace. The steel billet is generally heated to 1050-1200℃ and then taken out of the furnace. However, due to the contact between the steel billet and the air at high temperature, the steel billet will be oxidized at high temperature, and a dense layer of iron oxide scale will form on the surface of the steel billet. If this layer of iron oxide scale cannot be removed before rolling, the iron oxide scale will be pressed into the surface of the strip by the roller during the rolling process, affecting its surface quality. The residual iron oxide scale will also accelerate the wear of the roller and reduce the service life of the roller. At the same time, it also aggravates the pollution to the surrounding environment, resulting in increased production costs and reduced economic benefits. Therefore, removing the iron oxide scale on the surface of the steel billet before rolling, i.e. descaling, is necessary to ensure the surface quality of the finished steel and reduce the pollution of the surrounding environment.

[0003] Currently, the most commonly used equipment for removing iron oxide scale is the high-pressure water descaling device, which is installed on the discharge side of the heating furnace, arranged between the heating furnace outlet and the rough rolling roller. It adopts the principle of high-pressure jet cutting and uses a descaling pump station to provide 15-25MPa high-pressure water. The high-pressure water is sprayed onto the surface of the steel billet through descaling nozzles arranged at a certain distance and angle. After the cooling effect, rupture effect and steam scouring effect, more than 95% of the iron oxide scale on the surface of the steel billet is eliminated. However, the iron oxide washed by high-pressure water flow is prone to rust, which has a great impact on the recycling and reuse of iron oxide. At the same time, when using high-pressure water flow for descaling, a large amount of water resources will be wasted, and the wastewater contains a large amount of heavy metals, which pollutes the environment. To this end, CN101069898A and other publications disclose a device and method for descaling with high-pressure airflow, in which the high-pressure airflow is sprayed onto the surface of the hot billet while the hot billet passes through a high-pressure airflow nozzle, impacting the hot billet and generating resonance with the iron oxide scale of the hot billet. Under the impact and resonance of the airflow, the iron oxide scale is broken and separated from the billet, and the broken iron oxide scale is blown away from the hot billet by the airflow for descaling, which can improve the problems of the above-mentioned high-pressure water descaling device, but its main defect is that the airflow of the existing high-pressure airflow descaling device is in point contact with the hot billet passing through, and fails to cover the circumference of the hot billet, especially for billets with larger specifications. The iron oxide scale on the circumference of the hot billet is not fully broken, which is not conducive to the peeling of the iron oxide scale, resulting in poor descaling effect; secondly, the air blowing position of the airflow is fixed and cannot be adjusted, which is not convenient for adapting to the descaling requirements of billets of different specifications; in addition, after the high-pressure airflow, a small amount of iron oxide scale residue will be left on the surface of the hot billet, resulting in less than ideal descaling effect. Utility Model Content

[0004] The utility model aims to solve at least one of the above technical problems to a certain extent. The utility model provides a high-pressure cold air flow steel billet descaling device, which can improve the steel billet descaling effect and can be adjusted to be suitable for surface cleaning of steel billets of different specifications.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A high-pressure cold air flow steel billet descaling device comprises a frame and at least one purge mechanism, wherein the frame is provided with a plurality of spaced and rotatable guide wheels, the purge mechanism comprises a plurality of air outlet pipes connected to a high-pressure cold air source, the plurality of air outlet pipes are located between adjacent guide wheels, the air outlet pipes are provided with arc-shaped air outlets, the axial direction of the air outlets is perpendicular to the axial direction of the guide wheels, and the air outlets of the plurality of air outlet pipes can be combined into a ring-shaped air outlet.

[0007] Furthermore, the purge mechanism includes two air outlet pipes arranged opposite to each other, and the air outlets are semicircular.

[0008] Furthermore, an adjustable bracket is provided between the air outlet pipe and the frame, and the adjustable bracket is used to drive the air outlet pipe to move up and down and to move left and right parallel to the axis of the guide wheel.

[0009] Furthermore, the rack is provided with a plurality of rows of mounting holes, and the adjustable bracket is detachably connected to each row of mounting holes.

[0010] Furthermore, the adjustable bracket includes a positioning block, and the positioning block is provided with a first threaded rod that is threadably matched with the mounting hole.

[0011] Furthermore, the adjustable bracket includes a positioning block and a horizontal second threaded rod, the positioning block is connected to the frame, the second threaded rod is threadedly matched with the positioning block, the end of the second threaded rod is movably connected to the air outlet duct, and a limit member is provided between the air outlet duct and the frame, and the limit member is used to limit the deflection of the air outlet duct.

[0012] Furthermore, it comprises an air cooler, wherein an air supply pipe is provided between the air cooler and the air outlet pipe, wherein the air supply pipe comprises a first telescopic pipe and a second telescopic pipe, wherein the first telescopic pipe can be telescopic in the vertical direction, and the second telescopic pipe can be telescopic in the horizontal direction.

[0013] Furthermore, the frame is provided with a steel wire brush located behind the blowing mechanism.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] (1) The high-temperature hot steel billet moves toward the purge mechanism under the support of the guide wheel of the utility model. When it passes through the annular air outlet composed of the air outlets of a plurality of air outlet pipes, the high-pressure cold air source is ejected from the arc-shaped air outlet, which can form a high-pressure cold air flow covering the circumference of the hot steel billet, so that the iron oxide scale on the surface of the hot steel billet is rapidly cooled, shrunken and ruptured after being cooled. The iron oxide is peeled off the surface of the hot steel billet along with the high-pressure cold air flow by high-pressure cleaning to achieve descaling. Compared with high-pressure water flow descaling, there will be no waste of a large amount of water resources, impact on the environment and increase of iron oxide corrosion, and the waste recovery rate is increased. The annular air outlet can fully break the iron oxide scale on the circumference of the hot steel billet, which is conducive to the peeling of the iron oxide scale, and solves the problem of poor descaling effect caused by point contact between the airflow and the passing hot steel billet in the prior art.

[0016] (2) The utility model adopts an adjustable bracket to drive the air outlet pipe to move up and down and left and right parallel to the guide wheel axis. The distance from the air outlet to the surface of the hot steel billet can be adjusted to be appropriate. The air outlet can be combined to cover the circumference of the hot steel billet to meet the descaling requirements of steel billets of different specifications, thereby improving the applicability and flexibility of the device. It also has a simple structure and is easy to adjust.

[0017] (3) In order to prevent the presence of residues on the steel billet after descaling, the hot steel billet is further cleaned with a wire brush to further improve the descaling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a right front top perspective view of an embodiment of the utility model;

[0020] Figure 2 It is a left rear bottom perspective view of an embodiment of the utility model;

[0021] Figure 3 It is a top view application schematic diagram of an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of an application of an embodiment of the utility model for descaling a small-sized steel billet;

[0023] Figure 5 This is a schematic diagram of an application of an embodiment of the utility model for descaling large-sized steel billets.

[0024] Markings in the figure: frame 1, bottom plate 101, side plate 102, support leg 103, mounting hole 104, vertical hole 105, horizontal hole 106; purge mechanism 2, air outlet pipe 201, air outlet 202, air supply pipe 203, first telescopic pipe 204, second telescopic pipe 205, connecting pipe 206; guide wheel 3, arc groove 301; adjustable bracket 4, positioning block 401, first threaded rod 402, positioning knob 403, second threaded rod 404, adjusting knob 405; air cooler 5, wire brush 6, hot steel billet 7, Figure 4 and Figure 5 The arrows in the diagram indicate the direction of air flow. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the present utility model, it should be understood that the terms "middle", "longitudinal", "lateral", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In view of the problem in the prior art that the iron oxide scale on the circumference of the hot steel billet is not fully broken due to the point contact between the airflow and the hot steel billet passing through, Figure 1-3As shown, a preferred embodiment of a high-pressure cold air flow billet descaling device according to the utility model is provided. The descaling device comprises a frame 1 and at least one purge mechanism 2. The frame 1 is provided with a plurality of spaced and rotatable guide wheels 3. The guide wheels 3 are used for rolling with the hot billet 7 to support the hot billet 7 to move forward. The purge mechanism 2 comprises a plurality of air outlet pipes 201 connected to a high-pressure cold air source. The plurality of air outlet pipes 201 are located between adjacent guide wheels 3. The air outlet pipes 201 are provided with arc-shaped air outlets 202. The axial direction of the air outlet 202 is perpendicular to the axial direction of the guide wheel 3. The air outlets 202 of the plurality of air outlet pipes 201 can be combined into a ring-shaped air outlet.

[0029] Because the steel billet still has a certain high temperature after being taken out of the furnace, when the hot steel billet 7 passes through the purging mechanism 2, the annular air outlet can cover the circumference of the hot steel billet 7. After encountering the high-pressure cold air, the iron oxide on the surface will rapidly cool down and shrink, thereby achieving the effect of descaling. Compared with the traditional high-pressure water flow descaling, it will not waste a lot of water resources, will not have an impact on the environment, and will not increase the rust of iron oxide, thereby increasing the waste recovery rate. Compared with the existing point-contact airflow descaling device, the use of annular air outlet can make the iron oxide scale on the circumference of the hot steel billet 7 fully broken, which is beneficial to the peeling of the iron oxide scale, thereby improving the descaling effect.

[0030] Furthermore, the guide wheel 3 is provided with an arc groove 301, which can cooperate with the hot steel billet 7 to position the hot steel billet 7, further improving the reliability of descaling.

[0031] Furthermore, the blowing mechanism 2 includes two oppositely arranged air outlet pipes 201, the air outlet 202 is semicircular, the air outlet pipe 201 can adopt a C-shaped pipe structure, the air inlet is located in the middle of the outer side of the air outlet pipe 201, and the air outlet 202 is located on the inner side of the air outlet pipe 201, then the air outlet 202 of the two air outlet pipes 201 can be in a circular shape to adapt to the shape of the round steel billet, thereby further simplifying the blowing mechanism 2.

[0032] Furthermore, an adjustable bracket 4 is provided between the air outlet duct 201 and the frame 1, and the adjustable bracket 4 is used to drive the air outlet duct 201 to move up and down and to move left and right axially parallel to the guide wheel 3. The air outlet duct 201 can be adjusted left and right and up and down to adapt to the descaling of steel billets of different specifications.

[0033] Furthermore, the frame 1 includes a base plate 101, side plates 102 and support legs 103, the side plates 102 are installed on both sides of the base plate 101, the support legs 103 are installed at the bottom of the base plate 101, the axle of the guide wheel 3 is installed on the two side plates 102, and the adjustable bracket 4 is installed on the side plates 102 for easy installation.

[0034] Furthermore, the frame 1 is provided with a plurality of rows of mounting holes 104, and the adjustable bracket 4 is detachably connected to each row of mounting holes 104. The mounting height can be adjusted by connecting the adjustable bracket 4 to the corresponding row of mounting holes 104, thereby realizing the up and down movement adjustment of the air outlet duct 201, and the structure is simpler.

[0035] Furthermore, the adjustable bracket 4 includes a positioning block 401, and the positioning block 401 is provided with a first threaded rod 402 that is threadedly matched with the mounting hole 104. There are two first threaded rods 402. One end of the first threaded rod 402 passes through the positioning block 401 and is connected to the mounting hole 104. The other end of the first threaded rod 402 is a positioning knob 403. The positioning knob 403 can be rotated to drive the first threaded rod 402 to rotate. By screwing the first threaded rod 402 out or in relative to the mounting hole 104, the adjustable bracket 4 and the mounting hole 104 can be quickly disassembled and assembled.

[0036] Furthermore, the adjustable bracket 4 includes a positioning block 401 and a horizontal second threaded rod 404, the positioning block 401 is connected to the frame 1, the second threaded rod 404 is threadedly matched with the positioning block 401, the end of the second threaded rod 404 is movably connected to the air outlet pipe 201, and a limiter is provided between the air outlet pipe 201 and the frame 1, and the limiter is used to limit the deflection of the air outlet pipe 201. The second threaded rod 404 can be rotated forward or reversely, and the second threaded rod 404 can move left and right relative to the limiter under the action of the threaded match. Since the limiter limits the deflection of the air outlet pipe 201, the air outlet pipe 201 can be driven to move left and right through the movable connection, the structure is simple, and the adjustment is convenient.

[0037] Furthermore, a vertical hole 105 is provided on the side panel 102, and the second threaded rod 404 can extend to the outside of the frame 1 through the vertical hole 105. The second threaded rod 404 is provided with an adjustment knob 405 located outside the frame 1. When adjusting up and down, the second threaded rod 404 can move in the vertical hole 105, and the adjustment knob 405 outside the frame 1 can be used to adjust and rotate the second threaded rod 404 to adjust left and right, which is convenient for adjustment and makes the device more compact.

[0038] like Figure 2As shown, further, it includes a cold air machine 5, an air delivery pipe 203 is provided between the cold air machine 5 and the air outlet pipe 201, the air delivery pipe 203 includes a first telescopic pipe 204 and a second telescopic pipe 205, the first telescopic pipe 204 can be telescopic in the vertical direction, the second telescopic pipe 205 can be telescopic in the horizontal direction, and the second telescopic pipe 205 corresponding to the plurality of air outlet pipes 201 is connected to the cold air machine 5 through a connecting pipe 206, so that the high-pressure cold air source generated by the cold air machine 5 can be transported into the cold air machine 5 through the connecting pipe 206 and each air delivery pipe 203. Into each air outlet pipe 201, when the air outlet pipe 201 moves up and down, the first telescopic tube 204 can be telescoped in the vertical direction to adapt to the position change; when the air outlet pipe 201 moves left and right, the second telescopic tube 205 can be telescoped in the horizontal direction to adapt to the position change. This hard connection can withstand higher temperatures than direct hose connection, and is convenient for quickly ensuring normal airflow after movement, thereby improving the life and stability of the device. At the same time, the hard conveying pipe can also serve as a limiter to limit the deflection of the air outlet pipe 201, facilitate the movement of the air outlet pipe 201, and further simplify the structure.

[0039] Furthermore, a horizontal hole 106 is provided on the bottom plate 101, and the first telescopic tube 204 passes through the horizontal hole 106 and is connected to the air outlet pipe 201. The connecting tube 206 and the second telescopic tube 205 are located below the bottom plate 101, which can further simplify the structure and provide heat insulation.

[0040] Furthermore, in order to prevent residues from remaining on the steel billet after descaling, the frame 1 is provided with a wire brush 6 located behind the blowing mechanism 2, and two wire brushes 6 are arranged opposite to each other to further remove surface residues on the steel billet and improve the descaling effect.

[0041] The working principle of the above high pressure cold air flow billet descaling device is as follows:

[0042] like Figure 3-5 As shown, the steel billet to be rolled is heated to a high-temperature hot steel billet 7 by a heating furnace. The hot steel billet 7 coming out of the heating furnace moves toward the purging mechanism 2 under the support of the guide wheel 3, and passes through the annular air outlet composed of the air outlet 202 of a plurality of air outlet pipes 201. When passing through, the air cooler 5 delivers high-pressure cold air to each air outlet pipe 201 through the connecting pipe 206 and the air supply pipe 203. The high-pressure cold air is ejected from the arc-shaped air outlet 202 to form a high-pressure cold air flow covering the circumference of the hot steel billet 7. The high-pressure cold air flow is used to perform high-pressure cleaning of the iron oxide on the surface of the steel billet. After the hot steel billet 7 encounters the high-pressure cold air, the iron oxide on the surface will rapidly cool down, shrink and rupture, and the iron oxide will be peeled off from the surface of the hot steel billet 7 by the high-pressure cold air flow. Finally, the hot steel billet 7 passes through the wire brush 6, and the wire brush 6 is used to brush the surface of the hot steel billet 7 to further remove the surface residue and achieve the descaling effect.

[0043] like Figure 4As shown, when the specification, i.e., the diameter, of the hot steel billet 7 is small, the position of the air outlet pipe 201 can be adjusted downward to align with the hot steel billet 7, then the first telescopic tube 204 contracts in the vertical direction, and the air outlet pipe 201 is moved left and right to adjust the distance between the two air outlet pipes 201, then the second telescopic tube 205 extends in the horizontal direction, so that the distance from the air outlet 202 to the surface of the hot steel billet 7 is appropriate, which is suitable for descaling of small-sized hot steel billets 7.

[0044] like Figure 5 As shown, when the specification of the hot steel billet 7, i.e., the diameter, is relatively large, the position of the air outlet pipe 201 can be adjusted upward to align with the hot steel billet 7, then the first telescopic tube 204 is extended in the vertical direction, and the air outlet pipe 201 is adjusted by moving left and right to increase the distance between the two air outlet pipes 201, then the second telescopic tube 205 is contracted in the horizontal direction, so that the distance from the air outlet 202 to the surface of the hot steel billet 7 is adapted to the descaling of large-sized hot steel billets 7; similarly, when there are multiple purge mechanisms 2, one or more purge mechanisms 2 can be adjusted to stagger the air outlet pipes 201 of adjacent purge mechanisms 2, so that the air outlets 202 of multiple purge mechanisms 2 can be combined to cover the circumference of the hot steel billet 7, further expanding the scope of application, so as to meet the descaling needs of billets of different specifications.

[0045] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the protection scope of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-pressure cold air flow billet descaling device, characterized in that: The invention comprises a frame (1) and at least one purge mechanism (2), wherein the frame (1) is provided with a plurality of spaced and rotatable guide wheels (3), the purge mechanism (2) comprises a plurality of air outlet pipes (201) connected to a high-pressure cold air source, the plurality of air outlet pipes (201) are located between adjacent guide wheels (3), the air outlet pipes (201) are provided with arc-shaped air outlets (202), the axial direction of the air outlet (202) is perpendicular to the axial direction of the guide wheel (3), and the air outlets (202) of the plurality of air outlet pipes (201) can be combined into a ring-shaped air outlet.

2. The high-pressure cold air flow billet descaling device according to claim 1 is characterized in that: The purge mechanism (2) comprises two air outlet pipes (201) arranged opposite to each other, and the air outlet (202) is semicircular.

3. The high-pressure cold air flow billet descaling device according to claim 1, characterized in that: An adjustable bracket (4) is provided between the air outlet pipe (201) and the frame (1), and the adjustable bracket (4) is used to drive the air outlet pipe (201) to move up and down and to move left and right in parallel to the axial direction of the guide wheel (3).

4. The high-pressure cold air flow billet descaling device according to claim 3 is characterized in that: The frame (1) is provided with a plurality of rows of mounting holes (104), and the adjustable bracket (4) is detachably connected to each row of mounting holes (104).

5. The high-pressure cold air flow billet descaling device according to claim 4, characterized in that: The adjustable bracket (4) comprises a positioning block (401), and the positioning block (401) is provided with a first threaded rod (402) threadably matched with the mounting hole (104).

6. The high-pressure cold air flow steel billet descaling device according to claim 3, characterized in that: The adjustable bracket (4) comprises a positioning block (401) and a horizontal second threaded rod (404); the positioning block (401) is connected to the frame (1); the second threaded rod (404) is threadedly matched with the positioning block (401); the end of the second threaded rod (404) is movably connected to the air outlet pipe (201); a limiting member is provided between the air outlet pipe (201) and the frame (1); the limiting member is used to limit the deflection of the air outlet pipe (201).

7. The high-pressure cold air flow billet descaling device according to claim 3, characterized in that: It comprises an air cooler (5), wherein an air supply pipe (203) is provided between the air cooler (5) and an air outlet pipe (201), wherein the air supply pipe (203) comprises a first telescopic pipe (204) and a second telescopic pipe (205), wherein the first telescopic pipe (204) can be telescopic in a vertical direction, and the second telescopic pipe (205) can be telescopic in a horizontal direction.

8. A high pressure cold air flow billet descaling device according to any one of claims 1 to 7, characterized in that: The frame (1) is provided with a steel wire brush (6) located behind the blowing mechanism (2).

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