A continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled strip steel.

Abstract

This invention discloses a continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled strip steel, relating to the field of rolling technology. The continuous rolling mill includes: at least two stands, which sequentially roll strip steel according to a stand sequence; emulsion nozzles are provided at both the upper and lower ends of the strip steel exiting the penultimate stand; first compressed air nozzles are provided at both the upper and lower ends of the strip steel before the entrance of the penultimate stand; a dam roll is provided on the upper surface of the strip steel exiting the penultimate stand; a tension gauge is provided on the lower surface of the strip steel exiting the dam roll; a guide roll is provided on the upper surface of the strip steel exiting the tension gauge; and a coiler is provided at the exit of the guide roll. This effectively reduces the cost of cleaning residual oil and iron on the strip steel surface in subsequent processes and improves the quality of surface cleaning.

Description

Technical Field

[0001] This invention relates to the field of rolling technology, and in particular to a continuous rolling mill for reducing residual oil and iron on the surface of cold-hardened coiled strip steel. Background Technology

[0002] During cold rolling, the use of emulsions inevitably results in residual oil and iron on the surface of the cold-rolled strip. Before annealing, significant resources are required to remove this residual oil and iron through various methods such as electrolysis, alkaline washing, brushing, and high-temperature desalination, leading to a substantial increase in costs. Reducing the residual oil and iron content on the surface of the cold-rolled strip can lower the cost of cleaning the strip during the continuous annealing process and also reduce the formation of nodules on the annealing furnace rolls to some extent. Summary of the Invention

[0003] The purpose of this invention is to provide a continuous rolling mill that reduces residual oil and iron on the surface of cold-rolled strip steel, effectively reducing the cost of cleaning residual oil and iron on the surface of strip steel in subsequent processes and improving the quality of surface cleaning.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] One aspect of this invention provides a continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled strip steel. The continuous rolling mill includes: at least two stands, which sequentially roll strip steel according to the stand sequence; emulsion nozzles are provided at both the upper and lower ends of the strip steel exiting the penultimate stand of the at least two stands; first compressed air nozzles are provided at both the upper and lower ends of the strip steel before the entrance of the penultimate stand of the at least two stands; a dam roll is provided on the upper surface of the strip steel exiting the penultimate stand of the at least two stands; a tension gauge is provided on the lower surface of the strip steel exiting the dam roll; a guide roll is provided on the upper surface of the strip steel exiting the tension gauge; and a coiler is provided at the exit of the guide roll.

[0006] In some embodiments, a second compressed air nozzle is provided at both the upper and lower ends of the strip between the tension gauge outlet and the guide roller inlet.

[0007] In some embodiments, the emulsion nozzles are arranged in 1 to 3 rows from left to right along the process direction, the first compressed air nozzles are arranged in 1 to 3 rows from left to right along the process direction, and the second compressed air nozzles are arranged in 1 to 3 rows from left to right along the process direction; each of the 1 to 3 rows of emulsion nozzles has 7 emulsion nozzles arranged from front to back, each of the 1 to 3 rows of first compressed air nozzles has 7 first compressed air nozzles arranged from front to back, and each of the 1 to 3 rows of second compressed air nozzles has 7 second compressed air nozzles arranged from front to back.

[0008] In some embodiments, the emulsion nozzles are provided in two rows, the first compressed air nozzles are provided in one row, and the second compressed air nozzles are provided in two rows.

[0009] In some embodiments, the pressure of both the first compressed air nozzle and the second compressed air nozzle is 0.4~0.6 MPa.

[0010] In some embodiments, the angle between the strip between the dam roller and the tension gauge and the horizontal line is 12°~15°.

[0011] In some embodiments, the at least two racks include a first rack, a second rack, a third rack, a fourth rack, and a fifth rack, which are arranged sequentially from left to right along the process direction.

[0012] In some embodiments, the surface roughness of the working roller of the first frame is 0.3 μm to 0.4 μm.

[0013] In some embodiments, the surface roughness of the working rollers of the second frame, the third frame, and the fourth frame is 0.35 μm to 0.5 μm.

[0014] In some embodiments, the surface roughness of the working roller of the fifth frame is below 0.25 μm.

[0015] According to an embodiment of the present invention, a continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled strip steel has at least the following beneficial effects: While maintaining the existing emulsion system and rolling process in the pickling continuous rolling line, the residual oil and iron content on the surface of the rolled strip steel is reduced by adjusting the surface roughness of the work rolls, controlling the strip steel temperature through emulsion nozzles, and adjusting the purging arrangement of the first and second compressed air nozzles. This effectively reduces the cost of cleaning residual oil and iron on the strip steel surface in subsequent processes and improves the quality of strip steel surface cleaning. It has very broad promotion and application value in cold rolling mills.

[0016] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this disclosure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a front view structural diagram according to an embodiment;

[0019] Figure 2 This is an enlarged structural diagram of part A according to an embodiment;

[0020] Figure 3 This is a top view of the left side of the first compressed air nozzle according to an embodiment.

[0021] The reference numerals in the attached figures are explained as follows: 1. Emulsion nozzle; 2. First compressed air nozzle; 3. Dam roller; 4. Tension gauge; 5. Guide roller; 6. Winding machine; 7. Second compressed air nozzle. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0027] The technical solutions of the embodiments of this application are briefly described below:

[0028] According to some embodiments, such as Figure 1 , Figure 3 As shown, this application provides a continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled coiled strip steel, the continuous rolling mill comprising:

[0029] At least two stands, wherein the at least two stands are used to roll strip steel sequentially according to the stand sequence;

[0030] Emulsion nozzles 1 are provided at both the upper and lower ends of the strip at the outlet of the penultimate frame of the at least two frames;

[0031] The first compressed air nozzle 2 is provided at both the upper and lower ends of the strip steel in front of the entrance of the penultimate frame of the at least two frames;

[0032] A dam roll 3 is provided on the upper surface of the strip at the exit of the penultimate frame of the at least two frames;

[0033] A tension gauge 4 is installed on the lower surface of the strip at the outlet of the dam roller 3;

[0034] A guide roller 5 is provided on the upper surface of the strip at the outlet of the tension meter 4;

[0035] A winding machine 6 is provided at the outlet of the steering roller 5.

[0036] Based on the above embodiments, such as Figure 1 As shown, at least two stands are arranged from left to right according to the process. In some embodiments, strip is rolled sequentially from left to right according to the stand sequence, that is, the left side of the stand is the strip inlet and the right side of the stand is the strip outlet. In other embodiments, strip can also be rolled sequentially from right to left according to the stand sequence, that is, the right side of the stand is the strip inlet and the left side of the stand is the strip outlet. In the embodiments of this application, the method of rolling strip sequentially from left to right according to the stand sequence is selected.

[0037] Among them, multiple emulsion nozzles 1 are installed at the upper and lower ends of the strip at the outlet of the second to last frame. The emulsion nozzles 1 spray emulsion to cool and lubricate the strip.

[0038] like Figure 1 , Figure 3 As shown, multiple first compressed air nozzles 2 are installed at the upper and lower ends of the strip before the entrance of the last stand. The multiple first compressed air nozzles 2 are used to spray high-pressure gas with the air blowing direction to the left to spray the surface of the strip and clean the emulsion on the surface of the strip. This can prevent the emulsion from flowing to the last stand and can also play a role in cooling, reducing the residual oil and iron content on the surface of the strip after rolling.

[0039] The dam roll 3 is used to provide the wrap angle and tension of the strip, and the tension meter 4 is used to measure the tension of the strip and to cooperate with the dam roll 3 to form the wrap angle.

[0040] The guide roller 5 works in conjunction with the coiler 6 to coil the strip steel.

[0041] The following is in conjunction with the appendix to this instruction manual. Figures 1 to 3 The preferred embodiments of this disclosure will be further described in detail below.

[0042] According to some embodiments, such as Figure 1 As shown, a second compressed air nozzle 7 is provided at both the upper and lower ends of the strip between the outlet of the tension gauge 4 and the inlet of the steering roller 5.

[0043] Based on the above embodiments, multiple second compressed air nozzles 7 are used to spray high-pressure gas to spray the strip surface, reduce the strip temperature, and reduce the residual oil and iron content on the surface of the rolled strip.

[0044] According to some embodiments, the emulsion nozzle 1 is arranged in 1 to 3 rows from left to right along the process direction, the first compressed air nozzle 2 is arranged in 1 to 3 rows from left to right along the process direction, and the second compressed air nozzle 7 is arranged in 1 to 3 rows from left to right along the process direction.

[0045] Each of the 1-3 rows of emulsion nozzles 1 has 7 emulsion nozzles 1 arranged from front to back, such as Figure 3 As shown, each of the first compressed air nozzles 2 in rows 1 to 3 has 7 first compressed air nozzles 2 arranged from front to back, and each of the second compressed air nozzles 7 in rows 1 to 3 has 7 second compressed air nozzles 7 arranged from front to back.

[0046] Based on the above embodiments, in some embodiments, such as Figure 1 As shown, the emulsion nozzle 1 is provided in two rows, the first compressed air nozzle 2 is provided in one row, and the second compressed air nozzle 7 is provided in two rows.

[0047] Furthermore, the pressure of both the first compressed air nozzle 2 and the second compressed air nozzle 7 is 0.4~0.6 MPa.

[0048] Furthermore, such as Figure 2 As shown, the angle between the strip and the horizontal line (the wrap angle of the strip) between the dam roller 3 and the tension meter 4 is 12°~15°.

[0049] According to some embodiments, the at least two racks include a first rack, a second rack, a third rack, a fourth rack, and a fifth rack, which are arranged sequentially from left to right along the process direction.

[0050] In some embodiments, the surface roughness of the working roller of the first frame is 0.3 μm to 0.4 μm.

[0051] In some embodiments, the surface roughness of the working rollers of the second frame, the third frame, and the fourth frame is 0.35 μm to 0.5 μm.

[0052] In some embodiments, the surface roughness of the working roller of the fifth frame is below 0.25 μm.

[0053] While maintaining the existing emulsion system and rolling process in the pickling and rolling production line, the residual oil and iron content on the surface of the rolled strip was reduced by adjusting the surface roughness of the work rolls, controlling the strip temperature through the emulsion nozzle 1, and adjusting the purging arrangement of the first compressed air nozzle 2 and the second compressed air nozzle 7. This effectively reduced the cost of cleaning the strip surface for residual oil and iron in subsequent processes and improved the quality of strip surface cleaning. This method has broad application value in cold rolling mills.

[0054] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0055] Although this disclosure has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Because this disclosure can be embodied in many forms without departing from the spirit or substance of this application, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A continuous rolling mill for reducing residual oil and iron on the surface of cold-rolled strip steel, characterized in that, The continuous rolling mill includes: At least two stands, wherein the at least two stands are used to roll strip steel sequentially according to the stand sequence; Emulsion nozzles are provided at both the upper and lower ends of the strip exit of the penultimate frame of the at least two frames. A first compressed air nozzle is provided at both the upper and lower ends of the strip steel before the entrance of the penultimate frame of the at least two frames. A dam roll is provided on the upper surface of the strip at the exit of the penultimate of the at least two frames; A tension gauge is installed on the lower surface of the strip at the outlet of the dam roller; A guide roller is provided on the upper surface of the strip at the outlet of the tension meter; A winding machine is provided at the outlet of the steering roller; The angle between the strip and the horizontal line between the dam roller and the tension gauge is 12°~15°; the surface roughness of the working roller of the first frame is 0.3μm~0.4μm.

2. The continuous rolling mill according to claim 1, characterized in that, A second compressed air nozzle is provided at both the upper and lower ends of the strip between the tension gauge outlet and the guide roller inlet.

3. The continuous rolling mill according to claim 2, characterized in that, The emulsion nozzles are arranged in 1 to 3 rows from left to right along the process direction, the first compressed air nozzles are arranged in 1 to 3 rows from left to right along the process direction, and the second compressed air nozzles are arranged in 1 to 3 rows from left to right along the process direction. Each row of the 1st to 3rd rows of emulsion nozzles has 7 emulsion nozzles from front to back. Each row of the 1st to 3rd rows of first compressed air nozzles has 7 first compressed air nozzles from front to back. Each row of the 1st to 3rd rows of second compressed air nozzles has 7 second compressed air nozzles from front to back.

4. The continuous rolling mill according to claim 3, characterized in that, The emulsion nozzles are arranged in two rows, the first compressed air nozzles are arranged in one row, and the second compressed air nozzles are arranged in two rows.

5. The continuous rolling mill according to any one of claims 2 to 4, characterized in that, The pressure of both the first compressed air nozzle and the second compressed air nozzle is 0.4~0.6 MPa.

6. The continuous rolling mill according to claim 1, characterized in that, The at least two racks include a first rack, a second rack, a third rack, a fourth rack, and a fifth rack, which are arranged sequentially from left to right along the process direction.

7. The continuous rolling mill according to claim 6, characterized in that, The surface roughness of the working rolls in the second, third, and fourth frames is 0.35μm to 0.5μm.

8. The continuous rolling mill according to claim 6, characterized in that, The surface roughness of the working rollers of the fifth frame is below 0.25 μm.

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