Flame cleaning machine shoe block for cleaning surface of steel billet

Abstract

The utility model provides a shoe block of a flame cleaning machine for cleaning the surface of a steel billet, which relates to the technical field of surface defect cleaning of steel billets in steelmaking production in the metallurgical industry and comprises a shoe block body, a cooling water channel and a step surface, the step surface is positioned at the working end of the shoe block body facing the billet surface; a plurality of bosses are arranged on the step surface; the shoe block body, the step face and the boss are of an integrated structure. And a wear-resistant layer is arranged on the boss. The shoe block is formed by processing a single base material, so that the overall heat-conducting property and hardness are uniform, the bosses on the step surface replace a friction plate which is independently arranged in the prior art, and scratches or abrasion caused by friction of non-convex parts on the step surface are avoided; the wear resistance of the shoe block is improved, the single service life is at least doubled, the repairable frequency is increased by more than three times, and the technical problems that the shoe block in the prior art is substantially easy to damage, difficult to repair, high in cost and short in continuous operation rate period are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cleaning surface defects of steel billets in steelmaking production in the metallurgical industry, and particularly relates to a flame cleaning machine shoe block for cleaning the surface of steel billets. Background Art

[0002] The rapid development of modern continuous casting technology has greatly improved the quality of continuous casting billets. However, under the existing technical conditions, surface defects of continuous casting billets cannot be completely eliminated. For example, longitudinal and transverse cracks, subcutaneous pinholes, slag inclusions, depressions, etc. appear on the surface of steel billets, thus affecting the quality of the final product. This is the main problem restricting high-end products.

[0003] To solve the above problems, automatic cleaning of surface defects of steel billets by a flame cleaning machine is now widely promoted. That is, the surface defects of 2-4 mm on the surface of the casting billet are melted, oxidized, and separated from the surface of the steel billet by flame, so that the steel billet can obtain a product with higher surface quality after subsequent processing, and better economic or social benefits can be achieved.

[0004] The core component of the flame cleaning machine for the surface of the steel billet is the flame burner. The flame burner is composed of a base, an upper preheating block, a lower preheating block or a shoe block. Among them, the shoe block is the closest to the steel billet and plays a key role in protecting the flame burner.

[0005] The structure of the previous shoe block was formed by integrating a copper matrix and a friction plate through a dovetail groove inlay structure (such as Figure 1As shown in the figure, the boot block base body is provided with a cooling water channel through which cooling circulating water flows, playing a role in cooling and protecting the boot block or the flame burner. Among them, the friction plate is made of wear-resistant alloy steel and mainly plays a role in positioning or isolation to prevent the billet from contacting the boot block base body and protect the boot block base body from damage. However, there are two major problems with this structure of the boot block during use: First, since the friction plate is a wear-resistant alloy and a nickel-based alloy, its thermal conductivity is relatively poor. Although the cooling of the copper base body can also cool the friction plate to a certain extent, due to the large difference in the thermal conductivity between the friction plate itself and the copper base body, and the two are not an integral structure, there is a thermal resistance in contact. Therefore, although the melting point temperature of the friction plate is high, due to being roasted by the high temperature of the flame, the splashing and dripping adhesion of molten steel or steel slag are likely to cause the friction plate to burn, melt, and produce scratches due to friction. Moreover, the irregular particles generated after burning and melting may scratch and rub the copper base body surface due to the slippage between the billet and the burner boot block, making the friction plate unable to protect the copper base body. Therefore, it will result in relatively frequent replacement during shutdown, affecting the continuous operation rate. Second, it is difficult to repair the boot block. Since the friction plate and the copper base body are embedded together through a dovetail groove, it is relatively difficult to repair again. Because when the friction plate and the copper base body are assembled, they are not only connected through the dovetail groove, but also often welded together by brazing for firm fixation. Therefore, repairing the dovetail groove is another problem, increasing the repair difficulty or cost.

[0006] In the prior art, for the machine cleaning burner boot block with improved service life, generally, the friction plate is moved backward to a position away from the flame spraying area, so that the splashing and dripping of molten steel or steel slag near the flame fall on the copper base body. Since the copper base body has strong cooling ability, the molten steel or steel slag is not easily directly adhered or fused with the copper base body. However, this does not fundamentally solve the cooling ability of the friction plate, nor does it completely solve the problem of the friction plate being corroded by the flame or molten steel or steel slag. At the same time, it does not reduce the friction and scratch damage to the copper base body, and cannot substantially solve the fundamental problem.

[0007] In view of this, the present utility model is specifically proposed. Summary of the Utility Model

[0008] One of the purposes of the present utility model is to provide a flame cleaning machine boot block for cleaning the surface of a billet, so as to at least solve the technical problems of easy damage, difficult repair, high cost, and short continuous operation rate cycle of the boot block in the prior art.

[0009] In order to achieve the above object of the present utility model, the following technical solutions are specifically adopted:

[0010] The present utility model provides a flame cleaning machine boot block for cleaning the surface of a billet, including a boot block body, a cooling water channel and a stepped surface provided on the boot block body;

[0011] The stepped surface is located at the working end of the shoe block body facing the surface of the billet;

[0012] A number of convex platforms are provided on the stepped surface;

[0013] The shoe block body, the stepped surface and the convex platforms are of an integral structure;

[0014] A wear-resistant layer is provided on the convex platforms.

[0015] Furthermore, the height of the convex platforms is 1 - 3 mm;

[0016] A number of the convex platforms are arranged side by side along the length extension direction of the stepped surface.

[0017] Furthermore, the thickness of the wear-resistant layer is 0.3 - 1 mm.

[0018] Furthermore, the base material of the integral structure is copper alloy;

[0019] Furthermore, the copper alloy includes CuCrZr alloy, CuCr alloy, CuZr alloy or CuAg alloy, preferably CuCrZr alloy or CuCr alloy.

[0020] Furthermore, the wear-resistant layer is an electroplated wear-resistant layer or a sprayed wear-resistant layer.

[0021] Furthermore, the electroplated coating includes a nickel-cobalt coating or a pure nickel coating;

[0022] Furthermore, the sprayed wear-resistant layer includes a supersonic sprayed coating, a plasma-sprayed alloy layer or a plasma-sprayed ceramic layer;

[0023] Furthermore, a sealing layer is provided outside the sprayed wear-resistant layer;

[0024] The sealing layer is a coating layer brushed with a high-temperature hole-sealing agent.

[0025] Furthermore, a wear-resistant layer is provided on the stepped surface.

[0026] A flame cleaning machine shoe block for cleaning the surface of a steel billet provided by the utility model is processed from a single matrix material. The shoe block body, the stepped surface and the boss are of an integrated structure, so that the overall heat conduction performance and hardness are uniform. The boss on the stepped surface replaces the friction plate separately arranged in the prior art. Since a wear-resistant layer is arranged on the boss, the wear-resistant layer is tightly combined with the boss and has strong cooling conduction ability, so that the cooling ability of the shoe block is significantly improved; the wear-resistant layer avoids the problem that the boss is corroded by flame, molten steel or steel slag, and protects the non-raised part on the stepped surface from being scratched or worn due to friction; through the wear-resistant layer, the boss and the characteristics of the integrated structure processing on the boss, the wear resistance of the shoe block is improved, the single service life is increased by at least one time, and the number of repairable times is increased by more than three times, solving the technical problems of substantial easy damage, difficult repair, high cost and short continuous operation rate cycle of the shoe block in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0028] Figure 1 FIG. 1 is a schematic diagram of the overall structure of a flame cleaning machine shoe block for cleaning the surface of a steel billet provided in Comparative Example 1 of the present utility model;

[0029] Figure 2 FIG. 2 is a schematic diagram of the overall structure of a flame cleaning machine shoe block for cleaning the surface of a steel billet provided in Embodiment 1 of the present utility model;

[0030] Figure 3 FIG. 3 is a top view structure schematic diagram of a flame cleaning machine shoe block for cleaning the surface of a steel billet provided in Embodiment 1 of the present utility model;

[0031] Figure 4 FIG. Figure 3 4 is a schematic cross-sectional structure diagram taken along the A-A direction in FIG. 3;

[0032] Figure 5 FIG. 5 is a top view structure schematic diagram of a flame cleaning machine shoe block for cleaning the surface of a steel billet provided in Embodiment 2 of the present utility model;

[0033] Figure 6 FIG. Figure 5 6 is a schematic cross-sectional structure diagram taken along the C-C direction in FIG. 5.

[0034] Reference numerals: 1 - shoe block body; 2 - stepped surface; 21 - boss; 3 - wear-resistant layer; 4 - cooling water channel; 5 - matrix; 6 - friction plate; 7 - dovetail groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Unless otherwise defined herein, scientific and technical terms used in connection with this utility model shall have the meanings commonly understood by those of ordinary skill in the art. The meanings and scopes of the terms shall be clear. However, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or extrinsic definition. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "comprising" and other forms is non-restrictive.

[0036] Unless otherwise stated, the methods and techniques of this utility model are generally carried out according to conventional methods well known in the art and as described in various general and more specific references, which are cited and discussed throughout this specification.

[0037] This utility model provides a flame cleaning machine shoe block for cleaning the surface of a steel billet, including a shoe block body 1, a cooling water channel 4 provided on the shoe block body 1, and a step surface 2;

[0038] The step surface 2 is located at the working end of the shoe block body 1 facing the surface of the steel billet;

[0039] A number of bosses 21 are provided on the step surface 2;

[0040] The shoe block body 1, the step surface 2, and the bosses 21 are of an integral structure;

[0041] A wear-resistant layer 3 is provided on the bosses 21.

[0042] The shoe block is processed from a single matrix material. The shoe block body 1, the step surface 2, and the bosses 21 are of an integral structure, making the overall thermal conductivity and hardness uniform. The bosses 21 on the step surface 2 replace the friction plates 6 separately provided in the prior art. Since the wear-resistant layer 3 is provided on the bosses 21, the wear-resistant layer 3 is tightly combined with the bosses 21 and has strong cooling conduction ability, significantly improving the cooling ability of the shoe block; the wear-resistant layer 3 avoids the problem of the bosses 21 being corroded by flames, molten steel, or steel slag, protecting the non-protruding parts on the step surface 2 from being scratched or worn due to friction; avoiding the non-protruding parts on the step surface 2 from being scratched or worn due to friction; through the wear-resistant layer 3 on the bosses 21, the bosses 21, and the characteristics of integral structure processing, the wear-resistant performance of the shoe block is improved, the single service life is increased by at least one time, and the repairable times are increased by more than three times, solving the technical problems in the prior art that the shoe block is substantially easy to damage, difficult to repair, high in cost, and short in continuous operation rate cycle.

[0043] In some specific embodiments, the height of the bosses 21 is 1 - 3 mm.

[0044] In the processing of a single matrix material, the processing height of the bosses 21 being 1 - 3 mm can have an obvious protective effect on the step surface 2.

[0045] Among them, the height of the boss 21 can be, but is not limited to, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm or 3 mm, and can also be any value between 1 and 3 mm.

[0046] In some specific embodiments, several of the bosses 21 are arranged side by side along the length extension direction of the step surface 2.

[0047] Among them, the number of the bosses 21 can be set according to specific needs.

[0048] In some specific embodiments, the thickness of the wear-resistant layer 3 is 0.3 to 1 mm.

[0049] The wear-resistant layer 3 with a thickness of 0.3 to 1 mm can not only enhance the wear resistance of the boss 21, but also, due to its limited thickness, the wear-resistant layer has good heat conduction performance, improves the cooling capacity of the cooling water channel, and reduces the decline rate of the strength and hardness of the wear-resistant layer. It is not only not easy to adhere molten steel and steel slag, but also improves the wear resistance of the wear-resistant layer.

[0050] In some specific embodiments, the matrix material of the integral structure is copper alloy. Since copper alloy has good thermal conductivity and relatively high strength, it can make the whole shoe block have relatively high hardness or strength, and has excellent heat conduction ability, making it difficult for the splashed, dripped molten steel or steel slag melted by the flame cleaning machine on the surface of the casting blank to adhere to the shoe block.

[0051] In some specific embodiments, the copper alloy includes CuCrZr alloy, CuCr alloy, CuZr alloy or CuAg alloy, and preferably CuCrZr alloy or CuCr alloy.

[0052] In some specific embodiments, the wear-resistant layer 3 is an electroplated wear-resistant layer or a sprayed wear-resistant layer.

[0053] Among them, the electroplated wear-resistant layer usually needs to be machined by cutting, and further needs to be ground and polished. The polished surface is less likely to adhere to the splashed molten steel drops and liquid slag drops, and is naturally not easy to cause friction and scratches.

[0054] The sprayed wear-resistant layer is more convenient than the electroplated wear-resistant layer, and the sprayed wear-resistant layer is usually harder and more wear-resistant than the electroplated layer.

[0055] In some specific embodiments, the electroplated coating includes a nickel-cobalt coating or a pure nickel coating.

[0056] In some specific embodiments, the sprayed wear-resistant layer includes a supersonic sprayed coating, a plasma-sprayed alloy layer or a plasma-sprayed ceramic layer.

[0057] In some specific embodiments, a sealing layer is further provided outside the sprayed wear-resistant layer.

[0058] The sealing layer can seal the microscopic pores of the wear-resistant layer 3, making the wear-resistant layer denser and less likely to adhere to the splashed molten steel or slag, and having a better protective effect on the coating.

[0059] In some specific embodiments, the sealing layer is a coating layer of high-temperature hole-sealing agent.

[0060] In some specific embodiments, a wear-resistant layer 3 is provided on the stepped surface 2 to further protect the non-protruding parts on the stepped surface from being scratched or worn due to friction, and at the same time, the overall processing is convenient and fast.

[0061] Next, the technical solutions of the present invention will be described clearly and completely in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] Embodiment 1:

[0063] Combined with Figures 2 to 4 For illustration, a flame cleaning machine shoe block for cleaning the surface of a steel billet is provided. A cooling water channel 4 is provided on the shoe block. The shoe block is processed from a single matrix material CuCrZr alloy. The shoe block body 1, the stepped surface 2 and the boss 21 are of an integral structure, having high thermal conductivity and strength. The working surface facing the steel billet surface is the stepped surface 2 with 5 bosses 21 arranged at intervals. The protruding height of the boss 21 is 2 mm, and the surface of the boss 21 facing the steel billet surface is provided with an electroplated nickel-cobalt coating as the wear-resistant layer 3. The thickness of the coating after cutting and grinding and polishing is 0.6 mm.

[0064] Embodiment 2

[0065] Combined with Figure 2 、 Figure 5 And Figure 6 For illustration, a flame cleaning machine shoe block for cleaning the surface of a steel billet is provided. A cooling water channel 4 is provided on the shoe block. The shoe block is processed from a single matrix material CuCr alloy. The shoe block body 1, the stepped surface 2 and the boss 21 are of an integral structure, having high thermal conductivity and strength. The working surface facing the steel billet surface is the stepped surface 2 with 5 bosses 21 arranged at intervals. The protruding height of the boss 21 is 1.8 mm, and the surface of the boss 21 facing the steel billet surface and the entire stepped surface 2 are provided with a supersonic spray coating as the wear-resistant layer 3. The coating thickness is 0.5 mm, and the coating is brushed, impregnated, air-dried and baked in an electric resistance furnace at 180 °C for 2.5 hours.

[0066] Comparative Example 1

[0067] Combination Figure 1 For illustration, the structure of the shoe block is formed by integrating a copper matrix 5 and a friction plate 6 through a dovetail groove 7. The copper matrix 5 is provided with a cooling water channel 4 through which cooling circulating water flows, which plays a role in cooling and protecting the shoe block or the flame burner. Among them, the friction plate 6 is made of wear-resistant alloy steel, and the friction plate 6 mainly plays a role of positioning or isolation to avoid contact between the billet and the shoe block matrix and prevent damage to the shoe block matrix.

[0068] Application Example 1

[0069] The shoe blocks provided in Example 1 and Comparative Example 1 were respectively used on a flame cleaning machine of model CM-90-8-1 to clean the surface of the billet.

[0070] After being verified by on-machine use, Example 1 was used for 65 days and was removed during the off-machine maintenance. On the wear-resistant layer 3 surfaces of the 5 bosses 21, only less than 10% of the area was worn to show copper leakage, and there were no scratches on the non-boss surfaces of the step surface 2.

[0071] However, 3 friction plates 6 in Comparative Example 1 were removed in 7 days, and the remaining 5 were removed in 21 days. The reason for removal was that most of the friction plates had been burned out and there were also many scratches on the matrix surface that were scratched into grooves; the adverse effects brought to subsequent repair were also much greater than those of this example because the grooves needed to be repaired.

[0072] Application Example 2

[0073] The shoe blocks provided in Example 2 and Comparative Example 1 were respectively used on a flame cleaning machine of model CM-90-8-1 to clean the surface of the billet.

[0074] After being verified by on-machine use, Example 2 was used for 63 days and was removed during the off-machine maintenance. On the wear-resistant layer 3 surfaces of the 5 bosses 21, only less than 15% of the end area had signs of impact and chipping, and there were no scratches on the non-boss surfaces of the step surface 2.

[0075] However, 2 friction plates 6 in Comparative Example 1 were removed in 8 days, and the remaining 5 were removed in 22 days. The reason for removal was that most of the friction plates had been burned out and there were also many scratches on the matrix surface that were scratched into grooves; the adverse effects brought to subsequent repair were also much greater than those of this example because the grooves needed to be repaired.

[0076] Therefore, although the friction plate is not separately provided in the present utility model, a stepped surface 2 provided with a boss 21 is provided in the structure, and a wear-resistant layer with a thickness of 0.3 to 1 mm is provided on the stepped surface 2. The wear-resistant layer is not only wear-resistant, but also has good cooling capacity transmission due to the limited thickness of the wear-resistant layer, slowing down the decline rate of its strength and hardness. This not only makes the wear-resistant layer not easily adhere to molten steel and steel slag, but also makes the wear-resistant layer more wear-resistant. The average service life is at least doubled compared with the comparative example. Moreover, there are basically no scratches or wear on the large non-raised surface of the stepped surface 2. Not only is the single service life at least doubled, but also the number of repairable times can be increased by more than three times, thus completely solving the series of problems brought by the originally provided friction plate and greatly reducing the use cost.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A flame cleaning machine shoe block for cleaning the surface of a steel billet, characterized in that, It includes a shoe block body (1), a cooling water channel (4) and a stepped surface (2) provided on the shoe block body (1); The stepped surface (2) is located at the working end of the shoe block body (1) facing the surface of the steel billet; A number of bosses (21) are provided on the stepped surface (2); The shoe block body (1), the stepped surface (2) and the bosses (21) are of an integral structure; A wear-resistant layer (3) is provided on the bosses (21).

2. The boot block of the flame cleaning machine according to claim 1, characterized in that, The height of the bosses (21) is 1 - 3 mm; A number of the bosses (21) are arranged side by side along the length extension direction of the stepped surface (2).

3. The boot block of the flame cleaning machine according to claim 1, characterized in that, The thickness of the wear-resistant layer (3) is 0.3 - 1 mm.

4. The flame cleaning machine shoe block according to claim 1, wherein, The matrix material of the integral structure is copper alloy.

5. The flame cleaning machine shoe block according to claim 4, characterized in that, The copper alloy includes CuCrZr alloy, CuCr alloy, CuZr alloy or CuAg alloy.

6. The boot block of the flame cleaning machine according to claim 1, characterized in that, The wear-resistant layer (3) is an electroplated wear-resistant layer or a sprayed wear-resistant layer.

7. The boot block of the flame cleaning machine according to claim 6, characterized in that, The electroplated wear-resistant layer includes a nickel-cobalt coating or a pure nickel coating.

8. The boot block of the flame cleaning machine according to claim 6, characterized in that, The sprayed wear-resistant layer includes a supersonic sprayed coating, a plasma-sprayed alloy layer or a plasma-sprayed ceramic layer.

9. The boot block of the flame cleaning machine according to claim 8, characterized in that, A sealing layer is further provided outside the sprayed wear-resistant layer; The sealing layer is a high-temperature sealing agent coating layer.

10. The boot block of the flame cleaning machine according to any one of claims 1 to 9, characterized in that, A wear-resistant layer (3) is provided on the stepped surface (2).

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