Strip steel continuous electroplating edge cover and system

Abstract

The invention discloses a strip steel continuous electroplating edge cover, an inner cavity of the strip steel continuous electroplating edge cover comprises a rectangular first part with a rectangular cross section and a trapezoidal second part connected with the rectangular first part, the cross section of the trapezoidal second part is trapezoidal, and the rectangular first part is closer to strip steel than the trapezoidal second part. The invention further discloses a strip steel continuous electroplating system which comprises an anode plate, an electroplating bath and the strip steel continuous electroplating edge cover, and the strip steel is arranged in the electroplating bath. According to the strip steel continuous electroplating edge cover and the system thereof, the thickness difference of the plating layer of the electroplating strip steel in the plate width direction can be reduced, the metal consumption of the plating layer is reduced, the weldability of the edge of a wide electroplating steel plate is improved, and good economic benefits and popularization prospects are achieved.

Description

Technical Field

[0001] The present invention relates to a plating device and system, and particularly to a plating edge cover and system. Background Art

[0002] In a plating production line, compared with the middle part of the strip steel, the surface curvature of the strip steel edge is larger, which will produce an edge effect, resulting in a larger current density corresponding to the strip steel edge. Therefore, the coating deposited on the strip steel edge is thicker than that in the middle part of the strip steel, which is likely to cause poor coiling and poor welding.

[0003] Using an insoluble anode can keep the distance between the anode and the strip steel constant during electroplating, improving the uniformity of the coating distribution on the electroplated steel sheet. For an electroplating unit using an insoluble anode, in order to overcome the thickening of the coating at the edge, a strip steel edge cover is generally used to improve the situation of edge thickening.

[0004] The edge cover of the electroplating unit is generally a vertical edge cover, and the material is generally made of fiberglass, which is vertically installed between two anode plates in the electroplating tank. The main function of the edge cover is to cover the edge of the strip steel running at high speed, shield part of the current, prevent the accumulation and thickening of the coating on the strip steel edge, and ensure the uniformity of the coating on the surface of the electroplated steel sheet.

[0005] In actual production, splash phenomenon will occur during the welding of electroplated steel sheets. After detection, the coating weight at the strip steel edge is about 1.5 - 5 times that in the middle. In addition, the edge cover often rubs against the strip steel. Especially for thin materials with a thickness of 0.10 - 0.80 mm, the rubbing of the edge cover against the strip steel will restrict the unit speed and production capacity. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a strip steel continuous electroplating edge cover, which can solve the problem of thickening of the coating edge produced in actual industrial production and improve the uniformity of the coating thickness in the width direction of the strip steel. At the same time, the electroplated steel sheet produced by using the strip steel continuous electroplating edge cover of the present invention has uniform coating thickness and excellent surface quality.

[0007] To achieve the above purpose, the present invention provides a strip steel continuous electroplating edge cover, the internal cavity of which includes a rectangular first part with a rectangular cross-section and a trapezoidal second part connected to the rectangular first part, wherein the cross-section of the trapezoidal second part is trapezoidal, and the rectangular first part is closer to the strip steel than the trapezoidal second part.

[0008] Further, in the strip steel continuous electroplating edge cover of the present invention, the upper bottom edge of the trapezoidal second part is shorter than its lower bottom edge, and the lower bottom edge is closer to the strip steel than the upper bottom edge.

[0009] Furthermore, in the strip continuous electroplating edge cover of the present invention, the lower base of the trapezoidal second part is shorter than the long side of the rectangular first part.

[0010] In the present invention, when the lower base of the trapezoidal second part is controlled to be less than the long side of the rectangular first part, the flow condition of the electroplating solution can be improved, and the power line shielding effect can be increased.

[0011] Furthermore, in the strip continuous electroplating edge cover of the present invention, the dimension range of the long side α of the rectangular first part is 25 - 50 mm.

[0012] In the present invention, in order to avoid scratching the strip, the dimension of the long side α of the rectangular first part can be controlled to be 25 - 50 mm.

[0013] Furthermore, in the strip continuous electroplating edge cover of the present invention, the dimension of the height l of the trapezoidal second part is 5 - 15 mm.

[0014] Furthermore, in the strip continuous electroplating edge cover of the present invention, the dimension of the lower base w of the trapezoidal second part is 10 - 30 mm.

[0015] Furthermore, in the strip continuous electroplating edge cover of the present invention, the upper base w of the trapezoidal second part 2 has a dimension of 5 - 30 mm.

[0016] Furthermore, in the strip continuous electroplating edge cover of the present invention, the distance w between the wide side of the rectangular first part and the outer side wall of the strip continuous electroplating edge cover 1 is 5 - 15 mm.

[0017] Furthermore, in the strip continuous electroplating edge cover of the present invention, the wide side l of the rectangular first part 1 has a dimension of 5 - 10 mm.

[0018] Another object of the present invention is to provide a strip continuous electroplating system, which, based on the electroplating production electric field distribution mechanism, solves the problems of thickening of the electroplated strip edge and poor edge welding existing in the currently commonly used edge covers, controls the thickening of the electroplated strip edge within a certain range, and improves the surface quality of the plated product.

[0019] To achieve the above object, the present invention also provides a strip continuous electroplating system, which includes an anode plate, an electroplating tank, a strip is arranged in the electroplating tank, and also includes the above-mentioned strip continuous electroplating edge cover.

[0020] Furthermore, in the strip continuous electroplating system of the present invention, the distance γ between the outer side wall of the strip continuous electroplating edge cover and the anode plate is 5 - 10 mm.

[0021] In the present invention, the distance γ between the outer sidewall of the strip continuous electroplating edge cover and the anode plate is controlled to determine the optimal distance between the edge cover and the anode plate.

[0022] Furthermore, in the strip continuous electroplating system of the present invention, the overlapping distance β between the strip continuous electroplating edge cover and the strip is 1 - 9 mm.

[0023] In the present invention, by controlling β, the effective width of the strip shielded by the edge cover can be controlled.

[0024] The strip continuous electroplating system of the present invention has the following advantages and

[0025] beneficial effects compared with the prior art:

[0026] In the strip continuous electroplating edge cover and system of the present invention, not only the consumption of the plating metal is reduced, the weldability of the wide-width electroplated steel strip edge is improved, and the splash at the strip weld is avoided. At the same time, the electroplated steel strip produced by using the strip continuous electroplating edge cover of the present invention has a uniform coating thickness, excellent surface quality, and good economic benefits and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematically shows a structural diagram of an existing strip edge cover.

[0028] Figure 2 Schematically shows a structural diagram of the strip continuous electroplating edge cover of the present invention in one embodiment.

[0029] Figure 3 Shows the influence of the change of β on the coating thickness in the strip continuous electroplating edge cover and system of the present invention.

[0030] Figure 4 Shows a comparison diagram of the shielding effects between the strip continuous electroplating edge cover and system of the present invention and a U-shaped strip edge cover and its system. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The following will further explain and illustrate a strip continuous electroplating edge cover and system of the present invention in conjunction with specific embodiments and the accompanying drawings of the specification. However, this explanation and illustration shall not unduly limit the technical solution of the present invention.

[0032] Since the material of the strip continuous electroplating edge cover can be a fiberglass insulator, during production, the electroplating edge cover can be placed on both sides of the strip to shield a part of the power lines, thereby preventing the thickening of the coating caused by the concentration of power lines at the strip edge due to the tip effect.

[0033] The present invention discovers through research that the structure of the edge cover has a great influence on the distribution of the electric field of electroplated steel sheets.

[0034] Figure 1 Schematically shows a U-shaped edge cover commonly used in the prior art.

[0035] As Figure 1 shown, the U-shaped strip edge cover 5 and the anode plates 6 on both sides of the U-shaped strip edge cover 5 are both arranged in the electroplating tank (not shown in the figure), and the U-shaped strip edge cover 5 covers the edge of the strip 7. Figure 1 In the figure, the label "α" represents the distance between the inner side walls of the U-shaped edge cover, "β" represents the overlapping distance between the edge cover and the strip 7, and "γ" represents the distance between the edge cover 5 and the anode plate 6.

[0036] The inventor discovers through research that although as α, β, and γ decrease, the current density in the end edge and its adjacent area of the strip decreases, and the shielding effect of the edge cover increases. However, the shielding effect of this edge cover is not very good.

[0037] Based on this, an embodiment of the present invention proposes an edge cover with a completely new structure, which can improve the current density distribution in the end edge and its adjacent area of the strip to achieve the best power line shielding effect.

[0038] Figure 2 Schematically shows the structural schematic diagram of the strip continuous electroplating edge cover described in the present invention.

[0039] As Figure 2 shown, the strip continuous electroplating edge cover 1 and the anode plate 6 described in the present invention are arranged in the electroplating tank 4, and the strip continuous electroplating edge cover 1 covers the edge of the strip 7.

[0040] The internal cavity of the strip continuous electroplating edge cover 1 includes a rectangular first part with a rectangular cross-section and a trapezoidal second part connected to the rectangular first part, wherein the cross-section of the trapezoidal second part is trapezoidal, and the rectangular first part is closer to the strip 7 than the trapezoidal second part.

[0041] In addition, the inventor further discovers through research that by controlling the structural dimensions of the strip continuous electroplating edge cover 1 described in the present invention, the shielding effect can be further improved.

[0042] According to the strip continuous electroplating edge cover described in the present invention, its structural dimensions and the influencing factors of the electroplated steel sheet electric field distribution obtain the following formula:

[0043]

[0044] Where: α is the length of the long side of the rectangular first part, l is the height of the trapezoidal second part, w is the lower bottom side of the trapezoidal second part, w 2is the upper base of the second trapezoidal part, w 1 is the distance between the wide side of the first rectangular part and the outer side wall of the strip continuous electroplating edge cover, l 1 is the wide side of the first rectangular part, γ is the distance between the outer side wall of the strip continuous electroplating edge cover and the anode plate, and β is the overlapping distance between the strip continuous electroplating edge cover and the strip 7.

[0045] It can be obtained from the formula that as α, β, γ, w 2 , w decrease, the current density at the strip end edge and its nearby area decreases, and the shielding effect increases; as w 1 , l, l 1 increase, the current density at the strip end edge and its nearby area decreases, and the shielding effect increases; the present invention further optimizes the overall shielding effect by controlling α, β, γ,,, l, w, l 1 , w 1 , w 2 8 parameters.

[0046] That is, by controlling α, l 1 , w 1 the optimal structure of the first rectangular part can be optimized; by controlling l, w, w 2 the optimal structure of the second trapezoidal part can be optimized.

[0047] Based on this, in some preferred embodiments of the present invention, preferred control ranges of the above parameters are provided, where:

[0048] The size range of the long side α of the first rectangular part is 25 - 50 mm; the height l of the second trapezoidal part is 5 - 15 mm; the lower base w of the second trapezoidal part is 10 - 30 mm; the upper base w of the second trapezoidal part 2 is 5 - 30 mm; the distance w between the wide side of the first rectangular part and the outer side wall of the strip continuous electroplating edge cover 1 is 5 - 15 mm; the wide side l of the first rectangular part 1 has a size of 5 - 10 mm.

[0049] Examples 1 - 5

[0050] To embody the preferred embodiments of this case, the preferred Examples 1 - 5 of the present invention all use an insoluble anode plate with a width of 1400 mm, a thickness of 25 mm, and a height of 1700 mm; a strip with a width of 923 mm and a thickness of 0.19 mm; an electroplating tank with a width of 1700 mm, a thickness of 348 mm, and a height of 2400 mm. The structural characteristic parameters of the strip continuous electroplating edge cover are shown in Table 1.

[0051] Table 1.

[0052] Number α (mm) β (mm) γ (mm) l (mm) w (mm) <![CDATA[l 1 (mm)]]> <![CDATA[w 1 (mm)]]> <![CDATA[w 2 (mm)]]> Example 1 25 1 5 5 10 5 5 5 Example 2 30 2 6 7 15 6 8 15 Example 3 35 5 7 10 20 7 10 20 Example 4 40 7 9 12 25 9 12 25 Example 5 50 9 10 15 30 10 15 30

[0053] In order to demonstrate the implementation effects of the preferred embodiments 1-5, Table 2 lists the thickness differences of electroplated steel strips produced by using the strip continuous electroplating edge covers and systems of the preferred embodiments 1-5 of the present invention.

[0054] Table 2.

[0055]

[0056] It can be seen from Table 2 that by adopting the continuous electroplating edge cover and system of the preferred embodiments 1-5 of the present invention, the edge thickening of the electroplated steel strip can be controlled within a certain range, thereby improving the surface quality of the plated product.

[0057] Figure 3 The effect of the change of β on the coating thickness in the edge cover and system for continuous electroplating of steel strip according to the present invention is shown.

[0058] from Figure 3 It can be seen that when the overlapping distance β between the continuous electroplating edge cover and the strip steel is 2 mm (the distance blocked by the edge cover) within the preferred range of 1 to 9 mm of the present invention, compared with other values ​​of β, the difference in coating thickness along the width direction of the electroplated strip steel is smaller, which indicates that its shielding effect is better, which not only reduces the consumption of coating metal, but also improves the uniformity of coating thickness of the electroplated steel plate, thereby improving the weldability of the edge of the wide electroplated steel plate.

[0059] Figure 4 A comparison diagram of the shielding effects of the continuous electroplating edge cover of the steel strip according to Example 1 of the present invention and the existing U-shaped edge cover of the steel strip is shown.

[0060] like Figure 4 It can be seen that compared with the existing U-shaped edge cover, the continuous electroplating edge cover of the strip steel adopted by the present invention can make the difference of the coating thickness along the width direction of the electroplated strip steel smaller, which indicates that the shielding effect is better. This not only reduces the consumption of coating metal, but also improves the uniformity of the coating thickness of the electroplated steel plate, thereby improving the weldability of the edge of the wide electroplated steel plate.

[0061] It should be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with by those skilled in the art from the contents disclosed in the present invention, and all should belong to the protection scope of the present invention.

Claims

1. A continuous electroplating edge cover for strip steel, Characterized in that, Its internal cavity includes a rectangular first part with a rectangular cross-section and a trapezoidal second part connected to the rectangular first part. The cross-section of the trapezoidal second part is trapezoidal, and the rectangular first part is closer to the strip steel than the trapezoidal second part.

2. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The upper base of the trapezoidal second part is shorter than its lower base, and the lower base is closer to the strip steel than the upper base.

3. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The lower base of the trapezoidal second part is shorter than the long side of the rectangular first part.

4. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The dimension α of the long side of the rectangular first part ranges from 25 to 50 mm.

5. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The dimension l of the height of the trapezoidal second part is 5 to 15 mm.

6. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The dimension w of the lower base of the trapezoidal second part is 10 to 30 mm.

7. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The upper base w of the trapezoidal second part 2 has a dimension of 5 to 30 mm.

8. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The distance w between the wide side of the rectangular first part and the outer side wall of the strip continuous electroplating edge cover 1 is 5 to 15 mm.

9. The continuous electroplating edge cover for strip steel according to claim 1, Characterized in that, The width side l of the first rectangular part 1 has a dimension of 5 to 10 mm.

10. A continuous electroplating system for strip steel, which includes an anode plate and an electroplating tank, and the strip steel is arranged in the electroplating tank, Characterized in that, It further includes the continuous electroplating edge cover for strip steel according to any one of claims 1-9.

11. The continuous electroplating system for strip steel according to claim 10, Characterized in that, The distance γ between the outer side wall of the continuous electroplating edge cover for strip steel and the anode plate is 5 to 10 mm.

12. The continuous electroplating system for strip steel according to claim 10, Characterized in that, The overlapping distance β between the continuous electroplating edge cover for strip steel and the strip steel is 1 to 9 mm.

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