Device and method for controlling thickness of coating on edge of plate

Abstract

The present invention provides a device and method for controlling the thickness of the coating on the edge of a plate. The control device includes a support member, at least two heating components and a temperature measuring component. The support member is formed with a through groove suitable for the plate to pass through; two heating components are connected to the support member, and the two heating components are arranged on both sides of the plate; the temperature measuring component is connected to the support member, and the temperature measuring component includes a number of temperature measuring sensors arranged around the plate; wherein the heating component includes a driving member, a heating member and an air knife baffle, the driving member is connected to the support member, the heating member is connected to the air knife baffle, the air knife baffle is connected to the driving member, and the heating member and the air knife baffle are configured to be driven by the driving member to approach or move away from the edge of the plate, to match the real-time switching of products of various width specifications during continuous production, so as to compensate for the heat of the edge of the plate.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous hot-dip plating, and in particular to a device and method for controlling the thickness of a coating on an edge of a plate. Background Art

[0002] Hot-dip galvanized strip edge defects (edge ​​thickening) occur when the coating thickness at the edge of the strip is significantly higher than that in the center. In severe cases, the edge thickness can be more than twice the center thickness. This edge thickness abnormality can severely impact coiling, causing the diameter of the coiled steel edge to be significantly higher than the center diameter, resulting in edge warping.

[0003] Chinese patent document CN204417574U discloses a device for controlling the coating of galvanized steel strip, comprising a support, an air knife baffle assembly, and a heating device. The air knife baffle assembly and the heating device are mounted on the support. Two air knife baffles are symmetrically located on the left and right sides of the steel strip and are coplanar with the steel strip. Two heating devices are also symmetrically located on the left and right sides of the steel strip and located above the air knife baffles. The heating area of ​​the heating devices covers the edge of the steel strip. In this prior art, a heating device is installed above the air knife baffles to compensate for the heat of the steel strip edge, slowing the cooling rate of the coating at the edge of the steel strip and thus preventing the coating from becoming too thick at the edge. However, the air knife purge process removes a large amount of heat from the steel strip edge. The heat compensation performed on the steel strip edge after the air knife purge is completed has limited effect on the coating at the edge of the steel strip. After the steel strip passes through the air knife, even if the thick edge defect caused by the solidification of the plating solution after the strip passes through the air knife and returns to a molten state due to heat compensation, there is no additional momentum to scrape it off, and the excess plating solution remains on the surface of the steel strip. Chinese patent document CN215209592U discloses a temperature-compensated auxiliary slag removal air knife, which incorporates a heated auxiliary air knife above the main air knife. This prior art utilizes a secondary air knife to scrape off excess plating solution after partially solidifying the plating solution and returning it to a molten state, thereby controlling the coating thickness at the strip edge. However, the additional air knife device is costly, complicates the overall air knife structure, and makes control more complex. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the existing technology has a complex structure, high production cost, and more complicated control.

[0005] To this end, the present invention provides a device for controlling the thickness of a coating on the edge of a plate, comprising:

[0006] A support member having a through slot formed thereon for the plate to pass through;

[0007] At least two heating components are connected to the support member, and the two heating components are respectively arranged on both sides of the plate;

[0008] A temperature measuring component is connected to the support member, and the temperature measuring component includes a plurality of temperature measuring sensors arranged around the plate;

[0009] In which, the heating component includes a driving member, a heating member and an air knife baffle, the driving member is connected to the supporting member, the heating member is connected to the air knife baffle, the air knife baffle is connected to the driving member, and the heating member and the air knife baffle are configured to be driven by the driving member to approach or move away from the edge of the plate to compensate for the heat at the edge of the plate.

[0010] Optionally, along the length direction of the plate, the side surface of the air knife baffle is in an "I-shape", and heating elements are provided at the upper and lower ends of the I-shaped air knife baffle.

[0011] Optionally, the upper and lower ends of the I-shaped air knife baffle extend toward the edge of the plate, and an air knife assembly is arranged in the space between the upper and lower ends of the air knife baffle.

[0012] Optionally, the heating component further includes:

[0013] A fixed sleeve, fixedly connected to the support member;

[0014] A movable sleeve, one end of which is movably connected to the support member, and the other end of which is connected to the air knife baffle;

[0015] Wherein, the driving member is arranged between the fixed sleeve and the movable sleeve to drive the movable sleeve to move relative to the supporting member, so that the air knife baffle is close to or away from the edge of the plate.

[0016] Optionally, the heating assembly further comprises a telescopic member connected between the fixed sleeve and the movable sleeve, and the telescopic member is configured to be driven by the driving member to extend or contract to control the movement of the movable sleeve relative to the supporting member.

[0017] Optionally, the heating assembly further includes a power controller, which is connected to the heating element.

[0018] Optionally, the two heating components are symmetrically arranged along the center line of the plate.

[0019] Optionally, an edge temperature sensor is provided on the movable sleeve to drive the edge temperature sensor to approach or move away from the edge of the plate.

[0020] Optionally, the edge temperature sensor is U-shaped, and the edge of the plate is arranged in an opening of the edge temperature sensor to measure the temperature of three sides of the edge of the plate.

[0021] Optionally, a plurality of middle temperature sensors are provided in the through groove portion of the support member, and the middle temperature sensors are arranged on opposite sides of the plate, and the middle temperature sensors are level with the edge temperature sensors.

[0022] A method for controlling the thickness of a coating on the edge of a plate, used in the device for controlling the thickness of a coating on the edge of a plate, the method comprising:

[0023] Introduce the parameter P, P = k*T*v, where T is the plate thickness in mm, v is the plate running speed in m / min, and k is the coating thickness compensation coefficient.

[0024] Optionally, when the coating specification is 0-80g / m 2 When k=1;

[0025] When the coating specification is 80-160g / m 2 When k = 0.95;

[0026] When the coating specification is 160-240g / m 2 When k = 0.9;

[0027] When the coating specification is 240-320g / m 2 When k = 0.8;

[0028] When the coating specification is greater than 320g / m 2 When k=0.7.

[0029] The device and method for controlling the thickness of the coating on the edge of a plate provided by the present invention have the following advantages:

[0030] 1. The present invention provides a device for controlling the thickness of the coating on the edge of a plate, comprising a support member, at least two heating components and a temperature measuring component, wherein the support member is formed with a through groove suitable for the plate to pass through; two heating components are connected to the support member, and the two heating components are arranged on both sides of the plate; the temperature measuring component is connected to the support member, and the temperature measuring component includes a number of temperature measuring sensors arranged around the plate; wherein the heating component includes a driving member, a heating member and an air knife baffle, the driving member is connected to the support member, the heating member is connected to the air knife baffle, the air knife baffle is connected to the driving member, and the heating member and the air knife baffle are configured to be driven by the driving member to approach or move away from the edge of the plate.

[0031] This structure of the plate edge coating thickness control device is provided with heating components on both sides of the plate. The heating components and the air knife baffle are configured to be driven by the driving component to move closer to or further away from the plate edge, matching the real-time switching of products of various width specifications during continuous production. The heating components heat the air knife baffle, allowing it to directly compensate for the heat of the plate edge in the air knife blowing area. This can minimize heat loss at the plate edge and reduce the difference in plating solution temperature between the plate edge and the middle, thus avoiding the phenomenon of thick edge formation caused by partial solidification of the plating solution due to a large temperature drop at the edge of the plate. At the same time, as the temperature of the plate edge increases, the surface tension of the plating solution decreases, and its tendency to shrink inward is reduced. The local high points of the plating caused by the surface tension of the liquid in the plate edge area are improved, increasing the uniformity of the edge plating, thereby reducing the occurrence of thick edge defects.

[0032] 2. The present invention provides a method for controlling the thickness of the coating on the edge of a plate. By introducing the parameter P, the three variable parameters that affect the thickness of the coating on the edge of the plate, namely, the product coating specification, thickness specification and the production plate running speed, are comprehensively quantified, and the power of the heating element on the air knife baffle is adjusted according to the P value to reduce the temperature difference between the middle and edge of the plate, thereby realizing the control of the coating thickness on the edge of the plate under various specifications and process belt speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 This is a front view of a plate edge coating thickness control device provided in an embodiment of the present invention;

[0035] Figure 2 A side view of a plate edge coating thickness control device provided in an embodiment of the present invention;

[0036] Figure 3 A top view of a plate edge coating thickness control device provided in an embodiment of the present invention;

[0037] Description of reference numerals:

[0038] 1- support member;

[0039] 21-driving element; 22-heating element; 23-air knife baffle; 24-fixed sleeve; 25-movable sleeve; 26-telescopic element; 27-power controller;

[0040] 31-edge temperature sensor; 32-middle temperature sensor;

[0041] 4-Air knife assembly;

[0042] 5- Plate. DETAILED DESCRIPTION

[0043] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0044] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0045] Example 1

[0046] This embodiment provides a device for controlling the thickness of a coating on the edge of a plate, comprising a support member 1, two heating components, and a temperature measuring component.

[0047] In this embodiment, if Figure 3 As shown, a through slot is formed in the middle of the support member 1 for the plate 5 to pass through, and the two ends of the support member 1 are columnar straight rods. In this embodiment, the plate 5 is a strip steel.

[0048] In this embodiment, if Figure 1 and Figure 3 As shown, the heating assembly includes a driving member 21, a heating member 22, an air knife baffle 23, a fixed sleeve 24, a movable sleeve 25, a telescopic member 26 and a power controller 27, wherein the two heating assemblies are symmetrically arranged along the center line of the plate 5. Figure 1 The heating component on the right side of the figure is used as an example.

[0049] In this embodiment, if Figure 1As shown, the fixed sleeve 24 is fixedly connected to the right end of the support member 1 via a flange, and the movable sleeve 25 is sleeved on the right cylindrical straight rod of the support member 1 and can slide relative to the right side of the support member 1 in the area between the through groove and the fixed sleeve 24. The fixed end of the driving member 21 is fixedly connected to the movable sleeve 25, and the driving end of the driving member 21 is connected to the telescopic member 26. The other end of the telescopic member 26 is fixedly connected to the fixed sleeve 24. When the driving member 21 is started, the driving member 21 can drive the telescopic member 26 to extend and retract, thereby driving the movable sleeve 25 to slide on the right surface of the support member 1. Among them, the driving member 21 adopts a control motor, and the telescopic member 26 adopts a telescopic rod in the prior art. The connection method and movement method between the two are all prior art, and their principles are not elaborated here.

[0050] In this embodiment, still refer to Figure 1 The air knife baffle 23 is fixedly connected to the movable sleeve 25 and the fixed end of the driving member 21 through a connecting rod. An edge temperature sensor 31 in the temperature measuring assembly is provided on the upper side of the air knife baffle 23. The edge temperature sensor 31 is also fixedly connected to the movable sleeve 25 through a connecting rod, so that the edge temperature sensor 31 and the air knife baffle 23 can move together with the movable sleeve 25 to approach or move away from the edge of the plate 5, matching the real-time switching of products of various width specifications during continuous production.

[0051] Furthermore, in this embodiment, Figure 2 As shown, the air knife baffle 23 has an I-shaped profile along the length of the sheet 5. Heating elements 22 are mounted on the upper and lower sides of the air knife baffle 23. A power controller 27 is installed next to each heating element 22 to control the power of the heating element 22. Both connections are welded. The upper and lower ends of the I-shaped air knife baffle 23 extend toward the edge of the sheet 5. The air knife assembly 4 is located in the space between the upper and lower ends of the air knife baffle 23. The air knife baffle 23 is wide at the upper and lower ends and narrow in the middle. The thickness of the middle portion is slightly greater than the thickness of the sheet, and the height is slightly higher than the air knife assembly 4. This serves to extend the strip and improve the airflow field at the strip's edge. The wider upper and lower ends increase the heat radiation area of ​​the air knife baffle 23 to the strip's edge, enhancing the heating effect of the air knife baffle 23 on the strip's edge.

[0052] In this embodiment, if Figure 1 and Figure 3 As shown, the edge temperature sensor 31 is in a "U-shape" with three temperature probes provided inside thereof for measuring the temperature of the upper surface, lower surface and edge of the edge area of ​​the plate 5 to improve the temperature measurement accuracy.

[0053] In this embodiment, the temperature measuring component also includes two middle temperature sensors 32, which are fixed to the through groove portion of the support member 1 through a connecting rod. The two middle temperature sensors 32 are arranged on opposite sides of the plate 5, so that the two middle temperature sensors 32 and the two edge temperature sensors 31 measure the temperature around the plate 5, and the middle temperature sensor 32 is level with the edge temperature sensor 31. By comparing the difference between the edge temperature sensor 31 and the middle temperature sensor 32, the power controller 27 is adjusted to perform heat compensation on the edge area of ​​the plate 5, reduce the temperature difference between the edge temperature sensor 31 and the middle temperature sensor 32, and realize the edge thickness control of the plate 5.

[0054] Currently, since air knife medium purging is the primary source of heat loss at the strip edges, this embodiment utilizes a heating element 22 to heat the air knife baffle 23, allowing it to compensate for heat loss at the strip edges directly in the air knife purging area. This minimizes heat loss at the strip edges and reduces the temperature difference between the plating solution at the strip edges and the center. This prevents the plating solution from partially solidifying due to a significant temperature drop at the strip edges, thus forming thick edges. Simultaneously, as the strip edge temperature increases, the surface tension of the plating solution decreases, reducing its tendency to shrink inward. This improves the localized high points of the plating at the strip edges caused by the liquid surface tension, improves the uniformity of the plating at the strip edges, and thus reduces the occurrence of thick edge defects.

[0055] In this embodiment, the air knife baffle 23 is connected to the fixed ends of the support member 1 and the driver 21 using flanges. Because the hot-dip galvanizing process involves high temperatures (above 500°C) and complex composition (evaporation of plating bath vapor), the harsh operating environment exacerbates the risk of weld corrosion and aging under conventional welding processes. Using flange connections effectively reduces corrosion and aging at the joints, improving the overall safety and stability of the heating assembly.

[0056] When the plate edge coating thickness control device provided in this embodiment is used, the size specifications and installation positions of some pipeline equipment of the heating component are related to the width specification w of the hot-dip production line product (plate 5), which is expressed as a≤w≤b, and the unit is mm.

[0057] Taking the right heating assembly as an example, a two-dimensional xy coordinate axis is established with support 1 as the horizontal coordinate and the center of plate 5 as the zero point. The edge coordinate of plate 5 is x = X (a / 2 ≤ X ≤ b / 2), the diameter of support 1 is 30 mm, and the coordinate of the right edge of the through slot of support 1 is (b / 2 + 35, 0). The left end of the movable sleeve 25 moves to (b / 2 + 40 + (Xa / 2), 0), and the left end of the fixed sleeve 24 is installed at (b / 2 + (ba) / 2 + 200, 0). The maximum extension of the telescopic member 26 is (ba) / 2. Due to the switching of product specifications, the movable sleeve 25, the air knife baffle 23, and the edge temperature sensor 31 move with the movement of the telescopic member 26. The coordinate of the upper left corner of the air knife baffle 23 is always (X + 6, -400), and the coordinate of the edge probe of the edge temperature sensor 31 is always (X + 3, -380). The length of the air knife baffle 23 is (ba) / 2+100, the height is H+200 (where H is the height of the air knife assembly 4), the height of the middle narrow area is H+40, the width is 8mm, and the height of the upper and lower wide areas is 80mm and the width is 50mm.

[0058] The following example illustrates the use of the plate edge coating thickness control device provided in this embodiment:

[0059] When the width range of the production line products is 900-1200mm and the height of the air knife assembly 4 is 20mm, the installation position of the fixed sleeve 24 is 850mm away from the center of the plate 5, the extreme position of the left part of the movable sleeve 25 close to the plate 5 is 640mm away from the center of the plate 5, the maximum telescopic amount of the telescopic part 26 is 160mm, the length of the air knife baffle 23 is 250mm, the height is 220mm, the height of the middle narrow area is 60mm, and it is located 400mm below the support part 1. The edge probe of the edge temperature sensor 31 is 3mm away from the edge of the plate 5 and is located 20mm above the air knife baffle 23. When the product specification is 1200mm, the driving part 21 controls the telescopic part 26 to drive the movable sleeve 25 to move outward along the support part 1 to a distance of 790mm from the center of the plate 5, so that the edge of the air knife baffle 23 is 606mm away from the center of the plate 5 and 6mm away from the edge of the plate 5, and the inward telescopic amount of the telescopic part 26 is 0; when the product width specification is switched to 900mm, the driving part 21 is controlled to control the telescopic part 26 to drive the movable sleeve 25 to move inward along the support part 1 to the limit, 640mm away from the center of the plate 5, so that the edge of the air knife baffle 23 is 456mm away from the center of the plate 5 and 6mm away from the edge of the plate 5, and the telescopic part 26 is telescopic inward by 150mm.

[0060] Example 2

[0061] This embodiment provides a method for controlling the thickness of the coating on the edge of a plate, using the device for controlling the thickness of the coating on the edge of a plate provided in Example 1, and taking a hot-dip aluminum-zinc plate production line as an example.

[0062] During the production of products with the same coating specifications, the parameter P is introduced based on the thickness specifications of the galvanized product (sheet 5) and the actual process parameters during production. P = T * v, where T is the target product (sheet 5) thickness in mm, and v is the sheet 5's running speed in m / min. From this formula, it can be deduced that P represents the area of ​​the sheet 5's side surface that passes through the air knife per minute, which can be considered the heat exchange area between the gas medium and the sheet 5's edge during the air knife blowing process. In this embodiment, sheet 5 is hot-dip galvanized steel strip.

[0063] On the other hand, according to the heat conduction formula: Q = m*△t*F, where m is the comprehensive heat transfer coefficient, the unit is w / (℃*m 2 ), Q is the heat conduction, unit is w, △t is the temperature difference of the object, unit is ℃, F is the area of ​​the heat exchange surface, unit is m 2 From the formula, it can be deduced that under the same environment with a certain heat exchange amount (same Q, same m), the smaller the heat exchange area, the greater the temperature difference.

[0064] In the continuous production process of galvanizing, we can deduce by analogy that during the process of heat loss at the edge of the plating solution caused by the air knife blowing the plating solution, the cooling capacity of the air knife medium remains unchanged, that is, the total heat exchange volume remains unchanged. The smaller the heat exchange area at the edge of the strip, the greater the temperature difference at the edge of the strip. In other words, the smaller the parameter P, the greater the temperature drop at the edge of the strip. Therefore, the parameter P directly affects the edge temperature control of the hot-dip galvanized sheet, and thus has guiding significance for controlling the coating thickness at the edge of the hot-dip galvanized sheet.

[0065] Furthermore, the coating specification also influences the thickness of the coating on the strip edges. For the same strip thickness, the thicker the coating, the greater the risk of excessive coating thickness at the edges, which can lead to curling and edge ripples during coiling. Therefore, a coating thickness compensation factor k (0 < k ≤ 1) is introduced, where P = k * T * v.

[0066] Parameter P is the product of the coating thickness compensation coefficient, the target product thickness and the strip running speed, that is, P = k*T*v, where k is the coating thickness compensation coefficient, which is related to the coating thickness specification, T is the target product thickness in mm, and v is the strip running speed in m / min.

[0067] When the coating specification is 0-80g / m 2 When k=1;

[0068] When the coating specification is 80-160g / m 2 When k = 0.95;

[0069] When the coating specification is 160-240g / m 2 When k = 0.9;

[0070] When the coating specification is 240-320g / m2 When k = 0.8;

[0071] When the coating specification is greater than 320g / m 2 When k=0.7.

[0072] When the parameter 0<P≤50, the power of the heating element 22 is ≥20kw, and the temperature difference between the middle and edge of the strip is ≤4℃;

[0073] When the parameter 50<P≤100, the power of the heating element 22 is 16-20kw, and the temperature difference between the middle and edge of the strip is ≤4℃;

[0074] When the parameter is 100<P≤200, the power of the heating element 22 is 10-16kw, and the temperature difference between the middle and edge of the strip is ≤6℃;

[0075] When the parameter P>200, the power of the heating element 22 is ≤10kw, and the temperature difference between the middle and edge of the strip is ≤6℃.

[0076] Table 1 Coating thickness of various parts of steel strip (taking production line width specification of 900-1200mm as an example)

[0077]

[0078]

[0079] In Table 1, the independent variables are coating specifications, width specifications (w), thickness specifications (T), process belt speed (v), coating thickness compensation coefficient (k), parameter (P), and heating element 22 power. The dependent variables are the value of center temperature sensor 32, the value of edge temperature sensor 31, temperature difference, center coating quality, edge coating quality, center coating thickness, and edge coating thickness. The smaller the difference between the center coating thickness and the edge coating thickness, the higher the sample quality.

[0080] Table 1 summarizes the test results of the experimental data. It can be seen that the plate edge coating thickness control device in Example 1 and the plate edge coating thickness control method in Example 2 can achieve edge coating thickness control of plate 5, increase edge coating uniformity, and thus reduce the occurrence of thick edge defects.

[0081] This embodiment provides a method for controlling the coating thickness at the edge of a plate. By introducing parameter P, the three variable parameters that affect the coating thickness at the edge of the strip, namely, product coating specification, thickness specification and production strip running speed, are comprehensively quantified. The power of the heating element 22 on the air knife baffle 23 is adjusted according to the P value to reduce the temperature difference between the middle and edge of the strip, thereby realizing the control of the coating thickness at the edge under various specifications and process strip speeds.

[0082] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A device for controlling the thickness of the coating on the edge of a plate, characterized in that: include: A support member (1) having a through slot formed thereon for the plate (5) to pass through; At least two heating components, both connected to the support member (1), and the two heating components are respectively arranged on both sides of the plate (5); A temperature measuring component connected to the support member (1), the temperature measuring component comprising a plurality of temperature measuring sensors arranged around the plate (5); The heating assembly comprises a driving member (21), a heating member (22) and an air knife baffle (23); the driving member (21) is connected to the supporting member (1); the heating member (22) is connected to the air knife baffle (23); the air knife baffle (23) is connected to the driving member (21); and the heating member (22) and the air knife baffle (23) are configured to be driven by the driving member (21) to move closer to or farther away from the edge of the plate (5) so as to compensate for the heat of the edge of the plate (5); The upper and lower ends of the I-shaped air knife baffle (23) extend toward the edge of the plate (5), and an air knife assembly (4) is provided in the space between the upper and lower ends of the air knife baffle (23).

2. The plate edge coating thickness control device according to claim 1, characterized in that: Along the length direction of the plate (5), the side surface of the air knife baffle (23) is in an "I-shape", and heating elements (22) are provided at both the upper and lower ends of the I-shaped air knife baffle (23).

3. The plate edge coating thickness control device according to claim 2, characterized in that: The heating assembly further comprises: A fixed sleeve (24) fixedly connected to the support member (1); A movable sleeve (25), one end of which is movably connected to the support member (1), and the other end of which is connected to the air knife baffle (23); The driving member (21) is arranged between the fixed sleeve (24) and the movable sleeve (25) to drive the movable sleeve (25) to move relative to the support member (1) so as to move the air knife baffle (23) closer to or farther away from the edge of the plate (5).

4. The plate edge coating thickness control device according to claim 3, characterized in that: The heating assembly further comprises a telescopic member (26) connected between the fixed sleeve (24) and the movable sleeve (25), and the telescopic member (26) is configured to be driven by the driving member (21) to extend or contract, so as to control the movement of the movable sleeve (25) relative to the support member (1).

5. The plate edge coating thickness control device according to claim 4, characterized in that: The heating assembly further comprises a power controller (27), and the power controller (27) is connected to the heating element (22).

6. The plate edge coating thickness control device according to claim 4, characterized in that: The two heating components are symmetrically arranged along the center line of the plate (5).

7. The plate edge coating thickness control device according to claim 4, characterized in that: An edge temperature sensor (31) is provided on the movable sleeve (25) to drive the edge temperature sensor (31) to approach or move away from the edge of the plate (5); the edge temperature sensor (31) is U-shaped, and the edge of the plate (5) is provided in an opening of the edge temperature sensor (31) to measure the temperature of three sides of the edge of the plate (5).

8. The plate edge coating thickness control device according to claim 7, characterized in that: A plurality of middle temperature sensors (32) are provided on the through groove portion of the support member (1), and the middle temperature sensors (32) are arranged on opposite sides of the plate (5), and the middle temperature sensors (32) are horizontal with the edge temperature sensors (31).

9. A method for controlling the thickness of a coating on the edge of a plate, used in the device for controlling the thickness of a coating on the edge of a plate according to any one of claims 1 to 8, characterized in that: The method includes: Introduce the parameter P, P=k*T*v, where T is the thickness of the plate (5), in mm, v is the running speed of the plate (5), in m / min, and k is the coating thickness compensation coefficient; in: When the coating specification is 0-80g / m 2 When k=1; When the coating specification is 80-160g / m 2 When k=0.95; When the coating specification is 160-240g / m 2 When k=0.9; When the coating specification is 240-320g / m 2 When k=0.8; When the coating specification is greater than 320g / m 2 When k=0.7; When the parameter 0<P≤50, the heating power ≥20kw, the temperature difference between the middle and edge of the strip ≤4℃; When the parameter is 50<P≤100, the power of the heating element is 16-20kw, and the temperature difference between the middle and edge of the strip is ≤4℃; When the parameter is 100<P≤200, the power of the heating element is 10-16kw, and the temperature difference between the middle and edge of the strip is ≤6℃; When parameter P>200, the power of the heating element is ≤10kw, and the temperature difference between the middle and edge of the strip is ≤6℃.

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