Method and device for removing floating objects on surface of zinc bath

Abstract

The invention discloses a method and device for removing floating objects on the surface of a zinc bath, and the device comprises overflow groove structures which are arranged around a blowing area of a blowing device and in the zinc bath on two sides of a furnace nose; the overflow side of the overflow groove structure is immersed in the zinc bath; the hydraulic lifting device is used for fixedly connecting the overflow groove structure with the zinc bath and adjusting the distance between the overflow side of the overflow groove structure and the liquid level of the zinc bath; the slag collecting tank is arranged at the position, far away from one side of the overflow tank structure, in the zinc bath; the upper part of the slag collecting tank is not communicated with the zinc bath, and the bottom is communicated with the zinc bath; the zinc liquid pump is communicated with the overflow groove structure and the slag collecting groove through a zinc liquid pipeline; and the zinc liquid pump is used for pumping floating objects in the overflow groove structure into the slag collecting groove through the zinc liquid pipeline. According to the method, the floating objects on the surface of the zinc bath can be efficiently and stably removed at low cost, the occurrence rate of the embedding defect of the floating objects is reduced, and the efficiency and quality of the strip steel surface hot dipping process are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of continuous hot-dip galvanizing technology for steel strips, and more specifically, to a method and apparatus for removing floating matter from the surface of a zinc bath. Background Technology

[0002] Steel products are used in all aspects of life and are a mainstay of my country's economic development. Cold-rolled thin steel sheets, in particular, are easily damaged by corrosion without proper protection, leading to a decrease in their competitive advantage and cost-effectiveness. However, after cold rolling and hot-dip galvanizing, thin steel sheets are given a protective layer, greatly enhancing their corrosion resistance and extending their service life, making them popular with many users. Typically, pure zinc (GI) is used for hot-dip galvanizing. Zinc's standard electrode potential is -0.76V. For the steel substrate, the zinc coating is an anodic coating, primarily used to prevent corrosion, while also possessing good paintability, decorative properties, and formability.

[0003] During the hot-dip galvanizing process of strip steel, low-density floating matter is generated and distributed on the surface of the zinc bath. This floating matter easily adheres to the strip steel surface, causing zinc dross defects and severely affecting the surface quality of the strip steel. Currently, the common method is to manually remove the floating matter from the zinc bath surface. However, manual removal is inefficient and causes fluctuations in the zinc bath surface during the process, which in turn causes fluctuations in the zinc bath surface within the furnace nose. Furthermore, the working environment around the zinc bath is very harsh, posing a significant impact on worker health. While mechanical methods for automatically removing floating matter cannot eliminate the fluctuations in the zinc bath surface, it is essential to develop a method and device for removing floating matter from the zinc bath surface.

[0004] Chinese patent CN101787506B discloses a device for removing zinc dross from a zinc pot in a galvanizing line. This device addresses the shortcomings of current manual dross removal methods: the zinc pot is full of molten zinc, causing splashing, and the molten zinc releases toxic dust at high temperatures, resulting in high labor intensity, health hazards, and safety risks. The technical solution includes a dross removal device comprising a support column, a guide screw connected to the support column, a lifting motor, a cantilever structure, a dross removal mechanism, a PLC controller, and a dross pushing mechanism. This technology eliminates safety hazards in production, significantly reduces the labor intensity of operators, improves product quality, reduces scrap rates, and lowers production costs. However, the mechanical device is in direct contact with the molten zinc, which can cause violent fluctuations in the zinc surface during mechanical dross removal and corrode the dross removal mechanism, reducing its service life.

[0005] International patent WO2018223746 discloses a method and device for controlling the flow of molten zinc in a hot-dip galvanizing pot. The method involves an air knife above the pot spraying the strip steel, causing the molten zinc to diffuse outwards into the areas (zones I, II, III, and IV) formed by the left, right, and front sides of the pot, as well as the area between the strip steel and the furnace nose. This also drags the rapidly generated slag on the surface of the molten zinc outwards into these areas. At the edge of these areas, multiple traveling wave magnetic field generators are positioned above the surface of the molten zinc to generate electromagnetic propulsion, driving the flow of the molten zinc. The flow of the molten zinc caused by the traveling wave magnetic field generators is interconnected with the spraying flow from the air knife, causing the surface layer of molten zinc to flow orderly towards the rear end of the pot (zone V). The slag floating on the surface of the molten zinc is dragged by the flowing molten zinc and flows in the controlled direction. This method employs a non-contact slag removal method, resulting in good slag removal efficiency, but the entire equipment is more complex and has a higher cost.

[0006] Chinese patent CN215163038U discloses a zinc dross removal device for hot-dip galvanizing, relating to the field of hot-dip galvanizing production technology. The device includes a zinc pot, with a fixed baffle fixedly connected to both sides of the inner wall of the pot. A movable groove is formed on the top outer wall of the fixed baffle, and an adjusting plate is movably connected to the inner wall of the movable groove. Limiting blocks are fixedly connected to both outer walls of the adjusting plate. By providing a movable groove on the top of the fixed baffle inside the zinc pot, and an adjusting plate within the groove, with limiting blocks on both sides of the adjusting plate to limit its movement, the device works by pressing a pressing plate on the side of the zinc pot. As the pressing plate presses down, the elastic sealing frame and connecting spring deform elastically, causing a pushing plate on the pressing plate to fall and press against the fixed blocks. The adjustable adjusting plate allows the floating dross in the molten zinc to overflow and be discharged. The flow rate of the dross discharge can be controlled by adjusting the adjusting plate. The device is convenient, quick, and has high dross removal efficiency. However, the effectiveness of this zinc dross removal device is limited, and there are many dead zones in the dross removal process.

[0007] Chinese patent CN111118426B discloses a zinc pot slag removal structure and method. It constructs a channel structure for the flow of molten zinc slag, allowing the molten zinc slag to self-fill the channel under the action of a free liquid surface. A slag removal zone is set up. A drive is provided for the molten zinc slag flowing into the channel to form a directional traction force on the molten zinc slag. Under the directional traction force generated by the drive, the molten zinc slag forms a uniform flow field without drop. The molten zinc slag with a uniform flow field without drop is transported along the set channel structure to the slag removal zone, where the molten zinc and zinc slag are separated. The separated zinc slag remains in the slag removal zone. The separated zinc liquid flows back to the zone; this invention provides a zinc pot slag removal structure and method that utilizes the continuously drawn-in zinc liquid flow to drag the zinc slag along a designated path to achieve slag removal, realizing non-overflow slag removal without drop, and overcoming the shortcomings of traditional overflow trough slag removal methods affected by factors such as changes in liquid level and deformation of the overflow trough; however, this method has the problem of uneven zinc liquid suction speed at the suction port, with a high speed near the inlet area of ​​the zinc suction pipe and a low speed far from the inlet area, and the zinc liquid surface slag cannot be effectively removed in the zinc suction area far from the inlet due to the low speed. Summary of the Invention

[0008] To address the problems of low removal efficiency of floating matter on the surface of zinc baths, large fluctuations in the liquid level during the retrieval process, and high removal costs in existing technologies, the purpose of this invention is to provide a method and apparatus for removing floating matter from the surface of zinc baths. This method and apparatus can achieve efficient, stable, and low-cost removal of floating matter from the surface of zinc baths, reduce the incidence of floating matter embedding defects, and greatly improve the efficiency and quality of the hot-dip galvanizing process on the surface of steel strips.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A first aspect of the present invention provides an apparatus for removing floating matter from the surface of a zinc bath, comprising:

[0011] An overflow trough structure includes multiple overflow troughs; the multiple overflow troughs are arranged around the blowing area of ​​the blowing device and in the zinc bath on both sides of the furnace nose; the overflow side of the overflow trough structure is immersed in the zinc bath;

[0012] A hydraulic lifting device is used to fix the overflow trough structure to the zinc bath and to adjust the distance between the overflow side of the overflow trough structure and the liquid surface of the zinc bath.

[0013] The slag collection trough is located inside the zinc bath, away from the overflow trough structure; the upper part of the slag collection trough is not connected to the zinc bath, but the bottom part is connected to the zinc bath.

[0014] A zinc liquid pump connects the overflow tank structure and the slag collection tank via a zinc liquid pipeline; the zinc liquid pump draws floating matter from the overflow tank structure into the slag collection tank via the zinc liquid pipeline.

[0015] Preferably, the overflow trough structure is provided with an overflow trough baffle, a reinforcing rib structure, and a fixed support mechanism; the overflow trough baffle is used to separate the internal channels of the overflow trough structure; the reinforcing rib structure is used to prevent the overflow trough structure from deforming in the zinc bath; the fixed support mechanism includes a plurality of overflow trough support plates that fix the overflow trough structure to the zinc bath.

[0016] The overflow trough structure is provided with two liquid outlets connected to the slag collection trough. The liquid outlets are connected to the slag collection trough through zinc liquid pipes and zinc liquid pumps.

[0017] Preferably, the reinforcing rib structure includes a plurality of external reinforcing ribs disposed outside the overflow trough structure; the plurality of external reinforcing ribs are right-angled wedge-shaped reinforcing ribs or right-angled rectangular reinforcing ribs; the interval between the plurality of external reinforcing ribs is 300-500mm.

[0018] Preferably, the zinc bath has multiple bases on its side platform for mounting the overflow trough structure;

[0019] The number of bases matches the number of overflow tank support plates, and the bases and overflow tank support plates are connected by the hydraulic lifting device; the plane of the base is parallel to the liquid surface of the zinc bath; the interval between multiple bases is 400-600mm.

[0020] Preferably, the overflow trough structure includes a first overflow trough, a second overflow trough, a third overflow trough, and a fourth overflow trough that are internally connected; the first overflow trough and the third overflow trough are perpendicular to the second overflow trough, and the fourth overflow trough is parallel to the second overflow trough; the first overflow trough, the second overflow trough, and the third overflow trough are all arranged close to the edge of the zinc bath, and the first overflow trough, the second overflow trough, the third overflow trough, and the fourth overflow trough are arranged around the blowing area of ​​the blowing device, and the first overflow trough and the third overflow trough extend to both sides of the furnace nose.

[0021] Preferably, the first overflow groove, the second overflow groove, the third overflow groove and the fourth overflow groove are all rectangular grooves with one side higher than the other side, and the lower side of the rectangular groove is the overflow side.

[0022] Preferably, the overflow trough structure is made of 316L stainless steel, and the surface of the exposed area of ​​the overflow trough structure is coated with an anti-slagging coating.

[0023] The top surface of the overflow side of the overflow trough structure is located 1-3 mm below the liquid level in the zinc bath.

[0024] Preferably, the hydraulic lifting device includes multiple hydraulic lifters for connecting the zinc bath and the overflow tank structure; the hydraulic lifters include multiple hydraulic lifting columns disposed on the connection between the zinc bath and the overflow tank structure, and the hydraulic lifting device adjusts the immersion depth of the overflow side of the overflow tank structure in the zinc bath by controlling the lifting of the hydraulic lifting columns.

[0025] Preferably, the bottom of the slag collection trough is V-shaped.

[0026] Preferably, the zinc bath pump uses non-contact electromagnetic force and is positioned 150-200 mm above the zinc bath surface.

[0027] Two zinc liquid pipes are provided, and the outlets of the two zinc liquid pipes are formed by opposing sprays. The outlets of the two pipes are located 50-100mm below the zinc liquid surface in the slag collection tank.

[0028] A second aspect of the present invention provides a method for removing floating matter from the surface of a zinc bath, characterized in that the following steps are performed using an apparatus for removing floating matter from the surface of a zinc bath as described in the first aspect of the present invention:

[0029] S1, using a hydraulic lifting device to adjust the height of the overflow side of the overflow tank structure relative to the zinc bath liquid level;

[0030] S2, Start the zinc liquid pump. Surface floating matter in the zinc bath enters the overflow trough structure from the overflow side. The liquid and surface floating matter in the overflow trough structure are pumped into the slag collection trough by the zinc liquid pump. The liquid in the slag collection trough flows back into the zinc bath from the bottom of the slag collection trough.

[0031] S3 utilizes a mechanical slag-removing device to collect and remove floating debris from the surface of the slag collection tank, thereby clearing the floating debris from the zinc bath.

[0032] Preferably, in step S2, under the action of the zinc liquid pump, the overflow flow rate of the overflow tank structure is balanced with the suction flow rate of the zinc liquid pump;

[0033] The liquid level in the overflow tank structure drops by the following height per second:

[0034] H1 = Q / (L×d)

[0035] The rise in liquid level per second in the zinc bath is:

[0036] H2 = Q / (L0 × d0)

[0037] In the formula, H1 is the drop height of the liquid level inside the overflow tank structure;

[0038] Q is the suction flow rate of the zinc liquid pump;

[0039] L is the length of the overflow side of the overflow trough structure;

[0040] d is the width of the overflow channel inside the overflow trough structure;

[0041] L0 is the length of the zinc bath;

[0042] d0 is the width of the zinc bath.

[0043] Compared with the prior art, the method and apparatus for removing floating matter from the surface of a zinc bath provided by the present invention have the following advantages:

[0044] 1. This invention can remove floating matter from the surface of zinc bath liquid. By overflowing, the floating matter on the surface of zinc bath liquid is collected in the overflow tank and then pumped into the slag collection tank of zinc bath liquid by zinc liquid pump, thereby realizing the centralized collection and cleaning of floating matter. This helps to prevent floating matter on the surface of zinc bath liquid from moving to the surface of strip steel and affecting its quality and production efficiency.

[0045] 2. This invention can maintain the stability of the zinc bath liquid level and reduce the liquid level fluctuation in the furnace nose, thereby ensuring a stable liquid level difference between the liquid level in the furnace nose and the zinc bath liquid level, preventing zinc ash in the furnace nose from adhering to the strip surface due to liquid level fluctuation, and reducing the incidence of zinc ash defects.

[0046] 3. The present invention sets an overflow trough in the zinc bath, and the overflow drives the floating matter on the surface of the zinc bath to the overflow trough. The flow is stable and has little impact on the surface of the zinc bath. In addition, this method has a simple structure and low cost. Furthermore, by changing the arrangement structure, different types of floating matter on the surface of the zinc bath can be removed, making it more applicable.

[0047] 4. The present invention is equipped with a hydraulic lifting device, which is set between the overflow tank support plate and the side base of the zinc bath. The immersion depth of the overflow tank in the zinc bath is controlled by hydraulic lifting, and the overflow side of the overflow tank is always kept 1-3mm below the liquid surface of the zinc bath.

[0048] 5. The present invention is provided with reinforcing ribs. Right-angled wedge-shaped reinforcing ribs are set at intervals of 300-500mm on the outside of the overflow channel, thereby improving the deformation resistance of the overflow channel.

[0049] 6. The overflow trough in this invention is a rectangular groove, in order to better maintain the effect of the overflow side of the overflow trough in removing floating objects from the surface of the zinc bath;

[0050] 7. The present invention is equipped with a zinc liquid pump, which is located 150-200mm above the zinc liquid surface, which can effectively avoid structural interference, improve the liquid suction capacity and the service life of the equipment.

[0051] 8. The present invention is equipped with a pair of zinc liquid pump pipes located 50-100mm below the liquid surface of the slag collection tank. The outlets of the two pipes spray out in opposite directions, and the fluid kinetic energy is mutually canceled by the opposing airflow, thereby ensuring the stability of the liquid flow in the zinc bath.

[0052] 9. The present invention is equipped with a slag collection tank to concentrate the floating objects on the surface of the zinc bath into one area so that the floating objects on the upper part of the slag collection tank can be collected and removed by a robotic arm. When the top surface is not connected, it is necessary to reduce the impact on the surface of the zinc bath. In addition, the "V" shaped groove at the bottom has the function of collecting high-density particles to prevent high-density particles from entering the zinc bath.

[0053] 10. In view of the problems of low removal efficiency of floating objects on the surface of zinc bath, large fluctuations in the liquid level during the retrieval process, and high removal cost, the present invention realizes the centralized removal of floating objects on the surface of zinc bath through an overflow tank. It provides a method and device for efficiently removing floating objects on the surface of zinc bath, maintaining stable internal and external liquid levels, and reducing the cost of floating object removal. It can achieve efficient, stable, and low-cost removal of floating objects on the surface of zinc bath, reduce the incidence of floating object embedding defects, and greatly improve the efficiency and quality of the hot-dip galvanizing process on the surface of steel strip. Attached Figure Description

[0054] Figure 1 This is a schematic diagram illustrating the cleaning principle of removing floating matter from the surface of a zinc bath according to the present invention;

[0055] Figure 2 This is a schematic diagram of the structure for removing floating matter from the surface of a zinc bath according to the present invention;

[0056] Figure 3 This is a schematic diagram of the hydraulic lifting device of the present invention;

[0057] Figure 4 This is a schematic diagram of the overflow groove and wedge-shaped outer reinforcing rib of the present invention;

[0058] Figure 5 This is a schematic diagram of the overflow channel and right-angled outer reinforcing rib of the present invention;

[0059] Figure 6 This is a schematic diagram of the overflow groove and the reinforcing ribs inside the edge opening of the present invention;

[0060] Figure 7 In the figure, (a) is the simulation result of the rectangular overflow channel, and (b) is the simulation result of the trapezoidal overflow channel;

[0061] In the diagram, 1. Zinc bath shell; 2. Zinc bath; 3. Straightening roller; 4. Submerged roller; 5. Strip steel; 6. Slag collection trough; 7. Zinc liquid pump; 8. Zinc liquid pipeline; 9. Overflow trough structure; 901. Overflow trough baffle; 902. Overflow trough support plate; 903. Liquid outlet; 904. Right-angled wedge-shaped reinforcing rib; 905. Right-angled rectangular reinforcing rib; 906. Internal reinforcing rib; 10. Furnace nose; 11. Base; 12. Hydraulic lifter; 1201. Hydraulic lifting column; 13. Pulsating device; Y-1. First overflow trough; Y-2. Second overflow trough; Y-3. Third overflow trough; Y-4. Fourth overflow trough. Detailed Implementation

[0062] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0063] Combination Figure 1 , Figure 2 As shown, the present invention provides a device for removing floating debris from the surface of a zinc bath, comprising an overflow trough structure 9, a hydraulic lifting device, a slag collection trough 6, and a zinc liquid pump 7. The overflow trough structure 9 is arranged around the blowing area A of the blowing device 13 and inside the zinc bath on both sides of the furnace nose 10; the overflow side of the overflow trough structure 9 is immersed in the zinc bath. The hydraulic lifting device is used to fix the overflow trough structure 9 to the zinc bath 2 and to adjust the distance between the overflow side of the overflow trough structure 9 and the liquid surface of the zinc bath 2. The slag collection trough 6 is located behind the furnace nose 10; the upper part of the slag collection trough 6 is not connected to the zinc bath 2, but the bottom part is connected to the zinc bath 2. The zinc liquid pump 7 connects the overflow trough structure 9 and the slag collection trough 6 through a zinc liquid pipe 8; the zinc liquid pump 7 draws floating debris from the slag collection trough 6 into the slag collection trough 6 through the zinc liquid pipe 8. This invention cleans floating matter on the surface of a zinc bath by means of an overflow method. The liquid in the zinc bath is pumped into the slag collection tank 6 by a zinc liquid pump 7 and a zinc liquid pipe 8, causing the liquid level in the zinc bath to drop and creating a liquid level difference. The floating matter on the surface of the zinc bath 2 flows into the overflow tank structure 9 under the overflow action. The zinc liquid pump 7 collects the floating matter in the overflow tank structure 9 into the slag collection tank 6 by suction.

[0064] Combination Figure 1The diagram shown illustrates the cleaning principle for removing floating debris from the surface of a zinc bath. Because a blowing device (13) is present in area A, located on both sides of the strip 5 at a height of 150-200mm above the zinc bath surface, it controls the zinc layer thickness on the strip 5. The blowing by the device increases gas flow and lowers the temperature in area A, resulting in a significant increase in the amount of floating debris generated in area A of the zinc bath. The blowing by the device 13, along with the disturbance caused by the rotation of the strip 5, straightening roller 3, and submerged roller 4, causes the floating debris on the zinc bath surface to form an "∞" shape around the outlet of the strip 5. Furthermore, zinc slag easily accumulates on the roller arm of the submerged roller 4 and the edge of the furnace nose 10. Therefore, automated cleaning of the floating debris in these areas is crucial.

[0065] Combination Figure 1 , Figure 2 As shown, based on the "∞"-shaped distribution of floating debris on the zinc bath surface, an overflow trough structure 9 is designed around the blowing area A and both sides of the furnace nose 10. Under the combined action of the blowing device 13 and the overflow due to the liquid level difference, the floating debris on the zinc bath surface is removed by entering the overflow trough structure 9. Overflow troughs also need to be arranged between the blowing device 13 and the furnace nose 10, and on both sides of the furnace nose 10. Figure 1 , Figure 2As shown, the overflow trough structure 9 includes multiple overflow troughs, each of which is a rectangular groove with one side higher than the other. This rectangular groove can avoid the influence of the backflow of trapezoidal grooves on the flow of floating objects on the surface of the zinc bath, ensuring stable overflow on the overflow side of the overflow trough and removing floating objects from the surface of the zinc bath. The lower side of the rectangular groove is the overflow side, and the top surface of the overflow side of the overflow trough is located 1-3 mm below the surface of the zinc bath 2. When the liquid level in the overflow trough structure 9 decreases, a liquid level difference will be formed with the surface of the zinc bath, causing the floating objects on the surface of the zinc bath to flow into the overflow trough structure 9 under the action of the overflow effect. The overflow trough structure 9 is rationally arranged according to the distribution of floating matter on the zinc bath surface. Specifically, the overflow trough structure 9 includes an internally connected first overflow trough Y-1, a second overflow trough Y-2, a third overflow trough Y-3, and a fourth overflow trough Y-4. The first overflow trough Y-1 ​​and the third overflow trough Y-3 are perpendicular to the second overflow trough Y-2, and the fourth overflow trough Y-4 is parallel to the second overflow trough Y-2. The first overflow trough Y-1, the second overflow trough Y-2, the third overflow trough Y-3, and the fourth overflow trough Y-4 are arranged around the blowing area of ​​the blowing device. The first overflow trough Y-1, the second overflow trough Y-2, and the third overflow trough Y-3 are all arranged close to the edge of the zinc bath. Specifically, the first overflow trough Y-1... The first overflow trough Y-1 ​​is located on the operating side of the strip 5 near the edge of the zinc bath. The second overflow trough Y-2 is located on the edge of the zinc bath near the outlet of the strip 5. The third overflow trough Y-3 is located on the transmission side of the strip 5 near the edge of the zinc bath, mainly to remove surface floating matter inside and around the zinc bath. The fourth overflow trough Y-4 is located in front of the furnace nose 10, which can realize the overflow of liquid on both sides and clean the floating matter between the blowing device and the furnace nose 10. In addition, the first overflow trough Y-1 ​​and the third overflow trough Y-3 are extended to both sides of the furnace nose 10. In order to ensure that the floating matter on the surface of the zinc bath can also be removed by the overflow effect of the overflow trough structure under the obstruction of the submerged roller 4 support, the straightening roller 3 support and the furnace nose 10.

[0066] Combination Figure 2The diagram shows a structure for removing floating debris from the surface of a zinc bath. The zinc bath shell 1 contains a zinc bath 2, which includes straightening rollers 3, submerged rollers 4, and a furnace nose 10 for galvanizing the strip steel 5. To remove floating debris from the zinc bath surface, an overflow trough structure 9, a hydraulic lifting device, a slag collection trough 6, and a zinc liquid pump 7 are installed. The overflow trough structure 9 includes an overflow trough baffle 901, a reinforcing rib structure, and a fixing support mechanism. The overflow trough baffle 901 separates the internal channels of the overflow trough structure 9; specifically, two baffles can be installed, with the second overflow trough Y-2 and the fourth overflow trough Y-4 separating the channels between the first overflow trough Y-1 ​​and the third overflow trough Y-3. The reinforcing rib structure prevents the overflow trough structure 9 from deforming in the zinc bath; the reinforcing rib structure includes multiple external reinforcing ribs located outside the overflow trough structure 9; these external reinforcing ribs are all located on the outside of the overflow trough structure 9, spaced 300-500mm apart; combined with… Figure 4 , Figure 5 As shown, to prevent deformation of the overflow channel structure 9 from affecting the overflow effect, the outer reinforcing rib can be a right-angled wedge-shaped reinforcing rib 904 or a right-angled rectangular reinforcing rib 905, preferably a right-angled wedge-shaped reinforcing rib 904, which has more stable mechanical properties and a lighter overall weight compared to the right-angled rectangular reinforcing rib 905; combined with Figure 6 The inner reinforcing rib 906 shown interferes with the flow of liquid in the overflow tank, making it difficult for floating debris to be removed from the overflow tank structure 9. In contrast to the inner reinforcing rib 906, the outer reinforcing rib can avoid obstructing the flow of internal liquid. In summary, the reinforcing rib structure can prevent the "U"-shaped overflow tank structure 9 from deforming in the high-temperature zinc bath. Without the outer reinforcing rib, the overflow tank structure is easily deformed in the zinc bath due to uneven heating or gravity. Since the height difference between the overflow side of the overflow tank structure and the zinc bath surface needs to be precisely controlled, deformation can easily cause the overflow effect to deteriorate in certain locations, affecting the removal effect of floating debris on the zinc bath surface. The fixed support mechanism includes multiple overflow trough support plates 902 that fix the overflow trough structure 9 to the zinc bath 2. Correspondingly, the side platform of the zinc bath 2 is provided with multiple bases 11 for installing the overflow trough structure 9. The number of bases 11 matches the number of overflow trough support plates 902. The corresponding bases 11 and overflow trough support plates 902 are connected by a hydraulic lifting device. The plane of the base 11 is parallel to the liquid surface of the zinc bath. The interval between the multiple bases 11 is 400-600mm. Since the liquid level in the zinc bath may vary each time, the hydraulic lifting device is needed to adjust the immersion depth on the overflow side to meet the requirements of overflowing to remove floating objects from the zinc bath liquid surface. The overflow trough structure 9 is provided with two liquid outlets 903 that are connected to the slag collection tank 6. The liquid outlets 903 are connected to the slag collection tank 6 through zinc liquid pipes 8 and zinc liquid pumps 7.

[0067] Since the overflow trough structure 9 is immersed in the zinc bath 2, and the zinc liquid in the zinc bath is highly corrosive, in order to ensure the service life of the overflow trough structure 9, the overflow trough structure 9 needs to be made of a material resistant to the corrosion of the zinc bath liquid, such as 316L stainless steel. In addition, floating objects on the surface of the zinc bath are very prone to agglomeration and growth. The part of the overflow trough structure 9 that is completely submerged is not affected, but the part that is exposed to the zinc liquid is more affected. In order to prevent the floating objects on the surface from agglomerating and growing along the wall in the exposed area of ​​the overflow trough structure 9, the surface of the exposed area of ​​the overflow trough structure 9 is sprayed with an anti-slagging coating.

[0068] Combination Figure 2 , Figure 3 As shown, multiple bases 11 are welded to the edge platform of the zinc bath. When welding and installing the bases 11, it is necessary to ensure that the plane of the base 11 is parallel to the liquid surface of the zinc bath. The distance between adjacent bases 11 is 400-600mm. The bases 11 are connected to the overflow tank support plate 902 through a hydraulic lifting device so that when the liquid level of the zinc bath changes, the height of the hydraulic lifting device can be adjusted to ensure the immersion depth of the overflow side of the overflow tank structure 9 in the zinc bath.

[0069] Combination Figure 3 As shown, the hydraulic lifting device includes multiple hydraulic lifters 12 for connecting the zinc bath 2 and the overflow trough structure 9. Each hydraulic lifter 12 includes multiple hydraulic lifting columns 1201 (e.g., four hydraulic lifting columns 1201) located on the zinc bath overflow trough structure 9. This hydraulic lifting device adjusts the horizontal position of the overflow trough structure 9 within the zinc bath and the immersion depth on the overflow side by controlling the lifting of the hydraulic lifting columns 1201. Furthermore, the hydraulic lifters 12 can also slightly adjust the angle of the overflow trough structure 9 within the zinc bath to ensure... To ensure optimal overflow and floating debris removal, during installation, first assemble the overflow trough structure 9 and zinc liquid pipe 8, then use a crane to hoist the assembled device into the zinc bath. The overflow trough support plate 902 is connected to the top surface of the hydraulic lifting column 1201. Adjust the position of the overflow trough structure 9 to ensure that its overflow side is completely submerged 1-3mm below the zinc liquid surface. When the liquid level in the zinc bath changes, the immersion depth of the overflow side of the overflow trough structure 9 can also be kept constant by adjusting the position of the hydraulic lifting column 1201, thereby ensuring normal overflow.

[0070] Combination Figure 2 , Figure 3As shown, the zinc liquid pump 7 draws liquid and floating matter from the overflow tank structure 9 to the slag collection tank 6. The installation height of the zinc liquid pump 7 is 150-200mm to ensure that the zinc bath does not collide with the top surface of the moving channel during the movement of the zinc bath from the non-working position to the working position. Because the overflow side of the overflow tank structure 9 is relatively long, the amount of liquid drawn by the overflow is also large. Traditional zinc liquid pumps 7 cannot meet the usage requirements, so a zinc liquid pump 7 with a larger flow rate needs to be considered. The zinc liquid pump 7 uses non-contact electromagnetic force, utilizing the interaction between the magnetic field and the current in the conductive fluid to create a pressure gradient in the fluid under the electromagnetic force, thereby driving the fluid movement. Since the liquid in the overflow tank structure 9 needs to be transferred through the pump device to remove floating matter from the zinc bath, the form and installation position of the pump device need to comprehensively consider factors such as lifespan, efficiency, ease of disassembly and assembly, and structural interference. This invention involves the reciprocating movement of the zinc bath from the working position to the non-working position. The distance between the upper part of the zinc bath and the top of the moving channel is limited, while traditional suction pump devices require a motor, drive shaft, and... The height of rotating impellers and other devices would exceed the distance between the top of the zinc bath and the top of the moving channel. To reduce this distance, the motor would need to be changed from vertical to horizontal placement, and a steering mechanism would need to be added between the motor and the transmission rod. However, this method results in a more complex structure and a greater workload for manual installation and disassembly. The zinc liquid pump 7 is smaller in size, so its installation on the top of the zinc bath ensures that it will not exceed the distance between the top of the zinc bath and the top of the moving channel, avoiding structural interference during the movement of the zinc bath. The zinc liquid pump 7 has no internal drive shaft or rotating impeller, thus avoiding wear and corrosion of mechanical structures in the liquid and effectively improving its service life. In addition, the zinc liquid pump 7 has a stronger suction capacity, and the flow rate of the zinc liquid pump 7 can be controlled by controlling the current, solving the problem of insufficient flow rate of the original zinc liquid pump 7.

[0071] Combination Figure 2 , Figure 3 As shown, two zinc liquid pipes 8 are provided. The outlets of the two zinc liquid pipes 8 are formed by counter-spraying, and the two pipe outlets are located 50-100mm below the zinc liquid surface in the slag collection tank 6. This arrangement can use counter-blowing to cancel energy, minimize the disturbance of the liquid in the zinc bath to the lower part of the slag collection tank 6, and maintain the stability of the entire liquid surface of the zinc bath.

[0072] Combination Figure 2 , Figure 3As shown, the bottom of the slag collection tank 6 is connected to the zinc bath, and the bottom of the slag collection tank 6 is V-shaped. The top surface of the slag collection tank 6 is not connected to the zinc bath to prevent floating objects pumped by the zinc liquid pump 7 from returning to the surface of the zinc bath. In this area, during the process of fluid spraying out of the zinc liquid pump 7 and the use of robots to retrieve floating objects from the surface, there will be no large fluctuations in the surface of the zinc bath, thus ensuring the stability of the zinc bath surface. The "V"-shaped area at the bottom allows denser particles to accumulate in this area, preventing high-density particles from returning to the zinc bath and avoiding any impact on the surface quality of the product.

[0073] The installation process of the above-mentioned device for removing floating matter from the surface of the zinc bath is as follows:

[0074] (1) When the zinc bath is in a non-working state, the zinc bath will move to a non-working position. There are no operating devices or equipment on the upper part of the zinc bath. First, use a level to weld the base 11 to the edge of the zinc bath. During the welding process, ensure that the base 11 is parallel to the liquid surface of the zinc bath. The position and number of the base 11 correspond to the position and number of the overflow tank support plate 902, so as to ensure the subsequent installation of the overflow tank structure 9.

[0075] (2) Install a hydraulic lifter 12 on each base 11. Each hydraulic lifter 12 includes four hydraulic lifting columns 1201. The hydraulic lifting columns 1201 connect the base 11 and the overflow trough support plate 902 to adjust the horizontal position of the overflow trough structure 9 in the zinc bath and the immersion depth of the overflow side. In addition, the four hydraulic lifting columns 1201 can also adjust the angle of the overflow trough structure 9 in the zinc bath to ensure the best overflow and floating object removal effect.

[0076] (3) First, assemble the overflow tank structure 9 and the zinc liquid pipe 8, and then use a crane to hoist the assembled device into the zinc bath. The overflow tank support plate 902 is connected to the top surface of the hydraulic lifting column 1201. Adjust the position of the overflow tank structure 9 to ensure that its overflow side is completely submerged 1-3mm below the zinc liquid surface.

[0077] (4) The zinc liquid pump 7 draws the liquid and floating matter in the overflow tank to the slag collection tank 6. The installation height of the zinc liquid pump 7 is 200-250mm to ensure that the zinc bath will not collide with the top surface of the moving channel during the process of moving from the non-working position to the working position.

[0078] (5) The zinc liquid pipe 8 is located 50-100mm below the liquid surface of the slag collection tank 6. The outlets of the two pipes are arranged in a jetting manner to counteract the kinetic energy of the liquid at the outlet, thereby reducing the disturbance of the liquid in the slag collection tank 6 by the outlet of the zinc liquid pipe 8 and stabilizing the liquid surface of the zinc bath.

[0079] Combination Figure 2As shown, the present invention also provides a method for removing floating matter from the surface of a zinc bath, comprising the following steps using the aforementioned apparatus for removing floating matter from the surface of a zinc bath:

[0080] S1, use a hydraulic lifting device to adjust the height of the overflow side of the overflow tank structure 9 relative to the liquid level in the zinc bath.

[0081] After the overflow tank structure 9 is installed, the height of the overflow side of the overflow tank structure 9 relative to the zinc bath liquid surface is adjusted using a hydraulic lifting device so that the top surface of the overflow side is submerged 1-3mm below the zinc liquid surface; then the device is installed and debugged.

[0082] S2, start the zinc liquid pump 7, the surface floating matter in the zinc bath 2 enters the overflow trough structure 9 from the overflow side, the liquid and surface floating matter in the overflow trough structure 9 are drawn into the slag collection trough 6 by the zinc liquid pump 7, and the liquid in the slag collection trough 6 flows back into the zinc bath 2 from the bottom of the slag collection trough 6.

[0083] Under the electromagnetic driving force of the zinc liquid pump 7, the liquid in the overflow tank structure 9 is pumped into the slag collection tank 6. The pumping volume of the zinc liquid pump 7 is Q. The liquid level in the overflow tank structure 9 drops. Since the bottom of the slag collection tank 6 is connected to the zinc bath, the liquid that drops in the overflow tank structure 9 causes the liquid level in the zinc bath to rise. The liquid in the zinc bath then enters the overflow tank structure 9 through the overflow side. Finally, the overflow volume of the overflow tank structure 9 and the pumping volume of the zinc liquid pump 7 reach a balance.

[0084] The drop in liquid level per second within overflow tank structure 9 is:

[0085] H1 = Q / (L×d)

[0086] The height of the zinc bath liquid level rising per second is:

[0087] H2 = Q / (L0 × d0)

[0088] In the formula, H1 is the drop height of the liquid level inside the overflow tank structure 9;

[0089] Q is the suction flow rate of zinc liquid pump 7;

[0090] L is the length of the overflow side of the overflow trough structure 9;

[0091] d is the width of the overflow channel inside the overflow trough structure 9;

[0092] L0 is the length of the zinc bath;

[0093] d0 is the width of the zinc bath.

[0094] Ultimately, the liquid level in the overflow tank structure 9 no longer changes. During the continuous overflow process on the overflow side, the floating objects on the surface of the zinc bath will be moved into the overflow tank structure 9. Then, the liquid and floating objects in the overflow tank structure 9 will be pumped into the slag collection tank 6 by the zinc liquid pump 7. The floating objects will be concentrated on the surface of the slag collection tank 6. Since the slag collection tank 6 is not connected to the top surface of the zinc bath, the floating objects will not flow back to the surface of the zinc bath.

[0095] S3, using a mechanical slag removal device to collect the surface floating matter concentrated in the slag collection tank 6, thereby removing the floating matter from the zinc bath.

[0096] The method and apparatus for removing floating matter from the surface of a zinc bath according to the present invention will be further described below with specific examples.

[0097] Example 1

[0098] Because the overflow side of overflow trough structure 9 is relatively long, a reinforcing rib structure is required to prevent deformation and ensure structural stability. Please refer to [reference needed] for details on the form of the reinforcing rib structure. Figure 4 , Figure 5 , Figure 6 ,in Figure 6 The reinforcing ribs are located inside the overflow channel structure 9, and consist of multiple internal reinforcing ribs 906. Figure 4 and Figure 5 The reinforcing ribs are located on the outside of the overflow trough structure 9. However, the reinforcing ribs located inside the overflow trough structure 9 will interfere with the flow of liquid inside the overflow trough structure 9, which is not conducive to the removal of floating objects from the overflow trough structure 9. Figure 4 and Figure 5 The structural forms of the reinforcing ribs differ. Figure 4 The reinforcing rib is a right-angled wedge-shaped 904. Figure 5 The reinforcing ribs 905 are right-angled rectangles. From the perspective of reducing the overall structural mass and maintaining the stability of the overflow channel structure 9, this embodiment preferably uses multiple external reinforcing ribs. Figure 4 Right-angled wedge-shaped reinforcing rib 905.

[0099] Example 2

[0100] Please refer to Figure 7 The overflow characteristics in the zinc bath were compared when the overflow channels were rectangular (each overflow channel had a rectangular cross-section) and trapezoidal (each overflow channel had a trapezoidal cross-section). The shape of the overflow channel cross-section affected the flow of liquid into the overflow channel structure 9 within the zinc bath. Initially, the overflow side of the zinc bath was completely submerged 1-3 mm below the bottom of the zinc bath. As liquid was drawn from the overflow channel structure 9 into the zinc bath, the liquid level in the overflow channel structure 9 decreased, while the liquid level in the zinc bath increased. When the overflow channel cross-section was rectangular, such as... Figure 7As shown in (a), the liquid above the overflow side flows down along the overflow side; when the cross-sectional shape of the overflow channel is trapezoidal, as... Figure 7 As shown in (b), a portion of the liquid surface lift flows along the overflow side towards the outside of the overflow tank structure 9. This flow disrupts the liquid flow on the overflow side. Furthermore, the outward thrust pushes away floating debris brought by the overflow effect, hindering the removal of floating debris from the zinc bath surface. To ensure better overflow and debris removal from the overflow tank structure 9, this embodiment preferably employs the following... Figure 7 (a) Rectangular groove.

[0101] Example 3

[0102] Please refer to Figure 2 From the perspective of suction flow rate, the overflow side of the overflow trough structure 9 is relatively long. The flow rate of traditional suction pumps cannot achieve the removal of liquid and surface floating objects within the overflow trough structure. In order to ensure that the overflow trough structure and the zinc bath form a liquid level difference for overflow, a zinc liquid pump 7 with a larger suction flow rate is required. From the perspective of installation space, the top space of the zinc bath is very limited during the reciprocating movement between the working and non-working positions. The height of traditional suction pumps is relatively high, which will cause interference during the movement of the zinc bath. Therefore, the smaller zinc liquid pump 7 is very suitable for use in this area. From the perspective of service life, traditional suction pumps rely on the rotation of a mechanically rotating impeller to achieve liquid transmission. In this process, the impeller is easily worn and will corrode in the liquid, requiring regular replacement of the mechanically rotating impeller. However, the zinc liquid pump 7 uses non-contact electromagnetic force, so its service life will be greatly improved. This embodiment uses a non-contact electromagnetic force zinc liquid pump 7.

[0103] Example 4

[0104] Please refer to Figure 2 In order to maintain the overflow level difference between the overflow tank structure 9 and the zinc bath, the suction flow rate of the zinc liquid pump 7 is relatively large. Therefore, the liquid velocity at the outlet of the zinc liquid pipe 8 is also relatively large, which in turn has a certain impact on the flow of the entire zinc bath. In order to reduce the impact of the zinc liquid velocity at the outlet of the zinc liquid pipe 8, the arrangement of the two pipe outlets was compared and selected. In this embodiment, the outlet of the zinc liquid pipe 8 is preferably a jet type, located 50-100mm below the liquid surface of the zinc bath.

[0105] In summary, this invention can effectively overcome the problems of difficulty and cumbersome removal of floating objects from the surface of zinc baths in the prior art, and realize the automatic and stable cleaning of floating objects from the surface of zinc baths, with significant potential for widespread application.

[0106] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. A device for removing floating matter from the surface of a zinc bath, characterized in that, include An overflow trough structure includes multiple overflow troughs; the multiple overflow troughs are arranged around the blowing area of ​​the blowing device and in the zinc bath on both sides of the furnace nose; the overflow side of the overflow trough structure is immersed in the zinc bath; A hydraulic lifting device is used to fix the overflow trough structure to the zinc bath and to adjust the distance between the overflow side of the overflow trough structure and the liquid surface of the zinc bath. The slag collection trough is located behind the furnace nose; the upper part of the slag collection trough is not connected to the zinc bath, but the bottom part is connected to the zinc bath. A zinc liquid pump connects the overflow tank structure and the slag collection tank via a zinc liquid pipeline; the zinc liquid pump draws floating matter from the overflow tank structure into the slag collection tank via the zinc liquid pipeline.

2. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that: The overflow trough structure is provided with an overflow trough baffle, a reinforcing rib structure, and a fixed support mechanism; the overflow trough baffle is used to separate the internal channels of the overflow trough structure; the reinforcing rib structure is used to prevent the overflow trough structure from deforming in the zinc bath; the fixed support mechanism includes multiple overflow trough support plates that fix the overflow trough structure to the zinc bath. The overflow trough structure is provided with two liquid outlets connected to the slag collection trough. The liquid outlets are connected to the slag collection trough through zinc liquid pipes and zinc liquid pumps.

3. The apparatus for removing floating matter from the surface of a zinc bath according to claim 2, characterized in that, The reinforcing rib structure includes multiple external reinforcing ribs disposed outside the overflow trough structure; the multiple external reinforcing ribs are right-angled wedge-shaped reinforcing ribs or right-angled rectangular reinforcing ribs; the interval between the multiple external reinforcing ribs is 300-500mm.

4. The apparatus for removing floating matter from the surface of a zinc bath according to claim 2, characterized in that, The zinc bath has multiple bases on its side platform for installing the overflow trough structure. The number of bases matches the number of overflow tank support plates, and the bases and overflow tank support plates are connected by the hydraulic lifting device; the plane of the base is parallel to the liquid surface of the zinc bath; the interval between multiple bases is 400-600mm.

5. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that: The overflow trough structure includes a first overflow trough, a second overflow trough, a third overflow trough, and a fourth overflow trough that are internally connected; the first overflow trough and the third overflow trough are perpendicular to the second overflow trough, and the fourth overflow trough is parallel to the second overflow trough; the first overflow trough, the second overflow trough, and the third overflow trough are all arranged close to the edge of the zinc bath, and the first overflow trough, the second overflow trough, the third overflow trough, and the fourth overflow trough are arranged around the blowing area of ​​the blowing device, with the first overflow trough and the third overflow trough extending to both sides of the furnace nose.

6. The apparatus for removing floating matter from the surface of a zinc bath according to claim 5, characterized in that, The first overflow groove, the second overflow groove, the third overflow groove and the fourth overflow groove are all rectangular grooves with one side higher than the other side, and the lower side of the rectangular groove is the overflow side.

7. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that, The overflow trough structure is made of 316L stainless steel, and the surface of the exposed area of ​​the overflow trough structure is coated with an anti-slagging coating. The top surface of the overflow side of the overflow trough structure is located 1-3 mm below the liquid level in the zinc bath.

8. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that, The hydraulic lifting device includes multiple hydraulic lifters for connecting the zinc bath and the overflow tank structure; the hydraulic lifters include multiple hydraulic lifting columns located on the connection between the zinc bath and the overflow tank structure, and the hydraulic lifting device adjusts the immersion depth of the overflow side of the overflow tank structure in the zinc bath by controlling the lifting of the hydraulic lifting columns.

9. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that, The bottom of the slag collection trough is V-shaped.

10. The apparatus for removing floating matter from the surface of a zinc bath according to claim 1, characterized in that, The zinc liquid pump uses non-contact electromagnetic force and is positioned 150-200mm above the zinc bath surface. Two zinc liquid pipes are provided, and the outlets of the two zinc liquid pipes are formed by opposing sprays. The outlets of the two pipes are located 50-100mm below the zinc liquid surface in the slag collection tank.

11. A method for removing floating matter from the surface of a zinc bath, characterized in that, The following steps are performed using the apparatus for removing floating matter from the surface of a zinc bath as described in any one of claims 1 to 10: S1, using a hydraulic lifting device to adjust the height of the overflow side of the overflow tank structure relative to the zinc bath liquid level; S2, Start the zinc liquid pump. Surface floating matter in the zinc bath enters the overflow trough structure from the overflow side. The liquid and surface floating matter in the overflow trough structure are pumped into the slag collection trough by the zinc liquid pump. The liquid in the slag collection trough flows back into the zinc bath from the bottom of the slag collection trough. S3 utilizes a mechanical slag-removing device to collect and remove floating debris from the surface of the slag collection tank, thereby clearing the floating debris from the zinc bath.

12. The method for removing floating matter from the surface of a zinc bath according to claim 11, characterized in that, In step S2, under the action of the zinc liquid pump, the overflow flow rate of the overflow tank structure and the suction flow rate of the zinc liquid pump are balanced. The liquid level in the overflow tank structure drops by the following height per second: H1 = Q / (L×d) The rise in liquid level per second in the zinc bath is: H2 = Q / (L0 × d0) In the formula, H1 is the drop height of the liquid level inside the overflow tank structure; Q is the suction flow rate of the zinc liquid pump; L is the length of the overflow side of the overflow trough structure; d is the width of the overflow channel inside the overflow trough structure; L0 is the length of the zinc bath; d0 is the width of the zinc bath.

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