Device for removing zinc dross on roller surface of sink roller through ultrasonic waves

Abstract

The invention relates to the technical field of hot galvanizing devices, and discloses a device for removing zinc slag on the roller surface of a sink roller through ultrasonic waves, the device comprises a zinc pot, the sink roller, a stabilizing roller, a deviation rectifying roller and an ultrasonic vibrator, zinc melt is stored in the zinc pot, the sink roller, the stabilizing roller and the deviation rectifying roller are all suspended in the zinc pot and immersed in the zinc melt, and the sink roller is located below the deviation rectifying roller; the ultrasonic vibrator is fixed to the scraper through the supporting arm, the ultrasonic radiation rod and the head of the scraper extend into zinc melt and are located above the sink roll, zinc slag on the roll surface of the sink roll is removed firstly through the ultrasonic cavitation effect and the acoustic streaming effect, and residual zinc slag on the roll surface of the sink roll is removed again through the scraper. Ultrasonic high-frequency vibration is adopted to assist the scraper to synergistically remove the zinc dross, the problems that the zinc dross on the roll surface of the sink roll and the groove is difficult to remove, the roll surface is easily damaged by mechanical dross scraping of the scraper, and massive zinc dross is gathered are solved, the service life of the sink roll is prolonged, the zinc dross on the roll surface is efficiently removed, and the galvanization defect rate is reduced.

Description

Technical Field

[0001] This invention relates to the field of zinc dross removal technology in hot-dip galvanizing equipment, and particularly to an ultrasonic device for removing zinc dross from the surface of submerged rollers. Background Technology

[0002] Currently, the submerged rollers, a key component in hot-dip galvanizing, continuously accumulate large amounts of zinc dross impurities during the galvanizing process. These impurities cause defects on the surface of the galvanized steel sheet, affecting the galvanizing strength and aesthetics, severely impacting the surface quality of the strip, and failing to meet the demands of modern industry. They also reduce the lifespan of the submerged rollers. Current methods for removing zinc dross involve manually or automatically scraping the surface with scrapers. However, scrapers are bulky, and the submerged rollers have grooves, making it difficult for either manual or automatic scrapers to reach these grooves. Furthermore, mechanical dross removal easily damages the roller surface, and large pieces of scraped zinc dross tend to adhere to the galvanized sheet, creating defects. Summary of the Invention

[0003] This invention provides an ultrasonic device for removing zinc dross from the surface of a submerged roller. By using ultrasonic high-frequency vibration to assist a scraper in removing zinc dross, it solves the problems of difficult removal of zinc dross from the surface and grooves of the submerged roller, easy damage to the roller surface by mechanical scraping with a scraper, and accumulation of large pieces of zinc dross. This extends the life of the submerged roller, efficiently removes zinc dross from the roller surface, and reduces the galvanizing defect rate.

[0004] This invention provides an apparatus for ultrasonically removing zinc dross from the surface of a submerged roller, comprising:

[0005] A zinc pot containing molten zinc;

[0006] A stabilizing roller, which is suspended inside the zinc pot by supports on both sides and immersed in the zinc melt, is used to stabilize the position of the strip before it leaves the pot.

[0007] The correction roller is suspended inside the zinc pot by supports on both sides and immersed in the zinc melt. The correction roller is located below the adjacent side of the stabilizing roller and is used to correct the position of the strip steel before it leaves the pot.

[0008] The submerged roller is suspended in the zinc pot by supports on both sides and immersed in the zinc melt. The submerged roller is located below the straightening roller and is used to guide and support the strip steel in the zinc melt, so that the strip steel can pass through the zinc pot smoothly and control the position and angle of the strip steel in the zinc melt.

[0009] An ultrasonic vibrator is fixed to a scraper via a support arm, and the ultrasonic radiation rod of the ultrasonic vibrator and the scraper head extend into the zinc molten body and are located above the submerged roller. It is used to first remove zinc dross from the surface of the submerged roller by utilizing the ultrasonic cavitation effect and acoustic flow effect, and then to remove residual zinc dross from the surface of the submerged roller again by utilizing the scraper.

[0010] Furthermore, the surface of the submerged roller is provided with grooves to prevent the zinc melt from forming a lubricating layer between the strip and the roller surface of the submerged roller, which would cause the strip to slip, and to prevent zinc dross from accumulating. The ultrasonic vibrator removes zinc dross from the grooves of the submerged roller.

[0011] Furthermore, the scraper includes a blade arm and a blade head, the ultrasonic vibrator is fixed to the blade arm by a support arm, and the ultrasonic radiation rod is close to the blade head and is shorter than the blade arm and longer than the blade head.

[0012] Furthermore, the angle between the ultrasonic radiation rod and the tangent in the circumferential direction of the submerged roller surface is 0 to 90°.

[0013] Furthermore, the distance between the ultrasonic radiation rod and the surface of the submerged roller is 5-100mm.

[0014] Furthermore, the ultrasonic radiating rod is immersed in the zinc melt to a depth of 1100 mm.

[0015] Furthermore, ultrasonic waves with a power of 400W-2000W and a frequency of 19k-22k are applied to the ultrasonic radiation rod for 5-30 minutes to remove zinc dross from the roller surface and grooves of the submerged roller.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention effectively avoids damage to the roller surface caused by mechanical slag removal by setting process parameters such as ultrasonic power, ultrasonic frequency, distance between the radiating rod and the roller surface, and included angle. It effectively increases the life of the submerged roller. At the same time, the effective removal of zinc slag in the groove also improves the surface quality of galvanization and reduces galvanization defects. When traditional scrapers remove zinc slag, they easily carry zinc slag to the surface of the strip steel. However, ultrasonic slag removal uses high-frequency sound waves to generate drastic pressure changes in the liquid, forming the rapid generation and collapse of microbubbles, thereby releasing energy to remove zinc slag. The micro-jet impacts the surface of the zinc slag, and the continuous fatigue impact causes the zinc slag to crack and break, and is eventually removed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the device for ultrasonic removal of zinc dross from the surface of a submerged roller according to the present invention.

[0019] Figure 2This is a schematic diagram of the cross-section of the sample before ultrasonic treatment in Experiment 1 of this invention.

[0020] Figure 3 This is a schematic diagram of the cross-section of the sample after ultrasonic treatment in Experiment 1 of this invention.

[0021] Figure 4 This is a schematic diagram of the sample cross-section before ultrasonic treatment in Experiment 2 of this invention.

[0022] Figure 5 This is a schematic diagram of the cross-section of the sample after ultrasonic treatment in Experiment 2 of this invention.

[0023] Figure 6 This is a schematic diagram of the sample surface before ultrasonic treatment in Experiment 2 of this invention.

[0024] Figure 7 This is a schematic diagram of the sample surface after ultrasonic treatment in Experiment 2 of this invention.

[0025] In the attached diagram, 1 is the zinc melt, 2 is the stabilizing roller, 3 is the strip steel, 4 is the correction roller, 5 is the submerged roller, 6 is the ultrasonic vibrator, 7 is the support arm, and 8 is the scraper.

[0026] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] This invention provides an ultrasonic slag removal device for the hot-dip galvanizing process. The entire device includes a zinc pot, a scraper 8, ultrasonic equipment, a submerged roller 5, a steel plate, a stabilizing roller 2, and a guiding roller 4. High-intensity single-source ultrasound is directly applied to the zinc pot, directly acting on the galvanizing process. By employing ultrasonic high-frequency vibration-assisted scraper 8 slag removal technology, the problems of difficult removal of zinc slag from the surface and grooves of the submerged roller 5, easy damage to the roller surface caused by mechanical scraping of the scraper 8, and accumulation of large pieces of zinc slag are solved. This results in extended service life of the submerged roller 5, efficient removal of zinc slag from the roller surface, and reduced galvanizing defect rate.

[0029] like Figure 1 As shown, the present invention provides an ultrasonic device for removing zinc dross from the surface of a submerged roller 5, comprising:

[0030] A zinc pot containing molten zinc 1;

[0031] Stabilizing roller 2, which is suspended in the zinc pot by supports on both sides and immersed in the zinc melt 1, is used to stabilize the position of the strip steel 3 before it leaves the pot;

[0032] The correction roller 4 is suspended in the zinc pot by supports on both sides and immersed in the zinc melt 1. The correction roller 4 is located below the adjacent side of the stabilizing roller 2 and is used to correct the position of the strip steel 3 before it leaves the pot.

[0033] The submerged roller 5 is suspended inside the zinc pot by supports on both sides and immersed in the zinc melt 1. The submerged roller 5 is located below the straightening roller 4 and is used to guide and support the strip 3 in the zinc melt 1, so that the strip 3 can pass through the zinc pot smoothly and control the position and angle of the strip 3 in the zinc melt 1. The surface of the submerged roller 5 is provided with grooves to prevent the zinc melt 1 from forming a lubricating layer between the strip 3 and the roller surface of the submerged roller 5, which would cause the strip 3 to slip, and at the same time prevent zinc dross from accumulating. The ultrasonic vibrator 6 removes zinc dross from the grooves of the submerged roller 5.

[0034] An ultrasonic vibrator 6 is fixed to a scraper 8 via a support arm 7. The ultrasonic radiation rod of the ultrasonic vibrator 6 and the head of the scraper 8 extend into the zinc melt 1 and are located above the submerged roller 5. The vibrator 6 is used to first remove zinc dross from the surface of the submerged roller 5 using the ultrasonic cavitation effect and acoustic flow effect, and then to remove residual zinc dross from the surface of the submerged roller 5 again using the scraper 8.

[0035] In one embodiment, the scraper 8 includes a blade arm and a blade head, the ultrasonic vibrator is fixed to the blade arm by a support arm 7, and the ultrasonic radiation rod is close to the blade head and is shorter than the blade arm and longer than the blade head.

[0036] In one embodiment, the angle between the ultrasonic radiating rod and the tangent in the circumferential direction of the submerged roller 5 is 0-90°, the distance between the ultrasonic radiating rod and the submerged roller 5 is 5-100mm, and the depth to which the ultrasonic radiating rod is immersed in the zinc melt 1 is 1100mm.

[0037] In one embodiment, ultrasonic waves with a power of 400W-2000W and a frequency of 19K-22K are applied to the ultrasonic radiation rod for 5-30 minutes to remove zinc dross from the roller surface and grooves of the submerged roller 5.

[0038] During normal galvanizing, the strip steel 3 enters the zinc pot from the furnace nose at a certain speed, passes through the submerged roller 5, and is guided out of the zinc pot by the correction roller 4 and the stabilizing roller 2. In this invention, an ultrasonic device is fixed to the arm of the scraper 8. The ultrasonic probe of the ultrasonic radiation rod is inserted into the zinc pot at a certain angle and aligned with the submerged roller 5, applying high-intensity single-source ultrasound. The ultrasonic vibration causes acoustic flow, cavitation, and other effects on the roller surface and grooves of the submerged roller 5, effectively removing zinc dross that has just adhered to the roller surface and grooves, while also removing existing zinc dross. Ultimately, this achieves the goal of controlling zinc dross deposition on the roller surface of the submerged roller 5 without damaging the roller surface, extending the life of the submerged roller 5 and improving the quality of the galvanized surface.

[0039] The ultrasonic slag removal process for the submerged roller 5 is divided into two parts based on the area. The first part is the roller surface, where ultrasonic waves work in conjunction with the scraper 8 to remove slag. The ultrasonic probe is aimed at the roller surface. During the galvanizing process, floating slag, surface slag, and bottom slag in the zinc pot continuously adhere to the roller surface and grooves as the submerged roller 5 rotates. At the same time, some zinc slag also grows on the roller surface. At this time, the ultrasonic radiation rod emits ultrasonic waves to generate cavitation and acoustic flow effects. Under the combined effect, the newly adhered zinc slag particles are removed. Stronger zinc slag is cracked and loosened by the ultrasonic action, and then removed by the scraper 8. The second part is the grooves. The zinc slag inside the grooves is difficult to remove with the scraper. Through the ultrasonic cavitation and acoustic flow effects, the zinc slag inside the grooves can be effectively removed.

[0040] The specific process for removing zinc dross:

[0041] The strip steel 3 enters the zinc melt 1 at a certain speed, driving the submerged roller 5. After passing the correction roller 4 and the stabilizing roller 2, it exits from the zinc melt 1. The ultrasonic vibrator 6 is supported by the support arm 7 on the scraper 8 and immersed in the zinc melt to a depth of 1100mm. The angle between the ultrasonic radiation rod and the tangent in the circumferential direction of the submerged roller 5 is 0-90°. The distance between the end face of the ultrasonic radiation rod and the roller surface is 5-100mm. After applying ultrasonic waves at a power of 400w-2000w and a frequency of 19k-22k for 10-30 minutes, the zinc dross on the roller surface and groove is removed. The ultrasonic cavitation effect and acoustic flow effect can generate micro-jet impact on the roller surface and groove, loosening the zinc dross on the surface of the submerged roller 5. For zinc dross with weak bonding, it is directly removed. Subsequently, the scraper 8 is used to continue to remove the remaining zinc dross on the roller surface, and finally the zinc dross on the surface and groove of the submerged roller 5 is removed.

[0042] Ultrasonic cavitation effect for slag removal: When ultrasonic waves emitted by the ultrasonic equipment are transmitted into the zinc molten medium, during the negative pressure half-cycle, the pressure in the zinc molten medium decreases, falling below the saturated vapor pressure of the zinc molten medium. Tiny bubble nuclei form in the zinc molten medium, and these bubble nuclei rapidly expand and grow under the action of the ultrasonic waves. During the positive pressure half-cycle of the ultrasonic waves, the bubbles are compressed. When the bubbles are compressed to their limit, they suddenly collapse, generating pressures of up to thousands of atmospheres and temperatures of thousands of degrees Celsius around the bubbles in a very short time, accompanied by strong shock waves and microjets. This powerful impact force acts directly on the surface of the submerged roller, causing the zinc slag on the surface to loosen, break, and detach from the surface under the impact force.

[0043] Ultrasonic flow effect for slag removal: The ultrasonic flow effect causes macroscopic flow in the molten zinc. This flow carries the zinc slag away from the surface of the submerged roller. The flow layer formed by the ultrasonic flow on the surface of the object generates shear force on the zinc slag. When the shear force is greater than the adhesion force between the impurities and the surface of the submerged roller, the zinc slag will be washed off.

[0044] This invention abandons the traditional mechanical contact slag removal method and replaces it with a synergistic slag removal method using mechanical and ultrasonic physical fields. This effectively reduces the application of mechanical slag removal, improves slag removal efficiency, and increases the life of the submerged roller. In addition, zinc slag in the zinc pot can be driven to the slag removal area by electromagnetic slag driving, preventing zinc slag from adhering to the surface of the submerged roller.

[0045] Experiment 1

[0046] Experimental Procedure: Ultrasonic waves were used to treat the zinc slag on the surface of the submerged roller. The submerged roller sample was cut into 140*60*20mm pieces. The zinc block was placed in a crucible and heated to 500°C to melt. After preheating the sample for 10 minutes, the sample was placed in the crucible. After preheating the ultrasonic radiation rod, the center of the end face of the radiation rod was aligned with the center of the sample surface, with a distance of 50mm between the end face of the ultrasonic radiation rod and the sample surface. The ultrasonic power was adjusted to 700W, and the frequency was between 19500-20000Hz. The equipment was turned on, and the ultrasonic application time was 20-30 minutes. After completion, the sample was removed, and a 10*10*10mm sample was cut from the center. The sample was then ground with sandpaper of 80, 150, 400, 800, 1500, and 2000 grits. Diamond polishing solution was used for polishing. After polishing, the thickness of the zinc slag layer was measured under a metallographic microscope. The thickness before and after ultrasonic vibration was compared to determine the slag removal efficiency.

[0047] Experimental results are as follows Figure 2 , Figure 3 As shown, after single-source high-intensity ultrasonic treatment, the zinc slag layer was measured at the cross-section and the thickness was found to have decreased from 1728 μm to 1268 μm, with a slag removal rate of 30%, effectively removing some of the zinc slag.

[0048] Experiment 2

[0049] The experimental procedure was the same as in Experiment 1. The experimental results are as follows: Figure 4 , 5 As shown in Figures 6 and 7, after the sample was treated, almost all the zinc dross was removed, leaving only a zinc dross layer with a thickness of 35 μm. At the same time, the surface was smooth after ultrasonic treatment.

[0050] This invention effectively avoids damage to the roller surface caused by mechanical slag removal by selecting and matching process parameters such as ultrasonic power, ultrasonic frequency, distance between the radiation rod and the roller surface, and included angle. It effectively increases the life of the submerged roller, and at the same time, the effective removal of zinc slag in the groove also improves the surface quality of galvanization and reduces galvanization defects. When traditional scrapers remove zinc slag, they easily carry zinc slag to the surface of the strip steel. However, ultrasonic slag removal uses high-frequency sound waves to generate drastic pressure changes in the liquid, forming the rapid generation and collapse of microbubbles, thereby releasing energy to remove zinc slag. The micro-jet impacts the surface of the zinc slag, and the continuous fatigue impact causes the zinc slag to crack and break, and is eventually removed.

[0051] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, apparatus, article, or method. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, apparatus, article, or method that includes that element.

[0052] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An ultrasonic device for removing zinc dross from the surface of a submerged roller, characterized in that, include: A zinc pot containing molten zinc; A stabilizing roller, which is suspended inside the zinc pot by supports on both sides and immersed in the zinc melt, is used to stabilize the position of the strip before it leaves the pot. The correction roller is suspended inside the zinc pot by supports on both sides and immersed in the zinc melt. The correction roller is located below the adjacent side of the stabilizing roller and is used to correct the position of the strip steel before it leaves the pot. The submerged roller is suspended in the zinc pot by supports on both sides and immersed in the zinc melt. The submerged roller is located below the straightening roller and is used to guide and support the strip steel in the zinc melt, so that the strip steel can pass through the zinc pot smoothly and control the position and angle of the strip steel in the zinc melt. An ultrasonic vibrator is fixed to a scraper via a support arm, and the ultrasonic radiation rod of the ultrasonic vibrator and the scraper head extend into the zinc molten body and are located above the submerged roller. It is used to first remove zinc dross from the surface of the submerged roller by utilizing the ultrasonic cavitation effect and acoustic flow effect, and then to remove residual zinc dross from the surface of the submerged roller again by utilizing the scraper.

2. The apparatus for ultrasonic removal of zinc dross from the surface of a submerged roller according to claim 1, characterized in that, The surface of the submerged roller is provided with grooves to prevent the zinc melt from forming a lubricating layer between the strip and the roller surface, which would cause the strip to slip, and to prevent zinc dross from accumulating. The ultrasonic vibrator removes zinc dross from the grooves of the submerged roller.

3. The apparatus for ultrasonic removal of zinc dross from the surface of a submerged roller according to claim 1, characterized in that, The scraper includes a blade arm and a blade head. The ultrasonic vibrator is fixed to the blade arm by a support arm. The ultrasonic radiation rod is close to the blade head and is shorter than the blade arm and longer than the blade head.

4. The apparatus for ultrasonic removal of zinc dross from the surface of a submerged roller according to claim 1, characterized in that, The angle between the ultrasonic radiation rod and the tangent in the circumferential direction of the submerged roller surface is 0 to 90°.

5. The apparatus for ultrasonic removal of zinc dross from the surface of a submerged roller according to claim 1, characterized in that, The distance between the ultrasonic radiation rod and the surface of the submerged roller is 5-100mm.

6. The apparatus for ultrasonically removing zinc dross from the surface of a submerged roller according to claim 1, characterized in that, The ultrasonic radiating rod is immersed in the zinc melt to a depth of 1100 mm.

7. The apparatus for ultrasonic removal of zinc dross from the surface of a submerged roller according to claim 1, characterized in that, Ultrasonic waves with a power of 400W-2000W and a frequency of 19k-22k are applied to the ultrasonic radiation rod for 5-30 minutes to remove zinc dross from the surface and grooves of the submerged roller.

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