Zinc pot bath for hot dip galvanizing

Abstract

The utility model belongs to galvanization technical field especially relates to galvanized pool, the utility model provides a kind of zinc pot melting pool for hot galvanizing, it includes: pool body, its top periphery is provided with;Track assembly, it is set on the extension plate of the pool body length direction two sides;Floating layer scraping component, it is straddled on the pool body above, and cooperate with the track assembly, it is suitable for moving along its setting direction;The floating layer scraping component includes crossbeam, the scraper of installation in the crossbeam bottom and the defoaming needle of setting on the scraper;And, traction component, the traction component is connected with the floating layer scraping component, for driving the floating layer scraping component moves along the track assembly;The utility model is by being provided with the scraper with defoaming needle and the specific track assembly matched with it, the efficient crushing and removal of floating layer on zinc liquid surface are realized, and product pass rate is significantly improved.

Description

Technical Field

[0001] This utility model belongs to the field of galvanizing technology, specifically relating to galvanizing pools, and more particularly to zinc pot molten pools for hot-dip galvanizing. Background Technology

[0002] In the hot-dip galvanizing process, the workpiece is immersed in molten zinc (about 450-460℃) to obtain a zinc coating. However, when the workpiece is removed (lifted out of the molten pool), the floating layer on the liquid surface tends to adhere to the workpiece surface, affecting the quality.

[0003] The floating layer on the surface of molten zinc (a flocculent or foamy substance formed by the mixture of zinc oxide, iron-zinc alloy slag, and inclusions with molten zinc) is viscoelastic. Its formation is caused by factors such as high-temperature oxidation of molten zinc, corrosion of iron pots to form alloy phases, residual flux, and surface disturbance during workpiece immersion. The floating layer has strong dynamic fluidity and changes with the production rhythm. Adhesion of the floating layer can lead to problems such as black spots / rough particles on the surface of galvanized parts, excessively thick zinc layers in some areas, reduced adhesion, and increased burden on subsequent processing.

[0004] Existing control technologies, such as mechanical scraping, can remove some of the floating layer. However, in longer pools (for processing longer galvanized parts), the mechanically driven scraper moves back and forth, causing the floating layer to accumulate before reaching the other end. This makes it easy for the workpiece to bypass the scraper and return to the other side of the pool, resulting in the workpiece surface coming into contact with the floating layer during discharge.

[0005] Therefore, how to prevent the workpiece surface from contacting the floating layer during discharge is a technical problem that urgently needs to be solved in this field.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0007] This disclosure provides at least one zinc pot molten pool for hot-dip galvanizing to solve the technical problem of the workpiece surface contacting the floating layer during discharge.

[0008] In a first aspect, embodiments of this disclosure provide a zinc bath for hot-dip galvanizing, comprising: a bath body with an extension plate disposed around its top perimeter; a track assembly disposed on the extension plates on both sides of the bath body along its length; a floating layer scraping assembly spanning above the bath body and cooperating with the track assembly, adapted to move along its designated direction; the floating layer scraping assembly comprising a crossbeam, a scraper mounted at the bottom of the crossbeam, and defoaming needles disposed on the scraper; and a traction assembly connected to the floating layer scraping assembly for driving the floating layer scraping assembly to move along the track assembly; wherein the traction assembly drives the scraper to move along the track assembly, thereby causing the defoaming needles to pierce the floating layer on the surface of the molten zinc.

[0009] In a preferred embodiment, the track assembly includes: a guide platform with a wave-shaped protrusion on its top surface; the floating layer scraping assembly further includes: rollers disposed at both ends of the crossbeam, the rollers engaging with the guide platform in a rolling manner; wherein, when the rollers roll on the wave-shaped protrusion, they drive the entire floating layer scraping assembly to produce an up-and-down undulating motion perpendicular to the direction of movement.

[0010] In a preferred embodiment, side plates are vertically fixed on both sides of the guide platform, and wavy protrusions are provided on the inner side of the side plates; a wave-shaped limiting groove is formed between the wave-shaped protrusions and the side wall of the guide platform, which is consistent with the undulating path of the wave-shaped protrusions, and the two sides of the roller are rotatably embedded in the wave-shaped limiting groove.

[0011] In a preferred embodiment, both sides of the scraper are concave surfaces, the concave surfaces are the forward surfaces, and the defoaming needles are fixed on the forward surfaces in an alternating arrangement.

[0012] In a preferred embodiment, the traction assembly includes a drive unit disposed at the end of the pool body, a pull rope controlled by the drive unit for retraction and extension, a connecting ring disposed on the crossbeam, and the pull rope connected to the connecting ring.

[0013] In a preferred embodiment, the diameter of the defoaming needle is 5 mm to 10 mm, and the center distance between adjacent defoaming needles is 20 mm to 50 mm.

[0014] Secondly, this disclosure provides a zinc bath for hot-dip galvanizing, comprising: a bath body; a track assembly disposed on extension plates on both sides of the bath body along its length; the track assembly comprising: a guide platform with wavy protrusions on its top surface; a floating layer scraping assembly spanning above the bath body; the floating layer scraping assembly comprising a crossbeam, a scraper mounted on the bottom of the crossbeam, and defoaming needles disposed on the scraper; and a traction assembly connected to the floating layer scraping assembly for driving the floating layer scraping assembly to move along the track assembly; wherein the traction assembly drives the scraper to move, thereby causing the defoaming needles to pierce the floating layer on the surface of the molten zinc.

[0015] In a preferred embodiment, the floating layer scraping assembly further includes: rollers disposed at both ends of the crossbeam, the rollers engaging with the guide platform in a rolling manner; wherein, when the rollers roll on the wavy protrusions, they drive the entire floating layer scraping assembly to produce an up-and-down undulating motion perpendicular to the direction of movement; side plates are vertically fixed on both sides of the guide platform, and wavy protrusions are provided on the inner surfaces of the side plates; a wave-shaped limiting groove is formed between the wavy protrusions and the sidewall of the guide platform, which is consistent with the undulating path of the wavy protrusions, and the two side edges of the rollers are rotatably embedded in the wave-shaped limiting groove.

[0016] In a preferred embodiment, both sides of the scraper are concave surfaces, which are the forward surfaces, and the defoaming needles are fixed on the forward surfaces in an alternating manner; the diameter of the defoaming needles is 5 mm to 10 mm, and the center distance between adjacent defoaming needles is 20 mm to 50 mm.

[0017] In a preferred embodiment, the traction assembly includes a drive unit disposed at the end of the pool body, a pull rope controlled by the drive unit for retraction and extension, a connecting ring disposed on the crossbeam, and the pull rope connected to the connecting ring.

[0018] The beneficial effects of this utility model are that it provides a zinc pot molten pool for hot-dip galvanizing, which achieves efficient breaking and removal of the floating layer on the surface of the zinc liquid by setting a scraper with defoaming needles and a specific track assembly that works in conjunction with them. The defoaming needles can pre-puncture, cut, and crush large pieces of viscous floating layer when the scraper moves, so that it cannot adhere to the surface of the workpiece as a whole. This fundamentally avoids defects such as rough coating, black spots, and uneven thickness caused by the adhesion of floating layer, and significantly improves the product qualification rate.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A perspective view of the zinc pot molten pool for hot-dip galvanizing provided in an embodiment of this disclosure; Figure 2 A partial perspective view of the track assembly provided in an embodiment of this disclosure; Figure 3 A perspective view of a floating layer scraping assembly provided in an embodiment of this disclosure.

[0023] In the picture: 1. Pool body; 11. Extension plate; 2. Track assembly; 21. Guide platform; 22. Corrugated protrusion; 23. Side plate; 24. Corrugated rib; 25. Corrugated limiting groove; 3. Floating layer scraping assembly; 31. Crossbeam; 32. Scraper; 33. Defoaming needle; 34. Roller; 35. Connecting ring; 4. Traction assembly; 41. Pull rope. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has revealed the following drawbacks of existing technologies: the floating layer on the zinc bath surface is formed by a mixture of zinc oxide, iron-zinc alloy slag, inclusions, and liquid zinc, exhibiting viscoelasticity. Its formation is attributed to factors including: high-temperature oxidation of the zinc bath, alloy phase formation due to iron pot corrosion, residual flux, and surface disturbance during workpiece immersion. The floating layer exhibits strong dynamic fluidity, changing with the production rhythm. Adhesion of the floating layer can lead to problems such as black spots / rough particles on the galvanized parts surface, excessively thick local zinc layers, reduced adhesion, and increased burden on subsequent processing.

[0030] Existing control technologies, such as mechanical scraping, can remove some of the floating layer. However, in longer pools (for processing longer galvanized parts), the mechanically driven scraper moves back and forth, causing the floating layer to accumulate before reaching the other end. This makes it easy for the workpiece to bypass the scraper and return to the other side of the pool, resulting in the workpiece surface coming into contact with the floating layer during discharge.

[0031] Therefore, how to prevent the workpiece surface from contacting the floating layer during discharge is a technical problem that urgently needs to be solved in this field.

[0032] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0035] like Figures 1 to 3 As shown, some embodiments provide a zinc pot molten pool for hot-dip galvanizing, including: a pool body 1, with an extension plate 11 arranged around its top perimeter; the pool body 1 is the core container for containing molten zinc, and the extension plate 11 arranged around its top perimeter is an important structural feature. The main function of the extension plate 11 is to provide a stable and flat mounting base for the track assembly 2. Since the hot-dip galvanizing production process involves high temperature and mechanical vibration, a robust mounting platform is essential.

[0036] The expansion plate 11 effectively widens the bearing area at the top of the pool body 1, preventing the track assembly 2 from deforming or shifting due to long-term load and thermal stress, ensuring the accuracy and long-term stability of the entire floating layer removal device's operating trajectory. Its cooperation with the track assembly 2 is the foundation for the reliable operation of the device.

[0037] The track assembly 2 is set on the extension plates 11 on both sides of the length direction of the pool body 1. The track assembly 2 is the guiding and driving core of the entire device. It is symmetrically set on both sides of the length direction of the pool body 1 and determines the movement path of the floating layer scraping assembly 3. This layout ensures that the scraping operation can cover the entire width of the zinc liquid surface without dead angles. The track assembly 2 is not just a simple sliding track. Its unique design (as described below, the wave-shaped structure) transforms the driving force of horizontal movement into a beneficial compound movement of the scraper 32. This is an innovation that solves the drawbacks of traditional slag scraping methods. Its stable connection with the pool body 1 and the extension plates 11 is a prerequisite for ensuring the accuracy of movement.

[0038] In addition, the slow up-and-down movement of the track assembly 2 not only allows the defoaming needle 33 to pierce the floating layer horizontally, but also allows it to move up and down, piercing and separating the floating layer in the vertical direction.

[0039] The floating layer scraping component 3 is positioned above the pool body 1 and cooperates with the track component 2, making it suitable for moving along its set direction. The floating layer scraping component 3 is the functional terminal for performing the floating layer removal task. Its design of being positioned above the pool body 1 allows it to complete the operation across the entire width of the liquid surface without contacting the molten zinc. The cooperation between it and the track component 2 is crucial. This cooperation is not passive sliding, but active and controlled interaction. The contour of the track component 2 determines the movement mode of the floating layer scraping component 3, thereby achieving advanced functions that go beyond simple pushing and scraping. The stability of its movement and the accuracy of its trajectory directly depend on the cooperation precision with the track component 2.

[0040] The floating layer scraping component 3 includes a crossbeam 31, a scraper 32 installed at the bottom of the crossbeam 31, and a defoaming needle 33 set on the scraper 32. The crossbeam 31 serves as the core load-bearing and transmission structure, connecting the forces on the two side track components 2 into one, ensuring synchronous movement. The scraper 32 is the functional surface that directly acts on the floating layer. Its V-shaped or U-shaped design (see below) is crucial for collecting scum. The defoaming needle 33 is a feature of actively breaking bubbles.

[0041] Before the scraper 32 pushes the floating layer as a whole, these dense needle-like objects first pierce the floating layer. The floating layer is a mixture of gas, solid (oxides, slag particles), and liquid (zinc droplets), which has viscoelasticity and a certain structural strength. The defoaming needles 33 destroy the network structure and integrity of the floating layer in advance through physical piercing, dividing and breaking the large, viscous floating layer into small, loose parts.

[0042] Specifically, the forward and vertical movement of the defoaming needle 33 greatly reduces the viscosity of the floating layer, making it less likely to clump together and adhere; secondly, the breaking process helps to release the encapsulated zinc droplets, allowing them to flow back into the molten pool under gravity, reducing zinc consumption; finally, the broken floating layer is more easily pushed and collected by the subsequent scraper 32, significantly reducing the load on the scraper 32 and avoiding "bridging" or "overtaking" phenomena.

[0043] In addition, there is a traction component 4, which is connected to the floating layer scraping component 3 and is used to drive the floating layer scraping component 3 to move along the track component 2. The traction component 4 is the power source of the device. It provides the driving force for the floating layer scraping component 3 to move along the track. Its stable and controllable traction force is the basis for ensuring that the entire cleaning process is carried out at a uniform speed and smoothly. Too fast or too strong traction will cause zinc liquid to splash and the floating layer to be rolled up again, while too slow will affect efficiency. The reliable connection between the traction component 4 and the floating layer scraping component 3 (through the crossbeam 31) ensures the effective transmission of power.

[0044] The traction component 4 drives the scraper 32 to move along the track component 2, thereby causing the defoaming needle 33 to pierce the floating layer on the surface of the zinc liquid.

[0045] The track assembly 2 includes a guide platform 21 with a wave-shaped protrusion 22 on its top surface. The guide platform 21 is the basic platform of the track assembly 2. The wave-shaped protrusion 22 on its top surface is one of the core innovative features of this embodiment. It is not a flat track, but a continuous raised path with a specific waveform (such as a sine wave or a trapezoidal wave). The purpose of this design is to transform the horizontal, linear movement into a periodic movement in the vertical direction through mechanical interference. When the roller 34 rolls on it, it is forced to follow the trajectory of the wave, thereby transforming the horizontal traction force into the up-and-down undulation of the scraper 32. This "wave-shaped" design simulates the delicate movements of a worker's shovel with a slight lifting and flipping motion when manually removing slag. Its principle is to dynamically break the stable state of the slag layer and prevent it from "slipping" over the scraper as a whole fluid.

[0046] The floating layer scraping assembly 3 also includes rollers 34 disposed at both ends of the crossbeam 31. The rollers 34 are in rolling engagement with the guide table 21. The rollers 34 are the key interface components between the floating layer scraping assembly 3 and the track assembly 2. The use of rolling engagement instead of sliding engagement can greatly reduce frictional resistance, making the large scraper assembly easier to pull in high-temperature environments and reducing wear. The rollers 34 are the direct executors that convert the geometry of the track wave-shaped protrusions 22 into the actual movement of the scraper 32.

[0047] When the roller 34 rolls on the wave-shaped protrusion 22, it drives the entire floating layer scraping assembly 3 to produce an up-and-down undulating motion perpendicular to the direction of movement. This "up-and-down undulating motion" is different from the traditional scraper, which only moves horizontally and allows scum to easily slip away from its bottom and sides. The undulating motion in this design produces the following effects: First, the plowing effect: the scraper 32 periodically cuts into and lifts out of the scum layer, like plowing the land, effectively breaking the continuity of the scum and preventing it from forming a whole flow. Second, it promotes the settling of zinc liquid: the undulating motion creates vertical disturbance on the scum, which helps the zinc droplets trapped inside to break free due to gravity and return to the molten pool. Finally, it reduces static pressure: the periodic lifting avoids the continuous high pressure of the scraper on the scum, making it easier to push.

[0048] The guide platform 21 has side plates 23 fixed vertically on both sides, and the inner side of the side plate 23 is provided with a wave-shaped protrusion 24; the wave-shaped protrusion 24 and the side wall of the guide platform 21 form a wave-shaped limiting groove 25 that is consistent with the undulating path of the wave-shaped protrusion 22, and the two sides of the roller 34 can be rolled and embedded in the wave-shaped limiting groove 25.

[0049] The side plate 23 and its wavy protrusions 24 constitute an important constraint and guiding mechanism. The side plate 23 is vertically fixed to both sides of the guide platform 21, forming a guide channel. Its waveform must be completely synchronized (phase consistent) with the waveform of the wavy protrusions 22 on the top surface of the guide platform. This is the key to ensuring that the scraper 32 does not jam or deflect during complex movements. The wavy ridge 24 and the side wall of the guide platform 21 together form a wavy limiting groove 25. This limiting groove 25 is consistent with the path of the wavy ridge 22 at the top, forming a three-dimensional, closed motion constraint track. The two sides of the roller 34 are embedded in this groove. This design means that the roller 34 is strictly constrained in both the horizontal and vertical directions, completely preventing it from shifting laterally or jumping during movement. This is crucial for long-sized scrapers, ensuring that both ends remain precisely synchronized throughout the stroke of tens of meters, avoiding scraper distortion or interference with the pool wall caused by asynchrony. It solves the core problem of leakage of the floating layer caused by the gap on both sides of the traditional scraper, and achieves true "sealed" scraping.

[0050] Both sides of the scraper 32 are concave, and the concave surface is the forward surface. The defoaming needles 33 are fixed on the forward surface in an alternating arrangement. The forward surface of the scraper 32 is designed with a V-shaped or U-shaped concave surface, so that it can naturally gather the dispersed scum towards the center line when it moves forward, playing the role of collecting and concentrating the scum. The defoaming needles 33 are fixed on the concave surface in an alternating arrangement. After optimization, the alternating arrangement (or plum blossom arrangement) can arrange more needles in the same area compared with the matrix arrangement, and there are no obvious straight-line gaps. The cutting of the floating layer is more uniform and thorough, avoiding the situation where the floating layer slips through the gaps between the needle arrays in pieces, thus maximizing the crushing efficiency.

[0051] The traction assembly 4 includes a drive unit located at the end of the pool body 1, a pull rope 41 controlled by the drive unit for retraction and extension, and a connecting ring 35 on the crossbeam 31, with the pull rope 41 connected to the connecting ring 35. The drive unit (such as a motor winch) is located at the end of the pool body, away from the high-temperature zone, which is beneficial for protection. The pull rope 41 (which can be a steel cable or a chain) has a flexible transmission method and is suitable for long strokes. It is connected to the crossbeam 31 through the connecting ring 35, which has a simple structure and is easy to install and disassemble. This arrangement provides stable and controllable power for the entire system.

[0052] The diameter of the defoaming needle 33 is 5 mm to 10 mm, and the center distance between adjacent defoaming needles 33 is 20 mm to 50 mm.

[0053] To verify the effectiveness of the above defoaming needle parameters, comparative tests were conducted on defoaming needles of different specifications under the same hot-dip galvanizing process conditions (zinc bath temperature: 450±5℃, workpiece lifting speed: 1.5m / min). The results are shown in the figure below:

[0054] Data Analysis and Conclusions: Optimizing the Balance Between Diameter and Spacing (Experimental Groups 1-3 vs. Comparative Groups 1-2): Comparative Example 1 (3mm diameter, 15mm spacing): The needles are too thin and too dense, resulting in insufficient strength and easy deformation. The dense needle array also prevents scum from passing through smoothly, forming "bridges" and severe blockages between the needles. This not only greatly increases the traction load, but the blocked needle array also loses its function of breaking up the floating layer, resulting in an effect that is even worse than that of traditional scrapers. The high zinc content (68%) also prevents the zinc liquid from effectively settling and flowing back due to blockage.

[0055] Comparative Example 2 (diameter 12mm, spacing 60mm): The needles are too thick and the spacing is too large. Although the mechanical strength is high and there is no blockage, there are too few action points per unit area, which cannot effectively break the floating layer ("the floating layer is not cut thoroughly"). Large pieces of floating layer are still easy to flow as a whole, resulting in a significantly higher coating defect rate (2.5%). The high zinc content of the slag (85%) also indicates that the zinc liquid release effect is poor.

[0056] Experimental groups 1-3 (diameter 5-10mm, spacing 20-50mm): Within this parameter range, the best overall results were achieved. Zinc content in the scum: maintained at a low level of 72%-78%, proving that the needle array under these parameters can effectively release the encapsulated zinc liquid, reducing zinc consumption; Coating defect rate: all below 0.3%, far superior to the comparative group, proving its effective prevention of floating layer adhesion and ensuring product quality; Operating condition: moderate and stable resistance, no blockage or slight adhesion can be automatically cleared by the undulating motion, ensuring the long-term stable operation of the device.

[0057] Optimal parameter combination: Based on the data, experimental group 2 (8mm diameter, 35mm center distance) performed the best, with a coating defect rate of less than 0.1% and optimal operating conditions. This may be the optimal combination for this specific operating condition.

[0058] Within a diameter range of 5-10mm, the needle body has sufficient strength and heat resistance to withstand the scouring of molten zinc and the resistance of scum.

[0059] Within a center distance range of 20-50mm, a perfect balance between crushing effect and anti-clogging performance is achieved; when the distance is close to 20mm, the crushing is finer but adhesion needs to be monitored; when the distance is close to 50mm, the anti-clogging performance is better and the effect is still far superior to the traditional method.

[0060] In summary, the experimental data fully demonstrates that setting the diameter of the defoaming needles to 5 mm to 10 mm and the center distance to 20 mm to 50 mm is the key parameter range for achieving efficient defoaming, low zinc consumption, high-quality coating, and stable operation of the device. This range achieves the optimal balance between mechanical strength, defoaming efficiency, and anti-clogging capability, and is the preferred solution verified in practice.

[0061] Some embodiments provide a zinc bath for hot-dip galvanizing, comprising: a bath body 1; a floating layer scraping assembly 3, which is disposed above the bath body 1; the floating layer scraping assembly 3 includes a crossbeam 31, a scraper 32 installed at the bottom of the crossbeam 31, and an antifoaming needle 33 disposed on the scraper 32; and a traction assembly 4, which is connected to the floating layer scraping assembly 3 and is used to drive the floating layer scraping assembly 3 to move along a track assembly 2; wherein the traction assembly 4 drives the scraper 32 to move so as to drive the antifoaming needle 33 to pierce the floating layer on the surface of the zinc liquid.

[0062] The track assembly 2 is mounted on the extension plates 11 on both sides of the length of the pool body 1. The track assembly 2 includes a guide platform 21 with a wave-shaped protrusion 22 on its top surface. The floating layer scraping assembly 3 also includes rollers 34 mounted at both ends of the crossbeam 31, which roll in cooperation with the guide platform 21. When the rollers 34 roll on the wave-shaped protrusion 22, they drive the floating layer scraping assembly 3 to move up and down perpendicular to the direction of movement. Side plates 23 are vertically fixed on both sides of the guide platform 21, and wave-shaped protrusions 24 are provided on the inner side of the side plates 23. A wave-shaped limiting groove 25 is formed between the wave-shaped protrusion 24 and the side wall of the guide platform 21, which is consistent with the undulating path of the wave-shaped protrusion 22. The two sides of the rollers 34 are rotatably embedded in the wave-shaped limiting groove 25.

[0063] Both sides of the scraper 32 are concave surfaces, which are the forward surfaces. The defoaming needles 33 are fixed on the forward surfaces in an alternating manner. The diameter of the defoaming needles 33 is 5 mm to 10 mm, and the center distance between adjacent defoaming needles 33 is 20 mm to 50 mm.

[0064] The traction assembly 4 includes a drive unit located at the end of the pool body 1, a pull rope 41 controlled by the drive unit for retraction and extension, and a connecting ring 35 provided on the crossbeam 31. The pull rope 41 is connected to the connecting ring 35.

[0065] Specific workflow: Start-up and traction: The drive unit of the traction component 4 operates, winding up the pull rope 41 and pulling the crossbeam 31 through the connecting ring 35, thereby driving the entire floating layer scraping component 3 to move along the length of the pool.

[0066] Composite motion generation: When the component moves, the rollers 34 at both ends of the crossbeam 31 roll on the wave-shaped protrusions 22 of the guide platform 21. Since the two sides of the rollers 34 are embedded in the wave-shaped limiting grooves 25 formed by the wave-shaped protrusions 24 on the side plate 23 and the side wall of the guide platform, the rollers 34 are forced to move along a three-dimensional wave-shaped path. This forces the floating layer scraping component 3 to generate a stable up-and-down undulating motion perpendicular to the liquid surface while moving horizontally.

[0067] Pre-crushing and gathering: Before the main body of scraper 32 contacts the floating layer, the defoaming needles 33 arranged in an alternating pattern on its forward surface first pierce the floating layer. Driven by the composite motion of the scraper (forward movement + undulation), the defoaming needles 33 efficiently cut, pierce and crush the floating layer, destroying its overall structure and viscosity. Subsequently, the scraper 32 with a concave surface gathers the crushed and loose scum towards the center line.

[0068] Dynamic removal and prevention of backflow: Throughout the process, the undulating motion (plowing effect) of the scraper 32 continuously breaks the stability of the scum, while the wave-shaped limiting grooves 25 on both sides ensure that the two ends of the scraper 32 are synchronized and there is no lateral gap, which effectively prevents the scum from "crossing" the scraper from both sides and flowing back to the cleaned area. The scum collected at one end of the pool or the designated scum collection area becomes dry, easy to handle, and can be easily scooped up.

[0069] Creating a clean discharge area: After completing the cleaning process of one cycle, the zinc liquid surface forms a wide clean area at the discharge station, from which the workpiece can be lifted, greatly reducing the risk of floating layer adhesion and ensuring coating quality.

[0070] In summary, by setting up a guide platform 21 with a specific wave-shaped track, a side plate 23 with its wave-shaped limiting groove 25, and a concave scraper 32 with staggered defoaming needles 33, the above-mentioned method achieves the pre-breaking, efficient collection, and dynamic sealed scraping of the floating layer on the zinc liquid surface, resulting in a significant improvement in coating quality and a substantial increase in product qualification rate. At the same time, by breaking the floating layer to release zinc liquid and precisely removing it, the consumption of metallic zinc and production costs are reduced. Furthermore, through three-dimensional track constraints and rolling coordination, the stability and reliability of the device during long-term operation in high-temperature and harsh environments and its adaptability to long zinc pools are improved, fundamentally solving the technical problems of slag backflow, incomplete removal, and easy adhesion to workpieces that exist in traditional slag scraping methods.

[0071] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0072] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0073] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A zinc bath for hot-dip galvanizing, characterized in that, include: The pool body (1) has an extension plate (11) around its top perimeter. The track assembly (2) is disposed on the extension plates (11) on both sides of the length direction of the pool body (1); A floating layer scraping assembly (3) is positioned above the pool body (1) and cooperates with the track assembly (2) to move along its setting direction; The floating layer scraping assembly (3) includes a crossbeam (31), a scraper (32) installed at the bottom of the crossbeam (31), and defoaming needles (33) disposed on the scraper (32). as well as, The traction component (4) is connected to the floating layer scraping component (3) and is used to drive the floating layer scraping component (3) to move along the track component (2); wherein, the traction component (4) drives the scraper (32) to move along the track component (2) so as to drive the defoaming needle (33) to pierce the floating layer on the surface of the zinc liquid.

2. The zinc bath for hot-dip galvanizing as described in claim 1, characterized in that, The track assembly (2) includes: a guide platform (21) with a wave-shaped protrusion (22) on its top surface; The floating layer scraping assembly (3) further includes: rollers (34) disposed at both ends of the crossbeam (31), the rollers (34) rollingly engaging with the guide platform (21); When the roller (34) rolls on the wave-shaped protrusion (22), it drives the floating layer scraping assembly (3) to produce an up-and-down undulating motion perpendicular to the direction of movement.

3. The zinc bath for hot-dip galvanizing as described in claim 2, characterized in that, The guide platform (21) has side plates (23) vertically fixed on both sides, and the inner side of the side plates (23) is provided with wavy convex strips (24). Between the wavy protrusion (24) and the side wall of the guide platform (21), a wave-shaped limiting groove (25) is formed that is consistent with the undulating path of the wavy protrusion (22). The two sides of the roller (34) are rotatably embedded in the wave-shaped limiting groove (25).

4. The zinc bath for hot-dip galvanizing as described in claim 1, characterized in that, Both sides of the scraper (32) are concave surfaces, which are the forward surfaces. The defoaming needles (33) are fixed on the forward surfaces in an alternating manner.

5. The zinc bath for hot-dip galvanizing as described in claim 1, characterized in that, The traction assembly (4) includes a drive unit located at the end of the pool body (1), a pull rope (41) controlled by the drive unit for retraction and extension, a connecting ring (35) provided on the crossbeam (31), and the pull rope (41) connected to the connecting ring (35).

6. The zinc bath for hot-dip galvanizing as described in any one of claims 1-5, characterized in that, The diameter of the defoaming needle (33) is 5 mm to 10 mm, and the center distance between adjacent defoaming needles (33) is 20 mm to 50 mm.

7. A zinc bath for hot-dip galvanizing, characterized in that, include: pool(1); The track assembly (2) is disposed on the extension plates (11) on both sides of the length direction of the pool body (1); The track assembly (2) includes: a guide platform (21) with a wave-shaped protrusion (22) on its top surface; A floating layer scraping assembly (3) is installed across the top of the pool body (1); the floating layer scraping assembly (3) includes a crossbeam (31), a scraper (32) installed at the bottom of the crossbeam (31), and a defoaming needle (33) disposed on the scraper (32). as well as, A traction assembly (4) is connected to the floating layer scraping assembly (3) and is used to drive the floating layer scraping assembly (3) to move along the track assembly (2); The traction component (4) drives the scraper (32) to move so that the defoaming needle (33) pierces the floating layer on the surface of the zinc liquid.

8. The zinc bath for hot-dip galvanizing as described in claim 7, characterized in that, include: The floating layer scraping assembly (3) further includes: rollers (34) disposed at both ends of the crossbeam (31), the rollers (34) rollingly engaging with the guide platform (21); When the roller (34) rolls on the wave-shaped protrusion (22), it drives the floating layer scraping assembly (3) to produce an up-and-down undulating motion perpendicular to the direction of movement. The guide platform (21) has side plates (23) vertically fixed on both sides, and the inner side of the side plates (23) is provided with wavy convex strips (24). Between the wavy protrusion (24) and the side wall of the guide platform (21), a wave-shaped limiting groove (25) is formed that is consistent with the undulating path of the wavy protrusion (22). The two sides of the roller (34) are rotatably embedded in the wave-shaped limiting groove (25).

9. The zinc bath for hot-dip galvanizing as described in claim 8, characterized in that, Both sides of the scraper (32) are concave surfaces, the concave surfaces are the forward surfaces, and the defoaming needles (33) are fixed on the forward surfaces in an alternating manner; The diameter of the defoaming needle (33) is 5 mm to 10 mm, and the center distance between adjacent defoaming needles (33) is 20 mm to 50 mm.

10. The zinc bath for hot-dip galvanizing as described in claim 9, characterized in that, The traction assembly (4) includes a drive unit located at the end of the pool body (1), a pull rope (41) controlled by the drive unit for retraction and extension, a connecting ring (35) provided on the crossbeam (31), and the pull rope (41) connected to the connecting ring (35).

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