A device for blowing and scraping hot galvanizing zinc pot surface slag

Abstract

The present application relates to the field of hot galvanizing surface slag cleaning, and relates to a device for blowing and scraping hot galvanizing zinc pot surface slag, which comprises a zinc pot and a pneumatic slag removal device arranged in the zinc pot, wherein the pneumatic slag removal device comprises a shell and a gas distribution pipe in communication with the shell, the gas distribution pipe is provided with an air inlet, a gas chamber for storing gas is arranged in the shell, gas channel side plates are arranged in parallel at the bottom of the shell, a gas chamber in communication with the gas distribution pipe is arranged on the shell, a plurality of blowing ports are formed through the lower end surface of the gas chamber, and a flow guide plate is rotatably connected to the outside of each blowing port; the flow guide plate is vertically arranged between the gas channel side plates. Compared with the prior art, the present application has the advantages of reducing manual labor operation, improving the automation level of the zinc pot, and improving the production efficiency.

Description

Technical Field

[0001] This invention relates to the field of hot-dip galvanizing slag removal, and in particular to a device for removing slag from hot-dip galvanized zinc pots by blowing air. Background Technology

[0002] In modern hot-dip galvanizing production, zinc dross defects are one of the main problems restricting the quality of hot-dip galvanized products. Zinc, aluminum in the zinc bath and iron brought in from the strip steel are prone to chemical reactions at high temperatures to form ternary metal compounds of Zn-Fe-Al system, namely zinc dross. Zinc dross can be divided into three categories according to different densities and compositions: surface dross, suspended dross and bottom dross. Its main components are oxides and intermetallic compounds.

[0003] To minimize or suppress zinc dross formation, common methods include controlling process parameters such as the concentrations of [Fe] and [Al] in the zinc bath, the zinc bath temperature, and the immersion time. However, since the Fe / Zn reaction involved in zinc dross formation is an intrinsic reaction in the hot-dip galvanizing process, dross formation is difficult to avoid. Therefore, determining how to remove zinc dross from the zinc pot after its formation is a crucial issue that must be addressed to further improve the quality of the steel strip coating. For bottom dross in the zinc pot, traditional methods involve periodically stopping production to remove dross, or removing dross while production is ongoing, which significantly impacts the surface quality of the steel strip and production efficiency. For top dross in the zinc pot, traditional methods include robotic arm removal and manual removal. Robotic arm removal suffers from limitations due to the complexity of the equipment layout, such as the submerged rollers in the zinc pot area, making it difficult for the robotic arm to completely cover the removal area, resulting in insufficient flexibility and poor removal efficiency. Manual removal heavily relies on the operator's experience, causes significant disturbance to the zinc bath surface, and is dangerous and labor-intensive due to the high-temperature environment, resulting in low removal efficiency.

[0004] Chinese patent CN214168094U discloses a two-point gripping robotic zinc pot slag removal device, which uses an adjustable robotic arm to automatically grasp slag removal tools for slag removal. However, this method requires periodic replacement of the slag removal shovel at the front end of the robotic arm, limiting further improvements in production efficiency. Chinese patent application CN108998750B discloses a method and device for controlling the flow of molten zinc in a hot-dip galvanized zinc pot. It employs the principle of linear motor electromagnetic drive, using electromagnetic force to drive the movement of the molten zinc. Simultaneously, the viscous force between the molten zinc and the zinc slag causes the slag to move, thus achieving the purpose of slag removal. However, the above method consumes a large amount of electrical energy, and the electromagnetic slag removal device is relatively large, significantly increasing the difficulty of installing the device on the surface of the zinc pot. Furthermore, in this method, the traveling wave magnetic field generator is constantly exposed above the high-temperature molten zinc, which greatly reduces the lifespan of the traveling wave magnetic field generator.

[0005] In the hot-dip galvanizing process of strip steel, to ensure the uniformity of the coating thickness, air knives need to be installed on both sides of the strip steel outlet. These knives serve two purposes: firstly, they scrape off excess molten zinc from the strip surface, ensuring a uniform coating thickness; secondly, the sprayed gas, after being blown along the strip to the surface of the zinc pot, spreads to the left and right along the zinc surface, causing the slag near the strip to move away from or maintain a certain distance from the strip, thus achieving the effect of removing the slag. Therefore, based on the above considerations, under the background of energy conservation and emission reduction, choosing the appropriate slag removal method while achieving the slag removal effect, thereby minimizing energy consumption and equipment lifespan, has become an urgent technical problem to be solved. Summary of the Invention

[0006] The purpose of this invention is to overcome the defects of the prior art and provide a device for removing slag from hot-dip galvanized zinc pots that ensures slag removal efficiency, significantly reduces equipment size, effectively replaces the original electromagnetic slag removal device, and has a simple structure.

[0007] The objective of this invention can be achieved through the following technical solutions:

[0008] A device for removing slag from a hot-dip galvanized zinc pot using air blowing is mounted on the zinc pot, which is also equipped with an air knife. The device further includes a pneumatic slag-removing device for blowing away slag around the air knife.

[0009] The pneumatic slag removal device includes: a shell, and a gas distribution pipe connected to the shell and a gas source respectively. The bottom of the shell has parallel gas duct side plates. The shell has a gas chamber connected to the gas distribution pipe. Multiple air blowing ports are perforated on the lower surface of the gas chamber, and a guide plate is rotatably connected to each air blowing port. The guide plates are vertically arranged between the gas duct side plates.

[0010] The bottom of the housing is also provided with an air blowing direction adjustment component, which includes: a worm, a worm wheel meshing with the worm, and multiple driven wheels that are synchronously connected to the worm wheel. The worm wheel and the driven wheels are respectively connected to the corresponding guide plates, so that the tilt angle of multiple guide plates can be synchronously adjusted by rotating the worm to control the air blowing direction.

[0011] Furthermore, multiple pneumatic slag removal devices are provided and are installed horizontally or vertically inside the zinc pot.

[0012] Furthermore, the tilt angle of the guide plate is 5-85°.

[0013] Furthermore, the guide plate is located on both sides of the air inlet.

[0014] Furthermore, a pair of guide plates at the air inlet and the airway side plates on both sides form an air blowing channel, and the number of such air blowing channels is 5-25.

[0015] Furthermore, the type of the air blowing channel is either a straight-through type or a Raoult tube type.

[0016] Furthermore, multiple air blowing channels connected by the same connecting rod constitute an air blowing channel group, and the pneumatic slag removal device is equipped with 2-8 air blowing channel groups.

[0017] Furthermore, the connecting rod and the worm gear, and the connecting rod and the driven wheel are respectively eccentrically connected to the worm gear or the driven wheel via corresponding rotating shafts.

[0018] Furthermore, in the pneumatic slag removal device, the number of driven wheels is 16-96.

[0019] Furthermore, the pneumatic slag removal device is provided with multiple gas distribution pipes along its length.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] (1) The present invention arranges several horizontal and vertical pneumatic slag removal devices on the upper surface of the zinc pot. Through the synergistic effect of the pneumatic slag removal devices, the purpose of removing slag from the zinc pot surface is achieved, reducing manual labor. This is of great significance and value for improving the automation level and production efficiency of the zinc pot.

[0022] (2) The present invention can achieve slag removal under non-contact conditions, and the gas blown in can form a protective gas film on the surface of the zinc pot, thereby reducing the secondary oxidation of the zinc liquid.

[0023] (3) The present invention can replace the original electromagnetic slag removal device, realize air blowing and slag removal in different positions and areas of the zinc pot, and greatly reduce the operating space and energy consumption.

[0024] (4) The present invention uses worm gear and connecting rod transmission to control the direction of the guide plate, so that the guide plate can be fixed at different tilt angles while having the advantages of compact structure and easy operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an overall zinc pot gas-gathering and slag-removing device according to the present invention;

[0026] Figure 2 This is a partial enlarged view of the air knife in the zinc pot gas-gathering slag-removing device of the present invention;

[0027] Figure 3 This is a three-dimensional schematic diagram of a gas-gathering slag-removing device according to the present invention;

[0028] Figure 4 This is a cross-sectional view of an aerosol-gathering slag-removing device according to the present invention;

[0029] Figure 5This is a cross-sectional view of a unidirectional straight-through type guide plate pneumatic slag removal device in Example 1;

[0030] Figure 6 This is a cross-sectional view of a unidirectional Raoult tube type guide plate pneumatic slag removal device in Example 2;

[0031] Figure 7 This is a cross-sectional view of a bidirectional straight-through type guide plate pneumatic slag removal device in Example 3;

[0032] Numbering on the map:

[0033] 1-Zinc pot, 2-Furnace nose, 3-Strip steel, 4-Pneumatic slag removal device, 5-Air inlet, 6-Shell, 7-Gas distribution pipe, 8-Worm gear, 9-Worm wheel, 10-Connecting rod, 11-Driven wheel, 12-Shaft, 13-Guide plate, 14-Gas chamber, 15-Air knife, 16-Gas passage side plate Figure 1 , 2 The direction of the dashed line indicates the airflow direction. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] Unless otherwise specified in this technical solution, the component model, material name, connection structure, control method, and other features are considered to be common technical features disclosed in the prior art.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0037] In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the term "connection," etc., should be interpreted broadly; for example, it can refer to a fixed connection, a detachable connection, or an integrated connection; it can refer to a bolted connection or a welded connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] A device for removing slag from hot-dip galvanized pans using air blowing, such as... Figure 1 As shown, it includes: a zinc pot 1, and a pneumatic slag removal device 4 installed on the zinc pot 1.

[0039] Pneumatic slag removal device 4, such as Figure 3 and4 As shown, it includes: a housing 6, and a gas distribution pipe 7 connected to the housing 6. The gas distribution pipe 7 has an air inlet 5. The housing 6 has a gas storage chamber 14 inside.

[0040] The air chamber 14 has air passage side plates 16 on opposite sides of its lower end face, and multiple air blowing ports are opened on the lower end face of the air chamber 14. Each air blowing port is equipped with a guide plate 13 rotatably connected by a rotating shaft 12. The air passage side plates 16 are arranged perpendicularly to the guide plates 13.

[0041] In some specific embodiments, guide vanes 13 are provided on both sides of the air inlet.

[0042] The bottom of the housing 6 of the pneumatic slag removal device 4 is also equipped with a drive assembly, which includes a worm gear 8 and a worm wheel 9 meshing with the worm gear 8. The worm wheel 9 is rotatably connected to the rotating shaft 12. The rotating shaft 12 is driven by the self-locking characteristics of the worm gear 8 and the worm wheel 9, thereby controlling the tilt angle of the guide plate 13. The guide plate 13 can be tilted at a certain angle to change the direction of the airflow, thereby adjusting the area of ​​the pneumatic slag removal zone and the effect of pneumatic slag removal. The worm wheel 9 is also synchronously connected to multiple driven wheels 11 through a connecting rod 10.

[0043] In some specific embodiments, the connecting rod 10 is eccentrically connected to the worm gear 9 and the driven wheel 11 via corresponding rotating shafts.

[0044] The zinc pot 1 is equipped with a furnace nose 2, a steel strip 3, and an air knife 15 (e.g., Figure 2 As shown, after the strip steel 3 is immersed in the galvanizing solution, nitrogen gas is sprayed onto the surface of the strip steel 3 on the zinc pot through the air knife 15, thereby uniformly adjusting the weight of the zinc layer on the surface of the strip steel 3, so as to make the thickness of the galvanized layer on the surface of the galvanized strip steel 3 uniform, and producing zinc dross on both sides of the air knife 15.

[0045] In some specific embodiments, the airflow emanating from the pneumatic slag removal device 4 acts on the slag on the zinc pot surface, and under the synergistic effect of the pneumatic slag removal device 4, forms an airflow slag removal area that is interconnected with the area of ​​the air jet flow of the air knife 15 in the zinc pot 1. Specifically, multiple pneumatic slag removal devices 4 are provided, which are installed horizontally or vertically in the zinc pot 1. More specifically, pneumatic slag removal devices 4 are provided on both sides of the air knife 15 in the horizontal direction to blow the slag on both sides of the air knife 15 to both sides in the vertical direction. At the same time, pneumatic slag removal devices 4 are also provided on both sides of the air knife 15 in the vertical direction to further blow the slag to the rear of the furnace nose 2.

[0046] In some specific embodiments, the pneumatic slag removal device 4 is provided with a plurality of gas distribution pipes 7 along its length, so that the gas is evenly distributed along the length of the pneumatic slag removal device 4 and the impact on the device is reduced. Preferably, the number of gas distribution pipes 7 is 1 to 10.

[0047] Considering that different sizes of pneumatic slag removal devices require different driving forces, and to provide sufficient torque to allow the guide plate to tilt to a specified angle, the following configuration is adopted. This embodiment can limit the number of worm gear 8, worm wheel 9, connecting rod 10, and driven wheel 11 to ensure normal operation of the device.

[0048] In some specific embodiments, the number of worm gears 8 and worm wheels 9 is 1-4.

[0049] In some specific embodiments, a pair of guide plates 13 at the air inlet and the airway side plates 16 on both sides form an air blowing channel, and the number of such air blowing channels is preferably 5 to 25.

[0050] In some specific embodiments, the air blowing channel is of the straight-through type (e.g., Figure 5 (as shown) or Raoult type (such as) Figure 6 One of them (as shown).

[0051] In some specific embodiments, the inclination directions of the guide plates 13 are the same or opposite, so that the air blowing direction of the pneumatic slag removal device 4 is unilateral air blowing or bilateral air blowing (e.g. Figure 7 (As shown).

[0052] In some specific embodiments, the tilt angle of the guide plate 13 is 5 to 85°.

[0053] In some specific embodiments, multiple air blowing channels constitute an air blowing channel group, which is uniformly controlled by the connecting rod 10. Preferably, each pneumatic slag removal device 4 is equipped with 2-8 air blowing channel groups.

[0054] In some specific embodiments, the number of driven wheels 11 is 16 to 96.

[0055] In some specific embodiments, the intake pressure of the air inlet 5 is 0.5–10 MPa, and the gas flow rate is 10–50 m³ / h. 3 / h; the gas blown in through the air inlet 5 can be any of compressed air, nitrogen, argon, carbon dioxide or other inert gases.

[0056] The above implementation methods will be described in more detail below with reference to specific embodiments.

[0057] Example 1

[0058] This embodiment provides a device for removing slag from the surface of hot-dip galvanized pans using air blowing, the structure of which is as follows: Figure 1 As shown,

[0059] In this embodiment, four pneumatic slag removal devices 4 are installed above the zinc pot 1. There are two horizontal pneumatic slag removal devices 4 installed on the front and rear sides of the air knife 15, and two vertical pneumatic slag removal devices 4 installed on the left and right sides of the air knife 15.

[0060] A gas pressure of 3 MPa and a gas flow rate of 20 m³ / h are blown into each gas distribution pipe 7. 3 / h of preheated argon gas enters the gas chamber 14 through three gas distribution pipes 7. Finally, the airflow gushing out from the pneumatic slag removal device 4 acts on the slag on the zinc pot 1 (the gap between the guide plates is the airflow outlet), and works in conjunction with the air knife 15 to form an airflow slag removal zone, thereby driving the slag on the zinc pot 1 to move towards the rear of the furnace nose 2.

[0061] In this embodiment, the pneumatic slag removal device 4, such as Figure 5 As shown, there are 16 rotating shafts 12 and 16 guide plates 13. The guide plate 13 has an inclination angle of 30° and 20 openings, adopting a straight-through type and a single-sided opening.

[0062] The air-blowing device for removing slag from hot-dip galvanized pans provided in this embodiment is used as follows:

[0063] (1) Based on the actual working conditions, determine the appropriate gas blowing direction and select the optimal tilt angle of the guide plate 13.

[0064] (2) Rotating the worm 8 causes the driving force to be input into the transmission mechanism through the worm 8 and the worm wheel 9. The guide plate 13 and the worm wheel 9 are rotatably connected through the rotating shaft 12. Through the self-locking performance of the worm 8 and the worm wheel 9, the guide plate 13 is controlled to be at the optimal tilt angle. Then, it is distributed to several driven wheels 11 through the connecting rod 10. After that, the torque on the worm wheel 9 and the driven wheels 11 is transmitted to the rotating shaft 12 to control all guide plates 13 to rotate to the optimal tilt angle.

[0065] (3) Compressed gas enters the gas chamber 14 from the air inlet 5 through the gas distribution pipe 7 and acts on the zinc pot slag along the direction of the guide plate 13, so that the gas in the gas chamber 14 can stably act on the designated zinc liquid surface in the required direction, thereby achieving the purpose of driving away the zinc pot slag.

[0066] This embodiment achieves directional removal of slag from the zinc pot by means of the coordinated action of multiple pneumatic slag removal devices 4. It has a simple structure, is easy to process, and has low energy consumption.

[0067] Example 2

[0068] This embodiment provides a device for removing slag from hot-dip galvanized zinc pots by blowing air. The difference from the embodiment is the setting of the guide plate 13 in the pneumatic slag removal device 4. All other aspects are the same as in embodiment 1.

[0069] In this embodiment, the pneumatic slag removal device 4 is as follows: Figure 6 As shown, there are 16 rotating shafts 12 and 16 guide plates 13. The guide plates 13 are tilted at an angle of 30° and have 20 openings. They adopt Raoult tube type and single-sided opening to increase the blowing pressure acting on the surface of zinc pot 1.

[0070] This embodiment improves the efficiency of slag removal by changing the type of guide plate 13, thereby increasing the gas flow rate when exiting the guide plate. Its structure is simple and easy to process.

[0071] Example 3

[0072] This embodiment provides a device for removing slag from hot-dip galvanized zinc pots by blowing air. The difference from the embodiment is the setting of the guide plate 13 in the pneumatic slag removal device 4. All other aspects are the same as in embodiment 1.

[0073] In this embodiment, the pneumatic slag removal device 4 is as follows: Figure 7 As shown, there are 16 rotating shafts 12 and 16 guide plates 13. The transverse guide plates 13 are of the type with an inclination angle of 30° and 20 openings, including straight-through and double-sided openings, which cause the slag on both sides of the strip 3 to converge towards the edge of the zinc pot 1. The longitudinal guide plates 13 are of the type with an inclination angle of 30° and 30 openings, including straight-through and single-sided openings, which enable the slag gathered at the edge of the zinc pot 1 to move towards the rear of the furnace nose 2.

[0074] This embodiment can prevent the accumulation of slag by changing the opening direction of the guide plate 13, which greatly improves the efficiency of slag removal. Its structure is simple and easy to process.

[0075] In summary, the above-described embodiment of the air-blowing device for removing slag from the hot-dip galvanized zinc pot 1 utilizes multiple pneumatic slag-removing devices 4 installed above the zinc pot 1. The airflow from these devices acts on the slag on the zinc pot surface, and under the synergistic effect of the devices, forms an airflow slag-removing zone that connects with the area affected by the air knife jet, thereby driving the slag away from the strip steel 3 and towards the rear of the furnace nose 2. The reasonable arrangement of the gas distribution pipes 7 in the gas-gathering device ensures that the compressed gas is evenly distributed to the guiding device. In the guiding device, the driving force is input to the transmission mechanism via the worm gear 8 and worm wheel 9, and then distributed to several driven wheels 11 via the connecting rod 10. The torque on the worm wheel 9 and driven wheels 11 is then transmitted to the rotating shaft 12, thereby controlling all guide plates 13 to rotate to a specified tilt angle.

[0076] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A device for removing slag from a hot-dip galvanized zinc pot by blowing air, disposed on a zinc pot (1), wherein the zinc pot (1) is further provided with an air knife (15), characterized in that, The device includes a pneumatic slag removal device (4) for blowing away surface slag around the air knife (15). The pneumatic slag removal device (4) includes: a shell (6) and a gas distribution pipe (7) connected to the shell (6) and a gas source respectively. The bottom of the shell (6) is provided with air passage side plates (16) side by side. The shell (6) is provided with an air chamber (14) connected to the gas distribution pipe (7). Multiple air blowing ports are opened through the lower end face of the air chamber (14). Each air blowing port is rotatably connected to a guide plate (13). The guide plate (13) is vertically arranged between the air passage side plates (16). The bottom of the housing (6) is also provided with an air blowing direction adjustment component. The air blowing direction adjustment component includes: a worm (8), a worm wheel (9) meshing with the worm (8), and a plurality of driven wheels (11) that are synchronously connected to the worm wheel (9). The worm wheel (9) and the driven wheels (11) are respectively connected to the corresponding guide plates (13) for transmission, so that the tilt angle of the plurality of guide plates (13) can be synchronously adjusted by rotating the worm (8) to control the air blowing direction.

2. The apparatus for removing slag from hot-dip galvanized pans using air blowing according to claim 1, characterized in that, Multiple pneumatic slag removal devices (4) are provided and are installed horizontally or vertically inside the zinc pot (1).

3. The apparatus for removing slag from hot-dip galvanized zinc pans by air blowing according to claim 1, characterized in that, The tilt angle of the guide plate (13) is 5-85°.

4. The apparatus for removing slag from hot-dip galvanized pans using air blowing according to claim 1, characterized in that, The guide plate (13) is located on both sides of the air inlet.

5. The apparatus for removing slag from hot-dip galvanized pans using air blowing according to claim 3, characterized in that, The pair of guide plates (13) at the air inlet and the airway side plates (16) on both sides form an air blowing channel, and the number of such air blowing channels is 5-25.

6. The apparatus for removing slag from hot-dip galvanized zinc pans by air blowing according to claim 5, characterized in that, The air blowing channel is either a straight-through type or a Raoult tube type.

7. The apparatus for removing slag from hot-dip galvanized zinc pans by air blowing according to claim 5, characterized in that, Multiple air blowing channels connected by the same connecting rod (10) form an air blowing channel group, and the pneumatic slag removal device (4) is equipped with 2-8 air blowing channel groups.

8. The apparatus for removing slag from hot-dip galvanized zinc pans by blowing air, as described in claim 7, is characterized in that... The connecting rod (10) and the worm gear (9), and the connecting rod (10) and the driven wheel (11) are respectively eccentrically connected to the worm gear (9) or the driven wheel (11) through corresponding rotating shafts.

9. The apparatus for removing slag from hot-dip galvanized zinc pans by air blowing according to claim 1, characterized in that, In the pneumatic slag removal device (4), the number of driven wheels (11) is 16-96.

10. The apparatus for removing slag from hot-dip galvanized zinc pans by air blowing according to claim 1, characterized in that, The pneumatic slag removal device (4) is provided with multiple gas distribution pipes (7) along its length.

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