A slag removal device for improving the quality of hot-dip galvanized coating

Abstract

The present invention provides a slag removal device for improving the quality of hot-dip galvanized coating, comprising a roller beam, a roller arm, a front stabilizing roller and a rear stabilizing roller, wherein the roller beam and the roller arm are connected through a nozzle cavity, and the nozzle cavity comprises a plurality of connected nozzle bodies and a detachable cavity. The present invention adopts a pneumatic screening method to spray zinc slag to a place far away from both sides of the strip steel, thereby reducing the frequency of slag removal operations, and only needs to clean around the auxiliary equipment in the zinc pot, thereby improving the efficiency of slag removal and slag scooping, reducing the time for personnel to work at the zinc pot, reducing labor intensity, and improving personnel safety. In addition, the present invention preferentially uses nitrogen, which is more conducive to preventing the oxidation of slag on the surface of the zinc pot liquid and improving the quality of zinc liquid.

Description

Technical Field

[0001] The invention specifically relates to a slag discharge device for improving the quality of hot-dip galvanizing coating, and relates to a roller beam for discharging slag on the liquid surface of a slag-discharging zinc pot in a hot-dip galvanizing production line. Background Art

[0002] In the continuous hot-dip galvanizing production line, the zinc slag blown off by the air knife during production, the cooling zinc slag produced by the cooling zinc liquid, and the zinc slag due to oxidation gather on both sides of the strip. During production, the zinc slag flows downward along the air knife pressure spraying direction. The zinc slag on both sides of the strip gathers on both sides of the strip, which requires manual slag removal and cleaning in time. The cleaning frequency depends on the distance between the zinc slag and the strip and the amount produced. Failure to clean in time will affect product quality, bring zinc slag onto the surface of the strip, and cause product degradation.

[0003] The slag on the surface of the zinc pot is generally on both sides of the strip, below the air knife and the roller beam. The zinc slag in these two places is generally cleaned manually with slag scraping tools, which is labor-intensive. When the personnel are working, the slag scraping tools are easy to touch the strip, causing quality degradation and safety accidents. The normal temperature of the zinc liquid in the zinc pot is between 450-660℃, which is a high-temperature liquid metal. The heat waves generated by the heat exchange between the flowing zinc liquid and the gas blown by the air knife and the strip have thermal radiation damage to the bodies of the personnel working here. The working ability of personnel working under high temperature decreases with the extension of working time, and they are more likely to get tired, their physical functions decline, and their body coordination ability declines during work. There are certain safety risks in cleaning zinc slag at the rotating part of the roller.

[0004] Slag on the surface of the zinc pot is continuously generated during production, especially when it is concentrated on the edge of the strip. When thick specifications are produced, the production line speed is low, and the air knife pressure is low, the distance between the zinc slag and the strip is close or the edges are connected, which makes it more likely to produce zinc slag defects.

[0005] During the slag removal process, the zinc ingots added in the zinc pot need to be lifted out of the zinc pot to prevent shrinkage or explosion of zinc ingots due to quality problems, and splashing of zinc liquid to scald the operators. Stop adding zinc ingots during the period when the zinc ingots are lifted out of the zinc pot, which will cause fluctuations in the liquid level of the zinc pot being produced and affect product quality. Frequent slag removal operations are also the main reason for the fluctuations in the zinc pot liquid level.

[0006] The slag on the surface of the zinc pot close to the strip will also cause the zinc slag blown down by the air knife to splash onto the liquid surface, and the zinc slag will rebound and adhere to the surface of the strip, forming zinc slag defects. In severe cases, the zinc slag will also splash onto the lip of the air knife or the inside of the lip, causing blockage of the air knife. The zinc slag is blocked inside the air knife cavity or in the action path of the air flow on the lip, changing the direction of the air flow or blocking the flow of the air knife gas. The flowing zinc liquid on the surface of the strip cannot be normally scraped and blown by the air knife, which will cause serious air knife streak defects. Summary of the invention

[0007] In order to solve the current situation of zinc slag on the surface of zinc pot liquid and zinc slag floating on the surface of zinc liquid after cooling in the above-mentioned prior art, the present invention adopts a slag removal device for improving the quality of hot-dip galvanizing coating, which can continuously use a gas blowing device installed inside the zinc pot roller beam to treat the generated zinc slag. A plurality of combined and quickly detachable cavities and nozzles are installed inside the roller beam and fixed on the roller beam through a mounting bracket, and have a certain inclination angle, which is convenient for the rotation and adjustment of the nozzle to achieve a reasonable injection direction and angle. The surface slag floating on the surface of the zinc pot is moved to the edge of the zinc pot with the optimized pressure of the blowing gas, and the zinc slag is cleaned by manual or slag removal robot to maintain the purity of zinc liquid, reduce the defects of zinc slag on the surface of strip steel, and improve the quality of hot-dip galvanizing coating to meet quality requirements.

[0008] To this end, the present invention adopts the following technical solutions:

[0009] A slag removal device for improving the quality of hot-dip galvanized coating, comprising a roller beam, a roller arm, a front stabilizing roller and a rear stabilizing roller, wherein the roller beam and the roller arm are connected through a nozzle cavity, and the nozzle cavity comprises a plurality of connected nozzle bodies and a detachable cavity;

[0010] It also includes a mounting frame, the mounting frame is connected to the roller beam, and the nozzle body is fixed on the mounting frame;

[0011] It also includes an air intake duct, which is connected to the detachable cavity. The air intake duct is connected to the roller beam and extends to the outside of the roller beam for connecting to an external air supply source. The external air supply source enters the nozzle cavity through the air intake duct, is ejected after being constrained by the direction of the nozzle body, and acts on the zinc slag on the surface of the zinc liquid to provide optimized gas pressure to push the zinc slag to move, thereby achieving the purpose of slag discharge.

[0012] Furthermore, the nozzle spraying directions of the nozzle bodies are all arranged to be inclined downward, and are respectively connected to the inclined nozzle and the nozzle air inlet cavity.

[0013] Furthermore, the nozzle body is connected to the detachable cavity through a nozzle stopper, and the nozzle body can rotate along a contact reference surface with the detachable cavity.

[0014] Furthermore, the air intake duct is composed of an air intake cavity, a transition cavity, and an air supply cavity, and the air supply cavity is connected to the nozzle cavity.

[0015] Furthermore, the inclination angle of the inclined nozzle is 5°-85°.

[0016] The beneficial effects of the present invention are:

[0017] 1. The present invention adopts a pneumatic screening method to spray zinc slag to a place far away from both sides of the strip, reducing the frequency of slag removal operations. It only needs to clean around the auxiliary equipment in the zinc pot, improving the efficiency of slag removal and slag catching, reducing the time for personnel to work at the zinc pot, reducing labor intensity, and improving personnel safety. The priority use of nitrogen is more conducive to preventing the oxidation of slag on the surface of the zinc pot liquid and improving the quality of zinc liquid.

[0018] 2. In the present invention, the hot-dip galvanizing zinc pot roller beam is located on both sides of the upper and lower surfaces of the steel strip, and is located above the zinc slag accumulation. A spray beam with a nozzle device is installed below or to the side of the zinc pot roller beam, and the spraying direction is changed through the nozzle by the effect of gas pressure. Driven by the gas pressure, the zinc slag generated on the zinc pot liquid surface flows on the zinc liquid surface and away from the steel strip, thereby preventing the zinc slag from adhering to the upper and lower surfaces of the steel strip or the edge of the steel strip to produce zinc slag defects;

[0019] 3. In the present invention, the spray beam is parallel to the roller beam, and two spray beams are installed on both sides of the roller beam in the length direction. More nozzles can be installed more effectively and the maximum blowing effect can be achieved to drive away the zinc slag produced on the zinc liquid surface. In order to save space and not interfere with the original equipment, a spray beam with a small diameter is adopted. While ensuring the nozzle pressure, a square tube or a round tube can be used, or a thin-sheet spray beam structure can be used.

[0020] 4. In the present invention, the nozzle arrangement angle forms a certain angle with the zinc liquid surface. If the nozzle angle is too large or too small, the slag removal effect will be affected. In order to achieve a more ideal slag removal effect, a nozzle device with an adjustable angle is installed.

[0021] 5. The spray beam and the nozzle in the present invention are provided with a pressure detection device, which detects the nozzle pressure at all times to ensure the accuracy and stability of the nozzle pressure. Too large or too small nozzle angle pressure will affect the slag removal effect. Too large pressure will cause zinc liquid splashing accidents, while too small pressure will not have any slag removal effect or will have a small slag removal effect. In order to achieve a more ideal slag removal effect, a pressure regulating valve with adjustable pressure is installed.

[0022] 6. In the present invention, the nozzle pressure and the nozzle angle are adjusted according to the actual slag amount and speed generated by the production line, and the zinc slag on the zinc pot liquid surface is blown to the slag removal position of the zinc pot as much as possible, which is convenient for slag removal, improves the slag removal efficiency, and reduces the labor intensity of workers; of course, it is more conducive to slag discharge and cleaning in a production site equipped with an automatic zinc pot slag removal robot. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the front view of the stabilizing roller slag discharge device;

[0024] Figure 2 This is a top view of the stable roller slag discharge device;

[0025] Figure 3 This is a side view of the stabilizing roller slag discharge device;

[0026] Figure 4 This is an axonometric view of the stable roller slag discharge device;

[0027] Figure 5 This is the main view of the air intake duct;

[0028] Figure 6 This is a top view of the air intake duct;

[0029] Figure 7 It is the side view of the air intake duct;

[0030] Figure 8 It is an axonometric view of the air intake duct;

[0031] Fig. 9 It is an axonometric view of the nozzle body and the detachable chamber;

[0032] Fig.10 It is the front view of the nozzle;

[0033] Fig.11 is a top view of the nozzle;

[0034] Fig.12 is a side view of the nozzle;

[0035] Fig.13 It is the nozzle axonometric;

[0036] In the figure, 1-stabilizing roller slag discharge device, 101-air inlet duct, 10101-air inlet chamber, 10102-transition chamber, 10103-air supply chamber, 102-stabilizing roller mounting hole, 103-detachable chamber, 104-nozzle body, 1041-inclined nozzle, 10411-inclined nozzle gas inlet port, 10412-inclined nozzle gas injection port, 1042-nozzle block, 1043-nozzle air inlet chamber, 105-mounting frame, 106-roller beam, 107-nozzle chamber, 2-roller arm, 201-rear stabilizing roller, 202-front stabilizing roller. DETAILED DESCRIPTION

[0037] The technical solution of the present invention is described below in conjunction with the accompanying drawings and implementation methods.

[0038] The present invention provides a slag removal device for improving the quality of hot dip galvanized coating. Figures 1 to 4 The three-view and axonometric drawings of the stabilizing roller slag discharge device are composed of a roller beam 106, a roller arm 2, a front stabilizing roller 202 and a rear stabilizing roller 201. One or more nozzle bodies 104 are connected to the detachable cavity 103. The combination of multiple connected nozzle bodies 104 and detachable cavity 103 constitutes a cavity with a semi-sealed structure, and the name of this cavity is defined as nozzle cavity 107.

[0039] The nozzle spraying direction of the nozzle body 104 is arranged to be inclined downward, and each assembly can be disassembled for maintenance or replacement separately. Multiple assemblies are fixed on the mounting frame 105, and the mounting frame 105 is connected to the roller beam 106. The air intake duct 101 is connected to the detachable cavity 103, and the air intake duct 101 is connected to the roller beam 106 and extends to the outside of the roller beam 106 for connecting to an external air supply source. The external air supply source enters the nozzle cavity 107 through the air intake duct 101, is ejected after being constrained by the direction of the nozzle body 104, and acts on the zinc slag on the surface of the zinc liquid to give optimized gas pressure to push the zinc slag to move, thereby achieving the purpose of slag discharge.

[0040] See attached Figures 5 to 8 The three views and axonometric view of the air intake duct show that the air intake duct 101 is a cavity with a flat structure and an S-shape when viewed from the side. It is mainly composed of three cavities, namely, an air intake cavity 10101, a transition cavity 10102, and an air supply cavity 10103. The air supply cavity 10103 is connected to the nozzle cavity 107. The S-shaped arrangement is mainly limited by the small internal space of the roller beam and the interference between the external connecting pipeline and the fixed position of the mounting base. This problem can be effectively solved by using the S-shaped air intake duct 101. In order to supply a stable airflow to the nozzle cavity 107 and allow the airflow to smoothly enter the interior of the nozzle cavity 107, a transition cavity 10102 is designed between the air intake cavity 10101 and the air supply cavity 10103 to achieve the stability of the airflow.

[0041] See attached Figures 9 to 13 The nozzle body 104 is mounted on the detachable cavity 103, and the detachable cavity 103 is mounted on the nozzle body 104. Fig. 9 It can be seen that, except for the end with one end open for connecting to other cavities, the other two ends are open connectors with concave and convex interfaces, which are convenient for connecting to each other and to the air intake duct 101, ensuring the smooth passage of external gas. The nozzle body 104 is connected to the inclined nozzle 1041 and the nozzle air intake cavity 1043 respectively. There is a protruding circular nozzle stopper 1042 in the middle part, which is connected to the detachable cavity 103 through the nozzle stopper 1042, and the detachable cavity 103 is used as the reference for installation to ensure that the nozzle is in the correct installation state. The nozzle body 104 can rotate along the contact reference surface 103, and the installation angle is selected according to the specific actual situation.

[0042] refer to Fig.10 The tilt angle of the tilted nozzle 1041 is 5°-85°, and the nozzle opening is contracted to improve the nozzle's ability to provide uniform and stable airflow to ensure uniform slag blowing, prevent zinc slag splashing, and ensure the stability of the zinc liquid level. In addition, the tilt angle of the tilted nozzle 1041 is determined by the on-site liquid level height and the nozzle length. The tilted nozzle 1041 should be as close to the liquid surface as possible to maximize the blowing effect.

[0043] The slag is evenly blown away by multiple array nozzles to eliminate the slag on the surface of the zinc pot and maintain an effective distance from the coated strip. The moving strip is surrounded by pure zinc liquid, which improves the surface quality of the product and prevents the generation of zinc slag or other defects that are unfavorable to zinc slag.

[0044] Continuous hot-dip galvanizing units generally use two front and rear roller beams to install stabilizing rollers to keep the strip in a straight state between the front and rear stabilizing rollers, so that it can pass through the air knife smoothly to obtain an excellent coating. A slag removal device to improve the quality of hot-dip galvanizing coating is also installed on each stabilizing roller. The nozzles of the front and rear slag removal devices are tilted in the opposite direction of the strip as a reference. The main purpose is to blow the slag away from the strip.

Claims

1. A slag removal device for improving the quality of hot-dip galvanized coating, characterized in that: It includes a roller beam, a roller arm, a front stabilizing roller and a rear stabilizing roller, wherein the roller beam and the roller arm are connected through a nozzle cavity, and the nozzle cavity includes a plurality of connected nozzle bodies and a detachable cavity; It also includes a mounting frame, the mounting frame is connected to the roller beam, and the nozzle body is fixed on the mounting frame; It also includes an air intake duct, which is connected to the detachable cavity, connected to the roller beam and extended to the outside of the roller beam, and is used to connect to an external air supply source. The external air supply source enters the nozzle cavity through the air intake duct, is ejected after being constrained by the direction of the nozzle body, and acts on the zinc slag on the surface of the zinc liquid to provide an optimized gas pressure to push the zinc slag to move, thereby achieving the purpose of slag discharge; The nozzle spraying direction of the nozzle body is tilted downward, one end of the nozzle body is provided with an inclined nozzle, and the other end is provided with a nozzle air inlet cavity, and the nozzle body is connected to the inclined nozzle and the nozzle air inlet cavity respectively; the tilt angle of the inclined nozzle is 5°-85°; A nozzle stopper is provided between the nozzle body and the nozzle air inlet cavity, the nozzle body is connected to the detachable cavity through the nozzle stopper, and the nozzle body can rotate along the contact reference surface with the detachable cavity; The air intake duct is composed of an air intake cavity, a transition cavity and an air delivery cavity, and the air delivery cavity is connected to the nozzle cavity.

Images