A blowing device for removing residual emulsion on the surface of a cold-rolled strip

Abstract

The application discloses a kind of for removing the blowing device of residual emulsion on the surface of cold-rolled strip steel, belong to cold-rolled strip steel production equipment technical field;Including being arranged in the upper and lower guide plates of strip steel running path.The upper guide plate is equipped with upper blowing unit, and multiple blowing nozzles are obliquely arranged along the width direction of strip steel, and the jetting pressure of nozzle is gradually decreased from the center of strip steel to both sides by gas regulating system, effectively removes residual edge part.The lower guide plate is equipped with lower cleaning unit, including suction port and vacuum generator connected below, remove liquid drop on the lower surface of strip steel by negative pressure suction method, avoid liquid drop drop and secondary pollution.The application adopts the asymmetric cleaning mode of upper surface gradient pressure blowing and lower surface negative pressure suction combination, significantly improves cleaning uniformity and thoroughness, optimizes energy consumption at the same time, solves the problem of edge residual and lower surface pollution in traditional blowing technology.

Description

Technical Field

[0001] This invention relates to the technical field of cold-rolled strip steel production equipment, specifically to a purging device for removing residual emulsion from the surface of cold-rolled strip steel. Background Technology

[0002] If the emulsion remaining on the surface of the strip steel after rolling is not thoroughly removed on a cold-rolled strip steel production line, it will seriously affect the product quality of subsequent processes, such as causing annealing oil spots, surface color differences, or even rust. Therefore, it is crucial to install an efficient purging device at the mill exit.

[0003] Currently, the commonly used technology involves symmetrically arranging compressed air nozzles or air knives above and below the strip for blowing. For example, Chinese patent CN222817625U discloses a strip edge blowing device, focusing on adjustable blowing of the edges. Chinese patent CN222288357U discloses an adjustable leveling machine blowing structure. However, existing technologies still have significant shortcomings: First, residual liquid tends to accumulate on the upper surface of the strip, especially in the corner areas, making it difficult to effectively remove these "edge residues" with uniform pressure blowing. Second, when blowing the lower surface of the strip with upward airflow, the dispersed droplets are prone to dripping and splashing under gravity, causing equipment contamination or secondary contamination of the strip, resulting in unsatisfactory cleaning effects. Finally, relying entirely on high-pressure gas blowing consumes a lot of energy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a purging device for removing residual emulsion from the surface of cold-rolled strip steel that provides a more uniform and thorough cleaning effect, effectively solves the problems of edge residue and lower surface dripping, and has relatively low energy consumption.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A purging device for removing residual emulsion from the surface of cold-rolled strip steel includes a frame, an upper guide plate and a lower guide plate respectively disposed on the frame and located above and below the strip steel running path, and an upper purging unit disposed below the upper guide plate. The upper purging unit includes multiple purging nozzles and an air supply regulation system. The multiple purging nozzles are fixed to the upper guide plate along the width direction of the strip steel and are obliquely arranged toward the upper surface of the strip steel. The air supply regulation system supplies compressed air to the multiple purging nozzles and makes the spray pressure of the purging nozzles at different positions along the width direction of the strip steel decrease from the center area of ​​the strip steel to the two side edge areas.

[0007] A lower cleaning unit is provided on the lower guide plate; the lower cleaning unit includes a suction port opened on the lower guide plate and a vacuum generator fixed below the suction port; the vacuum generator is used to generate negative pressure at the suction port.

[0008] Furthermore, the upper guide plate is equipped with multiple independent air supply chambers, each arranged along the width direction of the strip, and each air supply chamber is provided with at least one row of the purging nozzles; the air supply regulation system includes multiple independently controlled air pressure regulating valves, each air pressure regulating valve being connected to one of the air supply chambers to regulate the air supply pressure in each air supply chamber; this allows the operator to flexibly and accurately set the purging pressure in different areas along the width direction according to the actual production process and strip specifications, thereby more reliably realizing a purging mode with pressure decreasing from the center to the edge, improving the adaptability and effectiveness of removing emulsion residues from the upper surface of the strip, especially in the edge area.

[0009] Furthermore, the spray direction of the purging nozzle forms an acute angle with the upper surface of the strip and is opposite to the running direction of the strip; increasing the relative speed and contact time between the airflow and the strip surface helps to more fully peel off and purge the residual emulsion in the opposite direction of the running direction, enhancing the cleaning effect of a single purging and improving the fluid peeling efficiency.

[0010] Furthermore, the purging nozzle is a slit-type nozzle; the slit-type nozzle can generate a high-speed airflow curtain with a wider coverage area and a flatter shape. This airflow pattern helps to form a continuous and uniform purging coverage area on the strip surface, reducing the possibility of airflow interference or omission, thereby improving the uniformity and continuity of the purging coverage and facilitating the complete removal of the emulsion film.

[0011] Furthermore, the suction port is a narrow, elongated opening extending along the width direction of the strip. The narrow, elongated opening design can better match the width and shape of the strip, forming a continuous negative pressure suction area on the lower surface of the strip in the width direction, ensuring a more comprehensive suction coverage, reducing blind spots, and enhancing the overall suction cleaning effect.

[0012] Furthermore, the vacuum generator is a venturi tube type vacuum generator, whose driving air source is connected to the compressed air pipeline of the air supply regulation system. The venturi tube type vacuum generator has a simple and reliable structure and can efficiently generate negative pressure using compressed air. It is driven by the existing air source system of the device, without the need to add a complex vacuum pump system, which simplifies the overall device structure, facilitates the integration and maintenance of the equipment, and ensures the stable operation of the negative pressure suction function.

[0013] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0014] This invention significantly improves cleaning efficiency by incorporating asymmetrical functional units in the upper and lower guide plate areas. For the upper surface of the strip, the upper blowing unit employs a gradient pressure design of "high pressure in the center and low pressure at the edges," specifically enhancing the blowing force in the easily residue-prone edge areas while avoiding over-blowing in the central area. This achieves precise and uniform cleaning, effectively eliminating edge residue. For the lower surface of the strip, the device innovatively uses a lower cleaning unit with a suction port and a vacuum generator, replacing the traditional upward blowing method. This directly creates a negative pressure zone on the lower surface of the strip, sucking away residual droplets. This effectively avoids the dripping and splashing of blown-out droplets under gravity, preventing secondary pollution and equipment contamination. The cleaning method is more direct and reliable. Simultaneously, the upper blowing unit optimizes airflow distribution through pressure gradients, reducing unnecessary energy consumption. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0016] Figure 2 This is a top view of the upper purging unit in an embodiment of the present invention.

[0017] Figure 3 This is a top view of the lower cleaning unit in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 1. Strip steel; 2. Upper guide plate; 3. Lower guide plate; 4. Upper purging unit; 5. Lower cleaning unit; 6. Hoses; 41. Air supply chamber; 42. Purging nozzle; 51. Vacuum generator. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0020] See Figures 1-3 A purging device for removing residual emulsion from the surface of cold-rolled strip steel 1 includes a frame, an upper guide plate 2 and a lower guide plate 3 respectively disposed on the frame and located above and below the running path of the strip steel 1. An upper purging unit 4 is disposed below the upper guide plate 2. The upper purging unit 4 includes multiple purging nozzles 42 and an air supply regulation system. The multiple purging nozzles 42 are fixed to the upper guide plate 2 along the width direction of the strip steel 1 and are obliquely arranged toward the upper surface of the strip steel 1. The air supply regulation system supplies compressed air to the multiple purging nozzles 42 and makes the spray pressure of the purging nozzles 42 at different positions along the width direction of the strip steel 1 decrease from the central area of ​​the strip steel 1 to the two side edge areas.

[0021] A lower cleaning unit 5 is provided on the lower guide plate 3; the lower cleaning unit 5 includes a suction port opened on the lower guide plate 3 and a vacuum generator 51 fixed below the suction port; the vacuum generator 51 is used to generate negative pressure at the suction port.

[0022] The upper guide plate 2 is equipped with multiple independent air supply chambers 41, which are arranged along the width direction of the strip 1. Each air supply chamber 41 is provided with at least one row of the blowing nozzles 42. The air supply regulation system includes multiple independently controlled air pressure regulating valves, each of which is connected to one of the air supply chambers 41 to regulate the air supply pressure in each air supply chamber 41. This allows the operator to flexibly and accurately set the blowing pressure in different areas along the width direction according to the actual production process and the specifications of the strip 1, thereby more reliably realizing the blowing mode with pressure decreasing from the center to the edge, and improving the adaptability and effectiveness of removing emulsion residues from the upper surface of the strip 1, especially in the edge area.

[0023] The spraying direction of the purging nozzle 42 forms an acute angle with the upper surface of the strip 1, and the spraying direction is opposite to the running direction of the strip 1; increasing the relative speed and contact time between the airflow and the surface of the strip 1 helps to more fully peel off and purge the residual emulsion in the opposite direction of running, strengthens the cleaning effect of a single purge, and improves the fluid peeling efficiency.

[0024] The purging nozzle 42 is a flat slit nozzle; the flat slit nozzle can generate a high-speed airflow curtain with a wide coverage area and a relatively flat shape. This airflow pattern helps to form a continuous and uniform purging coverage area on the surface of the strip steel 1, reducing the possibility of airflow interference or omission, thereby improving the uniformity and continuity of the purging coverage, which is conducive to the complete removal of the emulsion film.

[0025] The suction port is a narrow, elongated opening extending along the width of the strip 1. The narrow, elongated opening design can better match the width and shape of the strip 1, forming a continuous negative pressure suction area on the lower surface of the strip 1 in the width direction, ensuring a more comprehensive suction coverage, reducing blind spots, and enhancing the overall suction cleaning effect.

[0026] The vacuum generator 51 is a venturi tube type vacuum generator, and its driving air source is connected to the compressed air pipeline of the air supply regulation system through the hose 6. The venturi tube type vacuum generator has a simple and reliable structure and can efficiently generate negative pressure using compressed air. It is driven by the existing air source system of the device, without the need to add a complicated vacuum pump system, which simplifies the overall device structure, facilitates the integration and maintenance of the equipment, and ensures the stable operation of the negative pressure suction function.

[0027] During the production of cold-rolled strip steel 1, as the strip steel 1 passes through this purging device along its running path after exiting the mill, the residual emulsion on its surface is first treated by the upper purging unit, which employs a gradient pressure design. This unit effectively solves the problem of "edge residue" accumulating at the corners, which is difficult to remove with traditional uniform purging. The upper purging unit 4, through an air supply regulation system and multiple independently controlled air supply chambers 41, sprays compressed air at a decreasing injection pressure from the center area to the two edge areas. This air is then obliquely blown out through multiple flat-slit nozzles facing the upper surface of the strip steel 1 and in the opposite direction to the running direction of the strip steel 1. This gradient purging mode, which involves high-pressure impact stripping at the center and targeted low-pressure continuous removal at the edges, avoids energy waste caused by excessive purging in the center area. At the same time, the wide, flat airflow curtain formed by the flat-slit nozzles and the increased energy from the reverse injection are also addressed. By increasing the relative contact time, the entire upper surface of the strip 1, especially the edge areas where residue is prone to occur, is ensured to achieve uniform, continuous, and efficient emulsion stripping and blowing. At the same time, for the lower surface of the strip 1, the device innovatively adopts a lower cleaning unit 5, which fundamentally overcomes the drawbacks of traditional upward airflow purging, which causes secondary pollution and equipment contamination due to droplets falling and splashing due to gravity. The narrow suction port extending along the width direction of the strip 1 on the lower guide plate 3 works in conjunction with the venturi tube vacuum generator 51 connected below it. Driven by compressed air from the same air supply system, a continuous and stable negative pressure zone is formed within the width range of the lower surface of the strip 1, directly sucking away residual and potentially dripping emulsion droplets. This achieves reliable cleaning and splash-free treatment of the lower surface of the strip 1, which not only significantly improves the cleaning effect but also optimizes the overall energy consumption.

[0028] This invention significantly improves cleaning efficiency by incorporating asymmetrical functional units in the upper and lower guide plate areas. For the upper surface of the strip, the upper blowing unit employs a gradient pressure design of "high pressure in the center and low pressure at the edges," specifically enhancing the blowing force in the easily residue-prone edge areas while avoiding over-blowing in the central area. This achieves precise and uniform cleaning, effectively eliminating edge residue. For the lower surface of the strip, the device innovatively uses a lower cleaning unit with a suction port and a vacuum generator, replacing the traditional upward blowing method. This directly creates a negative pressure zone on the lower surface of the strip, sucking away residual droplets. This effectively avoids the dripping and splashing of blown-out droplets under gravity, preventing secondary pollution and equipment contamination. The cleaning method is more direct and reliable. Simultaneously, the upper blowing unit optimizes airflow distribution through pressure gradients, reducing unnecessary energy consumption.

[0029] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A purging device for removing residual emulsion from the surface of cold-rolled strip steel, comprising a frame, an upper guide plate and a lower guide plate respectively disposed on the frame above and below the strip steel running path, characterized in that: Below the upper guide plate, an upper purging unit is provided. The upper purging unit includes multiple purging nozzles and an air supply regulation system. The multiple purging nozzles are fixed to the upper guide plate along the width direction of the strip and are obliquely arranged toward the upper surface of the strip. The air supply regulation system supplies compressed air to the multiple purging nozzles and makes the spray pressure of the purging nozzles at different positions along the width direction of the strip decrease from the center area of ​​the strip to the two side edge areas. A lower cleaning unit is provided on the lower guide plate; the lower cleaning unit includes a suction port opened on the lower guide plate and a vacuum generator fixed below the suction port; the vacuum generator is used to generate negative pressure at the suction port.

2. The purging device for removing residual emulsion from the surface of cold-rolled strip steel according to claim 1, characterized in that: The upper guide plate is equipped with multiple independent air supply chambers, each air supply chamber is arranged along the width direction of the strip, and each air supply chamber is provided with at least one row of the blowing nozzles; the air supply regulation system includes multiple independently controlled air pressure regulating valves, each air pressure regulating valve is respectively connected to one of the air supply chambers to regulate the air supply pressure in each air supply chamber.

3. The purging device for removing residual emulsion from the surface of cold-rolled strip steel according to claim 1 or 2, characterized in that: The spraying direction of the purging nozzle forms an acute angle with the upper surface of the strip, and the spraying direction is opposite to the running direction of the strip.

4. The purging device for removing residual emulsion from the surface of cold-rolled strip steel according to claim 3, characterized in that: The purging nozzle is a flat slit nozzle.

5. The purging device for removing residual emulsion from the surface of cold-rolled strip steel according to claim 1, characterized in that: The suction port is a narrow, elongated opening extending along the width of the strip.

6. The purging device for removing residual emulsion from the surface of cold-rolled strip steel according to claim 1 or 5, characterized in that: The vacuum generator is a venturi tube type vacuum generator, and its driving gas source is connected to the compressed air pipeline of the gas supply regulation system.

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