Galvanized steel strip drying device

Abstract

The utility model belongs to the technical field of steel belt galvanizing, and discloses a galvanized steel belt drying device which comprises a box body and a carrier roller assembly which is arranged in the box body in a rotating mode and used for conveying a steel belt, and the box body is sequentially provided with a high-temperature drying cavity, a cold air cavity and a low-temperature drying cavity in the conveying direction of the steel belt. The temperature of the high-temperature drying cavity is higher than that of the low-temperature drying cavity, the low-temperature drying cavity is communicated with the cold air cavity through a pipeline, the pipeline is located outside the box body, and an air outlet is formed in the position, on the cold air cavity, of the box body. Air supply devices are fixedly arranged in the high-temperature drying cavity and the low-temperature drying cavity, each air supply device comprises an air supply barrel and a hot air device which are fixedly arranged on the box body and communicate with each other, each air supply barrel comprises an air storage cavity and an air spraying cavity, and the sectional area of the air spraying cavity is smaller than that of the air storage cavity. The device efficiently dries residual solvent, saves energy and is suitable for drying steel belts.

Description

Technical Field

[0001] This utility model belongs to the field of steel strip galvanizing technology, and relates to a drying device, specifically a galvanized steel strip drying device. Background Technology

[0002] Before hot-dip galvanizing, steel strips need to undergo degreasing, pickling, hot water washing, ammonium chloride immersion, and drying. Among these steps, drying is crucial. If the solvent on the steel strip is not dried, the moisture in it will vaporize upon contact with the molten zinc, reducing its effectiveness and leading to incomplete galvanizing. This results in small black spots appearing on the galvanized steel strip. Additionally, smoke from the drying oven or the presence of oily ash particles in the airflow can also cause small black spots on the galvanized steel strip. Therefore, ensuring proper drying is essential for the quality of galvanizing.

[0003] The existing drying device is a drying oven. After the steel strip passes through the drying oven, the solvent remaining on the surface is evaporated. However, the disadvantages of this structure are: (1) The temperature inside the drying oven is difficult to control. If the temperature is set too high, the ammonium chloride solvent on the surface of the steel strip will be burned off and lose its activity, resulting in incomplete zinc plating and small black spots, which affects the quality of zinc plating. If the temperature is set too low, the solvent on the steel strip cannot be dried. During zinc plating, the solvent vaporizes and small black spots appear after zinc plating, which affects the quality of zinc plating. (2) A certain heat preservation time is required during the drying process, which reduces the drying efficiency and wastes energy. Utility Model Content

[0004] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a galvanized steel strip drying device that achieves high efficiency and energy saving when drying the solvent remaining on the steel strip after cleaning.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A galvanized steel strip drying device includes a housing and a roller assembly rotatably disposed inside the housing for conveying the steel strip. The housing is provided with a high-temperature drying chamber, a cold air chamber and a low-temperature drying chamber in sequence along the conveying direction of the steel strip. The temperature of the high-temperature drying chamber is higher than that of the low-temperature drying chamber. The low-temperature drying chamber is connected to the cold air chamber through a pipeline located outside the housing. An air outlet is provided at the location of the cold air chamber on the housing.

[0007] Both the high-temperature drying chamber and the low-temperature drying chamber are equipped with air supply devices. Each air supply device includes an air supply duct and a hot air device that are fixed on the box body and connected to each other. The air supply duct includes an air storage chamber and an air spray chamber. The cross-sectional area of ​​the air spray chamber is smaller than that of the air storage chamber.

[0008] As a limitation of this utility model, two air supply ducts are provided in both the high-temperature drying chamber and the low-temperature drying chamber. Each air supply duct is fixedly connected to the hot air device. The two air supply ducts are arranged opposite each other and are located on both sides of the steel strip thickness direction.

[0009] As a further limitation of this utility model, the width of the air spray cavity is adapted to the width of the steel strip, and the air outlet port on the air spray cavity is an inclined surface parallel to the steel strip.

[0010] As another limitation of this utility model, two brushes are fixed at the inlet of the steel strip on the outer wall of the box body. The two brushes are arranged opposite each other and are located on both sides of the thickness direction of the steel strip.

[0011] As a limitation of this utility model, the idler roller assembly includes a first idler roller rotatably disposed in a high-temperature drying chamber, a second idler roller rotatably disposed in a cold air chamber, and a third idler roller rotatably disposed in a low-temperature drying chamber. The height of the second idler roller is greater than that of the first and second idler rollers, and the air outlet of the pipeline is located directly above the second idler roller.

[0012] As a third limitation of this utility model, the hot air device is a hot air blower, and a dustproof net is fixedly provided on the air duct at the position where the hot air blower is connected.

[0013] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0014] (1) When the steel belt passes through the high-temperature airflow, the solvent can quickly leave the liquid state and accelerate evaporation. The cross-sectional area of ​​the air blower is small. When the airflow passes through this position, the flow rate increases. The high-speed airflow can quickly carry away the surrounding water vapor. The combination of high temperature and high-speed airflow can accelerate the evaporation of the liquid. Although the high-temperature drying chamber is dried at high temperature, the humidity in this area is relatively high. The cold air chamber is dry. When the steel belt passes through, the dry airflow carries away the moisture. Finally, it is dried again at low temperature to consolidate and enhance the drying effect. High temperature accelerates solvent evaporation, and cold air helps to condense the undried solvent. The low temperature drying greatly improves the drying efficiency. At the same time, the temperature set in the high-temperature zone does not need to be too high. The low temperature of the cold air in the back enhances the drying effect, greatly saving electricity and reducing production costs.

[0015] (2) This utility model dries both sides of the steel belt at the same time, further improving the drying efficiency, and the relatively set air duct can improve the stability of the steel belt conveying.

[0016] (3) The air spray chamber of this utility model is adapted to the width of the steel belt, and the air outlet is set parallel to the steel belt, which can improve the uniformity of drying.

[0017] (4) The brush of this utility model can smooth out the solvent on the steel belt in advance and remove more solvent, thereby improving the drying efficiency.

[0018] (5) This utility model uses the low-temperature airflow generated in the low-temperature drying zone as the air source of the cold air cavity, which can save the cost of use.

[0019] In summary, this invention efficiently dries residual solvents, saves energy, and is suitable for drying steel belts. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a perspective structural diagram of the present invention.

[0022] In the diagram: 1. Chamber; 2. High-temperature drying chamber; 3. Cold air chamber; 4. Low-temperature drying chamber; 5. Baffle; 6. First idler roller; 7. Second idler roller; 8. Third idler roller; 9. Air supply duct; 91. Air storage chamber; 92. Air spray chamber; 10. Hot air blower; 11. Dustproof net; 12. Pipeline; 13. Air outlet; 14. Brush; 15. Steel belt. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0024] Example 1: Galvanized Steel Strip Drying Device

[0025] like Figure 1 As shown, it includes a housing 1 and an idler roller assembly. The idler roller assembly is rotatably disposed inside the housing 1 and is used to lift and convey the steel strip 15. After the steel strip 15 has been cleaned in the previous process, solvent will remain on its surface. If the solvent cannot be completely dried, it will vaporize during the hot-dip galvanizing stage, causing small black spots to appear on the steel strip 15, which will affect the quality of galvanizing.

[0026] The left end of box 1 ( Figure 1 The left end) is equipped with a steel belt inlet 15, and the right end of the box 1 ( Figure 1 The right end of the container is provided with a steel belt 15 outlet. The interior of the container 1 is divided into three chambers by a baffle 5, which are, in sequence, a high-temperature drying chamber 2, a cold air chamber 3, and a low-temperature drying chamber 4 along the conveying direction of the steel belt 15. The baffle 5 between the high-temperature drying chamber 2 and the cold air chamber 3 is provided with an opening for the steel belt 15 to pass through, and the baffle 5 between the cold air chamber 3 and the low-temperature drying chamber 4 is provided with an opening for the steel belt 15 to pass through.

[0027] The idler assembly includes a first idler 6, a second idler 7, and a third idler 8. The first idler 6 is rotatably mounted on the inner wall of the chamber 1 inside the high-temperature drying chamber 2. The second idler 7 is rotatably mounted on the inner wall of the chamber 1 inside the cold air chamber 3. The third idler 8 is rotatably mounted on the inner wall of the chamber 1 inside the low-temperature drying chamber 4. The first idler 6 and the second idler 7 are located at the same horizontal height inside the chamber 1. The height of the second idler 7 is greater than that of the first idler 6 and the second idler 7, so that the steel belt 15 is conveyed in an isosceles triangle inside the chamber 1.

[0028] Both the high-temperature drying chamber 2 and the low-temperature drying chamber 4 are equipped with air supply devices, and the installation positions and methods of the air supply devices are the same. The installation method of the air supply device in the high-temperature drying chamber 2 will be described as an example. The air supply device includes an air supply duct 9 and a hot air device. The air supply duct 9 is fixed to the inner wall of the chamber 1, and the hot air device is a hot air blower 10, which is fixed to the outer wall of the chamber 1. The hot air blower 10 is connected to the air supply duct 9. A dustproof net 11 is fixed to the position on the air supply duct 9 where it connects to the hot air blower 10 to prevent impurities in the air from falling onto the steel belt 15.

[0029] The width of the air supply duct 9 is the same as the width of the steel belt 15. The air supply duct 9 includes an air storage chamber 91 and an air spray chamber 92. In the thickness direction of the air supply duct 9, the cross-sectional area of ​​the air spray chamber 92 is smaller than that of the air storage chamber 91. The air storage chamber 91 of the air supply duct 9 is connected to the hot air blower 10. The air spray chamber 92 extends to the steel belt 15. The hot air from the hot air blower 10 first enters the air storage chamber 91 of the air supply duct 9, and then enters the air spray chamber 92. Because the cross-section of the air spray chamber 92 is smaller, the hot air is accelerated and ejected at this position. The high-temperature, high-speed airflow carries away the solvent on the surface of the steel belt 15. The outlet of the air spray chamber 92 is an inclined surface parallel to the steel belt 15. The inclined surface structure can improve the uniformity of drying. Two air supply devices are installed inside the high-temperature drying chamber 2. The air supply ducts 9 of the two air supply devices are arranged vertically opposite each other and located on both sides of the thickness direction of the steel belt 15. This can dry both sides of the steel belt 15 at the same time, reduce the shaking of the steel belt 15, and improve the stability of the steel belt 15 conveying.

[0030] The temperature of the high-temperature drying chamber 2 inside the housing 1 is higher than that of the low-temperature drying chamber 4. The temperature inside the high-temperature drying chamber 2 is 100-120℃. The hot air blower 10 inside the high-temperature drying chamber 2 is an HWIR300GZ high-pressure industrial hot air blower, which has a digital display temperature adjustment, solid-state relay control of power output, a maximum temperature rise of 160℃, and adjustable outlet air temperature. The temperature inside the low-temperature drying chamber 4 is 50-60℃. The hot air blower 10 inside the low-temperature drying chamber 4 is an industrial dryer with intelligent temperature control, dual meters and dual controls, a 1kW power output, and an adjustable outlet air temperature of 58℃. The low-temperature drying chamber 4 is connected to the cold air chamber 3 through pipe 12, which is located outside the housing 1. The air outlet 13 of pipe 12 is located directly above the second roller 7. The cold air sprayed from pipe 12 circulates to both sides through the second roller 7. The cold air chamber 3 on the housing 1 has an air outlet 13 located near the ground. An air outlet 13 is provided at the position of the high-temperature drying chamber 2 in the box 1 to discharge the high-temperature and humid gas into the air.

[0031] Two brushes 14 are fixed on the outer wall of the housing 1. The two brushes 14 are located at the inlet of the steel strip 15 and are arranged opposite each other, respectively on both sides of the thickness direction of the steel strip 15. The brushes 14 remove most of the solvent residue on the steel strip 15 and then dry it, thereby improving the drying efficiency.

[0032] In this embodiment, after cleaning, the steel strip 15 enters the housing 1 of this application. The hot air blower 10 connected to the high-temperature drying chamber 2 is set to an outlet temperature of 100°C, and the hot air blower 10 connected to the low-temperature drying chamber 4 is set to an outlet temperature of 60°C. The steel strip 15 is dried at high temperature in the high-temperature drying zone, cooled in the cold air chamber 3, and then dried again in the low-temperature drying chamber 4 before entering the hot-dip galvanizing process.

[0033] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A galvanized steel strip drying device, characterized in that: The device includes a housing and a roller assembly that is rotatably installed inside the housing for conveying steel strips. The housing is provided with a high-temperature drying chamber, a cold air chamber and a low-temperature drying chamber in sequence along the conveying direction of the steel strip. The temperature of the high-temperature drying chamber is higher than that of the low-temperature drying chamber. The low-temperature drying chamber is connected to the cold air chamber through a pipeline located outside the housing. An air outlet is provided at the location of the cold air chamber on the housing. Both the high-temperature drying chamber and the low-temperature drying chamber are equipped with air supply devices. Each air supply device includes an air supply duct and a hot air device that are fixed on the box body and connected to each other. The air supply duct includes an air storage chamber and an air spray chamber. The cross-sectional area of ​​the air spray chamber is smaller than that of the air storage chamber.

2. The galvanized steel strip drying device according to claim 1, characterized in that: Two air supply ducts are installed in both the high-temperature drying chamber and the low-temperature drying chamber. Each air supply duct is fixedly connected to the hot air device. The two air supply ducts are arranged opposite each other and are located on both sides of the steel strip thickness direction.

3. The galvanized steel strip drying device according to claim 2, characterized in that: The width of the air spray chamber is adapted to the width of the steel strip, and the air outlet of the air spray chamber is an inclined surface parallel to the steel strip.

4. The galvanized steel strip drying device according to any one of claims 1-3, characterized in that: Two brushes are fixed at the inlet of the steel strip on the outer wall of the box. The two brushes are arranged opposite each other and are located on both sides of the thickness direction of the steel strip.

5. The galvanized steel strip drying device according to claim 4, characterized in that: The roller assembly includes a first roller rotatably disposed in a high-temperature drying chamber, a second roller rotatably disposed in a cold air chamber, and a third roller rotatably disposed in a low-temperature drying chamber. The height of the second roller is greater than that of the first and second rollers, and the air outlet of the pipeline is located directly above the second roller.

6. The galvanized steel strip drying device according to any one of claims 1-3 and 5, characterized in that: The hot air device is a hot air blower, and a dustproof net is fixed on the air duct at the position where the hot air blower is connected.

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