A near infrared curing system for curing of strip steel surface coatings

Abstract

This utility model discloses a near-infrared curing system for curing coatings on steel strip surfaces. It includes: two near-infrared curing units, respectively disposed on the upper and lower surfaces of the steel strip, each with a connector for connecting to a power supply line; two cooling mechanisms for cooling the connectors of the near-infrared curing units, each including: a cooler; a temperature-controlled air duct, the air inlet of which is connected to the cooler, the connectors being disposed within the duct, and several temperature sensors disposed within the duct; a return air duct, one end of which is connected to the air outlet of the temperature-controlled air duct, and the other end connected to the cooler; and a temperature controller, which is communicatively connected to the temperature sensors and the cooler. This utility model adds a temperature-controlled air duct and installs the connectors within it. By controlling the temperature of the temperature-controlled air duct through the cooler, it solves the problem of damage caused by connector bursting, thereby stabilizing the near-infrared curing process for fingerprint-resistant liquids and reducing equipment maintenance costs.

Description

Technical Field

[0001] This utility model relates to the field of cold-rolled strip galvanizing technology, and in particular to a near-infrared curing system for curing coatings on strip surfaces. Background Technology

[0002] The galvanizing process for cold-rolled strip steel uses cold-rolled strip steel sheets and coils as raw materials. The process involves uncoiling, welding, inlet loop storage of the strip steel, strip cleaning, heating and annealing, galvanizing, cooling, smoothing and leveling, near-infrared curing with fingerprint-resistant liquid coating, outlet loop storage of the strip steel, slitting, coiling, and weighing of the finished steel coils to form the final product. For example... Figure 1 The diagram shown is a layout diagram of the galvanizing process for cold-rolled strip steel.

[0003] The fingerprint-resistant liquid coating near-infrared curing process involves using a roller coater to apply fingerprint-resistant liquid to the upper and lower surfaces of galvanized steel strip. Under specified time and heating power, the fingerprint-resistant liquid is rapidly cured in a near-infrared curing unit, forming a stable and flexible cured layer that firmly adheres to the upper and lower surfaces of the galvanized steel strip. This ensures the quality of the finished steel coil and prevents the fingerprint-resistant liquid from adhering to other process equipment during subsequent processes, thus avoiding equipment damage and product quality issues. Figure 2 The image shown is a side view of the near-infrared curing process for fingerprint-resistant liquid coating.

[0004] The near-infrared curing unit consists of upper and lower surface near-infrared curing units made of galvanized steel strip, arranged independently and symmetrically. Each curing unit comprises cylindrical hollow glass near-infrared lamps arranged at fixed intervals. Wiring terminals are used for power supply connections, and cable trays are used for laying the power supply lines. Each lamp is 1.2 meters long and consists of a wiring terminal, a cylindrical hollow glass unit, and a filament. The cylindrical hollow glass unit is a vacuum chamber containing the filament. Figure 3 The image shows a front view of the internal layout of the near-infrared curing unit.

[0005] During the near-infrared curing process of galvanized steel strip coated with fingerprint-resistant liquid, the peak internal temperature of the near-infrared curing unit reaches approximately 1000℃. When operating continuously for more than one and a half months, the prolonged high-temperature environment often causes the lamp connectors to burst, resulting in damage to the near-infrared curing unit. This severely affects the curing effect of the fingerprint-resistant liquid on the galvanized steel strip and the quality of the finished product, while also leading to high equipment maintenance costs.

[0006] In view of this, the existing technology should be improved in order to solve the aforementioned technical problems. Utility Model Content

[0007] The main purpose of this invention is to provide a near-infrared curing system for curing coatings on steel strip surfaces. It adds a temperature-controlled air duct and installs the lamp tube connector inside the temperature-controlled air duct. The temperature controller controls the cooler to control the temperature of the temperature-controlled air duct, solving the problem of near-infrared curing unit damage caused by connector bursting inside the near-infrared curing unit. This stabilizes the near-infrared curing process for fingerprint-resistant liquids and reduces equipment operation and maintenance costs.

[0008] According to one aspect of the present invention, a near-infrared curing system for curing coatings on the surface of steel strip is provided, comprising: two near-infrared curing units, which are respectively disposed on the upper surface side and the lower surface side of the steel strip, and have terminals for connecting power supply lines.

[0009] Two cooling mechanisms, each designed to cool the connectors of each near-infrared curing unit, and comprising:

[0010] Cooler; temperature-controlled air duct, the air inlet of the temperature-controlled air duct is connected to the cooler, the wiring terminal is set inside the temperature-controlled air duct, and several temperature sensors are set inside the temperature-controlled air duct.

[0011] The reheating air duct connects at one end to the air outlet of the temperature-controlled air duct and at the other end to the cooler; and

[0012] The thermostat communicates with the temperature sensor and the cooler.

[0013] According to one embodiment of the present invention, each near-infrared curing unit includes multiple near-infrared lamps arranged in parallel with each other, and has two rows of terminals respectively disposed at both ends of the multiple near-infrared lamps; each cooling mechanism includes two temperature-controlled air ducts, the two rows of terminals are respectively disposed in the two temperature-controlled air ducts, and the reheat air duct is disposed between the two temperature-controlled air ducts.

[0014] According to one embodiment of the present invention, the temperature control duct and the return duct are closed pipes with a high-temperature resistant insulating layer coated on the inner wall.

[0015] According to one embodiment of the present invention, the cooler is an air-cooled cooler or a water-cooled cooler.

[0016] According to one embodiment of the present invention, a guide plate is provided in the temperature control air duct and / or the reheat air duct.

[0017] According to one embodiment of the present invention, the tilt angle of the guide plate is 30~60°.

[0018] According to one embodiment of the present invention, a detachable maintenance cover is provided on the outer wall of the temperature control duct and / or the reheat duct, and the maintenance cover is fixed to the duct body by high-temperature resistant bolts.

[0019] According to one embodiment of the present invention, the temperature sensor is a thermocouple or an infrared temperature probe.

[0020] According to one embodiment of the present invention, the cooling structure further includes an alarm module, which is communicatively connected to the temperature controller.

[0021] According to one embodiment of the present invention, the alarm module includes a light alarm and / or a sound alarm and / or a display screen.

[0022] Compared with existing technologies, this utility model adds a temperature-controlled air duct and installs the lamp tube connector inside the temperature-controlled air duct. The temperature controller controls the cooler to control the temperature of the temperature-controlled air duct, solving the problem of near-infrared curing unit damage caused by connector bursting inside the near-infrared curing unit. This stabilizes the near-infrared curing process of fingerprint-resistant liquid, reduces equipment operation and maintenance costs, and has significant improvements in safety, operability, maintainability, and adaptability. It has good application value and is suitable for market promotion and use. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some implementation examples of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart of the galvanizing process for cold-rolled strip steel in the prior art is shown;

[0025] Figure 2 A side view of a prior art near-infrared curing process for fingerprint-resistant liquid coating is shown;

[0026] Figure 3 A front view of the internal arrangement of a near-infrared curing device in the prior art is shown;

[0027] Figure 4 A schematic diagram of a near-infrared curing system for curing coatings on steel strip surfaces is shown, according to an exemplary embodiment of the present invention.

[0028] In the diagram:

[0029] 1. Near-infrared lamp tube; 2. Cable tray; 3. Wiring connector; 4. Temperature-controlled air duct; 5. Cooler; 6. Reheating air duct; 7. Thermostat; 8. Temperature sensor. Detailed Implementation

[0030] The following detailed description of the embodiments is used to exemplify the principles of the present invention, but should not be used to limit the scope of the present invention. The present invention can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0031] These embodiments are provided to make this disclosure thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0032] It should be noted that, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, 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. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0033] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0034] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0036] like Figure 4As shown, this utility model provides a near-infrared curing system for curing coatings on steel strip surfaces, comprising: two near-infrared curing units, respectively disposed on the upper and lower surfaces of the steel strip, and having terminals 3 for connecting to power supply lines; two cooling mechanisms, each cooling mechanism for cooling the terminals of each near-infrared curing unit and comprising: a cooler 5; a temperature-controlled air duct 4, the air inlet of which is connected to the cooler 5, the terminals 3 being disposed within the temperature-controlled air duct 4, and a plurality of temperature sensors 8 disposed within the temperature-controlled air duct 4; a return air duct 6, one end of which is connected to the air outlet of the temperature-controlled air duct 4, and the other end of which is connected to the cooler 5; and a temperature controller 7, which is communicatively connected to the temperature sensors 8 and the cooler 5.

[0037] In the near-infrared curing system according to an embodiment of this utility model, a temperature-controlled air duct 4 is added, and the lamp tube connector 3 is installed inside the temperature-controlled air duct 4. A temperature controller 7, based on temperature sensor readings, controls the cooler 5 to control the temperature of the temperature-controlled air duct 4, thus solving the problem of near-infrared curing unit damage caused by connector 3 bursting inside the near-infrared curing unit. This stabilizes the near-infrared curing process for fingerprint-resistant liquid, reduces equipment maintenance costs, and significantly improves safety, operability, maintainability, and adaptability. It has good application value and is suitable for market promotion and use. The near-infrared curing system of this application can be used to cure fingerprint-resistant liquid on the surface of steel strip, and can also be used to cure other coatings on the surface of steel strip.

[0038] Specifically, the near-infrared curing unit consists of cylindrical hollow glass near-infrared lamp tubes 1 arranged at fixed intervals, with connectors 3 for power supply connection and cable trays 2 for laying power supply lines. Each lamp tube is 1.2 meters long and consists of connectors 3, cylindrical hollow glass, and a filament. The cylindrical hollow glass is a vacuum chamber containing a filament.

[0039] In some specific embodiments, each near-infrared curing unit includes multiple near-infrared lamps 1 arranged parallel to each other, and has two rows of terminals 3 respectively disposed at both ends of the multiple near-infrared lamps 1; each cooling mechanism includes two temperature-controlled air ducts 4, with the two rows of terminals 3 respectively disposed within the two temperature-controlled air ducts 4, and a return air duct 6 disposed between the two temperature-controlled air ducts 4. The parallel arrangement and fixed spacing (e.g., 10~15 cm) of the multiple near-infrared lamps 1 can optimize the radiant heat field distribution, avoid strip deformation or local overheating due to heat, and at the same time improve energy utilization and reduce energy consumption.

[0040] The dual temperature-controlled air duct 4 can achieve differentiated and precise temperature control, and adapt to the heat dissipation needs of different connectors 3 through independent airflow adjustment to avoid heat cross-interference; the heat recovery air duct 6 uses the temperature gradient between the two air ducts to recover waste heat, and reduces overall energy consumption through airflow circulation, while balancing the temperature difference in the area and reducing the impact of thermal stress on the equipment.

[0041] In some specific embodiments, the temperature-controlled air duct 4 and the return air duct 6 are closed pipes with their inner walls coated with a high-temperature resistant insulating layer. The closed structure effectively isolates external environmental interference, reduces heat loss, and maintains the temperature stability of the cooling medium, significantly improving cooling efficiency. The high-temperature resistant insulating layer can withstand long-term high temperatures (peak values ​​up to 1000℃), preventing equipment aging caused by pipe deformation or heat conduction, and extending service life. At the same time, the insulating layer also has a heat-reflecting function, enhancing the cooling medium's ability to absorb and dissipate heat from the lamp connector 3, reducing the risk of bursting.

[0042] Based on the above embodiments, cooler 5 can be either an air-cooled cooler or a water-cooled cooler. Air-cooled coolers do not rely on an external water source, rapidly dissipating heat through air circulation, making them suitable for space-constrained or water-scarce scenarios. They also feature a simple structure and low maintenance costs. Water-cooled coolers utilize the high specific heat capacity of water to achieve efficient and continuous cooling under high-temperature and high-load conditions, ensuring stable operation of the cooling system. The two modes can work independently or in combination, dynamically switching according to the actual needs of the production line, optimizing energy utilization and reducing operating costs.

[0043] In some specific embodiments, a guide vane is provided inside the temperature control duct 4 and / or the return air duct 6. Specifically, the inclination angle of the guide vane is 30~60°.

[0044] The deflector plate guides the airflow evenly at an angle of 30~60°, avoiding local turbulence or dead zones, ensuring that the cooling medium fully covers high-temperature areas such as lamp connector 3, eliminating the risk of bursting caused by temperature differences; at the same time, it reduces airflow resistance in the duct, reduces fan energy consumption, and extends equipment life.

[0045] In some specific embodiments, a removable maintenance cover is provided on the outer wall of the temperature control duct 4 and / or the return air duct 6. The maintenance cover is fixed to the duct body by high-temperature resistant bolts. The removable design greatly simplifies the maintenance process, allowing for quick inspection or replacement of internal components without disassembling the entire duct, significantly reducing downtime and improving production line continuity.

[0046] Based on the above embodiments, the temperature sensor 8 is a thermocouple or an infrared temperature probe. Thermocouples are resistant to high temperatures, have a fast response, and a simple structure. They can work stably in the long-term high-temperature environment of the near-infrared curing unit and output reliable temperature signals in real time. Infrared temperature probes avoid physical contact with the lamp tube connector 3 or the inner wall of the air duct through non-contact measurement, making them particularly suitable for narrow or high-risk areas and expanding the monitoring coverage.

[0047] Based on the above embodiments, the cooling structure also includes an alarm module, which is communicatively connected to the temperature controller 7.

[0048] Based on the above embodiments, the alarm module includes a light alarm and / or a sound alarm and / or a display screen.

[0049] Real-time temperature monitoring provides immediate alerts for abnormalities (such as overheating or cooling failure) via audible and visual signals or remote notifications, preventing lamp bursts or process interruptions due to overheating. The alarm module automatically records fault time, temperature peaks, and other data, providing a basis for fault tracking and preventative maintenance, optimizing operation and maintenance strategies, and extending equipment life. At the same time, it reduces the frequency of manual inspections, lowers operational safety risks and labor costs, ensures continuous and efficient operation of the cold-rolled galvanizing production line, and significantly improves the stability and economy of the fingerprint-resistant liquid curing process.

[0050] A specific application of this utility model is as follows: before use, the equipment is checked and the temperature threshold (e.g., 40~60℃) is set through the temperature controller 7. The cooler 5 is started and the near-infrared curing unit is running. The temperature sensor 8 continuously monitors the temperature in real time. If the temperature exceeds the preset threshold, the temperature controller 7 automatically adjusts the power of the cooler 5 (e.g., increases the air volume or refrigerant flow rate) until the temperature returns to within the threshold.

[0051] This invention has the following advantages: In the near-infrared curing process of fingerprint-resistant liquid for cold-rolled galvanizing, by adding a temperature-controlled air duct 4 and integrating the lamp connector 3 inside it, combined with the linkage between the temperature controller 7 and the cooler 5, precise temperature control of high-temperature areas (such as connector 3) is achieved. This application stably controls the working temperature of connector 3 within a reasonable range, completely solving the problems of connector 3 cracking and curing device damage caused by long-term high temperature (peak temperature up to 1000℃) in traditional processes. It improves the uniformity of the fingerprint-resistant liquid curing layer, significantly enhances process stability, significantly reduces equipment failure rate, saves annual maintenance costs, and reduces production capacity loss caused by downtime. The overall economic benefits are significant, especially suitable for high-load continuous cold-rolled galvanizing production lines, and has high market promotion value.

[0052] Those skilled in the art should understand that, in the description of this utility model, it should be noted that, 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.

[0053] The discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the framework of the present invention, technical features of the above embodiments or different embodiments can also be combined, and many other variations of different aspects of the present invention exist, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A near-infrared curing system for curing coatings on steel strip surfaces, characterized in that, include: Two near-infrared curing units are respectively disposed on the upper and lower surfaces of the strip and have terminals for connecting power supply lines. Two cooling mechanisms, each of which is used to cool the connector of each near-infrared curing unit and includes: Cooler; A temperature-controlled air duct, the air inlet of which is connected to the cooler, the wiring terminal is located inside the temperature-controlled air duct, and several temperature sensors are installed inside the temperature-controlled air duct. A reheating air duct, one end of which is connected to the air outlet of the temperature-controlled air duct, and the other end of which is connected to the cooler; and A thermostat, which is communicatively connected to the temperature sensor and the cooler.

2. The near-infrared curing system according to claim 1, characterized in that, Each near-infrared curing unit includes multiple near-infrared lamps arranged parallel to each other, and has two rows of terminals respectively disposed at both ends of the multiple near-infrared lamps; each cooling mechanism includes two temperature-controlled air ducts, the two rows of terminals are respectively disposed in the two temperature-controlled air ducts, and the reheat air duct is disposed between the two temperature-controlled air ducts.

3. The near-infrared curing system according to claim 1, characterized in that, The temperature-controlled air duct and the return air duct are closed pipes with a high-temperature resistant insulating layer coated on the inner wall.

4. The near-infrared curing system according to claim 1, characterized in that, The cooler is either an air-cooled cooler or a water-cooled cooler.

5. The near-infrared curing system according to claim 1, characterized in that, The temperature-controlled air duct and / or the reheat air duct are equipped with a baffle plate.

6. The near-infrared curing system according to claim 5, characterized in that, The tilt angle of the guide plate is 30~60°.

7. The near-infrared curing system according to claim 1, characterized in that, A detachable maintenance cover is provided on the outer wall of the temperature control duct and / or the reheat duct, and the maintenance cover is fixed to the duct body by high-temperature resistant bolts.

8. The near-infrared curing system according to claim 1, characterized in that, The temperature sensor is a thermocouple or an infrared temperature probe.

9. The near-infrared curing system according to claim 1, characterized in that, The cooling structure also includes an alarm module, which is communicatively connected to the temperature controller.

10. The near-infrared curing system according to claim 9, characterized in that, The alarm module includes a light alarm and / or a sound alarm and / or a display screen.

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