Aluminum profile extrusion cooling device

Abstract

This invention belongs to the field of aluminum profile production technology, specifically providing an aluminum profile extrusion cooling device including an air-cooling section, comprising a first necking channel and a first conveyor line; the first necking channel includes an air inlet, a neck, and an air collecting section connected in sequence; the inner diameter of the neck is smaller than the inner diameter of the air inlet and the air collecting section; an air extraction component is provided on the outer side of the air collecting section; the first conveyor line passes through the first necking channel; a water-cooling section is located at the end of the air-cooling section away from the extruder; it includes a second conveyor line and multiple annular water spray components; a drying section is located at the end of the water-cooling section away from the air-cooling section; it includes a blower mechanism; the water-cooling section is equipped with a waste heat recovery mechanism. This invention uses the first necking channel to form a relatively uniform, high-speed circumferential airflow, making the aluminum profile cooling more uniform and the overall heat exchange efficiency higher; simultaneously, the waste heat recovery mechanism recovers the waste heat during the cooling process to heat the drying hot air, which can effectively remove residual moisture from the surface of the profile after water cooling.

Description

Technical Field

[0001] This application belongs to the field of aluminum profile production technology, and more specifically, relates to an aluminum profile extrusion cooling device. Background Technology

[0002] After hot extrusion forming, aluminum profiles are at a high temperature (usually 400℃~550℃), and need to be cooled down quickly by a cooling device to control their microstructure and properties, so as to facilitate subsequent processing such as straightening, sawing, and aging.

[0003] Currently, the main cooling methods for extruded aluminum profiles include air cooling, water cooling, and a combination of both. Air cooling typically uses a simple airflow structure (such as an axial fan) to directly blow air onto the aluminum profile surface. However, due to uneven airflow distribution, the cooling effect is inconsistent throughout the circumference of the aluminum profile, resulting in locally excessively high temperatures and poor overall cooling efficiency. In water cooling, the spray nozzles are generally only positioned above or below the aluminum profile, making it difficult to achieve uniform circumferential cooling. This leads to large temperature differences between the top and bottom of the profile, making it prone to bending and deformation, and also results in low overall cooling efficiency. The combination of air cooling and water cooling often follows a sequence of water cooling followed by air cooling: high-temperature profiles are directly cooled in the water cooling section for rapid cooling, and then dried by air cooling. However, direct contact between high-temperature profiles and cooling water results in large temperature differences and strong thermal shock, which can easily generate significant internal stress, leading to profile deformation and warping, affecting dimensional accuracy and yield. After water cooling, a large number of water droplets and water films adhere to the surface of the profiles. Due to limited air velocity and lower temperature, subsequent air cooling cannot effectively and thoroughly remove the residual moisture from the profile surface. When the profiles with water enter subsequent heating processes (such as aging furnaces), the rapid vaporization of moisture can easily cause uneven local temperature distribution, resulting in surface defects and affecting product quality. Summary of the Invention

[0004] Based on the above-mentioned technical problems, this application provides an aluminum profile extrusion cooling device to solve the technical problems existing in the prior art, such as uneven cooling between air cooling and water cooling, large thermal shock caused by water cooling followed by air cooling, profile deformation, and incomplete removal of residual moisture, which in turn affects product quality.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: An aluminum profile extrusion cooling device is provided, comprising: an air-cooling section disposed on one side of the extruder output end; including a first necking channel and a first conveyor line; the first necking channel includes an air inlet, a necking section, and an air collecting section connected in sequence; the inner diameter of the necking section is smaller than the inner diameters of the air inlet and the air collecting section, thereby increasing the airflow velocity when the airflow passes through the necking section and forming a circumferentially uniform surrounding airflow to uniformly cool the aluminum profile; an air extraction component is provided on the outer side of the air collecting section; the first conveyor line passes through the... The first constriction channel is used to convey aluminum profiles; the water-cooling section is located at the end of the air-cooling section away from the extruder; it includes a second conveyor line and multiple annular water spray assemblies; the second conveyor line is used to convey aluminum profiles; the multiple annular water spray assemblies are arranged at intervals along the conveying direction of the aluminum profiles and are respectively surrounding the outside of the aluminum profiles for spraying water onto the surface of the aluminum profiles from a circumferential perspective; the drying section is located at the end of the water-cooling section away from the air-cooling section; it includes a blower mechanism for blowing hot air onto the surface of the aluminum profiles; the water-cooling section is equipped with a waste heat recovery mechanism for heating the hot air in the drying section.

[0006] Furthermore, the air extraction assembly includes an air collection hood, which covers the outside of the air collection section; the air collection hood has a clearance opening in the middle for the first conveyor line and aluminum profile to pass through; the side wall of the air collection hood is connected to a plurality of air outlet pipes, which are evenly arranged around the circumference of the air collection hood; an air collecting box is connected to the side of the plurality of air outlet pipes away from the air collection hood, and one end of the air collecting box has an air outlet for connecting to the suction fan.

[0007] Furthermore, the air collecting box is annular, and an air equalization plate is provided inside the air collecting box. The air equalization plate has multiple air equalization holes. The air equalization plate divides the interior of the air collecting box into an air collecting chamber and a pressure stabilizing chamber. Multiple air outlet pipes are connected to the air collecting chamber, and the suction fan is connected to the pressure stabilizing chamber through a pipe.

[0008] Furthermore, the water-cooling section also includes a water tank and a cover; the second conveying line includes multiple rollers, which are arranged at intervals along the conveying direction of the aluminum profile and are rotatably mounted on the top of the water tank; multiple annular water spray assemblies are respectively fixedly connected to the water tank via connecting rods; the cover is installed on the top of the water tank.

[0009] Furthermore, the output end of the water-cooling section is provided with an annular air knife, which surrounds the outside of the aluminum profile and is used to blow away residual water droplets on the surface of the aluminum profile.

[0010] Furthermore, the water tank is equipped with a horizontal partition, which divides the internal space of the water tank into a lower cold water space and an upper water receiving space; multiple annular water spray components are connected to the cold water space through pipelines and a booster pump.

[0011] Furthermore, the waste heat recovery mechanism includes a primary heat exchange component, a secondary heat exchange component, and a tertiary heat exchange component connected in sequence; the primary heat exchange component is fixed in the water receiving space and is used to exchange heat between the external air and the hot water in the water receiving space; the secondary heat exchange component is fixed on the inner wall of the top of the hood and is used to exchange heat between the air after the primary heat exchange and the steam inside the hood; the tertiary heat exchange component is located at the top of the hood and is used to exchange heat between the air after the secondary heat exchange and the hot air extracted by the exhaust component; the air after heat exchange is transported to the drying section through a blower and pipelines.

[0012] Furthermore, the primary heat exchange assembly includes a heat exchange plate, the outer wall of which is provided with heat exchange fins, and the interior of which is provided with heat exchange channels; the heat exchange channels are provided with multiple baffles, which are arranged in an alternating manner to allow air to flow along an S-shaped path within the heat exchange channels.

[0013] Furthermore, a heat exchange box is provided at the top of the cover, and the three-stage heat exchange assembly is fixed inside the heat exchange box; the output end of the exhaust assembly is connected to the heat exchange box, and an exhaust port is provided at the top of the heat exchange box; the output end of the three-stage heat exchange assembly is connected to the blower assembly of the drying section.

[0014] Furthermore, the drying section also includes a second constriction channel and a third conveyor line; the third conveyor line passes through the second constriction channel and is used to convey aluminum profiles; the second constriction channel has the same structure as the first constriction channel and is arranged in a mirror image of the first constriction channel; the blower mechanism is fixed at one end of the second constriction channel away from the water-cooling section; the blower mechanism includes an air distribution ring box, and a plurality of air supply pipes are provided on one side of the air distribution ring box. The plurality of air supply pipes are evenly arranged along the circumference of the air distribution ring box, and the output ends of the plurality of air supply pipes extend along the aluminum profile conveying direction toward a direction close to the central axis of the second constriction channel.

[0015] Compared with the prior art, the beneficial effects of the aluminum profile extrusion cooling device provided in this application are: 1. By adopting a method of first air cooling and then water cooling, the thermal shock caused by direct contact between high-temperature profiles and cooling water is avoided, which can effectively reduce internal stress and reduce the risk of profile deformation and warping. The air cooling section uses a first necking channel, which uses cross-sectional contraction to accelerate the airflow and form a relatively uniform high-speed surrounding airflow, making the aluminum profile cool more evenly and the overall heat exchange efficiency higher. The water cooling section uses a ring-shaped water spray assembly to spray water from all sides, which provides uniform circumferential cooling and reduces the temperature difference between the top and bottom, helping to reduce the probability of bending deformation. At the same time, a waste heat recovery mechanism is set up to recover the waste heat in the cooling process to heat the drying hot air, which can effectively remove residual moisture on the surface of the profile after water cooling, helping to reduce surface defects caused by water entering subsequent processes and improving product quality. 2. By setting up an air extraction component to create a slight negative pressure in the first constricted channel, on the one hand, hot air can be prevented from overflowing from the channel inlet, improving the workshop working environment; on the other hand, it can further enhance the airflow velocity in the channel, strengthen the Venturi effect, and improve the cooling effect. 3. By installing a flow equalization plate inside the air distribution box, the air volume of each air outlet duct can be made more uniform, avoiding uneven air volume caused by the difference in resistance of each branch duct, preventing the flow field in the first constriction channel from becoming turbulent, thereby ensuring the stable performance of the Venturi effect, maintaining uniform surrounding airflow and stable cooling effect. 4. By setting an annular air knife at the output end of the water-cooling section, most of the water droplets on the surface of the profile can be blown away, effectively reducing the load on the subsequent drying section and improving the overall dehydration and drying efficiency; by adopting a second necking channel, the Venturi effect can be used to accelerate the hot air, enhance the convection drying effect, and improve the drying efficiency. 5. By using a hot air flow direction opposite to the profile conveying direction (counter-current drying method), a large temperature difference between the hot air and the profile surface is maintained throughout the entire heat exchange process, resulting in higher heat exchange efficiency, faster drying speed, and better drying uniformity. 6. By setting up a three-stage heat exchange mechanism, the waste heat of hot water, steam and hot air is recovered in sequence, and the energy is utilized in a tiered manner, resulting in high thermal efficiency. At the same time, various types of waste heat in the cooling process are fully recovered, which improves energy utilization and reduces energy waste. Meanwhile, the heat exchange components adopt an S-shaped flow channel structure with staggered baffles, which can prolong the residence time of air, enhance the degree of turbulence, destroy the thermal boundary layer, and effectively improve the heat exchange efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a perspective view of the aluminum profile extrusion cooling device of the present invention; Figure 2 This is a top view of the aluminum profile extrusion cooling device of the present invention; Figure 3 for Figure 2 AA view; Figure 4 for Figure 3 Enlarged view of part C; Figure 5 for Figure 2 BB view; Figure 6 This is a schematic diagram of the structure of the primary heat exchange component of the present invention; Figure 7 This is a cross-sectional structural diagram of the primary heat exchange component of the present invention; Figure 8 This is an exploded structural diagram of the blower mechanism of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Air-cooled section; 11. First constriction passage; 111. Air inlet; 112. Neck; 113. Air collection section; 12. First conveyor line; 13. Exhaust assembly; 131. Air collection hood; 132. Clearance port; 133. Air outlet duct; 134. Air collection box; 1341. Air collection chamber; 1342. Pressure stabilizing chamber; 135. Flow equalization plate; 1351. Flow equalization hole; 136. Fan; 14. Flexible curtain; 2. Water-cooled section; 21. Second conveyor line; 211. Roller; 22. Annular water spray assembly; 221. Annular water pipe; 222. Spray nozzle; 23. Water tank; 231. Cold water space; 232. Water receiving space; 24. Cover; 25. Horizontal partition; 26. Annular air knife; 27. Booster pump; 3. Drying section; 31. Second constriction passage; 32. Third conveyor line; 33. Blowering mechanism; 331. Air distribution ring box; 3311. Air inlet space; 3312. Air distribution space; 332. Air supply duct; 333. Partition plate; 334. Vent hole; 4. Waste heat recovery mechanism; 41. Primary heat exchanger assembly; 42. Secondary heat exchanger assembly; 43. Tertiary heat exchanger assembly; 431. Heat exchange plate; 432. Heat exchange fins; 433. Heat exchange channel; 434. Baffle; 44. Heat exchange box; 45. Exhaust vent; 46. Blower. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Please refer to the following: Figures 1 to 8As shown, the following describes an aluminum profile extrusion cooling device provided in an embodiment of this application. The aluminum profile extrusion cooling device of the present invention is located on one side of the extruder output end and includes an air-cooling section 1, a water-cooling section 2, and a drying section 3 arranged sequentially along the aluminum profile conveying direction. The air-cooling section 1 includes a first constriction channel 11 and a first conveying line 12; the first constriction channel 11 includes an air inlet 111, a constriction neck 112, and an air collecting section 113 connected in sequence; the inner diameter of the constriction neck 112 is smaller than the inner diameters of the air inlet 111 and the air collecting section 113, increasing the airflow velocity as it passes through the constriction neck 112 and forming a uniform circumferential airflow for uniform cooling of the aluminum profile; the first conveying line 12 passes through the first constriction channel 11 and is used to convey the aluminum profile; an air extraction component 13 is provided on the outside of the air collecting section 113 to collect the hot air after air cooling, and simultaneously enhances the airflow within the first constriction neck 112, improving cooling efficiency.

[0025] Water cooling section 2 is located at the end of air cooling section 1 away from the extruder; it includes a second conveyor line 21 and multiple annular water spraying components 22; the second conveyor line 21 is used to convey aluminum profiles; the multiple annular water spraying components 22 are arranged at intervals along the conveying direction of aluminum profiles and are respectively wrapped around the outside of aluminum profiles for spraying water onto the surface of aluminum profiles from a circumferential perspective. The drying section 3 is located at the end of the water-cooled section 2 away from the air-cooled section 1; it includes a blower mechanism 33 for blowing hot air onto the surface of the aluminum profile; the water-cooled section 2 is provided with a waste heat recovery mechanism 4 for heating the hot air in the drying section 3.

[0026] During implementation, the high-temperature aluminum profile extruded by the extruder is fed into the air-cooling section 1 via the first conveyor line 12. Within the first necking channel 11, the airflow velocity gradually increases as it flows from the air inlet 111 to the necking channel 112, forming a uniform circumferential airflow that provides initial and uniform cooling to the aluminum profile. The cooled hot air is collected by the extraction assembly 13. The profile then enters the water-cooling section 2, where multiple annular water spray assemblies 22 spray water onto the profile surface from all sides for rapid cooling. Finally, the profile enters the drying section 3, where hot air heated by the waste heat recovery mechanism 4 is blown onto the profile through the blower assembly 33 to remove residual moisture from the surface.

[0027] By employing a pre-air cooling followed by water cooling method, the large thermal shock caused by direct contact between the high-temperature profile and cooling water is avoided. This effectively reduces internal stress, lowers the risk of profile deformation and warping, and improves dimensional accuracy and yield. It should be noted that existing technologies often use ordinary fans for direct airflow, resulting in uneven airflow distribution, with localized high and low wind speeds, leading to inconsistent circumferential cooling and excessively high temperatures in some areas. In contrast, this invention accelerates the overall airflow through the cross-sectional contraction of the first constriction channel 11, forming a more uniform, high-speed circumferential airflow at the constriction neck 112. This results in a more consistent airflow velocity distribution along the entire circumference, more uniform cooling, and higher overall heat exchange efficiency. Furthermore, the annular water spray assembly 22 sprays water 360 degrees around the aluminum profile for uniform circumferential cooling, reducing the temperature difference between the top and bottom and helping to lower the probability of bending deformation. The waste heat recovery mechanism 4 recovers waste heat from the cooling process to heat the drying air, effectively removing residual moisture from the profile surface after water cooling. This helps reduce surface defects caused by water entering subsequent processes and improves product quality.

[0028] It should be noted that the inner diameter of the air inlet 111 gradually decreases along the airflow direction until it connects with the constriction 112, while the inner diameter of the air collecting part 113 gradually increases along the airflow direction, thus forming a Venturi-like structure. Specifically, the inner diameter of the constriction 112 can be set to 1 / 2 to 2 / 3 of the inner diameter of the inlet of the air inlet 111, so that the airflow velocity increases significantly when it passes through the constriction 112, and a relatively uniform circumferential airflow is formed.

[0029] In this embodiment, the air extraction assembly 13 includes an air collection hood 131, which covers the outside of the air collection section 113. The hood 131 has a clearance opening 132 in its center for the first conveyor line 12 and the aluminum profile to pass through. Multiple air outlet pipes 133 are connected to the side wall of the air collection hood 131, and these pipes are evenly arranged circumferentially around the hood 131. An air collecting box 134 is connected to the side of the multiple air outlet pipes 133 away from the air collection hood 131. One end of the air collecting box 134 has an air outlet for connecting to the suction fan 136.

[0030] During implementation, the suction fan 136 creates a slight negative pressure in the first constricted channel 11. This prevents hot air from overflowing from the channel inlet and enhances the airflow velocity within the channel, thereby strengthening the Venturi effect (i.e., utilizing the principle that the flow velocity increases and the pressure decreases when the fluid passes through the constricted section, causing the airflow to accelerate at the constricted neck 112 and form a uniform high-speed surrounding airflow, thus enhancing convective heat transfer) and improving the cooling effect.

[0031] Preferably, a flexible baffle 14 is provided at the clearance opening 132. The flexible baffle 14 can be a silicone curtain, a high-temperature resistant brush curtain, or other structures. Although the flexible baffle 14 cannot completely seal the clearance opening 132, it can block most of the hot air from escaping, effectively reducing air leakage and improving the efficiency of hot air collection, while not obstructing the normal passage of the aluminum profile and the conveyor line.

[0032] Preferably, the air distribution box 134 is annular, with a flow equalization plate 135 inside, and multiple flow equalization holes 1351 on the flow equalization plate 135. The flow equalization plate 135 divides the interior of the air distribution box 134 into an air distribution cavity 1341 and a pressure stabilizing cavity 1342, wherein multiple air outlet pipes 133 are connected to the air distribution cavity 1341, and the suction fan 136 is connected to the pressure stabilizing cavity 1342 through a pipe. In implementation, multiple streams of hot air first enter the air distribution cavity 1341 for preliminary mixing, and then flow evenly into the pressure stabilizing cavity 1342 through the flow equalization holes 1351. After the pressure stabilizes, it is then extracted by the suction fan 136, resulting in a relatively uniform and stable airflow. This flow equalization and pressure stabilization structure can avoid uneven airflow caused by differences in the resistance of each air outlet pipe 133, prevent turbulence in the flow field within the first constriction channel 11, thereby ensuring the stable performance of the Venturi effect and maintaining a uniform surrounding airflow and a stable cooling effect.

[0033] In this embodiment, the water-cooling section 2 further includes a water tank 23 and a cover 24. The second conveyor line 21 includes multiple rollers 211, which are spaced apart along the conveying direction of the aluminum profile and rotatably mounted on the top of the water tank 23 for supporting and conveying the aluminum profile. Multiple annular water spray components 22 are spaced apart along the conveying direction of the aluminum profile and surround the outer side of the aluminum profile for spraying water circumferentially onto the surface of the aluminum profile. Each annular water spray component 22 is fixedly connected to the water tank 23 via a connecting rod. The cover 24 is placed on the top of the water tank 23, covering the spray area inside, which can reduce water mist overflow and facilitate the collection of vaporized steam.

[0034] During implementation, the aluminum profile is supported and conveyed forward by multiple rollers 211, passing sequentially through various sets of annular water spray components 22. The annular water spray components 22 spray cooling water onto the surface of the aluminum profile from all sides, quickly removing heat. The sprayed water falls downwards into the water tank 23, where some of the water vaporizes upon heating, forming steam that rises to the top space of the enclosure 24. The annular water spray components 22 include annular water pipes 221 and multiple spray nozzles 222, which are evenly arranged circumferentially along the inner wall of the annular water pipes 221. The spray nozzles 222 can be selected from existing gas-liquid coaxial nozzles. These nozzles can simultaneously spray high-pressure water and high-pressure air, forming a water mist with better atomization and more uniform cooling. Furthermore, the cooling intensity can be flexibly controlled by adjusting the gas-liquid ratio, making them more widely applicable.

[0035] Preferably, the output end of the water-cooling section 2 is equipped with an annular air knife 26, which surrounds the outside of the aluminum profile and can blow away some residual water droplets on the surface of the aluminum profile, reducing the load on the subsequent drying section 3. It should be noted that the annular air knife 26 is a commonly used airflow dehydration device in the prior art. It usually has an annular air chamber inside and continuous slits in the circumference. After compressed air is introduced, it can form a uniform annular high-speed air curtain. In this embodiment, the annular air knife 26 is fixedly connected to the water tank 23 by a fixed bracket and surrounds the outside of the aluminum profile; the input end of the annular air knife 26 is connected to an external air pressurization device (such as a booster pump 27 or an air compressor). In practice, after the high-pressure air enters the annular air knife 26, it is ejected at high speed from the circumferential slits to form a uniform annular air curtain, which blows onto the surface of the aluminum profile and blows off the water droplets attached to the surface. This will not be described in detail here.

[0036] Preferably, the water tank 23 has a transverse partition 25 inside, which divides the internal space of the water tank 23 into a lower cold water space 231 and an upper water receiving space 232. Multiple annular water spray components 22 are connected to the cold water space 231 via pipes and a pump body. It should be noted that when a coaxial gas-liquid nozzle is used, an air pump is also provided. The air pump is connected to the air passage of each annular water spray component 22 via pipes to provide high-pressure air.

[0037] In implementation, taking the coaxial gas-liquid nozzle as an example, the booster pump 27 draws cold water from the cold water space 231, pressurizes it, and sends it into the water path of the annular water spray assembly 22; simultaneously, the air pump provides high-pressure air into the air path; the water and air mix at the nozzle to form atomized water mist, which is sprayed onto the surface of the aluminum profile from all sides, resulting in fast and uniform cooling. The hot water after spraying falls into the water receiving space 232. It should be noted that by setting the transverse partition 25, the water receiving space 232 and the cold water space 231 are independent of each other and not connected. The hot water collected in the water receiving space 232 can be sent to the external cooling tower for cooling through pipelines, and the cooled water then flows back to the lower cold water space 231 for recycling, thereby ensuring the relative stability of the spray water temperature.

[0038] In this embodiment, the drying section 3 further includes a second constriction channel 31 and a third conveyor line 32. The third conveyor line 32 passes through the second constriction channel 31 and is used to convey aluminum profiles. The second constriction channel 31 has the same structure as the first constriction channel 11 and is arranged in a mirror image of the first constriction channel 11. It should be noted that the mirror image arrangement means that the structural shape of the second constriction channel 31 is consistent with that of the first constriction channel 11, but the arrangement direction is opposite: the air inlet 111 of the first constriction channel 11 is located on the side away from the water-cooling section 2, and the air collecting part 113 is located on the side close to the water-cooling section 2; while the air inlet side of the second constriction channel 31 is located on the side away from the water-cooling section 2, and the air outlet side is located on the side close to the water-cooling section 2, and the two are symmetrically arranged relative to the water-cooling section 2. In this way, the drying section 3 can also use the constriction structure to accelerate the airflow, enhance the convective drying effect, and improve the drying efficiency; while the blower mechanism 33 is fixed at the end of the second constriction channel 31 away from the water-cooling section 2. The function of the blower mechanism 33 is to evenly send the hot air, which has been heated by waste heat recovery, into the second constriction channel 31, providing a heat source and airflow power for drying.

[0039] It should be noted that, since the hot air is supplied from the end of the second constriction channel 31 furthest from the water-cooling section 2, it flows in the opposite direction along the channel (opposite to the profile conveying direction), forming counter-current heat exchange. In practice, the aluminum profile enters the second constriction channel 31 from the end closest to the water-cooling section 2 and is conveyed away from the water-cooling section 2; while the hot air is supplied from the end furthest from the water-cooling section 2 and flows towards the water-cooling section 2, with the two flow directions opposite. During the flow, the higher-temperature hot air first contacts the pre-dried profile end, which has a relatively high surface temperature. As the hot air flows forward along the channel, its temperature gradually decreases, and it successively contacts the lower-temperature profile front section with a higher moisture content. This counter-current heat exchange method ensures that the hot air and the profile surface maintain a large temperature difference throughout the entire heat exchange process, resulting in higher heat exchange efficiency and faster drying speed.

[0040] Specifically, the blower mechanism 33 includes an air distribution ring box 331. Multiple air supply pipes 332 are provided on one side of the air distribution ring box 331. These multiple air supply pipes 332 are evenly arranged circumferentially along the air distribution ring box 331, and their output ends extend along the aluminum profile conveying direction towards the central axis of the second necking channel 31. Preferably, the air distribution ring box 331 has a partition plate 333 inside, with multiple vents 334 evenly distributed on the partition plate 333. The partition plate 333 divides the interior of the air distribution ring box 331 into an air inlet space 3311 and an air distribution space 3312. The multiple air supply pipes 332 are connected to the air distribution space 3312, and the hot air output end is connected to the air inlet space 3311.

[0041] During implementation, hot air first enters the air inlet space 3311, then flows evenly into the air distribution space 3312 through the vents 334 on the partition plate 333, and finally exits evenly from each air supply pipe 332, resulting in relatively uniform circumferential air distribution. In this way, the air distribution ring box 331 and the partition plate 333 ensure the uniformity of the initial air supply. After the airflow enters the second constriction channel 31, it is further accelerated as it passes through the constriction, forming a uniform and stable high-speed circumferential airflow. This not only ensures the uniformity of circumferential drying but also enhances convective heat transfer through high air velocity, significantly improving drying efficiency.

[0042] In this embodiment, the waste heat recovery mechanism 4 includes a primary heat exchange component 41, a secondary heat exchange component 42, and a tertiary heat exchange component 43 connected in sequence. The primary heat exchange component 41 is fixed within the water receiving space 232, used for heat exchange between external air and the hot water within the space 232. The secondary heat exchange component 42 is fixed to the inner wall of the top of the enclosure 24, used for heat exchange between the air after the primary heat exchange and the steam inside the enclosure 24. The tertiary heat exchange component 43 is located at the top of the enclosure 24, used for heat exchange between the air after the secondary heat exchange and the hot air extracted by the extraction component 13. The heat-exchanged air is then transported to the drying section 3 via a blower 46 and pipelines, used as drying hot air.

[0043] Understandably, each of the primary heat exchanger 41, secondary heat exchanger 42, and tertiary heat exchanger 43 is equipped with an air inlet and an air outlet. Specifically, the air inlet of the primary heat exchanger 41 is connected to fresh external air, and its air outlet is connected to the air inlet of the secondary heat exchanger 42 via a pipe. The air outlet of the secondary heat exchanger 42 is connected to the air inlet of the tertiary heat exchanger 43 via a pipe. The air outlet of the tertiary heat exchanger 43 is connected to the blower mechanism 33 of the drying section 3 via a pipe and a blower 46. The air passes sequentially through the primary heat exchanger 41, secondary heat exchanger 42, and tertiary heat exchanger 43, and is heated stage by stage.

[0044] In this embodiment, the primary heat exchange assembly 41, the secondary heat exchange assembly 42, and the tertiary heat exchange assembly 43 have the same structure, all including a heat exchange plate 431. The outer wall of the heat exchange plate 431 is provided with heat exchange fins 432, and the interior of the heat exchange plate 431 is provided with a heat exchange channel 433. Multiple baffles 434 are provided in the heat exchange channel 433, and the multiple baffles 434 are arranged alternately, so that the air flows along an S-shaped path in the heat exchange channel 433, which can prolong the residence time of the air and enhance the heat exchange effect.

[0045] In this embodiment, a heat exchange box 44 is provided at the top of the cover 24, and a three-stage heat exchange assembly 43 is fixedly installed inside the heat exchange box 44. The output end of the exhaust assembly 13 is connected to the heat exchange box 44, and an exhaust port 45 is provided at the top of the heat exchange box 44. The output end of the three-stage heat exchange assembly 43 is connected to the blower assembly 33 of the drying section 3. In practice, the hot air extracted by the exhaust assembly 13 enters the heat exchange box 44 and exchanges heat with the air inside the three-stage heat exchange assembly 43. The cooled hot air is discharged from the top exhaust port 45.

[0046] It should be noted that in the waste heat recovery process of this embodiment, the fresh air is heated step by step from low to high temperature. Specifically, the first stage is preheating (hot water heat exchange): ambient temperature fresh air (about 25~35℃) first enters the heat exchange channel 433 of the first-stage heat exchange component 41 and exchanges heat with the hot water (about 45~65℃) in the water receiving space 232, and the air is initially preheated; the second stage is heating (steam heat exchange): the air that has been preheated in the first stage enters the second-stage heat exchange component 42 through the pipeline and exchanges heat with the high-temperature steam (about 70~90℃) generated by vaporization in the hood 24, absorbing the heat of the steam, and the air temperature is further increased to about 65~85℃; the third stage is heating (air-cooled hot air heat exchange): the air that has been heated in the second stage continues to enter the third-stage heat exchange component 43 and exchanges heat with the high-temperature hot air (about 150~250℃) extracted from the air-cooled section 1 by the exhaust component 13, and the air temperature is further increased to about 100~120℃. The cooled hot air is discharged from the exhaust port 45 at the top of the heat exchange box 44.

[0047] Then, the hot air, after being heated in three stages, is sent by the blower 46 through the pipeline into the air distribution ring box 331 of the drying section 3 as a heat source for drying. In case of low winter temperatures or insufficient residual heat, supplementary heating devices (such as electric heaters, steam coils, etc.) can be added to the pipeline to further heat the hot air to the target drying temperature to ensure the stability of the drying effect.

[0048] In this way, through a three-stage heat exchange method, waste heat of three different grades—hot water, steam, and hot air—is recovered sequentially, achieving tiered energy utilization, high thermal efficiency, and significant energy-saving effects. At the same time, various types of waste heat during the cooling process are fully recovered, greatly improving energy utilization and reducing energy waste.

[0049] In a specific implementation of this invention, the high-temperature aluminum profile (approximately 400-550°C) extruded by the extruder moves forward under the action of extrusion pressure and is supported by the first conveyor line 12 to enter the first constriction channel 11 of the air-cooling section 1. At this time, external air is introduced into the first constriction channel 11 from the air inlet 111 through the exhaust assembly 13. As the external air flows along the first constriction channel 11 towards the constriction neck 112, the airflow velocity gradually increases due to the gradual contraction of the cross-section of the first constriction channel 11, forming a circumferentially uniform high-speed surrounding airflow in the constriction neck 112, which uniformly and initially cools the surface of the aluminum profile. The cooled hot air enters the air collecting section 113, is collected by the exhaust assembly 13, and is then sent to the heat exchange box 44.

[0050] When the air extraction assembly 13 is working, it creates a slight negative pressure state in the first constricted channel 11, which enhances the airflow velocity in the channel, strengthens the Venturi effect, and improves the cooling effect. The flow equalization plate 135 and the pressure stabilizing chamber 1342 in the air distribution box 134 can make the air volume of each air outlet 133 more uniform, avoid turbulent flow field in the channel, and ensure the stability of the Venturi effect.

[0051] After initial air cooling, the aluminum profiles continue to move forward and enter the water cooling section 2, where they are supported and transported by multiple rollers 211 of the second conveyor line 21. The booster pump 27 draws cold water from the cold water space 231, pressurizes it, and sends it to each annular water spray assembly 22, which sprays it onto the surface of the aluminum profiles from all sides in a 360-degree manner for rapid forced cooling.

[0052] After spraying, the hot water falls into the upper water receiving space 232 for collection. Some of the water is heated and vaporized to form steam, which rises to the top space of the cover 24. The hot water collected in the water receiving space 232 is sent to the external cooling tower through pipelines for cooling. The cooled water then flows back to the lower cold water space 231 for recycling, thereby ensuring the relative stability of the spray water temperature.

[0053] After being water-cooled, the aluminum profile continues to move forward. When it passes the annular air knife 26 at the output end of the water-cooling section 2, high-pressure air is ejected at high speed from the circumferential slits of the annular air knife 26, forming a uniform annular air curtain. This blows off most of the water droplets adhering to the surface of the aluminum profile, completing the initial mechanical dehydration and effectively reducing the load on the subsequent drying section 3. The aluminum profile, having undergone initial dehydration by the annular air knife 26, continues to move forward and enters the drying section 3, where it is supported and conveyed by the third conveyor line 32.

[0054] During this process, fresh external air passes sequentially through the primary heat exchanger 41, the secondary heat exchanger 42, and the tertiary heat exchanger 43, being heated step-by-step from low to high temperature. The hot air, after being heated in three stages, is then delivered by the blower 46 through pipes into the air distribution ring box 331 of the drying section 3, serving as a heat source for drying. The hot air enters from the end of the second necking channel 31 furthest from the water-cooling section 2, flowing counter-currently along the channel (opposite to the profile conveying direction). The partition plate 333 and the uniform air distribution space 3312 within the air distribution ring box 331 ensure the uniformity of the initial circumferential airflow. After entering the second necking channel 31, the airflow is further accelerated as it flows through the necking section 112, forming a uniform and stable high-speed circumferential airflow that convectively dries the surface of the aluminum profile, removing residual moisture. The dried aluminum profile exits from the end of the second necking channel 31 closest to the water-cooling section 2, and proceeds to subsequent processes such as straightening, sawing, and aging.

[0055] It should be noted that the first conveyor line 12, the second conveyor line 21, and the third conveyor line 32 in this embodiment are all existing technologies, mainly including multiple conveyor rollers and support brackets. The conveyor lines can be in a driven form, where the conveyor rollers only provide support, and the aluminum profile moves forward under the extrusion pressure of the extruder, causing the conveyor rollers to rotate accordingly; or they can be in an active form, where the conveyor rollers are connected to a drive motor, which drives the conveyor rollers to rotate actively, thereby conveying the aluminum profile. Both forms can be selected according to actual production needs, and will not be elaborated further here.

[0056] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cooling and heat dissipation device for aluminum profile extrusion, characterized in that, include: The air-cooling section is located on one side of the extruder output end; it includes a first necking channel and a first conveyor line; the first necking channel includes an air inlet, a neck, and an air collecting section connected in sequence; the inner diameter of the neck is smaller than the inner diameters of the air inlet and the air collecting section, so that the airflow velocity increases when it flows through the neck and forms a circumferentially uniform surrounding airflow to uniformly cool the aluminum profile; an air extraction component is provided on the outside of the air collecting section; the first conveyor line passes through the first necking channel and is used to transport the aluminum profile; A water-cooled section is located at the end of the air-cooled section away from the extruder; it includes a second conveyor line and multiple annular water spray assemblies; the second conveyor line is used to convey aluminum profiles; the multiple annular water spray assemblies are arranged at intervals along the conveying direction of the aluminum profiles and are respectively surrounding the outside of the aluminum profiles for spraying water onto the surface of the aluminum profiles from a circumferential perspective. A drying section is located at the end of the water-cooled section away from the air-cooled section; it includes a blower mechanism for blowing hot air onto the surface of the aluminum profile; the water-cooled section is provided with a waste heat recovery mechanism for heating the hot air in the drying section.

2. The aluminum profile extrusion cooling and temperature reduction device according to claim 1, characterized in that, The air extraction assembly includes an air collection hood, which covers the outside of the air collection section; the air collection hood has a clearance opening in the middle for the first conveyor line and aluminum profile to pass through; the side wall of the air collection hood is connected to a plurality of air outlet pipes, which are evenly arranged around the circumference of the air collection hood; an air collecting box is connected to the side of the plurality of air outlet pipes away from the air collection hood, and one end of the air collecting box has an air outlet for connecting to the suction fan.

3. The aluminum profile extrusion cooling and temperature reduction device according to claim 2, characterized in that, The air collecting box is ring-shaped, and an air equalization plate is provided inside the air collecting box. The air equalization plate has multiple air equalization holes. The air equalization plate divides the interior of the air collecting box into an air collecting chamber and a pressure stabilizing chamber. Multiple air outlet pipes are connected to the air collecting chamber, and the suction fan is connected to the pressure stabilizing chamber through a pipe.

4. The aluminum profile extrusion cooling and temperature reduction device according to claim 1, characterized in that, The water-cooling section also includes a water tank and a cover; the second conveyor line includes multiple rollers, which are arranged at intervals along the conveying direction of the aluminum profile and are rotatably mounted on the top of the water tank; multiple annular water spray assemblies are respectively fixedly connected to the water tank via connecting rods; the cover is installed on the top of the water tank.

5. The aluminum profile extrusion cooling and temperature reduction device according to claim 4, characterized in that, The output end of the water-cooling section is equipped with an annular air knife, which surrounds the outside of the aluminum profile and is used to blow away residual water droplets on the surface of the aluminum profile.

6. The aluminum profile extrusion cooling and temperature reduction device according to claim 4, characterized in that, The water tank is equipped with a horizontal partition, which divides the internal space of the water tank into a lower cold water space and an upper water receiving space; multiple annular water spray components are connected to the cold water space through pipelines and a booster pump.

7. The aluminum profile extrusion cooling and temperature reduction device according to claim 6, characterized in that, The waste heat recovery mechanism includes a primary heat exchange component, a secondary heat exchange component, and a tertiary heat exchange component connected in sequence. The primary heat exchange component is fixed in the water receiving space and is used to exchange heat between the external air and the hot water in the water receiving space. The secondary heat exchange component is fixed on the inner wall of the top of the hood and is used to exchange heat between the air after the primary heat exchange and the steam inside the hood. The tertiary heat exchange component is located at the top of the hood and is used to exchange heat between the air after the secondary heat exchange and the hot air extracted by the exhaust component. The air after heat exchange is transported to the drying section through a blower and pipelines.

8. The aluminum profile extrusion cooling and temperature reduction device according to claim 7, characterized in that, The primary heat exchange assembly includes a heat exchange plate with heat exchange fins on its outer wall and a heat exchange channel inside the heat exchange plate. Multiple baffles are provided inside the heat exchange channel, and the multiple baffles are arranged alternately to allow air to flow along an S-shaped path inside the heat exchange channel.

9. The aluminum profile extrusion cooling and temperature reduction device according to claim 8, characterized in that, The top of the cover is provided with a heat exchange box, and the three-stage heat exchange assembly is fixed inside the heat exchange box; the output end of the air extraction assembly is connected to the heat exchange box, and the top of the heat exchange box is provided with an exhaust port; the output end of the three-stage heat exchange assembly is connected to the blower assembly of the drying section.

10. The aluminum profile extrusion cooling and temperature reduction device according to claim 9, characterized in that, The drying section further includes a second constriction channel and a third conveyor line; the third conveyor line passes through the second constriction channel and is used to convey aluminum profiles; the second constriction channel has the same structure as the first constriction channel and is arranged in a mirror image of the first constriction channel; the blower mechanism is fixed at one end of the second constriction channel away from the water-cooling section; the blower mechanism includes an air distribution ring box, and a plurality of air supply pipes are provided on one side of the air distribution ring box. The plurality of air supply pipes are evenly arranged along the circumference of the air distribution ring box, and the output ends of the plurality of air supply pipes extend along the aluminum profile conveying direction toward the central axis of the second constriction channel.

Images