A plastic plate gradient cooling device based on water cooling and aerosol cooling combination

Abstract

This invention discloses a gradient cooling device for plastic sheets based on a combination of water cooling and aerosol cooling, comprising: a housing integrally formed from an aerosol box and a water-cooling box, wherein the aerosol box and the water-cooling box are arranged sequentially along the conveying direction of the plastic sheet; an aerosol assembly symmetrically arranged on the upper and lower sides inside the aerosol box for spraying aerosol onto the plastic sheet for aerosol cooling; a water-cooling assembly disposed inside the water-cooling box, the water-cooling assembly including upper and lower water-cooling rollers for water cooling the plastic sheet; and a conveying assembly for conveying the plastic sheet from the aerosol box to the water-cooling box. This invention, by combining aerosol cooling and water cooling, can not only rapidly reduce the surface temperature of the plastic sheet but also reduce deformation or stress concentration problems caused by excessive temperature differences.

Description

Technical Field

[0001] This invention relates to the field of plastic sheet production technology, specifically a gradient cooling device for plastic sheets based on a combination of water cooling and air mist cooling. Background Technology

[0002] Currently, in the extrusion or injection molding production of plastic sheets (such as extruded polystyrene sheets and polypropylene sheets), the cooling process is a crucial step in ensuring the dimensional stability, mechanical properties, and surface quality of the sheets. Common cooling methods include natural cooling, air cooling, water cooling, and spray cooling. Among these, air cooling, while simple in structure, has relatively low cooling efficiency; direct water cooling, although providing rapid heat exchange, can easily lead to a sudden drop in surface temperature, generating thermal stress and causing warping or microcracks. To balance cooling efficiency and quality, the industry has developed aerosol (water mist) cooling technology, which achieves rapid and relatively uniform cooling through the phase change heat absorption of tiny water droplets.

[0003] For example, patent CN211467421U discloses a rapid cooling device for extruded polystyrene (XPS) boards, including a heat sink frame, horizontal conveyor rollers mounted on the heat sink frame, and an atomizing device. Multiple horizontal conveyor rollers are installed parallel to each other on the heat sink frame, with the atomizing device positioned opposite the upper and lower sides of each roller. An exhaust fan surrounds the heat sink frame. This device uses water mist generated by the atomizing device to exchange heat with the XPS board on the conveyor rollers, turning the water mist into water vapor, which is then discharged by the exhaust fan. This ensures more thorough contact between the water mist and the XPS board, and combined with the exhaust fan's heat dissipation, results in a significant cooling effect. Furthermore, the contact between the water mist and the XPS board is more uniform, ensuring that almost all parts of the board are exposed to water mist at the same temperature simultaneously, thus preventing bending, deformation, or even cracking of the XPS board due to uneven cooling.

[0004] However, the aforementioned single-water-mist cooling solution still has significant shortcomings in practical applications: the water mist only acts on the surface of the plastic sheet, relying on surface-to-internal heat conduction to gradually dissipate heat, making it difficult for internal heat to dissipate in a timely manner. As a result, the surface of the sheet often cools below the required process temperature, while the interior remains at a higher temperature, creating a large temperature gradient. This "cold outside, hot inside" phenomenon not only prolongs the overall cooling time and reduces production efficiency but also easily accumulates residual thermal stress inside the sheet, inducing quality problems such as slow deformation and stress cracking during subsequent storage or use.

[0005] Therefore, a gradient cooling device for plastic sheets based on a combination of water cooling and aerosol cooling is proposed to address the above problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the problems mentioned in the background art, this invention proposes a gradient cooling device for plastic sheets based on a combination of water cooling and aerosol cooling.

[0007] A gradient cooling device for plastic sheets based on a combination of water cooling and aerosol cooling, comprising: The box body is integrally formed from an aerosol box and a water-cooled box, and the aerosol box and the water-cooled box are arranged sequentially along the conveying direction of the plastic sheet. The aerosol components are symmetrically arranged on the upper and lower sides inside the aerosol box, and are used to spray aerosol onto the plastic sheet for aerosol cooling. A water-cooling assembly is disposed inside the water-cooling box. The water-cooling assembly includes water-cooling rollers arranged at the top and bottom, and the water-cooling rollers are used to water-cool the plastic sheet. A conveying assembly for conveying plastic sheets from the aerosol box to the water-cooled box.

[0008] A transition processing unit is disposed at the connection position between the aerosol box and the water-cooled box. The transition processing unit includes a movable housing and an exhaust fan disposed within the movable housing for discharging gas from the aerosol box.

[0009] A further technical improvement of the present invention is that: the end of the movable shell facing the inside of the box is open, and the end of the movable shell facing the outside of the box is closed; an installation plate is provided in the inner cavity of the movable shell, and multiple exhaust fans are evenly distributed on the installation plate; an air collection hood is fixed to the outside of the closed end of the movable shell, and an air supply pipe is fixed to the air collection hood; an air hole for connecting its inner cavity and the inner cavity of the air collection hood is opened on the closed end of the movable shell; an air inlet groove is opened on the side wall of the movable shell facing the aerosol box.

[0010] A further technical improvement of the present invention is that: a partition is provided inside the movable housing and between the closed end and the exhaust fan, the partition dividing the inner cavity of the movable housing into a left chamber adjacent to the aerosol box and a right chamber adjacent to the water-cooling box; the air hole communicates with the left chamber; an air supply cavity is provided inside the side wall of the movable housing facing the water-cooling box, the side of the air supply cavity near the closed end of the movable housing communicates with the right chamber, and the side of the air supply cavity near the open end of the movable housing is open and inclined towards the aerosol box.

[0011] A further technical improvement of the present invention is that: vertical rods are fixed at both ends of the mounting plate, the ends of the vertical rods extend through to the outside of the closed end of the movable housing, and a crossbeam is fixed between the ends of the two vertical rods; hydraulic cylinders three are fixed on the upper and lower sides of the housing, and the ends of the telescopic rods of the hydraulic cylinders three are fixedly connected to the crossbeams through fixing rods.

[0012] A further technical improvement of the present invention is that: a groove is provided on the side wall of the vertical rod, and the two ends of the partition are respectively connected to the grooves on the side walls of the two vertical rods; the side of the partition facing the mounting plate is set in a dovetail shape; mounting holes are respectively opened at both ends of the mounting plate, and the end of the vertical rod is inserted through the mounting hole.

[0013] A further technical improvement of the present invention is that the vertical rod is a hollow tube, and a drainage block is fixed at the bottom end of the upper vertical rod.

[0014] A further technical improvement of the present invention is that: limit plates are symmetrically arranged on both sides of the aerosol box, and a hydraulic cylinder for adjusting the position of the limit plates is fixed on the outer wall of the aerosol box.

[0015] A further technical improvement of the present invention is that: a diversion plate is provided on the top inner wall of the aerosol box, the diversion plate is configured as a triangular cone, a water collection trough is fixed on the inner wall of the end of the aerosol box away from the water cooling box, and a drain pipe is provided on the side wall of the aerosol box.

[0016] A further technical improvement of the present invention is that: a U-shaped connecting frame is provided on the upper and lower sides of the inner cavity of the water-cooled box, and a hydraulic cylinder for driving the connecting frame is fixed on the upper and lower outer walls of the water-cooled box; a connecting seat is provided at both ends of the water-cooling rollers on the upper and lower sides, and the connecting seat is connected to the connecting frame through a connecting rod.

[0017] A further technical improvement of the present invention is that: the two ends of the connecting rod located below are fixedly connected to the connecting seat and the connecting frame respectively; one end of the connecting rod located above is fixedly connected to the connecting seat, and the other end is slidably inserted into the sliding cavity opened at the end of the connecting frame, and a spring is sleeved on the connecting rod located above.

[0018] The advantages of this invention are: 1. This invention achieves gradient cooling of plastic sheets by combining aerosol cooling and water cooling. In use, aerosol nozzles evenly spray aerosol onto the surface of the plastic sheet. The aerosol evaporates rapidly upon contact with the hot plastic sheet surface, carrying away a large amount of heat and achieving initial cooling. Subsequently, water-cooled rollers positioned above and below contact the surface of the plastic sheet, and the circulating cooling medium further reduces the internal temperature of the plastic sheet, completing the gradient cooling process. This not only rapidly reduces the surface temperature of the plastic sheet but also reduces deformation or stress concentration problems caused by excessive temperature differences.

[0019] 2. This invention uses a transition processing unit to draw hot and humid air from the aerosol box into the inner cavity of the movable shell, and then guides it through an air hole into a gas collection hood, and then through a gas delivery pipe into an external gas recovery device for further processing or discharge. This avoids the direct discharge of hot and humid air, which would otherwise waste resources. In addition, by using the transition processing unit, the hot and humid air inside the aerosol box can be prevented from entering the water-cooling box, thus avoiding interference with the normal operation of the water-cooling roller.

[0020] 3. This invention uses a partition to guide the hot and humid air drawn into the inner cavity of the movable shell into the left and right chambers respectively. A portion of the hot and humid air is discharged outward through the left chamber, air hole, air collection hood and air delivery pipe, while the other portion of the hot and humid air enters the air delivery cavity through the right chamber and is discharged through the inclined opening at the bottom of the air delivery cavity. This allows the air to be blown obliquely onto the surface of the plastic sheet, achieving reverse blowing to clean the residual water on the surface of the plastic sheet and break the continuous water film on the surface of the plastic sheet. This allows the plastic sheet to directly contact the water-cooled roller, thereby improving the cooling efficiency. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention from another angle; Figure 3 This is a partial cross-sectional view of the water mist box in this invention; Figure 4 This is a partial cross-sectional view of the water-cooled box in this invention; Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a cross-sectional view of the movable housing in this invention; Figure 7 This is a side sectional view of the upper movable housing in this invention; Figure 8 This is a partial structural diagram of the present invention; Figure 9 for Figure 8 Enlarged view of the structure at point B in the middle; Figure 10 A schematic diagram showing the connection position of the vertical rod and the diversion block in this invention; Figure 11A cross-sectional view of the lower movable housing in this invention.

[0023] In the diagram: 1. Aerosol box; 2. Water-cooled box; 3. Aerosol assembly; 4. Water-cooled roller; 5. Movable shell; 6. Conveying assembly; 7. Hydraulic cylinder one; 8. Limiting plate; 9. Drainage plate; 10. Water collection tank; 11. Hydraulic cylinder two; 12. Connecting frame; 13. Connecting seat; 14. Connecting rod; 15. Spring; 16. Hydraulic cylinder three; 17. Fixing rod; 18. Crossbeam; 19. Vertical rod; 20. Mounting plate; 21. Exhaust fan; 22. Partition plate; 23. Left chamber; 24. Right chamber; 25. Air delivery cavity; 26. Air hole; 27. Air collection hood; 28. Air delivery pipe; 29. ​​Groove; 30. Drainage block. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-4 As shown, a gradient cooling device for plastic sheets based on a combination of water cooling and aerosol cooling includes: The box body is integrally formed from an aerosol box 1 and a water-cooled box 2, and the aerosol box 1 and the water-cooled box 2 are arranged sequentially along the conveying direction of the plastic sheet. The aerosol assembly 3 is symmetrically arranged on the upper and lower sides inside the aerosol box 1, and is used to spray aerosol onto the plastic sheet for aerosol cooling. A water-cooling assembly is disposed inside the water-cooling box 2. The water-cooling assembly includes water-cooling rollers 4 arranged at the top and bottom. The water-cooling rollers 4 are used to water-cool the plastic sheet. The conveying assembly 6 is used to convey the plastic sheet from the aerosol box 1 to the water-cooled box 2.

[0026] A transition processing unit is provided at the connection position between the aerosol box 1 and the water-cooled box 2. The transition processing unit includes a movable housing 5 and an exhaust fan 21 provided in the movable housing, which is used to discharge the gas in the aerosol box 1.

[0027] In one specific embodiment, the aerosol assembly 3 includes water pipes respectively arranged on the upper and lower sides inside the aerosol cooling section, with multiple aerosol nozzles evenly distributed on each water pipe. The multiple water pipes are distributed in parallel inside the aerosol box 1, and the ends of the multiple water pipes are converged through a main pipe and connected to an external pure water tank. The pure water tank is equipped with a high-pressure pump and a filter. The inlet of the high-pressure pump is connected to the pure water tank, and the outlet is connected to the water pipes.

[0028] The number of water pipes can be reasonably set according to the length of the aerosol box 1 and the required cooling uniformity. For example, the spacing between adjacent water pipes can be selected from the range of 100 mm to 200 mm. The water pipes are usually arranged parallel to the conveying direction of the plastic sheet to facilitate the formation of a relatively uniform coverage of the aerosol in the width direction of the sheet. As an optional arrangement, the distance between the water pipe closest to the transition treatment unit and the movable housing 5 should not be too small. This helps to reduce the direct intake of unevaporated aerosol into the transition treatment unit, thereby reducing the burden on the exhaust system.

[0029] The operating pressure of the aerosol nozzle can be adjusted according to actual cooling requirements. For example, the operating pressure can be selected between 0.4 MPa and 0.6 MPa. It should be noted that too low an operating pressure may result in larger droplet sizes and decreased evaporation efficiency; too high an operating pressure may cause excessive droplet refinement and increased drift loss. Within this exemplary pressure range, droplets with a median volume diameter (D50) of approximately 30 μm to 80 μm can typically be obtained, which helps to form a relatively uniform thin water film on the plate surface, thus achieving a balance between heat exchange efficiency and droplet deposition rate to some extent.

[0030] The spray distance between the aerosol nozzle and the plastic sheet should be adjusted adaptively according to the sheet thickness, conveying speed, and site environment. For example, this spray distance can be set to 150 mm to 300 mm. If the distance is too close, the aerosol impact force is too strong, which may cause local overcooling or excessive water film on the sheet surface; if the distance is too far, the aerosol will diffuse and lose a lot before reaching the sheet surface, and the cooling effect may be reduced. Therefore, in practical applications, those skilled in the art can determine a more suitable spray distance within the above range through simple experiments.

[0031] In one specific embodiment, the water-cooled roller 4 is connected to a closed-loop cooling system, and the cooling medium is deionized water with added corrosion and scale inhibitors.

[0032] In one specific embodiment, the conveying assembly 6 includes a drive shaft rotatably mounted on the side wall of the housing, with multiple drive wheels spaced apart on the drive shaft. The drive shaft and drive wheels of the conveying assembly 6 are continuously arranged along the conveying direction of the plastic sheet. A drive device for driving the drive shaft and drive wheels to rotate is fixedly installed on the outer wall of the aerosol box 1. The drive device can be a common drive form such as a chain and sprocket structure or a drive motor to ensure that the plastic sheet maintains a stable speed and direction during the conveying process. In addition, the outer surface of the drive wheels is provided with an anti-slip layer, which can further enhance the friction between the drive wheels and the plastic sheet and ensure the smoothness of the conveying process.

[0033] The specific structure and working principle of the aerosol component 3, the water cooling component and the conveying component 6 are known prior art in this field and will not be elaborated on here.

[0034] During operation, the produced plastic sheet is fed into the aerosol box 1 through the inlet and placed on the drive wheel of the conveying assembly 6. The drive wheel propels the plastic sheet into the aerosol box 1, allowing it to pass through the gap between adjacent ends of the upper and lower movable housings 5, and then insert into the gap between the upper and lower water-cooling rollers 4. As the plastic sheet enters the aerosol box 1, the aerosol assembly 3 simultaneously begins operation, uniformly spraying aerosol onto the upper and lower surfaces of the plastic sheet through the aerosol nozzles. The aerosol evaporates rapidly upon contact with the high-temperature plastic sheet surface, carrying away a large amount of heat and achieving initial cooling. When the plastic sheet enters the water-cooling box 2, the upper and lower water-cooling rollers 4 contact the surface of the plastic sheet, and the cooling medium circulating inside the water-cooling rollers 4 further reduces the internal temperature of the plastic sheet, completing the gradient cooling process. This invention, by combining aerosol cooling and water cooling, can not only rapidly reduce the surface temperature of the plastic sheet but also reduce deformation or stress concentration problems caused by excessive temperature differences. A transition processing assembly is used to treat the gas in the aerosol box 1. In addition, by setting a transition process to discharge the gas in the aerosol box 1, it is possible to effectively prevent the accumulation of hot and humid air in the aerosol box, avoid affecting the evaporation efficiency of the aerosol due to increased humidity, and at the same time reduce the entry of hot and humid air into the water-cooled box 2, which would interfere with the cooling operation of the water-cooled roller 4.

[0035] Please see Figure 6-7 As shown, the movable housing 5 is open at one end facing the inside of the box, and closed at the other end facing the outside of the box; an installation plate 20 is provided in the inner cavity of the movable housing 5, and multiple exhaust fans 21 are evenly distributed on the installation plate 20; an air collection hood 27 is fixed to the outside of the closed end of the movable housing 5, and an air supply pipe 28 is fixed to the air collection hood 27; an air hole 26 is provided on the closed end of the movable housing 5 to connect its inner cavity and the inner cavity of the air collection hood 27; an air inlet groove is provided on the side wall of the movable housing 5 facing the aerosol box 1.

[0036] During operation, as the plastic sheet enters the gap between the two symmetrically arranged movable housings 5, the exhaust fan 21 inside the movable housing 5 is simultaneously activated. This causes the air inside the movable housing 5 to move towards the closed end and draw in the humid and hot air from the aerosol box 1 through the air inlet slot. The air is then introduced into the air collection hood 27 through the air hole 26, and then into an external gas recovery device through the air delivery pipe 28 for further processing or discharge, such as condensation recovery of the humid air and heat recovery and reuse. This effectively avoids the direct discharge of humid and hot air, preventing resource waste; it also prevents humid and hot air from entering the water-cooled box 2 and interfering with the cooling operation of the water-cooled roller 4.

[0037] Please see Figure 7As shown, a partition 22 is provided inside the movable housing 5 and between the closed end and the exhaust fan 21. The partition 22 divides the inner cavity of the movable housing 5 into a left chamber 23 adjacent to the aerosol box 1 and a right chamber 24 adjacent to the water-cooled box 2. The air hole 26 communicates with the left chamber 23. An air supply cavity 25 is provided inside the side wall of the movable housing 5 facing the water-cooled box 2. The side of the air supply cavity 25 near the closed end of the movable housing 5 communicates with the right chamber 24. The side of the air supply cavity 25 near the open end of the movable housing 5 is open and inclined towards the aerosol box 1.

[0038] The exhaust fan 21 exhausts towards the closed end of the movable housing 5 and draws in towards the open end, thereby creating a positive pressure zone near the closed end and a negative pressure zone near the open end of the movable housing 5; the length of the air inlet end of the air delivery cavity 25 matches the length of the inner cavity of the movable housing 5, causing the diameter of the air hole 26 to be smaller than the diameter of the air inlet end of the air delivery cavity 25. The partition 22 in the inner cavity of the movable housing 5 separates the positive pressure zone into the right chamber 24. The open end of the bottom of the air supply cavity 25 has a downwardly protruding inclined opening that protrudes from the open end of the movable housing 5. The right chamber 24 is connected to the inclined opening near the open end through the air supply cavity 25, making the air supply cavity 25 a bypass channel connecting the positive pressure zone and the negative pressure zone. The inclined opening of the air supply cavity 25 should face the direction of the aerosol box 1 (opposite to the direction of the plastic sheet's movement), and the distance between the inclined opening and the surface of the sheet should be 3-10 mm to ensure the impact force. The gap between the movable housing 5 and the open end plastic plate is maintained at 5-20 mm, and the movable housing 5 and the mounting plate 20 are sealed by a sealing strip to prevent air in the positive pressure zone from directly leaking to the negative pressure zone or the outside, thereby maintaining an effective pressure gradient; the exhaust fan 21 can provide a pressure difference of more than 150 Pa, so that the airflow velocity at the outlet of the air delivery cavity 25 reaches 10-30 m / s to break the continuous water film on the surface of the plate; the opening area of ​​the movable housing 5 is larger than the air intake area of ​​the exhaust fan to avoid excessive air intake resistance; During operation, some of the hot and humid air will come into contact with the side wall of the movable shell 5 and condense into water droplets. After the water droplets gather, they may drip onto the surface of the plastic sheet and remain on the surface of the sheet.

[0039] By setting a baffle 22 to divert the airflow blown out by the exhaust fan 21, the gas entering the left chamber 23 flows through the air hole 26 to the gas collection hood 27, and then through the air supply pipe 28 to be introduced into the external gas recovery device. Some of the humid and hot air is introduced into the right chamber 24, and then enters the air supply cavity 25 through the upper through slot, and is discharged through the inclined opening of the air supply cavity 25, so that the air is blown obliquely onto the surface of the plastic sheet. The direction of airflow is opposite to the direction of plastic sheet movement, realizing reverse sweeping, so as to clean the residual water on the surface of the plastic sheet, break the continuous water film on the surface of the plastic sheet, reduce the impact of residual water on the cooling effect of the water-cooled roller, and improve the cooling efficiency.

[0040] Please see Figure 6 As shown, vertical rods 19 are fixed at both ends of the mounting plate 20. The ends of the vertical rods 19 extend through to the outside of the closed end of the movable housing 5, and a crossbeam 18 is fixed between the ends of the vertical rods 19 on both sides. Hydraulic cylinders 16 are fixed on the upper and lower sides of the housing, and the ends of the telescopic rods of the hydraulic cylinders 16 are fixedly connected to the crossbeam 18 through the fixing rods 17.

[0041] During operation, the relative sliding design of the movable housing 5 allows the transition processing unit to flexibly adjust its position according to actual production needs. Hydraulic cylinder 16 is connected to the crossbeam 18 via a fixed rod 17, and the vertical rod 19 is fixedly connected to the movable housing 5. This allows the vertical rod 19 to drive the movable housing 5, mounting plate 20, and exhaust fan 21 to move as a whole. A distance sensor, such as a laser distance sensor, can be installed on the movable housing 5 to monitor the distance between the open end of the movable housing 5 and the plastic sheet in real time, feeding the data back to the control system. The control system precisely adjusts the extension and retraction of hydraulic cylinder 16 to ensure that the movable housing 5 and the plastic sheet maintain the optimal distance range. This allows for appropriate adjustment of the distance between the open end of the movable housing 5 and the plastic sheet based on its thickness, ensuring the open end of the movable housing 5 fits snugly against the plastic sheet. This shortens the distance between the inclined opening of the air delivery cavity 25 and the plastic sheet, allowing air ejected from the inclined opening to quickly spray onto the surface of the plastic sheet, thus cleaning water stains and reducing the interference of the negative pressure inside the movable housing 5 on the jet airflow. Furthermore, an extension plate is fixed on the inner wall of the movable housing 5 and located on the inclined open side to prolong the contact time between the jet airflow and the plastic sheet, thereby further reducing the interference of the negative pressure inside the movable housing 5 on the jet airflow.

[0042] Please see Figure 8As shown, the side wall of the vertical rod 19 is provided with a groove 29, and the two ends of the partition plate 22 are respectively connected to the groove 29 on the side wall of the two vertical rods 19; the side of the partition plate 22 facing the mounting plate 20 is set in a dovetail shape; the two ends of the mounting plate 20 are respectively provided with mounting holes, and the end of the vertical rod 19 is inserted through the mounting hole.

[0043] During operation, when the baffle 22 is used to divert hot and humid air, the hot and humid air comes into contact with the baffle 22, and water droplets may condense on the surface of the baffle 22. If these water droplets are not dealt with in time, they may drip onto the exhaust fan 21, affecting the normal operation of the exhaust fan 21, or they may drip onto the surface of the plastic sheet, interfering with the cooling effect of the plastic sheet.

[0044] Therefore, the design of the partition 22 has been further optimized in this invention. In the upper movable housing 5, some water droplets on the partition may be dispersed or atomized by airflow. These smaller droplets have minimal impact on the exhaust fan 21, allowing it to operate normally. Subsequently, during the pause of material processing, the exhaust fan 21 can be activated independently, allowing air circulation inside the movable housing 5 to promote the evaporation of residual water and achieve automatic cleaning. For plastic sheets, even if dispersed or atomized water droplets fall onto the sheet surface, they can be removed simultaneously by subsequent reverse blowing. Furthermore, some water droplets may converge along the dovetail structure of the partition 22 towards the two vertical rods 19 and flow along the grooves 29 on the side walls of the vertical rods 19. They are then discharged through the gap between the mounting holes on the upper mounting plate 20 and the grooves 29 to the area below the upper exhaust fan 21, thus preventing water droplets from dripping directly onto the exhaust fan 21. Additionally, the distance between the two vertical rods 19 is greater than the width of the plastic sheet, preventing interference with the movement of the plastic sheet.

[0045] Inside the lower movable shell 5, water droplets are collected at the closed end of the bottom of the shell under the action of airflow, and can be centrally treated by the subsequent drainage device.

[0046] Please see Figures 7 to 11 As shown, the vertical rod 19 is a hollow tube, and a drainage block 30 is fixed at the bottom of the upper vertical rod 19.

[0047] During operation, two movable housings 5 ​​are symmetrically arranged on the upper and lower sides of the housing. Therefore, the vertical rods 19 on the upper and lower sides are vertically opposite each other. A triangular drainage block 30 is installed at the bottom of the upper vertical rod 19, with its top edge connected to a groove 29 on the outer wall of the vertical rod 19. This allows water droplets in the groove 29 on the side wall of the vertical rod 19 to be guided to the tip of the drainage block 30 and drip from the tip into the hollow cavity of the lower vertical rod 19 for water collection. Drain pipes are fixed to the bottom of the lower movable housing 5 and the bottom of the vertical rod 19. Solenoid valves are installed on the drain pipes. During operation, the solenoid valves are closed to prevent internal gas leakage. During pauses, the solenoid valves open, and water accumulated inside the lower vertical rod 19 and the inner cavity of the lower movable housing 5 is drained through the drain pipes. Simultaneously, the hollow tube structure of the vertical rod 19 provides a lightweight advantage, reducing the overall weight of the movable housing 5 and thus lowering the energy consumption when the hydraulic cylinder 3 16 drives the movable housing 5.

[0048] In addition, the end of the vertical rod 19 extends to the vicinity of the open end of the movable housing 5, so as to shorten the distance between the ends of the vertical rods 19 symmetrically arranged on the upper and lower sides, thereby shortening the distance that the water droplets gathered on the upper vertical rod 19 fall, thereby reducing the influence of the airflow inside the movable housing 5 on the water droplet dripping.

[0049] Please see Figure 3 As shown, limit plates 8 are symmetrically arranged on both sides of the aerosol box 1, and a hydraulic cylinder 7 for adjusting the position of the limit plates 8 is fixed on the outer wall of the aerosol box 1.

[0050] During operation, the limiting plate 8 is set inside the aerosol box 1. The hydraulic cylinder 7 drives the two limiting plates 8 to reciprocate, adjusting the distance between the two limiting plates 8 to limit the plastic sheet on the conveying assembly 6, so that the plastic sheet remains in a centered state during the conveying process and avoids deviation during the conveying process.

[0051] Please see Figure 3 As shown, a diversion plate 9 is provided on the top inner wall of the aerosol box 1. The diversion plate 9 is configured as a triangular cone. A water collection tank 10 is fixed on the inner wall of the end of the aerosol box 1 away from the water-cooled box 2. A drain pipe is provided on the side wall of the aerosol box 1.

[0052] During operation, a guide plate 9 is installed at the top of the mist chamber. Hot, humid air comes into contact with the surface of the guide plate 9, causing water droplets to condense. The bottom of the guide plate 9 is inclined, guiding the water droplets to a collection tank 10. The collection tank 10 collects the water droplets formed at the top, preventing them from dripping onto the surface of the plastic sheet and affecting its cooling effect. Simultaneously, the condensate collected in the collection tank 10 can be discharged through a drain pipe, achieving centralized treatment of condensate inside the mist chamber 1 and further reducing interference with the cooling process of the plastic sheet. Furthermore, water droplets generated on the side walls of the mist chamber 1 and freely falling water mist will fall to the bottom of the chamber and accumulate, then be periodically drained by a drainage device at the bottom, preventing excessive water accumulation inside the chamber from affecting the normal operation of the equipment.

[0053] Please see Figure 4-5 As shown, U-shaped connecting frames 12 are respectively provided on the upper and lower sides of the inner cavity of the water-cooled box 2. Hydraulic cylinders 11 for driving the connecting frames 12 are respectively fixed on the upper and lower outer walls of the water-cooled box 2. Connecting seats 13 are respectively provided at both ends of the water-cooling rollers 4 on the upper and lower sides. The connecting seats 13 are connected to the connecting frames 12 through connecting rods 14.

[0054] The lower connecting rod 14 is fixedly connected to the connecting seat 13 and the connecting frame 12 at both ends, respectively; one end of the upper connecting rod 14 is fixedly connected to the connecting seat 13, and the other end is slidably inserted into the sliding cavity opened at the end of the connecting frame 12, and a spring 15 is sleeved on the upper connecting rod 14.

[0055] During operation, the connecting frame 12 is moved by hydraulic cylinder 2 11, thereby adjusting the position of the water-cooled roller 4. Initially, the top of the lower water-cooled roller 4 is aligned with the top of the drive wheel in the conveying assembly 6 by the lower hydraulic cylinder 2 11, so that the plastic sheet can smoothly transition from the drive wheel to the upper water-cooled roller 4. Depending on the thickness of the plastic sheet, the position of the upper water-cooled roller 4 is adjusted by the upper hydraulic cylinder 2 11, so that the distance between the upper and lower water-cooled rollers 4 is slightly less than the sheet thickness, thereby applying a certain clamping force to the sheet under the action of spring 15. By setting the movable connecting rod 14 and spring 15, the upper water-cooled roller 4 can achieve adaptive fine-tuning in the vertical direction to compensate for minor fluctuations in sheet thickness or surface unevenness, thus maintaining stable contact between the water-cooled roller 4 and the sheet surface to ensure cooling effect. To ensure that the contact pressure between the water-cooled roller 4 and the plastic sheet is within a reasonable range, avoiding excessive pressure leading to sheet deformation or surface indentation, or insufficient pressure leading to poor heat conduction, those skilled in the art can reasonably select the parameters of spring 15 according to the actual application scenario.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A plastic plate gradient cooling device based on the combination of water cooling and aerosol cooling, characterized in that: include: The box body is integrally formed from an aerosol box (1) and a water-cooled box (2), and the aerosol box (1) and the water-cooled box (2) are arranged sequentially along the conveying direction of the plastic sheet. The aerosol assembly (3) is symmetrically arranged on the upper and lower sides inside the aerosol box (1) for spraying aerosol onto the plastic sheet to cool it. A water-cooling assembly is installed inside the water-cooling box (2). The water-cooling assembly includes water-cooling rollers (4) arranged vertically. The water-cooling rollers (4) are used to water-cool the plastic sheet. A conveying assembly (6) is used to convey plastic sheets from the aerosol box (1) to the water-cooled box (2). A transition processing unit is provided at the connection position between the aerosol box (1) and the water-cooled box (2). The transition processing unit includes a movable housing (5) and an exhaust fan (21) provided in the movable housing, which is used to discharge the gas in the aerosol box (1).

2. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 1, characterized in that: The movable housing (5) is open at one end facing the inside of the box and closed at the other end facing the outside of the box. An installation plate (20) is provided in the inner cavity of the movable housing (5), and multiple exhaust fans (21) are evenly distributed on the installation plate (20). An air collection hood (27) is fixed on the outside of the closed end of the movable housing (5), and an air supply pipe (28) is fixed on the air collection hood (27). An air hole (26) is provided on the closed end of the movable housing (5) to connect its inner cavity and the inner cavity of the air collection hood (27). An air inlet groove is provided on the side wall of the movable housing (5) facing the aerosol box (1).

3. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 2, characterized in that: A partition (22) is provided inside the movable housing (5) and between the closed end and the exhaust fan (21). The partition (22) divides the inner cavity of the movable housing (5) into a left chamber (23) adjacent to the aerosol box (1) and a right chamber (24) adjacent to the water cooling box (2). The air hole (26) is connected to the left chamber (23). An air supply cavity (25) is provided inside the side wall of the movable housing (5) facing the water cooling box (2). The side of the air supply cavity (25) near the closed end of the movable housing (5) is connected to the right chamber (24). The side of the air supply cavity (25) near the open end of the movable housing (5) is open and inclined towards the aerosol box (1).

4. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 3, characterized in that: The mounting plate (20) is fixed with vertical rods (19) at both ends. The ends of the vertical rods (19) extend through to the outside of the closed end of the movable housing (5), and a crossbeam (18) is fixed between the ends of the vertical rods (19) on both sides. Hydraulic cylinders (16) are fixed on the upper and lower sides of the housing respectively. The telescopic rod ends of the hydraulic cylinders (16) are fixedly connected to the crossbeam (18) through a fixing rod (17).

5. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 4, characterized in that: The vertical rod (19) has a groove (29) on its side wall, and the two ends of the partition (22) are respectively connected to the groove (29) on the side wall of the vertical rod (19) on both sides; the side of the partition (22) facing the mounting plate (20) is set in a dovetail shape; the two ends of the mounting plate (20) are respectively provided with mounting holes, and the end of the vertical rod (19) is inserted through the mounting hole.

6. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 5, characterized in that: The vertical rod (19) is a hollow tube, and a drainage block (30) is fixed at the bottom of the upper vertical rod (19).

7. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 1, characterized in that: Limiting plates (8) are symmetrically arranged on both sides of the aerosol box (1), and a hydraulic cylinder (7) for adjusting the position of the limiting plates (8) is fixed on the outer wall of the aerosol box (1).

8. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 1, characterized in that: A diversion plate (9) is provided on the top inner wall of the aerosol box (1). The diversion plate (9) is set in the shape of a triangular cone. A water collection tank (10) is fixed on the inner wall of the end of the aerosol box (1) away from the water-cooled box (2). A drain pipe is provided on the side wall of the aerosol box (1).

9. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 1, characterized in that: The upper and lower sides of the inner cavity of the water-cooled box (2) are respectively provided with U-shaped connecting frames (12), and the upper and lower outer walls of the water-cooled box (2) are respectively fixed with hydraulic cylinders (11) for driving the connecting frames (12) to move; the upper and lower sides of the water-cooled roller (4) are respectively provided with connecting seats (13), and the connecting seats (13) are connected to the connecting frames (12) through connecting rods (14).

10. The plastic plate gradient cooling device based on water cooling combined with air mist cooling according to claim 9, characterized in that: The lower connecting rod (14) is fixedly connected to the connecting seat (13) and the connecting frame (12) at both ends respectively; one end of the upper connecting rod (14) is fixedly connected to the connecting seat (13), and the other end is slidably inserted into the sliding cavity opened at the end of the connecting frame (12), and a spring (15) is sleeved on the upper connecting rod (14).

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