Radiation refrigeration coating preparation device

Abstract

The radiation refrigeration coating preparation device comprises an upper barrel, a lower barrel, a piston, a stirring frame and a driving shaft, the upper barrel is provided with a feeding pipe, a blanking pipe is coaxially arranged below a bottom plate of the upper barrel, and a plurality of discharging holes are formed in the circumference of the blanking pipe; the lower barrel is coaxially arranged at the bottom of the upper barrel, and a discharge pipe is arranged at the bottom of the lower barrel; the driving shaft coaxially penetrates through the bottom of the lower barrel, the upper end of the driving shaft extends to the middle position of the height of the lower barrel, the driving shaft is driven by a motor, the stirring frame comprises a mandrel, the lower end of the mandrel is arranged on the driving shaft in a sleeving mode, the mandrel and the driving shaft rotate together, a stirring paddle located in the lower barrel is arranged on the outer wall of the lower section of the mandrel, and a protruding plate is arranged on the outer wall of the upper section of the mandrel; an inverted cylinder is coaxially arranged outside the upper end of the mandrel, and paddles are arranged on the outer wall of the cylinder; the piston is coaxially arranged in the cylinder; the core shaft is movably arranged in the vertical direction relative to the driving shaft. According to the scheme, various raw materials of the radiation refrigeration coating can be fully mixed, the quality of the coating is ensured, and the mixing efficiency can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of radiation cooling coating mixing, and particularly relates to a device for preparing radiation cooling coatings. Background Art

[0002] Radiative cooling refers to a cooling method that directly releases heat to outer space through infrared radiation from the atmospheric window. The characteristic of radiative cooling is that the surface temperature of the cooling body (the infinitely deep outer space) is constantly lower than the surface temperature of the Earth's objects, and then the temperature of the radiative cooling body is reduced below the Earth's atmospheric temperature through conduction, so as to achieve the purpose of radiative cooling. Coating radiative cooling coatings on outdoor buildings or various chassis can effectively utilize radiative cooling technology to reduce the temperature of outdoor buildings and various chassis.

[0003] Radiative cooling coatings are usually made by mixing raw materials such as silica microspheres, fluorosilicone emulsions, deionized water, fillers, and various additives. Among them, multiple processes require mixing and stirring of the raw materials. The raw materials of radiative cooling coatings include liquids and various powders. If the powders and liquids are not fully mixed during the mixing process, it is easy to form unqualified products such as emulsions, suspensions, and lumps. In the prior art, in order to ensure the full mixing of the raw materials, only the stirring time can be extended, which results in low production efficiency. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the present invention provides a device for preparing radiative cooling coatings, which can fully mix various raw materials of radiative cooling coatings, ensure the quality of the coatings, and improve the mixing efficiency.

[0005] To achieve the purpose of the present invention, the following scheme is proposed: A device for preparing radiative cooling coatings, comprising: an upper barrel, a lower barrel, a piston, a stirring frame, and a driving shaft; The upper barrel is provided with a feeding pipe, and a blanking pipe is coaxially arranged below the bottom plate of the upper barrel, and a plurality of discharging holes are opened on its circumference; The lower barrel is coaxially arranged at the bottom of the upper barrel, and a discharging pipe is provided at the bottom of the lower barrel; The driving shaft coaxially penetrates through the bottom of the lower barrel, and the upper end of the driving shaft extends to the middle position of the height of the lower barrel. The driving shaft is driven by a motor. The stirring frame includes a core shaft sleeved on the driving shaft at the lower end and rotating with the driving shaft. Stirring paddles are arranged on the outer wall of the lower section of the core shaft inside the lower barrel. A convex plate is arranged on the outer wall of the upper section of the core shaft. The convex plate and the core shaft both pass through the blanking pipe. An inverted cylinder is coaxially arranged outside the upper end of the core shaft. The cylinder is located inside the upper barrel, and paddle blades are arranged on the outer wall of the cylinder. The piston is coaxially arranged inside the cylinder. The piston rod passes upward through the bottom plate of the cylinder and is connected to a telescopic device arranged at the top of the upper barrel. The mandrel is arranged to move vertically relative to the drive shaft. When the mandrel moves to the lowest position, there are gaps both between the stirring paddle at the bottom and the bottom plate of the lower barrel, and between the cylinder and the bottom surface of the upper barrel. When the mandrel moves to the highest position, there is a gap between the stirring paddle at the top and the bottom surface of the blanking pipe.

[0006] The beneficial effects of the present invention are as follows: 1. In this solution, the blades arranged in the upper barrel are used to preliminarily mix the raw materials, and the preliminarily mixed raw materials are dispersed during the process of being sent into the lower barrel. Finally, the dispersed raw materials are deeply mixed by the stirring paddles. The device continuously performs three mixing processes on the raw materials, which can effectively prevent the formation of poor phenomena such as emulsions, suspensions, and lumps due to insufficient mixing; 2. During the mixing process, the stirring frame continuously reciprocates in the up and down directions, which can further improve the mixing effect and effectively prevent the raw materials from sinking to the bottom. Description of the Drawings

[0007] The drawings described herein are only for illustrating the selected embodiments, not all possible implementation schemes, and are not intended to limit the scope of the present invention.

[0008] Figure 1 The external structure diagram of the present application is shown.

[0009] Figure 2 The structural schematic diagrams of the upper barrel, the stirring frame, the drive shaft, and the piston are shown.

[0010] Figure 3 The overall cross-sectional view of the present application when the stirring frame is in the lowest position is shown.

[0011] Figure 4 The overall cross-sectional view of the present application when the stirring frame is in the highest position is shown.

[0012] Reference numerals in the figures: upper barrel - 1, blanking pipe - 11, discharge hole - 111, retaining ring - 12, lower barrel - 2, discharge pipe - 21, piston - 3, stirring frame - 4, mandrel - 41, stirring paddle - 42, convex plate - 43, cylinder - 44, blade - 45, spherical ball - 46, drive shaft - 5, telescopic device - 6, baffle - 7. Detailed Embodiments

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will describe the embodiments of the present invention in detail with reference to the drawings. However, the embodiments described herein are only a part of the embodiments of the present invention, not all of the embodiments.

[0014] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0015] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description. The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. The terms "parallel", "perpendicular", etc. do not mean that the components are required to be absolutely parallel or perpendicular, but can be slightly inclined.

[0016] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0017] As Figures 1 to 4 shown, a device for preparing a radiative cooling coating includes: an upper barrel 1, a lower barrel 2, a piston 3, a stirring frame 4 and a driving shaft 5.

[0018] The upper barrel 1 is provided with a feeding pipe. Specifically, the feeding pipe is used to feed various liquid and powder raw materials for preparing the radiative cooling coating into the interior of the upper barrel 1. As a preferred structure, feeding pipes for respectively feeding liquid and powder can be provided at the top of the upper barrel 1. A blanking pipe 11 is coaxially provided below the bottom plate of the upper barrel 1, and a plurality of discharging holes 111 are formed in its circumference.

[0019] The lower barrel 2 is coaxially provided at the bottom of the upper barrel 1. Therefore, the blanking pipe 11 is naturally coaxially located at the upper end inside the lower barrel 2. A discharging pipe 21 is provided at the bottom of the lower barrel 2. As a solution, a valve is provided inside the discharging pipe 21 to control the opening and closing of the discharging pipe 21; preferably, the lower barrel 2 and the upper barrel 1 are connected by screws.

[0020] The driving shaft 5 coaxially penetrates through the bottom of the lower barrel 2, and the upper end of the driving shaft 5 extends to the middle position of the height of the lower barrel 2. The driving shaft 5 is driven by a motor.

[0021] As a preferred solution, the motor is fixed at the bottom of the lower barrel 2, and a gear transmission or a chain transmission is adopted between the motor and the driving shaft 5.

[0022] The stirring frame 4 includes a mandrel 41 with its lower end sleeved on the drive shaft 5 and rotating together with the drive shaft 5. The outer wall of the lower section of the mandrel 41 is provided with stirring paddles 42 located inside the lower barrel 2. The outer wall of the upper section of the mandrel 41 is parallelly provided with convex plates 43. Both the convex plates 43 and the mandrel 41 pass through the blanking pipe 11. There is a gap between the edge of the convex plate 43 and the inner wall of the blanking pipe 11 to prevent collision between parts. Since the convex plate 43 is provided on the outer wall of the upper section of the mandrel 41, the gap between the outer wall of the upper section of the mandrel 41 and the inner wall of the blanking pipe 11 must be greater than the gap between the convex plate 43 and the inner wall of the blanking pipe 11. Preferably, a plurality of convex plates 43 are arranged in a circumferential array to improve the dispersion efficiency and effect of the raw materials.

[0023] A reversed cylinder 44 is coaxially provided outside the upper end of the mandrel 41. By the reversed cylinder 44, it means that the cylinder 44 is in a state with the bottom plate facing up and the opening facing down. The cylinder 44 is located inside the upper barrel 1. The inner diameter of the cylinder 44 is at least twice larger than the outer diameter of the upper section of the mandrel 41. For example, if the outer diameter of the upper section of the mandrel 41 is 5 cm, then the inner diameter of the cylinder 44 is larger than 10 cm. Specifically, the inner diameter of the cylinder 44 can be designed to be 12 cm, 15 cm or even 20 cm. The mandrel 41 and the cylinder 44 are connected by rib strips. The outer wall of the cylinder 44 is provided with blades 45. Through holes are opened on the blades 45 to improve the mixing effect of the raw materials.

[0024] The piston 3 is coaxially arranged inside the cylinder 44. The piston rod passes upward through the bottom plate of the cylinder 44 and is connected to a telescopic device 6 provided at the top of the upper barrel 1. The piston 3 can be driven to move vertically upward through the telescopic device 6. Specifically, the piston rod of the piston 3 is coaxially connected to the telescopic rod of the telescopic device 6. The telescopic device 6 is an air cylinder, a hydraulic cylinder or a telescopic motor.

[0025] The mandrel 41 is arranged to move vertically relative to the drive shaft 5. When the mandrel 41 moves to the lowest position, there are gaps both between the bottom stirring paddle 42 and the bottom plate of the lower barrel 2 and between the cylinder 44 and the bottom surface of the upper barrel 1 to prevent collision and friction between parts and reduce the influence on the running speed and stability of the stirring frame 4. As a preferred structure, the gap between the stirring paddle 42 and the bottom plate of the lower barrel 2 is less than or equal to 5 mm to facilitate stirring the raw materials at the bottom of the lower barrel 2 as much as possible and prevent the raw materials from sinking to the bottom; the gap between the cylinder 44 and the bottom plate of the upper barrel 1 is less than or equal to 2 mm to prevent too much raw material in the upper barrel 1 from flowing into the blanking pipe 11 through the gap between the cylinder 44 and the bottom plate of the upper barrel 1 during the process of stirring the raw materials inside the upper barrel 1 by the blades 45; when the mandrel 41 moves to the highest position, there is a gap between the top stirring paddle 42 and the bottom surface of the blanking pipe 11 to prevent collision and friction between parts. After the mandrel 41 moves upward, the gap between the cylinder 44 and the bottom plate of the upper barrel 1 will increase. At this time, the raw materials preliminarily mixed inside the upper barrel 1 can automatically flow into the blanking pipe 11.

[0026] As a preferred solution, a plurality of stirring paddles 42 and blades 45 are arranged in a circumferential array, and at least one layer is arranged along the axis of the core shaft 41.

[0027] Combined with Figure 3 、 Figure 4 shown in the figure, the working principle of the above solution is as follows: The first step: As shown in Figure 3 the figure, move the stirring frame 4 downward to the lowest position. Specifically, the self-weight of the stirring frame 4 can be utilized to make it automatically descend, or the telescopic device 6 can be used to drive the piston 3 downward, and the piston 3 is used to push the core shaft 41 downward, thereby moving the stirring frame 4 downward. The limit of the stirring frame 4 moving to the lower limit position can be achieved by using the positional relationship between the drive shaft 5 and the core shaft 41. The lower end of the core shaft 41 is sleeved on the drive shaft 5. Therefore, an installation hole for passing through the drive shaft 5 must be opened at the bottom of the core shaft 41. By using the method of the top surface of the drive shaft 5 abutting against the bottom surface of the installation hole, the limit position of the core shaft 41 descending can be defined, so as to define the lowest height of the stirring frame 4 descending.

[0028] The second step: Preliminary mixing. Add various powder and liquid raw materials into the upper barrel 1 through the feeding pipe, and drive the stirring frame 4 to rotate through the drive shaft 5 during the adding process. When the stirring frame 4 rotates, it will drive the cylinder 44 to rotate through the core shaft 41, thereby preliminarily mixing the raw materials inside the upper barrel 1 by using the blades 45. The third step: Dispersing. After the raw materials are preliminarily mixed or during the preliminary mixing process, the telescopic device 6 is used to drive the piston 3 upward, and the contact between the piston 3 and the bottom plate of the cylinder 44 is used to drive the stirring frame 4 to move upward together, thereby increasing the gap between the cylinder 44 and the bottom plate of the upper barrel 1, so that the preliminarily mixed raw materials flow into the blanking pipe 11. During the process of the raw materials flowing into the blanking pipe 11, the stirring frame 4 is still rotating continuously, so as to continuously impact the raw materials entering the blanking pipe 11 by using the convex plate 43, so as to achieve the purpose of dispersing the preliminarily mixed raw materials. Under the impact of the convex plate 43, the raw materials are quickly pushed into the discharge hole 111, and then automatically fall into the lower barrel 2 through the discharge hole 111. Step 4: Deep mixing. Use the telescopic device 6 to drive the piston 3 to reciprocate vertically. When descending, affected by gravity, the stirring frame 4 will move to the lowest point first, minimizing the gap between the cylinder 44 and the bottom plate of the upper barrel 1, thereby using the cylinder 44 to separate the upper barrel 1 from the blanking pipe 11 again. As a preferred solution, raw materials can be added into the upper barrel 1 at this stage to achieve the purpose of preliminary mixing of the raw materials in the upper barrel 1; then the piston 3 will continue to descend relative to the cylinder 44. During the process of the piston 3 descending in the cylinder 44, the raw materials that have been preliminarily mixed inside the cylinder 44 can be quickly pushed into the blanking pipe 11 for dispersion. After the dispersed raw materials fall into the lower barrel 2, they will be stirred and mixed again under the action of the stirring paddle 42; under the action of the reciprocating piston 3, the stirring frame 4 will also move up and down continuously, driving the rotating stirring paddle 42 to move up and down continuously in the lower barrel 2, thereby preventing the raw materials from settling to the bottom and effectively improving the mixing effect and mixing efficiency, so as to achieve the purpose of deep mixing. The continuous up and down movement of the stirring frame 4 also makes the blades 45 move up and down continuously in the upper barrel 1, thereby improving the effect and efficiency of preliminary mixing, and at the same time achieving the purpose of continuously and batch-discharging the preliminarily mixed raw materials in the upper barrel 1, avoiding the concentration or waiting during the discharging process of the preliminarily mixed raw materials.

[0029] Preferably, the outer diameter of the upper section of the core shaft 41 is smaller than that of the lower section, and the outer diameter of the lower section of the core shaft 41 matches the inner diameter of the blanking pipe 11. When the stirring frame 4 moves to the highest point, the top of the lower section of the core shaft 41 rotates through the blanking pipe 11, so that the top surface of the lower section of the core shaft 41 can cover the opening at the bottom of the blanking pipe 11, preventing the preliminarily mixed raw materials from directly discharging from the lower opening of the blanking pipe 11 and increasing the residence time of the raw materials in the blanking pipe 11 to ensure the dispersion effect of the raw materials.

[0030] Preferably, as Figure 3 , Figure 4 shown, a baffle 7 is coaxially and rotatably arranged inside the lower end of the blanking pipe 11. The baffle 7 is provided with a through hole for passing through the upper section of the core shaft 41 and a groove communicating with the through hole for passing through the convex plate 43. In this way, the baffle 7 can be used to block the bottom opening of the blanking pipe 11, preventing the raw materials in the blanking pipe 11 from discharging from the bottom opening of the blanking pipe 11 during the rising process of the core shaft 41; as a preferred structure, the baffle 7 is a disc structure, and a retaining ring 12 is installed at the lower end of the blanking pipe 11 by screws for rotatably installing the baffle 7 below the blanking pipe 11.

[0031] Preferably, a rotary sealing ring is provided on the outside of the piston 3. It can not only effectively seal the gap between the piston 3 and the cylinder 44, but also meet the requirement of the relative rotation of the cylinder 44 with respect to the piston 3. In this solution, the piston 3 can not only be used to drive the stirring frame 4 to move up and down and quickly push down the raw materials in the cylinder 44, but also improve the running stability of the stirring frame 4. The lower end of the stirring frame 4 is connected to the drive shaft 5 through a core shaft 41, and the connection between the core shaft 41 and the drive shaft 5 is a hole-shaft connection structure. Moreover, the core shaft 41 needs to move along the axis direction relative to the drive shaft 5. Therefore, there must be a gap in the hole-shaft fit between the core shaft 41 and the drive shaft 5. Affected by the gap, when the stirring frame 4 rotates, a large circumferential swing will occur at its upper end, thereby reducing the smoothness of the rotation of the stirring frame 4. And after the stirring frame 4 rises, the swing amplitude will further increase. By setting the piston 3 in this solution, installation structures are provided at both ends of the stirring frame 4, so that the swing amplitude of the upper end of the stirring frame 4 can be effectively reduced, the smoothness of the operation of the stirring frame 4 can be improved, and at the same time, the problem of driving the lifting of the stirring frame 4 is solved.

[0032] Preferably, as Figure 3 shown, a rolling ball 46 is embedded at the top of the core shaft 41, and the ball 46 is used to abut against the bottom surface of the piston 3 to reduce the friction between the piston 3 and the core shaft 41 when pressing down the stirring frame 4.

[0033] Preferably, the top surface of the stirring paddle 42 is inclined upward in the rotation direction of the core shaft 41, so as to facilitate the use of the stirring paddle 42 to throw up the raw materials at the bottom of the lower barrel 2 during stirring, thereby preventing the raw materials from sinking to the bottom and helping to improve the mixing effect; on the other hand, because in this solution, the stirring frame 4 is arranged to move in the vertical direction, during the downward movement of the piston 3, usually the stirring frame 4 will follow the piston 3 and descend under the action of gravity. In this embodiment, by setting the top surface of the stirring paddle 42 to be inclined upward in the rotation direction of the core shaft 41, while throwing up the raw materials by the stirring paddle 42, a downward pressure will be generated on the stirring frame 4, further ensuring the downward movement of the stirring frame 4, thereby preventing the stirring frame 4 from not descending or descending at a speed lower than the descending speed of the piston 3; and under the action of the downward pressure, the stirring frame 4 can reduce the requirement for the downward pressure of the piston 3, and even the stirring frame 4 can descend to the lowest position without the piston 3 abutting against the top surface of the core shaft 41. Thus, the friction between the piston 3 and the top surface of the core shaft 41 can be effectively reduced or even avoided.

[0034] Preferably, the upper section of the drive shaft 5 is a spline shaft structure. A counterbore is provided at the bottom of the core shaft 41. A sealing ring is provided on the inner wall of the lower section of the counterbore. The lower section of the counterbore matches the outer wall of the lower section of the drive shaft 5. The upper section of the counterbore has a spline hole matching the spline shaft. When the stirring frame 4 moves to the highest position, the spline shaft matches the spline hole, and the lower section of the counterbore matches the lower section of the drive shaft 5, so as to prevent raw materials from entering the spline hole.

[0035] Preferably, in combination Figures 2 to 4 As shown, the upper barrel 1 is provided with a detachable top cover, the telescopic device 6 is arranged on the top of the top cover, the cylinder 44 is detachably arranged on the mandrel 41, the bottom plate of the cylinder 44 is connected to the main body of the cylinder 44 by screws. During installation, first insert the mandrel 41 on the drive shaft 5, then install the upper barrel 1 so that the upper end of the mandrel 41 passes through the blanking pipe 11, then connect the main body of the cylinder 44 to the mandrel 41, insert the piston 3 into the cylinder 44, and install the bottom plate of the cylinder 44. Subsequently, install the top cover on the top of the upper barrel 1 and pass the piston rod through the top cover. Finally, connect the piston rod to the telescopic rod of the telescopic device 6 and fix the telescopic device 6 on the top cover.

[0036] The above are only the preferred embodiments of the present invention and do not represent that they are the only ones or limit the present invention. Those skilled in the art should understand that without departing from the scope of the present invention, various changes or equivalent replacements made to the present invention all fall within the scope of protection of the present invention.

Claims

1. A preparation device for a radiative cooling coating, characterized in that, Including: an upper barrel (1), a lower barrel (2), a piston (3), a stirring frame (4) and a drive shaft (5); The upper barrel (1) is provided with a feeding pipe. A blanking pipe (11) is coaxially arranged below the bottom plate of the upper barrel (1), and a plurality of discharging holes (111) are formed in its circumference; The lower barrel (2) is coaxially arranged at the bottom of the upper barrel (1), and a discharging pipe (21) is provided at the bottom of the lower barrel (2); The drive shaft (5) coaxially penetrates through the bottom of the lower barrel (2), and the upper end of the drive shaft (5) extends to the middle position of the height of the lower barrel (2). The drive shaft (5) is driven by a motor. The stirring frame (4) includes a core shaft (41) sleeved at the lower end on the drive shaft (5) and rotating together with the drive shaft (5). Stirring paddles (42) located inside the lower barrel (2) are arranged on the outer wall of the lower section of the core shaft (41). A convex plate (43) is arranged on the outer wall of the upper section of the core shaft (41). Both the convex plate (43) and the core shaft (41) pass through the blanking pipe (11). A cylinder (44) is coaxially arranged outside the upper end of the core shaft (41). The cylinder (44) is located inside the upper barrel (1), and paddle blades (45) are arranged on the outer wall of the cylinder (44); The piston (3) is coaxially arranged inside the cylinder (44). The piston rod passes upward through the bottom plate of the cylinder (44) and is connected to a telescopic device (6) arranged at the top of the upper barrel (1); The core shaft (41) is arranged to move vertically relative to the drive shaft (5). When the core shaft (41) moves to the lowest position, there are gaps both between the bottom stirring paddle (42) and the bottom plate of the lower barrel (2) and between the cylinder (44) and the bottom surface of the upper barrel (1). When the core shaft (41) moves to the highest position, there is a gap between the top stirring paddle (42) and the bottom surface of the blanking pipe (11).

2. The preparation device of a radiation cooling coating according to claim 1, wherein The outer diameter of the upper section of the core shaft (41) is smaller than that of the lower section, and the outer diameter of the lower section of the core shaft (41) matches the inner diameter of the blanking pipe (11). When the stirring frame (4) moves to the highest point, the top of the lower section of the core shaft (41) rotatably penetrates into the blanking pipe (11).

3. The preparation device of a radiative cooling coating according to claim 1, wherein A baffle (7) is coaxially and rotatably arranged inside the lower end of the blanking pipe (11). The baffle (7) is provided with a through hole for penetrating the upper section of the core shaft (41) and a groove communicating with the through hole for penetrating the convex plate (43).

4. A radiation cooling coating preparation device according to claim 1 or 4, characterized in that, A plurality of convex plates (43) are arranged in a circumferential array.

5. The preparation device of a radiative cooling coating according to claim 1, characterized in that, A rotary sealing ring is arranged outside the piston (3).

6. The preparation device of a radiative cooling coating according to claim 1, characterized in that, A rolling ball (46) is embedded and arranged at the top of the core shaft (41), and the rolling ball (46) is used to abut against the bottom surface of the piston (3).

7. The preparation device of a radiative cooling coating according to claim 1, characterized in that The top surface of the stirring paddle (42) is inclined upward towards the rotation direction of the core shaft (41).

8. A device for preparing a radiative cooling coating according to claim 1, characterized in that, The upper section of the drive shaft (5) is of a spline shaft structure. A counterbore is formed at the bottom of the core shaft (41). A sealing ring is arranged on the inner wall of the lower section of the counterbore. The lower section of the counterbore matches the outer wall of the lower section of the drive shaft (5). The upper section of the counterbore has a spline hole matching the spline shaft. When the stirring frame (4) moves to the highest position, the spline shaft matches the spline hole, and the lower section of the counterbore matches the lower section of the drive shaft (5).

9. The preparation device of a radiative cooling coating according to claim 1, characterized in that, The upper barrel (1) is provided with a detachable top cover. The telescopic device (6) is arranged at the top of the top cover. The cylinder (44) is detachably arranged on the core shaft (41), and the bottom plate of the cylinder (44) is connected to the main body of the cylinder (44) by screws.

10. A device for preparing a radiative cooling coating according to claim 1, characterized in that, The blade (45) is provided with a through hole.

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