Low temperature melt extrusion device for production of photocurable powder

Abstract

The utility model is suitable for light solidification powder technical field provides a kind of low-temperature melting extrusion device for light solidification powder production, including melting component, stirring subassembly, extrusion component and multiple cooling components being set along extrusion component, the melting component includes melting bin, partitioning material board and discharge pipe, the extrusion component includes extrusion cylinder and extrusion shaft being set along extrusion cylinder, the cooling component includes cooling sleeve being set symmetrically about extrusion cylinder, cooling fan being set in cooling sleeve bottom and air outlet bin being opened in cooling sleeve inside.This device solves the problem that light solidification powder cannot be directly crushed, solidified and processed after extrusion process with high temperature after melting and mixing, achieves uniform cooling of light solidification powder during extrusion process after melting and mixing, ensures that light solidification powder temperature after extrusion can be directly crushed and solidified, and improves the production efficiency of light solidification powder coating.

Description

Technical Field

[0001] This utility model relates to the field of photocurable powder technology, and more specifically, it relates to a low-temperature melt extrusion device for the production of photocurable powder. Background Technology

[0002] UV-curable powder coatings are a new type of coating that is cured by free radical or cationic polymerization initiated by ultraviolet light (UV). The process is divided into two stages: melt leveling and UV curing.

[0003] The production process of UV-curable powder coatings is similar to that of other powder coatings, including steps such as ingredient formulation, premixing, extrusion, cooling, pulverizing, screening, and packaging. However, because UV-curable powder coatings often contain amorphous unsaturated polyesters, which have lower glass transition temperatures and resin melting points, and higher resin content, it is more suitable to maintain a stable temperature of 60-70°C in the mixing section during extrusion. If the formulation contains crystalline and semi-crystalline resins (such as curing agents), a mixing section temperature exceeding 70°C may result in excessively viscous discharge, making tableting impossible. This is because the crystalline and semi-crystalline resins will melt into a liquid, and by the time the resin cools to recrystallize, the amorphous resin has already cooled, preventing the material from passing through the infrared tablet press.

[0004] Therefore, it is necessary to propose a method that can maintain low temperature during the melt mixing and extrusion stages, so as to ensure that the extruded photocurable powder coating can be directly processed in the subsequent crushing, curing and other processes at low temperature, thereby effectively improving the production efficiency of photocurable powder coating. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a low-temperature melt extrusion device for producing photocurable powders, which uniformly cools the photocurable powder during the extrusion process after melt mixing, ensuring that the temperature of the extruded photocurable powder is sufficient for subsequent crushing and curing, thereby improving the production efficiency of photocurable powder coatings.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A low-temperature melt extrusion apparatus for producing photocurable powder includes a melting component, a stirring component disposed inside the melting component, an extrusion component disposed at the bottom of the melting component, and a plurality of cooling components disposed along the extrusion component. The melting component includes a melting chamber, a separating plate disposed at the bottom of the melting chamber, and a discharge pipe. The extrusion component includes a mounting base, an extrusion cylinder mounted on the mounting base, and an extrusion shaft disposed along the extrusion cylinder. The cooling components include cooling sleeves symmetrically disposed about the extrusion cylinder, a cooling fan disposed at the bottom of the cooling sleeve, and an air outlet chamber opened inside the cooling sleeve.

[0008] The present invention is further configured such that: a feed inlet is provided on one side of the melting chamber, multiple support frames are arranged around the side wall of the melting chamber, and a guide plate is spirally arranged around the inner wall of the melting chamber.

[0009] The present invention is further configured such that: a discharge port is provided at the bottom of the melting chamber, a discharge pipe is connected to the bottom of the melting chamber, and the separating plate is movably disposed between the discharge port and the discharge pipe.

[0010] The present invention is further configured such that: the stirring assembly includes a mounting frame installed on the top of the melting chamber, a stirring motor installed on the top of the mounting frame, and a stirring shaft disposed inside the melting chamber; the output shaft of the stirring motor is connected to the stirring shaft; and multiple stirring blades are arranged around the side wall of the stirring shaft.

[0011] The present invention is further configured such that: the mounting base is located at the bottom of the melting chamber, an extrusion motor is mounted on one side of the mounting base, the output end of the extrusion motor is connected to a transmission box, and one side of the extrusion cylinder is connected to the discharge pipe.

[0012] The present invention is further configured such that: one end of the extrusion shaft is connected to the transmission box, and an extrusion plate is arranged around the side wall of the extrusion shaft, and the extrusion plate is spirally arranged along the length direction of the extrusion shaft.

[0013] The present invention is further configured such that: a cooling cavity is provided between the air outlet of the cooling fan and the cooling sleeve, and the air outlet chamber between the two cooling sleeves is arranged around the side wall of the extrusion cylinder.

[0014] The present invention is further configured such that: the cooling cavity is connected to the air outlet chamber, and a convection hole is provided between the two cooling sleeves, the convection hole being located at the top of the extrusion cylinder.

[0015] The beneficial effects of this utility model are:

[0016] Cooling air generated by a cooling fan installed along the extrusion cylinder circulates within the air outlet chamber, cooling the outer wall of the extrusion cylinder. Ultimately, the heat conduction through the outer wall of the extrusion cylinder cools the raw material extruded inside. This ensures that the temperature of the extruded photocurable powder is sufficient for subsequent pulverization and curing processes, improving the production efficiency of photocurable powder coatings. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the low-temperature melt extrusion device for producing photocurable powder according to this utility model.

[0019] Figure 2 for Figure 1The front view shown.

[0020] Figure 3 for Figure 1 The top view shown.

[0021] Figure 4 For along Figure 2 A cross-sectional view showing section line AA.

[0022] Figure 5 For along Figure 3 The sectional view showing the BB section line.

[0023] Figure 6 for Figure 1 The diagram shows the structure of the extrusion assembly and the cooling assembly.

[0024] Explanation of reference numerals in the attached drawings: 1. Melting assembly; 11. Melting chamber; 12. Support frame; 13. Feed inlet; 14. Guide plate; 15. Discharge pipe; 16. Discharge outlet; 17. Dividing plate;

[0025] 2. Mixing assembly; 21. Mixing motor; 22. Mounting bracket; 23. Mixing shaft; 24. Mixing blades;

[0026] 3. Extrusion assembly; 31. Mounting base; 32. Extrusion motor; 33. Transmission box; 34. Extrusion shaft; 35. Extrusion plate; 36. Extrusion barrel;

[0027] 4. Cooling components; 41. Cooling sleeve; 42. Cooling cavity; 43. Cooling fan; 44. Air outlet chamber; 45. Convection hole. Detailed Implementation

[0028] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the present utility model, and therefore only shows the components relevant to the present utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Please refer to Figure 1A low-temperature melt extrusion apparatus for producing photocurable powder includes a melting component 1, a stirring component 2 disposed inside the melting component 1, an extrusion component 3 disposed at the bottom of the melting component 1, and multiple cooling components 4 disposed along the extrusion component 3. During processing, unsaturated polyester resin, a photoinitiator (such as a benzophenone derivative), and a leveling agent (polyacrylate) are first added to the melting component 1 in a specific ratio. After heating, the mixture is stirred by the stirring component 2 for melt mixing. After melt mixing, the mixture is extruded through the extrusion component 3, ensuring uniform dispersion of each component. During extrusion, the cooling components 4 lower the temperature to ensure that the temperature of the extruded photocurable powder is suitable for subsequent pulverization and curing processes.

[0030] Please refer to Figure 1-5 The melting assembly 1 includes a melting chamber 11, a separating material plate 17 located at the bottom of the melting chamber 11, and a discharge pipe 15. The melting chamber 11 is a hollow cylindrical structure with a conical bottom. Multiple support frames 12 are arranged around the side wall of the melting chamber 11 to ensure stable support. A feed inlet 13 is provided on one side of the melting chamber 11, which is connected to the interior of the melting chamber 11. The raw materials required for producing photocurable powder can be added into the melting chamber 11 through the feed inlet 13. An electric heating wire can be installed on the outer wall of the melting chamber 11 for heating, which facilitates the melting and mixing of the raw materials after heating. A guide plate 14 is spirally arranged around the inner wall of the melting chamber 11. The guide plate 14 is connected to the inner wall of the melting chamber 11. After the raw materials enter the melting chamber 11, they can gradually move downwards along the spiral direction of the guide plate 14, improving the uniformity of the raw materials during the mixing process. A discharge port 16 is provided at the bottom of the melting chamber 11, and a discharge pipe 15 is connected to the bottom of the melting chamber 11. A separating plate 17 is movably disposed between the discharge port 16 and the discharge pipe 15. During melt mixing, the separating plate 17 is pushed inward to separate the discharge port 16 from the discharge pipe 15, ensuring that melt mixing can proceed fully. After melt mixing is completed, the separating plate 17 is pulled outward to connect the discharge port 16 with the discharge pipe 15, facilitating the discharge of the molten photocurable powder raw material through the discharge port 16 and the discharge pipe 15 for the next extrusion step.

[0031] Please refer to Figure 1-5The stirring assembly 2 includes a mounting frame 22 installed on top of the melting chamber 11, a stirring motor 21 installed on top of the mounting frame 22, and a stirring shaft 23 disposed inside the melting chamber 11. The mounting frame 22 is fixedly connected to the top of the melting chamber 11 and is hollow in the middle. The output shaft of the stirring motor 21 passes through the mounting frame 22. The output shaft of the stirring motor 21 is connected to the stirring shaft 23, which is arranged along the centerline of the melting chamber 11. The stirring motor 21 can drive the stirring shaft 23 to rotate. Multiple stirring blades 24 are arranged around the side wall of the stirring shaft 23. The stirring blades 24 are horizontally arranged and arranged along the length of the stirring shaft 23. During the rotation of the stirring shaft 23, the stirring blades 24 can rotate synchronously with the stirring shaft 23. Through the rotation of the stirring shaft 23 and the stirring blades 24, the mixing of raw materials inside the melting chamber 11 can be further accelerated, ensuring that the raw materials are mixed evenly and fully during the melting and mixing process.

[0032] Please refer to Figure 1-6 The extrusion assembly 3 includes a mounting base 31, an extrusion cylinder 36 mounted on the mounting base 31, and an extrusion shaft 34 arranged along the extrusion cylinder 36. The mounting base 31 is located at the bottom of the melting chamber 11 and is horizontally positioned. Both ends of the extrusion cylinder 36 are mounted on the mounting base 31. One side of the extrusion cylinder 36 is connected to the discharge pipe 15, allowing the raw material after melting and mixing to enter the interior of the extrusion cylinder 36 through the discharge pipe 15. An extrusion motor 32 is mounted on one side of the mounting base 31. The output end of the extrusion motor 32 is connected to a transmission box 33, and one end of the extrusion shaft 34 is connected to the transmission box 33. Specifically, the transmission box 33 has an output end and an input end at both ends. The input end of the transmission box 33 is connected to the output shaft of the extrusion motor 32, and the output end of the transmission box 33 is connected to the extrusion shaft 34. Through the transmission of the transmission box 33, the extrusion motor 32 can drive the extrusion shaft 34 to rotate. An extrusion plate 35 is arranged around the side wall of the extrusion shaft 34, and the extrusion plate 35 is spirally arranged along the length of the extrusion shaft 34. During the rotation of the extrusion shaft 34, the extrusion plate 35 can rotate synchronously. During the rotation of the extrusion plate 35, the raw material inside the extrusion cylinder 36 can be gradually extruded, which facilitates subsequent crushing, solidification and other operations.

[0033] Please refer to Figure 1-6The cooling assembly 4 includes cooling sleeves 41 symmetrically arranged about the extrusion cylinder 36, a cooling fan 43 disposed at the bottom of the cooling sleeves 41, and an air outlet chamber 44 formed inside the cooling sleeves 41. The cooling sleeves 41 are equidistantly arranged along the extrusion cylinder 36 and are connected by bolts. When the cooling sleeves 41 surround the extrusion cylinder 36, the air outlet chamber 44 between the two cooling sleeves 41 surrounds the side wall of the extrusion cylinder 36, thus forming an annular cavity on the side wall of the extrusion cylinder 36. The cooling fan 43 is fixedly installed at the bottom of the cooling sleeves 41. A cooling cavity 42 is provided between the air outlet of the cooling fan 43 and the cooling sleeves 41. The cooling cavity 42 communicates with the air outlet chamber 44. The cold air generated by the cooling fan 43 can diffuse through the cooling cavity 42 into the air outlet chamber 44, circulate inside the air outlet chamber 44, thereby cooling the outer wall of the extrusion cylinder 36, and ultimately cooling the raw material extruded inside the extrusion cylinder 36 through heat conduction from the outer wall of the extrusion cylinder 36. A convection hole 45 is provided between the two cooling sleeves 41, and the convection hole 45 is located at the top of the extrusion cylinder 36. The convection hole 45 is connected to the air outlet chamber 44. After the cold air completes its circulation in the cavity formed by the air outlet chamber 44, it is discharged upward through the convection hole 45, thus carrying away the heat in time.

[0034] Before melt mixing, the separator plate 17 is pushed inward to separate the outlet 16 from the outlet pipe 15, ensuring sufficient melt mixing. Then, the raw materials required for producing the UV-curable powder are added into the melting chamber 11 through the inlet 13. The raw materials are heated and melt-mixed inside the melting chamber 11. During the melt mixing process, the rotation of the stirring shaft 23 and stirring blades 24 further accelerates the mixing of the raw materials inside the melting chamber 11, ensuring uniform and thorough mixing. After melt mixing is complete, the separator plate 17 is pulled outward to connect the outlet 16 with the outlet pipe 15, facilitating the discharge of the molten UV-curable powder raw materials through both the outlet 16 and the outlet pipe 15.

[0035] After being melted and mixed, the raw material continues to enter the extrusion cylinder 36 through the discharge pipe 15. The extrusion motor 32 drives the extrusion shaft 34 to rotate through the transmission box 33. During the synchronous rotation of the extrusion plate 35, the raw material inside the extrusion cylinder 36 is gradually extruded, facilitating subsequent crushing, solidification, and other operations. During the raw material extrusion process, the cold air generated by the cooling fan 43 diffuses into the air outlet chamber 44 through the cooling cavity 42, circulates within the air outlet chamber 44, thereby cooling the outer wall of the extrusion cylinder 36. Finally, through heat conduction from the outer wall of the extrusion cylinder 36, the extruded raw material inside the extrusion cylinder 36 is cooled. After completing the circulation within the cavity formed by the air outlet chamber 44, the cold air is discharged upward through the convection holes 45, promptly carrying away the heat.

[0036] Cool air generated by the cooling fan 43 installed along the extrusion cylinder 36 circulates in the air outlet chamber 44, cooling the outer wall of the extrusion cylinder 36. Ultimately, the raw material extruded inside the extrusion cylinder 36 is cooled through heat conduction from the outer wall of the extrusion cylinder 36. This ensures that the temperature of the extruded photocurable powder is high enough for subsequent crushing and curing processes, improving the production efficiency of photocurable powder coatings.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 utility model and simplifying the description, and are not intended to 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 utility model.

[0039] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-temperature melt extrusion apparatus for producing photocurable powder, characterized in that: The assembly includes a melting component (1), a stirring component (2) disposed inside the melting component (1), an extrusion component (3) disposed at the bottom of the melting component (1), and a plurality of cooling components (4) disposed along the extrusion component (3). The melting component (1) includes a melting chamber (11), a separating material plate (17) disposed at the bottom of the melting chamber (11), and a discharge pipe (15). The extrusion component (3) includes a mounting base (31), an extrusion cylinder (36) mounted on the mounting base (31), and an extrusion shaft (34) disposed along the extrusion cylinder (36). The cooling components (4) include a cooling sleeve (41) symmetrically disposed about the extrusion cylinder (36), a cooling fan (43) disposed at the bottom of the cooling sleeve (41), and an air outlet chamber (44) opened inside the cooling sleeve (41).

2. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 1, characterized in that: The melting chamber (11) has a feed inlet (13) on one side, and multiple support frames (12) are arranged around the side wall of the melting chamber (11). A guide plate (14) is spirally arranged around the inner wall of the melting chamber (11).

3. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 2, characterized in that: The bottom of the melting chamber (11) is provided with a discharge port (16), and the bottom of the melting chamber (11) is connected to a discharge pipe (15). The separating plate (17) is movably arranged between the discharge port (16) and the discharge pipe (15).

4. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 1, characterized in that: The stirring assembly (2) includes a mounting frame (22) installed on the top of the melting chamber (11), a stirring motor (21) installed on the top of the mounting frame (22), and a stirring shaft (23) disposed inside the melting chamber (11). The output shaft of the stirring motor (21) is connected to the stirring shaft (23), and multiple stirring blades (24) are arranged around the side wall of the stirring shaft (23).

5. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 1, characterized in that: The mounting base (31) is located at the bottom of the melting chamber (11). An extrusion motor (32) is installed on one side of the mounting base (31). The output end of the extrusion motor (32) is connected to a transmission box (33). One side of the extrusion cylinder (36) is connected to the discharge pipe (15).

6. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 5, characterized in that: One end of the extrusion shaft (34) is connected to the transmission box (33), and an extrusion plate (35) is arranged around the side wall of the extrusion shaft (34). The extrusion plate (35) is spirally arranged along the length of the extrusion shaft (34).

7. The low-temperature melt extrusion apparatus for producing photocurable powder according to claim 1, characterized in that: A cooling cavity (42) is provided between the air outlet of the cooling fan (43) and the cooling sleeve (41), and the air outlet chamber (44) between the two cooling sleeves (41) is arranged around the side wall of the extrusion cylinder (36).

8. A low-temperature melt extrusion apparatus for producing photocurable powder according to claim 7, characterized in that: The cooling cavity (42) is connected to the air outlet chamber (44), and a convection hole (45) is provided between the two cooling sleeves (41). The convection hole (45) is located at the top of the extrusion cylinder (36).

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