Continuous production device for powder coating

Abstract

The utility model discloses a powder coating continuous production device, and relates to the technical field of powder coating production equipment. The production device comprises a mixing machine, an extruding machine, a roller type tablet press, a flour mill, a cyclone separator, a vibrating screen, an ultrafine powder dust collecting box, a high-pressure fan and a weighing and packaging system which are sequentially connected according to a production process route for continuous production. Continuous integrated production transformation is carried out on the basis of existing powder coating production line equipment, so that the powder coating is continuously produced and operated at each process node, the occupied area of a single production line is reduced, meanwhile, a recovery process and recovery production equipment are additionally arranged, and the production efficiency is improved. The waste of raw material transfer in the intermittent production process of the powder coating is reduced, the harm of field dust raising environment is avoided, the production efficiency of the powder coating is improved, and the labor cost in the production process is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of powder production, and more specifically relates to the technical field of continuous production of powder coatings, in particular to a continuous production device for powder coatings. Background Art

[0002] Powder coatings are composed of thermosetting synthetic resins, additives, and fillers. Different materials and formulations are selected based on the specific physical and mechanical properties of the protective coating, such as weather resistance, aging resistance, insulation, hardness, and color. A variety of powder coatings are produced through extrusion, grinding, screening, and collection. The coated parts are then cured by baking at appropriate temperatures, cross-linking the powder coating into a network of polymer compounds. This not only firmly adheres to the metal surface but also resists melting or fusion, resulting in excellent corrosion resistance and decorative properties. Dozens of colors are available. No organic solvents are added during the entire production and coating process, earning powder coating the nickname "green coating."

[0003] The production of powder coatings involves connecting different work sections in a reasonable sequence (including the preparation time for the pre-mixing step, the preparation time for the main equipment, and the quality control time). Usually, the production process of a powder coating factory is discontinuous. Generally, the powder raw materials are pre-mixed in the mixer equipment and then fed to the extruder feed port. At the same time, the molten extruded material is often transferred and fed after cooling to the grinding. This intermittent production method has high labor costs, and some external impurities are often mixed into the powder material during the operation process. At the same time, it is easy to generate some powder coating waste, resulting in adverse environmental impacts such as dust on site. For powder coating factories with high production capacity, it is usually necessary to combine each individual process into a continuous production process. However, there are also some problems such as discontinuous production equipment and large floor space occupied by a single production line. Therefore, it is necessary to develop a continuous and stable powder coating production device to reduce the floor space occupied by the production device, meet the continuity of powder coating production, avoid the generation of powder coating production waste, and at the same time, recycle some recovered unqualified powder for secondary use. Summary of the Invention

[0004] In order to solve the above production problems, the present invention provides a continuous production device for powder coatings.

[0005] The utility model discloses a continuous production device for powder coatings, which comprises a mixer, an extruder, a roller tablet press, a grinder, a cyclone separator, a vibrating screen, an ultrafine powder dust collection box, a high-pressure fan, and a weighing and packaging system that are sequentially connected according to a production process route for continuous production. The mixer is connected to a feeding valve, which is connected to an extruder, which is connected to a roller tablet press, and the extruder and the roller tablet press are externally connected to a mold temperature controller for cooling. The roller tablet press is connected to a discharge valve, which is connected to a discharge valve. The material valve is connected to the grinding mill through the material conveying pipeline. The grinding mill is equipped with a conveying valve and is connected to the cyclone separator through a conveying pipe. The grinding mill is connected to the cyclone separator through the conveying valve and the conveying pipe. The bottom of the cyclone separator is connected to a vibrating screen and the top is connected to an ultrafine powder dust collecting box. The top of the ultrafine dust collecting box is connected to a high-pressure fan, providing negative pressure airflow for the entire production device to convey and separate materials. A separation valve is provided between the cyclone separator and the vibrating screen. A discharge port is provided under the vibrating screen, and a weighing and packaging system is provided directly below the discharge port.

[0006] The mixer is arranged above the feed port of the extruder, a stirring device is installed in the mixer, and the mixer has an interlayer, which is connected to the mold temperature controller to reduce the friction heat generated by the raw materials during the mixing process.

[0007] The extruder is arranged below the mixer. The extruder is a twin-screw extruder. The core shaft in the extruder is connected to the mold temperature controller to cool the material when it is melted and extruded.

[0008] Among them, the roller tablet press has a pressing roller connected to a mold temperature controller, and a cooling liquid is passed through the roller tablet press to press the tablets into sheets for output.

[0009] The grinding mill includes a main mill for grinding flaky materials into powdery materials and a grading mill for screening out materials that meet the requirements. The grading mill is connected to a cyclone separator for separating materials from airflow.

[0010] The cyclone separator is used to separate the powder after grinding, grading and screening. The separated powder is sieved to obtain powder coating, and the separated ultrafine powder is recycled for secondary treatment.

[0011] The powder coating continuous production device of the present invention is based on the existing powder coating production line equipment, and the structures of the mixer, extruder and roller tablet press on the production line are modified to enable them to have a sandwich structure that is matched with the mold temperature controller, so that the material temperature in each process node can be controlled and adjusted. The present invention has different temperature settings in the mixing, extrusion and tableting production processes. When the mixer is turned over and mixed, it is easy to cause the material friction to cause the local material temperature to be too high, and it is easy to cause pre-reaction phenomenon, resulting in changes in the physical and chemical properties of the product. Therefore, the mixer in the premixing process of the present application is provided with a cooling interlayer and a stirring device to fully mix the materials. At the same time, while reducing the frictional heat generated by the material, the temperature distribution of the material is made more uniform; during the extrusion process, once the temperature of the extrusion process is not well controlled, the product will gel and easily stick to the extruder screw core shaft. Therefore, the extrusion process of this application is provided with internal cooling of the core shaft to prevent internal gelation and adhesion of the equipment; when the tableting cooling temperature is higher than 40°C, the product is not brittle enough and cannot be crushed into granules by roller pressing, and gelation is also likely to occur at this time, resulting in poor product quality. During the tableting and crushing process of this application, coolant is introduced into the inside of the pressing roller to always control the material temperature below 30°C, so that the crushed material remains crystalline, so that the material can be easily ground into powder when entering the grinding mill.

[0012] In addition, a stirring device is added to the mixer of the production device, and the pre-mixing of materials can be completed on the continuous production device line, without the need for offline intermittent pre-mixing operations, making its production more continuous. At the same time, a pipeline is added between the roller tablet press and the grinder to eliminate the need for stockpiling and manual transfer of intermediate materials, reduce the impact of external impurities and manpower, and enable each individual process to achieve continuous production connection. At the same time, each individual process node undergoes continuous integrated production transformation, so that the powder coating can be continuously produced and operated at each process node, reducing the footprint of a single production line. At the same time, a recycling process and its recycling production equipment are added to reduce the waste of raw material transfer in the intermittent production process of powder coatings, avoid the environmental hazards of on-site dust, improve the production efficiency of powder coatings, and save labor costs in the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the continuous production device of powder coatings described in the present utility model.

[0014] Explanation of the accompanying symbols: 1. Mixer, 2. Extruder, 3. Roller tablet press, 4. Grinding mill, 5. Cyclone separator, 6. Vibrating screen, 7. Ultrafine powder dust collecting box, 8. High-pressure fan, 9. Weighing and packaging system, 10. Mold temperature controller.

[0015] 101. Stirring device, 201. Feeding valve, 202. Screw, 301. Discharging valve, 401. Main mill, 402. Classifying mill, 403. Delivery valve, 501. Delivery pipe, 601. Separation valve. DETAILED DESCRIPTION

[0016] The continuous production device for powder coatings of the present invention will be further described below with reference to the accompanying drawings.

[0017] To realize the continuous production of powder coatings according to the present invention, see Figure 1 .

[0018] like Figure 1 As shown, the production device includes a mixer 1, an extruder 2, a roller tablet press 3, a grinder 4, a cyclone separator 5, a vibrating screen 6, an ultrafine powder dust collection box 7, a high-pressure blower 8, and a weighing and packaging system 9 connected in sequence according to the production process route for continuous production. The mixer 1 is connected to a feeding valve 201, the feeding valve 201 is connected to the extruder 2, the extruder 2 is connected to the roller tablet press 3, the extruder 2 and the roller tablet press 3 are externally connected to a mold temperature controller 10 for cooling, and the roller tablet press 3 is connected to a discharge valve 3 01, the discharge valve 301 is connected to the grinding mill 4 through the material conveying pipeline, the grinding mill 4 is provided with a conveying valve 403, and is connected to the cyclone separator 5 through the conveying pipe 501. The grinding mill 4 is connected to the cyclone separator 5 through the conveying valve 403 and the conveying pipe 501. The bottom of the cyclone separator 5 is connected to the vibrating screen 6, and the top is connected to the ultrafine powder dust box 7. The top of the ultrafine dust box 7 is connected to the high-pressure fan 8, providing negative pressure airflow for the entire production device to convey and separate materials. A separation valve 60 is provided between the cyclone separator 5 and the vibrating screen 6. 1, a discharge port is provided below the vibrating screen 6, and a weighing and packaging system 9 is provided just below the discharge port; wherein, the mixer 1 is provided above the feeding port of the extruder 2, and a stirring device 101 is installed in the mixer 1, and the mixer 1 has an interlayer, which is connected to the mold temperature controller 10 to reduce the friction heat generated by the raw materials during the mixing process; the extruder 2 is provided below the mixer 1, and the extruder 2 is a twin-screw extruder, and the core shaft in the extruder is connected to the mold temperature controller 10 to cool the material when it is melted and extruded; the roller The roller tablet press 3 is connected to the mold temperature controller 10, and the cooling liquid is passed through to press the tablets into output tablets; the grinding mill 4 includes a main mill 401 for grinding the flaky material into powdered material and a grading mill 402 for screening the material that meets the requirements, and the grading mill 402 is connected to a cyclone separator 5 for separating the material and the airflow; the cyclone separator 5 is used to separate the powder after grinding, grading and screening. The separated powder is sieved to obtain powder coating, and the separated ultrafine powder is recycled for secondary treatment.

[0019] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the scope of protection of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art may make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the scope of protection defined by the claims appended hereto.

Claims

1. A continuous production device for powder coatings, characterized in that: The production device includes a mixer, an extruder, a roller tablet press, a grinder, a cyclone separator, a vibrating screen, an ultrafine powder dust collection box, a high-pressure fan, and a weighing and packaging system equipment that are connected in sequence according to the production process route for continuous production. The mixer is connected to a feeding valve, the feeding valve is connected to the extruder, the extruder is connected to the roller tablet press, the extruder and the roller tablet press are externally connected to a mold temperature controller for cooling, the roller tablet press is connected to a discharge valve, the discharge valve is connected to the grinder through a pipeline for conveying materials, the grinder is provided with a conveying valve, and is connected to the cyclone separator through a conveying pipe, the grinder is connected to the cyclone separator through a conveying valve and a conveying pipe, the bottom of the cyclone separator is connected to the vibrating screen, the top is connected to the ultrafine powder dust collection box, the top of the ultrafine dust collection box is connected to the high-pressure fan, providing negative pressure airflow for the entire production device, conveying and separating materials, a separation valve is provided between the cyclone separator and the vibrating screen, a discharge port is provided under the vibrating screen, and a weighing and packaging system is provided directly below the discharge port.

2. The continuous production device for powder coating according to claim 1, characterized in that: The mixer is arranged above the feed port of the extruder, a stirring device is installed in the mixer, and the mixer has an interlayer, which is connected to the mold temperature controller to reduce the friction heat generated by the raw materials during the mixing process.

3. The continuous production device for powder coating according to claim 1, characterized in that: The extruder is arranged below the mixer. The extruder is a twin-screw extruder. The core shaft in the extruder is connected to the mold temperature controller to cool the material when it is melted and extruded.

4. The continuous production device for powder coating according to claim 1, characterized in that: The roller tablet press has a pressing roller connected to a mold temperature controller, and a cooling liquid is passed through the pressing roller to press the tablets into sheets for output.

5. The continuous production device for powder coating according to claim 1, characterized in that: The grinding mill includes a main mill for grinding flaky materials into powdery materials and a grading mill for screening out materials that meet the requirements. The grading mill is connected to a cyclone separator for separating materials from airflow.

6. The continuous production device for powder coating according to claim 1, characterized in that: The cyclone separator is used to separate the powder after grinding, grading and screening. The separated powder is sieved to obtain powder coating, and the separated ultrafine powder is recycled for secondary treatment.

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