Multi-section mixing processing screw structure of rare earth flame-retardant master batch

Abstract

The utility model relates to a multi-section mixing processing screw structure for rare earth flame-retardant master batches, in particular to a screw structure with a mixing section and a compression section respectively provided with a sectional heating device and a sectional cooling device. The screw main body comprises a feeding section, a mixing section, a compression section, an exhaust section and an extrusion section, the mixing section is provided with mixing teeth, the shearing force of materials is enhanced through a tooth-shaped structure, and uniform mixing of rare earth flame-retardant master batches and a base material is promoted; and the compression section performs high-pressure compression on the materials through thread design, so that the plasticizing effect is improved. Each section is provided with a temperature sensor, the heating device adjusts the temperature of the materials through a heating rod, the cooling device controls the temperature through cooling liquid circulation, and it is guaranteed that the temperature of the materials is kept stable in the machining process. In addition, the compression section is further provided with a pressure adjusting system, the exhaust section exhausts volatile gas in the materials through a vacuum device, and bubble residues are avoided. According to the utility model, through accurate temperature control and pressure control, the processing uniformity, the plasticizing effect and the product quality of the rare earth flame-retardant master batch are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi - stage mixing and processing screws, in particular to a multi - stage mixing and processing screw structure for rare - earth flame - retardant masterbatch. Background Art

[0002] In the modern plastic processing field, rare - earth flame - retardant masterbatch is an important functional additive material, which is widely used in the flame - retardant modification process of plastics. The processing process of rare - earth flame - retardant masterbatch usually relies on twin - screw or multi - stage screw extrusion equipment. Through the heating, mixing, compression and extrusion of materials, a uniform flame - retardant modified material is finally formed. However, in the prior art, the multi - stage screw structure faces problems such as unstable temperature control, uneven mixing, and poor plasticization effect during the processing of rare - earth flame - retardant masterbatch, which affects the quality and performance of the final product.

[0003] In traditional multi - stage screw processing equipment, the temperature control system often conducts unified heating or cooling for the entire screw structure. Such a design is difficult to meet the precise temperature requirements of different sections. Especially in the mixing section and the compression section, temperature fluctuations will cause uneven dispersion or insufficient plasticization of rare - earth flame - retardant masterbatch during the mixing process with the base material. In addition, due to the extreme sensitivity of rare - earth materials to temperature, if the temperature is not properly controlled during the processing, it may lead to a reduction in material properties and even loss of its flame - retardant effect. Therefore, how to precisely control the temperature of different sections of the screw has become a key technical problem in improving the processing quality and efficiency of rare - earth flame - retardant masterbatch.

[0004] In the prior art, some extrusion equipment optimizes the mixing and compression effects of materials by improving the screw structure, increasing mixing elements or enhancing pressure control, but often ignores the details of temperature control, resulting in the equipment being difficult to achieve ideal effects when processing rare - earth flame - retardant masterbatch and other temperature - sensitive materials.

[0005] In view of this, the inventor has specifically designed a multi - stage mixing and processing screw structure for rare - earth flame - retardant masterbatch, and this case is thus generated. Summary of the Utility Model

[0006] (1) Technical Problems to be Solved

[0007] The purpose of this application is to provide a multi - stage mixing and processing screw structure for rare - earth flame - retardant masterbatch, which solves at least the problem of unstable temperature control during the multi - stage screw mixing and plasticization of rare - earth flame - retardant masterbatch.

[0008] (2) Technical Solutions

[0009] To solve the above - mentioned technical problems, the utility model provides the following technical solutions:

[0010] The present application provides a multi-stage mixing and processing screw structure for rare earth flame retardant masterbatch, including a bracket and a screw body fixed on the bracket. The screw body is composed of a feeding section, a mixing section, a compression section, an exhaust section and an extrusion section. The mixing section and the compression section of the screw body are respectively provided with a heating device and a cooling device;

[0011] Among them, the heating device includes a heating rod and a temperature sensor. The cooling device includes a cooling sleeve, a coolant circulation pump and a coolant outlet and inlet connector. The heating device and the cooling device are electrically connected to an electric control box, and the electric control box realizes the temperature regulation of the mixing section and the compression section.

[0012] In a further aspect, mixing teeth for improving the mixing uniformity of the rare earth flame retardant masterbatch and the substrate are provided in the mixing section

[0013] In a further aspect, the pitch of the compression section gradually decreases.

[0014] In a further aspect, the temperature sensor is embedded inside the screw of the mixing section and the compression section for real-time monitoring of the material temperature and feedback of the temperature signal to the electric control box.

[0015] In a further aspect, the surface of the screw body is covered with a high-temperature and wear-resistant coating.

[0016] In a further aspect, the coating includes a ceramic coating.

[0017] In a further aspect, the coating includes titanium nitride.

[0018] (III) Beneficial effects

[0019] The present utility model has the following beneficial effects compared with the prior art:

[0020] Precise temperature control: By setting a segmented heating device and a cooling device in the mixing section and the compression section, the present invention realizes independent temperature control of each section. The temperature sensor monitors the temperature change of the material inside the screw in real time and feeds it back to the electric control system, automatically adjusting the heating or cooling device so that the temperature of each section is always maintained within the optimal range, avoiding the problems of uneven mixing or insufficient plasticization caused by temperature fluctuations in the traditional screw structure.

[0021] The following further describes in detail the specific implementation manners of the present utility model with reference to the accompanying drawings. Description of the drawings

[0022] In the drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2This is the overall schematic diagram highlighting each section of the present utility model.

[0025] Description of reference numerals in the figure: 1. Screw main body; 11. Feeding section; 12. Mixing section; 13. Compression section; 14. Exhaust section; 15. Extrusion section; 2. Mixing teeth; 3. Support; 4. Heating device; 41. Heating rod; 42. Temperature sensor; 5. Cooling device; 51. Cooling sleeve; 52. Coolant circulation pump; 53. Connector;

[0026] 6. Electric control box. Specific implementation mode

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model.

[0028] The present utility model relates to a multi-section mixing and processing screw structure for rare earth flame retardant masterbatch, especially a screw structure that separately sets sectional heating and cooling devices 5 in the mixing section 12 and the compression section 13 to ensure precise temperature control of the rare earth flame retardant masterbatch during the mixing and plasticizing processes. The screw structure of the present utility model enables the material to maintain an ideal temperature range during the processing through a sectional temperature control system, improving the mixing uniformity and plasticizing effect.

[0029] As Figure 2 shown, it includes a support 3 and a screw main body 1 fixed on the support 3. The screw main body 1 consists of multiple sections, mainly including a feeding section 11, a mixing section 12, a compression section 13, an exhaust section 14, and an extrusion section 15. Each section can effectively handle the mixing, compression, plasticizing, and extrusion of rare earth flame retardant masterbatch and other base materials through precise structural design and function optimization. The mixing section 12 and the compression section 13 are the core parts of this screw structure, equipped with sectional heating and cooling devices 5 to ensure the stability of the material temperature in these sections.

[0030] The main function of the mixing section 12 is to fully mix the rare earth flame retardant masterbatch with other base materials through highly efficient mixing teeth 2 to ensure uniform dispersion of the material. Multiple mixing teeth 2 are provided on the surface of the screw in the mixing section 12, and the shape of the mixing teeth 2 can be square teeth, triangular teeth, or wavy teeth. The mixing teeth 2 can exert a strong shearing force on the material, causing the material to be continuously sheared and mixed when flowing inside the screw, promoting the uniform dispersion of the flame retardant masterbatch in the base material.

[0031] As Figure 1As shown, a heating device 4 and a cooling device 5 are also provided in the mixing section 12. The heating device 4 includes a heating rod 41 and a temperature sensor 42. The heating rod 41 is installed on the outer wall of the screw, and its heating power is controlled by an electric control box 6 to ensure that the mixing section 12 of the screw is maintained at the set processing temperature. The cooling device 5 includes a cooling sleeve 51 and a coolant circulation system. The coolant circulates through the cooling sleeve 51 driven by a cooling pump to remove the excess heat generated during the operation of the screw, so as to prevent the material temperature from being too high and affecting its processing performance. The temperature sensor 42 is buried inside the screw to monitor the material temperature in real time and feedback the temperature signal to the electric control box 6 to adjust the working state of the heating rod 41 or the cooling system.

[0032] The compression section 13 is located behind the mixing section 12, and its main function is to compress and plasticize the material. The screw of the compression section 13 is designed with a gradually decreasing pitch and an increasing density of the threads, so that the material is under high pressure in this section, further increasing its density and promoting plasticization. To ensure that the material does not overheat or cool insufficiently under high pressure, the compression section 13 is also equipped with a heating device 4 and a cooling device 5.

[0033] As Figure 1 shown, the heating device 4 of the compression section 13 is similar to that of the mixing section 12, provided with a heating rod 41 and a temperature sensor 42, and the temperature sensor 42 monitors the temperature change of the material inside the screw in real time. When the temperature is lower than the set value, the heating rod 41 is started to ensure that the material is maintained at an appropriate plasticization temperature. At the same time, the cooling device 5 includes a cooling sleeve 51, a coolant circulation pump 52 and coolant outlet and inlet connectors 53. The cooling device 5 of the compression section 13 controls the material temperature through the coolant sleeve and the cooling pump to prevent the accumulation of excess heat generated during the compression process.

[0034] In addition, a pressure regulating system is also provided in the compression section 13. A pressure sensor is installed inside the screw to monitor the pressure exerted on the material. When the pressure in the compression section 13 exceeds the preset range, the regulating valve automatically adjusts the pressure of the material to ensure the smoothness of the screw processing process.

[0035] The exhaust section 14 is located behind the compression section 13, and its function is to remove the volatile substances and gases in the material to prevent bubbles from remaining in the material and affecting the performance of the final product. The exhaust section 14 is connected to the exhaust port through a vacuum pump to effectively discharge the gas in the material and ensure the density and uniformity of the material.

[0036] The extrusion section 15 is the last section of the screw structure, where the material is extruded by the pushing force of the screw to form the final product. In order to ensure that the temperature of the material before extrusion is appropriate, the extrusion section 15 is also equipped with an independent temperature control system. The temperature sensor 42 monitors the material temperature of the extrusion section 15. When the temperature deviates from the set value, the system automatically adjusts the heating or cooling device 5 to ensure that the material is extruded at the optimal temperature.

[0037] The screw structure is equipped with an automatic control system, which is connected to all temperature sensors 42, heating rods 41, cooling pumps and pressure sensors, and can monitor the temperature and pressure of each section of the screw in real time. When the temperature or pressure of a section deviates from the set range, the control system automatically adjusts the relevant devices to ensure the stability and efficiency of the processing process.

[0038] In order to increase the service life of the screw, the surface of the screw is covered with a layer of high temperature and wear-resistant coating. The coating is made of ceramic material or carbide material, which can effectively resist wear in high temperature and high shear force processing environment and extend the service life of the screw. The coating is evenly covered on the surface of the screw through the plasma spraying process to ensure that the screw maintains its high efficiency in long-term operation. The coating includes ceramic coating or titanium nitride.

[0039] When rare earth flame retardant masterbatch and other substrates enter the screw body 1 through the feeding section 11, the materials are first preliminarily mixed in the mixing section 12, and the mixing teeth 2 continuously shear and disperse the materials to ensure that the flame retardant masterbatch is evenly distributed. Subsequently, the materials enter the compression section 13 and are further compressed and plasticized under high pressure. Through the segmented heating and cooling device 5, the material temperature is kept within the ideal range during the entire processing process to avoid performance degradation caused by temperature fluctuations. In the exhaust section 14 after the compression section 13, the gas in the material is effectively removed, and finally the final product is formed through the extrusion section 15.

[0040] In summary, the utility model solves the problems of uneven mixing, insufficient plasticization and unstable temperature control of rare earth flame retardant masterbatch during processing by controlling the segmented heating and cooling of different sections of the screw, thereby significantly improving the processing quality and production efficiency of the product.

[0041] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A multi-stage mixing processing screw structure for rare earth flame retardant masterbatch, characterized in that: The invention comprises a support (3) and a screw body (1) fixed on the support (3), wherein the screw body (1) is composed of a feeding section (11), a mixing section (12), a compression section (13), an exhaust section (14) and an extrusion section (15), and the mixing section (12) and the compression section (13) of the screw body (1) are respectively provided with a heating device (4) and a cooling device (5); The heating device (4) comprises a heating rod (41) and a temperature sensor (42); the cooling device (5) comprises a cooling sleeve (51), a coolant circulation pump (52) and coolant outlet and inlet connectors (53); the heating device (4) and the cooling device (5) are electrically connected to an electric control box (6); and the electric control box (6) is used to adjust the temperature of the mixing section (12) and the compression section (13).

2. The multi-stage mixing screw structure for rare earth flame retardant masterbatch according to claim 1, characterized in that: The mixing section (12) is provided with mixing teeth (2) for improving the uniformity of mixing the rare earth flame retardant masterbatch and the base material.

3. The multi-stage mixing processing screw structure of the rare earth flame retardant masterbatch according to claim 1 is characterized in that: The pitch of the compression section (13) is gradually reduced.

4. The multi-stage mixing screw structure for rare earth flame retardant masterbatch according to claim 3, characterized in that: The temperature sensor (42) is embedded in the screws of the mixing section (12) and the compression section (13) to monitor the material temperature in real time and feed back the temperature signal to the electric control box (6).

5. The multi-stage mixing screw structure for rare earth flame retardant masterbatch according to claim 4, characterized in that: The surface of the screw body (1) is covered with a high temperature resistant and wear resistant coating.

6. The multi-stage mixing screw structure for rare earth flame retardant masterbatch according to claim 5, characterized in that: The coating comprises a ceramic coating.

7. The multi-stage mixing screw structure for rare earth flame retardant masterbatch according to claim 5, characterized in that: The coating includes titanium nitride.

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