Polystyrene flame retardant blended high shear extrusion screw

Abstract

The utility model discloses a polystyrene fire -retardant blending high shear extrusion screw rod, including installation ring, annular slide, first rotation axis, second rotation axis, third rotation axis and main screw rod and first, second vice screw rod, and main screw rod is composed of first bolt, second mounting disc, shear disc etc. component, and the transmission and fixed of each component are realized through gear meshing, bolt connection etc. mode, through the motor drive installation ring annular slide rotation, drives each rotation axis, makes main, vice screw rod rotate in different rotating speed cooperation, and the cooperation of main screw rod shear disc and vice screw rod thread is combined, and the material is extruded, stretched, sheared and rubbed, simultaneously, utilize self -shear heat generation and external heating maintain material melting temperature, and the screw rod end bolt section forms back pressure and promotes material homogenization, and this structure effectively solves the problem of flame retardant agglomeration, realizes the efficient uniform blending of polystyrene and flame retardant, and improves product quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of polymer material processing technology, and in particular to a high-shear extrusion screw for flame-retardant polystyrene blends. Background Technology

[0002] In the field of polystyrene flame-retardant blending, traditional extrusion screws have many limitations. Currently common single-screw or twin-screw extrusion equipment struggles to achieve good mixing results when processing polystyrene and flame retardants, especially for high-viscosity flame retardants or systems requiring fine dispersion. This often leads to flame retardant agglomeration, resulting in uneven flame-retardant performance in the products, affecting product quality and safety. Furthermore, the traditional screw structure has limited shearing, stretching, and kneading effects on the material, failing to adequately break down the polystyrene raw material. This prevents the flame retardant from being evenly dispersed in the melt, reducing blending efficiency and product performance. In addition, traditional screws often rely on external heating for temperature control, underutilizing the heat generated by their own friction and shearing, resulting in energy waste. They also struggle to accurately maintain the material at the appropriate processing temperature, affecting blending effects and product stability. Therefore, it is necessary to develop a new type of extrusion screw to solve these problems and improve the quality and production efficiency of polystyrene flame-retardant blends. Utility Model Content

[0003] The purpose of this utility model is to at least solve the technical problems existing in the prior art. First, we provide a high-shear extrusion screw for polystyrene flame-retardant blending, featuring a multi-axis synergistic shearing structure. A motor drives an annular slider within a mounting ring, which in turn drives the first, second, and third rotating shafts, causing the main screw, first auxiliary screw, and second auxiliary screw to rotate synergistically at different speeds. This multi-axis structure and the coordination of different speeds allow for action on the material from various angles and positions. Compared to traditional single-screw or twin-screw extruders, it more effectively mixes, shears, and conveys polystyrene raw materials and flame retardants, enhancing the mixing effect. It is particularly suitable for processing high-viscosity flame retardants or systems requiring fine dispersion, solving the problem of flame retardant agglomeration. The shearing disc on the main screw rotates at high speed while being fixed by the first and second mounting discs. Its surface teeth cooperate with the threads of the auxiliary screws to stretch, shear, and knead the material, breaking down the polystyrene raw material and uniformly dispersing the flame retardant in the melt.

[0004] This utility model also provides a polystyrene flame-retardant blend high-shear extrusion screw with the above-mentioned polystyrene flame-retardant blend, an mounting ring, an annular slider fixedly connected to the inner wall of the mounting ring, a third rotating shaft rotatably connected to the inner wall of the annular slider, a second pinion fixedly connected to the outer rear end of the third rotating shaft, a toothed ring meshing with the outer surface of the second pinion, a large gear meshing with the end of the second pinion away from the toothed ring, a second rotating shaft provided at the front end of the large gear, and a main screw provided at the front end of the second rotating shaft; The main screw includes a first bolt, a second mounting plate, a shearing plate, a third mounting plate, a first mounting plate, a fourth mounting plate, a second bolt, and a bolt segment.

[0005] According to the polystyrene flame-retardant blend high-shear extrusion screw, a second auxiliary screw is provided at the front end of the third rotating shaft.

[0006] By adopting the above technical solution, a second auxiliary screw is provided at the front end of the third rotating shaft, so that the extrusion screw has a multi-shaft structure. The second auxiliary screw works in conjunction with the main screw and other components, which helps to enhance the mixing, shearing and conveying capabilities of materials and improve the blending effect.

[0007] According to the polystyrene flame-retardant blend high-shear extrusion screw, the outer surface of the annular slider is rotatably connected to a first rotating shaft, the outer rear end of the first rotating shaft is fixedly connected to a first pinion, the outer surface of the first pinion meshes with a large gear, and the front end of the first rotating shaft is provided with a first auxiliary screw.

[0008] By adopting the above technical solution, the multi-axis structure of the extrusion screw, with the first auxiliary screw cooperating with the main screw and the second auxiliary screw, rotates in coordination at different speeds to act on the material from different angles and positions, thereby better achieving the mixing, dispersion and extrusion of polystyrene raw materials and flame retardants.

[0009] According to the polystyrene flame-retardant blend high-shear extrusion screw, a bolt rod is fixedly connected to the front end of the second rotating shaft, and the front end of the bolt rod is fixedly connected to the first mounting plate.

[0010] By adopting the above technical solution, the solid connection between the main screw and the second rotating shaft enables the main screw to rotate stably under the drive of the second rotating shaft, ensuring the reliability and stability of the main screw during operation, and thus ensuring the normal operation of the entire extrusion screw.

[0011] According to the polystyrene flame-retardant blend high-shear extrusion screw, the front end of the first bolt passes through the first mounting plate and extends to the second mounting plate, and the outer surface of the second mounting plate is threadedly connected to the first bolt.

[0012] By adopting the above technical solution, the first mounting plate and the second mounting plate are fastened together, which also provides a foundation for the installation and fixation of the shearing plate, ensuring that the shearing plate can be stably installed on the main screw and rotate at high speed with the main screw to achieve the shearing action on the material.

[0013] According to the polystyrene flame-retardant blend high-shear extrusion screw, the front end of the second mounting disc is fixedly connected to the shear disc, and the front end of the shear disc is fixedly connected to the third mounting disc.

[0014] By adopting the above technical solution, the shearing disc is accurately and stably installed on the main screw, enabling the shearing disc to effectively shear, stretch and knead the material, crush the polystyrene raw material and evenly disperse the flame retardant in the melt.

[0015] According to the polystyrene flame-retardant blend high-shear extrusion screw, the front surface of the third mounting disc is in close contact with the fourth mounting disc, the rear end of the second bolt passes through the fourth mounting disc and extends to the third mounting disc, and the inner wall of the third mounting disc is threadedly connected to the second bolt.

[0016] By adopting the above technical solution, the fourth mounting plate is fastened to the third mounting plate by the second bolt, ensuring that the fourth mounting plate is fixed on the main screw. At the same time, it also ensures the structural integrity of the screw metering section, which helps to further increase the axial pressure when the material moves to the screw metering section and promotes the homogenization of the material.

[0017] According to the polystyrene flame-retardant blend high-shear extrusion screw, the front end of the fourth mounting disc is fixedly connected to the bolt section, and there are two fourth mounting discs distributed at the front and rear ends.

[0018] By adopting the above technical solution, two fourth mounting discs are distributed at the front and rear ends and are fixedly connected to the bolt section, together forming the end structure of the screw. During the material extrusion process, back pressure is formed to prevent insufficiently mixed materials from being extruded prematurely, so that the material is further plasticized and uniform at the end of the screw, thereby improving the quality of the extruded products.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 is an overall structural diagram of the polystyrene flame-retardant blend high-shear extrusion screw of this utility model; Figure 2 is a structural diagram of the main screw of the polystyrene flame-retardant blend high-shear extrusion screw of this utility model; Figure 3 is an enlarged view of point B in Figure 1; Figure 4 is Figure 2 Enlarged view of point A in the middle.

[0021] Legend: 1. First auxiliary screw; 2. Main screw; 3. Second auxiliary screw; 4. Mounting ring; 5. Gear ring; 6. First pinion; 7. First rotating shaft; 8. Large gear; 9. Second rotating shaft; 10. Second pinion; 11. Third rotating shaft; 12. First mounting plate; 13. First bolt; 14. Second mounting plate; 15. Shearing plate; 16. Third mounting plate; 17. Fourth mounting plate; 18. Second bolt; 19. Annular slider; 20. Bolt rod; 21. Bolt segment. Detailed Implementation

[0022] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0023] Referring to Figures 1-4, the polystyrene flame-retardant blend high-shear extrusion screw of this embodiment includes a mounting ring 4. An annular slider 19 is fixedly connected to the inner wall of the mounting ring 4. A third rotating shaft 11 is rotatably connected to the inner wall of the annular slider 19. The rear end of the third rotating shaft 11 is externally... A second pinion 10 is fixedly connected to the side. A toothed ring 5 is meshed with the outer surface of the second pinion 10. A large gear 8 is meshed with the end of the second pinion 10 away from the toothed ring (5). A second rotating shaft 9 is provided at the front end of the large gear 8. A main screw 2 is provided at the front end of the second rotating shaft 9.

[0024] The front end of the third rotating shaft 11 is provided with a second auxiliary screw 3, the outer surface of the annular slider 19 is rotatably connected to the first rotating shaft 7, the outer rear end of the first rotating shaft 7 is fixedly connected to the first pinion 6, the outer surface of the first pinion 6 is meshed with the large gear 8, the front end of the first rotating shaft 7 is provided with a first auxiliary screw 1, the front end of the second rotating shaft 9 is fixedly connected to the bolt rod 20, and the front end of the bolt rod 20 is fixedly connected to the first mounting plate 12.

[0025] The main screw 2 includes a first bolt 13, a second mounting plate 14, a shearing plate 15, a third mounting plate 16, a first mounting plate 12, a fourth mounting plate 17, a second bolt 18, and a bolt segment 21.

[0026] The front end of the first bolt 13 passes through the first mounting plate 12 and extends to the second mounting plate 14. The outer surface of the second mounting plate 14 is threadedly connected to the first bolt 13. The front end of the second mounting plate 14 is fixedly connected to the shearing plate 15. The front end of the shearing plate 15 is fixedly connected to the third mounting plate 16. The front surface of the third mounting plate 16 is tightly fitted to the fourth mounting plate 17. The rear end of the second bolt 18 passes through the fourth mounting plate 17 and extends to the third mounting plate 16. The inner wall of the third mounting plate 16 is threadedly connected to the second bolt 18. The front end of the fourth mounting plate 17 is fixedly connected to the bolt segment 21. There are two fourth mounting plates 17, which are distributed at the front and rear ends.

[0027] Working principle: Suitable for the blending and processing of polystyrene with various flame retardants, especially suitable for processing high-viscosity flame retardants or systems requiring fine dispersion. It solves the problem of flame retardant agglomeration through a multi-axis shearing structure. First, the polystyrene raw material and flame retardant are mixed in proportion and then fed into the hopper. The material falls into the screw feed section by gravity. Driven by the transmission system, the motor drives the annular slider 19 in the mounting ring 4 to rotate, which in turn drives the first rotating shaft 7, the second rotating shaft 9, and the third rotating shaft 11. Through the meshing transmission of the first pinion 6 and the large gear 8, the second pinion 10 and the gear ring 5 and the large gear 8, the main screw 2, the first auxiliary screw 1, and the second auxiliary screw 3 rotate in coordination at different speeds.

[0028] After the material enters the screw compression section, the triaxial gap formed by the main screw 2 and the two auxiliary screws gradually decreases, compressing the material. The shearing disc 15 on the main screw 2 rotates at high speed under the fixation of the first mounting disc 12 and the second mounting disc 14. Its surface teeth cooperate with the threads of the auxiliary screws to stretch, shear, and knead the material, breaking down the polystyrene raw material and dispersing the flame retardant evenly in the melt. As the material moves towards the screw metering section, the axial pressure further increases at the fourth mounting disc 17 and the bolt section 21. In conjunction with the screw conveying threads, the material is homogenized in the molten state. During this process, the heat generated by the rotational friction of the transmission system and the shearing of the material, combined with the external heating device, maintains the material temperature at the polystyrene melting temperature. Finally, under the back pressure formed by the bolt section 21 at the end of the screw, the homogenized material is prevented from prematurely extruding unmixed material. After further plasticization and homogenization, it is extruded from the die. After cooling and shaping processes, a polystyrene flame-retardant blend product that meets the requirements is produced.

[0029] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A high-shear extrusion screw for flame-retardant polystyrene blends, characterized in that, include: Mounting ring (4), the inner wall of which is fixedly connected to an annular slider (19), the inner wall of which is rotatably connected to a third rotating shaft (11), the outer rear end of which is fixedly connected to a second pinion (10), the outer surface of which is meshed with a toothed ring (5), the end of which is away from the toothed ring (5) is meshed with a large gear (8), the front end of which is provided with a second rotating shaft (9), and the front end of which is provided with a main screw (2); The main screw (2) includes a first bolt (13), a second mounting plate (14), a shearing plate (15), a third mounting plate (16), a first mounting plate (12), a fourth mounting plate (17), a second bolt (18), and a bolt segment (21).

2. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The front end of the third rotating shaft (11) is provided with a second auxiliary screw (3).

3. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The outer surface of the annular slider (19) is rotatably connected to a first rotating shaft (7), and a first small gear (6) is fixedly connected to the outer rear end of the first rotating shaft (7). The outer surface of the first small gear (6) meshes with a large gear (8), and a first auxiliary screw (1) is provided at the front end of the first rotating shaft (7).

4. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The front end of the second rotating shaft (9) is fixedly connected to a bolt rod (20), and the front end of the bolt rod (20) is fixedly connected to the first mounting plate (12).

5. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The front end of the first bolt (13) passes through the first mounting plate (12) and extends to the second mounting plate (14), and the outer surface of the second mounting plate (14) is threadedly connected to the first bolt (13).

6. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, Its features are, The front end of the second mounting plate (14) is fixedly connected to the shearing plate (15), and the front end of the shearing plate (15) is fixedly connected to the third mounting plate (16).

7. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The front surface of the third mounting plate (16) is in close contact with the fourth mounting plate (17), the rear end of the second bolt (18) passes through the fourth mounting plate (17) and extends to the third mounting plate (16), and the inner wall of the third mounting plate (16) is threadedly connected to the second bolt (18).

8. The polystyrene flame-retardant blend high-shear extrusion screw according to claim 1, characterized in that, The front end of the fourth mounting plate (17) is fixedly connected to the bolt section (21), and there are two fourth mounting plates (17) distributed at the front end and the rear end.

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