A twin screw structure of a twin screw extruder

Abstract

The utility model relates to double screw structure technical field, concretely to a kind of double screw structure of double screw extruder, the double screw structure includes processing piece and mounting piece, mounting piece is arranged in the side of processing piece;Processing piece includes shaft core, charging section, melting plasticizing section, exhaust section and pressure building conveying section, charging section, melting plasticizing section, exhaust section and pressure building conveying section are arranged in the outside of shaft core, and charging section, melting plasticizing section, exhaust section and pressure building conveying section are distributed by one side to the other side direction along the length direction of shaft core, charging section and exhaust section adopt large pitch element, melting plasticizing section and pressure building conveying section adopt small pitch element, the side of shaft core close to charging section is provided with connecting shaft, the side of shaft core close to mounting piece is provided with support shaft.The utility model has the advantages of simple structure, reasonable design, functional, while can give consideration to material conveying efficiency and plasticizing quality, especially suitable for the advantages of hot sensitivity material gentle processing.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw structure, specifically to a twin-screw structure for a twin-screw extruder. Background Technology

[0002] In the field of twin-screw extruder technology, the twin-screw structure is the core working component, and its performance directly determines the mixing effect of materials, extrusion output and final product quality.

[0003] The existing twin-screw structure is relatively complex and poorly designed. Moreover, the existing structure adopts a single pitch design, which makes it difficult to meet the rapid filling requirements of the feeding stage and the strong shear requirements of the plasticizing stage at the same time. This can easily lead to problems such as starvation feeding or excessive temperature rise. Especially when processing hygroscopic materials, the lack of a dedicated venting structure results in a high rate of internal bubbles in the product. To address this problem, the inventors designed a twin-screw structure for a twin-screw extruder. Utility Model Content

[0004] The purpose of this invention is to provide a twin-screw structure for a twin-screw extruder, which has the advantages of simple structure, reasonable design, full functionality, and can take into account both material conveying efficiency and plasticizing quality. It is especially suitable for the gentle processing of heat-sensitive materials, thus solving the problems mentioned in the above technical background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a twin-screw structure for a twin-screw extruder, the twin-screw structure comprising a processing component and an mounting component, wherein the mounting component is disposed on one side of the processing component; The processed component includes a shaft core, a feeding section, a melting and plasticizing section, an venting section, and a pressure-building conveying section. The feeding section, melting and plasticizing section, venting section, and pressure-building conveying section are located outside the shaft core and are distributed from one side to the other along the length of the shaft core. The feeding section and venting section use large-pitch elements, while the melting and plasticizing section and pressure-building conveying section use small-pitch elements.

[0006] Preferably, a connecting shaft is provided on the side of the shaft core near the feeding section, and a support shaft is provided on the side of the shaft core near the mounting component.

[0007] Preferably, the mounting component includes a fixing plate, a support column, a connecting groove, and a guide groove. The support column is fixed to the surfaces on both sides of the fixing plate, the connecting groove is opened on both sides of the fixing plate, the support shaft is located inside the connecting groove, and the guide groove is opened in the middle of the fixing plate.

[0008] Preferably, the two sides of the fixing plate near the end of the support column are fixed with support plates, and the support plates have movable grooves inside.

[0009] Preferably, a connecting block is provided inside the movable groove, an mounting plate is fixed on the upper surface of the connecting block, a bearing is fixed on the surface of the mounting plate, and the support shaft is located inside the bearing.

[0010] Preferably, a guide post is fixed to the outer surface of the connecting block, the guide post is connected through the interior of the support plate, and a support block is fixed to the surface of the support plate away from the mounting plate.

[0011] Preferably, the support block and the guide post are internally threaded with threaded posts, and a guide plate is fixed to the surface of the threaded posts.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model provides a twin-screw structure for a twin-screw extruder. The twin-screw structure includes a processing component and an installation component. The processing component includes a shaft core, a feeding section, a melting and plasticizing section, a venting section, and a pressure-building and conveying section. The overall structure is simple and rationally designed. Through differentiated pitch design, namely, the feeding section and the venting section have a large pitch design, while the melting and plasticizing section and the pressure-building and conveying section have a small pitch design, which takes into account both material conveying efficiency and plasticizing quality. It is especially suitable for the gentle processing of heat-sensitive materials. Moreover, the venting section is set independently, which significantly improves the devolatilization effect and can effectively remove trace amounts of moisture or low molecular weight substances from the material, thereby improving product quality.

[0013] 2. This utility model, through the design of placing the connecting groove and locking it with the sliding bearing seat, compared with the traditional flange connection method that requires the removal of a large number of bolts, can greatly shorten the installation and disassembly time of the screw, improve maintenance efficiency and equipment utilization. Moreover, the design of the connecting groove and the guide column ensures that the support shaft can return to the precise predetermined position every time it is installed, ensuring the coaxiality of the screw and the barrel, stable operation, and avoiding wall scraping. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a structural diagram of the machined part of this utility model; Figure 3 This is a structural diagram of the mounting component of this utility model; Figure 4 This is a structural diagram of the support plate of this utility model.

[0015] The reference numerals and names in the figure are as follows: 1. Machining parts; 11. Shaft core; 12. Connecting shaft; 13. Support shaft; 14. Feeding section; 15. Melting and plasticizing section; 16. Exhausting section; 17. Pressure building and conveying section; 2. Mounting parts; 21. Fixing plate; 22. Support column; 23. Connecting groove; 24. Guide groove; 25. Bearing; 26. Mounting plate; 27. Support plate; 28. Movable groove; 29. ​​Connecting block; 291. Guide column; 292. Support block; 293. Threaded column; 294. Guide plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical 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 embodiment of the invention according to the specific circumstances.

[0019] Please see Figures 1 to 4The present invention provides an embodiment of a twin-screw extruder, the twin-screw structure comprising a processing component 1 and a mounting component 2, the mounting component 2 being disposed on one side of the processing component 1; The processed part 1 includes a shaft core 11, a feeding section 14, a melting and plasticizing section 15, an venting section 16, and a pressure building and conveying section 17. The feeding section 14, the melting and plasticizing section 15, the venting section 16, and the pressure building and conveying section 17 are arranged outside the shaft core 11 and are distributed from one side to the other along the length of the shaft core 11. The feeding section 14 and the venting section 16 use large pitch elements, while the melting and plasticizing section 15 and the pressure building and conveying section 17 use small pitch elements.

[0020] The shaft core 11 serves as the "skeleton" of the entire screw and the power transmission shaft. The feeding section 14 can quickly and massively ingest solid materials from the hopper and convey them forward at a high speed. The melting and plasticizing section 15 compresses the loose materials from the feeding section 14, increasing the material density. At the same time, the smaller screw pitch increases the shear force and residence time of the material. Under the combined action of external heating of the barrel and internal friction of the material, the solid material gradually melts into a homogeneous melt and completes the initial mixing. The venting section 16 causes the compressed material to suddenly expand, reducing the filling degree and forming a half-full state. This provides space and surface for the moisture, air, and other low-molecular-weight volatiles entrained in the material to escape. The pressure building and conveying section 17 performs final compression on the fully plasticized and uniformly mixed melt, establishing a stable and sufficient pressure, forcing the melt to pass through the die head mold at a constant flow rate, thereby forming a product with the required cross-sectional shape.

[0021] A connecting shaft 12 is provided on the side of the shaft core 11 near the feeding section 14, and a support shaft 13 is provided on the side of the shaft core 11 near the mounting part 2.

[0022] The connecting shaft 12 is connected to the gearbox or drive motor output shaft via splines or keyways. It is the power source for the rotation of the entire screw structure. The support shaft 13 bears the weight of the screw and the radial force during operation, ensuring that the end of the screw remains centered in the barrel and rotates stably, preventing the end from swinging or scraping the barrel.

[0023] Mounting component 2 includes a fixing plate 21, a support column 22, a connecting groove 23, and a guide groove 24. The support column 22 is fixed to the surfaces on both sides of the fixing plate 21, the connecting groove 23 is opened on both sides of the fixing plate 21, the support shaft 13 is located inside the connecting groove 23, and the guide groove 24 is opened in the middle of the fixing plate 21.

[0024] The fixed plate 21 is the basic platform of the entire mounting component 2. It is fixed to the extruder frame by the support column 22. It bears all the support and locking mechanisms. When installing the screw, the support shaft 13 can be easily put into the connecting groove 23 to achieve quick initial centering and support. The guide groove 24 does not affect the normal operation of the material.

[0025] Support plates 27 are fixed on both sides of the fixed plate 21 near the support column 22, and the support plate 27 has a movable groove 28 inside.

[0026] The movable groove 28 inside the support plate 27 allows the connecting block 29 to move laterally, realizing the dynamic adjustment function.

[0027] The movable groove 28 is provided with a connecting block 29. The upper surface of the connecting block 29 is fixed with a mounting plate 26. The surface of the mounting plate 26 is fixed with a bearing 25. The support shaft 13 is located inside the bearing 25.

[0028] The connecting block 29 drives the mounting plate 26 and the bearing 25 to move synchronously, completing the radial fine adjustment of the support shaft 13. The mounting plate 26 is used to support and install the bearing 25, and the bearing 25 provides rotational support.

[0029] A guide post 291 is fixed on the outer surface of the connecting block 29. The guide post 291 passes through and is connected to the inside of the support plate 27. A support block 292 is fixed on the surface of the support plate 27 away from the mounting plate 26.

[0030] The guide post 291 facilitates changing the position of the connecting block 29, while the support block 292 is used for the threaded post 293 to rotate inside it.

[0031] The support block 292 and the guide post 291 are internally threaded with a threaded post 293, and a guide plate 294 is fixed on the surface of the threaded post 293.

[0032] The threaded post 293 is used to lock the guide post 291 in the desired position, while the guide plate 294 facilitates the application of rotational force to the threaded post 293.

[0033] Working principle: The shaft 12 is connected to the drive mechanism, which allows the shaft core 11 to rotate. The feeding section 14 is used to quickly and stably receive materials from the hopper. The melting and plasticizing section 15 compresses, shears, and rubs the material to achieve melting and plasticizing. The exhaust end facilitates the evaporation of moisture in the material. The pressure building and conveying section 17 establishes stable pressure and forces the uniformly plasticized melt through the die head mold to complete the shaping. When it is necessary to fix the workpiece 1 in the required position, first connect the connecting shaft 12 to the drive mechanism. With the setting of the connecting groove 23, the support shaft 13 is quickly inserted into the fixed plate 21. Then, a pushing force is applied to the guide post 291, and the connecting block 29 is displaced in the movable groove 28, causing the mounting plate 26 to move linearly. After the bearing 25 is locked outside the support shaft 13, a rotational force is applied to the guide plate 294, and the threaded post 293 rotates inside the support block 292. After the threaded post 293 passes through the guide post 291, the support shaft 13 can be quickly fixed in the required position.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A twin-screw structure for a twin-screw extruder, characterized in that, include: The machining part (1) and the mounting part (2) are provided on one side of the machining part (1); The processed part (1) includes a shaft core (11), a feeding section (14), a melting and plasticizing section (15), an exhaust section (16), and a pressure building conveying section (17). The feeding section (14), the melting and plasticizing section (15), the exhaust section (16), and the pressure building conveying section (17) are located outside the shaft core (11). The feeding section (14), the melting and plasticizing section (15), the exhaust section (16), and the pressure building conveying section (17) are distributed from one side to the other along the length direction of the shaft core (11). The feeding section (14) and the exhaust section (16) use large pitch elements, while the melting and plasticizing section (15) and the pressure building conveying section (17) use small pitch elements.

2. The twin-screw structure of a twin-screw extruder according to claim 1, characterized in that, A connecting shaft (12) is provided on the side of the shaft core (11) near the feeding section (14), and a support shaft (13) is provided on the side of the shaft core (11) near the mounting part (2).

3. The twin-screw structure of a twin-screw extruder according to claim 1, characterized in that, The mounting component (2) includes a fixing plate (21), a support column (22), a connecting groove (23) and a guide groove (24). The support column (22) is fixed on the surfaces of both sides of the fixing plate (21), the connecting groove (23) is opened on both sides of the fixing plate (21), the support shaft (13) is located inside the connecting groove (23), and the guide groove (24) is opened in the middle of the fixing plate (21).

4. The twin-screw structure of a twin-screw extruder according to claim 3, characterized in that, The fixed plate (21) has a support plate (27) fixed on both sides of the end near the support column (22), and the support plate (27) has an movable groove (28) inside.

5. The twin-screw structure of a twin-screw extruder according to claim 4, characterized in that, The movable groove (28) is provided with a connecting block (29) inside. The upper surface of the connecting block (29) is fixed with a mounting plate (26). The surface of the mounting plate (26) is fixed with a bearing (25). The support shaft (13) is located inside the bearing (25).

6. The twin-screw structure of a twin-screw extruder according to claim 5, characterized in that, The outer surface of the connecting block (29) is fixed with a guide post (291), which is connected through the interior of the support plate (27). The surface of the support plate (27) away from the mounting plate (26) is fixed with a support block (292).

7. The twin-screw structure of a twin-screw extruder according to claim 6, characterized in that, The internal threads of the support block (292) and guide post (291) are connected to a threaded post (293), and a guide plate (294) is fixed on the surface of the threaded post (293).

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