PET extrusion screw

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) extrusion screw which comprises a central main shaft, the central main shaft is sleeved with the multiple extrusion outer barrels, spiral conveying blades are fixed to the outer walls of the extrusion outer barrels, a first generatrix is taken on the outer walls of the extrusion outer barrels, and the first ends of the conveying blades are spirally arranged in an obliquely-upward or obliquely-downward mode with the first end of the first generatrix as the starting point; the second end of the conveying blade is connected to the second end of the first bus obliquely upwards or obliquely downwards. The screw pitches of the conveying blades of different extrusion outer barrels are the same or different, and the second end of the conveying blade of the previous extrusion outer barrel is connected with the first end of the conveying blade of the next extrusion outer barrel; and a limiting structure is arranged between the outer wall of the central main shaft and the inner wall of the extrusion outer cylinder, so that the extrusion outer cylinder rotates along with the central main shaft. Compared with the prior art, the extrusion device has the advantages that the structure is simple, and different extrusion amounts can be selected under the condition of the same rotating speed according to the properties of different PET materials.

Description

Technical Field

[0001] This utility model belongs to the field of PET production technology, and specifically relates to a PET extrusion screw. Background Technology

[0002] Extruders are used for the extrusion of polymer materials. During extrusion, the temperature drops, which can cause PET materials to solidify. Therefore, heat preservation and heating devices are often required. Extruders include extrusion screws, but existing screws have a uniform pitch, which cannot meet the requirements of the extrusion process. For example, the screw pitch at the feed point of the extruder should be larger to obtain more space, while the screw pitch at the outlet can be smaller to increase the extrusion speed. Therefore, obtaining a PET extrusion screw is very important. Utility Model Content

[0003] To solve at least one of the above-mentioned technical problems, this utility model provides a PET extrusion screw, comprising:

[0004] Central spindle;

[0005] Several extrusion outer cylinders are set on the central main shaft. Spiral conveying blades are fixed on the outer wall of the extrusion outer cylinders. A first generatrix is ​​taken on the outer wall of the extrusion outer cylinders. The first end of the conveying blade is spirally arranged upward or downward from the first end of the first generatrix. The second end of the conveying blade is connected to the second end of the first generatrix upward or downward.

[0006] The pitch of the conveyor blades of different extrusion outer cylinders may be the same or different, and the second end of the conveyor blade of the previous extrusion outer cylinder is connected to the first end of the conveyor blade of the next extrusion outer cylinder.

[0007] A limiting structure is provided between the outer wall of the central spindle and the inner wall of the extrusion outer cylinder to allow the extrusion outer cylinder to rotate with the central spindle.

[0008] Through the above technical solution, this utility model can select the pitch of the conveyor blade according to the different materials, based on the production of PET materials with different hardness, or other parameters besides hardness, and by sequentially setting extrusion outer cylinders with different conveyor blade pitches, thereby increasing uniform mixing and stability, and obtaining different extrusion speeds according to the production of different materials.

[0009] The limiting structure includes at least one limiting protrusion fixed to the outer wall of the central spindle and a limiting groove formed on the inner wall of the extrusion outer cylinder that mates with the limiting protrusion.

[0010] Through the above technical solution, the setting of the limiting protrusion and the limiting groove can achieve the limiting and prevent relative rotation between the central main shaft and the extrusion outer cylinder.

[0011] A retaining ring groove is provided on the outer wall of the central spindle, and a retaining ring is installed in the retaining ring groove. The retaining ring limits the side wall of the assembled extrusion outer cylinder. After selecting to install the extrusion outer cylinder, the retaining ring can be installed to achieve the limiting of the extrusion outer cylinder.

[0012] The tail end and / or head end of the central spindle are formed at the connection part of the extruder connection. The tail end of the central spindle extends with a connecting column. A drive gear is fixed on the outer wall of the connecting column. It also includes an external drive motor. A drive gear that meshes with the drive gear is fixed on the output shaft of the drive motor. The central spindle is driven to rotate by the drive motor.

[0013] A heating channel is provided at the center of the central spindle, and a heating wire is fixed to the inner wall of the heating channel, or hot water is circulated into the heating channel. Several notches are provided on the conveying blades, which can change the flow direction of the internal fluid and improve the conveying capacity.

[0014] Compared with the prior art, the advantages of this utility model are: the utility model has a simple structure and can select different extrusion amounts at the same rotation speed according to the properties of different PET materials. Attached Figure Description

[0015] Figure 1 This is a side view of the extrusion outer cylinder of this utility model;

[0016] Figure 2 This is a two-side view of the extrusion outer cylinder of this utility model;

[0017] Figure 3 This is a side view of the spliced ​​outer cylinder of this utility model;

[0018] Figure 4 This is a side cross-sectional view of the present invention;

[0019] Figure 5 for Figure 4 A schematic diagram of the cross-section at point AA;

[0020] Figure label:

[0021] 1. Central spindle; 2. Extrusion outer cylinder; 3. Conveyor blade; 4. First generatrix; 5. Limiting protrusion; 6. Limiting groove; 7. Snap ring groove; 8. Snap ring; 9. Connecting column; 10. Drive gear; 11. Heating channel; 12. Notch; 13. Limiting ring; 14. Annular groove. Detailed Implementation

[0022] To enable those skilled in the art to better understand this utility model and to more clearly define the scope of protection claimed by this utility model, the present utility model is described in detail below with reference to certain specific embodiments. It should be noted that the following are only some specific embodiments of the present utility model concept, and are only a part of the embodiments of this utility model. The specific and direct description of related structures is only for the convenience of understanding this utility model, and the specific features do not necessarily or directly limit the scope of implementation of this utility model.

[0023] Referring to the accompanying drawings, this utility model adopts the following technical solution: This utility model provides a PET extrusion screw, comprising:

[0024] Central spindle 1;

[0025] Several extrusion outer cylinders 2 are set on the central main shaft 1. A spirally arranged conveying blade 3 is fixed on the outer wall of the extrusion outer cylinder 2. A first generatrix 4 is taken on the outer wall of the extrusion outer cylinder 2. The first end of the conveying blade 3 is spirally arranged diagonally upward or downward from the first end of the first generatrix 4. The second end of the conveying blade 3 is diagonally upward or downward connected to the second end of the first generatrix 4.

[0026] The pitch of the conveying blades 3 of different extrusion outer cylinders 2 may be the same or different, and the second end of the conveying blade 3 of the previous extrusion outer cylinder 2 is connected to the first end of the conveying blade 3 of the next extrusion outer cylinder 2.

[0027] A limiting structure is provided between the outer wall of the central spindle 1 and the inner wall of the extrusion outer cylinder 2 so that the extrusion outer cylinder 2 rotates with the central spindle 1.

[0028] Through the above technical solution, this utility model can select the pitch of the conveyor blade 3 according to the different materials, based on the production of PET materials with different hardness, or other parameters besides hardness, and by sequentially setting different pitches of the conveyor blade 3 in the extrusion outer cylinder 2, thereby increasing uniform mixing and stability, and obtaining different extrusion speeds according to the production of different materials.

[0029] The limiting structure includes at least one limiting protrusion 5 fixed to the outer wall of the central spindle 1 and a limiting groove 6 formed on the inner wall of the extrusion outer cylinder 2 that cooperates with the limiting protrusion 5.

[0030] Through the above technical solution, the setting of the limiting protrusion 5 and the limiting groove 6 can achieve the limiting and prevent relative rotation between the central main shaft 1 and the extrusion outer cylinder 2.

[0031] A retaining ring groove 7 is provided on the outer wall of the central spindle 1, and a retaining ring 8 is installed in the retaining ring groove 7. The retaining ring 8 limits the side wall of the assembled extrusion outer cylinder 2. After selecting to install the extrusion outer cylinder 2, the retaining ring 8 can be installed to achieve the limiting of the extrusion outer cylinder 2.

[0032] The tail end and / or head end of the central spindle 1 are formed at the connection part of the extruder connection. The tail end of the central spindle 1 extends with a connecting post 9. A drive gear 10 is fixed on the outer wall of the connecting post 9. It also includes an external drive motor. A drive gear that meshes with the drive gear 10 is fixed on the output shaft of the drive motor. The central spindle 1 is driven to rotate by the drive motor.

[0033] A heating channel 11 is provided at the center of the central main shaft 1. A heating wire is fixed on the inner wall of the heating channel 11, or hot water is introduced into the heating channel 11. Several notches 12 are provided on the conveying blade 3. The notches 12 can change the flow direction of the internal fluid and improve the conveying capacity.

[0034] Alternatively, a notch 12 may be formed between the conveyor blades 3 of two adjacent extrusion outer cylinders 2.

[0035] Compared with the prior art, the advantages of this utility model are: the utility model has a simple structure and can select different extrusion amounts at the same rotation speed according to the properties of different PET materials.

[0036] A limiting ring 13 can be integrally formed at the head end of the central spindle 1, and an annular groove 14 that cooperates with the limiting ring 13 is provided on the inner wall of each extrusion outer cylinder 2.

[0037] The extrusion screw of this invention uses a conventional installation method, namely, it is rotatably connected to the extrusion cavity of the extruder, and then the drive motor drives the drive gear 10 to rotate, thereby realizing the rotation of the extrusion screw. The drive motor can be the drive motor of the extruder, and the gear drive method can also be a belt drive method.

[0038] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0039] In the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A PET extrusion screw characterized by: include: Central spindle (1); Several extrusion outer cylinders (2) are set on the central main shaft (1). The outer wall of the extrusion outer cylinder (2) is fixed with a spirally arranged conveyor blade (3). A first generatrix (4) is taken on the outer wall of the extrusion outer cylinder (2). The first end of the conveyor blade (3) is spirally arranged upward or downward from the first end of the first generatrix (4). The second end of the conveyor blade (3) is connected to the second end of the first generatrix (4) upward or downward. The pitch of the conveyor blades (3) of different extrusion outer cylinders (2) is the same or different, and the second end of the conveyor blade (3) of the previous extrusion outer cylinder (2) is connected to the first end of the conveyor blade (3) of the next extrusion outer cylinder (2); A limiting structure is provided between the outer wall of the central spindle (1) and the inner wall of the extrusion outer cylinder (2) so that the extrusion outer cylinder (2) rotates with the central spindle (1).

2. The PET extrusion screw of claim 1, wherein: The limiting structure includes at least one limiting protrusion (5) fixed to the outer wall of the central spindle (1) and a limiting groove (6) formed on the inner wall of the extrusion outer cylinder (2) that cooperates with the limiting protrusion (5).

3. The PET extrusion screw of claim 1, wherein: A retaining ring groove (7) is provided on the outer wall of the central spindle (1), and a retaining ring (8) is installed in the retaining ring groove (7). The retaining ring (8) limits the side wall of the assembled extrusion outer cylinder (2).

4. The PET extrusion screw of claim 1, wherein: The tail end and / or head end of the central spindle (1) are formed in the connecting part of the extruder connection. The tail end of the central spindle (1) extends with a connecting post (9). A drive gear (10) is fixed on the outer wall of the connecting post (9). It also includes an external drive motor. A drive gear that meshes with the drive gear (10) is fixed on the output shaft of the drive motor. The central spindle (1) is driven to rotate by the drive motor.

5. The PET extrusion screw of claim 1, wherein: A heating channel (11) is provided in the center of the central spindle (1), and a heating wire is fixed on the inner wall of the heating channel (11), or hot water is introduced into the heating channel (11).

6. The PET extrusion screw of claim 1, wherein: The conveyor blade (3) has several notches (12).

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