Screw extruder for chinlon production

Abstract

The invention discloses a spiral extruder for chinlon production, and belongs to the technical field of chinlon production, the spiral extruder comprises an outer machine frame, an extrusion inner cylinder is mounted in the outer machine frame, a first rotating shaft is arranged at the slightly eccentric position in the extrusion inner cylinder, and a first extrusion spiral is fixedly mounted outside the first rotating shaft; a driving mechanism for driving the first rotating shaft is arranged on one side of the extrusion inner cylinder, and a feeding hopper for feeding is mounted on the extrusion inner cylinder; the first rotating shaft which is slightly eccentrically arranged in the extrusion inner cylinder and the first extrusion screw which is fixed outside the first rotating shaft are driven by the driving mechanism to eccentrically rotate, compared with a traditional rotating shaft which is concentrically arranged, the structure can generate radial disturbance to materials, the radial disturbance strengthens the mixing effect of the materials in the extrusion inner cylinder, and the mixing effect of the materials in the extrusion inner cylinder is improved. The components in a chinlon system added with a plurality of auxiliaries or reinforcing materials can be more uniformly dispersed, so that key indexes such as mechanical properties and appearance quality of chinlon products are effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyamide production, and particularly relates to a spiral extruder for polyamide production. Background Art

[0002] In the field of polyamide production, the spiral extruder is one of the key equipment for realizing the processing and forming of polyamide, and its performance plays a decisive role in the quality and production efficiency of polyamide products.

[0003] In traditional extruders, most of the internal rotating shafts are concentrically arranged. During the material conveying process, the material mainly moves axially, with less radial disturbance, resulting in uneven mixing of the material. Especially for polyamide systems with multiple additives or reinforcing materials, it is difficult to ensure the uniform dispersion of each component in the material, which in turn affects key indicators such as the mechanical properties and appearance quality of polyamide products. At the same time, the concentric structure makes the material prone to local accumulation and uneven flow velocity in the extrusion inner cylinder, not only reducing the production efficiency, but also possibly causing the material to stay in the machine for too long, leading to adverse phenomena such as thermal degradation and damaging the quality of polyamide.

[0004] To avoid the above technical problems, it is necessary to provide a spiral extruder for polyamide production to overcome the defects in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a spiral extruder for polyamide production to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A spiral extruder for polyamide production, including an outer frame, an extrusion inner cylinder is installed inside the outer frame, a first rotating shaft is arranged at a slightly eccentric position inside the extrusion inner cylinder, a first extrusion screw is fixedly installed outside the first rotating shaft, a driving mechanism for driving the first rotating shaft is arranged on one side of the extrusion inner cylinder, a feed hopper for feeding is installed on the extrusion inner cylinder, and an extrusion plate is arranged on one side of the extrusion inner cylinder; Driven by the driving mechanism, the first extrusion screw on the first rotating shaft will rotate eccentrically inside the extrusion inner cylinder, generating radial disturbance to the material and strengthening the material mixing.

[0007] As a preferred implementation, the driving mechanism includes a motor installed on one side of the extrusion inner cylinder, the output shaft of the motor is rotationally connected with an eccentric gear through an L-shaped connecting shaft, and a first disc is rotationally connected to one side of the extrusion inner cylinder.

[0008] As a preferred implementation, the second disc is eccentrically and rotationally connected inside the first disc, one side of the second disc is fixedly connected to the first rotating shaft, and the other side is fixedly connected to the eccentric gear.

[0009] As a preferred embodiment, a toothed ring is fixedly installed on one side of the extrusion inner cylinder through a connecting block, and the eccentric gear is eccentrically meshed in the toothed ring.

[0010] As a preferred embodiment, the first disc, the toothed ring and the extrusion inner cylinder are in a concentric spatial state, and the second disc, the eccentric gear and the first rotating shaft are in a concentric spatial state; Driven by the motor, the eccentric gear is driven by the L-shaped connecting shaft to rotate eccentrically in a circular shape within the toothed ring, and at the same time, it is driven to rotate self by meshing, so as to realize the eccentric radial disturbance of the first extrusion screw and also perform self-rotating transportation.

[0011] As a preferred embodiment, one end of the first rotating shaft is eccentrically rotatably connected to a second rotating shaft through a sealed bearing, and a second extrusion screw located inside the extrusion inner cylinder is installed on the second rotating shaft.

[0012] As a preferred embodiment, the second rotating shaft and the extrusion inner cylinder are in a concentric spatial state; When the first rotating shaft rotates, it drives the second rotating shaft and the second extrusion screw to rotate through eccentric circular rotation inside the extrusion inner cylinder, so that the material can be stably extruded and transported by the second extrusion screw after experiencing the disturbance transportation of the first extrusion screw.

[0013] As a preferred embodiment, a first heating device and a second heating device for heating the inside thereof are respectively provided outside the extrusion inner cylinder.

[0014] As a preferred embodiment, the heating temperature of the second heating device located at the second extrusion screw is lower than that of the first heating device located at the first extrusion screw.

[0015] As a preferred embodiment, the second extrusion screw is provided with a plurality of through holes; The second extrusion screw can facilitate the receiving of the conveying pressure during the conveying of the first extrusion screw through the through holes, and improve the synergy of the extrusion conveying of the first extrusion screw and the second extrusion screw.

[0016] Compared with the prior art, the beneficial effects of the present invention are: The first rotating shaft with a slightly eccentric setting inside the extrusion inner cylinder of the present invention and the first extrusion screw fixed to its outside rotate eccentrically under the drive of the drive mechanism. Compared with the rotating shaft with a traditional concentric setting, this structure can generate a radial disturbance to the material. This radial disturbance strengthens the mixing effect of the material inside the extrusion inner cylinder, enabling the components in the nylon system with various additives or reinforcing materials to be more evenly dispersed, thereby effectively improving key indicators such as the mechanical properties and appearance quality of nylon products. At the same time, this structure improves the flow state of the material inside the extrusion inner cylinder, reduces local accumulation and uneven flow velocity, improves production efficiency, and avoids problems such as thermal degradation that damage the quality of nylon caused by the material staying for too long.

[0017] The motor of the present invention drives the eccentric gear to rotate eccentrically and self-rotate inside the toothed ring through the L-shaped connecting shaft, and then makes the first rotating shaft and the first extrusion screw connected to the eccentric gear rotate eccentrically. The first extrusion screw not only generates an annular radial disturbance inside the extrusion inner cylinder but also self-transports the material, enabling the components in the nylon system to be fully blended and improving the quality of the product. When the first rotating shaft rotates eccentrically, it drives the second rotating shaft and the second extrusion screw connected to it through the sealed bearing to rotate. The second extrusion screw is concentric with the extrusion inner cylinder and can stably extrude and transport the material after the material is disturbed and mixed by the first extrusion screw, ensuring that the material can be evenly and efficiently extruded from the extrusion plate, improving production efficiency while ensuring the quality stability of nylon products.

[0018] The first extrusion screw on the first rotating shaft of the present invention realizes the initial transportation and disturbance mixing of the material through self-rotation, while the second extrusion screw is driven by the eccentric annular rotation of the first extrusion screw, and its rotation speed is significantly lower than that of the first extrusion screw. This speed difference and temperature gradient design form a synergistic effect: the temperature of the second heating device located at the second extrusion screw is lower than that of the first heating device, so that the material is gradually cooled when entering the second extrusion screw, optimizing the orientation and crystallization of molecular chains; At the same time, the high-speed transportation of the first extrusion screw and the low-speed operation of the second extrusion screw form a pressure difference. The through holes on the second extrusion screw serve as pressure transmission channels, penetrating the extrusion pressure generated by the first extrusion screw to the rear section, effectively improving the pressure synergy of the two extrusion transports and avoiding material blockage. In addition, the material can also pass through the through holes and achieve relative fusion with the material at the gap formed by the eccentric rotation of the first extrusion screw, making the material activity at the junction of the first extrusion screw and the second extrusion screw more intense, which not only helps the repeated mixing and heating of the front-end material but also enables the material entering the second extrusion screw to have a higher mixing quality, thereby achieving a better extrusion effect, ensuring the quality of nylon products, and significantly improving the quality stability and production efficiency of nylon products. Description of the Drawings

[0019] Figure 1Schematic diagram of the three-dimensional structure of the present invention; Figure 2 Schematic diagram of the sectional three-dimensional structure of the present invention; Figure 3 Schematic diagram of the partial three-dimensional structure of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the L-shaped connecting shaft of the present invention; Figure 5 For the present invention Figure 2 Schematic diagram of the enlarged three-dimensional structure at position A in; Figure 6 Schematic diagram of the sectional three-dimensional structure of the first extrusion screw of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the first extrusion screw of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged three-dimensional structure at position B in; Figure 9 Schematic diagram of the sectional three-dimensional structure of the second extrusion screw of the present invention; Figure 10 Schematic diagram of the three-dimensional structure of the second extrusion screw of the present invention.

[0020] In the figure: 1, outer machine frame; 2, extrusion inner cylinder; 3, first rotating shaft; 4, first extrusion screw; 5, driving mechanism; 6, feed hopper; 7, extrusion plate; 8, motor; 9, eccentric gear; 10, L-shaped connecting shaft; 11, first disc; 12, second disc; 13, connecting block; 14, toothed ring; 15, sealed bearing; 16, second rotating shaft; 17, second extrusion screw; 18, first heating device; 19, through hole; 20, second heating device. Detailed implementation manners

[0021] The following further describes the present invention in conjunction with embodiments.

[0022] The following embodiments are used to illustrate the present invention, but cannot be used to limit the protection scope of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention all belong to the scope required to be protected by the present invention.

[0023] Please refer to Figure 1-10 , the present invention provides a spiral extruder for nylon production, including an outer machine frame 1, an extrusion inner cylinder 2 is installed inside the outer machine frame 1, a first rotating shaft 3 is arranged at a slightly eccentric position inside the extrusion inner cylinder 2, a first extrusion screw 4 is fixedly installed outside the first rotating shaft 3, a driving mechanism 5 for driving the first rotating shaft 3 is arranged on one side of the extrusion inner cylinder 2, a feed hopper 6 for feeding is installed on the extrusion inner cylinder 2, and an extrusion plate 7 is arranged on one side of the extrusion inner cylinder 2; Driven by the drive mechanism 5, the first extrusion screw 4 on the first rotating shaft 3 will rotate eccentrically in the extrusion inner cylinder 2, generating radial disturbance to the material and strengthening the material mixing.

[0024] The first rotating shaft 3 with a slightly eccentric setting in the extrusion inner cylinder 2 and the first extrusion screw 4 fixed outside it rotate eccentrically under the drive of the drive mechanism 5. Compared with the traditional concentrically arranged rotating shaft, this structure can generate radial disturbance to the material. This radial disturbance strengthens the mixing effect of the material in the extrusion inner cylinder 2, enabling the components in the nylon system with various additives or reinforcing materials to be more evenly dispersed. Thus, the key indicators such as the mechanical properties and appearance quality of the nylon products are effectively improved. At the same time, this structure improves the flow state of the material in the extrusion inner cylinder 2, reduces the local accumulation and uneven flow velocity, improves the production efficiency, and avoids problems such as thermal degradation that damage the quality of nylon due to the excessive residence time of the material.

[0025] As Figure 3 and Figure 5 shown, the drive mechanism 5 includes a motor 8 installed on one side of the extrusion inner cylinder 2. The output shaft of the motor 8 is rotationally connected with an eccentric gear 9 through an L-shaped connecting shaft 10. One side of the extrusion inner cylinder 2 is rotationally connected with a first disc 11.

[0026] As Figure 4 shown, the inner part of the first disc 11 is rotationally connected with a second disc 12 eccentrically. One side of the second disc 12 is fixedly connected with the first rotating shaft 3, and the other side is fixedly connected with the eccentric gear 9.

[0027] As Figure 4 shown, one side of the extrusion inner cylinder 2 is fixedly installed with a toothed ring 14 through a connecting block 13. The eccentric gear 9 is eccentrically meshed in the toothed ring 14.

[0028] As Figure 4 shown, the first disc 11, the toothed ring 14 and the extrusion inner cylinder 2 are in a concentric spatial state, and the second disc 12, the eccentric gear 9 and the first rotating shaft 3 are in a concentric spatial state; Driven by the motor 8, the eccentric gear 9 is driven to rotate eccentrically in a circular motion in the toothed ring 14 through the L-shaped connecting shaft 10, and at the same time, it is driven to rotate self - synchronously through meshing, realizing the circular radial disturbance of the first extrusion screw 4 and also enabling self - synchronous conveying.

[0029] As Figure 7 shown, one end of the first rotating shaft 3 is rotationally connected with a second rotating shaft 16 through a sealed bearing 15 eccentrically. A second extrusion screw 17 located in the extrusion inner cylinder 2 is installed on the second rotating shaft 16.

[0030] As Figures 7 to 9As shown, the second rotating shaft 16 and the extrusion inner cylinder 2 are in a concentric space state; When the first rotating shaft 3 rotates, it drives the second rotating shaft 16 and the second extrusion screw 17 to rotate through eccentric circular rotation in the extrusion inner cylinder 2, so that the material can be stably extruded and conveyed in the second extrusion screw 17 after being disturbed and conveyed by the first extrusion screw 4.

[0031] The motor 8 drives the eccentric gear 9 to rotate eccentrically and self-rotate in the gear ring 14 through the L-shaped connecting shaft 10, thereby causing the first rotating shaft 3 connected to the eccentric gear 9 and the first extrusion screw 4 thereon to rotate eccentrically. The first extrusion screw 4 not only generates annular radial disturbance in the extrusion inner cylinder 2, but also self-rotates to transport the material, so that the various components in the nylon system are fully blended and the product quality is improved. When the first rotating shaft 3 rotates eccentrically, it drives the second rotating shaft 16 and the second extrusion screw 17 connected thereto through the sealed bearing 15 to rotate. The second extrusion screw 17 is concentric with the extrusion inner cylinder 2. After the material is disturbed and mixed by the first extrusion screw 4, it can be stably extruded and transported, ensuring that the material can be extruded from the extrusion plate 7 evenly and efficiently, while improving production efficiency, ensuring the quality stability of nylon products. like Figure 2 As shown, the outside of the extrusion inner cylinder 2 is respectively provided with a first heating device 18 and a second heating device 20 for heating the inside thereof.

[0032] like Figure 2 As shown, the heating temperature of the second heating device 20 located at the second extrusion screw 17 is lower than that of the first heating device 18 located at the first extrusion screw 4 .

[0033] like Figure 10 As shown, the second extrusion screw 17 is provided with a plurality of through holes 19; The second extrusion screw 17 can easily receive the conveying pressure of the first extrusion screw 4 through the through hole 19, thereby improving the coordination of the extrusion conveying between the first extrusion screw 4 and the second extrusion screw 17.

[0034] The first extrusion screw 4 on the first rotating shaft 3 realizes the initial conveying and disturbance mixing of the material by self-rotation, while the second extrusion screw 17 is driven by the eccentric annular rotation of the first extrusion screw 4, and its rotation speed is significantly lower than that of the first extrusion screw 4. This speed difference and the temperature gradient design form a synergistic effect: the temperature of the second heating device 20 located at the second extrusion screw 17 is lower than that of the first heating device 18, so that the material is gradually cooled when entering the second extrusion screw 17, optimizing the orientation and crystallization of the molecular chain; Meanwhile, the high-speed conveying of the first extrusion screw 4 and the low-speed operation of the second extrusion screw 17 form a pressure difference. The through holes 19 on the second extrusion screw 17 serve as pressure transmission channels, penetrating the extrusion force generated by the first extrusion screw 4 to the rear section, effectively improving the pressure synergy of the extrusion and conveying of the two, and avoiding material blockage. In addition, the material can also pass through the through holes 19 and achieve relative fusion with the material at the gap formed by the eccentric rotation of the first extrusion screw 4, intensifying the movement of the material at the junction of the first extrusion screw 4 and the second extrusion screw 17. This not only helps with the repeated mixing and heating of the front-end material but also enables the material entering the second extrusion screw 17 to have a higher mixing quality, thereby achieving a better extrusion effect, ensuring the quality of the nylon product, and significantly enhancing the quality stability and production efficiency of the nylon product.

[0035] The working principle and usage process of the present invention are as follows: First, turn on the motor 8. The output shaft of the motor 8 drives the eccentric gear 9 through the L-shaped connecting shaft 10. The eccentric gear 9 rotates eccentrically and self-rotates within the toothed ring 14, driving the connected second disc 12, and further causing the first rotating shaft 3 and the first extrusion screw 4 to rotate eccentrically within the extrusion inner cylinder 2, generating a strong radial disturbance to the material entering from the feed hopper 6 and achieving efficient mixing. Meanwhile, the first heating device 18 performs high-temperature heating on the area where the material in the front section of the extrusion inner cylinder 2 is located to promote material plasticization. As the material is conveyed to the rear section by the first extrusion screw 4, the second heating device 20 moderately cools the material at a relatively low temperature to optimize the material state. During the conveying process, the eccentric rotation of the first rotating shaft 3 drives the second rotating shaft 16 and the second extrusion screw 17 to rotate. The high-speed conveying of the first extrusion screw 4 and the low-speed operation of the second extrusion screw 17 form a pressure difference. The through holes 19 on the second extrusion screw 17 receive the conveying pressure of the first extrusion screw 4, ensuring the coordination of the front and rear section extrusion and conveying. The material achieves blending through the through holes 19 and the eccentricity of the first extrusion screw 4, and finally is stably extruded through the extrusion plate 7 to obtain high-quality nylon products.

[0036] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nylon production screw extruder, comprising an outer frame (1), wherein an extrusion inner cylinder (2) is installed in the outer frame (1), characterized in that: A first rotating shaft (3) is arranged at a slightly eccentric position inside the extrusion inner cylinder (2); a first extrusion screw (4) is fixedly mounted outside the first rotating shaft (3); a driving mechanism (5) for driving the first rotating shaft (3) is arranged on one side of the extrusion inner cylinder (2); a feeding hopper (6) for feeding materials is mounted on the extrusion inner cylinder (2); and an extrusion plate (7) is arranged on one side of the extrusion inner cylinder (2); Driven by the driving mechanism (5), the first extrusion screw (4) on the first rotating shaft (3) is driven to rotate eccentrically in the extrusion inner cylinder (2), thereby generating radial disturbance to the material and enhancing the mixing of the material.

2. A nylon production screw extruder according to claim 1, characterized in that: The driving mechanism (5) comprises a motor (8) mounted on one side of the extrusion inner cylinder (2); an output shaft of the motor (8) is rotatably connected to an eccentric gear (9) via an L-shaped connecting shaft (10); and one side of the extrusion inner cylinder (2) is rotatably connected to a first disc (11).

3. A nylon production screw extruder according to claim 2, characterized in that: A second disc (12) is eccentrically rotatably connected inside the first disc (11); one side of the second disc (12) is fixedly connected to the first rotating shaft (3), and the other side of the second disc (12) is fixedly connected to the eccentric gear (9).

4. A nylon production screw extruder according to claim 3, characterized in that: A gear ring (14) is fixedly mounted on one side of the extrusion inner cylinder (2) via a connecting block (13), and the eccentric gear (9) is eccentrically meshed in the gear ring (14).

5. A nylon production screw extruder according to claim 4, characterized in that: The first disc (11), the gear ring (14) and the extrusion inner cylinder (2) are in a spatial state of concentric circles, and the second disc (12), the eccentric gear (9) and the first rotating shaft (3) are in a spatial state of concentric circles; Driven by the motor (8), the eccentric gear (9) is driven to rotate in an eccentric annular manner within the gear ring (14) through the L-shaped connecting shaft (10), and is simultaneously driven to rotate on its own by meshing, thereby achieving an annular radial disturbance of the first extrusion screw (4) and performing self-rotation transportation.

6. A nylon production screw extruder according to claim 1, characterized in that: One end of the first rotating shaft (3) is eccentrically rotatably connected to a second rotating shaft (16) via a sealed bearing (15), and a second extrusion screw (17) located in the extrusion inner cylinder (2) is mounted on the second rotating shaft (16).

7. A nylon production screw extruder according to claim 6, characterized in that: The second rotating shaft (16) and the extrusion inner cylinder (2) are in a concentric circle spatial state; When the first rotating shaft (3) rotates, it drives the second rotating shaft (16) and the second extrusion screw (17) to rotate through eccentric annular rotation in the extrusion inner cylinder (2), so that the material can be stably extruded and conveyed by the second extrusion screw (17) after being disturbed by the first extrusion screw (4).

8. The nylon production screw extruder according to claim 1, characterized in that: The outside of the extrusion inner cylinder (2) is respectively provided with a first heating device (18) and a second heating device (20) for heating the inside thereof.

9. A nylon production screw extruder according to claim 8, characterized in that: The heating temperature of the second heating device (20) located at the second extrusion screw (17) is lower than that of the first heating device (18) located at the first extrusion screw (4).

10. A nylon production screw extruder according to claim 6, characterized in that: The second extrusion screw (17) is provided with a plurality of through holes (19); The second extrusion screw (17) can easily receive the conveying pressure of the first extrusion screw (4) during conveying through the through hole (19), thereby improving the coordination of extrusion conveying between the first extrusion screw (4) and the second extrusion screw (17).

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