Mixing device of plastic extruder

Abstract

The invention relates to the technical field of master batch production equipment, in particular to a plastic extruder mixing device, which is used between the downstream of at least two parallel extruders and the upstream of a final cooling device, and is sequentially provided with a primary cooling hardening device, a splitting device, a first heating device and a hemp flower twisting device from the upstream to the downstream, the primary cooling hardening device can preliminarily harden the surface layers of plastic strips extruded by the multiple extruders, the splitting device and the hemp flower twisting device can twist the multiple plastic strips into one twisted strip, and the first heating device can soften the plastic strips between the splitting device and the hemp flower twisting device. According to the scheme, a plurality of plastic strips are subjected to controlled cooling, guiding, re-softening and twisting processes before and after being mixed, so that the risks of adhesion and skin damage of the plastic strips in the subsequent conveying and mixing processes are reduced; and the fried dough twist is not easy to break in the fried dough twist twisting process, and fried dough twist strips with uniform structures can be formed more easily.

Description

Technical Field

[0001] This invention relates to the field of masterbatch production equipment technology, and more particularly to a plastic extruder blending device. Background Technology

[0002] In the raw materials of plastic masterbatch (also known as plastic color masterbatch, modified masterbatch, or plastic masterbatch), various types of additives are often used to improve the performance of plastics or to give them specific properties. For example, multi-functional plastic masterbatch with strong flame retardancy, corrosion resistance, and insulation can be used to prepare various plastic products.

[0003] Current technologies for preparing multi-performance masterbatches generally involve uniformly mixing various raw materials and additives, followed by extrusion using an extruder. This method has the following problems: because multiple raw materials need to be mixed uniformly, the homogeneity of the mixture determines the stability of the masterbatch quality. Each additional raw material or additive increases the difficulty of achieving uniform mixing exponentially, requiring increases in stirring speed and time to improve homogeneity. Therefore, the more types of raw materials there are, the greater the difficulty and precision requirements in the mixing process.

[0004] The applicant previously disclosed a plastic granule production process (publication number: CN119260978A), which involves breaking down the raw materials required for a multi-performance masterbatch into multiple single-performance raw materials and extruding them into plastic strips. These single-performance plastic strips are then bonded together to form a single multi-performance plastic strip. After cooling, the multi-performance plastic strip is granulated. This method results in a more uniform formulation and more stable quality multi-performance masterbatch. However, the blending process suffers from poor blending performance. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of poor blending effect during the blending process, and to propose a blending device for a plastic extruder.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A plastic extruder blending device is used between the downstream of at least two parallel extruders and the upstream of a final cooling device. The blending device is provided with a primary cooling and hardening device, a slitting device, a first heating device, and a twisting device in sequence from upstream to downstream. The primary cooling and hardening device can initially harden the surface layer of plastic strips extruded by multiple extruders. The slitting device and the twisting device can twist multiple plastic strips into a single twisted strip. The first heating device can soften the plastic strip between the slitting device and the twisting device.

[0008] The present invention proposes a plastic extruder blending device, which has the following advantages: By sequentially setting a primary cooling and hardening device, a slitting device, a first heating device, and a twisting device downstream of the extruder, multiple plastic strips undergo controlled cooling, guiding, re-softening, and twisting processes before and after blending, reducing the risk of plastic strips sticking together and surface damage during subsequent conveying and blending; and making it less prone to breakage during twisting, and more conducive to forming twisted strips with uniform structure. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the relationship between the various workstations in this invention;

[0010] Figure 2 This is a schematic diagram of the disk structure of the present invention;

[0011] Figure 3 This is a partial three-dimensional structural diagram of the twisting device of the present invention;

[0012] Figure 4 This is a partial front view schematic diagram of the twisting device of the present invention;

[0013] Figure 5 This is a schematic diagram of the tensioning device of the present invention.

[0014] In the diagram: 1. Extruder; 2. Primary cooling and hardening device; 3. Slitting device; 4. First heating device; 5. Twisting device; 6. Second heating device; 7. Stretching device; 8. Final cooling device; 9. Disc; 10. Gear ring; 11. Gear; 12. Rotary power; 13. Conical heat-conducting cylinder; 14. First heating wire; 15. Cylindrical heat-conducting cylinder; 16. Second heating wire; 17. Through hole; 18. First roller; 19. First semi-circular groove; 20. Second semi-circular groove; 21. Guide roller; 22. Annular groove; 23. Support shaft; 24. Clamping space; 25. Detailed Implementation

[0015] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0016] Reference Figures 1-5A plastic extruder blending device is used between the downstream of at least two parallel extruders 1 and the upstream of a final cooling device 8. The blending device is provided with a primary cooling and hardening device 2, a slitting device 3, a first heating device 4, and a twisting device 5 in sequence from upstream to downstream. The primary cooling and hardening device 2 can initially harden the surface of the plastic strips extruded by multiple extruders 1. The slitting device 3 and the twisting device 5 can twist multiple plastic strips into a single twisted strip. The first heating device 4 can soften the plastic strip between the slitting device 3 and the twisting device 5.

[0017] This device is installed between the downstream of at least two parallel extruders 1 and the upstream of the final cooling device 8. During operation, multiple extruders 1 simultaneously extrude plastic strips. The plastic strips first enter the primary cooling and hardening device 2, where they undergo preliminary cooling to form a hardened layer of a certain hardness on the surface. This ensures the plastic strip retains its internal plasticity while improving its surface wear resistance, anti-adhesion ability, and stability, preventing sliding friction between the plastic strip and the slitting device 3, which could lead to scratches and deformation. After primary cooling and hardening, the plastic strips enter the slitting device 3, which independently limits and guides the plastic strips from different extruders 1, maintaining a stable, parallel relative position and synchronously conveying them downstream. Subsequently, the plastic strips enter the first heating device 4, which slowly and uniformly reheats and softens them at a relatively low temperature. It is important to note that the heating temperature is based on not melting the surface of the plastic strip, thus improving the overall flexibility of the plastic strip and eliminating the surface rigidity caused by primary cooling and hardening. Multiple plastic strips in a soft state continue to enter the twisting device 5. Under the action of the twisting device 5, each plastic strip generates relative torsional motion while moving forward axially, thus being twisted into a whole twisted strip, completing the blending of multiple plastic strips.

[0018] This technical solution involves sequentially arranging a primary cooling and hardening device 2, a slitting device 3, a first heating device 4, and a twisting device 5 downstream of the extruder 1. This allows multiple plastic strips to undergo controlled cooling, guiding, re-softening, and twisting processes before and after blending. On one hand, the primary cooling and hardening device 2 pre-hardens the surface of the plastic strips, reducing the risk of adhesion and surface damage during subsequent conveying and blending. On the other hand, the slitting device 3 ensures that the multiple plastic strips maintain a stable spatial relationship before blending, avoiding mutual interference. The first heating device 4 re-softens the plastic strips, giving them good flexibility when entering the twisting device 5, making them less prone to breakage during twisting and more conducive to forming uniformly structured twisted strips.

[0019] It should be noted that the movement of the entire plastic strip is driven by the traction roller behind the final cooling device 8 and / or by the stretching device 7, as long as the entire twisted strip can move backward.

[0020] In one implementation, multiple extruders 1 are arranged side by side, with their heads aligned, as shown in the reference. Figure 1 Extruders are generally long and narrow, and by arranging them side by side, multiple extruders can be distributed in a rectangular pattern within the factory, which is more conducive to maximizing the effective use of factory space and avoiding waste of usable space.

[0021] Because the extruders 1 are arranged side-by-side, the distances between the multiple plastic strips and the slitting device 3 will be unequal. This is detrimental to the equal cooling effect of the multiple plastic strips. To solve this problem, the cooling time of the plastic strips located between the extruders 1 and the slitting device 3 within the primary cooling and hardening device 2 needs to be equal. The primary cooling and hardening device 2 is a first water-cooling pool, which is equipped with several rotatable guide rollers 22. At least some of the plastic strips can move downstream in an S-shape around the guide rollers 22. Plastic strips that are farther apart move in a straight line, while those that are closer move in a curved path, thus ensuring that all plastic strips have a basically equal cooling effect in the water pool.

[0022] As a heating method, the first heating device 4 includes a conical heat-conducting cylinder 13, with a first heating wire 14 disposed around the periphery of the conical heat-conducting cylinder 13. All the plastic strips pass through the conical heat-conducting cylinder 13 and enter the twisting device 5. The conical heat-conducting cylinder 13 is heated by the first heating wire 14, causing heat to radiate to the plastic strips. By controlling the heating power of the first heating wire 14, a slow heating rate is achieved, with the goal of not melting the surface of the plastic strips. In addition, the conical design ensures uniform heating of the plastic strips inside.

[0023] The slitting device 3 includes a disc 9, which is fixed to the frame. The disc 9 has several through holes 17 along its axis. During operation, each plastic strip passes through one through hole 17. The twisting device 5 includes a gear ring 10, which is meshed with a gear 11. The gear 11 is connected to a rotational power 12. The gear ring 10 has two first rollers 18. The first rollers 18 have a first semi-circular groove 19 on their circumference. There is a clamping space 25 between the two first rollers 18 to hold all the plastic strips. The first rollers 18 are rotatably connected to the gear ring 10 through a support shaft 24. Rotating the gear ring 10 can cause the two first rollers 18 to revolve around the axis of the gear ring 10. The revolving first rollers 18 can twist all the plastic strips into twisted strips.

[0024] During operation, multiple plastic strips from upstream pass through the disc 9 in the slitting device 3. Each plastic strip is inserted into a corresponding through hole 17 along the axial direction of the disc 9. Since the disc 9 is fixed to the frame, each through hole 17 provides independent limiting and guiding for the plastic strips, ensuring that the multiple plastic strips maintain a stable and separated relative position before entering the downstream station. The slitting plastic strips then enter the twisting device 5 simultaneously. The rotational power 12 drives the gear ring 10 to rotate via the gear 11. When the gear ring 10 rotates, it causes the two first rollers 18 mounted on it to revolve around the axis of the gear ring 10. Each plastic strip is located within the clamping space 25 formed between the two first rollers 18. The first semi-circular groove 19 on the periphery of the first roller 18 covers and limits the plastic strips. As the gear ring 10 continues to rotate, the first rollers 18, in their revolving state, cause the plastic strips within the clamping space 25 to twist relative to each other, so that the multiple plastic strips are gradually twisted together while moving axially, ultimately forming a single twisted strip.

[0025] This technical solution, by setting a fixed disc 9 and through holes 17 in the slitting device 3, ensures that each plastic strip is in an independent and controlled guiding state before entering the twisting device 5, effectively avoiding mutual interference between the plastic strips. Simultaneously, the twisting device 5 utilizes the transmission cooperation of the gear ring 10, gear 11, and rotating power 12 to continuously and uniformly twist the plastic strips during the revolution of the first roller 18. Combined with the structural constraints of the first semi-circular groove 19 and the clamping space 25, as well as the passive rotation of the first roller 18, the plastic strips are subjected to stable force and are less prone to slippage during the kneading process. This improves the uniformity and reliability of twisting multiple plastic strips into a twisted strip, enhances the kneading effect, and provides a stable structural foundation for the subsequent preparation of a uniformly mixed product.

[0026] The first roller 18 has an annular groove 23 on its circumference. The annular groove 23 helps to promote the twisting effect of the first roller 18 on the twisted strip, which facilitates the forming of the twisted strip.

[0027] The kneading device is located downstream of the twisting device 5 and is equipped with a second heating device 6 and a stretching device 7 in sequence. The second heating device 6 can melt the surface of the twisted strip, and the stretching device 7 can make the twisted strip thinner.

[0028] The second heating device 6 rapidly heats the twisted strip, softening it at a higher temperature relative to the first heating device 4. This allows the outer layer of the twisted strip to reach a molten state in a short time, while the interior maintains a certain degree of morphological stability. This increases the interfacial activation between the plastic strips without damaging the overall structure. The twisted strip treated by the second heating device 6 then enters the stretching device 7. The stretching device 7 applies compression and stretching to the molten outer layer of the twisted strip, causing it to gradually decrease in diameter while extending axially. Through this process, the twisted strip becomes thinner, and the plastic strips further bond together under the action of the molten surface, forming a tighter structure. The twisted strip then enters the final cooling device 8 for deep cooling and shaping, providing a stable strip shape for subsequent cutting processes.

[0029] The second heating device 6 rapidly heats the surface of the twisted strip, making its surface fusible and facilitating the re-bonding of the plastic strips, thereby significantly improving the bonding strength after blending. At the same time, the stretching device 7 extrudes and thins the twisted strip, reducing its overall size, which facilitates thorough and uniform cooling by the final cooling device 8 and improves the stability of the subsequent cutting process.

[0030] It should be noted that the stretching device 7 can be used in an active rotational extrusion manner or in a passive rotational extrusion manner.

[0031] It should be noted that the second heating device 6 heats the twisted strip to a degree that only melts or semi-melts the outer surface. In this molten state, the twisted strip maintains its continuous strip shape without dripping melt, and its shape undergoes only minor changes. By controlling the heating temperature and time, the internal structure of the twisted strip remains stable, ensuring sufficient adhesion between the individual plastic strips while preventing instability or transport difficulties caused by excessive melting.

[0032] The second heating device 6 includes a cylindrical heat-conducting cylinder 15, with a second heating wire 16 disposed around its periphery. During operation, the second heating wire 16 is energized and generates heat, which is uniformly conducted through the cylindrical heat-conducting cylinder 15 to its internal space, thereby circumferentially heating the twisted strip passing through the cylinder 15. This causes the outer surface of the twisted strip to rapidly heat up within a short stroke and reach a molten state. This heating method ensures uniform heating of the twisted strip, avoiding localized overheating or underheating. And / or, the stretching device 7 includes at least one set of pressure roller assemblies. The pressure roller assembly includes two second rollers 20 rotatably connected to the frame. Each second roller 20 has a second semi-circular groove 21, which forms a circular passage through the space. The diameter of the second semi-circular groove 21 is smaller than the diameter of the twisted strip upstream of the stretching device 7. The pressure roller assembly consists of two second rollers 20 rotatably connected to the frame. Each second roller 20 has a second semi-circular groove 21 on its circumference. The two semi-circular grooves 21 cooperate to form a circular through-space through which the twisted strip passes. Because the diameter of the second semi-circular groove 21 is smaller than the diameter of the twisted strip upstream of the stretching device 7, the twisted strip is compressed and stretched when passing through the pressure roller assembly, thus achieving overall thinning. The stretching device 7 can either actively rotate the second rollers 20 to apply a downstream traction force to the twisted strip, or, without a drive, have the twisted strip pulled downstream by a traction device behind the final cooling device 8, using the movement of the twisted strip to passively rotate the second rollers 20, thereby completing the extrusion and stretching process.

[0033] By setting up a second heating device 6 consisting of a cylindrical heat-conducting cylinder 15 and a second heating wire 16, the outer surface layer of the twisted strip quickly reaches a molten state before entering the stretching device 7, which is beneficial for the re-bonding of the plastic strips. At the same time, the stretching device 7 extrudes and stretches the twisted strip through the second roller 20 and the second semi-circular groove 21, reducing the overall diameter of the twisted strip and making its structure more compact. This not only improves the overall strength and stability of the twisted strip, but also facilitates the final cooling device 8 to fully cool the twisted strip and improves the stability of the subsequent strip cutting process.

[0034] The explanations of connection methods, directional terms, and other technical terms in this specification are for the purpose of facilitating understanding of the implementation methods and do not constitute a limitation of the present invention. The meanings of each term are as commonly understood by those skilled in the art, and connection relationships can also be achieved through intermediate components. "And / or" indicates any combination of the listed items. The scope of protection of the present invention is defined by the claims. Equivalent substitutions or modifications made within the scope of this invention based on the concept of the present invention should all fall within the scope of protection of the present invention.

Claims

1. A plastic extruder blending device, characterized in that, For use between the downstream of at least two parallel extruders (1) and the upstream of the final cooling device (8), the blending device is provided with a primary cooling and hardening device (2), a slitting device (3), a first heating device (4), and a twisting device (5) in sequence from upstream to downstream. The primary cooling and hardening device (2) can initially harden the surface of the plastic strips extruded by multiple extruders (1). The slitting device (3) and the twisting device (5) can twist multiple plastic strips into a single twisted strip. The first heating device (4) can soften the plastic strip between the slitting device (3) and the twisting device (5).

2. The plastic extruder blending device according to claim 1, characterized in that, Multiple extruders (1) are arranged side by side.

3. The plastic extruder blending device according to claim 2, characterized in that, The plastic strips located between the extruder (1) and the slitting device (3) have the same cooling time within the primary cooling and hardening device (2).

4. The plastic extruder blending device according to claim 3, characterized in that, The initial cooling and hardening device (2) is a first water-cooled pool, in which several rotatable guide rollers (22) are installed, and at least some of the plastic strips can move downstream in an S-shape around the guide rollers (22).

5. A plastic extruder blending device according to any one of claims 1-4, characterized in that, The slitting device (3) includes a disc (9), which is fixed to the frame. The disc (9) has several through holes (17) along its axial direction. During operation, each plastic strip passes through one through hole (17).

6. The plastic extruder blending device according to claim 5, characterized in that, The first heating device (4) includes a conical heat-conducting cylinder (13), and a first heating wire (14) is provided on the periphery of the conical heat-conducting cylinder (13). All the plastic strips pass through the conical heat-conducting cylinder (13) and enter the twisting device (5).

7. A plastic extruder blending device according to claim 5, characterized in that, The twisting device (5) includes a gear ring (10), which meshes with a gear (11). The gear (11) is connected to a rotational power (12). The gear ring (10) is provided with two first rollers (18). The first rollers (18) have a first semi-circular groove (19) on their periphery. There is a clamping space (25) between the two first rollers (18) for clamping all the plastic strips. The first rollers (18) are rotatably connected to the gear ring (10) through a support shaft (24). Rotating the gear ring (10) enables the two first rollers (18) to revolve around the axis of the gear ring (10). The revolving first rollers (18) can twist all the plastic strips into twisted strips.

8. The plastic extruder blending device according to claim 7, characterized in that, The first roller (18) has an annular groove (23) on its circumference.

9. A plastic extruder blending device according to any one of claims 1-4 and 6-8, characterized in that, The kneading device is located downstream of the twisting device (5) and is provided with a second heating device (6) and a stretching device (7). The second heating device (6) can melt the surface of the twisted strip, and the stretching device (7) can make the twisted strip thinner.

10. A plastic extruder blending device according to claim 9, characterized in that, The second heating device (6) includes a cylindrical heat-conducting cylinder (15), and a second heating wire (16) is provided on the periphery of the cylindrical heat-conducting cylinder (15). And / or, the stretching device (7) includes at least one set of pressure roller assemblies, the pressure roller assembly including two second rollers (20) rotatably connected to the frame, the second rollers (20) having a second semicircular groove (21), the second semicircular grooves (21) of the two second rollers (20) forming a circle passing through the space, the diameter of the second semicircular groove (21) being smaller than the diameter of the twisted strip upstream of the stretching device (7).

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