Underwater pellet cutting device for producing polylactic acid foamed particles

Abstract

The utility model belongs to polylactic acid foamed particle production equipment field, concretely relates to a polylactic acid foamed particle production underwater cutting device, including base, be installed with first tool rest and motor on the base, the left -hand end fixedly connected with water tank of first tool rest, be equipped with water inlet and water outlet on the water tank, water inlet and water tank in corresponding fixedly connected with the flow guide plate of cross section is few Chinese characters, be rotationally connected with the shaft that is connected with the motor in first tool rest, the fixedly connected with second tool rest in the water tank on the shaft, be installed with cutting knife on second tool rest, the through -hole that corresponds with second tool rest is penetrated in the flow guide plate, the left -hand end of water tank is equipped with the mounting sleeve, be installed with feed port and die head in the mounting sleeve, be penetrated with a plurality of discharge holes that correspond with cutting knife on the die head, be equipped with the feed channel and cloth trough that correspond with the discharge hole in the feed port. The utility model is equipped with the flow guide plate, utilizes venturi effect, can ensure that the granule that cuts flows out from the water outlet fast, thereby effectively prevents the cohesion between granules.

Description

Technical Field

[0001] This utility model relates to an underwater pelletizing device for the production of polylactic acid foamed granules, belonging to the field of polylactic acid foamed granule production equipment. Background Technology

[0002] Polylactic acid (PLA) foam granules are widely used in packaging, 3D printing, and medical materials due to their environmental friendliness, biodegradability, and cushioning properties. In the production process of PLA foam granules, the molten material extruded from the extruder needs to be cut into shape using a pelletizing device. Because molten PLA foam granules have a high viscosity, traditional pelletizing methods are prone to clumping or sticking to the cutting blade. Underwater pelletizing, using a water-assisted cutting medium, can effectively reduce the risk of material adhesion and ensure production continuity. Furthermore, underwater pelletizing can control the shape and size of the granules while achieving rapid cooling and solidification, ensuring product quality. Therefore, underwater pelletizing is commonly used in the production of PLA foam granules.

[0003] For example, Chinese utility model patent CN214293911U discloses an energy-saving underwater pelletizer for EVA granules. While the aforementioned prior art can achieve underwater pelletizing of foamed granules, it has the following drawbacks: because the main body of the water flow in the storage pipe is far from the pelletizing blades, dead zones exist within the water flow within the storage pipe, causing the cut granules to easily stick together inside, thus affecting the molding quality of the foamed granules. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide an underwater pelletizing device for polylactic acid foaming granule production that facilitates timely removal of granules from the water tank.

[0005] The underwater pelletizing device for polylactic acid foam granule production described in this utility model includes a base, on which a first cutter holder and a motor are mounted. A water tank is fixedly connected to the left end of the first cutter holder. The water tank has an inlet and an outlet. A guide plate with a Z-shaped cross section is fixedly connected to the inlet and the inside of the water tank. A rotating shaft connected to the motor is rotatably connected inside the first cutter holder. A second cutter holder located inside the water tank is fixedly connected to the rotating shaft. A cutter is mounted on the second cutter holder. A through hole corresponding to the second cutter holder is passed through the guide plate. An installation sleeve is provided at the left end of the water tank. An inlet and a die head are installed inside the installation sleeve. Multiple discharge holes corresponding to the cutter are passed through the die head. The inlet has an inlet channel and a material distribution groove corresponding to the discharge holes.

[0006] Furthermore, a support block is fixedly connected between the back side of the guide plate and the inner wall of the inlet.

[0007] Furthermore, an electromagnetic induction heating ring is connected to the outer side of the mounting sleeve.

[0008] Furthermore, the die head is placed inside the mounting sleeve, the feed port is threadedly connected to the mounting sleeve, and a pressure ring is connected between the feed port and the die head.

[0009] Furthermore, the discharge orifice includes a feeding section, a transition section, and a discharge section, which are arranged sequentially from left to right, and the diameter of the feeding section is larger than the diameter of the discharge section.

[0010] Furthermore, the fabric trough is a frustum-shaped cone, smaller on the left and larger on the right, and the left end of the die head is connected to a guide body corresponding to the fabric trough.

[0011] Furthermore, the guide body is threadedly connected to the die head.

[0012] Working principle and process:

[0013] During use, water enters the water tank through the inlet and exits through the outlet. The motor operates, driving the cutter to rotate via the shaft and the second cutter holder. The material extruded from the extruder enters the feed inlet through the feed channel, then enters each discharge hole through the distribution trough. The molten material flowing out of the discharge hole is cut into particles by the rotating cutter. The cut particles are then discharged through the outlet with the water flow to the next process. Because a contraction-expansion flow channel is formed between the inlet, guide plate, die head and outlet, a high-speed shearing water flow is formed at the cutter according to the Venturi effect, thereby ensuring that the particles flow out of the outlet quickly.

[0014] The advantages of this utility model compared with the prior art are:

[0015] The polylactic acid foaming granule production underwater pelletizing device of this utility model is equipped with a guide plate. Utilizing the Venturi effect, it can ensure that the cut granules flow out of the water outlet quickly, thereby effectively preventing the granules from sticking together and improving the product molding quality. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 yes Figure 1 Enlarged view at point M;

[0018] Figure 3 yes Figure 1 A magnified view of point N in the middle.

[0019] In the diagram: 1. Base; 2. Motor; 3. First cutter holder; 4. Water tank; 5. Rotating shaft; 6. Second cutter holder; 7. Discharge hole; 8. Material feeding groove; 9. Material guide body; 10. Feeding channel; 11. Feed inlet; 12. Electromagnetic induction heating ring; 13. Die head; 14. Cutter; 15. Mounting sleeve; 16. Guide plate; 17. Water outlet; 18. Water inlet; 19. Support block; 20. Pressure ring; 21. Feeding section; 22. Transition section; 23. Discharge section; 24. Through hole. Detailed Implementation

[0020] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0021] Example 1:

[0022] like Figures 1 to 3 As shown, the underwater pelletizing device for polylactic acid foaming granule production of this utility model includes a base 1, on which a first cutter holder 3 and a motor 2 are installed. A water tank 4 is fixedly connected to the left end of the first cutter holder 3. The water tank 4 is provided with an inlet 18 and an outlet 17. A guide plate 16 with a Z-shaped cross section is fixedly connected to the inlet 18 and the inside of the water tank 4. A rotating shaft 5 connected to the motor 2 is rotatably connected inside the first cutter holder 3. A second cutter holder 6 located inside the water tank 4 is fixedly connected to the rotating shaft 5. A cutter 14 is installed on the second cutter holder 6. A through hole 24 corresponding to the second cutter holder 6 is passed through the guide plate 16. An installation sleeve 15 is provided at the left end of the water tank 4. An inlet 11 and a die head 13 are installed inside the installation sleeve 15. A plurality of discharge holes 7 corresponding to the cutter 14 are passed through the die head 13. An inlet channel 10 and a material distribution groove 8 corresponding to the discharge holes 7 are provided inside the inlet 11.

[0023] During use, water enters the water tank 4 through the inlet 18 and is discharged through the outlet 17. The motor 2 is activated, driving the cutter 14 to rotate via the rotating shaft 5 and the second cutter holder 6. The material extruded from the extruder enters the feed inlet 11 through the feed channel 10, and then enters each discharge hole 7 through the material distribution groove 8. The molten material flowing out of the discharge hole 7 is cut into particles by the rotating cutter 14. Then, the cut particles are discharged with the water flow through the outlet 17 to the next process. Since a contraction-expansion flow channel is formed between the inlet 18, the guide plate 16, the die head 13 and the outlet 17, a high-speed shearing water flow is formed at the cutter 14 according to the Venturi effect, thereby ensuring that the particles flow out quickly through the outlet 17.

[0024] Example 2:

[0025] like Figures 1 to 3 As shown, based on Example 1,

[0026] Furthermore, a support block 19 is fixedly connected between the back side of the guide plate 16 and the inner wall of the inlet 18.

[0027] Furthermore, an electromagnetic induction heating ring 12 is connected to the outer side of the mounting sleeve 15. The electromagnetic induction heating ring 12 can heat the die head 13, thereby heating the molten material, effectively preventing the material from solidifying and ensuring the material's fluidity.

[0028] Furthermore, the die head 13 is placed inside the mounting sleeve 15, and the feed port 11 is threadedly connected to the mounting sleeve 15. A pressure ring 20 connects the feed port 11 and the die head 13. By screwing the feed port 11 into the mounting sleeve 15, the die head 13 can be pressed tightly inside the mounting sleeve 15 by the pressure ring 20. By disassembling the feed port 11, the die head 13 can be removed, thus facilitating the maintenance and replacement of the die head 13.

[0029] Furthermore, the discharge orifice 7 includes an inlet section 21, a transition section 22, and a discharge section 23, which are arranged sequentially from left to right. The diameter of the inlet section 21 is larger than that of the discharge section 23. The discharge orifice 7 adopts a large-aperture inlet and small-aperture outlet design, which can effectively reduce the pressure at the discharge end, thereby improving the stability of the discharge pressure and further improving the uniformity of particle size, ensuring the quality of product molding.

[0030] Furthermore, the material feeding trough 8 is a frustoconical shape with a smaller left side and a larger right side, and the left end of the die head 13 is connected to a guide body 9 corresponding to the material feeding trough 8. The guide body 9 cooperates with the material feeding trough 8 to guide the material, making it easier for the material to enter the discharge hole 7.

[0031] Furthermore, the guide body 9 is threadedly connected to the die head 13. The guide body 9 can be disassembled, thereby facilitating its maintenance.

[0032] It should be noted that in the description of this utility model, the terms "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. An underwater pelletizing device for producing polylactic acid foamed granules, characterized in that: Includes a base (1), on which a first cutter holder (3) and a motor (2) are mounted. A water tank (4) is fixedly connected to the left end of the first cutter holder (3). The water tank (4) is provided with an inlet (18) and an outlet (17). A guide plate (16) with a Z-shaped cross section is fixedly connected to the inlet (18) and the inside of the water tank (4). A rotating shaft (5) connected to the motor (2) is rotatably connected inside the first cutter holder (3). A second cutter located inside the water tank (4) is fixedly connected to the rotating shaft (5). The second cutter holder (6) is equipped with a cutter (14), and the guide plate (16) has a through hole (24) corresponding to the second cutter holder (6). The left end of the water tank (4) is provided with an installation sleeve (15), and the installation sleeve (15) is equipped with a feed port (11) and a die head (13). The die head (13) has multiple discharge holes (7) corresponding to the cutter (14) through it. The feed port (11) is provided with a feed channel (10) and a material distribution groove (8) corresponding to the discharge holes (7).

2. The underwater pellet cutting device for producing polylactic acid foamed particles according to claim 1, characterized by: A support block (19) is fixedly connected between the back side of the guide plate (16) and the inner wall of the inlet (18).

3. The underwater pellet cutting device for producing polylactic acid foamed particles according to claim 1, characterized by: An electromagnetic induction heating ring (12) is connected to the outside of the mounting sleeve (15).

4. The underwater pellet cutting device for producing polylactic acid foamed particles according to claim 1, characterized by: The die head (13) is placed inside the mounting sleeve (15), the feed port (11) is threadedly connected to the mounting sleeve (15), and a pressure ring (20) is connected between the feed port (11) and the die head (13).

5. The underwater pellet cutting device for producing polylactic acid foamed particles according to claim 1, characterized by: The discharge hole (7) includes a feeding section (21), a transition section (22) and a discharge section (23), which are arranged sequentially from left to right. The diameter of the feeding section (21) is larger than that of the discharge section (23).

6. The underwater pellet cutting device for producing polylactic acid foamed particles according to any one of claims 1 to 5, characterized by: The fabric trough (8) is a frustum-shaped cone with a smaller left side and a larger right side. The left end of the die head (13) is connected to a guide body (9) corresponding to the fabric trough (8).

7. The underwater pellet cutting device for producing polylactic acid foamed particles according to claim 6, characterized by: The guide body (9) is threadedly connected to the die head (13).

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