A polyester resin pelletizer

Abstract

The utility model belongs to the field of granulator, especially a kind of polyester resin granulator, it includes extruder, cooling support and granulating support, the output end of extruder is fixedly installed with extrusion head, the inner side of the discharge port of extrusion head is fixedly installed with mould;The side of extruder is equipped with cooling support, the top of granulating support is fixedly installed with cutting bin.The utility model can be moved radially by manual rotation linkage disc after two threaded rods are disassembled, linkage column, tool rest and arc knife are driven, restore granulating precision, then spin into threaded rod fixed, simplify the adjustment step, reduce the loss of cost, and by adopting the mode that air cooling and water cooling are combined, refrigeration fan carries out air cooling cooling to polyester resin strip, circulating pump is cooled liquid in water tank by delivery pipeline, shunt pipeline is delivered to spray pipeline, uniformly sprays on polyester resin strip and carries out water cooling heat dissipation, improves cooling effect and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of pelletizer technology, and in particular to a polyester resin pelletizer. Background Technology

[0002] Polyester resin pelletizers are specialized equipment used to process molten or solid polyester resin (such as PET and PBT) into pellets of specific specifications. They are key supporting equipment in polyester resin production and subsequent processing (such as injection molding and spinning). Their core function is to precisely cut continuous strips or melt streams of polyester resin, after being melted and plasticized in an extruder, into uniformly sized and regularly shaped (mostly cylindrical or square) pellets using a specific cutting method. This facilitates the storage, transportation, and precise metering and processing of the resin in subsequent processes. The equipment typically consists of a feeding system, a cutting system, a cooling system, and a screening system. Parameters need to be adjusted according to the melt index, viscosity, and other characteristics of the polyester resin to ensure pelletizing quality and efficiency.

[0003] Existing pelletizers can restore pelletizing accuracy by adjusting the gap between the cutter head and the material after the blades wear out. However, conventional adjustments require disassembling and adjusting the entire equipment, which is time-consuming. To ensure work efficiency, the entire cutter head must be replaced, which is costly. Furthermore, the cooling system of existing pelletizers may have problems such as a single cooling method and uneven distribution of cooling liquid, resulting in poor cooling effect on the polyester resin strips.

[0004] Therefore, we propose a polyester resin pelletizer to solve the above problems. Utility Model Content

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A polyester resin pelletizer includes an extruder, a cooling support, and a pelletizing support. An extrusion head is fixedly installed on the output end of the extruder, and a mold is fixedly installed on the inner side of the discharge port of the extrusion head. A cooling support is provided on one side of the extruder, and a cooling chamber and a water tank are fixedly installed on the upper and lower sides of the cooling support, respectively. An observation window is provided on one side of the water tank to observe the liquid level in the tank in real time for timely replenishment. The end of the extrusion head with the mold installed extends into the cooling chamber, allowing the high-temperature molten resin strip extruded from the mold to directly enter the cooling area, minimizing morphological changes during heat dissipation and ensuring the regularity of the resin strip after cooling. A cutting chamber is fixedly installed on the top of the pelletizing support, and a bearing seat is fixedly installed on the inner wall of the bottom of the cutting chamber. A cutting shaft is snapped onto the inner side of the bearing seat, and a fixing sleeve is fixedly sleeved on the outer side of the cutting shaft. Multiple evenly distributed linkage bases are fixedly installed on the outer side of the fixing sleeve.

[0007] Specifically, two cooling fans are fixedly installed on the top of the cooling chamber, and three spray pipes are fixedly installed on the inner wall of the top of the cooling chamber. Each of the three spray pipes has multiple nozzles at its bottom. A circulation pump is fixedly installed on the inner wall of the bottom of the water tank. A delivery pipe is fixedly installed on the output end of the circulation pump, and a diversion pipe is fixedly installed at the other end of the delivery pipe. One end of each of the three spray pipes extends out of the cooling chamber and is fixedly connected to the same diversion pipe, which allows the coolant to be sprayed evenly onto the polyester resin strip, ensuring that the polyester resin strip is covered with water mist throughout the cooling process.

[0008] Specifically, the pelletizing support has a discharge chamber at the top, a return groove on the bottom inner wall of the discharge chamber, a barrier net fixedly installed on the inner side of the return groove, and a return pipe fixedly installed inside the pelletizing support. The two ends of the return pipe extend into the return groove and the water tank, respectively, which can greatly improve the reuse rate of cooling water and significantly reduce water consumption in the production process.

[0009] Specifically, a motor slot is provided on one side of the pelletizing bracket, and a servo motor is fixedly installed on the bottom inner wall of the motor slot. A drive wheel is fixedly sleeved on the output end of the servo motor. A transmission wheel is rotatably installed on one side of the cutting chamber. The same belt is wound between the drive wheel and the transmission wheel. The other end of the cutting shaft extends out of the cutting chamber and is fixedly connected to the transmission wheel. The connection part adopts a keyway fit to ensure that the transmission wheel and the cutting shaft rotate synchronously, providing continuous and stable torque to the cutting shaft.

[0010] Specifically, two fixed discs are sleeved on the outer side of the cutting shaft. Both fixed discs are fixedly connected to the same cutting shaft by multiple bolts. A positioning disc is fixedly sleeved on the outer side of the fixed disc closer to the transmission wheel, and a linkage disc is rotatably installed on the outer side of the other fixed disc. By adjusting the angle of the linkage disc, the radial position of the tool holder can be indirectly controlled, thereby adjusting the cutting diameter.

[0011] Specifically, a positioning metal block is fixedly installed on one side of each of the multiple linkage bases. Multiple positioning slots are opened on one side of the positioning plate, and the multiple positioning metal blocks are respectively adapted to the corresponding positioning slots. A guide port is opened on the other side of each of the multiple linkage bases. A linkage column is slidably installed on the inner side of each of the multiple guide ports. The inner wall of the guide port is polished to reduce the resistance when the linkage column slides. At the same time, the linkage column is cylindrical in design, which can prevent jamming with the guide port or the waist-shaped hole during sliding, ensuring smooth motion transmission.

[0012] Specifically, the linkage plate has multiple oblong holes on one side, and multiple linkage columns are slidably installed inside the corresponding oblong holes. A blade holder is slidably installed inside the multiple linkage bases, and a detachable arc-shaped blade is fixedly installed inside the multiple blade holders. The blade of the arc-shaped blade is made of tungsten steel, which has high hardness and wear resistance. The curvature of the blade matches the diameter of the resin strip, ensuring that the resin strip can be completely cut and the cut is flat. At the same time, the blade can be replaced individually after it wears out, without having to replace the entire blade holder, thus reducing maintenance costs.

[0013] Specifically, the linkage plate has two positioning holes on one side, and a detachable threaded rod is fixedly installed on the inner side of each of the two positioning holes. The fixed plate on the same side of the linkage plate has six threaded holes on one side, and the two threaded rods are respectively matched with the three corresponding threaded holes. This allows for convenient and quick adjustment of the rotation angle of the linkage plate, while also ensuring that the linkage plate will not shift during the cutting process, thus ensuring the stability of the cutting process.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] (1) The polyester resin pelletizer of this utility model can be manually rotated by disassembling the two threaded rods, which can drive the linkage column, the blade holder and the arc blade to move radially, restore the pelletizing accuracy, and then screw in the threaded rods to fix it, which simplifies the adjustment steps and reduces the cost.

[0016] (2) The polyester resin pelletizer of this utility model adopts a combination of air cooling and water cooling. The cooling fan cools the polyester resin strips by air cooling, and the circulating pump transports the cooling liquid in the water tank to the spraying pipe through the conveying pipe and the diversion pipe, and sprays it evenly on the polyester resin strips for water cooling heat dissipation, thereby improving the cooling effect and efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a polyester resin pelletizer proposed in this utility model;

[0018] Figure 2 This is a three-dimensional cross-sectional view of a polyester resin pelletizer proposed in this utility model;

[0019] Figure 3 This is a three-dimensional cross-sectional view of the pelletizing support and cutting chamber of a polyester resin pelletizer proposed in this utility model.

[0020] Figure 4 This is a three-dimensional structural disassembly diagram of the cutting shaft, bearing seat, fixed plate, bolt, threaded rod, linkage plate, linkage base, arc blade, linkage column and positioning plate of a polyester resin pelletizer proposed in this utility model.

[0021] Figure 5 This is a three-dimensional structural breakdown diagram of the fixed disc, bolts, threaded holes, threaded rod, linkage disc, positioning hole, linkage base, blade holder, arc blade and linkage column of a polyester resin pelletizer proposed in this utility model.

[0022] Figure 6 This is a three-dimensional structural disassembly diagram of the cutting shaft, fixing disc, bolts, linkage base, fixing sleeve, and positioning metal block of a polyester resin pelletizer proposed in this utility model.

[0023] In the diagram: 1. Extruder; 2. Cooling support; 3. Extrusion head; 4. Die; 5. Cooling chamber; 6. Refrigeration fan; 7. Spray pipe; 8. Diversion pipe; 9. Water tank; 10. Circulation pump; 11. Conveying pipe; 12. Pelletizer support; 13. Barrier net; 14. Return pipe; 15. Servo motor; 16. Drive wheel; 17. Transmission wheel; 18. Belt; 19. Cutting shaft; 20. Cutting chamber; 21. Bearing seat; 22. Fixed plate; 23. Bolt; 24. Threaded hole; 25. Threaded rod; 26. Linkage plate; 27. Positioning hole; 28. Linkage base; 29. ​​Knife holder; 30. Arc-shaped knife; 31. Linkage column; 32. Fixed sleeve; 33. Positioning plate; 34. Positioning metal block. Detailed Implementation

[0024] Reference Figure 1-6 A polyester resin pelletizer includes an extruder 1, a cooling support 2, and a pelletizing support 12. An extrusion head 3 is fixedly installed on the output end of the extruder 1, and a mold 4 is fixedly installed on the inner side of the discharge port of the extrusion head 3. A cooling support 2 is provided on one side of the extruder 1. A cooling chamber 5 and a water tank 9 are fixedly installed on the upper and lower sides of the cooling support 2, respectively. An observation window is provided on one side of the water tank 9 to observe the liquid level in the water tank in real time for timely replenishment. The end of the extrusion head 3 with the mold 4 extends into the cooling chamber 5, so that the high-temperature molten resin strip extruded from the mold 4 can directly enter the cooling area, minimizing the morphological changes during the heat dissipation process and ensuring the regularity of the resin strip after cooling. A cutting chamber 20 is fixedly installed on the top of the pelletizing support 12. A bearing seat 21 is fixedly installed on the bottom inner wall of the cutting chamber 20. A cutting shaft 19 is snapped onto the inner side of the bearing seat 21. A fixing sleeve 32 is fixedly sleeved on the outer side of the cutting shaft 19. Multiple evenly distributed linkage bases 28 are fixedly installed on the outer side of the fixing sleeve 32.

[0025] In this embodiment, two cooling fans 6 are fixedly installed on the top of the cooling chamber 5, and three spray pipes 7 are fixedly installed on the inner wall of the top of the cooling chamber 5. Each of the three spray pipes 7 has multiple nozzles at its bottom. A circulation pump 10 is fixedly installed on the inner wall of the bottom of the water tank 9. A conveying pipe 11 is fixedly installed on the output end of the circulation pump 10, and a diversion pipe 8 is fixedly installed at the other end of the conveying pipe 11. One end of each of the three spray pipes 7 extends out of the cooling chamber 5 and is fixedly connected to the same diversion pipe 8, so that the coolant can be sprayed evenly on the polyester resin strip, ensuring that the polyester resin strip is covered by water mist throughout the cooling process.

[0026] In this embodiment, a discharge chamber is provided at the top of the pelletizing support 12, and a return groove is provided on the bottom inner wall of the discharge chamber. A barrier net 13 is fixedly installed on the inner side of the return groove, and a return pipe 14 is fixedly installed inside the pelletizing support 12. The two ends of the return pipe 14 extend into the return groove and the water tank 9, respectively, which can greatly improve the reuse rate of cooling water and significantly reduce water consumption in the production process.

[0027] In this embodiment, a motor slot is provided on one side of the pelletizing bracket 12, and a servo motor 15 is fixedly installed on the bottom inner wall of the motor slot. A drive wheel 16 is fixedly sleeved on the output end of the servo motor 15. A transmission wheel 17 is rotatably installed on one side of the cutting chamber 20. The same belt 18 is wound between the drive wheel 16 and the transmission wheel 17. The other end of the cutting shaft 19 extends out of the cutting chamber 20 and is fixedly connected to the transmission wheel 17. The connection part adopts a keyway fit to ensure that the transmission wheel 17 rotates synchronously with the cutting shaft 19, providing continuous and stable torque to the cutting shaft 19. Furthermore, a detachable cover is fixedly installed on the top of the cutting chamber 20, which can be easily disassembled by the staff to inspect or adjust the structure inside the cutting chamber 20.

[0028] In this embodiment, two fixing discs 22 are sleeved on the outer side of the cutting shaft 19. Both fixing discs 22 are fixedly connected to the same cutting shaft 19 by multiple bolts 23. The fixing disc 22 closest to the transmission wheel 17 is fixedly sleeved with a positioning disc 33 on its outer side. The other fixing disc 22 is rotatably mounted with a linkage disc 26 on its outer side. By adjusting the angle of the linkage disc 26, the radial position of the tool holder 29 can be indirectly controlled, thereby adjusting the cutting diameter.

[0029] In this embodiment, a positioning metal block 34 is fixedly installed on one side of each of the multiple linkage bases 28, and a plurality of positioning grooves are opened on one side of the positioning disk 33. The plurality of positioning metal blocks 34 are respectively adapted to the corresponding positioning grooves. A guide port is opened on the other side of each of the multiple linkage bases 28, and a linkage column 31 is slidably installed on the inner side of each of the multiple guide ports. The inner wall of the guide port is polished to reduce the resistance when the linkage column 31 slides. At the same time, the linkage column 31 is cylindrical in design, which can avoid jamming with the guide port or the waist-shaped hole when sliding, and ensure the smoothness of motion transmission.

[0030] In this embodiment, a plurality of oblong holes are provided on one side of the linkage disk 26, and a plurality of linkage columns 31 are slidably installed on the inner side of the corresponding oblong holes. A knife holder 29 is slidably installed on the inner side of a plurality of linkage bases 28, and a detachable arc-shaped knife 30 is fixedly installed on the inner side of a plurality of knife holders 29. The blade of the arc-shaped knife 30 is made of tungsten steel, which has high hardness and wear resistance. The curvature of the blade matches the diameter of the resin strip, ensuring that the resin strip can be completely cut and the cut is flat during cutting. At the same time, the knife can be replaced individually after wear, without replacing the entire knife holder, thus reducing maintenance costs.

[0031] In this embodiment, two positioning holes 27 are provided on one side of the linkage disk 26. A detachable threaded rod 25 is fixedly installed on the inner side of the two positioning holes 27 respectively. Six threaded holes 24 are provided on one side of the fixed disk 22 located on the same side of the linkage disk 26. The two threaded rods 25 are respectively matched with the three corresponding threaded holes 24, which can conveniently and quickly adjust the rotation angle of the linkage disk 26. At the same time, it can also ensure that the linkage disk 26 will not deviate during the cutting process, thus ensuring the stability during cutting.

[0032] Working Principle: During the pelletizing process of polyester resin, the worker pours the raw material into the extruder 1. After initial processing by the extruder 1, the molten polyester resin material is extruded through the extrusion head 3 and the die 4, forming six polyester resin strips of the same size. The polyester resin strips enter the cooling chamber 5. At this time, the cooling fan 6 and the circulating pump 10 start simultaneously. While the cooling fan 6 cools the polyester resin strips, the circulating pump 10 transports the cooling liquid in the water tank 9 to the distribution pipe 8 through the conveying pipe 11. The distribution pipe 8 evenly distributes the cooling liquid in three spray pipes 7 and sprays it through its own nozzles, thus cooling the polyester resin strips. The polyester resin strip undergoes water cooling. During this process, the polyester resin strip moves towards the cutting chamber 20. The servo motor 15 drives the drive wheel 16 to rotate, which in turn drives the transmission wheel 17 via a belt. The transmission wheel 17 rotates, causing the cutting shaft 19 to rotate. The cutting shaft 19 rotates, causing the fixed sleeve 32 to rotate, which in turn causes multiple linkage bases 28 to rotate around the cutting shaft 19. Each linkage base 28 has a slidably mounted blade holder 29 on its inner side, and each blade holder 29 has a fixedly mounted detachable arc-shaped blade 30 on its inner side. Therefore, the rotation of the linkage bases 28 respectively drives the corresponding arc-shaped blade 30 to rotate around the cutting shaft 19, cutting the six polyester resin strips and separating them into... The polyester resin granules are cut into granules and move along the discharge chamber at the top of the pelletizing support 12, connected to the coolant. When passing through the barrier mesh 13, the granules are unaffected because their particle size is larger than the mesh size of the barrier mesh 13. The coolant then passes through the barrier mesh 13 into the return tank and then returns to the water tank 9 through the return pipe 14. After the pelletizer has been working for a long time, the multiple arc-shaped blades 30 on it are prone to wear. After wear, the gap between the arc-shaped blades 30 and the polyester resin strips increases. Conventional debugging requires disassembling and adjusting the entire equipment, which is time-consuming. To ensure work efficiency, the entire blade disc must be replaced, which is costly. However, this application only requires the operator to open the cutting chamber. After removing the top cap of 20, the two threaded rods 25 are disassembled and the linkage disc 26 is rotated. The rotation of the linkage disc 26 drives the multiple oblong holes on it to rotate, which in turn drives the multiple linkage columns 31 to move. The multiple linkage columns 31 are slidably installed in the corresponding guide ports. Therefore, the multiple linkage columns 31 can only move radially along the corresponding guide ports. The movement of the multiple linkage columns 31 drives the corresponding knife holders 29 to move. The multiple knife holders 29 drive the corresponding arc-shaped knives 30 to move radially, thereby restoring the cutting accuracy. Then, the workers insert the two threaded rods 25 into the corresponding threaded holes 24 and positioning holes 27 respectively, which simplifies the adjustment steps and reduces cost losses.

[0033] The technological advancements of this invention compared to existing technologies are as follows: By disassembling the two threaded rods 25 and manually rotating the linkage disc 26, the linkage column 31, the blade holder 29, and the arc-shaped blade 30 can be moved radially to restore pelletizing accuracy. Afterward, the threaded rods 25 can be screwed back in to fix them, simplifying the adjustment steps and reducing cost. Furthermore, by employing a combination of air cooling and water cooling, the cooling fan 6 provides air cooling to the polyester resin strip, while the circulating pump 10 delivers the cooling liquid from the water tank 9 to the spraying pipe 7 through the conveying pipe 11 and the diversion pipe 8, uniformly spraying it onto the polyester resin strip for water cooling, thus improving the cooling effect and efficiency.

Claims

1. A polyester resin pelletizer, characterized in that, It includes an extruder (1), a cooling bracket (2) and a pelletizing bracket (12). An extrusion head (3) is fixedly installed on the output end of the extruder (1), and a mold (4) is fixedly installed on the inner side of the discharge port of the extrusion head (3). The extruder (1) is provided with a cooling bracket (2) on one side. The cooling bracket (2) is fixedly installed with a cooling chamber (5) and a water tank (9) on its upper and lower sides respectively. The end of the extruder (3) with the mold (4) installed extends into the cooling chamber (5). The top of the pelletizing support (12) is fixedly installed with a cutting chamber (20), and a bearing seat (21) is fixedly installed on the bottom inner wall of the cutting chamber (20). A cutting shaft (19) is snapped onto the inner side of the bearing seat (21), and a fixing sleeve (32) is fixedly sleeved on the outer side of the cutting shaft (19). Multiple evenly distributed linkage bases (28) are fixedly installed on the outer side of the fixing sleeve (32).

2. The polyester resin pelletizer according to claim 1, characterized in that, Two cooling fans (6) are fixedly installed on the top of the cooling chamber (5). Three spray pipes (7) are fixedly installed on the inner wall of the top of the cooling chamber (5). Multiple nozzles are provided at the bottom of each of the three spray pipes (7). A circulation pump (10) is fixedly installed on the inner wall of the bottom of the water tank (9). A conveying pipe (11) is fixedly installed on the output end of the circulation pump (10). A diversion pipe (8) is fixedly installed at the other end of the conveying pipe (11). One end of each of the three spray pipes (7) extends out of the cooling chamber (5) and is fixedly connected to the same diversion pipe (8).

3. A polyester resin pelletizer according to claim 2, characterized in that, The top of the pelletizing support (12) is provided with a discharge chamber, and the bottom inner wall of the discharge chamber is provided with a return groove. A barrier net (13) is fixedly installed on the inner side of the return groove. A return pipe (14) is fixedly installed inside the pelletizing support (12). The two ends of the return pipe (14) extend into the return groove and the water tank (9) respectively.

4. A polyester resin pelletizer according to claim 3, characterized in that, A motor slot is provided on one side of the pelletizing bracket (12), and a servo motor (15) is fixedly installed on the bottom inner wall of the motor slot. A drive wheel (16) is fixedly sleeved on the output end of the servo motor (15). A transmission wheel (17) is rotatably installed on one side of the cutting chamber (20). The same belt (18) is wound between the drive wheel (16) and the transmission wheel (17). The other end of the cutting shaft (19) extends out of the cutting chamber (20) and is fixedly connected to the transmission wheel (17).

5. A polyester resin pelletizer according to claim 4, characterized in that, Two fixed discs (22) are sleeved on the outside of the cutting shaft (19). Both fixed discs (22) are fixedly connected to the same cutting shaft (19) by multiple bolts (23). The fixed disc (22) closer to the transmission wheel (17) is fixedly sleeved with a positioning disc (33) on the outside, and the other fixed disc (22) is rotatably mounted with a linkage disc (26) on the outside.

6. A polyester resin pelletizer according to claim 5, characterized in that, A positioning metal block (34) is fixedly installed on one side of each of the multiple linkage bases (28). A plurality of positioning slots are opened on one side of the positioning disk (33). The plurality of positioning metal blocks (34) are respectively adapted to the corresponding positioning slots. A guide port is opened on the other side of each of the multiple linkage bases (28). A linkage column (31) is slidably installed on the inner side of each of the multiple guide ports.

7. A polyester resin pelletizer according to claim 6, characterized in that, The linkage plate (26) has multiple waist-shaped holes on one side, and multiple linkage columns (31) are slidably installed on the inner side of the corresponding waist-shaped holes. Multiple linkage bases (28) are slidably installed with knife holders (29) on the inner side, and multiple knife holders (29) are fixedly installed with detachable arc-shaped knives (30) on the inner side.

8. A polyester resin pelletizer according to claim 7, characterized in that, Two positioning holes (27) are provided on one side of the linkage plate (26). A detachable threaded rod (25) is fixedly installed on the inner side of the two positioning holes (27). Six threaded holes (24) are provided on one side of the fixed plate (22) located on the same side of the linkage plate (26). The two threaded rods (25) are respectively matched with the three corresponding threaded holes (24).

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