Parison extrusion head structure for producing high-density polyethylene large hollow blow molding container

Abstract

The utility model provides a parison extrusion head structure for producing a high density polyethylene large hollow blow molding container, and relates to the technical field of parison extrusion head structures, the parison extrusion head structure comprises a workbench and a first connecting box, the first connecting box is internally provided with a stirring assembly, and the stirring assembly comprises a first rotating shaft; and a first bevel gear fixedly sleeves the outer surface, close to one end, of the first rotating shaft. According to the device disclosed by the utility model, by arranging the stirring assembly, when a high-density polyethylene solution flows into a second chassis and a cylindrical plate from the inside of a first connecting box, a plurality of rotating first stirring plates and second stirring plates can stir the high-density polyethylene solution, so that the temperature and viscosity of the high-density polyethylene solution tend to be consistent; therefore, the heat of the high-density polyethylene solution is uniformly distributed, the material can be uniformly expanded in the blow molding process, the molding stability is ensured, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of preform extrusion head structure, and in particular to a preform extrusion head structure used in the production of large hollow blow-molded containers of high-density polyethylene. Background Technology

[0002] A preform extruder for blow-molded containers is a device specifically designed to extrude molten plastic into a preform, typically a hollow tubular preform. The main function of this extruder is to extrude the polymer in a specific cross-sectional shape to prepare it for subsequent blow molding processes.

[0003] In existing technologies, the preform extrusion head structure used in the production of large hollow blow-molded containers of high-density polyethylene (HDPE) requires workers to pour HDPE into the feed inlet, and then push, heat, and plasticize the solid polymer material through the screw. However, the viscosity and melting point of HDPE itself vary due to factors such as molecular weight distribution and additives. The portion of the melt with higher viscosity in the screw has greater flow resistance, flows slowly in the screw, and has a longer flow time and heating time; while the melt with lower viscosity has less flow resistance, flows quickly in the screw, and has a shorter flow time and heating time. When the raw materials are from different batches or the mixing is uneven, this viscosity difference becomes more pronounced, resulting in uneven heat distribution in the HDPE solution and uneven preform temperature distribution. This leads to uneven material expansion during blow molding, reducing molding stability and thus reducing production efficiency. Utility Model Content

[0004] The purpose of this invention is to solve the problem in the prior art that when the heat distribution of the high-density polyethylene solution is uneven, the temperature distribution of the preform will be uneven, resulting in uneven material expansion during blow molding, which reduces the stability of the molding and thus reduces production efficiency. The invention proposes a preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene, comprising a workbench and a first connecting box, wherein a stirring assembly is provided inside the first connecting box, the stirring assembly comprising a first rotating shaft, a first helical gear being fixedly sleeved on the outer surface of the first rotating shaft near one end, a first fixing block being fixedly sleeved on the outer surface of the first rotating shaft near the other end, a plurality of uniformly arranged first connecting blocks being fixedly connected to the outer surface of the first fixing blocks, a first fixing shaft being fixedly embedded in the inner wall of each of the plurality of first connecting blocks, a first stirring plate being fixedly connected to one end of each of the plurality of first fixing shafts, and a second rotating shaft being fixedly sleeved on the outer surface of the first rotating shaft.

[0006] Preferably, one end of the first rotating shaft is movably embedded in the inner wall of the first connecting box, a second helical gear is fixedly sleeved on the outer surface of the second rotating shaft near one end, a second fixing block is fixedly sleeved on the outer surface of the second rotating shaft near the other end, and a plurality of uniformly arranged second connecting blocks are fixedly connected to the outer surface of the second fixing block.

[0007] Preferably, a second fixing shaft is fixedly embedded in the inner wall of each of the plurality of second connecting blocks, and a second stirring plate is fixedly connected to one end of each of the plurality of second fixing shafts.

[0008] Preferably, a motor is installed on one outer surface of the workbench, and an output shaft is fixedly connected to the output end of the motor. A fixed disk is fixedly connected to the other outer surface of the workbench. One end of the output shaft movably passes through the inner wall of the workbench and extends to the other side, while the other end of the output shaft movably passes through the interior of the fixed disk.

[0009] Preferably, one end of the output shaft is fixedly connected to a screw, a third fixed shaft is fixedly connected to the outer surface of the fixed disk near the edge, a hopper is fixedly connected to the outer surface of the third fixed shaft near one end, and a fourth fixed block is fixedly sleeved on the outer surface of the third fixed shaft.

[0010] Preferably, the inner wall of the fourth fixing block is provided with a heating wire, the other end of the screw is fixedly connected to a third rotating shaft, one end of the third rotating shaft is fixedly connected to a third helical gear, the outer surface of the third helical gear meshes with the outer surface of the first helical gear, and the outer surface of the third helical gear meshes with the outer surface of the second helical gear.

[0011] Preferably, a first chassis is fixedly connected to the top of the workbench, a second chassis is fixedly connected to the top of the first chassis, and a cylindrical plate is fixedly connected to the top of the second chassis near its edge.

[0012] Preferably, the bottom of the first stirring plate is in contact with the top of the second chassis, and the bottom of the second stirring plate is in contact with the top of the second chassis.

[0013] Preferably, a second connecting box is fixedly fitted on the outer surface of the cylindrical plate near the top, the outer surface of the first connecting box is fixedly connected to the inner wall of the second connecting box, and the outer surface of the third fixed shaft is fixedly embedded in the inner wall of the first connecting box near one end.

[0014] Preferably, a compression rod is fixedly connected to the other end of the first rotating shaft, and a fourth fixed shaft is fixedly connected to the bottom of the second chassis near the center, with an extrusion head provided at one end of the fourth fixed shaft.

[0015] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0016] 1. In this utility model, the device is equipped with a stirring assembly. When the high-density polyethylene solution flows out from the third fixed shaft, it flows into the second chassis and cylindrical plate through the interior of the first connecting box. At this time, multiple rotating first and second stirring plates will stir the high-density polyethylene solution, making its temperature and viscosity more consistent, thereby ensuring that the heat of the high-density polyethylene solution is evenly distributed. During the blow molding process, the material can expand evenly, ensuring the stability of the molding and thus improving production efficiency.

[0017] 2. In this utility model, the device prevents the solution from splashing onto the outer surface of the workbench through the gap between the first connecting box and the cylindrical plate when the high-density polyethylene solution is stirred by installing a second connecting box outside the first connecting box and the cylindrical plate, thereby ensuring the cleanliness of the workbench. Attached Figure Description

[0018] Figure 1 This utility model provides a frontal perspective view of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene;

[0019] Figure 2 This utility model provides a front perspective perspective view of the workbench structure for producing large hollow blow-molded containers of high-density polyethylene.

[0020] Figure 3 A frontal perspective view of the first connecting box of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model.

[0021] Figure 4 A frontal perspective view of the first rotating shaft of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model.

[0022] Figure 5 A front perspective perspective view of the second helical gear in the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model;

[0023] Figure 6 This utility model provides a front perspective perspective view of the screw for the preform extrusion head structure used in the production of large hollow blow-molded containers of high-density polyethylene;

[0024] Figure 7 This utility model provides a front-view perspective view of the hopper of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene;

[0025] Figure 8 A frontal perspective view of the first connecting box of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model.

[0026] Figure 9 A front perspective view of the second connecting box of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model;

[0027] Figure 10 A frontal perspective view of the second connecting block of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model;

[0028] Figure 11 A three-dimensional cross-sectional view of the second base portion of the preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene proposed in this utility model.

[0029] Figure 12 This utility model presents a three-dimensional cross-sectional view of the fourth fixed axis portion of the preform extrusion head structure used in the production of large hollow blow-molded containers of high-density polyethylene.

[0030] Legend: 1. Workbench; 2. First connecting box; 3. Mixing assembly; 301. First rotating shaft; 302. First helical gear; 303. First fixing block; 304. First connecting block; 305. First fixed shaft; 306. First mixing plate; 307. Second helical gear; 308. Second rotating shaft; 309. Second fixing block; 310. Second connecting block; 311. Second fixed shaft; 312. Second mixing plate; 4. Motor; 5. Output shaft; 6. Fixed disc; 7. Third fixed shaft; 8. Hopper; 9. Screw; 10. Fourth fixing block; 11. Heating wire; 12. Third rotating shaft; 13. Third helical gear; 14. First chassis; 15. Second chassis; 16. Cylindrical plate; 17. Compression rod; 18. Fourth fixed shaft; 19. Extruder head; 20. Second connecting box. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0033] Example 1: As Figures 1-12As shown, this utility model provides a preform extrusion head structure for the production of large hollow blow-molded containers of high-density polyethylene, including a workbench 1 and a first connecting box 2. The first connecting box 2 is characterized by an internal stirring assembly 3, which includes a first rotating shaft 301. A first helical gear 302 is fixedly sleeved on the outer surface of the first rotating shaft 301 near one end, and a first fixing block 303 is fixedly sleeved on the outer surface of the first rotating shaft 301 near the other end. Multiple evenly arranged first connecting blocks 304 are fixedly connected to the outer surface of the first fixing blocks 303, and a first fixing shaft 305 is fixedly embedded in the inner wall of each of the multiple first connecting blocks 304. One end of each of the first fixed shafts 305 is fixedly connected to a first stirring plate 306. A second rotating shaft 308 is fixedly sleeved on the outer surface of the first rotating shaft 301. One end of the first rotating shaft 301 is movably embedded in the inner wall of the first connecting box 2. A second helical gear 307 is fixedly sleeved on the outer surface of the second rotating shaft 308 near one end. A second fixing block 309 is fixedly sleeved on the outer surface of the second rotating shaft 308 near the other end. A plurality of evenly arranged second connecting blocks 310 are fixedly connected to the outer surface of the second fixing block 309. A second fixing shaft 311 is fixedly embedded in the inner wall of each of the plurality of second connecting blocks 310. One end of each of the plurality of second fixing shafts 311 is fixedly connected to... A second stirring plate 312 is connected to the workbench 1. A motor 4 is installed on one outer surface of the workbench 1, and an output shaft 5 is fixedly connected to the output end of the motor 4. A fixed plate 6 is fixedly connected to the other outer surface of the workbench 1. One end of the output shaft 5 movably passes through the inner wall of the workbench 1 and extends to the other side. The other end of the output shaft 5 movably passes through the interior of the fixed plate 6. A screw 9 is fixedly connected to one end of the output shaft 5. A third fixed shaft 7 is fixedly connected to the outer surface of the fixed plate 6 near the edge. A hopper 8 is fixedly connected to the outer surface of the third fixed shaft 7 near one end. A fourth fixed block 10 is fixedly sleeved on the outer surface of the third fixed shaft 7. A heating wire is installed on the inner wall of the fourth fixed block 10. 11. The other end of the screw 9 is fixedly connected to the third rotating shaft 12. One end of the third rotating shaft 12 is fixedly connected to the third helical gear 13. The outer surface of the third helical gear 13 meshes with the outer surface of the first helical gear 302. The outer surface of the third helical gear 13 meshes with the outer surface of the second helical gear 307. The top of the workbench 1 is fixedly connected to the first chassis 14. The top of the first chassis 14 is fixedly connected to the second chassis 15. The top of the second chassis 15 is fixedly connected to the cylindrical plate 16 near the edge. The bottom of the first stirring plate 306 is in contact with the top of the second chassis 15. The bottom of the second stirring plate 312 is in contact with the top of the second chassis 15.

[0034] The overall effect of Embodiment 1 is as follows: During the use of the preform extruder structure for producing large hollow blow-molded containers of high-density polyethylene, the operator first needs to pour high-density polyethylene raw material into the hopper 8. Due to gravity, the high-density polyethylene raw material will fall from the bottom of the hopper 8 into the third fixed shaft 7 and contact the outer surface of the screw 9. Then, the operator needs to start the motor 4 and the heating wire 11. The heating wire 11 will generate heat to heat the outer surface of the third fixed shaft 7, and at the same time, the internal temperature of the third fixed shaft 7 will also rise. The motor 4 will drive the output shaft 5 to rotate, and the output shaft 5 will drive the screw 9 to rotate. The outer surface of the screw 9 is in contact with the inside of the third fixed shaft 7. The rotation of the screw 9 inside the third fixed shaft 7 will drive the high-density polyethylene raw material to rotate. The polyethylene raw material spirals within the third fixed shaft 7. When it comes into contact with the heating wire 11, the high temperature gradually melts the high-density polyethylene. Simultaneously, the screw 9 spirals the melted high-density polyethylene solution, moving it along the outer surface of the screw 9 into the first connecting box 2. The rotation of the screw 9 also drives the third rotating shaft 12, which in turn drives the third helical gear 13. The rotation of the third helical gear 13 simultaneously drives the first helical gear 302 and the second helical gear 307. The rotation of the first helical gear 302 drives the first rotating shaft 301. As the first rotating shaft 301 rotates, one end of it rotates along the inner wall of the first connecting box 2. The first rotating shaft 301 drives the first fixed block 303 to rotate. When the first fixed block 303 rotates, it drives multiple first connecting blocks 304 to rotate. When the first connecting blocks 304 rotate, they drive the first fixed shaft 305 to rotate. When the first fixed shaft 305 rotates, it drives the first stirring plate 306 to rotate. When the second helical gear 307 rotates, it drives the inner wall of the second rotating shaft 308 to rotate along the outer surface of the first rotating shaft 301. Simultaneously, the second rotating shaft 308 drives the second fixed block 309 to rotate. The second fixed block 309 drives the second connecting block 310 to rotate. The rotation of the second connecting block 310 drives the second fixed shaft 311 to rotate. When the second fixed shaft 311 rotates, it drives the second stirring plate 312 to rotate. Due to the third helical gear... The first helical gear 302 and the second helical gear 307 rotate in different directions, so the rotation directions of the multiple first stirring plates 306 and the multiple second stirring plates 312 are one counterclockwise and one clockwise, respectively. Through the rotation of the multiple first stirring plates 306 and the multiple second stirring plates 312, the high-density polyethylene solution inside the cylindrical plate 16 is thoroughly mixed. The well-mixed high-density polyethylene solution will fall through the gap in the center of the second base 15 into the fourth fixed shaft 18 and the compression rod 17 due to its own gravity. Simultaneously, the rotation of the first rotating shaft 301 will drive the compression rod 17 to rotate, and the compression rod 17 will transport the high-density polyethylene solution to the extruder head 19 through rotation.This device, by incorporating a stirring assembly 3, uses a motor 4 to rotate the first stirring plate 306 and the second stirring plate 312, thereby mixing the high-density polyethylene solution and ensuring a uniform heat distribution. This solves the problem of uneven heat distribution in the high-density polyethylene solution leading to uneven preform temperature distribution, resulting in uneven material expansion during blow molding, reduced molding stability, and consequently, decreased production efficiency.

[0035] Example 2: As Figures 1-12 As shown, a second connecting box 20 is fixedly sleeved on the outer surface of the cylindrical plate 16 near the top. The outer surface of the first connecting box 2 is fixedly connected to the inner wall of the second connecting box 20. The outer surface of the third fixed shaft 7 is fixedly embedded in the inner wall of the first connecting box 2 near one end. A compression rod 17 is fixedly connected to the other end of the first rotating shaft 301. A fourth fixed shaft 18 is fixedly connected to the bottom of the second chassis 15 near the center. An extrusion head 19 is provided at one end of the fourth fixed shaft 18.

[0036] The overall effect of Embodiment 2 is that, during normal operation of the preform extrusion head structure used for the production of large hollow blow-molded high-density polyethylene containers, the high-density polyethylene solution moves from the inside of the third fixed shaft 7 to the inside of the first connecting box 2, and then falls through the bottom of the first connecting box 2 into the second base plate 15 and the cylindrical plate 16. It is stirred by the stirring assembly 3, which rotates and moves the high-density polyethylene solution during stirring. The high-density polyethylene solution will splash, and the second connecting box 20 is located between the outer surfaces of the first connecting box 2 and the cylindrical plate 16, thereby preventing the high-density polyethylene solution from splashing through the gap between the first connecting box 2 and the cylindrical plate 16 onto the outer surface of the workbench 1, thus preventing contamination of the outer surface of the workbench 1 and ensuring the cleanliness of the workbench 1.

[0037] Working Principle: During operation, the preform extrusion head structure used in the production of large hollow blow-molded high-density polyethylene (HDPE) containers requires the operator to start motor 4. Motor 4 drives output shaft 5 to rotate, which in turn drives screw 9. The molten HDPE flows from the screw 9 inside the third fixed shaft 7, moving it into the first connecting box 2. It then falls through the bottom of the first connecting box 2 into the second base 15 and cylindrical plate 16. The second connecting box 20 is located between the outer surfaces of the first connecting box 2 and the cylindrical plate 16, preventing the HDPE solution from seeping through the gap between them and splashing onto the outer surface of the worktable 1. Screw 9 drives the third rotating shaft 12 to rotate, which in turn drives the third helical gear 13. The rotation of the third helical gear 13 simultaneously drives the first helical gear 302 and the second helical gear 307. The rotation of the first helical gear 302 drives the first rotating shaft 301 to rotate, which in turn drives the first fixed block 303 to rotate. When the fixed block 303 rotates, it drives multiple first connecting blocks 304 to rotate. The rotation of the first connecting blocks 304 drives the first stirring plate 306 to rotate. When the second helical gear 307 rotates, it drives the second rotating shaft 308 to rotate. The second rotating shaft 308 drives the second fixed block 309 to rotate. The second fixed block 309 drives the second connecting block 310 to rotate. The second connecting block 310 drives the second stirring plate 312 to rotate. The rotation directions of the multiple first stirring plates 306 and the multiple second stirring plates 312 are opposite. Through the rotation of the multiple first stirring plates 306 and the multiple second stirring plates 312, the high-density polyethylene solution is thoroughly and evenly mixed. This device, by setting the stirring assembly 3, uses the motor 4 to drive the first stirring plates 306 and the second stirring plates 312 to rotate, thereby mixing the high-density polyethylene solution and ensuring that the heat is evenly distributed. During the blow molding process, the material can expand evenly, ensuring the stability of the molding and thus improving production efficiency.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A preform extrusion head structure for producing high-density polyethylene large hollow blow-molded containers, comprising a workbench (1) and a first connecting box (2), characterized in that: The inside of the first connecting box (2) is provided with a stirring assembly (3), the stirring assembly (3) comprises a first rotating shaft (301), a first bevel gear (302) is fixedly sleeved on the outer surface of the first rotating shaft (301) near one end, a first fixed block (303) is fixedly sleeved on the outer surface of the first rotating shaft (301) near the other end, a plurality of uniformly arranged first connecting blocks (304) are fixedly connected to the outer surface of the first fixed block (303), a first fixed shaft (305) is fixedly embedded in the inner wall of each of the plurality of first connecting blocks (304), a first stirring plate (306) is fixedly connected to one end of each of the plurality of first fixed shafts (305), and a second rotating shaft (308) is fixedly sleeved on the outer surface of the first rotating shaft (301).

2. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 1, characterized by: One end of the first rotating shaft (301) is movably embedded in the inner wall of the first connecting box (2), a second bevel gear (307) is fixedly sleeved on the outer surface of the second rotating shaft (308) near one end, a second fixed block (309) is fixedly sleeved on the outer surface of the second rotating shaft (308) near the other end, and a plurality of uniformly arranged second connecting blocks (310) are fixedly connected to the outer surface of the second fixed block (309).

3. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 2, characterized by: A second fixed shaft (311) is fixedly embedded in the inner wall of each of the plurality of second connecting blocks (310), and a second stirring plate (312) is fixedly connected to one end of each of the plurality of second fixed shafts (311).

4. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 3, characterized by: A motor (4) is arranged on one side of the workbench (1), an output shaft (5) is fixedly connected to the output end of the motor (4), a fixed disc (6) is fixedly connected to the other side of the workbench (1), one end of the output shaft (5) movably penetrates through the inner wall of the workbench (1) and extends to the other side, and one end of the output shaft (5) movably penetrates through the inside of the fixed disc (6).

5. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 4, characterized by: One end of the output shaft (5) is fixedly connected with a screw rod (9), a third fixed shaft (7) is fixedly connected to the outer surface of the fixed disc (6) near the edge, a hopper (8) is fixedly connected to the outer surface of the third fixed shaft (7) near one end, and a fourth fixed block (10) is fixedly sleeved on the outer surface of the third fixed shaft (7).

6. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 5, characterized by: A heating wire (11) is arranged on the inner wall of the fourth fixed block (10), a third rotating shaft (12) is fixedly connected to the other end of the screw rod (9), a third bevel gear (13) is fixedly connected to one end of the third rotating shaft (12), the outer surface of the third bevel gear (13) is engaged with the outer surface of the first bevel gear (302), and the outer surface of the third bevel gear (13) is engaged with the outer surface of the second bevel gear (307).

7. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 6, characterized by: A first bottom disc (14) is fixedly connected to the top of the workbench (1), a second bottom disc (15) is fixedly connected to the top of the first bottom disc (14), and a cylindrical plate (16) is fixedly connected to the top of the second bottom disc (15) near the edge.

8. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 7, characterized by: The bottom of the first stirring plate (306) is attached to the top of the second bottom disc (15), and the bottom of the second stirring plate (312) is attached to the top of the second bottom disc (15).

9. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 8, characterized by: The outer surface of the cylinder plate (16) is fixedly sleeved with a second connecting box (20) near the top, the outer surface of the first connecting box (2) is fixedly connected with the inner wall of the second connecting box (20), and the outer surface of the third fixed shaft (7) is fixedly embedded in the inner wall of the first connecting box (2) near one end.

10. The parison extrusion head structure for high-density polyethylene large-sized hollow blow molding container production according to claim 9, characterized by: The other end of the first rotating shaft (301) is fixedly connected with a compression rod (17), and the bottom of the second bottom disc (15) is fixedly connected with a fourth fixed shaft (18) near the center.

Images