Plastic bottle blow molding die forming structure
By combining a liquid nitrogen cooling system with an air compressor, the problem of low efficiency in traditional air cooling is solved, enabling high-quality molding of plastic bottles and ensuring the stability and safety of the molded structure.
Patent Information
- Application Number
- CN202422657610.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In traditional blow molding structures, the heat transfer efficiency of the air-cooling system decreases at high temperatures, leading to a decline in the molding quality of plastic bottles and problems such as low dimensional accuracy, uneven wall thickness, and surface defects.
The system uses a liquid nitrogen cooling system in conjunction with an air compressor. Liquid nitrogen cooling is achieved through copper pipes and liquid nitrogen tanks, while air nozzles and hydraulic cylinders control the gas flow rate to achieve precise cooling and stability in the blow molding process.
It improves the molding quality of plastic bottles, solves the problem of poor cooling effect at high temperatures, ensures the dimensional accuracy and wall thickness uniformity of plastic bottles, and enhances production stability and safety.
Smart Images
Figure CN223478309U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blow molding technology, and in particular to a blow molding structure for plastic bottles. Background Technology
[0002] Plastic bottles are containers made of plastic, typically used to store liquids, powders, or granular substances. In the production of plastic bottles, blow molding is an important process. Blow molding involves placing a molten plastic preform into a mold, inflating the preform with compressed air or other gases to make it adhere tightly to the inner wall of the mold, and then cooling and solidifying it to obtain a hollow plastic product. This process is used for blow molding structures.
[0003] Traditional blow molding begins by placing the preform into a heating device, where it is uniformly heated to a suitable softening state for blow molding. A clamping device then quickly activates, tightly clamping the heated preform to prevent displacement or deformation during the blow molding process. Next, the blow molding system begins operation, precisely injecting compressed air or other gases into the preform. This causes the preform to rapidly expand under gas pressure, inflating it into the desired mold shape. Maintaining stable gas pressure ensures a tight fit between the plastic bottle and the mold. The bottle is then cooled by a fast-flowing air cooling system that removes heat, promoting rapid cooling and setting. During cooling, the mold design and cooling system layout ensure uniform cooling of all parts of the product, guaranteeing quality and dimensional accuracy. Once the bottle has cooled and set, the demolding system begins operation.
[0004] In existing blow molding structures, the cooling system during the blow molding process is used to prevent plastic bottle deformation. While the cooling system enhances the strength of the plastic bottle, it can also alter its transparency. Typically, an air-cooled system consists of a fan, air ducts, and heat sinks. However, at high temperatures, a reduced temperature difference leads to decreased heat transfer efficiency. This is because heat transfer is primarily driven by temperature difference; at high temperatures, the temperature difference between the heat sink and the surrounding air decreases, slowing down heat transfer and affecting heat dissipation. Reduced cooling efficiency significantly impacts the temperature of the plastic preform. When air cooling is used to cool the preform but is ineffective, the preform temperature becomes difficult to control. Excessive temperature increases the fluidity of the plastic, causing preform deformation and potentially degrading the plastic, thus affecting its performance. It can also cause uneven bottle wall thickness. This situation severely impacts the quality of the blow-molded plastic bottle structure. Once the preform temperature becomes uncontrolled, the quality of the molded structure deteriorates, resulting in problems such as low dimensional accuracy, uneven wall thickness, and surface defects. Therefore, this paper proposes a new blow-molded plastic bottle structure to address these issues. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a plastic bottle blow molding structure, which aims to improve the problem that the use of air cooling in the prior art has a serious impact on the quality of the plastic bottle blow molding structure.
[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0007] A blow molding structure for plastic bottles includes an outer shell, a copper pipe fixedly connected inside the outer shell, a third fixed plate fixedly connected to the side wall of the copper pipe, a circulation tank fixedly connected inside the third fixed plate, a first connecting steel pipe fixedly connected to the bottom of the circulation tank, a pressure gauge fixedly connected to the top of the first connecting steel pipe, a second fixed plate fixedly connected inside the outer shell, a transfer pump fixedly connected to the top of the second fixed plate, a first valve fixedly connected to the top of the transfer pump, a first connecting pipe fixedly connected to the top of the first valve, a second connecting steel pipe fixedly connected to one end of the first connecting pipe, a copper pipe fixedly connected to one end of the second connecting steel pipe, a first template fixedly connected to the outer wall of the copper pipe, a fixed bracket fixedly connected to the side wall of the first template, a fixed bracket fixedly connected to the bottom of the fixed bracket at the top of the outer shell, an emergency stop assembly provided on the side wall of the outer shell, and a drive assembly provided at the top of the outer shell.
[0008] The emergency stop assembly includes a connecting bracket, the side wall of which is fixedly connected to the side wall of the housing, and a control plate is fixedly connected to the side wall of the connecting bracket. An emergency stop switch is rotatably connected inside the control plate. The emergency stop assembly is used to control the stopping and starting functions of the mechanism.
[0009] As a further description of the above technical solution:
[0010] The drive assembly includes a telescopic bracket, the bottom of which is fixedly connected to the top of the housing;
[0011] As a further description of the above technical solution:
[0012] A first fixing plate is fixedly connected inside the outer shell, an air compressor is fixedly connected to the top of the first fixing plate, a second connecting pipe is fixedly connected to the output end of the air compressor, and a second valve is fixedly connected to one end of the second connecting pipe.
[0013] As a further description of the above technical solution:
[0014] A fixing rod is fixedly connected to the top of the outer shell, a base plate is fixedly connected to the top of the fixing rod, an L-shaped fixing plate is fixedly connected to the top of the base plate, and a fourth fixing plate is fixedly connected to the side wall of the L-shaped fixing plate.
[0015] As a further description of the above technical solution:
[0016] A hydraulic cylinder is fixedly connected inside the fourth fixing plate, and a hollow column is fixedly connected to the output end of the hydraulic cylinder.
[0017] As a further description of the above technical solution:
[0018] The output end of the telescopic bracket is fixedly connected to a second template, and the bottom of the second template is slidably connected to the top of the outer shell.
[0019] As a further description of the above technical solution:
[0020] An air nozzle is fixedly connected to one end of the hollow column, and a first fixing tube is fixedly connected inside the hollow column.
[0021] As a further description of the above technical solution:
[0022] A fifth fixing plate is fixedly connected to the inner wall of the outer shell, and a first liquid nitrogen tank is fixedly connected to the side wall of the fifth fixing plate. The bottom of the first liquid nitrogen tank is fixedly connected to the top of the first connecting steel pipe.
[0023] This utility model has the following beneficial effects:
[0024] 1. In this utility model, liquid nitrogen is transported through the first connecting steel pipe by the movement of the transfer pump, and then the liquid nitrogen is transferred into the interior of the first connecting pipe again by the transfer pump. One end of the first connecting pipe is connected to a copper pipe for cooling. The copper pipe is fixed inside the first template, which achieves the effect of cooling with liquid nitrogen. This solves the problem that the cooling effect is greatly reduced when using air cooling to cool plastic bottles at high temperatures, and improves the practicality of the blow molding structure.
[0025] 2. In this utility model, compressed air is transmitted to the inside of the second valve through the second connecting pipe by an air compressor, and then the air is squeezed into the inside of the hollow column through the first fixed pipe. Then, the blow molding operation is carried out through the air nozzle, which achieves the effect of slow blow molding operation. This solves the problem that a large amount of air enters the plastic preform during traditional blow molding, which leads to a decrease in blow molding quality and improves the stability of the blow molding structure. Attached Figure Description
[0026] Figure 1 This is a three-dimensional schematic diagram of a blow molding structure for a plastic bottle proposed in this utility model;
[0027] Figure 2 This is a schematic diagram of the side wall structure of the first template of the blow molding structure for a plastic bottle proposed in this utility model.
[0028] Figure 3 This is a schematic diagram of the top structure of the first fixing plate of the blow molding structure for a plastic bottle proposed in this utility model.
[0029] Figure 4 This is a cross-sectional structural diagram of the first template of the blow molding structure for a plastic bottle proposed in this utility model.
[0030] Legend:
[0031] 1. Outer shell; 2. Control panel; 3. Emergency stop switch; 4. Connecting bracket; 5. Fixed bracket; 6. First template; 7. Second template; 8. Telescopic bracket; 9. First fixed plate; 10. Second fixed plate; 11. First connecting pipe; 12. Transfer pump; 13. First liquid nitrogen tank; 14. Pressure gauge; 15. First connecting steel pipe; 16. Circulation tank; 17. First valve; 18. Air compressor; 19. Second connecting pipe; 20. L-shaped fixed plate; 21. Hydraulic cylinder; 22. Hollow column; 23. Air nozzle; 24. First fixed pipe; 25. Second valve; 26. Second connecting steel pipe; 27. Copper pipe; 28. Third fixed plate; 29. Base plate; 30. Fixed rod; 31. Fourth fixed plate; 32. Fifth fixed plate. Detailed Implementation
[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0033] Reference Figure 1 , Figure 2 and Figure 4This utility model provides an embodiment of a plastic bottle blow molding structure, including an outer shell 1. A copper tube 27 is fixedly connected inside the outer shell 1, and the copper tube 27 can better conduct heat. A third fixing plate 28 is fixedly connected to the side wall of the copper tube 27. A circulation tank 16 is fixedly connected inside the third fixing plate 28. The circulation tank 16 uses liquid nitrogen to better maintain the temperature. A first connecting steel pipe 15 is fixedly connected to the bottom of the circulation tank 16. A pressure gauge 14 is fixedly connected to the top of the first connecting steel pipe 15. A second fixing plate 10 is fixedly connected inside the outer shell 1. The top of the second fixing plate 10... A transfer pump 12 is fixedly connected. A first valve 17 is fixedly connected to the top of the transfer pump 12. A first connecting pipe 11 is fixedly connected to the top of the first valve 17. A second connecting steel pipe 26 is fixedly connected to one end of the first connecting pipe 11. The second connecting steel pipe 26 is fixed to the first connecting pipe 11 with a nut, which makes it easier to maintain and replace the first connecting pipe 11. A copper pipe 27 is fixedly connected to one end of the second connecting steel pipe 26. A first template 6 is fixedly connected to the outer wall of the copper pipe 27. A fixed bracket 5 is fixedly connected to the side wall of the first template 6. The bottom of the fixed bracket 5 is fixedly connected to the top of the outer shell 1.
[0034] Specifically, when using the blow molding structure for plastic bottles, firstly, the transfer pump 12 starts working, drawing liquid nitrogen from the circulation tank 16 through the first liquid nitrogen tank 13. The circulation tank 16 plays a crucial role in this process, circulating the liquid nitrogen in the first liquid nitrogen tank 13 to ensure a continuous supply of liquid nitrogen. Subsequently, the liquid nitrogen is drawn out through the first connecting steel pipe 15. It is worth noting that the pressure gauge 14 is fixed inside the first connecting steel pipe 15, which can monitor the pressure in real time and prevent damage to the first connecting steel pipe 15 due to excessive pressure. Next, the liquid nitrogen is transferred to the interior of the second mold plate 7 through the first connecting pipe 11. At the same time, one end of the first connecting pipe 11 is fixed inside the copper pipe 27, which in turn is fixed inside the first mold plate 6. This design effectively achieves the cooling effect of liquid nitrogen, providing suitable temperature conditions for the molding of plastic bottles.
[0035] Reference Figure 1 and Figure 3The outer casing 1 is made of iron, providing good support while being relatively inexpensive. A first fixing plate 9 is fixedly connected inside the outer casing 1. An air compressor 18 is fixedly connected to the top of the first fixing plate 9. A second connecting pipe 19 is fixedly connected to the output end of the air compressor 18. A second valve 25 is fixedly connected to one end of the second connecting pipe 19. The second valve 25 is used to control the gas flow rate and is made of copper. A fixing rod 30 is fixedly connected to the top of the outer casing 1. A base plate 29 is fixedly connected to the top of the fixing rod 30. An L-shaped... The L-shaped fixed plate 20 is fixedly connected to the side wall of the fixed plate 20 with a fourth fixed plate 31. The fourth fixed plate 31 is fixedly connected to the inside of the hydraulic cylinder 21. The output end of the hydraulic cylinder 21 is fixedly connected to a hollow column 22. One end of the hollow column 22 is fixedly connected to an air nozzle 23. The hollow column 22 is fixedly connected to the inside of the first fixed tube 24. The first fixed tube 24 is also made of a hard material. The inner wall of the outer shell 1 is fixedly connected to a fifth fixed plate 32. The side wall of the fifth fixed plate 32 is fixedly connected to a first liquid nitrogen tank 13. The bottom of the first liquid nitrogen tank 13 is fixedly connected to the top of the first connecting steel pipe 15.
[0036] Specifically, the air compressor 18 then begins operation, delivering compressed air through the second connecting pipe 19 to the second valve 25 and the interior of the first fixed pipe 24. It is worth noting that there are four evenly distributed second valves 25. These four valves can precisely control the gas flow rate, enabling more precise operation. Next, the output end of the hydraulic cylinder 21 activates, driving the hollow column 22 to move up and down. During this process, the compressed air is discharged again through the air nozzle 23. This not only allows for better control of the gas flow rate but also significantly improves the molding quality of the plastic bottle, providing a strong guarantee for high-quality product production.
[0037] Reference Figure 1 and Figure 2 An emergency stop assembly is provided on the side wall of the outer shell 1, and a drive assembly is provided on the top of the outer shell 1. The emergency stop assembly includes a connecting bracket 4, which is made of high-strength steel. Its side wall is firmly fixed to the side wall of the outer shell 1 by welding. The side wall of the connecting bracket 4 is fixedly connected to the side wall of the outer shell 1. A control plate 2 is fixedly connected to the side wall of the connecting bracket 4. The control plate 2 is made of plastic material with good insulation properties. An emergency stop switch 3 is rotatably connected inside the control plate 2. The emergency stop assembly is used to control the stopping and starting functions of the mechanism. The drive assembly includes a telescopic bracket 8. The bottom of the telescopic bracket 8 is fixedly connected to the top of the outer shell 1. The output end of the telescopic bracket 8 is fixedly connected to a second template 7. The bottom of the second template 7 is slidably connected to the top of the outer shell 1.
[0038] Specifically, control panel 2 and emergency stop switch 3 play crucial roles. Control panel 2 controls the switching of the molding structure, precisely starting or stopping the entire molding process. Emergency stop switch 3, on the other hand, has the function of quickly stopping equipment operation in emergencies, providing strong protection for production safety. Subsequently, the telescopic support 8 begins its telescopic movement. During this process, it pushes the second template 7 forward, bringing its side tightly against one side of the first template 6, thus achieving the mold closing function.
[0039] Working principle: When using the blow molding structure for plastic bottles, liquid nitrogen is first drawn from the circulation tank 16 through the first liquid nitrogen tank 13 by the transfer pump 12. The liquid nitrogen in the first liquid nitrogen tank 13 is then circulated through the circulation tank 16. Subsequently, liquid nitrogen is drawn out through the first connecting steel pipe 15, and a pressure gauge 14 is fixed inside the first connecting steel pipe 15 to prevent damage. Then, liquid nitrogen is transferred to the inside of the second mold plate 7 through the first connecting pipe 11. One end of the first connecting pipe 11 is then fixed inside the copper pipe 27, and the copper pipe 27 is fixed inside the first mold plate 6, achieving the effect of liquid nitrogen cooling. The telescopic bracket 8 extends and retracts, pushing the second template 7 so that its side is close to the first template 6 for mold closing. Then, the movement of the air compressor 18 compresses air through the second connecting pipe 19 into the interior of the second valve 25 and the first fixed pipe 24. The second valve 25 is evenly distributed in four parts, which can control the gas flow rate separately. Then, the output end of the hydraulic cylinder 21 drives the hollow column 22 to move up and down. The compressed air is discharged again through the air nozzle 23, which can better control the gas flow rate and improve the molding quality of the plastic bottle. Next, the control board 2 and the emergency stop switch 3 control the opening and closing of the molding structure and the emergency stop function.
[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A blow molding structure for a plastic bottle, comprising a shell (1), characterized in that: A copper pipe (27) is fixedly connected inside the outer shell (1). A third fixing plate (28) is fixedly connected to the side wall of the copper pipe (27). A circulation tank (16) is fixedly connected inside the third fixing plate (28). A first connecting steel pipe (15) is fixedly connected to the bottom of the circulation tank (16). A pressure gauge (14) is fixedly connected to the top of the first connecting steel pipe (15). A second fixing plate (10) is fixedly connected inside the outer shell (1). A transfer pump (12) is fixedly connected to the top of the second fixing plate (10). A first pressure gauge (14) is fixedly connected to the output end of the transfer pump (12). A valve (17) is fixedly connected to a first connecting pipe (11) at the top of the first valve (17). A second connecting steel pipe (26) is fixedly connected to one end of the first connecting pipe (11). A copper pipe (27) is fixedly connected to one end of the second connecting steel pipe (26). A first template (6) is fixedly connected to the outer wall of the copper pipe (27). A fixed bracket (5) is fixedly connected to the side wall of the first template (6). The bottom of the fixed bracket (5) is fixedly connected to the top of the outer shell (1). An emergency stop assembly is provided on the side wall of the outer shell (1). A drive assembly is provided on the top of the outer shell (1). The emergency stop assembly includes a connecting bracket (4), the side wall of which is fixedly connected to the side wall of the outer shell (1), and a control plate (2) is fixedly connected to the side wall of the connecting bracket (4). An emergency stop switch (3) is rotatably connected inside the control plate (2). The emergency stop assembly is used to control the stopping and starting functions of the mechanism.
2. The blow molding structure for a plastic bottle according to claim 1, characterized in that: The drive assembly includes a telescopic bracket (8), the bottom of which is fixedly connected to the top of the housing (1).
3. The blow molding structure for a plastic bottle according to claim 1, characterized in that: The outer shell (1) is fixedly connected to a first fixing plate (9), and an air compressor (18) is fixedly connected to the top of the first fixing plate (9). The output end of the air compressor (18) is fixedly connected to a second connecting pipe (19), and a second valve (25) is fixedly connected to one end of the second connecting pipe (19).
4. The blow molding structure for a plastic bottle according to claim 1, characterized in that: A fixing rod (30) is fixedly connected to the top of the outer shell (1), a base plate (29) is fixedly connected to the top of the fixing rod (30), an L-shaped fixing plate (20) is fixedly connected to the top of the base plate (29), and a fourth fixing plate (31) is fixedly connected to the side wall of the L-shaped fixing plate (20).
5. The blow molding structure for a plastic bottle according to claim 4, characterized in that: A hydraulic cylinder (21) is fixedly connected inside the fourth fixing plate (31), and a hollow column (22) is fixedly connected to the output end of the hydraulic cylinder (21).
6. The blow molding structure for a plastic bottle according to claim 2, characterized in that: The output end of the telescopic bracket (8) is fixedly connected to the second template (7), and the bottom of the second template (7) is slidably connected to the top of the outer shell (1).
7. The blow molding structure for a plastic bottle according to claim 5, characterized in that: An air nozzle (23) is fixedly connected to one end of the hollow column (22), and a first fixed tube (24) is fixedly connected inside the hollow column (22).
8. The blow molding structure for a plastic bottle according to claim 1, characterized in that: The inner wall of the outer shell (1) is fixedly connected to a fifth fixing plate (32), and the side wall of the fifth fixing plate (32) is fixedly connected to a first liquid nitrogen tank (13). The bottom of the first liquid nitrogen tank (13) is fixedly connected to the top of the first connecting steel pipe (15).