A rapid thermoforming apparatus for PET cap processing

Abstract

This utility model relates to the field of PET cap processing and discloses a rapid heating and molding device for PET cap processing. It includes a base, a support fixedly connected to the top of the base, a cylinder fixedly connected to the top of the support, a lifting plate fixedly connected to the output end of the cylinder, a drive motor fixedly connected to the outer wall of the base, a rotating rod fixedly connected to the output end of the drive motor, a heat insulation plate fixedly connected to the top of the rotating rod, a heat collection shell provided on the top of the heat insulation plate, and a heat-conducting plate fixedly connected to the top of the heat insulation plate via a connecting rod. In this utility model, a stable heat source is constructed by preheating and circulating heat-conducting oil, and the dual heating of the heat-conducting plate and heating coil quickly reaches the PET molding temperature, improving energy efficiency and temperature uniformity. After mold closing, local supplementary heating by heating elements ensures uniform heating of the raw material. Further processing via station switching and vacuum negative pressure molding improves the production efficiency and quality stability of PET caps.

Description

Technical Field

[0001] This utility model relates to the field of PET cap processing, and in particular to a rapid heating molding device for PET cap processing. Background Technology

[0002] PET caps are bottle caps made of polyethylene terephthalate (PET) material. They are widely used in the packaging of liquids such as carbonated beverages and mineral water. PET material is lightweight, highly transparent, and impact-resistant, and meets food-grade safety standards. It is widely used in packaging for pharmaceuticals, beverages, and other products that require sealing and resistance to chemical corrosion.

[0003] One common method is the high-temperature air circulation heating method. In this method, the air is first preheated to a high temperature, and then this high-temperature air is used to heat the PET preform. During the heating process, the PET preform will continue to rotate, and the high-temperature air will circulate around it, gradually heating it to the plasticizing temperature.

[0004] In existing technologies, high-temperature air is used to heat the raw materials. However, during the heating process, the surface of the preform is prone to brittleness due to high-temperature oxidation, which significantly affects the subsequent molding quality of the bottle. For example, it may cause cracks in the bottle body, reducing the overall strength and sealing performance of the bottle. Secondly, air has low heat capacity and poor heat conduction efficiency, resulting in long heating time and high energy consumption. Furthermore, the heating method is singular, making it difficult to uniformly and accurately heat the raw materials quickly, leading to reduced production efficiency. Therefore, a rapid heating molding device for PET cap processing is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a rapid heating molding device for PET cap processing, which aims to improve the problem of reduced production efficiency caused by the single heating method in the existing rapid heating molding device for PET cap processing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a rapid heating molding device for PET cap processing, comprising a base, a bracket fixedly connected to the top of the base, a cylinder fixedly connected to the top of the bracket, a lifting plate fixedly connected to the output end of the cylinder, a drive motor fixedly connected to the outer wall of the base, a rotating rod fixedly connected to the output end of the drive motor, a heat insulation plate fixedly connected to the top of the rotating rod, a heat collection shell provided on the top of the heat insulation plate, a heat conducting plate fixedly connected to the top of the heat insulation plate via a connecting rod, a forming cavity opened on the top of the heat conducting plate, a heating coil fixedly connected to the inner wall of the forming cavity, a mold one fixedly connected to the bottom of the lifting plate, a mold two fixedly connected to the bottom of the lifting plate, a vacuum pump fixedly connected to the inner wall of the mold two via a pipe, a heating element fixedly connected to the bottom of the mold one, and a heating auxiliary component provided on the outer wall of the base.

[0007] As a further description of the above technical solution:

[0008] The bottom of the heat-conducting plate is attached to the top of the heat-collecting shell, and the outer wall of the heat-collecting shell is fixedly connected to the outer wall of the base.

[0009] As a further description of the above technical solution:

[0010] The forming cavity is provided in two sets and is equidistantly distributed on the top of the heat-conducting plate. The inner walls of the two sets of forming cavities are adapted to the outer walls of mold one and mold two.

[0011] As a further description of the above technical solution:

[0012] The heat collection shell is shaped like an inverted U, and the interior of the heat collection shell is hollow.

[0013] As a further description of the above technical solution:

[0014] The heating auxiliary component includes an oil storage tank, a heating pipe is fixedly connected to the inner wall of the oil storage tank, and a circulation pump is fixedly connected to the inner wall of the oil storage tank through a pipe.

[0015] As a further description of the above technical solution:

[0016] The oil storage tank is located outside the base, the outer wall of the circulation pump is fixedly connected to the outer wall of the oil storage tank, and the circulation pump is fixedly connected to the cavity of the heat collection shell through a pipe.

[0017] As a further description of the above technical solution:

[0018] A small motor is fixedly connected to the outer wall of the oil storage tank, and a rotating shaft is fixedly connected to the output end of the small motor. An agitator blade is fixedly connected to the outer wall of the rotating shaft.

[0019] As a further description of the above technical solution:

[0020] The rotating shaft passes through one side of the outer wall of the oil storage tank and is rotatably connected to the inner wall of the oil storage tank. The stirring blade is located at the top of the heating tube.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a stable heat source is constructed by preheating the heat transfer oil and circulating it for heat preservation. Combined with the dual heating of the heat transfer plate and the heating coil, the PET molding temperature is quickly reached, which improves energy efficiency and heating consistency. After the mold is closed, the heating plate provides local supplementary heating to ensure that the raw material is heated evenly. Then, the process is carried out through station switching and vacuum negative pressure molding. At the same time, continuous processing and automated control are integrated to improve the production efficiency and quality stability of PET caps.

[0023] 2. In this utility model, the heat transfer oil is preheated and continuously stirred by the stirring blade to ensure uniform oil temperature, which effectively avoids local overheating or temperature difference, improves heat transfer efficiency and energy utilization. Combined with the dual heating of the heat transfer plate and the heating ring, the PET molding temperature can be quickly and accurately reached. After the mold is closed, the heating plate supplements the heat to ensure that the raw material is heated evenly. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the main structure of a rapid heating molding device for PET cap processing proposed in this utility model;

[0025] Figure 2 This is a bottom view schematic diagram of the main structure of a rapid heating molding device for PET cap processing proposed in this utility model;

[0026] Figure 3 This utility model proposes a rapid heating molding device for PET cap processing. Figure 2 Enlarged view of region A in the middle;

[0027] Figure 4 This is a top view of a partial structure of a rapid heating molding device for PET cap processing proposed in this utility model;

[0028] Figure 5 This is a top-down view of a partial structure of a rapid heating molding device for PET cap processing proposed in this utility model.

[0029] Legend:

[0030] 1. Base; 2. Bracket; 3. Cylinder; 4. Lifting plate; 5. Drive motor; 6. Rotating rod; 7. Heat insulation plate; 8. Heat collection shell; 9. Heat conduction plate; 10. Forming cavity; 11. Mold one; 12. Mold two; 13. Vacuum pump; 14. Heating element; 15. Heating coil; 16. Oil tank; 17. Circulating pump; 18. Heating tube; 19. Small motor; 20. Rotating shaft; 21. Stirring blade. Detailed Implementation

[0031] 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.

[0032] Reference Figures 1-3This utility model provides an embodiment of a rapid heating molding device for PET cap processing, comprising a base 1, a bracket 2 fixedly connected to the top of the base 1, a cylinder 3 fixedly connected to the top of the bracket 2, a lifting plate 4 fixedly connected to the output end of the cylinder 3, a drive motor 5 fixedly connected to the outer wall of the base 1, a rotating rod 6 fixedly connected to the output end of the drive motor 5, and a heat insulation plate 7 fixedly connected to the top of the rotating rod 6. The heat insulation plate 7 is made of high-temperature resistant ceramic material, which can effectively block the heat transfer from the heat conduction plate 9 to the rotating rod 6, preventing the rotating rod 6 from degrading in performance due to high temperature. A heat collection shell 8 is provided on the top of the heat insulation plate 7. The heat collection shell 8 is a hollow structure that can accommodate heat conduction oil to realize heat storage and transfer. The outer wall of the heat collection shell 8 is fixedly connected to the outer wall of the base 1. A heat conduction plate 9 is fixedly connected to the top of the heat insulation plate 7 through a connecting rod. The connecting rod is made of stainless steel, which has good support stability and can ensure the fixed position between the heat conduction plate 9 and the heat insulation plate 7. The bottom of the heat conduction plate 9 is in contact with the top of the heat collection shell 8, and the top of the heat conduction plate 9... The device has a forming cavity 10, the shape of which matches the shape of the PET cap, providing molding space for the PET raw material. Two sets of forming cavities 10 are provided, equidistantly distributed on the top of the heat-conducting plate 9. The two sets of forming cavities 10 can be processed alternately, significantly improving the production efficiency of the device. A heating coil 15 is fixedly connected to the inner wall of the forming cavity 10. The heating coil 15 uses a nickel-chromium alloy heating wire, which has high heating efficiency and uniform heating, enabling rapid heating of the raw material within the forming cavity 10. The bottom of the lifting plate 4 is fixedly connected to... A mold 11 is connected to the bottom of the lifting plate 4, and a mold 2 12 is fixedly connected to the bottom of the mold 11. The inner walls of the two forming cavities 10 are adapted to the outer walls of the mold 11 and the mold 2 12. A vacuum pump 13 is fixedly connected to the inner wall of the mold 2 12 through a pipe. A heating element 14 is fixedly connected to the bottom of the mold 11. Several sets of heating elements 14 are arranged at equal distances at the bottom of the mold 11. Each set of heating elements 14 is hexagonal. The hexagonal structure can maximize the contact area between the heating element 14 and the raw material and improve the heating efficiency.

[0033] Reference Figures 2-4 The outer wall of the base 1 is provided with a heating auxiliary component, which includes an oil storage tank 16, a circulation pump 17, two sets of pipes, two sets of valves, and multiple sets of heating tubes 18. The oil storage tank 16 is located outside the base 1. The top of the oil storage tank 16 has an inlet pipe with a sealing cap for filling with heat transfer oil. The inner wall of the oil storage tank 16 is fixedly connected to the heating tubes 18. The inner wall of the oil storage tank 16 is fixedly connected to the circulation pump 17 through a pipe. The outer wall of the circulation pump 17 is fixedly connected to the outer wall of the oil storage tank 16. The circulation pump 17 is fixedly connected to the cavity of the heat collection shell 8 through a pipe, which can transport the hot oil in the oil storage tank 16 to the heat collection shell 8, realize the recycling of heat, and reduce energy consumption.

[0034] Reference Figures 4-5A small motor 19 is fixedly connected to the outer wall of the oil storage tank 16. The small motor 19 is a geared motor with a moderate speed, which can provide a stable driving force for the rotating shaft 20. The output end of the small motor 19 is fixedly connected to the rotating shaft 20. A sealed bearing is provided at the connection between the rotating shaft 20 and the oil storage tank 16 to prevent the heat transfer oil from leaking and to not affect the rotation of the rotating shaft 20. The rotating shaft 20 passes through one side of the outer wall of the oil storage tank 16 and is rotatably connected to the inner wall of the oil storage tank 16. A stirring blade 21 is fixedly connected to the outer wall of the rotating shaft 20. The stirring blade 21 is located at the top of the heating tube 18. This position allows the heat generated by the heating tube 18 to be quickly transferred to the entire oil storage tank 16 through the stirring of the stirring blade 21, ensuring that the heat transfer oil is heated evenly.

[0035] Working principle: First, the heating auxiliary component is activated, and the heating tube 18 in the oil storage tank 16 is turned on to preheat the heat transfer oil. At the same time, the small motor 19 is started, driving the rotating shaft 20 and the stirring blade 21 to rotate at a constant speed to stir the heat transfer oil, ensuring uniform heating and avoiding local overheating. When the oil temperature reaches the molding temperature required by the PET raw material, the circulation pump 17 is started. The circulation pump 17 pumps the hot oil from the oil storage tank 16 through its inlet pipe, and delivers it to the cavity of the heat collection shell 8 through an insulated pipe that runs through the side wall of the base 1. After the hot oil fills the cavity of the heat collection shell 8, it returns to the oil storage tank 16 through another insulated pipe, thus forming a closed loop. The circulating heating circuit provides a continuous and stable high-temperature environment for raw material molding. Subsequently, the main heating and molding operations are performed. The drive motor 5 starts, and the rotating rod 6 drives the heat insulation plate 7 and the heat conduction plate 9 on it to rotate. This causes one of the forming cavities 10 on the heat conduction plate 9 to rotate to the processing position directly below the mold 11. At this time, the bottom of the heat conduction plate 9 is in contact with the top of the heat collection shell 8 filled with hot oil. The heat from the hot oil is continuously conducted to the heat conduction plate 9 to preheat it. At the same time, the heating coil 15 embedded in the inner wall of the forming cavity 10 is energized and works in conjunction with the preheating to quickly raise the forming cavity 10 to the preset working temperature. The operator then places the PET raw material sheet into the heated forming cavity. In step 10, the control cylinder 3 then moves, pushing the lifting plate 4 downwards. Mold 11 and Mold 2 12, fixed to it, descend accordingly. When Mold 11 first presses into the forming cavity 10 containing the raw material, initial mold closing is completed. After mold closing, the heating element 14 at the bottom of Mold 11 is energized to provide localized contact heating of the sheet material, ensuring uniform softening across all parts. After initial heating, the cylinder 3 pulls the lifting plate 4 upwards, separating Mold 11 from the forming cavity 10. Immediately afterwards, the drive motor 5 restarts, rotating the heat-conducting plate 9 180 degrees, positioning the preheated raw material directly below Mold 2 12. The cylinder 3 then drives the lifting plate 4 downwards again. The mold 12 is pressed into the forming cavity 10 to complete the final mold closing. At this time, the mold 12 and the forming cavity 10 together form a sealed cavity. The vacuum pump 13 is started. The vacuum pump 13 extracts air from the sealed cavity through the ventilation channel (not shown) built into the mold 12 and the lifting plate 4. This is a conventional technique in the field, as well as an external flexible pipe. Under the negative pressure, the softened PET material adheres tightly to the surface of the mold 12. After cooling and shaping, it forms a PET cap. During this process, the other forming cavity 10 is moved to the bottom of the mold 11 for feeding and preheating, thereby realizing the cyclical alternation of the two stations and greatly improving production efficiency.

[0036] 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 rapid heating molding device for PET cap processing, comprising a base (1), a bracket (2) fixedly connected to the top of the base (1), a cylinder (3) fixedly connected to the top of the bracket (2), and a lifting plate (4) fixedly connected to the output end of the cylinder (3), characterized in that: A drive motor (5) is fixedly connected to the outer wall of the base (1). A rotating rod (6) is fixedly connected to the output end of the drive motor (5). A heat insulation plate (7) is fixedly connected to the top of the rotating rod (6). A heat collection shell (8) is provided on the top of the heat insulation plate (7). A heat conduction plate (9) is fixedly connected to the top of the heat insulation plate (7) through a connecting rod. A forming cavity (10) is opened on the top of the heat conduction plate (9). A heating coil (15) is fixedly connected to the inner wall of the forming cavity (10). A mold one (11) is fixedly connected to the bottom of the lifting plate (4). A mold two (12) is fixedly connected to the bottom of the lifting plate (4). A vacuum pump (13) is fixedly connected to the inner wall of the mold two (12) through a pipe. A heating element (14) is fixedly connected to the bottom of the mold one (11). A heating auxiliary component is provided on the outer wall of the base (1).

2. The rapid heating molding apparatus for PET cap processing according to claim 1, characterized in that: The bottom of the heat-conducting plate (9) is attached to the top of the heat-collecting shell (8), and the outer wall of the heat-collecting shell (8) is fixedly connected to the outer wall of the base (1).

3. The rapid heating molding apparatus for PET cap processing according to claim 1, characterized in that: The forming cavity (10) is provided in two sets and is equidistantly distributed on the top of the heat-conducting plate (9). The inner walls of the two sets of forming cavities (10) are adapted to the outer walls of mold one (11) and mold two (12).

4. The rapid heating molding apparatus for PET cap processing according to claim 1, characterized in that: The heat collection shell (8) is arranged in an inverted U-shape, and the interior of the heat collection shell (8) is arranged in a cavity.

5. A rapid heating molding apparatus for PET cap processing according to claim 1, characterized in that: The heating auxiliary component includes an oil storage tank (16), a heating pipe (18) is fixedly connected to the inner wall of the oil storage tank (16), and a circulation pump (17) is fixedly connected to the inner wall of the oil storage tank (16) through a pipe.

6. A rapid heating molding apparatus for PET cap processing according to claim 5, characterized in that: The oil storage tank (16) is located outside the base (1), the outer wall of the circulation pump (17) is fixedly connected to the outer wall of the oil storage tank (16), and the circulation pump (17) is fixedly connected to the cavity of the heat collection shell (8) through a pipe.

7. A rapid heating molding apparatus for PET cap processing according to claim 5, characterized in that: A small motor (19) is fixedly connected to the outer wall of the oil storage tank (16), and a rotating shaft (20) is fixedly connected to the output end of the small motor (19). An stirring blade (21) is fixedly connected to the outer wall of the rotating shaft (20).

8. A rapid heating molding apparatus for PET cap processing according to claim 7, characterized in that: The rotating shaft (20) passes through one side of the outer wall of the oil storage tank (16) and is rotatably connected to the inner wall of the oil storage tank (16). The stirring blade (21) is located at the top of the heating tube (18).

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