Die cooling device of large high-performance plastic packaging bag film blowing machine

Abstract

The utility model discloses a die cooling device of a large-scale high-performance plastic packaging bag film blowing machine, which belongs to the technical field of plastic packaging bag processing equipment and comprises a film blowing machine body, a fan is communicated with the outer side of the lower end of the film blowing machine body, an extrusion feeding pipe is communicated with the lower portion of the film blowing machine body through a feeding end, and a cooling device is arranged on the lower portion of the film blowing machine body. A mold is arranged at the upper end of the film blowing machine body, a mold head is installed in the mold, an air ring is arranged at the center of the mold head, an upper cooling assembly is inserted into the upper end of the periphery of the mold, and a lower cooling assembly is arranged at the lower end of the periphery of the mold in a sleeving mode. The mold cooling device is provided with the upper cooling assembly and the lower cooling assembly, passive and active heat dissipation can be conducted on the upper end face, the lower end face, the air ring and the interior of the runner groove of the mold correspondingly, the temperature of all positions of the mold can be rapidly reduced, and the cooling time of the large high-performance plastic packaging bag film blowing machine is saved; the service life of the mold is prolonged while the processing quality of the plastic packaging bag is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic packaging bag processing equipment, and more specifically, to a mold cooling device for a large-scale high-performance plastic packaging bag blowing machine. Background Art

[0002] In order to meet the processing requirements of plastic packaging bags with larger sizes, the die head molds of blowing machines are also getting larger and larger. Generally, the mold diameter reaches 2000 millimeters to 3600 millimeters. During use, in order to improve the flow performance of the extruded plastic mixture, the mold needs to be heated to above 200 °C. After the processing is completed and the machine stops, due to the large size of the mold, the cooling speed is slow, usually taking 5 - 10 days. During this process, the inner and outer sides of the mold are at high temperatures for a long time, which is likely to cause the decomposition of plastic residue, carbonization on the inner side of the mold and the surface of the flow channel, and the carbonized layer adsorbs on the surface of the mold flow channel, seriously affecting the quality of plastic packaging bag products and the service life of the mold. Therefore, it is necessary to design a special mold cooling device for large-scale high-performance plastic packaging bag blowing machines. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a mold cooling device for a large-scale high-performance plastic packaging bag blowing machine. The mold cooling device has upper and lower cooling components, which can passively and actively dissipate heat from the upper and lower end faces of the mold, as well as the inside of the air ring and the flow channel groove respectively, can quickly reduce the temperature at each position of the mold, save the cooling time of the large-scale high-performance plastic packaging bag blowing machine, and extend the service life of the mold while ensuring the processing quality of plastic packaging bags.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A mold cooling device for a large-scale high-performance plastic packaging bag blowing machine, including a blowing machine body. A blower is connected to the outer side of the lower end of the blowing machine body. An extrusion feed pipe is connected to the lower part of the blowing machine body through a feed end. A mold is provided at the upper end of the blowing machine body, and a die head is installed inside the mold. An air ring is provided at the central position of the die head. An upper cooling component is inserted into the upper periphery of the mold, and a lower cooling component is sleeved on the lower periphery of the mold. Both the upper cooling component and the lower cooling component include disc-shaped heat conducting plates, and a number of annularly spaced connecting plates are provided at corresponding positions on the outer side surfaces of the heat conducting plates of the upper cooling component and the lower cooling component. Through holes are provided on the surfaces of the connecting plates. Screws pass through the through holes and are fixed by upper and lower nuts to connect the upper cooling component and the lower cooling component together.

[0006] As a further optimization of this solution, a circular blind groove is provided on the upper surface of the heat conducting plate of the lower cooling component, and the blind groove is clamped on the outer periphery of the lower end face of the mold.

[0007] As a further optimization of this solution, a heat-conducting plug is provided at the center position of the lower surface of the heat-conducting plate of the upper cooling component. Heat-conducting columns corresponding to the positions of the air outlet holes of the air ring are processed on the lower surface of the heat-conducting plug. The heat-conducting columns are inserted into the air outlet holes of the air ring in alignment. A ring-shaped flexible graphite heat-conducting sheet is provided on the lower surface of the heat-conducting plate of the upper cooling component. The flexible graphite heat-conducting sheet is inserted into the ring-shaped flow channel groove along the gap between the mold and the die head.

[0008] As a further optimization of this solution, a circulating water pump is installed on the upper surface of the heat-conducting plate of the upper cooling component. A number of circulating heat-dissipating water pipes are arranged at intervals on the lower surface of the circulating water pump. The circulating heat-dissipating water pipes are externally connected to the inlet and outlet water pipes. The inlet and outlet water pipes are connected to the inlet and outlet water interfaces at the upper end of the cold row frame body. Heat-dissipating fins are installed inside the cold row frame body. A heat-dissipating fan is fixed on the cold row frame body on the inner side of the heat-dissipating fins. The cold row frame body is arranged on the factory floor through a bracket.

[0009] As a further optimization of this solution, the circulating water pump and the heat-dissipating fan are externally connected to a control panel and the factory power supply. The upper cooling component is an integrally formed structure, and the lower cooling component is an assembled structure with two half parts on the left and right.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] In the present utility model, an upper cooling component and a lower cooling component are provided. Among them, the lower cooling component is in a passive heat dissipation mode, and the heat at the lower end face of the mold is led out through the heat-conducting plate and heat-exchanged with the surrounding air. The upper cooling component is in an active heat dissipation mode. Through the heat-conducting plate, heat-conducting plug and flexible graphite heat-conducting sheet structures, the heat at the upper end face of the mold, the air ring and inside the flow channel groove is respectively led out to the circulating heat-dissipating water pipes, and the heat is introduced to the heat-dissipating fins of the cold row frame body through the circulating heat-dissipating water pipes. Finally, heat-exchange is carried out with the air through the heat-dissipating fan, saving the cooling time of the large high-performance plastic packaging bag blowing machine. The mold can be cooled to room temperature within a few hours, reducing the problem of decomposition of plastic residual materials and carbonization on the inner side of the mold and the surface of the flow channel during the long cooling process, ensuring the processing quality of plastic packaging bags while extending the service life of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the installation structure of the cooling device of the present utility model (part of the mold shell and the heat-conducting plates of the upper and lower cooling components are cut away);

[0013] Figure 2 Schematic diagram of the structure of the lower cooling component of the present utility model (part of the mold shell and the heat-conducting plates of the upper and lower cooling components are cut away);

[0014] Figure 3 Schematic cross-sectional view of the structure of the cooling component for the present utility model, with some parts of the mold shell, the upper cooling component, and the heat conduction plates of the lower cooling component removed;

[0015] Figure 4 Schematic view of the connection structure of the inlet and outlet water pipes for the present utility model;

[0016] In the figure: 1. Blown film machine; 2. Extrusion feed pipe; 3. Fan; 4. Die head; 5. Air ring; 6. Mold; 7. Circulating water pump; 8. Lower cooling component; 9. Upper cooling component; 10. Connection plate; 11. Through hole; 12. Screw; 13. Nut; 14. Heat conduction plug board; 15. Flexible graphite heat conduction sheet; 16. Water pipe; 17. Bracket; 18. Cold row frame body; 19. Heat dissipation fin; 20. Heat dissipation fan. Specific embodiments

[0017] In order to make the technical means, creative features, achieved purposes and effects of the utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0018] In order to solve the problem that the cooling of the existing blown film machine mold usually takes 5 - 10 days. During this process, the inner and outer sides of the mold are at high temperature for a long time, which is likely to cause the decomposition of plastic residue, carbonization on the inner side and the surface of the flow channel of the mold, and the carbonized layer adheres to the surface of the mold flow channel, seriously affecting the quality of plastic packaging bag products and the service life of the mold. As Figure 1 shown, this application includes a blown film machine body 1. A fan 3 is connected to the outer side of the lower end of the blown film machine body 1. An extrusion feed pipe 2 is connected to the lower part of the blown film machine body 1 through a feed end. A mold 6 is provided at the upper end of the blown film machine body 1, and a die head 4 is installed inside the mold 6. An air ring 5 is provided at the central position of the die head 4;

[0019] As Figure 2 shown, an upper cooling component 9 is inserted into the upper periphery of the mold 6, and a lower cooling component 8 is sleeved on the lower periphery of the mold 6. Both the upper cooling component 9 and the lower cooling component 8 include disk-shaped heat conduction plates, and a number of annularly spaced connection plates 10 are provided at corresponding positions on the outer side surfaces of the heat conduction plates of the upper cooling component and the lower cooling component. Through holes 11 are formed on the surfaces of the connection plates 10. Screws 12 pass through the through holes 11 and are fixed by upper and lower nuts 13 to connect the upper cooling component 9 and the lower cooling component 8 together. A circular blind groove is provided on the upper surface of the heat conduction plate of the lower cooling component 8, and the blind groove is clamped on the outer periphery of the lower end surface of the mold 6;

[0020] As Figure 3As shown in the figure, a heat conduction insertion plate 14 is provided at the center position of the lower surface of the heat conduction plate of the upper cooling component 9. Heat conduction columns corresponding to the positions of the air outlet holes of the air ring 5 are processed on the lower surface of the heat conduction insertion plate 14, and the heat conduction columns are inserted into the air outlet holes of the air ring 5 in alignment. A ring-shaped flexible graphite heat conduction sheet 15 is provided on the lower surface of the heat conduction plate of the upper cooling component 9, and the flexible graphite heat conduction sheet 15 is inserted into the ring-shaped flow channel groove along the gap between the mold 6 and the die head 4;

[0021] As Figure 4 shown in the figure, a circulating water pump 7 is installed on the upper surface of the heat conduction plate of the upper cooling component 9. A number of circulating heat dissipation water pipes are arranged at intervals on the lower surface of the circulating water pump 7. The circulating heat dissipation water pipes are externally connected to the inlet and outlet water pipes 16, and the inlet and outlet water pipes 16 are connected to the inlet and outlet water interface positions at the upper end of the cold row frame body 18. A heat dissipation fin 19 is installed inside the cold row frame body 18, and a heat dissipation fan 20 is fixed on the cold row frame body 18 on the inner side of the heat dissipation fin 19. The cold row frame body 18 is arranged on the factory floor through a bracket 17;

[0022] Specifically, in order not to affect the normal operation of the blown film machine, the upper cooling component 9 is an integrally formed structure, and the lower cooling component 8 is an assembled structure with left and right halves, which is convenient for temporary disassembly and assembly. During actual cooling, all components are installed. The lower cooling component 8 is in a passive heat dissipation mode, and the heat on the lower end face of the mold 6 is led out through the heat conduction plate and exchanged with the surrounding air. The upper cooling component 9 is in an active heat dissipation mode. Through the heat conduction plate, the heat conduction insertion plate 14 and the flexible graphite heat conduction sheet 15 structures, the heat on the upper end face of the mold 6, the air ring 5 and the inside of the flow channel groove are respectively led out to the circulating heat dissipation water pipes, and the heat is introduced into the heat dissipation fins 19 of the cold row frame body 18 through the circulating heat dissipation water pipes. Finally, heat exchange is carried out with the air through the heat dissipation fan 20, saving the cooling time of the large high-performance plastic packaging bag blown film machine. The mold can be cooled to room temperature within a few hours, reducing the problem of decomposition of plastic residue and carbonization on the inner side surface of the mold 6 and the flow channel surface during the long-time cooling process, ensuring the processing quality of plastic packaging bags while extending the service life of the mold.

[0023] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, welding, etc. that are mature in the prior art. The machines, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0024] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A large-scale high-performance plastic packaging bag film blowing machine mold cooling device, comprising a film blowing machine body, the lower end of the film blowing machine body is connected to the outer side with a fan, the lower part of the film blowing machine body is connected to an extrusion feed pipe through a feed end, the upper end of the film blowing machine body is provided with a mold and a die head is installed inside the mold, and an air ring is provided at the center of the die head, characterized in that: An upper cooling component is inserted into the upper end of the mold periphery and a cooling component is sleeved on the lower end of the mold periphery. Both the upper cooling component and the cooling component include disc-shaped heat conducting plates, and corresponding positions of the outer sides of the heat conducting plates of the upper cooling component and the cooling component are provided with a plurality of annularly spaced connecting plates. Through holes are provided on the surfaces of the connecting plates, and screws are passed through the through holes and fixed together by upper and lower nuts.

2. According to claim 1, a large-scale high-performance plastic packaging bag film blowing machine mold cooling device is characterized in that: A circular blind groove is arranged on the upper surface of the heat conducting plate of the cooling component, and the blind groove is clamped on the outer periphery of the lower end surface of the mold.

3. According to claim 2, a large-scale high-performance plastic packaging bag film blowing machine mold cooling device is characterized in that: A heat-conducting plug plate is provided at the center of the lower surface of the heat-conducting plate of the upper cooling component, and a heat-conducting plug plate is processed on the lower surface of the heat-conducting plug plate with heat-conducting columns corresponding to the positions of the air ring outlet holes, and the heat-conducting columns are inserted into the air ring outlet holes in alignment. An annular flexible graphite heat-conducting sheet is provided on the lower surface of the heat-conducting plate of the upper cooling component, and the flexible graphite heat-conducting sheet is inserted into the annular flow channel groove along the gap between the mold and the die head.

4. The large-scale high-performance plastic packaging bag film blowing machine mold cooling device according to claim 3 is characterized by: A circulating water pump is installed on the upper surface of the heat conduction plate of the upper cooling component, and a plurality of circulating heat dissipation water pipes are arranged at intervals on the lower surface of the circulating water pump. The circulating heat dissipation water pipes are externally connected to inlet and outlet water pipes, and the inlet and outlet water pipes are connected to the inlet and outlet water interface positions at the upper end of the radiator frame. Heat dissipation fins are installed inside the radiator frame, and a cooling fan is fixed on the radiator frame inside the heat dissipation fins. The radiator frame is set on the factory floor through a bracket.

5. A large-scale high-performance plastic packaging bag film blowing machine mold cooling device according to claim 4, characterized in that: The circulating water pump and the cooling fan are externally connected to a control panel and a factory power supply. The upper cooling component is an integrated structure, and the lower cooling component is an assembled structure with left and right halves.

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