Highly efficient cooling of plastic packaging container injection molds

Abstract

The utility model is suitable for the technical field of plastic bucket processing, provides a kind of high -efficient cooling's plastic packaging container injection mold, including upper die holder, lower die holder, the mould assembly of being arranged between upper die holder and lower die holder and the cooling assembly of being arranged in mould assembly inside, the spiral channel is formed between the upper die and lower die, the cooling assembly includes the spiral elbow pipe of being arranged in spiral channel inside, the radiating fin of being arranged around spiral elbow pipe and respectively connect in the liquid inlet hose and liquid outlet hose of spiral elbow pipe two ends.The device solves the problem that the contact area of cooling water and mould is limited and cooling water can only contact mould through guide plate to transfer heat, which causes insufficient cooling of mould, so that cooling liquid flows along the spiral of mould, increases the flow path in the cooling process, and the fin is additionally provided on the surface of spiral elbow pipe, which further increases the heat transfer in the cooling liquid flow process and accelerates the cooling effect.

Description

Technical Field

[0001] This utility model relates to the field of plastic bucket processing technology, and more specifically, it relates to an injection mold for a high-efficiency cooling plastic packaging container. Background Technology

[0002] Plastic drums are mostly made of polyethylene, polypropylene, and other plastics through blow molding and injection molding. They are widely used for the storage and transportation of various liquids and have excellent properties for packaging special hazardous materials. They are characterized by being unbreakable, rust-free, and lightweight, and also have excellent oil and strong corrosion resistance. They are often used for packaging hazardous materials that require heat preservation, moisture protection, pressure resistance, and corrosion resistance. In the processing of plastic drums, injection molding is usually the main method. During injection molding, the plastic drums need to be cooled to ensure the molding quality and performance of the drums.

[0003] Patent CN222328963U discloses an injection mold for processing plastic buckets that can be cooled quickly. By setting a guide plate, the cooling water can be guided to flow more evenly inside the injection mold, thereby achieving more uniform cooling. The design of the guide plate allows the cooling water to be mixed evenly and move along a set path, ensuring uniform heat dissipation, reducing deformation and internal stress in the molding of plastic buckets, and ensuring the dimensional accuracy and appearance quality of the product.

[0004] While the aforementioned device can cool the mold by circulating cooling water inside, the water flows in a straight line, resulting in a short flow path and limited contact area between the water and the mold. This leads to insufficient cooling and a poor cooling effect. Furthermore, the cooling water can only transfer heat to the mold through guide plates, which also results in inadequate heat transfer during the water flow, further contributing to insufficient mold cooling. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly efficient cooling injection mold for plastic packaging containers, which allows the coolant to flow spirally along the mold, increasing the flow path during the cooling process. Furthermore, fins are added to the surface of the spiral bend to further enhance heat transfer during the coolant flow, thereby accelerating cooling.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A high-efficiency cooling injection mold for plastic packaging containers includes an upper mold base, a lower mold base, a mold assembly disposed between the upper mold base and the lower mold base, and a cooling assembly disposed inside the mold assembly. The mold assembly includes an upper mold, a lower mold, and a molding part disposed between the upper mold and the lower mold. The molding part has a spiral channel inside. The cooling assembly includes a spiral bend disposed inside the spiral channel, heat dissipation fins surrounding the spiral bend, and an inlet hose and an outlet hose respectively connected to both ends of the spiral bend.

[0008] The present invention is further configured such that: an inlet channel and an outlet channel are provided through the interior of the lower mold, and the inlet channel and the outlet channel are respectively connected to the spiral channel.

[0009] The present invention is further configured such that: the liquid inlet channel is located at the lower part of the lower mold, and the liquid outlet channel is located at the upper part of the lower mold.

[0010] The present invention is further configured such that: the top of the molded part is connected to the top of the upper mold, and a cavity for injection molding of the plastic bucket is formed inside the molded part.

[0011] The present invention is further configured such that: the inlet hose is located at the lower part of the spiral bend and communicates with the interior of the spiral bend, and the outlet hose is located at the upper part of the spiral bend and communicates with the interior of the spiral bend.

[0012] The present invention is further configured such that: the heat dissipation fins are arranged along the spiral direction of the spiral bend, and the heat dissipation fins are connected to the outer wall of the spiral bend.

[0013] The present invention is further configured such that: the upper mold base includes an injection plate and a structural plate that abuts against the mold assembly; the injection plate has an injection port that communicates with the interior of the mold assembly.

[0014] By adopting the above technical solution, the coolant can be injected through the inlet hose and enter the spiral bend tube. During the flow along the spiral direction of the spiral bend tube, the coolant exchanges heat with the heat dissipation fins on the spiral bend tube and the molded part to complete the cooling, and finally cools the plastic bucket formed inside the molded part.

[0015] The present invention is further configured such that: the lower mold base includes a support base and a buffer seat disposed on the top of the support base, the support base is provided with a plurality of support pins, and the support pins extend upward into the interior of the buffer seat.

[0016] The beneficial effects of this utility model are:

[0017] Low-temperature coolant is injected into the spiral bend through the inlet hose. Heat exchange occurs through the spiral bend, which effectively extends the flow path of the coolant. Furthermore, the heat exchange during the flow of the coolant is increased by the heat dissipation fins, thereby cooling the molded part and improving the cooling effect on the plastic bucket formed inside the molded part, ensuring sufficient cooling. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the injection mold for the high-efficiency cooling plastic packaging container of this utility model.

[0020] Figure 2 for Figure 1 The left view shown.

[0021] Figure 3 for Figure 1 The exploded view shown.

[0022] Figure 4 for Figure 3 The diagram shows the structure of the upper mold base.

[0023] Figure 5 For along Figure 2 A cross-sectional view showing section line AA.

[0024] Figure 6 for Figure 5 The diagram shows the structure of the cooling component and the molded part.

[0025] Figure 7 for Figure 6 The top view shown.

[0026] Explanation of reference numerals in the attached drawings: 1. Upper mold base; 11. Injection plate; 12. Injection port; 13. Structural plate; 14. Buffer spring; 15. Positioning pin;

[0027] 2. Lower mold base; 21. Support base; 22. Structural cavity; 23. Buffer seat; 24. Support pin; 25. Buffer block; 26. Positioning hole; 27. Slide groove;

[0028] 3. Mold components; 31. Upper mold; 32. Molded part; 33. Lower mold; 34. Liquid inlet channel; 35. Liquid outlet channel; 36. Spiral channel; 37. Sliding bar;

[0029] 4. Cooling assembly; 41. Inlet hose; 42. Spiral bend; 43. Heat dissipation fins; 431. Spiral section; 432. Parallel section; 44. Outlet hose. Detailed Implementation

[0030] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will now be described in detail with reference to the accompanying drawings. This drawing is a simplified schematic diagram, illustrating only the basic aspects of the present utility model, and therefore only shows the components relevant to the present utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0031] Please refer to Figure 1-3 A high-efficiency cooling injection mold for plastic packaging containers includes an upper mold base 1, a lower mold base 2, a mold assembly 3 disposed between the upper mold base 1 and the lower mold base 2, and a cooling assembly 4 disposed inside the mold assembly 3. Molten plastic is poured into the mold assembly 3 through the upper mold base 1, and after cooling and molding, a plastic bucket is formed. During the cooling process, coolant circulates in the cooling assembly 4 to exchange heat and cool the mold.

[0032] Please refer to Figure 1-5 The upper mold base 1 includes an injection plate 11 and a structural plate 13 that abuts against the mold assembly 3. The injection plate 11 and the structural plate 13 are fixedly connected. An injection port 12 is provided on the injection plate 11, which communicates with the interior of the mold assembly 3, allowing molten plastic to be injected into the mold assembly 3 through the injection port 12. The structural plate 13 is inclined in the middle, and multiple buffer springs 14 are provided on both sides of the structural plate 13. The shape of the middle part of the structural plate 13 is adapted to the mold assembly 3, allowing it to fit snugly against the mold assembly 3. Multiple positioning pins 15 are provided on both sides of the structural plate 13, spaced apart from the buffer springs 14. One end of each positioning pin 15 is fixedly connected to the structural plate 13, and the other end can be inserted into the lower mold base 2 to complete the positioning between the upper mold base 1 and the lower mold base 2.

[0033] Please refer to Figure 1-3 and Figure 5The lower mold base 2 includes a support base 21 and a buffer seat 23 disposed on top of the support base 21. The support base 21 has a structural cavity 22, which reduces the weight of the lower mold base 2. The top two ends of the support base 21 are fixedly connected to the buffer seat 23. Two buffer blocks 25 are symmetrically arranged on the top of the buffer seat 23 and are fixedly connected to it. A slide bar 27 is provided on the side of the buffer block 25 near the center of the buffer seat 23. A positioning hole 26 is provided on the buffer block 25, extending downwards into the buffer seat 23. A positioning pin 15 can be inserted into the positioning hole 26 to position the upper mold base 1 and the lower mold base 2. One end of the buffer spring 14 is fixedly connected to the structural plate 13, and the other end can abut against the buffer block 25. During high-pressure injection molding and rapid opening and closing, the mold generates significant impact forces. The buffer spring 14 and the buffer block 25 can buffer and dampen shocks, reducing impact between mold components and extending the mold's service life. Multiple support pins 24 are provided on the support base 21. The support pins 24 are located inside the structural cavity 22 and are fixedly connected to the support base 21 at their bottom. The support pins 24 extend upward into the buffer seat 23 and are interference-fitted with the buffer seat 23. During the injection molding process, molten plastic is injected under high pressure, which generates a large lateral force. Through the interference fit between the support pins 24 and the buffer seat 23, the lateral load can be shared, preventing the top of the support base 21 or the mold assembly 3 from deforming due to uneven force, thereby improving the overall rigidity of the mold.

[0034] Please refer to Figure 1-3 and Figure 5The mold assembly 3 includes an upper mold 31, a lower mold 33, and a molding part 32 disposed between the upper mold 31 and the lower mold 33. The upper mold 31 and the lower mold 33 are fixedly connected, the lower mold 33 is mounted on a buffer seat 23, and the top of the molding part 32 is connected to the top of the upper mold 31. The molding part 32 is a cylindrical structure with an open top, and a cavity is formed inside the molding part 32 for injection molding of a plastic bucket. Specifically, the molding part 32 includes a mold core and a sleeve. The mold core is fixedly connected to the bottom of the injection plate 11, and the sleeve is connected to the top of the upper mold 31. When the upper mold base 1 is inserted downward into the lower mold base 2, the mold core is inserted into the sleeve, and a cavity for injection molding is formed between the sleeve and the mold core. The cavity inside the molding part 32 communicates with the injection port 12, and molten plastic can enter the cavity inside the molding part 32 through the injection port 12. After the molten plastic is injected into the cavity inside the molding part 32, it cools and solidifies to form a plastic packaging container. A spiral channel 36 is formed inside the molded part 32, located within the sleeve of the molded part 32. A liquid inlet channel 34 and a liquid outlet channel 35 are formed through the lower mold 33, respectively, and are connected to the spiral channel 36. The liquid inlet channel 34 is located at the lower part of the lower mold 33, and the liquid outlet channel 35 is located at the upper part of the lower mold 33. Sliding strips 37 are provided on both sides of the lower mold 33. The shape of the sliding strips 37 matches the shape of the sliding grooves 27. Through the cooperation between the sliding strips 37 and the sliding grooves 27, the mold assembly 3 can be inserted between the two buffer blocks 25, completing the installation of the mold assembly 3. It should be noted that a limiting block is provided at one end of the sliding groove 27 on the two buffer blocks 25, which can limit the mold assembly 3, thereby fixing the mold assembly 3 onto the lower mold base 2.

[0035] Please refer to Figure 5-7The cooling assembly 4 includes a spiral bend 42 disposed inside a spiral channel 36, heat dissipation fins 43 surrounding the spiral bend 42, and an inlet hose 41 and an outlet hose 44 respectively connected to both ends of the spiral bend 42. The inner diameter of the spiral bend 42 is adapted to the outer diameter of the molded part 32, and the spiral height of the spiral bend 42 is adapted to the height of the spiral channel 36. The spiral bend 42 is disposed around the molded part 32 and located inside the spiral channel 36. Compared with traditional cooling devices, the spiral bend 42 can effectively extend the flow path of the coolant and increase the heat exchange during the coolant flow process. The inlet hose 41 is located at the lower part of the spiral bend 42 and communicates with the interior of the spiral bend 42, while the outlet hose 44 is located at the upper part of the spiral bend 42 and communicates with the interior of the spiral bend 42. The inlet hose 41 is disposed inside the inlet channel 34, and the outlet hose 44 is disposed inside the outlet channel 35. It should be noted that a metal seal with an O-ring is provided at the connection between the inlet hose 41 and the inlet channel 34 to achieve a seal between the inlet hose 41 and the inlet channel 34. Similarly, a metal seal with an O-ring is provided at the connection between the outlet hose 44 and the outlet channel 35 to achieve a seal between the outlet hose 44 and the outlet channel 35. In other embodiments, sealing can also be achieved through specific bayonet joints, threads, or other mechanical structures, which are not specifically limited herein. The heat dissipation fins 43 are arranged along the spiral direction of the spiral bend 42 and are connected to the outer wall of the spiral bend 42. The heat dissipation fins 43 include a spiral portion 431 arranged along the spiral direction of the spiral bend 42 and a parallel portion 432 arranged along the cross-sectional direction of the vertical spiral bend 42. The spiral portion 431 and the parallel portion 432 are smoothly connected, and two adjacent parallel portions 432 are equidistantly spaced. By adding heat dissipation fins 43 to the spiral bend 42, the heat exchange during the coolant flow can be further enhanced by the heat dissipation fins 43, on top of the heat exchange already occurring through the spiral bend 42, thus improving the cooling effect. The coolant can be injected through the inlet hose 41 and enters the spiral bend 42. During its flow along the spiral direction of the spiral bend 42, it exchanges heat with the molded part 32 through the spiral bend 42 and the heat dissipation fins 43, ultimately cooling the plastic bucket formed inside the molded part 32.

[0036] Specifically, during injection molding, molten plastic is injected into the internal cavity of the molded part 32 through the injection port 12. After cooling, it is molded into a plastic bucket. During the cooling process of the plastic bucket, low-temperature coolant is injected through the inlet hose 41 and enters the spiral bend 42. Compared with traditional cooling devices, the spiral bend 42 can effectively extend the flow path of the coolant and increase the heat exchange during the flow process. As the low-temperature coolant flows along the spiral bend 42 in the spiral direction, it exchanges heat with the molded part 32 through the spiral bend 42 and its heat dissipation fins 43 to achieve cooling. By adding heat dissipation fins 43 to the spiral bend 42, the heat exchange during the flow process of the coolant can be further increased on the basis of the heat exchange through the spiral bend 42, thereby improving the cooling effect. Ultimately, this achieves the purpose of further cooling the plastic bucket formed inside the molded part 32.

[0037] Low-temperature coolant is injected into the spiral bend 42 through the inlet hose 41. Heat exchange occurs through the spiral bend 42. By effectively extending the flow path of the coolant, the heat exchange during the flow of the coolant is further increased by the heat dissipation fins 43, thereby cooling the molded part 32 and improving the cooling effect on the plastic bucket formed inside the molded part 32, ensuring sufficient cooling.

[0038] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A high-efficiency cooling injection mold for plastic packaging containers, characterized in that: The mold assembly includes an upper mold base (1), a lower mold base (2), a mold assembly (3) disposed between the upper mold base (1) and the lower mold base (2), and a cooling assembly (4) disposed inside the mold assembly (3). The mold assembly (3) includes an upper mold (31) and a lower mold (33) connected to each other, and a molding part (32) disposed between the upper mold (31) and the lower mold (33). The molding part (32) has a spiral channel (36) inside. The cooling assembly (4) includes a spiral bend (42) disposed inside the spiral channel (36), heat dissipation fins (43) surrounding the spiral bend (42), and liquid inlet hose (41) and liquid outlet hose (44) respectively connected to the two ends of the spiral bend (42).

2. The high-efficiency cooling injection mold for plastic packaging containers according to claim 1, characterized in that: The lower mold (33) has a liquid inlet channel (34) and a liquid outlet channel (35) running through it. The liquid inlet channel (34) and the liquid outlet channel (35) are respectively connected to the spiral channel (36).

3. The high-efficiency cooling injection mold for plastic packaging containers according to claim 2, characterized in that: The liquid inlet channel (34) is located at the lower part of the lower mold (33), and the liquid outlet channel (35) is located at the upper part of the lower mold (33).

4. The high-efficiency cooling injection mold for plastic packaging containers according to claim 3, characterized in that: The top of the molded part (32) is connected to the top of the upper mold (31), and a cavity for injection molding of the plastic bucket is formed inside the molded part (32).

5. The high-efficiency cooling injection mold for plastic packaging containers according to claim 1, characterized in that: The inlet hose (41) is located at the lower part of the spiral bend (42) and communicates with the inside of the spiral bend (42), while the outlet hose (44) is located at the upper part of the spiral bend (42) and communicates with the inside of the spiral bend (42).

6. The high-efficiency cooling injection mold for a plastic packaging container according to claim 5, characterized in that: The heat dissipation fins (43) are arranged along the spiral direction of the spiral bend (42), and the heat dissipation fins (43) are connected to the outer wall of the spiral bend (42).

7. The high-efficiency cooling injection mold for plastic packaging containers according to claim 1, characterized in that: The upper mold base (1) includes an injection plate (11) and a structural plate (13) that abuts against the mold assembly (3). An injection port (12) is provided on the injection plate (11), and the injection port (12) is connected to the interior of the mold assembly (3).

8. The high-efficiency cooling injection mold for plastic packaging containers according to claim 1, characterized in that: The lower mold base (2) includes a support base (21) and a buffer seat (23) disposed on the top of the support base (21). The support base (21) is provided with a plurality of support pins (24), and the support pins (24) extend upward into the interior of the buffer seat (23).

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