Plastic injection mold with high cooling forming efficiency

Abstract

The utility model relates to the technical field of plastic injection molds, and discloses a plastic injection mold with high cooling forming efficiency, which comprises a mold frame, an upper mold is slidably connected to the mold frame, a lower mold is fixedly connected to the inner bottom of the mold frame, and a cooling cavity is arranged in the lower mold. A cooling assembly used for cooling the plastic mold is arranged on the mold frame, and a recycling assembly used for recycling cooled water is further arranged on the mold frame. When the plastic injection mold with the high cooling forming efficiency is used, the heat transfer area of cooling water to a plastic product is increased, the cooling efficiency is improved, and the small temperature difference of each part of the plastic product can be ensured, so that uniform cooling is realized, and the service life of the plastic product is prolonged. Therefore, the problem of poor structural performance of the plastic product caused by uneven temperature can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic injection molds, in particular to a plastic injection mold with high cooling molding efficiency. Background Art

[0002] Plastic molds are tools used in the plastic processing industry to match plastic molding machines and give plastic products complete configurations and precise dimensions. Due to the wide variety of plastics and processing methods, the structures of plastic molding machines and plastic products vary in complexity, and the types and structures of plastic molds are also diverse.

[0003] After searching, a plastic injection mold with high cooling molding efficiency with publication number CN220242316U includes a lower mold plate, an upper mold plate and a cooling cavity, and also includes a heat conducting plate, a heat conducting sheet, a support plate and a bracket. The upper surface of the lower mold plate is provided with a lower mold cavity, and the bottom wall of the lower mold cavity is fixedly embedded with a heat conducting plate, and the bottom end of the heat conducting plate is fixedly connected with a plurality of groups of heat conducting sheets. The plastic injection mold with high cooling molding efficiency injects coolant into the cooling cavity through a cold injection pipe, and the heat of the plastic in the mold cavity is quickly conducted through the heat conducting plate and the heat conducting sheet, and the coolant in the cooling cavity is quickly cooled down, and the overall cooling efficiency is high. However, the above technical solution still has the following shortcomings when actually used:

[0004] This technical solution transfers the heat of the plastic mold to the cooling water by setting up a number of heat conducting plates, but the contact area between the heat conducting plates and the plastic mold is small, and the heat transferred to the cooling water by the heat conducting plates is limited, which limits the effective transfer of heat, resulting in low cooling efficiency of the plastic mold, which means that the plastic mold needs a long time to cool down to the required temperature, which not only reduces production efficiency but may also increase production costs. Secondly, as the cooling water flows from one side to the other, the water temperature gradually rises, which leads to a large difference in temperature on both sides of the plastic mold. This uneven temperature will cause inconsistent cooling speed of the plastic inside the mold. Uneven temperature control will not only affect the service life of the mold, but also directly affect the appearance and structural performance of the plastic product. The product may experience problems such as warping, deformation or excessive internal stress, affecting the quality and performance of the product.

[0005] Therefore, it is necessary to design a plastic injection mold with high cooling molding efficiency to solve the above problems. Utility Model Content

[0006] The utility model aims to solve the shortcomings in the prior art and provides a plastic injection mold with high cooling molding efficiency.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A plastic injection mold with high cooling molding efficiency comprises a mold frame, an upper mold is slidably connected to the mold frame, a lower mold is fixedly connected to the inner bottom of the mold frame, a cooling cavity is arranged inside the lower mold, a cooling component for cooling the plastic mold is arranged on the mold frame, and a recycling component for recycling cooled water is also arranged on the mold frame.

[0009] As a preferred technical solution of the utility model, the cooling component includes a connecting cavity arranged in the lower mold, and the connecting cavity is located below the cooling cavity. A plurality of connecting channels are also provided inside the lower mold, one end of the connecting channel is connected to the connecting cavity, and the other end of the connecting channel is connected to the interior of the cooling cavity. The cooling component also includes a driving member, and the driving member is used to drive the flow of cooling water.

[0010] As a preferred technical solution of the utility model, the driving part includes a cooling water storage tank fixed on the mold frame, the cooling water storage tank is fixedly connected to an electric telescopic rod, the interior of the cooling water storage tank is sealingly and slidably connected to a pressure plate, the telescopic end of the electric telescopic rod is fixed to the upper surface of the pressure plate, the cooling water storage tank is connected to a cooling pipe, the cooling pipe is connected to the connecting cavity, and a refrigeration plate is provided inside the cooling water storage tank.

[0011] As a preferred technical solution of the utility model, the recovery component includes a recovery tank fixedly connected to the mold frame, the recovery tank is connected to a recovery pipe, the lower mold is provided with a main pipe, the main pipe is connected to the recovery pipe, the main pipe is connected to a plurality of branch pipes, and all of the branch pipes are connected to the cooling chamber.

[0012] As a preferred technical solution of the utility model, a connecting cover is fixedly connected to the inner side of the cooling water storage tank, spiral blades are fixed inside the connecting cover, the connecting cover is connected to the cooling pipe, and the refrigeration plate is fixedly sleeved on the connecting cover.

[0013] As a preferred technical solution of the utility model, the upper mold and the lower mold are both made of aluminum alloy.

[0014] The utility model has the following beneficial effects:

[0015] 1. Small temperature difference and uniform cooling: By simultaneously and dispersedly pressing cooling water into the cooling chamber through dispersed connecting channels, it can ensure that the temperature difference of various parts of the plastic product is small, thereby achieving uniform cooling, which helps to prevent the poor structural performance of plastic products caused by uneven temperature, such as warping, stress concentration, etc., and improve product quality;

[0016] 2. Improve cooling efficiency: The cooling cavity surrounds the groove of the lower mold, and the lower mold is made of aluminum alloy. This design increases the area of ​​heat transfer from cooling water to plastic products and improves cooling efficiency;

[0017] 3. Energy recycling: Use cooling water that carries the heat of the previous plastic product to re-enter the cooling chamber, which can transfer the heat to the lower mold, thereby reducing the temperature difference between the mold and the molten plastic. In this way, during injection molding, the phenomenon of the molten plastic cooling and hardening locally too quickly after entering the mold is avoided, thereby ensuring the overall quality of the plastic product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a plastic injection mold with high cooling molding efficiency proposed by the utility model;

[0019] Figure 2 is a schematic diagram of a three-dimensional cross-sectional structure of a lower mold;

[0020] Figure 3 for Figure 2 A magnified view of the structure at A;

[0021] Figure 4 Schematic diagram of the internal structure of the cooling water storage tank.

[0022] In the figure: 1 mold frame, 2 upper mold, 3 lower mold, 4 cooling cavity, 5 connecting channel, 6 connecting cavity, 7 cooling pipe, 8 cooling water storage tank, 9 electric telescopic rod, 10 pressing plate, 11 refrigeration plate, 12 recovery tank, 13 recovery pipe, 14 main pipe, 15 branch pipe, 16 connecting cover, 17 spiral blade. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] Reference Figure 1-4 A plastic injection mold with high cooling molding efficiency includes a mold frame 1, an upper mold 2 is slidably connected to the mold frame 1, a lower mold 3 is fixedly connected to the inner bottom of the mold frame 1, a cooling cavity 4 is provided inside the lower mold 3, and the cooling cavity 4 can wrap the groove of the lower mold 3, so that the cooling area of ​​the plastic product by cooling water can be increased and the cooling efficiency can be improved. A cooling component for cooling the plastic mold is provided on the mold frame 1, and a recycling component for recycling the cooled water is also provided on the mold frame 1.

[0025] Reference Figure 2The cooling assembly includes a connecting cavity 6 arranged in the lower mold 3, and the connecting cavity 6 is located below the cooling cavity 4. A plurality of connecting channels 5 are also arranged inside the lower mold 3, and one end of the connecting channel 5 is connected to the connecting cavity 6. By setting up dispersed connecting channels 5, cooling water can enter the cooling cavity 4 through a plurality of connecting channels 5 at the same time, which can reduce the temperature difference in the cooling cavity 4, thereby making the temperature difference of various parts of the plastic product smaller, thereby ensuring the structural stability of the plastic product. The other end of the connecting channel 5 is connected to the inside of the cooling cavity 4. The cooling assembly also includes a driving member, which is used to drive the flow of cooling water.

[0026] Reference Figure 1 and Figure 4 The driving part includes a cooling water storage tank 8 fixed on the mold frame 1, an electric telescopic rod 9 is fixedly connected to the cooling water storage tank 8, a pressure plate 10 is sealed and slidably connected inside the cooling water storage tank 8, the telescopic end of the electric telescopic rod 9 is fixed to the upper surface of the pressure plate 10, a cooling pipe 7 is connected to the cooling water storage tank 8, the cooling pipe 7 is connected to the connecting cavity 6, and a refrigeration plate 11 is provided inside the cooling water storage tank 8.

[0027] Reference Figure 1 and Figure 2 The recovery component includes a recovery tank 12 fixedly connected to the mold frame 1, and a recovery pipe 13 is connected to the recovery tank 12. A main pipe 14 is provided on the lower mold 3. The main pipe 14 is connected to the recovery pipe 13, and a plurality of branch pipes 15 are connected to the main pipe 14. All the branch pipes 15 are connected to the cooling chamber 4. By setting a plurality of branch pipes 15, the heated cooling water can be squeezed and can enter the branch pipes 15 at the same time in a dispersed manner, so that the temperature difference of the plastic is small, and the uniformity of the plastic production is ensured. By using the recovery tank 12, the heated cooling water can be recovered and returned to the cooling chamber 4 before the next injection molding operation, so that the temperature difference between the cooling chamber 4 and the molten plastic can be reduced, and the molten plastic can be prevented from hardening under the influence of the cooling chamber 4.

[0028] Reference Figure 4 A connecting cover 16 is fixedly connected to the inner side of the cooling water storage tank 8, and a spiral blade 17 is fixed inside the connecting cover 16. The connecting cover 16 is connected to the cooling pipe 7. The refrigeration plate 11 is fixedly sleeved on the connecting cover 16. The spiral blade 17 can increase the distance that the cooling water flows through the connecting cover 16, so that the refrigeration plate 11 can fully cool the cooling water and ensure the cooling effect of the cooling water on the plastic products.

[0029] Reference Figure 1 The upper mold 2 and the lower mold 3 are both made of aluminum alloy, which can ensure the hardness of the lower mold 3 and the upper mold 2 while ensuring the heat dissipation performance of the two, thereby improving the cooling efficiency of the plastic product.

[0030] The specific working principle of the utility model is as follows:

[0031] When the injection molding is completed and cooling is required, the electric telescopic rod 9 is started, and the telescopic end of the electric telescopic rod 9 is extended downward to make the pressing plate 10 press downward, and the pressing plate 10 can press the cooling water into the cooling pipe 7 and then into the connecting cavity 6. When the connecting cavity 6 is completely filled with cooling water, as the pressing plate 10 continues to press downward, the cooling water in the connecting cavity 6 will enter the cooling cavity 4 through a plurality of connecting channels 5. Since a plurality of dispersed connecting channels 5 are provided, the cooling water will enter the cooling cavity 4 in a dispersed manner at the same time, so that the temperature difference of various parts of the plastic product is small and the cooling speed is consistent, thereby preventing the poor structural performance of the plastic product due to uneven temperature. Problem, secondly, the cooling cavity 4 surrounds the groove of the lower mold 3, and the lower mold 3 is made of aluminum alloy material, which increases the area of ​​heat transfer of cooling water to the plastic product and improves the cooling efficiency. It is worth mentioning that when the plastic is thicker and the heat is higher, the staff can continue to control the telescopic end of the electric telescopic rod 9 to press down, so that the pressing plate 10 continues to press the cooling water into the cooling cavity 4. The newly entered cooling water can squeeze out the heated cooling water, so that the plastic product can be continuously and evenly cooled, ensuring the production quality of the plastic, and enabling the device to flexibly adjust the cooling times according to the size and thickness of the plastic product, ensuring the practicality of the device;

[0032] Furthermore, as the pressing plate 10 is continuously pressed downward, the cooling water can be pressed into the cooling chamber 4, and the cooling water originally located in the cooling chamber 4 after being heated can be squeezed into several branch pipes 15, and then enter the recovery tank 12 through the main pipe 14 and the recovery pipe 13. When the next plastic injection molding operation is carried out after the cooling is completed, the staff controls the telescopic end of the electric telescopic rod 9 to contract, so that the pressing plate 10 can move up and absorb the cooling water in the cooling chamber 4 back into the cooling water storage tank 8. At this time, the water in the recovery tank 12 can return to the cooling chamber 4. Since the water carries the heat of the previous plastic product, the heat will be transferred to the lower mold 3, which can reduce the temperature difference between the lower mold 3 and the molten plastic, so that the molten plastic will be locally cooled and hardened after entering the lower mold 3 during injection molding, thereby improving the quality of the plastic product.

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic injection mold with high cooling molding efficiency, comprising a mold frame (1), characterized in that: An upper mold (2) is slidably connected to the mold frame (1), a lower mold (3) is fixedly connected to the inner bottom of the mold frame (1), a cooling cavity (4) is provided inside the lower mold (3), a cooling component for cooling the plastic mold is provided on the mold frame (1), and a recycling component for recycling cooled water is also provided on the mold frame (1); The cooling assembly comprises a connecting cavity (6) arranged in the lower mold (3), the connecting cavity (6) being located below the cooling cavity (4), and a plurality of connecting channels (5) being arranged inside the lower mold (3), one end of the connecting channel (5) being connected to the connecting cavity (6), and the other end of the connecting channel (5) being connected to the inside of the cooling cavity (4), and the cooling assembly further comprises a driving member, the driving member being used to drive the flow of cooling water; The driving member comprises a cooling water storage tank (8) fixed on the mold frame (1), an electric telescopic rod (9) is fixedly connected to the cooling water storage tank (8), a pressing plate (10) is sealed and slidably connected inside the cooling water storage tank (8), the telescopic end of the electric telescopic rod (9) is fixed to the upper surface of the pressing plate (10), a cooling pipe (7) is connected to the cooling water storage tank (8), the cooling pipe (7) is connected to the connecting cavity (6), and a refrigeration plate (11) is provided inside the cooling water storage tank (8); The recovery component comprises a recovery tank (12) fixedly connected to the mold frame (1), the recovery tank (12) being connected to a recovery pipe (13), the lower mold (3) being provided with a main pipe (14), the main pipe (14) being connected to the recovery pipe (13), the main pipe (14) being connected to a plurality of branch pipes (15), and all of the branch pipes (15) being connected to the cooling chamber (4).

2. A plastic injection mold with high cooling molding efficiency according to claim 1, characterized in that: A connecting hood (16) is fixedly connected to the inner side of the cooling water storage tank (8), a spiral blade (17) is fixed inside the connecting hood (16), the connecting hood (16) is connected to the cooling pipe (7), and the refrigeration fin (11) is fixedly sleeved on the connecting hood (16).

3. A plastic injection mold with high cooling molding efficiency according to claim 1, characterized in that: The upper mold (2) and the lower mold (3) are both made of aluminum alloy.

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