Injection mold structure for umbrella-rib-shaped product made of PP (polypropylene) material

Abstract

The utility model relates to the technical field of injection molding, and discloses an injection mold structure for umbrella-rib-shaped products made of PP (polypropylene) materials, which comprises a lower mold and an upper mold arranged on the right side of the lower mold. According to the injection mold structure for the umbrella-rib-shaped product made of the PP material, a segmented injection technology is adopted, two groups of hot runners are arranged in each group of independent cavities, the injection process is divided into a plurality of stages, the injection speed and pressure are adjusted according to filling requirements of different areas, uniform flowing of the PP material in a complex umbrella rib structure can be ensured, and the production efficiency is improved. A plurality of small runners are arranged in the mold, and particularly the tiny runner design is adopted at the detail part of the umbrella rib, so that the PP material can uniformly flow in a complex cavity, and the phenomenon of unsmooth flow or incomplete injection molding is avoided; the problems that a traditional mold is poor in fluidity, incomplete in filling, long in forming period and prone to buckling deformation in the injection molding process are solved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to an injection mold structure for umbrella-shaped products made of PP material. Background Technology

[0002] Umbrella-shaped products are typically manufactured using injection molding technology. Due to their complex shape and structure, the injection molding process demands high standards in mold design and injection technology. PP (polypropylene) material is widely used in umbrella rib manufacturing due to its good chemical stability, high rigidity, and toughness. However, traditional molds suffer from problems such as poor flowability, incomplete filling, long molding cycles, and warpage during injection molding. Optimizing mold structure, improving injection efficiency, reducing injection defects, and ensuring the dimensional accuracy of umbrella-shaped products are currently key technical challenges in the injection molding field.

[0003] Now, a novel umbrella-shaped product injection mold structure made of PP material is proposed to address the above-mentioned shortcomings. Utility Model Content

[0004] The purpose of this utility model is to provide an injection mold structure for umbrella-shaped products made of PP material, so as to solve the problems of poor fluidity, incomplete filling, long molding cycle and warping deformation of traditional molds mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a PP material umbrella-shaped product injection mold structure, including a lower mold and an upper mold, wherein the upper mold is provided on the right side of the lower mold, and cavities are respectively provided inside the two ends of the right side of the lower mold, and hot runners are respectively fixed inside the two ends of the right side of the upper mold, a main pipe is provided on the right side of the upper mold, and a branch pipe is fixed on the left side of the main pipe, and multiple sets of cavities are respectively provided inside the two ends of the right side of the lower mold, guide rods are respectively fixed at the four corners of the right side of the lower mold, and inner holes are respectively provided inside the four corners of the left side of the upper mold, with the guide rods penetrating the interior of the inner holes, and a controller is provided at the bottom of the front end of the lower mold.

[0006] As a further technical solution of this utility model, the hot runner penetrates the interior of the upper mold, and the left side of the branch pipe is fixedly connected to the right side of the hot runner.

[0007] As a further technical solution of this utility model, the branch pipes are provided in multiple sets at both ends of the left side of the main pipe, and the hot runners are provided in multiple sets at both ends of the right side of the inner hole.

[0008] As a further technical solution of this utility model, the upper and lower ends of the left side of the multiple sets of cavities are respectively provided with mounting grooves, and heating strips are fixed inside the mounting grooves. The upper and lower ends of the right side of the lower mold are respectively provided with mounting cavities, and temperature sensors are installed inside the mounting cavities.

[0009] As a further technical solution of this utility model, a cooling channel is provided at the front end of the left side inside the lower mold, a liquid inlet is fixed at the front end of the top of the lower mold, a liquid outlet is fixed at the front end of the bottom of the lower mold, a cooling channel is provided at the rear end of the left side inside the lower mold, a liquid inlet is fixed at the rear end of the top of the lower mold, and a liquid outlet is fixed at the rear end of the bottom of the lower mold.

[0010] As a further technical solution of this utility model, the first liquid inlet and the first liquid outlet are respectively connected to the interior of the first cooling channel, and the second liquid inlet and the second liquid outlet are respectively connected to the interior of the second cooling channel.

[0011] As a further technical solution of this utility model, a mounting bracket is installed and fixed on the left side of the lower mold, and a connecting plate is provided on the left side inside the mounting bracket. A second cylinder is installed and fixed on the top of the left side of the mounting bracket, and a first cylinder is installed and fixed on the bottom of the left side of the mounting bracket. Ejector pins are fixed at both ends on the right side of the connecting plate, and an ejector hole is opened inside the left side of the cavity.

[0012] As a further technical solution of this utility model, the output ends on the right side of cylinder one and cylinder two respectively penetrate through the interior of the left side of the mounting bracket and are fixedly connected to the left side of the connecting plate. Multiple sets of ejector pins are respectively provided at both ends of the right side of the connecting plate, and the right side of the ejector pin penetrates through the interior of the ejection hole.

[0013] Compared with the prior art, the beneficial effects of this utility model are: the umbrella-shaped product injection mold structure of this PP material not only realizes segmented injection technology and precision flow channel design, but also realizes the setting of multi-layer cooling channels in key parts to avoid warping deformation caused by uneven cooling, and pneumatically assisted ejection, effectively avoiding product deformation caused by uneven ejection.

[0014] (1) By setting up a lower mold, upper mold, cavity, hot runner, branch pipe, main pipe, mounting groove, heating strip, temperature sensor and mounting cavity, the mold is equipped with segmented injection technology. Each set of individual cavities is equipped with two sets of hot runners, dividing the injection process into multiple stages. The injection speed and pressure are adjusted according to the filling requirements of different areas, which can ensure the uniform flow of PP material in the complex umbrella structure and avoid defects such as bubbles and shrinkage. Multiple small runners are set inside the mold, especially in the details of the umbrella ribs, using micro-runner design to ensure that the PP material can flow evenly in the complex cavity and avoid the phenomenon of poor flow or incomplete injection. At the same time, a precise hot runner design is adopted to optimize the distribution of the runners, making the hot runners more refined, reducing the cooling time and temperature difference of the PP material, improving fluidity, and ensuring the smooth filling of the umbrella rib-shaped product. By using local heating elements and heating strips at the umbrella rib connection, it can be ensured that the material can be smoothly filled into the small parts of the mold and improve the molding accuracy of the product.

[0015] (2) By setting up a lower mold, an upper mold, a liquid inlet 1, a cooling channel 1, a liquid inlet 2, a cooling channel 2, a liquid outlet 2, and a liquid outlet 1, more uniform cooling can be achieved in key parts of the umbrella-shaped product inside the mold, especially in areas with long channels or thin walls, by setting up multi-layer cooling channels, liquid inlet 2, and cooling channel 1. By precisely controlling the coolant flow rate, uneven cooling and warping deformation can be avoided, improving the stability of the molded product. By setting up a temperature sensor and using a temperature control module, precise temperature control can be performed on each area of ​​the mold. By monitoring the mold temperature in real time, material flow obstruction caused by excessively high or low temperatures during the cooling process can be avoided, reducing product warping and shrinkage.

[0016] (3) By setting up a lower mold, mounting bracket, cylinder one, connecting plate, cylinder two, ejector pin, cavity and ejection hole, multiple ejector pins are set inside the mold to evenly eject the molded umbrella rib product from the mold, avoiding product deformation or damage caused by uneven ejection. The pneumatic ejection method of cylinder one and cylinder two can reduce the ejection force and avoid product deformation caused by excessive ejection force. At the same time, the internal flow channel, gate and ejection part of the mold are made of hardened steel high wear-resistant material, which can ensure the high durability of the mold in long-term use and reduce the frequency of maintenance. Attached Figure Description

[0017] Figure 1 This is a frontal cross-sectional view of the present invention.

[0018] Figure 2 This is a side view of the cavity structure of this utility model;

[0019] Figure 3 This is a side view of the upper mold structure of this utility model;

[0020] Figure 4 This is a partial sectional view of the lower mold of this utility model.

[0021] In the diagram: 1. Lower mold; 2. Mounting bracket; 3. Cylinder 1; 4. Connecting plate; 5. Cylinder 2; 6. Ejector pin; 7. Cavity; 8. Guide rod; 9. Inner hole; 10. Upper mold; 11. Hot runner; 12. Branch pipe; 13. Main pipe; 14. Ejector hole; 15. Liquid inlet 1; 16. Cooling runner 1; 17. Liquid inlet 2; 18. Cooling runner 2; 19. Liquid outlet 2; 20. Liquid outlet 1; 21. Mounting groove; 22. Heating strip; 23. Temperature sensor; 24. Mounting cavity; 25. Controller. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-4 This utility model provides an embodiment: an injection mold structure for an umbrella-shaped product made of PP material, including a lower mold 1 and an upper mold 10. The upper mold 10 is provided on the right side of the lower mold 1. Cavities 7 are respectively provided inside the two ends of the right side of the lower mold 1. Hot runners 11 are respectively fixed inside the two ends of the right side of the upper mold 10. A main pipe 13 is provided on the right side of the upper mold 10, and a branch pipe 12 is fixed on the left side of the main pipe 13. Multiple sets of cavities 7 are provided inside the two ends of the right side of the lower mold 1. Guide rods 8 are respectively fixed at the four corners of the right side of the lower mold 1. Inner holes 9 are respectively provided inside the four corners of the left side of the upper mold 10. The guide rods 8 penetrate the interior of the inner holes 9. A controller 25 is provided at the bottom of the front end of the lower mold 1.

[0024] The hot runner 11 penetrates the interior of the upper mold 10. The left side of the branch pipe 12 is fixedly connected to the right side of the hot runner 11. Multiple sets of branch pipe 12 are provided at both ends of the left side of the main pipe 13. Multiple sets of hot runner 11 are provided at both ends of the right side of the inner hole 9. The top and bottom ends of the left side of the multiple sets of cavities 7 are respectively provided with mounting grooves 21, and heating strips 22 are fixed inside the mounting grooves 21. The top and bottom ends of the right side of the lower mold 1 are respectively provided with mounting cavities 24, and temperature sensors 23 are installed inside the mounting cavities 24.

[0025] Specifically, such as Figures 1-4As shown, the mold incorporates segmented injection technology. Each individual cavity 7 has two sets of hot runners 11, dividing the injection process into multiple stages. The injection speed and pressure are adjusted according to the filling requirements of different areas, ensuring uniform flow of PP material in the complex umbrella rib structure and avoiding defects such as bubbles and shrinkage. Multiple small runners are set inside the mold, especially in the details of the umbrella ribs, where a micro-runner design is adopted to ensure uniform flow of PP material in the complex cavity, avoiding poor flow or incomplete injection. At the same time, a precise hot runner 11 design is adopted, optimizing the distribution of the runners and making the hot runners 11 more refined, reducing the cooling time and temperature difference of the PP material, improving fluidity, and ensuring smooth filling of the umbrella rib-shaped product. By using local heating elements 22 at the umbrella rib connection points, it can be ensured that the material can be smoothly filled into the small parts of the mold, improving the molding accuracy of the product.

[0026] Cooling channel 16 is provided on the front end of the left side inside the lower mold 1. Liquid inlet 15 is fixed on the front end of the top of the lower mold 1. Liquid outlet 20 is fixed on the front end of the bottom of the lower mold 1. Cooling channel 28 is provided on the rear end of the left side inside the lower mold 1. Liquid inlet 27 is fixed on the rear end of the top of the lower mold 1. Liquid outlet 29 is fixed on the rear end of the bottom of the lower mold 1. Liquid inlet 15 and liquid outlet 20 are respectively connected to the interior of cooling channel 16. Liquid inlet 27 and liquid outlet 29 are respectively connected to the interior of cooling channel 28.

[0027] Specifically, such as Figures 1-4 As shown, in key areas of the umbrella-shaped product inside the mold, especially in areas with long runners or thin walls, more uniform cooling can be achieved by setting up multi-layer cooling channel inlets 17 and cooling runners 16. Precise control of the coolant flow rate can prevent uneven cooling and warping deformation, improving the stability of the molded product. The presence of a temperature sensor 23 and a temperature control module allows for precise temperature control of various areas of the mold. Real-time monitoring of the mold temperature prevents excessively high or low temperatures during cooling, thus avoiding poor material flow and reducing warping and shrinkage of the product.

[0028] A mounting bracket 2 is fixedly installed on the left side of the lower mold 1, and a connecting plate 4 is provided on the left side inside the mounting bracket 2. A cylinder 2 5 is fixedly installed on the top of the left side of the mounting bracket 2, and a cylinder 3 is fixedly installed on the bottom of the left side of the mounting bracket 2. Ejector pins 6 are fixed at both ends of the right side of the connecting plate 4. An ejection hole 14 is opened inside the left side of the cavity 7. The output ends of the cylinder 3 and cylinder 2 5 on the right side pass through the inside of the left side of the mounting bracket 2 and are fixedly connected to the left side of the connecting plate 4. Multiple sets of ejector pins 6 are provided at both ends of the right side of the connecting plate 4. The right side of the ejector pin 6 passes through the inside of the ejection hole 14.

[0029] Specifically, such as Figures 1-4As shown, multiple ejector pins 6 are set inside the mold to evenly eject the molded umbrella rib products from the mold, avoiding product deformation or damage caused by uneven ejection. The pneumatic ejection method using cylinder 3 and cylinder 5 can reduce the ejection force and avoid product deformation caused by excessive ejection force.

[0030] Working principle: When in use, this utility model uses segmented injection technology, with two sets of hot runners 11 in each individual cavity 7. The injection speed and pressure can be adjusted according to the filling requirements of different areas to inject PP material into the cavity 7. This ensures the uniform flow of PP material in the complex umbrella rib structure. At the same time, the precise hot runner 11 design optimizes the distribution of the runners, making the hot runners 11 more refined and ensuring the smooth filling of umbrella rib-shaped products. By using local heating elements 22 at the umbrella rib connection points, it can be ensured that the material can be smoothly filled into the small parts of the mold.

[0031] Meanwhile, in key areas of the umbrella-shaped product inside the mold, especially in areas with long flow channels or thin walls, more uniform cooling can be achieved by setting up multi-layer cooling channel inlets 2 17 and cooling flow channels 16. By incorporating temperature sensors 23 and employing a temperature control module, precise temperature control can be achieved in all areas of the mold. Real-time monitoring of the mold temperature prevents material flow obstruction caused by excessively high or low temperatures during the cooling process.

[0032] After the umbrella-shaped product is cooled and formed, multiple ejector pins 6 are set inside the mold to evenly eject the formed umbrella-shaped product from the mold, which can avoid product deformation or damage caused by uneven ejection. At the same time, the internal flow channel, gate and ejection part of the mold are made of hardened steel high wear-resistant material, ensuring the high durability of the mold in long-term use.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A PP material umbrella-shaped product injection mold structure, comprising a lower mold (1) and an upper mold (10), characterized in that: The lower mold (1) is provided with an upper mold (10) on its right side. The lower mold (1) has cavities (7) inside its two right ends. The upper mold (10) has hot runners (11) inside its two right ends. The upper mold (10) has a main pipe (13) on its right side and a branch pipe (12) on its left side. The cavities (7) are provided in multiple sets inside the lower mold (1) at its two right ends. The lower mold (1) has guide rods (8) fixed at its four right corners. The upper mold (10) has inner holes (9) inside its four left corners. The guide rods (8) pass through the inner holes (9). The lower mold (1) has a controller (25) at its bottom front end.

2. The umbrella-shaped product injection mold structure according to claim 1, characterized in that: The hot runner (11) penetrates the interior of the upper mold (10), and the left side of the branch pipe (12) is fixedly connected to the right side of the hot runner (11).

3. The umbrella-shaped product injection mold structure according to claim 1, characterized in that: The branch pipes (12) are provided in multiple sets at both ends on the left side of the main pipe (13), and the hot runners (11) are provided in multiple sets at both ends on the right side of the inner hole (9).

4. The umbrella-shaped product injection mold structure according to claim 1, characterized in that: The upper and lower ends of the left side of the multiple sets of cavities (7) are respectively provided with mounting grooves (21), and heating strips (22) are fixed inside the mounting grooves (21). The upper and lower ends of the right side of the lower mold (1) are respectively provided with mounting cavities (24), and temperature sensors (23) are installed inside the mounting cavities (24).

5. The umbrella-shaped product injection mold structure according to claim 1, characterized in that: The lower mold (1) has a cooling channel 1 (16) at the front end of the left side inside, a liquid inlet 1 (15) fixed at the front end of the top of the lower mold (1), a liquid outlet 1 (20) fixed at the front end of the bottom of the lower mold (1), a cooling channel 2 (18) at the rear end of the left side inside the lower mold (1), a liquid inlet 2 (17) fixed at the rear end of the top of the lower mold (1), and a liquid outlet 2 (19) fixed at the rear end of the bottom of the lower mold (1).

6. The umbrella-shaped product injection mold structure according to claim 5, characterized in that: The first liquid inlet (15) and the first liquid outlet (20) are respectively connected to the interior of the first cooling channel (16), and the second liquid inlet (17) and the second liquid outlet (19) are respectively connected to the interior of the second cooling channel (18).

7. The umbrella-shaped product injection mold structure according to claim 1, characterized in that: A mounting bracket (2) is fixedly installed on the left side of the lower mold (1), and a connecting plate (4) is provided on the left side inside the mounting bracket (2). A cylinder two (5) is fixedly installed on the top of the left side of the mounting bracket (2), and a cylinder one (3) is fixedly installed on the bottom of the left side of the mounting bracket (2). Ejector pins (6) are fixed at both ends on the right side of the connecting plate (4). An ejector hole (14) is opened inside the left side of the cavity (7).

8. The umbrella-shaped product injection mold structure according to claim 7, characterized in that: The output ends of the cylinders 1 (3) and 2 (5) on the right side pass through the interior of the left side of the mounting bracket (2) and are fixedly connected to the left side of the connecting plate (4). Multiple sets of ejector pins (6) are provided at both ends of the right side of the connecting plate (4). The right side of the ejector pin (6) passes through the interior of the ejector hole (14).

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