Injection molding mold for plastic cap

Abstract

The utility model relates to injection mould field discloses a kind of plastic cover injection moulding mould, including bottom die, the top of bottom die is provided with top die, and the center of bottom die is provided with forming cavity, the top of top die is rotatably connected with support frame by pivot, the bottom of support frame is rotatably connected with slide also by pivot, the outer wall of slide is slidably connected with guide rail, the inner wall of guide rail is provided with recess, the outer wall of slide is fixedly connected with fixed frame, the outer wall of fixed frame is rotatably connected with rolling ball also by pivot, the bottom of fixed frame is fixedly connected with rubber block, the inner wall of guide rail is fixedly connected with buffer block.In the utility model, by being provided with support frame, slide, guide rail and the structure such as structure, setting guiding structure ensures accurate mould closing, improves mould operation smoothness, reduces mould closing impact simultaneously, prolongs mould life, is convenient for demoulding, improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to an injection mold for a plastic cap. Background Technology

[0002] The reason why plastic caps are commonly made using injection molding is that this process perfectly meets the core needs of plastic caps in terms of mass production, complex structure, high precision, high efficiency, and low cost. Injection molding machines can achieve a high degree of automation, from raw material drying, plasticizing, injection, pressure holding, cooling, mold opening, product ejection to mold closing.

[0003] When molding a plastic cap, molten plastic is first injected into the mold cavity at high speed and high pressure. The plastic solidifies and takes shape inside the mold by closing the top mold and bottom mold. The mold separates, and the finished product is pushed out of the mold cavity by ejector pins. The plastic part is then removed, and the cycle begins with the next mold, completing the injection molding process.

[0004] In existing technologies, injection molding typically lacks a buffer function. The instantaneous impact force prevents the parting surface from closing completely, causing molten material to overflow and produce burrs. Mold closing vibration leads to positioning misalignment, resulting in a decrease in the dimensional accuracy of the plastic cap. This, in turn, risks shortening the mold life and reducing the product qualification rate. To address these issues, a new injection molding die for plastic caps is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a plastic cap injection molding die, which aims to improve the problem that the lack of buffer function in the existing plastic cap injection molding die leads to overflow when the mold is closed, thus reducing production accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a plastic cap injection molding mold, comprising a bottom mold, a top mold at the top of the bottom mold, a forming cavity at the center of the bottom mold, a support frame rotatably connected to the top of the top mold via a pivot, a slide block rotatably connected to the bottom of the support frame via a pivot, a guide rail slidably connected to the outer wall of the slide block, a groove formed in the inner wall of the guide rail, a fixing frame fixedly connected to the outer wall of the slide block, a rolling ball rotatably connected to the outer wall of the fixing frame via a pivot, a rubber block fixedly connected to the bottom of the fixing frame, and a buffer block fixedly connected to the inner wall of the guide rail.

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

[0008] The bottom of the guide rail is fixedly connected to the upper surface of the bottom mold.

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

[0010] The inner wall of the groove is rotatably connected to the outer wall of the rolling ball.

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

[0012] The rubber block is inclined downward on the side closest to the bottom mold, and the buffer block is inclined downward on the side furthest from the bottom mold.

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

[0014] The rubber block engages with the buffer block.

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

[0016] The bottom mold has an installation groove on its surface, and a spiral sealing strip is fixedly connected to the inner wall of the installation groove. The inner surface of the spiral sealing strip has a beveled surface. The top mold has a spiral baffle fixedly connected to its outer wall, and the outer wall of the spiral baffle has an adapter surface.

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

[0018] The beveled surface is inclined downwards, and the spiral sealing strip is fitted onto the outer wall of the forming cavity.

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

[0020] The surface of the beveled surface is adapted to the surface of the mating surface.

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

[0022] 1. In this utility model, the guide structure ensures accurate mold closing, the rolling ball reduces friction and improves the smoothness of mold operation, the rubber block and the buffer block mesh to buffer and reduce the impact of mold closing, extend the mold life, and the inclined surface design makes the upward resistance less than the downward resistance, which facilitates demolding and improves production efficiency.

[0023] 2. In this utility model, by setting a U-shaped sealing strip and a stop strip to fit tightly with the beveled surface and the matching surface, leakage is effectively prevented, product quality is guaranteed, installation is convenient, replacement is easy, maintenance costs are reduced, the sealing and durability of the mold are enhanced, and production efficiency is improved. Attached Figure Description

[0024] Figure 1 This is a side view of the main structure of a plastic cap injection mold proposed in this utility model;

[0025] Figure 2 This utility model proposes an injection mold for plastic caps. Figure 1 Enlarged view of region A in the middle;

[0026] Figure 3This is a bottom view schematic diagram of the main structure of a plastic cap injection mold proposed in this utility model;

[0027] Figure 4 This is a side view of the guide rail and slide structure of a plastic cap injection mold proposed in this utility model.

[0028] Figure 5 This is a cross-sectional schematic diagram of the guide rail and slide of a plastic cap injection molding die proposed in this utility model.

[0029] Legend:

[0030] 1. Bottom mold; 2. Top mold; 3. Forming cavity; 4. Mounting groove; 5. U-shaped sealing strip; 6. Beveled surface; 7. U-shaped stop strip; 8. Adaptive surface; 9. Support frame; 10. Slide block; 11. Guide rail; 12. Groove; 13. Fixing frame; 14. Rolling ball; 15. Rubber block; 16. Buffer block. 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 1-3 This utility model provides an embodiment of a plastic cap injection molding mold, including a bottom mold 1, a top mold 2 on the top of the bottom mold 1, the top mold 2 being driven by an external hydraulic cylinder and embedded in the forming cavity 3 in the bottom mold 1 for mold closing and forming. The forming cavity 3 is opened at the center of the bottom mold 1. The top of the top mold 2 is rotatably connected to a support frame 9 via a rotating shaft. The bottom of the support frame 9 is also rotatably connected to a slide block 10 via a rotating shaft. The outer wall of the slide block 10 is slidably connected to a guide rail 11. The bottom of the guide rail 11 is fixedly connected to the upper surface of the bottom mold 1. The support frame 9, the slide block 10 and the guide rail 11 are respectively arranged in two sets and are located on both sides of the bottom mold 1. When the top mold 2 descends, the support frame 9 drives the slide block 10 to move on the guide rail 11, providing guidance during mold closing.

[0033] Reference Figures 3-5The inner wall of the guide rail 11 has a groove 12. The outer wall of the slide block 10 is fixedly connected to a fixing frame 13. The outer wall of the fixing frame 13 is also rotatably connected to a rolling ball 14 via a rotating shaft. The inner wall of the groove 12 is rotatably connected to the outer wall of the rolling ball 14. The bottom of the fixing frame 13 is fixedly connected to a rubber block 15. The side of the rubber block 15 closest to the bottom mold 1 is inclined downwards. The inner wall of the guide rail 11 is fixedly connected to a buffer block 16. The side of the buffer block 16 away from the bottom mold 1 is inclined downwards. Several sets of buffer blocks 16 are provided and are evenly distributed on the two sets of guide rails 11. The rubber block 15 and the buffer block 16 mesh with each other. When the top mold 2 descends, the rubber block 15 and the buffer block 16 mesh with each other to provide a certain degree of buffering. When the top mold 2 rises, due to the opening of the inclined surfaces of the two, the resistance is less than the resistance of the descending meshing movement.

[0034] Reference Figure 1 and Figure 3 The bottom mold 1 has an installation groove 4 on its surface. A U-shaped sealing strip 5 is fixedly connected to the inner wall of the installation groove 4. The U-shaped sealing strip 5 is sleeved on the outer wall of the forming cavity 3. The inner surface of the U-shaped sealing strip 5 has a beveled surface 6, which is inclined downwards. The outer wall of the top mold 2 has a U-shaped stop strip 7 fixedly connected to its surface. The outer wall of the U-shaped stop strip 7 has a mating surface 8. The surface of the beveled surface 6 matches the surface of the mating surface 8. When the top mold 2 descends, the U-shaped stop strip 7 can be embedded inside the U-shaped sealing strip 5. The beveled surface 6 and the mating surface 8 can increase the tightness of their fit.

[0035] Working principle: An external hydraulic cylinder drives the top mold 2 to descend. Two sets of support frames 9 rotate via a rotating shaft, causing the slide block 10 to slide on the guide rail 11, providing guidance for the mold closing process. The rolling ball 14 of the fixed frame 13 on the slide block 10 rolls in the groove 12 of the guide rail 11, reducing friction. At the same time, the rubber block 15 at the bottom of the fixed frame 13 engages with the buffer block 16 on the inner wall of the guide rail 11, providing cushioning and slowing down the descent speed of the top mold 2, ensuring smooth mold closing. When the top mold 2 descends to contact the bottom mold 1, the U-shaped baffle 7 on the outer wall of the top mold 2 is embedded in the U-shaped sealing strip 5 in the mounting groove 4 of the bottom mold 1. Because the oblique surface 6 of the U-shaped sealing strip 5 and the mating surface 8 of the U-shaped baffle 7 cooperate with each other, the two fit more tightly, preventing the plastic melt from leaking during the injection molding process. After the plastic cools and solidifies, the hydraulic cylinder drives the top mold 2 to rise. At this time, due to the inclined surface design, the rubber block 15 and the buffer block 16 have less resistance to rising, and the top mold 2 smoothly separates from the bottom mold 1, completing the injection molding process of the plastic cover.

[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 plastic cap injection molding die, comprising a bottom mold (1), a top mold (2) being provided on the top of the bottom mold (1), and a molding cavity (3) being provided at the center of the bottom mold (1), characterized in that: The top of the top mold (2) is rotatably connected to a support frame (9) via a pivot. The bottom of the support frame (9) is also rotatably connected to a slide block (10) via a pivot. The outer wall of the slide block (10) is slidably connected to a guide rail (11). The inner wall of the guide rail (11) is provided with a groove (12). The outer wall of the slide block (10) is fixedly connected to a fixing frame (13). The outer wall of the fixing frame (13) is also rotatably connected to a rolling ball (14) via a pivot. The bottom of the fixing frame (13) is fixedly connected to a rubber block (15). The inner wall of the guide rail (11) is fixedly connected to a buffer block (16).

2. The injection mold for a plastic cap according to claim 1, characterized in that: The bottom of the guide rail (11) is fixedly connected to the upper surface of the bottom mold (1).

3. The injection mold for a plastic cap according to claim 1, characterized in that: The inner wall of the groove (12) is rotatably connected to the outer wall of the rolling ball (14).

4. The injection mold for a plastic cap according to claim 1, characterized in that: The rubber block (15) is inclined downward on the side closer to the bottom mold (1), and the buffer block (16) is inclined downward on the side away from the bottom mold (1).

5. The injection mold for a plastic cap according to claim 1, characterized in that: The rubber block (15) engages with the buffer block (16).

6. The injection mold for a plastic cap according to claim 1, characterized in that: The bottom mold (1) has an installation groove (4) on its surface. A spiral sealing strip (5) is fixedly connected to the inner wall of the installation groove (4). A chamfered surface (6) is provided on the inner surface of the spiral sealing strip (5). A spiral baffle (7) is fixedly connected to the outer wall of the top mold (2). An adapter surface (8) is provided on the outer wall of the spiral baffle (7).

7. The injection mold for a plastic cap according to claim 6, characterized in that: The oblique surface (6) is inclined downwards, and the spiral sealing strip (5) is sleeved on the outer wall of the forming cavity (3).

8. The injection mold for a plastic cap according to claim 6, characterized in that: The surface of the oblique surface (6) is adapted to the surface of the mating surface (8).

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