Core pulling structure for injection mold
The design of the biaxial core-pulling structure solves the problems of small core-pulling space and stuck injection parts in injection molds, achieving more efficient demolding and improved quality of molded parts, while reducing mold maintenance costs.
Patent Information
- Application Number
- CN202422349505.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-09-26
AI Technical Summary
Existing core-pulling structures for injection molds can only pull out the core in one fixed direction during the operation of some irregularly shaped injection molded parts. This results in a small core-pulling space, which can easily cause the injection molded parts to get stuck and make it difficult to successfully demold.
A biaxial core-pulling structure is designed, which uses a combination of inclined rods, core-pulling blocks, spiral grooves, rotating rods and return springs to achieve bidirectional movement of the core-pulling blocks, thereby expanding the core-pulling space and flexibility.
It significantly expands the core-pulling space, improves demolding efficiency and the stability of molded parts, reduces mold wear, lowers maintenance costs, and enhances mold adaptability and production efficiency.
Smart Images
Figure CN223671757U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the core -pulling structure related technical field of injection mold, concretely relates to a core -pulling structure for injection mold. BACKGROUND
[0002] The core -pulling structure in injection mold is a mold mechanism for manufacturing plastic products with complex internal geometry. During the injection molding process, since some parts of the plastic product (such as holes, grooves, etc.) are not consistent with the mold opening direction, these parts can be formed when the mold is closed, but cannot be directly demolded when the mold is opened. The role of the core -pulling mechanism is to pull out these difficult-to-demold parts (i.e. the core) from the mold during mold opening and closing, so that the plastic product can be smoothly demolded.
[0003] However, the existing core -pulling structure for injection mold can only be pulled out in a fixed direction during the operation process of some special-shaped injection molded parts, and the injection molded part is pulled out during the pulling-out process. The core -pulling space is small, the gap is small, the injection molded part is stuck in the core -pulling operation, and it is difficult to pull out. To solve the above problems, we invented a double-axial core -pulling structure. UTILITY MODEL CONTENTS
[0004] The utility model discloses a core -pulling structure for injection mold to solve the core -pulling structure for injection mold in the background art mentioned above in the operation process of some special-shaped injection molded parts, can only be pulled out in a fixed direction, and the injection molded part is pulled out during the pulling-out process. The core -pulling space is small, the gap is small, the injection molded part is stuck in the core -pulling operation, and it is difficult to pull out.
[0005] To achieve the above object, the utility model provides the following technical scheme: a core -pulling structure for injection mold, including upper mould and lower mould;
[0006] The lower left side of the upper mould is internally provided with an upper mould cavity, the upper left side of the lower mould is internally provided with a lower mould cavity, the upper right side of the upper mould is provided with a inclined rod, the middle inner side of the inclined rod and the upper mould cavity is provided with a tension spring, the middle position of the tension spring is provided with an injection tube, and the upper side of the injection tube is connected with the upper mould at the position of the elastic plate;
[0007] The right upper side of the lower mould is provided with a core -pulling block;
[0008] The upper side of the inclined rod is provided with a spiral groove, the lower left side of the core -pulling block is provided with a rotating cavity, the middle inner side of the lower mould is provided with a cavity, the inner side of the cavity is provided with a return spring, and the upper side of the return spring is provided with a rotating rod.
[0009] Preferably, the inclined rod is connected to the upper mold through a bolt connection, and the inclined rod is connected to the core pulling block through a penetrating connection.
[0010] Preferably, the core pulling block is connected to the lower mold through a sliding fit on the right rear side, and an opening is provided on the left side of the sliding fit.
[0011] Preferably, the core pulling block is pulled out from the opening after moving to the opening on the left side of the sliding fit, and the core pulling block and the inclined rod are provided with a slot hole connected through the spiral groove.
[0012] Preferably, the core pulling block can be rotated by being extruded on the upper side of the rotating rod through the spiral groove, and the rotating rod is connected to the cavity through a sleeve fit.
[0013] Preferably, the upper and lower ends of the return spring are connected to the rotating rod and the lower mold respectively through a welding integrated connection, and the upper end of the rotating rod is provided with an arc angle.
[0014] Preferably, the rotating rod can move up and down in the cavity through the return spring, and the injection molding pipe can move up and down in the upper mold through the tension spring.
[0015] Compared with the prior art, the core pulling structure for the injection mold has the following advantages:
[0016] In the core pulling structure for the injection mold, the following advantages can be achieved through the settings of the inclined rod, the core pulling block, the spiral groove, the rotating cavity, the rotating rod, the return spring and the cavity:
[0017] In the core pulling structure design of the injection mold, the core pulling block not only can move in a fixed direction, but also has the ability to move in two directions through the settings of the core pulling block, the spiral groove, the inclined rod and the rotating rod cavity structure. This design shows significant advantages in injection molding, especially when dealing with complex shaped injection parts.
[0018] Expand the core pulling space and flexibility:
[0019] The bidirectional movement of the core pulling block significantly expands the core pulling space, providing a more flexible demolding path for complex shaped injection parts. This not only reduces the risk of injection parts being stuck during core pulling, but also improves the efficiency of demolding operation.
[0020] Improve the quality of the molded parts:
[0021] The bidirectional movement mechanism ensures the stability of the molded parts during demolding, reducing the deformation or damage of the molded parts caused by single core pulling direction. More accurate core pulling path helps to maintain the integrity and precision of the molded parts.
[0022] Enhance the adaptability of the mold:
[0023] The flexibility of this structure enables the mold to accommodate a wider variety of injection molded parts with more complex shapes, reducing the complexity of mold design and adjustment, and enhancing production flexibility.
[0024] Simplified demolding operation:
[0025] The bidirectional movement of the core-pulling block simplifies the demolding operation, reduces the difficulty and time of operation, and improves production efficiency. At the same time, it reduces the dependence on operators and reduces labor costs.
[0026] Reducing mold maintenance costs:
[0027] By more evenly distributing the stress during the demolding process, reducing the wear and tear of mold components, prolonging the service life of the mold, and reducing the frequency and cost of maintenance and replacement of parts.
[0028] Improving production efficiency:
[0029] The bidirectional movement mechanism shortens the core-pulling and demolding time, improves the overall production efficiency on the production line, and helps to meet high production demands.
[0030] Conclusion:
[0031] The bidirectional core-pulling structure significantly improves the demolding efficiency and quality of molded parts by providing more core-pulling space, enhancing the adaptability and flexibility of the mold, and reducing production costs. It is an important innovation in injection mold design. This design not only solves the limitations of traditional one-way core-pulling structure in complex injection molded parts demolding, but also opens up new ways to improve production efficiency and product quality. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 The structure diagram of the upper mold and the lower mold after separation in the utility model.
[0033] Figure 2 The structure diagram of the upper mold and the lower mold after combination in the utility model.
[0034] Figure 3 The structure diagram of the upper mold in the utility model Figure 2 The structure diagram of the enlarged circular area.
[0035] Figure 4 The structure diagram of the upper mold in the utility model.
[0036] In the figure:
[0037] 1, upper mold; 2, lower mold; 3, injection tube; 4, spring plate; 5, tension spring; 6, upper mold cavity; 7, lower mold cavity; 8, inclined rod; 9, core-pulling block; 10, spiral groove; 11, rotating cavity; 12, rotating rod; 13, return spring; 14, cavity. DETAILED DESCRIPTION
[0038] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.
[0039] The utility model provides a core pulling structure for injection mold as Figures 1-4 The utility model discloses a core pulling structure for injection mold, which comprises an upper mold 1 and a lower mold 2.
[0040] An upper mold cavity 6 is formed at the lower left inner position of the upper mold 1, a lower mold cavity 7 is arranged at the upper left inner position of the lower mold 2, an inclined rod 8 is arranged at the upper right position of the upper mold 1, a tension spring 5 is arranged at the middle inner upper position of the inclined rod 8 and the upper mold cavity 6, an injection pipe 3 is arranged at the middle position of the tension spring 5, and a spring plate 4 is arranged at the connecting position between the upper side of the injection pipe 3 and the upper mold 1.
[0041] A core pulling block 9 is arranged at the upper right position of the lower mold 2.
[0042] A spiral groove 10 is arranged at the upper outer position of the inclined rod 8, a rotating cavity 11 is arranged at the lower left position of the core pulling block 9, a cavity 14 is arranged at the middle inner position of the lower mold 2, a return spring 13 is arranged at the inner position of the cavity 14, and a rotating rod 12 is arranged at the upper position of the return spring 13.
[0043] In the embodiment, the steps and principles
[0044] Injection process:
[0045] Mold closing and positioning:
[0046] The upper mold 1 and the lower mold 2 are combined to ensure that the inclined rod 8 accurately enters the core pulling block 9, the spiral groove 10 of the inclined rod 8 is engaged with the slot hole of the core pulling block 9, and the positioning process starts.
[0047] Core pulling block movement and indexing:
[0048] With the combination of the upper mold 1 and the lower mold 2, the inclined rod 8 moves downward and presses the core pulling block 9, so that the core pulling block 9 moves left along the sliding embedding groove of the lower mold 2.
[0049] After the core pulling block 9 moves to the opening position of the sliding embedding groove, the spiral groove 10 of the inclined rod 8 contacts the core pulling block 9, and the core pulling block 9 starts to rotate on the lower mold 2 through the guidance of the spiral groove 10.
[0050] The rotating rod 12 works with the return spring 13:
[0051] The rotating cavity 11 of the core-pulling block 9 contacts with the rotating rod 12, the return spring 13 is compressed, and the rotating rod 12 is pressed into the cavity 14 until the inclined rod 8 completely presses against the core-pulling block 9.
[0052] The core-pulling block 9 rotates with the inclined rod 8, and the rotation is completed.
[0053] Injection operation:
[0054] The upper mold 1 and the lower mold 2 are completely closed, and the upper mold cavity 6 and the lower mold cavity 7 are combined.
[0055] The injection tube 3 injects the injection liquid into the upper mold cavity 6 and the lower mold cavity 7 through the elastic action of the tension spring 5.
[0056] Molding and demolding process:
[0057] Cooling and molding:
[0058] The injection liquid cools in the upper mold cavity 6 and the lower mold cavity 7, forming a molded part.
[0059] Demolding preparation:
[0060] The upper mold 1 and the lower mold 2 are separated, and the inclined rod 8 begins to be pulled out of the core-pulling block 9.
[0061] Core pulling and pulling out:
[0062] The core-pulling block 9 is reversely rotated under the action of the helical groove 10 of the inclined rod 8, and the molded part is pulled out of the upper mold cavity 6 and the lower mold cavity 7.
[0063] Reset:
[0064] When the inclined rod 8 is completely pulled out of the core-pulling block 9, the return spring 13 returns to its original state and pushes the rotating rod 12 back to the initial position.
[0065] The back side of the core-pulling block 9 is re-inserted into the sliding and embedding connection opening of the lower mold 2, and moves to the right with the inclined rod 8, preparing for the next injection.
[0066] Principle of use:
[0067] Helical groove action: The helical groove 10 of the inclined rod 8 meshes with the slot hole of the core-pulling block 9, realizing the rotation and positioning of the core-pulling block 9.
[0068] Spring and rotating rod action: The return spring 13 and the rotating rod 12 ensure the accurate resetting of the core-pulling block 9 and the stability of the core-pulling operation.
[0069] Injection and cooling: The injection tube 3 and the tension spring 5 ensure the smooth progress of the injection operation, and form a molded part after cooling.
[0070] Core pulling operation: The movement of the inclined rod 8 and the rotation of the core pulling block 9 work together to achieve smooth demolding of the molded part.
[0071] like Figures 1-4 As shown, the inclined rod 8 is connected to the upper mold 1 by bolts, and the inclined rod 8 is connected to the core-pulling block 9 by a through connection. The rear right side of the core-pulling block 9 is slidably connected to the lower mold 2, and an opening is provided on the left side of the slidable connection. After the core-pulling block 9 moves to the opening on the left side of the slidable connection, it comes out from the opening. The core-pulling block 9 and the inclined rod 8 are provided with meshing slots at the spiral groove 10. The core-pulling block 9 can be squeezed on the upper side of the rotating rod 12 and rotated through the spiral groove 10. The rotating rod 12 is connected to the cavity 14 by a nested connection. The upper and lower ends of the return spring 13 are connected to the rotating rod 12 and the lower mold 2 respectively by a welded integrated connection. The upper end of the rotating rod 12 is set with an arc angle. The rotating rod 12 can move up and down in the cavity 14 through the return spring 13. The injection tube 3 can move up and down in the upper mold 1 by the tension spring 5.
[0072] Preferably, when the operator uses the injection mold for injection molding, the upper mold 1 and the lower mold 2 are joined together, and the inclined rod 8 moves in the core-pulling block 9. The inclined rod 8 presses against the core-pulling block 9, and the core-pulling block 9 moves to the left in the lower mold 2 through the sliding connection between the core-pulling block 9 and the lower mold 2. When the spiral groove 10 of the inclined rod 8 contacts the core-pulling block 9, it can just reach the opening position on the sliding side. The core-pulling block 9 can rotate on the lower mold 2 through the spiral groove 10. Specifically, the rotating cavity 11 of the core-pulling block 9 moves to the rotating rod 12, and the return spring 13 presses the rotating rod 12 upward into the rotating cavity 11. The core-pulling block 9 moves and rotates with the inclined rod 8. Mold 1 and lower mold 2 are closed, upper mold cavity 6 and lower mold cavity 7 are joined, and injection tube 3 injects injection liquid into upper mold cavity 6 and lower mold cavity 7. After the injection liquid cools down, the molded part is obtained. At this time, upper mold 1 and lower mold 2 separate. As the inclined rod 8 is pulled out from the core-pulling block 9, the core-pulling block 9 rotates. During the rotation of the core-pulling block 9, the molded part is pulled out from the upper mold cavity 6 and lower mold cavity 7, completing the core-pulling operation. When the spiral groove 10 of the inclined rod 8 is completely pulled out from the core-pulling block 9, the rear side of the core-pulling block 9 is re-engaged with the sliding connection opening of the lower mold 2, and moves to the right as the inclined rod 8 continues to move.
[0073] 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 core-pulling structure for injection mold, comprising an upper mold (1) and a lower mold (2); An upper mold cavity (6) is formed at the left lower inner position of the upper mold (1), a lower mold cavity (7) is arranged at the left upper inner position of the lower mold (2), an inclined rod (8) is arranged at the right upper position of the upper mold (1), a tension spring (5) is arranged at the middle inner upper position of the inclined rod (8) and the upper mold cavity (6), an injection tube (3) is arranged at the middle position of the tension spring (5), and a spring plate (4) is arranged at the connecting position between the upper side of the injection tube (3) and the upper mold (1); A core-pulling block (9) is arranged at the right upper position of the lower mold (2); characterized in that A helical groove (10) is arranged at the upper outer position of the inclined rod (8), a rotating cavity (11) is arranged at the left lower position of the core-pulling block (9), a cavity (14) is arranged at the middle inner position of the lower mold (2), a return spring (13) is arranged at the inner position of the cavity (14), and a rotating rod (12) is arranged at the upper position of the return spring (13).
2. The core-pulling structure for an injection mold according to claim 1, characterized by: The inclined rod (8) is connected with the upper mold (1) by bolt connection, and the inclined rod (8) is connected with the core-pulling block (9) by penetrating connection.
3. The core-pulling structure for an injection mold according to claim 2, characterized by: The right rear side of the core-pulling block (9) is slidingly embedded with the lower mold (2), and an opening is arranged at the left side of the slidingly embedded connection.
4. The core-pulling structure for an injection mold according to claim 3, characterized by: The core-pulling block (9) is pulled out from the opening after moving to the opening at the left side of the slidingly embedded connection, and the core-pulling block (9) and the helical groove (10) of the inclined rod (8) are arranged with meshing connection grooves.
5. The core-pulling structure for an injection mold according to claim 4, characterized by: The core-pulling block (9) can be squeezed on the upper side of the rotating rod (12) to rotate through the helical groove (10), and the rotating rod (12) is connected with the cavity (14) by sleeve embedding connection.
6. The core-pulling structure for an injection mold according to claim 5, wherein: The upper and lower ends of the return spring (13) are connected with the rotating rod (12) and the lower mold (2) respectively by integral welding connection, and the upper end of the rotating rod (12) is arranged as an arc angle.
7. The core-pulling structure for an injection mold according to claim 6, characterized by: The rotating rod (12) can move up and down in the cavity (14) through the return spring (13), and the injection tube (3) can move up and down in the upper mold (1) through the tension spring (5).