Injection mold with self-locking function

Abstract

The utility model discloses an injection mold with a self-locking function, relates to the field of injection molds, and aims to solve the problems that an upper mold and a lower mold are closed during injection molding and the closed molds are lack of effective limiting, so that a gap is formed between the two molds, the molds are loosened during workpiece molding, and the product quality is influenced. According to the technical scheme, the die comprises a lower die base and an upper die base, a positioning guide column is arranged above the lower die base, a connecting hole is formed in the lower end of the upper die base and corresponds to the positioning guide column, an open groove is formed in the side wall of the positioning guide column, and the upper die base and the lower die base are connected through the open groove. Four mounting cavities are formed in the upper die base, sliding blocks are arranged in the mounting cavities, limiting blocks are arranged on one sides of the sliding blocks, the limiting blocks and the sliding blocks are slidably connected with the upper die base, the limiting blocks correspond to the opening grooves, and second compression springs are arranged in the mounting cavities.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molds, specifically to an injection mold with a self-locking function. Background Technology

[0002] Injection molds are tools used to produce plastic products; they are also tools that give plastic products a complete structure and precise dimensions. Injection molding is a processing method used to mass-produce certain complex-shaped parts. Specifically, it refers to injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining the molded product after cooling and solidification.

[0003] A search revealed that prior art, publication number CN218948368U, discloses an injection mold with a self-locking function, including a moving mold. A fixed plate is fixedly connected to one end of a fixed block, and a locking block is fixedly connected to the lower end of one side of the fixed plate. The locking block is inserted into a locking groove located on the side of the fixed mold. Rotary grooves are provided on both the front and rear sides of the moving mold, and a reset shaft is fixedly connected to the inner wall of each rotary groove. A flap is mounted on the reset shaft, and a latch is fixedly connected to the lower rear side of the flap. The latch is inserted into a latch groove located on the front and rear sides of the fixed mold. This self-locking injection mold's locking block can elastically extend and retract through the matching of the fixed block, sliding groove, spring, and guide wheel, achieving a self-locking effect and making it more convenient to use, avoiding repetitive use. Furthermore, the device can achieve multiple locking in four directions through the locking block and latch, resulting in more stable installation. It can also be stably installed through positioning blocks and positioning slots, further enhancing its ease of use.

[0004] However, the following drawbacks still exist in this device and existing technology:

[0005] Existing injection molds lack self-locking functionality. During injection molding, the upper and lower molds close, but the closing molds lack effective limiting mechanisms, resulting in gaps between the two molds. When the workpiece is being molded, the molds may become loose, causing the upper and lower molds to shift during the closing process, reducing injection molding accuracy and failing to meet usage requirements. Utility Model Content

[0006] The purpose of this invention is to provide an injection mold with a self-locking function.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A self-locking injection mold includes a lower mold base and an upper mold base, with the upper mold base positioned above the lower mold base. Four positioning guide pillars are provided on the upper part of the lower mold base and are fixedly connected to it. The four positioning guide pillars are located at the four corners of the lower mold base. Four connecting holes are provided at the lower end of the upper mold base and are located at the four corners of the upper mold base. The connecting holes correspond to the positioning guide pillars, and the positioning guide pillars are slidably connected to the upper mold base. The sidewalls of the positioning guide pillars are provided with openings... The upper mold base has four mounting cavities, which are connected to the connecting holes. Each mounting cavity contains a slider, with a limit block on one side and fixedly connected to it. The limit block and slider are slidably connected to the upper mold base. The limit block corresponds to the opening slot and engages with the positioning guide post. A second compression spring is also located inside the mounting cavity, on one side of the slider, with both ends fixedly connected to the upper mold base and the slider, respectively.

[0009] By adopting the above technical solution, the positioning guide post is inserted into the connecting hole to close the upper mold base and the lower mold base. When the positioning guide post is inserted into the connecting hole and contacts the limiting block, it applies an upward oblique pushing force to the limiting block. When the pushing force exceeds the elastic force of the second compression spring, the limiting block is pressed into the mounting cavity. When the positioning guide post is fully inserted into the connecting hole, the opening slot is located on one side of the limiting block. At this time, the pushing force applied by the positioning guide post to the limiting block disappears, and the compressed second compression spring applies a pushing force to the limiting block, pushing the limiting block into the opening slot. This provides a limiting effect on the positioning guide post inserted into the connecting hole, preventing the positioning guide post from falling out of the connecting hole and providing a self-locking function for the closed injection mold. When opening the mold, the slider is manually pulled to pull the limiting block out of the opening slot, and then the positioning guide post is removed from the connecting hole.

[0010] Furthermore, a mold core is provided above the lower mold base and is fixedly connected to the lower mold base. A mold cavity is provided at the lower end of the upper mold base and is correspondingly provided with the mold core. A casting seat is provided at the upper end of the upper mold base and is integrally connected with the upper mold base. The casting seat is connected to the mold cavity.

[0011] By adopting the above technical solution, after the upper mold base and the lower mold base are closed, the mold core is inserted into the mold cavity, and an injection cavity is formed between the mold core and the upper mold base. The heated and molten plastic is injected into the injection cavity under high pressure through the casting seat. After cooling and solidification, the molded product is obtained.

[0012] Furthermore, the upper end of the positioning guide post is shaped like a frustum, and the lower part of one end of the limiting block is provided with an arc-shaped chamfer.

[0013] By adopting the above technical solution, when the arc-shaped chamfer contacts the positioning guide post, it can better press the limiting block into the installation cavity, effectively preventing the inserted positioning guide post from getting stuck with the limiting block.

[0014] Furthermore, elastic pull ropes are provided on both sides of the upper mold base. There are two elastic pull ropes, and they are positioned between the two sliders. The two ends of the elastic pull ropes are fixedly connected to the sliders.

[0015] By adopting the above technical solution, the two ends of the elastic pull rope are connected to the sliders. When the elastic pull rope is pulled, the two sliders are simultaneously pulled along the mounting cavity under the action of the pulling force, and the limiting block is pulled out from the opening slot.

[0016] Furthermore, guide rings are provided on both sides of the upper mold base, and four guide rings are provided. The guide rings are located on one side of the mounting cavity. The guide rings are connected to the upper mold base by screws, and the elastic pull rope is slidably connected to the guide rings.

[0017] By adopting the above technical solution, the guide ring and the elastic pull rope are connected in a continuous sliding manner. The guide ring plays a guiding and limiting role on the pulled elastic pull rope, so that the slider can be pulled simultaneously when the elastic pull rope is pulled.

[0018] Furthermore, a first compression spring is provided at the top of the connecting hole, and one end of the first compression spring is fixedly connected to the upper mold base.

[0019] By adopting the above technical solution, the positioning guide post is fully inserted into the connecting hole and contacts the first compression spring, and the first compression spring is compressed. When the limiting block is pulled out from the opening slot and separated from the positioning guide post, the compressed first compression spring will apply a pushing force to the positioning guide post inserted into the connecting hole, lifting the upper mold base to a certain height, so as to facilitate the opening of the upper mold base and the lower mold base.

[0020] Furthermore, a base is provided below the lower mold base, and the base is connected to the lower mold base by screws. The base is U-shaped. A mounting plate is provided below the lower mold base, and the mounting plate is slidably connected to the base. An ejector rod is provided above the mounting plate, and the lower end of the ejector rod is fixedly connected to the mounting plate. The ejector rod is slidably connected to the lower mold base and the mold core. An electric push rod is provided below the mounting plate, and both ends of the electric push rod are fixedly connected to the base and the lower mold base, respectively.

[0021] By adopting the above technical solution, the electric push rod drives the mounting plate to rise and fall. As the mounting plate rises and falls, it drives the ejector rod to rise and fall. When the ejector rod rises and contacts the molded part, it applies an upward thrust to the molded part, and under the action of the thrust, it lifts the molded part.

[0022] In summary, the beneficial technical effects of this utility model are as follows:

[0023] 1. The system employs a positioning guide post, connecting hole, slider, mounting cavity, opening slot, limiting block, and second compression spring. The slider and limiting block are slidably connected to the upper mold base in the mounting cavity. When the positioning guide post is inserted into the connecting hole and contacts the limiting block, it applies an upward oblique pushing force to the limiting block. When the pushing force exceeds the elastic force of the second compression spring, the limiting block is pressed into the mounting cavity first. When the positioning guide post is fully inserted into the connecting hole, the opening slot is located on one side of the limiting block. At this time, the pushing force applied by the positioning guide post to the limiting block disappears, and the compressed second compression spring applies a pushing force to the limiting block, aligning the limiting block with the opening slot and pushing it in. This provides a limiting function for the positioning guide post inserted into the connecting hole, preventing the positioning guide post from falling out of the connecting hole and providing a self-locking function for the injection mold during mold closing.

[0024] 2. An elastic pull rope and a first compression spring are used. The two ends of the elastic pull rope are connected to the slider. When the elastic pull rope is pulled, the two sliders are pulled along the mounting cavity at the same time, pulling the limit block out of the opening slot. The positioning guide post is fully inserted into the connecting hole and contacts the first compression spring, compressing the first compression spring. When the limit block is pulled out of the opening slot and separates from the positioning guide post, the compressed first compression spring will apply a pushing force to the positioning guide post inserted into the connecting hole, lifting the upper mold base to a certain height, which facilitates the opening of the upper mold base and the lower mold base. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the present invention and form part of the specification, but do not constitute a limitation thereof. In the drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of this practical application;

[0027] Figure 2 This is a bottom view structural diagram of the mold base in practical use;

[0028] Figure 3 This is a diagram showing the connection relationship between the positioning guide post and the upper mold base in this practical application.

[0029] Figure 4 This is a 3D diagram showing the connection between the practical limit block and the slider.

[0030] In the diagram, 1. Base; 2. Lower mold base; 3. Mounting plate; 4. Ejector rod; 5. Electric actuator; 6. Mold core; 7. Positioning guide post; 8. Upper mold base; 9. Casting base; 10. Elastic pull rope; 11. Mold cavity; 12. Connecting hole; 13. Slider; 14. Guide ring; 15. Mounting cavity; 16. First compression spring; 17. Opening slot; 18. Limiting block; 19. Second compression spring. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] 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.

[0033] Please see Figure 1-4 This utility model provides a technical solution: an injection mold with a self-locking function, including a lower mold base 2 and an upper mold base 8, with the upper mold base 8 positioned above the lower mold base 2. Four positioning guide pillars 7 are provided above the lower mold base 2 and are fixedly connected to the lower mold base 2. The four positioning guide pillars 7 are located at the four corners of the lower mold base 2. Four connecting holes 12 are provided at the lower end of the upper mold base 8 and are located at the four corners of the upper mold base 8. The connecting holes 12 correspond to the positioning guide pillars 7, and the positioning guide pillars 7 are slidably connected to the upper mold base 8. An opening groove 1 is provided on the side wall of the positioning guide pillar 7. 7. The upper mold base 8 has four mounting cavities 15, which are connected to the connecting holes 12. The mounting cavities 15 are equipped with sliders 13. A limit block 18 is provided on one side of the slider 13 and is fixedly connected to the slider 13. The limit block 18 and the slider 13 are slidably connected to the upper mold base 8. The limit block 18 is correspondingly provided with the opening slot 17 and is engaged with the positioning guide post 7. The mounting cavity 15 is equipped with a second compression spring 19, which is provided on one side of the slider 13. The two ends of the second compression spring 19 are fixedly connected to the upper mold base 8 and the slider 13, respectively.

[0034] In use: Align the positioning guide post 7 with the connecting hole 12 and insert it to close the upper mold base 8 and the lower mold base 2. When the positioning guide post 7 is inserted into the connecting hole 12 and contacts the limiting block 18, it applies an upward oblique pushing force to the limiting block 18. When the pushing force exceeds the elastic force of the second compression spring 19, the limiting block 18 is pressed into the mounting cavity 15. After the positioning guide post 7 is fully inserted into the connecting hole 12, the opening slot 17 is located on one side of the limiting block 18. At this time, the pushing force applied by the positioning guide post 7 to the limiting block 18 disappears, and the compressed second compression spring 19 applies a pushing force to the limiting block 18, aligning the limiting block 18 with the opening slot 17 and pushing it in. This provides a limiting effect for the positioning guide post 7 inserted into the connecting hole 12, preventing the positioning guide post 7 from falling out of the connecting hole 12 and providing a self-locking function for the closed injection mold. When opening the mold, manually pull the slider 13 to pull the limiting block 18 out of the opening slot 17, and then remove the positioning guide post 7 from the connecting hole 12.

[0035] Please see Figure 1 and Figure 2A mold core 6 is provided above the lower mold base 2 and is fixedly connected to the lower mold base 2. A mold cavity 11 is provided at the lower end of the upper mold base 8 and is correspondingly provided with the mold core 6. A casting seat 9 is provided at the upper end of the upper mold base 8 and is connected to the upper mold base 8 as a whole. The casting seat 9 is connected to the mold cavity 11. After the upper mold base 8 and the lower mold base 2 are closed, the mold core 6 is inserted into the mold cavity 11, and an injection cavity is formed between the mold core 6 and the upper mold base 8. The heated and molten plastic is injected into the injection cavity under high pressure through the casting seat 9. After cooling and solidification, the molded product is obtained.

[0036] Please see Figure 1 and Figure 3 The upper end of the positioning guide post 7 is shaped like a frustum, and the lower part of one end of the limiting block 18 is provided with an arc-shaped chamfer. When the arc-shaped chamfer contacts the positioning guide post 7, it can better press the limiting block 18 into the mounting cavity 15, effectively preventing the inserted positioning guide post 7 from jamming with the limiting block 18.

[0037] Please see Figure 2 and Figure 4 Two elastic pull ropes 10 are provided on both sides of the upper mold base 8. The elastic pull ropes 10 are positioned between the two sliders 13. The two ends of the elastic pull ropes 10 are fixedly connected to the sliders 13. When a pulling force is applied to the elastic pull ropes 10, the two sliders 13 are simultaneously pulled along the mounting cavity 15 under the action of the pulling force, thus pulling the limiting block 18 out of the opening slot 17.

[0038] Please see Figure 2 Guide rings 14 are provided on both sides of the upper mold base 8. There are four guide rings 14, and the guide rings 14 are located on one side of the mounting cavity 15. The guide rings 14 are connected to the upper mold base 8 by screws, and the elastic pull rope 10 is slidably connected to the guide rings 14. The guide rings 14 guide and limit the pulling of the elastic pull rope 10, so that the slider 13 can be pulled simultaneously when the elastic pull rope 10 is pulled.

[0039] Please see Figure 3 A first compression spring 16 is provided at the top of the connecting hole 12, and one end of the first compression spring 16 is fixedly connected to the upper mold base 8. The positioning guide post 7 is fully inserted into the connecting hole 12 and contacts the first compression spring 16, compressing the first compression spring 16. When the limiting block 18 is pulled out from the opening slot 17 and separated from the positioning guide post 7, the compressed first compression spring 16 will apply a pushing force to the positioning guide post 7 inserted in the connecting hole 12, lifting the upper mold base 8 to a certain height, so as to facilitate the opening of the upper mold base 8 and the lower mold base 2.

[0040] Please see Figure 1A base 1 is provided below the lower mold base 2, and the base 1 is connected to the lower mold base 2 by screws. The base 1 is U-shaped. A mounting plate 3 is provided below the lower mold base 2, and the mounting plate 3 is slidably connected to the base 1. An ejector rod 4 is provided above the mounting plate 3, and the lower end of the ejector rod 4 is fixedly connected to the mounting plate 3. The ejector rod 4 is slidably connected to the lower mold base 2 and the mold core 6. An electric push rod 5 is provided below the mounting plate 3, and the two ends of the electric push rod 5 are fixedly connected to the base 1 and the lower mold base 2 respectively. The electric push rod 5 drives the mounting plate 3 to rise and fall. As the mounting plate 3 rises and falls, it drives the ejector rod 4 to rise and fall. When the ejector rod 4 rises and contacts the molded part, it applies an upward thrust to the molded part, and under the action of the thrust, it lifts the molded part.

[0041] Working principle: The positioning guide post 7 is inserted into the connecting hole 12 to close the upper mold base 8 and the lower mold base 2. When the positioning guide post 7 is inserted into the connecting hole 12 and contacts the limiting block 18, it applies an upward oblique pushing force to the limiting block 18. When the pushing force exceeds the elastic force of the second compression spring 19, the limiting block 18 is first pressed into the mounting cavity 15. When the positioning guide post 7 is fully inserted into the connecting hole 12, the opening slot 17 is located on one side of the limiting block 18. At this time, the pushing force applied by the positioning guide post 7 to the limiting block 18 disappears, and the compressed second compression spring 19 applies a pushing force to the limiting block 18, pushing the limiting block 18 into the opening slot 17. This provides a limiting function for the positioning guide post 7 inserted into the connecting hole 12, preventing... The positioning guide post 7 is dislodged from the connecting hole 12, which acts as a self-locking mechanism for the injection mold during mold closing. When the mold is opened, the elastic pull rope 10 is pulled manually, which simultaneously pulls the two sliders 13 along the mounting cavity 15, pulling the limiting block 18 out of the opening slot 17. The positioning guide post 7 is fully inserted into the connecting hole 12 and contacts the first compression spring 16, compressing the first compression spring 16. When the limiting block 18 is pulled out of the opening slot 17 and separates from the positioning guide post 7, the compressed first compression spring 16 will apply a pushing force to the positioning guide post 7 inserted into the connecting hole 12, lifting the upper mold base 8 to a certain height. Then, the positioning guide post 7 can be removed from the connecting hole 12.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the 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 this utility model should be included within the protection scope of this utility model.

Claims

1. An injection mold with self-locking function, comprising a lower mold base (2) and an upper mold base (8), and the upper mold base (8) is arranged above the lower mold base (2), characterized in that: The lower mold base (2) is provided with four positioning guide pillars (7) on its upper part. The positioning guide pillars (7) are fixedly connected to the lower mold base (2) and are located at the four corners of the lower mold base (2). The upper mold base (8) is provided with four connecting holes (12) at its lower end. The connecting holes (12) are located at the four corners of the upper mold base (8) and are corresponding to the positioning guide pillars (7). The positioning guide pillars (7) are slidably connected to the upper mold base (8). The side wall of the positioning guide pillars (7) is provided with an opening groove (17). The upper mold base (8) is provided with four mounting cavities (15). The mounting cavity (15) is connected to the connecting hole (12). A slider (13) is provided inside the mounting cavity (15). A limit block (18) is provided on one side of the slider (13). The limit block (18) is fixedly connected to the slider (13). The limit block (18) and the slider (13) are slidably connected to the upper mold base (8). The limit block (18) is correspondingly provided to the opening slot (17). The limit block (18) is engaged with the positioning guide post (7). A second compression spring (19) is provided inside the mounting cavity (15). The second compression spring (19) is provided on one side of the slider (13). The two ends of the second compression spring (19) are fixedly connected to the upper mold base (8) and the slider (13) respectively.

2. The injection mold with self-locking function according to claim 1, characterized in that: A mold core (6) is provided above the lower mold base (2), and the mold core (6) is fixedly connected to the lower mold base (2). A mold cavity (11) is provided at the lower end of the upper mold base (8), and the mold cavity (11) is correspondingly provided to the mold core (6). A casting seat (9) is provided at the upper end of the upper mold base (8), and the casting seat (9) is connected to the upper mold base (8) as a whole. The casting seat (9) is connected to the mold cavity (11).

3. The injection mold with self-locking function according to claim 1, characterized in that: The upper end of the positioning guide post (7) is shaped like a frustum, and the lower part of one end of the limiting block (18) is provided with an arc-shaped chamfer.

4. The injection mold with self-locking function according to claim 1, characterized in that: Both sides of the upper mold base (8) are provided with elastic pull ropes (10). There are two elastic pull ropes (10), and the elastic pull ropes (10) are located between the two sliders (13). The two ends of the elastic pull ropes (10) are fixedly connected to the sliders (13).

5. An injection mold with a self-locking function according to claim 4, characterized in that: Guide rings (14) are provided on both sides of the upper mold base (8). There are four guide rings (14), and the guide rings (14) are located on one side of the mounting cavity (15). The guide rings (14) are connected to the upper mold base (8) by screws, and the elastic pull rope (10) is slidably connected to the guide rings (14).

6. The injection mold with self-locking function according to claim 1, characterized in that: A first compression spring (16) is provided at the top of the connecting hole (12), and one end of the first compression spring (16) is fixedly connected to the upper mold base (8).

7. An injection mold with a self-locking function according to claim 1, characterized in that: A base (1) is provided below the lower mold base (2), and the base (1) is connected to the lower mold base (2) by screws. The base (1) is U-shaped. A mounting plate (3) is provided below the lower mold base (2), and the mounting plate (3) is slidably connected to the base (1). An ejector rod (4) is provided above the mounting plate (3), and the lower end of the ejector rod (4) is fixedly connected to the mounting plate (3). The ejector rod (4) is slidably connected to the lower mold base (2) and the mold core (6). An electric push rod (5) is provided below the mounting plate (3), and the two ends of the electric push rod (5) are fixedly connected to the base (1) and the lower mold base (2) respectively.

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