Core-pulling structure of injection mold

Abstract

The utility model relates to injection mold technical field, especially injection mold core structure, including lower mould and upper mould, the upper surface of lower mould is opened with lower mould cavity and mounting groove, is provided with core pulling assembly in mounting groove, core pulling assembly includes the sliding seat slidingly connected in mounting groove, the side wall of lower mould cavity is opened with horizontal tunnel and inclined tunnel, horizontal tunnel and inclined tunnel are slidingly connected with first mould core and second mould core respectively, and the horizontal connecting rod is fixedly connected between first mould core and sliding seat, and the end of second mould core is coaxially fixedly connected with inclined connecting rod, the side wall of sliding seat is opened with vertical slide groove, and the sliding block is slidingly connected in vertical slide groove, and the rotating shaft is rotatably connected between sliding block and inclined connecting rod, and the side of sliding seat away from lower mould cavity is provided with first guide slope, the bottom of upper mould is fixedly connected with drive block, and the second guide slope is equipped on drive block, the utility model solves the problem that the mould is complicated and the cost is high because of the multiple drive equipment of multidirectional mould core.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically to a core-pulling structure for injection molds. Background Technology

[0002] Injection molds are core tools in modern industrial production. Through precise heating, high-pressure injection, and rapid cooling of plastic raw materials, they efficiently produce plastic products with complex shapes and precise dimensions. These molds are widely used in packaging, daily necessities, automobiles, electronics, and many other fields, meeting the demand for high-quality plastic products across various industries. Injection molds not only improve production efficiency and reduce costs but also drive innovation in product design.

[0003] The core-pulling mechanism is a crucial part of mold design, especially when dealing with plastic products featuring sidewall through-holes, grooves, or bosses. These structures allow the molded part (movable core) to be extracted from the plastic product when the mold opens, ensuring smooth demolding.

[0004] When injection molded products have many side holes, grooves, bevels, or bosses, the mold core-pulling structure needs to be designed with multiple cores in different directions. These cores have different pulling directions during the core-pulling process, and usually require multiple driving devices to complete the core-pulling work, which not only increases the complexity of the mold, but also increases the production cost of the product. Utility Model Content

[0005] The purpose of this invention is to provide a core-pulling structure for injection molds, which solves the problems of complex molds and high costs caused by the need for multiple driving devices for multi-directional cores.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A core-pulling structure for an injection mold includes a lower mold and an upper mold. The upper surface of the lower mold has a lower cavity, and the upper surface of the lower mold near the lower cavity has an installation groove. A core-pulling assembly is disposed within the installation groove. The core-pulling assembly includes a slide block slidably connected within the installation groove. A reset groove is formed at the bottom of the slide block near the lower cavity. A spring connects the bottom of the reset groove to the side wall of the installation groove. A horizontal through groove and an inclined through groove are formed on the side wall of the lower mold cavity, communicating with the installation groove. A first core-pulling component is slidably connected within the horizontal through groove. A first mold core is fixedly connected to the slide block by a horizontal connecting rod. A second mold core is slidably connected in the inclined through groove. An inclined connecting rod is coaxially fixedly connected to one end of the second mold core near the slide block. A vertical sliding groove is provided on the side wall of the slide block. A slider is slidably connected in the vertical sliding groove. A rotating shaft is rotatably connected between the slider and the inclined connecting rod. A first guide slope is provided on the side of the slide block away from the lower mold cavity. A driving block is fixedly connected to the bottom of the upper mold. A second guide slope is provided on the driving block corresponding to the first guide slope.

[0008] Furthermore, a guide rail is provided at the bottom of the mounting groove, and the slide block is slidably connected to the guide rail.

[0009] Furthermore, a limiting pin is provided at the bottom of the mounting groove, and the limiting pin is located on the side of the slide away from the lower mold cavity.

[0010] Furthermore, an inclined guide rod is fixedly connected to the lower surface of the upper mold, and an inclined slot corresponding to the inclined guide rod is opened on the top of the slide block. The inclined guide rod and the second guide slope have the same inclination angle.

[0011] Furthermore, the core-pulling assembly is provided in multiple sets.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] This application uses the driving block and guide slope driven by the upper mold as a single driving source, without the need for additional hydraulic / motor or other independent driving equipment. It can simultaneously complete the cavity entry and core pulling of mold cores in different directions through the linkage of the slide block with the horizontal connecting rod and the tilting connecting rod, the slider and the rotating shaft, thus solving the problem of mold complexity and high cost caused by the need for multiple driving equipment for multi-directional mold cores in the background technology. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a partial structural diagram of the lower mold in this utility model;

[0016] Figure 3 This is a cross-sectional view of the present invention.

[0017] 1. Lower mold; 101. Lower mold cavity; 102. Mounting groove; 103. Horizontal through groove; 104. Inclined through groove; 2. Upper mold; 3. Slide block; 301. Reset groove; 302. Vertical slide groove; 303. Inclined slot; 4. Spring; 5. First mold core; 6. Horizontal connecting rod; 7. Second mold core; 8. Inclined connecting rod; 9. Slider; 10. Rotating shaft; 11. First guide slope; 12. Drive block; 13. Second guide slope; 14. Guide rail; 15. Limiting pin; 16. Inclined guide rod. Detailed Implementation

[0018] like Figures 1 to 3 As shown, a core-pulling structure for an injection mold includes a lower mold 1 and an upper mold 2. The upper surface of the lower mold 1 has a lower mold cavity 101. A mounting groove 102 is formed on the upper surface of the lower mold 1 near the lower mold cavity 101. A core-pulling assembly is disposed within the mounting groove 102. The core-pulling assembly includes a slide block 3 slidably connected within the mounting groove 102. A reset groove 301 is formed at the bottom of the slide block 3 near the lower mold cavity 101. A spring 4 connects the bottom of the reset groove 301 to the side wall of the mounting groove 102. A horizontal through groove 103 and an inclined through groove 104 communicating with the mounting groove 102 are formed on the side wall of the lower mold cavity 101. The horizontal through groove 103... A first mold core 5 is slidably connected to the inner mold core 5. A horizontal connecting rod 6 is fixedly connected between the first mold core 5 and the slide block 3. A second mold core 7 is slidably connected to the inclined through groove 104. An inclined connecting rod 8 is coaxially fixedly connected to one end of the second mold core 7 near the slide block 3. A vertical sliding groove 302 is provided on the side wall of the slide block 3. A slider 9 is slidably connected to the vertical sliding groove 302. A rotating shaft 10 is rotatably connected between the slider 9 and the inclined connecting rod 8. A first guide slope 11 is provided on the side of the slide block 3 away from the lower mold cavity 101. A driving block 12 is fixedly connected to the bottom of the upper mold 2. A second guide slope 13 corresponding to the first guide slope 11 is provided on the driving block 12.

[0019] The bottom of the mounting groove 102 is provided with a guide rail 14, and the slide block 3 is slidably connected to the guide rail 14. The guide rail 14 at the bottom of the mounting groove 102 limits the sliding trajectory of the slide block 3, preventing the slide block 3 from deviating or jamming when moving horizontally, ensuring the linearity of the slide block 3 driving the mold core movement, and further improving the positioning accuracy and core pulling stability of the mold core.

[0020] The bottom of the mounting groove 102 is provided with a limiting pin 15, which is located on the side of the slide block 3 away from the lower mold cavity 101. The limiting pin 15 can limit the backward limit position of the slide block 3 when the mold is opened, and prevent the slide block 3 from sliding excessively when the spring 4 is reset, causing the first mold core 5 and the second mold core 7 to disengage from the horizontal through groove 103 and the inclined through groove 104.

[0021] An inclined guide rod 16 is fixedly connected to the lower surface of the upper mold 2. An inclined slot 303 corresponding to the inclined guide rod 16 is opened on the top of the slide block 3. The inclined guide rod 16 and the second guide inclined surface 13 have the same inclination angle. When the mold is closed, the inclined guide rod 16 is inserted into the inclined slot 303 of the slide block 3, which can assist the drive block 12 in applying a stable driving force to the slide block 3, avoiding the tilting and jamming caused by uneven force on the slide block 3 when a single guide inclined surface is in contact, and enhancing the reliability of the drive.

[0022] The core-pulling assembly is provided in multiple sets; the multiple sets of core-pulling assemblies can be flexibly arranged according to the distribution requirements of multiple side holes, grooves, inclined surfaces / bodies of injection molded products, without the need to design new drive structures, so as to adapt to more complex multi-side feature products and improve the versatility and adaptability of the mold.

[0023] Working principle:

[0024] When the mold is closed, the upper mold 2 moves downward, causing the bottom-fixed drive block 12 to descend synchronously. The second guide slope 13 of the drive block 12 contacts the first guide slope 11 of the slide block 3 in the mounting groove 102 of the lower mold 1. As the upper mold 2 continues to descend, the squeezing force of the guide slope pushes the slide block 3 to slide along the mounting groove 102 towards the lower mold cavity 101. At this time, the spring 4 between the slide block 3 and the side wall of the mounting groove 102 is compressed. When the slide block 3 moves, it drives the first mold core 5, which is slidably connected in the horizontal through groove 103, to enter the lower mold cavity 101 in the horizontal direction through the horizontal connecting rod 6. Simultaneously, the slide block 3 drives the second mold core 7 through the inclined connecting rod 8. Since one end of the inclined connecting rod 8 is coaxially fixed with the second mold core 7 and the other end is rotatably connected to the slider 9 through the rotating shaft 10, the slider 9 can slide in the vertical groove 302 of the slide block. Therefore, when the slide block 3 moves, the inclined connecting rod 8 compensates for the angle difference through the vertical sliding of the slider 9, and drives the second mold core 7 to enter the lower mold cavity 101 along the inclined through groove 104. After the upper mold is completely closed, the first mold core 5 and the second mold core 7 are precisely in place, and together with the lower mold cavity 101, they form a complete plastic part molding cavity, and then plastic injection molding is performed.

[0025] After the plastic part is formed, the upper mold 2 moves upward, driving the drive block 12 to rise synchronously. The second guide slope 13 of the drive block 12 disengages from the first guide slope 11 of the slide block 3. The spring 4 recovers its elastic deformation and pulls the slide block 3 to slide away from the lower mold cavity 101. When the slide block 3 retracts, the horizontal connecting rod 6 pulls the first mold core 5 to disengage from the side of the plastic part to the hole / boss along the horizontal through groove 103. At the same time, the inclined connecting rod 8 slides in the opposite direction in the vertical slide groove 302 through the slider 9, driving the second mold core 7 to disengage from the side of the plastic part to the slope / boss along the inclined through groove 104. After the two mold cores are completely extracted, the mold continues to open, and the plastic part is ejected from the lower mold cavity 101 through the ejection mechanism (not mentioned, it is a conventional design), completing one injection-core pulling-demolding cycle.

[0026] This utility model replaces multiple independent drive devices by linking the drive block 12 and the slide 3, reducing hydraulic / motor, pipeline / line and other components, reducing the energy consumption and maintenance cost of the drive system, and has significant economic benefits in the long run.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An injection mold core-pulling structure, characterized by: The system includes a lower mold (1) and an upper mold (2). The upper surface of the lower mold (1) has a lower mold cavity (101). The upper surface of the lower mold (1) near the lower mold cavity (101) has an installation groove (102). A core-pulling assembly is provided in the installation groove (102). The core-pulling assembly includes a slide block (3) slidably connected in the installation groove (102). A reset groove (301) is provided at the bottom of the slide block (3) near the lower mold cavity (101). A spring (4) is connected between the bottom of the reset groove (301) and the side wall of the installation groove (102). A horizontal through groove (103) and an inclined through groove (104) communicating with the installation groove (102) are provided on the side wall of the lower mold cavity (101). A first mold core is slidably connected in the horizontal through groove (103). (5) A horizontal connecting rod (6) is fixedly connected between the first mold core (5) and the slide (3). A second mold core (7) is slidably connected in the inclined through groove (104). An inclined connecting rod (8) is coaxially fixedly connected to one end of the second mold core (7) near the slide (3). A vertical sliding groove (302) is provided on the side wall of the slide (3). A slider (9) is slidably connected in the vertical sliding groove (302). A rotating shaft (10) is rotatably connected between the slider (9) and the inclined connecting rod (8). A first guide slope (11) is provided on the side of the slide (3) away from the lower mold cavity (101). A driving block (12) is fixedly connected to the bottom of the upper mold (2). A second guide slope (13) corresponding to the first guide slope (11) is provided on the driving block (12).

2. The injection mold core-pulling structure as described in claim 1, characterized in that: The bottom of the mounting groove (102) is provided with a guide rail (14), and the slide (3) is slidably connected to the guide rail (14).

3. The injection mold core-pulling structure of claim 1, wherein: The bottom of the mounting groove (102) is provided with a limiting pin (15), which is located on the side of the slide block (3) away from the lower mold cavity (101).

4. The injection mold core-pulling structure as described in claim 1, characterized in that: An inclined guide rod (16) is fixedly connected to the lower surface of the upper mold (2), and an inclined slot (303) corresponding to the inclined guide rod (16) is opened on the top of the slide block (3). The inclined angle of the inclined guide rod (16) and the second guide slope (13) are the same.

5. The core-pulling structure of an injection mold according to claim 1, wherein: The core-pulling assembly is provided in multiple sets.

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