Mold core-pulling structure and mold assembly

Abstract

The utility model relates to the technical field of molds, and provides a mold core-pulling structure and a mold assembly. The mold core-pulling structure comprises a slide way arranged on a first mold, a core rod capable of sliding in the slide way in a guiding manner and a driving molded surface arranged on a second mold, and an elastic piece acting on the core rod is arranged on the first mold; a forming mold cavity used for injection molding of a product is defined between the first mold and the second mold after mold closing, and the sliding way is formed in a matching molded surface, corresponding to the driving molded surface, of the first mold and penetrates into the forming mold cavity; the core rod is provided with an injection molding position partially extending into the forming mold cavity and a mold stripping position retreating from the forming mold cavity, the driving molded surface can push the core rod to slide to the injection molding position in the mold closing process, the driving molded surface is separated from the core rod in the mold opening process, and the core rod returns to the mold stripping position under the action of the elastic piece. The mold core-pulling structure disclosed by the utility model is beneficial to providing a simple and efficient mold opening and core-pulling scheme.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a mold core-pulling structure. This utility model also relates to a mold assembly employing the above-mentioned mold core-pulling structure. Background Technology

[0002] With the trend towards lightweighting and functional integration in vehicles, injection-molded products are increasingly used in vehicle components, such as door handles, interior trim clips, and wiring harness connectors. These components are often designed with undercut holes to meet assembly positioning or load-bearing requirements, and their molding generally relies on core-pulling structures for demolding.

[0003] In injection molding processes, for products with undercut hole structures, traditional techniques generally use hydraulic cylinders to drive the core-pulling mechanism for demolding. This requires an internal or external hydraulic circuit system to drive the core-pulling action and control the movement of the core-pulling slider. However, the hydraulic cylinder system relies on complex hydraulic pipelines and multi-layer sealing structures. Under high-frequency and high-pressure conditions, the sealing elements are prone to aging and failure, causing hydraulic oil to seep into the mold cavity, resulting in oil stains or localized material deformation on the surface of the plastic part. In order to avoid motion interference, the front mold core-pulling mechanism must be forcibly equipped with an anti-collision protection device, which forces the mold opening and closing stroke to be extended, which is not conducive to efficient molding and demolding of injection molded products.

[0004] Furthermore, the core-pulling structure driven by hydraulic cylinders significantly increases the complexity of the mold structure and poses a risk of misalignment in the timing of the hydraulic cylinder movements. If the core-pulling is not completed in time before the mold closing action is triggered, the undercut part will be directly damaged, causing structural damage to the product. This makes it difficult to provide a simple and efficient mold opening and core-pulling solution. Utility Model Content

[0005] In view of this, the present invention aims to propose a mold core-pulling assembly to provide a simple and efficient mold opening and core-pulling solution.

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

[0007] A mold core-pulling structure includes a slide rail on a first mold, a core rod that can be guided and slidably in the slide rail, and a driving surface on a second mold, wherein the first mold is provided with an elastic element acting on the core rod;

[0008] The first mold and the second mold, when closed, can form a molding cavity for injection molded products. The slide is opened on the mating surface of the first mold corresponding to the driving surface and extends into the molding cavity.

[0009] The core rod has an injection position partially extending into the forming die cavity and an ejection position partially exposed outside the matching profile; during the clamping process, the driving profile can push the core rod to slide to the injection position, and during the unclamping process, the driving profile is separated from the core rod, and the core rod returns to the ejection position under the action of the elastic member.

[0010] Further, the sliding channel is arranged perpendicularly to the unclamping direction, and the driving profile is arranged obliquely relative to the unclamping direction.

[0011] Further, the oblique angle of the driving profile relative to the unclamping direction is between 10° and 20°.

[0012] Further, the ratio of the sliding distance of the core rod between the injection position and the ejection position to the size of the core rod extending into the forming die cavity at the injection position is not less than 2.

[0013] Further, the first die is provided with a sliding sheet, and the driving profile is located on the sliding sheet.

[0014] Further, the sliding channel comprises sliding block segments and rod body segments connected in sequence along the direction from the matching profile to the forming die cavity, and the core rod comprises a driving sliding block and a core rod body connected to the driving sliding block; the driving sliding block is slidingly arranged in the sliding block segments, and when the core rod is in the ejection position, the driving sliding block is partially exposed outside the matching profile to receive the pushing of the driving profile.

[0015] Further, the elastic member comprises a spring arranged in the sliding block segments; the spring is sleeved on the core rod body and acts between the driving sliding block and the bottom of the sliding block segments.

[0016] Further, the driving sliding block is in a columnar shape, and a limiting groove is arranged on the driving sliding block; an installation groove is arranged on the first die in proximity to the matching profile and in communication with the sliding block segments, and a stopper is arranged in the installation groove and inserted into the limiting groove to limit the driving sliding block from being pulled out of the sliding block segments.

[0017] Further, the core rod body comprises a rod body slidingly arranged in the rod body segments and a head and an end arranged at two ends of the rod body respectively; a connecting groove is arranged at the bottom of the driving sliding block, and the head is inserted into the connecting groove to connect the core rod body to the driving sliding block; when the core rod is in the injection position, the end extends into the forming die cavity.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] The core rod can slide in the forming die cavity, so that the core rod core pulling action is completed, and the core rod has an injection position and a die position, and the sliding of the core rod in the slide is completed through the cooperation of the driving profile and the corresponding matching profile, the die action is completed, the core rod returns to the die position through the action of the elastic element, the opening action is completed, the structure is simple, and the sliding is smooth, and the oil circuit system does not need to be introduced, thereby a simple and efficient mold opening core pulling scheme is provided.

[0020] In addition, the arrangement direction of the slide is perpendicular to the opening direction, and the arrangement direction of the driving profile is inclined relative to the opening direction, which is beneficial to guarantee the sliding stroke of the core rod, and is also conducive to the arrangement of other components in the mold, and is beneficial to design implementation. The inclination angle between the driving profile and the opening direction is set to be between 10°-20°, so that the part of the core rod exposed outside the matching profile can slide on the driving profile more smoothly, thereby converting the die action of the second mold into driving force for the core rod, which is beneficial to guarantee the smooth sliding of the core rod and reduce the occurrence of interference or jamming, and is conducive to design implementation. The ratio of the sliding distance of the core rod to the size of the core rod extending into the forming die cavity at the injection position is greater than or equal to 2, which is conducive to guaranteeing the smoothness of the sliding stroke of the core rod and reducing the occurrence of interference or jamming, and is beneficial to design implementation.

[0021] In addition, the sliding piece is arranged, which is convenient for arranging the driving profile, and the sliding piece can be replaced after wear, which is beneficial to design implementation. The slide is designed as two parts of a sliding block section and a rod body section, which is beneficial to guarantee the sliding of the core rod in the slide, limit the sliding range of the core rod, guarantee the sliding of the core rod along the slide, and make the core rod include a driving sliding block and a core rod body, so as to facilitate the arrangement of the core rod in the slide. The driving of the driving profile is facilitated by the arrangement of the driving sliding block, so as to drive the core rod to slide along the slide, and the structure is simple and convenient for processing and manufacturing, which is beneficial to design implementation.

[0022] Furthermore, the elastic element includes a spring sleeved on the core rod body, and the spring is located in the sliding block section, so that the position change of the core rod body is completed through the arrangement of the spring, which is conducive to design implementation. The driving sliding block is prevented from being pulled out of the slide through the arrangement of the limiting groove and the stopper, which is conducive to preventing the driving sliding block from being excessively pulled out of the slide during opening, and affecting other structures in the mold, and the structure is simple and convenient for processing, which is beneficial to design implementation. The core rod body and the driving sliding block are arranged in a plug-in connection mode, which is convenient for processing of the core rod body and the driving sliding block, and facilitates assembly of the core rod body and the driving sliding block, which is beneficial to design implementation.

[0023] The utility model discloses still propose a kind of mould assembly, and the mould assembly uses the mould core pulling structure as described above.

[0024] The mold assembly described in this utility model has the same beneficial effects as the mold core-pulling structure described above, compared with the prior art, so it will not be described again here. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0026] Figure 1 This is a partial structural diagram of the mold core-pulling structure described in this embodiment of the present invention assembled in the mold assembly;

[0027] Figure 2 This is a schematic diagram of the structure of the first mold described in an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the mold assembly described in an embodiment of the present utility model;

[0029] Figure 4 for Figure 3 Cross-sectional view at point AA;

[0030] Figure 5 for Figure 1 Enlarged view of point A;

[0031] Figure 6 for Figure 2 Enlarged view of point B;

[0032] Figure 7 This is a schematic diagram of the mold core-pulling structure described in an embodiment of the present utility model;

[0033] Explanation of reference numerals in the attached figures:

[0034] 1. First mold; 2. Second mold;

[0035] 3. Slide;

[0036] 301. Slider segment; 302. Rod segment;

[0037] 4. Core rod;

[0038] 401. Drive slider; 402. Core rod body;

[0039] 4011, Limiting groove; 4012, Connecting groove; 4021, Rod body; 4022, Head; 4023, End;

[0040] 5. Elastic element; 6. Sliding plate; 7. Mounting groove; 8. Stop block;

[0041] s, driving profile; t, mating profile; k, injection-molded product. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0043] In the description of the utility model, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "outer" appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, if the terms "first", "second" appear, they are also only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0044] Taking the mold core pulling structure described in the utility model as an example, the orientation words such as "upper", "lower", "left", "right", "front", "back" used in the embodiments are defined based on the up-down direction (also called height direction), left-right direction (also called width direction) and front-back direction (also called length direction) of the mold core pulling structure. "Inner" and "outer" are defined based on the contour of the corresponding component, for example, "inner" and "outer" are defined based on the contour of the mold core pulling structure, the side close to the middle of the mold core pulling structure is "inner", and vice versa.

[0045] In addition, in the description of the utility model, unless otherwise explicitly limited, the terms "mounting", "connection", "connecting", "connecting piece" should be understood broadly. For example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood in combination with the specific circumstances.

[0046] The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0047] Embodiment one

[0048] The embodiment relates to a mold core pulling structure, aiming to provide a simple and efficient mold opening and core pulling scheme by optimizing the structure of the mold core pulling structure.

[0049] In vehicles, in order to design light weight and consider aesthetics, some vehicle parts are made of mold injection. At present, the injection product k is produced by mold injection. The common mold generally includes a panel, a first mold 1, a second mold 2 and a bottom plate. When the injection product k is produced, the first mold 1 and the second mold 2 form a forming cavity of the injection product k after clamping. When the injection product k has a hole, a recess or a boss, etc. Special structure, core pulling structure is used to complete the molding of the special structure on the injection product k through core pulling action.

[0050] When the reverse hole structure is formed, the front mold core pulling structure is generally used to complete the core pulling action. In the prior art, an external or internal oil circuit is generally needed to drive the core pulling structure to complete the core pulling action by an oil cylinder. However, when the oil cylinder is used for driving, an anti-collision sensing switch needs to be arranged to prevent the core pulling structure or the oil cylinder from colliding with the mold. At the same time, the design of the oil circuit and the sealing problem of the oil cylinder itself will cause oil leakage. The oil cylinder may also be pulled off the product before the core pulling is completed, which reduces the product quality of the injection product k produced by the front mold core pulling structure.

[0051] Therefore, the mold core pulling structure is provided in the embodiment to improve the product quality of the injection product k. As shown in Figures 1 to 7 The mold core pulling structure in the embodiment includes a slide 3 provided on the first mold 1, a core rod 4 slidably guided in the slide 3, and a driving profile s provided on the second mold 2. The first mold 1 is provided with an elastic member 5 acting on the core rod 4.

[0052] The first mold 1 and the second mold 2 can be clamped to form a forming cavity for the injection product k. The slide 3 is provided on the first mold 1 corresponding to the driving profile s, and penetrates into the forming cavity. The core rod 4 has an injection position partially extending into the forming cavity, and an ejection position partially exposed outside the matching profile t. During clamping, the driving profile s can push the core rod 4 to slide to the injection position. During opening, the driving profile s is separated from the core rod 4, and the core rod 4 returns to the ejection position under the action of the elastic member 5.

[0053] As arranged above, the core-pulling structure in the embodiment is arranged by the slide 3, the core rod 4 slidingly arranged in the slide 3, the driving profile s arranged on the second mold 2, and the elastic member 5 arranged on the core rod 4, so that the core rod 4 can slide in the molding cavity to facilitate the core-pulling action of the core rod 4 to be completed, and the core rod 4 has an injection position and a mold opening position, and the sliding of the core rod 4 in the slide 3 is completed by the cooperation of the driving profile s and the corresponding matching profile t, the mold closing action is completed, the core rod 4 returns to the mold opening position by the action of the elastic member 5, and the mold opening action is completed. The structure is simple, the sliding is smooth, and the oil circuit system does not need to be introduced, which avoids pollution caused by oil leakage of the oil circuit, helps to protect the product quality of the injection product k, and is beneficial to design and implementation.

[0054] Specifically, in the embodiment, in combination with Figures 1 to 7 As shown, as an exemplary structure, in order to facilitate the core-pulling structure to complete the core-pulling action, the slide 3 in the embodiment is arranged perpendicular to the mold opening direction, and the driving profile s is arranged inclined relative to the mold opening direction. In this way, when the first mold 1 and the second mold 2 are opened, the core rod 4 is pushed to slide to the injection position by the inclined driving profile s, so that the arrangement direction of the slide 3 is perpendicular to the mold opening direction, and the arrangement direction of the driving profile s is arranged inclined relative to the mold opening direction, which is beneficial to protect the sliding stroke of the core rod 4, and helps to arrange other components in the mold, which is beneficial to design and implementation.

[0055] More specifically, in order to facilitate the arrangement of the driving profile s, the first mold 1 in the embodiment is provided with a slide piece 6, and the driving profile s is located on the slide piece 6. The slide piece 6 in the embodiment is arranged in a square block shape and is bolted on the first mold 1. The slide piece 6 is inclined relative to the mold opening direction and is fixed on the first mold 1. The driving profile s is located on the side of the slide piece 6 facing the core rod 4. Through the arrangement of the slide piece 6, the arrangement of the driving profile s is facilitated, and the slide piece 6 can be replaced after wear. The structure is simple, easy to process, and beneficial to design and implementation.

[0056] In order to better protect the smooth pushing of the driving profile s to the core rod 4, the inclination angle of the driving profile s relative to the mold opening direction in the embodiment is between 10°-20°. In the embodiment, it can be 10°, of course, the inclination angle can also be 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19° or 20°. Only the driving profile s can smoothly push the core rod 4, and the other matching structures in the mold are arranged according to the requirements. The inclination angle of the driving profile s relative to the mold opening direction is between 10°-20°, which is beneficial to protect the smooth sliding of the core rod 4, reduce the interference or jamming, and is beneficial to design and implementation.

[0057] Furthermore, in order to better ensure the smooth sliding of the core rod 4 within the slide rail 3, in this embodiment, the ratio of the sliding distance of the core rod 4 between the injection position and the ejection position to the dimension of the core rod 4 extending into the molding cavity at the injection position is not less than 2. This ensures that the ratio of the sliding distance of the core rod 4 to the dimension of the core rod 4 extending into the molding cavity at the injection position is greater than or equal to 2, which helps to ensure the smooth sliding stroke of the core rod 4, reduces interference or jamming, and facilitates design and implementation.

[0058] In this embodiment, combined with Figure 4 As shown, in order to better ensure the sliding effect of the core rod 4, the slide 3 in this embodiment includes a slider section 301 and a rod section 302. The slider section 301 and the rod section 302 are connected sequentially along the direction from the mating surface t to the molding cavity. The core rod 4 includes a driving slider 401 and a core rod body 402 connected to the driving slider 401. The driving slider 401 is slidably disposed in the slider section 301. When the core rod 4 is in the demolding position, part of the driving slider 401 remains outside the mating surface t to receive the push of the driving surface s. The slide rail 3 includes a slider section 301 and a rod section 302, which facilitates the sliding of the core rod 4 within the slide rail 3 and limits the sliding range of the core rod 4, ensuring that the core rod 4 slides along the slide rail 3. The core rod 4, including the drive slider 401 and the core rod body 402, facilitates the arrangement of the core rod 4 within the slide rail 3. The setting of the drive slider 401 facilitates the drive surface s to drive the drive slider 401 to slide, thereby driving the core rod 4 to slide along the slide rail 3. Moreover, the structure is simple, easy to process and manufacture, and conducive to design and implementation.

[0059] Specifically, in combination Figures 1 to 7 As shown, in order to facilitate the processing and manufacturing of the core rod 4 and to prevent the core rod 4 from rotating, the drive slider 401 in this embodiment is cylindrical, and the drive slider 401 is provided with a limiting groove 4011. Correspondingly, near the mating surface t, a mounting groove 7 communicating with the slider section 301 is provided on the first mold 1, and a stop block 8 is provided in the mounting groove 7. The stop block 8 is inserted into the limiting groove 4011 to restrict the drive slider 401 from coming out of the slider section 301, so that the drive slider 401 is cylindrical, which is convenient for processing and easy to slide. The setting of the limiting groove 4011 and the stop block 8 helps to prevent the drive slider 401 from coming out of the slider section 301, and helps to prevent the drive slider 401 from excessively coming out of the slide rail 3 when the mold is opened, thus affecting other structures in the mold. The structure is simple, easy to process, and easy to design and implement.

[0060] More specifically, the side of the stop block 8 facing the limiting groove 4011 abuts against the limiting groove 4011. The stop block 8 is fixed in the mounting groove 7 by bolts. When the drive slider 401 is pushed by the elastic member 5 and tends to disengage from the slide rail 3, the stop block 8 fixed in the mounting groove 7 can resist the drive slider 401 to prevent the drive slider 401 from disengaging from the slider section 301.

[0061] In addition, in order to facilitate the processing and assembly of the core rod body 402, in combination with Figures 1 to 7 As shown, the core rod body 402 in the embodiment includes a rod body 4021 slidingly arranged in the rod body segment 302, and a head 4022 and an end 4023 located at both ends of the rod body 4021, respectively. The bottom of the driving sliding block 401 is provided with a connecting groove 4012, and the head 4022 is inserted into the connecting groove 4012 to connect the core rod body 402 to the driving sliding block 401. When the core rod 4 is in the injection position, the end 4023 extends into the molding cavity. The end 4023 of the core rod body 402 can be arranged correspondingly in the molding cavity according to the structure of the to-be-formed hole in the to-be-formed injection product k. The end 4023 of the core rod body 402 can be processed according to the shape and size of the to-be-formed hole. At the same time, the head 4022 of the core rod body 402 is assembled on the driving sliding block 401 in the form of insertion, which facilitates the replacement of the core rod body 402 corresponding to the to-be-formed hole, so that the core rod body 402 and the driving sliding block 401 are connected in the form of insertion, which facilitates the processing of the core rod body 402 and the driving sliding block 401, and facilitates the assembly of the core rod body 402 and the driving sliding block 401, and is beneficial to design and implementation.

[0062] More specifically, the connecting groove 4012 in the embodiment can be a T-shaped groove, and the head 4022 of the core rod body 402 is arranged in the form of a T-shaped block structure. When assembling, the core rod body 402 is inserted into the driving sliding block 401 from one side of the connecting groove 4012, so that the head 4022 of the core rod body 402 is in the form of a T-shaped block and the connecting groove 4012 is in the form of a T-shaped groove. This facilitates the constraint of the positional relationship between the core rod body 402 and the driving sliding block 401, and has a simple structure, which is convenient for processing and manufacturing, and is beneficial to design and implementation.

[0063] In addition, in order to facilitate the arrangement of the elastic member 5, the elastic member 5 in the embodiment can include a spring, which is arranged in the sliding block segment 301 and is sleeved on the core rod body 402 and acts between the driving sliding block 401 and the bottom of the sliding block segment 301. The elastic member 5 includes a spring sleeved on the core rod body 402, and the spring is located in the sliding block segment 301, which has a simple structure and is beneficial to the change of the position of the core rod body 402 through the arrangement of the spring, and is beneficial to design and implementation.

[0064] Specifically, in order to facilitate the sliding of the driving slider 401, the length of the slider section 301 in the embodiment is greater than the length of the driving slider 401, the spring is sleeved on the core rod 4 and located in the slider section 301, one end of the spring can abut against the driving slider 401, and the other end of the spring can abut against the inner wall of the slider section 301, when the driving slider 401 slides in the slider section 301, the spring can be compressed, so that the driving slider 401 drives the end portion 4023 of the core rod 4 to slide by the elasticity of the spring itself when the mold is opened, and the core pulling operation is completed.

[0065] The mold core pulling structure of the embodiment, when assembling, first selects the corresponding core rod body 402 according to the requirements of the to-be-processed injection molded product k, assembles the core rod body 402 on the driving slider 401, and then assembles the core rod 4 in the slide 3. When the mold is closed, the first mold 1 and the second mold 2 move towards each other, during the movement, the driving profile s on the slide 6 pushes the driving slider 401, the driving slider 401 compresses the elastic member 5 in the slider section 301, after the mold is closed, the core rod 4 slides to the injection position, and the end portion 4023 of the core rod 4 is located at the preset position in the forming mold. When the mold is opened, the first mold 1 and the second mold 2 move away from each other, during the movement, the driving slider 401 slides along the driving profile s of the slide 6 under the drive of the elastic member 5, drives the core rod 4 to return to the ejection position, and the mold opening operation is completed.

[0066] The mold core pulling structure in the embodiment, through the settings of the slide 3, the core rod 4 slidingly arranged in the slide 3, the driving profile s arranged on the second mold 2, and the elastic member 5 arranged on the core rod 4, the core rod 4 can slide in the forming mold cavity, so that the core pulling action of the core rod 4 is completed, the core rod 4 has an injection position and an ejection position, and the sliding of the core rod 4 in the slide 3 is completed through the cooperation of the driving profile s and the corresponding matching profile t, the core rod 4 can be quickly driven to move to the injection position while the mold closing action is completed, and the core rod 4 can return to the ejection position through the action of the elastic member 5 while the mold is opened, the mold opening action is completed, the structure is simple, the sliding is smooth, and the oil circuit system does not need to be introduced, which avoids the pollution caused by oil leakage of the oil circuit, helps to protect the product quality of the injection molded product k, and is beneficial to design and implementation.

[0067] Embodiment two

[0068] The embodiment relates to a mold assembly, and the mold assembly in the embodiment adopts the mold core pulling structure in embodiment one.

[0069] The mold assembly in the embodiment, through adopting the mold core-pulling structure in the embodiment one, through the setting of the slide 3, the core rod 4 slidably arranged in the slide 3, the driving profile s arranged on the second mold 2 and the elastic element 5 arranged on the core rod 4, the core rod 4 can slide in the forming mold cavity, so that the core-pulling action of the core rod 4 is completed, the core rod 4 has an injection position and a mold opening position, the sliding of the core rod 4 in the slide 3 is completed through the cooperation of the driving profile s and the corresponding matching profile t, the mold closing action is completed, the core rod 4 returns to the mold opening position through the action of the elastic element 5, the mold opening action is completed, the structure is simple, and the sliding is smooth, meanwhile, the oil circuit system is not needed to be introduced, and the pollution caused by the oil leakage of the oil circuit is avoided, the product quality of the injection product k is helped to be ensured, and the design implementation is beneficial.

[0070] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A mold core-pulling structure, characterized in that: a slide (3) is arranged on a first mold (1), a core rod (4) is guided to slide in the slide (3), and a driving profile (s) is arranged on a second mold (2), and the first mold (1) is provided with an elastic member (5) acting on the core rod (4); the first mold (1) and the second mold (2) can form a molding cavity for injection molding a product (k) when the molds are closed, the slide (3) is arranged on a matching profile (t) of the first mold (1) corresponding to the driving profile (s) and penetrates into the molding cavity; the core rod (4) has an injection position partially extending into the molding cavity and an ejection position partially exposed outside the matching profile (t) when the core rod (4) is withdrawn from the molding cavity; during mold closing, the driving profile (s) can push the core rod (4) to slide to the injection position, and during mold opening, the driving profile (s) is separated from the core rod (4), and the core rod (4) returns to the ejection position under the action of the elastic member (5).

2. The mold core-pulling structure according to claim 1, characterized in that: the slide (3) is arranged perpendicular to the mold opening direction, and the driving profile (s) is arranged obliquely relative to the mold opening direction.

3. The mold core-pulling structure according to claim 2, characterized in that: the oblique angle of the driving profile (s) relative to the mold opening direction is between 10° and 20°.

4. The mold core-pulling structure according to claim 1, characterized in that: the ratio of the sliding distance of the core rod (4) between the injection position and the ejection position to the size of the core rod (4) extending into the molding cavity at the injection position is not less than 2.

5. The mold core-pulling structure according to claim 1, characterized in that: a slide plate (6) is fixed on the first mold (1), and the driving profile (s) is located on the slide plate (6).

6. The mold core-pulling structure according to any one of claims 1 to 5, characterized in that: the slide (3) comprises a slide block section (301) and a rod body section (302) connected in sequence along the direction from the matching profile (t) to the molding cavity, and the core rod (4) comprises a driving slide block (401) and a core rod body (402) connected to the driving slide block (401); the driving slide block (401) is slidingly arranged in the slide block section (301), and when the core rod (4) is at the ejection position, the driving slide block (401) is partially exposed outside the matching profile (t) to receive the pushing of the driving profile (s).

7. The mold core-pulling structure according to claim 6, characterized in that: the elastic member (5) comprises a spring arranged in the slide block section (301); the spring is sleeved on the core rod body (402) and acts between the driving slide block (401) and the bottom of the slide block section (301).

8. The mold core-pulling structure according to claim 6, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The driving slider (401) is provided with a limiting slot (4011); a mounting slot (7) in communication with the slider section (301) is formed on the first mold (1) near the matching profile (t), and the mounting slot (7) is provided with a stop block (8) inserted into the limiting slot (4011) to limit the driving slider (401) from being pulled out of the slider section (301).

9. The mold core-pulling structure of claim 6, characterized in that: The core rod body (402) comprises a rod body (4021) slidingly arranged in the rod body section (302), and a head (4022) and an end (4023) respectively located at two ends of the rod body (4021); The bottom of the driving slider (401) is provided with a connecting slot (4012), the head (4022) is inserted into the connecting slot (4012) to connect the core rod body (402) to the driving slider (401); when the core rod (4) is in the injection position, the end (4023) extends into the forming mold cavity.

10. A mold assembly, characterized in that: The mold assembly adopts the mold core-pulling structure of any one of claims 1 to 9.

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