Core-pulling sliding block mechanism for injection mold and injection mold

Abstract

The invention belongs to the technical field of injection molds, and provides a core-pulling sliding block mechanism for an injection mold and the injection mold, the core-pulling sliding block mechanism comprises a first sliding block, a second sliding block and a third sliding block, the first sliding block comprises a first profiling surface and a first limiting surface which are adjacently arranged; the second sliding block comprises a second profiling surface and a second limiting surface which are adjacently arranged, the first profiling surface and the second profiling surface are both used for forming a cavity surface of a formed product, and the first limiting surface and the second limiting surface movably abut against each other; and the forming blocks are movably arranged in the first sliding block, each forming block comprises a profiling convex part, and each forming block is provided with a forming position and an ejection position on the first sliding block. Compared with the prior art, the movable forming block is integrated in the first sliding block, automatic driving and positioning of the forming block are achieved through relative movement of the first sliding block and the second sliding block, and the inner core pulling action can be completed without additionally arranging a hydraulic cylinder or an air cylinder or an independent core pulling mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and particularly relates to a core-pulling slider mechanism for an injection mold and the injection mold. Background Art

[0002] In injection molding, plastic products with side holes, undercuts, or complex internal cavities often require a slider core-pulling mechanism to facilitate smooth mold release. While traditional inclined guide pin core-pulling mechanisms are simple and widely used, they often face challenges when faced with multi-directional core pulling, deep cavity core pulling, or space constraints, such as insufficient core-pulling distance, structural interference, and maintenance difficulties.

[0003] In recent years, with the increasing complexity of product structures, particularly in the automotive and electronics sectors, and the growing demand for precision plastic parts, various complex core-pulling mechanisms based on linked sliders have emerged. Among them, core-pulling mechanisms with dual sliders working together have attracted attention due to their ability to automatically lock during mold closing and automatically pull the core during mold opening. However, existing dual slider mechanisms are primarily designed for external core pulling, making them difficult to meet the molding requirements for complex internal product structures.

[0004] Furthermore, for plastic parts with internal bosses, undercuts, or elongated ribs, conventional integral sliders are difficult to fully demold, necessitating the introduction of movable internal core-pulling elements. These elements typically rely on springs, hydraulic cylinders, or independent ejection systems, resulting in complex structures, low reliability, and large space requirements. In miniaturized molds, in particular, integrating an internal core-pulling mechanism that automatically resets, reliably positions, and possesses sufficient strength within the confined space presents a pressing technical challenge for those skilled in the art.

[0005] For example Figure 1 A workpiece 600 used in an automobile is shown, having an inner wall provided with an undercut structure 610. Conventional injection molds often design the core-pulling mechanism for this undercut structure 610 to be relatively complex, increasing the mold size, reducing mold reliability, and requiring a larger injection molding machine. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a core-pulling slider mechanism for an injection mold and an injection mold in view of the current status of the existing technology.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: to propose a core-pulling slider mechanism for an injection mold, wherein the injection mold includes a cavity block, and the core-pulling slider mechanism includes: A first sliding block is movably disposed on the cavity block, wherein the first sliding block includes a first contouring surface and a first limiting surface that are adjacently disposed; a second slider movably disposed on the cavity block, the second slider comprising a second contour surface and a second limiting surface adjacent to each other, the first contour surface and the second contour surface both being used to form a cavity surface of a molded product, the first limiting surface and the second limiting surface movably abutting against each other to provide a limit for movement of the first slider and the second slider; A plurality of forming blocks are movably arranged in the first slider, each of the forming blocks comprises a contoured protrusion, and each of the forming blocks has a forming position and an ejection position on the first slider; wherein, When in the forming position, the contoured protrusions of the plurality of forming blocks and the inner wall of the first slider are combined to form a forming cavity, one end of the forming cavity passes through the first contoured surface of the first slider, and one end of the forming block provided with the contoured protrusion is pressed against the second limiting surface of the second slider, thereby fixing the forming block in the forming position; When switching from the forming position to the ejecting position, the forming block moves in a direction perpendicular to the moving direction of the first slider, so that the contoured protrusion of the forming block escapes from the first slider, thereby separating the formed workpiece from the contoured protrusion.

[0008] In the above-mentioned core-pulling slider mechanism for an injection mold, a moving channel corresponding to each of the forming blocks is provided in the first slider, the moving channel is arranged obliquely with respect to the moving direction of the first slider, the forming block is movably provided in the moving channel, and an elastic member is provided in the moving channel, one end of the elastic member abuts against the forming block; When the first slider and the second slider move relatively close to each other, the second slider pushes the forming block to move toward the forming position, so that the elastic member is compressed and stores energy; When the first sliding block and the second sliding block move away from each other, the elastic member releases elastic potential energy to push the forming block to move toward the ejection position.

[0009] The above-mentioned core-pulling slider mechanism for an injection mold also includes a slider seat, the first slider is connected to the slider seat, the moving channel passes through one end of the first slider toward the slider seat, a guide column is provided on the slider seat, the guide column extends into the molding block, and the elastic member is sleeved on the outside of the guide column.

[0010] In the above-mentioned core-pulling slider mechanism for an injection mold, a guide block is provided on the first slider, a guide groove is provided on the forming block, and one end of the guide block extends into the guide groove to provide guidance for the movement of the forming block.

[0011] In the above-mentioned core-pulling slider mechanism for an injection mold, a pushing block is provided on the side of the cavity block facing the first slider, and the first slider is provided with a avoidance groove with one end passing through the first limiting surface. One end of the pushing block extends into the avoidance groove and movably abuts against the molding block, and is used to push the molding block to move relative to the first slider when the first slider moves relative to the cavity block.

[0012] In the above-mentioned core-pulling slider mechanism for an injection mold, the outer side wall of the forming block extends toward the cavity block to form a supporting portion, and the supporting portion is movably in contact with the pushing block.

[0013] In the above-mentioned core-pulling slider mechanism for an injection mold, a contoured recess connected to the movable channel is provided in the first slider. When the molding block is in the molding position, the contoured protrusion is inserted into the contoured recess to jointly form the molding cavity. A connecting block is detachably provided on the first slider, and at least a partial side wall of the connecting block constitutes a partial structure of the molding cavity.

[0014] In the above-mentioned core-pulling slider mechanism for an injection mold, a mounting groove is provided on the first slider, one end of the mounting groove is connected to the molding cavity, and the other end passes through the end face of the first slider, the connecting block is provided in the mounting groove, and an exhaust gap is provided between the connecting block and the mounting groove.

[0015] In the above-mentioned core-pulling slider mechanism for an injection mold, a wear-resistant block is provided on the second slider, the end face of the wear-resistant block is flush with the second limiting surface, and is movably abutted against the forming block.

[0016] The present invention solves the above technical problem and further provides an injection mold, comprising the above core-pulling slider mechanism for the injection mold.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) By integrating a movable forming block in the first slider and utilizing the relative movement between the first slider and the second slider to realize automatic driving and positioning of the forming block, the inner core pulling action can be completed without the need for additional configuration of a hydraulic cylinder, an air cylinder or an independent core pulling mechanism.

[0019] (2) An inclined moving channel is provided in the first slider, and an elastic member (such as a spring) is used to realize automatic reset and ejection of the molding block. During the mold closing process, the molding block is pushed into the molding position by the second slider and the elastic member is compressed to store energy. After the mold is opened, the elastic member releases energy and automatically drives the molding block to complete the core pulling action.

[0020] (3) By adding a slider seat and a guide column structure, not only a stable installation base is provided for the first slider, but also the guide column extends into the interior of the forming block and cooperates with the elastic member sleeve, thereby achieving effective guidance and limitation of the elastic member, preventing it from bending, deflecting or becoming unstable during compression and release. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional image of the workpiece.

[0022] Figure 2 A three-dimensional diagram of a core-pulling slider mechanism for an injection mold according to the present invention.

[0023] Figure 3 yes Figure 2 The three-dimensional image after the workpiece is omitted.

[0024] Figure 4 yes Figure 3 Floor plan.

[0025] Figure 5 yes Figure 4 Cross-sectional view along the AA axis.

[0026] Figure 6 It is a three-dimensional diagram of the first slider.

[0027] Figure 7 It is a perspective view of the second slider.

[0028] Figure 8 It is a partial cross-sectional view when the forming block is located at the forming position on the first slider.

[0029] Figure 9 It is a three-dimensional diagram of the forming block.

[0030] In the figure, 100, the first slider; 110, the first contour surface; 120, the first limiting surface; 130, the moving channel; 140, the elastic member; 150, the guide block; 160, the avoidance groove; 170, the contour recess; 180, the connecting block; 190, the mounting groove; 200, the second slider; 210, the second contour surface; 220, the second limiting surface; 230, the wear-resistant block; 300, the forming block; 310, the contour protrusion; 320, the guide groove; 330, the abutting portion; 400, the slider seat; 410, the guide column; 500, the cavity block; 510, the pushing block; 600, the workpiece; 610, the undercut structure. DETAILED DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] like Figures 1 to 9 As shown, a core-pulling slider mechanism for an injection mold of the present invention includes a cavity block 500 , and the core-pulling slider mechanism includes: a first slider 100 , a second slider 200 , and a plurality of molding blocks 300 .

[0034] Specifically, the cavity block 500 is a component of the injection mold, and is mainly used to enclose together with the first slider 100 , the second slider 200 and a plurality of molding blocks 300 to form a complete cavity for molding the workpiece 600 .

[0035] In one embodiment, a guide structure is further provided on the cavity block 500 for providing guidance for the first slider 100 and the second slider 200 when they move relative to the cavity block 500, thereby ensuring smooth movement and accurate positioning of the sliders.

[0036] The first slider 100 and the second slider 200 are both slidably disposed on the cavity block 500 , and their movement is achieved by an oil cylinder or other driving components on the injection mold.

[0037] The first sliding block 100 includes a first contouring surface 110 and a first position-limiting surface 120 that are adjacent to each other, and the second sliding block 200 includes a second contouring surface 210 and a second position-limiting surface 220 that are adjacent to each other.

[0038] During the injection molding process, the first contour surface 110 and the second contour surface 210 together constitute the cavity surface of the molded product, which is used to form the external structure of the workpiece 600; and the first limiting surface 120 and the second limiting surface 220 abut against each other when the mold is closed, playing a limiting and locking role, preventing the slider from shifting during the high-pressure injection molding process, and ensuring the stable closure of the mold.

[0039] The number of forming blocks 300 can be one, two, or more, depending on the number of undercut structures 610 on the workpiece 600. Each forming block 300 is movably disposed within the first slider 100. Each forming block 300 is provided with a contouring protrusion 310. The contouring protrusion 310 and the forming block 300 can be integrally formed or separately provided. After the forming block 300 and the contouring protrusion 310 are separately machined, they are secured together by threaded connection or welding. The forming block 300 has a forming position and an ejection position on the first slider 100.

[0040] In one embodiment, two undercut structures 610 are provided on the workpiece 600. Since the two forming blocks 300 move synchronously, that is, when the mold is closed, the two blocks move synchronously to the forming position (such as Figure 8 After the mold is opened, it is synchronously moved to the ejection position (not shown in the figure). To facilitate the explanation of the working principle of the forming block 300 in this solution, the following description takes a single forming block 300 as an example.

[0041] During operation, when the first slider 100 and the second slider 200 approach each other under the action of a driving device such as a cylinder, and the mold enters a mold closing state, the second slider 200 pushes the forming block 300 through its second limiting surface 220 to move it to the forming position.

[0042] At this point, the contoured protrusion 310 of the molding block 300 cooperates with the contoured recess 170 within the first slider 100 to form a molding cavity for forming the undercut structure 610 of the workpiece 600. One end of this molding cavity communicates with the first contoured surface 110 of the first slider 100, integrally connecting the undercut structure 610 with the main body of the workpiece 600. Simultaneously, the continuous pressure of the second slider 200 stabilizes the molding block 300 in the molding position, ensuring that it does not shift during the injection molding process.

[0043] When the injection molding is completed and the mold begins to open, the cylinder drives the first slider 100 and the second slider 200 to separate from each other. As the second slider 200 withdraws, the constraint on the molding block 300 is released, and the molding block 300 moves from the molding position to the ejection position in a direction perpendicular to the movement direction of the first slider 100.

[0044] For example, refer to Figure 5 The first slide 100 moves from right to left, while the forming block 300 moves from top to bottom relative to the first slide 100. During this process, the contoured protrusion 310 gradually exits the forming cavity, causing the undercut structure 610 of the workpiece 600 to disengage from the contoured protrusion 310, completing the partial core pulling operation.

[0045] After the undercut structure 610 is completely ejected, the ejection mechanism of the injection mold (such as an ejector plate, an ejector pin, etc.) ejects the workpiece 600 from the mold as a whole, completing the entire demoulding process.

[0046] This solution integrates a movable forming block 300 in the first slider 100 and utilizes the relative movement of the first slider 100 and the second slider 200 to realize automatic driving and positioning of the forming block 300, and can complete the internal core pulling action without the need for additional hydraulic cylinders, air cylinders or independent core pulling mechanisms.

[0047] Compared with traditional solutions that rely on inclined ejectors, hydraulic core pulling, or complex linkage mechanisms, this structure is more compact and reliable, and is particularly suitable for the molding of precision plastic parts (such as car kick panels) with complex structures such as internal undercuts, bosses, or slender ribs.

[0048] At the same time, through the mutual abutment between the first limiting surface 120 and the second limiting surface 220, the automatic locking of the double sliders during mold closing is achieved, which improves the overall rigidity and stability of the mold and effectively avoids defects such as flash and overflow caused by insufficient clamping force.

[0049] It is worth mentioning that a moving channel 130 corresponding to the forming block 300 is provided in the first slider 100. The moving channel 130 can be machined. The moving channel 130 is inclined to the moving direction of the first slider 100. The forming block 300 is movably provided in the moving channel 130, and an elastic member 140 is provided in the moving channel 130. One end of the elastic member 140 abuts against the forming block 300. The elastic member 140 is preferably a spring.

[0050] During operation, when the first slider 100 and the second slider 200 move relatively close to each other (i.e., during the mold closing process), the second slider 200 pushes the molding block 300 to move toward the molding position, causing the elastic member 140 to be compressed and store elastic potential energy (refer to Figure 5 ); When the first slider 100 and the second slider 200 move away from each other (i.e., during the mold opening process), the elastic member 140 releases the stored elastic potential energy, pushing the molding block 300 to move toward the ejection position.

[0051] Since the moving channel 130 is tilted relative to the moving direction of the first slider 100, the forming block 300 slides along the moving channel 130 under the drive of the elastic member 140, and its movement direction is decomposed into horizontal and vertical components, and finally the protruding portion 310 on the forming block 300 moves along the moving channel 130. Figure 5 The undercut structure 610 on the workpiece 600 is separated from the top-down direction, thereby completing the core-pulling and demoulding operation of the undercut structure 610.

[0052] In this solution, an inclined movable channel 130 is provided in the first slider 100, and an elastic member 140 (such as a spring) is used to realize automatic resetting and ejection of the forming block 300. During the mold closing process, the forming block 300 is pushed into the forming position by the second slider 200 and the elastic member 140 is compressed to store energy; after the mold is opened, the elastic member 140 releases energy and automatically drives the forming block 300 to complete the core pulling action.

[0053] This design fully utilizes the mechanical movement of mold opening and closing as the driving source, without the need for additional hydraulic cylinders, pneumatic cylinders or other external power systems. It effectively simplifies the mold structure, improves the degree of automation and operational reliability, and is particularly suitable for miniaturized mold applications with limited space.

[0054] In order to facilitate the installation and fixation of the elastic member 140, this solution also includes a slider seat 400, the first slider 100 is connected to the slider seat 400, the movable channel 130 passes through one end of the first slider 100 toward the slider seat 400, and a guide column 410 is provided on the slider seat 400. The guide column 410 extends into the forming block 300, and the elastic member 140 is sleeved on the outside of the guide column 410.

[0055] The connection between the slider base 400 and the first slider 100 can be achieved by a threaded connection. The movable channel 130 runs through one end of the first slider 100 facing the slider base 400, making it convenient to pre-install the elastic member 140 and the forming block 300 in the movable channel 130 before the first slider 100 is installed on the slider base 400.

[0056] The guide post 410 is used to provide guidance to the elastic member 140 when it is compressed and stores energy, ensuring that it is compressed and rebounded along a predetermined axis, preventing deflection or instability, and thus effectively ensuring the service life of the elastic member 140.

[0057] The connection between the guide column 410 and the slider seat 400 can be a threaded connection. Specifically, a threaded hole can be set on the slider seat 400, and an external thread matching the threaded hole can be set at one end of the guide column 410, and the guide column 410 can be screwed in and fixed; of course, a bolt through hole can also be set on the slider seat 400, and an internal threaded hole can be set on the guide column 410. The fixed connection of the guide column 410 is achieved by passing the bolt through the bolt through hole and screwing it into the threaded hole of the guide column 410.

[0058] This solution not only provides a stable installation foundation for the first slider 100 by adding a slider seat 400 and a guide column 410 structure, but also effectively guides and limits the elastic member 140 by extending the guide column 410 into the interior of the forming block 300 and fitting it with the elastic member 140, thereby preventing it from bending, deflecting or becoming unstable during the compression and release process.

[0059] This structure significantly improves the smoothness of movement and repeated positioning accuracy of the forming block 300, prolongs the service life of the elastic member 140, and enhances the durability and reliability of the entire core-pulling mechanism.

[0060] In order to enable the forming block 300 to move along a predetermined path in the first slider 100, a guide block 150 is provided on the first slider 100 in this solution, and a guide groove 320 is provided on the forming block 300. One end of the guide block 150 extends into the guide groove 320 to provide guidance for the movement of the forming block 300.

[0061] The elastic member 140 made of a spring may be deformed or fatigued after long-term operation, causing the thrust of the elastic member 140 on the forming block 300 to deviate from the predetermined direction when releasing the elastic potential energy. In extreme cases, this deviation may cause the forming block 300 to get stuck in the moving channel 130.

[0062] In this solution, a guide block 150 is provided on the first slider 100 and a matching guide groove 320 is provided on the forming block 300 to form a precise guide structure, which effectively limits the movement trajectory of the forming block 300 during its movement to prevent deviation or jamming.

[0063] This guide structure not only ensures the smooth movement of the forming blocks 300 in the predetermined direction, avoiding lateral forces and motion interference, but also significantly improves the reliability of the synchronous movement of multiple forming blocks 300. In particular, when multiple core pulling units are operating in parallel, the consistent movement of each core pulling unit is ensured, improving the stability and quality consistency of product molding.

[0064] In order to further ensure that the forming block 300 will not get stuck in the moving channel 130, in this solution, a pushing block 510 is provided on the side of the cavity block 500 facing the first slider 100, and the first slider 100 is provided with a avoidance groove 160 with one end passing through the first limiting surface 120. One end of the pushing block 510 extends into the avoidance groove 160 and is movably abutted against the forming block 300, and is used to push the forming block 300 to move relative to the first slider 100 when the first slider 100 moves relative to the cavity block 500.

[0065] During the injection mold opening process, the first slider 100 moves relative to the cavity block 500, driving the avoidance groove 160 thereon to slide along the push block 510 fixed to the cavity block 500. As the two move relative to each other, the distance between the push block 510 and the molding block 300 within the first slider 100 gradually decreases. After the push block 510 contacts the molding block 300, the first slider 100 continues to move, pushing the molding block 300 from the molding position to the ejection position relative to the first slider 100.

[0066] This structure can ensure that the forming block 300 can reliably complete the core pulling action and achieve smooth demoulding from the workpiece 600 even when the elastic member 140 fails or the pre-tightening force is insufficient.

[0067] This solution utilizes a push block 510 on the cavity block 500 and a matching avoidance groove 160 within the first slider 100 to actively drive and control the position of the forming block 300 through relative motion during mold opening. This design improves the controllability of the forming block 300's movement and ensures its separation from the first slider 100 during mold opening.

[0068] Furthermore, the outer wall of the forming block 300 extends toward the cavity block 500 to form a supporting portion 330 , and the supporting portion 330 is movably in contact with the pushing block 510 .

[0069] The abutting portion 330 may be integrally formed with the forming block 300 , or may be fixed by welding or threaded connection.

[0070] In this solution, by providing abutment portions 330 on the outer wall of forming block 300, extending toward cavity block 500, the contact area between forming block 300 and push block 510 is increased, ensuring more uniform and reliable transmission of the pushing force. This structure effectively reduces the risk of localized stress concentration and prevents deformation or fracture of forming block 300 during frequent reciprocating motion, thereby improving the structural strength and long-term reliability of the mechanism.

[0071] It is worth mentioning that a contoured recess 170 connected to the movable channel 130 is provided in the first slider 100. When the forming block 300 is in the forming position, the contoured protrusion 310 is inserted into the contoured recess 170 to form a forming cavity together. A connecting block 180 is detachably provided on the first slider 100, and at least a partial side wall of the connecting block 180 constitutes a partial structure of the forming cavity.

[0072] When the undercut structure 610 on the workpiece 600 includes small or complex features, directly machining the corresponding structure on the inner wall of the molding cavity will significantly increase the machining difficulty and manufacturing cost of the injection mold.

[0073] To solve this problem, the present solution detachably provides a connecting block 180 on the first slider 100 , and processes a portion of the contour of the undercut structure 610 on the connecting block 180 , thereby reducing the overall processing complexity of the molding cavity.

[0074] The detachable connection between the connecting block 180 and the first sliding block 100 can be achieved by inlaying or threading.

[0075] The contoured concave portion 170 is provided in the first slider 100 and cooperates with the contoured convex portion 310 of the forming block 300 to form a complete forming cavity, which helps to improve the forming accuracy and surface quality of the inner cavity.

[0076] The detachable design of the connecting block 180 not only facilitates local repair or replacement of vulnerable parts, but also supports rapid mold changes to adapt to different product models, significantly improving the flexibility, maintenance convenience and economy of the mold.

[0077] Furthermore, a mounting groove 190 is provided on the first slider 100, one end of the mounting groove 190 is connected to the molding cavity, and the other end passes through the end face of the first slider 100, the connecting block 180 is provided in the mounting groove 190, and an exhaust gap is provided between the connecting block 180 and the mounting groove 190.

[0078] The molding cavity is used to form the undercut structure 610 on the workpiece 600. Due to the thin wall thickness of the workpiece 600, the effective width of the molding cavity is relatively small when the molding block 300 is in the mold closing position. If the molding cavity is designed as a closed structure, the gas inside the cavity will be difficult to escape during the injection molding process, which can easily cause trapped gas and lead to defects such as material shortages and burning.

[0079] To address this issue, the present application provides a mounting groove 190 on the first slider 100. One end of the mounting groove 190 communicates with the molding cavity, and the other end extends through the end face of the first slider 100. A connecting block 180 is detachably mounted within the mounting groove 190. A venting gap is provided between the connecting block 180 and the mounting groove 190 to effectively exhaust air and volatile gases from the molding cavity during the injection molding process, preventing air lock defects and thereby ensuring filling integrity and workpiece 600 quality.

[0080] Preferably, a wear-resistant block 230 is provided on the second sliding block 200 , and the end surface of the wear-resistant block 230 is flush with the second limiting surface 220 and is movably in contact with the forming block 300 .

[0081] A wear-resistant block 230 is installed on the second slider 200. Its end face is flush with the second limiting surface 220 and movably abuts against the forming block 300. This significantly reduces wear caused by high-frequency relative motion and extends the service life of critical contact surfaces. The wear-resistant block 230 is made of a high-hardness material (such as alloy steel or surface-treated components) and is individually replaceable, reducing overall maintenance costs and improving the mold's economic efficiency and sustainability.

[0082] This solution also proposes an injection mold, which includes the above-mentioned core-pulling slider mechanism.

[0083] In summary, this solution provides a core-pulling slider mechanism for an injection mold that has a compact structure, reliable operation, and convenient maintenance.

[0084] This mechanism integrates a movable forming block 300 within the first slider 100, and combines dual slider linkage, an inclined movement channel 130, an elastic reset element, and a guide structure to achieve automatic core extraction and reset of the complex internal undercut structure 610. The design of the push block 510, abutment portion 330, connecting block 180, and exhaust gap further enhances motion reliability, processing economy, and forming quality.

[0085] In addition, the entire mechanism does not require additional hydraulic or pneumatic drive, and fully utilizes the mechanical movement of mold opening and closing to achieve automatic control, effectively solving the problems of traditional core-pulling mechanisms such as complex structure, large space occupation, easy jamming, and difficult maintenance. It is particularly suitable for the efficient and stable production of plastic parts with thin walls, complex structures, and high precision requirements (such as automobile kick panels), and has good practical value and broad application prospects.

[0086] It should be noted that, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integral whole; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0087] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0088] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A core-pulling slider mechanism for an injection mold, wherein the injection mold includes a cavity block, characterized in that: The core-pulling slider mechanism includes: A first sliding block is movably disposed on the cavity block, wherein the first sliding block includes a first contouring surface and a first limiting surface that are adjacently disposed; a second slider movably disposed on the cavity block, the second slider comprising a second contour surface and a second limiting surface adjacent to each other, the first contour surface and the second contour surface both being used to form a cavity surface of a molded product, the first limiting surface and the second limiting surface movably abutting against each other to provide a limit for movement of the first slider and the second slider; A plurality of forming blocks are movably arranged in the first slider, each of the forming blocks comprises a contoured protrusion, and each of the forming blocks has a forming position and an ejection position on the first slider; wherein, When in the forming position, the contoured protrusions of the plurality of forming blocks and the inner wall of the first slider are combined to form a forming cavity, one end of the forming cavity passes through the first contoured surface of the first slider, and one end of the forming block provided with the contoured protrusion is pressed against the second limiting surface of the second slider, thereby fixing the forming block in the forming position; When switching from the forming position to the ejecting position, the forming block moves in a direction perpendicular to the moving direction of the first slider, so that the contoured protrusion of the forming block escapes from the first slider, thereby separating the formed workpiece from the contoured protrusion.

2. A core-pulling slider mechanism for an injection mold according to claim 1, characterized in that: A moving channel corresponding to each of the forming blocks is provided in the first slider, the moving channel is arranged obliquely to the moving direction of the first slider, the forming block is movably provided in the moving channel, and an elastic member is provided in the moving channel, one end of the elastic member abuts against the forming block; When the first slider and the second slider move relatively close to each other, the second slider pushes the forming block to move toward the forming position, so that the elastic member is compressed and stores energy; When the first sliding block and the second sliding block move away from each other, the elastic member releases elastic potential energy to push the forming block to move toward the ejection position.

3. A core-pulling slider mechanism for an injection mold according to claim 2, characterized in that: It also includes a slider seat, the first slider is connected to the slider seat, the moving channel passes through one end of the first slider toward the slider seat, a guide column is provided on the slider seat, the guide column extends into the forming block, and the elastic member is sleeved on the outside of the guide column.

4. A core-pulling slider mechanism for an injection mold according to claim 3, characterized in that: The first sliding block is provided with a guide block, the forming block is provided with a guide groove, and one end of the guide block extends into the guide groove to provide guidance for the movement of the forming block.

5. The core-pulling slider mechanism for an injection mold according to claim 1, wherein: A pushing block is provided on the side of the cavity block facing the first slider, and the first slider is provided with an avoidance groove with one end passing through the first limiting surface. One end of the pushing block extends into the avoidance groove and movably abuts against the molding block, and is used for pushing the molding block to move relative to the first slider when the first slider moves relative to the cavity block.

6. A core-pulling slider mechanism for an injection mold according to claim 5, characterized in that: The outer side wall of the forming block extends toward the cavity block to form a supporting portion, and the supporting portion is movably in contact with the pushing block.

7. A core-pulling slider mechanism for an injection mold according to claim 2, characterized in that: A contoured recess connected to the moving channel is provided in the first slider. When the forming block is in the forming position, the contoured protrusion is inserted into the contoured recess to form the forming cavity. A connecting block is detachably provided on the first slider. At least a partial side wall of the connecting block constitutes a partial structure of the forming cavity.

8. A core-pulling slider mechanism for an injection mold according to claim 7, characterized in that: The first slider is provided with a mounting groove, one end of the mounting groove is communicated with the molding cavity, and the other end passes through the end surface of the first slider, the connecting block is arranged in the mounting groove, and an exhaust gap is provided between the connecting block and the mounting groove.

9. The core-pulling slider mechanism for an injection mold according to claim 1, wherein: The second sliding block is provided with a wear-resistant block, the end surface of the wear-resistant block is flush with the second limiting surface and is movably abutted against the forming block.

10. An injection mold, characterized in that: It comprises a core-pulling slider mechanism for an injection mold as described in any one of claims 1 to 9.

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