A plastic product with an inverted core-pulling structure

Abstract

This application relates to an undercut core-pulling structure for plastic products, comprising: a slider, a spring pin, and a spring. The spring pin passes through the slider and extends into the cavity of a mold. The spring pin is sleeved on the spring pin, with one end of the spring contacting the spring pin and the other end contacting the slider. The spring pushes the spring pin away from the cavity. The method provided in this application, by using a spring to provide a force pushing the spring pin away from the mold cavity, thereby pushing the spring pin to pull it out, reduces the need for a power mechanism at the spring pin, effectively reducing the complexity of the overall structure, and achieving the goals of reducing production and maintenance costs and improving disassembly and assembly efficiency.

Description

Technical Field

[0001] This application relates to the field of injection mold manufacturing and processing technology, and in particular to an undercut core-pulling structure for plastic products. Background Technology

[0002] In existing technologies, injection molds generally require two sets of core-pulling structures: a front mold hydraulic cylinder and a slider, to perform the core-pulling operation. Specifically, the hydraulic cylinder is connected to the slider for transmission, and the small slider is connected to the front mold's inclined ejector. After the injection molding process is completed, when the rear mold opens from the front mold, the rear mold retracts, and the front mold's inclined ejector drives the small slider to move, causing it to exit the molded product. Then, the hydraulic cylinder is activated, driving the slider to exit the cavity, thus achieving smooth demolding.

[0003] The aforementioned structure results in a large overall mold size, requiring significant installation space. Furthermore, the complex internal structure and numerous components make assembly and disassembly cumbersome, leading to higher overall manufacturing and maintenance costs. Additionally, the angled ejector pins of the front mold are prone to misalignment during alignment, potentially causing breakage. Such a breakage could lead to the failure of the entire mechanism, disrupting the injection molding process. Utility Model Content

[0004] This application provides an undercut core-pulling structure for plastic products to solve the existing technical problems that the overall structure of the undercut core-pulling structure in the injection molding mold is relatively complex, resulting in a large mold size, which affects the disassembly and assembly efficiency and production and maintenance costs.

[0005] This application provides an undercut core-pulling structure for plastic products, including: a slider, a spring pin, and a spring. The spring pin passes through the slider and extends into the cavity of the mold. The spring pin is sleeved on the spring pin. One end of the spring pin contacts the spring pin, and the other end contacts the slider. The spring pin pushes the spring pin away from the cavity.

[0006] Furthermore, a pressure block is provided on the slider, and the end of the spring needle away from the cavity passes through the pressure block.

[0007] Furthermore, a limiting platform is provided on the spring pin, the end of the spring contacts one side of the limiting platform, and the other side of the limiting platform is in movable contact with the pressure block.

[0008] Furthermore, the pressure block and the slider are respectively provided with connecting holes, and the connecting holes are fixedly connected by connectors.

[0009] Furthermore, the connector is a pin, with both ends of the pin inserted into the connecting holes on the pressure block and the slider, respectively.

[0010] Furthermore, the connecting hole on the pressure block is a stepped hole, the connecting hole on the slider is a threaded hole, and the connecting member is a bolt. The bolt passes through the stepped hole and is locked in the threaded hole to fix the pressure block and the slider together.

[0011] Furthermore, the slider is connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to the slider and drives the slider to reciprocate.

[0012] Furthermore, the spring is a high-temperature resistant spring.

[0013] The technical solutions provided in this application have the following advantages compared with the prior art:

[0014] The method provided in this application embodiment uses a spring to provide a force that pushes the spring pin away from the mold cavity, thereby pushing the spring pin to be pulled out. This reduces the power mechanism required at the spring pin, effectively reduces the complexity of the overall structure, and achieves the goal of reducing production and maintenance costs and improving disassembly and assembly efficiency. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of an undercut core-pulling structure for a plastic product, provided as an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the assembly structure of the spring and the pin.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Slider; 11. Hydraulic cylinder; 2. Spring pin; 21. Limiting platform; 3. Spring; 4. Pressure block; 5. Connecting hole; 51. Connecting piece. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0024] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0025] To address the existing technical problem that the complex overall structure of the undercut core-pulling structure in injection molding molds results in large mold dimensions, affecting disassembly and assembly efficiency and production and maintenance costs, this application provides an undercut core-pulling structure for plastic products. This structure utilizes a spring to provide a force that pushes the spring pin away from the mold cavity, thereby driving the spring pin to be pulled out. This reduces the need for a power mechanism at the spring pin location, effectively reducing the complexity of the overall structure and achieving the goals of lowering production and maintenance costs while improving disassembly and assembly efficiency.

[0026] Please see Figure 1 , Figure 2This application provides a plastic product undercut core-pulling structure, including: a slider 1, a spring pin 2 and a spring 3. The spring pin 2 passes through the slider 1 and extends into the cavity of the mold. The spring 3 is sleeved on the spring pin 2. One end of the spring 3 contacts the spring pin 2 and the other end contacts the slider 1. The spring 3 pushes the spring pin 2 away from the cavity.

[0027] When the front and rear molds are in the closed state, the clamping action of the front mold causes the spring pin 2 to be pressed downwards, extending it into the mold cavity to facilitate the injection molding of the undercut structure on the product. At this time, the spring 3 is compressed, accumulating elastic potential energy. After injection molding, the front and rear molds open. During mold opening, the force applied to the spring pin 2 by the front mold is removed, consequently removing the force applied to the spring 3. The spring 3 then returns to its original position under its elastic action, pushing the spring pin 2 away from the cavity, causing its end to be pulled away from the undercut structure of the product within the cavity. Then, the slider 1 moves away from the product, thus achieving demolding of the undercut structure.

[0028] Compared to existing core-pulling structures, the embodiments provided in this application employ a spring 3 driving a spring pin 2 for core pulling. This reduces the need for a separate driving structure, effectively decreasing the overall structural complexity, facilitating mold assembly and disassembly, and reducing the overall mold size. This allows the mold to be used on smaller injection molding machines. Furthermore, the reduced structural requirements result in lower overall mold production and maintenance costs compared to existing technologies, enabling cost control. Additionally, unlike existing technologies that use a slanted ejector for core pulling, this embodiment utilizes the elasticity of the spring 3 to push the spring pin 2, ensuring effective removal of the spring pin 2 and maintaining a stable and reliable trajectory during the core-pulling process. This prevents misalignment of the slanted ejector, which could damage the mold or product, effectively improving the safety and stability of the injection molding and mold opening processes.

[0029] In some optional embodiments, a pressure block 4 is provided on the slider 1, and the end of the spring pin 2 away from the cavity passes through the pressure block 4. By providing the pressure block 4 on the slider 1 and allowing the spring pin 2 to pass through the pressure block 4, the pressure block 4 provides guidance and limiting for the spring pin 2 during mold closing, when pushed by the front mold, and during mold opening, when pushed by the spring 3. This ensures the stability of the spring pin 2's movement path. The pressure block 4 provides guidance and limiting for the spring pin 2, avoiding misalignment issues that easily occur when using angled ejectors for core pulling in the prior art. This effectively prevents damage to the product or mold due to misalignment, ensuring the overall safety and reliability of the mold.

[0030] In some optional embodiments, the spring pin 2 is provided with a limiting platform 21, the end of the spring 3 contacts one side of the limiting platform 21, and the other side of the limiting platform 21 is in movable contact with the pressure block 4. By providing the limiting platform 21, when the spring 3 returns to its original state under elastic action, it can apply a pushing force to the limiting platform 21 of the spring pin 2, thereby pushing the spring pin 2 to move and disengage from the undercut structure of the formed product, realizing the core-pulling action. At the same time, when the spring 3 pushes out the spring pin 2, when the spring pin 2 moves to its limit position, the limiting platform 21 on the spring pin 2 will contact the pressure block 4, thereby providing a limit for the spring pin 2 through the pressure block 4, thus preventing the spring pin 2 from being excessively pulled out and causing the stroke position to deviate, ensuring the stability of the movement path of the spring pin 2, and thus ensuring the product yield.

[0031] In some optional embodiments, the pressure block 4 and the slider 1 are respectively provided with corresponding connecting holes 5, and the connecting holes 5 are fixedly connected by connectors 51. By fixing the corresponding connecting holes 5 on the pressure block 4 and the slider 1 with connectors 51, the requirement of assembling the pressure block 4 and the slider 1 is met, so that the spring pin 2 can only move within the area between the pressure block 4 and the slider 1, thereby limiting the movement range of the spring pin 2.

[0032] In some optional embodiments, the connector 51 is a pin, with both ends of the pin inserted into the connecting holes 5 on the pressure block 4 and the slider 1, respectively. By inserting the pin into the corresponding connecting holes 5 on the pressure block 4 and the slider 1, a limiting position is provided between the pressure block 4 and the slider 1, thereby achieving the effect of assembly and fixation. In some embodiments, the pin and the connecting hole 5 adopt an interference fit tolerance, which can effectively limit the relative movement between the pressure block 4 and the slider 1, ensuring the effect of assembly and fixation.

[0033] In some optional embodiments, the connecting hole 5 on the pressure block 4 is a stepped hole, and the connecting hole 5 on the slider 1 is a threaded hole. The connecting member 51 is a bolt, which passes through the stepped hole and is locked in the threaded hole to fix the pressure block 4 and the slider 1. By locking the bolt in the threaded hole, the pressure block 4 and the slider 1 are effectively assembled and fixed, thereby limiting the movement range of the spring needle 2 and preventing excessive movement of the spring needle 2 and misalignment.

[0034] In some optional embodiments, the slider 1 is connected to a hydraulic cylinder 11, the output end of which is connected to the slider 1 and drives the slider 1 to reciprocate. After the front and rear molds open, and the spring pin 2 is lifted by the spring 3, causing it to disengage from the undercut structure on the product, the slider 1 can be driven by the hydraulic cylinder 11 to move away from the mold cavity, thus completing the demolding of the product.

[0035] In some optional embodiments, the spring 3 is a high-temperature resistant spring 3. During the injection molding process, the temperature inside the injection molding machine is high, and prolonged exposure to this high-temperature environment affects the atomic structure of the spring 3 material, causing a change in the elastic modulus of the spring 3, thus affecting its elastic performance. Therefore, in this application, a high-temperature resistant spring 3 is used to reduce the impact of high temperature on the performance of the spring 3, ensuring that the spring 3 can stably provide thrust to the spring needle 2, meeting the core-pulling movement requirements of the spring needle 2.

[0036] The method provided in this application embodiment uses a spring 3 to provide a force that pushes the spring pin 2 away from the mold cavity, thereby pushing the spring pin 2 to be pulled out. This reduces the power mechanism required at the spring pin 2, effectively reduces the complexity of the overall structure, and achieves the goal of reducing production and maintenance costs and improving disassembly and assembly efficiency.

[0037] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0043] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0044] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A snap-in core-pulling structure for plastic products, characterized in that, include: The mold consists of a slider, a spring pin, and a spring. The spring pin passes through the slider and extends into the cavity of the mold. The spring pin is sleeved on the spring pin, with one end of the spring pin in contact with the spring pin and the other end in contact with the slider. The spring pin pushes the spring pin away from the cavity.

2. The inverted core-pulling structure for plastic products according to claim 1, characterized in that, The slider is provided with a pressure block, and the end of the spring needle away from the cavity passes through the pressure block.

3. The inverted core-pulling structure for plastic products according to claim 2, characterized in that, The spring pin is provided with a limiting platform, the end of the spring is in contact with one side of the limiting platform, and the other side of the limiting platform is in contact with the pressure block.

4. The inverted core-pulling structure for plastic products according to claim 2, characterized in that, The pressure block and the slider are respectively provided with connection holes, and the connection holes are fixedly connected by connectors.

5. The inverted core-pulling structure for plastic products according to claim 4, characterized in that, The connector is a pin, with both ends of the pin inserted into the connecting holes on the pressure block and the slider, respectively.

6. The inverted core-pulling structure for plastic products according to claim 4, characterized in that, The connecting hole on the pressure block is a stepped hole, and the connecting hole on the slider is a threaded hole. The connecting component is a bolt, which passes through the stepped hole and is locked in the threaded hole to fix the pressure block and the slider together.

7. The inverted core-pulling structure for plastic products according to claim 1, characterized in that, The slider is connected to a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to the slider and drives the slider to reciprocate.

8. The inverted core-pulling structure for plastic products according to claim 1, characterized in that, The spring is a high-temperature resistant spring.

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