A reinforced anti-shrinkage structure

Abstract

This utility model provides a reinforcing rib anti-shrinkage structure, including a skeleton with inclined walls forming a accommodating space. At least one reinforcing rib is provided on the inner wall of the inclined walls facing the accommodating space. The reinforcing rib and the inclined walls are integrally injection molded. A connecting surface is provided at the connection between the reinforcing rib and the inclined walls. The wall thickness of the inclined walls is C, and the width B of the connecting surface is less than 0.5 times the wall thickness C. Designing the reinforcing rib to extend vertically along the mold opening direction effectively avoids the shrinkage problem caused by the wall extension of traditional vertical reinforcing ribs, significantly reducing mold complexity and manufacturing costs. By providing a shrinkage surface, material accumulation in the connecting area is greatly reduced, thereby significantly reducing the shrinkage difference in this area during cooling, suppressing shrinkage and depressions, and ensuring product appearance quality and structural consistency. The secondary ribs further enhance the bending and breaking resistance of the overall structure, improving the durability and reliability of the parts.

Description

Technical Field

[0001] This utility model belongs to the field of reinforcing rib technology, specifically relating to a reinforcing rib anti-shrinkage structure. Background Technology

[0002] In the field of plastic injection molding, reinforcing ribs are a common means of improving structural rigidity and resistance to deformation, especially suitable for thin-walled or inclined wall structures. In existing technologies, to enhance the mechanical properties of inclined components, reinforcing ribs perpendicular to the wall surface are typically placed on the inclined wall. However, this design has significant shortcomings in actual mold structures and injection molding processes. First, reinforcing ribs perpendicular to the inclined wall often result in undercut structures in the mold, making conventional top and bottom mold opening methods difficult to implement. Second, due to the significant thickness difference at the connection between the reinforcing rib and the wall surface, this area shrinks much more during injection molding and cooling than the surrounding wall surface, easily causing surface shrinkage, depressions, and other appearance defects, affecting the product's aesthetics and structural integrity. Although shrinkage can be mitigated by reducing the rib thickness, this weakens the reinforcing effect, making it difficult to balance structural performance and molding quality. Therefore, existing technologies lack a reinforcing rib design scheme that can effectively enhance inclined structures while avoiding mold opening difficulties and shrinkage defects. Utility Model Content

[0003] (1) Technical problems to be solved This utility model provides a reinforcing rib anti-shrinkage structure, which aims to solve the shrinkage problem of inclined reinforcing ribs.

[0004] (2) Technical solution This utility model provides a reinforcing rib anti-shrinkage structure, including a skeleton, the skeleton having an inclined wall, the inclined wall surrounding to form an accommodating space, at least one reinforcing rib on the inner wall of the inclined wall facing the accommodating space, the reinforcing rib being integrally injection molded with the inclined wall, a connecting surface being provided at the connection between the reinforcing rib and the inclined wall, the wall thickness of the inclined wall being C, and the width B of the connecting surface being less than 0.5 times the wall thickness C.

[0005] Furthermore, the reinforcing rib has a first rib surface and a second rib surface, which are parallel to each other and both extend vertically.

[0006] Furthermore, the first and second rib surfaces are arranged to converge with the inclined wall at their connection points.

[0007] Furthermore, the second rib extends vertically and connects to the inclined wall, and the bottom of the first rib is bent to form a contraction surface that connects to the inclined wall.

[0008] Furthermore, the first rib surface is connected to the inclined wall, and the bottom of the second rib surface is bent and connected to the inclined wall.

[0009] Furthermore, the reinforcing rib thickness A is provided between the first rib surface and the second rib surface, the width B of the connecting surface is less than or equal to the rib thickness A, and the rib thickness A is less than the wall thickness C of the inclined wall.

[0010] Furthermore, the accommodating space is provided with an axis L, and the reinforcing rib extends circumferentially around the axis L.

[0011] Furthermore, a secondary rib is provided between the reinforcing rib and the inclined wall, and the secondary rib, the reinforcing rib, and the inclined wall are integrally injection molded together.

[0012] Furthermore, the secondary reinforcing bar is arranged intersecting with the circumferentially extending reinforcing bar.

[0013] Furthermore, the number of reinforcing ribs is multiple, and they are arranged symmetrically.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: By optimizing the connection between the reinforcing ribs and the inclined walls, and designing the reinforcing ribs to extend vertically along the mold opening direction, the shrinkage problem caused by excessive wall thickness in traditional vertical reinforcing ribs is effectively avoided. This allows the mold to adopt a simple top and bottom mold opening method, significantly reducing mold complexity and manufacturing costs. By setting a shrinkage surface, the material accumulation in the connection area is greatly reduced, thereby significantly reducing the shrinkage difference in this area during the cooling process, suppressing shrinkage and depressions, and ensuring the consistency of product appearance quality and structure. The setting of secondary ribs further enhances the bending and breaking resistance of the overall structure, improving the durability and reliability of the parts without increasing the wall thickness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a front sectional view of the present invention.

[0017] Figure 3 This is one embodiment of the present invention.

[0018] Figure 4 This is Embodiment 2 of the present invention.

[0019] Figure 5 This is a plastic shrinkage diagram of Embodiment 2 of this utility model.

[0020] Figure 6 This is a cross-sectional view of the contraction surface of this utility model.

[0021] Figure 7 This is a schematic diagram of the contraction surface structure of this utility model.

[0022] Figure 8 For the present utility model Figure 6 Shrinkage chart.

[0023] Figure 9 This is Embodiment Four of the present invention.

[0024] Figure 10 This is the fifth embodiment of the present invention.

[0025] Figure 11 This is a top view of the present invention.

[0026] Reference numerals: 1-Skeleton, 2-Accommodation space, 3-Inclined wall, 4-Strengthening rib, 41-First rib surface, 42-Second rib surface, 43-Secondary rib, 5-Connecting surface, 6-Contraction surface. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] like Figure 1-2 As shown, this utility model provides a reinforcing rib anti-shrinkage structure, including a skeleton 1. The skeleton 1 is provided with an inclined wall 3, which surrounds the skeleton 1 to form a side wall and also forms a funnel-shaped accommodating space 2. In the accommodating space 2, a reinforcing rib 4 is provided on the inner wall of the inclined wall 3 facing the accommodating space 2. The reinforcing rib 4 and the inclined wall 3 are integrally injection molded to ensure the integrity and mechanical strength of the structure. At the same time, an axis L is provided in the accommodating space 2, and the reinforcing rib 4 extends circumferentially around the axis L.

[0029] In mold manufacturing, the reinforcing rib 4 on the inclined surface can enhance the overall rigidity and deformation resistance of the structure. The inclined wall 3 is prone to deformation when subjected to external force. The reinforcing rib 4 can effectively transfer and disperse stress, improve the bending resistance and deformation stability of the inclined wall 3, and make the parts more robust and durable. In addition, the circumferentially extended reinforcing rib 4 of this application can achieve circumferential uniform distribution of stress, avoid structural weakening or damage caused by local stress concentration, and further optimize the mechanical properties and reliability of the overall structure. In traditional practices, such as Figure 3 As shown, the reinforcing rib 4 provided on the inclined wall 3 is usually perpendicular to the inclined wall 3. However, since this patent adopts a mold design with upper and lower mold opening, that is, the upper mold is set above the inclined wall 3 and the lower mold is set below the inclined wall 3, the design of the reinforcing rib 4 being perpendicular to the inclined wall 3 will cause an undercut to form below the reinforcing rib 4. This undercut will seriously hinder the normal mold opening action, resulting in difficulty in demolding, or even the inability to achieve smooth upper and lower mold opening, thus placing higher demands on the mold structure and production process. To address this issue, this invention optimizes the arrangement direction of the reinforcing rib 4, setting its extension direction to be consistent with the mold opening direction, i.e., as shown below. Figure 4 As shown, the reinforcing rib 4 has a first rib surface 41 and a second rib surface 42 that are parallel to each other. The first rib surface 41 and the second rib surface 42 extend vertically from the inclined wall 3. This structural design ensures that the reinforcing rib 4 on the inclined wall 3 will not form an undercut in the vertical direction, thus making it fully compatible with the upper and lower mold opening method. The combination of the first rib surface 41 and the second rib surface 42 that are parallel to each other makes the upper and lower mold opening smoother and free from interference, significantly improving the demolding reliability and production efficiency.

[0030] Such a setup can easily lead to shrinkage defects during injection molding. It is important to understand that during injection molding, the molten plastic is usually at a high temperature. After being injected into the mold, the liquid plastic gradually cools into a solid state. During the cooling process, the material shrinks in volume due to its thermal shrinkage properties. At this time, a gap will be created between the plastic and the mold. It is then necessary to continue injecting liquid plastic into the mold to fill the gap. This process is called "holding pressure" to ensure that the plastic fills the mold before it cools into a solid state, ultimately forming a solid plastic. The main reason for shrinkage is usually because there are areas of varying thickness. Areas of different thicknesses require different volumes to shrink, and these different volumes result in different amounts of shrinkage. Figure 4 As shown, the thickness of the connection area between the inclined wall 3 and the reinforcing rib 4 is significantly greater than the wall thickness C of the rest of the inclined wall 3, forming a sudden change in material thickness. During the plastic cooling process, the connecting area is thicker, cools more slowly, and has a correspondingly larger shrinkage, while the wall thickness C of the inclined wall 3 is thinner, resulting in faster cooling and relatively smaller shrinkage. This uneven shrinkage behavior makes the connecting area more prone to inward concavity after demolding compared to the surrounding inclined walls 3, forming a... Figure 5 The surface shrinkage marks shown are what are commonly referred to as "shrinkage" defects.

[0031] To address the shrinkage issue, the volume of the connecting area needs to be reduced, thereby decreasing the shrinkage of the connecting area and bringing it closer to the shrinkage level of the remaining inclined walls 3. The most direct method is to reduce the thickness of the reinforcing rib 4, specifically reducing the rib thickness A. Rib thickness A is the vertical distance between the first rib surface 41 and the second rib surface 42. The smaller the rib thickness A, the smaller the area formed by the connection between the reinforcing rib 4 and the inclined wall 3. However, the rib thickness A should not be reduced excessively, otherwise it will weaken the stiffness and strength of the reinforcing rib 4 itself, making it difficult to provide effective support and reinforcement for the inclined wall 3, ultimately affecting the structural performance and service life of the part. Specifically, in one embodiment of this utility model, such as Figure 6-7 As shown, in order to ensure that the reinforcing rib 4 has a sufficient rib thickness A to provide structural reinforcement, and to effectively solve the shrinkage problem, this application connects the second rib surface 42 to the inclined wall 3 while keeping the second rib surface 42 vertically connected to the inclined wall 3, and the first rib surface 41 bends towards the second rib surface to form a contraction surface 6 when it extends downwards and approaches the inclined wall 3, so that the parts of the first rib surface 41 and the second rib surface 42 that are close to the inclined wall 3 converge with each other and connect to the inclined wall 3. Among them, such as Figure 6-8 As shown, the connection between the reinforcing rib 4 and the inclined wall 3 is provided with a connecting surface 5. The connecting surface 5 has a width B, which is the connection width between the reinforcing rib 4 and the inclined wall 3. Through a mutually converging arrangement, it connects with... Figure 4 contrast, Figure 6 The width B of the connecting surface 5 is significantly smaller than Figure 4 The width of the connecting surface 5, that is... Figure 6 The volume of the connection area between the reinforcing rib 4 and the inclined wall 3 is smaller than that of the above. Figure 4 The volume of the connection area between the reinforcing rib 4 and the inclined wall 3, as described above, results in Figure 6 The shrinkage of the connecting region should be less than Figure 4 The shrinkage of the connecting area is closer to the shrinkage of the surrounding inclined wall 3, thereby significantly reducing the risk of surface shrinkage due to uneven shrinkage. Preferably, such as Figure 6 As shown, after multiple adjustments and tests, it was found that when the width B of the connecting surface 5 is less than 0.5 times the wall thickness C of the inclined wall 3, shrinkage defects are less likely to occur. It is worth noting that, such as Figure 4 As shown, the first rib surface 41 is not bent to form the contraction surface 6, and at this time, the width B of the connecting surface 5 is greater than the rib thickness A of the reinforcing rib 4; while Figure 6 In this process, the bottom of the first rib surface 41 is bent to form the shrinkage surface 6. At this time, the width B of the connecting surface 5 does not move to be less than the rib thickness A of the reinforcing rib 4, or it can be equal to the rib thickness A of the reinforcing rib 4. As long as the width B of the connecting surface 5 is less than 0.5 times the wall thickness C of the inclined wall 3, the effect of not easily shrinking can be achieved.

[0032] And in Figure 6 In the middle, the first rib surface 41 is bent to form a small undercut. In order to open the mold smoothly, an internal sliding mechanism or a sloping ejector structure can be set in the mold to perform the demolding action for the undercut. Although Figure 3 The traditional reinforcing rib 4 can also be ejected from the mold using a slanted ejector, but... Figure 3The undercut is relatively large, and the demolding stroke is long, requiring significant modifications to the mold and mold core. This not only increases structural complexity but also significantly raises manufacturing and maintenance costs. In comparison, Figure 6 The proposed design features a smaller undercut, requires a shorter demolding stroke, and involves fewer modifications to the mold structure, significantly reducing overall manufacturing difficulty and cost. Therefore, considering mold feasibility, manufacturing cost, and production stability, this design is a viable option. Figure 6 The proposed solution has greater advantages in implementation.

[0033] In another embodiment, such as Figure 9 As shown, the first rib surface 41 is kept vertically connected to the inclined wall 3, while the second rib surface 42 extends downwards and bends as it approaches the inclined wall 3. This also allows the width B to be less than 0.5 times the wall thickness C. Correspondingly, the second rib surface 42 will also form an inverted shape. However, Figure 9 Because the resulting undercut is located in a relatively narrow area, a slanted ejector mechanism cannot be used for demolding. Therefore, compared to... Figure 9 The plan, Figure 6 The proposed solution is the better one.

[0034] In other embodiments, such as Figure 10 As shown, the first rib surface 41 and the second rib surface 42 are not bent, but extend directly downwards to connect with the inclined wall 3, so that the first rib surface 41 and the second rib surface 42 form a certain angle, which also makes the width B less than 0.5 times the wall thickness C.

[0035] Specifically, in one embodiment of this utility model, Figure 6 There is a problem with the current solution. Because the bottom of the first rib surface 41 bends towards the second rib surface 42 to form a contraction surface 6, the area where the contraction surface 6 is located is very fragile and prone to breakage. To solve this problem, a secondary rib 43 is provided between the first rib surface 41 of the reinforcing rib 4 and the inclined wall 3. The secondary rib 43 is integrally injection molded with the reinforcing rib 4 and the inclined wall 3. The secondary rib 43 is intersected with the circumferentially extending reinforcing rib 4. The provision of the secondary rib 43 strengthens the structural strength of the reinforcing rib 4, making the reinforcing rib 4 less likely to break radially along the axis L.

[0036] Specifically, in one embodiment of this utility model, such as Figure 11 As shown, there are four stiffeners 4 and four secondary stiffeners 43, which are arranged symmetrically. This structural design makes the stress of the stiffeners 4 on the inclined wall 3 more evenly distributed.

[0037] The following is a detailed explanation of the working principle of this utility model: The working principle of the reinforcing rib anti-shrinkage structure of this utility model is mainly based on the synergistic effect of its special geometric design and injection molding process. During the injection molding process, molten plastic is injected into the mold cavity, filling all structures including the inclined wall 3, reinforcing rib 4, and connecting surface 5. By setting the width of the connecting surface 5 to be less than 0.5 times the wall thickness of the inclined wall 3, the shrinkage rate of the connection area between the reinforcing rib 4 and the inclined wall 3 is relatively small, thereby avoiding local shrinkage caused by uneven thickness. The secondary ribs 43 are arranged crosswise with the reinforcing ribs 4, further enhancing the integrity and flexural strength of the structure and avoiding the risk of breakage due to external forces. This structure ensures reinforcement while taking into account molding quality and production efficiency, and is suitable for injection molded products with high appearance requirements and high structural performance.

[0038] The innovation of this utility model lies in: First, this invention optimizes the connection between the reinforcing ribs and the sloping wall by designing the reinforcing ribs to extend vertically along the mold opening direction. This effectively avoids the shrinkage problem caused by excessive wall thickness in traditional vertical reinforcing ribs, allowing for a simple top-and-bottom mold opening method, significantly reducing mold complexity and manufacturing costs. Second, by setting a shrinkage surface, material accumulation in the connection area is greatly reduced, thereby significantly reducing shrinkage differences in this area during cooling, suppressing shrinkage and depressions, and ensuring product appearance quality and structural consistency. Furthermore, the addition of secondary ribs further enhances the overall structure's bending and fracture resistance, improving the durability and reliability of the parts without increasing wall thickness. This structural design is flexible and highly applicable, and can be widely used in injection-molded products requiring high-strength sloping wall structures, demonstrating good practicality and promotional value.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A reinforcing rib anti-shrinkage structure, characterized in that, The system includes a frame (1), which has an inclined wall (3) that is set at an angle. The inclined wall (3) surrounds and forms a accommodating space (2). The inner wall of the inclined wall (3) facing the accommodating space (2) has at least one reinforcing rib (4). The reinforcing rib (4) is integrally injection molded with the inclined wall (3). The connection between the reinforcing rib (4) and the inclined wall (3) has a connecting surface (5). The wall thickness of the inclined wall (3) is C. The width B of the connecting surface (5) is less than 0.5 times the wall thickness C.

2. The reinforcing bar shrinkage prevention structure according to claim 1, wherein The reinforcing rib (4) has a first rib surface (41) and a second rib surface (42), the first rib surface (41) and the second rib surface (42) are parallel to each other and both extend vertically.

3. The reinforcing bar shrinkage prevention structure according to claim 2, wherein The first rib surface (41) and the second rib surface (42) are connected to the inclined wall (3) at the connection points.

4. The reinforcing bar shrinkage prevention structure according to claim 3, wherein The second rib surface (42) extends vertically and connects to the inclined wall (3), and the bottom of the first rib surface (41) is bent to form a contraction surface (6) which connects to the inclined wall (3).

5. The reinforcing bar shrinkage resistant structure of claim 3, wherein The first rib surface (41) is connected to the inclined wall (3), and the bottom of the second rib surface (42) is bent and connected to the inclined wall (3).

6. The reinforcing bar shrinkage resistant structure of claim 4, wherein The first rib surface (41) and the second rib surface (42) are provided with the rib thickness A of the reinforcing rib (4), the width B of the connecting surface (5) is less than or equal to the rib thickness A, and the rib thickness A is less than the wall thickness C of the inclined wall (3).

7. The reinforcing rib anti-shrinkage structure according to claim 1, characterized in that, The accommodating space (2) is provided with an axis L, and the reinforcing rib (4) extends circumferentially around the axis L.

8. The reinforcing rib anti-shrinkage structure according to claim 7, characterized in that, A secondary rib (43) is provided between the reinforcing rib (4) and the inclined wall (3), and the secondary rib (43) is integrally injection molded with the reinforcing rib (4) and the inclined wall (3).

9. The reinforcing bar shrinkage resistant structure of claim 8, wherein The secondary reinforcing bar (43) is intersected with the circumferentially extending reinforcing bar (4).

10. The reinforced bead water barrier structure of claim 1, wherein, The number of the reinforcing ribs (4) is multiple and they are arranged symmetrically.

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