A sole injection mold

Abstract

This utility model discloses a shoe sole injection mold, which relates to the field of shoe sole production and processing technology. The solution includes: a shoe sole injection mold comprising: a male mold with a molding core and multiple melt flow channels that all penetrate the molding core; a female mold detachably connected to the male mold and having a molding cavity in which the molding core can be embedded to form a cavity; multiple branch pipes corresponding to the multiple melt flow channels and positioned within the corresponding melt flow channels; and a main pipe connected to the multiple branch pipes. This design can slow down the solidification speed of the melt front, shorten the filling cycle, ensure that all areas of the cavity are fully filled, and improve the integrity of the shoe sole molding.

Description

Technical Field

[0001] This utility model relates to the field of shoe sole production and processing technology, specifically to a shoe sole injection mold. Background Technology

[0002] The use of injection molding for shoe soles is a result of the deep coupling of polymer material properties, functional requirements, and industrial logic. From a material transformation perspective, the injection molding process precisely controls the temperature field distribution, allowing solid polymer particles to undergo a continuous phase transition process of melting, flowing, and solidifying. During this process, the rheological properties of the melt can be dynamically controlled to adapt to the performance requirements of different areas of the sole; this controllable fluidity provides the foundation for structural realization. Relying on the rigid constraints of the mold cavity, the injection molding process ensures that the high-temperature melt completely fills the cavity details under high pressure, forming an integrated structure consistent with the design after solidification.

[0003] According to the authorization announcement number (CN220593908U), a shoe sole production injection mold for easy demolding includes a lower mold, a cover plate hinged to one side of the lower mold, and an upper mold fixed to the corresponding side of the cover plate; a lower mold groove is opened at the top of the lower mold, and a push plate is slidably connected to the inner cavity of the lower mold groove. In actual operation, the lower mold and the cover plate are first closed, so that the upper mold and the lower mold form a closed cavity, and then the lower mold groove is injected; after the injection is completed, the operator flips the cover plate, which drives the upper mold to detach from the injection molded part, and then the push plate pushes the molded shoe sole out of the lower mold groove to complete the demolding.

[0004] The structure disclosed in this patent has defects in practical applications, specifically as follows: After the upper and lower molds are closed, when the melt is injected into the cavity from the lower mold groove, it needs to fill the bottom of the lower mold groove first before spreading outwards. During this process, the melt is in continuous contact with the low-temperature inner wall of the lower mold groove, and the rapid heat exchange causes the leading melt to solidify prematurely. This not only shortens the effective flow time but also increases the diffusion resistance of subsequent melt, resulting in a significant extension of the filling cycle. More importantly, in areas with long flow paths, such as deep parts of the cavity, corners, or complex patterns, the prematurely solidified melt may form a flow barrier, preventing subsequent melt from fully filling the cavity, ultimately causing local material shortages or structural incompleteness, affecting the quality of the shoe sole molding. Utility Model Content

[0005] The purpose of this utility model is to provide a shoe sole injection mold that addresses the problem in the prior art where the melt front solidifies prematurely due to continuous contact with the cold mold wall during melt filling, leading to prolonged filling cycle, localized material shortages, and structural incompleteness. This solution can slow down the solidification speed of the melt front, shorten the filling cycle, ensure that all areas of the cavity are fully filled, and improve the integrity of the shoe sole molding.

[0006] This utility model is achieved through the following technical solution:

[0007] A shoe sole injection mold includes: a male mold having a molding core and multiple melt channels that all penetrate the molding core; a female mold detachably connected to the male mold and having a molding cavity for which the molding core can be embedded; multiple branch pipes corresponding to the multiple melt channels and disposed within the corresponding melt channels; and a main pipe connected to the multiple branch pipes.

[0008] Furthermore, in this utility model, the above also includes an elastic reset component; one end of the elastic reset component is connected to the main channel, and the other end of the elastic reset component is connected to the mold; the diversion channel is slidably guided to the inner wall of the melt flow channel, and the diversion channel can reciprocate along the extension direction of the melt flow channel; wherein, during the injection molding process, the output end of the diversion channel can move to the bottom area of ​​the cavity to deliver melt to the bottom area of ​​the cavity.

[0009] Furthermore, in this utility model, the above-mentioned elastic reset component includes: a guide sleeve, the guide sleeve having a hollow structure, the guide sleeve being installed on the male mold; an elastic push shaft, the elastic push shaft being at least partially disposed inside the guide sleeve, the elastic push shaft slidingly guiding and cooperating with the guide sleeve; and a reset spring, the reset spring being disposed inside the guide sleeve, one end of the reset spring being connected to the inner wall of the guide sleeve, and the other end of the reset spring being connected to the elastic push shaft.

[0010] Furthermore, in this utility model, the aforementioned diversion pipe includes: a reference sealing sleeve, one end of which is connected to the main flow pipe; an elastic adapter, one end of which extends to the bottom region of the cavity, and the other end of which is fitted onto the outside of the reference sealing sleeve; wherein, an elastic compensation component is installed between the elastic adapter and the reference sealing sleeve, and the elastic adapter can maintain a close fit with the bottom region of the cavity, thereby dynamically adapting to the contour changes of the bottom region of the cavity.

[0011] Furthermore, in this utility model, the above-mentioned elastic compensation component includes: a first annular boss, which is installed on the outer wall of the reference sealing sleeve; a second annular boss, which is installed on the inner wall of the elastic adapter; and a compression spring, which is fitted on the outer side of the reference sealing sleeve, with one end of the compression spring connected to the first annular boss and the other end of the compression spring connected to the second annular boss.

[0012] Furthermore, in this utility model, the bottom of the aforementioned elastic adapter sidewall is provided with multiple flow-diverting holes.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0014] 1. The shoe sole injection mold in this application uses a design that connects the main channel and multiple branch channels. With the sliding guide of the branch channels and the melt flow channel, the output end of the branch channels can move to the bottom area of ​​the cavity to achieve low-level melt delivery. The continuous replenishment of high-temperature melt can maintain the temperature stability of the bottom of the cavity and avoid rapid melt solidification. This mechanism shortens the melt flow path and eliminates flow barriers, effectively solving the problem of local material shortage caused by premature melt cooling in traditional injection molding. It is especially suitable for processing anti-slip shoe soles with complex structures such as deep grooves and bumps.

[0015] 2. In this application, the diversion pipe adopts a combination structure of a reference sealing sleeve and an elastic adapter, which, together with the elastic compensation component, forms an adaptive adjustment mechanism. When multiple diversion pipes move synchronously, the elastic adapter that contacts the bottom wall of the cavity first can be pushed back by compressing the elastic compensation component, ensuring that all diversion pipes can fit against the bottom of the cavity. This ensures the accuracy of melt delivery from a structural perspective and effectively avoids the problem of insufficient local filling caused by the undulation of the bottom contour of the cavity. It is especially suitable for shoe sole molding conditions where the bottom of the cavity is uneven. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of a shoe sole injection mold;

[0018] Figure 2 This is a schematic diagram of the common mold;

[0019] Figure 3 This is a schematic diagram of the master mold;

[0020] Figure 4 This is a sectional view of the common mold;

[0021] Figure 5 This is a cross-sectional view of the branch pipe.

[0022] The attached diagram shows the markings and corresponding component names:

[0023] 1-Female mold, 2-Male mold, 3-Guide hole, 4-Guide post, 5-Molding core, 6-Molding cavity, 7-Mel flow channel, 8-Diverter pipe, 9-Main flow channel, 10-Guide sleeve, 11-Elastic push shaft, 12-Reset spring, 13-Base sealing sleeve, 14-Elastic adapter, 15-Compression spring, 16-First annular boss, 17-Second annular boss. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0025] Example

[0026] Please refer to Figures 1 to 3 This utility model provides a shoe sole injection mold, including a male mold 2, a female mold 1, multiple branch pipes 8, and a main pipe 9. The male mold 2 has a molding core 5 and multiple melt flow channels 7, all of which extend to the molding core 5. The female mold 1 and the male mold 2 are detachably connected. The female mold 1 has a molding cavity 6. When the male mold 2 and the female mold 1 are closed, the molding core 5 can be embedded in the molding cavity 6, thereby forming a cavity for shoe sole molding. The multiple branch pipes 8 are distributed in a one-to-one correspondence with the multiple melt flow channels 7, and each branch pipe 8 is located inside a corresponding melt flow channel 7. The main pipe 9 is connected to the multiple branch pipes 8, forming a complete melt transport path.

[0027] During the injection molding of shoe soles, the male mold 2 and female mold 1 are first aligned, assembled, and tightened, allowing the molding core 5 to extend into the molding cavity 6 to form a closed cavity. The injection nozzle of the injection molding machine is sealed to the feed end of the main flow channel 9. The injection molding machine injects the molten melt into the main flow channel 9, which then distributes the melt to various branch flow channels 8. From there, the melt is guided into the cavity to complete the filling. The corresponding arrangement of multiple branch flow channels 8 and melt flow channels 7 enables synchronous filling of the melt in different areas of the cavity, improving the diffusion efficiency of the melt, effectively avoiding premature cooling caused by slow melt flow, preventing the formation of flow barriers, and thus solving problems such as localized material shortages and incomplete molding structures, ensuring the molding quality of the shoe sole products.

[0028] In some embodiments of this application, the shoe sole injection mold further includes an elastic reset component, one end of which is connected to the main flow channel 9 and the other end of which is connected to the male mold 2. The outer wall of the diversion channel 8 and the inner wall of the melt flow channel 7 form a sliding guide fit, allowing the diversion channel 8 to reciprocate along the extension direction of the melt flow channel 7. During the injection molding process, the output end of the diversion channel 8 can move to the bottom region of the cavity to deliver melt to the bottom region of the cavity.

[0029] During the sole manufacturing process, the operator can control the main flow channel 9 to move towards the mold 2. This main flow channel 9 then simultaneously drives multiple branch flow channels 8 towards the bottom area of ​​the cavity, ensuring that the melt output from the branch flow channels 8 is discharged from the bottom of the cavity, achieving real-time melt delivery to the bottom area of ​​the cavity. The continuous delivery of high-temperature melt to the bottom area of ​​the cavity not only prevents rapid solidification of the melt in contact with the cavity bottom wall but also enhances the melt's ability to fill complex structures (such as textures and protrusions) at the bottom of the cavity by shortening its flow path, reducing localized insufficient filling due to excessive flow resistance. Simultaneously, the real-time delivery of high-temperature melt maintains the temperature stability at the bottom of the cavity, preventing the formation of a solidified layer due to sudden local temperature drops, thus ensuring the continuous filling capacity of the melt at the bottom of the cavity.

[0030] During this process, the flow front of the melt advances from the bottom of the cavity to the sides and top, while the bottom of the cavity is continuously replenished with high-temperature melt, which can "melt" the condensation layer that may form on the flow front, maintaining the temperature and fluidity of the flow front. This is especially suitable for scenarios with complex cavity structures (such as anti-slip shoe soles with deep grooves and protrusions), which can reduce the problem of incomplete filling caused by excessively thick condensation layers, thereby reducing the generation of defects such as bubbles and material shortages.

[0031] After injection molding is completed, the driving force applied to the main flow channel 9 is removed. The elastic reset component drives the main flow channel 9 to reset, and the main flow channel 9 simultaneously pulls all the branch flow channels 8 to move in the opposite direction along the melt flow channel 7, so that the output end of the branch flow channels 8 is removed from the cavity, providing structural preparation for the next injection molding cycle. This reciprocating motion not only avoids interference between the branch flow channels 8 and the inner wall of the cavity when not in operation, but also ensures the stability of the mold during long-term operation.

[0032] For example, a slider is protruding on the outer wall of the diversion pipe 8, and a corresponding groove is opened on the inner wall of the melt flow channel 7. The slider is embedded in the groove to maintain a clearance fit. When the diversion pipe 8 moves along the extension direction of the melt flow channel 7, the guide and limiting effect of the slider and the groove ensures that the diversion pipe 8 always moves in a straight reciprocating motion along the preset trajectory, avoiding radial deviation or rotation of the diversion pipe 8 during movement, and maintaining the stability and reliability of the melt conveying path.

[0033] Please refer to Figure 4 Specifically, the elastic reset assembly includes a guide sleeve 10, an elastic push shaft 11, and a reset spring 12. The guide sleeve 10 is a hollow structure and is mounted on the male mold 2. At least a portion of the elastic push shaft 11 is disposed inside the guide sleeve 10, and the elastic push shaft 11 and the guide sleeve 10 form a sliding guide fit. The reset spring 12 is disposed inside the guide sleeve 10, with one end connected to the inner wall of the guide sleeve 10 and the other end connected to the elastic push shaft 11.

[0034] The elastic push shaft 11 can move axially relative to the guide sleeve 10, thereby driving the main flow channel 9 to move synchronously. When the return spring 12 is in its natural state, the multiple branch flow channels 8 remain outside the cavity, ensuring that the branch flow channels 8 do not interfere with the cavity during the initial stage of mold closing. During injection molding, the external driving force pushes the elastic push shaft 11 to compress the return spring 12 and move along the guide sleeve 10 towards the male mold 2. The elastic push shaft 11 drives the main flow channel 9 and the branch flow channels 8 to approach the bottom area of ​​the cavity. After injection molding is completed, the external driving force is removed, the return spring 12 releases its elastic potential energy, pushes the elastic push shaft 11 to move in the opposite direction along the guide sleeve 10, thereby driving the main flow channel 9 and the branch flow channels 8 to return to the outside of the cavity, completing one cycle.

[0035] Please refer to Figure 5 In some embodiments of this application, the diversion conduit 8 includes a reference sealing sleeve 13 and an elastic adapter 14. One end of the reference sealing sleeve 13 is connected to the main conduit 9, and one end of the elastic adapter 14 extends to the bottom region of the cavity, while the other end is fitted onto the outside of the reference sealing sleeve 13. An elastic compensation component is provided between the elastic adapter 14 and the reference sealing sleeve 13, allowing the elastic adapter 14 to maintain a close fit with the bottom region of the cavity to dynamically adapt to changes in the contour of the bottom region of the cavity. Furthermore, the elastic adapter 14 can move a corresponding distance along the extension direction of the reference sealing sleeve 13 via the elastic compensation component.

[0036] The bottom wall of the cavity typically has an uneven structure. If each branch pipe 8 needs to extend to the bottom wall of the cavity, the required feed amount for each branch pipe 8 will be different. When the main pipe 9 simultaneously drives multiple branch pipes 8 to move towards the bottom wall of the cavity, the elastic adapter 14 of the branch pipe 8 that first contacts the bottom of the cavity will move towards the reference sealing sleeve 13 under the action of the bottom wall of the cavity, compressing the elastic compensation component until the other branch pipes 8 also move to the bottom wall of the cavity, thereby ensuring that each branch pipe 8 can effectively contact the bottom area of ​​the cavity.

[0037] The flow distribution pipes 8 can adaptively adjust according to the actual contour of the cavity bottom, ensuring that the output ends of all flow distribution pipes 8 maintain a good fit with the cavity bottom area, achieving precise melt delivery to the cavity bottom area. At the same time, the elastic compensation component can also buffer the contact pressure between the flow distribution pipes 8 and the cavity bottom wall to a certain extent, avoiding mold damage caused by rigid contact and extending the mold's service life.

[0038] It should be noted that the reference sealing sleeve 13 passes through the inner side of the elastic adapter 14, forming a sealing fit between the reference sealing sleeve 13 and the elastic adapter 14. This effectively prevents melt leakage during melt transport, ensuring that all melt can be transported to the cavity through the diversion pipe 8. An annular sealing groove is provided between the outer wall of the reference sealing sleeve 13 and the inner wall of the elastic adapter 14, and a high-pressure resistant sealing element is installed in the annular sealing groove. Under the action of elastic pre-tightening force, the sealing element always maintains a tight fit with the contact surfaces of the reference sealing sleeve 13 and the elastic adapter 14. During the relative movement of the reference sealing sleeve 13 and the elastic adapter 14, melt penetration is also effectively prevented.

[0039] In some embodiments of this application, the elastic compensation component comprises a first annular boss 16, a second annular boss 17, and a compression spring 15. The first annular boss 16 is disposed on the outer wall of the reference sealing sleeve 13, the second annular boss 17 is disposed on the inner wall of the elastic adapter 14, and the compression spring 15 is fitted onto the outer side of the reference sealing sleeve 13. One end of the compression spring 15 is connected to the first annular boss 16, and the other end is connected to the second annular boss 17.

[0040] When the elastic adapter 14 moves axially relative to the reference sealing sleeve 13, the compression spring 15 undergoes elastic deformation, driving the first annular boss 16 and the second annular boss 17 to form axial relative displacement compensation, thereby achieving adaptive adjustment of the elastic adapter 14 along the axial direction of the reference sealing sleeve 13. This ensures that the elastic adapter 14 always remains in contact with the bottom area of ​​the cavity, effectively adapting to the contour undulations of the cavity bottom, providing continuous elastic preload for the dynamic sealing fit between the diversion pipe 8 and the cavity bottom, and ensuring the sealing reliability of the melt delivery path.

[0041] In some embodiments of this application, when the elastic adapter 14 fits too tightly with the bottom area of ​​the cavity, potentially affecting melt discharge, the melt can be discharged into the cavity through the diversion orifice. This ensures that even when the elastic adapter 14 is tightly fitted with the bottom of the cavity, the melt can still be stably conveyed through the diversion orifice, avoiding discharge obstruction caused by excessive fitting pressure, ensuring melt filling efficiency in the bottom area of ​​the cavity, and maintaining the sealing of the elastic adapter 14 with the bottom of the cavity, thus ensuring the reliability of the melt delivery path.

[0042] Please refer to Figures 1 to 3In some embodiments of this application, the male mold 2 has multiple guide holes 3 evenly distributed on it, and the female mold 1 has multiple guide posts 4 correspondingly provided on it. The guide posts 4 and the guide holes 3 are distributed coaxially. When the mold is closed, the guide posts 4 are inserted along the axial direction of the guide holes 3 to form a clearance fit guide structure, ensuring the relative positional accuracy of the male mold 2 and the female mold 1. The end of the guide post 4 is provided with an external thread, which forms a tight connection with the internal thread of the bolt. Applying a preload force makes the parting surface of the male mold 2 and the female mold 1 fit and lock together. Annular sealing grooves are machined at the edges of the male mold 2 and the female mold 1, and rubber sealing rings are embedded in the annular sealing grooves. When the mold is in the closed state, the rubber sealing rings undergo elastic deformation, thereby effectively preventing melt leakage and ensuring the sealing reliability of the mold under high-pressure injection molding conditions.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A shoe sole injection mold characterized by, include: A male mold (2) is provided with a molding core (5) and a plurality of melt flow channels (7) are provided on the male mold (2), and the plurality of melt flow channels (7) all pass through the molding core (5); The female mold (1) is detachably connected to the male mold (2). The female mold (1) has a molding cavity (6) and the molding core (5) can be embedded in the molding cavity (6) to form a cavity. Multiple flow dividers (8) are distributed one-to-one with multiple melt channels (7), and the flow dividers (8) are disposed in the corresponding melt channels (7); The main channel (9) is connected to the plurality of branch channels (8).

2. The shoe sole injection mold according to claim 1, characterized in that, It also includes a resilient reset component; One end of the elastic reset component is connected to the main channel (9), and the other end of the elastic reset component is connected to the common mold (2); The diversion pipe (8) is slidably guided to the inner wall of the melt flow channel (7), and the diversion pipe (8) can reciprocate along the extension direction of the melt flow channel (7). During the injection molding process, the output end of the diversion pipe (8) can move to the bottom area of ​​the cavity to deliver melt to the bottom area of ​​the cavity.

3. The shoe sole injection mold according to claim 2, characterized in that, The elastic reset component includes: Guide sleeve (10), the guide sleeve (10) has a hollow structure, and the guide sleeve (10) is installed on the male mold (2); An elastic push shaft (11) is at least partially disposed within the guide sleeve (10), and the elastic push shaft (11) and the guide sleeve (10) are in sliding guide engagement. A reset spring (12) is disposed inside the guide sleeve (10). One end of the reset spring (12) is connected to the inner wall of the guide sleeve (10), and the other end of the reset spring (12) is connected to the elastic push shaft (11).

4. The shoe sole injection mold according to claim 3, characterized in that, The diversion pipe (8) includes: A reference sealing sleeve (13) is provided, one end of which is connected to the main flow pipe (9). An elastic adapter (14) is provided, one end of which extends to the bottom region of the cavity, and the other end of which is fitted onto the outside of the reference sealing sleeve (13). An elastic compensation component is installed between the elastic adapter (14) and the reference sealing sleeve (13). The elastic adapter (14) can fit against the bottom area of ​​the cavity, thereby dynamically adapting to the contour changes of the bottom area of ​​the cavity.

5. The shoe sole injection mold according to claim 4, characterized in that, The elastic compensation component includes: The first annular boss (16) is mounted on the outer wall of the reference sealing sleeve (13); The second annular boss (17) is installed on the inner wall of the elastic adapter (14); A compression spring (15) is fitted on the outside of the reference sealing sleeve (13). One end of the compression spring (15) is connected to the first annular boss (16), and the other end of the compression spring (15) is connected to the second annular boss (17).

6. The shoe sole injection mold according to claim 4 or 5, characterized in that, The bottom of the sidewall of the elastic adapter (14) is provided with multiple flow-diverting holes.

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