Shoemaking mold

Abstract

The utility model relates to the field of shoemaking molds, in particular to a shoemaking mold which comprises an upper mold assembly, a lower mold assembly and a guiding and positioning device. A temperature control device is arranged in the upper die assembly, and dynamic temperature control is achieved through an annular cooling channel and a micropore nozzle. A mold opening auxiliary device is arranged in the lower mold assembly, and intelligent mold opening control is achieved through a pressure sensor and a controller. The die is further provided with an exhaust balance assembly and a self-cleaning structure, the exhaust amount can be dynamically adjusted, and residues can be removed. The guiding and positioning device adopts the design of a low-friction coating and a spherical bulge, so that the opening and closing precision is improved. The temperature control precision can be improved, mold opening opportunity judgment is optimized, the self-cleaning capacity is enhanced, and the high-efficiency, high-quality and intelligent production requirements of the modern shoemaking industry are met.

Description

Technical Field

[0001] This utility model relates to the field of shoemaking technology, and in particular to a shoemaking mold. Background Technology

[0002] With the continuous development of the footwear industry, footwear molds, as core components in footwear production, are widely used in molding processes such as injection molding, foaming, and hot pressing. While existing footwear molds have made some progress in structural design, production efficiency, energy consumption control, and automation, many shortcomings remain, making it difficult to fully meet the modern footwear industry's demands for high-efficiency, high-quality, low-energy, and intelligent production.

[0003] A search revealed a shoe mold with publication number CN113858526B, published on April 21, 2023. This patent proposes a shoe mold comprising an upper mold, a lower mold, a mold opening device, a cooling device, and a heat preservation device. Cooling control is achieved through a movable plug assembly working in conjunction with a cold water channel. An automatic mold opening cylinder is driven by a thermal sensing box, and air pressure compensation is achieved through a supplementary air piston and a heat preservation box structure, thus achieving energy saving and improved product quality. However, this solution still has significant shortcomings: its cooling device relies on a control component to regulate the on / off state of the movable plug, resulting in an intermittent rather than continuous dynamic adjustment of the cooling process. This leads to a delayed temperature control response and is prone to causing uneven cooling in certain areas. Furthermore, its mold opening action relies on the thermal sensing box sensing the temperature and triggering the cylinder, lacking a real-time feedback mechanism for the molding state inside the mold. This makes it impossible to accurately control the mold opening timing based on the actual curing degree, potentially causing incompletely cured shoe parts to be prematurely ejected, affecting product yield.

[0004] A search revealed a shoe mold with publication number CN101961906B, published on January 13, 2016. This technical solution employs a combined structure of an upper mold, lower mold, and mold core, with a material blocking device at the injection port and high-precision guiding sliding achieved through SPR guide pillars, improving the stability and yield of the mold assembly and facilitating maintenance and disassembly. However, this design has significant drawbacks: although the material blocking device is a composite component, it is still prone to micro-displacement or wear due to the high-pressure impact of the molten plastic during high-frequency cyclic use, leading to flash; furthermore, the mold lacks any integrated automatic cleaning or demolding auxiliary structures, requiring periodic manual cleaning of residues within the mold cavity, increasing maintenance costs and downtime; more importantly, the structure lacks intelligent control methods for venting and pressure balance, easily leading to problems such as air entrapment and insufficient filling during complex cavity molding processes, limiting its application in high-precision, high-speed automated production lines.

[0005] The aforementioned problems indicate that existing shoemaking molds still have significant shortcomings in terms of temperature control precision, intelligent mold opening sequence, self-cleaning capability, and long-term operational stability, making it difficult to meet the current demands of the shoemaking industry's transformation and upgrading towards efficient, intelligent, and green manufacturing. Therefore, there is an urgent need to provide a new type of shoemaking mold with optimized structure, an intelligent temperature control and precise mold opening linkage mechanism, and the ability to effectively ensure molding quality and production continuity, in order to overcome the deficiencies of existing technologies. Utility Model Content

[0006] This utility model relates to the field of shoe molds, specifically a shoe mold. It includes an upper mold assembly and a lower mold assembly. The lower mold assembly is located at the bottom of the upper mold assembly, and the upper and lower mold assemblies are connected by a guiding and positioning device. The guiding and positioning device includes guide post sleeves fixedly installed on both sides of the upper mold assembly. Guide posts are slidably connected inside the guide post sleeves, and the bottom ends of the guide posts are fixedly connected to the top of the lower mold assembly. A temperature control device is installed inside the upper mold assembly. The temperature control device includes an annular cooling channel embedded inside the upper mold assembly. Multiple micro-hole nozzles are evenly distributed on the inner wall of the annular cooling channel, and the outlets of the micro-hole nozzles face the mold cavity surface. One end of the annular cooling channel is connected to an inlet pipe, and the other end is connected to an outlet pipe. The outer ends of the inlet and outlet pipes are respectively connected to a circulating pump and a storage tank. A mold opening auxiliary device is installed inside the lower mold assembly. The mold opening auxiliary device includes a pressure sensor embedded inside the lower mold assembly. The sensing surface of the pressure sensor faces the mold cavity, and the signal output end of the pressure sensor is connected to a controller via a wire. The output end of the controller is connected to a mold opening drive device via a wire.

[0007] Preferably, the surface of the temperature control device is provided with an exhaust balancing assembly, which includes an exhaust groove opened on the outside of the annular cooling channel. An adjusting plate is slidably connected inside the exhaust groove. An elastic support rod is fixedly connected to the surface of the adjusting plate. The other end of the elastic support rod is fixedly connected to the inner wall of the exhaust groove. The surface of the adjusting plate is provided with multiple exhaust holes, and the diameter of the exhaust holes gradually decreases along the sliding direction of the adjusting plate. The surface of the exhaust balancing assembly is provided with a self-cleaning structure, which includes a scraper fixedly connected to the surface of the adjusting plate. The surface of the scraper is provided with flexible bristles. The tip of the flexible bristles contacts the surface of the mold cavity. A guide groove is opened inside the scraper. The two ends of the guide groove are respectively connected to the exhaust holes and the surface of the mold cavity.

[0008] Preferably, this invention uses micro-orifice nozzles within an annular cooling channel to spray the cooling medium onto the mold cavity surface in a uniformly dispersed manner, thereby achieving dynamic temperature regulation of the mold cavity and avoiding the uneven cooling problem caused by traditional intermittent cooling methods. Simultaneously, the arrangement density of the micro-orifice nozzles is differentiated according to the heat load of different areas of the mold cavity, making the cooling effect more precise and controllable. Furthermore, a pressure sensor monitors the pressure changes inside the mold cavity in real time and transmits the signal to the controller. The controller determines the molding state based on the pressure changes and controls the timing of the mold opening drive device, avoiding product quality problems caused by opening the mold too early or too late.

[0009] Preferably, the adjusting plate inside the venting groove, under the action of the elastic support rod, always adheres to the surface of the mold cavity. The venting holes on the adjusting plate automatically adjust their positions according to the pressure inside the mold cavity, thereby achieving dynamic balance of venting volume. When the pressure inside the mold cavity is high, the adjusting plate moves away from the mold cavity, increasing the opening area of ​​the venting holes and accelerating the venting process. When the pressure decreases, the adjusting plate moves closer to the mold cavity, decreasing the opening area of ​​the venting holes and maintaining a stable venting state. The scraper slides along the surface of the mold cavity under the action of the adjusting plate, and the flexible bristles can remove residues from the surface of the mold cavity, preventing blockage or scale buildup after long-term use. The guide channel guides the cleaned residues to the venting holes and out of the mold cavity through the venting groove, thereby achieving a self-cleaning function.

[0010] Preferably, a low-friction coating is provided between the guide post sleeve and the guide post in the guiding and positioning device. The surface roughness of the low-friction coating is Ra0.2 to Ra0.4. A spherical protrusion is provided at the end of the guide post, forming a rolling contact with the inner wall of the guide post sleeve, thereby reducing the friction generated during the guiding process and improving the smoothness and accuracy of mold opening and closing. The inner wall of the annular cooling channel is provided with an anti-corrosion layer with a thickness of 0.1 mm to 0.3 mm. The anti-corrosion layer is made of nickel-based alloy material, which can effectively resist the corrosion of the channel inner wall by the cooling medium and extend the service life of the mold.

[0011] This invention addresses the shortcomings of existing shoe molds in terms of temperature control accuracy, intelligent mold opening, and self-cleaning capabilities through the above-mentioned technical solution. It provides a new type of shoe mold with dynamic temperature control, real-time feedback on mold opening timing, and automatic cleaning functions, meeting the needs of the modern shoe industry for high-efficiency, high-quality, low-energy consumption, and intelligent production. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model. Figure 2 This is a schematic diagram of the internal structure of this utility model. Figure 3 This is a schematic diagram of the internal structure of the upper mold assembly of this utility model. Figure 4 This is a schematic diagram of the outer structure of the flexible bristles of this utility model.

[0013] The attached figures are labeled as follows: 1. Upper mold assembly; 2. Lower mold assembly; 3. Guide pillar sleeve; 4. Guide pillar; 5. Annular cooling channel; 6. Micro-orifice nozzle; 7. Liquid inlet pipe; 8. Liquid outlet pipe; 9. Pressure sensor; 10. Controller; 11. Mold opening drive device; 12. Venting groove; 13. Adjusting plate; 14. Elastic support rod; 15. Venting hole; 16. Scraper; 17. Flexible bristles; 18. Guide groove; 19. Spherical protrusion; 20. Low-friction coating; 21. Anti-corrosion layer. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0015] Specific implementation examples are given below.

[0016] This utility model relates to a shoe mold, including an upper mold assembly 1 and a lower mold assembly 2, which are connected and cooperated by a guiding and positioning device. The guiding and positioning device consists of guide post sleeves 3 fixedly installed on both sides of the upper mold assembly 1 and guide posts 4 slidably connected inside the guide post sleeves 3. The bottom end of the guide post 4 is fixedly connected to the top of the lower mold assembly 2. The inner wall of the guide post sleeve 3 is provided with a low-friction coating 20, the surface roughness of which is Ra0.2 to Ra0.4. The end of the guide post 4 is provided with a spherical protrusion 19, which forms a rolling contact with the inner wall of the guide post sleeve 3. This structural design reduces the friction generated during the guiding process, thereby improving the smoothness and accuracy of the mold opening and closing.

[0017] The upper mold assembly 1 is equipped with a temperature control device, which includes an annular cooling channel 5 embedded inside the upper mold assembly 1. Multiple micro-orifice nozzles 6 are evenly distributed on the inner wall of the annular cooling channel 5, with the outlets of the micro-orifice nozzles 6 facing the mold cavity surface. One end of the annular cooling channel 5 is connected to an inlet pipe 7, and the other end is connected to an outlet pipe 8. The outer ends of the inlet pipe 7 and the outlet pipe 8 are respectively connected to a circulating pump and a storage tank. The inner wall of the annular cooling channel 5 is also provided with an anti-corrosion layer 21, with a thickness of 0.1mm to 0.3mm, made of nickel-based alloy material, which can effectively resist the corrosion of the channel inner wall by the cooling medium and extend the service life of the mold. The arrangement density of the micro-orifice nozzles 6 is differentiated according to the heat load of different areas of the mold cavity, making the cooling effect more precise and controllable.

[0018] An exhaust balancing assembly is provided on the surface of the temperature control device. The exhaust balancing assembly includes an exhaust groove 12 opened on the outside of the annular cooling channel 5. An adjusting plate 13 is slidably connected inside the exhaust groove 12. An elastic support rod 14 is fixedly connected to the surface of the adjusting plate 13. The other end of the elastic support rod 14 is fixedly connected to the inner wall of the exhaust groove 12. Multiple exhaust holes 15 are opened on the surface of the adjusting plate 13. The diameter of the exhaust holes 15 gradually decreases along the sliding direction of the adjusting plate 13. When the pressure inside the mold cavity is high, the adjusting plate 13 moves away from the mold cavity under the action of the elastic support rod 14, and the opening area of ​​the exhaust holes 15 increases, thereby accelerating the exhaust process. When the pressure decreases, the adjusting plate 13 moves closer to the mold cavity, and the opening area of ​​the exhaust holes 15 decreases, thereby maintaining a stable exhaust state.

[0019] The surface of the exhaust balancing assembly is provided with a self-cleaning structure, which includes a scraper 16 fixedly connected to the surface of the adjusting plate 13. The surface of the scraper 16 is provided with flexible bristles 17, and the tips of the flexible bristles 17 are in contact with the surface of the mold cavity. A guide groove 18 is opened inside the scraper 16, and the two ends of the guide groove 18 are respectively connected to the exhaust hole 15 and the surface of the mold cavity. During the opening and closing of the mold, the adjusting plate 13 drives the scraper 16 to slide along the surface of the mold cavity. The flexible bristles 17 can remove the residue on the surface of the mold cavity and prevent blockage or dirt accumulation after long-term use. The cleaned residue is guided to the exhaust hole 15 through the guide groove 18 and discharged from the mold cavity through the exhaust groove 12, thereby realizing the self-cleaning function.

[0020] The lower mold assembly 2 is equipped with a mold opening auxiliary device, which includes a pressure sensor 9 embedded inside the lower mold assembly 2. The sensing surface of the pressure sensor 9 faces the mold cavity. The signal output terminal of the pressure sensor 9 is connected to the controller 10 through a wire. The output terminal of the controller 10 is connected to the mold opening drive device 11 through a wire. The pressure sensor 9 monitors the pressure changes inside the mold cavity in real time and transmits the signal to the controller 10. The controller 10 determines the molding state based on the pressure changes and controls the timing of the action of the mold opening drive device 11. This design avoids product quality problems caused by opening the mold too early or too late.

[0021] In actual operation, the upper mold assembly 1 and the lower mold assembly 2 are first closed, and precise positioning is achieved through the cooperation of the guide post sleeve 3 and the guide post 4 in the guide positioning device. At this time, the cooling medium in the annular cooling channel 5 flows in through the liquid inlet pipe 7 and is sprayed onto the mold cavity surface in a uniformly dispersed manner through the micro-orifice nozzle 6, thereby achieving dynamic adjustment of the mold cavity temperature. The adjusting plate 13 in the exhaust balance assembly is always in contact with the mold cavity surface under the action of the elastic support rod 14. The exhaust hole 15 on the adjusting plate 13 automatically adjusts its position according to the pressure inside the mold cavity, thereby achieving dynamic balance of exhaust volume. At the same time, the scraper 16 in the self-cleaning structure slides along the mold cavity surface under the drive of the adjusting plate 13. The flexible bristles 17 can remove the residue on the mold cavity surface. The cleaned residue is guided to the exhaust hole 15 through the guide groove 18 and discharged from the mold cavity through the exhaust groove 12.

[0022] During the injection molding process, the pressure sensor 9 monitors the pressure changes inside the mold cavity in real time and transmits the signal to the controller 10. The controller 10 judges the molding state based on the pressure changes and controls the timing of the mold opening drive device 11. When the injection molding is completed and the pressure inside the mold cavity drops to the set value, the controller 10 issues a command, the mold opening drive device 11 starts, the upper mold assembly 1 separates from the lower mold assembly 2, and one injection molding cycle is completed. Throughout the process, the low-friction coating 20 and the spherical protrusions 19 in the guide positioning device ensure the smoothness and accuracy of the mold opening and closing, while the anti-corrosion layer 21 protects the annular cooling channel 5 from the corrosion of the cooling medium and extends the service life of the mold.

[0023] This utility model solves the shortcomings of existing shoe molds in terms of temperature control accuracy, intelligent mold opening, and self-cleaning ability through the above-mentioned structural design, and meets the needs of the modern shoe industry for high-efficiency, high-quality, low-energy consumption and intelligent production. In order to enable those skilled in the art to fully understand and implement this utility model, the implementation principle of this utility model is further explained below in conjunction with specific application scenarios.

[0024] In the actual operation of shoe mold making, the upper mold assembly 1 and the lower mold assembly 2 are first closed. The initial positioning of the mold is completed by the precise cooperation between the guide post sleeve 3 and the guide post 4 in the guide positioning device. The low-friction coating 20 on the inner wall of the guide post sleeve 3 and the spherical protrusion 19 at the end of the guide post 4 form rolling contact during the mold opening and closing process, thereby significantly reducing friction and ensuring that the mold opening and closing action is smooth and accurate. This design solves the positioning deviation problem caused by excessive friction in traditional molds and improves the stability and service life of the mold operation.

[0025] After the mold closes, the cooling medium flows into the annular cooling channel 5 through the inlet pipe 7 and is evenly sprayed onto the surface of the mold cavity through the micro-orifice nozzles 6. The arrangement density of the micro-orifice nozzles 6 is differentiated according to the heat load of different areas of the mold cavity, making the cooling effect more precise and controllable. For example, in the high heat load area of ​​the mold cavity, the arrangement density of the micro-orifice nozzles 6 is higher to enhance the local cooling capacity; while in the low heat load area, the arrangement density is relatively lower to avoid temperature unevenness caused by over-cooling. This dynamic cooling method effectively solves the problem of uneven cooling in the traditional intermittent cooling method, while improving the temperature control accuracy of the mold.

[0026] During the injection molding process, the adjusting plate 13 in the venting balance assembly remains in contact with the mold cavity surface under the action of the elastic support rod 14. When the pressure inside the mold cavity increases, the adjusting plate 13 moves away from the mold cavity, and the opening area of ​​the venting hole 15 increases accordingly, thereby accelerating the venting process and preventing gas stagnation from affecting product quality. When the pressure inside the mold cavity decreases, the adjusting plate 13 moves closer to the mold cavity, and the opening area of ​​the venting hole 15 decreases, maintaining a stable venting state. This dynamic adjustment mechanism realizes adaptive control of the venting volume, ensuring the stability of the internal pressure of the mold.

[0027] Meanwhile, the scraper 16 in the self-cleaning structure slides along the surface of the mold cavity under the action of the adjusting plate 13, and the flexible bristles 17 can remove the residue on the surface of the mold cavity. The removed residue is guided to the vent 15 through the guide groove 18 inside the scraper 16, and finally discharged from the mold cavity through the vent groove 12. This design not only avoids the problem of dirt accumulation and blockage on the surface of the mold cavity after long-term use, but also reduces the frequency of manual cleaning and significantly improves production efficiency.

[0028] After injection molding is completed, pressure sensor 9 monitors the pressure changes inside the mold cavity in real time and transmits the signal to controller 10. When the pressure inside the mold cavity drops to the set value, controller 10 determines that molding is complete and issues a command to start mold opening drive device 11, so that upper mold assembly 1 and lower mold assembly 2 are separated. This intelligent control method avoids product quality problems caused by mold opening too early or too late, and improves the automation level of the production process.

[0029] Throughout the operation, the anti-corrosion layer 21 provides effective protection for the inner wall of the annular cooling channel 5, preventing the cooling medium from corroding the inner wall of the channel, thereby extending the service life of the mold; in addition, the low friction design between the guide post sleeve 3 and the guide post 4 further improves the smoothness of mold opening and closing, ensuring the reliability of the mold in high-frequency use.

[0030] In summary, by combining the above steps and principles, this utility model achieves a comprehensive improvement in the temperature control accuracy, intelligent mold opening, and self-cleaning ability of shoe molds, thus meeting the needs of the modern shoe manufacturing industry for efficient, intelligent, and green manufacturing.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A shoe-making mold, characterized in that: The assembly includes an upper mold assembly (1) and a lower mold assembly (2). The lower mold assembly (2) is located at the bottom of the upper mold assembly (1). The upper mold assembly (1) and the lower mold assembly (2) are connected by a guide positioning device. The guide positioning device includes guide post sleeves (3) fixedly installed on both sides of the upper mold assembly (1). A guide post (4) is slidably connected inside the guide post sleeve (3). The bottom end of the guide post (4) is fixedly connected to the top of the lower mold assembly (2). A temperature control device is provided inside the upper mold assembly (1). The temperature control device includes an annular cooling channel (5) embedded inside the upper mold assembly (1). Multiple micro-hole nozzles are evenly distributed on the inner wall of the annular cooling channel (5). (6) The outlet of the micro-orifice nozzle (6) faces the surface of the mold cavity. One end of the annular cooling channel (5) is connected to the liquid inlet pipe (7) and the other end is connected to the liquid outlet pipe (8). The outer ends of the liquid inlet pipe (7) and the liquid outlet pipe (8) are respectively connected to the circulating pump and the liquid storage tank. The lower mold assembly (2) is provided with a mold opening auxiliary device. The mold opening auxiliary device includes a pressure sensor (9) embedded in the lower mold assembly (2). The sensing surface of the pressure sensor (9) faces the mold cavity. The signal output end of the pressure sensor (9) is connected to the controller (10) through a wire. The output end of the controller (10) is connected to the mold opening drive device (11) through a wire.

2. The shoe-making mold according to claim 1, characterized in that: The surface of the temperature control device is provided with an exhaust balance assembly, which includes an exhaust groove (12) opened on the outside of the annular cooling channel (5). An adjustment plate (13) is slidably connected inside the exhaust groove (12). An elastic support rod (14) is fixedly connected to the surface of the adjustment plate (13). The other end of the elastic support rod (14) is fixedly connected to the inner wall of the exhaust groove (12). A plurality of exhaust holes (15) are opened on the surface of the adjustment plate (13). The diameter of the exhaust holes (15) gradually decreases along the sliding direction of the adjustment plate (13).

3. A shoe-making mold according to claim 2, characterized in that: The surface of the exhaust balance component is provided with a self-cleaning structure, which includes a scraper (16) fixedly connected to the surface of the adjustment plate (13). The surface of the scraper (16) is provided with flexible bristles (17). The top of the flexible bristles (17) contacts the surface of the mold cavity. The scraper (16) has a guide groove (18) inside. The two ends of the guide groove (18) are respectively connected to the exhaust hole (15) and the surface of the mold cavity.

4. A shoe-making mold according to claim 1, characterized in that: A low-friction coating (20) is provided between the guide post sleeve (3) and the guide post (4) in the guiding and positioning device. The surface roughness of the low-friction coating (20) is Ra0.2 to Ra0.

4. A spherical protrusion (19) is provided at the end of the guide post (4). The spherical protrusion (19) forms a rolling contact with the inner wall of the guide post sleeve (3).

5. A shoe-making mold according to claim 1, characterized in that: The inner wall of the annular cooling channel (5) is provided with an anti-corrosion layer (21), the thickness of which is 0.1 mm to 0.3 mm, and the anti-corrosion layer (21) is made of nickel-based alloy material.

6. A shoe-making mold according to claim 1, characterized in that: The arrangement density of the micro-orifice nozzles (6) is designed differently according to the heat load of different areas of the mold cavity.

7. A shoe-making mold according to claim 2, characterized in that: The adjusting plate (13) always fits the mold cavity surface under the action of the elastic support rod (14), and the vent hole (15) on the adjusting plate (13) automatically adjusts its position according to the pressure inside the mold cavity.

8. A shoe-making mold according to claim 3, characterized in that: The scraper (16) slides along the surface of the mold cavity under the action of the adjusting plate (13), and the flexible bristles (17) remove the residue on the surface of the mold cavity. The removed residue is guided to the vent hole (15) through the guide groove (18) and discharged from the mold cavity through the vent groove (12).

9. A shoe-making mold according to claim 1, characterized in that: The pressure sensor (9) monitors the pressure changes inside the mold cavity in real time and transmits the signal to the controller (10). The controller (10) judges the molding state based on the pressure changes and controls the timing of the mold opening drive device (11).

10. A shoe-making mold according to claim 1, characterized in that: The number of guide post sleeves (3) is two, which are symmetrically arranged on both sides of the upper mold assembly (1).

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