A sole steam forming mold and a sole

Abstract

The application relates to the technical field of molds, and provides a shoe sole steam forming mold and a shoe sole, the mold comprises an upper mold and a lower mold arranged oppositely and a middle mold arranged between the upper mold and the lower mold, the middle mold comprises a first part arranged in the middle, two second parts arranged on the upper side and the lower side of the first part respectively, and a limiting part detachably connected to the second part, a limiting gap for limiting a foamed sheet and / or a film is formed between the outer peripheral wall of the limiting part and the inner peripheral wall of the second part. The upper edge and the lower edge of the limiting part are installed in the middle mold through the limiting part, so that the limiting effect is achieved, the flattening effect is relatively good compared with the prior art, the required time is relatively reduced, and deviation is not prone to occurring, so that the precision and the quality of shoe sole forming are guaranteed, and the stability and the reliability of shoe sole steam forming are improved.

Description

Technical Field

[0001] This application relates to the technical field of molds, and in particular to a steam forming mold for shoe soles, i.e., shoe soles. Background Technology

[0002] In the footwear manufacturing industry within the machinery sector, sole performance has always been a key factor affecting shoe quality and wearing experience. As people's demands for comfort during sports and daily activities continue to increase, the shock absorption performance of soles is receiving increasing attention.

[0003] In existing technologies, "popcorn" soles are used to achieve shock absorption in shoe soles. However, most existing popcorn soles are made of ETPU foam particles. Although ETPU foam particles have excellent performance, their granular distribution and dispersion mean that the bonding between adjacent particles is easily contaminated during use. Therefore, sometimes a coating is chosen. Furthermore, to reduce excessive deformation of the edges of these granular soles under frequent stress, a layer of foam sheet is applied to the sidewalls of the sole.

[0004] Because existing molds typically consist of upper and lower molds, the membrane is laid flat in the cavity of the lower mold, and then moved from the upper mold to the lower mold to form the corresponding shoe cavity. Foamed granules are then injected for integral molding via steam forming. However, due to the inherent flexibility of the membrane or the elasticity of the foamed sheet, it is actually difficult to lay flat, requiring relatively more time. Furthermore, deviations are more likely to occur during production, resulting in relatively poor quality soles and a higher wastage rate. Therefore, further improvements are needed. Utility Model Content

[0005] To address the above problems, this application provides a steam forming mold for shoe soles and a shoe sole.

[0006] This application provides a steam forming mold and sole for shoe soles, employing the following technical solution: A shoe sole steam forming mold includes an upper mold and a lower mold arranged opposite to each other, and a middle mold disposed between the two. The middle mold includes a first part disposed in the middle, two second parts disposed on the upper and lower sides of the first part respectively, and a limiting part detachably connected to the second parts. A limiting gap is formed between the outer peripheral wall of the limiting part and the inner peripheral wall of the second part to limit the foamed sheet and / or film.

[0007] By adopting the above technical solution, the foamed sheet or film is attached to the inner wall of the intermediate mold, and the upper and lower edges are installed in the intermediate mold by the limiting part to play a limiting role. Compared with the existing technology, the flattening effect is relatively better, the time required is relatively reduced, and it is not easy to deviate, thereby ensuring the precision and quality of the sole molding and helping to improve the stability and reliability of the sole steam molding.

[0008] Preferably, the first part is provided with an exhaust port.

[0009] By adopting the above technical solution, an exhaust hole is provided on the first part, which can increase the subsequent steam circulation range and flow rate, thereby improving the steam forming effect of the foamed shoe sole.

[0010] Preferably, the limiting part is located at the toe of the shoe and is provided as an opening, or is provided as a limiting ring.

[0011] By adopting the above technical solution, the limiting part is located at the toe of the shoe and is open to accommodate foam sheets or films of different thicknesses, thereby improving the adaptability of the limiting part when foam sheets or films are installed. Furthermore, setting the limiting part as a limiting ring improves its fixing effect on the ends of the foam sheets and films, allowing the foam sheets and films to be arranged in a ring and fixed to the foam granule-molded sole.

[0012] Preferably, the limiting part has a limiting block protruding from the edge away from the first part, the limiting block is arranged at intervals along the circumference of the limiting part, and the surfaces of the two second parts that are far apart from each other are provided with slots for the limiting block to be inserted.

[0013] By adopting the above technical solution, the limiting part is installed on the second part through the cooperation between the limiting block and the slot, so as to improve the limiting effect on the foamed sheet or film and reduce the possibility of displacement of the foamed sheet or film.

[0014] Preferably, the inner surface of the second part is provided with an air extraction hole, the second part is hollow, and the second part is provided with an air extraction end to extract air so that the second part is in a negative pressure state.

[0015] By adopting the above technical solution, the inner surface of the second part is provided with air extraction holes and the interior is hollow. By extracting air from the extraction end to create a negative pressure state inside the second part, the foamed sheet or film is pre-positioned before being fixed by the limiting part, which helps to improve the limiting of the foamed sheet or film. It should be noted that for the limiting of the foamed sheet, since it itself contains pores, continuous air extraction is required to ensure that it is relatively attached to the second part, thereby reducing the possibility of displacement, ensuring accurate positioning of the sheet, and thus improving the quality of the shoe sole molding.

[0016] Preferably, the second part is recessed to form a limiting groove, so that the foamed sheet or film can be inserted into the limiting groove through the limiting part, and the inner peripheral wall of the limiting part is flush with the inner peripheral wall of the first part.

[0017] By adopting the above technical solution, the second part is recessed to form a limiting groove, which allows the foamed sheet or film to be embedded in the limiting groove after being limited by the limiting part, thereby improving the limiting effect on the foamed sheet; and it can also make the inner peripheral wall of the limiting part flush with the inner peripheral wall of the first part, which is conducive to the uniform distribution of foamed particles during steam forming and improves the forming quality of the shoe sole.

[0018] Preferably, the second part is provided with a plurality of film-clamping needles along its own circumference.

[0019] By adopting the above technical solution, the diaphragm, due to its thinness and certain extensibility, can be stretched within a certain range. The diaphragm pin allows one end of the diaphragm to be first clipped onto the first part on one side. After being restricted by the limiting part, a certain pulling force is applied to pull the diaphragm to adhere to the two second parts and one first part, and then it is clipped onto the diaphragm pin. After being released, the diaphragm returns to its original elasticity, thus achieving a taut and relatively flat state, which further improves the subsequent shoe sole molding quality.

[0020] Preferably, a boss edge is formed at the transition position between the first part and the second part, and the boss edge has a plurality of air extraction holes along its own circumference.

[0021] By adopting the above technical solution, several air extraction holes are opened along the edge of the boss at the transition position between the first and second parts. Compared with opening several air extraction holes for limiting, the number of air extraction holes set on the edge of the boss will be reduced. Under the same extraction state, the negative pressure effect will be better, reducing the possibility of displacement of the installed foam sheet or membrane, and further improving the molding quality of the subsequent shoe sole.

[0022] Preferably, the edge of the second part is provided with a first groove to form an L-shaped step, and a number of air extraction holes are also provided in the first groove.

[0023] By adopting the above technical solution, a first groove is also provided on the edge of the second part to form an L-shaped step, and several air extraction holes are provided so that the foamed sheet and film placed inside can fit relatively well and have a high degree of fit.

[0024] A shoe sole comprises, from the inside out, a first shock-absorbing part composed of foamed particles, a second shock-absorbing part composed of foamed sheets, and a coating layer consisting of a membrane covering the outer surface of the second shock-absorbing part, wherein the foamed particles, foamed sheets, and membrane are integrally formed.

[0025] By adopting the above technical solution, during production, the diaphragm can be first placed in the limiting gap, abutting against the inner peripheral wall of the second part, and then the foamed sheet can be placed. Subsequently, the limiting part is embedded in the second part to abut against the foamed sheet, thereby limiting the foamed sheet and the diaphragm within the limiting gap. Then, the middle mold is installed between the upper and lower molds for subsequent operations to obtain the desired shoe sole by integrally molding the foamed particles, foamed sheet, and diaphragm.

[0026] In summary, this application has the following beneficial effects: 1. Foamed granules and sheets are the same type of foamed material. Under the same steam forming conditions, they can be directly integrally molded to obtain the required shoe sole. They have high compatibility and good adhesion between the two. No additional adhesive is required, which also eliminates the traditional additional gluing process, reduces costs and improves production efficiency. 2. A limiting gap is formed between the outer peripheral wall of the limiting part and the inner peripheral wall of the second part, which can limit the foamed sheet or film; 3. The second part is equipped with an air extraction hole and an air extraction device to create a negative pressure state inside the second part, which is beneficial for the positioning of the sheet material, reduces the possibility of displacement, and improves the molding quality of the shoe sole. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a shoe sole steam forming mold according to Embodiment 1 of this application; Figure 2 This is a schematic diagram of the structure of the intermediate mold in Embodiment 1 of this application; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the air extraction end in Embodiment 1 of this application; Figure 5 This is a cross-sectional structural diagram of a shoe sole according to Embodiment 2 of this application.

[0028] Figure 6 This is a schematic diagram of the distribution structure of the air extraction holes in Embodiment 3 of this application; Figure 7 This is a cross-sectional structural diagram of Embodiment 3 of this application; Figure 8 This is a schematic diagram of one of the structures of the film-clamping needle in Embodiment 4 of this application.

[0029] Figure 9 This is a schematic diagram of the structure of the second groove in Embodiment 4 of this application; Figure 10 This is a schematic diagram of another structure of the film-clamping needle in Embodiment 4 of this application.

[0030] Explanation of reference numerals in the attached drawings: 1. Upper mold; 11. Shoe last; 2. Lower mold; 21. Shoe sole last; 3. Middle mold; 31. First part; 32. Second part; 321. Limiting groove; 322. Air extraction hole; 323. Air extraction end; 324. Valve; 325. Slot; 326. First groove; 33. Limiting part; 331. Limiting gap; 332. Limiting block; 333. Second groove; 34. Fixing part; 4. Mold frame; 5. Edge of boss; 6. First shock-absorbing part; 61. Second shock-absorbing part; 62. Coating layer; 7. Film clamping pin. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1 - Appendix Figure 10 This application will be described in further detail below.

[0032] This application discloses a steam forming mold for shoe soles and a shoe sole.

[0033] Example 1: A steam forming mold for shoe soles, as shown in the reference Figure 1 It includes an upper mold 1 and a lower mold 2 arranged opposite to each other, a middle mold 3 arranged between the two, and a mold frame 4 fitted outside the middle mold 3. The upper mold 1 and the lower mold 2 are respectively provided with a shoe last 11 and a shoe sole last 21 on their close surfaces, which both extend into the middle mold 3, thus forming the shoe cavity required for shoe sole forming, providing the necessary space and conditions for the steam forming of the shoe sole.

[0034] Reference Figure 2 The middle mold 3 specifically includes a first part 31 located in the middle, two second parts 32 respectively located on the upper and lower sides of the first part 31, a limiting part 33 detachably connected to the second part 32, and a fixing part 34 located on the limiting part 33. A limiting gap 331 is formed between the outer peripheral wall of the limiting part 33 and the inner peripheral wall of the second part 32 to limit the displacement of the foamed sheet or film. The shoe cavity is specifically composed of the first part 31, the shoe last 11 of the upper mold 1, and the shoe sole last 21 of the lower mold 2.

[0035] Reference Figure 2 , Figure 3 In this embodiment, the first part 31 is provided with a number of vent holes so that the steam input into the shoe cavity through the upper mold 1 and the lower mold 2 can enter the mold frame 4 through the vent holes, or the steam input through the mold frame 4 can enter the shoe cavity through the vent holes, so as to improve the steam circulation range and thus improve the subsequent steam forming effect.

[0036] The second part 32 is integrally formed with the first part 31. The inner surface of the second part 32 is recessed to form a limiting groove 321, which allows the foamed sheet or film to be inserted into the limiting part 33 through the limiting strip, so that the inner peripheral wall of the subsequent limiting part 33 can be flush with the inner peripheral wall of the first part 31.

[0037] Reference Figure 2 , Figure 4 Furthermore, to improve the fixing effect of the foamed sheet or film, in this embodiment, the inner surface of the second part 32 is provided with a plurality of air extraction holes 322, and the second part 32 is hollow. An air extraction end 323 is provided on the second part 32. In this embodiment, one air extraction end 323 is provided and is located on the outer peripheral wall of the lower second part 32. The middle first part 31 is provided with a flow groove (not shown in the figure) for connecting the two second parts 32. A valve 324 is provided on the air extraction end 323 to allow for air extraction with an external air extraction device, creating a negative pressure state inside the second part 32. This allows for pre-positioning of the foamed sheet or film before fixing by the limiting part 33, and facilitates smoothing of uneven areas, thereby improving the subsequent fixing effect and ultimately improving the quality of the shoe sole molding.

[0038] It should be noted that, for the positioning of the foamed sheet, since it contains pores, continuous air extraction is required to ensure that it is relatively attached to the second part 32, thereby reducing the possibility of displacement, ensuring accurate positioning of the sheet, and thus improving the quality of the shoe sole molding.

[0039] The limiting part 33 is a limiting strip. According to the shape of the sole, in this embodiment, the limiting strip is set in an open position at the toe. Since the thickness of the foam sheet or film selected during the processing is between 1-10mm, for thicker foam sheets or films, the limiting strip is set in an open position to allow for a certain deformation effect, thereby improving the compatibility between the limiting strip and foam sheets or films of different thicknesses, and reducing the cost of having to set multiple limiting strips.

[0040] Regarding the detachable connection between the limiting strip and the second part 32, specifically, a limiting block 332 protrudes from the edge of the limiting strip away from the first part 31. The limiting blocks 332 are spaced apart along the circumference of the limiting strip. Each of the two mutually distant surfaces of the second part 32 has a slot 325 for the limiting blocks 332 to engage. The engagement between the limiting blocks 332 and the slots 325 is a snap-fit ​​connection. This connection method is simple and reliable, facilitating the installation and removal of the limiting part 33. The size and shape of the limiting blocks 332 and the slots 325 need to match each other to ensure the stability of the engagement. For example, the limiting blocks 332 can be designed as trapezoidal or rectangular, and the slots 325 are correspondingly designed as first grooves 326 that fit the shape of the limiting blocks 332.

[0041] In another embodiment, the limiting part 33 can be configured as a limiting ring. The limiting part 33 configured as a limiting ring is applicable to the production of some foamed sheets or films with relatively fixed thicknesses, as well as the production of shoe soles formed by wrapping foamed sheets or films around foamed particles in a ring.

[0042] The fixing part 34 has two parts, which are respectively disposed on the two second parts 32 and connected to the upper mold 1 and the lower mold 2, respectively, to restrict the middle mold 3. The fixing part 34 specifically includes a number of fixing protrusions, which are arranged at intervals around the circumference of the second part 32. Correspondingly, positioning grooves (not shown in the figure) can be opened on the upper mold 1 and the lower mold 2 for the fixing protrusions to be engaged, so as to restrict the displacement of the middle mold 3.

[0043] The mold frame 4 serves to support and protect the entire mold. Foamed particles are injected into the shoe cavity, steam-formed, and the foamed particles and sheet are integrally formed to obtain the desired one-piece molded sole.

[0044] The implementation principle of a shoe sole steam forming mold in this application embodiment is as follows: the shoe sole steam forming mold achieves the integrated steam forming of sheet material and foamed particles through the reasonable cooperation of upper mold 1, lower mold 2 and middle mold 3, and the coordinated work of various components inside the middle mold 3.

[0045] The design of the limiting gap 331 formed by the limiting part 33 and the second part 32, the snap-fit ​​connection between the limiting block 332 and the slot 325, and the negative pressure environment formed by the set air extraction hole 322 effectively improves the limiting effect on the foamed sheet or film, reduces the possibility of sheet displacement, and ensures the molding quality of the shoe sole.

[0046] Example 2: A type of shoe sole, reference Figure 5 The sole comprises, from the inside out, a first shock-absorbing part 6 composed of foamed particles, a second shock-absorbing part 61 composed of foamed sheets, and a coating layer 62 covered by a diaphragm on the outer surface of the second shock-absorbing part 61. The foamed particles, foamed sheets, and diaphragm are integrally formed by steam molding.

[0047] The sole can be produced using the steam forming mold described in Example 1. Specifically, the diaphragm is first placed in the limiting gap 331, abutting against the inner peripheral wall of the second part 32. Then, the foamed sheet is placed in the second part 32, and the limiting part 33 is then inserted into the second part 32 to abut against the foamed sheet, thereby limiting the foamed sheet and diaphragm within the limiting gap 331. Subsequently, the middle mold 3 is installed between the upper and lower molds 2 for further operations to obtain the desired sole by integrally molding the foamed particles, foamed sheet, and diaphragm.

[0048] Example 3: Reference Figure 6 , Figure 7 The difference from Embodiment 1 is that a boss edge 5 is formed at the transition position between the first part 31 and the second part 32, and the boss edge 5 has a plurality of air extraction holes 322 along its own circumference. In addition, a first groove 326 is formed on the edge of the second part 32 to form an L-shaped step, and a plurality of air extraction holes 322 are also formed in the first groove 326 along its own length.

[0049] By setting the air extraction hole 322 on the edge of the boss and in the first groove 326, the foam sheet or film can be centrally fixed at the transition position between the second part 32 and the first part 31 and at the edge of the second part 32 away from the first part 31. Compared with opening several air extraction holes 322 for limiting, the negative pressure effect generated in the same extraction state will be better, reducing the possibility of displacement of the installed foam sheet or film, and further improving the molding quality of the subsequent shoe sole.

[0050] Example 4: Reference Figure 8 The difference from Embodiment 1 is that, for the second part 32 which does not have an air extraction hole 322, when limiting the diaphragm, if it is limited only by the limiting part 33, it takes a certain amount of time to smooth the diaphragm. Therefore, in order to improve the smoothing effect of the diaphragm.

[0051] In this embodiment, the second part 32 is provided with a plurality of film-clamping pins 7 along its own circumference. The film-clamping pins 7 can be disposed on the surface of the second part 32 away from the first part 31. At this time, the film-clamping pins 7 are vertically disposed relative to the surface of the second part 32. Since the film-clamping pins 7 have a certain length, they can be recessed into the surface of the second part 32 away from the first part 31 to form a groove. Correspondingly, refer to Figure 9 A second groove 333 can be provided on the inner surface of the limiting part 33 to correspond to the film-clamping needle 7.

[0052] It should be noted that, as well as Figure 10 As shown, the film-clamping needle 7 is positioned on the outer peripheral wall of the second part 32. At this time, the outer surface of the second part 32 is recessed to form a groove. The above two methods can be used individually or in combination, depending on the specific requirements.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A steam forming mold for shoe soles, characterized in that: It includes an upper mold (1) and a lower mold (2) arranged opposite to each other, and a middle mold (3) disposed between the two. The middle mold (3) includes a first part (31) disposed in the middle, two second parts (32) respectively disposed on the upper and lower sides of the first part (31), and a limiting part (33) detachably connected to the second part (32). A limiting gap (331) is formed between the outer peripheral wall of the limiting part (33) and the inner peripheral wall of the second part (32) to limit the foamed sheet and / or film.

2. The shoe sole steam forming mold according to claim 1, wherein: The first part (31) is provided with an exhaust hole.

3. The shoe sole steam forming mold according to claim 1, wherein: The limiting part (33) is located at the toe of the shoe and is provided as an opening or as a limiting ring.

4. The shoe sole steam forming mold according to claim 1, wherein: The limiting part (33) protrudes from the edge away from the first part (31) with a limiting block (332). The limiting block (332) is arranged at intervals along the perimeter of the limiting part (33). The surfaces of the two second parts (32) that are far apart from each other are provided with slots (325) for the limiting block (332) to be inserted.

5. The shoe sole steam forming mold according to claim 1, characterized in that: The inner surface of the second part (32) is provided with a plurality of air extraction holes (322). The second part (32) is hollow. The second part (32) is provided with an air extraction end (323) so as to extract air and make the second part (32) negative pressure.

6. The shoe sole steam forming mold of claim 1, wherein: The second part (32) is recessed to form a limiting groove (321), so that the foamed sheet or film can be inserted into the limiting groove (321) through the limiting part (33), and the inner peripheral wall of the limiting part (33) is flush with the inner peripheral wall of the first part (31).

7. The shoe sole steam forming mold according to claim 1, wherein: The second part (32) has several film-clamping needles (7) arranged along its own circumference.

8. The shoe sole steam forming mold of claim 1, wherein: A boss edge (5) is formed at the transition position between the first part (31) and the second part (32), and the boss edge (5) has a plurality of air extraction holes (322) along its own circumference.

9. A shoe sole steam forming mold according to claim 8, characterized in that: The second part (32) has a first groove (326) on its edge to form an L-shaped step, and a number of air extraction holes (322) are also provided in the first groove (326).

10. A shoe sole, characterized in that, From the inside out, it includes a first damping part (6) composed of foamed particles, a second damping part (61) composed of foamed sheets, and a coating layer (62) covered by a membrane on the outer surface of the second damping part (61). The foamed particles, foamed sheets and membrane are integrally formed by steam.

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