Sole manufacturing method and sole mold

Abstract

The present application relates to the technical field of shoe production, and provides a sole manufacturing method, comprising the steps of: S1, preparing a film; S2, mounting the film; S3, selecting a corresponding sole film bonding manner on the basis of a sole forming state, wherein for a foamed blank formed by foaming, sole film bonding manner I is selected, which comprises: S31, mounting the foamed blank in a mold cavity, and closing the mold cavity; S32, extracting air between the foamed blank and the film by another negative pressure, wherein a negative pressure value between the foamed blank and the film is less than a negative pressure value between the mold cavity and the film, and a pressure difference is formed; and S33, heating a sole mold to melt a bonding layer to bond and fix the film and the foamed blank; S4, performing cooling shaping; and S5, performing trimming shaping. On this basis, the film can tightly cover the outer surface of the sole once the sole is made, such that the forming quality of the sole is improved. In addition, further provided is a sole mold applied to the sole manufacturing method.

Description

A sole manufacturing method and sole mold Technical Field

[0001] The present application relates to the technical field of footwear production, and in particular to a sole manufacturing method and a sole mold. Background Art

[0002] Foam soles refer to soles made of materials such as EVA, TPU or PVC through a foaming process. They have the advantages of low density, good elasticity and good processing performance, and are widely used in the field of footwear materials.

[0003] Because foam soles are made of multiple foam particles, they are prone to peeling over time or when scratched by foreign objects. Therefore, after the foam soles are finished, a film is typically attached to the outer edge of the sole to prevent the foam particles from peeling. However, the outer surface of the foam soles produced through the foaming process can be uneven. When the film is attached to the outer edge of the sole, the fit between the film and the foam sole is poor, and molding defects such as bubbles may occur, affecting the molding quality of the soles, which needs to be improved.

[0004] Summary of the Invention

[0005] Based on this, the present application provides a sole manufacturing method and a sole mold.

[0006] In the first aspect, the present application provides a method for manufacturing a sole using the following technical solutions:

[0007] A method for manufacturing a sole comprises the following steps:

[0008] Step S1, preparing a film; an adhesive layer is provided on the surface of the film;

[0009] Step S2, film installation: the film is fixed to the sole mold, the film is preheated, and the film is adsorbed on the inner wall of the mold cavity of the sole mold by negative pressure;

[0010] Step S3, selecting a corresponding shoe film bonding method according to the sole forming state;

[0011] For the foamed molded body, select the shoe membrane bonding method 1, including:

[0012] S31, installing the foamed embryo into the mold cavity and closing the mold cavity;

[0013] S32, extracting the gas between the foamed embryo and the film by another negative pressure;

[0014] S33, heating the sole mold to melt the adhesive layer so that the film and the foamed body are bonded and fixed;

[0015] In addition, for foaming particles that have not yet started to foam, choose the second shoe film bonding method, including:

[0016] S34, cutting the bottom of the film;

[0017] S35, closing the mold cavity, filling the mold cavity with foaming particles, and closing the negative pressure acting on the film;

[0018] S36, adding steam between the foaming particles and the film, so that the foaming particles are foamed and formed and adhere to the film;

[0019] Step S4, cooling and shaping;

[0020] Step S5: trimming and shaping.

[0021] By adopting the above technical solution, the film is preheated and tightly adhered to the inner wall of the mold cavity by using negative pressure, and then the corresponding shoe film bonding method is selected according to the actual production situation of the sole, which helps to improve the efficiency of the film wrapping operation; and by installing the foamed embryo or foamed material particles inside the closed mold cavity, the tight bonding between the foamed embryo and the film, or the direct foaming molding of the foamed material particles, can improve the fitting flatness between the film and the foamed body, reduce the presence of molding defects such as bubbles, and improve the molding quality of the sole; finally, the sole mold and the sole are cooled and shaped, and the sole is taken out and trimmed and shaped to produce a finished sole.

[0022] Among them, in the shoe membrane bonding method of the foaming embryo and the film, after the prefabricated foaming embryo is placed inside the mold cavity, the mold cavity is closed and the mold cavity is vacuumed to form a negative pressure, which can extract the gas between the foaming embryo and the film. By setting the negative pressure value between the foaming embryo and the film to be less than the negative pressure value between the mold cavity and the film, a pressure difference can be formed between the two, thereby forcing the film to adhere closely to the inner wall of the mold cavity. It can be understood that compared with before step S32, the pressure difference between the inside and outside of the film is reduced after the foaming embryo and the film are vacuumed. While ensuring that the film is closely attached to the inner wall of the mold cavity, it can reduce the situation where the film is affected by the pressure difference and partially extends into the negative pressure hole, which is convenient for the subsequent demolding and trimming of the finished shoe sole.

[0023] Optionally, for the foamed body formed by foaming, the outer surface of the foamed body has exhaust lines.

[0024] By adopting the above-mentioned technical solution, after the foamed body is placed in the mold cavity and pressed against the film, a vacuum is drawn between the foamed body and the film, and the exhaust lines arranged on the outer surface of the foamed body can serve as exhaust channels to facilitate the discharge of gas between the foamed body and the film, thereby reducing the presence of molding defects such as bubbles.

[0025] Optionally, for the foamed embryo body for foam molding, the size of the foamed embryo body is larger than the size of the mold cavity, and the difference between the two is 1-2 cm.

[0026] By adopting the above-mentioned technical solution, by selecting a foam body with a size larger than the mold cavity size, squeezing the foam body and placing it inside the mold cavity, the foam body can be pressed against the inner wall of the film, reducing the residual gas between the two; then, by vacuuming between the upper mold and the foam body, the gas between the foam body and the film can be discharged through the internal pores of the foam body together with the gas in the pores. At this time, the foam body can shrink as a whole and become denser, while maintaining close contact with the film. After the mold cavity is subsequently heated, the foam body and the film can be tightly bonded, thereby improving the molding quality of the sole.

[0027] In the second aspect, the present application provides a sole mold that adopts the following technical solution:

[0028] A sole mold comprises an upper mold, a middle mold, a lower mold and an insulation mold which are arranged in sequence. The side surface of the lower mold is provided with a mold cavity for sole molding, and the side surface of the upper mold is fixed with a punch. In the mold closing state, the punch is located inside the mold cavity; the inner wall of the mold cavity is provided with a plurality of first negative pressure holes which pass through the outer side surface of the lower mold, and the side surface of the punch is provided with a plurality of second negative pressure holes which pass through the outer side surface of the upper mold; the insulation mold comprises a vacuum bottom mold for fixing the lower mold and an insulation layer which is arranged on each inner side wall of the vacuum bottom mold, and all the insulation layers are jointly covered on the outer side surface of the lower mold; a vacuum gap for heat insulation is formed between the vacuum bottom mold and the lower mold, and a vacuum port which is connected to the vacuum gap is provided on the outer wall of the vacuum bottom mold, and the vacuum port is used to cooperate with the first vacuum pumping device of the machine base to form negative pressure; an inner concave chamber is provided on the side of the upper mold away from the punch, and the inner concave chamber is used to cooperate with the second vacuum pumping device of the machine top seat to form negative pressure; each second negative pressure hole is respectively connected to the inner concave chamber.

[0029] By adopting the above-mentioned technical scheme, when the sole mold of the present application is used, the film is placed on the surface of the mold cavity and pressed by the middle mold, and a vacuum device is used to evacuate the inside of the vacuum port to form a negative pressure. The air inside the mold cavity can enter the vacuum gap through the first negative pressure hole and be extracted from the vacuum port, so that the film is extended and deformed and stably adsorbed on the inner wall of the mold cavity; the setting of the heat-insulating mold can reduce the heat exchange between the lower mold and the outside air when the lower mold is heated and heated, and can play a role in heat insulation and heat preservation to ensure the molding quality of the sole. Secondly, the foaming embryo is placed inside the mold cavity and the film is pressed tightly, the upper mold and the lower mold are combined and the foaming embryo is pressed tightly, and a vacuum device is used to evacuate the inside of the concave cavity to form a negative pressure. The air between the foaming material and the film can enter the concave cavity through the second negative pressure hole and be extracted from the concave cavity, so that the film is closely attached to the foaming material. After the sole mold is heated, the film and the foaming material can be closely bonded, thereby making the prepared sole have good molding quality.

[0030] Optionally, a mating structure for lateral positioning is provided between the lower mold and the vacuum bottom mold. When the lower mold is fixed to the vacuum bottom mold, there is a first gap between the lower mold and the insulation layer, and a second gap between the lower mold and the vacuum bottom mold. The first gap and the second gap together form a vacuum gap; the end of the first negative pressure hole away from the mold cavity is connected to the first gap or the second gap.

[0031] By adopting the above-mentioned technical solution, when the lower mold is fixed to the vacuum bottom mold, the accurate positioning between the lower mold and the vacuum bottom mold is maintained by the plug-in structure, so that a vacuum gap can be formed between the lower mold and the insulation layer, and between the lower mold and the vacuum bottom mold; by connecting the first negative pressure hole to the first gap or the second gap, when controlling the operation of the first vacuum pumping device to vacuum the vacuum gap, the air inside the mold cavity can enter the first gap through the first negative pressure hole, and then pass through the second gap and leave from the vacuum port. In this process, the air movement distance is extended, which can reduce heat loss and further improve the thermal insulation effect of the insulation mold.

[0032] Optionally, an outer shell is detachably mounted on the bottom surface of the vacuum bottom mold, a fixed cover of the outer shell is arranged at the vacuum port, and a connecting hole is provided at the end of the outer shell away from the vacuum bottom mold; an elastic core valve for maintaining negative pressure is provided between the outer shell and the vacuum bottom mold, the elastic core valve includes a sealing part, a deformation part integrally formed on the outer peripheral side of the sealing part, and an installation part integrally formed on the outer peripheral side of the deformation part, and the installation part is clamped and fixed between the outer shell and the vacuum bottom mold; the sealing part is normally sealed in the connecting hole, and when the first vacuum pumping device is operating, the deformation part is deformed in a direction away from the lower mold and forces the sealing part to leave the connecting hole.

[0033] By adopting the above-mentioned technical solution, when the first vacuuming device operates to draw a vacuum from the vacuum gap, the negative pressure suction generated by the first vacuuming device can force the deformable portion to deform away from the lower mold, thereby causing the blocking portion to move away from the connecting hole, thereby opening the connecting hole and allowing internal air to smoothly escape the vacuum gap through the connecting hole. After the first vacuuming device has operated for a period of time and the film has been firmly adsorbed to the inner wall of the mold cavity, the first vacuuming device can be turned off. At this time, the deformable portion can reset its deformation and re-seal the connecting hole, thereby maintaining the negative pressure. Compared to the first vacuuming device operating continuously to draw a vacuum, this arrangement can further reduce heat loss from the lower mold, thus providing energy-saving advantages.

[0034] Optionally, the plug-in structure includes a plug-in boss arranged on the lower mold and a plug-in groove opened on the vacuum bottom mold, and the plug-in boss is plugged and matched with the plug-in groove; a reset spring is provided inside the plug-in groove, and a connecting hole connected to the plug-in groove is provided on the bottom surface of the vacuum bottom mold, and a connecting bolt is provided inside the connecting hole, and the connecting bolt is passed through the reset spring and fixed to the plug-in boss; in the initial state, the bolt end of the connecting bolt abuts against the inner end wall of the connecting hole, and a gap is maintained between the lower mold and the vacuum bottom mold; an inclined groove is provided on the outer side surface of the vacuum bottom mold, and a limiting slider is slidably installed inside the inclined groove, and the limiting slider slides downward to the limit position under normal circumstances; the inner side surface of the limiting slider is provided with a first tooth-shaped portion, and the side surface of the plug-in boss is provided with a second tooth-shaped portion matched with the first tooth-shaped portion, and when the plug-in boss moves downward and abuts against the inner end wall of the plug-in groove, the first tooth-shaped portion and the second tooth-shaped portion cooperate to limit.

[0035] By adopting the above-mentioned technical solution, when the lower mold is fixed to the vacuum bottom mold, the plug-in boss is inserted into the plug-in groove, which can achieve accurate positioning between the lower mold and the vacuum bottom mold; the connecting bolt is passed through the connecting hole and connected to the plug-in boss, forcing the plug-in boss to move downward and abut against the inner end wall of the plug-in groove. At this time, the lower mold can match and abut against the vacuum bottom mold to form a sealed vacuum gap, and the vacuum gap can be kept stable by utilizing the limiting cooperation between the first tooth-shaped portion and the second tooth-shaped portion. After the sole is foamed and formed, by forcing the limiting slider to move outward so that the first tooth-shaped portion is separated from the second tooth-shaped portion, the plug-in boss can move in the direction away from the vacuum bottom mold under the elastic force of the reset spring. At this time, the lower mold and the vacuum bottom mold are separated from each other, and the outside air can flow into the interior of the vacuum bottom mold through the gap between the lower mold and the vacuum bottom mold, thereby eliminating the negative pressure suction of the first negative pressure hole, so as to facilitate the subsequent demolding operation of the sole.

[0036] Optionally, multiple support plates are provided inside the second gap, and the support plates are fixed to the bottom surface of the lower mold or the inner bottom surface of the vacuum bottom mold. When the lower mold is fixed to the vacuum bottom mold, the support plates correspondingly rest against the inner bottom surface of the vacuum bottom mold or the bottom surface of the lower mold; there are air paths for air to pass through between adjacent support plates.

[0037] By adopting the above-mentioned technical solution, the setting of the support plate can support the lower mold when the lower mold is fixed to the vacuum bottom mold, reducing the occurrence of local deformation of the lower mold due to being in a suspended state for a long time during the sole foaming molding process, which is conducive to maintaining a good service life of the lower mold.

[0038] Optionally, the support plate is provided with a negative pressure port for gas to pass through, and each negative pressure port is installed with a Tesla valve structure.

[0039] By adopting the above technical solution, when the first vacuuming device is in operation, the air inside the mold cavity enters the vacuum gap and can normally pass through the Tesla valve structure and be extracted from the vacuum port, which is conducive to the normal adsorption of the film to the inner wall of the mold cavity. After the film is firmly adsorbed to the inner wall of the mold cavity, the air will be severely hindered when it returns through the Tesla valve structure. At this time, controlling the intermittent operation of the first vacuuming device can ensure that each first negative pressure hole has a negative pressure that can firmly adsorb the film, which also has the advantage of energy saving. Moreover, after the sole is foamed and formed, the first vacuuming device is turned off, and during the cooling stage, the air can slowly return to the first negative pressure hole through the Tesla valve structure, thereby facilitating the subsequent demolding of the sole.

[0040] Optionally, a flow path system is provided inside the lower mold, and the flow path system is arranged around the outer circumference of the mold cavity, and the two ports of the flow path system are respectively connected to the bottom surface of the lower mold; two plug-in pipes are fixed to the inner bottom surface of the vacuum bottom mold, and the outer circumference of each plug-in pipe is fixed with a sealing gasket. When the lower mold is fixed to the vacuum bottom mold, the two plug-in pipes are respectively inserted into the two ports of the flow path system; two connecting passages are provided on the outer side of the vacuum bottom mold, and the two connecting passages are respectively connected to the two plug-in pipes.

[0041] By adopting the above-mentioned technical solution, when the lower mold is fixed to the vacuum bottom mold, the two connecting pipes can be respectively inserted into the two ports of the flow system. By introducing steam or cooling water or other media into one of the connecting passages, the medium can flow unidirectionally in the flow system, thereby quickly heating or cooling the system while reducing the blockage of the medium inside the flow system, thereby ensuring the normal use of the sole mold.

[0042] In summary, this application includes at least one of the following beneficial technical effects:

[0043] 1. By installing foaming bodies or foaming pellets in different molding states inside a closed mold cavity, the foaming body and the film are tightly bonded, or the foaming pellets are directly foamed to improve the flatness of the fit between the film and the foam body, and reduce the presence of molding defects such as bubbles;

[0044] 2. By setting the negative pressure between the foamed body and the film to be lower than the negative pressure between the mold cavity and the film, it is possible to ensure that the film is tightly attached to the inner wall of the mold cavity while reducing the pressure difference on the film and reducing the situation where the film partially extends into the negative pressure hole, thereby facilitating the subsequent demolding and trimming of the molded sole. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic diagram of the structure of the film placed on the surface of the mold cavity in Example 1;

[0046] FIG2 is a schematic diagram of the structure of the film when negative pressure is adsorbed on the inner wall of the mold cavity in Example 1;

[0047] FIG3 is a schematic diagram of the structure of the film after punching and cutting in Example 1;

[0048] FIG4 is a schematic diagram of the overall structure of the sole mold after the mold cavity is closed in Example 1;

[0049] FIG5 is a schematic diagram of the overall structure of the sole mold after the mold cavity is closed in Example 2;

[0050] FIG6 is an exploded view of the sole mold in Example 3;

[0051] FIG7 is a schematic diagram of the overall structure of the sole mold in Example 3;

[0052] FIG8 is a partial cross-sectional view of the lower mold in Example 3, mainly showing the specific structure of the flow path system;

[0053] FIG9 is a schematic structural diagram of the vacuum bottom mold in Example 3;

[0054] 10 is a schematic diagram of the overall structure of the sole mold after the mold cavity is closed in Example 4;

[0055] Figure 11 is a schematic structural diagram of the vacuum bottom mold in Example 5;

[0056] FIG12 is a schematic structural diagram of the vacuum bottom mold in Example 6;

[0057] 13 is a partial structural diagram of the vacuum port and the first vacuum hole position when the vacuum bottom mold is installed on the machine base in Example 7;

[0058] 14 is a partial cross-sectional view of the mating structure position of the lower mold and the vacuum bottom mold in Example 7;

[0059] FIG15 is an enlarged view of point A in FIG14 .

[0060] Explanation of reference numerals: 1. film; 11. adhesive layer; 2. foaming body; 3. foaming pellets; 4. upper mold; 41. convex mold; 42. feed hole; 43. second negative pressure hole; 44. inner concave cavity; 5. middle mold; 51. through groove; 6. lower mold; 61. mold cavity; 62. first negative pressure hole; 63. steam hole; 64. extension portion; 65. plug-in boss; 651. second tooth-shaped portion; 66. flow path system; 7. heat insulation mold; 71. vacuum bottom mold; 711. plug-in groove; 712. vacuum port; 713. communication path; 714. inner concave portion; 715. inner hook groove; 716. return spring; 717. Connecting hole; 718, inclined slide groove; 72, insulation layer; 73, vacuum gap; 731, first gap; 732, second gap; 74, plug-in pipe; 741, sealing gasket; 75, support plate; 751, negative pressure port; 752, Tesla valve structure; 76, outer shell; 761, hook portion; 762, connecting hole; 77, elastic core valve; 771, sealing portion; 772, deformation portion; 773, mounting portion; 78, connecting bolt; 79, limiting slider; 791, first tooth-shaped portion; 792, handle portion; 8, machine base; 81, first vacuum hole; 9, machine top seat; 91, second vacuum hole. DETAILED DESCRIPTION

[0061] The present application is further described in detail below with reference to Figures 1-15.

[0062] Example 1

[0063] The embodiment of the present application discloses a method for manufacturing a sole.

[0064] First of all, it should be noted that the preparation and processing of the sole is usually carried out inside the sole mold; the existing sole mold includes an upper mold 4, a middle mold 5 and a lower mold 6. The side of the lower mold 6 is provided with a mold cavity 61 for sole molding, and a punch 41 is fixed to the side of the upper mold 4. In the closed mold state, the upper mold 4 covers the lower mold 6, and the punch 41 can be located inside the mold cavity 61.

[0065] A method for manufacturing a shoe sole specifically comprises the following steps:

[0066] Step S1, preparing film 1; referring to FIG1 , a sole mold is selected, and a film 1 of corresponding size is punched out according to the size of the sole mold; in this embodiment, the film 1 is rectangular in shape, so as to completely cover the mold cavity 61 of the lower mold 6; and a layer of TPU foam colloid is applied to the surface of the film 1 using a spray device. After the TPU foam colloid solidifies, an adhesive layer 11 is formed; the thickness of the adhesive layer 11 is 5-10 threads, preferably 8 threads in this embodiment. It should be noted that the order of punching and forming the film 1 and coating the film 1 with TPU foam colloid can be reversed.

[0067] Step S2, film 1 installation; first, the film 1 is placed on the surface of the mold cavity 61 of the lower mold 6, and the film 1 needs to completely cover the surface of the mold cavity 61; the middle mold 5 is turned over so that it is pressed against the film 1 to press and fix the film 1, and at this time a closed space is formed between the film 1 and the mold cavity 61.

[0068] Secondly, referring to Figure 2, the film 1 of the present application is made of TPU material. The film 1 is heated by an irradiation lamp or a hot drying device that can provide high-temperature heat, so that the film 1 has good ductility after being softened by heat; the preheating temperature of the film 1 is 110°C-200°C, and the time is 10s-30s. In this embodiment, the preferred preheating temperature is 160°C and the time is 20s. The selection of TPU material can make the film 1 have good elasticity and ductility, which is conducive to the subsequent use of negative pressure to adsorb the film 1 to the inner wall of the mold cavity 61, reduce the wrinkling phenomenon of the film 1 itself, and reduce the molding defects after the sole is made.

[0069] Finally, the lower mold 6 is provided with a plurality of first negative pressure holes 62, and the external first vacuum pumping device is connected to each first negative pressure hole 62, and the operation of the first vacuum pumping device is controlled to extract the gas in the enclosed space through the first negative pressure holes 62. The ductile film 1 can extend inward and adhere tightly to the inner wall of the mold cavity 61 under the action of the negative pressure suction force.

[0070] Step S3, selecting a corresponding shoe film bonding method according to the sole forming state;

[0071] In this embodiment, the foaming particles 3 that have not yet started foaming are used to process and prepare the sole, and the shoe film bonding method 2 is selected, which specifically includes the following steps.

[0072] S34, referring to Figure 3, use a cutting device to punch and cut the film 1, cut off the part of the film 1 attached to the inner bottom wall of the mold cavity 61, and only retain the part of the film 1 attached to the inner peripheral wall of the mold cavity 61; since the inner peripheral wall of the mold cavity 61 is also provided with a first negative pressure hole 62, the remaining part of the film 1 can still be tightly attached to the inner peripheral wall of the mold cavity 61.

[0073] Referring to Figure 4 , the upper mold 4 is placed over the lower mold 6 to close the mold cavity 61. The upper mold 4 and the lower mold 6 need to be locked together; a sealed foaming space is now formed between the upper mold 4 and the film 1. The upper mold 4 has a feed hole 42. By connecting the pelletizing device to the feed hole 42, the foaming pellets 3 are pumped into the foaming space until the foaming pellets 3 are tightly filled. The first vacuum device is then closed.

[0074] S36: The lower mold 6 is provided with a steam hole 63 connected to the inner bottom wall of the mold cavity 61. A steam device externally connected to the steam hole 63 is used to input steam into the foaming space. The steam pressure here is 3-5 kg, and the molding time is 20-40 seconds. In this embodiment, the steam pressure is preferably 4 kg, and the molding time is 30 seconds. The foaming particles 3 are heated by the steam and expand. Adjacent foaming particles 3 are cross-linked with each other. Moreover, the adhesive layer 11 is melted by the heat. The expanded foaming particles 3 can also cross-link with the film 1 through the adhesive layer 11, thereby producing a shoe sole.

[0075] It should be noted that the gas inside the foaming space and the steam introduced can leave the foaming space through the feed hole 42 during the foaming process, so that after the shoe membrane is bonded, there are fewer molding defects such as bubbles between the foaming embryo 2 and the film 1, thereby improving the molding quality of the sole.

[0076] Step S4, cooling and shaping: cooling the sole mold to lower the temperature of the sole and then solidify it into shape.

[0077] Step S5, trimming and shaping: The first vacuum device is turned off, the sole is removed from the mold cavity 61, and the excess film 1 is trimmed to obtain a formed sole. The sole can be directly bonded to the upper and used as an outsole, or the sole can be used as a midsole and a layer of outsole bonded to the bottom to form the entire sole.

[0078] The implementation principle of a sole manufacturing method in the embodiment of the present application is as follows:

[0079] By using steam to foam and expand the foaming particles 3 in a closed foaming space, each foaming particle 3 can be tightly attached to the film 1 and the two can be cross-linked with each other, which is not only conducive to the rapid preparation and molding of the sole, but also can make the connection between the foaming particles 3 and the film 1 tighter, greatly reducing the possibility of accidental detachment or peeling of the film 1 during subsequent use, so that the sole has a good service life.

[0080] Example 2

[0081] The embodiment of the present application also discloses a method for manufacturing a sole.

[0082] A method for making a sole, wherein the remaining steps are basically the same as those in Example 1 and are not described in detail here; the difference from Example 1 is that this embodiment uses a foamed embryo 2 that has been foamed and formed to prepare the sole, and selects the shoe membrane bonding method 1, which specifically includes the following steps.

[0083] S31, using a foaming molding device, pre-prepared a foamed body 2. In this embodiment, the foamed body 2 is foamed and molded from TPU material. The foaming mold is then modified to allow the outer surface of the foamed body 2 to naturally form concave venting lines during molding. Then, referring to Figure 5, the foamed body 2 is placed within the mold cavity 61. The size of the foamed body 2 selected here should be larger than the size of the mold cavity 61 by 1-2 cm. This allows the foamed body 2 to be squeezed and deformed and tightly adhere to the inner side of the film 1 after placement within the mold cavity 61.

[0084] S32, first, cover the upper mold 4 on the lower mold 6 to close the mold cavity 61, and the upper mold 4 needs to be locked with the lower mold 6; at this time, the punch 41 can force the foaming embryo 2 to be pressed tightly against the film 1, thereby forming a closed bonding space between the upper mold 4 and the mold cavity 61.

[0085] Secondly, the upper mold 4 has a second negative pressure hole 43. An external second vacuum pumping device is connected to the second negative pressure hole 43. Through the vacuum extraction of the second vacuum pumping device, the gas in the internal pores of the foam body 2 can be extracted, so that a negative pressure is formed in the bonding space, and the foam body 2 as a whole shrinks and becomes denser. Here, the vacuum pressure of the second vacuum pumping device is 1 kg, and the vacuuming time is 100s-300s. The vacuuming time in this embodiment is preferably 200s. The gas between the foam body 2 and the film 1 can also be extracted from the second negative pressure hole 43 through the exhaust lines, or extracted from the internal pores of the foam body 2 and from the second negative pressure hole 43. This greatly reduces the possibility of bubbles between the foam body 2 and the film 1 after molding, thereby improving the molding quality of the sole.

[0086] In this embodiment, the first vacuuming device can cease applying negative pressure when the second vacuuming device is operating. Alternatively, in another embodiment, the first vacuuming device can maintain negative pressure while the second vacuuming device is operating. In this case, the negative pressure within the bonding space is lower than that within the enclosed space, creating a pressure differential between the two spaces; this pressure differential is 1-2 kg, preferably 1 kg. This pressure differential forces the film 1 to adhere tightly to the interior of the mold cavity 61. It will be appreciated that after the second vacuuming device creates a negative pressure within the bonding space, the pressure differential between the inside and outside of the film 1 decreases, ensuring that the film 1 adheres tightly to the inner wall of the mold cavity 61 while minimizing the risk of partial extension of the film 1 into the negative pressure holes in the lower mold 6, facilitating subsequent demolding and trimming of the finished shoe sole.

[0087] The implementation principle of a sole manufacturing method in the embodiment of the present application is as follows:

[0088] The larger foamed body 2 is squeezed into the smaller mold cavity 61, and the gas between the foamed body 2 and the film 1 is extracted by vacuuming, which can greatly reduce the presence of bubbles inside the bonding space and improve the molding quality of the sole. Moreover, the foamed body 2 is made to shrink more densely by vacuuming, which is also conducive to improving the rebound ability of the sole, so that the sole has excellent performance and good market competitiveness.

[0089] Example 3

[0090] The embodiments of the present application also disclose a sole mold, which can be applied to the sole manufacturing method of embodiment 1 or embodiment 2 to facilitate the smooth molding of the sole.

[0091] Referring to Figure 6, a sole mold includes an upper mold 4, a middle mold 5, a lower mold 6, and a heat-insulating mold 7, which are arranged in sequence. A punch 41 is fixed to the side of the upper mold 4 near the lower mold 6, and the middle mold 5 is provided with a through-groove 51 for the punch 41 to pass through. A cavity 61 is provided on the side of the lower mold 6 near the upper mold 4, and the shape of the cavity 61 matches that of the punch 41. When the upper mold 4, the middle mold 5, and the lower mold 6 are combined, the punch 41 can pass through the through-groove 51 and enter the cavity 61, forming a closed space inside the cavity 61 for foaming the sole.

[0092] The side of the lower mold 6 facing away from the upper mold 4 is provided with a plurality of first negative pressure holes 62. Each first negative pressure hole 62 is connected to the inner wall of the mold cavity 61, thereby creating a negative pressure inside the mold cavity 61. The insulating mold 7 includes a vacuum bottom mold 71 and an insulating layer 72. The vacuum bottom mold 71 is made of an aluminum alloy. Referring to FIG7 , the vacuum bottom mold 71 is fixed to the side of the lower mold 6 facing away from the upper mold 4, and is spaced apart from the lower mold 6 to form a vacuum gap 73.

[0093] The thermal insulation layer 72 is made of a material with a low thermal conductivity coefficient, and the thermal insulation layer 72 is bonded and fixed to the inner walls of the vacuum bottom mold 71; when the vacuum bottom mold 71 is fixed to the lower mold 6, the thermal insulation layer 72 can be attached to the outer wall of the lower mold 6, which is used to reduce the heat exchange between the lower mold 6 and the outside air, thereby achieving the effect of heat preservation, and at the same time ensuring that the vacuum gap 73 is closed.

[0094] Returning to Figure 6, a plug-in structure for lateral positioning is provided between the lower mold 6 and the vacuum bottom mold 71. Specifically, extension portions 64 are provided on all four sides of the lower mold 6. Each extension portion 64 is integrally formed with the lower mold 6, and each extension portion 64 is located on the side of the lower mold 6 close to the upper mold 4; the plug-in structure includes a plug-in boss 65 and a plug-in groove 711 that is plugged in and adapted to the plug-in boss 65. The plug-in boss 65 is integrally formed on the side of the extension portion 64 away from the upper mold 4; there are two plug-in bosses 65, and the two plug-in bosses 65 are symmetrically arranged on two opposite sides of the lower mold 6.

[0095] The plug-in grooves 711 are opened on the side of the vacuum bottom mold 71 close to the upper mold 4. The number of the plug-in grooves 711 is equal to the number of the plug-in bosses 65. After the lower mold 6 is fixed to the vacuum bottom mold 71, the extension portion 64 can be against the vacuum bottom mold 71 to improve the sealing effect between the lower mold 6 and the vacuum bottom mold 71. At the same time, each plug-in boss 65 can be correspondingly inserted into each plug-in groove 71, thereby achieving the effect of accurately positioning the lower mold 6.

[0096] At the same time, referring to Figure 7, a vacuum port 712 is provided on the side of the vacuum bottom mold 71 away from the lower mold 6, and the vacuum port 712 passes through the inner side of the vacuum bottom mold 71 and is connected to the vacuum gap 73; when the lower mold 6 of the sole mold is in use, the vacuum bottom mold 71 will be installed on the machine base 8 of the molding equipment, and the machine base 8 is provided with a first vacuum hole 81, and the first vacuum hole 81 can be arranged opposite to the vacuum port 712; the molding equipment is provided with a first vacuum pumping device for connecting to the first vacuum hole 81. By controlling the operation of the first vacuum pumping device, the air inside the mold cavity 61 can be extracted in sequence through the first negative pressure hole 62, the vacuum gap 73, the vacuum port 712 and the first vacuum hole 81, so that a negative pressure is formed inside the mold cavity 61.

[0097] When performing foam molding of the sole, the film 1 is laid on the surface of the mold cavity 61 of the lower mold 6, and the middle mold 5 is used to press the film 1 against the lower mold 6. The film 1 is preheated to make it extend. Then the first vacuum device is controlled to operate. The first vacuum device extracts the air inside the mold cavity 61, so that the first negative pressure hole 62 forms a negative pressure and the film 1 is adsorbed on the inner wall of the mold cavity 61.

[0098] The side of the upper mold 4 away from the lower mold 6 is provided with an inner concave chamber 44; the male mold 41 and the upper mold 4 are jointly provided with a second negative pressure hole 43, and the number of the second negative pressure holes 43 is provided, and each second negative pressure hole 43 is respectively connected to the inner concave chamber 44. When in use, the upper mold 4 of the sole mold is installed on the machine top base 9 of the molding equipment. The machine top base 9 is provided with a second vacuum hole 91, which can be connected to the inner concave chamber 44; the molding equipment is provided with a second vacuum device for connecting to the second vacuum hole 91. By controlling the operation of the second vacuum device, the air inside the mold cavity 61 can be extracted through the second negative pressure hole 43, the inner concave chamber 44 and the second vacuum hole 91 in sequence.

[0099] During the foaming molding of the sole, after the film 1 is adsorbed on the inner wall of the mold cavity 61 by the negative pressure of the first negative pressure hole 62, the foaming material is filled into the mold cavity 61 and pressed against the film 1, the upper mold 4 and the lower mold 6 are closed, and the second vacuum device is controlled to operate to extract the air between the foaming material and the film 1, which is conducive to the close adhesion between the foaming material and the film 1 and improves the molding quality of the sole.

[0100] It should be noted here that the foaming material used in this embodiment can be foaming particles 3, or a foaming body 2 that is initially foamed and molded. When the foaming body 2 is used, micropores will be formed in the foaming body 2 during the initial foaming and molding to facilitate the discharge of air. At the same time, each second negative pressure hole 43 needs to be arranged around the outer edge of the punch 41 to ensure that the air between the foaming body 2 and the film 1 can be smoothly extracted through the gap between the foaming body 2 and the film 1 to ensure the molding quality.

[0101] Both the upper mold 4 and the lower mold 6 are equipped with a flow system 66 for steam heating or water cooling. In this embodiment, the lower mold 6 is manufactured by 3D printing, while the upper mold 4 and the punch 41 are also manufactured integrally by 3D printing. 3D printing allows for more flexible positioning of the flow system 66. Referring to Figure 8 , taking the lower mold 6 as an example, the flow system 66 of the lower mold 6 can be arranged around the periphery of the mold cavity 61 to facilitate rapid heating and cooling at various locations within the mold cavity 61. Both ports of the flow system 66 extend through the bottom surface of the lower mold 6 and can serve as the inlet and outlet of the medium, respectively.

[0102] Referring to Figure 9, two plug-in pipes 74 are fixed to the inner bottom surface of the vacuum bottom mold 71, and the outer peripheral surface of each plug-in pipe 74 is fixedly covered with a sealing gasket sleeve 741. When the lower mold 6 is fixed to the vacuum bottom mold 71, the two plug-in pipes 74 can be respectively inserted into the two ports of the flow system 66, and the setting of the sealing gasket sleeve 741 can improve the sealing performance between the plug-in pipe 74 and the port of the flow system 66.

[0103] Two connecting passages 713 are also provided on the outer side of the vacuum bottom mold 71, and the two connecting passages 713 are respectively connected to the two plug-in pipes 74; when the lower mold 6 is fixed to the vacuum bottom mold 71, by introducing steam or cooling water and other media into one of the connecting passages 713, the medium can enter the flow path system 66 in one direction and be discharged from the other connecting passage 713, which can reduce the situation where the medium is blocked inside the flow path system 66 while quickly heating or cooling, so as to ensure the normal use of the sole mold.

[0104] It should be noted that, for the sole manufacturing method of the foaming particles 3 that have not started to foam in Example 1, it is necessary to open multiple steam holes 63 at the bottom of the lower mold 6 and connect a steam device. The above structure is a conventional design in this field and will not be described in detail here.

[0105] The implementation principle of a sole mold in the embodiment of the present application is as follows:

[0106] When the sole mold of the present application is in use, a first vacuum device is used to draw vacuum to the inside of the vacuum port 712 to form a negative pressure. The air inside the mold cavity 61 can enter the vacuum gap 73 through the first negative pressure hole 62 and be drawn out by the vacuum port 712, so that the film 1 can be adsorbed on the inner wall of the mold cavity 61; the setting of the heat insulation layer 72 can weaken the heat exchange between the lower mold 6 and the outside air, thereby achieving a heat preservation effect, so that the internal temperature of the lower mold 6 and the heating set temperature are maintained within a small difference range to ensure the molding quality of the sole.

[0107] Example 4

[0108] The embodiment of the present application also discloses a sole mold.

[0109] Referring to Figure 10, the embodiment of the present application discloses a sole mold, and the remaining components are the same as those in Example 3, which will not be described in detail here. The difference from Example 3 is that the outer peripheral dimensions of the lower mold 6 in this embodiment are smaller than the inner dimensions of the vacuum bottom mold 71. After the lower mold 6 is fixed to the vacuum bottom mold 71 and lateral positioning is achieved through the plug-in structure, the lower mold 6 and the insulation layer 72 are spaced apart by a first gap 731, and the lower mold 6 and the vacuum bottom mold 71 are spaced apart by a second gap 732. The first gap 731 and the second gap 732 can together form the vacuum gap 73 described in Example 3. The end of some first negative pressure holes 62 away from the mold cavity 61 is connected to the first gap 731, while the end of the remaining first negative pressure holes 62 away from the mold cavity 61 is connected to the second gap 732.

[0110] When the lower mold 6 is fixed to the vacuum bottom mold 71, the first vacuum device is controlled to operate to vacuum the vacuum gap 73. The air inside the mold cavity 61 can enter the first gap 731 through the first negative pressure hole 62, and then pass through the second gap 732 and leave from the vacuum port 712. The moving distance of the air in the vacuum gap 73 is extended, which can reduce heat loss and further improve the thermal insulation effect of the insulation mold 7.

[0111] Example 5

[0112] The embodiment of the present application also discloses a sole mold.

[0113] Referring to Figure 11, a sole mold disclosed in an embodiment of the present application has other components that are the same as those in Example 3 or Example 4, and will not be described one by one here; the difference from Example 3 or Example 4 is that a plurality of support plates 75 are provided inside the second gap 732 in this embodiment, and the support plates 75 are fixed to the inner bottom surface of the vacuum bottom mold 71. When the lower mold 6 is fixedly installed on the vacuum bottom mold 71, the support plates 75 can be against the bottom surface of the lower mold 6, thereby playing an auxiliary supporting role for the lower mold 6, reducing the possibility of local deformation of the lower mold 6 during the sole foaming molding process.

[0114] It should be noted that the support plates 75 in this embodiment are arranged side by side so that air paths can be formed between adjacent support plates 75; each support plate 75 is provided with negative pressure ports 751 passing through both sides, so that air can flow smoothly in each air path through the negative pressure ports 751, and finally be drawn out from the vacuum port 712 by the first vacuum device.

[0115] In another feasible embodiment, the support plate 75 can be fixed to the bottom surface of the lower mold 6. When the lower mold 6 is fixedly installed on the vacuum bottom mold 71, the support plate 75 can correspond to the inner bottom surface of the vacuum bottom mold 71, and can also achieve auxiliary support for the lower mold 6, and is not limited to the method provided in this embodiment.

[0116] Example 6

[0117] The embodiment of the present application also discloses a sole mold, which is mainly used in the sole manufacturing method of Example 2 and is used to maintain the negative pressure of the first negative pressure hole 62 during the foaming molding process.

[0118] Referring to Figure 12, the embodiment of the present application discloses a sole mold. The remaining components are the same as those in Example 5 and will not be described in detail here. The difference from Example 5 is that each negative pressure port 751 in this embodiment is provided with a Tesla valve structure 752. The specific structure of the Tesla valve is well known to people, and the specific shape is shown in Figure 12. It should be noted that the Tesla valve structure 752 in this embodiment can allow the air in the vacuum gap 73 to pass smoothly when the first vacuum device is in operation. However, the reverse flow of air will be hindered. At this time, the first vacuum device only needs to operate intermittently to meet the negative pressure requirement of the first negative pressure hole 62, which has the advantage of energy saving. After the sole is foamed and formed, by controlling the first vacuum device to stop operating, the air can still slowly flow back to the first negative pressure hole 62 through the Tesla valve structure 752 during the cooling stage to facilitate the subsequent demolding operation of the sole.

[0119] Example 7

[0120] The embodiment of the present application also discloses a sole mold, which is mainly used in the sole manufacturing method of Example 2 and is used to maintain the negative pressure of the first negative pressure hole 62 during the foaming molding process.

[0121] Referring to Figure 13, a sole mold is disclosed in an embodiment of the present application, and the remaining components are the same as those in Example 3 or Example 4, and will not be described one by one here; the difference from Example 3 or Example 4 is that in this embodiment, the bottom surface of the vacuum bottom mold 71 is detachably installed with an outer shell 76, and the outer shell 76 can be fixedly covered on the vacuum port 712.

[0122] Specifically, an inner recess 714 is provided on the bottom surface of the vacuum bottom mold 71, and an inner side wall of the inner recess 714 is provided with an inner hook groove 715 extending circumferentially; an inner edge of the outer shell 76 is provided with an integrally formed hook portion 761. By partially embedding the outer shell 76 into the inner recess 714, the hook portion 761 rests against the inner wall of the inner recess 714 and undergoes elastic deformation. When the hook portion 761 and the inner hook groove 715 are in a position facing each other, the hook portion 761 can match and embed into the inner hook groove 715, thereby making the outer shell 76 firmly installed on the vacuum bottom mold 71.

[0123] A communication hole 762 is provided at one end of the outer shell 76, distal from the vacuum bottom mold 71. This hole 762 extends through the outer shell 76 and communicates with the vacuum port 712, allowing air to pass through. An elastic core valve 77 is sandwiched between the outer shell 76 and the inner recess 714. This valve allows air to pass through the communication hole 762 in only one direction and be extracted by the first vacuum device. This prevents air from flowing back into the vacuum gap 73, ensuring that the first negative pressure port 62 maintains a stable negative pressure even when the first vacuum device is closed.

[0124] The elastic core valve 77 is made of silicone material as a whole. The elastic core valve 77 includes a sealing portion 771, a deformation portion 772 and a mounting portion 773. The deformation portion 772 is integrally formed on the outer peripheral side of the sealing portion 771, and the mounting portion 773 is integrally formed on the outer peripheral side of the deformation portion 772; the mounting portion 773 is matched and arranged on the inner side of the outer shell 76. When the outer shell 76 is fixed to the inner recess 714 through the cooperation of the hook portion 761 and the inner hook groove 715, the outer shell 76 and the inner recess 714 can jointly clamp the mounting portion 773, thereby playing a role in fixing the elastic core valve 77.

[0125] The deformable portion 772 is disposed through the communicating hole 762 and is suspended relative to the outer shell 76, forming a deformation space between the two for the deformable portion 772 to deform. The blocking portion 771 is disposed at the end of the communicating hole 762 and normally blocks the communicating hole 762. When the first vacuuming device is activated, the elastic core valve 77 is subjected to negative pressure suction, which can cause the deformable portion 772 to deform toward the end of the communicating hole 762. At this time, the blocking portion 771 can leave the communicating hole 762, thereby smoothly extracting the air inside the vacuum gap 73 to form a negative pressure. It is understood that when the first vacuuming device stops, the deformable portion 772 can reset its deformation and drive the blocking portion 771 to re-seal the communicating hole 762, thereby maintaining the negative pressure inside the vacuum gap 73.

[0126] Furthermore, referring to Figure 14 , in this embodiment, a return spring 716 is embedded within the insertion groove 711. When the insertion boss 65 is inserted into the insertion groove 711, it abuts against the return spring 716. The bottom surface of the vacuum bottom mold 71 is provided with a connection hole 717 that communicates with the insertion groove 711. The connection hole 717 is a trapezoidal hole, and a connecting bolt 78 is disposed within the connection hole 717. The connecting bolt 78 passes through the return spring 716 and is secured to the insertion boss 65. In the initial state, the insertion boss 65 is moved outward by the elastic force of the return spring 716. The end of the connecting bolt 78 abuts against the inner end wall of the connection hole 717. At this time, a gap is maintained between the lower mold 6 and the vacuum bottom mold 71, allowing external air to enter the vacuum bottom mold 71 through the gap between the lower mold 6 and the vacuum bottom mold 71.

[0127] Referring to Figure 15, the outer side surface of the vacuum bottom mold 71 is also provided with an inclined slide groove 718, which is connected to the plug-in groove 711; a limiting slider 79 is slidably installed inside the inclined slide groove 718, and the inner side surface of the limiting slider 79 is provided with an integrally formed first tooth-shaped portion 791. In the initial state, the limiting slider 79 can move downward to the extreme position under the action of its own gravity. At this time, the first tooth-shaped portion 791 can be partially located inside the plug-in groove 711.

[0128] A second tooth-shaped portion 651 is provided on the side of the plug-in boss 65, and the shapes of the second tooth-shaped portion 651 and the first tooth-shaped portion 791 are adapted to each other. Referring to Figure 14, after the lower mold 6 is fixedly installed on the vacuum bottom mold 71, the lower mold 6 is forced to move toward the direction close to the vacuum bottom mold 71. The plug-in boss 65 can move downward and finally abut against the inner end wall of the plug-in groove 711. At this time, the first tooth-shaped portion 791 can cooperate with the second tooth-shaped portion 651 to limit the position, and the lower mold 6 can maintain a firm abutment against the vacuum bottom mold 71, thereby keeping the formed vacuum gap 73 stably sealed.

[0129] It should be noted that, in this embodiment, the top surface of the first tooth-shaped portion 791 is inclined relative to the horizontal direction, and the inclination angle is 30°-60°, so that when the plug-in boss 65 moves downward, it can automatically push open the limit slider 79, that is, it can automatically force the limit slider 79 to move outward; the bottom surface of the first tooth-shaped portion 791 remains parallel to the horizontal direction, and after the plug-in boss 65 matches and abuts against the inner end wall of the plug-in groove 711, the limit slider 79 can reset inward under the action of its own gravity, and the first tooth-shaped portion 791 can stably abut against the second tooth-shaped portion 651, thereby reducing the occurrence of accidental separation of the first tooth-shaped portion 791 and the second tooth-shaped portion 651.

[0130] In addition, the outer side surface of the limit slider 79 is provided with an integrally formed handle portion 792, which can facilitate the staff to move the limit slider 79; after the sole is foamed and formed, the staff holds the handle portion 792 and pulls the limit slider 79 outward, and the plug-in boss 65 can automatically return to the initial state under the elastic force of the reset spring 716. At this time, a gap is maintained between the lower mold 6 and the vacuum bottom mold 71, and external air can quickly flow into the first negative pressure hole 62, thereby eliminating the negative pressure suction force of the first negative pressure hole 62, and can also facilitate the subsequent demolding operation of the sole.

[0131] Finally, it should be noted that the improved solution in this embodiment is also applicable to the solution of Example 5 or Example 6, and is not limited to the method shown in this embodiment.

[0132] The above are preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for making a sole, characterized in that: The following steps are involved: Step S1, preparing a film (1); an adhesive layer (11) is provided on the surface of the film (1); Step S2, installing the film (1); fixing the film (1) to the sole mold, preheating the film (1), and adsorbing the film (1) to the inner wall of the mold cavity (61) of the sole mold by negative pressure; Step S3, selecting a corresponding shoe film bonding method according to the sole forming state; For the foamed embryo (2) that has been foamed, a shoe membrane bonding method 1 is selected, including: S31, installing the foamed embryo (2) inside the mold cavity (61), and closing the mold cavity (61); S32, extracting the gas between the foamed embryo (2) and the film (1) by another negative pressure; S33, heating the sole mold, melting the adhesive layer (11) so that the film (1) and the foamed embryo (2) are bonded and fixed; In addition, for the foaming particles (3) that have not started to foam, the shoe film bonding method 2 is selected, including: S34, cutting the bottom of the film (1); S35, closing the mold cavity (61), filling the mold cavity (61) with foaming particles (3), and closing the negative pressure acting on the film (1); S36, adding steam between the foaming particles (3) and the film (1), so that the foaming particles (3) are foamed and formed and bonded to the film (1); Step S4, cooling and shaping; Step S5: trimming and shaping.

2. The method for making a sole according to claim 1, characterized in that: For the foamed embryonic body (2) formed by foaming, the outer surface of the foamed embryonic body (2) has exhaust lines.

3. The sole manufacturing method according to claim 1, characterized in that: For the foamed embryo (2) formed by foaming, the size of the foamed embryo (2) is larger than the size of the mold cavity (61), and the difference between the two is 1-2 centimeters.

4. A sole mold, applied to the sole manufacturing method according to any one of claims 1 to 3, characterized in that: The invention comprises an upper mold (4), a middle mold (5), a lower mold (6) and a heat-insulating mold (7) which are arranged in sequence, wherein a mold cavity (61) for molding a shoe sole is provided on the side of the lower mold (6), a convex mold (41) is fixed on the side of the upper mold (4), and in a mold-closing state, the convex mold (41) is located inside the mold cavity (61); a plurality of first negative pressure holes (62) penetrating the outer side of the lower mold (6) are provided on the inner wall of the mold cavity (61), and a plurality of second negative pressure holes (43) penetrating the outer side of the upper mold (4) are provided on the side of the convex mold (41); The heat-insulating mold (7) comprises a vacuum bottom mold (71) for fixing the lower mold (6) and a heat-insulating layer (72) arranged on each inner side wall of the vacuum bottom mold (71), and all the heat-insulating layers (72) are arranged together on the outer side surface of the lower mold (6); a vacuum gap (73) for heat insulation and heat preservation is formed between the vacuum bottom mold (71) and the lower mold (6), and the vacuum bottom mold (71) The outer wall is provided with a vacuum port (712) connected to the vacuum gap (73), and the vacuum port (712) is used to cooperate with a first vacuum extraction device of the machine base (8) to form a negative pressure; A concave chamber (44) is provided on the side of the upper mold (4) away from the male mold (41), and the concave chamber (44) is used to cooperate with the second vacuum device of the machine top seat (9) to form negative pressure; each of the second negative pressure holes (43) is respectively connected to the concave chamber (44).

5. The sole mold according to claim 4, characterized in that: A mating structure for lateral positioning is provided between the lower mold (6) and the vacuum bottom mold (71); when the lower mold (6) is fixed to the vacuum bottom mold (71), a first gap (731) is provided between the lower mold (6) and the heat insulation layer (72); a second gap (732) is provided between the lower mold (6) and the vacuum bottom mold (71); the first gap (731) and the second gap (732) together form the vacuum gap (73); and the end of the first negative pressure hole (62) away from the mold cavity (61) is connected to the first gap (731) or the second gap (732).

6. The sole mold according to claim 5, characterized in that: The bottom surface of the vacuum bottom mold (71) is detachably mounted with an outer shell (76), the outer shell (76) is fixedly covered with a vacuum port (712), and a connecting hole (762) is provided at one end of the outer shell (76) away from the vacuum bottom mold (71); an elastic core valve (77) for maintaining negative pressure is provided between the outer shell (76) and the vacuum bottom mold (71), the elastic core valve (77) comprising a blocking portion (771), an outer portion of the blocking portion (771) and an outer portion of the sealing portion (771) formed integrally therewith. A deformable portion (772) is formed on the peripheral side of the deformable portion (772) and a mounting portion (773) is integrally formed on the peripheral side of the deformable portion (772), wherein the mounting portion (773) is clamped and fixed between the outer shell (76) and the vacuum bottom mold (71); the blocking portion (771) normally blocks the connecting hole (762), and when the first vacuum pumping device is in operation, the deformable portion (772) is deformed in a direction away from the lower mold (6) and forces the blocking portion (771) to leave the connecting hole (762).

7. The sole mold according to claim 6, characterized in that: The plug-in structure comprises a plug-in boss (65) arranged on the lower mold (6) and a plug-in groove (711) opened on the vacuum bottom mold (71), wherein the plug-in boss (65) is plugged and matched with the plug-in groove (711); a reset spring (716) is arranged inside the plug-in groove (711), and a connecting hole (717) connected to the plug-in groove (711) is arranged on the bottom surface of the vacuum bottom mold (71), and a connecting bolt (78) is arranged inside the connecting hole (717), and the connecting bolt (78) passes through the reset spring (716) and is fixed to the plug-in boss (65); in an initial state, the bolt end of the connecting bolt (78) abuts against the inner end wall of the connecting hole (717), and a gap is maintained between the lower mold (6) and the vacuum bottom mold (71); The outer side surface of the vacuum bottom mold (71) is provided with an inclined slide groove (718), and a limit slider (79) is slidably installed inside the inclined slide groove (718). The limit slider (79) slides downward to the limit position under normal conditions; the inner side surface of the limit slider (79) is provided with a first tooth-shaped portion (791), and the side surface of the plug-in boss (65) is provided with a second tooth-shaped portion (651) adapted to the first tooth-shaped portion (791). When the plug-in boss (65) moves downward and abuts against the plug-in groove (711), When the inner end wall is formed, the first tooth-shaped portion (791) cooperates with the second tooth-shaped portion (651) to limit the position.

8. The sole mold according to claim 5, characterized in that: A plurality of support plates (75) are provided inside the second gap (732), and the support plates (75) are fixed to the bottom surface of the lower mold (6) or the inner bottom surface of the vacuum bottom mold (71). When the lower mold (6) is fixed to the vacuum bottom mold (71), the support plates (75) correspondingly abut against the inner bottom surface of the vacuum bottom mold (71) or the bottom surface of the lower mold (6); and air passages for air to pass through are provided between adjacent support plates (75).

9. The sole mold according to claim 8, characterized in that: The support plate (75) is provided with negative pressure ports (751) for gas to pass through, and each negative pressure port (751) is installed with a Tesla valve structure (752).

10. The sole mold according to claim 4, characterized in that: The lower mold (6) is provided with a flow path system (66) inside, and the flow path system (66) is arranged around the outer circumference of the mold cavity (61), and the two ports of the flow path system (66) are respectively connected to the bottom surface of the lower mold (6); two plug-in pipes (74) are fixed to the inner bottom surface of the vacuum bottom mold (71), and the outer circumference of each plug-in pipe (74) is fixedly sleeved with a sealing gasket sleeve (741), and when the lower mold (6) is fixed to the vacuum bottom mold (71), the two plug-in pipes (74) are respectively correspondingly inserted into the two ports of the flow path system (66); the outer side surface of the vacuum bottom mold (71) is provided with two connecting passages (713), and the two connecting passages (713) are respectively connected to the two plug-in pipes (74).

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