Sole mold with heat insulation and heat preservation functions

Abstract

The utility model relates to the field of shoe mold design, and provides a heat insulation shoe sole mold which comprises a lower mold and a heat insulation mold, the lower mold is provided with a mold cavity for forming a shoe sole, and the inner wall of the mold cavity is provided with a plurality of first negative pressure holes penetrating through the outer side face of the lower mold; the heat insulation die comprises a vacuum bottom die for fixing the lower die and heat insulation layers arranged on the inner walls of the vacuum bottom die, and when the lower die is fixed to the vacuum bottom die, a vacuum gap for heat preservation and heat insulation is formed between the lower die and the vacuum bottom die; a plurality of supporting plates are arranged in the vacuum gap, the supporting plates are fixed to the bottom face of the lower die or the inner bottom wall of the vacuum bottom die, and when the lower die is fixed to the vacuum bottom die, the supporting plates correspondingly abut against the inner bottom wall of the vacuum bottom die or the bottom face of the lower die; an air channel for air to pass through is arranged between every two adjacent supporting plates. On the basis, the lower die can be supported after being fixed to the heat insulation die, and the possibility of local deformation and even cracking of the lower die is reduced.

Description

Technical Field

[0001] The present application relates to the field of shoe mold design, and in particular to a heat-insulating sole mold. Background Art

[0002] Sole molds are important tools for manufacturing soles in industrial production. They can be used to produce the desired sole products through injection molding, blow molding, extrusion, foaming and other methods.

[0003] The Chinese patent application publication number CN117584513A currently discloses a method for making a sole and the sole made therefrom. The sole includes a sole body and a film covering the outer surface of the sole body, and the two are tightly bonded. In a specific processing process, the film is laid on the surface of a lower mold, preheated, and then the thin plate is tightly adsorbed to the inner wall of the mold cavity of the lower mold by negative pressure adsorption. Secondly, foaming particles or a foamed foamed embryo are filled into the mold cavity, the mold cavity is closed, and then the air between the foaming material and the film is extracted by the negative pressure of the upper mold. The shoe mold is then heated to make the film tightly bonded to the foaming material, thereby making the sole.

[0004] Regarding the aforementioned technical solutions, the sole production process requires continuous vacuuming of the lower mold to create negative pressure. This vacuuming process continuously removes heat from the lower mold. Therefore, to mitigate heat loss, the lower mold is often placed inside an insulating mold to provide insulation. However, since the lower mold needs to be vacuumed to create negative pressure within the mold cavity, a vacuum gap exists between the lower mold and the insulating mold, leaving the lower mold suspended in the air. During the sole molding process, the suspended lower mold may experience local deformation or even cracking, impacting the service life of the sole mold and requiring further improvement. Utility Model Content

[0005] Based on this, the present application provides a heat-insulating sole mold, which can support the lower mold after the lower mold is fixed to the heat-insulating mold, thereby reducing the possibility of local deformation or even cracking of the lower mold.

[0006] The present application provides a heat-insulating sole mold that adopts the following technical solutions:

[0007] A heat-insulating sole mold comprises a lower mold and a heat-insulating mold, wherein the lower mold is provided with a mold cavity for molding the sole, and the inner wall of the mold cavity is provided with a plurality of first negative pressure holes penetrating the outer side surface of the lower mold;

[0008] The heat-insulating mold includes a vacuum bottom mold for fixing the lower mold and a heat-insulating layer provided on each inner wall of the vacuum bottom mold. When the lower mold is fixed to the vacuum bottom mold, a vacuum gap for heat insulation is formed between the lower mold and the vacuum bottom mold. A vacuum port connected to the vacuum gap is provided on the outer wall of the vacuum bottom mold. The vacuum port is used to cooperate with the first vacuum pumping device of the machine base to form negative pressure.

[0009] Multiple support plates are provided inside the vacuum gap, and the support plates are fixed to the bottom surface of the lower mold or the bottom wall of the vacuum bottom mold. When the lower mold is fixed to the vacuum bottom mold, the support plates are correspondingly against the bottom wall of the vacuum bottom mold or the bottom surface of the lower mold; there are air paths between adjacent support plates for air to pass through.

[0010] By adopting the above-mentioned technical solution, the present application fixes the lower mold on the vacuum bottom mold when performing foam molding of the sole, and a vacuum gap can be formed between the lower mold and the vacuum bottom mold. By controlling the operation of the first vacuum pumping device, the vacuum gap, the first negative pressure hole and the inside of the mold cavity can be smoothly vacuumed; the setting of the thermal insulation layer can reduce the heat exchange between the lower mold and the outside air when the lower mold is heated, so as to ensure the molding quality of the sole.

[0011] When the upper mold and the lower mold are closed and the sole is foamed, the upper mold always has a force acting on the lower mold. The setting of the support plate can support the lower mold during the sole molding process, reduce the possibility of local deformation or even cracking of the lower mold, reduce the additional economic losses of the mold repair operation, and maintain a good service life of the sole mold.

[0012] Optionally, both ends of the support plate are respectively pressed against the inner walls of the vacuum bottom mold on both sides, all the support plates are arranged at intervals along the extension direction of the vacuum bottom mold, and each support plate is provided with a negative pressure port for air to pass through.

[0013] By adopting the above-mentioned technical solution, by making the two ends of the support plate respectively rest against the inner walls on both sides of the vacuum bottom mold, each support plate can separate the vacuum gap to form an air path for air to pass through, and by setting a negative pressure vent to make adjacent air paths interconnected, the flow path of air inside the vacuum gap can be extended, the heat loss inside the lower mold can be reduced, and the effect of heat insulation can be achieved, so that the internal temperature of the lower mold and the heating set temperature are maintained within a small difference range to ensure the molding quality of the sole.

[0014] Optionally, the negative pressure port is equipped with a Tesla valve structure.

[0015] By adopting the above-mentioned technical solution, when the first vacuum pumping device operates to vacuum the vacuum gap, the air inside the mold cavity can enter the vacuum gap and pass through the Tesla valve structure normally 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 on the inner wall of the mold cavity, the air will be severely hindered when it flows back through the Tesla valve structure. At this time, controlling the intermittent operation of the first vacuum pumping device can make each first negative pressure hole have a negative pressure that firmly adsorbs the film, which has the advantage of energy saving. After the sole is foamed and formed, the first vacuum pumping device is turned off. During the cooling stage, the air can slowly flow back to the first negative pressure hole through the Tesla valve structure to facilitate the subsequent demolding operation of the sole.

[0016] Optionally, a sealing pad layer is bonded to the working surface of the support plate.

[0017] By adopting the above-mentioned technical solution, when the lower mold is fixedly installed on the vacuum bottom mold, the setting of the sealing pad layer enables flexible abutment between the support plate and the lower mold / vacuum bottom mold, which can reduce the collision and wear between the support plate and the lower mold / vacuum bottom mold, and maintain a good service life of the sole mold.

[0018] 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, a first gap is formed between the lower mold and the insulation layer, and a second gap is formed 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.

[0019] 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 flow path is extended, and the heat loss can also be reduced, thereby further improving the thermal insulation effect of the insulation mold.

[0020] Optionally, the plug-in structure includes a plug-in boss and a plug-in groove that are plugged and adapted to each other, the plug-in boss is arranged on the lower mold or the vacuum bottom mold, and the plug-in groove is correspondingly opened on the vacuum bottom mold or the lower mold.

[0021] By adopting the above technical solution, when the lower mold is fixed to the vacuum bottom mold, the plug-in protrusion is inserted into the plug-in groove, which can limit the relative position of the lower mold and the vacuum bottom mold to achieve accurate positioning between the lower mold and the vacuum bottom mold.

[0022] 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 wall of the vacuum bottom mold, and 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.

[0023] By adopting the above-mentioned technical solution, by arranging a flow path system surrounding the outer peripheral side of the mold cavity inside the lower mold, 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 path system. By introducing a medium such as steam or cooling water into one of the connecting passages, the medium can flow unidirectionally in the flow path system, thereby reducing the situation where the medium is blocked inside the flow path system while achieving rapid heating or cooling, thereby ensuring the normal use of the sole mold.

[0024] Optionally, a sealing gasket is bonded to the outer peripheral surface of the plug-in pipe.

[0025] By adopting the above technical solution, when the connecting pipe is inserted into the port of the flow path system, the provision of the sealing gasket can enhance the sealing effect between the connecting pipe and the flow path system, thereby reducing the possibility of medium leakage.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By providing a support plate, the upper mold always exerts a force on the lower mold when the upper mold and the lower mold are closed and the sole is foamed. The support plate can support the lower mold during the sole molding process, reducing the possibility of local deformation or even cracking of the lower mold;

[0028] 2. By placing the two ends of the support plates against the inner walls of the vacuum bottom mold, each support plate can separate the vacuum gap, extend the air flow path inside the vacuum gap, reduce heat loss inside the lower mold, and thus play a role in heat insulation;

[0029] 3. The setting of the sealing pad layer makes the support plate and the lower mold / vacuum bottom mold flexible, which can reduce the collision and wear between the support plate and the lower mold / vacuum bottom mold, and maintain a good service life of the sole mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is an exploded view of the upper mold, middle mold, lower mold and heat insulation mold in Example 1;

[0031] Figure 2 1 is a schematic diagram of the overall structure of the sole mold in Example 1;

[0032] Figure 3 Schematic diagram of the structure of the vacuum bottom mold in Example 1;

[0033] Figure 4 Schematic diagram of the structure of the vacuum bottom mold in Example 2;

[0034] Figure 5 Schematic diagram of the structure of the vacuum bottom mold in Example 3;

[0035] Figure 6 It is a structural schematic diagram of the vacuum bottom mold in Example 4.

[0036] Explanation of the accompanying drawings: 1. Upper mold; 11. Punch; 12. Second negative pressure hole; 13. Concave chamber; 2. Middle mold; 21. Through groove; 3. Lower mold; 31. Cavity; 32. First negative pressure hole; 33. Extension; 4. Insulation mold; 41. Vacuum bottom mold; 411. Vacuum port; 412. Connecting passage; 42. Insulation layer; 43. Connecting pipe; 44. Sealing gasket; 5. Vacuum gap; 51. First gap; 52. Second gap; 53. Support plate; 531. Negative pressure port; 532. Tesla valve structure; 533. Sealing gasket; 6. Machine base; 61. First vacuum hole; 7. Machine top seat; 71. Second vacuum hole; 8. Plug-in structure; 81. Plug-in boss; 82. Plug-in groove; 9. Flow system. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-6 This application is described in further detail.

[0038] Example 1

[0039] The embodiment of the present application discloses a heat-insulating sole mold.

[0040] Reference Figure 1 A heat-insulating sole mold includes an upper mold 1, a middle mold 2, a lower mold 3, and a heat-insulating mold 4, arranged in sequence. A punch 11 is fixed to the side of the upper mold 1 near the lower mold 3, and the middle mold 2 is provided with a through-groove 21 for the punch 11 to pass through. A cavity 31 is provided on the side of the lower mold 3 near the upper mold 1, and the shape of the cavity 31 matches that of the punch 11. When the upper, middle, and lower molds 1, 2, and 3 are assembled, the punch 11 can pass through the through-groove 21 and into the cavity 31, forming a closed space within the cavity 31 for foaming the sole.

[0041] The insulation mold 4 includes a vacuum bottom mold 41 and an insulation layer 42. The vacuum bottom mold 41 is made of aluminum alloy material, and the vacuum bottom mold 41 is fixed to the side of the lower mold 3 away from the upper mold 1; the insulation layer 42 is bonded and fixed to the inner walls of the vacuum bottom mold 41. The insulation layer 42 is made of a material with low thermal conductivity, which can reduce the heat exchange between the lower mold 3 and the outside air, and play a role in heat insulation.

[0042] It should be noted that, in this embodiment, the outer circumference of the lower mold 3 is smaller than the inner circumference of the vacuum bottom mold 41, and a mating structure 8 is provided between the lower mold 3 and the vacuum bottom mold 41; Figure 2 After the lower mold 3 is fixed to the vacuum bottom mold 41, the lateral positioning between the lower mold 3 and the vacuum bottom mold 41 can be achieved through the plug-in structure 8. At this time, the lower mold 3 and the insulation layer 42 can be spaced apart to form a first gap 51, and the lower mold 3 and the vacuum bottom mold 41 can be spaced apart to form a second gap 52. It can be seen that the first gap 51 and the second gap 52 can be connected to each other and form a vacuum gap 5 together.

[0043] Back to Figure 1 The lower mold 3 is provided with extensions 33 on all sides. Each extension 33 is integrally formed with the lower mold 3 and is located on the side of the lower mold 3 closest to the upper mold 1. The mating structure 8 includes a mating protrusion 81 and a mating groove 82 that mates with the mating protrusion 81. In this embodiment, the mating protrusion 81 is integrally formed on the side of the extension 33 away from the upper mold 1, while the mating groove 82 is provided on the side of the vacuum bottom mold 41 closest to the upper mold 1. By correspondingly inserting the mating protrusions 81 into the mating grooves 82, the lower mold 3 can be accurately positioned.

[0044] It should be noted that, in another feasible embodiment, the plug-in boss 81 can be integrally formed on the side of the vacuum bottom mold 41 close to the upper mold 1, and the plug-in groove 82 can be correspondingly opened on the side of the extension portion 33 away from the upper mold 1, which can also achieve lateral positioning between the lower mold 3 and the vacuum bottom mold 41.

[0045] Reference Figure 2 A plurality of first negative pressure holes 32 are provided on the inner wall of the mold cavity 31 of the lower mold 3, and some of the first negative pressure holes 32 are connected to the first gap 51 at one end away from the mold cavity 31, while the other first negative pressure holes 32 are connected to the second gap 52 at one end away from the mold cavity 31; a flow path system 9 for steam heating or water cooling is also provided inside the lower mold 3, and the flow path system 9 is arranged around the outer peripheral side of the mold cavity 31, and the two ports of the flow path system 9 are both through the bottom surface of the lower mold 3, which can serve as the inlet and outlet of the medium respectively.

[0046] A vacuum port 411 is provided on the side of the vacuum bottom mold 41 away from the lower mold 3, and the vacuum port 411 passes through the inner side of the vacuum bottom mold 41 and is connected to the vacuum gap 5; when the lower mold 3 of the sole mold is in use, the vacuum bottom mold 41 will be installed on the machine base 6 of the molding equipment, and the machine base 6 is provided with a first vacuum hole 61, and the first vacuum hole 61 can be arranged opposite the vacuum port 411; the molding equipment is provided with a first vacuum pumping device for connecting to the first vacuum hole 61. By controlling the operation of the first vacuum pumping device, the air inside the mold cavity 31 can be extracted in sequence through the first negative pressure hole 32, the vacuum gap 5, the vacuum port 411 and the first vacuum hole 61, thereby forming a negative pressure inside the mold cavity 31.

[0047] When performing foam molding of the sole, a film is laid on the surface of the mold cavity 31 of the lower mold 3, and the middle mold 2 is used to press the film against the lower mold 3. Preheating the film can make the film in an extended state; then the first vacuum device is controlled to operate, and the first vacuum device extracts the air inside the mold cavity 31, which can form a negative pressure in the first negative pressure hole 32 and allow the film to be adsorbed on the inner wall of the mold cavity 31.

[0048] Reference Figure 3 Multiple support plates 53 are provided within the vacuum gap 5. In this embodiment, the support plates 53 are fixed to the inner bottom wall of the vacuum bottom mold 41. When the lower mold 3 is fixedly mounted on the vacuum bottom mold 41, the support plates 53 can abut against the bottom surface of the lower mold 3, thereby supporting the lower mold 3 and reducing the possibility of deformation or even cracking of the lower mold 3 under stress. In this embodiment, the support plates 53 are spaced apart along the extension direction of the vacuum bottom mold 41, and the length of the support plates 53 is less than the width of the vacuum bottom mold 41. This ensures that the air passages formed between adjacent support plates 53 can communicate with each other, without affecting the normal vacuum operation of the first vacuum pumping device.

[0049] It should be noted that, in another feasible embodiment, the support plate 53 can also be fixed to the bottom surface of the lower mold 3. When the lower mold 3 is fixedly installed on the vacuum bottom mold 41, the support plate 53 can be against the inner bottom wall of the vacuum bottom mold 41 and can also play an auxiliary supporting role.

[0050] The inner bottom wall of the vacuum bottom mold 41 is fixed with two plug-in pipes 43, and the outer peripheral surface of each plug-in pipe 43 is fixed with a sealing gasket 44; Figure 2 When the lower mold 3 is fixed to the vacuum bottom mold 41, the two connecting pipes 43 can be respectively inserted into the two ports of the flow system 9, and the setting of the sealing gasket 44 can improve the sealing performance between the connecting pipes 43 and the ports of the flow system 9.

[0051] Back to Figure 3Two connecting passages 412 are also provided on the outer side of the vacuum bottom mold 41, and the two connecting passages 412 are respectively connected to the two plug-in pipes 43; when the lower mold 3 is fixed to the vacuum bottom mold 41, by introducing steam or cooling water and other media into one of the connecting passages 412, the medium can enter the flow path system 9 in one direction and be discharged from the other connecting passage 412, which can reduce the situation where the medium is blocked inside the flow path system 9 while quickly heating or cooling, so as to ensure the normal use of the sole mold.

[0052] Back to Figure 2 The side of the upper mold 1 away from the lower mold 3 is provided with an inner concave cavity 13, and the male mold 11 and the upper mold 1 are jointly provided with a second negative pressure hole 12. There are multiple second negative pressure holes 12, and each second negative pressure hole 12 is connected to the inner concave cavity 13. When the upper mold 1 of the sole mold is in use, the vacuum bottom mold 41 will be installed on the machine top seat 7 of the molding equipment. The machine top seat 7 is provided with a second vacuum hole 71, and the second vacuum hole 71 can be connected to the inner concave cavity 13; the molding equipment is equipped with a second vacuum device for connecting to the second vacuum hole 71. By controlling the operation of the second vacuum device, the air inside the mold cavity 31 can be extracted through the second negative pressure hole 12, the inner concave cavity 13 and the second vacuum hole 71 in sequence.

[0053] During the foaming molding of the sole, after the film is adsorbed on the inner wall of the mold cavity 31 by the negative pressure of the first negative pressure hole 32, the foaming material is filled into the mold cavity 31 and pressed against the film, the upper mold 1 and the lower mold 3 are closed, and the second vacuum device is controlled to operate to extract the air between the foaming material and the film, which is conducive to the close adhesion between the foaming material and the film and improves the molding quality of the sole.

[0054] It should be noted here that the foaming material used in this embodiment can be foaming particles or a foaming body that is initially foamed and molded. When a foaming body is used, micropores will be formed in the foaming body during the initial foaming and molding to facilitate the discharge of air. At the same time, each second negative pressure hole 12 needs to be arranged around the outer edge of the punch 11 to ensure that the air between the foaming body and the film can be smoothly extracted through the gap between the foaming body and the film to ensure the molding quality.

[0055] The upper mold 1 also has a flow system 9 for steam heating or water cooling. Its structure is basically the same as that of the flow system 9 of the lower mold 3 and will not be described in detail here. It should be noted that the flow system 9 in the upper mold 1 is not connected to the second negative pressure hole 12.

[0056] Example 2

[0057] The embodiment of the present application discloses a heat-insulating sole mold.

[0058] Reference Figure 4 The embodiment of the present application discloses a heat-insulating sole mold, and the remaining components are the same as those in Example 1, and will not be described here one by one; the difference from Example 1 is that the two ends of the support plate 53 in this embodiment are respectively abutted against the inner walls of the two sides of the vacuum bottom mold 41, and each support plate 53 is provided with a negative pressure vent 531 for air to pass through.

[0059] At this time, each support plate 53 can separate the vacuum gap 5, and adjacent air channels are connected to each other through the negative pressure port 531, which can effectively extend the flow path of air inside the vacuum gap 5, reduce the loss of heat inside the lower mold 3, and thus play a role in heat insulation, so that the internal temperature of the lower mold 3 and the heating set temperature are maintained within a small difference range to ensure the molding quality of the sole.

[0060] Example 3

[0061] The embodiment of the present application discloses a heat-insulating sole mold.

[0062] Reference Figure 5 The embodiment of the present application discloses a heat-insulating sole mold, and the remaining components are the same as those in Example 2, and will not be described here one by one; the difference from Example 3 is that each negative pressure port 531 in this embodiment is equipped with a Tesla valve structure 532.

[0063] When the first vacuuming device operates to evacuate vacuum gap 5, air within mold cavity 31 enters vacuum gap 5 and can normally pass through Tesla valve structure 532 and be extracted through vacuum port 411, facilitating proper adhesion of the film to the inner wall of mold cavity 31. Subsequently, after the film is firmly attached to the inner wall of mold cavity 31, air backflow through Tesla valve structure 532 is severely hindered. In this case, controlling the first vacuuming device to operate intermittently ensures that each first negative pressure port 32 maintains a sufficient negative pressure to securely adhere to the film, thus achieving energy savings.

[0064] In addition, after the sole is foamed and formed, the first vacuum device is turned off, and during the cooling stage, the air can slowly flow back to the first negative pressure hole 32 through the Tesla valve structure 532 to facilitate the subsequent demoulding operation of the sole.

[0065] Example 4

[0066] The embodiment of the present application discloses a heat-insulating sole mold.

[0067] Reference Figure 6The embodiment of the present application discloses a heat-insulating sole mold, and the remaining components are the same as those in Example 1, and will not be described here one by one; the difference from Example 1 is that in this embodiment, the working surface of the support plate 53 is bonded with a sealing pad layer 533, and the working surface referred to here refers to the top surface of the support plate 53. It can be known that if the support plate 53 is fixed to the bottom surface of the lower mold 3, then the working surface of the support plate 53 is the bottom surface of the lower mold 3.

[0068] The sealing pad layer 533 of this embodiment is made of silicone or rubber material. When the lower mold 3 is fixedly installed on the vacuum bottom mold 41, the support plate 53 and the lower mold 3 can be flexibly abutted, which can reduce the collision and wear between the support plate 53 and the lower mold 3, and maintain a good service life of the sole mold.

[0069] It can be understood that the solution in this embodiment is also applicable to Example 2 or Example 3.

[0070] 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 heat-insulating sole mold, characterized by: It comprises a lower mold (3) and a heat-insulating mold (4), wherein the lower mold (3) is provided with a mold cavity (31) for molding the sole, and the inner wall of the mold cavity (31) is provided with a plurality of first negative pressure holes (32) penetrating the outer side surface of the lower mold (3); The heat-insulating mold (4) comprises a vacuum bottom mold (41) for fixing the lower mold (3) and a heat-insulating layer (42) provided on each inner wall of the vacuum bottom mold (41); when the lower mold (3) is fixed to the vacuum bottom mold (41), a vacuum gap (5) for heat insulation is formed between the lower mold (3) and the vacuum bottom mold (41); a vacuum port (411) communicating with the vacuum gap (5) is provided on the outer wall of the vacuum bottom mold (41); the vacuum port (411) is used to cooperate with a first vacuum pumping device of the machine base (6) to form negative pressure; A plurality of support plates (53) are provided inside the vacuum gap (5), and the support plates (53) are fixed to the bottom surface of the lower mold (3) or the inner bottom wall of the vacuum bottom mold (41). When the lower mold (3) is fixed to the vacuum bottom mold (41), the support plates (53) correspondingly abut against the inner bottom wall of the vacuum bottom mold (41) or the bottom surface of the lower mold (3); and air passages for air to pass through are provided between adjacent support plates (53).

2. The heat-insulating sole mold according to claim 1, characterized in that: The two ends of the support plate (53) are respectively in contact with the inner walls of the vacuum bottom mold (41) on both sides. All the support plates (53) are arranged at intervals along the extension direction of the vacuum bottom mold (41), and each of the support plates (53) is provided with a negative pressure port (531) for air to pass through.

3. The heat-insulating sole mold according to claim 2, characterized in that: The negative pressure port (531) is equipped with a Tesla valve structure (532).

4. The heat-insulating sole mold according to any one of claims 1 to 3, characterized in that: A sealing pad layer (533) is bonded to the working surface of the support plate (53).

5. The heat-insulating sole mold according to claim 1, characterized in that: A mating structure (8) for lateral positioning is provided between the lower mold (3) and the vacuum bottom mold (41); when the lower mold (3) is fixed to the vacuum bottom mold (41), a first gap (51) is formed between the lower mold (3) and the heat insulation layer (42); a second gap (52) is formed between the lower mold (3) and the vacuum bottom mold (41); the first gap (51) and the second gap (52) together form the vacuum gap (5); and the end of the first negative pressure hole (32) away from the mold cavity (31) is connected to the first gap (51) or the second gap (52).

6. The heat-insulating sole mold according to claim 5, characterized in that: The plug-in structure (8) comprises a plug-in boss (81) and a plug-in groove (82) that are plugged and adapted to each other, the plug-in boss (81) being arranged on the lower mold (3) or the vacuum bottom mold (41), and the plug-in groove (82) being correspondingly opened on the vacuum bottom mold (41) or the lower mold (3).

7. The heat-insulating sole mold according to claim 1, characterized in that: A flow path system (9) is provided inside the lower mold (3), and the flow path system (9) is arranged around the outer periphery of the mold cavity (31), and two ports of the flow path system (9) are respectively connected to the bottom surface of the lower mold (3); Two plug-in pipes (43) are fixed to the inner bottom wall of the vacuum bottom mold (41). When the lower mold (3) is fixed to the vacuum bottom mold (41), the two plug-in pipes (43) are respectively inserted into the two ports of the flow path system (9). Two connecting passages (412) are provided on the outer side surface of the vacuum bottom mold (41). The two connecting passages (412) are respectively connected to the two plug-in pipes (43).

8. The heat-insulating sole mold according to claim 7, characterized in that: A sealing gasket is bonded to the outer peripheral surface of the plug-in pipe (43).

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