Sole mold with negative pressure maintaining function

Abstract

The utility model relates to the field of shoe mold design, and provides a shoe sole mold with a negative pressure maintaining function, the shoe sole mold 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 vacuum opening communicated with the vacuum gap is formed in the outer wall of the vacuum bottom die, and the vacuum opening is used for being matched with a first vacuumizing device of the machine table base to form negative pressure; the vacuum bottom die is provided with a one-way mechanism used for limiting gas from flowing back to the vacuum gap, and an unlocking mechanism is arranged between the vacuum bottom die and the lower die and used for eliminating negative pressure in the first negative pressure hole after the shoe sole is formed. On the basis, electric energy loss in the shoe sole forming process can be reduced, and the effects of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] This application relates to the field of shoe mold design, and particularly to a sole mold with a negative pressure maintaining function. Background Art

[0002] A sole mold is an important tool for manufacturing soles in industrial production. It can obtain the required sole products through methods such as injection molding, blow molding, extrusion, and foaming.

[0003] Currently, Chinese Patent No. CN117584513A discloses a sole manufacturing method and the sole obtained thereby. The sole includes a sole body and a film coated on the outer surface of the sole body, and the two are tightly bonded; in the specific processing process, by laying the film on the surface of the lower mold, preheating the film, and then tightly adsorbing the thin plate on the inner wall of the mold cavity of the lower mold in a negative pressure adsorption manner; secondly, filling the mold cavity with foamed granules or pre-foamed embryos that have been foamed and molded, closing the mold cavity, and then extracting the air between the foaming material and the film through the negative pressure of the upper mold, and then heating the shoe mold to tightly bond the film to the foaming material, the sole can be obtained.

[0004] Regarding the above-mentioned related technical solutions, during the sole production process, it is necessary to continuously evacuate the lower mold to form a negative pressure, and the heat of the lower mold will be continuously taken away during the evacuation process. Therefore, in order to improve the heat loss situation, the lower mold is often placed inside an insulating mold to play a role in heat insulation and heat preservation; and, in order to keep the film attached to the inner wall of the mold cavity, it is usually necessary to continuously evacuate the first negative pressure hole, and the evacuation device is always in operation, which not only consumes a large amount of electric energy but also inevitably causes heat loss all the time, and it is necessary to continuously heat the lower mold to keep its temperature stable; based on this, the sole mold consumes a large amount of electric energy during use, which does not conform to the energy-saving and consumption-reducing concept of modern construction and needs to be improved. Summary of the Utility Model

[0005] Based on this, this application provides a sole mold with a negative pressure maintaining function, which can reduce the electric energy loss during the sole molding process and achieve the effect of energy saving and consumption reduction.

[0006] The sole mold with a negative pressure maintaining function provided by this application adopts the following technical solutions:

[0007] A sole mold with a negative pressure maintaining function includes a lower mold and an insulating mold. The lower mold is provided with a mold cavity for sole molding, and a plurality of first negative pressure holes penetrating through the outer side surface of the lower mold are provided on the inner wall of the mold cavity.

[0008] The heat-insulating mold includes a vacuum bottom mold for fixing the lower mold and heat-insulating layers provided on the inner walls of the vacuum bottom mold. When the lower mold is fixed to the vacuum bottom mold, a vacuum gap for heat preservation and insulation is formed between the lower mold and the vacuum bottom mold; a vacuum port communicating with 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 a negative pressure;

[0009] A one-way mechanism for restricting the backflow of gas into the vacuum gap is installed on the vacuum bottom mold, and an unlocking mechanism is provided between the vacuum bottom mold and the lower mold for eliminating the negative pressure inside the first negative pressure hole after the sole is molded.

[0010] By adopting the above technical solutions, when the sole is foam-molded in this application, the lower mold is fixedly installed on the vacuum bottom mold, 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 successfully evacuated; the setting of the heat-insulating layer can weaken 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] By arranging a one-way mechanism inside the vacuum gap, when the first vacuum pumping device operates and evacuates the inside of the vacuum gap, the air inside the mold cavity can smoothly leave through the vacuum port via the vacuum gap; after a period of vacuum pumping operation and the film adheres to the inner wall of the mold cavity under the action of negative pressure suction, the first vacuum pumping device is closed. The setting of the one-way mechanism can restrict the air from flowing back into the mold cavity, so that the negative pressure of the first negative pressure hole can be maintained; the first vacuum pumping device does not need to be in a long-term operating state, which can reduce the power consumption during the sole molding process and achieve the effect of energy conservation and consumption reduction. After the sole is foam-molded, by controlling the unlocking mechanism, the negative pressure inside the first negative pressure hole can be quickly eliminated, so as to facilitate the smooth demolding of the molded sole.

[0012] Optionally, the one-way mechanism includes an outer shell and an elastic core valve. The outer shell is detachably installed on the vacuum bottom mold and covers the vacuum port. A communication hole is provided at the end of the outer shell away from the vacuum; the elastic core valve is arranged between the outer shell and the vacuum bottom mold, and the elastic core valve normally blocks the communication hole.

[0013] By adopting the above technical solutions, by fixing the outer shell to the vacuum bottom mold, the elastic core valve installed inside the outer shell can normally block the communication hole; when the first vacuum pumping device operates to evacuate the vacuum gap, the negative pressure suction generated by the first vacuum pumping device can force the elastic core valve to leave the communication hole, and the internal air can smoothly leave the vacuum gap through the communication hole. After the first vacuum pumping device operates for a period of time and the film is firmly adsorbed on the inner wall of the mold cavity, the first vacuum pumping device is closed. At this time, after the elastic core valve is restored and deformed, it can re-block the communication hole, which has the function of maintaining negative pressure, can reduce the power consumption during the sole molding process, and achieve the effect of energy conservation and consumption reduction.

[0014] Optionally, the elastic core valve includes a plugging portion, a deformation portion integrally formed on the outer peripheral side of the plugging portion, and a mounting portion integrally formed on the outer peripheral side of the deformation portion. The mounting portion is clamped and fixed between the outer housing and the vacuum bottom mold; the plugging portion normally plugs the communication hole. When the first vacuum pumping device operates, the deformation portion deforms in a direction away from the lower mold and forces the plugging portion to leave the communication hole.

[0015] By adopting the above technical solution, the arrangement of the mounting portion enables the elastic core valve to be clamped and fixed between the outer housing and the vacuum bottom mold, and the plugging portion of the elastic core valve can normally plug the communication hole. When the first vacuum pumping device operates to pump the vacuum gap, the deformation portion deforms under the action of the negative pressure suction force and can make the plugging portion leave the communication hole, so that the internal air can smoothly leave the vacuum gap; after the first vacuum pumping device is closed, the deformation portion can reset and deform, and then the plugging portion plugs the communication port again to play a role in maintaining the negative pressure.

[0016] Optionally, a support plate is provided inside the vacuum gap. The support plate is fixed to the bottom surface of the lower mold or the inner bottom surface of the vacuum bottom mold; the support plate is provided with a negative pressure through hole for gas to pass through, and the one-way mechanism includes a Tesla valve structure provided at the negative pressure through hole.

[0017] By adopting the above technical solution, when the lower mold is fixed to the vacuum bottom mold, the support plate can play an auxiliary supporting role, reducing the possibility of deformation or even cracking of the lower mold during the sole molding process. In addition, by providing a Tesla valve structure at the negative pressure through hole, the air inside the mold cavity can normally pass through the Tesla valve structure and be extracted from the vacuum port after entering the vacuum gap, which is beneficial to the normal adsorption of the film on 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 blocked when flowing back through the Tesla valve structure. At this time, controlling the intermittent operation of the first vacuum pumping device can enable each first negative pressure hole to have a negative pressure for firmly adsorbing the film, and also has the advantage of energy saving.

[0018] Optionally, an insertion and matching 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 heat 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 the vacuum gap; one end of the first negative pressure hole away from the mold cavity communicates with the first gap or the second gap.

[0019] By adopting the above 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 can be maintained through the insertion structure, so that a vacuum gap can be jointly formed between the lower mold and the heat 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 pump the vacuum gap, the air inside the mold cavity can enter the first gap through the first negative pressure hole, then pass through the second gap and leave from the vacuum port. During this process, the flow path of the air is extended, the heat loss can be reduced, and the heat insulation and heat preservation effect of the heat insulation mold can be improved.

[0020] Optionally, the insertion structure includes a plugging convex column arranged on the lower mold and a plugging groove arranged on the vacuum bottom mold; a connection hole communicating with the plugging groove is provided on the bottom surface of the vacuum bottom mold, and a connection bolt is inserted through the connection hole, and the connection bolt is fixed to the plugging convex column.

[0021] By adopting the above technical solution, when the lower mold is fixed to the vacuum bottom mold, inserting the plugging convex column into the plugging groove can limit the relative position between the lower mold and the vacuum bottom mold to achieve the accurate positioning between the lower mold and the vacuum bottom mold.

[0022] Optionally, an inclined sliding groove communicating with the plugging groove is provided on the outer side surface of the vacuum bottom mold, and the unlocking mechanism includes a limiting slider arranged inside the vacuum bottom mold, and the limiting slider normally moves downward to the limit position; a first tooth-shaped part is provided on the inner side surface of the limiting slider, and a second tooth-shaped part is provided on the side surface of the plugging convex column. When the plugging convex column moves downward to abut against the inner end wall of the plugging groove, the first tooth-shaped part and the second tooth-shaped part are cooperatively limited.

[0023] By adopting the above technical solution, after the lower mold is fixed to the vacuum bottom mold, the connection bolt is passed through the connection hole and connected to the plugging convex column, forcing the plugging convex column to move downward and abut against the inner end wall of the plugging groove. At this time, the lower mold can be matched and abutted against the vacuum bottom mold to form a sealed vacuum gap, and the stable vacuum gap can be maintained by using the limiting cooperation between the first tooth-shaped part and the second tooth-shaped part. After the sole is foamed and formed, by forcing the limiting slider to move outward so that the first tooth-shaped part is disengaged from the second tooth-shaped part, the plugging convex column can move away from the vacuum bottom mold, forcing the lower mold and the vacuum bottom mold to separate from each other. At this time, the outside air can pour into the inside 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 to facilitate the subsequent demolding operation of the sole.

[0024] Optionally, the unlocking mechanism further includes a return spring arranged inside the plugging groove, one end of the return spring abuts against the inner wall of the plugging groove, and the other end abuts against the plugging convex column; the return spring normally forces the lower mold and the vacuum bottom mold to be spaced apart, and at this time, the end of the connection bolt abuts against the inner end wall of the connection hole.

[0025] By adopting the above technical solution, the reset spring is arranged to always generate an elastic force acting on the plugging convex post, so that when forcing the limiting slider to move outwards to separate the first tooth-shaped part from the second tooth-shaped part, the plugging convex post can move away from the vacuum bottom die under the elastic force of the reset spring, enabling the lower die to automatically separate from the vacuum bottom die and improving the operation convenience.

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

[0027] 1. By arranging a one-way mechanism inside the vacuum gap, after a period of vacuum pumping operation and the film adheres to the inner wall of the cavity under the action of negative pressure suction, when closing the first vacuum pumping device, the negative pressure of the first negative pressure hole can be maintained; the first vacuum pumping device does not need to be in a long-term operating state, which can reduce the power consumption during the sole forming process and achieve the effect of energy conservation and consumption reduction.

[0028] 2. By arranging an unlocking mechanism, after the sole foaming and forming, controlling the unlocking mechanism can quickly eliminate the negative pressure inside the first negative pressure hole, facilitating the smooth demolding of the formed sole.

[0029] 3. By arranging a first gap and a second gap, when controlling the operation of the first vacuum pumping device to pump the vacuum gap, the air inside the cavity can enter the first gap through the first negative pressure hole, then pass through the second gap and leave from the vacuum port. The air flow path is extended, which can reduce the heat loss situation and further improve the heat insulation and heat preservation effect of the heat insulation die. Description of the Drawings

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

[0031] Figure 2 is a schematic diagram of the overall structure of Embodiment 1;

[0032] Figure 3 is a schematic diagram of the structure of the heat insulation die in Embodiment 1;

[0033] Figure 4 is Figure 2 an enlarged view of part A in

[0034] Figure 5 is a partial schematic diagram of the structure of the vacuum bottom die in Embodiment 1;

[0035] Figure 6 is a partial schematic diagram of the positions of the vacuum port and the first vacuum hole when the vacuum bottom die is installed on the machine base in Embodiment 2, mainly showing the specific structure of the one-way mechanism.

[0036] Description of reference numerals: 1. Upper mold; 11. Punch; 12. Second negative pressure hole; 13. Concave chamber; 2. Middle mold; 21. Through groove; 3. Lower mold; 31. Mold cavity; 32. First negative pressure hole; 33. Extension part; 331. Insertion convex column; 332. Second tooth-shaped part; 34. Flow path system; 4. Heat insulation mold; 41. Vacuum bottom mold; 411. Vacuum port; 412. Communication path; 413. Insertion groove; 414. Connection hole; 415. Connection bolt; 416. Inclined chute; 417. Concave part; 418. Inner hook groove; 42. Heat insulation layer; 43. Insertion pipe; 431. Sealing gasket sleeve;

[0037] 5. Vacuum gap; 51. First gap; 52. Second gap; 53. Support plate; 531. Negative pressure through port; 532. Tesla valve structure; 6. Machine base; 61. First vacuum hole; 7. Machine top seat; 71. Second vacuum hole; 8. One-way mechanism; 81. Outer shell; 811. Hook part; 812. Communication hole; 82. Elastic core valve; 821. Sealing part; 822. Deformation part; 823. Installation part; 83. Tesla valve mechanism; 9. Unlocking mechanism; 91. Limit slider; 911. First tooth-shaped part; 92. Return spring. Detailed implementation mode

[0038] The following further elaborates on this application Figures 1-6 with reference to the accompanying drawings.

[0039] Embodiment 1:

[0040] The embodiment of this application discloses a sole mold with a negative pressure holding function.

[0041] Referring to Figure 1 , a sole mold with a negative pressure holding function includes an upper mold 1, a middle mold 2, a lower mold 3, and a heat insulation mold 4 arranged in sequence; a punch 11 is fixed on the side of the upper mold 1 close to the lower mold 3, and the middle mold 2 is provided with a through groove 21 for the punch 11 to pass through in a matching manner; a mold cavity 31 is arranged on the side of the lower mold 3 close to the upper mold 1, and the shape of the mold cavity 31 is adapted to that of the punch 11. When the upper mold 1, the middle mold 2, and the lower mold 3 are mutually clamped, the punch 11 can pass through the through groove 21 and enter the interior of the mold cavity 31, so that a closed space can be formed inside the mold cavity 31 for the sole to be foamed and formed.

[0042] The heat insulation mold 4 includes a vacuum bottom mold 41 and a heat insulation layer 42. The vacuum bottom mold 41 is made of aluminum alloy material, and the vacuum bottom mold 41 is fixed on the side of the lower mold 3 away from the upper mold 1; the heat insulation layer 42 is adhesively fixed on each inner side wall of the vacuum bottom mold 41. The heat insulation layer 42 is made of a material with a low thermal conductivity coefficient, which can weaken the heat exchange between the lower mold 3 and the outside air and play an effect of heat insulation and heat preservation.

[0043] It should be noted that in this embodiment, the outer peripheral dimension of the lower mold 3 is smaller than the inner peripheral dimension of the vacuum bottom mold 41, and an insertion structure is provided between the lower mold 3 and the vacuum bottom mold 41; referring to 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 realized through the insertion structure. At this time, the lower mold 3 and the heat insulation layer 42 can be arranged at intervals to form a first gap 51, and a second gap 52 can be formed between the lower mold 3 and the vacuum bottom mold 41 at intervals. It can be seen that the first gap 51 and the second gap 52 can communicate with each other and jointly form a vacuum gap 5.

[0044] Back to Figure 1 , extension parts 33 are respectively arranged around the lower mold 3, and each extension part 33 is integrally formed with the lower mold 3, and each extension part 33 is located on the side of the lower mold 3 close to the upper mold 1. The insertion structure includes an insertion convex column 331 and an insertion groove 413 adapted to be inserted therewith. In this embodiment, the insertion convex column 331 is integrally formed on the side of the extension part 33 away from the upper mold 1, and the insertion groove 413 is opened on the side of the vacuum bottom mold 41 close to the upper mold 1; by correspondingly inserting the insertion convex column 331 into the insertion groove 413, the accurate positioning of the lower mold 3 can be achieved.

[0045] It should be noted that in another feasible embodiment, the insertion convex column 331 can be integrally formed on the side of the vacuum bottom mold 41 close to the upper mold 1, and the insertion groove 413 can be correspondingly opened on the side of the extension part 33 away from the upper mold 1, which can also realize the lateral positioning between the lower mold 3 and the vacuum bottom mold 41.

[0046] A plurality of first negative pressure holes 32 are provided on the inner wall of the mold cavity 31 of the lower mold 3. One end of some of the first negative pressure holes 32 away from the mold cavity 31 communicates with the first gap 51, and one end of the remaining first negative pressure holes 32 away from the mold cavity 31 communicates with the second gap 52; a flow path system 34 for steam heating or water cooling is also provided inside the lower mold 3. The flow path system 34 is arranged around the outer peripheral side of the mold cavity 31, and both ports of the flow path system 34 penetrate through the bottom surface of the lower mold 3 and can be used as the inlet and outlet of the medium respectively.

[0047] A vacuum port 411 is opened on the side of the vacuum bottom mold 41 away from the lower mold 3. The vacuum port 411 penetrates through the inner side surface of the vacuum bottom mold 41 and is connected to the vacuum gap 5; at the same time, referring to Figure 2, 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. The machine base 6 is provided with a first vacuum hole 61, and the first vacuum hole 61 can be arranged opposite to the vacuum port 411; the molding equipment is provided with a first vacuum pumping device for connecting with the first vacuum hole 61. By controlling the operation of the first vacuum pumping device, the air inside the mold cavity 31 can be sequentially extracted through the first negative pressure hole 32, the vacuum gap 5, the vacuum port 411 and the first vacuum hole 61, so as to form a negative pressure inside the mold cavity 31.

[0048] When foaming and molding the sole, by laying a film on the surface of the mold cavity 31 of the lower mold 3 and using the middle mold 2 to press the film tightly against the lower mold 3, preheating the film can make the film in an extended state; then control the operation of the first vacuum pumping device, and the first vacuum pumping device extracts the air inside the mold cavity 31, which can make the first negative pressure hole 32 form a negative pressure and make the film adsorbed on the inner wall of the mold cavity 31.

[0049] Refer to Figure 3 , a plurality of support plates 53 are arranged inside 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 installed on the vacuum bottom mold 41, the support plates 53 can abut against the bottom surface of the lower mold 3, thereby playing a role in supporting the lower mold 3 and reducing the possibility of the lower mold 3 deforming or even cracking under stress. It should be noted that in another implementable embodiment, the support plates 53 can also be fixed to the bottom surface of the lower mold 3, and when the lower mold 3 is fixedly installed on the vacuum bottom mold 41, the support plates 53 can abut against the inner bottom wall of the vacuum bottom mold 41, which can also play an auxiliary supporting role.

[0050] In this embodiment, the support plates 53 are arranged at intervals along the extension direction of the vacuum bottom mold 41, and both ends of the support plates 53 respectively abut against the inner walls on both sides of the vacuum bottom mold 41, so that an air passage can be formed between adjacent support plates 53; moreover, each support plate 53 is provided with a negative pressure through port 531 for air to pass through, and the arrangement of the negative pressure through ports 531 enables the air passages to communicate with each other.

[0051] The vacuum bottom mold 41 is equipped with a one-way mechanism 8 for restricting the gas from flowing back to the vacuum gap 5. The one-way mechanism 8 in this embodiment includes a plurality of Tesla valve structures 532, and the Tesla valve structures 532 are respectively arranged corresponding to the negative pressure through ports 531. When the first vacuum pumping device operates to pump the vacuum gap 5, the air inside the mold cavity 31 can normally pass through the Tesla valve structures 532 and be extracted through the vacuum port 411 after entering the vacuum gap 5, which is beneficial to making the film normally adsorbed on the inner wall of the mold cavity 31. After the film is firmly adsorbed on the inner wall of the mold cavity 31, the air will be severely blocked when flowing back through the Tesla valve structures 532. At this time, controlling the first vacuum pumping device to operate intermittently can enable each first negative pressure hole 32 to have a negative pressure for firmly adsorbing the film, which has the advantage of energy saving.

[0052] Return to Figure 2 , an unlocking mechanism 9 is provided between the vacuum bottom mold 41 and the lower mold 3, which is used to quickly eliminate the negative pressure inside the first negative pressure hole 32 after the sole is formed; specifically refer to Figure 4 , the unlocking mechanism 9 includes a limit slider 91 and a return spring 92. The return spring 92 is embedded inside the insertion groove 413, and one end of the return spring 92 abuts against the inner wall of the insertion groove 413; when the insertion stud 331 is inserted into the insertion groove 413, the other end of the return spring 92 abuts against the insertion stud 331, and an elastic force acting on the insertion stud 331 can be generated all the time. A connection hole 414 communicating with the insertion groove 413 is provided on the bottom surface of the vacuum bottom mold 41. The connection hole 414 is a trapezoidal hole, and a connection bolt 415 is arranged inside the connection hole 414. The connection bolt 415 passes through the inside of the return spring 92 and is fixed to the insertion stud 331.

[0053] In the initial state, the insertion stud 331 moves outward under the elastic force of the return spring 92, and the bolt end of the connection bolt 415 can abut against the inner end wall of the connection hole 414. At this time, a gap can be maintained between the lower mold 3 and the vacuum bottom mold 41, and external air can enter the inner side of the vacuum bottom mold 41 from the gap between the lower mold 3 and the vacuum bottom mold 41.

[0054] An inclined chute 416 communicating with the insertion groove 413 is provided on the outer side surface of the vacuum bottom mold 41. The limit slider 91 is fitted and installed inside the inclined chute 416, and a first toothed portion 911 formed integrally is provided on the inner side surface of the limit slider 91. In the initial state, the limit slider 91 can move downward to the limit position under its own gravity. At this time, a part of the first toothed portion 911 can be located inside the insertion groove 413; a second toothed portion 332 is provided on the side surface of the insertion stud 331, and the second toothed portion 332 is adapted to the shape of the first toothed portion 911.

[0055] Also refer to Figure 2 , after the lower mold 3 is fixedly installed on the vacuum bottom mold 41, forcing the lower mold 3 to move towards the vacuum bottom mold 41, the insertion stud 331 can move downward and finally abut against the inner end wall of the insertion groove 413. At this time, the first toothed portion 911 can cooperate with the second toothed portion 332 for limiting, and at the same time, the lower mold 3 can be firmly abutted against the vacuum bottom mold 41, so that the formed vacuum gap 5 can be kept stably sealed.

[0056] Return to Figure 4, it should be noted that in this embodiment, the top surface of the first tooth-shaped portion 911 is inclined relative to the horizontal direction, and the inclination angle is 30°-60°. When the plugging convex column 331 moves downward, it can automatically push open the limit slider 91, that is, it can automatically force the limit slider 91 to move outward; the bottom surface of the first tooth-shaped portion 911 is parallel to the horizontal direction. After the plugging convex column 331 is matched and abutted against the inner end wall of the plugging groove 413, the limit slider 91 can be reset inward under its own gravity, and the first tooth-shaped portion 911 can stably abut against the second tooth-shaped portion 332, reducing the occurrence of accidental detachment between the first tooth-shaped portion 911 and the second tooth-shaped portion 332.

[0057] In addition, a handle portion 912 is integrally formed on the outer side surface of the limit slider 91, which can facilitate the staff to move the limit slider 91; after the sole is foam-molded, the staff holds the handle portion 912 and pulls the limit slider 91 outward, and the plugging convex column 331 can automatically return to the initial state under the elastic force of the return spring 92. At this time, a gap is maintained between the lower mold 3 and the vacuum bottom mold 41, and external air can quickly rush into the first negative pressure hole 32, thereby eliminating the negative pressure suction of the first negative pressure hole 32, and also facilitating the subsequent demolding operation of the sole.

[0058] Refer to Figure 5 , two plugging pipes 43 are fixed on the inner bottom wall of the vacuum bottom mold 41, and a sealing gasket sleeve 431 is fixedly sleeved on the outer peripheral surface of each plugging pipe 43. When the lower mold 3 is fixed to the vacuum bottom mold 41, the two plugging pipes 43 can be respectively inserted into the two ports of the flow path system 34, and the setting of the sealing gasket sleeve 431 can improve the sealing performance between the plugging pipe 43 and the port of the flow path system 34.

[0059] Two communication passages 412 are also formed on the outer side surface of the vacuum bottom mold 41, and the two communication passages 412 are respectively communicated with the two plugging pipes 43; when the lower mold 3 is fixed to the vacuum bottom mold 41, by introducing a medium such as steam or cooling water into one of the communication passages 412, the medium can enter the flow path system 34 unidirectionally and be discharged from the other communication passage 412, which can quickly heat up or cool down while reducing the situation that the medium is blocked inside the flow path system 34 to ensure the normal use of the sole mold.

[0060] Return to Figure 2, on the side of the upper mold 1 away from the lower mold 3, there is a concave chamber 13. The punch 11 and the upper mold 1 are jointly provided with a plurality of second negative pressure holes 12, and each of the second negative pressure holes 12 communicates with the concave chamber 13 respectively. When the upper mold 1 of this sole mold is in use, the vacuum bottom mold 41 will be installed on the machine table top seat 7 of the molding equipment. The machine table top seat 7 is provided with a second vacuum hole 71, and the second vacuum hole 71 can communicate with the concave chamber 13; the molding equipment is equipped with a second vacuum pumping device for connecting with the second vacuum hole 71. By controlling the operation of the second vacuum pumping device, the air inside the mold cavity 31 can be sequentially extracted through the second negative pressure holes 12, the concave chamber 13 and the second vacuum hole 71.

[0061] When performing 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 inside the mold cavity 31 and abutted against the film, then the upper mold 1 and the lower mold 3 are closed, and the operation of the second vacuum pumping device is controlled to extract the air between the foaming material and the film, which is beneficial to the tight bonding between the foaming material and the film and improves the molding quality of the sole.

[0062] It should be noted here that the foaming material used in this embodiment can be foaming pellets or a foaming embryo formed by primary foaming molding. In the case of using a foaming embryo, micropores will be formed during the primary foaming molding of the foaming embryo to facilitate the discharge of air. At the same time, each of the second negative pressure holes 12 needs to be wound around the outer peripheral edge of the punch 11 for one week to ensure that the air between the foaming embryo and the film can be smoothly extracted through the gap between the foaming embryo and the film, ensuring the molding quality.

[0063] A flow path system 34 for steam heating or water cooling is also provided inside the upper mold 1, and its structure is basically the same as that of the flow path system 34 of the lower mold 3, which will not be elaborated here. It should be noted that the flow path system 34 inside the upper mold 1 and the second negative pressure holes 12 are not connected to each other.

[0064] Embodiment 2:

[0065] This application embodiment discloses a sole mold with a negative pressure maintaining function.

[0066] Refer to Figure 6 , for a sole mold with a negative pressure maintaining function disclosed in this application embodiment, the rest of the components are the same as those in Embodiment 1 and will not be elaborated here one by one; the difference from Embodiment 1 is that the one-way mechanism 8 in this embodiment includes a housing 81 and an elastic core valve 82. The housing 81 is detachably installed on the bottom surface of the vacuum bottom mold 41, and the housing 81 is fixedly covered on the vacuum port 411.

[0067] Specifically, the bottom surface of the vacuum bottom mold 41 is provided with a concave portion 417, and a circumferentially extending inner hook groove 418 is arranged on the inner side wall of the concave portion 417; an integrally formed hook portion 811 is arranged on the inner edge of the outer shell 81. By partially embedding the outer shell 81 into the concave portion 417, the hook portion 811 abuts against the inner wall of the concave portion 417 and undergoes elastic deformation. When the hook portion 811 and the inner hook groove 418 are in a position facing each other, the hook portion 811 can be fitted into the inner hook groove 418, thereby stably installing the outer shell 81 on the vacuum bottom mold 41. One end of the outer shell 81 away from the vacuum bottom mold 41 is provided with a communication hole 812, and the communication hole 812 penetrates through the outer shell 81 and is connected to the vacuum port 411 for allowing air to pass through smoothly.

[0068] The elastic core valve 82 is integrally made of silicone material. The elastic core valve 82 includes a plugging portion 821, a deformation portion 822, and a mounting portion 823. The deformation portion 822 is integrally formed on the outer peripheral side of the plugging portion 821, and the mounting portion 823 is integrally formed on the outer peripheral side of the deformation portion 822; the mounting portion 823 is fitted and arranged inside the outer shell 81. When the outer shell 81 is fixed to the concave portion 417 through the cooperation of the hook portion 811 and the inner hook groove 418, the outer shell 81 and the concave portion 417 can jointly clamp the mounting portion 823, thereby playing a role in fixing the elastic core valve 82.

[0069] The deformation portion 822 passes through the communication hole 812, and the deformation portion 822 is suspended relative to the outer shell 81, and a deformation space for the deformation of the deformation portion 822 is formed therebetween; the plugging portion 821 is arranged at the port of the communication hole 812, and the plugging portion 821 normally plugs the communication hole 812. When the first vacuum pumping device operates, the elastic core valve 82 can be deformed by the negative pressure suction force to make the deformation portion 822 deform in the direction close to the port of the communication hole 812. At this time, the plugging portion 821 can leave the communication hole 812, so that the air inside the vacuum gap 5 can be smoothly pumped out to form a negative pressure.

[0070] It can be understood that when the first vacuum pumping device stops, the deformation portion 822 can drive the plugging portion 821 to plug the communication hole 812 again through its own deformation reset, thereby restricting the situation that air flows back into the vacuum gap 5. It can make the first negative pressure hole 32 still maintain a stable negative pressure when the first vacuum pumping device is closed, which is beneficial to the smooth foaming and molding of the sole.

[0071] The above is the preferred embodiment of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sole mold with a negative pressure holding function, characterized in that: It includes a lower mold (3) and a heat-insulating mold (4). The lower mold (3) is provided with a mold cavity (31) for sole molding, and a plurality of first negative pressure holes (32) penetrating through the outer side surface of the lower mold (3) are arranged on the inner wall of the mold cavity (31). The heat-insulating mold (4) includes a vacuum bottom mold (41) for fixing the lower mold (3) and a heat-insulating layer (42) arranged 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 preservation and insulation is formed between the lower mold (3) and the vacuum bottom mold (41); a vacuum port (411) communicated with the vacuum gap (5) is arranged on the outer wall of the vacuum bottom mold (41), and the vacuum port (411) is used to cooperate with a first vacuum pumping device of a machine table base (6) to form negative pressure. A one-way mechanism (8) for restricting gas from flowing back to the vacuum gap (5) is installed on the vacuum bottom mold (41), and an unlocking mechanism (9) is arranged between the vacuum bottom mold (41) and the lower mold (3) for eliminating the negative pressure inside the first negative pressure holes (32) after sole molding.

2. The sole mold with a negative pressure maintaining function according to claim 1, characterized in that: The one-way mechanism (8) includes an outer shell body (81) and an elastic core valve (82). The outer shell body (81) is detachably installed on the vacuum bottom mold (41) and covers the vacuum port (411), and a communication hole (812) is arranged at one end of the outer shell body (81) far from the vacuum; the elastic core valve (82) is arranged between the outer shell body (81) and the vacuum bottom mold (41), and the elastic core valve (82) normally blocks the communication hole (812).

3. The sole mold with a negative pressure maintaining function according to claim 2, wherein: The elastic core valve (82) includes a blocking part (821), a deformation part (822) integrally formed on the outer peripheral side of the blocking part (821), and an installation part (823) integrally formed on the outer peripheral side of the deformation part (822). The installation part (823) is clamped and fixed between the outer shell body (81) and the vacuum bottom mold (41); the blocking part (821) normally blocks the communication hole (812), and when the first vacuum pumping device operates, the deformation part (822) deforms in a direction away from the lower mold (3) and forces the blocking part (821) to leave the communication hole (812).

4. The sole mold with a negative pressure maintaining function according to claim 1, wherein: A support plate (53) is arranged inside the vacuum gap (5), and the support plate (53) is fixed to the bottom surface of the lower mold (3) or the inner bottom surface of the vacuum bottom mold (41); the support plate (53) is provided with a negative pressure through port (531) for gas to pass through, and the one-way mechanism (8) includes a Tesla valve structure (532) arranged at the negative pressure through port (531).

5. The sole mold with a negative pressure maintaining function according to claim 1, characterized in that: An insertion and matching structure for lateral positioning is arranged 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-insulating layer (42), and 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); one end of the first negative pressure hole (32) far from the mold cavity (31) is communicated with the first gap (51) or the second gap (52).

6. The sole mold with a negative pressure maintaining function according to claim 5, characterized in that: The plugging structure includes a plugging convex column (331) provided on the lower die (3) and a plugging groove (413) provided on the vacuum bottom die (41); a connection hole (414) communicating with the plugging groove (413) is provided on the bottom surface of the vacuum bottom die (41), a connection bolt (415) is inserted inside the connection hole (414), and the connection bolt (415) is fixed to the plugging convex column (331).

7. The sole mold with a negative pressure maintaining function according to claim 6, characterized in that: An inclined sliding groove (416) communicating with the plugging groove (413) is provided on the outer side surface of the vacuum bottom die (41), the unlocking mechanism (9) includes a limit slider (91) provided inside the vacuum bottom die (41), and the limit slider (91) normally moves downward to the extreme position; a first toothed portion (911) is provided on the inner side surface of the limit slider (91), a second toothed portion (332) is provided on the side surface of the plugging convex column (331), and when the plugging convex column (331) moves downward to abut against the inner end wall of the plugging groove (413), the first toothed portion (911) and the second toothed portion (332) are cooperatively limited.

8. The sole mold with a negative pressure holding function according to claim 7, characterized in that: The unlocking mechanism (9) further includes a return spring (92) provided inside the plugging groove (413), one end of the return spring (92) abuts against the inner wall of the plugging groove (413), and the other end abuts against the plugging convex column (331); the return spring (92) normally forces the lower die (3) and the vacuum bottom die (41) to keep a gap, and at this time, the end of the connection bolt (415) abuts against the inner end wall of the connection hole (414).

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