A mold and method for producing three-density shoes

Abstract

The present invention discloses a mold and method for producing three-density shoes. The mold for producing three-density shoes includes a side mold assembly, a bottom mold assembly embedded in the side mold assembly, a dummy last and an upper last located directly above the bottom mold assembly. The bottom mold assembly includes a base bottom mold and a flip bottom mold flip-connected to the base bottom mold. The side mold assembly includes a base side mold and a flip side mold hinged to the base side mold. The base bottom mold, flip bottom mold, base side mold, flip side mold, dummy last, and upper last cooperate with each other to form a first mold cavity, a second mold cavity, and a third mold cavity for injecting each layer of the sole. A method for producing three-density shoes using the above mold is as follows: first, the outsole is injected into the first mold cavity or a prefabricated outsole is used, then the insole is injected into the second mold cavity, and then the midsole is injected into the third mold cavity. The present invention has a reasonable structure, is easy to use, and has strong practicality, and can effectively improve production quality and production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of shoe-making molds, in particular to a mold and a method for producing three-density shoes. Background Art

[0002] The soles of three-density shoes include an insole at the upper layer, a midsole at the middle layer, and an outsole at the bottom layer. The three layers of the sole are made of materials of three densities respectively. This sole made of three-density materials can achieve soft and comfortable upper layer while ensuring that the lower layer is wear-resistant and non-slip. Three-density shoes are produced in large quantities by manufacturers due to their advantages of good quality and high comfort.

[0003] Existing shoemaking molds typically consist of a base mold and a side mold. Currently, when producing three-density shoes, two sets of molds must be installed at two workstations, one at a time. First, one set of molds is used at one workstation to mold the insole and the upper, which is mounted on a shoe last. The upper, mounted on the shoe last, is then transferred to another set of molds at another workstation to mold the midsole and outsole. This current technology for producing three-density shoes requires two workstations and two sets of molds to complete a single production task, resulting in low workstation utilization and impacting production efficiency. Furthermore, during the production process, the upper must be mounted and fixed to the shoe last twice at different workstations. This two-step process results in positioning errors, which impacts the mold quality of the sole and results in poor bonding strength, severely affecting the production quality of three-density shoes. Furthermore, the two steps of mounting and fixing the upper waste time, impacting production efficiency. Summary of the Invention

[0004] In order to solve the above deficiencies in the prior art, the present invention aims to provide a mold and method for producing three-density shoes, so as to achieve the purpose of improving the production quality and production efficiency of the three-density shoes.

[0005] To achieve the above object, the technical solutions adopted by the present invention are as follows:

[0006] A mold for producing three-density shoes, comprising a side mold assembly, a bottom mold assembly embedded in the side mold assembly, a dummy last and an upper last head arranged directly above the bottom mold assembly, the bottom mold assembly comprising a base bottom mold and a flip bottom mold flip-connected to the base bottom mold, the side mold assembly comprising a base side mold and a flip side mold hinged to the base side mold; wherein the base side mold comprises a left base side mold and a right base side mold that are detachably connected, and the flip side mold comprises a left flip side mold and a right flip side mold hinged to the left base side mold and the right base side mold respectively. The rotating side mold; the left flip side mold, the right flip side mold and the left base side mold and the right base side mold after the mold is closed form a space for the embedded bottom mold assembly; the base bottom mold is provided with a first groove to cooperate with the dummy last to form a first mold cavity for injecting the outsole; the flip bottom mold is provided with a second groove to cooperate with the flip side mold and the upper last equipped with the upper to form a second mold cavity for injecting the insole; the base bottom mold with the outsole attached cooperates with the base side mold and the upper last equipped with the upper attached to form a third mold cavity for injecting the midsole.

[0007] As a limitation of the above-mentioned mold, the flip bottom mold is flip-connected to the base bottom mold through a connecting rod, and both ends of the connecting rod are connected to the base bottom mold and the flip bottom mold through pins respectively.

[0008] As a further limitation of the above mold, a snap-fitting block is provided on the upper surface of the base bottom mold, and an inner groove adapted to the snap-fitting block is provided at a corresponding position on the lower surface of the flip bottom mold.

[0009] As a further limitation of the above mold, the upper surface of the base bottom mold is provided with an arc-shaped end surface around the circumference.

[0010] As a further limitation of the above mold, an annular groove is provided on the arc-shaped end surface.

[0011] As another limitation of the above mold, a first injection channel and a second injection channel are provided at the contact surface between the left base side mold and the right base side mold.

[0012] The present invention also provides a method for producing three-density shoes using the above mold, comprising the following steps:

[0013] Step 1: Filling a first polymer mixture into a first mold cavity to form an outsole of a shoe;

[0014] Step 2: injecting a second polymer mixture into the second mold cavity so that the second polymer mixture is injected and pressed onto the upper surface to form the insole of the shoe;

[0015] Step 3: injecting a third polymer mixture into the third mold cavity, so that the third polymer mixture is injected and pressed together with the outsole and the insole to form the midsole of the shoe;

[0016] Step 4: After the three-density sole is firmly bonded, remove the three-density shoe from the mold.

[0017] As a limitation of the above method, step one may also be to use a prefabricated outsole, install the prefabricated outsole in the first groove of the base bottom mold, and make the prefabricated outsole fit firmly with the first groove.

[0018] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0019] The mold of the present invention cooperates with the base bottom mold, the flip bottom mold, the base side mold, the flip side mold, the dummy last, and the upper last to form a first mold cavity, a second mold cavity, and a third mold cavity for injecting and pressing each layer of the sole. The production task that originally required two workstations and two sets of molds can be completed by using one workstation and one set of molds, which can improve the effective utilization rate of the workstations. In addition, in the method of producing three-density shoes using the mold of the present invention, only the step of installing and fixing the shoe upper on the upper last is required once, and there is no need to install and fix the shoe upper on the upper last of the corresponding workstation twice. Therefore, the influence of the error caused by installing and fixing the shoe upper on the upper last twice at two workstations on the sole molding quality can be avoided, which can effectively improve the production quality and production efficiency.

[0020] The present invention has a reasonable structure, is easy to use, and is highly practical. It can complete the production of three-density shoes using a single workstation and a set of molds, thereby increasing the effective utilization of workstations while also improving production quality and efficiency. It is suitable for use in the production process of injection-molding three-density soles. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of the structure of the bottom mold assembly in an embodiment of the present invention;

[0024] Figure 3 This is a structural schematic diagram of the bottom mold assembly in the expanded state according to an embodiment of the present invention;

[0025] Figure 4 This is a front view of the base bottom mold in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the structure of the side mold assembly in an embodiment of the present invention;

[0027] Figure 6 A top view of a side mold assembly according to an embodiment of the present invention;

[0028] In the figure: 1. Base bottom mold; 2. Flip bottom mold; 3. First groove; 4. Second groove; 5. Engaging block; 6. Connecting rod; 7. Left base side mold; 8. Left flip side mold; 9. Right base side mold; 10. Right flip side mold; 11. Upper last; 12. Support member; 13. Dummy last; 14. Hinge; 15. First injection channel; 16. Second injection channel; 17. Male locating pin; 18. Female locating pin; 19. Arc end face; 20. Annular groove; 21. Pin shaft. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and understand the present invention and are not intended to limit the present invention.

[0030] Example 1 A mold for producing three-density shoes

[0031] like Figure 1 As shown, this embodiment includes a side mold assembly, a bottom mold assembly embedded in the side mold assembly, a dummy last 13 and an upper last 11 located directly above the bottom mold assembly. The dummy last 13 and the upper last 11 are assembled on a support member 12 at a 180-degree relative position. The support member 12 can rotate 360 ​​degrees about its transverse axis so that the dummy last 13 and the upper last 11 alternately face the bottom mold assembly as needed. In this embodiment, the upper last 11 is oriented upward and the dummy last 13 is oriented downward. It should be noted in advance that this embodiment needs to be assembled on an appropriate disc-type upper injection molding machine for shoemaking. This disc-type upper injection molding machine is an existing technology well known to those skilled in the art and will not be described in detail here.

[0032] like Figure 2 、 Figure 3 As shown, the bottom mold assembly includes a base bottom mold 1 and a flip bottom mold 2 flippedly connected to the base bottom mold 1, wherein the flip bottom mold 2 is flippedly connected to the base bottom mold 1 via a connecting rod 6, and the two ends of the connecting rod 6 are respectively connected to the base bottom mold 1 and the flip bottom mold 2 via a pin 21. In this embodiment, one end of the connecting rod 6 is connected to the side surface of the base bottom mold 1 along the long side direction of the base bottom mold 1 via the pin 21, and the other end is connected to the side surface of the flip bottom mold 2 on the same side as the base bottom mold 1 via the pin 21. The flip bottom mold 2 is flipped upward by the connecting rod 6, so that the bottom surface of the flip bottom mold 2 can be against the top surface of the base bottom mold 1. In addition, a first groove 3 is provided on the base bottom mold 1, and a second groove 4 is provided on the flip bottom mold 2.

[0033] like Figure 5 、 Figure 6As shown, the side mold assembly includes a base side mold and a flip side mold hinged to the base side mold. The base side mold includes a detachably connected left base side mold 7 and a right base side mold 9. Specifically, the left base side mold 7 and the right base side mold 9 are detachably connected via a male locating pin 17 and a female locating pin 18. The flip side mold includes a left flip side mold 8 and a right flip side mold 10, which are respectively hinged to the left base side mold 7 and the right base side mold 9 via hinges 14. Furthermore, the left flip side mold 8 and the right flip side mold 10, together with the closed left base side mold 7 and the right base side mold 9, form a space for the bottom mold assembly to be inserted.

[0034] It should be noted that the first groove 3 cooperates with the dummy last 13 to form a first mold cavity for injecting the outsole; the second groove 4 cooperates with the flip side mold and the upper last 11 equipped with the upper to form a second mold cavity for injecting the insole; the base bottom mold 1 with the outsole attached cooperates with the base side mold and the upper last 11 equipped with the upper attached with the insole to form a third mold cavity for injecting the midsole.

[0035] A first injection channel 15 and a second injection channel 16 are provided at the contact surface of the left base side mold 7 and the right base side mold 9. The first injection channel 15 is connected to the second mold cavity, and the second injection channel 16 is connected to the third mold cavity; in addition, the first injection channel 15 is positioned at a lower height than the second injection channel 16.

[0036] like Figure 2 、 Figure 3 As shown, in order to improve the practicality of this embodiment, a snap-fit ​​block 5 is provided on the upper surface of the base bottom mold 1, and an inner groove adapted to the snap-fit ​​block 5 is provided on the corresponding position of the lower surface of the flip bottom mold 2, thereby ensuring that the flip bottom mold 2 can be firmly snapped onto the base bottom mold 1. In addition, as Figure 4 As shown, this embodiment features an arcuate end surface 19 around the top surface of the base mold 1. This provides a cushioning effect when the bottom surface of the flip mold 2 contacts the top surface of the base mold 1, achieving a cushioned contact and providing some protection for the mold. In this embodiment, an annular groove 20 is provided on the arcuate end surface 19. The outer sole is provided with a raised annular rubber layer around its perimeter. This raised annular rubber layer engages within the annular groove 20, further securing the outer sole more stably within the first groove 3 of the base mold 1.

[0037] Example 2 A method for producing three-density shoes

[0038] This embodiment provides a method for producing three-density shoes, which is completed based on the mold provided in Example 1.

[0039] The method for producing three-density shoes in this embodiment comprises the following steps:

[0040] Step 1: Fill the first mold cavity with a first polymer mixture to form the outsole of the shoe.

[0041] The specific method is as follows: the dummy last 13 moves downward into the left base side mold 7 and the right base side mold 9, and the base bottom mold 1 moves upward against the dummy last 13. When the distance between the top of the base bottom mold 1 and the bottom of the dummy last 13 is the required injection-molded outsole thickness, the movement stops. At this time, a first mold cavity for injecting the outsole is formed between the base bottom mold 1 and the dummy last 13. The first mold cavity is defined at the bottom and sides by the first groove 3 on the base bottom mold 1 and at the top by the bottom surface of the dummy last 13. The first polymer mixture is injected, cast or injected into the first mold cavity to form the outsole of the shoe. It should be noted that step one can also be performed by using a prefabricated outsole. The specific method is as follows: the prefabricated outsole is installed in the first groove 3 of the base bottom mold 1 so that the prefabricated outsole fits firmly with the first groove 3.

[0042] Step 2: injecting a second polymer mixture into the second mold cavity so that the second polymer mixture is injected and pressed onto the upper surface to form the insole of the shoe.

[0043] The specific method is as follows: the dummy last 13 moves upward, and then rotates 180 degrees through the supporting member 12. At this time, the dummy last 13 is directed upward, and the upper last 11 is directed downward. The upper is assembled on the upper last 11, and then the base bottom mold 1 moves downward to the initial position. The flip bottom mold 2 is flipped upward through the connecting rod 6, so that the bottom surface of the flip bottom mold 2 is against the top surface of the base bottom mold 1 with the outsole attached. The upper last 11 equipped with the upper moves downward to the left flip side mold 8 and the right flip side mold 10 in the flipped and unfolded state. The upper last 11 equipped with the upper moves downward to abut against the flip bottom mold 2. When the distance between the bottom of the upper last 11 equipped with the upper and the top of the flip bottom mold 2 is the inner distance required for injection molding, the upper last 11 is pressed against the flip bottom mold 2. When the thickness of the sole is measured, the movement is stopped, and the left flip side mold 8 and the right flip side mold 10 are flipped and closed, so that the bottom surfaces of the left flip side mold 8 and the right flip side mold 10 are against the top surface of the flip bottom mold 2. At this time, a second mold cavity for injecting the insole is formed between the flip bottom mold 2, the left flip side mold 8, the right flip side mold 10 and the upper last 11 equipped with the upper. The second mold cavity is defined by the flip bottom mold 2 at the bottom, by the left flip side mold 8 and the right flip side mold 10 at the side, and by the bottom surface of the upper last 11 equipped with the upper at the top. The second polymer mixture is injected into the second mold cavity through the first injection channel 15, so that the second polymer mixture is injected and pressed on the upper surface to form the insole of the shoe.

[0044] Step 3: injecting a third polymer mixture into the third mold cavity, so that the third polymer mixture is injection-pressed together with the outsole and the insole to form the midsole of the shoe.

[0045] The specific method is as follows: unfold the left flip side mold 8 and the right flip side mold 10, the upper last 11 equipped with the upper attached with the insole moves upward, the flip bottom mold 2 is flipped to the side of the base bottom mold 1 through the connecting rod 6, the upper last 11 equipped with the upper attached with the insole moves downward to the left base side mold 7 and the right base side mold 9, the left base side mold 7 and the right base side mold 9 are closed and stuck in the shoe mouth part of the upper, the base bottom mold 1 with the outsole moves upward, and stops moving when the distance between the top of the base bottom mold 1 and the bottom of the upper last 11 equipped with the upper attached with the insole is the required midsole thickness for injection. At this point, a third mold cavity for injecting the midsole is formed between the base mold 1 with the outsole attached, the left base mold 7, the right base mold 9, and the upper last 11 with the insole attached. The third mold cavity is defined at the bottom by the outsole placed inside the base mold 1, at the sides by the left and right base molds 7 and 9, and at the top by the bottom surface of the upper last 11 with the insole attached. The third polymer mixture is injected into the third mold cavity through the second injection channel 16, and the third polymer mixture is injected and pressed together with the outsole and insole to form the midsole. This completes the injection molding production of the three-density sole.

[0046] Step 4: After the three-density sole is firmly bonded, remove the three-density shoe from the mold.

[0047] The specific method is as follows: After the three-density sole is firmly bonded, the three-density shoe is removed from the mold. Specifically, the base mold 1 is moved downward to its original position, the left and right flip molds 8 and 10 are unfolded, and the upper last 11 is moved upward. Then, the support member 12 is rotated 180 degrees, so that the dummy last 13 and the upper last 11 are moved to their initial positions, that is, the dummy last 13 is facing downward and the upper last 11 is facing upward. Then, the shoe with the three-density sole injected is removed from the upper last 11.

[0048] It should be noted that when a prefabricated outsole is used, an outsole made of rubber or thermoplastic polyurethane is usually preferred. When the outsole is injected using the present embodiment, the first polymer is preferably a rubber material or a thermoplastic polyurethane material. When the insole and midsole are injected using the present embodiment, the second polymer and the third polymer are usually polyurethane materials, preferably expanded polyurethane materials.

[0049] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A mold for producing three-density shoes, comprising a side mold assembly, a bottom mold assembly embedded in the side mold assembly, a dummy last located directly above the bottom mold assembly, and an upper last, characterized in that: The bottom mold assembly includes a base bottom mold and a flip bottom mold flip-connected to the base bottom mold, and the side mold assembly includes a base side mold and a flip side mold hinged to the base side mold; The base side mold includes a detachably connected left base side mold and a right base side mold, and the flip side mold includes a left flip side mold and a right flip side mold respectively hinged on the left base side mold and the right base side mold; the left flip side mold, the right flip side mold and the left base side mold and the right base side mold after mold closing form a space for fitting the bottom mold assembly; The base bottom mold is provided with a first groove to cooperate with the dummy last to form a first mold cavity for injection molding the outer sole; A second groove is provided on the flip bottom mold to cooperate with the flip side mold and the upper last equipped with the upper to form a second mold cavity for injecting the insole; The base bottom mold with the outer sole attached cooperates with the base side mold and the shoe last equipped with the shoe upper attached with the insole to form a third mold cavity for injecting the midsole.

2. A mold for producing three-density shoes according to claim 1, characterized in that: The flip bottom mold is flip-connected to the base bottom mold through a connecting rod, and both ends of the connecting rod are connected to the base bottom mold and the flip bottom mold through pins respectively.

3. A mold for producing three-density shoes according to claim 2, characterized in that: A snap-fitting block is provided on the upper surface of the base bottom mold, and an inner groove adapted to the snap-fitting block is provided at a corresponding position on the lower surface of the flip bottom mold.

4. The mold for producing three-density shoes according to claim 3, characterized in that: An arc-shaped end surface is provided around the upper surface of the base bottom mold.

5. The mold for producing three-density shoes according to claim 4, characterized in that: An annular groove is provided on the arc-shaped end surface.

6. A mold for producing three-density shoes according to any one of claims 1 to 5, characterized in that: A first injection channel and a second injection channel are provided at the contact surface between the left base side mold and the right base side mold.

7. A method for producing triple-density shoes using the mold according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Filling a first polymer mixture into a first mold cavity to form an outsole of a shoe; Step 2: injecting a second polymer mixture into the second mold cavity so that the second polymer mixture is injected and pressed onto the upper surface to form the insole of the shoe; Step 3: injecting a third polymer mixture into the third mold cavity, so that the third polymer mixture is injected and pressed together with the outsole and the insole to form the midsole of the shoe; Step 4: After the three-density sole is firmly bonded, remove the three-density shoe from the mold.

8. The method for producing triple-density shoes according to claim 7, characterized in that: The step 1 may also be to use a prefabricated outsole, and install the prefabricated outsole in the first groove of the base bottom mold so that the prefabricated outsole fits firmly with the first groove.

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