Method and mold capable of pouring polyurethane outsole at bottom of midsole

Abstract

The invention discloses a method capable of pouring a polyurethane outsole at the bottom of an insole and a mold thereof.The method comprises the following steps that S1, an upper mold body and a lower mold body of the mold are heated; s2, the produced foaming polyurethane insole is placed in a preset position of a lower mold and positioned; s3, the upper mold and the lower mold are closed, the air bag is inflated so that the air bag can abut against the top of the insole, the insole can be pressed to the preset position of the lower mold, and a glue injection cavity is correspondingly formed below the insole; s4, injecting a material of the outsole into the glue injection chamber; s5, curing is conducted; and S6, opening the mold to obtain the shoe sole with the foamed polyurethane midsole and the thermoplastic polyurethane outsole connected with each other. According to the method, the outsole is poured after the insole is positioned, the step of positioning the outsole can be omitted in the pouring process, and finally the attachment integrity and stability between the insole and the outsole of the poured sole can be guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of sole casting, and particularly relates to a method and a mold for casting a polyurethane outsole at the bottom of a midsole. Background Art

[0002] At present, the development of the footwear field and its molding processes has been very rapid. Traditional shoe soles mainly consist of a pre-formed midsole and an outsole respectively. After repeatedly brushing a treatment agent 1-2 times on the pre-formed midsole and outsole respectively, they are bonded together by brushing glue to form a shoe sole.

[0003] With the rapid development of materials and preparation technologies, sports shoes have better functions. Currently, many of the outsoles and midsoles in common sports shoe soles are made of EVA to provide better shock absorption and wearing comfort.

[0004] For the molding of the outsole and midsole, application publication number CN107696538A discloses a hot lamination method for a thermoplastic polyurethane outsole and a foamed thermoplastic polyurethane midsole. It specifically discloses the following steps: Step ①: Injecting a thermoplastic polyurethane (TPU) material into the outsole layer of the shoe sole by in-mold injection molding; Step ②: Providing a steam heating mold, with steam injection holes provided on the inner surface of the mold cavity; Step ③: Placing the cooled thermoplastic polyurethane (TPU) outsole layer at the bottom of the mold cavity of the steam heating mold, and then filling the mold with foamed thermoplastic polyurethane (ETPU) pellets with the outsole layer as the bottom; Step ④: Introducing saturated steam into the mold through the steam injection holes to uniformly heat and pressurize the foamed thermoplastic polyurethane (ETPU) pellets, so that the foamed thermoplastic polyurethane (ETPU) pellets are melted and adhered to the upper surface of the outsole layer to form the midsole layer of the shoe sole; Step ⑤: After cooling the mold, demolding the shoe sole integrally formed with the outsole layer and the midsole layer.

[0005] In addition, application publication number CN116638806A also discloses a method for preparing a shoe sole. The specific preparation method it discloses includes the following steps: (1) Heating the outsole mold in a three-opening mold with a vacuum suction function; (2) Adding thermosetting polyurethane to the outsole mold in the three-opening mold, setting an adhesive layer, and closing the mold; (3) Opening the mold after curing to obtain the outsole; (4) Performing film suction on the outsole, then pouring the raw material of the midsole, closing the mold, and demolding after curing to obtain the shoe sole.

[0006] For the above-mentioned method of thermally bonding the thermoplastic polyurethane outsole and the foamed thermoplastic polyurethane midsole, as well as the method of manufacturing the shoe sole, they first use a mold to produce the outsole, and then fix it on the mold and pour and mold the midsole. However, this production method still has some disadvantages. For example, in order to enhance friction and grip for some sports shoe outsoles, multiple stripes are generally provided on the bottom surface of the outsole, and there are grooves between adjacent stripes, thus forming a complex anti-slip structure. Therefore, for these outsoles with complex patterns on the bottom surface, if they are produced and want to be positioned on the mold for pouring the midsole, it is often necessary to correspondingly provide multiple protrusions on the mold that match the grooves on the outsole, so that when installing the outsole, the protrusions can be inserted into the grooves, thus stably fixing the outsole and avoiding displacement or warping of the outsole during the pouring process. However, since it is necessary to manually fit the grooves on the outsole and the protrusions on the mold one by one during the installation of the outsole, this installation method is rather troublesome and is prone to improper installation. In addition, after the outsole is produced, due to reasons such as thermal expansion and contraction, there may be slight deformation at the bottom of the outsole. After slight deformation occurs at the bottom of the outsole, it is very easy to cause the grooves on the outsole and the protrusions on the mold not to be fitted one by one, so that the outsole cannot be stably fixed, resulting in the midsole not being accurately poured on the outsole during the subsequent pouring process, and the integrity and stability of the bonding between the midsole and the outsole are not good enough.

[0007] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0008] Aiming at the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a method and a mold for pouring a polyurethane outsole at the bottom of a midsole. By providing a glue injection chamber below the midsole during pouring, it is possible to pour the outsole after positioning the midsole, thereby eliminating the step of positioning the outsole during the pouring process, and avoiding the situation of outsole displacement during positioning. Finally, the integrity and stability of the bonding between the midsole and the outsole of the poured shoe sole can be ensured.

[0009] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0010] A method for pouring a polyurethane outsole at the bottom of a midsole, comprising the following steps:

[0011] S1. Heat the upper mold and the lower mold of the mold;

[0012] S2. Place the produced foamed polyurethane midsole in the preset position of the lower mold and position it well;

[0013] S3. Close the upper mold and the lower mold, inflate the airbag so that it abuts against the midsole and presses the midsole tightly against the preset position of the lower mold, and a glue injection chamber is correspondingly formed below the midsole;

[0014] S4. Inject the material of the outsole into the glue injection chamber;

[0015] S5. Cure;

[0016] S6. Open the mold to obtain a sole in which the foamed polyurethane midsole and the thermoplastic polyurethane outsole are connected to each other;

[0017] By positioning the midsole first and then casting the outsole, the step of positioning the outsole can be omitted during the casting process, and finally the fitting integrity and stability between the midsole and the outsole of the cast sole can be ensured.

[0018] Furthermore, in step S1, the heating temperature is 50°C - 70°C; in step S4, the glue injection time is 8 - 15 seconds; in step S5, the curing time is 680 - 750 seconds.

[0019] Furthermore, in step S1, the mold includes a mutually cooperating upper mold, a lower mold, and an inflatable airbag; a large sole station is provided at the top of the lower mold, and a limiting member for limiting the midsole is provided on the outer side around the large sole station; limiting strips protruding upward are respectively provided at the four peripheral edges of the large sole station, so that after the midsole is installed, the limiting strips can be used to abut against the four peripheries of the bottom surface of the midsole, thereby forming a glue injection chamber between the midsole, the limiting strips, and the large sole station; a glue injection channel communicating with the glue injection chamber is also provided on the lower mold, so that the outsole can be formed by injecting glue into the glue injection chamber; the airbag is installed at the bottom of the upper mold, and the bottom surface of the airbag can be used to fitly adhere to the top surface of the midsole to form a downward pressing force on the midsole.

[0020] Furthermore, the lower mold includes a first mold and a second mold that are vertically distributed and detachably connected; the glue injection channel includes a first channel that penetrates downward to the bottom surface of the first mold, a second channel provided between the first mold and the second mold and communicating with the first channel, and a third channel that penetrates upward to the glue injection chamber and communicates with the second channel. The detachable design of the first mold and the second mold is beneficial for convenient production and cleaning of the glue injection channel, and can avoid blockage of the channel and so on.

[0021] The present invention also provides a mold that can be used to pour a thermoplastic polyurethane outsole at the bottom of a midsole, and it adopts the method for pouring a thermoplastic polyurethane outsole at the bottom of a midsole as described above; the mold that can be used to pour a thermoplastic polyurethane outsole at the bottom of a midsole includes a cooperating upper mold, a lower mold, and an inflatable airbag; a sole station is provided at the top of the lower mold, and a limiting member for limiting the midsole is provided on the outer side around the sole station; limiting ribs protruding upward are further provided on the four peripheral edges of the sole station, so that after the midsole is installed, the limiting ribs can be used to abut against the four peripheries of the bottom surface of the midsole, thereby forming a glue injection chamber between the midsole, the limiting ribs, and the sole station; a glue injection channel communicating with the glue injection chamber is further provided on the lower mold, so that the sole can be finally formed by injecting glue into the glue injection chamber; the airbag is installed at the bottom of the upper mold, and the bottom surface of the airbag can be used to fitly adhere to the top surface of the midsole, so as to form a downward pressing force on the midsole; by providing a glue injection chamber below the midsole, it is possible to pour a thermoplastic polyurethane outsole after positioning the foamed polyurethane midsole, thereby eliminating the step of positioning the outsole during the pouring process, and finally ensuring the integrity and stability of the fit between the midsole and the outsole of the poured sole.

[0022] Further, the lower mold includes a first mold and a second mold that are vertically distributed and detachably connected; the sole station is located at the top of the first mold; the glue injection channel includes a first channel that penetrates downward to the bottom surface of the first mold, a second channel provided between the first mold and the second mold and communicating with the first channel, and a third channel that penetrates upward to the glue injection chamber and communicates with the second channel. The detachable design of the first mold and the second mold is beneficial for convenient production and cleaning of the glue injection channel, and can avoid blockage of the channel and the like.

[0023] Further, a protrusion is provided on the top surface of the second mold, and the second channel is correspondingly provided at the top surface position of the protrusion; a recess for the protrusion to fitly insert is provided on the bottom surface of the first mold, and the inlet of the third channel is located on the top surface of the recess. Through the above settings, the first channel, the second channel, and the third channel can be continuously interconnected, which is convenient for glue injection.

[0024] Further, both the protrusion and the recess are strip-shaped; the second channel is also correspondingly strip-shaped, and the extending direction of the second channel is the same as the extending directions of the protrusion and the recess; the outlet of the first channel communicates with one end of the second channel, and the inlet of the third channel communicates with the other end of the second channel. Through the above settings, the smooth flow of the material during pouring can be ensured.

[0025] Furthermore, the first mold and the second mold are detachably connected by bolts, thus ensuring the efficiency and convenience of disassembly and assembly.

[0026] Furthermore, the front and rear ends of the outsole station respectively extend upward in an arc shape toward the two outer ends; a plurality of limiting members are provided on both sides of the outsole station; an exhaust port for discharging internal air during the injection process is further provided at the front end of the injection cavity to ensure smoothness during the injection process.

[0027] The beneficial effects of the present invention are as follows:

[0028] (1) By cooperating with the limiting strip and the outsole station under the midsole, the present invention can form an injection cavity, so that the outsole can be cast after positioning the midsole, and then the step of positioning the outsole can be omitted during the casting process, and the situation of the outsole shifting during positioning will not occur. Finally, the integrity and stability of the fit between the midsole and the outsole of the cast sole can be ensured, which is beneficial to improving the yield rate.

[0029] (2) By providing an airbag for pressing the midsole, so that after the airbag is inflated, a downward pressing force on the midsole can be formed, which can make the midsole have a tendency to move downward and finally enable the outsole to be stably connected to the midsole during the molding process and is not prone to deformation.

[0030] (3) By dividing the lower mold into a first mold and a second mold, the present invention can facilitate the cleaning of the first channel, the second channel, and the third channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the overall structural schematic diagram of the present invention Figure 1 ;

[0032] Figure 2 is the overall structural schematic diagram of the present invention Figure 2 ;

[0033] Figure 3 is the overall structural schematic diagram of the present invention Figure 3 ;

[0034] Figure 4 is the exploded view of the present invention Figure 1 ;

[0035] Figure 5 is the exploded view of the present invention Figure 2 ;

[0036] Figure 6 is the schematic diagram of the bottom surface structure of the first mold of the present invention;

[0037] Figure 7 is the schematic diagram of the top surface structure of the second mold of the present invention;

[0038] Figure 8 It is a schematic diagram of a partial structure of the present invention.

[0039] Reference numerals

[0040] 1. Upper mold; 2. Lower mold; 201. First mold; 2011. Concave position; 202. Second mold; 2021. Protrusion; 21. Outsole station; 22. Limit bar; 23. Glue injection channel; 231. First channel; 232. Second channel; 233. Third channel; 24. Exhaust port; 25. Limiting member; 3. Airbag; 4. Midsole; 5. Limit frame. Detailed implementation manners

[0041] The following further elaborates on the invention in conjunction with the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the protection scope of the invention.

[0042] As Figures 1-8 shown, a method for pouring a thermoplastic polyurethane outsole at the bottom of a midsole includes the following steps:

[0043] S1. Heat the upper mold 1 and the lower mold 2 of the mold;

[0044] S2. Place the produced foamed polyurethane midsole 4 into the preset position of the lower mold 2 and position it;

[0045] S3. Close the upper mold 1 and the lower mold 2, inflate the airbag 3 so that it abuts against the top of the midsole 4 and press the midsole 3 tightly in the preset position of the lower mold, and a glue injection chamber (not marked in the figure) is correspondingly formed below the midsole 4;

[0046] S4. Inject the material for the outsole into the glue injection chamber;

[0047] S5. Cure;

[0048] S6. Open the mold to obtain a shoe sole in which the foamed polyurethane midsole 4 and the thermoplastic polyurethane outsole are connected to each other.

[0049] Specifically, in step S1, the heating temperature is 50°C - 70°C. In step S4, the glue injection time is 8 - 15 seconds. In this embodiment, in order to ensure the glue injection amount, the glue injection time can be specifically set to 10 seconds. In step S5, the curing time is 680 - 750 seconds. In this embodiment, in order to ensure the curing effect, the fixing time can be specifically set to 700 seconds. Through the data set in the above steps, it is possible to ensure that the desired outsole is poured.

[0050] In step S1, for the mold used in the above method, it specifically includes a matching upper mold 1, a lower mold 2, and an inflatable airbag 3. The following is a detailed discussion:

[0051] As Figures 3-8 shown, preferably, a large sole station 21 is provided at the top of the lower mold 2, and a limiting member 25 for limiting the midsole 4 is provided on the outer side around the large sole station 21, so that the midsole 4 can be stably installed at the preset position of the mold to ensure the position accuracy of the midsole 4 during subsequent pouring.

[0052] As Figures 3-8 shown, preferably, limiting ribs 22 protruding upward are further provided at the four peripheral edges of the large sole station 21. After the midsole 4 is installed, the limiting ribs 22 can be used to abut against the four sides of the bottom surface of the midsole 4, so as to form a glue injection chamber (not marked in the figure) between the midsole 4, the limiting ribs 22 and the large sole station 21. Of course, the shape and size of the glue injection chamber correspond to the shape and size of the large sole to be molded, so as to ensure that the molded large sole does not have external defects.

[0053] As Figure 2 shown, specifically, a glue injection channel 23 communicating with the glue injection chamber is further provided on the lower mold 2, so that the large sole can be molded by injecting glue into the glue injection chamber.

[0054] As Figures 4-5 shown, for the structure of the airbag 3, the airbag 3 is installed at the bottom of the upper mold 1, and the bottom surface of the airbag 3 can be used to fitly adhere to the top surface of the midsole 4, so that after inflation, a downward pressing force on the midsole 4 can be formed, which can make the midsole 4 keep a downward moving trend and can be pressed tightly on the lower mold 2. Finally, the large sole can be stably connected to the midsole 4 during the molding process and is not easily deformed. In addition, in this design, since the airbag 3 has a certain softness, it can be specifically made of silicone or rubber, so that the airbag 3 can apply very uniform pressure to each position of the midsole 4 after inflation, to ensure the subsequent pouring effect of the large sole and avoid the large sole being deformed due to the deformation of the midsole 4. Therefore, it can ensure the fitting degree between the large sole and the midsole 4 and also ensure the yield rate.

[0055] As Figures 1-8As shown, preferably, the lower mold 2 includes a first mold 201 and a second mold 202 which are distributed vertically and detachably connected; the glue injection channel 23 includes a first channel 231 that penetrates downward to the bottom surface of the first mold 201, a second channel 232 disposed between the first mold 201 and the second mold 202 and communicating with the first channel 231, and a third channel 233 that penetrates upward to the glue injection chamber and communicates with the second channel 232. By dividing the lower mold 2 into the first mold 201 and the second mold 202, the production and manufacturing of the lower mold 2 can be facilitated. In addition, since the second channel 232 is located between the first mold 201 and the second mold 202, after disassembling the first mold 201 and the second mold 202 from each other, it is convenient to clean the position of the second channel 232 to prevent materials from remaining at the position of the second channel 232 and affecting the subsequent pouring effect. Of course, the detachable design of the first mold 201 and the second mold 202 is also beneficial for cleaning the first channel 231 and the third channel 233 in detail. Because after disassembling the first mold 201 and the second mold 202, it is convenient to observe the internal conditions of the first channel 231 and the third channel 233, and thus it is convenient to clean. It can be seen that the detachable design of the first mold 201 and the second mold 202 can facilitate production and manufacturing and cleaning of the glue injection channel 23, and avoid blockage of the channel and so on.

[0056] In addition, the present invention also provides a mold that can be used for pouring a polyurethane outsole at the bottom of a midsole, which adopts the above method for pouring a polyurethane outsole at the bottom of a midsole, specifically as follows:

[0057] The mold that can be used for pouring a polyurethane outsole at the bottom of a midsole includes a cooperating upper mold 1, a lower mold 2, and an inflatable airbag 3.

[0058] As Figures 3-8 shown, preferably, a outsole station 21 is provided at the top of the lower mold 2, and a limiting member 25 for limiting the midsole 4 is provided on the outer side around the outsole station 21, so that the midsole 4 can be stably installed at the preset position of the mold to ensure the position accuracy of the midsole 4 during subsequent pouring.

[0059] As Figures 3-8 shown, preferably, limiting ribs 22 protruding upward are further provided at the four peripheral edges of the outsole station 21. After installing the midsole 4, the limiting ribs 22 can be used to abut against the periphery of the bottom surface of the midsole 4, so as to form a glue injection chamber (not marked in the figure) between the midsole 4, the limiting ribs 22 and the outsole station 21. Of course, the shape and size of the glue injection chamber correspond to the shape and size of the outsole to be formed to ensure that the formed outsole does not have external defects.

[0060] As Figure 2As shown, specifically, a glue injection channel 23 communicating with the glue injection chamber is further provided on the lower mold 2 so that the sole can be finally formed by injecting glue into the glue injection chamber.

[0061] As Figures 4-5 shown, for the structure of the airbag 3, the airbag 3 is installed at the bottom of the upper mold 1 and the bottom surface of the airbag 3 can be used to fitly adhere to the top surface of the midsole 4 so that a downward pressing force on the midsole 4 can be formed after inflation, which can make the midsole 4 tend to move downward and be pressed tightly on the lower mold 2. Finally, the sole can be stably connected to the midsole 4 during the forming process, and at the same time, it is not easy to deform. Similarly, according to the above description, the setting of the airbag 3 can ensure the fitting degree between the sole and the midsole 4 and also ensure the yield rate.

[0062] Preferably, for the fixing method of the airbag 3, a plurality of through holes evenly distributed around can be provided, and then bolts (not shown in the figure) for connecting with the upper mold 1 are installed in each through hole. In this way, the airbag 3 can be installed on the upper mold 1 by using the connection between the bolts and the upper mold 1. In addition, the inner cavity of the airbag 3 is open at the upper end, and an inflation port (not shown in the figure) for inflating the airbag 3 is further provided on the top surface of the upper mold 1 to facilitate inflation of the airbag 3.

[0063] As Figure 5 shown, in order to make the airbag 3 mainly expand longitudinally when it expands, a limiting frame 5 installed on the upper mold 1 can be sleeved around the airbag 3 to limit the expansion of the airbag 3 in the horizontal direction and avoid insufficient acting force when the airbag 3 presses the midsole 4 due to excessive expansion in the horizontal direction. That is, the above design can make the airbag 3 press on the midsole 4 stably and with a certain force.

[0064] As Figures 1-8 shown, preferably, the lower mold 2 includes a first mold 201 and a second mold 202 which are distributed up and down and detachably connected; the sole station 21 is located at the top of the first mold 201; the glue injection channel 23 includes a first channel 231 penetrating from top to bottom to the bottom surface of the first mold 201, a second channel 232 provided between the first mold 201 and the second mold 202 and communicating with the first channel 231, and a third channel 233 penetrating from bottom to top to the glue injection chamber and communicating with the second channel 232. Similarly, according to the above description, the detachable design of the first mold 201 and the second mold 202 is beneficial to facilitate production and cleaning of the glue injection channel 23 and avoid blockage of the channel.

[0065] As Figure 2 、 Figure 4 and Figure 6As shown, preferably, a protrusion 2021 is provided on the top surface of the second mold 202, and the second channel 232 is correspondingly provided at the top surface position of the protrusion 2021; a recess 2011 for mating insertion of the protrusion 2021 is provided on the bottom surface of the first mold 201, and the inlet of the third channel 233 is located on the top surface of the recess 2011. Therefore, after the above settings, the first channel 231, the second channel 232 and the third channel 233 can be connected to each other coherently, facilitating glue injection.

[0066] As Figure 2 , Figure 4 and Figure 6 shown, in this embodiment, both the protrusion 2021 and the recess 2011 are strip-shaped; the second channel 232 is also correspondingly strip-shaped, and the extending direction of the second channel 232 is the same as the extending directions of the protrusion 2021 and the recess 2011; the outlet of the first channel 231 communicates with one end of the second channel 232, and the inlet of the third channel 233 communicates with the other end of the second channel 232. The strip-shaped protrusion 2021 can be used to conveniently set the second channel 232 to be strip-shaped correspondingly, so that there is a certain pre-stored material space when the material enters the second channel 232 from the first channel 231, so that the material can flow very smoothly.

[0067] In this embodiment, the first mold 201 and the second mold 202 are detachably connected by bolts, so as to ensure the efficiency and convenience of disassembly and assembly.

[0068] As Figure 7 and Figure 8 shown, preferably, in order to adapt to the bottom shape of the outsole, the front and rear ends of the outsole station 21 are respectively arc-shaped and extend upward in the direction of both ends; a plurality of limiting members 25 are provided on both sides of the outsole station 21.

[0069] As Figure 7 and Figure 8 shown, in this embodiment, the radian of the front end of the outsole station 21 is greater than the radian of its rear end. However, those skilled in the art should know that for the two ends of the outsole station 21, he can also set the radian according to actual needs, which will not be specifically described here.

[0070] As Figure 4 and Figure 7 shown, preferably, an exhaust port 24 for discharging internal air during glue injection is further provided at the front end of the glue injection chamber to ensure smoothness during glue injection.

[0071] As Figure 7As shown, preferably, there are multiple protruding and multiple concave forming structures on the surface of the outsole station 21, so as to form corresponding concave and convex structures on the bottom surface of the molded outsole, ensuring the anti-slip effect at the bottom of the outsole. In addition, in order to ensure that the airbag 3 can stably press the midsole 4, the bottom surface pattern of the airbag 3 can also be matched with the pattern on the top surface of the midsole 4.

[0072] To improve production efficiency, the outsole station 21 can be set to two. Of course, the injection channels 23, the limit members 25, etc. also need to be correspondingly set to two sets to ensure the use effect.

[0073] In this embodiment, the hardness of the midsole 4 is less than that of the outsole.

[0074] When the above-mentioned mold is in use, first place the midsole 4 between the respective limit members 25 and the bottom surface abuts against the limit stop strip 22 correspondingly. At this time, a pouring chamber is formed below the midsole 4. Then, after closing the mold, inflate the airbag 3 and make it press against the top surface of the midsole 4 in a matching manner, inject glue into the pouring chamber, and then perform curing and open the mold to obtain a shoe sole including a foamed polyurethane midsole and a thermoplastic polyurethane outsole.

[0075] In summary, by cooperating with the limit stop strip 22 and the outsole station 21 below the midsole 4, the present invention can form a pouring chamber, so as to be able to pour the outsole after positioning the midsole 4, and thus the step of positioning the outsole can be omitted during the pouring process, and the situation of the outsole shifting during positioning will not occur. Finally, the integrity and stability of the fit between the midsole 4 and the outsole of the poured shoe sole can be ensured, which is beneficial to improving the yield rate.

[0076] The present invention is not limited to the above embodiments. If various modifications or deformations of the present invention do not depart from the spirit and scope of the present invention, and if these modifications and deformations fall within the scope of the claims of the present invention and equivalent technical scope, then the present invention also intends to include these modifications and deformations.

Claims

1. A method for pouring a polyurethane outsole at the bottom of a midsole, characterized in that, The steps are as follows: S1. Heat the upper mold and the lower mold of the die; S2. Place the produced foamed polyurethane midsole into the preset position of the lower mold and position it well; S3. Close the upper mold and the lower mold, inflate the airbag so that it abuts against the top of the midsole and presses the midsole tightly in the preset position of the lower mold, and a glue injection chamber is correspondingly formed below the midsole; S4. Inject the material for the outsole into the said glue injection chamber; S5. Cure; S6. Open the mold to obtain a sole in which the foamed polyurethane midsole and the thermoplastic polyurethane outsole are connected to each other; By positioning the midsole and then casting the outsole, the step of positioning the outsole can be omitted during the casting process, and finally the fitting integrity and stability between the midsole and the outsole of the cast sole can be ensured.

2. The method for casting a polyurethane outsole at the bottom of a midsole according to claim 1, wherein: In step S1, the heating temperature is 50°C - 70°C; In step S4, the glue injection time is 8 - 15 seconds; In step S5, the curing time is 680 - 750 seconds.

3. The method for casting a polyurethane outsole at the bottom of a midsole according to claim 1, wherein: In step S1, the die includes a mutually cooperating upper mold, a lower mold and an inflatable airbag; A outsole station is provided at the top of the lower mold, and a limiting member for limiting the midsole is provided on the outer side around the outsole station; Limiting stop strips protruding upward are further provided at the four peripheral edges of the outsole station, so that after the midsole is installed, the limiting stop strips can be used to abut against the four peripheries of the bottom surface of the midsole, thereby forming a glue injection chamber between the midsole, the limiting stop strips and the outsole station; A glue injection channel communicating with the glue injection chamber is further provided on the lower mold, so that glue can be injected into the glue injection chamber and finally an outsole can be formed; The airbag is installed at the bottom of the upper mold, and the bottom surface of the airbag can be used to fitly adhere to the top surface of the midsole to form a downward pressing force on the midsole.

4. The method for casting a polyurethane outsole at the bottom of a midsole according to claim 3, wherein: The lower mold includes a first mold and a second mold which are distributed up and down and are detachably connected; the glue injection channel includes a first channel penetrating from top to bottom to the bottom surface of the first mold, a second channel provided between the first mold and the second mold and communicating with the first channel, and a third channel penetrating from bottom to top to the glue injection chamber and communicating with the second channel.

5. A mold that can be used for pouring a polyurethane outsole at the bottom of a midsole, characterized in that, It adopts the method for casting a polyurethane outsole at the bottom of a midsole according to any one of claims 1 - 4; The die for casting a polyurethane outsole at the bottom of a midsole includes a mutually cooperating upper mold, a lower mold and an inflatable airbag; A outsole station is provided at the top of the lower mold, and a limiting member for limiting the midsole is provided on the outer side around the outsole station; At the four peripheral edges of the outsole station, there are also upwardly protruding limiting strips respectively, so that after installing the midsole, the limiting strips can be used to abut against the four peripheries of the bottom surface of the midsole, thereby forming a glue injection chamber between the midsole, the limiting strips and the outsole station; On the lower mold, there is also a glue injection channel communicating with the glue injection chamber, so that the outsole can be finally formed by injecting glue into the glue injection chamber; The airbag is installed at the bottom of the upper mold, and the bottom surface of the airbag can be used to fitly adhere to the top surface of the midsole, so as to form a downward pressing force on the midsole; By arranging a glue injection chamber below the midsole, it is possible to pour out the thermoplastic polyurethane outsole after positioning the foamed polyurethane midsole, thereby omitting the step of positioning the outsole during the pouring process, and finally ensuring the integrity and stability of the fit between the midsole and the outsole of the poured sole.

6. The mold for pouring polyurethane outsole at the bottom of the midsole according to claim 5, characterized in that: The lower mold includes a first mold and a second mold which are distributed up and down and are detachably connected; the outsole station is located at the top of the first mold; the glue injection channel includes a first channel penetrating from top to bottom to the bottom surface of the first mold, a second channel arranged between the first mold and the second mold and communicating with the first channel, and a third channel penetrating from bottom to top to the glue injection chamber and communicating with the second channel.

7. The mold for pouring polyurethane outsole at the bottom of the midsole according to claim 6, characterized in that: There is a protrusion on the top surface of the second mold, and the second channel is correspondingly arranged at the top surface position of the protrusion; there is a recess on the bottom surface of the first mold for the protrusion to fitly insert, and the inlet of the third channel is located on the top surface of the recess.

8. The mold for pouring polyurethane outsole at the bottom of the midsole according to claim 7, characterized in that: Both the protrusion and the recess are strip-shaped; the second channel is also correspondingly strip-shaped, and the extending direction of the second channel is the same as the extending directions of the protrusion and the recess; the outlet of the first channel communicates with one end of the second channel, and the inlet of the third channel communicates with the other end of the second channel.

9. The mold for pouring polyurethane outsole at the bottom of the midsole according to claim 6, characterized in that: The first mold and the second mold are detachably connected by bolts.

10. The mold for pouring polyurethane outsole at the bottom of the midsole according to claim 1, characterized in that: The front and rear ends of the outsole station are respectively upwardly arcuately extended in the directions of both ends; there are a plurality of limiting members distributed on both sides of the outsole station; At the front end of the glue injection chamber, there is also an exhaust port for discharging the internal air during the glue injection process.

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