Manufacturing method of ETPU environment-friendly sole

Abstract

The invention relates to the technical field of environment-friendly shoe soles, and provides an ETPU environment-friendly shoe sole manufacturing method which comprises the following steps that S1, ETPU waste materials are recycled and screened, specifically, the screened ETPU waste materials comprise waste ETPU shoe soles or leftover materials generated in the ETPU shoe sole production process, and whether the waste materials are coked or not serves as a judgment criterion for screening; s2, crushing treatment is conducted, specifically, the screened waste materials are conveyed into a crushing device to be crushed into crushed particles within 10 mm; s3, mixing of new materials and old materials, wherein a proper amount of ETPU new materials are mixed and added into the crushed particles, and the mixed ETPU new materials account for 20%-40%; s4, steam forming treatment: conveying the mixed new and old materials into a forming machine for steam forming; s5, cooling, forming and demolding are conducted, and the needed ETPU environment-friendly shoe sole is obtained. The environment-friendly shoe sole recycling device has the beneficial effect that the environment-friendly property during waste shoe sole recycling is improved.

Description

Technical Field

[0001] The present application relates to the technical field of environmentally friendly soles, and in particular to a method for manufacturing ETPU environmentally friendly soles. Background Art

[0002] In today's society where people's living standards are improving, sports, travel and leisure have become an indispensable part of everyone's life. Sports shoes are soft, breathable, elastic, and beautiful in appearance. They are not only suitable for wearing in sports such as basketball and running to achieve the purpose of cushioning and shock absorption and avoiding ankle and knee injuries, but can also be worn in social, travel and other leisure and entertainment occasions, which are both fashionable and comfortable. With the increasing production capacity and consumption of sports shoes, a large number of defective foam soles, foam sole scraps, excess foam soles caused by unreasonable production scheduling, and waste foam soles of sports shoes are produced in the production and consumption links. If they are discarded or incinerated at will, it will cause serious environmental pollution and waste of resources.

[0003] In this regard, the waste soles are currently recycled. For the recycling of waste soles, some people choose to crush the discarded foam soles and then glue them together. Since the glue used generally contains solvents, the evaporation of the solvent will also cause pollution to the environment, so further improvement is needed. Summary of the invention

[0004] In order to improve the environmental friendliness when recycling waste soles, the present application provides a method for making ETPU environmentally friendly soles.

[0005] The present application provides a method for manufacturing an ETPU environmentally friendly sole, which adopts the following technical solution: A method for making an ETPU environmentally friendly sole comprises the following steps: Step S1: Recovering and screening ETPU waste: The screened ETPU waste includes discarded ETPU soles or scraps generated during the production of ETPU soles, etc. The screening is based on whether the waste has coking phenomenon as the judging criterion; Step S2: Crushing: The screened waste is transported to the crushing device (1) and crushed into particles within 10 mm; Step S3: Mixing new and old materials: Add an appropriate amount of ETPU new material to the crushed particles, and the proportion of the mixed ETPU new material is 20%-40%; Step S4: steam molding: conveying the mixed new and old materials to the molding machine (3) for steam molding; Step S5: Cooling and demoulding to obtain the desired ETPU environmentally friendly sole.

[0006] By adopting the above technical solution, first of all, it is necessary to screen out the ETPU waste with coking phenomenon. For the shoe materials with coking phenomenon, it is usually caused by high temperature and oxidation, which causes the waste to deteriorate and discolor. After the subsequent steam molding, it will affect the quality of the shoe materials produced, so it needs to be screened out. Then, the ETPU waste after screening is crushed into broken particles within 10mm by a crushing device, and then mixed with ETPU new materials in proportion. Since the old materials will be broken into irregular shapes, pores will be generated during steam molding in the molding machine, thereby reducing the density of the sole. For this, by adding ETPU new materials, since the size of the new materials is constant, the pores are filled in the steam molding process after mixing to reduce the possibility of holes after the sole is molded, so as to improve the quality of the sole molding, and further improve the performance of the recycled sole. Then cool the molding and demould to obtain the required ETPU environmentally friendly sole.

[0007] Compared with the prior art of bonding broken particles by glue, the above method is more environmentally friendly and can reduce pollution to the outside air. The molding method is also relatively simple and the quality of the sole is also guaranteed.

[0008] Preferably, in step S2, screening is required during crushing in the crushing device to screen out the crushed particles with a crushing diameter of 5-10 mm for the operation of step S3.

[0009] By adopting the above technical scheme, the crushed waste is further screened to screen out crushed particles with a diameter of 5-10 mm for the operation of step S3. Mainly, during the crushing process in the crushing device, the diameter of some crushed particles may be too small. If this part is mixed with new materials and steam-formed, the quality of the environmentally friendly soles may be reduced. Further screening is needed to ensure the quality of the environmentally friendly soles.

[0010] Preferably, in step S3, the mixed ETPU new material accounts for 30%.

[0011] By adopting the above technical solution and selecting ETPU new material to account for 30%, the density of the environmentally friendly sole obtained by steam molding can be achieved while reducing the cost of new materials.

[0012] Preferably, in step S4, the steam pressure of the secondary sintering is increased by 0.3-0.7 MPa based on the original steam pressure conditions of ETPU, and the steam molding time is increased by about 20-40S.

[0013] By adopting the above technical solution, since recycling and remolding is essentially a secondary sintering of ETPU crushed materials, the time and steam pressure required are increased compared to the soles molded from new materials. Since steam molding is performed on mixed new and old materials, the proportion of the mixed new materials is different, and the steam pressure and molding time required are different. With the increase of steam pressure and steam molding time, the adhesion effect between new and old materials will be increased to improve the filling effect between pores, thereby improving the quality and performance of the sole.

[0014] Preferably, in step S3, the crushed particles and the new materials are mixed by a mixing device, the mixing device comprises a tank body, a mixing barrel built in the tank body, a storage bin arranged on the top of the tank body, a feeding pipe connected to the storage bin, a stirring shaft built in the mixing barrel, and a driving component arranged in the tank body to drive the mixing barrel to rotate; the storage bin and the feeding pipe are both provided with a plurality of storage bins and a plurality of feeding pipes, the storage bin is used to store crushed particles or new materials, the feeding pipe extends into the mixing barrel, the mixing barrel is connected with a discharge pipe, the discharge pipe is rotatably penetrated through the bottom wall of the tank body, the feeding pipe and the discharge pipe are both provided with control valves, and the mixing barrel is provided with an adjusting component for changing the height position of the discharge end of the feeding pipe.

[0015] By adopting the above technical solution, a storage bin is used to store broken grains or new materials, and the corresponding weight or volume of broken grains and new materials are transported to the mixing barrel through the control valve according to the demand, and the driving component is started to drive the mixing barrel to rotate, so that the position of the feeding pipe in the mixing barrel is different, so that there is a certain mixing between the broken grains and the new materials, so that preliminary mixing is performed when feeding, so as to reduce the time spent on subsequent stirring through the stirring shaft and the possibility of surface damage of the broken grains or new materials due to the stirring of the stirring shaft. Since the mass of the broken grains and the new materials is relatively light, when they fall, if the height difference is large, the mixing effect between the broken grains and the new materials at the bottom may be poor. In order to improve the mixing effect, an adjustment component is provided to change the height position of the discharge end of the feeding pipe.

[0016] Preferably, the adjusting assembly includes a screw arranged in the middle of the mixing barrel to rotate together with the mixing barrel and a connecting ring threadedly connected to the screw, the axis of the screw is coaxially arranged with the axis of the mixing barrel, the feeding pipe includes a first tube connected to the storage bin and a second tube connected to the first tube and can be telescopic, and the connecting ring is connected to a plurality of second tubes.

[0017] By adopting the above technical solution, since the axis of the screw is coaxially arranged with the axis of the mixing barrel and the screw rotates together with the rotation of the mixing barrel, and the connecting ring threadedly connected to the screw is connected to a plurality of second tubes to move along the height direction of the screw, so that the second tube that can be telescoped on the first tube can be telescoped to gradually increase the feeding height of the feeding tube during the feeding process, the structure of the arranged adjustment component is relatively simple, thereby reducing the need to set up other driving sources to change the feeding height position of the feeding tube.

[0018] Preferably, the second tube is a telescopic tube, and the second tube includes a plurality of interconnected folding rings, and two adjacent folding rings are staggered with each other. The two adjacent folding rings can be bent along the connection, and the folding ring close to the bottom wall of the mixing barrel is connected to the connecting ring.

[0019] By adopting the above technical solution, the second tube is arranged as a telescopic tube, which is specifically connected by two folding rings arranged alternately with each other. Since the folding rings and the connecting rings are connected, when the screw rotates to drive the connecting rings to rise and fall, tension or pressure is applied to the folding rings, thereby performing stretching, expansion or compression operations respectively, thereby changing the length of the second tube to adapt to the change in the height position of the discharge material.

[0020] Preferably, the feed pipe also includes an inner liner tube arranged in the telescopic tube and a storage ring arranged outside the first tube; the inner liner tube is elastic, and includes a plurality of connecting sleeves and an elastic airbag arranged between adjacent connecting sleeves, the elastic airbag has a cavity for accommodating a medium, the connecting sleeve is provided with a channel connected to the cavity, the elastic airbag includes a first elastic band arranged close to the telescopic tube and a second elastic band connected to the first elastic band and arranged away from the telescopic tube, the hardness of the first elastic band is less than that of the second elastic band, the storage ring is used for storing the medium, and the storage ring is connected to the channel provided on the connecting sleeve; when the telescopic tube is unfolded, the inner liner tube is pulled into a taut state.

[0021] By adopting the above technical solution, since the second tube is a telescopic tube, its inner wall is relatively uneven, and the crushed grains and new materials being transported may be stuck in the space formed between two adjacent folding rings, thereby affecting the subsequent feeding. In this regard, an inner liner tube is provided. Since the inner liner tube specifically includes a connecting sleeve and an elastic airbag, the inner surface of the elastic ring is flat, and since the elastic airbag is connected by the first elastic band and the second elastic band to form an elastic airbag with a cavity, and since the hardness of the first elastic band is less than that of the second elastic band, the first elastic band is relatively easy to deform. Therefore, the inner wall of the inner liner tube is relatively flat, which can reduce the possibility of crushed grains or new materials being stuck on the second tube during transportation. When the connecting ring rises, the telescopic tube is compressed, and the pulling force on the inner liner tube is small at this time, and the stretching of the airbag is small at this time, and the medium originally located in the cavity will exert pressure on the first elastic band to move toward the space after the two folding rings are folded, thereby reducing the squeezing of the second elastic band, and the excess medium will also flow into the storage ring along the channel for storage, so that the inner wall of the inner liner tube is relatively flat during the extension or compression of the second tube, so as to reduce the impact on the transportation of broken materials or new materials.

[0022] Preferably, the first elastic band is arranged between the spaces formed by the two folding rings, and the first elastic band is connected to the two folding rings.

[0023] By adopting the above technical solution, since the first elastic band is connected to the two folding rings, it can move toward the folding rings as the folding rings are folded, thereby providing corresponding space for the medium and reducing the possibility of the second elastic band bulging in the direction away from the first elastic band, thereby improving the smoothness of the inner wall of the liner tube.

[0024] In summary, this application has the following beneficial effects: 1. Compared with the prior art of bonding broken particles with glue, this method is more environmentally friendly and can reduce pollution to the outside air. The molding method is also relatively simple, and the quality of the sole is also guaranteed.

[0025] 2. The storage bin is used to store broken grains or new materials, and the corresponding weight or volume of broken grains and new materials are transported to the mixing barrel through the control valve according to the needs. The driving component is started to drive the mixing barrel to rotate, so that the position of the feeding pipe in the mixing barrel is different, so that there is a certain mixing between the broken grains and the new materials, so as to reduce the time spent on subsequent stirring through the stirring shaft and the possibility of surface damage of the broken grains or new materials due to the stirring of the stirring shaft. Since the mass of the broken grains and new materials is relatively light, when they fall, if the height difference is large, the mixing effect between the broken grains and the new materials at the bottom may be poor. In order to improve the mixing effect, an adjustment component is provided to change the height position of the discharge end of the feeding pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a schematic diagram of the internal structure of the mixing device in Example 1 of the present application; Figure 3 is another structural schematic diagram of the second tube in Example 1 of the present application; Figure 4 is a schematic diagram of the structure of the second tube after folding in Example 1 of the present application; Figure 5 It is a schematic diagram of the structure of the liner pipe in Example 2 of the present application.

[0027] Explanation of the reference numerals: 1. Crushing device; 2. Mixing device; 21. Tank body; 211. Support leg; 212. Tank cover; 22. Storage bin; 23. Mixing barrel; 231. Discharge pipe; 232. Connecting pipe; 233. Support rod; 234. Connecting seat; 24. Driving assembly; 241. Gear ring; 242. Driving gear; 243. Driving motor; 25. Feed pipe; 26. Stirring shaft; 3. Forming machine; 4. Control valve; 5. Adjusting assembly; 51. Screw; 52. Connecting ring; 6. First tube; 7. Second tube; 71. Folding ring; 72. Sliding ring; 8. Lining tube; 81. Connecting sleeve; 811. Channel; 82. Elastic airbag; 821. Cavity; 822. First elastic band; 823. Second elastic band; 9. Storage ring. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 , further details of this application are given.

[0029] The embodiment of the present application discloses a method for manufacturing an ETPU environmentally friendly sole.

[0030] Embodiment 1: A method for making an ETPU environmentally friendly sole comprises the following steps: Step S1: Recover ETPU waste and screen it: The screened ETPU waste includes discarded ETPU soles or scraps generated during the production of ETPU soles, etc. The screening is based on whether the waste has coking phenomenon as the criterion. The ETPU waste with coking phenomenon will be screened out first to reduce the impact on the quality of the produced shoe materials after subsequent steam molding.

[0031] Step S2: Crushing: The screened waste is conveyed to the crushing device 1 and crushed into particles within 10 mm. In this embodiment, the diameter of the crushed particles can be 5-10 mm to reduce the possibility that the crushed particles are too large, resulting in larger gaps in the subsequently formed soles and affecting the density, or the crushed particles are too small to affect the quality of the subsequently formed soles themselves.

[0032] Step S3: Mixing new and old materials: Add an appropriate amount of ETPU new material to the crushed particles through the mixing device 2. The proportion of the mixed ETPU new material is 20%-40%. The specific proportion of the mixed ETPU new material is 30%. It should be noted that this proportion can be expressed as volume fraction or in mass units, depending on the needs. In this embodiment, it is specifically described in terms of volume fraction.

[0033] Step S4: Steam molding: The mixed new and old materials are transported to the mold in the molding machine 3 for steam molding. It should be noted that since the recycling and remolding is essentially the secondary sintering of the ETPU crushed particles, the steam pressure and time of the molding need to be adjusted. For this, the steam pressure of the secondary sintering should be increased by 0.3-0.7MPa based on the original steam pressure of the ETPU, and the steam molding time should be increased by about 20-40S. For example, the steam pressure required for the original steam molding of ETPU is usually 5MPa, and the steam molding time is 180S, so the steam molding pressure of the ETPU crushed material is set to 5.5MPa, and the steam molding time is 210S.

[0034] Step S5: Cooling and demoulding to obtain the desired ETPU environmentally friendly sole.

[0035] Among them, the crushing device 1 and the molding machine 3 are both existing technologies and will not be described in detail here.

[0036] The mixing device 2 specifically includes a tank body 21 , a storage bin 22 , a mixing barrel 23 , a driving assembly 24 , a feeding pipe 25 and a stirring shaft 26 .

[0037] The bottom of the tank body 21 is fixedly connected with a support leg 211, the top of the tank body 21 is open, and the top of the tank body 21 is provided with a tank cover 212 for opening and closing the opening, and the tank cover 212 is detachably connected to the tank body 21 by a buckle. Since the buckle is a prior art, it is not described here. The storage bin 22 is provided on the upper surface of the tank cover 212, and there are several storage bins 22 and they are arranged at intervals around the axis of the tank cover 212. It should be noted that the number of storage bins 22 is not less than two, which are used to store broken grains and new materials respectively. In this embodiment, two storage bins 22 are specifically shown.

[0038] The mixing barrel 23 is built into the tank body 21, and the mixing barrel 23 is connected to a discharge pipe 231, which is rotatably arranged on the bottom wall of the tank body 21, and the discharge pipe 231 is rotatably connected to a connecting pipe 232, so as to transport the mixed material to the molding machine 3. In this embodiment, the inner bottom wall of the mixing barrel 23 is inclined downward toward the direction close to the discharge pipe 231, so as to transport the mixed crushed particles and new materials to the molding machine 3 for steam molding.

[0039] Among them, the driving component 24 is used to drive the mixing barrel 23 to rotate. In this embodiment, the driving component 24 specifically includes a ring gear 241 coaxially sleeved outside the discharge pipe 231, a driving gear 242 meshing with the ring gear 241, and a driving motor 243 coaxially arranged with the driving gear 242. The outer bottom wall of the tank body 21 is protrudingly provided with a mounting frame for fixing the driving motor 243.

[0040] The number of feed pipes 25 corresponds to the number of storage bins 22, and two feed pipes 25 are provided to transport the crushed grains and new materials into the tank body 21, respectively. The feed pipe 25 is fixedly penetrated through the lower end surface of the storage bin 22 to be connected to the storage bin 22, and the upper end of the feed pipe 25 is penetrated through the tank cover 212 and extends into the mixing barrel 23. In this embodiment, the inner wall of the storage bin 22 is inclined downward toward the direction close to the feed pipe 25 to facilitate material discharge. In this embodiment, control valves 4 are provided on the feed pipe 25 and the discharge pipe 231, and the control valve 4 is electrically connected to the host computer, which is used to control the flow of several control valves 4 to input the corresponding volume fraction of crushed grains and new materials and the output of the mixed materials according to the needs.

[0041] Since the weight of the crushed particles and the new material is relatively light, when they fall, if the height difference is large, the mixing effect between the crushed particles and the new material at the bottom may be poor. In order to improve the mixing effect, in this embodiment, an adjustment component 5 for changing the height position of the discharge end of the feed pipe 25 is provided in the mixing barrel 23. The adjustment component 5 specifically includes a screw 51 arranged in the middle of the mixing barrel 23 to rotate with the mixing barrel 23 and a connecting ring 52 threadedly connected to the screw 51. The axis of the screw 51 is coaxially arranged with the axis of the mixing barrel 23. The bottom inner wall of the mixing barrel 23 is fixedly connected with a support rod 233. The support rod 233 is provided with a plurality of support rods and is arranged at intervals around the axis of the mixing barrel 23. The support rod 233 is inclined. The upper end of the support rod 233 is fixedly connected with a connecting seat 234. The screw 51 can be fixedly connected to the connecting seat 234 by bolts.

[0042] The feed pipe 25 specifically includes a first pipe 6 connected to the storage bin 22 and a second pipe 7 connected to the first pipe 6 and capable of being extended and retracted. In this embodiment, the second pipe 7 is a telescopic pipe, and the adjustment component 5 specifically adjusts the telescopic length of the second pipe 7. The connecting ring 52 is fixedly connected to the lower end of the second pipe 7. Figure 3 As shown, it includes a plurality of folding rings 71 connected to each other, and two adjacent folding rings 71 are arranged alternately. The two adjacent folding rings 71 can be bent along the connection, and the folding ring 71 close to the bottom wall of the mixing barrel 23 is connected to the connecting ring 52. The second tube 7 can also be as shown in FIG. Figure 3 As shown, it specifically includes a plurality of sliding rings 72, and the diameters of the plurality of sliding rings 72 are different and gradually increase from the inside to the outside. The sliding ring 72 with a larger diameter is slidably sleeved on the sliding ring 72 with a smaller diameter. When the connecting ring 52 approaches the bottom wall of the mixing tube 23, the inner diameter of the second tube 7 gradually increases toward the bottom wall of the mixing tube, and the cross section of the second tube 7 is set in a trapezoidal shape. It is specifically set according to the needs. In this embodiment, it is specifically set as follows: Figure 2 Shown as shown.

[0043] The stirring shaft 26 is a stirring rod, which is fixedly connected to the outer peripheral wall of the screw 51, or is arranged between the connecting ring 52 and the second tube 7. The specific arrangement is based on the needs, and no further details are given here. The driving motor 243 is started to drive the driving gear 242, the gear ring 241, the discharge pipe 231 and the mixing barrel 23 to rotate in turn, so as to change the position of the crushed particles and the new material transported by the feed pipe 25, so as to mix the materials. The folded second tube 7 is as shown in FIG. Figure 4 shown.

[0044] Comparative Example Comparative Example 1: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that the size of the crushed particles is different. The size of the crushed particles in Comparative Example 1 is greater than 10 mm, specifically between 10-15 mm.

[0045] Comparative Example 2: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that the size of the crushed particles is different. The size of the crushed particles in Comparative Example 2 is less than 5 mm, specifically between 3-5 mm.

[0046] Comparative Example 3: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that no new ETPU material is mixed in Comparative Example 3.

[0047] Comparative Example 4: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that the proportion of the mixed ETPU new material is different. The volume fraction of the ETPU new material in Comparative Example 4 is 10%-20%.

[0048] Comparative Example 5: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that the proportion of the mixed ETPU new material is different. The volume fraction of the ETPU new material in Comparative Example 5 is 40%-60%.

[0049] Comparative Example 6: A method for making an ETPU environmentally friendly sole. The difference from Example 1 is that the mixing method is different. In Comparative Example 6, the crushed particles and the new material are directly poured into the tank at one time and stirred and mixed by a stirring shaft.

[0050] The following experiments were conducted on the above embodiments and comparative examples.

[0051] Under the same steam pressure and steam time, the corresponding soles were made according to the methods in the embodiment and the comparative example. Then, 10 soles made by the same method were selected to observe the appearance and quality of the made soles to score the appearance of the soles. The evaluation criteria are shown in Table 1. Finally, the average score is recorded in Table 2: score Appearance 0～3 Large pores and poor surface smoothness 3～7 The pores are relatively large and the appearance is relatively smooth. 8～10 Smaller pores and higher surface smoothness Table 1- Rating Criteria Appearance Rating Example 9.2 Comparative Example 1 6.8 Comparative Example 2 7.85 Comparative Example 3 5.7 Comparative Example 4 7.4 Comparative Example 5 9.4 Comparative Example 6 5.85 Table 2 - Experimental results record From the above-mentioned embodiment 1 and comparative examples 1-6, it can be seen from Table 2 that in comparative examples 1 and 2, only the size of the broken grains is changed. If the broken grains are too large or too small, the appearance of the sole will be affected. The main reason is that if the broken grains are too large or too small, the gap of the sole produced in the subsequent production will be larger, and the appearance flatness will be a little uneven, thereby affecting the compactness of the sole, that is, the quality of the sole will be affected. In comparative examples 3-5, the input ratio of the new material is changed. As the input of the new material increases, the gap of the sole can be gradually reduced, and the appearance flatness increases. However, it will be found that when the increase is greater than 40%, the change to the appearance of the sole is not much, and the amount of broken grains used is reduced a lot. In comparative example 6, because the direct disposable glue broken grains and the new material are poured into the tank body and stirred by the stirring shaft, the gaps of the sole formed in the subsequent production are large and small, and the distribution is relatively uneven, and the overall appearance score is reduced.

[0052] Embodiment 2: Reference Figure 5 , which is different from Example 1, is that the feed pipe 25 also includes an inner liner tube 8 arranged in the telescopic tube and a storage ring 9 arranged outside the first tube 6. In this embodiment, the inner liner tube 8 is elastic. The inner liner tube 8 specifically includes a plurality of connecting sleeves 81 and an elastic airbag 82 arranged between adjacent connecting sleeves 81. The elastic airbag 82 has a cavity 821 for accommodating a medium. The connecting sleeve 81 is provided with a channel 811 connected to the cavity 821. The elastic airbag 82 includes a first elastic band 822 arranged close to the telescopic tube and a second elastic band 823 connected to the first elastic band 822 and arranged away from the telescopic tube. The hardness of the first elastic band 822 is less than the hardness of the second elastic band 823, and the first elastic band 822 is arranged in an arc shape in the direction close to the folding ring 71. The first elastic band 822 is arranged between the spaces formed by the two folding rings 71, and the first elastic band 822 is connected to the two folding rings 71. The storage ring 9 is used to store the medium, and the storage ring 9 is connected to the channel 811 provided on the connecting sleeve 81; when the telescopic tube is unfolded, the liner tube 8 is pulled into a taut state.

[0053] It should be noted that the medium can be gas or liquid, which is set according to specific needs. Since the elastic airbag 82 has different changes, the size of the cavity 821 is different, and the amount of medium required is different. Therefore, the storage ring 9 can be connected to a pipeline for conveying or extracting the medium, and a control valve 4 is also provided on the pipeline to input or extract the medium.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for making an ETPU environmentally friendly sole, characterized in that: The following steps are involved: Step S1: Recovering and screening ETPU waste: The screened ETPU waste includes discarded ETPU soles or scraps generated during the production of ETPU soles, etc. The screening is based on whether the waste has coking phenomenon as the judging criterion; Step S2: Crushing: The screened waste is transported to the crushing device (1) and crushed into particles within 10 mm; Step S3: Mixing new and old materials: Add an appropriate amount of ETPU new material to the crushed particles, with the proportion of the mixed ETPU new material being 20%-40%; Step S4: steam molding: conveying the mixed new and old materials to the molding machine (3) for steam molding; Step S5: Cooling and demoulding to obtain the desired ETPU environmentally friendly sole.

2. The method for making an ETPU environmentally friendly sole according to claim 1, characterized in that: In the step S2, screening is required during the crushing process in the crushing device (1) so as to screen out the crushed particles with a crushing diameter of 5-10 mm for the operation of the step S3.

3. The method for making an ETPU environmentally friendly sole according to claim 1, characterized in that: In step S3, the proportion of the mixed ETPU new material is specifically 30%.

4. The method for making an ETPU environmentally friendly sole according to claim 1, characterized in that: In step S4, the steam pressure of the secondary sintering needs to be increased by 0.3-0.7 MPa based on the original steam pressure conditions of ETPU, and the steam molding time is increased by about 20-40S.

5. The method for making an ETPU environmentally friendly sole according to claim 3, characterized in that: In step S3, the crushed particles and the new material are mixed by a mixing device (2), wherein the mixing device (2) comprises a tank body (21), a mixing barrel (23) built in the tank body (21), a storage bin (22) arranged at the top of the tank body (21), a feed pipe (25) connected to the storage bin (22), a stirring shaft (26) built in the mixing barrel (23), and a driving assembly (24) arranged in the tank body (21) to drive the mixing barrel (23) to rotate; the storage bin (22) and the feed pipe (25) are connected to the storage bin (22), and the stirring shaft (26) is connected to the mixing barrel (23). A plurality of material pipes (25) are provided. The storage bin (22) is used to store crushed grains or new materials. The feed pipe (25) extends into a mixing barrel (23). The mixing barrel (23) is connected to a discharge pipe (231). The discharge pipe (231) is rotatably penetrated through the bottom wall of the tank body (21). Control valves (4) are provided on the feed pipe (25) and the discharge pipe (231). An adjustment component (5) for changing the height position of the discharge end of the feed pipe (25) is provided in the mixing barrel (23).

6. The method for making an ETPU environmentally friendly sole according to claim 5, characterized in that: The adjusting assembly (5) comprises a screw (51) arranged in the middle of the mixing barrel (23) to rotate together with the mixing barrel (23) and a connecting ring (52) threadedly connected to the screw (51), the axis of the screw (51) is coaxially arranged with the axis of the mixing barrel (23), the feeding pipe (25) comprises a first pipe (6) connected to the storage bin (22) and a second pipe (7) connected to the first pipe (6) and capable of being telescopic, and the connecting ring (52) is connected to a plurality of second pipes (7).

7. The method for making an ETPU environmentally friendly sole according to claim 6, characterized in that: The second tube (7) is a telescopic tube, comprising a plurality of mutually connected folding rings (71), wherein two adjacent folding rings (71) are arranged alternately with each other, and the two adjacent folding rings (71) can be bent along the connection, and the folding ring (71) close to the bottom wall of the mixing barrel (23) is connected to the connecting ring (52).

8. The method for making an ETPU environmentally friendly sole according to claim 7, characterized in that: The feed pipe (25) further comprises an inner liner pipe (8) arranged in the telescopic pipe and a storage ring (9) arranged outside the first pipe (6); the inner liner pipe (8) is elastic, and comprises a plurality of connecting sleeves (81) and an elastic airbag (82) arranged between adjacent connecting sleeves (81); the elastic airbag (82) has a cavity (821) for accommodating a medium; the connecting sleeve (81) has a channel (811) connected to the cavity (821). ), the elastic airbag (82) comprises a first elastic band (822) arranged close to the telescopic tube and a second elastic band (823) connected to the first elastic band (822) and arranged away from the telescopic tube, the hardness of the first elastic band (822) is smaller than the hardness of the second elastic band (823), the storage ring (9) is used to store the medium, and the storage ring (9) is connected to the channel (811) arranged on the connecting sleeve (81); when the telescopic tube is unfolded, the lining tube (8) is pulled into a taut state.

9. The method for making an ETPU environmentally friendly sole according to claim 8, characterized in that: The first elastic band (822) is arranged between the spaces formed by the two folding rings (71), and the first elastic band (822) is connected to the two folding rings (71).

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