A device and method for instant recycling and regranulation of offcuts in the production of injection-moulded shoes

Abstract

This application relates to an apparatus and method for immediate recycling and granulation of scrap materials during injection molding shoe production, belonging to the technical field of plastic recycling devices. The apparatus includes a conveying and sorting device, a preliminary drying unit, a drying device, and a granulation device. The conveying and sorting device includes a water tank for processing non-metallic waste and debris, a conveyor belt, elastic baffles, and a water replenishment tank. A water pump is installed inside the water replenishment tank. The outlet of the water pump is connected to the inside of the water tank for processing non-metallic waste and debris. The water tank for processing non-metallic waste and debris has an inlet and an outlet. A movable channel is located at the bottom of the water tank. A water-dispersing plate is installed on the conveyor belt. The bottom end of the elastic baffle is connected to the water tank for processing non-metallic waste and debris. The top end of the elastic baffle is connected to the preliminary drying unit, which is located at the outlet. This application has the technical effect of improving the sorting efficiency and accuracy of scrap materials.

Description

Technical Field

[0001] This application relates to the technical field of plastic recycling devices, and in particular to a device and method for immediate recycling and granulation of scrap materials from the injection molding shoe production process. Background Technology

[0002] The injection molding process for shoes continuously generates a large amount of mixed PVC and TPR scraps. PVC and TPR differ significantly in melting temperature, melt flowability, hardness, and compatibility. If they are not separated and directly blended and granulated, the recycled particles will have uneven composition. This can easily lead to defects such as fluctuations in mechanical properties, delamination, surface defects, and difficulty in maintaining stable molding processes during subsequent injection molding. Furthermore, mixing and recycling these two materials significantly reduces the quality of the recycled material, limiting the applicability of the recycled particles. Therefore, it is necessary to collect PVC and TPR scraps separately during the scrap recycling stage, granulate them separately, and ensure that the properties of the recycled particles are stable enough to be reused in injection molding shoe production, thereby increasing the utilization value of the recycled materials.

[0003] Current recycling methods mostly involve collecting and transporting mixed scraps to off-site centralized processing, and then manually separating the mixed PVC and TPR scraps. Because PVC and TPR scraps are very similar in appearance, manual differentiation is difficult, and manual sorting is prone to mixing, omissions, and missorting, resulting in extremely low separation accuracy. Furthermore, manual sorting is inefficient, labor-intensive, requires a large workforce, is time-consuming, and limits production capacity, failing to meet the continuous scrap recycling needs of injection-molded shoe production lines.

[0004] Patent application number 202010755755.8 discloses a PE material recycling and processing device, comprising a feeding device, a washing and sizing device, a drying and feeding device, and a granulation device. The feeding device is a conveyor belt mechanism. The water inlet pipe of the washing and sizing device is equipped with a washing liquid container, and the valves of the water inlet pipe and the washing liquid container can be automatically adjusted according to the liquid level inside the washing and sizing device. The drying and feeding device uses an air source to intermittently dry and feed the PE material. The discharge end of the granulation device is equipped with a discharge pipe with a variable diameter and a die head, which work together to achieve uniform granulation of the PE material. Although the above patent can clean plastics, it cannot separate plastics of different materials, and manual sorting of different materials before feeding them into the feeding device is required, which is time-consuming and labor-intensive.

[0005] Regarding the aforementioned technologies, the inventors believe that they suffer from the drawbacks of time-consuming and labor-intensive granulation and separation of scrap materials. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a device and method for the immediate recycling and granulation of scrap materials during the injection molding shoe production process.

[0007] This application provides a device for the immediate recycling and granulation of scrap materials from the injection-molded shoe production process, which adopts the following technical solution: A device for the immediate recycling and granulation of scrap materials from injection-molded shoe production includes a conveying and sorting device, a preliminary drying unit, a drying device, and a granulation device. The conveying and sorting device includes a water tank for processing non-metallic waste and debris, a conveyor belt, an elastic baffle, and a water replenishment tank. A water pump is installed inside the water replenishment tank. The outlet of the water pump is connected to the inside of the water tank. The water tank has an inlet and an outlet. A movable channel is located at the bottom of the water tank. The conveyor belt is vertically arranged within the movable channel. A water-dispelling plate is installed on the conveyor belt. The bottom end of the elastic baffle is connected to the water tank. The top end of the elastic baffle is connected to the preliminary drying unit, which is located at the outlet.

[0008] By adopting the above technical solution, based on the density difference of PVC and TPR scraps, stratified separation is achieved in the water tank for processing non-metallic waste and debris. The conveyor belt, vertically arranged in the moving channel and equipped with water-dispersing plates, can agitate the water to form a pulsating water flow, guiding the floating scraps in batches through elastic baffles to the preliminary drying unit, preventing material accumulation and blockage, and ensuring continuous and stable sorting and conveying. The preliminary drying unit can sort and preliminarily dehydrate the scraps on-site at the injection molded shoe production site, reducing the processing load of the downstream drying equipment and reducing energy consumption. The subsequent drying equipment and granulation process realize closed-loop recycling and regranulation of scraps, improving the scrap recycling efficiency.

[0009] Preferably, the conveyor belt is provided with a net; the net is located above the water-dispensing plate.

[0010] By adopting the above technical solution, the net above the water deflector can effectively catch PVC scraps and mixed TPR scraps wrapped in PVC that fall into the active channel. Combined with the vertical reciprocating motion of the conveyor belt, the materials are turned over, washed and broken up, so that the wrapped mixed scraps are fully separated and the mixed TPR scraps float smoothly to the water surface to participate in the sorting. This greatly improves the sorting purity of PVC and TPR scraps, reduces material mixing and waste, and at the same time, the net can prevent fine materials from falling directly, avoid the loss of small scraps, and further improve the overall recycling rate of scraps.

[0011] Preferably, the elastic baffle is provided with an assist baffle; after the net moves up, it abuts against the bottom wall of the assist baffle.

[0012] By adopting the above technical solution, the net can push against the assist baffle when it moves upward with the conveyor belt, thereby driving the elastic baffle to swing. After the net moves downward, the elastic baffle returns to its original position. Relying on the continuous vertical reciprocating motion of the conveyor belt, the elastic baffle forms a periodic swing, which can achieve self-excited disturbance of the baffle without the need for an additional independent drive mechanism. The swing of the baffle, combined with the pulsation of the water body, enhances the flushing of the scrap material, effectively removing the mud and sand impurities attached to the surface of the scrap material. At the same time, the periodic swing of the baffle assists in the batch transportation of materials, prevents material accumulation, and ensures continuous and stable sorting and transportation.

[0013] Preferably, the elastic baffle is inclined to the outside of the water tank for processing non-metallic waste and debris.

[0014] By adopting the above technical solution, the elastic baffle is arranged inclined to the outside of the water tank for processing non-metallic waste and scrap. The intermittent water flow that climbs along the inclined surface of the baffle can smoothly transport the scrap material upward with the guidance of the inclined surface, so as to realize the stable transfer of materials to the preliminary drying unit.

[0015] Preferably, the elastic baffle is provided with a plurality of protrusions; the plurality of protrusions are evenly arranged along the length direction of the elastic baffle; the bottom of the protrusions has an arc-shaped guide surface.

[0016] By adopting the above technical solution, multiple protrusions are evenly arranged along the length of the elastic baffle. The protrusions can catch the scraps that rise with the water flow, and can block and spread the scraps, ensuring that the scraps are in full contact with the water flow and improving the cleaning effect. The bottom of the protrusions is provided with an arc-shaped guide surface, which can smoothly guide the water flow that rises along the elastic baffle, reduce the water flow resistance, reduce the water flow turbulence loss, and improve the water flow's ability to transport scraps upward. The arc-shaped guide surface forms a guiding effect on the water flow, driving the water flow to adhere to the surface of the protrusions and strengthening the contact and scouring effect between the water flow and the scraps.

[0017] Preferably, the preliminary drying unit includes a water storage tank disposed at the water outlet and a filter screen located inside the water storage tank; one end of the filter screen is connected to the elastic baffle, and the other end is connected to a squeezing unit.

[0018] By adopting the above technical solution, the water filter can receive PVC scraps conveyed by the elastic baffle. The water carried by the scraps can pass through the water filter and flow into the water storage tank, which can perform preliminary drying of the PVC scraps and reduce the drying burden on the drying equipment.

[0019] Preferably, the dewatering unit includes multiple dewatering modules; each dewatering module includes a slide rod, a connecting plate, and a dewatering plate; the slide rod is slidably disposed within the water storage tank; one end of the connecting plate is hinged to the slide rod, and the other end is hinged to one end of the dewatering plate; the other end of the dewatering plate is hinged to the slide rod of the adjacent dewatering module; the slide rod at the first end is connected to the filter screen; one end of the dewatering plate at the last end is hinged to the water storage tank; the water storage tank has a discharge port.

[0020] By adopting the above technical solution, the displacement caused by the swing of the elastic baffle drives the sliding rod to slide, which in turn causes the dewatering unit to retract and expand. When the dewatering unit retracts, a squeezing space is formed between the adjacent connecting plates and the squeezing plates, which mechanically squeezes and dewaters the PVC scraps. When the dewatering unit expands, it releases the squeezing and automatically unloads the material by its own weight. The dewatering unit does not require additional drive components, has a simple and compact structure, and multiple squeezing modules work together to squeeze the scraps in batches, improving the uniformity of dewatering. The water generated by squeezing can fall into the water storage tank for centralized collection, realizing continuous pre-dewatering operation.

[0021] Preferably, the water storage tank has two downwardly inclined grooves; the two ends of the plurality of sliding rods are respectively slidably disposed in the two grooves.

[0022] By adopting the above technical solution, the inclined chute keeps the entire dewatering unit in a downward inclined state. On the one hand, it reduces the sliding resistance of the slide bar, making it easier for the elastic baffle to swing and drive the slide bar to move smoothly. On the other hand, the inclined layout allows the scrap material after extrusion to roll down smoothly by its own weight, achieving automatic unloading, avoiding material from accumulating on the dewatering unit, and ensuring continuous conveying of scrap material.

[0023] Preferably, the extrusion plate and the connecting plate each have a plurality of water filter holes.

[0024] By adopting the above technical solution, during the extrusion of PVC scraps, the water squeezed out from the material can quickly drip down through the filter holes and flow into the water storage tank, thus timely draining the water generated by extrusion, preventing the accumulated water from soaking the scraps again, and ensuring the mechanical water squeezing effect.

[0025] This application also provides a method for immediate recycling and regranulation of scrap materials during the injection molding shoe production process, which adopts the following technical solution: A method for immediate recycling and granulation of scrap materials from injection-molded shoe production includes the following steps: Step S1: Start the conveyor belt and feed the mixed scraps containing PVC scraps and TPR scraps into the feed inlet of the non-metallic waste and debris processing water tank; the TPR scraps float on the water surface and the PVC scraps sink to the bottom of the non-metallic waste and debris processing water tank. In step S2, the conveyor belt drives the water-repelling plates arranged at intervals on it to move synchronously, forming waves on the water surface and conveying the TPR scraps to the preliminary drying unit in batches. Step S3: The preliminary drying unit discharges the TPR scraps through the outlet. Step S4: Deep vacuum drying of TPR scraps using a vacuum drying device; Step S5: The fully dried PVC scraps are fed into a granulation device for melt granulation.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. Based on the density difference between PVC and TPR scraps, non-metallic waste and scraps are separated into layers within a water tank. A vertically arranged conveyor belt equipped with water-dispersing plates in the moving channel agitates the water to create a pulsating flow, guiding the floating scraps in batches through elastic baffles to the preliminary drying unit. This prevents material accumulation and blockage, ensuring continuous and stable sorting and conveying. The preliminary drying unit allows for immediate sorting and initial dehydration of scraps at the injection molding shoe production site, reducing the processing load on the downstream drying equipment and minimizing energy consumption. Subsequent drying and granulation processes achieve closed-loop recycling and regranulation of scraps, improving scrap recycling efficiency.

[0027] 2. The displacement caused by the swing of the elastic baffle drives the sliding rod to slide, causing the dewatering unit to retract and expand. When the dewatering unit retracts, a squeezing space is formed between the adjacent connecting plates and the squeezing plates, which mechanically squeezes and dewaters the PVC scraps. When the dewatering unit expands, it releases the squeezing and automatically unloads the material by its own weight. The dewatering unit does not require additional drive components, has a simple and compact structure, and multiple squeezing modules work together to squeeze the scraps in batches, improving the uniformity of dewatering. The water generated by squeezing can fall into the water storage tank for centralized collection, realizing continuous pre-dewatering operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the external structure of the conveying and sorting device.

[0029] Figure 2 This is a schematic diagram of the internal structure of the conveying and sorting device.

[0030] Figure 3 This is a schematic diagram of the conveyor belt structure in the embodiment.

[0031] Figure 4 This is a schematic diagram of the elastic baffle in the embodiment.

[0032] Figure 5 yes Figure 4 A magnified view of part B in the image.

[0033] Figure 6 yes Figure 4 A magnified view of part C.

[0034] Figure 7 This is a schematic diagram of the folded state of the dewatering unit in the embodiment.

[0035] Explanation of reference numerals in the attached figures: 1. Conveying and sorting device; 11. Water tank for processing non-metallic waste and scrap; 111. Feed inlet; 112. Discharge outlet; 113. Moving channel; 12. Conveyor belt; 121. Water deflector; 122. Netting; 13. Elastic baffle; 131. Assist baffle; 132. Raised bar; 2. Preliminary drying unit; 21. Water storage tank; 22. Filter screen; 3. Extrusion module; 31. Slide bar; 32. Connecting plate; 33. Extrusion plate; 4. Water replenishment tank. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0037] This application discloses an apparatus for the immediate recycling and granulation of scrap materials during the injection molding process of shoes. (Refer to...) Figure 1-3 The system includes a conveying and sorting device 1, a preliminary drying unit 2, a drying device, and a granulation device. The conveying and sorting device 1 includes a water tank 11 for processing non-metallic waste and debris, a conveyor belt 12, an elastic baffle 13, and a water replenishment tank 4. A water pump is installed inside the water replenishment tank 4. The outlet of the water pump is connected to the inside of the water tank 11 for processing non-metallic waste and debris. The water tank 11 for processing non-metallic waste and debris has an inlet 111 and an outlet 112. The bottom of the water tank 11 for processing non-metallic waste and debris has a movable channel 113. The conveyor belt 12 is vertically arranged inside the movable channel 113. A water deflector 121 is installed on the conveyor belt 12.

[0038] The elastic baffle 13 is inclined towards the preliminary drying unit 2; the bottom end of the elastic baffle 13 is connected to the water tank 11 for processing non-metallic waste and debris; the top end of the elastic baffle 13 is connected to the preliminary drying unit 2; the water level in the water tank 11 for processing non-metallic waste and debris is higher than the water deflector 121 and lower than the top end of the elastic baffle 13.

[0039] The non-metallic waste and scrap processing water tank 11 has an inclined section; a mixture of PVC scrap and TPR scrap enters the inclined section from the inlet 111 of the non-metallic waste and scrap processing water tank 11; the TPR scrap floats on the water surface, while the PVC scrap falls down to the inclined section and slides along the inclined section towards the movable channel 113; then the conveyor belt 12 is started, and the drive motor of the conveyor belt 12 drives the conveyor belt 12 to run in both forward and reverse directions alternately, so that the conveyor belt 12 drives the water-dispensing plate 121 along the movable channel 113. 13 moves vertically back and forth; when the water deflector 121 moves upward, it can push the water flow upward; when the water deflector 121 moves downward, the overall water level drops; after the water deflector 121 moves downward back and forth, it forms waves on the water surface; the waves push the TPR scraps floating on the water surface in batches to flow upward along the elastic baffle 13, and finally pass over the top of the elastic baffle 13 and enter the preliminary drying unit 2; thus achieving the effect of flushing the TPR scraps on the water surface into the preliminary drying unit 2 in batches; so that the preliminary drying unit 2 dries the TPR scraps in batches, thereby improving the drying effect of the TPR scraps. The water pump can continuously pump water from the water supply tank 4 into the non-metallic waste and scrap processing water tank 11 to replenish the water flowing out of the non-metallic waste and scrap processing water tank 11.

[0040] A net 122 is provided on the conveyor belt 12; the net 122 is located above the water-repelling plate 121; the net 122 can catch PVC scraps flowing into the active channel 113 as well as some TPR scraps wrapped by PVC scraps; the conveyor belt can also drive the net 122 to move vertically in the active channel 113, and wash away and disperse the PVC scraps and some TPR scraps in the net 122, so that the TPR scraps are separated from the PVC scraps and float to the water surface.

[0041] The elastic baffle 13 is made of 4mm thick 65Mn spring steel plate. The bottom end of the elastic baffle 13 is fixed to the side wall of the water tank 11 for processing non-metallic waste and scrap, and the top end is free. An auxiliary baffle 131 is set on the elastic baffle 13. After the net 122 moves up, it can abut against the bottom wall of the auxiliary baffle 131 and push the auxiliary baffle 131 and the elastic baffle 13 to swing towards the primary drying unit 2. After the net 122 moves down, the elastic baffle 13 returns to its original position. After the net 122 moves vertically back and forth and continuously pushes the auxiliary baffle 131, the elastic baffle will continuously swing. On the one hand, the elastic baffle can receive the PVC scraps transported by the water flow climbing up the slope. With the help of intermittent water flow, the material is transported in batches, which facilitates the batch processing of materials in the primary drying unit and improves the drying effect. At the same time, the pulsating water flow, together with the swing of the baffle, disturbs the water body and forms a scouring effect on the scraps, effectively removing the mud and sand impurities attached to the surface of the scraps.

[0042] It should be noted that the frequency of vertical movement of the baffle plate 121 is relatively low; the baffle plate 121 moves vertically 3 to 4 times per minute; the total duration of a single reciprocating stroke is 15 to 20 seconds; the upward movement time of the baffle plate 121 is 8 to 12 seconds, and the downward movement time of the baffle plate 121 is 7 to 10 seconds; this makes the water body disturbance gentle and does not produce violent turbulence; the waves gently and continuously push the TPR up along the elastic baffle plate 13.

[0043] Multiple raised strips 132 are evenly arranged along the length of the elastic baffle 13. The bottom of the raised strips 132 has an arc-shaped guide surface, and the height of the raised strips 132 is higher than the water surface. TPR scraps washed up by the water flow fall on the top of the raised strips 132. There are gaps between the raised strips 132, and water can flow down through the gaps. The arc-shaped surface at the bottom of the raised strips 132 facilitates the upward flow of water and TPR scraps that climb up the elastic baffle 13. The water flow at the elastic baffle 13 can wash away the PVC scraps on the raised strips 132, thus cleaning the PVC scraps.

[0044] The preliminary drying unit 2 includes a water storage tank 21 located at the water outlet and a filter screen 22 located inside the water storage tank 21 and inclined downwards. One end of the filter screen 22 is connected to an elastic baffle 13, and the other end is connected to a squeezing unit. PVC scraps conveyed from the elastic baffle 13 fall onto the filter screen 22. Water from the PVC scraps falls from the mesh of the filter screen 22 into the water storage tank 21 below. The PVC scraps slide down the inclined filter screen 22 by their own weight and enter the squeezing unit.

[0045] Specifically, the dewatering unit includes multiple extrusion modules 3; each extrusion module 3 includes a slide rod 31, a connecting plate 32, and an extrusion plate 33; the slide rod 31 is slidably disposed within the water storage tank 21; specifically, the water storage tank 21 has two downwardly inclined grooves; the two ends of the multiple slide rods 31 are respectively slidably disposed within the two grooves; this causes the entire dewatering unit to tilt downwards, facilitating the downward movement of PVC scraps; one end of the connecting plate 32 is hinged to the slide rod 31, and the other end is hinged to one end of the extrusion plate 33; the other end of the extrusion plate 33 is hinged to the slide rod 31 of its adjacent extrusion module 3; the slide rod 31 at the first end is connected to the filter screen 22; the end of the extrusion plate 33 is hinged to the body of the water storage tank 21, forming a fixed support point for the entire dewatering unit. The entire dewatering unit constitutes a multi-link foldable telescopic mechanism; the water storage tank 21 has a discharge port 112; and the extrusion plate 33 at the end is located at the discharge port 112; the PVC scraps on the dewatering unit can be discharged from the discharge port 112, and a collection box is provided at the discharge port 112 to collect the pre-dried PVC scraps that fall from the discharge port 112; the drying device is a vacuum dryer, and then the pre-dried PVC scraps in the drying box are transferred to the drying device for further drying.

[0046] It should be noted that the end of the water squeezing unit closest to the filter screen 22 is defined as the beginning of the water squeezing unit, and the other end is defined as the end of the water squeezing unit.

[0047] The elastic baffle 13 maintains its initial equilibrium position by the elastic force of the 65Mn spring steel plate, without any outward displacement. The filter screen 22 is not subjected to any thrust, and the first end slide rod 31 remains in the initial position at the top of the chute. The multiple connecting plates 32 and multiple extrusion plates 33 are in a flat state, and the surfaces of the multiple extrusion plates 33 and connecting plates 32 are open to each other, making it easy for the PVC scraps on the filter screen 22 to roll off onto the extrusion unit.

[0048] When the elastic baffle 13 deflects outward from the water tank 11 for processing non-metallic waste and scrap, it pushes the filter screen 22, which in turn pushes the slide bar 31 at the first end to slide downward along the chute. Since the end extrusion plate 33 is hinged to the water storage tank 21, the connecting plate 32 and the extrusion plate 33, which are connected in series, rotate relative to each other. The originally flat connecting plate 32 and the extrusion plate 33 rotate and retract towards each other, and adjacent extrusion plates 33 and connecting plates 32 move closer to each other, forming an extrusion space. The PVC scraps that roll off and remain on the squeezing unit are wrapped in the extrusion space. As the slide bar 31 continues to slide, the degree of folding of the squeezing unit increases, the volume of the extrusion space decreases, and the connecting plate 32 and the extrusion plate 33 apply mechanical extrusion force to the PVC scraps in the extrusion space.

[0049] Several filter holes are made on the surfaces of the extrusion plate 33 and the connecting plate 32; the water trapped inside the PVC scrap is forcibly squeezed out; the squeezed water drips down through the filter holes and is collected in the water storage tank 21. Compared with simple gravity drainage through the filter screen 22, mechanical extrusion can remove the retained water in the gaps of the material that is difficult to drain by its own weight, significantly reducing the initial moisture content entering the vacuum dryer, reducing vacuum drying energy consumption, and shortening the drying time. When the elastic baffle 13 is reset, the squeezing unit is back to a flat state, and the PVC scrap rolls down along the flat squeezing unit to the discharge port 112 of the water storage tank 21; it enters the collection box; then the PVC scrap is placed in the drying device, dried by the drying device and discharged, and the dried PVC scrap is put into the granulation device for granulation.

[0050] The working principle of the device for immediate recycling and granulation of scrap materials in the injection-molded shoe production process described in this application is as follows: Mixed PVC and TPR scraps are fed into the inclined section of the non-metallic waste and debris processing water tank 11. The less dense TPR scraps float on the surface, while the PVC scraps sink down the slope to the bottom channel of the non-metallic waste and debris processing water tank 11. The conveyor belt 12 drives the water-dispelling plate 121 to move vertically in both forward and reverse directions, stirring the water and creating waves. The TPR scraps are pushed to the surface in batches and then pushed up along the elastic baffle 13 into the preliminary drying unit 2. The net 122 on the conveyor belt 12 moves up and down synchronously, catching the sinking PVC scraps and the TPR scraps they are carrying. The materials are washed by the water flow within the net 122, causing the stuck TPR scraps to peel off and float to the surface.

[0051] The self-excited disturbance of the elastic baffle 13 and the upward movement of the material screening basket 122 push the auxiliary baffle 131, driving the 65Mn elastic baffle 13 to swing outward. After the basket 122 moves down, the auxiliary baffle 131 relies on the elasticity of the elastic baffle 13 to return to its original position, continuously reciprocating to form a self-excited swing. In conjunction with the pulsating water flow, the TPR scraps are continuously flushed to remove surface mud and sand. The protrusions 132 on the auxiliary baffle 131 achieve water-material separation. The water flows back to the non-metallic waste and debris processing water tank 11, and the TPR scraps are continuously conveyed to the preliminary drying unit 2, while some PVC scraps are blocked from flowing back to the non-metallic waste and debris processing water tank 11.

[0052] PVC scrap first falls onto the inclined filter screen 22 for initial gravity filtration, then slides down to the dewatering unit. When the elastic baffle 13 swings outward, it pushes the filter screen 22, causing the first end slide rod 31 to slide along the inclined chute, driving the series-connected hinged connecting plate 32 and extrusion plate 33 to fold and retract, forming an extrusion space to extrude the PVC scrap. The water retained in the PVC scrap flows into the water storage tank 21 through the filter holes of the connecting plate 32 and extrusion plate 33. After the elastic baffle 13 springs back to its original position, the dewatering unit expands and flattens again, releasing the extrusion. The dehydrated PVC scrap slides down by its own weight and falls from the discharge port 112 into the vacuum dryer for deep drying. After drying, it is sent to the granulation device to be processed into recycled particles.

[0053] By utilizing the density difference between PVC and TPR scrap materials, and relying on the periodic intermittent water flow formed by the conveyor belt 12 and the water deflector 121, the materials are sorted. The self-excited oscillation of the elastic baffle 13 is used as the power to link the multi-link squeezing mechanism to complete the graded dewatering. Finally, the scrap materials are recycled and granulated through vacuum drying.

[0054] This application also discloses a method for immediate recycling and granulation of scrap materials during injection molding shoe production, including the following steps: Step S1: Start the conveyor belt 12 and feed the mixed scrap containing PVC scrap and TPR scrap into the feed inlet 111 of the non-metallic waste and debris processing water tank 11. Utilizing the different densities of the two scraps, the TPR scrap floats on the water surface, while the PVC scrap sinks into the net of the conveyor belt 12, thus achieving the separation of the two materials into layers.

[0055] In step S2, the conveyor belt 12 drives the spaced water-dispensing plates 121 on it to move synchronously. The water-dispensing plates 121 periodically push the water, forming waves on the water surface. The waves periodically transport the TPR scraps in batches to the preliminary drying unit 2 and wash and remove impurities from the surface of the scraps. The conveyed PVC scraps first fall onto the inclined filter screen 22 to complete gravity filtration and remove surface free water. When the elastic baffle 13 swings, it drives the filter screen 22 and the squeezing unit to move, causing the multiple sets of hinged squeezing modules 3 of the squeezing unit to fold and retract, mechanically squeezing and dewatering the PVC scraps. The squeezed water flows into the water storage tank 21 through the filter holes of the squeezing unit.

[0056] In step S3, after the elastic baffle 13 resets, the squeezing unit expands again, and the PVC scraps after squeezing and dewatering slide along the squeezing unit and are discharged from the outlet 112 of the water storage tank 21. Step S4: Deep vacuum drying of TPR scraps using a vacuum drying device to remove residual internal moisture.

[0057] Step S5: The fully dried PVC scraps are fed into a granulation device for melt granulation, completing the immediate recycling and granulation of the injection molded shoe scraps.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for immediate recycling and granulation of scrap materials from injection-molded shoe production, characterized in that: The system includes a conveying and sorting device (1), a preliminary drying unit (2), a drying device, and a granulation device. The conveying and sorting device (1) includes a water tank (11) for processing non-metallic waste and debris, a conveyor belt (12), an elastic baffle (13), and a water replenishment tank (4). A water pump is installed inside the water replenishment tank (4). The outlet of the water pump is connected to the water tank (11) for processing non-metallic waste and debris. The water tank (11) for processing non-metallic waste and debris has an inlet (111) and an outlet (112). The bottom of the water tank (11) for processing non-metallic waste and scrap has an active channel (113); the conveyor belt (12) is vertically arranged in the active channel (113); a water-dispelling plate (121) is provided on the conveyor belt (12); the bottom end of the elastic baffle (13) is connected to the water tank (11) for processing non-metallic waste and scrap; the top end of the elastic baffle (13) is connected to the preliminary drying unit (2); the preliminary drying unit (2) is located at the discharge port (112).

2. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 1, characterized in that: A net (122) is provided on the conveyor belt (12); the net (122) is located above the water-dispensing plate (121).

3. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 2, characterized in that: An assisting baffle (131) is provided on the elastic baffle (13); after the net (122) moves upward, it abuts against the bottom wall of the assisting baffle (131).

4. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 1, characterized in that: The elastic baffle (13) is inclined toward the preliminary drying unit (2).

5. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 4, characterized in that: The elastic baffle (13) is provided with a plurality of protrusions (132); the plurality of protrusions (132) are evenly arranged along the length direction of the elastic baffle (13); the bottom of the protrusions (132) has an arc-shaped guide surface.

6. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 1, characterized in that: The preliminary drying unit (2) includes a water storage tank (21) located at the water outlet and a filter screen (22) located in the water storage tank (21); one end of the filter screen (22) is connected to the elastic baffle (13), and the other end is connected to a squeezing unit.

7. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 6, characterized in that: The squeezing unit includes multiple squeezing modules (3); each squeezing module (3) includes a slide rod (31), a connecting plate (32), and a squeezing plate (33); the slide rod (31) is slidably disposed in the water storage tank (21); one end of the connecting plate (32) is hinged to the slide rod (31), and the other end is hinged to one end of the squeezing plate (33); the other end of the squeezing plate (33) is hinged to the slide rod (31) of the adjacent squeezing module (3); the slide rod (31) at the first end is connected to the filter screen (22); one end of the squeezing plate (33) at the end is hinged to the water storage tank (21); the water storage tank (21) has a discharge port (112).

8. The device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 7, characterized in that: The water storage tank (21) has two downward-sloping grooves; the two ends of the plurality of sliding rods (31) are respectively slidably disposed in the two grooves.

9. A device for immediate recycling and granulation of scrap materials in the injection molding shoe production process according to claim 8, characterized in that: The extrusion plate (33) and the connecting plate (32) each have a number of water filter holes.

10. A method for immediate recycling and granulation of scrap materials during injection molding shoe production, using the immediate recycling and granulation device for scrap materials during injection molding shoe production as described in any one of claims 1 to 9, characterized in that... Includes the following steps: Step S1: Start the conveyor belt and feed the mixed scraps containing PVC scraps and TPR scraps into the feed inlet of the non-metallic waste and debris processing water tank; the TPR scraps float on the water surface and the PVC scraps sink to the bottom of the non-metallic waste and debris processing water tank. In step S2, the conveyor belt drives the water-repelling plates arranged at intervals on it to move synchronously, forming waves on the water surface and conveying the TPR scraps to the preliminary drying unit in batches. Step S3: The preliminary drying unit discharges the TPR scraps through the outlet. Step S4: Deep vacuum drying of TPR scraps using a vacuum drying device; Step S5: The fully dried PVC scraps are fed into a granulation device for melt granulation.

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