Foamed plastic scrap recycling and crushing device

Abstract

The application belongs to the technical field of foam plastic recycling, and particularly relates to a foam plastic leftover material recycling and crushing device, which comprises an equipment frame, a feeding machine, a crushing frame, a soft plastic classification part, a liquid nitrogen supply assembly, a light crushing classification part, a first rapid cooling cabin, a second rapid cooling cabin and a cold air recovery pipeline; the soft, hard and foam plastics are accurately sorted by a classification roller; the soft plastic is fully brittle after being cooled by the double rapid cooling cabins in cooperation with the liquid nitrogen, and then is sent into the crushing frame for crushing; the cold air recovery pipeline is used for recycling the cold energy generated in the freezing process; the mesh cage is used for collecting the foam debris and other light and small particles generated in the crushing process; the integrated and efficient recycling of different types of plastics is realized; the problems of easy blocking in the mixed crushing of the existing device, waste of cold energy and the like are solved; the device meets the environmental protection and recycling requirements, can reduce the operation cost of the device, and improves the recycling and crushing efficiency and the product quality.

Description

Technical Field

[0001] This invention belongs to the field of foam plastic recycling technology, specifically a foam plastic scrap recycling and crushing device. Background Technology

[0002] With the rapid development of the plastics industry, foamed plastics, rigid plastics, and flexible plastics are widely used in packaging, insulation, building materials, and other fields. As a result, the amount of various plastic scraps generated has increased. If plastic scraps are not effectively recycled, they will not only cause serious white pollution and damage the ecological environment, but also waste valuable plastic resources. Therefore, the recycling, crushing, and reuse of plastic scraps has become an important issue in the field of environmental protection and resource recycling.

[0003] The existing technology has the following drawbacks: Firstly, in the recycling and processing of foam plastics, rigid plastics, and soft plastic scraps, existing recycling and crushing devices usually lack a sorting mechanism, making it impossible to accurately sort plastic materials of different textures. This results in rigid plastics, soft plastics, and foam plastics being mixed together and entering the crushing mechanism. Soft plastics are soft and easily resilient, while rigid plastics are hard and brittle. When these are mixed and crushed, not only will soft plastics become entangled in the crushing parts and hard plastics be not completely crushed, but the differences in the characteristics of the plastic materials will also lead to low crushing efficiency, failing to meet the recycling needs of foam plastic scraps and increasing the difficulty and cost of subsequent recycling and processing.

[0004] Secondly, regarding the crushing of soft plastics, although some recycling crushing devices use low-temperature freezing to make them brittle, they usually use a single freezing chamber for one-time freezing, lacking a secondary freezing and hardening structure. This easily leads to insufficient freezing and hardening of soft plastics. When the insufficiently hardened soft plastics enter the crushing mechanism, they are very likely to adhere to the surface of the crushing rollers, causing the crushing rollers to become entangled and blocked, and the device to overload and shut down. This not only affects the continuity of crushing operations, but also aggravates the wear of crushing components, shortens the service life of the device, and leads to uneven particle size of the crushed products, affecting the subsequent recycling effect.

[0005] Third, existing cryogenic recovery and pulverizing devices suffer from wasted cooling capacity during the use of liquid nitrogen. The cryogenic air generated after the liquid nitrogen is frozen is generally discharged directly without being recycled, increasing the cost of liquid nitrogen consumption. At the same time, lightweight and fine particles such as foam debris generated during the pulverizing process tend to float inside the device, causing dust accumulation and pipe blockage. They may also be sucked into the suction mechanism, leading to damage to the suction mechanism and affecting the normal operation of the device. Furthermore, these lightweight and fine particles such as foam debris cannot be effectively collected, which can easily cause secondary pollution. Summary of the Invention

[0006] The purpose of this invention is to provide a foam plastic scrap recycling and crushing device. It accurately sorts plastic materials of different textures through a sorting mechanism, uses liquid nitrogen freezing to fully embrittle soft plastics, and uses a dual rapid cooling structure to ensure the embrittlement effect. Then, the crushing mechanism completes the crushing operation. At the same time, it recovers and utilizes the cold energy and collects lightweight fine particles such as foam debris, realizing integrated and efficient recycling of different types of plastics. It solves the problems of material blockage, cold energy waste, and pollution caused by existing recycling and crushing devices.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: A foam plastic scrap recycling and crushing device includes a frame and a feeder. The top of the frame has a feed inlet connected to the feeder. The inner cavity of the frame has a crushing frame and a soft plastic sorting section. A liquid nitrogen supply assembly is located on one side of the frame. A rigid plastic channel is connected to the top of the crushing frame. The soft plastic sorting section includes a guide block and a heat insulation plate on the side wall. Two sorting rollers are mounted on the guide block. A first rapid cooling chamber is located at the bottom of the two sorting rollers, and a second rapid cooling chamber is connected to the bottom of the first rapid cooling chamber. A cold air recovery pipe is located at the bottom of the frame, and a lightweight crushing and sorting section is located at the other end of the cold air recovery pipe. The lightweight crushing and sorting section is connected to the inner cavity of the frame via the cold air recovery pipe.

[0008] According to some embodiments of the present invention, the crushing frame is provided with two crushing rollers, one end of the two crushing rollers is connected to a crushing motor via a belt drive, the crushing motor is located on the side wall of the equipment frame, and the bottom end of the crushing frame is provided with a feeding hopper connected to a cold air recovery pipe.

[0009] According to some embodiments of the present invention, the liquid nitrogen supply assembly includes a high-pressure liquid nitrogen tank, one end of which is provided with a conduit, and an electrically controlled valve is provided on the conduit.

[0010] According to some embodiments of the present invention, the top of the flow guide block is provided with a plurality of arc-shaped plates arranged in an array; the heat insulation plate is arranged in an arc shape and the inner sidewall of the heat insulation plate is provided with a plurality of insert plates arranged in an array.

[0011] According to some embodiments of the present invention, one end of each of the two sorting rollers is rotatably connected to a guide block and is meshed with each other by gears. The other end of the sorting rollers is driven to a sorting motor, which is located on the outer side wall of the equipment frame. The outer side walls of the two sorting rollers are provided with a plurality of conical spikes and annular cutters.

[0012] According to some embodiments of the present invention, both sorting rollers are located in a first rapid cooling chamber. A discharge port is provided between the first and second rapid cooling chambers. A direct connection port is provided between the first rapid cooling chamber and the rigid plastic channel. A baffle plate is provided in the direct connection port. A separating roller is rotatably connected to the side wall of the baffle plate. One end of the separating roller is driven by a sorting motor via a belt. The bottom ends of both the second and first rapid cooling chambers are inclined. Both the second and first rapid cooling chambers are provided with liquid nitrogen spray hoods. The liquid nitrogen spray hoods are provided with multiple nozzles arranged in an array. The second rapid cooling chamber is connected to the rigid plastic channel.

[0013] According to some embodiments of the present invention, the lightweight crushing and sorting section includes a foam storage bin connected to a cold air recovery pipe. The inner cavity of the foam storage bin is provided with a mesh cage, the top of the mesh cage is provided with a filter plate, the top of the filter plate is provided with a suction pump, the output end of the suction pump is connected to a diversion pipe, and the other end of the diversion pipe is connected to a plurality of nozzles, which are respectively inserted into the inner cavities of a first rapid cooling chamber and a second rapid cooling chamber.

[0014] According to some embodiments of the present invention, one end of the feeder is inserted into the inner cavity of the feed inlet and extends to the top of the sorting roller; the bottom inner cavity of the discharge hopper and the inner cavity of the feed inlet are both provided with multiple wind baffles.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the combination of sorting rollers, conical spikes, and annular cutters, can accurately sort soft plastics and hard plastics. Soft plastics are introduced into a rapid cooling chamber for freeze-hardening, while hard plastics are fed into a crushing frame for crushing. This avoids the problems of soft plastics entangled in the crushing rollers and hard plastics not being crushed thoroughly, thus meeting the recycling needs of foam plastic scraps, improving crushing efficiency, reducing subsequent recycling costs, achieving accurate classification and efficient crushing of different types of plastics, and solving the defects of mixed crushing in existing devices. 2. This invention employs a dual-freezing structure—one-time freezing in the first rapid cooling chamber and secondary hardening in the second rapid cooling chamber—combined with a distribution roller to separate and transport hardened and unhardened plastic materials. This effectively avoids insufficient freezing of soft plastics, preventing them from adhering to the crushing rollers and causing blockages, overload shutdowns, and reduced wear on crushing components, thus extending the device's service life. Simultaneously, it ensures uniform particle size in the crushed product, improving subsequent recycling efficiency; and ensures sufficient freezing and hardening of soft plastics, guaranteeing the continuity and stability of the crushing operation. 3. This invention utilizes a combination of an air pump, a foam storage silo, a cold air recovery pipeline, and a diversion pipe to recover the low-temperature cold air generated during liquid nitrogen freezing and re-transport it to the rapid cooling chamber, thereby improving the utilization rate of liquid nitrogen and reducing its consumption cost. Simultaneously, a mesh cage and filter plate are used to collect lightweight, fine particles such as foam debris, preventing particles from floating and clogging pipelines and damaging the air extraction equipment, reducing secondary pollution, and achieving efficient collection of lightweight, fine particles such as foam debris through cold energy recycling. This results in energy conservation, environmental protection, and reduced operating costs.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic cross-sectional view of the device frame structure of the present invention; Figure 3 This is a schematic diagram of the flow guide block structure of the present invention; Figure 4 This is a schematic diagram of the sorting roller structure of the present invention; Figure 5 This is a cross-sectional view of the crushing frame of the present invention; Figure 6 This is a schematic diagram of the liquid nitrogen spray shroud structure of the present invention; Figure 7 This is a schematic diagram of the conical thorn and annular cutter structure of the present invention.

[0019] In the diagram: 1. Equipment frame; 2. Feeder; 3. Feed inlet; 4. Crushing frame; 41. Crushing roller; 42. Crushing motor; 43. Feed hopper; 5. Soft plastic sorting section; 51. Guide block; 511. Arc plate; 52. Insulation plate; 521. Insert plate; 53. Sorting roller; 531. Conical spike; 532. Circular cutter; 54. Sorting motor; 6. First rapid cooling chamber; 61. Feed outlet; 62. Straight through outlet; 6 3. Baffle plate; 64. Distributor roller; 7. Second rapid cooling chamber; 71. Liquid nitrogen spray hood; 711. Nozzle; 8. Rigid plastic channel; 9. Liquid nitrogen supply assembly; 91. High-pressure liquid nitrogen tank; 92. Conduit; 93. Electrically controlled valve; 10. Cold air recovery pipeline; 11. Lightweight crushing and sorting section; 111. Foam storage bin; 112. Wire cage; 113. Filter plate; 114. Air pump; 115. Diverter pipe; 116. Nozzle. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] like Figures 1-7 As shown, a foam plastic scrap recycling and crushing device includes a frame 1 and a feeder 2. The top of the frame 1 has a feed inlet 3 connected to the feeder 2. The inner cavity of the frame 1 has a crushing frame 4 and a soft plastic sorting section 5. A liquid nitrogen supply component 9 is located on one side of the frame 1. A rigid plastic channel 8 is connected to the top of the crushing frame 4. The soft plastic sorting section 5 includes a guide block 51 and a heat insulation plate 52 on the side wall. Two sorting rollers 53 are provided on the guide block 51. A first rapid cooling chamber 6 is located at the bottom of the two sorting rollers 53, and a second rapid cooling chamber 7 is connected to the bottom of the first rapid cooling chamber 6. A cold air recovery pipe 10 is located at the bottom of the frame 1, and a lightweight crushing and sorting section 11 is located at the other end of the cold air recovery pipe 10. The lightweight crushing and sorting section 11 is connected to the inner cavity of the frame 1 through the cold air recovery pipe 10. Various types of plastic scraps to be recycled can be added into the device through the feed inlet 3.

[0022] The crushing frame 4 is equipped with two crushing rollers 41. One end of each roller is connected to a crushing motor 42 via a belt drive. The crushing motor 42 is located on the side wall of the equipment frame 1. The bottom of the crushing frame 4 is equipped with a hopper 43 that connects to the cold air recovery pipe 10. The bottom of the hopper 43 is equipped with a hard crushing feed belt (not shown in the figure) for conveying the crushed hard plastic. During operation, the crushing motor 42 is started, and its output drives the two crushing rollers 41 to rotate in opposite directions, efficiently shearing and crushing the hard plastic and the soft plastic that has been frozen and brittled into the crushing frame 4. The crushed plastic material is discharged uniformly through the hopper 43. Compared with existing crushing structures that can only process a single type of plastic material, this device can adapt to plastic materials with different brittleness, with higher crushing uniformity and avoiding the problem of fragmentation and flying material.

[0023] The liquid nitrogen supply assembly 9 includes a high-pressure liquid nitrogen tank 91, with a conduit 92 at one end of the tank and an electrically controlled valve 93 on the conduit 92. During operation, the on / off state and flow rate of liquid nitrogen can be precisely controlled by the electrically controlled valve 93, allowing the cryogenic liquid nitrogen in the high-pressure tank 91 to be delivered to the corresponding rapid cooling chamber via the conduit 92 as needed. This provides a stable cold source for the freezing and embrittlement of soft plastics. Compared to existing open liquid nitrogen supply structures, the liquid nitrogen supply assembly 9 can achieve precise on-demand supply of liquid nitrogen, reducing ineffective evaporation and waste.

[0024] The top of the flow guide block 51 is provided with multiple arrayed arc-shaped plates 511; the heat insulation plate 52 is arc-shaped and has multiple arrayed insert plates 521 on its inner side wall. When the plastic material falls through the feed inlet 3, the arc-shaped plates 511 at the top of the flow guide block 51 can guide the falling plastic material, preventing it from splashing and scattering, and ensuring that the plastic material falls accurately into the sorting station; the arc-shaped heat insulation plate 52, together with the inner insert plates 521, can form a multi-layer heat insulation protection structure, reducing the outward loss of cold energy from the rapid cooling chamber, improving the utilization efficiency of cold energy, and solving the problems of serious cold energy leakage and high energy consumption in existing devices.

[0025] One end of each of the two sorting rollers 53 is rotatably connected to the guide block 51 and is set to mesh with each other through gears. The other end of the sorting rollers 53 is connected to a sorting motor 54, which is located on the outer wall of the equipment frame 1. Multiple conical spikes 531 and annular cutters 532 are provided on the outer walls of the two sorting rollers 53. During operation, the sorting motor 54 is started, and the output end of the sorting motor 54 drives the two sorting rollers 53 to rotate synchronously in opposite directions. During the falling process of the plastic material, soft plastics and foam plastics are pierced by the conical spikes 531 on the surface of the sorting rollers 53 and stably adhere to the surface of the sorting rollers 53. As the sorting rollers 53 rotate, they are smoothly rolled into the first rapid cooling chamber 6 below. During the rotation, the annular cutter 532 can pre-cut the soft plastics, reducing the load for the subsequent freezing and crushing processes. Hard plastics, on the other hand, cannot be adhered to by the conical spikes 531. During the falling process, they are directly thrown into the crushing frame 4 through the hard plastic channel 8 after being deflected by impact. This realizes the automatic and accurate pre-sorting of soft, hard, and foam plastics, eliminating the need for manual pre-sorting. It solves the defects of existing devices that cause soft plastics to entangle the blades and hard plastics to be incompletely crushed due to mixed crushing, thus improving work efficiency.

[0026] Both sorting rollers 53 are located in the first rapid cooling chamber 6. A material discharge port 61 is provided between the first rapid cooling chamber 6 and the second rapid cooling chamber 7. A direct connection port 62 is provided between the first rapid cooling chamber 6 and the rigid plastic channel 8. A baffle plate 63 is provided in the direct connection port 62. A sorting roller 64 is rotatably connected to the side wall of the baffle plate 63. One end of the sorting roller 64 is connected to the sorting motor 54 via a belt. The bottom ends of the second rapid cooling chamber 7 and the first rapid cooling chamber 6 are both inclined. Both the second rapid cooling chamber 7 and the first rapid cooling chamber 6 are provided with liquid nitrogen spray hoods 71. Multiple nozzles 711 are arranged in an array on the liquid nitrogen spray hoods 71. The second rapid cooling chamber 7 is connected to the rigid plastic channel 8. After the soft plastic is fed into the first rapid cooling chamber 6, the electrically controlled valve 93 opens, and liquid nitrogen is delivered to the liquid nitrogen spray hood 71 through the conduit 92. The liquid nitrogen is then evenly sprayed onto the surface of the soft plastic through the nozzle 711, achieving the initial freeze-hardening treatment. The output end of the sorting motor 54 synchronously drives the sorting roller 64 to rotate. The fully freeze-hardened plastic is brittle and hard, and will not be squeezed or deformed by the sorting roller 64. As the sorting roller 64 rotates, it is sent into the hard plastic channel 8 through the direct connection port 62 and finally falls into the crushing frame 4. The soft plastic that is not fully hardened is soft and can be squeezed and rolled into the bottom end of the sorting roller 64. It enters the second rapid cooling chamber 7 through the discharge port 61. Liquid nitrogen is sprayed through the nozzle 711 in the second rapid cooling chamber 7 for secondary freeze-hardening. After the soft plastic is completely brittle, it is sent into the crushing frame 4 through the hard plastic channel 8. The inclined bottom of the chamber ensures smooth conveying of plastic materials and prevents material accumulation. This dual freezing structure, combined with the automatic diversion design of the feed roller 64, avoids the problem of insufficient freezing of soft plastics compared to the existing single freezing chamber structure. It prevents un-brittle soft plastics from entering the crushing process and wrapping around the crushing roller 41, causing the device to block material, overload and shut down. At the same time, it slows down the wear rate of the crushing roller 41 and extends the service life of the device.

[0027] The lightweight crushing and sorting section 11 includes a foam storage bin 111 connected to the cold air recovery pipe 10. The inner cavity of the foam storage bin 111 is provided with a mesh cage 112. The top of the mesh cage 112 is provided with a filter plate 113. The top of the filter plate 113 is provided with a vacuum pump 114. The output end of the vacuum pump 114 is connected to a diversion pipe 115. The other end of the diversion pipe 115 is connected to a plurality of nozzles 116. The plurality of nozzles 116 are respectively inserted into the inner cavities of the first rapid cooling chamber 6 and the second rapid cooling chamber 7. Simultaneously with the crushing process, the vacuum pump 114 is activated to create a stable negative pressure inside the foam storage silo 111. The low-temperature cold air within the equipment frame 1, along with lightweight fine particles such as foam debris generated during crushing, is drawn into the foam storage silo 111 through the cold air recovery pipe 10. These particles undergo dual filtration and collection via a mesh cage 112 and a filter plate 113, preventing them from clogging the pipes or being drawn into the vacuum pump 114 and causing damage. The filtered clean low-temperature cold air is then transported back to the first rapid cooling chamber 6 and the second rapid cooling chamber 7 via a diversion pipe 115 and nozzle 116 to pre-cool subsequent incoming plastic materials, achieving the recycling of cold energy. Compared to existing devices, this invention solves the problems of direct discharge of cold energy after liquid nitrogen freezing, resulting in significant waste and high operating costs. It also achieves fully enclosed centralized collection of lightweight fine particles such as foam debris, preventing dust leakage and secondary pollution.

[0028] One end of the feeder 2 is inserted into the inner cavity of the feed inlet 3 and extends to the top of the sorting roller 53; the bottom inner cavity of the discharge hopper 43 and the inner cavity of the feed inlet 3 are both equipped with multiple baffles. The feeder 2 can continuously and stably transport plastic materials to the top station of the sorting roller 53, ensuring the continuous and stable operation of the sorting process; the baffles in the feed inlet 3 and the discharge hopper 43 can further reduce the leakage of cold energy inside the device, while preventing the overflow of crushing dust, improving the overall sealing and operational stability of the device, enabling the device to stably achieve integrated automatic sorting, grading and freezing, efficient crushing and cold energy recycling of rigid plastics, soft plastics and foam plastics, thus improving the overall crushing efficiency.

[0029] Working principle: First, the plastic material is fed into the equipment frame 1 through the feed inlet 3. As the soft plastic or foam falls under gravity, it is pierced by the conical spikes 531 on the sorting rollers 53 and adheres to their surface. Then, the sorting motor 54 is started, and its output drives the two sorting rollers 53 to rotate in opposite directions. During this process, multiple annular cutters 532 cut the soft plastic and roll the soft plastic attached to the conical spikes 531 into the first rapid cooling chamber 6. The electrically controlled valve 93 is opened, allowing liquid nitrogen from the high-pressure liquid nitrogen tank 91 to enter the liquid nitrogen spray hood 71 and be sprayed out through multiple nozzles 711, freezing and hardening the soft plastic. The sorting motor 54... When the output end drives the distributing roller 64 to rotate, it can convey the frozen and hardened plastic to the direct connection port 62 and into the crushing frame 4. The soft plastic that has not been hardened is relatively soft and will be rolled into its bottom end by the rotating distributing roller 64. It will then enter the second rapid cooling chamber 7 through the discharge port 61 and be frozen again by liquid nitrogen sprayed from the nozzle 711 in the second rapid cooling chamber 7. Finally, it will enter the crushing frame 4 through the hard plastic channel 8 for crushing. This ensures the degree of freeze-hardening of the soft plastic and avoids problems such as poor hardening effect causing the soft plastic to adhere to the crushing roller 41 during the crushing process, resulting in material entanglement and blockage of the crushing roller 41, overload shutdown of the device, and incomplete crushing. When the rigid plastic is impacted during its fall, it will turn and fall onto the two crushing rollers 41 inside the crushing frame 4. The crushing motor 42 is started, and the output end of the crushing motor 42 drives the crushing rollers 41 to crush the rigid plastic. The sorting roller 53 can sort foam plastic and other types of plastic during the pre-crushing process. Simultaneously with the crushing process, the vacuum pump 114 is activated. The vacuum pump 114 extracts the gas from the foam storage silo 111, creating a negative pressure inside the silo. The gas within the equipment frame 1, along with the crushed foam fragments and other light, fine particles, passes through the gaps in the crushing roller 41 and then through the cold air recovery pipe 10 into the mesh cage 112 inside the foam storage silo 111 for collection. During this process, the mesh cage 112 and the filter plate 113 effectively remove the foam fragments and other light, fine particles mixed in with the cold air. The air is filtered to prevent it from being sucked into the vacuum pump 114. The cold air is then sprayed out through the nozzle 116 after passing through the diversion pipe 115, pre-cooling the plastic material falling into the first rapid cooling chamber 6 and the second rapid cooling chamber 7, realizing the recycling of cold air and maximizing the utilization rate of liquid nitrogen. Finally, the crushed residue falls through the feed hopper 43 onto the rigid crushing feed belt and is centrally transported to the subsequent recycling process, realizing the classified crushing and integrated efficient recycling of rigid plastics, soft plastics and foam plastics.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A foam plastic scrap recycling and crushing device, characterized in that, The equipment includes a frame (1) and a feeder (2). The top of the frame (1) is provided with a feed inlet (3) that communicates with the feeder (2). The inner cavity of the frame (1) is provided with a crushing frame (4) and a soft plastic sorting section (5). A liquid nitrogen supply assembly (9) is provided on one side of the equipment frame (1). The top of the crushing frame (4) is connected to a rigid plastic channel (8). The soft plastic sorting section (5) includes a flow guide block (51) and a heat insulation plate (52) on the side wall. The flow guide block (51) is provided with two sorting rollers (53). The bottom end of the two sorting rollers (53) is provided with a first rapid cooling chamber (6). The bottom end of the first rapid cooling chamber (6) is provided with a second rapid cooling chamber (7) connected to it. One end of each of the two sorting rollers (53) is rotatably connected to the guide block (51) and is set to mesh with each other through gears. The other end of the sorting rollers (53) is connected to a sorting motor (54), which is located on the outer wall of the equipment frame (1). The outer walls of the two sorting rollers (53) are provided with a plurality of conical thorns (531) and an annular cutter (532). Both sorting rollers (53) are located in the first rapid cooling chamber (6). A discharge port (61) is provided between the first rapid cooling chamber (6) and the second rapid cooling chamber (7). A direct connection port (62) is provided between the first rapid cooling chamber (6) and the rigid plastic channel (8). A baffle plate (63) is provided in the direct connection port (62). A sorting roller (64) is rotatably connected to the side wall of the baffle plate (63). One end of the sorting roller (64) is connected to the sorting motor (54) via a belt. The bottom ends of the second rapid cooling chamber (7) and the first rapid cooling chamber (6) are both inclined, and both the second rapid cooling chamber (7) and the first rapid cooling chamber (6) are provided with liquid nitrogen spray hoods (71), and the liquid nitrogen spray hoods (71) are provided with multiple array-arranged nozzles (711). The second rapid cooling chamber (7) is connected to the rigid plastic passage (8); The bottom end of the equipment frame (1) is provided with a cold air recovery pipe (10), and the other end of the cold air recovery pipe (10) is provided with a light crushing and sorting section (11). The light crushing and sorting section (11) is connected to the inner cavity of the equipment frame (1) through the cold air recovery pipe (10).

2. The foam plastic scrap recycling and crushing device according to claim 1, characterized in that, The crushing frame (4) is provided with two crushing rollers (41). One end of the two crushing rollers (41) is connected to a crushing motor (42) via a belt drive. The crushing motor (42) is located on the side wall of the equipment frame (1). The bottom end of the crushing frame (4) is provided with a feeding hopper (43) that is connected to the cold air recovery pipe (10).

3. The foam plastic scrap recycling and crushing device according to claim 1, characterized in that, The liquid nitrogen supply assembly (9) includes a high-pressure liquid nitrogen tank (91), one end of which is provided with a conduit (92), and an electrically controlled valve (93) is provided on the conduit (92).

4. The foam plastic scrap recycling and crushing device according to claim 1, characterized in that, The top of the flow guide block (51) is provided with multiple arc-shaped plates (511) arranged in an array. The insulation board (52) is arc-shaped and has multiple arrayed inserts (521) on its inner sidewall.

5. The foam plastic scrap recycling and crushing device according to claim 1, characterized in that, The lightweight crushing and sorting section (11) includes a foam storage bin (111) connected to a cold air recovery pipe (10). The inner cavity of the foam storage bin (111) is provided with a mesh cage (112). The top of the mesh cage (112) is provided with a filter plate (113). The top of the filter plate (113) is provided with a vacuum pump (114). The output end of the vacuum pump (114) is connected to a diversion pipe (115). The other end of the diversion pipe (115) is connected to a plurality of nozzles (116). The plurality of nozzles (116) are respectively inserted into the inner cavities of the first rapid cooling chamber (6) and the second rapid cooling chamber (7).

6. The foam plastic scrap recycling and crushing device according to claim 2, characterized in that, One end of the feeder (2) is inserted into the inner cavity of the feed inlet (3) and extends to the top of the sorting roller (53); The bottom cavity of the hopper (43) and the inner cavity of the feed inlet (3) are both provided with multiple wind baffles.

Images