Multi-stage separation plastic crushing dust recovery device

Abstract

The invention relates to the technical field of plastic recovery, and discloses a multi-stage separation plastic crushing dust recovery device which comprises a cleaning separation tank used for storing clean water, a material stirring assembly is arranged on the cleaning separation tank, and an L-shaped tank frame used for installing a conveying belt is arranged on the rear portion of the upper end of the cleaning separation tank. Heating box bodies distributed at equal intervals up and down are further arranged in the L-shaped groove frame and located on the inner side of the vertical part of the conveying belt. A first servo motor drives a conveying belt to convey plastic floating on the surface of clear water to the connecting shell, meanwhile, a smashing roller is made to smash the plastic entering the connecting shell, air is sprayed out of a spraying groove in a heating box body, the plastic is sprayed out through a spraying groove in the heating box body, and therefore the plastic can be separated from the heating box body. When the hot air is in contact with the plastic on the scraping plate, the plastic can be quickly dried; and the air sprayed by the air nozzle blows light dust in the plastic, and the light dust is discharged through the discharge port and then is recycled.

Description

Technical Field

[0001] The invention relates to the technical field of plastic recycling, in particular to a multi-stage separation plastic crushing dust recycling device. Background Art

[0002] In the field of plastic recycling, traditional plastic separation methods have many shortcomings. On the one hand, in the past, there may have been a lack of effective means to preliminarily clean plastics and to preliminarily separate them by characteristics (such as cleanliness, weight, volume, etc.), resulting in more plastic impurities entering the subsequent processing links, affecting the subsequent processing effect and recycling quality. On the other hand, in the plastic crushing and screening links, traditional methods may not be able to achieve efficient and accurate separation. There may be low efficiency of crushing equipment, which cannot quickly crush plastics into a state suitable for screening, and the screening device may not be able to distinguish between light dust and heavy plastics well, resulting in incomplete separation and low purity of recycled plastics. Additional processing steps are required for further purification, which increases recycling costs and time.

[0003] Traditional plastic recycling processes often do not pay enough attention to dust recovery and lack effective dust collection and treatment mechanisms. A large amount of light dust will be generated during the plastic crushing process. If this dust is not recycled, it will cause a waste of resources and be directly discharged into the environment, which will also cause air pollution. To this end, we have launched a multi-stage separation plastic crushing dust recovery device. Summary of the invention

[0004] The object of the present invention is to provide a multi-stage separation plastic crushing dust recovery device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: a multi-stage separation plastic crushing dust recovery device, comprising a cleaning and separation tank for storing clean water, wherein the cleaning and separation tank is provided with a material shifting assembly, and the material shifting assembly is used to shift the plastic floating on the surface of the clean water backward; An L-shaped slot frame for installing a conveyor belt is provided at the rear of the upper end of the cleaning and separation tank, and a heating box body is also provided inside the L-shaped slot frame with equal spacing between the upper and lower parts, and the heating box body is located on the inner side of the vertical part of the conveyor belt; The bottom of the rear end of the L-shaped trough frame is connected to a separation tank by a connecting shell, and the conveyor belt is driven by a first servo motor to convey the plastic floating on the surface of the clean water to the connecting shell; The first servo motor also drives the air collecting fan blades located in the protective housing and the crushing roller located inside the connecting shell; The protective shell is respectively communicated with the heating box body, the aeration pipe in the cleaning and separation tank, and the gas collection nozzle inside the separation tank.

[0006] Preferably, the material dispensing assembly includes two groups of front and rear material dispensing rollers fixed on the cleaning and separation tank by a vertical plate, one group of material dispensing rollers is driven by a second servo motor on the vertical plate, the other end of the material dispensing roller passes through the vertical plate and is connected to a first pulley, and a first belt is connected between the two groups of first pulleys.

[0007] Preferably, the vertical portion of the L-shaped trough frame is provided with a top roller and a lower roller distributed up and down, the rear end of the horizontal portion of the L-shaped trough frame is provided with a rear roller of the same height as the top roller, and the rear roller, the top roller and the lower roller are connected between the conveyor belts; A scraper plate is arranged on the outside of the conveyor belt, and air holes are evenly distributed on the surface of the conveyor belt.

[0008] Preferably, the first servo motor is fixed to the outer side wall of the horizontal part of the L-shaped slot frame, and one end of the rear roller is connected to the output end of the first servo motor, the other end of the rear roller is extended into the protective shell and connected to the second pulley and the driving gear, one end of the crushing roller is extended out of the connecting shell and connected to the third pulley, and a second belt is connected between the second pulley and the third pulley; The air collecting fan blades are movably connected to the outer side wall of the horizontal part of the L-shaped slot frame by a rotating shaft, and a driven gear is also fixed on the rotating shaft, and the driven gear is meshed with the driving gear.

[0009] Preferably, the protective shell is fixed to the outer side wall of the horizontal portion of the L-shaped slot frame, and the second pulley, the third pulley, the second belt, the driven gear, the driving gear and the air collecting fan blades are located inside the protective shell; An air inlet groove is arranged at the upper end of the horizontal part of the L-shaped groove frame, and an air outlet groove is arranged at the side of the horizontal part of the L-shaped groove frame. The air inlet groove is connected with the protective shell through the air outlet groove.

[0010] Preferably, the heating box body is inserted into the slot of the L-shaped slot frame, and a limit plate is provided at the end of the heating box body, and the heating box body forms two groups of front and rear cavities through a partition in the middle thereof, and spiral heating wires are provided at the upper and lower parts of the cavities; The outer side of the cavity is provided with a spraying groove, which is located in the middle of the front and rear side walls of the heating box body. The upper and lower ends of the spraying groove are provided with inclined surfaces, so that the spraying groove is trumpet-shaped.

[0011] Preferably, the lower side of the protective shell is connected to a gas collecting box through a first pipe, the gas collecting box is connected to the opening on the limit plate through a second pipe, and the opening is connected to the upper and lower parts of the cavity; The bottom of the gas collecting box is connected to the aeration pipe in the cleaning and separation tank through a third pipe; The rear side of the lower part of the gas collecting box body is connected to the gas collecting nozzle inside the separation tank through a fourth pipeline.

[0012] Preferably, the inner rear side wall of the connecting shell is provided with an inclined block located below the crushing roller, the inner rear side wall of the separation tank is provided with a downwardly inclined first sieve plate, the inner front side wall of the separation tank is provided with a downwardly inclined second sieve plate, the first sieve plate is located above the second sieve plate, the air collecting nozzle is located at a height between the first sieve plate and the second sieve plate, and a plurality of groups of air nozzles are also connected to the rear end of the air collecting nozzle.

[0013] Preferably, a discharge port is provided at the rear of the separation tank, and the height of the discharge port is located between the first sieve plate and the second sieve plate.

[0014] Compared with the prior art, the invention has the following beneficial effects: the invention drives the conveyor belt to convey the plastic floating on the surface of the clean water to the connecting shell through the first servo motor, and at the same time, the crushing roller crushes the plastic entering the connecting shell, and at the same time, air is ejected from the ejection slot on the heating box body, and the hot air is ejected to the outer surface of the conveyor belt through the air vents, and when the hot air contacts the plastic on the scraper plate, the plastic is quickly dried. The light dust in the plastic falls from the sieve holes after being filtered by the first sieve plate. At this time, the air ejected from the air nozzle will blow up the light dust in the plastic and then discharge it through the discharge port for recovery. Part of the air is introduced into the clean water in the cleaning and separation tank through the third pipe and the aeration pipe. Firstly, the clean water is aerated to prevent the clean water from lacking oxygen and stinking. Secondly, the air is introduced into the clean water so that the air contacts the plastic at the bottom of the clean water to impact the dust or dirt on the surface of the plastic, thereby cleaning the plastic and making the plastic float on the surface of the clean water after cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention as a whole; Figure 2 It is a second three-dimensional structural schematic diagram of the present invention as a whole; Figure 3 It is a schematic diagram of the three-dimensional structure of the connection between the heating box body and the gas collecting box body of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the heating box body of the present invention; Figure 5 It is a schematic cross-sectional view of the heating box body of the present invention; Figure 6 It is a schematic diagram of the structure of the spiral heating wire of the present invention; Figure 7 It is a schematic diagram of the structure of the connection between the second belt, the third pulley, the driving gear, the air collecting fan blade and the driven gear of the present invention; Figure 8 A schematic diagram of the structure of the heating box body of the present invention; Fig. 9 It is a schematic cross-sectional structure diagram of the present invention as a whole; Fig.10 This is a schematic diagram of the structure of the crushing roller arrangement of the present invention.

[0016] In the figure: 1, cleaning and separation tank; 2, second servo motor; 3, vertical plate; 4, third pipeline; 41, aeration pipe; 5, first belt; 51, first pulley; 6, material-dispensing roller; 7, gas collecting box; 71, second pipeline; 8, L-shaped slot frame; 81, air inlet slot; 82, air outlet slot; 9, fourth pipeline; 91, air collecting nozzle; 92, air nozzle; 10, first pipeline; 11, protective shell; 12, connecting shell; 13, first servo motor; 131, second belt; 132, third pulley; 133, Driving gear; 134, air collecting fan blade; 135, driven gear; 136, rear roller; 137, top roller; 138, lower roller; 14, conveyor belt; 141, scraper plate; 142, air vent; 15, second sieve plate; 16, separation tank; 17, discharge port; 18, heating box body; 181, ejection slot; 182, limit plate; 183, opening; 184, spiral heating wire; 185, partition; 186, inclined surface; 187, cavity; 19, crushing roller; 20, first sieve plate; 21, inclined block. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-10 , the present invention provides a technical solution: A multi-stage separation plastic crushing dust recovery device, comprising a cleaning separation tank 1 for storing clean water, wherein the preliminarily crushed plastic is put into the cleaning separation tank 1, and clean or light (small volume) plastic will float on the surface of the clean water, while dirty or large volume plastic will be located in the lower layer of the clean water; A material shifting assembly is provided on the cleaning and separation tank 1, and the material shifting assembly is used to shift the plastic floating on the surface of the clean water backwards; like Figure 1-2 As shown, the material dispensing assembly includes two sets of front and rear material dispensing rollers 6 fixed on the cleaning and separation tank 1 by a vertical plate 3. One set of material dispensing rollers 6 is driven by a second servo motor 2 on the vertical plate 3. The other end of the material dispensing roller 6 passes through the vertical plate 3 and is connected to a first pulley 51. A first belt 5 is connected between the two sets of first pulleys 51.

[0019] The second servo motor 2 is controlled by PLC. The second servo motor 2 drives the rear material-dispensing roller 6 to rotate clockwise. At the same time, the rear material-dispensing roller 6 also drives the front material-dispensing roller 6 to rotate clockwise through the first belt 5, so that after the paddle on the material-dispensing roller 6 is immersed in the upper layer of clean water, the plastic floating on the surface of the clean water is pushed backward.

[0020] The movement of the paddle on the paddle roller 6 on the plastic can also effectively remove dust and dirt on the surface of the plastic, thereby improving the cleaning efficiency.

[0021] An L-shaped slot frame 8 for mounting a conveyor belt 14 is provided at the rear portion of the upper end of the cleaning and separation tank 1; The conveyor belt 14 is driven by the first servo motor 13 to convey the plastic floating on the surface of the clean water to the connecting shell 12; like Figure 8-10 As shown, a top roller 137 and a lower roller 138 are arranged in the vertical part of the L-shaped groove frame 8, and a rear roller 136 having the same height as the top roller 137 is arranged at the rear end of the horizontal part of the L-shaped groove frame 8, and the rear roller 136, the top roller 137 and the lower roller 138 are connected between the conveyor belt 14; The first servo motor 13 is controlled by PLC. The first servo motor 13 drives the rear roller 136 to rotate counterclockwise, so that the conveyor belt 14 rotates counterclockwise. The rear roller 136 drives the conveyor belt 14. At this time, the lower roller 138 is in a driven state. Under the joint action of the top roller 137, it is used to tighten the conveyor belt 14. In addition, the top roller 137 also plays a role in changing the direction of the conveyor belt 14, so that the conveyor belt 14 moves vertically upward and then passes through the top roller 137 and then moves horizontally backward. like Figure 2 As shown, a scraper plate 141 is provided on the outside of the conveyor belt 14, and air holes 142 are evenly distributed on the surface of the conveyor belt 14. When the conveyor belt 14 rotates counterclockwise, the scraper plate 141 on the conveyor belt 14 conveys the plastic floating on the surface of the clean water to the connecting shell 12. During the upward vertical movement, the clean water on the plastic quickly falls to the cleaning and separation tank 1 under the action of its own gravity; The hot air ejected through the ejection slot 181 is ejected toward the outer surface of the conveyor belt 14 through the air holes 142 , and when the hot air contacts the plastic on the scraper plate 141 , the plastic is quickly dried.

[0022] The L-shaped slot frame 8 is also provided with a heating box 18 with equal spacing up and down, and the heating box 18 is located on the inner side of the vertical portion of the conveyor belt 14; like Figure 4-6As shown, the heating box body 18 is inserted into the slot of the L-shaped slot frame 8, and a stop plate 182 is provided at the end of the heating box body 18. The heating box body 18 forms two groups of front and rear cavities 187 through a partition 185 in the middle thereof, and spiral heating wires 184 are provided at the upper and lower parts of the cavities 187; An ejection slot 181 is provided on the outside of the cavity 187. The ejection slot 181 is located in the middle of the front and rear side walls of the heating box body 18. The upper and lower ends of the ejection slot 181 are provided with inclined surfaces 186, so that the ejection slot 181 is trumpet-shaped. Such a configuration can increase the speed and strength of the ejection of the hot air in the cavity 187 when it is ejected through the ejection slot 181, ensuring that the hot air can be ejected to the outer surface of the conveyor belt 14 through the air vent 142 and then contact the plastic on the scraper plate 141; The spiral heating wire 184 is powered on by PLC control. After the spiral heating wire 184 is powered on, the air in the cavity 187 is quickly heated. Subsequently, after the outside air enters the cavity 187, the hot air in the cavity 187 is ejected through the ejection groove 181 until the hot air is ejected toward the outer surface of the conveyor belt 14 through the air vent 142. When the hot air contacts the plastic on the scraper plate 141, the plastic is quickly dried.

[0023] The bottom of the rear end of the L-shaped trough frame 8 is connected to a separation tank 16 by a connecting shell 12; The rear side wall inside the connecting shell 12 is provided with an inclined block 21 located below the crushing roller 19. After the crushing roller 19 crushes the plastic, the plastic falls to the inclined block 21. Under the blocking and moving action of the inclined block 21, the plastic will not be blocked, and then the plastic will fall to the first screen plate 20. A first sieve plate 20 inclined downward is provided on the rear side wall inside the separation tank 16, and a second sieve plate 15 inclined downward is provided on the front side wall inside the separation tank 16. The first sieve plate 20 is located above the second sieve plate 15, and the gas collecting nozzle 91 is located at a height between the first sieve plate 20 and the second sieve plate 15, and a plurality of gas nozzles 92 are also connected to the rear end of the gas collecting nozzle 91.

[0024] A discharge port 17 is provided at the rear of the separation tank 16 , and the height of the discharge port 17 is located between the first sieve plate 20 and the second sieve plate 15 .

[0025] like Fig.10 As shown, the light dust in the plastic falls from the sieve holes after being filtered by the first sieve plate 20. At this time, the air ejected from the air nozzle 92 will blow up the light dust in the plastic and then be discharged through the discharge port 17 for recovery; The heavier part of the plastic will fall along the front bottom of the first sieve plate 20 to the second sieve plate 15, and finally fall into the separation tank 16 for standby use.

[0026] The first servo motor 13 also drives the air collecting blades 134 located in the protective housing 11 and the crushing roller 19 located inside the connecting housing 12; like Figure 7 As shown, the first servo motor 13 is fixed to the outer side wall of the horizontal part of the L-shaped slot frame 8, and one end of the rear roller 136 is connected to the output end of the first servo motor 13, and the other end of the rear roller 136 is extended into the protective shell 11 and connected to the second pulley and the driving gear 133, and one end of the crushing roller 19 is extended out of the connecting shell 12 and connected to the third pulley 132, and the second belt 131 is connected between the second pulley and the third pulley 132; The air collecting blades 134 are movably connected to the outer side wall of the horizontal portion of the L-shaped slot frame 8 by a rotating shaft, and a driven gear 135 is also fixed on the rotating shaft, and the driven gear 135 is meshed with the driving gear 133 .

[0027] The outer diameter of the second pulley is greater than the outer diameter of the third pulley 132, so that when the rear roller 136 rotates, the crushing roller 19 is driven to rotate, and the rotation speed of the crushing roller 19 is increased, so that after the plastic enters the connecting shell 12, the crushing roller 19 can quickly crush the plastic; The diameter of the driving gear 133 is greater than the diameter of the driven gear 135, so that when the rear roller 136 rotates, the air collecting blades 134 are driven to rotate, and the rotation speed of the air collecting blades 134 is fast, so that the air collecting blades 134 form a negative pressure in the protective shell 11; The protective housing 11 is fixed to the outer side wall of the horizontal portion of the L-shaped slot frame 8, and the second pulley, the third pulley 132, the second belt 131, the driven gear 135, the driving gear 133 and the air collecting fan blade 134 are located inside the protective housing 11, so that the protective housing 11 plays a protective role; An air inlet groove 81 is provided at the upper end of the horizontal part of the L-shaped slot frame 8, and an air outlet groove 82 is provided on the side of the horizontal part of the L-shaped slot frame 8. The air inlet groove 81 is connected with the protective shell 11 through the air outlet groove 82. After the air collecting fan blades 134 rotate at a high speed to form a negative pressure in the protective shell 11, the outside air quickly enters the air collecting fan blades 134 through the air inlet groove 81 and the air outlet groove 82, so that the air in the air collecting fan blades 134 can be discharged through the first pipe 10.

[0028] The protective shell 11 is respectively connected to the heating box body 18, the aeration pipe 41 in the cleaning and separation tank 1, and the gas collection nozzle 91 inside the separation tank 16.

[0029] The lower side of the protective shell 11 is connected to the gas collecting box body 7 through the first pipe 10, and the gas collecting box body 7 is connected to the opening 183 on the limit plate 182 through the second pipe 71, and the opening 183 is connected to the upper and lower parts of the cavity 187; The bottom of the gas collecting box 7 is connected to the aeration pipe 41 in the cleaning and separation tank 1 through the third pipe 4; The lower rear side of the air collection box body 7 is communicated with the air collection nozzle 91 inside the separation tank 16 through the fourth pipeline 9.

[0030] After the air collection fan blade 134 rotates at a high speed to form a negative pressure inside the protective housing 11, the outside air quickly enters the air collection fan blade 134 through the air inlet groove 81 and the air outlet groove 82, and then is discharged into the air collection box body 7 through the first pipeline 10. At this time, a part of the air enters the cavity 187 through the second pipeline 71 and the opening 183, and sprays the hot air inside the cavity 187 through the spraying groove 181. A part of the air enters the air collection nozzle 91 through the fourth pipeline 9, and is finally sprayed out through the jet nozzle 92. After blowing up the light dust in the plastic, it is discharged through the discharge port 17 and recycled. Finally, a part of the air is introduced into the clear water in the cleaning and separation tank 1 through the third pipeline 4 and the air diffuser pipe 41. On the one hand, it aerates the clear water to prevent the clear water from lacking oxygen and emitting an odor. On the other hand, the air is introduced into the clear water so that the air contacts the plastic at the bottom of the clear water to impact the dust or soil on the surface of the plastic, realizing the cleaning of the plastic. After cleaning, the plastic can float on the surface of the clear water.

[0031] Specifically, during use, in the cleaning stage: the preliminarily crushed plastic is put into the cleaning and separation tank 1 storing clear water. The air collection fan blade 134 rotates at a high speed to form a negative pressure inside the protective housing 11. The outside air enters the air collection fan blade 134 through the air inlet groove 81 and the air outlet groove 82, and then enters the air collection box body 7 through the first pipeline 10. A part of the air is introduced into the clear water through the third pipeline 4 and the air diffuser pipe 41. On the one hand, the air aerates the clear water to prevent it from emitting an odor. On the other hand, it impacts the dust or soil on the surface of the plastic, making the cleaned plastic float on the surface of the clear water.

[0032] In the conveying stage: the second servo motor 2 drives the rear feeding roller 6 to rotate clockwise, drives the front feeding roller 6 to rotate clockwise through the first belt 5, and the baffle on the feeding roller 6 pushes the plastic floating on the surface of the clear water backward to the conveyor belt 14. The first servo motor 13 drives the rear roller 136 to rotate counterclockwise, making the conveyor belt 14 rotate counterclockwise, and the scraping plate 141 on the conveyor belt 14 conveys the plastic to the connection shell 12.

[0033] In the drying stage: the spiral heating wire 184 in the heating box body 18 in the L-shaped groove frame 8 is energized to quickly heat the air inside the cavity 187. A part of the air introduced by the air collection fan blade 134 enters the cavity 187 through the second pipeline 71 and the opening 183, and sprays the hot air through the spraying groove 181. The hot air contacts the plastic on the scraping plate 141 through the air permeable holes 142 on the surface of the conveyor belt 14, realizing the rapid drying of the plastic.

[0034] Crushing stage: The first servo motor 13 drives the rear roller 136 to rotate, and drives the crushing roller 19 to rotate through the second pulley, the second belt 131 and the third pulley 132, so as to quickly crush the plastic conveyed to the connecting shell 12. The crushed plastic falls to the inclined blocks 21, which are staggered up and down. Under the blocking and moving action of the inclined blocks 21, the plastic will not be blocked and falls to the first screen plate 20.

[0035] Separation stage: Light dust in the plastic falls through the sieve holes of the first sieve plate 20, and part of the air introduced by the air collecting blades 134 enters the air collecting nozzle 91 through the fourth pipe 9, and is then ejected by the air nozzle 92, blowing the light dust out through the discharge port 17 for recovery; the heavier plastic falls along the bottom of the front end of the first sieve plate 20 to the second sieve plate 15, and finally falls into the separation tank 16 for standby use.

[0036] Efficient cleaning and transportation: Cleaning plastics through aeration can effectively remove dust and dirt on the surface of plastics, while preventing the clean water from lacking oxygen and stinking. The coordination of the material shifting assembly and the conveyor belt assembly enables efficient transportation of plastics from the cleaning tank to the subsequent processing links.

[0037] Rapid drying: The air holes 142 of the heating box 18 and the conveyor belt 14 are designed to allow hot air to fully contact the plastic, achieving rapid drying and improving processing efficiency.

[0038] Crushing: The crushing roller 19 rotates at high speed to achieve rapid crushing of the plastic.

[0039] Multi-stage separation: The cooperation of the first sieve plate 20, the second sieve plate 15 and the air nozzle 92 is adopted to realize the effective separation of light dust and heavy plastics, thereby improving the recycling quality.

[0040] Reasonable power utilization: the first servo motor 13 drives the conveyor belt 14, the air collecting fan blades 134 and the crushing roller 19 at the same time, and realizes different speed requirements of different components through belt transmission and gear transmission, thereby improving energy utilization efficiency.

[0041] Multi-stage separation: Cleaning and separation: The clean water in the cleaning and separation tank 1 is used to separate the initially crushed plastics. Clean or light plastics float on the surface of the clean water, while dirty or bulky plastics are located in the lower layer of the clean water, thus achieving preliminary material separation. At the same time, the paddle of the material prying assembly can effectively remove dust and dirt on the surface of the plastics while prying the floating plastics, further improving the separation effect and providing purer materials for subsequent processing.

[0042] Crushing and separation: The first servo motor 13 drives the crushing roller 19 to quickly crush the plastic delivered to the connecting shell 15, and the plastic smoothly falls to the first screen plate 20 in the separation tank 16 to prepare for subsequent screening and separation.

[0043] Screening and separation: The separation tank 16 is provided with a first sieve plate 20 and a second sieve plate 15 which are inclined up and down. The light dust in the plastic falls from the sieve hole after being filtered by the first sieve plate 20, while the heavier part falls along the bottom of the front end of the first sieve plate 20 to the second sieve plate 15, and finally falls into the separation tank 16 for standby, thus achieving effective separation of light dust and heavy plastics and improving the quality of recycled plastics. This multi-stage separation method gradually processes plastics from cleaning, crushing to screening, improves the accuracy and efficiency of separation, and enables materials with different characteristics to be effectively distinguished and processed.

[0044] Dust recovery: Active collection: The first servo motor 13 drives the air collecting blades 134 to rotate at high speed, forming a negative pressure in the protective housing 11, and the outside air quickly enters the protective housing 11 through the air inlet groove 81 and the air outlet groove 82, and then is discharged to the air collecting box body 7 through the first pipeline 10. The air collecting box body 7 is connected with the heating box body 18, the aeration pipe 41 in the cleaning and separation tank 1, and the air collecting nozzle 91 inside the separation tank 16, so that the air can circulate in the device, providing power support for dust recovery.

[0045] Targeted recovery: In the separation tank 16, air is ejected through the air nozzle 92 at the rear end of the air collecting nozzle 91, and the light dust filtered and fallen through the first sieve plate 20 is blown up and discharged through the discharge port 17 for recovery, thereby achieving effective collection of light dust in the plastic, avoiding the loss of dust, improving the dust recovery efficiency, reducing environmental pollution, and also enabling the recovered dust to be further processed or utilized.

[0046] Recycling: In the whole process, air is not only used for dust recovery, but also for aerating the clean water in the cleaning and separation tank 1 to prevent the clean water from lacking oxygen and stinking, and to impact the dust or mud on the surface of the plastic at the bottom of the clean water to assist in the cleaning of the plastic; at the same time, the air also participates in the hot air circulation of the heating box 18 to achieve rapid drying of the plastic. This recycling of air improves the efficiency of energy utilization, reduces operating costs, and makes the dust recovery process more environmentally friendly and efficient.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage separation plastic crushing dust recovery device, including a cleaning and separation tank for storing clean water, characterized in that: The cleaning and separation tank is provided with a material shifting assembly, which is used to shift the plastic floating on the surface of the clean water backwards; An L-shaped slot frame for installing a conveyor belt is provided at the rear of the upper end of the cleaning and separation tank, and a heating box body is also provided inside the L-shaped slot frame with equal spacing between the upper and lower parts, and the heating box body is located on the inner side of the vertical part of the conveyor belt; The bottom of the rear end of the L-shaped trough frame is connected to a separation tank by a connecting shell, and the conveyor belt is driven by a first servo motor to convey the plastic floating on the surface of the clean water to the connecting shell; The first servo motor also drives the air collecting fan blades located in the protective housing and the crushing roller located inside the connecting shell; The protective shell is respectively communicated with the heating box body, the aeration pipe in the cleaning and separation tank, and the gas collection nozzle inside the separation tank.

2. The multi-stage separation plastic crushing dust recovery device according to claim 1 is characterized by: The material dispensing assembly includes two front and rear groups of material dispensing rollers fixed on the cleaning and separation tank by a vertical plate. One group of material dispensing rollers is driven by a second servo motor on the vertical plate. The other end of the material dispensing roller passes through the vertical plate and is connected to a first pulley. A first belt is connected between the two groups of first pulleys.

3. The multi-stage separation plastic crushing dust recovery device according to claim 1 is characterized by: The vertical portion of the L-shaped trough frame is provided with a top roller and a lower roller distributed up and down, and the rear end of the horizontal portion of the L-shaped trough frame is provided with a rear roller of the same height as the top roller, and the rear roller, the top roller and the lower roller are connected between the conveyor belts; A scraper plate is arranged on the outside of the conveyor belt, and air holes are evenly distributed on the surface of the conveyor belt.

4. The multi-stage separation plastic crushing dust recovery device according to claim 1 is characterized by: The first servo motor is fixed to the outer side wall of the horizontal part of the L-shaped slot frame, and one end of the rear roller is connected to the output end of the first servo motor, the other end of the rear roller is extended into the protective shell and connected to the second pulley and the driving gear, one end of the crushing roller is extended out of the connecting shell and connected to the third pulley, and a second belt is connected between the second pulley and the third pulley; The air collecting fan blades are movably connected to the outer side wall of the horizontal part of the L-shaped slot frame by a rotating shaft, and a driven gear is also fixed on the rotating shaft, and the driven gear is meshed with the driving gear.

5. The multi-stage separation plastic crushing dust recovery device according to claim 4 is characterized by: The protective shell is fixed to the outer side wall of the horizontal part of the L-shaped slot frame, and the second pulley, the third pulley, the second belt, the driven gear, the driving gear and the air collecting fan blades are located inside the protective shell; An air inlet groove is arranged at the upper end of the horizontal part of the L-shaped groove frame, and an air outlet groove is arranged at the side of the horizontal part of the L-shaped groove frame. The air inlet groove is connected with the protective shell through the air outlet groove.

6. The multi-stage separation plastic crushing dust recovery device according to claim 1 is characterized by: The heating box body is inserted into the slot of the L-shaped slot frame, and a limit plate is provided at the end of the heating box body. The heating box body forms two groups of front and rear cavities through the partition in the middle thereof, and spiral heating wires are provided at the upper and lower parts of the cavities; The outer side of the cavity is provided with a spraying groove, which is located in the middle of the front and rear side walls of the heating box body. The upper and lower ends of the spraying groove are provided with inclined surfaces, so that the spraying groove is trumpet-shaped.

7. The multi-stage separation plastic crushing dust recovery device according to claim 6, characterized in that: The lower side of the protective shell is connected to a gas collecting box through a first pipe, the gas collecting box is connected to the opening on the limit plate through a second pipe, and the opening is connected to the upper and lower parts of the cavity; The bottom of the gas collecting box is connected to the aeration pipe in the cleaning and separation tank through a third pipe; The rear side of the lower part of the gas collecting box body is connected to the gas collecting nozzle inside the separation tank through a fourth pipeline.

8. The multi-stage separation plastic crushing dust recovery device according to claim 1 is characterized by: The inner rear side wall of the connecting shell is provided with an inclined block located below the crushing roller, the inner rear side wall of the separation tank is provided with a downwardly inclined first sieve plate, the inner front side wall of the separation tank is provided with a downwardly inclined second sieve plate, the first sieve plate is located above the second sieve plate, the air collecting nozzle is located at a height between the first sieve plate and the second sieve plate, and the rear end of the air collecting nozzle is also connected to a plurality of groups of air nozzles.

9. The multi-stage separation plastic crushing dust recovery device according to claim 8, characterized in that: A discharge port is provided at the rear of the separation tank, and the height of the discharge port is located between the first sieve plate and the second sieve plate.

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