A multi-stage separation plastic crushing dust recovery device

Abstract

The present invention relates to the field of plastic recycling technology, and discloses a multi-stage separation plastic crushing dust recovery device, comprising a cleaning and separation tank for storing clean water, a material stripping assembly being provided on the cleaning and separation tank, an L-shaped slot frame being provided at the rear portion of the upper end of the cleaning and separation tank for installing a conveyor belt, a heating box body being also provided inside the L-shaped slot frame, which is evenly spaced up and down, and the heating box body being located on the inner side of the vertical portion of the conveyor belt; a separation tank is connected to the bottom portion of the rear end of the L-shaped slot frame by a connecting shell; the present invention drives the conveyor belt to transport the plastic floating on the surface of the clean water to the connecting shell by a first servo motor, while the crushing roller crushes the plastic entering the connecting shell, and air is ejected from the ejection slot on the heating box body, and when the hot air contacts the plastic on the scraper plate, the plastic is quickly dried; the air ejected through the air nozzle will blow up the lightweight dust in the plastic and discharge it through the discharge port for recovery.

Description

Technical Field

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

[0002] In the field of plastics recycling, traditional plastic separation methods have many shortcomings. For one thing, there may have been a lack of effective means for initial cleaning of plastics and initial stratification and separation based on characteristics (such as cleanliness, weight, and volume). This has resulted in a high level of plastic impurities entering subsequent processing, impacting both the effectiveness of subsequent processing and the quality of recycling. On the other hand, traditional methods may not achieve efficient and precise separation in the plastic crushing and screening stages. Crushing equipment may be inefficient, unable to quickly crush the plastic into a state suitable for screening, and screening devices may not be able to effectively distinguish between light dust and heavy plastics, resulting in incomplete separation and low purity of the recycled plastic. Additional processing steps may be required for further purification, increasing recycling costs and time.

[0003] Traditional plastic recycling processes often neglect dust recovery and lack effective dust collection and treatment mechanisms. The plastic crushing process generates a large amount of lightweight dust. If this dust is not recovered, it wastes resources and is directly discharged into the environment, causing air pollution. To address this, we have developed 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 objectives, the present invention provides the following technical solutions: a multi-stage separation plastic crushing and 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 for shifting plastic floating on the surface of the clean water backwards;

[0006] The upper rear part of the cleaning and separation tank is provided with an L-shaped slot frame for installing the conveyor belt, and the L-shaped slot frame is further provided with heating boxes distributed at equal intervals above and below, and the heating boxes are located on the inner side of the vertical part of the conveyor belt;

[0007] 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;

[0008] 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;

[0009] 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.

[0010] Preferably, the material dispensing assembly includes two sets of front and rear material dispensing rollers fixed on the cleaning and separation tank by a vertical plate. One set 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 sets of first pulleys.

[0011] 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;

[0012] A scraper is provided on the outside of the conveyor belt, and ventilation holes are evenly distributed on the surface of the conveyor belt.

[0013] Preferably, the first servo motor is fixed to the outer side wall of the horizontal portion 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 housing and is connected to the second pulley and the driving gear, one end of the crushing roller extends out of the connecting housing and is connected to the third pulley, and a second belt is connected between the second pulley and the third pulley;

[0014] The air collecting fan blades are movably connected to the outer side wall of the horizontal portion of the L-shaped slot frame by a rotating shaft, and a driven gear is fixed on the rotating shaft, and the driven gear is meshed with the driving gear.

[0015] 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;

[0016] An air inlet groove is provided at the upper end of the horizontal portion of the L-shaped groove frame, and an air outlet groove is provided at the side of the horizontal portion of the L-shaped groove frame. The air inlet groove is communicated with the protective shell through the air outlet groove.

[0017] 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. 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;

[0018] An ejection slot is provided on the outside of the cavity and is located in the middle of the front and rear side walls of the heating box body. Inclined surfaces are provided at the upper and lower ends of the ejection slot, so that the ejection slot is trumpet-shaped.

[0019] 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;

[0020] The bottom of the gas collecting box is connected to the aeration pipe in the cleaning and separation tank through a third pipe;

[0021] The rear side of the lower portion of the gas collecting box body is communicated with the gas collecting nozzle inside the separation tank through a fourth pipe.

[0022] 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 the rear end of the air collecting nozzle is also connected to several groups of air nozzles.

[0023] 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.

[0024] Compared with existing technologies, the present invention has the following advantages: A first servo motor drives a conveyor belt to transport plastic floating on the surface of the clear water to the connecting shell, while a crushing roller crushes the plastic entering the connecting shell. Simultaneously, air is ejected from the ejection slots on the heating box body, and the hot air is sprayed through the air holes onto the outer surface of the conveyor belt. When the hot air contacts the plastic on the scraper, it quickly dries the plastic.

[0025] 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 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, it aerates the clean water 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 it float on the surface of the clean water after cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the first three-dimensional structure of the present invention as a whole;

[0027] Figure 2 It is a second three-dimensional structural schematic diagram of the present invention as a whole;

[0028] Figure 3 This 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;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the heating box body of the present invention;

[0030] Figure 5 Schematic diagram of the cross-sectional structure of the heating box body of the present invention;

[0031] Figure 6 A schematic diagram of the structure of the spiral heating wire of the present invention;

[0032] Figure 7 This is a schematic structural diagram of the connection between the second belt, the third pulley, the driving gear, the air collecting fan blades and the driven gear of the present invention;

[0033] Figure 8 A schematic diagram of the structure of the heating box body of the present invention;

[0034] Figure 9 It is a schematic cross-sectional structural diagram of the present invention as a whole;

[0035] Figure 10 This is a schematic structural diagram of the crushing roller arrangement of the present invention.

[0036] 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, feeding 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 housing; 12, connecting housing; 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

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0038] See also Figure 1-10 , the present invention provides a technical solution:

[0039] A multi-stage separation plastic crushing dust recovery device includes a cleaning and separation tank 1 for storing clean water. The preliminarily crushed plastic is put into the cleaning and separation tank 1. Clean or light (small) plastic will float on the surface of the clean water, while dirty or large plastic will be located in the lower layer of the clean water.

[0040] The cleaning and separation tank 1 is provided with a material shifting assembly, which is used to shift the plastic floating on the surface of the clean water backwards;

[0041] 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 the 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 the first pulley 51. The first belt 5 is connected between the two sets of first pulleys 51.

[0042] 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 the paddle on the material-dispensing roller 6 is immersed in the upper layer of clean water, and the plastic floating on the surface of the clean water is shifted backward.

[0043] 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.

[0044] 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;

[0045] 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;

[0046] like Figure 8-10 As shown, a top roller 137 and a lower roller 138 are provided in the vertical portion of the L-shaped channel frame 8, and a rear roller 136 having the same height as the top roller 137 is provided at the rear end of the horizontal portion of the L-shaped channel frame 8. The rear roller 136, the top roller 137 and the lower roller 138 are connected between the conveyor belt 14.

[0047] The first servo motor 13 is controlled by a PLC. The first servo motor 13 drives the rear roller 136 to rotate counterclockwise, thereby causing the conveyor belt 14 to rotate 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 changes 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.

[0048] like Figure 2 As shown, a scraper 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 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;

[0049] The hot air ejected through the ejection slot 181 is ejected toward the outer surface of the conveyor belt 14 through the air vent 142 , and when the hot air contacts the plastic on the scraper plate 141 , the plastic is quickly dried.

[0050] The L-shaped trough frame 8 is further provided with a heating box 18 distributed at equal intervals above and below, and the heating box 18 is located inside the vertical portion of the conveyor belt 14;

[0051] like Figure 4-6 As shown, the heating box body 18 is inserted into the slot of the L-shaped slot frame 8, and a limit plate 182 is provided at the end of the heating box body 18. The heating box body 18 forms two sets 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;

[0052] 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. Inclined surfaces 186 are provided at the upper and lower ends of the ejection slot 181, giving the ejection slot 181 a trumpet shape. This arrangement can increase the speed and force of the hot air ejected from the cavity 187 through the ejection slot 181, ensuring that the hot air can be ejected through the air vents 142 toward the outer surface of the conveyor belt 14 and then contact the plastic on the scraper plate 141.

[0053] The spiral heating wire 184 is powered by PLC control. After the spiral heating wire 184 is powered on, it quickly heats the air in the cavity 187. 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.

[0054] The bottom of the rear end of the L-shaped trough frame 8 is connected to the separation tank 16 by a connecting shell 12;

[0055] The rear side wall of 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 toggling action of the inclined block 21, the plastic will not be blocked, and then the plastic will fall to the first screen plate 20.

[0056] A first sieve plate 20 is provided on the rear side wall inside the separation tank 16, and a second sieve plate 15 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. The gas collecting nozzle 91 is located at a height between the first sieve plate 20 and the second sieve plate 15, and several groups of air nozzles 92 are also connected to the rear end of the gas collecting nozzle 91.

[0057] A discharge port 17 is provided at the rear of the separation tank 16 , and the discharge port 17 is located between the first sieve plate 20 and the second sieve plate 15 .

[0058] like Figure 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 discharge it through the discharge port 17 for recovery.

[0059] 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.

[0060] 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 shell 12;

[0061] like Figure 7 As shown, the first servo motor 13 is fixed to the outer wall of the horizontal portion 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 housing 11 and is connected to the second pulley and the driving gear 133. One end of the crushing roller 19 extends out of the connecting shell 12 and is connected to the third pulley 132. A second belt 131 is connected between the second pulley and the third pulley 132.

[0062] The air collecting fan 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 engaged with the driving gear 133.

[0063] The outer diameter of the second pulley is greater than the outer diameter of the third pulley 132. In this way, 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 the crushing roller 19 can quickly crush the plastic after it enters the connecting shell 12.

[0064] The diameter of the driving gear 133 is larger than the diameter of the driven gear 135. Thus, 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 made faster, so that the air collecting blades 134 form a negative pressure in the protective housing 11.

[0065] The protective housing 11 is fixed to the outer 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 blades 134 are located inside the protective housing 11. Such a protective housing 11 plays a protective role;

[0066] 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 to the protective shell 11 through the air outlet groove 82. After the air collecting fan blades 134 rotate at 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 is discharged through the first pipe 10.

[0067] The protective shell 11 is respectively communicated with the heating box 18 , the aeration pipe 41 in the cleaning and separation tank 1 , and the gas collection nozzle 91 inside the separation tank 16 .

[0068] The lower side of the protective shell 11 is connected to the gas collecting box 7 through the first pipe 10. The gas collecting box 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.

[0069] 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;

[0070] The rear side of the lower portion of the gas collecting box body 7 is connected to the gas collecting nozzle 91 inside the separation tank 16 through the fourth pipe 9 .

[0071] After the air collecting blades 134 rotate at high speed to form a negative pressure in the protective housing 11, the outside air quickly enters the air collecting blades 134 through the air inlet groove 81 and the air outlet groove 82, and is then discharged into the air collecting box body 7 through the first pipe 10;

[0072] At this time, a portion of the air enters the cavity 187 through the second duct 71 and the opening 183 , and the hot air in the cavity 187 is ejected through the ejection slot 181 ;

[0073] A portion of the air enters the air collecting nozzle 91 through the fourth pipe 9 and is finally ejected through the air nozzle 92, blowing up the light dust in the plastic and then discharging it through the discharge port 17 for recovery;

[0074] The last part of the air is introduced into the clean water in the cleaning and separation tank 1 through the third pipe 4 and the aeration pipe 41. 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 so that the plastic can float on the surface of the clean water after cleaning.

[0075] Specifically, during use, the cleaning phase involves placing the preliminarily crushed plastic into a cleaning and separation tank 1 containing clean water. The high-speed rotation of the air-collecting blades 134 creates a negative pressure within the protective housing 11. External air enters the air-collecting blades 134 through the air inlet slots 81 and the air outlet slots 82, then enters the air-collecting box 7 through the first pipe 10. A portion of the air is then introduced into the clean water through the third pipe 4 and the aeration pipe 41. This air aerates the clean water to prevent odor and, at the same time, impinges on dust or dirt on the plastic surface, causing the cleaned plastic to float on the surface of the clean water.

[0076] Conveying stage: The second servo motor 2 drives the rear feed roller 6 to rotate clockwise, which in turn drives the front feed roller 6 to rotate clockwise via the first belt 5. The paddle on the feed roller 6 paddles 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, causing the conveyor belt 14 to rotate counterclockwise. The scraper 141 on the conveyor belt 14 conveys the plastic to the connecting shell 12.

[0077] Drying stage: The spiral heating wire 184 in the heating box 18 within the L-shaped slot frame 8 is energized, rapidly heating the air within the cavity 187. A portion of the air drawn in by the air collecting blades 134 enters the cavity 187 through the second duct 71 and opening 183. The hot air is ejected through the ejection slot 181. The hot air then passes through the air holes 142 on the surface of the conveyor belt 14 and contacts the plastic on the scraper 141, rapidly drying the plastic.

[0078] Crushing stage: The first servo motor 13 drives the rear roller 136 to rotate, which in turn drives the crushing roller 19 via the second pulley, the second belt 131, and the third pulley 132, rapidly crushing the plastic delivered to the connecting shell 12. The crushed plastic falls onto the inclined blocks 21, which are staggered in an upper and lower arrangement. The obstruction of the inclined blocks 21 prevents the plastic from becoming blocked and falls onto the first sieve plate 20.

[0079] 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 fan 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.

[0080] Efficient cleaning and conveying: Aeration cleans plastics, effectively removing dust and dirt from the surface while preventing the water from developing odors due to lack of oxygen. The combination of the feed assembly and conveyor belt assembly ensures efficient conveying of plastics from the cleaning tank to subsequent processing.

[0081] Rapid drying: The air vents 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.

[0082] Crushing: The crushing roller 19 rotates at high speed to achieve rapid crushing of the plastic.

[0083] Multi-stage separation: The cooperation of the first sieve plate 20, the second sieve plate 15 and the air nozzle 92 realizes the effective separation of light dust and heavy plastics, thereby improving the recycling quality.

[0084] 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.

[0085] Multi-stage separation:

[0086] Cleaning and Separation: The clean water in the cleaning and separation tank 1 separates the initially crushed plastics. Clean or lightweight plastics float on the surface of the water, while dirty or bulky plastics settle below, achieving a preliminary separation of the materials. Simultaneously, the paddles of the material shifting assembly effectively remove dust and dirt from the plastics' surfaces as they shift the floating plastics, further enhancing the separation efficiency and providing purer materials for subsequent processing.

[0087] Crushing and separation: The first servo motor 13 drives the crushing roller 19 to quickly crush the plastic transported to the connecting shell 15, and the plastic falls smoothly to the first screen plate 20 in the separation tank 16 to prepare for subsequent screening and separation.

[0088] Screening and separation: Inside the separation tank 16, a first sieve plate 20 and a second sieve plate 15 are installed, each inclined vertically. Light dust particles in the plastic are filtered by the first sieve plate 20 and fall through the sieve holes. The heavier particles flow along the bottom of the front end of the first sieve plate 20 to the second sieve plate 15, and finally fall into the separation tank 16 for storage. This effectively separates light dust from heavy plastic particles, improving the quality of recycled plastics. This multi-stage separation method, which gradually processes plastics from cleaning and crushing to screening, improves separation accuracy and efficiency, allowing materials with different characteristics to be effectively distinguished and processed.

[0089] Dust recovery:

[0090] Active collection: The first servo motor 13 drives the air collection blades 134 to rotate at high speed, creating a negative pressure within the protective housing 11. External air rapidly enters the protective housing 11 through the air inlet slot 81 and the air outlet slot 82, and is then discharged into the air collection box 7 through the first pipe 10. The air collection box 7 is connected to the heating box 18, the aeration pipe 41 in the cleaning and separation tank 1, and the air collection nozzle 91 inside the separation tank 16, allowing air to circulate within the device, providing power support for dust recovery.

[0091] 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.

[0092] Recycling: Throughout the entire process, air is not only used to recover dust but also aerates the clean water in the cleaning and separation tank 1, preventing it from becoming oxygen-deficient and stinking. It also removes dust or dirt from the plastic surface at the bottom of the clean water, aiding in cleaning the plastic. Simultaneously, the air participates in the hot air circulation in the heating box 18, rapidly drying the plastic. This air recycling improves energy efficiency, reduces operating costs, and makes the dust recovery process more environmentally friendly and efficient.

[0093] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the 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 by: 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; The upper rear part of the cleaning and separation tank is provided with an L-shaped slot frame for installing the conveyor belt, and the L-shaped slot frame is further provided with heating boxes distributed at equal intervals above and below, and the heating boxes are 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 connected to the heating box body, the aeration pipe in the cleaning and separation tank, and the gas collection nozzle inside the separation tank; 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; The outer side of the conveyor belt is provided with a scraper, and the surface of the conveyor belt is evenly distributed with air holes; The first servo motor is fixed to the outer side wall of the horizontal portion 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 housing and is connected to the second pulley and the driving gear, one end of the crushing roller extends out of the connecting housing and is 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 portion of the L-shaped slot frame by a rotating shaft, and a driven gear is fixed to the rotating shaft, and the driven gear is meshed with the driving gear; 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 provided at the upper end of the horizontal portion of the L-shaped slot frame, and an air outlet groove is provided at the side of the horizontal portion of the L-shaped slot frame, and the air inlet groove is connected to the protective shell through the air outlet groove; 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 sets of front and rear cavities through the partition in the middle, and spiral heating wires are provided at the upper and lower parts of the cavities; An ejection slot is provided on the outside of the cavity, and the ejection slot is located in the middle of the front and rear side walls of the heating box body. The upper and lower ends of the ejection slot are provided with inclined surfaces, so that the ejection slot is trumpet-shaped; 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 portion of the gas collecting box body is connected to the gas collecting nozzle inside the separation tank through a fourth pipe; 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, and 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 collection nozzle is located at a height between the first sieve plate and the second sieve plate, and the rear end of the air collection nozzle is also connected to several groups of air nozzles.

2. The multi-stage separation plastic crushing and dust recovery device according to claim 1, characterized in that: The material dispensing assembly includes two sets of front and rear material dispensing rollers fixed on the cleaning and separation tank by a vertical plate. One set 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 sets of first pulleys.

3. The multi-stage separation plastic crushing and dust recovery device according to claim 1, 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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