Plastic bottle label removing device based on multistage winnowing and sorting method

By adopting multi-stage air selection technology and centrifugal conveying units in the plastic bottle recycling equipment, the problem of scratches during the size grading and de-labeling of plastic bottles in the prior art is solved, and efficient and scratch-free plastic bottle recycling and treatment is achieved.

CN120116367APending Publication Date: 2025-06-10GUIZHOU ZHONGXINDA RENEWABLE RESOURCES CO LTD
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Patent Information

Application Number
CN202510459877.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-14
Publication Date
2025-06-10

AI Technical Summary

Technical Problem

The prior art cannot perform graded processing according to the size of the plastic bottle, and scratches on the surface of the bottle are easily caused during the de-stamping process.

Method used

A plastic bottle delabeling device based on multi-stage air selection is adopted, including a distribution silo and multiple air-drying delabeling lines. The size difference and label removal of the plastic bottle are distinguished by the centrifugal conveying unit and the delabeling unit, and the centrifugal conveying and surface drying of the plastic bottle is achieved through hot air flow and spiral blades.

Benefits of technology

Grading and efficient de-labeling are achieved according to the size of the plastic bottle, avoiding scratches on the bottle body, and improving recycling efficiency and product quality.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of waste recycling equipment, in particular to a plastic bottle label removing device based on multi-stage winnowing and a sorting method, and solves the problems that corresponding stage treatment cannot be performed according to the size of a plastic bottle and the surface of a bottle body is easily scratched in the label removing process when a waste plastic bottle is subjected to label removing in the prior art. Comprising a material distribution bin and a plurality of air-drying label-removing lines, a feeding conveyor is installed at the input end of the material distribution bin, the air-drying label-removing lines are installed at the output end of the material distribution bin, each air-drying label-removing line comprises a centrifugal label-removing mechanism, and each centrifugal label-removing mechanism is composed of a centrifugal conveying unit, two label-removing units and a grading exhaust unit. The centrifugal conveying unit comprises a conical air guiding base, and a flow dividing base is fixedly installed on one side of the conical air guiding base. Plastic bottles of different sizes are subjected to stage treatment, spiral conveying is performed during treatment, a centrifugal state is kept, and then efficient label removing and drying treatment can be achieved in the hot air injection process.
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Description

Technical Field

[0001] The present invention relates to the technical field of waste recycling equipment, and in particular to a plastic bottle label removal device and sorting method based on multi-stage air separation. Background Technique

[0002] As is well known, waste plastic bottles can be recycled and reused. An industrial chain for recycling waste plastic bottles can reflect the comprehensive situation of a society in aspects such as waste sorting, waste recycling, environmental protection laws and regulations, policy support, and public awareness. Only when the days of recycling and reusing enterprises get better can the foundation of a low-carbon society become stable. Currently, plastic bottle recycling factories mostly use modern production lines to clean, remove labels (peel off the plastic labels on the outer shell of plastic bottles), and crush waste plastic bottles, separating the bottle body, trademark skin, bottle cap, etc. of the plastic bottle, and sending the crushed bottle body back for further processing.

[0003] When removing labels from waste plastic bottles currently, it is not possible to perform corresponding grading according to the size of the plastic bottles, and the bottle body surface is easily scratched during the label removal process; therefore, it does not meet the existing requirements, and for this reason, we propose a plastic bottle label removal device and sorting method based on multi-stage air separation. Summary of the Invention

[0004] The purpose of the present invention is to provide a plastic bottle label removal device and sorting method based on multi-stage air separation to solve the problems raised in the above background technique that when removing labels from waste plastic bottles currently, it is not possible to perform corresponding grading according to the size of the plastic bottles, and the bottle body surface is easily scratched during the label removal process.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A plastic bottle label removal device based on multi-stage air separation, including a material distribution bin and multiple air-drying and label removal lines. An upper feeding conveyor is installed at the input end of the material distribution bin, and multiple air-drying and label removal lines are installed at the output end of the material distribution bin. The air-drying and label removal line includes a centrifugal label removal mechanism, and the centrifugal label removal mechanism is composed of a centrifugal conveying unit, two label removal units, and a grading and exhaust unit. The centrifugal conveying unit includes a conical air guide seat, a diversion seat is fixedly installed on one side of the conical air guide seat, an upward injection air vent is provided at the bottom end of the diversion seat, a centrifugal conveying cylinder is installed at the upper end of the conical air guide seat, a spiral blade is fixedly installed inside the centrifugal conveying cylinder, and a lateral blowing air vent is installed between the diversion seat and the centrifugal conveying cylinder;

[0006] The demarking unit includes a transmission mounting seat, a transmission motor is fixedly installed at the upper end of the transmission mounting seat, a plurality of blade mounting components are installed inside the transmission mounting seat, a transmission screw rod is installed inside the plurality of blade mounting components, the blade mounting component includes a transmission thread sleeve, a blade mounting plate is installed on one side of the transmission thread sleeve, a transmission connecting rod is installed between the transmission thread sleeve and the blade mounting plate, and a cutter head is installed at one end of the blade mounting plate.

[0007] Preferably, the air-drying demarking line further includes an input pipe connected to the bottom end of the centrifugal demarking mechanism, an output pipe is installed at the upper end of the centrifugal demarking mechanism, and a blanking conveyor is installed at one end of the output pipe.

[0008] Preferably, the centrifugal conveying unit further includes an air injection pipe fixedly connected to the upper end of the shunt seat, a conical conveying seat is fixedly installed inside the bottom end of the conical air guide seat, the centrifugal conveying cylinder is connected to the conical conveying seat through the conical air guide seat in a penetrating manner, the conical air guide seat, the centrifugal conveying cylinder and the conical conveying seat are coaxial, the shunt seat is connected to the conical air guide seat through an upper top air injection port in a penetrating manner, one end of the lateral air blowing port is inserted into the inside of the centrifugal conveying cylinder, the shunt seat is fixedly connected to the lateral air blowing port, and the inner diameters of the plurality of centrifugal conveying cylinders increase sequentially along the side of the material distribution bin.

[0009] Preferably, the grading exhaust unit includes a connecting frame, the connecting frame is fixedly connected to the centrifugal conveying cylinder, two air collecting shells are fixedly installed inside the connecting frame, a plurality of exhaust rods are fixedly installed inside each of the two air collecting shells, a plurality of exhaust holes are provided inside each exhaust rod, the plurality of exhaust rods are linearly arranged along the side of the air collecting shell, and the two air collecting shells are symmetrically installed relative to the centrifugal conveying cylinder.

[0010] Preferably, the input pipe and the output pipe are connected in a penetrating manner through the conical conveying seat and the centrifugal conveying cylinder, both ends of the input pipe are fixedly connected to the material distribution bin and the conical conveying seat, and both ends of the output pipe are fixedly connected to the centrifugal conveying cylinder and the blanking conveyor.

[0011] Preferably, the two demarking units are symmetrically installed relative to the centrifugal conveying cylinder, the output end of the transmission motor penetrates through the transmission mounting seat and is connected to the transmission screw rod through a coupling, the transmission screw rod is threadedly connected to a plurality of transmission thread sleeves, and the plurality of blade mounting components are linearly arranged along the axis of the transmission screw rod.

[0012] Preferably, both ends of the transmission connecting rod are rotatably connected to the transmission thread sleeve and the blade mounting plate through pin shafts, one end of the blade mounting plate penetrates through the transmission mounting seat and the centrifugal conveying cylinder and is fixedly connected to the cutter head, a plurality of soft teeth are fixedly provided on one side of the cutter head, and the blade mounting plate is slidably connected to both the transmission mounting seat and the centrifugal conveying cylinder.

[0013] A plastic bottle label removal and sorting method based on multi-stage air separation, comprising the following steps:

[0014] S1: Connect the power supply, input the plastic bottles to be processed into the inner side of the distribution bin through the feeding conveyor, and the distribution bin differentiates the plastic bottles according to their sizes and diverts them to the inner sides of multiple air-drying and label-removing lines. Among them, the plastic bottles are input into the inner side of the conical conveying seat through the input pipe, and hot air is injected through the injection air pipe, so that the injection air pipe is branched through the branch seat and is respectively conveyed to the inner sides of the conical air guide seat and the centrifugal conveying cylinder through the upper top injection air outlet and the lateral blowing air outlet;

[0015] S2: At this time, the hot air injected from the upper top injection air outlet flows linearly inside the centrifugal conveying cylinder and pushes the plastic bottles upward. At the same time, the lateral blowing air outlet inputs the hot air between the centrifugal conveying cylinder and the plastic bottles and spirally rises through the spiral blades. Furthermore, the plastic bottles can spirally move upward under the action of the hot air injected from the lateral blowing air outlet while moving upward, keeping the plastic bottles in a centrifugal state during transportation;

[0016] S3: The two collecting shells are symmetrically installed relative to the centrifugal conveying cylinder, and a plurality of linearly arranged exhaust rods are fixedly installed inside each collecting shell. Furthermore, the collecting shell can discharge the hot air through the exhaust holes provided on the exhaust rods, facilitating the centrifugal drying operation of the surface of the plastic bottles. The two collecting shells are convenient for collecting and recycling the hot air, reducing heat waste;

[0017] S4: The inner diameters of the multiple spiral blades increase in sequence, so that the spiral blades in the multiple centrifugal conveying units can meet the synchronous transportation of plastic bottles of different sizes. Debranding units are installed on both sides of the centrifugal conveying cylinder. Among them, a plurality of blade mounting assemblies are linearly arranged, and a plurality of soft teeth are provided on one side of the tool heads. While the plastic bottles spiral upward, the labels on the surface of the plastic bottles can be scraped and peeled off by the multiple tool heads;

[0018] S5: The transmission thread sleeve is threadedly connected to the transmission screw rod. Start the transmission motor, so that the transmission motor drives a plurality of transmission thread sleeves to move synchronously through the transmission screw rod under the support of the transmission mounting seat. Furthermore, the transmission thread sleeve drives the blade mounting plate to linearly slide relative to the transmission mounting seat and the centrifugal conveying cylinder through the transmission connecting rod and pushes the tool head to adjust the position, realizing the adjustment of the contact tightness between the soft teeth and the surface of the plastic bottles. Furthermore, it is convenient to control the debranding effect while meeting the debranding operation of plastic bottles of different sizes. After the plastic bottles are processed, they are output through the output pipe and are classified and conveyed through the individual blanking conveyors, facilitating the processing and classification of plastic bottles of different sizes.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In the present invention, the hot air injected through the upper top injection air outlet flows linearly inside the centrifugal conveying cylinder and pushes up the plastic bottle. At the same time, the lateral blowing air outlet inputs hot air between the centrifugal conveying cylinder and the plastic bottle and makes it spiral upward through the spiral blades. Thus, while the plastic bottle moves upward, it can spiral upward under the action of the hot air injected through the lateral blowing air outlet, keeping the plastic bottle in a centrifugal state during transportation. The heat collecting shell can discharge the hot air through the exhaust holes provided on the exhaust rod, facilitating the centrifugal drying operation on the surface of the plastic bottle. The two heat collecting shells are convenient for collecting and recycling the hot air, reducing heat waste. The hot air is output through the output pipe and is hierarchically conveyed to each blanking conveyor, facilitating the processing and grading of plastic bottles of different sizes.

[0021] 2. In the present invention, the inner diameters of multiple spiral blades increase sequentially, enabling the spiral blades in multiple centrifugal conveying units to meet the synchronous transportation of plastic bottles of different sizes. Multiple soft teeth are provided on one side of the cutter head. While the plastic bottle spirals upward, the surface label of the heated plastic bottle can be efficiently scraped and peeled off by multiple cutter heads. The driving motor synchronously drives multiple driving threaded sleeves to move through the driving screw rod. Then, the driving threaded sleeve drives the blade mounting plate to linearly slide relative to the driving mounting seat and the centrifugal conveying cylinder through the driving connecting rod and pushes the cutter head to adjust its position, realizing the adjustment of the contact tightness between the soft teeth and the surface of the plastic bottle, and thus facilitating the control of the label removal effect while meeting the label removal operation for plastic bottles of different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0023] Figure 2 is a rear view of the whole of the present invention;

[0024] Figure 3 is a schematic structural diagram of the centrifugal label removing mechanism of the present invention;

[0025] Figure 4 is a sectional structural diagram of the centrifugal label removing mechanism of the present invention;

[0026] Figure 5 is a sectional structural diagram of the centrifugal conveying unit of the present invention;

[0027] Figure 6 For the present invention Figure 5 is an enlarged structural diagram of area A in;

[0028] Figure 7 is a sectional structural diagram of the label removing unit of the present invention;

[0029] Figure 8 For the present invention Figure 7 is an enlarged structural diagram of area B in.

[0030] In the figure: 1. Loading conveyor; 2. Material distribution bin; 3. Air-drying and label-removing line; 301. Input pipe; 302. Output pipe; 303. Downfeeding conveyor; 4. Centrifugal label-removing mechanism; 5. Centrifugal conveying unit; 501. Conical air guide seat; 502. Centrifugal conveying cylinder; 503. Shunt seat; 504. Injection air pipe; 505. Spiral blade; 506. Conical conveying seat; 507. Side blowing air outlet; 508. Upward injection air outlet; 6. Label-removing unit; 601. Driving mounting seat; 602. Driving motor; 603. Driving screw rod; 604. Blade mounting assembly; 605. Driving thread sleeve; 606. Driving connecting rod; 607. Blade mounting plate; 608. Tool bit; 7. Classification and exhaust unit; 701. Connecting frame; 702. Flow-accumulating shell; 703. Exhaust rod; 704. Exhaust hole. Specific implementation mode

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0032] The driving motor 602 (model: GV50-3.7KW-60-S) mentioned in the present invention can be obtained by purchasing from the market or customizing privately.

[0033] Please refer to Figure 1 and Figure 2 , an embodiment provided by the present invention: A plastic bottle label-removing device based on multi-stage air separation, including a material distribution bin 2 and multiple air-drying and label-removing lines 3. The input end of the material distribution bin 2 is installed with a loading conveyor 1, and the output end of the material distribution bin 2 is installed with multiple air-drying and label-removing lines 3. The air-drying and label-removing line 3 includes a centrifugal label-removing mechanism 4. The bottom end of the centrifugal label-removing mechanism 4 is installed with an input pipe 301, the upper end of the centrifugal label-removing mechanism 4 is installed with an output pipe 302, and one end of the output pipe 302 is installed with a downfeeding conveyor 303. The material distribution bin 2 differentiates and shunts plastic bottles according to the size of the plastic bottles to the inside of multiple air-drying and label-removing lines 3.

[0034] Please refer to Figures 3 to 6, the centrifugal label removing mechanism 4 is composed of a centrifugal conveying unit 5, two label removing units 6 and a grading and exhaust unit 7. The centrifugal conveying unit 5 includes a conical air guiding seat 501. One side of the conical air guiding seat 501 is fixedly installed with a shunt seat 503. The bottom end of the shunt seat 503 is provided with an upward injection air inlet 508. The shunt seat 503 and the conical air guiding seat 501 are connected through the upward injection air inlet 508. The upper end of the conical air guiding seat 501 is installed with a centrifugal conveying cylinder 502. Both ends of the output pipe 302 are fixedly connected with the centrifugal conveying cylinder 502 and the blanking conveyor 303. A spiral blade 505 is fixedly installed inside the centrifugal conveying cylinder 502. The hot air injected through the upward injection air inlet 508 flows linearly inside the centrifugal conveying cylinder 502 and stably pushes up the plastic bottles.

[0035] A lateral air blowing port 507 is installed between the shunt seat 503 and the centrifugal conveying cylinder 502. The upper end of the shunt seat 503 is fixedly installed with an air injection pipe 504. The inner side of the bottom end of the conical air guiding seat 501 is fixedly installed with a conical conveying seat 506. The input pipe 301 and the output pipe 302 are connected through the conical conveying seat 506 and the centrifugal conveying cylinder 502. The centrifugal conveying cylinder 502 and the conical conveying seat 506 are connected through the conical air guiding seat 501. Both ends of the input pipe 301 are fixedly connected with the distribution bin 2 and the conical conveying seat 506. The conical air guiding seat 501, the centrifugal conveying cylinder 502 and the conical conveying seat 506 are coaxial. One end of the lateral air blowing port 507 is inserted into the inside of the centrifugal conveying cylinder 502. The shunt seat 503 is fixedly connected with the lateral air blowing port 507. The inner diameter sizes of multiple centrifugal conveying cylinders 502 increase sequentially along the side of the distribution bin 2. The lateral air blowing port 507 inputs hot air between the centrifugal conveying cylinder 502 and the plastic bottles and spirally rises through the spiral blade 505. Thus, the plastic bottles can spirally move upward under the action of the hot air injected through the lateral air blowing port 507 while moving upward, keeping the plastic bottles in a centrifugal state during transportation.

[0036] Please refer to Figure 4 and Figure 7 , the two label removing units 6 are symmetrically installed relative to the centrifugal conveying cylinder 502. The label removing unit 6 includes a transmission mounting seat 601. The upper end of the transmission mounting seat 601 is fixedly installed with a transmission motor 602. Multiple blade mounting assemblies 604 are installed inside the transmission mounting seat 601. A transmission screw 603 is installed inside multiple blade mounting assemblies 604. Multiple blade mounting assemblies 604 are linearly arranged along the axis of the transmission screw 603. The output end of the transmission motor 602 penetrates through the transmission mounting seat 601 and is connected with the transmission screw 603 through a coupling, so that the transmission motor 602 synchronously drives multiple blade mounting assemblies 604 to act through the transmission screw 603.

[0037] Please refer to Figure 7 and Figure 8, the blade mounting assembly 604 includes a transmission thread sleeve 605. The transmission screw 603 is threadedly connected to a plurality of transmission thread sleeves 605. One side of the transmission thread sleeve 605 is provided with a blade mounting plate 607. The blade mounting plate 607 is slidably connected to both the transmission mounting seat 601 and the centrifugal conveying cylinder 502. A transmission connecting rod 606 is installed between the transmission thread sleeve 605 and the blade mounting plate 607. Both ends of the transmission connecting rod 606 are rotatably connected to the transmission thread sleeve 605 and the blade mounting plate 607 through pin shafts. One end of the blade mounting plate 607 is provided with a cutter head 608. One end of the blade mounting plate 607 penetrates through the transmission mounting seat 601 and the centrifugal conveying cylinder 502 and is fixedly connected to the cutter head 608. A plurality of soft teeth are fixedly provided on one side of the cutter head 608. By adjusting the position of the pushing cutter head 608, the contact tightness between the soft teeth and the surface of the plastic bottle is adjusted, thereby facilitating the control of the label removal effect while meeting the label removal operation requirements for plastic bottles of different sizes.

[0038] Please refer to Figure 3 , Figure 4 and Figure 8 , the grading exhaust unit 7 includes a connecting frame 701. The connecting frame 701 is fixedly connected to the centrifugal conveying cylinder 502. Two air collecting shells 702 are fixedly installed inside the connecting frame 701. A plurality of exhaust rods 703 are fixedly installed inside each of the two air collecting shells 702. A plurality of exhaust holes 704 are provided inside each exhaust rod 703. The plurality of exhaust rods 703 are linearly arranged along the side of the air collecting shell 702. The two air collecting shells 702 are symmetrically installed relative to the centrifugal conveying cylinder 502. The air collecting shell 702 can discharge hot air through the exhaust holes 704 provided on the exhaust rod 703, facilitating the centrifugal drying operation of the surface of the plastic bottle.

[0039] A plastic bottle label removal and sorting method based on multi-stage air separation includes the following steps:

[0040] S1: Turn on the power supply, input the plastic bottles to be processed into the inside of the distribution bin 2 through the feeding conveyor 1. The distribution bin 2 differentiates the plastic bottles according to their sizes and diverts them into the inside of a plurality of air-drying and label-removing lines 3. Among them, the plastic bottles are input into the inside of the conical conveying seat 506 through the input pipe 301, and hot air is injected through the injection pipe 504, so that the injection pipe 504 is branched through the distribution seat 503 and is respectively conveyed to the inside of the conical air guide seat 501 and the centrifugal conveying cylinder 502 through the upper top air injection port 508 and the lateral air blowing port 507;

[0041] S2: At this time, the hot air injected from the upper top injection air outlet 508 flows linearly inside the centrifugal conveying cylinder 502 and pushes up the plastic bottle. At the same time, the lateral blowing air outlet 507 inputs hot air between the centrifugal conveying cylinder 502 and the plastic bottle and spirally ascends through the spiral blades 505. Then, while the plastic bottle moves upward, it can spirally move upward under the action of the hot air injected from the lateral blowing air outlet 507, keeping the plastic bottle in a centrifugal state during transportation;

[0042] S3: The two collecting shells 702 are symmetrically installed relative to the centrifugal conveying cylinder 502, and a plurality of linearly arranged exhaust rods 703 are fixedly installed inside each collecting shell 702. Then, the collecting shell 702 can discharge the hot air through the exhaust holes 704 provided on the exhaust rods 703, facilitating the centrifugal drying operation on the surface of the plastic bottle. The two collecting shells 702 are convenient for collecting and recycling the hot air, reducing heat waste;

[0043] S4: The inner diameters of the plurality of spiral blades 505 increase in sequence, enabling the spiral blades 505 in the plurality of centrifugal conveying units 5 to satisfy the synchronous transportation of plastic bottles of different sizes. Demarking units 6 are installed on both sides of the centrifugal conveying cylinder 502, among which a plurality of blade mounting assemblies 604 are linearly arranged, and a plurality of soft teeth are provided on one side of the tool tips 608. While the plastic bottle spirally ascends, the tool tips 608 can scrape and peel the labels on the surface of the plastic bottle;

[0044] S5: The transmission screw sleeve 605 is threadedly connected to the transmission screw 603. Start the transmission motor 602, so that the transmission motor 602 drives a plurality of transmission screw sleeves 605 to move synchronously through the transmission screw 603 under the support of the transmission mounting seat 601. Then, the transmission screw sleeve 605 drives the blade mounting plate 607 to linearly slide relative to the transmission mounting seat 601 and the centrifugal conveying cylinder 502 through the transmission connecting rod 606 and pushes the tool tip 608 to adjust its position, realizing the adjustment of the contact tightness between the soft teeth and the surface of the plastic bottle. Thus, it is convenient to satisfy the demarking operation for plastic bottles of different sizes and control the demarking effect at the same time. After the plastic bottle is processed, it is output through the output pipe 302 and is classified and conveyed by the plurality of blanking conveyors 303, facilitating the processing and classification of plastic bottles of different sizes.

[0045] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A plastic bottle label removal device based on multi-stage air selection, comprising a material distribution bin (2) and a plurality of air drying and label removal circuits (3), characterized in that: The input end of the material distribution bin (2) is provided with a loading conveyor (1), and the output end of the material distribution bin (2) is provided with a plurality of air-drying and label removal lines (3), the air-drying and label removal lines (3) comprising a centrifugal label removal mechanism (4), the centrifugal label removal mechanism (4) comprising a centrifugal conveying unit (5), two label removal units (6) and a graded exhaust unit (7), the centrifugal conveying unit (5) comprising a conical air guide seat (501), a diverter seat (503) being fixedly mounted on one side of the conical air guide seat (501), an upper top air injection port (508) being provided at the bottom end of the diverter seat (503), a centrifugal conveying cylinder (502) being fixedly mounted on the inner side of the centrifugal conveying cylinder (502), and a lateral air blowing port (507) being installed between the diverter seat (503) and the centrifugal conveying cylinder (502); The label removal unit (6) comprises a transmission mounting seat (601), a transmission motor (602) is fixedly mounted on the upper end of the transmission mounting seat (601), a plurality of blade mounting assemblies (604) are mounted on the inner side of the transmission mounting seat (601), a transmission screw (603) is mounted on the inner side of the plurality of blade mounting assemblies (604), the blade mounting assembly (604) comprises a transmission threaded sleeve (605), a blade mounting plate (607) is mounted on one side of the transmission threaded sleeve (605), a transmission connecting rod (606) is mounted between the transmission threaded sleeve (605) and the blade mounting plate (607), and a cutter head (608) is mounted on one end of the blade mounting plate (607).

2. A plastic bottle label removal device based on multi-stage air separation according to claim 1, characterized in that: The air-drying label removal circuit (3) further comprises an input pipe (301) connected to the bottom end of the centrifugal label removal mechanism (4); an output pipe (302) is installed at the upper end of the centrifugal label removal mechanism (4); and a material discharge conveyor (303) is installed at one end of the output pipe (302).

3. The device for removing labels from plastic bottles based on multi-stage air separation according to claim 2 is characterized in that: The centrifugal conveying unit (5) also includes an air injection pipe (504) fixedly connected to the upper end of the diverter seat (503); a conical conveying seat (506) is fixedly installed on the inner side of the bottom end of the conical air guide seat (501); the centrifugal conveying cylinder (502) and the conical conveying seat (506) are connected through the conical air guide seat (501); the conical air guide seat (501), the centrifugal conveying cylinder (502) and the conical conveying seat (506) are coaxial; the diverter seat (503) and the conical air guide seat (501) are connected through the upper top air injection port (508); one end of the side blowing port (507) is plugged into the inner side of the centrifugal conveying cylinder (502); the diverter seat (503) and the side blowing port (507) are fixedly connected; the inner diameter size of the plurality of centrifugal conveying cylinders (502) increases in sequence along the side of the material distribution bin (2).

4. The device for removing labels from plastic bottles based on multi-stage air separation according to claim 3 is characterized in that: The graded exhaust unit (7) comprises a connecting frame (701), wherein the connecting frame (701) is fixedly connected to the centrifugal conveying cylinder (502), and two collecting shells (702) are fixedly installed on the inner side of the connecting frame (701), and a plurality of exhaust rods (703) are fixedly installed on the inner side of the two collecting shells (702), and a plurality of exhaust holes (704) are provided on the inner side of each of the exhaust rods (703), and the plurality of exhaust rods (703) are linearly arranged along the side of the collecting shell (702), and the two collecting shells (702) are symmetrically installed relative to the centrifugal conveying cylinder (502).

5. The device for removing labels from plastic bottles based on multi-stage air separation according to claim 4 is characterized in that: The input pipe (301) and the output pipe (302) are connected through a conical conveying seat (506) and a centrifugal conveying cylinder (502); both ends of the input pipe (301) are fixedly connected to the material distribution bin (2) and the conical conveying seat (506); and both ends of the output pipe (302) are fixedly connected to the centrifugal conveying cylinder (502) and the unloading conveyor (303).

6. The device for removing labels from plastic bottles based on multi-stage air separation according to claim 5 is characterized in that: The two label removal units (6) are symmetrically mounted relative to the centrifugal conveying cylinder (502); the output end of the transmission motor (602) passes through the transmission mounting seat (601) and is connected to the transmission screw (603) via a coupling; the transmission screw (603) is threadedly connected to a plurality of transmission threaded sleeves (605); and the plurality of blade mounting assemblies (604) are linearly arranged along the axis of the transmission screw (603).

7. The device for removing labels from plastic bottles based on multi-stage air separation according to claim 6 is characterized in that: Both ends of the transmission connecting rod (606) are rotatably connected to the transmission threaded sleeve (605) and the blade mounting plate (607) through pins; one end of the blade mounting plate (607) passes through the transmission mounting seat (601) and the centrifugal conveying cylinder (502) and is fixedly connected to the cutter head (608); a plurality of soft teeth are fixedly provided on one side of the cutter head (608); and the blade mounting plate (607) is slidably connected to the transmission mounting seat (601) and the centrifugal conveying cylinder (502).

8. A method for removing labels and sorting plastic bottles based on multi-stage air separation, characterized in that: The following steps are involved: S1: Turn on the power supply, input the plastic bottles to be processed into the inner side of the distribution bin (2) through the feeding conveyor (1), and distinguish the plastic bottles according to their sizes through the distribution bin (2) and divert them to the inner side of multiple air-drying and label removal lines (3), wherein the plastic bottles are input into the inner side of the conical conveying seat (506) through the input pipe (301), and hot air is injected through the air injection pipe (504), so that the air injection pipe (504) diverts through the diversion seat (503) and transports them to the inner side of the conical air guide seat (501) and the centrifugal conveying cylinder (502) respectively through the upper air injection port (508) and the side air blowing port (507); S2: At this time, the hot air injected by the upper air injection port (508) flows linearly inside the centrifugal conveying cylinder (502) and pushes up the plastic bottle. At the same time, the lateral air blowing port (507) inputs the hot air between the centrifugal conveying cylinder (502) and the plastic bottle and ascends in a spiral shape through the spiral blade (505). As a result, the plastic bottle can move upward in a spiral shape under the action of the hot air injected by the lateral air blowing port (507), thereby keeping the plastic bottle in a centrifugal state during transportation. S3: The two collecting shells (702) are symmetrically installed relative to the centrifugal conveying cylinder (502), and a plurality of linearly arranged exhaust rods (703) are fixedly installed on the inner side of each collecting shell (702), so that the collecting shell (702) can discharge hot air through the exhaust holes (704) provided on the exhaust rods (703), which is convenient for centrifugal drying of the surface of the plastic bottle. The two collecting shells (702) facilitate the collection and reflux of hot air, thereby reducing heat waste; S4: The inner diameters of the plurality of spiral blades (505) are increased in sequence, so that the spiral blades (505) in the plurality of centrifugal conveying units (5) can meet the requirements of synchronous conveying of plastic bottles of different sizes. Label removal units (6) are installed on both sides of the centrifugal conveying cylinder (502), wherein the plurality of blade mounting assemblies (604) are arranged linearly, and a plurality of soft teeth are provided on one side of the cutter head (608). The labels on the surface of the plastic bottles can be scraped and peeled off by the plurality of cutter heads (608) while the plastic bottles are spirally ascending; S5: The transmission threaded sleeve (605) is threadedly connected to the transmission screw (603), and the transmission motor (602) is started, so that the transmission motor (602) drives the plurality of transmission threaded sleeves (605) to move synchronously through the transmission screw (603) under the support of the transmission mounting seat (601), and then the transmission threaded sleeve (605) drives the blade mounting plate (607) to slide linearly relative to the transmission mounting seat (601) and the centrifugal conveying cylinder (502) through the transmission connecting rod (606) and pushes the blade head (608) to adjust the position, so as to adjust the contact tightness between the soft teeth and the surface of the plastic bottle, so as to facilitate the removal of labels for plastic bottles of different sizes and control the removal effect. After the plastic bottles are processed, they are output through the output pipe (302) and graded and conveyed through the unloading conveyor (303), so as to facilitate the processing and grading of plastic bottles of different sizes.