A device and method for identifying and classifying waste plastic bottles

Abstract

The application discloses a kind of identification classification devices of waste plastic bottles, including the identification classification conveying line for conveying waste plastic bottles and being set on identification classification conveying line line scanning infrared camera, line scanning camera, highlight infrared light source, highlight light source;The highlight infrared light source is irradiated through the waste plastic bottle, cooperates the line scanning infrared camera and takes the waste plastic bottle, to detect whether there is rubbish in waste plastic bottle;The highlight light source illuminates the waste plastic bottle, cooperates the line scanning camera and takes waste plastic bottle, to identify the final classification of waste plastic bottle.The application further discloses a kind of identification classification method of waste plastic bottle.The beneficial effect of the application is to better identify and classify waste plastic bottles.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of identification classification device and identification classification method of waste plastic bottle, mainly applied in the technical field of identification classification and sorting recycling of waste plastic bottle. BACKGROUND

[0002] With the continuous strengthening of garbage classification and environmental protection consciousness, the governments of various countries vigorously introduce policies and regulations related to garbage classification and resource recycling, prompting major international and domestic brands with social influence to join the ranks of advocating the use or partial use of recycled materials to replace virgin materials to produce product packaging. Because brand owners control the quality of their own product safety, hygiene and other aspects, they also strictly refer to the quality standards of virgin raw materials in the selection and use of recycled materials. Due to historical, market, on-site management, raw material characteristics and technical reasons, the original traditional plastic bottle recycling industry is mostly designed with the idea of reducing costs. Practitioners and enterprises are mostly individuals, individual businesses and small and micro enterprises. They mostly use weighbridges to simply physically weigh incoming materials, manually rely on experience to simply classify and account for the material quality and color of plastic bottle recycling, and use simple mechanical conveying and compression equipment for classification, compression and packaging operations. Therefore, the following problems exist:

[0003] Lack of unified recycling standards, many transaction disputes;

[0004] Because the recycled plastic bottles themselves have residues and carry a large amount of debris during the recycling process, the diversity and complexity of packaging materials make it difficult to determine prices and cause many disputes due to the lack of unified standards and reasonable inspection methods;

[0005] Low degree of automation, large operation site, high labor and transportation and storage costs, chaotic on-site, high safety and environmental protection pressure;

[0006] Plastic bottle recycling has many varieties, complex materials, large size, plastic, and light weight (about 40,000 beverage bottles per ton). Currently, most rely on semi-mechanized conveyor belts, packaging machines and other equipment for manual packaging operations, resulting in large operation yards and increasing transportation and handling costs. Because of this, the operation site is chaotic, and the odors and equipment noise caused by the garbage and residues they carry themselves pose a major safety and environmental hazard to workers.

[0007] Precise classification is difficult, quality is not guaranteed, sorting cost is high, and recycling added value is low;

[0008] Due to the lack of automatic classification and sorting equipment for original bottles (not crushed), most of them use skilled workers to sort by experience. Due to the complexity of recycling plastic bottles and the instability of manual sorting, it causes serious quality problems and hinders the development of high-quality utilization of downstream production enterprises. The industrialized beverage bottle recycling spectrum automatic sorting machine currently appearing on the market can only adapt to the color and material sorting of plastic bottles after crushing and removing labels, and cannot identify and sort the recycled plastic bottles of the same material, different brands and different aging degrees.

[0009] Due to the traditional production mode of plastic bottle recycling, it is difficult to effectively inventory the on-site goods. SUMMARY

[0010] The technical problem to be solved by the present application is to provide an identification and classification device and method for waste plastic bottles, which can better identify and classify waste plastic bottles and improve the rationality and efficiency of subsequent sorting.

[0011] The present application is realized by the following technical solutions.

[0012] An identification and classification device for waste plastic bottles, comprising an identification and classification conveying line for conveying waste plastic bottles, and an infrared detection camera, an identification camera, a high-brightness infrared light source and a high-brightness light source arranged on the identification and classification conveying line; the high-brightness infrared light source penetrates and irradiates the passing waste plastic bottles, cooperates with the infrared detection camera to take pictures of the passing waste plastic bottles, and detects whether there are impurities in the waste plastic bottles; the high-brightness light source illuminates the passing waste plastic bottles, cooperates with the identification camera to take pictures of the waste plastic bottles, and identifies the final classification of the waste plastic bottles.

[0013] As a further improvement of the present application, the high-brightness infrared light source is arranged at the front end of the identification and classification conveying line and below the conveying surface of the identification and classification conveying line, for upwardly emitting infrared light source to penetrate and irradiate the waste plastic bottles; the infrared detection camera is arranged above the front end of the identification and classification conveying line, for downwardly taking pictures of the waste plastic bottles; the high-brightness light source is arranged above the middle or rear part of the identification and classification conveying line, for downwardly emitting light source to illuminate the waste plastic bottles; the identification camera is arranged above the middle or rear part of the identification and classification conveying line and above the high-brightness light source, for downwardly taking pictures of the waste plastic bottles.

[0014] As a further improvement of the present application, the identification and classification device for waste plastic bottles further comprises a rack, and the infrared detection camera, the identification camera and the high-brightness light source are all mounted on the rack.

[0015] As a further improvement of the present application, the two sides of the identification and classification conveying line are provided with protective fences, and at least one partition fence is arranged in the middle, so as to divide the identification and classification conveying line into a plurality of identification and classification conveying channels arranged side by side, and each identification and classification conveying channel is provided with a high-brightness infrared light source and a high-brightness light source.

[0016] As a further improvement of the present application, the protective fence and the partition fence extend from the front end to the middle of the identification and classification conveying line, and the two sides of the identification and classification conveying channel are provided with blocking strips from the middle to the rear end to connect the protective fence and the partition fence; the height of the blocking strip is lower than that of the protective fence and the partition fence.

[0017] As a further improvement of the present application, the identification and classification conveying channel is a chain plate conveyor.

[0018] A method for identifying and classifying waste plastic bottles, comprising the following steps:

[0019] S1: The high-brightness infrared light source irradiates the waste plastic bottle, the identification camera photographs the waste plastic bottle, and it is detected whether there is any impurity in the waste plastic bottle; if there is any impurity, the final classification is determined; if there is no impurity, S2 is performed;

[0020] S2: The high-brightness light source irradiates the waste plastic bottle, the identification camera photographs the waste plastic bottle, and the photographed picture is compared with the model in the model library in terms of appearance characteristics to determine the final classification of the waste plastic bottle.

[0021] As a further improvement of the present application, the establishment step of the model library in step S2 comprises:

[0022] S21: A list of different waste plastic bottles is established, the waste plastic bottles are classified, and the final classification is determined;

[0023] S22: A plurality of images of different angles and different damage degrees are collected for each kind of waste plastic bottle;

[0024] S23: The different images of each kind of waste plastic bottle are calibrated;

[0025] S24: The calibrated images of each kind of waste plastic bottle are self-learned to generate a model.

[0026] As a further improvement of the present application, the waste plastic bottles in step S21 are classified by at least three different attributes.

[0027] As a further improvement of the present application, the attributes include food grade or non-food grade, the type of liquid originally contained in the waste plastic bottle, the material of the waste plastic bottle, and the color of the waste plastic bottle.

[0028] The present application has the following advantages:

[0029] Based on infrared light transmission and image feature comparison, the waste plastic bottles are reasonably identified and classified, so as to facilitate subsequent sorting and recycling. BRIEF DESCRIPTION OF DRAWINGS

[0030] The preferred embodiments of the present application will be described in detail below with the help of the accompanying drawings, so as to help understand the purposes and advantages of the present application, in which:

[0031] Figure 1 A front view of a fine sorting and recycling assembly for waste plastic bottles;

[0032] Figure 2 A structural schematic view of a first climbing conveying line;

[0033] Figure 3 A structural schematic view of an abnormal specification collection line;

[0034] Figure 4 A structural schematic view of a second climbing conveying line;

[0035] Figure 5 A structural schematic view of a planar arrangement conveying line;

[0036] Figure 6 A top view of a planar arrangement conveying line;

[0037] Figure 7 A structural schematic view of an identification and classification device;

[0038] Figure 8 A structural schematic view of a sorting device;

[0039] Figure 9 A structural schematic view of a sorting and collecting line. DETAILED DESCRIPTION

[0040] The present application will be further described in detail below according to the drawings and embodiments.

[0041] In this specification, the orientation terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or possibly mentioned are defined with respect to the structure shown in the drawings, and the words "inner" and "outer" respectively refer to the direction towards or away from the geometric center of a particular component. They are relative concepts, so they may change accordingly according to their different positions, different use states. Therefore, these or other orientation terms should not be interpreted as restrictive terms.

[0042] REFERENCE Figures 1-9 A fine sorting and recycling assembly for waste plastic bottles, comprising, in order from front to back: an abnormal specification screening device 1, a multi-stage arrangement conveying device 2, an identification and classification device 3, and a sorting device 4.

[0043] The abnormal specification screening device 1 is used for inputting waste plastic bottles and screening out abnormal specification classes therein, mainly large specification daily chemical classes, such as laundry liquid bottles, large shampoo bottles, washing powder barrels and the like, which have width and thickness dimensions exceeding 10 cm except height.

[0044] The multi-stage arrangement conveying device 2 arranges the direction and interval of the waste plastic bottles screened out. The waste plastic bottles passing through the multi-stage arrangement conveying device 2 are adjusted to front-to-back direction and arranged into a queue with a certain interval.

[0045] The identification and classification device 3 detects and identifies the waste plastic bottles passing through in order, detects whether there are sundries (such as metal objects such as screws and nuts) in the waste plastic bottles, and identifies the specific model of the waste plastic bottles and finally classifies them.

[0046] The sorting device 4 sorts and recycles the waste plastic bottles classified after identification and classification according to their final classification.

[0047] The abnormal specification screening device 1 includes a first climbing conveying line 11, a screening conveying line 12, an abnormal specification collection line 13, and a screening mechanism arranged on the screening conveying line 12, wherein the first climbing conveying line 11 and the screening conveying line 12 are connected in front and back. The first climbing conveying line 11 is upwardly inclined from front to back, the screening conveying line 12 is arranged as a horizontal conveying line, and the height of the rear end of the first climbing conveying line 11 is higher than that of the screening conveying line 12. The waste plastic bottles are conveyed through the first climbing conveying line 11 and fall from the rear end thereof into the screening conveying line 12. The screening mechanism is used for capturing the abnormal specification classes in the waste plastic bottles and sending them into the abnormal specification conveying line.

[0048] The inclination of the first climbing conveying line 11 can make the stacked waste plastic bottles be shaken off so as to avoid being pressed by the waste plastic bottles below in the screening conveying line 12 and thus being missed by the screening mechanism and entering the multi-stage arrangement conveying device 2. While the first climbing conveying line 11 completes the input of the waste plastic bottles, the running speed thereof can be controlled to effectively control the unit quantity of the input, so as to adapt to the unit identification and sorting capacity of the production line.

[0049] The first climbing conveying line 11 can use roller conveyor, chain plate conveyor, belt conveyor, and considering avoiding the phenomenon of sliding of the qualified waste plastic bottles during conveying, the roller conveyor is preferably used. Moreover, through appropriate inclination angle setting, part of the abnormal specification class with diameter greater than 10 cm can slide off from the first climbing conveying line 11, which plays a pre-screening role and reduces the working pressure of the subsequent screening mechanism. In addition, a placing platform can be arranged at the front end of the first climbing conveying line 11, which is specially used for stacking the waste plastic bottles to wait for the conveying of the first climbing conveying line 11.

[0050] The screening conveying line 12 includes two screening conveying channels 121 arranged in the front-rear direction, the screening conveying channel 121 can use belt conveyor or chain plate conveyor, and the two screening conveying channels 121 have a screening gap 122 in the middle, which is always open to the lower part of the screening conveying channel 121, for the abnormal specification class to fall off. A plurality of inclined sliding plates 123 are arranged on the inner side of the two screening conveying channels 121, and the abnormal specification class falling off from the screening gap 122 can slide down along the inclined sliding plate 123. The abnormal specification collection line 13 is installed below the screening conveying channel 121 and opposite to the screening gap 122, for receiving the abnormal specification class falling off from the screening gap 122. The abnormal specification collection line 13 can use belt conveyor or chain plate conveyor.

[0051] A shunt plate 124 is arranged in the middle of the front end of the two screening conveying channels 121, the left and right two sides of the shunt plate 124 are respectively close to the inner side of the corresponding screening conveying channel 121, and the shunt plate 124 is inclined downward from the middle to the left and right two sides, thereby forming two sliding slopes falling into the two screening conveying channels 121 respectively. The waste plastic bottles falling from the first climbing conveying line 11 and falling on the screening conveying line 12, if falling from the left or right, can directly fall on the two screening conveying channels 121, and if falling from the middle, will fall on the shunt plate 124, and can slide on one of the screening conveying channels 121 along the shunt plate 124, so as to avoid falling directly into the screening gap 122. In addition, the front-rear length of the shunt plate 124 is greater than the length of the waste plastic bottles, so as to avoid sliding forward from the shunt plate 124 and falling into the screening gap 122.

[0052] The screening conveying line 12 further includes two falling hoppers 125, the upper end openings of the two falling hoppers 125 are connected with the rear ends of the two screening conveying channels 121, the waste plastic bottles pass through the screening conveying channel 121 and enter the upper end openings of the falling hoppers 125, and then fall from the lower end openings into the subsequent multi-stage arrangement device.

[0053] The screening mechanism comprises the capture cameras 14 and a screening manipulator, wherein the capture cameras 14 are provided with two, respectively located at the rear ends of the two screening conveying lines 12, and specifically can be installed on the dropping hoppers 125, the capture cameras 14 identify the abnormal specifications in the waste plastic bottles on the screening conveying passages 121, and then the abnormal specifications are thrown from the screening conveying passages 121 into the screening gaps 122 through the action of the screening manipulator. The screening manipulator comprises a plane rotating motor 151, a mechanical arm 152, a lifting rod 153 and a vacuum suction cup 154, wherein the plane rotating motor 151 is installed between the rear ends of the two screening conveying passages 121, the mechanical arm 152 is horizontally provided, the root thereof is installed on the plane rotating motor 151, the plane rotating motor 151 can drive the mechanical arm 152 to rotate on the plane, the lifting rod 153 is vertically installed at the end of the mechanical arm 152, the mechanical arm 152 is provided with a motor which can drive the lifting rod 153 to move up and down, and the vacuum suction cup 154 is installed at the bottom end of the lifting rod 153, the vacuum suction cup 154 is opened or closed through electromagnetic driving, and is used for sucking or releasing the abnormal specifications.

[0054] The multi-stage arrangement conveying device 2 comprises a second climbing conveying line 21 and a plurality of front-to-rear first-end-to-last-end connected plane arrangement conveying lines 22, wherein the front end of the second climbing conveying line 21 is connected with the two dropping hoppers 125 of the abnormal specification screening device 1, and the rear end is connected with the front end of the first plane arrangement conveying line 22. The second climbing conveying line 21 and the first climbing conveying line 11 have the same function, and are also preferably roller conveyors. The plurality of plane arrangement conveying lines 22 are arranged in front-to-rear order, the height thereof gradually decreases, and the conveying speed gradually increases, and the height of the rear end of the second climbing conveying line 21 is higher than that of the first plane arrangement conveying line 22. The waste plastic bottles conveyed through the second climbing conveying line 21 are all transversely arranged, and when falling on the first plane arrangement conveying line 22, the waste plastic bottles will jump due to the height difference. In the state that the plane arrangement conveying line 22 is started and runs, the waste plastic bottles will rotate by a certain angle, and after falling for many times, the waste plastic bottles will be adjusted from transverse to front-to-rear, and through the differential adjustment of the plurality of plane arrangement conveying lines 22, the waste plastic bottles are arranged into an orderly queue with a certain interval in front-to-rear order.

[0055] The plane arrangement conveying line 22 is preferably a belt conveyor, and the left and right sides thereof are provided with protective fences 221, and the middle of the plane arrangement conveying line 22 is provided with at least one partition fence 222, the protective fences 221 and the partition fence 222 divide the conveying surface of the plane arrangement conveying line 22 into a plurality of arrangement conveying passages 22-1 arranged side by side. In this embodiment, the partition fence 222 is provided with one, and the specific number is determined according to the specifications of the waste plastic bottles and the width of the plane arrangement conveying line 22.

[0056] The transverse waste plastic bottles will jump and their bottle caps or bottle bottoms will collide with the partition 222 or the guard rail 221 when the waste plastic bottles fall from the second climbing conveying line 21 to the first planar arrangement conveying line 22. In cooperation with the planar arrangement conveying line 22 in operation, the waste plastic bottles will rotate, the lighter waste plastic bottles will be adjusted from the transverse direction to the front-back direction, and the heavier waste plastic bottles or the waste plastic bottles still containing liquid will be adjusted from the transverse direction to the oblique direction. The oblique waste plastic bottles will be finally adjusted to the front-back direction after being adjusted by the planar arrangement conveying line 22 for multiple times.

[0057] The waste plastic bottles on the last planar arrangement conveying line 22 are all in the front-back direction and arranged in a certain interval queue, so the width of the partition 222 of the last planar arrangement conveying line is unchanged from back to front, that is, the width of the planar arrangement conveying channel 22-1 is consistent. The width of the partition 222 of the remaining planar arrangement conveying lines 22 gradually decreases from back to front. When the waste plastic bottles fall from the rear end of the previous planar arrangement conveying line 22 to the front end of the next planar arrangement conveying line 22, they will collide with the partition 222 or the guard rail 221, rotate by a certain angle and then continue to be conveyed forward. At this time, the bottle cap or the bottle bottom will gradually change from being in contact with the partition 222 to being separated from the partition 222, so that the resistance to the conveying of the waste plastic bottles is reduced and the forward moving speed of the waste plastic bottles is slowed down.

[0058] When the waste plastic bottles fall on the planar arrangement conveying line 22, if they fall on the partition 222, the waste plastic bottles will jump and finally fall on the arrangement conveying channel 22-1, but they will not fall on the arrangement conveying channel 22-1 at the first time and will appear a lag phenomenon, causing the waste plastic bottles to travel side by side with the waste plastic bottles falling later. Therefore, except for the last planar arrangement conveying line 22, the width of the partition 222 of the first to the second-to-last planar arrangement conveying line 22 is not less than the width of two waste plastic bottles arranged side by side, so as to avoid the two waste plastic bottles arranged side by side from being stuck when the above situation occurs. Since the waste plastic bottles falling on the last planar arrangement conveying line 22 have been arranged, the width of the partition 222 of the first to the second-to-last planar arrangement conveying line 22 is greater than the width of the partition 222 of the last planar conveying line, so that the arrangement conveying channel 22-1 of the last planar conveying line is narrower.

[0059] In order to enable the waste plastic bottles to fall on the arrangement conveying channel 22-1 as soon as possible after colliding with the partition 222 or the guard rail 221, the left and right sides of the partition 222 and the inner side of the guard rail 221 are provided with inclined surfaces 22-A, the bottom edges of the inclined surfaces 22-A extend to the arrangement conveying channel 22-1, and the waste plastic bottles will quickly slide down along the inclined surfaces 22-A after colliding with the partition 222 or the guard rail 221, thereby reducing the lag time of conveying.

[0060] In addition, the partition 222 of the first to the second-to-last planar arrangement conveying line 22 extends from the front end to the middle-rear part of the planar arrangement conveying line 22, and the length of the partition 222 extending to the middle-rear part is sufficient to adjust the direction of the waste plastic bottles, and can be reduced in length to reduce the self-weight. The partition 222 of the last planar arrangement conveying line 22 extends from the front end to the rear end of the planar arrangement conveying line 22, cooperates with the narrower arrangement conveying channel 22-1 of the last planar arrangement conveying line 22, and plays a role of keeping the position of the waste plastic bottles.

[0061] The left and right sides of the rear end of the arrangement conveying channel 22-1 of the last planar arrangement conveying line 22 are provided with slope plates 223, the bottom edges of the slope plates 223 extend to the arrangement conveying channel 22-1, the width between the bottom edges of the two slope plates 223 is less than the width of the conveying channel, and is not less than the width of a single waste plastic bottle.

[0062] If the waste plastic bottles falling from the second-to-last planar arrangement conveying line 22 are two waste plastic bottles connected in series or not in the middle position, when falling onto the last planar arrangement conveying line 22, the waste plastic bottles will collide with the slope plates 223, so that the first waste plastic bottle falls onto the arrangement conveying channel 22-1 first, and due to the acceleration of the conveying speed of the arrangement conveying channel 22-1, the first arrangement conveying channel 22-1 is conveyed backward first, and at this time, the second arrangement conveying channel 22-1 is still in the process of falling from the second-to-last planar arrangement conveying line 22 or is still in the process of falling, so that the two waste plastic bottles connected in series are separated.

[0063] Even if the waste plastic bottles are not in the middle position before falling, when falling onto one of the slope plates 223, the waste plastic bottles will slide down along the slope plate 223, and due to the width between the two slope plates 223 being less than the width of the conveying channel, the waste plastic bottles are finally adjusted to the middle position of the arrangement conveying channel 22-1. Therefore, after passing through the multi-stage arrangement conveying device 2, the waste plastic bottles are not only adjusted to an orderly queue in the front-rear direction and at a certain interval, but also kept in the middle position of the conveying channel, so that the subsequent identification and classification device 3 can accurately identify and classify.

[0064] In addition, the front side of the slope plate 223 is a slope, so that the length of the slope plate 223 gradually decreases from top to bottom, and therefore when the waste plastic bottles fall on the slope plate 223, only the middle-rear part of the waste plastic bottles will contact the slope plate 223, and the front end of the waste plastic bottles is suspended. When the waste plastic bottles slide down along the slope plate 223, the front end of the waste plastic bottles will first contact the arrangement conveying channel 22-1 and be conveyed forward, so as to quickly separate from the two slope plates 223, reduce the conveying lag, and avoid being rear-ended by the following waste plastic bottles.

[0065] In this implementation example, two columns are set up, each with three planar sorting conveyor lines, designated as Level 1, Level 2, and Level 3 planar sorting conveyor lines. The height difference between each level is approximately 10 cm, and the speed difference is approximately 0.2 m / s. The number of planar sorting conveyor lines depends on the actual application requirements and is not limited to three in this implementation example.

[0066] In this implementation case:

[0067] The primary planar sorting and conveying line divides the plastic bottles transported by the recycling plastic bottle sorting device into four sorting and conveying channels. Due to the height difference, the waste plastic bottles will bounce. One end of the waste plastic bottle will fall onto the sorting and conveying channel first. Through the driving force of the sorting and conveying channel, as well as the blocking effect of the guardrails and dividers, the waste plastic bottles will rotate at a certain angle. Most of the waste plastic bottles will be adjusted and rotated 90° to face forward and backward.

[0068] Secondary planar sorting conveyor line: Some of the waste plastic bottles conveyed by the primary conveyor belt are parallel to each other or at an angle. Due to the height difference between the primary and secondary planar sorting conveyor lines, the waste plastic bottles will fall again. One of the two parallel waste plastic bottles will hit the inclined baffle between the secondary waste plastic bottles. This waste plastic bottle will fall later than the other. Moreover, the speed of the secondary waste plastic bottles is greater than that of the primary waste plastic bottles. Through the differential speed, the two plastic bottles are sorted back and forth and their direction is further adjusted. Some of the angled waste plastic bottles are also further adjusted. The waste plastic bottles passing through the secondary planar sorting conveyor line are basically adjusted to be back and forth.

[0069] Three-stage planar sorting conveyor line: Waste plastic bottles that have passed through the two-stage planar sorting conveyor line will automatically return to the center position after being touched by the ramp plate of the three-stage planar sorting conveyor line. The speed of the three-stage planar sorting conveyor line is faster than that of the two-stage planar sorting conveyor line, which will further increase the spacing between the waste plastic bottles and complete the final adjustment.

[0070] The recognition and classification device 3 comprises a recognition and classification conveying line 31 for conveying the waste plastic bottles, an infrared detection camera 32, a recognition camera 33, a high-light infrared light source 34, and a high-light light source 35. The recognition camera 33 can be a line scanning camera or a plane camera, and the high-light infrared light source 34 can be a line scanning infrared camera or an infrared plane camera. The front end of the recognition and classification conveying line 31 is connected with the last plane arrangement conveying line 22, and the rear end is connected with the sorting device 4. Similar to the plane arrangement conveying line 22, the recognition and classification conveying line 31 is provided with a guard rail 311 on both sides and at least one partition rail 312 in the middle, so as to divide the recognition and classification conveying line 31 into a plurality of recognition and classification conveying channels 31-1 arranged side by side. In this embodiment, the recognition and classification conveying line 31 is provided with two recognition and classification conveying channels 31-1, and the partition rail 312 is provided with one, so as to connect the four recognition and classification conveying channels 31-1 with the arrangement conveying channel 22-1 of the last plane arrangement conveying line 22.

[0071] The partition rail 312 and the guard rail 311 of the recognition and classification conveying line 31 are used to prevent the waste plastic bottles from falling, and thus have a certain height. However, the waste plastic bottles need to be sorted after the recognition and classification by the recognition and classification device 3. Therefore, the guard rail 311 and the partition rail 312 extend from the front end to the middle of the recognition and classification conveying line 31, and the two sides of the recognition and classification conveying channel 31-1 are provided with a blocking strip 313 extending from the middle to the rear end, so as to connect the guard rail 311 and the partition rail 312. The height of the blocking strip 313 is lower than that of the guard rail 311 and the partition rail 312.

[0072] In this embodiment, the recognition and classification conveying channel 31-1 is preferably a chain plate conveyor. The high-light infrared light source 34 is arranged at the front end of each recognition and classification conveying channel 31-1 and located below the conveying surface of the recognition and classification conveying channel 31-1, so as to emit infrared light upward and irradiate the waste plastic bottles. The infrared detection camera 32 is arranged above the front end of the recognition and classification conveying channel 31-1 and used to shoot downward the waste plastic bottles. The high-light light source 35 is arranged above the middle or middle rear part of the recognition and classification conveying channel 31-1 and used to emit light downward and illuminate the waste plastic bottles. The recognition camera 33 is arranged above the middle or middle rear part of the recognition and classification conveying line 31 and above the high-light light source 35, and used to shoot downward the waste plastic bottles. In order to facilitate installation, a rack is arranged at the recognition and classification conveying line 31, and the infrared detection camera 32, the recognition camera 33, and the high-light light source 35 are all mounted on the rack. The scanning infrared camera is used to detect whether there is any impurity in the waste plastic bottles, and the recognition camera 33 is used to recognize the final classification of the waste plastic bottles.

[0073] The specific classification and recognition steps are as follows:

[0074] S1: The high-brightness infrared light source 34 irradiates the waste plastic bottle, and the recognition camera 33 photographs the waste plastic bottle to detect whether there are sundries in the waste plastic bottle. If there are sundries, the final classification is determined. If there are no sundries, S2 is performed.

[0075] S2: The high-brightness light source 35 irradiates the waste plastic bottle, and the recognition camera 33 photographs the waste plastic bottle. The photographed picture is compared with the model in the model library in terms of appearance characteristics to determine the final classification of the waste plastic bottle.

[0076] The model library in step S2 includes the following steps:

[0077] S21: A list of different waste plastic bottles is established, and the waste plastic bottles are classified to determine the final classification.

[0078] S22: Multiple images of each type of waste plastic bottle at different angles and different damage levels are collected.

[0079] S23: Different images of each type of waste plastic bottle are calibrated.

[0080] S24: The calibrated images of each type of waste plastic bottle are self-learned to generate a model.

[0081] Step S21 classifies the waste plastic bottles by at least three different attributes, including food grade or non-food grade, the type of liquid originally contained in the waste plastic bottle, the material of the waste plastic bottle, and the color of the waste plastic bottle. For example, according to the above three attributes, the following final classifications can be formed: food grade PET tea beverage juice bottle white (several hundred raw materials of different manufacturers such as Master Kong tea beverage, United tea beverage, Meijiersheng fruit juice, and Shuidongle beverage), food grade PET carbonated beverage white (several hundred raw materials of different manufacturers such as Coca-Cola soda, Yuanqi Forest soda bubble water, Nongfushansu soda natural water, and Pepsi), food grade PET mineral water pure water white (several hundred raw materials of different manufacturers such as Coca-Cola drinking water, United mineral water, Master Kong drinking water, and Nongfushansu natural water), food grade PET pure blue (Dangniudong, etc.), food grade PET pure green (Snowflake, etc.), food grade PET white blue (a few carbonated beverages), food grade PET miscellaneous color (small factory plastic bottles), food grade HDPE large white aluminum mouth (white translucent milk bottle with aluminum seal), food grade HDPE large white aluminum-free mouth (white translucent milk bottle without aluminum seal), food grade HDPE two white (white opaque milk bottle), non-food grade HDPE large white (white translucent daily chemical plastic bottle), non-food grade HDPE two white (white opaque daily chemical plastic bottle), HDPE miscellaneous color (HDPE plastic bottle other than white), and PP beverage bottle (a few manufacturers' plastic bottles such as Wahaha pure water).

[0082] The working principle is as follows:

[0083] Image collection: The list of waste plastic bottles needs to contain as many different waste plastic bottles as possible (including carbonated drinks, mineral water, purified water, tea, juice drinks, and dairy products, edible oil, etc.), at least 50 samples of each product are collected, and images of each sample of waste plastic bottles are collected (this part only works with recognition camera 33), and about 200-400 images of each plastic bottle at different angles and different damage levels are collected.

[0084] Raw material (sample) calibration: The collected images are classified by brand and model, and the raw materials of plastic bottles of the same model are numbered and information is noted. Use a dedicated calibration software such as Cognex ® VisionPro ® 7.0 system, or OpenCV of Shenzhen Artificial Intelligence and Robot Research Institute, etc. to delineate the plastic bottle body in each picture, and save the delineated plastic bottle body part to a designated folder;

[0085] Deep learning and modeling: Install learning and modeling software in a deep learning dedicated computer, such as paddlepaddle of Baidu or tensorflow of Google, etc. The software imports the calibrated sample pictures, and performs self-learning and generates a model. Deep learning principle: segment, slice, recognize color and other orientation features of the calibrated image, and obtain the model of the model plastic bottle through training. Deep learning basic process: model building > data preprocessing > model training > result visualization > testing.

[0086] When comparing the pictures taken by the recognition camera 33 with the model, the comparison information includes the brand, model, capacity, appearance, size, trademark, color, presence or absence of bottle cap, bar code, raw material quality, etc. of the waste plastic bottle.

[0087] In addition, there is a sorting station 42 in the subsequent sorting device 4 for sorting waste plastic bottles with debris, so that the waste plastic bottles with debris detected in step S1 are directly sorted by the sorting station 42, and the waste plastic bottles without debris are sorted by different sorting stations 42 after the final classification in step S2.

[0088] The sorting device 4 includes a sorting conveying line 41 for conveying waste plastic bottles, and sorting stations 42 arranged along the sorting conveying line 41. The sorting station 42 includes a sorting collection line 421 arranged transversely to the sorting conveying line 41, and a pushing mechanism (not shown in the figure) for sending the waste plastic bottles on the sorting conveying line 41 to the sorting collection line 421. Each sorting station 42 corresponds to the final classification of each waste plastic bottle.

[0089] Specifically, the sorting and collecting line 421 is arranged below the sorting conveying line 41, and the front end thereof is located at one side of the sorting conveying line 41 for receiving the falling waste plastic bottles, and the other end extends to the other side of the sorting conveying line 41. The sorting and collecting line 421 is provided with a baffle 4211 on the left and right sides thereof to prevent the waste plastic bottles from falling.

[0090] Considering that the pushing mechanism is easy to knock the waste plastic bottles when sorting, the sorting conveying line 41 is provided with a bottle falling baffle 422 on the left and right sides thereof. The bottle falling baffle 422 blocks the waste plastic bottles falling from the side of the sorting conveying line 41 due to the action of the pushing mechanism, so that the waste plastic bottles fall on the sorting conveying line 41.

[0091] The pushing device can be arranged in a jet structure or a mechanical pushing structure, which is a prior art and will not be described here.

[0092] Finally, it should be noted that: the above implementation cases are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing implementation cases, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing implementation cases, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the implementation cases of the present application.

Claims

1. A refined sorting and recycling assembly for waste plastic bottles, comprising, in sequence: an abnormal size screening device, a multi-stage sorting and conveying device, an identification and classification device, and a sorting device; An identification and sorting device includes an identification and sorting conveyor line for transporting waste plastic bottles, and an infrared detection camera, an identification camera, a high-brightness infrared light source, and a high-brightness light source installed on the conveyor line. The high-brightness infrared light source penetrates and illuminates the waste plastic bottles as they pass, and works with the infrared detection camera to photograph the bottles to detect whether they contain foreign matter. The high-brightness light source illuminates the bottles and works with the identification camera to photograph them, thus identifying the final classification of the waste plastic bottles. The conveyor line has guardrails on both sides and at least one divider in the middle, dividing it into multiple parallel identification and sorting conveyor channels. Each channel is equipped with both a high-brightness infrared light source and a high-brightness light source. The guardrails and dividers extend from the front end to the middle of the conveyor line. Barrier strips are installed on both sides of each channel from the middle to the rear end to connect the guardrails and dividers. The height of the barrier strips is lower than that of the guardrails and dividers. The abnormal size screening device includes a first inclined conveyor line, a screening conveyor line, an abnormal size collection line, and a screening mechanism set on the screening conveyor line. The first inclined conveyor line and the screening conveyor line are connected front to back. The first inclined conveyor line is inclined upward from front to back, and the screening conveyor line is set as a horizontal conveyor line. The height of the rear end of the first inclined conveyor line is higher than that of the screening conveyor line. Waste plastic bottles are conveyed by the first inclined conveyor line and fall into the screening conveyor line from its rear end. The screening mechanism is used to capture abnormal size items in the waste plastic bottles and send them into the abnormal size conveyor line. The screening conveyor line includes two screening conveyor channels arranged in the front-back direction, with a screening gap between the two screening conveyor channels. Multiple inclined slide plates are arranged along the inner side of the two screening conveyor channels. A diversion plate is arranged in the middle of the front end of the two screening conveyor channels, with the left and right sides of the diversion plate close to the inner side of the corresponding screening conveyor channel. The multi-stage sorting and conveying device includes a second inclined conveyor line and multiple interconnected flat sorting and conveying lines. Each flat sorting and conveying line has guardrails on both sides and at least one divider in the middle. The guardrails and dividers divide the conveying surface of the flat sorting and conveying lines into multiple parallel sorting and conveying channels. The inner side of each guardrail has a sloping surface, the bottom edge of which extends onto the sorting and conveying channel. The last flat sorting and conveying line has ramps on both sides of its rear end, the bottom edges of which extend onto the sorting and conveying channel. The width between the bottom edges of two ramps is less than the width of the conveying channel but not less than the width of a single waste plastic bottle. The waste plastic bottles on the last flat sorting and conveying line are arranged in a front-to-back direction in a queue with certain intervals. The width of the dividers on the last flat sorting and conveying line remains constant from back to front, while the width of the dividers on the remaining flat sorting and conveying lines gradually decreases from back to front.

2. The refined sorting and recycling assembly for waste plastic bottles according to claim 1, characterized in that, The high-brightness infrared light source is positioned at the front end of the identification and sorting conveyor line and below the conveying surface of the line, used to emit infrared light upwards to penetrate and illuminate the waste plastic bottles; the infrared detection camera is positioned above the front end of the identification and sorting conveyor line, used to photograph the waste plastic bottles downwards; the high-brightness light source is positioned above the middle or rear section of the identification and sorting conveyor line, used to emit light downwards to illuminate the waste plastic bottles; the identification camera is positioned above the middle or rear section of the identification and sorting conveyor line and above the high-brightness light source, used to photograph the waste plastic bottles downwards.

3. The refined sorting and recycling assembly for waste plastic bottles according to claim 1, characterized in that, The waste plastic bottle identification and sorting device also includes a frame, on which the infrared detection camera, identification camera, and high-brightness light source are all mounted.

4. The refined sorting and recycling assembly for waste plastic bottles according to claim 1, characterized in that, The identification and classification conveying channel is set as a chain plate conveyor.

5. A method for identifying and classifying waste plastic bottles using an identification and classification device, employing the refined sorting and recycling assembly for waste plastic bottles as described in claim 1, characterized in that the steps include... include: S1: A high-brightness infrared light source shines through the waste plastic bottle, and a recognition camera takes a picture of the waste plastic bottle to detect whether there are any foreign objects in the waste plastic bottle. If there are foreign objects, the final classification is determined; if there are no foreign objects, proceed to S2. S2: A bright light source illuminates the discarded plastic bottles, and a recognition camera takes pictures of the discarded plastic bottles. The pictures are compared with the models in the model library to determine the final classification of the discarded plastic bottles.

6. The identification and classification method according to claim 5, characterized in that, The steps for establishing the model library in step S2 include: S21: Create a list of different types of waste plastic bottles, classify the waste plastic bottles, and determine the final classification; S22: Collect multiple images of each type of discarded plastic bottle from different angles and with varying degrees of damage; S23: Label the different images of each type of waste plastic bottle; S24: Perform self-learning on the calibrated images of each type of waste plastic bottle to generate a model.

7. The identification and classification method according to claim 6, characterized in that, Step S21: Waste plastic bottles are classified according to at least three different attributes.

8. The identification and classification method according to claim 7, characterized in that, The attributes include whether it is food-grade or non-food-grade, the type of liquid originally contained in the waste plastic bottle, the material of the waste plastic bottle, and the color of the waste plastic bottle.

Images