Composite treatment process and system for waste plastic bottles

Abstract

The present invention relates to the technical field of waste plastic recovery, and more specifically, to an integrated treatment process and system for waste plastic bottles. The process includes a step of conveying and vertically adjusting waste plastic bottles, a drafting step, a feeding step, a slitting step, a step of sieving the waste material and plastic strips, a step of washing and initially draining the plastic strips, and a step of dehydrating and drying the plastic strips. The present invention first utilizes the physical properties of the cut pieces of the caps, neck rings, and bottle bodies to separate the cut pieces of the caps and neck rings and obtain the bottle body plastic strips. This eliminates the heating and steaming steps to remove the adhesiveness of the labels and the floating, washing, and filtering steps to remove foreign matter, thereby achieving energy savings and reducing wastewater. In conventional techniques, plastic fragments are first crushed to obtain plastic fragments, which are then sieved to separate them. However, the size of the plastic fragments is very small, making sorting difficult and resulting in low sorting accuracy. In contrast, the present invention obtains high-purity bottle body plastic strips, contributing to expanding the range of uses for recycled plastic.

Description

[Technical Field]

[0001] The present invention relates to the technical field of waste plastic recovery, and more particularly to a combined treatment process and a combined treatment system for waste plastic bottles. [Background technology]

[0002] Currently, most beverage bottles on the market are plastic bottles. Plastic bottles are mainly manufactured by adding various organic solvents to materials such as polyethylene or polypropylene. Plastic bottles are widely made from polyester (PET), polyethylene (PE), and polypropylene (PP) as raw materials. After adding the appropriate organic solvent and heating at high temperatures, plastic containers are formed by blowing, extruding, or injection molding using a plastic mold. Plastic bottles are characterized by their shatter-resistance, low cost, high transparency, and food-grade properties. Because the bottle body, cap, and neck ring of waste plastic bottles are made of different materials, the process of recycling plastic bottles requires the removal of labels, glue, and beverage residues, as well as the cap and neck ring needs to be further separated.

[0003] For example, Chinese Patent CN104647637A discloses a method and production line for recovering and processing plastic bottles, which includes the steps of sorting plastic bottles, shearing and crushing the sorted plastic bottles to obtain plastic bottle fragments, heating and steaming the plastic bottle fragments to remove the adhesiveness of the labels and the adhesiveness of any residual liquid, washing the plastic bottle fragments after steaming them in salt alkaline water by floating them and filtering them to remove foreign matter, agitating the plastic bottle fragments from which the foreign matter has been removed in a spiral horizontal direction, and polishing and washing the plastic bottle fragments through a sieve to remove black spots from the plastic bottle fragments, agitating the plastic bottle fragments from which the black spots have been removed in an upward spiral while blowing air upward from both sides to remove the labels from the plastic bottle fragments, and agitating the plastic bottle fragments from which the labels have been removed in an upward spiral while blowing air upward from both sides to heat and dry them. In the above technical proposal, sorted plastic bottles are crushed to form block-shaped plastic fragments, which are then washed, separated, identified and sorted to identify and sort the bottle bodies, caps and neck rings, which are made of different materials. This type of recycling and processing method not only consumes a lot of energy, produces a lot of wastewater and uses a lot of chemicals, but also has low separation purity, is expensive, and contains other waste fragments that have not been identified, limiting the uses of the recovered bottle body fragments. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to overcome the deficiencies of the prior art by providing a comprehensive treatment process and system for waste plastic bottles, which consumes less energy, produces less wastewater, and has high purity for the separated bottle body plastic strips, thereby expanding the use of recovered bottle body materials. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention adopts the following technical solutions.

[0006] A composite treatment process for waste plastic bottles is provided, the process comprising: a step S10 of supplying waste plastic bottles, conveying the waste plastic bottles by a first conveying mechanism, adjusting the axial direction of the waste plastic bottles in a first direction, the first direction being approximately the same as the conveying direction of the first conveying mechanism, identifying and sorting the waste plastic bottles after the direction adjustment to obtain target waste plastic bottles; a step S20 of transporting the target waste plastic bottles to a draft device, passing the target waste plastic bottles through draft gaps in the draft device to perform a first crushing and draft / expansion on the bottle bodies of the target waste plastic bottles; and a step S20 of transporting the target waste plastic bottles after draft / expansion to a feed roller group, the outer periphery of the feed roller group being provided with several recessed holes through which caps can pass, and performing a second crushing on the bottle bodies of the target waste plastic bottles through the feed gaps of the feed roller group, and The method includes step S30 of passing the caps of the target discarded plastic bottles, then transporting them to a slitting device by a group of feed rollers to perform slitting, cutting the bottle bodies of the discarded plastic bottles into plastic strips, and cutting the remaining parts of the discarded plastic bottles to obtain waste material, wherein the length dimension of the plastic strips is greater than the width dimension of the waste material in any direction and / or the weight of the plastic strips is greater than the weight of the waste material, and wherein the feed gap is smaller than the draft gap; step S40 of transporting the plastic strips and waste material obtained in step S30 to a sieving device, removing the waste material using the sieving device, and obtaining plastic strips; step S50 of transporting the plastic strips sieved in step S40 to a washing device and washing them; and step S60 of transferring the plastic strips washed in step S50 to a drying device to dry them, thereby obtaining bottle body plastic strips.

[0007] Here, "substantially coincident" means that the angle between the axis of the waste plastic bottle and the line on which the conveying direction of the first conveying mechanism 100 is located is 0° to 45°.

[0008] According to the combined processing process for waste plastic bottles of the present invention, in step S10, the positions of the waste plastic bottles are adjusted so that their axial direction is approximately aligned with the conveying direction of the first conveying mechanism, i.e., the waste plastic bottles are aligned in a first direction, facilitating slitting along the axial direction of the waste plastic bottles in the subsequent process. Then, in step S10, the waste plastic bottles are identified and sorted to obtain target waste plastic bottles, thereby improving the purity of the recovered materials. In step S20, the target waste plastic bottles arranged in the first direction are fed into a draft device. The folded and deformed waste plastic bottles are drafted through the draft gap of the draft device, unfolding and undergoing a first crushing. At the same time, the frictional force generated by the bottle body contacting the draft device removes the label paper from the bottle body surface and loosens dirt on the inner and outer surfaces of the waste plastic bottle to some extent. In step S30, the bottle body of the waste plastic bottle is crushed a second time through a feed gap smaller than the draft gap to facilitate slitting. The target discarded plastic bottles are fed into a slitting device, which cuts the bottle bodies into plastic strips and the remaining parts of the discarded plastic bottles into waste material. In step S40, a sieving device sieves the waste material by utilizing the different physical properties of the plastic strips and the waste material to obtain plastic strips. In step S50, the plastic strips are fed into a washing device and washed. In step S60, the washed plastic strips are dried to obtain clean bottle body plastic strips that are free of residual moisture.The combined treatment process of the present invention involves cutting bottle bodies to obtain plastic strips, thereby increasing the dimensional difference between the cut bottle bodies and the remaining cut portions of the target plastic bottles. By utilizing their physical properties, the remaining cut portions of the waste plastic bottles can be separated to easily obtain the bottle body plastic strips. This eliminates the need for heating and steaming steps to remove the adhesiveness of labels and the floating, washing, and filtering steps to remove foreign matter, thereby achieving energy savings and reducing wastewater volume. Conventional techniques involve first crushing plastic fragments, which are then sieved to separate them into different materials. However, due to the minute dimensions of the plastic fragments, sorting is difficult and the sorting accuracy is low. In contrast, the present invention produces high-purity bottle body plastic strips, contributing to expanding the range of uses for recycled plastic.

[0009] Preferably, the draft device includes two groups of draft rollers, and in step S20, the step of using the draft gap of the draft device to perform a first crushing and draft / stretching on the bottle body of the target plastic bottle to be discarded includes controlling the two groups of draft rollers of the draft device, bringing them into contact with two opposing sides of the target plastic bottle to generate a first frictional force and a second frictional force, respectively, and controlling the magnitudes of the first frictional force and the second frictional force so that they are not equal, and performing a first crushing and draft / stretching on the bottle body of the target plastic bottle to be discarded by the two groups of draft rollers.

[0010] Here, with regard to the first friction force and the second friction force, the directions of the first friction force and the second friction force may be the same, or the directions of the first friction force and the second friction force may be different. If the magnitudes of the first friction force and the second friction force are not equal, the first friction force may be greater than the second friction force, or the second friction force may be greater than the first friction force.

[0011] Preferably, in step S30, the step of performing slitting processing using the slitting device, cutting the bottle body of the discarded plastic bottle into plastic strips, and cutting the remaining portion of the discarded plastic bottle to obtain waste material includes cutting the bottle body of the discarded plastic bottle into plastic strips, cutting the cap of the discarded plastic bottle to obtain a first plastic block, cutting the neck ring of the discarded plastic bottle to obtain a second plastic block, and shearing the label paper to obtain label fragments, wherein the length dimension of the plastic strip is greater than the width dimension of the first plastic block and the second plastic block in any direction, and the weight of the plastic strip, the first plastic block, and the second plastic block is greater than the weight of the label fragments.

[0012] In the present invention, the cut pieces of the bottle body are referred to as plastic strips, the cut pieces of the cap are referred to as first plastic blocks, the cut pieces of the neck ring are referred to as second plastic blocks, and the cut pieces of the label paper are referred to as label fragments. Here, the plastic strip is a long piece with at least two parallel opposing sides and a length dimension significantly greater than its width dimension. When slit along the axial direction of the bottle body, the length of the resulting plastic strip corresponds to the height of the bottle body, and the width of the plastic strip is usually set to 2 cm to 3 cm. The thicknesses of the first plastic block and the second plastic block are both greater than the thickness of the plastic strip, and the dimensions of the first plastic block and the second plastic block in any direction are both smaller than the length of the plastic strip. Specifically, the maximum dimension of the first plastic block is equal to or less than the diameter of the cap, and the maximum dimension of the second plastic block is equal to or less than the diameter of the neck ring. The bottle body is slit along its axial direction, and the width of the plastic strip is 2 cm to 3 cm. The first plastic block is obtained by dividing the cap in half along the diameter or a direction parallel to the diameter. The second plastic block is obtained by dividing the neck ring in half along the diameter or a direction parallel to the diameter. The thickness of the label fragments is smaller than the thicknesses of the plastic strip, the first plastic block, and the second plastic block, generally smaller than 0.5 mm. The mass of the label fragments is smaller than the mass of the plastic strip, the first plastic block, and the second plastic block. The label fragments may have a regular or irregular sheet-like structure.

[0013] Preferably, step S40 is carried out by the steps of: conveying the plastic strip by a second conveying mechanism; adjusting the axial direction of the plastic strip in a second direction during the process of conveying the first plastic block, the second plastic block, and the label fragments; and conveying the plastic strip, the first plastic block, the second plastic block, and the label fragments along the second direction to a sieving device, wherein the second direction is approximately the same as the conveying direction of the second conveying mechanism; dropping and sorting the first plastic block and the second plastic block by the sieving device; sucking up and sorting the label fragments; obtaining the plastic strip; and conveying the plastic strip from the sieving device along the second direction; and in step S50, conveying the plastic strip along the second direction to the cleaning device.

[0014] Here, "substantially coincident" means that the angle between the axis of the plastic strip and the line on which the conveying direction of the second conveying mechanism is located is 0° to 45°.

[0015] The present invention further provides a comprehensive processing system for waste plastic bottles, comprising a feed device, a first conveying mechanism, a draft device, a feed roller group, a slitting device, a sieving device, a washing device, and a drying device, wherein the feed device is located above the start end of the first conveying mechanism, and the first conveying mechanism comprises several conveying units arranged in parallel, each conveying unit having a width dimension greater than the width dimension of the waste plastic bottles and smaller than the height dimension of the waste plastic bottles, the draft device is located below the end end of the first conveying mechanism, and comprises a draft roller group that rotates relative to one another, and the draft roller group is provided with a draft gap through which the target waste plastic bottles pass and which drafts and stretches the target waste plastic bottles, the feed roller group is located below the draft device and comprises a drive roller and a driven roller that rotate relative to one another, the minimum pitch between the drive roller and the driven roller is a feed gap, and the feed gap is smaller than the draft gap, and caps and caps are formed on the outer circumferential surfaces of both the drive roller and the driven roller. neck ring During the feeding process, the caps of waste plastic bottles and neck ring is located in the recess, while a second crushing is carried out on the bottle body through the feed gap, the slitting device is located below the group of feed rollers, and the slitting device includes several groups of cutters that can generate shearing force by relative rotation, and the bottle body of the target discarded plastic bottle is cut into plastic strips by the shearing force, and the cap, neck ring and label paper are also shredded to obtain waste materials, the sieving device includes a first vibrating plate, the starting end of which is located below the slitting device, the output port of the first vibrating plate is connected to the input end of the cleaning device, a hollowed-out structure is provided at the bottom of the first vibrating plate that can accommodate some of the fallen waste materials, and a suction device is provided above that can suck in and sort some of the waste materials, and the plastic strips at the output end of the cleaning device are fed into a drying device to be dehydrated and dried.

[0016] According to the waste plastic bottle composite processing system of the present invention, waste plastic bottles are fed into a first conveying mechanism by a feeding device and conveyed therein. The width of each conveying unit is designed so that waste plastic bottles can pass through only vertically or at an angle, thereby adjusting the orientation of the waste plastic bottles and arranging each plastic bottle approximately vertically, facilitating slitting along the axial direction of the waste plastic bottles in the subsequent process. The vertically arranged waste plastic bottles are fed into a drafting device, and the folded and deformed waste plastic bottles are drafted through the draft gap of the drafting device, unfolding and crushing them. At the same time, the frictional force generated by the bottle body contacting the drafting device removes the label paper from the surface of the bottle body in advance and loosens dirt on the inside and outside surfaces of the waste plastic bottle to some extent. The bottle body of the waste plastic bottle is further crushed through a feed gap smaller than the draft gap, facilitating slitting. Caps and caps are attached to both the outer periphery of the driving roller and the driven roller of the feeding device. neck ringThe system has recesses that can accommodate caps, neck rings, and bottle bodies to prevent differences in the materials of the caps, neck rings, and bottle bodies from affecting the extrusion effect on the bottle bodies. The waste plastic bottles are fed vertically into the slitting device, which cuts them along their axes, cutting the bottle bodies into plastic strips and the remaining parts of the waste plastic bottles as waste material. The first vibrating plate separates the waste material by utilizing the different physical properties of the plastic strip and the waste material to obtain the plastic strip. The plastic strip is then fed into the washing device, where it is first washed and then dehydrated to obtain clean, moisture-free bottle plastic strip. The integrated processing system of the present invention first separates the waste material by utilizing the difference in physical properties between the plastic strip obtained by cutting the bottle bodies and the waste material obtained by cutting the remaining parts of the waste plastic bottles. This eliminates the need for heating and steaming steps to remove the adhesiveness of labels and the floating, washing, and filtering steps to remove foreign matter, thereby achieving energy savings and reducing wastewater. In the prior art, plastic is first crushed to obtain plastic fragments, which are then screened for material classification, but the size of the plastic fragments is so small that sorting is difficult and the sorting accuracy is low.In contrast, the present invention obtains high-purity bottle body plastic strips, which contributes to expanding the range of uses for recycled plastic. [Effects of the Invention]

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] According to the integrated processing process and system for discarded plastic bottles of the present invention, first, the plastic strips and the remaining cut-off waste material from discarded plastic bottles, which have different physical properties, are separated to obtain the bottle body plastic strips, eliminating the need for the heating and steaming steps to remove the adhesiveness of the labels and the floating, washing, and filtering steps to remove foreign matter, thereby achieving energy savings and reducing wastewater volume. In prior art, plastic fragments are first crushed to obtain them, and then the plastic fragments are sieved to separate them into different materials. The size of the plastic fragments is very small, making sorting difficult and unreliable. In contrast, the present invention obtains high-purity bottle body plastic strips, contributing to expanding the range of uses for recycled plastic. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a schematic diagram of steps in a combined treatment process for waste plastic bottles in Example 1. FIG. [Figure 2] FIG. 10 is a schematic diagram of the steps of the combined treatment process for waste plastic bottles in Example 3. [Figure 3] FIG. 1 is a schematic diagram of the steps of the combined treatment process for waste plastic bottles in Example 4. [Figure 4] FIG. 2 is a structural schematic diagram of a first transport mechanism. [Figure 5] FIG. 10 is a structural schematic diagram of the first transport mechanism from another angle. [Figure 6] FIG. 2 is a structural schematic diagram of a draft device, a group of feed rollers, and a slit device. [Figure 7] FIG. 2 is a structural schematic diagram of a movable blade roller in a slitting device. [Figure 8] FIG. 10 is a structural schematic diagram of an elastic retaining ring in a slitting device. [Figure 9] FIG. 2 is a structural schematic diagram of a fixed blade plate in the slitting device. [Figure 10] FIG. 2 is a structural schematic diagram of a sieving device. [Figure 11] FIG. 2 is a structural schematic diagram of the sieving device from a different angle. [Figure 12]FIG. 2 is a structural schematic diagram of a cleaning device. [Figure 13] FIG. 10 is a structural schematic diagram of the cleaning frame passing between the first and second collision assemblies. [Figure 14] FIG. 2 is a structural schematic diagram of a cleaning frame, a first collision column, and a second collision column. [Figure 15] FIG. 2 is a structural schematic diagram of a drying device. [Figure 16] FIG. 10 is a structural schematic diagram of a third transport mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0020] The present invention will be further described below with reference to the embodiments for carrying out the invention. Here, the drawings are merely used for illustrative purposes, merely show schematic diagrams, are not actual drawings, and should not be understood as limitations on the present patent. In order to better understand the embodiments of the present invention, some parts in the drawings may be omitted or enlarged or reduced, but do not represent actual product dimensions, and those skilled in the art can understand that some known structures and their descriptions may be omitted in the drawings.

[0021] The same or similar symbols in the drawings of the embodiments of the present invention correspond to the same or similar components, and in describing the present invention, it should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "left", and "right" are based on the orientations or positional relationships shown in the drawings, and are merely for describing or simplifying the description of the present invention, and do not necessarily indicate or imply that the indicated devices or elements have a specific orientation or are configured or operated in a specific orientation. Therefore, the terms describing positional relationships in the drawings are merely used for illustrative purposes and should not be understood as limitations on the present patent, and those skilled in the art can understand the specific meanings of the above terms according to specific circumstances. Example 1

[0022] This embodiment is a first embodiment of a combined treatment process for waste plastic bottles. As shown in FIG. 1, waste plastic bottles are supplied and transported by a first conveying mechanism 100. The axial direction of the waste plastic bottles is adjusted to a first direction, and the first direction is approximately the same as the transport direction of the first conveying mechanism 100. The waste plastic bottles after the direction adjustment are identified and sorted to obtain target waste plastic bottles. Here, "approximately the same" means that the axis of the waste plastic bottle and the transport direction of the first conveying mechanism 100 are aligned. Step S10 means that the angle between the line and the target waste plastic bottle is 0° to 45°; Step S20 means that the target waste plastic bottle is transported to a draft device 200, and the target waste plastic bottle is passed through a draft gap 210 of the draft device 200, thereby performing a first crushing and draft / expanding on the bottle body of the target waste plastic bottle; Step S20 means that the target waste plastic bottle after drafting / expanding is transported to a feed roller group 300, and the feed roller group 300 has several recessed holes 340 on its outer periphery through which a cap can pass. a feed gap 330 of the feed roller group 300 for carrying out a second crushing operation on the bottle body of the target waste plastic bottle, and passing the cap of the target waste plastic bottle through the recess 340 of the feed roller group 300; the feed roller group 300 then transporting the bottle body to the slitting device 400 for slitting, cutting the bottle body of the waste plastic bottle into plastic strips, and cutting the remaining part of the waste plastic bottle to obtain waste material, the length dimension of the plastic strip being greater than the width dimension of the waste material in any direction and / or the weight of the plastic strip being greater than the weight of the waste material, wherein the feed gap 330 is smaller than the draft gap 210; a step S40 of transporting the plastic strip and waste material obtained in step S30 to a sieving device 500, removing the waste material using the sieving device 500, and obtaining a plastic strip; and a step S50 of transporting the plastic strip sieved in step S40 to a washing device 600 for washing.and step S60, in which the plastic strip washed in step S50 is transferred to a drying device 700 for drying, thereby obtaining a bottle body plastic strip.

[0023] In step S10, the direction of the waste plastic bottles may be adjusted by, but is not limited to, the following specific methods: Several transport units 110 are arranged in a first conveying mechanism 100, and the width of each transport unit 110 is greater than the width of the waste plastic bottles but less than the height of the waste plastic bottles. Two transport units form one transport unit group, and a first eccentric wheel 120 is provided between adjacent transport unit groups. A second eccentric wheel 130 is provided between the two transport units 110 in each transport unit group. The width of each transport unit group is greater than twice the width of the waste plastic bottles but less than the height of the waste plastic bottles. The second eccentric wheel 130 is located behind the first eccentric wheel 120 in the transport direction. During the process of transporting the waste plastic bottles, the first eccentric wheel 120 and the second eccentric wheel 130 can be rotated by a drive motor. When the target waste plastic bottles are transported in the first direction, it is convenient to slit the waste plastic bottles along their axial direction in the subsequent process.

[0024] If the metal-containing objects are not removed, the metal substances may have serious impacts on the processing equipment in subsequent processes. In daily life, discarded plastic bottles have various shapes and labels, and the material components of plastic bottles from different manufacturers are not exactly the same. Therefore, it is difficult to use the same equipment to draft, feed, and slit plastic bottles with different shapes.

[0025] Therefore, in step S10 of this embodiment, the step of identifying and sorting the waste plastic bottles after orientation adjustment and obtaining target waste plastic bottles as described above includes a first identification step of performing metal detection on the waste plastic bottles to obtain metal-containing objects and plastic objects, a second identification step of identifying the exterior labels and external features of the plastic objects to obtain target waste plastic bottles and non-target waste plastic bottles, and a sorting step of selecting and removing the metal objects and non-target waste plastic bottles to obtain the target waste plastic bottles. In this embodiment, in addition to removing non-target discarded plastic bottles and metal-containing objects, small objects contained in the raw materials of the discarded plastic bottles, whose dimensions in the conveying direction are smaller than the height of the discarded plastic bottles, may also be removed in this step.

[0026] If a metal substance is detected, an alarm can be sounded to remind the operator to remove the metal substance or metal-containing object. In addition, in this embodiment, magnetic metals can be attracted and removed before metal detection, reducing the metal content at the metal detection point and reducing the number of alarms due to metal substances.

[0027] In this embodiment, by identifying the exterior label and external characteristics of the waste plastic bottles, non-target waste plastic bottles are removed, and only target waste plastic bottles with matching labels and external characteristics are left and transferred to the next step. This not only enables smooth processing of waste plastic bottles, but also contributes to obtaining high-purity recovered products.

[0028] In this embodiment, the sorting of target and non-target plastic bottles may be done manually before loading, or the sorting may be done mechanically using the visual detector 150 during the process of being transported by the first conveying mechanism 100.In addition to adopting the method of mechanically sorting using the visual detector 150, the method of sorting target and non-target plastic bottles in this embodiment may also adopt an automatic identification method that can automatically identify labels and external features to perform mechanical sorting.

[0029] During the drafting and spreading process of step S20, the folded and deformed waste plastic bottles are drafted through the draft gap 210 of the draft device 200, whereby they are unfolded and crushed. At the same time, the frictional force generated by the bottle body contacting the draft device 200 removes the label paper from the surface of the bottle body in advance and loosens dirt on the inside and outside surfaces of the waste plastic bottle to some extent. While being drafted and spread, the target waste plastic bottles are transported to the feed roller group 300. Here, in this embodiment, the "vertical" direction generally refers to the direction in which the axis of the waste plastic bottle is vertical. Of course, this is merely a limitation imposed by the first conveying mechanism 100 so that the target waste plastic bottles fall into the draft device 200 by their own gravity along the first direction, and is not intended to limit the present invention.

[0030] In step S30, in order to maximize the difference in physical properties between the cut-off bottle body and the cut-off remaining part of the waste plastic bottle, in this embodiment, the target waste plastic bottle is cut along the axial direction when cutting, thereby obtaining a plastic strip whose length is approximately the same as the height of the waste plastic bottle.In order to obtain the plastic strip by cutting along the axial direction of the target waste plastic bottle by the slitting device 400, in this embodiment, after drafting and stretching, the target waste plastic bottle is transported to the feed roller group 300 along the axial direction of the target waste plastic bottle, and then transported by the feed roller group 300 along the axial direction of the target waste plastic bottle to the slitting device 400 for slitting processing, thereby obtaining a plastic strip whose length matches the height of the bottle body of the target waste plastic bottle, and here the axial direction of the target waste plastic bottle may be aligned vertically.

[0031] When a plastic bottle to be discarded is fed axially into the slitting device 400 for slitting, the slitting device 400 cuts the bottle body into plastic strips, and also cuts the cap, neck ring, and label paper along the axis of the plastic bottle to discard the bottle body into plastic strips, cuts the cap of the plastic bottle to obtain a first plastic block, cuts the neck ring of the plastic bottle to obtain a second plastic block, and shears the label paper to obtain label fragments, where the length of the plastic strip is greater than the width of the first plastic block and the second plastic block in any direction, and the weights of the plastic strip, the first plastic block, and the second plastic block are greater than the weight of the label fragments. The cut pieces of the cap and the cut pieces of the neck ring are both detached from the bottle body of the plastic bottle to be discarded. For ease of explanation, in this embodiment, the cut pieces of the cap are described as a first plastic block, the cut pieces of the neck ring are described as a second plastic block, and the cut pieces of the label paper are described as label fragments. Of course, it should be understood that the first plastic block, the second plastic block, and the label fragments are merely definitions for distinguishing the cut pieces of different parts of the target discarded plastic bottle, and do not limit the size or shape of the cut pieces of each part of the discarded plastic bottle.

[0032] In order to realize the sorting of the plastic strip, the first plastic block, the second plastic block, and the label fragments, step S40 in this embodiment is carried out as follows: conveying the plastic strip by the second conveying mechanism 510; during the process of conveying the first plastic block, the second plastic block, and the label fragments, adjusting the axial direction of the plastic strip to a second direction; and conveying the plastic strip, the first plastic block, the second plastic block, and the label fragments along the second direction to the sieving device 500, where the second direction is approximately the same as the conveying direction of the second conveying mechanism 510; dropping and sorting the first plastic block and the second plastic block by the sieving device 500, sucking up and sorting the label fragments, obtaining the plastic strip; and transporting the plastic strip from the sieving device 500 along the second direction; and in step S50, transporting the plastic strip along the second direction to the cleaning device 600.

[0033] If the cut pieces of the waste plastic bottles include plastic strips, first plastic blocks, second plastic blocks, and label fragments, in the sieving device 500, the dimensions of the first plastic blocks and second plastic blocks are significantly smaller than the length of the plastic strip, so the first plastic blocks and second plastic blocks can be sorted as they fall, and the sorted first plastic blocks and second plastic blocks can be collected as needed, and the label fragments can be sorted by sucking them up because they are light in mass, and the sorted label fragments can also be collected as needed, and the plastic strip is transported to step S50. Because the plastic strip and the first and second plastic blocks have different shapes, the first and second plastic blocks can be sieved out, and the label fragments can be separated by taking advantage of the fact that their mass is significantly smaller than that of the plastic strip, the first and second plastic blocks. This enables physical separation by taking advantage of the physical properties of the plastics, eliminating the need for steaming and flotation / sieving steps, reducing the amount of wastewater generated and significantly saving energy.In addition, in this embodiment, in order to ensure that the plastic strip is fed into the cleaning device 600 in the same direction, in step S40 of this embodiment, the plastic strip, the first plastic block, the second plastic block and the label fragments first fall into the second conveying mechanism 510, and then are conveyed to the sieving device 500 by the second conveying mechanism 510. During the conveying process, the position of the plastic strip is adjusted and the axial direction of the plastic strip is adjusted to a second direction, and the second direction is approximately aligned with the conveying direction of the second conveying mechanism 510. Here, "approximately aligned" means that the angle between the axial line of the plastic strip and the straight line on which the conveying direction of the second conveying mechanism 510 is located is 0° to 45°. When the angle is 0°, the axial direction of the plastic strip is aligned with the traveling direction of the plastic strip. In this case, the plastic strip is easily transported to the cleaning device in an orderly posture. In this embodiment, the second conveying mechanism is a preferred sieving mechanism for feeding the plastic strips into the cleaning device 600 in the same direction to achieve a relatively good cleaning effect, but is not intended to limit the present invention. Furthermore, the method for adjusting the direction of the plastic strips in this embodiment can be referred to the above-mentioned method for adjusting the direction of the discarded plastic bottles.

[0034] The composite treatment process of the present invention is as follows: First, step S10 adjusts the conveying direction of the waste plastic bottles, facilitating the subsequent drafting, stretching, and slitting processes. The target waste plastic bottles are then sorted to obtain the target waste plastic bottles and improve their purity. Step S20 unfolds and crushes the folded and deformed waste plastic bottles, removing the label paper from the bottle body in advance to loosen the dirt on the inside and outside of the waste plastic bottles. Step S30 cuts the target waste plastic bottles, cutting the bottle body to obtain plastic strips, and cutting the remaining portion of the target waste plastic bottles to obtain waste material. Step S40 sieves the waste material to obtain high-purity plastic strips. Step S50 cleans the plastic strips, avoiding the subsequent wet sieving step, making the entire treatment process simple and reliable. In the present invention, after the washing step, the plastic strip can be initially dehydrated by draining, and the plastic strip is dried in step S60 to obtain a bottle body plastic strip. The obtained bottle body plastic strip is a clean plastic strip with no residual moisture, and can be directly transferred to a granulating device and a molding device in sequence to be molded, or transferred to a packing process to be packed. The packed plastic strip can be transported to a molding plant or packed and sold directly.

[0035] The combined treatment process of the present invention involves cutting bottle bodies to obtain plastic strips, thereby increasing the dimensional difference between the cut bottle bodies and the remaining cut portions of the target plastic bottles. This facilitates the separation of the remaining cut portions of the waste plastic bottles by utilizing their physical properties. The physical properties of the cut caps, neck rings, labels, and bottle bodies are utilized to separate the caps, neck rings, and label paper, etc., to obtain the bottle body plastic strips. This eliminates the need for heating and steaming steps to remove the adhesiveness of the labels and flotation and filtration steps to remove foreign matter, thereby achieving energy savings and reducing wastewater volume. Conventional techniques require crushing to obtain plastic fragments, which are then sieved to separate the plastic fragments. However, the size of the plastic fragments is very small, making sorting difficult and unreliable. In contrast, the present invention produces high-purity bottle body plastic strips, thereby expanding the range of uses for recycled plastic. Example 2

[0036] This embodiment is a second embodiment of the composite treatment process for waste plastic bottles, and this embodiment is similar to the first embodiment, with the following differences:

[0037] The draft device 200 includes two groups of draft rollers, and in step S20, the step of performing a first crushing and drafting / stretching on the bottle body of the target plastic bottle to be discarded using the draft gap 210 of the draft device 200 includes controlling the two groups of draft rollers of the draft device 200, bringing them into contact with two opposing sides of the target plastic bottle to generate a first frictional force and a second frictional force, respectively, and controlling the magnitudes of the first frictional force and the second frictional force so that they are not equal, and performing a first crushing and drafting / stretching on the bottle body of the target plastic bottle to be discarded by the two groups of draft rollers.

[0038] In this embodiment, when the target waste plastic bottle passes through the draft gap 210, the first friction force and the second friction force between the two opposing surfaces of the target waste plastic bottle and the draft device 200 are unequal. In this case, since the friction forces applied to the outer surfaces of the two opposing surfaces of the target waste plastic bottle are unequal, the label on the outer surface is effectively removed and the dirt on the outer surface is also effectively loosened, and the inner surfaces of the two opposing surfaces of the target waste plastic bottle are relatively displaced by friction forces of different magnitudes, thereby loosening the dirt on the inner surface of the target waste plastic bottle.

[0039] In this embodiment, the structure of the draft device 200 allows different magnitudes of friction to be applied to two opposing sides of the target plastic bottle. For example, the draft device 200 of this embodiment may include two draft rollers, one of which has a rotation speed faster than the other, and the two draft rollers may be installed so that they come into contact with and rub against two opposing sides of the target plastic bottle. When the target plastic bottle passes through the draft gap 210 between the two draft rollers, the faster draft roller applies a greater friction force to the surface of the waste plastic bottle, and the slower draft roller applies a smaller friction force to the surface of the waste plastic bottle. For example, the two draft rollers of the draft device 200 of this embodiment have a surface roughness of one that is greater than the surface roughness of the other draft roller, and the two draft rollers each come into contact with and rub against two opposing surfaces of the target plastic bottle for disposal, and when the target plastic bottle for disposal passes through the draft gap 210 between the two draft rollers with different roughnesses, the draft roller with the greater roughness imparts a greater frictional force to the surface of the waste plastic bottle, and the draft roller with the lesser roughness imparts a smaller frictional force to the surface of the waste plastic bottle.

[0040] It should also be noted that in this embodiment, two groups of draft rollers may be provided, and one group of draft rollers may include two draft rollers with unequal rotation speeds or two draft rollers with different roughnesses. Specifically, the two groups of draft rollers may be composed of draft rollers with unequal rotation speeds, draft rollers with different roughnesses, or a combination of draft rollers with unequal rotation speeds and draft rollers with different roughnesses. The high-speed draft rollers and / or draft rollers with greater roughness respectively contact and rub against two opposing surfaces of the target plastic bottles to generate two contact frictions in opposite directions, thereby better achieving the effects of drafting and stretching, pre-removal of labels, and loosening of dirt. After step S20 and before step S30, the target waste plastic bottles that have completed drafting and expansion are first guided and transported to both sides of the feed roller group 300, and then moved from both sides toward the center by the action of the feed roller group 300. When the target waste plastic bottles are fed into the feed roller group 300 with their caps facing downward, the feed roller group 300 feeds them by a pulling method, but when the target waste plastic bottles are fed into the feed roller group 300 with their bottoms facing downward, the feed roller group 300 feeds them by friction and pushing methods. In this embodiment, the target waste plastic bottles after drafting and flattening are first branched off to either side and moved to either side of the feed roller group 300. The two sides of the feed roller group 300 are where the pressure of the feed roller group 300 is lowest, and the target waste plastic bottles then converge toward the feed gap 330. Because both the draft gap 210 and the feed gap 330 are narrow, this prevents the target waste plastic bottles from piling up above the feed roller group 300 after drafting and flattening, which would affect the feeding effect and feeding efficiency. The drop point of the feed roller group 300 is where the pressure of the feed roller group 300 is highest. During feeding, the rear target waste plastic bottles push out the front target waste plastic bottles, and the target waste plastic bottles are introduced into the slitting device 400 and pass through due to the pressure. Here, "forward" and "rearward" refer to the direction of movement of the target waste plastic bottles.

[0041] In step S30, when slitting is performed by the slitting device 400, slitting may be achieved by alternating shear forces between the movable blade and the fixed blade. Here, the movable blade and the fixed blade may be cutting blades, respectively, and the fixed and movable blades rotate relative to each other at the same speed to achieve slitting. The movable and fixed blades are made of hard alloy, and a small gap is maintained between the movable and fixed blades to ensure effective and efficient cutting and a relatively long thinning cycle. In this embodiment, the number of movable blades and the gap between the movable blades may be designed according to the width of the plastic strip.

[0042] In addition, in step S30, when slitting is performed by the slitting device 400, an elastic retaining ring 430 may be further provided which rotates in an opposing manner at the same rotation speed as the movable blade roller 410, and as the target plastic bottle passes between the fixed blade plate 420 and the movable blade roller 410, the elastic retaining ring 430 elastically abuts against the bottle body of the target plastic bottle, and there are multiple elastic retaining rings 430, and multiple abutments are formed between the multiple elastic retaining rings 430 and the bottle body, and shearing forces are alternately formed between the movable blade blade portion of the movable blade roller 410 and the fixed blade blade portion of the fixed blade plate 420, and the target plastic bottle is sheared by the shearing force, the bottle body is sheared to obtain plastic strips, the cap and neck ring are sheared to obtain first and second plastic blocks, and the label paper is sheared to obtain label fragments. The elastic support of the elastic retaining rings 430 applies a certain pressure to the bottle body, and the action of this pressure prevents the target waste plastic bottle from swinging left and right when cutting. At the same time, the pressure acts on the bottle body, generating a frictional force. The frictional force can also drive the target waste plastic bottle to slide downward at a uniform speed when several elastic retaining rings 430 and movable blade rollers 410 rotate oppositely. In other words, the pressure of the elastic retaining rings 430 ensures that the target waste plastic bottle moves vertically and stably downward at a uniform speed, and there is no risk of oscillation, multiple cuts, or cutting stoppage caused by the movable blade portion of the movable blade roller 410. In this embodiment, the outer periphery of the draft device 200, the feed roller group 300, and the slit device 400 can share a single housing to protect the internal devices of the housing, and the outer shape of the housing can be designed according to the outer shapes of the draft device 200, the feed roller group 300, and the slit device 400, thereby making the structure compact and improving the appearance. Example 3

[0043] This embodiment is a third embodiment of the composite treatment process for waste plastic bottles. As shown in FIG. 2, this embodiment is similar to the first or second embodiment, but differs from the first or second embodiment in the following respects.

[0044] In step S50, after the step of washing the plastic strip, a step of initially drying the plastic strip is further included. Specifically, the path along which the plastic strip is transported from step S40 to step S60 includes a first path and a second path that are provided in sequence. As the plastic strip moves along the first path, multiple washings are performed in sequence. As the plastic strip moves along the second path, moisture on the surface of the plastic strip falls off as droplets and separates. Here, the first path and the second path are divided into two layers, an upper layer and an lower layer, and the second path is located above the first path, thereby saving space in the device.

[0045] As the plastic strip moves along the first path, it is cleaned in the following order: The first cleaning is performed by immersing the plastic strip in a cleaning solution to remove floating dust and oil on the surface of the plastic strip; the second cleaning is performed by ultrasonic cleaning and mechanical vibration cleaning to loosen and remove dirt from the surface of the plastic strip; the third cleaning is performed by a combination of hot alkali, abrasive circulation, and mechanical vibration to rub the surface of the plastic strip and remove stubborn dirt and ink through chemical cleaning; and the fourth cleaning is performed by washing the plastic strip with a cleaning solution or clean water to reduce the chemical content on the surface of the plastic strip and separate the abrasives contained in the plastic strip. To further reduce the chemical and abrasive residues on the surface of the plastic strip, in this embodiment, one or more clean water cleanings may be performed after the fourth cleaning.

[0046] Specifically, a case where one more fresh water wash is performed after the fourth wash will be described as an example. The specific washing steps are as follows.

[0047] 1. First, a rough cleaning is carried out. The cleaning solution used in the rough cleaning can be the dirty solution filtered from the cleaning solution used in the remaining four steps, thereby achieving water and energy saving effects. Before the cleaning solution in the remaining four steps is discharged to the sewage treatment plant, it is used to soak and clean the floating dust and oil on the surface of the plastic strip. The rough cleaning can be done at room temperature.

[0048] 2. Using ultrasonic cleaning and mechanical vibration cleaning to loosen and remove dirt from the surface of plastic strips, the temperature of the cleaning liquid used in this cleaning step can be 45-55°C, and the ultrasonic and mechanical vibrations can loosen and remove some of the dirt, making it easier to clean. Here, ultrasonic cleaning and mechanical vibration cleaning are two different cleaning methods. Ultrasonic cleaning mainly relies on the cavitation, acceleration, and linear flow effects of ultrasound in the liquid to act directly or indirectly on the dirt, dispersing, emulsifying, and removing the dirt layer for cleaning. Mechanical vibration cleaning mainly relies on the impact or kneading force between the mechanical device and the object to be cleaned to loosen and remove the dirt.

[0049] 3. By combining hot alkali, circulation of abrasives and mechanical vibration, stubborn stains and ink can be removed by friction and chemical cleaning on the surface of the plastic strip, and the cleaning liquid used in this cleaning step can be an alkali liquid with a temperature of 65-75 degrees. The abrasives and mechanical vibration work together, and through the combined action of hot alkali, strong friction and chemical cleaning can be performed on the surface of the plastic strip to remove stubborn stains and ink.

[0050] 4. Washing the plastic strip reduces the chemical content on the surface of the plastic strip and separates the abrasive material contained in the plastic strip. The temperature of the washing liquid used in the washing step can be room temperature.

[0051] 5. By washing the plastic strip with clean water, the chemical residues and abrasive residues on the surface of the plastic strip can be further reduced. Specifically, the alkali / chemical residues on the surface of the plastic strip meet the standard, and no abrasive residues are visible to the naked eye.

[0052] As described above, during the sequential washing process of plastic products, rough cleaning removes floating dust and oil from the surface of the plastic strip. Then, ultrasonic cleaning and mechanical vibration cleaning remove easily cleanable dirt. Finally, a combination of hot alkali, abrasive circulation, and mechanical vibration removes stubborn dirt and ink. After two washes, the residual alkali / chemicals on the surface of the plastic strip meets the standard, and no visible abrasive residue remains. This results in a plastic strip for the bottle body. In this example, water is replenished using a stepwise water replenishment method. Water for steps 1 through 5 is replenished from the clean water tank 635 of step 5, and wastewater from steps 1 through 5 is discharged from the rough cleaning tank 631 of step 1. The wastewater from steps 2 and 3 is filtered through a ceramic membrane and reused as the cleaning liquid for steps 2 and 3. The filtered dirty liquid can be recycled to step 1 and used as the cleaning liquid for step 1, thereby reducing wastewater discharge and achieving energy savings. Example 4

[0053] This embodiment is similar to any one of Embodiments 1 to 3, with the following differences: Plastic strips may be made of different materials, have the same external shape, and are all transparent. For example, PET plastic strips may contain transparent plastic strips such as PMMA and PC. Although the content of such impurities is very small, they can seriously affect the quality of PET. Therefore, as shown in FIG. 3 , this embodiment further includes a step of transporting and sieving the bottle body plastic strips after step S60. The bottle body plastic strips are transported to a packaging process by a third conveying mechanism 900. During the process of transporting the bottle body plastic strips by the third conveying mechanism 900, the materials of the bottle body plastic strips are identified to obtain target and non-target plastic strips. The target plastic strips are then transferred to the packaging process, and the non-target plastic strips are sieved and collected. Here, material identification may be performed using a near-infrared detector. This embodiment enables the production of high-purity plastic strips, resulting in high product purity and significantly improved economic value. Example 5

[0054] As shown in Figures 4 and 5, this embodiment is a first embodiment of a composite processing system for waste plastic bottles, and includes a loading device, a first conveying mechanism 100, a drafting device 200, a feed roller group 300, a slitting device 400, a sieving device 500, a washing device 600, and a drying device 700. The loading device is located above the start end of the first conveying mechanism 100, and the first conveying mechanism 100 includes several conveying units 110 arranged side by side. The width dimension of each conveying unit 110 is larger than the width dimension of the waste plastic bottles, and the waste plastic bottles are The width of each group of conveying units is greater than twice the width of the waste plastic bottles but less than the height of the waste plastic bottles, and the second eccentric wheel 130 is located behind the first eccentric wheel 120 in the conveying direction. In this embodiment, a drive motor may be connected to both the first eccentric wheel 120 and the second eccentric wheel 130, and the drive motor drives the first eccentric wheel 120 and the second eccentric wheel 130 to rotate during the process of conveying the waste plastic bottles.

[0055] Here, the first conveying mechanism 100 needs to adjust the disordered waste plastic bottles in a first direction. In this embodiment, the first direction is a direction that approximately coincides with the conveying direction of the first conveying mechanism 100. The waste plastic bottles arranged in the first direction may be transported with their caps or bottoms facing forward. When waste plastic bottles are fed into the first conveying mechanism 100, each conveying unit group allows up to two waste plastic bottles arranged vertically to pass through, and does not allow waste plastic bottles arranged horizontally to pass through. The shape and orientation of the waste plastic bottles are adjusted horizontally or inclined by the first eccentric wheel 120. The width of each conveying unit 110 is half the width of the conveying unit group. The adjusted waste plastic bottles can be transported forward in an approximately vertical direction by the second eccentric wheel 130.

[0056] If metal substances in discarded plastic bottles are not removed, they can have a significant impact on processing equipment in subsequent processes. Therefore, in this embodiment, as shown in Figure 4, a metal detector 140 is installed above each transport unit 110. If metal substances are detected by the metal detector 140, an alarm can be sounded to remind the worker to remove the metal substances, or a signal can be sent to the controller, which can then control the controller to sift out the metal substances. To reduce the number of alarms caused by metal substances, in this embodiment, a magnet rack can be installed in front of the metal detector to attract and remove magnetic metals, thereby reducing the metal content in the metal detection area.

[0057] In everyday life, discarded plastic bottles vary in shape and label, and the material composition of plastic bottles from different manufacturers is not identical. This makes it difficult to process, feed, and slit plastic bottles of different shapes using the same equipment. Therefore, as shown in FIG. 4, a visual detector 150 is installed above each conveying unit 110 in this embodiment to distinguish between target and non-target plastic bottles by identifying the shape and label of the discarded plastic bottles. The non-target plastic bottles may contain small substances in addition to the plastic bottle itself. After identification is complete, the non-target plastic bottles are removed, and only the target plastic bottles with matching labels and shape characteristics are left and transported to the next step. This not only enables smooth processing of discarded plastic bottles, but also contributes to obtaining high-purity recycled materials.

[0058] Here, the removal of the target plastic bottles is achieved by a drawer plate and discharge assembly 160. The first conveying mechanism 100 includes a first conveyor belt and a first slide rail. The first conveyor belt is inclined upward. The metal detector 140 and the visual detector 150 are both installed above the first conveyor belt, and the first slide rail is inclined downward. First, discarded plastic bottles are placed on the first conveyor belt, and then the first conveyor belt transports and slides them along the first slide rail. Several discharge ports are aligned on the surface of the first slide rail. The drawer plate and discharge assembly 160 includes a drawer plate that fits the shape of the discharge ports and a drive mechanism attached to the back of the first slide rail. The drive mechanism drives the drawer plate to extend or lower, thereby opening and closing the discharge ports. When metal objects, small objects, and non-target waste plastic bottles are detected, the controller calculates and determines their positions on the first slide rail, and controls the lower drawer plate at the corresponding position to operate and open the discharge port, thereby removing the metal objects, small objects, and non-target waste plastic bottles. Of course, in addition to the drawer plate and discharge mechanism, the controller can also control, for example, other robots to pick up and remove the metal objects, small objects, and non-target waste plastic bottles.

[0059] In this embodiment, the draft device 200 may be located directly below the end of the first conveying mechanism 100, and the plastic bottles to be discarded in the first conveying mechanism 100 will fall into the draft device 200 due to their own gravity, with the cap facing downward or the bottom of the bottle facing downward. In this embodiment, the draft device 200 includes a group of draft rollers that rotate relative to one another, and the draft roller group is provided with a draft gap 210 through which the target plastic bottles to be discarded pass and draft and stretch the target plastic bottles. The target plastic bottles to be discarded are drafted and stretched through the draft gap 210 of the draft device 200, and the label paper on the surface of the discarded plastic bottles is removed in advance, and dirt on the surface of the discarded plastic bottles is loosened by frictional force. During the drafting and stretching process, vertically arranged discarded plastic bottles are fed into the draft device 200, and the folded and deformed discarded plastic bottles are unfolded and crushed by being drafted through the draft gap 210 of the draft device 200. At the same time, due to the action of frictional force generated when the bottle bodies come into contact with the draft device 200, the label paper on the surface of the bottle bodies is removed in advance, and dirt on the inner and outer surfaces of the discarded plastic bottles is loosened to a certain extent.

[0060] As shown in FIG. 6, the feed roller group 300 is located below the draft device 200 and includes a driving roller 310 and a driven roller 320 that rotate relative to each other. The minimum pitch between the driving roller 310 and the driven roller 320 is a feed gap 330, which is smaller than the draft gap 210. The driving roller 310 and the driven roller 320 are provided with caps and neck ring During the feeding process, the caps and neck ringis located in the recess 340, while the second crushing is performed on the bottle body through the feed gap 330. The cap is much harder than the bottle body, and it is difficult for the feed roller group 300 to push the cap and the bottle body to the same thickness. Therefore, the feed roller group 300 provided with the recess 340 can effectively crush the bottle body, while at the same time avoiding the accident of the very hard cap being caught and unable to pass through. In this embodiment, when the driving roller 310 and the driven roller 320 rotate oppositely, the positions of the recesses 340 on the outer surfaces of the driving roller 310 and the driven roller 320 may correspond one-to-one. When two recesses 340 at corresponding positions face each other, the gap between the two recesses 340 is larger than the size of the cap, and the length of the arc between two adjacent recesses 340 on the driving roller 310 and the driven roller 320 is approximately equal to the height of the bottle body. This allows the cap to pass smoothly through the feed gap 330, and the spacing between the roller surfaces of the recesses 340 can ensure the extrusion effect on the bottle body, avoiding interference between the discarded plastic bottles and reducing the risk of them getting caught. It also has a good bottle body stretching effect and a good crushing effect, resulting in high operational efficiency of the equipment.

[0061] The slitting device 400 is located below the feed roller group 300 and includes several cutter groups capable of generating shearing force through relative rotation. The cutter groups may be fixed and movable blades or fixed blade plates and movable blades. The shearing force is used to cut the target plastic bottle. In this embodiment, the slitting device 400 may be located directly below the feed roller group 300. The cutter groups cut the target plastic bottle along its axis, cutting the bottle body into plastic strips. The length of the plastic strips is approximately equal to the height of the target plastic bottle, and the width of the plastic strips is typically 2 cm to 3 cm. While cutting the bottle body, the cap, neck ring, and label paper are also cut along the axis of the target plastic bottle. The cut pieces of the cap and neck ring are both separated from the bottle body. In this embodiment, the cut piece of the cap is referred to as the first plastic block, the cut piece of the neck ring is referred to as the second plastic block, and the cut piece of the label paper is referred to as label fragments. When the target waste plastic bottle after drafting and expansion is cut along the axial direction of the target waste plastic bottle, the dimensions of the resulting first plastic block and second plastic block in either direction are much smaller than the length of the plastic strip, and in this way, the sieve openings can be set based on the dimensional difference to sift out the first plastic block and second plastic block.

[0062] As shown in Figures 10 and 11, the sieving device 500 includes a second conveying mechanism 510 and a first vibrating plate 520, the starting end of the second conveying mechanism 510 is located below the slitting device 400, and items at the end of the second conveying mechanism 510 can fall into the input port of the first vibrating plate 520, the second conveying mechanism 510 includes several transport units 511 arranged in parallel, the width dimension of each transport unit 511 is larger than the width dimension of the plastic strip and smaller than the length dimension of the plastic strip, the output port of the first vibrating plate 520 is connected to the input end of the cleaning device 600, and a hollowed-out structure is provided at the bottom of the first vibrating plate 520 to accommodate the falling first plastic blocks and second plastic blocks, and a suction device 540 is provided above.

[0063] Here, the installation for adjusting the transport belt is similar to that of the first conveying mechanism 100, and the orientation of the plastic strip is adjusted according to the dimensional design of the transport unit 511 and the transport unit group. Specifically, as shown in Figures 10 and 11, two transport units 511 form one transport unit group, and the width of each transport unit group is greater than twice the width of the plastic strip but less than the length of the plastic strip. A third eccentric wheel 512 is provided between adjacent transport unit groups, and a fourth eccentric wheel 513 is provided between the two transport units 511 of each transport unit group, with the fourth eccentric wheel 513 located behind the third eccentric wheel 512 in the transport direction. The principle of adjusting the orientation of the transport unit 511 and the transport unit group is similar to that of the first conveying mechanism 100, and will not be further described here.

[0064] Furthermore, as shown in Figure 10, the first vibrating plate 520 in this embodiment is a two-layer stainless steel vibrating sieve, and the first vibrating plate 520 is inclined downward along the moving direction of the plastic strip and includes a first vibrating sieve 521 and a second vibrating sieve 522 distributed vertically, the first vibrating sieve 521 is located above the second vibrating sieve 522, and a hole is provided at the bottom of the first vibrating sieve 521 to accommodate the fallen first and second plastic blocks, and a collection tank is provided at the bottom of the second vibrating sieve 522 to accommodate the fallen first and second plastic blocks. In this embodiment, holes may also be provided in the bottom of the second vibrating sieve 522 to accommodate the falling first and second plastic blocks. In this case, the holes in the bottom of the second vibrating sieve 522 and the holes in the bottom of the first vibrating sieve 521 are offset, improving the accuracy of sieving. To remove label fragments, in this embodiment, a suction device 540 is provided on the top of the first vibrating sieve 521 and a blower 530 is provided on the bottom of the second vibrating sieve 522. The suction device 540 cooperates with the blower 530 to remove the label fragments, and a collector may be provided to collect the sucked-in label fragments. The first and second plastic blocks and the plastic strip from which the label fragments have been removed slide across the screen surface while vibrating the surface of the first vibrating sieve 521, and are transported to the next process. If there is any plastic strip that falls from the first vibrating sieve 521 into the second vibrating sieve 522, the plastic strip also slides across the screen surface while vibrating the surface of the second vibrating sieve 522, and is transferred to the next process.

[0065] The plastic strip from which the first plastic block, the second plastic block and the label fragments have been removed is fed into the cleaning device 600, where it is washed and initially dehydrated, and the plastic strip at the outlet of the cleaning device 600 is fed into the drying device 700 where it is dehydrated and dried.

[0066] The operation process of this embodiment is as follows.

[0067] The waste plastic bottles are fed into the first conveying mechanism 100 by the feeding device and conveyed there. The width of each conveying unit 110 is designed so that the waste plastic bottles can pass only vertically or at an angle, thereby adjusting the orientation of the waste plastic bottles so that each plastic bottle is in the first direction, facilitating slitting along the axial direction of the waste plastic bottles in the subsequent process. The waste plastic bottles arranged in the first direction are fed into the drafting device 200. The folded and deformed waste plastic bottles are drafted through the draft gap 210 of the drafting device 200, unfolding and crushing them. At the same time, the friction generated by the bottle body contacting the drafting device 200 removes the label paper from the bottle body surface and loosens dirt on the inside and outside surfaces to some extent. The bottle body is further crushed through the feed gap 330, which is smaller than the draft gap 210, facilitating slitting. The caps and caps are attached to both the outer periphery of the driving roller 310 and the driven roller 320 of the feeder device. neck ringThe cap, neck ring, and bottle body are provided with a recess 340 that can accommodate the cap, neck ring, and bottle body, respectively, to prevent the difference in material between the cap, neck ring, and bottle body from affecting the extrusion effect on the bottle body. The discarded plastic bottles are fed vertically into the slitting device 400, which then cuts them along the axis of the discarded plastic bottle, cutting the bottle body into plastic strips, cutting the cap and neck ring into first and second plastic blocks, and shredding the label paper into label fragments. The width of each transport unit 511 in the second conveying mechanism 510 is designed so that the plastic strip can only pass through vertically or at an angle, thereby adjusting the orientation of the plastic strip to the second direction and facilitating its introduction into the cleaning device 600. The first vibrating plate 520 utilizes the different behavior of the plastic strip and the first and second plastic blocks to separate the first and second plastic blocks. Taking advantage of the fact that the mass of the label fragments is significantly smaller than that of the plastic strip, the first and second plastic blocks, the suction device 540 separates the label fragments, resulting in a plastic strip that is all vertically arranged. The vertically arranged plastic strip is introduced into the cleaning device 600 and first washed. After washing, the plastic strip is initially drained, avoiding the subsequent wet sieving step. By dehydrating the washed and initially dehydrated plastic strip, a clean plastic strip with no residual moisture can be obtained. The composite treatment system of the present invention first utilizes the physical properties of the cap, neck ring, and bottle body to separate the cap and neck ring to obtain a plastic strip of the bottle body, eliminating the heating and steaming steps to remove the adhesiveness of the label and the floating washing and filtering steps to remove foreign matter, thereby achieving energy savings and reducing wastewater volume.In conventional technologies, plastic fragments are first crushed to obtain them, and then the plastic fragments are sieved to determine their material, but the size of the plastic fragments is small, making sorting difficult and low in accuracy.In contrast, the present invention provides a high-purity bottle body plastic strip, which contributes to expanding the range of uses for recycled plastics. Example 6

[0068] This embodiment is a second embodiment of the composite treatment system for waste plastic bottles, and is similar to the fifth embodiment, with the following differences.

[0069] As shown in FIG. 6, the draft device 200 includes a first driven draft roller 220, a second driven draft roller 230, a first driven draft roller 240, and a second driven draft roller 250, and a drive mechanism is connected to both the first driven draft roller 220 and the second driven draft roller 230. The first driven draft roller 220 and the first driven draft roller 240 are arranged side by side in the vertical direction and are differentially connected between the first driven draft roller 220 and the first driven draft roller 240, the second driven draft roller 230 and the second driven draft roller 250 are arranged side by side in the vertical direction and are differentially connected between the second driven draft roller 230 and the second driven draft roller 250, the first driven draft roller 220 and the second driven draft roller 250 are arranged side by side in the horizontal direction and a draft gap 210 is provided between the first driven draft roller 220 and the second driven draft roller 250, and the second driven draft roller 230 and the first driven draft roller 240 are arranged side by side in the horizontal direction and a draft gap 210 is also provided between the second driven draft roller 230 and the first driven draft roller 240. Here, the first driven draft roller 220 and the second driven draft roller 230 are cylindrical rollers with rough surfaces that mainly serve to rub the surface of the bottle body. The first driven draft roller 220 rotates faster than the first driven draft roller 240, and the second driven draft roller 230 rotates faster than the second driven draft roller 250. The first driven draft roller 220 and the second driven draft roller 230 are located diagonally opposite each other, and rotate at the same speed but in opposite directions, both rotating toward the draft gap 210. The first driven draft roller 240 and the second driven draft roller 250 are plum-shaped rollers with notches 260 on their surfaces, the size of which needs to accommodate the cap, to prevent a hard cap from affecting friction and the draft and stretching effects.

[0070] In this embodiment, the draft device 200 includes two groups of differential speed draft rollers, and when waste plastic bottles pass through the draft gap 210 between the two groups of differential speed draft rollers, the faster draft roller applies a large frictional force to the surfaces of the waste plastic bottles, and the higher speed rollers of the two groups of differential speed draft rollers respectively contact and rub against two opposing sides of the target waste plastic bottles, removing labels and loosening dirt from the inner and outer surfaces while drafting and shaping the folded and deformed waste plastic bottles. To smoothly feed the target waste plastic bottles vertically into the draft gap 210 with their caps or bottoms facing downward, in this embodiment, an input hopper 270 may be provided directly above the draft gap 210, and the diameter of the input hopper 270 is set to be slightly larger than the width of the target waste plastic bottles to prevent the target waste plastic bottles from being fed in the direction of the feed roller group 300.

[0071] As shown in Figure 6, a partition plate 800 is provided between the draft device 200 and the feed roller group 300, and a first partition section 810 is provided at the top of the partition plate 800 for branching the plastic bottles to be discarded, and a second partition section 820 is provided at the bottom of the partition plate 800 for merging the plastic bottles to be discarded, with the first partition section 810 located directly below the draft gap 210 and the second partition section 820 located directly above the feed gap 330. In this embodiment, the first partition 810 first separates the drafted and flattened plastic bottles to move to both sides of the feed roller group 300, where the pressure of the feed roller group 300 is lowest. The second partition 820 then directs the drafted and flattened plastic bottles toward the feed gap 330. Because both the draft gap 210 and the feed gap 330 are narrow, the drafted and flattened plastic bottles are prevented from stacking above the feed roller group 300, which would affect the feeding effect and efficiency. The drop point of the feed roller group 300 is where the pressure of the feed roller group 300 is greatest. During feeding, the rearward target plastic bottles push out the forward target plastic bottles, and the target plastic bottles are introduced into the slitting device 400 and pass through due to the pressure. Here, "forward" and "rearward" refer to the direction of movement of the target plastic bottles. In order to ensure that the target plastic bottles to be discarded are fed into the slitting device 400 in a vertical position, in this embodiment, a lower hopper 350 may be provided directly below the feed gap 330, and the opening of the lower hopper 350 is large and the outlet is small, and the maximum width of the outlet of the lower hopper 350 is larger than the width of the bottle body and smaller than the height of the target plastic bottles to be discarded.

[0072] As shown in Figures 6 to 9, the slitting device 400 includes a movable blade roller 410, a fixed blade plate 420, and an elastic retaining ring 430. The movable blade roller 410 includes several cutting pieces 411 arranged in parallel at equal intervals and each equipped with a movable blade portion. The cutting pieces 411, elastic retaining ring 430, and movable blade roller 410 are arranged side by side horizontally, and the elastic retaining ring 430 rotates opposite to the movable blade roller 410 at the same rotation speed. The fixed blade plate 420 has alternatingly arranged first grids 421 and second grids 422. The edge of the first grid 421 is formed with fixed blade portions that have a small gap between them and the movable blade portion and cooperate to generate slit shear stress. Multiple groups of elastic retaining rings 430 can pass through the second grid 422 and are pushed out to contact the surface of the target plastic bottles to be disposed of at multiple points. The spacing between adjacent cutting pieces 411 is greater than half the diameter of the cap but less than the diameter of the cap, ensuring that each cutting piece 411 cuts through the cap and neck ring without any missed cuts, and the spacing between adjacent cutting pieces 411 is greater than 1 / 4 the diameter of the target plastic bottle but less than 1 / 3 the diameter of the target plastic bottle, in which case, by installing four groups of elastic retaining rings 430 and four groups of cutting knives, the bottle body of the plastic bottle can be slit. The spacing between cutting pieces 411 can be designed according to the shape and size of the waste plastic bottle and the width and dimension of the plastic strip, and the above spacing dimensions are not a limitation of the present invention. In order to prevent waste plastic bottles that have not been completely cut from falling off and to ensure that the waste plastic bottles are cut sufficiently, in this embodiment, an arc-shaped bottom portion 423 is provided at the bottom of the fixed blade plate 420, and the gap between one end of the arc-shaped bottom portion 423 and the bottom of the fixed blade plate 420 and the gap between the other end of the arc-shaped bottom portion 423 and the outer periphery of the movable blade roller 410 gradually increase, and the other end of the arc-shaped bottom portion 423 extends to almost directly below the center of the movable blade roller 410.

[0073] During the cutting process, a constant pressure is applied to the bottle body with the support of the elastic force of the elastic retaining ring 430. The pressure prevents the target plastic bottle from swinging back and forth when being cut. Instead, the pressure acts on the bottle body, generating friction. Due to the friction, when several elastic retaining rings 430 and movable blade rollers 410 rotate oppositely, the target plastic bottle can be driven to slide downward at a uniform speed, without being shaken by the movable blade portion of the movable blade roller 410 or causing multiple cuts or cutting stops. Strong shear forces are generated vertically and alternately within the slit between the movable blade portion of the cutting piece 411 of the movable blade roller 410 and the fixed blade portion of the fixed blade plate 420. The shear forces are used to shear the target plastic bottle, shearing the bottle body to obtain plastic strips, shearing the cap and neck ring to obtain first and second plastic blocks, and shearing the label paper to obtain label fragments.

[0074] In this embodiment, the arrangement of the slitting device 400 is a preferred choice for obtaining regular and stable plastic strip slitting, and is not intended to limit the present invention. For example, the present invention can be applied to a cutting method in which the fixed blade roller and the movable blade roller 410 rotate relative to each other, or a cutting method in which the movable blade roller 410 and the fixed blade plate 420 rotate relative to each other. Example 7

[0075] This embodiment is a third embodiment of a composite processing system for waste plastic bottles, and this embodiment is similar to Embodiments 5 and 6, with the following differences: As shown in Fig. 12, the cleaning device 600 includes a transport assembly 610 on which a plurality of cleaning frames 612 are provided, a cleaning assembly 630, and a dripping assembly 640, and several openings are provided on the top of the cleaning frame 612 for accommodating plastic strips. The cleaning frame 612 receives the plastic strips from the first vibrating sieve 521 and transports them to the cleaning assembly 630 and the dripping assembly 640 in order by the transport assembly 610, and the plastic strips in the cleaning frame 612 after washing and dripping are transported to the drying device 700.

[0076] The transport assembly 610 includes a transport chain 611 and a cleaning frame 612, and the transport chain 611 is used to transport the cleaning frame 612. Since the transport chain 611 is a well-known technology in the transportation field, this embodiment does not change the transmission method of the transport chain 611, but only changes the layout of the transport chain 611. Specifically, in this embodiment, the transport chain 611 surrounds a frame-type transport path distributed vertically in the space, the upper horizontal part is the second path, in which initial drying is performed, and the lower horizontal part is the first path, in which the cleaning process is performed. The transport assembly 610 of this embodiment uses a step-type transport mode, and the transport distance each time it is driven is the distance between two adjacent cleaning frames 612. That is, each time it is driven, the cleaning frame 612 in the previous position moves to the cleaning frame 612 in the next position. The transport assembly 610 of this embodiment can also drive the cleaning frame 612 to move up and down. When the cleaning frame 612 needs to enter the cleaning tank for cleaning, the transport chain 611 drives the cleaning frame 612 to descend. When the cleaning frame 612 needs to leave the cleaning tank, the transport chain 611 drives the cleaning frame 612 to ascend. The lifting distance of the cleaning frame 612 and the stroke of the cleaning frame 612 at a certain height can both be realized by designing the control program for the transport chain 611. Since this type of transport control mode is also a common transport mode in the transportation field, the specific structure of the transport chain 611 will not be described in this embodiment. The input station for inputting plastic strips into the washing frame 612 and the discharge station for discharging plastic strips from the washing frame 612 are both located next to the transport chain on the left side, and the discharge station is located above the input station, making it easy to quickly transport empty washing frames 612 to the input station for insertion.

[0077] 14, the cleaning frame 612 of this embodiment is designed as a cube with an open top. The direction of movement of the cleaning frame 612 on the first path is to the right. The front, rear, and bottom surfaces of the cleaning frame 612 are mesh plates, and the left and right sides of the cleaning frame 612 are solid side panels. The opening on the top surface of the cleaning frame 612 allows the plastic strips arranged by the vibration of the first vibrating plate 520 to slide easily onto the cleaning frame 612. The length of the plastic strips is aligned with the direction of movement of the cleaning frame 612, and the left and right sides of the cleaning frame 612 are solid side panels, so the plastic strips do not slide off the cleaning frame 612. Because the density of the plastic strips is greater than the density of water and the cleaning liquid in each cleaning tank, the plastic strips do not float after being introduced into the cleaning frame 612 but move along with the movement of the cleaning frame 612. The front and rear surfaces of the cleaning frame 612 are mesh plates, which allow bubbles generated by ultrasonic waves or compressed air to enter the cleaning frame 612, easily generating cavitation on or between the plastic strips, and facilitating the escape of abrasives from the cleaning frame 612. Meanwhile, the bottom surface of the cleaning frame 612 is a perforated plate, allowing the second collision posts 663 to pass through the perforated plate and collide with the plastic strips. In this embodiment, the vibration time of the first vibrating plate 520 and the time interval between two vibrations can be controlled to control the approximate number and weight of plastic strips sliding into the cleaning frame 612 with each vibration. In this embodiment, the outlet of the first vibrating plate 520 can be extended to facilitate the insertion of plastic strips.

[0078] As shown in Figure 12, the cleaning assembly 630 includes a rough cleaning tank 631, a first combined cleaning tank 632, a second combined cleaning tank 633, a washing tank 634, and a clean water tank 635, which are arranged in this order. Both the first combined cleaning tank 632 and the second combined cleaning tank 633 are provided with a first collision post 653 and a second collision post 663, which can be positioned above and below the cleaning frame 612, respectively. A first driving member 651 and a second driving member 661 are connected to the first collision post 653 and the second collision post 663, respectively. Passages are provided at both the top and bottom of the cleaning frame 612 to accommodate the first collision post 653 and the second collision post 663 and to collide with the plastic strip. An ultrasonic cleaner is provided in the first combined cleaning tank 632. An abrasive supply device 670 is further connected to the second combined cleaning tank 633, which can transport abrasives into the cleaning frame 612. Of course, the cleaning tanks provided are not limited to the above five cleaning tanks, and the number and properties of the cleaning tanks can be adjusted according to the object to be cleaned. In this embodiment, the rough cleaning tank 631, the first combined cleaning tank 632, the second combined cleaning tank 633, the washing tank 634 and the clean water tank 635 are used as examples, and will be specifically described as follows. Rough cleaning tank 631: Rough cleaning is performed by immersion, and the structure of the rough cleaning tank 631 does not have a special structural design.

[0079] First combined cleaning tank 632: An ultrasonic cleaner is installed on the bottom or inner wall of first combined cleaning tank 632, which generates bubbles and vibrations to loosen dirt on the surface of the plastic strip. The generated bubbles move upward and enter the cleaning frame 612 through the mesh plates on the front and rear sides of the cleaning frame, and the airflow can remove the cleaned impurities from between the plastic strips. As shown in FIG. 13, first combined cleaning tank 632 is equipped with a first collision assembly 650 and a second collision assembly 660. First collision assembly 650 includes a first driving member 651, a first mounting plate 652, and several first collision posts 653. First mounting plate 652 is connected to the output end of first driving member 651, and several first collision posts 653 are uniformly mounted on first mounting plate 652. Second collision assembly 660 is equipped with a second driving member 661. The cleaning frame 612 includes a first driving member 651 and a second driving member 661, a second mounting plate 662, and several second collision posts 663. The second mounting plate 662 is connected to the output end of the second driving member 661. The several second collision posts 663 are uniformly distributed and attached to the second mounting plate 662. In the initial state, the distance between the ends of the first collision post 653 and the second collision post 663 is greater than the height of the cleaning frame 612, so that the cleaning frame 612 can pass between the first collision post 653 and the second collision post 663. When the cleaning frame 612 moves below the first collision post 653 and above the second collision post 663, the first driving member 651 and the second driving member 661 move to respectively drive the first collision post 653 and the second collision post 663 to collide with the plastic strip, thereby loosening dirt on the inner and outer surfaces of the plastic strip. In this embodiment, various collision types can be realized by setting the positions of the first collision post 653 and the second collision post 663.When the axes of the first collision column 653 and the second collision column 663 are installed so that they are on the same line, the stroke limit of the first driving member 651 and the second driving member 661 is when the distance between the bottom end of the first collision column 653 and the top end of the second collision column 663 is zero. At this time, the first collision column 653 and the second collision column 663 respectively collide with the upper and lower surfaces of the plastic strip at the same position. When the axes of the first collision column 653 and the second collision column 663 are not on the same line but are installed alternately, the stroke limit of the first driving member 651 and the second driving member 661 is when the distance between the first collision column 653 and the second collision column 663 is negative. "Negative distance" means that in this state, the vertical height at which the top end of the second collision column 663 is located is higher than the bottom end of the first collision column 653. In this case, the upper and lower collision positions of the first collision post 653 and the second collision post 663 are alternately arranged, causing twisting and bending of the plastic strip, making it easier to loosen dirt adhering to the plastic product. In this embodiment, the first driving member 651 and the second driving member 661 may be driven by a cylinder, and compressed air discharged when the cylinder is operated is discharged from below the cleaning frame 612 to form air bubbles. The air bubbles move upward and can enter the cleaning frame through the mesh plates on the front and rear sides of the cleaning frame 612, allowing the airflow to remove impurities that have been washed between the plastic strips.

[0080] Second combined cleaning tank 633: The cleaning liquid in the second combined cleaning tank 633 is hot alkali. In addition to being equipped with a first collision assembly 650 and a second collision assembly 660 similar to those in the first combined cleaning tank 632, the second combined cleaning tank 633 also includes an abrasive supply device 670. The outlet of the abrasive supply device 670 should be located directly above the retention position of the cleaning frame 612 in the second combined cleaning tank 633 and above or before the first collision assembly 650 to ensure that the abrasive is filled into the cleaning frame 612 when the first collision assembly 650 and the second collision assembly 660 are operating. Here, the abrasive has a granular structure with a diameter of 3 mm to 8 mm. The abrasive material may be stainless steel, aluminum alloy, filled modified plastic, etc., and the abrasive is sand-like and has a specific gravity greater than that of water. The abrasive material is added from above the cleaning frame 612 and remains in the space between the upper layer of the plastic strip and the plastic strip. Then, the first collision assembly 650 and the second collision assembly 660 collide with the plastic strip from above and below. During the collision process, the plastic strip twists and moves, causing the space between the plastic strips to continuously change, resulting in continuous and effective friction between the abrasive material and the surface of the plastic strip. The high-concentration abrasive material also continues to flow from top to bottom and to both sides within the space of the cleaning frame 612, causing the abrasive material to flow and cover the space within the cleaning frame 612, like river water containing a large amount of sediment. The high-concentration abrasive material rubs against most of the surface of the plastic strip and continues to flow, peeling and removing dirt from the surface of the flexible plastic strip, realizing surface renewal and continuous frictional cleaning. The synergistic effect of the stubborn dirt from the hot alkali chemical cleaning and the surface of the plastic strip allows stubborn dirt and ink to be removed in a short time.

[0081] Washing tub 634: The washing tub 634 is a room temperature tub, and the cleaning liquid used in the washing tub 634 can be water, a weak acidic cleaning liquid, or other cleaning liquid with reduced alkaline / chemical content, which can reduce the alkaline / chemical content and wash away the small amount of abrasive material contained in the plastic strip.

[0082] Clean Water Tank 635: The clean water tank 635 is a room temperature tank, and the cleaning liquid used in the clean water tank 635 is water. The clean water tank 635 ensures that the residual alkali / chemicals on the surface of the plastic strip meets the standard, and no abrasive remains. Any small amount of abrasive that may remain after cleaning can be completely removed by applying intermittent water spraying and high-speed rotation in the drying device 700.

[0083] In this embodiment, the rough cleaning tank 631, the first combined cleaning tank 632, the second combined cleaning tank 633, the washing tank 634, and the fresh water tank 635 are replenished with water in stages. That is, fresh water is replenished into the fresh water tank 635, the water in the fresh water tank 635 flows into the washing tank 634, the cleaning liquid in the washing tank 634 flows into the second combined cleaning tank 633, the second combined cleaning tank 633 flows into the first combined cleaning tank 632, and the cleaning liquid in the first combined cleaning tank 632 flows into the rough cleaning tank 631. The cleaning liquid in the rough cleaning tank 631 has the highest concentration, and the cleaning liquid therein is discharged as wastewater. Replenishing water in this manner saves energy and reduces wastewater discharge.

[0084] 12, the abrasives in the second combined cleaning tank 633 of this embodiment can be recovered. Specifically, the abrasive supply device 670 includes a power unit 671, a water inlet pipe 672, and a water outlet pipe 673. The water inlet pipe 672 and the water outlet pipe 673 are connected to the power unit 671, and the water inlet pipe 672 is connected to the bottom of the second combined cleaning tank 633, while the water outlet pipe 673 is located above the cleaning frame 612. Excess abrasives are continuously added and leak into the recessed bottom of the second combined cleaning tank 633 through the bottom and both left and right sides of the cleaning frame 612. The abrasives are then pumped by the power unit 671 above the cleaning frame 612 and circulated.

[0085] In addition, in this embodiment, a water circulation device 680 is further provided, which includes a membrane filter 681, a water inlet 682 of the membrane filter 681 connected to the first composite cleaning tank 632 and the second composite cleaning tank 633, a clean liquid outlet 683 of the membrane filter 681 connected to the first composite cleaning tank 632 and the second composite cleaning tank 633, and a dirty liquid outlet 684 of the membrane filter 681 connected to the rough cleaning tank 631, and the dirty water formed in the rough cleaning tank 631 is discharged.

[0086] The drip assembly 640 includes a drain pan 641 located at the bottom of the washing frame 612 in the second path. Moisture on the surface of the plastic strip flows from the bottom and left and right sides of the washing frame 612 into the drain pan 641, allowing for initial dehydration. Example 8

[0087] This embodiment is a fourth embodiment of the composite processing system for waste plastic bottles, and is similar to any one of the embodiments from embodiment 5 to embodiment 7, with the following differences: As shown in Figure 16, a discharge outlet 760 is provided in the drying device 700, a third conveying mechanism 900 is provided at the discharge outlet 760 for conveying the bottle body plastic strip to the packaging process, a near-infrared detector 910 is provided above the third conveying mechanism 900, a discharge outlet is opened in the third conveying mechanism 900, a drawing plate mechanism 920 is provided at the discharge outlet, and the near-infrared detector 910 and the drawing plate mechanism 920 are both connected to a controller.

[0088] The top of the drying device 700 is open or has a retractable cover, and the initially dried cleaning frame 612 rotates around the bearings, allowing the plastic strips in the cleaning frame 612 to be inserted into the drying device or inserted into a slide rail and then slid from the slide rail into the drying device 700. The rotatable connection between the cleaning frame 612 and the transport chain is a common and mature installation in the transportation field, and will not be further described in this embodiment.

[0089] As shown in FIG. 15, the drying apparatus 700 includes a centrifugal drive mechanism 710, an inner screen 720, a case 730, and a lifting cylinder 740. The inner screen 720 can be connected to the output end of the centrifugal drive mechanism 710. A cavity exists between the inner screen 720 and the case 730. One water outlet 750 and one discharge outlet 760 are provided in the cavity and communicate with each other. The inner screen 720 is connected to the output end of the lifting cylinder 740, and the connection between the two is formed in the form of an annular recess and an annular protruding block. The lifting and lowering movement of the inner screen 720 does not affect the rotation of the inner screen 720 around its own axis. The lifting cylinder 740 drives the inner screen 720 to lower it until it connects with the output end of the centrifugal drive mechanism 710, causing the inner screen 720 to rotate at high speed, dehydrating the plastic strip. During the dehydration process, the inner screen quickly removes any traces of abrasive that may remain on the plastic strip. To ensure complete removal of the abrasive, intermittent water spraying is performed on the plastic strip after dehydration is complete, and high-speed dehydration is continued. The centrifugal force causes the water droplets to interact with the plastic strip, completely removing any abrasive in blind spots. The lifting cylinder 740 drives the inner screen 720 to raise it until it separates from the output end of the centrifugal drive mechanism 710, gradually reducing the rotation speed of the inner screen 720. At this time, the water outlet 750 is opened to drain water, and the discharge outlet 760 is opened to discharge water. The centrifugal force causes clean, moisture-free plastic strip to be ejected from the discharge outlet 760. The plastic strip is ejected from the outlet 760 to a third conveying mechanism 900, which may be a stainless steel slide rail that slopes from high to low, with a near-infrared detector 910 provided above the slide rail, an opening provided in the slide rail, and a pull-out plate mechanism 920 provided in the opening, which includes a drive mechanism and a baffle, and the drive mechanism can drive the baffle to slide or rotate to open or close the opening.

[0090] Plastic strips may contain transparent plastic strips of different materials with the same external shape. For example, PET plastic strips may contain transparent plastic strips such as PMMA and PC. Although the content of such impurities is very small, they can seriously affect the quality of PET. Therefore, in this embodiment, a near-infrared detector 910 is added to identify the material of the bottle body plastic strip to separate the target plastic strip and the non-target plastic strip. The target plastic strip is then transported to the packaging process. When the non-target plastic strip passes through the opening, the drive assembly is operated to open the opening and sift out the non-target plastic strip. After further sift-out of the material, the plastic strip product has a high purity and its economic value is greatly improved.

[0091] In the specific content of the above-mentioned embodiments for implementing the invention, the respective technical features can be arbitrarily combined unless they conflict. For the sake of simplicity, not all possible combinations of the above-mentioned technical features have been described, but unless they conflict, combinations of these technical features should be considered within the scope described in this specification.

[0092] It is apparent that the above examples of the present invention are merely listed to clearly explain the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art can make various other changes and modifications based on the above description. It is not possible or necessary to list all embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the claims of the present invention. [Explanation of symbols]

[0093] 100 First transport mechanism 110 Transport Unit 120 First eccentric wheel 130 Second eccentric wheel 140 Metal Detector 150 Vision Detector 160 Drawer plate / ejection assembly 200 Draft device 210 Draft Gap 220 First Draft Roller 230 Second active draft roller 240 First driven draft roller 250 Second driven draft roller 260 Notch 270 Feeding Hopper 300 Feed Roller Group 310 Driven Roller 320 driven roller 330 Feed gap 340 Hole 350 Lower Hopper 400 Slitting Device 410 Movable blade roller 411 Cut piece 420 Fixed blade plate 421 First Grid 422 Second Grid 423 Circular bottom part 430 Elastic retaining ring 500 Sieving Device 510 Second transport mechanism 511 Transport Unit 512 Third eccentric wheel 513 Fourth Eccentric Wheel 520 First Vibration Plate 521 First Vibrating Sieve 522 Second vibrating sieve 530 Blower 540 Suction device 600 Cleaning Equipment 610 Transport Assembly 611 Transport Chain 612 Cleaning Frame 630 Cleaning Assembly 631 Rough cleaning tank 632 First combined cleaning tank 633 Second combined cleaning tank 634 Washing machine tub 635 Fresh water tank 640 Drop Assembly 641 Drain pan 650 First Collision Assembly 651 First Drive Material 652 First mounting plate 653 First Collision Pillar 660 Second Collision Assembly 661 Second Drive Material 662 Second mounting plate 663 Second Collision Pillar 670 Abrasive material supply device 671 Power plant 672 Water Inlet 673 Outlet pipe 680 Water circulation equipment 681 Membrane Filter 682 Water Inlet 683 Fresh liquid outlet 684 Dirty fluid outlet 700 Drying equipment 710 Centrifugal drive mechanism 720 Inner Screen 730 cases 740 Lifting Cylinder 750 Water outlet 760 Outlet 800 Divider 810 First partition 820 Second partition 900 Third transport mechanism 910 Near-infrared detector 920 Drawer plate mechanism

Claims

1. A composite treatment process for waste plastic bottles, Step S10: supplying waste plastic bottles, transporting the waste plastic bottles using a first transport mechanism (100), and adjusting the axial direction of the waste plastic bottles to a first direction, which is approximately the same as the transport direction of the first transport mechanism (100), and identifying and sorting the waste plastic bottles after the direction adjustment to obtain target waste plastic bottles; Step S20: transporting the target waste plastic bottle to a draft device (200) and passing the target waste plastic bottle through a draft gap (210) of the draft device (200), thereby performing a first crushing, drafting, and stretching on the bottle body of the target waste plastic bottle; Step S30: transporting the target waste plastic bottle after drafting and flattening to a feed roller group (300), the outer periphery of which is provided with several recesses (340) through which the cap can pass, performing a second crushing on the bottle body of the target waste plastic bottle through the feed gap (330) of the feed roller group (300), and passing the cap of the target waste plastic bottle through the recesses (340) of the feed roller group (300), and then transporting the target waste plastic bottle to a slitting device (400) by the feed roller group (300) to perform slitting, cutting the bottle body of the waste plastic bottle into plastic strips, and cutting the remaining part of the waste plastic bottle to obtain waste material, the length dimension of the plastic strips being greater than the width dimension of the waste material in any direction and / or the weight of the plastic strips being greater than the weight of the waste material, wherein the feed gap (330) is smaller than the draft gap (210); Step S40: transporting the plastic strip and waste material obtained in step S30 to a sieving device (500), removing the waste material by the sieving device (500), and obtaining a plastic strip; Step S50: transporting the plastic strips sieved in step S40 to a washing device (600) for washing; A composite processing process for waste plastic bottles, comprising: a step S60 of transferring the plastic strip washed in step S50 to a drying device (700) for drying, thereby obtaining a bottle body plastic strip.

2. In step S10, the step of identifying and sorting the waste plastic bottles after the orientation adjustment to obtain the target waste plastic bottles is as follows: a first identification step of performing metal detection on the discarded plastic bottles to obtain metal-containing objects and plastic objects; A second identification step of identifying the exterior label and external features of the plastic object to obtain target waste plastic bottles and non-target waste plastic bottles; The combined treatment process for waste plastic bottles according to claim 1, further comprising a sorting step for selectively removing the metal objects and non-target waste plastic bottles to obtain the target waste plastic bottles.

3. The draft device (200) includes two groups of draft rollers, and in step S20, the step of performing a first crushing, drafting, and stretching on the bottle body of the target plastic bottle to be discarded using the draft gap (210) of the draft device (200) is as follows: Controlling two groups of draft rollers of the draft device (200) and bringing them into contact with two opposing surfaces of the target waste plastic bottle, respectively, to generate a first friction force and a second friction force, respectively; The composite processing process for discarded plastic bottles described in claim 1, characterized in that it includes controlling the magnitude of the first frictional force and the second frictional force so that they are not equal, and performing a first crushing and drafting / stretching on the bottle body of the target discarded plastic bottle using two groups of draft rollers.

4. In step S30, the step of transporting the target waste plastic bottle that has completed drafting and expansion to the feed roller group (300) includes: First, the target waste plastic bottle after drafting and expansion is guided to both sides of the feed roller group (300) and transported; The composite processing process for waste plastic bottles as described in claim 1 further includes moving the target waste plastic bottles after drafting and stretching from both sides of the feed roller group (300) to the center of the feed roller group (300) by the feed roller group (300).

5. The remaining portion of the discarded plastic bottle includes a cap, a neck ring, and label paper, the cap is connected to the bottle body, the neck ring is fitted to the bottle body at the bottle neck position, and the label paper is provided on the outer periphery of the bottle body; In step S30, the slitting device (400) performs slitting to cut the bottle body of the waste plastic bottle into plastic strips, and cuts the remaining part of the waste plastic bottle to obtain waste material, Cutting the bottle body of the discarded plastic bottle into plastic strips; Cutting a cap of a waste plastic bottle to obtain a first plastic block; Cutting the neck ring of the waste plastic bottle to obtain a second plastic block; shearing the label paper to obtain label fragments; The composite processing process for waste plastic bottles described in claim 1, characterized in that the length dimension of the plastic strip is greater than the width dimension in any direction of the first plastic block and the second plastic block, and the weight of the plastic strip, the first plastic block and the second plastic block is greater than the weight of the label fragments.

6. Step S40 a step of conveying the plastic strip by a second conveying mechanism (510) and conveying the first plastic block, the second plastic block, and the label fragments by adjusting the axial direction of the plastic strip in a second direction, and conveying the plastic strip, the first plastic block, the second plastic block, and the label fragments along the second direction to a sieving device (500), wherein the second direction is approximately the same as the conveying direction of the second conveying mechanism (510); dropping and separating the first and second plastic blocks through a sieving device (500), sucking up and separating the label fragments, obtaining the plastic strip, and transporting the plastic strip from the sieving device (500) in a second direction; The combined treatment process for waste plastic bottles according to claim 5, characterized in that in step S50, the plastic strip is transported to the cleaning device (600) along a second direction.

7. 2. The process for comprehensively treating waste plastic bottles according to claim 1, further comprising the step of initially drying the plastic strip after the step of washing the plastic strip in step S50.

8. The step of cleaning the plastic strip as described above includes: Step S51: immersing the plastic strip in a cleaning solution to perform a first cleaning; Step S52: cleaning the plastic strip a second time using a cleaning method that combines ultrasonic cleaning and mechanical vibration cleaning; Step S53: washing the plastic strip a third time using a combination of hot alkali, abrasive circulation, and mechanical vibration, wherein the temperature of the hot alkali is 55°C to 80°C; The combined treatment process for waste plastic bottles according to claim 7, further comprising a step S54 of washing the plastic strip a fourth time with a washing liquid or fresh water.

9. After step S60, Conveying the bottle body plastic strip by a third conveying mechanism, and identifying the bottle body plastic strip to obtain a target plastic strip and a non-target plastic strip; A comprehensive treatment process for waste plastic bottles as described in any one of claims 1 to 8, characterized in that it includes a step of transporting the target plastic strip to a packaging process and sieving and collecting the non-target plastic strip.

10. A composite processing system for waste plastic bottles, The system includes a loading device, a first conveying mechanism (100), a drafting device (200), a group of feed rollers (300), a slitting device (400), a sieving device (500), a washing device (600), and a drying device (700), The loading device is located above the starting end of a first conveying mechanism (100), the first conveying mechanism (100) includes several conveying units (110) arranged side by side, the width dimension of each conveying unit (110) being larger than the width dimension of the waste plastic bottles and smaller than the height dimension of the waste plastic bottles, and the draft device (200) is located below the end of the first conveying mechanism (100); The draft device (200) includes a group of draft rollers that rotate relative to one another, and the group of draft rollers is provided with a draft gap (210) through which the target waste plastic bottles pass and which drafts and stretches the target waste plastic bottles; The feed roller group (300) is located below the draft device (200) and includes a driving roller (310) and a driven roller (320) that rotate relative to each other, the minimum pitch between the driving roller (310) and the driven roller (320) is a feed gap (330), which is smaller than the draft gap (210), and recesses (340) that can accommodate caps and bottlenecks are provided on both the outer circumferential surfaces of the driving roller (310) and the driven roller (320), and during the feeding process, the caps and bottlenecks of the waste plastic bottles are positioned within the recesses (340), while the bottle bodies are subjected to a second crushing via the feed gap (330), The slitting device (400) is located below the feed roller group (300), and includes several groups of cutters that can generate shearing force by relative rotation, and the shearing force cuts the bottle body of the target waste plastic bottle into plastic strips, and the cap, neck ring, and label paper are also shredded to obtain waste materials; The sieving device (500) includes a first vibrating plate (520), the starting end of which is located below the slit device (400), the output port of the first vibrating plate (520) is connected to the input end of the cleaning device (600), a hollowed-out structure capable of accommodating some of the fallen waste material is provided at the bottom of the first vibrating plate (520), and a suction device (540) is provided above the first vibrating plate (520) for sucking and sorting some of the waste material, The plastic strip at the output end of the cleaning device (600) is transferred to a drying device (700) for dehydration and drying.

11. A comprehensive processing system for waste plastic bottles as described in claim 10, characterized in that two of the transport units (110) form one transport unit group, a first eccentric wheel (120) is provided between adjacent transport unit groups, a second eccentric wheel (130) is provided between two transport units (110) of each transport unit group, the width of the transport unit group of each group is greater than twice the width of the waste plastic bottles and less than the height of the waste plastic bottles, and the second eccentric wheel (130) is located behind the first eccentric wheel (120) in the transport direction.

12. 11. The composite processing system for waste plastic bottles according to claim 10, characterized in that a metal detector (140) and a visual detector (150) are provided above each transport unit (110), a pull-out plate / discharge assembly (160) is connected to each of the transport units (110), and the metal detector (140), the visual detector (150), and the pull-out plate / discharge assembly (160) are all connected to a controller.

13. The drafting device (200) includes a first driven draft roller (220), a second driven draft roller (230), a first driven draft roller (240), and a second driven draft roller (250), the first driven draft roller (220) and the first driven draft roller (240) are arranged side by side in the vertical direction and the first driven draft roller (220) and the first driven draft roller (240) are differentially driven connected, the second driven draft roller (230) and the second driven draft roller (250) are arranged side by side in the vertical direction and the second driven draft roller (230) and the second driven draft roller (250) are differentially driven connected.

11. The composite processing system for waste plastic bottles according to claim 10, characterized in that the first driven draft roller (220) and the second driven draft roller (250) are differentially driven, the first driven draft roller (220) and the second driven draft roller (250) are arranged side by side in the horizontal direction, and a draft gap (210) is provided between the first driven draft roller (220) and the second driven draft roller (250), and the second driven draft roller (230) and the first driven draft roller (240) are arranged side by side in the horizontal direction, and a draft gap (210) is also provided between the second driven draft roller (230) and the first driven draft roller (240).

14. A composite processing system for waste plastic bottles as described in claim 10, characterized in that a partition plate (800) is provided between the draft device (200) and the group of feed rollers (300), a first partition section (810) for branching the target waste plastic bottles is provided at the top of the partition plate (800), and a second partition section (820) for merging the target waste plastic bottles is provided at the bottom of the partition plate (800), the first partition section (810) is located directly below the draft gap (210), and the second partition section (820) is located directly above the feed gap (330).

15. The slitting device (400) comprises a movable blade roller (410), a fixed blade plate (420), and an elastic retaining ring (430), the movable blade roller (410) comprises several cutting pieces (411) arranged in parallel at equal intervals and provided with movable blade cutting portions, the cutting pieces (411), the elastic retaining ring (430) and the movable blade roller (410) are arranged in parallel in the horizontal direction, and the elastic retaining ring (430) rotates opposite to the movable blade roller (410) at the same rotation speed, and the fixed blade plate (420) 11. A composite processing system for waste plastic bottles as described in claim 10, characterized in that the grid (420) has alternatingly arranged first and second grids (421) and (422), the inner edge of the first grid (421) is provided with a fixed blade section that cooperates with a movable blade section to generate slit shear stress, and multiple groups of the elastic retaining rings (430) are capable of passing through the second grid (422) and are pushed out to contact the surface of the target waste plastic bottles at multiple points.

16. The composite processing system for waste plastic bottles described in claim 15, characterized in that the spacing between adjacent cut pieces (411) is greater than half the diameter of the cap and less than the diameter of the cap, and the spacing between adjacent cut pieces (411) is greater than 1 / 4 of the width of the target waste plastic bottle and less than 1 / 3 of the width of the target waste plastic bottle.

17. The sieving device (500) further includes a second conveying mechanism (510), the starting end of which is located below the slit device (400), and the articles at the end of the second conveying mechanism (510) can fall into the input port of the first vibration plate (520). The second conveying mechanism (510) includes several transport units (511) arranged in parallel, and the width dimension of each transport unit (511) is larger than the width dimension of the plastic strip and smaller than the length dimension of the plastic strip.

11. The waste plastic bottle composite processing system of claim 10, wherein one transport unit group is formed by three transport units (511) each, the width of the transport unit group of each group being greater than twice the width of the plastic strip and less than the length of the plastic strip, a third eccentric wheel (512) is provided between adjacent transport unit groups, and a fourth eccentric wheel (513) is provided between two transport units (511) of each transport unit group, the fourth eccentric wheel (513) being located behind the third eccentric wheel (512) in the transport direction.

18. The first vibrating plate (520) includes a first vibrating sieve (521) and a second vibrating sieve (522) distributed vertically, the first vibrating sieve (521) is located above the second vibrating sieve (522), and a hole is provided at the bottom of the first vibrating sieve (521) to accommodate some of the waste material that falls, a suction device (540) is provided at the top of the first vibrating sieve (521), and a blower device (530) is provided at the bottom of the second vibrating sieve (522), and the suction device (540) works in cooperation with the blower device (530) to remove other waste material that cannot fall through the hole.

19. The cleaning device (600) includes a transport assembly (610) having a plurality of cleaning frames (612), a cleaning assembly (630), and a drip assembly (640), the top of which is open and used to receive plastic strips from the sieving device (500), and the transport assembly (610) transports the plastic strips sequentially to the cleaning assembly (630) for cleaning and to the drip assembly (640) for initial drying, and the plastic strips in the cleaning frames (612) that have completed cleaning and initial drying are transported to the drying device (700).

20. The cleaning assembly (630) includes a rough cleaning tank (631), a first combined cleaning tank (632), a second combined cleaning tank (633), a washing tank (634), and a clean water tank (635) that are arranged in this order. In both the first combined cleaning tank (632) and the second combined cleaning tank (633), a first collision post (653) and a second collision post (663) that can be positioned above and below the cleaning frame (612), respectively, are provided. The first collision post (653) and the second collision post (663) are provided with a first driving member (651) and a second driving member, respectively.

20. The composite processing system for waste plastic bottles as described in claim 19, characterized in that: (661) is connected to the cleaning frame (612); passages are provided at both the top and bottom of the cleaning frame (612) to accommodate the first collision post (653) and the second collision post (663) to enter and collide with the plastic strip; an ultrasonic cleaner is further provided within the first composite cleaning tank (632); and an abrasive supply device (670) capable of transporting abrasives into the cleaning frame (612) is further connected to the second composite cleaning tank (633).

21. A comprehensive processing system for waste plastic bottles as described in any one of claims 10 to 20, characterized in that the drying device (700) is provided with an outlet (760), the outlet (760) is provided with a third conveying mechanism (900) for conveying the bottle body plastic strip to a packaging process, an infrared detector (910) is provided above the third conveying mechanism (900), a discharge outlet is opened in the third conveying mechanism (900), a pull-out plate mechanism (920) is provided at the discharge outlet, and the near-infrared detector (910) and the pull-out plate mechanism (920) are both connected to a controller.

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