Plastic recycling method

Abstract

The present invention relates to the technical field of plastic recycling and utilization, and discloses a plastic recycling and utilization method, comprising: marking collected plastic bottles as Class I plastic bottles; performing a first film removal process on the plastic films of the Class I plastic bottles; after the first film removal process, if the plastic films of the Class I plastic bottles are not completely removed, manually removing the plastic films from the Class I plastic bottles where the plastic films are not completely removed; marking the Class I plastic bottles after the plastic films are removed as Class II plastic bottles; if there are contents in the Class II plastic bottles, marking the Class II plastic bottles as abnormal plastic bottles; judging the type of the contents in the abnormal plastic bottles; formulating a removal strategy according to the type of the contents in the abnormal plastic bottles; crushing the abnormal plastic bottles and the Class II plastic bottles for which the removal strategy has been completed to form plastic sheets; cleaning, collecting and drying the plastic sheets; this scheme ensures the purity of the plastic sheets and improves the quality of the recycled materials.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic recycling, in particular to a plastic recycling method. Background Art

[0002] With the development of social economy and the improvement of people's living standards, plastic products have been widely used in daily life due to their advantages such as lightness, durability and low cost, and the consumption of plastics has increased sharply. However, this is accompanied by the increasingly serious problem of plastic pollution, especially polyethylene terephthalate (PET) bottles. Discarded PET bottles are not easy to degrade in the natural environment. During the degradation period, they will gradually break into tiny particles and enter the soil, water sources and even the food chain. If these PET bottles are not properly handled, they will pose a great threat to the ecological environment. Therefore, a practical and efficient plastic recycling method is very important.

[0003] Early PET plastic bottle recycling mainly relied on manual sorting and simple cleaning processes. The plastic film on the plastic bottles was only removed and cleaned without cutting the plastic bottles. This was very unfavorable for subsequent reuse. In addition, due to the immature technology, the recycling rate was low, and the efficiency of cleaning and label removal was limited, resulting in many bottles containing residues being unable to be recycled.

[0004] Traditional PET plastic bottle recycling technology uses an assembly line to remove the film, cut, crush and clean the plastic bottles, breaking the plastic bottles into plastic sheets. However, during the cutting process, plastic bottles with contents still need to be manually handled. If the contents are not completely removed before cutting, the cutting process of the plastic bottles will be greatly affected, and the cutting equipment may be damaged, affecting the overall recycling.

[0005] Existing PET plastic bottle recycling technology can achieve simple automatic removal of the contents of plastic bottles, but it cannot implement different removal strategies based on the type of contents and cannot effectively remove the contents of plastic bottles. Therefore, for certain types of contents, the removal efficiency is low, increasing the recycling workload. Summary of the Invention

[0006] The present invention provides a plastic recycling method for promoting the solution of the problems mentioned in the above background technology.

[0007] The present invention provides the following technical solution: Optionally, a plastic recycling method is characterized by comprising:

[0008] The collected plastic bottles are recorded as a type of plastic bottles;

[0009] The plastic film of a type of plastic bottle is subjected to a first de-filming process;

[0010] The plastic film includes labels and packaging films;

[0011] After the first de-membrane treatment;

[0012] If the plastic film of a type of plastic bottle is not completely removed, the plastic film of the type of plastic bottle is removed manually;

[0013] Class 1 plastic bottles after the plastic film is removed are recorded as Class 2 plastic bottles;

[0014] If there is no content in the second-class plastic bottle, the second-class plastic bottle is crushed to form plastic flakes;

[0015] If there is content in the second-class plastic bottle, the second-class plastic bottle will be marked as an abnormal plastic bottle;

[0016] Targeting abnormal plastic bottles;

[0017] Determine the type of contents in abnormal plastic bottles;

[0018] Develop a removal strategy based on the type of contents in the abnormal plastic bottle;

[0019] The abnormal plastic bottles that have completed the removal strategy are crushed into plastic flakes;

[0020] The plastic sheets are cleaned and collected;

[0021] The cleaned plastic sheets are dried.

[0022] Optionally, the determination of the type of the contents in the abnormal plastic bottle is specifically as follows:

[0023] Multiple pressure sensors are set at the contact position between the clamping device and the abnormal plastic bottle, and the distance between two adjacent pressure sensors is the same;

[0024] Get the number of pressure sensors, which is recorded as N;

[0025] Pick up abnormal plastic bottles;

[0026] Rotate the abnormal plastic bottle so that the clamped abnormal plastic bottle is in a horizontal state;

[0027] Name the N pressure sensors, according to their distance from the mouth of the abnormal plastic bottle, the first pressure sensor, the second pressure sensor, the third pressure sensor, and so on, the Nth pressure sensor.

[0028] The pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as A1, A2, A3, ... A N ;

[0029] Set threshold Z1 and threshold Z2;

[0030] Turn the abnormal plastic bottle clockwise;

[0031] When the clockwise rotation angle is equal to 90 degrees and the mouth of the abnormal plastic bottle is located directly below the bottom of the abnormal plastic bottle, stop the clockwise rotation;

[0032] Rotate the abnormal plastic bottle counterclockwise at a constant speed of 180 degrees per second;

[0033] When the counterclockwise rotation angle reaches 90 degrees and the abnormal plastic bottle is completely reset, stop rotating;

[0034] The moment when the abnormal plastic bottle is reset is recorded as time 0, and time T and time Q are set, Q>T;

[0035] Obtain pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T, respectively;

[0036] At time Q, the pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as B1, B2, B3, ... B N ;

[0037] Obtain the absolute values ​​|B1-A1|, |B2-A2|, |B3-A3|, ... |B N -A N |;

[0038] The type of the contents in the abnormal plastic bottle is determined based on the obtained pressure value.

[0039] Optionally, the determining the type of the contents in the abnormal plastic bottle further includes:

[0040] Set the pressure value threshold Z1 and the numerical value threshold Z2;

[0041] Calculate A1, A2, A3, ... A N The average value of

[0042] Calculate A1, A2, A3, ... A respectively N the square of the difference from the mean;

[0043] Get the average of all squares, and record the average of the squares as A;

[0044] If the pressure value of the pressure sensor at time 0 ≠ (1÷4)T, the pressure value at time (1÷4)T ≠ (2÷4)T, the pressure value at time (2÷4)T ≠ (3÷4)T, and the pressure value at time (3÷4)T ≠ T, the changes in the pressure values ​​of the pressure sensor at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are recorded as one type of change;

[0045] If the pressure value of the pressure sensor at time 0 = (1÷4)T, the pressure value at time (1÷4)T = the pressure value at time (2÷4)T, the pressure value at time (2÷4)T = the pressure value at time (3÷4)T, and the pressure value at time (3÷4)T = the pressure value at time T, the changes in the pressure values ​​of this pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as second-class changes;

[0046] If the pressure value change of the pressure sensor is neither a first-class change nor a second-class change, the pressure value changes of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as third-class changes;

[0047] If A1, A2, A3...A N All > Z1, absolute value |B1-A1|, |B2-A2|, |B3-A3|...|B N -A N | are all ≤ Z2 and A ≤ Z2, and the pressure value changes of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are all of the same type. The contents of the abnormal plastic bottle are recorded as belonging to the first type of contents and the first removal strategy is implemented;

[0048] If A1, A2, A3...A N If there is a pressure value greater than Z1 and A greater than Z2, the pressure sensor with a pressure value greater than Z1 is recorded as an abnormal pressure sensor. If among all abnormal pressure sensors, there is a pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class II changes, and there is no abnormal pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class III changes, the contents in the abnormal plastic bottle are recorded as Class II contents and the second removal strategy is implemented.

[0049] If among all abnormal pressure sensors, there are pressure sensors whose pressure values ​​at time 0, (1÷4)T, (2÷4)T, (3÷4)T and T change as Class II changes, the contents in the abnormal plastic bottle are recorded as Class III contents and the third removal strategy is executed.

[0050] Optionally, the contents in the abnormal plastic bottle are recorded as a type of contents and a first removal strategy is executed, specifically:

[0051] Get the bottle mouth position of the abnormal plastic bottle;

[0052] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0053] Grab the abnormal plastic bottle at the gripping position;

[0054] If the abnormal plastic bottle does not have a bottle cap;

[0055] Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle;

[0056] Remove the contents of the abnormal plastic bottle through the mouth of the abnormal plastic bottle;

[0057] If the abnormal plastic bottle has a bottle cap;

[0058] Cut off the bottom of the abnormal plastic bottle;

[0059] Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle;

[0060] Remove the contents of the abnormal plastic bottle through the bottom of the abnormal plastic bottle;

[0061] When a type of content does not exist in the abnormal plastic bottle;

[0062] Stop gripping and release the abnormal plastic bottle;

[0063] Crush the released abnormal plastic bottles.

[0064] Optionally, the contents in the abnormal plastic bottle are recorded as Class II contents and a second removal strategy is implemented, specifically:

[0065] Get the bottle mouth position of the abnormal plastic bottle;

[0066] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0067] Grab the abnormal plastic bottle at the gripping position;

[0068] If the abnormal plastic bottle has a bottle cap;

[0069] Then remove the caps of abnormal plastic bottles;

[0070] When the abnormal plastic bottle does not have a cap;

[0071] Cut off the bottom of the abnormal plastic bottle;

[0072] Introduce gas into the abnormal plastic bottle through the mouth of the abnormal plastic bottle;

[0073] The second-class contents in the abnormal plastic bottle are driven by gas, and the second-class contents in the abnormal plastic bottle are taken out of the abnormal plastic bottle and removed;

[0074] When there is no Category II content in the abnormal plastic bottle;

[0075] Stop gripping and release the abnormal plastic bottle;

[0076] Crush the released abnormal plastic bottles.

[0077] Optionally, the contents in the abnormal plastic bottle are recorded as three types of contents and a third removal strategy is implemented, specifically:

[0078] Get the bottle mouth position of the abnormal plastic bottle;

[0079] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0080] Grab the abnormal plastic bottle at the gripping position;

[0081] If the abnormal plastic bottle has a bottle cap;

[0082] Then remove the caps of abnormal plastic bottles;

[0083] When the abnormal plastic bottle does not have a cap;

[0084] Remove the bottom of abnormal plastic bottles;

[0085] Introduce gas into the abnormal plastic bottle through the mouth of the abnormal plastic bottle;

[0086] If gas is introduced into the abnormal plastic bottle;

[0087] The three types of contents in the abnormal plastic bottle were not completely removed;

[0088] Increase the pressure of the gas introduced;

[0089] Set the time T and air pressure threshold P;

[0090] When the pressure of the gas introduced is equal to the pressure threshold P and the time of gas introduction is equal to T;

[0091] The three types of contents in the abnormal plastic bottle were not completely removed;

[0092] Stop the gas supply;

[0093] Clip the three types of contents from the bottom of the abnormal plastic bottle, take them out and remove them;

[0094] When the three types of contents no longer exist in the abnormal plastic bottle;

[0095] Stop picking up abnormal plastic bottles;

[0096] Crush the released abnormal plastic bottles.

[0097] Optionally, the plastic sheets are cleaned and collected, specifically by:

[0098] Crushing Class II plastic and abnormal plastic bottles into plastic flakes;

[0099] The plastic sheets are sent to the No. 1 water tank for cleaning;

[0100] Set the water temperature in pool 1 to 70 degrees Celsius;

[0101] Plastic flakes collected in Pool 1 after washing;

[0102] The plastic sheets are sent to the No. 1 water tank for cleaning;

[0103] Set the water temperature in pool 1 to 20 degrees Celsius;

[0104] Plastic pieces collected on the surface of Pool No. 2.

[0105] The present invention has the following beneficial effects:

[0106] 1. This plastic recycling method can significantly improve recycling efficiency through a step-by-step processing process. First, the plastic bottles are subjected to an initial film removal process to ensure that most labels and packaging films are removed, thereby reducing the burden of subsequent processing. Second, manual film removal is supplemented to ensure that residual plastic film can still be effectively removed even when automated processing is insufficient. This layered film removal process reduces the impact of plastic film on subsequent cleaning and crushing steps, making the final plastic sheets purer and improving the quality of recycled materials.

[0107] 2. The plastic recycling method determines whether there are contents in the plastic bottles after removing the membranes and before crushing the plastic bottles. Plastic bottles without contents are directly crushed. Plastic bottles with contents are firstly removed. After ensuring that the contents are completely removed, the plastic bottles are crushed to ensure that the crushing equipment is not affected by the contents during the crushing process, thereby improving the recycling efficiency.

[0108] 3. This plastic recycling method, by setting up a pressure sensor, obtains the position change of the contents of the plastic bottle during the rotation of the abnormal plastic bottle, and then determines the type of the contents. This method enables the recycling process to accurately identify the type of plastic bottle contents, such as liquid, solid or mixture, ensuring the efficiency and accuracy of removing the contents, thereby improving the overall operational efficiency.

[0109] 4. This plastic recycling method implements different removal strategies for different types of contents. On the premise of ensuring the complete removal of the contents, the removal operation is made more targeted, avoiding unnecessary waste of resources, reducing the overall removal cost, and also reducing the losses caused by improper removal.

[0110] 5. This plastic recycling method sets the water temperature in pool 1 at 70 degrees Celsius. High-temperature cleaning can effectively remove grease, tape residue, and other difficult-to-clean contaminants on the surface of plastic sheets, thereby improving the cleaning effect. Further cleaning with low-temperature water at 20 degrees Celsius helps remove residual impurities, ensure the purity of the plastic sheets, and improve the quality of the recycled materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0111] Figure 1 A schematic diagram of a type of content.

[0112] Figure 2 This is a schematic diagram of the second category of contents.

[0113] Figure 3 Schematic diagram of three types of contents. DETAILED DESCRIPTION

[0114] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0115] Embodiment 1, a plastic recycling method, characterized by comprising:

[0116] The collected plastic bottles are recorded as a type of plastic bottles;

[0117] The plastic film of a type of plastic bottle is subjected to a first de-filming process;

[0118] The plastic film includes labels and packaging films;

[0119] After the first de-membrane treatment;

[0120] If the plastic film of a type of plastic bottle is not completely removed, the plastic film of the type of plastic bottle is removed manually;

[0121] Class 1 plastic bottles after the plastic film is removed are recorded as Class 2 plastic bottles;

[0122] If there is no content in the second-class plastic bottle, the second-class plastic bottle is crushed to form plastic flakes;

[0123] If there is content in the second-class plastic bottle, the second-class plastic bottle will be marked as an abnormal plastic bottle;

[0124] Targeting abnormal plastic bottles;

[0125] Determine the type of contents in abnormal plastic bottles;

[0126] Develop a removal strategy based on the type of contents in the abnormal plastic bottle;

[0127] The abnormal plastic bottles that have completed the removal strategy are crushed into plastic flakes;

[0128] The plastic sheets are cleaned and collected;

[0129] Drying the cleaned plastic sheets;

[0130] The step-by-step process significantly improves recycling efficiency. First, the bottles are de-filmed for the first time to ensure that most labels and packaging films are removed, thereby reducing the burden of subsequent processing. Second, manual de-filming is supplemented to ensure that even when automated processing is insufficient, residual plastic film can still be effectively removed. This layered de-filming process reduces the impact of plastic film on subsequent cleaning and crushing steps, making the final plastic sheets purer and improving the quality of recycled materials.

[0131] The method of determining the type of contents in the abnormal plastic bottle is as follows:

[0132] Reference Figure 1 , multiple pressure sensors are set at the contact position between the clamping device and the abnormal plastic bottle, and the distance between two adjacent pressure sensors is the same;

[0133] Get the number of pressure sensors, which is recorded as N;

[0134] Pick up abnormal plastic bottles;

[0135] Turn the abnormal plastic bottle so that the clamped abnormal plastic bottle is in a horizontal state, ensuring that the contents of the abnormal plastic bottle remain stationary in the abnormal plastic bottle;

[0136] Name the N pressure sensors, according to their distance from the mouth of the abnormal plastic bottle, the first pressure sensor, the second pressure sensor, the third pressure sensor, and so on, the Nth pressure sensor.

[0137] The pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as A1, A2, A3, ... A N ;

[0138] Turn the abnormal plastic bottle clockwise;

[0139] When the clockwise rotation angle is equal to 90 degrees and the mouth of the abnormal plastic bottle is located directly below the bottom of the abnormal plastic bottle, stop the clockwise rotation;

[0140] The abnormal plastic bottle is rotated counterclockwise at a constant speed of 180 degrees per second, and the abnormal plastic bottle is rotated at a faster speed to complete the reset of the abnormal plastic bottle, so that the movable contents in the abnormal plastic bottle continue to move after the abnormal plastic bottle completes the reset, causing the pressure values ​​of each pressure sensor to change continuously, and the type of the contents is determined according to the type of change;

[0141] When the counterclockwise rotation angle reaches 90 degrees and the abnormal plastic bottle is completely reset, stop rotating;

[0142] The moment when the abnormal plastic bottle completes its reset is recorded as time 0, and time T and time Q are set. At time T, the contents in the abnormal plastic bottle are not completely still. At time Q, the contents in the abnormal plastic bottle are completely still. Q>T;

[0143] Obtain pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T, respectively;

[0144] At time Q, the pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as B1, B2, B3, ... B N ;

[0145] Obtain the absolute values ​​|B1-A1|, |B2-A2|, |B3-A3|, ... |B N -A N|, absolute value |B1-A1|, |B2-A2|, |B3-A3|...|B N -A N |The function is to determine whether the pressure value of each pressure sensor changes after two rotations. If the pressure value is small, there is no change; if the pressure value is large, there is a change;

[0146] The type of the contents in the abnormal plastic bottle is determined based on the obtained pressure value.

[0147] The method of determining the type of the contents of the abnormal plastic bottle further includes:

[0148] Set the pressure value threshold Z1 and the numerical threshold Z2. The function of the threshold Z1 is to judge whether there is content. When the abnormal plastic bottle is in a horizontal state, the pressure value generated by the weight of the abnormal plastic bottle is Z1. When the pressure value is greater than Z1, it means that there is content in the abnormal plastic bottle. The function of the threshold Z2 is to judge whether the pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor...the Nth pressure sensor are roughly equal. When the pressure values ​​A1, A2, A3...A N With A1, A2, A3...A N When the average of the squares of the differences in the average values ​​is less than or equal to Z2, A1, A2, A3...A N Roughly equal; when pressure values ​​A1, A2, A3...A N With A1, A2, A3...A N When the average of the squares of the differences between the averages is greater than Z2, A1, A2, A3...A N Not all are equal;

[0149] Calculate A1, A2, A3, ... A N The average value of

[0150] Calculate A1, A2, A3, ... A respectively N the square of the difference from the mean;

[0151] Get the average of all squares, and record the average of the squares as A;

[0152] If the pressure value of the pressure sensor at time 0 ≠ time (1÷4)T, the pressure value at time (1÷4)T ≠ the pressure value at time (2÷4)T, the pressure value at time (2÷4)T ≠ the pressure value at time (3÷4)T, and the pressure value at time (3÷4)T ≠ the pressure value at time T, it means that the pressure values ​​of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are constantly changing; the changes in the pressure values ​​of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as one type of change;

[0153] If the pressure value of the pressure sensor at time 0 = (1÷4)T, the pressure value at time (1÷4)T = the pressure value at time (2÷4)T, the pressure value at time (2÷4)T = the pressure value at time (3÷4)T, and the pressure value at time (3÷4)T = the pressure value at time T, it means that the pressure values ​​of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T have not changed. The changes in the pressure values ​​of this pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as second-class changes.

[0154] If the pressure value change of the pressure sensor is neither a first-class change nor a second-class change, the pressure value changes of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as third-class changes;

[0155] If A1, A2, A3...A N All > Z1, absolute value |B1-A1|, |B2-A2|, |B3-A3|...|B N -A N | are all ≤ Z2 and A ≤ Z2, and the pressure value changes of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are all of the same type, indicating that the contents are only liquid. The contents of the abnormal plastic bottle are recorded as type I contents and the first removal strategy is implemented;

[0156] If A1, A2, A3...A N If there is a pressure value greater than Z1 and A greater than Z2, the pressure sensor with a pressure value greater than Z1 is recorded as an abnormal pressure sensor. If among all abnormal pressure sensors, there is a pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class II changes, and there is no abnormal pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class III changes, it means that the contents contain solids but all solids are movable and not adhered to the abnormal plastic bottle. The contents in the abnormal plastic bottle are recorded as Class II contents and the second removal strategy is implemented.

[0157] If among all abnormal pressure sensors, there is a pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are of the second type, the contents in the abnormal plastic bottle are recorded as the third type and the third removal strategy is implemented;

[0158] By setting up a pressure sensor, the position change of the contents of the plastic bottle during the rotation of the abnormal plastic bottle can be obtained, and the type of the contents can be determined. This method enables the recycling process to accurately identify the type of plastic bottle contents, such as liquid, solid or mixture, ensuring the efficiency and accuracy of removing the contents, thereby improving overall operational efficiency.

[0159] The contents of the abnormal plastic bottle are recorded as a type of contents and the first removal strategy is executed, specifically:

[0160] Get the bottle mouth position of the abnormal plastic bottle;

[0161] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0162] Grab the abnormal plastic bottle at the gripping position;

[0163] If the abnormal plastic bottle does not have a bottle cap;

[0164] Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle;

[0165] Remove the contents of the abnormal plastic bottle through the mouth of the abnormal plastic bottle;

[0166] If the abnormal plastic bottle has a bottle cap;

[0167] Cut off the bottom of the abnormal plastic bottle;

[0168] Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle;

[0169] Remove one type of content from the abnormal plastic bottle through the bottom of the abnormal plastic bottle. If the other type of content is liquid, just turn the abnormal plastic bottle to make it flow out.

[0170] When a type of content does not exist in the abnormal plastic bottle;

[0171] Stop gripping and release the abnormal plastic bottle;

[0172] Crush the released abnormal plastic bottles.

[0173] The contents of the abnormal plastic bottle are recorded as Class II contents and the second removal strategy is implemented, specifically:

[0174] Get the bottle mouth position of the abnormal plastic bottle;

[0175] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0176] Grab the abnormal plastic bottle at the gripping position;

[0177] If the abnormal plastic bottle has a bottle cap;

[0178] Then remove the caps of abnormal plastic bottles;

[0179] When the abnormal plastic bottle does not have a cap;

[0180] Cut off the bottom of the abnormal plastic bottle;

[0181] Gas is introduced into the abnormal plastic bottle through its mouth. The second-class contents contain movable solids, which can be taken out by high-pressure gas.

[0182] The second-class contents in the abnormal plastic bottle are driven by gas, and the second-class contents in the abnormal plastic bottle are taken out of the abnormal plastic bottle and removed;

[0183] When there is no Category II content in the abnormal plastic bottle;

[0184] Stop gripping and release the abnormal plastic bottle;

[0185] Crush the released abnormal plastic bottles.

[0186] The contents of the abnormal plastic bottles are recorded as three types of contents and the third removal strategy is implemented, specifically:

[0187] Get the bottle mouth position of the abnormal plastic bottle;

[0188] The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position;

[0189] Grab the abnormal plastic bottle at the gripping position;

[0190] If the abnormal plastic bottle has a bottle cap;

[0191] Then remove the caps of abnormal plastic bottles;

[0192] When the abnormal plastic bottle does not have a cap;

[0193] Remove the bottom of abnormal plastic bottles;

[0194] Introduce gas into the abnormal plastic bottle through the mouth of the abnormal plastic bottle;

[0195] If gas is introduced into the abnormal plastic bottle;

[0196] The three types of contents in the abnormal plastic bottle were not completely removed;

[0197] Increase the pressure of the gas introduced;

[0198] Set the time T and air pressure threshold P;

[0199] When the pressure of the gas introduced is equal to the pressure threshold P and the time of gas introduction is equal to T;

[0200] If the three types of contents in the abnormal plastic bottle have not been completely removed, it means that the contents are stuck in the abnormal plastic bottle or cannot be moved and need to be removed;

[0201] Stop the gas supply;

[0202] Clip the three types of contents from the bottom of the abnormal plastic bottle, take them out and remove them;

[0203] When the three types of contents no longer exist in the abnormal plastic bottle;

[0204] Stop picking up abnormal plastic bottles;

[0205] Crush the released abnormal plastic bottles;

[0206] Different removal strategies are implemented for different types of contents. While ensuring that the contents are completely removed, the removal operation is made more targeted, avoiding unnecessary waste of resources, reducing overall removal costs, and also reducing losses caused by improper removal.

[0207] The plastic sheets are cleaned and collected, specifically:

[0208] Crushing Class II plastic and abnormal plastic bottles into plastic flakes;

[0209] The plastic sheets are sent to the No. 1 water tank for cleaning;

[0210] Set the water temperature in pool 1 to 70 degrees Celsius;

[0211] Plastic flakes collected in Pool 1 after washing;

[0212] The plastic sheets are sent to the No. 1 water tank for cleaning. By setting the water temperature in the No. 1 water tank to 70 degrees Celsius, high-temperature cleaning can effectively remove grease, tape residue, and other difficult-to-clean contaminants on the surface of the plastic sheets, thereby improving the cleaning effect.

[0213] Set the water temperature in pool 1 to 20 degrees Celsius;

[0214] The plastic flakes collected on the surface of Pool No. 2 are further cleaned in low-temperature water at 20 degrees Celsius, which helps remove residual impurities, ensure the purity of the plastic flakes, and improve the quality of the recycled materials.

[0215] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0216] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A plastic recycling method, characterized in that: include, The collected plastic bottles are recorded as a type of plastic bottles; The plastic film of a type of plastic bottle is subjected to a first de-filming process; The plastic film includes labels and packaging films; After the first de-membrane treatment; If the plastic film of a type of plastic bottle is not completely removed, the plastic film of the type of plastic bottle is removed manually; Class 1 plastic bottles after the plastic film is removed are recorded as Class 2 plastic bottles; If there is no content in the second-class plastic bottle, the second-class plastic bottle is crushed to form plastic flakes; If there is content in the second-class plastic bottle, the second-class plastic bottle will be marked as an abnormal plastic bottle; Targeting abnormal plastic bottles; Determine the type of contents in abnormal plastic bottles; Multiple pressure sensors are set at the contact position between the clamping device and the abnormal plastic bottle, and the distance between two adjacent pressure sensors is the same; Get the number of pressure sensors, which is recorded as N; Pick up abnormal plastic bottles; Rotate the abnormal plastic bottle so that the clamped abnormal plastic bottle is in a horizontal state; Name the N pressure sensors, according to their distance from the mouth of the abnormal plastic bottle, the first pressure sensor, the second pressure sensor, the third pressure sensor, and so on, the Nth pressure sensor. The pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as A1, A2, A3, ... A N ; Set threshold Z1 and threshold Z2; Turn the abnormal plastic bottle clockwise; When the clockwise rotation angle is equal to 90 degrees and the mouth of the abnormal plastic bottle is located directly below the bottom of the abnormal plastic bottle, stop the clockwise rotation; Rotate the abnormal plastic bottle counterclockwise at a constant speed of 180 degrees per second; When the counterclockwise rotation angle reaches 90 degrees and the abnormal plastic bottle is completely reset, stop rotating; The moment when the abnormal plastic bottle is reset is recorded as time 0, and time T and time Q are set, Q>T; Obtain the pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T respectively; At time Q, the pressure values ​​of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor are obtained respectively and recorded as B1, B2, B3, ... B N ; Obtain the absolute values ​​|B1-A1|, |B2-A2|, |B3-A3|, ... |B N -A N |; Determine the type of the contents in the abnormal plastic bottle based on the obtained pressure value; Develop a removal strategy based on the type of contents in the abnormal plastic bottle; The abnormal plastic bottles that have completed the removal strategy are crushed into plastic flakes; The plastic sheets are cleaned and collected; The cleaned plastic sheets are dried.

2. A plastic recycling method according to claim 1, characterized in that: The method of determining the type of the contents of the abnormal plastic bottle further includes: Set the pressure value threshold Z1 and the numerical value threshold Z2; Calculate A1, A2, A3, ... A N The average value of Calculate A1, A2, A3, ... A respectively N the square of the difference from the mean; Get the average of all squares, and record the average of the squares as A; If the pressure value of the pressure sensor at time 0 ≠ (1÷4)T, the pressure value at time (1÷4)T ≠ (2÷4)T, the pressure value at time (2÷4)T ≠ (3÷4)T, and the pressure value at time (3÷4)T ≠ T, the changes in the pressure values ​​of the pressure sensor at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are recorded as one type of change; If the pressure value of the pressure sensor at time 0 = (1÷4)T, the pressure value at time (1÷4)T = the pressure value at time (2÷4)T, the pressure value at time (2÷4)T = the pressure value at time (3÷4)T, and the pressure value at time (3÷4)T = the pressure value at time T, the changes in the pressure values ​​of this pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as second-class changes; If the pressure value change of the pressure sensor is neither a first-class change nor a second-class change, the pressure value changes of the pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are recorded as third-class changes; If A1, A2, A3...A N All > Z1, absolute value |B1-A1|, |B2-A2|, |B3-A3|...|B N -A N | are all ≤ Z2 and A ≤ Z2, and the pressure value changes of the first pressure sensor, the second pressure sensor, the third pressure sensor, ... the Nth pressure sensor at time 0, time (1÷4)T, time (2÷4)T, time (3÷4)T, and time T are all of the same type. The contents of the abnormal plastic bottle are recorded as the first type of contents and the first removal strategy is implemented; If A1, A2, A3...A N If there is a pressure value greater than Z1 and A greater than Z2, the pressure sensor with a pressure value greater than Z1 is recorded as an abnormal pressure sensor. If among all abnormal pressure sensors, there is a pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class II changes, and there is no abnormal pressure sensor whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class III changes, the contents in the abnormal plastic bottle are recorded as Class II contents and the second removal strategy is implemented. If among all abnormal pressure sensors, there are pressure sensors whose pressure value changes at time 0, (1÷4)T, (2÷4)T, (3÷4)T, and T are Class II changes, the contents in the abnormal plastic bottle are recorded as Class III contents and the third removal strategy is executed.

3. A plastic recycling method according to claim 2, characterized in that: The contents of the abnormal plastic bottle are recorded as a type of contents and the first removal strategy is executed, specifically: Get the bottle mouth position of the abnormal plastic bottle; The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position; Grab the abnormal plastic bottle at the gripping position; If the abnormal plastic bottle does not have a bottle cap; Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle; Remove the contents of the abnormal plastic bottle through the mouth of the abnormal plastic bottle; If the abnormal plastic bottle has a bottle cap; Cut off the bottom of the abnormal plastic bottle; Rotate the abnormal plastic bottle so that it is in a vertical position, at which point the mouth of the abnormal plastic bottle is below the bottom of the abnormal plastic bottle; Remove the contents of the abnormal plastic bottle through the bottom of the abnormal plastic bottle; When a type of content does not exist in the abnormal plastic bottle; Stop gripping and release the abnormal plastic bottle; Crush the released abnormal plastic bottles.

4. A plastic recycling method according to claim 2, characterized in that: The contents of the abnormal plastic bottle are recorded as Class II contents and the second removal strategy is implemented, specifically: Get the bottle mouth position of the abnormal plastic bottle; The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position; Grab the abnormal plastic bottle at the gripping position; If the abnormal plastic bottle has a bottle cap; Then remove the caps of abnormal plastic bottles; When the abnormal plastic bottle does not have a cap; Cut off the bottom of the abnormal plastic bottle; Introduce gas into the abnormal plastic bottle through the mouth of the abnormal plastic bottle; The second-class contents in the abnormal plastic bottle are driven by gas, and the second-class contents in the abnormal plastic bottle are taken out of the abnormal plastic bottle and removed; When there is no Category II content in the abnormal plastic bottle; Stop gripping and release the abnormal plastic bottle; Crush the released abnormal plastic bottles.

5. A plastic recycling method according to claim 2, characterized in that: The contents of the abnormal plastic bottles are recorded as three types of contents and the third removal strategy is implemented, specifically: Get the bottle mouth position of the abnormal plastic bottle; The position 3 cm away from the bottle mouth on the body of the abnormal plastic bottle is recorded as the clamping position; Grab the abnormal plastic bottle at the gripping position; If the abnormal plastic bottle has a bottle cap; Then remove the caps of abnormal plastic bottles; When the abnormal plastic bottle does not have a cap; Remove the bottom of abnormal plastic bottles; Introduce gas into the abnormal plastic bottle through the mouth of the abnormal plastic bottle; If gas is introduced into the abnormal plastic bottle; The three types of contents in the abnormal plastic bottle were not completely removed; Increase the pressure of the gas introduced; Set the time T and air pressure threshold P; When the pressure of the gas introduced is equal to the pressure threshold P and the time of gas introduction is equal to T; The three types of contents in the abnormal plastic bottle were not completely removed; Stop the gas supply; Clip the three types of contents from the bottom of the abnormal plastic bottle, take them out and remove them; When the three types of contents no longer exist in the abnormal plastic bottle; Stop picking up abnormal plastic bottles; Crush the released abnormal plastic bottles.

6. A plastic recycling method according to claim 1, characterized in that: The plastic sheets are cleaned and collected, specifically: Crushing Class II plastic and abnormal plastic bottles into plastic flakes; The plastic sheets are sent to the No. 1 water tank for cleaning; Set the water temperature in pool 1 to 70 degrees Celsius; Plastic flakes collected in Pool 1 after washing; The plastic sheets are sent to the No. 1 water tank for cleaning; Set the water temperature in pool 1 to 20 degrees Celsius; Plastic pieces collected on the surface of Pool No. 2.

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