A waste plastic woven bag recycling system

Abstract

The application belongs to the technical field of plastic woven bag recycling processing, in particular to a waste plastic woven bag recycling processing system, which comprises a bag body sleeving unit, a self-adaptive opening module, a cleaning module, a detection module, a control module and a bag taking unit; the self-adaptive opening module comprises a bottom plate and a driving unit, and a pair of first rods and a pair of second rods are arranged on the top of the bottom plate, and a pair of the first rods are used for supporting both ends of the stitched end of the bag body; the application supports the stitched end of the waste plastic woven bag through a pair of first rods, accurately calculates the opening distance in combination with a parameter formula, and realizes the maximum unfolding of the bag body without wrinkles by matching a pressure sensor for real-time monitoring and dynamic correction of tension; the design effectively solves the problems of the stitched end being prone to wrinkles, impurities being difficult to clean, insufficient cleaning space, the bag body being prone to damage and poor specification adaptability in the prior art, provides sufficient space for internal cleaning, and significantly improves the recycling processing quality and efficiency.

Description

Technical Field

[0001] This invention belongs to the field of plastic woven bag recycling technology, specifically a waste plastic woven bag recycling system. Background Technology

[0002] The waste woven plastic bag recycling and processing system is a closed-loop solution integrating "recycling-sorting-processing-reuse". It is designed for various types of waste woven plastic bags (such as fertilizer bags, building material bags, express delivery bags, etc.). The system combines automated equipment with manual assistance to first collect, classify and remove impurities from the woven plastic bags. Then, through core processes such as washing, crushing, drying and granulation, the waste woven plastic bags are transformed into recycled plastic pellets. This system can effectively solve the environmental pollution problem caused by the disposal of woven plastic bags and realize resource recycling.

[0003] A Chinese patent with publication number CN118544487A discloses a waste plastic woven bag recycling and processing equipment, including a shell and a conveyor belt, and further including: a support mechanism, including several second support plates, with a first support plate installed above the second support plates, and support rods for supporting woven bags symmetrically installed on the upper surface of the first support plate; a cleaning mechanism, including two brushes and an internal cleaning assembly; the present invention solves the problems of existing devices being unable to continuously clean and unable to remove all impurities between the flat fibers of the woven bags, thus affecting the recycling efficiency.

[0004] The following problems exist in the existing technology:

[0005] First, there is a lack of specific support and precise tension control for the sewn ends of waste plastic woven bags. The bag body is only supported by rigid structures or basic supports, which leads to uneven stress on the sewn ends, wrinkles, and dead corners where impurities can be hidden. Subsequent cleaning cannot completely remove impurities from the gaps, affecting the quality of recycling and reprocessing.

[0006] Secondly, its support structure can only initially open the bag, and cannot maximize the opening of the bag without causing wrinkles. Therefore, it cannot provide an effective working space for the internal cleaning unit, which in turn limits its cleaning effect and affects its subsequent recycling efficiency.

[0007] Third, there is no dynamic adaptation protection mechanism. The waste plastic woven bags are brittle and have large size differences. The fixed support method is prone to damage to the bag body and cannot adjust the support force according to the real-time status of the bag body, which further reduces the recycling efficiency and the yield of finished products.

[0008] Therefore, the present invention provides a waste plastic woven bag recycling and processing system. Summary of the Invention

[0009] To address the shortcomings of existing technologies, such as the lack of specific support and precise tension control for the sewn ends of waste woven plastic bags, which easily leads to wrinkles and the formation of dead corners where impurities can be hidden, and the inability to fully expand the bags, resulting in insufficient cleaning space, as well as the lack of a dynamic adaptation and protection mechanism, the bags are prone to damage and have poor size compatibility, seriously affecting the quality and efficiency of recycling and processing.

[0010] The technical solution adopted by the present invention to solve its technical problem is: the waste plastic woven bag recycling and processing system of the present invention includes a bag fitting unit, an adaptive expansion module, a cleaning module, a detection module, a control module and a bag picking unit;

[0011] The adaptive expansion module includes a base plate and a drive unit. The top of the base plate is provided with a pair of first rods and a pair of second rods. The pair of first rods is used to support the two ends of the sewn end of the bag body, and the pair of second rods is used to support the bag body in a direction perpendicular to the sewn end. The first rods and the second rods are both driven by the drive unit to achieve relative movement.

[0012] The top of the first rod and the second rod are respectively fixed with a corresponding rod for the curved part and an arc-shaped flexible rod, and the reverse curved surfaces of the pair of corresponding rods for the curved part are arranged opposite to each other;

[0013] The detection module includes a pressure sensor and a monitoring unit. The pressure sensor is used to monitor the pressure on the first rod during its movement, and the monitoring unit is used to monitor the wastewater quality conditions after rinsing the bag.

[0014] The control module is used to receive signals from the pressure sensor and control the first rod and the second rod to synchronously adjust their moving distance according to a preset ratio calculated based on the bag size.

[0015] The bag fitting unit is used to fit the bag onto a pair of first and second rods;

[0016] The bag-removing unit is used to remove the cleaned bags from the first and second bars and transfer them to the next stage.

[0017] Preferably, the preset ratio is the ratio of the distance L1 moved by the first rod to the distance L2 moved by the second rod, and the ratio ranges from 1.8:1 to 2.2:1; wherein:

[0018] The distance L1 that the first rod moves is equal to the length L0 of the sewn section of the woven bag;

[0019] The second rod moving distance L2 is calculated using the formula L2=S0×(1+K1)×K2, where S0 is the slack width of the woven bag when laid flat, K1 is the basic tensile coefficient of 0.03~0.05, and K2 is the correction coefficient of 0.98~1.03 for different materials.

[0020] The control module receives the tension signal from the pressure sensor and dynamically corrects L2 by adjusting K1 or K2 to maintain the tension within the safe threshold of 2~5N, thereby achieving synchronous adjustment of the first and second rods.

[0021] Furthermore, the recycled PP woven bags are adapted to a tension of 0.98~1.01, the recycled PE woven bags to a tension of 1.00~1.02, and the recycled thickened woven bags (original size ≥50kg) to a tension of 1.01~1.03; the control module adjusts the correction step of K1 or K2 to 0.01 to ensure that the tension is accurately maintained at 2~5N;

[0022] Furthermore, the recycling system also includes a circular conveyor mechanism, and there are multiple base plates evenly distributed on the circumference of the circular conveyor mechanism and rotating synchronously with it (rotation direction along the tangent of the circumference, speed 0.5~1 revolutions / minute).

[0023] The bag fitting unit is fixedly installed on one side of the circular conveying mechanism. When a base plate moves to the fitting position with the circular conveying mechanism, the bag fitting unit fits the bag onto the first and second rods above the base plate.

[0024] After the mounting is completed, the circular conveyor mechanism drives the base plate to move along the circumference to the next station (adaptive opening and cleaning station), and at the same time, the next base plate moves synchronously to the mounting station, realizing the cyclical alternation of multiple base plates and forming a continuous processing flow.

[0025] Preferably, the top of each pair of curved sections is rotatably connected to a rotating shaft via a circular groove. An elliptical sphere is fixedly attached to the top of the rotating shaft, and a micro motor is fixedly attached to the bottom of the circular groove. The output end of the micro motor is fixedly connected to the bottom end of the rotating shaft.

[0026] The pressure sensor is embedded in the outer surface of one side of the major axis of the ellipsoid; the pressure sensor is used to detect the tension at the sewn end of the bag, and the tension safety threshold is 2-5N. When the tension exceeds the threshold, the pressure sensor transmits a signal to the control module to control the movement distance of the first rod.

[0027] Furthermore, the micro motor drives the ellipsoid to reciprocate 120° at a frequency of 3-5 times per second; when the tension exceeds the threshold, the control module prioritizes controlling the first rod to stop moving, and then corrects the tension by adjusting L2.

[0028] Preferably, the ellipsoid is made of flexible and wear-resistant rubber material, and a set of guide grooves are formed on the outer surface of the ellipsoid. The guide grooves are spiral inclined structures and are distributed at equal intervals along the circumference of the ellipsoid.

[0029] Furthermore, the number of the guide grooves is 3 to 4 sets, which are equidistantly distributed along the circumference of the ellipsoid (interval of 90° or 120°), with a helix angle of 15 to 20°, a groove width of 3 to 5 mm, a groove depth of 2 to 3 mm, and a groove wall radius of 0.5 mm; the guide groove extends spirally from the fixed end of the ellipsoid to the contact side of the sewing end and forms an opening.

[0030] Preferably, the cleaning module includes an internal cleaning unit and an external cleaning unit;

[0031] The external cleaning unit includes columns distributed around the circumference of the bag body. A set of water outlet channels are alternately opened from top to bottom in the columns. The columns are equipped with water inlet channels, and the water inlet channels and water outlet channels are connected.

[0032] The internal cleaning unit includes an inner high-pressure nozzle and an outer high-pressure nozzle; a set of the inner high-pressure nozzles and the outer high-pressure nozzles are respectively located on the inner and outer sides of the first rod, and the outer side of the first rod is in contact with the bag body; a set of inner high-pressure nozzles on the upper part of the first rod are inclined toward the sewn end of the bag body, and the outer high-pressure nozzles are fan-shaped nozzles; a set of secondary high-pressure nozzles are provided on the second rod, and the secondary high-pressure nozzles are respectively located toward the inner sidewalls of the bag on both sides.

[0033] Furthermore, the outer end of the water outlet tank of the external cleaning unit is connected to an external nozzle with a spray angle of 45°, and the water inlet tank is independently connected to each water outlet tank through a branch pipe; the inner high-pressure nozzle of the upper part of the first rod has an inclination angle of 30° and a spray pressure of 0.3MPa; the fan-shaped nozzle of the outer high-pressure nozzle has a spray angle of 60° and a spray pressure of 0.15~0.2MPa; the spray range of the secondary high-pressure nozzle of the second rod overlaps with the adjacent nozzle by 10%.

[0034] Preferably, the column, the first rod and the second rod are all provided with air outlet grooves, and the air outlet grooves, water outlet grooves, inner high-pressure nozzles, outer high-pressure nozzles and secondary high-pressure nozzles are all arranged in the same direction and in the same number.

[0035] Furthermore, the air outlet is connected to a high-pressure air pump with an output pressure of 0.1~0.2MPa and an orifice diameter of 0.3~0.5mm; the air outlet, water outlet, and various nozzles are arranged alternately from top to bottom at intervals of 5~8cm, and the spray direction is consistent with the corresponding water circuit components, with each component having a one-to-one correspondence.

[0036] Preferably, the drive unit includes a drive motor, which is fixedly connected to the base plate through a holding groove. A drive shaft is fixedly connected to the output end of the drive motor, and a first gear and a second gear are fixedly connected to the drive shaft. A set of sliders is fixedly connected to the top of the base plate, and the set of sliders is arranged in a cross shape and located on both sides of the first gear and the second gear respectively. A pair of transverse toothed plates and a longitudinal toothed plate are slidably connected inside the sliders, and the pair of transverse toothed plates and the longitudinal toothed plates mesh with the first gear and the second gear respectively. The tops of the pair of transverse toothed plates and the longitudinal toothed plates are fixedly connected to the first rod and the second rod respectively through connecting rods. The drive motor and the control module are electrically connected.

[0037] Furthermore, the slider is a linear guide slider with built-in ball bearings and a moving friction force ≤5N; the tooth ratio of the first gear and the second gear is matched according to a preset ratio (1.8:1~2.2:1), for example, when the preset ratio is 2:1, the tooth ratio is 1:2; the connecting rod is detachably fixed to the first rod and the second rod by bolts.

[0038] Preferably, the monitoring unit includes a water quality sensor and a vision sensor; the water quality sensor is used to detect the concentration of impurities in the liquid after cleaning, and the vision sensor is used to capture the shape of the bag opening and the condition of impurity residue. Both signals are transmitted to the control module to adjust the cleaning parameters.

[0039] Furthermore, the detection threshold of the water quality sensor is 50 mg / L. When the impurity concentration exceeds the threshold, the control module extends the cleaning time by 5-10 seconds or increases the pressure by 0.05 MPa. The visual sensor captures images at a frequency of 10 frames / second and judges wrinkles and impurity residues through image recognition (residual area ratio ≤5% is qualified), with a signal sampling interval of 0.5 seconds.

[0040] Preferably, it also includes a parameter preset module, which can store at least 20 different specifications of woven bags corresponding to stretching parameters and washing parameters. The stretching parameters include the length of the sewn end, the width of the flat relaxation and the stretching ratio of the first rod and the second rod, for the control module to call.

[0041] Furthermore, the cleaning parameters include water spray pressure (0.15~0.3MPa), air jet pressure (0.1~0.2MPa), water spray duration (5~15 seconds), air jet duration (3~8 seconds), and gas-liquid linkage interval (0.5~1 seconds). The parameter preset module uses an erasable and rewritable memory chip, which supports users to add, delete, and modify parameter groups through the human-machine interface. The control module's response time is ≤0.5 seconds.

[0042] The beneficial effects of this invention are as follows:

[0043] 1. The waste woven plastic bag recycling and processing system of the present invention, through adaptive expansion structure and parameter formula calculation, combined with dynamic tension correction, accurately adapts to waste woven plastic bags of different specifications, avoids wrinkles and damage, and ensures the subsequent cleaning effect.

[0044] 2. The waste plastic woven bag recycling and processing system of the present invention, through the design of elliptical sphere rotation and spiral guide groove, not only prevents continuous friction damage to the old bags, but also removes impurities from the sewn end in advance, laying the foundation for deep cleaning and improving the efficiency of impurity removal.

[0045] 3. The waste plastic woven bag recycling and processing system of the present invention uses a gas-liquid cross-cleaning mode (first soaking and rinsing, then air-jet peeling), combined with all-area nozzles and airflow guidance, to achieve thorough cleaning of the bag inside and out, ensuring good impurity removal effect.

[0046] 4. The waste plastic woven bag recycling and processing system of the present invention uses pressure sensor, water quality sensor and vision sensor to detect in collaboration, provide real-time feedback and adjust parameters to ensure processing accuracy and consistency and reduce the damage rate of waste bags. Attached Figure Description

[0047] The invention will now be further described with reference to the accompanying drawings.

[0048] Figure 1 This is a flowchart of the recycling and processing system in this invention;

[0049] Figure 2 This is a perspective view of the cleaning module and the adaptive expansion module of the present invention;

[0050] Figure 3 This is a three-dimensional view of the adaptive expansion module in this invention;

[0051] Figure 4 This is an exploded view of the proximal structure of the first gear in this invention.

[0052] In the diagram: 1. Adaptive expansion module; 2. Cleaning module; 11. First rod; 12. Second rod; 13. Rod corresponding to the bending part; 14. Arc-shaped flexible rod; 3. Ellipsoidal sphere; 31. Guide trough; 21. Column; 4. Drive motor; 41. Drive shaft; 42. First gear; 43. Second gear; 44. Slider; 45. Transverse toothed plate; 46. Longitudinal toothed plate. Detailed Implementation

[0053] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0054] Example 1: Basic Waste Plastic Woven Bag Recycling and Processing System

[0055] This embodiment is applicable to small and medium-sized recycling enterprises, with the goal of "low cost + core function implementation", and processes one waste plastic woven bag at a time.

[0056] 1. System Composition

[0057] Adaptive expansion module 1

[0058] Base plate: Made of 304 stainless steel, with a pair of first rods 11 and a pair of second rods 12 symmetrically arranged on the top, and a flexible arc-shaped rod 14. The curved part of the top of the first rod 11 corresponds to the rod 13 as an arc-shaped support arm (curvature radius 15cm), with opposite curved surfaces, adaptable to a sewing end length of 50~80cm. The design of the curved part corresponding to the rod 13 is to accommodate the arc shape that appears near the upper part of the sewing end after the bag is opened. If the first rod 11 is used to forcibly straighten it, it will cause wrinkles at the sewing end of the bag, which is not conducive to the cleaning of impurities. In addition, the arc-shaped flexible rod 14 is set up so that when the second rod 12 moves the arc-shaped flexible rod 14 to open the bag, a flexible rod is selected to avoid rigid opening. When the ellipsoid sphere 3 and the first rod 11 open the bag, the arc-shaped flexible rod 14, based on the extensibility of the bag and the elasticity of the flexible rod, maximizes the opening of the bag while avoiding wrinkles, exposing the internal cleaning space and thus making the impurities cleaner.

[0059] Core parameter definition and calculation logic:

[0060] Drive unit: Stepper motor driven, the first gear 42 (20 teeth) on the drive shaft 41 meshes with the transverse gear plate 45 (module 1.5), and the second gear 43 (40 teeth) meshes with the longitudinal gear plate 46 (module 1.5). The logic for the relationship between gear ratio and travel distance is as follows:

[0061] The transmission ratio i1:i2 = number of teeth of the first gear 42 : number of teeth of the second gear 43 = 20:40 = 1:2. Since L1:L2 = i2:i1, L1:L2 = 2:1, matching the preset ratio range (1.8:1-2.2:1). The slider 44 is a linear guide slider 44 with built-in ball bearings. The moving friction is ≤3N, ensuring that when the motor rotates 1 revolution, the first rod 11 moves 10cm and the second rod 12 moves 5cm (which conforms to the movement amount corresponding to the gear ratio).

[0062] The ellipsoid consists of three components: a flexible and wear-resistant rubber material (4cm for the major axis and 2cm for the minor axis). The top is connected to the corresponding rod 13 in the curved section via a rotating shaft (1cm in diameter). A micro motor inside the groove drives it to reciprocate 120° (4 times / second). A pressure sensor is embedded on the outer surface of one side of the major axis, with a detection accuracy of ±0.05N and a tension safety threshold of 2~5N, used for dynamic correction of L2.

[0063] The guide grooves 31 are in three groups, distributed at 120° intervals along the circumference of the ellipsoid 3, with a spiral angle of 18°, a groove width of 4mm, a groove depth of 2.5mm, and a groove wall radius of 0.5mm. They extend from the fixed end to the opening on the contact side of the sewing end. The design of the guide grooves 31 is to prevent the impurities at the bottom corners of the sewing end from being difficult to clean due to obstruction during cleaning. Therefore, through the design of the guide grooves 31 and the rotation of the ellipsoid 3, the impurities fall down along the guide grooves 31 and are cleaned.

[0064] L0 (Sewn section length): The straight-line distance between the two ends of the sewn section when the woven bag is laid flat (unit: cm), which is obtained by manual measurement or automatic acquisition by a visual sensor (accuracy ±0.5cm).

[0065] S0 (Lay-out relaxation width): The natural width of the bag in the direction perpendicular to the sewn section (without external stretching, unit: cm), measured in the same way as L0;

[0066] K1 (basic tensile coefficient): value ranges from 0.03 to 0.05, with a default of 0.04, used to ensure that the bag stretches slightly without wrinkles;

[0067] K2 (Material Correction Factor): 0.98~1.01 for recycled PP woven bags, 1.00~1.02 for recycled PE bags, and 1.01~1.03 for thickened bags. The default value for recycled PP bags is K2=1.00.

[0068] The control module calculates the movement distance using the formula:

[0069] L1=L0 (direct assignment to avoid excessive stretching of the suture segment);

[0070] L2=S0×(1+K1)×K2 (initial calculation followed by dynamic correction using a pressure sensor).

[0071] Cleaning Module 2

[0072] Cleaning parameter definitions: including water spray pressure (0.15~0.3MPa), air jet pressure (0.1~0.2MPa), water spray duration (5~15 seconds), air jet duration (3~8 seconds), and air-liquid linkage interval (0.5~1 second). The default parameters in this embodiment are as follows:

[0073] External cleaning unit: 4 PVC columns 21 (100cm×8cm) are distributed circumferentially, each column is equipped with 6 sets of water outlets (spaced 15cm apart), and the outer end is connected to a 45° external nozzle; the water inlet is independently connected to the water outlet through a branch pipe, equipped with a booster pump, water pressure 0.18MPa, water spray duration 8 seconds.

[0074] Internal cleaning unit: The first rod 11 has 4 high-pressure nozzles on the inner side (tilted at 30°, water pressure 0.3MPa, duration 10 seconds) and 3 fan-shaped nozzles on the outer side (60° spray, water pressure 0.18MPa); the second rod 124 has 4 secondary high-pressure nozzles (water pressure 0.2MPa), with the spray range overlapping by 10% to avoid cleaning blind spots.

[0075] Air circuit components: The column 21, the first rod 11, and the second rod 12 are all equipped with air outlet grooves (0.4mm diameter), which are connected to a high-pressure air pump with a jet pressure of 0.15MPa and a jet duration of 4 seconds; the air outlet groove and the water outlet groove are alternately spaced 6cm apart, the jet direction is consistent with the corresponding nozzle, and the air-liquid linkage interval is 1 second.

[0076] Detection and control module

[0077] Monitoring Unit: A water quality sensor (TDS-3) is installed in the sewage collection tank, with a detection threshold of 50 mg / L; a vision sensor (OV7725) is installed on the top of column 21, with a shooting frequency of 10 frames / second, and identifies a residual area ratio of ≤5% as qualified; if qualified, the cleaning module is controlled by the control module to cancel the cleaning of the bag; if unqualified, the cleaning continues.

[0078] Parameter preset module: erasable and rewritable memory chip (AT24C256), storing 20 specification parameters (including L0, S0, K1, K2 and cleaning parameters), touch screen operation, control module call response time ≤0.3 seconds, built-in formula calculation function and tension correction algorithm (sampling frequency 10Hz).

[0079] Bag fitting unit: includes guide plate (PVC material, inclined at 30°) to assist manual feeding; bag picking unit: pneumatic gripper (MHC2-16D), with a clamping force of 5~8N, to transfer to the crushing stage.

[0080] 2. Work Process

[0081] Step 1: The system starts up, the control module loads the target parameters (25kg old PP rice bag: L0=75cm, S0=38cm, K2=1.00), the first rod 11 and the second rod 12 return to their initial positions (20cm apart), and the cleaning module 2 presets the gas and liquid pressure (0.18MPa for water path, 0.15MPa for gas path).

[0082] Step 2: Bag fitting. The open end of the bag is manually fitted onto the first rod 11 and the second rod 12 along the guide plate. Once the fitting is completed, the photoelectric sensor is triggered, and the signal is transmitted to the control module.

[0083] Step 3: Adaptive expansion. The control module initially calculates: L1=75cm, L2=38×(1+0.04)×1.00=39.5cm; the drive motor 4 moves the two rods at a gear ratio of 1:2, the ellipsoid 3 reciprocates at 120°, and the guide trough 31 picks up impurities; the pressure sensor detects tension = 6N (exceeding the threshold), the control module adjusts K1 to 0.03, recalculates L2=38×1.03×1.00=39.1cm, drives the second rod 12 to retract 0.4cm, and the tension drops to 4N (safe range).

[0084] Step 4: Gas-liquid cleaning, external water spraying for 8 seconds → internal water spraying for 10 seconds → gas-liquid buffering for 1 second → air jet stripping for 4 seconds; water quality sensor detects impurity concentration of 45mg / L (below the threshold), visual sensor confirms no residue.

[0085] Step 5: Detect and retrieve the bag. The control module drives the first rod 11 and the second rod 12 to retract, and the pneumatic gripper clamps the bag and transfers it to the next stage.

[0086] Step 6: Cyclic standby, each unit resets, waiting for the next bag-body installation signal.

[0087] 3. Technical Effects

[0088] In this embodiment, an adaptive expansion structure, combined with bag parameter calculation and dynamic tension correction, precisely and quickly expands the bag, avoiding wrinkles. Wrinkles easily create dead corners where impurities can hide. This design ensures the bag is flat and smooth, guaranteeing that internal impurities are exposed without obstruction. The elliptical sphere 3 rotates 120° (preventing continuous friction damage to old bags) and the spiral guide groove 31 (pre-attaching and removing impurities from the sewn end) further enhances the cleaning foundation. Furthermore, the air-liquid cross-operation mode (external immersion, internal directional rinsing, and then air jet stripping, with simultaneous operation to prevent conflict), combined with the all-area nozzle and airflow guidance, achieves thorough internal and external impurity removal with an impurity removal rate ≥95%. Tension is controlled at 2-5N throughout the process, doubly preventing damage to the waste bag. The single-bottom plate intermittent design is low-cost and suitable for small and medium-sized enterprises.

[0089] Example 2: Continuous Waste Plastic Woven Bag Recycling and Processing System

[0090] This embodiment is applicable to large-scale recycling enterprises. The addition of a circular conveyor mechanism enables multiple workstations to operate in parallel, improving processing efficiency by 50% and meeting the needs of mass production.

[0091] 1. New Structure (Based on Example 1)

[0092] Circular conveying mechanism: ring guide rail, rotation speed 0.8 rpm (7.5 seconds per station), 6 base plates evenly distributed around the circumference (consistent with the structure of Example 1), with an adjacent spacing of 50 cm; 3 stations are set along the guide rail for sleeve application, opening and cleaning, and bag removal, with photoelectric sensor (E3Z-LS63) for positioning, with an accuracy of ±0.5 cm.

[0093] Dual power supply system: 2 sets of independent air pumps and 2 sets of independent booster pumps, which power the odd-numbered and even-numbered base plates respectively. The pressure stability error is ≤±0.02MPa, ensuring parameter stability when cleaning multiple stations at the same time.

[0094] Automatic feeding mechanism: suction cup gripper (SMC-ZP3), which replaces manual setting and reduces the setting time to 5 seconds, matching the continuous rhythm.

[0095] 2. Work process optimization (core is multi-workstation synchronous linkage)

[0096] Step 1: The system starts up, the control module loads batch parameters (e.g., "50kg used PE bag": L0=90cm, S0=45cm, K2=1.01), the 6 base plates reset synchronously, and the cleaning module 2 sets the pressure.

[0097] Step 2: Bag assembly. The first base plate is automatically assembled at the assembly station, and the second base plate moves to the assembly station simultaneously, realizing parallel "assembly-processing".

[0098] Step 3: Adaptive expansion. Each base plate is independently adjusted according to the formula and tension correction logic in Example 1. Since the gear ratio is fixed (1:2), only K1 / K2 needs to be adjusted to adapt to different specifications.

[0099] Step 4: Gas-liquid cleaning. Multiple bottom plates are processed simultaneously according to the "pre-wetting-rinsing-air jetting" process. The gas-liquid parameters are consistent with those in Example 1 to ensure a stable impurity removal rate.

[0100] Step 5: Bag inspection and removal. The bag removal unit transfers qualified bags to the conveyor belt (speed 0.5m / s), and the empty bottom plate is returned to the setting station.

[0101] Step 6: Cyclic standby, the system continues to run in the "6 baseboard alternation" mode without interruption.

[0102] 3. Technical Effects

[0103] This embodiment uses a circular conveyor mechanism to drive multiple base plates to rotate in a circular cycle, enabling parallel operation of the bag-laying, opening and cleaning, and bag-removing stations, which greatly improves processing efficiency (up to 300 bags / hour, 50% higher than in Embodiment 1); the dual power supply system ensures stable gas and liquid parameters at multiple stations, avoiding pressure fluctuations from affecting the cleaning effect and opening accuracy;

[0104] Continuing the core design of adaptive expansion and gas-liquid cross-cleaning, it takes into account the impurity removal rate. The automatic feeding mechanism replaces manual installation, reducing labor costs and adapting to the large-scale and continuous processing needs of large recycling companies, achieving the dual goals of mass production and efficient cleaning.

[0105] Example 3: High-precision waste plastic woven bag recycling and processing system

[0106] This embodiment optimizes the detection and linkage process for oil stains, stubborn impurities, and thickened woven bags to meet high cleanliness requirements.

[0107] 1. Optimized structure (based on improvements to Implementation Example 1)

[0108] Detection module upgrade: The vision sensor has been replaced with a high-definition industrial camera (MV-CE050-30GM, 15 frames / second) to identify impurities with a particle size ≥0.5mm; the water quality sensor has been upgraded with temperature compensation, achieving an accuracy of ±2mg / L, and is suitable for detecting oily and wastewater.

[0109] Cleaning module 2 optimization: The cleaning parameters are adjusted to water spray pressure 0.15~0.35MPa, air jet pressure 0.1~0.18MPa, and air-liquid linkage interval 0.3 seconds; a new oil stain cleaning agent addition device (DP-100) is added, which supports spraying cleaning agent with a concentration of 5%~10%.

[0110] Expanded parameters: K1 adjustment range 0.03~0.06, correction step 0.005, pressure sensor accuracy ±0.03N, adaptable to the high tension adjustment requirements of thickened bags.

[0111] 2. Core optimization of the work process (taking "50kg thickened PP oil stain bag made of recycled material" as an example)

[0112] Step 1: Start the system and load parameters L0=95cm, S0=48cm, K2=1.03 (adaptation value for thickened bags). Set the pressure of cleaning module 2 (0.35MPa for water spray and 0.18MPa for air spray).

[0113] Step 2: Bag placement, manually assisted placement, triggering photoelectric signal.

[0114] Step 3: Adaptive expansion. Initial calculation: L1=95cm, L2=48×(1+0.05)×1.03=52.5cm; Tension feedback=5.8N (exceeding the threshold). The control module reduces K1 to 0.04, corrects L2=48×1.04×1.03=52.0cm, and reduces the tension to 4.5N.

[0115] Step 4: Gas-liquid cleaning, with the addition of "cleaning agent pretreatment" (spraying 10% cleaning agent for 2 seconds → letting stand for 3 seconds) → external pre-wetting for 8 seconds → internal rinsing for 10 seconds → buffering for 0.3 seconds → air spraying for 6 seconds; after the first cleaning, the water concentration was 62mg / L (exceeding the threshold), so a second local rinsing (3 seconds) + air spraying (3 seconds) was started, and the final concentration was 48mg / L.

[0116] Step 5: Detect and remove the bag. The visual sensor confirms that the oil residue accounts for 2% (≤5%), and the transfer is completed.

[0117] Step 6: In standby mode, the cleaning module 2 automatically discharges wastewater, preparing for the next bag to be processed.

[0118] 3. Technical Effects

[0119] This embodiment addresses the challenges of handling oil stains, stubborn impurities, and thickened waste woven plastic bags by upgrading the detection module and optimizing cleaning and stretching parameters: a high-definition industrial camera (15 frames / second) accurately identifies impurities ≥0.5mm, a water quality sensor with temperature compensation (accuracy ±2mg / L) is adapted for oil and wastewater detection, and pretreatment with 5%~10% concentration cleaning agent and 0.35MPa high-pressure rinsing achieves an oil removal rate of 98.2%; at the same time, the adjustment range of K1 is expanded (0.03~0.06, correction step 0.005), and the accuracy of the pressure sensor is improved (±0.03N) to meet the high tension adjustment requirements of thickened bags, ensuring that the tension is stable within the 2~5N safety threshold and the breakage rate is controlled below 1.5%.

[0120] The design retains the core advantages of adaptive expansion and gas-liquid cross-cleaning, and adds a "cleaning agent pretreatment + secondary local rinsing" process to achieve thorough removal of stubborn impurities. The processing efficiency reaches 180 bags / hour, meeting the core needs of high-cleanliness standard scenarios (such as the recycling of waste plastic woven bags in the food and chemical industries), while taking into account processing accuracy and stability.

[0121] IV. Multiple embodiments are applicable

[0122] Adaptive expansion principle: L1=L0, L2=S0×(1+K2)×K2, K2 is adapted according to the material, and the tension is stable at 2~5N; gear ratio i1:i2=L2:L1, to ensure accurate proportion of movement distance.

[0123] The principle of gas-liquid linkage is as follows: the gas pressure is lower than the water pressure (difference 0.05~0.1MPa), the gas and liquid are not activated at the same time (buffer ≥0.3 seconds), and the airflow and water flow are in the same direction to avoid bag damage and impurity residue.

[0124] Detection and adaptation principles: water quality threshold 50 mg / L, visual residue ≤5%, dynamic correction parameters ensure treatment meets standards. In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0125] In summary, through the specific embodiments described above, this invention fully discloses the technical solution and provides solid experimental and data support. Those skilled in the art, based on the teachings of this specification, can implement this invention and achieve the aforementioned beneficial effects.

[0126] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A waste plastic woven bag recycling and processing system, characterized in that: It includes a bag fitting unit, an adaptive expansion module (1), a cleaning module (2), a detection module, a control module, and a bag taking unit; The adaptive expansion module (1) includes a base plate and a drive unit. The top of the base plate is provided with a pair of first rods (11) and a pair of second rods (12). The pair of first rods (11) are used to support the two ends of the sewn end of the bag body, and the pair of second rods (12) are used to support the bag body in a direction perpendicular to the sewn end. The first rods (11) and the second rods (12) are both driven by the drive unit to achieve relative movement. The top of the first rod (11) and the second rod (12) are respectively fixed with a bending part corresponding rod (13) and an arc-shaped flexible rod (14), and the reverse curved surfaces of the pair of bending part corresponding rods (13) are arranged opposite to each other; The detection module includes a pressure sensor and a monitoring unit. The pressure sensor is used to monitor the pressure on the first rod (11) during its movement, and the monitoring unit is used to monitor the wastewater quality conditions after rinsing the bag. The control module is used to receive signals from the pressure sensor and control the first rod (11) and the second rod (12) to synchronously adjust their moving distance according to a preset ratio calculated based on the bag size. The bag fitting unit is used to fit the bag onto a pair of first rods (11) and second rods (12); the bag removal unit is used to remove the cleaned bag from the first rods (11) and second rods (12) and transfer it to the next stage; The preset ratio is the ratio of the moving distance L1 of the first rod (11) to the moving distance L2 of the second rod (12), and the ratio ranges from 1.8:1 to 2.2:1; wherein: The first rod (11) moves a distance L1 equal to the length L0 of the sewn section of the woven bag; The second rod (12) moving distance L2 is calculated by the formula L2=S0×(1+K1)×K2, where S0 is the slack width of the woven bag when laid flat, K1 is the basic tensile coefficient of 0.03~0.05, and K2 is the correction coefficient of 0.98~1.03 for different materials. The control module receives the tension signal from the pressure sensor and dynamically corrects L2 by adjusting K1 or K2 to maintain the tension within the 2~5N safety threshold, thereby achieving synchronous adjustment of the first rod (11) and the second rod (12). The top of each pair of curved rods (13) is rotatably connected to a rotating shaft via a circular groove, and an ellipsoid (3) is fixed to the top of the rotating shaft; The pressure sensor is embedded in the outer surface of one side of the major axis of the ellipsoid (3).

2. The waste plastic woven bag recycling and processing system according to claim 1, characterized in that: A micro motor is fixedly connected to the bottom of the circular groove, and the output end of the micro motor is fixedly connected to the bottom end of the rotating shaft. The pressure sensor is used to detect the tension at the sewn end of the bag. The tension safety threshold is 2-5N. When the tension exceeds the threshold, the pressure sensor transmits a signal to the control module to control the movement distance of the first rod (11).

3. The waste plastic woven bag recycling and processing system according to claim 2, characterized in that: The ellipsoid (3) is made of flexible wear-resistant rubber material, and a set of guide grooves (31) are provided on the outer surface of the ellipsoid (3). The guide grooves (31) are spiral inclined structures and are distributed at equal intervals along the circumference of the ellipsoid (3).

4. The waste plastic woven bag recycling and processing system according to claim 1, characterized in that: The cleaning module (2) includes an internal cleaning unit and an external cleaning unit; The external cleaning unit includes columns (21) distributed around the circumference of the bag body. A set of water outlet grooves are alternately opened from top to bottom in the column (21). A water inlet groove is provided in the column (21), and the water inlet groove and the water outlet groove are connected. The internal cleaning unit includes an inner high-pressure nozzle and an outer high-pressure nozzle; a set of the inner high-pressure nozzles and the outer high-pressure nozzles are respectively located on the inner and outer sides of the first rod (11), and the outer side of the first rod (11) is in contact with the bag body; a set of inner high-pressure nozzles on the upper part of the first rod (11) is inclined toward the sewn end of the bag body, and the outer high-pressure nozzles are fan-shaped nozzles; a set of secondary high-pressure nozzles are provided on the second rod (12), and the secondary high-pressure nozzles are respectively located toward the inner sidewalls of the bag on both sides.

5. The waste plastic woven bag recycling and processing system according to claim 4, characterized in that: The column (21), the first rod (11) and the second rod (12) are all provided with air outlet grooves, and the air outlet grooves, water outlet grooves, inner high-pressure nozzles, outer high-pressure nozzles and secondary high-pressure nozzles are all arranged in the same orientation and number.

6. The waste plastic woven bag recycling and processing system according to claim 1, characterized in that: The drive unit includes a drive motor (4). The drive motor (4) is fixedly connected to the inside of the base plate through a holding slot. A drive shaft (41) is fixedly connected to the output end of the drive motor (4). A first gear (42) and a second gear (43) are fixedly connected to the drive shaft (41). A set of sliders (44) are fixedly connected to the top of the base plate. The set of sliders (44) are arranged in a cross shape and are located on both sides of the first gear (42) and the second gear (43). A pair of transverse toothed plates (45) and a longitudinal toothed plate (46) are slidably connected inside the sliders (44). The pair of transverse toothed plates (45) and the longitudinal toothed plates (46) are respectively meshed with the first gear (42) and the second gear (43). The tops of the pair of transverse toothed plates (45) and the longitudinal toothed plates (46) are respectively fixedly connected to the first rod (11) and the second rod (12) through connecting rods. The drive motor (4) is electrically connected to the control module.

7. The waste plastic woven bag recycling and processing system according to claim 1, characterized in that: The monitoring unit includes a water quality sensor and a vision sensor; the water quality sensor is used to detect the concentration of impurities in the liquid after cleaning, and the vision sensor is used to capture the shape of the bag opening and the condition of impurity residue. Both signals are transmitted to the control module to adjust the cleaning parameters.

8. The waste plastic woven bag recycling and processing system according to claim 1, characterized in that: It also includes a parameter preset module, which can store at least 20 different specifications of woven bags corresponding to the stretching parameters and cleaning parameters. The stretching parameters include the length of the sewn end, the width of the flat relaxation and the stretching ratio of the first rod (11) and the second rod (12), which are called by the control module.

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