CN110883974A - Method for recycling and granulating waste agricultural films - Google Patents

Method for recycling and granulating waste agricultural films Download PDF

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Publication number
CN110883974A
CN110883974A CN201811045203.7A CN201811045203A CN110883974A CN 110883974 A CN110883974 A CN 110883974A CN 201811045203 A CN201811045203 A CN 201811045203A CN 110883974 A CN110883974 A CN 110883974A
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China
Prior art keywords
agricultural film
conveying
extrusion granulator
waste
recycling
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CN201811045203.7A
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Chinese (zh)
Inventor
连金涛
倪林华
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Kunming Hao Bai Agricultural Technology Co Ltd
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Kunming Hao Bai Agricultural Technology Co Ltd
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Priority to CN201811045203.7A priority Critical patent/CN110883974A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/04—Disintegrating plastics, e.g. by milling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B2017/001—Pretreating the materials before recovery
    • B29B2017/0015—Washing, rinsing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Abstract

The invention belongs to the technical field of agriculture and environmental protection, and relates to a method for recovering and granulating waste agricultural films, which comprises the following steps: a, conveying agricultural film fragments to a first-order extrusion granulator, compacting and melting to obtain agricultural film melt; the first-order extrusion granulator is a diameter-variable technology expansion blanking machine; b, conveying the agricultural film melt in the step a to a second-order extrusion granulator, compacting, cooling and plasticizing, extruding columnar materials, and filtering impurities in the agricultural film melt; the second-order extrusion granulator is of a reverse exhaust smoke collection structure; c, conveying the columnar material prepared in the step b to a three-stage extrusion granulator, continuously compacting and plasticizing, and uniformly and compactly extruding a neck mold to form a strip-shaped material; the three-order extrusion granulator is of a high-power compression structure; d, cooling, blow-drying and dicing the strip-shaped material to obtain plastic particles. The method for recycling and granulating the waste agricultural film disclosed by the invention eliminates white pollution and realizes the cyclic utilization and sustainable development of resources.

Description

Method for recycling and granulating waste agricultural films
Technical Field
The invention belongs to the technical field of agriculture and environmental protection, and particularly relates to a method for recycling and granulating waste agricultural films.
Background
The agricultural film, also called as film plastic, includes mulching film (also called agricultural mulching film) and greenhouse film, and its main component is polyethylene. The fertilizer is mainly used for covering farmlands, plays roles in improving the ground temperature, maintaining the soil humidity, promoting seed germination and rapid seedling growth, and also has the role of inhibiting weed growth. The mulching film technology is popularized and used in a large area from the last 90 th century, and has the remarkable characteristics of storing water, preserving soil moisture, improving ground temperature, prolonging the growth period of crops, promoting the growth of the crops, increasing yield, reducing adverse effects on the growth of the crops caused by natural disasters such as hail, drought, wind, sand, temperature difference and the like, so that huge economic benefits are brought to agricultural production, and the technology plays a positive role in promoting the sustainable development of rural economy.
However, according to investigation, about 30% of the undegradable mulching film remains in 30 cm-deep cultivated land every year. In the plots using the mulching film for 18 years, the residual quantity of the mulching film per mu is more than 2 kilograms. The mulching films are extremely difficult to degrade under natural conditions and can exist in soil for 200-400 years. The remained agricultural film destroys the physical and chemical structures of the soil, inhibits the growth of soil microorganisms, reduces the air permeability and water permeability of the soil, and influences the quality of cultivated land; finally, the crops are difficult to germinate and emerge, the root growth of the crops is hindered, the absorption of the crops to soil moisture and nutrients is reduced, the yield of the crops is reduced, the yield and the quality of agricultural products are influenced, and the income of farmers is greatly influenced.
The problems are more serious because the excessive mulching films and the waste mulching films cannot be recycled in time. However, the waste agricultural films cannot be effectively disposed by simply picking up and burying, and the environment is seriously polluted secondarily by burning on the spot.
Patent CN 104494000 a discloses a method for treating waste mulching films. The method adopts a film holding machine or a machine provided with film holding teeth to recycle residual films, and selects 1-2 types of building film machines or film holding teeth suitable for local use, so that the recovery rate of the mulching films reaches more than 90%; and simultaneously, treating and granulating the recovered mulching film. The waste mulching film treatment method mainly provides improvement aiming at the current situation of low mulching film recovery rate, and does not further improve the granulation process; meanwhile, the cleaning process of the waste agricultural film is not improved.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for recycling and granulating waste agricultural films, which has high compaction density of plastic particles, regular internal structure and high quality.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for recycling and granulating waste agricultural films is characterized by comprising the following steps:
uniformly conveying the cleaned agricultural film fragments to a first-order extrusion granulator, compacting and melting to obtain an agricultural film melt; the first-order extrusion granulator is a diameter-variable technology expansion blanking machine, and can ensure that materials obtained by pretreatment uniformly and continuously enter a screw charging barrel, and are further compacted, melted and extruded to obtain primary uniform first-order extruded materials;
b, conveying the agricultural film melt in the step a to a second-order extrusion granulator, compacting, cooling and plasticizing, extruding columnar materials, and further filtering impurities; the second-order extrusion granulator is of a reverse exhaust smoke collection structure and can discharge moisture and other volatile components;
c, conveying the columnar material prepared in the step b to a three-stage extrusion granulator, continuously compacting and plasticizing, continuously filtering impurities, and uniformly and compactly extruding a neck mold to form a strip-shaped material; the three-order extrusion granulator is of a high-power compression structure.
Preferably, the second-order extrusion granulator is provided with a double-station hydraulic automatic screen changer and a filter screen structure; the double-station hydraulic automatic screen changer and the filter screen jointly act to filter impurities such as sand, stone, metal and the like in the material; the reverse exhaust smoke collection structure, the double-station hydraulic automatic screen changer and the filter screen jointly ensure that the second-order extruded material particles are compact and have high density; the flue gas is collected to a circulation treatment system for treatment, and is circulated to a sewage circulation water channel, and the second-order extrusion material enters a feed inlet of a third-order extrusion granulator.
Preferably, the three-order extrusion granulator is provided with a double-station hydraulic automatic screen changer and a filter screen structure; the double-station hydraulic automatic screen changer is equipped, so that the uniformity and compactness of three-order extruded materials are further ensured, and impurities such as sand, stones and metals in the materials are further filtered under the action of the screen changer and the filter screen.
Preferably, step d is further included after step c, and the specific process is as follows: the strip-shaped materials are cooled and dried, then enter a granulator under the traction action of a traction device, and are cut into plastic particles with the diameter of 2-3 mm.
Preferably, step e is further included after step d, the sheared plastic particles are sieved to obtain plastic particles which do not meet the requirement, and the plastic particles which meet the requirement are packaged.
Preferably, the plastic particles are used for preparing water pipes or drip irrigation belts.
Preferably, the agricultural film fragments in the step a are obtained by the following steps:
1) preliminarily cleaning the collected waste agricultural film to remove impurities with larger volume;
2) conveying the waste agricultural film after preliminary cleaning to a crusher through a feeding machine for crushing to obtain agricultural film fragments; the discharge end of the feeding machine is positioned above a feed hopper of the crusher;
3) conveying the agricultural film fragments to an oblique friction cleaning machine through a first belt conveying mechanism for oblique friction cleaning; the feeding end of a first conveyor belt of the first belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the first conveyor belt is positioned above the feed hole of the oblique friction cleaning machine;
4) conveying the agricultural film fragments subjected to oblique friction cleaning to a high-speed friction cleaning machine through a second belt conveying mechanism for high-speed friction cleaning; the feeding end of a second conveyor belt of the second belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the second conveyor belt is positioned above the feed hole of the high-speed friction cleaning machine;
5) conveying the agricultural film fragments subjected to high-speed friction cleaning to a vertical friction cleaning machine through a third belt conveying mechanism to perform vertical friction cleaning; the feeding end of a third conveyor belt of the third belt conveying mechanism is positioned below the discharge hole of the high-speed friction cleaning machine, and the discharge end of the third conveyor belt is positioned above the feed hole of the vertical friction cleaning machine;
6) conveying the agricultural film fragments subjected to vertical friction cleaning to a rinsing separation pool through a fourth belt conveying mechanism for rinsing separation; the feeding end of a fourth conveyor belt of the fourth belt conveying mechanism is positioned below the discharge port of the vertical friction cleaning machine, and the discharge end of the fourth conveyor belt is positioned above the rinsing separation tank;
7) conveying the rinsed and separated agricultural film fragments to a compression dehydrator for compression dehydration. .
Preferably, in the step 2), the feeding machine is of a climbing toothed belt structure, and automatically cuts the long waste agricultural film while feeding, and then sends the waste agricultural film to a crusher for crushing; when the crusher crushes the waste agricultural films, water is added while crushing.
Preferably, the crushing time of the waste agricultural film in the crusher is 2-3 min, the cleaning time in the oblique friction cleaning machine is 4-6 min, the cleaning time in the high-speed friction cleaning machine is 3-5 min, the cleaning time in the vertical friction cleaning machine is 3-5 min, and the cleaning time in the rinsing separation tank is 2-4 min.
Preferably, the step 7) is followed by a step 8) of conveying the compressed and dehydrated agricultural film fragments to a buffer storage bin while scattering the agricultural film fragments by a synchronous collecting and conveying device.
The invention has the beneficial technical effects that:
1) the plastic particles obtained by the method disclosed by the invention are granulated for three times, and the compact density of the obtained plastic particles is large (the density distribution range of the obtained plastic particles is 0.93-0.96G/CM3) Internal structural rules.
2) The strip material obtained by the method disclosed by the invention is easy to be plastic and has good plasticity after being granulated for three times, and the plastic particles obtained by the material cutting of the cutting machine are regular, and the qualification rate is up to more than 99%.
3) The plastic granules obtained by the method disclosed by the invention are high in quality, no dust particles are detected in the plastic granules, and the secondary application is wide.
4) The method disclosed by the invention is used for cleaning the waste agricultural film, so that very clean agricultural film fragments can be obtained, and the subsequent granulation is greatly facilitated.
The method disclosed by the invention is beneficial to eliminating white pollution, protecting cultivated land, improving agricultural ecological environment, realizing regional agricultural clean production, being beneficial to recycling waste agricultural films and increasing direct income of farmers. After the waste agricultural film is recovered and granulated, the method can be used for producing plastic water-saving irrigation equipment such as a tobacco containing frame, a seedling raising water pool, a water delivery pipe, a drip irrigation belt and the like, realizes the cyclic utilization and sustainable development of resources, and enriches the production materials.
Drawings
FIG. 1 is a schematic flow chart of a recycling and granulating method of waste agricultural films according to embodiment 1 of the present invention;
fig. 2 is a diagram of a plastic granule produced by the recycling granulation method of the waste agricultural film in embodiment 1 of the present invention.
Detailed Description
The invention is further described in the following with specific embodiments in conjunction with the accompanying drawings.
It is understood that within the scope of the present invention, the above-described technical features of the present invention and the technical features specifically described below (e.g., examples) may be combined with each other to constitute a new or preferred technical solution. Not to be reiterated herein, but to the extent of space. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention.
Agricultural film
The agricultural film is also called as film plastic, and comprises a mulching film (also called agricultural mulching film), a greenhouse film (also called agricultural greenhouse film) and other agricultural plastic films, wherein the main component of the agricultural plastic film is polyethylene. The fertilizer is mainly used for covering farmlands, plays roles in improving the ground temperature, maintaining the soil humidity, promoting seed germination and rapid seedling growth, and also has the role of inhibiting weed growth.
Waste agricultural film recovery
And (3) uncovering the film at a proper time, or uncovering the film in one piece before the next batch of land is ploughed and the covering film is not aged, recycling the film to the field and the front of a house, spreading and drying the film, removing impurities such as sand, stone, soil, leaves, weeds and the like on the film, folding the film into 10 kg/package and 20 kg/package, bundling and packaging, wherein the bundling and packaging can utilize the waste film with better strength to keep the purity of the recycled film, and then selling the film to a nearby designated agricultural professional cooperative. Transporting the finished waste agricultural films to a waste agricultural film recycling processing workshop yard for pretreatment by the cooperative.
Sorting and pretreating the waste agricultural films to obtain clean materials, and granulating.
The sorting refers to sorting according to the types and the shapes of the agricultural films.
The sorting aims to avoid poor performance caused by incompatibility of recycled materials due to mixing of different polymers, and the sorting according to the shapes of products is to facilitate the smooth crushing process of waste plastics.
The invention is further described below by means of specific examples. Unless otherwise noted, the machine equipment according to the embodiments is commercially available.
Examples
The waste agricultural film (white) is recovered from a certain tobacco leaf planting field in Liangshan, Sichuan province.
The recycled waste mulching films are subjected to sorting pretreatment, scattered and packaged, and obvious impurities and other types of plastics are removed.
As shown in figure 1, the method for recycling and granulating the waste agricultural films comprises two steps, namely cleaning the waste agricultural films and granulating.
The method for cleaning the waste agricultural film comprises the following specific steps:
1) preliminarily cleaning the collected waste agricultural film to remove impurities with larger volume;
2) conveying the waste agricultural film after preliminary cleaning to a crusher through a feeding machine for crushing for 2-3 min to obtain agricultural film fragments; the discharge end of the feeding machine is positioned above a feed hopper of the crusher; the feeding machine is of a climbing toothed belt structure, and automatically cuts the long waste agricultural film while feeding, and then sends the waste agricultural film to the crusher for crushing; when the crusher crushes the waste agricultural films, water is added while crushing. The crusher is of a wet shearing type, is efficient and double-V-shaped cutter, has large turning diameter and high power, is used for pouring water and crushing, and discharges most of soil, sand and stone to a circulating water channel below a production line along a water outlet of the crusher while crushing waste agricultural films;
3) conveying the agricultural film fragments to an oblique friction cleaning machine through a first belt conveying mechanism for oblique friction cleaning for 4-6 min; the feeding end of a first conveyor belt of the first belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the first conveyor belt is positioned above the feed hole of the oblique friction cleaning machine; the inclined friction cleaning is one-time synchronous cleaning and pollution discharge, the materials agglomerated during the crushing are scattered while the silt on the crushed waste film is cleaned, and the silt is discharged to a circulating ditch;
4) conveying the agricultural film fragments subjected to oblique friction cleaning to a high-speed friction cleaning machine through a second belt conveying mechanism for high-speed friction cleaning for 3-5 min; the feeding end of a second conveyor belt of the second belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the second conveyor belt is positioned above the feed hole of the high-speed friction cleaning machine;
5) conveying the agricultural film fragments subjected to high-speed friction cleaning to a vertical friction cleaning machine through a third belt conveying mechanism for vertical friction cleaning for 3-5 min; the feeding end of a third conveyor belt of the third belt conveying mechanism is positioned below the discharge hole of the high-speed friction cleaning machine, and the discharge end of the third conveyor belt is positioned above the feed hole of the vertical friction cleaning machine;
6) conveying the agricultural film fragments subjected to vertical friction cleaning to a rinsing separation pool through a fourth belt conveying mechanism for rinsing separation for 2-4 min; the feeding end of a fourth conveyor belt of the fourth belt conveying mechanism is positioned below the discharge port of the vertical friction cleaning machine, and the discharge end of the fourth conveyor belt is positioned above the rinsing separation tank;
7) conveying the rinsed and separated agricultural film fragments to a compression dehydrator for compression dehydration; in the step, the cleaned agricultural film fragments are conveyed to a compression dehydrator through a synchronous extraction conveying device to be forcedly compressed and dehydrated;
conveying the compressed and dehydrated agricultural film fragments to a synchronous collecting and conveying device, scattering the fragments while conveying the fragments to a buffer storage and stacking bin; wherein, the synchronous extraction conveying device is selected from a synchronous belt conveyor and/or a synchronous wheel conveyor; the synchronous collecting and conveying device is optionally provided with a synchronous belt conveyor and/or a synchronous wheel conveyor;
8) the compressed and dehydrated agricultural film fragments are scattered and conveyed to a buffer storage and stacking bin through a synchronous collecting and conveying device.
The granulation comprises the following specific steps:
uniformly conveying the cleaned agricultural film fragments to a first-order extrusion granulator, compacting and melting to obtain an agricultural film melt; the first-order extrusion granulator is a diameter-variable technology expansion blanking machine, and can ensure that materials obtained by pretreatment uniformly and continuously enter a screw charging barrel, and are further compacted, melted and extruded to obtain primary uniform first-order extruded materials; in order to improve the melting effect, the ratio of the length to the diameter of the crankshaft of the first-order extrusion granulator is preferably larger, and the selectable ratio is between 30 and 50; the heating temperature of the first-order extrusion granulator is preferably controlled to be near the melting point of the material;
b, conveying the agricultural film melt in the step a to a second-order extrusion granulator, compacting, cooling and plasticizing, extruding columnar materials, and filtering impurities; the second-order extrusion granulator is of a reverse exhaust smoke collection structure and is provided with a double-station hydraulic automatic screen changer and a filter screen structure, the double-station hydraulic automatic screen changer and the filter screen jointly act to filter sand, stone, metal and other impurities in the materials, meanwhile, moisture and other volatile components are discharged, the smoke is collected to a circulation treatment system for treatment and is circulated to a sewage circulation water channel, and the columnar material enters a discharge hole of the third-order extrusion granulator; the reverse exhaust smoke collection structure, the double-station hydraulic automatic screen changer and the filter screen jointly ensure that the second-order extruded material particles are compact and have high density; wherein, the cooling water temperature is too high, the product particles can not be cooled well, the particles are easy to stick or stick to a knife, and trailing particles and fragments are generated; the temperature of the cooling water is too low, so that the melt is vitrified rapidly, and the particle quality is greatly reduced; therefore, the cooling water temperature is controlled between 10 and 100 degrees, preferably between 20 and 60 degrees;
c, conveying the columnar material processed in the step b to a three-stage extrusion granulator, continuously compacting and plasticizing, continuously filtering impurities, and uniformly and compactly extruding a neck mold to form a strip-shaped material; the three-order extrusion granulator is of a high-power compression structure and is provided with a double-station hydraulic automatic screen changer and a filter screen structure; the double-station hydraulic automatic screen changer is arranged, so that the uniformity and compactness of three-order extruded materials are further ensured, and impurities such as sand, stones and metals in the materials are further filtered under the action of the screen changer and the filter screen;
d, cooling the strip-shaped material by a cooling water tank, drying the strip-shaped material by a high-pressure blower, then feeding the strip-shaped material into a granulator under the traction action of a traction device, and shearing the strip-shaped material into plastic particles with the diameter of 2-3 mm;
e, screening the plastic granules by an automatic screening device to obtain particles which do not meet the requirements (according to the test of DIN53477-1992 plastics, the particle size and the distribution of the molding material are measured by a dry screening method, the particle size is detected, the qualification rate is 99.96 percent), and feeding the particles which meet the requirements into a filling system, subpackaging the particles into equal-amount packages required by customers, and sealing and warehousing the packages. The resulting plastic particles were tested for dust particles according to standard test method for measuring powder and dust particles in plastic particles using wet analysis method astm d 7486-2014.
The obtained plastic particle impurity detection result is as follows: it was not detected.
The density of the obtained plastic particles is as follows: 0.94G/CM3。
The plastic particles prepared by the method can be used for preparing water delivery pipes or drip irrigation belts.
The three-stage granulation process disclosed by the invention has the following characteristics:
1) the third granulation, the obtained plastic granules have high compact density (0.93-0.96G/CM)3) Internal structural rules.
2) And (3) granulating for three times, wherein the obtained strip-shaped material is easy to have good plasticity, and the plastic particles obtained by cutting the material by a cutting machine are regular, and the qualification rate is up to more than 99%.
3) And 3, the obtained plastic particles are high in quality after three times of granulation, dust particles are not detected in the plastic particles, and the secondary application range is wide.
4) The screen changer and the filter screen are used for filtering twice, the content of impurities such as sand, stone, dust and the like is lower, and the quality of the finally obtained plastic particles is high.
The main machinery equipment used in the granulation method is as follows:
the granulating step adopts a three-machine combined special granulator for the agricultural film. Wherein the content of the first and second substances,
host computer No. 1: model SJ200F 3; the power is 55 KW; the speed reducer is a state trade tooth surface square box speed reducer, and is provided with an oil pump forced lubrication and oil temperature cooling system, and the flange plate is provided with a heat dissipation process design; the charging barrel screw technology is as follows: a reducing hardening machine barrel with expanding forced blanking, a high-frequency quenching hardening wear-resistant machine barrel, a screw wear-resistant alloy and a lengthening mixing type; the environment-friendly structure is a combined fully-closed structure and is provided with a flue gas collecting cover.
No. 1 host computer environmental protection intelligent heater model does: an intelligent digital high-frequency energy-saving induction heater; the heating inductor is a pure red copper induction coil and a heat insulation magnetic conductivity material; 2, integrating; the heating reserve power/capacity is 140 KW; the actual heating average power consumption is in a range of 40-80KW, and the multi-path automatic adjustment is carried out in a partitioning mode; the combined magnetic isolation protective cover is surrounded.
No. 2 auxiliary engine: the model is SJ150 reverse exhaust type; power 18.5 KW; the speed reducer is a square box/forced automatic lubrication belt for heat dissipation and slag discharge; the screw charging barrel technology is that the depth of a high-frequency quenching hardened layer reaches 5mm, and the screw is provided with wear-resistant alloy; the heater is a stainless steel quartz heater, and the die head is internally provided with a core rod for heating; the transmission is belt wheel transmission; the exhaust is reverse exhaust and explosion prevention, and environment-friendly flue gas is collected in a bin.
The model of the No. 2 auxiliary engine screen changer is 250 × 2 hydraulic drive; the main body is made of alloy plate double stations; the net changing mode is a non-stop net changer; preheating the mould to be built-in heating; the heating technology adopts core heating, and is safe and efficient.
No. 3 auxiliary engine: the model is SJ130 matched with a third auxiliary machine; the power is 15 KW; the speed reducer is a square box speed reducer, forced lubrication is carried out by an oil pump, and the flange plate is provided with a heat dissipation process design; the auxiliary heater is a stainless steel quartz heater; the material rod of the machine barrel is in a high-power compression ratio, and the screw of the machine barrel is quenched and hardened in a high frequency mode.
The model of the No. 3 auxiliary engine screen changer is 250 × 2 hydraulic drive; the main body is made of alloy plate double stations; the net changing mode is a non-stop net changer; preheating the mould to be built-in heating; the heating technology adopts core heating, and is safe and efficient.
Wherein the model of the cooling water tank is standard 4000; the structure is a sliding locking mechanism with a universal wheel and a guide roller; a cold and hot water exchange device is adopted.
The granulator adopts a traction granulator, and the model of the traction granulator is a 220 alloy hob; the structure is gantry type, and the sliding locking mechanism is provided with universal wheels; the power is 3 KW; controlling stepless speed regulation to match with traction extrusion speed; the number of cutters and the material thereof are 24-cutter alloy hobs.
The total set of 8 motors is selected from Chongqing Zhengchang.
Other machine equipment, installation accessories, spare parts/distribution equipment and parts are conventional in the art.
The above description is only a preferred embodiment of the present invention, and it should be understood that the present invention is not limited to the above description, which should be interpreted as a limitation, since modifications can be made to the embodiment and its application range by those skilled in the art in light of the above description.

Claims (10)

1. A method for recycling and granulating waste agricultural films is characterized by comprising the following steps:
uniformly conveying the cleaned agricultural film fragments to a first-order extrusion granulator, compacting and melting to obtain an agricultural film melt; the first-stage extrusion granulator is a diameter-variable technology expansion blanking machine, a crushed material firstly enters a large-diameter section, enters a small-diameter section after being preliminarily compacted, and then is compacted, melted and extruded out of a cylindrical neck mold;
b, conveying the agricultural film melt in the step a to a second-order extrusion granulator, compacting, cooling and plasticizing, extruding columnar materials, and further filtering impurities; the second-order extrusion granulator is of a reverse exhaust smoke collection structure;
c, conveying the columnar material prepared in the step b to a three-stage extrusion granulator, continuously compacting and plasticizing, continuously filtering impurities, and uniformly and compactly extruding a neck mold to form a strip-shaped material; the three-order extrusion granulator is of a high-power compression structure.
2. The recycling and granulating method of waste agricultural films according to claim 1, wherein the second-order extrusion granulator is provided with a double-station hydraulic automatic screen changer and a screen structure.
3. The recycling and granulating method of waste agricultural films according to claim 1, wherein the three-stage extrusion granulator is provided with a double-station hydraulic automatic screen changer and a filter screen structure.
4. The method for recycling and granulating the waste agricultural film as claimed in claim 1, wherein the method further comprises a step d after the step c, and the specific process is as follows: the strip-shaped materials are cooled and dried, then enter a granulator under the traction action of a traction device, and are cut into plastic particles with the diameter of 2-3 mm.
5. The recycling and granulating method of waste agricultural films as claimed in claim 4, further comprising a step e after the step d, screening the sheared plastic granules, screening out plastic granules which do not meet the requirement, and packaging the plastic granules which meet the requirement.
6. The recycling and granulating method of waste agricultural films according to any one of claims 1 to 5, wherein the plastic particles are used for preparing water delivery pipes or drip irrigation belts.
7. The recycling and granulating method of waste agricultural films according to any one of claims 1 to 5, wherein the agricultural film fragments in the step a are obtained by the following steps:
1) preliminarily cleaning the collected waste agricultural film to remove impurities with larger volume;
2) conveying the waste agricultural film after preliminary cleaning to a crusher through a feeding machine for crushing to obtain agricultural film fragments; the discharge end of the feeding machine is positioned above a feed hopper of the crusher;
3) conveying the agricultural film fragments to an oblique friction cleaning machine through a first belt conveying mechanism for oblique friction cleaning; the feeding end of a first conveyor belt of the first belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the first conveyor belt is positioned above the feed hole of the oblique friction cleaning machine;
4) conveying the agricultural film fragments subjected to oblique friction cleaning to a high-speed friction cleaning machine through a second belt conveying mechanism for high-speed friction cleaning; the feeding end of a second conveyor belt of the second belt conveying mechanism is positioned below the discharge hole of the crusher, and the discharge end of the second conveyor belt is positioned above the feed hole of the high-speed friction cleaning machine;
5) conveying the agricultural film fragments subjected to high-speed friction cleaning to a vertical friction cleaning machine through a third belt conveying mechanism to perform vertical friction cleaning; the feeding end of a third conveyor belt of the third belt conveying mechanism is positioned below the discharge hole of the high-speed friction cleaning machine, and the discharge end of the third conveyor belt is positioned above the feed hole of the vertical friction cleaning machine;
6) conveying agricultural film fragments subjected to vertical friction cleaning to a rinsing separation pool for rinsing separation;
7) conveying the rinsed and separated agricultural film fragments to a compression dehydrator for compression dehydration.
8. The recycling and granulating method of waste agricultural films according to claim 7, wherein in the step 2), the feeding machine is of a climbing toothed belt structure, and automatically cuts the long waste agricultural films while feeding, and then sends the waste agricultural films to a crusher for crushing; when the crusher crushes the waste agricultural films, water is added while crushing.
9. The recycling and granulating method of waste agricultural films according to claim 7, wherein the crushing time of the waste agricultural films in a crusher is 2-3 min, the cleaning time in an oblique friction cleaning machine is 4-6 min, the cleaning time in a high-speed friction cleaning machine is 3-5 min, the cleaning time in a vertical friction cleaning machine is 3-5 min, and the cleaning time in a rinsing separation tank is 2-4 min.
10. The recycling and granulating method of waste agricultural films according to claim 7), characterized by further comprising a step 8) after the step 7), and conveying the compressed and dehydrated agricultural film fragments to a buffer storage and stacking bin through a synchronous collecting and conveying device while scattering the agricultural film fragments.
CN201811045203.7A 2018-09-07 2018-09-07 Method for recycling and granulating waste agricultural films Pending CN110883974A (en)

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CN104387770A (en) * 2014-12-03 2015-03-04 常熟市金泉化纤织造有限责任公司 Preparation method of modified polyphenylene sulfide composite master batch
CN104494008A (en) * 2014-12-19 2015-04-08 巴州汇丰塑业有限公司 Production equipment for waste and old mulching film particles and preparation process thereof
CN104772836A (en) * 2015-05-05 2015-07-15 江苏申源新材料有限公司 Cold cutting prilling unit for cable material machining
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CN104118108A (en) * 2014-06-26 2014-10-29 东莞市汇如涞电能科技有限公司 Material strip granulation production process and material strip traction equipment used in material strip granulation production process
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Application publication date: 20200317