CN115463887B - Waste plastic recycling and processing pretreatment system - Google Patents
Waste plastic recycling and processing pretreatment system Download PDFInfo
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- CN115463887B CN115463887B CN202211109969.3A CN202211109969A CN115463887B CN 115463887 B CN115463887 B CN 115463887B CN 202211109969 A CN202211109969 A CN 202211109969A CN 115463887 B CN115463887 B CN 115463887B
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- 229920003023 plastic Polymers 0.000 title claims abstract description 131
- 239000004033 plastic Substances 0.000 title claims abstract description 131
- 239000002699 waste material Substances 0.000 title claims abstract description 36
- 238000004064 recycling Methods 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 title claims abstract description 19
- 238000005406 washing Methods 0.000 claims abstract description 145
- 238000004140 cleaning Methods 0.000 claims abstract description 97
- 239000007788 liquid Substances 0.000 claims abstract description 97
- 230000007246 mechanism Effects 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005188 flotation Methods 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 claims 2
- 238000007781 pre-processing Methods 0.000 claims 1
- 239000010865 sewage Substances 0.000 abstract description 16
- 238000005516 engineering process Methods 0.000 abstract description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 14
- 239000012535 impurity Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 10
- 239000000243 solution Substances 0.000 description 7
- 235000011187 glycerol Nutrition 0.000 description 6
- 239000012670 alkaline solution Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/12—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
- B08B1/32—Cleaning by methods involving the use of tools by movement of cleaning members over a surface using rotary cleaning members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The utility model relates to a waste plastic recycling and processing pretreatment system, which comprises a washing mechanism and a liquid conveying mechanism, wherein the washing mechanism comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, the plurality of washing units are sequentially arranged, two adjacent washing units are communicated through the material moving units so as to form a plastic conveying channel, the plurality of collecting units are arranged in one-to-one correspondence with the plurality of washing units and are used for collecting cleaning liquid discharged when the plurality of washing units convey plastic outwards, the liquid conveying mechanism comprises a plurality of return pipes, any return pipe is communicated with one collecting unit and the previous washing unit, and the cleaning liquid discharged by the current washing unit is returned to the previous washing unit for gradient utilization; solves the problems of serious water resource consumption and large sewage discharge amount and high sewage treatment pressure when plastic is conveyed among different washing units in the existing waste plastic recycling and processing pretreatment technology.
Description
Technical Field
The utility model relates to the technical field of waste plastic recovery, in particular to a waste plastic recovery processing pretreatment system.
Background
With the development of industrial level, plastic products are widely utilized, and more waste plastics are generated, so that the disposal of the waste plastics is always a great difficulty facing the human society, the recycling of the waste plastics is an important way for solving the problem, the recycling of the waste plastics not only can protect the environment, but also saves resources, the waste plastics are recycled and need to be subjected to the pretreatment such as crushing, cleaning, dewatering, sorting and the like, and then are processed and manufactured into the regenerated plastic particles, and the waste plastics are manufactured into new products by the reprocessing of the regenerated plastic particles, so that the waste plastics can be reused.
In the actual production process, dust, dry glue, greasy dirt and the like are often adhered to the recycled waste plastics, paper scraps, metals and other impurities are mixed among the waste plastics sometimes, and the impurities influence the quality of subsequent granulation processing, so that the recycled plastics need to be cleaned before the granulation processing, because the impurities are different in types, when the impurities are removed, the recycled plastics need to be cleaned, for example, the Chinese patent application No. CN202122923569.3 is provided, a plastic regeneration crushing cleaning system is provided, which comprises a conveyor, a shredder, a friction cleaner, a water washing impurity removing tank, an alkaline washing tank, a hot air drying conveying device, a label separator and a storage bin which are sequentially connected, and the impurities such as metals, labels and greasy dirt in the plastics are removed through repeated cleaning and label removing treatment, so that plastic particles with higher purity can be obtained in the subsequent granulation processing process.
Therefore, in the existing waste plastic recycling and processing pretreatment technology, when plastic is conveyed among different washing units, the problems of serious water resource consumption and large sewage discharge amount and high sewage treatment pressure exist.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a pretreatment system for recycling waste plastics, which is used for solving the problems of serious water resource consumption and large sewage discharge amount and high sewage treatment pressure when plastics are conveyed among different washing units.
The utility model provides a waste plastic recycling and processing pretreatment system which comprises a washing mechanism and a liquid conveying mechanism, wherein the washing mechanism comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, the plurality of washing units are sequentially arranged, two adjacent washing units are communicated through the material moving units so as to form a plastic conveying channel, the plurality of collecting units are arranged in one-to-one correspondence with the plurality of washing units and are used for collecting cleaning liquid discharged when the plurality of washing units convey plastic outwards, the liquid conveying mechanism comprises a plurality of return pipes, any one return pipe is communicated with one collecting unit and the previous washing unit, and the cleaning liquid discharged by the current washing unit is returned to the previous washing unit for gradient utilization.
Further, the washing unit is provided with three, and three washing unit is flotation tank, alkaline washing pond and rinsing pond respectively, flotation tank, alkaline washing pond and rinsing pond all rotate along plastic conveying direction's both ends and are provided with a stirring and push away the flow device, stirring and push away the flow device and include pivot and paddle, the pivot perpendicular with plastic's conveying direction sets up, the axis of pivot be located rather than the washing liquid level and level in the cell body, the paddle is followed the axis direction of pivot is fixed in the pivot, the paddle is followed the pivot rotates, so as to promote the washing liquid to flow towards plastic conveying direction.
Further, one ends of the flotation tank, the alkaline washing tank and the rinsing tank, which are used for discharging plastics, are respectively fixedly provided with a chute, two ends of each chute are respectively provided with an opening, one end of each chute is flush with the upper surfaces of the flotation tank, the alkaline washing tank or the rinsing tank, and the other end of each chute extends downwards.
Further, a plurality of brushes are rotatably arranged in the alkaline washing tank along the vertical direction, the brushes are distributed into two rows along the conveying direction of plastics, the two rows of brushes are respectively close to two opposite inner walls of the alkaline washing tank, the bristles of the two rows of brushes are arranged in a staggered manner, the conveying path of the plastics passes through a gap between the two rows of brushes, the rotation directions of the two rows of brushes are opposite, and cleaning liquid between the two rows of brushes flows along the direction of the plastic conveying by pushing the brushes.
Further, a support is fixedly arranged on the alkaline washing tank, a motor for driving the hairbrushes to rotate is fixedly arranged on the support, the motor is arranged in one-to-one correspondence with the hairbrushes, a rotating shaft of the motor penetrates through the support, and the rotating shaft of the motor is coaxially fixed with the hairbrushes.
Further, two the guiding gutter is all fixed to be provided with in the below of guipure conveyer, two the washing liquid that guipure conveyer separated falls into respectively in two guiding gutters move the material unit and be provided with two, two move the material unit and be guipure conveyer, the conveyer belt of guipure conveyer porous setting, and the aperture is less than the particle diameter setting of plastics, the conveyer belt of guipure conveyer is fixed to be provided with a plurality of rising material baffles that are used for blockking plastics gliding.
Furthermore, a diversion trench is fixedly arranged below the two mesh belt conveyors, and cleaning liquid separated by the two mesh belt conveyors falls into the two diversion trenches respectively.
Further, the collection unit is provided with three, and three the collection unit sets up into first buffer tank, second buffer tank and third buffer tank respectively, first buffer tank with the second buffer tank respectively with two guiding gutter intercommunication sets up, the third buffer tank with the intercommunication is provided with a centrifugal drier between the rinsing pond, centrifugal drier is used for separating plastics and the washing liquid of rinsing in the pond, and will wash the liquid and discharge into in the third buffer tank.
Further, two return pipes are arranged, the two return pipes are a first return pipe and a second return pipe respectively, the first return pipe is communicated with the third buffer tank and the alkaline washing tank, the second return pipe is communicated with the second buffer tank and the flotation tank, and a return pump is fixedly arranged on the first return pipe and the second return pipe.
Further, the liquid conveying mechanism further comprises a wastewater treatment device and a water inlet pipe, wherein the wastewater treatment device is communicated with the first cache tank, and the water inlet pipe is communicated with the rinsing pool.
Compared with the prior art, the waste plastic recycling and processing pretreatment system provided by the utility model has the advantages that broken plastic is cleaned for multiple times through the arrangement of the washing structure, so that impurities and attachments in the plastic are removed, and meanwhile, through the arrangement of the liquid conveying mechanism, the cleaning liquid discharged by the washing structure is utilized in a gradient manner, so that the consumption of water resources and the discharge of the cleaning liquid are reduced, and the sewage treatment pressure is reduced; specifically, the washing mechanism comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, wherein the plurality of washing units are sequentially arranged, two adjacent washing units are communicated through the material moving units to form a plastic conveying channel, the plurality of collecting units are in one-to-one correspondence with the plurality of washing units, cleaning liquid discharged when different washing units are used for conveying plastic outwards is respectively collected, the liquid conveying mechanism comprises a plurality of return pipes, any return pipe is communicated with the current collecting unit and the previous washing unit, and the cleaning liquid collected in the collecting units is returned to the previous washing unit for gradient utilization, so that the purposes of reducing water resource consumption and sewage discharge are achieved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an embodiment of a pretreatment system for recycling waste plastics;
FIG. 2 is a schematic diagram of an alkaline washing tank in an embodiment of a pretreatment system for recycling waste plastics;
FIG. 3 is a schematic diagram of a mesh belt conveyor in an embodiment of the pretreatment system for recycling waste plastics;
fig. 4 is a schematic flow diagram of a cleaning solution in an embodiment of a pretreatment system for recycling waste plastics.
In the figure: 1. a washing mechanism; 2. a liquid delivery mechanism; 11. a flotation cell; 12. an alkaline washing pool; 13. a rinsing pool; 14. a mesh belt conveyor; 15. a first buffer tank; 16. a second buffer tank; 17. a third buffer tank; 171. a centrifugal drier; 21. a first return pipe; 22. a second return pipe; 18. a stirring plug flow device; 181. a rotating shaft; 182. a paddle; 19. a chute; 121. a brush; 122. a bracket; 123. a motor; 141. a conveyor belt; 142. a material lifting baffle; 143. a diversion trench; 23. a reflux pump; 24. a sewage treatment device; 25. a water inlet pipe.
Detailed Description
Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the utility model, and are not intended to limit the scope of the utility model.
As shown in fig. 1, a pretreatment system for recycling waste plastics in this embodiment includes a washing mechanism 1 and a liquid conveying mechanism 2, the washing mechanism 1 includes a plurality of washing units, a plurality of material transferring units and a plurality of collecting units, the plurality of washing units are sequentially arranged, two adjacent washing units are communicated with each other through the material transferring units so as to form a channel for conveying plastics, the plurality of collecting units are arranged in one-to-one correspondence with the plurality of washing units so as to collect cleaning liquid discharged when the plurality of washing units convey plastics outwards, the liquid conveying mechanism 2 includes a plurality of return pipes, any return pipe is communicated with one collecting unit and a previous washing unit, and the cleaning liquid discharged by the current washing unit is returned to the previous washing unit for cascade utilization.
The washing mechanism 1 is a mechanism for washing broken plastics for multiple times and comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, wherein the washing units are used for carrying out multistage washing on the plastics so as to remove different impurities and attachments on the surfaces of the plastics, the material moving units are used for completing plastic conveying among different washing units, two adjacent washing units are communicated through the material moving units so as to form a plastic conveying channel, the collecting units are used for collecting cleaning liquid discharged by the washing units, the collecting units are provided with a plurality of collecting units, and the collecting units are arranged in one-to-one correspondence with the washing units so as to collect the cleaning liquid discharged by the different washing units in a distinguishing manner; the liquid conveying mechanism 2 is used for conveying cleaning liquid to a plurality of washing units, the liquid conveying mechanism 2 comprises a plurality of return pipes, any one return pipe is communicated with one collecting unit and the last washing mechanism 1 corresponding to the collecting unit, so that the cleaning liquid discharged from the current washing mechanism 1 is returned to the last washing mechanism 1 for gradient utilization, the cleaning liquid is prevented from being continuously replenished into the plurality of washing units, the consumption of water resources is reduced, the discharge amount of the cleaning liquid discharged from the whole washing mechanism 1 to the outside is reduced, and the pressure of sewage treatment is reduced.
In the present embodiment, the washing mechanism 1 is a mechanism for continuously washing the crushed plastic a plurality of times, and the plastic is subjected to a plurality of washing steps in a continuous conveying process to remove impurities mixed in the plastic and attachments on the surface of the plastic, and in order to improve the washing effect of the washing mechanism 1, the washing mechanism 1 is modified in the following embodiments.
In order to better remove impurities and attachments, in a preferred embodiment, as shown in fig. 1-2, three washing units are provided, wherein the three washing units are respectively a flotation tank 11, an alkaline washing tank 12 and a rinsing tank 13, two ends of the flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13 along the plastic conveying direction are respectively provided with a stirring and pushing device 18 in a rotating mode, the stirring and pushing device 18 comprises a rotating shaft 181 and a paddle 182, the rotating shaft 181 is perpendicular to the plastic conveying direction, the axis of the rotating shaft 181 is positioned at the level with the liquid level of the cleaning liquid in the tank where the rotating shaft 181 is positioned, the paddle 182 is fixed on the rotating shaft 181 along the axis direction of the rotating shaft 181, and the paddle 182 rotates along with the rotating shaft 181 to push the cleaning liquid to flow towards the plastic conveying direction.
The flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13 are all of a rectangular tank structure, two end surfaces of the flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13 are respectively provided with a feeding end and a discharging end, the stirring and pushing device 18 arranged at the feeding end can break up plastics falling into the feeding end and press the plastics into the cleaning liquid, so that the plastics are fully mixed into the cleaning liquid, the cleaning effect on the plastics is improved, the stirring and pushing device 18 arranged at the discharging end can throw out the plastics nearby the alkaline washing tank 12 from the tank body through the rotation of the blade 182, the plastics enter the separating and conveying mechanism for conveying, and meanwhile, the stirring and pushing device 18 in the embodiment rotates towards the conveying direction of the plastics so as to push the cleaning liquid to flow towards the specified conveying direction.
It will be appreciated that the arrangement of the washing unit in this embodiment is a preferred embodiment, and other washing units may be added to enhance the cleaning effect.
It should be noted that, in the initial state, the cleaning solution in the flotation tank 11 and the rinsing tank 13 is clean water, the cleaning solution in the alkaline cleaning tank 12 is heated alkaline solution, when the alkaline solution is used for cleaning greasy dirt, the alkaline solution can react with the greasy dirt to generate saponified material and glycerin, under the action of the saponified material and glycerin, the cleaning effect on other attachments such as glue stain is enhanced, along with the operation of the whole waste plastic recycling pretreatment system, most of the alkaline solution containing the saponified material and glycerin discharged from the alkaline cleaning tank 12 enters the flotation tank 11 along with the second return pipe 22, the cleaning effect in the flotation tank 11 is enhanced, the water discharged from the flotation tank 11 enters the alkaline cleaning tank 12 to supplement the liquid in the alkaline cleaning tank 12, and during the long-term operation of the waste plastic recycling pretreatment system, workers can be arranged to supplement alkaline to the alkaline cleaning tank 12 and supplement the rinsing tank 13 to maintain the alkaline concentration in the alkaline cleaning tank 12 and the cleaning water amount in the rinsing tank 13.
In order to facilitate the discharge of the plastics in the washing mechanism 1 onto the separation and conveying mechanism, in a preferred embodiment, as shown in fig. 1, a chute 19 is fixedly arranged at one end of the flotation tank 11, the alkaline washing tank 12 and one end of the rinsing tank 13 for discharging the plastics, both ends of the chute 19 are opened, one end of any chute 19 is flush with the upper surface of the flotation tank 11, the alkaline washing tank 12 or the rinsing tank 13, and the other end extends downwards.
The chute 19 plays a good guiding role, prevents plastics and cleaning liquid from scattering outside the waste plastic recycling and processing pretreatment system, and ensures the stability of the plastic litigation process.
In order to further remove the attachments on the plastic, in a preferred embodiment, as shown in fig. 1-2, a plurality of brushes 121 are rotatably disposed in the alkaline washing tank 12 along a vertical direction, the plurality of brushes 121 are distributed in two rows along a conveying direction of the plastic, the two rows of brushes 121 are disposed near two opposite inner walls of the alkaline washing tank 12, the bristles of the two rows of brushes 121 are disposed alternately with each other, a conveying path of the plastic is disposed through a gap between the two rows of brushes 121, the rotation directions of the two rows of brushes 121 are opposite, and the cleaning liquid between the two rows of brushes 121 is pushed to flow toward the conveying direction of the plastic via the brushes 121.
Wherein, the plastics in the alkaline washing tank 12 pass through the gap between the two rows of brushes 121 along with the cleaning liquid flowing from the feeding end to the discharging end, so that the brushes 121 are used for brushing the surfaces of the plastics, and the intractable attachments on the surfaces of the plastics can be effectively removed under the action of saponified matters and glycerin in the alkali liquor, and the two rows of brushes 121 are rotatably arranged towards the flowing direction of the cleaning liquid between the two rows of brushes 121, so as to avoid obstructing the transportation of the plastics in the alkaline washing tank 12.
In order to install the brush 121, in a preferred embodiment, as shown in fig. 1, a support 122 is fixedly provided on the alkaline washing tub 12, a motor 123 for driving the brush 121 to rotate is fixedly provided on the support 122, the motor 123 is arranged in one-to-one correspondence with the brush 121, a rotation shaft of the motor 123 is arranged through the support 122, and a rotation shaft of the motor 123 is coaxially fixed with the brush 121.
Wherein, the bracket 122 mainly plays a role in installing the brush 121 and the motor 123, and provides a stable installation position for the brush 121 and the motor 123, and the shape and structure of the bracket 122 can be adjusted according to the actual use requirement, so long as the installation of other components is not hindered.
In order to separate the plastic from the cleaning solution better, in a preferred embodiment, as shown in fig. 1 and 3, two material moving units are provided, wherein two material moving units are respectively a mesh belt type conveyor 14, a conveyor belt 141 of the mesh belt type conveyor 14 is arranged in a porous manner, the aperture is smaller than the particle size of the plastic, and a plurality of material lifting baffles 142 for blocking the plastic from sliding down are fixedly arranged on the conveyor belt 141 of the mesh belt type conveyor 14.
The mesh belt conveyor 14 separates the cleaning liquid together with the plastic while conveying the plastic to avoid polluting the cleaning liquid of the next-stage cleaning device, and the lifting baffle 142 is perpendicular to the outer side surface of the conveyor belt 141 and is used for limiting the plastic to slide relative to the conveyor belt 141 in the transmission process of the conveyor belt 141, so that the plastic can be conveyed more stably.
It will be appreciated that the present embodiment provides for separation of the cleaning liquid from the plastic by the meshed conveyor 141, and that other separation conveying devices may be used in other ways instead of the mesh belt conveyor 14 of the present embodiment, such as a meshed screw conveyor, to provide the above-described separation of the cleaning liquid from the plastic.
In a preferred embodiment, as shown in fig. 3, a diversion trench 143 is fixedly arranged below each of the two mesh belt conveyors 14, and the cleaning liquid separated from the two mesh belt conveyors 14 falls into the two diversion trenches 143 respectively.
It will be appreciated that the cleaning liquid separated and dropped from the conveyor 141 flows into the flow guide groove 143, is collected by the flow guide groove 143, and is discharged.
In order to facilitate collection of the cleaning solution, in a preferred embodiment, as shown in fig. 1, three collection units are provided, and the three collection units are respectively provided as a first buffer tank 15, a second buffer tank 16 and a third buffer tank 17, wherein the first buffer tank 15 and the second buffer tank 16 are respectively communicated with two diversion trenches 143, a centrifugal dryer 171 is provided between the third buffer tank 17 and the rinsing tank 13, and the centrifugal dryer 171 is used for separating the plastic discharged from the rinsing tank 13 from the cleaning solution and discharging the cleaning solution into the third buffer tank 17.
The first buffer tank 15, the second buffer tank 16 and the third buffer tank 17 are respectively used for collecting the washing liquid discharged from the flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13, the plastics in the rinsing tank 13 enter the centrifugal drier 171 through the chute 19 when discharged, the cleaning liquid separated by the centrifugal drier 171 enters the third buffer tank 17 for recycling, and the plastics dehydrated by the centrifugal drier 171 can be used for granulation processing.
In this embodiment, the liquid conveying mechanism 2 is used for conveying and outputting the cleaning liquid into the washing mechanism 1 to maintain the stability of the liquid level of the cleaning liquid in the washing mechanism, and is also used for recycling the cleaning liquid discharged from the washing mechanism 1 to reduce the waste of water resources.
In order to facilitate the delivery of the cleaning liquid, two return pipes are arranged, namely a first return pipe 21 and a second return pipe 22, wherein the first return pipe 21 is communicated with the third buffer tank 17 and the alkaline washing tank 12, the second return pipe 22 is communicated with the second buffer tank 16 and the flotation tank 11, and return pumps 23 are fixedly arranged on the first return pipe 21 and the second return pipe 22.
Wherein, by arranging the reflux pump 23, the cleaning liquid in the second buffer tank 16 and the third buffer tank 17 can be respectively conveyed into the flotation tank 11 and the alkaline cleaning tank 12.
In order to keep the liquid level in the flotation tank 11 and the rinsing tank 13 stable, in a preferred embodiment, as shown in fig. 1 and 4, the liquid transfer mechanism 2 further comprises a wastewater treatment device in communication with the first buffer tank 15 and a water inlet pipe 25, the water inlet pipe 25 being in communication with the rinsing tank 13.
The waste plastic recycling and processing pretreatment system only has one liquid inlet end and one liquid outlet end, the liquid inlet end is a water inlet pipe 25 and is used for supplementing clean water to the rinsing tank 13, the liquid outlet end is a wastewater treatment device and is used for treating cleaning liquid discharged from the flotation tank 11, and the cleaning liquid discharged from the alkaline washing tank 12 and the rinsing tank 13 is respectively recycled to the flotation tank 11 and the alkaline washing tank 12 for recycling, so that the waste of water resources is reduced, the discharge amount of sewage is also reduced, the pressure of sewage treatment is reduced, and meanwhile, the cleaning liquid in the flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13 is continuously circulated, so that the reduction of cleaning effects caused by continuous increase of impurities in the flotation tank 11, the alkaline washing tank 12 and the rinsing tank 13 is avoided.
Compared with the prior art: the waste plastic recycling and processing pretreatment system provided by the utility model has the advantages that the crushed plastic is cleaned for multiple times through the arrangement of the washing structure, so that impurities and attachments in the plastic are removed, and meanwhile, the cleaning liquid discharged by the washing structure is utilized in a gradient manner through the arrangement of the liquid conveying mechanism 2, so that the consumption of water resources and the discharge of the cleaning liquid are reduced, and the sewage treatment pressure is reduced; specifically, the washing mechanism 1 comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, the plurality of washing units are sequentially arranged, two adjacent washing units are communicated through the material moving units to form a plastic conveying channel, the plurality of collecting units are arranged in one-to-one correspondence with the plurality of washing units, the cleaning liquid discharged when different washing units convey plastics outwards is respectively collected, the liquid conveying mechanism 2 comprises a plurality of return pipes, any one return pipe is communicated with the current collecting unit and the previous washing unit, and the cleaning liquid collected in the collecting unit is returned to the previous washing unit for gradient utilization, so that the purposes of reducing water resource consumption and reducing sewage discharge are achieved;
meanwhile, the cleaning liquid in different cleaning devices can be replaced gradually through the water inlet pipe 25, the first return pipe 21, the second return pipe 22 and the sewage treatment device 24, the cleaning liquid discharged when the plastic is conveyed by the rinsing tank 13 is discharged into the alkaline cleaning tank 12 through the first return pipe 21 so as to supplement the lost cleaning liquid in the alkaline cleaning tank 12, meanwhile, the cleaning liquid lost in the rinsing tank 13 is supplemented through the water inlet pipe 25, the cleaning liquid discharged when the plastic is conveyed by the alkaline cleaning tank 12 is discharged into the flotation tank 11 through the second return pipe 22, the cleaning liquid discharged in the alkaline cleaning tank 12 is alkaline solution containing glycerol and saponified matters, the cleaning effect of the flotation tank 11 can be improved, the cleaning liquid discharged when the plastic is conveyed by the flotation tank 11 is subjected to purification treatment through the sewage treatment device 24, so that the cleaning liquid in the flotation tank 11, the alkaline cleaning tank 12 and the rinsing tank 13 is dynamically balanced, the continuous replacement effect of the cleaning liquid is realized, and the continuous increase of impurities in the flotation tank 11, the alkaline cleaning tank 12 and the rinsing tank 13 is avoided, and the cleaning effect is reduced;
on the other hand, the brush 121 for washing plastics is arranged in the alkaline washing tank 12, and glycerol and saponified matters produced by the reaction of alkali liquor and greasy dirt in the alkaline washing tank 12 can easily remove water-insoluble attachments on the surface of plastics under the action of the brush 121, so that the washing effect on the plastics is improved, and the pelleting processing quality of the later-stage plastics is not affected.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (6)
1. The waste plastic recycling and processing pretreatment system is characterized by comprising a washing mechanism and a liquid conveying mechanism;
the washing mechanism comprises a plurality of washing units, a plurality of material moving units and a plurality of collecting units, wherein the plurality of washing units are sequentially arranged, two adjacent washing units are communicated through the material moving units so as to form a channel for conveying plastics, and the plurality of collecting units are arranged in one-to-one correspondence with the plurality of washing units and are used for collecting cleaning liquid discharged when the plurality of washing units convey plastics outwards; the device comprises a washing unit, a stirring and pushing device and a stirring and pushing device, wherein the three washing units are respectively a flotation tank, an alkaline washing tank and a rinsing tank, the two ends of the flotation tank, the alkaline washing tank and the rinsing tank along the plastic conveying direction are respectively provided with the stirring and pushing device in a rotating mode, the stirring and pushing device comprises a rotating shaft and a paddle, the rotating shaft is perpendicular to the plastic conveying direction, the axis of the rotating shaft is level with the liquid level of cleaning liquid in the tank where the rotating shaft is located, the paddle is fixed on the rotating shaft along the axis direction of the rotating shaft, and the paddle rotates along with the rotating shaft so as to push the cleaning liquid to flow towards the plastic conveying direction; the three collecting units are respectively arranged into a first cache tank, a second cache tank and a third cache tank, a centrifugal drier is arranged between the third cache tank and the rinsing pool in a communicated mode, and the centrifugal drier is used for separating plastics and cleaning liquid discharged from the rinsing pool and discharging the cleaning liquid into the third cache tank; one end of the flotation tank, the alkaline washing tank and one end of the rinsing tank, which are used for discharging plastics, are respectively fixedly provided with a chute, two ends of each chute are respectively provided with an opening, one end of any chute is flush with the upper surface of the flotation tank, the alkaline washing tank or the rinsing tank, and the other end of any chute extends downwards;
the liquid conveying mechanism comprises a plurality of return pipes, any one of the return pipes is communicated with one collecting unit and the washing unit at the previous stage, and the cleaning liquid discharged by the current washing unit is returned to the previous washing unit for gradient utilization; the two return pipes are respectively a first return pipe and a second return pipe, the first return pipe is communicated with the third buffer tank and the alkaline washing tank, the second return pipe is communicated with the second buffer tank and the flotation tank, and the first return pipe and the second return pipe are fixedly provided with return pumps.
2. The system according to claim 1, wherein a plurality of brushes are rotatably arranged in the alkaline washing tank in a vertical direction, the plurality of brushes are distributed in two rows along a plastic conveying direction, the two rows of brushes are respectively arranged close to two opposite inner walls of the alkaline washing tank, the bristles of the two rows of brushes are mutually staggered, a plastic conveying path is arranged through a gap between the two rows of brushes, the rotation directions of the two rows of brushes are opposite, and cleaning liquid between the two rows of brushes is pushed to flow towards a plastic conveying direction by the brushes.
3. The waste plastic recycling and processing pretreatment system according to claim 2, wherein a bracket is fixedly arranged on the alkaline washing tank, a motor for driving the hairbrush to rotate is fixedly arranged on the bracket, the motor is arranged in one-to-one correspondence with the hairbrush, a rotating shaft of the motor penetrates through the bracket, and the rotating shaft of the motor is coaxially fixed with the hairbrush.
4. A waste plastic recycling and pre-processing system according to any one of claims 1-3, wherein two material moving units are arranged, two material moving units are mesh belt type conveyors, the conveyor belt of each mesh belt type conveyor is arranged in a porous mode, the aperture of each conveyor belt is smaller than the particle size of plastic, and a plurality of material lifting baffles for blocking plastic from sliding downwards are fixedly arranged on the conveyor belt of each mesh belt type conveyor.
5. The pre-treatment system for recycling and processing waste plastics according to claim 4, wherein a diversion trench is fixedly arranged below each of the two mesh belt conveyors, and cleaning liquid separated by the two mesh belt conveyors falls into the two diversion trenches respectively.
6. The pre-treatment system for recycling waste plastic according to claim 5, wherein the liquid conveying mechanism further comprises a waste water treatment device and a water inlet pipe, the waste water treatment device is communicated with the first buffer tank, and the water inlet pipe is communicated with the rinsing tank.
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| CN202211109969.3A CN115463887B (en) | 2022-09-13 | 2022-09-13 | Waste plastic recycling and processing pretreatment system |
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| CN202211109969.3A CN115463887B (en) | 2022-09-13 | 2022-09-13 | Waste plastic recycling and processing pretreatment system |
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| CN115463887A (en) | 2022-12-13 |
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