CN115742078A

CN115742078A - Waste plastic recycling and granulating device and method

Info

Publication number: CN115742078A
Application number: CN202211476126.7A
Authority: CN
Inventors: 严俊; 李德峰; 梁远通
Original assignee: Wanlvda Tianjin Renewable Resources Utilization Co ltd
Current assignee: Wanlvda Tianjin Renewable Resources Utilization Co ltd
Priority date: 2022-11-23
Filing date: 2022-11-23
Publication date: 2023-03-07
Anticipated expiration: 2042-11-23
Also published as: CN115742078B

Abstract

The application relates to a waste plastic recycling and granulating device and method, relates to the field of waste plastic treatment, and comprises a crushing tank, a washing tank arranged below the crushing tank and a melting tank arranged below the washing tank, wherein the crushing tank, the washing tank and the melting tank are integrally formed and the central axes of the crushing tank, the washing tank and the melting tank are coincided. Be provided with crushed aggregates subassembly in the crushed aggregates jar, wash and be provided with in the material jar and wash subassembly and drainage subassembly, the plastic products that get into in the crushed aggregates jar is chopped up by the crushed aggregates subassembly and forms the plastic chip, and the plastic chip gets into and cleans under the effect of the intrinsic washing subassembly of material jar of washing, and the sewage that will wash in the material jar by drainage subassembly after the cleanness is accomplished is discharged, and then melts in the clean plastic chip entering melt jar of accomplishing. The same device is used in multiple processes, collection and transfer to the next process are not needed after each process is finished, and the working efficiency is remarkably improved.

Description

Waste plastic recycling and granulating device and method

Technical Field

The application relates to the field of waste plastic treatment, in particular to a waste plastic recycling and granulating device and method.

Background

The plastic has the advantages of light weight, high strength, easiness in processing, low cost and the like, is widely applied in life, has the characteristics of corrosion resistance, difficulty in decomposition and the like, and can generate serious white pollution and cause serious damage to the living environment of people because waste plastic products are discarded at will and are not treated. Therefore, the recycling of the waste plastics is extremely important, the influence of the waste plastics on the environment can be reduced by recycling the waste plastics, and the recycling method is also an important measure for sustainable development. The method for recycling the waste plastics has the modes of melting regeneration, chemical modification, thermal cracking and the like, and meanwhile, the plastic regenerated product manufactured by recycling the waste plastics also has wide sales prospect.

In the related art, waste plastics are granulated after being recycled, and the regenerated granules produced by granulation can be used for processing and molding various plastic products. In the granulation process of the waste plastic, firstly, the plastic products are sorted manually, secondly, the sorted plastic products are cut and crushed by using a crusher, secondly, the cut plastic fragments are cleaned and dried, secondly, the clean and dry plastic fragments are melted into thick substances by using an electric heating melting machine, the thick substances are extruded from the electric heating melting machine and cooled, and finally, the cooled and shaped regenerated plastic is granulated by using a granulator, so that regenerated plastic particles are obtained.

In view of the above-mentioned related art, the inventor thinks that in the granulation process, the waste plastics are treated by using a plurality of sets of equipment, the occupied space is large, and after each piece of equipment is processed, the plastic products need to be stored and then transferred to the next piece of equipment, thereby resulting in low overall working efficiency.

Disclosure of Invention

In order to save space and improve the efficiency of granulation operation, the application provides a waste plastic recycling and granulating device and method.

The application provides a waste plastic recycling and granulating device and a waste plastic recycling and granulating method, which adopt the following technical scheme:

a waste plastic recycling and granulating device comprises a crushing tank, a washing tank arranged below the crushing tank and a melting tank arranged below the washing tank, wherein the crushing tank, the washing tank and the melting tank are integrally formed and are coincided with each other in the central axis;

the plastic product crushing device comprises a crushing tank, a feeding hole, a crushing component, a driving component and a plurality of through holes, wherein the crushing tank is provided with the feeding hole;

the washing tank is provided with a water inlet and a water outlet, a cleaning assembly and a drainage assembly are arranged in the washing tank, the driving assembly is further used for driving the cleaning assembly to clean plastic fragments falling from the crushed material tank, the drainage assembly is used for discharging waste water after cleaning is completed, a feed opening is formed in the bottom of the washing tank, and an electric control valve is arranged on the inner side wall of the feed opening;

the plastic fragments that the washing was accomplished pass through the feed opening gets into in the melt jar, be provided with the discharge gate on the melt jar.

Through adopting above-mentioned technical scheme, crushed aggregates jar, washing material jar and melting jar integrated into one piece set up, practice thrift the space, and plastic products are broken by the crushed aggregates subassembly in the crushed aggregates jar in proper order man-hour, clean by washing the subassembly in washing the material jar after that, get into at last in the melting jar and heat and melt, and multiple process uses same device, need not collect after every process is accomplished and transport to next process, and work efficiency is showing and is promoting.

Optionally, the crushing assembly includes an installation shaft vertically arranged in the crushing tank, a crushing rod arranged on the installation shaft, and a blade arranged on the crushing rod; the driving assembly comprises a driving motor and a driving shaft fixedly connected to an output shaft of the driving motor, and the mounting shaft is sleeved on the driving shaft.

Through adopting above-mentioned technical scheme, after plastic products got into in the crushed aggregates jar, the installation axle rotated under the drive of output shaft, and the crushed aggregates pole rotates simultaneously, and the blade on the crushed aggregates pole becomes plastic chip with plastic products cutting to subsequent processing.

Optionally, the bits of broken glass pole be in the crisscross a plurality of that is provided with on the installation axle, just the blade all is provided with a plurality ofly on the week side of every bits of broken glass pole.

Through adopting above-mentioned technical scheme, crisscross crushed aggregates pole and the setting of a plurality of blades can diversely cut plastic products, and the plastics piece after making the cutting is more even simultaneously.

Optionally, the washing subassembly includes the pivot, set up in change epaxial installation piece and set up in connecting rod on the installation piece, the bottom plate of washing material jar with the lateral wall of washing material jar rotates to be connected, the bottom of pivot with the bottom plate fixed connection of washing material jar, the top of pivot with drive shaft fixed connection.

Through adopting above-mentioned technical scheme, the pivot rotates the bottom plate that drives the washing tank and rotates to wash rivers formation swirl in the material jar and clean plastic debris, the connecting rod stirs plastic debris simultaneously, makes plastic debris's cleaning performance better.

Optionally, the drainage assembly comprises a filter plate arranged on the inner side wall of the water outlet and a baffle fixedly connected to the connecting rod, and the baffle abuts against the inner side wall of the washing tank and is used for opening and closing the water outlet; be provided with two-way screw on the periphery side of pivot, installation piece threaded connection in the pivot, be provided with the guide bar in the washing material jar, the guide bar is electric telescopic handle, electric telescopic handle's stiff end set firmly in the bottom of bits of broken glass jar, electric telescopic handle's flexible end with the middle part fixed connection of connecting rod.

Through adopting above-mentioned technical scheme, wash the plastics piece in the material jar and wash after finishing, drive shaft antiport, and then pivot antiport, installation piece along pivot rebound for the delivery port is kept away from gradually in the baffle upward movement, thereby the delivery port is opened and is discharged water, and sewage exhaust in-process filter filters the plastics piece, prevents that the plastics piece from discharging along with sewage.

Optionally, a ratchet assembly is further disposed in the material crushing tank, the ratchet assembly is disposed between the mounting shaft and the driving shaft, and the ratchet assembly is used for controlling the mounting shaft to stop rotating when the driving shaft rotates reversely.

Through adopting above-mentioned technical scheme, when pivot antiport was opened and is carried out the drainage, during pivot antiport promptly, the installation axle can not continue to rotate along with the pivot, can not continue promptly to carry out the breakage to plastic products to can not continue to carry out the crushed aggregates in the crushed aggregates jar and lead to the fact the influence to the drainage in the washing material jar.

Optionally, the ratchet subassembly including set up in install epaxial ratchet in the axle inside wall, the dress caulking groove has been seted up on the drive shaft, the ratchet subassembly still including set up in pawl, telescopic link and the spring in the dress caulking groove, the pawl rotate set up in the dress caulking groove, the telescopic shaft of telescopic link with the middle part of pawl is articulated, the spring housing is located on the output shaft of telescopic link, the telescopic link is used for ordering about the pawl is to keeping away from the direction motion of dress caulking groove bottom.

By adopting the technical scheme, the plastic fragments are cleaned by the material washing tank while the materials are crushed in the material crushing tank, at the moment, the output shaft of the driving motor rotates in the positive direction, the telescopic rod drives the pawl to move in the direction far away from the bottom of the embedding groove, the pawl is meshed with the ratchet of the ratchet wheel, and the mounting shaft rotates under the driving of the driving shaft; on the contrary, when the output shaft of the driving motor rotates reversely, the pawl retracts into the embedding groove, the driving shaft has no acting force on the mounting shaft, but still drives the rotating shaft to rotate, so that the crushing assembly stops crushing the plastic products, and the drainage assembly starts to drain water.

Optionally, still include the stirring subassembly, the stirring subassembly including rotate set up in the bull stick in the melt pot with set up in the bull stick week side on the puddler, the top of bull stick with pivot fixed connection.

Through adopting above-mentioned technical scheme, the stirring subassembly stirs the plastic chip for the plastic chip is heated evenly, melts the thick thing that forms afterwards and is more even.

Optionally, a guide inclined plane is arranged on the inner side wall of the feed opening.

Through adopting above-mentioned technical scheme, the process that the plastics piece got into the feed opening is more smooth.

Optionally, the granulation method based on the waste plastic recovery device includes:

s1, putting a plastic product into the crushing tank from the feeding hole, and driving the crushing assembly to crush the plastic product into plastic fragments by the driving assembly;

s2, enabling plastic fragments to enter the washing tank through the through hole, driving the bottom plate of the washing tank to rotate by the driving assembly, enabling water flow in the washing tank to form a vortex and then cleaning the plastic fragments, and discharging waste water by using the drainage assembly after cleaning is finished;

s3, the cleaned plastic fragments enter the melt tank through the feed opening, the plastic fragments are melted under the heating of the melt tank, and the melted thick substances are discharged from the discharge opening;

s4, extruding and molding the melted plastic thick substance through a mold, and cooling and shaping the plastic thick substance through a cooling system to form hard strip-shaped plastic;

and S5, cutting the hard strip-shaped plastic by a cutting machine to obtain regenerated plastic particles.

Through adopting above-mentioned technical scheme, after plastic products got into the garrulous material jar, loop through washing material jar and melt jar and process into plastics thick form thing, garrulous material jar, washing material jar and melt jar integrated into one piece set up, practice thrift the space and improved work efficiency simultaneously, the crushed aggregates subassembly carries out even breakage to plastic products, it carries out the degree of depth cleanness to wash the material subassembly to the plastic fragments, the melt subassembly melts the plastic fragments fully evenly to the plastics thick form thing quality of last production is better, the regeneration plastic granules quality that forms from this processing is good.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after being put into the material crushing tank through the material feeding port, the plastic products are processed and sequentially processed through the material washing tank and the material melting tank, the same device is used in multiple processes, collection and transfer to the next process are not needed after each process is finished, and the working efficiency is obviously improved;

2. when the material crushing assembly, the material washing assembly, the water discharging assembly and the stirring assembly are used for processing plastic products, the driving motor is used as a driving source, and the space is saved while the energy is saved.

Drawings

FIG. 1 is a schematic structural diagram of a recycling and pelletizing apparatus for waste plastics according to this embodiment;

FIG. 2 is a schematic sectional view of a recycling and pelletizing apparatus for waste plastics according to this embodiment;

FIG. 3 is a schematic illustration of a spitwad assembly;

FIG. 4 is a schematic structural view of a cleaning assembly and a stirring assembly;

FIG. 5 is a schematic view of the ratchet assembly;

FIG. 6 is a schematic view of the construction of the drive shaft;

fig. 7 is a partially enlarged schematic view of a portion a of fig. 2.

Description of reference numerals:

1. crushing the material tank; 11. a feed inlet; 12. a through hole; 2. a washing tank; 21. a water inlet; 22. a water outlet; 23. a feed opening; 231. an electrically controlled valve; 232. a guide slope; 3. a melting tank; 31. a discharge port; 4. a drive assembly; 41. a drive motor; 42. a drive shaft; 421. mounting an embedding groove; 5. a scrap assembly; 51. installing a shaft; 52. a material crushing rod; 53. a blade; 6. cleaning the assembly; 61. a rotating shaft; 62. mounting a block; 63. a connecting rod; 7. a drainage assembly; 71. a baffle plate; 72. a filter plate; 73. a guide bar; 8. a ratchet assembly; 81. a ratchet wheel; 82. a pawl; 83. a telescopic rod; 84. a spring; 9. a stirring assembly; 91. a rotating rod; 92. a stirring rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

Referring to fig. 1 and fig. 2, the embodiment of the application discloses a waste plastic retrieves prilling granulator, including garrulous material jar 1, set up in garrulous material jar 1 below washing tank 2 and set up in the melt tank 3 of washing tank 2 below, garrulous material jar 1, washing tank 2 and melt tank 3 from top to bottom integrated into one piece set up and the central axis coincides mutually. Be provided with crushed aggregates subassembly 5 in the garrulous material jar 1, be provided with washing subassembly 6 and drainage subassembly 7 in the washing bucket 2, the plastic products that get into in the garrulous material jar 1 is cut up by crushed aggregates subassembly 5 and is formed the plastic chip, the plastic chip gets into and cleans under the effect of washing subassembly 6 in the washing bucket 2, after the cleanness is accomplished by the sewage discharge of drainage subassembly 7 in with washing bucket 2, and then the plastic chip of clean completion gets into melting tank 3 and melts, the plastics that melt into the thick form thing are through finalizing the design, form the recycled plastic particle after cooling and the cutting.

Referring to fig. 2 and 3, the crushing tank 1 is a cylindrical structure, the inside of the crushing tank is hollow, a feed inlet 11 is formed in the top end of the crushing tank 1, a hopper is fixedly arranged on the inner side wall of the feed inlet 11, and a plurality of through holes 12 are uniformly formed in the bottom plate of the crushing tank 1. The crushing assembly 5 comprises a mounting shaft 51, a crushing rod 52 and a blade 53 which are arranged in the center of the crushing tank 1; the mounting shaft 51 is a cylindrical structure with a hollow interior, and the mounting shaft 51 is rotatably arranged in the crushing tank 1; a plurality of groups of crushed aggregates rods 52 are arranged on the peripheral side of the mounting shaft 51 in a staggered manner, and the length direction of the crushed aggregates rods 52 is vertical to that of the mounting shaft 51; each of the scrap bars 52 is provided on its peripheral side with a plurality of blades 53, and the length direction of the blades 53 is the same as the length direction of the scrap bars 52.

The top of the crushing tank 1 is provided with a driving assembly 4 for driving the crushing assembly 5 to operate, and the driving assembly 4 comprises a driving motor 41 and a driving shaft 42 arranged on an output shaft of the driving motor 41. Driving motor 41 sets up on the lateral wall at crushed aggregates jar 1 top, and is located the central authorities of crushed aggregates jar 1, sets up the hole of stepping down that supplies driving motor 41's output shaft to penetrate on crushed aggregates jar 1's the top, and drive shaft 42 integrated into one piece installs on driving motor 41's output shaft, and the installation axle 51 cover is located on drive shaft 42, rotates under driving shaft 42's drive.

When carrying out the granulation to waste plastic, at first put into the hopper with the plastic products of retrieving, plastic products gets into in the garrulous material jar 1 by feed inlet 11, start driving motor 41, drive shaft 42 drives installation axle 51 and rotates, thereby install the epaxial garrulous material pole 52 of axle 51 and rotate, the garrulous material pole 52 of a plurality of crisscross settings rotates, the last blade 53 that sets up of garrulous material pole 52 cuts the plastic products in garrulous material jar 1, and then form the plastic fragments, the plastic fragments that the cutting was accomplished fall to the bottom in garrulous material jar 1 and get into in the material washing jar 2 through-hole 12.

Referring to fig. 2 and 4, the material washing tank 2 is also a cylindrical structure, and has a hollow interior, a water inlet 21 for clean water to enter is formed in the upper portion of the side wall of the material washing tank 2, and a water outlet 22 for discharging sewage after the plastic fragments are washed is formed in the lower portion of the side wall of the material washing tank 2. Cleaning assembly 6 is including setting up in pivot 61, installation piece 62 and the connecting rod 63 at wash tank 2 center, and pivot 61 rotates and sets up in wash tank 2, the upper end of pivot 61 and the bottom fixed connection of drive shaft 42, the lower extreme of pivot 61 and the bottom plate fixed connection of wash tank 2, and installation piece 62 is installed in pivot 61, and connecting rod 63 fixed mounting is on installation piece 62.

The bottom plate of washing material jar 2 rotates with the lateral wall of washing material jar 2 to be connected the setting, has seted up annular rotation groove on the lateral wall of washing material jar 2, and the bottom plate of washing material jar 2 rotates at the rotation inslot under the drive of pivot 61. The drainage assembly 7 comprises a filter plate 72 arranged on the inner side wall of the water outlet 22 and a baffle 71 fixedly connected to the connecting rod 63, the baffle 71 is of an arc-shaped structure attached to the inner side wall of the washing tank 2, and the baffle 71 abuts against the inner side wall of the washing tank 2 and is used for opening and closing the water outlet 22. Be provided with two-way screw on the periphery side of pivot 61, installation piece 62 threaded connection is in pivot 61, washs subassembly 6 and still includes the guide bar 73 that sets up in washing material jar 2, and guide bar 73 is electric telescopic handle, and electric telescopic handle's stiff end sets firmly in the bottom of garrulous material jar 1, electric telescopic handle's flexible end and the middle part fixed connection of connecting rod 63.

Clear water is put into the washing tank 2 through the water inlet 21, and the plastic chips after cutting enter the washing tank 2, and the rotating shaft 61 rotates under the driving of the driving shaft 42, and the rotating shaft 61 drives the bottom plate of the washing tank 2 to rotate, so that vortex-shaped water flow is formed in the washing tank 2, and the plastic chips are washed. Simultaneously connecting rod 63 stirs the plastics piece for the cleaning performance of plastics piece is better. When the volume of plastic fragments accounted for wash tank 2 volumetric more than two-thirds, garrulous material jar 1 stops to carry out the breakage to plastic products to guarantee wash tank 2 is to the cleaning performance of plastic fragments.

Referring to fig. 2, 5 and 6, a ratchet assembly 8 is also disposed within the crush can 1, the ratchet assembly 8 being disposed between the mounting shaft 51 and the drive shaft 42. The ratchet assembly 8 comprises a ratchet 81 arranged on the inner side wall of the mounting shaft 51, a mounting groove 421 is formed in the driving shaft 42, the ratchet assembly 8 further comprises a pawl 82 arranged in the mounting groove 421, an expansion link 83 and a spring 84, the pawl 82 is rotatably arranged in the mounting groove 421, the free end of the expansion link 83 is hinged to the middle of the pawl 82, the spring 84 is sleeved on an output shaft of the expansion link 83, the expansion link 83 is used for driving the pawl 82 to move towards the direction far away from the bottom of the mounting groove 421, and the spring 84 can play a role in resetting after the expansion link 83 is compressed.

The plastic fragments are cleaned by the material washing tank 2 while the material is crushed in the material crushing tank 1, at the moment, the output shaft of the driving motor 41 rotates in the forward direction, the telescopic rod 83 drives the pawl 82 to move in the direction far away from the bottom of the embedding groove 421, the pawl 82 is meshed with the ratchet of the ratchet 81, and therefore the mounting shaft 51 is driven by the driving shaft 42 to rotate. When the volume of the plastic fragments accounts for more than two thirds of the volume of the washing tank 2, the output shaft of the driving motor 41 reversely rotates, the pawl 82 is abutted to the inner side wall of the ratchet 81, the pawl 82 compresses the telescopic rod 83 to move towards the direction close to the bottom of the embedding groove 421 under the compression action of the inner side wall of the ratchet 81, then the pawl 82 retracts into the embedding groove 421, the driving shaft 42 has no acting force on the mounting shaft 51 at the moment, but still drives the rotating shaft 61 to rotate, so the crushed aggregate component 5 stops crushing the plastic products, and the drainage component 7 is started to drain water at the moment.

Drive shaft 42 drives pivot 61 antiport when driving motor 41 antiport, electric telescopic handle's output shaft upward movement leads connecting rod 63 this moment, install piece 62 along pivot 61 upward movement simultaneously, delivery port 22 is kept away from gradually to baffle 71 upward movement under the drive of connecting rod 63, thereby delivery port 22 is opened, the sewage that washs the plastic debris can be followed delivery port 22 and is discharged, sewage exhaust in-process filter 72 filters the plastic debris, the filtration pore diameter on the filter 72 is less than the diameter of through-hole 12, filter 72 can prevent that the plastic debris from discharging along with sewage. After the sewage is discharged, the bottom plate of the washing tank 2 still rotates under the action of the rotating shaft 61, and the plastic fragments can be dehydrated by the centrifugal force generated by the rotation of the bottom plate of the washing tank 2.

Referring to fig. 2, 4 and 7, a feed opening 23 is formed in the bottom plate of the washing tank 2, an electric control valve 231 is fixedly installed on the inner side wall of the feed opening 23, when it is detected that dehydration is completed, that is, no water flows out from the water outlet 22, the electric control valve 231 is controlled to be opened, and plastic fragments enter the melting tank 3 through the feed opening 23. Meanwhile, the inner side wall of the feed opening 23 is provided with the guide inclined surface 232, and the process that the plastic fragments enter the feed opening 23 can be smoother due to the arrangement of the guide inclined surface 232.

Melt jar 3 is the cylindric hollow tank body, is provided with heating element on the inside wall of melt jar 3, and the plastics piece after the washing completion melts under the heating action of melt jar 3, has seted up discharge gate 31 on the lateral wall of melt stove. A stirring assembly 9 is arranged in the melting pot 3, and the stirring assembly 9 comprises a rotating rod 91 rotatably arranged in the melting pot 3 and a stirring rod 92 arranged on the rotating rod 91. The top end of the rotating rod 91 is fixedly connected with the rotating shaft 61, the bottom end of the rotating rod 91 is rotatably arranged at the bottom of the melting tank 3, the stirring rod 92 is vertically arranged on the outer peripheral side of the rotating rod 91, and the stirring rods 92 are arranged on the rotating rod 91 in a plurality.

In the plastic fragment got into melt jar 3, melt under the heating of melt jar 3, bull stick 91 stirs the plastic fragment under the drive of pivot 61 simultaneously, makes the plastic fragment be heated evenly, and the thick form that forms after melting is more even, melts thick form after the completion and discharges and carry out subsequent processing step through discharge gate 31.

In the embodiment, the crushing assembly 5, the washing assembly, the water discharging assembly 7 and the stirring assembly 9 all use the driving motor 41 as a driving source when processing plastic products, so that the space is saved and the energy is saved. Plastic products process after throwing into the feed opening and link up in order to wash feed tank 2 and melt jar 3 and process after material jar 1, and same device is used to many processes, need not collect after every process is accomplished and transport to next process, and work efficiency is showing and is promoting.

The embodiment discloses a granulation method based on a waste plastic recovery device.

A granulation method based on a waste plastic recovery device comprises the following steps:

s1, putting the plastic products into a material crushing tank 1 from a feeding hole 11, and driving a material crushing assembly 5 to crush the plastic products into plastic fragments by a driving assembly 4;

s2, enabling plastic fragments to enter the washing tank 2 through the through hole 12, driving the bottom plate of the washing tank 2 to rotate through the driving assembly 4, enabling water flow in the washing tank 2 to form a vortex to clean the plastic fragments, and discharging waste water through the drainage assembly 7 after cleaning is finished;

s3, the cleaned plastic fragments enter the melting tank 3 through the feed opening 23, the plastic fragments are melted under the heating of the melting tank 3, and the melted thick substances are discharged from the discharge opening;

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a waste plastic retrieves prilling granulator which characterized in that: the device comprises a material crushing tank (1), a material washing tank (2) arranged below the material crushing tank (1) and a material melting tank (3) arranged below the material washing tank (2), wherein the material crushing tank (1), the material washing tank (2) and the material melting tank (3) are integrally formed and the central axes of the material crushing tank, the material washing tank and the material melting tank coincide;

the plastic product crushing device is characterized in that a feeding hole (11) is formed in the crushing tank (1), a crushing assembly (5) used for crushing plastic products is arranged in the crushing tank (1), a driving assembly (4) used for driving the crushing assembly (5) to operate is arranged at the top of the crushing tank (1), and a plurality of through holes (12) used for plastic fragments to fall are formed in the bottom of the crushing tank (1);

the washing tank (2) is provided with a water inlet (21) and a water outlet (22), a washing assembly (6) and a water discharging assembly (7) are arranged in the washing tank (2), the driving assembly (4) is further used for driving the washing assembly (6) to wash plastic fragments falling from the material crushing tank (1), the water discharging assembly (7) is used for discharging waste water after washing is completed, the bottom of the washing tank (2) is provided with a discharging port (23), and an electric control valve (231) is arranged on the inner side wall of the discharging port (23);

the cleaned plastic fragments enter the melting material tank (3) through the feed opening (23), and a discharge opening (31) is formed in the melting material tank (3).

2. The recycling and granulating device of waste plastics as claimed in claim 1, characterized in that: the crushing assembly (5) comprises an installation shaft (51) vertically arranged in the crushing tank (1), a crushing rod (52) arranged on the installation shaft (51) and blades (53) arranged on the crushing rod (52); the driving assembly (4) comprises a driving motor (41) and a driving shaft (42) fixedly connected to an output shaft of the driving motor (41), and the driving shaft (42) is sleeved with the mounting shaft (51).

3. The recycling and granulating device for waste plastics as claimed in claim 2, characterized in that: the plurality of the material crushing rods (52) are arranged on the mounting shaft (51) in a staggered mode, and the plurality of the blades (53) are arranged on the peripheral side of each material crushing rod (52).

4. The recycling and granulating device for waste plastics as claimed in claim 2, characterized in that: wash subassembly (6) including pivot (61), set up in installation piece (62) in pivot (61) and set up in connecting rod (63) on installation piece (62), the bottom plate of washing material jar (2) with the lateral wall of washing material jar (2) rotates to be connected, the bottom of pivot (61) with the bottom plate fixed connection of washing material jar (2), the top of pivot (61) with drive shaft (42) fixed connection.

5. The recycling and granulating device for waste plastics as claimed in claim 4, characterized in that: the drainage assembly (7) comprises a filter plate (72) arranged on the inner side wall of the water outlet (22) and a baffle plate (71) fixedly connected to the connecting rod (63), and the baffle plate (71) abuts against the inner side wall of the washing tank (2) and is used for opening and closing the water outlet (22); be provided with two-way screw on the periphery side of pivot (61), installation piece (62) threaded connection in pivot (61), be provided with guide bar (73) in wash tank (2), guide bar (73) are electric telescopic handle, electric telescopic handle's stiff end set firmly in the bottom of garrulous material jar (1), electric telescopic handle's flexible end with the middle part fixed connection of connecting rod (63).

6. The recycling and granulating device for waste plastics as claimed in claim 5, characterized in that: still be provided with ratchet assembly (8) in garrulous material jar (1), ratchet assembly (8) set up in installation axle (51) with between drive shaft (42), ratchet assembly (8) are used for control installation axle (51) is in stall when drive shaft (42) antiport.

7. The recycling and granulating device for waste plastics as claimed in claim 6, characterized in that: ratchet subassembly (8) including set up in ratchet (81) on installation axle (51) inside wall, loading caulking groove (421) have been seted up on drive shaft (42), ratchet subassembly (8) still including set up in pawl (82), telescopic link (83) and spring (84) in loading caulking groove (421), pawl (82) rotate set up in loading caulking groove (421), the telescopic shaft of telescopic link (83) with the middle part of pawl (82) is articulated, spring (84) cover is located on the output shaft of telescopic link (83), telescopic link (83) are used for ordering about pawl (82) are to keeping away from the direction motion of loading caulking groove (421) bottom.

8. The recycling and granulating device of waste plastics as claimed in claim 4, characterized in that: still include stirring subassembly (9), stirring subassembly (9) including rotate set up in bull stick (91) in melt tank (3) with set up in puddler (92) on bull stick (91) week side, the top of bull stick (91) with pivot (61) fixed connection.

9. The recycling and granulating device for waste plastics as claimed in claim 1, characterized in that: and a guide inclined plane (232) is arranged on the inner side wall of the feed opening (23).

10. A granulation method based on a waste plastic recycling device, which applies the waste plastic recycling granulation device as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:

s1, feeding plastic products into the crushing tank (1) from the feeding hole (11), wherein the driving assembly (4) drives the crushing assembly (5) to crush the plastic products into plastic fragments;

s2, enabling plastic fragments to enter the washing tank (2) through the through hole (12), driving the bottom plate of the washing tank (2) to rotate by the driving assembly (4), enabling water flow in the washing tank (2) to form a vortex so as to clean the plastic fragments, and discharging waste water by using the drainage assembly (7) after cleaning is finished;

s3, the cleaned plastic fragments enter the melting tank (3) through a feed opening (23), the plastic fragments are melted under the heating of the melting tank (3), and the melted thick substances are discharged from a discharge opening;