CN212826301U - Plastic recycling and granulating production line - Google Patents

Abstract

The utility model discloses a plastic recovery and granulation production line, which comprises a crushing device, a melting device arranged beside the crushing device, a wire drawing device and a cutting and granulation device; the crushing device comprises an auger conveyor, a feeding mechanism arranged at one end of the auger conveyor, a warm air drying mechanism and a plastic crushing mechanism arranged at the other end of the auger conveyor; the melting device comprises a barrel body, a negative pressure air exhaust mechanism connected with the upper part of the barrel body and a stirring mechanism arranged in the barrel body; the wire drawing device comprises a rack, and an extruder, a water cooling mechanism and a tractor which are sequentially arranged on the rack; the cutting and granulating device comprises a box body, a wiredrawing strip conveying mechanism, a wiredrawing strip cutting mechanism and a purging and air-extracting mechanism, wherein the wiredrawing strip conveying mechanism, the wiredrawing strip cutting mechanism and the purging and air-extracting mechanism are arranged in the box body. The utility model discloses cutting is efficient, at the in-process of cutting the wire drawing strip, blows and the air exhaust pipeline combined action forms the direction air current of whereabouts through the pipeline of blowing for the wire drawing strip cuts off the back blanking very convenient rapidly.

Description

Plastic recycling and granulating production line

Technical Field

The utility model relates to a plastics recycling processing field, concretely relates to plastics recycling granulation production line.

Background

At present, most of various articles made of plastics in daily life are reproducible products, waste plastics need to be crushed when being recycled, but the plastic formed by general molding is not easy to feed, the elastic feeding of the plastic is easy to pop up, and meanwhile, plastic particles crushed by a traditional crusher are generally uneven. The waste plastic particles are recycled and melted to be made into things needed by people, but the reproduction melting technology is not perfect, and as part of plastic particles are not melted better, the appearance of the product is influenced when a new product is put into the product, and the quality of the product is also seriously influenced. And a relatively large amount of water is consumed in the process of reproducing the drawing cooling.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a plastics recycling granulation production line to above-mentioned defect exactly.

The utility model comprises a crushing device, a melting device, a wire drawing device and a cutting and granulating device which are arranged beside the crushing device;

the crushing device comprises an auger conveyor, a feeding mechanism arranged at one end of the auger conveyor, a warm air drying mechanism and a plastic crushing mechanism arranged at the other end of the auger conveyor; the feeding mechanism is arranged at the upper part of one end of the auger conveyor and comprises an upper expansion part, a middle cylindrical part and a lower contraction part which are of cylindrical structures and are integrally formed, the upper expansion part is of a cylindrical structure with the diameter gradually increasing from top to bottom, the lower contraction part is of a cylindrical structure with the diameter gradually decreasing from top to bottom, and the lower contraction part is communicated with the auger conveyor; the warm air drying mechanism comprises a warm air blower and a warm air inlet pipe which are arranged on one side of the auger conveyor, one end of the warm air inlet pipe is connected with the warm air blower, and the other end of the warm air inlet pipe is communicated with the lower part of the middle cylindrical part; the plastic crushing mechanism comprises a cuboid shell communicated with the discharge end of the auger conveyor, and a first cutting roller and a second cutting roller which are arranged in the shell, wherein the first cutting roller is arranged at the upper part of the shell and positioned behind the discharge end of the auger conveyor, a first sieve plate is obliquely arranged in the shell and positioned below the first cutting roller, a second cutting roller is arranged below the first sieve plate, a second sieve plate is horizontally arranged below the second cutting roller, and a crushed material outlet is arranged below the second sieve plate;

the melting device comprises a barrel body, a negative pressure air exhaust mechanism connected with the upper part of the barrel body and a stirring mechanism arranged in the barrel body; the plastic preheating mechanism comprises a circular fixed block arranged on the inner wall of the barrel body and a group of inclined electric heating plates oppositely arranged in the inner ring of the fixed block, a gap for plastic to fall down is formed between the group of inclined electric heating plates, and an air suction opening is formed in the inner wall of the barrel body and positioned below the circular fixed block; the negative pressure air exhaust mechanism comprises an air extractor and a first air exhaust pipeline which are arranged on one side of the barrel body, one end of the first air exhaust pipeline is connected with the air extractor, the other end of the first air exhaust pipeline is connected with the air exhaust opening, and a filter screen is arranged at the air exhaust opening; the stirring mechanism comprises a stirring motor arranged at the bottom of the barrel body, a stirring shaft driven by the stirring motor to rotate and extend into the barrel body, and a plurality of groups of stirring blades arranged on the stirring shaft; a plurality of electric heating rods are vertically arranged upwards at the bottom of the barrel body, are arranged around a central shaft of the barrel body and are positioned in a gap between the stirring mechanism and the inner wall of the barrel body, and a slurry discharge port is also formed at the bottom of the barrel body;

the wire drawing device comprises a rack, and an extruder, a water cooling mechanism and a tractor which are sequentially arranged on the rack; a slurry feeding hole is formed in one end of the extruder, and the water cooling mechanism is arranged at the extrusion end of the extruder; the water cooling mechanism comprises a cooling water tank arranged on the upper layer of the rack, a filtering water tank, a standing water tank and a circulating water pump which are arranged on the lower layer of the rack, wherein a group of upper-row rotating rollers and a group of lower-row rotating rollers are arranged in the cooling water tank; the filter water tank is arranged on the lower layer rack below, a drain pipe is arranged at the bottom of the cooling water tank, a water outlet of the drain pipe is positioned above the filter water tank, the standing water tank is arranged on one side of the filter water tank, a water filtering port is arranged at the bottom of the filter water tank and communicated with the standing water tank, a water return pipeline connected with the circulating water pump is arranged at the lower part of the standing water tank, and an outlet end of the water return pipeline is positioned above the cooling water tank;

the cutting and granulating device is arranged behind the tractor and comprises a box body, a wiredrawing strip conveying mechanism, a wiredrawing strip cutting mechanism and a purging and air-extracting mechanism, wherein the wiredrawing strip conveying mechanism, the wiredrawing strip cutting mechanism and the purging and air-extracting mechanism are arranged in the box body; one side of the lower part of the box body is obliquely arranged downwards, the other side of the lower part of the box body is provided with a vertically downward discharging part, and the side wall of the box body is provided with a rectangular feeding notch part for a drawing strip guided by a tractor to enter; the wire drawing strip conveying mechanism comprises two groups of driving rollers and driven rollers which are oppositely arranged, the surfaces of the driving rollers and the driven rollers are provided with groove parts which are matched with each other and used for accommodating wire drawing strips entering from the rectangular feeding gap parts, and the depth of each groove part is smaller than the radius of each wire drawing strip, so that the wire drawing strips are extruded by the driving rollers and the driven rollers and are conveyed backwards; the wire drawing strip cutting mechanism comprises a wire drawing strip supporting plate, an upper cutter and a lower cutter, wherein the wire drawing strip supporting plate is arranged in the box body and is positioned behind the driving roller and the driven roller, and the upper cutter and the lower cutter are arranged behind the wire drawing strip supporting plate; the blowing and air-extracting mechanism comprises an air blowing pipeline extending into the box body from the top of the box body, a second air extracting pipeline arranged at the discharging part and communicated with the inside of the box body, and an air extracting pump connected with the second air extracting pipeline, wherein an air blowing opening of the air blowing pipeline faces the tops of the wire drawing strip supporting plate and the lower cutter, and a filter screen part is arranged at the connection part of the second air extracting pipeline and the box body; the driving roller is driven to rotate by a driving motor arranged on the outer wall of the box body; the air inlet end of the air blowing pipeline is connected with an air outlet of an air blower arranged beside the box body; the top height of the lower cutter is slightly lower than the height of the wiredrawing strip supporting plate, so that the wiredrawing strips naturally fall onto the top cutting edge of the lower cutter in the forward conveying process; the cutting edges of the lower cutter and the upper cutter are staggered and do not contact with each other.

The lower part of the shell is provided with a plurality of supporting legs, and a material receiving box is arranged between the supporting legs below the crushed material outlet.

The first material cutting roller and the second material cutting roller are driven by a driving motor arranged outside the shell to rotate and cut materials.

And the mesh aperture of the first mesh plate is larger than that of the second mesh plate.

The quantity of multiunit stirring paddle is three groups, and three stirring paddle of group evenly set up along vertical direction on the (mixing) shaft.

And a guide roller is arranged on one side of the tractor close to the cooling water tank, the upper part of the guide roller is abutted against the drawn wire strip cooled by the cooling water tank, and the drawn wire strip is transmitted to the tractor through the guide roller.

A sand filtration layer is arranged in the filtration water tank, and a stainless steel filter screen is paved on the surface of the sand filtration layer.

The upper row of rotating rollers and the lower row of rotating rollers are arranged in a staggered manner.

The surfaces of the upper row of rotating rollers and the lower row of rotating rollers are wrapped with flexible rubber layers.

The utility model has the advantages that: because the elasticity feeding of plastics self pops out easily, through auger conveyor feeding, the condition that appears popping out when having stopped direct feeding to smash guarantees that the feeding is even, and the electric fan heater can be weathered the discarded plastics after washing, and it rusts to reduce moisture to lead to the fact to corrode to the machine is inside, and the homogeneity of plastics crushed aggregates granule size has been guaranteed to a plurality of blank rollers. Preheating mechanism and heating rod and rabbling mechanism's cooperation through plastics for retrieve melting that plastic granules can be better, the negative pressure mechanism of bleeding sets up the feeding of being convenient for in plastics preheating mechanism below simultaneously. Water resources used in the wire drawing strip cooling process are effectively saved through the arrangement of the water cooling mechanism, and waste is avoided. The cutting efficiency is high, and in the process of cutting the drawn wire strips, the falling guide airflow is formed through the combined action of air blowing of the air blowing pipeline and air exhaust of the air exhaust pipeline, so that the drawn wire strips are very convenient and rapid to blank after being cut off.

Drawings

Fig. 1 is a schematic view of the connection structure of the present invention.

Fig. 2 is a schematic structural view of the crushing apparatus.

Fig. 3 is a schematic structural view of the second perforated plate.

Fig. 4 is a schematic structural diagram of the thawing apparatus.

Fig. 5 is a schematic structural view of the annular fixing block.

Fig. 6 is a schematic structural view of a plastic preheating mechanism.

Fig. 7 is a schematic top view of the plastic preheating mechanism.

Fig. 8 is a schematic structural view of the drawing apparatus.

FIG. 9 is a schematic view of the structure of the upper row of rotating rollers.

Fig. 10 is a schematic top view of the cooling water tank.

Fig. 11 is a schematic structural view of a cutting and pelletizing apparatus.

Fig. 12 is a schematic view of the structure of the upper cutter and the lower cutter.

Fig. 13 is a schematic structural view of the drive roll.

Detailed Description

As shown in the attached drawings, the utility model comprises a crushing device 100, a melting device 101 arranged beside the crushing device 100, a wire drawing device 102 and a cutting and granulating device 103;

the smashing device 100 comprises an auger conveyor 1, a feeding mechanism arranged at one end of the auger conveyor 1, a warm air drying mechanism and a plastic smashing mechanism arranged at the other end of the auger conveyor 1; the feeding mechanism is arranged at the upper part of one end of the auger conveyor 1 and comprises an upper expansion part 2, a middle cylindrical part 3 and a lower contraction part 4 which are of cylindrical structures and are integrally formed, the upper expansion part 2 is of a cylindrical structure with the diameter gradually increasing from top to bottom, the lower contraction part 4 is of a cylindrical structure with the diameter gradually decreasing from top to bottom, and the lower contraction part 4 is communicated with the auger conveyor 1; the warm air drying mechanism comprises a warm air blower 5 and a warm air inlet pipe 6 which are arranged on one side of the auger conveyor 1, one end of the warm air inlet pipe 6 is connected with the warm air blower 5, and the other end of the warm air inlet pipe is communicated with the lower part of the middle cylindrical part 3; the plastic crushing mechanism comprises a cuboid shell 7 communicated with the discharge end of the auger conveyor 1, and a first cutting roller 8 and a second cutting roller 9 which are arranged in the shell 7, wherein the first cutting roller 8 is arranged at the upper part of the shell 7 and is positioned behind the discharge end of the auger conveyor 1, a first sieve plate 10 is obliquely arranged in the shell 7 and below the first cutting roller 8, a second cutting roller 9 is arranged below the first sieve plate 10, a second sieve plate 12 is horizontally arranged below the second cutting roller 9, and a crushed material outlet 13 is arranged below the second sieve plate 12;

the melting device 101 comprises a barrel body 21, a negative pressure air exhaust mechanism connected with the upper part of the barrel body 21 and a stirring mechanism arranged in the barrel body 21; a plastic particle feeding hole 32 is formed in the top of the barrel body 21, a plastic preheating mechanism is arranged in the barrel body 21 below the plastic particle feeding hole 32, the plastic preheating mechanism comprises a circular fixing block 22 arranged on the inner wall of the barrel body 21 and a group of inclined electric heating plates 23 oppositely arranged in the inner ring of the fixing block 22, a gap for plastic to fall is formed between the group of inclined electric heating plates 23, and an air suction opening 25 is formed in the inner wall of the barrel body 21 and below the circular fixing block 22; the negative pressure air extraction mechanism comprises an air extractor 24 and a first air extraction pipeline 26 which are arranged on one side of the barrel body 21, one end of the first air extraction pipeline 26 is connected with the air extractor 24, the other end of the first air extraction pipeline is connected with the air extraction opening 25, and a filter screen is arranged at the air extraction opening 25; the stirring mechanism comprises a stirring motor 27 arranged at the bottom of the barrel body 21, a stirring shaft 28 driven by the stirring motor 27 to rotate and extending into the barrel body 21, and a plurality of groups of stirring blades 29 arranged on the stirring shaft 28; a plurality of electric heating rods 30 are vertically arranged upwards at the bottom of the barrel body 21, the electric heating rods 30 are arranged around the central shaft of the barrel body 21 and are positioned in a gap between the stirring mechanism and the inner wall of the barrel body 21, and a slurry discharge port 31 is also arranged at the bottom of the barrel body 21;

the wire drawing device 102 comprises a frame 40, and an extruder 41, a water cooling mechanism and a tractor 42 which are sequentially arranged on the frame 40; a slurry feeding hole is formed in one end of the extruder 41, and the water cooling mechanism is arranged at the extrusion end of the extruder 41; the water cooling mechanism comprises a cooling water tank 43 arranged on the upper layer of the rack 40, a filtering water tank 44 arranged on the lower layer of the rack 40, a standing water tank 45 and a circulating water pump 46, wherein a group of upper row rotating rollers 47 and a group of lower row rotating rollers 48 are arranged in the cooling water tank 43, the traction machine 42 is positioned at the rear part of the cooling water tank 43, and a wire drawing strip 49 extruded in the extrusion machine 41 is in contact with the lower parts of the upper row rotating rollers 47 and the upper parts of the lower row rotating rollers 48 under the traction of the traction machine 42; the filtering water tank 44 is arranged on the lower-layer rack 40 below, the bottom of the cooling water tank 43 is provided with a water drainage pipe 50, the water outlet of the water drainage pipe 50 is positioned above the filtering water tank 44, the standing water tank 45 is arranged on one side of the filtering water tank 44, the bottom of the filtering water tank 44 is provided with a water filtration port communicated with the standing water tank 45, the lower part of the standing water tank 45 is provided with a water return pipe 51 connected with the circulating water pump 46, and the outlet end of the water return pipe 51 is positioned above the cooling water tank 43;

the cutting and granulating device 103 is arranged behind the tractor 42 and comprises a box body 60, a wiredrawing strip conveying mechanism, a wiredrawing strip cutting mechanism and a purging and air-extracting mechanism, wherein the wiredrawing strip conveying mechanism, the wiredrawing strip cutting mechanism and the purging and air-extracting mechanism are arranged in the box body 60; one side of the lower part of the box body 60 is obliquely arranged downwards, the other side of the lower part of the box body 60 is provided with a vertically downward discharging part 61, and the side wall of the box body 60 is provided with a rectangular feeding notch part 62 for the drawn threads 49 guided by the tractor 42 to enter; the drawstring conveying mechanism comprises two groups of driving rollers 63 and driven rollers 64 which are oppositely arranged, the surfaces of the driving rollers 63 and the driven rollers 64 are provided with groove parts 65 which are matched with each other and used for accommodating drawstrings 49 entering from the rectangular feeding notch part 62, and the depth of each groove part 65 is smaller than the radius of each drawstring, so that each drawstring is extruded by the driving rollers 63 and the driven rollers 64 and is conveyed backwards; the wire-drawing strip cutting mechanism comprises a wire-drawing strip supporting plate 70 arranged in the box body 60 and positioned behind the driving roller 63 and the driven roller 64, an upper cutter 71 and a lower cutter 72 arranged behind the wire-drawing strip supporting plate 70, wherein the top of the box body 60 is provided with an air cylinder 73, the upper cutter 71 is fixedly arranged at the end part of a telescopic rod extending into the box body 60 by the air cylinder 73 through an upper cutter mounting seat 74, so that the upper cutter 71 moves up and down under the driving of the air cylinder 73, the lower cutter 72 is fixedly arranged in the box body 60 below the upper cutter 71 through a lower cutter mounting seat 75, and the lower cutter 72 and the upper cutter 71 are arranged in a relative staggered manner; the blowing and air-extracting mechanism comprises an air blowing pipeline 67 extending into the box body 60 from the top of the box body 60, a second air extracting pipeline 68 arranged at the discharging part 61 and communicated with the inside of the box body 60, and an air extracting pump 69 connected with the second air extracting pipeline 68, wherein an air blowing opening of the air blowing pipeline 67 faces the tops of the strand pulling supporting plate 70 and the lower cutting knife 72, and a filter screen part is arranged at the connection part of the second air extracting pipeline 68 and the box body 60; the driving roller 63 is driven to rotate by a driving motor arranged on the outer wall of the box body 60; the air inlet end of the air blowing pipeline 67 is connected with an air outlet of an air blower arranged beside the box body 60; the top height of the lower cutter 72 is slightly lower than that of the drawstring supporting plate 70, so that the drawstring naturally falls onto the top cutting edge of the lower cutter 72 in the forward conveying process; the cutting edges of the lower cutter 72 and the upper cutter 71 are staggered and do not contact with each other.

A plurality of supporting legs 14 are arranged at the lower part of the shell 7, and a material receiving box 15 is arranged between the supporting legs 14 below the crushed material outlet 13.

The first material cutting roller 8 and the second material cutting roller 9 are driven by a driving motor arranged outside the shell 7 to rotate and cut materials.

The mesh aperture of the first mesh plate 10 is larger than that of the second mesh plate 12.

The number of the stirring blades 29 is three, and the stirring blades 29 are uniformly arranged on the stirring shaft 28 along the vertical direction.

A guide roller 52 is arranged on one side of the tractor 42 close to the cooling water tank 43, the upper part of the guide roller 52 is in contact with the drawn wire 49 cooled by the cooling water tank 43, and the drawn wire 49 is transmitted to the tractor 42 through the guide roller 52.

A sand filtering layer 53 is arranged in the filtering water tank 44, and a stainless steel filtering net is laid on the surface of the sand filtering layer 53.

A group of upper row rotating rollers 47 and a group of lower row rotating rollers 48 are provided alternately with each other.

The surfaces of the upper and lower rotating rollers 47 and 48 are covered with a flexible rubber layer 54.

The working principle is as follows: the operating personnel at first washes the discarded plastics of retrieving and dries, then with plastics from auger conveyor 1 upper portion feed mechanism drops into the feeding, opens electric fan heater 5 simultaneously and further weathers plastics, guarantees the drying of feeding, reduces the corruption to equipment, and the plastics of retrieving enter into in casing 7 under the transport of reaming conveyer 1, then in proper order through the crushing cutting of first cutting roller 8 and second cutting roller 9, falls down in proper order from the sieve mesh of first sieve mesh board 10 and second sieve mesh board 12 after the crushed aggregates granule reaches the requirement, falls into in crushed aggregates export 13 connects magazine 15 at last. Through auger conveyor feeding, the condition that plastics popped out appears when having stopped direct feeding to smash guarantees that the feeding is even, and the electric fan heater can be weathered the discarded plastics after the washing, reduces moisture and causes to corrode to rust to the machine is inside, and the homogeneity of plastics crushed aggregates granule size has been guaranteed to a plurality of blank rollers.

An operator crushes recycled waste plastics into granules and then feeds the granules from a plastic granule feeding port 32 at the top of the barrel body 21, then the inclined electric heating plates 23 and the electric heating rods 30 are electrified to heat, meanwhile, the air extractor 24 is started to extract air under negative pressure, the stirring motor 27 at the bottom of the barrel body 21 is started to slowly stir, and after the plastic granules are completely melted, the liquid discharging valve of the slurry discharging port 31 is opened to discharge the materials. Preheating mechanism and heating rod and rabbling mechanism's cooperation through plastics for retrieve melting that plastic granules can be better, negative pressure air exhaust mechanism sets up the feeding of being convenient for below preheating mechanism at plastics simultaneously, plays the effect of pull raw materials granule.

Then, an operator pours the melted plastic slurry into the extruder 41 through the slurry feed port, the extruder 41 extrudes a strand strip 49 and then is driven by the tractor 42 to carry out rapid cooling in the cooling water tank 43, a valve of a drain pipe 50 at the bottom of the cooling water tank 43 is opened to drain water at intervals during cooling, meanwhile, a circulating water pump 46 is started to pump cold water in the standing water tank 45 into the cooling water tank 43, and after the temperature of the water in the cooling water tank 43 is lowered, the valve of the drain pipe 50 and the circulating water pump 46 are closed, so that the plastic slurry is recycled. Water resources used in the wire drawing strip cooling process are effectively saved through the arrangement of the water cooling mechanism, and waste of the water resources is avoided.

An operator introduces the drawbench 49 guided by the tractor into a drawbench conveying mechanism in the box body, the drawbench is pushed forwards to a drawbench supporting plate 70 through a driving roller 63 and a driven roller 64, then continuously moves forwards and falls on a cutting edge at the top of a lower cutter 72 behind the drawbench supporting plate 70, and then the upper cutter 71 reciprocates up and down under the action of an air cylinder 73 to cut the drawbench falling on the cutting edge at the top of the lower cutter 72. During cutting, air is continuously blown into the box body through the air blowing pipeline 67, the cut-off wiredrawing strip particles are blown away and fall down, and meanwhile, the air suction pump 69 is started to suck air in the discharging part 61 through the second air suction pipeline 68, so that the cutting particles are guided to fall fast. The device has high cutting efficiency, and in the process of cutting the drawn wire strips, the blowing pipeline blows air and the air exhaust pipeline exhausts air to jointly form falling guide airflow, so that the drawn wire strips are very convenient and rapid to blank after being cut off.

Claims (9)

1. A plastic recycling and granulating production line is characterized by comprising a crushing device (100), a melting device (101) arranged beside the crushing device (100), a wire drawing device (102) and a cutting and granulating device (103);

the smashing device (100) comprises an auger conveyor (1), a feeding mechanism arranged at one end of the auger conveyor (1), a warm air drying mechanism and a plastic smashing mechanism arranged at the other end of the auger conveyor (1); the feeding mechanism is arranged at the upper part of one end of the auger conveyor (1), the feeding mechanism comprises an upper expansion part (2), a middle cylindrical part (3) and a lower contraction part (4) which are of cylindrical structures and are integrally formed, the upper expansion part (2) is of a cylindrical structure with the diameter gradually increasing from top to bottom, the lower contraction part (4) is of a cylindrical structure with the diameter gradually decreasing from top to bottom, and the lower contraction part (4) is communicated with the auger conveyor (1); the warm air drying mechanism comprises a warm air blower (5) and a warm air inlet pipe (6) which are arranged on one side of the auger conveyor (1), one end of the warm air inlet pipe (6) is connected with the warm air blower (5), and the other end of the warm air inlet pipe is communicated with the lower part of the middle cylindrical part (3); the plastic crushing mechanism comprises a cuboid shell (7) communicated with the discharge end of the auger conveyor (1), a first cutting roller (8) and a second cutting roller (9) which are arranged in the shell (7), wherein the first cutting roller (8) is arranged at the upper part of the shell (7) and is positioned behind the discharge end of the auger conveyor (1), a first sieve plate (10) is obliquely arranged in the shell (7) and below the first cutting roller (8), the second cutting roller (9) is arranged below the first sieve plate (10), a second sieve plate (12) is horizontally arranged below the second cutting roller (9), and a crushed material outlet (13) is arranged below the second sieve plate (12);

the melting device (101) comprises a barrel body (21), a negative pressure air exhaust mechanism connected with the upper part of the barrel body (21) and a stirring mechanism arranged in the barrel body (21); a plastic particle feeding hole (32) is formed in the top of the barrel body (21), a plastic preheating mechanism is arranged in the barrel body (21) below the plastic particle feeding hole (32), the plastic preheating mechanism comprises a circular fixing block (22) arranged on the inner wall of the barrel body (21) and a group of inclined electric heating plates (23) oppositely arranged in the inner ring of the fixing block (22), a gap for plastic to fall is formed between the group of inclined electric heating plates (23), and an air suction hole (25) is formed in the inner wall of the barrel body (21) and located below the circular fixing block (22); the negative pressure air extraction mechanism comprises an air extractor (24) and a first air extraction pipeline (26), the air extractor (24) is arranged on one side of the barrel body (21), one end of the first air extraction pipeline (26) is connected with the air extractor (24), the other end of the first air extraction pipeline is connected with the air extraction opening (25), and a filter screen is arranged at the air extraction opening (25); the stirring mechanism comprises a stirring motor (27) arranged at the bottom of the barrel body (21), a stirring shaft (28) driven by the stirring motor (27) to rotate and extend into the barrel body (21), and a plurality of groups of stirring blades (29) arranged on the stirring shaft (28); a plurality of electric heating rods (30) are vertically arranged upwards at the bottom of the barrel body (21), the electric heating rods (30) are arranged around the central shaft of the barrel body (21) and are positioned at a gap between the stirring mechanism and the inner wall of the barrel body (21), and a slurry discharge port (31) is also arranged at the bottom of the barrel body (21);

the wire drawing device (102) comprises a rack (40), and an extruder (41), a water cooling mechanism and a tractor (42) which are sequentially arranged on the rack (40); a slurry feeding hole is formed in one end of the extruder (41), and the water cooling mechanism is arranged at the extrusion end of the extruder (41); the water cooling mechanism comprises a cooling water tank (43) arranged on the upper layer of the rack (40), a filtering water tank (44) arranged on the lower layer of the rack (40), a standing water tank (45) and a circulating water pump (46), a group of upper row rotating rollers (47) and a group of lower row rotating rollers (48) are arranged in the cooling water tank (43), the tractor (42) is positioned at the rear part of the cooling water tank (43), and drawn threads (49) extruded in the extruder (41) are abutted to the lower parts of the upper row rotating rollers (47) and the upper parts of the lower row rotating rollers (48) under the traction of the tractor (42); the water filtering tank (44) is arranged on the lower-layer rack (40) below, a water discharging pipe (50) is arranged at the bottom of the cooling water tank (43), a water outlet of the water discharging pipe (50) is positioned above the water filtering tank (44), the standing water tank (45) is arranged on one side of the water filtering tank (44), a water filtering port is arranged at the bottom of the water filtering tank (44) and communicated with the standing water tank (45), a water returning pipeline (51) connected with the circulating water pump (46) is arranged at the lower part of the standing water tank (45), and the outlet end of the water returning pipeline (51) is positioned above the cooling water tank (43);

the cutting and granulating device (103) is arranged behind the tractor (42) and comprises a box body (60), a wire drawing strip conveying mechanism, a wire drawing strip cutting mechanism and a purging and air extracting mechanism, wherein the wire drawing strip conveying mechanism, the wire drawing strip cutting mechanism and the purging and air extracting mechanism are arranged in the box body (60); one side of the lower part of the box body (60) is obliquely arranged downwards, the other side of the lower part of the box body (60) is provided with a vertically downward discharging part (61), and the side wall of the box body (60) is provided with a rectangular feeding notch part (62) for a drawn thread strip (49) guided by the tractor (42) to enter; the wire drawing strip conveying mechanism comprises two groups of driving rollers (63) and driven rollers (64) which are oppositely arranged, groove portions (65) which are matched with each other and used for containing wire drawing strips (49) entering from the rectangular feeding notch portions (62) are arranged on the surfaces of the driving rollers (63) and the driven rollers (64), and the depth of each groove portion (65) is smaller than the radius of each wire drawing strip, so that each wire drawing strip is extruded by the driving rollers (63) and the driven rollers (64) and is conveyed backwards; the wire-drawing strip cutting mechanism comprises a wire-drawing strip supporting plate (70) arranged in a box body (60) and positioned behind a driving roller (63) and a driven roller (64), and an upper cutter (71) and a lower cutter (72) arranged behind the wire-drawing strip supporting plate (70), wherein the top of the box body (60) is provided with a cylinder (73), the upper cutter (71) is fixedly arranged at the end part of a telescopic rod, extending into the box body (60), of the cylinder (73) through an upper cutter mounting seat (74), so that the upper cutter (71) moves up and down under the driving of the cylinder (73), the lower cutter (72) is fixedly arranged in the box body (60) below the upper cutter (71) through a lower cutter mounting seat (75), and the lower cutter (72) and the upper cutter (71) are arranged in a relative staggered manner; the blowing and air-extracting mechanism comprises an air blowing pipeline (67) extending into the box body (60) from the top of the box body (60), a second air extracting pipeline (68) arranged at the discharging part (61) and communicated with the inside of the box body (60), and an air extracting pump (69) connected with the second air extracting pipeline (68), wherein an air blowing opening of the air blowing pipeline (67) faces the tops of the strand pulling strip supporting plate (70) and the lower cutter (72), and a filter screen part is arranged at the connection part of the second air extracting pipeline (68) and the box body (60); the driving roller (63) is driven to rotate by a driving motor arranged on the outer wall of the box body (60); the air inlet end of the air blowing pipeline (67) is connected with an air outlet of an air blower arranged beside the box body (60); the top height of the lower cutter (72) is slightly lower than that of the drawstring supporting plate (70), so that the drawstring naturally falls onto the top cutting edge of the lower cutter (72) in the forward conveying process; the cutting edges of the lower cutter (72) and the upper cutter (71) are staggered and do not contact with each other.

2. A plastics recycling and pelletizing line as claimed in claim 1, characterized in that the lower part of the casing (7) is provided with a plurality of support legs (14), and between the support legs (14) below the scrap outlet (13) is provided with a material receiving box (15).

3. A plastic recycling granulation line as claimed in claim 1, characterized in that said first cutting roller (8) and said second cutting roller (9) are driven in rotation by a driving motor arranged outside said casing (7).

4. A plastics recycling granulation line according to claim 1, characterized in that said first perforated plate (10) has a mesh size greater than that of said second perforated plate (12).

5. A plastics recycling granulation line according to claim 1, characterized in that the number of the plurality of groups of stirring blades (29) is three, and the three groups of stirring blades (29) are uniformly arranged on said stirring shaft (28) along the vertical direction.

6. The plastic recycling and pelletizing line according to claim 1, characterized in that a guide roller (52) is disposed on one side of the tractor (42) close to the cooling water tank (43), the upper part of the guide roller (52) is in contact with the strand wires (49) cooled by the cooling water tank (43), and the strand wires (49) are transmitted to the tractor (42) through the guide roller (52).

7. The plastic recycling granulation production line as claimed in claim 1, wherein a sand filtration layer (53) is provided in the filtration water tank (44), and a stainless steel filter screen is laid on the surface of the sand filtration layer (53).

8. A plastic recycling granulation line as claimed in claim 1, characterized in that a set of upper rows of rotating rollers (47) and a set of lower rows of rotating rollers (48) are reciprocally staggered.

9. A plastic recycling granulation line as claimed in claim 1, characterized in that the surfaces of said upper and lower rows of rotating rollers (47, 48) are covered with a layer of flexible rubber (54).

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