CN211389689U - Modified plastic particle cutting device - Google Patents

Abstract

The utility model discloses a modified plastic particle cutting device, which comprises a water cooling mechanism, a drying mechanism and a granulating mechanism which are connected in sequence, wherein a first feed inlet is arranged at one side of the water cooling mechanism, which is close to an extruder, a second feed inlet which is communicated with the water cooling mechanism and the drying mechanism is arranged between the water cooling mechanism and the drying mechanism, and a third feed inlet which is communicated with the drying mechanism and the granulating mechanism is arranged between the drying mechanism and the granulating mechanism; the water cooling mechanism consists of a first chamber, a water spraying pipe and a conveying belt; the first feed port is arranged on one side of the first chamber, which is close to the extruder, and the modified plastic strip extruded by the extruder enters the first chamber through the first feed port; the conveying belt is fixed in the first cavity through the conveying belt fixing seat, and the conveying direction of the conveying belt is consistent with the advancing direction of the modified plastic strip; the water spraying pipe is fixed in the first cavity in an S-shaped loop and is positioned above the conveyor belt; the spray pipe is uniformly provided with spray holes, and the aperture of the spray holes is gradually increased in the advancing direction of the modified plastic strip. The problem of current plastic granules pelleter grain cutting speed and production efficiency are low is solved.

Description

Modified plastic particle cutting device

Technical Field

The utility model belongs to modified plastics preparation field relates to a modified plastic granules cutting device.

Background

The modified plastic is a plastic product which is processed by filling, blending, reinforcing and other methods on the basis of general plastics and engineering plastics and improves the performances of flame retardance, strength, impact resistance, toughness and the like. The raw materials are melted and then are made into strip-shaped modified plastics through an extruder, and the strip-shaped modified plastics are cooled and dried and then enter a granulator for cutting and granulation to prepare modified plastic particles for subsequent processing and use.

At present adopt the water-cooling to cool off the plastic strip more to adopt the desiccator to carry out the drying, and the desiccator that uses passes through the cold wind more and dries, can't be with the material strip complete drying after the water-cooling, make the material strip surface have water stain, the plastic granules that causes the cutting to obtain have water stain and be unfavorable for the storage, cause the pelleter cutter to rust easily simultaneously. The utility model patent of grant publication number CN206066755U discloses a pelleter of preparation plastic granules, and it leads to the plastic strip that comes out from the extruder through a plurality of guide rolls, makes it carry out preliminary cooling through the fan earlier, then carries out the secondary cooling through water cooling plant, and the air outlet through the fan at last utilizes except that this cooling back gained is hot-blast to carry out the drying to it, has improved the cooling effect, does not need additionally to use drying device simultaneously, resources are saved. However, the plastic strips discharged from the extruder are high in temperature and are not cooled for forming, the plastic strips are exposed in the air and easily absorb impurities such as dust in the air, the quality and the performance of the plastic are affected, the plastic strips are not cooled for forming completely before water cooling, the plastic strips are easy to break under the action of the guide roller and are difficult to reach a water cooling device for cooling and forming, the grain cutting speed and the production efficiency are low, and the plastic grain cutting machine only dries one side of the plastic strips at the air outlet, and the drying is not thorough.

Disclosure of Invention

An object of the embodiment of the utility model is to provide a modified plastic granules cutting device to solve current plastic granules pelleter and can't be with the plastic strip complete drying after the water-cooling and cause the plastic granules that the cutting obtained to have water stain and be unfavorable for the storage, cause the rusty problem of pelleter cutter easily, impurity in the air influences the problem of plastic quality and performance before the plastic strip cools off the shaping completely, and the problem that current plastic granules pelleter grain cutting speed and production efficiency hang down.

The embodiment of the utility model adopts the technical scheme that the modified plastic particle cutting device comprises a water cooling mechanism, a drying mechanism and a granulating mechanism which are sequentially connected, wherein the water cooling mechanism is provided with a first feed inlet at one side close to an extruder, a second feed inlet communicated with the water cooling mechanism and the drying mechanism is arranged between the water cooling mechanism and the drying mechanism, and a third feed inlet communicated with the drying mechanism and the granulating mechanism is arranged between the drying mechanism and the granulating mechanism;

the water cooling mechanism consists of a first chamber, a water spraying pipe and a conveying belt; the first feed port is arranged on one side of the first chamber close to the extruder, and the modified plastic strip extruded by the extruder enters the first chamber through the first feed port; the conveying belt is fixed in the first cavity through the conveying belt fixing seat, and the conveying direction of the conveying belt is consistent with the advancing direction of the modified plastic strips; the water spraying pipe is fixed in the first cavity in an S-shaped loop and is positioned above the conveyor belt; the spray pipe is uniformly provided with spray holes, and the aperture of the spray holes is gradually increased in the advancing direction of the modified plastic strip.

Furthermore, the drying mechanism is composed of a second chamber, and an upper air knife and a lower air knife which are fixed in the second chamber, the second feed port is arranged on one side of the second chamber close to the first chamber, the modified plastic strip reaches the second chamber from the first chamber through the second feed port, the upper air knife is arranged above the modified plastic strip through an air knife fixing mechanism corresponding to the upper air knife, the lower air knife is arranged below the modified plastic strip through an air knife fixing mechanism corresponding to the lower air knife, and the air cutting directions of the upper air knife and the lower air knife are opposite to the advancing direction of the modified plastic strip.

Furthermore, the upper air knife and the lower air knife respectively form an included angle of 32-40 degrees with the plane where the modified plastic strip is located, and the distance between the air knife edge and the modified plastic strip is 15-50 mm.

Furthermore, the air knife fixing mechanism consists of an air knife fixing seat, an air knife supporting seat and a fixing shaft, wherein the air knife fixing seat is provided with a mounting hole for mounting the fixing shaft, two ends of the fixing shaft are provided with threads, the two air knife fixing seats are oppositely arranged and fixed on the inner wall of the second cavity, the air knife supporting seat is fixed on the fixing shaft, and two ends of the fixing shaft respectively penetrate through the mounting hole of one air knife fixing seat and then are fixed through a nut in threaded connection with the fixing shaft; the upper air knife and the lower air knife are respectively fixed on the air knife supporting seats of the air knife fixing mechanisms corresponding to the upper air knife and the lower air knife.

Further, an air inlet is formed in the first cavity, an air drying box is arranged outside the first cavity, and the first cavity is communicated with the air inlet end of the air drying box through a first air pipe; the air outlet end of the air drying box is communicated with the upper air knife through a second air pipe to serve as an air source of the upper air knife, and the air outlet end of the air drying box is communicated with the lower air knife through a third air pipe to serve as an air source of the lower air knife.

Further, the granulating mechanism consists of a third chamber, a traction roller, a granulating auxiliary table and a cutter, and a third feeding port is arranged on one side of the third chamber close to the second chamber; in pulling the running roller, cutting grain auxiliary station and cutter all be fixed in the third cavity, pull the running roller and pull the running roller from main and constitute, locate main under pulling the running roller from pulling the running roller, the cutter is located main one side of pulling the running roller and keeping away from the third feed inlet, cuts grain auxiliary station and locates the cutter below.

Further, a motor is arranged outside the third chamber, and the motor is fixedly connected with the cutter through a speed reducer to drive the cutter to rotate and cut particles; the output shaft of the motor is fixedly sleeved with a first gear, the main shaft of the main traction roller is provided with a second gear, the main shaft of the auxiliary traction roller is provided with a third gear, an intermediate gear is arranged between the first gear and the second gear, the first gear is meshed with the second gear through the intermediate gear, and the second gear is meshed with the third gear.

Furthermore, the main traction roller and the auxiliary traction roller are wound and fixed with detachable roller water absorption layers.

Furthermore, an air outlet is formed in the bottom of one side, away from the second chamber, of the third chamber.

Furthermore, the first chamber, the second chamber and the third chamber are formed by sequentially arranging a first baffle and a second baffle in a cuboid shell, the first feed port is arranged on one side of the cuboid shell close to the extruder, the second feed port is arranged on the first baffle, and the third feed port is arranged on the second baffle;

the sizes and the positions of the first feed opening, the second feed opening and the third feed opening are consistent in height.

The embodiment of the utility model has the advantages that the modified plastic particle cutting device integrating cooling, drying and cutting is provided, the modified plastic strips extruded by the extruder enter the first cavity of the water cooling mechanism from the first feed inlet and are conveyed by the conveyor belt, the water spray pipes with gradually increased pore diameters spray the modified plastic strips in the conveying process of the conveyor belt, and the modified plastic strips which are not cooled and formed under the action of external force do not exist in the cooling process, so that the problem that the modified plastic strips are broken under the action of external force is avoided, the cooling effect is ensured, and the failure rate is reduced; meanwhile, the problem that impurities in the air affect the quality and the performance of the plastic is avoided, the appearance, the quality and the performance of the modified plastic strip are guaranteed, and the problem that the impurities in the air affect the quality and the performance of the plastic before the plastic strip is not completely cooled and molded is solved. The modified plastic strip is carried out hot-blast wind simultaneously and is cut the dewatering through adopting the hot-blast air knife and the lower air knife of following the interior outflow of first cavity and through dry to the modified plastic strip to twine fixed running roller layer that absorbs water on drawing the running roller and carry out secondary drying, drying effect is good, has solved current plastic granules pelleter and can't be with the plastic strip complete drying after the water-cooling and the plastic granules that cause the cutting to obtain have the water stain and be unfavorable for the storage, cause the rusty problem of pelleter cutter easily. After drying, under the traction effect of the traction roller, the modified plastic strip is dragged to the granulating auxiliary table for positioning, and the granulating auxiliary table is matched with the cutter for granulating, so that the granulating effect is effectively ensured. Modified plastic strip adopts the conveyer belt conveying before not shaping, adopts the traction roller wheel to pull after the shaping, compares in current plastic granulator, can reduce the emergence of trouble such as modified plastic strip fracture, off tracking by a wide margin to can effectively improve the translation rate of modified plastic strip, and then improve grain cutting speed and production efficiency by a wide margin, solved current plastic granules granulator grain cutting speed and the problem that production efficiency is low.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the internal structure of the modified plastic particle cutting device of the present invention.

Fig. 2 is a schematic view of the spray pipe and the arrangement of the spray holes thereof.

Fig. 3 is a schematic view of the air flow direction of the present invention.

In the figure, 1, a first chamber, 2, a water spray pipe, 3, spray holes, 4, a conveyor belt, 5, a modified plastic strip, 6, a second chamber, 7, an upper air knife, 8, a lower air knife, 9, an air knife fixing seat, 10, an air knife supporting seat, 11, a fixing shaft, 12, a third chamber, 13, a main traction roller, 14, a slave traction roller, 15, a roller water absorption layer, 16, a grain cutting auxiliary table, 17, a cutter, 18, an air drying box, 19, an air inlet, 20, a first air pipe, 21, a second air pipe, 22, a third air pipe, 23, an air outlet and 24, the conveyor belt fixing seat are arranged.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a modified plastic granules cutting device, as shown in figure 1, include the water cooling mechanism who meets the setting in proper order on 5 advancing direction of modified plastic strip, dry mechanism and eager grain mechanism, water cooling mechanism is close to extruder one side and is equipped with first feed inlet, is equipped with the second feed inlet of intercommunication the two between water cooling mechanism and the dry mechanism, is equipped with the third feed inlet of intercommunication the two between dry mechanism and the eager grain mechanism, and the modified plastic strip 5 that the extruder was extruded reachs eager grain mechanism behind water cooling mechanism and dry mechanism in proper order, forms modified plastic granules through eager grain mechanism cutting.

The water cooling mechanism comprises a first chamber 1, a water spraying pipe 2 and a conveyor belt 4, wherein a first feeding hole is formed in one side, close to the extruder, of the first chamber 1, and a modified plastic strip 5 extruded by the extruder enters the first chamber 1 through the first feeding hole. The water spray pipe 2 and the conveyor belt 4 are both arranged in the first cavity 1, the conveyor belt 4 is fixed in the first cavity 1 through the conveyor belt fixing seat 24, and the conveying direction of the conveyor belt is consistent with the advancing direction of the modified plastic strip 5. The conveyor belt 4 is used for conveying the modified plastic strips 5, and prevents the modified plastic strips 5 from being broken due to external tension before incomplete cooling so as to influence the granulating speed and efficiency. The water spray pipe 2 is fixed above the conveyor belt 4 in an S-shaped loop, and the water spray pipe 2 is preferably arranged in an S-shaped loop in a direction perpendicular to the modified plastic strip 5. As shown in fig. 1-2, the spray pipes 2 are uniformly distributed with spray holes 3, and the diameter of the spray holes 3 is gradually increased in the advancing direction of the modified plastic strip 5. The reason is that the modified plastic strip 5 just entering from the first feeding hole has high temperature, and is easy to deform and break under the action of external force, if the spray hole is too large, the appearance of the modified plastic strip is damaged to influence the subsequent cutting process, and even the quality and the performance of the modified plastic strip are changed. In the embodiment, the aperture of the spray holes 3 is gradually increased in the advancing direction of the modified plastic strip 5 to gradually increase the water flow, and the gradually increased water flow is provided in the gradual cooling process of the modified plastic strip 5, so that the modified plastic strip 5 can be effectively cooled without changing the appearance, quality and performance of the modified plastic strip 5. And before the modified plastic strip is cooled and formed, the modified plastic strip is conveyed by the conveyor belt 4 and is cooled by spraying water through the spray pipe 3, so that the adsorption of impurities is avoided, the quality and the performance of the modified plastic are ensured, and the modified plastic strip 5 cannot be broken by the action of external force when the modified plastic strip is not completely cooled and formed.

The drying mechanism comprises a second cavity 6, and an upper air knife 7 and a lower air knife 8 which are fixed in the second cavity 6, wherein a second feeding hole is formed in one side, close to the first cavity 1, of the second cavity 6, the modified plastic strip 5 reaches the second cavity 6 from the first cavity 1 through the second feeding hole, the upper air knife 7 is arranged above the modified plastic strip 5 through an air knife fixing mechanism corresponding to the upper air knife 7, the lower air knife 8 is arranged below the modified plastic strip 5 through an air knife fixing mechanism corresponding to the lower air knife 8, the air cutting direction of the upper air knife 7 and the air cutting direction of the lower air knife 8 are opposite to the advancing direction of the modified plastic strip 5, the upper air knife 7 and the lower air knife 8 are adopted to carry out air cutting, water removing and drying on the upper surface and the lower surface of the modified plastic strip 5 after cooling forming, long-term adjustment tests show that the included angles of the upper air knife 7 and the lower air knife 8 and the plane of the modified plastic strip 5 are 32-40 degrees, and the air knife openings of the upper air knife 7 and the, the air-cut drying effect is optimal, the requirements on the air speed and the air pressure are low, and the modified plastic strip 5 is not affected.

Air knife fixed establishment by air knife fixing base 9, air knife supporting seat 10 and fixed axle 11 are constituteed, air knife fixing base 9 is fixed on the inner wall of second cavity 6, and be equipped with the mounting hole that is used for installing fixed axle 11 on the air knife fixing base 9, air knife fixing base 9 is equipped with two, air knife supporting seat 10 is fixed on the fixed axle 11 that the screw thread is established at both ends, fix on air knife fixing base 9 through a nut rather than threaded connection behind the mounting hole of an air knife fixing base 9 respectively fixed axle 11 both ends, go up air knife 7 and lower air knife 8 and fix respectively on air knife supporting seat 10 rather than the air knife fixed establishment's that corresponds. When the angle of the air knife needs to be adjusted, the nut for fixing the air knife can be loosened to adjust, the cost is low, and the operation is convenient and fast.

As shown in fig. 3, an air inlet 19 is arranged on the first chamber 1, an air drying box 18 is arranged outside the first chamber 1, and the first chamber 1 is communicated with an air inlet end of the air drying box 18 through a first air pipe 20; the air outlet end of the air drying box 18 is communicated with the upper air knife 7 through a second air pipe 21 and is used as an air source of the upper air knife 7; the air outlet end of the air drying box 18 is communicated with the lower air knife 8 through a third air pipe 22 and is used as an air source of the lower air knife 8. Air enters the first cavity 1 after passing through the air inlet 19, is heated in the process of cooling the modified plastic strip 5, then enters the air drying box 18 through the first air pipe 20, and reaches the upper air knife 7 and the lower air knife 8 through the second air pipe 21 and the third air pipe 22 after being dried by the air drying box 18, so that the upper air knife 7 and the lower air knife 8 adopt hot air to carry out air cutting, water drying and good drying effect on the modified plastic strip 5.

Cut grain mechanism by third chamber 12, pull the running roller, cut grain auxiliary station 16 and cutter 17 and constitute, pull the running roller, cut grain auxiliary station 16 and cutter 17 and all be fixed in third chamber 12. The third feed inlet is arranged on one side of the third chamber 12 close to the second chamber 6, the traction roller is composed of a main traction roller 13 and a secondary traction roller 14, the secondary traction roller 14 is arranged under the main traction roller 13, the cutter 17 is arranged on one side of the main traction roller 13 far away from the third feed inlet, the granulating auxiliary table 16 is arranged under the cutter 17 and on one side of the secondary traction roller 14 far away from the third feed inlet, the modified plastic strip 5 reaches the third chamber 12 from the second chamber 6 through the third feed inlet and passes through the main traction roller 13 and the secondary traction roller 14, the modified plastic strip reaches the granulating auxiliary table 16 through the main traction roller 13 and the secondary traction roller 14 in a matching way, finally, the modified plastic strip is formed by cutting through the cutter 17, and the air outlet 23 is arranged at the bottom of one side of the third chamber 12 far away from the second chamber 6. In order to prevent the drying mechanism from drying the plastic strips incompletely, the roller wheel 13 and the roller wheel 15 which is fixedly and detachably wound on the traction roller wheel 14 can be wound at the main traction roller wheel, so that the modified plastic strips 5 can be secondarily dried when being pulled by the traction roller wheel, the drying effect is further ensured, the roller wheel water absorption layer 15 is made of soft materials such as absorbent cotton, and the replacement time and frequency of the roller wheel water absorption layer 15 on the traction roller wheel are determined according to the drying effect. As shown in fig. 1, the first chamber 1, the second chamber 6, and the third chamber 12 may be formed by sequentially disposing a first baffle and a second baffle in a rectangular parallelepiped housing to ensure sealability. The first feed inlet is arranged on one side, close to the extruder, of the cuboid shell, the second feed inlet is arranged on the first baffle, and the third feed inlet is arranged on the second baffle. The sizes and the position heights of the first feeding port, the second feeding port and the third feeding port can be kept consistent, so that the conveying effect of the modified plastic strips 5 is guaranteed, the occurrence of faults is reduced, and the grain cutting efficiency is improved.

The motor is arranged outside the third chamber 12, the motor is fixedly connected with the cutter 17 through the speed reducer to drive the cutter 17 to rotate and cut particles, meanwhile, a first gear is fixedly sleeved on the motor output shaft, a second gear is arranged on the main shaft of the main traction roller 13, a third gear is arranged on the main shaft of the auxiliary traction roller 14, an intermediate gear is arranged between the first gear and the second gear, the first gear is meshed with the second gear through the intermediate gear, the second gear is meshed with the third gear, the motor is started, the motor output shaft drives the first gear and the cutter 17 to rotate in the same direction, the first gear drives the second gear to rotate in the same direction through the intermediate gear, the second gear drives the third gear to rotate in the opposite direction, and then the cutter 17 and the traction roller are driven to work.

The utility model provides a cooling, it is dry, integrative modified plastic granules cutting device cuts, in operation, modified plastic strip 5 that the extruder was extruded is through the conveying of conveying belt 4 behind first feed inlet entering water-cooling mechanism's first cavity 1, the spray pipe 3 that increases gradually through the orifice aperture in the 4 data send processes of conveying belt is to its water spray cooling, there is not fashioned modified plastic strip 5 of exogenic action in the cooling process, the problem of impurity influence plastics quality and performance in the air before having avoided the plastic strip to cool off the shaping completely, and lead to the fact the cracked problem of modified plastic strip 5 because of exogenic action, the cooling effect has been guaranteed, the appearance of production efficiency and modified plastic strip 5, quality and performance. The cooled modified plastic strip 5 enters the drying mechanism through the second feeding hole, the upper air knife 7 and the lower air knife 8 simultaneously adopt hot air flowing out of the first cavity 1 and dried to carry out hot air cutting and water removal on the modified plastic strip 5, and the drying effect is good. And the dried modified plastic strip 5 enters the granulating mechanism through a third feeding port, is pulled by a traction roller to reach a granulating auxiliary table 16 for positioning, and then is cut by rotating a cutter 17 to form modified plastic particles.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A modified plastic particle cutting device is characterized by comprising a water cooling mechanism, a drying mechanism and a granulating mechanism which are sequentially connected, wherein a first feed inlet is formed in one side, close to an extruder, of the water cooling mechanism, a second feed inlet communicated with the water cooling mechanism and the drying mechanism is formed between the water cooling mechanism and the drying mechanism, and a third feed inlet communicated with the drying mechanism and the granulating mechanism is formed between the drying mechanism and the granulating mechanism;

the water cooling mechanism consists of a first chamber (1), a water spraying pipe (2) and a conveying belt (4); the first feeding hole is formed in one side, close to the extruder, of the first chamber (1), and the modified plastic strips (5) extruded by the extruder enter the first chamber (1) through the first feeding hole; the conveyor belt (4) is fixed in the first chamber (1) through a conveyor belt fixing seat (24), and the conveying direction of the conveyor belt (4) is consistent with the advancing direction of the modified plastic strip (5); the water spraying pipe (2) is fixed in the first chamber (1) in an S-shaped loop and is positioned above the conveyor belt (4); the spray pipes (2) are uniformly distributed with spray holes (3), and the aperture of the spray holes (3) is gradually increased in the advancing direction of the modified plastic strip (5).

2. The modified plastic particle cutting device according to claim 1, wherein the drying mechanism comprises a second chamber (6), and an upper air knife (7) and a lower air knife (8) fixed in the second chamber (6), the second feed port is arranged at one side of the second chamber (6) close to the first chamber (1), the modified plastic strip (5) reaches the second chamber (6) from the first chamber (1) through the second feed port, the upper air knife (7) is arranged above the modified plastic strip (5) through an air knife fixing mechanism corresponding to the upper air knife, the lower air knife (8) is arranged below the modified plastic strip (5) through an air knife fixing mechanism corresponding to the lower air knife, and the wind cutting direction of the upper air knife (7) and the lower air knife (8) is opposite to the advancing direction of the modified plastic strip (5).

3. The modified plastic particle cutting device according to claim 2, wherein the upper air knife (7) and the lower air knife (8) respectively form an included angle of 32-40 degrees with the plane of the modified plastic strip (5), and the distance between the air knife edge and the modified plastic strip (5) is 15-50 mm.

4. The cutting device for the modified plastic particles as claimed in claim 2, wherein the air knife fixing mechanism is composed of an air knife fixing seat (9), an air knife supporting seat (10) and a fixing shaft (11), the air knife fixing seat (9) is provided with a mounting hole for mounting the fixing shaft (11), two ends of the fixing shaft (11) are provided with threads, the air knife fixing seat (9) is provided with two ends which are oppositely arranged and fixed on the inner wall of the second chamber (6), the air knife supporting seat (10) is fixed on the fixing shaft (11), and two ends of the fixing shaft (11) are respectively fixed through a nut which is in threaded connection with the mounting hole of the air knife fixing seat (9) after passing through the mounting hole of the air knife fixing seat; the upper air knife (7) and the lower air knife (8) are respectively fixed on the air knife supporting seat (10) of the air knife fixing mechanism corresponding to the upper air knife and the lower air knife.

5. The modified plastic particle cutting device according to claim 2, wherein the first chamber (1) is provided with an air inlet (19), the first chamber (1) is externally provided with an air drying box (18), and the first chamber (1) is communicated with the air inlet end of the air drying box (18) through a first air pipe (20); the air outlet end of the air drying box (18) is communicated with the upper air knife (7) through a second air pipe (21) and serves as an air source of the upper air knife (7), and the air outlet end of the air drying box (18) is communicated with the lower air knife (8) through a third air pipe (22) and serves as an air source of the lower air knife (8).

6. The cutting device for the modified plastic particles as claimed in any one of claims 1 to 5, wherein the granulating mechanism is composed of a third chamber (12), a traction roller, a granulating auxiliary table (16) and a cutter (17), and a third feeding port is arranged on one side of the third chamber (12) close to the second chamber (6); in traction roller, cut grain auxiliary station (16) and cutter (17) all were fixed in third chamber (12), traction roller by main traction roller (13) with from traction roller (14) constitute, locate main traction roller (13) from traction roller (14) under, cutter (17) are located main one side of keeping away from the third feed inlet of traction roller (13), cut grain auxiliary station (16) and locate cutter (17) below.

7. The modified plastic particle cutting device according to claim 6, wherein a motor is arranged outside the third chamber (12), and the motor is fixedly connected with the cutter (17) through a speed reducer to drive the cutter (17) to rotate for granulating; a first gear is fixedly sleeved on an output shaft of the motor, a second gear is arranged on a main shaft of the main traction roller (13), a third gear is arranged on a main shaft of the auxiliary traction roller (14), an intermediate gear is arranged between the first gear and the second gear, the first gear is meshed with the second gear through the intermediate gear, and the second gear is meshed with the third gear.

8. The cutting device for modified plastic granules according to claim 6, wherein the main traction roller (13) and the auxiliary traction roller (14) are wound and fixed with a detachable roller water absorption layer (15).

9. A modified plastic particle cutting device according to claim 6, characterized in that the third chamber (12) is provided with an air outlet (23) at the bottom of the side remote from the second chamber (6).

10. The cutting device for the modified plastic particles as claimed in any one of claims 7 to 9, wherein the first chamber (1), the second chamber (6) and the third chamber (12) are formed by arranging a first baffle plate and a second baffle plate in a cuboid shell in sequence, the first feeding port is arranged on one side of the cuboid shell close to the extruder, the second feeding port is arranged on the first baffle plate, and the third feeding port is arranged on the second baffle plate;

the sizes and the positions of the first feed opening, the second feed opening and the third feed opening are consistent in height.

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