CN118650765B - A melting device for processing waste plastics and a waste plastic processing technology - Google Patents

Abstract

The invention discloses a melting device for processing waste plastics and a waste plastic processing technology, which relates to the field of melting devices, including an extrusion barrel, an electric heating wire is wound inside the extrusion barrel, a stirring assembly is arranged inside the extrusion barrel, the stirring assembly includes a fixed inner rod, a rotating outer barrel and a stirring unit; the stirring unit includes a push block and a stirring block, which can drive the stirring block to rotate when the rotating outer barrel rotates, and can make the push block reciprocate when the rotating outer barrel rotates, and can drive the stirring block to swing when the push block reciprocates. The electric heating wire melts the plastic, and when the rotating outer barrel rotates, the stirring block drives the stirring block to rotate inside the extrusion barrel, and when the stirring block rotates inside the extrusion barrel, the molten plastic in the extrusion barrel is stirred circumferentially, so that the molten plastic is mixed more evenly, the color of the molten plastic is more uniform, the performance consistency is higher, the displacement of the molten plastic is larger, the bubbles in the molten plastic are more easily stirred up, and the removal effect of the bubbles in the molten plastic is better.

Description

A melting device for processing waste plastics and a waste plastic processing technology

Technical Field

The invention relates to the field of melting devices, and in particular to a melting device for processing waste plastics and a waste plastic processing technology.

Background Art

With the acceleration of industrialization, plastics have been widely used in packaging, construction, transportation, consumer goods and other fields due to their lightness, durability and low cost, resulting in a sharp increase in plastic production. The use of disposable plastic products (such as plastic bags, beverage bottles, food packaging, etc.) is very common, which has led to the generation of a large amount of plastic waste; although recycling plastic waste is theoretically feasible, in practice, due to inaccurate classification, imperfect recycling system, high processing costs and other reasons, a lot of plastic waste has not been effectively recycled; the difficulty of plastic degradation: most plastic materials are difficult to degrade in the natural environment and may take hundreds of years to completely decompose. Therefore, once discarded, they will exist in the environment for a long time.

The melting of waste plastics refers to the process of heating the waste plastics to a temperature above their melting point to transform them from a solid state to a viscous flow state. This process is one of the key steps in plastic recycling and reuse. The melted plastic can be processed into new plastic products by extrusion, injection molding or blow molding. Before melting, the waste plastics usually need to be pre-processed, including sorting, cleaning and crushing to remove impurities and mixtures of different types of plastics. Sorting is to ensure the consistency of the plastic type during the melting process, because different types of plastics have different melting points and thermal stability.

Chinese patent application CN110497555A discloses a waste plastic melting device, including a shell and a motor, a rotating rod fixedly connected to the output shaft of the motor, the rotating rod passes through one end face of the shell and extends in the shell to the other end face of the shell, a spiral blade is arranged on the outer side of the rotating rod, and the central axis of the spiral blade is colinear with the central axis of the rotating rod; a feed hopper and a discharge port are arranged on the side of the shell, and the feed hopper and the discharge port are connected to the internal space and the external space of the shell; a resistance heating wire is arranged in the wall of the shell, the stirring and mixing effect of the extruder on the waste plastic is significantly increased, the motor load is small and can operate for a long time, and the recycling efficiency is greatly improved.

Chinese patent application CN104354285A discloses a plastic melting device, including a metal cylinder, a conveying rod, a frame, a motor, an insulating and heat-preserving layer and a heating coil. The conveying rod is composed of a round rod and a conveying thread arranged on the surface of the round rod. The conveying rod is arranged in the metal cylinder, and the conveying thread contacts the inner wall of the metal cylinder. A transmission space is formed between the round rod and the metal cylinder under the action of the conveying thread; the motor drives the conveying rod, and the conveying thread divides the two ends of the metal cylinder into a feeding end and a discharging end according to the rotation direction of the motor; an insulating and heat-preserving layer is wrapped around the outer wall of the metal cylinder, and the heating coil is wound on the insulating and heat-preserving layer; the metal cylinder and the motor are arranged on the frame, and the inside of the metal cylinder is heated by the principle of electromagnetic induction heating. The insulating and heat-preserving layer wrapped around the outer wall of the metal cylinder locks the heat in the metal cylinder. Since the metal cylinder is directly heated, the heat transfer process of the heater transferring heat to the metal cylinder is reduced, thereby improving the heating efficiency.

The above patents and prior art also have the following defects:

The prior art requires that the plastic be stirred by a rotating stirring block during plastic melting to increase the heating efficiency of the plastic and mix the plastic. However, there are many types of waste plastics with different properties. The rotating stirring block only has a single circular motion for stirring the molten plastic, and the stirring effect on the molten plastic is limited. The molten plastic has poor mixing degree, resulting in inconsistent properties of different melted plastics. At the same time, the waste plastic will have toxic waste gas and bubble cavities after melting, and the fluidity of the molten plastic is poor. The existing rotating stirring block has a poor stirring effect on the molten plastic, and is unable to stir and discharge the bubbles and waste gas in the molten plastic, resulting in bubbles and cavities in the reproduced plastic.

Therefore, the present application provides a melting device for processing waste plastics and a waste plastic processing process to meet the needs.

Summary of the invention

The purpose of the present application is to provide a melting device for processing waste plastics and a waste plastic processing process. The electric heating wire melts the plastic, and the rotating outer cylinder drives the stirring block to rotate in the extrusion cylinder. When the stirring block rotates in the extrusion cylinder, the molten plastic in the extrusion cylinder is stirred in a circular manner, so that the molten plastic is mixed more evenly, the color of the molten plastic is more uniform, the performance consistency is higher, the displacement of the molten plastic is larger, the bubbles in the molten plastic are more easily stirred up, and the removal effect of the bubbles in the molten plastic is better.

To achieve the above-mentioned purpose, the present application provides the following technical solutions: A melting device for processing waste plastics, comprising an extrusion barrel, a heating wire is wound inside the extrusion barrel, a stirring assembly is arranged inside the extrusion barrel, and the stirring assembly comprises a fixed inner rod, a rotating outer barrel and a stirring unit;

The stirring unit comprises a pushing block and a stirring block. When the rotating outer cylinder rotates, the stirring block can be driven to rotate. When the rotating outer cylinder rotates, the pushing block can be reciprocated. When the pushing block reciprocates, the stirring block can be driven to swing.

The extrusion cylinder is connected with an exhaust pipe.

Preferably, the stirring assembly also includes a fixed gear, and the stirring unit also includes a rotating gear, a reciprocating screw and a moving block, the fixed gear is fixedly sleeved on the fixed inner rod, the rotating gear is meshed with the fixed gear, the reciprocating screw is fixedly installed on the rotating gear, the moving block is sleeved on the reciprocating screw and threadedly cooperates with the moving block, and the pushing block is fixedly installed on the moving block.

Preferably, the stirring unit also includes a sliding bar, two support rods and a sliding rod, the sliding bar is fixedly mounted on an end of the pushing block away from the moving block, a vertical sliding hole is provided on the sliding bar, the sliding rod is fixedly mounted on the two support rods, the sliding rod passes through the vertical sliding hole and slides with the vertical sliding hole.

Preferably, a through hole is provided on the rotating outer cylinder, and the stirring unit also includes a rotating rod, which is fixedly mounted on the support rod and rotatably connected in the through hole. The stirring assembly also includes a support ring and a rotating ring, the outer ring of the support ring is fixedly mounted on the inner wall of the rotating outer cylinder, the inner ring of the support ring is rotatably connected to the fixed inner rod, the rotating gear is rotatably connected to the support ring, the rotating ring is rotatably connected to the fixed inner rod, and the end of the reciprocating screw away from the rotating gear is rotatably connected to the rotating ring.

Preferably, two limit plates are fixedly mounted on the rotating ring, the other ends of the two limit plates are fixedly mounted on the rotating outer cylinder, the pushing block is located between the two limit plates, and the pushing block is slidably matched with the limit plates; the stirring block is fixedly mounted on the support rod, one end of the stirring block is fixedly mounted with a rubber sleeve, the rubber sleeve is fixedly mounted on the rotating outer cylinder, and the support rod is arranged in the rubber sleeve.

Preferably, a feed spiral is provided in a position near one end of the extrusion barrel, and the feed spiral is fixedly sleeved on the rotating outer barrel. The outer ring of the feed spiral is against the extrusion barrel, and the top of the extrusion barrel is fixedly connected to a feed pipe corresponding to the position of the feed spiral, and the top of the feed pipe is fixedly connected to a feed funnel.

Preferably, an extrusion spiral piece is arranged in the end of the extrusion barrel away from the feeding spiral piece, the extrusion spiral piece is fixedly sleeved on the fixed inner rod, the diameter of the extrusion spiral piece is gradually reduced, the diameter of the end of the extrusion barrel corresponding to the extrusion spiral piece is gradually reduced, an extrusion die head is fixedly installed on the end of the extrusion barrel corresponding to the extrusion spiral piece, and a plurality of extrusion holes are opened on the extrusion die head.

Preferably, a blocking rod is provided in the exhaust pipe, the top of the blocking rod passes through the top of the exhaust pipe and is rotatably connected to the exhaust pipe, a blocking motor is fixedly installed on the exhaust pipe, the blocking rod is fixedly installed on the output end of the blocking motor, a blocking spiral sheet is fixedly installed on the blocking rod, a negative pressure pipe is fixedly connected to the exhaust pipe, and a vacuum pump is fixedly installed on the other end of the negative pressure pipe.

Preferably, a base is fixedly installed at the bottom of the extrusion cylinder, fixed plates are fixedly installed at both ends of the base, both ends of the fixed inner rod pass through the extrusion cylinder and are fixedly installed on the corresponding fixed plates, one end of the rotating outer cylinder passes through the extrusion cylinder and is rotatably connected to the extrusion cylinder, the rotating outer cylinder is rotatably connected to the corresponding fixed plate, a rotating motor is fixedly installed on the base, a driving pulley is fixedly installed on the output end of the rotating motor, a passive pulley is fixedly installed on the rotating outer cylinder, and a rotating belt is sleeved on the driving pulley and the passive pulley.

A waste plastic processing technology uses the above-mentioned melting device for processing waste plastics.

In summary, the technical effects and advantages of the present invention are as follows:

1. In the present invention, the electric heating wire melts the plastic, and the rotating outer cylinder drives the stirring block to rotate in the extrusion cylinder. When the stirring block rotates in the extrusion cylinder, the molten plastic in the extrusion cylinder is stirred in a circular manner, so that the molten plastic is mixed more evenly, the color of the molten plastic is more uniform, and the performance consistency is higher;

2. In the present invention, the outer cylinder is rotated at the same time to make the push block reciprocate horizontally, and the push block reciprocates horizontally to make the stirring block swing. The stirring block swings in the process of circular rotation, and the molten plastic swings horizontally, so that the stirring directions of the molten plastic are more, the stirring effect of the molten plastic is better, the displacement of the molten plastic is larger, and the bubbles in the molten plastic are more easily stirred and raised, and the removal effect of the bubbles in the molten plastic is better;

3. In the present invention, the vacuum pump extracts the air in the extrusion barrel through the exhaust pipe, and the air in the exhaust pipe is discharged through the spiral gap of the blocking spiral piece. At the same time, the blocking motor drives the blocking spiral piece to rotate, and the blocking spiral piece pushes the molten plastic entering the exhaust pipe into the extrusion barrel, preventing the molten plastic in the extrusion barrel from entering the exhaust pipe due to pressure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

FIG1 is a schematic structural diagram of a base, a fixing plate, an extrusion barrel, a feed pipe and a feed hopper in the present invention;

FIG2 is a schematic diagram of the structure of the base, the extrusion cylinder, the fixing plate and the exhaust pipe in the present invention;

FIG3 is a schematic diagram of the structure of the extrusion cylinder, the heating wire and the fixing plate of the present invention;

FIG4 is a schematic diagram of the structure of the extrusion barrel, the feed spiral, the stirring assembly, the extrusion spiral and the exhaust pipe in the present invention;

FIG5 is a schematic diagram of the structure of the rotating motor, the rotating outer cylinder, the feeding spiral blade, the stirring unit and the extrusion spiral blade in the present invention;

FIG6 is an enlarged view of part A in FIG5 of the present invention;

FIG7 is a schematic diagram of the structure of the rotating outer cylinder, the extrusion cylinder and the extrusion spiral sheet of the present invention;

FIG8 is an enlarged view of part B in FIG7 of the present invention;

FIG9 is a schematic diagram of the structure of the rotating outer cylinder, the feeding spiral sheet and the extrusion spiral sheet in the present invention;

FIG10 is an enlarged view of portion C in FIG9 of the present invention;

FIG11 is a schematic diagram of the structure of the fixed inner rod, the rotating outer cylinder, the fixed gear and the stirring block in the present invention;

FIG. 12 is an enlarged view of portion D in FIG. 11 of the present invention.

In the figure: 1. extrusion barrel; 2. heating wire; 3. stirring assembly; 31. fixed inner rod; 32. rotating outer barrel; 33. stirring unit; 331. pushing block; 332. stirring block; 333. rotating gear; 334. reciprocating screw; 335. moving block; 336. sliding bar; 337. support rod; 338. sliding rod; 34. fixed gear; 35. rotating ring; 36. supporting ring; 4. exhaust pipe; 5. limiting plate; 6. rubber sleeve; 7. feeding spiral piece; 8. feeding pipe; 9. feeding funnel; 10. extrusion spiral piece; 11. extrusion die; 12. blocking rod; 13. blocking motor; 14. blocking spiral piece; 15. negative pressure pipe; 16. vacuum pump; 17. base; 18. fixed plate; 19. rotating motor.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment: Referring to a melting device for processing waste plastics shown in FIG. 1 to FIG. 12 , the melting device comprises an extrusion barrel 1, a heating wire 2 is wound inside the extrusion barrel 1, a stirring assembly 3 is arranged inside the extrusion barrel 1, and the stirring assembly 3 comprises a fixed inner rod 31, a rotating outer barrel 32 and a stirring unit 33;

The stirring unit 33 includes a pushing block 331 and a stirring block 332. When the rotating outer cylinder 32 rotates, the stirring block 332 can be driven to rotate. When the rotating outer cylinder 32 rotates, the pushing block 331 can be reciprocated. When the pushing block 331 reciprocates, the stirring block 332 can be driven to swing.

The extrusion cylinder 1 is connected to an exhaust pipe 4 .

The crushed plastic is put into the extrusion barrel 1, and the electric heating wire 2 heats the extrusion barrel 1. The crushed plastic is heated and melted. Since there are gaps between the crushed solid plastics, the gaps in the melted plastic are reduced, and there are bubbles in the melted plastic, driving the rotating outer barrel 32 to rotate. The rotating outer barrel 32 drives the stirring block 332 to rotate in the extrusion barrel 1. The stirring block 332 stirs the molten plastic. At the same time, when the rotating outer barrel 32 rotates, the pushing block 331 moves back and forth horizontally. The pushing block 331 makes the stirring block 332 swing horizontally during the rotation process. The stirring block 332 continuously stirs and cuts the molten plastic, and the bubbles in the molten plastic rise to the top of the molten plastic.

The electric heating wire 2 melts the plastic, and the rotating outer cylinder 32 drives the stirring block 332 to rotate in the extrusion cylinder 1. When the stirring block 332 rotates in the extrusion cylinder 1, the molten plastic in the extrusion cylinder 1 is stirred in a circular manner, so that the molten plastic is mixed more evenly, the color of the molten plastic is more uniform, and the performance consistency is higher. At the same time, the rotating outer cylinder 32 rotates to make the pushing block 331 move back and forth horizontally, and the horizontal reciprocating movement of the pushing block 331 makes the stirring block 332 swing. The stirring block 332 swings in the process of circular rotation, and the molten plastic swings horizontally, the stirring directions of the molten plastic are more, the stirring effect of the molten plastic is better, the displacement of the molten plastic is larger, the bubbles in the molten plastic are more easily stirred up, and the removal effect of the bubbles in the molten plastic is better.

Further, referring to Figures 1-12, the stirring assembly 3 also includes a fixed gear 34, and the stirring unit 33 also includes a rotating gear 333, a reciprocating screw 334 and a moving block 335. The fixed gear 34 is fixedly sleeved on the fixed inner rod 31, the rotating gear 333 is meshed with the fixed gear 34, the reciprocating screw 334 is fixedly installed on the rotating gear 333, the moving block 335 is sleeved on the reciprocating screw 334 and threadedly cooperates with the moving block 335, and the pushing block 331 is fixedly installed on the moving block 335.

The rotating outer cylinder 32 drives the stirring unit 33 to rotate when rotating, and the rotating outer cylinder 32 drives the rotating gear 333 to rotate. The rotating gear 333 rotates on itself during the process of rotating around the fixed inner rod 31 on the fixed gear 34. The rotating gear 333 drives the reciprocating screw 334 to rotate, and the moving block 335 reciprocates on the reciprocating screw 334. The moving block 335 drives the pushing block 331 to reciprocate horizontally. The horizontal reciprocating movement of the pushing block 331 causes the stirring block 332 to swing horizontally.

Further, referring to Figures 1 to 12, the stirring unit 33 also includes a sliding bar 336, two support rods 337 and a sliding rod 338. The sliding bar 336 is fixedly installed on the end of the pushing block 331 away from the moving block 335. A vertical sliding hole is opened on the sliding bar 336. The sliding rod 338 is fixedly installed on the two support rods 337. The sliding rod 338 passes through the vertical sliding hole and slides with the vertical sliding hole.

The moving block 335 drives the sliding bar 336 to move back and forth horizontally, the sliding bar 336 drives the sliding rod 338 to move back and forth horizontally, the sliding rod 338 drives one end of the support rod 337 to swing horizontally, the sliding rod 338 can rotate in the sliding hole, the support rod 337 drives the stirring block 332 to swing horizontally, and the support rod 337 drives the sliding rod 338 to move during the rotation, so that the sliding rod 338 moves in the sliding hole.

Further, referring to Figures 1 to 12, a through hole is provided on the rotating outer cylinder 32, the stirring unit 33 also includes a rotating rod, the rotating rod is fixedly mounted on the support rod 337, and the rotating rod is rotatably connected in the through hole, the stirring assembly 3 also includes a support ring 36 and a rotating ring 35, the outer ring of the support ring 36 is fixedly mounted on the inner wall of the rotating outer cylinder 32, the inner ring of the support ring 36 is rotatably connected to the fixed inner rod 31, the rotating gear 333 is rotatably connected to the support ring 36, the rotating ring 35 is rotatably connected to the fixed inner rod 31, and the reciprocating screw 334 is rotatably connected to the rotating ring 35 at one end away from the rotating gear 333.

When the rotating outer cylinder 32 rotates, the supporting ring 36 is driven to rotate, and the supporting ring 36 drives the rotating gear 333 to rotate around the fixed inner rod 31, and the rotating gear 333 drives the reciprocating screw 334 to rotate around the fixed inner rod 31, and the reciprocating screw 334 drives the moving block 335 to rotate.

Further, referring to Figures 1 to 12, two limit plates 5 are fixedly mounted on the rotating ring 35, the other ends of the two limit plates 5 are fixedly mounted on the rotating outer cylinder 32, the pushing block 331 is located between the two limit plates 5, and the pushing block 331 slides with the limit plates 5; the stirring block 332 is fixedly mounted on the support rod 337, one end of the stirring block 332 is fixedly mounted with a rubber sleeve 6, the rubber sleeve 6 is fixedly mounted on the rotating outer cylinder 32, and the support rod 337 is arranged in the rubber sleeve 6.

The rotating outer cylinder 32 drives the rotating ring 35 to rotate through the limiting plates 5, and the movement of the pushing block 331 between the two limiting plates 5 makes the pushing block 331 move more stably and not easy to shake.

Further, referring to FIGS. 1 to 12 , a feed spiral piece 7 is provided in a position near one end of the extrusion cylinder 1, and the feed spiral piece 7 is fixedly sleeved on the rotating outer cylinder 32, and the outer ring of the feed spiral piece 7 abuts against the extrusion cylinder 1, and a feed pipe 8 is fixedly connected to the top of the extrusion cylinder 1 corresponding to the position of the feed spiral piece 7, and a feed funnel 9 is fixedly connected to the top of the feed pipe 8;

The plastic is placed in the feed hopper 9, and the plastic enters the extrusion barrel 1. When the outer barrel 32 is rotated, the feed spiral blade 7 is driven to rotate, and the feed spiral blade 7 drives the plastic in the extrusion barrel 1 to move. During the movement of the plastic, the heating wire 2 melts the plastic, and the molten plastic continues to be pushed and moved by the feed spiral blade 7. The molten plastic is pushed to the position of the stirring unit 33, and the stirring unit 33 stirs the molten plastic.

Further, referring to Figures 1 to 12, an extrusion spiral piece 10 is provided in the end of the extrusion barrel 1 away from the feeding spiral piece 7. The extrusion spiral piece 10 is fixedly sleeved on the fixed inner rod 31. The diameter of the extrusion spiral piece 10 is gradually reduced. The diameter of the end of the extrusion barrel 1 corresponding to the extrusion spiral piece 10 is gradually reduced. An extrusion die head 11 is fixedly installed on the end of the extrusion barrel 1 corresponding to the extrusion spiral piece 10, and a plurality of extrusion holes are opened on the extrusion die head 11.

The continuously fed plastic is pushed by the feeding spiral 7, and the molten plastic enters the extrusion spiral 10 through the stirring unit 33. The rotating outer cylinder 32 drives the extrusion spiral 10 to rotate, and the molten plastic on the extrusion spiral 10 is pushed forward. The extrusion cylinder 1 and the extrusion spiral 10 with gradually decreasing diameters gradually pressurize the molten plastic and extrude the molten plastic from the extrusion hole of the extrusion die 11.

Further, referring to Figures 1 to 12, a blocking rod 12 is provided in the exhaust pipe 4, the top of the blocking rod 12 passes through the top of the exhaust pipe 4 and is rotatably connected to the exhaust pipe 4, a blocking motor 13 is fixedly installed on the exhaust pipe 4, the blocking rod 12 is fixedly installed on the output end of the blocking motor 13, a blocking spiral piece 14 is fixedly installed on the blocking rod 12, a negative pressure pipe 15 is fixedly connected to the exhaust pipe 4, and a vacuum pump 16 is fixedly installed on the other end of the negative pressure pipe 15.

The vacuum pump 16 extracts the air in the extrusion barrel 1 through the exhaust pipe 4, and the air in the exhaust pipe 4 is discharged through the spiral gap of the blocking spiral piece 14. At the same time, the blocking motor 13 drives the blocking spiral piece 14 to rotate, and the blocking spiral piece 14 pushes the molten plastic entering the exhaust pipe 4 into the extrusion barrel 1, preventing the molten plastic in the extrusion barrel 1 from entering the exhaust pipe 4 due to pressure.

Further, referring to Figures 1 to 12, a base 17 is fixedly installed at the bottom of the extrusion cylinder 1, and fixed plates 18 are fixedly installed at both ends of the base 17. Both ends of the fixed inner rod 31 pass through the extrusion cylinder 1 and are fixedly installed on the corresponding fixed plates 18. One end of the rotating outer cylinder 32 passes through the extrusion cylinder 1 and is rotatably connected to the extrusion cylinder 1. The rotating outer cylinder 32 is rotatably connected to the corresponding fixed plate 18. A rotating motor 19 is fixedly installed on the base 17. A driving pulley is fixedly installed on the output end of the rotating motor 19, and a passive pulley is fixedly installed on the rotating outer cylinder 32. A rotating belt is sleeved on the driving pulley and the passive pulley.

The rotating motor 19 drives the active pulley to rotate, the active pulley drives the rotating belt to rotate, the rotating belt causes the passive pulley to rotate, and the passive pulley drives the rotating outer cylinder 32 to rotate.

A waste plastic processing technology uses the above-mentioned melting device for processing waste plastics.

Working principle: waste plastics are sorted, cleaned and shredded, and the shredded plastics are put into the feeding funnel 9. The plastics enter the extrusion barrel 1 through the feeding pipe 8. The rotating motor 19 drives the active pulley to rotate, and the active pulley drives the passive pulley to rotate. The passive pulley drives the rotating outer barrel 32 to rotate, and the rotating outer barrel 32 drives the feeding spiral piece 7 to rotate. The feeding spiral piece 7 pushes the plastic entering the extrusion barrel 1. The electric heating wire 2 heats the extrusion barrel 1, and the plastic is melted. The molten plastic continues to be pushed into the stirring unit 33 position, and the rotating outer barrel 32 drives the support ring 36 to rotate. The support ring 36 drives the rotating gear 333 to rotate. The rotating gear 333 rotates during the movement on the fixed gear 34. The rotating gear 333 drives the reciprocating screw 334 to rotate. The moving block 335 reciprocates on the reciprocating screw 334. The moving block 335 drives the sliding bar 336 to move. The sliding bar 336 drives the sliding rod 338 to move. The movable rod 338 drives one end of the support rod 337 to move horizontally back and forth. When one end of the support rod 337 moves horizontally back and forth, the other end swings horizontally. The support rod 337 drives the stirring block 332 to swing horizontally, so that the stirring block 332 swings horizontally during the rotation process, and the molten plastic is stirred. The molten plastic is stirred more evenly, the bubbles in the molten plastic are stirred and broken, and the internal air rises and is discharged through the exhaust pipe 4. The blocking motor 13 drives the blocking spiral piece 14 in the exhaust pipe 4 to rotate, and the blocking spiral piece 14 will enter the molten plastic in the exhaust pipe 4 and discharge it. The molten plastic continues to move into the position of the extrusion spiral piece 10, and the rotating outer cylinder 32 drives the extrusion spiral piece 10 to rotate, and the extrusion spiral piece 10 pushes the molten plastic. At the same time, the diameters of the extrusion cylinder 1 and the extrusion spiral piece 10 gradually decrease to pressurize the molten plastic, and the molten plastic is extruded through the extrusion hole of the extrusion die head 11. Subsequently, a pelletizer is preferably used to pelletize the extruded molten plastic.

Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (7)

1. A melting device for processing waste plastics, comprising an extrusion barrel (1), wherein an electric heating wire (2) is wound inside the extrusion barrel (1), and characterized in that a stirring assembly (3) is arranged inside the extrusion barrel (1), and the stirring assembly (3) comprises a fixed inner rod (31), a rotating outer barrel (32) and a stirring unit (33); The stirring unit (33) comprises a pushing block (331) and a stirring block (332); when the rotating outer cylinder (32) rotates, the stirring block (332) can be driven to rotate; when the rotating outer cylinder (32) rotates, the pushing block (331) can be caused to reciprocate; and when the pushing block (331) reciprocates, the stirring block (332) can be driven to swing; The extrusion barrel (1) is connected to an exhaust pipe (4); The stirring assembly (3) further comprises a fixed gear (34); the stirring unit (33) further comprises a rotating gear (333), a reciprocating screw (334) and a moving block (335); the fixed gear (34) is fixedly sleeved on the fixed inner rod (31); the rotating gear (333) is meshed with the fixed gear (34); the reciprocating screw (334) is fixedly mounted on the rotating gear (333); the moving block (335) is sleeved on the reciprocating screw (334) and threadedly engaged with the moving block (335); and the pushing block (331) is fixedly mounted on the moving block (335); The stirring unit (33) further comprises a sliding bar (336), two supporting rods (337) and a sliding rod (338); the sliding bar (336) is fixedly mounted on an end of the pushing block (331) away from the moving block (335); a vertical sliding hole is formed on the sliding bar (336); the sliding rod (338) is fixedly mounted on the two supporting rods (337); the sliding rod (338) passes through the vertical sliding hole and slides with the vertical sliding hole; The rotating outer cylinder (32) is provided with a through hole. The stirring unit (33) further comprises a rotating rod, which is fixedly mounted on the support rod (337) and rotatably connected in the through hole. The stirring assembly (3) further comprises a supporting ring (36) and a rotating ring (35). The outer ring of the supporting ring (36) is fixedly mounted on the inner wall of the rotating outer cylinder (32). The inner ring of the supporting ring (36) is rotatably connected to the fixed inner rod (31). The rotating gear (333) is rotatably connected to the supporting ring (36). The rotating ring (35) is rotatably connected to the fixed inner rod (31). The end of the reciprocating screw (334) away from the rotating gear (333) is rotatably connected to the rotating ring (35). 2. A melting device for processing waste plastics according to claim 1, characterized in that: two limit plates (5) are fixedly mounted on the rotating ring (35), the other ends of the two limit plates (5) are fixedly mounted on the rotating outer cylinder (32), the pushing block (331) is located between the two limit plates (5), and the pushing block (331) and the limit plates (5) are slidably matched; the stirring block (332) is fixedly mounted on the support rod (337), one end of the stirring block (332) is fixedly mounted with a rubber sleeve (6), the rubber sleeve (6) is fixedly mounted on the rotating outer cylinder (32), and the support rod (337) is arranged in the rubber sleeve (6). 3. A melting device for processing waste plastics according to claim 1, characterized in that: a feed spiral piece (7) is arranged near one end of the extrusion barrel (1), the feed spiral piece (7) is fixedly sleeved on the rotating outer barrel (32), the outer ring of the feed spiral piece (7) is against the extrusion barrel (1), the top of the extrusion barrel (1) corresponds to the position of the feed spiral piece (7) and is fixedly connected to a feed pipe (8), and the top of the feed pipe (8) is fixedly connected to a feed funnel (9). 4. A melting device for processing waste plastics according to claim 3, characterized in that: an extrusion spiral piece (10) is arranged inside the end of the extrusion barrel (1) away from the feeding spiral piece (7), the extrusion spiral piece (10) is fixedly sleeved on the fixed inner rod (31), the diameter of the extrusion spiral piece (10) is arranged to gradually decrease, the diameter of the end of the extrusion barrel (1) corresponding to the extrusion spiral piece (10) is arranged to gradually decrease, and an extrusion die head (11) is fixedly installed on the end of the extrusion barrel (1) corresponding to the extrusion spiral piece (10), and a plurality of extrusion holes are opened on the extrusion die head (11). 5. A melting device for processing waste plastics according to claim 1, characterized in that: a blocking rod (12) is arranged in the exhaust pipe (4), the top of the blocking rod (12) passes through the top of the exhaust pipe (4) and is rotatably connected to the exhaust pipe (4), a blocking motor (13) is fixedly installed on the exhaust pipe (4), the blocking rod (12) is fixedly installed on the output end of the blocking motor (13), a blocking spiral piece (14) is fixedly installed on the blocking rod (12), a negative pressure pipe (15) is fixedly connected to the exhaust pipe (4), and a vacuum pump (16) is fixedly installed on the other end of the negative pressure pipe (15). 6. A melting device for processing waste plastics according to claim 1, characterized in that: a base (17) is fixedly installed at the bottom of the extrusion cylinder (1), and fixed plates (18) are fixedly installed at both ends of the base (17), and both ends of the fixed inner rod (31) pass through the extrusion cylinder (1) and are fixedly installed on the corresponding fixed plates (18), one end of the rotating outer cylinder (32) passes through the extrusion cylinder (1) and is rotatably connected to the extrusion cylinder (1), and the rotating outer cylinder (32) is rotatably connected to the corresponding fixed plate (18), a rotating motor (19) is fixedly installed on the base (17), a driving pulley is fixedly installed on the output end of the rotating motor (19), and a passive pulley is fixedly installed on the rotating outer cylinder (32), and a rotating belt is sleeved on the driving pulley and the passive pulley. 7. A waste plastic processing process, characterized in that: a melting device for processing waste plastics as described in any one of claims 1 to 6 is used.