Granulator for recycling and reproducing waste plastic

Abstract

The invention belongs to the technical field of plastic waste recovery, and particularly relates to a waste plastic recovery and reproduction granulator which comprises a melting bin, the bottom of the melting bin is connected with an extruder, and the extruder is connected with a cutting assembly; a feeding hole and an air pipe are mounted at the top of the melting bin; the air pipe is connected with the spray tower; the interior of the melting bin is divided into a heating chamber and a constant-temperature chamber, and a separation assembly is installed in the melting bin and located between the heating chamber and the constant-temperature chamber. Harmful gas with the density larger than that of air sinks after being generated and flows towards the first through hole disc along with molten plastic through a supporting through hole disc, the molten plastic pushes the first through hole disc and the second through hole disc to move downwards under the action of gravity, and meanwhile a piston moves downwards; the piston sucks harmful gas with the density larger than that of air into the hollow annular table through the air suction hole, so that the molten plastic is separated from the harmful gas, and the situation that the harmful gas is dissolved in the molten plastic, small gaps are formed in the cooled and cured plastic, and the material density is reduced is avoided.

Description

Technical Field

[0001] This invention belongs to the field of plastic waste recycling technology, and specifically relates to a granulator for recycling and reproducing waste plastics. Background Technology

[0002] Waste plastic recycling technology is an important environmental protection measure aimed at reducing plastic pollution and achieving resource recycling, mainly through melt recycling technology. Current waste plastic recycling processes require pre-treated waste plastic to be melted in a plastic pelletizer, extruded into strips using an extruder, and finally cut into uniformly sized plastic pellets using a feeder.

[0003] Waste plastics produce harmful gases during the melting process. The release of these harmful gases mainly occurs during the transition from solid to liquid state of the plastic. The existing treatment method involves passing the harmful gases into a spray tower to remove them. However, this method has the following technical problems. The harmful gases produced by melting waste plastics are divided into two types: those with a density greater than that of air and those with a density less than that of air. The less dense gases rise after being generated and easily enter the spray tower through pipes. However, some of the more dense gases (such as CO2, SO2, and HCl) quickly settle downwards after being generated, becoming suspended in the molten plastic and making it difficult to enter the spray tower through pipes. Furthermore, these harmful gases can dissolve again in the molten plastic, forming tiny voids when the plastic cools and solidifies, leading to a decrease in material density and weakened mechanical strength. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a granulator for recycling and reproducing waste plastics, thereby solving the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solution: a granulator for recycling and reproducing waste plastics, comprising a melting chamber, an extruder connected to the bottom of the melting chamber, and a cutting assembly connected to the extruder; a feed inlet and an air pipe installed at the top of the melting chamber, the air pipe being connected to a spray tower; the interior of the melting chamber is divided into a heating chamber and a constant temperature chamber, and a separation assembly is installed inside the melting chamber, located between the heating chamber and the constant temperature chamber; the separation assembly includes a hollow ring platform installed on the inner wall of the melting chamber, a supporting through-hole plate fixedly installed at the top of the hollow ring platform, a guide column platform installed on the supporting through-hole plate, a second through-hole plate slidably installed on the guide column platform, a first through-hole plate rotatably installed at the top of the second through-hole plate, a return spring installed at the bottom of the second through-hole plate, and the second through-hole plate connected to the guide column platform via the return spring; a guide rod connected to the bottom of the second through-hole plate via a base, a piston installed on the guide rod, the piston sliding inside the hollow ring platform, and an exhaust hole opened on the inner side wall of the hollow ring platform.

[0006] As a further optimization or improvement of this solution, a J-shaped slide groove and a strip-shaped slide groove are respectively opened on the guide column platform. A slider 2 and a slider 1 are respectively installed on the through hole plate 1 and through hole plate 2. The through hole plate 1 slides with the J-shaped slide groove through the slider 2, and the through hole plate 2 slides with the strip-shaped slide groove through the slider 1.

[0007] As a further optimization or improvement of this solution, an exhaust port is installed on the top of the hollow ring platform; when the through-hole plate two moves the piston downward, the suction port opens and the exhaust port closes; when the through-hole plate two moves the piston upward, the suction port closes and the exhaust port opens.

[0008] As a further optimization or improvement of this solution, a U-shaped rod is slidably installed on the inner wall of the hollow ring platform, and a side wall hole is opened on the U-shaped rod. A top plate is slidably installed at the top of the inner cavity of the hollow ring platform, and a plate hole is opened on the top plate. The U-shaped rod is connected to the top plate through a connecting rod, and the U-shaped rod is connected to the inner wall of the hollow ring platform through a spring.

[0009] As a further optimization or improvement of this solution, an upper limit groove and a lower limit groove are respectively opened on the inner wall of the hollow ring platform, and a U-shaped rod is installed on the U-shaped rod; when the piston drives the U-shaped rod to move downward, the telescopic ball head is engaged in the lower limit groove; when the piston drives the U-shaped rod to move upward, the telescopic ball head is engaged in the upper limit groove.

[0010] As a further optimization or improvement of this solution, an inlet is installed on the side wall of the hollow ring platform, and a drain outlet is installed at the bottom of the hollow ring platform; a drain pipe is installed at the bottom of the through-hole plate two, and the drain pipe is connected to the through hole on the through-hole plate two.

[0011] As a further optimization or improvement of this solution, the extruder includes an extrusion tube, the bottom of the melting chamber is connected to the extrusion tube, and a pusher screw is installed inside the extrusion tube, which is driven by a motor.

[0012] The beneficial effects of this invention are: (1) In this invention, the harmful gas with a density greater than that of air sinks after being generated and flows with the molten plastic through the support through-hole plate towards the through-hole plate one. Under the action of gravity, the molten plastic pushes through-hole plate one and through-hole plate two to move downward. At the same time, the piston moves downward. The piston draws the harmful gas with a density greater than that of air into the hollow ring through the air extraction hole, so that the molten plastic is separated from the harmful gas, and the harmful gas is prevented from dissolving in the molten plastic, which would cause the plastic to form micropores after cooling and solidification, and the material density would decrease. Furthermore, as the through-hole plate one and through-hole plate two move downwards, the molten plastic enters the constant temperature chamber through the through-holes on through-hole plate one and through-hole plate two. The return spring rebounds, and the return spring drives through-hole plate two and piston to move upwards. The piston pushes the harmful gas with a density greater than air in the hollow ring platform upwards and discharges it from the hollow ring platform. Under the push of the piston, the harmful gas approaches the gas pipe, making it easier for the harmful gas with a density greater than air to enter the spray tower through the gas pipe.

[0013] (2) In order to prevent harmful gases with a density greater than that of air from directly entering the constant temperature chamber through gap a, the present invention promotes the dissolution of harmful gases in the molten plastic in the constant temperature chamber, thereby causing the material density to decrease; This invention injects an oily substance into the constant temperature chamber. The density of the oily substance is lower than that of common thermoplastic melts. When the two are mixed, the oily substance will gradually float to the surface of the molten plastic due to buoyancy, forming a clear interface, thereby preventing harmful gases from dissolving in the molten plastic in the constant temperature chamber. Furthermore, when the molten plastic on the through-hole plate 1 enters the constant temperature chamber through the through-holes on through-hole plate 1 and through-hole plate 2, the falling molten plastic will damage the oil film layer, allowing harmful gases to take the opportunity to integrate into the molten plastic. Therefore, this invention provides a drain pipe at the bottom of through-hole plate 2. When through-hole plate 2 moves down, the drain pipe is inserted into the molten plastic in the constant temperature chamber, allowing the solution plastic on through-hole plate 1 to flow into the molten plastic in the constant temperature chamber through the drain pipe, thereby preventing the molten plastic from falling and damaging the oil film layer. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is a front view of the overall structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the internal structure of the melting chamber.

[0018] Figure 4 This is an exploded view of the overall structure of the separated components.

[0019] Figure 5 This is a cross-sectional view of the overall structure of the separated components.

[0020] Figure 6 This is a schematic diagram of the connection structure between the guide post platform and through-hole plate one and through-hole plate two.

[0021] Figure 7 for Figure 6 Enlarged view of the structure of part A.

[0022] Figure 8 This is a cross-sectional view of the front structure of the separated components.

[0023] Figure 9 for Figure 8 Enlarged view of the structure of part B.

[0024] Figure 10 for Figure 9 Enlarged view of the structure of part C.

[0025] The diagram indicates: 1. Melting chamber; 101. Heating chamber; 102. Constant temperature chamber; 2. Feed inlet; 3. Air pipe; 4. Extruder; 401. Extrusion tube; 402. Motor; 403. Push screw; 5. Cutting assembly; 6. Separation Components; 601. Hollow Ring Platform; 602. Support Through-hole Plate; 603. Through-hole Plate One; 604. Through-hole Plate Two; 605. Drain Pipe; 606. Guide Post Platform; 607. Return Spring; 608. J-shaped Slide Groove; 609. Strip Slide Groove; 610. Slider One; 611. Slider Two; 612. Base; 613. Guide Rod; 614. Piston; 615. Exhaust Hole; 616. Suction Hole; 617. Liquid Inlet; 618. Drain Port; 619. Top Plate; 620. Plate Hole; 621. Connecting Rod; 622. U-shaped Rod; 623. Side Wall Hole; 624. Spring One; 625. Upper Limit Groove; 626. Lower Limit Groove; 627. Telescopic Ball Head. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] See Figures 2-10 A granulator for recycling and reproducing waste plastics includes a melting chamber 1, with an extruder 4 connected to the bottom of the melting chamber 1 and a cutting assembly 5 connected to the extruder 4. A feed inlet 2 and an air pipe 3 are installed at the top of the melting chamber 1, with the air pipe 3 connected to a spray tower. The interior of the melting chamber 1 is divided into a heating chamber 101 and a constant temperature chamber 102. A separation assembly 6 is installed inside the melting chamber 1, located between the heating chamber 101 and the constant temperature chamber 102. The separation assembly 6 includes a hollow ring platform 601 installed on the inner wall of the melting chamber 1, with a support through hole fixedly installed at the top of the hollow ring platform 601. A guide post 606 is installed on a support plate 602, and a second through-hole plate 604 is slidably installed on the guide post 606. A first through-hole plate 603 is rotatably installed on the top of the second through-hole plate 604, and a return spring 607 is installed at the bottom of the second through-hole plate 604. The second through-hole plate 604 is connected to the guide post 606 through the return spring 607. The bottom of the second through-hole plate 604 is connected to a guide rod 613 through a base 612. A piston 614 is installed on the guide rod 613 and slides inside the hollow ring platform 601. An air extraction hole 616 is opened on the inner side wall of the hollow ring platform 601.

[0028] Specifically, the guide post 606 is provided with a J-shaped groove 608 and a strip groove 609 respectively. The through hole plate 603 and the through hole plate 604 are respectively equipped with a slider 611 and a slider 610. The through hole plate 603 slides with the J-shaped groove 608 through the slider 611, and the through hole plate 604 slides with the strip groove 609 through the slider 610.

[0029] Specifically, an exhaust port 615 is installed on the top of the hollow ring platform 601; when the through-hole plate 604 drives the piston 614 to move downward, the suction port 616 opens and the exhaust port 615 closes; when the through-hole plate 604 drives the piston 614 to move upward, the suction port 616 closes and the exhaust port 615 opens.

[0030] Specifically, a U-shaped rod 622 is slidably installed on the inner wall of the hollow ring platform 601, and a side wall hole 623 is formed on the U-shaped rod 622. A top plate 619 is slidably installed on the top of the inner cavity of the hollow ring platform 601, and a plate hole 620 is formed on the top plate 619. The U-shaped rod 622 is connected to the top plate 619 through a connecting rod 621, and the U-shaped rod 622 is connected to the inner wall of the hollow ring platform 601 through a spring 624.

[0031] The hollow ring platform 601 has an upper limit groove 625 and a lower limit groove 626 respectively opened on the inner cavity side wall, and a U-shaped rod 622 is installed on the U-shaped rod 622; when the piston 614 drives the U-shaped rod 622 to move downward, the telescopic ball head 627 is engaged in the lower limit groove 626; when the piston 614 drives the U-shaped rod 622 to move upward, the telescopic ball head 627 is engaged in the upper limit groove 625.

[0032] It should be noted that, in the initial state, the through holes on through-hole plate 1 603 and through-hole plate 2 604 are staggered. At this time, through-hole plate 1 603 and through-hole plate 2 604 can block the molten plastic from passing through; the side wall hole 623 on the U-shaped rod 622 coincides with the air extraction hole 616, and the top plate 619 blocks the exhaust hole 615.

[0033] It should be noted that, in use, the pre-treated waste plastic is fed into the heating chamber 101 of the melting chamber 1 through the feed inlet 2. At this time, the solid plastic is supported by the supporting perforated plate 602. As the internal temperature of the heating chamber 101 rises, the solid plastic melts and generates harmful gases. The harmful gases with a density less than air rise and enter the spray tower through the gas pipe 3, while the harmful gases with a density greater than air sink after being generated and flow with the molten plastic through the supporting perforated plate 602 towards the perforated plate 603. At this time, the perforated plate 603 and the perforated plate 604 support the liquid plastic. The through holes on the first through-hole plate 603 and the second through-hole plate 604 are staggered. Under the action of gravity, the molten plastic pushes the first through-hole plate 603 and the second through-hole plate 604 to move downward. The return spring 607 is compressed. The second through-hole plate 604 drives the piston 614 to move downward synchronously through the base 612 and the guide rod 613. As the piston 614 moves downward, the piston 614 draws harmful gas with a density greater than air into the hollow ring platform 601 through the air extraction hole 616, so that the molten plastic is separated from the harmful gas, and the harmful gas is prevented from dissolving in the molten plastic, which would cause the plastic to form tiny voids after cooling and solidification, and the material density would decrease. When the through-hole plate 603 and through-hole plate 604 move down to a certain position, the piston 614 drives the U-shaped rod 622 to move down synchronously, so that the telescopic ball head 627 on the U-shaped rod 622 is engaged in the lower limit groove 626. At this time, the U-shaped rod 622 blocks the exhaust hole 616. As the U-shaped rod 622 moves down, it drives the top plate 619 to move, so that the plate hole 620 on the top plate 619 coincides with the exhaust hole 615. At the same time, through the cooperation between the slider 611 on the through-hole plate 603 and the J-shaped groove 608 on the guide column 606, the through-hole plate 603 rotates, so that the through hole on the through-hole plate 603 coincides with the through hole on the through-hole plate 604. The molten plastic quickly enters the constant temperature chamber 102 through the through holes on the through-hole plate 603 and through-hole plate 604.

[0034] As the molten plastic enters the constant temperature chamber 102, the through-hole plate 604 and the through-hole plate 603 move upward under the action of the return spring 607. The through-hole plate 604 drives the piston 614 to move upward synchronously. The piston 614 pushes the harmful gas with a density greater than air in the hollow ring platform 601 upward to discharge the hollow ring platform 601. Under the push of the piston 614, the harmful gas approaches the gas pipe 3, making it easier for the harmful gas with a density greater than air to enter the spray tower through the gas pipe 3.

[0035] Once the molten plastic in the constant temperature chamber 102 reaches a certain amount, the gate valve between the melting chamber 1 and the extrusion pipe 401 is opened to carry out plastic production operations.

[0036] It should be noted that the through holes on through-hole plate 1 (603) and through-hole plate 2 (604) are generally large in diameter, so that when the through holes on through-hole plate 1 (603) and through-hole plate 2 (604) coincide, the molten plastic can quickly enter the constant temperature chamber 102 through the through holes on through-hole plate 1 (603) and through-hole plate 2 (604).

[0037] See Figures 3-9 A liquid inlet 617 is installed on the side wall of the hollow ring platform 601, and a liquid outlet 618 is installed at the bottom of the hollow ring platform 601; a liquid outlet pipe 605 is installed at the bottom of the through-hole plate 604, and the liquid outlet pipe 605 is connected to the through hole on the through-hole plate 604.

[0038] In order to prevent harmful gases with a density greater than air from directly entering the constant temperature chamber 102 through the 7a gap, the present invention promotes the dissolution of harmful gases in the molten plastic in the constant temperature chamber 102, thereby causing a decrease in material density.

[0039] In this invention, oil is injected into the hollow ring platform 601 through the inlet 617. As the hollow ring platform 601 moves downward, the oil is injected into the constant temperature chamber 102 through the outlet 618. The density of oily substances is lower than that of common thermoplastic melts. When the two are mixed, the oil will gradually float to the surface of the molten plastic due to buoyancy, forming a clear interface, thereby preventing harmful gases from dissolving in the molten plastic in the constant temperature chamber 102. Furthermore, when the molten plastic on the through-hole plate 603 enters the constant temperature chamber 102 through the through holes on the through-hole plate 603 and the through-hole plate 604, the falling molten plastic will damage the oil film layer, allowing harmful gases to integrate into the molten plastic. Therefore, this invention provides a drain pipe 605 at the bottom of the through-hole plate 604, which is connected to the through hole on the through-hole plate 604. As the through-hole plate 604 moves down, the drain pipe 605 is inserted into the molten plastic in the constant temperature chamber 102, allowing the solution plastic on the through-hole plate 603 to flow into the molten plastic in the constant temperature chamber 102 through the drain pipe 605, thereby preventing the molten plastic from falling and damaging the oil film layer.

[0040] It should be noted that nitrogen can be used instead of oil in this invention, and the nitrogen protective layer can also achieve the function of isolating harmful gases.

[0041] See Figure 1 and Figure 2 The extruder 4 includes an extrusion tube 401, the bottom of the melting chamber 1 is connected to the extrusion tube 401, and a pusher screw 403 is installed inside the extrusion tube 401. The pusher screw 403 is driven by a motor 402.

[0042] It should be noted that the molten plastic in the constant temperature chamber 102 is fed into the extrusion tube 401, and the plastic is pushed and extruded by the pusher screw 403. After the plastic is cooled by air, it is cut by the cutting component 5 to cut the material into plastic granules of uniform size.

[0043] The implementation principle of this invention is as follows: During use, pre-treated waste plastic is fed into the heating chamber 101 of the melting tank 1 through the feed inlet 2. At this time, the solid plastic is supported by the supporting perforated plate 602. As the internal temperature of the heating chamber 101 rises, the solid plastic melts and generates harmful gases. The harmful gases with a density less than air rise and enter the spray tower through the gas pipe 3, while the harmful gases with a density greater than air sink after being generated and flow with the molten plastic through the supporting perforated plate 602 towards the first perforated plate 603. At this time, the first perforated plate 603 and the second perforated plate 604 support the liquid plastic. The through holes on the first through-hole plate 603 and the second through-hole plate 604 are staggered. Under the action of gravity, the molten plastic pushes the first through-hole plate 603 and the second through-hole plate 604 to move downward. The return spring 607 is compressed. The second through-hole plate 604 drives the piston 614 to move downward synchronously through the base 612 and the guide rod 613. As the piston 614 moves downward, the piston 614 draws harmful gas with a density greater than air into the hollow ring platform 601 through the air extraction hole 616, so that the molten plastic is separated from the harmful gas, and the harmful gas is prevented from dissolving in the molten plastic, which would cause the plastic to form tiny voids after cooling and solidification, and the material density would decrease. When the through-hole plate 603 and through-hole plate 604 move down to a certain position, the piston 614 drives the U-shaped rod 622 to move down synchronously, so that the telescopic ball head 627 on the U-shaped rod 622 is engaged in the lower limit groove 626. At this time, the U-shaped rod 622 blocks the exhaust hole 616. As the U-shaped rod 622 moves down, it drives the top plate 619 to move, so that the plate hole 620 on the top plate 619 coincides with the exhaust hole 615. At the same time, through the cooperation between the slider 611 on the through-hole plate 603 and the J-shaped groove 608 on the guide column 606, the through-hole plate 603 rotates, so that the through hole on the through-hole plate 603 coincides with the through hole on the through-hole plate 604. The molten plastic quickly enters the constant temperature chamber 102 through the through holes on the through-hole plate 603 and through-hole plate 604.

[0044] As the molten plastic enters the constant temperature chamber 102, the through-hole plate 604 and the through-hole plate 603 move upward under the action of the return spring 607. The through-hole plate 604 drives the piston 614 to move upward synchronously. The piston 614 pushes the harmful gas with a density greater than air in the hollow ring platform 601 upward to discharge the hollow ring platform 601. Under the push of the piston 614, the harmful gas approaches the gas pipe 3, making it easier for the harmful gas with a density greater than air to enter the spray tower through the gas pipe 3.

[0045] In order to prevent harmful gases with a density greater than air from directly entering the constant temperature chamber 102 through the 7a gap, the present invention promotes the dissolution of harmful gases in the molten plastic in the constant temperature chamber 102, thereby causing a decrease in material density.

[0046] In this invention, oil is injected into the hollow ring platform 601 through the inlet 617. As the hollow ring platform 601 moves downward, the oil is injected into the constant temperature chamber 102 through the outlet 618. The density of oily substances is lower than that of common thermoplastic melts. When the two are mixed, the oil will gradually float to the surface of the molten plastic due to buoyancy, forming a clear interface, thereby preventing harmful gases from dissolving in the molten plastic in the constant temperature chamber 102. Furthermore, when the molten plastic on the through-hole plate 603 enters the constant temperature chamber 102 through the through holes on the through-hole plate 603 and the through-hole plate 604, the falling molten plastic will damage the oil film layer, allowing harmful gases to integrate into the molten plastic. Therefore, this invention provides a drain pipe 605 at the bottom of the through-hole plate 604, which is connected to the through hole on the through-hole plate 604. As the through-hole plate 604 moves down, the drain pipe 605 is inserted into the molten plastic in the constant temperature chamber 102, allowing the solution plastic on the through-hole plate 603 to flow into the molten plastic in the constant temperature chamber 102 through the drain pipe 605, thereby preventing the molten plastic from falling and damaging the oil film layer.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A pelletizing machine for recycling and reproducing waste plastics, characterized in that: It includes a melting chamber (1), the bottom of which is connected to an extruder (4), and the extruder (4) is connected to a cutting assembly (5); the top of the melting chamber (1) is equipped with a feed inlet (2) and an air pipe (3), and the air pipe (3) is connected to a spray tower; The melting chamber (1) is divided into a heating chamber (101) and a constant temperature chamber (102). A separation component (6) is installed inside the melting chamber (1) and is located between the heating chamber (101) and the constant temperature chamber (102). The separation component (6) includes a hollow ring platform (601) installed on the inner wall of the melting chamber (1). A support through-hole plate (602) is fixedly installed on the top of the hollow ring platform (601). A guide column platform (606) is installed on the support through-hole plate (602). A second through-hole plate (604) is slidably installed on the guide column platform (606). A first through-hole plate (603) is rotatably installed on the top of the second through-hole plate (604). A return spring (607) is installed at the bottom of the second through-hole plate (604). The second through-hole plate (604) is connected to the guide column platform (606) through the return spring (607). The bottom of the through-hole plate (604) is connected to the guide rod (613) via the base (612). The piston (614) is installed on the guide rod (613). The piston (614) slides inside the hollow ring platform (601). An air extraction hole (616) is opened on the inner side wall of the hollow ring platform (601).

2. The granulator for recycling and reproducing waste plastics according to claim 1, characterized in that: The guide post (606) is provided with a J-shaped slide groove (608) and a strip slide groove (609). The through hole plate one (603) and through hole plate two (604) are respectively equipped with slider two (611) and slider one (610). Through hole plate one (603) slides with the J-shaped slide groove (608) through slider two (611), and through hole plate two (604) slides with the strip slide groove (609) through slider one (610).

3. A pelletizing machine for recycling and reproducing waste plastics according to claim 2, characterized in that: The hollow ring platform (601) is equipped with an exhaust port (615) at the top. When the through-hole plate (604) drives the piston (614) to move down, the suction port (616) opens and the exhaust port (615) closes. When the through-hole plate (604) drives the piston (614) to move up, the suction port (616) closes and the exhaust port (615) opens.

4. A granulator for recycling and reproducing waste plastics according to claim 3, characterized in that: A U-shaped rod (622) is slidably installed on the inner wall of the hollow ring platform (601). A side wall hole (623) is opened on the U-shaped rod (622). A top plate (619) is slidably installed on the top of the inner cavity of the hollow ring platform (601). A plate hole (620) is opened on the top plate (619). The U-shaped rod (622) is connected to the top plate (619) through a connecting rod (621). The U-shaped rod (622) is connected to the inner wall of the hollow ring platform (601) through a spring (624).

5. A pelletizing machine for recycling and reproducing waste plastics according to claim 4, characterized in that: The hollow ring platform (601) has an upper limit groove (625) and a lower limit groove (626) respectively on the inner wall of the cavity. The U-shaped rod (622) is installed on the U-shaped rod (622). When the piston (614) drives the U-shaped rod (622) to move down, the telescopic ball head (627) is engaged in the lower limit groove (626). When the piston (614) drives the U-shaped rod (622) to move up, the telescopic ball head (627) is engaged in the upper limit groove (625).

6. A pelletizing machine for recycling and reproducing waste plastics according to claim 1, characterized in that: An inlet (617) is installed on the side wall of the hollow ring platform (601), and a drain (618) is installed at the bottom of the hollow ring platform (601); a drain pipe (605) is installed at the bottom of the through-hole plate (604), and the drain pipe (605) is connected to the through hole on the through-hole plate (604).

7. A pelletizing machine for recycling and reproducing waste plastics according to claim 1, characterized in that: The extruder (4) includes an extrusion tube (401), the bottom of the melting chamber (1) is connected to the extrusion tube (401), and a pusher screw (403) is installed inside the extrusion tube (401). The pusher screw (403) is driven by a motor (402).

Images