Extruder and processing method for processing plastic bags and suitcases by recycling plastic

Abstract

The invention relates to the technical field of plastic recycling, in particular to an extruder for processing plastic bags through plastic recycling and a processing method.The feeding device comprises a mixing tank, a color master conveying device, a color sub conveying device and a recycled particle conveying device, and the color master conveying device, the color sub conveying device and the recycled particle conveying device are used for conveying materials towards the interior of the mixing tank; according to the extruder for recycling and processing the plastic bags and the processing method, before the plastic enters the screw rod, dust removal and sand removal can be performed on mixed particles formed by recycled particles and raw material particles through combination of air blowing and air suction and stirring of the mixed particles; and it is guaranteed that no impurity exists on the outer surface of the machined and formed luggage, and damage of sand grains to the screw rod is also avoided. The sand grains which cannot be sucked out can be collected through the sand falling holes, and the sand grains clamped into the sand falling holes are sucked away through the sand suction mechanism in the pulling-out process, so that the sand grains are prevented from returning to the mixing tank, and further sand grain cleaning is realized.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, specifically to an extruder and processing method for recycling and processing plastic bags. Background Technology

[0002] In the production of plastic bags, injection molding produces a relatively rigid plastic structure, which is currently a popular style on the market. During injection molding, a significant number of sprue marks are generated. These marks are stored in a collection tank, and when a certain quantity is reached, they are sent to a crusher for further processing. The recycled particles are mixed with the raw material particles at a ratio of 20%-30%, and then fed into an extruder via a screw conveyor for heating and fusion. This process saves considerable material and promotes resource reuse.

[0003] However, because plastic sprues are placed in an exposed factory environment with a lot of dust, and because they need to be fed into a crusher and collected from the bottom of the crusher, impurities are introduced during the storage and crushing process. These impurities are mostly dust and sand. When dust mixes into the molten material, it will cause spots, pits, raised impurities, or scratches on the surface of the finished plastic bags. When sand mixes into the molten material, it will cause wear between the screw and the sand particles.

[0004] Therefore, it is necessary to design an extruder and processing method for recycling plastic bags, which can remove dust and sand from recycled particles and raw material particles before they enter the screw, so as to prevent them from being mixed into the molten material. Summary of the Invention

[0005] To address the aforementioned technical shortcomings, the purpose of this invention is to provide an extruder and processing method for recycling and processing plastic bags, which can remove dust and sand from recycled particles and raw material particles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides an extruder and processing method for recycling plastic bags, including an extruder body and a feeding device for feeding materials toward the extruder. The feeding device includes a mixing tank and a masterbatch conveying device, a colorant conveying device, and a recycled particle conveying device for conveying materials toward the interior of the mixing tank. Two dust suction mechanisms are arranged on the lateral sides of the mixing tank. The dust suction mechanisms are used to suction air from the mixed particles. Each dust suction mechanism is provided with an arc-shaped baffle plate, which is fixedly installed inside the mixing tank. A discharge gate mechanism is fixedly installed inside the mixing tank. The discharge gate mechanism includes a thick gate plate for blocking the bottom of the two arc-shaped baffle plates. An exhaust stirring mechanism is fixedly installed on the mixing tank. The exhaust stirring mechanism includes multiple stirring blades for rotating and stirring the mixed particles. The stirring blades are provided with multiple air outlets. Each arc-shaped baffle plate is provided with multiple air suction holes.

[0007] Preferably, the tops of the curved baffle and the thick gate are both curved and coaxially arranged, the thick gate is inserted between the two curved baffles, and there is a gap between the stirring blade and the thick gate and the curved baffle.

[0008] Preferably, each dust collection mechanism includes a suction pipe and a sealing plate installed at the bottom of the arc-shaped baffle plate. The arc-shaped baffle plate and the sealing plate form a slow-air chamber with the inner wall of the mixing tank. The suction pipe is fixedly installed on the mixing tank and connected to the slow-air chamber. The suction pipe is connected to the suction equipment.

[0009] Preferably, the thick gate plate is provided with multiple sand-falling holes.

[0010] Preferably, it also includes a sand suction mechanism for cleaning the sand discharge hole. The sand suction mechanism includes a flat nozzle, two three-way pipes, two horn pipes, an electromagnetic butterfly valve, and two connecting hoses. When the thick gate is completely pulled out, the flat nozzle is facing the end of the sand discharge hole. Each single-sided interface of the three-way pipe is connected to the suction pipe in sequence through the horn pipe, the electromagnetic butterfly valve, and the connecting hose.

[0011] Preferably, it also includes a gate, a synchronous gate closing mechanism, and an elastic push mechanism. The gate is rotatably installed inside the air venting chamber and is used to cover the air outlet end of the intake pipe. The synchronous gate closing mechanism is used to push the gate toward the intake pipe. The elastic push mechanism includes a spring-loaded guide post that can be elastically pushed toward the gate. The spring-loaded guide post is used to push the gate to rotate and open. The synchronous gate closing mechanism is connected to the thick gate. When the thick gate is pushed outward, it drives the synchronous gate closing mechanism to rotate the gate and cover the intake pipe.

[0012] Preferably, the discharge gate mechanism further includes a rack, a gear, a drive motor, and two slide rails. The drive motor is fixedly mounted on the mixing tank via a motor mount. The drive motor is driven by the gear meshing with the rack. The rack is fixedly mounted on the bottom of the thick gate plate. The two slide rails are fixedly mounted on the mixing tank. The end of the thick gate plate is provided with an extension slide block that is slidably connected to the slide rail. The synchronous closing mechanism includes a rotating plate for driving its operation. The rotating plate is rotatably mounted on the slide rail. The slide rail is provided with a clearance groove for the end of the rotating plate to pass through. The extension slide block is used to rotate and push the end of the rotating plate back into the clearance groove.

[0013] Preferably, the synchronous gate closing mechanism further includes a push column and an inclined plate. The push column can be horizontally slidably installed on the side wall of the mixing tank. One end of the rotating plate abuts against one end of the push column, while the other end of the push column abuts against the inclined plate. The inclined plate is fixedly connected to the gate.

[0014] Preferably, the exhaust stirring mechanism further includes a central tube, an air inlet pipe, and a rotary motor for driving the central tube to rotate. The rotary motor is fixedly installed on the outer wall of the mixing tank. The central tube is rotatably installed on the mixing tank. Multiple stirring blades are fixedly connected to the central tube. One end of the air inlet pipe is attached to one end of the central tube and is fixedly installed on the outer wall of the mixing tank. The middle part of the central tube is hollow and connected to the air inlet pipe. Each stirring blade has a longitudinal channel and multiple transverse channels intersecting the longitudinal channel. The air outlet is connected to the transverse channels. The central tube has a connecting air hole connected to the longitudinal channel. Multiple stirring protrusions are provided on the stirring blades.

[0015] An extrusion processing method using an extruder, characterized by comprising the following steps: Step 1: The masterbatch conveying equipment, the dice conveying equipment, and the recycled particle conveying equipment convey particles into the mixing tank in proportion; Step 2: The exhaust stirring mechanism mixes various particles through stirring blades to form mixed particles; Step 3: During the mixing process in Step 2, the exhaust stirring mechanism blows air toward the plastic particles through the air outlet, while the dust suction mechanism sucks air into the mixing tank through the suction pipe. Step 4: After mixing is complete, the discharge gate mechanism controls the thick gate plate to be pulled out of the mixing tank, and the mixed particles fall into the screw conveyor, and are conveyed towards the feed port of the extruder through the screw conveyor. Step 5: In step 4, after the thick gate is pulled outward, the sand suction mechanism is connected to the suction pipe by the suction force. At the same time, as the thick gate is opened, the gate rotates to cover the suction pipe, so that the flat nozzle pipe sucks in the sand particles on the sand drop hole. Step 6: The extruder heats the mixed particles and extrudes them into the mold cavity.

[0016] The beneficial effects of this invention are as follows: The extruder and processing method for processing recycled plastic bags can, before the material enters the screw, combine blowing and suction to agitate the mixed particles, removing dust and sand from the mixture of recycled and raw material particles. This prevents the particles from contaminating the molten material, ensuring a clean outer surface of the finished bag and avoiding damage to the screw from sand particles. Furthermore, the sand drop holes collect sand particles that cannot be sucked out, and during the pulling process, a sand suction mechanism removes sand particles stuck in the drop holes, preventing them from returning to the mixing tank, thus achieving further sand cleaning. Moreover, no additional suction or sand collection equipment is required, and the invention provides strong suction for cleaning sand particles. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a partial front view of the present invention.

[0020] Figure 3 This is a partial cross-sectional view of the present invention.

[0021] Figure 4 This is a partial three-dimensional structural diagram of the present invention.

[0022] Figure 5 This is a schematic diagram of the three-dimensional structure after the thick gate plate is pulled out.

[0023] Figure 6 This is a three-dimensional structural diagram of the thick gate before it is pulled out.

[0024] Figure 7 This is a schematic diagram of the spatial location of the synchronous gate closing mechanism.

[0025] Figure 8 This is a three-dimensional structural diagram of the elastic extrapolation mechanism.

[0026] Figure 9 This is a schematic diagram of the three-dimensional structure of the rotating plate.

[0027] Figure 10 This is a schematic diagram showing the extended slide block in its separated state.

[0028] Figure 11 This is a three-dimensional structural diagram of the exhaust stirring mechanism.

[0029] Figure 12 This is a schematic diagram of half of the stirring blade unfolded.

[0030] Figure 13 This is a partial three-dimensional structural diagram of the central tube.

[0031] Explanation of reference numerals in the attached drawings: 1. Dust collection mechanism; 1a. Arc-shaped baffle plate; 1a1. Suction hole; 1b. Suction pipe; 1c. Enclosed plate; 1d. Air venting chamber; 2. Exhaust and stirring mechanism; 2a. Stirring blade; 2a1. Air outlet; 2a2. Longitudinal channel; 2a3. Transverse channel; 2a4. Stirring protrusion; 2b. Central tube; 2b1. Connecting air hole; 2c. Air inlet pipe; 2d. Rotary motor; 3. Material discharge gate mechanism; 3a. Thick gate plate; 3a1. Sand discharge hole; 3a2. Extension slide; 3b. Rack; 3c. Gear; 3d. Drive motor; 3f, Slide rail; 3f1, Clearance groove; 4, Mixing tank; 4a, Divider plate; 5, Sand suction mechanism; 5a, Flat nozzle pipe; 5b, T-joint pipe; 5c, Horn pipe; 5d, Electromagnetic butterfly valve; 5e, Connecting hose; 5f, Gate plate; 5h, Synchronous gate closing mechanism; 5h1, Turning plate; 5h2, Push column; 5h3, Inclined plate; 5j, Elastic push mechanism; 5j1, Spring; 5j2, Spring-opening guide column; 5j3, Guide seat; 5j4, Retaining ring; 11, Color masterbatch conveying equipment; 12, Dice conveying equipment; 13, Recycled particle conveying equipment; 14, Screw conveyor. Detailed Implementation

[0032] 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.

[0033] Example: This invention provides an extruder and processing method for recycling plastic into plastic bags, such as... Figure 1-13As shown, the extruder includes an extruder body and a feeding device for feeding material into the extruder. The feeding device includes a mixing tank 4 and a masterbatch conveying device 11, a die conveying device 12, and a recycled particle conveying device 13 for conveying material into the mixing tank 4. A screw conveyor 14 is installed at the bottom of the mixing tank 4 to convey the mixed particles into the extruder body. The masterbatch conveying device 11, die conveying device 12, and recycled particle conveying device 13 all have a quantitative conveying function, and the proportion conveyed each time can be controlled as needed. Recycled particles can only account for 20%-30% of a single batch of material. The recycled particles, masterbatch, and die particles are mixed in the mixing tank 4 to form the aforementioned mixed particles. A partition plate 4a is provided on the mixing tank 4 to separate and prevent the various particles from falling off. Two dust collection mechanisms 1 are arranged on both sides of the mixing tank 4. These mechanisms suck up air from the mixed particles, removing dust and sand particles through suction. Each mechanism 1 has an arc-shaped baffle 1a, which is fixedly installed inside the mixing tank 4. A discharge gate mechanism 3 is also fixedly installed inside the mixing tank 4, comprising a thick gate plate 3a for blocking the bottom of the two arc-shaped baffles 1a. An exhaust stirring mechanism 2 is fixedly installed on the mixing tank 4, comprising multiple stirring blades 2a that rotate and stir the mixed particles. Each stirring blade 2a has multiple air outlets 2a1 connected to an air blowing device. By rotating and expelling air simultaneously, the stirring blades 2a blow away dust and sand particles from each particle. The separated particles are then sucked up by the dust collection mechanisms 1. It should be noted that the blown-away dust and sand particles are more easily sucked up by the dust collection mechanisms 1. During the blowing process, the airflow tends to move from the center outwards. Each curved baffle plate 1a is provided with multiple suction holes 1a1. The diameter of the suction holes 1a1 is less than half the diameter of the mixed particles. Dust and sand particles are sucked away through the suction holes 1a1.

[0034] Both the curved baffle plate 1a and the thick gate plate 3a have curved tops and are coaxially arranged. The thick gate plate 3a and the two curved baffle plates 1a divide the mixing tank 4 chambers into upper and lower layers. The thick gate plate 3a is inserted between the two curved baffle plates 1a, and there are gaps between the stirring blade 2a and the thick gate plate 3a and the curved baffle plates 1a. When the thick gate plate 3a is pulled out from between the two curved baffle plates 1a, the mixed particles located above will slide downwards. Furthermore, the curved structure of 1a allows the mixed particles to slide downwards more quickly.

[0035] Each dust collection mechanism 1 includes a suction pipe 1b and a sealing plate 1c installed at the bottom of the arc-shaped baffle plate 1a. The arc-shaped baffle plate 1a and the sealing plate 1c form a slow-air chamber 1d between themselves and the inner wall of the mixing tank 4. The suction pipe 1b is fixedly installed on the mixing tank 4 and connected to the slow-air chamber 1d. The suction pipe 1b is also connected to a suction device. The linear suction force of the suction pipe 1b disperses the dust and sand particles entering the slow-air chamber 1d and distributes them evenly to multiple suction holes 1a1. The dust and sand particles on the mixed particles are then sucked up through the suction holes 1a1.

[0036] The thick gate 3a has multiple sand drop holes 3a1. During mixing, some sand particles fall downwards, and because the mixed particles are relatively smooth, they cannot be pushed into the suction hole 1a1. The sand drop holes 3a1 trap the sand particles, and the depth of the sand drop holes 3a1 is less than one-third of the thickness of the mixed particles. Even after being trapped, they can be pushed out by the pressure against the mixing tank 4. When the thick gate 3a is subsequently pulled out, the trapped sand particles are carried out along with it. It should be noted that larger sand particles are not mixed into the mixed particles; these larger particles are filtered out by a coarse sieve before being placed into the mixing tank 4.

[0037] The sand particles in the sand drop hole 3a1 need to be removed. If the sand particles are not removed, they will re-enter the mixing tank 4 when the thick gate 3a blocks the flow again. Therefore, a sand suction mechanism 5 is also included to clean the sand drop hole 3a1. The sand suction mechanism 5 includes a flat nozzle 5a, two three-way pipes 5b, two horn pipes 5c, a solenoid butterfly valve 5d, and two connecting hoses 5e. When the thick gate 3a is completely pulled out, the flat nozzle 5a is positioned directly at the end of the sand drop hole 3a1, ensuring that the sand drop hole 3a1 can be sucked up by the flat nozzle 5a from the beginning to the end. Each single-sided interface of the three-way pipe 5b is connected to the suction pipe 1b in sequence through the horn pipe 5c, the solenoid butterfly valve 5d, and the connecting hose 5e. When the suction pipe 1b is drawing air into the air-relieving chamber 1d, the solenoid butterfly valve 5d is closed; when the flat nozzle 5a is needed for air intake, the solenoid butterfly valve 5d is opened, allowing the flat nozzle 5a to clean the sand particles in the sand drop hole 3a1. Through this cleaning method, the sucked-in sand particles are automatically collected and enter the filter bag connected to the suction pipe 1b. This structure, in addition to cleaning sand particles, eliminates the need for separate suction and collection devices, thereby reducing costs and space requirements associated with additional equipment.

[0038] The discharge gate mechanism 3 also includes a rack 3b, a gear 3c, a drive motor 3d, and two slide rails 3f. The drive motor 3d is fixedly mounted on the mixing tank 4 via a motor mount. The drive motor 3d is driven by the gear 3c meshing with the rack 3b. The rack 3b is fixedly mounted on the bottom of the thick gate plate 3a. The two slide rails 3f are fixedly mounted on the mixing tank 4. The end of the thick gate plate 3a is provided with an extension slide block 3a2 that is slidably connected to the slide rail 3f. The synchronous closing mechanism 5h includes a rotating plate 5h1 for driving its operation. The rotating plate 5h1 is rotatably mounted on the slide rail 3f. The slide rail 3f has a clearance groove 3f1 for the end of the rotating plate 5h1 to pass through. The extension slide block 3a2 is used to rotate and push the end of the rotating plate 5h1 back into the clearance groove 3f1. The thick gate plate 3a is pulled out of the mixing tank 4 by the drive motor 3d driving the gear 3c. During this process, the extension slide block 3a2 and the slide rails 3f serve to guide the sliding of the thick gate plate 3a. Specifically, the two slide rails 3f are provided with locking strips inward, and the extension slide block 3a2 is provided with a slot for the locking strips to be inserted. Through the interlocking between the two, the thick gate plate 3a can slide horizontally.

[0039] When the extension slide 3a2 moves, it pushes the rotating plate 5h1 to rotate. Once the rotating plate 5h1 is fully retracted into the clearance groove 3f1, the synchronous closing mechanism 5h completes its work. When the rotating plate 5h1 needs to pop out of the clearance groove 3f1, the extension slide 3a2 needs to be reset.

[0040] That is, at the very beginning of the opening of the thick gate 3a, the gate 5f closes, and only when the thick gate 3a is completely closed does the gate 5f open. The closure of the gate 5f means that the flat-nozzle tube 5a can have a strong suction force to draw sand particles from the sand drop hole 3a1, thus ensuring that the strong suction of the flat-nozzle tube 5a to the sand drop hole 3a1 can continue throughout the entire opening and closing process.

[0041] The synchronous gate closing mechanism 5h also includes a pusher 5h2 and an inclined plate 5h3. The pusher 5h2 can be horizontally slidably installed on the side wall of the mixing tank 4. One end of the rotating plate 5h1 abuts against one end of the pusher 5h2, while the other end of the pusher 5h2 abuts against the inclined plate 5h3. The inclined plate 5h3 is fixedly connected to the gate 5f. When the rotating plate 5h1 rotates, it will push the pusher 5h2, which will then push the gate 5f to rotate and close the suction pipe 1b via the inclined plate 5h3.

[0042] The exhaust stirring mechanism 2 also includes a central pipe 2b, an air inlet pipe 2c, and a rotary motor 2d for driving the central pipe 2b to rotate. The rotary motor 2d is fixedly installed on the outer wall of the mixing tank 4. The central pipe 2b is rotatably installed on the mixing tank 4. Multiple stirring blades 2a are fixedly connected to the central pipe 2b. One end of the air inlet pipe 2c is attached to one end of the central pipe 2b, and the air inlet pipe 2c is fixedly installed on the outer wall of the mixing tank 4. The middle part of the central pipe 2b is hollow and connected to the air inlet pipe 2c. Each stirring blade 2a has a longitudinal channel 2a2 and multiple transverse channels 2a3 intersecting with the longitudinal channel 2a2. The air outlet 2a1 is connected to the transverse channels 2a3. The central pipe 2b has a connecting air hole 2b1 connected to the longitudinal channel 2a2. Multiple stirring protrusions 2a4 are provided on the stirring blades 2a. The air inlet pipe 2c is connected to the air blowing device. The airflow enters the longitudinal channel 2a2 along the central pipe 2b, then disperses from the longitudinal channel 2a2 to multiple transverse channels 2a3, and finally exits from the air outlet 2a1. The air inlet pipe 2c is attached to the central pipe 2b but not fixedly connected to it, so as to prevent the rotation of the central pipe 2b from causing the rotation of the air inlet pipe 2c. The stirring protrusion 2a4 can provide more contact area with the mixed particles when the stirring blade 2a is agitated.

[0043] The extrusion process using an extruder includes the following steps: Step 1: The masterbatch conveying device 11, the dice conveying device 12, and the recycled particle conveying device 13 convey particles into the mixing tank 4 in proportion; Step 2: The exhaust stirring mechanism 2 mixes various particles through the stirring blades 2a to form mixed particles; Step 3: During the mixing process in Step 2, the exhaust stirring mechanism 2 blows air toward the plastic particles through the air outlet 2a1, while the dust suction mechanism 1 sucks air into the mixing tank 4 through the suction pipe 1b. Step 4: After mixing is complete, the discharge gate mechanism 3 controls the thick gate plate 3a to be pulled out from the mixing tank 4, and the mixed particles fall into the screw conveyor 14, and are conveyed towards the feed port of the extruder through the screw conveyor 14. Step 5: In step 4, after the thick gate 3a is pulled outward, the sand suction mechanism 5 is connected to the suction pipe 1b by suction. At the same time, as the thick gate 3a is opened, the gate 5f rotates to cover the suction pipe 1b, so that the flat nozzle 5a sucks in the sand particles on the sand drop hole 3a1. Step 6: The extruder heats the mixed particles and extrudes them into the mold cavity.

[0044] This extruder and processing method for recycling plastic bags utilizes a combination of blowing and suction to agitate the mixed particles before they enter the screw. This process removes dust and sand from the mixture of recycled and raw material particles, preventing them from contaminating the molten material and ensuring a clean outer surface for the finished bags. It also prevents sand from damaging the screw. Furthermore, sand particles that cannot be sucked out are collected through the sand discharge hole 3a1. During the extrusion process, the sand suction mechanism 5 removes any sand particles stuck in the sand discharge hole 3a1, preventing them from returning to the mixing tank 4 and achieving further sand cleaning. This method eliminates the need for additional suction or sand collection equipment and provides strong suction for effective sand cleaning.

[0045] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An extruder for recycling and processing plastic bags, characterized in that, The extruder body and a feeding device for feeding material toward the extruder are included. The feeding device includes a mixing tank (4) and a masterbatch conveying device (11), a colorant conveying device (12), and a recycled particle conveying device (13) for conveying material toward the interior of the mixing tank (4). Two dust suction mechanisms (1) are provided on the lateral sides of the mixing tank (4). The dust suction mechanisms (1) are used to suction air from the mixed particles. Each dust suction mechanism (1) is provided with an arc baffle plate (1a). The arc baffle plate (1a) is fixedly installed on the mixing tank. Inside the tank (4), the material discharge gate mechanism (3) is fixedly installed inside the mixing tank (4). The material discharge gate mechanism (3) includes a thick gate plate (3a) for blocking the bottom of the two arc baffle plates (1a). The exhaust stirring mechanism (2) is fixedly installed on the mixing tank (4). The exhaust stirring mechanism (2) includes multiple stirring blades (2a) for rotating and stirring the mixed particles. The stirring blades (2a) are provided with multiple air outlets (2a1). Each arc baffle plate (1a) is provided with multiple air intake holes (1a1).

2. The extruder for processing recycled plastic bags as described in claim 1, characterized in that, The tops of the curved baffle (1a) and the thick gate (3a) are both curved and coaxially arranged. The thick gate (3a) is inserted between the two curved baffles (1a). There is a gap between the stirring blade (2a) and the thick gate (3a) and the curved baffle (1a).

3. The extruder for processing recycled plastic bags as described in claim 1, characterized in that, Each vacuuming mechanism (1) includes a suction pipe (1b) and a sealing plate (1c) installed at the bottom of the arc baffle (1a). The arc baffle (1a) and the sealing plate (1c) form a slow-air chamber (1d) between the arc baffle (1a) and the inner wall of the mixing tank (4). The suction pipe (1b) is fixedly installed on the mixing tank (4) and connected to the slow-air chamber (1d). The suction pipe (1b) is connected to the suction equipment.

4. The extruder for processing recycled plastic bags as described in claim 3, characterized in that, Multiple sand-falling holes (3a1) are provided on the thick gate plate (3a).

5. The extruder for processing recycled plastic bags as described in claim 4, characterized in that, in, It also includes a sand suction mechanism (5) for cleaning the sand drop hole (3a1). The sand suction mechanism (5) includes a flat nozzle (5a), two three-way pipes (5b), two bell pipes (5c), an electromagnetic butterfly valve (5d), and two connecting hoses (5e). When the thick gate (3a) is completely pulled out, the flat nozzle (5a) is facing the end of the sand drop hole (3a1). Each single-sided interface of the three-way pipe (5b) is connected to the suction pipe (1b) in sequence through the bell pipe (5c), the electromagnetic butterfly valve (5d), and the connecting hose (5e).

6. The extruder for processing recycled plastic bags as described in claim 5, characterized in that, It also includes a gate (5f), a synchronous gate closing mechanism (5h), and an elastic push mechanism (5j). The gate (5f) is rotatably installed inside the air venting chamber (1d) and is used to cover the air outlet of the intake pipe (1b). The synchronous gate closing mechanism (5h) is used to push the gate (5f) toward the intake pipe (1b). The elastic push mechanism (5j) includes a spring-loaded guide post (5j2) that can be elastically pushed toward the gate (5f). The spring-loaded guide post (5j2) is used to push the gate (5f) to rotate and open. The synchronous gate closing mechanism (5h) is connected to the thick gate (3a) in a transmission manner. When the thick gate (3a) is pushed outward, it drives the synchronous gate closing mechanism (5h) to drive the gate (5f) to rotate and cover the intake pipe (1b).

7. The extruder for processing recycled plastic bags as described in claim 6, characterized in that, The material discharge gate mechanism (3) also includes a rack (3b), a gear (3c), a drive motor (3d), and two slide rails (3f). The drive motor (3d) is fixedly installed on the mixing tank (4) through a motor mount. The drive motor (3d) is driven by meshing with the rack (3b) through the gear (3c). The rack (3b) is fixedly installed on the bottom of the thick gate plate (3a). The two slide rails (3f) are fixedly installed on the mixing tank (4). The end of the thick gate plate (3a) is provided with an extension slide (3a2) that is slidably connected to the slide rail (3f). The synchronous closing mechanism (5h) includes a rotating plate (5h1) for driving its operation. The rotating plate (5h1) is rotatably installed on the slide rail (3f). The slide rail (3f) is provided with a clearance groove (3f1) for the end of the rotating plate (5h1) to pass through. The extension slide (3a2) is used to rotate and push the end of the rotating plate (5h1) back into the clearance groove (3f1).

8. The extruder for processing recycled plastic bags as described in claim 7, characterized in that, The synchronous gate closing mechanism (5h) also includes a push column (5h2) and an inclined plate (5h3). The push column (5h2) can be horizontally slidably installed on the side wall of the mixing tank (4). One end of the rotating plate (5h1) abuts against one end of the push column (5h2), while the other end of the push column (5h2) abuts against the inclined plate (5h3). The inclined plate (5h3) is fixedly connected to the gate (5f).

9. An extruder for processing recycled plastic bags as described in claim 1 or 8, characterized in that, The exhaust stirring mechanism (2) also includes a central tube (2b), an air inlet pipe (2c), and a rotary motor (2d) for driving the central tube (2b) to rotate. The rotary motor (2d) is fixedly installed on the outer wall of the mixing tank (4). The central tube (2b) is rotatably installed on the mixing tank (4). Multiple stirring blades (2a) are fixedly connected to the central tube (2b). One end of the air inlet pipe (2c) is attached to one end of the central tube (2b), and the air inlet pipe (2c) is fixedly installed on the mixing tank (4). The outer wall of the central tube (2b) is hollow in the middle and connected to the air inlet tube (2c). Each stirring blade (2a) has a longitudinal channel (2a2) and multiple transverse channels (2a3) intersecting with the longitudinal channel (2a2). The air outlet (2a1) is connected to the transverse channel (2a3). The central tube (2b) has a connecting air hole (2b1) connected to the longitudinal channel (2a2). Multiple stirring protrusions (2a4) are provided on the stirring blade (2a).

10. A processing method based on the extruder of claim 8, characterized in that, Includes the following steps: Step 1: The masterbatch conveying device (11), the dice conveying device (12), and the recycled particle conveying device (13) convey particles into the mixing tank (4) in proportion; Step 2: The exhaust stirring mechanism (2) mixes various particles through the stirring blades (2a) to form mixed particles; Step 3: During the mixing process in Step 2, the exhaust stirring mechanism (2) blows air toward the plastic particles through the air outlet (2a1), while the dust suction mechanism (1) sucks air into the mixing tank (4) through the suction pipe (1b). Step 4: After mixing is completed, the discharge gate mechanism (3) controls the thick gate plate (3a) to be pulled out from the mixing tank (4), and the mixed particles fall into the screw conveyor (14), and are conveyed towards the feed port of the extruder through the screw conveyor (14). Step 5: In step 4, after the thick gate (3a) is pulled outward, the sand suction mechanism (5) is connected to the suction pipe (1b) by suction. At the same time, as the thick gate (3a) is opened, the gate (5f) rotates and covers the suction pipe (1b), so that the flat nozzle (5a) sucks in the sand particles on the sand drop hole (3a1). Step 6: The extruder heats the mixed particles and extrudes them into the mold cavity.

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