Anti-blocking machine head of single-screw extruder for waste plastic recovery

Abstract

The invention discloses a single-screw extruder anti-blocking machine head for waste plastic recovery, and relates to the technical field of single-screw extruders, the single-screw extruder anti-blocking machine head comprises a rack and a mold, the top end of the rack is fixedly connected with a supporting column, the top end of the supporting column is fixedly connected with a third heater, one end of the third heater is fixedly connected with a cleaning mechanism, and the other end of the third heater is fixedly connected with the mold. One end of the cleaning mechanism is fixedly connected with a correcting mechanism, the cleaning mechanism is arranged, after fiber impurities corrected by the correcting mechanism in the flowing posture pass through the first pipeline, under continuous rotation of the scraping shell, the scraping shell hooks the fiber impurities in the plastic melt and brings the fiber impurities out of the plastic melt, and then the fiber impurities in the plastic melt are cleaned; therefore, the fiber impurities in the plastic melt are cleaned, and the blockage of the machine head caused by the fiber impurities is prevented; and fiber impurities on the surface of the scraping shell can be removed during rotation of the scraping shell, and the situation that the fiber impurities are accumulated on the surface of the scraping shell, and normal cleaning of impurities in plastic melt by the scraping shell is affected is prevented.

Description

Technical Field

[0001] This invention relates to the field of single-screw extruder technology, and in particular to an anti-clogging die head for a single-screw extruder used for waste plastic recycling. Background Technology

[0002] Single-screw extruders are a common type of extrusion equipment used in the plastics processing industry. They are primarily used for extruding thermoplastics such as soft and rigid polyvinyl chloride (PVC) and polyethylene (PE), and can process a variety of plastic products, such as blown films, extruded pipes, pressed sheets, and drawn ribbons. They can also be used for melt granulation. A single-screw extruder mainly consists of a barrel, a screw, and a die head; the screw and barrel work together to extrude the molten material through the die head to form the final shape.

[0003] Single-screw extruders are also used in the recycling of waste plastics. Because waste plastics contain rigid, non-meltable impurities (metals, glass, sand, etc.) and fibrous impurities (cotton / chemical fibers, glass fibers, etc.), although waste plastics need to be cleaned during melting, due to the need for repeated handling and the large quantity of waste plastics, a small amount of impurities still remain during actual melting. When impurities enter the die head with the plastic melt, the accumulation of rigid, non-meltable impurities and fibrous impurities in the die head outlet mold can easily cause blockage in the die head, thus affecting the normal operation of the single-screw extruder. Currently, most methods for filtering impurities in molten plastics use filter plates. While filter plates are effective at filtering rigid, non-meltable impurities, they have significant limitations when filtering fibrous impurities. When the fiber length exceeds the filter pore diameter, its ends are easily caught by different pores, creating a "bridging" effect. This leads to a dense network layer forming on the filter surface, causing blockage of the flow channel. Furthermore, if the fibrous impurities flow axially parallel in the flow field, they can easily penetrate the filter pores and reach the die head outlet. Fiber impurities that penetrate or are not intercepted accumulate inside the die head, causing blockages that not only interrupt normal production but also result in quality defects in the molded parts. Therefore, this paper proposes an anti-clogging die head for single-screw extruders used in waste plastic recycling to address these issues. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-clogging die head for a single-screw extruder used for waste plastic recycling, in order to solve the problems in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A single-screw extruder anti-clogging die head for waste plastic recycling includes a frame and a die. A support column is fixedly connected to the top of the frame, and a third heater is fixedly connected to the top of the support column. A cleaning mechanism is fixedly connected to one end of the third heater, and a correction mechanism is fixedly connected to one end of the cleaning mechanism. There are at least two correction mechanisms, and adjacent correction mechanisms are fixedly connected by flanges. One end of one correction mechanism is fixedly connected to a connecting pipe, which is fixedly connected to the barrel of the single-screw extruder. A transition pipe is fixedly connected to one end of the cleaning mechanism, and a fourth pipe is fixedly connected to the bottom end of the transition pipe. A filter mechanism is fixedly connected to the other end of the fourth pipe, and the die is fixedly connected to the other end of the filter mechanism.

[0006] Preferably, a cover plate is fixedly connected to one end of the transition tube, a second motor is fixedly connected to one end of the cover plate, a spiral conveying rod is fixedly connected to the end of the main shaft of the second motor, and a fourth heater is fixedly connected to the outside of the transition tube.

[0007] Preferably, the correction mechanism includes a correction tube, a contraction tube, and an expansion tube. The contraction tube and the expansion tube are respectively fixed at both ends of the correction tube, and the expansion tube of the adjacent correction mechanism is fixedly connected to the contraction tube. The contraction tube at the head is fixedly connected to the connecting tube, and the expansion tube at the tail is fixedly connected to the cleaning mechanism. A first heater is fixedly connected to the outside of the correction tube.

[0008] Preferably, the angle between the generatrix of the inner wall of the contraction tube and the central axis of the correction tube is the contraction angle B, where B is 8°-12°, and the angle between the generatrix of the inner wall of the expansion tube and the central axis of the correction tube is the expansion angle A, where A is 4°-8°.

[0009] Preferably, a guide plate is fixedly connected to the inner side of the correction tube, a fixing rod is fixedly connected to the end of the correction tube, and a guide column is fixedly connected to one end of the fixing rod.

[0010] Preferably, the cleaning mechanism includes a first pipe fixedly connected to the expansion tube at the tail end, a guide cylinder fixedly connected to the top end of the first pipe, a second heater fixedly connected to the outer side of the guide cylinder, end caps fixedly connected to both ends of the guide cylinder, a first motor fixedly connected to one end of one end cap, a rotating roller fixedly connected to the end of the main shaft of the first motor, guide rods fixedly connected to all four sides of the rotating roller, a scraper shell slidably connected to the outer side of the guide rod, the scraper shell including a guide portion, a first spring fixedly connected to one end of the guide rod, and the other end of the first spring fixedly connected to the scraper shell.

[0011] Preferably, a guide plate is fixedly connected to the end of the scraper, and the guide plate is slidably connected to the guide rod.

[0012] Preferably, a collection box is fixedly connected to one end of the guide cylinder, a conveying plate is slidably connected to the inner side of the collection box, a first scraping point is provided at the end of the conveying plate, side plates are fixedly connected to both ends of the conveying plate, a second scraping point is provided on the side plate near the first scraping point, a fixing block is fixedly connected to one end of the conveying plate, and a second spring fixedly connected to the collection box is fixedly connected to one end of the fixing block.

[0013] Preferably, the filtration mechanism includes a second pipe fixedly connected to the fourth pipe, a filter cylinder fixedly connected to the inner side of the second pipe, a filter ring fixedly connected to the bottom end of the second pipe, a third pipe fixedly connected to the bottom end of the filter ring, and the third pipe fixedly connected to the mold. Bearings and shaft seals are fixedly connected to the outer sides of both the second and third pipes. A collection pipe is fixedly connected to the outer ring of the bearing and the moving ring of the shaft seal. A discharge port is opened on the inner side of the second pipe located in the collection pipe. A discharge port is opened at the bottom end of the collection pipe. A retaining ring is fixedly connected to the bottom end of the collection pipe.

[0014] Preferably, a toothed ring is fixedly connected to the outer side of the collecting pipe, a support plate is fixedly connected to one end of the second pipe, a third motor is fixedly connected to one end of the support plate, and a gear is fixedly connected to the end of the main shaft of the third motor, and the gear meshes with the toothed ring.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. A single-screw extruder anti-clogging die head for waste plastic recycling, equipped with a correction mechanism. The correction mechanism applies directional stretching and guiding action to fibrous impurities in the plastic melt through flow channel structure design (such as shrink-expansion flow channel, built-in flow guiding component), forcing the fibrous impurities to adjust their posture and finally keep parallel to the axis of the correction tube, thereby facilitating the subsequent cleaning mechanism to separate and remove them from the melt.

[0016] 2. A single-screw extruder anti-clogging die head for waste plastic recycling is equipped with a cleaning mechanism. When fiber impurities, after being oriented by the correction mechanism, flow through the first pipe, they are effectively captured by the continuously rotating scraper and removed from the melt, thereby preventing fiber impurities from clogging the die head. In addition, the scraper can automatically complete surface cleaning during rotation, avoiding fiber accumulation and ensuring continuous and stable cleaning efficiency.

[0017] 3. A single-screw extruder anti-clogging die head for waste plastic recycling is equipped with a filtration mechanism. The filtration can filter rigid non-melting impurities in the plastic melt, preventing them from clogging the die head. Furthermore, the rapid rotation of the collection pipe causes the rigid non-melting impurities to move away from the filter ring, preventing them from clogging the filter ring and ensuring the stable operation of the filter ring. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the overall structure of an anti-clogging die head for a single-screw extruder used for waste plastic recycling according to the present invention.

[0020] Figure 2 This is a schematic diagram of the installation structure of the connecting pipe for the anti-clogging die head of a single screw extruder used for waste plastic recycling, according to the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of a correction mechanism for an anti-clogging die head of a single-screw extruder used for waste plastic recycling, according to the present invention.

[0022] Figure 4 This is a schematic diagram of the internal structure of a correction mechanism for an anti-clogging die head of a single-screw extruder used for waste plastic recycling, according to the present invention.

[0023] Figure 5 This is a cross-sectional view of an anti-clogging die head for a single-screw extruder used for waste plastic recycling according to the present invention.

[0024] Figure 6 This is a schematic diagram of the cleaning mechanism for an anti-clogging die head of a single-screw extruder used for waste plastic recycling, according to the present invention.

[0025] Figure 7 This is a schematic diagram of the installation structure of the scraper shell of a single-screw extruder anti-clogging die head for waste plastic recycling according to the present invention.

[0026] Figure 8 This is a side view of the installation structure of the scraper shell of a single-screw extruder for waste plastic recycling, according to the present invention.

[0027] Figure 9 This invention relates to an anti-clogging die head for a single-screw extruder used in waste plastic recycling. Figure 8 A schematic diagram of the structure at point A.

[0028] Figure 10 This is a schematic diagram of the installation structure of the feed plate of the anti-clogging die head of a single screw extruder for waste plastic recycling according to the present invention.

[0029] Figure 11This is a schematic diagram of the installation structure of the first spring in the anti-clogging die head of a single-screw extruder for waste plastic recycling, according to the present invention.

[0030] Figure 12 This is a schematic diagram of the installation structure of the second spring in the anti-clogging die head of a single-screw extruder for waste plastic recycling, according to the present invention.

[0031] Figure 13 This is a schematic diagram of the filter mechanism of a single-screw extruder anti-clogging die head for waste plastic recycling according to the present invention.

[0032] Figure 14 This is a cross-sectional view of a filtration mechanism for an anti-clogging die head of a single-screw extruder used for waste plastic recycling, according to the present invention.

[0033] Figure 15 This is a schematic diagram of the installation structure of a filter ring for an anti-clogging die head of a single-screw extruder used for waste plastic recycling, according to the present invention.

[0034] Figure 16 This is a schematic diagram of the installation structure of the feed port of a single-screw extruder anti-clogging die head for waste plastic recycling according to the present invention.

[0035] Figure 17 This is a schematic diagram of the installation structure of the screw conveyor rod of a single-screw extruder anti-clogging die head for waste plastic recycling, according to the present invention.

[0036] In the diagram: 1. Correction mechanism; 101. Correction tube; 102. Contraction tube; 103. Expansion tube; 104. Guide plate; 105. Fixing rod; 106. Guide column; 2. Cleaning mechanism; 201. First pipe; 202. Guide cylinder; 203. End cap; 204. First motor; 205. Rotary roller; 206. Guide rod; 207. First spring; 208. Scraper; 20801. Guide section; 209. Guide plate; 210. Conveying plate; 21001. First scraping section; 211. Side plate; 21101. Second scraping section; 212. Second spring; 213. Fixing block; 214. Collection box; 3. Filtration mechanism; 301. Second pipe; 30101. Discharge port; 302. Filter ring; 303. Filter cylinder; 304. Collection pipe; 30401. Discharge port; 305. Bearing; 306. Shaft seal; 307. Retaining ring; 308. Gear; 309. Gear ring; 310. Third pipe; 311. Support plate; 312. Third motor; 4. Frame; 5. Connecting pipe; 6. First heater; 7. Second heater; 8. Third heater; 9. Support column; 10. Fourth pipe; 11. Mold; 12. Fourth heater; 13. Transition pipe; 14. Cover plate; 15. Second motor; 16. Screw conveyor. Detailed Implementation

[0037] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. At the same time, all precision instruments such as lead screws, screws, gears, racks, etc. are provided with protective structures such as protective covers. As these are common knowledge, they are not described in detail in the specification. It is understandable for those skilled in the art that some common structures and their descriptions may be omitted in the drawings. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To make the technical means, creative features, objectives, and effects of this invention easier to understand, it should be noted in the description of this invention that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The invention will be further described below in conjunction with specific embodiments.

[0039] Example like Figures 1-17 As shown, a single-screw extruder anti-clogging die head for waste plastic recycling includes a frame 4 and a mold 11. A support column 9 is fixedly connected to the top of the frame 4, and a third heater 8 is fixedly connected to the top of the support column 9. A cleaning mechanism 2 is fixedly connected to one end of the third heater 8, and a correction mechanism 1 is fixedly connected to one end of the cleaning mechanism 2. There are at least two correction mechanisms 1, and adjacent correction mechanisms 1 are fixedly connected by flanges. One end of one correction mechanism 1 is fixedly connected to a connecting pipe 5. If only one correction mechanism 1 is set, the posture correction of fiber impurities will be insufficient. The operator can make corresponding adjustments based on experimental tests to ensure that the correction effect of fiber impurities meets the correction requirements. The connecting pipe 5 is fixedly connected to the barrel of the single screw extruder. The plastic melt enters the inner side of the connecting pipe 5 through the barrel of the single screw extruder, and then enters the inner side of the correction mechanism 1 through the connecting pipe 5. One end of the cleaning mechanism 2 is fixedly connected to a transition pipe 13, and the bottom end of the transition pipe 13 is fixedly connected to a fourth pipe 10. The transition pipe 13 and the fourth pipe 10 are used to transfer the plastic melt after the fiber impurities have been cleaned. The other end of the fourth pipe 10 is fixedly connected to a filter mechanism 3, and the other end of the filter mechanism 3 is fixedly connected to a mold 11. The mold 11 is used for forming the workpiece.

[0040] As a further improvement to the present invention, such as Figure 2 and Figure 17 As shown, a cover plate 14 is fixedly connected to one end of the transition pipe 13, and a second motor 15 is fixedly connected to one end of the cover plate 14. A spiral conveying rod 16 is fixedly connected to the end of the main shaft of the second motor 15, and one end of the spiral conveying rod 16 extends into the inner side of the first pipe 201. At the same time, the end of the spiral conveying rod 16 does not touch the scraper shell 208. A fourth heater 12 is fixedly connected to the outer side of the transition pipe 13. The fourth heater 12 can maintain the temperature inside the transition pipe 13 in real time (matching the plasticizing temperature requirements of the plastic melt), avoiding the sudden increase in viscosity and flow obstruction of the melt due to temperature drop, and ensuring that the plastic melt can smoothly pass through the transition pipe 13 and enter the fourth pipe 10. When the second motor 15 drives the spiral conveyor 16 to rotate, it can form a directional pushing force on the plastic melt that has completed the removal of fiber impurities in the cleaning mechanism 2, and accelerate the melt to be transported to the mold 11 through the fourth pipe 10 and the filter mechanism 3. At the same time, the continuous rotation of the spiral conveyor 16 can provide a stable pushing pressure for the plastic melt, avoid pressure fluctuations at the discharge end of the mold 11, and thus ensure the density uniformity and appearance integrity of the molded workpiece.

[0041] As a further improvement to the present invention, such as Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the correction mechanism 1 includes a correction tube 101, a contraction tube 102, and an expansion tube 103. The contraction tube 102 and the expansion tube 103 are respectively fixed at both ends of the correction tube 101, and the expansion tube 103 of the adjacent correction mechanism 1 is fixedly connected to the contraction tube 102. The contraction tube 102 at the head is fixedly connected to the connecting tube 5, and the expansion tube 103 at the tail is fixedly connected to the cleaning mechanism 2. A first heater 6 is fixedly connected to the outside of the correction tube 101. The first heater 6 can maintain a stable temperature inside the correction tube 101 in real time (matching the plasticizing temperature range of the plastic melt): on the one hand, it can prevent the plastic melt from becoming more viscous and obstructing its flow due to a drop in temperature, ensuring that the plastic melt can smoothly pass through the correction tube 101 and enter the subsequent cleaning mechanism 2; on the other hand, a stable temperature can keep the plastic melt in a low viscosity state, reduce the movement resistance of fiber impurities in the melt, and make it easier for fiber impurities to achieve axial orientation under the tensile force applied by the flow channel structure (such as the shrink tube 102 and the guide plate 104) in the correction tube, laying the attitude foundation for the subsequent cleaning mechanism 2 to accurately remove fiber impurities.

[0042] The molten plastic inside the connecting pipe 5 first passes through the contraction pipe 102 and the correction pipe 101. The interaction between the contraction pipe 102 and the correction pipe 101 generates a directional tensile force on the molten plastic. Meanwhile, the expansion pipe 103 can buffer pressure and stabilize the flow field. The design of multiple consecutive contraction pipes 102, correction pipes 101, and expansion pipes 103 can achieve "multiple stretching-attitude correction", specifically: Fiber impurities in plastic melt are easily affected by tensile force to achieve "straight orientation". A single shrink tube 102 can stretch fibers that deviate from the axial direction (such as those at an angle of 30°-60° to the axial direction) to be close to the axial direction (deviation ≤15°). Fiber impurities can be further "iteratively corrected" by continuously passing through multiple shrink tubes 102, correction tubes 101 and expansion tubes 103, ultimately increasing the proportion of axial orientation of fiber impurities from the initial 60%-70% to more than 90%, laying the foundation for removal by the subsequent cleaning mechanism. Individual shrink tubes 102 and correction tubes 101 are prone to "overstretching" at the end, resulting in uneven melt flow rate; while the continuous structure of "shrinkage-expansion-re-shrinkage-expansion" can release local pressure through expansion tubes 103, avoid the plastic melt from generating eddies due to sudden pressure rise, and reduce the risk of fiber impurities deviating from the axis again.

[0043] As a further improvement to the present invention, such as Figure 5 As shown, the angle between the generatrix of the inner wall of the shrink tube 102 and the central axis of the correction tube 101 is the shrinkage angle B. The shrinkage angle of a single shrink tube 102 is controlled between 8° and 12° (avoid >15°), and multiple shrink tubes 102 maintain the same shrinkage angle B. If the shrinkage angle B is too small (<8°), the tensile force is insufficient and the fiber impurity posture correction efficiency is low. If the shrinkage angle is too large (>15°), the flow velocity of the plastic melt in the shrink tube 102 increases sharply, which easily forms a "shear vortex" near the correction tube 101, causing the fiber impurities to deviate from the axial direction again. The angle between the inner wall generatrix of the expansion tube 103 and the central axis of the correction tube 101 is the expansion angle A, which is 4°-8°. The expansion angle A is 1 / 2-2 / 3 of the contraction angle B (i.e., 4°-8°), and the inner diameter of the end of the expansion tube 103 is consistent with the starting inner diameter of the contraction tube 102. The expansion angle A must be smaller than the contraction angle B to avoid the melt from "backflow eddy" due to excessive expansion. Consistent inner diameters can reduce abrupt changes in the flow channel cross-section, ensure a smooth transition of the plastic melt, and prevent fiber impurities from "getting stuck and veer" at the abrupt change in cross-section.

[0044] Meanwhile, the total length L1 of the shrink tube 102 and the correction tube 101 is greater than the length L2 of the expansion tube 103, with L1:L2=2:1-3:1. The total length of the shrink tube 102 and the correction tube 101 must be long enough to ensure that the fiber impurities have sufficient time to be stretched and oriented. The expansion tube 103 is short and flat, and is only used to buffer the pressure to prevent the fiber impurities from "bounce back and yaw" in the expansion tube 103 due to the disappearance of the stretching force.

[0045] As a further improvement to the present invention, such as Figure 4 and Figure 5 As shown, a guide plate 104 is fixedly connected to the inner side of the correction tube 101. There are 3-4 guide plates 104, which are evenly distributed circumferentially on the inner side of the correction tube 101. The length is the same as that of the correction tube 101. Their function is to "divide" the flow channel, divide the wide flow field into multiple small flow channels, avoid the melt from "lateral flow" in the contraction section, and force the fiber impurities to be oriented along the axial direction. A fixing rod 105 is fixedly connected to the end of the correction tube 101. A guide column 106 is fixedly connected to one end of the fixing rod 105. Its function is to stabilize the flow field in the central region, prevent the plastic melt from forming a "rotating flow" in the center of the pipe, and ensure that the fiber impurities are "axially oriented across the entire cross section" from the center of the correction tube 101 to the pipe wall.

[0046] As a further improvement to the present invention, such as Figure 2 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the cleaning mechanism 2 includes a first pipe 201 fixedly connected to the expansion tube 103 at the tail end. A guide tube 202 is fixedly connected to the top end of the first pipe 201. A through groove communicating with the guide tube 202 is opened at the top end of the first pipe 201, so that the scraper shell 208 can extend into the inside of the first pipe 201 to clean fiber impurities. A second heater 7 is fixedly connected to the outside of the guide cylinder 202, and a third heater 8 is also fixedly connected to the bottom of the guide cylinder 202. The first pipe 201 and the guide cylinder 202 can be heated simultaneously through the second heater 7 and the third heater 8 to ensure the viscosity of the plastic melt and to ensure that fiber impurities are more easily removed by the scraper 208 in the low viscosity plastic melt.

[0047] Both ends of the guide cylinder 202 are fixedly connected to end caps 203. One end of one end cap 203 is fixedly connected to a first motor 204. The end of the main shaft of the first motor 204 is fixedly connected to a rotating roller 205. Guide rods 206 are fixedly connected around the rotating roller 205. A scraper shell 208 is slidably connected to the outside of the guide rods 206. The scraper shell 208 includes a guide part 20801. Both the guide rods 206 and the scraper shell 208 are arc-shaped to ensure that after the scraper shell 208 hooks the fiber impurities, the fiber impurities are not easy to fall off the top of the scraper shell 208. In addition, there are multiple guide rods 206 and scraper shells 208, which are evenly distributed around the rotating roller 205 to ensure the effect of cleaning fiber impurities. One end of the guide rod 206 is fixedly connected to a first spring 207, and the other end of the first spring 207 is fixedly connected to the scraper shell 208. The first spring 207 gives the scraper shell 208 a thrust, thereby ensuring that the scraper shell 208 can extend into the inside of the first pipe 201.

[0048] When the molten plastic enters the inner side of the first pipe 201, the first motor 204 will also rotate clockwise (viewed from right to left) through the rotating roller 205, carrying the guide rod 206 and the scraper 208. During the rotation of the scraper 208 inside the first pipe 201, the arc-shaped hooking surface of the scraper 208 will capture the axial fiber impurities flowing through it. With the rotation, the impurities will be peeled off from the molten plastic and carried out of the first pipe 201 along with the guide rod 206, thereby cleaning the fiber impurities in the molten plastic and reducing the probability of fiber impurities clogging the machine head. When the scraper 208 and the guide rod 206 enter the guide cylinder 202 from the first pipe 201, the scraper 208 will retract under the pressure (compressing the matching first spring 207) to adapt to the spatial connection of the two parts and ensure smooth and uninterrupted rotation.

[0049] As a further improvement to the present invention, such as Figure 9 and Figure 11 As shown, a guide plate 209 is fixedly connected to the end of the scraper 208, and the guide plate 209 is slidably connected to the guide rod 206. The guide plate 209 facilitates the scraper 208 to move to the first scraping point 21001 of the conveying plate 210, preventing the scraper 208 from getting stuck between the first scraping point 21001 and the first scraping point 21001.

[0050] As a further improvement to the present invention, such as Figure 2 , Figure 7 , Figure 10 , Figure 11 and Figure 12As shown, a collection box 214 is fixedly connected to one end of the guide cylinder 202. A sealing cover can be set on the top of the collection box 214. When the collection box 214 collects fiber impurities, the sealing cover can be used to cover the collection box 214 to prevent the impurities from being contaminated by the outside during the collection process. At the same time, it prevents the leakage of volatile plastic melt inside the collection box 214. A heating plate can be installed on the inside of the sealing cover. The heating plate can maintain the temperature inside the collection box 214 (matching the heat preservation requirements of the plastic melt). This prevents the small amount of plastic melt adhering to the surface of the fiber impurities from solidifying and caking due to the temperature drop. This not only prevents the solidified melt from sticking the fiber impurities to the inner wall of the collection box 214, but also makes the subsequent sorting, cleaning and other processing operations of the fiber impurities more convenient. A conveying plate 210 is slidably connected to the inner side of the collection box 214. A first scraping point 21001 is provided at the end of the conveying plate 210. Side plates 211 are fixedly connected to both ends of the conveying plate 210. A second scraping point 21101 is provided on the side plate 211 near the first scraping point 21001. A fixing block 213 is fixedly connected to one end of the conveying plate 210. A second spring 212, which is fixedly connected to the collection box 214, is fixedly connected to one end of the fixing block 213. When the scraper shell 208, carrying fibrous impurities, rotates to the end position of the conveyor plate 210 and the side plate 211, the front and side surfaces of the scraper shell 208 with impurities attached will be in close contact with the first scraping point 21001 of the conveyor plate 210 and the second scraping point 21101 of the side plate 211, respectively. As the scraper shell 208 continues to rotate around the central axis of the roller 205, its surface will form a continuous relative sliding with the first scraping point 21001 and the second scraping point 21101. The first scraping point 21001 mainly peels off the fibrous impurities and attached melt from the front surface of the scraper shell, while the second scraping point 21101 specifically removes the impurities remaining on the side surface of the scraper shell. The dual scraping action can completely peel off the fibrous impurities and a small amount of plastic melt from the surface of the scraper shell 208 and make them fall onto the bearing surface of the conveyor plate 210, thus preparing the scraper shell 208 for the next cycle of impurity grabbing. Furthermore, when the scraper 208 rotates, it will squeeze the conveyor plate 210, causing the conveyor plate 210 to slide along the connecting slide of the guide cylinder 202 and the collection box 214 towards the inside of the collection box 214. This sliding design not only avoids the conveyor plate 210 from obstructing the rotation trajectory of the scraper 208 and ensures the normal rotation of the scraper 208, but also ensures that the cleaning effect of the first scraping point 21001 on the surface of the scraper 208 is uninterrupted through the continuous contact between the conveyor plate 210 and the scraper 208. When the conveyor plate 210 moves, the second spring 212 will also be compressed accordingly. When the scraper 208 passes the conveyor plate 210 through the guide part 20801, the fixing block 213 will reset the conveyor plate 210 under the elastic force of the second spring 212, waiting for the next squeezing and cleaning cycle of the scraper 208. Meanwhile, a vibration motor can be fixed at the part of the side plate 211 that is located in the collection box 214, and the vibration motor can be ensured not to affect the normal movement of the conveying plate 210. The vibration motor causes the side plate 211 and the conveying plate 210 to vibrate, thereby breaking the adhesion between the fiber impurities and the surface of the conveying plate 210, eliminating the sticky resistance of the plastic melt, and accelerating the fiber impurities and attached melt on the conveying plate 210 to slide quickly into the collection box 214, thus preventing impurities from accumulating on the surface of the conveying plate.

[0051] As a further improvement to the present invention, such as Figure 2 , Figure 13 , Figure 14 , Figure 15 and Figure 16 As shown, the filtering mechanism 3 includes a second pipe 301 fixedly connected to the fourth pipe 10. A filter cylinder 303 is fixedly connected to the inner side of the second pipe 301. A discharge port 30101 is opened in the second pipe 301 at the inner side of the collecting pipe 304. The filter cylinder 303 is designed in the shape of a cone. When the plastic melt passes through the filter cylinder 303, the filter cylinder 303 can filter the rigid non-melting impurities in the plastic melt. At the same time, under the pushing of the plastic melt and the guiding action of the filter cylinder 303, the rigid non-melting impurities will move along the surface of the filter cylinder 303 towards the discharge port 30101, so that the rigid non-melting impurities enter the inner side of the collecting pipe 304 through the discharge port 30101, so that the rigid non-melting impurities will not accumulate on the surface of the filter cylinder 303, thereby ensuring the normal operation of the filter cylinder 303 and ensuring that the plastic melt can flow normally to the inner side of the mold 11. A filter ring 302 is fixedly connected to the bottom end of the second pipe 301, and a third pipe 310 is fixedly connected to the bottom end of the filter ring 302. The third pipe 310 is fixedly connected to the mold 11. A bearing 305 and a shaft seal 306 are fixedly connected to the outer sides of the second pipe 301 and the third pipe 310. A collection pipe 304 is fixedly connected to the outer ring of the bearing 305 and the moving ring of the shaft seal 306. A discharge port 30401 is opened at the bottom end of the collection pipe 304, and a retaining ring 307 is fixedly connected to the bottom end of the collection pipe 304. The filter ring 302 can filter the plastic melt entering the inside of the collection tube 304, so that rigid non-melting impurities are temporarily stored inside the collection tube 304, ensuring that the rigid non-melting impurities will not affect the normal operation of the filter cylinder 303, and the impurities inside the collection tube 304 can be easily removed through the discharge port 30401, and the collection tube 304 and other related components can be cleaned. The shaft seal 306 can ensure the sealing between the collection pipe 304 and the second pipe 301 and the third pipe 310, preventing the plastic melt from flowing out between the collection pipe 304 and the second pipe 301 and the third pipe 310. When the collection pipe 304 is in normal use, the bottom of the collection pipe 304 can be blocked by the retaining ring 307.

[0052] As a further improvement to the present invention, such as Figure 13 , Figure 14 and Figure 15 As shown, a toothed ring 309 is fixedly connected to the outer side of the collection pipe 304, a support plate 311 is fixedly connected to one end of the second pipe 301, a third motor 312 is fixedly connected to one end of the support plate 311, and a gear 308 is fixedly connected to the end of the main shaft of the third motor 312, and the gear 308 meshes with the toothed ring 309. When the rigid non-fusible impurities are inside the collection pipe 304, the third motor 312 drives the collection pipe 304 to rotate rapidly through the gear 308 and the toothed ring 309. When the collection pipe 304 rotates rapidly, it generates centrifugal force. Under the action of centrifugal force, the rigid non-fusible impurities are moved away from the filter ring 302, thereby ensuring the normal operation of the filter ring 302.

[0053] The above are preferred embodiments of the present invention. The basic principles, main features and advantages of the present invention have been shown and described above. 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 only illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from the scope of protection of the present invention. All such changes and modifications fall within the scope of protection of the present invention as defined by the appended claims and their equivalents.

Claims

1. A single-screw extruder anti-clogging die head for waste plastic recycling, comprising a frame (4) and a die (11), characterized in that: The top of the frame (4) is fixedly connected to a support column (9), the top of the support column (9) is fixedly connected to a third heater (8), one end of the third heater (8) is fixedly connected to a cleaning mechanism (2), one end of the cleaning mechanism (2) is fixedly connected to a correction mechanism (1), and there are at least two correction mechanisms (1), and adjacent correction mechanisms (1) are fixedly connected by flanges. One end of one correction mechanism (1) is fixedly connected to a connecting pipe (5), the connecting pipe (5) is fixedly connected to the barrel of the single screw extruder, one end of the cleaning mechanism (2) is fixedly connected to a transition pipe (13), the bottom end of the transition pipe (13) is fixedly connected to a fourth pipe (10), the other end of the fourth pipe (10) is fixedly connected to a filter mechanism (3), and the other end of the filter mechanism (3) is fixedly connected to a mold (11).

2. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 1, characterized in that: One end of the transition tube (13) is fixedly connected to a cover plate (14), one end of the cover plate (14) is fixedly connected to a second motor (15), the end of the main shaft of the second motor (15) is fixedly connected to a spiral conveying rod (16), and the outside of the transition tube (13) is fixedly connected to a fourth heater (12).

3. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 1, characterized in that: The correction mechanism (1) includes a correction tube (101), a contraction tube (102), and an expansion tube (103). The contraction tube (102) and the expansion tube (103) are respectively fixed at both ends of the correction tube (101). The expansion tube (103) of the adjacent correction mechanism (1) is fixedly connected to the contraction tube (102). The contraction tube (102) at the head is fixedly connected to the connecting tube (5). The expansion tube (103) at the tail is fixedly connected to the cleaning mechanism (2). A first heater (6) is fixedly connected to the outside of the correction tube (101).

4. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 3, characterized in that: The angle between the inner wall generatrix of the contraction pipe (102) and the central axis of the correction pipe (101) is the contraction angle B, where B is 8°-12°. The angle between the inner wall generatrix of the expansion pipe (103) and the central axis of the correction pipe (101) is the expansion angle A, where A is 4°-8°.

5. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 3, characterized in that: A guide plate (104) is fixedly connected to the inner side of the correction tube (101), a fixing rod (105) is fixedly connected to the end of the correction tube (101), and a guide column (106) is fixedly connected to one end of the fixing rod (105).

6. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 3, characterized in that: The cleaning mechanism (2) includes a first pipe (201) fixedly connected to the expansion tube (103) at the tail end. A guide cylinder (202) is fixedly connected to the top end of the first pipe (201). A second heater (7) is fixedly connected to the outside of the guide cylinder (202). End caps (203) are fixedly connected to both ends of the guide cylinder (202). A first motor (204) is fixedly connected to one end of one end cap (203). A rotating roller (205) is fixedly connected to the end of the main shaft of the first motor (204). Guide rods (206) are fixedly connected to all four sides of the rotating roller (205). A scraper shell (208) is slidably connected to the outside of the guide rod (206). The scraper shell (208) includes a guide part (20801). A first spring (207) is fixedly connected to one end of the guide rod (206), and the other end of the first spring (207) is fixedly connected to the scraper shell (208).

7. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 6, characterized in that: The end of the scraper shell (208) is fixedly connected to a guide plate (209), and the guide plate (209) is slidably connected to the guide rod (206).

8. A single-screw extruder anti-clogging die head for waste plastic recycling according to claim 6, characterized in that: One end of the guide cylinder (202) is fixedly connected to a collection box (214), and a conveying plate (210) is slidably connected to the inner side of the collection box (214). The end of the conveying plate (210) is provided with a first scraping point (21001), and the two ends of the conveying plate (210) are fixedly connected to side plates (211). The side plates (211) are provided with a second scraping point (21101) near the first scraping point (21001). One end of the conveying plate (210) is fixedly connected to a fixing block (213), and one end of the fixing block (213) is fixedly connected to a second spring (212) that is fixedly connected to the collection box (214).

9. The anti-clogging die head for a single-screw extruder used for waste plastic recycling according to claim 1, characterized in that: The filtration mechanism (3) includes a second pipe (301) fixedly connected to the fourth pipe (10), a filter cylinder (303) fixedly connected to the inner side of the second pipe (301), a filter ring (302) fixedly connected to the bottom end of the second pipe (301), a third pipe (310) fixedly connected to the bottom end of the filter ring (302), and the third pipe (310) fixedly connected to the mold (11). A bearing (305) and a shaft seal (306) are fixedly connected to the outer sides of both the second pipe (301) and the third pipe (310). A collection pipe (304) is fixedly connected to the outer ring of the bearing (305) and the moving ring of the shaft seal (306). A discharge port (30101) is opened on the inner side of the second pipe (301) located in the collection pipe (304). A discharge port (30401) is opened at the bottom end of the collection pipe (304). A retaining ring (307) is fixedly connected to the bottom end of the collection pipe (304).

10. A single-screw extruder anti-clogging die head for waste plastic recycling according to claim 9, characterized in that: A toothed ring (309) is fixedly connected to the outside of the collection pipe (304), a support plate (311) is fixedly connected to one end of the second pipe (301), a third motor (312) is fixedly connected to one end of the support plate (311), and a gear (308) is fixedly connected to the end of the main shaft of the third motor (312), and the gear (308) meshes with the toothed ring (309).

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