A single screw extruder anti-blocking head for waste plastic recycling

Abstract

The application discloses a single-screw extruder anti-blocking machine head for waste plastic recycling, and relates to the technical field of single-screw extruders, which comprises a rack and a die, 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, one end of the cleaning mechanism is fixedly connected with a correcting mechanism, the cleaning mechanism is arranged, after the fiber impurities corrected by the correcting mechanism in the flowing state pass through the first pipeline, the fiber impurities in the plastic melt are hooked by the scraper shell under the continuous rotation of the scraper shell, and the fiber impurities are taken out from the plastic melt, so that the fiber impurities in the plastic melt are cleaned, and the fiber impurities are prevented from causing the machine head to be blocked.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of single screw extruders, in particular to a single screw extruder anti-blocking head for waste plastic recycling. BACKGROUND

[0002] As a common extrusion equipment, the single screw extruder is used in the plastic processing industry. The single screw extruder is mainly used for extruding soft and hard polyvinyl chloride, polyethylene and other thermoplastic plastics, and can process various plastic products such as blown film, extruded tube, pressed plate, drawn wire and the like, and can also be used for melt granulation. The single screw extruder mainly consists of a barrel, a screw and a head, i.e. the screw and the barrel cooperate to extrude the molten material through the head.

[0003] The single screw extruder is also used in waste plastic recycling. Since the waste plastic contains rigid non-meltable impurities (metal, glass, sandstone, etc.) and fiber impurities (cotton / chemical fiber, glass fiber, etc.), although the waste plastic needs to be treated to remove impurities during melting, there are still cases of impurities being stuck in the actual melting process due to the need for back-and-forth turnaround and the large amount of waste plastic. When the impurities enter the head along with the plastic melt, the accumulation of rigid non-meltable impurities and fiber impurities inside the head discharge port forming die can easily cause the head to be blocked, thereby affecting the normal operation of the single screw extruder.

[0004] At present, most of the impurities in the plastic melt are filtered by a filter plate. The filter plate has good filtering effect on rigid non-meltable impurities, but has obvious limitations for filtering fiber impurities. When the fiber length is greater than the filter hole diameter, the two ends of the fiber are easily stuck in different filter holes, forming a "bridge" effect, thereby quickly forming a dense network layer on the filter surface, causing the flow channel to be blocked. If the fiber impurities flow axially in parallel in the flow field, they can easily penetrate the filter hole and reach the inside of the head discharge port forming die. The penetrated or unblocked fiber impurities accumulate inside the head, causing blockage failure, not only interrupting normal production, but also causing quality defects in the formed workpiece. Therefore, a single screw extruder anti-blocking head for waste plastic recycling is proposed to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a single screw extruder anti-blocking head for waste plastic recycling to solve the problems in the background art.

[0006] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0007] A single screw extruder anti-blocking machine head for waste plastic recycling, comprising a rack and a die, the top end of the rack is fixedly connected with a support column, the top end of the support column is fixedly connected with a third heater, one end of the third heater is fixedly connected with a cleaning mechanism, one end of the cleaning mechanism is fixedly connected with a correction mechanism, and the number of the correction mechanism is at least two, and adjacent correction mechanisms are fixedly connected through flanges, one end of one of the correction mechanisms is fixedly connected with a connecting pipe, the connecting pipe is fixedly connected with a barrel of a single screw extruder, one end of the cleaning mechanism is fixedly connected with a transition pipe, the bottom end of the transition pipe is fixedly connected with a fourth pipe, the other end of the fourth pipe is fixedly connected with a filter mechanism, and the other end of the filter mechanism is fixedly connected with the die.

[0008] Preferably, one end of the transition pipe is fixedly connected with a cover plate, one end of the cover plate is fixedly connected with a second motor, the main shaft end of the second motor is fixedly connected with a spiral conveying rod, and the outer side of the transition pipe is fixedly connected with a fourth heater.

[0009] Preferably, the correction mechanism comprises a correction pipe, a contraction pipe and an expansion pipe, the contraction pipe and the expansion pipe are fixedly connected at both ends of the correction pipe respectively, adjacent expansion pipes and contraction pipes of the correction mechanism are fixedly connected, the contraction pipe at the head is fixedly connected with the connecting pipe, the expansion pipe at the tail is fixedly connected with the cleaning mechanism, and the outer side of the correction pipe is fixedly connected with a first heater.

[0010] Preferably, the included angle between the inner wall generatrix of the contraction pipe and the center axis of the correction pipe is a contraction angle B, B is 8°-12°, and the included angle between the inner wall generatrix of the expansion pipe and the center axis of the correction pipe is an expansion angle A, A is 4°-8°.

[0011] Preferably, the inner side of the correction pipe is fixedly connected with a guide plate, the end of the correction pipe is fixedly connected with a fixed rod, and one end of the fixed rod is fixedly connected with a guide column.

[0012] Preferably, the cleaning mechanism comprises a first pipe fixedly connected with the expansion pipe at the tail, the top end of the first pipe is fixedly connected with a guide cylinder, the outer side of the guide cylinder is fixedly connected with a second heater, both ends of the guide cylinder are fixedly connected with end covers, one end of one of the end covers is fixedly connected with a first motor, the main shaft end of the first motor is fixedly connected with a rotating roller, the periphery of the rotating roller is fixedly connected with guide rods, the outer side of the guide rods is slidingly connected with a shell scraper, the shell scraper comprises a guide portion, one end of the guide rod is fixedly connected with a first spring, and the other end of the first spring is fixedly connected with the shell scraper.

[0013] Preferably, the end of the shell scraper is fixedly connected with a guide plate, and the guide plate is slidingly connected with the guide rod.

[0014] Preferably, one end of the guide cylinder is fixedly connected with a collecting box, the inner side of the collecting box is slidably connected with a material conveying plate, the end of the material conveying plate is provided with a first material scraping part, the two ends of the material conveying plate are fixedly connected with side plates, the side plates close to the first material scraping part are provided with second material scraping parts, one end of the material conveying plate is fixedly connected with a fixed block, and one end of the fixed block is fixedly connected with a second spring fixedly connected with the collecting box.

[0015] Preferably, the filtering mechanism comprises a second pipeline fixedly connected with the fourth pipeline, the inner side of the second pipeline is fixedly connected with a filter cylinder, the bottom end of the second pipeline is fixedly connected with a filter ring, the bottom end of the filter ring is fixedly connected with a third pipeline fixedly connected with the mold, the outer sides of the second pipeline and the third pipeline are fixedly connected with bearings and shaft seals, the outer rings of the bearings and the moving rings of the shaft seals are fixedly connected with collecting pipes, the second pipeline is provided with a discharging port at the inner side of the collecting pipe, the bottom end of the collecting pipe is provided with a discharging port, and the bottom end of the collecting pipe is fixedly connected with a blocking ring.

[0016] Preferably, the outer side of the collecting pipe is fixedly connected with a tooth ring, one end of the second pipeline is fixedly connected with a supporting plate, one end of the supporting plate is fixedly connected with a third motor, the main shaft tail end of the third motor is fixedly connected with a gear, and the gear is engaged with the tooth ring.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. A single-screw extruder anti-blocking head for waste plastic recycling is provided with a correction mechanism, which exerts directional stretching and guiding effect on fiber impurities in plastic melt through flow channel structure design (such as shrinkage-expansion flow channel, built-in flow guide member), forces the fiber impurities to adjust posture and finally keep parallel with the axial direction of the correction pipe, thereby facilitating the subsequent cleaning mechanism to separate and remove the fiber impurities from the melt.

[0019] 2. A single-screw extruder anti-blocking head for waste plastic recycling is provided with a cleaning mechanism, when the fiber impurities oriented by the correction mechanism flow through the first pipeline, they are effectively captured by the continuously rotating scraping shell and removed from the melt, thereby preventing the fiber impurities from blocking the head; in addition, the scraping shell can automatically complete surface cleaning during rotation, avoiding fiber accumulation and ensuring the continuous and stable cleaning efficiency.

[0020] 3. A single-screw extruder anti-blocking head for waste plastic recycling is provided with a filtering mechanism, which can filter rigid non-melting impurities in plastic melt, preventing the rigid non-melting impurities from blocking the head; and through the rapid rotation of the collecting pipe, the rigid non-melting impurities are moved away from the filter ring, preventing the rigid non-melting impurities from blocking the filter ring, thereby ensuring the stable operation of the filter ring. BRIEF DESCRIPTION OF DRAWINGS

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0022] Figure 1 It is a schematic view of the overall structure of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0023] Figure 2 It is a schematic view of the mounting structure of the connecting pipe of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0024] Figure 3 It is a schematic view of the structure of the correction mechanism of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0025] Figure 4 It is a schematic view of the internal structure of the correction mechanism of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0026] Figure 5 It is a sectional view of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0027] Figure 6 It is a schematic view of the structure of the cleaning mechanism of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0028] Figure 7 It is a schematic view of the mounting structure of the shell scraper of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0029] Figure 8 It is a schematic view of the side view mounting structure of the shell scraper of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0030] Figure 9 It is a schematic view of the structure of the anti-blocking machine head of the single-screw extruder for waste plastic recycling. Figure 8 at A.

[0031] Figure 10 It is a schematic view of the mounting structure of the material conveying plate of the anti-blocking machine head of the single-screw extruder for waste plastic recycling.

[0032] Figure 11Figure is the installation structure diagram of the first spring of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0033] Figure 12 Figure is the installation structure diagram of the second spring of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0034] Figure 13 Figure is the structure diagram of the filtering mechanism of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0035] Figure 14 Figure is the sectional view of the filtering mechanism of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0036] Figure 15 Figure is the installation structure diagram of the filtering ring of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0037] Figure 16 Figure is the installation structure diagram of the discharging port of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0038] Figure 17 Figure is the installation structure diagram of the spiral conveying rod of the anti-blocking machine head of the single screw extruder for waste plastic recycling.

[0039] In the figure: 1, correction mechanism; 101, correction pipe; 102, contraction pipe; 103, expansion pipe; 104, guide plate; 105, fixed rod; 106, guide column;

[0040] 2, cleaning mechanism; 201, first pipe; 202, guide cylinder; 203, end cover; 204, first motor; 205, rotating roller; 206, guide rod; 207, first spring; 208, shell scraper; 20801, guide part; 209, guide plate; 210, material conveying plate; 21001, first material scraping position; 211, side plate; 21101, second material scraping position; 212, second spring; 213, fixed block; 214, collection box;

[0041] 3, filtering mechanism; 301, second pipe; 30101, discharging port; 302, filtering ring; 303, filtering cylinder; 304, collecting pipe; 30401, discharging port; 305, bearing; 306, shaft seal; 307, blocking ring; 308, gear; 309, gear ring; 310, third pipe; 311, support plate; 312, third motor;

[0042] 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

[0043] 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.

[0044] 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.

[0045] Example

[0046] 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.

[0047] The connecting pipe 5 is fixedly connected with the barrel of the single-screw extruder, and the plastic melt enters the inside of the connecting pipe 5 through the barrel of the single-screw extruder, and then enters the inside of the correction mechanism 1 through the connecting pipe 5;

[0048] One end of the cleaning mechanism 2 is fixedly connected with a transition pipe 13, the bottom end of the transition pipe 13 is fixedly connected with a fourth pipeline 10, and the transition pipe 13 and the fourth pipeline 10 are used for transferring the plastic melt after the fiber impurities are cleaned; the other end of the fourth pipeline 10 is fixedly connected with a filtering mechanism 3, and the other end of the filtering mechanism 3 is fixedly connected with a mold 11, and the mold 11 is used for forming a workpiece.

[0049] As a further improvement of the present application, as shown in Figure 2 and Figure 17 One end of the transition pipe 13 is fixedly connected with a cover plate 14, one end of the cover plate 14 is fixedly connected with a second motor 15, the main shaft end of the second motor 15 is fixedly connected with a spiral conveying rod 16, one end of the spiral conveying rod 16 extends into the inside of the first pipeline 201, the end of the spiral conveying rod 16 does not touch the scraping shell 208, and the outside of the transition pipe 13 is fixedly connected with a fourth heater 12; the fourth heater 12 can be used for maintaining the temperature inside the transition pipe 13 stable in real time (matching the plasticizing temperature requirement of the plastic melt), avoiding the viscosity of the melt rising sharply and the flow being blocked due to the temperature drop, and ensuring that the plastic melt can smoothly pass through the transition pipe 13 and enter the fourth pipeline 10;

[0050] When the second motor 15 drives the spiral conveying rod 16 to rotate, a directional pushing force can be formed on the plastic melt in the cleaning mechanism 2 after the fiber impurities are removed, the melt is accelerated to be conveyed to the mold 11 through the fourth pipeline 10 and the filtering mechanism 3; meanwhile, the continuous rotation of the spiral conveying rod 16 can provide stable pushing pressure for the plastic melt, avoiding pressure fluctuation at the discharge end of the mold 11, and further ensuring the density uniformity and appearance integrity of the formed workpiece.

[0051] As a further improvement of the present application, as shown in Figure 2 , Figure 3 , Figure 4 and Figure 5 The correction mechanism 1 comprises a correction pipe 101, a contraction pipe 102 and an expansion pipe 103, the contraction pipe 102 and the expansion pipe 103 are fixed at two ends of the correction pipe 101 respectively, the expansion pipe 103 and the contraction pipe 102 of the adjacent correction mechanism 1 are fixedly connected, the contraction pipe 102 at the head is fixedly connected with the connecting pipe 5, the expansion pipe 103 at the tail is fixedly connected with the cleaning mechanism 2, and the outside of the correction pipe 101 is fixedly connected with a first heater 6;

[0052] The temperature inside the correction pipe 101 can be maintained stable in real time by the first heater 6 (matching the plasticizing temperature range of the plastic melt): on the one hand, the viscosity of the plastic melt can be prevented from rising due to temperature drop, and the plastic melt can smoothly pass through the correction pipe 101 and enter the subsequent cleaning mechanism 2; on the other hand, the stable temperature can keep the plastic melt in a low-viscosity state, reduce the movement resistance of the fiber impurities in the melt, and make the fiber impurities more easily oriented axially under the action of the stretching force exerted by the flow channel structure (such as the contraction pipe 102 and the guide plate 104) in the correction pipe, thereby laying a foundation for the subsequent cleaning mechanism 2 to accurately remove the fiber impurities.

[0053] The plastic melt inside the connecting pipe 5 will first pass through the contraction pipe 102 and the correction pipe 101, and the mutual cooperation of the contraction pipe 102 and the correction pipe 101 will generate a directional stretching force on the plastic melt, and the expansion pipe 103 can buffer the pressure and stabilize the flow field. The design of multiple continuous contraction pipes 102, correction pipes 101 and expansion pipes 103 can realize “multiple stretching - posture correction”, specifically:

[0054] The fiber impurities are easily affected by the stretching force and “straightly oriented” in the plastic melt. A single contraction pipe 102 can stretch the fibers deviating from the axial direction (such as 30°-60° from the axial direction) to close to the axial direction (deviation ≤15°); the fiber impurities continuously pass through multiple contraction pipes 102, correction pipes 101 and expansion pipes 103 to further “iteratively correct”, and finally the axial orientation ratio of the fiber impurities is increased from 60%-70% to 90% or more, thereby laying a foundation for the subsequent cleaning mechanism to remove the fiber impurities;

[0055] A single contraction pipe 102 and a correction pipe 101 are prone to “excessive stretching” at the end, resulting in uneven flow rate of the melt; and the continuous structure of “contraction-expansion-recontraction-expansion” can release the local pressure through the expansion pipe 103, avoid vortex flow of the plastic melt due to sudden pressure rise, and reduce the risk of the fiber impurities deviating from the axial direction again.

[0056] As a further improvement of the present application, as shown in Figure 5 The included angle between the inner wall generatrix of the contraction pipe 102 and the pipe center axis of the correction pipe 101 is the contraction angle B, the contraction angle of a single contraction pipe 102 is controlled within 8°-12° (avoiding >15°), and multiple contraction pipes 102 have the same contraction angle B; if the contraction angle B is too small (<8°), the stretching force is insufficient, and the posture correction efficiency of the fiber impurities is low; if the contraction angle is too large (>15°), the flow rate of the plastic melt in the contraction pipe 102 rises suddenly, and “shear vortex” is easily formed near the correction pipe 101, resulting in the fiber impurities deviating from the axial direction again;

[0057] The included angle between the inner wall generatrix of the expansion pipe 103 and the pipe center axis of the correction pipe 101 is an expansion angle A, A is 4°-8°; the expansion angle A is 1 / 2-2 / 3 of a contraction angle B (i.e. 4°-8°), and the inner diameter of the end of the expansion pipe 103 is consistent with the initial inner diameter of the contraction pipe 102, the expansion angle A needs to be smaller than the contraction angle B, so as to avoid that the melt is caused to flow back and vortex due to too fast expansion; the consistent inner diameter can reduce the sudden change of the flow passage cross section, ensure the smooth transition of the plastic melt, and prevent the fiber impurities from being stuck and deviated at the sudden change of the cross section.

[0058] Meanwhile, the total length L1 of the contraction pipe 102 and the correction pipe 101 is greater than the length L2 of the expansion pipe 103, L1:L2=2:1-3:1, the total length of the contraction pipe 102 and the correction pipe 101 needs to be long enough to ensure that the fiber impurities have sufficient time to be stretched and oriented; the expansion pipe 103 is short and gentle, and is only used for buffering pressure to avoid that the fiber impurities rebound and deviate due to the disappearance of the stretching force in the expansion pipe 103.

[0059] As a further improvement of the present application, as shown in Figure 4 and Figure 5 , the inner side of the correction pipe 101 is fixedly connected with a flow guide plate 104, the number of the flow guide plate 104 is 3-4, and the flow guide plate 104 is uniformly distributed in the circumferential direction on the inner side of the correction pipe 101 and has a length consistent with the correction pipe 101, which functions to divide the flow passage and divide the wide flow field into multiple small flow passages, so as to avoid that the melt appears transverse flow in the contraction section and forcibly orient the fiber impurities along the axial direction.

[0060] The end of the correction pipe 101 is fixedly connected with a fixed rod 105, one end of the fixed rod 105 is fixedly connected with a flow guide column 106, which functions to stabilize the flow field in the central region and avoid that the plastic melt forms a rotating flow in the pipe center, so as to ensure that the fiber impurities are oriented in the full cross section and along the axial direction from the center of the correction pipe 101 to the pipe wall.

[0061] As a further improvement of the present application, as shown in Figure 2 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the cleaning mechanism 2 includes a first pipe 201 fixedly connected with the expansion pipe 103 at the tail, the top end of the first pipe 201 is fixedly connected with a guide cylinder 202, a through slot is formed in the top of the first pipe 201 and communicates with the guide cylinder 202, so that the shell scraper 208 can extend into the inner side of the first pipe 201 to clean the fiber impurities;

[0062] The outer side of the guide cylinder 202 is fixedly connected with a second heater 7, and the bottom of the guide cylinder 202 is also fixedly connected with a third heater 8. The first pipeline 201 and the guide cylinder 202 can be heated simultaneously through the second heater 7 and the third heater 8, so as to ensure the viscosity of the plastic melt and ensure that the fiber impurities are more easily taken out by the scraping shell 208 in the low-viscosity plastic melt.

[0063] Both ends of the guide cylinder 202 are fixedly connected with end covers 203. One end of one of the end covers 203 is fixedly connected with a first motor 204. The main shaft end of the first motor 204 is fixedly connected with a rotating roller 205. The rotating roller 205 is fixedly connected with guide rods 206 around the periphery. The guide rods 206 are slidingly connected with scraping shells 208 on the outer side. The scraping shells 208 include guide portions 20801. The guide rods 206 and the scraping shells 208 are both arranged in an arc shape, so that after the fiber impurities are hooked by the scraping shells 208, the fiber impurities are not easy to fall off from the top of the scraping shells 208. The guide rods 206 and the scraping shells 208 are both provided in plurality and are uniformly distributed around the periphery of the rotating roller 205, so as to ensure the cleaning effect of the fiber impurities.

[0064] One end of the guide rod 206 is fixedly connected with a first spring 207, and the other end of the first spring 207 is fixedly connected with the scraping shell 208. The first spring 207 provides a pushing force to the scraping shell 208, so as to ensure that the scraping shell 208 can extend into the inner side of the first pipeline 201.

[0065] When the plastic melt enters the inner side of the first pipeline 201, the first motor 204 will also rotate the guide rods 206 and the scraping shells 208 clockwise (from right to left) through the rotating roller 205. During the rotation of the scraping shells 208 in the inner side of the first pipeline 201, the arc-shaped hooking surface of the scraping shells 208 will capture the axial fiber impurities flowing through, and the impurities will be stripped from the plastic melt by the rotating action and will be carried out of the first pipeline 201 together with the guide rods 206, so as to realize the cleaning of the fiber impurities in the plastic melt and reduce the probability of the fiber impurities blocking the nozzle. When the scraping shells 208 and the guide rods 206 enter the guide cylinder 202 from the first pipeline 201, the scraping shells 208 will first retract (compress the matched first spring 207) under extrusion, so as to adapt the space connection of the two components and ensure the smoothness of the rotating action.

[0066] As a further improvement of the present application, as shown in Figure 9 and Figure 11 The end of the scraping shell 208 is fixedly connected with a guide plate 209, and the guide plate 209 is slidingly connected with the guide rod 206. The guide plate 209 facilitates the movement of the scraping shell 208 to the first scraping position 21001 of the material conveying plate 210, so as to prevent the scraping shell 208 from being stuck with the first scraping position 21001.

[0067] As a further improvement of the present application, as shown inFigure 2 、 Figure 7 、 Figure 10 、 Figure 11 and Figure 12 As shown in the drawings, one end of the guide cylinder 202 is fixedly connected with a collection box 214, a sealing cover can be arranged at the top end of the collection box 214, when the collection box 214 collects the fiber impurities, the collection box 214 can be covered by the sealing cover to avoid the impurities being polluted by the outside during the collection process, and at the same time, prevent the plastic melt volatiles in the collection box 214 from leaking out, and at the same time, a heating plate can be additionally arranged inside the sealing cover, the heating plate can maintain the temperature inside the collection box 214 stable (match the heat preservation requirement of the plastic melt), avoid a small amount of plastic melt attached to the surface of the fiber impurities from solidifying and caking due to the temperature drop, both prevent the solidified melt from sticking the fiber impurities to the inner wall of the collection box 214, and also make the subsequent sorting, cleaning and other processing operations of the fiber impurities more convenient;

[0068] The inner side of the collection box 214 is slidably connected with a material conveying plate 210, the end of the material conveying plate 210 is provided with a first material scraping part 21001, both ends of the material conveying plate 210 are fixedly connected with side plates 211, the side plates 211 are provided with second material scraping parts 21101 near the first material scraping part 21001, one end of the material conveying plate 210 is fixedly connected with a fixed block 213, one end of the fixed block 213 is fixedly connected with a second spring 212 fixedly connected with the collection box 214;

[0069] When the scraping shell 208 carrying the fiber impurities rotates to the end position of the material conveying plate 210 and the side plates 211, the front end surface and the side surface of the scraping shell 208 attached with the impurities will be closely attached with the first material scraping part 21001 of the material conveying plate 210 and the second material scraping part 21101 of the side plates 211 respectively, with the scraping shell 208 continuing to rotate around the central axis of the rotating roller 205, the surface of the scraping shell 208 and the first material scraping part 21001 and the second material scraping part 21101 will form a continuous relative sliding; the first material scraping part 21001 mainly peels off the fiber impurities and the attached melt on the front end surface of the scraping shell, and the second material scraping part 21101 specifically removes the residual impurities on the side surface of the scraping shell, the double scraping effect can completely peel off the fiber impurities and a small amount of plastic melt on the surface of the scraping shell 208, and make them fall on the bearing surface of the material conveying plate 210, to make a clean preparation for the next cycle of impurity grabbing of the scraping shell 208;

[0070] And the shell scraping 208 rotates will extrude the feed plate 210, the feed plate 210 along the guide cylinder 202 and the collection tank 214 the interface slide way to the inside of the collection tank 214 slide, the slide design avoids the feed plate 210 to hinder the rotation track of the shell scraping 208, guarantees the normal rotation of the shell scraping 208, and can ensure that the first scraping place 21001 the cleaning effect of the impurities on the surface of the shell scraping 208 is not interrupted through the continuous adhesion of the feed plate 210 and the shell scraping 208;When the feed plate 210 moves, the second spring 212 will also be compressed accordingly, when the shell scraping 208 passes through the guide part 20801 and passes the feed plate 210, the fixed block 213 is reset with the feed plate 210 under the elastic force of the second spring 212, waiting for the next extrusion and cleaning cycle of the shell scraping 208;

[0071] At the same time, the vibration motor can be fixed at the part of the side plate 211 in the collection tank 214, and the vibration motor does not affect the normal movement of the feed plate 210, the side plate 211 and the feed plate 210 are vibrated through the vibration motor, the adhesion of the fiber impurities on the surface of the feed plate 210 is broken through vibration, the viscosity resistance of the plastic melt is eliminated, the fiber impurities and the attached melt on the feed plate 210 are quickly slid to the inside of the collection tank 214, and the accumulation of impurities on the surface of the feed plate is avoided.

[0072] As a further improvement of the application, as shown in Figure 2 、 Figure 13 、 Figure 14 、 Figure 15 And Figure 16 The filter mechanism 3 includes a second pipeline 301 fixedly connected with the fourth pipeline 10, a filter cylinder 303 is fixedly connected inside the second pipeline 301, a discharge port 30101 is arranged at the inside of the collection pipe 304, the filter cylinder 303 is designed in a conical cylinder shape, when the plastic melt passes through the filter cylinder 303, the filter cylinder 303 can filter the rigid and non-melting impurities in the plastic melt, and under the pushing of the plastic melt and the guidance of the filter cylinder 303, the rigid and non-melting impurities will move along the surface of the filter cylinder 303 to the direction close to the discharge port 30101, so that the rigid and non-melting impurities enter the inside of the collection pipe 304 through the discharge port 30101, so that the rigid and non-melting impurities will not accumulate on the surface of the filter cylinder 303, thereby ensuring the normal work of the filter cylinder 303 and ensuring that the plastic melt can normally flow to the inside of the mold 11;

[0073] The bottom end of the second pipe 301 is fixedly connected with a filter ring 302, the bottom end of the filter ring 302 is fixedly connected with a third pipe 310, and the third pipe 310 is fixedly connected with the mold 11, the outer sides of the second pipe 301 and the third pipe 310 are fixedly connected with a bearing 305 and a shaft seal 306, the outer ring of the bearing 305 and the moving ring of the shaft seal 306 are fixedly connected with a collecting pipe 304, the bottom end of the collecting pipe 304 is provided with a discharging port 30401, and the bottom end of the collecting pipe 304 is fixedly connected with a blocking ring 307;

[0074] The filter ring 302 can filter the plastic melt entering the inner side of the collecting pipe 304, so that the rigid non-melt impurities are temporarily stored on the inner side of the collecting pipe 304, so that the rigid non-melt impurities do not affect the normal work of the filter cartridge 303, and the impurities on the inner side of the collecting pipe 304 are conveniently taken out through the discharging port 30401, and the collecting pipe 304 and other related components are cleaned;

[0075] The shaft seal 306 can ensure the sealing between the collecting pipe 304 and the second pipe 301 and the third pipe 310, so that the plastic melt does not flow out from between the collecting pipe 304 and the second pipe 301 and the third pipe 310, and the blocking ring 307 can be used to block the bottom of the collecting pipe 304 when the collecting pipe 304 is normally used.

[0076] As a further improvement of the present application, as shown in Figure 13 、 Figure 14 and Figure 15 , the outer side of the collecting pipe 304 is fixedly connected with a tooth ring 309, one end of the second pipe 301 is fixedly connected with a support plate 311, one end of the support plate 311 is fixedly connected with a third motor 312, the main shaft end of the third motor 312 is fixedly connected with a gear 308, and the gear 308 is engaged with the tooth ring 309, when the rigid non-melt impurities are on the inner side of the collecting pipe 304, the third motor 312 drives the collecting pipe 304 to rotate quickly through the gear 308 and the tooth ring 309, and the collecting pipe 304 rotates quickly to generate a centrifugal force, which drives the rigid non-melt impurities away from the filter ring 302, so as to ensure the normal work of the filter ring 302.

[0077] The above is the preferred embodiment of the present application, the basic principles and main features of the present application and the advantages of the present application are shown and described, those skilled in the art should understand that the present application is not limited by the above examples, the above examples and the description in the specification are only to illustrate the principles of the present application, without departing from the scope of protection of the present application, the present application can also have various changes and improvements, and these changes and improvements all fall within the scope of the present application, and the scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A single screw extruder anti-jamming head for waste plastic recycling comprising a frame (4) and a die (11), characterized in that: The top end of the rack (4) is fixedly connected with a support column (9), the top end of the support column (9) is fixedly connected with a third heater (8), one end of the third heater (8) is fixedly connected with a cleaning mechanism (2), one end of the cleaning mechanism (2) is fixedly connected with a correction mechanism (1), the number of the correction mechanism (1) is at least two, adjacent correction mechanisms (1) are fixedly connected through flanges, one end of one of the correction mechanisms (1) is fixedly connected with a connecting pipe (5), the connecting pipe (5) is fixedly connected with a barrel of a single screw extruder, one end of the cleaning mechanism (2) is fixedly connected with a transition pipe (13), the bottom end of the transition pipe (13) is fixedly connected with a fourth pipe (10), the other end of the fourth pipe (10) is fixedly connected with a filtering mechanism (3), the other end of the filtering mechanism (3) is fixedly connected with a mold (11); The correction mechanism (1) comprises a correction pipe (101), a contraction pipe (102) and an expansion pipe (103), the contraction pipe (102) and the expansion pipe (103) are fixedly connected at two ends of the correction pipe (101), adjacent expansion pipes (103) and contraction pipes (102) of the correction mechanism (1) are fixedly connected, the contraction pipe (102) at the head is fixedly connected with the connecting pipe (5), the expansion pipe (103) at the tail is fixedly connected with the cleaning mechanism (2), the outer side of the correction pipe (101) is fixedly connected with a first heater (6); The cleaning mechanism (2) comprises a first pipe (201) fixedly connected with the expansion pipe (103) at the tail, the top end of the first pipe (201) is fixedly connected with a guide cylinder (202), the outer side of the guide cylinder (202) is fixedly connected with a second heater (7), both ends of the guide cylinder (202) are fixedly connected with end covers (203), one end of one of the end covers (203) is fixedly connected with a first motor (204), the main shaft end of the first motor (204) is fixedly connected with a rotating roller (205), the periphery of the rotating roller (205) is fixedly connected with guide rods (206), the outer side of the guide rod (206) is slidably connected with a shell scraping piece (208), the shell scraping piece (208) comprises a guide part (20801), one end of the guide rod (206) is fixedly connected with a first spring (207), and the other end of the first spring (207) is fixedly connected with the shell scraping piece (208); One end of the guide cylinder (202) is fixedly connected with a collecting box (214), the inner side of the collecting box (214) is slidably connected with a material conveying plate (210), the end of the material conveying plate (210) is provided with a first material scraping part (21001), the two ends of the material conveying plate (210) are fixedly connected with side plates (211), the side plates (211) are provided with second material scraping parts (21101) close to the first material scraping parts (21001), one end of the material conveying plate (210) is fixedly connected with a fixed block (213), one end of the fixed block (213) is fixedly connected with a second spring (212) fixedly connected with the collecting box (214); when the shell (208) carrying the fiber impurities rotates to the end position of the material conveying plate (210) and the side plates (211), the front end face and the side face of the shell (208) attached with the impurities will be closely attached to the first material scraping parts (21001) of the material conveying plate (210) and the second material scraping parts (21101) of the side plates (211) respectively, and as the shell (208) continues to rotate around the central axis of the rotating roller (205), a continuous relative sliding will be formed between the surface of the shell (208) and the first material scraping parts (21001) and the second material scraping parts (21101); and the shell (208) will extrude the material conveying plate (210) when rotating, so that the material conveying plate (210) slides along the connecting slide of the guide cylinder (202) and the collecting box (214) to the inner side of the collecting box (214); the second spring (212) will also be compressed correspondingly when the material conveying plate (210) moves, and when the shell (208) passes through the guide part (20801) and exceeds the material conveying plate (210), the fixed block (213) with the material conveying plate (210) is reset under the elastic force of the second spring (212), waiting for the next extrusion and cleaning cycle of the shell (208).

2. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 1 wherein: One end of the transition pipe (13) is fixedly connected with a cover plate (14), one end of the cover plate (14) is fixedly connected with a second motor (15), the main shaft end of the second motor (15) is fixedly connected with a spiral conveying rod (16), and the outer side of the transition pipe (13) is fixedly connected with a fourth heater (12).

3. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 1 wherein: The included angle between the inner wall generatrix of the contraction pipe (102) and the pipe center axis of the correction pipe (101) is a contraction angle B, B is 8°-12°, and the included angle between the inner wall generatrix of the expansion pipe (103) and the pipe center axis of the correction pipe (101) is an expansion angle A, A is 4°-8°.

4. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 1 wherein: The inner side of the correction pipe (101) is fixedly connected with a flow guide plate (104), and the end of the correction pipe (101) is fixedly connected with a fixed rod (105).

5. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 1 wherein: The end of the shell (208) is fixedly connected with a guide plate (209), and the guide plate (209) is slidably connected with the guide rod (206).

6. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 1 wherein: The filtering mechanism (3) comprises a second pipeline (301) fixedly connected with the fourth pipeline (10), the inner side of the second pipeline (301) is fixedly connected with a filter cylinder (303), the bottom end of the second pipeline (301) is fixedly connected with a filter ring (302), the bottom end of the filter ring (302) is fixedly connected with a third pipeline (310), the third pipeline (310) is fixedly connected with a mold (11), the outer sides of the second pipeline (301) and the third pipeline (310) are fixedly connected with a bearing (305) and a shaft seal (306), the outer ring of the bearing (305) and the moving ring of the shaft seal (306) are fixedly connected with a collecting pipe (304), a discharging port (30101) is arranged on the inner side of the collecting pipe (304), a discharging port (30401) is arranged on the bottom end of the collecting pipe (304), and the bottom end of the collecting pipe (304) is fixedly connected with a blocking ring (307).

7. A single screw extruder anti-jamming head for recycling of waste plastics as claimed in claim 6 wherein: The outer side of the collecting pipe (304) is fixedly connected with a tooth ring (309), one end of the second pipeline (301) is fixedly connected with a supporting plate (311), one end of the supporting plate (311) is fixedly connected with a third motor (312), the main shaft tail end of the third motor (312) is fixedly connected with a gear (308), and the gear (308) is engaged with the tooth ring (309).

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