A plastic article optimized injection molding system with a plastic reshaped structure

Abstract

The application relates to the technical field of plastic injection and discloses a plastic product optimized injection molding system provided with a plastic reshaping structure, which comprises an injection molding module; a conveying part; the conveying part comprises a barrel which is connected with the inside of the injection molding module; a screw is movably connected in the inside of the barrel; a glue applying assembly is arranged on the side of the screw close to the injection molding module; the glue applying assembly comprises a connecting rod which is connected with the end of the screw close to the injection molding module through screw threads; and the circumferential outer surface of the connecting rod is fixedly connected with a limiting block. The plastic product optimized injection molding system provided with the plastic reshaping structure can effectively solve the problems in the prior art that, due to the wide source and complex composition of recycled plastics, the material and types of recycled plastic particles are different, and the recycled plastic particles are mixed with impurities, so that the recycled plastic particles are difficult to melt in the high-temperature barrel, the surface of the injection molding product is uneven, the injection nozzle is even blocked in the injection stage, and the internal pressure of the barrel is too large to cause damage.

Description

Technical Field

[0001] This invention relates to the field of plastic injection technology, and more specifically to an optimized injection molding system for plastic products equipped with a plastic remodeling structure. Background Technology

[0002] Recycled plastic injection molding refers to the technical process of producing plastic products using recycled plastics as raw materials through injection molding. It is one of the core links in realizing the recycling of plastic resources. Its core logic is to pre-treat recycled waste plastic products by crushing and cleaning them, transforming them into raw materials that can meet the requirements of injection molding. Then, the raw materials are heated, melted, and injected into the mold cavity under high pressure through an injection molding machine, and after cooling and solidification, new plastic products are formed.

[0003] In existing technologies, due to the wide range of sources and complex composition of recycled plastics, the materials and types of recycled plastic particles are different and may contain impurities, making it difficult to melt in the high temperature of the barrel. This can cause uneven surface of the injection molded product, or even block the nozzle during the injection stage, leading to excessive pressure inside the barrel and damage. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides an optimized injection molding system for plastic products equipped with a plastic remolding structure. This system effectively solves the problems in existing technologies where recycled plastics are widely available, have complex compositions, and contain various materials and types of impurities. These impurities make it difficult for recycled plastics to melt at high temperatures in the barrel, resulting in uneven surfaces on the injection-molded products and even clogging of the nozzle during the injection stage, leading to excessive pressure inside the barrel and damage.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides an optimized injection molding system for plastic articles equipped with a plastic remodeling structure, comprising:

[0007] Injection molding modules;

[0008] The conveying unit includes a barrel that communicates with the inside of the injection molding module. A screw is movably connected inside the barrel, and an over-glue assembly is provided on the side of the screw near the injection molding module.

[0009] The gluing assembly includes a connecting rod, which is connected to the end of the screw near the injection molding module via a thread. A limit block is fixedly connected to the outer circumference of the connecting rod. A washer that fits against the outer surface of the limit block is sleeved on the outer circumference of the screw. A guide head is fixedly connected to the end of the connecting rod away from the screw. A limit ring is fixedly connected to the side of the guide head near the washer. A check ring is slidably connected to the inner circumference of the limit ring. A filter element is provided on the outer surface of the check ring.

[0010] The filter element includes a connecting ring, which is connected to the outer surface of a check ring via a threaded groove formed on its inner circumference. A filter plate is fixedly connected to the side of the connecting ring away from the screw. A cleaning component for cleaning the outer surface of the filter plate is provided inside the material cylinder.

[0011] Furthermore, the anti-reverse ring has an inclined groove on the side near the screw, the outer surface of the washer adopts a convex conical surface structure design that fits with the inner wall surface of the inclined groove, the filter plate adopts a conical cylindrical design, and the side of the filter plate away from the connecting ring slides in contact with the outer surface of the washer.

[0012] Furthermore, the cleaning component includes a connecting plate fixedly connected to the inner wall surface of the material cylinder, and a scraper that fits against the outer circumferential surface of the filter plate is fixedly connected to the side of the connecting plate away from the material cylinder.

[0013] Furthermore, the material cylinder is rotatably connected to an annular plate via a rotating groove formed on its inner wall. A connecting block is fixedly connected to the inner wall surface of the annular plate. A lifting plate that is in contact with the outer surface of the filter plate is slidably connected inside the connecting block. A limiting groove is formed on the inner wall surface of the material cylinder. A limiting post that is in contact with the inner wall surface of the limiting groove is fixedly connected to the side of the lifting plate away from the filter plate.

[0014] Furthermore, a top column is fixedly connected to the outer circumference of the material cylinder, a reciprocating plate is slidably connected to the inner wall surface of the top column, an arc plate is fixedly connected to the bottom end of the reciprocating plate, the bottom end of the arc plate passes through the material cylinder and is fixedly connected to a circular plate embedded inside the scraper, an elastic element is provided on the upper surface of the reciprocating plate and connected to the top end of the inner wall of the top column, and a feed pipe is fixedly connected to the outer circumference of the top column.

[0015] Furthermore, a drive seat is provided above the top column, and an output shaft is provided inside the drive seat. The bottom end of the output shaft passes through the top column and is fixedly connected to the upper surface of the reciprocating plate. The feed tube adopts an inclined design, and the highest point of the feed tube is close to the top column.

[0016] Furthermore, a fixing column is fixedly connected to the side of the connecting block away from the inner wall surface of the barrel, and a pressing block is fixedly connected to the side of the washer away from the guide head. The outer surface of the pressing block is designed with a bevel.

[0017] Furthermore, both the scraper and the circular plate have filter holes inside.

[0018] The technical solution provided by this invention has the following advantages compared with the prior art:

[0019] This invention includes a filter element and a cleaning element. The filter plate in the filter element adopts a sloping conical cylindrical structure, which increases the filtration area compared to conventional flat plate filters. The conical design allows the plastic melt to flow along the sloping surface, reducing the probability of filter pore clogging. Unmelted particles, metal shavings, and other impurities are intercepted on the surface of the filter plate, while pure melt enters the melt pool. This thoroughly solves the problem of surface defects and internal voids in products caused by fibers and dust in recycled materials, reducing the product defect rate. The filter plate can remove unmelted particles in real time, avoiding internal stress concentration caused by impurities hindering melt flow. When conventional injection molding machines process recycled materials, filter clogging requires machine shutdown for manual cleaning or replacement. However, in this equipment, during screw retraction and pre-plasticizing, the recycled plastic material pushes the anti-reverse ring, connecting ring, and filter plate backward in the melt pool. The scraper, fixedly connected to the inner wall of the barrel, slides relative to the moving filter plate. The lifting plate moves along the trajectory of the circular and bending sections in the limiting groove. The lifting plate carries impurities to the top of the scraper and circular plate, achieving self-cleaning of the filter plate. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the material cylinder according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the separation structure of the barrel, screw, and arc plate in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the separation structure of the glue-coating assembly, filter element, and ring plate in an embodiment of the present invention;

[0025] Figure 5 This is a partial cross-sectional structural diagram of the top column according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic cross-sectional view of the gasket according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the gasket, filter plate, connecting plate, scraper, and circular plate according to an embodiment of the present invention;

[0028] Figure 8 This is an embodiment of the present invention. Figure 2 A magnified structural diagram of part A in the middle;

[0029] Figure 9 This is a perspective structural diagram of the limiting groove according to an embodiment of the present invention.

[0030] The labels in the diagram represent: 1. Injection mold; 2. Conveying section; 21. Barrel; 211. Limiting groove; 22. Screw; 23. Gluing assembly; 231. Connecting rod; 232. Limiting block; 233. Washer; 234. Guide head; 235. Limiting ring; 236. Check ring; 24. Filter element; 241. Connecting ring; 242. Filter plate; 25. Cleaning element; 251. Connecting plate; 252. Scraper; 2521. Filter hole; 253. Ring plate; 2531. Connecting block; 254. Lifting plate; 255. Limiting post; 256. Arc plate; 257. Circular plate; 26. Top post; 261. Reciprocating plate; 262. Elastic element; 263. Feed tube; 264. Output shaft; 27. Fixed post; 271. Pressing block. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to embodiments. Example

[0033] Please see Figures 1-9 This invention provides a technical solution: an optimized injection molding system for plastic products equipped with a plastic remolding structure, comprising:

[0034] Injection module 1;

[0035] The conveying unit 2 includes a barrel 21 that is connected to the inside of the injection molding module 1. A screw 22 is movably connected inside the barrel 21. A glue-applied assembly 23 is provided on the side of the screw 22 near the injection molding module 1.

[0036] The gluing assembly 23 includes a connecting rod 231, which is connected to the end of the screw 22 near the injection molding module 1 by a thread. A limit block 232 is fixedly connected to the outer circumference of the connecting rod 231. A washer 233 that fits against the outer surface of the limit block 232 is sleeved on the outer circumference of the screw 22. A guide head 234 is fixedly connected to the end of the connecting rod 231 away from the screw 22. A limit ring 235 is fixedly connected to the side of the guide head 234 near the washer 233. A check ring 236 is slidably connected to the inner circumference of the limit ring 235. A filter element 24 is provided on the outer surface of the check ring 236.

[0037] The filter element 24 includes a connecting ring 241, which is connected to the outer surface of the check ring 236 via a threaded groove formed on its inner circumference. A filter plate 242 is fixedly connected to the side of the connecting ring 241 away from the screw 22. A cleaning element 25 for cleaning the outer surface of the filter plate 242 is provided inside the material cylinder 21.

[0038] The anti-reverse ring 236 has an inclined groove on the side near the screw 22. The outer surface of the washer 233 adopts a convex conical surface structure design that fits with the inner wall surface of the inclined groove. The filter plate 242 adopts a conical cylindrical design. The side of the filter plate 242 away from the connecting ring 241 slides in contact with the outer surface of the washer 233.

[0039] The cleaning component 25 includes a connecting plate 251 fixedly connected to the inner wall surface of the material cylinder 21, and a scraper 252 that is in contact with the outer circumference of the filter plate 242 is fixedly connected to the side of the connecting plate 251 away from the material cylinder 21.

[0040] The material cylinder 21 is rotatably connected to an annular plate 253 via a rotating groove formed on its inner wall. A connecting block 2531 is fixedly connected to the inner wall surface of the annular plate 253. A lifting plate 254 that is in contact with the outer surface of the filter plate 242 is slidably connected inside the connecting block 2531. A limiting groove 211 is formed on the inner wall surface of the material cylinder 21. A limiting post 255 that is in contact with the inner wall surface of the limiting groove 211 is fixedly connected to the side of the lifting plate 254 away from the filter plate 242.

[0041] A top column 26 is fixedly connected to the outer circumference of the material cylinder 21. A reciprocating plate 261 is slidably connected to the inner wall surface of the top column 26. An arc plate 256 is fixedly connected to the bottom end of the reciprocating plate 261. The bottom end of the arc plate 256 passes through the material cylinder 21 and is fixedly connected to a circular plate 257 embedded inside the scraper 252. An elastic element 262 connected to the top end of the inner wall of the top column 26 is provided on the upper surface of the reciprocating plate 261. A feed pipe 263 is fixedly connected to the outer circumference of the top column 26.

[0042] A drive seat is provided above the top column 26, and an output shaft 264 is provided inside the drive seat. The bottom end of the output shaft 264 passes through the top column 26 and is fixedly connected to the upper surface of the reciprocating plate 261. The feed tube 263 adopts an inclined design, and the highest point of the feed tube 263 is close to the side of the top column 26.

[0043] A fixing post 27 is fixedly connected to the side of the connecting block 2531 away from the inner wall surface of the barrel 21, and a pressing block 271 is fixedly connected to the side of the washer 233 away from the guide head 234. The outer surface of the pressing block 271 is designed with a bevel. Multiple fixing posts 27, pressing blocks 271 and lifting plates 254 are provided, and the multiple fixing posts 27, pressing blocks 271 and lifting plates 254 are arranged in a circumferential array with the axis of the barrel 21 as the center.

[0044] Both the scraper 252 and the circular plate 257 have filter holes 2521 inside.

[0045] Both scraper 252 and circular plate 257 are designed to be non-centered. The height and thickness of scraper 252 are designed to be gradually varied. The thickest point of scraper 252 is located on the side closer to arc plate 256, and the lowest point of scraper 252 is located on the side closer to arc plate 256.

[0046] The process of transporting recycled plastic raw materials:

[0047] In practical applications, a drive base is provided on the side of the barrel 21 away from the injection molding module 1 for transmission with the end of the screw 22. A feed port is fixedly connected to the upper surface of the barrel 21, and the feed port is close to the drive base. The recycled plastic, after undergoing pre-treatment steps of cleaning and crushing, is transferred from the feed port to the inside of the barrel 21, and the drive base drives the screw 22 to rotate inside the barrel 21.

[0048] Initially, the screw 22 is within its stroke range, near one end of the injection molding module 1. As the screw 22 continues to rotate, more and more material moves towards the injection molding module 1 under the action of the helical blades on the outer surface of the screw 22. Through the combined action of shearing force and external heating of the barrel 21, the screw 22 initially plasticizes the recycled plastic. During this process, impurities such as fibers and metal scraps in the recycled plastic move towards the glue-applying assembly 23 along with the melt.

[0049] A nozzle is located on the side of the barrel 21 near the injection mold 1, and the nozzle is connected to the interior of the injection mold 1. A melt pool is formed at the end of the barrel 21 near the nozzle. The plastic material enters the melt pool after passing through the gluing assembly 23. When the plastic material reaches the gluing assembly 23, the plastic melt pushes the check ring 236 (which slides relative to the screw 22) to the left (near the injection mold 1) under pressure, and the channel of the gluing assembly 23 is in the open state. The outer circumference of the check ring 236 is fixedly connected to the filter element 24 by threads. Therefore, the filter plate 242 moves to the left synchronously with the check ring 236 during this process. At the same time, the side of the filter plate 242 away from the connecting ring 241 is always in contact with the outer surface of the washer 233 during this process.

[0050] Recycled plastics, due to their wide and diverse sources, often contain impurities such as incompletely plasticized plastic particles, dust, and fibers. If these impurities enter the cavity of injection molding unit 1 along with the molten plastic, they will cause surface defects in the plastic product after injection molding. The presence of impurities can also lead to defects such as air bubbles and voids inside the plastic product. Unmelted plastic particles in the melt will hinder the uniform flow and filling of the melt, forming voids after cooling and solidification; some fibrous impurities will entangle together, forming weak points inside, reducing the mechanical strength of the product, and making the plastic product prone to cracking or damage during use. Filtering with filter plate 242 can remove these impurities that affect the internal quality of the injection molded product, ensuring the structural strength and stability of the plastic product. When the plastic material passes through filter plate 242, the inclined conical cylindrical design of filter plate 242 increases the filtration area and improves filtration efficiency. The melt smoothly passes through the gap between washer 233 (one side of washer 233 is tightly fitted to the outer surface of limit block 232, and the other side is fitted to the outer end of screw 22, and is in a fixed installation state with screw 22 and rotates synchronously with screw 22) and check ring 236, passes between check ring 236 and connecting rod 231, and passes through guide head 234 to reach the left side interior of barrel 21. At this time, unmelted particles and metal impurities are intercepted on the surface of filter plate 242, while the pure melt continues to flow to injection molding unit 1.

[0051] As the screw 22 moves axially to the right, it stores melt for the next injection. Simultaneously, the screw 22 continues to rotate, shearing, mixing, and melting the granules. The ring plate 253, connecting block 2531, and lifting plate 254 are connected to the inner wall of the barrel 21. The lifting plate 254 moves relative to the continuously rotating screw 22, disturbing the plastic material inside the barrel 21. Combined with the shearing action of the screw 22, this enhances the uniformity of the plastic melt (especially when mixing different batches of recycled material), reducing defects in the product caused by uneven plasticization.

[0052] The process of cleaning the surface of filter plate 242:

[0053] The screw 22, the glue-coating assembly 23, and the filter element 24 continue to move to the right. The distance between the working surface of the lifting plate 254 and the filter plate 242 gradually decreases. During this process, the right end of the pressing block 271 on the outer right side of the washer 233 penetrates between two adjacent fixed posts 27 (multiple connecting blocks 2531, lifting plates 254, and fixed posts 27 are provided and are arranged in a circular array with the axis of the ring plate 253 as the center. Multiple pressing blocks 271 are also arranged in a circular array with the axis of the ring plate 253 as the center. The number of pressing blocks 271 is the same as the number of fixed posts 27, and the two correspond one-to-one). The right side of the pressing block 271 adopts a pointed bevel design. When the pressing block 271 and the fixed post 27 gradually approach each other, the bevel of the pressing block 271 plays a guiding role to avoid collision. As the washer 233 drives the pressing block 271 to continuously rotate, taking one of the pressing blocks 271 as an example, when it is fully inserted between two adjacent fixed posts 27, the outer surface of the pressing block 271 follows the screw 22 to rotate and its outer surface is in contact with the outer circumference of one of the fixed posts 27, thus driving the fixed post 27 to rotate synchronously.

[0054] After the material has been conveyed inside the melt pool, the screw 22 continues to rotate. The pressure inside the melt pool is relatively high, and the check ring 236 moves to the right under the reverse pressure of the melt, engaging with the convex conical surface of the washer 233 to prevent melt backflow and ensure metering accuracy. During this process, the check ring 236 drives the filter plate 242 and connecting ring 241 to move synchronously to the right, further reducing the distance between the outer surface of the filter plate 242 and the lifting plate 254.

[0055] As the screw 22 continues to move to the right and rotate, the outer surface of the filter plate 242 will come into contact with the outer surfaces of multiple lifting plates 254. At this time, multiple lifting plates 254 simultaneously come into contact with the outer surfaces of the filter plate 242, dividing the filter plate 242 into multiple parts. The pressing block 271 drives the lifting plates 254 to rotate synchronously with the filter plate 242 through the fixing column 27. The connecting block 2531, the ring plate 253, the fixing column 27 are rotatably connected to the inside of the material cylinder 21, while the lifting plates 254 can slide horizontally in the left and right directions relative to the inside of the connecting block 2531. The lifting plates 254 are in contact with the inner wall surface of the limiting groove 211 through the limiting column 255 on their outer surface, thereby determining the relative position of the lifting plates 254 in the horizontal direction.

[0056] The limiting groove 211 can be divided into an annular section and a bent section. When the limiting post 255 is in the annular section of the limiting groove 211, the lifting plate 254 corresponding to the limiting post 255 is at the leftmost position within its stroke range. At this time, the outer surface of the lifting plate 254 is in contact with the outer surface of the filter plate 242 and the connecting ring 241. As the screw 22 continues to rotate, when it rotates to the top, the limiting post 255 will gradually enter the bent section in the limiting groove 211. At the same time, the lifting plate 254, which is fixedly connected to the limiting post 255, will gradually move towards the connecting plate 251 and the scraper 252. The filter residue located on the outer surface of the filter plate 242 between the lifting plate 254 and the lifting plate 254 above it will move towards the upper surface of the scraper 252 under the action of the lifting plate 254 (the thickness of the scraper 252 adopts a gradual design, which is thicker on the side near the arc plate 256 and thinner on the other side, so that the lifting plate 254 with a flexible material on the outer surface can move the filter residue from the outer surface of the filter plate 242 to the upper surface of the scraper 252). The top column 26, reciprocating plate 261, elastic element 262, arc plate 256, circular plate 257, scraper 252 and connecting plate 251 are not centered on the material cylinder 21, but are set on the side that is deviated from the vertical plane. Under this action, the side of scraper 252 near the vertical plane of material cylinder 21 is higher, and the highest point of scraper 252 is less than the highest point of the outer circumference of filter plate 242. The side of scraper 252 near arc plate 256 is lower.

[0057] As the scraper 252 approaches its highest point, the corresponding limiting post 255 begins to enter the bending section. The filter residue located on the outer surface of the filter plate 242 between the lifting plate 254 corresponding to the limiting post 255 and the lifting plate 254 above it will move towards the upper surface of the scraper 252 under the action of the lifting plate 254. Since the height of the lifting plate 254 is higher than that of the scraper 252 at this time, under the action of gravity, the filter residue will enter the space enclosed by the arc plate 256, the connecting plate 251, the connecting ring 241, the scraper 252, and the circular plate 257 (the scraper 252 and the circular plate 257 are arc-shaped plate-shaped objects that fit against the outer surface of the filter plate 242, and the circular plate 257 is embedded inside the scraper 252, with the side of the circular plate 257 being lower in height), and flow to the upper surface of the circular plate 257, stopping after it fits against the inner wall surface of the arc plate 256.

[0058] At this time, under the action of the bending section in the limiting groove 211, the limiting post 255 pulls the lifting plate 254 to slide to the right inside the connecting block 2531. While rotating around the material cylinder 21, the lifting plate 254 moves to the right to avoid collision with the connecting plate 251. After the limiting post 255 enters the straight part of the bending section, it drives the lifting plate 254 to the rightmost position within its forming range, and the lifting plate 254 is in a retracted state. As the screw 22 continues to rotate, the limiting post 255 reaches the leftward tilting part inside the bending section. The limiting post 255 drives the lifting plate 254 to gradually move to the left until the limiting post 255 enters the annular section in the limiting groove 211. At this time, the lifting plate 254 is in an unfolded state and once again fits against the outer surface of the filter plate 242.

[0059] The process of removing impurities:

[0060] During the cleaning process, the filter residue and impurities scraped off accumulate near the circular plate 257. The drive seat at the top of the top column 26 drives the output shaft 264 upwards. The reciprocating plate 261, influenced by the output shaft 264, moves the circular plate 257 upwards synchronously via the arc plate 256. The elastic element 262 gradually begins to compress; the elastic element 262 is preferably made of a high-temperature resistant spring. The arc plate 256 drives the circular plate 257 upwards, and the molten liquid flows downwards through the filter holes 2521. Impurities pass through the filter holes 2521 and remain on the upper surface of the circular plate 257. The circular plate 257 continues to rise until its lowest point is flush with the connection between the top column 26 and the feed pipe 263. A vacuum adsorber is also connected to the outer end of the feed pipe 263. Under the influence of gravity and vacuum adsorption, impurities are discharged from the upper surface of the circular plate 257 to the outside of the feed pipe 263, preventing impurities from accumulating at the connection between the material cylinder 21 and the top column 26. The inclined arrangement of the circular plate 257 and the feed pipe 263 creates traction on the large pieces of filter residue scraped off by the scraper 252 and the lifting plate 254, allowing them to be smoothly discharged along the inclined feed pipe 263, thus eliminating the risk of filter residue flowing back to the vicinity of the filter plate 242. The cleaning component 25 enables the removal of impurities during equipment operation, preventing impurities and filter residue from clogging the filter plate 242, which could lead to a sudden increase in melt flow resistance and an abnormal rise in plasticizing pressure.

[0061] After completion, the output shaft 264 is restored. The elastic element 262 is set so that the circular plate 257 is kept in contact with the filter plate 242 when it is not clean. The reciprocating plate 261 is at the lowest point of its stroke range. The lower surface of the reciprocating plate 261 is provided with a sealing ring, which is in contact with the groove on the inner wall surface of the top column 26. The feed pipe 263 is not connected to the inside of the material cylinder 21 to prevent melt leakage.

[0062] The injection molding process:

[0063] During injection, the screw 22 rapidly advances to the left, causing the filter element 24 to move to the left and detach from the cleaning element 25. The check ring 236, under melt pressure, tightly adheres to the limiting ring 235, preventing melt backflow. The melt, under injection pressure, is injected through the nozzle into the mold cavity of the injection mold 1. The check ring 236's anti-reverse design ensures pressure stability during injection, which is particularly important for materials like recycled plastics, which exhibit significant viscosity fluctuations. During the holding pressure stage, the screw 22 maintains pressure compensation, improving the density and dimensional accuracy of the product.

[0064] In summary, this injection molding system has the following advantages during the injection molding process:

[0065] Advantage 1: Filter plate 242 adopts a sloping conical cylindrical structure, which increases the filtration area compared to conventional flat plate filters. The conical design allows the plastic melt to flow along the sloping surface, reducing the probability of filter pore clogging. Unmelted particles, metal shavings, and other impurities are intercepted on the surface of filter plate 242, allowing pure melt to enter the melt pool. This completely solves the problem of surface defects and internal voids in products caused by fibers and dust in recycled materials, reducing the product defect rate. Filter plate 242 can remove unmelted particles in real time, avoiding internal stress concentration caused by impurities hindering melt flow, resulting in enhanced mechanical strength of the molded plastic products.

[0066] Advantage 2: To address the issues of significant compositional differences and uneven color or strength between batches of recycled materials, a disturbance structure consisting of an annular plate 253 and a lifting plate 254 is incorporated into the barrel 21. During the initial feeding process immediately after injection molding, the screw 22 rotates continuously. The annular plate 253, connecting block 2531, and lifting plate 254 are connected to the inner wall of the barrel 21. The relative movement between the lifting plate 254 and the screw 22 generates strong radial shear and disturbance to the melt, breaking the laminar flow state of the melt and promoting thorough mixing of different batches of recycled materials. This helps eliminate color differences and weld lines.

[0067] Thirdly, in conventional injection molding machines, filter screen clogging requires machine shutdown for manual cleaning or replacement. However, in this equipment, during the screw 22's retraction and pre-plasticizing process, the recycled plastic material pushes the check ring 236, connecting ring 241, and filter plate 242 backward within the melt pool. The scraper 252, fixedly connected to the inner wall of the barrel 21, slides relative to the moving filter plate 242. The lifting plate 254 moves along the trajectory from the annular section to the bending section of the limiting groove 211. The lifting plate 254 carries impurities to the top of the scraper 252 and the circular plate 257, achieving self-cleaning of the filter plate 242 without requiring machine shutdown. The annular plate 253 drives the lifting plates 254 to slide along the path within the limiting groove 211. Multiple lifting plates 254, distributed circumferentially, rotate synchronously with the filter plate 242, separating impurities on the filter plate 242 and its outer surface into multiple parts. This allows the impurities to rotate synchronously with the lifting plates 254 until they reach the position of the scraper 252 above, where the scraper 252 and the circular plate 257 collect them. The cleaning of the filter plate 242 is automatically triggered by the reciprocating motion of the screw 22 in the horizontal direction, requiring no additional power. This synchronizes injection molding with the cleaning of the filter plate 242, enabling continuous production of recycled plastics.

[0068] Fourthly, the scraper 252 adopts a gradually thickening design, with a thin and flexible front end, which can completely peel off the filter cake without damaging the filter plate 242, and the entire process requires no manual intervention. In the bending section of the limiting groove 211, the lifting plate 254 rotates while sliding horizontally to achieve a retraction action, avoiding collision with the connecting plate 251. When the lifting plate 254 begins to retract to the right, it is at the apex of its stroke range. Since the scraper 252, the circular plate 257, and the top column 26 are not centrally located, the scraper 252 is in contact with the outer surface of the filter plate 242 at an angle. The side of the scraper 252 away from the lifting plate 254 (the side closer to the arc plate 256) is the lowest point, and the impurities and filter cake will automatically enter the interior of the scraper 252 and the circular plate 257.

[0069] Fifthly, the impurities scraped off by the lifting plate 254 accumulate on the circular plate 257. The output shaft 264 drives the reciprocating plate 261 downward, and the arc plate 256 drives the circular plate 257 upward. After being filtered through the filter holes 2521, the impurities enter the interior of the top column 26 and are discharged along the inclined feed pipe 263. This allows the accumulated impurities to be discharged outward, achieving automatic impurity discharge. This avoids the problem of a sudden increase in melt flow resistance and abnormal rise in plasticizing pressure caused by impurities clogging the filter plate 242 and the circular plate 257, ensuring stable operation of the equipment, reducing the frequency and difficulty of manual cleaning, and improving production efficiency.

[0070] Advantage 6: The oil and moisture on the surface of recycled materials evaporate at high temperatures, forming a mixture of water vapor and oil gas. Recycled plastics generate a large amount of gas more easily than virgin plastics during the remolding and injection molding process. When the molten plastic is pushed by the screw 22 through the top column 26, and the output shaft 264 drives the reciprocating plate 261, the circular plate 257, and the arc plate 256 to move upward, the barrel 21 is connected to the inside of the feed pipe 263. Since the feed pipe 263 is connected to a vacuum adsorption component, when the molten plastic is pushed by the screw 22 through the top column 26, the gas on the surface of the melt is forcibly sucked into the feed pipe 263 and discharged along with impurities, avoiding the formation of bubbles inside the melt and affecting the finished plastic product.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optimized injection molding system for plastic products equipped with a plastic remolding structure, characterized in that, include: Injection module (1); The conveying unit (2) includes a barrel (21) that communicates with the inside of the injection molding module (1). A screw (22) is movably connected inside the barrel (21). A glue-coating assembly (23) is provided on the side of the screw (22) near the injection molding module (1). The gluing assembly (23) includes a connecting rod (231), which is connected to the end of the screw (22) near the injection molding module (1) by a thread. A limit block (232) is fixedly connected to the outer circumference of the connecting rod (231). A washer (233) that fits against the outer surface of the limit block (232) is sleeved on the outer circumference of the screw (22). A guide head (234) is fixedly connected to the end of the connecting rod (231) away from the screw (22). A limit ring (235) is fixedly connected to the side of the guide head (234) near the washer (233). A check ring (236) is slidably connected to the inner circumference of the limit ring (235). A filter element (24) is provided on the outer surface of the check ring (236). The filter element (24) includes a connecting ring (241), which is connected to the outer surface of the check ring (236) through a threaded groove formed on its inner circumference. A filter plate (242) is fixedly connected to the side of the connecting ring (241) away from the screw (22). A cleaning element (25) for cleaning the outer surface of the filter plate (242) is provided inside the material cylinder (21). The cleaning component (25) includes a connecting plate (251) fixedly connected to the inner wall surface of the material cylinder (21). A scraper (252) that fits against the outer circumference of the filter plate (242) is fixedly connected to the side of the connecting plate (251) away from the material cylinder (21). The material cylinder (21) is rotatably connected to a ring plate (253) through a rotating groove opened on its inner wall. A connecting block (2531) is fixedly connected to the inner wall surface of the ring plate (253). A lifting plate (254) that fits against the outer surface of the filter plate (242) is slidably connected inside the connecting block (2531). A limiting groove (211) is opened on the inner wall surface of the material cylinder (21). A limiting post (255) that fits against the inner wall surface of the limiting groove (211) is fixedly connected to the side of the lifting plate (254) away from the filter plate (242).

2. The optimized injection molding system for plastic products equipped with a plastic remolding structure according to claim 1, characterized in that: The anti-reverse ring (236) has an inclined groove on the side near the screw (22). The outer surface of the washer (233) adopts a convex conical surface structure design that fits with the inner wall surface of the inclined groove. The filter plate (242) adopts a conical cylindrical design. The side of the filter plate (242) away from the connecting ring (241) slides in contact with the outer surface of the washer (233).

3. The optimized injection molding system for plastic products equipped with a plastic remolding structure according to claim 1, characterized in that: The outer circumferential surface of the material cylinder (21) is fixedly connected to a top column (26), the inner wall surface of the top column (26) is slidably connected to a reciprocating plate (261), the bottom end of the reciprocating plate (261) is fixedly connected to an arc plate (256), the bottom end of the arc plate (256) penetrates the material cylinder (21) and is fixedly connected to a circular plate (257) embedded in the scraper (252), the upper surface of the reciprocating plate (261) is provided with an elastic element (262) connected to the top end of the inner wall of the top column (26), and the outer circumferential surface of the top column (26) is fixedly connected to a feed pipe (263).

4. The optimized injection molding system for plastic products equipped with a plastic remolding structure according to claim 3, characterized in that: A drive seat is provided above the top column (26), and an output shaft (264) is provided inside the drive seat. The bottom end of the output shaft (264) passes through the top column (26) and is fixedly connected to the upper surface of the reciprocating plate (261).

5. An optimized injection molding system for plastic products equipped with a plastic remolding structure according to claim 3, characterized in that: The connecting block (2531) is fixedly connected to a fixing column (27) on the side away from the inner wall surface of the barrel (21), and the washer (233) is fixedly connected to a pressing block (271) on the side away from the guide head (234). The outer surface of the pressing block (271) is designed with a bevel.

6. An optimized injection molding system for plastic products equipped with a plastic remolding structure according to claim 3, characterized in that: The scraper (252) and the circular plate (257) are both provided with filter holes (2521).

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