A premixing and modification device for recycled plastic granules from automotive parts

Abstract

This invention relates to the field of automotive parts processing technology, specifically disclosing a premixing and modification device for recycled plastic granules from automotive parts. The device includes a base, a crushing box fixedly connected to the top of the base via a first support column, a crushing assembly installed inside the crushing box, a mixing cylinder fixedly connected to the top of the base, lifting assemblies symmetrically installed on the outer wall of the mixing cylinder, a lifting seat installed on the top of the mixing cylinder via the lifting assemblies, an agitator installed on the top of the lifting seat, and a drive shaft symmetrically rotatably connected to the bottom of the lifting seat. A stirring roller is threadedly connected to the bottom of the drive shaft via an mounting assembly. This invention allows maintenance personnel to quickly locate faulty parts without complex disassembly of the entire device, allowing for individual replacement of the damaged stirring roller. This significantly shortens maintenance time, reduces maintenance difficulty, and allows for flexible switching between stirring rollers suitable for different formulations or processes, meeting the diverse and mass production needs of automotive parts.

Description

Technical Field

[0001] This invention relates to the field of plastic recycling technology, and in particular to a premixing and modification device for recycling plastic granules from automotive parts. Background Technology

[0002] With increasing global emphasis on environmental protection and the circular economy, the automotive manufacturing industry is actively promoting the use of recycled plastics to replace virgin plastics in order to reduce its carbon footprint and production costs. Recycled plastic granules, obtained from the recycling, crushing, and washing of end-of-life automotive parts (such as bumpers, dashboards, and door panels), have become an important raw material for manufacturing new parts. However, due to their diverse origins and the fact that recycled plastics have undergone one or more processing and usage cycles, their physical properties, chemical stability, and batch consistency are far inferior to virgin plastics. Specifically, recycled plastic granules generally suffer from performance degradation, impurities, and uneven size. To "upgrade" and reuse them in automotive parts with stringent requirements for mechanical properties and appearance consistency, they must undergo precise premixing and modification treatments.

[0003] An ideal premixing and modification process aims to address the inherent deficiencies of recycled plastics. This process first requires efficient grinding (such as double-roll milling) to pulverize recycled plastic particles and functional fillers of varying sizes into uniform micron-sized particles (e.g., 50-100 μm). Physical homogeneity is then achieved through dynamic spreading and other methods to eliminate stratification caused by differences in density and morphology. Subsequently, in the modification stage, anti-aging agents, toughening agents, compatibilizers, and other additives are precisely added using a high-precision weighing system (e.g., ±0.5%). Within a high-temperature (e.g., 180-220°C) melting chamber, efficient shearing, kneading, and dispersing components (such as scraper cleaning and circulating crushing) ensure a material melt rate of over 95%, achieving extremely high dispersion of additives in the plastic matrix (e.g., 98%). This repairs and enhances the strength, impact toughness, and weather resistance of the recycled plastic, making its performance comparable to or even surpassing that of virgin materials.

[0004] However, existing technologies have significant shortcomings in achieving the aforementioned ideal process. For example, Chinese utility model patent announcement number "CN220614577U" discloses a mixing device for processing plastic granules. This device achieves material mixing through the reciprocating oscillation and rotation of the mixing tank and the rotation of the internal stirring shaft, claiming to improve mixing speed and efficiency.

[0005] While the aforementioned utility model can effectively mix the added raw materials, thereby improving the processing speed and efficiency and reducing the processing time, the stirring shaft will wear down during long-term operation due to friction and collision with materials such as plastic granules and additives. It may also be damaged by factors such as corrosion and high temperatures. Once a malfunction occurs, it is difficult for maintenance personnel to perform targeted repairs or replacements. They can only carry out overall maintenance of the entire mixing system or even the device, which not only increases the difficulty of maintenance but also leads to incomplete maintenance due to limited operating space, shortening the overall service life of the equipment. Moreover, the wear or damage to the stirring shaft will directly affect the mixing effect of the materials. After the performance deteriorates, it will lead to uneven mixing of plastic granules and additives, resulting in unstable performance of the final automotive parts plastic granules.

[0006] To address these issues, we propose a premixing and modification device for recycled plastic granules from automotive parts. Summary of the Invention

[0007] The purpose of this invention is to provide a premixing and modification device for recycled plastic granules from automotive parts, in order to solve the problem mentioned in the background art that the stirring shaft will wear out due to friction and collision with plastic granules, additives and other materials during long-term operation, and will also be damaged due to factors such as corrosion and high temperature. Once a failure occurs, it is difficult for maintenance personnel to repair or replace it in a targeted manner, and they can only carry out overall maintenance of the entire mixing system or even the device, which not only increases the difficulty of maintenance, but also leads to incomplete maintenance due to limited operating space.

[0008] To achieve the above objectives, the present invention provides a premixing and modification device for recycled plastic granules from automotive parts, comprising a base, a crushing box fixedly connected to the top of the base via a first support column, a crushing component installed inside the crushing box, a mixing cylinder fixedly connected to the top of the base, a top cover installed on the top of the mixing cylinder, lifting components symmetrically installed on the outer side wall of the mixing cylinder, a lifting seat installed on the top of the mixing cylinder via the lifting components, an agitating component installed on the top of the lifting seat, a drive shaft symmetrically rotatably connected to the bottom of the lifting seat, and a stirring roller threadedly connected to the bottom of the drive shaft via an installation component; The mounting assembly includes a rotating column, a second drive gear, a second driven gear, a first threaded hole, a threaded post, a limit block, a connecting post, and a rotating ring. A first mounting base is fixedly connected to the bottom of the drive shaft. A rotating column is symmetrically rotatably connected to the top of the first mounting base. The top of the rotating column has a first threaded hole, inside which a threaded post is threaded. A limit block is fixedly connected to the top of the threaded post. A second driven gear is fixedly sleeved on the outer wall of the rotating column. A second drive gear is rotatably sleeved on the outer side of the drive shaft. A connecting post is symmetrically fixedly connected to the top of the second drive gear. A rotating ring is rotatably sleeved on the outer side of the drive shaft. The top of the connecting post is fixedly connected to the bottom of the rotating ring. The diameter of the second drive gear is larger than the diameter of the second driven gear. The driving gear meshes with the second driven gear, and a second mounting base is fixedly connected to the top of the mixing roller. The top of the second mounting base has symmetrically opened second threaded holes, and the threaded post and the second threaded hole are threadedly connected. This allows maintenance personnel to quickly locate the faulty part and replace the damaged mixing roller separately without complicated disassembly of the entire device. This significantly shortens maintenance time, reduces maintenance difficulty, ensures that the equipment can be quickly restored to normal operation, reduces the impact of downtime on production plans, and allows for flexible switching of mixing rollers suitable for different formulas or processes. This improves mixing efficiency and uniformity, reduces material mixing time, increases single-batch production efficiency, and meets the diversified and mass production needs of automotive parts.

[0009] A fixing ring is fixedly fitted on the outer wall of the mixing cylinder. A second support column is symmetrically fixedly connected to the bottom of the fixing ring. The second support column is fixedly connected to the top of the base. The fixing ring is fitted on the outer wall of the mixing cylinder and, together with the symmetrically distributed second support columns, is connected to the base to form a stable triangular support structure.

[0010] In a further embodiment, the agitation assembly includes a third drive motor, a first drive gear, and a first driven gear. The third drive motor is mounted on the top of the lifting seat, and the first drive gear is rotatably connected to the top of the lifting seat. The output end of the third drive motor is fixedly connected to the first drive gear. The first driven gear is symmetrically rotatably connected to the top of the lifting seat. The top of the transmission shaft is fixedly connected to the bottom of the first driven gear. The diameter of the first driven gear is larger than the diameter of the first drive gear. The first drive gear and the first driven gear mesh with each other. The third drive motor drives the first drive gear to mesh with the larger diameter first driven gear, which can achieve efficient and stable transmission. The high speed of the stirring roller is achieved with the low speed of the motor. The structure is compact and symmetrical, easy to maintain, and can accurately adjust the speed to adapt to different mixing needs, ensuring the mixing efficiency and uniformity of plastic particles for automotive parts.

[0011] In a further embodiment, the lifting assembly includes a second drive motor, a lead screw, a guide rod, a lifting plate, and a connecting rod. A fixed seat is symmetrically fixedly connected to the outer wall of the mixing cylinder. A lead screw and a guide rod are rotatably connected between the fixed seats. The second drive motor is mounted on the top of the fixed seat, and its output end is fixedly connected to the lead screw. Lifting plates are fitted onto the outer sides of both the lead screw and the guide rod. A connecting rod is symmetrically fixedly connected to the top of the lifting plate, and the top of the connecting rod is fixedly connected to the bottom of the lifting seat. The lead screw and the lifting plate are threaded together, and the guide rod and the lifting plate are slidably connected. The contact position and depth between the stirring roller and the material can be adjusted as needed. When processing high-viscosity materials or requiring enhanced mixing, the stirring roller can be lowered to increase the force on the material. When processing materials with good flowability, the stirring roller can be appropriately raised to avoid excessive mixing that could lead to energy waste and material damage, thus improving the equipment's adaptability to diverse production needs. Furthermore, the lifting of the stirring roller can change the movement trajectory and mixing mode of the material within the mixing chamber, ensuring that the additives and plastic particles are fully and uniformly mixed.

[0012] In a further embodiment, guide grooves are symmetrically provided on the outer wall of the mixing cylinder, and guide blocks are symmetrically fixedly connected to the lifting plate on the side near the mixing cylinder. The guide blocks and guide grooves are slidably connected. The guide grooves on the outer side of the mixing cylinder and the guide blocks of the lifting plate slide together, which can accurately limit the movement trajectory of the lifting plate, avoid shaking and deviation when the mixing cylinder is raised and lowered, and ensure the stable contact position between the stirring roller and the material. At the same time, the guide structure is wear-resistant and impact-resistant, can adapt to frequent lifting and lowering requirements, and improve the reliability of the device operation and the uniformity of mixing.

[0013] In a further embodiment, the crushing assembly includes a first drive motor, crushing rollers, a feeding valve, and a feeding pipe. The crushing rollers are symmetrically rotatably connected inside the crushing box. The first drive motor is symmetrically installed on one side of the crushing box, and its output end is fixedly connected to the crushing rollers. The feeding pipe is fixedly connected to the bottom of the crushing box, and its other end is fixedly connected to the top cover. The inside of the crushing box is connected to the inside of the mixing cylinder through the feeding pipe. A feeding valve is installed on the outside of the feeding pipe. The crushing rollers are driven by the symmetrical first drive motors to crush the material. The material is fed through the feeding pipe and the feeding valve, which controls the feeding. This can efficiently crush plastic particles to a uniform particle size. The connection with the mixing cylinder realizes the connection between the crushing and mixing processes. The feeding amount is precisely controlled, ensuring the uniformity of subsequent mixing and the continuity of production. The top of the crushing box is rotatably mounted with a cover plate, and a protruding plate is extended to the side of the cover plate. A lifting member is connected to the lifting seat on the same side as the protruding plate. The lifting component includes an integrally connected horizontal part and a vertical part. The other end of the vertical part extends to the lower side of the convex plate and is used to lift the convex plate when the lifting seat is raised and lowered, so as to open or close the cover plate. A limiting groove is also provided on the side of the vertical part. A pressure block is slidably connected in the limiting groove. A spring is provided above the pressure block, and the other end of the spring abuts against the inner top of the limiting groove. The top of the first support column is provided with a support block for fixing the crushing box. The support block is provided with a control switch for controlling the start and stop of the first drive motor. When the pressure block moves down, it is used to squeeze the control switch.

[0014] In a further embodiment, one of the drive shafts is symmetrically provided with protruding rods, which are located at the upper end of the drive shaft so that the protruding rods do not affect the downward movement of the drive shaft. The outer surface of the feed tube is provided with a spring plate that matches the protruding rod. When the protruding rod rotates, it collides with the spring plate, causing the feed tube to vibrate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: Firstly, in this invention, the mixing roller, together with the second mounting base, is combined with the first mounting base at the bottom of the drive shaft. Rotating the rotating ring controls the connecting column to drive the second drive gear to rotate, which in turn drives the second driven gear to rotate, thus causing the rotating column to rotate. Simultaneously, the first threaded hole and the threaded column engage in threaded transmission, controlling the threaded column to advance. The threaded column is then threadedly connected to the second threaded hole on the second mounting base, completing the installation of the mixing roller. This allows maintenance personnel to quickly locate faulty components without complex disassembly of the entire device, enabling the replacement of the damaged mixing roller individually. This significantly shortens maintenance time, reduces maintenance difficulty, ensures the equipment can quickly return to normal operation, and minimizes the impact of downtime on production plans. Furthermore, it allows for flexible switching between mixing rollers suitable for different formulas or processes, thereby improving mixing efficiency and uniformity, reducing material mixing time, and increasing single-batch production efficiency, meeting the diverse and mass production needs of automotive parts. Secondly, in this invention, the second drive motor is started to control the lead screw to rotate. When the lead screw rotates, it engages with the lifting plate through a threaded transmission, thereby controlling the lifting plate to rise and fall. At the same time, the lifting plate drives the lifting seat to rise and fall through the connecting rod. Simultaneously, the lifting seat drives the stirring component, the transmission shaft, and the stirring roller to rise and fall. At the same time, the third drive motor is started to control the first drive gear to drive the first driven gear to rotate, thereby controlling the stirring roller to rotate. This completes the raising and lowering of the stirring roller during rotation. The contact position and depth between the stirring roller and the material can be adjusted as needed. When processing high-viscosity materials or when a stronger stirring effect is required, the stirring roller can be lowered to increase the force on the material. When processing materials with good fluidity, the stirring roller can be appropriately raised to avoid excessive stirring that would waste energy and damage the material. This improves the adaptability of the equipment to diverse production needs. Moreover, the raising and lowering of the stirring roller can change the movement trajectory and mixing mode of the material in the mixing chamber, ensuring that the additives and plastic particles are fully and uniformly mixed.

[0016] Thirdly, this invention achieves a high degree of automation and inherent safety in the equipment, and significantly improves mixing uniformity. By setting up a lifting assembly to drive the lifting seat to move up and down, on the one hand, the lifting element on the lifting seat can automatically open the cover of the crushing box when it moves upward, and automatically close it when it moves downward, eliminating the tedious operation of manually opening and closing the cover; on the other hand, and more importantly, after the cover is closed, the lifting seat continues to move downward, and through the pressure block and spring structure on the lifting element, it reliably squeezes the control switch, thereby starting the first drive motor. This mechanical safety interlock design of "close the cover first, then start" fundamentally eliminates the safety hazard of starting the crusher due to the cover not being closed.

[0017] Fourth, the present invention features a protruding rod at the upper end of the drive shaft, which engages with a spring plate on the feeding tube. Only when the lifting seat moves upward to perform feeding operations will the rotating protruding rod periodically collide with the spring plate, applying high-frequency vibration to the feeding tube, thereby achieving on-demand assisted feeding and ensuring smooth material conveying. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ; Figure 4 This is a partial three-dimensional structural diagram of the present invention; Figure 5 In this invention Figure 4 Enlarged view of part A; Figure 6 This is a schematic diagram of the three-dimensional structure on the other side of the present invention; Figure 7 In this invention Figure 6 Enlarged view of part B; Figure 8 This is a partial bottom-view three-dimensional structural diagram of the present invention; Figure 9 This is a partial cross-sectional three-dimensional structural schematic diagram of the present invention; Figure 10 In this invention Figure 9 Enlarged view of part C; Figure 11 This is a schematic diagram of the three-dimensional structure of the stirring roller in this invention; Figure 12 This is a schematic diagram of the spring sheet structure in this invention; Figure 13 This is a schematic diagram of the lifting component structure in this invention; Figure 14This is a schematic diagram of the limiting slide structure in this invention.

[0019] In the diagram: 1. Base; 2. First support column; 3. Crushing box; 4. Crushing assembly; 41. First drive motor; 42. Crushing roller; 43. Feeding valve; 44. Feeding pipe; 45. Cover plate; 46. Protruding plate; 47. Lifting component; 471. Horizontal part; 472. Vertical part; 4721. Limiting groove; 4722. Pressure block; 4723. Spring; 48. Control switch; 5. Mixing cylinder; 6. Fixing ring; 7. Second support column; 8. Top cover; 9. Fixed seat; 10. Lifting seat; 11. Lifting assembly; 111. Second drive motor; 112. Lead screw; 113. Guide rod; 14. Lifting plate; 115. Connecting rod; 12. Guide block; 13. Guide groove; 14. Agitator assembly; 141. Third drive motor; 142. First drive gear; 143. First driven gear; 15. Transmission shaft; 16. First mounting base; 17. Second mounting base; 18. Agitator roller; 19. Mounting assembly; 191. Rotating column; 192. Second drive gear; 193. Second driven gear; 194. First threaded hole; 195. Threaded column; 196. Limiting block; 197. Connecting column; 198. Rotating ring; 20. Second threaded hole; 21. Protruding rod; 22. Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figures 1-8 In this embodiment of the invention, a base 1 is provided, and a crushing box 3 is fixedly connected to the top of the base 1 via a first support column 2. A crushing component 4 is installed inside the crushing box 3. A mixing cylinder 5 is fixedly connected to the top of the base 1. A top cover 8 is installed on the top of the mixing cylinder 5. A lifting component 11 is symmetrically installed on the outer wall of the mixing cylinder 5. A lifting seat 10 is installed on the top of the mixing cylinder 5 via the lifting component 11. An agitation component 14 is installed on the top of the lifting seat 10. A drive shaft 15 is symmetrically rotatably connected to the bottom of the lifting seat 10. A stirring roller 18 is threadedly connected to the bottom of the drive shaft 15 via an installation component 19. Mounting assembly 19 includes a rotating column 191, a second drive gear 192, a second driven gear 193, a first threaded hole 194, a threaded column 195, a limiting block 196, a connecting column 197, and a rotating ring 198. A first mounting base 16 is fixedly connected to the bottom of the drive shaft 15. The rotating column 191 is symmetrically rotatably connected to the top of the first mounting base 16. A first threaded hole 194 is opened at the top of the rotating column 191, and a threaded column 195 is threaded into the first threaded hole 194. A limiting block 196 is fixedly connected to the top of the threaded column 195. A second driven gear 193 is fixedly sleeved on the outer wall of the rotating column 191. A second drive gear 192 is rotatably sleeved on the outer side of the drive shaft 15. A connecting column 197 is symmetrically fixedly connected to the top of the second drive gear 192. A rotating ring 198 is rotatably sleeved on the outer side of the drive shaft 15. The top of the connecting column 197 is fixedly connected to the bottom of the rotating ring 198. The diameter of the drive gear 192 is larger than the diameter of the second driven gear 193. The second drive gear 192 and the second driven gear 193 mesh with each other. The top of the stirring roller 18 is fixedly connected to the second mounting base 17. The top of the second mounting base 17 is symmetrically provided with second threaded holes 20. The threaded column 195 is threadedly connected to the second threaded hole 20. The stirring roller 18 together with the second mounting base 17 is combined with the first mounting base 16 at the bottom of the transmission shaft 15. The rotating ring 198 is rotated, and the control connecting column 197 drives the second drive gear 192 to rotate. The second drive gear 192 drives the second driven gear 193 to rotate, thereby causing the rotating column 191 to rotate. At the same time, the first threaded hole 194 and the threaded column 195 are threadedly driven, thereby controlling the threaded column 195 to move forward. The threaded column 195 is threadedly connected to the second threaded hole 20 on the second mounting base 17, thus completing the installation of the stirring roller 18.

[0022] Please see Figure 1 A fixing ring 6 is fixedly sleeved on the outer wall of the mixing cylinder 5. A second support column 7 is symmetrically fixedly connected to the bottom of the fixing ring 6. The second support column 7 is fixedly connected to the top of the base 1. The fixing ring 6 is sleeved on the outer wall of the mixing cylinder 5 and, together with the symmetrically distributed second support columns 7, is connected to the base 1 to form a stable triangular support structure.

[0023] Please see Figure 4The stirring assembly 14 includes a third drive motor 141, a first drive gear 142, and a first driven gear 143. The third drive motor 141 is mounted on the top of the lifting seat 10, and the first drive gear 142 is rotatably connected to the top of the lifting seat 10. The output end of the third drive motor 141 is fixedly connected to the first drive gear 142. The first driven gear 143 is symmetrically rotatably connected to the top of the lifting seat 10. The top end of the transmission shaft 15 is fixedly connected to the bottom of the first driven gear 143. The diameter of the first driven gear 143 is larger than the diameter of the first drive gear 142. The first drive gear 142 and the first driven gear 143 mesh with each other. When the third drive motor 141 is started, the first drive gear 142 is controlled to drive the first driven gear 143 to rotate. The first driven gear 143 drives the transmission shaft 15 to rotate, thereby causing the transmission shaft 15 to drive the stirring roller 18 to rotate.

[0024] Please see Figures 2-3 The lifting assembly 11 includes a second drive motor 111, a lead screw 112, a guide rod 113, a lifting plate 114, and a connecting rod 115. A fixed base 9 is symmetrically fixedly connected to the outer wall of the mixing cylinder 5. A lead screw 112 is rotatably connected between the fixed bases 9, and a guide rod 113 is fixedly connected between them. The second drive motor 111 is mounted on the top of the fixed base 9. The output end of the second drive motor 111 is fixedly connected to the lead screw 112. Lifting plates 114 are sleeved on the outer sides of both the lead screw 112 and the guide rod 113. Connecting rods 115 are symmetrically fixedly connected to the top of the lifting plates 114. 15. The top end of the connecting rod 115 is fixedly connected to the bottom of the lifting seat 10. The lead screw 112 is threadedly connected to the lifting plate 114, and the guide rod 113 is slidably connected to the lifting plate 114. The second drive motor 111 is started to control the lead screw 112 to rotate. When the lead screw 112 rotates, it performs threaded transmission with the lifting plate 114, thereby controlling the lifting plate 114 to rise and fall. At the same time, the lifting plate 114 drives the lifting seat 10 to rise and fall through the connecting rod 115. Meanwhile, the lifting seat 10 drives the stirring assembly 14, the transmission shaft 15 and the stirring roller 18 to rise and fall.

[0025] Please see Figure 2 The outer wall of the mixing cylinder 5 is symmetrically provided with guide grooves 13. The lifting plate 114 is symmetrically fixedly connected with guide blocks 12 on the side near the mixing cylinder 5. The guide blocks 12 and the guide grooves 13 are slidably connected. When the lifting plate 114 is raised or lowered, the lifting plate 114 drives the guide blocks 12 to slide inside the guide grooves 13.

[0026] Please see Figures 1-3The crushing assembly 4 includes a first drive motor 41, a crushing roller 42, a feeding valve 43, and a feeding pipe 44. The crushing roller 42 is symmetrically rotatably connected inside the crushing box 3. The first drive motor 41 is symmetrically installed on one side of the crushing box 3. The output end of the first drive motor 41 is fixedly connected to the crushing roller 42. The feeding pipe 44 is fixedly connected to the bottom of the crushing box 3. The other end of the feeding pipe 44 is fixedly connected to the top cover 8. The inside of the crushing box 3 is connected to the inside of the mixing cylinder 5 through the feeding pipe 44. The feeding valve 43 is installed on the outside of the feeding pipe 44. The recycled plastic particles, fillers, and solid additives are put into the crushing box 3. The first drive motor 41 is started to control the crushing roller 42 to rotate. The crushing roller 42 crushes the recycled plastic particles, fillers, and solid additives. Then the feeding valve 43 is started to let the crushed material enter the inside of the mixing cylinder 5 through the feeding pipe 44.

[0027] The working principle of this invention is as follows: First, the stirring roller 18, together with the second mounting base 17, is combined with the first mounting base 16 at the bottom of the transmission shaft 15. The rotating ring 198 is rotated, controlling the connecting column 197 to drive the second drive gear 192 to rotate. The second drive gear 192 drives the second driven gear 193 to rotate, thereby causing the rotating column 191 to rotate. Simultaneously, the first threaded hole 194 and the threaded column 195 engage in threaded transmission, thereby controlling the threaded column 195 to move forward. The threaded column 195 is threadedly connected to the second threaded hole 20 on the second mounting base 17, completing the installation of the stirring roller 18. The recycled plastic granules, fillers, and solid additives are then placed into the crushing box 3. The first drive motor 41 is started, controlling the crushing roller 42 to rotate and crush the materials. Roller 42 crushes recycled plastic granules, fillers, and solid additives. Then, feed valve 43 is activated to feed the crushed material into mixing drum 5 through feed pipe 44. Second drive motor 111 is activated to control lead screw 112 to rotate. When lead screw 112 rotates, it engages with lifting plate 114 via threaded transmission, thereby controlling the lifting plate 114 to rise and fall. At the same time, lifting plate 114 drives lifting seat 10 to rise and fall through connecting rod 115. Simultaneously, lifting seat 10 drives stirring assembly 14, drive shaft 15, and stirring roller 18 to rise and fall. At the same time, third drive motor 141 is activated to control first drive gear 142 to drive first driven gear 143 to rotate, thereby controlling stirring roller 18 to rotate, completing the rising and falling of stirring roller 18 during rotation. This invention enables maintenance personnel to quickly locate faulty components and replace damaged mixing rollers 18 individually without complex disassembly of the entire device. This significantly shortens maintenance time, reduces maintenance difficulty, ensures that the equipment can quickly return to normal operation, and minimizes the impact of downtime on production plans. Furthermore, it allows for flexible switching between mixing rollers 18 suitable for different formulas or processes, thereby improving mixing efficiency and uniformity, reducing material mixing time, increasing single-batch production efficiency, and meeting the diversified and mass production needs of automotive parts.

[0028] To improve the automation level and operational safety of the present invention, an embodiment of the present invention designs a linkage mechanism between the top of the crushing box 3 and the lifting seat 10. This mechanism can not only realize the automatic opening and closing of the cover plate 45 of the crushing box 3, but also construct a safety interlock logic of "closing the cover first and then starting".

[0029] Specifically, a cover plate 45 is rotatably mounted on the top of the crushing box 3 via a pivot or other means, for material feeding and sealing of the box. To coordinate with the lifting mechanism, a protruding plate 46 is integrally formed or fixedly connected to the side of the cover plate 45, serving as a force-bearing point for the lever action. Correspondingly, a lifting member 47 is fixedly connected to the side of the lifting seat 10 facing the protruding plate 46.

[0030] The lifting member 47 is preferably L-shaped or a similar irregular structure, comprising a horizontal portion 471 and a vertical portion 472 that are substantially perpendicular to each other. The horizontal portion 471 is firmly connected to the side wall of the lifting seat 10, ensuring that the lifting member 47 can move vertically and precisely in sync with the lifting seat 10. The vertical portion 472 extends downward from the far end of the horizontal portion 471, with its lower end positioned directly below the protruding plate 46. With this configuration, when the lifting seat 10 is driven upward by the lifting assembly 11, the vertical portion 472 of the lifting member 47 abuts against and lifts the protruding plate 46 from bottom to top, driving the cover plate 45 to rotate and open around its axis via a lever principle, thereby automatically opening the feeding port for convenient addition of recycled plastic granules, fillers, and other materials. Conversely, when the lifting seat 10 descends, the vertical portion 472 disengages from the support of the protruding plate 46, and the cover plate 45 automatically falls back and closes under its own weight, achieving automatic closure of the cover plate.

[0031] More importantly, this invention further designs a first drive motor 41 start-up control mechanism that is linked to the closed state of the cover plate 45. Specifically, a limiting groove 4721 is formed along the length of the side wall of the vertical part 472. Inside the limiting groove 4721, a pressing block 4722 is slidably accommodated. To impart elastic potential energy to the pressing block 4722 for downward pressing, an elastic element is provided above it. In this embodiment, a compression spring 4723 is preferred. One end of the spring 4723 abuts against the top surface of the pressing block 4722, and the other end abuts against the inner top wall of the limiting groove 4721. At the top of the first support column 2, i.e., on the support block used to fix the crushing box 3, a control switch 48, such as a limit switch, is installed to control the start and stop of the first drive motor 41. The position of the control switch 48 is precisely set, exactly on the downward movement path of the pressing block 4722.

[0032] The working process is as follows: When the lifting platform 10 descends from its high position, the descent of the vertical part 472 first causes the cover plate 45 to close completely. Afterward, the lifting platform 10 continues to descend a short preset distance. At this point, the lower end face of the pressure block 4722 begins to contact the triggering component of the control switch 48. As the lifting platform 10 continues to descend, due to the upward support resistance provided by the control switch 48, the pressure block 4722 slides upward relative to the vertical part 472 within the limiting groove 4721, thereby continuously compressing the spring 4723. The elastic potential energy stored in the compressed spring 4723 is converted into a continuously increasing downward pressure on the pressure block 4722. When this pressure reaches the triggering threshold of the control switch 48, the switch is reliably pressed down and the circuit is connected, thereby starting the first drive motor 41 to begin crushing the material inside the box. Preferably, after the control switch 48 is triggered, the pressure block 4722 can still move down a small distance with the lifting seat 10, so that the switch can be continuously and stably pressed, ensuring the continuity and reliability of the crushing operation.

[0033] This invention realizes an automated and safe process of "opening the lid when it is raised, closing the lid when it is lowered, and opening the lid when it is tightly closed", which greatly simplifies manual operation and fundamentally eliminates the safety hazards such as material splashing and dust pollution caused by starting the crusher due to forgetting to close the lid.

[0034] To address issues such as adhesion, bridging, and blockage that may occur when fine powdered materials pass through the feeding pipe 44 due to electrostatic adsorption, humidity, or the material's own viscosity, and to ensure that the material can smoothly and efficiently enter the mixing cylinder 5, this embodiment of the invention also includes a triggered auxiliary vibration feeding device.

[0035] The device relies on the rotational movement of the drive shaft 15. Specifically, radially extending protruding rods 21 are symmetrically fixed to the outer peripheral wall of one of the drive shafts 15. The protruding rods 21 are positioned in the upper region of the drive shaft 15. The purpose of this position is twofold: first, to allow them to engage with the spring plate 22 when the lifting seat 10 is in a high position; second, to ensure that when the drive shaft 15 descends with the lifting seat 10 into the mixing cylinder 5 for stirring, the protruding rods 21 will not interfere with the inner wall of the mixing cylinder 5 or other components, thus not affecting the normal operation of the stirring function.

[0036] Matching the protruding rod 21, at least one spring piece 22 is fixedly installed on the outer surface of the feeding tube 44. The spring piece 22 is preferably a metal sheet or a polymer material sheet with good elastic memory and fatigue resistance. One end of the spring piece 22 is fixed to the wall of the feeding tube 44, and the other free end extends naturally toward the drive shaft 15. Its position is exactly able to intersect with the movement trajectory of the rotating protruding rod 21.

[0037] The device does not operate continuously during equipment operation, but is only activated during the "feeding" phase when it is most needed.

[0038] The specific working principle is as follows: only when the lifting seat 10 is driven by the lifting component 11 and moves to the uppermost position of its stroke, the cover plate 45 of the crushing box 3 is opened by the lifting component 47, and the equipment is in the condition of preparing to feed or feeding material downward through the feeding pipe 44. At this time, the protruding rod 21 at the upper end of the transmission shaft 15 matches the spring piece 22 on the feeding pipe 44 in height.

[0039] In this specific state, when the agitator 14 is activated and the third drive motor 141 drives the transmission shaft 15 to rotate, the protruding rod 21 at its upper end will periodically and rapidly collide with and deflect the free end of the spring 22 as the shaft rotates. Each collision causes the spring 22 to undergo instantaneous elastic deformation and quickly rebounds after the collision. This rapid "impact-rebound" process effectively transmits high-frequency mechanical impact force to the entire feeding pipe 44, causing the feeding pipe 44 to vibrate at a small amplitude but high frequency. This effectively breaks down the static friction between powder materials and the adhesion force to the pipe wall, ensuring that the material remains in a flowing state and slides smoothly, evenly, and without blockage into the mixing cylinder 5 below.

[0040] This invention not only reliably solves the technical problem of poor powder feeding, but also improves the efficiency and automation of material transfer, and enables the vibration function to be started on demand, avoiding unnecessary mechanical vibration, noise and energy consumption in stages such as mixing and stirring where feeding is not required.

Claims

1. A premixing and modification device for recycled plastic granules from automotive parts, characterized in that, Includes a base (1), a crushing component (4) is installed on the top of the base (1), a mixing cylinder (5) is fixedly connected to the top of the base (1), a top cover (8) is installed on the top of the mixing cylinder (5), a lifting component (11) is symmetrically installed on the outer side wall of the mixing cylinder (5), a lifting seat (10) is provided on the top of the mixing cylinder (5), an agitator (14) is installed on the top of the lifting seat (10), a drive shaft (15) is symmetrically rotatably connected to the bottom of the lifting seat (10), and a stirring roller (18) is threadedly connected to the bottom of the drive shaft (15) through an installation component (19). The mounting assembly (19) includes a rotating column (191), a second drive gear (192), a second driven gear (193), a first threaded hole (194), a threaded column (195), a limiting block (196), a connecting column (197), and a rotating ring (198). The bottom of the transmission shaft (15) is fixedly connected to a first mounting base (16). The top of the first mounting base (16) is symmetrically rotatably connected to the rotating column (191). The top of the rotating column (191) is provided with a first threaded hole (194). The threaded column (195) is threadedly connected inside the first threaded hole (194). The top of the threaded column (195) is fixedly connected to a limiting block (196). The outer wall of the rotating column (191) is fixedly sleeved with a second driven gear (193). The outer wall of the transmission shaft (15) is rotatably sleeved with a second drive gear (192). The top of the second drive gear (192) is fixedly connected to a rotating ring (198) through a connecting column (197). A fixing ring (6) is fixedly sleeved on the outer wall of the mixing cylinder (5), and a second support column (7) is symmetrically fixedly connected to the bottom of the fixing ring (6). The second support column (7) is fixedly connected to the top of the base (1). The crushing assembly (4) includes a first drive motor (41), a crushing roller (42), a feeding valve (43), and a feeding pipe (44). The top of the base (1) is fixedly connected to a crushing box (3) via a first support column (2). The crushing roller (42) is symmetrically rotated inside the crushing box (3). The first drive motor (41) is symmetrically installed on one side of the crushing box (3). The output end of the first drive motor (41) is fixedly connected to the crushing roller (42). The bottom of the crushing box (3) is fixedly connected to a feeding pipe (44). The other end of the feeding pipe (44) is fixedly connected to the top cover (8). The inside of the crushing box (3) is connected to the inside of the mixing cylinder (5) via the feeding pipe (44). The feeding valve (43) is installed on the outside of the feeding pipe (44). The top of the crushing box (3) is rotatably mounted with a cover plate (45), and a protruding plate (46) is extended to the side of the cover plate (45). The lifting seat (10) and the protruding plate (46) are connected to a lifting member (47) on the same side. The lifting member (47) includes an integrally connected horizontal part (471) and a vertical part (472). The other end of the vertical part (472) extends to the lower side of the protruding plate (46) and is used to lift the protruding plate (46) when the lifting seat (10) is raised or lowered, so as to open or close the cover plate (45). The side of the vertical part (472) is also provided with a limiting groove (4721). A pressure block (4722) is slidably connected in the limiting groove (4721). A spring (4723) is provided above the pressure block (4722). The other end of the spring (4723) abuts against the inner top of the limiting groove (4721). The top of the first support column (2) is provided with a support block for fixing the crushing box (3). The support block is provided with a control switch (48) for controlling the start and stop of the first drive motor (41). When the pressure block (4722) moves down, it is used to squeeze the control switch (48). When the pressure block (4722) contacts the control switch (48) and the lifting seat (10) continues to move down, the pressure block (4722) slides upward relative to the vertical part (472) in the limiting slide groove (4721), thereby compressing the spring (4723) and making the control switch (48) elastically pressed. One of the drive shafts (15) is symmetrically provided with a protruding rod (21). The protruding rod (21) is located at the upper end of the drive shaft (15) so that the protruding rod (21) does not affect the downward movement of the drive shaft (15). The outer surface of the feeding tube (44) is provided with a spring piece (22) that matches the protruding rod (21). When the protruding rod (21) rotates, it collides with the spring piece (22), causing the feeding tube (44) to vibrate.

2. The premixing and modification device for recycled plastic granules of automotive parts according to claim 1, characterized in that, The diameter of the second drive gear (192) is larger than the diameter of the second driven gear (193), and the second drive gear (192) and the second driven gear (193) mesh with each other.

3. The premixing and modification device for recycled plastic granules of automotive parts according to claim 1, characterized in that, The top of the stirring roller (18) is fixedly connected to a second mounting base (17), and the top of the second mounting base (17) is symmetrically provided with a second threaded hole (20), and the threaded post (195) and the second threaded hole (20) are threadedly connected.

4. The premixing and modification device for recycled plastic granules of automotive parts according to claim 1, characterized in that, The stirring assembly (14) includes a third drive motor (141), a first drive gear (142) and a first driven gear (143). The third drive motor (141) is mounted on the top of the lifting seat (10). The first drive gear (142) is rotatably connected to the top of the lifting seat (10). The output end of the third drive motor (141) is fixedly connected to the first drive gear (142). The first driven gear (143) is symmetrically rotatably connected to the top of the lifting seat (10). The top end of the transmission shaft (15) is fixedly connected to the bottom of the first driven gear (143).

5. The premixing and modification device for recycled plastic granules of automotive parts according to claim 4, characterized in that, The diameter of the first driven gear (143) is larger than the diameter of the first driving gear (142), and the first driving gear (142) meshes with the first driven gear (143).

6. The premixing and modification device for recycled plastic granules of automotive parts according to claim 1, characterized in that, The lifting assembly (11) includes a second drive motor (111), a lead screw (112), a guide rod (113), a lifting plate (114), and a connecting rod (115). A fixed seat (9) is symmetrically fixedly connected to the outer wall of the mixing cylinder (5). The lead screw (112) is rotatably connected to the fixed seat (9), and the guide rod (113) is fixedly connected to the fixed seat (9). The second drive motor (111) is installed on the top of the fixed seat (9). The output end of the second drive motor (111) is fixedly connected to the lead screw (112). The lifting plate (114) is sleeved on the outer side of both the lead screw (112) and the guide rod (113). The connecting rod (115) is symmetrically fixedly connected to the top of the lifting plate (114). The top end of the connecting rod (115) is fixedly connected to the bottom of the lifting seat (10).

7. The premixing and modification device for recycled plastic granules of automotive parts according to claim 6, characterized in that, The lead screw (112) is threadedly connected to the lifting plate (114), and the guide rod (113) is slidably connected to the lifting plate (114).

8. The premixing and modification device for recycled plastic granules of automotive parts according to claim 7, characterized in that, The mixing cylinder (5) has symmetrical guide grooves (13) on its outer side wall. The lifting plate (114) is symmetrically fixedly connected to a guide block (12) on the side near the mixing cylinder (5). The guide block (12) and the guide groove (13) are slidably connected.

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