A plastic granule injection molding equipment and injection molding method
By combining vibration and hot air mechanisms, and utilizing the eccentric rotation inside the rotating cylinder and the impact of the ball to generate vibrations of different magnitudes, the problems of air bubbles and uniformity in the melting stage of injection molding machines are solved. This achieves efficient air bubble elimination and uniform feeding, thereby improving the production efficiency and finished product quality of injection molding equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUBEI HUACHENG TECH
- Filing Date
- 2026-05-06
- Publication Date
- 2026-06-30
AI Technical Summary
Existing injection molding machines are prone to forming bubbles inside the finished product during the melting stage due to the moisture content of the raw materials, air trapped between particles, or gas generated by the decomposition of the melt. This also leads to increased viscosity of the molten plastic, causing it to stick to the screw, making cleaning difficult, interrupting the material supply, causing production delays, resulting in poor material uniformity and incomplete degassing of bubbles.
The system employs a combination of vibration and hot air mechanisms. Different vibrations are generated by the eccentric rotation and striking of balls inside the rotating cylinder. Combined with hot air preheating and drying, this eliminates air bubbles in the molten raw material, prevents plastic particles from bridging, and achieves global disturbance and uniform heating.
It effectively eliminates air bubbles in molten plastic, prevents the formation of air bubbles in the finished product, improves melting uniformity and feeding uniformity, reduces production interruptions, enhances venting, saves melting time, and reduces equipment space occupation.
Smart Images
Figure CN122299883A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of injection molding technology, and in particular to a plastic granule injection molding equipment and injection molding method. Background Technology
[0002] Currently, mainstream injection molding machines generally consist of a barrel, screw, heating components, injection mechanism, and mold. The plastic granules are melted by heating the barrel and pushing with the screw, and then injected into the mold cavity under high pressure. After cooling, they are shaped into plastic products. There are usually single-screw injection molding machines and twin-screw injection molding machines, which are widely used in precision parts, daily necessities, automotive parts and other fields.
[0003] Existing injection molding machines are prone to air bubbles forming inside the finished product during the melting stage due to factors such as water content in the raw materials, air trapped between particles, gas generation from melt decomposition, and uneven material feeding. Currently, common methods mainly involve using a vibrating motor at the bottom of the injection molding machine to eliminate air bubbles before injecting the molten raw material into the mold, as well as vacuum injection. However, the vibration mode is singular and the frequency is fixed, which can easily create vibration blind spots. This results in poor removal of micro-bubbles and bubbles in viscous melts, and incomplete venting. At the same time, the radiant heat generated mainly by external heating components can easily lead to uneven internal and external temperatures, which not only makes it easier for bubbles to form, but also increases the viscosity of the molten plastic, causing it to stick to the screw and making cleaning difficult. Furthermore, the raw material is prone to bridging due to accumulation and compression at the hopper or barrel inlet. When the fixed-frequency vibration is transmitted to the outlet, the amplitude is affected, making it difficult to break up the bridging. This not only leads to interruption of material supply and production jams, but also affects the uniformity of material feeding, further increasing the possibility of bubble formation. Summary of the Invention
[0004] In view of the problems existing in the prior art, the purpose of this invention is to provide a plastic granule injection molding equipment and injection molding method to solve the problems mentioned in the background art.
[0005] To solve the above problems, the present invention adopts the following technical solution: a plastic granule injection molding equipment, including a support frame, an injection molding mechanism fixedly connected to the upper end of the support frame, a vibration mechanism disposed inside the injection molding mechanism, and a hot air mechanism disposed at the lower end of the injection molding mechanism. The injection molding mechanism includes a housing fixedly connected to the left side of the upper end of the support frame, a drive chamber fixedly connected to the right end of the housing, screws rotatably connected to the front and rear sides of the interior of the housing, a slide table fixedly connected to the right end of each screw, and a drive assembly fixedly connected to the left side of the housing. The vibration mechanism includes two vibration components disposed inside the screws and a transmission component disposed inside the drive chamber. The hot air mechanism includes an industrial hot air blower fixedly connected to the left side of the support frame and two air collecting pipes to the right side of the vibration components. A diverter pipe is fixedly connected to the outer periphery of the left air outlet of the industrial hot air blower. Air blowing pipes are fixedly connected to the front and rear sides of the upper end of the diverter pipe, and a conduit is fixedly connected to the upper end of each air collecting pipe.
[0006] Preferably, the front and rear screws are meshed with each other, the front and rear gears are meshed with each other, a feed bin is fixedly connected to the upper right opening of the housing, and resistance heating coils are evenly distributed on the left outer periphery of the housing.
[0007] Preferably, the drive assembly includes a geared motor at the upper end of the bracket and a hydraulic cylinder at the upper right end of the bracket. A drive shaft is rotatably connected to the lower inner end of the drive compartment. A gear is fixedly connected to the left end of the drive shaft, and a pulley is fixedly connected to the right end of the drive shaft. The pulley is connected to a second pulley via a transmission belt. The second pulley is fixedly connected to the right output end of the geared motor. A slide is fixedly connected to the lower end of the drive compartment, and the right end of the drive compartment is fixedly connected to the left output end of the hydraulic cylinder.
[0008] Preferably, the second gear on the front side meshes with the first gear, and the lower end of the slide is slidably connected to the upper end of the bracket.
[0009] Preferably, the vibration assembly includes two rotating cylinders rotatably connected to the middle of the screw. The inner walls of each rotating cylinder have protrusions of different sizes. Each rotating cylinder has multiple air inlets at its left end. Each rotating cylinder has multiple air outlets on its right outer periphery. An eccentric seat is rotatably connected to the middle of the right end of each rotating cylinder. A rotating rod is fixedly connected to the left end of each eccentric seat. Springs are spirally distributed around the outer periphery of each rotating rod, and a striking ball is fixedly connected to the end of each spring furthest from the rotating rod.
[0010] Preferably, the left ends of the rotating rods are rotatably connected to the middle of the left end of the rotating cylinder, the left ends of the eccentric seats are rotatably connected to the front and rear openings on the left side of the drive compartment, and the left ends of the rotating cylinders are slidably connected to the front and rear openings on the left side of the housing.
[0011] Preferably, the transmission assembly includes a limiting platform located in the middle of the drive compartment, two gears rotatably connected to the left side of the drive compartment, and two pulleys fixedly connected to the right end of the eccentric seat. Each gear 3 has a gear 4 fixedly connected to its right end, and each gear 4 is meshed with a gear 8. A gearbox is fixedly connected to the upper end of the limiting platform. A gear 5 is fixedly connected to the left input end of the gearbox, and a gear 6 is fixedly connected to the right output end of the gearbox. The gear 6 is meshed with a gear 7. The front and rear pulleys 3 are connected by a transmission belt 2.
[0012] Preferably, all three gears mesh with the second gear, the middle part of each of the eight gears is fixedly connected to the right side of the outer periphery of the rotating cylinder, the right end of each of the rotating cylinders is rotatably connected to the front and rear openings of the limiting platform, and the right end of the rear eccentric seat is fixedly connected to the middle part of the seventh gear.
[0013] Preferably, the inner circumference of the air blowing pipe is rotatably connected to the outer circumference of the rotating cylinder, the upper end of the guide pipe is fixedly connected to the front and rear openings at the lower end of the feed hopper, the outer circumference of the right end of the eccentric seat is rotatably connected to the right end opening of the air collecting pipe, and the left end of the air collecting pipe is fixedly connected to the right end of the limiting platform.
[0014] A method for injection molding plastic granules, applied to the plastic granule injection molding equipment described above, includes the following steps: S1. Input the raw materials into the feeding hopper, start the hot air mechanism to preheat the rotating drum and screw, and use the tail air to disperse, preheat and dry the raw materials; S2. Start the geared motor to drive the screw to rotate and feed the material, and at the same time start the resistance heating coil to heat and melt the raw material; S3. When the screw rotates, it drives the vibration mechanism through gear two to eliminate air bubbles in the molten raw material. S4. Start the hydraulic cylinder to drive the screw to move back and forth for injection molding.
[0015] The plastic granule injection molding equipment and injection molding method provided by this invention have the following advantages: 1. By coordinating the injection molding mechanism and the vibration mechanism, air bubbles in the molten raw material are eliminated during the injection molding process by striking protrusions of different sizes with a ball, thus avoiding the presence of air bubbles in the finished product.
[0016] 2. Through the cooperation of the injection molding mechanism and the vibration mechanism, the position of the protrusion impacting the striking ball changes in real time, thereby generating vibrations of different amplitudes in real time. Due to the eccentric rotation of the rotating rod, the spring, in conjunction with the striking ball, generates a continuously changing oscillation amplitude. Simultaneously, the continuously changing position of the striking ball causes the vibration amplitude and direction generated by striking the protrusion to also continuously change. This further enables real-time modification of the magnitude and direction of the generated vibration amplitude, avoiding the vibration blind zone caused by vibration in a fixed position. It creates a global disturbance to the molten material inside the shell, which can break up air bubbles of different particle sizes inside the molten plastic in all directions, further improving the degassing and defoaming effect.
[0017] 3. Through the cooperation of the vibration mechanism and the hot air mechanism, not only is the rotating drum preheated, ensuring that the screw in contact with the rotating drum is also preheated, preventing the molten material from sticking to the screw surface due to temperature difference caused by the low screw temperature in the early stage of injection molding, but hot air is also simultaneously sent into the bottom of the feed hopper. This not only dries the plastic granules but also agitates them at the bottom of the feed hopper, preventing bridging and resulting in more uniform feeding. This makes it less likely for air bubbles to form during the melting stage, and the preheating of the plastic granules saves melting time, making the injection molding unit occupy less space.
[0018] 4. The coordination of the vibration mechanism and the hot air mechanism enables the gas flow rate to continuously change inside the rotating drum for preheating, forming a dynamic circulating heat exchange. Furthermore, the continuous eccentric rotation of the spring and striking ball driven by the rotating rod further agitates the airflow, enhancing the circulating heat exchange effect and avoiding preheating dead zones. This ensures more uniform preheating of the screw, preventing the molten material from sticking to the screw surface due to temperature differences. Simultaneously, as the air intake changes, the gas entering the feed hopper also changes continuously. This constantly changing airflow circulates through the material gaps, ensuring uniform heating and maintaining a loose state for the particles at the bottom of the feed hopper, effectively preventing bridging. Moreover, when the hot air forms a circulation inside the rotating drum, it blows the striking ball at the top of the spring, generating subtle swing amplitudes of varying sizes and directions, further increasing the randomness of the vibration amplitude and minimizing the probability of air bubbles in the raw material during injection molding. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 A front-view perspective schematic diagram of a plastic granule injection molding equipment and injection molding method provided in this application; Figure 2 A rear-view perspective schematic diagram of a plastic granule injection molding equipment and injection molding method provided in this application; Figure 3 This application provides a front-view exploded perspective view of a plastic granule injection molding equipment and injection molding method. Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 An exploded rear-view perspective view of a plastic granule injection molding equipment and injection method provided in this application; Figure 6 for Figure 5 Enlarged view at point B in the middle; Figure 7 A front view partially exploded cross-sectional perspective view of a plastic granule injection molding equipment and injection molding method provided in this application; Figure 8 for Figure 7 Enlarged view of point C.
[0021] In the diagram: 1. Injection molding mechanism; 11. Housing; 12. Feed hopper; 13. Resistance heating coil; 14. Screw; 15. Drive chamber; 16. Drive shaft; 17. Gear 1; 18. Pulley 1; 19. Transmission belt 1; 110. Pulley 2; 111. Gearbox; 112. Slide table; 113. Gear 2; 114. Hydraulic cylinder; 2. Vibration mechanism; 21. Gear 3; 22. Gear 4; 23. Gear 5; 24. Gearbox; 5. Limiting platform; 26. Gear 6; 27. Gear 7; 28. Eccentric seat; 29. Rotating cylinder; 210. Protrusion; 211. Air inlet; 212. Air outlet; 213. Rotating rod; 214. Spring; 215. Striking ball; 216. Pulley 3; 217. Transmission belt 2; 218. Gear 8; 3. Hot air mechanism; 31. Industrial hot air blower; 32. Diverter pipe; 33. Air blowing pipe; 34. Air collecting pipe; 35. Conduit pipe; 4. Support. Detailed Implementation
[0022] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.
[0023] like Figures 1-8 As shown, this embodiment proposes a plastic granule injection molding equipment, including a support 4. An injection molding mechanism 1 is fixedly connected to the upper end of the support 4. A vibration mechanism 2 is provided inside the injection molding mechanism 1. A hot air mechanism 3 is provided at the lower end of the injection molding mechanism 1. The injection molding mechanism 1 includes a housing 11 fixedly connected to the left side of the upper end of the support 4. A drive chamber 15 is fixedly connected to the right end of the housing 11. Screws 14 are rotatably connected to the front and rear sides of the interior of the housing 11. A slide table 112 is fixedly connected to the right end of each screw 14. A drive assembly is fixedly connected to the left side of the housing 11.
[0024] In this embodiment, the front and rear screws 14 mesh with each other, the front and rear gears 113 mesh with each other, the feed chamber 12 is fixedly connected to the upper right opening of the housing 11, and the resistance heating coils 13 are evenly distributed on the left outer periphery of the housing 11.
[0025] In this embodiment, the drive assembly includes a reduction motor 111 at the upper end of the bracket 4 and a hydraulic cylinder 114 at the upper right end of the bracket 4. The lower inner end of the drive chamber 15 is rotatably connected to a drive shaft 16. A gear 17 is fixedly connected to the left end of the drive shaft 16, and a pulley 18 is fixedly connected to the right end of the drive shaft 16. The pulley 18 is connected to a pulley 110 via a transmission belt 19. The pulley 110 is fixedly connected to the right output end of the reduction motor 111. A slide table 112 is fixedly connected to the lower end of the drive chamber 15, and the right end of the drive chamber 15 is fixedly connected to the left output end of the hydraulic cylinder 114.
[0026] In this embodiment, the front gear 113 meshes with the gear 17, and the lower end of the slide 112 is slidably connected to the upper end of the bracket 4.
[0027] Specifically, plastic granules are added into the feed hopper 12, the geared motor 111 is started, and the drive shaft 16 is driven to rotate through the pulley 110, the transmission belt 19, and the pulley 18. This drives the front gear 113 to rotate through the gear 17, and then drives the front and rear screws 14 to rotate through the engagement of the rear gear 113, thus conveying the plastic granules to the left. At the same time, the resistance heating coil 13 is started to heat the plastic granules to melt, and the hydraulic cylinder 114 is started to drive the screw 14 to move to the left through the drive chamber 15 for injection molding. After the injection molding is completed, the hydraulic cylinder 114 pulls back the drive chamber 15 and the screw 14 to prepare for the next injection molding.
[0028] In this embodiment, the vibration mechanism 2 includes two vibration components disposed inside the screw 14 and a transmission component disposed inside the drive chamber 15. The vibration components include two rotating cylinders 29 rotatably connected to the middle of the screw 14. The inner walls of the rotating cylinders 29 are distributed with protrusions 210 of different sizes. The left end of each rotating cylinder 29 is provided with multiple air inlets 211. The outer periphery of the right end of each rotating cylinder 29 is provided with multiple air outlets 212. The middle of the right end of each rotating cylinder 29 is rotatably connected to an eccentric seat 28. The left end of each eccentric seat 28 is fixedly connected to a rotating rod 213. Springs 214 are spirally distributed on the outer periphery of the rotating rod 213. The end of each spring 214 away from the rotating rod 213 is fixedly connected to a striking ball 215.
[0029] In this embodiment, the left end of the rotating rod 213 is rotatably connected to the middle of the left end of the rotating cylinder 29, the left end of the eccentric seat 28 is rotatably connected to the front and rear openings on the left side of the drive chamber 15, and the left end of the rotating cylinder 29 is slidably connected to the front and rear openings on the left side of the housing 11.
[0030] In this embodiment, the transmission assembly includes a limiting platform 25 disposed in the middle of the drive chamber 15, two gears 21 rotatably connected to the left side of the drive chamber 15, and two pulleys 216 fixedly connected to the right end of the eccentric seat 28. Gears 22 are fixedly connected to the right end of each gear 21, and gears 22 are meshed with gears 218. A gearbox 24 is fixedly connected to the upper end of the limiting platform 25. Gear 23 is fixedly connected to the left input end of the gearbox 24, and gear 26 is fixedly connected to the right output end of the gearbox 24. Gear 27 is meshed with gear 26. The front and rear pulleys 216 are connected by a transmission belt 217.
[0031] In this embodiment, gear 3 21 meshes with gear 2 113, the middle part of gear 8 218 is fixedly connected to the right side of the outer periphery of the rotating cylinder 29, the right end of the rotating cylinder 29 is rotatably connected to the front and rear openings of the limiting platform 25, and the right end of the rear eccentric seat 28 is fixedly connected to the middle part of gear 7 27.
[0032] Specifically, when gear 213 drives screw 14 to rotate, gears 321 and 42 rotate synchronously, which in turn drives gear 626 to rotate via gear 523 and gearbox 24. Gear 727 then drives the rear eccentric seat 28 to rotate. The front and rear pulleys 3216 and transmission belt 217 work together to drive the front eccentric seat 28 to rotate synchronously. This causes the rotating rods 213 on both sides to rotate eccentrically around the internal axis of the rotating cylinder 29. The spring 214 drives the striking ball 215 to continuously strike the protrusions 210 of different sizes inside the rotating cylinder 29, producing… Vibrations of varying magnitudes act on the screw 14, causing it to vibrate at different rates as it conveys molten material to the left. Small vibrations disturb the surface and fine gaps of the melt, causing tiny bubbles to gradually coalesce and rise. Medium vibrations break the viscous binding within the melt, pushing medium-sized bubbles towards the barrel's venting path. Large vibrations break the encapsulation of large bubbles, rapidly releasing the gas inside. Through the cooperation of the injection molding mechanism 1 and the vibration mechanism 2, the process of injection molding is achieved by striking the protrusions 210 of different sizes with the striking ball 215. Vibrations of varying magnitudes eliminate air bubbles in the molten raw material, preventing air bubbles from appearing in the finished product during injection molding. When gears 3 (21) and 4 (22) rotate, they synchronously drive gear 8 (218) to rotate, which in turn drives the rotating cylinder 29 to rotate in the opposite direction to the screw 14 inside the screw 14. This causes the position of the protrusion 210 inside the rotating cylinder 29 to continuously change, thus causing the striking ball 215 to continuously vibrate at the protrusion 210. Through the cooperation of the injection molding mechanism 1 and the vibration mechanism 2, the real-time change of the impact position between the protrusion 210 and the striking ball 215 is achieved, thereby ensuring that the product... The position of the vibration amplitude changes in real time, and due to the eccentric rotation of the rotating rod 213, the spring 214 and the striking ball 215 can produce a continuously changing swing amplitude. At the same time, the position of the striking ball 215 changes continuously, and the vibration amplitude and direction generated by the striking protrusion 210 also change continuously. This further realizes the real-time change of the magnitude and direction of the generated vibration amplitude, avoiding the situation of vibration blind zone caused by vibration in a fixed position. It forms a global disturbance to the molten material inside the shell 11, which can break up bubbles of different particle sizes inside the molten plastic in all directions, further improving the degassing and defoaming effect.
[0033] In this embodiment, the hot air mechanism 3 includes an industrial hot air blower 31 fixedly connected to the left side of the support bracket 4 and two air collection pipes 34 on the right side of the vibration assembly. A diversion pipe 32 is fixedly connected to the outer periphery of the left air outlet of the industrial hot air blower 31. Air blowing pipes 33 are fixedly connected to the front and rear sides of the upper end of the diversion pipe 32. A conduit 35 is fixedly connected to the upper end of each air collection pipe 34. The inner periphery of the air blowing pipe 33 is rotatably connected to the outer periphery of the rotating cylinder 29. The upper end of the conduit 35 is fixedly connected to the front and rear openings at the lower end of the feed hopper 12. The outer periphery of the right end of the eccentric seat 28 is rotatably connected to the right opening of the air collection pipe 34. The left end of the air collection pipe 34 is fixedly connected to the right end of the limiting platform 25.
[0034] Specifically, when injection molding begins, the industrial hot air blower 31 is activated, sending hot air into the interior of the rotating cylinder 29 through the distributor pipe 32, the air blowing pipe 33, and the air inlet 211 at the left end of the rotating cylinder 29. The hot air is then sent into the bottom of the feed hopper 12 through the air outlet 212, the air collecting pipe 34, and the conduit 35, preheating the rotating cylinder 29 and blowing air into the bottom of the feed hopper 12. Through the cooperation of the vibration mechanism 2 and the hot air mechanism 3, not only is the rotating cylinder 29 preheated, but the screw 14, which is in contact with the rotating cylinder 29, is also preheated, preventing the molten material from being damaged due to low screw 14 temperature during the early stages of injection molding. The plastic granules adhere to the surface of the screw 14, and hot air is simultaneously sent into the bottom of the feed hopper 12. This not only dries the plastic granules but also agitates them at the bottom of the feed hopper 12, preventing bridging and resulting in more uniform feeding. This reduces the likelihood of air bubbles forming during the melting stage and preheats the plastic granules, saving melting time and reducing the space required for the injection molding unit. When the rotating drum 29 rotates, it drives the air inlet 211 on the left side to rotate. Because the air inlet 211 is unevenly distributed on the rotating drum 29... The distribution of hot air is such that it can only enter the interior of the rotating cylinder 29 through the air inlet 211, which coincides with the air inlet at the lower end of the air blowing pipe 33. This causes the airflow inside the rotating cylinder 29 to change continuously. Through the cooperation of the vibration mechanism 2 and the hot air mechanism 3, the size of the preheated gas flow entering the rotating cylinder 29 changes continuously, forming a dynamic circulating heat exchange. Furthermore, because the rotating rod 213 drives the spring 214 and the striking ball 215 to rotate eccentrically, it further disturbs the airflow, thereby further improving the circulating heat exchange effect, avoiding preheating dead zones, and making the screw 14 more evenly preheated. The molten raw material will not stick to the surface of the screw 14 due to temperature difference. At the same time, as the air intake changes continuously, the gas entering the feed chamber 12 will also change continuously. The continuously changing airflow can circulate through the gaps between materials, so that the particles at the bottom of the feed chamber 12 are heated evenly and kept in a loose state, which can further effectively prevent bridging. Moreover, when the hot air forms a circulation inside the rotating cylinder 29, it can blow the striking ball 215 at the top of the spring 214 to produce a slight swing amplitude of different size and direction, further increasing the randomness of the vibration amplitude, so that the probability of the raw material containing air bubbles during injection molding is extremely low.
[0035] A method for injection molding plastic granules, applied to one of the aforementioned plastic granule injection molding machines, includes the following steps: S1. Input the raw materials into the feeding hopper 12, start the hot air mechanism 3 to preheat the rotating drum 29 and screw 14, and use the tail air to disperse, preheat and dry the raw materials. S2. Start the geared motor 111 to drive the screw 14 to rotate and feed the material, and at the same time start the resistance heating coil 13 to heat and melt the raw material; S3. When the screw 14 rotates, it drives the vibration mechanism 2 through gear 113 to eliminate air bubbles in the molten raw material. S4. Start the hydraulic cylinder 114 to drive the screw 14 to move back and forth for injection molding.
[0036] Working principle: Plastic granules are added into the feed hopper 12. The geared motor 111 is started, which drives the drive shaft 16 to rotate via pulley 110, transmission belt 19, and pulley 18. This drives the front gear 113 via gear 17, which in turn drives the front and rear screws 14 to rotate, conveying the plastic granules to the left. Simultaneously, the resistance heating coil 13 is activated to heat the plastic granules until they melt. The hydraulic cylinder 114 is also activated, which drives the screw 14 to move to the left via the drive chamber 15 for injection molding. After injection molding is completed, the hydraulic cylinder 114 pulls back the drive chamber 15 and the screw 14 to prepare for the next injection. When gear 113 drives the screw 14 to rotate, it simultaneously drives gear 21 and the front and rear screws 14 to rotate. The rotation of wheel 422 drives gear 626 via gear 523 and gearbox 24, which in turn drives gear 727 to rotate the rear eccentric seat 28. This, in turn, drives the front eccentric seat 28 to rotate synchronously via pulley 3216 and transmission belt 217. This causes the rotating rods 213 on both sides to rotate eccentrically around the internal axis of the rotating cylinder 29. Through spring 214, the striking ball 215 continuously strikes the protrusions 210 of different sizes inside the rotating cylinder 29, generating vibrations of varying magnitudes. These vibrations act on the screw 14, causing it to vibrate as it conveys molten material to the left. Small vibrations disturb the surface and fine gaps of the melt, causing tiny bubbles to gradually converge and rise. Medium vibrations... The vibration mechanism breaks the viscous confinement within the melt, propelling medium-sized bubbles towards the venting path in the barrel. Large-volume bubbles are broken up, rapidly releasing their internal gas. Through the coordination of the injection molding mechanism 1 and the vibration mechanism 2, bubbles in the molten material are eliminated during injection molding by the impact of the striking ball 215 against protrusions 210 of varying sizes, generating vibrations of different sizes. This prevents bubbles from being present in the finished product. When the front and rear gears 3 21 and 4 22 rotate, they synchronously drive the gear 8 218 to rotate, which in turn causes the rotating cylinder 29 to rotate in the opposite direction to the screw 14 inside the screw 14. This causes the position of the protrusions 210 inside the rotating cylinder 29 to continuously change, resulting in the striking ball 215 impacting the protrusions 210 and generating vibrations. The position of the protrusion 210 and the striking ball 215 are constantly changing. Through the cooperation of the injection molding mechanism 1 and the vibration mechanism 2, the position of the impact between the protrusion 210 and the striking ball 215 changes in real time, thereby causing the position of the vibration amplitude to change in real time. Furthermore, due to the eccentric rotation of the rotating rod 213, the spring 214 can work with the striking ball 215 to produce a continuously changing swing amplitude. At the same time, the position of the striking ball 215 is constantly changing, and the vibration amplitude and direction generated by the impact on the protrusion 210 will also continuously change. This further achieves real-time change of the magnitude and direction of the generated vibration amplitude, avoiding the vibration blind zone caused by vibration in a fixed position. It forms a global disturbance to the molten material inside the shell 11, which can break up bubbles of different particle sizes inside the molten plastic in all directions, further improving the degassing and defoaming effect.When injection molding begins, the industrial hot air blower 31 is activated, sending hot air into the interior of the rotating cylinder 29 through the distributor pipe 32, the air blowing pipe 33, and the air inlet 211 at the left end of the rotating cylinder 29. The hot air is then sent into the bottom of the feed hopper 12 through the air outlet 212, the air collecting pipe 34, and the conduit 35, preheating the rotating cylinder 29 and blowing air into the bottom of the feed hopper 12. Through the cooperation of the vibration mechanism 2 and the hot air mechanism 3, not only is the rotating cylinder 29 preheated, but the screw 14, which is in contact with the rotating cylinder 29, is also preheated, preventing the molten material from sticking together due to temperature differences caused by the low temperature of the screw 14 in the early stages of injection molding. On the surface of the screw 14, hot air is simultaneously fed into the bottom of the feed hopper 12, which not only dries the plastic granules but also agitates them at the bottom of the feed hopper 12, preventing bridging and thus achieving more uniform feeding. This reduces the likelihood of air bubbles forming during the melting stage and preheats the plastic granules, saving melting time and reducing the space required for the injection molding unit. When the rotating drum 29 rotates, it drives the air inlet 211 on the left side to rotate. Since the air inlet 211 is unevenly distributed on the rotating drum 29... Furthermore, the hot air can only enter the interior of the rotating cylinder 29 through the air inlet 211, which coincides with the air inlet at the lower end of the air blowing pipe 33. This causes the airflow inside the rotating cylinder 29 to change continuously. Through the cooperation of the vibration mechanism 2 and the hot air mechanism 3, the size of the preheated gas flow entering the rotating cylinder 29 changes continuously, forming a dynamic circulating heat exchange. Moreover, because the rotating rod 213 drives the spring 214 and the striking ball 215 to rotate eccentrically, it further disturbs the airflow, thereby further improving the circulating heat exchange effect, avoiding preheating dead zones, and ensuring that the screw 14 is preheated more evenly, thus further enhancing the melting process. The molten raw material will not stick to the surface of the screw 14 due to temperature differences. Simultaneously, as the air intake changes, the gas entering the feed hopper 12 also changes continuously. This constantly changing airflow circulates through the gaps in the material, ensuring that the particles at the bottom of the feed hopper 12 are heated evenly and remain loose, effectively preventing bridging. Furthermore, when hot air forms a circulation inside the rotating cylinder 29, it can blow the striking ball 215 at the upper end of the spring 214, generating subtle swing amplitudes of varying sizes and directions, further increasing the randomness of the vibration amplitude and resulting in an extremely low probability of air bubbles in the raw material during injection molding.
[0037] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.
Claims
1. A plastic pellet injection molding apparatus comprising a support (4), characterized in that, An injection molding mechanism (1) is fixedly connected to the upper end of the bracket (4). A vibration mechanism (2) is provided inside the injection molding mechanism (1). A hot air mechanism (3) is provided at the lower end of the injection molding mechanism (1). The injection molding mechanism (1) includes a housing (11) fixedly connected to the left side of the upper end of the bracket (4). A drive chamber (15) is fixedly connected to the right end of the housing (11). Screws (14) are rotatably connected to the front and rear sides of the interior of the housing (11). A slide table (112) is fixedly connected to the right end of each screw (14). The left side of the housing (11) is fixedly connected to the drive chamber (15). The vibration mechanism (2) is connected to a drive assembly. It includes two vibration assemblies inside the screw (14) and a transmission assembly inside the drive chamber (15). The hot air mechanism (3) includes an industrial hot air blower (31) fixedly connected to the left side of the support (4) and two air collection pipes (34) on the right side of the vibration assembly. A diversion pipe (32) is fixedly connected to the outer periphery of the left air outlet of the industrial hot air blower (31). Air blowing pipes (33) are fixedly connected to the front and rear sides of the upper end of the diversion pipe (32). A conduit (35) is fixedly connected to the upper end of the air collection pipe (34).
2. The plastic pellet injection molding apparatus according to claim 1, wherein, The front and rear screws (14) mesh with each other, the front and rear gears (113) mesh with each other, the feed bin (12) is fixedly connected to the upper right opening of the housing (11), and the resistance heating coils (13) are evenly distributed on the left outer periphery of the housing (11).
3. A plastic pellet injection molding apparatus according to claim 2, wherein The drive assembly includes a geared motor (111) at the upper end of the bracket (4) and a hydraulic cylinder (114) at the upper right end of the bracket (4). The lower inner end of the drive chamber (15) is rotatably connected to a drive shaft (16). The left end of the drive shaft (16) is fixedly connected to a gear (17). The right end of the drive shaft (16) is fixedly connected to a pulley (18). The pulley (18) is connected to a pulley (110) via a transmission belt (19). The pulley (110) is fixedly connected to the right output end of the geared motor (111). The lower end of the drive chamber (15) is fixedly connected to a slide (112). The right end of the drive chamber (15) is fixedly connected to the left output end of the hydraulic cylinder (114).
4. A plastic pellet injection molding apparatus according to claim 3, wherein The front gear 2 (113) meshes with gear 1 (17), and the lower end of the slide (112) is slidably connected to the upper end of the bracket (4).
5. A plastic pellet injection molding apparatus according to claim 4, wherein The vibration assembly includes two rotating cylinders (29) rotatably connected to the middle of the screw (14). The inner walls of the rotating cylinders (29) are distributed with protrusions (210) of different sizes. The left end of each rotating cylinder (29) is provided with multiple air inlets (211). The outer periphery of the right end of each rotating cylinder (29) is provided with multiple air outlets (212). The middle of the right end of each rotating cylinder (29) is rotatably connected to an eccentric seat (28). The left end of each eccentric seat (28) is fixedly connected to a rotating rod (213). Springs (214) are spirally distributed on the outer periphery of the rotating rod (213). The end of each spring (214) away from the rotating rod (213) is fixedly connected to a striking ball (215).
6. A plastic granule injection molding equipment according to claim 5, characterized in that, The left end of each rotating rod (213) is rotatably connected to the middle of the left end of the rotating cylinder (29), the left end of each eccentric seat (28) is rotatably connected to the front and rear openings on the left side of the drive chamber (15), and the left end of each rotating cylinder (29) is slidably connected to the front and rear openings on the left side of the housing (11).
7. A plastic granule injection molding equipment according to claim 6, characterized in that, The transmission assembly includes a limiting platform (25) located in the middle of the drive chamber (15), two gears (21) rotatably connected to the left side of the drive chamber (15), and two pulleys (216) fixedly connected to the right end of the eccentric seat (28). Gears (22) are fixedly connected to the right end of each gear (21), and gears (218) are meshed with each gear (22). A gearbox (24) is fixedly connected to the upper end of the limiting platform (25). Gears (23) are fixedly connected to the left input end of the gearbox (24), and gears (26) are fixedly connected to the right output end of the gearbox (24). Gears (27) are meshed with each other. The front and rear pulleys (216) are connected by a transmission belt (217).
8. A plastic granule injection molding equipment according to claim 7, characterized in that, All gears three (21) mesh with gear two (113), the middle part of all gears eight (218) is fixedly connected to the right side of the outer periphery of the rotating cylinder (29), the right end of all rotating cylinders (29) is rotatably connected to the front and rear openings of the limiting platform (25), and the right end of the rear eccentric seat (28) is fixedly connected to the middle part of gear seven (27).
9. A plastic granule injection molding equipment according to claim 8, characterized in that, The inner circumference of the air blowing pipe (33) is rotatably connected to the outer circumference of the rotating cylinder (29), the upper end of the guide pipe (35) is fixedly connected to the front and rear openings at the lower end of the feed hopper (12), the outer circumference of the right end of the eccentric seat (28) is rotatably connected to the right opening of the air collecting pipe (34), and the left end of the air collecting pipe (34) is fixedly connected to the right end of the limiting platform (25).
10. A method for injection molding plastic granules, applied to the plastic granule injection molding equipment described in claim 9, characterized in that, Includes the following steps: S1. Put the raw materials into the feed hopper (12), start the hot air mechanism (3) to preheat the rotating drum (29) and screw (14), and blow the tail air to disperse, preheat and dry the raw materials; S2. Start the geared motor (111) to drive the screw (14) to rotate and feed the material, and at the same time start the resistance heating coil (13) to heat and melt the raw material; S3. When the screw (14) rotates, it drives the vibration mechanism (2) through gear two (113) to eliminate bubbles in the molten raw material; S4. Start the hydraulic cylinder (114) to drive the screw (14) to move back and forth for injection molding.