Screw type injection molding equipment for injection molding

Abstract

The invention discloses screw type injection molding equipment for injection molding, and relates to the technical field of injection molding devices, the screw type injection molding equipment comprises an injection molding machine and a material pipe, and the top of the material pipe is provided with a conveying mechanism capable of discharging plastic particles; according to the plastic particle stirring device, the spiral blades can do circular motion around the transmission gear through the transmission gear and the connecting plate, dead corners in the charging barrel are reduced, it is ensured that plastic particles in the charging barrel can be fully stirred, meanwhile, through the threaded shape of the spiral blades, the plastic particles can be turned up and down when the spiral blades rotate, and the stirring efficiency is improved. And the plastic particles can be longitudinally shaken while the drying effect of the plastic particles is improved, and the surfaces of the plastic particles are primarily cleaned through shaking.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding devices, in particular to an injection molding device for screw type injection molding. Background Art

[0002] Before plastic pellets enter the screw injection molding machine, they usually need to be dried. During storage and transportation, plastic pellets tend to absorb a certain amount of moisture. If this moisture is not removed during the injection molding process, quality problems such as bubbles, silver wires, and strength loss will occur during the injection molding process. Therefore, plastic pellets usually need to be dried before entering the screw injection molding machine.

[0003] The internal screw design of existing screw injection molding equipment is usually a single-stage thread design, which cannot effectively control the conveying speed and compression ratio of plastic particles in the screw, resulting in poor melting and mixing of plastic particles in the screw, affecting the quality and efficiency of injection molded products. In addition, the interior of the screw of existing screw injection molding machines is mostly sealed, and when the plastic particles are melted, the residual moisture inside will form water vapor at the screw, and the gas generated during the compression process cannot be discharged in time, which will affect the quality of the plastic melt and the effect of injection molding. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of poor melting and mixing of plastic particles in a screw and inability to discharge gas in time, and to propose an injection molding device for screw type injection molding.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An injection molding device for screw type injection molding comprises an injection molding machine and a material pipe, wherein a conveying mechanism capable of feeding plastic particles is arranged on the top of the material pipe;

[0007] The conveying mechanism includes a feed port connected to the top of the feed pipe, a barrel for storing plastic particles is fixedly installed at the top of the feed port, a ring frame is fixedly installed inside the barrel, a dryer capable of drying the plastic particles is arranged on one side of the injection molding machine, and a rotating assembly capable of turning the plastic particles up and down is also installed inside the barrel;

[0008] It also includes a screening mechanism installed inside the annular frame and capable of collecting impurities on the surface of plastic particles. The screening mechanism includes a plurality of filter plates rotatably installed inside the annular frame. A second motor is fixedly installed on one side of the annular frame. The annular frame is also equipped with a transmission component inside that can open and close the filter plates.

[0009] As a further description of the above technical solution:

[0010] The rotating assembly includes a first motor fixedly mounted on the top of the barrel, the output end of the first motor extends into the interior of the barrel and is fixedly connected to a rotating plate, a driving gear is fixedly connected to the top of the inner wall of the barrel, driven gears are symmetrically mounted on the rotating plate, a plurality of transfer gears are rotatably mounted on the bottom end of the rotating plate, a connecting plate is fixedly connected to the bottom end of the transfer gear, and a stirring component is mounted on one side of each connecting plate.

[0011] As a further description of the above technical solution:

[0012] The stirring component comprises a spiral blade fixedly mounted on the connecting plate, and a scraper is fixedly connected to the bottom end of the spiral blade.

[0013] As a further description of the above technical solution:

[0014] The driving gear is sleeved on the output end of the first motor, and the driven gear is rotatably mounted on the rotating plate. The driving gear is meshed with one of the driven gears, and the other driven gear is meshed with the transmission gear.

[0015] As a further description of the above technical solution:

[0016] Both sides of the bottom end of the scraper are arranged as arc surfaces, and the arc surface of the bottom end of the scraper is in contact with the top end of the filter plate.

[0017] As a further description of the above technical solution:

[0018] The transmission assembly includes a driving gear fixedly mounted on the output end of the second motor, a fan-shaped frame is fixedly connected to one side of each filter plate, a circular ring is rotatably connected inside the annular frame, a plurality of through grooves are equidistantly formed at the bottom end of the annular frame, a material collection box is connected to the bottom end of the annular frame by a buckle, and a collection box is fixedly connected to the bottom end of the filter plate.

[0019] As a further description of the above technical solution:

[0020] The driving gear is meshed with the outer ring of the circular ring, and the inner ring of the circular ring is meshed with the teeth on the outer side of the fan-shaped frame.

[0021] As a further description of the above technical solution:

[0022] The deflation assembly includes a rotating rod fixedly installed at the bottom of the driving gear, a first gear is fixedly installed on the surface of the rotating rod, a plurality of cylinders are fixedly installed at the top of the material pipe, a second gear is rotatably connected to the top of each cylinder, a synchronous belt is meshed between the plurality of second gears and the first gear, and a piston is threadedly connected to the middle of each second gear.

[0023] As a further description of the above technical solution:

[0024] The bottom end of the piston is conical, and one end of the piston cone extends into the inside of the material tube. The screw inside the material tube is divided into three sections, and the pitches of each section of the screw are different.

[0025] As a further description of the above technical solution:

[0026] A sealing plate is inserted at the bottom end of the collection box, and the bottom end of the inner wall of the collection box is arranged as an inclined surface.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. By providing a conveying mechanism, when the first motor drives the rotating plate to rotate, the rotating plate will drive the driven gear, the transmission gear, the connecting plate and the stirring component to start rotating, and the plastic particles inside the barrel are stirred by the rotating stirring component, which cooperates with the dryer to achieve the drying effect; while the whole rotates, the spiral blades will also move in a circle around the transmission gear through the transmission gear and the connecting plate, thereby reducing the dead angle in the barrel and ensuring that the plastic particles inside the barrel can be fully stirred. At the same time, the spiral blades have a threaded shape, so that the spiral blades can turn the plastic particles up and down when they rotate with the connecting plate. While improving the drying effect of plastic particles, the threaded structure will produce a periodic shaking effect on the plastic particles when rotating, and the surface of the plastic particles will be initially cleaned by shaking; when the three sets of spiral blades rotate to the center of the barrel, the distance between the three sets of spiral blades is reduced, and the plastic particles in the center will be squeezed at this time. When the spiral blades rotate to the initial state, the plastic particles are located between the spiral blades and the barrel, which can also have an squeezing effect to prevent the existence of agglomerated plastic particles. At the same time, the squeezed plastic particles will also rub against each other, and the surface of the plastic particles will be further cleaned by friction.

[0029] 2. Through the arc surfaces set on both sides of the bottom of the scraper, when the scraper rotates, the arc surface facing the rotation direction will shovel up the plastic particles on the top of the filter plate, so that the top of the filter plate will not accumulate. At the same time, the arc surface on the other side of the scraper will squeeze the impurities stuck in the holes of the filter plate downward, which helps to push the impurities through the filter plate and prevent the filter plate from being blocked.

[0030] 3. By providing a screening mechanism, impurities can fall into the collection box through the filter plate and be collected. During drying, the second motor is driven to make the driving gear drive the ring to rotate, and the fan-shaped frame is driven to rotate through the ring, and the fan-shaped frame drives the filter plate and the collection box to rotate back to the inside of the annular frame. At this time, the inclined surface at the top of the collection box will push the sealing plate inserted at the bottom of the rotating collection box upward to form a gap, so that the impurities inside the collection box will fall into the collection box through the inclined surface and the gap at the bottom of the collection box and be collected.

[0031] 4. The screw inside the material pipe is divided into three sections. When the plastic particles enter the material pipe, the plastic particles are in the A1 area, and the pitch between the screws in the A1 area increases, so that when the screw rotates, the plastic particles can be quickly transported to the A2 area through the A1 area, and the pitch in the A2 area decreases, so that the plastic particles are compressed with each other and begin to melt. The reduction in pitch can increase the compression and melting time, so that the plastic particles can be fully melted into liquid and enter the A3 area, and the pitch in the A3 area is reduced again, so that the liquid can be accurately measured when injected into the mold. The screw is divided into three sections, and the pitch and thread depth of each section are different, which can effectively control the conveying speed and compression ratio of the plastic particles in the screw, thereby optimizing the melting, mixing and conveying process of the plastic, and improving the quality and efficiency of injection molding.

[0032] 5. By providing a venting component, when the driving gear rotates, the rotating rod will also drive the first gear to rotate, and the second gears will rotate through the synchronous belt, so that the piston will rise. At this time, when the plastic particles are melted in the A2 area, the residual moisture inside will form water vapor. The holes formed by the rising piston allow the water vapor to be discharged from the inside of the barrel. Since the pitch of the A2 area is reduced and the conveying time is increased, the plastic particles can be fully melted and the water vapor can be fully discharged at the same time. If there is gas inside the barrel, the flow of the melt will be unstable, affecting the accuracy and consistency of injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It shows an overall schematic diagram provided according to an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a conveying mechanism provided according to an embodiment of the present invention is shown;

[0035] Figure 3 A cross-sectional view of a cartridge according to an embodiment of the present invention is shown;

[0036] Figure 4 The embodiment of the present invention provides Figure 3 Another perspective of the picture;

[0037] Figure 5A schematic diagram of a rotating assembly provided according to an embodiment of the present invention is shown;

[0038] Figure 6 The embodiment of the present invention provides Figure 4 A magnified image of area A;

[0039] Figure 7 A schematic diagram of a screening mechanism provided according to an embodiment of the present invention is shown;

[0040] Figure 8 A schematic diagram showing the positions of a collecting box and a filter plate provided in an embodiment of the present invention is shown;

[0041] Fig. 9 A schematic diagram of a deflation assembly provided according to an embodiment of the present invention is shown;

[0042] Fig.10 The effect diagram of the scraper and the filter plate in contact according to the embodiment of the present invention is shown;

[0043] Fig.11 The effect diagram of the spiral blade rotating 180 degrees according to the embodiment of the present invention is shown;

[0044] Fig.12 The effect diagram of the collecting box and the sealing plate provided according to the embodiment of the present invention is shown;

[0045] Fig.13 A cross-sectional view of a material collection box according to an embodiment of the present invention is shown;

[0046] Fig.14 The effect diagram showing the division of the screw inside the material tube into three areas according to an embodiment of the present invention is shown.

[0047] Legend:

[0048] 10. Injection molding machine; 11. Material pipe;

[0049] 20. conveying mechanism; 21. feeding port; 22. barrel; 23. ring frame; 24. dryer; 25. rotating assembly; 251. first motor; 252. rotating plate; 253. driving gear; 254. driven gear; 255. transmission gear; 256. connecting plate; 257. stirring component; 2571. spiral blade; 2572. scraper;

[0050] 30. Screening mechanism; 31. Filter plate; 32. Second motor; 33. Transmission assembly; 331. Driving gear; 332. Fan-shaped frame; 333. Ring; 334. Through groove; 335. Collecting box; 336. Collecting box; 34. Degassing assembly; 341. Rotating rod; 342. First gear; 343. Cylinder; 344. Second gear; 345. Synchronous belt; 346. Piston. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1 - Fig.14 As shown, the present invention provides: an injection molding device for screw injection molding, including an injection molding machine 10 and a material pipe 11, the injection molding machine 10 is a screw injection molding device in the prior art, the working principle of the screw injection molding device includes three basic stages of melting plastic, injection molding and cooling and solidification, and the top of the material pipe 11 is provided with a conveying mechanism 20 capable of unloading plastic particles;

[0053] The conveying mechanism 20 includes a feed port 21 connected to the top of the material pipe 11, a barrel 22 for storing plastic particles is fixedly installed at the top of the feed port 21, and a folding plate (not marked in the figure) is hinged at the top of the barrel 22. By opening the folding plate, the plastic particles are poured into the barrel 22, and then enter the material pipe 11 through the feed port 21 at the bottom. An annular frame 23 is fixedly installed inside the barrel 22. A dryer 24 capable of drying the plastic particles is provided on one side of the injection molding machine 10. The dryer 24 is a prior art. When the dryer 24 is working, hot air enters the barrel 22 through its output end and then blows toward the plastic particles, thereby achieving a drying effect. The barrel 22 is also equipped with a rotating component 25 capable of flipping the plastic particles up and down.

[0054] It also includes a screening mechanism 30 installed inside the annular frame 23 and capable of collecting impurities on the surface of plastic particles. The screening mechanism 30 includes a plurality of filter plates 31 rotatably installed inside the annular frame 23. The plastic particles and impurities on their surfaces are screened by the filter plates 31. A second motor 32 is fixedly installed on one side of the annular frame 23. The interior of the annular frame 23 is also equipped with a transmission assembly 33 capable of opening and closing the filter plates 31.

[0055] like Figure 3 - Figure 6As shown, the rotating assembly 25 includes a first motor 251 fixedly mounted on the top of the barrel 22, the output end of the first motor 251 extends to the inside of the barrel 22 and is fixedly connected to a rotating plate 252, the rotating plate 252 can be driven by the first motor 251, a driving gear 253 is fixedly connected to the top of the inner wall of the barrel 22, driven gears 254 are symmetrically mounted on the rotating plate 252, and the driven gears 254 are grouped in pairs and are respectively arranged on the upper and lower sides of the rotating plate 252, a plurality of transfer gears 255 are rotatably mounted on the bottom end of the rotating plate 252, the bottom end of the transfer gear 255 is fixedly connected to a connecting plate 256, and a stirring component 257 is mounted on one side of each connecting plate 256.

[0056] In further detail, the stirring component 257 includes a spiral blade 2571 fixedly mounted on the connecting plate 256 , and a scraper 2572 is fixedly connected to the bottom end of the spiral blade 2571 .

[0057] In further detail, the driving gear 253 is sleeved on the output end of the first motor 251, and the driven gear 254 is rotatably mounted on the rotating plate 252. The driving gear 253 is meshed with one of the driven gears 254. When the first motor 251 drives the rotating plate 252 to rotate, the rotating plate 252 will drive the driven gear 254, the transmission gear 255, the connecting plate 256 and the stirring member 257 to start rotating, and the plastic particles inside the barrel 22 are stirred by the rotating stirring member 257. When the driven gear 254 rotates, it meshes with the driving gear 253, so that the upper and lower driven gears 254 can rotate, and the other driven gear 254 is meshed with the transmission gear 255, so that the transmission gear 255 will also rotate to drive the connecting plate 256 to rotate, so that the stirring member 257 will also make a circular motion with the transmission gear 255 as the center when rotating, thereby reducing the dead angle in the barrel 22 and ensuring that the plastic particles inside the barrel 22 can be fully stirred;

[0058] At the same time, due to the threaded shape of the spiral blades 2571, when the spiral blades 2571 rotate, the tangential force and axial force on the plastic particles will change alternately, and the tangential force causes the particles to slide along the surface of the spiral blades 2571. This alternating action will cause the particles to periodically move up and down on the spiral blades 2571, similar to the effect of a vibrating screen. The particles will collide with the surface of the spiral blades 2571 during each movement, thereby generating vibrations, so that the spiral blades 2571 can flip the plastic particles up and down when rotating, while improving the drying effect of the plastic particles, the plastic particles will also be shaken longitudinally, and the surface of the plastic particles will be initially cleaned by shaking. When the three groups of spiral blades 2571 rotate to the center of the barrel 22, the distance between the three groups of spiral blades 2571 is reduced, which will also have an extrusion effect on the plastic particles (such as Fig.11As shown), the plastic particles are prevented from agglomerating. At the same time, the squeezed plastic particles will rub against each other, and the surface of the plastic particles will be further cleaned by friction. As the plastic particles roll, the impurities will gradually fall and fall onto the top of the filter plate 31.

[0059] In further detail, the two sides of the bottom end of the scraper 2572 are set as arc surfaces, and the arc surface of the bottom end of the scraper 2572 contacts the top end of the filter plate 31 (such as Fig.10 As shown in the figure, when the scraper 2572 rotates following the spiral blade 2571, the scraper 2572 has arc-shaped settings on both sides of the bottom, and the arc surface facing the rotation direction will shovel up the plastic particles on the top of the filter plate 31, so that the top of the filter plate 31 will not accumulate plastic particles, and the bottom of the arc surface on the other side will squeeze the impurities stuck in the holes of the filter plate 31 downward, which helps to push the impurities through the filter plate 31, so that the filter plate 31 will not be blocked. At the same time, when the plastic particles are discharged, when the plastic particles are discharged through the feed port 21, the scrapers 2572 will evenly distribute the plastic particles when rotating to prevent certain areas from being blocked due to accumulation.

[0060] like Figure 7 - Figure 8 As shown, the transmission assembly 33 includes a driving gear 331 fixedly mounted on the output end of the second motor 32, and the driving gear 331 can be driven to rotate by the second motor 32. A fan-shaped frame 332 is fixedly connected to one side of each filter plate 31, and a circular ring 333 is rotatably connected inside the annular frame 23. A plurality of through grooves 334 are equidistantly provided at the bottom end of the annular frame 23, and a collection box 335 is connected to the bottom end of the annular frame 23 by a snap buckle. The collection box 335 can be disassembled and installed from the annular frame 23 by the snap buckle, and a collection box 336 is fixedly connected to the bottom end of the filter plate 31.

[0061] In further detail, the driving gear 331 is meshed with the outer ring of the ring 333. When the driving gear 331 rotates, the ring 333 will also rotate through the meshing, because the inner ring of the ring 333 is meshed with the teeth on the outside of the fan-shaped frame 332, so that the fan-shaped frame 332 will also drive the filter plate 31 and the collection box 336 to rotate through the rotating shaft and return to the inside of the annular frame 23, so that the plurality of filter plates 31 no longer block the plastic particles inside the barrel 22, so that the plastic particles after drying and impurity removal can be discharged for use.

[0062] In further detail, a sealing plate is inserted into the bottom end of the collection box 336, and the bottom end of the inner wall of the collection box 336 is set to an inclined surface. When the filter plate 31 drives the collection box 336 to rotate to the inside of the annular frame 23, the inclined surface at the top of the collection box 335 will push the sealing plate at the bottom of the rotating collection box 336 upward to form a gap. At this time, the top of the sealing plate contacts the bottom end of the filter plate 31, so that the impurities in the collection box 336 will fall into the collection box 335 through the inclined surface and the gap at the bottom thereof for collection (such as Figure 12-13 as shown).

[0063] like Fig. 9 As shown, the deflation assembly 34 includes a rotating rod 341 fixedly mounted at the bottom of the driving gear 331, and the bottom end of the rotating rod 341 is rotatably mounted on the material tube 11. When the driving gear 331 rotates, the rotating rod 341 is also driven to rotate. A first gear 342 is fixedly mounted on the surface of the rotating rod 341, and the rotating rod 341 drives the first gear 342 to rotate. A plurality of cylinders 343 are fixedly mounted on the top of the material tube 11, and a plurality of through holes (not marked in the figure) are opened on the surface of the cylinder 343. After the plastic particles enter the interior of the material barrel 22, they will be preliminarily dried by the hot air blown out by the dryer 24. When the plastic particles are melted, the plastic particles inside The remaining moisture will form water vapor, which can be quickly discharged through the through holes. If the water vapor cannot be discharged, it will cause defects such as bubbles, silver streaks, shrinkage, etc. in the injection molded products, seriously affecting the product quality. The top of each cylinder 343 is rotatably connected to a second gear 344, and a synchronous belt 345 is meshed between the second gears 344 and the first gear 342. The middle part of each second gear 344 is threadedly connected to a piston 346. When the first gear 342 rotates, the second gears 344 are also rotated synchronously through the transmission of the synchronous belt 345, so that the threaded piston 346 moves upward.

[0064] In further detail, the bottom end of the piston 346 is conical, and one end of the piston 346 extends into the inside of the material tube 11. When the piston 346 rises, a hole is formed at the top of the material tube 11, so that the water vapor inside the material tube 11 can be discharged. If liquid splashes out of the hole, the splashed liquid will slide along the surface of the hole into the inside of the material tube 11 due to the conical shape of the hole. The screw inside the material tube 11 is divided into three sections, and the pitch of each screw section is different (such as Fig.14As shown in the figure, the screw is divided into three sections. The first section is the feeding zone (A1). Since the pitch between the feeding zone (A1) is large, the plastic particles move a large distance in the axial direction each time the screw rotates one circle, thereby increasing the conveying speed. The second section is the hot melting zone (A2). The pitch of the hot melting zone (A2) is reduced. The reduced pitch reduces the axial movement distance of the plastic particles each time the screw rotates one circle, thereby reducing the conveying speed. At the same time, since the distance between the pitches is also reduced, the compression effect of the screw on the plastic particles is increased, so that the plastic particles gradually melt into a flowing melt. The design of this section ensures that the plastic particles have enough time and pressure to be evenly mixed and melted during the melting process.

[0065] The third section is the injection zone (A3). The pitch of the injection zone (A3) is reduced again. The minimum pitch makes the axial movement distance of the plastic melt minimum when the screw rotates one circle, thereby ensuring the accuracy and stability of the injection process. The distance between the threads is reduced again, further increasing the compression and mixing effect of the screw on the plastic melt, ensuring that the temperature and fluidity of the plastic melt are consistent, thereby improving the quality of injection molding;

[0066] If A1>A2>A3 (indicating that the pitch of the first section (feeding zone) is greater than the pitch of the second section (hot melt zone), and the pitch of the second section (hot melt zone) is greater than the pitch of the third section (injection zone)), the pitch of the first section is greater than the pitch of the second section, so that the conveying speed of the plastic particles in the feeding zone is faster, and the conveying speed in the hot melt zone is slower, ensuring that the plastic particles have enough time to be compressed and melted in the hot melt zone. The pitch of the second section is greater than the pitch of the third section, so that the conveying speed of the plastic particles in the hot melt zone is slower, and the conveying speed in the injection zone is even slower, ensuring that the plastic melt can be accurately measured and mixed in the injection zone;

[0067] The thread depth of each section also gradually decreases, so the conveying speed of plastic particles in the first section is the fastest, and the conveying speed in the third section is the slowest. This design can ensure that the plastic particles are properly processed at different stages, such as rapid conveying in the feeding area, gradual compression and melting in the hot melt area, and precise metering and mixing in the injection area.

[0068] Working principle: When in use, open the folding plate on the top of the barrel 22, then pour the plastic particles into the barrel 22, then start the dryer 24 so that the hot air enters the barrel 22 through its output end, and then blows towards the plastic particles, then start the first motor 251 to drive the rotating plate 252 to rotate, at this time the rotating plate 252 will drive the driven gear 254, the transmission gear 255, the connecting plate 256 and the stirring member 257 to start rotating, and the plastic particles inside the barrel 22 are stirred by the rotating stirring member 257, and the driven gear 254 is meshed with the driving gear 253 when rotating, so that the upper and lower driven gears 254 can rotate, and the other driven gear 254 is meshed with the transmission gear 255, so that the transmission gear 255 will also rotate to drive the connecting plate 256 to rotate, so that the stirring member 257 will also make a circular motion with the transmission gear 255 as the center when rotating;

[0069] The scraper 2572 will also rotate with the spiral blade 2571. Through the arc-shaped settings on both sides of the bottom of the scraper 2572, the arc surface facing the rotation direction will shovel up the plastic particles on the top of the filter plate 31, so that the top of the filter plate 31 will not accumulate plastic particles, and the bottom of the arc surface on the other side will squeeze the impurities stuck in the holes of the filter plate 31 downward, which helps to push the plastic particles through the filter plate 31.

[0070] After drying and cleaning, the second motor 32 is started to drive the gear 331 to rotate, and the ring 333 is also rotated through meshing, because the inner ring of the ring 333 is meshed with the teeth on the outer side of the fan-shaped frame 332, so that the fan-shaped frame 332 also drives the filter plate 31 and the collection box 336 to rotate through the rotating shaft and return to the inside of the annular frame 23, so that the plurality of filter plates 31 no longer block the plastic particles in the barrel 22, allowing the plastic particles to be discharged into the material pipe 11;

[0071] The screw inside the material pipe 11 rotates under the drive of the motor, conveying the plastic particles in the feeding area, and then entering the hot melt area, and heating them through the heating device (usually an electric heating ring) in the material pipe 11. The temperature inside the material pipe 11 will be accurately controlled according to the type of plastic particles and molding requirements, so that the plastic particles gradually soften and melt into a flowing melt. The thread structure of the screw will convey the molten plastic forward and enter the injection area. At the same time, the rotation of the screw will also produce a shearing effect on the plastic melt, further evenly mixing and melting the plastic particles, ensuring that the temperature and fluidity of the plastic melt are consistent. When the plastic melt reaches a suitable temperature and fluidity, the injection system of the injection area begins to prepare. The injection system usually includes an injection cylinder and an injection piston, and the injection piston is moved forward by a hydraulic or electric drive device;

[0072] The injection piston pushes the plastic melt into the mold cavity through the nozzle and the mold's pouring system (such as the main channel, branch channel, gate, etc.). The injection speed and pressure can be adjusted according to the product structure and molding requirements to ensure that the plastic melt can quickly and evenly fill the mold cavity to avoid defects such as bubbles and weld marks, thereby completing the injection molding. After cooling, the plastic product is ejected from the mold through the mold opening mechanism set on the mold;

[0073] At the same time, when the driving gear 331 rotates, the rotating rod 341 will also start to rotate the first gear 342, and the second gears 344 will also rotate synchronously through the transmission of the synchronous belt 345, so that the threaded piston 346 moves upward and forms a hole at the top of the material tube 11, so that the water vapor in the hot melt zone can be discharged;

[0074] When the filter plate 31 drives the collection box 336 to rotate into the annular frame 23, the top of the collection box 335 will push the bottom sealing plate of the rotating collection box 336 upward, so that the impurities inside the collection box 336 will fall into the collection box 335 through the inclined surface at the bottom and be collected.

[0075] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An injection molding device for screw type injection molding, comprising an injection molding machine (10) and a material pipe (11), characterized in that: The top of the material pipe (11) is provided with a conveying mechanism (20) capable of discharging plastic particles; The conveying mechanism (20) comprises a feed port (21) connected to the top of the feed pipe (11), a barrel (22) for storing plastic particles is fixedly installed at the top of the feed port (21), a ring frame (23) is fixedly installed inside the barrel (22), a dryer (24) capable of drying the plastic particles is arranged on one side of the injection molding machine (10), and a rotating assembly (25) capable of turning the plastic particles up and down is also installed inside the barrel (22); It also includes a screening mechanism (30) mounted inside the annular frame (23) and capable of collecting impurities on the surface of the plastic particles. The screening mechanism (30) includes a plurality of filter plates (31) rotatably mounted inside the annular frame (23). A second motor (32) is fixedly mounted on one side of the annular frame (23). A transmission assembly (33) capable of opening and closing the filter plates (31) is also mounted inside the annular frame (23). The material pipe (11) is also equipped with a venting assembly (34) capable of discharging water vapor during hot melting.

2. The screw injection molding device according to claim 1, characterized in that: The rotating assembly (25) comprises a first motor (251) fixedly mounted on the top of the barrel (22); the output end of the first motor (251) extends into the interior of the barrel (22) and is fixedly connected to a rotating plate (252); a driving gear (253) is fixedly connected to the top of the inner wall of the barrel (22); driven gears (254) are symmetrically mounted on the rotating plate (252); a plurality of transmission gears (255) are rotatably mounted on the bottom end of the rotating plate (252); a connecting plate (256) is fixedly connected to the bottom end of the transmission gear (255); and a stirring component (257) is mounted on one side of each connecting plate (256).

3. The screw injection molding device according to claim 2, characterized in that: The stirring component (257) comprises a spiral blade (2571) fixedly mounted on the connecting plate (256), and a scraper (2572) is fixedly connected to the bottom end of the spiral blade (2571).

4. The screw injection molding device according to claim 3, characterized in that: The driving gear (253) is sleeved on the output end of the first motor (251), and the driven gear (254) is rotatably mounted on the rotating plate (252). The driving gear (253) meshes with one of the driven gears (254), and the other driven gear (254) meshes with the transmission gear (255).

5. The screw type injection molding device according to claim 4, characterized in that: Both sides of the bottom end of the scraper (2572) are arranged as arc surfaces, and the arc surface at the bottom end of the scraper (2572) is in contact with the top end of the filter plate (31).

6. The screw type injection molding device according to claim 1, characterized in that: The transmission assembly (33) comprises a driving gear (331) fixedly mounted on the output end of the second motor (32); one side of each filter plate (31) is fixedly connected to a fan-shaped frame (332); a circular ring (333) is rotatably connected inside the annular frame (23); a plurality of through slots (334) are equidistantly formed at the bottom end of the annular frame (23); a material collection box (335) is connected to the bottom end of the annular frame (23) via a buckle; and a collection box (336) is fixedly connected to the bottom end of the filter plate (31).

7. The screw type injection molding device according to claim 6, characterized in that: The driving gear (331) meshes with the outer ring of the circular ring (333), and the inner ring of the circular ring (333) meshes with the teeth on the outer side of the fan-shaped frame (332).

8. The screw type injection molding device according to claim 7, characterized in that: A sealing plate is inserted into the bottom end of the collection box (336), and the bottom end of the inner wall of the collection box (336) is arranged as an inclined surface.

9. The screw injection molding device according to claim 8, characterized in that: The deflation assembly (34) comprises a rotating rod (341) fixedly mounted at the bottom of the driving gear (331), a first gear (342) being fixedly mounted on the surface of the rotating rod (341), a plurality of cylinders (343) being fixedly mounted at the top of the material tube (11), a second gear (344) being rotatably connected to the top of each cylinder (343), a synchronous belt (345) being meshed between the plurality of second gears (344) and the first gear (342), and a piston (346) being threadedly connected to the middle of each second gear (344).

10. The screw type injection molding device according to claim 9, characterized in that: The bottom end of the piston (346) is conical, and one end of the piston (346) extends into the interior of the material tube (11). The screw inside the material tube (11) is divided into three sections, and the pitches of the screws in each section are different.

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