Screw conveyor for injection molding of plastic parts

Abstract

The invention discloses a spiral conveyor for plastic part injection molding, and relates to the technical field of plastic conveying, when material winding occurs, a spiral conveying blade can change the spiral span L and the spiral diameter H, the changed spiral span L2 is larger than the spiral span L1 before change, but the changed spiral diameter H2 is smaller than the spiral diameter H1 before change, and the changed spiral span L2 is larger than the changed spiral span L1 before change. According to the simple understanding, the stroke of spiral conveying can be increased after change, so that hard extrusion on spiral conveying blades due to increase of conveying pressure is relieved, and the spiral conveying blades are flexibly protected; meanwhile, automatic identification of wound materials is achieved through relative displacement between the rotating shaft and the driven shaft, and horizontal shearing force is provided through telescopic self-adaption of the material cutting assembly so as to cut off elastic leftover materials which are tightly wound; the problem that the spiral conveying blade is damaged due to the fact that strong impact force is generated at the moment of breaking when the winding corners are forcibly pulled apart is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic conveying, in particular to a screw conveyor for injection molding of plastic accessories. Background Art

[0002] The screw conveyor for injection molding of plastic accessories is a plastic processing and conveying equipment for arranging and pressurizing plastic raw materials. For example, the anti-sticking powder screw conveyor proposed in publication number CN119059184A introduces the powder material into the guide ball, which then slides downward along the inner wall of the guide ball and slides to the surface of the bent pad. At this time, the powder material sliding downward squeezes the bent pad, causing the curved sheet to sink downward and abut against the inner squeeze sheet, thereby providing preliminary buffering for the powder material through the curved sheet, preventing the powder material from sliding directly into the conveying barrel during introduction, causing toxic dust to fly and cause harm to the workers.

[0003] For plastic processing, screw conveyors are mostly front-end pressure conveying mechanisms for the reprocessing of molded plastics. For example, some molded recycled plastics are crushed and then put into the conveyor for overall pressurized transmission. At the same time, some scraps generated during plastic processing are also put into the screw conveyor. The unprocessed scraps are easily entangled on the auger shaft as the shaft rotates when the conveyor is spirally transmitted. Once entanglement occurs, the entanglement will become tighter and tighter as the auger continues to rotate. When the entanglement reaches a certain degree, the diameter of the spiral channel is reduced, resulting in a decrease in the transmission performance of the auger per unit time, while external materials are still continuously input. The difference between input and output per unit time will cause the pressure in the screw conveyor to increase, which will cause the auger blades to be subjected to additional pressure in addition to the system pressure. Long-term high-frequency repetitions can easily cause micro-deformation of the auger, resulting in unstable transmission pressure connection problems. Eventually, the auger blades will forcibly tear off the entangled plastic scraps under the powerful torque output of the machine shaft. Plastic has good ductility and elongation at break. Forcible tearing will produce a strong impact force at the moment of breaking, which will not only damage the auger blades, but in severe cases, cause equipment vibration and impact damage to the machine shaft. Cause analysis: Screw conveyors have great advantages in the field of pressure conveying and are suitable for pressure transmission of a variety of materials. However, due to the lack of shear force when conveying strip materials, when entanglement occurs, the materials will become tighter and tighter and cannot be untied by themselves. They can only be forcibly torn apart, causing impact on the machine shaft and the blades.

[0004] In response to the above problems, the present invention provides a screw conveyor for plastic parts injection molding that adaptively provides shear force based on pressure changes within the screw conveyor. Summary of the Invention

[0005] The technical solution of the present invention is to address the technical problem that the existing technical solutions are too simple, and provide a solution that is significantly different from the existing technologies. Specifically, the purpose of the present invention is to provide a screw conveyor for injection molding of plastic accessories, so as to solve the problem proposed in the above background technology that unprocessed scraps are easily entangled on the screw shaft as the shaft rotates when being spirally transmitted by the conveyor. Once entanglement occurs, the entanglement will become tighter and tighter as the auger continues to rotate. When the entanglement reaches a certain extent, the diameter of the spiral channel is reduced, resulting in a decrease in the transmission performance of the auger per unit time, while external materials are still continuously input. The difference between input and output per unit time will cause the pressure in the screw conveyor to increase, which will cause additional pressure on the auger blades beyond the system pressure. Long-term high-frequency repetition will easily cause micro-deformation of the auger, resulting in unstable transmission pressure connection. Finally, the auger blades will forcibly tear off the entangled plastic scraps under the strong torque output of the machine shaft. Plastic has good ductility and elongation at break. Forcible tearing will generate a strong impact force at the moment of disconnection, which will not only damage the auger blades, but in severe cases will cause equipment vibration and impact damage to the machine shaft.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a screw conveyor for injection molding of plastic accessories, comprising a screw conveyor housing, an output motor fixedly mounted on the end of the screw conveyor housing, an output rotor connected to the output shaft of the output motor, and an auxiliary feeding assembly, and also comprising a rotating shaft arranged in the feeding cavity of the screw conveyor housing, a driven shaft slidably arranged inside the rotating shaft and connected to the end of the screw conveyor housing, and a cutting assembly evenly distributed inside the driven shaft for detecting changes in the pressure in the feeding cavity and adaptively extending and retracting and performing staggered cutting, the outer wall of the rotating shaft is provided with spiral conveying blades that adaptively adjust the spiral span and spiral diameter based on changes in the pressure in the feeding cavity.

[0007] Preferably, the auxiliary feeding assembly includes a feeding cone barrel, a transmission mechanism and a stirring assembly, and the feeding cone barrel is installed through the upper end of the screw conveyor housing, and the stirring assembly is installed inside the feeding cone barrel; A transmission mechanism is installed between the stirring component and the screw conveyor shell.

[0008] Preferably, the stirring assembly includes a stirring blade arranged in the feeding opening of the feeding cone barrel and a stirring shaft penetrating the feeding cone barrel to drive the stirring blade to rotate continuously; The transmission mechanism comprises pulleys which are respectively fixed to the outer wall of the output rotor and the outer wall of the stirring shaft, and a belt for connecting the two pulleys.

[0009] Preferably, a rectangular slide groove is provided inside the output rotor, and one end of a T-shaped slide rod is provided inside the rectangular slide groove for sliding matching, and the other end of the T-shaped slide rod passes through the output rotor and is fixedly connected to the end of the rotating shaft.

[0010] Preferably, the inner part of the driven shaft is uniformly provided with a limiting cavity slot, and the inner wall of the limiting cavity slot is symmetrically welded with one end of the first spring, and the other end of the first spring is fixed to the end of the material breaking assembly.

[0011] Preferably, the material breaking assembly is composed of a rectangular seat which is slidingly matched with the limiting cavity slot, and a cutting blade which is fixedly connected with the rectangular seat. The outer wall of the rotating shaft is through-provided with a blade slot which is slidingly matched with the cutting blade and is arranged in a staggered manner with the limiting cavity slot.

[0012] Preferably, the blade slot is uniformly provided in the area on the outer wall of the rotating shaft which is not covered by the spiral conveying blade.

[0013] Preferably, the end of the rotating shaft close to the output rotor is slidingly provided with a fixed disc which is fixed to the inner wall of the feeding inner cavity of the spiral conveyor shell. The end of the rotating shaft far away from the output rotor is fixedly connected with a sliding disc. The two ends of the spiral conveying blade are respectively fixed to one side of the fixed disc and one side of the sliding disc.

[0014] Preferably, the spiral conveying blade is slidingly connected with the rotating shaft, and the radius of the spiral conveying blade is matched with the feeding inner cavity of the spiral conveyor shell. The spiral conveying blade is made of elastic metal material. The sliding disc and the end of the feeding inner cavity are provided with a second spring. One end of the second spring is welded to the side wall of the sliding disc, and the other end of the second spring is fixed to the inner wall of the end of the feeding inner cavity.

[0015] Compared with the prior art, the present application has the following advantages: 1. When the plastic scraps are entangled, the conveying pressure in the screw conveyor gradually increases. The increased pressure will be fed back to the sliding plate connected to the end of the spiral conveying blade through the spiral conveying blade. Therefore, when the conveying pressure increases, the sliding plate will drive the end of the spiral conveying blade gradually away from the front end of the spiral conveying blade under the action of pressure and compress the second spring at the end, thereby causing the spiral span L and the spiral diameter H of the spiral conveying blade to change. The changed spiral span L2 is greater than the spiral span L1 before the change, but the changed spiral diameter H2 is smaller than the spiral diameter H1 before the change. Simply put, the stroke of the spiral conveying will increase after the change to alleviate the hard squeezing of the spiral conveying blade due to the increase in conveying pressure, and play a flexible protection role for the spiral conveying blade. At the same time, the changed spiral diameter is reduced, and the fit between the spiral conveying blade and the feeding cavity of the screw conveyor shell is no longer matched, but a certain gap is generated. The generation of the gap will lead to a decrease in the conveying performance of the spiral conveying blade, thereby further alleviating the problem of continuous increase in pressure in the screw conveyor caused by material entanglement, and further protecting the spiral conveying blade. Moreover, the opening of the gap facilitates the subsequent conveying of the entangled material after shearing to prevent secondary entanglement. Second, when winding occurs, the sliding disk will synchronously drive the rotating shaft to move toward the end of the screw conveyor housing, causing relative displacement between the rotating shaft and the driven shaft, so that the dislocation and tightening effect of the blade gap on the cutting component gradually disappears. Therefore, the cutting component will gradually extend from the inside of the blade gap to the spiral gap of the spiral conveying blade under the reset action of the first spring. The overall state achieved is: when relative displacement occurs between the rotating shaft and the driven shaft, the cutting blade of the cutting component will gradually extend from the blade gap during the displacement process. In fact, the horizontal position of the extended cutting blade remains unchanged, so the rotating shaft carries the winding material. During the backward movement, it will contact the gradually extended cutting blade, thereby forming a certain shear force between the cutting blade and the wrapped material, and under the shearing action of multiple groups of cutting blades evenly distributed in the spiral gap of the spiral conveying blade, the strip-shaped scraps wrapped on the spiral gap of the spiral conveying blade can be quickly cut off, thereby realizing automatic identification of the wrapped material and utilizing the telescopic adaptation of the cutting component to provide horizontal shear force to cut off the tightly wrapped elastic scraps, effectively avoiding the problem of forcibly tearing off the wrapped plastic scraps, which will cause damage to the spiral conveying blades due to the strong impact force at the moment of breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention under normal delivery pressure.

[0017] Figure 2 It is a three-dimensional schematic diagram of the present invention after winding occurs.

[0018] Figure 3The perspective view of the present application for the cutting assembly to retract.

[0019] Figure 4 The perspective view of the present application for the cutting assembly to cut.

[0020] Figure 5 The perspective view of the helical conveying blade under normal conveying pressure.

[0021] Figure 6 The perspective view of the helical conveying blade after winding occurs.

[0022] Figure 7 The connection diagram of the output rotor and the rotating shaft under normal conveying pressure.

[0023] Figure 8 The connection diagram of the output rotor and the rotating shaft after winding occurs.

[0024] Figure 9 The perspective view of the rotor and the rotating shaft under normal conveying pressure.

[0025] Figure 10 The perspective view of the rotor and the rotating shaft after winding occurs.

[0026] Figure 11 The enlarged structural diagram of A in the present application. Figure 9

[0027] Figure 12 The enlarged structural diagram of B in the present application. Figure 10

[0028] The comparative analysis diagram of the helical conveying blade after the posture changes under normal conveying pressure and after winding occurs. Figure 13 In the figure: 1, the helical conveying machine shell; 11, the output motor; 12, the feeding cone barrel; 13, the transmission mechanism; 14, the stirring assembly; 2, the output rotor; 21, the T-shaped sliding rod; 3, the rotating shaft; 31, the blade gap; 4, the driven shaft; 5, the limiting cavity groove; 51, the first spring; 52, the cutting assembly; 6, the fixed disc; 7, the sliding disc; 8, the helical conveying blade; 9, the second spring.

[0029] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] ​See also Figures 1 to 13 The present invention provides a technical solution: a screw conveyor for injection molding of plastic accessories, comprising a screw conveyor housing 1, an output motor 11 fixedly mounted at the end of the screw conveyor housing 1, an output rotor 2 connected to the output shaft of the output motor 11, and an auxiliary feeding assembly, further comprising a rotating shaft 3 arranged in the feeding cavity of the screw conveyor housing 1, a driven shaft 4 slidably arranged inside the rotating shaft 3 and connected to the end of the screw conveyor housing 1, and a cutting assembly 52 evenly distributed inside the driven shaft 4 for detecting changes in the pressure in the feeding cavity and adaptively extending and retracting and performing staggered cutting. The outer wall of the rotating shaft 3 is provided with a spiral conveying blade 8 that adaptively adjusts the spiral span and spiral diameter based on changes in the pressure in the feeding cavity.

[0032] In a specific implementation, when no entanglement occurs on the outside of the rotating shaft 3, the continuously rotating spiral conveying blades 8 and the rotating shaft 3 can stably pressurize and convey the plastic raw materials to the discharge channel at the end of the screw conveyor housing 1. During this period, the movable end of the spiral conveying blade 8 connected to the sliding disk 7 is tightened by the second spring 9 at the end to maintain a stable state. Therefore, when no entanglement occurs on the outside of the rotating shaft 3, the spiral conveying blade 8 will not change its posture and will stably and continuously rotate to spirally convey the plastic raw materials.

[0033] The auxiliary feeding assembly includes a feeding cone barrel 12, a transmission mechanism 13 and a stirring assembly 14, and the feeding cone barrel 12 is installed through the upper end of the screw conveyor housing 1, and the stirring assembly 14 is installed inside the feeding cone barrel 12; A transmission mechanism 13 is installed between the stirring assembly 14 and the screw conveyor housing 1 .

[0034] The stirring assembly 14 includes a stirring blade disposed in the feeding opening of the feeding cone barrel 12 and a stirring shaft penetrating the feeding cone barrel 12 for driving the stirring blade to rotate continuously; The transmission mechanism 13 includes pulleys fixed to the outer wall of the output rotor 2 and the outer wall of the stirring shaft, and a belt for connecting the two pulleys.

[0035] In a specific implementation, after the plastic recycled crushed raw materials and some plastic processing scraps are placed in batches inside the feed cone barrel 12, the output motor 11 drives the output rotor 2 to rotate continuously and synchronously drives the rotating shaft 3 and the external spiral conveying blade 8 to rotate continuously. At the same time, the output rotor 2 synchronously drives the stirring component 14 to rotate continuously inside the feed port of the feed cone barrel 12 through the cooperation between the pulley and the belt, and smoothly inputs the stacked plastics in the feed cone barrel 12 downward into the feeding cavity of the screw conveyor shell 1. This is the existing technology and will not be elaborated on here.

[0036] The inner part of the output rotor 2 is provided with a rectangular sliding groove, one end of a T-shaped sliding rod 21 is slidably matched in the rectangular sliding groove, and the other end of the T-shaped sliding rod 21 is fixedly connected with the end of the rotating shaft 3 penetrating the output rotor 2.

[0037] The inner part of the driven shaft 4 is uniformly provided with a limiting cavity groove 5, one end of a first spring 51 is symmetrically welded to the inner wall of the limiting cavity groove 5, and the other end of the first spring 51 is fixed to the end of a material cutting assembly 52.

[0038] In specific implementation, when the rotating shaft 3 moves towards the end of the screw conveyor shell 1, since the driven shaft 4 is connected with the end of the screw conveyor shell 1 and only follows the rotation without horizontal movement, the relative displacement between the rotating shaft 3 and the driven shaft 4 is generated.

[0039] The material cutting assembly 52 is composed of a rectangular seat slidably matched with the limiting cavity groove 5 and a cutting blade fixedly connected with the rectangular seat; The outer wall of the rotating shaft 3 is provided with a blade slot 31 slidably matched with the cutting blade and oppositely arranged with the limiting cavity groove 5.

[0040] In specific implementation, compared with the prior art Figure 11 and the prior art Figure 12 , when winding does not occur, as shown in the prior art Figure 11 , the material cutting assembly 52 in the driven shaft 4 is hidden in the limiting cavity groove 5 under the state of being compressed by the opposite abutting action of the blade slot 31, and when winding occurs, since the relative displacement between the rotating shaft 3 and the driven shaft 4 is generated, the opposite abutting action of the blade slot 31 on the material cutting assembly 52 gradually disappears, so that the material cutting assembly 52 gradually extends out of the blade slot 31 under the reset action of the first spring 51 to reach the state shown in the prior art Figure 12 .

[0041] The blade slot 31 is uniformly arranged on the outer wall of the rotating shaft 3 in the area not covered by the screw conveying blade 8.

[0042] In specific implementation, when winding occurs, since the relative displacement between the rotating shaft 3 and the driven shaft 4 is generated, the opposite abutting action of the blade slot 31 on the material cutting assembly 52 gradually disappears, so that the material cutting assembly 52 gradually extends out of the blade slot 31 under the reset action of the first spring 51 to reach the state shown in the prior art Figure 12 , at this time, the cutting blade of the material cutting assembly 52 extends into the screw gap of the screw conveying blade 8.

[0043] The end of the rotating shaft 3 close to the output rotor 2 is slidably sleeved with a fixed disc 6, and the outer edge of the fixed disc 6 is fixed to the inner wall of the feeding inner cavity of the screw conveyor shell 1. The end of the rotating shaft 3 away from the output rotor 2 is fixedly connected with a sliding disc 7. Both ends of the spiral conveying blade 8 are fixed to one side of the fixed plate 6 and one side of the sliding plate 7 respectively.

[0044] In specific implementation, when the conveying pressure in the screw conveyor gradually increases, the increased pressure will be fed back to the sliding plate 7 connected to the end of the spiral conveying blade 8 through the spiral conveying blade 8. Therefore, when the conveying pressure increases, the sliding plate 7 will drive the end of the spiral conveying blade 8 gradually away from the front end of the spiral conveying blade 8 under the action of pressure and compress the second spring 9 at the end (the front end of the spiral conveying blade 8 is fixed by the fixed plate 6 and will not move).

[0045] The spiral conveying blade 8 is slidably connected to the rotating shaft 3, and the radius of the spiral conveying blade 8 is adapted to the feeding cavity of the screw conveyor housing 1; The spiral conveying blade 8 is made of elastic metal; A second spring 9 is provided between the sliding disc 7 and the end of the feeding cavity; One end of the second spring 9 is welded to the side wall of the sliding plate 7, and the other end of the second spring 9 is fixed to the inner wall of the end of the feeding cavity.

[0046] In the specific implementation, when the spiral conveying blade 8 occurs as follows Figure 13 As shown in the figure, the changed spiral span L and the spiral diameter H show that the changed spiral span L2 is larger than the spiral span L1 before the change, but the changed spiral diameter H2 is smaller than the spiral diameter H1 before the change. Simply put, the spiral conveying stroke is increased after the change to alleviate the hard squeezing of the spiral conveying blades 8 due to the increase in conveying pressure, and plays a flexible protective role for the spiral conveying blades 8. At the same time, the changed spiral diameter is reduced, and the fit between the spiral conveying blades 8 and the feeding cavity of the screw conveyor housing 1 is no longer matched, but a certain gap is generated. The generation of the gap will lead to a reduction in the conveying performance of the spiral conveying blades 8, thereby further alleviating the problem of continuous increase in pressure in the screw conveyor caused by material entanglement, and further protecting the spiral conveying blades 8. In addition, the opening of the gap facilitates the subsequent conveying of the wound material after shearing to prevent secondary entanglement.

[0047] Working principle: When using the screw conveyor for injection molding of plastic accessories, first place the recycled and crushed plastic raw materials and some scraps from plastic processing in batches inside the feed cone 12 and start the output motor 11. The output motor 11 drives the output rotor 2 to rotate continuously and synchronously drives the rotating shaft 3 and the external spiral conveying blade 8 to rotate continuously. At the same time, the output rotor 2 synchronously drives the stirring component 14 to rotate continuously inside the feed port of the feed cone 12 through the cooperation between the pulley and the belt, and smoothly inputs the stacked plastics in the feed cone 12 downward into the feeding cavity of the screw conveyor shell 1.

[0048] When the winding does not occur outside the rotating shaft 3, the continuously rotating spiral conveying blade 8 and the rotating shaft 3 can stably pressurize and convey the plastic raw material to the discharge channel at the end of the spiral conveyor shell 1, and during this period, the movable end of the spiral conveying blade 8 connected with the sliding disc 7 is kept in a stable state by the abutting action of the second spring 9 at the end, so that the spiral conveying blade 8 does not change its posture and stably and continuously rotates to convey the plastic raw material when the winding does not occur outside the rotating shaft 3; When the strip-shaped leftover material is delivered to the inside of the spiral conveyor shell 1 in stages, the winding phenomenon is likely to occur outside the rotating shaft 3, and when the winding occurs, the winding becomes more and more compact with the continuous rotation of the rotating shaft 3 and the spiral conveying blade 8, and when the winding reaches a certain degree, the spiral channel diameter decreases, resulting in a decrease in the transmission of the spiral conveying blade 8 per unit time, while the external material continues to be input, and the input and output are not proportional, which leads to a gradual increase in the pressure in the spiral conveyor; When the conveying pressure in the spiral conveyor gradually increases, the increased pressure is fed back to the sliding disc 7 connected with the end of the spiral conveying blade 8 through the spiral conveying blade 8, so that when the conveying pressure increases, the sliding disc 7 drives the end of the spiral conveying blade 8 to gradually move away from the front end of the spiral conveying blade 8 under the action of the pressure and compresses the second spring 9 at the end (the front end of the spiral conveying blade 8 does not move due to the fixed action of the fixed disc 6), so that the spiral span L and the spiral diameter H of the spiral conveying blade 8 change as shown in Figure 13 The changed spiral span L2 is greater than the original spiral span L1, but the changed spiral diameter H2 is smaller than the original spiral diameter H1. In simple terms, the travel of the spiral conveying increases after the change to alleviate the hard extrusion of the spiral conveying blade 8 due to the increase in the conveying pressure, which plays a flexible protection role on the spiral conveying blade 8. At the same time, the spiral diameter decreases after the change, so that the spiral conveying blade 8 no longer matches the fit of the feeding inner cavity of the spiral conveyor shell 1 but a certain gap is generated, and the generation of the gap leads to a decrease in the conveying performance of the spiral conveying blade 8, thereby further alleviating the problem of the continuous increase in the pressure in the spiral conveyor due to the winding of the material and playing a further protection role on the spiral conveying blade 8. Moreover, the opening of the gap facilitates the subsequent conveying of the sheared winding material to prevent secondary winding; At the same time, by comparing the Figure 5 and the Figure 6 , the Figure 7 and the Figure 8 and the Figure 9 and the Figure 10When the sliding plate 7 compresses the second spring 9 at the end and stretches the spiral conveying blade 8, the sliding plate 7 will also synchronously drive the rotating shaft 3 to move toward the end of the screw conveyor housing 1, so that the rotating shaft 3 slides along the central through hole of the fixed plate 6 and gradually moves away from the output rotor 2. At the same time, the T-shaped slide bar 21 will adaptively slide inside the rectangular slide groove but will not affect the rotation transmission of the output rotor 2 to the rotating shaft 3; When the rotating shaft 3 moves toward the end of the screw conveyor housing 1, since the driven shaft 4 is connected to the end of the screw conveyor housing 1 and only follows the rotation without horizontal movement, a relative displacement will occur between the rotating shaft 3 and the driven shaft 4. Figure 11 and attached Figure 12 , if entanglement does not occur, Figure 11 As shown, the internal cutting component 52 of the driven shaft 4 is subjected to the dislocation and tightening effect of the blade slit 31 to maintain the state of compressing the first spring 51 and hidden in the limiting cavity groove 5. When winding occurs, due to the relative displacement between the rotating shaft 3 and the driven shaft 4, the dislocation and tightening effect of the blade slit 31 on the cutting component 52 gradually disappears, so that the cutting component 52 gradually extends from the inside of the blade slit 31 to the attached position under the reset effect of the first spring 51. Figure 12 In the state shown, the cutting blade of the material cutting component 52 extends into the spiral gap of the spiral conveying blade 8 (the winding phenomenon generally only occurs in the spiral gap of the spiral conveying blade 8). The overall motion state achieved is: when relative displacement occurs between the rotating shaft 3 and the driven shaft 4, the cutting blade of the material cutting component 52 will gradually extend from the blade gap 31 during the displacement. In fact, the horizontal position of the extended cutting blade is unchanged. Therefore, the rotating shaft 3 carrying the winding material will contact the gradually extended cutting blade during the backward movement, thereby forming a certain shear force between the cutting blade and the winding material (the cutting blade only extends but does not interact with the winding material). The shear force generated by the displacement is not generated), and the strip-shaped scraps wound on the spiral gap of the spiral conveying blade 8 can be quickly cut off under the shearing action of multiple sets of cutting blades evenly distributed in the spiral gap of the spiral conveying blade 8 (the change in the spiral conveying blade 8 when it is stretched is small, and the stroke is also small, so there will be no contact between the spiral conveying blade 8 and the cutting blade), thereby realizing automatic recognition of the wound material and utilizing the expansion and contraction adaptation of the cutting component 52 to provide horizontal shear force to cut the tightly wound elastic plastic, effectively avoiding the problem of forcibly tearing off the wound scraps, which will cause a strong impact force to damage the spiral conveying blade 8 at the moment of breaking; When the strip-shaped scraps wrapped around the spiral gap of the spiral conveying blade 8 are cut off, the material that was originally wrapped and could not be conveyed will recover its conveyability and will be conveyed to the end as the spiral conveying blade 8 continues to rotate, thereby restoring the transmission pressure in the feeding cavity of the screw conveyor housing 1. When the transmission pressure is restored, the extrusion force on the sliding disk 7 is also gradually restored, thereby pushing the sliding disk 7 to reset under the reset action of the second spring 9, and then the spiral conveying blade 8 returns to its initial state and uses the blade gap 31 to squeeze the cutting component 52 into the limiting cavity 5 again to keep it hidden for subsequent shearing and use.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screw conveyor for injection molding of plastic parts, comprising a screw conveyor housing (1), an output motor (11) fixedly mounted at the end of the screw conveyor housing (1), an output rotor (2) connected to the output shaft of the output motor (11), and an auxiliary feeding assembly, characterized in that: The invention also includes a rotating shaft (3) arranged in the feeding cavity of the screw conveyor housing (1), a driven shaft (4) slidably arranged in the rotating shaft (3) and connected to the end of the screw conveyor housing (1), and a cutting component (52) evenly distributed in the driven shaft (4) for detecting the pressure change in the feeding cavity and adaptively stretching and staggered cutting. The outer wall of the rotating shaft (3) is provided with a spiral conveying blade (8) that adaptively adjusts the spiral span and spiral diameter based on the pressure change in the feeding cavity.

2. The screw conveyor for plastic parts injection molding according to claim 1, characterized in that: The auxiliary feeding assembly comprises a feeding cone barrel (12), a transmission mechanism (13) and a stirring assembly (14), and the feeding cone barrel (12) is installed through the upper end of the screw conveyor housing (1), and the stirring assembly (14) is installed inside the feeding cone barrel (12); A transmission mechanism (13) is installed between the stirring assembly (14) and the screw conveyor housing (1).

3. The screw conveyor for plastic parts injection molding according to claim 2, characterized in that: The stirring assembly (14) includes a stirring blade disposed in the feeding opening of the feeding cone barrel (12) and a stirring shaft penetrating the feeding cone barrel (12) for driving the stirring blade to continuously rotate; The transmission mechanism (13) includes pulleys fixed to the outer wall of the output rotor (2) and the outer wall of the stirring shaft, respectively, and a belt for connecting the two pulleys.

4. The screw conveyor for plastic parts injection molding according to claim 1, characterized in that: A rectangular slide groove is provided inside the output rotor (2), and one end of a T-shaped slide bar (21) is provided in a sliding matching manner inside the rectangular slide groove, and the other end of the T-shaped slide bar (21) passes through the output rotor (2) and is fixedly connected to the end of the rotating shaft (3).

5. The screw conveyor for plastic parts injection molding according to claim 1, characterized in that: The interior of the driven shaft (4) is evenly provided with a limiting cavity groove (5), and one end of a first spring (51) is symmetrically welded to the inner wall of the limiting cavity groove (5), and the other end of the first spring (51) is fixed to the end of the cutting component (52).

6. The screw conveyor for plastic parts injection molding according to claim 5, characterized in that: The cutting assembly (52) is composed of a rectangular seat that is slidably matched with the limiting cavity (5) and a cutting blade that is fixedly connected to the rectangular seat; The outer wall of the rotating shaft (3) is provided with a blade slot (31) which is slidably adapted to the cutting blade and is offset from the limiting cavity (5).

7. The screw conveyor for plastic parts injection molding according to claim 6, characterized in that: The blade slits (31) are evenly arranged in the area not covered by the spiral conveying blades (8) on the outer wall of the rotating shaft (3).

8. The screw conveyor for plastic parts injection molding according to claim 1, characterized in that: A fixed disk (6) is provided on the sliding sleeve of the outer wall of the end of the rotating shaft (3) close to the output rotor (2), and the outer edge of the fixed disk (6) is fixed to the inner wall of the feeding cavity of the screw conveyor housing (1); The end of the rotating shaft (3) away from the output rotor (2) is fixedly connected to a sliding disk (7); Two ends of the spiral conveying blade (8) are respectively fixed to one side of the fixed disk (6) and one side of the sliding disk (7).

9. The screw conveyor for plastic parts injection molding according to claim 8, characterized in that: The spiral conveying blade (8) is slidably connected to the rotating shaft (3), and the radius of the spiral conveying blade (8) is adapted to the feeding inner cavity of the screw conveyor housing (1); The spiral conveying blade (8) is made of elastic metal; A second spring (9) is provided between the sliding plate (7) and the end of the feeding cavity; One end of the second spring (9) is welded to the side wall of the sliding plate (7), and the other end of the second spring (9) is fixed to the inner wall of the end of the feeding cavity.

Images