Building block type screw head uniform in glue melting and good in non-return effect

Abstract

A building block type screw head uniform in glue melting and good in non-return effect comprises a conical head portion and a connecting portion capable of being connected to a plastic machine screw, the connecting portion is movably sleeved with a non-return ring, and a material channel allowing materials to pass through is reserved between the inner wall of the non-return ring and the outer wall of the connecting portion. The end face of the non-return ring can abut against the end face of the head part, a discharging groove capable of being communicated with the material channel is formed in the head part, N mixing rings capable of stirring materials to improve the material plasticizing effect and M filtering rings capable of extruding bubbles and filtering impurities are arranged on the connecting part corresponding to the material channel in a sleeving mode, and N is a natural number larger than 0 and smaller than 20. M is a natural number greater than or equal to 0 and less than 20. The device has the advantages that the material mixing effect is good, the filtering effect of carbonized materials, metal filings and other impurities is good, the mixing effect and the impurity filtering effect can be adjusted according to production requirements, and the application range is wide.

Description

Technical Field

[0001] This invention relates to the field of plastic machine screw technology for injection molding machines or extruders, and more particularly to a modular screw head with good melt uniformity and anti-reverse effect. Background Technology

[0002] Existing plastic injection molding machine screws have the following problems: Traditional check rings, if poorly designed or worn, can easily lead to melt backflow and reverse flow, affecting injection stability and product quality. Some structures do not provide ideal backflow prevention sealing when melt pressure is insufficient. Conventional screw head assemblies are difficult to effectively remove gas during the melt plasticization process, which can easily lead to defects such as gas marks and scorching in the product. Although there are dedicated venting screw assemblies, their structures are usually quite complex and their integration needs to be improved. There is a lack of precise adjustment capabilities for key process parameters such as back pressure, which may lead to problems such as uneven melt temperature and incomplete plasticization. At the same time, general-purpose screw heads are difficult to adapt to all raw materials and processes, and there is insufficient dedicated design for special materials.

[0003] A Chinese utility model patent with patent number CN201920925119.8 entitled "A Screw Head Check Ring" discloses a screw head check ring, which includes a screw head, a sealing ring, a check ring, and a positioning wear-resistant ring. The sealing ring, check ring, and positioning wear-resistant ring are sequentially sleeved on the screw head. The front end of the screw head has a conical structure. A positioning groove is formed on the outer wall of the front end of the screw head. A flow divider groove is formed on the outer wall of the front end of the screw head outside the positioning groove. A boss is provided at the middle position of the screw head. The sealing ring is installed on the screw head behind the boss. In this utility model, the screw head check ring incorporates a positioning wear-resistant ring at the midpoint of the running-in contact between the screw head and the check ring. The positioning wear-resistant ring and the check ring experience smooth planar friction. The positioning wear-resistant ring primarily positions the center of the check ring, thus mitigating rotational running-in force while maintaining the stability of the check ring's outer circumference, reducing rotational damage and damage to the inner bore of the feed tube, resulting in a smooth planar running-in effect. However, this structure does not solve the aforementioned problems; therefore, the structure of this screw head check ring requires further improvement. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a modular screw head that has good material mixing effect, can adjust the mixing effect and impurity filtration effect according to production requirements, has a wide range of applications, and has good melt uniformity and anti-reverse effect, in light of the above-mentioned existing technology.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: This modular screw head with good melt uniformity and anti-reverse effect includes a conical head and a connecting part that can be connected to the screw of a plasticizing machine. An anti-reverse ring is movably fitted on the connecting part. A material channel for material to pass through is left between the inner wall of the anti-reverse ring and the outer wall of the connecting part. The end face of the anti-reverse ring can abut against the end face of the head. A discharge groove that can connect to the material channel is provided on the head. The feature is that: N mixing rings that can stir the material and improve the plasticizing effect and M filter rings that can extrude air bubbles and filter impurities are fitted on the connecting part corresponding to the material channel. N is a natural number greater than 0 and less than 20, and M is a natural number greater than or equal to 0 and less than 20.

[0006] As an improvement, spiral grooves may preferably be distributed on the outer wall of the mixing ring.

[0007] As a further improvement, a sleeve-shaped protrusion can preferably be provided in the middle of the mixing ring to prevent the outer rings of the mixing ring from directly contacting each other.

[0008] As a further improvement, a head protrusion that reduces the contact area with the mixing ring can preferably be provided on the end face of the head.

[0009] As an improvement, the filter ring can preferably be a disc-shaped structure, with a sleeve through hole in the middle of the disc-shaped structure and disc body through holes that can filter impurities distributed at intervals on the end face of the disc-shaped structure.

[0010] As a further improvement, a cylindrical protrusion can preferably be provided in the middle of the filter ring to prevent the outer ring of the filter ring from directly contacting the outer ring of the mixing ring.

[0011] As an improvement, a thrust ring can preferably be provided on the connecting part, and the check ring is sleeved on the connecting part between the head and the thrust ring. This optimizes the fit between the check ring and the screw head, preventing glue backflow and ensuring product dimensional stability and weight consistency.

[0012] As a further improvement, the thrust ring end face corresponding to the check ring can preferably be provided with a tapered surface, and an end face recess that can be adapted to the tapered surface is provided on the end face of the check ring.

[0013] As a further improvement, the outer wall of the thrust ring may preferably have thrust ring spiral grooves distributed at intervals.

[0014] In a further improvement, a threaded section that can be connected to the screw of a plastic injection molding machine can preferably be provided at the end of the connection part, and an annular groove that can prevent stress concentration is provided on the connection part between the threaded section and the thrust ring installation position.

[0015] Compared with the prior art, the advantages of this invention are as follows: N mixing rings and M filter rings are fitted onto the connecting part corresponding to the material channel. The mixing rings can stir the material, thereby improving the plasticizing effect, while the filter rings can squeeze out air bubbles and filter impurities. The number of mixing rings and filter rings can be dynamically adjusted according to actual needs. This structure ensures uniform material color and temperature, effectively eliminating color differences. Simultaneously, the efficient filtration function can fully intercept impurities such as carbonized materials and metal shavings, fundamentally eliminating the problem of black spots on the product surface. The screw head is designed as a freely combinable independent functional module, achieving multi-purpose functionality and flexible adaptation to different processes, significantly reducing spare parts costs and inventory pressure. The mixing rings and filter rings are integrated as standard modules. At the screw head tip, material uniformity is improved, impurities are effectively removed, and high-quality production is balanced with efficient screw head cleaning when materials need to be changed for color. With its superior mixing and filtering functions, the scrap rate caused by color difference, black spots, and impurities can be significantly reduced from 3%–5% to below 0.5%, achieving near-zero-defect high-quality production. The easily disassembled structural design improves plasticizing quality while significantly shortening maintenance time and solving the problem of screw head jamming. By reducing unplanned downtime and component replacement frequency, the overall utilization rate of the injection molding machine is directly improved, allowing the equipment to remain in a high-efficiency production state for longer periods. In summary, this invention integrates mixing, filtering, precision adjustment, and check valve sealing functions into a modular system. Each functional unit can be used as an independent module, freely combined and quickly disassembled like building blocks. This design solves the pain points of traditional screw head assemblies, such as single function, easy backflow, and difficult maintenance, significantly reducing product defect rates, improving production efficiency, and providing advanced process solutions for high-end injection molding. Attached Figure Description

[0016] Figure 1 This is a perspective view of an embodiment of the present invention;

[0017] Figure 2 for Figure 1 Side projection view;

[0018] Figure 3 yes Figure 2 Cross-sectional view along line AA;

[0019] Figure 4 yes Figure 1 Exploded structural diagram;

[0020] Figure 5 yes Figure 4 Further structural decomposition diagram;

[0021] Figure 6 yes Figure 5 A structural breakdown diagram from another perspective;

[0022] Figure 7 yes Figure 5 A three-dimensional view of the mixing ring;

[0023] Figure 8 yes Figure 5 A 3D view of the middle filter ring;

[0024] Figure 9 This is a perspective view of the second embodiment of the present invention;

[0025] Figure 10 yes Figure 9 Side projection view;

[0026] Figure 11 yes Figure 10 Cross-sectional view along the BB line;

[0027] Figure 12 yes Figure 9 Exploded structural diagram;

[0028] Figure 13 yes Figure 12 Further structural decomposition diagram;

[0029] Figure 14 yes Figure 13 A structural breakdown diagram from another perspective. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1 to 8 As shown, the modular screw head of this embodiment, which provides uniform melt flow and good anti-reverse effect, includes a conical head 1 and a connecting part 10 that can be connected to the screw of a plasticizing machine. An anti-reverse ring 2 is movably fitted onto the connecting part 10. A material channel 12 is provided between the inner wall of the anti-reverse ring 2 and the outer wall of the connecting part, allowing material to pass through. The end face of the anti-reverse ring 2 can abut against the end face of the head 1. A discharge groove 11 that connects to the material channel 12 is provided on the head 1. Two mixing rings 3 that can stir the material and improve its plasticizing effect and one filter ring 4 that can extrude air bubbles and filter impurities are fitted onto the connecting part 10 corresponding to the material channel 12. The filter ring 4 is sandwiched between the two mixing rings 3.

[0032] Spiral grooves 31 are distributed on the outer wall of the mixing ring 3. A sleeve-shaped protrusion 32 is provided in the middle of the mixing ring 3 to prevent the outer rings of the mixing ring from directly contacting each other. A head protrusion 13 is provided on the end face of the head 1 to reduce the contact area with the mixing ring 3.

[0033] The filter ring 4 has a disc-shaped structure with a through hole in the middle and through holes 41 for filtering impurities distributed at intervals on the end face of the disc. A cylindrical protrusion 42 is provided in the middle of the filter ring 4 to prevent direct contact between the outer ring of the filter ring and the outer ring of the mixing ring.

[0034] A thrust ring 5 is provided on the connecting part 10, and a check ring 2 is fitted onto the connecting part 10 between the head 1 and the thrust ring 5. A filter ring 4 and two mixing rings 3 are also sandwiched between the head 1 and the thrust ring 5. A tapered surface 52 is provided on the end face of the thrust ring corresponding to the check ring 2, and an end face recess 21 that can be adapted to the tapered surface 52 is provided on the end face of the check ring 2.

[0035] A threaded section that can connect to the screw of a plastic injection molding machine is provided at the end of the connecting part 10, and an annular groove 101 that can prevent stress concentration is provided on the connecting part 10 between the threaded section and the installation position of the thrust ring 5.

[0036] like Figures 9 to 14 As shown, the modular screw head of the second embodiment, which has good melt uniformity and anti-reverse effect, includes a conical head 1 and a connecting part 10 that can be connected to the screw of a plasticizing machine. An anti-reverse ring 2 is movably fitted on the connecting part 10. A material channel 12 is left between the inner wall of the anti-reverse ring 2 and the outer wall of the connecting part, allowing material to pass through. The end face of the anti-reverse ring 2 can abut against the end face of the head 1. A discharge groove 11 that can communicate with the material channel 12 is provided on the head 1. Three mixing rings 3 that can stir the material and improve the plasticizing effect are fitted on the connecting part 10 corresponding to the material channel 12. In this embodiment, a filter ring 4 that can squeeze out air bubbles and filter impurities is not provided.

[0037] Spiral grooves 31 are distributed on the outer wall of the mixing ring 3. A sleeve-shaped protrusion 32 is provided in the middle of the mixing ring 3 to prevent the outer rings of the mixing ring from directly contacting each other. A head protrusion 13 is provided on the end face of the head 1 to reduce the contact area with the mixing ring 3.

[0038] A thrust ring 5 is provided on the connecting part 10, and a check ring 2 is fitted onto the connecting part 10 between the head 1 and the thrust ring 5. After the three mixing rings 3 are fitted onto the connecting part 10 in sequence, they are also sandwiched between the head 1 and the thrust ring 5.

[0039] The thrust ring 2 has a tapered surface 52 on its end face, and a recessed portion 21 that matches the tapered surface 52 is provided on the end face of the check ring 2. Spiral grooves 51 are spaced apart on the outer wall of the thrust ring 5. When the thrust ring 5 is not provided, the check ring 2 directly contacts the end of the plastic injection molding machine screw, which requires a large-diameter section at the end of the screw, increasing the manufacturing difficulty. Therefore, it is usually chosen to provide a thrust ring 5 to cooperate with the check ring 2. The thrust ring 5 can be threaded onto the connecting part, or the inner ring hole of the thrust ring 5 can be spot-welded to the connecting part after being fitted onto the connecting part. Threaded connection is more difficult to manufacture, but it is easier to disassemble the thrust ring 5 to replace the mixing ring 3. Spot welding is more time-consuming. Alternatively, the thrust ring 5 can be fitted onto the connecting part by interference fit, but this method is not as convenient as threaded connection. These specific connection methods are all known technologies and will not be described in detail.

[0040] A threaded section that can connect to the screw of a plastic injection molding machine is provided at the end of the connecting part 10, and an annular groove 101 that can prevent stress concentration is provided on the connecting part 10 between the threaded section and the installation position of the thrust ring 5.

[0041] Working Principle: The modular screw head, while fulfilling its anti-reverse function, enhances the shearing, diversion, filtration, and color mixing of molten materials. Through a specially designed mixing tank and filter mesh, the material flow is disrupted, undergoing a "splitting-overlapping-re-splitting" process to achieve uniform mixing at the microscale. Users can adjust the screw head to meet various customer requirements. For example, if high purity is required, additional filter rings can be added to better prevent impurities from entering the finished product. If the product contains many additives, and the screw alone cannot achieve sufficient mixing, additional mixing rings can be added to agitate and mix the materials. In short, customers can freely combine the components to achieve their desired results.

Claims

1. A modular screw head with good melt uniformity and anti-reverse effect, comprising a conical head (1) and a connecting part (10) that can be connected to a plastic injection molding machine screw, wherein an anti-reverse ring (2) is movably fitted on the connecting part (10), a material channel (12) for material to pass through is provided between the inner wall of the anti-reverse ring (2) and the outer wall of the connecting part, the end face of the anti-reverse ring (2) can abut against the end face of the head (1), and a discharge groove (11) for communicating with the material channel (12) is provided on the head (1), characterized in that: The connecting part (10) corresponding to the material channel (12) is fitted with N mixing rings (3) that can stir the material and improve the plasticizing effect of the material and M filter rings (4) that can squeeze out bubbles and filter impurities. N is a natural number greater than 0 and less than 20, and M is a natural number greater than or equal to 0 and less than 20.

2. The modular screw head according to claim 1, characterized in that: Spiral grooves (31) are distributed on the outer wall of the mixing ring (3).

3. The modular screw head according to claim 2, characterized in that: A sleeve-shaped protrusion (32) is provided in the middle of the mixing ring (3) to prevent the outer rings of the mixing ring from directly contacting each other.

4. The modular screw head according to claim 3, characterized in that: A head protrusion (13) is provided on the end face of the head (1) to reduce the contact area with the mixing ring (3).

5. The modular screw head according to any one of claims 1 to 4, characterized in that: The filter ring (4) has a disc-shaped structure, with a connecting hole in the middle of the disc-shaped structure, and disc body through holes (41) that can filter impurities are distributed at intervals on the end face of the disc-shaped structure.

6. The modular screw head according to claim 5, characterized in that: A cylindrical protrusion (42) is provided in the middle of the filter ring (4) to prevent the outer ring of the filter ring from directly contacting the outer ring of the mixing ring.

7. The modular screw head according to any one of claims 1 to 4, characterized in that: A thrust ring (5) is provided on the connecting part (10), and the anti-reverse ring (2) is sleeved on the connecting part (10) between the head (1) and the thrust ring (5).

8. The modular screw head according to claim 7, characterized in that: The thrust ring end face corresponding to the check ring (2) is provided with a tapered surface (52), and the end face recess (21) that can be adapted to the tapered surface (52) is provided on the end face of the check ring (2).

9. The modular screw head according to claim 7, characterized in that: The outer wall of the thrust ring (5) is provided with thrust ring spiral grooves (51) at intervals.

10. The modular screw head according to claim 7, characterized in that: A threaded section that can be connected to the screw of the plastic injection molding machine is provided at the end of the connecting part (10), and an annular groove (101) that can prevent stress concentration is provided on the connecting part (10) between the threaded section and the installation position of the thrust ring (5).

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