Screw for efficient pipe production
By optimizing the screw's structural design, including adjusting the length of the plasticizing section and the thread helix angle, the problem of low production efficiency at high speeds was solved, achieving efficient plasticizing and high-volume pipe production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU JWELL PRECISION MACHINERY
- Filing Date
- 2025-07-03
- Publication Date
- 2026-06-09
AI Technical Summary
Existing screws are difficult to improve production efficiency at high speeds, resulting in reduced material plasticization and poor pressure resistance and tensile properties of the pipes.
Design a screw for high-efficiency pipe production, including a feeding section, a plasticizing section and an extrusion section. The length of the plasticizing section is greater than that of the feeding section and the extrusion section. The helix angle of the thread structure is increased in the feeding section. The plasticizing section is equipped with a liquid phase tank and a solid phase tank. The extrusion section is equipped with a barrier and a mixing section. The thread structure is optimized to improve plasticizing quality and output.
Maintaining high plasticizing quality under high speed and high output meets the needs of high-speed and high-efficiency production, and improves the plasticizing capacity and output of pipes.
Smart Images
Figure CN224335011U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of production equipment for plastic pipe products, and in particular to a screw for high-efficiency pipe production. Background Technology
[0002] The screw is a crucial component in plastic extrusion molding. Its length-to-diameter ratio, thread structure, and screw speed all affect the plasticizing effect of the raw material and the extruder's output. With increasing market demand, existing screws struggle to improve production efficiency at high speeds, and the plasticizing effect on materials decreases, resulting in pipes with poor pressure resistance and tensile strength. To improve screw production efficiency and product quality, the current trend in plastic pipe extruders is to increase the length of the plasticizing section, increase screw speed, and deepen the screw channel. While a longer plasticizing section prolongs material residence time, and increased screw speed effectively increases output but cannot guarantee plasticizing quality, deeper screw channels reduce forward conveying efficiency. Therefore, the screw's thread structure needs to be designed to ensure material plasticizing quality while improving output and efficiency. Summary of the Invention
[0003] In order to solve the above-mentioned technical problems, the purpose of this application is to provide a screw for efficient pipe production.
[0004] To achieve the above objectives, this application adopts the following technical solution: a screw for high-efficiency pipe production, comprising a rod extending in a front-to-back direction and a thread extending helically from front to back along the rod. The rod, from front to back, consists of a feeding section, a plasticizing section, and an extrusion section. The length of the plasticizing section is greater than the length of the feeding section, the length of the feeding section is greater than the length of the extrusion section, and the length of the plasticizing section is greater than half the length of the rod. The thread has a constant outer diameter and is arranged in the feeding section and the plasticizing section. The helix angle of the thread increases from front to back in the feeding section, and the depth of the groove formed by the thread in the feeding section gradually decreases from front to back. A helically extending liquid phase groove is formed in the plasticizing section, dividing the thread into... The plasticizing section comprises a main edge and a secondary edge, and includes a long separation segment and a short separation segment connected sequentially from front to back. The length of the long separation segment is greater than the length of the short separation segment. The main edge and the secondary edge converge at the front end of the long separation segment, at the junction of the long separation segment and the short separation segment, and at the rear end of the short separation segment. The volume of the liquid phase tank gradually increases from front to back in the long separation segment and the short separation segment, respectively. The extrusion section comprises a barrier segment and a mixing segment connected sequentially from front to back. The barrier segment has several slots extending spirally along the rod body. The mixing segment has several mixing groups spaced apart from front to back. Each mixing group includes several mixing protrusions arranged sequentially along the circumference of the rod body.
[0005] In the above technical solution, it is further preferred that the bottom diameter of the feeding section increases from front to back.
[0006] In the above technical solution, it is further preferred that the helix angle of the thread of the feed section is 17.7°-23°.
[0007] In the above technical solution, more preferably, the rear end face of the main edge and the front end face of the secondary edge define the liquid phase tank, and the rear end face of the secondary edge and the front end face of the main edge define the solid phase tank; the volume of the solid phase tank gradually decreases from front to back in the long separation segment and the short separation segment, respectively.
[0008] In the above technical solution, a further preferred embodiment is that the long separation section includes a front half connected to the feeding section and a rear half connected to the short separation section. In the front half of the long separation section, the widths of the solid phase tank and the liquid phase tank remain constant from front to back. In the rear half of the long separation section, the width of the solid phase tank gradually decreases from front to back, and the width of the liquid phase tank gradually increases from front to back. In the short separation section, the width of the solid phase tank gradually decreases from front to back, and the width of the liquid phase tank gradually increases from front to back.
[0009] In the above technical solution, more preferably, in the long separation segment, the helix angle of the main edge remains constant from front to back; in the first half of the long separation segment, the helix angle of the secondary edge is equal to the helix angle of the main edge; in the second half of the long separation segment, the helix angle of the secondary edge is greater than the helix angle of the main edge; in the short separation segment, the helix angle of the secondary edge is greater than the helix angle of the main edge, and the helix angle of the secondary edge in the short separation segment is less than the helix angle of the main edge in the long separation segment.
[0010] In the above technical solution, it is further preferred that the helix angle of the secondary edge is 26.8°-32.5° and the helix angle of the primary edge is 23°-28°.
[0011] In the above technical solution, it is further preferred that the length of the barrier segment is greater than the length of the mixing segment.
[0012] In the above technical solution, a further preferred embodiment is that the plurality of slots include a plurality of intermediate slots spaced apart along the circumference of the rod, a plurality of feed slots and a plurality of discharge slots parallel to the intermediate slots, and the feed slots and discharge slots arranged along the same center line between two adjacent intermediate slots. In the rotation direction of the screw, each feed slot forms a protruding first barrier with the downstream intermediate slot, and each discharge slot forms a protruding second barrier with the upstream intermediate slot.
[0013] In the above technical solution, it is further preferred that the mixing protrusions of two adjacent mixing groups are arranged alternately in the circumferential direction of the rod.
[0014] Compared with the prior art, this application achieves the following beneficial effects:
[0015] This application ensures that the screw maintains high plasticizing quality while achieving high speed and high output, meeting the current demand for high-speed and high-efficiency production. Through structural optimization of the screw, it ensures that the plasticizing capacity and output of the screw are further enhanced without increasing the screw length or energy consumption. Attached Figure Description
[0016] Figure 1 This application provides a schematic diagram of the structure of a screw used in high-efficiency pipe production.
[0017] Figure 2 for Figure 1 A schematic diagram of the feeding section in the middle;
[0018] Figure 3 for Figure 1 A schematic diagram of the plasticizing section in the middle;
[0019] Figure 4 for Figure 1 A schematic diagram showing the unfolded feeding section and plasticizing section;
[0020] Figure 5 for Figure 1 A schematic diagram of the barrier segmentation structure;
[0021] Figure 6 for Figure 5 A schematic diagram showing the unfolded barrier segments;
[0022] Figure 7 for Figure 1 A schematic diagram of the mixing section in the process;
[0023] Figure 8 For along Figure 7 A sectional view cut along line AA.
[0024] Wherein: 100, screw; 1, rod body; 11, feeding section; 12, plasticizing section; 121, long separation section; 122, short separation section; 13, extrusion section; 131, barrier section; 132, mixing section; 2, thread; 21, main edge; 22, secondary edge; 31, liquid phase tank; 32, solid phase tank; 41, intermediate tank; 42, feeding tank; 43, discharge tank; 44, first barrier; 45, second barrier; 5, mixing group; 51, mixing protrusion. Detailed Implementation
[0025] To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.
[0026] This application provides a screw for high-efficiency pipe production, such as... Figure 1 As shown, the screw 100 includes a rod body 1 extending in the front-to-back direction and a thread 2 extending helically from front to back along the rod body 1. The rod body 1 consists of a feeding section 11, a plasticizing section 12, and an extrusion section 13 from front to back. The thread 2 is arranged in the feeding section 11 and the plasticizing section 12, and the outer diameter of the thread 2 remains constant from front to back. During the rotation of the screw 100, the material is conveyed forward on the screw 100 by the thread 2 and melted and plasticized under the shearing of the thread 2.
[0027] Among them, the length L2 of the plasticizing section 12 is greater than the length L1 of the feeding section 11, the length L1 of the feeding section 11 is greater than the length L3 of the extrusion section 13, and the length L2 of the plasticizing section 12 is greater than 1 / 2 of the length L of the rod body 1. The ultra-long plasticizing section 12 can promote the full melting and plasticization of solid materials and improve the extrusion quality of the screw.
[0028] like Figure 1 , 2 As shown in Figure 4, in the feeding section 11, the helix angle φ1 of the latter half of the feeding section is greater than that of the first half. The increase in the helix angle φ1 increases the width of the groove formed by the thread 2 on the rod body 1. Simultaneously, the bottom diameter d of the rod body 1 increases from front to back, causing the groove depth of the thread 2 in the feeding section 11 to gradually decrease from front to back. The deeper groove in the first part of the feeding section 11 increases the feed rate of the screw 100, while the gradually shallower and wider groove in the second part of the feeding section 11 allows for rapid material compression, improving the forward conveying efficiency of the material and increasing the contact area between the material and the screw, thus enabling rapid preheating of the material and improving the melt conversion efficiency. In this embodiment, the helix angle φ1 is 17.7°-23°. The thread 2 in the feeding section 11 forms a suitable thread lead for material feeding by using a suitable helix angle, thereby increasing the feed rate while ensuring feeding stability.
[0029] like Figure 1 ,3 As shown in Figure 4, a spirally extending liquid phase groove 31 is provided on the thread 2 in the plasticizing section 12. The liquid phase groove 31 divides the thread 2 into a main ridge 21 and a secondary ridge 22 that are spirally extended respectively. The rear end face of the main ridge 21 and the front end face of the secondary ridge 22 define the liquid phase groove 31, and the rear end face of the secondary ridge 22 and the front end face of the main ridge 21 define the solid phase groove 32.
[0030] Plasticizing section 12 includes a long separation section 121 and a short separation section 122 connected to the rear end of the long separation section 121, the length of the long separation section 121 being L. 21 The length L of the short segment 122 is greater than the length of the short segment. 22 The main edge 21 and the secondary edge 22 converge at the front end of the long separation segment 121, at the junction of the long separation segment 121 and the short separation segment 122, and at the rear end of the short separation segment 122, respectively, so that the volume of the liquid phase tank 31 gradually increases from front to back in the long separation segment 121 and the short separation segment 122; the volume of the solid phase tank 32 gradually decreases from front to back in the long separation segment 121 and the short separation segment 122.
[0031] In the long separation section 121, the helix angle φ2 of the main rib 21 remains constant from front to back. The long separation section 121 includes a front half connected to the feed section 11 and a rear half connected to the short separation section 122 along the axial direction of the rod. In the front half of the long separation section 121, the helix angle φ3 of the secondary rib 22 is equal to the helix angle φ2 of the main rib 21, so that the width of the solid phase tank 32 and the width of the liquid phase tank 31 in the front half of the long separation section 121 remain constant from front to back. This can increase the heating area of the solid material in the early stage of solid-liquid conversion, accelerate the melting speed, and improve the solid-liquid conversion efficiency.
[0032] In the latter half of the long separation section 121, the helix angle φ3 of the secondary edge 22 is greater than the helix angle φ2 of the primary edge 21. This causes the width of the solid phase tank 32 in the latter half of the long separation section 121 to gradually decrease from front to back, while the width of the liquid phase tank 31 gradually increases from front to back. The increase in the helix angle φ3 of the secondary edge 22 leads to an increase in the lead of the secondary edge 22, allowing the liquid phase tank 31 to obtain a larger screw channel space to accommodate the gradually increasing liquid phase material, accelerating the forward conveying of the material, shortening the residence time of the material on the screw, and effectively controlling the screw temperature rise. The volume changes of the liquid phase tank 31 and the solid phase tank 32 conform to the solid-liquid conversion law of the plasticizing section 12.
[0033] In the short separation section 122, the helix angle φ3 of the secondary edge 22 is greater than the helix angle φ2 of the primary edge 21, and the helix angle φ3 of the secondary edge 22 in the short separation section 122 is less than the helix angle φ2 of the primary edge 21 in the long separation section 121. This results in the width of the solid phase tank 32 in the short separation section 122 gradually decreasing from front to back, while the width of the liquid phase tank 31 gradually increases from front to back. The material is essentially melted into a liquid phase when it enters the short separation section 122, and the short separation section 122 further plasticizes the molten material, improving the plasticizing effect.
[0034] In the embodiments of this application, the helix angle φ3 is 26.8°-32.5°, the helix angle φ2 is 23°-28°, and the main edge 21 and the secondary edge 22 are within the corresponding helix angle range. This can improve the conveying efficiency while ensuring the plasticizing effect on the material, and is especially suitable for high-speed production extrusion equipment.
[0035] like Figure 1 As shown, the extrusion section 13 includes a barrier section 131 and a mixing section 132 connected sequentially from front to back. The length of the barrier section 131 is greater than the length of the mixing section 132.
[0036] like Figure 1 , 5 As shown in Figure 6, the barrier segment 131 has several intermediate grooves 41 extending spirally along the rod body. These intermediate grooves 41 are spaced apart circumferentially along the rod body. Between adjacent intermediate grooves 41, there are feed grooves 42 and discharge grooves 43 distributed along the same axis. Both feed grooves 42 and discharge grooves 43 are parallel to the intermediate grooves 41. In the direction of screw rotation, each feed groove 42 forms a protruding first barrier 44 with the downstream intermediate groove 41, and each discharge groove 43 forms a protruding second barrier 45 with the upstream intermediate groove 41. Material enters the barrier segment 131 from each feed groove 42. During screw rotation, the material crosses the corresponding first barrier 44 from the feed groove 42 into the downstream intermediate groove 41, then crosses the corresponding second barrier 45 from the intermediate groove 41 into the downstream discharge groove 43, and finally exits the barrier segment 131 from the discharge groove 43. The material undergoes high shearing through the gap between the barrier and the barrel twice, further plasticizing it and improving the plasticizing effect. This improves the quality of the final pipe products, ensuring that the various properties of the pipe products meet market demands.
[0037] like Figure 1 , 7As shown in Figure 8, the mixing section 132 has several mixing groups 5 arranged at intervals from front to back. Each mixing group 5 includes several mixing protrusions 51 arranged sequentially along the circumference of the rod 1. The mixing protrusions 51 of two adjacent mixing groups 5 are arranged alternately along the circumference of the rod 1. The staggered arrangement of the mixing protrusions 51 can better disperse and mix the material flow, improve the melt quality, and appropriately reduce the temperature of the melt, eliminating the negative impact of temperature fluctuations.
[0038] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.
Claims
1. A screw for high-efficiency pipe production, comprising a rod extending in a front-to-back direction and a thread extending helically from front to back along said rod, characterized in that, The rod body consists of a feeding section, a plasticizing section, and an extrusion section from front to back. The length of the plasticizing section is greater than the length of the feeding section, and the length of the feeding section is greater than the length of the extrusion section. The length of the plasticizing section is also greater than half the length of the rod body. The threaded outer diameter remains constant in the feeding section and the plasticizing section. The helix angle of the thread increases from front to back in the feeding section, and the depth of the groove formed by the thread in the feeding section gradually decreases from front to back. A spirally extending liquid phase groove is formed in the plasticizing section, dividing the thread into a main edge and a secondary edge. The plasticizing section includes long separation segments and short separation segments connected sequentially from front to back. The segments are divided into sections, with the length of the long separation segment being greater than the length of the short separation segment. The main edge and the secondary edge converge at the front end of the long separation segment, at the junction of the long separation segment and the short separation segment, and at the rear end of the short separation segment. The volume of the liquid phase tank gradually increases from front to back in both the long and short separation segments. The extrusion section includes a barrier segment and a mixing segment connected sequentially from front to back. The barrier segment has several slots extending spirally along the rod body. The mixing segment has several mixing groups spaced apart from front to back. Each mixing group includes several mixing protrusions arranged sequentially along the circumference of the rod body.
2. The screw for high-efficiency pipe production according to claim 1, characterized in that, The bottom diameter of the feed section increases from front to back.
3. The screw for high-efficiency pipe production according to claim 1, characterized in that, The helix angle of the feed section thread is 17.7°-23°.
4. The screw for high-efficiency pipe production according to claim 1, characterized in that, The rear end face of the main ridge and the front end face of the secondary ridge define the liquid phase tank, and the rear end face of the secondary ridge and the front end face of the main ridge define the solid phase tank. The volume of the solid phase tank gradually decreases from front to back in both the long separation section and the short separation section.
5. The screw for high-efficiency pipe production according to claim 4, characterized in that, The long separation section includes a front half connected to the feed section and a rear half connected to the short separation section. In the front half of the long separation section, the width of the solid phase tank and the width of the liquid phase tank remain constant from front to back. In the latter half of the long separation section, the width of the solid phase tank gradually decreases from front to back, while the width of the liquid phase tank gradually increases from front to back; in the short separation section, the width of the solid phase tank gradually decreases from front to back, while the width of the liquid phase tank gradually increases from front to back.
6. The screw for high-efficiency pipe production according to claim 5, characterized in that, In the long separation segment, the helix angle of the main edge remains constant from front to back; in the first half of the long separation segment, the helix angle of the secondary edge is equal to the helix angle of the main edge; in the second half of the long separation segment, the helix angle of the secondary edge is greater than the helix angle of the main edge. In the short separation segment, the helix angle of the secondary edge is greater than that of the primary edge, and the helix angle of the secondary edge in the short separation segment is less than that of the primary edge in the long separation segment.
7. The screw for high-efficiency pipe production according to claim 6, characterized in that, The helix angle of the secondary edge is 26.8°-32.5°, and the helix angle of the primary edge is 23°-28°.
8. The screw for high-efficiency pipe production according to claim 1, characterized in that, The length of the barrier segment is greater than the length of the mixing segment.
9. The screw for high-efficiency pipe production according to claim 1, characterized in that, The plurality of slots include a plurality of intermediate slots spaced apart along the circumference of the rod, a plurality of feed slots and a plurality of discharge slots parallel to the intermediate slots, and feed slots and discharge slots arranged along the same center line between two adjacent intermediate slots. In the rotation direction of the screw, each feed slot forms a protruding first barrier with the downstream intermediate slot, and each discharge slot forms a protruding second barrier with the upstream intermediate slot.
10. The screw for high-efficiency pipe production according to claim 1, characterized in that, The mixing protrusions of two adjacent mixing groups are arranged alternately around the circumference of the rod.