Melt mixing and distributing device of plastic pipe extrusion die
By introducing a melt rotation mixing zone into the plastic pipe extrusion die, the problem of overheating of the melt material in the spiral groove is solved, resulting in higher yield and lower energy consumption, and reduced manufacturing costs.
Patent Information
- Application Number
- CN202520577372.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-03-28
AI Technical Summary
During the molding process of plastic pipes, the molten material overheats due to prolonged shearing and friction within the spiral groove, affecting the molding quality.
Design a spiral body comprising a diversion section, a spiral section, a mixing section, and a distribution section. The mixing section has a melt rotation mixing zone, which achieves rapid mixing of melt materials through inertial rotation, and shortens the spiral groove length to reduce residence time.
It reduces the risk of overheating of molten material, improves yield, optimizes flow channel design, and reduces energy consumption and manufacturing costs.
Smart Images
Figure CN223918625U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of plastic pipe extrusion technology, specifically relating to a melt mixing and distribution device for a plastic pipe extrusion die. Background Technology
[0002] In the pipe forming process, after the molten material is extruded from the extruder, it first enters the spiral conveying section of the die, where it is squeezed and fused through the spiral structure. Then it enters the die body and is finally extruded into shape.
[0003] To ensure that the molten material can achieve sufficient fusion and distribution during its flow in the spiral groove, traditional designs usually require the spiral body to have a certain axial length, which increases the time the molten material spends in the spiral groove.
[0004] However, as the axial length of the spiral increases, the molten material continues to flow within its spiral grooves. Due to prolonged shearing and friction, the material generates significantly more heat, which can easily lead to overheating and affect the forming quality of the subsequent pipe. Utility Model Content
[0005] This invention addresses the aforementioned problems in the prior art by proposing a melt mixing and distribution device for plastic pipe extrusion dies that can prevent the molten material from overheating within the spiral body.
[0006] This utility model can be achieved through the following technical solutions:
[0007] A melt mixing apparatus for a plastic pipe extrusion die includes:
[0008] The spiral body has two ends that are used to connect to the extruder and the die, respectively, and is used to uniformly transport the molten material extruded by the extruder to the die cavity in a circumferential direction.
[0009] The spiral body is provided with a flow-diverting section, a spiral section, a mixing section, and a distribution section connected sequentially from the inlet end face to the outlet end face, wherein,
[0010] The spiral body has a concave melt rotation mixing zone in the mixing section. The melt material output from the spiral section continues to rotate and flow forward into the melt rotation mixing zone under the action of inertia. The melt materials flowing out from the front and back accumulate in the melt rotation mixing zone and rotate and squeeze each other to achieve mixing.
[0011] As a further improvement of this utility model, the melt rotation mixing zone is formed by an annular groove formed on the surface of the spiral.
[0012] As a further improvement of this utility model, the bottom of the annular groove and the outlet end of the spiral segment are transitioned by a first arc surface.
[0013] As a further improvement of this utility model, the distribution section includes a discharge surface and a second arc surface. The discharge surface is used to communicate with the mold cavity of the mold, and the bottom of the annular groove transitions to the discharge surface through the second arc surface.
[0014] As a further improvement of this utility model, the tilt angle of the first arc surface is greater than the tilt angle of the second arc surface.
[0015] As a further improvement of this utility model, the horizontal distance between the upper and lower ends of the first arc surface is smaller than the horizontal distance between the upper and lower ends of the second arc surface.
[0016] As a further improvement of this utility model, the height of the discharge surface is lower than the height of the uppermost end of the first arc surface.
[0017] As a further improvement of this utility model, the spiral body is provided with multiple feed ports in the diversion section, and the molten material extruded by the extruder is distributed to each of the feed ports through the main feed port;
[0018] The spiral body has several spiral grooves on its outer surface, and each of the feed inlets is connected to the spiral grooves through a diversion channel.
[0019] Compared with the prior art, the present invention has the following beneficial effects:
[0020] 1. Reduced risk of overheating: Compared with the traditional design that relies on increasing the axial length of the spiral to ensure full mixing of materials, the self-rotation mixing method adopted in this application reduces the residence time of materials in the spiral groove, reduces overheating caused by long-term shearing and friction, thereby protecting material properties and improving yield.
[0021] 2. Optimize flow channel design: By designing a reasonable flow channel, the resistance of materials during the transmission process is reduced, which not only helps to maintain the flowability of materials, but also reduces energy consumption and improves production efficiency.
[0022] 3. Reduced manufacturing costs: By shortening the length of the spiral groove and the total length of the spiral body, the manufacturing cost of the mold is effectively reduced. Attached Figure Description
[0023] Figure 1 This is a cross-sectional view of the spiral body and mold of this utility model after assembly;
[0024] Figure 2 This is a cross-sectional view of the helix of this utility model;
[0025] Figure 3 This is the utility model Figure 2 A magnified view of a section at point A in the middle;
[0026] Figure 4 This is a cross-sectional view of a helix in the prior art.
[0027] In the diagram, 100 is the spiral body; 110 is the diversion section; 111 is the sub-feed inlet; 112 is the main feed inlet; 120 is the spiral section; 121 is the spiral groove; 130 is the mixing section; 131 is the melt rotation mixing zone; 132 is the first arc surface; 140 is the distribution section; 141 is the second arc surface; 142 is the discharge surface; and 200 is the mold. Detailed Implementation
[0028] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.
[0029] like Figures 1-3 As shown, this utility model provides a melt mixing and distributing device for a plastic pipe extrusion die, comprising:
[0030] The spiral 100 has two ends that are connected to the extruder (not shown in the figure) and the die 200, respectively, and is used to uniformly transport the molten material extruded by the extruder to the cavity of the die 200 in a circumferential direction.
[0031] The spiral 100 is provided with a flow-diverting section 110, a spiral section 120, a mixing section 130, and a distribution section 140 connected sequentially from the feed end face to the discharge end face. The design of each part helps to optimize the flow and processing of the molten material at different stages.
[0032] Dividing section 110: The single strand of melt material extruded by the extruder is evenly distributed into multiple strands in the dividing section 110;
[0033] Spiral section 120: The specially designed spiral groove 121 causes the molten material to move in a spiral motion, preparing for more thorough mixing in the subsequent process;
[0034] Mixing section 130: It is provided with a concave melt rotation mixing zone 131. The melt material output from the spiral section 120 continues to rotate and flow forward into the melt rotation mixing zone 131 under the action of inertia. The melt materials flowing out from the front and back accumulate in the melt rotation mixing zone 131 and rotate and squeeze each other to achieve mixing.
[0035] Distribution section 140: The melt material mixed in the mixing section 130 enters the mold cavity of the mold 200 through the distribution section 140.
[0036] It should be noted here that, as Figure 4As shown, the existing spiral 100 only includes a flow-diverting section 110 and a spiral section 120. In order to ensure that the melt material can achieve sufficient fusion and distribution during the flow process in the spiral groove 121, the traditional design usually requires the spiral 100 to have a certain axial length to increase the time of the melt material in the spiral groove 121. However, as the axial length of the spiral 100 increases, when the melt material continues to flow in its spiral groove 121, the heat generated by the material increases significantly due to the long-term shearing and friction, which easily leads to overheating and affects the forming quality of the subsequent pipe.
[0037] To address the aforementioned issues, the spiral 100 provided in this embodiment is equipped with a mixing section 130 and a distribution section 140. The key feature is the design of the mixing section 130. Specifically, after the molten material is output from the spiral section 120, it rotates and compresses against each other within the melt rotation mixing zone 131 of the mixing section 130 due to inertia, achieving more thorough mixing. Through this mixing mechanism, the axial length of the spiral section 120 can be significantly shortened while ensuring or even improving the mixing effect of the molten material. A shorter spiral section 120 means that the molten material experiences less shearing and friction time within it, thereby effectively reducing the heat accumulation caused by prolonged flow within the spiral section 120.
[0038] Overall, the melt mixing and dispensing apparatus provided in this embodiment has at least the following advantages:
[0039] 1. Reduced risk of overheating: Compared with the traditional design that relies on increasing the axial length of the spiral body 100 to ensure sufficient mixing of materials, the self-rotation mixing method adopted in this application reduces the residence time of materials in the spiral groove 121, reduces the overheating phenomenon caused by long-term shearing and friction, thereby protecting the material properties and improving the yield.
[0040] 2. Optimize flow channel design: By designing a reasonable flow channel, the resistance of materials during the transmission process is reduced, which not only helps to maintain the flowability of materials, but also reduces energy consumption and improves production efficiency.
[0041] 3. Reduced manufacturing costs: By shortening the length of the spiral groove and the total length of the spiral body, the manufacturing cost of the mold is effectively reduced.
[0042] Preferably, the melt rotation mixing zone 131 is formed by an annular groove formed on the surface of the spiral 100, and the bottom of the annular groove and the outlet end of the spiral segment 120 are connected by a first arc surface 132.
[0043] Preferably, the distribution section 140 includes a discharge surface 142 and a second arc surface 141. The discharge surface 142 is used to communicate with the mold cavity of the mold 200, and the bottom of the annular groove is transitioned to the discharge surface 142 through the second arc surface 141.
[0044] In other words, the transition between the spiral section 120 and the mixing section 130, and between the mixing section 130 and the distribution section 140, is achieved through curved surfaces to ensure smoother flow of the molten material. Furthermore, the specific design details of the first curved surface 132 and the second curved surface 141 are as follows:
[0045] 1. The tilt angle of the first arc surface 132 is greater than the tilt angle of the second arc surface 141:
[0046] This design allows the molten material to quickly enter the mixing section 130 through the first arc surface 132 when it flows out of the spiral section 120. At the same time, the second arc surface 141 between the mixing section 130 and the distribution section 140 slows down the outflow speed of the molten material. By controlling the angle difference between the first arc surface 132 and the second arc surface 141, not only is the speed at which the material enters the mixing section 130 accelerated, but the residence time of the material in the mixing section 130 is also effectively extended, promoting a better rotary extrusion fusion effect.
[0047] 2. The horizontal distance between the upper and lower ends of the first arc surface 132 is less than the horizontal distance between the upper and lower ends of the second arc surface 141:
[0048] Because the horizontal distance between the upper and lower ends of the first arc surface 132 is relatively short, this design allows the molten material to enter the mixing section 130 more quickly when it flows out of the spiral section 120. The shorter horizontal distance, combined with the larger tilt angle, helps to quickly guide the material into the melt rotation mixing zone 131 and reduce the residence time of the material in the transition zone.
[0049] The combined effect of the longer horizontal distance and smaller tilt angle of the second arc surface 141 further slows down the speed at which the material flows from the mixing section 130 to the distribution section 140. This design provides the molten material with more time to rotate, extrude and fuse within the molten self-rotating mixing zone 131, thereby significantly improving the mixing uniformity.
[0050] 3. The height of the discharge surface 142 is lower than the height of the uppermost point of the first arc surface 132:
[0051] This height difference design takes into account the flow characteristics of the melt, which helps to ensure that the melt material enters the mold cavity of the mold 200 under damping conditions and avoids the occurrence of stagnation.
[0052] Preferably, the spiral body 100 is provided with multiple feed ports 111 in the diversion section 110, and the molten material extruded by the extruder is distributed to each feed port 111 through the main feed port 112;
[0053] The spiral body 100 has several spiral grooves 121 on its outer surface. Each feed port is connected to the spiral grooves 121 through a diversion channel. After the molten material flows out of the spiral grooves 121, it enters the mixing section 130 for extrusion and fusion due to inertial rotation. Finally, it flows out from the discharge surface 140 and enters the mold cavity of the mold 200.
[0054] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.
[0055] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0056] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0057] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.
[0058] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.
Claims
1. A melt mixing and distribution device for a plastic pipe extrusion die, characterized by, The application relates to a spiral body for an injection molding machine. The spiral body comprises a feeding end and an output end, and is used for uniformly delivering molten material extruded by an extruder to a mold cavity of a mold. The spiral body comprises a distribution section, a spiral section, a mixing section and a distribution section from the feeding end to the output end. The spiral body is provided with a melt self-rotation mixing area in the mixing section.
2. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 1, characterized in that The melt self-rotation mixing area is formed by an annular groove on the surface of the spiral body.
3. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 2, wherein The bottom of the annular groove and the outlet end of the spiral section are connected by a first arc surface.
4. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 3, wherein The distribution section comprises an output surface and a second arc surface.
5. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 4, wherein The annular groove is connected to the output surface by the second arc surface.
6. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 4, wherein The inclination angle of the first arc surface is larger than that of the second arc surface.
7. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 4, wherein The horizontal distance between the upper and lower ends of the first arc surface is smaller than that of the second arc surface.
8. A melt mixing and distribution device for a plastic pipe extrusion die according to claim 1, wherein The height of the output surface is lower than that of the upper end of the first arc surface. The spiral body is provided with a plurality of distribution feeding ports in the distribution section. The extruded melt material is distributed to each distribution feeding port through a total feeding port. Each feeding port is connected to a spiral groove through a distribution channel.