PE winding pipe double-extruder co-extrusion runner structure

Abstract

The utility model relates to a PE winding pipe double-extruder co-extrusion runner structure which comprises a confluence pipe and two branch pipes, the input end of the confluence pipe is connected to the output ends of the two branch pipes, the output end of the confluence pipe is connected to a forming assembly, the input ends of the two branch pipes are connected to the output ends of the two extruders of the same model respectively, and the output ends of the two extruders are connected to the forming assembly. The co-extrusion runner structure further comprises a confluence block and two adapters, the confluence block is provided with an outlet and two inlets, the confluence pipe and the branch pipes are communicated through the confluence block, the outlet of the confluence block is connected with the input end of the confluence pipe, the two inlets are respectively connected with the output ends of the two branch pipes, and the two adapters are respectively connected with the input end of the confluence pipe. And the two adapters are respectively arranged between the input ends of the two branch pipes and the corresponding extruders. Compared with the prior art, by designing the confluence pipe and the two branch pipes, co-extrusion of the two extruders is achieved, and the diameter of the PE winding pipe can be increased.

Description

Technical Field

[0001] The utility model relates to the field of extruders, in particular to a co-extrusion flow channel structure of a double extruder of a PE winding pipe. Background Art

[0002] With the large-scale development of new pipe gallery projects, the demand for large-diameter PE pipes has increased significantly, and the share of large-diameter PE winding pipes exceeds 50%. With the increase in the diameter of the winding pipe, the required extrusion volume also needs to be greatly increased or even doubled. It is necessary to use two extruders of the same or different specifications for co-extrusion to meet the required large extrusion volume requirements. For this reason, some existing technologies achieve a perfect fusion of the performance of the two extruders by designing a co-extrusion flow channel, thereby increasing the extrusion volume.

[0003] However, simply merging the two extruders cannot achieve consistency. The flow and pressure on both sides are different during mixing, resulting in a low yield rate of the final molded product.

[0004] In order to solve the problem of consistency, some improved solutions adopt the mirror design of two extruders and two co-extrusion runners. Some solutions even combine some melt pressure sensors to detect pressure to improve the mirror rate and thus solve the problem of low yield rate. However, in the actual production process, even with the mirror design method, the yield rate is still not as good as that of a single large extruder. Summary of the invention

[0005] The utility model aims to provide a PE winding pipe double extruder co-extrusion flow channel structure, by designing a confluence pipe and two branch pipes, to achieve co-extrusion of two extruders, can increase the diameter of the PE winding pipe.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A PE winding pipe double extruder co-extrusion flow channel structure, comprising a confluence pipe and two branch pipes, wherein the input end of the confluence pipe is connected to the output ends of the two branch pipes, the output ends are connected to a molding assembly, the input ends of the two branch pipes are respectively connected to the output ends of two extruders of the same model, the co-extrusion flow channel structure also comprises a confluence block and two adapters, the confluence block is provided with an outlet and two inlets, the confluence pipe and the branch pipes are connected through the confluence block, the outlet of the confluence block is connected to the input end of the confluence pipe, the two inlets are respectively the output ends of the two branch pipes, and the two adapters are respectively arranged between the input ends of the two branch pipes and the corresponding extruders.

[0008] The structures of the two branch pipes are symmetrical.

[0009] The branch pipe comprises a fluid compression section, a fluid relaxation section and a main channel section, wherein a spiral baffle is arranged in the main channel section, and the projection area of ​​the baffle on a radial section of the branch pipe is in a circular ring shape, wherein the radial section is perpendicular to the axis of the branch pipe.

[0010] The baffles in the two branch pipes have opposite rotation directions.

[0011] The ratio of the difference between the inner diameter and the outer diameter of the projection area of ​​the baffle on a radial cross section of the branch pipe to the outer diameter is greater than 50%.

[0012] A circular columnar stopper is provided in the fluid compression section, and the outer side of the stopper is supported on the inner wall of the branch pipe.

[0013] The converging pipe and the branching pipe are both arranged obliquely, and the axes of the converging pipe and the branching pipe are in the same plane.

[0014] The included angle between the axes of the two branch pipes is greater than 90 degrees.

[0015] A melting pressure sensor is arranged in the adapter.

[0016] A control method for the co-extrusion flow channel structure as described above comprises:

[0017] Obtain the data collected by two melt pressure sensors and analyze them to obtain the extrusion pressure of the two extruders;

[0018] Based on the extrusion pressures of the two extruders, it is determined whether the pressure difference exceeds a first set threshold value, and if so, the two extruders are controlled to reduce the output synchronously;

[0019] Based on the extrusion pressures of the two extruders, determine whether the pressure difference exceeds a second set threshold. If so, generate a deviation ratio based on the pressure difference, and control the extruder with a larger extrusion pressure to reduce the output based on the deviation ratio, wherein the second set threshold is greater than the first set threshold.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] 1. By designing a confluence pipe and two branch pipes, co-extrusion of two extruders can be achieved, which can increase the diameter of the PE winding pipe.

[0022] 2. By designing the branch pipe to include a fluid compression section, a fluid relaxation section and a main channel section, and providing a spiral baffle in the main channel section, the projection area of ​​the baffle on a radial section of the branch pipe is in a circular ring shape, and a circular cylindrical baffle is provided in the fluid compression section, the outer side of the baffle is supported on the inner wall of the branch pipe, so that the stress of the fluid can be eliminated, so that the physical parameters of all aspects of the fluid in the two branch pipes entering the confluence block are completely consistent, thereby improving the yield rate.

[0023] 3. The angle between the axes of the two branch pipes is greater than 90 degrees, which can reduce the flow velocity along the axial direction of the confluence pipe, reduce the axis difference, and improve the yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a co-extrusion flow channel structure of the utility model from a side view;

[0025] Figure 2 It is a schematic diagram of a co-extrusion flow channel structure of the utility model from a top view;

[0026] Figure 3 is a schematic diagram of the axial section of the branch pipe;

[0027] Wherein: 1. mold, 2. filter tube, 3. confluence pipe, 4. confluence block, 5. branch pipe, 6. adapter, 5-1. baffle, 5-2. baffle. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and a specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "proximal", "distal", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Physical quantities in formulas, if not separately marked, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0031] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] A PE winding pipe double extruder co-extrusion flow channel structure, such as Figure 1 and Figure 2 As shown, it includes a confluence pipe 3 and two branch pipes 5, the input end of the confluence pipe 3 is connected to the output ends of the two branch pipes 5, the output ends are connected to the molding assembly, the input ends of the two branch pipes 5 are respectively connected to the output ends of two extruders of the same model, and the co-extrusion flow channel structure also includes a confluence block 4 and two adapters 6, the confluence block 4 is provided with an outlet and two inlets, the confluence pipe 3 and the branch pipes 5 are connected through the confluence block 4, the outlet of the confluence block 4 is connected to the input end of the confluence pipe 3, the two inlets are respectively the output ends of the two branch pipes 5, and the two adapters 6 are respectively arranged between the input ends of the two branch pipes 5 and the corresponding extruders.

[0034] By designing the confluence pipe 3 and the two branch pipes 5, co-extrusion of two extruders is realized, and the diameter of the PE winding pipe can be increased.

[0035] Generally, and in accordance with the prior art, the structures of the two branch pipes 5 are symmetrical, but in particular, as Figure 3 As shown, the branch pipe 5 includes a fluid compression section, a fluid relaxation section and a main channel section, and a spiral baffle 5-1 is provided in the main channel section. The projection area of ​​the baffle 5-1 on a radial section of the branch pipe 5 is annular, wherein the radial section is perpendicular to the axis of the branch pipe 5. The rotation directions of the baffles 5-1 in the two branch pipes 5 are opposite. The ratio of the difference between the inner diameter and the outer diameter of the projection area of ​​the baffle 5-1 on a radial section of the branch pipe 5 to the outer diameter is greater than 50%.

[0036] In addition, in some embodiments, a circular cylindrical stopper is provided in the fluid compression section, and the outer side of the stopper is supported on the inner wall of the branch pipe 5 .

[0037] By designing the branch pipe 5 to include a fluid compression section, a fluid relaxation section and a main channel section, and providing a spiral baffle 5-1 in the main channel section, the baffle 5-1 has a circular ring-shaped projection area on a radial cross-section of the branch pipe 5, and a circular columnar baffle is provided in the fluid compression section, the outer side of the baffle is supported on the inner wall of the branch pipe 5, so that the stress of the fluid can be eliminated, so that the physical parameters of all aspects of the fluid in the two branch pipes 5 entering the confluence block 4 are completely consistent, thereby improving the yield rate.

[0038] Under normal circumstances, the confluence pipe 3 and the branch pipe 5 are both inclined, and the axes of the confluence pipe 3 and the branch pipe 5 are in the same plane. Figure 1 As shown, the height of the input end is greater than the height of the output end.

[0039] In addition, in some embodiments, the angle between the axes of the two branch pipes 5 is greater than 90 degrees, which can reduce the flow velocity along the axial direction of the confluence pipe 3, reduce the axis difference, and improve the yield rate.

[0040] In addition, a melting pressure sensor is provided in the adapter 6 .

Claims

1. A PE winding pipe double extruder co-extrusion flow channel structure, comprising a confluence pipe (3) and two branch pipes (5), wherein the input end of the confluence pipe (3) is connected to the output ends of the two branch pipes (5), the output ends are connected to a molding assembly, and the input ends of the two branch pipes (5) are respectively connected to the output ends of two extruders of the same model, characterized in that: The co-extrusion flow channel structure also includes a confluence block (4) and two adapters (6). The confluence block (4) is provided with an outlet and two inlets. The confluence pipe (3) and the branch pipe (5) are connected through the confluence block (4). The outlet of the confluence block (4) is connected to the input end of the confluence pipe (3). The two inlets are respectively the output ends of the two branch pipes (5). The two adapters (6) are respectively arranged between the input ends of the two branch pipes (5) and the corresponding extruders.

2. A PE winding pipe double extruder co-extrusion flow channel structure according to claim 1, characterized in that: The structures of the two branch pipes (5) are symmetrical.

3. A PE winding pipe double extruder co-extrusion flow channel structure according to claim 2, characterized in that: The branch pipe (5) comprises a fluid compression section, a fluid relaxation section and a main channel section, wherein a spiral baffle (5-1) is provided in the main channel section, and the projection area of ​​the baffle (5-1) on a radial section of the branch pipe (5) is in the shape of a circular ring, wherein the radial section is perpendicular to the axis of the branch pipe (5).

4. A PE winding pipe double extruder co-extrusion flow channel structure according to claim 3, characterized in that: The baffles (5-1) in the two branch pipes (5) have opposite rotation directions.

5. The PE winding pipe double extruder co-extrusion flow channel structure according to claim 3, characterized in that: The ratio of the difference between the inner diameter and the outer diameter of the projection area of ​​the baffle (5-1) on a radial cross section of the branch pipe (5) to the outer diameter is greater than 50%.

6. A PE winding pipe double extruder co-extrusion flow channel structure according to claim 3, characterized in that: A circular cylindrical stopper is provided in the fluid compression section, and the outer side of the stopper is supported on the inner wall of the branch pipe (5).

7. The PE winding pipe double extruder co-extrusion flow channel structure according to claim 1, characterized in that: The converging pipe (3) and the branching pipe (5) are both arranged at an inclination, and the axes of the converging pipe (3) and the branching pipe (5) are in the same plane.

8. The PE winding pipe double extruder co-extrusion flow channel structure according to claim 1, characterized in that: The included angle between the axes of the two branch pipes (5) is greater than 90 degrees.

9. A PE winding pipe double extruder co-extrusion flow channel structure according to any one of claims 1 to 7, characterized in that: A melting pressure sensor is arranged inside the adapter (6).

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