Extruder head filter plate for cable insulation extrusion and extruder

Abstract

The utility model relates to the technical field of wire and cable production, in particular to an extruder head filter plate for cable insulation extrusion and an extruder. The utility model discloses an extruder head filter plate for cable insulation extrusion, which comprises a cylindrical plate body, two sides of the cylindrical plate body are respectively provided with a feeding surface and a discharging surface which are recessed inwards, a plurality of runners are arranged on the cylindrical plate body between the feeding surface and the discharging surface, and the runners comprise an inner circular runner area and an outer strip-shaped runner; the inner circular flow channel area comprises a first circular flow channel area, a second circular flow channel area and a third circular flow channel area from inside to outside, and the diameter D1 of a flow channel hole of the first circular flow channel area, the diameter D2 of a flow channel hole of the second circular flow channel area and the diameter D3 of a flow channel hole of the third circular flow channel area are as follows: D1 is greater than D2 and D3 is greater than D2. The utility model aims to develop the extruder head filter plate which can improve the temperature distribution of an insulating material passing through the filter plate, improve the problem of extrusion and blockage on the filter plate and realize large-length insulating production.

Description

Technical Field

[0001] The utility model relates to the technical field of wire and cable production, in particular to an extruder head filter plate and an extruder used for cable insulation extrusion. Background Art

[0002] Cross-linked polyethylene insulated cables are widely used in the field of power transmission, and now the production of cross-linked polyethylene insulated cables is developing towards long lengths. Part of the purpose of doing so is to reduce the number of joints for large projects and improve the safety and reliability of the entire operating line. It can also represent the production capacity of an enterprise. Cross-linked polyethylene insulation is usually co-extruded in a catenary or vertical production line. The long-length continuous production capacity of insulation is mainly affected by the stability of the equipment structure and the characteristics of the raw materials. Since cross-linked polyethylene cables are cross-linked with diisopropylbenzene peroxide (DCP), the insulation material is heated, pressurized and melted uniformly in the extrusion equipment before being extruded. However, during the extrusion process, the inner layer of the melt rubs against the screw, and the outer layer of the melt rubs against the barrel. Under the action of pressure and local friction, some areas are prone to overheating, even if the temperature of the middle layer of the melt is low, and the temperature of the inner and outer layers is high. Over time, these areas will make the inner and outer layers more likely to cross-link and become blocked on the filter plate, and the insulation material cannot pass through the filter, let alone achieve the production of long-length insulation.

[0003] Therefore, those skilled in the art are committed to developing an extruder head filter plate and extruder for cable insulation extrusion that can improve the temperature distribution of insulating materials passing through the filter plate, improve the blockage problem on the filter plate, and realize the production of long-length insulation. Utility Model Content

[0004] In view of the above-mentioned defects of the prior art, the utility model discloses an extruder head filter plate and an extruder for cable insulation extrusion. The technical problem to be solved is to develop an extruder head filter plate and an extruder for cable insulation extrusion that can improve the temperature distribution of insulating materials passing through the filter plate, improve the blockage problem on the filter plate, and realize the production of long-length insulation.

[0005] To achieve the above-mentioned purpose, the utility model provides an extruder head filter plate for cable insulation extrusion, comprising a cylindrical plate body, wherein two sides of the cylindrical plate body are respectively formed with an inwardly concave feed surface and a discharge surface, and a plurality of flow channels are opened on the cylindrical plate body between the feed surface and the discharge surface, wherein the plurality of flow channels include an inner circular flow channel area and an outer strip flow channel; the inner circular flow channel area includes a first circular flow channel area, a second circular flow channel area and a third circular flow channel area from the inside to the outside, and the sizes of the diameter D1 of the flow channel hole of the first circular flow channel area, the diameter D2 of the flow channel hole of the second circular flow channel area and the diameter D3 of the flow channel hole of the third circular flow channel area are: D1>D2 and D3>D 2， That is, the circular flow channel area is designed as a flow channel with a large-small-large aperture from the inside to the outside, which increases the fluidity of the inner and outer layers of the melt. Multiple layers of flow channels with different apertures can also be set in each circular flow channel area to make more precise adjustments based on the stability of the equipment structure and the characteristics of the raw materials.

[0006] Preferably, the end of the flow channel close to the feed surface is provided with a trumpet-shaped feed port, the end of the flow channel close to the discharge surface is provided with a trumpet-shaped discharge port, and the angle α of the feed port of the same inner flow channel is smaller than the angle β of the discharge port. Thus, the filter plate has a use direction, the feed port angle of the flow channel is gentle when entering the filter plate, and the discharge port angle of the flow channel is large when leaving the filter plate, which is conducive to improving the pressure of the melt when being extruded.

[0007] Preferably, the angle α of the feed port is 25 to 45°, and the angle β of the discharge port is 80 to 95°.

[0008] Preferably, the discharge port at one end of the outer strip-shaped flow channel close to the discharge surface is an arc-shaped transition surface.

[0009] Preferably, the ratio of the length E of the feed port to the length F of the discharge port of the same flow channel is 2.5 to 4.0.

[0010] Preferably, the ratio of the length of the outer strip-shaped flow channel to the width of the outer strip-shaped flow channel is 3 to 3.5. Through the above numerical design, the friction force and pressure can be further accurately offset.

[0011] Preferably, the cylindrical plate body is provided with axial threads for installing the filter plate.

[0012] The utility model also provides an extruder for cable insulation extrusion, comprising the extruder head filter plate for cable insulation extrusion as described above.

[0013] The beneficial effects of the utility model are:

[0014] By designing an inner circular flow channel area and an outer strip flow channel in the filter plate, and by designing the circular flow channel area to change the flow channel hole diameter from large to small to large from the inside to the outside, using different circular and strip flow channel structures, and distributing different flow channel hole diameters according to the flow area, the flow velocity of the flow channel with a larger aperture is faster and smoother, which can offset the friction between the inner layer of the melt and the screw and the outer layer of the melt and the barrel; at the same time, the temperature of the liquid insulating material corresponding to the larger hole is higher, and the temperature corresponding to the smaller hole is lower, so that when the insulating material passes through, it is not easy to produce too large a temperature difference. Thereby, the phenomenon of excessive local melt temperature during the extrusion process can be significantly improved, that is, the temperature distribution of the insulating material passing through the filter plate is improved, and the problem of crowding and blocking on the filter plate is improved, so as to facilitate the production of long-length insulation. Therefore, the filter plate of the utility model can improve the long-term extrusion capacity of cross-linked polyethylene insulation, and the equipment structure is simple, and can be widely used in the long-term extrusion production of cross-linked polyethylene insulated cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of a specific implementation method of the filter plate of the utility model;

[0016] Figure 2 It is a front view schematic diagram of a specific implementation method of the filter plate of the utility model;

[0017] Figure 3 yes Figure 2 A-direction cross-sectional view;

[0018] Figure 4 yes Figure 3 A schematic diagram of the partially enlarged structure at C in the middle;

[0019] Figure 5 yes Figure 2 Schematic diagram of the cross-section along the B axis.

[0020] In the above drawings: 1. cylindrical plate; 2. feed surface; 21. feed port; 3. discharge surface; 31. discharge port; 4. inner circular flow channel area; 41. first circular flow channel area; 42. second circular flow channel area; 43. third circular flow channel area; 5. outer strip flow channel. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific manner, and therefore cannot be understood as a limitation on the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] like Figure 1 and Figure 2 As shown, the utility model provides an extruder head filter plate for cable insulation extrusion, comprising a cylindrical plate body 1, wherein both sides of the cylindrical plate body 1 are respectively formed with an inwardly concave feed surface 2 and a discharge surface 3, and the cylindrical plate body 1 is provided with an axial thread outside for installation of the filter plate. A plurality of flow channels are provided on the cylindrical plate body 1 between the feed surface 2 and the discharge surface 3, and the plurality of flow channels include an inner circular flow channel area 4 and an outer strip flow channel 5; the inner circular flow channel area 4 includes a first circular flow channel area 41, a second circular flow channel area 42 and a third circular flow channel area 43 from inside to outside, and the diameter D1 of the flow channel hole of the first circular flow channel area 41, the diameter D2 of the flow channel hole of the second circular flow channel area 42 and the diameter D3 of the flow channel hole of the third circular flow channel area 43 are: D1>D2 and D3>D2, that is, the circular flow channel area is designed as a flow channel with a large-small-large aperture change from inside to outside, thereby increasing the fluidity corresponding to the inner and outer layers of the melt. Multiple layers of flow channels with different apertures may also be arranged in each circular flow channel area to enable more precise adjustments to be made according to the stability of the equipment structure and the characteristics of the raw materials.

[0023] In the above embodiments, by designing the inner circular flow channel area 4 and the outer strip flow channel 5 in the filter plate, and by designing the circular flow channel area to change the flow channel hole diameter from large to small to large from the inside to the outside, adopting different flow channel structures of circular and strip shapes, and distributing different flow channel hole diameters according to the flow area, the flow velocity of the flow channel with a larger aperture is faster and smoother, which can offset the friction between the inner layer of the melt and the screw and the outer layer of the melt and the barrel; at the same time, the temperature of the liquid insulating material corresponding to the larger hole is higher, and the temperature corresponding to the smaller hole is lower, so that when the insulating material passes through, it is not easy to produce too large a temperature difference. Thereby, the phenomenon of excessively high local melt temperature during the extrusion process can be significantly improved, that is, the temperature distribution of the insulating material passing through the filter plate is improved, and the problem of crowding and blocking on the filter plate is improved, so as to facilitate the production of long-length insulation. Therefore, the filter plate of the utility model can improve the long-term extrusion capacity of cross-linked polyethylene insulation, and the equipment structure is simple, and it can be widely used in the long-term extrusion production of cross-linked polyethylene insulated cables.

[0024] like Figures 3 to 5 As shown, a trumpet-shaped feed port 21 is provided at one end of the flow channel close to the feed surface 2, and a trumpet-shaped discharge port 31 is provided at one end of the flow channel close to the discharge surface 3. The angle α of the feed port 21 of the same inner flow channel is smaller than the angle β of the discharge port 31, and the discharge port of the outer strip flow channel 5 close to the discharge surface 3 is an arc-shaped transition surface. As a result, the filter plate has a use direction, the feed port angle of the flow channel is gentle when entering the filter plate, and the discharge port angle of the flow channel is large when leaving the filter plate, which is conducive to improving the pressure of the melt when being extruded.

[0025] Specifically, the angle α of the feed port 21 is 25-45°, the angle β of the discharge port 31 is 80-95°, the angle α of the feed port 21 is generally 30° or 40°, and the angle β of the discharge port 31 is generally 90°. The ratio of the length E of the feed port 21 to the length F of the discharge port 31 of the same flow channel is 2.5-4.0, and the ratio is generally 3; the ratio of the length of the outer strip flow channel 5 to the width of the outer strip flow channel 5 is 3-3.5, and the ratio is generally 3. Through the above numerical design, friction and pressure can be further accurately offset.

[0026] The utility model also provides an extruder for cable insulation extrusion, comprising the extruder head filter plate for cable insulation extrusion as above.

[0027] The preferred specific embodiments of the utility model are described in detail above. It should be understood that ordinary technicians in this field can make many modifications and changes based on the concept of the utility model without creative work. Therefore, all technical solutions that can be obtained by technicians in this technical field based on the concept of the utility model through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the scope of protection determined by the claims.

Claims

1. An extruder head filter plate for cable insulation extrusion, characterized in that: The invention comprises a cylindrical plate body (1), wherein two sides of the cylindrical plate body (1) are respectively formed with an inwardly concave feed surface (2) and a discharge surface (3), and a plurality of flow channels are opened on the cylindrical plate body (1) between the feed surface (2) and the discharge surface (3), and the plurality of flow channels include an inner circular flow channel area (4) and an outer strip flow channel (5); the inner circular flow channel area (4) includes, from the inside to the outside, a first circular flow channel area (41), a second circular flow channel area (42) and a third circular flow channel area (43), and the sizes of the diameter D1 of the flow channel hole of the first circular flow channel area (41), the diameter D2 of the flow channel hole of the second circular flow channel area (42) and the diameter D3 of the flow channel hole of the third circular flow channel area (43) are: D1>D2 and D3>D2.

2. The extruder head filter plate for cable insulation extrusion according to claim 1, characterized in that: A trumpet-shaped feed port (21) is provided at one end of the flow channel close to the feed surface (2), and a trumpet-shaped discharge port (31) is provided at one end of the flow channel close to the discharge surface (3), and an angle α of the feed port (21) of the same internal flow channel is smaller than an angle β of the discharge port (31).

3. The extruder head filter plate for cable insulation extrusion according to claim 2, characterized in that: The size of the angle α of the feed port (21) is 25 to 45°, and the size of the angle β of the discharge port (31) is 80 to 95°.

4. The extruder head filter plate for cable insulation extrusion according to claim 3, characterized in that: The discharge port at one end of the outer strip-shaped flow channel (5) close to the discharge surface (3) is an arc-shaped transition surface.

5. The extruder head filter plate for cable insulation extrusion according to claim 2, characterized in that: The ratio of the length E of the feed port (21) to the length F of the discharge port (31) of the same flow channel is 2.5 to 4.

0.

6. The extruder head filter plate for cable insulation extrusion according to claim 1, characterized in that: The ratio of the length of the outer strip-shaped flow channel (5) to the width of the outer strip-shaped flow channel (5) is 3 to 3.

5.

7. The extruder head filter plate for cable insulation extrusion according to claim 1, characterized in that: The cylindrical plate body (1) is provided with threads along the axial direction on the outside.

8. An extruder for cable insulation extrusion, characterized in that: It comprises an extruder head filter plate for cable insulation extrusion as described in any one of claims 1 to 7.

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