A pressure equalizing sleeve assembly for extruder

Abstract

The utility model discloses a pressure equalizing sleeve assembly for an extruder, which mainly comprises a pressure equalizing sleeve and a flow limiting plate, wherein the flow cross-sectional area of ​​the flow limiting plate is smaller than the minimum cross-sectional area at the outlet of the pressure equalizing sleeve. The flow limiting plate is detachably fixedly connected to the inlet of the pressure equalizing sleeve. The corresponding selection is made according to the fluidity of the extruded material, so that one device can adapt to the extrusion and coating of materials with various fluidities, which greatly saves the production input cost of the enterprise.

Description

Technical Field

[0001] The utility model relates to the technical field of cable extrusion equipment, in particular to a replaceable and adjustable pressure equalizing sleeve component for an extruder. Background Art

[0002] The extruder is one of the commonly used equipment in cable processing, in which the screw extruder relies on the pressure and shear force generated by the rotation of the screw to fully plasticize and evenly mix the material, and is coated on the outside of the cable conductor and other wires through the die molding. In the prior art, during the extrusion process, the raw material particles loaded in the hopper enter the barrel with the help of gravity or the feeding screw, and are continuously pushed forward under the thrust of the rotating screw, starting from the preheating section and gradually moving to the homogenization section. At the same time, the plastic is stirred and squeezed by the screw, and is transformed into a viscous flow state under the action of the external heat of the barrel and the shear friction heat between the plastic and the equipment, forming a continuous and uniform material flow in the screw groove. In the field of cable processing, an extruder is usually used for the coating of a class of cables, and the fluidity of the corresponding raw material particles after heating is basically the same. Therefore, the pressure equalizing sleeve (ring) used is usually fixed. For example, Chinese patent document CN101628469B discloses an extruder for extruding a conductive polymer sheath through the ground wire, and the structure mainly includes a fuselage 1, a head 2 and a diverter plate 3. One end of the diverter plate 3 is connected to the body 1 through a flange 5, and the other end is connected to the head 2 through a flange. The diverter plate is provided with a plurality of through holes. A screw 4 is provided in the body 1. The head 2 includes a housing 21, a diverter sleeve 22 and a mold located in the housing, and the mold is composed of a mold sleeve 24 and a mold core 25. A pressure equalizing ring 23 is also provided in the housing 21 of the head, and the pressure equalizing ring 23 is clamped between the end of the diverter sleeve 22 and the end face of the mold sleeve 24. The inner surface of the pressure equalizing ring 23 gradually decreases in inner diameter from both ends to the middle. The pressure equalizing ring 23 is provided to ensure that the extrusion pressure is balanced, smooth, and has no dead angle. The pressure equalizing ring 23 is usually replaced. Now, with the development of the material of the extruded material and the changes in customer needs, the fluidity of the extruded material is also constantly changing. When the fluidity of the material is getting faster and faster, the original pressure equalizing ring will not play a pressure equalizing role. Utility Model Content

[0003] The utility model aims to provide a pressure equalizing sleeve component for an extruder which has a simple structure, strong adaptability and can be replaced and adjusted.

[0004] The basic technical scheme for achieving the purpose of the utility model is: a pressure equalizing sleeve assembly for an extruder, which has the following structural features: it includes a pressure equalizing sleeve and a flow limiting plate, the flow cross-sectional area of ​​the flow limiting plate is smaller than the minimum cross-sectional area at the outlet of the pressure equalizing sleeve. The flow limiting plate is detachably fixedly connected to the inlet of the pressure equalizing sleeve.

[0005] Furthermore, in order to achieve a good pressure equalization effect: the pressure equalization sleeve is provided with a central through hole. The central through hole is provided with a truncated cone section. The truncated cone section is arranged so that the cross-sectional area of ​​the upper bottom surface at the outlet is smaller than the cross-sectional area of ​​the lower bottom surface at the inlet.

[0006] Furthermore, in order to ensure uniform discharge, the included angle α between the generatrix of the truncated cone segment and the lower bottom surface is 75 to 85 degrees.

[0007] Furthermore, in order to adapt to the fluidity of different materials: there are several flow limiting plates, each of which has a different flow cross-sectional area, and the flow cross-sectional area of ​​each flow limiting plate is smaller than the cross-sectional area at the outlet of the pressure equalizing sleeve.

[0008] Furthermore, in order to adapt to the fluidity of different materials and play a good role in equalizing pressure: a plurality of through holes are provided on the flow limiting plate, each through hole is arranged on a different radius layer of the flow limiting plate, and a through hole located in the center is arranged coaxially with the flow limiting plate. Different radius layers of the flow limiting plate are arranged at equal intervals from the inside to the outside in the radial direction. The through holes on the same radius layer are arranged in a circular array.

[0009] The utility model has the following beneficial effects: (1) The pressure equalizing sleeve assembly for the extruder of the utility model is provided with flow limiting plates of different cross-sectional areas, which are selected accordingly according to the fluidity of the extruded material, so that one device can adapt to the extrusion and coating of materials with various fluidities, greatly saving the production input cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the pressure equalizing sleeve assembly of the utility model.

[0011] Figure 2 It is a schematic diagram of the structure of the pressure equalizing sleeve.

[0012] Figure 3 for Figure 2 Schematic diagram of the right side.

[0013] Figure 4 for Figure 1 Schematic diagram of the structure of the Zhongda current limiting plate.

[0014] Figure 5 for Figure 4 Schematic diagram of the left side.

[0015] Figure 6 Schematic diagram of the structure of the small current limiting plate.

[0016] The reference numerals in the accompanying drawings are:

[0017] Pressure equalizing sleeve 1, central through hole 11, cylindrical section 11-1, truncated cone section 11-2,

[0018] Current limiting plate 2, large current limiting plate 2a, small current limiting plate 2b, through hole 2-1. DETAILED DESCRIPTION

[0019] In order to make the contents of the utility model easier to understand clearly, the utility model is further described in detail below based on specific embodiments and in combination with the accompanying drawings. Similar numbers and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the utility model, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. It should be understood that the terms "upper", "lower", "inner", "outer", etc. indicate directions or positional relationships based on the positional relationships described in the drawings, and are only for the convenience of describing the utility model or simplifying the description, rather than indicating a specific direction that must be possessed. Describe the inlet and outlet in terms of the flow direction of the material (see Figure 2 ).

[0020] (Example 1)

[0021] See Figures 1 to 6 The pressure equalizing sleeve assembly for the extruder of the utility model includes a pressure equalizing sleeve 1 and a flow limiting plate 2, and the flow cross-sectional area of ​​the flow limiting plate 2 is smaller than the minimum cross-sectional area at the outlet of the pressure equalizing sleeve 1. The flow limiting plate 2 is detachably fixedly connected to the inlet of the pressure equalizing sleeve 1. The pressure equalizing sleeve 1 is provided with a central through hole 11. The central through hole 11 is provided with a cylindrical section 11-1 and a truncated cone section 11-2 in sequence along the material flow direction. The diameter of the lower bottom surface at the inlet of the truncated cone section 11-2 is equal to the diameter of the cylindrical section 11-1. The cross-sectional area of ​​the upper bottom surface of the truncated cone section 11-2 at the outlet is smaller than the cross-sectional area of ​​the lower bottom surface at the inlet. The angle α between the busbar of the truncated cone section 11-2 and the lower bottom surface is 75 to 85 degrees, and 80 degrees in this embodiment.

[0022] See Figure 5 and Figure 6 There are several flow limiting plates 2. In this embodiment, there are two flow limiting plates 2. The two flow limiting plates 2 are respectively called large flow limiting plates 2a and small flow limiting plates 2b according to the size of their flow cross-sectional areas. The flow cross-sectional area of ​​the large flow limiting plate 2a is larger than the flow cross-sectional area of ​​the small flow limiting plate 2b, and the flow cross-sectional area of ​​the large flow limiting plate 2a is smaller than the cross-sectional area of ​​the upper bottom surface at the outlet of the truncated cone section 11-2 of the central through hole 11.

[0023] The flow limiting plate 2 is provided with a plurality of through holes 2-1, each of which is arranged on a different radius layer of the flow limiting plate 2, and a through hole 2-1 located in the center is arranged coaxially with the flow limiting plate 2. The different radius layers of the flow limiting plate 2 are arranged at equal intervals from the inside to the outside along its radial direction. The through holes 2-1 on the same radius layer are arranged in a circular array. The material with poor fluidity adopts a large-aperture through hole 2-1, and the number of its radius layers is small, and the material with good fluidity adopts a small-aperture through hole 2-1, and the number of its radius layers is large.

[0024] In this embodiment, the through hole 2-1 of the large current limiting plate 2a has a diameter of 7.5 mm, the radius of the second layer is 9 mm, and the radius of each subsequent layer increases by 9 mm, with a total of 7 layers, and the radius of the outermost layer is 54 mm. The sum of the cross-sectional areas of the through holes 2-1 is 5607 square millimeters.

[0025] In this embodiment, the through hole 2-1 of the small current limiting plate 2b has a diameter of 4 mm, the radius of the second layer is 5 mm, and the radius of each subsequent layer increases by 5 mm, with a total of 12 layers, and the outermost layer radius is 55 mm. The sum of the cross-sectional areas of the through holes 2-1 is 4986 square millimeters.

[0026] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pressure equalizing sleeve assembly for an extruder, characterized in that: It comprises a pressure equalizing sleeve (1) and a flow limiting plate (2), wherein the flow cross-sectional area of ​​the flow limiting plate (2) is smaller than the minimum cross-sectional area at the outlet of the pressure equalizing sleeve (1); and the flow limiting plate (2) is detachably fixedly connected to the inlet of the pressure equalizing sleeve (1).

2. The pressure equalizing sleeve assembly for the extruder according to claim 1, characterized in that: The pressure equalizing sleeve (1) is provided with a central through hole (11); the central through hole (11) is provided with a truncated cone section (11-2); the truncated cone section (11-2) is arranged so that the cross-sectional area of ​​the upper bottom surface at the outlet is smaller than the cross-sectional area of ​​the lower bottom surface at the inlet.

3. The pressure equalizing sleeve assembly for the extruder according to claim 2, characterized in that: The included angle α between the generatrix of the truncated cone segment (11-2) and the lower bottom surface is 75 to 85 degrees.

4. The pressure equalizing sleeve assembly for an extruder according to any one of claims 1 to 3, characterized in that: There are a plurality of flow limiting plates (2), and the flow cross-sectional areas of the flow limiting plates (2) are different in size. The flow cross-sectional area of ​​each flow limiting plate (2) is smaller than the cross-sectional area at the outlet of the pressure equalizing sleeve (1).

5. The pressure equalizing sleeve assembly for the extruder according to claim 4, characterized in that: The flow limiting plate (2) is provided with a plurality of through holes (2-1), each through hole (2-1) is arranged on a different radial layer of the flow limiting plate (2), and a central through hole (2-1) is arranged coaxially with the flow limiting plate (2); the different radial layers of the flow limiting plate (2) are arranged in order at equal intervals from the inside to the outside along the radial direction; and the through holes (2-1) on the same radial layer are arranged in a circular array.

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