Extruder used for extruding conductive high polymer sheath run-through ground wire

Abstract

The invention provides an extruder which is used for extruding conductive high polymer sheath run-through ground wire, comprising an engine body, an engine head and a splitter plate, wherein, one end of the splitter plate is connected with the engine body through a flange and the other end is connected with the engine head through a flange; the splitter plate is provided with a plurality of through holes; the engine body is internally provided with a screw rod; the engine head comprises a casing and a splitter sheath and a mould which are arranged in the casing; the mould is composed of a mould sheath and a mould core. The invention is characterized in that the casing of the engine head is further provided with a grading ring which is clamped between the end part of the splitter sheath and the end surface of the mould sheath; the inner diameter of the medial surface of the grading ring tapers gradually from two ends to the middle part. The extrusion pressure of the extruder is even and stable; the fluctuation ranges of the load current and the temperature are small; the appearance quality of the extrusion sheath is smooth and rounding; and the damage to the electrical property and mechanical and physical property of the sheath in the extrusion process is reduced.

Description

technical field [0001] The invention relates to a production equipment for a conductive polymer sheath penetrating a ground wire, in particular to an extruder for extruding a conductive polymer sheath penetrating a ground wire. Background technique [0002] The sheath material of the conductive polymer sheath penetrating the ground wire is the same as the extrusion of ordinary plastics. It is divided into three stages: plasticization, extrusion molding, and shaping. The three stages are respectively in the body of the extruder and the head mold. And the supporting cooling water tank to complete, because the melting index of conductive polymer plastics is particularly small, and the hardness and viscosity are high, so it brings many difficulties to processing and extrusion, which are specifically reflected in the following aspects: [0003] 1. Extrusion load is heavy. The original motor power of the production line cannot meet the basic production requirements, and it is eas...

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Problems solved by technology

The original motor power of the production line cannot meet the basic production requirements, and it is easy to overload and burn out the motor

[0004] 2. Difficult to control the temperature

Due to the high hardness and high viscosity of the material, the melt pressure is high during extrusion, and the heat generated by the shearing of the material in the fuselage is large. If the heat generated by the shearing is greater than the heat dissipation of the equipment itself, the temperature can exceed the extrusion set temperature. Make the conductive material carbonized and decomposed, extruded and cracked, and its electrical and mechanical properties are extremely deteriorated

[0005] 3. There is serious material leakage at the connection between the machine head and the fuselage

Due to the increase of the extrusion pressure, the melt flows out from the gap at the flange connection, which destroys the uniformity of the pressure in the extrusion channel, so that the stability of the extrusion volume cannot be guaranteed, and the waste is also increased.

[0006] 4. Larger extrusion pressure is easy to damage the extruder head

[0007] 5. The quality of the products produced is unstable, and the electrical properties and mechanical and physical properties of the sheath cannot be guaranteed to meet the product quality requirements

[0008] In response to the above problems, the general extrusion improvement measures are to increase the power of the motor, increase the cooling water circulation and cooling fan power, appropriately reduce the compression ratio of the screw, and use general sealing rings at the flange joints, etc. However, these measures cannot fundamentally To solve the problems existing in the extrusion process, the quality stability of the extruded conductive plastic cannot be fully ensured

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