One-time extrusion production cooling forming mold for foaming insulating core wire of leakage coaxial cable

Abstract

The invention relates to a one-time extrusion production cooling forming mold for a foaming insulating core wire of a leakage coaxial cable, which is applied to one-time extrusion cooling forming of the insulating core wire of the coaxial cable, and is particularly applied to one-time extrusion forming of the foaming core wire of the 75-ohm leakage coaxial cable. The one-time extrusion production cooling forming mold comprises a foaming extrusion mold core, a foaming extrusion mold sleeve and a forced cooling water pipe; the foaming extrusion mold core is arranged in the foaming extrusion mold sleeve, and the forced cooling water pipe is arranged on the front end part of the foaming extrusion mold sleeve; the foaming extrusion mold core comprises a mold core body, a mold nozzle, a threaded end and an inner conductor thread hole; the foaming extrusion mold sleeve is internally provided with a cone-shaped hollow hole, the opening of the foaming extrusion mold sleeve is provided with a strip-shaped slot, the outer end of the opening of the foaming extrusion mold sleeve is provided with an external thread, and the foaming extrusion mold sleeve is connected with the forced cooling water pipe through the external thread; the forced cooling water pipe is formed by a water cooling inner sleeve and a water cooling outer sleeve, one end of the water cooling inner sleeve is provided with an internal thread to be connected with the foaming extrusion mold sleeve, and the water cooling outer sleeve is sleeved outside the water cooling inner sleeve.

Description

technical field [0001] The invention relates to a cooling molding die for one-time extrusion production of leaky coaxial cable foam insulation core wires, which is suitable for one-time extrusion cooling molding of coaxial cable insulation core wires, especially suitable for 75 ohm leaky coaxial cable foaming One-time extrusion molding of the core wire is a new production process specially proposed for the production of foamed insulating core wires of 75 ohm leaky coaxial cables with insulation diameters above 23 mm. It simplifies the complicated production method of secondary extrusion molding used in the past to produce such products. The invention adopts one-time extrusion molding to ensure stable product structure and improve efficiency, and fundamentally improve the product quality of the 75-ohm leaky coaxial cable. Background technique [0002] 75 ohm leaky coaxial cable is a kind of leaky cable used in the railway wireless train dispatching communication system, whic...

AI Technical Summary

Problems solved by technology

If general extrusion molding is used in the production process, it is difficult for the insulating layer to remain round and tightly bonded to the inner conductor after it comes out of the mold due to its own weight and high foaming degree.

Therefore, many manufacturers usually use two extrusions for insulation, but in actual production it is difficult to achieve the same dielectric constant in the insulating layer of the two extrusions, and the unevenness of the outer diameter is more obvious than that of one extrusion. These defects directly Affects the quality of the 75 ohm leaky coaxial cable

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