What are the three types of molds for mining control cables?

I. What are the three kinds of molds for mining control cables? Mining control cable is mainly composed of cast iron terminal box body, insulating porcelain casing, cap and hood type wire clamp, sealing lead and grounding lead wire, cable. Applicable to AC rated voltage u0/u for 450/750V and below control and monitoring circuits and protection lines and distribution devices in the electrical instrumentation connection line. Mining control cable production in the use of molds (including die core and die sets) there are three main forms: extrusion, extrusion tube type, half-extrusion type (or half-extrusion tube type). Extruded mold: mining control cable is to achieve product molding by pressure, so extrusion molding products dense. Die core and die with the die set with the angle difference determines the size of the * pressure, affecting the quality of the rubber layer and the amount of extrusion; die core and die set size determines the geometry of the extruded product and surface quality. Extrusion mold selection size requirements are very strict, high cost, low extrusion, so in addition to the requirements of dense insulation structure and extrusion tensile ratio other than small, most of the extruded tube instead of extrusion. Mining control cable extruded tube mold: in the rubber covered in the core before, due to the role of the mold to form a tube, mining cable and then after stretching covered in the surface of the core. Extruded tube molds than extrusion molds have the following advantages: 1, can make full use of the plastic stretchable properties, extrusion thickness is much greater than the required thickness, mining communication cable so the speed of the line can be improved according to the different stretch ratio. 2, the uniformity of the thickness of the covering is only related to the concentricity of the die sleeve, will not be due to the change in shape of the core or bending deformation of the core resulting in the covering of bias core. 3, the plastic by the orientation of the stretching, which improves the mechanical strength, crystallinity and the surface of the core. 4, the plastic is not a good material, but a good material. Mechanical strength, crystallinity and resistance to cracking are improved. 4. The clearance between the mold and the core is larger, which can reduce mold wear and scratch the core. 5. The mold is more versatile. 6.

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