Thermit welding die assembly for grinding nets

Abstract

The invention discloses a thermit welding die assembly for grinding nets. The thermit welding die assembly comprises a die sleeve, a cylindrical upper die core and a cylindrical lower die core. The die sleeve comprises two half dies, the two half dies are of symmetric structures, a cylindrical die cavity can be formed after the two half dies are closed, the upper die core and the lower die core can be fixed by the aid of the cylindrical die cavity, an inner cavity of the upper die core is a conical reaction cavity with an upward large opening and a downward small opening, the lower die core comprises a flow guide groove and a plurality of fusion welding cavities, the multiple fusion welding cavities are communicated with one another in a clamp manner via the flow guide groove which is usedas a symmetric shaft, and inner cavities of the upper die core and the lower die core are opposite to each other to form a welding cavity when the two half dies are in die closed states. The thermitwelding die assembly has the advantages that the problem of requirements on special thermit welding dies for connectors in different forms can be solved by the aid of the thermit welding die assembly;connectors which have different specifications and different sizes and are in optional forms can be particularly welded by the single die sleeve and the different die cores during field construction,and accordingly the transport convenience can be improved; only the die cores are made of three-immersing and four-baking graphite materials, and accordingly the thermit welding cost can be lowered to a great extent.

Description

technical field [0001] The invention relates to aluminothermic welding, in particular to a mold assembly for aluminothermic welding of grounding grids. Background technique [0002] At higher temperatures, aluminum has a strong chemical affinity for oxygen, which can capture oxygen from oxides of metals such as Fe, Cr, Mn, Ni, Cu, etc. to reduce metals, and release a lot of heat at the same time. This welding method, which uses the heat generated by the redox reaction of metal oxides and aluminum to melt the metal to fill the joint, is called aluminothermic welding. [0003] Compared with the gas welding or arc welding process, the aluminothermic welding process requires less safety and operator skills. In addition, the aluminothermic welding only needs flux, ignition device and mold to carry out welding without a large number of auxiliary welding equipment. For field Environmental welding is fast and convenient; the chemical reaction of aluminothermic welding is very fast,...

AI Technical Summary

Problems solved by technology

During field construction, it is necessary to bring a variety of special molds according to different specifications and different sizes of joints, but the graphite mold is not strong enough, the transportation convenience is poor, and the three-dip and four-baked graphite graphite mold that needs to withstand high temperature shocks is expensive and has a short life (dozens of times without etc. will be eliminated), which limits the promotion and application of aluminum welding in the grounding grid

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