Fixed type medium-frequency inversion direct-current rail welding machine

Abstract

The invention discloses a fixed intermediate frequency inverter DC rail welding machine, which is used for welding rails. The rail includes a rail waist, a rail top and a rail bottom. The rail welding machine includes: a welding frame, which includes a static fixture, Its clamping end is clamped at the rail waist of the first rail; the clamping end of the movable clamp is clamped at the rail waist of the second rail, and is used to clamp the second rail and connect with the first rail; A pair of first conductive electrodes, which are arranged at the clamping end of the static fixture, and are respectively located on both sides of the rail waist; a pair of second conductive electrodes, which are arranged at the clamping end of the moving fixture, and are respectively located on both sides of the rail waist; Intermediate frequency inverter direct current, the positive and negative ends of which are respectively connected to the first conductive electrode and the second conductive electrode, the first and second conductive electrodes receive intermediate frequency inverter direct current, so that the welding interface end of the rail generates arc light and welds. The invention adopts an intermediate frequency inverter DC power supply, so that the current acting on the cross section of the rail is very uniform, and the melting degree per unit area of ​​the welded rail tends to be consistent.

Description

technical field [0001] The invention relates to the field of rail welding, in particular to a fixed intermediate frequency inverter DC rail welding machine. Background technique [0002] At present, the welding of domestic high-speed railway tracks mostly uses two types of three-phase secondary rectifier welding machine and AC welding machine. The welding defects of the two kinds of equipment are unstable quality and complicated control. As a result, in the process quality strength assessment (drop weight test) organized by the Ministry of Railways every year, rail breakage often occurs, and there are no rules to follow. [0003] Many rail welding bases in China are currently in a state of helplessness. The welding quality of field rails is more unstable. Especially in plateau areas and cold areas, the welding strength and fastness of the rails are not satisfactory, the welding speed is slow, and the welding quality is unstable. Trace it to its cause, mainly be that the ...

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Problems solved by technology

[0004] The electrode conduction mode of foreign welding machines is the rail top, the rail bottom is directly pressed or the rail top is tightened to conduct electricity. This method cannot realize the partial distribution of the current density on the cross-sectional area of ​​the workpiece.

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