Plasma cutting torch

Abstract

The present invention provided a plasma torch which is stable in cutting performance, is long in service lives of an electrode and a plasma nozzle, and can be made small in size and lightening in weight are attained. The plasma torch is equipped with: an electrode provided at the axial part of a torch body, and in which a taper part is formed at the tip; a plasma nozzle fitted to the torch body; cups each surrounding the plasma nozzle and fitted to the torch body; movable rings sliding to the axial direction while the inner circumferential part is electrically contacted with the upper part of the taper part in the electrode, and the outer circumferential part is electrically contacted with the plasma nozzle; and springs each fitted to the inside face of the plasma nozzle and pushing-up the movable ring. Each sealed space is formed by the electrode, the movable ring, the plasma nozzle and the torch body, and at the time of arc starting, when plasma gas is fed to the space, the movable ring is separated from the upper part of the taper part in the electrode and moves to the lower direction, and the inner circumferential face of the movable ring is made non-contact with the taper part in the electrode, thereby generating a pilot arc.

Description

technical field [0001] The present invention relates to an improved plasma cutting torch for performing plasma cutting. Background technique [0002] In plasma cutting, a pilot arc is first generated between the electrode and the plasma nozzle. Then, the arc is ejected from the plasma nozzle by the pressure of the plasma gas, and a main plasma arc is generated between the electrode and the workpiece. The main plasma arc is extruded by the plasma nozzle and cooled by the plasma gas to generate a highly concentrated high-temperature plasma stream. The high-temperature plasma flow is used as a fusing heat source to melt the workpiece, and the molten material is eliminated by the plasma gas to perform cutting. [0003] Figure 5 It is a figure which shows the structure of a general plasma cutting apparatus. In this figure, a power supply device 1 for plasma cutting takes a commercial power supply as an input, and outputs electric power to a plasma cutting torch (torch) 2 and ...

AI Technical Summary

Problems solved by technology

Therefore, only the axial center of the electrode 7 changes a little, and it is difficult to keep the axial center of each of the electrode 7 and the plasma nozzle 9 on the same axis.

Therefore, when the main plasma arc moves, since the plasma arc is not generated in the axis direction, there is a disadvantage that the cutting performance deteriorates.

[0015] In addition, since the axes of the electrodes 7 and the plasma nozzles 9 are not on the same axis, the electrodes 7 and the plasma ejection holes 9a are unevenly worn, and the service life thereof is shortened.

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