Patent ID: 6320156
Filing Date: 2001-11-20
Classification: H05H

Abstract:
A plasma cutting device comprising: a plasma torch, a working table, and a movement mechanism for moving said plasma torch on said working table, wherein:said plasma torch comprises a torch main unit installed on said movement mechanism, and a detachable section installed detachably on said torch main unit;said detachable section comprises: an electrode; a nozzle disposed in such a manner that it surrounds said electrode; an insulating member interposed between said electrode and said nozzle; and a retainer cap inside which said electrode, nozzle and insulating member are accommodated;said torch main unit comprises: an electrode connecting section for coupling with said electrode; a nozzle connecting section for coupling with said nozzle; a retainer cap connecting section for coupling with said retainer cap; a cooling water pipe; and a plasma gas pipe;a coupling structure between said electrode and said electrode connecting section and a coupling structure between said nozzle and said nozzle connecting section being formed in such a manner that said electrode and said nozzle couple respectively with said electrode connecting section and said nozzle connecting section, when the operation of bringing said retainer cap close to said retainer cap connecting section along a predetermined path and coupling said retainer cap to said retainer cap connecting section is performed, and furthermore, said electrode and said nozzle detach respectively from said electrode connecting section and said nozzle connecting section, when the operation of detaching said retainer cap from said retainer cap connecting section and moving said retainer cap away from said retainer cap connecting section along a predetermined path is performed; andsaid electrode, said insulating member, said nozzle, and said retainer cap coupling mutually, the respective coupling force therebetween being stronger than both the coupling force between said electrode and said electrode connecting section and the coupling force between said nozzle and said nozzle connecting section;whereby all the parts in said detachable section can be installed on said torch main unit and detached from said torch main unit, by installing said retainer cap on said retainer cap connecting section and detaching said retainer cap from said retainer cap connecting section.