Arc extinguish chamber and longitudinal magnetic contact device thereof

The invention relates to an arc extinguish chamber and a longitudinal magnetic contact device thereof. The longitudinal magnetic contact device comprises a longitudinal magnetic contact, wherein the longitudinal magnetic contact comprises a cuplike coil and a contact blade; the contact blade is welded and fixedly connected to the front end of the cuplike coil; a pre-fixing structure for achieving pre-fixing assembly of the contact blade and the cuplike coil before welding is arranged between the cuplike coil and the contact blade; the pre-fixing structure comprises L-shaped hooked grooves and L-shaped hangers, which are hooked and assembled together in pairs; more than two pairs of L-shaped hooked grooves and L-shaped hangers are evenly distributed at intervals along the circumferential direction of the contact blade in pairs; each L-shaped hooked groove comprises a vertical groove segment and a transverse groove segment; each vertical groove segment comprises an end part opening into which the corresponding L-shaped hanger enters; the L-shaped hooked grooves and the L-shaped hangers are provided with radial positioning surfaces and axial positioning surfaces respectively; each radial positioning surface is used for being in pressing fit with a corresponding stopper to carry out radial positioning on the contact blade; and each axial positioning surface is used for carrying out axial positioning on the contact blade in front and back axial direction. The contact blade is reliably fixed and assembled on the cuplike coil through the pre-fixing structure, so that the welding effect is ensured.