Abstract: Disclosed is a tip separation apparatus of a welding gun, which mechanically separates consumable tips installed at the end of the welding gun in a robot welding machine. The tip separation apparatus includes tip seating stands coupled to a main plate configured to maintain level, and configured such that each of the tip seating stands has a first insertion hole, into which a corresponding one of tips coupled to fingers of the welding gun is inserted, tip separation units rotatably disposed on bottom surfaces of the tip seating stands and configured to press outer circumferential surfaces of the tips inserted into the first insertion holes of the tip seating stands so as to clamp the tips and to rotate the clamped tips so as to separate the tips from the welding gun, and a housing configured to rotatably receive the tip separation units in a state of being elastically supported.

Abstract: A low noise block down converter for receiving satellite broadcasting comprises an input terminal; a low noise amplifying unit including one or more low noise amplifiers configured to amplify a signal received from the input terminal, and a built-in cavity waveguide band pass filter configured to pass a frequency band being higher or lower than a frequency band of a predetermined terrestrial transmission signal among satellite broadcasting frequency bands of signals amplified by the one or more low noise amplifiers; and a mixer configured to convert the signal output from the low noise amplifying unit into an intermediate frequency signal by mixing the signal output from the low noise amplifying unit with a local oscillation signal.