Device for throwing and withdrawing knob type connecting piece

The invention discloses a device for switching on and switching off a knob type connecting piece, which comprises a protection device, a switching device, a switching device, a switching device and a switching device, and is characterized in that the protection device comprises the knob type connecting piece connected with the protection device; the device main body is connected with the knob type connecting piece, and the device main body comprises a driving assembly, a sleeve throwing and retreating assembly of which one end is inserted into the driving assembly and the other end is inserted into the knob type connecting piece, and a handheld control assembly which is in limiting connection with the driving assembly and is rotationally connected with the sleeve throwing and retreating assembly; and the quantitative protection assembly is arranged in the sleeve throwing and withdrawing assembly. The labor-saving device has the beneficial effects that by designing the labor-saving device for throwing and with