Portable empty gas detection surveys device

The utility model discloses a portable empty gas detection surveys device, including the detection device body, the bottom of detection device body is equipped with the cavity, the cavity rotates andis connected with spiral shell rasp bar, two slide bars that the fixedly connected with symmetry set up in the cavity, it has cup jointed the slider to slide on the slide bar, the one end and the spiral shell rasp bar fixed connection of slide bar are kept away from to the slider, the one end that spiral shell rasp bar kept away from the slider runs through the interior bottom of cavity and outwards extends, the one end fixedly connected with base that spiral shell rasp bar extends, the threaded one end that spiral shell rasp bar is close to the base has cup jointed the control block, the oneend of control block is rotated through the pivot and is connected with the arc pole, the cover is equipped with torque spring in the pivot, torque spring's both ends respectively with arc pole and control block fixed connecti