Excavator frame with balance weight box

The utility model discloses an excavator frame with a balance weight box. The excavator frame comprises a fuel gas tank and a frame body, wherein a fuel gas engine and the balance weight box are arranged on the middle portion and the rear portion of the frame body respectively. A vaporizer assembly which is fixedly arranged on the frame body through a bolt is arranged on one side of the front portion of the frame body. The excavator frame with the balance weight box is characterized in that the balance weight box is provided with a fuel gas tank mounting seat which is fixed through a bolt, the fuel gas tank is fixed on the fuel gas tank mounting seat through a fixing ring, the fuel gas tank is communicated with the vaporizer assembly through a copper tube, and the vaporizer assembly is communicated with the fuel gas engine through a rubber tube. The excavator frame with the balance weight box is reasonable in structure and novel in design, due to the fact that the fuel gas tank is mounted on the top of a bala