Bridge type coal sampling machine

The utility model discloses a bridge type coal sampling machine which comprises a cart walking mechanism, a sampling trolley, a feeding machine, a sample preparing system and an operation control system, wherein sampling heads, an oil cylinder, a lifting device and a hanging bracket are arranged on the sampling trolley; an angle steel guide rail and a trough type guide wheel are arranged on the lifting device, and are matched so that the sample heads can be kept on a straight line when being lifted. A coal storage chute is formed in the sampling trolley. The bridge type coal sampling machine is simple in structure, convenient to use, long in service life and high in reliability. The sampling trolley has an overhaul and maintenance space so as to provide the guarantee on daily overhaul and maintenance for a user; a gap between each sampling head and the guide rail can be conveniently regulated, the sampling heads are enabled to be kept on the straight line when being lifted, the stability of the sampling heads