Belt middle sampling device

The utility model discloses a belt middle sampling device which comprises a rubber belt machine, a plurality of supporting rods are arranged on the rubber belt machine, a dust cover is arranged between the supporting rods, square holes are formed in the two sides of the dust cover, a stepping motor is arranged at the top end of the dust cover, and a lead screw is arranged at the output end of the stepping motor. A U-shaped supporting plate is connected between the two lead screws on the same side in a threaded mode, a U-shaped lifting plate is arranged on the U-shaped supporting plate, material conveying assemblies are arranged on the two sides of the dustproof cover, a containing box is arranged at the top end in the dustproof cover, a fixing block is arranged at the top end in the containing box, and two first sliding grooves are symmetrically formed in the fixing block; and a sampling assembly is arranged on the fixing block, a pushing assembly is arranged at the bottom end of the fixing block, and materia