Belt conveying device

The embodiment of the invention belongs to the field of conveying equipment, particularly relates to a belt conveying device, and aims to solve a problem that a scale frame integrally welded in the belt conveying device is easy to deform, and detection precision is insufficient. The belt conveying device comprises a scale frame, a first supporting beam, a second supporting beam and a conveying mechanism, wherein the scale frame comprises a first longitudinal beam and a second longitudinal beam, the extending direction of the first longitudinal beam and the extending direction of the second longitudinal beam are parallel to the extending direction of a belt, and a cross beam is detachably connected with the first longitudinal beam and the second longitudinal beam; a supporting frame is detachably connected with the scale frame; the first supporting beam and the second supporting beam are both fixedly connected with a conveying frame and are arranged at intervals in the extending direction of the belt, the firs