The utility model relates to the technical field of packaging machines, and discloses a
packaging machine with an adjustable conveying belt, which comprises a
packaging machine main body and a conveying belt mechanism arranged on the
packaging machine main body, the conveying belt mechanism comprises a
servo motor and a conveying belt wheel, the surface of the packaging
machine main body is provided with a pre-tightening mechanism and a pull-open
assembly, the pre-tightening mechanism is composed of a pre-tightening chain, a pre-tightening plate, a belt penetrating frame and an adjusting piece, the pulling-open
assembly comprises a pull rod, a fixing frame and an elastic piece, according to the packing
machine with the adjustable conveying belt, through the arranged pulling-open
assembly and the pre-tightening mechanism, after the pre-tightening chain is controlled not to be tightened any more, the pull rod can swing downwards at the position hinged to the fixing frame under the action of the elastic piece, and therefore the conveying belt can be adjusted. The pull rod can pull the pre-tightening chain, so that the pre-tightening chain is not attached to the belt conveying wheel any more, a worker can conveniently penetrate a packing belt through a notch of the belt conveying wheel at the moment, use is convenient, and the overall working efficiency is effectively improved.