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The technical field of belt tensioning force studied in this paper, in particular, relates to a hydraulic belt tensioning device, including a base, a hydraulic system and a rail fixed on the base, and a tail wheel trolley sliding on the rail; This device can provide a large tension to the tail wheel of the conveyor belt to meet the tension required by the long conveyor belt. At the same time, it can automatically adjust the tension to the tail wheel of the conveyor belt according to the tension of the conveyor belt to realize the dynamic tension control of the conveyor belt; The device prevents belt deviation and material leakage, reduces labor intensity of workers, avoids equipment accidents, and improves industrial production capacity.

The research in this paper relates to the technical field of light load transportation, in particular to an electric upstairs car, which includes a frame, the top of the frame is fixedly equipped with a handle, the bottom of the frame is rotationally equipped with a group of wheels, the side wall near the bottom of the frame is fixedly equipped with a carrier plate, the support plate is fixedly arranged between the frames, and the box is fixedly arranged on the side of the support frame away from the carrier plate, A support rod is rotated on the opposite side of the box. The length of the support rod is larger than the diameter of the wheel. An arc surface is set on the support rod. A drive component is set in the box. The drive component is used to drive the support rod to rotate. This kind of electric car that can be transported longitudinally can reduce labor.