Adjustable belt self-tensioning device

The invention discloses an adjustable belt self-tensioning device, and belongs to the technical field of belt transmission. The device comprises a supporting base, a guide assembly, a tensioning component and an adjusting assembly, wherein the adjusting assembly and the guide assembly are arranged on the supporting base; and the tensioning component is in sliding connection with the guide assemblyand is connected with the adjusting assembly. A lower guide rod and an upper guide rod are adopted for guiding and limiting the tensioning component, the position precision of a tensioning wheel relative to a belt is improved while the structural rigidity and stability are guaranteed, stable running of the belt is facilitated, and the service life of the belt can be better prolonged. After the belt is loosened, the tensioning wheel moves downwards under the self-weight effect of the tensioning component and continues to press the belt to tension the belt, meanwhile, a spring stretches to automatically compensate for