Pipeline internal tensioning device with adjustable diameter

The utility model relates to the technical field of pipeline detection, in particular to a diameter-adjustable pipeline interior tensioning device. A screw rod base is arranged in the left machine body; a screw rod is arranged on the screw rod base; the screw rod is connected with a screw rod motor; the lead screw is connected with a lead screw nut A and a lead screw nut B; the lead screw nut B is connected with a driven wheel connecting rod and a driving wheel connecting rod; driven wheels are arranged at the tops of the driven wheel connecting rods; the other ends of the driven wheels are connected with fixing shafts; the other ends of the driving wheel connecting rods are connected with driving wheels; the driving wheels are connected with driving motors; and the driving motor is arranged in the right machine body, so that the problem of inconvenience in tensioning and crawling of detection equipment in pipelines with different sizes is solved. 本实用新型涉及管道检测技术领域，具体涉及一种可调直径的管道内部张紧装置，机体为分体结构设置；左侧机体内设置有丝杆底座；丝杆底