Angle-adjustable scraper type dredging device and drainage pipeline dredging robot

According to the angle-adjustable scraper type desilting device and the drainage pipeline desilting robot, the relative fixing relation between the lead screw sleeve and the lead screw and the relative fixing relation between the lead screw sleeve and the fixing plate are switched through cooperation of the slotting and the clamping mechanism, and the lead screw and the lead screw sleeve limited by the slotting are driven by the driving motor to rotate; the screw rod sleeve is driven to move forwards or backwards to drive the supporting rod to move forwards or backwards, so that the movable arm with the arc-shaped scraping plates is expanded or shrunk, the opening angle between the arc-shaped scraping plates can be adjusted, and the device can be matched with drainage pipelines with different pipe diameters; after the angle is adjusted, the clamping mechanism is arranged and the slotting cutter is removed, so that the fixed connection relation between the lead screw sleeve and the lead screw is removed and sw