Device for tamping backfill triangular area at bottom of pipeline

The invention provides a device for tamping a pipeline bottom backfill triangular area, the device comprises a moving frame and a tamping assembly arranged in the moving frame, the moving frame is provided with a telescopic left frame and a telescopic right frame, and the bottom of the moving frame is provided with a frame body moving assembly capable of driving the moving frame to walk automatically; an adjusting assembly is arranged between the left frame and the right frame and comprises a connecting plate and an adjusting plate which are sequentially arranged, the connecting plate is fixedly connected to the two sides of the left frame, the adjusting screw is in threaded connection with the adjusting plate, and the distance between the left frame and the right frame can be changed by rotating the adjusting screw. Therefore, the movable frame can be adjusted according to the backfilling width; and the tamping assembly comprises two sets of tamping rollers, a plurality of sets of tamping cones are symmetric