Automatic telescopic butt joint device for pipelines

The utility model belongs to the technical field of powder conveying pipelines, and discloses a pipeline automatic telescopic butt joint device which comprises a lower connecting pipe installed on a feeding port of powder processing equipment, a movable pipe is arranged in the lower connecting pipe in a sliding mode, and the upper end of the movable pipe is connected with a lower butt joint seat. The powder processing equipment is further provided with a lifting assembly used for driving the movable pipe to ascend and descend, the powder processing equipment further comprises a material injection hopper installed above the powder processing equipment, the lower end of the material injection hopper is connected with an upper connecting pipe corresponding to the movable pipe, and the lower end of the upper connecting pipe is connected with an upper butt joint base. The movable pipe is driven by the lifting assembly to move up and down, when material injection is needed, the movable pipe moves upwards to be in b