Knocking device for removing carbon deposition from coal gasifier

The invention discloses a knocking device for removing carbon deposition from a coal gasifier. The knocking device comprises a support body, a guide sleeve, a pressing sleeve, a piston rod, a piston, a hammer body and a filter arranged in the support body, and is characterized in that: a piston rod seal is a cartridge seal structure arranged in the pressing sleeve, and the pressing sleeve and the guide sleeve are sealed by an end face seal gasket; an O-shaped seal ring and a piston rod V-shaped seal structure are arranged in the cartridge seal structure; the piston rod V-shaped seal structure comprises a piston rod V-shaped ring, a piston rod support ring, a push ring pressed against the tail end of the piston rod support ring, and a piston rod spring supported on the push ring; the piston rod support ring and the piston rod V-shaped ring are limited by a collar at the periphery; and the piston rod spring pre-tightens the piston rod V-shaped ring through the push ring. By arranging the cartridge seal structur