Technological equipment for processing valve pit on top of piston

The utility model discloses technological equipment for processing a valve pit on the top of a piston. A spigot positioning disc is fixed at a middle position on a base; through holes are correspondingly formed in the centre of the spigot positioning disc and on the base; the equipment is provided with a locking device which consists of a pull rod and a locking nut; the pull rod is formed in a way that a pull ring with a transverse through hole on the top is connected with a vertical threaded rod into a whole; the threaded rod of the pull rod penetrates through the spigot positioning disc and the through hole in the base and extends outside of the base; the end part of the threaded rod of the pull rod is screwed with the locking nut; a pin shaft with two ends simultaneously penetrating through a piston pin hole is arranged in the transverse through hole (on the top of the pull rod) of the pull rod in a penetrating way; and a pin shaft positioning block with an adjustable position is fixed on one side on the b