The invention relates to an adjustable
impact cylinder, comprising a cylinder
barrel, a sealing
piston, a
front cover, a rear cover and a middle cover, wherein the cylinder is divided into an air storage cavity, a rod-free cavity and a rod-mounted cavity by the middle cover and the sealing
piston, a throughway valve is arranged at one side of the middle cover, the core of the throughway valve canmove vertically on a vertical surface of the cylinder
barrel to change the flow area of a
nozzle, the core is level with the edge of the
nozzle when being located at an upper stop point, at this moment, the flow area of the
nozzle is maximal, air inlet channels are arranged sequentially on the upper end of the middle cover towards one side of the air storage cavity, and simultaneously, a
backup air inlet communicated with outside is further arranged on the middle cover. The adjustable
impact cylinder has the advantages that:
impact force is changed by controlling the flow area of the nozzle; air can be supplied in time, the speed of air supply is enhanced, the working frequency is guaranteed; and the adjustable impact cylinder has the characteristics of being small in volume, light in weight, large in output energy, reliable in operation, low in manufacturing cost, convenient for maintenance, long in service life, etc.