Cylinder assembly with filling opening

The invention relates to a cylinder assembly which comprises a cylinder that has a closure mechanism, and at least one inner cavity of the cylinder is filled with work raw material. The closure mechanism has a filling channel which intersects with a closure channel. Since the work raw material exists in both the filling channel and the closure channel, a closure member capable of moving between a filling position and a closure position is arranged in the closure channel. The closure channel is implemented to be a through hole and the filling channel is implemented to be a blind hole. One the one hand the blind hole is communicated with the closure channel and on the other end the blind hole is connected with the inner cavity. The closure member seals the closure channel on two sides of the intersection point of the filling channel and the closure channel.