TWO-PISTON AIR HAMMER Russian patent published in 2017 - IPC E21B4/14 E21B1/24 E21B1/38 E21C37/24 B25D9/14 

FIELD: machine engineering.

SUBSTANCE: device includes a housing with two coaxially located cylindrical cavities separated by a partition with an opening, two pistons located within the cylindrical cavities having cavities of driving and idle strokes, a shank coaxially arranged with the pistons, an air distribution unit with air supply and air discharge channels of equal diameter and a working slide valve in the form of a hollow cylinder, installed in a cylindrical cavity, with the formation of chambers. The housing is equipped with a compressed air supply chamber. One of the pistons is made hollow with a hollow rod, and the second piston is made solid with two solid rods. One of the rods installed in the cavity of the other piston and the opening of the partition between the cylinders. The second rod is mounted coaxially to the first rod on the opposite side of the piston and is provided with a pusher disposed at its end. The rod with the pusher is made of variable cross-section and is installed with a gap with the possibility of moving in the cavity of the working slide valve. The slide valve is provided with a supply and a discharge annular grooves, wherein the supply groove is connected to the compressed air supply chamber and to the cylindrical cavities of the pistons by channels, and the discharge groove is connected to the atmosphere by air discharge channels. The grooves are located at a distance from each other equal to three channel diameters, the width of the grooves is equal to the diameter of the channel, the distance between the channels in the area of the working slide valve is equal to one channel diameter, and the stroke of the working slide valve is equal to two channel diameters.

EFFECT: increased operational characteristics and performance reliability.

2 cl, 3 dwg