| 摘要 |
FIELD: construction. ^ SUBSTANCE: invention comprises a percussion mass, a guide unit of the percussion mass, a unit of percussion mass lifting, comprising a body, in the cavity of which there is a distributing device, an intermediate guide bushing (hereinafter - a bushing) and a working chamber. At the same time the bushing is placed between the body of the lifting unit and the guide unit and has a circular ledge on the inner surface and a limiter of the reverse motion of the percussion mass, and also holes for supply of compressed air into the working chamber. At the same time the latter is formed by an elastic circular valve installed in the circular groove on the external surface of the front part of the percussion mass, the inner surface of the bushing and the end of the stepped rod, which is a stepped tail of the tool. The distributing device is made in the form of an elastic circular cut-off valve installed in the circular groove on the outer surface of the bushing, and the body of the lifting unit has a channel for inlet of compressed air into the lifting unit body cavity and into the working chamber. Both valves are installed with the possibility of interaction with inner surfaces of the bushing and the lifting unit body. ^ EFFECT: increased efficiency of pneumatic percussion machine operation due to reduced losses of an impact pulse in a stepped rod and availability of the possibility to only produce a single impact by a command with saving of compressed air, and also increased reliability of its operation due to simplified design. ^ 1 dwg |
