| 摘要 |
FIELD: mining and building, particularly air percussion machines for placing sheet pile bulkheads, piles, mould-pipes, or other moulds in ground by driving. ^ SUBSTANCE: machine comprises hammer, guiding unit for hammer movement, hammer lifting unit having body with cavity for distribution means receiving, and compressed air working chamber provided with unit for hammer lifting unit arrangement and with membrane having compressed air exhaust orifice. Hammer lifting unit body is provided with compressed air supply channel, which feeds compressed air from manifold and with compressed air supply orifice, which moves compressed air in working chamber from cavity arranged for distribution means installation. The hammer is installed to cooperate with membrane and with distribution means through above compressed air exhaust orifices made in membrane to supply compressed air in hammer lifting unit body. The distribution means is spring-loaded shutoff valve. Guiding unit for hammer movement has exhaust windows and is made as vertical pipe with lid, which are connected with hammer lifting unit body. The hammer lifting unit body has stepped cavity in which spring-loaded three-stage rod is arranged, at least two compressed air supply orifices, which feeds compressed air in working chamber from cavity adapted for distribution means receiving and lid made as a single member with pipe. Lower end of three-stage rod and upper end of rod to be driven are arranged in lid hollow. The three-stage rod may perform axial displacement relative hammer lifting unit body and cooperate with hammer by upper end and with rod to be driven by lower end thereof. The distribution means is installed so that it may cooperate with hammer through membrane, annular plate and rigid connection means passing through above orifices made in hammer lifting unit body. Central stage of three-stage rod has transversal dimension exceeding that of lesser step of stepped hammer lifting unit body cavity. ^ EFFECT: increased operational efficiency. ^ 3 cl, 1 dwg |
