| 摘要 |
FIELD: impact devices, particularly adapted to loosen frozen ground and to dislodge rock, artificial materials, to compact ground in mining and metallurgical industry, utility, building and to design die-forging hammers and pile drivers. ^ SUBSTANCE: device comprises body and striking piston arranged in it and defining idle chamber permanently communicated with pressurizing line and hydropneumatic accumulator. The idle chamber is provided with coaxial end groove having side surface mating striking piston at the end of working stroke. Device also has working stroke chamber alternately communicated with drain line or idle chamber through the main hydrodistributor. The working stroke chamber also has coaxial end groove mating the striking piston at the end of idle stroke. The main distributor is provided with control hydraulic cavities having different areas. Cavity having the smallest area is permanently connected with pressurizing line, cavity having the greatest area is selectively connected with drain line through the first additional distributor at the end of working stroke and with pressurizing line through the second additional distributor at the end of idle stroke. ^ EFFECT: increased reliability and reduced time of structural units resetting. ^ 2 cl, 1 dwg
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