| 摘要 |
Hydraulic impact tools are described which develop percussive forces for rock drilling and other repetitive high force applications. A self-excited oscillator is disclosed which includes a hammer and a valve coaxial with and actuated by the hammer for controlling the flow of pressurized hydraulic fluid. The hammer is accelerated away from an impact position to store energy in an energy storage system. The stored energy in the system is eventually returned to the hammer to drive it at increasing velocity back to its impact position. Accumulators forming part of the oscillator are closely coupled to the hammer by way of hydraulic galleries or channels and operate in concert with the hammer to provide energy storage characteristics for oscillator operation and to reduce fluctuations in the flow of hydraulic fluid and to provide for efficient operation of the oscillator.
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