HYDRAULIC PERCUSSIVE DEVICE (VARIANTS) Russian patent published in 2004 - IPC

FIELD: hydraulic percussive devices engineering. SUBSTANCE: according to first variant, device has body, striker, straight drive chamber and reciprocal drive chamber formed between the body and the striker, controlling channel in the body, connected to reciprocal drive chamber at the end of striker reciprocal drive, hydraulic dispensing device for connecting straight drive chamber to liquid loss source, accumulator and reciprocal drive chamber at the end of striker reciprocal drive, and after its delay before reciprocal drive start and reaching given pressure value P₃ of the system concurrently with discharge into the tank. Between striker and body an additional chamber is formed, which is in constant connection to tank inlet. This chamber on straight drive of striker is connected to controlling channel in the body when the pressure value of operation fluid in the system is less than value of P₃. Hydraulic dispensing device is a hydraulic control valve, first control chamber of which is in constant connection to liquid loss source, accumulator and reciprocal drive chamber, and second control chamber of which is in constant connection to controlling channel in the body and which is spring-loaded with force equal to force in first controlling chamber when operation liquid pressure is equal to value P₃. According to second variant of construction, hydraulic dispensing device in the device is a hydraulic control valve and an additional chamber is formed between the striker and the body, which is in constant connection to first controlling chamber of hydraulic control valve through controlling chamber in the body. Second controlling chamber of hydraulic control valve is spring-loaded with a spring with force equal to force in first controlling chamber when pressure of operation liquid in the system is equal to value of P₃. Additional chamber at the end of reciprocal drive of striker is connected to tank discharge inlet, and at the end of straight drive of striker when the system pressure is less than P₃ value, it is connected to liquid loss source, accumulator and reciprocal drive chamber. EFFECT: increased operation effectiveness, increased percussion energy, increased power and performance factor due to change of operation mode of hydraulic dispensing device. 2 cl, 2 dwg