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US 2024/0133158 A1Published application
Percussion device and method for controlling the same
AssigneeSandvik Mining and Construction Oy
InventorsMika OKSMAN, Jyrki NISSINEN, Juhani LAINE, Ossi GROHN
Life of this patent
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Abstract
A hydraulic percussion device and method of controlling a working cycle of a percussion piston is provided. A rock breaking machine includes a percussion device provided with a reciprocating piston executing a working cycle. The operation is controlled by means of a control unit generating control signals for independently operable feed and discharge valves of a hydraulic system. The position of the piston is detected by a sensing device.
Claims16
A percussion device comprising:
- a frame and a piston arranged inside the frame and configured to perform a working cycle including reciprocating longitudinal movement of the piston in an impact direction and a return direction due to pressure of hydraulic fluid fed to first and second working pressure spaces of the percussion device;
- at least one sensing device arranged for detecting a position of the piston relative to the frame;
- at least one feed valve arranged for controlling feeding and at least one discharge valve arranged for controlling discharging of the hydraulic fluid of at least one of the first and second pressure spaces;
- and
- at least one control unit configured to control the feed valve and the discharge valve for executing the working cycle in response to sensing data received from the at least one sensing device and control parameters input to the control unit, wherein the feed and discharge valves are both controllable to a closed control state and to an open control state, the control unit being provided with at least one control cycle, wherein the mentioned feed and discharge valves are independently controllable, wherein the control cycle includes at least one overlap control feature, wherein the feed and discharge valves are simultaneously in the same control state, and wherein the overlap control feature is steplessly and independently controllable by control signals of the control unit.
2 more elements
A method of controlling operation of a hydraulic percussion device, the method comprising:
- detecting position of the piston by means of at least one sensing device and providing at least one control unit with sensing data gathered by the sensing device;
- controlling at least one feed valve and at least one discharge valve under control of the control unit and controlling feeding and discharging of hydraulic fluid of at least one of a first and second pressure spaces of a percussion device for executing a working cycle of a piston in response to the received sensing data and control parameters input to the control unit, wherein the feed and discharge valves are both controlled to a closed control state and to an open control state during the work cycle;
- controlling the feed valve and the discharge valve independently relative to each other under control of the control unit during the work cycle;
- implementing in a control cycle of the mentioned valves at least one overlap control feature, wherein the feed and discharge valves are simultaneously in the same control state;
- and
- generating control signals in the control unit for controlling the feed and discharge valves steplessly and independently relative to each other in accordance with the overlap control feature.
3 more elements
Dependencies are inferred from the claim text.