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US 6,877,569 B2Granted
Method for controlling operating cycle of impact device, and impact device
AssigneeSandvik Tamrock Oy
InventorAntti Koskimäki
Life of this patent
Estimating the term…
Abstract
A method for controlling the operating cycle of an impact device, and an impact device. Percussion piston position is measured using a sensor (11) from which the measurement data is transmitted to a control unit (12) of the impact device, which in turn controls an electrically driven control valve (10).
Claims10
A method for controlling the operating cycle of an impact device,
- the impact device being designed for breaking rock and comprising a frame, a percussion piston, working pressure surfaces formed on the percussion piston and acting both in the impact direction and in the return direction, working pressure ducts and discharge ducts for guiding pressure medium to act on the working pressure surfaces, and at least one control valve,
- the method comprising:
- varying the pressure medium flows acting on the working pressure surfaces of the percussion piston, by means of the control valves, so as to produce a reciprocating impact and return motion according to the operating cycle of the percussion piston, and for delivering impacts on a tool arranged in the impact direction of the percussion piston,
- and wherein the method further comprises the steps of
- measuring the position of the percussion piston by means of at least one sensor during an operating cycle and transmitting the measurement data to a control unit of the impact device;
- generating an electric control signal in the control unit, on the basis of the position of the percussion piston and on the control parameters supplied to the control unit for controlling an electrically driven control valve;
- and
- guiding the pressure medium, under the control of the electrically driven control valve, to act on the working pressure surfaces of the percussion piston, and away from them for controlling the operating cycle of the impact device.
5 more elements
An impact device for rock breaking comprising:
- a frame,
- a percussion piston,
- working pressure surfaces formed on the percussion piston and acting in the impact direction and in the return direction,
- working pressure ducts and discharge ducts for guiding the pressure medium,
- at least one control valve for guiding the pressure medium from the working pressure duct to act on the working pressure surfaces of the percussion piston, and away from them into the discharge duct so as to reciprocate the percussion piston in relation to the frame and deliver blows on a tool arranged in the impact direction of the percussion piston,
- the impact device further comprises:
- at least one sensor for determining the position of the percussion piston in relation to the frame;
- an electrically driven control valve;
- a control unit;
- and wherein
- the control unit is arranged to generate a control signal on the basis of measurement data received from the sensor and control parameters supplied to the control unit for controlling the electrically driven control valve;
- and the electrically driven control valve is arranged to guide the pressure medium to act on the working pressure surfaces of the percussion piston, and away from them for controlling the operating cycle of the impact device.
9 more elements
Dependencies are inferred from the claim text.