Measuring device, rock breaking device and method of measuring stress wave
AssigneeSandvik Mining and Construction Oy
InventorsMarkku Keskiniva, Vesa Uitto, Heimo Ihalainen, Jukka Lekkala
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Abstract
The invention relates to a method of measuring a stress wave and to a measuring device and a rock breaking device. A percussion device (7) gives impact pulses to a waveguide (21), where a compression stress wave and a reflected tensile stress wave are generated, which propagate in the waveguide. The compression stress wave causes an extension in the waveguide and the tensile stress wave a thinning, in which case properties of the waveguide may be determined by measuring geometric changes in the cross section of the waveguide. The measurement data are utilized in controlling the rock breaking device.
Claims11
A method of measuring a stress wave used in rock breaking, the method comprising:
- measuring a stress wave which propagates in a waveguide;
- determining a geometric change in the cross section of the waveguide as the stress wave passes a measuring point;
- determining the geometric change in the cross section of the waveguide without a mechanical contact between the measuring member and the waveguide;
- and
- determining properties of the stress wave from the change in the cross section.
A measuring device for measuring a stress wave, the device comprising:
- at least one contact-free measuring member for detecting without a mechanical contact a change in the cross section of a waveguide due to the influence of the stress wave;
- and
- at least one control unit for processing measurement results,
- wherein the control unit is arranged to determine properties of the measured stress wave from the change in the cross section of the waveguide.
A rock breaking device comprising:
- a frame;
- a tool;
- a device for generating stress waves in the tool;
- measuring means for measuring the stress wave travelling in the tool;
- at least one control unit for controlling the rock breaking device on the basis of the measured stress wave,
- contact-free means for detecting without a mechanical contact a geometric change in the cross section of the tool due to the influence of the stress wave;
- and
- wherein at least one control unit is arranged to determine properties of the stress wave on the basis of the change in the cross section of the tool for controlling the rock breaking device.
Dependencies are inferred from the claim text.