Tool driving or impacting – Processes
Patent
1993-03-29
1995-01-24
Smith, Scott A.
Tool driving or impacting
Processes
173190, E21C 1100
Patent
active
053835247
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method of aligning the feeding beam of a rock drilling equipment with a hole to be drilled, wherein the inclination of the feeding beam is measured in the direction of two vertical measuring planes at an angle with respect to each other by means of two gravity-operated sensors responsive to the position of the feeding beam, each sensor indicating the inclination of the feeding beam in the direction of one of the planes, and the feeding beam is turned so as to position the drill rod in a desired drilling direction by adjusting the inclination of the feeding beam with respect to the measuring planes on the basis of the values of the angles of inclination obtained by means of the sensors.
The invention is also concerned with rock drilling equipment for realizing the method described above the equipment comprising a carrier, a boom mounted to the carrier rotatably by means of joints, and a feeding beam for a drilling machine, the feeding beam being mounted to the end of the boom turnably about joints perpendicular to each other, two gravity-operated inclination sensors for measuring the inclination of the feeding beam with respect to two vertical measuring planes at an angle with respect to each other, and display means for indicating inclination angle values measured by the sensors.
BACKGROUND
To drill holes in rock, the feeding beam is positioned in parallel with a plane defined by the row of holes to be drilled, especially when loosening rock for further processing. Similarly, in some cases, it is desirable to drill holes in systematic, regular fields in order to be able to perform the blasting as efficiently and accurately as possible. To drill a row of holes in a predetermined direction, the drilling direction is usually determined in x and y planes vertical and perpendicular to each other. Typically, the object is to carry out the drilling in such a way that the y plane is parallel to the longitudinal axis of the carrier, and the x plane is perpendicular to it in order that the drill rod could be positioned more easily in a desired direction. The positioning is typically carried out by means of aligners of different types.
To determine the position of the feeding beam, it is known to use gravity-operated sensing means, whereby the purpose is to detect the direction of the feeding beam with respect to the vertical direction. Such means are described e.g. in SE Patent 392 319, which discloses a sensor box attached to the feeding beam and containing a gravity-operated sensor. This sensor box provides both x-direction and y-direction angle display on a screen positioned in front of the driller. In order to allow for the direction of the boom with respect to the carrier, the sensor box is attached to the feeding beam rotatably about an axis parallel to the drill rod, and the driller can turn the sensor box in proportion to the turning of the boom in such way that the measuring directions of the sensors remain unchanged in relation to the original vertical plane.
GB Patent 1 325 240, in turn, discloses an arrangement in which the feeding beam comprises a control valve, which is operated in response to by a gravity-operated weight sensor and which controls the turning cylinders of the feeding beam during the movement of the boom in such a way that the position of the feeding beam remains substantially unchanged. In this arrangement, the feeding beam and thus the drill rod are first turned to a desired angular position with respect to the end of the boom, whereafter the gravity-operated control valve is positioned vertically and fastened in place. When the displacement of the boom causes the position of the feeding beam to deviate from the original position, the gravity-operated sensor connects one or more of the cylinders turning the feeding beam in operation until the feeding beam has returned to its original direction.
It is also known e.g. from U.S. Pat. No. 4,514,796 and FR Patent 82 00 648 to calculate the direction of the drill rod with respect to the carrier
REFERENCES:
patent: 4288056 (1981-09-01), Bergstrom
patent: 4343367 (1982-08-01), Mashimo
patent: 4484637 (1984-11-01), Mayer
patent: 4499953 (1985-02-01), Molin
patent: 4514796 (1985-04-01), Saulters et al.
patent: 4601000 (1986-07-01), Montabert
patent: 4698570 (1987-10-01), Satoh
Smith Scott A.
Tamrock Oy
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