Boring or penetrating the earth – Automatic control
Patent
1993-03-29
1994-01-18
Bui, Thuy M.
Boring or penetrating the earth
Automatic control
E21B 700
Patent
active
052793729
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of drilling holes in rock according to a predetermined scheme in order to loosen blocks Of desired shape, wherein the holes are drilled by means of a rock drilling equipment comprising a carrier; a boom attached to the carrier turnably with respect to it; a feeding beam attached to the end of the boom, a drilling machine being arranged to move along the feeding beam during drilling; sensors for indicating the position of the feeding beam and the boom with respect to the carrier; and a control unit which calculates the position and drilling direction of a drill bit on the basis of the values measured by the sensors.
When drilling holes for quarrying stone for further processing in open pits, the purpose is to loosen stone in rectangular blocks of predetermined dimensions by drilling holes in a row in the rock in a predetermined direction, whereby the rock breaks along this row in blasting. Today such rows of holes are drilled by means of a so-called line drilling equipment comprising a long frame structure with one or more drilling machines. The drilling machines move in the longitudinal direction of the frame structure or the line beam in such a way that the drilled holes are always positioned in a straight line.
This kind of equipment is mechanically difficult to handle as it is heavy and a heavy lifting platform or transport means is needed to displace it in position in the drilling site. Furthermore, it is difficult and laborious to align the equipment to obtain a desired line of holes, and the alignment of the drilling machines in a desired plane of holes is difficult. In addition, the mechanics and structure of the present equipment depend on whether rows of holes or individual holes are to be drilled.
The object of the present invention is to provide a method by means of which both holes in a row and individual holes or hole fields can be drilled easily and simply with a light equipment which is easy to locate and align for drilling. The method according to the invention is characterized in that a row of holes is drilled by positioning the drill bit at the starting point of a hole to be positioned at one end of the row of holes; storing the starting point of the hole in the memory of the control unit On the basis of the position of the drill bit; displacing the drill bit to the starting point of the last hole in the row of holes; storing the starting point of the last hole in the memory of the control unit on the basis of the position of the drill bit; setting at least such drilling parameters as the direction and the number of the holes or a spacing between two adjacent holes in the control unit; whereby a calculating means in the control unit calculates the position of the starting points of the holes and, by means of the drilling parameters, the position of all of the holes with respect to the carrier, whereafter the rock drilling equipment drills the holes automatically on the basis of the calculated positional values and the preset parameters.
The basic idea of the invention is that a row or pattern of holes is determined in such a way that the drill bit is positioned at holes positioned at the ends of the rows of holes to be drilled by turning the boom and the feeding apparatus of the drilling equipment, and the position of each such hole with respect to the carrier of the equipment is determined on the basis of the position of the drill bit when it is positioned at the hole, whereafter the direction and depth of the holes to be drilled and the spacing of holes or the number of holes in a row are given, and an automatic control unit then calculates the direction and drilling depth of the boom and the feeding beam, and drills the holes in accordance with the given scheme. Correspondingly, for example, a field of holes with a predetermined spacing of holes both in the transverse and in the longitudinal direction can be determined by positioning the drill bit at holes to be positioned at the corners of the field and determining their position, and then similarly
REFERENCES:
patent: 3906726 (1975-09-01), Jameson
patent: 4343367 (1982-08-01), Mashimo
patent: 4407017 (1983-09-01), Zhilikov et al.
patent: 4601000 (1986-07-01), Montabert
patent: 4639868 (1987-01-01), Tanaka et al.
Bui Thuy M.
Tamrock Oy
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