Method and equipment for aligning the feeding beam of a rock drilling equipment

• US 5,383,524 A
• Filed: 03/29/1993
• Issued: 01/24/1995
• Est. Priority Date: 10/08/1990
• Status: Expired due to Term

• Current Assignee: Tamrock Oy (Sandvik AB)
• Original Assignee: Tamrock Oy (Sandvik AB)
• Inventors: Rinnemaa, Heikki
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US08/030,406
• Time in Patent Office: 666 Days
• Field of Search: 173/1, 173/42, 173/44, 173/190, 173/193, 173/195
• US Class Current: 173/1
• CPC Class Codes: E21B 7/022 Control of the drilling operation; Hydraulic or pneumatic means for activation or operation control circuits for drilling masts E21B15/045
• CPC Class Codes: E21B 7/025 Rock drills, i.e. jumbo drills

Abstract

A method of aligning the feeding beam (6) of a rock drilling equipment by gravity-operated sensors (7x, 7y) indicating the inclination of the feeding beam (6). In the method, the angle values (α, β) of the feeding beam (6), indicating by the sensors (7x, 7y) are corrected so that they correspond to the actual angles of inclination of the feeding beam (6). The rock drilling equipment comprises two gravity-operated angle sensors (7x, 7y) measuring inclination in two planes perpendicular to each other. The equipment further comprises a calculator (8) which calculates a difference between the angle value of one angle sensor (7x, 7y) and the actual angle of inclination of the feeding beam (6) in the direction in question on the basis of the angle value obtained by the other angle sensor (7y, 7x) and corrects the value so that it corresponds to the actual inclination of the feeding beam.

Claims

1. A method of aligning a feeding beam component of a rock drilling apparatus with a hole to be drilled wherein the inclination of the feeding beam is measured in two mutually perpendicular vertical measuring planes extending from a first common vertical axis by means of a pair of 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 two mutually perpendicular planes, comprising the steps of:

a) measuring an angle of inclination of the feeding beam in the first vertical measuring plane by a first sensor responsive to movement of the feeding beam in said first vertical measuring plane;

b) measuring a second angle of inclination of the feeding beam in the second vertical measuring plane by a second sensor responsive to movement of the feeding beam in said second vertical measuring plane;

wherein the presence of an angle of inclination in one of the first or second vertical measuring planes causes an error reading in the angle of inclination of the other of the first and second vertical measuring planes;

c) calculating actual first and second corrected angles of inclination for each of the first and second vertical measuring planes, taking into account said error reading; and

d) aligning the feeding beam in a predetermined direction as a function of said first and second actual corrected angles of inclination.

2. The method of claim 1 wherein the feeding beam is mounted to a boom for rotation about a horizontal axis, and wherein said boom is mounted to a carrier for rotation about a vertical axis, and wherein step d) includes positioning an end of the boom to which the feeding beam is attached at a predetermined location above rock to be drilled as a function of a measured angle value between the bottom and the carrier, and aligning the feeding beam with drill holes to be drilled in the rock as a function of the first and second actual corrected angles of inclination calculated in step d).

3. The method of claim 2 and further including, prior to step d) the steps of:

measuring a third angle of inclination of the carrier in a third vertical measuring plane parallel to the first vertical measuring plane by a sensor responsive to movement of the carrier in said third vertical measuring plane;

measuring a fourth angle of inclination of the carrier in a fourth vertical measuring plane parallel to said second vertical measuring plane by a fourth sensor responsive to movement of the carrier in said fourth vertical measuring plane, and wherein said third and fourth vertical measuring planes are angled with respect to each other and perpendicular to a plane of the carrier; and

wherein said third and fourth vertical measuring planes extend from a second common vertical axis; and

further correcting said first and second actual angles of inclination by calculating the influence of the inclination of the carrier in said third and fourth vertical measuring planes on said actual first and second corrected angles of inclination.

4. The method of claim 3 wherein the inclination of the carrier is measured in such a way that the boom and the feeding beam are positioned in a predetermined position with respect to the carrier, and wherein the inclination of the carrier in said third vertical measuring plane extending in the direction of the longitudinal axis of the carrier and perpendicular to the plane of the carrier and correspondingly in said fourth vertical measuring plane extending in the transverse direction of the carrier and perpendicular to the plane of the carrier is measured by means of the first and second sensors.

5. The method of claim 2 wherein the direction of the feeding beam is indicated after calculation as a turning angle about said vertical axis extending through the end of the boom close to the feeding beam and as a direction angle in a plane defined by the turning angle and said vertical axis.

6. The method of claim 2 wherein said first and second sensors are arranged to measure the inclination of the feeding beam relative to said first and second vertical measuring planes in such a way that said first sensor measures inclination of the feeding beam in said first vertical measuring plane extending longitudinally of the boom and perpendicular to the plane of the carrier between a first pivot axis transverse to the feeding beam and a second pivot axis perpendicular to the first pivot axis, whereby turning of the feeding beam about the second pivot axis does not affect the first sensor, and wherein the second sensor is arranged to measure the inclination of the feeding beam with respect to the second pivot axis in said second vertical measuring plane and the plane of the carrier whereby the second angle of inclination obtained by the second sensor is corrected by calculating said angle on the basis of the inclination of the feeding beam measured in said first vertical measuring plane.