Apparatus, rock drilling rig and method for rock drilling

Patent metadata

Field	Value
Publication number	US-10151191-B2
Application number	US-201615265008-A
Country	US
Kind code	B2
Filing date	Sep 14, 2016
Priority date	Sep 15, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

An apparatus, rock drilling rig and method for rock drilling includes a turning device for moving a drilling tool around longitudinal axis of the tool. The turning movement is controlled by an alternating turning system so that direction of turning movement is continuously reversed to first and second turning directions. The turning angle of the tool is restricted and a safety system (is configured to monitor the operation and to ensure that a predetermined turning angle is not exceeded.

First claim

The invention claimed is:

1. An apparatus for rock drilling comprising:
a rock drilling machine and a longitudinal drilling tool connectable to the rock drilling machine, the rock drilling machine including a turning device for moving the drilling tool around a longitudinal axis of the drilling tool;
at least one alternating turning system for controlling the turning device to reverse direction of movement of the drilling tool repeatedly and thereby generating allowed predetermined turning movements in a first turning direction and correspondingly in a second turning direction; and

at least one separate safety system configured to secure independently relative to the turning device a magnitude of realized turning movements that are always below the allowed predetermined turning movements.

2. The apparatus as claimed in claim 1 , wherein the safety system is configured to monitor operation of the alternating turning system, the safety system being configured to stop operation of the turning device in response to detected deviation in the operation of the alternating turning system.

3. The apparatus as claimed in claim 2 , wherein the turning device is a pressure medium operated turning actuator, the alternating turning system including at least one control valve for controlling pressure prevailing in pressure medium ports of the turning device, whereby the turning direction of the turning device is reversed in response to operation of the control valve, and wherein the safety system of the apparatus is configured to monitor operation of the control valve.

4. The apparatus as claimed in claim 3 , wherein the safety system includes at least one electrical monitoring element arranged in connection with the control valve for monitoring operation of the control valve.

5. The apparatus as claimed in claim 1 , wherein the turning device of the rock drilling machine is a pressure medium operated motor.

6. The apparatus as claimed in claim 1 , wherein the turning device of the rock drilling machine is a hydraulic motor, the turning device being connected to a hydraulic circuit by at least one pressure medium duct, the alternating turning system including at least one control valve for controlling pressure medium flow in the mentioned pressure ducts, the safety system including at least one additional second hydraulic motor connected to the at least one pressure medium duct, whereby the second hydraulic motor is series-connected with the hydraulic turning device and a magnitude of the realized turning movements of the additional second hydraulic motor is mechanically limited, whereby the additional second hydraulic motor is configured to prevent the turning device from exceeding allowed predetermined turning movements.

7. The apparatus as claimed in claim 1 , wherein the safety system includes at least one sensing device for detecting a turning angle of the produced turning movement, which is directed to the drilling tool, the safety system being provided with at least one maximum turning angle limit and the safety system being configured to stop the turning in response to detected exceed of the maximum turning angle limit.

8. The apparatus as claimed in claim 1 , wherein the safety system includes at least one sensing device for detecting realized turning movement of the drilling tool or shank, the safety system being configured to calculate a magnitude of realized turning angle of the drilling tool on a basis of detection data, the safety system being provided with at least one maximum turning angle limit and the safety system is configured to stop operation of the turning device in response to detected exceed of the maximum turning angle limit, whereby the magnitude of the realized turning movement of the drilling tool is always below the allowed predetermined turning movements.

9. The apparatus as claimed in claim 1 , wherein the safety system includes at least one sensing device mounted to the rock drilling machine for detecting realized turning movement of the turning device, the safety system being configured to calculate a magnitude of realized turning angle of the drilling tool on a basis of detection data of the rock drilling machine, the safety system being provided with at least one maximum turning angle limit and the safety system is configured to stop operation of the turning device in response to detected exceed of the maximum turning angle limit, whereby the magnitude of the realized turning movement of the drilling tool is always below the allowed predetermined turning movements.

10. The apparatus as claimed in claim 1 , wherein the turning device of the rock drilling machine is a hydraulic motor, the turning device being connected to a hydraulic circuit by pressure ducts, the alternating turning system having at least one control valve, the safety system including at least one dosing cylinder mechanism connected to the pressure ducts of the hydraulic motor, wherein the control valve is configured to control reciprocating motion of the dosing cylinder mechanism, and each stroke of the dosing cylinder mechanism is configured to dose limited volume of hydraulic fluid to the hydraulic motor, whereby the dosed batches of hydraulic fluid are configured to generate limited turning movements for the hydraulic motor.

11. The apparatus in claim 1 , wherein the turning device of the rock drilling machine is a pressure medium operated turning actuator connected to a pressure medium system by means of pressure medium lines, the safety system including at least one sensing device configured to sense properties of pressure medium in at least one pressure medium line connected to the pressure medium operated turning actuator and the safety system is configured to monitor the operation of the alternating turning system by means of the sensed data.

12. The apparatus as claimed in claim 11 , wherein the safety system includes at least one flow sensing device arranged to detect pressure medium flow conveyed to the turning actuator and the safety system is configured to monitor the operation of the alternating turning system by means of the sensed flow data.

13. The apparatus as claimed in claim 11 , wherein the safety system includes at least one pressure sensing device arranged to detect pressure in at least one pressure medium line of the turning actuator and the safety system is configured to monitor the operation of the alternating turning system by means of the sensed pressure data.

14. A rock drilling rig, comprising:
a movable carrier; and
at least one drilling boom provided with at least one drilling unit having a rock drilling machine and a feed device for moving the rock drilling machine, the rock drilling machine including a turning device for moving a drilling tool around a longitudinal axis of the drilling tool, at least one alternating turning system for controlling the turning device to reverse direction of movement of the drilling tool repeatedly and thereby generating allowed predetermined turning movements in a first turning direction and correspondingly in a second turning direction, and at least one separate safety system configured to secure independently relative to the turning device a magnitude of realized turning movements that are always below the allowed predetermined turning movements.

15. A method for rock drilling, wherein drill hole is drilled by a rock drilling machine and a drilling tool connected to the rock drilling machine, the method comprising:
providing a rock drilling machine and a turning device to turn the drilling tool around a longitudinal axis of the drilling tool during the drilling in a turning m

Assignees

• Sandvik Mining & Construction Oy

Inventors

• Viitaniemi Jarno
• Lahdelma Ilkka
• Kiviniemi Tommi
• Leskinen Martti
• Huikkola Miika

Classifications

• E21B44/00 Primary

  Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions · CPC title

• E21B41/0021 Primary

  Safety devices, e.g. for preventing small objects from falling into the borehole · CPC title

• E21B7/025

  Rock drills, i.e. jumbo drills · CPC title

• E21B7/022

  Control of the drilling operation; Hydraulic or pneumatic means for activation or operation (control circuits for drilling masts E21B15/045) · CPC title

• E21B4/02

  Fluid rotary type drives · CPC title