Drilling unit, method for slot drilling and slotting device
AssigneeSandvik Mining and Construction Oy
InventorMaunu Mänttäri
Life of this patent
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Abstract
A slotting device (100) to be used with a rock drilling apparatus (1) to drill closely together a plurality of parallel intersecting holes so as to form a slot in a brittle material, such as rock, masonry or concrete. The slotting device (100) includes a guide portion (110) connected to a body portion (120) with at least one strut (130). The guide portion (110) is disposed in a previously drilled hole, and the body portion (120) and a rotary percussion tool (7) mutually define a variable volume chamber (140) that contains flushing fluid that damps transmission of impact stress waves from a percussion device (4) of the drilling apparatus (1) to the slotting device (100).
Claims22
A rock drilling unit for slot drilling, comprising
- a feed beam,
- a rock drilling machine arranged on the feed beam, and comprising a percussion device and a flushing device,
- a tool connected to the rock drilling machine,
- and wherein the percussion device is arranged to produce impact stress waves directed to the tool, and the flushing device is arranged to supply flushing fluid through the tool for flushing drilling waste from a hole being drilled,
- a feeding device, which is arranged to move the drilling machine on the feed beam and to feed the tool in the hole being drilled,
- a slotting device connected to the rock drilling machine and comprising a guide portion, a body portion and at least one strut extending between and coupling the guide portion and body portion, and wherein the guide portion is disposed in a previously drilled hole, and wherein the tool is arranged slidingly through the body portion,
- and between the body portion of the slotting device and the tool there is at lest one axial volume chamber containing fluid so as to dampen transmission of the impact stress waves from the percussion device to the slotting device.
A slotting device comprising:
- an elongated tool including a first end and a second end, and wherein the first end is provided with first coupling means for attaching the slotting device to a shank of a drilling machine or to a drill rod connected to the shank, and wherein the second end is provided with a drill bit,
- a body portion through which the tool is arranged,
- a guide portion disposable in a previously drilled hole, and
- at least one strut extending between and coupling the guide portion and body portion,
- and the slotting device is provided with at least one axial volume chamber between the body portion and the tool, and
- wherein the slotting device comprises at least one flow channel for directing fluid into the chamber, whereby the fluid in the chamber is arranged to transmit axial forces from the tool to the body portion.
A method for slot drilling, comprising:
- drilling closely together a plurality of holes so as to form a slot in a rock material,
- using in drilling a rock drilling machine comprising a percussion device for generating percussion pulses to a tool connected to a rock drilling machine,
- connecting a slotting device to the rock drilling machine, the slotting device comprising:
- a body portion through which the tool is arranged, a guide portion, and at least one strut extending between and coupling the guide portion and body portion,
- disposing a guide portion in a previously drilled hole for maintaining the course of the previously drilled hole for the new hole being drilled, and
- transmitting during drilling a feed force towards the drilling direction from the tool to the body portion of the slotting device and further to the guide portion,
- transmitting the feed force to the body portion of the slotting device in the drilling direction by means of fluid in at least one axial volume chamber between the tool and the body portion, and
- dampening transmission of the impact stress waves from the percussion device to the slotting device by means of the fluid in the at least one axial volume chamber.
Dependencies are inferred from the claim text.