IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0372237
(1982-04-26)
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우선권정보 |
NO-811458 (1981-04-29) |
발명자
/ 주소 |
|
출원인 / 주소 |
- Ingenior Thor Furuholmen A/S
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
6 인용 특허 :
5 |
초록
▼
The feed support of a rock drilling unit is adjusted to be a given distance from a rock surface wherein holes are to be drilled. A drill bit is moved into abutment with the rock surface. The feed support is moved relative to the bit toward the rock surface. Such movement is stopped when a depth meas
The feed support of a rock drilling unit is adjusted to be a given distance from a rock surface wherein holes are to be drilled. A drill bit is moved into abutment with the rock surface. The feed support is moved relative to the bit toward the rock surface. Such movement is stopped when a depth measuring instrument determines that the feed support is at a position spaced the given distance from the rock surface.
대표청구항
▼
1. A method for positioning at a predetermined distance from a rock surface into which holes are to be drilled a feed support of a rock drilling unit of the type including a carrier supporting said feed support for longitudinal movement relative thereto, first hydraulic means for moving said feed su
1. A method for positioning at a predetermined distance from a rock surface into which holes are to be drilled a feed support of a rock drilling unit of the type including a carrier supporting said feed support for longitudinal movement relative thereto, first hydraulic means for moving said feed support longitudinally with respect to said carrier, a drilling machine mounted on said feed support for longitudinal movement relative thereto, a drill stem supported by said drilling machine and movable therewith, a drill bit fixed to an end of said drill stem, second hydraulic means for moving said drilling machine, said stem and said bit longitudinally with respect to said feed support, and means for measuring the depth of a drilled hole as a function of the relative position of said drilling machine with respect to said feed support, said method comprising: operating said second hydraulic means and thereby moving said drilling machine, said stem and said bit toward said rock surface until said bit abuts said rock surface; operating said first hydraulic means to move said feed support toward said rock surface, while maintaining said bit in abutment with said rock surface, whereby said feed support moves relative to said drilling machine; and stopping operation of said first hydraulic means and thereby movement of said feed support when said depth measuring means determines that said feed support has reached a position spaced said predetermined distance from said rock surface, as a function of the relative position of said bit, and thereby of said drilling machine, with respect to said feed support. 2. A method as claimed in claim 1, comprising operating said second hydraulic means at a power less than normally employed for drilling. 3. A method as claimed in claim 2, comprising initiating operation of said first hydraulic means after said bit has contacted said rock surface. 4. A method as claimed in claim 2, comprising simultaneously operating said first and second hydraulic means. 5. A method for positioning at a predetermined distance from a rock surface into which holes are to be drilled a feed support of a rock drilling unit of the type including a carrier supporting said feed support for longitudinal movement relative thereto, first hydraulic means for moving said feed support longitudinally with respect to said carrier, a drilling machine mounted on said feed support for longitudinal movement relative thereto, a drill stem supported by said drilling machine and movable therewith, a drill bit fixed to an end of said drill stem, second hydraulic means for moving said drilling machine, said stem and said bit longitudinally with respect to said feed support, and means for measuring the depth of a drilled hole as a function of the relative position of said drilling machine with respect to said feed support, said method comprising: operating said first hydraulic means to move said feed support toward said rock surface, and simultaneously operating said second hydraulic means and thereby moving said drilling machine, said stem and said bit toward said rock surface until said bit abuts said rock surface; when said bit abuts said rock surface, determining from said depth measuring means the relative position of said rock surface as a function of the position of said bit and thereby said drilling machine with respect to said feed support; thereafter, operating said second hydraulic means to withdraw said drilling machine, said stem and said bit from said rock surface, thereby to prevent bending of said stem, while continuing operation of said first hydraulic means and movement of said feed support toward said rock surface; and stopping operation of said first hydraulic means and thereby movement of said feed support upon measurement by said depth measuring means that said feed support has reached a position spaced said predetermined distance from said relative position of said rock surface. 6. In a rock drilling unit for drilling holes in a rock surface, said unit being of the type including a carrier, a feed support mounted on said carrier for longitudinal movement relative thereto, first hydraulic means for moving said feed support longitudinally with respect to said carrier, a drilling machine mounted on said feed support for longitudinal movement relative thereto, a drill stem supported by said drilling machine and movable therewith, a drill bit fixed to an end of said drill stem, second hydraulic means for moving said drilling machine, said stem and said bit longitudinally with respect to said feed support, and means for measuring the depth of a drilled hole as a function of the relative position of said drilling machine with respect to said feed support, the improvement of means for, at the beginning of a drilling operation, positioning said feed support a predetermined distance from the rock surface, said positioning means comprising control means, operatively connected to said first hydraulic means, said second hydraulic means and said depth measuring means, for: operating said second hydraulic means and thereby moving said drilling machine, said stem and said bit toward the rock surface until said bit abuts the rock surface; operating said first hydraulic means to move said feed support toward the rock surface, while maintaining said bit in abutment with the rock surface, whereby said feed support moves relative to said drilling machine; and stopping operation of said first hydraulic means and thereby movement of said feed support when said depth measuring means determines that said feed support has reached a position spaced said predetermined distance from the rock surface, as a function of the relative position of said bit, and thereby of said drilling machine, with respect to said feed support. 7. The improvement claimed in claim 6, wherein said depth measuring means comprises a feeler gauge mounted on said feed support. 8. The improvement claimed in claim 6, further comprising a hydraulic circuit connecting said first and second hydraulic means to a source of hydraulic fluid, and wherein said depth measuring means comprises volumetric quantity measuring means, provided in said circuit between said source and said second hydraulic means, for measuring relative quantities of said fluid supplied to said second hydraulic means. 9. The improvement claimed in claim 8, further comprising pressure gauge means, provided in said circuit, for detecting when said bit abuts the rock surface. 10. In a rock drilling unit for drilling holes in a rock surface, said unit being of the type including a carrier, a feed support mounted on said carrier for longitudinal movement relative thereto, first hydraulic means for moving said feed support longitudinally with respect to said carrier, a drilling machine mounted on said feed support for longitudinal movement relative thereto, a drill stem supported by said drilling machine and movable therewith, a drill bit fixed to an end of said drill stem, second hydraulic means for moving said drilling machine, said stem and said bit longitudinally with respect to said feed support, and means for measuring the depth of a drilled hole as a function of the relative position of said drilling machine with respect to said feed support, the improvement of means for, at the beginning of a drilling operation, positioning said feed support a predetermined distance from the rock surface, said positioning means comprising control means, operatively connected to said first hydraulic means, said second hydraulic means and said depth measuring means, for: operating said first hydraulic means to move said feed support toward the rock surface, and simultaneously operating said second hydraulic means and thereby moving said drilling machine, said stem and said bit toward the rock surface until said bit abuts the rock surface; when said bit abuts the rock surface, determining from said depth measuring means the relative position of the rock surface as a function of the position of said bit and thereby said drilling machine with respect to said feed support; thereafter operating said second hydraulic means to withdraw said drilling machine, said stem and said bit from the rock surface, thereby to prevent bending of said stem, while continuing operation of said first hydraulic means and movement of said feed support toward the rock surface; and stopping operation of said first hydraulic means and thereby movement of said feed support upon measurement by said depth measuring means that said feed support has reached a position spaced said predetermined distance from said relative position of the rock surface. 11. The improvement claimed in claim 10, wherein said depth measuring means comprises a feeler gauge mounted on said feed support. 12. The improvement claimed in claim 10, further comprising a hydraulic circuit connecting said first and second hydraulic means to a source of hydraulic fluid, and wherein said depth measuring means comprises volumetric quantity measuring means, provided in said circuit between said source and said second hydraulic means, for measuring relative quantities of said fluid supplied to said second hydraulic means. 13. The improvement claimed in claim 12, further comprising pressure gauge means, provided in said circuit, for detecting when said bit abuts the rock surface.
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