Variable diameter drill by varying pushing force
A technology of thrust and drill body, which is applied in the field of drilling tools and drilling tools, and can solve problems such as the inability to achieve stable positioning of movable drill bits
Inactive Publication Date: 2014-02-26
HENAN POLYTECHNIC UNIV
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Abstract
The invention discloses a variable diameter drill by varying pushing force. The variable diameter drill comprises an outer drill rod, an inner drill rod, a fixed drill bit and a movable drill bit, an outer locking sleeve and an inner locking sleeve are sleeved on the inner side of an outer sleeve, and abutting ends of the outer locking sleeve and the inner locking sleeve are provided with matched and meshed bevel gears, guide grooves and a pressure spring. A drill tool can be unfolded or folded by varying the pushing force applied to the drill rods, and can be stable under the action of the pressure spring after folded and by being fixed through a locking mechanism after unfolded, so that the external diameter of the drill tool can be expanded at any time.
Application Domain
Drill bits
Technology Topic
Drill bitDrill pipe +2
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