US 12,091,940 B2
Device for grinding side surface of inner wall of rock borehole
Quan Jiang, Wuhan (CN); Pengfei Chen, Wuhan (CN); Jie Xin, Wuhan (CN); and Herui Zhao, Wuhan (CN)
Assigned to INSTITUTE OF ROCK AND SOIL MECHANICS, CAS, Wuhan (CN)
Filed by Institute of Rock and Soil Mechanics, CAS, Wuhan (CN)
Filed on Sep. 6, 2022, as Appl. No. 17/903,990.
Claims priority of application No. 202210798217.6 (CN), filed on Jul. 6, 2022.
Prior Publication US 2024/0011354 A1, Jan. 11, 2024
Int. Cl. E21B 37/02 (2006.01); E21B 49/00 (2006.01)
CPC E21B 37/02 (2013.01) [E21B 49/006 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A device for grinding a side surface of an inner wall of a rock borehole, comprising a base, wherein a direct current motor is fixedly installed on the base, a right-angle drive steering gear comprises first rotating shafts and a second rotating shaft, one end of the direct current motor is electrically connected to a controller, and the other end of the direct current motor is in drive connection with the second rotating shaft of the right-angle drive steering gear by a universal drive joint, the universal drive joint is configured for connecting the other end of the direct current motor and the second rotating shaft of the right-angle drive steering gear; the controller is connected to an air pressure valve by a cable, and the air pressure valve is connected to an air pump by an air pipe; one end, away from the universal drive joint, of the right-angle drive steering gear is provided with a grinding cylinder, and the grinding cylinder is fixedly installed on the base; both sides of the right-angle drive steering gear are symmetrically provided with a first translation movable plate and a second translation movable plate, and cylinder pistons at both sides of the grinding cylinder are fixedly connected to the first translation movable plate and the second translation movable plate, respectively; one side of the right-angle drive steering gear is fixedly installed on the first translation movable plate, the other side of the right-angle drive steering gear is fixedly installed on the second translation movable plate; the first rotating shafts comprise a first shaft and a second shaft, wherein the first shaft extends from one side of the right-angle drive steering gear and the second shaft extends from an opposite side of the right-angle drive steering gear, and wherein the first shaft and the second shaft respectively penetrate through the first translation movable plate and the second translation movable plate and then are fixedly connected to grinding heads; the air pressure valve is connected to the grinding cylinder by a grinding air pipe; and a displacement sensor electrically connected to the controller is installed on the grinding cylinder.