US 11,905,775 B2
Driving system for core drilling rig
Mingzhong Gao, Sichuan (CN); Heping Xie, Sichuan (CN); Ling Chen, Sichuan (CN); Jun Guo, Sichuan (CN); Zhilong Zhang, Sichuan (CN); Zetian Zhang, Sichuan (CN); Yiqiang Lu, Sichuan (CN); Cong Li, Sichuan (CN); and Zhiqiang He, Sichuan (CN)
Assigned to SHENZHEN UNIVERSITY, Guangdong (CN); and SICHUAN UNIVERSITY, Sichuan (CN)
Appl. No. 17/309,234
Filed by SHENZHEN UNIVERSITY, Guangdong (CN); and SICHUAN UNIVERSITY, Sichuan (CN)
PCT Filed Nov. 12, 2018, PCT No. PCT/CN2018/114964
§ 371(c)(1), (2) Date Mar. 11, 2022,
PCT Pub. No. WO2020/093412, PCT Pub. Date May 14, 2020.
Claims priority of application No. 201811327012.X (CN), filed on Nov. 8, 2018.
Prior Publication US 2022/0213745 A1, Jul. 7, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 25/02 (2006.01); E21B 23/04 (2006.01); E21B 4/02 (2006.01); E21B 4/18 (2006.01); E21B 21/10 (2006.01); E21B 25/00 (2006.01)
CPC E21B 23/0418 (2020.05) [E21B 4/02 (2013.01); E21B 4/18 (2013.01); E21B 21/10 (2013.01); E21B 25/00 (2013.01); E21B 25/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A driving system for a core drilling rig, comprising:
a driving motor (7) and a fluid activation module,
wherein the driving motor (7) comprises an outer rotor (73) and an inner stator (75), and mutually-matched convex ribs (77) are provided on an inner wall of the outer rotor (73) and an outer wall of the inner stator (75), wherein the outer rotor (73) and the inner stator (75) are in clearance fit and a clearance between the outer rotor (73) and the inner stator (75) is a driving liquid channel (74), wherein a length of the outer rotor (73) is less than that of the inner stator (75), wherein the outer rotor (73) is provided between a front end and a rear end of the inner stator (75), wherein outer rotor (73) is connected to an outer cylinder (23), and the rear end of the inner stator (75) is connected to a coupling (76),
wherein the fluid channel activation module is disposed behind the inner stator (75) and comprises a lock body (11), a locking rod (12), and a start shear pin (13),
wherein a locking rod (12) is in the lock body (11), and the locking rod (12) and the lock body (11) are connected by the start shear pin (13), wherein a central rod (14) is in the locking rod (12), while a sealing section A (112) of the lock body (11) and a sealing section B (123) of the locking rod (12) are in a sealing fit, the sealing section B (123) is in a sealing fit with the central rod (14), a fluid channel A (41) is disposed between the central rod (14) and the locking rod (12), and the locking rod (12) has an outflow hole A (1221) on an outer wall thereof, wherein the outflow hole A (1221) is disposed behind the sealing section B (123), wherein a fluid channel B (42) is disposed between the lock body (11) and the locking rod (12), and in front of the sealing section A (112), wherein an opening of the outflow hole A (1221) is at the sealing section A (112), and a front end of the fluid channel A (41) is sealed, a front of the lock body (11) is connected to the inner stator (75), and a front of the fluid channel B (42) is connected to the driving liquid channel (74).