Patent ID: 11859450
Assignee: SICHUAN UNIVERSITY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 1:
2. The drilling fluid channel structure of a core drilling rig according to claim 1, further comprising a rear section of the central rod,
wherein the central rod extends through the fluid channel activation module, the pressure relief module, and the flow diverging and blocking module,
wherein the fluid channel activation module comprises a lock body, a locking rod, and a start shear pin, the locking rod being disposed in the lock body, and the locking rod and the lock body being connected connected by the start shear pin, and
wherein the rear section of the central rod is disposed in the locking rod,
wherein the lock body comprises a sealing section A and the locking rod comprises a sealing section B, and the sealing section A and the sealing section B are in a sealing fit, wherein the sealing section B is in a sealing fit with the rear section of the central rod,
wherein a fluid channel A is disposed between the rear section of the central rod and the locking rod, and a back opening of the fluid channel A is at a rear end of the locking rod, the locking rod is provided with an outflow hole A connected to the fluid channel A, the outflow hole A is disposed behind the sealing section B,
wherein a fluid channel B is disposed between the lock body and the locking rod, and the fluid channel B is disposed in front of the sealing section A,
wherein, before the start shear pin is cut, the outlet of the outflow hole A is at the seal section A and the front end of the fluid channel A is sealed, and the start shear pin is cut, the locking rod moves forward, and the outlet of the outflow hole A is disposed in front of the sealing section A so that the fluid channel A and the fluid channel B are connected through the outflow hole A.