Pressure-retaining cap screwing and unscrewing device for marine natural gas hydrate pressure-retaining rock-core barrel

Patent metadata

Field	Value
Publication number	US-10947800-B2
Application number	US-202016833584-A
Country	US
Kind code	B2
Filing date	Mar 28, 2020
Priority date	Oct 18, 2018
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

The present disclosure discloses a pressure-retaining cap screwing and unscrewing device for a marine natural gas hydrate pressure-retaining rock-core barrel, wherein it comprises a cap-unscrewing chuck, a support cylinder, a pressure-retaining cap screwing and unscrewing head, a spring, a screwing and unscrewing shaft, and a pressure-retaining cap screwing and unscrewing sleeve, a reducer and a motor; an input shaft of the reducer is connected to the motor, an output shaft of the reducer is the screwing and unscrewing shaft which is a tubular structure with a plurality of guide holes provided on a side wall thereof. The device is simple in structure, compact, light in weight, and convenient to control, and the pressure-retaining cap can be discarded.

First claim

What is claimed is:

1. A pressure-retaining cap screwing and unscrewing device for a marine natural gas hydrate pressure-retaining rock-core barrel, wherein the pressure-retaining cap screwing and unscrewing device comprises a cap-unscrewing chuck, a support cylinder, a pressure-retaining cap screwing and unscrewing head, a spring, a screwing and unscrewing shaft, and a pressure-retaining cap screwing and unscrewing sleeve, a reducer and a motor; an input shaft of the reducer is connected to the motor, an output shaft of the reducer is the screwing and unscrewing shaft which is a tubular structure with a plurality of guide holes provided on a side wall thereof; a bottom of the screwing and unscrewing shaft is fixed with a connecting head; an end of the pressure-retaining cap screwing and unscrewing head facing the screwing and unscrewing shaft is provided with a blind hole, a top of the blind hole is provided with a guide hole, the top of the blind hole is connected to a boss on a side wall of the screwing and unscrewing shaft through a spring, a top surface of the pressure-retaining cap screwing and unscrewing head is provided with a plurality of forks, the pressure-retaining cap screwing and unscrewing head is coaxial with the screwing and unscrewing shaft; the pressure-retaining cap screwing and unscrewing sleeve is mounted on the screwing and unscrewing shaft and is located outside of the pressure-retaining cap screwing and unscrewing head, a guide plate on an outer wall of the pressure-retaining cap screwing and unscrewing head is mounted in a guide groove of the pressure-retaining cap screwing and unscrewing sleeve; the support cylinder is mounted on the reducer and is located outside of the pressure-retaining cap screwing and unscrewing sleeve; and a top of the support cylinder is mounted with the cap-unscrewing chuck.

2. The pressure-retaining cap screwing and unscrewing device for the marine natural gas hydrate pressure-retaining rock-core barrel according to claim 1 , wherein a bottom of the pressure-retaining cap screwing and unscrewing sleeve is provided with a polygonal hole, a polygonal boss is provided on the screwing and unscrewing shaft where the screwing and unscrewing sleeve is mounted, the pressure-retaining cap screwing and unscrewing sleeve is mounted on the screwing and unscrewing shaft through cooperation of the polygonal hole of the pressure-retaining cap screwing and unscrewing sleeve with the polygonal boss of the screwing and unscrewing shaft.

3. The pressure-retaining cap screwing and unscrewing device for the marine natural gas hydrate pressure-retaining rock-core barrel according to claim 1 , wherein the cap-unscrewing chuck comprises a chuck case, two slip bases and two chuck oil cylinders, top and bottom plates of the chuck case are respectively provided with guide holes through which the marine natural gas hydrate pressure-retaining rock-core barrel can pass, the two slip bases are oppositely arranged in the chuck case, facing ends of the two slip bases are each provided with a V-shaped groove composed of three planes, and one of planes of the V-shaped groove which located in the bottom of the V-shaped groove is parallel to a side surface of the slip base 106 ; opposite ends of the two slip bases are respectively connected with piston rods of the two chuck oil cylinders, piston rods of the two chuck oil cylinders are coaxial, and the chuck oil cylinders are mounted on the chuck case.

4. The pressure-retaining cap screwing and unscrewing device for the marine natural gas hydrate pressure-retaining rock-core barrel according to claim 3 , wherein each of the three planes of the V-shaped groove on the slip base is provided with alloy slip.

5. The pressure-retaining cap screwing and unscrewing device for the marine natural gas hydrate pressure-retaining rock-core barrel according to claim 1 , further comprising a base which is provided with two lifting oil cylinders, a piston rod of the lifting oil cylinder is connected to the reducer; the base is further provided with a high-pressure water pump, a water outlet of the high-pressure water pump is connected with a connector fixed at a bottom of the screwing and unscrewing shaft through a water pipe.

Assignees

• Univ Hunan Science & Technology

Inventors

• Wan Buyan
• Huang Xiaojun
• Jin Yongping

Classifications

• E21B19/10

  Slips; Spiders {; Catching devices (rotary tables with master bushing or kelly bushing E21B3/04)} · CPC title

• E21B49/025

  of underwater soil, e.g. with grab devices · CPC title

• E21B25/04

  the core receiver having a core forming cutting edge or element, e.g. punch type core barrels · CPC title

• E21B25/18 Primary

  the core receiver being specially adapted for operation under water · CPC title

• E21B19/163 Primary

  piston-cylinder actuated · CPC title