Fidelity retaining type coring device for rock sample

A fidelity-retaining coring device for a rock sample, characterized in that the device comprises a rock core drilling tool, a rock core sample storage barrel, and a rock core sample fidelity-retaining cabin. The rock core drilling tool comprises a coring drilling tool, a core catcher, and an inner core pipe;

• the coring drilling tool comprises an outer core pipe and a hollow drill bit, and the drill bit is connected to the lower end of the outer core pipe;
• the core catcher comprises an annular base and a plurality of jaws, in which the annular base is coaxially mounted on the inner wall of the lower end of the inner core pipe, and the jaws are uniformly arranged on the annular base. The lower end of the jaws is connected with the annular base, and the upper end of the jaws is closed inward;
• the lower end of the inner core pipe extends to the bottom of the outer core pipe, and the inner core pipe is in clearance fit with the outer core pipe;
• said core sample storage barrel comprises a rock core barrel, a drilling machine outer cylinder, a flap valve and a trigger mechanism. The flap valve comprises a valve seat and a sealing flap, the valve seat is coaxially mounted on the inner wall of the drilling machine outer cylinder, and one end of the sealing flap is movably connected to the outer sidewall of the upper end of the valve seat;
• the top of the valve seat is provided with a valve port sealing surface matched with the sealing flap. The rock core sample fidelity-retaining cabin comprises an inner coring barrel, an outer coring barrel, and an energy accumulator. The outer coring barrel is sleeved on the inner coring barrel;
• the upper end of the inner coring barrel is communicated with a liquid nitrogen storage tank, and the liquid nitrogen storage tank is located in the outer coring barrel;
• the energy accumulator is communicated with the outer coring barrel;
• the outer coring barrel is provided with a flap valve.