Bottom-hole feeding mechanism
A bottom-hole feeding mechanism comprising: a cylinder ( 1 ), a screw spindle ( 2 ) engaging with the cylinder ( 1 ) by means of a non-stopping splined screw pair ( 3 ), a first piston ( 6 ) received within the cylinder ( 1 ) and coupled with the screw spindle ( 2 ) and a hollow rod ( 8 ), an axial spindle ( 4 ) arranged along the cylinder ( 1 ) axis and engaging the cylinder ( 1 ) by means of an axial splined pair ( 5 ), a second piston ( 7 ) rigidly coupled with the axial spindle ( 4 ) and engaging the inner surface of the cylinder ( 1 ) and the outer surface of the hollow rod ( 8 ), wherein the hollow rod ( 8 ), the first piston ( 6 ), the second piston ( 7 ) and the cylinder ( 1 ) form a closed chamber ( 9 ) comprising a throttle ( 10 ), hydraulic channels ( 11 ) on the body of a valve ( 21 ), and a float ( 12 ).
1. A bottom-hole feeding mechanism comprising:
a cylinder ( 1 ),
a screw spindle ( 2 ) coupled to the cylinder ( 1 ) by a non-stopping splined screw pair ( 3 ) and movable within the cylinder ( 1 ) during a drilling process;
a first piston ( 6 ) received within the cylinder ( 1 ) and coupled with the screw spindle ( 2 ) and a hollow rod ( 8 );
an axial spindle ( 4 ) arranged along the cylinder ( 1 ) axis, coupled to the cylinder ( 1 ) by an axial splined pair ( 5 ) and movable within the cylinder ( 1 ) during a drilling process; and
a second piston ( 7 ) rigidly coupled with the axial spindle ( 4 ) and engaging the inner surface of the cylinder ( 1 ) and the outer surface of the hollow rod ( 8 ), wherein
the hollow rod ( 8 ), the first piston ( 6 ), the second piston ( 7 ) and the cylinder ( 1 ) form a closed chamber ( 9 ) comprising a throttle ( 10 ), a check valve ( 12 ) and hydraulic channels ( 11 ) on a body ( 21 ) of the check valve ( 12 ).
2. The bottom-hole feeding mechanism according to claim 1 , wherein the first piston ( 6 ) comprises an O-ring ( 16 ).
3. The bottom-hole feeding mechanism according to claim 1 , wherein the second piston ( 7 ) comprises an O-ring ( 18 ).
4. The bottom-hole feeding mechanism according to claim 1 , wherein the first piston ( 6 ) and the second piston ( 7 ) are engaged with each other by compression springs ( 20 ) received within the closed chamber ( 9 ).
5. The bottom-hole feeding mechanism according to claim 1 , wherein the outer diameter of the hollow rod ( 8 ) differs from the outer diameter of the first piston ( 6 ) and differs from the outer diameter of the second piston ( 7 ).
6. The bottom-hole feeding mechanism according to claim 1 , wherein the cylinder ( 1 ) comprises at least one vent ( 15 , 19 ).
7. The bottom-hole feeding mechanism according to claim 1 , wherein the check valve ( 12 ) comprises a stopper ( 13 ) and a spring ( 14 ).