Mechanism for twisting off drill rod
AssigneeChtc Jove Heavy Industry Company
InventorYanqi He
Life of this patent
Estimating the term…
Abstract
A mechanism for twisting off a drill rod includes a front clamping body (J0) and a rear clamping body (J1) both of which are installed at a fixed bracket. Each of the front clamping body (J0) and the rear clamping body (J1) includes a positioning clamping device and a clamping execution device which are respectively installed at two sides of a clamping centerline (JC) and opposite to each other. The front clamping body (J0) is installed within the first fixed bracket element (80) through a rear fixed shaft. The rear clamping body (J1) is installed within an overturn bracket (6) of the second fixed bracket element (81) through a rear fixed shaft. The positioning clamping device and the clamping execution device of both the front clamping body (J0) and the rear clamping body (J1) are asymmetric to each other.
Claims4
A mechanism for twisting off a drill rod, comprising:
- a front clamping body (J0) and a rear clamping body (J1) which are installed at a fixed bracket, wherein each of the front clamping body and the rear clamping body comprises a positioning clamping device and a clamping execution device which are respectively installed at two sides of a clamping centerline (JC) and opposite to each other;
- the fixed bracket comprises a first fixed bracket element (80) and a second fixed bracket element (81);
- the front clamping body is installed within the first fixed bracket element (80) through a rear fixed shaft;
- the rear clamping body is installed within an overturn bracket (6) of the second fixed bracket element (81) through a rear fixed shaft;
- a rear lower end of the overturn bracket is hinged with a front end of a piston of an overturn oil cylinder (2),
- wherein the positioning clamping device and the clamping execution device of both the front clamping body and the rear clamping body are asymmetric to each other;
- the positioning clamping device has an installation size of B, the clamping execution device has an installation size of A, and a relationship between the installation size B and the installation size A is expressed by a formula of B=A+b, wherein b is a clamping capacity while the clamping execution device tightly clamping the drill rod;
- when the positioning clamping device moves forwardly to a limit position, it is ensured that a clamping center of the positioning clamping device coincides with a center of the breakout mechanism, and at this time, a distance between a center of the rear fixed shaft of the positioning clamping device and a center of the drill rod is defined as the installation size B;
- when the clamping execution device extends outwardly to touch the drill rod and applies a rated clamping force so as to tightly clamp the drill rod, a distance between a center of the rear fixed shaft of the clamping execution device and a clamping center is defined as the installation size A.
Dependencies are inferred from the claim text.