دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a part of the brake mechanism consisting of a flexible steel band lined with a material that grips a drum when tightened. On a drilling rig, the brake band acts on the flanges of the drawworks drum to control the lowering of the travelling block and its load of drill pipe, casing, or tubing.

n: Bourdon plate whose inner surface is installed with several brake blocks at definite interval.

n: a section of the lining of a brake band shaped to conform to the curvature of the band and attached to it with countersunk screws. See brake band.

n: The heatproof, abrasion proof, and high friction coefficient blocklike component part. Made by material pressure stencil or plait pressure stenci. Fixed in the inner surface with head screw. The friction produced by contact of brake drum when working.

n: Matched with brake block and brake staple. It is the circular ring particular cast steel connected with two ends of cylinder.

n: the part of the brake that presses on the brake drum. On the drawworks, the circular series of brake blocks are bolted to the brake bands with counter- sunk brass bolts;the lining is the frictional, or gripping, element of a mechanical brake.

n: Refers to the lining of brake staple which is consisted of a set of brake blocks. Fixed in the inner surface of brake staple with head aluminium screw. Brake lining stops when the surface of brake holds the brake drum.

n: two bands fined with brake pads;the bands fit over the two rims of the drawworks drum. When the driller engages this brake, the pads press down on the rims to stop the drum from hoisting or from letting out drilling line. The main brake also keeps the drum from rotating (and therefore holds the drill stem stationary) when making up or breaking out drill pipe.

n: the brake that resorts the friction of brake block and brake drum. Mainly formed by lever, brake staple, brack block and balance beam.