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: 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: everything from the dead ends of the brake bands to the brake lever.

n: The heaver mechanism used to enlarge force produced by brake crank to satisfy brake cylinder. Made by brake crank and flex links.

n: the end of a brake band that is anchored to the drawworks frame and does not move.

n: 1. a device used with mechanical drawworks brakes to ensure that, when the brakes are used, each brake band will receive an equal amount of tension and also that, in case one brake fails, the other will carry the load. A mechanical brake equaliser is a dead anchor attached to the draw works frame in the form of a yoke attached to each brake band. Some drawworks are equipped with automatic equalisers. 2. any device used to distribute force equally on two pieces of equipment-for example, the pitmans on a beam pumping unit.

n: refer toequalizer bar

n: the end of a flexible steel brake band that is attached to a brake lever by means of a linkage. Moving the brake lever pulls the live end down, and the whole band tightens around the flange. This slows or stops the drum by friction.