Mechanical apparatus for removing a copper Tuyere or Tymp from a shaft or blastfurnace
Publication Date: 2003-Feb-12
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The invention described in this disclosure is a simple mechanical device adapted for the removal of a water-cooled tubular copper tuyere fitted into a blast furnace cooling ring, commonly known as a tymp. Also disclosed is a second version of the device adapted for the removing a water-cooled copper tymp, frictionally held in a rosette ring surrounding a hot air injection port in a blastfurnace. The tuyere removal device consists of a gripper on the end of a long threaded shaft, which passes through a central hole in a yoke or web, designed to be affixed to the outer perimeter of a rosette ring surrounding a blastfurnace hot air injection port. A separate coaxial wedge is slid down the length of the free end of the shaft and jammed against the interior wall of the tuyere, thereby locking the gripper securely to the outer tip of the tuyere. A threaded nut is placed on the free end of the shaft and is rotated until it makes contact with the surface of the yoke. A conventional pneumatic explosive-actuated tool is fitted over the nut and rotated, such that the nut bears on the yoke, creating a tractive force on the gripper, which is in contact with the end of the tuyere, resulting in extraction of the tuyere from the tymp. Alternately, the tymp removal device consists of a narrow steel plate having a central opening, and a plate length slightly larger than the diameter of the tymp opening extending into the blastfurnace. After placing the opening in the plate, coaxially on the shaft, the plate is slid diagonally along the shaft into the tymp and is allowed to enter the furnace interior suspended by the end of the shaft. The shaft end is enlarged, so that the plate can not pass over the end of the shaft and fall off into the furnace. The shaft is then retracted, causing the plate to abut the enlarged end of the shaft, so that the plate is made to bridge across the inner opening of the tymp. A threaded nut is placed on the free end of the shaft and rotated until it makes contact with the surface of the yoke, forcing the plate on the end of the shaft to be compressed against the end of the tymp extending into the blastfurnace. A conventional pneumatic explosive-actuated tool is fitted over the nut and rotated, such that the nut bears on the yoke creating a tractive force on the steel plate bridging the interior opening of the tymp, thereby extracting the tymp from the rosette plate.