Scraping device of pretightening face of connecting bollt for steam turbine cylinder

• Main Authors: YUNFANG HUO, LIANZHONG CHENG, WEI QIAN
• Format: Patent
• Language: English
• Published: 28.06.2006
• Subjects: BROACHING; FILING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOTOTHERWISE PROVIDED FOR; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PLANING; SAWING; SCRAPING; SHEARING; SLOTTING; TRANSPORTING

The utility model provides a scraping device for a pretightened surface of a connecting screw bolt in a steam turbine cylinder, which comprises a scraping cutter body and a cutter edge on the cutter body. The utility model is characterized in that the scraping cutter body is cylindrical, a circular ring-shaped knife edge is arranged on the bottom edge of the scraping knife body, and an annular groove is arranged on the middle position at the top surface of the scraping cutter body. The annular groove is provided with a sliding bearing and a positioning ring which is pressed on the sliding bearing and makes the bearing positioned, the top surface of the scraping cutter body is fixed with an annular press cover and is provided with at least one a guiding rod screw nut which can penetrate the inner part of the scraping cutter body. A screw thread hole of a connecting screw bolt is arranged on the bottom surface of the guiding rod nut, the upper part of the guiding rod nut is provided with an outer screw thread for assembling a fixed nut and the axial line of the guiding rod nut is vertical to a plane which an annular knife edge is positioned at. The utility model has the advantages of simple structure and convenient operation and can ensure the requirements of the pretightened surfaces of connecting screw bolts of front and middle cylinders, the verticality of the screw hole of the screw bolt and the planeness of the pretightened surfaces by scraping.