Crane hook group fault detection method

To more effectively improve the overhead Shipbuilding gantry crane lifting capacity, reducing the need for wire rope diameter, the hook is formed integrally with the pulley, which is the hook set. Lifting large spreader, usually selected hook group. Hook set is divided into long and short hook hook group group. When installing a balanced long hook group pulley above, can be used to override the singular pulley block, which play a greater weight. Short pulley double the rate applicable to pulley block, which plays a smaller weight.
Crane hook surface cracks are not allowed, or should be scrapped. Test methods: visual, or 20 times the magnifying glass colored checks. Use of the hook for about 10 years, should be the disintegration of testing and inspection, poor working conditions, frequent use of a crane, every 5 to 6 years of testing that should be checked. Focus on examination of three dangerous section.

Check the hook torsional deformation, when the hook body torsional exceed approximately 10 °, should be scrapped. Inspection method: Measuring crossed method. The overhead Wall mounted jib crane hook on the platform, with a vertical dash feet and adjust power block, horizontal centerline alignment hook shank, find the intersection of the centerline of the hook shank hook tip centerline, from the hook tip the center point of the hook shank to do vertical centerline, the distance to the intersection of the pedal measured out, and then calculates the angle.
Check the amount of wear dangerous section of crane hook, when the actual size of less than 90% of the original size (using GB10051-88 hook new materials of "lifting hook" provides 95%), should be scrapped. Hook nut or insurance are not allowed to wear parts.