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What is the scrap standard of crane parts

by:Powerston     2021-04-09
What is the scrap standard for crane parts? This kind of machinery that handles heavy objects will naturally cause a lot of damage to its parts. Therefore, we must understand the scrap standards of each part in detail and replace the parts in time to make the crane work more safely and efficiently. What is the scrap standard for crane parts? This kind of machinery that handles heavy objects will naturally cause a lot of damage to its parts. Therefore, we must understand the scrap standards of each part in detail and replace the parts in time to make the crane work more safely and efficiently. What is the scrap standard for hooks? Answer: When there are the following defects, they should be scrapped and replaced: (1) Those with cracks, cracks or cracks on the surface should be scrapped; (2) The wear of the dangerous section exceeds 10% of the original size and should be scrapped; (3) Danger Plastic deformation of the section and neck of the hook should be scrapped; (4) The opening degree is increased by 15% than the original size and should be scrapped; (5) The torsional deformation of the hook tip exceeds 10. The above should be scrapped; the scrap standard for forged hooks for cranes: Answer: For forged hooks, the scrap standards are: (1) There are cracks or breaks on the hook surface. If cracks and breaks are found, they should be replaced immediately, and repair welding is not allowed. . (2) When the height of the working section of the hook (at the lanyard) reaches 10% of the original height, it should be scrapped. (3) When the hook mouth, hook neck and dangerous section of the hook are permanently deformed, they shall be scrapped; the hook mouth shall be scrapped if the opening degree exceeds 15% of the original size. (4) When there are knife marks or cracks in the transition section of the hook tail and the thread, it shall be scrapped. What is the scrap standard for pulleys? Answer: The scrap standard of the pulley is 1) The wall thickness of the pulley groove is 20% of the original thickness; 2) The radial wear of the bottom of the pulley groove exceeds 50% of the wire rope diameter or the uneven wear exceeds 3mm; 3) Cast iron The pulley is found to have serious cracks; 4) What is the scrapping standard of the brake wheel for serious damage to the pulley rim? Answer: When the depth of claw marks or radial wear on the working surface of the brake wheel reaches 1.5mm, it should be re-machined and heat-treated. When the wear of the brake wheel of the lifting mechanism exceeds 40% of the original thickness, it shall be scrapped; when the wear of the brake wheel of the operating mechanism exceeds 60% of the original thickness, it shall be scrapped. What is included in the overhaul of the bridge crane? Answer: The overhaul includes: mechanical parts: all mechanisms are disassembled, including the reducer, coupling, reel set, wheel set and fetching device, etc., replacement parts that should be scrapped, reassembled after cleaning, and lubricated. Replace the wire rope and brake. Electrical part: the motor should be disassembled, dried, assembled and lubricated. Replace the damaged motor, replace the brake opening device, replace the damaged controller, repair or replace the protection cabinet, replace the wiring of all circuits, re-wiring and install, and replace the control board of the lighting signal system. Metal structure part: correct and strengthen the main beam with downward deflection and side deflection, clean the whole crane and repaint it with anti-rust paint twice. Crane main girder scrap standard: The crane has been overhauled many times, and the main girder is severely depressed or cracked after being repaired twice, which marks the end of the safe service life. After being appraised by the competent authority and the safety technology department, you can apply for scrapping and updating the whole vehicle. Deflection and cracks in the main girder of a well-designed and manufactured bridge crane are fatigue damage, which is a linear cumulative damage that is gradually formed by the partial cyclic slip and yield of the material structure under the action of alternating stress. Therefore, repeated severe deflection or multiple cracks indicate the end of the safe service life of the main beam. In general, the safe service life of heavy clamp construction hoists, grab construction hoists, electromagnetic cranes, etc. is about 20 years; loading construction hoists, rake cranes, etc. are about 25 years; forging cranes and casting cranes are more than 30 years old, and general-purpose bridges Type cranes are 40-50 years old. The actual service life depends on the specific operating conditions, and may be longer or shorter. There are many scrapping standards for crane parts. Due to space issues, we will update the scrapping standards for the remaining parts in the next article. The boss who needs to buy crane parts can contact our crane manufacturer, who can provide all kinds of crane parts.
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