Nowadays, under the economic development trend, the machinery and equipment industry is accompanied by the crane industry. They are widely used for lifting some heavy objects, and construction hoist
s are used in many scenarios, such as high-speed construction, urban road construction, railway construction, It will be used in construction, but in the process of general crane use, due to the inevitable wear and tear of mechanical parts, components, electrical control and hydraulic system components, and after wear, it will cause failure. However, the cause of the fault may not be single, so it is necessary to analyze the cause of the fault, accurately find out the true cause of the fault, and take corresponding methods to eliminate the fault to restore the technical performance. So how to troubleshoot and solve the crane fault? Let's take a look at the lifting together! Crane failure and troubleshooting (parts) 1. Forged hook failure and damage status 1. Fatigue cracks on the hook surface; 2. Wear of openings and dangerous sections; 3. Plastic deformation of openings and bending parts; causes and consequences: 1. Overload, overdue use, material defects; 2. In severe cases, weakened strength, easy to break the hook, causing accidents; 3. Long-term overload, caused by fatigue; troubleshooting methods: 1. Find cracks, replace; 2. Wear exceeding the dangerous section 10%, replace; 3. Replace immediately. 2. Failure and damage of laminated hook (plate hook) 1. Deformation of the hook; 2. Fatigue cracks on the surface; 3. Wear of the pin shaft exceeds 3% to 5% of the nominal diameter; 4. The earring is caused by cracks or Burr; 5. Wear of earring bushing reaches 50.% of the original thickness. Reasons and consequences: 1. Long-term overload, easy to break the hook; 2. Overdue, overload, and hook damage; 3. The hook falls off. 4. The earrings are broken; 5. The stress is not good. Remedy: 1. Replace it with a new one; 2. Replace it. Three, wire rope failure and damage 1. Broken wire, broken strands, knots, wear; 1. Causes and consequences: cause sudden rope break. 2. Elimination method: stop using broken strands and knots, broken wire, replace according to standard, wear, replace according to standard. 4. Pulley failure and damage status 1. Pulley rope groove is unevenly worn; 2. Pulley mandrel wear reaches 3% to 5% of the nominal diameter; 3. Pulley does not rotate. 4. The pulley is inclined or loose; 5. The pulley is cracked or the rim is broken. Reasons and consequences: 1. Uneven material, substandard installation, poor contact between rope and wheel; 2. Damage to the spindle. 3. The abrasion of the spindle and the wire rope is increased; 4. The positioning parts on the shaft are loose, or the wire rope skips grooves. 5. The pulley is damaged. Remedy: 1. The wear of the wheel groove wall reaches 1/10 of the original thickness, and the radial wear reaches 1/4 of the rope diameter should be replaced; 2. Replace; 3. Clean up, repair, and strengthen lubrication; 4. Shaft The upper positioning piece is loose, or the steel wire rope skips the slot for maintenance. 5. Reel failure and damage status 1. Reel fatigue cracks; 2. Reel shaft and key wear; 3. Reel rope skipping wear and rope skipping, and the amount of wear reaches 15% to 20% of the original wall thickness. Reasons and consequences: 1. The reel is broken; 2. The shaft is sheared, causing the heavy object to fall; 3. The strength of the reel is weakened and it is easy to break; the wire rope is entangled chaotically. Remedy: 1. Replace the reel; 2. Stop using it, and repair the shaft key immediately; 3. Replace the reel. 6. Gear faults and damage conditions 1. Gear teeth are broken; 2. Gear wear reaches 15% to 25% of the original tooth thickness; 3. Gear cracks; 4. Gear keyway is damaged due to 'key rolling'; 5. Tooth surface peeling off The surface occupies 30% of the total working area, and the spalling depth reaches 10% of the tooth thickness; the carburized layer of the carburized gear wears 80% of the depth. Reasons and consequences: 1. Shock and vibration occurred during work, and continued use to damage the transmission mechanism; 2. Vibration and abnormal noise during operation were caused by overdue use and incorrect installation; 3. Gear damage; 4. Falling of the crane ; 5. Overdue use, heat treatment quality problems. Remedy: 1. Replace the new gear; 2. Replace the new gear; 3. Replace the lifting mechanism, repair the operating mechanism, etc.; 4. Replace the lifting mechanism, and repair the keyway of the operating mechanism. ; 5. Replace. The high-speed gears of the reducer with a peripheral speed> 8m/s should be replaced in pairs when worn.
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