Common problems and causes of the three major components of crane

 The three major components of the crane are the hook, wire rope and brake. Once these three major components have problems, it is easy to cause hanging objects to fall and even cause serious casualties.
 
 
The common problem of the hook is mainly the uncoupling of the catenary rope, that is, when the object is not tied well, the angle between the catenary ropes exceeds 120 degrees, or the hook is touched laterally during lifting, the jack rope will be removed from the hook when the bottom of the heavy object is placed Drag out. In addition, because the hook is made of gray cast iron or cast steel, it is brittle, not resistant to collision, and easy to break. Therefore, during the lifting process, if the site is narrow or the operator is careful when operating, the pulley will collide And damaged. Once the pulley is damaged, the broken rim of the pulley will cause cutting of the wire rope, or even cut the wire rope and cause an accident. If the operator fails to lubricate the hook pulley in a timely manner, the pulley may cause excessive wear on the bottom of the groove due to inflexible rotation. Over time, the pulley will split in half and the hook will issue an accident during operation. Not only that, when the amount of wear on the bottom of the groove increases, it will make the wire rope embedded in the middle and deep, increasing the friction resistance, which will lead to the deepening of the wire rope embedding amount and increase the resistance, which will lead to wire scraping and accelerated scrap.
 
The common problems of wire ropes are usually caused by human factors. For example, when the operator is operating, the steel wire rope often rubs and scratches with some equipment and buildings, resulting in partial wire breakage and deformation of the outer layer of the steel wire rope; when operating the drum, the steel wire rope is wound in multiple layers on the drum; the hook is in the air The steel wire rope is twisted frequently; the steel wire rope is rusted for a long time due to lack of oil; the steel wire rope is often burnt by high temperature and the steel wire rope is burned due to the high-voltage power line, which is also the cause of the accident.
 
Common problems of brakes are: the main spring of the brake is damaged or the adjustment is too loose, and the braking torque is insufficient; the brake shoes are excessively worn to expose the cap nails, resulting in insufficient friction and the brake cannot hold heavy objects; the lock nut of the brake lever is loose, the lever Bumping, or the joints of the lever system are stuck, etc. affect the brake; the opening gap of the brake shoes is abnormal. When some brakes are opened, the gap of the brake shoes is up to 2 to 3mm on one side, and the other side is produced and the paste is attached. On the brake wheel, the wear of the brake shoe and brake wheel is accelerated, and the car cannot be braked under heavy load. In addition, the brake is too tight is also unfavorable, because when the brake opening gap is less than the normal value, the resistance of the brake wheel to rotate will increase, often smell the smell of coke skin, when the friction thermal expansion, it will stop the car have an accident.

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