Crane Main Beam Scrapping Standard

Crane refers to a multi-action hoisting machine that vertically lifts and horizontally transports heavy objects within a certain range. Also called a crane. It belongs to material handling machinery.

The working characteristic of the crane is to do intermittent motion, that is, the corresponding mechanisms of the actions of taking material, moving, and unloading in a working cycle are alternately working. The development and use of cranes in the market are becoming more and more extensive.

For such a machine that handles heavy objects, such compound motion will naturally cause a lot of wear and tear to its components. Therefore, we need to understand the scrapping standards of each component in detail, and replace the accessories in time, so as to make the crane safer. Efficient work.

After the crane has been overhauled for many times, the main beam is severely bent or cracked many times after the main beam is repaired twice, which marks the end of the safe service life. After being appraised by the competent department and the safety technology department, the vehicle can be scrapped and updated. The downward deflection and cracks of the main beam of the bridge crane that are qualified for design and manufacture belong to fatigue damage, which is the linear cumulative damage gradually formed by the local cyclic slip and yield of the material structure under the action of alternating stress. Therefore, repeated severe bending or repeated cracks marks the end of the safe service life of the main beam.

In general, the safe service life of the heaviest clamp cranes, grab cranes, electromagnetic cranes, etc. is about 20 years; loading cranes, rake cranes, etc. are about 25 years; forging cranes, casting cranes are more than 30 years, general Overhead cranes are 40-50 years old. The actual service life depends on the specific operating conditions and may be longer or shorter.