With the continuous improvement of the port and the continuous progress of the port machinery. the port crane plays a key role in the whole hoisting. In order to ensure the safety. it usually carries out non-destructive testing. Through timely troubleshooting. it can know where there is a fault. so it can quickly carry out repair and rescue. and avoid accidents.

The main girder of port machinery is subjected to numerous repeated alternating loads. pressures and other loads in the long-term use process. which makes the metal fatigue damage lead to various defects. At the same time. affected by oxidation. corrosion. environment and other factors. it will reduce its use safety. It is an important measure and means to detect and evaluate the active defects of the main girder to avoid safety accidents.

The weld inspection of port machinery can be divided into offline inspection and online inspection. Off line inspection refers to the quality inspection of the welding seam of the crane before leaving the factory or in the non working state after the component is welded. Off line detection is the necessary guarantee of product quality. On line inspection refers to the quality inspection and monitoring of the welding seam when the crane is in service. which is the necessary guarantee of safety production.

Magnetic particle testing is generally used for surface crack detection of hook head on port machinery. In addition to the undercut and neck root of the hook thread. the bending part of the hook (i.e. the dangerous section) should also be the focus of fatigue crack inspection. The crack can be found by the method of coil and yoke. The defects perpendicular to the axis of the coil can be found by the coil method. The neck and thread of the hook can be detected by the coil method.

There are also nondestructive testing of other parts of port machinery. Ultrasonic inspection can be used to inspect the traveling shaft. pulley shaft. drum shaft and other important bearing shafts of gantry crane. Because of the strong penetrability of ultrasonic testing and the sensitivity to the crack at the variable cross-section. it is convenient to use in the detection of shaft.