Posted by ZZHZ on April 03,2019

All cranes need to comply with the design standard of GB3811 Lifting machinery design code. Because lifting machinery is mainly used for material handling, the force of product structure becomes an important index to measure the product quality. Generally, static load design is based on 1.25 times the rated load, and 1.1 times the dynamic load. So the purchase unit only needs to give the rated lifting weight. Some parts, such as wire ropes, can be pulled off at 6 times the rated load. It is the high requirements that ensure that the lifting machinery does not collapse and the rope does not break. When the steel structure is manufactured and welded, different welding procedures should be selected according to different materials. After welding, ultrasonic inspection, radiographic inspection and magnetic particle inspection should also be carried out according to the type of workpiece, so as to ensure that the welded workpiece does not have any welding defects. Of course, small or unregulated enterprises may not be able to do the necessary flaw detection, but it will bring security risks to the product. As a lifting machine, it involves a lot of component product standard. Users should pay attention to the product standards of this kind of products, such as the general technical specification of bridge erecting machines, and the safety regulations of bridge erecting machines, as well as the product standards of the parts involved in lifting machinery, such as <The General Technical Specification of Bridge Erecting Machines>, <The Safety Regulations of Bridge Erecting Machines>, and <Standard General Gantry Crane> for bridge erecting machines.