Load test of cranes means a trial lifting objects before the crane leaves the factory. A load test could check whether the crane mechanisms work well or not, which ensure smooth and safe working of workers to a great extent.

Load test content:

1. Dynamic load test

The test uses 1.1 times rated load, main girder does not down deflection, all mechanisms work well, performance parameters meet the design demand, all limit switches and safety protection interlock devices are reliable, all spare parts does not have cracking and flexible connection, all motors and contactors are not overheat.

2。 Static load test

The test adopts 1.25times rated load, all mechanisms work well, the crane stops 20-30min as trial load is lifted 10cm high, then measure main girder down deflection(theodolite, ruler). Put down trial load to measure main girder upper camber, repeat 3 times, steel structure does not have permanent deformation(mid-span vertical static deflection is S/700).