What’re the test and accept of electric hoist of gantry crane?
1. test with no load of gantry crane
1.1 press relevant button and check whether the movement of all mechanism complies with marked sign on the button. If tight, try again for two cycles continuously.
1.2 raising or lowing the hook to the limited positions and check whether the position limiter is reliable or not
1.3 click the button and confirm the running distance of the motor axis which should be in the range of 1-2mm
It is not until there isn’t abnormal phenomenon to happen in the no-load test that the loading test can be conducted. The latter is carried out in two forms of static test and dynamic test. To check whether there is unusual phenomenon or not.
2. static test of gantry crane
with rated voltage, adding load gradually to 1.25 times the rated load, lifting to position 100-200mm from the ground and stay for no less than 10 min. unload and check with eyes whether there are abnormal phenomena like crackles or permanent distortion to all parts. if not, to be qualified.
3 dynamic tests of gantry crane
With rated voltage, carry out dynamic test with 1.1 times the rated load, the total test cycle is 30s; that is 6s to rise, 9s to stop, 6s to fall, another 9s to stop. The test should last for 15 cycles. Then see whether there are abnormal phenomena on every part. If not any, confirm to be qualified.
4. The braking motor should be adjusted to such an extent as the heavy objects can stop in the air. When stop during the course of falling with rated load, the sliding distance S≤Vup/100mm (Vup short for lifting) speed with rated load
