Ensure gear meshing


Nippon Steel has clearly defined the special requirements for testing: each of the four lifting elements must be able to lift a 180t load when the system is installed in a future position, with a stroke of 1900mm in each direction to meet the required test parameters. The equipment company designed and built a device that can withstand 2000kN and provide enough space for the 1900mm stroke. A series of tests were carried out for each lifting element, with test conditions ranging from zero to maximum stroke with loads between 600 and 1800 kN. The lifting load is increased from 60t to 180t step by step. This is a necessary step for commissioning the lifting element, ensuring an ideal contact point on the gear meshing and the load-bearing threads of the worm gear.
For each test series, the motor power consumption was continuously measured during the travel of the stroke. Comparing the power consumption of each stroke movement with the nominal current consumption determined by the motor theory is one of the parameters that can intuitively understand the conditions of the lifting element. If the power consumption over a few trips is much higher than the nominal current draw determined by the motor theory, this may indicate a problem with manufacturing, assembly or installation. In addition, after the stroke movement is completed, the temperature of the jack spiral and the worm and the different measuring points in the gearbox are measured and recorded. Protection of silicon components The output power of the silicon rectifying device is small, and the selected silicon components have high withstand voltage capability, and no overvoltage protection is required. Only the DC output terminals are connected in series with a reasonable current limiting resistor to cooperate with the current relay to protect the silicon. Components so that they are not damaged by overcurrent. For silicon rectifiers with large output power, a protection circuit must be configured.

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