used in Construction vertical transportation as an integral part of construction machinery
, the use is of very high frequency. Here we show you some terminology usually use daily:
1, Rated installed load is different from the rated load, it means maximum load allowed in the construction elevator installation conditions. Conditions in the construction elevator installation structure is incomplete, its force performance is weak , and therefore must be strictly controlled during the bear cage load .
2 , the limit switch : When the cage up or run down to the end of travel , subject to the upper limit or lower limit to trigger, automatic cut-off control circuit, the cage run aborted. At this point hoists can not continue to run along the original direction, but can run in the opposite direction . Limit switches are an important safety device to prevent cage hoisting .
3 , the peak limit switch: When the cage beyond the stroke end , it will automatically cut off the power supply, so that the cage run terminated. At this point construction hoist
can not continue to run due to power off, it required to hand power to resume operation. Peak limit switches are an important safety device to prevent cage hoisting .
4, the drop test is to simulate the construction of the lift cage due to accident occurred and a failure of the process of falling, by the construction of the lift cage at a certain load along the frame rails for free fall, check whether fall protection safety device test system can effectively stop hoists . Under the current national standard " construction elevator " GB/T10054-2005 the provisions : safety device installed in use, the cage should be do load drop test at rated capacity. After at least every three months should do a drop test of the rated load .