Energy isolation in maintenance operations
In the maintenance of various kinds of equipment, because there may be accidental release of electrical energy, pressure energy, mechanical energy, potential energy and other energy, the need to adopt a reliable way to isolate these energies. Otherwise, in the process of operation, the accidental release of these energies may cause injury. In this period we may cause damage due to the accidental release of these energies. In this issue we will introduce the key points of safe operation of energy isolation in maintenance operation.
Accident case 1
Zhang, a worker of sand distribution group in casting workshop of a factory, often goes to work early in the morning to repair the inner compartment of sand mixing machine, so as to ensure normal operation during working hours. Some day zhang mou comes to workshop, as usual opened door of mixed sand engine room, but without isolating power switch, also did not hang "somebody works to prohibit to close" warning sign, enter machine inside overhaul. He was afraid that the opening of the door would affect others' walking, so he deliberately took the door to leave only 150mm gap. About 7:50, after the sand worker li went to work, he saw others walking and deliberately took the cabin door to leave only 150mm gap.
Cabin door open, think others work not close strict, will be on the cabin door, the smooth start of mixing sand machine, roller rapid rotation, will work inside zhang head injury, finally due to serious injuries, rescue ineffective death.