摘要
双套钢丝绳卷绕系统在单一故障保护起重机起升机构中广泛采用，在发生某一套钢丝绳断裂的事故下，未断的钢丝绳仍然能平衡地承载载荷。在忽略主梁弹性和考虑主梁弹性2种情况下，研究了钢丝绳卷绕系统的动力学特性。发现两种模型的计算结果接近，工程计算中可以采取忽略主梁弹性的简化模型。在单套钢丝绳断裂事故发生后，未断钢丝绳上的最大拉力为事故前的3倍，这一倍率关系是恒定的，与被吊物品重量及钢丝绳的型号无关。单根钢丝绳断裂事故下钢丝绳拉力在起升制动器反应之前即已达到最大值，钢丝绳拉力极值将作用于起升机构传动链上。根据ASMEN0G-1的要求，为具备承载单根钢丝绳断裂事故的能力，在正常工况下钢丝绳应具备7.5倍的安全系数，这相当于GB/T3811对M7~M8级起升机构的要求。
The double-wire rope reeving system is widely applied in single failure proof crane hoist units. In case of single wire rope break accident, the intact wire rope can sustain the load and keep the balance. Two dynamic models were studied : one ignored the elasticity ol bridge girders while another considered it. It was found that the responses of the two dynamic models were quite similar, and it would be acceptable to ignore the elasticity of bridge girder in engineering calculations. The maximal force in the intact wire rope is 3 times of the force before accident.This ratio is constant, regardless of the load and wire rope type. The load in the intact wire rope may reach the maximum value before the hoist brake takes action in single wire rope broken accident, the impact load in the wire rope will apply on the whole hoist unit. The wire rope should reach 7.5 times of the safety factor in normal operating condition in order to sustain the impact load in single wire rope broken accident according to ASME N0 G- 1 , which is equivalent to the requirements of GB/T 3811 for M7～M8 class hoists.
作者
翁晨阳
WENG Chenyang(Shanghai Nuclear Engineering Research and Design Institute, Shanghai 200233, China)
出处
《应用科技》
CAS
2016年第4期16-20,共5页
Applied Science and Technology
基金
国家重大科技专项基金项目(2011ZX06002-002)
