随着货物列车全面重载和提速 ,车钩分离事故频频发生。造成车钩分离的原因很多 ,如低强度车钩和小容量缓冲器裂损 ;车钩、钩尾框等配件使用年限过长 ;新造产品的质量不高 ,如铸造砂眼、缩孔 ;车钩检修质量不高 ,使车钩防跳作用不良或失效等。其中 ,车钩检修质量不高是重要原因 With the full overloading of cargo trains and speeding, accidental coupler breakdowns occur frequently. There are many reasons that cause the coupler to be separated, such as the crack of the low-strength coupler and the small-capacity absorber; the service life of the coupler, the coupler and the yoke is too long; the quality of the new product is not high, such as casting the trachoma and shrinkage; , The hook anti-jump effect or failure. Among them, the poor quality of coupler repair is an important reason