The multi-way tube joint were manufactured with advanced hydraulic extrusion-bulging forming replacing backward working methods.
采用先进的液压挤胀成形代替落后的加工方法生产多通管接头。
In order to solve problems of gas outburst, gas accumulation and dust pollution during the process of developing coal roadway, hydraulic extrusion technology suitable to coal seam condition in Qidong mine was studied.
为解决掘进煤巷瓦斯突出、积聚和粉尘污染等问题,结合祁东煤矿的煤层开采条件,研究水力压挤技术,探讨水力压挤防治瓦斯煤尘机理,试验确定钻孔布置、封孔深度、注水压力、注水量与注水时间等工艺参数。