我厂开始新制机车车辆上的压缩圆簧时,卷簧芯子耗费很大,寿命在1000卷以下,经几次改进,最后采用如图所示的水内冷芯子结构。冷却水在联接头Ⅰ处进入,经3″管流入芯子内,再经芯子内孔返回Ⅱ处流出。 When the factory starts to compress the round spring on the new locomotive, the coil spring core consumes a lot, the service life is under 1000 rolls, and after several improvements, the water internal cooling core structure as shown in the figure is adopted finally. The cooling water enters into the joint I and flows into the core through the 3 "pipe, then flows out through the inner hole of the core to return to II.