液压推进机的作用是推进空模具或浇筑后的模具，采用根据负载和频率分析的强度和疲劳设计，选用特
殊材质的液压缸缸筒材料，以及专门的焊接技术，通过超声波探伤检测。
The role of the hydraulic propulsion machine is to promote the empty mold or pouring after the mold,
according to the load and frequency analysis of the strength and fatigue design, select special material of the
hydraulic cylinder material, as well as special welding technology, through ultrasonic inspection.
