Upper section composed of driving sprocket upper casing with rails (double chain) and discharging outlet.
上部区段，由传动链轮及带有轨道(双排链)的上部机壳、卸料口组成。
Upper device — includes parts of upper casing, top cover, discharge outlet (with anti back feed plate), head shaft and backstop.
上部装置——有上部机壳、上罩、卸料口(装有防回料板)、头轴装配、逆止器等部件。
Applying pump pressure then activates a sliding collar that opens access ports, enabling circulation across the upper casing interval.
然后施加泵压，使滑动箍启动，于是使进入口开启，从而能够穿过套管上段进行循环。
Upper casing, as a key part in the driving system of helicopter, is difficult to be formed owing to its complex geometry and high demand for property.
上机匣为直升机传动系统中的关键零件，几何形状复杂，性能指标要求高，成形难度大。
Upper casing, as a key part in the driving system of helicopter, is difficult to be formed owing to its complex geometry and high demand for property.
上机匣为直升机传动系统中的关键零件，几何形状复杂，性能指标要求高，成形难度大。
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