Specialized hydraulic equipments and so on production, hydraulic ram, screw swinging cylinder, drill jumbo.

专业生产、液压油缸、螺旋摆动油缸、凿岩台车等液压设备。

At first, it studied the plant model of position and force system about valve control unsymmetrical hydraulic ram.

首先，建立了阀控非对称缸位置控制系统与力控制系统的数学模型。

Others from V or X shapes. Some canopies are a single piece and some are two pieces with a hydraulic ram at the hinge-joint.

另从V或X形。一些檐篷是一个单一的作品，有些是两件与液压内存在铰链联合。

Alternatively the ejector rod may be coupled directly to the hydraulic ram so that forward and rearward movement of the ejection System may be achieved.

另一种顶棒可以直接和液压缸活塞偶合所以可以实现顶料系统的向前和向后运动。

In this article, the author introduces the lateral movement equipment in construction of railroad bridge , which adopts hydraulic ram to transfer the beam at the top of pile.

介绍了一套铁路桥梁施工中，采用液压油缸使梁体在墩顶横向平移的设备，详细叙述了该设备的系统组成、原理、设计构想、施工工艺及在实际施工中的安全注意事项等。