采煤机液压自动调高系统的研究

提出了一种新的滚筒采煤机摇臂高度的自动调整方法。其原理是用采煤机滚筒在截割纯煤层和顶板岩石时的切割力作用于调高油缸而引起的压力变化不识别煤，岩分界，并据此控制相应的液压伺服系统以达到自动调整采煤机滚筒高度的目的。

Study on Hydraulic Automatic Ranging Cutting Height of Shearer

A new method has been put forward to automatically adjust height of drum-typeshearer.The principle of this rnethod is that the boundary of coal and rock is recognized with thepressure changes resulting from the height adjustment of the oil cylinder exerted by the cutting forceswhile the shearer drum is cutting the pure coal seam and the rock.With the help of this the corre-spondent hydraulic serving system can be controlled to adjust the height of shearer drum automati-cally.In this paper, a mathematical model is established a nd experiments and researches have been al-so carried out.