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取消牵引链所取得的可观效果,早已引起从事机械化问题研究的科研和设计单位对采煤机主要结构的注意。在结构上无链牵引有:环形无极链、千斤顶、齿条等。按牵引原理可以分成四种,其中环形无极链和齿条型式得到了飞速发展,而其他二种没有得到推广。千斤顶仅在法国的个别矿采用,而摩擦牵引仍处于设计和试验阶段。PACKTRACK型(图1)和PERATRAK型是安装在运输机上的环形无极链与肖轨协同
The considerable effect of the removal of the traction chain has long drawn the attention of the research and design institutes engaged in mechanized research on the main structure of the shearer. No chain traction in the structure are: ring Promise chain, jack, rack and so on. According to the traction principle can be divided into four types, of which the endless chain and rack type has been rapid development, while the other two have not been promoted. Jacks are used only in individual mines in France, while friction traction is still in the design and test phase. The PACKTRACK type (Figure 1) and the PERATRAK type are ring-shaped electrodeless chains mounted on a conveyor in cooperation with the Shaw Rail