半自动闭塞（semi-automatic block） 由人工办理行车联络手续，以出站信号机的开放显示作为行车凭证，列车出站压上专用轨道电路，出站信号机即自动关闭，在列车到达对方站以前，两站的出站信号机都不能再次开放的闭塞方法。中国的半自动闭塞设备分单线用64D型和双线用64F型两种。
半自动闭塞机 semi-automatic block machine ; semi-automatic block instrument
半自动闭塞联系电路 liaison circuit with semi-automatic blocks
继电半自动闭塞 all-relay semiautomatic block ; all-relay semi-automatic block system
半自动闭塞系统 manual cleaning separator controlled block system ; semi-automatic blocking system
单线半自动闭塞 single track semi-automatic block
对当前大量使用的继电半自动闭塞设备进行了分析，并研究了实现微机半自动闭塞的可行性。
Based on the analysis of the all relay semiautomatic block which are widely used, this paper discusses the feasibility of the semiautomatic block with microcomputer.
介绍了6 4D半自动闭塞改造为计轴自动站间闭塞的一种方案，对有关继电器及其电路进行了说明。
This paper introduced a plan to transform 64D semi-automatic section block into one with Axle Counter . And, it also illustrated relevant relays and its circuit.
在充分保留原有继电半自动闭塞制式优点的基础上，提出了两种微机半自动闭塞方案，并论述了方案中所采取的“故障—安全”措施。
With the advantages of the old system being reserved, two plans of the semiautomatic block with microcomputers are proposed and the measures for safety are introduced.
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