The instruction of Sequence Control Relay (SCR) is used as the primary design method to achieve feeding, locating testing and fixing gas lock valve intermitently and in sequence.

• 以顺序控制继电器指令（SCR指令）作为实现控制的主要设计方法，实现了闭气塞的输送、定位、检测、抓取等环节按一定时序有节拍的控制。