In machine with electromotion control, the system can work only if the bow is at horizontal position.
在电动配置的机器中，绞弓必须处于水平位置，线盘上落机构才能工作。
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At last, the article made use of DYNAFORM software to simulate the horizontal beam and the roof bow, and in the actual production carried on a verification to the spring-back of the roof bow.