发成碰撞时，通过牵引和张紧安全带圈带，肩带张紧装置补偿安全带松动和胶片卷轴效应。
When a collision occurs, the shoulder belt tightener compensates for "belt slack" and "film-reel effect" by retracting and tightening the belt strap.
牵引变压器是牵引变电站中最重要的电气设备，牵引变压器保护装置是整个牵引供电系统安全稳定运行的基础。
Traction transformer is the most important electrical equipment of traction substation. Also traction transformer protection device is the foundation of safe and stable traction power supply system.
引进国外先进技术并国产化了的重量限制器、力矩限制器、高度限位器、幅度限位器、回转限位器、回转、牵引机构的制动器等安全装置。
Weight limier, height limiter, radius limiter, slewing limiter, slewing brake, traction brake and similar safety guards are China-made based on the brought in technology;
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