Take care of the original pully belt ageiging, if so please change a new belt and check the belttightener !
安装时请检查原厂皮带老化情况，有问题请及时更换以后在使用，请检查皮带松紧力是否合适。
2
When a collision occurs, the shoulder belttightener compensates for "belt slack" and "film-reel effect" by retracting and tightening the belt strap.
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。
3
Calculation formula of the tension caused by an automatic swaying belttightener is derived theoretically according to the force balance of stable operation of belt driving.