are you using original coupling?
Ball screw issue can result coupling broken. Example from my experiences, customer spray paint on machine but never cover the ball screw result coupling broken even they clean it up.
您使用的是原厂配件?
滚珠丝杆可能会导致联轴器损坏。例子, 从我的经验,客户机上喷漆,但没有盖滚珠丝杠,,他们清理后,但它仍然致联轴器损坏,因为涂料仍然在滚珠螺母.