JS型混凝土搅拌机料斗冲顶（又称冒顶）属严重安全事故。事故原因是由于电器控制系统失灵导致料斗动作失控，致使料斗不能按预定程序在卸料位置停住而继续上升，最终与上料架的顶梁相撞。此事故轻则上料架被拉歪、料斗撞坏，重则可造成人员伤亡。料斗卸料机构如附图所示。... JS-type concrete mixer hopper ceiling (also known as roof fall) is a serious safety accident. The cause of the accident was that the hopper was out of control due to the failure of the electrical control system. As a result, the hopper was unable to stop at the discharge position according to a predetermined procedure and continued to rise, eventually colliding with the top beam of the loading rack. The accident is caused by the loading rack being pulled up and the hopper being damaged, but it can cause heavy casualties. The hopper discharge mechanism is shown in the drawing. ...