工业企业大量使用的自制载货升降机,是一种构造简单、井道式安装、厢外操作的垂直运输设备。在使用中,常因缺乏楼层门、轿厢门可靠的联动安全闭锁装置,轿厢停靠梯层难以做到自动准确平层,造成人身伤亡事故。但是,由于这种设备结构简单.制造方便,成本较低,在我国各地应用相当普 The self-made cargo lifts used extensively by industrial enterprises are vertical transport equipment of simple structure, hoistway installation and operation outside the cabin. In use, often due to the lack of floor doors, car door reliable linkage safety locking device, the car stops the ladder is difficult to automatically and accurately leveling, resulting in personal injury. However, due to the simple structure of the device, easy manufacture and low cost, the application in our country is quite general