目前,某些林业局贮木场和各种仓库、装卸场地都应用了起重机进行装卸物料,而取物装置都是采用吊钧装置。随着国民经济的发展,要求采用抓具(或抓斗)完成自动抓取物料的用户越来越多。现有的吊钩起重机改成抓具起重机,只能应用马达抓具(或抓斗),这就要采用电缆向马达抓具(或抓斗)供电,而抓具的升降就需要电缆的升降,所以,必须 At present, some forestry bureaus and all kinds of warehouses, loading and unloading sites are using cranes for loading and unloading materials, and pick-up devices are used Jun device. With the development of the national economy, more and more users are required to complete the automatic grasping of materials by using the grasping tools (or grapples). The existing hook crane into a gripper crane, can only use the motor gripper (or grab), which will use the cable to the motor gripper (or grab) power supply, and the lifting of the grip on the cable needs to lift So, must