一种可开启吊钩装置铁道部武汉工程机械厂邹建华在测桩，石材破碎、砸铁等作业中，经常需要将锤体提升到一定高度，然后让其自由落下去撞击作业对象。这样，就要求提升锤体的吊钩在预定的位置能够开启，使锤体离开吊钧并产生自由落体运动。这类吊钩有很多形式。但大都存在... An openable hook device, Zou Jianhua, Wuhan Engineering Machinery Plant of the Ministry of Railways In the process of measuring piles, stone crushing, and thorium iron, it is often necessary to lift the hammer body to a certain height, and then allow it to fall freely and strike the operating object. In this way, it is required that the lifting hook of the hammer body can be opened at a predetermined position so that the hammer body can move away from the pole and generate a free-fall motion. There are many forms of this type of hook. But most of them exist...