The hammer core is lifted to a certain height by an oil cylinder or other lifting device then falling freely.
其锤芯由提升油缸或其他提升装置提升到一定高度，然后自由落下。
Continue to rise to the height of 3, the first lifting weights, need to try hanging, namely first slow will lift a weight, to rise to a certain height to determine no problem.
第一次进行吊重物时，需要先进行试吊，即先缓慢的将重物吊起，升到一定高度确定没问题以后，在继续提升到所需要的高度。
If a heavy body is to be lifted to a certain height, work must be done, or energy expended, equal to the weight of the body multiplied by the height through which it is raised.
如果把重物举到一定高度，一定要做功或者消耗能；而这个功或能就等于物体重量乘以物体举起的高度。
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