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。
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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