Ltd by breaking through traditional cold-bending forming change on OD 114 mm high frequency welded pipe units.
上海申花钢管有限公司在114高频焊管机组上突破传统冷弯变形方法，设计出强力焊管。
2
It is verified that the new hydraulic breaking hammer features simple structure, stepless adjustment of impacting power and frequency, power saving, easy maintenance, etc.
实践证明，该液压破碎锤具有结构简单，冲击能和冲击频率可无级调节，节能，维修方便等优点。
3
As it is shown in this paper the breaking state of a concrete pile can be judged by measuring its "resonant frequency spectrum".