Gantry crane overload

Gantry crane rope will trace increasing load elongation, when the load exceeds the elastic limit,steel crane the rope may break. Usually withstand a static load of the control rope breaking load at 1/10 to 1/5, known safe load. Safe load represents the rope allows withstand static load. But too often the rope is in motion, the working rope in addition to bear the goods, hanging objects, weight and other static load, but also due to acceleration and impact caused by the dynamic load caused by the additional load due to the bending, caused by friction load resistance and so on. Thus,hoist gantry crane when the static load in addition to other than the load increases, the actual safety factor is reduced, the wire tends to overload caused thereby.

Breakage due to overload the wire rope,overhead bridge crane the fracture was loosely shaped, 6 strands rope fracture position most are not together, rope core exposed, which is wire breakage due to overload characteristics. Even without overload rope rupture accident, will greatly shorten the service life. Figure 7 is obtained from the test life rope safety factor and the relation curve, seen from the figure will cause the wire rope safety factor reduces life dramatically.