起重作业安全培训课件.ppt

* 绳索不得打结 使用卸扣 * 需要卸扣 * * 严禁歪拉斜吊！ 不要快速回转，防止载荷偏离 载荷偏离的角度会在回转时增大，并会产生冲击载荷及转矩作用在起重臂上。 快速回转会使作业半径增大 注意升降速度， 防止冲击载荷！ 快速起升会产生冲击载荷 快速松钩会产生起重臂向后倾翻 甚至起重臂弯折 突然在起重机施加载荷也会产生冲击载荷 * 谢谢！ * Fiber cores are ropes made from fibers formed into yarns, then into strands and finally into the finished core form. There are two general types of fiber: natural vegetable material, such as sisal, manila and cotton and synthetic filaments, such as polypropylene or polyethylene. Steel cores may be an independent wire rope (IWRC) or, in the case of small diameter ropes and some rotation-resistant ropes, a wire strand core (WSC). These steel cores provide more support than fiber cores to the outer strands during the rope’s operating life. Steel cores resist crushing, are more resistant to heat, reduce the amount of stretch, and increase the strength of the rope. * Fiber cores are ropes made from fibers formed into yarns, then into strands and finally into the finished core form. There are two general types of fiber: natural vegetable material, such as sisal, manila and cotton and synthetic filaments, such as polypropylene or polyethylene. Steel cores may be an independent wire rope (IWRC) or, in the case of small diameter ropes and some rotation-resistant ropes, a wire strand core (WSC). These steel cores provide more support than fiber cores to the outer strands during the rope’s operating life. Steel cores resist crushing, are more resistant to heat, reduce the amount of stretch, and increase the strength of the rope. * In regular lay ropes, the wires in the strands are laid in one direction, while the strands in the rope are laid in the opposite direction. The result is that the wire crown runs approximately parallel to the longitudinal axis of the rope. These ropes have good resistance to kinking and twisting and are easy to handle. They are also able to withstand considerable crushing and distortion due to the short le