Schwab Charles V, Rempe Isaac J
Iowa State University.
J Agric Saf Health. 2017 Nov 20;23(4):281-295. doi: 10.13031/jash.12562.
Power take-off (PTO) is a common method of transferring power from a tractor to a towed piece of machinery. The PTO is also a well-documented cause of severe and often permanent disabling injuries to farm operators. The physical conditions that cause entanglements are not well established. Several studies have explored the parameters of PTO entanglements as materials have been drawn across a rotating PTO knuckle to test for entanglement probability. The objective of this study was to determine probability of entanglement when materials are dropped vertically onto a PTO knuckle spinning at 540 rpm. A total of 360 randomized trials were conducted with ten replications for each of the six positions (center of yoke, edge of yoke rotating downward, edge of yoke rotating upward, center of cross, edge of cross rotating downward, and edge of cross rotating upward) and six different materials (woven cotton athletic shoe lace, cotton workboot lace, leather workboot lace, cotton twine, denim strip, and Tyvek strip). Not a single entanglement was recorded. Dramatic high-speed video imagery authenticated the material's motion and path as it interacted with the rotating PTO knuckle.
动力输出（PTO）是一种将拖拉机动力传输到被牵引机械设备的常见方式。动力输出也是导致农场操作人员遭受严重且往往永久性致残伤害的一个有充分记录的原因。导致卷入事故的物理条件尚未完全明确。已有多项研究探讨了动力输出卷入事故的参数，即当材料被拉过旋转的动力输出关节以测试卷入概率时的情况。本研究的目的是确定当材料垂直落到以540转/分钟旋转的动力输出关节上时的卷入概率。总共进行了360次随机试验，针对六个位置（轭架中心、向下旋转的轭架边缘、向上旋转的轭架边缘、十字中心、向下旋转的十字边缘和向上旋转的十字边缘）和六种不同材料（编织棉质运动鞋鞋带、棉质工作靴鞋带、皮革工作靴鞋带、棉线、牛仔布条和特卫强条带）各重复十次。未记录到一次卷入事故。高速视频图像证实了材料与旋转的动力输出关节相互作用时的运动和路径。
