公开(公告)号：US5402688A

公开(公告)日：1995-04-04

申请号：US032650

申请日：1993-03-17

申请人： Yoshitora Okada ,  Shouji Yakugawa ,  Michihiko Iwamoto

发明人： Yoshitora Okada ,  Shouji Yakugawa ,  Michihiko Iwamoto

IPC分类号： B25B23/14 ,  E21B19/16 ,  G01L5/24

CPC分类号： E21B19/166 ,  B25B23/14

摘要： During the period from the start until the completion of tightening of a pipe joint, the tightening torque applied to the pipe joint and the number of turns are sampled at prescribed intervals and stored. After the completion of tightening, a differential calculation is performed with respect to the stored data to determine the rate of change of the tightening torque with respect to the number of turns. Next, a reference value and the previously determined differentials are compared in the reverse order from storing, i.e., going backwards from the value corresponding to the completion of tightening. Based on this comparison, the stored data corresponding to the differential value which first falls below the reference value are made the tightening torque and the number of turns at the transition point, and the tightened condition is assessed based on whether the tightening torque and/or the number of turns at the transition point are in prescribed ranges.

摘要翻译： 在从开始到完成管接头的紧固期间，施加到管接头的紧固扭矩和匝数以规定的间隔被采样并存储。 在完成紧固之后，相对于存储的数据进行差分计算，以确定紧固扭矩相对于匝数的变化率。 接下来，将参考值和先前确定的差值以与从紧固完成相对应的值的存储逆向顺序进行比较。 基于该比较，将与首先低于基准值的差分值相对应的存储数据作为紧固扭矩和转换点处的匝数，并且基于紧固扭矩和/或 转换点的匝数在规定范围内。