Patent WO-2012017295-A1 (WO)
Title: System and method for the quality control of screwed-in joints
Inventor: CATTANEO MASSIMILIANO
IPC: G01L5/24
Filed: 2011-08-02
Abstract: The present invention refers to a system for the quality control of screwed-in joints, comprising: a dynamometric wrench comprising a lever body provided, at one end, with a handle and, at the opposite end, with a coupling head with the threaded tightening element of a joint to control, sensor means of the torque applied to the threaded tightening element which are associated with the lever body and which are suitable for supplying an output signal corresponding to the torque applied to the threaded tightening element by the lever body and sensor means of the rotation angle of the lever body which are associated with the lever body and which are suitable for supplying an output signal corresponding to the rotation angle of the lever body in applying the torque, first interface means with a user which are associated with the lever body and a processing unit which is in communication with the sensor means of the torque and the sensor means of the rotation angle of the lever body, from which it receives in input the respective output signals, and with the first interface means, wherein the processing unit is capable of detecting, among the pairs of values consisting of torque and corresponding rotation angle of the lever body acquired by the respective sensor means, the pair of values corresponding to the The present invention refers to a system for the quality control of screwed-in joints, comprising: - a dynamometric wrench comprising a lever body provided, at one end, with a handle and, at the opposite end, with a coupling head with the threaded tightening element of a joint to control, sensor means of the torque applied to the threaded tightening element which are associated with the lever body and which are suitable for supplying an output signal corresponding to the torque applied to the threaded tightening element by the lever body and sensor means of the rotation angle of the lever body which are associated with the lever body and which are suitable for supplying an output signal corresponding to the rotation angle of the lever body in applying the torque, - first interface means with a user which are associated with the lever body and - a processing unit which is in communication with the sensor means of the torque and the sensor means of the rotation angle of the lever body, from which it receives in input the respective output signals, and with the first interface means, wherein the processing unit is capable of detecting, among the pairs of values consisting of torque and corresponding rotation angle of the lever body acquired by the respective sensor means, the pair of values corresponding to the moment when the threaded tightening element begins to move and discriminating, among the pairs of values subsequent to and comprising the pair of values of the start of the movement so detected and comprised in a predefinable variability range of the rotation angle of the lever body, the pair of values consisting of the residual torque and the corresponding rotation angle of the lever body, and wherein the first interface means comprise signalling means to a user of the detection of the pair of values consisting of the residual torque and the corresponding rotation angle of said lever body which can be actuated by said processing unit.