Vibration testing machine and screw looseness test method

摘要

Provided is a vibration testing machine capable of loading axial rotation vibration and axial vibration in addition to right-angle vibration on a screw fastening body. For a vibration arm 2 and a weight mounting arm 3 fastened by a screw fastening body 1 in a state of being joined in parallel to each other, a connecting shaft 11 is connected to an operating shaft 5 for longitudinal vibration at the other end of the vibration arm 2. It is attached so that it can swing up and down. The weight attachment arm 3 is attached to the bearing support portion 13 so as to be able to swing vertically with the swing shaft 12 as a fulcrum. Concave portions 2a are formed in the portions where the screw fastening body 1 of the vibration arm 2 and the weight attachment arm 3 is attached. Further, the washer 20 is formed so as to have a straight portion 20b. Further, the weight attachment arm 3 attaches the weight 4 to the opposite side of the screw fastening body 1. The stroke of the working shaft 5 is set so that the vibration arm 2 is displaced relative to the weight mounting arm 3 at the lowest point along the longitudinal direction of the weight. [Selection] Figure 3