The rigid coupling mainly includes:The flange coupling,Spherical shell coupling,Parallel shaft coupling,Key radial flange coupling and Sleeve coupling,Spherical shell coupling：The axial split using two spherical shell to tighten bolts fixed in order to realize the coupling of two shaft connection,iccluding modelJQ25-160.Flange coupling with flange is to put the two and a half coupling respectively connected with two axis using ordinary flat key,then make the two become an organic whole repeatedly in order to transfer movement and torque coupling.Parallel shaft coupling:Using the middle plate through the pin shaft in order to realize the coupling of two parallel shaft connection.Key radial flange coupling:Using radial key and the ordinary bolt coupling half coupling coupling.Sleeve coupling:Using common sleeve connection of two shaft coupling in some way.