Mounting device

The utility model provides an installation device which is used for installing a pipe joint assembly, the pipe joint assembly comprises a first pipe section and a second pipe section which are connected in sequence, the installation device comprises a supporting cylinder, and at least part of the peripheral wall of the supporting cylinder abuts against the inner wall of the first pipe section so that the supporting cylinder and the first pipe section can move synchronously; at least part of the clamping assembly is arranged in the supporting barrel, the clamping assembly comprises a clamping part, and the clamping part extends out of the end of the supporting barrel so as to extend into the second pipe section; the clamping part comprises a plurality of clamping jaws, and after the supporting barrel abuts against the first pipe section, the clamping jaws are far away from one another so as to abut against the inner wall of the second pipe section, so that the supporting barrel is operated to rotate, and the f