Improved friction roller of two-for-one twister and mounting structure of improved friction roller

The utility model relates to the technical field of textile machinery, and discloses an improved friction roller of a two-for-one twister, which comprises a friction roller, friction rings are arranged at two ends of the friction roller, and the friction roller is movably connected to a support. The utility model further discloses an installation structure which is applied to the improved friction roller of the two-for-one twister, a groove is formed in one end of the support, a first limiting piece and a second limiting piece are arranged in the support, the first limiting piece is rotationally connected with the second limiting piece, the first limiting piece is located in the groove, and the second limiting piece is located in the groove. The second limiting piece is located on the inner wall of the support. A groove is formed in the first limiting piece, a notch is formed in one side of the groove, a dismounting and mounting plate is detachably connected into the groove and detachably connected with the f