Roller structure with adjustable diameter and hair-tangling prevention function, and hair curler thereof

A roller structure with an adjustable diameter and a hair-tangling prevention function, comprising an end support and at least two heat conduction plates (1), wherein the end support is connected to end parts of the heat conduction plates (1), and a plurality of the heat conduction plates (1) can be all moved radially relative to the end support in a radial direction of the end support;

• and the roller structure with an adjustable diameter and a hair-tangling prevention function further comprises a hair-tangling prevention member (11), wherein the hair-tangling prevention member (11) is arranged on a periphery of a gap (4) at which the heat conduction plates (1) are connected with the end support, and the hair-tangling prevention member (11) is disposed between the end support and the heat conduction plates (1);
• and
• wherein the hair-tangling prevention member (11) is provided with a plurality of radial extension portions (12) protruding from an outer wall of the roller structure to a center of the roller structure, and each of the plurality of radial extension portions (12) is located at a circumferential slit (5) at which the two adjacent heat conduction plates (1) are circumferentially joined to prevent hair filaments from inserting into the circumferential slit (5);
• and a plurality of avoidance spaces (31) are defined on a bottom end of the end support facing towards the heat conduction plates (1) along a circumferential direction of the end support, and the plurality of radial extension portions (12) are accommodated in the plurality of avoidance spaces (31) respectively to make the plurality of radial extension portions (12) closer to the end support.