Heat setting device for yarn two-for-one twisting process in spinning machine

The utility model discloses a heat setting device for a yarn two-for-one twisting process in a spinning machine, which comprises a heating shell and a shell cover, the heating shell and the shell cover are spliced together, a cavity for heating and setting yarns is formed in the heating shell and the shell cover, and a first yarn hole and a second yarn hole are formed in the front side of the heating shell. A fourth thread hole and a third thread hole are formed in the rear side of the heating shell, and a guide wheel is installed between the third thread hole and the fourth thread hole. Yarn passes through the first yarn hole, the third yarn hole, the fourth yarn hole and the second yarn hole in the heating shell in sequence, in the process, the yarn is connected with external steam through the steam guide pipe, steam is sprayed out from the steam spraying holes in the top wall and the bottom wall of the heating shell, the yarn passing through the interior of the heating shell can be fully heated, and the he