Quick changing type mechanical arm

The utility model relates to a mechanical arm, in particular to a quick changing type mechanical arm which is used for a synchronizer gear sleeve during heating and quenching. The quick changing type mechanical arm comprises a left support and a right support. Two claw sheet bases are fastened on the left support and the right support respectively and provided with clamping grooves, claw sheets are placed on the inner sides of the clamping grooves, springs are arranged on the outer sides of the clamping grooves, and pressing sheets are placed between the claw sheets and the springs. The clamping grooves are rectangular, and the springs are round wire spiral springs. Each set of claw sheets can be suitable for gear sleeves with the diameter changing range of 15 mm, and the mechanical arm can be suitable for gear sleeves with different specifications only through four sets of claw sheets. The claw sheets of the mechanical arm are replaced rapidly and can be replaced in one minute, and the working efficiency is improved.