Automatic pallet changer

An automatic pallet changer, comprising:

• a pallet lifting mechanism having a pallet platform and a lifting rod fastened with a bottom of said pallet platform such that said lifting rod can be actuated along with said pallet platform to ascend or descend linearly by means of oil pressure, said lifting rod having a body which is provided with a vertically-oriented first position confining portion;
• a revolving mechanism having a gear and a rack gear member, said gear being pivoted to a bottom of said pallet lifting mechanism at a fixed height and provided axially with a slide channel for locating slidably said lifting rod, wherein said gear is pivoted at an upper end thereof and a lower end thereof in a stand by a bevel roller bearing, wherein said slide channel is provided in an inner side thereof with a vertically-oriented second position confining portion complementary in shape to said first position confining portion for enabling said lifting rod and said pallet platform to turn synchronously, said rack gear member being engaged with said gear so as to drive said gear to turn;
• and
• a fastening seat mounted on said stand such that a top of said fastening seat, said pallet platform, and said lifting rod form together a first oil chamber, and that a midsection of said fastening seat and said lifting rod form together a second oil chamber;
• and wherein said pallet lifting mechanism is actuated to engage in a linear motion by injection of oil into and discharge of oil from said first oil chamber and said second oil chamber.