Spindle structure

A spindle structure, including:

• a base, defining an axial direction;
• a spindle body received in the base, rotatable in the base about the axial direction, the spindle body being formed at a first end with a first receiving room and being formed at a second opposite end with a second receiving room, wherein an end of the first receiving room is a closed blind end and is formed with at least one first gas channel that communicates with the first receiving room, an opening of the at least one first gas channel being formed on an outer face of the spindle body and being defined as a first gas inlet, an other end of the first receiving room being open and being adapted for a first tool holder to insert therein, wherein an end of the second receiving room is a closed blind end and is formed with at least one second gas channel that communicates with the second receiving room, an opening of the at least one second gas channel being formed on an outer face of the spindle body and being defined as a second gas inlet, an other end of the second receiving room being open and being adapted for a second tool holder to insert therein;
• a first sliding member, received in the first receiving room, slidable along the axial direction, a first piston and a first driving portion each being arranged at a respective one of two ends of the first sliding member, the first piston being closer to the blind end of the first receiving room than the first driving portion is, a first gas cavity being defined between the first piston and the blind end of the first receiving room, the first gas cavity communicating with the at least one first gas channel;
• a second sliding member, received in the second-receiving room, slidable along the axial direction, a second piston and a second driving portion each being arranged at a respective one of two ends of the second sliding member, the second piston being closer to the blind end of the second receiving room than the second driving portion is, a second gas cavity being defined between the second piston and the blind end of the second receiving room, the second gas cavity communicating with the at least one second gas channel;
• a first restoring mechanism, arranged in the first receiving room, providing an elastic force to the first sliding member in order to push the first sliding member to move toward the blind end of the first receiving room;
• a second restoring mechanism, arranged in the second receiving room, providing an elastic force to the second sliding member in order to push the second sliding member to move toward the blind end of the second receiving room;
• a first restriction member, received in the first receiving room, connected to the first driving portion of the first sliding member, the first restriction member being adapted for connecting to the first tool holder to selectively prevent the first tool holder from moving outward along the axial direction, the first restriction member being driven by the first sliding member to selectively deform between:
• (i) a fixation position at which the first tool holder is secured, and (ii) a release position at which the first tool holder is released;
• a second restriction member, received in the second receiving room, connected to the second driving portion of the second sliding member, the second restriction member being adapted for connecting to the second tool holder to selectively prevent the second tool holder from moving outward along the axial direction, the second restriction member being driven by the second sliding member to selectively deform between:
• (i) a fixation position at which the second tool holder is secured, and (ii) a release position at which the second tool holder is released;
• and
• a gas valve, disposed on the base, and configured to selectively communicate with the first gas inlet and the second gas inlet, the gas valve being adapted for connecting to a gas source in order to inject gas into the first gas cavity via the first gas channel so that the first sliding member is pushed to slide outward along the axial direction, to thereby drive the first restriction member to deform from the fixation position of the first restriction member to the release position of the first restriction member, the gas valve also being configured to selectively inject gas into the second gas cavity via the second gas channel so that the second sliding member is pushed to slide outward along the axial direction to thereby drive the second restriction member to deform from the fixation position of the second restriction member to the release position of the second restriction member.