Multi-position rotary joint device for milling head

The multi-position rotary joint device for the milling head comprises a valve body and a plurality of independent joints, a plurality of round holes are formed in the valve body, each joint is rotatably inserted into one round hole, a group of steel balls and a circle of sealing ring are arranged between the radial outer side of each joint and the valve body, a center hole is formed in each joint, and the center hole is communicated with the valve body. A plurality of liquid conveying holes are formed in the valve body, an inlet of each center hole is communicated with a milling head pipeline, an outlet of each center hole is communicated with an inlet of one liquid conveying hole, and an outlet of each liquid conveying hole is communicated with a milling head. After the device is installed, when the milling head rotates, the valve body and all the connectors rotate along with the milling head, each connector can rotate around the axis of the connector in the opposite direction under the action of a set of st