1. Since the fork-pull structure is added between the front and rear arms, the operation is quite convenient and labor-saving.

　　2. The rotary joint has developed a structure in which the positioning and sealing of a row of balls are automatically improved with the increase of temperature, which greatly improves the flexibility of rotation and the reliability of sealing.

　　3. The seal replacement of the rotary joint does not need to be dismantled from the pipe. It can be done conveniently by manipulating the body, which reduces the maintenance workload and maintenance costs.

　　4. The adjustment range is large, up to 6 meters. Generally, the trestle bridge does not need to disintegrate the oil dragon.

　　 5. The operating environment of the trestle bridge has been purified due to the addition of the oil receiver.

　　 6. There is no dragon throwing phenomenon

　　7. Low cost.