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Draw lessons from the steering device of ordinary full trailer), multi-bar turntable (draw lessons from the steering device of hydraulic suspension trailer), and wheel steering type of semi-trailer whose shafts are driven by steering drive cylinders. The platform height of semi-trailer with single turntable steering device is relatively high.
; Semi-trailer equipped with multi-lever turntable steering device is expensive to manufacture and use.
; Multi-axle semi-trailer is equipped with wheel steering device, and each axle is driven by steering drive cylinder. Its platform height is lower than that of semi-trailer equipped with single wheel steering device, and its manufacturing and use cost is not high, but the axle is more prone to deviation during operation. In order to adjust the deviated axes, each axis needs debugging, which is complicated and time-consuming.
In order to solve the above technical problems, the patent number: CN 201510710220 discloses a semi-trailer steering device. The specific content is to use the front axle to drive, and use the longitudinal pull rod to adjust the turning radius of the rear axle, so that the turning radius is greatly reduced and it is convenient to pass through the curved mountain road. In practical use, due to the rugged mountain road, the steering seat and the longitudinal bar in the device are on the same horizontal plane. In the long-term transportation process, the longitudinal bar is easy to break and appear fine lines due to bumps, which has certain security risks.