Cotton transport trailer

The utility model relates to a truck cab tilting device, comprising a single action cylinder, a support seat, a hose, a cab, an oil supply system and an oil controlling system, the upper and lower end of the single action cylinder are connected to the support seats of the cab and the frame respectively by two shafts, the lower end of the single action cylinder is connected with the oil supply system by the hose. The utility model adopts the single action cylinder as the tilting cylinder, thus the lifting oil pump only works during the cab lifting, and saves the lifting stop device. When supplying oil to the cylinder, the cylinder extends and the cab begin to tilt and lift; when lifting to the stop position, the oil controlling system will close the oil supply, the cylinder will keep the extended status; when the cab needs to return back, opening the oil supply, the cab will return to the former position depending on the cab own weight, and the cab lifting speed is controlled by controlling the supplied oil amount or returned oil amount. The model has the advantages of energy saving, low cost, low price and convenient operation.