The utility model relates to
agricultural machinery, in particular to an oil cylinder capable of adjusting the jacking height of a
plough. Comprising a cylinder body and a
piston rod, the lower portion of the
piston rod is located in the cylinder body and fixedly provided with a
piston, the piston and the cylinder body slide relatively, the piston divides the cylinder body into an upper oil cavity and a lower oil cavity, the upper oil cavity is communicated with an oil
nozzle, and the lower oil cavity is communicated with an oil port in a valve block through an oil
pipe and a hydraulic oil channel in the valve block; the valve block is fixed to the top end of the outer side wall of the cylinder body, a hydraulic oil channel in the valve block comprises a valve cavity, a valve rod is arranged in the valve cavity, and the top end of the valve rod extends out of the top surface of the valve block. The upper portion of the
piston rod is located outside the cylinder body, a limiting clamp is fixed to the
piston rod located outside the cylinder body, the relative position between the limiting clamp and the
piston rod is adjustable, and the surface of the bottom of the limiting clamp plays a role in limiting the valve rod. The jacking height of the
plough can be accurately adjusted, it is guaranteed that the jacking height of the
plough is not changed all the time in the working process of the plough, and it is guaranteed that the ploughing depth is consistent all the time.