What is the working principle of a truck crane?
In addition there are some car cranes inside the telescopic arm mounted with a plunger-type cylinder, but this application is rare.
The rotary drum is driven by a hydraulic motor, so you can see two tubing, but do not treat the cylinder.
When retracted, the reel retracts the wire rope and the boom retracts under heavy duty.
In the middle of the boom there is a rotating reel, the top of the wire rope around the rope through the pulley at the top of the next arm, the upper part of the boom to pull out, and so on.
Because the multi-stage plunger cylinder is expensive, and the boom will be loaded when the elastic bending, a great impact on the life of the cylinder
