The classification of the trailer jack

1. Screw jack: the screw of screw jack has no self-locking effect and is equipped with brake. When the brake is released, the weight can drop rapidly by itself and shorten the return time, but the structure of this jack is more complex.

2. Hydraulic jack: used as an intermediate medium in the hydraulic transmission system to transfer and convert energy. When used, it also plays the role of lubrication, anti-corrosion, cooling and flushing of various components in the hydraulic system.

3. Electric jack: a pressure maintaining device is installed inside the jack to prevent overpressure. If overpressure occurs, the jack will not return to a certain position. The special structure can play a dual protective role for the jack. After the lower jack is installed with the diving device, the purpose of low height and high stroke can be achieved.