Jacks are mainly used in factories, mines, transportation and other departments as vehicle repair and other lifting and support work. Its structure is light, strong, flexible and reliable, and can be carried and operated by one person.
In principle, the most basic principle on which hydraulic jacks are based is Pascal's law, which means that the pressure of the liquid is the same everywhere. The hydraulic jacks that people commonly see use this principle to achieve force transmission. It is used as an intermediate medium in the hydraulic transmission system, which plays the role of transmitting and converting energy.
The screw jack moves the handle back and forth, and pulling the claw pushes the ratchet clearance to rotate, and the small bevel gear drives the large bevel gear to rotate the lifting screw, so that the lifting sleeve can be lifted or lowered to achieve the function of lifting and pulling force, but it is not as good as Simple hydraulic jack. The thread of the screw jack has no self-locking effect and is equipped with a brake. When the brake is released, the heavy object can descend quickly by itself, shortening the return time, but the structure of this jack is more complicated.
Electric jack: The jack is equipped with a pressure-maintaining device to prevent overpressure. If the overpressure occurs, the jack will not return to a certain position. The special structure can play a double protection role for the jack. After the lower jack is equipped with a diving device, it can be realized Low height achieves the purpose of high stroke.