What if the jack can't come down

What if two or three tons of small jacks can't be retracted?

1. The hydraulic jack is retracted to unscrew the hydraulic valve to remove the hydraulic pressure.

2. The screw of the screw jack has no self-locking effect and is equipped with a brake. Release the brake and the jack can descend quickly by itself.

Jack is refers to the use of rigid top lift as a working device, through the top seat or the bottom of the small stroke of the claw to open the heavy light small lifting equipment. Jacks are mainly used in factories and mines, transportation and other departments as vehicle repair and other lifting, support and other work. Its structure is light and strong, flexible and reliable, one person can carry and operate.

What if the jack goes up and doesn't go down? To learn the working principle of the jack, after the small jack can not shrink back these problems are not a problem. Jacks are divided into mechanical jacks and hydraulic jacks, etc., the principle is different. In principle, hydraulic transmission is based on the most basic principle is PASCAL's law, that is, fluid pressure is the same everywhere. Thus, in an equilibrium system, less pressure is applied on the smaller piston and more pressure is applied on the larger piston to keep the liquid stationary. So through the transfer of liquid, you can get different pressure on different ends, and you can achieve the purpose of a transformation. Hydraulic jacks commonly seen by people are the use of this principle to achieve the transmission of force. Screw jacks used to pull the handle, pull the claw that is to promote the ratchet clearance rotation, small bevel gear drive bevel gear, so that the weight lifting screw rotation, so that the lifting sleeve to get up or down, and achieve the function of lifting tension, but not as simple as hydraulic jacks.