hydraulic jacks The front flange is able to apply force in both directions, which means that by applying pressure to either side piston in a jack , the force is created in that direction. Each hydraulic jack consists of a body, end caps, piston and piston rod. Applying fluid pressure to each side of the piston causes the piston to move to one side inside the body of the hydraulic jack. The piston rod that comes out from the end of the hydraulic jack transfers the power to the output mechanism of the system. The fluid is directed into the hydraulic jack through the connections installed on the opening of the covers.
The size of a hydraulic jack usually indicates the internal diameter of the jack body. Inside Cover Piston rod guide, sealing rings, seals and bearings are also installed. The sealing ring is necessary to create enough pressure in the jack. Bearings are necessary to restrain the lateral force to the piston rod and the dust collector ring to prevent contamination from entering the hydraulic jack. The sealing and dust collector rings are usually rubber. Bearings are usually made of soft metals such as bronze, hard plastic or composite. The internal surface of the jack and the surface of the piston rod must be completely polished to prevent wear and tear and damage to the sealing rings.

This type of jack is the most common type of hydraulic jack. Of course, in industrial equipment, different types of jacks are used. The single-action jack applies force in only one direction and when the fluid pressure is cut off, it automatically returns to its initial state. Hydraulic jack can be of tension or compression type. In a pressure hydraulic jack, the jack applies force when moving forward, and as soon as the pressure is removed from the cylinder, it will automatically move back. Hydraulic jack is a traction tool that applies force when moving backwards and will automatically move forward as soon as the pressure is removed from it. The return movement in a single-action hydraulic jack may be done by an internal spring, or an external weight. can be In this type of jacks, the opening of the front cover, the opening of the fluid pressure and the opening of the rear cap open to the open air. By removing the fluid pressure, the jack will automatically move forward and the fluid entered into the jack will be discharged to the hydraulic tank.

Hydraulic elevators have different types and can be equipped with one or two jacks directly or indirectly. The basis of the operation of these types of elevators is the pressure and flow of hydraulic oil, and the flow control valve is responsible for regulating and adjusting the oil flow for the desired movement of the elevator. Heavy, industrial cargo elevators, special systems, etc. often work with hydraulic mechanisms. The main characteristics of the hydraulic system define their application. These types of elevators are suitable for handling height and low to medium speed, and almost unlimited load capacity. Most of the home elevators are implemented in buildings and villas with two or three floors with a hydraulic system. Also, most car lifts and super heavy lifts operate using hydraulic mechanisms.

If the elevator jack is directly connected to the cabin (yoke or carsling), it is called a direct jack hydraulic elevator. In this case, the towing wire or chain and, accordingly, the pulley or chain wheel have been removed.

In indirect jack hydraulic elevators, the jack is connected to the cabin by a towing wire. In this conventional alcove, a plate is installed on the jack. The towing wires are fixed to the support on one side, they are attached to the car sling from the other side.

Each layer of telescopic cylinders is a steel shell that is placed in the shell of the previous layer. Telescopic jack shown in the picture below is a three-story cylinder. Of course, the standard types of these cylinders have up to five floors. One of the uses of telescopic jack is to lift the load part of dump trucks. The length of this cylinder when opened should be large enough to deflect the load part of the truck by 60-70 degrees, and also in the closed state, it should be short enough to easily fit horizontally under the load part. Telescopic cylinders are available in two types, single-acting and double-acting. Telescopic double cylinders cannot produce significant force in the backward movement, because the effective area of the piston in the front of the cylinder is too small. Telescopic cylinders are more expensive than standard cylinders due to their complex structure. The double cylinder with double rod is a type of double hydraulic cylinder whose piston rod is protruding from both sides. By connecting the rods piston, two different mechanical mechanisms can be used for each forward or backward movement, and therefore the efficiency of such cylinders in applications In particular, it is very good. Due to the double bearing in double rod cylinders, these cylinders can withstand more lateral loads.