What are the uses of hydraulic cylinders?

Date:18 May 2020

Hydraulic cylinders are usually used in mechanical work […]

Hydraulic cylinders are usually used in mechanical work, most people do n’t know it, and have n’t even heard of it. Here are some hydraulic cylinders and their working principles:

Working principle of hydraulic cylinder

Hydraulic transmission principle-Using oil as the working medium, transmitting motion through the change of the sealed volume, and transmitting power through the pressure inside the oil.
1. Control part-used to control and adjust the pressure, flow and flow direction of the oil For example: pressure control valve, flow control valve and directional control valve.
2. Execution part-convert the hydraulic pressure input by the hydraulic pump into mechanical energy that drives the working mechanism. For example: hydraulic cylinder, hydraulic motor.
3. Power part-convert the mechanical energy of the prime mover into the pressure energy (hydraulic energy) of the oil. For example: hydraulic pump.


4. Auxiliary parts-connect the previous three parts together to form a system, which functions as oil storage, filtration, measurement and sealing. For example: pipelines and joints, fuel tanks, filters, accumulators, seals and control instruments.
The pressure applied at any point on a certain volume of liquid can be transmitted in all directions with equal magnitude. This means that when multiple hydraulic cylinders are used, each hydraulic cylinder will pull or push at its own speed, and these speeds depend on The pressure required to move the load.
Under the same hydraulic cylinder load capacity range, the hydraulic cylinder carrying the smallest load will move first, and the hydraulic cylinder carrying the largest load will move last.
In order to make the hydraulic cylinder move synchronously, so that the load is lifted at the same speed at any point, it is necessary to use control valves or synchronized lifting system components in the system.

Hydraulic accessories  is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable work. When it is used to realize the reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the movement is stable, so it is widely used in the hydraulic system of various machinery. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference between the two sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and exhaust device depend on the specific application, other devices are essential.