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       Hydraulic cylinders are an indispensable part of the hydraulic systems in engineering machinery. There are many types of hydraulic cylinders. Hydraulic cylinders have the following advantages:

　　Advantage 1: Pneumatic systems generally use pressures in the range of 0.2-1.0 MPa, so pneumatic cylinders cannot be used to manufacture high-power power components. Hydraulic cylinders can manufacture high-power components using hydraulic systems.

　　Advantage 2: In terms of medium, air is inexhaustible, with no cost or supply difficulties. The used gas is directly discharged into the atmosphere, making disposal convenient, non-polluting, unlike hydraulic oil.

　　Advantage 3: Air has low viscosity and lower resistance than hydraulic oil.

　　Advantage 4: However, the compressibility of air is far greater than that of hydraulic oil, so its operational stability and response are poor. Hydraulic cylinders are important actuators in hydraulic systems. They convert hydraulic energy into mechanical energy and cooperate with various transmission mechanisms to complete various mechanical movements.

　　Hydraulic cylinders have the characteristics of simple structure, large output force, stable performance, convenient use and maintenance, and wide applicability. According to structural characteristics, hydraulic cylinders can be divided into three types: ① Piston-type hydraulic cylinders, ② Plunger-type hydraulic cylinders, ③ Composite hydraulic cylinders. Each type of cylinder has its own characteristics. Let's take a look at the differences between these hydraulic cylinders.

　　1. Piston-type hydraulic cylinder

　　Piston-type hydraulic cylinders mainly work by alternately delivering oil to both sides of the cylinder piston. The pressure difference between the hydraulic oil on both sides of the piston enables reciprocating motion of the piston. More applications often involve hydraulic transmission. To increase the piston's forward speed, the return oil in the cylinder can be directly injected into the oil pipe through valve control, and then the method of participating in piston propulsion can be completed to achieve rapid movement of the piston.

　2. Plunger-type hydraulic cylinder

　　In hydraulic transmission, if the machine moves a longer distance, this type of plunger hydraulic cylinder is usually required. The piston in the cylinder is replaced by an axial plunger, which is a characteristic of the hydraulic cylinder, different from the piston hydraulic cylinder. Another characteristic is that pressure oil is delivered only in one direction, applying pressure in one direction to generate thrust and thus move the plunger.

　　3. Composite hydraulic cylinder

　　Composite hydraulic cylinders work by combining a plunger and a piston. After the hydraulic oil enters the cylinder from the plunger hole, it can quickly move the clamping device forward. When the clamping device is nearing completion, the clamping cylinder enters the hydraulic cylinder. When the stroke speed slows down, the clamping force reaches the required tonnage.

　　The type of hydraulic cylinder selected depends on the engineering machinery equipment used. As mentioned earlier, we know that different types of hydraulic cylinders have significant differences in working principles and characteristics. Therefore, when purchasing a hydraulic cylinder, it is necessary to confirm the type of hydraulic cylinder that meets your needs to ensure compatibility with the equipment.