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Working principle of hydraulic cylinder and oil cylinder

Writer:力丰bbinNumber of visits: Date:2011-10-20

Actuator in hydraulic system. Generally by the cylinder, cylinder rod (piston rod) and seals, the piston is divided into two parts by the piston, respectively, through an oil hole. Due to the liquid compression ratio is very small, so when which a hole oil into the oil, the piston will be made to promote the another oil hole oil, the piston to drive the piston rod to do out of the (retracted) movement, and vice versa.
Working principle of hydraulic cylinder
First to say that it's the most basic 5 parts:
1- cylinder and cylinder head
2- piston and piston rod
3- sealing device
4- buffer device
5- exhaust device.
The working principle of each cylinder is almost similar, with a manual jack, the jack is actually the most simple cylinder. Through manual pressure boost stalk (manual hydraulic pump) the hydraulic oil through a one-way valve into the cylinder, then enter the oil cylinder and a hydraulic oil because single valve can't go backwards back, forcing the cylinder rod to, then work to continue to the hydraulic oil in the hydraulic cylinder, so continue to rise, to lower the open hydraulic valve, the hydraulic oil to the oil tank, this is the most simple working principle, the other is improved on this basis, the principle of the cylinder and the cylinder is basically the same.
According to the structural form of the common hydraulic cylinder, it can be divided into four types: 1 piston type 3 plunger type 2 telescopic 4 swing type
Advantages and disadvantages of oil cylinders and cylinders
Advantages 1
Due to the use of pressure in the pneumatic system is generally in the range of 0.2-1.0Mpa, so the cylinder is not a big power of the power components. Hydraulic cylinder can be done relatively large power of the components, the use of hydraulic system
Advantages 2
From the medium speaking air can be inexhaustible, no cost and supply difficulties, the used gas is directly discharged into the atmosphere, convenient processing, can not be polluted, and the hydraulic oil is opposite
Advantages 3
Air viscosity is small, the resistance is less than the hydraulic oil
Advantages 4
But the compression rate of the air is much greater than the hydraulic oil, so it is very far away from the work stability and response.
Hydraulic cylinder is the most important component in the hydraulic system, it will be able to convert hydraulic power, and with a variety of transmission mechanism to complete a variety of mechanical movement. The hydraulic cylinder has the characteristics of simple structure, large output force, stable and reliable performance, convenient use and maintenance, wide application range, etc..
Cylinder processing
Oil cylinder is the most important part of construction machinery traditional processing method of pulling and cutting cylinder block - fine boring cylinder - grinding cylinder. By rolling method of broaching cylinder fine boring cylinder, the rolling cylinder, process is part 3, but time contrast: grinding cylinder 1 meter probably in 1-2 days time, rolling cylinder 1 meter in about 10 to 30 minutes at a time. In contrast to grinding or sewing mill (tens of thousands of millions --), rolling knife (1 thousand - tens of thousands). After rolling, the hole surface roughness degree by building roll former ra3.2 ~ 6.3 µ m decreases as Ra0.4 ~ 0.8 µ m, hole surface hardness increases by about 30%, the cylinder surface fatigue strength increased by 25%. If the cylinder service life is only considered the influence of the cylinder, the rolling process is improved by 2 to 3 times, and the efficiency of the grinding process is increased by 3 times compared with the grinding process. The above data shows that the rolling process is efficient and can greatly improve the surface quality of the cylinder.
Characteristics of oil cylinder rolling processing contrast cylinder after rolling
No sharp edges on the surface, a long time of motion friction will not damage the sealing ring or seal, which is particularly important in the hydraulic industry.
Rolling principle
It is a kind of pressure light processing, is the use of metal at room temperature in the state of cold plastic characteristics, use rolling tool to exert some pressure on the surface of the workpiece, the workpiece surface of metal plastic flow, fill in the original residual indentation trough, and reach the surface roughness value is reduced. Due to the rolling surface of metal plastic deformation, the surface microstructure of cold hardening and grain fining, forming a dense fibrous, and the formation of residual stress layer, the hardness and strength increase, so as to improve the surface wear resistance, corrosion resistance and compliance. Rolling is a kind of plastic processing method without cutting.
No cutting processing technology is safe and convenient, and can accurately control the precision:
1 improve the surface roughness, roughness can reach Ra less than 0.08 around M.
2 correct roundness, ovality can be less than 0.01mm.
3 improve the surface hardness, the deformation is eliminated, the hardness increased more than 4 DEG HV
4 residual stress layer is processed and the fatigue strength is increased by 30%.
5 improve the quality, reduce wear and prolong the service life of the parts, but the cost of the parts is reduced.
The cylinder is the most important part of construction machinery, the traditional processing method is: pull cut cylinder - fine boring cylinder - grinding cylinder. By rolling method is: broaching block, fine boring cylinder rolling cylinder, process is part 3, but time contrast: grinding cylinder 1 meter probably in 1-2 days time, rolling cylinder 1 meter in about 10 to 30 minutes at a time. In contrast: grinder or article mill (tens of thousands of millions --), rolling knife (1 thousand - tens of thousands). After rolling, the hole surface roughness degree by building roll former ra3.2 ~ 6.3 µ m decreases as Ra0.4 ~ 0.8 µ m, hole surface hardness increases by about 30%, the cylinder surface fatigue strength increased by 25%. If the cylinder service life is only considering the influence of the cylinder, it can increase 2 ~ 3 times. The efficiency of the boring rolling process is improved by 3 compared with the grinding process.

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