Structure of hydraulic cylinder

The hydraulic cylinder is usually composed of rear end cover, cylinder barrel, piston rod, piston assembly, front end cover and other main parts; In order to prevent oil from leaking out of the hydraulic cylinder or from the high pressure chamber to the low pressure chamber, a sealing device is set between the cylinder barrel and the end cover, piston and piston rod, piston and cylinder barrel, piston rod and front end cover, and a dust-proof device is also set outside the front end cover; In order to prevent the piston from hitting the cylinder head when it quickly returns to the end of the stroke, a buffer device is also set at the end of the hydraulic cylinder; Sometimes it is also necessary to set exhaust device.
Cylinder block assembly
The sealing cavity formed by the cylinder block assembly and the piston assembly bears the effect of oil pressure. Therefore, the cylinder block assembly should have sufficient strength, high surface accuracy and reliable sealing.
(1) Flange connection is simple in structure, convenient in processing and reliable in connection. However, it requires sufficient wall thickness at the end of the cylinder barrel to install bolts or screw in screws. It is a common connection form.
(2) Semi-ring connection is divided into two types of connection: outer semi-ring connection and inner semi-ring connection. The semi-ring connection has good process, reliable connection and compact structure, but it weakens the strength of the cylinder barrel. Semi-ring connection is widely used in the connection of seamless steel cylinder and end cover.
(3) There are two types of threaded connection: external thread connection and internal thread connection. They are characterized by small size, light weight and compact structure, but the cylinder end structure is complex. This connection type is generally used in situations requiring small size and light weight.
(4) The pull rod type connection has simple structure, good technology and strong versatility, but the volume and weight of the end cover are large, and the pull rod will stretch longer after being stressed, affecting the effect. It is only applicable to medium and low pressure hydraulic cylinders with small length.
(5) Welded connection has high strength and simple manufacturing, but it is easy to cause cylinder deformation during welding.