The function of the engineering hydraulic cylinder in the hydraulic system is to convert the hydraulic energy into mechanical energy, so that the machine can realize the reciprocating linear motion or the reciprocating swing of less than 360°. Generally, hydraulic cylinders are divided into single-acting hydraulic cylinders, double-acting hydraulic cylinders and differential hydraulic cylinders according to the form of action. Single-acting is that when the piston rod (or plunger) is extended, its action is realized by the action of pressure oil, and when the piston rod (or plunger) is returned, its action is realized by the action of external force (such as the weight of the carriage); while the double-acting hydraulic The extension and return of the cylinder piston rod (or plunger) are realized under the action of pressure oil.
The structural forms of engineering hydraulic cylinders are tie rod type, welding type and flange type. The tie rod type means that the two end caps and the cylinder are connected by four tie rods (bolts), and the two end caps are rectangular or square, which has a simple structure and is easy to manufacture and install. The cylinder barrel can be made of seamless steel pipe with inner hole honing, which can be cut according to the length required by the stroke. However, this type of cylinder is limited by the stroke length, the inner diameter of the cylinder barrel and the working pressure. Generally, the stroke is ≤1.5m, the inner diameter of the cylinder is ≤250mm, and the rated pressure is ≤20MPa. The welded type means that the rear cover and the cylinder barrel are connected by welding, and the front end cover and the cylinder barrel can be connected by internal (or external) threads, or by internal snap keys (or internal snap rings). When using internal (or external) threaded connection between the front end cover and the cylinder barrel,
Due to the limitation of the thread strength of the front end cap and the size of the end cap during preloading, it cannot be used for an excessively large cylinder inner diameter and high working pressure. It is often used for cylinder inner diameter ≤ 200mm and rated pressure ≤ 25MPa. Hydraulic cylinders connected with internal snap keys (or internal snap rings) can be used for larger bores and higher working pressures. The flanged hydraulic cylinder means that the cylinder body and the end cover are connected with flanged screws (bolts), and the rear end cover can also be welded with the cylinder barrel. These cylinders have larger dimensions.
Suitable for large and medium-sized engineering hydraulic cylinders, the cylinder diameter is usually larger than 100mm, the rated working pressure is 25-40MPa, and it can withstand large impact loads and harsh external environmental conditions. Hydraulic cylinders are divided into plunger hydraulic cylinders, piston hydraulic cylinders and sleeve hydraulic cylinders according to their internal structure.
www.rodandtubechina.com
