Parker hydraulic cylinder from the United States

Parker hydraulic cylinder from the United StatesWorking principle andAdvantage:

The casing of turbines, rotary piston engines, etc. is commonly referred to as'cylinder'Application areas of cylinders:printing(tension control)Semiconductor(Spot welding machine, chip grinding)Automation control, robots, and so on.

(1)The requirements for users are relatively low. The principle and structure of the cylinder are simple, easy to install and maintain, and have low requirements for users. Electric cylinders are different. Engineering personnel must have a certain level of electrical knowledge, otherwise it is highly likely to be damaged due to misoperation.

(2)High output power. The output force of a cylinder is proportional to the square of the cylinder diameter;The output force of an electric cylinder is related to three factors: cylinder diameter, motor power, and screw pitch. The larger the cylinder diameter and power, and the smaller the screw pitch, the greater the output force. A cylinder diameter of50mmThe theoretical output force of the cylinder can reach2000NFor electric cylinders with the same diameter, although products from different companies may vary, they generally do not exceed1000NIt is obvious that cylinders have an advantage in terms of output force.

(3)Strong adaptability. Cylinders can work normally in high and low temperature environments and have dust and water resistance, and can adapt to various harsh environments. However, due to the large number of electrical components, electric cylinders have high environmental requirements and poor adaptability.

Parker hydraulic cylinder from the United StatesBasic Concepts

The cavity for placing pistons on the cylinder block of an internal combustion engine. It is the trajectory of piston movement, in which gas burns and expands. Through the cylinder wall, it can also dissipate some of the residual heat from the gas explosion, keeping the engine at normal operating temperature.

There are two types of cylinders: integral and single cast. Single casting is divided into two types: dry and wet. When the cylinder and cylinder body are cast as a whole, it is called an integral cylinder;When the cylinder and cylinder body are cast separately, the single cast cylinder barrel is called the cylinder liner.

The cylinder liner that comes into direct contact with the cooling water is called a wet cylinder liner;Dry cylinder liners are those that do not come into direct contact with cooling water. In order to maintain the tightness of the contact between the cylinder and the piston and reduce the friction loss of the piston during its movement, the inner wall of the cylinder should have high machining accuracy and precise shape and size.

1P4MA0004941cylinderCommon Faultsproblem

Cylinders are cast and undergo aging treatment after leaving the factory to eliminate internal stresses generated during the casting process. If the aging time is short, the processed cylinder will still deform during future operation.

The force situation of the cylinder during operation is very complex. In addition to static loads such as the pressure difference between the gas inside and outside the cylinder and the weight of various components installed inside it, it also has to bear the reaction force of steam flowing out of the stationary blades on the stationary part, as well as the force of various connecting pipelines in cold and hot states on the cylinder. Under the interaction of these forces, the cylinder is prone to plastic deformation and leakage.

The load on the cylinder increases or decreases too quickly, especially during rapid start-up, shutdown, and changes in operating conditions, with large temperature changes, incorrect warm-up methods, and premature opening of insulation layers during shutdown maintenance, resulting in significant thermal stress and deformation in the cylinder and flange.

During the machining process or after welding repair, stress was generated in the cylinder, but the cylinder was not tempered to eliminate it, resulting in significant residual stress and deformation during operation.

During installation or maintenance, due to maintenance processes and techniques, the expansion gaps of the inner cylinder, cylinder partition, partition sleeve, and steam sleeve sleeve are not suitable, or the expansion gaps of the hanging ear pressure plate are not suitable, resulting in huge expansion forces that deform the cylinder after operation.

Poor quality, excessive impurities, or incorrect model of cylinder sealant used;If there are hard impurities particles in the cylinder sealant, it will make it difficult for the sealing surface to bond tightly.

Insufficient tightening force of cylinder bolts or unqualified material of bolts. The tightness of the cylinder joint surface is mainly achieved by the tightening force of the bolts. The thermal stress and high temperature generated during the start stop or load increase/decrease of the unit can cause stress relaxation of the bolts. If the stress is insufficient, the pre tightening force of the bolts will gradually decrease. If the bolt material of the cylinder is not good, the bolt will be stretched under the action of thermal stress and cylinder expansion force during long-term operation, resulting in plastic deformation or fracture, insufficient tightening force, and leakage of the cylinder.

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