Large hydraulic cylinder
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  • Large hydraulic cylinder

Large hydraulic cylinders are actuators that convert hydraulic energy into mechanical energy. They drive the piston rod to perform linear reciprocating motion through the pressure of hydraulic oil, thereby achieving power output and motion control for various mechanical equipment. They are widely used in fields such as engineering, metallurgy, mining, and shipbuilding.

Cylinder Classification

1. Classification by structural form:

- Piston-type hydraulic cylinders: divided into single-acting and double-acting types. Single-acting cylinders use hydraulic oil to push the piston in one direction, with the return stroke relying on external force; double-acting cylinders use hydraulic oil to push the piston in both directions.

- Plunger-type hydraulic cylinders: the plunger is a single moving part, driven by hydraulic oil pressure to perform linear motion. They have a long stroke and are suitable for applications requiring high thrust and long stroke, commonly used in large engineering machinery and mining equipment.

- Telescopic hydraulic cylinders: composed of multiple sleeves, they can achieve a long stroke while occupying a small space. They are commonly used in cranes, excavators, and other equipment requiring long strokes with limited installation space.

2. Classification by installation method:

- Eye-type hydraulic cylinders: have eye structures at both ends, allowing connection with other components. They offer flexible installation and are suitable for various mounting scenarios, such as boom connections in engineering machinery.

- Flange-type hydraulic cylinders: connected to other components via flanges, providing a firm connection. Suitable for applications bearing large loads, such as transmission parts in metallurgical equipment.

- Trunnion-type hydraulic cylinders: the cylinder body can swing around a trunnion, suitable for applications requiring multi-angle movement, such as ship rudder systems.

Design Parameters

1. Basic Parameters

- Cylinder bore diameter (D): calculated based on required thrust and working pressure, the formula is , where is the thrust, is the working pressure.

- Piston rod diameter (d): usually 0.3 to 0.7 times the cylinder bore diameter, i.e., ( is 0.3-0.7), determined according to working pressure and load conditions.

- Stroke (S): determined based on usage requirements, generally 10 to 30 times the cylinder bore diameter.

2. Structural Parameters

- Cylinder wall thickness (δ): calculated using the formula , where is the test pressure (usually 1.25 to 1.5 times the working pressure), is the allowable stress of the material.

- Cylinder head thickness (h): calculated using the formula , where where is the cylinder bore diameter, and

is the allowable stress of the cylinder head material. , where - Minimum guide length (H): where

is the stroke, and

is the cylinder bore diameter.

3. Performance Parameters , where - Working pressure (P): determined according to system requirements, generally 16-35 MPa. - Flow rate (Q):

is the speed, , where is the piston area. - Flow rate (Q):

- Speed (v):

is the flow rate,

Process Introduction

1. Material selection: typically high-strength steels such as 45# steel, 27SiMn, etc., to ensure the strength and wear resistance of the hydraulic cylinder.

2. Processing flow: includes forging, turning, grinding, boring, honing, and other processes to ensure dimensional accuracy and surface roughness of the cylinder and piston rod. Key components such as pistons and seals undergo fine machining and strict inspection.

3. Heat treatment process: the cylinder and piston rod undergo quenching, tempering, and other heat treatments to improve hardness, strength, and wear resistance of the material.

4. Surface treatment: processes such as hard chrome plating and oxidation are applied to enhance wear resistance and corrosion resistance, extending service life.

5. Assembly and debugging: assembled strictly according to process requirements to ensure fit accuracy and motion flexibility of each component. After assembly, rigorous debugging and inspection are conducted to ensure the hydraulic cylinder meets performance specifications.

Scope of Application

1. Engineering field: used to drive components such as booms and arms of engineering machinery like excavators, loaders, and bulldozers, enabling digging, loading, and pushing actions.

2. Metallurgical industry: provides powerful force in equipment such as rolling mills and presses, enabling processes like rolling and pressing of metal materials.

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Large hydraulic cylinder
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  • Large hydraulic cylinder

Large hydraulic cylinder

Large hydraulic cylinders are the core actuators of heavy equipment, used to convert hydraulic energy into linear thrust. The products are classified by structure into piston-type, plunger-type, and telescopic hydraulic cylinders, and by installation into eye-type, flange-type, and trunnion-type hydraulic cylinders. They are suitable for scenarios such as construction machinery, metallurgy and mining, ship ports, and energy equipment. They achieve precise actions and long-lasting stable operation under harsh conditions, making them key components to ensure the efficient operation of large equipment.

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