Swing Cylinder
Product description:

A swing cylinder, also known as a hydraulic swing cylinder or boom swing cylinder, is a key component used in construction machinery, excavators, cranes, and heavy equipment. It converts hydraulic energy into controlled rotational or swinging motion, allowing booms, arms, or other mechanical parts to swing smoothly and accurately.

The swing cylinder plays a vital role in ensuring flexible, stable, and powerful operation of construction and mining machines. It provides the necessary torque to rotate or position mechanical structures, improving productivity, precision, and operational safety in various applications.

hydraulic cylinders are actuators that convert hydraulic energy into linear mechanical force. They have a compact structure, high output force, and smooth operation. They are the core components for performing actions such as pushing, pulling, lifting, and pressing in various mechanical and industrial systems, and are widely used in construction machinery, metallurgy, mining, shipping, and other fields.

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Working Principle and Structure

The hydraulic swing cylinder works on the principle of hydraulic pressure acting on a piston to generate linear motion. This motion is then converted into angular or rotational movement through a linkage mechanism or clevis connection.

The cylinder is typically composed of:

• Cylinder barrel – precision honed for high sealing efficiency.
• Piston and piston rod – transfer hydraulic force to mechanical movement.
• Sealing system – prevents oil leakage and ensures stable pressure.
• Mounting ends or trunnions – connect the cylinder to the machine frame or boom structure.
• In excavators or cranes, the swing cylinder is usually double-acting, providing power in both directions for smooth, controlled rotation. The use of high-pressure hydraulic oil allows precise control even under heavy loads or extreme conditions.

Material and Manufacturing Process

The swing cylinder body is made from high-strength alloy steel or seamless Precision steel tubes, ensuring resistance to pressure, impact, and fatigue. The piston rod undergoes hard chrome plating or QPQ nitriding to enhance corrosion resistance and extend service life.

All components are CNC machined for tight tolerances, ensuring perfect alignment and smooth operation. The welding process uses automated technology for consistent quality, while the sealing system employs durable brands like Parker, Hallite, and NOK to guarantee leak-free performance.

Each swing cylinder passes strict testing under ISO, DIN, and CE quality standards to ensure excellent reliability and long-term durability in harsh working environments.

Key Features and Benefits

• Smooth and Stable Swing Motion – Ensures precise control and accurate positioning of machinery components.
• High Pressure Resistance – Designed to handle pressures up to 35 MPa, ideal for heavy-duty applications.
• Durable Construction – Built with premium materials and treated surfaces for long life and reliability.
• Superior Sealing System – Advanced seals eliminate internal leakage and ensure consistent hydraulic performance.
• Customizable Design – Available in multiple bore sizes, strokes, and mounting configurations.
• Low Maintenance Requirements – Simple structure with easy access to seals and components for servicing.
• Corrosion and Impact Resistance – Perfect for outdoor and off-road environments.

Working principle of hydraulic cylinder:

Applications:

The hydraulic cylinder is an energy conversion device that converts hydraulic energy into mechanical energy. It is the core executive component in the hydraulic system. The hydraulic cylinder uses hydraulic oil to drive the piston to move, converting hydraulic energy into linear reciprocating motion. When the hydraulic oil enters the cylinder barrel, it pushes the piston rod to extend or retract, completing the predetermined action. The direction and speed of its movement are regulated by the hydraulic control system. The hydraulic cylinder consists of a cylinder barrel, cylinder cover, piston and piston rod, sealing device, and buffering device. According to its structure, it can be classified as piston type, plunger type, multi-stage telescopic sleeve type, and gear rack type. Hydraulic cylinders are widely used in machine tools, construction machinery, vehicles, and other fields, featuring a simple structure and smooth movement.

The hydraulic swing cylinder is widely used in a variety of heavy-duty machines and equipment, including:

• Excavators – controls boom or arm swing for digging and loading operations.
• Cranes – enables rotational positioning of the lifting structure.
• Mining and drilling machines – provides precise swing movement under harsh conditions.
• Construction equipment – ensures smooth turning and positioning of attachments.
• Forestry and agricultural machinery – supports hydraulic swing operations for implements and arms.
• Marine and offshore machinery – assists in movement control for ship cranes and platforms.
• Its ability to convert hydraulic power into controlled swinging movement makes it an indispensable part of modern hydraulic systems.

Quality Control and Testing

• Every cylinder undergoes strict inspection and hydraulic testing before delivery. Quality assurance includes:
• Hydraulic Pressure and leakage testing under rated loads
• Dimensional accuracy verification
• Coating adhesion and corrosion resistance testing
• Fatigue and endurance testing for long-term reliability
• All products comply with ISO, DIN, and CE standards, guaranteeing consistent performance and safety in demanding industrial environments.

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Why us?

We focus on the research, development, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders. We have a complete production chain and an advanced equipment system, including piercing machines, cold drawing machines, hot rolling machines, high-precision flaw detection and testing equipment. The company has passed multiple authoritative certifications such as ISO9001, API, SGS, CCS, DNV, ABS, CE, RoHS, etc., ensuring that each product complies with international standards. We are committed to providing customers with high-quality, customizable solutions to meet diverse application needs.

Relying on our own built processing base and modern workshops, combined with multiple branches and storage centers across the country, we have achieved sufficient inventory and efficient logistics coordination, significantly shortening the delivery cycle and ensuring the rapid delivery of orders.

We have established a complete service and support system. After the order is signed, the professional after-sales team can provide timely and safe on-site guidance and technical support to ensure that customers are at ease throughout the process from procurement to use.

FAQ:

1. Do you support customized design and production?

Sure. We have a professional engineering team that can conduct customized design and production with special sizes, control systems or OEM according to your requirements.

2. How fast can you deliver?

In stock sizes, it takes 3-5 days. For customized sizes, it takes 30-35 days.

3. What payment methods do you support?

We support TT payment. Generally, 30% to 50% of the payment is made in advance, and the remaining amount is paid before shipment.

4. Can you provide material certification (MTC)?

Yes, we will provide MTC to you after production is completed to ensure that the material quality meets the standards.

5. What is the minimum order quantity?

Generally, we accept trial orders. The minimum order quantity is 1-3 tons, which can be determined according to different products.