Swing Cylinder
Product description:

A swing cylinder is an essential hydraulic component widely used in excavators, cranes, forestry equipment, and material handling machinery. It is designed to control the swing or rotation movement of machine parts, such as the upper structure of an excavator or the working arm of specialized machinery. By converting hydraulic energy into rotational or linear motion, the swing cylinder ensures precise and powerful movement control, allowing equipment to operate efficiently and safely under demanding conditions.

A Tightening oil cylinder, also known as a hydraulic tightening cylinder or hydraulic tensioning actuator, is a precision hydraulic component used to apply controlled axial force or tension in various mechanical systems. It is widely used in construction machinery, bridge equipment, steel structure assembly, wind power installations, shipbuilding, and industrial manufacturing.

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Structure and Working Principle

The swing cylinder consists of a cylinder barrel, piston, piston rod, seals, bearings, and mounting ends. When pressurized hydraulic oil flows into the cylinder chamber, it pushes the piston to move linearly. This motion is transmitted through a mechanical linkage or swing arm, producing a controlled rotation or swinging action.

The cylinder enables smooth, stable, and accurate control of swing angles — a critical function in excavators and other machinery that require precise positioning. Its robust construction and high-pressure design allow it to handle heavy loads, shock impacts, and continuous operation without compromising performance.
Materials and Manufacturing Process

The cylinder barrel is made from high-strength alloy steel, precision honed to achieve a smooth internal surface that minimizes seal wear and extends service life. The piston rod is hard chrome plated or QPQ-treated, providing excellent resistance to corrosion, abrasion, and impact.

Advanced CNC machining, robotic welding, and heat treatment processes are used to ensure perfect dimensional accuracy and mechanical strength. The entire production process follows strict quality standards to guarantee that each swing cylinder meets the highest performance and safety requirements.

All critical components — including seals, guide rings, and bearings — are carefully selected from trusted global brands to ensure maximum reliability in harsh operating environments.

Key Features and Advantages

• High Working Pressure: Capable of operating under pressures up to 35 MPa or more, ensuring strong torque output and stability.
• Precision Control: Provides smooth and accurate swing motion, improving equipment performance and operator control.
• Excellent Sealing System: Equipped with advanced seals from brands like NOK, Hallite, or Parker, preventing oil leakage and contamination.
• Durable and Reliable: Made from premium alloy steel with superior surface treatment to resist wear, corrosion, and fatigue.
• Customizable Design: Available in various bore sizes, stroke lengths, and mounting configurations to suit different equipment models.
• Easy Maintenance: Simple structure and replaceable components make inspection, repair, and seal replacement fast and convenient.

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.

Swing cylinders are widely used in various heavy machinery applications, including:

• Excavators and backhoes – to control the swing motion of the upper structure or boom arm.
• Cranes and loaders – for rotation and alignment of lifting arms or platforms.
• Forestry and agricultural machines – to power hydraulic swing arms and attachments.
• Marine and mining equipment – for directional control, rotation, or lifting operations.
• In each of these applications, the swing cylinder provides stable, controlled motion and ensures optimal machine performance even in extreme environments.

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.