Telescopic Cylinder
Product description:

A telescopic cylinder, also known as a multi-stage hydraulic cylinder, is a highly efficient hydraulic actuator designed to provide long stroke lengths while maintaining a compact retracted size. It is commonly used in dump trucks, lifting platforms, cranes, agricultural machinery, garbage trucks, and construction equipment where space is limited but a long extension range is required.

The telescopic cylinder converts hydraulic pressure into controlled linear motion, extending through multiple nested stages to achieve long stroke output. Its unique design allows for powerful lifting force, smooth operation, and reliable performance under heavy-duty conditions.

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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Structure and Working Principle

The telescopic hydraulic cylinder consists of several nested tubular stages—commonly 2 to 6 sections—each progressively smaller in diameter. These stages extend sequentially under hydraulic pressure and retract in reverse order under gravity or return pressure.

When hydraulic oil enters the cylinder, it pushes the piston of the largest stage first. Once it reaches full extension, the next smaller stage begins to extend, and so on. This design achieves a long working stroke within a compact retracted size, making telescopic cylinders ideal for applications with limited installation space.

A typical telescopic cylinder assembly includes:

• Cylinder barrels and pistons
• Piston rods and gland nuts
• High-performance sealing systems
• Hydraulic ports and mounting eyes
• The working mechanism ensures stable motion, high pressure resistance, and precise control throughout the extension and retraction cycles.

Material and Manufacturing Process

To ensure durability and efficiency, the cylinder body is made from high-strength alloy steel or precision cold-drawn seamless tubes. The piston rods are hard chrome plated or QPQ nitrided for superior wear resistance, corrosion protection, and smooth surface finish.

The inner surfaces are honed and polished to ensure excellent sealing performance and reduce internal friction. Advanced CNC machining, robotic welding, and precision assembly technologies guarantee high dimensional accuracy, long service life, and reliable operation even under continuous heavy load.

Each telescopic cylinder is produced according to ISO, DIN, and CE standards, ensuring consistent quality and performance in global markets.

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.

Telescopic cylinders are widely used in machinery requiring long-stroke movement or vertical lifting, including:

• Dump trucks and tippers: for lifting the cargo bed efficiently.
• Lifting and aerial platforms: for elevating work platforms and maintenance vehicles.
• Cranes and hoisting equipment: for extending booms and arms.
• Garbage compactors: for pushing and compressing waste materials.
• Agricultural and forestry machinery: for controlling implements and attachments.
• Mobile hydraulic systems: for compact and flexible motion solutions.
• In each application, the telescopic cylinder provides reliable, strong, and precise movement, contributing to improved productivity and operational safety.

Quality Control and Testing

Every cylinder undergoes strict inspection and hydraulic testing before delivery. Quality assurance includes:

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.