Product description:

A telescopic cylinder, also known as a hydraulic telescopic cylinder or multi-stage hydraulic cylinder, is a specialized actuator designed to provide long stroke lengths from a compact retracted size. It is widely used in dump trucks, lifting equipment, cranes, agricultural machinery, and mobile hydraulic systems where space is limited but long extension is required.

The telescopic hydraulic cylinder allows controlled extension and retraction through multiple nested stages, enabling smooth, powerful, and efficient lifting or pushing actions. With superior load capacity and compact design, it is an ideal choice for heavy-duty lifting and dumping operations.

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 hydraulic telescopic cylinder consists of multiple tubular stages (also called sleeves or barrels) of progressively smaller diameters that extend sequentially under hydraulic pressure. Each stage is fitted with seals and bearing rings to ensure precise guidance and leak-free operation.

When hydraulic oil is introduced into the base of the cylinder, it pushes the largest stage outward first. As each stage reaches full extension, pressure is transferred to the next stage, creating a continuous and powerful extension movement. Retraction occurs in reverse order, with the smallest stage retracting first.

This multi-stage design provides a much longer stroke length compared to a single-stage cylinder, making it ideal for lifting applications with limited mounting space.

Materials and Manufacturing Process

The cylinder barrel is made from high-strength alloy steel or seamless Precision steel tubes to withstand high internal pressure and mechanical stress. Each stage is honed, polished, and hard chrome plated for superior wear and corrosion resistance.

The piston rods and end caps are CNC-machined for high precision, while all welds are robotically performed to ensure consistent quality. The sealing system, sourced from top brands like Parker, Hallite, or NOK, guarantees exceptional reliability and zero leakage under high pressure.

All telescopic cylinders are manufactured in accordance with ISO, DIN, and CE quality standards, ensuring long service life and safe operation in all working environments.

Key Features and Advantages

Compact Design with Long Stroke: Provides a long extension capability while maintaining a short retracted length.

• High Load Capacity: Engineered for heavy-duty applications such as dump trucks and cranes.
• Smooth and Sequential Extension: Ensures stable and controlled movement across all stages.
• Superior Sealing Performance: Premium seals ensure leak-free operation and long service life.
• Corrosion and Wear Resistance: Chrome-plated surfaces protect against environmental damage.
• Customizable Configurations: Available in single-acting or double-acting designs, with various mounting styles.
• Low Maintenance: Simple structure and reliable sealing minimize downtime.
• High Pressure Resistance: Capable of withstanding pressures up to 35 MPa or higher depending on design.

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 Telescopic Hydraulic Cylinder is widely applied in:

• Dump Trucks and Tippers: For lifting and lowering the truck bed during material unloading.
• Cranes and Lifting Equipment: Provides long stroke lifting in confined spaces.
• Garbage Trucks: Powers the compaction and ejection mechanisms.
• Agricultural Machinery: Used in hydraulic lifting systems for implements and trailers.
• Mining and Construction Equipment: Supports lifting, dumping, and adjustment functions.
• Marine and Offshore Equipment: Offers compact yet powerful actuation for limited-space operations.
• Aerial Work Platforms: Provides extended reach and stable lifting for personnel and tools.
• Its combination of strength, stability, and compactness makes the telescopic cylinder indispensable for modern hydraulic systems.

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.