Product description:

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.

An Amplitude variation cylinder, also known as a boom amplitude cylinder or amplitude adjustment hydraulic cylinder, is a key hydraulic component used in construction machinery, cranes, concrete pumps, and engineering vehicles. It is primarily responsible for controlling the amplitude (angle and reach) of the machine’s working arm or boom, allowing precise adjustment of position, lifting height, and operational range.

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Structure and Working Principle

The amplitude variation cylinder is typically composed of a cylinder barrel, piston, piston rod, sealing system, guide rings, and mounting ends. When hydraulic oil is pumped into the cylinder under pressure, the piston moves linearly, extending or retracting the piston rod. This motion changes the boom’s angle or distance, effectively adjusting its amplitude.

In construction machinery such as concrete pump trucks or cranes, the amplitude variation cylinder plays a critical role in controlling boom movement, maintaining balance, and ensuring smooth operation during lifting, extending, or folding actions. The design allows for precise hydraulic control, high working pressure, and reliable performance in all types of field conditions.

Materials and Manufacturing Process

The cylinder barrel is made from high-strength alloy steel or precision seamless steel tubes, which are honed internally for low friction and high sealing performance. The piston rod is hard chrome plated or QPQ-treated, providing superior wear resistance and corrosion protection.

Advanced CNC machining, robotic welding, and heat treatment processes ensure high dimensional accuracy and excellent mechanical strength. The assembly of each amplitude variation cylinder follows strict quality control procedures to guarantee reliable sealing, smooth operation, and long service life even under continuous heavy loading and shock conditions.

Key Features and Advantages

Precise Amplitude Control: Allows accurate adjustment of boom or arm angle for improved positioning and operational flexibility.

High Pressure Resistance: Designed to operate under working pressures up to 35 MPa or higher for heavy-duty applications.

Superior Sealing Performance: Uses imported or high-quality seals (such as NOK, Hallite, or Parker) to ensure zero leakage and reliable operation.

Strong and Durable Construction: Built with heat-treated materials and advanced surface finishing to resist wear, corrosion, and fatigue.

Smooth and Stable Operation: Optimized hydraulic design reduces vibration, ensures consistent speed, and enhances precision control.

Customizable Design: Available in multiple bore sizes, stroke lengths, mounting styles, and connection types according to specific equipment needs.

Easy Maintenance: Modular design with replaceable seals and wear parts simplifies inspection and servicing.

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 amplitude variation cylinder is widely applied in:

Concrete pump trucks – to control the extension and folding of booms.

Truck cranes and tower cranes – to adjust boom amplitude and lifting angles.

Excavators and loaders – for controlling arm reach and digging range.

Mining and agricultural equipment – for movement and angle adjustment of heavy arms or implements.

Special engineering machinery – for systems requiring stable and accurate angular motion.

In all these applications, the cylinder provides precise control, powerful output, and long-term reliability, helping machinery achieve smooth and efficient performance.

Quality Control and Testing

Each amplitude variation cylinder undergoes strict quality inspection and hydraulic testing before leaving the factory. Quality checks include:

Hydraulic pressure and leakage testing

Dimensional and surface accuracy inspection

Coating adhesion and corrosion resistance testing

Fatigue and endurance testing under full load

All cylinders comply with ISO, DIN, and CE standards to ensure durability, reliability, and safety under extreme working conditions.

Company profile:

Since its establishment in 2014, Wuxi Hengxin Zhicheng Co., Ltd. has rapidly grown into a leading enterprise in the steel manufacturing industry. We focus on the research, production and sales of seamless steel pipes, special-shaped steel pipes and hydraulic cylinders, and are committed to providing customers with high-quality, customizable products that fully meet diverse application needs.

Our products are exported to global markets such as the Middle East, South America, Africa, and Southeast Asia, and are highly trusted by large purchasers and customers in the steel industry. We always prioritize quality, reliability and customer service, and attach great importance to establishing long-term and stable cooperative relationships with customers. We provide each customer with tailor-made solutions.

We continuously promote technological innovation and improve service capabilities and production efficiency. Through an efficient online platform, you can browse our best-selling products at any time and communicate with the sales and support teams in real time to conveniently obtain the information you need. We sincerely invite partners from all countries to visit, exchange and provide guidance, and jointly explore more possible cooperation opportunities!

Certification:

Packaging and Transportation:

【Package standard】

We use steel bands to tightly package the products into hexagonal bundles. The structure is stable and not prone to deformation. Each bundle is equipped with two high-strength nylon straps to ensure the safety and convenience of the lifting operation.

To meet various maritime transportation needs, we offer a range of customized packaging options, including full coverage with oilcloth, moisture-proof wooden boxes, and high-strength protective frame packaging, to ensure the maximum safety of goods during transportation.

【Guarantee for transportation】

We offer 20-foot and 40-foot standard container transportation services. Each container can carry up to 25 tons of goods and we can accept trial orders with a minimum of 5 tons. This allows for flexible adaptation to your purchasing scale. All packaging complies with maritime shipping standards to ensure that the goods are delivered to the destination efficiently and safely.

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.